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authorLinus Torvalds <torvalds@linux-foundation.org>2017-06-29 14:23:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-06-29 14:23:02 -0700
commit27bc344014289a298a9fad4b828fcf61daa60aff (patch)
tree37b04a28d5afd9e95522889a425b64fae95cd8f2 /drivers
parent374bf8831aa99a445d6d26c56a65fb35db747d91 (diff)
parent00a0ea33b495ee6149bf5a77ac5807ce87323abb (diff)
downloadlinux-27bc344014289a298a9fad4b828fcf61daa60aff.tar.bz2
Merge tag 'for-4.12/dm-fixes-5' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device mapper fixes from Mike Snitzer: - dm thinp fix for crash that will occur when metadata device failure races with discard passdown to the underlying data device. - dm raid fix to not access the superblock's >= 1.9.0 'sectors' member unconditionally. * tag 'for-4.12/dm-fixes-5' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: dm thin: do not queue freed thin mapping for next stage processing dm raid: fix oops on upgrading to extended superblock format
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-raid.c17
-rw-r--r--drivers/md/dm-thin.c26
2 files changed, 27 insertions, 16 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 7d893228c40f..b4b75dad816a 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1927,7 +1927,7 @@ struct dm_raid_superblock {
/********************************************************************
* BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
*
- * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
+ * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
*/
__le32 flags; /* Flags defining array states for reshaping */
@@ -2092,6 +2092,11 @@ static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
sb->layout = cpu_to_le32(mddev->layout);
sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
+ /********************************************************************
+ * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
+ *
+ * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
+ */
sb->new_level = cpu_to_le32(mddev->new_level);
sb->new_layout = cpu_to_le32(mddev->new_layout);
sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
@@ -2438,8 +2443,14 @@ static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
- /* Retrieve device size stored in superblock to be prepared for shrink */
- rdev->sectors = le64_to_cpu(sb->sectors);
+ /*
+ * Retrieve rdev size stored in superblock to be prepared for shrink.
+ * Check extended superblock members are present otherwise the size
+ * will not be set!
+ */
+ if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190)
+ rdev->sectors = le64_to_cpu(sb->sectors);
+
rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
if (rdev->recovery_offset == MaxSector)
set_bit(In_sync, &rdev->flags);
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 17ad50daed08..28808e5ec0fd 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1094,6 +1094,19 @@ static void process_prepared_discard_passdown_pt1(struct dm_thin_new_mapping *m)
return;
}
+ /*
+ * Increment the unmapped blocks. This prevents a race between the
+ * passdown io and reallocation of freed blocks.
+ */
+ r = dm_pool_inc_data_range(pool->pmd, m->data_block, data_end);
+ if (r) {
+ metadata_operation_failed(pool, "dm_pool_inc_data_range", r);
+ bio_io_error(m->bio);
+ cell_defer_no_holder(tc, m->cell);
+ mempool_free(m, pool->mapping_pool);
+ return;
+ }
+
discard_parent = bio_alloc(GFP_NOIO, 1);
if (!discard_parent) {
DMWARN("%s: unable to allocate top level discard bio for passdown. Skipping passdown.",
@@ -1114,19 +1127,6 @@ static void process_prepared_discard_passdown_pt1(struct dm_thin_new_mapping *m)
end_discard(&op, r);
}
}
-
- /*
- * Increment the unmapped blocks. This prevents a race between the
- * passdown io and reallocation of freed blocks.
- */
- r = dm_pool_inc_data_range(pool->pmd, m->data_block, data_end);
- if (r) {
- metadata_operation_failed(pool, "dm_pool_inc_data_range", r);
- bio_io_error(m->bio);
- cell_defer_no_holder(tc, m->cell);
- mempool_free(m, pool->mapping_pool);
- return;
- }
}
static void process_prepared_discard_passdown_pt2(struct dm_thin_new_mapping *m)