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pipe: refactor argument for account_pipe_buffers() 

commit 3734a13b96ebf039b293d8d37a934fd1bd9e03ab upstream.

This is a preparatory patch for following work. account_pipe_buffers()
performs accounting in the 'user_struct'. There is no need to pass a
pointer to a 'pipe_inode_info' struct (which is then dereferenced to
obtain a pointer to the 'user' field). Instead, pass a pointer directly
to the 'user_struct'. This change is needed in preparation for a
subsequent patch that the fixes the limit checking in alloc_pipe_info()
(and the resulting code is a little more logical).

Link: http://lkml.kernel.org/r/7277bf8c-a6fc-4a7d-659c-f5b145c981ab@gmail.com
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reviewed-by: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: <socketpair@gmail.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Jens Axboe <axboe@fb.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Michael Kerrisk (man-pages) 2016-10-11 13:53:28 -07:00 committed by syphyr
parent 45a24d1e64
commit 0dda4baf2a
1 changed files with 5 additions and 5 deletions
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10
fs/pipe.c
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@ -800,10 +800,10 @@ pipe_fasync(int fd, struct file *filp, int on)
return retval;
}
static void account_pipe_buffers(struct pipe_inode_info *pipe,
static void account_pipe_buffers(struct user_struct *user,
unsigned long old, unsigned long new)
{
atomic_long_add(new - old, &pipe->user->pipe_bufs);
atomic_long_add(new - old, &user->pipe_bufs);
}
static bool too_many_pipe_buffers_soft(struct user_struct *user)
@ -838,7 +838,7 @@ struct pipe_inode_info *alloc_pipe_info(void)
pipe->r_counter = pipe->w_counter = 1;
pipe->buffers = pipe_bufs;
pipe->user = user;
account_pipe_buffers(pipe, 0, pipe_bufs);
account_pipe_buffers(user, 0, pipe_bufs);
mutex_init(&pipe->mutex);
return pipe;
}
@ -853,7 +853,7 @@ void free_pipe_info(struct pipe_inode_info *pipe)
{
int i;
account_pipe_buffers(pipe, pipe->buffers, 0);
account_pipe_buffers(pipe->user, pipe->buffers, 0);
free_uid(pipe->user);
for (i = 0; i < pipe->buffers; i++) {
struct pipe_buffer *buf = pipe->bufs + i;
@ -1272,7 +1272,7 @@ static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg)
memcpy(bufs + head, pipe->bufs, tail * sizeof(struct pipe_buffer));
}
account_pipe_buffers(pipe, pipe->buffers, nr_pages);
account_pipe_buffers(pipe->user, pipe->buffers, nr_pages);
pipe->curbuf = 0;
kfree(pipe->bufs);
pipe->bufs = bufs;