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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) STRATO AG 2012. All rights reserved.
- */
- #include <linux/sched.h>
- #include <linux/bio.h>
- #include <linux/slab.h>
- #include <linux/blkdev.h>
- #include <linux/kthread.h>
- #include <linux/math64.h>
- #include "misc.h"
- #include "ctree.h"
- #include "extent_map.h"
- #include "disk-io.h"
- #include "transaction.h"
- #include "print-tree.h"
- #include "volumes.h"
- #include "async-thread.h"
- #include "check-integrity.h"
- #include "rcu-string.h"
- #include "dev-replace.h"
- #include "sysfs.h"
- /*
- * Device replace overview
- *
- * [Objective]
- * To copy all extents (both new and on-disk) from source device to target
- * device, while still keeping the filesystem read-write.
- *
- * [Method]
- * There are two main methods involved:
- *
- * - Write duplication
- *
- * All new writes will be written to both target and source devices, so even
- * if replace gets canceled, sources device still contans up-to-date data.
- *
- * Location: handle_ops_on_dev_replace() from __btrfs_map_block()
- * Start: btrfs_dev_replace_start()
- * End: btrfs_dev_replace_finishing()
- * Content: Latest data/metadata
- *
- * - Copy existing extents
- *
- * This happens by re-using scrub facility, as scrub also iterates through
- * existing extents from commit root.
- *
- * Location: scrub_write_block_to_dev_replace() from
- * scrub_block_complete()
- * Content: Data/meta from commit root.
- *
- * Due to the content difference, we need to avoid nocow write when dev-replace
- * is happening. This is done by marking the block group read-only and waiting
- * for NOCOW writes.
- *
- * After replace is done, the finishing part is done by swapping the target and
- * source devices.
- *
- * Location: btrfs_dev_replace_update_device_in_mapping_tree() from
- * btrfs_dev_replace_finishing()
- */
- static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
- int scrub_ret);
- static int btrfs_dev_replace_kthread(void *data);
- int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
- {
- struct btrfs_key key;
- struct btrfs_root *dev_root = fs_info->dev_root;
- struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
- struct extent_buffer *eb;
- int slot;
- int ret = 0;
- struct btrfs_path *path = NULL;
- int item_size;
- struct btrfs_dev_replace_item *ptr;
- u64 src_devid;
- path = btrfs_alloc_path();
- if (!path) {
- ret = -ENOMEM;
- goto out;
- }
- key.objectid = 0;
- key.type = BTRFS_DEV_REPLACE_KEY;
- key.offset = 0;
- ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
- if (ret) {
- no_valid_dev_replace_entry_found:
- /*
- * We don't have a replace item or it's corrupted. If there is
- * a replace target, fail the mount.
- */
- if (btrfs_find_device(fs_info->fs_devices,
- BTRFS_DEV_REPLACE_DEVID, NULL, NULL, false)) {
- btrfs_err(fs_info,
- "found replace target device without a valid replace item");
- ret = -EUCLEAN;
- goto out;
- }
- ret = 0;
- dev_replace->replace_state =
- BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED;
- dev_replace->cont_reading_from_srcdev_mode =
- BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
- dev_replace->time_started = 0;
- dev_replace->time_stopped = 0;
- atomic64_set(&dev_replace->num_write_errors, 0);
- atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
- 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->srcdev = NULL;
- dev_replace->tgtdev = NULL;
- dev_replace->is_valid = 0;
- dev_replace->item_needs_writeback = 0;
- goto out;
- }
- slot = path->slots[0];
- eb = path->nodes[0];
- item_size = btrfs_item_size_nr(eb, slot);
- ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item);
- if (item_size != sizeof(struct btrfs_dev_replace_item)) {
- btrfs_warn(fs_info,
- "dev_replace entry found has unexpected size, ignore entry");
- goto no_valid_dev_replace_entry_found;
- }
- src_devid = btrfs_dev_replace_src_devid(eb, ptr);
- dev_replace->cont_reading_from_srcdev_mode =
- btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr);
- dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr);
- dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr);
- dev_replace->time_stopped =
- btrfs_dev_replace_time_stopped(eb, ptr);
- atomic64_set(&dev_replace->num_write_errors,
- btrfs_dev_replace_num_write_errors(eb, ptr));
- atomic64_set(&dev_replace->num_uncorrectable_read_errors,
- btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
- dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr);
- dev_replace->committed_cursor_left = dev_replace->cursor_left;
- dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left;
- dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr);
- dev_replace->is_valid = 1;
- dev_replace->item_needs_writeback = 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:
- /*
- * We don't have an active replace item but if there is a
- * replace target, fail the mount.
