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fs/locks: rename some lists and pointers.

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struct file lock contains an 'fl_next' pointer which
is used to point to the lock that this request is blocked
waiting for.  So rename it to fl_blocker.

The fl_blocked list_head in an active lock is the head of a list of
blocked requests.  In a request it is a node in that list.
These are two distinct uses, so replace with two list_heads
with different names.
fl_blocked_requests is the head of a list of blocked requests
fl_blocked_member is a node in a member of that list.

The two different list_heads are never used at the same time, but that
will change in a future patch.

Note that a tracepoint is changed to report fl_blocker instead
of fl_next.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
NeilBrown 2018-11-30 10:04:08 +11:00 • committed by Jeff Layton
parent ccda4af0f4
commit ada5c1da86
4 changed files with 47 additions and 39 deletions
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9
include/linux/fs.h
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@ -1044,10 +1044,15 @@ bool opens_in_grace(struct net *);
* Obviously, the last two criteria only matter for POSIX locks.
*/
struct file_lock {
struct file_lock *fl_next; /* singly linked list for this inode */
struct file_lock *fl_blocker; /* The lock, that is blocking us */
struct list_head fl_list; /* link into file_lock_context */
struct hlist_node fl_link; /* node in global lists */
struct list_head fl_block; /* circular list of blocked processes */
struct list_head fl_blocked_requests; /* list of requests with
* ->fl_blocker pointing here
*/
struct list_head fl_blocked_member; /* node in
* ->fl_blocker->fl_blocked_requests
*/
fl_owner_t fl_owner;
unsigned int fl_flags;
unsigned char fl_type;