nilfs2: set pointer to root object in inodes
This puts a pointer to nilfs_root object in the private part of
on-memory inode, and makes nilfs_iget function pick up the inode with
the same root object.
Non-root inodes inherit its nilfs_root object from parent inode. That
of the root inode is allocated through nilfs_attach_checkpoint()
function.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index f3a00a3..a1c0e38 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -391,18 +391,24 @@
return err;
}
-int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
+int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
+ struct nilfs_root **rootp)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
+ struct nilfs_root *root;
struct nilfs_checkpoint *raw_cp;
struct buffer_head *bh_cp;
- int err;
+ int err = -ENOMEM;
+
+ root = nilfs_find_or_create_root(
+ nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
+ if (!root)
+ return err;
down_write(&nilfs->ns_super_sem);
list_add(&sbi->s_list, &nilfs->ns_supers);
up_write(&nilfs->ns_super_sem);
- err = -ENOMEM;
sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size);
if (!sbi->s_ifile)
goto delist;
@@ -428,6 +434,8 @@
atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
+
+ *rootp = root;
return 0;
failed_bh:
@@ -440,6 +448,7 @@
down_write(&nilfs->ns_super_sem);
list_del_init(&sbi->s_list);
up_write(&nilfs->ns_super_sem);
+ nilfs_put_root(root);
return err;
}
@@ -551,12 +560,20 @@
nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
{
struct inode *inode;
+ struct nilfs_root *root;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
ino != NILFS_SKETCH_INO)
return ERR_PTR(-ESTALE);
- inode = nilfs_iget(sb, ino);
+ root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs,
+ NILFS_CPTREE_CURRENT_CNO);
+ if (!root)
+ return ERR_PTR(-ESTALE);
+
+ /* new file handle type is required to export snapshots */
+ inode = nilfs_iget(sb, root, ino);
+ nilfs_put_root(root);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
@@ -815,9 +832,10 @@
struct the_nilfs *nilfs)
{
struct nilfs_sb_info *sbi;
+ struct nilfs_root *fsroot;
struct inode *root;
__u64 cno;
- int err;
+ int err, curr_mnt;
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
@@ -859,6 +877,7 @@
goto failed_sbi;
cno = nilfs_last_cno(nilfs);
+ curr_mnt = true;
if (sb->s_flags & MS_RDONLY) {
if (nilfs_test_opt(sbi, SNAPSHOT)) {
@@ -881,10 +900,11 @@
goto failed_sbi;
}
cno = sbi->s_snapshot_cno;
+ curr_mnt = false;
}
}
- err = nilfs_attach_checkpoint(sbi, cno);
+ err = nilfs_attach_checkpoint(sbi, cno, curr_mnt, &fsroot);
if (err) {
printk(KERN_ERR "NILFS: error loading a checkpoint"
" (checkpoint number=%llu).\n", (unsigned long long)cno);
@@ -897,7 +917,7 @@
goto failed_checkpoint;
}
- root = nilfs_iget(sb, NILFS_ROOT_INO);
+ root = nilfs_iget(sb, fsroot, NILFS_ROOT_INO);
if (IS_ERR(root)) {
printk(KERN_ERR "NILFS: get root inode failed\n");
err = PTR_ERR(root);
@@ -917,6 +937,8 @@
goto failed_segctor;
}
+ nilfs_put_root(fsroot);
+
if (!(sb->s_flags & MS_RDONLY)) {
down_write(&nilfs->ns_sem);
nilfs_setup_super(sbi);
@@ -935,6 +957,7 @@
failed_checkpoint:
nilfs_detach_checkpoint(sbi);
+ nilfs_put_root(fsroot);
failed_sbi:
put_nilfs(nilfs);