microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность

Merge branch 'for-4.5/drivers' of git://git.kernel.dk/linux-block 

Pull block driver updates from Jens Axboe:
 "This is the block driver pull request for 4.5, with the exception of
  NVMe, which is in a separate branch and will be posted after this one.

  This pull request contains:

   - A set of bcache stability fixes, which have been acked by Kent.
     These have been used and tested for more than a year by the
     community, so it's about time that they got in.

   - A set of drbd updates from the drbd team (Andreas, Lars, Philipp)
     and Markus Elfring, Oleg Drokin.

   - A set of fixes for xen blkback/front from the usual suspects, (Bob,
     Konrad) as well as community based fixes from Kiri, Julien, and
     Peng.

   - A 2038 time fix for sx8 from Shraddha, with a fix from me.

   - A small mtip32xx cleanup from Zhu Yanjun.

   - A null_blk division fix from Arnd"

* 'for-4.5/drivers' of git://git.kernel.dk/linux-block: (71 commits)
  null_blk: use sector_div instead of do_div
  mtip32xx: restrict variables visible in current code module
  xen/blkfront: Fix crash if backend doesn't follow the right states.
  xen/blkback: Fix two memory leaks.
  xen/blkback: make st_ statistics per ring
  xen/blkfront: Handle non-indirect grant with 64KB pages
  xen-blkfront: Introduce blkif_ring_get_request
  xen-blkback: clear PF_NOFREEZE for xen_blkif_schedule()
  xen/blkback: Free resources if connect_ring failed.
  xen/blocks: Return -EXX instead of -1
  xen/blkback: make pool of persistent grants and free pages per-queue
  xen/blkback: get the number of hardware queues/rings from blkfront
  xen/blkback: pseudo support for multi hardware queues/rings
  xen/blkback: separate ring information out of struct xen_blkif
  xen/blkfront: correct setting for xen_blkif_max_ring_order
  xen/blkfront: make persistent grants pool per-queue
  xen/blkfront: Remove duplicate setting of ->xbdev.
  xen/blkfront: Cleanup of comments, fix unaligned variables, and syntax errors.
  xen/blkfront: negotiate number of queues/rings to be used with backend
  xen/blkfront: split per device io_lock
  ...
This commit is contained in:
Linus Torvalds 2016-01-21 18:19:38 -08:00
Родитель 404a47410c e93d12ae3b
Коммит 641203549a
33 изменённых файлов: 3913 добавлений и 1346 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

11
MAINTAINERS
Просмотреть файл

@ -3665,13 +3665,12 @@ F: drivers/scsi/dpt*
F: drivers/scsi/dpt/
DRBD DRIVER
P: Philipp Reisner
P: Lars Ellenberg
M: drbd-dev@lists.linbit.com
L: drbd-user@lists.linbit.com
M: Philipp Reisner <philipp.reisner@linbit.com>
M: Lars Ellenberg <lars.ellenberg@linbit.com>
L: drbd-dev@lists.linbit.com
W: http://www.drbd.org
T: git git://git.drbd.org/linux-2.6-drbd.git drbd
T: git git://git.drbd.org/drbd-8.3.git
T: git git://git.linbit.com/linux-drbd.git
T: git git://git.linbit.com/drbd-8.4.git
S: Supported
F: drivers/block/drbd/
F: lib/lru_cache.c

323
drivers/block/drbd/drbd_actlog.c
Просмотреть файл

@ -288,7 +288,162 @@ bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *
return need_transaction;
}
static int al_write_transaction(struct drbd_device *device);
#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)
/* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT
* are still coupled, or assume too much about their relation.
* Code below will not work if this is violated.
* Will be cleaned up with some followup patch.
*/
# error FIXME
#endif
static unsigned int al_extent_to_bm_page(unsigned int al_enr)
{
return al_enr >>
/* bit to page */
((PAGE_SHIFT + 3) -
/* al extent number to bit */
(AL_EXTENT_SHIFT - BM_BLOCK_SHIFT));
}
static sector_t al_tr_number_to_on_disk_sector(struct drbd_device *device)
{
const unsigned int stripes = device->ldev->md.al_stripes;
const unsigned int stripe_size_4kB = device->ldev->md.al_stripe_size_4k;
/* transaction number, modulo on-disk ring buffer wrap around */
unsigned int t = device->al_tr_number % (device->ldev->md.al_size_4k);
/* ... to aligned 4k on disk block */
t = ((t % stripes) * stripe_size_4kB) + t/stripes;
/* ... to 512 byte sector in activity log */
t *= 8;
/* ... plus offset to the on disk position */
return device->ldev->md.md_offset + device->ldev->md.al_offset + t;
}
static int __al_write_transaction(struct drbd_device *device, struct al_transaction_on_disk *buffer)
{
struct lc_element *e;
sector_t sector;
int i, mx;
unsigned extent_nr;
unsigned crc = 0;
int err = 0;
memset(buffer, 0, sizeof(*buffer));
buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
buffer->tr_number = cpu_to_be32(device->al_tr_number);
i = 0;
/* Even though no one can start to change this list
* once we set the LC_LOCKED -- from drbd_al_begin_io(),
* lc_try_lock_for_transaction() --, someone may still
* be in the process of changing it. */
spin_lock_irq(&device->al_lock);
list_for_each_entry(e, &device->act_log->to_be_changed, list) {
if (i == AL_UPDATES_PER_TRANSACTION) {
i++;
break;
}
buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index);
buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number);
if (e->lc_number != LC_FREE)
drbd_bm_mark_for_writeout(device,
al_extent_to_bm_page(e->lc_number));
i++;
}
spin_unlock_irq(&device->al_lock);
BUG_ON(i > AL_UPDATES_PER_TRANSACTION);
buffer->n_updates = cpu_to_be16(i);
for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) {
buffer->update_slot_nr[i] = cpu_to_be16(-1);
buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE);
}
buffer->context_size = cpu_to_be16(device->act_log->nr_elements);
buffer->context_start_slot_nr = cpu_to_be16(device->al_tr_cycle);
mx = min_t(int, AL_CONTEXT_PER_TRANSACTION,
device->act_log->nr_elements - device->al_tr_cycle);
for (i = 0; i < mx; i++) {
unsigned idx = device->al_tr_cycle + i;
extent_nr = lc_element_by_index(device->act_log, idx)->lc_number;
buffer->context[i] = cpu_to_be32(extent_nr);
}
for (; i < AL_CONTEXT_PER_TRANSACTION; i++)
buffer->context[i] = cpu_to_be32(LC_FREE);
device->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION;
if (device->al_tr_cycle >= device->act_log->nr_elements)
device->al_tr_cycle = 0;
sector = al_tr_number_to_on_disk_sector(device);
crc = crc32c(0, buffer, 4096);
buffer->crc32c = cpu_to_be32(crc);
if (drbd_bm_write_hinted(device))
err = -EIO;
else {
bool write_al_updates;
rcu_read_lock();
write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates;
rcu_read_unlock();
if (write_al_updates) {
if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) {
err = -EIO;
drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
} else {
device->al_tr_number++;
device->al_writ_cnt++;
}
}
}
return err;
}
static int al_write_transaction(struct drbd_device *device)
{
struct al_transaction_on_disk *buffer;
int err;
if (!get_ldev(device)) {
drbd_err(device, "disk is %s, cannot start al transaction\n",
drbd_disk_str(device->state.disk));
return -EIO;
}
/* The bitmap write may have failed, causing a state change. */
if (device->state.disk < D_INCONSISTENT) {
drbd_err(device,
"disk is %s, cannot write al transaction\n",
drbd_disk_str(device->state.disk));
put_ldev(device);
return -EIO;
}
/* protects md_io_buffer, al_tr_cycle, ... */
buffer = drbd_md_get_buffer(device, __func__);
if (!buffer) {
drbd_err(device, "disk failed while waiting for md_io buffer\n");
put_ldev(device);
return -ENODEV;
}
err = __al_write_transaction(device, buffer);
drbd_md_put_buffer(device);
put_ldev(device);
return err;
}
void drbd_al_begin_io_commit(struct drbd_device *device)
{
@ -420,153 +575,6 @@ void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i)
wake_up(&device->al_wait);
}
#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)
/* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT
* are still coupled, or assume too much about their relation.
* Code below will not work if this is violated.
* Will be cleaned up with some followup patch.
*/
# error FIXME
#endif
static unsigned int al_extent_to_bm_page(unsigned int al_enr)
{
return al_enr >>
/* bit to page */
((PAGE_SHIFT + 3) -
/* al extent number to bit */
(AL_EXTENT_SHIFT - BM_BLOCK_SHIFT));
}
static sector_t al_tr_number_to_on_disk_sector(struct drbd_device *device)
{
const unsigned int stripes = device->ldev->md.al_stripes;
const unsigned int stripe_size_4kB = device->ldev->md.al_stripe_size_4k;
/* transaction number, modulo on-disk ring buffer wrap around */
unsigned int t = device->al_tr_number % (device->ldev->md.al_size_4k);
/* ... to aligned 4k on disk block */
t = ((t % stripes) * stripe_size_4kB) + t/stripes;
/* ... to 512 byte sector in activity log */
t *= 8;
/* ... plus offset to the on disk position */
return device->ldev->md.md_offset + device->ldev->md.al_offset + t;
}
int al_write_transaction(struct drbd_device *device)
{
struct al_transaction_on_disk *buffer;
struct lc_element *e;
sector_t sector;
int i, mx;
unsigned extent_nr;
unsigned crc = 0;
int err = 0;
if (!get_ldev(device)) {
drbd_err(device, "disk is %s, cannot start al transaction\n",
drbd_disk_str(device->state.disk));
return -EIO;
}
/* The bitmap write may have failed, causing a state change. */
if (device->state.disk < D_INCONSISTENT) {
drbd_err(device,
"disk is %s, cannot write al transaction\n",
drbd_disk_str(device->state.disk));
put_ldev(device);
return -EIO;
}
/* protects md_io_buffer, al_tr_cycle, ... */
buffer = drbd_md_get_buffer(device, __func__);
if (!buffer) {
drbd_err(device, "disk failed while waiting for md_io buffer\n");
put_ldev(device);
return -ENODEV;
}
memset(buffer, 0, sizeof(*buffer));
buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
buffer->tr_number = cpu_to_be32(device->al_tr_number);
i = 0;
/* Even though no one can start to change this list
* once we set the LC_LOCKED -- from drbd_al_begin_io(),
* lc_try_lock_for_transaction() --, someone may still
* be in the process of changing it. */
spin_lock_irq(&device->al_lock);
list_for_each_entry(e, &device->act_log->to_be_changed, list) {
if (i == AL_UPDATES_PER_TRANSACTION) {
i++;
break;
}
buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index);
buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number);
if (e->lc_number != LC_FREE)
drbd_bm_mark_for_writeout(device,
al_extent_to_bm_page(e->lc_number));
i++;
}
spin_unlock_irq(&device->al_lock);
BUG_ON(i > AL_UPDATES_PER_TRANSACTION);
buffer->n_updates = cpu_to_be16(i);
for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) {
buffer->update_slot_nr[i] = cpu_to_be16(-1);
buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE);
}
buffer->context_size = cpu_to_be16(device->act_log->nr_elements);
buffer->context_start_slot_nr = cpu_to_be16(device->al_tr_cycle);
mx = min_t(int, AL_CONTEXT_PER_TRANSACTION,
device->act_log->nr_elements - device->al_tr_cycle);
for (i = 0; i < mx; i++) {
unsigned idx = device->al_tr_cycle + i;
extent_nr = lc_element_by_index(device->act_log, idx)->lc_number;
buffer->context[i] = cpu_to_be32(extent_nr);
}
for (; i < AL_CONTEXT_PER_TRANSACTION; i++)
buffer->context[i] = cpu_to_be32(LC_FREE);
device->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION;
if (device->al_tr_cycle >= device->act_log->nr_elements)
device->al_tr_cycle = 0;
sector = al_tr_number_to_on_disk_sector(device);
crc = crc32c(0, buffer, 4096);
buffer->crc32c = cpu_to_be32(crc);
if (drbd_bm_write_hinted(device))
err = -EIO;
else {
bool write_al_updates;
rcu_read_lock();
write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates;
rcu_read_unlock();
if (write_al_updates) {
if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) {
err = -EIO;
drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
} else {
device->al_tr_number++;
device->al_writ_cnt++;
}
}
}
drbd_md_put_buffer(device);
put_ldev(device);
return err;
}
static int _try_lc_del(struct drbd_device *device, struct lc_element *al_ext)
{
int rv;
@ -606,21 +614,24 @@ void drbd_al_shrink(struct drbd_device *device)
wake_up(&device->al_wait);
}
int drbd_initialize_al(struct drbd_device *device, void *buffer)
int drbd_al_initialize(struct drbd_device *device, void *buffer)
{
struct al_transaction_on_disk *al = buffer;
struct drbd_md *md = &device->ldev->md;
sector_t al_base = md->md_offset + md->al_offset;
int al_size_4k = md->al_stripes * md->al_stripe_size_4k;
int i;
memset(al, 0, 4096);
al->magic = cpu_to_be32(DRBD_AL_MAGIC);
al->transaction_type = cpu_to_be16(AL_TR_INITIALIZED);
al->crc32c = cpu_to_be32(crc32c(0, al, 4096));
__al_write_transaction(device, al);
/* There may or may not have been a pending transaction. */
spin_lock_irq(&device->al_lock);
lc_committed(device->act_log);
spin_unlock_irq(&device->al_lock);
for (i = 0; i < al_size_4k; i++) {
int err = drbd_md_sync_page_io(device, device->ldev, al_base + i * 8, WRITE);
/* The rest of the transactions will have an empty "updates" list, and
* are written out only to provide the context, and to initialize the
* on-disk ring buffer. */
for (i = 1; i < al_size_4k; i++) {
int err = __al_write_transaction(device, al);
if (err)
return err;
}

22
drivers/block/drbd/drbd_bitmap.c
Просмотреть файл

@ -24,7 +24,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitops.h>
#include <linux/bitmap.h>
#include <linux/vmalloc.h>
#include <linux/string.h>
#include <linux/drbd.h>
@ -479,8 +479,14 @@ void drbd_bm_cleanup(struct drbd_device *device)
* this masks out the remaining bits.
* Returns the number of bits cleared.
*/
#ifndef BITS_PER_PAGE
#define BITS_PER_PAGE (1UL << (PAGE_SHIFT + 3))
#define BITS_PER_PAGE_MASK (BITS_PER_PAGE - 1)
#else
# if BITS_PER_PAGE != (1UL << (PAGE_SHIFT + 3))
# error "ambiguous BITS_PER_PAGE"
# endif
#endif
#define BITS_PER_LONG_MASK (BITS_PER_LONG - 1)
static int bm_clear_surplus(struct drbd_bitmap *b)
{
@ -559,21 +565,19 @@ static unsigned long bm_count_bits(struct drbd_bitmap *b)
unsigned long *p_addr;
unsigned long bits = 0;
unsigned long mask = (1UL << (b->bm_bits & BITS_PER_LONG_MASK)) -1;
int idx, i, last_word;
int idx, last_word;
/* all but last page */
for (idx = 0; idx < b->bm_number_of_pages - 1; idx++) {
p_addr = __bm_map_pidx(b, idx);
for (i = 0; i < LWPP; i++)
bits += hweight_long(p_addr[i]);
bits += bitmap_weight(p_addr, BITS_PER_PAGE);
__bm_unmap(p_addr);
cond_resched();
}
/* last (or only) page */
last_word = ((b->bm_bits - 1) & BITS_PER_PAGE_MASK) >> LN2_BPL;
p_addr = __bm_map_pidx(b, idx);
for (i = 0; i < last_word; i++)
bits += hweight_long(p_addr[i]);
bits += bitmap_weight(p_addr, last_word * BITS_PER_LONG);
p_addr[last_word] &= cpu_to_lel(mask);
bits += hweight_long(p_addr[last_word]);
/* 32bit arch, may have an unused padding long */
@ -1419,6 +1423,9 @@ static inline void bm_set_full_words_within_one_page(struct drbd_bitmap *b,
int bits;
int changed = 0;
unsigned long *paddr = kmap_atomic(b->bm_pages[page_nr]);
/* I think it is more cache line friendly to hweight_long then set to ~0UL,
* than to first bitmap_weight() all words, then bitmap_fill() all words */
for (i = first_word; i < last_word; i++) {
bits = hweight_long(paddr[i]);
paddr[i] = ~0UL;
@ -1628,8 +1635,7 @@ int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr)
int n = e-s;
p_addr = bm_map_pidx(b, bm_word_to_page_idx(b, s));
bm = p_addr + MLPP(s);
while (n--)
count += hweight_long(*bm++);
count += bitmap_weight(bm, n * BITS_PER_LONG);
bm_unmap(p_addr);
} else {
drbd_err(device, "start offset (%d) too large in drbd_bm_e_weight\n", s);

10
drivers/block/drbd/drbd_debugfs.c
Просмотреть файл

@ -771,6 +771,13 @@ static int device_data_gen_id_show(struct seq_file *m, void *ignored)
return 0;
}
static int device_ed_gen_id_show(struct seq_file *m, void *ignored)
{
struct drbd_device *device = m->private;
seq_printf(m, "0x%016llX\n", (unsigned long long)device->ed_uuid);
return 0;
}
#define drbd_debugfs_device_attr(name) \
static int device_ ## name ## _open(struct inode *inode, struct file *file) \
{ \
@ -796,6 +803,7 @@ drbd_debugfs_device_attr(oldest_requests)
drbd_debugfs_device_attr(act_log_extents)
drbd_debugfs_device_attr(resync_extents)
drbd_debugfs_device_attr(data_gen_id)
drbd_debugfs_device_attr(ed_gen_id)
void drbd_debugfs_device_add(struct drbd_device *device)
{
@ -839,6 +847,7 @@ void drbd_debugfs_device_add(struct drbd_device *device)
DCF(act_log_extents);
DCF(resync_extents);
DCF(data_gen_id);
DCF(ed_gen_id);
#undef DCF
return;
@ -854,6 +863,7 @@ void drbd_debugfs_device_cleanup(struct drbd_device *device)
drbd_debugfs_remove(&device->debugfs_vol_act_log_extents);
drbd_debugfs_remove(&device->debugfs_vol_resync_extents);
drbd_debugfs_remove(&device->debugfs_vol_data_gen_id);
drbd_debugfs_remove(&device->debugfs_vol_ed_gen_id);
drbd_debugfs_remove(&device->debugfs_vol);
}

