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btrfstune.c
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btrfstune.c
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/*
* Copyright (C) 2008 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "kerncompat.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <uuid/uuid.h>
#include "kernel-shared/ctree.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/transaction.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/extent_io.h"
#include "common/defs.h"
#include "common/utils.h"
#include "common/extent-cache.h"
#include "common/open-utils.h"
#include "common/parse-utils.h"
#include "common/device-scan.h"
#include "common/messages.h"
#include "common/string-utils.h"
#include "common/help.h"
#include "common/box.h"
#include "ioctl.h"
static char *device;
static int force = 0;
static int update_seeding_flag(struct btrfs_root *root, int set_flag)
{
struct btrfs_trans_handle *trans;
struct btrfs_super_block *disk_super;
u64 super_flags;
int ret;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_flags(disk_super);
if (set_flag) {
if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
if (force)
return 0;
else
warning("seeding flag is already set on %s",
device);
return 1;
}
if (btrfs_super_log_root(disk_super)) {
error("filesystem with dirty log detected, not setting seed flag");
return 1;
}
super_flags |= BTRFS_SUPER_FLAG_SEEDING;
} else {
if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) {
warning("seeding flag is not set on %s", device);
return 1;
}
super_flags &= ~BTRFS_SUPER_FLAG_SEEDING;
warning("seeding flag cleared on %s", device);
}
trans = btrfs_start_transaction(root, 1);
BUG_ON(IS_ERR(trans));
btrfs_set_super_flags(disk_super, super_flags);
ret = btrfs_commit_transaction(trans, root);
return ret;
}
/*
* Return 0 for no unfinished fsid change.
* Return >0 for unfinished fsid change, and restore unfinished fsid/
* chunk_tree_id into fsid_ret/chunk_id_ret.
*/
static int check_unfinished_fsid_change(struct btrfs_fs_info *fs_info,
uuid_t fsid_ret, uuid_t chunk_id_ret)
{
struct btrfs_root *tree_root = fs_info->tree_root;
u64 flags = btrfs_super_flags(fs_info->super_copy);
if (flags & (BTRFS_SUPER_FLAG_CHANGING_FSID |
BTRFS_SUPER_FLAG_CHANGING_FSID_V2)) {
memcpy(fsid_ret, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
read_extent_buffer(tree_root->node, chunk_id_ret,
btrfs_header_chunk_tree_uuid(tree_root->node),
BTRFS_UUID_SIZE);
return 1;
}
return 0;
}
static int set_metadata_uuid(struct btrfs_root *root, const char *uuid_string)
{
struct btrfs_super_block *disk_super;
uuid_t new_fsid, unused1, unused2;
struct btrfs_trans_handle *trans;
bool new_uuid = true;
u64 incompat_flags;
bool uuid_changed;
u64 super_flags;
int ret;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_flags(disk_super);
incompat_flags = btrfs_super_incompat_flags(disk_super);
uuid_changed = incompat_flags & BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
error("cannot set metadata UUID on a seed device");
return 1;
}
if (check_unfinished_fsid_change(root->fs_info, unused1, unused2)) {
error("UUID rewrite in progress, cannot change fsid");
return 1;
}
if (uuid_string)
uuid_parse(uuid_string, new_fsid);
else
uuid_generate(new_fsid);
new_uuid = (memcmp(new_fsid, disk_super->fsid, BTRFS_FSID_SIZE) != 0);
/* Step 1 sets the in progress flag */
trans = btrfs_start_transaction(root, 1);
super_flags |= BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
btrfs_set_super_flags(disk_super, super_flags);
ret = btrfs_commit_transaction(trans, root);
if (ret < 0)
return ret;
if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
new_fsid, BTRFS_FSID_SIZE) == 0) {
/*
* Changing fsid to be the same as metadata uuid, so just
* disable the flag
*/
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
incompat_flags &= ~BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
btrfs_set_super_incompat_flags(disk_super, incompat_flags);
memset(disk_super->metadata_uuid, 0, BTRFS_FSID_SIZE);
} else if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
