This is a note to let you know that I've just added the patch titled
bcachefs: unlock parent dir if entry is not found in subvolume deletion
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcachefs-unlock-parent-dir-if-entry-is-not-found-in-subvolume-deletion.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6bb3f7f4c3f4da8e09de188f2f63e8f741bba3bd Mon Sep 17 00:00:00 2001
From: Guoyu Ou <benogy@xxxxxxxxx>
Date: Sun, 28 Jan 2024 16:46:17 +0800
Subject: bcachefs: unlock parent dir if entry is not found in subvolume deletion
From: Guoyu Ou <benogy@xxxxxxxxx>
commit 6bb3f7f4c3f4da8e09de188f2f63e8f741bba3bd upstream.
Parent dir is locked by user_path_locked_at() before validating the
required dentry. It should be unlocked if we can not perform the
deletion.
This fixes the problem:
$ bcachefs subvolume delete not-exist-entry
BCH_IOCTL_SUBVOLUME_DESTROY ioctl error: No such file or directory
$ bcachefs subvolume delete not-exist-entry
the second will stuck because the parent dir is locked in the previous
deletion.
Signed-off-by: Guoyu Ou <benogy@xxxxxxxxx>
Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/bcachefs/fs-ioctl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/bcachefs/fs-ioctl.c
+++ b/fs/bcachefs/fs-ioctl.c
@@ -463,6 +463,7 @@ static long bch2_ioctl_subvolume_destroy
if (IS_ERR(victim))
return PTR_ERR(victim);
+ dir = d_inode(path.dentry);
if (victim->d_sb->s_fs_info != c) {
ret = -EXDEV;
goto err;
@@ -471,14 +472,13 @@ static long bch2_ioctl_subvolume_destroy
ret = -ENOENT;
goto err;
}
- dir = d_inode(path.dentry);
ret = __bch2_unlink(dir, victim, true);
if (!ret) {
fsnotify_rmdir(dir, victim);
d_delete(victim);
}
- inode_unlock(dir);
err:
+ inode_unlock(dir);
dput(victim);
path_put(&path);
return ret;
Patches currently in stable-queue which might be from benogy@xxxxxxxxx are
queue-6.7/bcachefs-unlock-parent-dir-if-entry-is-not-found-in-subvolume-deletion.patch
