| /* |
| * Copyright (C) STRATO AG 2012. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| #include <linux/sched.h> |
| #include <linux/bio.h> |
| #include <linux/slab.h> |
| #include <linux/buffer_head.h> |
| #include <linux/blkdev.h> |
| #include <linux/random.h> |
| #include <linux/iocontext.h> |
| #include <linux/capability.h> |
| #include <linux/kthread.h> |
| #include <linux/math64.h> |
| #include <asm/div64.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_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| char *srcdev_name, |
| struct btrfs_device **device); |
| static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); |
| static int btrfs_dev_replace_kthread(void *data); |
| static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); |
| |
| |
| 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: |
| ret = 0; |
| dev_replace->replace_state = |
| BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; |
| dev_replace->cont_reading_from_srcdev_mode = |
| BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
| dev_replace->replace_state = 0; |
| 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: |
| 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, src_devid, |
| NULL, NULL); |
| dev_replace->tgtdev = btrfs_find_device(fs_info, |
| BTRFS_DEV_REPLACE_DEVID, |
| NULL, NULL); |
| /* |
| * allow 'btrfs dev replace_cancel' if src/tgt device is |
| * missing |
| */ |
| if (!dev_replace->srcdev && |
| !btrfs_test_opt(dev_root, 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(dev_root, 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->is_tgtdev_for_dev_replace = 1; |
| btrfs_init_dev_replace_tgtdev_for_resume(fs_info, |
| dev_replace->tgtdev); |
| } |
| break; |
| } |
| |
| out: |
| if (path) |
| btrfs_free_path(path); |
| 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) |
| { |
| 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; |
| |
| btrfs_dev_replace_lock(dev_replace); |
| if (!dev_replace->is_valid || |
| !dev_replace->item_needs_writeback) { |
| btrfs_dev_replace_unlock(dev_replace); |
| return 0; |
| } |
| btrfs_dev_replace_unlock(dev_replace); |
| |
| 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); |
| |
| btrfs_dev_replace_lock(dev_replace); |
| 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; |
| btrfs_dev_replace_unlock(dev_replace); |
| |
| btrfs_mark_buffer_dirty(eb); |
| |
| out: |
| btrfs_free_path(path); |
| |
| return ret; |
| } |
| |
| void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| |
| dev_replace->committed_cursor_left = |
| dev_replace->cursor_left_last_write_of_item; |
| } |
| |
| int btrfs_dev_replace_start(struct btrfs_root *root, |
| struct btrfs_ioctl_dev_replace_args *args) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_fs_info *fs_info = root->fs_info; |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| int ret; |
| struct btrfs_device *tgt_device = NULL; |
| struct btrfs_device *src_device = NULL; |
| |
| if (btrfs_fs_incompat(fs_info, RAID56)) { |
| btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6"); |
| return -EOPNOTSUPP; |
| } |
| |
| 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; |
| |
| /* |
| * 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, root); |
| if (ret) |
| return ret; |
| } else if (PTR_ERR(trans) != -ENOENT) { |
| return PTR_ERR(trans); |
| } |
| |
| /* the disk copy procedure reuses the scrub code */ |
| mutex_lock(&fs_info->volume_mutex); |
| ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, |
| args->start.srcdev_name, |
| &src_device); |
| if (ret) { |
| mutex_unlock(&fs_info->volume_mutex); |
| return ret; |
| } |
| |
| ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, |
| src_device, &tgt_device); |
| mutex_unlock(&fs_info->volume_mutex); |
| if (ret) |
| return ret; |
| |
| btrfs_dev_replace_lock(dev_replace); |
| switch (dev_replace->replace_state) { |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| break; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
| goto leave; |
| } |
| |
| dev_replace->cont_reading_from_srcdev_mode = |
| args->start.cont_reading_from_srcdev_mode; |
| WARN_ON(!src_device); |
| dev_replace->srcdev = src_device; |
| WARN_ON(!tgt_device); |
| dev_replace->tgtdev = tgt_device; |
| |
| printk_in_rcu(KERN_INFO |
| "BTRFS: dev_replace from %s (devid %llu) to %s started\n", |