new_fsid, BTRFS_FSID_SIZE)) {
/*
* Changing fsid on an already changed FS, in this case we
* only change the fsid and don't touch metadata uuid as it
* has already the correct value
*/
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
} else if (new_uuid && !uuid_changed) {
/*
* First time changing the fsid, copy the fsid to metadata_uuid
*/
incompat_flags |= BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
btrfs_set_super_incompat_flags(disk_super, incompat_flags);
memcpy(disk_super->metadata_uuid, disk_super->fsid,
BTRFS_FSID_SIZE);
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
} else {
/* Setting the same fsid as current, do nothing */
return 0;
}
trans = btrfs_start_transaction(root, 1);
/*
* Step 2 is to write the metadata_uuid, set the incompat flag and
* clear the in progress flag
*/
super_flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
btrfs_set_super_flags(disk_super, super_flags);
/* Then actually copy the metadata uuid and set the incompat bit */
return btrfs_commit_transaction(trans, root);
}
static int delete_csum_items(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root = btrfs_csum_root(fs_info, 0);
struct btrfs_path path;
struct btrfs_key key;
int nr;
int ret;
btrfs_init_path(&path);
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
key.type = BTRFS_EXTENT_CSUM_KEY;
key.offset = 0;
while (1) {
ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
if (ret < 0)
goto out;
nr = btrfs_header_nritems(path.nodes[0]);
if (!nr)
break;
path.slots[0] = 0;
ret = btrfs_del_items(trans, root, &path, 0, nr);
if (ret)
goto out;
btrfs_release_path(&path);
}
ret = 0;
out:
btrfs_release_path(&path);
return ret;
}
static int change_extents_csum(struct btrfs_fs_info *fs_info, int csum_type)
{
struct btrfs_root *root = btrfs_extent_root(fs_info, 0);
struct btrfs_path path;
struct btrfs_key key = {0, 0, 0};
int ret = 0;
btrfs_init_path(&path);
/*
* Here we don't use transaction as it will takes a lot of reserve
* space, and that will make a near-full btrfs unable to change csums
*/
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0)
goto out;
while (1) {
struct btrfs_extent_item *ei;
struct extent_buffer *eb;
u64 flags;
u64 bytenr;
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY)
goto next;
ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_extent_item);
flags = btrfs_extent_flags(path.nodes[0], ei);
if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
goto next;
bytenr = key.objectid;
eb = read_tree_block(fs_info, bytenr, 0);
if (IS_ERR(eb)) {
error("failed to read tree block: %llu", bytenr);
ret = PTR_ERR(eb);
goto out;
}
/* Only rewrite block */
/* printf("CSUM: start %llu\n", eb->start); */
ret = write_tree_block(NULL, fs_info, eb);
free_extent_buffer(eb);
if (ret < 0) {
error("failed to change csum of tree block: %llu", bytenr);
goto out;
}
next:
ret = btrfs_next_item(root, &path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
goto out;
}
}
out:
btrfs_release_path(&path);
return ret;
}
static int change_devices_csum(struct btrfs_root *root, int csum_type)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_path path;
struct btrfs_key key = {0, 0, 0};
int ret = 0;
btrfs_init_path(&path);
/* No transaction again */
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0)
goto out;
while (1) {
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
if (key.type != BTRFS_DEV_ITEM_KEY ||
key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
goto next;
/* Only rewrite block */
ret = write_tree_block(NULL, fs_info, path.nodes[0]);
if (ret < 0)
goto out;
next:
ret = btrfs_next_item(root, &path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
goto out;
}
}
out:
btrfs_release_path(&path);
return ret;
}
static int populate_csum(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, char *buf, u64 start,
u64 len)
{
u64 offset = 0;
u64 sectorsize;
int ret = 0;
while (offset < len) {
sectorsize = fs_info->sectorsize;
ret = read_data_from_disk(fs_info, buf, start + offset,
§orsize, 0);
if (ret)
break;
