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dm snapshot: fix hung bios when copy error occurs 

When there is an error copying a chunk dm-snapshot can incorrectly hold
associated bios indefinitely, resulting in hung IO.

The function copy_callback sets pe->error if there was error copying the
chunk, and then calls complete_exception.  complete_exception calls
pending_complete on error, otherwise it calls commit_exception with
commit_callback (and commit_callback calls complete_exception).

The persistent exception store (dm-snap-persistent.c) assumes that calls
to prepare_exception and commit_exception are paired.
persistent_prepare_exception increases ps->pending_count and
persistent_commit_exception decreases it.

If there is a copy error, persistent_prepare_exception is called but
persistent_commit_exception is not.  This results in the variable
ps->pending_count never returning to zero and that causes some pending
exceptions (and their associated bios) to be held forever.

Fix this by unconditionally calling commit_exception regardless of
whether the copy was successful.  A new "valid" parameter is added to
commit_exception -- when the copy fails this parameter is set to zero so
that the chunk that failed to copy (and all following chunks) is not
recorded in the snapshot store.  Also, remove commit_callback now that
it is merely a wrapper around pending_complete.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Mikulas Patocka 2016-01-08 19:07:55 -05:00 committed by Mike Snitzer
parent 1c2e54e1ed
commit 385277bfb5
4 changed files with 12 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/dm-exception-store.h
View File

@ -69,7 +69,7 @@ struct dm_exception_store_type {
* Update the metadata with this exception. * Update the metadata with this exception.
*/ */
void (*commit_exception) (struct dm_exception_store *store, void (*commit_exception) (struct dm_exception_store *store,
struct dm_exception *e, struct dm_exception *e, int valid,
void (*callback) (void *, int success), void (*callback) (void *, int success),
void *callback_context); void *callback_context);

5
drivers/md/dm-snap-persistent.c
View File

@ -695,7 +695,7 @@ static int persistent_prepare_exception(struct dm_exception_store *store,
} }
static void persistent_commit_exception(struct dm_exception_store *store, static void persistent_commit_exception(struct dm_exception_store *store,
struct dm_exception *e, struct dm_exception *e, int valid,
void (*callback) (void *, int success), void (*callback) (void *, int success),
void *callback_context) void *callback_context)
{ {
@ -704,6 +704,9 @@ static void persistent_commit_exception(struct dm_exception_store *store,
struct core_exception ce; struct core_exception ce;
struct commit_callback *cb; struct commit_callback *cb;
if (!valid)
ps->valid = 0;
ce.old_chunk = e->old_chunk; ce.old_chunk = e->old_chunk;
ce.new_chunk = e->new_chunk; ce.new_chunk = e->new_chunk;
write_exception(ps, ps->current_committed++, &ce); write_exception(ps, ps->current_committed++, &ce);

4
drivers/md/dm-snap-transient.c
View File

@ -52,12 +52,12 @@ static int transient_prepare_exception(struct dm_exception_store *store,
} }
static void transient_commit_exception(struct dm_exception_store *store, static void transient_commit_exception(struct dm_exception_store *store,
struct dm_exception *e, struct dm_exception *e, int valid,
void (*callback) (void *, int success), void (*callback) (void *, int success),
void *callback_context) void *callback_context)
{ {
/* Just succeed */ /* Just succeed */
callback(callback_context, 1); callback(callback_context, valid);
} }
static void transient_usage(struct dm_exception_store *store, static void transient_usage(struct dm_exception_store *store,

20
drivers/md/dm-snap.c
View File

@ -1437,8 +1437,9 @@ static void __invalidate_snapshot(struct dm_snapshot *s, int err)
dm_table_event(s->ti->table); dm_table_event(s->ti->table);
} }
static void pending_complete(struct dm_snap_pending_exception *pe, int success) static void pending_complete(void *context, int success)
{ {
struct dm_snap_pending_exception *pe = context;
struct dm_exception *e; struct dm_exception *e;
struct dm_snapshot *s = pe->snap; struct dm_snapshot *s = pe->snap;
struct bio *origin_bios = NULL; struct bio *origin_bios = NULL;
@ -1506,24 +1507,13 @@ out:
free_pending_exception(pe); free_pending_exception(pe);
} }
static void commit_callback(void *context, int success)
{
struct dm_snap_pending_exception *pe = context;
pending_complete(pe, success);
}
static void complete_exception(struct dm_snap_pending_exception *pe) static void complete_exception(struct dm_snap_pending_exception *pe)
{ {
struct dm_snapshot *s = pe->snap; struct dm_snapshot *s = pe->snap;
if (unlikely(pe->copy_error)) /* Update the metadata if we are persistent */
pending_complete(pe, 0); s->store->type->commit_exception(s->store, &pe->e, !pe->copy_error,
pending_complete, pe);
else
/* Update the metadata if we are persistent */
s->store->type->commit_exception(s->store, &pe->e,
commit_callback, pe);
} }
/* /*