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![Anand Jain](/assets/img/avatar_default.png)
there is no matching open parenthesis for the closing parenthesis Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Chris Mason <clm@fb.com>
934 lines
29 KiB
C
934 lines
29 KiB
C
/*
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* Copyright (C) STRATO AG 2012. All rights reserved.
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*
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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 <linux/sched.h>
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#include <linux/bio.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include <linux/blkdev.h>
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#include <linux/random.h>
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#include <linux/iocontext.h>
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#include <linux/capability.h>
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#include <linux/kthread.h>
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#include <linux/math64.h>
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#include <asm/div64.h>
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#include "ctree.h"
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#include "extent_map.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "print-tree.h"
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#include "volumes.h"
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#include "async-thread.h"
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#include "check-integrity.h"
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#include "rcu-string.h"
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#include "dev-replace.h"
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#include "sysfs.h"
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static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
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int scrub_ret);
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static void btrfs_dev_replace_update_device_in_mapping_tree(
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struct btrfs_fs_info *fs_info,
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struct btrfs_device *srcdev,
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struct btrfs_device *tgtdev);
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static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
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char *srcdev_name,
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struct btrfs_device **device);
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static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
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static int btrfs_dev_replace_kthread(void *data);
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static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
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int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_key key;
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struct btrfs_root *dev_root = fs_info->dev_root;
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
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struct extent_buffer *eb;
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int slot;
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int ret = 0;
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struct btrfs_path *path = NULL;
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int item_size;
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struct btrfs_dev_replace_item *ptr;
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u64 src_devid;
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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key.objectid = 0;
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key.type = BTRFS_DEV_REPLACE_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
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if (ret) {
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no_valid_dev_replace_entry_found:
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ret = 0;
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dev_replace->replace_state =
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BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED;
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dev_replace->cont_reading_from_srcdev_mode =
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BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
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dev_replace->replace_state = 0;
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dev_replace->time_started = 0;
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dev_replace->time_stopped = 0;
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atomic64_set(&dev_replace->num_write_errors, 0);
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atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
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dev_replace->cursor_left = 0;
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dev_replace->committed_cursor_left = 0;
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dev_replace->cursor_left_last_write_of_item = 0;
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dev_replace->cursor_right = 0;
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dev_replace->srcdev = NULL;
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dev_replace->tgtdev = NULL;
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dev_replace->is_valid = 0;
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dev_replace->item_needs_writeback = 0;
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goto out;
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}
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slot = path->slots[0];
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eb = path->nodes[0];
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item_size = btrfs_item_size_nr(eb, slot);
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ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item);
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if (item_size != sizeof(struct btrfs_dev_replace_item)) {
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btrfs_warn(fs_info,
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"dev_replace entry found has unexpected size, ignore entry");
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goto no_valid_dev_replace_entry_found;
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}
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src_devid = btrfs_dev_replace_src_devid(eb, ptr);
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dev_replace->cont_reading_from_srcdev_mode =
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btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr);
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dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr);
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dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr);
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dev_replace->time_stopped =
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btrfs_dev_replace_time_stopped(eb, ptr);
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atomic64_set(&dev_replace->num_write_errors,
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btrfs_dev_replace_num_write_errors(eb, ptr));
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atomic64_set(&dev_replace->num_uncorrectable_read_errors,
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btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
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dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr);
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dev_replace->committed_cursor_left = dev_replace->cursor_left;
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dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left;
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dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr);
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dev_replace->is_valid = 1;
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dev_replace->item_needs_writeback = 0;
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switch (dev_replace->replace_state) {
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case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
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case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
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case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
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dev_replace->srcdev = NULL;
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dev_replace->tgtdev = NULL;
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break;
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case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
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case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
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dev_replace->srcdev = btrfs_find_device(fs_info, src_devid,
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NULL, NULL);
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dev_replace->tgtdev = btrfs_find_device(fs_info,
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BTRFS_DEV_REPLACE_DEVID,
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NULL, NULL);
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/*
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* allow 'btrfs dev replace_cancel' if src/tgt device is
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* missing
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*/
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if (!dev_replace->srcdev &&
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!btrfs_test_opt(dev_root, DEGRADED)) {
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ret = -EIO;
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btrfs_warn(fs_info,
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"cannot mount because device replace operation is ongoing and");
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btrfs_warn(fs_info,
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"srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
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src_devid);
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}
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if (!dev_replace->tgtdev &&
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!btrfs_test_opt(dev_root, DEGRADED)) {
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ret = -EIO;
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btrfs_warn(fs_info,
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"cannot mount because device replace operation is ongoing and");
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btrfs_warn(fs_info,
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"tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
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BTRFS_DEV_REPLACE_DEVID);
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}
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if (dev_replace->tgtdev) {
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if (dev_replace->srcdev) {
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dev_replace->tgtdev->total_bytes =
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dev_replace->srcdev->total_bytes;
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dev_replace->tgtdev->disk_total_bytes =
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dev_replace->srcdev->disk_total_bytes;
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dev_replace->tgtdev->bytes_used =
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dev_replace->srcdev->bytes_used;
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}
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dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1;
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btrfs_init_dev_replace_tgtdev_for_resume(fs_info,
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dev_replace->tgtdev);
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}
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break;
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}
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out:
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if (path)
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btrfs_free_path(path);
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return ret;
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}
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/*
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* called from commit_transaction. Writes changed device replace state to
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* disk.
