zonefs: Separate zone information from inode information

In preparation for adding dynamic inode allocation, separate an inode
zone information from the zonefs inode structure. The new data structure
zonefs_zone is introduced to store in memory information about a zone
that must be kept throughout the lifetime of the device mount.

Linking between a zone file inode and its zone information is done by
setting the inode i_private field to point to a struct zonefs_zone.
Using the i_private pointer avoids the need for adding a pointer in
struct zonefs_inode_info. Beside the vfs inode, this structure is
reduced to a mutex and a write open counter.

One struct zonefs_zone is created per file inode on mount. These
structures are organized in an array using the new struct
zonefs_zone_group data structure to represent zone groups. The
zonefs_zone arrays are indexed per file number (the index of a struct
zonefs_zone in its array directly gives the file number/name for that
zone file inode).

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>

4 files changed, 449 insertions, 304 deletions

diff --git a/fs/zonefs/file.c b/fs/zonefs/file.c
index 64873d31d75d..738b0e28d74b 100644
--- a/fs/zonefs/file.c
+++ b/fs/zonefs/file.c
@@ -29,6 +29,7 @@ static int zonefs_read_iomap_begin(struct inode *inode, loff_t offset,
 				   struct iomap *iomap, struct iomap *srcmap)
 {
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	loff_t isize;
 
@@ -46,7 +47,7 @@ static int zonefs_read_iomap_begin(struct inode *inode, loff_t offset,
 		iomap->length = length;
 	} else {
 		iomap->type = IOMAP_MAPPED;
-		iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
+		iomap->addr = (z->z_sector << SECTOR_SHIFT) + iomap->offset;
 		iomap->length = isize - iomap->offset;
 	}
 	mutex_unlock(&zi->i_truncate_mutex);
@@ -65,11 +66,12 @@ static int zonefs_write_iomap_begin(struct inode *inode, loff_t offset,
 				    struct iomap *iomap, struct iomap *srcmap)
 {
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	loff_t isize;
 
 	/* All write I/Os should always be within the file maximum size */
-	if (WARN_ON_ONCE(offset + length > zi->i_max_size))
+	if (WARN_ON_ONCE(offset + length > z->z_capacity))
 		return -EIO;
 
 	/*
@@ -77,7 +79,7 @@ static int zonefs_write_iomap_begin(struct inode *inode, loff_t offset,
 	 * checked when writes are issued, so warn if we see a page writeback
 	 * operation.
 	 */
-	if (WARN_ON_ONCE(zonefs_zone_is_seq(zi) && !(flags & IOMAP_DIRECT)))
+	if (WARN_ON_ONCE(zonefs_zone_is_seq(z) && !(flags & IOMAP_DIRECT)))
 		return -EIO;
 
 	/*
@@ -88,11 +90,11 @@ static int zonefs_write_iomap_begin(struct inode *inode, loff_t offset,
 	mutex_lock(&zi->i_truncate_mutex);
 	iomap->bdev = inode->i_sb->s_bdev;
 	iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
-	iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
+	iomap->addr = (z->z_sector << SECTOR_SHIFT) + iomap->offset;
 	isize = i_size_read(inode);
 	if (iomap->offset >= isize) {
 		iomap->type = IOMAP_UNWRITTEN;
-		iomap->length = zi->i_max_size - iomap->offset;
+		iomap->length = z->z_capacity - iomap->offset;
 	} else {
 		iomap->type = IOMAP_MAPPED;
 		iomap->length = isize - iomap->offset;
@@ -125,9 +127,9 @@ static void zonefs_readahead(struct readahead_control *rac)
 static int zonefs_write_map_blocks(struct iomap_writepage_ctx *wpc,
 				   struct inode *inode, loff_t offset)
 {
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 
-	if (WARN_ON_ONCE(zonefs_zone_is_seq(zi)))
+	if (WARN_ON_ONCE(zonefs_zone_is_seq(z)))
 		return -EIO;
 	if (WARN_ON_ONCE(offset >= i_size_read(inode)))
 		return -EIO;
@@ -137,7 +139,8 @@ static int zonefs_write_map_blocks(struct iomap_writepage_ctx *wpc,
 	    offset < wpc->iomap.offset + wpc->iomap.length)
 		return 0;
 
-	return zonefs_write_iomap_begin(inode, offset, zi->i_max_size - offset,
+	return zonefs_write_iomap_begin(inode, offset,
+					z->z_capacity - offset,
 					IOMAP_WRITE, &wpc->iomap, NULL);
 }
 
