WSL2-Linux-Kernel/drivers/md/dm-log.c

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C
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/*
* Copyright (C) 2003 Sistina Software
*
* This file is released under the LGPL.
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include "dm-log.h"
#include "dm-io.h"
#define DM_MSG_PREFIX "mirror log"
static LIST_HEAD(_log_types);
static DEFINE_SPINLOCK(_lock);
int dm_register_dirty_log_type(struct dirty_log_type *type)
{
spin_lock(&_lock);
type->use_count = 0;
list_add(&type->list, &_log_types);
spin_unlock(&_lock);
return 0;
}
int dm_unregister_dirty_log_type(struct dirty_log_type *type)
{
spin_lock(&_lock);
if (type->use_count)
DMWARN("Attempt to unregister a log type that is still in use");
else
list_del(&type->list);
spin_unlock(&_lock);
return 0;
}
static struct dirty_log_type *get_type(const char *type_name)
{
struct dirty_log_type *type;
spin_lock(&_lock);
list_for_each_entry (type, &_log_types, list)
if (!strcmp(type_name, type->name)) {
if (!type->use_count && !try_module_get(type->module)){
spin_unlock(&_lock);
return NULL;
}
type->use_count++;
spin_unlock(&_lock);
return type;
}
spin_unlock(&_lock);
return NULL;
}
static void put_type(struct dirty_log_type *type)
{
spin_lock(&_lock);
if (!--type->use_count)
module_put(type->module);
spin_unlock(&_lock);
}
struct dirty_log *dm_create_dirty_log(const char *type_name, struct dm_target *ti,
unsigned int argc, char **argv)
{
struct dirty_log_type *type;
struct dirty_log *log;
log = kmalloc(sizeof(*log), GFP_KERNEL);
if (!log)
return NULL;
type = get_type(type_name);
if (!type) {
kfree(log);
return NULL;
}
log->type = type;
if (type->ctr(log, ti, argc, argv)) {
kfree(log);
put_type(type);
return NULL;
}
return log;
}
void dm_destroy_dirty_log(struct dirty_log *log)
{
log->type->dtr(log);
put_type(log->type);
kfree(log);
}
/*-----------------------------------------------------------------
* Persistent and core logs share a lot of their implementation.
* FIXME: need a reload method to be called from a resume
*---------------------------------------------------------------*/
/*
* Magic for persistent mirrors: "MiRr"
*/
#define MIRROR_MAGIC 0x4D695272
/*
* The on-disk version of the metadata.
*/
#define MIRROR_DISK_VERSION 2
#define LOG_OFFSET 2
struct log_header {
uint32_t magic;
/*
* Simple, incrementing version. no backward
* compatibility.
*/
uint32_t version;
sector_t nr_regions;
};
struct log_c {
struct dm_target *ti;
int touched;
uint32_t region_size;
unsigned int region_count;
region_t sync_count;
unsigned bitset_uint32_count;
uint32_t *clean_bits;
uint32_t *sync_bits;
uint32_t *recovering_bits; /* FIXME: this seems excessive */
int sync_search;
/* Resync flag */
enum sync {
DEFAULTSYNC, /* Synchronize if necessary */
NOSYNC, /* Devices known to be already in sync */
FORCESYNC, /* Force a sync to happen */
} sync;
/*
* Disk log fields
*/
struct dm_dev *log_dev;
struct log_header header;
struct io_region header_location;
struct log_header *disk_header;
};
/*
* The touched member needs to be updated every time we access
* one of the bitsets.
