| // 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" |
| |
| static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| int scrub_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); |
| 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 without active item, run 'device scan --forget' on the target device"); |
| 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 list_head *devices; |
| 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); |
| |
| devices = &fs_info->fs_devices->devices; |
| list_for_each_entry(device, 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_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); |
| |
| /* 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; |
| } else if (ret != -ECANCELED) { |
| WARN_ON(ret); |
| } |
| |
| return ret; |
| |
| leave: |
| btrfs_destroy_dev_replace_tgtdev(tgt_device); |
| return ret; |
| } |
| |
| static int btrfs_check_replace_dev_names(struct btrfs_ioctl_dev_replace_args *args) |
| { |
| if (args->start.srcdevid == 0) { |
| if (memchr(args->start.srcdev_name, 0, |
| sizeof(args->start.srcdev_name)) == NULL) |
| return -ENAMETOOLONG; |
| } else { |
| args->start.srcdev_name[0] = 0; |
| } |
| |
| if (memchr(args->start.tgtdev_name, 0, |
| sizeof(args->start.tgtdev_name)) == NULL) |
| return -ENAMETOOLONG; |
| |
| return 0; |
| } |
| |
| 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; |
| } |
| ret = btrfs_check_replace_dev_names(args); |
| if (ret < 0) |
| return ret; |
| |
| 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 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); |
| |
| 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_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; |
| 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 */ |
| btrfs_scrub_cancel(fs_info); |
| |
| trans = btrfs_start_transaction(root, 0); |
| if (IS_ERR(trans)) { |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| return PTR_ERR(trans); |
| } |
| ret = btrfs_commit_transaction(trans); |
| 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)); |
| } |
| } |