The patch titled
locks: allow {vfs,posix}_lock_file to return conflicting lock
has been added to the -mm tree. Its filename is
locks-allow-vfsposix_lock_file-to-return-conflicting-lock.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: locks: allow {vfs,posix}_lock_file to return conflicting lock
From: Marc Eshel <eshel@xxxxxxxxxxxxxxx> - unquoted
The nfsv4 protocol's lock operation, in the case of a conflict, returns
information about the conflicting lock.
It's unclear how clients can use this, so for now we're not going so far as to
add a filesystem method that can return a conflicting lock, but we may as well
return something in the local case when it's easy to.
Signed-off-by: "J. Bruce Fields" <bfields@xxxxxxxxxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxx>
Cc: Marc Eshel <eshel@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/lockd/svclock.c | 6 +++---
fs/lockd/svcsubs.c | 2 +-
fs/locks.c | 38 +++++++++++++-------------------------
fs/nfsd/nfs4state.c | 10 ++++++----
include/linux/fs.h | 5 ++---
5 files changed, 25 insertions(+), 36 deletions(-)
diff -puN fs/lockd/svclock.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock fs/lockd/svclock.c
--- a/fs/lockd/svclock.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock
+++ a/fs/lockd/svclock.c
@@ -362,7 +362,7 @@ again:
} else
lock = &block->b_call->a_args.lock;
- error = posix_lock_file(file->f_file, &lock->fl);
+ error = posix_lock_file(file->f_file, &lock->fl, NULL);
lock->fl.fl_flags &= ~FL_SLEEP;
dprintk("lockd: posix_lock_file returned %d\n", error);
@@ -466,7 +466,7 @@ nlmsvc_unlock(struct nlm_file *file, str
nlmsvc_cancel_blocked(file, lock);
lock->fl.fl_type = F_UNLCK;
- error = posix_lock_file(file->f_file, &lock->fl);
+ error = posix_lock_file(file->f_file, &lock->fl, NULL);
return (error < 0)? nlm_lck_denied_nolocks : nlm_granted;
}
@@ -568,7 +568,7 @@ nlmsvc_grant_blocked(struct nlm_block *b
/* Try the lock operation again */
lock->fl.fl_flags |= FL_SLEEP;
- error = posix_lock_file(file->f_file, &lock->fl);
+ error = posix_lock_file(file->f_file, &lock->fl, NULL);
lock->fl.fl_flags &= ~FL_SLEEP;
switch (error) {
diff -puN fs/lockd/svcsubs.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock fs/lockd/svcsubs.c
--- a/fs/lockd/svcsubs.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock
+++ a/fs/lockd/svcsubs.c
@@ -182,7 +182,7 @@ again:
lock.fl_type = F_UNLCK;
lock.fl_start = 0;
lock.fl_end = OFFSET_MAX;
- if (posix_lock_file(file->f_file, &lock) < 0) {
+ if (posix_lock_file(file->f_file, &lock, NULL) < 0) {
printk("lockd: unlock failure in %s:%d\n",
__FILE__, __LINE__);
return 1;
diff -puN fs/locks.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock fs/locks.c
--- a/fs/locks.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock
+++ a/fs/locks.c
@@ -801,7 +801,7 @@ out:
return error;
}
-static int __posix_lock_file_conf(struct inode *inode, struct file_lock *request, struct file_lock *conflock)
+static int __posix_lock_file(struct inode *inode, struct file_lock *request, struct file_lock *conflock)
{
struct file_lock *fl;
struct file_lock *new_fl = NULL;
@@ -1007,6 +1007,7 @@ static int __posix_lock_file_conf(struct
* posix_lock_file - Apply a POSIX-style lock to a file
* @filp: The file to apply the lock to
* @fl: The lock to be applied
+ * @conflock: Place to return a copy of the conflicting lock, if found.
*
* Add a POSIX style lock to a file.
* We merge adjacent & overlapping locks whenever possible.
