[Ocfs2-devel] [PATCH 28/29] ocfs2: Implement quota recovery

[Jan Kara <jack@suse.cz>]

Implement functions for recovery after a crash. Functions just
read local quota file and sync info to global quota file.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ocfs2/journal.c      |  105 +++++++++---
 fs/ocfs2/journal.h      |    1 +
 fs/ocfs2/ocfs2.h        |    4 +-
 fs/ocfs2/quota.h        |   21 +++
 fs/ocfs2/quota_global.c |    1 -
 fs/ocfs2/quota_local.c  |  430 ++++++++++++++++++++++++++++++++++++++++++++++-
 6 files changed, 530 insertions(+), 32 deletions(-)

diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index f3d7c15..d928db9 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -45,6 +45,7 @@
 #include "slot_map.h"
 #include "super.h"
 #include "sysfile.h"
+#include "quota.h"
 
 #include "buffer_head_io.h"
 
@@ -52,7 +53,7 @@ DEFINE_SPINLOCK(trans_inc_lock);
 
 static int ocfs2_force_read_journal(struct inode *inode);
 static int ocfs2_recover_node(struct ocfs2_super *osb,
-			      int node_num);
+			      int node_num, int slot_num);
 static int __ocfs2_recovery_thread(void *arg);
 static int ocfs2_commit_cache(struct ocfs2_super *osb);
 static int ocfs2_wait_on_mount(struct ocfs2_super *osb);
@@ -877,6 +878,7 @@ struct ocfs2_la_recovery_item {
 	int			lri_slot;
 	struct ocfs2_dinode	*lri_la_dinode;
 	struct ocfs2_dinode	*lri_tl_dinode;
+	struct ocfs2_quota_recovery *lri_qrec;
 };
 
 /* Does the second half of the recovery process. By this point, the
@@ -897,6 +899,7 @@ void ocfs2_complete_recovery(struct work_struct *work)
 	struct ocfs2_super *osb = journal->j_osb;
 	struct ocfs2_dinode *la_dinode, *tl_dinode;
 	struct ocfs2_la_recovery_item *item, *n;
+	struct ocfs2_quota_recovery *qrec;
 	LIST_HEAD(tmp_la_list);
 
 	mlog_entry_void();
@@ -942,6 +945,16 @@ void ocfs2_complete_recovery(struct work_struct *work)
 		if (ret < 0)
 			mlog_errno(ret);
 
+		qrec = item->lri_qrec;
+		if (qrec) {
+			mlog(0, "Recovering quota files");
+			ret = ocfs2_finish_quota_recovery(osb, qrec,
+							  item->lri_slot);
+			if (ret < 0)
+				mlog_errno(ret);
+			/* Recovery info is already freed now */
+		}
+
 		kfree(item);
 	}
 
@@ -955,7 +968,8 @@ void ocfs2_complete_recovery(struct work_struct *work)
 static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
 					    int slot_num,
 					    struct ocfs2_dinode *la_dinode,
-					    struct ocfs2_dinode *tl_dinode)
+					    struct ocfs2_dinode *tl_dinode,
+					    struct ocfs2_quota_recovery *qrec)
 {
 	struct ocfs2_la_recovery_item *item;
 
@@ -970,6 +984,9 @@ static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
 		if (tl_dinode)
 			kfree(tl_dinode);
 
+		if (qrec)
+			ocfs2_free_quota_recovery(qrec);
+
 		mlog_errno(-ENOMEM);
 		return;
 	}
@@ -978,6 +995,7 @@ static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
 	item->lri_la_dinode = la_dinode;
 	item->lri_slot = slot_num;
 	item->lri_tl_dinode = tl_dinode;
+	item->lri_qrec = qrec;
 
 	spin_lock(&journal->j_lock);
 	list_add_tail(&item->lri_list, &journal->j_la_cleanups);
@@ -997,6 +1015,7 @@ void ocfs2_complete_mount_recovery(struct ocfs2_super *osb)
 		ocfs2_queue_recovery_completion(journal,
 						osb->slot_num,
 						osb->local_alloc_copy,
+						NULL,
 						NULL);
 		ocfs2_schedule_truncate_log_flush(osb, 0);
 
