Merge commit 'quota/for_next'

3 files changed, 314 insertions, 83 deletions

diff --git a/fs/dquot.c b/fs/dquot.c
index 48c0571f831d..1a3a5d8c21ca 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -127,6 +127,7 @@
 
 static DEFINE_SPINLOCK(dq_list_lock);
 DEFINE_SPINLOCK(dq_data_lock);
+EXPORT_SYMBOL(dq_data_lock);
 
 static char *quotatypes[] = INITQFNAMES;
 static struct quota_format_type *quota_formats;	/* List of registered formats */
@@ -143,6 +144,7 @@ int register_quota_format(struct quota_format_type *fmt)
 	spin_unlock(&dq_list_lock);
 	return 0;
 }
+EXPORT_SYMBOL(register_quota_format);
 
 void unregister_quota_format(struct quota_format_type *fmt)
 {
@@ -154,6 +156,7 @@ void unregister_quota_format(struct quota_format_type *fmt)
 		*actqf = (*actqf)->qf_next;
 	spin_unlock(&dq_list_lock);
 }
+EXPORT_SYMBOL(unregister_quota_format);
 
 static struct quota_format_type *find_quota_format(int id)
 {
@@ -210,6 +213,7 @@ static unsigned int dq_hash_bits, dq_hash_mask;
 static struct hlist_head *dquot_hash;
 
 struct dqstats dqstats;
+EXPORT_SYMBOL(dqstats);
 
 static inline unsigned int
 hashfn(const struct super_block *sb, unsigned int id, int type)
@@ -304,6 +308,7 @@ int dquot_mark_dquot_dirty(struct dquot *dquot)
 	spin_unlock(&dq_list_lock);
 	return 0;
 }
+EXPORT_SYMBOL(dquot_mark_dquot_dirty);
 
 /* This function needs dq_list_lock */
 static inline int clear_dquot_dirty(struct dquot *dquot)
@@ -355,6 +360,7 @@ out_iolock:
 	mutex_unlock(&dquot->dq_lock);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_acquire);
 
 /*
  *	Write dquot to disk
@@ -384,6 +390,7 @@ out_sem:
 	mutex_unlock(&dqopt->dqio_mutex);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_commit);
 
 /*
  *	Release dquot
@@ -412,6 +419,7 @@ out_dqlock:
 	mutex_unlock(&dquot->dq_lock);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_release);
 
 void dquot_destroy(struct dquot *dquot)
 {
@@ -511,6 +519,7 @@ out:
 	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_scan_active);
 
 int vfs_quota_sync(struct super_block *sb, int type)
 {
@@ -558,6 +567,7 @@ int vfs_quota_sync(struct super_block *sb, int type)
 
 	return 0;
 }
+EXPORT_SYMBOL(vfs_quota_sync);
 
 /* Free unused dquots from cache */
 static void prune_dqcache(int count)
@@ -668,6 +678,7 @@ we_slept:
 	put_dquot_last(dquot);
 	spin_unlock(&dq_list_lock);
 }
+EXPORT_SYMBOL(dqput);
 
 struct dquot *dquot_alloc(struct super_block *sb, int type)
 {
@@ -713,6 +724,7 @@ int dquot_is_cached(struct super_block *sb, unsigned int id, int type)
 	spin_unlock(&dq_list_lock);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_is_cached);
 
 /*
  * Get reference to dquot
@@ -766,6 +778,7 @@ we_slept:
 
 	return dquot;
 }
+EXPORT_SYMBOL(dqget);
 
 static int dqinit_needed(struct inode *inode, int type)
 {
@@ -898,6 +911,28 @@ static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
 	dquot->dq_dqb.dqb_curspace += number;
 }
 
+static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
+{
+	dquot->dq_dqb.dqb_rsvspace += number;
+}
+
+/*
+ * Claim reserved quota space
+ */
+static void dquot_claim_reserved_space(struct dquot *dquot,
+						qsize_t number)
+{
+	WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
+	dquot->dq_dqb.dqb_curspace += number;
+	dquot->dq_dqb.dqb_rsvspace -= number;
+}
+
+static inline
+void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
+{
+	dquot->dq_dqb.dqb_rsvspace -= number;
+}
+
 static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
 {
 	if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
@@ -1067,7 +1102,11 @@ err_out:
 	kfree_skb(skb);
 }
 #endif
-
+/*
+ * Write warnings to the console and send warning messages over netlink.
+ *
+ * Note that this function can sleep.
+ */
 static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
 {
 	int i;
@@ -1128,13 +1167,18 @@ static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
 /* needs dq_data_lock */
 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
 {
+	qsize_t tspace;
+
 	*warntype = QUOTA_NL_NOWARN;
 	if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
 	    test_bit(DQ_FAKE_B, &dquot->dq_flags))
 		return QUOTA_OK;
 
