diff options
| author | David Howells <dhowells@redhat.com> | 2017-12-01 11:40:16 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2020-05-31 15:19:44 +0100 |
| commit | 3f19b2ab97a97b413c24b66c67ae16daa4f56c35 (patch) | |
| tree | fd6be1d0f2b76589c05361dd95fefc365408529c /include | |
| parent | 9cb1fd0efd195590b828b9b865421ad345a4a145 (diff) | |
vfs, afs, ext4: Make the inode hash table RCU searchable
Make the inode hash table RCU searchable so that searches that want to
access or modify an inode without taking a ref on that inode can do so
without taking the inode hash table lock.
The main thing this requires is some RCU annotation on the list
manipulation operations. Inodes are already freed by RCU in most cases.
Users of this interface must take care as the inode may be still under
construction or may be being torn down around them.
There are at least three instances where this can be of use:
(1) Testing whether the inode number iunique() is going to return is
currently unique (the iunique_lock is still held).
(2) Ext4 date stamp updating.
(3) AFS callback breaking.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
cc: linux-ext4@vger.kernel.org
cc: linux-afs@lists.infradead.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 45cc10cdf6dd..5f9b2bb4b44f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3070,6 +3070,9 @@ extern struct inode *find_inode_nowait(struct super_block *, int (*match)(struct inode *, unsigned long, void *), void *data); +extern struct inode *find_inode_rcu(struct super_block *, unsigned long, + int (*)(struct inode *, void *), void *); +extern struct inode *find_inode_by_ino_rcu(struct super_block *, unsigned long); extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); extern int insert_inode_locked(struct inode *); #ifdef CONFIG_DEBUG_LOCK_ALLOC |