Merge tag 'exfat-for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat

Pull exfat updates from Namjae Jeon:

 - don't clear MediaFailure and VolumeDirty bit in volume flags if these
   were already set before mounting

 - write multiple dirty buffers at once in sync mode

 - remove unneeded EXFAT_SB_DIRTY bit set

* tag 'exfat-for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat:
  exfat: retain 'VolumeFlags' properly
  exfat: optimize exfat_zeroed_cluster()
  exfat: add error check when updating dir-entries
  exfat: write multiple sectors at once
  exfat: remove EXFAT_SB_DIRTY flag

fs/exfat/balloc.c

@@ -158,7 +158,7 @@ int exfat_set_bitmap(struct inode *inode, unsigned int clu)
 	b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx);
 
 	set_bit_le(b, sbi->vol_amap[i]->b_data);
-	exfat_update_bh(sb, sbi->vol_amap[i], IS_DIRSYNC(inode));
+	exfat_update_bh(sbi->vol_amap[i], IS_DIRSYNC(inode));
 	return 0;
 }
 
@@ -180,7 +180,7 @@ void exfat_clear_bitmap(struct inode *inode, unsigned int clu)
 	b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx);
 
 	clear_bit_le(b, sbi->vol_amap[i]->b_data);
-	exfat_update_bh(sb, sbi->vol_amap[i], IS_DIRSYNC(inode));
+	exfat_update_bh(sbi->vol_amap[i], IS_DIRSYNC(inode));
 
 	if (opts->discard) {
 		int ret_discard;

fs/exfat/dir.c

@@ -470,7 +470,7 @@ int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
 			&ep->dentry.file.access_date,
 			NULL);
 
-	exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
+	exfat_update_bh(bh, IS_DIRSYNC(inode));
 	brelse(bh);
 
 	ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, &sector);
@@ -480,7 +480,7 @@ int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
 	exfat_init_stream_entry(ep,
 		(type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN,
 		start_clu, size);
-	exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
+	exfat_update_bh(bh, IS_DIRSYNC(inode));
 	brelse(bh);
 
 	return 0;
@@ -516,7 +516,7 @@ int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
 	}
 
 	fep->dentry.file.checksum = cpu_to_le16(chksum);
-	exfat_update_bh(sb, fbh, IS_DIRSYNC(inode));
+	exfat_update_bh(fbh, IS_DIRSYNC(inode));
 release_fbh:
 	brelse(fbh);
 	return ret;
@@ -538,7 +538,7 @@ int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
 		return -EIO;
 
 	ep->dentry.file.num_ext = (unsigned char)(num_entries - 1);
-	exfat_update_bh(sb, bh, sync);
+	exfat_update_bh(bh, sync);
 	brelse(bh);
 
 	ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, &sector);
@@ -547,7 +547,7 @@ int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
 
 	ep->dentry.stream.name_len = p_uniname->name_len;
 	ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash);
-	exfat_update_bh(sb, bh, sync);
+	exfat_update_bh(bh, sync);
 	brelse(bh);
 
 	for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) {
@@ -556,7 +556,7 @@ int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
 			return -EIO;
 
 		exfat_init_name_entry(ep, uniname);
-		exfat_update_bh(sb, bh, sync);
+		exfat_update_bh(bh, sync);
 		brelse(bh);
 		uniname += EXFAT_FILE_NAME_LEN;
 	}
@@ -580,7 +580,7 @@ int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
 			return -EIO;
 
 		exfat_set_entry_type(ep, TYPE_DELETED);
-		exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
+		exfat_update_bh(bh, IS_DIRSYNC(inode));
 		brelse(bh);
 	}
 
@@ -604,16 +604,20 @@ void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
 	es->modified = true;
 }
 
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 {
-	int i;
+	int i, err = 0;
 
-	for (i = 0; i < es->num_bh; i++) {
 	if (es->modified)
-			exfat_update_bh(es->sb, es->bh[i], sync);
+		err = exfat_update_bhs(es->bh, es->num_bh, sync);
+
+	for (i = 0; i < es->num_bh; i++)
+		if (err)
+			bforget(es->bh[i]);
+		else
 			brelse(es->bh[i]);
-	}
 	kfree(es);
+	return err;
 }
 
 static int exfat_walk_fat_chain(struct super_block *sb,

fs/exfat/exfat_fs.h

@@ -13,8 +13,6 @@
 #define EXFAT_SUPER_MAGIC       0x2011BAB0UL
 #define EXFAT_ROOT_INO		1
 