@@ -185,6 +188,7 @@ const struct address_space_operations zonefs_file_aops = {
 int zonefs_file_truncate(struct inode *inode, loff_t isize)
 {
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	loff_t old_isize;
 	enum req_op op;
 	int ret = 0;
@@ -194,12 +198,12 @@ int zonefs_file_truncate(struct inode *inode, loff_t isize)
 	 * only down to a 0 size, which is equivalent to a zone reset, and to
 	 * the maximum file size, which is equivalent to a zone finish.
 	 */
-	if (!zonefs_zone_is_seq(zi))
+	if (!zonefs_zone_is_seq(z))
 		return -EPERM;
 
 	if (!isize)
 		op = REQ_OP_ZONE_RESET;
-	else if (isize == zi->i_max_size)
+	else if (isize == z->z_capacity)
 		op = REQ_OP_ZONE_FINISH;
 	else
 		return -EPERM;
@@ -216,7 +220,7 @@ int zonefs_file_truncate(struct inode *inode, loff_t isize)
 	if (isize == old_isize)
 		goto unlock;
 
-	ret = zonefs_zone_mgmt(inode, op);
+	ret = zonefs_inode_zone_mgmt(inode, op);
 	if (ret)
 		goto unlock;
 
@@ -224,7 +228,7 @@ int zonefs_file_truncate(struct inode *inode, loff_t isize)
 	 * If the mount option ZONEFS_MNTOPT_EXPLICIT_OPEN is set,
 	 * take care of open zones.
 	 */
-	if (zi->i_flags & ZONEFS_ZONE_OPEN) {
+	if (z->z_flags & ZONEFS_ZONE_OPEN) {
 		/*
 		 * Truncating a zone to EMPTY or FULL is the equivalent of
 		 * closing the zone. For a truncation to 0, we need to
@@ -234,15 +238,15 @@ int zonefs_file_truncate(struct inode *inode, loff_t isize)
 		 * the open flag.
 		 */
 		if (!isize)
-			ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
+			ret = zonefs_inode_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
 		else
-			zi->i_flags &= ~ZONEFS_ZONE_OPEN;
+			z->z_flags &= ~ZONEFS_ZONE_OPEN;
 	}
 
 	zonefs_update_stats(inode, isize);
 	truncate_setsize(inode, isize);
-	zi->i_wpoffset = isize;
-	zonefs_account_active(inode);
+	z->z_wpoffset = isize;
+	zonefs_inode_account_active(inode);
 
 unlock:
 	mutex_unlock(&zi->i_truncate_mutex);
@@ -349,7 +353,7 @@ static int zonefs_file_write_dio_end_io(struct kiocb *iocb, ssize_t size,
 		return error;
 	}
 
-	if (size && zonefs_zone_is_seq(zi)) {
+	if (size && zonefs_inode_is_seq(inode)) {
 		/*
 		 * Note that we may be seeing completions out of order,
 		 * but that is not a problem since a write completed
@@ -375,7 +379,7 @@ static const struct iomap_dio_ops zonefs_write_dio_ops = {
 static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct inode *inode = file_inode(iocb->ki_filp);
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct block_device *bdev = inode->i_sb->s_bdev;
 	unsigned int max = bdev_max_zone_append_sectors(bdev);
 	struct bio *bio;
@@ -392,7 +396,7 @@ static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
 
 	bio = bio_alloc(bdev, nr_pages,
 			REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE, GFP_NOFS);
-	bio->bi_iter.bi_sector = zi->i_zsector;
+	bio->bi_iter.bi_sector = z->z_sector;
 	bio->bi_ioprio = iocb->ki_ioprio;
 	if (iocb_is_dsync(iocb))
 		bio->bi_opf |= REQ_FUA;
@@ -417,12 +421,12 @@ static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
 	 */
 	if (!ret) {
 		sector_t wpsector =
-			zi->i_zsector + (zi->i_wpoffset >> SECTOR_SHIFT);
+			z->z_sector + (z->z_wpoffset >> SECTOR_SHIFT);
 
 		if (bio->bi_iter.bi_sector != wpsector) {
 			zonefs_warn(inode->i_sb,
 				"Corrupted write pointer %llu for zone at %llu\n",
-				wpsector, zi->i_zsector);
+				wpsector, z->z_sector);
 			ret = -EIO;
 		}
 	}
@@ -450,9 +454,9 @@ static loff_t zonefs_write_check_limits(struct file *file, loff_t pos,
 					loff_t count)
 {
 	struct inode *inode = file_inode(file);
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	loff_t limit = rlimit(RLIMIT_FSIZE);
-	loff_t max_size = zi->i_max_size;
+	loff_t max_size = z->z_capacity;
 
 	if (limit != RLIM_INFINITY) {
 		if (pos >= limit) {
@@ -476,6 +480,7 @@ static ssize_t zonefs_write_checks(struct kiocb *iocb, struct iov_iter *from)
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	loff_t count;
 
 	if (IS_SWAPFILE(inode))
@@ -488,10 +493,10 @@ static ssize_t zonefs_write_checks(struct kiocb *iocb, struct iov_iter *from)
 		return -EINVAL;
 
 	if (iocb->ki_flags & IOCB_APPEND) {
-		if (zonefs_zone_is_cnv(zi))
+		if (zonefs_zone_is_cnv(z))
 			return -EINVAL;
 		mutex_lock(&zi->i_truncate_mutex);
-		iocb->ki_pos = zi->i_wpoffset;
+		iocb->ki_pos = z->z_wpoffset;
 		mutex_unlock(&zi->i_truncate_mutex);
 	}
 
