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Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

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* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm:
  dm snapshot: allow chunk size to be less than page size
  dm snapshot: use unsigned integer chunk size
  dm snapshot: lock snapshot while supplying status
  dm exception store: fix failed set_chunk_size error path
  dm snapshot: require non zero chunk size by end of ctr
  dm: dec_pending needs locking to save error value
  dm: add missing del_gendisk to alloc_dev error path
  dm log: userspace fix incorrect luid cast in userspace_ctr
  dm snapshot: free exception store on init failure
  dm snapshot: sort by chunk size to fix race
This commit is contained in:
Linus Torvalds 2009-10-22 08:25:36 +09:00
commit 1b7607030d
6 changed files with 55 additions and 45 deletions
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38
drivers/md/dm-exception-store.c
View File

@ -138,16 +138,6 @@ int dm_exception_store_type_unregister(struct dm_exception_store_type *type)
}
EXPORT_SYMBOL(dm_exception_store_type_unregister);
/*
* Round a number up to the nearest 'size' boundary. size must
* be a power of 2.
*/
static ulong round_up(ulong n, ulong size)
{
size--;
return (n + size) & ~size;
}
static int set_chunk_size(struct dm_exception_store *store,
const char *chunk_size_arg, char **error)
{
@ -155,7 +145,8 @@ static int set_chunk_size(struct dm_exception_store *store,
char *value;
chunk_size_ulong = simple_strtoul(chunk_size_arg, &value, 10);
if (*chunk_size_arg == '\0' || *value != '\0') {
if (*chunk_size_arg == '\0' || *value != '\0' ||
chunk_size_ulong > UINT_MAX) {
*error = "Invalid chunk size";
return -EINVAL;
}
@ -165,40 +156,35 @@ static int set_chunk_size(struct dm_exception_store *store,
return 0;
}
/*
* Chunk size must be multiple of page size. Silently
* round up if it's not.
*/
chunk_size_ulong = round_up(chunk_size_ulong, PAGE_SIZE >> 9);
return dm_exception_store_set_chunk_size(store, chunk_size_ulong,
return dm_exception_store_set_chunk_size(store,
(unsigned) chunk_size_ulong,
error);
}
int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
unsigned long chunk_size_ulong,
unsigned chunk_size,
char **error)
{
/* Check chunk_size is a power of 2 */
if (!is_power_of_2(chunk_size_ulong)) {
if (!is_power_of_2(chunk_size)) {
*error = "Chunk size is not a power of 2";
return -EINVAL;
}
/* Validate the chunk size against the device block size */
if (chunk_size_ulong % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
if (chunk_size % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
*error = "Chunk size is not a multiple of device blocksize";
return -EINVAL;
}
if (chunk_size_ulong > INT_MAX >> SECTOR_SHIFT) {
if (chunk_size > INT_MAX >> SECTOR_SHIFT) {
*error = "Chunk size is too high";
return -EINVAL;
}
store->chunk_size = chunk_size_ulong;
store->chunk_mask = chunk_size_ulong - 1;
store->chunk_shift = ffs(chunk_size_ulong) - 1;
store->chunk_size = chunk_size;
store->chunk_mask = chunk_size - 1;
store->chunk_shift = ffs(chunk_size) - 1;
return 0;
}
@ -251,7 +237,7 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
r = set_chunk_size(tmp_store, argv[2], &ti->error);
if (r)
goto bad_cow;
goto bad_ctr;
r = type->ctr(tmp_store, 0, NULL);
if (r) {

8
drivers/md/dm-exception-store.h
View File

@ -101,9 +101,9 @@ struct dm_exception_store {
struct dm_dev *cow;
/* Size of data blocks saved - must be a power of 2 */
chunk_t chunk_size;
chunk_t chunk_mask;
chunk_t chunk_shift;
unsigned chunk_size;
unsigned chunk_mask;
unsigned chunk_shift;
void *context;
};
@ -169,7 +169,7 @@ int dm_exception_store_type_register(struct dm_exception_store_type *type);
int dm_exception_store_type_unregister(struct dm_exception_store_type *type);
int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
unsigned long chunk_size_ulong,
unsigned chunk_size,
char **error);
int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,

2
drivers/md/dm-log-userspace-base.c
View File

@ -156,7 +156,7 @@ static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti,
}
/* The ptr value is sufficient for local unique id */
lc->luid = (uint64_t)lc;
lc->luid = (unsigned long)lc;
lc->ti = ti;

16
drivers/md/dm-snap-persistent.c
View File

@ -284,12 +284,13 @@ static int read_header(struct pstore *ps, int *new_snapshot)
{
int r;
struct disk_header *dh;
chunk_t chunk_size;
unsigned chunk_size;
int chunk_size_supplied = 1;
char *chunk_err;
/*
* Use default chunk size (or hardsect_size, if larger) if none supplied
* Use default chunk size (or logical_block_size, if larger)
* if none supplied
*/
if (!ps->store->chunk_size) {
ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
@ -334,10 +335,9 @@ static int read_header(struct pstore *ps, int *new_snapshot)
return 0;
if (chunk_size_supplied)
DMWARN("chunk size %llu in device metadata overrides "
"table chunk size of %llu.",
(unsigned long long)chunk_size,
(unsigned long long)ps->store->chunk_size);
DMWARN("chunk size %u in device metadata overrides "
"table chunk size of %u.",
chunk_size, ps->store->chunk_size);
/* We had a bogus chunk_size. Fix stuff up. */
free_area(ps);
@ -345,8 +345,8 @@ static int read_header(struct pstore *ps, int *new_snapshot)
r = dm_exception_store_set_chunk_size(ps->store, chunk_size,
&chunk_err);
if (r) {
DMERR("invalid on-disk chunk size %llu: %s.",
(unsigned long long)chunk_size, chunk_err);
DMERR("invalid on-disk chunk size %u: %s.",
chunk_size, chunk_err);
return r;
}

