linux/fs/cachefiles
Ingo Molnar 2055da9738 sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming
So I've noticed a number of instances where it was not obvious from the
code whether ->task_list was for a wait-queue head or a wait-queue entry.

Furthermore, there's a number of wait-queue users where the lists are
not for 'tasks' but other entities (poll tables, etc.), in which case
the 'task_list' name is actively confusing.

To clear this all up, name the wait-queue head and entry list structure
fields unambiguously:

	struct wait_queue_head::task_list	=> ::head
	struct wait_queue_entry::task_list	=> ::entry

For example, this code:

	rqw->wait.task_list.next != &wait->task_list

... is was pretty unclear (to me) what it's doing, while now it's written this way:

	rqw->wait.head.next != &wait->entry

... which makes it pretty clear that we are iterating a list until we see the head.

Other examples are:

	list_for_each_entry_safe(pos, next, &x->task_list, task_list) {
	list_for_each_entry(wq, &fence->wait.task_list, task_list) {

... where it's unclear (to me) what we are iterating, and during review it's
hard to tell whether it's trying to walk a wait-queue entry (which would be
a bug), while now it's written as:

	list_for_each_entry_safe(pos, next, &x->head, entry) {
	list_for_each_entry(wq, &fence->wait.head, entry) {

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-06-20 12:19:14 +02:00
..
Kconfig CacheFiles: A cache that backs onto a mounted filesystem 2009-04-03 16:42:41 +01:00
Makefile CacheFiles: A cache that backs onto a mounted filesystem 2009-04-03 16:42:41 +01:00
bind.c xattr: Add __vfs_{get,set,remove}xattr helpers 2016-10-07 20:10:44 -04:00
daemon.c CacheFiles: Provide read-and-reset release counters for cachefilesd 2016-02-01 12:30:10 -05:00
interface.c cachefiles: Fix attempt to read i_blocks after deleting file [ver #2] 2016-09-27 18:31:29 -04:00
internal.h sched/wait: Split out the wait_bit*() APIs from <linux/wait.h> into <linux/wait_bit.h> 2017-06-20 12:19:09 +02:00
key.c CacheFiles: Downgrade the requirements passed to the allocator 2012-12-20 21:58:25 +00:00
main.c fs/cachefiles: add missing \n to kerror conversions 2014-09-26 08:10:35 -07:00
namei.c sched/wait: Rename wait_queue_t => wait_queue_entry_t 2017-06-20 12:18:27 +02:00
proc.c drop redundant ->owner initializations 2016-05-29 19:08:00 -04:00
rdwr.c sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming 2017-06-20 12:19:14 +02:00
security.c VFS: fs/cachefiles: d_backing_inode() annotations 2015-04-15 15:06:59 -04:00
xattr.c VFS: fs/cachefiles: d_backing_inode() annotations 2015-04-15 15:06:59 -04:00