- */
- if (btrfs_find_device(fs_info->fs_devices,
- BTRFS_DEV_REPLACE_DEVID, NULL, NULL, false)) {
- btrfs_err(fs_info,
- "replace devid present without an active replace item");
- ret = -EUCLEAN;
- } else {
- dev_replace->srcdev = NULL;
- dev_replace->tgtdev = NULL;
- }
- break;
- case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
- case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
- dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices,
- src_devid, NULL, NULL, true);
- dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices,
- BTRFS_DEV_REPLACE_DEVID,
- NULL, NULL, true);
- /*
- * allow 'btrfs dev replace_cancel' if src/tgt device is
- * missing
- */
- if (!dev_replace->srcdev &&
- !btrfs_test_opt(fs_info, DEGRADED)) {
- ret = -EIO;
- btrfs_warn(fs_info,
- "cannot mount because device replace operation is ongoing and");
- btrfs_warn(fs_info,
- "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
- src_devid);
- }
- if (!dev_replace->tgtdev &&
- !btrfs_test_opt(fs_info, DEGRADED)) {
- ret = -EIO;
- btrfs_warn(fs_info,
- "cannot mount because device replace operation is ongoing and");
- btrfs_warn(fs_info,
- "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?",
- BTRFS_DEV_REPLACE_DEVID);
- }
- if (dev_replace->tgtdev) {
- if (dev_replace->srcdev) {
- dev_replace->tgtdev->total_bytes =
- dev_replace->srcdev->total_bytes;
- dev_replace->tgtdev->disk_total_bytes =
- dev_replace->srcdev->disk_total_bytes;
- dev_replace->tgtdev->commit_total_bytes =
- dev_replace->srcdev->commit_total_bytes;
- dev_replace->tgtdev->bytes_used =
- dev_replace->srcdev->bytes_used;
- dev_replace->tgtdev->commit_bytes_used =
- dev_replace->srcdev->commit_bytes_used;
- }
- set_bit(BTRFS_DEV_STATE_REPLACE_TGT,
- &dev_replace->tgtdev->dev_state);
- WARN_ON(fs_info->fs_devices->rw_devices == 0);
- dev_replace->tgtdev->io_width = fs_info->sectorsize;
- dev_replace->tgtdev->io_align = fs_info->sectorsize;
- dev_replace->tgtdev->sector_size = fs_info->sectorsize;
- dev_replace->tgtdev->fs_info = fs_info;
- set_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
- &dev_replace->tgtdev->dev_state);
- }
- break;
- }
- out:
- btrfs_free_path(path);
- return ret;
- }
- /*
- * Initialize a new device for device replace target from a given source dev
- * and path.
- *
- * Return 0 and new device in @device_out, otherwise return < 0
- */
- static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
- const char *device_path,
- struct btrfs_device *srcdev,
- struct btrfs_device **device_out)
- {
- struct btrfs_device *device;
- struct block_device *bdev;
- struct rcu_string *name;
- u64 devid = BTRFS_DEV_REPLACE_DEVID;
- int ret = 0;
- *device_out = NULL;
- if (srcdev->fs_devices->seeding) {
- btrfs_err(fs_info, "the filesystem is a seed filesystem!");
- return -EINVAL;
- }
- bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
- fs_info->bdev_holder);
- if (IS_ERR(bdev)) {
- btrfs_err(fs_info, "target device %s is invalid!", device_path);
- return PTR_ERR(bdev);
- }
- sync_blockdev(bdev);
- list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
- if (device->bdev == bdev) {
- btrfs_err(fs_info,
- "target device is in the filesystem!");
- ret = -EEXIST;
- goto error;
- }
- }
- if (i_size_read(bdev->bd_inode) <
- btrfs_device_get_total_bytes(srcdev)) {
- btrfs_err(fs_info,
- "target device is smaller than source device!");
- ret = -EINVAL;
- goto error;
- }
- device = btrfs_alloc_device(NULL, &devid, NULL);
- if (IS_ERR(device)) {
- ret = PTR_ERR(device);
- goto error;
- }
- name = rcu_string_strdup(device_path, GFP_KERNEL);
- if (!name) {
- btrfs_free_device(device);
- ret = -ENOMEM;
- goto error;
- }
- rcu_assign_pointer(device->name, name);
- set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
- device->generation = 0;
- device->io_width = fs_info->sectorsize;
- device->io_align = fs_info->sectorsize;
- device->sector_size = fs_info->sectorsize;
- device->total_bytes = btrfs_device_get_total_bytes(srcdev);
- device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev);
- device->bytes_used = btrfs_device_get_bytes_used(srcdev);
- device->commit_total_bytes = srcdev->commit_total_bytes;
- device->commit_bytes_used = device->bytes_used;
- device->fs_info = fs_info;
- device->bdev = bdev;
- set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
- set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
- device->mode = FMODE_EXCL;
- device->dev_stats_valid = 1;
- set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
- device->fs_devices = fs_info->fs_devices;
- mutex_lock(&fs_info->fs_devices->device_list_mutex);
- list_add(&device->dev_list, &fs_info->fs_devices->devices);
- fs_info->fs_devices->num_devices++;
- fs_info->fs_devices->open_devices++;
- mutex_unlock(&fs_info->fs_devices->device_list_mutex);
- *device_out = device;
- return 0;
- error:
- blkdev_put(bdev, FMODE_EXCL);
- return ret;
- }
- /*
- * called from commit_transaction. Writes changed device replace state to
- * disk.
