nilfs2: move next generation counter into nilfs object

Moves s_next_generation counter and a spinlock protecting it to nilfs
object from nilfs_sb_info structure.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

5 files changed, 15 insertions, 19 deletions

diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index dd5d6d633ea1..7a3dbe4f229c 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -295,7 +295,7 @@ const struct address_space_operations nilfs_aops = {
 struct inode *nilfs_new_inode(struct inode *dir, int mode)
 {
         struct super_block *sb = dir->i_sb;
-        struct nilfs_sb_info *sbi = NILFS_SB(sb);
+        struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
         struct inode *inode;
         struct nilfs_inode_info *ii;
         struct nilfs_root *root;
@@ -340,9 +340,9 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode)
         /* ii->i_dir_acl = 0; */
         ii->i_dir_start_lookup = 0;
         nilfs_set_inode_flags(inode);
-        spin_lock(&sbi->s_next_gen_lock);
-        inode->i_generation = sbi->s_next_generation++;
-        spin_unlock(&sbi->s_next_gen_lock);
+        spin_lock(&nilfs->ns_next_gen_lock);
+        inode->i_generation = nilfs->ns_next_generation++;
+        spin_unlock(&nilfs->ns_next_gen_lock);
         insert_inode_hash(inode);
 
         err = nilfs_init_acl(inode, dir);
diff --git a/fs/nilfs2/sb.h b/fs/nilfs2/sb.h
index 3232e75fab75..6f190dfdc649 100644
--- a/fs/nilfs2/sb.h
+++ b/fs/nilfs2/sb.h
@@ -40,10 +40,6 @@ struct nilfs_sb_info {
 
         /* Segment constructor */
         struct nilfs_sc_info *s_sc_info; /* segment constructor info */
-
-        /* Inode allocator */
-        spinlock_t s_next_gen_lock;
-        u32 s_next_generation;
 };
 
 static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb)
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 6dc8b3cad127..1368c4293c7f 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -43,7 +43,6 @@
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/parser.h>
-#include <linux/random.h>
 #include <linux/crc32.h>
 #include <linux/vfs.h>
 #include <linux/writeback.h>
@@ -943,16 +942,6 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent)
         if (err)
                 goto failed_nilfs;
 
-        /*
-         * Following initialization is overlapped because
-         * nilfs_sb_info structure has been cleared at the beginning.
-         * But we reserve them to keep our interest and make ready
-         * for the future change.
-         */
-        get_random_bytes(&sbi->s_next_generation,
-                         sizeof(sbi->s_next_generation));
-        spin_lock_init(&sbi->s_next_gen_lock);
-
         sb->s_op = &nilfs_sops;
         sb->s_export_op = &nilfs_export_ops;
         sb->s_root = NULL;
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 40239a932dec..1bf695e887a7 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/blkdev.h>
 #include <linux/backing-dev.h>
+#include <linux/random.h>
 #include <linux/crc32.h>
 #include "nilfs.h"
 #include "segment.h"
@@ -78,6 +79,7 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev)
         INIT_LIST_HEAD(&nilfs->ns_dirty_files);
         INIT_LIST_HEAD(&nilfs->ns_gc_inodes);
         spin_lock_init(&nilfs->ns_inode_lock);
+        spin_lock_init(&nilfs->ns_next_gen_lock);
         spin_lock_init(&nilfs->ns_last_segment_lock);
         nilfs->ns_cptree = RB_ROOT;
         spin_lock_init(&nilfs->ns_cptree_lock);
@@ -593,6 +595,9 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
         nilfs->ns_blocksize_bits = sb->s_blocksize_bits;
         nilfs->ns_blocksize = blocksize;
 
+        get_random_bytes(&nilfs->ns_next_generation,
+                         sizeof(nilfs->ns_next_generation));
+
         err = nilfs_store_disk_layout(nilfs, sbp);
         if (err)
                 goto failed_sbh;
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 6106ec5ad89a..3ecc968f2123 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -74,6 +74,8 @@ enum {
  * @ns_dirty_files: list of dirty files
  * @ns_inode_lock: lock protecting @ns_dirty_files
  * @ns_gc_inodes: dummy inodes to keep live blocks
+ * @ns_next_generation: next generation number for inodes
+ * @ns_next_gen_lock: lock protecting @ns_next_generation
  * @ns_mount_opt: mount options
  * @ns_resuid: uid for reserved blocks
  * @ns_resgid: gid for reserved blocks
@@ -159,6 +161,10 @@ struct the_nilfs {
         /* GC inode list */
         struct list_head        ns_gc_inodes;
 
+        /* Inode allocator */
+        u32                     ns_next_generation;
+        spinlock_t              ns_next_gen_lock;
+
         /* Mount options */
         unsigned long           ns_mount_opt;