change attribute for ext4: change attribute in the VFS

Index: linux-2.6.19-rc2-mm2-CA/fs/attr.c
===================================================================
@@ -88,6 +88,9 @@
        if (ia_valid & ATTR_CTIME)
                inode->i_ctime = timespec_trunc(attr->ia_ctime,
                                                inode->i_sb->s_time_gran);
+       if (ia_valid & ATTR_CHANGE_ATTRIBUTE)
+               inode->i_change_attribute = attr->ia_change_attribute;
+
        if (ia_valid & ATTR_MODE) {
                umode_t mode = attr->ia_mode;
 

@@ -112,6 +115,7 @@
        mode = inode->i_mode;
        now = current_fs_time(inode->i_sb);
 
+       inode->i_change_attribute++;
        attr->ia_ctime = now;
        if (!(ia_valid & ATTR_ATIME_SET))
                attr->ia_atime = now;

Index: linux-2.6.19-rc2-mm2-CA/fs/bad_inode.c
===================================================================
@@ -95,6 +95,7 @@
        inode->i_mode = S_IFREG;
        inode->i_atime = inode->i_mtime = inode->i_ctime =
                current_fs_time(inode->i_sb);
+       inode->i_change_attribute++;
        inode->i_op = &bad_inode_ops;
        inode->i_fop = &bad_file_ops;
 }

Index: linux-2.6.19-rc2-mm2-CA/fs/binfmt_misc.c
===================================================================
@@ -508,6 +508,7 @@
                inode->i_blocks = 0;
                inode->i_atime = inode->i_mtime = inode->i_ctime =
                        current_fs_time(inode->i_sb);
+               inode->i_change_attribute = 1;
        }
        return inode;
 }

Index: linux-2.6.19-rc2-mm2-CA/fs/inode.c
===================================================================
@@ -1217,18 +1217,11 @@
                return;
 
        now = current_fs_time(inode->i_sb);
-       if (!timespec_equal(&inode->i_mtime, &now)) {
-               inode->i_mtime = now;
-               sync_it = 1;
-       }
-
-       if (!timespec_equal(&inode->i_ctime, &now)) {
-               inode->i_ctime = now;
-               sync_it = 1;
-       }
+       inode->i_mtime = now;
+       inode->i_ctime = now;
 
-       if (sync_it)
-               mark_inode_dirty_sync(inode);
+       inode->i_change_attribute++;
+       mark_inode_dirty_sync(inode);
 }
 
 EXPORT_SYMBOL(file_update_time);

Index: linux-2.6.19-rc2-mm2-CA/fs/libfs.c
===================================================================
@@ -220,6 +220,7 @@
        root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
        root->i_uid = root->i_gid = 0;
        root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
+       root->i_change_attribute = 1;
        dentry = d_alloc(NULL, &d_name);
        if (!dentry) {
                iput(root);

@@ -242,6 +243,8 @@
 {
        struct inode *inode = old_dentry->d_inode;
 
+       inode->i_change_attribute++;
+       dir->i_change_attribute++;
        inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
        inc_nlink(inode);
        atomic_inc(&inode->i_count);

@@ -274,6 +277,8 @@
 {
        struct inode *inode = dentry->d_inode;
 
+       inode->i_change_attribute++;
+       dir->i_change_attribute++;
        inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
        drop_nlink(inode);
        dput(dentry);

@@ -312,6 +317,8 @@
        old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
                new_dir->i_mtime = inode->i_ctime = CURRENT_TIME;
 
+       old_dir->i_change_attribute++;
+       new_dir->i_change_attribute++;
        return 0;
 }
 

@@ -380,6 +387,7 @@
        inode->i_uid = inode->i_gid = 0;
        inode->i_blocks = 0;
        inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+       inode->i_change_attribute = 1;
        inode->i_op = &simple_dir_inode_operations;
        inode->i_fop = &simple_dir_operations;
        inode->i_nlink = 2;

@@ -401,6 +409,7 @@
                inode->i_uid = inode->i_gid = 0;
                inode->i_blocks = 0;
                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+               inode->i_change_attribute = 1;
                inode->i_fop = files->ops;
                inode->i_ino = i;
                d_add(dentry, inode);

Index: linux-2.6.19-rc2-mm2-CA/fs/pipe.c
===================================================================
@@ -864,6 +864,7 @@
        inode->i_uid = current->fsuid;
        inode->i_gid = current->fsgid;
        inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+       inode->i_change_attribute = 1;
 
        return inode;
 

Index: linux-2.6.19-rc2-mm2-CA/include/linux/fs.h
===================================================================
@@ -323,6 +323,7 @@
 #define ATTR_KILL_SUID 2048
 #define ATTR_KILL_SGID 4096
 #define ATTR_FILE      8192
+#define ATTR_CHANGE_ATTRIBUTE  16384
 
 /*
  * This is the Inode Attributes structure, used for notify_change().  It

@@ -342,6 +343,7 @@
        struct timespec ia_atime;
        struct timespec ia_mtime;
        struct timespec ia_ctime;
+       unsigned long   ia_change_attribute;
 
        /*
         * Not an attribute, but an auxilary info for filesystems wanting to

@@ -538,6 +540,7 @@
        struct timespec         i_atime;
        struct timespec         i_mtime;
        struct timespec         i_ctime;
+       unsigned long           i_change_attribute;
        unsigned int            i_blkbits;
        unsigned long           i_version;
        blkcnt_t                i_blocks;