Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md:
  async_tx: fix asynchronous raid6 recovery for ddf layouts
  async_pq: rename scribble page
  async_pq: kill a stray dma_map() call and other cleanups
  md/raid6: kill a gcc-4.0.1 'uninitialized variable' warning
  raid6/async_tx: handle holes in block list in async_syndrome_val
  md/async: don't pass a memory pointer as a page pointer.
  md: Fix handling of raid5 array which is being reshaped to fewer devices.
  md: fix problems with RAID6 calculations for DDF.
  md/raid456: downlevel multicore operations to raid_run_ops
  md: drivers/md/unroll.pl replaced with awk analog
  md: remove clumsy usage of do_sync_mapping_range from bitmap code
  md: raid1/raid10: handle allocation errors during array setup.
  md/raid5: initialize conf->device_lock earlier
  md/raid1/raid10: add a cond_resched
  Revert "md: do not progress the resync process if the stripe was blocked"
This commit is contained in:
Linus Torvalds 2009-10-31 12:12:19 -07:00
Родитель aefba418bf da17bf4306
Коммит bf699c9bac
15 изменённых файлов: 291 добавлений и 231 удалений

Просмотреть файл

@ -26,14 +26,10 @@
#include <linux/async_tx.h>
/**
* scribble - space to hold throwaway P buffer for synchronous gen_syndrome
* pq_scribble_page - space to hold throwaway P or Q buffer for
* synchronous gen_syndrome
*/
static struct page *scribble;
static bool is_raid6_zero_block(struct page *p)
{
return p == (void *) raid6_empty_zero_page;
}
static struct page *pq_scribble_page;
/* the struct page *blocks[] parameter passed to async_gen_syndrome()
* and async_syndrome_val() contains the 'P' destination address at
@ -83,7 +79,7 @@ do_async_gen_syndrome(struct dma_chan *chan, struct page **blocks,
* sources and update the coefficients accordingly
*/
for (i = 0, idx = 0; i < src_cnt; i++) {
if (is_raid6_zero_block(blocks[i]))
if (blocks[i] == NULL)
continue;
dma_src[idx] = dma_map_page(dma->dev, blocks[i], offset, len,
DMA_TO_DEVICE);
@ -160,9 +156,9 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
srcs = (void **) blocks;
for (i = 0; i < disks; i++) {
if (is_raid6_zero_block(blocks[i])) {
if (blocks[i] == NULL) {
BUG_ON(i > disks - 3); /* P or Q can't be zero */
srcs[i] = blocks[i];
srcs[i] = (void*)raid6_empty_zero_page;
} else
srcs[i] = page_address(blocks[i]) + offset;
}
@ -186,10 +182,14 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
* blocks[disks-1] to NULL. When P or Q is omitted 'len' must be <=
* PAGE_SIZE as a temporary buffer of this size is used in the
* synchronous path. 'disks' always accounts for both destination
* buffers.
* buffers. If any source buffers (blocks[i] where i < disks - 2) are
* set to NULL those buffers will be replaced with the raid6_zero_page
* in the synchronous path and omitted in the hardware-asynchronous
* path.
*
* 'blocks' note: if submit->scribble is NULL then the contents of
* 'blocks' may be overridden
* 'blocks' may be overwritten to perform address conversions
* (dma_map_page() or page_address()).
*/
struct dma_async_tx_descriptor *
async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
@ -227,11 +227,11 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
async_tx_quiesce(&submit->depend_tx);
if (!P(blocks, disks)) {
P(blocks, disks) = scribble;
P(blocks, disks) = pq_scribble_page;
BUG_ON(len + offset > PAGE_SIZE);
}
if (!Q(blocks, disks)) {
Q(blocks, disks) = scribble;
Q(blocks, disks) = pq_scribble_page;
BUG_ON(len + offset > PAGE_SIZE);
}
do_sync_gen_syndrome(blocks, offset, disks, len, submit);
@ -265,8 +265,10 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
len);
struct dma_device *device = chan ? chan->device : NULL;
struct dma_async_tx_descriptor *tx;
unsigned char coefs[disks-2];
enum dma_ctrl_flags dma_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0;
dma_addr_t *dma_src = NULL;
int src_cnt = 0;
BUG_ON(disks < 4);
@ -285,22 +287,32 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
__func__, disks, len);
if (!P(blocks, disks))
dma_flags |= DMA_PREP_PQ_DISABLE_P;
else
pq[0] = dma_map_page(dev, P(blocks, disks),
offset, len,
DMA_TO_DEVICE);
if (!Q(blocks, disks))
dma_flags |= DMA_PREP_PQ_DISABLE_Q;
else
pq[1] = dma_map_page(dev, Q(blocks, disks),
offset, len,
DMA_TO_DEVICE);
if (submit->flags & ASYNC_TX_FENCE)
dma_flags |= DMA_PREP_FENCE;
for (i = 0; i < disks; i++)
for (i = 0; i < disks-2; i++)
if (likely(blocks[i])) {
BUG_ON(is_raid6_zero_block(blocks[i]));
dma_src[i] = dma_map_page(dev, blocks[i],
offset, len,
DMA_TO_DEVICE);
dma_src[src_cnt] = dma_map_page(dev, blocks[i],
offset, len,
DMA_TO_DEVICE);
coefs[src_cnt] = raid6_gfexp[i];
src_cnt++;
}
for (;;) {
tx = device->device_prep_dma_pq_val(chan, pq, dma_src,
disks - 2,
raid6_gfexp,
src_cnt,
coefs,
len, pqres,
dma_flags);
if (likely(tx))
@ -373,9 +385,9 @@ EXPORT_SYMBOL_GPL(async_syndrome_val);
static int __init async_pq_init(void)
{
scribble = alloc_page(GFP_KERNEL);
pq_scribble_page = alloc_page(GFP_KERNEL);
if (scribble)
if (pq_scribble_page)
return 0;
pr_err("%s: failed to allocate required spare page\n", __func__);
@ -385,7 +397,7 @@ static int __init async_pq_init(void)
static void __exit async_pq_exit(void)
{
put_page(scribble);
put_page(pq_scribble_page);
}
module_init(async_pq_init);