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*/
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int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info)
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{
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int ret;
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struct btrfs_root *dev_root = fs_info->dev_root;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct extent_buffer *eb;
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struct btrfs_dev_replace_item *ptr;
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
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btrfs_dev_replace_lock(dev_replace);
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if (!dev_replace->is_valid ||
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!dev_replace->item_needs_writeback) {
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btrfs_dev_replace_unlock(dev_replace);
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return 0;
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}
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btrfs_dev_replace_unlock(dev_replace);
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key.objectid = 0;
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key.type = BTRFS_DEV_REPLACE_KEY;
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key.offset = 0;
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
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if (ret < 0) {
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btrfs_warn(fs_info, "error %d while searching for dev_replace item!",
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ret);
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goto out;
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}
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if (ret == 0 &&
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btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
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/*
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* need to delete old one and insert a new one.
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* Since no attempt is made to recover any old state, if the
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* dev_replace state is 'running', the data on the target
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* drive is lost.
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* It would be possible to recover the state: just make sure
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* that the beginning of the item is never changed and always
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* contains all the essential information. Then read this
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* minimal set of information and use it as a base for the
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* new state.
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*/
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ret = btrfs_del_item(trans, dev_root, path);
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if (ret != 0) {
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btrfs_warn(fs_info, "delete too small dev_replace item failed %d!",
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ret);
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goto out;
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}
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ret = 1;
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}
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if (ret == 1) {
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/* need to insert a new item */
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btrfs_release_path(path);
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ret = btrfs_insert_empty_item(trans, dev_root, path,
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&key, sizeof(*ptr));
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if (ret < 0) {
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btrfs_warn(fs_info, "insert dev_replace item failed %d!",
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ret);
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goto out;
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}
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}
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eb = path->nodes[0];
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ptr = btrfs_item_ptr(eb, path->slots[0],
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struct btrfs_dev_replace_item);
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btrfs_dev_replace_lock(dev_replace);
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if (dev_replace->srcdev)
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btrfs_set_dev_replace_src_devid(eb, ptr,
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dev_replace->srcdev->devid);
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else
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btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1);
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btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr,
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dev_replace->cont_reading_from_srcdev_mode);
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btrfs_set_dev_replace_replace_state(eb, ptr,
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dev_replace->replace_state);
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btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started);
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btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped);
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btrfs_set_dev_replace_num_write_errors(eb, ptr,
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atomic64_read(&dev_replace->num_write_errors));
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btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
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atomic64_read(&dev_replace->num_uncorrectable_read_errors));
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dev_replace->cursor_left_last_write_of_item =
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dev_replace->cursor_left;
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btrfs_set_dev_replace_cursor_left(eb, ptr,
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dev_replace->cursor_left_last_write_of_item);
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btrfs_set_dev_replace_cursor_right(eb, ptr,
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dev_replace->cursor_right);
