Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  cifs: handle the TCP_Server_Info->tsk field more carefully
  cifs: fix unlinking of rename target when server doesn't support open file renames
  [CIFS] improve setlease handling
  [CIFS] fix saving of resume key before CIFSFindNext
  cifs: make cifs_rename handle -EACCES errors
  [CIFS] fix build error
  [CIFS] undo changes in cifs_rename_pending_delete if it errors out
  cifs: track DeletePending flag in cifsInodeInfo
  cifs: don't use CREATE_DELETE_ON_CLOSE in cifs_rename_pending_delete
  [CIFS] eliminate usage of kthread_stop for cifsd
  [CIFS] Add nodfs mount option

fs/cifs/CHANGES

@@ -1,3 +1,11 @@
+Version 1.55
+------------
+Various fixes to make delete of open files behavior more predictable
+(when delete of an open file fails we mark the file as "delete-on-close"
+in a way that more servers accept, but only if we can first rename the
+file to a temporary name).  Add experimental support for more safely
+handling fcntl(F_SETLEASE).
+
 Version 1.54
 ------------
 Fix premature write failure on congested networks (we would give up
@@ -13,6 +21,7 @@ on dns_upcall (resolving DFS referralls).  Fix plain text password
 authentication (requires setting SecurityFlags to 0x30030 to enable
 lanman and plain text though).  Fix writes to be at correct offset when
 file is open with O_APPEND and file is on a directio (forcediretio) mount.
+Fix bug in rewinding readdir directory searches.  Add nodfs mount option.
 
 Version 1.53
 ------------

fs/cifs/README

@@ -463,6 +463,9 @@ A partial list of the supported mount options follows:
 		with cifs style mandatory byte range locks (and most
 		cifs servers do not yet support requesting advisory
 		byte range locks).
+ nodfs          Disable DFS (global name space support) even if the
+		server claims to support it.  This can help work around
+		a problem with parsing of DFS paths with Samba 3.0.24 server.
  remount        remount the share (often used to change from ro to rw mounts
 	        or vice versa)
  cifsacl        Report mode bits (e.g. on stat) based on the Windows ACL for
@@ -488,6 +491,19 @@ A partial list of the supported mount options follows:
 		Note that this differs from the sign mount option in that it
 		causes encryption of data sent over this mounted share but other
 		shares mounted to the same server are unaffected.
+ locallease     This option is rarely needed. Fcntl F_SETLEASE is
+		used by some applications such as Samba and NFSv4 server to
+		check to see whether a file is cacheable.  CIFS has no way
+		to explicitly request a lease, but can check whether a file
+		is cacheable (oplocked).  Unfortunately, even if a file
+		is not oplocked, it could still be cacheable (ie cifs client
+		could grant fcntl leases if no other local processes are using
+		the file) for cases for example such as when the server does not
+		support oplocks and the user is sure that the only updates to
+		the file will be from this client. Specifying this mount option
+		will allow the cifs client to check for leases (only) locally
+		for files which are not oplocked instead of denying leases
+		in that case. (EXPERIMENTAL)
  sec            Security mode.  Allowed values are:
 			none	attempt to connection as a null user (no name)
 			krb5    Use Kerberos version 5 authentication
@@ -638,6 +654,9 @@ requires enabling CONFIG_CIFS_EXPERIMENTAL
 	cifsacl support needed to retrieve approximated mode bits based on
 		the contents on the CIFS ACL.
 
+	lease support: cifs will check the oplock state before calling into
+	the vfs to see if we can grant a lease on a file.
+
 	DNOTIFY fcntl: needed for support of directory change 
 			    notification and perhaps later for file leases)
 

fs/cifs/cifsfs.c

@@ -312,6 +312,7 @@ cifs_alloc_inode(struct super_block *sb)
 	file data or metadata */
 	cifs_inode->clientCanCacheRead = false;
 	cifs_inode->clientCanCacheAll = false;
+	cifs_inode->delete_pending = false;
 	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 
 	/* Can not set i_flags here - they get immediately overwritten
@@ -620,6 +621,37 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 	return generic_file_llseek_unlocked(file, offset, origin);
 }
 