Просмотреть файл

@ -131,8 +131,8 @@ async_mult(struct page *dest, struct page *src, u8 coef, size_t len,
}
static struct dma_async_tx_descriptor *
__2data_recov_4(size_t bytes, int faila, int failb, struct page **blocks,
struct async_submit_ctl *submit)
__2data_recov_4(int disks, size_t bytes, int faila, int failb,
struct page **blocks, struct async_submit_ctl *submit)
{
struct dma_async_tx_descriptor *tx = NULL;
struct page *p, *q, *a, *b;
@ -143,8 +143,8 @@ __2data_recov_4(size_t bytes, int faila, int failb, struct page **blocks,
void *cb_param = submit->cb_param;
void *scribble = submit->scribble;
p = blocks[4-2];
q = blocks[4-1];
p = blocks[disks-2];
q = blocks[disks-1];
a = blocks[faila];
b = blocks[failb];
@ -170,8 +170,8 @@ __2data_recov_4(size_t bytes, int faila, int failb, struct page **blocks,
}
static struct dma_async_tx_descriptor *
__2data_recov_5(size_t bytes, int faila, int failb, struct page **blocks,
struct async_submit_ctl *submit)
__2data_recov_5(int disks, size_t bytes, int faila, int failb,
struct page **blocks, struct async_submit_ctl *submit)
{
struct dma_async_tx_descriptor *tx = NULL;
struct page *p, *q, *g, *dp, *dq;
@ -181,21 +181,22 @@ __2data_recov_5(size_t bytes, int faila, int failb, struct page **blocks,
dma_async_tx_callback cb_fn = submit->cb_fn;
void *cb_param = submit->cb_param;
void *scribble = submit->scribble;
int uninitialized_var(good);
int i;
int good_srcs, good, i;
for (i = 0; i < 3; i++) {
good_srcs = 0;
good = -1;
for (i = 0; i < disks-2; i++) {
if (blocks[i] == NULL)
continue;
if (i == faila || i == failb)
continue;
else {
good = i;
break;
}
good = i;
good_srcs++;
}
BUG_ON(i >= 3);
BUG_ON(good_srcs > 1);
p = blocks[5-2];
q = blocks[5-1];
p = blocks[disks-2];
q = blocks[disks-1];
g = blocks[good];
/* Compute syndrome with zero for the missing data pages
@ -263,10 +264,10 @@ __2data_recov_n(int disks, size_t bytes, int faila, int failb,
* delta p and delta q
*/
dp = blocks[faila];
blocks[faila] = (void *)raid6_empty_zero_page;
blocks[faila] = NULL;
blocks[disks-2] = dp;
dq = blocks[failb];
blocks[failb] = (void *)raid6_empty_zero_page;
blocks[failb] = NULL;
blocks[disks-1] = dq;
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
@ -323,6 +324,8 @@ struct dma_async_tx_descriptor *
async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
struct page **blocks, struct async_submit_ctl *submit)
{
int non_zero_srcs, i;
BUG_ON(faila == failb);
if (failb < faila)
swap(faila, failb);
@ -334,11 +337,13 @@ async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
*/
if (!submit->scribble) {
void **ptrs = (void **) blocks;
int i;
async_tx_quiesce(&submit->depend_tx);
for (i = 0; i < disks; i++)
ptrs[i] = page_address(blocks[i]);
if (blocks[i] == NULL)
ptrs[i] = (void *) raid6_empty_zero_page;
else
ptrs[i] = page_address(blocks[i]);
raid6_2data_recov(disks, bytes, faila, failb, ptrs);
@ -347,19 +352,30 @@ async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
return NULL;
}
switch (disks) {
case 4:
non_zero_srcs = 0;
for (i = 0; i < disks-2 && non_zero_srcs < 4; i++)
if (blocks[i])
non_zero_srcs++;
switch (non_zero_srcs) {
case 0:
case 1:
/* There must be at least 2 sources - the failed devices. */
BUG();
case 2:
/* dma devices do not uniformly understand a zero source pq
* operation (in contrast to the synchronous case), so
* explicitly handle the 4 disk special case
* explicitly handle the special case of a 4 disk array with
* both data disks missing.
*/
return __2data_recov_4(bytes, faila, failb, blocks, submit);
case 5:
return __2data_recov_4(disks, bytes, faila, failb, blocks, submit);
case 3:
/* dma devices do not uniformly understand a single
* source pq operation (in contrast to the synchronous
* case), so explicitly handle the 5 disk special case
* case), so explicitly handle the special case of a 5 disk
* array with 2 of 3 data disks missing.
*/
return __2data_recov_5(bytes, faila, failb, blocks, submit);
return __2data_recov_5(disks, bytes, faila, failb, blocks, submit);
default:
return __2data_recov_n(disks, bytes, faila, failb, blocks, submit);
}
@ -385,6 +401,7 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
dma_async_tx_callback cb_fn = submit->cb_fn;
void *cb_param = submit->cb_param;
void *scribble = submit->scribble;
int good_srcs, good, i;
struct page *srcs[2];
pr_debug("%s: disks: %d len: %zu\n", __func__, disks, bytes);
@ -394,11 +411,13 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
*/
if (!scribble) {
void **ptrs = (void **) blocks;
int i;
async_tx_quiesce(&submit->depend_tx);
for (i = 0; i < disks; i++)
ptrs[i] = page_address(blocks[i]);
if (blocks[i] == NULL)
ptrs[i] = (void*)raid6_empty_zero_page;
else
ptrs[i] = page_address(blocks[i]);
raid6_datap_recov(disks, bytes, faila, ptrs);
@ -407,6 +426,20 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
return NULL;
}
good_srcs = 0;
good = -1;
for (i = 0; i < disks-2; i++) {
if (i == faila)
continue;
if (blocks[i]) {
good = i;
good_srcs++;
if (good_srcs > 1)
break;
}
}
BUG_ON(good_srcs == 0);
p = blocks[disks-2];
q = blocks[disks-1];
@ -414,14 +447,13 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
* Use the dead data page as temporary storage for delta q
*/
dq = blocks[faila];
blocks[faila] = (void *)raid6_empty_zero_page;
blocks[faila] = NULL;
blocks[disks-1] = dq;
/* in the 4 disk case we only need to perform a single source
* multiplication
/* in the 4-disk case we only need to perform a single source
* multiplication with the one good data block.
*/
if (disks == 4) {
int good = faila == 0 ? 1 : 0;
if (good_srcs == 1) {
struct page *g = blocks[good];
init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL,