-#define EXFAT_SB_DIRTY		0
-
 #define EXFAT_CLUSTERS_UNTRACKED (~0u)
 
 /*
@@ -226,7 +224,8 @@ struct exfat_sb_info {
 	unsigned int num_FAT_sectors; /* num of FAT sectors */
 	unsigned int root_dir; /* root dir cluster */
 	unsigned int dentries_per_clu; /* num of dentries per cluster */
-	unsigned int vol_flag; /* volume dirty flag */
+	unsigned int vol_flags; /* volume flags */
+	unsigned int vol_flags_persistent; /* volume flags to retain */
 	struct buffer_head *boot_bh; /* buffer_head of BOOT sector */
 
 	unsigned int map_clu; /* allocation bitmap start cluster */
@@ -238,7 +237,6 @@ struct exfat_sb_info {
 	unsigned int clu_srch_ptr; /* cluster search pointer */
 	unsigned int used_clusters; /* number of used clusters */
 
-	unsigned long s_state;
 	struct mutex s_lock; /* superblock lock */
 	struct exfat_mount_options options;
 	struct nls_table *nls_io; /* Charset used for input and display */
@@ -383,7 +381,8 @@ static inline int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
 }
 
 /* super.c */
-int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag);
+int exfat_set_volume_dirty(struct super_block *sb);
+int exfat_clear_volume_dirty(struct super_block *sb);
 
 /* fatent.c */
 #define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu)
@@ -463,7 +462,7 @@ struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
 		int num);
 struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
 		struct exfat_chain *p_dir, int entry, unsigned int type);
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
 
 /* inode.c */
@@ -515,7 +514,8 @@ void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
 		u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
-void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync);
+void exfat_update_bh(struct buffer_head *bh, int sync);
+int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
 		unsigned int size, unsigned char flags);
 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);

fs/exfat/exfat_raw.h

@@ -14,9 +14,8 @@
 
 #define EXFAT_MAX_FILE_LEN	255
 
-#define VOL_CLEAN		0x0000
-#define VOL_DIRTY		0x0002
-#define ERR_MEDIUM		0x0004
+#define VOLUME_DIRTY		0x0002
+#define MEDIA_FAILURE		0x0004
 
 #define EXFAT_EOF_CLUSTER	0xFFFFFFFFu
 #define EXFAT_BAD_CLUSTER	0xFFFFFFF7u

fs/exfat/fatent.c

@@ -75,7 +75,7 @@ int exfat_ent_set(struct super_block *sb, unsigned int loc,
 
 	fat_entry = (__le32 *)&(bh->b_data[off]);
 	*fat_entry = cpu_to_le32(content);
-	exfat_update_bh(sb, bh, sb->s_flags & SB_SYNCHRONOUS);
+	exfat_update_bh(bh, sb->s_flags & SB_SYNCHRONOUS);
 	exfat_mirror_bh(sb, sec, bh);
 	brelse(bh);
 	return 0;
@@ -174,7 +174,6 @@ int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain)
 		return -EIO;
 	}
 
-	set_bit(EXFAT_SB_DIRTY, &sbi->s_state);
 	clu = p_chain->dir;
 
 	if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
@@ -230,21 +229,6 @@ int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
 	return 0;
 }
 
-static inline int exfat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
-{
-	int i, err = 0;
-
-	for (i = 0; i < nr_bhs; i++)
-		write_dirty_buffer(bhs[i], 0);
-
-	for (i = 0; i < nr_bhs; i++) {
-		wait_on_buffer(bhs[i]);
-		if (!err && !buffer_uptodate(bhs[i]))
-			err = -EIO;
-	}
-	return err;
-}
-
 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu)
 {
 	struct super_block *sb = dir->i_sb;
@@ -266,41 +250,23 @@ int exfat_zeroed_cluster(struct inode *dir, unsigned int clu)
 	}
 
 	/* Zeroing the unused blocks on this cluster */
-	n = 0;
 	while (blknr < last_blknr) {
+		for (n = 0; n < nr_bhs && blknr < last_blknr; n++, blknr++) {
 			bhs[n] = sb_getblk(sb, blknr);
 			if (!bhs[n]) {
 				err = -ENOMEM;
 				goto release_bhs;
 			}
 			memset(bhs[n]->b_data, 0, sb->s_blocksize);
-		exfat_update_bh(sb, bhs[n], 0);
-
-		n++;
-		blknr++;
-
-		if (n == nr_bhs) {
-			if (IS_DIRSYNC(dir)) {
-				err = exfat_sync_bhs(bhs, n);
-				if (err)
-					goto release_bhs;
-			}
-
-			for (i = 0; i < n; i++)
-				brelse(bhs[i]);
-			n = 0;
-		}
 		}
 
