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Subject[PATCH v2 3/8] pipe: refactor argument for account_pipe_buffers()
Date
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).

Cc: Willy Tarreau <w@1wt.eu>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
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>
Cc: linux-api@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
fs/pipe.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 4b98fd0..37b7f5e 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -604,10 +604,10 @@ 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)
@@ -644,7 +644,7 @@ 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;
}
@@ -659,7 +659,7 @@ 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;
@@ -1080,7 +1080,7 @@ 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;
--
2.5.5
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