| src_device->missing ? "<missing disk>" : |
| rcu_str_deref(src_device->name), |
| src_device->devid, |
| rcu_str_deref(tgt_device->name)); |
| |
| /* |
| * from now on, the writes to the srcdev are all duplicated to |
| * go to the tgtdev as well (refer to btrfs_map_block()). |
| */ |
| dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
| dev_replace->time_started = get_seconds(); |
| dev_replace->cursor_left = 0; |
| dev_replace->committed_cursor_left = 0; |
| dev_replace->cursor_left_last_write_of_item = 0; |
| dev_replace->cursor_right = 0; |
| dev_replace->is_valid = 1; |
| dev_replace->item_needs_writeback = 1; |
| args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| btrfs_dev_replace_unlock(dev_replace); |
| |
| btrfs_wait_ordered_roots(root->fs_info, -1); |
| |
| /* force writing the updated state information to disk */ |
| trans = btrfs_start_transaction(root, 0); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| btrfs_dev_replace_lock(dev_replace); |
| goto leave; |
| } |
| |
| ret = btrfs_commit_transaction(trans, root); |
| WARN_ON(ret); |
| |
| /* the disk copy procedure reuses the scrub code */ |
| ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, |
| src_device->total_bytes, |
| &dev_replace->scrub_progress, 0, 1); |
| |
| ret = btrfs_dev_replace_finishing(root->fs_info, ret); |
| WARN_ON(ret); |
| |
| return 0; |
| |
| leave: |
| dev_replace->srcdev = NULL; |
| dev_replace->tgtdev = NULL; |
| btrfs_dev_replace_unlock(dev_replace); |
| btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| return ret; |
| } |
| |
| /* |
| * blocked until all flighting bios are finished. |
| */ |
| static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) |
| { |
| s64 writers; |
| DEFINE_WAIT(wait); |
| |
| set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
| do { |
| prepare_to_wait(&fs_info->replace_wait, &wait, |
| TASK_UNINTERRUPTIBLE); |
| writers = percpu_counter_sum(&fs_info->bio_counter); |
| if (writers) |
| schedule(); |
| finish_wait(&fs_info->replace_wait, &wait); |
| } while (writers); |
| } |
| |
| /* |
| * we have removed target device, it is safe to allow new bios request. |
| */ |
| static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) |
| { |
| clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
| if (waitqueue_active(&fs_info->replace_wait)) |
| wake_up(&fs_info->replace_wait); |
| } |
| |
| static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| int scrub_ret) |
| { |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| struct btrfs_device *tgt_device; |
| struct btrfs_device *src_device; |
| struct btrfs_root *root = fs_info->tree_root; |
| u8 uuid_tmp[BTRFS_UUID_SIZE]; |
| struct btrfs_trans_handle *trans; |
| int ret = 0; |
| |
| /* don't allow cancel or unmount to disturb the finishing procedure */ |
| mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| |
| btrfs_dev_replace_lock(dev_replace); |
| /* was the operation canceled, or is it finished? */ |
| if (dev_replace->replace_state != |
| BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
| btrfs_dev_replace_unlock(dev_replace); |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| return 0; |
| } |
| |
| tgt_device = dev_replace->tgtdev; |
| src_device = dev_replace->srcdev; |
| btrfs_dev_replace_unlock(dev_replace); |
| |
| /* |
| * flush all outstanding I/O and inode extent mappings before the |
| * copy operation is declared as being finished |
| */ |
| ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
| if (ret) { |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| return ret; |
| } |
| btrfs_wait_ordered_roots(root->fs_info, -1); |
| |
| trans = btrfs_start_transaction(root, 0); |
| if (IS_ERR(trans)) { |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| return PTR_ERR(trans); |
| } |
| ret = btrfs_commit_transaction(trans, root); |
| WARN_ON(ret); |
| |
| /* keep away write_all_supers() during the finishing procedure */ |
| mutex_lock(&root->fs_info->chunk_mutex); |
| mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| btrfs_dev_replace_lock(dev_replace); |
| dev_replace->replace_state = |
| scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED |
| : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; |
| dev_replace->tgtdev = NULL; |
| dev_replace->srcdev = NULL; |
| dev_replace->time_stopped = get_seconds(); |
