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authorEgbert Eich <eich@suse.com>2013-05-01 01:13:19 +0000
committerTom Rini <trini@ti.com>2013-05-10 08:16:33 -0400
commit50ce4c07df1c98aabf4630b35152ed95a87242f7 (patch)
treec7e506ab5bcb2839a697cb0a89faa3244077cf69 /fs/ext4/ext4_common.c
parentb1e6c4c3d4a2b394096766d959aaa9b51a38099b (diff)
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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>
Diffstat (limited to 'fs/ext4/ext4_common.c')
-rw-r--r--fs/ext4/ext4_common.c42
1 files changed, 23 insertions, 19 deletions
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index f12b805..58880b4 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -71,18 +71,18 @@ void put_ext4(uint64_t off, void *buf, uint32_t size)
uint64_t startblock;
uint64_t remainder;
unsigned char *temp_ptr = NULL;
- ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, SECTOR_SIZE);
struct ext_filesystem *fs = get_fs();
+ int log2blksz = fs->dev_desc->log2blksz;
+ ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
- startblock = off / (uint64_t)SECTOR_SIZE;
+ startblock = off >> log2blksz;
startblock += part_offset;
- remainder = off % (uint64_t)SECTOR_SIZE;
- remainder &= SECTOR_SIZE - 1;
+ remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
if (fs->dev_desc == NULL)
return;
- if ((startblock + (size / SECTOR_SIZE)) >
+ if ((startblock + (size >> log2blksz)) >
(part_offset + fs->total_sect)) {
printf("part_offset is %lu\n", part_offset);
printf("total_sector is %llu\n", fs->total_sect);
@@ -101,10 +101,10 @@ void put_ext4(uint64_t off, void *buf, uint32_t size)
startblock, 1, sec_buf);
}
} else {
- if (size / SECTOR_SIZE != 0) {
+ if (size >> log2blksz != 0) {
fs->dev_desc->block_write(fs->dev_desc->dev,
startblock,
- size / SECTOR_SIZE,
+ size >> log2blksz,
(unsigned long *)buf);
} else {
fs->dev_desc->block_read(fs->dev_desc->dev,
@@ -1459,6 +1459,7 @@ static int ext4fs_blockgroup
{
long int blkno;
unsigned int blkoff, desc_per_blk;
+ int log2blksz = get_fs()->dev_desc->log2blksz;
desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
@@ -1469,7 +1470,7 @@ static int ext4fs_blockgroup
debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
group, blkno, blkoff);
- return ext4fs_devread(blkno << LOG2_EXT2_BLOCK_SIZE(data),
+ return ext4fs_devread(blkno << (LOG2_BLOCK_SIZE(data) - log2blksz),
blkoff, sizeof(struct ext2_block_group),
(char *)blkgrp);
}
@@ -1479,6 +1480,7 @@ int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
struct ext2_block_group blkgrp;
struct ext2_sblock *sblock = &data->sblock;
struct ext_filesystem *fs = get_fs();
+ int log2blksz = get_fs()->dev_desc->log2blksz;
int inodes_per_block, status;
long int blkno;
unsigned int blkoff;
@@ -1495,7 +1497,8 @@ int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
(ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
blkoff = (ino % inodes_per_block) * fs->inodesz;
/* Read the inode. */
- status = ext4fs_devread(blkno << LOG2_EXT2_BLOCK_SIZE(data), blkoff,
+ status = ext4fs_devread(blkno << (LOG2_BLOCK_SIZE(data) - log2blksz),
+ blkoff,
sizeof(struct ext2_inode), (char *)inode);
if (status == 0)
return 0;
@@ -1515,7 +1518,9 @@ long int read_allocated_block(struct ext2_inode *inode, int fileblock)
unsigned long long start;
/* get the blocksize of the filesystem */
blksz = EXT2_BLOCK_SIZE(ext4fs_root);
- log2_blksz = LOG2_EXT2_BLOCK_SIZE(ext4fs_root);
+ log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
+ - get_fs()->dev_desc->log2blksz;
+
if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
char *buf = zalloc(blksz);
if (!buf)
@@ -1523,11 +1528,11 @@ long int read_allocated_block(struct ext2_inode *inode, int fileblock)
struct ext4_extent_header *ext_block;
struct ext4_extent *extent;
int i = -1;
- ext_block = ext4fs_get_extent_block(ext4fs_root, buf,
- (struct ext4_extent_header
- *)inode->b.
- blocks.dir_blocks,
- fileblock, log2_blksz);
+ ext_block =
+ ext4fs_get_extent_block(ext4fs_root, buf,
+ (struct ext4_extent_header *)
+ inode->b.blocks.dir_blocks,
+ fileblock, log2_blksz);
if (!ext_block) {
printf("invalid extent block\n");
free(buf);
@@ -1839,7 +1844,7 @@ long int read_allocated_block(struct ext2_inode *inode, int fileblock)
blknr = __le32_to_cpu(ext4fs_indir3_block
[rblock % perblock_child]);
}
- debug("ext4fs_read_block %ld\n", blknr);
+ debug("read_allocated_block %ld\n", blknr);
return blknr;
}
@@ -2193,13 +2198,12 @@ int ext4fs_mount(unsigned part_length)
struct ext2_data *data;
int status;
struct ext_filesystem *fs = get_fs();
- data = zalloc(sizeof(struct ext2_data));
+ data = zalloc(SUPERBLOCK_SIZE);
if (!data)
return 0;
/* Read the superblock. */
- status = ext4fs_devread(1 * 2, 0, sizeof(struct ext2_sblock),
- (char *)&data->sblock);
+ status = ext4_read_superblock((char *)&data->sblock);
if (status == 0)
goto fail;