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- Fix a particularly nasty DM core bug in a 4.15 refcount_t conversion.

Browse Source 
- Fix various targets to dm_register_target after module __init
   resources created; otherwise racing lvm2 commands could result in a
   NULL pointer during initialization of associated DM kernel module.
 
 - Fix regression in bio-based DM multipath queue_if_no_path handling.
 
 - Fix DM bufio's shrinker to reclaim more than one buffer per scan.
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Merge tag 'for-4.15/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - fix a particularly nasty DM core bug in a 4.15 refcount_t conversion.

 - fix various targets to dm_register_target after module __init
   resources created; otherwise racing lvm2 commands could result in a
   NULL pointer during initialization of associated DM kernel module.

 - fix regression in bio-based DM multipath queue_if_no_path handling.

 - fix DM bufio's shrinker to reclaim more than one buffer per scan.

* tag 'for-4.15/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm bufio: fix shrinker scans when (nr_to_scan < retain_target)
  dm mpath: fix bio-based multipath queue_if_no_path handling
  dm: fix various targets to dm_register_target after module __init resources created
  dm table: fix regression from improper dm_dev_internal.count refcount_t conversion
This commit is contained in:
Linus Torvalds 2017-12-15 12:53:37 -08:00
commit ee1b43ece1
6 changed files with 100 additions and 62 deletions
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8
drivers/md/dm-bufio.c
View File

@ -1611,7 +1611,8 @@ static unsigned long __scan(struct dm_bufio_client *c, unsigned long nr_to_scan,
int l;
struct dm_buffer *b, *tmp;
unsigned long freed = 0;
unsigned long count = nr_to_scan;
unsigned long count = c->n_buffers[LIST_CLEAN] +
c->n_buffers[LIST_DIRTY];
unsigned long retain_target = get_retain_buffers(c);
for (l = 0; l < LIST_SIZE; l++) {
@ -1647,8 +1648,11 @@ static unsigned long
dm_bufio_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
{
struct dm_bufio_client *c = container_of(shrink, struct dm_bufio_client, shrinker);
unsigned long count = READ_ONCE(c->n_buffers[LIST_CLEAN]) +
READ_ONCE(c->n_buffers[LIST_DIRTY]);
unsigned long retain_target = get_retain_buffers(c);
return READ_ONCE(c->n_buffers[LIST_CLEAN]) + READ_ONCE(c->n_buffers[LIST_DIRTY]);
return (count < retain_target) ? 0 : (count - retain_target);
}
/*

12
drivers/md/dm-cache-target.c
View File

@ -3472,18 +3472,18 @@ static int __init dm_cache_init(void)
{
int r;
r = dm_register_target(&cache_target);
if (r) {
DMERR("cache target registration failed: %d", r);
return r;
}
migration_cache = KMEM_CACHE(dm_cache_migration, 0);
if (!migration_cache) {
dm_unregister_target(&cache_target);
return -ENOMEM;
}
r = dm_register_target(&cache_target);
if (r) {
DMERR("cache target registration failed: %d", r);
return r;
}
return 0;
}

67
drivers/md/dm-mpath.c
View File

@ -457,6 +457,38 @@ do { \
dm_noflush_suspending((m)->ti)); \
} while (0)
/*
* Check whether bios must be queued in the device-mapper core rather
* than here in the target.
*
* If MPATHF_QUEUE_IF_NO_PATH and MPATHF_SAVED_QUEUE_IF_NO_PATH hold
* the same value then we are not between multipath_presuspend()
* and multipath_resume() calls and we have no need to check
* for the DMF_NOFLUSH_SUSPENDING flag.
*/
static bool __must_push_back(struct multipath *m, unsigned long flags)
{
return ((test_bit(MPATHF_QUEUE_IF_NO_PATH, &flags) !=
test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &flags)) &&
dm_noflush_suspending(m->ti));
}
/*
* Following functions use READ_ONCE to get atomic access to
* all m->flags to avoid taking spinlock
*/
static bool must_push_back_rq(struct multipath *m)
{
unsigned long flags = READ_ONCE(m->flags);
return test_bit(MPATHF_QUEUE_IF_NO_PATH, &flags) || __must_push_back(m, flags);
}
static bool must_push_back_bio(struct multipath *m)
{
unsigned long flags = READ_ONCE(m->flags);
return __must_push_back(m, flags);
}
/*
* Map cloned requests (request-based multipath)
*/
@ -478,7 +510,7 @@ static int multipath_clone_and_map(struct dm_target *ti, struct request *rq,
pgpath = choose_pgpath(m, nr_bytes);
if (!pgpath) {
if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))
if (must_push_back_rq(m))
return DM_MAPIO_DELAY_REQUEUE;
dm_report_EIO(m); /* Failed */
return DM_MAPIO_KILL;
@ -553,7 +585,7 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
}
if (!pgpath) {
if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))
if (must_push_back_bio(m))
return DM_MAPIO_REQUEUE;
dm_report_EIO(m);
return DM_MAPIO_KILL;
@ -651,8 +683,7 @@ static int queue_if_no_path(struct multipath *m, bool queue_if_no_path,
assign_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags,
(save_old_value && test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) ||
(!save_old_value && queue_if_no_path));
assign_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags,
queue_if_no_path || dm_noflush_suspending(m->ti));
assign_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags, queue_if_no_path);
spin_unlock_irqrestore(&m->lock, flags);
if (!queue_if_no_path) {
@ -1486,7 +1517,7 @@ static int multipath_end_io(struct dm_target *ti, struct request *clone,
fail_path(pgpath);
if (atomic_read(&m->nr_valid_paths) == 0 &&
!test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) {
!must_push_back_rq(m)) {
if (error == BLK_STS_IOERR)
dm_report_EIO(m);
/* complete with the original error */
@ -1521,8 +1552,12 @@ static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone,
if (atomic_read(&m->nr_valid_paths) == 0 &&
!test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) {
dm_report_EIO(m);
*error = BLK_STS_IOERR;
if (must_push_back_bio(m)) {
r = DM_ENDIO_REQUEUE;
} else {
dm_report_EIO(m);
*error = BLK_STS_IOERR;
}
goto done;
}
@ -1957,13 +1992,6 @@ static int __init dm_multipath_init(void)
{
int r;
r = dm_register_target(&multipath_target);
if (r < 0) {
DMERR("request-based register failed %d", r);
r = -EINVAL;
goto bad_register_target;
}
kmultipathd = alloc_workqueue("kmpathd", WQ_MEM_RECLAIM, 0);
if (!kmultipathd) {
DMERR("failed to create workqueue kmpathd");
@ -1985,13 +2013,20 @@ static int __init dm_multipath_init(void)
goto bad_alloc_kmpath_handlerd;
}
r = dm_register_target(&multipath_target);
if (r < 0) {
DMERR("request-based register failed %d", r);
r = -EINVAL;
goto bad_register_target;
}
return 0;
bad_register_target:
destroy_workqueue(kmpath_handlerd);
bad_alloc_kmpath_handlerd:
destroy_workqueue(kmultipathd);
bad_alloc_kmultipathd:
dm_unregister_target(&multipath_target);
bad_register_target:
return r;
}

