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![Anand Jain](/assets/img/avatar_default.png)
Since commit 668e48af7a
("btrfs: sysfs, add devid/dev_state kobject and
device attributes"), the functions btrfs_sysfs_add_device_link() and
btrfs_sysfs_rm_device_link() do more than just adding and removing the
device link as its name indicated. Rename them to be more specific
that's about the directory with the attirbutes
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1078 lines
32 KiB
C
1078 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) STRATO AG 2012. All rights reserved.
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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/blkdev.h>
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#include <linux/kthread.h>
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#include <linux/math64.h>
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#include "misc.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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/*
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* Device replace overview
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*
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* [Objective]
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* To copy all extents (both new and on-disk) from source device to target
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* device, while still keeping the filesystem read-write.
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*
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* [Method]
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* There are two main methods involved:
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*
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* - Write duplication
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*
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* All new writes will be written to both target and source devices, so even
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* if replace gets canceled, sources device still contans up-to-date data.
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*
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* Location: handle_ops_on_dev_replace() from __btrfs_map_block()
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* Start: btrfs_dev_replace_start()
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* End: btrfs_dev_replace_finishing()
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* Content: Latest data/metadata
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*
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* - Copy existing extents
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*
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* This happens by re-using scrub facility, as scrub also iterates through
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* existing extents from commit root.
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*
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* Location: scrub_write_block_to_dev_replace() from
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* scrub_block_complete()
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* Content: Data/meta from commit root.
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*
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* Due to the content difference, we need to avoid nocow write when dev-replace
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* is happening. This is done by marking the block group read-only and waiting
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* for NOCOW writes.
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*
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* After replace is done, the finishing part is done by swapping the target and
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* source devices.
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*
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* Location: btrfs_dev_replace_update_device_in_mapping_tree() from
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* btrfs_dev_replace_finishing()
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*/
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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_kthread(void *data);
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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_IOCTL_DEV_REPLACE_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->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->fs_devices,
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src_devid, NULL, NULL, true);
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dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices,
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BTRFS_DEV_REPLACE_DEVID,
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NULL, NULL, true);
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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(fs_info, 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(fs_info, 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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set_bit(BTRFS_DEV_STATE_REPLACE_TGT,
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&dev_replace->tgtdev->dev_state);
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WARN_ON(fs_info->fs_devices->rw_devices == 0);
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dev_replace->tgtdev->io_width = fs_info->sectorsize;
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dev_replace->tgtdev->io_align = fs_info->sectorsize;
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dev_replace->tgtdev->sector_size = fs_info->sectorsize;
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dev_replace->tgtdev->fs_info = fs_info;
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set_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
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&dev_replace->tgtdev->dev_state);
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}
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break;
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}
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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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* Initialize a new device for device replace target from a given source dev
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* and path.
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*
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* Return 0 and new device in @device_out, otherwise return < 0
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*/
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static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
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const char *device_path,
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struct btrfs_device *srcdev,
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struct btrfs_device **device_out)
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{
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struct btrfs_device *device;
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struct block_device *bdev;
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struct list_head *devices;
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struct rcu_string *name;
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u64 devid = BTRFS_DEV_REPLACE_DEVID;
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int ret = 0;
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*device_out = NULL;
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if (fs_info->fs_devices->seeding) {
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btrfs_err(fs_info, "the filesystem is a seed filesystem!");
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return -EINVAL;
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}
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bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
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fs_info->bdev_holder);
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if (IS_ERR(bdev)) {
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btrfs_err(fs_info, "target device %s is invalid!", device_path);
