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pipe: don't use ->i_mutex 

now it can be done - put mutex into pipe_inode_info, use it instead
of ->i_mutex

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-03-21 02:32:24 -04:00
parent ba5bb14733
commit 72b0d9aacb
3 changed files with 7 additions and 6 deletions
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6
fs/ocfs2/file.c
View File

@ -2465,8 +2465,7 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
out->f_path.dentry->d_name.len,
out->f_path.dentry->d_name.name, len);
if (pipe->inode)
mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
pipe_lock(pipe);
splice_from_pipe_begin(&sd);
do {
@ -2486,8 +2485,7 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
} while (ret > 0);
splice_from_pipe_end(pipe, &sd);
if (pipe->inode)
mutex_unlock(&pipe->inode->i_mutex);
pipe_unlock(pipe);
if (sd.num_spliced)
ret = sd.num_spliced;

5
fs/pipe.c
View File

@ -56,7 +56,7 @@ unsigned int pipe_min_size = PAGE_SIZE;
static void pipe_lock_nested(struct pipe_inode_info *pipe, int subclass)
{
if (pipe->inode)
mutex_lock_nested(&pipe->inode->i_mutex, subclass);
mutex_lock_nested(&pipe->mutex, subclass);
}
void pipe_lock(struct pipe_inode_info *pipe)
@ -71,7 +71,7 @@ EXPORT_SYMBOL(pipe_lock);
void pipe_unlock(struct pipe_inode_info *pipe)
{
if (pipe->inode)
mutex_unlock(&pipe->inode->i_mutex);
mutex_unlock(&pipe->mutex);
}
EXPORT_SYMBOL(pipe_unlock);
@ -777,6 +777,7 @@ struct pipe_inode_info * alloc_pipe_info(struct inode *inode)
pipe->r_counter = pipe->w_counter = 1;
pipe->inode = inode;
pipe->buffers = PIPE_DEF_BUFFERS;
mutex_init(&pipe->mutex);
return pipe;
}
kfree(pipe);

2
include/linux/pipe_fs_i.h
View File

@ -27,6 +27,7 @@ struct pipe_buffer {
/**
* struct pipe_inode_info - a linux kernel pipe
* @mutex: mutex protecting the whole thing
* @wait: reader/writer wait point in case of empty/full pipe
* @nrbufs: the number of non-empty pipe buffers in this pipe
* @buffers: total number of buffers (should be a power of 2)
@ -44,6 +45,7 @@ struct pipe_buffer {
* @bufs: the circular array of pipe buffers
**/
struct pipe_inode_info {
struct mutex mutex;
wait_queue_head_t wait;
unsigned int nrbufs, curbuf, buffers;
unsigned int readers;