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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1493 lines
36 KiB
C
1493 lines
36 KiB
C
![]() |
/*
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* Copyright (C) 2011 STRATO. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/sched.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include "ctree.h"
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#include "volumes.h"
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#include "disk-io.h"
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#include "ordered-data.h"
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/*
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* This is only the first step towards a full-features scrub. It reads all
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* extent and super block and verifies the checksums. In case a bad checksum
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* is found or the extent cannot be read, good data will be written back if
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* any can be found.
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*
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* Future enhancements:
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* - To enhance the performance, better read-ahead strategies for the
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* extent-tree can be employed.
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* - In case an unrepairable extent is encountered, track which files are
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* affected and report them
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* - In case of a read error on files with nodatasum, map the file and read
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* the extent to trigger a writeback of the good copy
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* - track and record media errors, throw out bad devices
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* - add a readonly mode
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* - add a mode to also read unallocated space
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* - make the prefetch cancellable
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*/
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struct scrub_bio;
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struct scrub_page;
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struct scrub_dev;
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struct scrub_fixup;
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static void scrub_bio_end_io(struct bio *bio, int err);
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static void scrub_checksum(struct btrfs_work *work);
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static int scrub_checksum_data(struct scrub_dev *sdev,
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struct scrub_page *spag, void *buffer);
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static int scrub_checksum_tree_block(struct scrub_dev *sdev,
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struct scrub_page *spag, u64 logical,
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void *buffer);
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static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer);
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static void scrub_recheck_end_io(struct bio *bio, int err);
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static void scrub_fixup_worker(struct btrfs_work *work);
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static void scrub_fixup(struct scrub_fixup *fixup);
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#define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */
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#define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */
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struct scrub_page {
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u64 flags; /* extent flags */
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u64 generation;
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u64 mirror_num;
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int have_csum;
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u8 csum[BTRFS_CSUM_SIZE];
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};
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struct scrub_bio {
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int index;
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struct scrub_dev *sdev;
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struct bio *bio;
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int err;
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u64 logical;
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u64 physical;
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struct scrub_page spag[SCRUB_PAGES_PER_BIO];
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u64 count;
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int next_free;
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struct btrfs_work work;
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};
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struct scrub_dev {
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struct scrub_bio *bios[SCRUB_BIOS_PER_DEV];
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struct btrfs_device *dev;
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int first_free;
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int curr;
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atomic_t in_flight;
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spinlock_t list_lock;
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wait_queue_head_t list_wait;
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u16 csum_size;
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struct list_head csum_list;
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atomic_t cancel_req;
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/*
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* statistics
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*/
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struct btrfs_scrub_progress stat;
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spinlock_t stat_lock;
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};
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struct scrub_fixup {
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struct scrub_dev *sdev;
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struct bio *bio;
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u64 logical;
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u64 physical;
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struct scrub_page spag;
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struct btrfs_work work;
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int err;
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int recheck;
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};
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static void scrub_free_csums(struct scrub_dev *sdev)
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{
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while (!list_empty(&sdev->csum_list)) {
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struct btrfs_ordered_sum *sum;
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sum = list_first_entry(&sdev->csum_list,
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struct btrfs_ordered_sum, list);
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list_del(&sum->list);
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kfree(sum);
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}
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}
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static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev)
