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1340 lines
38 KiB
1340 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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* Copyright (C) STRATO AG 2012. All rights reserved. |
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*/ |
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|
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#include <linux/sched.h> |
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#include <linux/bio.h> |
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#include <linux/slab.h> |
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#include <linux/blkdev.h> |
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#include <linux/kthread.h> |
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#include <linux/math64.h> |
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#include "misc.h" |
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#include "ctree.h" |
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#include "extent_map.h" |
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#include "disk-io.h" |
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#include "transaction.h" |
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#include "print-tree.h" |
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#include "volumes.h" |
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#include "async-thread.h" |
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#include "check-integrity.h" |
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#include "rcu-string.h" |
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#include "dev-replace.h" |
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#include "sysfs.h" |
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#include "zoned.h" |
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#include "block-group.h" |
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|
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/* |
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* Device replace overview |
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* |
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* [Objective] |
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* To copy all extents (both new and on-disk) from source device to target |
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* device, while still keeping the filesystem read-write. |
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* |
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* [Method] |
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* There are two main methods involved: |
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* |
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* - Write duplication |
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* |
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* All new writes will be written to both target and source devices, so even |
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* if replace gets canceled, sources device still contans up-to-date data. |
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* |
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* Location: handle_ops_on_dev_replace() from __btrfs_map_block() |
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* Start: btrfs_dev_replace_start() |
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* End: btrfs_dev_replace_finishing() |
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* Content: Latest data/metadata |
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* |
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* - Copy existing extents |
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* |
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* This happens by re-using scrub facility, as scrub also iterates through |
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* existing extents from commit root. |
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* |
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* Location: scrub_write_block_to_dev_replace() from |
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* scrub_block_complete() |
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* Content: Data/meta from commit root. |
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* |
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* Due to the content difference, we need to avoid nocow write when dev-replace |
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* is happening. This is done by marking the block group read-only and waiting |
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* for NOCOW writes. |
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* |
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* After replace is done, the finishing part is done by swapping the target and |
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* source devices. |
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* |
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* Location: btrfs_dev_replace_update_device_in_mapping_tree() from |
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* btrfs_dev_replace_finishing() |
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*/ |
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|
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static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
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int scrub_ret); |
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static int btrfs_dev_replace_kthread(void *data); |
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|
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int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) |
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{ |
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struct btrfs_key key; |
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struct btrfs_root *dev_root = fs_info->dev_root; |
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
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struct extent_buffer *eb; |
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int slot; |
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int ret = 0; |
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struct btrfs_path *path = NULL; |
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int item_size; |
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struct btrfs_dev_replace_item *ptr; |
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u64 src_devid; |
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|
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if (!dev_root) |
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return 0; |
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|
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path = btrfs_alloc_path(); |
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if (!path) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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|
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key.objectid = 0; |
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key.type = BTRFS_DEV_REPLACE_KEY; |
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key.offset = 0; |
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ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); |
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if (ret) { |
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no_valid_dev_replace_entry_found: |
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/* |
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* We don't have a replace item or it's corrupted. If there is |
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* a replace target, fail the mount. |
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*/ |
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if (btrfs_find_device(fs_info->fs_devices, |
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BTRFS_DEV_REPLACE_DEVID, NULL, NULL)) { |
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btrfs_err(fs_info, |
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"found replace target device without a valid replace item"); |
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ret = -EUCLEAN; |
