ubifs: split allocation of ubifs_info into a separate function

preparation to ubifs sget() race fixes

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index b5aeb5a8ebed11f0448c8ff8ed20db57b5178a69..ddc3b02e8cf096bbdba031932feee6f5c5ddb06b 100644 (file)
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1971,6 +1971,53 @@ static struct ubi_volume_desc *open_ubi(const char *name, int mode)
        return ERR_PTR(-EINVAL);
 }
 
+static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
+{
+       struct ubifs_info *c;
+
+       c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
+       if (c) {
+               spin_lock_init(&c->cnt_lock);
+               spin_lock_init(&c->cs_lock);
+               spin_lock_init(&c->buds_lock);
+               spin_lock_init(&c->space_lock);
+               spin_lock_init(&c->orphan_lock);
+               init_rwsem(&c->commit_sem);
+               mutex_init(&c->lp_mutex);
+               mutex_init(&c->tnc_mutex);
+               mutex_init(&c->log_mutex);
+               mutex_init(&c->mst_mutex);
+               mutex_init(&c->umount_mutex);
+               mutex_init(&c->bu_mutex);
+               mutex_init(&c->write_reserve_mutex);
+               init_waitqueue_head(&c->cmt_wq);
+               c->buds = RB_ROOT;
+               c->old_idx = RB_ROOT;
+               c->size_tree = RB_ROOT;
+               c->orph_tree = RB_ROOT;
+               INIT_LIST_HEAD(&c->infos_list);
+               INIT_LIST_HEAD(&c->idx_gc);
+               INIT_LIST_HEAD(&c->replay_list);
+               INIT_LIST_HEAD(&c->replay_buds);
+               INIT_LIST_HEAD(&c->uncat_list);
+               INIT_LIST_HEAD(&c->empty_list);
+               INIT_LIST_HEAD(&c->freeable_list);
+               INIT_LIST_HEAD(&c->frdi_idx_list);
+               INIT_LIST_HEAD(&c->unclean_leb_list);
+               INIT_LIST_HEAD(&c->old_buds);
+               INIT_LIST_HEAD(&c->orph_list);
+               INIT_LIST_HEAD(&c->orph_new);
+               c->no_chk_data_crc = 1;
+
+               c->highest_inum = UBIFS_FIRST_INO;
+               c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
+
+               ubi_get_volume_info(ubi, &c->vi);
+               ubi_get_device_info(c->vi.ubi_num, &c->di);
+       }
+       return c;
+}
+
 static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
 {
        struct ubi_volume_desc *ubi = sb->s_fs_info;
@@ -1978,49 +2025,11 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
        struct inode *root;
        int err;
 
-       c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
+       c = alloc_ubifs_info(ubi);
        if (!c)
                return -ENOMEM;
 
-       spin_lock_init(&c->cnt_lock);
-       spin_lock_init(&c->cs_lock);
-       spin_lock_init(&c->buds_lock);
-       spin_lock_init(&c->space_lock);
-       spin_lock_init(&c->orphan_lock);
-       init_rwsem(&c->commit_sem);
-       mutex_init(&c->lp_mutex);
-       mutex_init(&c->tnc_mutex);
-       mutex_init(&c->log_mutex);
-       mutex_init(&c->mst_mutex);
-       mutex_init(&c->umount_mutex);
-       mutex_init(&c->bu_mutex);
-       mutex_init(&c->write_reserve_mutex);
-       init_waitqueue_head(&c->cmt_wq);
-       c->buds = RB_ROOT;
-       c->old_idx = RB_ROOT;
-       c->size_tree = RB_ROOT;
-       c->orph_tree = RB_ROOT;
-       INIT_LIST_HEAD(&c->infos_list);
-       INIT_LIST_HEAD(&c->idx_gc);
-       INIT_LIST_HEAD(&c->replay_list);
-       INIT_LIST_HEAD(&c->replay_buds);
-       INIT_LIST_HEAD(&c->uncat_list);
-       INIT_LIST_HEAD(&c->empty_list);
-       INIT_LIST_HEAD(&c->freeable_list);
-       INIT_LIST_HEAD(&c->frdi_idx_list);
-       INIT_LIST_HEAD(&c->unclean_leb_list);
-       INIT_LIST_HEAD(&c->old_buds);
-       INIT_LIST_HEAD(&c->orph_list);
-       INIT_LIST_HEAD(&c->orph_new);
-       c->no_chk_data_crc = 1;
-
        c->vfs_sb = sb;
-       c->highest_inum = UBIFS_FIRST_INO;
-       c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
-
-       ubi_get_volume_info(ubi, &c->vi);
-       ubi_get_device_info(c->vi.ubi_num, &c->di);
-
        /* Re-open the UBI device in read-write mode */
        c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
        if (IS_ERR(c->ubi)) {