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e1e0eb43ce
btrfs_init_dev_replace_tgtdev reads certain values from the source
device (such as commit_total_bytes) which are updated during transaction
commit. Currently this function is called before committing any pending
transaction, leading to possibly reading outdated values.
Fix this by moving the function below the transaction commit, at this
point the EXCL_OP bit it set hence once transaction is complete the
total size of the device cannot be changed (it's usually changed by
resize/remove ops which are blocked).
Fixes: 9e271ae27e
("Btrfs: kernel operation should come after user input has been verified")
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1045 lines
31 KiB
C
1045 lines
31 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 "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_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_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->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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}
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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);
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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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up_write(&dev_replace->rwsem);
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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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static char* btrfs_dev_name(struct btrfs_device *device)
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{
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if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
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return "<missing disk>";
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else
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return rcu_str_deref(device->name);
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}
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static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
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const char *tgtdev_name, u64 srcdevid, const char *srcdev_name,
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int read_src)
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{
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struct btrfs_root *root = fs_info->dev_root;
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struct btrfs_trans_handle *trans;
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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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bool need_unlock;
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src_device = btrfs_find_device_by_devspec(fs_info, srcdevid,
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srcdev_name);
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if (IS_ERR(src_device))
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return PTR_ERR(src_device);
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|
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if (btrfs_pinned_by_swapfile(fs_info, src_device)) {
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btrfs_warn_in_rcu(fs_info,
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"cannot replace device %s (devid %llu) due to active swapfile",
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btrfs_dev_name(src_device), src_device->devid);
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return -ETXTBSY;
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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);
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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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|
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ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name,
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src_device, &tgt_device);
|
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if (ret)
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return ret;
|
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|
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need_unlock = true;
|
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down_write(&dev_replace->rwsem);
|
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switch (dev_replace->replace_state) {
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
|
|
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
|
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case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
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|
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;
|
|
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);
|
|
need_unlock = false;
|
|
|
|
ret = btrfs_sysfs_add_device_link(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);
|
|
|
|
/* force writing the updated state information to disk */
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
need_unlock = true;
|
|
down_write(&dev_replace->rwsem);
|
|
dev_replace->replace_state =
|
|
BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED;
|
|
dev_replace->srcdev = NULL;
|
|
dev_replace->tgtdev = NULL;
|
|
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;
|
|
} else if (ret != -ECANCELED) {
|
|
WARN_ON(ret);
|
|
}
|
|
|
|
return ret;
|
|
|
|
leave:
|
|
if (need_unlock)
|
|
up_write(&dev_replace->rwsem);
|
|
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_total_bytes = src_device->commit_total_bytes;
|
|
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_rm_device_link(fs_info->fs_devices, src_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.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 = 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 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));
|
|
}
|
|
}
|