111
drivers/block/drbd/drbd_int.h
Просмотреть файл

@ -77,13 +77,6 @@ extern int fault_devs;
extern char usermode_helper[];
/* I don't remember why XCPU ...
* This is used to wake the asender,
* and to interrupt sending the sending task
* on disconnect.
*/
#define DRBD_SIG SIGXCPU
/* This is used to stop/restart our threads.
* Cannot use SIGTERM nor SIGKILL, since these
* are sent out by init on runlevel changes
@ -292,6 +285,9 @@ struct drbd_device_work {
extern int drbd_wait_misc(struct drbd_device *, struct drbd_interval *);
extern void lock_all_resources(void);
extern void unlock_all_resources(void);
struct drbd_request {
struct drbd_work w;
struct drbd_device *device;
@ -504,7 +500,6 @@ enum {
MD_NO_FUA, /* Users wants us to not use FUA/FLUSH on meta data dev */
SUSPEND_IO, /* suspend application io */
BITMAP_IO, /* suspend application io;
once no more io in flight, start bitmap io */
BITMAP_IO_QUEUED, /* Started bitmap IO */
@ -632,12 +627,6 @@ struct bm_io_work {
void (*done)(struct drbd_device *device, int rv);
};
enum write_ordering_e {
WO_none,
WO_drain_io,
WO_bdev_flush,
};
struct fifo_buffer {
unsigned int head_index;
unsigned int size;
@ -650,8 +639,7 @@ extern struct fifo_buffer *fifo_alloc(int fifo_size);
enum {
NET_CONGESTED, /* The data socket is congested */
RESOLVE_CONFLICTS, /* Set on one node, cleared on the peer! */
SEND_PING, /* whether asender should send a ping asap */
SIGNAL_ASENDER, /* whether asender wants to be interrupted */
SEND_PING,
GOT_PING_ACK, /* set when we receive a ping_ack packet, ping_wait gets woken */
CONN_WD_ST_CHG_REQ, /* A cluster wide state change on the connection is active */
CONN_WD_ST_CHG_OKAY,
@ -670,6 +658,8 @@ enum {
DEVICE_WORK_PENDING, /* tell worker that some device has pending work */
};
enum which_state { NOW, OLD = NOW, NEW };
struct drbd_resource {
char *name;
#ifdef CONFIG_DEBUG_FS
@ -755,7 +745,8 @@ struct drbd_connection {
unsigned long last_reconnect_jif;
struct drbd_thread receiver;
struct drbd_thread worker;
struct drbd_thread asender;
struct drbd_thread ack_receiver;
struct workqueue_struct *ack_sender;
/* cached pointers,
* so we can look up the oldest pending requests more quickly.
@ -774,6 +765,8 @@ struct drbd_connection {
struct drbd_thread_timing_details r_timing_details[DRBD_THREAD_DETAILS_HIST];
struct {
unsigned long last_sent_barrier_jif;
/* whether this sender thread
* has processed a single write yet. */
bool seen_any_write_yet;
@ -788,6 +781,17 @@ struct drbd_connection {
} send;
};
static inline bool has_net_conf(struct drbd_connection *connection)
{
bool has_net_conf;
rcu_read_lock();
has_net_conf = rcu_dereference(connection->net_conf);
rcu_read_unlock();
return has_net_conf;
}
void __update_timing_details(
struct drbd_thread_timing_details *tdp,
unsigned int *cb_nr,
@ -811,6 +815,7 @@ struct drbd_peer_device {
struct list_head peer_devices;
struct drbd_device *device;
struct drbd_connection *connection;
struct work_struct send_acks_work;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_peer_dev;
#endif
@ -829,6 +834,7 @@ struct drbd_device {
struct dentry *debugfs_vol_act_log_extents;
struct dentry *debugfs_vol_resync_extents;
struct dentry *debugfs_vol_data_gen_id;
struct dentry *debugfs_vol_ed_gen_id;
#endif
unsigned int vnr; /* volume number within the connection */
@ -873,6 +879,7 @@ struct drbd_device {
atomic_t rs_pending_cnt; /* RS request/data packets on the wire */
atomic_t unacked_cnt; /* Need to send replies for */
atomic_t local_cnt; /* Waiting for local completion */
atomic_t suspend_cnt;
/* Interval tree of pending local requests */
struct rb_root read_requests;
@ -1020,6 +1027,12 @@ static inline struct drbd_peer_device *first_peer_device(struct drbd_device *dev
return list_first_entry_or_null(&device->peer_devices, struct drbd_peer_device, peer_devices);
}
static inline struct drbd_peer_device *
conn_peer_device(struct drbd_connection *connection, int volume_number)
{
return idr_find(&connection->peer_devices, volume_number);
}
#define for_each_resource(resource, _resources) \
list_for_each_entry(resource, _resources, resources)
@ -1113,7 +1126,7 @@ extern int drbd_send_ov_request(struct drbd_peer_device *, sector_t sector, int
extern int drbd_send_bitmap(struct drbd_device *device);
extern void drbd_send_sr_reply(struct drbd_peer_device *, enum drbd_state_rv retcode);
extern void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode);
extern void drbd_free_ldev(struct drbd_backing_dev *ldev);
extern void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev);
extern void drbd_device_cleanup(struct drbd_device *device);
void drbd_print_uuids(struct drbd_device *device, const char *text);
@ -1424,7 +1437,7 @@ extern struct bio_set *drbd_md_io_bio_set;
/* to allocate from that set */
extern struct bio *bio_alloc_drbd(gfp_t gfp_mask);
extern rwlock_t global_state_lock;
extern struct mutex resources_mutex;
extern int conn_lowest_minor(struct drbd_connection *connection);
extern enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor);
@ -1454,6 +1467,9 @@ extern int is_valid_ar_handle(struct drbd_request *, sector_t);
/* drbd_nl.c */
extern struct mutex notification_mutex;
extern void drbd_suspend_io(struct drbd_device *device);
extern void drbd_resume_io(struct drbd_device *device);
extern char *ppsize(char *buf, unsigned long long size);
@ -1536,7 +1552,9 @@ extern void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req);
/* drbd_receiver.c */
extern int drbd_receiver(struct drbd_thread *thi);
extern int drbd_asender(struct drbd_thread *thi);
extern int drbd_ack_receiver(struct drbd_thread *thi);
extern void drbd_send_ping_wf(struct work_struct *ws);
extern void drbd_send_acks_wf(struct work_struct *ws);
extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device);
extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector,
bool throttle_if_app_is_waiting);
@ -1649,7 +1667,7 @@ extern int __drbd_change_sync(struct drbd_device *device, sector_t sector, int s
#define drbd_rs_failed_io(device, sector, size) \
__drbd_change_sync(device, sector, size, RECORD_RS_FAILED)
extern void drbd_al_shrink(struct drbd_device *device);
extern int drbd_initialize_al(struct drbd_device *, void *);
extern int drbd_al_initialize(struct drbd_device *, void *);
/* drbd_nl.c */
/* state info broadcast */
@ -1668,6 +1686,29 @@ struct sib_info {
};
void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib);
extern void notify_resource_state(struct sk_buff *,
unsigned int,
struct drbd_resource *,
struct resource_info *,
enum drbd_notification_type);
extern void notify_device_state(struct sk_buff *,
unsigned int,
struct drbd_device *,
struct device_info *,
enum drbd_notification_type);
extern void notify_connection_state(struct sk_buff *,
unsigned int,
struct drbd_connection *,
struct connection_info *,
enum drbd_notification_type);
extern void notify_peer_device_state(struct sk_buff *,
unsigned int,
struct drbd_peer_device *,
struct peer_device_info *,
enum drbd_notification_type);
extern void notify_helper(enum drbd_notification_type, struct drbd_device *,
struct drbd_connection *, const char *, int);
/*
* inline helper functions
*************************/
@ -1694,19 +1735,6 @@ static inline int drbd_peer_req_has_active_page(struct drbd_peer_request *peer_r
return 0;
}
static inline enum drbd_state_rv
_drbd_set_state(struct drbd_device *device, union drbd_state ns,
enum chg_state_flags flags, struct completion *done)
{
enum drbd_state_rv rv;
read_lock(&global_state_lock);
rv = __drbd_set_state(device, ns, flags, done);
read_unlock(&global_state_lock);
return rv;
}
static inline union drbd_state drbd_read_state(struct drbd_device *device)
{
struct drbd_resource *resource = device->resource;
@ -1937,16 +1965,21 @@ drbd_device_post_work(struct drbd_device *device, int work_bit)
extern void drbd_flush_workqueue(struct drbd_work_queue *work_queue);
static inline void wake_asender(struct drbd_connection *connection)
/* To get the ack_receiver out of the blocking network stack,
* so it can change its sk_rcvtimeo from idle- to ping-timeout,
* and send a ping, we need to send a signal.
* Which signal we send is irrelevant. */
static inline void wake_ack_receiver(struct drbd_connection *connection)
{
if (test_bit(SIGNAL_ASENDER, &connection->flags))
force_sig(DRBD_SIG, connection->asender.task);
struct task_struct *task = connection->ack_receiver.task;
if (task && get_t_state(&connection->ack_receiver) == RUNNING)
force_sig(SIGXCPU, task);
}
static inline void request_ping(struct drbd_connection *connection)
{
set_bit(SEND_PING, &connection->flags);
wake_asender(connection);
wake_ack_receiver(connection);
}
extern void *conn_prepare_command(struct drbd_connection *, struct drbd_socket *);
@ -2230,7 +2263,7 @@ static inline bool may_inc_ap_bio(struct drbd_device *device)
if (drbd_suspended(device))
return false;
if (test_bit(SUSPEND_IO, &device->flags))
if (atomic_read(&device->suspend_cnt))
return false;
/* to avoid potential deadlock or bitmap corruption,

74
drivers/block/drbd/drbd_main.c
Просмотреть файл

@ -117,6 +117,7 @@ module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0
*/
struct idr drbd_devices;
struct list_head drbd_resources;
struct mutex resources_mutex;
struct kmem_cache *drbd_request_cache;
struct kmem_cache *drbd_ee_cache; /* peer requests */
@ -1435,8 +1436,8 @@ static int we_should_drop_the_connection(struct drbd_connection *connection, str
/* long elapsed = (long)(jiffies - device->last_received); */
drop_it = connection->meta.socket == sock
|| !connection->asender.task
|| get_t_state(&connection->asender) != RUNNING
|| !connection->ack_receiver.task
|| get_t_state(&connection->ack_receiver) != RUNNING
|| connection->cstate < C_WF_REPORT_PARAMS;
if (drop_it)
@ -1793,15 +1794,6 @@ int drbd_send(struct drbd_connection *connection, struct socket *sock,
drbd_update_congested(connection);
}
do {
/* STRANGE
* tcp_sendmsg does _not_ use its size parameter at all ?
*
* -EAGAIN on timeout, -EINTR on signal.
*/
/* THINK
* do we need to block DRBD_SIG if sock == &meta.socket ??
* otherwise wake_asender() might interrupt some send_*Ack !
*/
rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
if (rv == -EAGAIN) {
if (we_should_drop_the_connection(connection, sock))
@ -2000,7 +1992,7 @@ void drbd_device_cleanup(struct drbd_device *device)
drbd_bm_cleanup(device);
}
drbd_free_ldev(device->ldev);
drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
clear_bit(AL_SUSPENDED, &device->flags);
@ -2179,7 +2171,7 @@ void drbd_destroy_device(struct kref *kref)
if (device->this_bdev)
bdput(device->this_bdev);
drbd_free_ldev(device->ldev);
drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
drbd_release_all_peer_reqs(device);
@ -2563,7 +2555,7 @@ int set_resource_options(struct drbd_resource *resource, struct res_opts *res_op
cpumask_copy(resource->cpu_mask, new_cpu_mask);
for_each_connection_rcu(connection, resource) {
connection->receiver.reset_cpu_mask = 1;
connection->asender.reset_cpu_mask = 1;
connection->ack_receiver.reset_cpu_mask = 1;
connection->worker.reset_cpu_mask = 1;
}
}
@ -2590,7 +2582,7 @@ struct drbd_resource *drbd_create_resource(const char *name)
kref_init(&resource->kref);
idr_init(&resource->devices);
INIT_LIST_HEAD(&resource->connections);
resource->write_ordering = WO_bdev_flush;
resource->write_ordering = WO_BDEV_FLUSH;
list_add_tail_rcu(&resource->resources, &drbd_resources);
mutex_init(&resource->conf_update);
mutex_init(&resource->adm_mutex);
@ -2652,8 +2644,8 @@ struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
connection->receiver.connection = connection;
drbd_thread_init(resource, &connection->worker, drbd_worker, "worker");
connection->worker.connection = connection;
drbd_thread_init(resource, &connection->asender, drbd_asender, "asender");
connection->asender.connection = connection;
drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv");
connection->ack_receiver.connection = connection;
kref_init(&connection->kref);
@ -2702,8 +2694,8 @@ static int init_submitter(struct drbd_device *device)
{
/* opencoded create_singlethread_workqueue(),
* to be able to say "drbd%d", ..., minor */
device->submit.wq = alloc_workqueue("drbd%u_submit",
WQ_UNBOUND | WQ_MEM_RECLAIM, 1, device->minor);
device->submit.wq =
alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor);
if (!device->submit.wq)
return -ENOMEM;
@ -2820,6 +2812,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
goto out_idr_remove_from_resource;
}
kref_get(&connection->kref);
INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf);
}
if (init_submitter(device)) {
@ -2923,7 +2916,7 @@ static int __init drbd_init(void)
drbd_proc = NULL; /* play safe for drbd_cleanup */
idr_init(&drbd_devices);
rwlock_init(&global_state_lock);
mutex_init(&resources_mutex);
INIT_LIST_HEAD(&drbd_resources);
err = drbd_genl_register();
@ -2971,18 +2964,6 @@ fail:
return err;
}
void drbd_free_ldev(struct drbd_backing_dev *ldev)
{
if (ldev == NULL)
return;
blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
kfree(ldev->disk_conf);
kfree(ldev);
}
static void drbd_free_one_sock(struct drbd_socket *ds)
{
struct socket *s;
@ -3277,6 +3258,10 @@ int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
* and read it. */
bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
bdev->md.md_offset = drbd_md_ss(bdev);
/* Even for (flexible or indexed) external meta data,
* initially restrict us to the 4k superblock for now.
* Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */
bdev->md.md_size_sect = 8;
if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset, READ)) {
/* NOTE: can't do normal error processing here as this is
@ -3578,7 +3563,9 @@ void drbd_queue_bitmap_io(struct drbd_device *device,
spin_lock_irq(&device->resource->req_lock);
set_bit(BITMAP_IO, &device->flags);
if (atomic_read(&device->ap_bio_cnt) == 0) {
/* don't wait for pending application IO if the caller indicates that
* application IO does not conflict anyways. */
if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) {
if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
drbd_queue_work(&first_peer_device(device)->connection->sender_work,
&device->bm_io_work.w);
@ -3746,6 +3733,27 @@ int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i)
return 0;
}
void lock_all_resources(void)
{
struct drbd_resource *resource;
int __maybe_unused i = 0;
mutex_lock(&resources_mutex);
local_irq_disable();
for_each_resource(resource, &drbd_resources)
spin_lock_nested(&resource->req_lock, i++);
}
void unlock_all_resources(void)
{
struct drbd_resource *resource;
for_each_resource(resource, &drbd_resources)
spin_unlock(&resource->req_lock);
local_irq_enable();
mutex_unlock(&resources_mutex);
}
#ifdef CONFIG_DRBD_FAULT_INJECTION
/* Fault insertion support including random number generator shamelessly
* stolen from kernel/rcutorture.c */

1361
drivers/block/drbd/drbd_nl.c
Просмотреть файл

Разница между файлами не показана из-за своего большого размера Загрузить разницу

6
drivers/block/drbd/drbd_proc.c
Просмотреть файл

@ -245,9 +245,9 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
char wp;
static char write_ordering_chars[] = {
[WO_none] = 'n',
[WO_drain_io] = 'd',
[WO_bdev_flush] = 'f',
[WO_NONE] = 'n',
[WO_DRAIN_IO] = 'd',
[WO_BDEV_FLUSH] = 'f',
};
seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",

2
drivers/block/drbd/drbd_protocol.h
Просмотреть файл

@ -23,7 +23,7 @@ enum drbd_packet {
P_AUTH_RESPONSE = 0x11,
P_STATE_CHG_REQ = 0x12,
/* asender (meta socket */
/* (meta socket) */
P_PING = 0x13,
P_PING_ACK = 0x14,
P_RECV_ACK = 0x15, /* Used in protocol B */

262
drivers/block/drbd/drbd_receiver.c
Просмотреть файл

@ -215,7 +215,7 @@ static void reclaim_finished_net_peer_reqs(struct drbd_device *device,
}
}
static void drbd_kick_lo_and_reclaim_net(struct drbd_device *device)
static void drbd_reclaim_net_peer_reqs(struct drbd_device *device)
{
LIST_HEAD(reclaimed);
struct drbd_peer_request *peer_req, *t;
@ -223,11 +223,30 @@ static void drbd_kick_lo_and_reclaim_net(struct drbd_device *device)
spin_lock_irq(&device->resource->req_lock);
reclaim_finished_net_peer_reqs(device, &reclaimed);
spin_unlock_irq(&device->resource->req_lock);
list_for_each_entry_safe(peer_req, t, &reclaimed, w.list)
drbd_free_net_peer_req(device, peer_req);
}
static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection)
{
struct drbd_peer_device *peer_device;
int vnr;
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
if (!atomic_read(&device->pp_in_use_by_net))
continue;
kref_get(&device->kref);
rcu_read_unlock();
drbd_reclaim_net_peer_reqs(device);
kref_put(&device->kref, drbd_destroy_device);
rcu_read_lock();
}
rcu_read_unlock();
}
/**
* drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled)
* @device: DRBD device.
@ -265,10 +284,15 @@ struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int
if (atomic_read(&device->pp_in_use) < mxb)
page = __drbd_alloc_pages(device, number);
/* Try to keep the fast path fast, but occasionally we need
* to reclaim the pages we lended to the network stack. */
if (page && atomic_read(&device->pp_in_use_by_net) > 512)
drbd_reclaim_net_peer_reqs(device);
while (page == NULL) {
prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
drbd_kick_lo_and_reclaim_net(device);
drbd_reclaim_net_peer_reqs(device);
if (atomic_read(&device->pp_in_use) < mxb) {
page = __drbd_alloc_pages(device, number);
@ -1099,7 +1123,15 @@ randomize:
return 0;
}
drbd_thread_start(&connection->asender);
drbd_thread_start(&connection->ack_receiver);
/* opencoded create_singlethread_workqueue(),
* to be able to use format string arguments */
connection->ack_sender =
alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name);
if (!connection->ack_sender) {
drbd_err(connection, "Failed to create workqueue ack_sender\n");
return 0;
}
mutex_lock(&connection->resource->conf_update);
/* The discard_my_data flag is a single-shot modifier to the next
@ -1178,7 +1210,7 @@ static void drbd_flush(struct drbd_connection *connection)
struct drbd_peer_device *peer_device;
int vnr;
if (connection->resource->write_ordering >= WO_bdev_flush) {
if (connection->resource->write_ordering >= WO_BDEV_FLUSH) {
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
@ -1203,7 +1235,7 @@ static void drbd_flush(struct drbd_connection *connection)
/* would rather check on EOPNOTSUPP, but that is not reliable.
* don't try again for ANY return value != 0
* if (rv == -EOPNOTSUPP) */
drbd_bump_write_ordering(connection->resource, NULL, WO_drain_io);
drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO);
}
put_ldev(device);
kref_put(&device->kref, drbd_destroy_device);
@ -1299,10 +1331,10 @@ max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo)
dc = rcu_dereference(bdev->disk_conf);
if (wo == WO_bdev_flush && !dc->disk_flushes)
wo = WO_drain_io;
if (wo == WO_drain_io && !dc->disk_drain)
wo = WO_none;
if (wo == WO_BDEV_FLUSH && !dc->disk_flushes)
wo = WO_DRAIN_IO;
if (wo == WO_DRAIN_IO && !dc->disk_drain)
wo = WO_NONE;
return wo;
}
@ -1319,13 +1351,13 @@ void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backin
enum write_ordering_e pwo;
int vnr;
static char *write_ordering_str[] = {
[WO_none] = "none",
[WO_drain_io] = "drain",
[WO_bdev_flush] = "flush",
[WO_NONE] = "none",
[WO_DRAIN_IO] = "drain",
[WO_BDEV_FLUSH] = "flush",
};
pwo = resource->write_ordering;
if (wo != WO_bdev_flush)
if (wo != WO_BDEV_FLUSH)
wo = min(pwo, wo);
rcu_read_lock();
idr_for_each_entry(&resource->devices, device, vnr) {
@ -1343,7 +1375,7 @@ void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backin
rcu_read_unlock();
resource->write_ordering = wo;
if (pwo != resource->write_ordering || wo == WO_bdev_flush)
if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH)
drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]);
}
@ -1380,7 +1412,7 @@ int drbd_submit_peer_request(struct drbd_device *device,
if (peer_req->flags & EE_IS_TRIM_USE_ZEROOUT) {
/* wait for all pending IO completions, before we start
* zeroing things out. */
conn_wait_active_ee_empty(first_peer_device(device)->connection);
conn_wait_active_ee_empty(peer_req->peer_device->connection);
/* add it to the active list now,
* so we can find it to present it in debugfs */
peer_req->submit_jif = jiffies;
@ -1508,12 +1540,6 @@ static void conn_wait_active_ee_empty(struct drbd_connection *connection)
rcu_read_unlock();
}
static struct drbd_peer_device *
conn_peer_device(struct drbd_connection *connection, int volume_number)
{
return idr_find(&connection->peer_devices, volume_number);
}
static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi)
{
int rv;
@ -1533,7 +1559,7 @@ static int receive_Barrier(struct drbd_connection *connection, struct packet_inf
* Therefore we must send the barrier_ack after the barrier request was
* completed. */
switch (connection->resource->write_ordering) {
case WO_none:
case WO_NONE:
if (rv == FE_RECYCLED)
return 0;
@ -1546,8 +1572,8 @@ static int receive_Barrier(struct drbd_connection *connection, struct packet_inf
drbd_warn(connection, "Allocation of an epoch failed, slowing down\n");
/* Fall through */
case WO_bdev_flush:
case WO_drain_io:
case WO_BDEV_FLUSH:
case WO_DRAIN_IO:
conn_wait_active_ee_empty(connection);
drbd_flush(connection);
@ -1752,7 +1778,7 @@ static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_req
}
/*
* e_end_resync_block() is called in asender context via
* e_end_resync_block() is called in ack_sender context via
* drbd_finish_peer_reqs().
*/
static int e_end_resync_block(struct drbd_work *w, int unused)
@ -1926,7 +1952,7 @@ static void restart_conflicting_writes(struct drbd_device *device,
}
/*
* e_end_block() is called in asender context via drbd_finish_peer_reqs().
* e_end_block() is called in ack_sender context via drbd_finish_peer_reqs().
*/
static int e_end_block(struct drbd_work *w, int cancel)
{
@ -1966,7 +1992,7 @@ static int e_end_block(struct drbd_work *w, int cancel)
} else
D_ASSERT(device, drbd_interval_empty(&peer_req->i));
drbd_may_finish_epoch(first_peer_device(device)->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
return err;
}
@ -2098,7 +2124,7 @@ static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, co
}
rcu_read_lock();
tp = rcu_dereference(first_peer_device(device)->connection->net_conf)->two_primaries;
tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries;
rcu_read_unlock();
if (!tp)
@ -2217,7 +2243,7 @@ static int handle_write_conflicts(struct drbd_device *device,
peer_req->w.cb = superseded ? e_send_superseded :
e_send_retry_write;
list_add_tail(&peer_req->w.list, &device->done_ee);
wake_asender(connection);
queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work);
err = -ENOENT;
goto out;
@ -2364,7 +2390,7 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
if (dp_flags & DP_SEND_RECEIVE_ACK) {
/* I really don't like it that the receiver thread
* sends on the msock, but anyways */
drbd_send_ack(first_peer_device(device), P_RECV_ACK, peer_req);
drbd_send_ack(peer_device, P_RECV_ACK, peer_req);
}
if (tp) {
@ -4056,7 +4082,7 @@ static int receive_state(struct drbd_connection *connection, struct packet_info
os = ns = drbd_read_state(device);
spin_unlock_irq(&device->resource->req_lock);
/* If some other part of the code (asender thread, timeout)
/* If some other part of the code (ack_receiver thread, timeout)
* already decided to close the connection again,
* we must not "re-establish" it here. */
if (os.conn <= C_TEAR_DOWN)
@ -4661,8 +4687,12 @@ static void conn_disconnect(struct drbd_connection *connection)
*/
conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD);
/* asender does not clean up anything. it must not interfere, either */
drbd_thread_stop(&connection->asender);
/* ack_receiver does not clean up anything. it must not interfere, either */
drbd_thread_stop(&connection->ack_receiver);
if (connection->ack_sender) {
destroy_workqueue(connection->ack_sender);
connection->ack_sender = NULL;
}
drbd_free_sock(connection);
rcu_read_lock();
@ -5431,49 +5461,39 @@ static int got_skip(struct drbd_connection *connection, struct packet_info *pi)
return 0;
}
static int connection_finish_peer_reqs(struct drbd_connection *connection)
{
struct drbd_peer_device *peer_device;
int vnr, not_empty = 0;
do {
clear_bit(SIGNAL_ASENDER, &connection->flags);
flush_signals(current);
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
kref_get(&device->kref);
rcu_read_unlock();
if (drbd_finish_peer_reqs(device)) {
kref_put(&device->kref, drbd_destroy_device);
return 1;
}
kref_put(&device->kref, drbd_destroy_device);
rcu_read_lock();
}
set_bit(SIGNAL_ASENDER, &connection->flags);
spin_lock_irq(&connection->resource->req_lock);
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
not_empty = !list_empty(&device->done_ee);
if (not_empty)
break;
}
spin_unlock_irq(&connection->resource->req_lock);
rcu_read_unlock();
} while (not_empty);
return 0;
}
struct asender_cmd {
struct meta_sock_cmd {
size_t pkt_size;
int (*fn)(struct drbd_connection *connection, struct packet_info *);
};
static struct asender_cmd asender_tbl[] = {
static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout)
{
long t;
struct net_conf *nc;
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
t = ping_timeout ? nc->ping_timeo : nc->ping_int;
rcu_read_unlock();
t *= HZ;
if (ping_timeout)
t /= 10;
connection->meta.socket->sk->sk_rcvtimeo = t;
}
static void set_ping_timeout(struct drbd_connection *connection)
{
set_rcvtimeo(connection, 1);
}
static void set_idle_timeout(struct drbd_connection *connection)
{
set_rcvtimeo(connection, 0);
}
static struct meta_sock_cmd ack_receiver_tbl[] = {
[P_PING] = { 0, got_Ping },
[P_PING_ACK] = { 0, got_PingAck },
[P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
@ -5493,64 +5513,40 @@ static struct asender_cmd asender_tbl[] = {
[P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck },
};
int drbd_asender(struct drbd_thread *thi)
int drbd_ack_receiver(struct drbd_thread *thi)
{
struct drbd_connection *connection = thi->connection;
struct asender_cmd *cmd = NULL;
struct meta_sock_cmd *cmd = NULL;
struct packet_info pi;
unsigned long pre_recv_jif;
int rv;
void *buf = connection->meta.rbuf;
int received = 0;
unsigned int header_size = drbd_header_size(connection);
int expect = header_size;
bool ping_timeout_active = false;
struct net_conf *nc;
int ping_timeo, tcp_cork, ping_int;
struct sched_param param = { .sched_priority = 2 };
rv = sched_setscheduler(current, SCHED_RR, &param);
if (rv < 0)
drbd_err(connection, "drbd_asender: ERROR set priority, ret=%d\n", rv);
drbd_err(connection, "drbd_ack_receiver: ERROR set priority, ret=%d\n", rv);
while (get_t_state(thi) == RUNNING) {
drbd_thread_current_set_cpu(thi);
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
ping_timeo = nc->ping_timeo;
tcp_cork = nc->tcp_cork;
ping_int = nc->ping_int;
rcu_read_unlock();
conn_reclaim_net_peer_reqs(connection);
if (test_and_clear_bit(SEND_PING, &connection->flags)) {
if (drbd_send_ping(connection)) {
drbd_err(connection, "drbd_send_ping has failed\n");
goto reconnect;
}
connection->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10;
set_ping_timeout(connection);
ping_timeout_active = true;
}
/* TODO: conditionally cork; it may hurt latency if we cork without
much to send */
if (tcp_cork)
drbd_tcp_cork(connection->meta.socket);
if (connection_finish_peer_reqs(connection)) {
drbd_err(connection, "connection_finish_peer_reqs() failed\n");
goto reconnect;
}
/* but unconditionally uncork unless disabled */
if (tcp_cork)
drbd_tcp_uncork(connection->meta.socket);
/* short circuit, recv_msg would return EINTR anyways. */
if (signal_pending(current))
continue;
pre_recv_jif = jiffies;
rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0);
clear_bit(SIGNAL_ASENDER, &connection->flags);
flush_signals(current);
/* Note:
* -EINTR (on meta) we got a signal
@ -5562,7 +5558,6 @@ int drbd_asender(struct drbd_thread *thi)
* rv < expected: "woken" by signal during receive
* rv == 0 : "connection shut down by peer"
*/
received_more:
if (likely(rv > 0)) {
received += rv;
buf += rv;
@ -5584,8 +5579,7 @@ received_more:
} else if (rv == -EAGAIN) {
/* If the data socket received something meanwhile,
* that is good enough: peer is still alive. */
if (time_after(connection->last_received,
jiffies - connection->meta.socket->sk->sk_rcvtimeo))
if (time_after(connection->last_received, pre_recv_jif))
continue;
if (ping_timeout_active) {
drbd_err(connection, "PingAck did not arrive in time.\n");
@ -5594,6 +5588,10 @@ received_more:
set_bit(SEND_PING, &connection->flags);
continue;
} else if (rv == -EINTR) {
/* maybe drbd_thread_stop(): the while condition will notice.
* maybe woken for send_ping: we'll send a ping above,
* and change the rcvtimeo */
flush_signals(current);
continue;
} else {
drbd_err(connection, "sock_recvmsg returned %d\n", rv);
@ -5603,8 +5601,8 @@ received_more:
if (received == expect && cmd == NULL) {
if (decode_header(connection, connection->meta.rbuf, &pi))
goto reconnect;
cmd = &asender_tbl[pi.cmd];
if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) {
cmd = &ack_receiver_tbl[pi.cmd];
if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) {
drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n",
cmdname(pi.cmd), pi.cmd);
goto disconnect;
@ -5627,9 +5625,8 @@ received_more:
connection->last_received = jiffies;
if (cmd == &asender_tbl[P_PING_ACK]) {
/* restore idle timeout */
connection->meta.socket->sk->sk_rcvtimeo = ping_int * HZ;
if (cmd == &ack_receiver_tbl[P_PING_ACK]) {
set_idle_timeout(connection);
ping_timeout_active = false;
}
@ -5638,11 +5635,6 @@ received_more:
expect = header_size;
cmd = NULL;
}
if (test_bit(SEND_PING, &connection->flags))
continue;
rv = drbd_recv_short(connection->meta.socket, buf, expect-received, MSG_DONTWAIT);
if (rv > 0)
goto received_more;
}
if (0) {
@ -5654,9 +5646,41 @@ reconnect:
disconnect:
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
}
clear_bit(SIGNAL_ASENDER, &connection->flags);
drbd_info(connection, "asender terminated\n");
drbd_info(connection, "ack_receiver terminated\n");
return 0;
}
void drbd_send_acks_wf(struct work_struct *ws)
{
struct drbd_peer_device *peer_device =
container_of(ws, struct drbd_peer_device, send_acks_work);
struct drbd_connection *connection = peer_device->connection;
struct drbd_device *device = peer_device->device;
struct net_conf *nc;
int tcp_cork, err;
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
tcp_cork = nc->tcp_cork;
rcu_read_unlock();
if (tcp_cork)
drbd_tcp_cork(connection->meta.socket);
err = drbd_finish_peer_reqs(device);
kref_put(&device->kref, drbd_destroy_device);
/* get is in drbd_endio_write_sec_final(). That is necessary to keep the
struct work_struct send_acks_work alive, which is in the peer_device object */
if (err) {
conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD);
return;
}
if (tcp_cork)
drbd_tcp_uncork(connection->meta.socket);
return;
}

