nilfs2: simplify life cycle management of nilfs object
This stops pre-allocating nilfs object in nilfs_get_sb routine, and
stops managing its life cycle by reference counting.
nilfs_find_or_create_nilfs() function, nilfs->ns_mount_mutex,
nilfs_objects list, and the reference counter will be removed through
the simplification.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 2e58e7c..5893cb2 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -356,7 +356,7 @@
up_write(&nilfs->ns_sem);
}
- put_nilfs(sbi->s_nilfs);
+ destroy_nilfs(nilfs);
sbi->s_super = NULL;
sb->s_fs_info = NULL;
kfree(sbi);
@@ -836,15 +836,14 @@
* @sb: super_block
* @data: mount options
* @silent: silent mode flag
- * @nilfs: the_nilfs struct
*
* This function is called exclusively by nilfs->ns_mount_mutex.
* So, the recovery process is protected from other simultaneous mounts.
*/
static int
-nilfs_fill_super(struct super_block *sb, void *data, int silent,
- struct the_nilfs *nilfs)
+nilfs_fill_super(struct super_block *sb, void *data, int silent)
{
+ struct the_nilfs *nilfs;
struct nilfs_sb_info *sbi;
struct nilfs_root *fsroot;
__u64 cno;
@@ -855,14 +854,18 @@
return -ENOMEM;
sb->s_fs_info = sbi;
-
- get_nilfs(nilfs);
- sbi->s_nilfs = nilfs;
sbi->s_super = sb;
+ nilfs = alloc_nilfs(sb->s_bdev);
+ if (!nilfs) {
+ err = -ENOMEM;
+ goto failed_sbi;
+ }
+ sbi->s_nilfs = nilfs;
+
err = init_nilfs(nilfs, sbi, (char *)data);
if (err)
- goto failed_sbi;
+ goto failed_nilfs;
spin_lock_init(&sbi->s_inode_lock);
INIT_LIST_HEAD(&sbi->s_dirty_files);
@@ -885,14 +888,14 @@
err = load_nilfs(nilfs, sbi);
if (err)
- goto failed_sbi;
+ goto failed_nilfs;
cno = nilfs_last_cno(nilfs);
err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);
if (err) {
printk(KERN_ERR "NILFS: error loading last checkpoint "
"(checkpoint number=%llu).\n", (unsigned long long)cno);
- goto failed_sbi;
+ goto failed_nilfs;
}
if (!(sb->s_flags & MS_RDONLY)) {
@@ -921,8 +924,10 @@
failed_checkpoint:
nilfs_put_root(fsroot);
+ failed_nilfs:
+ destroy_nilfs(nilfs);
+
failed_sbi:
- put_nilfs(nilfs);
sb->s_fs_info = NULL;
kfree(sbi);
return err;
@@ -1077,7 +1082,6 @@
struct nilfs_super_data sd;
struct super_block *s;
fmode_t mode = FMODE_READ;
- struct the_nilfs *nilfs;
struct dentry *root_dentry;
int err, s_new = false;
@@ -1095,18 +1099,10 @@
goto failed;
}
- nilfs = find_or_create_nilfs(sd.bdev);
- if (!nilfs) {
- err = -ENOMEM;
- goto failed;
- }
-
- mutex_lock(&nilfs->ns_mount_mutex);
-
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
if (IS_ERR(s)) {
err = PTR_ERR(s);
- goto failed_unlock;
+ goto failed;
}
if (!s->s_root) {
@@ -1120,10 +1116,9 @@
strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
sb_set_blocksize(s, block_size(sd.bdev));
- err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0,
- nilfs);
+ err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
if (err)
- goto cancel_new;
+ goto failed_super;
s->s_flags |= MS_ACTIVE;
} else if (!sd.cno) {
@@ -1153,17 +1148,12 @@
if (sd.cno) {
err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
- if (err) {
- if (s_new)
- goto cancel_new;
+ if (err)
goto failed_super;
- }
} else {
root_dentry = dget(s->s_root);
}
- mutex_unlock(&nilfs->ns_mount_mutex);
- put_nilfs(nilfs);
if (!s_new)
close_bdev_exclusive(sd.bdev, mode);
@@ -1173,23 +1163,10 @@
failed_super:
deactivate_locked_super(s);
- failed_unlock:
- mutex_unlock(&nilfs->ns_mount_mutex);
- put_nilfs(nilfs);
- failed:
- close_bdev_exclusive(sd.bdev, mode);
- return err;
- cancel_new:
- /* Abandoning the newly allocated superblock */
- mutex_unlock(&nilfs->ns_mount_mutex);
- put_nilfs(nilfs);
- deactivate_locked_super(s);
- /*
- * This deactivate_locked_super() invokes close_bdev_exclusive().
- * We must finish all post-cleaning before this call;
- * put_nilfs() needs the block device.
- */
+ failed:
+ if (!s_new)
+ close_bdev_exclusive(sd.bdev, mode);
return err;
}