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File locking related fixes for v3.20 (pile #2)

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Merge tag 'locks-v3.20-2' of git://git.samba.org/jlayton/linux

Pull file locking fixes from Jeff Layton:
 "A small set of patches to fix problems with the recent file locking
  changes that we discussed earlier this week"
"

* tag 'locks-v3.20-2' of git://git.samba.org/jlayton/linux:
  locks: fix list insertion when lock is split in two
  locks: remove conditional lock release in middle of flock_lock_file
  locks: only remove leases associated with the file being closed
  Revert "locks: keep a count of locks on the flctx lists"
This commit is contained in:
Linus Torvalds 2015-02-18 10:21:47 -08:00
commit b2b89ebfc0
4 changed files with 36 additions and 49 deletions
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9
fs/ceph/locks.c
View File

@ -245,6 +245,7 @@ int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
*/
void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
{
struct file_lock *lock;
struct file_lock_context *ctx;
*fcntl_count = 0;
@ -252,8 +253,12 @@ void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
ctx = inode->i_flctx;
if (ctx) {
*fcntl_count = ctx->flc_posix_cnt;
*flock_count = ctx->flc_flock_cnt;
spin_lock(&ctx->flc_lock);
list_for_each_entry(lock, &ctx->flc_posix, fl_list)
++(*fcntl_count);
list_for_each_entry(lock, &ctx->flc_flock, fl_list)
++(*flock_count);
spin_unlock(&ctx->flc_lock);
}
dout("counted %d flock locks and %d fcntl locks",
*flock_count, *fcntl_count);

14
fs/cifs/file.c
View File

@ -1129,7 +1129,7 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct file_lock *flock;
struct file_lock_context *flctx = inode->i_flctx;
unsigned int i;
unsigned int count = 0, i;
int rc = 0, xid, type;
struct list_head locks_to_send, *el;
struct lock_to_push *lck, *tmp;
@ -1140,14 +1140,20 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
if (!flctx)
goto out;
spin_lock(&flctx->flc_lock);
list_for_each(el, &flctx->flc_posix) {
count++;
}
spin_unlock(&flctx->flc_lock);
INIT_LIST_HEAD(&locks_to_send);
/*
* Allocating flc_posix_cnt locks is enough because no FL_POSIX locks
* can be added to the list while we are holding cinode->lock_sem that
* Allocating count locks is enough because no FL_POSIX locks can be
* added to the list while we are holding cinode->lock_sem that
* protects locking operations of this inode.
*/
for (i = 0; i < flctx->flc_posix_cnt; i++) {
for (i = 0; i < count; i++) {
lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
if (!lck) {
rc = -ENOMEM;

