ext4: Respect group descriptor size when adjusting free counts

Also adjust high 16/32 bits when free inode/block counts are modified.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

2 files changed, 69 insertions, 24 deletions

diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index 7e496dc6ee..a37911ffd4 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -59,22 +59,51 @@ static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
 
 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
 {
-	sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) - 1);
+	uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
+	free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
+	free_blocks--;
+
+	sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
+	sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
 }
 
-static inline void ext4fs_bg_free_inodes_dec(struct ext2_block_group *bg)
+static inline void ext4fs_bg_free_inodes_dec
+	(struct ext2_block_group *bg, const struct ext_filesystem *fs)
 {
-	bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) - 1);
+	uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
+	if (fs->gdsize == 64)
+		free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
+	free_inodes--;
+
+	bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
+	if (fs->gdsize == 64)
+		bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
 }
 
-static inline void ext4fs_bg_free_blocks_dec(struct ext2_block_group *bg)
+static inline void ext4fs_bg_free_blocks_dec
+	(struct ext2_block_group *bg, const struct ext_filesystem *fs)
 {
-	bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) - 1);
+	uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
+	if (fs->gdsize == 64)
+		free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
+	free_blocks--;
+
+	bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
+	if (fs->gdsize == 64)
+		bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
 }
 
-static inline void ext4fs_bg_itable_unused_dec(struct ext2_block_group *bg)
+static inline void ext4fs_bg_itable_unused_dec
+	(struct ext2_block_group *bg, const struct ext_filesystem *fs)
 {
-	bg->bg_itable_unused = cpu_to_le16(le16_to_cpu(bg->bg_itable_unused) - 1);
+	uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
+	if (fs->gdsize == 64)
+		free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
+	free_inodes--;
+
+	bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
+	if (fs->gdsize == 64)
+		bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
 }
 
 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
@@ -966,7 +995,7 @@ uint32_t ext4fs_get_new_blk_no(void)
 				fs->curr_blkno = fs->curr_blkno +
 						(i * fs->blksz * 8);
 				fs->first_pass_bbmap++;
-				ext4fs_bg_free_blocks_dec(bgd);
+				ext4fs_bg_free_blocks_dec(bgd, fs);
 				ext4fs_sb_free_blocks_dec(fs->sb);
 				status = ext4fs_devread(b_bitmap_blk *
 							fs->sect_perblk,
@@ -1041,7 +1070,7 @@ restart:
 
 			prev_bg_bitmap_index = bg_idx;
 		}
-		ext4fs_bg_free_blocks_dec(bgd);
+		ext4fs_bg_free_blocks_dec(bgd, fs);
 		ext4fs_sb_free_blocks_dec(fs->sb);
 		goto success;
 	}
@@ -1100,9 +1129,9 @@ int ext4fs_get_new_inode_no(void)
 				fs->curr_inode_no = fs->curr_inode_no +
 							(i * inodes_per_grp);
 				fs->first_pass_ibmap++;
-				ext4fs_bg_free_inodes_dec(bgd);
+				ext4fs_bg_free_inodes_dec(bgd, fs);
 				if (has_gdt_chksum)
-					ext4fs_bg_itable_unused_dec(bgd);
+					ext4fs_bg_itable_unused_dec(bgd, fs);
 				ext4fs_sb_free_inodes_dec(fs->sb);
 				status = ext4fs_devread(i_bitmap_blk *
 							fs->sect_perblk,
@@ -1156,7 +1185,7 @@ restart:
 				goto fail;
 			prev_inode_bitmap_index = ibmap_idx;
 		}
-		ext4fs_bg_free_inodes_dec(bgd);
+		ext4fs_bg_free_inodes_dec(bgd, fs);
 		if (has_gdt_chksum)
 			bgd->bg_itable_unused = bgd->free_inodes;
 		ext4fs_sb_free_inodes_dec(fs->sb);
diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index 8343ab1d6d..b863412850 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -41,14 +41,30 @@ static inline void ext4fs_sb_free_blocks_inc(struct ext2_sblock *sb)
 	sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) + 1);
 }
 
-static inline void ext4fs_bg_free_inodes_inc(struct ext2_block_group *bg)
+static inline void ext4fs_bg_free_inodes_inc
+	(struct ext2_block_group *bg, const struct ext_filesystem *fs)
 {
-	bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) + 1);
+	uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
+	if (fs->gdsize == 64)
+		free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
+	free_inodes++;
+
+	bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
+	if (fs->gdsize == 64)
+		bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
 }
 
