[PATCH] sem2mutex: quota

Semaphore to mutex conversion.

The conversion was generated via scripts, and the result was validated
automatically via a script as well.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Jan Kara <jack@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/dquot.c

@@ -103,12 +103,12 @@
  * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
  * for altering the flag i_mutex is also needed).  If operation is holding
  * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
- * dqonoff_sem.
+ * dqonoff_mutex.
  * This locking assures that:
  *   a) update/access to dquot pointers in inode is serialized
  *   b) everyone is guarded against invalidate_dquots()
  *
- * Each dquot has its dq_lock semaphore. Locked dquots might not be referenced
+ * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
  * from inodes (dquot_alloc_space() and such don't check the dq_lock).
  * Currently dquot is locked only when it is being read to memory (or space for
  * it is being allocated) on the first dqget() and when it is being released on
@@ -118,8 +118,9 @@
  * spinlock to internal buffers before writing.
  *
  * Lock ordering (including related VFS locks) is the following:
- *  i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > dqio_sem
- * i_mutex on quota files is special (it's below dqio_sem)
+ *   i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
+ *   dqio_mutex
+ * i_mutex on quota files is special (it's below dqio_mutex)
  */
 
 static DEFINE_SPINLOCK(dq_list_lock);
@@ -280,8 +281,8 @@ static inline void remove_inuse(struct dquot *dquot)
 
 static void wait_on_dquot(struct dquot *dquot)
 {
-	down(&dquot->dq_lock);
-	up(&dquot->dq_lock);
+	mutex_lock(&dquot->dq_lock);
+	mutex_unlock(&dquot->dq_lock);
 }
 
 #define mark_dquot_dirty(dquot) ((dquot)->dq_sb->dq_op->mark_dirty(dquot))
@@ -320,8 +321,8 @@ int dquot_acquire(struct dquot *dquot)
 	int ret = 0, ret2 = 0;
 	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
 
-	down(&dquot->dq_lock);
-	down(&dqopt->dqio_sem);
+	mutex_lock(&dquot->dq_lock);
+	mutex_lock(&dqopt->dqio_mutex);
 	if (!test_bit(DQ_READ_B, &dquot->dq_flags))
 		ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
 	if (ret < 0)
@@ -342,8 +343,8 @@ int dquot_acquire(struct dquot *dquot)
 	}
 	set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 out_iolock:
-	up(&dqopt->dqio_sem);
-	up(&dquot->dq_lock);
+	mutex_unlock(&dqopt->dqio_mutex);
+	mutex_unlock(&dquot->dq_lock);
 	return ret;
 }
 
@@ -355,7 +356,7 @@ int dquot_commit(struct dquot *dquot)
 	int ret = 0, ret2 = 0;
 	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
 
-	down(&dqopt->dqio_sem);
+	mutex_lock(&dqopt->dqio_mutex);
 	spin_lock(&dq_list_lock);
 	if (!clear_dquot_dirty(dquot)) {
 		spin_unlock(&dq_list_lock);
@@ -372,7 +373,7 @@ int dquot_commit(struct dquot *dquot)
 			ret = ret2;
 	}
 out_sem:
-	up(&dqopt->dqio_sem);
+	mutex_unlock(&dqopt->dqio_mutex);
 	return ret;
 }
 
@@ -384,11 +385,11 @@ int dquot_release(struct dquot *dquot)
 	int ret = 0, ret2 = 0;
 	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
 
-	down(&dquot->dq_lock);
+	mutex_lock(&dquot->dq_lock);
 	/* Check whether we are not racing with some other dqget() */
 	if (atomic_read(&dquot->dq_count) > 1)
 		goto out_dqlock;
-	down(&dqopt->dqio_sem);
+	mutex_lock(&dqopt->dqio_mutex);
 	if (dqopt->ops[dquot->dq_type]->release_dqblk) {
 		ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
 		/* Write the info */
@@ -398,9 +399,9 @@ int dquot_release(struct dquot *dquot)
 			ret = ret2;
 	}
 	clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
-	up(&dqopt->dqio_sem);
+	mutex_unlock(&dqopt->dqio_mutex);
 out_dqlock:
-	up(&dquot->dq_lock);
+	mutex_unlock(&dquot->dq_lock);
 	return ret;
 }
 