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return PTR_ERR(bdev);
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}
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sync_blockdev(bdev);
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devices = &fs_info->fs_devices->devices;
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list_for_each_entry(device, devices, dev_list) {
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if (device->bdev == bdev) {
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btrfs_err(fs_info,
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"target device is in the filesystem!");
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ret = -EEXIST;
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goto error;
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}
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}
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if (i_size_read(bdev->bd_inode) <
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btrfs_device_get_total_bytes(srcdev)) {
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btrfs_err(fs_info,
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"target device is smaller than source device!");
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ret = -EINVAL;
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goto error;
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}
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device = btrfs_alloc_device(NULL, &devid, NULL);
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if (IS_ERR(device)) {
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ret = PTR_ERR(device);
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goto error;
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}
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name = rcu_string_strdup(device_path, GFP_KERNEL);
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if (!name) {
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btrfs_free_device(device);
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ret = -ENOMEM;
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goto error;
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}
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rcu_assign_pointer(device->name, name);
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set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
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device->generation = 0;
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device->io_width = fs_info->sectorsize;
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device->io_align = fs_info->sectorsize;
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device->sector_size = fs_info->sectorsize;
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device->total_bytes = btrfs_device_get_total_bytes(srcdev);
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device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev);
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device->bytes_used = btrfs_device_get_bytes_used(srcdev);
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device->commit_total_bytes = srcdev->commit_total_bytes;
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device->commit_bytes_used = device->bytes_used;
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device->fs_info = fs_info;
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device->bdev = bdev;
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set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
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set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
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device->mode = FMODE_EXCL;
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device->dev_stats_valid = 1;
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set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
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device->fs_devices = fs_info->fs_devices;
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mutex_lock(&fs_info->fs_devices->device_list_mutex);
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list_add(&device->dev_list, &fs_info->fs_devices->devices);
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fs_info->fs_devices->num_devices++;
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fs_info->fs_devices->open_devices++;
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mutex_unlock(&fs_info->fs_devices->device_list_mutex);
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*device_out = device;
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return 0;
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error:
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blkdev_put(bdev, FMODE_EXCL);
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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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{
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struct btrfs_fs_info *fs_info = trans->fs_info;
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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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down_read(&dev_replace->rwsem);
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if (!dev_replace->is_valid ||
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!dev_replace->item_needs_writeback) {
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up_read(&dev_replace->rwsem);
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return 0;
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}
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up_read(&dev_replace->rwsem);
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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,
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"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,
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"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,
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"insert dev_replace item failed %d!", ret);
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goto out;
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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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down_write(&dev_replace->rwsem);
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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);
|
|
btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped);
|
|
btrfs_set_dev_replace_num_write_errors(eb, ptr,
|
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atomic64_read(&dev_replace->num_write_errors));
|
|
btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
|
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atomic64_read(&dev_replace->num_uncorrectable_read_errors));
|
|
dev_replace->cursor_left_last_write_of_item =
|
|
dev_replace->cursor_left;
|
|
btrfs_set_dev_replace_cursor_left(eb, ptr,
|
|
dev_replace->cursor_left_last_write_of_item);
|
|
btrfs_set_dev_replace_cursor_right(eb, ptr,
|
|
dev_replace->cursor_right);
|
|
dev_replace->item_needs_writeback = 0;
|
|
up_write(&dev_replace->rwsem);
|
|
|
|
btrfs_mark_buffer_dirty(eb);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static char* btrfs_dev_name(struct btrfs_device *device)
|
|
{
|
|
if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
|
|
return "<missing disk>";
|
|
else
|
|
return rcu_str_deref(device->name);
|
|
}
|
|
|
|
static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
|
|
const char *tgtdev_name, u64 srcdevid, const char *srcdev_name,
|
|
int read_src)
|
|
{
|
|
struct btrfs_root *root = fs_info->dev_root;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
int ret;
|
|
struct btrfs_device *tgt_device = NULL;
|
|
struct btrfs_device *src_device = NULL;
|
|
|
|
src_device = btrfs_find_device_by_devspec(fs_info, srcdevid,
|
|
srcdev_name);
|
|
if (IS_ERR(src_device))
|
|
return PTR_ERR(src_device);
|
|
|
|
if (btrfs_pinned_by_swapfile(fs_info, src_device)) {
|
|
btrfs_warn_in_rcu(fs_info,
|
|
"cannot replace device %s (devid %llu) due to active swapfile",
|
|
btrfs_dev_name(src_device), src_device->devid);
|
|
return -ETXTBSY;
|
|
}
|
|
|
|
/*
|
|
* Here we commit the transaction to make sure commit_total_bytes
|
|
* of all the devices are updated.