147
drivers/block/drbd/drbd_req.c
Просмотреть файл

@ -453,12 +453,12 @@ static void mod_rq_state(struct drbd_request *req, struct bio_and_error *m,
kref_get(&req->kref); /* wait for the DONE */
if (!(s & RQ_NET_SENT) && (set & RQ_NET_SENT)) {
/* potentially already completed in the asender thread */
/* potentially already completed in the ack_receiver thread */
if (!(s & RQ_NET_DONE)) {
atomic_add(req->i.size >> 9, &device->ap_in_flight);
set_if_null_req_not_net_done(peer_device, req);
}
if (s & RQ_NET_PENDING)
if (req->rq_state & RQ_NET_PENDING)
set_if_null_req_ack_pending(peer_device, req);
}
@ -1095,6 +1095,24 @@ static bool do_remote_read(struct drbd_request *req)
return false;
}
bool drbd_should_do_remote(union drbd_dev_state s)
{
return s.pdsk == D_UP_TO_DATE ||
(s.pdsk >= D_INCONSISTENT &&
s.conn >= C_WF_BITMAP_T &&
s.conn < C_AHEAD);
/* Before proto 96 that was >= CONNECTED instead of >= C_WF_BITMAP_T.
That is equivalent since before 96 IO was frozen in the C_WF_BITMAP*
states. */
}
static bool drbd_should_send_out_of_sync(union drbd_dev_state s)
{
return s.conn == C_AHEAD || s.conn == C_WF_BITMAP_S;
/* pdsk = D_INCONSISTENT as a consequence. Protocol 96 check not necessary
since we enter state C_AHEAD only if proto >= 96 */
}
/* returns number of connections (== 1, for drbd 8.4)
* expected to actually write this data,
* which does NOT include those that we are L_AHEAD for. */
@ -1149,7 +1167,6 @@ drbd_submit_req_private_bio(struct drbd_request *req)
* stable storage, and this is a WRITE, we may not even submit
* this bio. */
if (get_ldev(device)) {
req->pre_submit_jif = jiffies;
if (drbd_insert_fault(device,
rw == WRITE ? DRBD_FAULT_DT_WR
: rw == READ ? DRBD_FAULT_DT_RD
@ -1293,6 +1310,7 @@ static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request
&device->pending_master_completion[rw == WRITE]);
if (req->private_bio) {
/* needs to be marked within the same spinlock */
req->pre_submit_jif = jiffies;
list_add_tail(&req->req_pending_local,
&device->pending_completion[rw == WRITE]);
_req_mod(req, TO_BE_SUBMITTED);
@ -1513,6 +1531,78 @@ blk_qc_t drbd_make_request(struct request_queue *q, struct bio *bio)
return BLK_QC_T_NONE;
}
static bool net_timeout_reached(struct drbd_request *net_req,
struct drbd_connection *connection,
unsigned long now, unsigned long ent,
unsigned int ko_count, unsigned int timeout)
{
struct drbd_device *device = net_req->device;
if (!time_after(now, net_req->pre_send_jif + ent))
return false;
if (time_in_range(now, connection->last_reconnect_jif, connection->last_reconnect_jif + ent))
return false;
if (net_req->rq_state & RQ_NET_PENDING) {
drbd_warn(device, "Remote failed to finish a request within %ums > ko-count (%u) * timeout (%u * 0.1s)\n",
jiffies_to_msecs(now - net_req->pre_send_jif), ko_count, timeout);
return true;
}
/* We received an ACK already (or are using protocol A),
* but are waiting for the epoch closing barrier ack.
* Check if we sent the barrier already. We should not blame the peer
* for being unresponsive, if we did not even ask it yet. */
if (net_req->epoch == connection->send.current_epoch_nr) {
drbd_warn(device,
"We did not send a P_BARRIER for %ums > ko-count (%u) * timeout (%u * 0.1s); drbd kernel thread blocked?\n",
jiffies_to_msecs(now - net_req->pre_send_jif), ko_count, timeout);
return false;
}
/* Worst case: we may have been blocked for whatever reason, then
* suddenly are able to send a lot of requests (and epoch separating
* barriers) in quick succession.
* The timestamp of the net_req may be much too old and not correspond
* to the sending time of the relevant unack'ed barrier packet, so
* would trigger a spurious timeout. The latest barrier packet may
* have a too recent timestamp to trigger the timeout, potentially miss
* a timeout. Right now we don't have a place to conveniently store
* these timestamps.
* But in this particular situation, the application requests are still
* completed to upper layers, DRBD should still "feel" responsive.
* No need yet to kill this connection, it may still recover.
* If not, eventually we will have queued enough into the network for
* us to block. From that point of view, the timestamp of the last sent
* barrier packet is relevant enough.
*/
if (time_after(now, connection->send.last_sent_barrier_jif + ent)) {
drbd_warn(device, "Remote failed to answer a P_BARRIER (sent at %lu jif; now=%lu jif) within %ums > ko-count (%u) * timeout (%u * 0.1s)\n",
connection->send.last_sent_barrier_jif, now,
jiffies_to_msecs(now - connection->send.last_sent_barrier_jif), ko_count, timeout);
return true;
}
return false;
}
/* A request is considered timed out, if
* - we have some effective timeout from the configuration,
* with some state restrictions applied,
* - the oldest request is waiting for a response from the network
* resp. the local disk,
* - the oldest request is in fact older than the effective timeout,
* - the connection was established (resp. disk was attached)
* for longer than the timeout already.
* Note that for 32bit jiffies and very stable connections/disks,
* we may have a wrap around, which is catched by
* !time_in_range(now, last_..._jif, last_..._jif + timeout).
*
* Side effect: once per 32bit wrap-around interval, which means every
* ~198 days with 250 HZ, we have a window where the timeout would need
* to expire twice (worst case) to become effective. Good enough.
*/
void request_timer_fn(unsigned long data)
{
struct drbd_device *device = (struct drbd_device *) data;
@ -1522,11 +1612,14 @@ void request_timer_fn(unsigned long data)
unsigned long oldest_submit_jif;
unsigned long ent = 0, dt = 0, et, nt; /* effective timeout = ko_count * timeout */
unsigned long now;
unsigned int ko_count = 0, timeout = 0;
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
if (nc && device->state.conn >= C_WF_REPORT_PARAMS)
ent = nc->timeout * HZ/10 * nc->ko_count;
if (nc && device->state.conn >= C_WF_REPORT_PARAMS) {
ko_count = nc->ko_count;
timeout = nc->timeout;
}
if (get_ldev(device)) { /* implicit state.disk >= D_INCONSISTENT */
dt = rcu_dereference(device->ldev->disk_conf)->disk_timeout * HZ / 10;
@ -1534,6 +1627,8 @@ void request_timer_fn(unsigned long data)
}
rcu_read_unlock();
ent = timeout * HZ/10 * ko_count;
et = min_not_zero(dt, ent);
if (!et)
@ -1545,11 +1640,22 @@ void request_timer_fn(unsigned long data)
spin_lock_irq(&device->resource->req_lock);
req_read = list_first_entry_or_null(&device->pending_completion[0], struct drbd_request, req_pending_local);
req_write = list_first_entry_or_null(&device->pending_completion[1], struct drbd_request, req_pending_local);
req_peer = connection->req_not_net_done;
/* maybe the oldest request waiting for the peer is in fact still
* blocking in tcp sendmsg */
if (!req_peer && connection->req_next && connection->req_next->pre_send_jif)
req_peer = connection->req_next;
* blocking in tcp sendmsg. That's ok, though, that's handled via the
* socket send timeout, requesting a ping, and bumping ko-count in
* we_should_drop_the_connection().
*/
/* check the oldest request we did successfully sent,
* but which is still waiting for an ACK. */
req_peer = connection->req_ack_pending;
/* if we don't have such request (e.g. protocoll A)
* check the oldest requests which is still waiting on its epoch
* closing barrier ack. */
if (!req_peer)
req_peer = connection->req_not_net_done;
/* evaluate the oldest peer request only in one timer! */
if (req_peer && req_peer->device != device)
@ -1566,28 +1672,9 @@ void request_timer_fn(unsigned long data)
: req_write ? req_write->pre_submit_jif
: req_read ? req_read->pre_submit_jif : now;
/* The request is considered timed out, if
* - we have some effective timeout from the configuration,
* with above state restrictions applied,
* - the oldest request is waiting for a response from the network
* resp. the local disk,
* - the oldest request is in fact older than the effective timeout,
* - the connection was established (resp. disk was attached)
* for longer than the timeout already.
* Note that for 32bit jiffies and very stable connections/disks,
* we may have a wrap around, which is catched by
* !time_in_range(now, last_..._jif, last_..._jif + timeout).
*
* Side effect: once per 32bit wrap-around interval, which means every
* ~198 days with 250 HZ, we have a window where the timeout would need
* to expire twice (worst case) to become effective. Good enough.
*/
if (ent && req_peer &&
time_after(now, req_peer->pre_send_jif + ent) &&
!time_in_range(now, connection->last_reconnect_jif, connection->last_reconnect_jif + ent)) {
drbd_warn(device, "Remote failed to finish a request within ko-count * timeout\n");
if (ent && req_peer && net_timeout_reached(req_peer, connection, now, ent, ko_count, timeout))
_conn_request_state(connection, NS(conn, C_TIMEOUT), CS_VERBOSE | CS_HARD);
}
if (dt && oldest_submit_jif != now &&
time_after(now, oldest_submit_jif + dt) &&
!time_in_range(now, device->last_reattach_jif, device->last_reattach_jif + dt)) {

17
drivers/block/drbd/drbd_req.h
Просмотреть файл

@ -331,21 +331,6 @@ static inline int req_mod(struct drbd_request *req,
return rv;
}
static inline bool drbd_should_do_remote(union drbd_dev_state s)
{
return s.pdsk == D_UP_TO_DATE ||
(s.pdsk >= D_INCONSISTENT &&
s.conn >= C_WF_BITMAP_T &&
s.conn < C_AHEAD);
/* Before proto 96 that was >= CONNECTED instead of >= C_WF_BITMAP_T.
That is equivalent since before 96 IO was frozen in the C_WF_BITMAP*
states. */
}
static inline bool drbd_should_send_out_of_sync(union drbd_dev_state s)
{
return s.conn == C_AHEAD || s.conn == C_WF_BITMAP_S;
/* pdsk = D_INCONSISTENT as a consequence. Protocol 96 check not necessary
since we enter state C_AHEAD only if proto >= 96 */
}
extern bool drbd_should_do_remote(union drbd_dev_state);
#endif