+	tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
+		+ space;
+
 	if (dquot->dq_dqb.dqb_bhardlimit &&
-	    dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bhardlimit &&
+	    tspace > dquot->dq_dqb.dqb_bhardlimit &&
             !ignore_hardlimit(dquot)) {
 		if (!prealloc)
 			*warntype = QUOTA_NL_BHARDWARN;
@@ -1142,7 +1186,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war
 	}
 
 	if (dquot->dq_dqb.dqb_bsoftlimit &&
-	    dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
+	    tspace > dquot->dq_dqb.dqb_bsoftlimit &&
 	    dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
             !ignore_hardlimit(dquot)) {
 		if (!prealloc)
@@ -1151,7 +1195,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war
 	}
 
 	if (dquot->dq_dqb.dqb_bsoftlimit &&
-	    dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
+	    tspace > dquot->dq_dqb.dqb_bsoftlimit &&
 	    dquot->dq_dqb.dqb_btime == 0) {
 		if (!prealloc) {
 			*warntype = QUOTA_NL_BSOFTWARN;
@@ -1232,6 +1276,7 @@ out_err:
 	up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_initialize);
 
 /*
  * 	Release all quotas referenced by inode
@@ -1249,6 +1294,7 @@ int dquot_drop_locked(struct inode *inode)
 	}
 	return 0;
 }
+EXPORT_SYMBOL(dquot_drop_locked);
 
 int dquot_drop(struct inode *inode)
 {
@@ -1257,6 +1303,7 @@ int dquot_drop(struct inode *inode)
 	up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
 	return 0;
 }
+EXPORT_SYMBOL(dquot_drop);
 
 /* Wrapper to remove references to quota structures from inode */
 void vfs_dq_drop(struct inode *inode)
@@ -1279,6 +1326,7 @@ void vfs_dq_drop(struct inode *inode)
 			inode->i_sb->dq_op->drop(inode);
 	}
 }
+EXPORT_SYMBOL(vfs_dq_drop);
 
 /*
  * Following four functions update i_blocks+i_bytes fields and
@@ -1292,51 +1340,93 @@ void vfs_dq_drop(struct inode *inode)
 /*
  * This operation can block, but only after everything is updated
  */
-int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
+int __dquot_alloc_space(struct inode *inode, qsize_t number,
+			int warn, int reserve)
 {
-	int cnt, ret = NO_QUOTA;
+	int cnt, ret = QUOTA_OK;
 	char warntype[MAXQUOTAS];
 
-	/* 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);
-		return QUOTA_OK;
-	}
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 		warntype[cnt] = QUOTA_NL_NOWARN;
 
-	down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-	if (IS_NOQUOTA(inode)) {	/* Now we can do reliable test... */
-		up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-		goto out_add;
-	}
 	spin_lock(&dq_data_lock);
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		if (inode->i_dquot[cnt] == NODQUOT)
 			continue;
-		if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
-			goto warn_put_all;
+		if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
+		    == NO_QUOTA) {
+			ret = NO_QUOTA;
+			goto out_unlock;
+		}
 	}
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		if (inode->i_dquot[cnt] == NODQUOT)
 			continue;
-		dquot_incr_space(inode->i_dquot[cnt], number);
+		if (reserve)
+			dquot_resv_space(inode->i_dquot[cnt], number);
+		else
+			dquot_incr_space(inode->i_dquot[cnt], number);
 	}
-	inode_add_bytes(inode, number);
-	ret = QUOTA_OK;
-warn_put_all:
+	if (!reserve)
+		inode_add_bytes(inode, number);
+out_unlock:
 	spin_unlock(&dq_data_lock);
-	if (ret == QUOTA_OK)
-		/* Dirtify all the dquots - this can block when journalling */
-		for (cnt = 0; cnt < MAXQUOTAS; cnt++)
-			if (inode->i_dquot[cnt])
-				mark_dquot_dirty(inode->i_dquot[cnt]);
 	flush_warnings(inode->i_dquot, warntype);
+	return ret;
+}
+
+int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
+{
+	int cnt, ret = QUOTA_OK;
+
+	/*
+	 * First test before acquiring mutex - solves deadlocks when we
+	 * re-enter the quota code and are already holding the mutex
+	 */
+	if (IS_NOQUOTA(inode)) {
+		inode_add_bytes(inode, number);
+		goto out;
+	}
+
+	down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+	if (IS_NOQUOTA(inode)) {
+		inode_add_bytes(inode, number);
+		goto out_unlock;
+	}
+
+	ret = __dquot_alloc_space(inode, number, warn, 0);
+	if (ret == NO_QUOTA)
+		goto out_unlock;
+
+	/* Dirtify all the dquots - this can block when journalling */
+	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+		if (inode->i_dquot[cnt])
+			mark_dquot_dirty(inode->i_dquot[cnt]);
+out_unlock:
 	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
 	return ret;
 }
+EXPORT_SYMBOL(dquot_alloc_space);
+
+int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
+{
+	int ret = QUOTA_OK;
+
+	if (IS_NOQUOTA(inode))
+		goto out;
+
+	down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+	if (IS_NOQUOTA(inode))
+		goto out_unlock;
+
+	ret = __dquot_alloc_space(inode, number, warn, 1);
+out_unlock:
+	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+	return ret;
+}
+EXPORT_SYMBOL(dquot_reserve_space);
 
