The patch titled
Subject: pipe: simplify logic in alloc_pipe_info()
has been added to the -mm tree. Its filename is
pipe-simplify-logic-in-alloc_pipe_info.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/pipe-simplify-logic-in-alloc_pipe_info.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/pipe-simplify-logic-in-alloc_pipe_info.patch
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------------------------------------------------------
From: "Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx>
Subject: pipe: simplify logic in alloc_pipe_info()
Replace an 'if' block that covers most of the code in this function
with a 'goto'. This makes the code a little simpler to read, and also
simplifies the next patch (fix limit checking in alloc_pipe_info())
Link: http://lkml.kernel.org/r/aef030c1-0257-98a9-4988-186efa48530c@xxxxxxxxx
Signed-off-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Willy Tarreau <w@xxxxxx>
Cc: Vegard Nossum <vegard.nossum@xxxxxxxxxx>
Cc: <socketpair@xxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/pipe.c | 43 ++++++++++++++++++++++---------------------
1 file changed, 22 insertions(+), 21 deletions(-)
diff -puN fs/pipe.c~pipe-simplify-logic-in-alloc_pipe_info fs/pipe.c
--- a/fs/pipe.c~pipe-simplify-logic-in-alloc_pipe_info
+++ a/fs/pipe.c
@@ -625,33 +625,34 @@ static bool too_many_pipe_buffers_hard(s
struct pipe_inode_info *alloc_pipe_info(void)
{
struct pipe_inode_info *pipe;
+ unsigned long pipe_bufs = PIPE_DEF_BUFFERS;
+ struct user_struct *user = get_current_user();
pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL_ACCOUNT);
- if (pipe) {
- unsigned long pipe_bufs = PIPE_DEF_BUFFERS;
- struct user_struct *user = get_current_user();
+ if (pipe == NULL)
+ goto out_free_uid;
- if (!too_many_pipe_buffers_hard(user)) {
- if (too_many_pipe_buffers_soft(user))
- pipe_bufs = 1;
- pipe->bufs = kcalloc(pipe_bufs,
- sizeof(struct pipe_buffer),
- GFP_KERNEL_ACCOUNT);
- }
+ if (!too_many_pipe_buffers_hard(user)) {
+ if (too_many_pipe_buffers_soft(user))
+ pipe_bufs = 1;
+ pipe->bufs = kcalloc(pipe_bufs,
+ sizeof(struct pipe_buffer),
+ GFP_KERNEL_ACCOUNT);
+ }
- if (pipe->bufs) {
- init_waitqueue_head(&pipe->wait);
- pipe->r_counter = pipe->w_counter = 1;
- pipe->buffers = pipe_bufs;
- pipe->user = user;
- account_pipe_buffers(user, 0, pipe_bufs);
- mutex_init(&pipe->mutex);
- return pipe;
- }
- free_uid(user);
- kfree(pipe);
+ if (pipe->bufs) {
+ init_waitqueue_head(&pipe->wait);
+ pipe->r_counter = pipe->w_counter = 1;
+ pipe->buffers = pipe_bufs;
+ pipe->user = user;
+ account_pipe_buffers(user, 0, pipe_bufs);
+ mutex_init(&pipe->mutex);
+ return pipe;
}
+ kfree(pipe);
+out_free_uid:
+ free_uid(user);
return NULL;
}
_
Patches currently in -mm which might be from mtk.manpages@xxxxxxxxx are
pipe-relocate-round_pipe_size-above-pipe_set_size.patch
pipe-move-limit-checking-logic-into-pipe_set_size.patch
pipe-refactor-argument-for-account_pipe_buffers.patch
pipe-fix-limit-checking-in-pipe_set_size.patch
pipe-simplify-logic-in-alloc_pipe_info.patch
pipe-fix-limit-checking-in-alloc_pipe_info.patch
pipe-make-account_pipe_buffers-return-a-value-and-use-it.patch
pipe-cap-initial-pipe-capacity-according-to-pipe-max-size-limit.patch
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