428
drivers/block/drbd/drbd_state.c
Просмотреть файл

@ -29,6 +29,7 @@
#include "drbd_int.h"
#include "drbd_protocol.h"
#include "drbd_req.h"
#include "drbd_state_change.h"
struct after_state_chg_work {
struct drbd_work w;
@ -37,6 +38,7 @@ struct after_state_chg_work {
union drbd_state ns;
enum chg_state_flags flags;
struct completion *done;
struct drbd_state_change *state_change;
};
enum sanitize_state_warnings {
@ -48,9 +50,248 @@ enum sanitize_state_warnings {
IMPLICITLY_UPGRADED_PDSK,
};
static void count_objects(struct drbd_resource *resource,
unsigned int *n_devices,
unsigned int *n_connections)
{
struct drbd_device *device;
struct drbd_connection *connection;
int vnr;
*n_devices = 0;
*n_connections = 0;
idr_for_each_entry(&resource->devices, device, vnr)
(*n_devices)++;
for_each_connection(connection, resource)
(*n_connections)++;
}
static struct drbd_state_change *alloc_state_change(unsigned int n_devices, unsigned int n_connections, gfp_t gfp)
{
struct drbd_state_change *state_change;
unsigned int size, n;
size = sizeof(struct drbd_state_change) +
n_devices * sizeof(struct drbd_device_state_change) +
n_connections * sizeof(struct drbd_connection_state_change) +
n_devices * n_connections * sizeof(struct drbd_peer_device_state_change);
state_change = kmalloc(size, gfp);
if (!state_change)
return NULL;
state_change->n_devices = n_devices;
state_change->n_connections = n_connections;
state_change->devices = (void *)(state_change + 1);
state_change->connections = (void *)&state_change->devices[n_devices];
state_change->peer_devices = (void *)&state_change->connections[n_connections];
state_change->resource->resource = NULL;
for (n = 0; n < n_devices; n++)
state_change->devices[n].device = NULL;
for (n = 0; n < n_connections; n++)
state_change->connections[n].connection = NULL;
return state_change;
}
struct drbd_state_change *remember_old_state(struct drbd_resource *resource, gfp_t gfp)
{
struct drbd_state_change *state_change;
struct drbd_device *device;
unsigned int n_devices;
struct drbd_connection *connection;
unsigned int n_connections;
int vnr;
struct drbd_device_state_change *device_state_change;
struct drbd_peer_device_state_change *peer_device_state_change;
struct drbd_connection_state_change *connection_state_change;
/* Caller holds req_lock spinlock.
* No state, no device IDR, no connections lists can change. */
count_objects(resource, &n_devices, &n_connections);
state_change = alloc_state_change(n_devices, n_connections, gfp);
if (!state_change)
return NULL;
kref_get(&resource->kref);
state_change->resource->resource = resource;
state_change->resource->role[OLD] =
conn_highest_role(first_connection(resource));
state_change->resource->susp[OLD] = resource->susp;
state_change->resource->susp_nod[OLD] = resource->susp_nod;
state_change->resource->susp_fen[OLD] = resource->susp_fen;
connection_state_change = state_change->connections;
for_each_connection(connection, resource) {
kref_get(&connection->kref);
connection_state_change->connection = connection;
connection_state_change->cstate[OLD] =
connection->cstate;
connection_state_change->peer_role[OLD] =
conn_highest_peer(connection);
connection_state_change++;
}
device_state_change = state_change->devices;
peer_device_state_change = state_change->peer_devices;
idr_for_each_entry(&resource->devices, device, vnr) {
kref_get(&device->kref);
device_state_change->device = device;
device_state_change->disk_state[OLD] = device->state.disk;
/* The peer_devices for each device have to be enumerated in
the order of the connections. We may not use for_each_peer_device() here. */
for_each_connection(connection, resource) {
struct drbd_peer_device *peer_device;
peer_device = conn_peer_device(connection, device->vnr);
peer_device_state_change->peer_device = peer_device;
peer_device_state_change->disk_state[OLD] =
device->state.pdsk;
peer_device_state_change->repl_state[OLD] =
max_t(enum drbd_conns,
C_WF_REPORT_PARAMS, device->state.conn);
peer_device_state_change->resync_susp_user[OLD] =
device->state.user_isp;
peer_device_state_change->resync_susp_peer[OLD] =
device->state.peer_isp;
peer_device_state_change->resync_susp_dependency[OLD] =
device->state.aftr_isp;
peer_device_state_change++;
}
device_state_change++;
}
return state_change;
}
static void remember_new_state(struct drbd_state_change *state_change)
{
struct drbd_resource_state_change *resource_state_change;
struct drbd_resource *resource;
unsigned int n;
if (!state_change)
return;
resource_state_change = &state_change->resource[0];
resource = resource_state_change->resource;
resource_state_change->role[NEW] =
conn_highest_role(first_connection(resource));
resource_state_change->susp[NEW] = resource->susp;
resource_state_change->susp_nod[NEW] = resource->susp_nod;
resource_state_change->susp_fen[NEW] = resource->susp_fen;
for (n = 0; n < state_change->n_devices; n++) {
struct drbd_device_state_change *device_state_change =
&state_change->devices[n];
struct drbd_device *device = device_state_change->device;
device_state_change->disk_state[NEW] = device->state.disk;
}
for (n = 0; n < state_change->n_connections; n++) {
struct drbd_connection_state_change *connection_state_change =
&state_change->connections[n];
struct drbd_connection *connection =
connection_state_change->connection;
connection_state_change->cstate[NEW] = connection->cstate;
connection_state_change->peer_role[NEW] =
conn_highest_peer(connection);
}
for (n = 0; n < state_change->n_devices * state_change->n_connections; n++) {
struct drbd_peer_device_state_change *peer_device_state_change =
&state_change->peer_devices[n];
struct drbd_device *device =
peer_device_state_change->peer_device->device;
union drbd_dev_state state = device->state;
peer_device_state_change->disk_state[NEW] = state.pdsk;
peer_device_state_change->repl_state[NEW] =
max_t(enum drbd_conns, C_WF_REPORT_PARAMS, state.conn);
peer_device_state_change->resync_susp_user[NEW] =
state.user_isp;
peer_device_state_change->resync_susp_peer[NEW] =
state.peer_isp;
peer_device_state_change->resync_susp_dependency[NEW] =
state.aftr_isp;
}
}
void copy_old_to_new_state_change(struct drbd_state_change *state_change)
{
struct drbd_resource_state_change *resource_state_change = &state_change->resource[0];
unsigned int n_device, n_connection, n_peer_device, n_peer_devices;
#define OLD_TO_NEW(x) \
(x[NEW] = x[OLD])
OLD_TO_NEW(resource_state_change->role);
OLD_TO_NEW(resource_state_change->susp);
OLD_TO_NEW(resource_state_change->susp_nod);
OLD_TO_NEW(resource_state_change->susp_fen);
for (n_connection = 0; n_connection < state_change->n_connections; n_connection++) {
struct drbd_connection_state_change *connection_state_change =
&state_change->connections[n_connection];
OLD_TO_NEW(connection_state_change->peer_role);
OLD_TO_NEW(connection_state_change->cstate);
}
for (n_device = 0; n_device < state_change->n_devices; n_device++) {
struct drbd_device_state_change *device_state_change =
&state_change->devices[n_device];
OLD_TO_NEW(device_state_change->disk_state);
}
n_peer_devices = state_change->n_devices * state_change->n_connections;
for (n_peer_device = 0; n_peer_device < n_peer_devices; n_peer_device++) {
struct drbd_peer_device_state_change *p =
&state_change->peer_devices[n_peer_device];
OLD_TO_NEW(p->disk_state);
OLD_TO_NEW(p->repl_state);
OLD_TO_NEW(p->resync_susp_user);
OLD_TO_NEW(p->resync_susp_peer);
OLD_TO_NEW(p->resync_susp_dependency);
}
#undef OLD_TO_NEW
}
void forget_state_change(struct drbd_state_change *state_change)
{
unsigned int n;
if (!state_change)
return;
if (state_change->resource->resource)
kref_put(&state_change->resource->resource->kref, drbd_destroy_resource);
for (n = 0; n < state_change->n_devices; n++) {
struct drbd_device *device = state_change->devices[n].device;
if (device)
kref_put(&device->kref, drbd_destroy_device);
}
for (n = 0; n < state_change->n_connections; n++) {
struct drbd_connection *connection =
state_change->connections[n].connection;
if (connection)
kref_put(&connection->kref, drbd_destroy_connection);
}
kfree(state_change);
}
static int w_after_state_ch(struct drbd_work *w, int unused);
static void after_state_ch(struct drbd_device *device, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags);
union drbd_state ns, enum chg_state_flags flags,
struct drbd_state_change *);
static enum drbd_state_rv is_valid_state(struct drbd_device *, union drbd_state);
static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state, struct drbd_connection *);
static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns);
@ -93,6 +334,7 @@ static enum drbd_role max_role(enum drbd_role role1, enum drbd_role role2)
return R_SECONDARY;
return R_UNKNOWN;
}
static enum drbd_role min_role(enum drbd_role role1, enum drbd_role role2)
{
if (role1 == R_UNKNOWN || role2 == R_UNKNOWN)
@ -937,7 +1179,7 @@ void drbd_resume_al(struct drbd_device *device)
drbd_info(device, "Resumed AL updates\n");
}
/* helper for __drbd_set_state */
/* helper for _drbd_set_state */
static void set_ov_position(struct drbd_device *device, enum drbd_conns cs)
{
if (first_peer_device(device)->connection->agreed_pro_version < 90)
@ -965,17 +1207,17 @@ static void set_ov_position(struct drbd_device *device, enum drbd_conns cs)
}
/**
* __drbd_set_state() - Set a new DRBD state
* _drbd_set_state() - Set a new DRBD state
* @device: DRBD device.
* @ns: new state.
* @flags: Flags
* @done: Optional completion, that will get completed after the after_state_ch() finished
*
* Caller needs to hold req_lock, and global_state_lock. Do not call directly.
* Caller needs to hold req_lock. Do not call directly.
*/
enum drbd_state_rv
__drbd_set_state(struct drbd_device *device, union drbd_state ns,
enum chg_state_flags flags, struct completion *done)
_drbd_set_state(struct drbd_device *device, union drbd_state ns,
enum chg_state_flags flags, struct completion *done)
{
struct drbd_peer_device *peer_device = first_peer_device(device);
struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
@ -983,6 +1225,7 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
enum drbd_state_rv rv = SS_SUCCESS;
enum sanitize_state_warnings ssw;
struct after_state_chg_work *ascw;
struct drbd_state_change *state_change;
os = drbd_read_state(device);
@ -1037,6 +1280,9 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
if (!is_sync_state(os.conn) && is_sync_state(ns.conn))
clear_bit(RS_DONE, &device->flags);
/* FIXME: Have any flags been set earlier in this function already? */
state_change = remember_old_state(device->resource, GFP_ATOMIC);
/* changes to local_cnt and device flags should be visible before
* changes to state, which again should be visible before anything else
* depending on that change happens. */
@ -1047,6 +1293,8 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
device->resource->susp_fen = ns.susp_fen;
smp_wmb();
remember_new_state(state_change);
/* put replicated vs not-replicated requests in seperate epochs */
if (drbd_should_do_remote((union drbd_dev_state)os.i) !=
drbd_should_do_remote((union drbd_dev_state)ns.i))
@ -1184,6 +1432,7 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
ascw->w.cb = w_after_state_ch;
ascw->device = device;
ascw->done = done;
ascw->state_change = state_change;
drbd_queue_work(&connection->sender_work,
&ascw->w);
} else {
@ -1199,7 +1448,8 @@ static int w_after_state_ch(struct drbd_work *w, int unused)
container_of(w, struct after_state_chg_work, w);
struct drbd_device *device = ascw->device;
after_state_ch(device, ascw->os, ascw->ns, ascw->flags);
after_state_ch(device, ascw->os, ascw->ns, ascw->flags, ascw->state_change);
forget_state_change(ascw->state_change);
if (ascw->flags & CS_WAIT_COMPLETE)
complete(ascw->done);
kfree(ascw);
@ -1234,7 +1484,7 @@ int drbd_bitmap_io_from_worker(struct drbd_device *device,
D_ASSERT(device, current == first_peer_device(device)->connection->worker.task);
/* open coded non-blocking drbd_suspend_io(device); */
set_bit(SUSPEND_IO, &device->flags);
atomic_inc(&device->suspend_cnt);
drbd_bm_lock(device, why, flags);
rv = io_fn(device);
@ -1245,6 +1495,139 @@ int drbd_bitmap_io_from_worker(struct drbd_device *device,
return rv;
}
void notify_resource_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_resource_state_change *resource_state_change,
enum drbd_notification_type type)
{
struct drbd_resource *resource = resource_state_change->resource;
struct resource_info resource_info = {
.res_role = resource_state_change->role[NEW],
.res_susp = resource_state_change->susp[NEW],
.res_susp_nod = resource_state_change->susp_nod[NEW],
.res_susp_fen = resource_state_change->susp_fen[NEW],
};
notify_resource_state(skb, seq, resource, &resource_info, type);
}
void notify_connection_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_connection_state_change *connection_state_change,
enum drbd_notification_type type)
{
struct drbd_connection *connection = connection_state_change->connection;
struct connection_info connection_info = {
.conn_connection_state = connection_state_change->cstate[NEW],
.conn_role = connection_state_change->peer_role[NEW],
};
notify_connection_state(skb, seq, connection, &connection_info, type);
}
void notify_device_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_device_state_change *device_state_change,
enum drbd_notification_type type)
{
struct drbd_device *device = device_state_change->device;
struct device_info device_info = {
.dev_disk_state = device_state_change->disk_state[NEW],
};
notify_device_state(skb, seq, device, &device_info, type);
}
void notify_peer_device_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_peer_device_state_change *p,
enum drbd_notification_type type)
{
struct drbd_peer_device *peer_device = p->peer_device;
struct peer_device_info peer_device_info = {
.peer_repl_state = p->repl_state[NEW],
.peer_disk_state = p->disk_state[NEW],
.peer_resync_susp_user = p->resync_susp_user[NEW],
.peer_resync_susp_peer = p->resync_susp_peer[NEW],
.peer_resync_susp_dependency = p->resync_susp_dependency[NEW],
};
notify_peer_device_state(skb, seq, peer_device, &peer_device_info, type);
}
static void broadcast_state_change(struct drbd_state_change *state_change)
{
struct drbd_resource_state_change *resource_state_change = &state_change->resource[0];
bool resource_state_has_changed;
unsigned int n_device, n_connection, n_peer_device, n_peer_devices;
void (*last_func)(struct sk_buff *, unsigned int, void *,
enum drbd_notification_type) = NULL;
void *uninitialized_var(last_arg);
#define HAS_CHANGED(state) ((state)[OLD] != (state)[NEW])
#define FINAL_STATE_CHANGE(type) \
({ if (last_func) \
last_func(NULL, 0, last_arg, type); \
})
#define REMEMBER_STATE_CHANGE(func, arg, type) \
({ FINAL_STATE_CHANGE(type | NOTIFY_CONTINUES); \
last_func = (typeof(last_func))func; \
last_arg = arg; \
})
mutex_lock(&notification_mutex);
resource_state_has_changed =
HAS_CHANGED(resource_state_change->role) ||
HAS_CHANGED(resource_state_change->susp) ||
HAS_CHANGED(resource_state_change->susp_nod) ||
HAS_CHANGED(resource_state_change->susp_fen);
if (resource_state_has_changed)
REMEMBER_STATE_CHANGE(notify_resource_state_change,
resource_state_change, NOTIFY_CHANGE);
for (n_connection = 0; n_connection < state_change->n_connections; n_connection++) {
struct drbd_connection_state_change *connection_state_change =
&state_change->connections[n_connection];
if (HAS_CHANGED(connection_state_change->peer_role) ||
HAS_CHANGED(connection_state_change->cstate))
REMEMBER_STATE_CHANGE(notify_connection_state_change,
connection_state_change, NOTIFY_CHANGE);
}
for (n_device = 0; n_device < state_change->n_devices; n_device++) {
struct drbd_device_state_change *device_state_change =
&state_change->devices[n_device];
if (HAS_CHANGED(device_state_change->disk_state))
REMEMBER_STATE_CHANGE(notify_device_state_change,
device_state_change, NOTIFY_CHANGE);
}
n_peer_devices = state_change->n_devices * state_change->n_connections;
for (n_peer_device = 0; n_peer_device < n_peer_devices; n_peer_device++) {
struct drbd_peer_device_state_change *p =
&state_change->peer_devices[n_peer_device];
if (HAS_CHANGED(p->disk_state) ||
HAS_CHANGED(p->repl_state) ||
HAS_CHANGED(p->resync_susp_user) ||
HAS_CHANGED(p->resync_susp_peer) ||
HAS_CHANGED(p->resync_susp_dependency))
REMEMBER_STATE_CHANGE(notify_peer_device_state_change,
p, NOTIFY_CHANGE);
}
FINAL_STATE_CHANGE(NOTIFY_CHANGE);
mutex_unlock(&notification_mutex);
#undef HAS_CHANGED
#undef FINAL_STATE_CHANGE
#undef REMEMBER_STATE_CHANGE
}
/**
* after_state_ch() - Perform after state change actions that may sleep
* @device: DRBD device.
@ -1253,13 +1636,16 @@ int drbd_bitmap_io_from_worker(struct drbd_device *device,
* @flags: Flags
*/
static void after_state_ch(struct drbd_device *device, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags)
union drbd_state ns, enum chg_state_flags flags,
struct drbd_state_change *state_change)
{
struct drbd_resource *resource = device->resource;
struct drbd_peer_device *peer_device = first_peer_device(device);
struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
struct sib_info sib;
broadcast_state_change(state_change);
sib.sib_reason = SIB_STATE_CHANGE;
sib.os = os;
sib.ns = ns;
@ -1377,7 +1763,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
}
if (ns.pdsk < D_INCONSISTENT && get_ldev(device)) {
if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY &&
if (os.peer != R_PRIMARY && ns.peer == R_PRIMARY &&
device->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
drbd_uuid_new_current(device);
drbd_send_uuids(peer_device);
@ -1444,7 +1830,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
if (os.disk != D_FAILED && ns.disk == D_FAILED) {
enum drbd_io_error_p eh = EP_PASS_ON;
int was_io_error = 0;
/* corresponding get_ldev was in __drbd_set_state, to serialize
/* corresponding get_ldev was in _drbd_set_state, to serialize
* our cleanup here with the transition to D_DISKLESS.
* But is is still not save to dreference ldev here, since
* we might come from an failed Attach before ldev was set. */
@ -1455,6 +1841,10 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &device->flags);
/* Intentionally call this handler first, before drbd_send_state().
* See: 2932204 drbd: call local-io-error handler early
* People may chose to hard-reset the box from this handler.
* It is useful if this looks like a "regular node crash". */
if (was_io_error && eh == EP_CALL_HELPER)
drbd_khelper(device, "local-io-error");
@ -1572,6 +1962,7 @@ struct after_conn_state_chg_work {
union drbd_state ns_max; /* new, max state, over all devices */
enum chg_state_flags flags;
struct drbd_connection *connection;
struct drbd_state_change *state_change;
};
static int w_after_conn_state_ch(struct drbd_work *w, int unused)
@ -1584,6 +1975,8 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
struct drbd_peer_device *peer_device;
int vnr;
broadcast_state_change(acscw->state_change);
forget_state_change(acscw->state_change);
kfree(acscw);
/* Upon network configuration, we need to start the receiver */
@ -1593,6 +1986,13 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) {
struct net_conf *old_conf;
mutex_lock(&notification_mutex);
idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
notify_peer_device_state(NULL, 0, peer_device, NULL,
NOTIFY_DESTROY | NOTIFY_CONTINUES);
notify_connection_state(NULL, 0, connection, NULL, NOTIFY_DESTROY);
mutex_unlock(&notification_mutex);
mutex_lock(&connection->resource->conf_update);
old_conf = connection->net_conf;
connection->my_addr_len = 0;
@ -1759,7 +2159,7 @@ conn_set_state(struct drbd_connection *connection, union drbd_state mask, union
if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
ns.disk = os.disk;
rv = __drbd_set_state(device, ns, flags, NULL);
rv = _drbd_set_state(device, ns, flags, NULL);
if (rv < SS_SUCCESS)
BUG();
@ -1823,6 +2223,7 @@ _conn_request_state(struct drbd_connection *connection, union drbd_state mask, u
enum drbd_conns oc = connection->cstate;
union drbd_state ns_max, ns_min, os;
bool have_mutex = false;
struct drbd_state_change *state_change;
if (mask.conn) {
rv = is_valid_conn_transition(oc, val.conn);
@ -1868,10 +2269,12 @@ _conn_request_state(struct drbd_connection *connection, union drbd_state mask, u
goto abort;
}
state_change = remember_old_state(connection->resource, GFP_ATOMIC);
conn_old_common_state(connection, &os, &flags);
flags |= CS_DC_SUSP;
conn_set_state(connection, mask, val, &ns_min, &ns_max, flags);
conn_pr_state_change(connection, os, ns_max, flags);
remember_new_state(state_change);
acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC);
if (acscw) {
@ -1882,6 +2285,7 @@ _conn_request_state(struct drbd_connection *connection, union drbd_state mask, u
acscw->w.cb = w_after_conn_state_ch;
kref_get(&connection->kref);
acscw->connection = connection;
acscw->state_change = state_change;
drbd_queue_work(&connection->sender_work, &acscw->w);
} else {
drbd_err(connection, "Could not kmalloc an acscw\n");

6
drivers/block/drbd/drbd_state.h
Просмотреть файл

@ -122,9 +122,9 @@ extern enum drbd_state_rv
_drbd_request_state_holding_state_mutex(struct drbd_device *, union drbd_state,
union drbd_state, enum chg_state_flags);
extern enum drbd_state_rv __drbd_set_state(struct drbd_device *, union drbd_state,
enum chg_state_flags,
struct completion *done);
extern enum drbd_state_rv _drbd_set_state(struct drbd_device *, union drbd_state,
enum chg_state_flags,
struct completion *done);
extern void print_st_err(struct drbd_device *, union drbd_state,
union drbd_state, int);

63
drivers/block/drbd/drbd_state_change.h Normal file
Просмотреть файл

@ -0,0 +1,63 @@
#ifndef DRBD_STATE_CHANGE_H
#define DRBD_STATE_CHANGE_H
struct drbd_resource_state_change {
struct drbd_resource *resource;
enum drbd_role role[2];
bool susp[2];
bool susp_nod[2];
bool susp_fen[2];
};
struct drbd_device_state_change {
struct drbd_device *device;
enum drbd_disk_state disk_state[2];
};
struct drbd_connection_state_change {
struct drbd_connection *connection;
enum drbd_conns cstate[2]; /* drbd9: enum drbd_conn_state */
enum drbd_role peer_role[2];
};
struct drbd_peer_device_state_change {
struct drbd_peer_device *peer_device;
enum drbd_disk_state disk_state[2];
enum drbd_conns repl_state[2]; /* drbd9: enum drbd_repl_state */
bool resync_susp_user[2];
bool resync_susp_peer[2];
bool resync_susp_dependency[2];
};
struct drbd_state_change {
struct list_head list;
unsigned int n_devices;
unsigned int n_connections;
struct drbd_resource_state_change resource[1];
struct drbd_device_state_change *devices;
struct drbd_connection_state_change *connections;
struct drbd_peer_device_state_change *peer_devices;
};
extern struct drbd_state_change *remember_old_state(struct drbd_resource *, gfp_t);
extern void copy_old_to_new_state_change(struct drbd_state_change *);
extern void forget_state_change(struct drbd_state_change *);
extern void notify_resource_state_change(struct sk_buff *,
unsigned int,
struct drbd_resource_state_change *,
enum drbd_notification_type type);
extern void notify_connection_state_change(struct sk_buff *,
unsigned int,
struct drbd_connection_state_change *,
enum drbd_notification_type type);
extern void notify_device_state_change(struct sk_buff *,
unsigned int,
struct drbd_device_state_change *,
enum drbd_notification_type type);
extern void notify_peer_device_state_change(struct sk_buff *,
unsigned int,
struct drbd_peer_device_state_change *,
enum drbd_notification_type type);
#endif /* DRBD_STATE_CHANGE_H */

105
drivers/block/drbd/drbd_worker.c
Просмотреть файл

@ -55,13 +55,6 @@ static int make_resync_request(struct drbd_device *, int);
*
*/
/* About the global_state_lock
Each state transition on an device holds a read lock. In case we have
to evaluate the resync after dependencies, we grab a write lock, because
we need stable states on all devices for that. */
rwlock_t global_state_lock;
/* used for synchronous meta data and bitmap IO
* submitted by drbd_md_sync_page_io()
*/
@ -120,6 +113,7 @@ void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(l
unsigned long flags = 0;
struct drbd_peer_device *peer_device = peer_req->peer_device;
struct drbd_device *device = peer_device->device;
struct drbd_connection *connection = peer_device->connection;
struct drbd_interval i;
int do_wake;
u64 block_id;
@ -152,6 +146,12 @@ void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(l
* ((peer_req->flags & (EE_WAS_ERROR|EE_IS_TRIM)) == EE_WAS_ERROR) */
if (peer_req->flags & EE_WAS_ERROR)
__drbd_chk_io_error(device, DRBD_WRITE_ERROR);
if (connection->cstate >= C_WF_REPORT_PARAMS) {
kref_get(&device->kref); /* put is in drbd_send_acks_wf() */
if (!queue_work(connection->ack_sender, &peer_device->send_acks_work))
kref_put(&device->kref, drbd_destroy_device);
}
spin_unlock_irqrestore(&device->resource->req_lock, flags);
if (block_id == ID_SYNCER)
@ -163,7 +163,6 @@ void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(l
if (do_al_complete_io)
drbd_al_complete_io(device, &i);
wake_asender(peer_device->connection);
put_ldev(device);
}
@ -195,6 +194,12 @@ void drbd_peer_request_endio(struct bio *bio)
}
}
void drbd_panic_after_delayed_completion_of_aborted_request(struct drbd_device *device)
{
panic("drbd%u %s/%u potential random memory corruption caused by delayed completion of aborted local request\n",
device->minor, device->resource->name, device->vnr);
}
/* read, readA or write requests on R_PRIMARY coming from drbd_make_request
*/
void drbd_request_endio(struct bio *bio)
@ -238,7 +243,7 @@ void drbd_request_endio(struct bio *bio)
drbd_emerg(device, "delayed completion of aborted local request; disk-timeout may be too aggressive\n");
if (!bio->bi_error)
panic("possible random memory corruption caused by delayed completion of aborted local request\n");
drbd_panic_after_delayed_completion_of_aborted_request(device);
}
/* to avoid recursion in __req_mod */
@ -1291,6 +1296,7 @@ static int drbd_send_barrier(struct drbd_connection *connection)
p->barrier = connection->send.current_epoch_nr;
p->pad = 0;
connection->send.current_epoch_writes = 0;
connection->send.last_sent_barrier_jif = jiffies;
return conn_send_command(connection, sock, P_BARRIER, sizeof(*p), NULL, 0);
}
@ -1315,6 +1321,7 @@ static void re_init_if_first_write(struct drbd_connection *connection, unsigned
connection->send.seen_any_write_yet = true;
connection->send.current_epoch_nr = epoch;
connection->send.current_epoch_writes = 0;
connection->send.last_sent_barrier_jif = jiffies;
}
}
@ -1456,70 +1463,73 @@ static int _drbd_may_sync_now(struct drbd_device *device)
}
/**
* _drbd_pause_after() - Pause resync on all devices that may not resync now
* drbd_pause_after() - Pause resync on all devices that may not resync now
* @device: DRBD device.
*
* Called from process context only (admin command and after_state_ch).
*/
static int _drbd_pause_after(struct drbd_device *device)
static bool drbd_pause_after(struct drbd_device *device)
{
bool changed = false;
struct drbd_device *odev;
int i, rv = 0;
int i;
rcu_read_lock();
idr_for_each_entry(&drbd_devices, odev, i) {
if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS)
continue;
if (!_drbd_may_sync_now(odev))
rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL)
!= SS_NOTHING_TO_DO);
if (!_drbd_may_sync_now(odev) &&
_drbd_set_state(_NS(odev, aftr_isp, 1),
CS_HARD, NULL) != SS_NOTHING_TO_DO)
changed = true;
}
rcu_read_unlock();
return rv;
return changed;
}
/**
* _drbd_resume_next() - Resume resync on all devices that may resync now
* drbd_resume_next() - Resume resync on all devices that may resync now
* @device: DRBD device.
*
* Called from process context only (admin command and worker).
*/
static int _drbd_resume_next(struct drbd_device *device)
static bool drbd_resume_next(struct drbd_device *device)
{
bool changed = false;
struct drbd_device *odev;
int i, rv = 0;
int i;
rcu_read_lock();
idr_for_each_entry(&drbd_devices, odev, i) {
if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS)
continue;
if (odev->state.aftr_isp) {
if (_drbd_may_sync_now(odev))
rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0),
CS_HARD, NULL)
!= SS_NOTHING_TO_DO) ;
if (_drbd_may_sync_now(odev) &&
_drbd_set_state(_NS(odev, aftr_isp, 0),
CS_HARD, NULL) != SS_NOTHING_TO_DO)
changed = true;
}
}
rcu_read_unlock();
return rv;
return changed;
}
void resume_next_sg(struct drbd_device *device)
{
write_lock_irq(&global_state_lock);
_drbd_resume_next(device);
write_unlock_irq(&global_state_lock);
lock_all_resources();
drbd_resume_next(device);
unlock_all_resources();
}
void suspend_other_sg(struct drbd_device *device)
{
write_lock_irq(&global_state_lock);
_drbd_pause_after(device);
write_unlock_irq(&global_state_lock);
lock_all_resources();
drbd_pause_after(device);
unlock_all_resources();
}
/* caller must hold global_state_lock */
/* caller must lock_all_resources() */
enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor)
{
struct drbd_device *odev;
@ -1557,15 +1567,15 @@ enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_min
}
}
/* caller must hold global_state_lock */
/* caller must lock_all_resources() */
void drbd_resync_after_changed(struct drbd_device *device)
{
int changes;
int changed;
do {
changes = _drbd_pause_after(device);
changes |= _drbd_resume_next(device);
} while (changes);
changed = drbd_pause_after(device);
changed |= drbd_resume_next(device);
} while (changed);
}
void drbd_rs_controller_reset(struct drbd_device *device)
@ -1685,19 +1695,14 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
} else {
mutex_lock(device->state_mutex);
}
clear_bit(B_RS_H_DONE, &device->flags);
/* req_lock: serialize with drbd_send_and_submit() and others
* global_state_lock: for stable sync-after dependencies */
spin_lock_irq(&device->resource->req_lock);
write_lock(&global_state_lock);
lock_all_resources();
clear_bit(B_RS_H_DONE, &device->flags);
/* Did some connection breakage or IO error race with us? */
if (device->state.conn < C_CONNECTED
|| !get_ldev_if_state(device, D_NEGOTIATING)) {
write_unlock(&global_state_lock);
spin_unlock_irq(&device->resource->req_lock);
mutex_unlock(device->state_mutex);
return;
unlock_all_resources();
goto out;
}
ns = drbd_read_state(device);
@ -1711,7 +1716,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
else /* side == C_SYNC_SOURCE */
ns.pdsk = D_INCONSISTENT;
r = __drbd_set_state(device, ns, CS_VERBOSE, NULL);
r = _drbd_set_state(device, ns, CS_VERBOSE, NULL);
ns = drbd_read_state(device);
if (ns.conn < C_CONNECTED)
@ -1732,7 +1737,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
device->rs_mark_left[i] = tw;
device->rs_mark_time[i] = now;
}
_drbd_pause_after(device);
drbd_pause_after(device);
/* Forget potentially stale cached per resync extent bit-counts.
* Open coded drbd_rs_cancel_all(device), we already have IRQs
* disabled, and know the disk state is ok. */
@ -1742,8 +1747,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
device->resync_wenr = LC_FREE;
spin_unlock(&device->al_lock);
}
write_unlock(&global_state_lock);
spin_unlock_irq(&device->resource->req_lock);
unlock_all_resources();
if (r == SS_SUCCESS) {
wake_up(&device->al_wait); /* for lc_reset() above */
@ -1807,6 +1811,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
drbd_md_sync(device);
}
put_ldev(device);
out:
mutex_unlock(device->state_mutex);
}
@ -1836,7 +1841,7 @@ static void drbd_ldev_destroy(struct drbd_device *device)
device->act_log = NULL;
__acquire(local);
drbd_free_ldev(device->ldev);
drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
__release(local);

