[U-Boot] [PATCH v2 4/4] fs/ext4: Support device block sizes != 512 bytes
Egbert Eich
egbert.eich at gmail.com
Wed Apr 10 09:11:57 CEST 2013
From: Egbert Eich <eich at suse.com>
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 at suse.com>
---
Changes for v2:
- Coding style fixes.
fs/ext4/dev.c | 62 ++++++++++++++++++++++++++++++++------------------
fs/ext4/ext4_common.c | 42 ++++++++++++++++++----------------
fs/ext4/ext4_common.h | 2 +-
fs/ext4/ext4_journal.c | 6 ++---
fs/ext4/ext4_write.c | 32 ++++++++++++++------------
fs/ext4/ext4fs.c | 14 +++++++-----
include/ext4fs.h | 1 +
include/ext_common.h | 12 +++-------
8 files changed, 95 insertions(+), 76 deletions(-)
diff --git a/fs/ext4/dev.c b/fs/ext4/dev.c
index 464a67d..3e993cc 100644
--- a/fs/ext4/dev.c
+++ b/fs/ext4/dev.c
@@ -40,6 +40,7 @@
#include <config.h>
#include <ext4fs.h>
#include <ext_common.h>
+#include "ext4_common.h"
unsigned long part_offset;
@@ -48,37 +49,41 @@ static disk_partition_t *part_info;
void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
{
+ assert(rbdd->blksz == (1 << rbdd->log2blksz));
ext4fs_block_dev_desc = rbdd;
part_info = info;
part_offset = info->start;
- get_fs()->total_sect = (info->size * info->blksz) / SECTOR_SIZE;
+ get_fs()->total_sect = (info->size * info->blksz) >>
+ get_fs()->dev_desc->log2blksz;
get_fs()->dev_desc = rbdd;
}
int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
{
- ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE);
unsigned block_len;
+ int log2blksz = ext4fs_block_dev_desc->log2blksz;
+ ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ?
+ ext4fs_block_dev_desc->blksz :
+ 0));
+ if (ext4fs_block_dev_desc == NULL) {
+ printf("** Invalid Block Device Descriptor (NULL)\n");
+ return 0;
+ }
/* Check partition boundaries */
- if ((sector < 0)
- || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
- part_info->size)) {
+ if ((sector < 0) ||
+ ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
+ >= part_info->size)) {
printf("%s read outside partition %d\n", __func__, sector);
return 0;
}
/* Get the read to the beginning of a partition */
- sector += byte_offset >> SECTOR_BITS;
- byte_offset &= SECTOR_SIZE - 1;
+ sector += byte_offset >> log2blksz;
+ byte_offset &= ext4fs_block_dev_desc->blksz - 1;
debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
- if (ext4fs_block_dev_desc == NULL) {
- printf("** Invalid Block Device Descriptor (NULL)\n");
- return 0;
- }
-
if (byte_offset != 0) {
/* read first part which isn't aligned with start of sector */
if (ext4fs_block_dev_desc->
@@ -89,9 +94,12 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
return 0;
}
memcpy(buf, sec_buf + byte_offset,
- min(SECTOR_SIZE - byte_offset, byte_len));
- buf += min(SECTOR_SIZE - byte_offset, byte_len);
- byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
+ min(ext4fs_block_dev_desc->blksz
+ - byte_offset, byte_len));
+ buf += min(ext4fs_block_dev_desc->blksz
+ - byte_offset, byte_len);
+ byte_len -= min(ext4fs_block_dev_desc->blksz
+ - byte_offset, byte_len);
sector++;
}
@@ -99,12 +107,12 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
return 1;
/* read sector aligned part */
- block_len = byte_len & ~(SECTOR_SIZE - 1);
+ block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
if (block_len == 0) {
- ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE);
+ ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz);
- block_len = SECTOR_SIZE;
+ block_len = ext4fs_block_dev_desc->blksz;
ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
part_info->start + sector,
1, (unsigned long *)p);
@@ -114,16 +122,16 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
part_info->start + sector,
- block_len / SECTOR_SIZE,
+ block_len >> log2blksz,
(unsigned long *) buf) !=
- block_len / SECTOR_SIZE) {
+ block_len >> log2blksz) {
printf(" ** %s read error - block\n", __func__);
return 0;
}
- block_len = byte_len & ~(SECTOR_SIZE - 1);
+ block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
buf += block_len;
byte_len -= block_len;
- sector += block_len / SECTOR_SIZE;
+ sector += block_len / ext4fs_block_dev_desc->blksz;
if (byte_len != 0) {
/* read rest of data which are not in whole sector */
@@ -138,3 +146,13 @@ int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
}
return 1;
}
+
+int ext4_read_superblock(char *buffer)
+{
+ struct ext_filesystem *fs = get_fs();
+ int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
+ int off = SUPERBLOCK_START % fs->dev_desc->blksz;
+
+ return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
+ buffer);
+}
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index f12b805..38c9603 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->log2blks;
+ 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;
diff --git a/fs/ext4/ext4_common.h b/fs/ext4/ext4_common.h
index 72cd020..6571df6 100644