-	if (IS_DIRSYNC(dir)) {
-		err = exfat_sync_bhs(bhs, n);
+		err = exfat_update_bhs(bhs, n, IS_DIRSYNC(dir));
 		if (err)
 			goto release_bhs;
-	}
 
 		for (i = 0; i < n; i++)
 			brelse(bhs[i]);
-
+	}
 	return 0;
 
 release_bhs:
@@ -358,8 +324,6 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 		}
 	}
 
-	set_bit(EXFAT_SB_DIRTY, &sbi->s_state);
-
 	p_chain->dir = EXFAT_EOF_CLUSTER;
 
 	while ((new_clu = exfat_find_free_bitmap(sb, hint_clu)) !=

fs/exfat/file.c

@@ -106,7 +106,7 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
 		return -EPERM;
 
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 
 	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
 	num_clusters_phys =
@@ -154,6 +154,7 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 		struct timespec64 ts;
 		struct exfat_dentry *ep, *ep2;
 		struct exfat_entry_set_cache *es;
+		int err;
 
 		es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 				ES_ALL_ENTRIES);
@@ -188,7 +189,9 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 		}
 
 		exfat_update_dir_chksum_with_entry_set(es);
-		exfat_free_dentry_set(es, inode_needs_sync(inode));
+		err = exfat_free_dentry_set(es, inode_needs_sync(inode));
+		if (err)
+			return err;
 	}
 
 	/* cut off from the FAT chain */
@@ -217,7 +220,7 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 	if (exfat_free_cluster(inode, &clu))
 		return -EIO;
 
-	exfat_set_vol_flags(sb, VOL_CLEAN);
+	exfat_clear_volume_dirty(sb);
 
 	return 0;
 }

fs/exfat/inode.c

@@ -39,7 +39,7 @@ static int __exfat_write_inode(struct inode *inode, int sync)
 	if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
 		return 0;
 
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 
 	/* get the directory entry of given file or directory */
 	es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES);
@@ -77,8 +77,7 @@ static int __exfat_write_inode(struct inode *inode, int sync)
 	ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
 
 	exfat_update_dir_chksum_with_entry_set(es);
-	exfat_free_dentry_set(es, sync);
-	return 0;
+	return exfat_free_dentry_set(es, sync);
 }
 
 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
@@ -168,7 +167,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 	}
 
 	if (*clu == EXFAT_EOF_CLUSTER) {
-		exfat_set_vol_flags(sb, VOL_DIRTY);
+		exfat_set_volume_dirty(sb);
 
 		new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 				EXFAT_EOF_CLUSTER : last_clu + 1;
@@ -222,6 +221,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 		if (ei->dir.dir != DIR_DELETED && modified) {
 			struct exfat_dentry *ep;
 			struct exfat_entry_set_cache *es;
+			int err;
 
 			es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 				ES_ALL_ENTRIES);
@@ -240,8 +240,9 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 				ep->dentry.stream.valid_size;
 
 			exfat_update_dir_chksum_with_entry_set(es);
-			exfat_free_dentry_set(es, inode_needs_sync(inode));
-
+			err = exfat_free_dentry_set(es, inode_needs_sync(inode));
+			if (err)
+				return err;
 		} /* end of if != DIR_DELETED */
 
 		inode->i_blocks +=

fs/exfat/misc.c

@@ -163,9 +163,8 @@ u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type)
 	return chksum;
 }
 
-void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync)
+void exfat_update_bh(struct buffer_head *bh, int sync)
 {
-	set_bit(EXFAT_SB_DIRTY, &EXFAT_SB(sb)->s_state);
 	set_buffer_uptodate(bh);
 	mark_buffer_dirty(bh);
 
@@ -173,6 +172,25 @@ void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync)
 		sync_dirty_buffer(bh);
 }
 
