From 4bbcaa648d23470f04285c52a27d87c8fe906203 Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Fri, 1 Aug 2014 18:12:45 -0500 Subject: [PATCH] btrfs: factor btrfs_read_roots() out of open_ctree() Also, remove the two local variables create_uuid_tree and check_uuid_tree; we can use the existence of the uuid root and/or the RESCAN_UUID_TREE flag to determine what action to take. Signed-off-by: Eric Sandeen Signed-off-by: David Sterba --- fs/btrfs/disk-io.c | 131 +++++++++++++++++++++++---------------------- 1 file changed, 66 insertions(+), 65 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 954f0658dd0e..c7546d6512cc 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2354,6 +2354,65 @@ static int btrfs_replay_log(struct btrfs_fs_info *fs_info, return 0; } +static int btrfs_read_roots(struct btrfs_fs_info *fs_info, + struct btrfs_root *tree_root) +{ + struct btrfs_root *extent_root; + struct btrfs_root *dev_root; + struct btrfs_root *csum_root; + struct btrfs_root *quota_root; + struct btrfs_root *uuid_root; + struct btrfs_key location; + int ret; + + location.objectid = BTRFS_EXTENT_TREE_OBJECTID; + location.type = BTRFS_ROOT_ITEM_KEY; + location.offset = 0; + + extent_root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(extent_root)) + return PTR_ERR(extent_root); + set_bit(BTRFS_ROOT_TRACK_DIRTY, &extent_root->state); + fs_info->extent_root = extent_root; + + location.objectid = BTRFS_DEV_TREE_OBJECTID; + dev_root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(dev_root)) + return PTR_ERR(dev_root); + set_bit(BTRFS_ROOT_TRACK_DIRTY, &dev_root->state); + fs_info->dev_root = dev_root; + btrfs_init_devices_late(fs_info); + + location.objectid = BTRFS_CSUM_TREE_OBJECTID; + csum_root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(csum_root)) + return PTR_ERR(csum_root); + set_bit(BTRFS_ROOT_TRACK_DIRTY, &csum_root->state); + fs_info->csum_root = csum_root; + + location.objectid = BTRFS_QUOTA_TREE_OBJECTID; + quota_root = btrfs_read_tree_root(tree_root, &location); + if (!IS_ERR(quota_root)) { + set_bit(BTRFS_ROOT_TRACK_DIRTY, "a_root->state); + fs_info->quota_enabled = 1; + fs_info->pending_quota_state = 1; + fs_info->quota_root = quota_root; + } + + location.objectid = BTRFS_UUID_TREE_OBJECTID; + uuid_root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(uuid_root)) { + ret = PTR_ERR(uuid_root); + if (ret != -ENOENT) + return ret; + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &uuid_root->state); + fs_info->uuid_root = uuid_root; + } + + return 0; +} + int open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices, char *options) @@ -2368,19 +2427,12 @@ int open_ctree(struct super_block *sb, struct btrfs_super_block *disk_super; struct btrfs_fs_info *fs_info = btrfs_sb(sb); struct btrfs_root *tree_root; - struct btrfs_root *extent_root; - struct btrfs_root *csum_root; struct btrfs_root *chunk_root; - struct btrfs_root *dev_root; - struct btrfs_root *quota_root; - struct btrfs_root *uuid_root; int ret; int err = -EINVAL; int num_backups_tried = 0; int backup_index = 0; int max_active; - bool create_uuid_tree; - bool check_uuid_tree; tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); @@ -2804,61 +2856,9 @@ retry_root_backup: tree_root->commit_root = btrfs_root_node(tree_root); btrfs_set_root_refs(&tree_root->root_item, 1); - location.objectid = BTRFS_EXTENT_TREE_OBJECTID; - location.type = BTRFS_ROOT_ITEM_KEY; - location.offset = 0; - - extent_root = btrfs_read_tree_root(tree_root, &location); - if (IS_ERR(extent_root)) { - ret = PTR_ERR(extent_root); + ret = btrfs_read_roots(fs_info, tree_root); + if (ret) goto recovery_tree_root; - } - set_bit(BTRFS_ROOT_TRACK_DIRTY, &extent_root->state); - fs_info->extent_root = extent_root; - - location.objectid = BTRFS_DEV_TREE_OBJECTID; - dev_root = btrfs_read_tree_root(tree_root, &location); - if (IS_ERR(dev_root)) { - ret = PTR_ERR(dev_root); - goto recovery_tree_root; - } - set_bit(BTRFS_ROOT_TRACK_DIRTY, &dev_root->state); - fs_info->dev_root = dev_root; - btrfs_init_devices_late(fs_info); - - location.objectid = BTRFS_CSUM_TREE_OBJECTID; - csum_root = btrfs_read_tree_root(tree_root, &location); - if (IS_ERR(csum_root)) { - ret = PTR_ERR(csum_root); - goto recovery_tree_root; - } - set_bit(BTRFS_ROOT_TRACK_DIRTY, &csum_root->state); - fs_info->csum_root = csum_root; - - location.objectid = BTRFS_QUOTA_TREE_OBJECTID; - quota_root = btrfs_read_tree_root(tree_root, &location); - if (!IS_ERR(quota_root)) { - set_bit(BTRFS_ROOT_TRACK_DIRTY, "a_root->state); - fs_info->quota_enabled = 1; - fs_info->pending_quota_state = 1; - fs_info->quota_root = quota_root; - } - - location.objectid = BTRFS_UUID_TREE_OBJECTID; - uuid_root = btrfs_read_tree_root(tree_root, &location); - if (IS_ERR(uuid_root)) { - ret = PTR_ERR(uuid_root); - if (ret != -ENOENT) - goto recovery_tree_root; - create_uuid_tree = true; - check_uuid_tree = false; - } else { - set_bit(BTRFS_ROOT_TRACK_DIRTY, &uuid_root->state); - fs_info->uuid_root = uuid_root; - create_uuid_tree = false; - check_uuid_tree = - generation != btrfs_super_uuid_tree_generation(disk_super); - } fs_info->generation = generation; fs_info->last_trans_committed = generation; @@ -2896,7 +2896,7 @@ retry_root_backup: goto fail_sysfs; } - ret = btrfs_read_block_groups(extent_root); + ret = btrfs_read_block_groups(fs_info->extent_root); if (ret) { printk(KERN_ERR "BTRFS: Failed to read block groups: %d\n", ret); goto fail_sysfs; @@ -3019,7 +3019,7 @@ retry_root_backup: btrfs_qgroup_rescan_resume(fs_info); - if (create_uuid_tree) { + if (!fs_info->uuid_root) { pr_info("BTRFS: creating UUID tree\n"); ret = btrfs_create_uuid_tree(fs_info); if (ret) { @@ -3028,8 +3028,9 @@ retry_root_backup: close_ctree(tree_root); return ret; } - } else if (check_uuid_tree || - btrfs_test_opt(tree_root, RESCAN_UUID_TREE)) { + } else if (btrfs_test_opt(tree_root, RESCAN_UUID_TREE) || + fs_info->generation != + btrfs_super_uuid_tree_generation(disk_super)) { pr_info("BTRFS: checking UUID tree\n"); ret = btrfs_check_uuid_tree(fs_info); if (ret) {