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authorJoe Thornber <ejt@redhat.com>2014-12-11 11:12:19 +0000
committerMike Snitzer <snitzer@redhat.com>2014-12-17 11:59:36 -0500
commit2c43fd26e46734430122b8d2ad3024bb532df3ef (patch)
treed0166f1fe97d83eef8f51a633201b817e309734b /drivers/md/dm-thin.c
parent45ec9bd0fd7abf8705e7cf12205ff69fe9d51181 (diff)
downloadlinux-2c43fd26e46734430122b8d2ad3024bb532df3ef.tar.gz
dm thin: fix missing out-of-data-space to write mode transition if blocks are released
Discard bios and thin device deletion have the potential to release data blocks. If the thin-pool is in out-of-data-space mode, and blocks were released, transition the thin-pool back to full write mode. The correct time to do this is just after the thin-pool metadata commit. It cannot be done before the commit because the space maps will not allow immediate reuse of the data blocks in case there's a rollback following power failure. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-thin.c')
-rw-r--r--drivers/md/dm-thin.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 14b51a4fdf6b..922aa553e9e0 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1127,6 +1127,24 @@ static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block,
schedule_zero(tc, virt_block, data_dest, cell, bio);
}
+static void set_pool_mode(struct pool *pool, enum pool_mode new_mode);
+
+static void check_for_space(struct pool *pool)
+{
+ int r;
+ dm_block_t nr_free;
+
+ if (get_pool_mode(pool) != PM_OUT_OF_DATA_SPACE)
+ return;
+
+ r = dm_pool_get_free_block_count(pool->pmd, &nr_free);
+ if (r)
+ return;
+
+ if (nr_free)
+ set_pool_mode(pool, PM_WRITE);
+}
+
/*
* A non-zero return indicates read_only or fail_io mode.
* Many callers don't care about the return value.
@@ -1141,6 +1159,8 @@ static int commit(struct pool *pool)
r = dm_pool_commit_metadata(pool->pmd);
if (r)
metadata_operation_failed(pool, "dm_pool_commit_metadata", r);
+ else
+ check_for_space(pool);
return r;
}
@@ -1159,8 +1179,6 @@ static void check_low_water_mark(struct pool *pool, dm_block_t free_blocks)
}
}
-static void set_pool_mode(struct pool *pool, enum pool_mode new_mode);
-
static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
{
int r;