mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-28 09:02:19 +00:00
68a04bc710
With previous btrfstune support to convert to block-group-tree, it has
implemented most of the infrastructure for bi-directional conversion.
This patch will implement the remaining conversion support to go back to
extent tree.
The modification includes:
- New convert_to_extent_tree() function in btrfstune.c
It's almost the same as convert_to_bg_tree(), but with small changes:
* No need to set extra features like NO_HOLES/FST.
* Need to delete the block group tree when everything finished.
- Update btrfs_delete_and_free_root() to handle non-global roots
Currently the function can only accepts global roots (extent/csum/free
space trees)
If we pass a non-global root into the function, we will screw up
global_roots_tree and crash.
Since we're going to use btrfs_delete_and_free_root() to free block
group tree which is not a global tree, this is needed.
- New handling for half converted fs in get_last_converted_bg()
There are two cases need to be handled:
* The bg tree is already empty
We need to grab the first bg in extent tree.
Or at conversion function we will fail at grabbing the first bg.
* The bg tree is not empty
Then we need to grab the last bg in extent tree.
- Extra root switching in involved functions. This involves:
* read_converting_block_groups()
* insert_block_group_item()
* update_block_group_item()
We just need to update our target root according to the current
compat_ro and super flags.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
272 lines
7.4 KiB
C
272 lines
7.4 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <errno.h>
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#include <stdio.h>
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#include "kernel-shared/ctree.h"
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#include "kernel-shared/disk-io.h"
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#include "kernel-shared/transaction.h"
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#include "common/messages.h"
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#include "common/extent-cache.h"
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/* After this many block groups we need to commit transaction. */
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#define BLOCK_GROUP_BATCH 64
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int convert_to_bg_tree(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_super_block *sb = fs_info->super_copy;
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struct btrfs_trans_handle *trans;
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struct cache_extent *ce;
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int converted_bgs = 0;
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int ret;
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trans = btrfs_start_transaction(fs_info->tree_root, 2);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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errno = -ret;
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error_msg(ERROR_MSG_START_TRANS, "%m");
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return ret;
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}
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/* Set NO_HOLES feature */
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btrfs_set_super_incompat_flags(sb, btrfs_super_incompat_flags(sb) |
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BTRFS_FEATURE_INCOMPAT_NO_HOLES);
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/* We're resuming from previous run. */
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if (btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_CHANGING_BG_TREE)
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goto iterate_bgs;
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ret = btrfs_create_root(trans, fs_info,
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BTRFS_BLOCK_GROUP_TREE_OBJECTID);
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if (ret < 0) {
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error("failed to create block group root: %d", ret);
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goto error;
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}
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btrfs_set_super_flags(sb,
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btrfs_super_flags(sb) |
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BTRFS_SUPER_FLAG_CHANGING_BG_TREE);
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fs_info->last_converted_bg_bytenr = (u64)-1;
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/* Now commit the transaction to make above changes to reach disks. */
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ret = btrfs_commit_transaction(trans, fs_info->tree_root);
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if (ret < 0) {
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error_msg(ERROR_MSG_COMMIT_TRANS, "new bg root: %d", ret);
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goto error;
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}
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trans = btrfs_start_transaction(fs_info->tree_root, 2);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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errno = -ret;
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error_msg(ERROR_MSG_START_TRANS, "%m");
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return ret;
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}
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iterate_bgs:
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if (fs_info->last_converted_bg_bytenr == (u64)-1) {
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ce = last_cache_extent(&fs_info->mapping_tree.cache_tree);
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} else {
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ce = search_cache_extent(&fs_info->mapping_tree.cache_tree,
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fs_info->last_converted_bg_bytenr);
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if (!ce) {
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error("failed to find block group for bytenr %llu",
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fs_info->last_converted_bg_bytenr);
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ret = -ENOENT;
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goto error;
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}
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ce = prev_cache_extent(ce);
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if (!ce) {
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error("no more block groups before bytenr %llu",
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fs_info->last_converted_bg_bytenr);
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ret = -ENOENT;
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goto error;
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}
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}
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/* Now convert each block */
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while (ce) {
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struct cache_extent *prev = prev_cache_extent(ce);
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u64 bytenr = ce->start;
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ret = btrfs_convert_one_bg(trans, bytenr);
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if (ret < 0)
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goto error;
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converted_bgs++;
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ce = prev;
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if (converted_bgs % BLOCK_GROUP_BATCH == 0) {
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ret = btrfs_commit_transaction(trans,
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fs_info->tree_root);
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if (ret < 0) {
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errno = -ret;
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error_msg(ERROR_MSG_COMMIT_TRANS, "%m");
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return ret;
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}
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trans = btrfs_start_transaction(fs_info->tree_root, 2);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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errno = -ret;
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error_msg(ERROR_MSG_START_TRANS, "%m");
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return ret;
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}
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}
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}
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/*
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* All bgs converted, remove the CHANGING_BG flag and set the compat ro
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* flag.