--- a/fs/ext4/ext4_common.h
+++ b/fs/ext4/ext4_common.h
@@ -49,7 +49,7 @@
#define S_IFLNK 0120000 /* symbolic link */
#define BLOCK_NO_ONE 1
-#define SUPERBLOCK_SECTOR 2
+#define SUPERBLOCK_START (2 * 512)
#define SUPERBLOCK_SIZE 1024
#define F_FILE 1
diff --git a/fs/ext4/ext4_journal.c b/fs/ext4/ext4_journal.c
index ba4a7bb..81aa5fc 100644
--- a/fs/ext4/ext4_journal.c
+++ b/fs/ext4/ext4_journal.c
@@ -534,16 +534,14 @@ end:
jsb->s_start = cpu_to_be32(1);
jsb->s_sequence = cpu_to_be32(be32_to_cpu(jsb->s_sequence) + 1);
/* 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;
/* Update the super block */
put_ext4((uint64_t) (SUPERBLOCK_SIZE),
(struct ext2_sblock *)fs->sb,
(uint32_t) SUPERBLOCK_SIZE);
- ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE,
- (char *)fs->sb);
+ ext4_read_superblock((char *)fs->sb);
blknr = read_allocated_block(&inode_journal,
EXT2_JOURNAL_SUPERBLOCK);
diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index c4e399c..f76a464 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);
@@ -766,7 +765,8 @@ static int ext4fs_write_file(struct ext2_inode *file_inode,
{
int i;
int blockcnt;
- int log2blocksize = LOG2_EXT2_BLOCK_SIZE(ext4fs_root);
+ int log2blksz = fs->dev_desc->log2blksz;
+ int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
unsigned int filesize = __le32_to_cpu(file_inode->size);
struct ext_filesystem *fs = get_fs();
int previous_block_number = -1;
@@ -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)
diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c
index 4dddde2..1954afb 100644
--- a/fs/ext4/ext4fs.c
+++ b/fs/ext4/ext4fs.c
@@ -60,10 +60,12 @@ void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
int ext4fs_read_file(struct ext2fs_node *node, int pos,
unsigned int len, char *buf)
{
+ struct ext_filesystem *fs = get_fs();
int i;
int blockcnt;
- int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data);
- int blocksize = 1 << (log2blocksize + DISK_SECTOR_BITS);
+ int log2blksz = fs->dev_desc->log2blksz;
+ int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
+ int blocksize = (1 << (log2_fs_blocksize + log2blksz));
unsigned int filesize = __le32_to_cpu(node->inode.size);
int previous_block_number = -1;
int delayed_start = 0;
@@ -88,7 +90,7 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos,
if (blknr < 0)
return -1;
- blknr = blknr << log2blocksize;
+ blknr = blknr << log2_fs_blocksize;
/* Last block. */
if (i == blockcnt - 1) {
@@ -110,7 +112,7 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos,
if (previous_block_number != -1) {
if (delayed_next == blknr) {
delayed_extent += blockend;
- delayed_next += blockend >> SECTOR_BITS;
+ delayed_next += blockend >> log2blksz;
} else { /* spill */
status = ext4fs_devread(delayed_start,
delayed_skipfirst,
@@ -124,7 +126,7 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos,
delayed_skipfirst = skipfirst;
delayed_buf = buf;
delayed_next = blknr +
- (blockend >> SECTOR_BITS);
+ (blockend >> log2blksz);
}
} else {
previous_block_number = blknr;
@@ -133,7 +135,7 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos,
delayed_skipfirst = skipfirst;
delayed_buf = buf;
delayed_next = blknr +
- (blockend >> SECTOR_BITS);
+ (blockend >> log2blksz);
}
} else {
if (previous_block_number != -1) {
diff --git a/include/ext4fs.h b/include/ext4fs.h
index 025a2e8..379f7eb 100644
--- a/include/ext4fs.h
+++ b/include/ext4fs.h
@@ -141,4 +141,5 @@ long int read_allocated_block(struct ext2_inode *inode, int fileblock);
int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
disk_partition_t *fs_partition);
int ext4_read_file(const char *filename, void *buf, int offset, int len);
+int ext4_read_superblock(char *buffer);
#endif
diff --git a/include/ext_common.h b/include/ext_common.h
index 86373a6..78a7808 100644
--- a/include/ext_common.h
+++ b/include/ext_common.h
@@ -34,7 +34,6 @@
#define __EXT_COMMON__
#include <command.h>
#define SECTOR_SIZE 0x200
-#define SECTOR_BITS 9
/* Magic value used to identify an ext2 filesystem. */
#define EXT2_MAGIC 0xEF53
@@ -58,18 +57,13 @@
#define FILETYPE_INO_SYMLINK 0120000
#define EXT2_ROOT_INO 2 /* Root inode */
-/* Bits used as offset in sector */
-#define DISK_SECTOR_BITS 9
/* The size of an ext2 block in bytes. */
#define EXT2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE(data))
-/* Log2 size of ext2 block in 512 blocks. */
-#define LOG2_EXT2_BLOCK_SIZE(data) (__le32_to_cpu \
- (data->sblock.log2_block_size) + 1)
-
/* Log2 size of ext2 block in bytes. */
-#define LOG2_BLOCK_SIZE(data) (__le32_to_cpu \
- (data->sblock.log2_block_size) + 10)
+#define LOG2_BLOCK_SIZE(data) (__le32_to_cpu \
+ (data->sblock.log2_block_size) \
+ + EXT2_MIN_BLOCK_LOG_SIZE)
#define INODE_SIZE_FILESYSTEM(data) (__le32_to_cpu \
(data->sblock.inode_size))
--
1.8.1.4
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