vfs: Add 64 bit i_version support
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@us.ibm.com>
Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@bull.net>
Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 33fe39a..0cc3597 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -546,11 +546,11 @@
dentry->d_op = &afs_fs_dentry_operations;
d_add(dentry, inode);
- _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }",
+ _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
fid.vnode,
fid.unique,
dentry->d_inode->i_ino,
- dentry->d_inode->i_version);
+ (unsigned long long)dentry->d_inode->i_version);
return NULL;
}
@@ -630,9 +630,10 @@
* been deleted and replaced, and the original vnode ID has
* been reused */
if (fid.unique != vnode->fid.unique) {
- _debug("%s: file deleted (uq %u -> %u I:%lu)",
+ _debug("%s: file deleted (uq %u -> %u I:%llu)",
dentry->d_name.name, fid.unique,
- vnode->fid.unique, dentry->d_inode->i_version);
+ vnode->fid.unique,
+ (unsigned long long)dentry->d_inode->i_version);
spin_lock(&vnode->lock);
set_bit(AFS_VNODE_DELETED, &vnode->flags);
spin_unlock(&vnode->lock);
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index d196840..84750c8 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -301,7 +301,8 @@
inode = dentry->d_inode;
- _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
+ _enter("{ ino=%lu v=%llu }", inode->i_ino,
+ (unsigned long long)inode->i_version);
generic_fillattr(inode, stat);
return 0;
diff --git a/fs/inode.c b/fs/inode.c
index ed35383..b48324a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1243,6 +1243,23 @@
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
*
@@ -1276,6 +1293,11 @@
sync_it = 1;
}
+ if (IS_I_VERSION(inode)) {
+ inode_inc_iversion(inode);
+ sync_it = 1;
+ }
+
if (sync_it)
mark_inode_dirty_sync(inode);
}