 /*
  * This operation can block, but only after everything is updated
@@ -1382,6 +1472,73 @@ warn_put_all:
 	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_alloc_inode);
+
+int dquot_claim_space(struct inode *inode, qsize_t number)
+{
+	int cnt;
+	int ret = QUOTA_OK;
+
+	if (IS_NOQUOTA(inode)) {
+		inode_add_bytes(inode, number);
+		goto out;
+	}
+
+	down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+	if (IS_NOQUOTA(inode))	{
+		up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+		inode_add_bytes(inode, number);
+		goto out;
+	}
+
+	spin_lock(&dq_data_lock);
+	/* Claim reserved quotas to allocated quotas */
+	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+		if (inode->i_dquot[cnt] != NODQUOT)
+			dquot_claim_reserved_space(inode->i_dquot[cnt],
+							number);
+	}
+	/* Update inode bytes */
+	inode_add_bytes(inode, number);
+	spin_unlock(&dq_data_lock);
+	/* Dirtify all the dquots - this can block when journalling */
+	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+		if (inode->i_dquot[cnt])
+			mark_dquot_dirty(inode->i_dquot[cnt]);
+	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+	return ret;
+}
+EXPORT_SYMBOL(dquot_claim_space);
+
+/*
+ * Release reserved quota space
+ */
+void dquot_release_reserved_space(struct inode *inode, qsize_t number)
+{
+	int cnt;
+
+	if (IS_NOQUOTA(inode))
+		goto out;
+
+	down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+	if (IS_NOQUOTA(inode))
+		goto out_unlock;
+
+	spin_lock(&dq_data_lock);
+	/* Release reserved dquots */
+	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+		if (inode->i_dquot[cnt] != NODQUOT)
+			dquot_free_reserved_space(inode->i_dquot[cnt], number);
+	}
+	spin_unlock(&dq_data_lock);
+
+out_unlock:
+	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+	return;
+}
+EXPORT_SYMBOL(dquot_release_reserved_space);
 
 /*
  * This operation can block, but only after everything is updated
@@ -1422,6 +1579,7 @@ out_sub:
 	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
 	return QUOTA_OK;
 }
+EXPORT_SYMBOL(dquot_free_space);
 
 /*
  * This operation can block, but only after everything is updated
@@ -1458,6 +1616,20 @@ int dquot_free_inode(const struct inode *inode, qsize_t number)
 	up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
 	return QUOTA_OK;
 }
+EXPORT_SYMBOL(dquot_free_inode);
+
+/*
+ * call back function, get reserved quota space from underlying fs
+ */
+qsize_t dquot_get_reserved_space(struct inode *inode)
+{
+	qsize_t reserved_space = 0;
+
+	if (sb_any_quota_active(inode->i_sb) &&
+	    inode->i_sb->dq_op->get_reserved_space)
+		reserved_space = inode->i_sb->dq_op->get_reserved_space(inode);
+	return reserved_space;
+}
 
