Btrfs: fix trim 0 bytes after a device delete

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A user reported a bug of btrfs's trim, that is we will trim 0 bytes
after a device delete.

The reproducer:

$ mkfs.btrfs disk1
$ mkfs.btrfs disk2
$ mount disk1 /mnt
$ fstrim -v /mnt
$ btrfs device add disk2 /mnt
$ btrfs device del disk1 /mnt
$ fstrim -v /mnt

This is because after we delete the device, the block group may start from
a non-zero place, which will confuse trim to discard nothing.

Reported-by: Lutz Euler <lutz.euler@freenet.de>
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>

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This commit is contained in:

Liu Bo 2012-02-09 18:17:41 +08:00 • committed by David Sterba

parent 6af021d8fc

commit 2cac13e41b

1 changed files with 8 additions and 1 deletions

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fs/btrfs/extent-tree.c

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