block: get rid of blk_integrity_revalidate()

commit 19b7ccf8651df09d274671b53039c672a52ad84d upstream.

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>
Tested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
[idryomov@gmail.com: backport to < 4.11: bdi is embedded in queue]
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 2 insertions, 21 deletions

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index d69c5c79f98e..319f2e4f4a8b 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -417,7 +417,7 @@ void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template
         bi->tuple_size = template->tuple_size;
         bi->tag_size = template->tag_size;
 
-        blk_integrity_revalidate(disk);
+        disk->queue->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES;
 }
 EXPORT_SYMBOL(blk_integrity_register);
 
@@ -430,26 +430,11 @@ EXPORT_SYMBOL(blk_integrity_register);
  */
 void blk_integrity_unregister(struct gendisk *disk)
 {
-        blk_integrity_revalidate(disk);
+        disk->queue->backing_dev_info.capabilities &= ~BDI_CAP_STABLE_WRITES;
         memset(&disk->queue->integrity, 0, sizeof(struct blk_integrity));
 }
 EXPORT_SYMBOL(blk_integrity_unregister);
 
-void blk_integrity_revalidate(struct gendisk *disk)
-{
-        struct blk_integrity *bi = &disk->queue->integrity;
-
-        if (!(disk->flags & GENHD_FL_UP))
-                return;
-
-        if (bi->profile)
-                disk->queue->backing_dev_info.capabilities |=
-                        BDI_CAP_STABLE_WRITES;
-        else
-                disk->queue->backing_dev_info.capabilities &=
-                        ~BDI_CAP_STABLE_WRITES;
-}
-
 void blk_integrity_add(struct gendisk *disk)
 {
         if (kobject_init_and_add(&disk->integrity_kobj, &integrity_ktype,
diff --git a/block/partition-generic.c b/block/partition-generic.c
index 71d9ed9df8da..a2437c006640 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -447,7 +447,6 @@ rescan:
 
         if (disk->fops->revalidate_disk)
                 disk->fops->revalidate_disk(disk);
-        blk_integrity_revalidate(disk);
         check_disk_size_change(disk, bdev);
         bdev->bd_invalidated = 0;
         if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 092a2eed1628..9ad527ff9974 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1165,7 +1165,6 @@ int revalidate_disk(struct gendisk *disk)
 
         if (disk->fops->revalidate_disk)
                 ret = disk->fops->revalidate_disk(disk);
-        blk_integrity_revalidate(disk);
         bdev = bdget_disk(disk, 0);
         if (!bdev)
                 return ret;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index e0341af6950e..3c99fb6727ca 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -731,11 +731,9 @@ 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 */