+int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
+{
+	int i, err = 0;
+
+	for (i = 0; i < nr_bhs; i++) {
+		set_buffer_uptodate(bhs[i]);
+		mark_buffer_dirty(bhs[i]);
+		if (sync)
+			write_dirty_buffer(bhs[i], 0);
+	}
+
+	for (i = 0; i < nr_bhs && sync; i++) {
+		wait_on_buffer(bhs[i]);
+		if (!err && !buffer_uptodate(bhs[i]))
+			err = -EIO;
+	}
+	return err;
+}
+
 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
 		unsigned int size, unsigned char flags)
 {

fs/exfat/namei.c

@@ -387,7 +387,7 @@ static int exfat_find_empty_entry(struct inode *inode,
 			ep->dentry.stream.valid_size = cpu_to_le64(size);
 			ep->dentry.stream.size = ep->dentry.stream.valid_size;
 			ep->dentry.stream.flags = p_dir->flags;
-			exfat_update_bh(sb, bh, IS_DIRSYNC(inode));
+			exfat_update_bh(bh, IS_DIRSYNC(inode));
 			brelse(bh);
 			if (exfat_update_dir_chksum(inode, &(ei->dir),
 			    ei->entry))
@@ -562,10 +562,10 @@ static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	int err;
 
 	mutex_lock(&EXFAT_SB(sb)->s_lock);
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 	err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
 		&info);
-	exfat_set_vol_flags(sb, VOL_CLEAN);
+	exfat_clear_volume_dirty(sb);
 	if (err)
 		goto unlock;
 
@@ -834,7 +834,7 @@ static int exfat_unlink(struct inode *dir, struct dentry *dentry)
 	num_entries++;
 	brelse(bh);
 
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 	/* update the directory entry */
 	if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
 		err = -EIO;
@@ -843,7 +843,7 @@ static int exfat_unlink(struct inode *dir, struct dentry *dentry)
 
 	/* This doesn't modify ei */
 	ei->dir.dir = DIR_DELETED;
-	exfat_set_vol_flags(sb, VOL_CLEAN);
+	exfat_clear_volume_dirty(sb);
 
 	inode_inc_iversion(dir);
 	dir->i_mtime = dir->i_atime = current_time(dir);
@@ -873,10 +873,10 @@ static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	int err;
 
 	mutex_lock(&EXFAT_SB(sb)->s_lock);
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 	err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
 		&info);
-	exfat_set_vol_flags(sb, VOL_CLEAN);
+	exfat_clear_volume_dirty(sb);
 	if (err)
 		goto unlock;
 
@@ -1001,14 +1001,14 @@ static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
 	num_entries++;
 	brelse(bh);
 
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 	err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
 	if (err) {
 		exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
 		goto unlock;
 	}
 	ei->dir.dir = DIR_DELETED;
-	exfat_set_vol_flags(sb, VOL_CLEAN);
+	exfat_clear_volume_dirty(sb);
 
 	inode_inc_iversion(dir);
 	dir->i_mtime = dir->i_atime = current_time(dir);
@@ -1071,7 +1071,7 @@ static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 			epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
 			ei->attr |= ATTR_ARCHIVE;
 		}
-		exfat_update_bh(sb, new_bh, sync);
+		exfat_update_bh(new_bh, sync);
 		brelse(old_bh);
 		brelse(new_bh);
 
@@ -1087,7 +1087,7 @@ static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 		}
 
 		memcpy(epnew, epold, DENTRY_SIZE);
-		exfat_update_bh(sb, new_bh, sync);
+		exfat_update_bh(new_bh, sync);
 		brelse(old_bh);
 		brelse(new_bh);
 
@@ -1104,7 +1104,7 @@ static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 			epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
 			ei->attr |= ATTR_ARCHIVE;
 		}
-		exfat_update_bh(sb, old_bh, sync);
+		exfat_update_bh(old_bh, sync);
 		brelse(old_bh);
 		ret = exfat_init_ext_entry(inode, p_dir, oldentry,
 			num_new_entries, p_uniname);
@@ -1159,7 +1159,7 @@ static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
 		epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
 		ei->attr |= ATTR_ARCHIVE;
 	}
-	exfat_update_bh(sb, new_bh, IS_DIRSYNC(inode));
+	exfat_update_bh(new_bh, IS_DIRSYNC(inode));
 	brelse(mov_bh);
 	brelse(new_bh);
 
@@ -1175,7 +1175,7 @@ static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
 	}
 
 	memcpy(epnew, epmov, DENTRY_SIZE);
-	exfat_update_bh(sb, new_bh, IS_DIRSYNC(inode));
+	exfat_update_bh(new_bh, IS_DIRSYNC(inode));
 	brelse(mov_bh);
 	brelse(new_bh);
 