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dev_replace->item_needs_writeback = 0;
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btrfs_dev_replace_unlock(dev_replace);
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btrfs_mark_buffer_dirty(eb);
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out:
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btrfs_free_path(path);
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return ret;
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}
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|
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void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
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|
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dev_replace->committed_cursor_left =
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dev_replace->cursor_left_last_write_of_item;
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}
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|
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int btrfs_dev_replace_start(struct btrfs_root *root,
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struct btrfs_ioctl_dev_replace_args *args)
|
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{
|
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struct btrfs_trans_handle *trans;
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struct btrfs_fs_info *fs_info = root->fs_info;
|
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
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int ret;
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struct btrfs_device *tgt_device = NULL;
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struct btrfs_device *src_device = NULL;
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|
|
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if (btrfs_fs_incompat(fs_info, RAID56)) {
|
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btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6");
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return -EOPNOTSUPP;
|
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}
|
|
|
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switch (args->start.cont_reading_from_srcdev_mode) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
|
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case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
|
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break;
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default:
|
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return -EINVAL;
|
|
}
|
|
|
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if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
|
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args->start.tgtdev_name[0] == '\0')
|
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return -EINVAL;
|
|
|
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mutex_lock(&fs_info->volume_mutex);
|
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ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
|
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&tgt_device);
|
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if (ret) {
|
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btrfs_err(fs_info, "target device %s is invalid!",
|
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args->start.tgtdev_name);
|
|
mutex_unlock(&fs_info->volume_mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
|
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args->start.srcdev_name,
|
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&src_device);
|
|
mutex_unlock(&fs_info->volume_mutex);
|
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if (ret) {
|
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ret = -EINVAL;
|
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goto leave_no_lock;
|
|
}
|
|
|
|
if (tgt_device->total_bytes < src_device->total_bytes) {
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|
btrfs_err(fs_info, "target device is smaller than source device!");
|
|
ret = -EINVAL;
|
|
goto leave_no_lock;
|
|
}
|
|
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
|
|
goto leave;
|
|
}
|
|
|
|
dev_replace->cont_reading_from_srcdev_mode =
|
|
args->start.cont_reading_from_srcdev_mode;
|
|
WARN_ON(!src_device);
|
|
dev_replace->srcdev = src_device;
|
|
WARN_ON(!tgt_device);
|
|
dev_replace->tgtdev = tgt_device;
|
|
|
|
printk_in_rcu(KERN_INFO
|
|
"BTRFS: dev_replace from %s (devid %llu) to %s started\n",
|
|
src_device->missing ? "<missing disk>" :
|
|
rcu_str_deref(src_device->name),
|
|
src_device->devid,
|
|
rcu_str_deref(tgt_device->name));
|
|
|
|
tgt_device->total_bytes = src_device->total_bytes;
|
|
tgt_device->disk_total_bytes = src_device->disk_total_bytes;
|
|
tgt_device->bytes_used = src_device->bytes_used;
|
|
|
|
/*
|
|
* from now on, the writes to the srcdev are all duplicated to
|
|
* go to the tgtdev as well (refer to btrfs_map_block()).
|
|
*/
|
|
dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
|
|
dev_replace->time_started = get_seconds();
|
|
dev_replace->cursor_left = 0;
|
|
dev_replace->committed_cursor_left = 0;
|
|
dev_replace->cursor_left_last_write_of_item = 0;
|
|
dev_replace->cursor_right = 0;
|
|
dev_replace->is_valid = 1;
|
|
dev_replace->item_needs_writeback = 1;
|
|
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
|
|
btrfs_wait_ordered_roots(root->fs_info, -1);
|
|
|
|
/* force writing the updated state information to disk */
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
goto leave;
|
|
}
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
WARN_ON(ret);
|
|
|
|
/* the disk copy procedure reuses the scrub code */
|
|
ret = btrfs_scrub_dev(fs_info, src_device->devid, 0,
|
|
src_device->total_bytes,
|
|
&dev_replace->scrub_progress, 0, 1);
|
|
|
|
ret = btrfs_dev_replace_finishing(root->fs_info, ret);
|
|
WARN_ON(ret);
|
|
|
|
return 0;
|
|
|
|
leave:
|
|
dev_replace->srcdev = NULL;
|
|
dev_replace->tgtdev = NULL;
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
leave_no_lock:
|
|
if (tgt_device)
|
|
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* blocked until all flighting bios are finished.
|
|
*/
|
|
static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
s64 writers;
|
|
DEFINE_WAIT(wait);
|
|
|
|
set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state);
|
|
do {
|
|
prepare_to_wait(&fs_info->replace_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
writers = percpu_counter_sum(&fs_info->bio_counter);
|
|
if (writers)
|
|
schedule();
|
|
finish_wait(&fs_info->replace_wait, &wait);
|
|
} while (writers);
|
|
}
|
|
|
|
/*
|
|
* we have removed target device, it is safe to allow new bios request.
