Merge tag 'locks-v4.1-1' of git://git.samba.org/jlayton/linux
Pull file locking related changes from Jeff Layton:
"This set is mostly minor cleanups to the overhaul that went in last
cycle. The other noticeable items are the changes to the lm_get_owner
and lm_put_owner prototypes, and the fact that we no longer need to
use the i_lock to protect the i_flctx pointer"
* tag 'locks-v4.1-1' of git://git.samba.org/jlayton/linux:
locks: use cmpxchg to assign i_flctx pointer
locks: get rid of WE_CAN_BREAK_LSLK_NOW dead code
locks: change lm_get_owner and lm_put_owner prototypes
locks: don't allocate a lock context for an F_UNLCK request
locks: Add lockdep assertion for blocked_lock_lock
locks: remove extraneous IS_POSIX and IS_FLOCK tests
locks: Remove unnecessary IS_POSIX test
diff --git a/fs/locks.c b/fs/locks.c
index 40bc384..52b780f 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -203,11 +203,11 @@
static struct kmem_cache *filelock_cache __read_mostly;
static struct file_lock_context *
-locks_get_lock_context(struct inode *inode)
+locks_get_lock_context(struct inode *inode, int type)
{
struct file_lock_context *new;
- if (likely(inode->i_flctx))
+ if (likely(inode->i_flctx) || type == F_UNLCK)
goto out;
new = kmem_cache_alloc(flctx_cache, GFP_KERNEL);
@@ -223,14 +223,7 @@
* Assign the pointer if it's not already assigned. If it is, then
* free the context we just allocated.
*/
- spin_lock(&inode->i_lock);
- if (likely(!inode->i_flctx)) {
- inode->i_flctx = new;
- new = NULL;
- }
- spin_unlock(&inode->i_lock);
-
- if (new)
+ if (cmpxchg(&inode->i_flctx, NULL, new))
kmem_cache_free(flctx_cache, new);
out:
return inode->i_flctx;
@@ -276,8 +269,10 @@
}
if (fl->fl_lmops) {
- if (fl->fl_lmops->lm_put_owner)
- fl->fl_lmops->lm_put_owner(fl);
+ if (fl->fl_lmops->lm_put_owner) {
+ fl->fl_lmops->lm_put_owner(fl->fl_owner);
+ fl->fl_owner = NULL;
+ }
fl->fl_lmops = NULL;
}
}
@@ -333,7 +328,7 @@
if (fl->fl_lmops) {
if (fl->fl_lmops->lm_get_owner)
- fl->fl_lmops->lm_get_owner(new, fl);
+ fl->fl_lmops->lm_get_owner(fl->fl_owner);
}
}
EXPORT_SYMBOL(locks_copy_conflock);
@@ -592,11 +587,15 @@
static void locks_insert_global_blocked(struct file_lock *waiter)
{
+ lockdep_assert_held(&blocked_lock_lock);
+
hash_add(blocked_hash, &waiter->fl_link, posix_owner_key(waiter));
}
static void locks_delete_global_blocked(struct file_lock *waiter)
{
+ lockdep_assert_held(&blocked_lock_lock);
+
hash_del(&waiter->fl_link);
}
@@ -730,7 +729,7 @@
/* POSIX locks owned by the same process do not conflict with
* each other.
*/
- if (!IS_POSIX(sys_fl) || posix_same_owner(caller_fl, sys_fl))
+ if (posix_same_owner(caller_fl, sys_fl))
return (0);
/* Check whether they overlap */
@@ -748,7 +747,7 @@
/* FLOCK locks referring to the same filp do not conflict with
* each other.
*/
- if (!IS_FLOCK(sys_fl) || (caller_fl->fl_file == sys_fl->fl_file))
+ if (caller_fl->fl_file == sys_fl->fl_file)
return (0);
if ((caller_fl->fl_type & LOCK_MAND) || (sys_fl->fl_type & LOCK_MAND))
return 0;
@@ -838,6 +837,8 @@
{
int i = 0;
+ lockdep_assert_held(&blocked_lock_lock);
+
/*
* This deadlock detector can't reasonably detect deadlocks with
* FL_OFDLCK locks, since they aren't owned by a process, per-se.
