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Date: Thu, 25 Oct 2007 19:04:30 +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 1/2] i_version update - vfs part
Hi,
This is an update of the previous patches on the ext4 git tree, the 2
coming patches applies at the end of the current ext4-patch-queue, and
replaces the inode-version related patches:
64-bit-i_version.patch
i_version_hi.patch
ext4_i_version_hi_2.patch
i_version_update_ext4.patch
The first part deals with the vfs part.
The i_version field of the inode is changed to be a 64-bit counter that
is set on every inode creation and that is incremented every time the
inode data is modified (similarly to the "ctime" time-stamp).
The aim is to fulfill a NFSv4 requirement for rfc3530.
This first part concerns the vfs, it converts the 32-bit i_version in
the generic inode to a 64-bit, a flag is added in the super block in
order to check if the feature is enabled and the i_version is
incremented in the vfs.
Signed-off-by: Mingming Cao <cmm@...ibm.com>
Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@...l.net>
Signed-off-by: Kalpak Shah <kalpak@...sterfs.com>
---
fs/inode.c | 22 ++++++++++++++++++++++
include/linux/fs.h | 5 ++++-
2 files changed, 26 insertions(+), 1 deletion(-)
Index: linux-2.6.23-ext4-1/include/linux/fs.h
===================================================================
--- linux-2.6.23-ext4-1.orig/include/linux/fs.h 2007-10-25
16:25:23.000000000 +0200
+++ linux-2.6.23-ext4-1/include/linux/fs.h 2007-10-25 16:25:53.000000000
+0200
@@ -123,6 +123,7 @@
#define MS_SLAVE (1<<19) /* change to slave */
#define MS_SHARED (1<<20) /* change to shared */
#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
+#define MS_I_VERSION (1<<22) /* Update inode I_version field */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
@@ -172,6 +173,7 @@
((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
+#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
@@ -541,7 +543,7 @@
uid_t i_uid;
gid_t i_gid;
dev_t i_rdev;
- unsigned long i_version;
+ u64 i_version;
loff_t i_size;
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
@@ -1284,6 +1286,7 @@
mark_inode_dirty(inode);
}
+extern void inode_inc_iversion(struct inode *inode);
extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
static inline void file_accessed(struct file *file)
{
Index: linux-2.6.23-ext4-1/fs/inode.c
===================================================================
--- linux-2.6.23-ext4-1.orig/fs/inode.c 2007-10-25 16:15:52.000000000
+0200
+++ linux-2.6.23-ext4-1/fs/inode.c 2007-10-25 16:25:53.000000000 +0200
@@ -1216,6 +1216,24 @@
EXPORT_SYMBOL(touch_atime);
/**
+ * inode_inc_iversion - increments i_version
+ * @inode: inode that need to be updated
+ *
+ * Every time the inode is modified, the i_version field
+ * will be incremented.
+ * The filesystem has to be mounted with i_version flag
+ *
+ */
+
+void inode_inc_iversion(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ inode->i_version++;
+ spin_unlock(&inode->i_lock);
+}
+
+/**
* file_update_time - update mtime and ctime time
* @file: file accessed
*
@@ -1249,6 +1267,11 @@
sync_it = 1;
}
+ if (IS_I_VERSION(inode)) {
+ inode_inc_iversion(inode);
+ sync_it = 1;
+ }
+
if (sync_it)
mark_inode_dirty_sync(inode);
}
-
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