Просмотреть файл

@ -44,20 +44,23 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list,
void *cb_param_orig = submit->cb_param;
enum async_tx_flags flags_orig = submit->flags;
enum dma_ctrl_flags dma_flags;
int xor_src_cnt;
int xor_src_cnt = 0;
dma_addr_t dma_dest;
/* map the dest bidrectional in case it is re-used as a source */
dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_BIDIRECTIONAL);
for (i = 0; i < src_cnt; i++) {
/* only map the dest once */
if (!src_list[i])
continue;
if (unlikely(src_list[i] == dest)) {
dma_src[i] = dma_dest;
dma_src[xor_src_cnt++] = dma_dest;
continue;
}
dma_src[i] = dma_map_page(dma->dev, src_list[i], offset,
len, DMA_TO_DEVICE);
dma_src[xor_src_cnt++] = dma_map_page(dma->dev, src_list[i], offset,
len, DMA_TO_DEVICE);
}
src_cnt = xor_src_cnt;
while (src_cnt) {
submit->flags = flags_orig;
@ -123,7 +126,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset,
int src_cnt, size_t len, struct async_submit_ctl *submit)
{
int i;
int xor_src_cnt;
int xor_src_cnt = 0;
int src_off = 0;
void *dest_buf;
void **srcs;
@ -135,8 +138,9 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset,
/* convert to buffer pointers */
for (i = 0; i < src_cnt; i++)
srcs[i] = page_address(src_list[i]) + offset;
if (src_list[i])
srcs[xor_src_cnt++] = page_address(src_list[i]) + offset;
src_cnt = xor_src_cnt;
/* set destination address */
dest_buf = page_address(dest) + offset;

