fs/ext4: Support device block sizes != 512 bytes

The 512 byte block size was hard coded in the ext4 file systems.
Large harddisks today support bigger block sizes typically 4096
bytes.
This patch removes this limitation.

Signed-off-by: Egbert Eich <eich@suse.com>

1 files changed, 17 insertions, 15 deletions

diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index c4e399ccfa..0c1f62b60c 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -614,14 +614,13 @@ int ext4fs_init(void)
 	/* populate fs */
 	fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
 	fs->inodesz = INODE_SIZE_FILESYSTEM(ext4fs_root);
-	fs->sect_perblk = fs->blksz / SECTOR_SIZE;
+	fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
 
 	/* get the superblock */
 	fs->sb = zalloc(SUPERBLOCK_SIZE);
 	if (!fs->sb)
 		return -ENOMEM;
-	if (!ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE,
-			(char *)fs->sb))
+	if (!ext4_read_superblock((char *)fs->sb))
 		goto fail;
 
 	/* init journal */
@@ -722,7 +721,7 @@ void ext4fs_deinit(void)
 	ext4fs_free_journal();
 
 	/* get the superblock */
-	ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE, (char *)fs->sb);
+	ext4_read_superblock((char *)fs->sb);
 	fs->sb->feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 	put_ext4((uint64_t)(SUPERBLOCK_SIZE),
 		 (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
@@ -766,9 +765,10 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 {
 	int i;
 	int blockcnt;
-	int log2blocksize = LOG2_EXT2_BLOCK_SIZE(ext4fs_root);
 	unsigned int filesize = __le32_to_cpu(file_inode->size);
 	struct ext_filesystem *fs = get_fs();
+	int log2blksz = fs->dev_desc->log2blksz;
+	int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
 	int previous_block_number = -1;
 	int delayed_start = 0;
 	int delayed_extent = 0;
@@ -789,16 +789,16 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 		if (blknr < 0)
 			return -1;
 
-		blknr = blknr << log2blocksize;
+		blknr = blknr << log2_fs_blocksize;
 
 		if (blknr) {
 			if (previous_block_number != -1) {
 				if (delayed_next == blknr) {
 					delayed_extent += blockend;
-					delayed_next += blockend >> SECTOR_BITS;
+					delayed_next += blockend >> log2blksz;
 				} else {	/* spill */
-					put_ext4((uint64_t) (delayed_start *
-							     SECTOR_SIZE),
+					put_ext4((uint64_t)
+						 (delayed_start << log2blksz),
 						 delayed_buf,
 						 (uint32_t) delayed_extent);
 					previous_block_number = blknr;
@@ -806,7 +806,7 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 					delayed_extent = blockend;
 					delayed_buf = buf;
 					delayed_next = blknr +
-					    (blockend >> SECTOR_BITS);
+					    (blockend >> log2blksz);
 				}
 			} else {
 				previous_block_number = blknr;
@@ -814,13 +814,14 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 				delayed_extent = blockend;
 				delayed_buf = buf;
 				delayed_next = blknr +
-				    (blockend >> SECTOR_BITS);
+				    (blockend >> log2blksz);
 			}
 		} else {
 			if (previous_block_number != -1) {
 				/* spill */
-				put_ext4((uint64_t) (delayed_start *
-						     SECTOR_SIZE), delayed_buf,
+				put_ext4((uint64_t) (delayed_start <<
+						     log2blksz),
+					 delayed_buf,
 					 (uint32_t) delayed_extent);
 				previous_block_number = -1;
 			}
@@ -830,7 +831,7 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
 	}
 	if (previous_block_number != -1) {
 		/* spill */
-		put_ext4((uint64_t) (delayed_start * SECTOR_SIZE),
+		put_ext4((uint64_t) (delayed_start << log2blksz),
 			 delayed_buf, (uint32_t) delayed_extent);
 		previous_block_number = -1;
 	}
@@ -921,7 +922,8 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
 	/* Allocate data blocks */
 	ext4fs_allocate_blocks(file_inode, blocks_remaining,
 			       &blks_reqd_for_file);
-	file_inode->blockcnt = (blks_reqd_for_file * fs->blksz) / SECTOR_SIZE;
+	file_inode->blockcnt = (blks_reqd_for_file * fs->blksz) >>
+		fs->dev_desc->log2blksz;
 
 	temp_ptr = zalloc(fs->blksz);
 	if (!temp_ptr)