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
+{
+	/* note that this is called by vfs setlease with the BKL held
+	   although I doubt that BKL is needed here in cifs */
+	struct inode *inode = file->f_path.dentry->d_inode;
+
+	if (!(S_ISREG(inode->i_mode)))
+		return -EINVAL;
+
+	/* check if file is oplocked */
+	if (((arg == F_RDLCK) &&
+		(CIFS_I(inode)->clientCanCacheRead)) ||
+	    ((arg == F_WRLCK) &&
+		(CIFS_I(inode)->clientCanCacheAll)))
+		return generic_setlease(file, arg, lease);
+	else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
+			!CIFS_I(inode)->clientCanCacheRead)
+		/* If the server claims to support oplock on this
+		   file, then we still need to check oplock even
+		   if the local_lease mount option is set, but there
+		   are servers which do not support oplock for which
+		   this mount option may be useful if the user
+		   knows that the file won't be changed on the server
+		   by anyone else */
+		return generic_setlease(file, arg, lease);
+	else
+		return -EAGAIN;
+}
+#endif
+
 struct file_system_type cifs_fs_type = {
 	.owner = THIS_MODULE,
 	.name = "cifs",
@@ -698,6 +730,7 @@ const struct file_operations cifs_file_ops = {
 
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 	.dir_notify = cifs_dir_notify,
+	.setlease = cifs_setlease,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
@@ -718,6 +751,7 @@ const struct file_operations cifs_file_direct_ops = {
 	.llseek = cifs_llseek,
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 	.dir_notify = cifs_dir_notify,
+	.setlease = cifs_setlease,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 const struct file_operations cifs_file_nobrl_ops = {
@@ -738,6 +772,7 @@ const struct file_operations cifs_file_nobrl_ops = {
 
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 	.dir_notify = cifs_dir_notify,
+	.setlease = cifs_setlease,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
@@ -757,6 +792,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
 	.llseek = cifs_llseek,
 #ifdef CONFIG_CIFS_EXPERIMENTAL
 	.dir_notify = cifs_dir_notify,
+	.setlease = cifs_setlease,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
@@ -949,6 +985,12 @@ static int cifs_oplock_thread(void *dummyarg)
 				the call */
 			/* mutex_lock(&inode->i_mutex);*/
 			if (S_ISREG(inode->i_mode)) {
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+				if (CIFS_I(inode)->clientCanCacheAll == 0)
+					break_lease(inode, FMODE_READ);
+				else if (CIFS_I(inode)->clientCanCacheRead == 0)
+					break_lease(inode, FMODE_WRITE);
+#endif
 				rc = filemap_fdatawrite(inode->i_mapping);
 				if (CIFS_I(inode)->clientCanCacheRead == 0) {
 					waitrc = filemap_fdatawait(

fs/cifs/cifsfs.h

@@ -101,5 +101,5 @@ extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
 extern const struct export_operations cifs_export_ops;
 #endif /* EXPERIMENTAL */
 
-#define CIFS_VERSION   "1.54"
+#define CIFS_VERSION   "1.55"
 #endif				/* _CIFSFS_H */

fs/cifs/cifsglob.h

@@ -285,6 +285,7 @@ struct cifsTconInfo {
 	bool seal:1;      /* transport encryption for this mounted share */
 	bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 				for this mount even if server would support */
+	bool local_lease:1; /* check leases (only) on local system not remote */
 	/* BB add field for back pointer to sb struct(s)? */
 };
 
@@ -353,6 +354,7 @@ struct cifsInodeInfo {
 	bool clientCanCacheRead:1;	/* read oplock */
 	bool clientCanCacheAll:1;	/* read and writebehind oplock */
 	bool oplockPending:1;
+	bool delete_pending:1;		/* DELETE_ON_CLOSE is set */
 	struct inode vfs_inode;
 };
 

fs/cifs/cifssmb.c

@@ -1309,6 +1309,7 @@ SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
 				cpu_to_le64(le32_to_cpu(pSMBr->EndOfFile));
 			pfile_info->EndOfFile = pfile_info->AllocationSize;
 			pfile_info->NumberOfLinks = cpu_to_le32(1);
+			pfile_info->DeletePending = 0;
 		}
 	}
 
@@ -1410,6 +1411,7 @@ CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
 		    pfile_info->AllocationSize = pSMBr->AllocationSize;
 		    pfile_info->EndOfFile = pSMBr->EndOfFile;
 		    pfile_info->NumberOfLinks = cpu_to_le32(1);
+		    pfile_info->DeletePending = 0;
 		}
 	}