*/
static inline int log_test_bit(uint32_t *bs, unsigned bit)
{
return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0;
}
static inline void log_set_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
ext2_set_bit(bit, (unsigned long *) bs);
l->touched = 1;
}
static inline void log_clear_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
ext2_clear_bit(bit, (unsigned long *) bs);
l->touched = 1;
}
/*----------------------------------------------------------------
* Header IO
*--------------------------------------------------------------*/
static void header_to_disk(struct log_header *core, struct log_header *disk)
{
disk->magic = cpu_to_le32(core->magic);
disk->version = cpu_to_le32(core->version);
disk->nr_regions = cpu_to_le64(core->nr_regions);
}
static void header_from_disk(struct log_header *core, struct log_header *disk)
{
core->magic = le32_to_cpu(disk->magic);
core->version = le32_to_cpu(disk->version);
core->nr_regions = le64_to_cpu(disk->nr_regions);
}
static int read_header(struct log_c *log)
{
int r;
unsigned long ebits;
r = dm_io_sync_vm(1, &log->header_location, READ,
log->disk_header, &ebits);
if (r)
return r;
header_from_disk(&log->header, log->disk_header);
/* New log required? */
if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) {
log->header.magic = MIRROR_MAGIC;
log->header.version = MIRROR_DISK_VERSION;
log->header.nr_regions = 0;
}
#ifdef __LITTLE_ENDIAN
if (log->header.version == 1)
log->header.version = 2;
#endif
if (log->header.version != MIRROR_DISK_VERSION) {
DMWARN("incompatible disk log version");
return -EINVAL;
}
return 0;
}
static inline int write_header(struct log_c *log)
{
unsigned long ebits;
header_to_disk(&log->header, log->disk_header);
return dm_io_sync_vm(1, &log->header_location, WRITE,
log->disk_header, &ebits);
}
/*----------------------------------------------------------------
* core log constructor/destructor
*
* argv contains region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
#define BYTE_SHIFT 3
static int create_log_context(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv,
struct dm_dev *dev)
{
enum sync sync = DEFAULTSYNC;
struct log_c *lc;
uint32_t region_size;
unsigned int region_count;
size_t bitset_size, buf_size;
if (argc < 1 || argc > 2) {
DMWARN("wrong number of arguments to mirror log");
return -EINVAL;
}
if (argc > 1) {
if (!strcmp(argv[1], "sync"))
sync = FORCESYNC;
else if (!strcmp(argv[1], "nosync"))
sync = NOSYNC;
else {
DMWARN("unrecognised sync argument to mirror log: %s",
argv[1]);
return -EINVAL;
}
}
if (sscanf(argv[0], "%u", &region_size) != 1) {
DMWARN("invalid region size string");
return -EINVAL;
}
region_count = dm_sector_div_up(ti->len, region_size);
lc = kmalloc(sizeof(*lc), GFP_KERNEL);
if (!lc) {
DMWARN("couldn't allocate core log");
return -ENOMEM;
}
lc->ti = ti;
lc->touched = 0;
lc->region_size = region_size;
lc->region_count = region_count;
lc->sync = sync;
/*
* Work out how many "unsigned long"s we need to hold the bitset.
*/
bitset_size = dm_round_up(region_count,
sizeof(*lc->clean_bits) << BYTE_SHIFT);
bitset_size >>= BYTE_SHIFT;
lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits);
/*
* Disk log?
*/
if (!dev) {
lc->clean_bits = vmalloc(bitset_size);
if (!lc->clean_bits) {
DMWARN("couldn't allocate clean bitset");
kfree(lc);
return -ENOMEM;
}
lc->disk_header = NULL;
} else {
lc->log_dev = dev;
lc->header_location.bdev = lc->log_dev->bdev;
lc->header_location.sector = 0;
/*
* Buffer holds both header and bitset.
*/
buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
bitset_size, ti->limits.hardsect_size);
lc->header_location.count = buf_size >> SECTOR_SHIFT;
lc->disk_header = vmalloc(buf_size);
if (!lc->disk_header) {
DMWARN("couldn't allocate disk log buffer");
kfree(lc);
return -ENOMEM;
}
lc->clean_bits = (void *)lc->disk_header +
(LOG_OFFSET << SECTOR_SHIFT);
}
memset(lc->clean_bits, -1, bitset_size);
lc->sync_bits = vmalloc(bitset_size);
if (!lc->sync_bits) {
DMWARN("couldn't allocate sync bitset");
if (!dev)
vfree(lc->clean_bits);
vfree(lc->disk_header);
kfree(lc);
return -ENOMEM;
}
memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size);
lc->sync_count = (sync == NOSYNC) ? region_count : 0;
lc->recovering_bits = vmalloc(bitset_size);
if (!lc->recovering_bits) {
DMWARN("couldn't allocate sync bitset");
vfree(lc->sync_bits);
if (!dev)
vfree(lc->clean_bits);
vfree(lc->disk_header);
kfree(lc);
return -ENOMEM;
}
memset(lc->recovering_bits, 0, bitset_size);
lc->sync_search = 0;
log->context = lc;
return 0;
}
static int core_ctr(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