6
drivers/block/mtip32xx/mtip32xx.c
Просмотреть файл

@ -104,9 +104,9 @@
/* Device instance number, incremented each time a device is probed. */
static int instance;
struct list_head online_list;
struct list_head removing_list;
spinlock_t dev_lock;
static struct list_head online_list;
static struct list_head removing_list;
static spinlock_t dev_lock;
/*
* Global variable used to hold the major block device number

8
drivers/block/null_blk.c
Просмотреть файл

@ -495,17 +495,17 @@ static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
id->ppaf.ch_offset = 56;
id->ppaf.ch_len = 8;
do_div(size, bs); /* convert size to pages */
do_div(size, 256); /* concert size to pgs pr blk */
sector_div(size, bs); /* convert size to pages */
size >>= 8; /* concert size to pgs pr blk */
grp = &id->groups[0];
grp->mtype = 0;
grp->fmtype = 0;
grp->num_ch = 1;
grp->num_pg = 256;
blksize = size;
do_div(size, (1 << 16));
size >>= 16;
grp->num_lun = size + 1;
do_div(blksize, grp->num_lun);
sector_div(blksize, grp->num_lun);
grp->num_blk = blksize;
grp->num_pln = 1;

7
drivers/block/sx8.c
Просмотреть файл

@ -23,7 +23,7 @@
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/ktime.h>
#include <linux/hdreg.h>
#include <linux/dma-mapping.h>
#include <linux/completion.h>
@ -671,16 +671,15 @@ static int carm_send_special (struct carm_host *host, carm_sspc_t func)
static unsigned int carm_fill_sync_time(struct carm_host *host,
unsigned int idx, void *mem)
{
struct timeval tv;
struct carm_msg_sync_time *st = mem;
do_gettimeofday(&tv);
time64_t tv = ktime_get_real_seconds();
memset(st, 0, sizeof(*st));
st->type = CARM_MSG_MISC;
st->subtype = MISC_SET_TIME;
st->handle = cpu_to_le32(TAG_ENCODE(idx));
st->timestamp = cpu_to_le32(tv.tv_sec);
st->timestamp = cpu_to_le32(tv);
return sizeof(struct carm_msg_sync_time);
}