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goto out; |
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} |
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ret = 0; |
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dev_replace->replace_state = |
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BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
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dev_replace->cont_reading_from_srcdev_mode = |
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BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
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dev_replace->time_started = 0; |
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dev_replace->time_stopped = 0; |
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atomic64_set(&dev_replace->num_write_errors, 0); |
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atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); |
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dev_replace->cursor_left = 0; |
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dev_replace->committed_cursor_left = 0; |
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dev_replace->cursor_left_last_write_of_item = 0; |
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dev_replace->cursor_right = 0; |
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dev_replace->srcdev = NULL; |
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dev_replace->tgtdev = NULL; |
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dev_replace->is_valid = 0; |
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dev_replace->item_needs_writeback = 0; |
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goto out; |
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} |
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slot = path->slots[0]; |
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eb = path->nodes[0]; |
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item_size = btrfs_item_size_nr(eb, slot); |
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ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
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|
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if (item_size != sizeof(struct btrfs_dev_replace_item)) { |
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btrfs_warn(fs_info, |
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"dev_replace entry found has unexpected size, ignore entry"); |
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goto no_valid_dev_replace_entry_found; |
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} |
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|
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src_devid = btrfs_dev_replace_src_devid(eb, ptr); |
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dev_replace->cont_reading_from_srcdev_mode = |
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btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); |
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dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); |
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dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); |
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dev_replace->time_stopped = |
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btrfs_dev_replace_time_stopped(eb, ptr); |
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atomic64_set(&dev_replace->num_write_errors, |
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btrfs_dev_replace_num_write_errors(eb, ptr)); |
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atomic64_set(&dev_replace->num_uncorrectable_read_errors, |
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btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); |
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dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); |
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dev_replace->committed_cursor_left = dev_replace->cursor_left; |
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dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; |
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dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); |
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dev_replace->is_valid = 1; |
|
|
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dev_replace->item_needs_writeback = 0; |
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switch (dev_replace->replace_state) { |
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case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
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case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
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case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
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/* |
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* We don't have an active replace item but if there is a |
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* replace target, fail the mount. |
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*/ |
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if (btrfs_find_device(fs_info->fs_devices, |
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BTRFS_DEV_REPLACE_DEVID, NULL, NULL)) { |
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btrfs_err(fs_info, |
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"replace devid present without an active replace item"); |
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ret = -EUCLEAN; |
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} else { |
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dev_replace->srcdev = NULL; |
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dev_replace->tgtdev = NULL; |
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} |
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break; |
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case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
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case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
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dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, |
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src_devid, NULL, NULL); |
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dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, |
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BTRFS_DEV_REPLACE_DEVID, |
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NULL, NULL); |
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/* |
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* allow 'btrfs dev replace_cancel' if src/tgt device is |
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* missing |
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*/ |
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if (!dev_replace->srcdev && |
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!btrfs_test_opt(fs_info, DEGRADED)) { |
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ret = -EIO; |
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btrfs_warn(fs_info, |
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"cannot mount because device replace operation is ongoing and"); |
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btrfs_warn(fs_info, |
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"srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", |
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src_devid); |
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} |
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if (!dev_replace->tgtdev && |
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!btrfs_test_opt(fs_info, DEGRADED)) { |
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ret = -EIO; |
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btrfs_warn(fs_info, |
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"cannot mount because device replace operation is ongoing and"); |
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btrfs_warn(fs_info, |
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"tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", |