|
|
*/
|
|
static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state);
|
|
if (waitqueue_active(&fs_info->replace_wait))
|
|
wake_up(&fs_info->replace_wait);
|
|
}
|
|
|
|
static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
|
|
int scrub_ret)
|
|
{
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
struct btrfs_device *tgt_device;
|
|
struct btrfs_device *src_device;
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
u8 uuid_tmp[BTRFS_UUID_SIZE];
|
|
struct btrfs_trans_handle *trans;
|
|
int ret = 0;
|
|
|
|
/* don't allow cancel or unmount to disturb the finishing procedure */
|
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
|
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
/* was the operation canceled, or is it finished? */
|
|
if (dev_replace->replace_state !=
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return 0;
|
|
}
|
|
|
|
tgt_device = dev_replace->tgtdev;
|
|
src_device = dev_replace->srcdev;
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
|
|
/*
|
|
* flush all outstanding I/O and inode extent mappings before the
|
|
* copy operation is declared as being finished
|
|
*/
|
|
ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
|
|
if (ret) {
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return ret;
|
|
}
|
|
btrfs_wait_ordered_roots(root->fs_info, -1);
|
|
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (IS_ERR(trans)) {
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return PTR_ERR(trans);
|
|
}
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
WARN_ON(ret);
|
|
|
|
/* keep away write_all_supers() during the finishing procedure */
|
|
mutex_lock(&root->fs_info->chunk_mutex);
|
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
dev_replace->replace_state =
|
|
scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
|
|
: BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
|
|
dev_replace->tgtdev = NULL;
|
|
dev_replace->srcdev = NULL;
|
|
dev_replace->time_stopped = get_seconds();
|
|
dev_replace->item_needs_writeback = 1;
|
|
|
|
/* replace old device with new one in mapping tree */
|
|
if (!scrub_ret) {
|
|
btrfs_dev_replace_update_device_in_mapping_tree(fs_info,
|
|
src_device,
|
|
tgt_device);
|
|
} else {
|
|
printk_in_rcu(KERN_ERR
|
|
"BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
|
|
src_device->missing ? "<missing disk>" :
|
|
rcu_str_deref(src_device->name),
|
|
src_device->devid,
|
|
rcu_str_deref(tgt_device->name), scrub_ret);
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
|
mutex_unlock(&root->fs_info->chunk_mutex);
|
|
if (tgt_device)
|
|
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
|
|
return 0;
|
|
}
|
|
|
|
printk_in_rcu(KERN_INFO
|
|
"BTRFS: dev_replace from %s (devid %llu) to %s finished\n",
|
|
src_device->missing ? "<missing disk>" :
|
|
rcu_str_deref(src_device->name),
|
|
src_device->devid,
|
|
rcu_str_deref(tgt_device->name));
|
|
tgt_device->is_tgtdev_for_dev_replace = 0;
|
|
tgt_device->devid = src_device->devid;
|
|
src_device->devid = BTRFS_DEV_REPLACE_DEVID;
|
|
tgt_device->bytes_used = src_device->bytes_used;
|
|
memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp));
|
|
memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid));
|
|
memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid));
|
|
tgt_device->total_bytes = src_device->total_bytes;
|
|
tgt_device->disk_total_bytes = src_device->disk_total_bytes;
|
|
tgt_device->bytes_used = src_device->bytes_used;
|
|
if (fs_info->sb->s_bdev == src_device->bdev)
|
|
fs_info->sb->s_bdev = tgt_device->bdev;
|
|
if (fs_info->fs_devices->latest_bdev == src_device->bdev)
|
|
fs_info->fs_devices->latest_bdev = tgt_device->bdev;
|
|
list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
|
|
if (src_device->fs_devices->seeding)
|
|
fs_info->fs_devices->rw_devices++;
|
|
|
|
/* replace the sysfs entry */
|
|
btrfs_kobj_rm_device(fs_info, src_device);
|
|
btrfs_kobj_add_device(fs_info, tgt_device);
|
|
|
|
btrfs_rm_dev_replace_blocked(fs_info);
|
|
|
|
btrfs_rm_dev_replace_srcdev(fs_info, src_device);
|
|
|
|
btrfs_rm_dev_replace_unblocked(fs_info);
|
|
|
|
/*
|
|
* this is again a consistent state where no dev_replace procedure
|
|
* is running, the target device is part of the filesystem, the
|
|
* source device is not part of the filesystem anymore and its 1st
|
|
* superblock is scratched out so that it is no longer marked to
|
|
* belong to this filesystem.