| dev_replace->item_needs_writeback = 1; |
| |
| /* replace old device with new one in mapping tree */ |
| if (!scrub_ret) { |
| btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
| src_device, |
| tgt_device); |
| } else { |
| printk_in_rcu(KERN_ERR |
| "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", |
| src_device->missing ? "<missing disk>" : |
| rcu_str_deref(src_device->name), |
| src_device->devid, |
| rcu_str_deref(tgt_device->name), scrub_ret); |
| btrfs_dev_replace_unlock(dev_replace); |
| mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| mutex_unlock(&root->fs_info->chunk_mutex); |
| if (tgt_device) |
| btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| |
| return 0; |
| } |
| |
| printk_in_rcu(KERN_INFO |
| "BTRFS: dev_replace from %s (devid %llu) to %s finished\n", |
| src_device->missing ? "<missing disk>" : |
| rcu_str_deref(src_device->name), |
| src_device->devid, |
| rcu_str_deref(tgt_device->name)); |
| tgt_device->is_tgtdev_for_dev_replace = 0; |
| tgt_device->devid = src_device->devid; |
| src_device->devid = BTRFS_DEV_REPLACE_DEVID; |
| memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
| memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); |
| memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); |
| tgt_device->total_bytes = src_device->total_bytes; |
| tgt_device->disk_total_bytes = src_device->disk_total_bytes; |
| ASSERT(list_empty(&src_device->resized_list)); |
| tgt_device->commit_total_bytes = src_device->commit_total_bytes; |
| tgt_device->bytes_used = src_device->bytes_used; |
| if (fs_info->sb->s_bdev == src_device->bdev) |
| fs_info->sb->s_bdev = tgt_device->bdev; |
| if (fs_info->fs_devices->latest_bdev == src_device->bdev) |
| fs_info->fs_devices->latest_bdev = tgt_device->bdev; |
| list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
| if (src_device->fs_devices->seeding) |
| fs_info->fs_devices->rw_devices++; |
| |
| /* replace the sysfs entry */ |
| btrfs_kobj_rm_device(fs_info, src_device); |
| btrfs_kobj_add_device(fs_info, tgt_device); |
| |
| btrfs_dev_replace_unlock(dev_replace); |
| |
| btrfs_rm_dev_replace_blocked(fs_info); |
| |
| btrfs_rm_dev_replace_srcdev(fs_info, src_device); |
| |
| btrfs_rm_dev_replace_unblocked(fs_info); |
| |
| /* |
| * this is again a consistent state where no dev_replace procedure |
| * is running, the target device is part of the filesystem, the |
| * source device is not part of the filesystem anymore and its 1st |
| * superblock is scratched out so that it is no longer marked to |
| * belong to this filesystem. |
| */ |
| mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| mutex_unlock(&root->fs_info->chunk_mutex); |
| |
| /* write back the superblocks */ |
| trans = btrfs_start_transaction(root, 0); |
| if (!IS_ERR(trans)) |
| btrfs_commit_transaction(trans, root); |
| |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| |
| return 0; |
| } |
| |
| static void btrfs_dev_replace_update_device_in_mapping_tree( |
| struct btrfs_fs_info *fs_info, |
| struct btrfs_device *srcdev, |
| struct btrfs_device *tgtdev) |
| { |
| struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
| struct extent_map *em; |
| struct map_lookup *map; |
| u64 start = 0; |
| int i; |
| |
| write_lock(&em_tree->lock); |
| do { |
| em = lookup_extent_mapping(em_tree, start, (u64)-1); |
| if (!em) |
| break; |
| map = (struct map_lookup *)em->bdev; |
| for (i = 0; i < map->num_stripes; i++) |
| if (srcdev == map->stripes[i].dev) |
| map->stripes[i].dev = tgtdev; |
| start = em->start + em->len; |
| free_extent_map(em); |
| } while (start); |
| write_unlock(&em_tree->lock); |
| } |
| |
| static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| char *srcdev_name, |
| struct btrfs_device **device) |
| { |
| int ret; |
| |
| if (srcdevid) { |
| ret = 0; |
| *device = btrfs_find_device(root->fs_info, srcdevid, NULL, |
| NULL); |
| if (!*device) |
| ret = -ENOENT; |
| } else { |
| ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, |
| device); |
| } |
| return ret; |
| } |
| |
| void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
| struct btrfs_ioctl_dev_replace_args *args) |
| { |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| |
| btrfs_dev_replace_lock(dev_replace); |
| /* even if !dev_replace_is_valid, the values are good enough for |
