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| author | Miklos Szeredi <miklos@szeredi.hu> | 2014-10-27 15:42:01 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-10-28 18:32:47 -0400 |
| commit | d1b72cc6d8cb766c802fdc70a5edc2f0ba8a2b57 (patch) | |
| tree | 35e1ed80b8a78b53538d73bd99525d17def9a7f5 /include/linux/fs.h | |
| parent | c2096537d40f026672c4c6adfcd7247ce5799604 (diff) | |
| download | lwn-d1b72cc6d8cb766c802fdc70a5edc2f0ba8a2b57.tar.gz lwn-d1b72cc6d8cb766c802fdc70a5edc2f0ba8a2b57.zip | |
overlayfs: fix lockdep misannotation
In an overlay directory that shadows an empty lower directory, say
/mnt/a/empty102, do:
touch /mnt/a/empty102/x
unlink /mnt/a/empty102/x
rmdir /mnt/a/empty102
It's actually harmless, but needs another level of nesting between
I_MUTEX_CHILD and I_MUTEX_NORMAL.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 4e41a4a331bb..01036262095f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -639,11 +639,13 @@ static inline int inode_unhashed(struct inode *inode) * 2: child/target * 3: xattr * 4: second non-directory - * The last is for certain operations (such as rename) which lock two + * 5: second parent (when locking independent directories in rename) + * + * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two * non-directories at once. * * The locking order between these classes is - * parent -> child -> normal -> xattr -> second non-directory + * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory */ enum inode_i_mutex_lock_class { @@ -651,7 +653,8 @@ enum inode_i_mutex_lock_class I_MUTEX_PARENT, I_MUTEX_CHILD, I_MUTEX_XATTR, - I_MUTEX_NONDIR2 + I_MUTEX_NONDIR2, + I_MUTEX_PARENT2, }; void lock_two_nondirectories(struct inode *, struct inode*); |