@@ -1005,11 +1024,26 @@ void ocfs2_complete_mount_recovery(struct ocfs2_super *osb)
 	}
 }
 
+void ocfs2_complete_quota_recovery(struct ocfs2_super *osb)
+{
+	if (osb->quota_rec) {
+		ocfs2_queue_recovery_completion(osb->journal,
+						osb->slot_num,
+						NULL,
+						NULL,
+						osb->quota_rec);
+		osb->quota_rec = NULL;
+	}
+}
+
 static int __ocfs2_recovery_thread(void *arg)
 {
-	int status, node_num;
+	int status, node_num, slot_num;
 	struct ocfs2_super *osb = arg;
 	struct ocfs2_recovery_map *rm = osb->recovery_map;
+	int *rm_quota = NULL;
+	int rm_quota_used = 0, i;
+	struct ocfs2_quota_recovery *qrec;
 
 	mlog_entry_void();
 
@@ -1018,6 +1052,11 @@ static int __ocfs2_recovery_thread(void *arg)
 		goto bail;
 	}
 
+	rm_quota = kzalloc(osb->max_slots * sizeof(int), GFP_NOFS);
+	if (!rm_quota) {
+		status = -ENOMEM;
+		goto bail;
+	}
 restart:
 	status = ocfs2_super_lock(osb, 1);
 	if (status < 0) {
@@ -1031,8 +1070,28 @@ restart:
 		 * clear it until ocfs2_recover_node() has succeeded. */
 		node_num = rm->rm_entries[0];
 		spin_unlock(&osb->osb_lock);
-
-		status = ocfs2_recover_node(osb, node_num);
+		mlog(0, "checking node %d\n", node_num);
+		slot_num = ocfs2_node_num_to_slot(osb, node_num);
+		if (slot_num == -ENOENT) {
+			status = 0;
+			mlog(0, "no slot for this node, so no recovery"
+			     "required.\n");
+			goto skip_recovery;
+		}
+		mlog(0, "node %d was using slot %d\n", node_num, slot_num);
+
+		/* It is a bit subtle with quota recovery. We cannot do it
+		 * immediately because we have to obtain cluster locks from
+		 * quota files and we also don't want to just skip it because
+		 * then quota usage would be out of sync until some node takes
+		 * the slot. So we remember which nodes need quota recovery
+		 * and when everything else is done, we recover quotas. */
+		for (i = 0; i < rm_quota_used && rm_quota[i] != slot_num; i++);
+		if (i == rm_quota_used)
+			rm_quota[rm_quota_used++] = slot_num;
+
+		status = ocfs2_recover_node(osb, node_num, slot_num);
+skip_recovery:
 		if (!status) {
 			ocfs2_recovery_map_clear(osb, node_num);
 		} else {
@@ -1056,11 +1115,22 @@ restart:
 
 	ocfs2_super_unlock(osb, 1);
 
+	/* Now it is right time to recover quotas... */
+	for (i = 0; i < rm_quota_used; i++) {
+		qrec = ocfs2_begin_quota_recovery(osb, rm_quota[i]);
+		if (IS_ERR(qrec)) {
+			status = PTR_ERR(qrec);
+			mlog_errno(status);
+		}
+		ocfs2_queue_recovery_completion(osb->journal, rm_quota[i],
+						NULL, NULL, qrec);
+	}
+
 	/* We always run recovery on our own orphan dir - the dead
 	 * node(s) may have disallowd a previos inode delete. Re-processing
 	 * is therefore required. */
 	ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL,
-					NULL);
+					NULL, NULL);
 
 bail:
 	mutex_lock(&osb->recovery_lock);
@@ -1075,6 +1145,9 @@ bail:
 
 	mutex_unlock(&osb->recovery_lock);
 
+	if (rm_quota)
+		kfree(rm_quota);
+
 	mlog_exit(status);
 	/* no one is callint kthread_stop() for us so the kthread() api
 	 * requires that we call do_exit().  And it isn't exported, but
@@ -1303,31 +1376,19 @@ done:
  * far less concerning.
  */
 static int ocfs2_recover_node(struct ocfs2_super *osb,
-			      int node_num)
+			      int node_num, int slot_num)
 {
 	int status = 0;
-	int slot_num;
 	struct ocfs2_dinode *la_copy = NULL;
 	struct ocfs2_dinode *tl_copy = NULL;
 