@@ -518,6 +523,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct inode *inode = file_inode(iocb->ki_filp);
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	bool sync = is_sync_kiocb(iocb);
 	bool append = false;
@@ -528,7 +534,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
 	 * as this can cause write reordering (e.g. the first aio gets EAGAIN
 	 * on the inode lock but the second goes through but is now unaligned).
 	 */
-	if (zonefs_zone_is_seq(zi) && !sync && (iocb->ki_flags & IOCB_NOWAIT))
+	if (zonefs_zone_is_seq(z) && !sync && (iocb->ki_flags & IOCB_NOWAIT))
 		return -EOPNOTSUPP;
 
 	if (iocb->ki_flags & IOCB_NOWAIT) {
@@ -550,9 +556,9 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
 	}
 
 	/* Enforce sequential writes (append only) in sequential zones */
-	if (zonefs_zone_is_seq(zi)) {
+	if (zonefs_zone_is_seq(z)) {
 		mutex_lock(&zi->i_truncate_mutex);
-		if (iocb->ki_pos != zi->i_wpoffset) {
+		if (iocb->ki_pos != z->z_wpoffset) {
 			mutex_unlock(&zi->i_truncate_mutex);
 			ret = -EINVAL;
 			goto inode_unlock;
@@ -566,7 +572,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
 	else
 		ret = iomap_dio_rw(iocb, from, &zonefs_write_iomap_ops,
 				   &zonefs_write_dio_ops, 0, NULL, 0);
-	if (zonefs_zone_is_seq(zi) &&
+	if (zonefs_zone_is_seq(z) &&
 	    (ret > 0 || ret == -EIOCBQUEUED)) {
 		if (ret > 0)
 			count = ret;
@@ -577,8 +583,8 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
 		 * will correct it. Also do active seq file accounting.
 		 */
 		mutex_lock(&zi->i_truncate_mutex);
-		zi->i_wpoffset += count;
-		zonefs_account_active(inode);
+		z->z_wpoffset += count;
+		zonefs_inode_account_active(inode);
 		mutex_unlock(&zi->i_truncate_mutex);
 	}
 
@@ -629,6 +635,7 @@ inode_unlock:
 static ssize_t zonefs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct inode *inode = file_inode(iocb->ki_filp);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 
 	if (unlikely(IS_IMMUTABLE(inode)))
 		return -EPERM;
@@ -636,8 +643,8 @@ static ssize_t zonefs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	if (sb_rdonly(inode->i_sb))
 		return -EROFS;
 
-	/* Write operations beyond the zone size are not allowed */
-	if (iocb->ki_pos >= ZONEFS_I(inode)->i_max_size)
+	/* Write operations beyond the zone capacity are not allowed */
+	if (iocb->ki_pos >= z->z_capacity)
 		return -EFBIG;
 
 	if (iocb->ki_flags & IOCB_DIRECT) {
@@ -669,6 +676,7 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
 	struct inode *inode = file_inode(iocb->ki_filp);
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	loff_t isize;
 	ssize_t ret;
@@ -677,7 +685,7 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 	if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777)))
 		return -EPERM;
 
-	if (iocb->ki_pos >= zi->i_max_size)
+	if (iocb->ki_pos >= z->z_capacity)
 		return 0;
 
 	if (iocb->ki_flags & IOCB_NOWAIT) {
@@ -738,6 +746,7 @@ static inline bool zonefs_seq_file_need_wro(struct inode *inode,
 static int zonefs_seq_file_write_open(struct inode *inode)
 {
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	int ret = 0;
 
 	mutex_lock(&zi->i_truncate_mutex);
@@ -755,14 +764,15 @@ static int zonefs_seq_file_write_open(struct inode *inode)
 				goto unlock;
 			}
 
