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

1 files changed, 42 insertions, 0 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 84cc011a16e4..ac5915d61dca 100644
--- a/fs/cifs/cifsfs.c
+++ b/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(