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pipe: simplify logic in alloc_pipe_info()

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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/[email protected]
Signed-off-by: Michael Kerrisk <[email protected]>
Reviewed-by: Vegard Nossum <[email protected]>
Cc: Willy Tarreau <[email protected]>
Cc: <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michael Kerrisk (man-pages) 2016-10-11 13:53:34 -07:00 • committed by Linus Torvalds
commit 09b4d19900
1 changed files with 23 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

45
fs/pipe.c
View file

@ -622,33 +622,34 @@ static bool too_many_pipe_buffers_hard(struct user_struct *user)
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 (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 (!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;
}
kfree(pipe);
out_free_uid:
free_uid(user);
return NULL;
}