-			if (i_size_read(inode) < zi->i_max_size) {
-				ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
+			if (i_size_read(inode) < z->z_capacity) {
+				ret = zonefs_inode_zone_mgmt(inode,
+							     REQ_OP_ZONE_OPEN);
 				if (ret) {
 					atomic_dec(&sbi->s_wro_seq_files);
 					goto unlock;
 				}
-				zi->i_flags |= ZONEFS_ZONE_OPEN;
-				zonefs_account_active(inode);
+				z->z_flags |= ZONEFS_ZONE_OPEN;
+				zonefs_inode_account_active(inode);
 			}
 		}
 	}
@@ -792,6 +802,7 @@ static int zonefs_file_open(struct inode *inode, struct file *file)
 static void zonefs_seq_file_write_close(struct inode *inode)
 {
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
 	int ret = 0;
@@ -807,8 +818,8 @@ static void zonefs_seq_file_write_close(struct inode *inode)
 	 * its maximum size or it was fully written). For this case, we only
 	 * need to decrement the write open count.
 	 */
-	if (zi->i_flags & ZONEFS_ZONE_OPEN) {
-		ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_CLOSE);
+	if (z->z_flags & ZONEFS_ZONE_OPEN) {
+		ret = zonefs_inode_zone_mgmt(inode, REQ_OP_ZONE_CLOSE);
 		if (ret) {
 			__zonefs_io_error(inode, false);
 			/*
@@ -817,11 +828,11 @@ static void zonefs_seq_file_write_close(struct inode *inode)
 			 * exhausted). So take preventive action by remounting
 			 * read-only.
 			 */
-			if (zi->i_flags & ZONEFS_ZONE_OPEN &&
+			if (z->z_flags & ZONEFS_ZONE_OPEN &&
 			    !(sb->s_flags & SB_RDONLY)) {
 				zonefs_warn(sb,
 					"closing zone at %llu failed %d\n",
-					zi->i_zsector, ret);
+					z->z_sector, ret);
 				zonefs_warn(sb,
 					"remounting filesystem read-only\n");
 				sb->s_flags |= SB_RDONLY;
@@ -829,8 +840,8 @@ static void zonefs_seq_file_write_close(struct inode *inode)
 			goto unlock;
 		}
 
-		zi->i_flags &= ~ZONEFS_ZONE_OPEN;
-		zonefs_account_active(inode);
+		z->z_flags &= ~ZONEFS_ZONE_OPEN;
+		zonefs_inode_account_active(inode);
 	}
 
 	atomic_dec(&sbi->s_wro_seq_files);
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index a4af29dc32e7..270ded209dde 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -28,33 +28,47 @@
 #include "trace.h"
 
 /*
- * Manage the active zone count. Called with zi->i_truncate_mutex held.
+ * Get the name of a zone group directory.
  */
-void zonefs_account_active(struct inode *inode)
+static const char *zonefs_zgroup_name(enum zonefs_ztype ztype)
 {
-	struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	switch (ztype) {
+	case ZONEFS_ZTYPE_CNV:
+		return "cnv";
+	case ZONEFS_ZTYPE_SEQ:
+		return "seq";
+	default:
+		WARN_ON_ONCE(1);
+		return "???";
+	}
+}
 
-	lockdep_assert_held(&zi->i_truncate_mutex);
+/*
+ * Manage the active zone count.
+ */
+static void zonefs_account_active(struct super_block *sb,
+				  struct zonefs_zone *z)
+{
+	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
 
-	if (zonefs_zone_is_cnv(zi))
+	if (zonefs_zone_is_cnv(z))
 		return;
 
 	/*
 	 * For zones that transitioned to the offline or readonly condition,
 	 * we only need to clear the active state.
 	 */
-	if (zi->i_flags & (ZONEFS_ZONE_OFFLINE | ZONEFS_ZONE_READONLY))
+	if (z->z_flags & (ZONEFS_ZONE_OFFLINE | ZONEFS_ZONE_READONLY))
 		goto out;
 
 	/*
 	 * If the zone is active, that is, if it is explicitly open or
 	 * partially written, check if it was already accounted as active.
 	 */
-	if ((zi->i_flags & ZONEFS_ZONE_OPEN) ||
-	    (zi->i_wpoffset > 0 && zi->i_wpoffset < zi->i_max_size)) {
-		if (!(zi->i_flags & ZONEFS_ZONE_ACTIVE)) {
-			zi->i_flags |= ZONEFS_ZONE_ACTIVE;
+	if ((z->z_flags & ZONEFS_ZONE_OPEN) ||
+	    (z->z_wpoffset > 0 && z->z_wpoffset < z->z_capacity)) {
+		if (!(z->z_flags & ZONEFS_ZONE_ACTIVE)) {
+			z->z_flags |= ZONEFS_ZONE_ACTIVE;
 			atomic_inc(&sbi->s_active_seq_files);
 		}
 		return;
@@ -62,18 +76,29 @@ void zonefs_account_active(struct inode *inode)
 
 out:
 	/* The zone is not active. If it was, update the active count */
-	if (zi->i_flags & ZONEFS_ZONE_ACTIVE) {
-		zi->i_flags &= ~ZONEFS_ZONE_ACTIVE;
+	if (z->z_flags & ZONEFS_ZONE_ACTIVE) {
+		z->z_flags &= ~ZONEFS_ZONE_ACTIVE;
 		atomic_dec(&sbi->s_active_seq_files);
 	}
 }
 
-int zonefs_zone_mgmt(struct inode *inode, enum req_op op)
+/*
+ * Manage the active zone count. Called with zi->i_truncate_mutex held.
+ */
+void zonefs_inode_account_active(struct inode *inode)
 {
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
-	int ret;
+	lockdep_assert_held(&ZONEFS_I(inode)->i_truncate_mutex);
 
-	lockdep_assert_held(&zi->i_truncate_mutex);
+	return zonefs_account_active(inode->i_sb, zonefs_inode_zone(inode));
+}
+
+/*
+ * Execute a zone management operation.
+ */
+static int zonefs_zone_mgmt(struct super_block *sb,
+			    struct zonefs_zone *z, enum req_op op)
+{
+	int ret;
 
