Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ce421581794f6593830b056969ad7536ab929b2f
Commit: ce421581794f6593830b056969ad7536ab929b2f
Parent: c1bddad9491b3941f7ae27eeee1e4f4822fb3169
Author: Jose R. Santos <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 18:38:25 2007 -0400
Committer: Theodore Ts'o <[EMAIL PROTECTED]>
CommitDate: Wed Oct 17 18:50:01 2007 -0400
ext4: FLEX_BG Kernel support v2.
This feature relaxes check restrictions on where each block groups meta
data is located within the storage media. This allows for the allocation
of bitmaps or inode tables outside the block group boundaries in cases
where bad blocks forces us to look for new blocks which the owning block
group can not satisfy. This will also allow for new meta-data allocation
schemes to improve performance and scalability.
Signed-off-by: Jose R. Santos <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
fs/ext4/super.c | 9 +++++++--
include/linux/ext4_fs.h | 4 +++-
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dd4ff9c..54450fa 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1358,13 +1358,17 @@ static int ext4_check_descriptors (struct super_block *
sb)
ext4_fsblk_t inode_table;
struct ext4_group_desc * gdp = NULL;
int desc_block = 0;
+ int flexbg_flag = 0;
int i;
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+ flexbg_flag = 1;
+
ext4_debug ("Checking group descriptors");
for (i = 0; i < sbi->s_groups_count; i++)
{
- if (i == sbi->s_groups_count - 1)
+ if (i == sbi->s_groups_count - 1 || flexbg_flag)
last_block = ext4_blocks_count(sbi->s_es) - 1;
else
last_block = first_block +
@@ -1409,7 +1413,8 @@ static int ext4_check_descriptors (struct super_block *
sb)
le16_to_cpu(gdp->bg_checksum));
return 0;
}
- first_block += EXT4_BLOCKS_PER_GROUP(sb);
+ if (!flexbg_flag)
+ first_block += EXT4_BLOCKS_PER_GROUP(sb);
gdp = (struct ext4_group_desc *)
((__u8 *)gdp + EXT4_DESC_SIZE(sb));
}
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 722d4ef..46b304d 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -682,13 +682,15 @@ static inline int ext4_valid_inum(struct super_block *sb,
unsigned long ino)
#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
+#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
EXT4_FEATURE_INCOMPAT_RECOVER| \
EXT4_FEATURE_INCOMPAT_META_BG| \
EXT4_FEATURE_INCOMPAT_EXTENTS| \
- EXT4_FEATURE_INCOMPAT_64BIT)
+ EXT4_FEATURE_INCOMPAT_64BIT| \
+ EXT4_FEATURE_INCOMPAT_FLEX_BG)
#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
-
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