-	mlog_entry("(node_num=%d, osb->node_num = %d)\n",
-		   node_num, osb->node_num);
-
-	mlog(0, "checking node %d\n", node_num);
+	mlog_entry("(node_num=%d, slot_num=%d, osb->node_num = %d)\n",
+		   node_num, slot_num, osb->node_num);
 
 	/* Should not ever be called to recover ourselves -- in that
 	 * case we should've called ocfs2_journal_load instead. */
 	BUG_ON(osb->node_num == node_num);
 
-	slot_num = ocfs2_node_num_to_slot(osb, node_num);
-	if (slot_num == -ENOENT) {
-		status = 0;
-		mlog(0, "no slot for this node, so no recovery required.\n");
-		goto done;
-	}
-
-	mlog(0, "node %d was using slot %d\n", node_num, slot_num);
-
 	status = ocfs2_replay_journal(osb, node_num, slot_num);
 	if (status < 0) {
 		if (status == -EBUSY) {
@@ -1363,7 +1424,7 @@ static int ocfs2_recover_node(struct ocfs2_super *osb,
 
 	/* This will kfree the memory pointed to by la_copy and tl_copy */
 	ocfs2_queue_recovery_completion(osb->journal, slot_num, la_copy,
-					tl_copy);
+					tl_copy, NULL);
 
 	status = 0;
 done:
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index c13bd8c..f10a564 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -173,6 +173,7 @@ void   ocfs2_recovery_thread(struct ocfs2_super *osb,
 			     int node_num);
 int    ocfs2_mark_dead_nodes(struct ocfs2_super *osb);
 void   ocfs2_complete_mount_recovery(struct ocfs2_super *osb);
+void ocfs2_complete_quota_recovery(struct ocfs2_super *osb);
 
 static inline void ocfs2_start_checkpoint(struct ocfs2_super *osb)
 {
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index a21a465..37c2e29 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -205,6 +205,7 @@ enum ocfs2_mount_options
 struct ocfs2_journal;
 struct ocfs2_slot_info;
 struct ocfs2_recovery_map;
+struct ocfs2_quota_recovery;
 struct ocfs2_super
 {
 	struct task_struct *commit_task;
@@ -286,10 +287,11 @@ struct ocfs2_super
 	char *local_alloc_debug_buf;
 #endif
 
-	/* Next two fields are for local node slot recovery during
+	/* Next three fields are for local node slot recovery during
 	 * mount. */
 	int dirty;
 	struct ocfs2_dinode *local_alloc_copy;
+	struct ocfs2_quota_recovery *quota_rec;
 
 	struct ocfs2_alloc_stats alloc_stats;
 	char dev_str[20];		/* "major,minor" of the device */
diff --git a/fs/ocfs2/quota.h b/fs/ocfs2/quota.h
index 179c635..7c4d771 100644
--- a/fs/ocfs2/quota.h
+++ b/fs/ocfs2/quota.h
@@ -38,6 +38,17 @@ struct ocfs2_dquot {
 	s64 dq_originodes;	/* Last globally synced inode usage */
 };
 
+/* Description of one chunk to recover in memory */
+struct ocfs2_recovery_chunk {
+	struct list_head rc_list;	/* List of chunks */
+	int rc_chunk;			/* Chunk number */
+	unsigned long *rc_bitmap;	/* Bitmap of entries to recover */
+};
+
+struct ocfs2_quota_recovery {
+	struct list_head r_list[MAXQUOTAS];	/* List of chunks to recover */
+};
+
 /* In-memory structure with quota header information */
 struct ocfs2_mem_dqinfo {
 	unsigned int dqi_type;		/* Quota type this structure describes */
@@ -54,6 +65,10 @@ struct ocfs2_mem_dqinfo {
 	struct buffer_head *dqi_ibh;	/* Buffer with information header */
 	struct qtree_mem_dqinfo dqi_gi;	/* Info about global file */
 	struct timer_list dqi_sync_timer;	/* Timer for syncing dquots */
+	struct ocfs2_quota_recovery *dqi_rec;	/* Pointer to recovery
+						 * information, in case we
+						 * enable quotas on file
+						 * needing it */
 };
 
 static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
@@ -72,6 +87,12 @@ extern struct kmem_cache *ocfs2_qf_chunk_cachep;
 
 extern struct qtree_fmt_operations ocfs2_global_ops;
 
+struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
+				struct ocfs2_super *osb, int slot_num);
+int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
+				struct ocfs2_quota_recovery *rec,
+				int slot_num);
+void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 			 size_t len, loff_t off);
 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 39b860f..2ba4763 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -85,7 +85,6 @@ struct qtree_fmt_operations ocfs2_global_ops = {
 	.is_id = ocfs2_global_is_id,
 };
 
-
 struct buffer_head *ocfs2_read_quota_block(struct inode *inode,
 					   int block, int *err)
 {
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 1db7a16..cad01d6 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -49,14 +49,25 @@ static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
 	return 1 + (ol_chunk_blocks(sb) + 1) * c;
 }
 
-/* Offset of the dquot structure in the quota file */
-static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
+static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
+{
+	int epb = ol_quota_entries_per_block(sb);
+
+	return ol_quota_chunk_block(sb, c) + 1 + off / epb;
+}
+
+static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
 {
 	int epb = ol_quota_entries_per_block(sb);
 
-	return ((ol_quota_chunk_block(sb, c) + 1 + off / epb)
-		<< sb->s_blocksize_bits) +
-		(off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
+	return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
+}
+
+/* Offset of the dquot structure in the quota file */
+static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
+{
+	return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
+	       ol_dqblk_block_off(sb, c, off);
 }
 
 /* Compute block number from given offset */
@@ -253,6 +264,384 @@ static void olq_update_info(struct buffer_head *bh, void *private)
 	spin_unlock(&dq_data_lock);
 }
 
