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| author | Chuck Lever <chuck.lever@oracle.com> | 2024-02-17 15:23:54 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-21 09:34:25 +0100 |
| commit | ecba88a3b32d733d41e27973e25b2bc580f64281 (patch) | |
| tree | 65716b32a5b06d470298c4feb6de154dbd278f50 /include/linux/fs.h | |
| parent | 7beea725a8ca412c6190090ce7c3a13b169592a1 (diff) | |
| download | lwn-ecba88a3b32d733d41e27973e25b2bc580f64281.tar.gz lwn-ecba88a3b32d733d41e27973e25b2bc580f64281.zip | |
libfs: Add simple_offset_empty()
For simple filesystems that use directory offset mapping, rely
strictly on the directory offset map to tell when a directory has
no children.
After this patch is applied, the emptiness test holds only the RCU
read lock when the directory being tested has no children.
In addition, this adds another layer of confirmation that
simple_offset_add/remove() are working as expected.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://lore.kernel.org/r/170820143463.6328.7872919188371286951.stgit@91.116.238.104.host.secureserver.net
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index ed5966a70495..03d141809a2c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3267,6 +3267,7 @@ struct offset_ctx { void simple_offset_init(struct offset_ctx *octx); int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry); void simple_offset_remove(struct offset_ctx *octx, struct dentry *dentry); +int simple_offset_empty(struct dentry *dentry); int simple_offset_rename_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, |