diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-28 14:09:57 -0800 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2010-12-14 23:40:18 +0100 |
| commit | 23076bfefeb871c22c40f8abad5b5ea7065a265f (patch) | |
| tree | c18725c49e428cd04bec4014aa0a3d8f7e0cd93d /include | |
| parent | 1e6aa82072d3c8267011461d17fbb25c247a3214 (diff) | |
Export 'get_pipe_info()' to other users
commit c66fb347946ebdd5b10908866ecc9fa05ee2cf3d upstream.
And in particular, use it in 'pipe_fcntl()'.
The other pipe functions do not need to use the 'careful' version, since
they are only ever called for things that are already known to be pipes.
The normal read/write/ioctl functions are called through the file
operations structures, so if a file isn't a pipe, they'd never get
called. But pipe_fcntl() is special, and called directly from the
generic fcntl code, and needs to use the same careful function that the
splice code is using.
Cc: Jens Axboe <jaxboe@fusionio.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pipe_fs_i.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index 445796945ac..3c5ac314742 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -161,4 +161,16 @@ void generic_pipe_buf_release(struct pipe_inode_info *, struct pipe_buffer *); /* for F_SETPIPE_SZ and F_GETPIPE_SZ */ long pipe_fcntl(struct file *, unsigned int, unsigned long arg); +/* + * After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same + * location, so checking ->i_pipe is not enough to verify that this is a + * pipe. + */ +static inline struct pipe_inode_info *get_pipe_info(struct file *file) +{ + struct inode *i = file->f_path.dentry->d_inode; + + return S_ISFIFO(i->i_mode) ? i->i_pipe : NULL; +} + #endif |