+static int ocfs2_add_recovery_chunk(struct super_block *sb,
+				    struct ocfs2_local_disk_chunk *dchunk,
+				    int chunk,
+				    struct list_head *head)
+{
+	struct ocfs2_recovery_chunk *rc;
+
+	rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
+	if (!rc)
+		return -ENOMEM;
+	rc->rc_chunk = chunk;
+	rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
+	if (!rc->rc_bitmap) {
+		kfree(rc);
+		return -ENOMEM;
+	}
+	memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
+	       (ol_chunk_entries(sb) + 7) >> 3);
+	list_add_tail(&rc->rc_list, head);
+	return 0;
+}
+
+static void free_recovery_list(struct list_head *head)
+{
+	struct ocfs2_recovery_chunk *next;
+	struct ocfs2_recovery_chunk *rchunk;
+
+	list_for_each_entry_safe(rchunk, next, head, rc_list) {
+		list_del(&rchunk->rc_list);
+		kfree(rchunk->rc_bitmap);
+		kfree(rchunk);
+	}
+}
+
+void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
+{
+	int type;
+
+	for (type = 0; type < MAXQUOTAS; type++)
+		free_recovery_list(&(rec->r_list[type]));
+	kfree(rec);
+}
+
+/* Load entries in our quota file we have to recover*/
+static int ocfs2_recovery_load_quota(struct inode *lqinode,
+				     struct ocfs2_local_disk_dqinfo *ldinfo,
+				     int type,
+				     struct list_head *head)
+{
+	struct super_block *sb = lqinode->i_sb;
+	struct buffer_head *hbh;
+	struct ocfs2_local_disk_chunk *dchunk;
+	int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
+	int status = 0;
+
+	for (i = 0; i < chunks; i++) {
+		hbh = ocfs2_read_quota_block(lqinode,
+					     ol_quota_chunk_block(sb, i),
+					     &status);
+		if (!hbh) {
+			mlog_errno(status);
+			break;
+		}
+		dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
+		if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
+			status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
+		brelse(hbh);
+		if (status < 0)
+			break;
+	}
+	if (status < 0)
+		free_recovery_list(head);
+	return status;
+}
+
+static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
+{
+	int type;
+	struct ocfs2_quota_recovery *rec;
+
+	rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
+	if (!rec)
+		return NULL;
+	for (type = 0; type < MAXQUOTAS; type++)
+		INIT_LIST_HEAD(&(rec->r_list[type]));
+	return rec;
+}
+
+/* Load information we need for quota recovery into memory */
+struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
+						struct ocfs2_super *osb,
+						int slot_num)
+{
+	unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
+					    OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
+	unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
+					LOCAL_GROUP_QUOTA_SYSTEM_INODE };
+	struct super_block *sb = osb->sb;
+	struct ocfs2_local_disk_dqinfo *ldinfo;
+	struct inode *lqinode;
+	struct buffer_head *bh;
+	int type;
+	int status;
+	struct ocfs2_quota_recovery *rec;
+
+	mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
+	rec = ocfs2_alloc_quota_recovery();
+	if (!rec)
+		return ERR_PTR(-ENOMEM);
+	/* First init... */
+
+	for (type = 0; type < MAXQUOTAS; type++) {
+		if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
+			continue;
+		lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
+		if (!lqinode) {
+			status = -ENOENT;
+			goto out;
+		}
+		status = ocfs2_inode_lock_full(lqinode, NULL, 1,
+						       OCFS2_META_LOCK_NOQUEUE);
+		/* Someone else is holding the lock? Then he must be
+		 * doing the recovery. Just skip the file... */
+		if (status == -EAGAIN) {
+			mlog(ML_NOTICE, "skipping quota recovery for slot %d "
+			     "because quota file is locked.\n", slot_num);
+			status = 0;
+			goto out_put;
+		} else if (status < 0) {
+			mlog_errno(status);
+			goto out_put;
+		}
+		/* Now read local header */
+		bh = ocfs2_read_quota_block(lqinode, 0, &status);
+		if (!bh) {
+			mlog_errno(status);
+			mlog(ML_ERROR, "failed to read quota file info header "
+				"(slot=%d type=%d)\n", slot_num, type);
+			goto out_lock;
+		}
+		ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
+							OCFS2_LOCAL_INFO_OFF);
+		status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
+						   &rec->r_list[type]);
+		brelse(bh);
+out_lock:
+		ocfs2_inode_unlock(lqinode, 1);
+out_put:
+		iput(lqinode);
+		if (status < 0)
+			break;
+	}
+out:
+	if (status < 0) {
+		ocfs2_free_quota_recovery(rec);
+		rec = ERR_PTR(status);
+	}
+	return rec;
+}
+
+/* Sync changes in local quota file into global quota file and
+ * reinitialize local quota file.
+ * The function expects local quota file to be already locked and
+ * dqonoff_mutex locked. */
+static int ocfs2_recover_local_quota_file(struct inode *lqinode,
+					  int type,
+					  struct ocfs2_quota_recovery *rec)
+{
+	struct super_block *sb = lqinode->i_sb;
+	struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
+	struct ocfs2_local_disk_chunk *dchunk;
+	struct ocfs2_local_disk_dqblk *dqblk;
+	struct dquot *dquot;
+	handle_t *handle;
+	struct buffer_head *hbh = NULL, *qbh = NULL;
+	int status = 0;
+	int bit, chunk;
+	struct ocfs2_recovery_chunk *rchunk, *next;
+	qsize_t spacechange, inodechange;
+
+	mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
+
+	status = ocfs2_lock_global_qf(oinfo, 1);
+	if (status < 0)
+		goto out;
+
+	list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
+		chunk = rchunk->rc_chunk;
+		hbh = ocfs2_read_quota_block(lqinode,
+					     ol_quota_chunk_block(sb, chunk),
+					     &status);
+		if (!hbh) {
+			mlog_errno(status);
+			break;
+		}
+		dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
+		for_each_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
+			qbh = ocfs2_read_quota_block(lqinode,