|
|
*/
|
|
trans = btrfs_attach_transaction(root);
|
|
if (!IS_ERR(trans)) {
|
|
ret = btrfs_commit_transaction(trans);
|
|
if (ret)
|
|
return ret;
|
|
} else if (PTR_ERR(trans) != -ENOENT) {
|
|
return PTR_ERR(trans);
|
|
}
|
|
|
|
ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name,
|
|
src_device, &tgt_device);
|
|
if (ret)
|
|
return ret;
|
|
|
|
down_write(&dev_replace->rwsem);
|
|
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:
|
|
ASSERT(0);
|
|
ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
|
|
up_write(&dev_replace->rwsem);
|
|
goto leave;
|
|
}
|
|
|
|
dev_replace->cont_reading_from_srcdev_mode = read_src;
|
|
dev_replace->srcdev = src_device;
|
|
dev_replace->tgtdev = tgt_device;
|
|
|
|
btrfs_info_in_rcu(fs_info,
|
|
"dev_replace from %s (devid %llu) to %s started",
|
|
btrfs_dev_name(src_device),
|
|
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 = ktime_get_real_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;
|
|
atomic64_set(&dev_replace->num_write_errors, 0);
|
|
atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
|
|
up_write(&dev_replace->rwsem);
|
|
|
|
ret = btrfs_sysfs_add_devices_dir(tgt_device->fs_devices, tgt_device);
|
|
if (ret)
|
|
btrfs_err(fs_info, "kobj add dev failed %d", ret);
|
|
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
|
|
|
|
/* Commit dev_replace state and reserve 1 item for it. */
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
down_write(&dev_replace->rwsem);
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED;
|
|
dev_replace->srcdev = NULL;
|
|
dev_replace->tgtdev = NULL;
|
|
up_write(&dev_replace->rwsem);
|
|
goto leave;
|
|
}
|
|
|
|
ret = btrfs_commit_transaction(trans);
|
|
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(fs_info, ret);
|
|
if (ret == -EINPROGRESS)
|
|
ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
|
|
|
|
return ret;
|
|
|
|
leave:
|
|
btrfs_destroy_dev_replace_tgtdev(tgt_device);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_ioctl_dev_replace_args *args)
|
|
{
|
|
int ret;
|
|
|
|
switch (args->start.cont_reading_from_srcdev_mode) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
|
|
case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
|
|
args->start.tgtdev_name[0] == '\0')
|
|
return -EINVAL;
|
|
|
|
ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name,
|
|
args->start.srcdevid,
|
|
args->start.srcdev_name,
|
|
args->start.cont_reading_from_srcdev_mode);
|
|
args->result = ret;
|
|
/* don't warn if EINPROGRESS, someone else might be running scrub */
|
|
if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS ||
|
|
ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR)
|
|
return 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* blocked until all in-flight bios operations are finished.
|
|
*/
|
|
static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state);
|
|
wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum(
|
|
&fs_info->dev_replace.bio_counter));
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
wake_up(&fs_info->dev_replace.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);
|
|
|
|
down_read(&dev_replace->rwsem);
|
|
/* was the operation canceled, or is it finished? */
|
|
if (dev_replace->replace_state !=
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
|
|
up_read(&dev_replace->rwsem);
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return 0;
|
|
}
|
|
|
|
tgt_device = dev_replace->tgtdev;
|
|
src_device = dev_replace->srcdev;
|
|
up_read(&dev_replace->rwsem);
|
|
|
|
/*
|
|
* flush all outstanding I/O and inode extent mappings before the
|
|
* copy operation is declared as being finished
|
|
*/
|
|
ret = btrfs_start_delalloc_roots(fs_info, -1);
|
|
if (ret) {
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
return ret;
|
|
}
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
|
|
|
|
/*
|
|
* We have to use this loop approach because at this point src_device
|
|
* has to be available for transaction commit to complete, yet new
|
|
* chunks shouldn't be allocated on the device.