@@ -464,7 +465,7 @@ int vfs_quota_sync(struct super_block *sb, int type)
 	struct quota_info *dqopt = sb_dqopt(sb);
 	int cnt;
 
-	down(&dqopt->dqonoff_sem);
+	mutex_lock(&dqopt->dqonoff_mutex);
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		if (type != -1 && cnt != type)
 			continue;
@@ -499,7 +500,7 @@ int vfs_quota_sync(struct super_block *sb, int type)
 	spin_lock(&dq_list_lock);
 	dqstats.syncs++;
 	spin_unlock(&dq_list_lock);
-	up(&dqopt->dqonoff_sem);
+	mutex_unlock(&dqopt->dqonoff_mutex);
 
 	return 0;
 }
@@ -540,7 +541,7 @@ static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
 /*
  * Put reference to dquot
  * NOTE: If you change this function please check whether dqput_blocks() works right...
- * MUST be called with either dqptr_sem or dqonoff_sem held
+ * MUST be called with either dqptr_sem or dqonoff_mutex held
  */
 static void dqput(struct dquot *dquot)
 {
@@ -605,7 +606,7 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type)
 		return NODQUOT;
 
 	memset((caddr_t)dquot, 0, sizeof(struct dquot));
-	sema_init(&dquot->dq_lock, 1);
+	mutex_init(&dquot->dq_lock);
 	INIT_LIST_HEAD(&dquot->dq_free);
 	INIT_LIST_HEAD(&dquot->dq_inuse);
 	INIT_HLIST_NODE(&dquot->dq_hash);
@@ -620,7 +621,7 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type)
 
 /*
  * Get reference to dquot
- * MUST be called with either dqptr_sem or dqonoff_sem held
+ * MUST be called with either dqptr_sem or dqonoff_mutex held
  */
 static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
 {
@@ -686,7 +687,7 @@ static int dqinit_needed(struct inode *inode, int type)
 	return 0;
 }
 
-/* This routine is guarded by dqonoff_sem semaphore */
+/* This routine is guarded by dqonoff_mutex mutex */
 static void add_dquot_ref(struct super_block *sb, int type)
 {
 	struct list_head *p;
@@ -964,8 +965,8 @@ int dquot_initialize(struct inode *inode, int type)
 	unsigned int id = 0;
 	int cnt, ret = 0;
 
-	/* First test before acquiring semaphore - solves deadlocks when we
-         * re-enter the quota code and are already holding the semaphore */
+	/* First test before acquiring mutex - solves deadlocks when we
+         * re-enter the quota code and are already holding the mutex */
 	if (IS_NOQUOTA(inode))
 		return 0;
 	down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
@@ -1028,8 +1029,8 @@ int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
 	int cnt, ret = NO_QUOTA;
 	char warntype[MAXQUOTAS];
 
-	/* First test before acquiring semaphore - solves deadlocks when we
-         * re-enter the quota code and are already holding the semaphore */
+	/* First test before acquiring mutex - solves deadlocks when we
+         * re-enter the quota code and are already holding the mutex */
 	if (IS_NOQUOTA(inode)) {
 out_add:
 		inode_add_bytes(inode, number);
@@ -1077,8 +1078,8 @@ int dquot_alloc_inode(const struct inode *inode, unsigned long number)
 	int cnt, ret = NO_QUOTA;
 	char warntype[MAXQUOTAS];
 
-	/* First test before acquiring semaphore - solves deadlocks when we
-         * re-enter the quota code and are already holding the semaphore */
+	/* First test before acquiring mutex - solves deadlocks when we
+         * re-enter the quota code and are already holding the mutex */
 	if (IS_NOQUOTA(inode))
 		return QUOTA_OK;
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
@@ -1121,8 +1122,8 @@ int dquot_free_space(struct inode *inode, qsize_t number)
 {
 	unsigned int cnt;
 
