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| author | Miklos Szeredi <miklos@szeredi.hu> | 2009-04-14 19:48:41 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-04-15 12:10:12 +0200 |
| commit | 61e0d47c33cc371f725bcda4a47ae0efe652dba8 (patch) | |
| tree | e00f99b506f1c1a16e3ba987e3390deda6bd2e03 /include/linux | |
| parent | f8cc774ce4844811a55e2352f1443055e3994e28 (diff) | |
| download | lwn-61e0d47c33cc371f725bcda4a47ae0efe652dba8.tar.gz lwn-61e0d47c33cc371f725bcda4a47ae0efe652dba8.zip | |
splice: add helpers for locking pipe inode
There are lots of sequences like this, especially in splice code:
if (pipe->inode)
mutex_lock(&pipe->inode->i_mutex);
/* do something */
if (pipe->inode)
mutex_unlock(&pipe->inode->i_mutex);
so introduce helpers which do the conditional locking and unlocking.
Also replace the inode_double_lock() call with a pipe_double_lock()
helper to avoid spreading the use of this functionality beyond the
pipe code.
This patch is just a cleanup, and should cause no behavioral changes.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/fs.h | 3 | ||||
| -rw-r--r-- | include/linux/pipe_fs_i.h | 5 |
2 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 907d8f56c6fa..e766be0d4329 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -797,9 +797,6 @@ enum inode_i_mutex_lock_class I_MUTEX_QUOTA }; -extern void inode_double_lock(struct inode *inode1, struct inode *inode2); -extern void inode_double_unlock(struct inode *inode1, struct inode *inode2); - /* * NOTE: in a 32bit arch with a preemptable kernel and * an UP compile the i_size_read/write must be atomic diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index 8e4120285f72..c8f038554e80 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -134,6 +134,11 @@ struct pipe_buf_operations { memory allocation, whereas PIPE_BUF makes atomicity guarantees. */ #define PIPE_SIZE PAGE_SIZE +/* Pipe lock and unlock operations */ +void pipe_lock(struct pipe_inode_info *); +void pipe_unlock(struct pipe_inode_info *); +void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *); + /* Drop the inode semaphore and wait for a pipe event, atomically */ void pipe_wait(struct pipe_inode_info *pipe); |