- */
- int btrfs_run_dev_replace(struct btrfs_trans_handle *trans)
- {
- struct btrfs_fs_info *fs_info = trans->fs_info;
- int ret;
- struct btrfs_root *dev_root = fs_info->dev_root;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct extent_buffer *eb;
- struct btrfs_dev_replace_item *ptr;
- struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
- down_read(&dev_replace->rwsem);
- if (!dev_replace->is_valid ||
- !dev_replace->item_needs_writeback) {
- up_read(&dev_replace->rwsem);
- return 0;
- }
- up_read(&dev_replace->rwsem);
- key.objectid = 0;
- key.type = BTRFS_DEV_REPLACE_KEY;
- key.offset = 0;
- path = btrfs_alloc_path();
- if (!path) {
- ret = -ENOMEM;
- goto out;
- }
- ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
- if (ret < 0) {
- btrfs_warn(fs_info,
- "error %d while searching for dev_replace item!",
- ret);
- goto out;
- }
- if (ret == 0 &&
- btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
- /*
- * need to delete old one and insert a new one.
- * Since no attempt is made to recover any old state, if the
- * dev_replace state is 'running', the data on the target
- * drive is lost.
- * It would be possible to recover the state: just make sure
- * that the beginning of the item is never changed and always
- * contains all the essential information. Then read this
- * minimal set of information and use it as a base for the
- * new state.
- */
- ret = btrfs_del_item(trans, dev_root, path);
- if (ret != 0) {
- btrfs_warn(fs_info,
- "delete too small dev_replace item failed %d!",
- ret);
- goto out;
- }
- ret = 1;
- }
- if (ret == 1) {
- /* need to insert a new item */
- btrfs_release_path(path);
- ret = btrfs_insert_empty_item(trans, dev_root, path,
- &key, sizeof(*ptr));
- if (ret < 0) {
- btrfs_warn(fs_info,
- "insert dev_replace item failed %d!", ret);
- goto out;
- }
- }
- eb = path->nodes[0];
- ptr = btrfs_item_ptr(eb, path->slots[0],
- struct btrfs_dev_replace_item);
- down_write(&dev_replace->rwsem);
- if (dev_replace->srcdev)
- btrfs_set_dev_replace_src_devid(eb, ptr,
- dev_replace->srcdev->devid);
- else
- btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1);
- btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr,
- dev_replace->cont_reading_from_srcdev_mode);
- btrfs_set_dev_replace_replace_state(eb, ptr,
- dev_replace->replace_state);
- 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,
- atomic64_read(&dev_replace->num_write_errors));
- btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
- 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_device(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);
- }
- /*
- * When finishing the device replace, before swapping the source device with the
- * target device we must update the chunk allocation state in the target device,
- * as it is empty because replace works by directly copying the chunks and not
- * through the normal chunk allocation path.
- */
- static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev,
- struct btrfs_device *tgtdev)
- {
- struct extent_state *cached_state = NULL;
- u64 start = 0;
- u64 found_start;
- u64 found_end;
- int ret = 0;
- lockdep_assert_held(&srcdev->fs_info->chunk_mutex);
- while (!find_first_extent_bit(&srcdev->alloc_state, start,
- &found_start, &found_end,
- CHUNK_ALLOCATED, &cached_state)) {
- ret = set_extent_bits(&tgtdev->alloc_state, found_start,
- found_end, CHUNK_ALLOCATED);
- if (ret)
- break;
- start = found_end + 1;
- }
- free_extent_state(cached_state);
- return ret;
- }
- 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);
- }
- 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, U64_MAX, false);
- if (ret) {
- mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
- return ret;
- }
- btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
- if (!scrub_ret)
- btrfs_reada_remove_dev(src_device);
- /*
- * 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)) {
- btrfs_reada_undo_remove_dev(src_device);
- 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;
- /*
- * Update allocation state in the new device and replace the old device
- * with the new one in the mapping tree.
- */
- if (!scrub_ret) {
- scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device);
- if (scrub_ret)
- goto error;
- 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);
- error:
- up_write(&dev_replace->rwsem);
- mutex_unlock(&fs_info->chunk_mutex);
- mutex_unlock(&fs_info->fs_devices->device_list_mutex);
- btrfs_reada_undo_remove_dev(src_device);
- 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_device(src_device);
- btrfs_sysfs_update_devid(tgt_device);
- if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state))
- btrfs_scratch_superblocks(fs_info, src_device->bdev,
- src_device->name->str);
- /* 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);
- btrfs_rm_dev_replace_free_srcdev(src_device);
- return 0;
- }
- /*
- * 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 (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
- 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);
- btrfs_exclop_finish(fs_info);
- 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));
- }
- }
|