@@ -1300,7 +1300,7 @@ static int __exfat_rename(struct inode *old_parent_inode,
 	if (ret)
 		goto out;
 
-	exfat_set_vol_flags(sb, VOL_DIRTY);
+	exfat_set_volume_dirty(sb);
 
 	if (olddir.dir == newdir.dir)
 		ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
@@ -1355,7 +1355,7 @@ static int __exfat_rename(struct inode *old_parent_inode,
 		 */
 		new_ei->dir.dir = DIR_DELETED;
 	}
-	exfat_set_vol_flags(sb, VOL_CLEAN);
+	exfat_clear_volume_dirty(sb);
 out:
 	return ret;
 }

fs/exfat/super.c

@@ -45,9 +45,6 @@ static void exfat_put_super(struct super_block *sb)
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 
 	mutex_lock(&sbi->s_lock);
-	if (test_and_clear_bit(EXFAT_SB_DIRTY, &sbi->s_state))
-		sync_blockdev(sb->s_bdev);
-	exfat_set_vol_flags(sb, VOL_CLEAN);
 	exfat_free_bitmap(sbi);
 	brelse(sbi->boot_bh);
 	mutex_unlock(&sbi->s_lock);
@@ -60,13 +57,14 @@ static int exfat_sync_fs(struct super_block *sb, int wait)
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 	int err = 0;
 
+	if (!wait)
+		return 0;
+
 	/* If there are some dirty buffers in the bdev inode */
 	mutex_lock(&sbi->s_lock);
-	if (test_and_clear_bit(EXFAT_SB_DIRTY, &sbi->s_state)) {
 	sync_blockdev(sb->s_bdev);
-		if (exfat_set_vol_flags(sb, VOL_CLEAN))
+	if (exfat_clear_volume_dirty(sb))
 		err = -EIO;
-	}
 	mutex_unlock(&sbi->s_lock);
 	return err;
 }
@@ -98,17 +96,20 @@ static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf)
 	return 0;
 }
 
-int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag)
+static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags)
 {
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 	struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data;
 	bool sync;
 
+	/* retain persistent-flags */
+	new_flags |= sbi->vol_flags_persistent;
+
 	/* flags are not changed */
-	if (sbi->vol_flag == new_flag)
+	if (sbi->vol_flags == new_flags)
 		return 0;
 
-	sbi->vol_flag = new_flag;
+	sbi->vol_flags = new_flags;
 
 	/* skip updating volume dirty flag,
 	 * if this volume has been mounted with read-only
@@ -116,9 +117,9 @@ int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag)
 	if (sb_rdonly(sb))
 		return 0;
 
-	p_boot->vol_flags = cpu_to_le16(new_flag);
+	p_boot->vol_flags = cpu_to_le16(new_flags);
 
-	if (new_flag == VOL_DIRTY && !buffer_dirty(sbi->boot_bh))
+	if ((new_flags & VOLUME_DIRTY) && !buffer_dirty(sbi->boot_bh))
 		sync = true;
 	else
 		sync = false;
@@ -131,6 +132,20 @@ int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag)
 	return 0;
 }
 
+int exfat_set_volume_dirty(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY);
+}
+
+int exfat_clear_volume_dirty(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+	return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY);
+}
+
 static int exfat_show_options(struct seq_file *m, struct dentry *root)
 {
 	struct super_block *sb = root->d_sb;
@@ -459,7 +474,8 @@ static int exfat_read_boot_sector(struct super_block *sb)
 	sbi->dentries_per_clu = 1 <<
 		(sbi->cluster_size_bits - DENTRY_SIZE_BITS);
 
-	sbi->vol_flag = le16_to_cpu(p_boot->vol_flags);
+	sbi->vol_flags = le16_to_cpu(p_boot->vol_flags);
+	sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE);
 	sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER;
 	sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED;
 
@@ -474,9 +490,9 @@ static int exfat_read_boot_sector(struct super_block *sb)
 		exfat_err(sb, "bogus data start sector");
 		return -EINVAL;
 	}
-	if (sbi->vol_flag & VOL_DIRTY)
+	if (sbi->vol_flags & VOLUME_DIRTY)
 		exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck.");
-	if (sbi->vol_flag & ERR_MEDIUM)
+	if (sbi->vol_flags & MEDIA_FAILURE)
 		exfat_warn(sb, "Medium has reported failures. Some data may be lost.");
 
 	/* exFAT file size is limited by a disk volume size */