-	/* First test before acquiring semaphore - solves deadlocks when we
-         * re-enter the quota code and are already holding the semaphore */
+	/* First test before acquiring mutex - solves deadlocks when we
+         * re-enter the quota code and are already holding the mutex */
 	if (IS_NOQUOTA(inode)) {
 out_sub:
 		inode_sub_bytes(inode, number);
@@ -1157,8 +1158,8 @@ int dquot_free_inode(const struct inode *inode, unsigned long number)
 {
 	unsigned int cnt;
 
-	/* First test before acquiring semaphore - solves deadlocks when we
-         * re-enter the quota code and are already holding the semaphore */
+	/* First test before acquiring mutex - solves deadlocks when we
+         * re-enter the quota code and are already holding the mutex */
 	if (IS_NOQUOTA(inode))
 		return QUOTA_OK;
 	down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
@@ -1197,8 +1198,8 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
 	    chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid;
 	char warntype[MAXQUOTAS];
 
-	/* First test before acquiring semaphore - solves deadlocks when we
-         * re-enter the quota code and are already holding the semaphore */
+	/* First test before acquiring mutex - solves deadlocks when we
+         * re-enter the quota code and are already holding the mutex */
 	if (IS_NOQUOTA(inode))
 		return QUOTA_OK;
 	/* Clear the arrays */
@@ -1292,9 +1293,9 @@ int dquot_commit_info(struct super_block *sb, int type)
 	int ret;
 	struct quota_info *dqopt = sb_dqopt(sb);
 
-	down(&dqopt->dqio_sem);
+	mutex_lock(&dqopt->dqio_mutex);
 	ret = dqopt->ops[type]->write_file_info(sb, type);
-	up(&dqopt->dqio_sem);
+	mutex_unlock(&dqopt->dqio_mutex);
 	return ret;
 }
 
@@ -1350,7 +1351,7 @@ int vfs_quota_off(struct super_block *sb, int type)
 	struct inode *toputinode[MAXQUOTAS];
 
 	/* We need to serialize quota_off() for device */
-	down(&dqopt->dqonoff_sem);
+	mutex_lock(&dqopt->dqonoff_mutex);
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		toputinode[cnt] = NULL;
 		if (type != -1 && cnt != type)
@@ -1379,7 +1380,7 @@ int vfs_quota_off(struct super_block *sb, int type)
 		dqopt->info[cnt].dqi_bgrace = 0;
 		dqopt->ops[cnt] = NULL;
 	}
-	up(&dqopt->dqonoff_sem);
+	mutex_unlock(&dqopt->dqonoff_mutex);
 	/* Sync the superblock so that buffers with quota data are written to
 	 * disk (and so userspace sees correct data afterwards). */
 	if (sb->s_op->sync_fs)
@@ -1392,7 +1393,7 @@ int vfs_quota_off(struct super_block *sb, int type)
 	 * changes done by userspace on the next quotaon() */
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 		if (toputinode[cnt]) {
-			down(&dqopt->dqonoff_sem);
+			mutex_lock(&dqopt->dqonoff_mutex);
 			/* If quota was reenabled in the meantime, we have
 			 * nothing to do */
 			if (!sb_has_quota_enabled(sb, cnt)) {
@@ -1404,7 +1405,7 @@ int vfs_quota_off(struct super_block *sb, int type)
 				mark_inode_dirty(toputinode[cnt]);
 				iput(toputinode[cnt]);
 			}
-			up(&dqopt->dqonoff_sem);
+			mutex_unlock(&dqopt->dqonoff_mutex);
 		}
 	if (sb->s_bdev)
 		invalidate_bdev(sb->s_bdev, 0);
@@ -1445,7 +1446,7 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
 	/* And now flush the block cache so that kernel sees the changes */
 	invalidate_bdev(sb->s_bdev, 0);
 	mutex_lock(&inode->i_mutex);
-	down(&dqopt->dqonoff_sem);
+	mutex_lock(&dqopt->dqonoff_mutex);
 	if (sb_has_quota_enabled(sb, type)) {
 		error = -EBUSY;
 		goto out_lock;
@@ -1470,17 +1471,17 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
 	dqopt->ops[type] = fmt->qf_ops;
 	dqopt->info[type].dqi_format = fmt;
 	INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
-	down(&dqopt->dqio_sem);
+	mutex_lock(&dqopt->dqio_mutex);
 	if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
-		up(&dqopt->dqio_sem);
+		mutex_unlock(&dqopt->dqio_mutex);
 		goto out_file_init;
 	}
-	up(&dqopt->dqio_sem);
+	mutex_unlock(&dqopt->dqio_mutex);
 	mutex_unlock(&inode->i_mutex);
 	set_enable_flags(dqopt, type);
 
