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[CIFS] Change semaphore to mutex for cifs lock_sem

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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>
This commit is contained in:
Roland Dreier 2007-05-03 04:33:45 +00:00 committed by Steve French
parent 0b2365f826
commit 796e5661f6
3 changed files with 9 additions and 9 deletions
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2
fs/cifs/cifsglob.h
View File

@ -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 */

2
fs/cifs/dir.c
View File

@ -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);

14
fs/cifs/file.c
View File

@ -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);
}
}