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{
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int i;
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int j;
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struct page *last_page;
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if (!sdev)
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return;
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for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) {
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struct scrub_bio *sbio = sdev->bios[i];
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struct bio *bio;
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if (!sbio)
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break;
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bio = sbio->bio;
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if (bio) {
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last_page = NULL;
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for (j = 0; j < bio->bi_vcnt; ++j) {
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if (bio->bi_io_vec[j].bv_page == last_page)
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continue;
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last_page = bio->bi_io_vec[j].bv_page;
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__free_page(last_page);
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}
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bio_put(bio);
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}
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kfree(sbio);
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}
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scrub_free_csums(sdev);
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kfree(sdev);
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}
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static noinline_for_stack
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struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev)
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{
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struct scrub_dev *sdev;
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int i;
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int j;
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int ret;
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struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
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sdev = kzalloc(sizeof(*sdev), GFP_NOFS);
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if (!sdev)
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goto nomem;
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sdev->dev = dev;
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for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) {
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struct bio *bio;
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struct scrub_bio *sbio;
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sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
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if (!sbio)
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goto nomem;
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sdev->bios[i] = sbio;
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bio = bio_kmalloc(GFP_NOFS, SCRUB_PAGES_PER_BIO);
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if (!bio)
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goto nomem;
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sbio->index = i;
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sbio->sdev = sdev;
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sbio->bio = bio;
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sbio->count = 0;
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sbio->work.func = scrub_checksum;
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bio->bi_private = sdev->bios[i];
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bio->bi_end_io = scrub_bio_end_io;
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bio->bi_sector = 0;
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bio->bi_bdev = dev->bdev;
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bio->bi_size = 0;
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for (j = 0; j < SCRUB_PAGES_PER_BIO; ++j) {
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struct page *page;
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page = alloc_page(GFP_NOFS);
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if (!page)
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goto nomem;
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ret = bio_add_page(bio, page, PAGE_SIZE, 0);
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if (!ret)
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goto nomem;
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}
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WARN_ON(bio->bi_vcnt != SCRUB_PAGES_PER_BIO);
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if (i != SCRUB_BIOS_PER_DEV-1)
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sdev->bios[i]->next_free = i + 1;
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else
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sdev->bios[i]->next_free = -1;
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}
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sdev->first_free = 0;
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sdev->curr = -1;
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atomic_set(&sdev->in_flight, 0);
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atomic_set(&sdev->cancel_req, 0);
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sdev->csum_size = btrfs_super_csum_size(&fs_info->super_copy);
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INIT_LIST_HEAD(&sdev->csum_list);
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spin_lock_init(&sdev->list_lock);
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spin_lock_init(&sdev->stat_lock);
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init_waitqueue_head(&sdev->list_wait);
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return sdev;
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nomem:
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scrub_free_dev(sdev);
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return ERR_PTR(-ENOMEM);
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}
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/*
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* scrub_recheck_error gets called when either verification of the page
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* failed or the bio failed to read, e.g. with EIO. In the latter case,
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* recheck_error gets called for every page in the bio, even though only
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* one may be bad
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*/
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static void scrub_recheck_error(struct scrub_bio *sbio, int ix)
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{
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struct scrub_dev *sdev = sbio->sdev;
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struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
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struct bio *bio = NULL;
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struct page *page = NULL;
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struct scrub_fixup *fixup = NULL;
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int ret;
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/*
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* while we're in here we do not want the transaction to commit.