 	add_dquot_ref(sb, type);
-	up(&dqopt->dqonoff_sem);
+	mutex_unlock(&dqopt->dqonoff_mutex);
 
 	return 0;
 
@@ -1488,7 +1489,7 @@ out_file_init:
 	dqopt->files[type] = NULL;
 	iput(inode);
 out_lock:
-	up(&dqopt->dqonoff_sem);
+	mutex_unlock(&dqopt->dqonoff_mutex);
 	if (oldflags != -1) {
 		down_write(&dqopt->dqptr_sem);
 		/* Set the flags back (in the case of accidental quotaon()
@@ -1576,14 +1577,14 @@ int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d
 {
 	struct dquot *dquot;
 
-	down(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 	if (!(dquot = dqget(sb, id, type))) {
-		up(&sb_dqopt(sb)->dqonoff_sem);
+		mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 		return -ESRCH;
 	}
 	do_get_dqblk(dquot, di);
 	dqput(dquot);
-	up(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return 0;
 }
 
@@ -1645,14 +1646,14 @@ int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d
 {
 	struct dquot *dquot;
 
-	down(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 	if (!(dquot = dqget(sb, id, type))) {
-		up(&sb_dqopt(sb)->dqonoff_sem);
+		mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 		return -ESRCH;
 	}
 	do_set_dqblk(dquot, di);
 	dqput(dquot);
-	up(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return 0;
 }
 
@@ -1661,9 +1662,9 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
 {
 	struct mem_dqinfo *mi;
   
-	down(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 	if (!sb_has_quota_enabled(sb, type)) {
-		up(&sb_dqopt(sb)->dqonoff_sem);
+		mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 		return -ESRCH;
 	}
 	mi = sb_dqopt(sb)->info + type;
@@ -1673,7 +1674,7 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
 	ii->dqi_flags = mi->dqi_flags & DQF_MASK;
 	ii->dqi_valid = IIF_ALL;
 	spin_unlock(&dq_data_lock);
-	up(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return 0;
 }
 
@@ -1682,9 +1683,9 @@ int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
 {
 	struct mem_dqinfo *mi;
 
-	down(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 	if (!sb_has_quota_enabled(sb, type)) {
-		up(&sb_dqopt(sb)->dqonoff_sem);
+		mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 		return -ESRCH;
 	}
 	mi = sb_dqopt(sb)->info + type;
@@ -1699,7 +1700,7 @@ int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
 	mark_info_dirty(sb, type);
 	/* Force write to disk */
 	sb->dq_op->write_info(sb, type);
-	up(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return 0;
 }
 

fs/ext3/super.c

@@ -2382,8 +2382,8 @@ static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
  * Process 1                         Process 2
  * ext3_create()                     quota_sync()
  *   journal_start()                   write_dquot()
- *   DQUOT_INIT()                        down(dqio_sem)
- *     down(dqio_sem)                    journal_start()
+ *   DQUOT_INIT()                        down(dqio_mutex)
+ *     down(dqio_mutex)                    journal_start()
  *
  */
 

fs/quota.c

@@ -170,10 +170,10 @@ static void quota_sync_sb(struct super_block *sb, int type)
 
