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btrfs: don't return EINTR

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It is basically a good thing if we are interruptible when waiting for
free space, but the generality in which it is implemented currently
leads to system calls being interruptible that are not documented this
way. For example git can't handle interrupted unlink(), leading to
corrupt repos under space pressure.
Instead we raise the bar to only be interruptible by SIGKILL.
Thanks to David Sterba for suggesting this.

Signed-off-by: Arne Jansen <sensille@gmx.net>
This commit is contained in:
Arne Jansen 2012-04-18 10:27:16 +02:00 committed by David Sterba
parent 253beebd5a
commit b9688bb845
1 changed files with 3 additions and 6 deletions
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9
fs/btrfs/extent-tree.c
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@ -3771,13 +3771,10 @@ static int reserve_metadata_bytes(struct btrfs_root *root,
*/
if (current->journal_info)
return -EAGAIN;
ret = wait_event_interruptible(space_info->wait,
!space_info->flush);
/* Must have been interrupted, return */
if (ret) {
printk(KERN_DEBUG "btrfs: %s returning -EINTR\n", __func__);
ret = wait_event_killable(space_info->wait, !space_info->flush);
/* Must have been killed, return */
if (ret)
return -EINTR;
}
spin_lock(&space_info->lock);
}