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* To prevent it, we increment scrubs_running. scrub_pause will
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* have to wait until we're finished
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* we can safely increment scrubs_running here, because we're
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* in the context of the original bio which is still marked in_flight
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*/
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atomic_inc(&fs_info->scrubs_running);
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fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
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if (!fixup)
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goto malloc_error;
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fixup->logical = sbio->logical + ix * PAGE_SIZE;
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fixup->physical = sbio->physical + ix * PAGE_SIZE;
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fixup->spag = sbio->spag[ix];
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fixup->sdev = sdev;
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bio = bio_alloc(GFP_NOFS, 1);
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if (!bio)
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goto malloc_error;
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bio->bi_private = fixup;
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bio->bi_size = 0;
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bio->bi_bdev = sdev->dev->bdev;
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fixup->bio = bio;
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fixup->recheck = 0;
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page = alloc_page(GFP_NOFS);
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if (!page)
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goto malloc_error;
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ret = bio_add_page(bio, page, PAGE_SIZE, 0);
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if (!ret)
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goto malloc_error;
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if (!sbio->err) {
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/*
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* shorter path: just a checksum error, go ahead and correct it
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*/
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scrub_fixup_worker(&fixup->work);
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return;
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}
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|
|
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/*
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* an I/O-error occured for one of the blocks in the bio, not
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* necessarily for this one, so first try to read it separately
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*/
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fixup->work.func = scrub_fixup_worker;
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fixup->recheck = 1;
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bio->bi_end_io = scrub_recheck_end_io;
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|
bio->bi_sector = fixup->physical >> 9;
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|
bio->bi_bdev = sdev->dev->bdev;
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submit_bio(0, bio);
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|
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|
return;
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|
|
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|
malloc_error:
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|
if (bio)
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bio_put(bio);
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|
if (page)