391
drivers/block/xen-blkback/blkback.c
Просмотреть файл

@ -83,6 +83,16 @@ module_param_named(max_persistent_grants, xen_blkif_max_pgrants, int, 0644);
MODULE_PARM_DESC(max_persistent_grants,
"Maximum number of grants to map persistently");
/*
* Maximum number of rings/queues blkback supports, allow as many queues as there
* are CPUs if user has not specified a value.
*/
unsigned int xenblk_max_queues;
module_param_named(max_queues, xenblk_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
"Maximum number of hardware queues per virtual disk." \
"By default it is the number of online CPUs.");
/*
* Maximum order of pages to be used for the shared ring between front and
* backend, 4KB page granularity is used.
@ -113,71 +123,71 @@ module_param(log_stats, int, 0644);
/* Number of free pages to remove on each call to gnttab_free_pages */
#define NUM_BATCH_FREE_PAGES 10
static inline int get_free_page(struct xen_blkif *blkif, struct page **page)
static inline int get_free_page(struct xen_blkif_ring *ring, struct page **page)
{
unsigned long flags;
spin_lock_irqsave(&blkif->free_pages_lock, flags);
if (list_empty(&blkif->free_pages)) {
BUG_ON(blkif->free_pages_num != 0);
spin_unlock_irqrestore(&blkif->free_pages_lock, flags);
spin_lock_irqsave(&ring->free_pages_lock, flags);
if (list_empty(&ring->free_pages)) {
BUG_ON(ring->free_pages_num != 0);
spin_unlock_irqrestore(&ring->free_pages_lock, flags);
return gnttab_alloc_pages(1, page);
}
BUG_ON(blkif->free_pages_num == 0);
page[0] = list_first_entry(&blkif->free_pages, struct page, lru);
BUG_ON(ring->free_pages_num == 0);
page[0] = list_first_entry(&ring->free_pages, struct page, lru);
list_del(&page[0]->lru);
blkif->free_pages_num--;
spin_unlock_irqrestore(&blkif->free_pages_lock, flags);
ring->free_pages_num--;
spin_unlock_irqrestore(&ring->free_pages_lock, flags);
return 0;
}
static inline void put_free_pages(struct xen_blkif *blkif, struct page **page,
static inline void put_free_pages(struct xen_blkif_ring *ring, struct page **page,
int num)
{
unsigned long flags;
int i;
spin_lock_irqsave(&blkif->free_pages_lock, flags);
spin_lock_irqsave(&ring->free_pages_lock, flags);
for (i = 0; i < num; i++)
list_add(&page[i]->lru, &blkif->free_pages);
blkif->free_pages_num += num;
spin_unlock_irqrestore(&blkif->free_pages_lock, flags);
list_add(&page[i]->lru, &ring->free_pages);
ring->free_pages_num += num;
spin_unlock_irqrestore(&ring->free_pages_lock, flags);
}
static inline void shrink_free_pagepool(struct xen_blkif *blkif, int num)
static inline void shrink_free_pagepool(struct xen_blkif_ring *ring, int num)
{
/* Remove requested pages in batches of NUM_BATCH_FREE_PAGES */
struct page *page[NUM_BATCH_FREE_PAGES];
unsigned int num_pages = 0;
unsigned long flags;
spin_lock_irqsave(&blkif->free_pages_lock, flags);
while (blkif->free_pages_num > num) {
BUG_ON(list_empty(&blkif->free_pages));
page[num_pages] = list_first_entry(&blkif->free_pages,
spin_lock_irqsave(&ring->free_pages_lock, flags);
while (ring->free_pages_num > num) {
BUG_ON(list_empty(&ring->free_pages));
page[num_pages] = list_first_entry(&ring->free_pages,
struct page, lru);
list_del(&page[num_pages]->lru);
blkif->free_pages_num--;
ring->free_pages_num--;
if (++num_pages == NUM_BATCH_FREE_PAGES) {
spin_unlock_irqrestore(&blkif->free_pages_lock, flags);
spin_unlock_irqrestore(&ring->free_pages_lock, flags);
gnttab_free_pages(num_pages, page);
spin_lock_irqsave(&blkif->free_pages_lock, flags);
spin_lock_irqsave(&ring->free_pages_lock, flags);
num_pages = 0;
}
}
spin_unlock_irqrestore(&blkif->free_pages_lock, flags);
spin_unlock_irqrestore(&ring->free_pages_lock, flags);
if (num_pages != 0)
gnttab_free_pages(num_pages, page);
}
#define vaddr(page) ((unsigned long)pfn_to_kaddr(page_to_pfn(page)))
static int do_block_io_op(struct xen_blkif *blkif);
static int dispatch_rw_block_io(struct xen_blkif *blkif,
static int do_block_io_op(struct xen_blkif_ring *ring);
static int dispatch_rw_block_io(struct xen_blkif_ring *ring,
struct blkif_request *req,
struct pending_req *pending_req);
static void make_response(struct xen_blkif *blkif, u64 id,
static void make_response(struct xen_blkif_ring *ring, u64 id,
unsigned short op, int st);
#define foreach_grant_safe(pos, n, rbtree, node) \
@ -190,7 +200,7 @@ static void make_response(struct xen_blkif *blkif, u64 id,
/*
* We don't need locking around the persistent grant helpers
* because blkback uses a single-thread for each backed, so we
* because blkback uses a single-thread for each backend, so we
* can be sure that this functions will never be called recursively.
*
* The only exception to that is put_persistent_grant, that can be called
@ -198,19 +208,20 @@ static void make_response(struct xen_blkif *blkif, u64 id,
* bit operations to modify the flags of a persistent grant and to count
* the number of used grants.
*/
static int add_persistent_gnt(struct xen_blkif *blkif,
static int add_persistent_gnt(struct xen_blkif_ring *ring,
struct persistent_gnt *persistent_gnt)
{
struct rb_node **new = NULL, *parent = NULL;
struct persistent_gnt *this;
struct xen_blkif *blkif = ring->blkif;
if (blkif->persistent_gnt_c >= xen_blkif_max_pgrants) {
if (ring->persistent_gnt_c >= xen_blkif_max_pgrants) {
if (!blkif->vbd.overflow_max_grants)
blkif->vbd.overflow_max_grants = 1;
return -EBUSY;
}
/* Figure out where to put new node */
new = &blkif->persistent_gnts.rb_node;
new = &ring->persistent_gnts.rb_node;
while (*new) {
this = container_of(*new, struct persistent_gnt, node);
@ -229,19 +240,19 @@ static int add_persistent_gnt(struct xen_blkif *blkif,
set_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags);
/* Add new node and rebalance tree. */
rb_link_node(&(persistent_gnt->node), parent, new);
rb_insert_color(&(persistent_gnt->node), &blkif->persistent_gnts);
blkif->persistent_gnt_c++;
atomic_inc(&blkif->persistent_gnt_in_use);
rb_insert_color(&(persistent_gnt->node), &ring->persistent_gnts);
ring->persistent_gnt_c++;
atomic_inc(&ring->persistent_gnt_in_use);
return 0;
}
static struct persistent_gnt *get_persistent_gnt(struct xen_blkif *blkif,
static struct persistent_gnt *get_persistent_gnt(struct xen_blkif_ring *ring,
grant_ref_t gref)
{
struct persistent_gnt *data;
struct rb_node *node = NULL;
node = blkif->persistent_gnts.rb_node;
node = ring->persistent_gnts.rb_node;
while (node) {
data = container_of(node, struct persistent_gnt, node);
@ -255,24 +266,24 @@ static struct persistent_gnt *get_persistent_gnt(struct xen_blkif *blkif,
return NULL;
}
set_bit(PERSISTENT_GNT_ACTIVE, data->flags);
atomic_inc(&blkif->persistent_gnt_in_use);
atomic_inc(&ring->persistent_gnt_in_use);
return data;
}
}
return NULL;
}
static void put_persistent_gnt(struct xen_blkif *blkif,
static void put_persistent_gnt(struct xen_blkif_ring *ring,
struct persistent_gnt *persistent_gnt)
{
if(!test_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags))
pr_alert_ratelimited("freeing a grant already unused\n");
set_bit(PERSISTENT_GNT_WAS_ACTIVE, persistent_gnt->flags);
clear_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags);
atomic_dec(&blkif->persistent_gnt_in_use);
atomic_dec(&ring->persistent_gnt_in_use);
}
static void free_persistent_gnts(struct xen_blkif *blkif, struct rb_root *root,
static void free_persistent_gnts(struct xen_blkif_ring *ring, struct rb_root *root,
unsigned int num)
{
struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
@ -303,7 +314,7 @@ static void free_persistent_gnts(struct xen_blkif *blkif, struct rb_root *root,
unmap_data.count = segs_to_unmap;
BUG_ON(gnttab_unmap_refs_sync(&unmap_data));
put_free_pages(blkif, pages, segs_to_unmap);
put_free_pages(ring, pages, segs_to_unmap);
segs_to_unmap = 0;
}
@ -320,15 +331,15 @@ void xen_blkbk_unmap_purged_grants(struct work_struct *work)
struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct persistent_gnt *persistent_gnt;
int segs_to_unmap = 0;
struct xen_blkif *blkif = container_of(work, typeof(*blkif), persistent_purge_work);
struct xen_blkif_ring *ring = container_of(work, typeof(*ring), persistent_purge_work);
struct gntab_unmap_queue_data unmap_data;
unmap_data.pages = pages;
unmap_data.unmap_ops = unmap;
unmap_data.kunmap_ops = NULL;
while(!list_empty(&blkif->persistent_purge_list)) {
persistent_gnt = list_first_entry(&blkif->persistent_purge_list,
while(!list_empty(&ring->persistent_purge_list)) {
persistent_gnt = list_first_entry(&ring->persistent_purge_list,
struct persistent_gnt,
remove_node);
list_del(&persistent_gnt->remove_node);
@ -343,7 +354,7 @@ void xen_blkbk_unmap_purged_grants(struct work_struct *work)
if (++segs_to_unmap == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
unmap_data.count = segs_to_unmap;
BUG_ON(gnttab_unmap_refs_sync(&unmap_data));
put_free_pages(blkif, pages, segs_to_unmap);
put_free_pages(ring, pages, segs_to_unmap);
segs_to_unmap = 0;
}
kfree(persistent_gnt);
@ -351,11 +362,11 @@ void xen_blkbk_unmap_purged_grants(struct work_struct *work)
if (segs_to_unmap > 0) {
unmap_data.count = segs_to_unmap;
BUG_ON(gnttab_unmap_refs_sync(&unmap_data));
put_free_pages(blkif, pages, segs_to_unmap);
put_free_pages(ring, pages, segs_to_unmap);
}
}
static void purge_persistent_gnt(struct xen_blkif *blkif)
static void purge_persistent_gnt(struct xen_blkif_ring *ring)
{
struct persistent_gnt *persistent_gnt;
struct rb_node *n;
@ -363,23 +374,23 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)
bool scan_used = false, clean_used = false;
struct rb_root *root;
if (blkif->persistent_gnt_c < xen_blkif_max_pgrants ||
(blkif->persistent_gnt_c == xen_blkif_max_pgrants &&
!blkif->vbd.overflow_max_grants)) {
return;
if (ring->persistent_gnt_c < xen_blkif_max_pgrants ||
(ring->persistent_gnt_c == xen_blkif_max_pgrants &&
!ring->blkif->vbd.overflow_max_grants)) {
goto out;
}
if (work_busy(&blkif->persistent_purge_work)) {
if (work_busy(&ring->persistent_purge_work)) {
pr_alert_ratelimited("Scheduled work from previous purge is still busy, cannot purge list\n");
return;
goto out;
}
num_clean = (xen_blkif_max_pgrants / 100) * LRU_PERCENT_CLEAN;
num_clean = blkif->persistent_gnt_c - xen_blkif_max_pgrants + num_clean;
num_clean = min(blkif->persistent_gnt_c, num_clean);
num_clean = ring->persistent_gnt_c - xen_blkif_max_pgrants + num_clean;
num_clean = min(ring->persistent_gnt_c, num_clean);
if ((num_clean == 0) ||
(num_clean > (blkif->persistent_gnt_c - atomic_read(&blkif->persistent_gnt_in_use))))
return;
(num_clean > (ring->persistent_gnt_c - atomic_read(&ring->persistent_gnt_in_use))))
goto out;
/*
* At this point, we can assure that there will be no calls
@ -394,8 +405,8 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)
pr_debug("Going to purge %u persistent grants\n", num_clean);
BUG_ON(!list_empty(&blkif->persistent_purge_list));
root = &blkif->persistent_gnts;
BUG_ON(!list_empty(&ring->persistent_purge_list));
root = &ring->persistent_gnts;
purge_list:
foreach_grant_safe(persistent_gnt, n, root, node) {
BUG_ON(persistent_gnt->handle ==
@ -414,7 +425,7 @@ purge_list:
rb_erase(&persistent_gnt->node, root);
list_add(&persistent_gnt->remove_node,
&blkif->persistent_purge_list);
&ring->persistent_purge_list);
if (--num_clean == 0)
goto finished;
}
@ -435,30 +446,32 @@ finished:
goto purge_list;
}
blkif->persistent_gnt_c -= (total - num_clean);
blkif->vbd.overflow_max_grants = 0;
ring->persistent_gnt_c -= (total - num_clean);
ring->blkif->vbd.overflow_max_grants = 0;
/* We can defer this work */
schedule_work(&blkif->persistent_purge_work);
schedule_work(&ring->persistent_purge_work);
pr_debug("Purged %u/%u\n", (total - num_clean), total);
out:
return;
}
/*
* Retrieve from the 'pending_reqs' a free pending_req structure to be used.
*/
static struct pending_req *alloc_req(struct xen_blkif *blkif)
static struct pending_req *alloc_req(struct xen_blkif_ring *ring)
{
struct pending_req *req = NULL;
unsigned long flags;
spin_lock_irqsave(&blkif->pending_free_lock, flags);
if (!list_empty(&blkif->pending_free)) {
req = list_entry(blkif->pending_free.next, struct pending_req,
spin_lock_irqsave(&ring->pending_free_lock, flags);
if (!list_empty(&ring->pending_free)) {
req = list_entry(ring->pending_free.next, struct pending_req,
free_list);
list_del(&req->free_list);
}
spin_unlock_irqrestore(&blkif->pending_free_lock, flags);
spin_unlock_irqrestore(&ring->pending_free_lock, flags);
return req;
}
@ -466,17 +479,17 @@ static struct pending_req *alloc_req(struct xen_blkif *blkif)
* Return the 'pending_req' structure back to the freepool. We also
* wake up the thread if it was waiting for a free page.
*/
static void free_req(struct xen_blkif *blkif, struct pending_req *req)
static void free_req(struct xen_blkif_ring *ring, struct pending_req *req)
{
unsigned long flags;
int was_empty;
spin_lock_irqsave(&blkif->pending_free_lock, flags);
was_empty = list_empty(&blkif->pending_free);
list_add(&req->free_list, &blkif->pending_free);
spin_unlock_irqrestore(&blkif->pending_free_lock, flags);
spin_lock_irqsave(&ring->pending_free_lock, flags);
was_empty = list_empty(&ring->pending_free);
list_add(&req->free_list, &ring->pending_free);
spin_unlock_irqrestore(&ring->pending_free_lock, flags);
if (was_empty)
wake_up(&blkif->pending_free_wq);
wake_up(&ring->pending_free_wq);
}
/*
@ -556,10 +569,10 @@ abort:
/*
* Notification from the guest OS.
*/
static void blkif_notify_work(struct xen_blkif *blkif)
static void blkif_notify_work(struct xen_blkif_ring *ring)
{
blkif->waiting_reqs = 1;
wake_up(&blkif->wq);
ring->waiting_reqs = 1;
wake_up(&ring->wq);
}
irqreturn_t xen_blkif_be_int(int irq, void *dev_id)
@ -572,31 +585,33 @@ irqreturn_t xen_blkif_be_int(int irq, void *dev_id)
* SCHEDULER FUNCTIONS
*/
static void print_stats(struct xen_blkif *blkif)
static void print_stats(struct xen_blkif_ring *ring)
{
pr_info("(%s): oo %3llu | rd %4llu | wr %4llu | f %4llu"
" | ds %4llu | pg: %4u/%4d\n",
current->comm, blkif->st_oo_req,
blkif->st_rd_req, blkif->st_wr_req,
blkif->st_f_req, blkif->st_ds_req,
blkif->persistent_gnt_c,
current->comm, ring->st_oo_req,
ring->st_rd_req, ring->st_wr_req,
ring->st_f_req, ring->st_ds_req,
ring->persistent_gnt_c,
xen_blkif_max_pgrants);
blkif->st_print = jiffies + msecs_to_jiffies(10 * 1000);
blkif->st_rd_req = 0;
blkif->st_wr_req = 0;
blkif->st_oo_req = 0;
blkif->st_ds_req = 0;
ring->st_print = jiffies + msecs_to_jiffies(10 * 1000);
ring->st_rd_req = 0;
ring->st_wr_req = 0;
ring->st_oo_req = 0;
ring->st_ds_req = 0;
}
int xen_blkif_schedule(void *arg)
{
struct xen_blkif *blkif = arg;
struct xen_blkif_ring *ring = arg;
struct xen_blkif *blkif = ring->blkif;
struct xen_vbd *vbd = &blkif->vbd;
unsigned long timeout;
int ret;
xen_blkif_get(blkif);
set_freezable();
while (!kthread_should_stop()) {
if (try_to_freeze())
continue;
@ -606,50 +621,50 @@ int xen_blkif_schedule(void *arg)
timeout = msecs_to_jiffies(LRU_INTERVAL);
timeout = wait_event_interruptible_timeout(
blkif->wq,
blkif->waiting_reqs || kthread_should_stop(),
ring->wq,
ring->waiting_reqs || kthread_should_stop(),
timeout);
if (timeout == 0)
goto purge_gnt_list;
timeout = wait_event_interruptible_timeout(
blkif->pending_free_wq,
!list_empty(&blkif->pending_free) ||
ring->pending_free_wq,
!list_empty(&ring->pending_free) ||
kthread_should_stop(),
timeout);
if (timeout == 0)
goto purge_gnt_list;
blkif->waiting_reqs = 0;
ring->waiting_reqs = 0;
smp_mb(); /* clear flag *before* checking for work */
ret = do_block_io_op(blkif);
ret = do_block_io_op(ring);
if (ret > 0)
blkif->waiting_reqs = 1;
ring->waiting_reqs = 1;
if (ret == -EACCES)
wait_event_interruptible(blkif->shutdown_wq,
wait_event_interruptible(ring->shutdown_wq,
kthread_should_stop());
purge_gnt_list:
if (blkif->vbd.feature_gnt_persistent &&
time_after(jiffies, blkif->next_lru)) {
purge_persistent_gnt(blkif);
blkif->next_lru = jiffies + msecs_to_jiffies(LRU_INTERVAL);
time_after(jiffies, ring->next_lru)) {
purge_persistent_gnt(ring);
ring->next_lru = jiffies + msecs_to_jiffies(LRU_INTERVAL);
}
/* Shrink if we have more than xen_blkif_max_buffer_pages */
shrink_free_pagepool(blkif, xen_blkif_max_buffer_pages);
shrink_free_pagepool(ring, xen_blkif_max_buffer_pages);
if (log_stats && time_after(jiffies, blkif->st_print))
print_stats(blkif);
if (log_stats && time_after(jiffies, ring->st_print))
print_stats(ring);
}
/* Drain pending purge work */
flush_work(&blkif->persistent_purge_work);
flush_work(&ring->persistent_purge_work);
if (log_stats)
print_stats(blkif);
print_stats(ring);
blkif->xenblkd = NULL;
ring->xenblkd = NULL;
xen_blkif_put(blkif);
return 0;
@ -658,22 +673,22 @@ purge_gnt_list:
/*
* Remove persistent grants and empty the pool of free pages
*/
void xen_blkbk_free_caches(struct xen_blkif *blkif)
void xen_blkbk_free_caches(struct xen_blkif_ring *ring)
{
/* Free all persistent grant pages */
if (!RB_EMPTY_ROOT(&blkif->persistent_gnts))
free_persistent_gnts(blkif, &blkif->persistent_gnts,
blkif->persistent_gnt_c);
if (!RB_EMPTY_ROOT(&ring->persistent_gnts))
free_persistent_gnts(ring, &ring->persistent_gnts,
ring->persistent_gnt_c);
BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
blkif->persistent_gnt_c = 0;
BUG_ON(!RB_EMPTY_ROOT(&ring->persistent_gnts));
ring->persistent_gnt_c = 0;
/* Since we are shutting down remove all pages from the buffer */
shrink_free_pagepool(blkif, 0 /* All */);
shrink_free_pagepool(ring, 0 /* All */);
}
static unsigned int xen_blkbk_unmap_prepare(
struct xen_blkif *blkif,
struct xen_blkif_ring *ring,
struct grant_page **pages,
unsigned int num,
struct gnttab_unmap_grant_ref *unmap_ops,
@ -683,7 +698,7 @@ static unsigned int xen_blkbk_unmap_prepare(
for (i = 0; i < num; i++) {
if (pages[i]->persistent_gnt != NULL) {
put_persistent_gnt(blkif, pages[i]->persistent_gnt);
put_persistent_gnt(ring, pages[i]->persistent_gnt);
continue;
}
if (pages[i]->handle == BLKBACK_INVALID_HANDLE)
@ -700,17 +715,18 @@ static unsigned int xen_blkbk_unmap_prepare(
static void xen_blkbk_unmap_and_respond_callback(int result, struct gntab_unmap_queue_data *data)
{
struct pending_req* pending_req = (struct pending_req*) (data->data);
struct xen_blkif *blkif = pending_req->blkif;
struct pending_req *pending_req = (struct pending_req *)(data->data);
struct xen_blkif_ring *ring = pending_req->ring;
struct xen_blkif *blkif = ring->blkif;
/* BUG_ON used to reproduce existing behaviour,
but is this the best way to deal with this? */
BUG_ON(result);
put_free_pages(blkif, data->pages, data->count);
make_response(blkif, pending_req->id,
put_free_pages(ring, data->pages, data->count);
make_response(ring, pending_req->id,
pending_req->operation, pending_req->status);
free_req(blkif, pending_req);
free_req(ring, pending_req);
/*
* Make sure the request is freed before releasing blkif,
* or there could be a race between free_req and the
@ -723,7 +739,7 @@ static void xen_blkbk_unmap_and_respond_callback(int result, struct gntab_unmap_
* pending_free_wq if there's a drain going on, but it has
* to be taken into account if the current model is changed.
*/
if (atomic_dec_and_test(&blkif->inflight) && atomic_read(&blkif->drain)) {
if (atomic_dec_and_test(&ring->inflight) && atomic_read(&blkif->drain)) {
complete(&blkif->drain_complete);
}
xen_blkif_put(blkif);
@ -732,11 +748,11 @@ static void xen_blkbk_unmap_and_respond_callback(int result, struct gntab_unmap_
static void xen_blkbk_unmap_and_respond(struct pending_req *req)
{
struct gntab_unmap_queue_data* work = &req->gnttab_unmap_data;
struct xen_blkif *blkif = req->blkif;
struct xen_blkif_ring *ring = req->ring;
struct grant_page **pages = req->segments;
unsigned int invcount;
invcount = xen_blkbk_unmap_prepare(blkif, pages, req->nr_segs,
invcount = xen_blkbk_unmap_prepare(ring, pages, req->nr_segs,
req->unmap, req->unmap_pages);
work->data = req;
@ -757,7 +773,7 @@ static void xen_blkbk_unmap_and_respond(struct pending_req *req)
* of hypercalls, but since this is only used in error paths there's
* no real need.
*/
static void xen_blkbk_unmap(struct xen_blkif *blkif,
static void xen_blkbk_unmap(struct xen_blkif_ring *ring,
struct grant_page *pages[],
int num)
{
@ -768,20 +784,20 @@ static void xen_blkbk_unmap(struct xen_blkif *blkif,
while (num) {
unsigned int batch = min(num, BLKIF_MAX_SEGMENTS_PER_REQUEST);
invcount = xen_blkbk_unmap_prepare(blkif, pages, batch,
invcount = xen_blkbk_unmap_prepare(ring, pages, batch,
unmap, unmap_pages);
if (invcount) {
ret = gnttab_unmap_refs(unmap, NULL, unmap_pages, invcount);
BUG_ON(ret);
put_free_pages(blkif, unmap_pages, invcount);
put_free_pages(ring, unmap_pages, invcount);
}
pages += batch;
num -= batch;
}
}
static int xen_blkbk_map(struct xen_blkif *blkif,
static int xen_blkbk_map(struct xen_blkif_ring *ring,
struct grant_page *pages[],
int num, bool ro)
{
@ -794,6 +810,7 @@ static int xen_blkbk_map(struct xen_blkif *blkif,
int ret = 0;
int last_map = 0, map_until = 0;
int use_persistent_gnts;
struct xen_blkif *blkif = ring->blkif;
use_persistent_gnts = (blkif->vbd.feature_gnt_persistent);
@ -806,10 +823,11 @@ again:
for (i = map_until; i < num; i++) {
uint32_t flags;
if (use_persistent_gnts)
if (use_persistent_gnts) {
persistent_gnt = get_persistent_gnt(
blkif,
ring,
pages[i]->gref);
}
if (persistent_gnt) {
/*
@ -819,7 +837,7 @@ again:
pages[i]->page = persistent_gnt->page;
pages[i]->persistent_gnt = persistent_gnt;
} else {
if (get_free_page(blkif, &pages[i]->page))
if (get_free_page(ring, &pages[i]->page))
goto out_of_memory;
addr = vaddr(pages[i]->page);
pages_to_gnt[segs_to_map] = pages[i]->page;
@ -852,7 +870,7 @@ again:
BUG_ON(new_map_idx >= segs_to_map);
if (unlikely(map[new_map_idx].status != 0)) {
pr_debug("invalid buffer -- could not remap it\n");
put_free_pages(blkif, &pages[seg_idx]->page, 1);
put_free_pages(ring, &pages[seg_idx]->page, 1);
pages[seg_idx]->handle = BLKBACK_INVALID_HANDLE;
ret |= 1;
goto next;
@ -862,7 +880,7 @@ again:
continue;
}
if (use_persistent_gnts &&
blkif->persistent_gnt_c < xen_blkif_max_pgrants) {
ring->persistent_gnt_c < xen_blkif_max_pgrants) {
/*
* We are using persistent grants, the grant is
* not mapped but we might have room for it.
@ -880,7 +898,7 @@ again:
persistent_gnt->gnt = map[new_map_idx].ref;
persistent_gnt->handle = map[new_map_idx].handle;
persistent_gnt->page = pages[seg_idx]->page;
if (add_persistent_gnt(blkif,
if (add_persistent_gnt(ring,
persistent_gnt)) {
kfree(persistent_gnt);
persistent_gnt = NULL;
@ -888,7 +906,7 @@ again:
}
pages[seg_idx]->persistent_gnt = persistent_gnt;
pr_debug("grant %u added to the tree of persistent grants, using %u/%u\n",
persistent_gnt->gnt, blkif->persistent_gnt_c,
persistent_gnt->gnt, ring->persistent_gnt_c,
xen_blkif_max_pgrants);
goto next;
}
@ -913,7 +931,7 @@ next:
out_of_memory:
pr_alert("%s: out of memory\n", __func__);
put_free_pages(blkif, pages_to_gnt, segs_to_map);
put_free_pages(ring, pages_to_gnt, segs_to_map);
return -ENOMEM;
}
@ -921,7 +939,7 @@ static int xen_blkbk_map_seg(struct pending_req *pending_req)
{
int rc;
rc = xen_blkbk_map(pending_req->blkif, pending_req->segments,
rc = xen_blkbk_map(pending_req->ring, pending_req->segments,
pending_req->nr_segs,
(pending_req->operation != BLKIF_OP_READ));
@ -934,7 +952,7 @@ static int xen_blkbk_parse_indirect(struct blkif_request *req,
struct phys_req *preq)
{
struct grant_page **pages = pending_req->indirect_pages;
struct xen_blkif *blkif = pending_req->blkif;
struct xen_blkif_ring *ring = pending_req->ring;
int indirect_grefs, rc, n, nseg, i;
struct blkif_request_segment *segments = NULL;
@ -945,7 +963,7 @@ static int xen_blkbk_parse_indirect(struct blkif_request *req,
for (i = 0; i < indirect_grefs; i++)
pages[i]->gref = req->u.indirect.indirect_grefs[i];
rc = xen_blkbk_map(blkif, pages, indirect_grefs, true);
rc = xen_blkbk_map(ring, pages, indirect_grefs, true);
if (rc)
goto unmap;
@ -977,15 +995,16 @@ static int xen_blkbk_parse_indirect(struct blkif_request *req,
unmap:
if (segments)
kunmap_atomic(segments);
xen_blkbk_unmap(blkif, pages, indirect_grefs);
xen_blkbk_unmap(ring, pages, indirect_grefs);
return rc;
}
static int dispatch_discard_io(struct xen_blkif *blkif,
static int dispatch_discard_io(struct xen_blkif_ring *ring,
struct blkif_request *req)
{
int err = 0;
int status = BLKIF_RSP_OKAY;
struct xen_blkif *blkif = ring->blkif;
struct block_device *bdev = blkif->vbd.bdev;
unsigned long secure;
struct phys_req preq;
@ -1002,7 +1021,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
preq.sector_number + preq.nr_sects, blkif->vbd.pdevice);
goto fail_response;
}
blkif->st_ds_req++;
ring->st_ds_req++;
secure = (blkif->vbd.discard_secure &&
(req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
@ -1018,26 +1037,28 @@ fail_response:
} else if (err)
status = BLKIF_RSP_ERROR;
make_response(blkif, req->u.discard.id, req->operation, status);
make_response(ring, req->u.discard.id, req->operation, status);
xen_blkif_put(blkif);
return err;
}
static int dispatch_other_io(struct xen_blkif *blkif,
static int dispatch_other_io(struct xen_blkif_ring *ring,
struct blkif_request *req,
struct pending_req *pending_req)
{
free_req(blkif, pending_req);
make_response(blkif, req->u.other.id, req->operation,
free_req(ring, pending_req);
make_response(ring, req->u.other.id, req->operation,
BLKIF_RSP_EOPNOTSUPP);
return -EIO;
}
static void xen_blk_drain_io(struct xen_blkif *blkif)
static void xen_blk_drain_io(struct xen_blkif_ring *ring)
{
struct xen_blkif *blkif = ring->blkif;
atomic_set(&blkif->drain, 1);
do {
if (atomic_read(&blkif->inflight) == 0)
if (atomic_read(&ring->inflight) == 0)
break;
wait_for_completion_interruptible_timeout(
&blkif->drain_complete, HZ);
@ -1058,12 +1079,12 @@ static void __end_block_io_op(struct pending_req *pending_req, int error)
if ((pending_req->operation == BLKIF_OP_FLUSH_DISKCACHE) &&
(error == -EOPNOTSUPP)) {
pr_debug("flush diskcache op failed, not supported\n");
xen_blkbk_flush_diskcache(XBT_NIL, pending_req->blkif->be, 0);
xen_blkbk_flush_diskcache(XBT_NIL, pending_req->ring->blkif->be, 0);
pending_req->status = BLKIF_RSP_EOPNOTSUPP;
} else if ((pending_req->operation == BLKIF_OP_WRITE_BARRIER) &&
(error == -EOPNOTSUPP)) {
pr_debug("write barrier op failed, not supported\n");
xen_blkbk_barrier(XBT_NIL, pending_req->blkif->be, 0);
xen_blkbk_barrier(XBT_NIL, pending_req->ring->blkif->be, 0);
pending_req->status = BLKIF_RSP_EOPNOTSUPP;
} else if (error) {
pr_debug("Buffer not up-to-date at end of operation,"
@ -1097,9 +1118,9 @@ static void end_block_io_op(struct bio *bio)
* and transmute it to the block API to hand it over to the proper block disk.
*/
static int
__do_block_io_op(struct xen_blkif *blkif)
__do_block_io_op(struct xen_blkif_ring *ring)
{
union blkif_back_rings *blk_rings = &blkif->blk_rings;
union blkif_back_rings *blk_rings = &ring->blk_rings;
struct blkif_request req;
struct pending_req *pending_req;
RING_IDX rc, rp;
@ -1112,7 +1133,7 @@ __do_block_io_op(struct xen_blkif *blkif)
if (RING_REQUEST_PROD_OVERFLOW(&blk_rings->common, rp)) {
rc = blk_rings->common.rsp_prod_pvt;
pr_warn("Frontend provided bogus ring requests (%d - %d = %d). Halting ring processing on dev=%04x\n",
rp, rc, rp - rc, blkif->vbd.pdevice);
rp, rc, rp - rc, ring->blkif->vbd.pdevice);
return -EACCES;
}
while (rc != rp) {
@ -1125,14 +1146,14 @@ __do_block_io_op(struct xen_blkif *blkif)
break;
}
pending_req = alloc_req(blkif);
pending_req = alloc_req(ring);
if (NULL == pending_req) {
blkif->st_oo_req++;
ring->st_oo_req++;
more_to_do = 1;
break;
}
switch (blkif->blk_protocol) {
switch (ring->blkif->blk_protocol) {
case BLKIF_PROTOCOL_NATIVE:
memcpy(&req, RING_GET_REQUEST(&blk_rings->native, rc), sizeof(req));
break;
@ -1156,16 +1177,16 @@ __do_block_io_op(struct xen_blkif *blkif)
case BLKIF_OP_WRITE_BARRIER:
case BLKIF_OP_FLUSH_DISKCACHE:
case BLKIF_OP_INDIRECT:
if (dispatch_rw_block_io(blkif, &req, pending_req))
if (dispatch_rw_block_io(ring, &req, pending_req))
goto done;
break;
case BLKIF_OP_DISCARD:
free_req(blkif, pending_req);
if (dispatch_discard_io(blkif, &req))
free_req(ring, pending_req);
if (dispatch_discard_io(ring, &req))
goto done;
break;
default:
if (dispatch_other_io(blkif, &req, pending_req))
if (dispatch_other_io(ring, &req, pending_req))
goto done;
break;
}
@ -1178,13 +1199,13 @@ done:
}
static int
do_block_io_op(struct xen_blkif *blkif)
do_block_io_op(struct xen_blkif_ring *ring)
{
union blkif_back_rings *blk_rings = &blkif->blk_rings;
union blkif_back_rings *blk_rings = &ring->blk_rings;
int more_to_do;
do {
more_to_do = __do_block_io_op(blkif);
more_to_do = __do_block_io_op(ring);
if (more_to_do)
break;
@ -1197,7 +1218,7 @@ do_block_io_op(struct xen_blkif *blkif)
* Transmutation of the 'struct blkif_request' to a proper 'struct bio'
* and call the 'submit_bio' to pass it to the underlying storage.
*/
static int dispatch_rw_block_io(struct xen_blkif *blkif,
static int dispatch_rw_block_io(struct xen_blkif_ring *ring,
struct blkif_request *req,
struct pending_req *pending_req)
{
@ -1225,17 +1246,17 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
switch (req_operation) {
case BLKIF_OP_READ:
blkif->st_rd_req++;
ring->st_rd_req++;
operation = READ;
break;
case BLKIF_OP_WRITE:
blkif->st_wr_req++;
ring->st_wr_req++;
operation = WRITE_ODIRECT;
break;
case BLKIF_OP_WRITE_BARRIER:
drain = true;
case BLKIF_OP_FLUSH_DISKCACHE:
blkif->st_f_req++;
ring->st_f_req++;
operation = WRITE_FLUSH;
break;
default:
@ -1260,7 +1281,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
preq.nr_sects = 0;
pending_req->blkif = blkif;
pending_req->ring = ring;
pending_req->id = req->u.rw.id;
pending_req->operation = req_operation;
pending_req->status = BLKIF_RSP_OKAY;
@ -1287,12 +1308,12 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
goto fail_response;
}
if (xen_vbd_translate(&preq, blkif, operation) != 0) {
if (xen_vbd_translate(&preq, ring->blkif, operation) != 0) {
pr_debug("access denied: %s of [%llu,%llu] on dev=%04x\n",
operation == READ ? "read" : "write",
preq.sector_number,
preq.sector_number + preq.nr_sects,
blkif->vbd.pdevice);
ring->blkif->vbd.pdevice);
goto fail_response;
}
@ -1304,7 +1325,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
if (((int)preq.sector_number|(int)seg[i].nsec) &
((bdev_logical_block_size(preq.bdev) >> 9) - 1)) {
pr_debug("Misaligned I/O request from domain %d\n",
blkif->domid);
ring->blkif->domid);
goto fail_response;
}
}
@ -1313,7 +1334,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
* issue the WRITE_FLUSH.
*/
if (drain)
xen_blk_drain_io(pending_req->blkif);
xen_blk_drain_io(pending_req->ring);
/*
* If we have failed at this point, we need to undo the M2P override,
@ -1328,8 +1349,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
* This corresponding xen_blkif_put is done in __end_block_io_op, or
* below (in "!bio") if we are handling a BLKIF_OP_DISCARD.
*/
xen_blkif_get(blkif);
atomic_inc(&blkif->inflight);
xen_blkif_get(ring->blkif);
atomic_inc(&ring->inflight);
for (i = 0; i < nseg; i++) {
while ((bio == NULL) ||
@ -1377,19 +1398,19 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
blk_finish_plug(&plug);
if (operation == READ)
blkif->st_rd_sect += preq.nr_sects;
ring->st_rd_sect += preq.nr_sects;
else if (operation & WRITE)
blkif->st_wr_sect += preq.nr_sects;
ring->st_wr_sect += preq.nr_sects;
return 0;
fail_flush:
xen_blkbk_unmap(blkif, pending_req->segments,
xen_blkbk_unmap(ring, pending_req->segments,
pending_req->nr_segs);
fail_response:
/* Haven't submitted any bio's yet. */
make_response(blkif, req->u.rw.id, req_operation, BLKIF_RSP_ERROR);
free_req(blkif, pending_req);
make_response(ring, req->u.rw.id, req_operation, BLKIF_RSP_ERROR);
free_req(ring, pending_req);
msleep(1); /* back off a bit */
return -EIO;
@ -1407,21 +1428,22 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
/*
* Put a response on the ring on how the operation fared.
*/
static void make_response(struct xen_blkif *blkif, u64 id,
static void make_response(struct xen_blkif_ring *ring, u64 id,
unsigned short op, int st)
{
struct blkif_response resp;
unsigned long flags;
union blkif_back_rings *blk_rings = &blkif->blk_rings;
union blkif_back_rings *blk_rings;
int notify;
resp.id = id;
resp.operation = op;
resp.status = st;
spin_lock_irqsave(&blkif->blk_ring_lock, flags);
spin_lock_irqsave(&ring->blk_ring_lock, flags);
blk_rings = &ring->blk_rings;
/* Place on the response ring for the relevant domain. */
switch (blkif->blk_protocol) {
switch (ring->blkif->blk_protocol) {
case BLKIF_PROTOCOL_NATIVE:
memcpy(RING_GET_RESPONSE(&blk_rings->native, blk_rings->native.rsp_prod_pvt),
&resp, sizeof(resp));
@ -1439,9 +1461,9 @@ static void make_response(struct xen_blkif *blkif, u64 id,
}
blk_rings->common.rsp_prod_pvt++;
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blk_rings->common, notify);
spin_unlock_irqrestore(&blkif->blk_ring_lock, flags);
spin_unlock_irqrestore(&ring->blk_ring_lock, flags);
if (notify)
notify_remote_via_irq(blkif->irq);
notify_remote_via_irq(ring->irq);
}
static int __init xen_blkif_init(void)
@ -1457,6 +1479,9 @@ static int __init xen_blkif_init(void)
xen_blkif_max_ring_order = XENBUS_MAX_RING_GRANT_ORDER;
}
if (xenblk_max_queues == 0)
xenblk_max_queues = num_online_cpus();
rc = xen_blkif_interface_init();
if (rc)
goto failed_init;

