[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>

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e4de8eb..23655de 100644 (file)
--- 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 3fad638..e521051 100644 (file)
--- 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 467cf89..b570530 100644 (file)
--- 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);
                }
        }