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[PATCH] device-mapper: let freeze_bdev return error

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Allow freeze_bdev() to return an error.

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>
This commit is contained in:
Alasdair G Kergon 2005-05-05 16:16:04 -07:00 • committed by Linus Torvalds
parent 3dcee8064b
commit dfbe03f6d0
1 changed files with 17 additions and 1 deletions
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18
drivers/md/dm.c
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@ -991,22 +991,38 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table)
*/ */
static int __lock_fs(struct mapped_device *md) static int __lock_fs(struct mapped_device *md)
{ {
int error = -ENOMEM;
if (test_and_set_bit(DMF_FS_LOCKED, &md->flags)) if (test_and_set_bit(DMF_FS_LOCKED, &md->flags))
return 0; return 0;
md->frozen_bdev = bdget_disk(md->disk, 0); md->frozen_bdev = bdget_disk(md->disk, 0);
if (!md->frozen_bdev) { if (!md->frozen_bdev) {
DMWARN("bdget failed in __lock_fs"); DMWARN("bdget failed in __lock_fs");
return -ENOMEM; goto out;
} }
WARN_ON(md->frozen_sb); WARN_ON(md->frozen_sb);
md->frozen_sb = freeze_bdev(md->frozen_bdev); md->frozen_sb = freeze_bdev(md->frozen_bdev);
if (IS_ERR(md->frozen_sb)) {
error = PTR_ERR(md->frozen_sb);
goto out_bdput;
}
/* don't bdput right now, we don't want the bdev /* don't bdput right now, we don't want the bdev
* to go away while it is locked. We'll bdput * to go away while it is locked. We'll bdput
* in __unlock_fs * in __unlock_fs
*/ */
return 0; return 0;
out_bdput:
bdput(md->frozen_bdev);
md->frozen_sb = NULL;
md->frozen_bdev = NULL;
out:
clear_bit(DMF_FS_LOCKED, &md->flags);
return error;
} }
static void __unlock_fs(struct mapped_device *md) static void __unlock_fs(struct mapped_device *md)