diff options
| author | Alasdair G Kergon <agk@redhat.com> | 2005-05-05 16:16:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-05 16:36:45 -0700 |
| commit | d1782a3b0a15d9ac497a8f47931c4536bfe8d18e (patch) | |
| tree | 76ce9caa1d4c4a1b34ee060fa9f165385a9f1a7e /drivers/md/dm.c | |
| parent | d17d7fa44dbe1f12031773e27eda9e939024a037 (diff) | |
[PATCH] device-mapper: store bdev while frozen
Store the struct block_device while device is frozen, saving us one call to
bdget_disk().
Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
From: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 243ff6884e8..ea180af6d22 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -97,6 +97,7 @@ struct mapped_device { * freeze/thaw support require holding onto a super block */ struct super_block *frozen_sb; + struct block_device *frozen_bdev; }; #define MIN_IOS 256 @@ -990,19 +991,17 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table) */ static int __lock_fs(struct mapped_device *md) { - struct block_device *bdev; - if (test_and_set_bit(DMF_FS_LOCKED, &md->flags)) return 0; - bdev = bdget_disk(md->disk, 0); - if (!bdev) { + md->frozen_bdev = bdget_disk(md->disk, 0); + if (!md->frozen_bdev) { DMWARN("bdget failed in __lock_fs"); return -ENOMEM; } WARN_ON(md->frozen_sb); - md->frozen_sb = freeze_bdev(bdev); + md->frozen_sb = freeze_bdev(md->frozen_bdev); /* don't bdput right now, we don't want the bdev * to go away while it is locked. We'll bdput * in __unlock_fs @@ -1012,21 +1011,15 @@ static int __lock_fs(struct mapped_device *md) static int __unlock_fs(struct mapped_device *md) { - struct block_device *bdev; - if (!test_and_clear_bit(DMF_FS_LOCKED, &md->flags)) return 0; - bdev = bdget_disk(md->disk, 0); - if (!bdev) { - DMWARN("bdget failed in __unlock_fs"); - return -ENOMEM; - } + thaw_bdev(md->frozen_bdev, md->frozen_sb); + bdput(md->frozen_bdev); - thaw_bdev(bdev, md->frozen_sb); md->frozen_sb = NULL; - bdput(bdev); - bdput(bdev); + md->frozen_bdev = NULL; + return 0; } |