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nilfs2: use checkpoint tree for mount check of snapshots

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This rewrites nilfs_checkpoint_is_mounted() function so that it
decides whether a checkpoint is mounted by whether the corresponding
root object is found in checkpoint tree.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-08-14 21:44:51 +09:00
parent b7c0634204
commit fd52202930
1 changed files with 11 additions and 17 deletions
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28
fs/nilfs2/the_nilfs.c
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@ -954,26 +954,20 @@ struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs,
int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno,
int snapshot_mount)
{
struct nilfs_sb_info *sbi;
int ret = 0;
struct nilfs_root *root;
int ret;
down_read(&nilfs->ns_super_sem);
if (cno == 0 || cno > nilfs->ns_cno)
goto out_unlock;
if (cno < 0 || cno > nilfs->ns_cno)
return false;
list_for_each_entry(sbi, &nilfs->ns_supers, s_list) {
if (sbi->s_snapshot_cno == cno &&
(!snapshot_mount || nilfs_test_opt(sbi, SNAPSHOT))) {
/* exclude read-only mounts */
ret++;
break;
}
}
/* for protecting recent checkpoints */
if (cno >= nilfs_last_cno(nilfs))
ret++;
return true; /* protect recent checkpoints */
out_unlock:
up_read(&nilfs->ns_super_sem);
ret = false;
root = nilfs_lookup_root(nilfs, cno);
if (root) {
ret = true;
nilfs_put_root(root);
}
return ret;
}