 	/*
 	 * With ZNS drives, closing an explicitly open zone that has not been
@@ -83,37 +108,45 @@ int zonefs_zone_mgmt(struct inode *inode, enum req_op op)
 	 * are exceeded, make sure that the zone does not remain active by
 	 * resetting it.
 	 */
-	if (op == REQ_OP_ZONE_CLOSE && !zi->i_wpoffset)
+	if (op == REQ_OP_ZONE_CLOSE && !z->z_wpoffset)
 		op = REQ_OP_ZONE_RESET;
 
-	trace_zonefs_zone_mgmt(inode, op);
-	ret = blkdev_zone_mgmt(inode->i_sb->s_bdev, op, zi->i_zsector,
-			       zi->i_zone_size >> SECTOR_SHIFT, GFP_NOFS);
+	trace_zonefs_zone_mgmt(sb, z, op);
+	ret = blkdev_zone_mgmt(sb->s_bdev, op, z->z_sector,
+			       z->z_size >> SECTOR_SHIFT, GFP_NOFS);
 	if (ret) {
-		zonefs_err(inode->i_sb,
+		zonefs_err(sb,
 			   "Zone management operation %s at %llu failed %d\n",
-			   blk_op_str(op), zi->i_zsector, ret);
+			   blk_op_str(op), z->z_sector, ret);
 		return ret;
 	}
 
 	return 0;
 }
 
+int zonefs_inode_zone_mgmt(struct inode *inode, enum req_op op)
+{
+	lockdep_assert_held(&ZONEFS_I(inode)->i_truncate_mutex);
+
+	return zonefs_zone_mgmt(inode->i_sb, zonefs_inode_zone(inode), op);
+}
+
 void zonefs_i_size_write(struct inode *inode, loff_t isize)
 {
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 
 	i_size_write(inode, isize);
+
 	/*
 	 * A full zone is no longer open/active and does not need
 	 * explicit closing.
 	 */
-	if (isize >= zi->i_max_size) {
+	if (isize >= z->z_capacity) {
 		struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
 
-		if (zi->i_flags & ZONEFS_ZONE_ACTIVE)
+		if (z->z_flags & ZONEFS_ZONE_ACTIVE)
 			atomic_dec(&sbi->s_active_seq_files);
-		zi->i_flags &= ~(ZONEFS_ZONE_OPEN | ZONEFS_ZONE_ACTIVE);
+		z->z_flags &= ~(ZONEFS_ZONE_OPEN | ZONEFS_ZONE_ACTIVE);
 	}
 }
 
@@ -150,20 +183,18 @@ void zonefs_update_stats(struct inode *inode, loff_t new_isize)
 }
 
 /*
- * Check a zone condition and adjust its file inode access permissions for
- * offline and readonly zones. Return the inode size corresponding to the
- * amount of readable data in the zone.
+ * Check a zone condition. Return the amount of written (and still readable)
+ * data in the zone.
  */
-static loff_t zonefs_check_zone_condition(struct inode *inode,
+static loff_t zonefs_check_zone_condition(struct super_block *sb,
+					  struct zonefs_zone *z,
 					  struct blk_zone *zone)
 {
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
-
 	switch (zone->cond) {
 	case BLK_ZONE_COND_OFFLINE:
-		zonefs_warn(inode->i_sb, "inode %lu: offline zone\n",
-			    inode->i_ino);
-		zi->i_flags |= ZONEFS_ZONE_OFFLINE;
+		zonefs_warn(sb, "Zone %llu: offline zone\n",
+			    z->z_sector);
+		z->z_flags |= ZONEFS_ZONE_OFFLINE;
 		return 0;
 	case BLK_ZONE_COND_READONLY:
 		/*
@@ -174,18 +205,18 @@ static loff_t zonefs_check_zone_condition(struct inode *inode,
 		 * the inode size as it was when last updated so that the user
 		 * can recover data.
 		 */
-		zonefs_warn(inode->i_sb, "inode %lu: read-only zone\n",
-			    inode->i_ino);
-		zi->i_flags |= ZONEFS_ZONE_READONLY;
-		if (zonefs_zone_is_cnv(zi))
-			return zi->i_max_size;
-		return zi->i_wpoffset;
+		zonefs_warn(sb, "Zone %llu: read-only zone\n",
+			    z->z_sector);
+		z->z_flags |= ZONEFS_ZONE_READONLY;
+		if (zonefs_zone_is_cnv(z))
+			return z->z_capacity;
+		return z->z_wpoffset;
 	case BLK_ZONE_COND_FULL:
 		/* The write pointer of full zones is invalid. */
-		return zi->i_max_size;
+		return z->z_capacity;
 	default:
-		if (zonefs_zone_is_cnv(zi))
-			return zi->i_max_size;
+		if (zonefs_zone_is_cnv(z))
+			return z->z_capacity;
 		return (zone->wp - zone->start) << SECTOR_SHIFT;
 	}
 }
@@ -196,22 +227,22 @@ static loff_t zonefs_check_zone_condition(struct inode *inode,
  */
 static void zonefs_inode_update_mode(struct inode *inode)
 {
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 
-	if (zi->i_flags & ZONEFS_ZONE_OFFLINE) {
+	if (z->z_flags & ZONEFS_ZONE_OFFLINE) {
 		/* Offline zones cannot be read nor written */
 		inode->i_flags |= S_IMMUTABLE;
 		inode->i_mode &= ~0777;
-	} else if (zi->i_flags & ZONEFS_ZONE_READONLY) {
+	} else if (z->z_flags & ZONEFS_ZONE_READONLY) {
 		/* Readonly zones cannot be written */
 		inode->i_flags |= S_IMMUTABLE;
-		if (zi->i_flags & ZONEFS_ZONE_INIT_MODE)
+		if (z->z_flags & ZONEFS_ZONE_INIT_MODE)
 			inode->i_mode &= ~0777;
 		else
 			inode->i_mode &= ~0222;
 	}
 