94
drivers/block/xen-blkback/common.h
Просмотреть файл

@ -46,6 +46,7 @@
#include <xen/interface/io/protocols.h>
extern unsigned int xen_blkif_max_ring_order;
extern unsigned int xenblk_max_queues;
/*
* This is the maximum number of segments that would be allowed in indirect
* requests. This value will also be passed to the frontend.
@ -269,68 +270,79 @@ struct persistent_gnt {
struct list_head remove_node;
};
struct xen_blkif {
/* Unique identifier for this interface. */
domid_t domid;
unsigned int handle;
/* Per-ring information. */
struct xen_blkif_ring {
/* Physical parameters of the comms window. */
unsigned int irq;
/* Comms information. */
enum blkif_protocol blk_protocol;
union blkif_back_rings blk_rings;
void *blk_ring;
/* The VBD attached to this interface. */
struct xen_vbd vbd;
/* Back pointer to the backend_info. */
struct backend_info *be;
/* Private fields. */
spinlock_t blk_ring_lock;
atomic_t refcnt;
wait_queue_head_t wq;
/* for barrier (drain) requests */
struct completion drain_complete;
atomic_t drain;
atomic_t inflight;
/* One thread per one blkif. */
/* One thread per blkif ring. */
struct task_struct *xenblkd;
unsigned int waiting_reqs;
/* tree to store persistent grants */
struct rb_root persistent_gnts;
unsigned int persistent_gnt_c;
atomic_t persistent_gnt_in_use;
unsigned long next_lru;
/* used by the kworker that offload work from the persistent purge */
struct list_head persistent_purge_list;
struct work_struct persistent_purge_work;
/* buffer of free pages to map grant refs */
spinlock_t free_pages_lock;
int free_pages_num;
struct list_head free_pages;
/* List of all 'pending_req' available */
struct list_head pending_free;
/* And its spinlock. */
spinlock_t pending_free_lock;
wait_queue_head_t pending_free_wq;
/* statistics */
/* Tree to store persistent grants. */
spinlock_t pers_gnts_lock;
struct rb_root persistent_gnts;
unsigned int persistent_gnt_c;
atomic_t persistent_gnt_in_use;
unsigned long next_lru;
/* Statistics. */
unsigned long st_print;
unsigned long long st_rd_req;
unsigned long long st_wr_req;
unsigned long long st_oo_req;
unsigned long long st_f_req;
unsigned long long st_ds_req;
unsigned long long st_rd_sect;
unsigned long long st_wr_sect;
unsigned long long st_rd_req;
unsigned long long st_wr_req;
unsigned long long st_oo_req;
unsigned long long st_f_req;
unsigned long long st_ds_req;
unsigned long long st_rd_sect;
unsigned long long st_wr_sect;
/* Used by the kworker that offload work from the persistent purge. */
struct list_head persistent_purge_list;
struct work_struct persistent_purge_work;
/* Buffer of free pages to map grant refs. */
spinlock_t free_pages_lock;
int free_pages_num;
struct list_head free_pages;
struct work_struct free_work;
/* Thread shutdown wait queue. */
wait_queue_head_t shutdown_wq;
unsigned int nr_ring_pages;
struct xen_blkif *blkif;
};
struct xen_blkif {
/* Unique identifier for this interface. */
domid_t domid;
unsigned int handle;
/* Comms information. */
enum blkif_protocol blk_protocol;
/* The VBD attached to this interface. */
struct xen_vbd vbd;
/* Back pointer to the backend_info. */
struct backend_info *be;
atomic_t refcnt;
/* for barrier (drain) requests */
struct completion drain_complete;
atomic_t drain;
struct work_struct free_work;
unsigned int nr_ring_pages;
/* All rings for this device. */
struct xen_blkif_ring *rings;
unsigned int nr_rings;
};
struct seg_buf {
@ -352,7 +364,7 @@ struct grant_page {
* response queued for it, with the saved 'id' passed back.
*/
struct pending_req {
struct xen_blkif *blkif;
struct xen_blkif_ring *ring;
u64 id;
int nr_segs;
atomic_t pendcnt;
@ -394,7 +406,7 @@ int xen_blkif_xenbus_init(void);
irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
int xen_blkif_schedule(void *arg);
int xen_blkif_purge_persistent(void *arg);
void xen_blkbk_free_caches(struct xen_blkif *blkif);
void xen_blkbk_free_caches(struct xen_blkif_ring *ring);
int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
struct backend_info *be, int state);

432
drivers/block/xen-blkback/xenbus.c
Просмотреть файл

@ -86,9 +86,11 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
{
int err;
char name[BLKBACK_NAME_LEN];
struct xen_blkif_ring *ring;
int i;
/* Not ready to connect? */
if (!blkif->irq || !blkif->vbd.bdev)
if (!blkif->rings || !blkif->rings[0].irq || !blkif->vbd.bdev)
return;
/* Already connected? */
@ -113,13 +115,55 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
}
invalidate_inode_pages2(blkif->vbd.bdev->bd_inode->i_mapping);
blkif->xenblkd = kthread_run(xen_blkif_schedule, blkif, "%s", name);
if (IS_ERR(blkif->xenblkd)) {
err = PTR_ERR(blkif->xenblkd);
blkif->xenblkd = NULL;
xenbus_dev_error(blkif->be->dev, err, "start xenblkd");
return;
for (i = 0; i < blkif->nr_rings; i++) {
ring = &blkif->rings[i];
ring->xenblkd = kthread_run(xen_blkif_schedule, ring, "%s-%d", name, i);
if (IS_ERR(ring->xenblkd)) {
err = PTR_ERR(ring->xenblkd);
ring->xenblkd = NULL;
xenbus_dev_fatal(blkif->be->dev, err,
"start %s-%d xenblkd", name, i);
goto out;
}
}
return;
out:
while (--i >= 0) {
ring = &blkif->rings[i];
kthread_stop(ring->xenblkd);
}
return;
}
static int xen_blkif_alloc_rings(struct xen_blkif *blkif)
{
unsigned int r;
blkif->rings = kzalloc(blkif->nr_rings * sizeof(struct xen_blkif_ring), GFP_KERNEL);
if (!blkif->rings)
return -ENOMEM;
for (r = 0; r < blkif->nr_rings; r++) {
struct xen_blkif_ring *ring = &blkif->rings[r];
spin_lock_init(&ring->blk_ring_lock);
init_waitqueue_head(&ring->wq);
INIT_LIST_HEAD(&ring->pending_free);
INIT_LIST_HEAD(&ring->persistent_purge_list);
INIT_WORK(&ring->persistent_purge_work, xen_blkbk_unmap_purged_grants);
spin_lock_init(&ring->free_pages_lock);
INIT_LIST_HEAD(&ring->free_pages);
spin_lock_init(&ring->pending_free_lock);
init_waitqueue_head(&ring->pending_free_wq);
init_waitqueue_head(&ring->shutdown_wq);
ring->blkif = blkif;
ring->st_print = jiffies;
xen_blkif_get(blkif);
}
return 0;
}
static struct xen_blkif *xen_blkif_alloc(domid_t domid)
@ -133,41 +177,25 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
return ERR_PTR(-ENOMEM);
blkif->domid = domid;
spin_lock_init(&blkif->blk_ring_lock);
atomic_set(&blkif->refcnt, 1);
init_waitqueue_head(&blkif->wq);
init_completion(&blkif->drain_complete);
atomic_set(&blkif->drain, 0);
blkif->st_print = jiffies;
blkif->persistent_gnts.rb_node = NULL;
spin_lock_init(&blkif->free_pages_lock);
INIT_LIST_HEAD(&blkif->free_pages);
INIT_LIST_HEAD(&blkif->persistent_purge_list);
blkif->free_pages_num = 0;
atomic_set(&blkif->persistent_gnt_in_use, 0);
atomic_set(&blkif->inflight, 0);
INIT_WORK(&blkif->persistent_purge_work, xen_blkbk_unmap_purged_grants);
INIT_LIST_HEAD(&blkif->pending_free);
INIT_WORK(&blkif->free_work, xen_blkif_deferred_free);
spin_lock_init(&blkif->pending_free_lock);
init_waitqueue_head(&blkif->pending_free_wq);
init_waitqueue_head(&blkif->shutdown_wq);
return blkif;
}
static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t *gref,
static int xen_blkif_map(struct xen_blkif_ring *ring, grant_ref_t *gref,
unsigned int nr_grefs, unsigned int evtchn)
{
int err;
struct xen_blkif *blkif = ring->blkif;
/* Already connected through? */
if (blkif->irq)
if (ring->irq)
return 0;
err = xenbus_map_ring_valloc(blkif->be->dev, gref, nr_grefs,
&blkif->blk_ring);
&ring->blk_ring);
if (err < 0)
return err;
@ -175,24 +203,24 @@ static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t *gref,
case BLKIF_PROTOCOL_NATIVE:
{
struct blkif_sring *sring;
sring = (struct blkif_sring *)blkif->blk_ring;
BACK_RING_INIT(&blkif->blk_rings.native, sring,
sring = (struct blkif_sring *)ring->blk_ring;
BACK_RING_INIT(&ring->blk_rings.native, sring,
XEN_PAGE_SIZE * nr_grefs);
break;
}
case BLKIF_PROTOCOL_X86_32:
{
struct blkif_x86_32_sring *sring_x86_32;
sring_x86_32 = (struct blkif_x86_32_sring *)blkif->blk_ring;
BACK_RING_INIT(&blkif->blk_rings.x86_32, sring_x86_32,
sring_x86_32 = (struct blkif_x86_32_sring *)ring->blk_ring;
BACK_RING_INIT(&ring->blk_rings.x86_32, sring_x86_32,
XEN_PAGE_SIZE * nr_grefs);
break;
}
case BLKIF_PROTOCOL_X86_64:
{
struct blkif_x86_64_sring *sring_x86_64;
sring_x86_64 = (struct blkif_x86_64_sring *)blkif->blk_ring;
BACK_RING_INIT(&blkif->blk_rings.x86_64, sring_x86_64,
sring_x86_64 = (struct blkif_x86_64_sring *)ring->blk_ring;
BACK_RING_INIT(&ring->blk_rings.x86_64, sring_x86_64,
XEN_PAGE_SIZE * nr_grefs);
break;
}
@ -202,13 +230,13 @@ static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t *gref,
err = bind_interdomain_evtchn_to_irqhandler(blkif->domid, evtchn,
xen_blkif_be_int, 0,
"blkif-backend", blkif);
"blkif-backend", ring);
if (err < 0) {
xenbus_unmap_ring_vfree(blkif->be->dev, blkif->blk_ring);
blkif->blk_rings.common.sring = NULL;
xenbus_unmap_ring_vfree(blkif->be->dev, ring->blk_ring);
ring->blk_rings.common.sring = NULL;
return err;
}
blkif->irq = err;
ring->irq = err;
return 0;
}
@ -216,50 +244,69 @@ static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t *gref,
static int xen_blkif_disconnect(struct xen_blkif *blkif)
{
struct pending_req *req, *n;
int i = 0, j;
unsigned int j, r;
if (blkif->xenblkd) {
kthread_stop(blkif->xenblkd);
wake_up(&blkif->shutdown_wq);
blkif->xenblkd = NULL;
for (r = 0; r < blkif->nr_rings; r++) {
struct xen_blkif_ring *ring = &blkif->rings[r];
unsigned int i = 0;
if (ring->xenblkd) {
kthread_stop(ring->xenblkd);
wake_up(&ring->shutdown_wq);
ring->xenblkd = NULL;
}
/* The above kthread_stop() guarantees that at this point we
* don't have any discard_io or other_io requests. So, checking
* for inflight IO is enough.
*/
if (atomic_read(&ring->inflight) > 0)
return -EBUSY;
if (ring->irq) {
unbind_from_irqhandler(ring->irq, ring);
ring->irq = 0;
}
if (ring->blk_rings.common.sring) {
xenbus_unmap_ring_vfree(blkif->be->dev, ring->blk_ring);
ring->blk_rings.common.sring = NULL;
}
/* Remove all persistent grants and the cache of ballooned pages. */
xen_blkbk_free_caches(ring);
/* Check that there is no request in use */
list_for_each_entry_safe(req, n, &ring->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++)
kfree(req->segments[j]);
for (j = 0; j < MAX_INDIRECT_PAGES; j++)
kfree(req->indirect_pages[j]);
kfree(req);
i++;
}
BUG_ON(atomic_read(&ring->persistent_gnt_in_use) != 0);
BUG_ON(!list_empty(&ring->persistent_purge_list));
BUG_ON(!RB_EMPTY_ROOT(&ring->persistent_gnts));
BUG_ON(!list_empty(&ring->free_pages));
BUG_ON(ring->free_pages_num != 0);
BUG_ON(ring->persistent_gnt_c != 0);
WARN_ON(i != (XEN_BLKIF_REQS_PER_PAGE * blkif->nr_ring_pages));
xen_blkif_put(blkif);
}
/* The above kthread_stop() guarantees that at this point we
* don't have any discard_io or other_io requests. So, checking
* for inflight IO is enough.
*/
if (atomic_read(&blkif->inflight) > 0)
return -EBUSY;
if (blkif->irq) {
unbind_from_irqhandler(blkif->irq, blkif);
blkif->irq = 0;
}
if (blkif->blk_rings.common.sring) {
xenbus_unmap_ring_vfree(blkif->be->dev, blkif->blk_ring);
blkif->blk_rings.common.sring = NULL;
}
/* Remove all persistent grants and the cache of ballooned pages. */
xen_blkbk_free_caches(blkif);
/* Check that there is no request in use */
list_for_each_entry_safe(req, n, &blkif->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++)
kfree(req->segments[j]);
for (j = 0; j < MAX_INDIRECT_PAGES; j++)
kfree(req->indirect_pages[j]);
kfree(req);
i++;
}
WARN_ON(i != (XEN_BLKIF_REQS_PER_PAGE * blkif->nr_ring_pages));
blkif->nr_ring_pages = 0;
/*
* blkif->rings was allocated in connect_ring, so we should free it in
* here.
*/
kfree(blkif->rings);
blkif->rings = NULL;
blkif->nr_rings = 0;
return 0;
}
@ -271,13 +318,6 @@ static void xen_blkif_free(struct xen_blkif *blkif)
xen_vbd_free(&blkif->vbd);
/* Make sure everything is drained before shutting down */
BUG_ON(blkif->persistent_gnt_c != 0);
BUG_ON(atomic_read(&blkif->persistent_gnt_in_use) != 0);
BUG_ON(blkif->free_pages_num != 0);
BUG_ON(!list_empty(&blkif->persistent_purge_list));
BUG_ON(!list_empty(&blkif->free_pages));
BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
kmem_cache_free(xen_blkif_cachep, blkif);
}
@ -296,25 +336,38 @@ int __init xen_blkif_interface_init(void)
* sysfs interface for VBD I/O requests
*/
#define VBD_SHOW(name, format, args...) \
#define VBD_SHOW_ALLRING(name, format) \
static ssize_t show_##name(struct device *_dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct xenbus_device *dev = to_xenbus_device(_dev); \
struct backend_info *be = dev_get_drvdata(&dev->dev); \
struct xen_blkif *blkif = be->blkif; \
unsigned int i; \
unsigned long long result = 0; \
\
return sprintf(buf, format, ##args); \
if (!blkif->rings) \
goto out; \
\
for (i = 0; i < blkif->nr_rings; i++) { \
struct xen_blkif_ring *ring = &blkif->rings[i]; \
\
result += ring->st_##name; \
} \
\
out: \
return sprintf(buf, format, result); \
} \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
VBD_SHOW(oo_req, "%llu\n", be->blkif->st_oo_req);
VBD_SHOW(rd_req, "%llu\n", be->blkif->st_rd_req);
VBD_SHOW(wr_req, "%llu\n", be->blkif->st_wr_req);
VBD_SHOW(f_req, "%llu\n", be->blkif->st_f_req);
VBD_SHOW(ds_req, "%llu\n", be->blkif->st_ds_req);
VBD_SHOW(rd_sect, "%llu\n", be->blkif->st_rd_sect);
VBD_SHOW(wr_sect, "%llu\n", be->blkif->st_wr_sect);
VBD_SHOW_ALLRING(oo_req, "%llu\n");
VBD_SHOW_ALLRING(rd_req, "%llu\n");
VBD_SHOW_ALLRING(wr_req, "%llu\n");
VBD_SHOW_ALLRING(f_req, "%llu\n");
VBD_SHOW_ALLRING(ds_req, "%llu\n");
VBD_SHOW_ALLRING(rd_sect, "%llu\n");
VBD_SHOW_ALLRING(wr_sect, "%llu\n");
static struct attribute *xen_vbdstat_attrs[] = {
&dev_attr_oo_req.attr,
@ -332,6 +385,18 @@ static struct attribute_group xen_vbdstat_group = {
.attrs = xen_vbdstat_attrs,
};
#define VBD_SHOW(name, format, args...) \
static ssize_t show_##name(struct device *_dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct xenbus_device *dev = to_xenbus_device(_dev); \
struct backend_info *be = dev_get_drvdata(&dev->dev); \
\
return sprintf(buf, format, ##args); \
} \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
VBD_SHOW(physical_device, "%x:%x\n", be->major, be->minor);
VBD_SHOW(mode, "%s\n", be->mode);
@ -440,11 +505,11 @@ static int xen_blkbk_remove(struct xenbus_device *dev)
dev_set_drvdata(&dev->dev, NULL);
if (be->blkif) {
if (be->blkif)
xen_blkif_disconnect(be->blkif);
xen_blkif_put(be->blkif);
}
/* Put the reference we set in xen_blkif_alloc(). */
xen_blkif_put(be->blkif);
kfree(be->mode);
kfree(be);
return 0;
@ -553,6 +618,12 @@ static int xen_blkbk_probe(struct xenbus_device *dev,
goto fail;
}
/* Multi-queue: advertise how many queues are supported by us.*/
err = xenbus_printf(XBT_NIL, dev->nodename,
"multi-queue-max-queues", "%u", xenblk_max_queues);
if (err)
pr_warn("Error writing multi-queue-max-queues\n");
/* setup back pointer */
be->blkif->be = be;
@ -708,8 +779,14 @@ static void frontend_changed(struct xenbus_device *dev,
}
err = connect_ring(be);
if (err)
if (err) {
/*
* Clean up so that memory resources can be used by
* other devices. connect_ring reported already error.
*/
xen_blkif_disconnect(be->blkif);
break;
}
xen_update_blkif_status(be->blkif);
break;
@ -825,50 +902,43 @@ again:
xenbus_transaction_end(xbt, 1);
}
static int connect_ring(struct backend_info *be)
/*
* Each ring may have multi pages, depends on "ring-page-order".
*/
static int read_per_ring_refs(struct xen_blkif_ring *ring, const char *dir)
{
struct xenbus_device *dev = be->dev;
unsigned int ring_ref[XENBUS_MAX_RING_GRANTS];
unsigned int evtchn, nr_grefs, ring_page_order;
unsigned int pers_grants;
char protocol[64] = "";
struct pending_req *req, *n;
int err, i, j;
struct xen_blkif *blkif = ring->blkif;
struct xenbus_device *dev = blkif->be->dev;
unsigned int ring_page_order, nr_grefs, evtchn;
pr_debug("%s %s\n", __func__, dev->otherend);
err = xenbus_scanf(XBT_NIL, dev->otherend, "event-channel", "%u",
err = xenbus_scanf(XBT_NIL, dir, "event-channel", "%u",
&evtchn);
if (err != 1) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "reading %s/event-channel",
dev->otherend);
xenbus_dev_fatal(dev, err, "reading %s/event-channel", dir);
return err;
}
pr_info("event-channel %u\n", evtchn);
err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-page-order", "%u",
&ring_page_order);
if (err != 1) {
err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-ref",
"%u", &ring_ref[0]);
err = xenbus_scanf(XBT_NIL, dir, "ring-ref", "%u", &ring_ref[0]);
if (err != 1) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "reading %s/ring-ref",
dev->otherend);
xenbus_dev_fatal(dev, err, "reading %s/ring-ref", dir);
return err;
}
nr_grefs = 1;
pr_info("%s:using single page: ring-ref %d\n", dev->otherend,
ring_ref[0]);
} else {
unsigned int i;
if (ring_page_order > xen_blkif_max_ring_order) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "%s/request %d ring page order exceed max:%d",
dev->otherend, ring_page_order,
dir, ring_page_order,
xen_blkif_max_ring_order);
return err;
}
@ -878,52 +948,23 @@ static int connect_ring(struct backend_info *be)
char ring_ref_name[RINGREF_NAME_LEN];
snprintf(ring_ref_name, RINGREF_NAME_LEN, "ring-ref%u", i);
err = xenbus_scanf(XBT_NIL, dev->otherend, ring_ref_name,
err = xenbus_scanf(XBT_NIL, dir, ring_ref_name,
"%u", &ring_ref[i]);
if (err != 1) {
err = -EINVAL;
xenbus_dev_fatal(dev, err, "reading %s/%s",
dev->otherend, ring_ref_name);
dir, ring_ref_name);
return err;
}
pr_info("ring-ref%u: %u\n", i, ring_ref[i]);
}
}
be->blkif->blk_protocol = BLKIF_PROTOCOL_DEFAULT;
err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",
"%63s", protocol, NULL);
if (err)
strcpy(protocol, "unspecified, assuming default");
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE))
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_32))
be->blkif->blk_protocol = BLKIF_PROTOCOL_X86_32;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_64))
be->blkif->blk_protocol = BLKIF_PROTOCOL_X86_64;
else {
xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);
return -1;
}
err = xenbus_gather(XBT_NIL, dev->otherend,
"feature-persistent", "%u",
&pers_grants, NULL);
if (err)
pers_grants = 0;
be->blkif->vbd.feature_gnt_persistent = pers_grants;
be->blkif->vbd.overflow_max_grants = 0;
be->blkif->nr_ring_pages = nr_grefs;
pr_info("ring-pages:%d, event-channel %d, protocol %d (%s) %s\n",
nr_grefs, evtchn, be->blkif->blk_protocol, protocol,
pers_grants ? "persistent grants" : "");
blkif->nr_ring_pages = nr_grefs;
for (i = 0; i < nr_grefs * XEN_BLKIF_REQS_PER_PAGE; i++) {
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
goto fail;
list_add_tail(&req->free_list, &be->blkif->pending_free);
list_add_tail(&req->free_list, &ring->pending_free);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
req->segments[j] = kzalloc(sizeof(*req->segments[0]), GFP_KERNEL);
if (!req->segments[j])
@ -938,7 +979,7 @@ static int connect_ring(struct backend_info *be)
}
/* Map the shared frame, irq etc. */
err = xen_blkif_map(be->blkif, ring_ref, nr_grefs, evtchn);
err = xen_blkif_map(ring, ring_ref, nr_grefs, evtchn);
if (err) {
xenbus_dev_fatal(dev, err, "mapping ring-ref port %u", evtchn);
return err;
@ -947,7 +988,7 @@ static int connect_ring(struct backend_info *be)
return 0;
fail:
list_for_each_entry_safe(req, n, &be->blkif->pending_free, free_list) {
list_for_each_entry_safe(req, n, &ring->pending_free, free_list) {
list_del(&req->free_list);
for (j = 0; j < MAX_INDIRECT_SEGMENTS; j++) {
if (!req->segments[j])
@ -962,6 +1003,93 @@ fail:
kfree(req);
}
return -ENOMEM;
}
static int connect_ring(struct backend_info *be)
{
struct xenbus_device *dev = be->dev;
unsigned int pers_grants;
char protocol[64] = "";
int err, i;
char *xspath;
size_t xspathsize;
const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */
unsigned int requested_num_queues = 0;
pr_debug("%s %s\n", __func__, dev->otherend);
be->blkif->blk_protocol = BLKIF_PROTOCOL_DEFAULT;
err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",
"%63s", protocol, NULL);
if (err)
strcpy(protocol, "unspecified, assuming default");
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE))
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_32))
be->blkif->blk_protocol = BLKIF_PROTOCOL_X86_32;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_64))
be->blkif->blk_protocol = BLKIF_PROTOCOL_X86_64;
else {
xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);
return -ENOSYS;
}
err = xenbus_gather(XBT_NIL, dev->otherend,
"feature-persistent", "%u",
&pers_grants, NULL);
if (err)
pers_grants = 0;
be->blkif->vbd.feature_gnt_persistent = pers_grants;
be->blkif->vbd.overflow_max_grants = 0;
/*
* Read the number of hardware queues from frontend.
*/
err = xenbus_scanf(XBT_NIL, dev->otherend, "multi-queue-num-queues",
"%u", &requested_num_queues);
if (err < 0) {
requested_num_queues = 1;
} else {
if (requested_num_queues > xenblk_max_queues
|| requested_num_queues == 0) {
/* Buggy or malicious guest. */
xenbus_dev_fatal(dev, err,
"guest requested %u queues, exceeding the maximum of %u.",
requested_num_queues, xenblk_max_queues);
return -ENOSYS;
}
}
be->blkif->nr_rings = requested_num_queues;
if (xen_blkif_alloc_rings(be->blkif))
return -ENOMEM;
pr_info("%s: using %d queues, protocol %d (%s) %s\n", dev->nodename,
be->blkif->nr_rings, be->blkif->blk_protocol, protocol,
pers_grants ? "persistent grants" : "");
if (be->blkif->nr_rings == 1)
return read_per_ring_refs(&be->blkif->rings[0], dev->otherend);
else {
xspathsize = strlen(dev->otherend) + xenstore_path_ext_size;
xspath = kmalloc(xspathsize, GFP_KERNEL);
if (!xspath) {
xenbus_dev_fatal(dev, -ENOMEM, "reading ring references");
return -ENOMEM;
}
for (i = 0; i < be->blkif->nr_rings; i++) {
memset(xspath, 0, xspathsize);
snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, i);
err = read_per_ring_refs(&be->blkif->rings[i], xspath);
if (err) {
kfree(xspath);
return err;
}
}
kfree(xspath);
}
return 0;
}
static const struct xenbus_device_id xen_blkbk_ids[] = {

