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| author | Ilya Dryomov <idryomov@gmail.com> | 2017-04-18 18:43:20 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-04-21 14:17:27 -0600 |
| commit | 19b7ccf8651df09d274671b53039c672a52ad84d (patch) | |
| tree | e4190d4d1bede0fdccd797e6dc3eb1ae3659bd4a /include/linux/genhd.h | |
| parent | 8d77bb8276062ff2d991bec71389520dd0156cc3 (diff) | |
| download | linux-19b7ccf8651df09d274671b53039c672a52ad84d.tar.gz linux-19b7ccf8651df09d274671b53039c672a52ad84d.tar.bz2 linux-19b7ccf8651df09d274671b53039c672a52ad84d.zip | |
block: get rid of blk_integrity_revalidate()
Commit 25520d55cdb6 ("block: Inline blk_integrity in struct gendisk")
introduced blk_integrity_revalidate(), which seems to assume ownership
of the stable pages flag and unilaterally clears it if no blk_integrity
profile is registered:
if (bi->profile)
disk->queue->backing_dev_info->capabilities |=
BDI_CAP_STABLE_WRITES;
else
disk->queue->backing_dev_info->capabilities &=
~BDI_CAP_STABLE_WRITES;
It's called from revalidate_disk() and rescan_partitions(), making it
impossible to enable stable pages for drivers that support partitions
and don't use blk_integrity: while the call in revalidate_disk() can be
trivially worked around (see zram, which doesn't support partitions and
hence gets away with zram_revalidate_disk()), rescan_partitions() can
be triggered from userspace at any time. This breaks rbd, where the
ceph messenger is responsible for generating/verifying CRCs.
Since blk_integrity_{un,}register() "must" be used for (un)registering
the integrity profile with the block layer, move BDI_CAP_STABLE_WRITES
setting there. This way drivers that call blk_integrity_register() and
use integrity infrastructure won't interfere with drivers that don't
but still want stable pages.
Fixes: 25520d55cdb6 ("block: Inline blk_integrity in struct gendisk")
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.4+, needs backporting
Tested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 9e11082c7f9b..acff9437e5c3 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -722,11 +722,9 @@ static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) #if defined(CONFIG_BLK_DEV_INTEGRITY) extern void blk_integrity_add(struct gendisk *); extern void blk_integrity_del(struct gendisk *); -extern void blk_integrity_revalidate(struct gendisk *); #else /* CONFIG_BLK_DEV_INTEGRITY */ static inline void blk_integrity_add(struct gendisk *disk) { } static inline void blk_integrity_del(struct gendisk *disk) { } -static inline void blk_integrity_revalidate(struct gendisk *disk) { } #endif /* CONFIG_BLK_DEV_INTEGRITY */ #else /* CONFIG_BLOCK */ |