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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Miao Xie](/assets/img/avatar_default.png)
There were several problems about chunk mutex usage: - Lock chunk mutex when updating metadata. It would cause the nested deadlock because updating metadata might need allocate new chunks that need acquire chunk mutex. We remove chunk mutex at this case, because b-tree lock and other lock mechanism can help us. - ABBA deadlock occured between device_list_mutex and chunk_mutex. When we update device status, we must acquire device_list_mutex at the beginning, and then we might get chunk_mutex during the device status update because we need allocate new chunks for metadata COW. But at most place, we acquire chunk_mutex at first and then acquire device list mutex. We need change the lock order. - Some place we needn't acquire chunk_mutex. For example we needn't get chunk_mutex when we free a empty seed fs_devices structure. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
942 lines
29 KiB
C
942 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->commit_total_bytes =
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dev_replace->srcdev->commit_total_bytes;
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dev_replace->tgtdev->bytes_used =
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dev_replace->srcdev->bytes_used;
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dev_replace->tgtdev->commit_bytes_used =
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dev_replace->srcdev->commit_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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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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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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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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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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|
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switch (args->start.cont_reading_from_srcdev_mode) {
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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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}
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|
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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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|
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/*
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* Here we commit the transaction to make sure commit_total_bytes
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* of all the devices are updated.
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*/
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trans = btrfs_attach_transaction(root);
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if (!IS_ERR(trans)) {
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ret = btrfs_commit_transaction(trans, root);
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if (ret)
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return ret;
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} else if (PTR_ERR(trans) != -ENOENT) {
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return PTR_ERR(trans);
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}
|
|
|
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/* the disk copy procedure reuses the scrub code */
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mutex_lock(&fs_info->volume_mutex);
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ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
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args->start.srcdev_name,
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&src_device);
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if (ret) {
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mutex_unlock(&fs_info->volume_mutex);
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return ret;
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}
|
|
|
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ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
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src_device, &tgt_device);
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mutex_unlock(&fs_info->volume_mutex);
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if (ret)
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return ret;
|
|
|
|
btrfs_dev_replace_lock(dev_replace);
|
|
switch (dev_replace->replace_state) {
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case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
break;
|
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case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
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args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
|
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goto leave;
|
|
}
|
|
|
|
dev_replace->cont_reading_from_srcdev_mode =
|
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args->start.cont_reading_from_srcdev_mode;
|
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WARN_ON(!src_device);
|
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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));
|
|
|
|
/*
|
|
* 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,
|
|
btrfs_device_get_total_bytes(src_device),
|
|
&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);
|
|
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->fs_devices->device_list_mutex);
|
|
mutex_lock(&root->fs_info->chunk_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->chunk_mutex);
|
|
mutex_unlock(&root->fs_info->fs_devices->device_list_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;
|
|
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));
|
|
btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes);
|
|
btrfs_device_set_disk_total_bytes(tgt_device,
|
|
src_device->disk_total_bytes);
|
|
btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used);
|
|
ASSERT(list_empty(&src_device->resized_list));
|
|
tgt_device->commit_total_bytes = src_device->commit_total_bytes;
|
|
tgt_device->commit_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_dev_replace_unlock(dev_replace);
|
|
|
|
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.
|
|
*/
|
|
mutex_unlock(&root->fs_info->chunk_mutex);
|
|
mutex_unlock(&root->fs_info->fs_devices->device_list_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;
|
|
struct btrfs_device *srcdev;
|
|
|
|
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:
|
|
srcdev = dev_replace->srcdev;
|
|
args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
|
|
div64_u64(btrfs_device_get_total_bytes(srcdev), 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,
|
|
btrfs_device_get_total_bytes(dev_replace->srcdev),
|
|
&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;
|
|
}
|
|
|
|
}
|