Просмотреть файл

@ -46,7 +46,7 @@ obj-$(CONFIG_DM_LOG_USERSPACE) += dm-log-userspace.o
obj-$(CONFIG_DM_ZERO) += dm-zero.o
quiet_cmd_unroll = UNROLL $@
cmd_unroll = $(PERL) $(srctree)/$(src)/unroll.pl $(UNROLL) \
cmd_unroll = $(AWK) -f$(srctree)/$(src)/unroll.awk -vN=$(UNROLL) \
< $< > $@ || ( rm -f $@ && exit 1 )
ifeq ($(CONFIG_ALTIVEC),y)
@ -59,56 +59,56 @@ endif
targets += raid6int1.c
$(obj)/raid6int1.c: UNROLL := 1
$(obj)/raid6int1.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
$(obj)/raid6int1.c: $(src)/raid6int.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
targets += raid6int2.c
$(obj)/raid6int2.c: UNROLL := 2
$(obj)/raid6int2.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
$(obj)/raid6int2.c: $(src)/raid6int.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
targets += raid6int4.c
$(obj)/raid6int4.c: UNROLL := 4
$(obj)/raid6int4.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
$(obj)/raid6int4.c: $(src)/raid6int.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
targets += raid6int8.c
$(obj)/raid6int8.c: UNROLL := 8
$(obj)/raid6int8.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
$(obj)/raid6int8.c: $(src)/raid6int.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
targets += raid6int16.c
$(obj)/raid6int16.c: UNROLL := 16
$(obj)/raid6int16.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
$(obj)/raid6int16.c: $(src)/raid6int.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
targets += raid6int32.c
$(obj)/raid6int32.c: UNROLL := 32
$(obj)/raid6int32.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
$(obj)/raid6int32.c: $(src)/raid6int.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
CFLAGS_raid6altivec1.o += $(altivec_flags)
targets += raid6altivec1.c
$(obj)/raid6altivec1.c: UNROLL := 1
$(obj)/raid6altivec1.c: $(src)/raid6altivec.uc $(src)/unroll.pl FORCE
$(obj)/raid6altivec1.c: $(src)/raid6altivec.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
CFLAGS_raid6altivec2.o += $(altivec_flags)
targets += raid6altivec2.c
$(obj)/raid6altivec2.c: UNROLL := 2
$(obj)/raid6altivec2.c: $(src)/raid6altivec.uc $(src)/unroll.pl FORCE
$(obj)/raid6altivec2.c: $(src)/raid6altivec.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
CFLAGS_raid6altivec4.o += $(altivec_flags)
targets += raid6altivec4.c
$(obj)/raid6altivec4.c: UNROLL := 4
$(obj)/raid6altivec4.c: $(src)/raid6altivec.uc $(src)/unroll.pl FORCE
$(obj)/raid6altivec4.c: $(src)/raid6altivec.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
CFLAGS_raid6altivec8.o += $(altivec_flags)
targets += raid6altivec8.c
$(obj)/raid6altivec8.c: UNROLL := 8
$(obj)/raid6altivec8.c: $(src)/raid6altivec.uc $(src)/unroll.pl FORCE
$(obj)/raid6altivec8.c: $(src)/raid6altivec.uc $(src)/unroll.awk FORCE
$(call if_changed,unroll)
quiet_cmd_mktable = TABLE $@

Просмотреть файл

@ -1624,10 +1624,11 @@ int bitmap_create(mddev_t *mddev)
bitmap->offset = mddev->bitmap_offset;
if (file) {
get_file(file);
do_sync_mapping_range(file->f_mapping, 0, LLONG_MAX,
SYNC_FILE_RANGE_WAIT_BEFORE |
SYNC_FILE_RANGE_WRITE |
SYNC_FILE_RANGE_WAIT_AFTER);
/* As future accesses to this file will use bmap,
* and bypass the page cache, we must sync the file
* first.
*/
vfs_fsync(file, file->f_dentry, 1);
}
/* read superblock from bitmap file (this sets bitmap->chunksize) */
err = bitmap_read_sb(bitmap);

Просмотреть файл

@ -2631,7 +2631,7 @@ static void analyze_sbs(mddev_t * mddev)
rdev->desc_nr = i++;
rdev->raid_disk = rdev->desc_nr;
set_bit(In_sync, &rdev->flags);
} else if (rdev->raid_disk >= mddev->raid_disks) {
} else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
rdev->raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
}

Просмотреть файл

@ -64,7 +64,7 @@ static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data)
/* allocate a r1bio with room for raid_disks entries in the bios array */
r1_bio = kzalloc(size, gfp_flags);
if (!r1_bio)
if (!r1_bio && pi->mddev)
unplug_slaves(pi->mddev);
return r1_bio;
@ -1683,6 +1683,7 @@ static void raid1d(mddev_t *mddev)
generic_make_request(bio);
}
}
cond_resched();
}
if (unplug)
unplug_slaves(mddev);
@ -1978,13 +1979,14 @@ static int run(mddev_t *mddev)
conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
if (!conf->poolinfo)
goto out_no_mem;
conf->poolinfo->mddev = mddev;
conf->poolinfo->mddev = NULL;
conf->poolinfo->raid_disks = mddev->raid_disks;
conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
r1bio_pool_free,
conf->poolinfo);
if (!conf->r1bio_pool)
goto out_no_mem;
conf->poolinfo->mddev = mddev;
spin_lock_init(&conf->device_lock);
mddev->queue->queue_lock = &conf->device_lock;

