[RFC][11/21]ext3 enlarge file size

[sho@tnes.nec.co.jp]

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 sho@tnes.nec.co.jp
---
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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