-	zi->i_flags &= ~ZONEFS_ZONE_INIT_MODE;
+	z->z_flags &= ~ZONEFS_ZONE_INIT_MODE;
 }
 
 struct zonefs_ioerr_data {
@@ -224,7 +255,7 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 {
 	struct zonefs_ioerr_data *err = data;
 	struct inode *inode = err->inode;
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
 	loff_t isize, data_size;
@@ -235,9 +266,9 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 	 * as there is no inconsistency between the inode size and the amount of
 	 * data writen in the zone (data_size).
 	 */
-	data_size = zonefs_check_zone_condition(inode, zone);
+	data_size = zonefs_check_zone_condition(sb, z, zone);
 	isize = i_size_read(inode);
-	if (!(zi->i_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)) &&
+	if (!(z->z_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)) &&
 	    !err->write && isize == data_size)
 		return 0;
 
@@ -260,8 +291,9 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 	 * In all cases, warn about inode size inconsistency and handle the
 	 * IO error according to the zone condition and to the mount options.
 	 */
-	if (zonefs_zone_is_seq(zi) && isize != data_size)
-		zonefs_warn(sb, "inode %lu: invalid size %lld (should be %lld)\n",
+	if (zonefs_zone_is_seq(z) && isize != data_size)
+		zonefs_warn(sb,
+			    "inode %lu: invalid size %lld (should be %lld)\n",
 			    inode->i_ino, isize, data_size);
 
 	/*
@@ -270,20 +302,20 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 	 * zone condition to read-only and offline respectively, as if the
 	 * condition was signaled by the hardware.
 	 */
-	if ((zi->i_flags & ZONEFS_ZONE_OFFLINE) ||
+	if ((z->z_flags & ZONEFS_ZONE_OFFLINE) ||
 	    (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL)) {
 		zonefs_warn(sb, "inode %lu: read/write access disabled\n",
 			    inode->i_ino);
-		if (!(zi->i_flags & ZONEFS_ZONE_OFFLINE))
-			zi->i_flags |= ZONEFS_ZONE_OFFLINE;
+		if (!(z->z_flags & ZONEFS_ZONE_OFFLINE))
+			z->z_flags |= ZONEFS_ZONE_OFFLINE;
 		zonefs_inode_update_mode(inode);
 		data_size = 0;
-	} else if ((zi->i_flags & ZONEFS_ZONE_READONLY) ||
+	} else if ((z->z_flags & ZONEFS_ZONE_READONLY) ||
 		   (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO)) {
 		zonefs_warn(sb, "inode %lu: write access disabled\n",
 			    inode->i_ino);
-		if (!(zi->i_flags & ZONEFS_ZONE_READONLY))
-			zi->i_flags |= ZONEFS_ZONE_READONLY;
+		if (!(z->z_flags & ZONEFS_ZONE_READONLY))
+			z->z_flags |= ZONEFS_ZONE_READONLY;
 		zonefs_inode_update_mode(inode);
 		data_size = isize;
 	} else if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO &&
@@ -299,8 +331,8 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 	 * close of the zone when the inode file is closed.
 	 */
 	if ((sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) &&
-	    (zi->i_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)))
-		zi->i_flags &= ~ZONEFS_ZONE_OPEN;
+	    (z->z_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)))
+		z->z_flags &= ~ZONEFS_ZONE_OPEN;
 
