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locks: New ops in lock_manager_operations for get/put owner 

NFSD or other lockmanager may increase the owner's reference,
so adds two new options for copying and releasing owner.

v5: change order from 2/6 to 3/6
v4: rename lm_copy_owner/lm_release_owner to lm_get_owner/lm_put_owner

Reviewed-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
hifive-unleashed-5.1
Kinglong Mee 2014-08-22 10:18:43 -04:00 committed by Jeff Layton
parent 3fe0fff18f
commit 5c97d7b147
2 changed files with 12 additions and 2 deletions
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12
fs/locks.c
View File

@ -230,8 +230,12 @@ void locks_release_private(struct file_lock *fl)
fl->fl_ops->fl_release_private(fl);
fl->fl_ops = NULL;
}
fl->fl_lmops = NULL;
if (fl->fl_lmops) {
if (fl->fl_lmops->lm_put_owner)
fl->fl_lmops->lm_put_owner(fl);
fl->fl_lmops = NULL;
}
}
EXPORT_SYMBOL_GPL(locks_release_private);
@ -274,8 +278,12 @@ static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
fl->fl_ops->fl_copy_lock(new, fl);
new->fl_ops = fl->fl_ops;
}
if (fl->fl_lmops)
if (fl->fl_lmops) {
if (fl->fl_lmops->lm_get_owner)
fl->fl_lmops->lm_get_owner(new, fl);
new->fl_lmops = fl->fl_lmops;
}
}
/*

2
include/linux/fs.h
View File

@ -868,6 +868,8 @@ struct file_lock_operations {
struct lock_manager_operations {
int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
unsigned long (*lm_owner_key)(struct file_lock *);
void (*lm_get_owner)(struct file_lock *, struct file_lock *);
void (*lm_put_owner)(struct file_lock *);
void (*lm_notify)(struct file_lock *); /* unblock callback */
int (*lm_grant)(struct file_lock *, int);
void (*lm_break)(struct file_lock *);