+						ol_dqblk_block(sb, chunk, bit),
+						&status);
+			if (!qbh) {
+				mlog_errno(status);
+				break;
+			}
+			dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
+				ol_dqblk_block_off(sb, chunk, bit));
+			dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
+			if (!dquot) {
+				status = -EIO;
+				mlog(ML_ERROR, "Failed to get quota structure "
+				     "for id %u, type %d. Cannot finish quota "
+				     "file recovery.\n",
+				     (unsigned)le64_to_cpu(dqblk->dqb_id),
+				     type);
+				goto out_put_bh;
+			}
+			handle = ocfs2_start_trans(OCFS2_SB(sb),
+						   OCFS2_QSYNC_CREDITS);
+			if (IS_ERR(handle)) {
+				status = PTR_ERR(handle);
+				mlog_errno(status);
+				goto out_put_dquot;
+			}
+			mutex_lock(&sb_dqopt(sb)->dqio_mutex);
+			spin_lock(&dq_data_lock);
+			/* Add usage from quota entry into quota changes
+			 * of our node. Auxiliary variables are important
+			 * due to signedness */
+			spacechange = le64_to_cpu(dqblk->dqb_spacemod);
+			inodechange = le64_to_cpu(dqblk->dqb_inodemod);
+			dquot->dq_dqb.dqb_curspace += spacechange;
+			dquot->dq_dqb.dqb_curinodes += inodechange;
+			spin_unlock(&dq_data_lock);
+			/* We want to drop reference held by the crashed
+			 * node. Since we have our own reference we know
+			 * global structure actually won't be freed. */
+			status = ocfs2_global_release_dquot(dquot);
+			if (status < 0) {
+				mlog_errno(status);
+				goto out_commit;
+			}
+			/* Release local quota file entry */
+			status = ocfs2_journal_access(handle, lqinode,
+					qbh, OCFS2_JOURNAL_ACCESS_WRITE);
+			if (status < 0) {
+				mlog_errno(status);
+				goto out_commit;
+			}
+			lock_buffer(qbh);
+			WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
+			ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
+			le32_add_cpu(&dchunk->dqc_free, 1);
+			unlock_buffer(qbh);
+			status = ocfs2_journal_dirty(handle, qbh);
+			if (status < 0)
+				mlog_errno(status);
+out_commit:
+			mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
+			ocfs2_commit_trans(OCFS2_SB(sb), handle);
+out_put_dquot:
+			dqput(dquot);
+out_put_bh:
+			brelse(qbh);
+			if (status < 0)
+				break;
+		}
+		brelse(hbh);
+		list_del(&rchunk->rc_list);
+		kfree(rchunk->rc_bitmap);
+		kfree(rchunk);
+		if (status < 0)
+			break;
+	}
+	ocfs2_unlock_global_qf(oinfo, 1);
+out:
+	if (status < 0)
+		free_recovery_list(&(rec->r_list[type]));
+	mlog_exit(status);
+	return status;
+}
+
+/* Recover local quota files for given node different from us */
+int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
+				struct ocfs2_quota_recovery *rec,
+				int slot_num)
+{
+	unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
+					LOCAL_GROUP_QUOTA_SYSTEM_INODE };
+	struct super_block *sb = osb->sb;
+	struct ocfs2_local_disk_dqinfo *ldinfo;
+	struct buffer_head *bh;
+	handle_t *handle;
+	int type;
+	int status = 0;
+	struct inode *lqinode;
+	unsigned int flags;
+
+	mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
+	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+	for (type = 0; type < MAXQUOTAS; type++) {
+		if (list_empty(&(rec->r_list[type])))
+			continue;
+		mlog(0, "Recovering quota in slot %d\n", slot_num);
+		lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
+		if (!lqinode) {
+			status = -ENOENT;
+			goto out;
+		}
+		status = ocfs2_inode_lock_full(lqinode, NULL, 1,
+						       OCFS2_META_LOCK_NOQUEUE);
+		/* Someone else is holding the lock? Then he must be
+		 * doing the recovery. Just skip the file... */
+		if (status == -EAGAIN) {
+			mlog(ML_NOTICE, "skipping quota recovery for slot %d "
+			     "because quota file is locked.\n", slot_num);
+			status = 0;
+			goto out_put;
+		} else if (status < 0) {
+			mlog_errno(status);
+			goto out_put;
+		}
+		/* Now read local header */
+		bh = ocfs2_read_quota_block(lqinode, 0, &status);
+		if (!bh) {
+			mlog_errno(status);
+			mlog(ML_ERROR, "failed to read quota file info header "
+				"(slot=%d type=%d)\n", slot_num, type);
+			goto out_lock;
+		}
+		ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
+							OCFS2_LOCAL_INFO_OFF);
+		/* Is recovery still needed? */
+		flags = le32_to_cpu(ldinfo->dqi_flags);
+		if (!(flags & OLQF_CLEAN))
+			status = ocfs2_recover_local_quota_file(lqinode,
+								type,
+								rec);
+		/* We don't want to mark file as clean when it is actually
+		 * active */
+		if (slot_num == osb->slot_num)
+			goto out_bh;
+		/* Mark quota file as clean if we are recovering quota file of
+		 * some other node. */
+		handle = ocfs2_start_trans(osb, 1);
+		if (IS_ERR(handle)) {
+			status = PTR_ERR(handle);
+			mlog_errno(status);
+			goto out_bh;
+		}
+		status = ocfs2_journal_access(handle, lqinode, bh,
+					      OCFS2_JOURNAL_ACCESS_WRITE);
+		if (status < 0) {
+			mlog_errno(status);
+			goto out_trans;
+		}
+		lock_buffer(bh);
+		ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
+		unlock_buffer(bh);
+		status = ocfs2_journal_dirty(handle, bh);
+		if (status < 0)
+			mlog_errno(status);
+out_trans:
+		ocfs2_commit_trans(osb, handle);
+out_bh:
+		brelse(bh);
+out_lock:
+		ocfs2_inode_unlock(lqinode, 1);
+out_put:
+		iput(lqinode);
+		if (status < 0)
+			break;
+	}
+out:
+	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+	kfree(rec);
+	return status;
+}
+
 /* Read information header from quota file */
 static int ocfs2_local_read_info(struct super_block *sb, int type)
 {
@@ -262,6 +651,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 	struct inode *lqinode = sb_dqopt(sb)->files[type];
 	int status;
 	struct buffer_head *bh = NULL;
+	struct ocfs2_quota_recovery *rec;
 	int locked = 0;
 
