UBIFS: always set i_generation to 0

UBIFS does not presently re-use inode numbers, so leaving
i_generation zero is most appropriate for now.

Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

fs/ubifs/dir.c

@@ -165,7 +165,6 @@ struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
 	}
 
 	inode->i_ino = ++c->highest_inum;
-	inode->i_generation = ++c->vfs_gen;
 	/*
 	 * The creation sequence number remains with this inode for its
 	 * lifetime. All nodes for this inode have a greater sequence number,

fs/ubifs/super.c

@@ -30,7 +30,6 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
-#include <linux/random.h>
 #include <linux/kthread.h>
 #include <linux/parser.h>
 #include <linux/seq_file.h>
@@ -1671,7 +1670,6 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
 	INIT_LIST_HEAD(&c->orph_new);
 
 	c->highest_inum = UBIFS_FIRST_INO;
-	get_random_bytes(&c->vfs_gen, sizeof(int));
 	c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
 
 	ubi_get_volume_info(ubi, &c->vi);

fs/ubifs/ubifs.h

@@ -876,11 +876,10 @@ struct ubifs_mount_opts {
  * @bdi: backing device info object to make VFS happy and disable read-ahead
  *
  * @highest_inum: highest used inode number
- * @vfs_gen: VFS inode generation counter
  * @max_sqnum: current global sequence number
  * @cmt_no: commit number of the last successfully completed commit, protected
  *          by @commit_sem
- * @cnt_lock: protects @highest_inum, @vfs_gen, and @max_sqnum counters
+ * @cnt_lock: protects @highest_inum and @max_sqnum counters
  * @fmt_version: UBIFS on-flash format version
  * @uuid: UUID from super block
  *
@@ -1117,7 +1116,6 @@ struct ubifs_info {
 	struct backing_dev_info bdi;
 
 	ino_t highest_inum;
-	unsigned int vfs_gen;
 	unsigned long long max_sqnum;
 	unsigned long long cmt_no;
 	spinlock_t cnt_lock;