diff options
Diffstat (limited to 'fs/nilfs2/super.c')
| -rw-r--r-- | fs/nilfs2/super.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 39e7d7f8eda0..ab96d26bf7e9 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -833,6 +833,38 @@ static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) return nilfs_tree_was_touched(root_dentry); } +int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) +{ + struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; + struct nilfs_root *root; + struct inode *inode; + struct dentry *dentry; + int ret; + + if (cno < 0 || cno > nilfs->ns_cno) + return false; + + if (cno >= nilfs_last_cno(nilfs)) + return true; /* protect recent checkpoints */ + + ret = false; + root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); + if (root) { + inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); + if (inode) { + dentry = d_find_alias(inode); + if (dentry) { + if (nilfs_tree_was_touched(dentry)) + ret = nilfs_try_to_shrink_tree(dentry); + dput(dentry); + } + iput(inode); + } + nilfs_put_root(root); + } + return ret; +} + /** * nilfs_fill_super() - initialize a super block instance * @sb: super_block |