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authorKinglong Mee <kinglongmee@gmail.com>2014-08-22 18:18:43 +0400
committerJeff Layton <jlayton@primarydata.com>2014-09-10 00:01:09 +0400
commitf328296e27414394f25cebaef4a111a82ce0df32 (patch)
tree2263381bcef86e21e5d20dbfdd72c1f248382daa /fs/locks.c
parent5c97d7b1479982a48cf2129062b880c2555049ac (diff)
downloadlinux-f328296e27414394f25cebaef4a111a82ce0df32.tar.xz
locks: Copy fl_lmops information for conflock in locks_copy_conflock()
Commit d5b9026a67 ([PATCH] knfsd: locks: flag NFSv4-owned locks) using fl_lmops field in file_lock for checking nfsd4 lockowner. But, commit 1a747ee0cc (locks: don't call ->copy_lock methods on return of conflicting locks) causes the fl_lmops of conflock always be NULL. Also, commit 0996905f93 (lockd: posix_test_lock() should not call locks_copy_lock()) caused the fl_lmops of conflock always be NULL too. Make sure copy the private information by fl_copy_lock() in struct file_lock_operations, merge __locks_copy_lock() to fl_copy_lock(). Jeff advice, "Set fl_lmops on conflocks, but don't set fl_ops. fl_ops are superfluous, since they are callbacks into the filesystem. There should be no need to bother the filesystem at all with info in a conflock. But, lock _ownership_ matters for conflocks and that's indicated by the fl_lmops. So you really do want to copy the fl_lmops for conflocks I think." v5: add missing calling of locks_release_private() in nlmsvc_testlock() v4: only copy fl_lmops for conflock, don't copy fl_ops Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c36
1 files changed, 16 insertions, 20 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 5e83f3a99377..c3991dc80137 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -271,21 +271,6 @@ void locks_init_lock(struct file_lock *fl)
EXPORT_SYMBOL(locks_init_lock);
-static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
-{
- if (fl->fl_ops) {
- if (fl->fl_ops->fl_copy_lock)
- fl->fl_ops->fl_copy_lock(new, fl);
- new->fl_ops = fl->fl_ops;
- }
-
- 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;
- }
-}
-
/*
* Initialize a new lock from an existing file_lock structure.
*/
@@ -298,8 +283,13 @@ void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
new->fl_type = fl->fl_type;
new->fl_start = fl->fl_start;
new->fl_end = fl->fl_end;
+ new->fl_lmops = fl->fl_lmops;
new->fl_ops = NULL;
- new->fl_lmops = NULL;
+
+ if (fl->fl_lmops) {
+ if (fl->fl_lmops->lm_get_owner)
+ fl->fl_lmops->lm_get_owner(new, fl);
+ }
}
EXPORT_SYMBOL(locks_copy_conflock);
@@ -309,11 +299,14 @@ void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
WARN_ON_ONCE(new->fl_ops);
locks_copy_conflock(new, fl);
+
new->fl_file = fl->fl_file;
new->fl_ops = fl->fl_ops;
- new->fl_lmops = fl->fl_lmops;
- locks_copy_private(new, fl);
+ if (fl->fl_ops) {
+ if (fl->fl_ops->fl_copy_lock)
+ fl->fl_ops->fl_copy_lock(new, fl);
+ }
}
EXPORT_SYMBOL(locks_copy_lock);
@@ -1989,11 +1982,13 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
if (file_lock.fl_type != F_UNLCK) {
error = posix_lock_to_flock(&flock, &file_lock);
if (error)
- goto out;
+ goto rel_priv;
}
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;
+rel_priv:
+ locks_release_private(&file_lock);
out:
return error;
}
@@ -2214,7 +2209,8 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;
-
+
+ locks_release_private(&file_lock);
out:
return error;
}