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nilfs2: split out nilfs_attach_snapshot 

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

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-08-26 02:15:41 +09:00
parent 367ea33486
commit ab4d8f7ebf
1 changed files with 44 additions and 27 deletions
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71
fs/nilfs2/super.c
View File

@ -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); if (nilfs_test_opt(sbi, SNAPSHOT)) {
curr_mnt = true; err = nilfs_attach_snapshot(sb, sbi->s_snapshot_cno,
&sb->s_root);
if (err)
goto failed_sbi;
if (sb->s_flags & MS_RDONLY) { goto add_to_supers;
if (nilfs_test_opt(sbi, SNAPSHOT)) {
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
sbi->s_snapshot_cno);
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;
}
cno = sbi->s_snapshot_cno;
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))