 	info->dqi_maxblimit = 0x7fffffffffffffffLL;
@@ -275,6 +665,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 	info->dqi_priv = oinfo;
 	oinfo->dqi_type = type;
 	INIT_LIST_HEAD(&oinfo->dqi_chunk);
+	oinfo->dqi_rec = NULL;
 	oinfo->dqi_lqi_bh = NULL;
 	oinfo->dqi_ibh = NULL;
 
@@ -305,10 +696,27 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 	oinfo->dqi_ibh = bh;
 
 	/* We crashed when using local quota file? */
-	if (!(info->dqi_flags & OLQF_CLEAN))
-		goto out_err;	/* So far we just bail out. Later we should resync here */
+	if (!(info->dqi_flags & OLQF_CLEAN)) {
+		rec = OCFS2_SB(sb)->quota_rec;
+		if (!rec) {
+			rec = ocfs2_alloc_quota_recovery();
+			if (!rec) {
+				status = -ENOMEM;
+				mlog_errno(status);
+				goto out_err;
+			}
+			OCFS2_SB(sb)->quota_rec = rec;
+		}
 
-	status = ocfs2_load_local_quota_bitmaps(sb_dqopt(sb)->files[type],
+		status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
+                                                   &rec->r_list[type]);
+		if (status < 0) {
+			mlog_errno(status);
+			goto out_err;
+		}
+	}
+
+	status = ocfs2_load_local_quota_bitmaps(lqinode,
 						ldinfo,
 						&oinfo->dqi_chunk);
 	if (status < 0) {
@@ -394,6 +802,12 @@ static int ocfs2_local_free_info(struct super_block *sb, int type)
 	}
 	ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 
+	/* dqonoff_mutex protects us against racing with recovery thread... */
+	if (oinfo->dqi_rec) {
+		ocfs2_free_quota_recovery(oinfo->dqi_rec);
+		mark_clean = 0;
+	}
+
 	if (!mark_clean)
 		goto out;
 
-- 
1.5.2.4