Просмотреть файл

@ -68,7 +68,7 @@ static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
/* allocate a r10bio with room for raid_disks entries in the bios array */
r10_bio = kzalloc(size, gfp_flags);
if (!r10_bio)
if (!r10_bio && conf->mddev)
unplug_slaves(conf->mddev);
return r10_bio;
@ -1632,6 +1632,7 @@ static void raid10d(mddev_t *mddev)
generic_make_request(bio);
}
}
cond_resched();
}
if (unplug)
unplug_slaves(mddev);
@ -2095,7 +2096,6 @@ static int run(mddev_t *mddev)
if (!conf->tmppage)
goto out_free_conf;
conf->mddev = mddev;
conf->raid_disks = mddev->raid_disks;
conf->near_copies = nc;
conf->far_copies = fc;
@ -2132,6 +2132,7 @@ static int run(mddev_t *mddev)
goto out_free_conf;
}
conf->mddev = mddev;
spin_lock_init(&conf->device_lock);
mddev->queue->queue_lock = &conf->device_lock;

Просмотреть файл

@ -156,13 +156,16 @@ static inline int raid6_next_disk(int disk, int raid_disks)
static int raid6_idx_to_slot(int idx, struct stripe_head *sh,
int *count, int syndrome_disks)
{
int slot;
int slot = *count;
if (sh->ddf_layout)
(*count)++;
if (idx == sh->pd_idx)
return syndrome_disks;
if (idx == sh->qd_idx)
return syndrome_disks + 1;
slot = (*count)++;
if (!sh->ddf_layout)
(*count)++;
return slot;
}
@ -717,7 +720,7 @@ static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh)
int i;
for (i = 0; i < disks; i++)
srcs[i] = (void *)raid6_empty_zero_page;
srcs[i] = NULL;
count = 0;
i = d0_idx;
@ -727,9 +730,8 @@ static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh)
srcs[slot] = sh->dev[i].page;
i = raid6_next_disk(i, disks);
} while (i != d0_idx);
BUG_ON(count != syndrome_disks);
return count;
return syndrome_disks;
}
static struct dma_async_tx_descriptor *
@ -814,7 +816,7 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
* slot number conversion for 'faila' and 'failb'
*/
for (i = 0; i < disks ; i++)
blocks[i] = (void *)raid6_empty_zero_page;
blocks[i] = NULL;
count = 0;
i = d0_idx;
do {
@ -828,7 +830,6 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
failb = slot;
i = raid6_next_disk(i, disks);
} while (i != d0_idx);
BUG_ON(count != syndrome_disks);
BUG_ON(faila == failb);
if (failb < faila)
@ -845,7 +846,7 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu)
init_async_submit(&submit, ASYNC_TX_FENCE, NULL,
ops_complete_compute, sh,
to_addr_conv(sh, percpu));
return async_gen_syndrome(blocks, 0, count+2,
return async_gen_syndrome(blocks, 0, syndrome_disks+2,
STRIPE_SIZE, &submit);
} else {
struct page *dest;
@ -1139,7 +1140,7 @@ static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu
&sh->ops.zero_sum_result, percpu->spare_page, &submit);
}
static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
static void __raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
{
int overlap_clear = 0, i, disks = sh->disks;
struct dma_async_tx_descriptor *tx = NULL;
@ -1204,22 +1205,55 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
put_cpu();
}
#ifdef CONFIG_MULTICORE_RAID456
static void async_run_ops(void *param, async_cookie_t cookie)
{
struct stripe_head *sh = param;
unsigned long ops_request = sh->ops.request;
clear_bit_unlock(STRIPE_OPS_REQ_PENDING, &sh->state);
wake_up(&sh->ops.wait_for_ops);
__raid_run_ops(sh, ops_request);
release_stripe(sh);
}
static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
{
/* since handle_stripe can be called outside of raid5d context
* we need to ensure sh->ops.request is de-staged before another
* request arrives
*/
wait_event(sh->ops.wait_for_ops,
!test_and_set_bit_lock(STRIPE_OPS_REQ_PENDING, &sh->state));
sh->ops.request = ops_request;
atomic_inc(&sh->count);
async_schedule(async_run_ops, sh);
}
#else
#define raid_run_ops __raid_run_ops
#endif
static int grow_one_stripe(raid5_conf_t *conf)
{
struct stripe_head *sh;
int disks = max(conf->raid_disks, conf->previous_raid_disks);
sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL);
if (!sh)
return 0;
memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev));