|
|
*/
|
|
while (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);
|
|
WARN_ON(ret);
|
|
|
|
/* Prevent write_all_supers() during the finishing procedure */
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
/* Prevent new chunks being allocated on the source device */
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
|
|
if (!list_empty(&src_device->post_commit_list)) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
down_write(&dev_replace->rwsem);
|
|
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 = ktime_get_real_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 {
|
|
if (scrub_ret != -ECANCELED)
|
|
btrfs_err_in_rcu(fs_info,
|
|
"btrfs_scrub_dev(%s, %llu, %s) failed %d",
|
|
btrfs_dev_name(src_device),
|
|
src_device->devid,
|
|
rcu_str_deref(tgt_device->name), scrub_ret);
|
|
up_write(&dev_replace->rwsem);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
btrfs_rm_dev_replace_blocked(fs_info);
|
|
if (tgt_device)
|
|
btrfs_destroy_dev_replace_tgtdev(tgt_device);
|
|
btrfs_rm_dev_replace_unblocked(fs_info);
|
|
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
|
|
|
|
return scrub_ret;
|
|
}
|
|
|
|
btrfs_info_in_rcu(fs_info,
|
|
"dev_replace from %s (devid %llu) to %s finished",
|
|
btrfs_dev_name(src_device),
|
|
src_device->devid,
|
|
rcu_str_deref(tgt_device->name));
|
|
clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state);
|
|
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);
|
|
tgt_device->commit_bytes_used = src_device->bytes_used;
|
|
|
|
btrfs_assign_next_active_device(src_device, tgt_device);
|
|
|
|
list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
|
|
fs_info->fs_devices->rw_devices++;
|
|
|
|
up_write(&dev_replace->rwsem);
|
|
btrfs_rm_dev_replace_blocked(fs_info);
|
|
|
|
btrfs_rm_dev_replace_remove_srcdev(src_device);
|
|
|
|
btrfs_rm_dev_replace_unblocked(fs_info);
|
|
|
|
/*
|
|
* Increment dev_stats_ccnt so that btrfs_run_dev_stats() will
|
|
* update on-disk dev stats value during commit transaction
|
|
*/
|
|
atomic_inc(&tgt_device->dev_stats_ccnt);
|
|
|
|
/*
|
|
* 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(&fs_info->chunk_mutex);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
|
|
/* replace the sysfs entry */
|
|
btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, src_device);
|
|
btrfs_sysfs_update_devid(tgt_device);
|
|
btrfs_rm_dev_replace_free_srcdev(src_device);
|
|
|
|
/* write back the superblocks */
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (!IS_ERR(trans))
|
|
btrfs_commit_transaction(trans);
|
|
|
|
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;
|
|
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 = em->map_lookup;
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Read progress of device replace status according to the state and last
|
|
* stored position. The value format is the same as for
|
|
* btrfs_dev_replace::progress_1000
|
|
*/
|
|
static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
u64 ret = 0;
|
|
|
|
switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
|
|
ret = 0;
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
|
ret = 1000;
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
ret = div64_u64(dev_replace->cursor_left,
|
|
div_u64(btrfs_device_get_total_bytes(
|
|
dev_replace->srcdev), 1000));
|
|
break;
|
|
}
|
|
|
|
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;
|
|
|
|
down_read(&dev_replace->rwsem);
|
|
/* 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);
|
|
args->status.progress_1000 = btrfs_dev_replace_progress(fs_info);
|
|
up_read(&dev_replace->rwsem);
|
|
}
|
|
|
|
int 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_device *src_device = NULL;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
int result;
|
|
int ret;
|
|
|
|
if (sb_rdonly(fs_info->sb))
|
|
return -EROFS;
|
|
|
|
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
|
|
down_write(&dev_replace->rwsem);
|
|
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;
|
|
up_write(&dev_replace->rwsem);
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
|
|
tgt_device = dev_replace->tgtdev;
|
|
src_device = dev_replace->srcdev;
|
|
up_write(&dev_replace->rwsem);
|
|
ret = btrfs_scrub_cancel(fs_info);
|
|
if (ret < 0) {
|
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