 	/* Now when everything is written we can discard the pagecache so
 	 * that userspace sees the changes. We need i_mutex and so we could
-	 * not do it inside dqonoff_sem. Moreover we need to be carefull
+	 * not do it inside dqonoff_mutex. Moreover we need to be carefull
 	 * about races with quotaoff() (that is the reason why we have own
 	 * reference to inode). */
-	down(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		discard[cnt] = NULL;
 		if (type != -1 && cnt != type)
@@ -182,7 +182,7 @@ static void quota_sync_sb(struct super_block *sb, int type)
 			continue;
 		discard[cnt] = igrab(sb_dqopt(sb)->files[cnt]);
 	}
-	up(&sb_dqopt(sb)->dqonoff_sem);
+	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		if (discard[cnt]) {
 			mutex_lock(&discard[cnt]->i_mutex);

fs/quota_v2.c

@@ -394,7 +394,7 @@ static int v2_write_dquot(struct dquot *dquot)
 	ssize_t ret;
 	struct v2_disk_dqblk ddquot, empty;
 
-	/* dq_off is guarded by dqio_sem */
+	/* dq_off is guarded by dqio_mutex */
 	if (!dquot->dq_off)
 		if ((ret = dq_insert_tree(dquot)) < 0) {
 			printk(KERN_ERR "VFS: Error %zd occurred while creating quota.\n", ret);

fs/super.c

@@ -77,8 +77,8 @@ static struct super_block *alloc_super(void)
 		s->s_count = S_BIAS;
 		atomic_set(&s->s_active, 1);
 		sema_init(&s->s_vfs_rename_sem,1);
-		sema_init(&s->s_dquot.dqio_sem, 1);
-		sema_init(&s->s_dquot.dqonoff_sem, 1);
+		mutex_init(&s->s_dquot.dqio_mutex);
+		mutex_init(&s->s_dquot.dqonoff_mutex);
 		init_rwsem(&s->s_dquot.dqptr_sem);
 		init_waitqueue_head(&s->s_wait_unfrozen);
 		s->s_maxbytes = MAX_NON_LFS;

include/linux/quota.h

@@ -38,6 +38,7 @@
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/spinlock.h>
+#include <linux/mutex.h>
 
 #define __DQUOT_VERSION__	"dquot_6.5.1"
 #define __DQUOT_NUM_VERSION__	6*10000+5*100+1
@@ -215,7 +216,7 @@ struct dquot {
 	struct list_head dq_inuse;	/* List of all quotas */
 	struct list_head dq_free;	/* Free list element */
 	struct list_head dq_dirty;	/* List of dirty dquots */
-	struct semaphore dq_lock;	/* dquot IO lock */
+	struct mutex dq_lock;		/* dquot IO lock */
 	atomic_t dq_count;		/* Use count */
 	wait_queue_head_t dq_wait_unused;	/* Wait queue for dquot to become unused */
 	struct super_block *dq_sb;	/* superblock this applies to */
@@ -285,8 +286,8 @@ struct quota_format_type {
 
 struct quota_info {
 	unsigned int flags;			/* Flags for diskquotas on this device */
-	struct semaphore dqio_sem;		/* lock device while I/O in progress */
-	struct semaphore dqonoff_sem;		/* Serialize quotaon & quotaoff */
+	struct mutex dqio_mutex;		/* lock device while I/O in progress */
+	struct mutex dqonoff_mutex;		/* Serialize quotaon & quotaoff */
 	struct rw_semaphore dqptr_sem;		/* serialize ops using quota_info struct, pointers from inode to dquots */
 	struct inode *files[MAXQUOTAS];		/* inodes of quotafiles */
 	struct mem_dqinfo info[MAXQUOTAS];	/* Information for each quota type */