 	/*
 	 * If error=remount-ro was specified, any error result in remounting
@@ -317,8 +349,8 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
 	 */
 	zonefs_update_stats(inode, data_size);
 	zonefs_i_size_write(inode, data_size);
-	zi->i_wpoffset = data_size;
-	zonefs_account_active(inode);
+	z->z_wpoffset = data_size;
+	zonefs_inode_account_active(inode);
 
 	return 0;
 }
@@ -332,7 +364,7 @@ static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
  */
 void __zonefs_io_error(struct inode *inode, bool write)
 {
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
+	struct zonefs_zone *z = zonefs_inode_zone(inode);
 	struct super_block *sb = inode->i_sb;
 	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
 	unsigned int noio_flag;
@@ -348,8 +380,8 @@ void __zonefs_io_error(struct inode *inode, bool write)
 	 * files with aggregated conventional zones, for which the inode zone
 	 * size is always larger than the device zone size.
 	 */
-	if (zi->i_zone_size > bdev_zone_sectors(sb->s_bdev))
-		nr_zones = zi->i_zone_size >>
+	if (z->z_size > bdev_zone_sectors(sb->s_bdev))
+		nr_zones = z->z_size >>
 			(sbi->s_zone_sectors_shift + SECTOR_SHIFT);
 
 	/*
@@ -361,7 +393,7 @@ void __zonefs_io_error(struct inode *inode, bool write)
 	 * the GFP_NOIO context avoids both problems.
 	 */
 	noio_flag = memalloc_noio_save();
-	ret = blkdev_report_zones(sb->s_bdev, zi->i_zsector, nr_zones,
+	ret = blkdev_report_zones(sb->s_bdev, z->z_sector, nr_zones,
 				  zonefs_io_error_cb, &err);
 	if (ret != nr_zones)
 		zonefs_err(sb, "Get inode %lu zone information failed %d\n",
@@ -381,9 +413,7 @@ static struct inode *zonefs_alloc_inode(struct super_block *sb)
 
 	inode_init_once(&zi->i_vnode);
 	mutex_init(&zi->i_truncate_mutex);
-	zi->i_wpoffset = 0;
 	zi->i_wr_refcnt = 0;
-	zi->i_flags = 0;
 
 	return &zi->i_vnode;
 }
@@ -416,8 +446,8 @@ static int zonefs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_bavail = buf->f_bfree;
 
 	for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) {
-		if (sbi->s_nr_files[t])
-			buf->f_files += sbi->s_nr_files[t] + 1;
+		if (sbi->s_zgroup[t].g_nr_zones)
+			buf->f_files += sbi->s_zgroup[t].g_nr_zones + 1;
 	}
 	buf->f_ffree = 0;
 
@@ -557,11 +587,11 @@ static const struct inode_operations zonefs_dir_inode_operations = {
 };
 
 static void zonefs_init_dir_inode(struct inode *parent, struct inode *inode,
-				  enum zonefs_ztype type)
+				  enum zonefs_ztype ztype)
 {
 	struct super_block *sb = parent->i_sb;
 
-	inode->i_ino = bdev_nr_zones(sb->s_bdev) + type + 1;
+	inode->i_ino = bdev_nr_zones(sb->s_bdev) + ztype + 1;
 	inode_init_owner(&init_user_ns, inode, parent, S_IFDIR | 0555);
 	inode->i_op = &zonefs_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
@@ -573,79 +603,34 @@ static const struct inode_operations zonefs_file_inode_operations = {
 	.setattr	= zonefs_inode_setattr,
 };
 
-static int zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone,
-				  enum zonefs_ztype type)
+static void zonefs_init_file_inode(struct inode *inode,
+				   struct zonefs_zone *z)
 {
 	struct super_block *sb = inode->i_sb;
 	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
-	struct zonefs_inode_info *zi = ZONEFS_I(inode);
-	int ret = 0;
-
-	inode->i_ino = zone->start >> sbi->s_zone_sectors_shift;
-	inode->i_mode = S_IFREG | sbi->s_perm;
 
-	if (type == ZONEFS_ZTYPE_CNV)
-		zi->i_flags |= ZONEFS_ZONE_CNV;
-
-	zi->i_zsector = zone->start;
-	zi->i_zone_size = zone->len << SECTOR_SHIFT;
-	if (zi->i_zone_size > bdev_zone_sectors(sb->s_bdev) << SECTOR_SHIFT &&
-	    !(sbi->s_features & ZONEFS_F_AGGRCNV)) {
-		zonefs_err(sb,
-			   "zone size %llu doesn't match device's zone sectors %llu\n",
-			   zi->i_zone_size,
-			   bdev_zone_sectors(sb->s_bdev) << SECTOR_SHIFT);
-		return -EINVAL;
-	}
-
-	zi->i_max_size = min_t(loff_t, MAX_LFS_FILESIZE,
-			       zone->capacity << SECTOR_SHIFT);
-	zi->i_wpoffset = zonefs_check_zone_condition(inode, zone);
+	inode->i_private = z;
 
+	inode->i_ino = z->z_sector >> sbi->s_zone_sectors_shift;
+	inode->i_mode = S_IFREG | sbi->s_perm;
 	inode->i_uid = sbi->s_uid;
 	inode->i_gid = sbi->s_gid;
-	inode->i_size = zi->i_wpoffset;
-	inode->i_blocks = zi->i_max_size >> SECTOR_SHIFT;
+	inode->i_size = z->z_wpoffset;
+	inode->i_blocks = z->z_capacity >> SECTOR_SHIFT;
 
 	inode->i_op = &zonefs_file_inode_operations;
 	inode->i_fop = &zonefs_file_operations;
 	inode->i_mapping->a_ops = &zonefs_file_aops;
 
