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@xxxxxxxxxxxxxxx>
Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
---
fs/locks.c | 12 ++++++++++--
include/linux/fs.h | 2 ++
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index 49ce390..c376561 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -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;
+ }
}
/*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 5ab86f4..3b07ce2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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 *);
--
1.9.3
--
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