 /*
  * Transfer the number of inode and blocks from one diskquota to an other.
@@ -1467,7 +1639,8 @@ int dquot_free_inode(const struct inode *inode, qsize_t number)
  */
 int dquot_transfer(struct inode *inode, struct iattr *iattr)
 {
-	qsize_t space;
+	qsize_t space, cur_space;
+	qsize_t rsv_space = 0;
 	struct dquot *transfer_from[MAXQUOTAS];
 	struct dquot *transfer_to[MAXQUOTAS];
 	int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid,
@@ -1508,7 +1681,9 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
 		}
 	}
 	spin_lock(&dq_data_lock);
-	space = inode_get_bytes(inode);
+	cur_space = inode_get_bytes(inode);
+	rsv_space = dquot_get_reserved_space(inode);
+	space = cur_space + rsv_space;
 	/* Build the transfer_from list and check the limits */
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		if (transfer_to[cnt] == NODQUOT)
@@ -1537,11 +1712,14 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
 			warntype_from_space[cnt] =
 				info_bdq_free(transfer_from[cnt], space);
 			dquot_decr_inodes(transfer_from[cnt], 1);
-			dquot_decr_space(transfer_from[cnt], space);
+			dquot_decr_space(transfer_from[cnt], cur_space);
+			dquot_free_reserved_space(transfer_from[cnt],
+						  rsv_space);
 		}
 
 		dquot_incr_inodes(transfer_to[cnt], 1);
-		dquot_incr_space(transfer_to[cnt], space);
+		dquot_incr_space(transfer_to[cnt], cur_space);
+		dquot_resv_space(transfer_to[cnt], rsv_space);
 
 		inode->i_dquot[cnt] = transfer_to[cnt];
 	}
@@ -1568,6 +1746,7 @@ warn_put_all:
 	up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_transfer);
 
 /* Wrapper for transferring ownership of an inode */
 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
@@ -1579,7 +1758,7 @@ int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
 	}
 	return 0;
 }
-
+EXPORT_SYMBOL(vfs_dq_transfer);
 
 /*
  * Write info of quota file to disk
@@ -1594,6 +1773,7 @@ int dquot_commit_info(struct super_block *sb, int type)
 	mutex_unlock(&dqopt->dqio_mutex);
 	return ret;
 }
+EXPORT_SYMBOL(dquot_commit_info);
 
 /*
  * Definitions of diskquota operations.
@@ -1741,13 +1921,14 @@ put_inodes:
 		}
 	return ret;
 }
+EXPORT_SYMBOL(vfs_quota_disable);
 
 int vfs_quota_off(struct super_block *sb, int type, int remount)
 {
 	return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
 				 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
 }
-
+EXPORT_SYMBOL(vfs_quota_off);
 /*
  *	Turn quotas on on a device
  */
@@ -1900,6 +2081,7 @@ int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
 					     DQUOT_LIMITS_ENABLED);
 	return error;
 }
+EXPORT_SYMBOL(vfs_quota_on_path);
 
 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
 		 int remount)
@@ -1917,6 +2099,7 @@ int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
 	}
 	return error;
 }
+EXPORT_SYMBOL(vfs_quota_on);
 
 /*
  * More powerful function for turning on quotas allowing setting
@@ -1961,6 +2144,7 @@ out_lock:
 load_quota:
 	return vfs_load_quota_inode(inode, type, format_id, flags);
 }
+EXPORT_SYMBOL(vfs_quota_enable);
 
 /*
  * This function is used when filesystem needs to initialize quotas
@@ -1990,6 +2174,7 @@ out:
 	dput(dentry);
 	return error;
 }
+EXPORT_SYMBOL(vfs_quota_on_mount);
 
 /* Wrapper to turn on quotas when remounting rw */
 int vfs_dq_quota_on_remount(struct super_block *sb)
@@ -2006,6 +2191,7 @@ int vfs_dq_quota_on_remount(struct super_block *sb)
 	}
 	return ret;
 }
+EXPORT_SYMBOL(vfs_dq_quota_on_remount);
 
 static inline qsize_t qbtos(qsize_t blocks)
 {
@@ -2025,7 +2211,7 @@ static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
 	spin_lock(&dq_data_lock);
 	di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
 	di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
-	di->dqb_curspace = dm->dqb_curspace;
+	di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
 	di->dqb_ihardlimit = dm->dqb_ihardlimit;
 	di->dqb_isoftlimit = dm->dqb_isoftlimit;
 	di->dqb_curinodes = dm->dqb_curinodes;
@@ -2049,6 +2235,7 @@ int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d
 	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return 0;
 }
+EXPORT_SYMBOL(vfs_get_dqblk);
 