memset(sh, 0, sizeof(*sh) + (disks-1)*sizeof(struct r5dev));
sh->raid_conf = conf;
spin_lock_init(&sh->lock);
#ifdef CONFIG_MULTICORE_RAID456
init_waitqueue_head(&sh->ops.wait_for_ops);
#endif
if (grow_buffers(sh, conf->raid_disks)) {
shrink_buffers(sh, conf->raid_disks);
if (grow_buffers(sh, disks)) {
shrink_buffers(sh, disks);
kmem_cache_free(conf->slab_cache, sh);
return 0;
}
sh->disks = conf->raid_disks;
/* we just created an active stripe so... */
atomic_set(&sh->count, 1);
atomic_inc(&conf->active_stripes);
@ -1231,7 +1265,7 @@ static int grow_one_stripe(raid5_conf_t *conf)
static int grow_stripes(raid5_conf_t *conf, int num)
{
struct kmem_cache *sc;
int devs = conf->raid_disks;
int devs = max(conf->raid_disks, conf->previous_raid_disks);
sprintf(conf->cache_name[0],
"raid%d-%s", conf->level, mdname(conf->mddev));
@ -1329,6 +1363,9 @@ static int resize_stripes(raid5_conf_t *conf, int newsize)
nsh->raid_conf = conf;
spin_lock_init(&nsh->lock);
#ifdef CONFIG_MULTICORE_RAID456
init_waitqueue_head(&nsh->ops.wait_for_ops);
#endif
list_add(&nsh->lru, &newstripes);
}
@ -1899,10 +1936,15 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
case ALGORITHM_PARITY_N:
break;
case ALGORITHM_ROTATING_N_CONTINUE:
/* Like left_symmetric, but P is before Q */
if (sh->pd_idx == 0)
i--; /* P D D D Q */
else if (i > sh->pd_idx)
i -= 2; /* D D Q P D */
else {
/* D D Q P D */
if (i < sh->pd_idx)
i += raid_disks;
i -= (sh->pd_idx + 1);
}
break;
case ALGORITHM_LEFT_ASYMMETRIC_6:
case ALGORITHM_RIGHT_ASYMMETRIC_6:
@ -2896,7 +2938,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
*
*/
static bool handle_stripe5(struct stripe_head *sh)
static void handle_stripe5(struct stripe_head *sh)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks, i;
@ -3167,11 +3209,9 @@ static bool handle_stripe5(struct stripe_head *sh)
ops_run_io(sh, &s);
return_io(return_bi);
return blocked_rdev == NULL;
}
static bool handle_stripe6(struct stripe_head *sh)
static void handle_stripe6(struct stripe_head *sh)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks;
@ -3455,17 +3495,14 @@ static bool handle_stripe6(struct stripe_head *sh)
ops_run_io(sh, &s);
return_io(return_bi);
return blocked_rdev == NULL;
}
/* returns true if the stripe was handled */
static bool handle_stripe(struct stripe_head *sh)
static void handle_stripe(struct stripe_head *sh)
{
if (sh->raid_conf->level == 6)
return handle_stripe6(sh);
handle_stripe6(sh);
else
return handle_stripe5(sh);
handle_stripe5(sh);
}
static void raid5_activate_delayed(raid5_conf_t *conf)
@ -3503,9 +3540,10 @@ static void unplug_slaves(mddev_t *mddev)
{
raid5_conf_t *conf = mddev->private;
int i;
int devs = max(conf->raid_disks, conf->previous_raid_disks);
rcu_read_lock();
for (i = 0; i < conf->raid_disks; i++) {
for (i = 0; i < devs; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
@ -4277,9 +4315,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
clear_bit(STRIPE_INSYNC, &sh->state);
spin_unlock(&sh->lock);
/* wait for any blocked device to be handled */
while (unlikely(!handle_stripe(sh)))
;
handle_stripe(sh);
release_stripe(sh);
return STRIPE_SECTORS;
@ -4349,37 +4385,6 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
return handled;
}
#ifdef CONFIG_MULTICORE_RAID456
static void __process_stripe(void *param, async_cookie_t cookie)
{
struct stripe_head *sh = param;
handle_stripe(sh);
release_stripe(sh);
}
static void process_stripe(struct stripe_head *sh, struct list_head *domain)
{
async_schedule_domain(__process_stripe, sh, domain);
}
static void synchronize_stripe_processing(struct list_head *domain)
{
async_synchronize_full_domain(domain);
}
#else
static void process_stripe(struct stripe_head *sh, struct list_head *domain)
{
handle_stripe(sh);
release_stripe(sh);
cond_resched();
}
static void synchronize_stripe_processing(struct list_head *domain)
{
}
#endif
/*
* This is our raid5 kernel thread.
@ -4393,7 +4398,6 @@ static void raid5d(mddev_t *mddev)