return create_log_context(log, ti, argc, argv, NULL);
}
static void destroy_log_context(struct log_c *lc)
{
vfree(lc->sync_bits);
vfree(lc->recovering_bits);
kfree(lc);
}
static void core_dtr(struct dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
vfree(lc->clean_bits);
destroy_log_context(lc);
}
/*----------------------------------------------------------------
* disk log constructor/destructor
*
* argv contains log_device region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
int r;
struct dm_dev *dev;
if (argc < 2 || argc > 3) {
DMWARN("wrong number of arguments to disk mirror log");
return -EINVAL;
}
r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */,
FMODE_READ | FMODE_WRITE, &dev);
if (r)
return r;
r = create_log_context(log, ti, argc - 1, argv + 1, dev);
if (r) {
dm_put_device(ti, dev);
return r;
}
return 0;
}
static void disk_dtr(struct dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
dm_put_device(lc->ti, lc->log_dev);
vfree(lc->disk_header);
destroy_log_context(lc);
}
static int count_bits32(uint32_t *addr, unsigned size)
{
int count = 0, i;
for (i = 0; i < size; i++) {
count += hweight32(*(addr+i));
}
return count;
}
static int disk_resume(struct dirty_log *log)
{
int r;
unsigned i;
struct log_c *lc = (struct log_c *) log->context;
size_t size = lc->bitset_uint32_count * sizeof(uint32_t);
/* read the disk header */
r = read_header(lc);
if (r)
return r;
/* set or clear any new bits -- device has grown */
if (lc->sync == NOSYNC)
for (i = lc->header.nr_regions; i < lc->region_count; i++)
/* FIXME: amazingly inefficient */
log_set_bit(lc, lc->clean_bits, i);
else
for (i = lc->header.nr_regions; i < lc->region_count; i++)
/* FIXME: amazingly inefficient */
log_clear_bit(lc, lc->clean_bits, i);
/* clear any old bits -- device has shrunk */
for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++)
log_clear_bit(lc, lc->clean_bits, i);
/* copy clean across to sync */
memcpy(lc->sync_bits, lc->clean_bits, size);
lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count);
lc->sync_search = 0;
/* set the correct number of regions in the header */
lc->header.nr_regions = lc->region_count;
/* write the new header */
return write_header(lc);
}
static uint32_t core_get_region_size(struct dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
return lc->region_size;
}
static int core_resume(struct dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
lc->sync_search = 0;
return 0;
}
static int core_is_clean(struct dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
return log_test_bit(lc->clean_bits, region);
}
static int core_in_sync(struct dirty_log *log, region_t region, int block)
{
struct log_c *lc = (struct log_c *) log->context;
return log_test_bit(lc->sync_bits, region);
}
static int core_flush(struct dirty_log *log)
{
/* no op */
return 0;
}
static int disk_flush(struct dirty_log *log)
{
int r;
struct log_c *lc = (struct log_c *) log->context;
/* only write if the log has changed */
if (!lc->touched)
return 0;
r = write_header(lc);
if (!r)
lc->touched = 0;
return r;
}
static void core_mark_region(struct dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
log_clear_bit(lc, lc->clean_bits, region);
}
static void core_clear_region(struct dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
log_set_bit(lc, lc->clean_bits, region);
}
static int core_get_resync_work(struct dirty_log *log, region_t *region)
{
struct log_c *lc = (struct log_c *) log->context;
if (lc->sync_search >= lc->region_count)
return 0;
do {
*region = ext2_find_next_zero_bit(
(unsigned long *) lc->sync_bits,
lc->region_count,
lc->sync_search);
lc->sync_search = *region + 1;
[PATCH] make dm-mirror not issue invalid resync requests I've been attempting to set up a (Host)RAID mirror with dm_mirror on 2.6.14.3, and I've been having a strange little problem. The configuration in question is a set of 9GB SCSI disks that have 17942584 sectors. I set up the dm_mirror table as such: 0 17942528 mirror core 2 2048 nosync 2 8:48 0 8:64 0 If I'm not mistaken, this sets up a 9GB RAID1 mriror with 1MB stripes across both SCSI disks. The sector count of the dm device is less than the size of the disks, so we shouldn't fall off the end. However, I always get the messages like this in dmesg when I set up the dm table: attempt to access beyond end of device sdd: rw=0, want=17958656, limit=17942584 Clearly, something is trying to read sectors past the end of the drive. I traced it down to the __rh_recovery_prepare function in dm-raid1.c, which gets called when we're putting the mirror set together. This function calls the dirty region log's get_resync_work function to