[PATCH] ext4: allow larger descriptor size
make block group descriptor larger.
Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index df77ea8..3dacb12 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -74,10 +74,12 @@
return NULL;
}
- desc = (struct ext4_group_desc *) sbi->s_group_desc[group_desc]->b_data;
+ desc = (struct ext4_group_desc *)(
+ (__u8 *)sbi->s_group_desc[group_desc]->b_data +
+ offset * EXT4_DESC_SIZE(sb));
if (bh)
*bh = sbi->s_group_desc[group_desc];
- return desc + offset;
+ return desc;
}
/**
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c05dc57..d03e7d8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2432,14 +2432,16 @@
return 0;
}
- gdp = (struct ext4_group_desc *)bh->b_data;
+ gdp = (struct ext4_group_desc *)((__u8 *)bh->b_data +
+ desc * EXT4_DESC_SIZE(sb));
/*
* Figure out the offset within the block group inode table
*/
offset = ((ino - 1) % EXT4_INODES_PER_GROUP(sb)) *
EXT4_INODE_SIZE(sb);
- block = ext4_inode_table(gdp + desc) +
- (offset >> EXT4_BLOCK_SIZE_BITS(sb));
+ block = ext4_inode_table(gdp) + (offset >> EXT4_BLOCK_SIZE_BITS(sb));
+
+
iloc->block_group = block_group;
iloc->offset = offset & (EXT4_BLOCK_SIZE(sb) - 1);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index d844175..bc8848b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1268,7 +1268,8 @@
return 0;
}
first_block += EXT4_BLOCKS_PER_GROUP(sb);
- gdp++;
+ gdp = (struct ext4_group_desc *)
+ ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
}
ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
@@ -1619,7 +1620,18 @@
sbi->s_frag_size, blocksize);
goto failed_mount;
}
- sbi->s_frags_per_block = 1;
+ sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
+ if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE ||
+ sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
+ sbi->s_desc_size & (sbi->s_desc_size - 1)) {
+ printk(KERN_ERR
+ "EXT4-fs: unsupported descriptor size %ld\n",
+ sbi->s_desc_size);
+ goto failed_mount;
+ }
+ } else
+ sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
@@ -1630,7 +1642,7 @@
goto cantfind_ext4;
sbi->s_itb_per_group = sbi->s_inodes_per_group /
sbi->s_inodes_per_block;
- sbi->s_desc_per_block = blocksize / sizeof(struct ext4_group_desc);
+ sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
sbi->s_sbh = bh;
sbi->s_mount_state = le16_to_cpu(es->s_state);
sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));