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|
__free_page(page);
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|
kfree(fixup);
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|
spin_lock(&sdev->stat_lock);
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|
++sdev->stat.malloc_errors;
|
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|
spin_unlock(&sdev->stat_lock);
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|
atomic_dec(&fs_info->scrubs_running);
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|
wake_up(&fs_info->scrub_pause_wait);
|
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|
}
|
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|
|
||
|
static void scrub_recheck_end_io(struct bio *bio, int err)
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|
{
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|
struct scrub_fixup *fixup = bio->bi_private;
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|
struct btrfs_fs_info *fs_info = fixup->sdev->dev->dev_root->fs_info;
|
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|
|
||
|
fixup->err = err;
|
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|
btrfs_queue_worker(&fs_info->scrub_workers, &fixup->work);
|
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|
}
|
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|
|
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|
static int scrub_fixup_check(struct scrub_fixup *fixup)
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|
{
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||
|
int ret = 1;
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|
struct page *page;
|
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|
void *buffer;
|
||
|
u64 flags = fixup->spag.flags;
|
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|
|
||
|
page = fixup->bio->bi_io_vec[0].bv_page;
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|
buffer = kmap_atomic(page, KM_USER0);
|
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|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
||
|
ret = scrub_checksum_data(fixup->sdev,
|
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|
&fixup->spag, buffer);
|
||
|
} else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
||
|
ret = scrub_checksum_tree_block(fixup->sdev,
|
||
|
&fixup->spag,
|
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|
fixup->logical,
|
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|
buffer);
|
||
|
} else {
|
||
|
WARN_ON(1);
|
||
|
}
|
||
|
kunmap_atomic(buffer, KM_USER0);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static void scrub_fixup_worker(struct btrfs_work *work)
|
||
|
{
|
||
|
struct scrub_fixup *fixup;
|
||
|
struct btrfs_fs_info *fs_info;
|
||
|
u64 flags;
|
||
|
int ret = 1;
|
||
|
|
||
|
fixup = container_of(work, struct scrub_fixup, work);
|
||
|
fs_info = fixup->sdev->dev->dev_root->fs_info;
|
||
|
flags = fixup->spag.flags;
|
||
|
|
||
|
if (fixup->recheck && fixup->err == 0)
|
||
|
ret = scrub_fixup_check(fixup);
|
||
|
|
||
|
if (ret || fixup->err)
|
||
|
scrub_fixup(fixup);
|
||
|
|
||
|
__free_page(fixup->bio->bi_io_vec[0].bv_page);
|
||
|
bio_put(fixup->bio);
|
||
|
|
||
|
atomic_dec(&fs_info->scrubs_running);
|
||
|
wake_up(&fs_info->scrub_pause_wait);
|
||
|
|
||
|
kfree(fixup);
|
||
|
}
|
||
|
|
||
|
static void scrub_fixup_end_io(struct bio *bio, int err)
|
||
|
{
|
||
|
complete((struct completion *)bio->bi_private);
|
||
|
}
|
||
|
|
||
|
static void scrub_fixup(struct scrub_fixup *fixup)
|
||
|
{
|
||
|
struct scrub_dev *sdev = fixup->sdev;
|
||
|
struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
|
||
|
struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
|
||
|
struct btrfs_multi_bio *multi = NULL;
|
||
|
struct bio *bio = fixup->bio;
|
||
|
u64 length;
|
||
|
int i;
|
||
|
int ret;
|
||
|
DECLARE_COMPLETION_ONSTACK(complete);
|
||
|
|
||
|
if ((fixup->spag.flags & BTRFS_EXTENT_FLAG_DATA) &&
|
||
|
(fixup->spag.have_csum == 0)) {
|
||
|
/*
|
||
|
* nodatasum, don't try to fix anything
|
||
|