 /* Generic routine for setting common part of quota structure */
 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
@@ -2067,7 +2254,7 @@ static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
 
 	spin_lock(&dq_data_lock);
 	if (di->dqb_valid & QIF_SPACE) {
-		dm->dqb_curspace = di->dqb_curspace;
+		dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
 		check_blim = 1;
 		__set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 	}
@@ -2142,6 +2329,7 @@ out:
 	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return rc;
 }
+EXPORT_SYMBOL(vfs_set_dqblk);
 
 /* Generic routine for getting common part of quota file information */
 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
@@ -2163,6 +2351,7 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
 	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return 0;
 }
+EXPORT_SYMBOL(vfs_get_dqinfo);
 
 /* Generic routine for setting common part of quota file information */
 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
@@ -2191,6 +2380,7 @@ out:
 	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 	return err;
 }
+EXPORT_SYMBOL(vfs_set_dqinfo);
 
 struct quotactl_ops vfs_quotactl_ops = {
 	.quota_on	= vfs_quota_on,
@@ -2346,39 +2536,3 @@ static int __init dquot_init(void)
 	return 0;
 }
 module_init(dquot_init);
-
-EXPORT_SYMBOL(register_quota_format);
-EXPORT_SYMBOL(unregister_quota_format);
-EXPORT_SYMBOL(dqstats);
-EXPORT_SYMBOL(dq_data_lock);
-EXPORT_SYMBOL(vfs_quota_enable);
-EXPORT_SYMBOL(vfs_quota_on);
-EXPORT_SYMBOL(vfs_quota_on_path);
-EXPORT_SYMBOL(vfs_quota_on_mount);
-EXPORT_SYMBOL(vfs_quota_disable);
-EXPORT_SYMBOL(vfs_quota_off);
-EXPORT_SYMBOL(dquot_scan_active);
-EXPORT_SYMBOL(vfs_quota_sync);
-EXPORT_SYMBOL(vfs_get_dqinfo);
-EXPORT_SYMBOL(vfs_set_dqinfo);
-EXPORT_SYMBOL(vfs_get_dqblk);
-EXPORT_SYMBOL(vfs_set_dqblk);
-EXPORT_SYMBOL(dquot_commit);
-EXPORT_SYMBOL(dquot_commit_info);
-EXPORT_SYMBOL(dquot_acquire);
-EXPORT_SYMBOL(dquot_release);
-EXPORT_SYMBOL(dquot_mark_dquot_dirty);
-EXPORT_SYMBOL(dquot_initialize);
-EXPORT_SYMBOL(dquot_drop);
-EXPORT_SYMBOL(dquot_drop_locked);
-EXPORT_SYMBOL(vfs_dq_drop);
-EXPORT_SYMBOL(dqget);
-EXPORT_SYMBOL(dqput);
-EXPORT_SYMBOL(dquot_is_cached);
-EXPORT_SYMBOL(dquot_alloc_space);
-EXPORT_SYMBOL(dquot_alloc_inode);
-EXPORT_SYMBOL(dquot_free_space);
-EXPORT_SYMBOL(dquot_free_inode);
-EXPORT_SYMBOL(dquot_transfer);
-EXPORT_SYMBOL(vfs_dq_transfer);
-EXPORT_SYMBOL(vfs_dq_quota_on_remount);
diff --git a/include/linux/quota.h b/include/linux/quota.h
index d72d5d84fde5..a510d91561f4 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -198,6 +198,7 @@ struct mem_dqblk {
 	qsize_t dqb_bhardlimit;	/* absolute limit on disk blks alloc */
 	qsize_t dqb_bsoftlimit;	/* preferred limit on disk blks */
 	qsize_t dqb_curspace;	/* current used space */
+	qsize_t dqb_rsvspace;   /* current reserved space for delalloc*/
 	qsize_t dqb_ihardlimit;	/* absolute limit on allocated inodes */
 	qsize_t dqb_isoftlimit;	/* preferred inode limit */
 	qsize_t dqb_curinodes;	/* current # allocated inodes */
@@ -308,6 +309,14 @@ struct dquot_operations {
 	int (*release_dquot) (struct dquot *);		/* Quota is going to be deleted from disk */
 	int (*mark_dirty) (struct dquot *);		/* Dquot is marked dirty */
 	int (*write_info) (struct super_block *, int);	/* Write of quota "superblock" */
+	/* reserve quota for delayed block allocation */
+	int (*reserve_space) (struct inode *, qsize_t, int);
+	/* claim reserved quota for delayed alloc */
+	int (*claim_space) (struct inode *, qsize_t);
+	/* release rsved quota for delayed alloc */
+	void (*release_rsv) (struct inode *, qsize_t);
+	/* get reserved quota for delayed alloc */
+	qsize_t (*get_reserved_space) (struct inode *);
 };
 