@@ -1016,26 +1017,12 @@ static int __posix_lock_file_conf(struct
* whether or not a lock was successfully freed by testing the return
* value for -ENOENT.
*/
-int posix_lock_file(struct file *filp, struct file_lock *fl)
-{
- return __posix_lock_file_conf(filp->f_path.dentry->d_inode, fl, NULL);
-}
-EXPORT_SYMBOL(posix_lock_file);
-
-/**
- * posix_lock_file_conf - Apply a POSIX-style lock to a file
- * @filp: The file to apply the lock to
- * @fl: The lock to be applied
- * @conflock: Place to return a copy of the conflicting lock, if found.
- *
- * Except for the conflock parameter, acts just like posix_lock_file.
- */
-int posix_lock_file_conf(struct file *filp, struct file_lock *fl,
+int posix_lock_file(struct file *filp, struct file_lock *fl,
struct file_lock *conflock)
{
- return __posix_lock_file_conf(filp->f_path.dentry->d_inode, fl, conflock);
+ return __posix_lock_file(filp->f_path.dentry->d_inode, fl, conflock);
}
-EXPORT_SYMBOL(posix_lock_file_conf);
+EXPORT_SYMBOL(posix_lock_file);
/**
* posix_lock_file_wait - Apply a POSIX-style lock to a file
@@ -1051,7 +1038,7 @@ int posix_lock_file_wait(struct file *fi
int error;
might_sleep ();
for (;;) {
- error = posix_lock_file(filp, fl);
+ error = posix_lock_file(filp, fl, NULL);
if ((error != -EAGAIN) || !(fl->fl_flags & FL_SLEEP))
break;
error = wait_event_interruptible(fl->fl_wait, !fl->fl_next);
@@ -1123,7 +1110,7 @@ int locks_mandatory_area(int read_write,
fl.fl_end = offset + count - 1;
for (;;) {
- error = __posix_lock_file_conf(inode, &fl, NULL);
+ error = __posix_lock_file(inode, &fl, NULL);
if (error != -EAGAIN)
break;
if (!(fl.fl_flags & FL_SLEEP))
@@ -1704,13 +1691,14 @@ out:
* @filp: The file to apply the lock to
* @cmd: type of locking operation (F_SETLK, F_GETLK, etc.)
* @fl: The lock to be applied
+ * @conf: Place to return a copy of the conflicting lock, if found.
*/
-int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl)
+int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl, struct file_lock *conf)
{
if (filp->f_op && filp->f_op->lock)
return filp->f_op->lock(filp, cmd, fl);
else
- return posix_lock_file(filp, fl);
+ return posix_lock_file(filp, fl, conf);
}
EXPORT_SYMBOL_GPL(vfs_lock_file);
@@ -1777,7 +1765,7 @@ again:
goto out;
for (;;) {
- error = vfs_lock_file(filp, cmd, file_lock);
+ error = vfs_lock_file(filp, cmd, file_lock, NULL);
if (error != -EAGAIN || cmd == F_SETLK)
break;
error = wait_event_interruptible(file_lock->fl_wait,
@@ -1903,7 +1891,7 @@ again:
goto out;
for (;;) {
- error = vfs_lock_file(filp, cmd, file_lock);
+ error = vfs_lock_file(filp, cmd, file_lock, NULL);
if (error != -EAGAIN || cmd == F_SETLK64)
break;
error = wait_event_interruptible(file_lock->fl_wait,
@@ -1957,7 +1945,7 @@ void locks_remove_posix(struct file *fil
lock.fl_ops = NULL;
lock.fl_lmops = NULL;
- vfs_lock_file(filp, F_SETLK, &lock);
+ vfs_lock_file(filp, F_SETLK, &lock, NULL);
if (lock.fl_ops && lock.fl_ops->fl_release_private)
lock.fl_ops->fl_release_private(&lock);
diff -puN fs/nfsd/nfs4state.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock fs/nfsd/nfs4state.c
--- a/fs/nfsd/nfs4state.c~locks-allow-vfsposix_lock_file-to-return-conflicting-lock
+++ a/fs/nfsd/nfs4state.c
@@ -2657,6 +2657,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struc