| * the replace_status ioctl */ |
| args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| args->status.replace_state = dev_replace->replace_state; |
| args->status.time_started = dev_replace->time_started; |
| args->status.time_stopped = dev_replace->time_stopped; |
| args->status.num_write_errors = |
| atomic64_read(&dev_replace->num_write_errors); |
| args->status.num_uncorrectable_read_errors = |
| atomic64_read(&dev_replace->num_uncorrectable_read_errors); |
| switch (dev_replace->replace_state) { |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| args->status.progress_1000 = 0; |
| break; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| args->status.progress_1000 = 1000; |
| break; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| args->status.progress_1000 = div64_u64(dev_replace->cursor_left, |
| div64_u64(dev_replace->srcdev->total_bytes, 1000)); |
| break; |
| } |
| btrfs_dev_replace_unlock(dev_replace); |
| } |
| |
| int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, |
| struct btrfs_ioctl_dev_replace_args *args) |
| { |
| args->result = __btrfs_dev_replace_cancel(fs_info); |
| return 0; |
| } |
| |
| static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| struct btrfs_device *tgt_device = NULL; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_root *root = fs_info->tree_root; |
| u64 result; |
| int ret; |
| |
| if (fs_info->sb->s_flags & MS_RDONLY) |
| return -EROFS; |
| |
| mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| btrfs_dev_replace_lock(dev_replace); |
| switch (dev_replace->replace_state) { |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; |
| btrfs_dev_replace_unlock(dev_replace); |
| goto leave; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| tgt_device = dev_replace->tgtdev; |
| dev_replace->tgtdev = NULL; |
| dev_replace->srcdev = NULL; |
| break; |
| } |
| dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; |
| dev_replace->time_stopped = get_seconds(); |
| dev_replace->item_needs_writeback = 1; |
| btrfs_dev_replace_unlock(dev_replace); |
| btrfs_scrub_cancel(fs_info); |
| |
| trans = btrfs_start_transaction(root, 0); |
| if (IS_ERR(trans)) { |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| return PTR_ERR(trans); |
| } |
| ret = btrfs_commit_transaction(trans, root); |
| WARN_ON(ret); |
| if (tgt_device) |
| btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| |
| leave: |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| return result; |
| } |
| |
| void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| |
| mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| btrfs_dev_replace_lock(dev_replace); |
| switch (dev_replace->replace_state) { |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| break; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| dev_replace->replace_state = |
| BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
| dev_replace->time_stopped = get_seconds(); |
| dev_replace->item_needs_writeback = 1; |
| btrfs_info(fs_info, "suspending dev_replace for unmount"); |
| break; |
| } |
| |
| btrfs_dev_replace_unlock(dev_replace); |
| mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| } |
| |
| /* resume dev_replace procedure that was interrupted by unmount */ |
| int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) |
| { |
| struct task_struct *task; |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| |
| btrfs_dev_replace_lock(dev_replace); |
| switch (dev_replace->replace_state) { |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| btrfs_dev_replace_unlock(dev_replace); |
| return 0; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| break; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| dev_replace->replace_state = |
| BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
| break; |
| } |
| if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { |
| btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing"); |
| btrfs_info(fs_info, |
| "you may cancel the operation after 'mount -o degraded'"); |
| btrfs_dev_replace_unlock(dev_replace); |
| return 0; |
| } |
| btrfs_dev_replace_unlock(dev_replace); |
| |
| WARN_ON(atomic_xchg( |
| &fs_info->mutually_exclusive_operation_running, 1)); |
| task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
| return PTR_ERR_OR_ZERO(task); |
| } |
| |