|
|
} else {
|
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
|
/*
|
|
* btrfs_dev_replace_finishing() will handle the
|
|
* cleanup part
|
|
*/
|
|
btrfs_info_in_rcu(fs_info,
|
|
"dev_replace from %s (devid %llu) to %s canceled",
|
|
btrfs_dev_name(src_device), src_device->devid,
|
|
btrfs_dev_name(tgt_device));
|
|
}
|
|
break;
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
|
|
/*
|
|
* Scrub doing the replace isn't running so we need to do the
|
|
* cleanup step of btrfs_dev_replace_finishing() here
|
|
*/
|
|
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
|
|
tgt_device = dev_replace->tgtdev;
|
|
src_device = dev_replace->srcdev;
|
|
dev_replace->tgtdev = NULL;
|
|
dev_replace->srcdev = NULL;
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
|
|
dev_replace->time_stopped = ktime_get_real_seconds();
|
|
dev_replace->item_needs_writeback = 1;
|
|
|
|
up_write(&dev_replace->rwsem);
|
|
|
|
/* Scrub for replace must not be running in suspended state */
|
|
ret = btrfs_scrub_cancel(fs_info);
|
|
ASSERT(ret != -ENOTCONN);
|
|
|
|
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);
|
|
WARN_ON(ret);
|
|
|
|
btrfs_info_in_rcu(fs_info,
|
|
"suspended dev_replace from %s (devid %llu) to %s canceled",
|
|
btrfs_dev_name(src_device), src_device->devid,
|
|
btrfs_dev_name(tgt_device));
|
|
|
|
if (tgt_device)
|
|
btrfs_destroy_dev_replace_tgtdev(tgt_device);
|
|
break;
|
|
default:
|
|
up_write(&dev_replace->rwsem);
|
|
result = -EINVAL;
|
|
}
|
|
|
|
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);
|
|
down_write(&dev_replace->rwsem);
|
|
|
|
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 = ktime_get_real_seconds();
|
|
dev_replace->item_needs_writeback = 1;
|
|
btrfs_info(fs_info, "suspending dev_replace for unmount");
|
|
break;
|
|
}
|
|
|
|
up_write(&dev_replace->rwsem);
|
|
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;
|
|
|
|
down_write(&dev_replace->rwsem);
|
|
|
|
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:
|
|
up_write(&dev_replace->rwsem);
|
|
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'");
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
|
|
up_write(&dev_replace->rwsem);
|
|
return 0;
|
|
}
|
|
up_write(&dev_replace->rwsem);
|
|
|
|
/*
|
|
* This could collide with a paused balance, but the exclusive op logic
|
|
* should never allow both to start and pause. We don't want to allow
|
|
* dev-replace to start anyway.
|
|
*/
|
|
if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
|
|
down_write(&dev_replace->rwsem);
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
|
|
up_write(&dev_replace->rwsem);
|
|
btrfs_info(fs_info,
|
|
"cannot resume dev-replace, other exclusive operation running");
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
u64 progress;
|
|
int ret;
|
|
|
|
progress = btrfs_dev_replace_progress(fs_info);
|
|
progress = div_u64(progress, 10);
|
|
btrfs_info_in_rcu(fs_info,
|
|
"continuing dev_replace from %s (devid %llu) to target %s @%u%%",
|
|
btrfs_dev_name(dev_replace->srcdev),
|
|
dev_replace->srcdev->devid,
|
|
btrfs_dev_name(dev_replace->tgtdev),
|
|
(unsigned int)progress);
|
|
|
|
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 && ret != -ECANCELED);
|
|
|
|
clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
|
|
return 0;
|
|
}
|
|
|
|
int __pure 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 filesystem is remounted
|
|
* in degraded state. This does not stop the
|
|
* dev_replace procedure. It needs to be canceled
|
|
* manually if the cancellation is wanted.
|
|
*/
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
percpu_counter_inc(&fs_info->dev_replace.bio_counter);
|
|
}
|
|
|
|
void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount)
|
|
{
|
|
percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount);
|
|
cond_wake_up_nomb(&fs_info->dev_replace.replace_wait);
|
|
}
|
|
|
|
void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info)
|
|
{
|
|
while (1) {
|
|
percpu_counter_inc(&fs_info->dev_replace.bio_counter);
|
|
if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING,
|
|
&fs_info->fs_state)))
|
|
break;
|
|
|
|
btrfs_bio_counter_dec(fs_info);
|
|
wait_event(fs_info->dev_replace.replace_wait,
|
|
!test_bit(BTRFS_FS_STATE_DEV_REPLACING,
|
|
&fs_info->fs_state));
|
|
}
|
|
}
|