struct file_lock conflock;
__be32 status = 0;
unsigned int strhashval;
+ unsigned int cmd;
int err;
dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
@@ -2739,10 +2740,12 @@ nfsd4_lock(struct svc_rqst *rqstp, struc
case NFS4_READ_LT:
case NFS4_READW_LT:
file_lock.fl_type = F_RDLCK;
+ cmd = F_SETLK;
break;
case NFS4_WRITE_LT:
case NFS4_WRITEW_LT:
file_lock.fl_type = F_WRLCK;
+ cmd = F_SETLK;
break;
default:
status = nfserr_inval;
@@ -2769,9 +2772,8 @@ nfsd4_lock(struct svc_rqst *rqstp, struc
/* XXX?: Just to divert the locks_release_private at the start of
* locks_copy_lock: */
- conflock.fl_ops = NULL;
- conflock.fl_lmops = NULL;
- err = posix_lock_file_conf(filp, &file_lock, &conflock);
+ locks_init_lock(&conflock);
+ err = posix_lock_file(filp, &file_lock, &conflock);
switch (-err) {
case 0: /* success! */
update_stateid(&lock_stp->st_stateid);
@@ -2933,7 +2935,7 @@ nfsd4_locku(struct svc_rqst *rqstp, stru
/*
* Try to unlock the file in the VFS.
*/
- err = posix_lock_file(filp, &file_lock);
+ err = posix_lock_file(filp, &file_lock, NULL);
if (err) {
dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
goto out_nfserr;
diff -puN include/linux/fs.h~locks-allow-vfsposix_lock_file-to-return-conflicting-lock include/linux/fs.h
--- a/include/linux/fs.h~locks-allow-vfsposix_lock_file-to-return-conflicting-lock
+++ a/include/linux/fs.h
@@ -854,12 +854,11 @@ extern void locks_copy_lock(struct file_
extern void locks_remove_posix(struct file *, fl_owner_t);
extern void locks_remove_flock(struct file *);
extern int posix_test_lock(struct file *, struct file_lock *);
-extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *);
-extern int posix_lock_file(struct file *, struct file_lock *);
+extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
extern int posix_lock_file_wait(struct file *, struct file_lock *);
extern int posix_unblock_lock(struct file *, struct file_lock *);
extern int vfs_test_lock(struct file *, struct file_lock *);
-extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *);
+extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
extern int __break_lease(struct inode *inode, unsigned int flags);
extern void lease_get_mtime(struct inode *, struct timespec *time);
_
Patches currently in -mm which might be from eshel@xxxxxxxxxxxxxxx are
locks-trivial-removal-of-unnecessary-parentheses.patch
locks-create-posix-to-flock-helper-functions.patch
locks-make-lock-release-private-data-before-returning-in-getlk-case.patch
locks-give-posix_test_lock-same-interface-as-lock.patch
locks-factor-out-generic-filesystem-switch-from-test_lock.patch
locks-factor-out-generic-filesystem-switch-from-setlock-code.patch
locks-allow-vfsposix_lock_file-to-return-conflicting-lock.patch
locks-add-fl_notify-arguments-for-asynchronous-lock-return.patch
locks-add-lock-cancel-command.patch
nfsd4-convert-nfsv4-to-new-lock-interface.patch
lockd-save-lock-state-on-deferral.patch
lockd-handle-fl_notify-callbacks.patch
lockd-pass-cookie-in-nlmsvc_testlock.patch
lockd-handle-test_lock-deferrals.patch
lockd-always-preallocate-block-in-nlmsvc_lock.patch
lockd-add-code-to-handle-deferred-lock-requests.patch
gfs2-nfs-lock-support-for-gfs2.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