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*/
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fs_info->last_converted_bg_bytenr = 0;
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btrfs_set_super_flags(sb,
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btrfs_super_flags(sb) &
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~BTRFS_SUPER_FLAG_CHANGING_BG_TREE);
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btrfs_set_super_compat_ro_flags(sb,
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btrfs_super_compat_ro_flags(sb) |
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BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE);
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ret = btrfs_commit_transaction(trans, fs_info->tree_root);
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if (ret < 0) {
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errno = -ret;
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error_msg(ERROR_MSG_COMMIT_TRANS, "final transaction: %m");
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return ret;
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}
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pr_verbose(LOG_DEFAULT, "Converted the filesystem to block group tree feature\n");
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return 0;
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error:
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btrfs_abort_transaction(trans, ret);
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return ret;
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}
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int convert_to_extent_tree(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_super_block *sb = fs_info->super_copy;
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struct btrfs_trans_handle *trans;
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struct cache_extent *ce;
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u32 converted_bgs = 0;
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int ret;
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trans = btrfs_start_transaction(fs_info->tree_root, 2);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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error_msg(ERROR_MSG_START_TRANS, "%m");
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return ret;
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}
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/* We're resuming from previous run. */
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if (btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_CHANGING_BG_TREE)
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goto iterate_bgs;
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btrfs_set_super_flags(sb, btrfs_super_flags(sb) | BTRFS_SUPER_FLAG_CHANGING_BG_TREE);
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fs_info->last_converted_bg_bytenr = (u64)-1;
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/* Now commit the transaction to make the above changes to reach disks. */
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ret = btrfs_commit_transaction(trans, fs_info->tree_root);
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if (ret < 0) {
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errno = -ret;
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error_msg(ERROR_MSG_COMMIT_TRANS, "new extent tree root: %m");
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goto error;
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}
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trans = btrfs_start_transaction(fs_info->tree_root, 2);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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errno = -ret;
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error_msg(ERROR_MSG_START_TRANS, "%m");
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return ret;
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}
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iterate_bgs:
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if (fs_info->last_converted_bg_bytenr == (u64)-1) {
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ce = last_cache_extent(&fs_info->mapping_tree.cache_tree);
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} else {
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ce = search_cache_extent(&fs_info->mapping_tree.cache_tree,
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fs_info->last_converted_bg_bytenr);
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if (!ce) {
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error("failed to find block group for bytenr %llu",
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fs_info->last_converted_bg_bytenr);
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ret = -ENOENT;
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goto error;
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}
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ce = prev_cache_extent(ce);
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if (!ce) {
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error("no more block groups before bytenr %llu",
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fs_info->last_converted_bg_bytenr);
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ret = -ENOENT;
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goto error;
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}
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}
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/* Now convert each block group. */
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while (ce) {
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struct cache_extent *prev = prev_cache_extent(ce);
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u64 bytenr = ce->start;
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ret = btrfs_convert_one_bg(trans, bytenr);
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if (ret < 0)
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goto error;
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converted_bgs++;
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ce = prev;
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if (converted_bgs % BLOCK_GROUP_BATCH == 0) {
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ret = btrfs_commit_transaction(trans, fs_info->tree_root);
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if (ret < 0) {
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errno = -ret;
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error_msg(ERROR_MSG_COMMIT_TRANS, "%m");
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return ret;
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}
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trans = btrfs_start_transaction(fs_info->tree_root, 2);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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errno = -ret;
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error_msg(ERROR_MSG_COMMIT_TRANS, "%m");
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return ret;
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}
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}
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}
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/*
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* Remove block group tree, at this stage, the block group tree root
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* should be empty.
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*/
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ASSERT(btrfs_header_nritems(fs_info->block_group_root->node) == 0);
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ret = btrfs_delete_and_free_root(trans, fs_info->block_group_root);
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if (ret < 0) {
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errno = -ret;
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error("failed to remove bg tree: %m");
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goto error;
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}
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fs_info->block_group_root = NULL;
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/*
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* All bgs converted and bg tree removed, remove the CHANGING_BG_TREE
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* flag and remove the compat ro flag.
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*/
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fs_info->last_converted_bg_bytenr = 0;
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btrfs_set_super_flags(sb,
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btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_CHANGING_BG_TREE);
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btrfs_set_super_compat_ro_flags(sb,
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btrfs_super_compat_ro_flags(sb) &
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~BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE);
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ret = btrfs_commit_transaction(trans, fs_info->tree_root);
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if (ret < 0) {
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errno = -ret;
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error_msg(ERROR_MSG_COMMIT_TRANS, "%m");
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return ret;
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}
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pr_verbose(LOG_DEFAULT,
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"Converted filesystem with block-group-tree to extent tree feature");
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return 0;
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error:
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btrfs_abort_transaction(trans, ret);
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return ret;
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}
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