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Date:	Thu, 25 Oct 2007 19:04:35 +0200
From:	Cordenner jean noel <jean-noel.cordenner@...l.net>
To:	linux-ext4@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2]  i_version update - ext4 part

This patch adds 64-bit inode version support to ext4. The lower 32 bits
are stored in the osd1.linux1.l_i_version field while the high 32 bits
are stored in the i_version_hi field newly created in the ext4_inode.
This field is incremented in case the ext4_inode is large enough. A
i_version mount option has been added to enable the feature.

Signed-off-by: Mingming Cao <cmm@...ibm.com>
Signed-off-by: Andreas Dilger <adilger@...sterfs.com>
Signed-off-by: Kalpak Shah <kalpak@...sterfs.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@...l.net>
---
 fs/ext4/inode.c         |   18 +++++++++++++++++-
 fs/ext4/super.c         |    8 ++++++--
 include/linux/ext4_fs.h |    6 +++++-
 3 files changed, 28 insertions(+), 4 deletions(-)

Index: linux-2.6.23-ext4-1/fs/ext4/inode.c
===================================================================
--- linux-2.6.23-ext4-1.orig/fs/ext4/inode.c	2007-10-25
18:49:24.000000000 +0200
+++ linux-2.6.23-ext4-1/fs/ext4/inode.c	2007-10-25 18:57:35.000000000
+0200
@@ -2806,6 +2806,13 @@
 	EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode);
 	EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode);
 
+	inode->i_version = le32_to_cpu(raw_inode->i_disk_version);
+	if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) {
+		if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi))
+			inode->i_version |=
+			(__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32;
+	}
+
 	if (S_ISREG(inode->i_mode)) {
 		inode->i_op = &ext4_file_inode_operations;
 		inode->i_fop = &ext4_file_operations;
@@ -2944,8 +2951,14 @@
 	} else for (block = 0; block < EXT4_N_BLOCKS; block++)
 		raw_inode->i_block[block] = ei->i_data[block];
 
-	if (ei->i_extra_isize)
+	raw_inode->i_disk_version = cpu_to_le32(inode->i_version);
+	if (ei->i_extra_isize) {
+		if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi))
+			raw_inode->i_version_hi =
+			cpu_to_le32(inode->i_version >> 32);
 		raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize);
+	}
+
 
 	BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata");
 	rc = ext4_journal_dirty_metadata(handle, bh);
@@ -3161,6 +3174,9 @@
 {
 	int err = 0;
 
+	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-ext4-1/fs/ext4/super.c
===================================================================
--- linux-2.6.23-ext4-1.orig/fs/ext4/super.c	2007-10-25
18:49:24.000000000 +0200
+++ linux-2.6.23-ext4-1/fs/ext4/super.c	2007-10-25 18:57:35.000000000
+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\" "
@@ -2968,7 +2973,6 @@
 		i_size_write(inode, off+len-towrite);
 		EXT4_I(inode)->i_disksize = inode->i_size;
 	}
-	inode->i_version++;
 	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	ext4_mark_inode_dirty(handle, inode);
 	mutex_unlock(&inode->i_mutex);
Index: linux-2.6.23-ext4-1/include/linux/ext4_fs.h
===================================================================
--- linux-2.6.23-ext4-1.orig/include/linux/ext4_fs.h	2007-10-25
18:49:24.000000000 +0200
+++ linux-2.6.23-ext4-1/include/linux/ext4_fs.h	2007-10-25
18:57:55.000000000 +0200
@@ -314,7 +314,7 @@
 	__le32	i_flags;	/* File flags */
 	union {
 		struct {
-			__u32  l_i_reserved1;
+			__le32  l_i_version;
 		} linux1;
 		struct {
 			__u32  h_i_translator;
@@ -356,6 +356,7 @@
 	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch)
*/
 	__le32  i_crtime;       /* File Creation time */
 	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch)
*/
+	__le32  i_version_hi;	/* high 32 bits for 64-bit version */
 };
 
 #define i_size_high	i_dir_acl
@@ -430,6 +431,8 @@
 				       raw_inode->xtime ## _extra);	       \
 } while (0)
 
+#define i_disk_version osd1.linux1.l_i_version
+
 #if defined(__KERNEL__) || defined(__linux__)
 #define i_reserved1	osd1.linux1.l_i_reserved1
 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
@@ -493,6 +496,7 @@
 #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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