1069
drivers/block/xen-blkfront.c
Просмотреть файл

Разница между файлами не показана из-за своего большого размера Загрузить разницу

5
drivers/md/bcache/btree.c
Просмотреть файл

@ -1741,6 +1741,7 @@ static void bch_btree_gc(struct cache_set *c)
do {
ret = btree_root(gc_root, c, &op, &writes, &stats);
closure_sync(&writes);
cond_resched();
if (ret && ret != -EAGAIN)
pr_warn("gc failed!");
@ -2162,8 +2163,10 @@ int bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
rw_lock(true, b, b->level);
if (b->key.ptr[0] != btree_ptr ||
b->seq != seq + 1)
b->seq != seq + 1) {
op->lock = b->level;
goto out;
}
}
SET_KEY_PTRS(check_key, 1);

16
drivers/md/bcache/super.c
Просмотреть файл

@ -685,6 +685,8 @@ static void bcache_device_link(struct bcache_device *d, struct cache_set *c,
WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") ||
sysfs_create_link(&c->kobj, &d->kobj, d->name),
"Couldn't create device <-> cache set symlinks");
clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags);
}
static void bcache_device_detach(struct bcache_device *d)
@ -847,8 +849,11 @@ void bch_cached_dev_run(struct cached_dev *dc)
buf[SB_LABEL_SIZE] = '\0';
env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf);
if (atomic_xchg(&dc->running, 1))
if (atomic_xchg(&dc->running, 1)) {
kfree(env[1]);
kfree(env[2]);
return;
}
if (!d->c &&
BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) {
@ -1933,6 +1938,8 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
else
err = "device busy";
mutex_unlock(&bch_register_lock);
if (attr == &ksysfs_register_quiet)
goto out;
}
goto err;
}
@ -1971,8 +1978,7 @@ out:
err_close:
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
err:
if (attr != &ksysfs_register_quiet)
pr_info("error opening %s: %s", path, err);
pr_info("error opening %s: %s", path, err);
ret = -EINVAL;
goto out;
}
@ -2066,8 +2072,10 @@ static int __init bcache_init(void)
closure_debug_init();
bcache_major = register_blkdev(0, "bcache");
if (bcache_major < 0)
if (bcache_major < 0) {
unregister_reboot_notifier(&reboot);
return bcache_major;
}
if (!(bcache_wq = create_workqueue("bcache")) ||
!(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) ||

37
drivers/md/bcache/writeback.c
Просмотреть файл

@ -323,6 +323,10 @@ void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
static bool dirty_pred(struct keybuf *buf, struct bkey *k)
{
struct cached_dev *dc = container_of(buf, struct cached_dev, writeback_keys);
BUG_ON(KEY_INODE(k) != dc->disk.id);
return KEY_DIRTY(k);
}
@ -372,11 +376,24 @@ next:
}
}
/*
* Returns true if we scanned the entire disk
*/
static bool refill_dirty(struct cached_dev *dc)
{
struct keybuf *buf = &dc->writeback_keys;
struct bkey start = KEY(dc->disk.id, 0, 0);
struct bkey end = KEY(dc->disk.id, MAX_KEY_OFFSET, 0);
bool searched_from_start = false;
struct bkey start_pos;
/*
* make sure keybuf pos is inside the range for this disk - at bringup
* we might not be attached yet so this disk's inode nr isn't
* initialized then
*/
if (bkey_cmp(&buf->last_scanned, &start) < 0 ||
bkey_cmp(&buf->last_scanned, &end) > 0)
buf->last_scanned = start;
if (dc->partial_stripes_expensive) {
refill_full_stripes(dc);
@ -384,14 +401,20 @@ static bool refill_dirty(struct cached_dev *dc)
return false;
}
if (bkey_cmp(&buf->last_scanned, &end) >= 0) {
buf->last_scanned = KEY(dc->disk.id, 0, 0);
searched_from_start = true;
}
start_pos = buf->last_scanned;
bch_refill_keybuf(dc->disk.c, buf, &end, dirty_pred);
return bkey_cmp(&buf->last_scanned, &end) >= 0 && searched_from_start;
if (bkey_cmp(&buf->last_scanned, &end) < 0)
return false;
/*
* If we get to the end start scanning again from the beginning, and
* only scan up to where we initially started scanning from:
*/
buf->last_scanned = start;
bch_refill_keybuf(dc->disk.c, buf, &start_pos, dirty_pred);
return bkey_cmp(&buf->last_scanned, &start_pos) >= 0;
}
static int bch_writeback_thread(void *arg)

3
drivers/md/bcache/writeback.h
Просмотреть файл

@ -63,7 +63,8 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
static inline void bch_writeback_queue(struct cached_dev *dc)
{
wake_up_process(dc->writeback_thread);
if (!IS_ERR_OR_NULL(dc->writeback_thread))
wake_up_process(dc->writeback_thread);
}
static inline void bch_writeback_add(struct cached_dev *dc)

26
include/linux/drbd.h
Просмотреть файл

@ -25,7 +25,6 @@
*/
#ifndef DRBD_H
#define DRBD_H
#include <linux/connector.h>
#include <asm/types.h>
#ifdef __KERNEL__
@ -52,7 +51,7 @@
#endif
extern const char *drbd_buildtag(void);
#define REL_VERSION "8.4.5"
#define REL_VERSION "8.4.6"
#define API_VERSION 1
#define PRO_VERSION_MIN 86
#define PRO_VERSION_MAX 101
@ -339,6 +338,8 @@ enum drbd_state_rv {
#define MDF_AL_CLEAN (1 << 7)
#define MDF_AL_DISABLED (1 << 8)
#define MAX_PEERS 32
enum drbd_uuid_index {
UI_CURRENT,
UI_BITMAP,
@ -349,14 +350,35 @@ enum drbd_uuid_index {
UI_EXTENDED_SIZE /* Everything. */
};
#define HISTORY_UUIDS MAX_PEERS
enum drbd_timeout_flag {
UT_DEFAULT = 0,
UT_DEGRADED = 1,
UT_PEER_OUTDATED = 2,
};
enum drbd_notification_type {
NOTIFY_EXISTS,
NOTIFY_CREATE,
NOTIFY_CHANGE,
NOTIFY_DESTROY,
NOTIFY_CALL,
NOTIFY_RESPONSE,
NOTIFY_CONTINUES = 0x8000,
NOTIFY_FLAGS = NOTIFY_CONTINUES,
};
#define UUID_JUST_CREATED ((__u64)4)
enum write_ordering_e {
WO_NONE,
WO_DRAIN_IO,
WO_BDEV_FLUSH,
WO_BIO_BARRIER
};
/* magic numbers used in meta data and network packets */
#define DRBD_MAGIC 0x83740267
#define DRBD_MAGIC_BIG 0x835a

149
include/linux/drbd_genl.h
Просмотреть файл

@ -250,6 +250,76 @@ GENL_struct(DRBD_NLA_DETACH_PARMS, 13, detach_parms,
__flg_field(1, DRBD_GENLA_F_MANDATORY, force_detach)
)
GENL_struct(DRBD_NLA_RESOURCE_INFO, 15, resource_info,
__u32_field(1, 0, res_role)
__flg_field(2, 0, res_susp)
__flg_field(3, 0, res_susp_nod)
__flg_field(4, 0, res_susp_fen)
/* __flg_field(5, 0, res_weak) */
)
GENL_struct(DRBD_NLA_DEVICE_INFO, 16, device_info,
__u32_field(1, 0, dev_disk_state)
)
GENL_struct(DRBD_NLA_CONNECTION_INFO, 17, connection_info,
__u32_field(1, 0, conn_connection_state)
__u32_field(2, 0, conn_role)
)
GENL_struct(DRBD_NLA_PEER_DEVICE_INFO, 18, peer_device_info,
__u32_field(1, 0, peer_repl_state)
__u32_field(2, 0, peer_disk_state)
__u32_field(3, 0, peer_resync_susp_user)
__u32_field(4, 0, peer_resync_susp_peer)
__u32_field(5, 0, peer_resync_susp_dependency)
)
GENL_struct(DRBD_NLA_RESOURCE_STATISTICS, 19, resource_statistics,
__u32_field(1, 0, res_stat_write_ordering)
)
GENL_struct(DRBD_NLA_DEVICE_STATISTICS, 20, device_statistics,
__u64_field(1, 0, dev_size) /* (sectors) */
__u64_field(2, 0, dev_read) /* (sectors) */
__u64_field(3, 0, dev_write) /* (sectors) */
__u64_field(4, 0, dev_al_writes) /* activity log writes (count) */
__u64_field(5, 0, dev_bm_writes) /* bitmap writes (count) */
__u32_field(6, 0, dev_upper_pending) /* application requests in progress */
__u32_field(7, 0, dev_lower_pending) /* backing device requests in progress */
__flg_field(8, 0, dev_upper_blocked)
__flg_field(9, 0, dev_lower_blocked)
__flg_field(10, 0, dev_al_suspended) /* activity log suspended */
__u64_field(11, 0, dev_exposed_data_uuid)
__u64_field(12, 0, dev_current_uuid)
__u32_field(13, 0, dev_disk_flags)
__bin_field(14, 0, history_uuids, HISTORY_UUIDS * sizeof(__u64))
)
GENL_struct(DRBD_NLA_CONNECTION_STATISTICS, 21, connection_statistics,
__flg_field(1, 0, conn_congested)
)
GENL_struct(DRBD_NLA_PEER_DEVICE_STATISTICS, 22, peer_device_statistics,
__u64_field(1, 0, peer_dev_received) /* sectors */
__u64_field(2, 0, peer_dev_sent) /* sectors */
__u32_field(3, 0, peer_dev_pending) /* number of requests */
__u32_field(4, 0, peer_dev_unacked) /* number of requests */
__u64_field(5, 0, peer_dev_out_of_sync) /* sectors */
__u64_field(6, 0, peer_dev_resync_failed) /* sectors */
__u64_field(7, 0, peer_dev_bitmap_uuid)
__u32_field(9, 0, peer_dev_flags)
)
GENL_struct(DRBD_NLA_NOTIFICATION_HEADER, 23, drbd_notification_header,
__u32_field(1, DRBD_GENLA_F_MANDATORY, nh_type)
)
GENL_struct(DRBD_NLA_HELPER, 24, drbd_helper_info,
__str_field(1, DRBD_GENLA_F_MANDATORY, helper_name, 32)
__u32_field(2, DRBD_GENLA_F_MANDATORY, helper_status)
)
/*
* Notifications and commands (genlmsghdr->cmd)
*/
@ -382,3 +452,82 @@ GENL_op(DRBD_ADM_GET_TIMEOUT_TYPE, 26, GENL_doit(drbd_adm_get_timeout_type),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
GENL_op(DRBD_ADM_DOWN, 27, GENL_doit(drbd_adm_down),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
GENL_op(DRBD_ADM_GET_RESOURCES, 30,
GENL_op_init(
.dumpit = drbd_adm_dump_resources,
),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_RESOURCE_INFO, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_RESOURCE_STATISTICS, DRBD_GENLA_F_MANDATORY))
GENL_op(DRBD_ADM_GET_DEVICES, 31,
GENL_op_init(
.dumpit = drbd_adm_dump_devices,
.done = drbd_adm_dump_devices_done,
),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_DEVICE_INFO, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_DEVICE_STATISTICS, DRBD_GENLA_F_MANDATORY))
GENL_op(DRBD_ADM_GET_CONNECTIONS, 32,
GENL_op_init(
.dumpit = drbd_adm_dump_connections,
.done = drbd_adm_dump_connections_done,
),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_CONNECTION_INFO, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_CONNECTION_STATISTICS, DRBD_GENLA_F_MANDATORY))
GENL_op(DRBD_ADM_GET_PEER_DEVICES, 33,
GENL_op_init(
.dumpit = drbd_adm_dump_peer_devices,
.done = drbd_adm_dump_peer_devices_done,
),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_PEER_DEVICE_INFO, DRBD_GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_PEER_DEVICE_STATISTICS, DRBD_GENLA_F_MANDATORY))
GENL_notification(
DRBD_RESOURCE_STATE, 34, events,
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NOTIFICATION_HEADER, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_RESOURCE_INFO, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_RESOURCE_STATISTICS, DRBD_F_REQUIRED))
GENL_notification(
DRBD_DEVICE_STATE, 35, events,
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NOTIFICATION_HEADER, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_DEVICE_INFO, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_DEVICE_STATISTICS, DRBD_F_REQUIRED))
GENL_notification(
DRBD_CONNECTION_STATE, 36, events,
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NOTIFICATION_HEADER, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_CONNECTION_INFO, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_CONNECTION_STATISTICS, DRBD_F_REQUIRED))
GENL_notification(
DRBD_PEER_DEVICE_STATE, 37, events,
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NOTIFICATION_HEADER, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_PEER_DEVICE_INFO, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_PEER_DEVICE_STATISTICS, DRBD_F_REQUIRED))
GENL_op(
DRBD_ADM_GET_INITIAL_STATE, 38,
GENL_op_init(
.dumpit = drbd_adm_get_initial_state,
),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY))
GENL_notification(
DRBD_HELPER, 40, events,
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_HELPER, DRBD_F_REQUIRED))
GENL_notification(
DRBD_INITIAL_STATE_DONE, 41, events,
GENL_tla_expected(DRBD_NLA_NOTIFICATION_HEADER, DRBD_F_REQUIRED))

14
include/linux/idr.h
Просмотреть файл

@ -135,6 +135,20 @@ static inline void *idr_find(struct idr *idr, int id)
#define idr_for_each_entry(idp, entry, id) \
for (id = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++id)
/**
* idr_for_each_entry - continue iteration over an idr's elements of a given type
* @idp: idr handle
* @entry: the type * to use as cursor
* @id: id entry's key
*
* Continue to iterate over list of given type, continuing after
* the current position.
*/
#define idr_for_each_entry_continue(idp, entry, id) \
for ((entry) = idr_get_next((idp), &(id)); \
entry; \
++id, (entry) = idr_get_next((idp), &(id)))
/*
* IDA - IDR based id allocator, use when translation from id to
* pointer isn't necessary.

2
include/linux/lru_cache.h
Просмотреть файл

@ -264,7 +264,7 @@ extern unsigned int lc_put(struct lru_cache *lc, struct lc_element *e);
extern void lc_committed(struct lru_cache *lc);
struct seq_file;
extern size_t lc_seq_printf_stats(struct seq_file *seq, struct lru_cache *lc);
extern void lc_seq_printf_stats(struct seq_file *seq, struct lru_cache *lc);
extern void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char *utext,
void (*detail) (struct seq_file *, struct lc_element *));

48
include/xen/interface/io/blkif.h
Просмотреть файл

@ -27,6 +27,54 @@
typedef uint16_t blkif_vdev_t;
typedef uint64_t blkif_sector_t;
/*
* Multiple hardware queues/rings:
* If supported, the backend will write the key "multi-queue-max-queues" to
* the directory for that vbd, and set its value to the maximum supported
* number of queues.
* Frontends that are aware of this feature and wish to use it can write the
* key "multi-queue-num-queues" with the number they wish to use, which must be
* greater than zero, and no more than the value reported by the backend in
* "multi-queue-max-queues".
*
* For frontends requesting just one queue, the usual event-channel and
* ring-ref keys are written as before, simplifying the backend processing
* to avoid distinguishing between a frontend that doesn't understand the
* multi-queue feature, and one that does, but requested only one queue.
*
* Frontends requesting two or more queues must not write the toplevel
* event-channel and ring-ref keys, instead writing those keys under sub-keys
* having the name "queue-N" where N is the integer ID of the queue/ring for
* which those keys belong. Queues are indexed from zero.
* For example, a frontend with two queues must write the following set of
* queue-related keys:
*
* /local/domain/1/device/vbd/0/multi-queue-num-queues = "2"
* /local/domain/1/device/vbd/0/queue-0 = ""
* /local/domain/1/device/vbd/0/queue-0/ring-ref = "<ring-ref#0>"
* /local/domain/1/device/vbd/0/queue-0/event-channel = "<evtchn#0>"
* /local/domain/1/device/vbd/0/queue-1 = ""
* /local/domain/1/device/vbd/0/queue-1/ring-ref = "<ring-ref#1>"
* /local/domain/1/device/vbd/0/queue-1/event-channel = "<evtchn#1>"
*
* It is also possible to use multiple queues/rings together with
* feature multi-page ring buffer.
* For example, a frontend requests two queues/rings and the size of each ring
* buffer is two pages must write the following set of related keys:
*
* /local/domain/1/device/vbd/0/multi-queue-num-queues = "2"
* /local/domain/1/device/vbd/0/ring-page-order = "1"
* /local/domain/1/device/vbd/0/queue-0 = ""
* /local/domain/1/device/vbd/0/queue-0/ring-ref0 = "<ring-ref#0>"
* /local/domain/1/device/vbd/0/queue-0/ring-ref1 = "<ring-ref#1>"
* /local/domain/1/device/vbd/0/queue-0/event-channel = "<evtchn#0>"
* /local/domain/1/device/vbd/0/queue-1 = ""
* /local/domain/1/device/vbd/0/queue-1/ring-ref0 = "<ring-ref#2>"
* /local/domain/1/device/vbd/0/queue-1/ring-ref1 = "<ring-ref#3>"
* /local/domain/1/device/vbd/0/queue-1/event-channel = "<evtchn#1>"
*
*/
/*
* REQUEST CODES.
*/

4
lib/lru_cache.c
Просмотреть файл

@ -238,7 +238,7 @@ void lc_reset(struct lru_cache *lc)
* @seq: the seq_file to print into
* @lc: the lru cache to print statistics of
*/
size_t lc_seq_printf_stats(struct seq_file *seq, struct lru_cache *lc)
void lc_seq_printf_stats(struct seq_file *seq, struct lru_cache *lc)
{
/* NOTE:
* total calls to lc_get are
@ -250,8 +250,6 @@ size_t lc_seq_printf_stats(struct seq_file *seq, struct lru_cache *lc)
seq_printf(seq, "\t%s: used:%u/%u hits:%lu misses:%lu starving:%lu locked:%lu changed:%lu\n",
lc->name, lc->used, lc->nr_elements,
lc->hits, lc->misses, lc->starving, lc->locked, lc->changed);
return 0;
}
static struct hlist_head *lc_hash_slot(struct lru_cache *lc, unsigned int enr)