|
|
*/
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
|
mutex_unlock(&root->fs_info->chunk_mutex);
|
|
|
|
/* write back the superblocks */
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (!IS_ERR(trans))
|
|
btrfs_commit_transaction(trans, root);
|
|
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_dev_replace_update_device_in_mapping_tree(
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_device *srcdev,
|
|
struct btrfs_device *tgtdev)
|
|
{
|
|
struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
|
|
struct extent_map *em;
|
|
struct map_lookup *map;
|
|
u64 start = 0;
|
|
int i;
|
|
|
|
write_lock(&em_tree->lock);
|
|
do {
|
|
em = lookup_extent_mapping(em_tree, start, (u64)-1);
|
|
if (!em)
|
|
break;
|
|
map = (struct map_lookup *)em->bdev;
|
|
for (i = 0; i < map->num_stripes; i++)
|
|
if (srcdev == map->stripes[i].dev)
|
|
map->stripes[i].dev = tgtdev;
|
|
start = em->start + em->len;
|
|
free_extent_map(em);
|
|
} while (start);
|
|
write_unlock(&em_tree->lock);
|
|
}
|
|
|
|
static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
|
|
char *srcdev_name,
|
|
struct btrfs_device **device)
|
|
{
|
|
int ret;
|
|
|
|
if (srcdevid) {
|
|
ret = 0;
|
|
*device = btrfs_find_device(root->fs_info, srcdevid, NULL,
|
|
NULL);
|
|
if (!*device)
|
|
ret = -ENOENT;
|
|
} else {
|
|
ret = btrfs_find_device_missing_or_by_path(root, srcdev_name,
|
|
device);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_ioctl_dev_replace_args *args)
|
|
{
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
/* even if !dev_replace_is_valid, the values are good enough for
|
|
* the replace_status ioctl */
|
|
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
|
args->status.replace_state = dev_replace->replace_state;
|
|
args->status.time_started = dev_replace->time_started;
|
|
args->status.time_stopped = dev_replace->time_stopped;
|
|
args->status.num_write_errors =
|
|
atomic64_read(&dev_replace->num_write_errors);
|
|
args->status.num_uncorrectable_read_errors =
|
|
atomic64_read(&dev_replace->num_uncorrectable_read_errors);
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
args->status.progress_1000 = 0;
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
args->status.progress_1000 = 1000;
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
|
|
div64_u64(dev_replace->srcdev->total_bytes, 1000));
|
|
break;
|
|
}
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
}
|
|
|
|
int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_ioctl_dev_replace_args *args)
|
|
{
|
|
args->result = __btrfs_dev_replace_cancel(fs_info);
|
|
return 0;
|
|
}
|
|
|
|
static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
struct btrfs_device *tgt_device = NULL;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
u64 result;
|
|
int ret;
|
|
|
|
if (fs_info->sb->s_flags & MS_RDONLY)
|
|
return -EROFS;
|
|
|
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
goto leave;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
|
tgt_device = dev_replace->tgtdev;
|
|
dev_replace->tgtdev = NULL;
|
|
dev_replace->srcdev = NULL;
|
|
break;
|
|
}
|
|
dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
|
|
dev_replace->time_stopped = get_seconds();
|
|
dev_replace->item_needs_writeback = 1;
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
btrfs_scrub_cancel(fs_info);
|
|
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (IS_ERR(trans)) {
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return PTR_ERR(trans);
|
|
}
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
WARN_ON(ret);
|
|
if (tgt_device)
|
|
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
|
|
|
|
leave:
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return result;
|
|
}
|
|
|
|
void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
|
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
|
|
dev_replace->time_stopped = get_seconds();
|
|
dev_replace->item_needs_writeback = 1;
|
|
btrfs_info(fs_info, "suspending dev_replace for unmount");
|
|
break;
|
|
}
|
|
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
}
|
|
|
|
/* resume dev_replace procedure that was interrupted by unmount */
|
|
int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct task_struct *task;
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
return 0;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
|
|
break;
|
|
}
|
|
if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) {
|
|
btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing");
|
|
btrfs_info(fs_info,
|
|
"you may cancel the operation after 'mount -o degraded'");
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
return 0;
|
|
}
|
|
btrfs_dev_replace_unlock(dev_replace);
|
|
|
|
WARN_ON(atomic_xchg(
|
|
&fs_info->mutually_exclusive_operation_running, 1));
|
|
task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
|
|
return PTR_ERR_OR_ZERO(task);
|
|
}
|
|
|
|
static int btrfs_dev_replace_kthread(void *data)
|
|
{
|
|
struct btrfs_fs_info *fs_info = data;
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
struct btrfs_ioctl_dev_replace_args *status_args;
|
|
u64 progress;
|
|
|
|
status_args = kzalloc(sizeof(*status_args), GFP_NOFS);
|
|
if (status_args) {
|
|
btrfs_dev_replace_status(fs_info, status_args);
|
|
progress = status_args->status.progress_1000;
|
|
kfree(status_args);
|
|
do_div(progress, 10);
|
|
printk_in_rcu(KERN_INFO
|
|
"BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
|
|
dev_replace->srcdev->missing ? "<missing disk>" :
|
|
rcu_str_deref(dev_replace->srcdev->name),
|
|
dev_replace->srcdev->devid,
|
|
dev_replace->tgtdev ?
