Summary of this patch:
[11/21] enlarge file size(ext3)
- If the flag is set to super block, i_blocks of disk inode
(ext3_inode) is filesystem-block unit, and i_blocks of VFS
inode is sector unit.
- If the flag is set to super block, max file size is set to
(FS blocksize) * (2^32 -1).
Signed-off-by: Takashi Sato [email protected]
---
diff -upNr -X linux-2.6.17-rc1/Documentation/dontdiff linux-2.6.17-rc1.tmp/fs/ext3/inode.c linux-2.6.17-rc1.tmp2/fs/ext3/inode.c
--- linux-2.6.17-rc1.tmp/fs/ext3/inode.c 2006-04-07 08:53:35.000000000 +0900
+++ linux-2.6.17-rc1.tmp2/fs/ext3/inode.c 2006-04-07 09:02:09.000000000 +0900
@@ -2578,6 +2578,7 @@ void ext3_read_inode(struct inode * inod
struct ext3_inode *raw_inode;
struct ext3_inode_info *ei = EXT3_I(inode);
struct buffer_head *bh;
+ struct super_block *sb = inode->i_sb;
int block;
#ifdef CONFIG_EXT3_FS_POSIX_ACL
@@ -2627,7 +2628,13 @@ void ext3_read_inode(struct inode * inod
inode->i_blksize = PAGE_SIZE; /* This is the optimal IO size
* (for stat), not the fs block
* size */
- inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
+ if (EXT3_HAS_INCOMPAT_FEATURE(sb,
+ EXT3_FEATURE_INCOMPAT_LARGE_BLOCK)) {
+ inode->i_blocks = (blkcnt_t)le32_to_cpu(raw_inode->i_blocks)
+ << (inode->i_blkbits - EXT3_SECTOR_BITS);
+ } else {
+ inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
+ }
ei->i_flags = le32_to_cpu(raw_inode->i_flags);
#ifdef EXT3_FRAGMENTS
ei->i_faddr = le32_to_cpu(raw_inode->i_faddr);
@@ -2723,6 +2730,7 @@ static int ext3_do_update_inode(handle_t
struct ext3_inode *raw_inode = ext3_raw_inode(iloc);
struct ext3_inode_info *ei = EXT3_I(inode);
struct buffer_head *bh = iloc->bh;
+ struct super_block *sb = inode->i_sb;
int err = 0, rc, block;
/* For fields not not tracking in the in-memory inode,
@@ -2760,7 +2768,13 @@ static int ext3_do_update_inode(handle_t
raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
- raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
+ if (EXT3_HAS_INCOMPAT_FEATURE(sb,
+ EXT3_FEATURE_INCOMPAT_LARGE_BLOCK)) {
+ raw_inode->i_blocks = cpu_to_le32((inode->i_blocks)
+ >> (inode->i_blkbits - EXT3_SECTOR_BITS));
+ } else {
+ raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
+ }
raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
raw_inode->i_flags = cpu_to_le32(ei->i_flags);
#ifdef EXT3_FRAGMENTS
diff -upNr -X linux-2.6.17-rc1/Documentation/dontdiff linux-2.6.17-rc1.tmp/fs/ext3/super.c linux-2.6.17-rc1.tmp2/fs/ext3/super.c
--- linux-2.6.17-rc1.tmp/fs/ext3/super.c 2006-04-07 08:56:16.000000000 +0900
+++ linux-2.6.17-rc1.tmp2/fs/ext3/super.c 2006-04-07 09:02:09.000000000 +0900
@@ -1297,14 +1297,20 @@ static void ext3_orphan_cleanup (struct
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
* We need to be 1 filesystem block less than the 2^32 sector limit.
*/
-static loff_t ext3_max_size(int bits)
+static loff_t ext3_max_size(int bits, struct super_block *sb)
{
loff_t res = EXT3_NDIR_BLOCKS;
/* This constant is calculated to be the largest file size for a
* dense, 4k-blocksize file such that the total number of
* sectors in the file, including data and all indirect blocks,
* does not exceed 2^32. */
- const loff_t upper_limit = 0x1ff7fffd000LL;
+ loff_t upper_limit;
+ if(EXT3_HAS_INCOMPAT_FEATURE(sb,
+ EXT3_FEATURE_INCOMPAT_LARGE_BLOCK)) {
+ upper_limit = (1LL << (bits + 32)) - 1;
+ } else {
+ upper_limit = 0x1ff7fffd000LL;
+ }
res += 1LL << (bits-2);
res += 1LL << (2*(bits-2));
@@ -1512,7 +1518,7 @@ static int ext3_fill_super (struct super
}
}
- sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
+ sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits, sb);
if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
@@ -1703,6 +1709,15 @@ static int ext3_fill_super (struct super
*/
root = iget(sb, EXT3_ROOT_INO);
+ /* To appoint -O large block option, LSF needs to be enabled */
+ if (EXT3_HAS_INCOMPAT_FEATURE(sb,
+ EXT3_FEATURE_INCOMPAT_LARGE_BLOCK)) {
+ if (sizeof(root->i_blocks) < sizeof(u64)) {
+ printk(KERN_ERR "EXT3-fs: %s: Unsupported large block option"\
+ "with LSF disabled.\n", sb->s_id);
+ goto failed_mount;
+ }
+ }
sb->s_root = d_alloc_root(root);
if (!sb->s_root) {
printk(KERN_ERR "EXT3-fs: get root inode failed\n");
diff -upNr -X linux-2.6.17-rc1/Documentation/dontdiff linux-2.6.17-rc1.tmp/include/linux/ext3_fs.h linux-2.6.17-rc1.tmp2/include/linux/ext3_fs.h
--- linux-2.6.17-rc1.tmp/include/linux/ext3_fs.h 2006-04-07 08:56:16.000000000 +0900
+++ linux-2.6.17-rc1.tmp2/include/linux/ext3_fs.h 2006-04-07 09:02:09.000000000 +0900
@@ -99,6 +99,7 @@ struct statfs;
#else
# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
#endif
+#define EXT3_SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
#ifdef __KERNEL__
#define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
#define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
-
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