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Commit ab4d8f7e authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: split out nilfs_attach_snapshot 



This splits the code to attach snapshots into a separate routine for
convenience sake.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent 367ea334

fs/nilfs2/super.c

+45 −28
Original line number Original line Diff line number Diff line
@@ -783,6 +783,40 @@ static int nilfs_get_root_dentry(struct super_block *sb, 
	return ret;

	return ret;

}

}





static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,

				 struct dentry **root_dentry)

{

	struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs;

	struct nilfs_root *root;

	int ret;



	down_read(&nilfs->ns_segctor_sem);

	ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);

	up_read(&nilfs->ns_segctor_sem);

	if (ret < 0) {

		ret = (ret == -ENOENT) ? -EINVAL : ret;

		goto out;

	} else if (!ret) {

		printk(KERN_ERR "NILFS: The specified checkpoint is "

		       "not a snapshot (checkpoint number=%llu).\n",

		       (unsigned long long)cno);

		ret = -EINVAL;

		goto out;

	}



	ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root);

	if (ret) {

		printk(KERN_ERR "NILFS: error loading snapshot "

		       "(checkpoint number=%llu).\n",

	       (unsigned long long)cno);

		goto out;

	}

	ret = nilfs_get_root_dentry(s, root, root_dentry);

	nilfs_put_root(root);

 out:

	return ret;

}



/**

/**

 * nilfs_fill_super() - initialize a super block instance

 * nilfs_fill_super() - initialize a super block instance

 * @sb: super_block

 * @sb: super_block
@@ -800,7 +834,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, 
	struct nilfs_sb_info *sbi;

	struct nilfs_sb_info *sbi;

	struct nilfs_root *fsroot;

	struct nilfs_root *fsroot;

	__u64 cno;

	__u64 cno;

	int err, curr_mnt;

	int err;





	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);

	if (!sbi)

	if (!sbi)
@@ -841,35 +875,17 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, 
	if (err)

	if (err)

		goto failed_sbi;

		goto failed_sbi;





	cno = nilfs_last_cno(nilfs);

	curr_mnt = true;



	if (sb->s_flags & MS_RDONLY) {

	if (nilfs_test_opt(sbi, SNAPSHOT)) {

	if (nilfs_test_opt(sbi, SNAPSHOT)) {

			down_read(&nilfs->ns_segctor_sem);

		err = nilfs_attach_snapshot(sb, sbi->s_snapshot_cno,

			err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,

					    &sb->s_root);

						       sbi->s_snapshot_cno);

		if (err)

			up_read(&nilfs->ns_segctor_sem);

			if (err < 0) {

				if (err == -ENOENT)

					err = -EINVAL;

				goto failed_sbi;

			}

			if (!err) {

				printk(KERN_ERR

				       "NILFS: The specified checkpoint is "

				       "not a snapshot "

				       "(checkpoint number=%llu).\n",

				       (unsigned long long)sbi->s_snapshot_cno);

				err = -EINVAL;

			goto failed_sbi;

			goto failed_sbi;

			}



			cno = sbi->s_snapshot_cno;

		goto add_to_supers;

			curr_mnt = false;

		}

	}

	}





	err = nilfs_attach_checkpoint(sbi, cno, curr_mnt, &fsroot);

	cno = nilfs_last_cno(nilfs);

	err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);

	if (err) {

	if (err) {

		printk(KERN_ERR "NILFS: error loading a checkpoint"

		printk(KERN_ERR "NILFS: error loading a checkpoint"

		       " (checkpoint number=%llu).\n", (unsigned long long)cno);

		       " (checkpoint number=%llu).\n", (unsigned long long)cno);
@@ -894,6 +910,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, 
		up_write(&nilfs->ns_sem);

		up_write(&nilfs->ns_sem);

	}

	}





 add_to_supers:

	down_write(&nilfs->ns_super_sem);

	down_write(&nilfs->ns_super_sem);

	list_add(&sbi->s_list, &nilfs->ns_supers);

	list_add(&sbi->s_list, &nilfs->ns_supers);

	if (!nilfs_test_opt(sbi, SNAPSHOT))

	if (!nilfs_test_opt(sbi, SNAPSHOT))