struct stripe_head *sh;
raid5_conf_t *conf = mddev->private;
int handled;
LIST_HEAD(raid_domain);
pr_debug("+++ raid5d active\n");
@ -4430,7 +4434,9 @@ static void raid5d(mddev_t *mddev)
spin_unlock_irq(&conf->device_lock);
handled++;
process_stripe(sh, &raid_domain);
handle_stripe(sh);
release_stripe(sh);
cond_resched();
spin_lock_irq(&conf->device_lock);
}
@ -4438,7 +4444,6 @@ static void raid5d(mddev_t *mddev)
spin_unlock_irq(&conf->device_lock);
synchronize_stripe_processing(&raid_domain);
async_tx_issue_pending_all();
unplug_slaves(mddev);
@ -4558,13 +4563,9 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
if (!sectors)
sectors = mddev->dev_sectors;
if (!raid_disks) {
if (!raid_disks)
/* size is defined by the smallest of previous and new size */
if (conf->raid_disks < conf->previous_raid_disks)
raid_disks = conf->raid_disks;
else
raid_disks = conf->previous_raid_disks;
}
raid_disks = min(conf->raid_disks, conf->previous_raid_disks);
sectors &= ~((sector_t)mddev->chunk_sectors - 1);
sectors &= ~((sector_t)mddev->new_chunk_sectors - 1);
@ -4665,7 +4666,7 @@ static int raid5_alloc_percpu(raid5_conf_t *conf)
}
per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page;
}
scribble = kmalloc(scribble_len(conf->raid_disks), GFP_KERNEL);
scribble = kmalloc(conf->scribble_len, GFP_KERNEL);
if (!scribble) {
err = -ENOMEM;
break;
@ -4686,7 +4687,7 @@ static int raid5_alloc_percpu(raid5_conf_t *conf)
static raid5_conf_t *setup_conf(mddev_t *mddev)
{
raid5_conf_t *conf;
int raid_disk, memory;
int raid_disk, memory, max_disks;
mdk_rdev_t *rdev;
struct disk_info *disk;
@ -4722,28 +4723,6 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
conf = kzalloc(sizeof(raid5_conf_t), GFP_KERNEL);
if (conf == NULL)
goto abort;
conf->raid_disks = mddev->raid_disks;
conf->scribble_len = scribble_len(conf->raid_disks);
if (mddev->reshape_position == MaxSector)
conf->previous_raid_disks = mddev->raid_disks;
else
conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info),
GFP_KERNEL);
if (!conf->disks)
goto abort;
conf->mddev = mddev;
if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
goto abort;
conf->level = mddev->new_level;
if (raid5_alloc_percpu(conf) != 0)
goto abort;
spin_lock_init(&conf->device_lock);
init_waitqueue_head(&conf->wait_for_stripe);
init_waitqueue_head(&conf->wait_for_overlap);
@ -4757,11 +4736,33 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
atomic_set(&conf->active_aligned_reads, 0);
conf->bypass_threshold = BYPASS_THRESHOLD;
conf->raid_disks = mddev->raid_disks;
if (mddev->reshape_position == MaxSector)
conf->previous_raid_disks = mddev->raid_disks;
else
conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
max_disks = max(conf->raid_disks, conf->previous_raid_disks);
conf->scribble_len = scribble_len(max_disks);
conf->disks = kzalloc(max_disks * sizeof(struct disk_info),
GFP_KERNEL);
if (!conf->disks)
goto abort;
conf->mddev = mddev;
if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
goto abort;
conf->level = mddev->new_level;
if (raid5_alloc_percpu(conf) != 0)
goto abort;
pr_debug("raid5: run(%s) called.\n", mdname(mddev));
list_for_each_entry(rdev, &mddev->disks, same_set) {
raid_disk = rdev->raid_disk;
if (raid_disk >= conf->raid_disks
if (raid_disk >= max_disks
|| raid_disk < 0)
continue;
disk = conf->disks + raid_disk;
@ -4793,7 +4794,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
}
memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
if (grow_stripes(conf, conf->max_nr_stripes)) {
printk(KERN_ERR
"raid5: couldn't allocate %dkB for buffers\n", memory);
@ -4918,7 +4919,8 @@ static int run(mddev_t *mddev)
test_bit(In_sync, &rdev->flags))
working_disks++;
mddev->degraded = conf->raid_disks - working_disks;
mddev->degraded = (max(conf->raid_disks, conf->previous_raid_disks)
- working_disks);
if (mddev->degraded > conf->max_degraded) {
printk(KERN_ERR "raid5: not enough operational devices for %s"