59
fs/locks.c
View File

@ -681,21 +681,18 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
}
static void
locks_insert_lock_ctx(struct file_lock *fl, int *counter,
struct list_head *before)
locks_insert_lock_ctx(struct file_lock *fl, struct list_head *before)
{
fl->fl_nspid = get_pid(task_tgid(current));
list_add_tail(&fl->fl_list, before);
++*counter;
locks_insert_global_locks(fl);
}
static void
locks_unlink_lock_ctx(struct file_lock *fl, int *counter)
locks_unlink_lock_ctx(struct file_lock *fl)
{
locks_delete_global_locks(fl);
list_del_init(&fl->fl_list);
--*counter;
if (fl->fl_nspid) {
put_pid(fl->fl_nspid);
fl->fl_nspid = NULL;
@ -704,10 +701,9 @@ locks_unlink_lock_ctx(struct file_lock *fl, int *counter)
}
static void
locks_delete_lock_ctx(struct file_lock *fl, int *counter,
struct list_head *dispose)
locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose)
{
locks_unlink_lock_ctx(fl, counter);
locks_unlink_lock_ctx(fl);
if (dispose)
list_add(&fl->fl_list, dispose);
else
@ -895,7 +891,7 @@ static int flock_lock_file(struct file *filp, struct file_lock *request)
if (request->fl_type == fl->fl_type)
goto out;
found = true;
locks_delete_lock_ctx(fl, &ctx->flc_flock_cnt, &dispose);
locks_delete_lock_ctx(fl, &dispose);
break;
}
@ -905,16 +901,6 @@ static int flock_lock_file(struct file *filp, struct file_lock *request)
goto out;
}
/*
* If a higher-priority process was blocked on the old file lock,
* give it the opportunity to lock the file.
*/
if (found) {
spin_unlock(&ctx->flc_lock);
cond_resched();
spin_lock(&ctx->flc_lock);
}
find_conflict:
list_for_each_entry(fl, &ctx->flc_flock, fl_list) {
if (!flock_locks_conflict(request, fl))
@ -929,7 +915,7 @@ find_conflict:
if (request->fl_flags & FL_ACCESS)
goto out;
locks_copy_lock(new_fl, request);
locks_insert_lock_ctx(new_fl, &ctx->flc_flock_cnt, &ctx->flc_flock);
locks_insert_lock_ctx(new_fl, &ctx->flc_flock);
new_fl = NULL;
error = 0;
@ -1046,8 +1032,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
else
request->fl_end = fl->fl_end;
if (added) {
locks_delete_lock_ctx(fl, &ctx->flc_posix_cnt,
&dispose);
locks_delete_lock_ctx(fl, &dispose);
continue;
}
request = fl;
@ -1076,8 +1061,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
* one (This may happen several times).
*/
if (added) {
locks_delete_lock_ctx(fl,
&ctx->flc_posix_cnt, &dispose);
locks_delete_lock_ctx(fl, &dispose);
continue;
}
/*
@ -1093,10 +1077,8 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
locks_copy_lock(new_fl, request);
request = new_fl;
new_fl = NULL;
locks_insert_lock_ctx(request,
&ctx->flc_posix_cnt, &fl->fl_list);
locks_delete_lock_ctx(fl,
&ctx->flc_posix_cnt, &dispose);
locks_insert_lock_ctx(request, &fl->fl_list);
locks_delete_lock_ctx(fl, &dispose);
added = true;
}
}
@ -1124,8 +1106,8 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
goto out;
}
locks_copy_lock(new_fl, request);
locks_insert_lock_ctx(new_fl, &ctx->flc_posix_cnt,
&fl->fl_list);
locks_insert_lock_ctx(new_fl, &fl->fl_list);
fl = new_fl;
new_fl = NULL;
}
if (right) {
@ -1136,8 +1118,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
left = new_fl2;
new_fl2 = NULL;
locks_copy_lock(left, right);
locks_insert_lock_ctx(left, &ctx->flc_posix_cnt,
&fl->fl_list);
locks_insert_lock_ctx(left, &fl->fl_list);
}
right->fl_start = request->fl_end + 1;
locks_wake_up_blocks(right);
@ -1321,7 +1302,6 @@ static void lease_clear_pending(struct file_lock *fl, int arg)
/* We already had a lease on this file; just change its type */
int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
{
struct file_lock_context *flctx;
int error = assign_type(fl, arg);
if (error)
@ -1331,7 +1311,6 @@ int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
if (arg == F_UNLCK) {
struct file *filp = fl->fl_file;
flctx = file_inode(filp)->i_flctx;
f_delown(filp);
filp->f_owner.signum = 0;
fasync_helper(0, fl->fl_file, 0, &fl->fl_fasync);
@ -1339,7 +1318,7 @@ int lease_modify(struct file_lock *fl, int arg, struct list_head *dispose)
printk(KERN_ERR "locks_delete_lock: fasync == %p\n", fl->fl_fasync);
fl->fl_fasync = NULL;
}
locks_delete_lock_ctx(fl, &flctx->flc_lease_cnt, dispose);
locks_delete_lock_ctx(fl, dispose);
}
return 0;
}
@ -1456,8 +1435,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
fl->fl_downgrade_time = break_time;
}
if (fl->fl_lmops->lm_break(fl))
locks_delete_lock_ctx(fl, &ctx->flc_lease_cnt,
&dispose);
locks_delete_lock_ctx(fl, &dispose);
}
if (list_empty(&ctx->flc_lease))
@ -1697,7 +1675,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
if (!leases_enable)
goto out;
locks_insert_lock_ctx(lease, &ctx->flc_lease_cnt, &ctx->flc_lease);
locks_insert_lock_ctx(lease, &ctx->flc_lease);
/*
* The check in break_lease() is lockless. It's possible for another
* open to race in after we did the earlier check for a conflicting
@ -1710,7 +1688,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
smp_mb();
error = check_conflicting_open(dentry, arg, lease->fl_flags);
if (error) {
locks_unlink_lock_ctx(lease, &ctx->flc_lease_cnt);
locks_unlink_lock_ctx(lease);
goto out;
}
@ -2448,7 +2426,8 @@ locks_remove_lease(struct file *filp)
spin_lock(&ctx->flc_lock);
list_for_each_entry_safe(fl, tmp, &ctx->flc_lease, fl_list)
lease_modify(fl, F_UNLCK, &dispose);
if (filp == fl->fl_file)
lease_modify(fl, F_UNLCK, &dispose);
spin_unlock(&ctx->flc_lock);
locks_dispose_list(&dispose);
}

3
include/linux/fs.h
View File

@ -968,9 +968,6 @@ struct file_lock_context {
struct list_head flc_flock;
struct list_head flc_posix;
struct list_head flc_lease;
int flc_flock_cnt;
int flc_posix_cnt;
int flc_lease_cnt;
};
/* The following constant reflects the upper bound of the file/locking space */