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BTRFS_DEV_REPLACE_DEVID); |
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} |
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if (dev_replace->tgtdev) { |
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if (dev_replace->srcdev) { |
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dev_replace->tgtdev->total_bytes = |
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dev_replace->srcdev->total_bytes; |
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dev_replace->tgtdev->disk_total_bytes = |
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dev_replace->srcdev->disk_total_bytes; |
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dev_replace->tgtdev->commit_total_bytes = |
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dev_replace->srcdev->commit_total_bytes; |
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dev_replace->tgtdev->bytes_used = |
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dev_replace->srcdev->bytes_used; |
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dev_replace->tgtdev->commit_bytes_used = |
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dev_replace->srcdev->commit_bytes_used; |
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} |
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set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
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&dev_replace->tgtdev->dev_state); |
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|
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WARN_ON(fs_info->fs_devices->rw_devices == 0); |
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dev_replace->tgtdev->io_width = fs_info->sectorsize; |
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dev_replace->tgtdev->io_align = fs_info->sectorsize; |
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dev_replace->tgtdev->sector_size = fs_info->sectorsize; |
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dev_replace->tgtdev->fs_info = fs_info; |
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set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, |
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&dev_replace->tgtdev->dev_state); |
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} |
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break; |
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} |
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|
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out: |
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btrfs_free_path(path); |
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return ret; |
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} |
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|
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/* |
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* Initialize a new device for device replace target from a given source dev |
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* and path. |
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* |
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* Return 0 and new device in @device_out, otherwise return < 0 |
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*/ |
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static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, |
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const char *device_path, |
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struct btrfs_device *srcdev, |
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struct btrfs_device **device_out) |
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{ |
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struct btrfs_device *device; |
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struct block_device *bdev; |
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struct rcu_string *name; |
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u64 devid = BTRFS_DEV_REPLACE_DEVID; |
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int ret = 0; |
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|
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*device_out = NULL; |
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if (srcdev->fs_devices->seeding) { |
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btrfs_err(fs_info, "the filesystem is a seed filesystem!"); |
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return -EINVAL; |
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} |
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|
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bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
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fs_info->bdev_holder); |
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if (IS_ERR(bdev)) { |
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btrfs_err(fs_info, "target device %s is invalid!", device_path); |
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return PTR_ERR(bdev); |
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} |
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|
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if (!btrfs_check_device_zone_type(fs_info, bdev)) { |
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btrfs_err(fs_info, |
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"dev-replace: zoned type of target device mismatch with filesystem"); |
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ret = -EINVAL; |
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goto error; |
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} |
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|
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sync_blockdev(bdev); |
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|
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list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { |
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if (device->bdev == bdev) { |
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btrfs_err(fs_info, |
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"target device is in the filesystem!"); |
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ret = -EEXIST; |
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goto error; |
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} |
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} |
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|
|
|
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if (i_size_read(bdev->bd_inode) < |
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btrfs_device_get_total_bytes(srcdev)) { |
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btrfs_err(fs_info, |
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"target device is smaller than source device!"); |
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ret = -EINVAL; |
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goto error; |
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} |
|
|
|
|
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device = btrfs_alloc_device(NULL, &devid, NULL); |
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if (IS_ERR(device)) { |
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ret = PTR_ERR(device); |
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goto error; |
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} |
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|
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name = rcu_string_strdup(device_path, GFP_KERNEL); |
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if (!name) { |
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btrfs_free_device(device); |
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ret = -ENOMEM; |
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goto error; |
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} |
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rcu_assign_pointer(device->name, name); |
|
|
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set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); |
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device->generation = 0; |
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device->io_width = fs_info->sectorsize; |