| static int btrfs_dev_replace_kthread(void *data) |
| { |
| struct btrfs_fs_info *fs_info = data; |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| struct btrfs_ioctl_dev_replace_args *status_args; |
| u64 progress; |
| |
| status_args = kzalloc(sizeof(*status_args), GFP_NOFS); |
| if (status_args) { |
| btrfs_dev_replace_status(fs_info, status_args); |
| progress = status_args->status.progress_1000; |
| kfree(status_args); |
| do_div(progress, 10); |
| printk_in_rcu(KERN_INFO |
| "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
| dev_replace->srcdev->missing ? "<missing disk>" : |
| rcu_str_deref(dev_replace->srcdev->name), |
| dev_replace->srcdev->devid, |
| dev_replace->tgtdev ? |
| rcu_str_deref(dev_replace->tgtdev->name) : |
| "<missing target disk>", |
| (unsigned int)progress); |
| } |
| btrfs_dev_replace_continue_on_mount(fs_info); |
| atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
| |
| return 0; |
| } |
| |
| static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| int ret; |
| |
| ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
| dev_replace->committed_cursor_left, |
| dev_replace->srcdev->total_bytes, |
| &dev_replace->scrub_progress, 0, 1); |
| ret = btrfs_dev_replace_finishing(fs_info, ret); |
| WARN_ON(ret); |
| return 0; |
| } |
| |
| int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
| { |
| if (!dev_replace->is_valid) |
| return 0; |
| |
| switch (dev_replace->replace_state) { |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| return 0; |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| /* |
| * return true even if tgtdev is missing (this is |
| * something that can happen if the dev_replace |
| * procedure is suspended by an umount and then |
| * the tgtdev is missing (or "btrfs dev scan") was |
| * not called and the the filesystem is remounted |
| * in degraded state. This does not stop the |
| * dev_replace procedure. It needs to be canceled |
| * manually if the cancelation is wanted. |
| */ |
| break; |
| } |
| return 1; |
| } |
| |
| void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) |
| { |
| /* the beginning is just an optimization for the typical case */ |
| if (atomic_read(&dev_replace->nesting_level) == 0) { |
| acquire_lock: |
| /* this is not a nested case where the same thread |
| * is trying to acqurire the same lock twice */ |
| mutex_lock(&dev_replace->lock); |
| mutex_lock(&dev_replace->lock_management_lock); |
| dev_replace->lock_owner = current->pid; |
| atomic_inc(&dev_replace->nesting_level); |
| mutex_unlock(&dev_replace->lock_management_lock); |
| return; |
| } |
| |
| mutex_lock(&dev_replace->lock_management_lock); |
| if (atomic_read(&dev_replace->nesting_level) > 0 && |
| dev_replace->lock_owner == current->pid) { |
| WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| atomic_inc(&dev_replace->nesting_level); |
| mutex_unlock(&dev_replace->lock_management_lock); |
| return; |
| } |
| |
| mutex_unlock(&dev_replace->lock_management_lock); |
| goto acquire_lock; |
| } |
| |
| void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) |
| { |
| WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| mutex_lock(&dev_replace->lock_management_lock); |
| WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); |
| WARN_ON(dev_replace->lock_owner != current->pid); |
| atomic_dec(&dev_replace->nesting_level); |
| if (atomic_read(&dev_replace->nesting_level) == 0) { |
| dev_replace->lock_owner = 0; |
| mutex_unlock(&dev_replace->lock_management_lock); |
| mutex_unlock(&dev_replace->lock); |
| } else { |
| mutex_unlock(&dev_replace->lock_management_lock); |
| } |
| } |
| |
| void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
| { |
| percpu_counter_inc(&fs_info->bio_counter); |
| } |
| |
| void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) |
| { |
| percpu_counter_dec(&fs_info->bio_counter); |
| |
| if (waitqueue_active(&fs_info->replace_wait)) |
| wake_up(&fs_info->replace_wait); |
| } |
| |
| void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) |
| { |
| DEFINE_WAIT(wait); |
| again: |
| percpu_counter_inc(&fs_info->bio_counter); |
| if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) { |
| btrfs_bio_counter_dec(fs_info); |
| wait_event(fs_info->replace_wait, |
| !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
| &fs_info->fs_state)); |
| goto again; |
| } |
| |
| } |