[CIFS]
Allow Windows blocking locks to be cancelled via a
CANCEL_LOCK call. TODO - restrict this to servers
that support NT_STATUS codes (Win9x will probably
not support this call).
Signed-off-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
(cherry picked from 570d4d2d895569825d0d017d4e76b51138f68864 commit)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 52e2e4c..e9c5ba9 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -5,6 +5,7 @@
*
* Copyright (C) International Business Machines Corp., 2002,2003
* Author(s): Steve French (sfrench@us.ibm.com)
+ * Jeremy Allison (jra@samba.org)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
@@ -47,6 +48,8 @@
private_data->netfid = netfid;
private_data->pid = current->tgid;
init_MUTEX(&private_data->fh_sem);
+ init_MUTEX(&private_data->lock_sem);
+ INIT_LIST_HEAD(&private_data->llist);
private_data->pfile = file; /* needed for writepage */
private_data->pInode = inode;
private_data->invalidHandle = FALSE;
@@ -473,6 +476,8 @@
cifs_sb = CIFS_SB(inode->i_sb);
pTcon = cifs_sb->tcon;
if (pSMBFile) {
+ struct cifsLockInfo *li, *tmp;
+
pSMBFile->closePend = TRUE;
if (pTcon) {
/* no sense reconnecting to close a file that is
@@ -496,6 +501,16 @@
pSMBFile->netfid);
}
}
+
+ /* Delete any outstanding lock records.
+ We'll lose them when the file is closed anyway. */
+ down(&pSMBFile->lock_sem);
+ list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) {
+ list_del(&li->llist);
+ kfree(li);
+ }
+ up(&pSMBFile->lock_sem);
+
write_lock(&GlobalSMBSeslock);
list_del(&pSMBFile->flist);
list_del(&pSMBFile->tlist);
@@ -570,6 +585,21 @@
return rc;
}
+static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
+ __u64 offset, __u8 lockType)
+{
+ struct cifsLockInfo *li = kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
+ if (li == NULL)
+ return -ENOMEM;
+ li->offset = offset;
+ li->length = len;
+ li->type = lockType;
+ down(&fid->lock_sem);
+ list_add(&li->llist, &fid->llist);
+ up(&fid->lock_sem);
+ return 0;
+}
+
int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
{
int rc, xid;
@@ -581,6 +611,7 @@
struct cifsTconInfo *pTcon;
__u16 netfid;
__u8 lockType = LOCKING_ANDX_LARGE_FILES;
+ int posix_locking;
length = 1 + pfLock->fl_end - pfLock->fl_start;
rc = -EACCES;
@@ -639,14 +670,14 @@
}
netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
+ posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability));
/* BB add code here to normalize offset and length to
account for negative length which we can not accept over the
wire */
if (IS_GETLK(cmd)) {
- if((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
- (CIFS_UNIX_FCNTL_CAP &
- le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {
+ if(posix_locking) {
int posix_lock_type;
if(lockType & LOCKING_ANDX_SHARED_LOCK)
posix_lock_type = CIFS_RDLCK;
@@ -682,9 +713,15 @@
FreeXid(xid);
return rc;
}
- if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
- (CIFS_UNIX_FCNTL_CAP &
- le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {
+
+ if (!numLock && !numUnlock) {
+ /* if no lock or unlock then nothing
+ to do since we do not know what it is */
+ FreeXid(xid);
+ return -EOPNOTSUPP;
+ }
+
+ if (posix_locking) {
int posix_lock_type;
if(lockType & LOCKING_ANDX_SHARED_LOCK)
posix_lock_type = CIFS_RDLCK;
@@ -693,18 +730,46 @@
if(numUnlock == 1)
posix_lock_type = CIFS_UNLCK;
- else if(numLock == 0) {
- /* if no lock or unlock then nothing
- to do since we do not know what it is */
- FreeXid(xid);
- return -EOPNOTSUPP;
- }
+
rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
length, pfLock,
posix_lock_type, wait_flag);
- } else
- rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
- numUnlock, numLock, lockType, wait_flag);
+ } else {
+ struct cifsFileInfo *fid = (struct cifsFileInfo *)file->private_data;
+
+ if (numLock) {
+ rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
+ 0, numLock, lockType, wait_flag);
+
+ if (rc == 0) {
+ /* For Windows locks we must store them. */
+ rc = store_file_lock(fid, length,
+ pfLock->fl_start, lockType);
+ }
+ } else if (numUnlock) {
+ /* For each stored lock that this unlock overlaps
+ completely, unlock it. */
+ int stored_rc = 0;
+ struct cifsLockInfo *li, *tmp;
+
+ down(&fid->lock_sem);
+ list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
+ if (pfLock->fl_start <= li->offset &&
+ length >= li->length) {
+ stored_rc = CIFSSMBLock(xid, pTcon, netfid,
+ li->length, li->offset,
+ 1, 0, li->type, FALSE);
+ if (stored_rc)
+ rc = stored_rc;
+
+ list_del(&li->llist);
+ kfree(li);
+ }
+ }
+ up(&fid->lock_sem);
+ }
+ }
+
if (pfLock->fl_flags & FL_POSIX)
posix_lock_file_wait(file, pfLock);
FreeXid(xid);