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fs/pipe: move check to pipe_has_watch_queue()

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This declutters the code by reducing the number of #ifdefs and makes
the watch_queue checks simpler.  This has no runtime effect; the
machine code is identical.

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Message-Id: <20230921075755.1378787-2-max.kellermann@ionos.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Max Kellermann 2023-09-21 09:57:53 +02:00 committed by Christian Brauner
parent 61105aab4e
commit b4bd6b4bac
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 19 additions and 9 deletions
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12
fs/pipe.c
View File

@ -437,12 +437,10 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
goto out;
}
#ifdef CONFIG_WATCH_QUEUE
if (pipe->watch_queue) {
if (pipe_has_watch_queue(pipe)) {
ret = -EXDEV;
goto out;
}
#endif
/*
* If it wasn't empty we try to merge new data into
@ -1325,10 +1323,8 @@ static long pipe_set_size(struct pipe_inode_info *pipe, unsigned int arg)
unsigned int nr_slots, size;
long ret = 0;
#ifdef CONFIG_WATCH_QUEUE
if (pipe->watch_queue)
if (pipe_has_watch_queue(pipe))
return -EBUSY;
#endif
size = round_pipe_size(arg);
nr_slots = size >> PAGE_SHIFT;
@ -1380,10 +1376,8 @@ struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice)
if (file->f_op != &pipefifo_fops || !pipe)
return NULL;
#ifdef CONFIG_WATCH_QUEUE
if (for_splice && pipe->watch_queue)
if (for_splice && pipe_has_watch_queue(pipe))
return NULL;
#endif
return pipe;
}

16
include/linux/pipe_fs_i.h
View File

@ -124,6 +124,22 @@ struct pipe_buf_operations {
bool (*get)(struct pipe_inode_info *, struct pipe_buffer *);
};
/**
* pipe_has_watch_queue - Check whether the pipe is a watch_queue,
* i.e. it was created with O_NOTIFICATION_PIPE
* @pipe: The pipe to check
*
* Return: true if pipe is a watch queue, false otherwise.
*/
static inline bool pipe_has_watch_queue(const struct pipe_inode_info *pipe)
{
#ifdef CONFIG_WATCH_QUEUE
return pipe->watch_queue != NULL;
#else
return false;
#endif
}
/**
* pipe_empty - Return true if the pipe is empty
* @head: The pipe ring head pointer