linux-toradex.git/fs/pipe.c, branch v2.6.37.2

Un-inline get_pipe_info() helper function

2010-11-29T00:27:19+00:00

This avoids some include-file hell, and the function isn't really
important enough to be inlined anyway.

Reported-by: Ingo Molnar 
Signed-off-by: Linus Torvalds

Export 'get_pipe_info()' to other users

2010-11-28T22:09:57+00:00

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 
Cc: Andrew Morton 
Cc: Al Viro 
Cc: Dave Jones 
Signed-off-by: Linus Torvalds

convert get_sb_pseudo() users

2010-10-29T08:16:33+00:00

Signed-off-by: Al Viro

fs: do not assign default i_ino in new_inode

2010-10-26T01:26:11+00:00

Instead of always assigning an increasing inode number in new_inode
move the call to assign it into those callers that actually need it.
For now callers that need it is estimated conservatively, that is
the call is added to all filesystems that do not assign an i_ino
by themselves.  For a few more filesystems we can avoid assigning
any inode number given that they aren't user visible, and for others
it could be done lazily when an inode number is actually needed,
but that's left for later patches.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Dave Chinner 
Signed-off-by: Al Viro

pipe: fix failure to return error code on ->confirm()

2010-10-21T12:56:33+00:00

The arguments were transposed, we want to assign the error code to
'ret', which is being returned.

Signed-off-by: Nicolas Kaiser 
Cc: stable@kernel.org
Signed-off-by: Jens Axboe

pipe: fix check in "set size" fcntl

2010-06-10T17:08:34+00:00

As it stands this check compares the number of pages to the page size.
This makes no sense and makes the fcntl fail in almost any sane case.

Fix it by checking if nr_pages is not zero (it can become zero only if
arg is too big and round_pipe_size() overflows).

Signed-off-by: Miklos Szeredi 
Signed-off-by: Jens Axboe

pipe: fix pipe buffer resizing

2010-06-10T17:08:34+00:00

pipe_set_size() needs to copy pipe bufs from the old circular buffer
to the new.

The current code gets this wrong in multiple ways, resulting in oops.

Test program is available here:
  http://www.kernel.org/pub/linux/kernel/people/mszeredi/piperesize/

Signed-off-by: Miklos Szeredi 
Signed-off-by: Jens Axboe

pipe: change /proc/sys/fs/pipe-max-pages to byte sized interface

2010-06-03T12:54:39+00:00

This changes the interface to be based on bytes instead. The API
matches that of F_SETPIPE_SZ in that it rounds up the passed in
size so that the resulting page array is a power-of-2 in size.

The proc file is renamed to /proc/sys/fs/pipe-max-size to
reflect this change.

Signed-off-by: Jens Axboe

pipe: change the privilege required for growing a pipe beyond system max

2010-06-03T10:45:28+00:00

Change it to CAP_SYS_RESOURCE, as that more accurately models what
we want to control.

Suggested-by: Michael Kerrisk 
Signed-off-by: Jens Axboe

pipe: adjust minimum pipe size to 1 page

2010-06-03T10:44:30+00:00

We don't need to pages to guarantee the POSIX requirement
that upto a page size write must be atomic to an empty
pipe.

Signed-off-by: Jens Axboe