48
drivers/md/dm-snap.c
View File

@ -2411,24 +2411,6 @@ static int __init dm_snapshot_init(void)
return r;
}
r = dm_register_target(&snapshot_target);
if (r < 0) {
DMERR("snapshot target register failed %d", r);
goto bad_register_snapshot_target;
}
r = dm_register_target(&origin_target);
if (r < 0) {
DMERR("Origin target register failed %d", r);
goto bad_register_origin_target;
}
r = dm_register_target(&merge_target);
if (r < 0) {
DMERR("Merge target register failed %d", r);
goto bad_register_merge_target;
}
r = init_origin_hash();
if (r) {
DMERR("init_origin_hash failed.");
@ -2449,19 +2431,37 @@ static int __init dm_snapshot_init(void)
goto bad_pending_cache;
}
r = dm_register_target(&snapshot_target);
if (r < 0) {
DMERR("snapshot target register failed %d", r);
goto bad_register_snapshot_target;
}
r = dm_register_target(&origin_target);
if (r < 0) {
DMERR("Origin target register failed %d", r);
goto bad_register_origin_target;
}
r = dm_register_target(&merge_target);
if (r < 0) {
DMERR("Merge target register failed %d", r);
goto bad_register_merge_target;
}
return 0;
bad_pending_cache:
kmem_cache_destroy(exception_cache);
bad_exception_cache:
exit_origin_hash();
bad_origin_hash:
dm_unregister_target(&merge_target);
bad_register_merge_target:
dm_unregister_target(&origin_target);
bad_register_origin_target:
dm_unregister_target(&snapshot_target);
bad_register_snapshot_target:
kmem_cache_destroy(pending_cache);
bad_pending_cache:
kmem_cache_destroy(exception_cache);
bad_exception_cache:
exit_origin_hash();
bad_origin_hash:
dm_exception_store_exit();
return r;

5
drivers/md/dm-table.c
View File

@ -453,14 +453,15 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
refcount_set(&dd->count, 1);
list_add(&dd->list, &t->devices);
goto out;
} else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) {
r = upgrade_mode(dd, mode, t->md);
if (r)
return r;
refcount_inc(&dd->count);
}
refcount_inc(&dd->count);
out:
*result = dd->dm_dev;
return 0;
}

22
drivers/md/dm-thin.c
View File

@ -4355,30 +4355,28 @@ static struct target_type thin_target = {
static int __init dm_thin_init(void)
{
int r;
int r = -ENOMEM;
pool_table_init();
_new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0);
if (!_new_mapping_cache)
return r;
r = dm_register_target(&thin_target);
if (r)
return r;
goto bad_new_mapping_cache;
r = dm_register_target(&pool_target);
if (r)
goto bad_pool_target;
r = -ENOMEM;
_new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0);
if (!_new_mapping_cache)
goto bad_new_mapping_cache;
goto bad_thin_target;
return 0;
bad_new_mapping_cache:
dm_unregister_target(&pool_target);
bad_pool_target:
bad_thin_target:
dm_unregister_target(&thin_target);
bad_new_mapping_cache:
kmem_cache_destroy(_new_mapping_cache);
return r;
}