ret = btrfs_csum_file_block(trans, start + len, start + offset,
buf, sectorsize);
if (ret)
break;
offset += sectorsize;
}
return ret;
}
static int fill_csum_tree_from_extent(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *extent_root = btrfs_extent_root(fs_info, 0);
struct btrfs_trans_handle *trans;
struct btrfs_path path;
struct btrfs_extent_item *ei;
struct extent_buffer *leaf;
char *buf;
struct btrfs_key key;
int ret;
trans = btrfs_start_transaction(extent_root, 1);
if (trans == NULL) {
/* fixme */
printf("cannot start transaction\n");
return -EINVAL;
}
btrfs_init_path(&path);
key.objectid = 0;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
if (ret < 0) {
btrfs_release_path(&path);
return ret;
}
buf = malloc(fs_info->sectorsize);
if (!buf) {
btrfs_release_path(&path);
return -ENOMEM;
}
ret = delete_csum_items(trans, fs_info);
if (ret) {
error("unable to delete all checksum items: %d", ret);
return -EIO;
}
while (1) {
if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) {
ret = btrfs_next_leaf(extent_root, &path);
if (ret < 0)
break;
if (ret) {
ret = 0;
break;
}
}
leaf = path.nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
if (key.type != BTRFS_EXTENT_ITEM_KEY) {
path.slots[0]++;
continue;
}
ei = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_extent_item);
if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
path.slots[0]++;
continue;
}
ret = populate_csum(trans, fs_info, buf, key.objectid, key.offset);
if (ret)
break;
path.slots[0]++;
}
btrfs_release_path(&path);
free(buf);
/* dont' commit if thre's error */
ret = btrfs_commit_transaction(trans, extent_root);
return ret;
}
static int rewrite_checksums(struct btrfs_root *root, int csum_type)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_super_block *disk_super;
struct btrfs_trans_handle *trans;
u64 super_flags;
int ret;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_flags(disk_super);
/* FIXME: Sanity checks */
if (0) {
error("UUID rewrite in progress, cannot change fsid");
return 1;
}
fs_info->force_csum_type = csum_type;
/* Step 1 sets the in progress flag, no other change to the sb */
printf("Set superblock flag CHANGING_CSUM\n");
trans = btrfs_start_transaction(root, 1);
super_flags |= BTRFS_SUPER_FLAG_CHANGING_CSUM;
btrfs_set_super_flags(disk_super, super_flags);
ret = btrfs_commit_transaction(trans, root);
if (ret < 0)
return ret;
/* Change extents first */
printf("Change fsid in extents\n");
ret = change_extents_csum(fs_info, csum_type);
if (ret < 0) {
error("failed to change csum of metadata: %d", ret);
goto out;
}
/* Then devices */
printf("Change csum in chunk tree\n");
ret = change_devices_csum(fs_info->chunk_root, csum_type);
if (ret < 0) {
error("failed to change UUID of devices: %d", ret);
goto out;
}
/* DATA */
printf("Change csum of data blocks\n");
ret = fill_csum_tree_from_extent(fs_info);
if (ret < 0)
goto out;
/* Last, change fsid in super */
ret = write_all_supers(fs_info);
if (ret < 0)
goto out;
/* All checksums done, drop the flag, super block csum will get updated */
printf("Clear superblock flag CHANGING_CSUM\n");
super_flags = btrfs_super_flags(fs_info->super_copy);
super_flags &= ~BTRFS_SUPER_FLAG_CHANGING_CSUM;
btrfs_set_super_flags(fs_info->super_copy, super_flags);
btrfs_set_super_csum_type(disk_super, csum_type);
ret = write_all_supers(fs_info);
printf("Checksum change finished\n");
out:
/* check errors */
return ret;
}
static int set_super_incompat_flags(struct btrfs_root *root, u64 flags)
{
struct btrfs_trans_handle *trans;
struct btrfs_super_block *disk_super;
u64 super_flags;
int ret;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_incompat_flags(disk_super);
super_flags |= flags;
trans = btrfs_start_transaction(root, 1);
BUG_ON(IS_ERR(trans));
btrfs_set_super_incompat_flags(disk_super, super_flags);
ret = btrfs_commit_transaction(trans, root);
return ret;
}
static int change_buffer_header_uuid(struct extent_buffer *eb, uuid_t new_fsid)
{
struct btrfs_fs_info *fs_info = eb->fs_info;
int same_fsid = 1;
int same_chunk_tree_uuid = 1;
int ret;