Просмотреть файл

@ -214,12 +214,20 @@ struct stripe_head {
int disks; /* disks in stripe */
enum check_states check_state;
enum reconstruct_states reconstruct_state;
/* stripe_operations
/**
* struct stripe_operations
* @target - STRIPE_OP_COMPUTE_BLK target
* @target2 - 2nd compute target in the raid6 case
* @zero_sum_result - P and Q verification flags
* @request - async service request flags for raid_run_ops
*/
struct stripe_operations {
int target, target2;
enum sum_check_flags zero_sum_result;
#ifdef CONFIG_MULTICORE_RAID456
unsigned long request;
wait_queue_head_t wait_for_ops;
#endif
} ops;
struct r5dev {
struct bio req;
@ -294,6 +302,8 @@ struct r6_state {
#define STRIPE_FULL_WRITE 13 /* all blocks are set to be overwritten */
#define STRIPE_BIOFILL_RUN 14
#define STRIPE_COMPUTE_RUN 15
#define STRIPE_OPS_REQ_PENDING 16
/*
* Operation request flags
*/
@ -478,7 +488,7 @@ static inline int algorithm_valid_raid6(int layout)
{
return (layout >= 0 && layout <= 5)
||
(layout == 8 || layout == 10)
(layout >= 8 && layout <= 10)
||
(layout >= 16 && layout <= 20);
}

Просмотреть файл

@ -15,7 +15,7 @@
*
* $#-way unrolled portable integer math RAID-6 instruction set
*
* This file is postprocessed using unroll.pl
* This file is postprocessed using unroll.awk
*
* <benh> hpa: in process,
* you can just "steal" the vec unit with enable_kernel_altivec() (but

Просмотреть файл

@ -15,7 +15,7 @@
*
* $#-way unrolled portable integer math RAID-6 instruction set
*
* This file is postprocessed using unroll.pl
* This file is postprocessed using unroll.awk
*/
#include <linux/raid/pq.h>

Просмотреть файл

@ -7,7 +7,7 @@ CC = gcc
OPTFLAGS = -O2 # Adjust as desired
CFLAGS = -I.. -I ../../../include -g $(OPTFLAGS)
LD = ld
PERL = perl
AWK = awk
AR = ar
RANLIB = ranlib
@ -35,35 +35,35 @@ raid6.a: raid6int1.o raid6int2.o raid6int4.o raid6int8.o raid6int16.o \
raid6test: test.c raid6.a
$(CC) $(CFLAGS) -o raid6test $^
raid6altivec1.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 1 < raid6altivec.uc > $@
raid6altivec1.c: raid6altivec.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=1 < raid6altivec.uc > $@
raid6altivec2.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 2 < raid6altivec.uc > $@
raid6altivec2.c: raid6altivec.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=2 < raid6altivec.uc > $@
raid6altivec4.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 4 < raid6altivec.uc > $@
raid6altivec4.c: raid6altivec.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=4 < raid6altivec.uc > $@
raid6altivec8.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 8 < raid6altivec.uc > $@
raid6altivec8.c: raid6altivec.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=8 < raid6altivec.uc > $@
raid6int1.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 1 < raid6int.uc > $@
raid6int1.c: raid6int.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=1 < raid6int.uc > $@
raid6int2.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 2 < raid6int.uc > $@
raid6int2.c: raid6int.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=2 < raid6int.uc > $@
raid6int4.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 4 < raid6int.uc > $@
raid6int4.c: raid6int.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=4 < raid6int.uc > $@
raid6int8.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 8 < raid6int.uc > $@
raid6int8.c: raid6int.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=8 < raid6int.uc > $@
raid6int16.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 16 < raid6int.uc > $@
raid6int16.c: raid6int.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=16 < raid6int.uc > $@
raid6int32.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 32 < raid6int.uc > $@
raid6int32.c: raid6int.uc ../unroll.awk
$(AWK) ../unroll.awk -vN=32 < raid6int.uc > $@
raid6tables.c: mktables
./mktables > raid6tables.c

20
drivers/md/unroll.awk Normal file
Просмотреть файл

@ -0,0 +1,20 @@
# This filter requires one command line option of form -vN=n
# where n must be a decimal number.
#
# Repeat each input line containing $$ n times, replacing $$ with 0...n-1.
# Replace each $# with n, and each $* with a single $.
BEGIN {
n = N + 0
}
{
if (/\$\$/) { rep = n } else { rep = 1 }
for (i = 0; i < rep; ++i) {
tmp = $0
gsub(/\$\$/, i, tmp)
gsub(/\$\#/, n, tmp)
gsub(/\$\*/, "$", tmp)
print tmp
}
}

Просмотреть файл

@ -1,24 +0,0 @@
#!/usr/bin/perl
#
# Take a piece of C code and for each line which contains the sequence $$
# repeat n times with $ replaced by 0...n-1; the sequence $# is replaced
# by the unrolling factor, and $* with a single $
#
($n) = @ARGV;
$n += 0;
while ( defined($line = <STDIN>) ) {
if ( $line =~ /\$\$/ ) {
$rep = $n;
} else {
$rep = 1;
}
for ( $i = 0 ; $i < $rep ; $i++ ) {
$tmp = $line;
$tmp =~ s/\$\$/$i/g;
$tmp =~ s/\$\#/$n/g;
$tmp =~ s/\$\*/\$/g;
print $tmp;
}
}