|
|
rcu_str_deref(dev_replace->tgtdev->name) :
|
|
"<missing target disk>",
|
|
(unsigned int)progress);
|
|
}
|
|
btrfs_dev_replace_continue_on_mount(fs_info);
|
|
atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
int ret;
|
|
|
|
ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid,
|
|
dev_replace->committed_cursor_left,
|
|
dev_replace->srcdev->total_bytes,
|
|
&dev_replace->scrub_progress, 0, 1);
|
|
ret = btrfs_dev_replace_finishing(fs_info, ret);
|
|
WARN_ON(ret);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
|
|
{
|
|
if (!dev_replace->is_valid)
|
|
return 0;
|
|
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
return 0;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
/*
|
|
* return true even if tgtdev is missing (this is
|
|
* something that can happen if the dev_replace
|
|
* procedure is suspended by an umount and then
|
|
* the tgtdev is missing (or "btrfs dev scan") was
|
|
* not called and the the filesystem is remounted
|
|
* in degraded state. This does not stop the
|
|
* dev_replace procedure. It needs to be canceled
|
|
* manually if the cancelation is wanted.
|
|
*/
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace)
|
|
{
|
|
/* the beginning is just an optimization for the typical case */
|
|
if (atomic_read(&dev_replace->nesting_level) == 0) {
|
|
acquire_lock:
|
|
/* this is not a nested case where the same thread
|
|
* is trying to acqurire the same lock twice */
|
|
mutex_lock(&dev_replace->lock);
|
|
mutex_lock(&dev_replace->lock_management_lock);
|
|
dev_replace->lock_owner = current->pid;
|
|
atomic_inc(&dev_replace->nesting_level);
|
|
mutex_unlock(&dev_replace->lock_management_lock);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&dev_replace->lock_management_lock);
|
|
if (atomic_read(&dev_replace->nesting_level) > 0 &&
|
|
dev_replace->lock_owner == current->pid) {
|
|
WARN_ON(!mutex_is_locked(&dev_replace->lock));
|
|
atomic_inc(&dev_replace->nesting_level);
|
|
mutex_unlock(&dev_replace->lock_management_lock);
|
|
return;
|
|
}
|
|
|
|
mutex_unlock(&dev_replace->lock_management_lock);
|
|
goto acquire_lock;
|
|
}
|
|
|
|
void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace)
|
|
{
|
|
WARN_ON(!mutex_is_locked(&dev_replace->lock));
|
|
mutex_lock(&dev_replace->lock_management_lock);
|
|
WARN_ON(atomic_read(&dev_replace->nesting_level) < 1);
|
|
WARN_ON(dev_replace->lock_owner != current->pid);
|
|
atomic_dec(&dev_replace->nesting_level);
|
|
if (atomic_read(&dev_replace->nesting_level) == 0) {
|
|
dev_replace->lock_owner = 0;
|
|
mutex_unlock(&dev_replace->lock_management_lock);
|
|
mutex_unlock(&dev_replace->lock);
|
|
} else {
|
|
mutex_unlock(&dev_replace->lock_management_lock);
|
|
}
|
|
}
|
|
|
|
void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
percpu_counter_inc(&fs_info->bio_counter);
|
|
}
|
|
|
|
void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
|
|
{
|
|
percpu_counter_dec(&fs_info->bio_counter);
|
|
|
|
if (waitqueue_active(&fs_info->replace_wait))
|
|
wake_up(&fs_info->replace_wait);
|
|
}
|
|
|
|
void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
again:
|
|
percpu_counter_inc(&fs_info->bio_counter);
|
|
if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) {
|
|
btrfs_bio_counter_dec(fs_info);
|
|
wait_event(fs_info->replace_wait,
|
|
!test_bit(BTRFS_FS_STATE_DEV_REPLACING,
|
|
&fs_info->fs_state));
|
|
goto again;
|
|
}
|
|
|
|
}
|