From: Omar Sandoval <osandov@xxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 64ad6c488975d7516230cf7849190a991fd615ae ]
Since commit bafc9b754f75 ("vfs: More precise tests in d_invalidate"),
mounted subvolumes can be deleted because d_invalidate() won't fail.
However, we run into problems when we attempt to delete the default
subvolume while it is mounted as the root filesystem:
# btrfs subvol list /
ID 257 gen 306 top level 5 path rootvol
ID 267 gen 334 top level 5 path snap1
# btrfs subvol get-default /
ID 267 gen 334 top level 5 path snap1
# btrfs inspect-internal rootid /
267
# mount -o subvol=/ /dev/vda1 /mnt
# btrfs subvol del /mnt/snap1
Delete subvolume (no-commit): '/mnt/snap1'
ERROR: cannot delete '/mnt/snap1' - Operation not permitted
# findmnt /
findmnt: can't read /proc/mounts: No such file or directory
# ls /proc
#
Markus reported that this same scenario simply led to a kernel oops.
This happens because in btrfs_ioctl_snap_destroy(), we call
d_invalidate() before we check may_destroy_subvol(), which means that we
detach the submounts and drop the dentry before erroring out. Instead,
we should only invalidate the dentry once the deletion has succeeded.
Additionally, the shrink_dcache_sb() isn't necessary; d_invalidate()
will prune the dcache for the deleted subvolume.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: bafc9b754f75 ("vfs: More precise tests in d_invalidate")
Reported-by: Markus Schauler <mschauler@xxxxxxxxx>
Signed-off-by: Omar Sandoval <osandov@xxxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
fs/btrfs/ioctl.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index fce3b5b..1cecf25 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2434,8 +2434,6 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
goto out_unlock_inode;
}
- d_invalidate(dentry);
-
down_write(&root->fs_info->subvol_sem);
err = may_destroy_subvol(dest);
@@ -2529,7 +2527,7 @@ out_up_write:
out_unlock_inode:
mutex_unlock(&inode->i_mutex);
if (!err) {
- shrink_dcache_sb(root->fs_info->sb);
+ d_invalidate(dentry);
btrfs_invalidate_inodes(dest);
d_delete(dentry);
ASSERT(dest->send_in_progress == 0);
--
2.1.0
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