diff options
Diffstat (limited to 'fs/pipe.c')
| -rw-r--r-- | fs/pipe.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/fs/pipe.c b/fs/pipe.c index bdd3f96054b..541d6626f9d 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -230,6 +230,7 @@ void *generic_pipe_buf_map(struct pipe_inode_info *pipe, return kmap(buf->page); } +EXPORT_SYMBOL(generic_pipe_buf_map); /** * generic_pipe_buf_unmap - unmap a previously mapped pipe buffer @@ -249,6 +250,7 @@ void generic_pipe_buf_unmap(struct pipe_inode_info *pipe, } else kunmap(buf->page); } +EXPORT_SYMBOL(generic_pipe_buf_unmap); /** * generic_pipe_buf_steal - attempt to take ownership of a &pipe_buffer @@ -279,6 +281,7 @@ int generic_pipe_buf_steal(struct pipe_inode_info *pipe, return 1; } +EXPORT_SYMBOL(generic_pipe_buf_steal); /** * generic_pipe_buf_get - get a reference to a &struct pipe_buffer @@ -294,6 +297,7 @@ void generic_pipe_buf_get(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { page_cache_get(buf->page); } +EXPORT_SYMBOL(generic_pipe_buf_get); /** * generic_pipe_buf_confirm - verify contents of the pipe buffer @@ -309,6 +313,7 @@ int generic_pipe_buf_confirm(struct pipe_inode_info *info, { return 0; } +EXPORT_SYMBOL(generic_pipe_buf_confirm); /** * generic_pipe_buf_release - put a reference to a &struct pipe_buffer @@ -323,6 +328,7 @@ void generic_pipe_buf_release(struct pipe_inode_info *pipe, { page_cache_release(buf->page); } +EXPORT_SYMBOL(generic_pipe_buf_release); static const struct pipe_buf_operations anon_pipe_buf_ops = { .can_merge = 1, @@ -1172,16 +1178,20 @@ long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg) nr_pages = (arg + PAGE_SIZE - 1) >> PAGE_SHIFT; nr_pages = roundup_pow_of_two(nr_pages); - if (!capable(CAP_SYS_ADMIN) && nr_pages > pipe_max_pages) - return -EPERM; + if (!capable(CAP_SYS_ADMIN) && nr_pages > pipe_max_pages) { + ret = -EPERM; + goto out; + } /* * The pipe needs to be at least 2 pages large to * guarantee POSIX behaviour. */ - if (nr_pages < 2) - return -EINVAL; - ret = pipe_set_size(pipe, nr_pages); + if (arg < 2) { + ret = -EINVAL; + goto out; + } + ret = pipe_set_size(pipe, arg); break; } case F_GETPIPE_SZ: @@ -1192,6 +1202,7 @@ long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg) break; } +out: mutex_unlock(&pipe->inode->i_mutex); return ret; } |