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Subject[EXT4 set 4][PATCH 5/5] i_version: noversion mount option to disable inode version updates
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Add a "noversion" mount option to disable inode version updates.

Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>

Index: linux-2.6.21/fs/ext4/super.c
===================================================================
--- linux-2.6.21.orig/fs/ext4/super.c
+++ linux-2.6.21/fs/ext4/super.c
@@ -725,7 +725,7 @@ enum {
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
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_grpquota, Opt_extents, Opt_noextents, Opt_noversion,
};

static match_table_t tokens = {
@@ -777,6 +777,7 @@ static match_table_t tokens = {
{Opt_barrier, "barrier=%u"},
{Opt_extents, "extents"},
{Opt_noextents, "noextents"},
+ {Opt_noversion, "noversion"},
{Opt_err, NULL},
{Opt_resize, "resize"},
};
@@ -1115,6 +1116,9 @@ clear_qf_name:
case Opt_noextents:
clear_opt (sbi->s_mount_opt, EXTENTS);
break;
+ case Opt_noversion:
+ set_opt(sbi->s_mount_opt, NOVERSION);
+ break;
default:
printk (KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
Index: linux-2.6.21/include/linux/ext4_fs.h
===================================================================
--- linux-2.6.21.orig/include/linux/ext4_fs.h
+++ linux-2.6.21/include/linux/ext4_fs.h
@@ -473,6 +473,7 @@ do { \
#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
+#define EXT4_MOUNT_NOVERSION 0x800000 /* No inode version updates */

/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
#ifndef _LINUX_EXT2_FS_H
Index: linux-2.6.21/fs/ext4/inode.c
===================================================================
--- linux-2.6.21.orig/fs/ext4/inode.c
+++ linux-2.6.21/fs/ext4/inode.c
@@ -3082,7 +3082,9 @@ int ext4_mark_iloc_dirty(handle_t *handl
{
int err = 0;

- inode->i_version++;
+ if (!test_opt(inode->i_sb, NOVERSION))
+ inode->i_version++;
+
/* the do_update_inode consumes one bh->b_count */
get_bh(iloc->bh);


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