-static inline void ext4fs_bg_free_blocks_inc(struct ext2_block_group *bg)
+static inline void ext4fs_bg_free_blocks_inc
+	(struct ext2_block_group *bg, const struct ext_filesystem *fs)
 {
-	bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) + 1);
+	uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
+	if (fs->gdsize == 64)
+		free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
+	free_blocks++;
+
+	bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
+	if (fs->gdsize == 64)
+		bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
 }
 
 static void ext4fs_update(void)
@@ -149,7 +165,7 @@ static void delete_single_indirect_block(struct ext2_inode *inode)
 		ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 		/* get  block group descriptor table */
 		bgd = ext4fs_get_group_descriptor(fs, bg_idx);
-		ext4fs_bg_free_blocks_inc(bgd);
+		ext4fs_bg_free_blocks_inc(bgd, fs);
 		ext4fs_sb_free_blocks_inc(fs->sb);
 		/* journal backup */
 		if (prev_bg_bmap_idx != bg_idx) {
@@ -213,7 +229,7 @@ static void delete_double_indirect_block(struct ext2_inode *inode)
 			ext4fs_reset_block_bmap(le32_to_cpu(*di_buffer),
 					fs->blk_bmaps[bg_idx], bg_idx);
 			di_buffer++;
-			ext4fs_bg_free_blocks_inc(bgd);
+			ext4fs_bg_free_blocks_inc(bgd, fs);
 			ext4fs_sb_free_blocks_inc(fs->sb);
 			/* journal backup */
 			if (prev_bg_bmap_idx != bg_idx) {
@@ -244,7 +260,7 @@ static void delete_double_indirect_block(struct ext2_inode *inode)
 		/* get  block group descriptor table */
 		bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 		ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
-		ext4fs_bg_free_blocks_inc(bgd);
+		ext4fs_bg_free_blocks_inc(bgd, fs);
 		ext4fs_sb_free_blocks_inc(fs->sb);
 		/* journal backup */
 		if (prev_bg_bmap_idx != bg_idx) {
@@ -325,7 +341,7 @@ static void delete_triple_indirect_block(struct ext2_inode *inode)
 				tip_buffer++;
 				/* get  block group descriptor table */
 				bgd = ext4fs_get_group_descriptor(fs, bg_idx);
-				ext4fs_bg_free_blocks_inc(bgd);
+				ext4fs_bg_free_blocks_inc(bgd, fs);
 				ext4fs_sb_free_blocks_inc(fs->sb);
 				/* journal backup */
 				if (prev_bg_bmap_idx != bg_idx) {
@@ -365,7 +381,7 @@ static void delete_triple_indirect_block(struct ext2_inode *inode)
 			tigp_buffer++;
 			/* get  block group descriptor table */
 			bgd = ext4fs_get_group_descriptor(fs, bg_idx);
-			ext4fs_bg_free_blocks_inc(bgd);
+			ext4fs_bg_free_blocks_inc(bgd, fs);
 			ext4fs_sb_free_blocks_inc(fs->sb);
 			/* journal backup */
 			if (prev_bg_bmap_idx != bg_idx) {
@@ -397,7 +413,7 @@ static void delete_triple_indirect_block(struct ext2_inode *inode)
 		ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 		/* get  block group descriptor table */
 		bgd = ext4fs_get_group_descriptor(fs, bg_idx);
-		ext4fs_bg_free_blocks_inc(bgd);
+		ext4fs_bg_free_blocks_inc(bgd, fs);
 		ext4fs_sb_free_blocks_inc(fs->sb);
 		/* journal backup */
 		if (prev_bg_bmap_idx != bg_idx) {
@@ -484,7 +500,7 @@ static int ext4fs_delete_file(int inodeno)
 
 		/* get  block group descriptor table */
 		bgd = ext4fs_get_group_descriptor(fs, bg_idx);
-		ext4fs_bg_free_blocks_inc(bgd);
+		ext4fs_bg_free_blocks_inc(bgd, fs);
 		ext4fs_sb_free_blocks_inc(fs->sb);
 		/* journal backup */
 		if (prev_bg_bmap_idx != bg_idx) {
@@ -539,7 +555,7 @@ static int ext4fs_delete_file(int inodeno)
 	/* update the respective inode bitmaps */
 	inodeno++;
 	ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
-	ext4fs_bg_free_inodes_inc(bgd);
+	ext4fs_bg_free_inodes_inc(bgd, fs);
 	ext4fs_sb_free_inodes_inc(fs->sb);
 	/* journal backup */
 	memset(journal_buffer, '\0', fs->blksz);