same_fsid = !memcmp_extent_buffer(eb, new_fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
same_chunk_tree_uuid =
!memcmp_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
BTRFS_UUID_SIZE);
if (same_fsid && same_chunk_tree_uuid)
return 0;
if (!same_fsid)
write_extent_buffer(eb, new_fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
if (!same_chunk_tree_uuid)
write_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
BTRFS_UUID_SIZE);
ret = write_tree_block(NULL, fs_info, eb);
return ret;
}
static int change_extents_uuid(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
{
struct btrfs_root *root = btrfs_extent_root(fs_info, 0);
struct btrfs_path path;
struct btrfs_key key = {0, 0, 0};
int ret = 0;
btrfs_init_path(&path);
/*
* Here we don't use transaction as it will takes a lot of reserve
* space, and that will make a near-full btrfs unable to change uuid
*/
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0)
goto out;
while (1) {
struct btrfs_extent_item *ei;
struct extent_buffer *eb;
u64 flags;
u64 bytenr;
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY)
goto next;
ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_extent_item);
flags = btrfs_extent_flags(path.nodes[0], ei);
if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
goto next;
bytenr = key.objectid;
eb = read_tree_block(fs_info, bytenr, 0);
if (IS_ERR(eb)) {
error("failed to read tree block: %llu", bytenr);
ret = PTR_ERR(eb);
goto out;
}
ret = change_buffer_header_uuid(eb, new_fsid);
free_extent_buffer(eb);
if (ret < 0) {
error("failed to change uuid of tree block: %llu",
bytenr);
goto out;
}
next:
ret = btrfs_next_item(root, &path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
goto out;
}
}
out:
btrfs_release_path(&path);
return ret;
}
static int change_device_uuid(struct extent_buffer *eb, int slot,
uuid_t new_fsid)
{
struct btrfs_dev_item *di;
struct btrfs_fs_info *fs_info = eb->fs_info;
int ret = 0;
di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
if (!memcmp_extent_buffer(eb, new_fsid,
(unsigned long)btrfs_device_fsid(di),
BTRFS_FSID_SIZE))
return ret;
write_extent_buffer(eb, new_fsid, (unsigned long)btrfs_device_fsid(di),
BTRFS_FSID_SIZE);
ret = write_tree_block(NULL, fs_info, eb);
return ret;
}
static int change_devices_uuid(struct btrfs_root *root, uuid_t new_fsid)
{
struct btrfs_path path;
struct btrfs_key key = {0, 0, 0};
int ret = 0;
btrfs_init_path(&path);
/* No transaction again */
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0)
goto out;
while (1) {
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
if (key.type != BTRFS_DEV_ITEM_KEY ||
key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
goto next;
ret = change_device_uuid(path.nodes[0], path.slots[0],
new_fsid);
if (ret < 0)
goto out;
next:
ret = btrfs_next_item(root, &path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
goto out;
}
}
out:
btrfs_release_path(&path);
return ret;
}
static int change_fsid_prepare(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
{
struct btrfs_root *tree_root = fs_info->tree_root;
u64 flags = btrfs_super_flags(fs_info->super_copy);
int ret = 0;
flags |= BTRFS_SUPER_FLAG_CHANGING_FSID;
btrfs_set_super_flags(fs_info->super_copy, flags);
memcpy(fs_info->super_copy->fsid, new_fsid, BTRFS_FSID_SIZE);
ret = write_all_supers(fs_info);
if (ret < 0)
return ret;
/* Also need to change the metadatauuid of the fs info */
memcpy(fs_info->fs_devices->metadata_uuid, new_fsid, BTRFS_FSID_SIZE);
/* also restore new chunk_tree_id into tree_root for restore */
write_extent_buffer(tree_root->node, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(tree_root->node),
BTRFS_UUID_SIZE);
return write_tree_block(NULL, fs_info, tree_root->node);
}
static int change_fsid_done(struct btrfs_fs_info *fs_info)
{
u64 flags = btrfs_super_flags(fs_info->super_copy);
flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID;
btrfs_set_super_flags(fs_info->super_copy, flags);
return write_all_supers(fs_info);
}
/*
* Change fsid of a given fs.
*
* If new_fsid_str is not given, use a random generated UUID.
