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File locking related changes for v3.18 (pile #1)

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Merge tag 'locks-v3.18-1' of git://git.samba.org/jlayton/linux

Pull file locking related changes from Jeff Layton:
 "This release is a little more busy for file locking changes than the
  last:

   - a set of patches from Kinglong Mee to fix the lockowner handling in
     knfsd
   - a pile of cleanups to the internal file lease API.  This should get
     us a bit closer to allowing for setlease methods that can block.

  There are some dependencies between mine and Bruce's trees this cycle,
  and I based my tree on top of the requisite patches in Bruce's tree"

* tag 'locks-v3.18-1' of git://git.samba.org/jlayton/linux: (26 commits)
  locks: fix fcntl_setlease/getlease return when !CONFIG_FILE_LOCKING
  locks: flock_make_lock should return a struct file_lock (or PTR_ERR)
  locks: set fl_owner for leases to filp instead of current->files
  locks: give lm_break a return value
  locks: __break_lease cleanup in preparation of allowing direct removal of leases
  locks: remove i_have_this_lease check from __break_lease
  locks: move freeing of leases outside of i_lock
  locks: move i_lock acquisition into generic_*_lease handlers
  locks: define a lm_setup handler for leases
  locks: plumb a "priv" pointer into the setlease routines
  nfsd: don't keep a pointer to the lease in nfs4_file
  locks: clean up vfs_setlease kerneldoc comments
  locks: generic_delete_lease doesn't need a file_lock at all
  nfsd: fix potential lease memory leak in nfs4_setlease
  locks: close potential race in lease_get_mtime
  security: make security_file_set_fowner, f_setown and __f_setown void return
  locks: consolidate "nolease" routines
  locks: remove lock_may_read and lock_may_write
  lockd: rip out deferred lock handling from testlock codepath
  NFSD: Get reference of lockowner when coping file_lock
  ...
This commit is contained in:
Linus Torvalds 2014-10-11 13:21:34 -04:00
commit ef4a48c513
26 changed files with 354 additions and 488 deletions
Download patch file Download diff file Expand all files Collapse all files

68
fs/lockd/svclock.c
View file

@ -245,7 +245,6 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host,
block->b_daemon = rqstp->rq_server;
block->b_host = host;
block->b_file = file;
block->b_fl = NULL;
file->f_count++;
/* Add to file's list of blocks */
@ -295,7 +294,6 @@ static void nlmsvc_free_block(struct kref *kref)
nlmsvc_freegrantargs(block->b_call);
nlmsvc_release_call(block->b_call);
nlm_release_file(block->b_file);
kfree(block->b_fl);
kfree(block);
}
@ -508,7 +506,6 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
struct nlm_host *host, struct nlm_lock *lock,
struct nlm_lock *conflock, struct nlm_cookie *cookie)
{
struct nlm_block *block = NULL;
int error;
__be32 ret;
@ -519,63 +516,26 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
/* Get existing block (in case client is busy-waiting) */
block = nlmsvc_lookup_block(file, lock);
if (block == NULL) {
struct file_lock *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
if (conf == NULL)
return nlm_granted;
block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
if (block == NULL) {
kfree(conf);
return nlm_granted;
}
block->b_fl = conf;
}
if (block->b_flags & B_QUEUED) {
dprintk("lockd: nlmsvc_testlock deferred block %p flags %d fl %p\n",
block, block->b_flags, block->b_fl);
if (block->b_flags & B_TIMED_OUT) {
nlmsvc_unlink_block(block);
ret = nlm_lck_denied;
goto out;
}
if (block->b_flags & B_GOT_CALLBACK) {
nlmsvc_unlink_block(block);
if (block->b_fl != NULL
&& block->b_fl->fl_type != F_UNLCK) {
lock->fl = *block->b_fl;
goto conf_lock;
} else {
ret = nlm_granted;
goto out;
}
}
ret = nlm_drop_reply;
goto out;
}
if (locks_in_grace(SVC_NET(rqstp))) {
ret = nlm_lck_denied_grace_period;
goto out;
}
error = vfs_test_lock(file->f_file, &lock->fl);
if (error == FILE_LOCK_DEFERRED) {
ret = nlmsvc_defer_lock_rqst(rqstp, block);
goto out;
}
if (error) {
/* We can't currently deal with deferred test requests */
if (error == FILE_LOCK_DEFERRED)
WARN_ON_ONCE(1);
ret = nlm_lck_denied_nolocks;
goto out;
}
if (lock->fl.fl_type == F_UNLCK) {
ret = nlm_granted;
goto out;
}
conf_lock:
dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
lock->fl.fl_type, (long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
@ -586,10 +546,9 @@ conf_lock:
conflock->fl.fl_type = lock->fl.fl_type;
conflock->fl.fl_start = lock->fl.fl_start;
conflock->fl.fl_end = lock->fl.fl_end;
locks_release_private(&lock->fl);
ret = nlm_lck_denied;
out:
if (block)
nlmsvc_release_block(block);
return ret;
}
@ -660,29 +619,22 @@ nlmsvc_cancel_blocked(struct net *net, struct nlm_file *file, struct nlm_lock *l
* This is a callback from the filesystem for VFS file lock requests.
* It will be used if lm_grant is defined and the filesystem can not
* respond to the request immediately.
* For GETLK request it will copy the reply to the nlm_block.
* For SETLK or SETLKW request it will get the local posix lock.
* In all cases it will move the block to the head of nlm_blocked q where
* nlmsvc_retry_blocked() can send back a reply for SETLKW or revisit the
* deferred rpc for GETLK and SETLK.
*/
static void
nlmsvc_update_deferred_block(struct nlm_block *block, struct file_lock *conf,
int result)
nlmsvc_update_deferred_block(struct nlm_block *block, int result)
{
block->b_flags |= B_GOT_CALLBACK;
if (result == 0)
block->b_granted = 1;
else
block->b_flags |= B_TIMED_OUT;
if (conf) {
if (block->b_fl)
__locks_copy_lock(block->b_fl, conf);
}
}
static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf,
int result)
static int nlmsvc_grant_deferred(struct file_lock *fl, int result)
{
struct nlm_block *block;
int rc = -ENOENT;
@ -697,7 +649,7 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf,
rc = -ENOLCK;
break;
}
nlmsvc_update_deferred_block(block, conf, result);
nlmsvc_update_deferred_block(block, result);
} else if (result == 0)
block->b_granted = 1;