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@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>
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09b4d19900
45
fs/pipe.c
45
fs/pipe.c
@ -622,33 +622,34 @@ static bool too_many_pipe_buffers_hard(struct user_struct *user)
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struct pipe_inode_info *alloc_pipe_info(void)
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{
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struct pipe_inode_info *pipe;
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unsigned long pipe_bufs = PIPE_DEF_BUFFERS;
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struct user_struct *user = get_current_user();
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pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL_ACCOUNT);
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if (pipe) {
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unsigned long pipe_bufs = PIPE_DEF_BUFFERS;
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struct user_struct *user = get_current_user();
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if (pipe == NULL)
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goto out_free_uid;
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if (!too_many_pipe_buffers_hard(user)) {
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if (too_many_pipe_buffers_soft(user))
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pipe_bufs = 1;
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pipe->bufs = kcalloc(pipe_bufs,
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sizeof(struct pipe_buffer),
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GFP_KERNEL_ACCOUNT);
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}
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if (pipe->bufs) {
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init_waitqueue_head(&pipe->wait);
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pipe->r_counter = pipe->w_counter = 1;
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pipe->buffers = pipe_bufs;
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pipe->user = user;
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account_pipe_buffers(user, 0, pipe_bufs);
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mutex_init(&pipe->mutex);
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return pipe;
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}
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free_uid(user);
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kfree(pipe);
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if (!too_many_pipe_buffers_hard(user)) {
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if (too_many_pipe_buffers_soft(user))
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pipe_bufs = 1;
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pipe->bufs = kcalloc(pipe_bufs,
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sizeof(struct pipe_buffer),
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GFP_KERNEL_ACCOUNT);
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}
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if (pipe->bufs) {
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init_waitqueue_head(&pipe->wait);
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pipe->r_counter = pipe->w_counter = 1;
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pipe->buffers = pipe_bufs;
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pipe->user = user;
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account_pipe_buffers(user, 0, pipe_bufs);
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mutex_init(&pipe->mutex);
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return pipe;
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}
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kfree(pipe);
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out_free_uid:
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free_uid(user);
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return NULL;
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}
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