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pipe: don't use ->i_mutex

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

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2013-03-21 02:32:24 -04:00
commit 72b0d9aacb
3 changed files with 7 additions and 6 deletions
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5
fs/pipe.c
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@ -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);