25
drivers/md/dm-snap.c
View File

@ -296,6 +296,7 @@ static void __insert_origin(struct origin *o)
*/
static int register_snapshot(struct dm_snapshot *snap)
{
struct dm_snapshot *l;
struct origin *o, *new_o;
struct block_device *bdev = snap->origin->bdev;
@ -319,7 +320,11 @@ static int register_snapshot(struct dm_snapshot *snap)
__insert_origin(o);
}
list_add_tail(&snap->list, &o->snapshots);
/* Sort the list according to chunk size, largest-first smallest-last */
list_for_each_entry(l, &o->snapshots, list)
if (l->store->chunk_size < snap->store->chunk_size)
break;
list_add_tail(&snap->list, &l->list);
up_write(&_origins_lock);
return 0;
@ -668,6 +673,11 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
bio_list_init(&s->queued_bios);
INIT_WORK(&s->queued_bios_work, flush_queued_bios);
if (!s->store->chunk_size) {
ti->error = "Chunk size not set";
goto bad_load_and_register;
}
/* Add snapshot to the list of snapshots for this origin */
/* Exceptions aren't triggered till snapshot_resume() is called */
if (register_snapshot(s)) {
@ -951,7 +961,7 @@ static void start_copy(struct dm_snap_pending_exception *pe)
src.bdev = bdev;
src.sector = chunk_to_sector(s->store, pe->e.old_chunk);
src.count = min(s->store->chunk_size, dev_size - src.sector);
src.count = min((sector_t)s->store->chunk_size, dev_size - src.sector);
dest.bdev = s->store->cow->bdev;
dest.sector = chunk_to_sector(s->store, pe->e.new_chunk);
@ -1142,6 +1152,8 @@ static int snapshot_status(struct dm_target *ti, status_type_t type,
unsigned sz = 0;
struct dm_snapshot *snap = ti->private;
down_write(&snap->lock);
switch (type) {
case STATUSTYPE_INFO:
if (!snap->valid)
@ -1173,6 +1185,8 @@ static int snapshot_status(struct dm_target *ti, status_type_t type,
break;
}
up_write(&snap->lock);
return 0;
}
@ -1388,7 +1402,7 @@ static void origin_resume(struct dm_target *ti)
struct dm_dev *dev = ti->private;
struct dm_snapshot *snap;
struct origin *o;
chunk_t chunk_size = 0;
unsigned chunk_size = 0;
down_read(&_origins_lock);
o = __lookup_origin(dev->bdev);
@ -1465,7 +1479,7 @@ static int __init dm_snapshot_init(void)
r = dm_register_target(&snapshot_target);
if (r) {
DMERR("snapshot target register failed %d", r);
return r;
goto bad_register_snapshot_target;
}
r = dm_register_target(&origin_target);
@ -1522,6 +1536,9 @@ bad2:
dm_unregister_target(&origin_target);
bad1:
dm_unregister_target(&snapshot_target);
bad_register_snapshot_target:
dm_exception_store_exit();
return r;
}

11
drivers/md/dm.c
View File

@ -47,6 +47,7 @@ struct dm_io {
atomic_t io_count;
struct bio *bio;
unsigned long start_time;
spinlock_t endio_lock;
};
/*
@ -578,8 +579,12 @@ static void dec_pending(struct dm_io *io, int error)
struct mapped_device *md = io->md;
/* Push-back supersedes any I/O errors */
if (error && !(io->error > 0 && __noflush_suspending(md)))
io->error = error;
if (unlikely(error)) {
spin_lock_irqsave(&io->endio_lock, flags);
if (!(io->error > 0 && __noflush_suspending(md)))
io->error = error;
spin_unlock_irqrestore(&io->endio_lock, flags);
}
if (atomic_dec_and_test(&io->io_count)) {
if (io->error == DM_ENDIO_REQUEUE) {
@ -1226,6 +1231,7 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
atomic_set(&ci.io->io_count, 1);
ci.io->bio = bio;
ci.io->md = md;
spin_lock_init(&ci.io->endio_lock);
ci.sector = bio->bi_sector;
ci.sector_count = bio_sectors(bio);
if (unlikely(bio_empty_barrier(bio)))
@ -1822,6 +1828,7 @@ static struct mapped_device *alloc_dev(int minor)
bad_bdev:
destroy_workqueue(md->wq);
bad_thread:
del_gendisk(md->disk);
put_disk(md->disk);
bad_disk:
blk_cleanup_queue(md->queue);