 /* Operations handling requests from userspace */
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 21b781a3350f..352921b6ea0a 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -37,6 +37,11 @@ void dquot_destroy(struct dquot *dquot);
 int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
 int dquot_alloc_inode(const struct inode *inode, qsize_t number);
 
+int dquot_reserve_space(struct inode *inode, qsize_t number, int prealloc);
+int dquot_claim_space(struct inode *inode, qsize_t number);
+void dquot_release_reserved_space(struct inode *inode, qsize_t number);
+qsize_t dquot_get_reserved_space(struct inode *inode);
+
 int dquot_free_space(struct inode *inode, qsize_t number);
 int dquot_free_inode(const struct inode *inode, qsize_t number);
 
@@ -185,6 +190,16 @@ static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 	return ret;
 }
 
+static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
+{
+	if (sb_any_quota_active(inode->i_sb)) {
+		/* Used space is updated in alloc_space() */
+		if (inode->i_sb->dq_op->reserve_space(inode, nr, 0) == NO_QUOTA)
+			return 1;
+	}
+	return 0;
+}
+
 static inline int vfs_dq_alloc_inode(struct inode *inode)
 {
 	if (sb_any_quota_active(inode->i_sb)) {
@@ -195,6 +210,31 @@ static inline int vfs_dq_alloc_inode(struct inode *inode)
 	return 0;
 }
 
+/*
+ * Convert in-memory reserved quotas to real consumed quotas
+ */
+static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
+{
+	if (sb_any_quota_active(inode->i_sb)) {
+		if (inode->i_sb->dq_op->claim_space(inode, nr) == NO_QUOTA)
+			return 1;
+	} else
+		inode_add_bytes(inode, nr);
+
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+/*
+ * Release reserved (in-memory) quotas
+ */
+static inline
+void vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
+{
+	if (sb_any_quota_active(inode->i_sb))
+		inode->i_sb->dq_op->release_rsv(inode, nr);
+}
+
 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 {
 	if (sb_any_quota_active(inode->i_sb))
@@ -341,6 +381,22 @@ static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 	return 0;
 }
 
+static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
+{
+	return 0;
+}
+
+static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
+{
+	return vfs_dq_alloc_space(inode, nr);
+}
+
+static inline
+int vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
+{
+	return 0;
+}
+
 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 {
 	inode_sub_bytes(inode, nr);
@@ -356,36 +412,48 @@ static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 
 static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 {
-	return vfs_dq_prealloc_space_nodirty(inode,
-			nr << inode->i_sb->s_blocksize_bits);
+	return vfs_dq_prealloc_space_nodirty(inode, nr << inode->i_blkbits);
 }
 
 static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
 {
-	return vfs_dq_prealloc_space(inode,
-			nr << inode->i_sb->s_blocksize_bits);
+	return vfs_dq_prealloc_space(inode, nr << inode->i_blkbits);
 }
 
 static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 {
- 	return vfs_dq_alloc_space_nodirty(inode,
-			nr << inode->i_sb->s_blocksize_bits);
+	return vfs_dq_alloc_space_nodirty(inode, nr << inode->i_blkbits);
 }
 
 static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
 {
-	return vfs_dq_alloc_space(inode,
-			nr << inode->i_sb->s_blocksize_bits);
+	return vfs_dq_alloc_space(inode, nr << inode->i_blkbits);
+}
+
+static inline int vfs_dq_reserve_block(struct inode *inode, qsize_t nr)
+{
+	return vfs_dq_reserve_space(inode, nr << inode->i_blkbits);
+}
+
+static inline int vfs_dq_claim_block(struct inode *inode, qsize_t nr)
+{
+	return vfs_dq_claim_space(inode, nr << inode->i_blkbits);
+}
+
+static inline
+void vfs_dq_release_reservation_block(struct inode *inode, qsize_t nr)
+{
+	vfs_dq_release_reservation_space(inode, nr << inode->i_blkbits);
 }
 
 static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
 {
-	vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
+	vfs_dq_free_space_nodirty(inode, nr << inode->i_blkbits);
 }
 
 static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
 {
-	vfs_dq_free_space(inode, nr << inode->i_sb->s_blocksize_bits);
+	vfs_dq_free_space(inode, nr << inode->i_blkbits);
 }
 
 /*