[CIFS] Change semaphore to mutex for cifs lock_sem

Originally at http://lkml.org/lkml/2006/9/2/86

The recent change to "allow Windows blocking locks to be cancelled via a
CANCEL_LOCK call" introduced a new semaphore in struct cifsFileInfo,
lock_sem.  However, semaphores used as mutexes are deprecated these days,
and there's no reason to add a new one to the kernel.  Therefore, convert
lock_sem to a struct mutex (and also fix one indentation glitch on one of
the lines changed anyway).

Signed-off-by: Roland Dreier <roland@digitalvampire.org>
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 9 insertions, 9 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e4de8eba4780..23655de2f4a4 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -311,7 +311,7 @@ struct cifsFileInfo {
         /* lock scope id (0 if none) */
         struct file * pfile; /* needed for writepage */
         struct inode * pInode; /* needed for oplock break */
-        struct semaphore lock_sem;
+        struct mutex lock_mutex;
         struct list_head llist; /* list of byte range locks we have. */
         unsigned closePend:1;   /* file is marked to close */
         unsigned invalidHandle:1;  /* file closed via session abend */
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 3fad638d26d3..e5210519ac4b 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -274,7 +274,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                         pCifsFile->invalidHandle = FALSE;
                         pCifsFile->closePend     = FALSE;
                         init_MUTEX(&pCifsFile->fh_sem);
-                        init_MUTEX(&pCifsFile->lock_sem);
+                        mutex_init(&pCifsFile->lock_mutex);
                         INIT_LIST_HEAD(&pCifsFile->llist);
                         atomic_set(&pCifsFile->wrtPending,0);
 
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 467cf89c039f..b570530f97bf 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -48,7 +48,7 @@ static inline struct cifsFileInfo *cifs_init_private(
         private_data->netfid = netfid;
         private_data->pid = current->tgid;      
         init_MUTEX(&private_data->fh_sem);
-        init_MUTEX(&private_data->lock_sem);
+        mutex_init(&private_data->lock_mutex);
         INIT_LIST_HEAD(&private_data->llist);
         private_data->pfile = file; /* needed for writepage */
         private_data->pInode = inode;
@@ -511,12 +511,12 @@ int cifs_close(struct inode *inode, struct file *file)
 
                 /* Delete any outstanding lock records.
                    We'll lose them when the file is closed anyway. */
-                down(&pSMBFile->lock_sem);
+                mutex_lock(&pSMBFile->lock_mutex);
                 list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) {
                         list_del(&li->llist);
                         kfree(li);
                 }
-                up(&pSMBFile->lock_sem);
+                mutex_unlock(&pSMBFile->lock_mutex);
 
                 write_lock(&GlobalSMBSeslock);
                 list_del(&pSMBFile->flist);
@@ -601,9 +601,9 @@ static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
         li->offset = offset;
         li->length = len;
         li->type = lockType;
-        down(&fid->lock_sem);
+        mutex_lock(&fid->lock_mutex);
         list_add(&li->llist, &fid->llist);
-        up(&fid->lock_sem);
+        mutex_unlock(&fid->lock_mutex);
         return 0;
 }
 
@@ -760,7 +760,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
                         struct cifsLockInfo *li, *tmp;
 
                         rc = 0;
-                        down(&fid->lock_sem);
+                        mutex_lock(&fid->lock_mutex);
                         list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
                                 if (pfLock->fl_start <= li->offset &&
                                                 length >= li->length) {
@@ -774,7 +774,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
                                         kfree(li);
                                 }
                         }
-                        up(&fid->lock_sem);
+                        mutex_unlock(&fid->lock_mutex);
                 }
         }