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vfs: Add 64 bit i_version support

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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>
This commit is contained in:
Jean Noel Cordenner
2008-01-28 23:58:27 -05:00
committed by Theodore Ts'o
parent 818d276ceb
commit 7a224228ed
4 changed files with 33 additions and 6 deletions
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22
fs/inode.c
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@@ -1242,6 +1242,23 @@ void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
}
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 @@ void file_update_time(struct file *file)
sync_it = 1;
}
if (IS_I_VERSION(inode)) {
inode_inc_iversion(inode);
sync_it = 1;
}
if (sync_it)
mark_inode_dirty_sync(inode);
}