see if there's any resync that needs to be done, and queues up any areas that are out of sync. The log's get_resync_work function is actually a pointer to the core_get_resync_work function in dm-log.c. The core_get_resync_work function queries a bitset lc->sync_bits to find out if there are any regions that are out of date (i.e. the bit is 0), which is where the problem occurs. If every bit in lc->sync_bits is 1 (which is the case when we've just configured a new RAID1 with the nosync option), the find_next_zero_bit does NOT return the size parameter (lc->region_count in this case), it returns the size parameter rounded up to the nearest multiple of 32! I don't know if this is intentional, but i386 and x86_64 both exhibit this behavior. In any case, the statement "if (*region == lc->region_count)" looks like it's supposed to catch the case where are no regions to resync and return 0. Since find_next_zero_bit apparently has a habit of returning a value that's larger than lc->region_count, the enclosed patch changes the equality test to a greater-than test so that we don't try to resync areas outside of the RAID1 region. Seeing as the HostRAID metadata lives just past the end of the RAID1 data, mucking around in that area is not a good idea. I suppose another way to fix this would be to amend find_next_zero_bit so that it doesn't return values larger than "size", but I don't know if there's a reason for the current behavior. Signed-Off-By: Darrick J. Wong <djwong@us.ibm.com> Acked-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 11:20:11 +03:00
if (*region >= lc->region_count)
return 0;
} while (log_test_bit(lc->recovering_bits, *region));
log_set_bit(lc, lc->recovering_bits, *region);
return 1;
}
static void core_set_region_sync(struct dirty_log *log, region_t region,
int in_sync)
{
struct log_c *lc = (struct log_c *) log->context;
log_clear_bit(lc, lc->recovering_bits, region);
if (in_sync) {
log_set_bit(lc, lc->sync_bits, region);
lc->sync_count++;
} else if (log_test_bit(lc->sync_bits, region)) {
lc->sync_count--;
log_clear_bit(lc, lc->sync_bits, region);
}
}
static region_t core_get_sync_count(struct dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
return lc->sync_count;
}
#define DMEMIT_SYNC \
if (lc->sync != DEFAULTSYNC) \
DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "")
static int core_status(struct dirty_log *log, status_type_t status,
char *result, unsigned int maxlen)
{
int sz = 0;
struct log_c *lc = log->context;
switch(status) {
case STATUSTYPE_INFO:
break;
case STATUSTYPE_TABLE:
DMEMIT("%s %u %u ", log->type->name,
lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size);
DMEMIT_SYNC;
}
return sz;
}
static int disk_status(struct dirty_log *log, status_type_t status,
char *result, unsigned int maxlen)
{
int sz = 0;
char buffer[16];
struct log_c *lc = log->context;
switch(status) {
case STATUSTYPE_INFO:
break;
case STATUSTYPE_TABLE:
format_dev_t(buffer, lc->log_dev->bdev->bd_dev);
DMEMIT("%s %u %s %u ", log->type->name,
lc->sync == DEFAULTSYNC ? 2 : 3, buffer,
lc->region_size);
DMEMIT_SYNC;
}
return sz;
}
static struct dirty_log_type _core_type = {
.name = "core",
.module = THIS_MODULE,
.ctr = core_ctr,
.dtr = core_dtr,
.resume = core_resume,
.get_region_size = core_get_region_size,
.is_clean = core_is_clean,
.in_sync = core_in_sync,
.flush = core_flush,
.mark_region = core_mark_region,
.clear_region = core_clear_region,
.get_resync_work = core_get_resync_work,
.set_region_sync = core_set_region_sync,
.get_sync_count = core_get_sync_count,
.status = core_status,
};
static struct dirty_log_type _disk_type = {
.name = "disk",
.module = THIS_MODULE,
.ctr = disk_ctr,
.dtr = disk_dtr,
.suspend = disk_flush,
.resume = disk_resume,
.get_region_size = core_get_region_size,
.is_clean = core_is_clean,
.in_sync = core_in_sync,
.flush = disk_flush,
.mark_region = core_mark_region,
.clear_region = core_clear_region,
.get_resync_work = core_get_resync_work,
.set_region_sync = core_set_region_sync,
.get_sync_count = core_get_sync_count,
.status = disk_status,
};
int __init dm_dirty_log_init(void)
{
int r;
r = dm_register_dirty_log_type(&_core_type);
if (r)
DMWARN("couldn't register core log");
r = dm_register_dirty_log_type(&_disk_type);
if (r) {
DMWARN("couldn't register disk type");
dm_unregister_dirty_log_type(&_core_type);
}
return r;
}
void dm_dirty_log_exit(void)
{
dm_unregister_dirty_log_type(&_disk_type);
dm_unregister_dirty_log_type(&_core_type);
}
EXPORT_SYMBOL(dm_register_dirty_log_type);
EXPORT_SYMBOL(dm_unregister_dirty_log_type);
EXPORT_SYMBOL(dm_create_dirty_log);
EXPORT_SYMBOL(dm_destroy_dirty_log);