* FIXME: we can do better, open the inode and trigger a
|
||
|
* writeback
|
||
|
*/
|
||
|
goto uncorrectable;
|
||
|
}
|
||
|
|
||
|
length = PAGE_SIZE;
|
||
|
ret = btrfs_map_block(map_tree, REQ_WRITE, fixup->logical, &length,
|
||
|
&multi, 0);
|
||
|
if (ret || !multi || length < PAGE_SIZE) {
|
||
|
printk(KERN_ERR
|
||
|
"scrub_fixup: btrfs_map_block failed us for %llu\n",
|
||
|
(unsigned long long)fixup->logical);
|
||
|
WARN_ON(1);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (multi->num_stripes == 1) {
|
||
|
/* there aren't any replicas */
|
||
|
goto uncorrectable;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* first find a good copy
|
||
|
*/
|
||
|
for (i = 0; i < multi->num_stripes; ++i) {
|
||
|
if (i == fixup->spag.mirror_num)
|
||
|
continue;
|
||
|
|
||
|
bio->bi_sector = multi->stripes[i].physical >> 9;
|
||
|
bio->bi_bdev = multi->stripes[i].dev->bdev;
|
||
|
bio->bi_size = PAGE_SIZE;
|
||
|
bio->bi_next = NULL;
|
||
|
bio->bi_flags |= 1 << BIO_UPTODATE;
|
||
|
bio->bi_comp_cpu = -1;
|
||
|
bio->bi_end_io = scrub_fixup_end_io;
|
||
|
bio->bi_private = &complete;
|
||
|
|
||
|
submit_bio(0, bio);
|
||
|
|
||
|
wait_for_completion(&complete);
|
||
|
|
||
|
if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
|
||
|
/* I/O-error, this is not a good copy */
|
||
|
continue;
|
||
|
|
||
|
ret = scrub_fixup_check(fixup);
|
||
|
if (ret == 0)
|
||
|
break;
|
||
|
}
|
||
|
if (i == multi->num_stripes)
|
||
|
goto uncorrectable;
|
||
|
|
||
|
/*
|
||
|
* the bio now contains good data, write it back
|
||
|
*/
|
||
|
bio->bi_sector = fixup->physical >> 9;
|
||
|
bio->bi_bdev = sdev->dev->bdev;
|
||
|
bio->bi_size = PAGE_SIZE;
|
||
|
bio->bi_next = NULL;
|
||
|
bio->bi_flags |= 1 << BIO_UPTODATE;
|
||
|
bio->bi_comp_cpu = -1;
|
||
|
bio->bi_end_io = scrub_fixup_end_io;
|
||
|
bio->bi_private = &complete;
|
||
|
|
||
|
submit_bio(REQ_WRITE, bio);
|
||
|
|
||
|
wait_for_completion(&complete);
|
||
|
|
||
|
if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
|
||
|
/* I/O-error, writeback failed, give up */
|
||
|
goto uncorrectable;
|
||
|
|
||
|
kfree(multi);
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
++sdev->stat.corrected_errors;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
|
||
|
if (printk_ratelimit())
|
||
|
printk(KERN_ERR "btrfs: fixed up at %llu\n",
|
||
|
(unsigned long long)fixup->logical);
|
||
|
return;
|
||
|
|
||
|
uncorrectable:
|
||
|
kfree(multi);
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
++sdev->stat.uncorrectable_errors;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
|
||
|
if (printk_ratelimit())
|
||
|
printk(KERN_ERR "btrfs: unable to fixup at %llu\n",
|
||
|
(unsigned long long)fixup->logical);
|
||
|
}
|
||
|
|
||
|
static void scrub_bio_end_io(struct bio *bio, int err)
|
||
|
{
|
||
|
struct scrub_bio *sbio = bio->bi_private;
|
||
|
struct scrub_dev *sdev = sbio->sdev;
|
||
|
struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
|
||
|
|
||
|
sbio->err = err;
|
||
|
|
||
|
btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work);
|
||
|
}
|
||
|
|
||
|
static void scrub_checksum(struct btrfs_work *work)
|
||
|
{
|
||
|
struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
|
||
|
struct scrub_dev *sdev = sbio->sdev;
|
||
|
struct page *page;
|
||
|
void *buffer;
|
||
|
int i;
|
||
|
u64 flags;
|
||
|
u64 logical;
|
||
|
int ret;
|
||
|
|
||
|
if (sbio->err) {
|
||
|
struct bio *bio;
|
||
|
struct bio *old_bio;
|
||
|
|
||
|
for (i = 0; i < sbio->count; ++i)
|
||
|
scrub_recheck_error(sbio, i);
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
++sdev->stat.read_errors;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
|
||
|
/*
|
||
|
* FIXME: allocate a new bio after a media error. I haven't
|
||
|
* figured out how to reuse this one
|
||
|
*/
|
||
|
old_bio = sbio->bio;
|
||
|
bio = bio_kmalloc(GFP_NOFS, SCRUB_PAGES_PER_BIO);
|
||
|
if (!bio) {
|
||
|
/*
|
||
|
* alloc failed. cancel the scrub and don't requeue
|
||
|
* this sbio
|
||
|
*/
|
||
|
printk(KERN_ERR "btrfs scrub: allocation failure, "
|
||
|
"cancelling scrub\n");
|
||
|
