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btrfs-progs: tune: implement the prerequisite checks for csum change 

The overall idea is to make sure no running operations (balance,
dev-replace, dirty log) for the fs before csum change.

And also reject half converted csums for now.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2023-05-18 10:10:40 +08:00 committed by David Sterba
parent 33a21e7578
commit 7dd3cda377
1 changed files with 59 additions and 0 deletions
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59
tune/change-csum.c
View File

@ -26,9 +26,68 @@
#include "common/internal.h"
#include "tune/tune.h"
static int check_csum_change_requreiment(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *dev_root = fs_info->dev_root;
struct btrfs_path path = { 0 };
struct btrfs_key key;
int ret;
if (btrfs_super_log_root(fs_info->super_copy)) {
error("dirty log tree detected, please replay the log or zero it.");
return -EINVAL;
}
if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
error("no csum change support for extent-tree-v2 feature yet.");
return -EOPNOTSUPP;
}
if (btrfs_super_flags(fs_info->super_copy) &
(BTRFS_SUPER_FLAG_CHANGING_DATA_CSUM |
BTRFS_SUPER_FLAG_CHANGING_META_CSUM)) {
error("resume from half converted status is not yet supported");
return -EOPNOTSUPP;
}
key.objectid = BTRFS_BALANCE_OBJECTID;
key.type = BTRFS_TEMPORARY_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0);
btrfs_release_path(&path);
if (ret < 0) {
errno = -ret;
error("failed to check the balance status: %m");
return ret;
}
if (ret == 0) {
error("running balance detected, please finish or cancel it.");
return -EINVAL;
}
key.objectid = 0;
key.type = BTRFS_DEV_REPLACE_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0);
btrfs_release_path(&path);
if (ret < 0) {
errno = -ret;
error("failed to check the dev-reaplce status: %m");
return ret;
}
if (ret == 0) {
error("running dev-replace detected, please finish or cancel it.");
return -EINVAL;
}
return 0;
}
int btrfs_change_csum_type(struct btrfs_fs_info *fs_info, u16 new_csum_type)
{
int ret;
/* Phase 0, check conflicting features. */
ret = check_csum_change_requreiment(fs_info);
if (ret < 0)
return ret;
/*
* Phase 1, generate new data csums.