This patch update the i_version field of the inode and add a mount
option to enable this feature. The other condition to enable this
feature is that the inode size should be 256-bytes.
Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@xxxxxxxx>
---
fs/ext4/inode.c | 4 +++-
fs/ext4/super.c | 7 ++++++-
include/linux/ext4_fs.h | 1 +
3 files changed, 10 insertions(+), 2 deletions(-)
Index: linux-2.6.23-rc8-ext4-i_version/fs/ext4/inode.c
===================================================================
--- linux-2.6.23-rc8-ext4-i_version.orig/fs/ext4/inode.c 2007-10-03
18:11:17.000000000 +0200
+++ linux-2.6.23-rc8-ext4-i_version/fs/ext4/inode.c 2007-10-05
10:26:42.000000000 +0200
@@ -3173,7 +3173,9 @@
{
int err = 0;
- inode->i_version++;
+ if (test_opt(inode->i_sb, I_VERSION))
+ inode_inc_iversion(inode);
+
/* the do_update_inode consumes one bh->b_count */
get_bh(iloc->bh);
Index: linux-2.6.23-rc8-ext4-i_version/fs/ext4/super.c
===================================================================
--- linux-2.6.23-rc8-ext4-i_version.orig/fs/ext4/super.c 2007-10-03
18:11:17.000000000 +0200
+++ linux-2.6.23-rc8-ext4-i_version/fs/ext4/super.c 2007-10-03
18:17:44.000000000 +0200
@@ -742,7 +742,7 @@
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Opt_grpquota, Opt_extents, Opt_noextents, Opt_delalloc,
- Opt_mballoc, Opt_nomballoc, Opt_stripe,
+ Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_i_version,
};
static match_table_t tokens = {
@@ -800,6 +800,7 @@
{Opt_mballoc, "mballoc"},
{Opt_nomballoc, "nomballoc"},
{Opt_stripe, "stripe=%u"},
+ {Opt_i_version, "i_version"},
{Opt_err, NULL},
{Opt_resize, "resize"},
};
@@ -1161,6 +1162,10 @@
return 0;
sbi->s_stripe = option;
break;
+ case Opt_i_version:
+ set_opt (sbi->s_mount_opt, I_VERSION);
+ sb->s_flags |= MS_I_VERSION;
+ break;
default:
printk (KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
Index: linux-2.6.23-rc8-ext4-i_version/include/linux/ext4_fs.h
===================================================================
--- linux-2.6.23-rc8-ext4-i_version.orig/include/linux/ext4_fs.h
2007-10-03 18:11:17.000000000 +0200
+++ linux-2.6.23-rc8-ext4-i_version/include/linux/ext4_fs.h 2007-10-03
18:11:54.000000000 +0200
@@ -500,6 +500,7 @@
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async
Commit */
#define EXT4_MOUNT_DELALLOC 0x2000000 /* Delalloc support */
#define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
+#define EXT4_MOUNT_I_VERSION 0x8000000 /* i_version support */
/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at
once */
#ifndef _LINUX_EXT2_FS_H
#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
-
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