* Caller should check new_fsid_str is valid
*/
static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
{
uuid_t new_fsid;
uuid_t new_chunk_id;
uuid_t old_fsid;
char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
int ret = 0;
if (check_unfinished_fsid_change(fs_info, new_fsid, new_chunk_id)) {
if (new_fsid_str) {
uuid_t tmp;
uuid_parse(new_fsid_str, tmp);
if (memcmp(tmp, new_fsid, BTRFS_FSID_SIZE)) {
error(
"new fsid %s is not the same with unfinished fsid change",
new_fsid_str);
return -EINVAL;
}
}
} else {
if (new_fsid_str)
uuid_parse(new_fsid_str, new_fsid);
else
uuid_generate(new_fsid);
uuid_generate(new_chunk_id);
}
fs_info->new_chunk_tree_uuid = new_chunk_id;
memcpy(old_fsid, (const char*)fs_info->fs_devices->fsid, BTRFS_UUID_SIZE);
uuid_unparse(old_fsid, uuid_buf);
printf("Current fsid: %s\n", uuid_buf);
uuid_unparse(new_fsid, uuid_buf);
printf("New fsid: %s\n", uuid_buf);
/* Now we can begin fsid change */
printf("Set superblock flag CHANGING_FSID\n");
ret = change_fsid_prepare(fs_info, new_fsid);
if (ret < 0)
goto out;
/* Change extents first */
printf("Change fsid in extents\n");
ret = change_extents_uuid(fs_info, new_fsid);
if (ret < 0) {
error("failed to change UUID of metadata: %d", ret);
goto out;
}
/* Then devices */
printf("Change fsid on devices\n");
ret = change_devices_uuid(fs_info->chunk_root, new_fsid);
if (ret < 0) {
error("failed to change UUID of devices: %d", ret);
goto out;
}
/* Last, change fsid in super */
memcpy(fs_info->fs_devices->fsid, new_fsid, BTRFS_FSID_SIZE);
memcpy(fs_info->super_copy->fsid, new_fsid, BTRFS_FSID_SIZE);
ret = write_all_supers(fs_info);
if (ret < 0)
goto out;
/* Now fsid change is done */
printf("Clear superblock flag CHANGING_FSID\n");
ret = change_fsid_done(fs_info);
fs_info->new_chunk_tree_uuid = NULL;
printf("Fsid change finished\n");
out:
return ret;
}
/* After this many block groups we need to commit transaction. */
#define BLOCK_GROUP_BATCH 64
static int convert_to_bg_tree(struct btrfs_fs_info *fs_info)
{
struct btrfs_super_block *sb = fs_info->super_copy;
struct btrfs_trans_handle *trans;
struct cache_extent *ce;
int converted_bgs = 0;
int ret;
trans = btrfs_start_transaction(fs_info->tree_root, 2);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
errno = -ret;
error_msg(ERROR_MSG_START_TRANS, "%m");
return ret;
}
/* Set NO_HOLES feature */
btrfs_set_super_incompat_flags(sb, btrfs_super_incompat_flags(sb) |
BTRFS_FEATURE_INCOMPAT_NO_HOLES);
/* We're resuming from previous run. */
if (btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_CHANGING_BG_TREE)
goto iterate_bgs;
ret = btrfs_create_root(trans, fs_info,
BTRFS_BLOCK_GROUP_TREE_OBJECTID);
if (ret < 0) {
error("failed to create block group root: %d", ret);
goto error;
}
btrfs_set_super_flags(sb,
btrfs_super_flags(sb) |
BTRFS_SUPER_FLAG_CHANGING_BG_TREE);
fs_info->last_converted_bg_bytenr = (u64)-1;
/* Now commit the transaction to make above changes to reach disks. */
ret = btrfs_commit_transaction(trans, fs_info->tree_root);
if (ret < 0) {
error_msg(ERROR_MSG_COMMIT_TRANS, "new bg root: %d", ret);
goto error;
}
trans = btrfs_start_transaction(fs_info->tree_root, 2);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
errno = -ret;
error_msg(ERROR_MSG_START_TRANS, "%m");
return ret;
}
iterate_bgs:
if (fs_info->last_converted_bg_bytenr == (u64)-1) {
ce = last_cache_extent(&fs_info->mapping_tree.cache_tree);
} else {
ce = search_cache_extent(&fs_info->mapping_tree.cache_tree,
fs_info->last_converted_bg_bytenr);
if (!ce) {
error("failed to find block group for bytenr %llu",
fs_info->last_converted_bg_bytenr);
ret = -ENOENT;
goto error;
}
ce = prev_cache_extent(ce);
if (!ce) {
error("no more block group before bytenr %llu",
fs_info->last_converted_bg_bytenr);
ret = -ENOENT;
goto error;
}
}
/* Now convert each block */
while (ce) {
struct cache_extent *prev = prev_cache_extent(ce);
u64 bytenr = ce->start;
ret = btrfs_convert_one_bg(trans, bytenr);
if (ret < 0)
goto error;
converted_bgs++;
ce = prev;
if (converted_bgs % BLOCK_GROUP_BATCH == 0) {
ret = btrfs_commit_transaction(trans,
fs_info->tree_root);
if (ret < 0) {
errno = -ret;
error_msg(ERROR_MSG_COMMIT_TRANS, "%m");
return ret;
}
trans = btrfs_start_transaction(fs_info->tree_root, 2);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
errno = -ret;
error_msg(ERROR_MSG_START_TRANS, "%m");
return ret;
}
}
}
/*
* All bgs converted, remove the CHANGING_BG flag and set the compat ro
* flag.