 	/* Update the inode access rights depending on the zone condition */
-	zi->i_flags |= ZONEFS_ZONE_INIT_MODE;
+	z->z_flags |= ZONEFS_ZONE_INIT_MODE;
 	zonefs_inode_update_mode(inode);
-
-	sb->s_maxbytes = max(zi->i_max_size, sb->s_maxbytes);
-	sbi->s_blocks += zi->i_max_size >> sb->s_blocksize_bits;
-	sbi->s_used_blocks += zi->i_wpoffset >> sb->s_blocksize_bits;
-
-	mutex_lock(&zi->i_truncate_mutex);
-
-	/*
-	 * For sequential zones, make sure that any open zone is closed first
-	 * to ensure that the initial number of open zones is 0, in sync with
-	 * the open zone accounting done when the mount option
-	 * ZONEFS_MNTOPT_EXPLICIT_OPEN is used.
-	 */
-	if (type == ZONEFS_ZTYPE_SEQ &&
-	    (zone->cond == BLK_ZONE_COND_IMP_OPEN ||
-	     zone->cond == BLK_ZONE_COND_EXP_OPEN)) {
-		ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_CLOSE);
-		if (ret)
-			goto unlock;
-	}
-
-	zonefs_account_active(inode);
-
-unlock:
-	mutex_unlock(&zi->i_truncate_mutex);
-
-	return ret;
 }
 
 static struct dentry *zonefs_create_inode(struct dentry *parent,
-					const char *name, struct blk_zone *zone,
-					enum zonefs_ztype type)
+					  const char *name,
+					  struct zonefs_zone *z,
+					  enum zonefs_ztype ztype)
 {
 	struct inode *dir = d_inode(parent);
 	struct dentry *dentry;
@@ -661,15 +646,10 @@ static struct dentry *zonefs_create_inode(struct dentry *parent,
 		goto dput;
 
 	inode->i_ctime = inode->i_mtime = inode->i_atime = dir->i_ctime;
-	if (zone) {
-		ret = zonefs_init_file_inode(inode, zone, type);
-		if (ret) {
-			iput(inode);
-			goto dput;
-		}
-	} else {
-		zonefs_init_dir_inode(dir, inode, type);
-	}
+	if (z)
+		zonefs_init_file_inode(inode, z);
+	else
+		zonefs_init_dir_inode(dir, inode, ztype);
 
 	d_add(dentry, inode);
 	dir->i_size++;
@@ -685,100 +665,51 @@ dput:
 struct zonefs_zone_data {
 	struct super_block	*sb;
 	unsigned int		nr_zones[ZONEFS_ZTYPE_MAX];
+	sector_t		cnv_zone_start;
 	struct blk_zone		*zones;
 };
 
 /*
- * Create a zone group and populate it with zone files.
+ * Create the inodes for a zone group.
  */
-static int zonefs_create_zgroup(struct zonefs_zone_data *zd,
-				enum zonefs_ztype type)
+static int zonefs_create_zgroup_inodes(struct super_block *sb,
+				       enum zonefs_ztype ztype)
 {
-	struct super_block *sb = zd->sb;
 	struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
-	struct blk_zone *zone, *next, *end;
-	const char *zgroup_name;
-	char *file_name;
+	struct zonefs_zone_group *zgroup = &sbi->s_zgroup[ztype];
 	struct dentry *dir, *dent;
-	unsigned int n = 0;
-	int ret;
+	char *file_name;
+	int i, ret = 0;
+
+	if (!zgroup)
+		return -ENOMEM;
 
 	/* If the group is empty, there is nothing to do */
-	if (!zd->nr_zones[type])
+	if (!zgroup->g_nr_zones)
 		return 0;
 
 	file_name = kmalloc(ZONEFS_NAME_MAX, GFP_KERNEL);
 	if (!file_name)
 		return -ENOMEM;
 
-	if (type == ZONEFS_ZTYPE_CNV)
-		zgroup_name = "cnv";
-	else
-		zgroup_name = "seq";
-
-	dir = zonefs_create_inode(sb->s_root, zgroup_name, NULL, type);
+	dir = zonefs_create_inode(sb->s_root, zonefs_zgroup_name(ztype),
+				  NULL, ztype);
 	if (IS_ERR(dir)) {
 		ret = PTR_ERR(dir);
 		goto free;
 	}
 
-	/*
-	 * The first zone contains the super block: skip it.
-	 */
-	end = zd->zones + bdev_nr_zones(sb->s_bdev);
-	for (zone = &zd->zones[1]; zone < end; zone = next) {
-
-		next = zone + 1;
-		if (zonefs_zone_type(zone) != type)
-			continue;
-
-		/*
-		 * For conventional zones, contiguous zones can be aggregated
-		 * together to form large