zonefs: Rename super block information fields

The s_open_zones field of struct zonefs_sb_info is used to count the
number of files that are open for writing and may not necessarilly
correspond to the number of open zones on the device. For instance, an
application may open for writing a sequential zone file, fully write it
and keep the file open. In such case, the zone of the file is not open
anymore (it is in the full state).

Avoid confusion about this counter meaning by renaming it to
s_wro_seq_files. To keep things consistent, the field s_max_open_zones
is renamed to s_max_wro_seq_files.
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>

fs/zonefs/super.c

@@ -1035,8 +1035,10 @@ static int zonefs_open_zone(struct inode *inode)
 	mutex_lock(&zi->i_truncate_mutex);
 
 	if (!zi->i_wr_refcnt) {
-		if (atomic_inc_return(&sbi->s_open_zones) > sbi->s_max_open_zones) {
-			atomic_dec(&sbi->s_open_zones);
+		unsigned int wro = atomic_inc_return(&sbi->s_wro_seq_files);
+
+		if (wro > sbi->s_max_wro_seq_files) {
+			atomic_dec(&sbi->s_wro_seq_files);
 			ret = -EBUSY;
 			goto unlock;
 		}
@@ -1044,7 +1046,7 @@ static int zonefs_open_zone(struct inode *inode)
 		if (i_size_read(inode) < zi->i_max_size) {
 			ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
 			if (ret) {
-				atomic_dec(&sbi->s_open_zones);
+				atomic_dec(&sbi->s_wro_seq_files);
 				goto unlock;
 			}
 			zi->i_flags |= ZONEFS_ZONE_OPEN;
@@ -1108,7 +1110,7 @@ static void zonefs_close_zone(struct inode *inode)
 		}
 		zi->i_flags &= ~ZONEFS_ZONE_OPEN;
 dec:
-		atomic_dec(&sbi->s_open_zones);
+		atomic_dec(&sbi->s_wro_seq_files);
 	}
 	mutex_unlock(&zi->i_truncate_mutex);
 }
@@ -1688,9 +1690,10 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_gid = GLOBAL_ROOT_GID;
 	sbi->s_perm = 0640;
 	sbi->s_mount_opts = ZONEFS_MNTOPT_ERRORS_RO;
-	sbi->s_max_open_zones = bdev_max_open_zones(sb->s_bdev);
-	atomic_set(&sbi->s_open_zones, 0);
-	if (!sbi->s_max_open_zones &&
+
+	atomic_set(&sbi->s_wro_seq_files, 0);
+	sbi->s_max_wro_seq_files = bdev_max_open_zones(sb->s_bdev);
+	if (!sbi->s_max_wro_seq_files &&
 	    sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
 		zonefs_info(sb, "No open zones limit. Ignoring explicit_open mount option\n");
 		sbi->s_mount_opts &= ~ZONEFS_MNTOPT_EXPLICIT_OPEN;

fs/zonefs/zonefs.h

@@ -182,8 +182,8 @@ struct zonefs_sb_info {
 	loff_t			s_blocks;
 	loff_t			s_used_blocks;
 
-	unsigned int		s_max_open_zones;
-	atomic_t		s_open_zones;
+	unsigned int		s_max_wro_seq_files;
+	atomic_t		s_wro_seq_files;
 };
 
 static inline struct zonefs_sb_info *ZONEFS_SB(struct super_block *sb)