*/
fs_info->last_converted_bg_bytenr = 0;
btrfs_set_super_flags(sb,
btrfs_super_flags(sb) &
~BTRFS_SUPER_FLAG_CHANGING_BG_TREE);
btrfs_set_super_compat_ro_flags(sb,
btrfs_super_compat_ro_flags(sb) |
BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE);
ret = btrfs_commit_transaction(trans, fs_info->tree_root);
if (ret < 0) {
errno = -ret;
error_msg(ERROR_MSG_COMMIT_TRANS, "final transaction: %m");
return ret;
}
printf("Converted the filesystem to block group tree feature\n");
return 0;
error:
btrfs_abort_transaction(trans, ret);
return ret;
}
static void print_usage(void)
{
printf("usage: btrfstune [options] device\n");
printf("Tune settings of filesystem features on an unmounted device\n\n");
printf("Options:\n");
printf(" change feature status:\n");
printf("\t-b enable block group tree (mkfs: block-group-tree, for less mount time)\n");
printf("\t-r enable extended inode refs (mkfs: extref, for hardlink limits)\n");
printf("\t-x enable skinny metadata extent refs (mkfs: skinny-metadata)\n");
printf("\t-n enable no-holes feature (mkfs: no-holes, more efficient sparse file representation)\n");
printf("\t-S <0|1> set/unset seeding status of a device\n");
printf(" uuid changes:\n");
printf("\t-u rewrite fsid, use a random one\n");
printf("\t-U UUID rewrite fsid to UUID\n");
printf("\t-m change fsid in metadata_uuid to a random UUID\n");
printf("\t (incompat change, more lightweight than -u|-U)\n");
printf("\t-M UUID change fsid in metadata_uuid to UUID\n");
printf(" general:\n");
printf("\t-f allow dangerous operations, make sure that you are aware of the dangers\n");
printf("\t--help print this help\n");
#if EXPERIMENTAL
printf("\nEXPERIMENTAL FEATURES:\n");
printf(" checksum changes:\n");
printf("\t--csum CSUM switch checksum for data and metadata to CSUM\n");
#endif
}
int BOX_MAIN(btrfstune)(int argc, char *argv[])
{
struct btrfs_root *root;
unsigned ctree_flags = OPEN_CTREE_WRITES;
int success = 0;
int total = 0;
int seeding_flag = 0;
u64 seeding_value = 0;
int random_fsid = 0;
int change_metadata_uuid = 0;
bool to_bg_tree = false;
int csum_type = -1;
char *new_fsid_str = NULL;
int ret;
u64 super_flags = 0;
int fd = -1;
while(1) {
enum { GETOPT_VAL_CSUM = GETOPT_VAL_FIRST };
static const struct option long_options[] = {
{ "help", no_argument, NULL, GETOPT_VAL_HELP},
#if EXPERIMENTAL
{ "csum", required_argument, NULL, GETOPT_VAL_CSUM },
#endif
{ NULL, 0, NULL, 0 }
};
#if EXPERIMENTAL
int c = getopt_long(argc, argv, "S:rxfuU:nmM:b", long_options, NULL);
#else
int c = getopt_long(argc, argv, "S:rxfuU:nmM:", long_options, NULL);
#endif
if (c < 0)
break;
switch(c) {
case 'b':
to_bg_tree = true;
break;
case 'S':
seeding_flag = 1;
seeding_value = arg_strtou64(optarg);
break;
case 'r':
super_flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF;
break;
case 'x':
super_flags |= BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA;
break;
case 'n':
super_flags |= BTRFS_FEATURE_INCOMPAT_NO_HOLES;
break;
case 'f':
force = 1;
break;
case 'U':
ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
new_fsid_str = optarg;
break;
case 'u':
ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
random_fsid = 1;
break;
case 'M':
ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
change_metadata_uuid = 1;
new_fsid_str = optarg;
break;
case 'm':