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device->io_align = fs_info->sectorsize; |
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device->sector_size = fs_info->sectorsize; |
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device->total_bytes = btrfs_device_get_total_bytes(srcdev); |
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device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); |
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device->bytes_used = btrfs_device_get_bytes_used(srcdev); |
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device->commit_total_bytes = srcdev->commit_total_bytes; |
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device->commit_bytes_used = device->bytes_used; |
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device->fs_info = fs_info; |
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device->bdev = bdev; |
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set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); |
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set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); |
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device->mode = FMODE_EXCL; |
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device->dev_stats_valid = 1; |
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set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); |
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device->fs_devices = fs_info->fs_devices; |
|
|
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ret = btrfs_get_dev_zone_info(device); |
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if (ret) |
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goto error; |
|
|
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mutex_lock(&fs_info->fs_devices->device_list_mutex); |
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list_add(&device->dev_list, &fs_info->fs_devices->devices); |
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fs_info->fs_devices->num_devices++; |
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fs_info->fs_devices->open_devices++; |
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mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
|
|
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*device_out = device; |
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return 0; |
|
|
|
error: |
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blkdev_put(bdev, FMODE_EXCL); |
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return ret; |
|
} |
|
|
|
/* |
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* called from commit_transaction. Writes changed device replace state to |
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* disk. |
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*/ |
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int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) |
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{ |
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struct btrfs_fs_info *fs_info = trans->fs_info; |
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int ret; |
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struct btrfs_root *dev_root = fs_info->dev_root; |
|
struct btrfs_path *path; |
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struct btrfs_key key; |
|
struct extent_buffer *eb; |
|
struct btrfs_dev_replace_item *ptr; |
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struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
|
|
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down_read(&dev_replace->rwsem); |
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if (!dev_replace->is_valid || |
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!dev_replace->item_needs_writeback) { |
|
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. |
|
*/ |
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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 mark_block_group_to_copy(struct btrfs_fs_info *fs_info, |
|
struct btrfs_device *src_dev) |
|
{ |
|
struct btrfs_path *path; |
|
struct btrfs_key key; |
|
struct btrfs_key found_key; |
|
struct btrfs_root *root = fs_info->dev_root; |
|
struct btrfs_dev_extent *dev_extent = NULL; |
|
struct btrfs_block_group *cache; |
|
struct btrfs_trans_handle *trans; |
|
int ret = 0; |
|
u64 chunk_offset; |
|
|
|
/* Do not use "to_copy" on non zoned filesystem for now */ |
|
if (!btrfs_is_zoned(fs_info)) |
|
return 0; |
|
|
|
mutex_lock(&fs_info->chunk_mutex); |
|
|
|
/* Ensure we don't have pending new block group */ |
|
spin_lock(&fs_info->trans_lock); |
|
while (fs_info->running_transaction && |
|
!list_empty(&fs_info->running_transaction->dev_update_list)) { |
|
spin_unlock(&fs_info->trans_lock); |
|
mutex_unlock(&fs_info->chunk_mutex); |
|
trans = btrfs_attach_transaction(root); |
|
if (IS_ERR(trans)) { |
|
ret = PTR_ERR(trans); |
|
mutex_lock(&fs_info->chunk_mutex); |
|
if (ret == -ENOENT) { |
|
spin_lock(&fs_info->trans_lock); |
|
continue; |
|
} else { |
|
goto unlock; |
|
} |
|
} |
|
|
|
ret = btrfs_commit_transaction(trans); |
|
mutex_lock(&fs_info->chunk_mutex); |
|
if (ret) |
|
goto unlock; |
|
|
|
spin_lock(&fs_info->trans_lock); |
|
} |
|
spin_unlock(&fs_info->trans_lock); |
|
|
|
path = btrfs_alloc_path(); |
|
if (!path) { |
|
ret = -ENOMEM; |
|
goto unlock; |
|
} |
|
|
|
path->reada = READA_FORWARD; |
|
path->search_commit_root = 1; |
|
path->skip_locking = 1; |
|
|
|
key.objectid = src_dev->devid; |
|
key.type = BTRFS_DEV_EXTENT_KEY; |
|
key.offset = 0; |
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
|
if (ret < 0) |
|
goto free_path; |
|
if (ret > 0) { |
|
if (path->slots[0] >= |
|
btrfs_header_nritems(path->nodes[0])) { |
|
ret = btrfs_next_leaf(root, path); |
|
if (ret < 0) |
|
goto free_path; |
|
if (ret > 0) { |
|
ret = 0; |
|
goto free_path; |
|
} |
|
} else { |
|
ret = 0; |
|
} |
|
} |
|
|
|
while (1) { |
|
struct extent_buffer *leaf = path->nodes[0]; |
|
int slot = path->slots[0]; |
|
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot); |
|
|
|
if (found_key.objectid != src_dev->devid) |
|
break; |
|
|
|
if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
|
break; |
|
|
|
if (found_key.offset < key.offset) |
|
break; |
|
|
|
dev_extent = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent); |
|
|
|
chunk_offset = btrfs_dev_extent_chunk_offset(leaf, dev_extent); |
|
|
|
cache = btrfs_lookup_block_group(fs_info, chunk_offset); |
|
if (!cache) |
|
goto skip; |
|
|
|
spin_lock(&cache->lock); |
|
cache->to_copy = 1; |
|
spin_unlock(&cache->lock); |
|
|
|
btrfs_put_block_group(cache); |
|
|
|
skip: |
|
ret = btrfs_next_item(root, path); |
|
if (ret != 0) { |
|
if (ret > 0) |
|
ret = 0; |
|
break; |
|
} |
|
} |
|
|
|
free_path: |
|
btrfs_free_path(path); |
|
unlock: |
|
mutex_unlock(&fs_info->chunk_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, |
|
struct btrfs_block_group *cache, |
|
u64 physical) |
|
{ |
|
struct btrfs_fs_info *fs_info = cache->fs_info; |
|
struct extent_map *em; |
|
struct map_lookup *map; |
|
u64 chunk_offset = cache->start; |
|
int num_extents, cur_extent; |
|
int i; |
|
|
|
/* Do not use "to_copy" on non zoned filesystem for now */ |
|
if (!btrfs_is_zoned(fs_info)) |
|
return true; |
|
|
|
spin_lock(&cache->lock); |
|
if (cache->removed) { |
|
spin_unlock(&cache->lock); |
|
return true; |
|
} |
|
spin_unlock(&cache->lock); |
|
|
|
em = btrfs_get_chunk_map(fs_info, chunk_offset, 1); |
|
ASSERT(!IS_ERR(em)); |
|
map = em->map_lookup; |
|
|
|
num_extents = cur_extent = 0; |
|
for (i = 0; i < map->num_stripes; i++) { |
|
/* We have more device extent to copy */ |
|
if (srcdev != map->stripes[i].dev) |
|
continue; |
|
|
|
num_extents++; |
|
if (physical == map->stripes[i].physical) |
|
cur_extent = i; |
|
} |
|
|
|
free_extent_map(em); |
|
|
|
if (num_extents > 1 && cur_extent < num_extents - 1) { |
|
/* |
|
* Has more stripes on this device. Keep this block group |
|
* readonly until we finish all the stripes. |
|
*/ |
|
return false; |
|
} |
|
|
|
/* Last stripe on this device */ |
|
spin_lock(&cache->lock); |
|
cache->to_copy = 0; |
|
spin_unlock(&cache->lock); |
|
|
|
return true; |
|
} |
|
|
|
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; |
|
|
|
ret = mark_block_group_to_copy(fs_info, src_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, LONG_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)); |
|
} |
|
}
|
|
|