@@ -871,9 +872,12 @@
bool found = false;
LIST_HEAD(dispose);
- ctx = locks_get_lock_context(inode);
- if (!ctx)
- return -ENOMEM;
+ ctx = locks_get_lock_context(inode, request->fl_type);
+ if (!ctx) {
+ if (request->fl_type != F_UNLCK)
+ return -ENOMEM;
+ return (request->fl_flags & FL_EXISTS) ? -ENOENT : 0;
+ }
if (!(request->fl_flags & FL_ACCESS) && (request->fl_type != F_UNLCK)) {
new_fl = locks_alloc_lock();
@@ -939,9 +943,9 @@
bool added = false;
LIST_HEAD(dispose);
- ctx = locks_get_lock_context(inode);
+ ctx = locks_get_lock_context(inode, request->fl_type);
if (!ctx)
- return -ENOMEM;
+ return (request->fl_type == F_UNLCK) ? 0 : -ENOMEM;
/*
* We may need two file_lock structures for this operation,
@@ -964,8 +968,6 @@
*/
if (request->fl_type != F_UNLCK) {
list_for_each_entry(fl, &ctx->flc_posix, fl_list) {
- if (!IS_POSIX(fl))
- continue;
if (!posix_locks_conflict(request, fl))
continue;
if (conflock)
@@ -1605,7 +1607,8 @@
lease = *flp;
trace_generic_add_lease(inode, lease);
- ctx = locks_get_lock_context(inode);
+ /* Note that arg is never F_UNLCK here */
+ ctx = locks_get_lock_context(inode, arg);
if (!ctx)
return -ENOMEM;
@@ -2555,15 +2558,10 @@
: (fl->fl_type == F_WRLCK) ? "WRITE" : "READ ");
}
if (inode) {
-#ifdef WE_CAN_BREAK_LSLK_NOW
- seq_printf(f, "%d %s:%ld ", fl_pid,
- inode->i_sb->s_id, inode->i_ino);
-#else
- /* userspace relies on this representation of dev_t ;-( */
+ /* userspace relies on this representation of dev_t */
seq_printf(f, "%d %02x:%02x:%ld ", fl_pid,
MAJOR(inode->i_sb->s_dev),
MINOR(inode->i_sb->s_dev), inode->i_ino);
-#endif
} else {
seq_printf(f, "%d <none>:0 ", fl_pid);
}
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 8ba1d88..326a545 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4932,20 +4932,22 @@
lock->fl_end = OFFSET_MAX;
}
-static void nfsd4_fl_get_owner(struct file_lock *dst, struct file_lock *src)
+static fl_owner_t
+nfsd4_fl_get_owner(fl_owner_t owner)
{
- struct nfs4_lockowner *lo = (struct nfs4_lockowner *)src->fl_owner;
- dst->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lo->lo_owner));
+ struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
+
+ nfs4_get_stateowner(&lo->lo_owner);
+ return owner;
}
-static void nfsd4_fl_put_owner(struct file_lock *fl)
+static void
+nfsd4_fl_put_owner(fl_owner_t owner)
{
- struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
+ struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
- if (lo) {
+ if (lo)
nfs4_put_stateowner(&lo->lo_owner);
- fl->fl_owner = NULL;
- }
}
static const struct lock_manager_operations nfsd_posix_mng_ops = {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4d9acc9..90a1207 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -915,8 +915,8 @@
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 *);
+ fl_owner_t (*lm_get_owner)(fl_owner_t);
+ void (*lm_put_owner)(fl_owner_t);
void (*lm_notify)(struct file_lock *); /* unblock callback */
int (*lm_grant)(struct file_lock *, int);
bool (*lm_break)(struct file_lock *);