atomic_inc(&sdev->dev->dev_root->fs_info->
|
||
|
scrub_cancel_req);
|
||
|
goto out_no_enqueue;
|
||
|
}
|
||
|
sbio->bio = bio;
|
||
|
bio->bi_private = sbio;
|
||
|
bio->bi_end_io = scrub_bio_end_io;
|
||
|
bio->bi_sector = 0;
|
||
|
bio->bi_bdev = sbio->sdev->dev->bdev;
|
||
|
bio->bi_size = 0;
|
||
|
for (i = 0; i < SCRUB_PAGES_PER_BIO; ++i) {
|
||
|
struct page *page;
|
||
|
page = old_bio->bi_io_vec[i].bv_page;
|
||
|
bio_add_page(bio, page, PAGE_SIZE, 0);
|
||
|
}
|
||
|
bio_put(old_bio);
|
||
|
goto out;
|
||
|
}
|
||
|
for (i = 0; i < sbio->count; ++i) {
|
||
|
page = sbio->bio->bi_io_vec[i].bv_page;
|
||
|
buffer = kmap_atomic(page, KM_USER0);
|
||
|
flags = sbio->spag[i].flags;
|
||
|
logical = sbio->logical + i * PAGE_SIZE;
|
||
|
ret = 0;
|
||
|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
||
|
ret = scrub_checksum_data(sdev, sbio->spag + i, buffer);
|
||
|
} else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
||
|
ret = scrub_checksum_tree_block(sdev, sbio->spag + i,
|
||
|
logical, buffer);
|
||
|
} else if (flags & BTRFS_EXTENT_FLAG_SUPER) {
|
||
|
BUG_ON(i);
|
||
|
(void)scrub_checksum_super(sbio, buffer);
|
||
|
} else {
|
||
|
WARN_ON(1);
|
||
|
}
|
||
|
kunmap_atomic(buffer, KM_USER0);
|
||
|
if (ret)
|
||
|
scrub_recheck_error(sbio, i);
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
spin_lock(&sdev->list_lock);
|
||
|
sbio->next_free = sdev->first_free;
|
||
|
sdev->first_free = sbio->index;
|
||
|
spin_unlock(&sdev->list_lock);
|
||
|
out_no_enqueue:
|
||
|
atomic_dec(&sdev->in_flight);
|
||
|
wake_up(&sdev->list_wait);
|
||
|
}
|
||
|
|
||
|
static int scrub_checksum_data(struct scrub_dev *sdev,
|
||
|
struct scrub_page *spag, void *buffer)
|
||
|
{
|
||
|
u8 csum[BTRFS_CSUM_SIZE];
|
||
|
u32 crc = ~(u32)0;
|
||
|
int fail = 0;
|
||
|
struct btrfs_root *root = sdev->dev->dev_root;
|
||
|
|
||
|
if (!spag->have_csum)
|
||
|
return 0;
|
||
|
|
||
|
crc = btrfs_csum_data(root, buffer, crc, PAGE_SIZE);
|
||
|
btrfs_csum_final(crc, csum);
|
||
|
if (memcmp(csum, spag->csum, sdev->csum_size))
|
||
|
fail = 1;
|
||
|
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
++sdev->stat.data_extents_scrubbed;
|
||
|
sdev->stat.data_bytes_scrubbed += PAGE_SIZE;
|
||
|
if (fail)
|
||
|
++sdev->stat.csum_errors;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
|
||
|
return fail;
|
||
|
}
|
||
|
|
||
|
static int scrub_checksum_tree_block(struct scrub_dev *sdev,
|
||
|
struct scrub_page *spag, u64 logical,
|
||
|
void *buffer)
|
||
|
{
|
||
|
struct btrfs_header *h;
|
||
|
struct btrfs_root *root = sdev->dev->dev_root;
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
u8 csum[BTRFS_CSUM_SIZE];
|
||
|
u32 crc = ~(u32)0;
|
||
|
int fail = 0;
|
||
|
int crc_fail = 0;
|
||
|
|
||
|
/*
|
||
|
* we don't use the getter functions here, as we
|
||
|
* a) don't have an extent buffer and
|
||
|
* b) the page is already kmapped
|
||
|
*/
|
||
|
h = (struct btrfs_header *)buffer;
|
||
|
|
||
|
if (logical != le64_to_cpu(h->bytenr))
|
||
|
++fail;
|
||
|
|
||
|
if (spag->generation != le64_to_cpu(h->generation))
|
||
|
++fail;
|
||
|
|
||
|
if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
|
||
|
++fail;
|
||
|
|
||
|
if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
|
||
|
BTRFS_UUID_SIZE))
|
||
|
++fail;
|
||
|
|
||
|
crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc,
|
||
|
PAGE_SIZE - BTRFS_CSUM_SIZE);
|
||
|
btrfs_csum_final(crc, csum);
|
||
|
if (memcmp(csum, h->csum, sdev->csum_size))
|
||
|
++crc_fail;
|
||
|
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
++sdev->stat.tree_extents_scrubbed;
|
||
|
sdev->stat.tree_bytes_scrubbed += PAGE_SIZE;
|
||
|
if (crc_fail)
|
||
|
++sdev->stat.csum_errors;
|
||
|
if (fail)
|
||
|
++sdev->stat.verify_errors;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
|
||
|
return fail || crc_fail;
|
||
|
}
|
||
|
|
||
|
static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer)
|
||
|
{
|
||
|
struct btrfs_super_block *s;
|
||
|
u64 logical;
|
||
|
struct scrub_dev *sdev = sbio->sdev;
|
||
|
struct btrfs_root *root = sdev->dev->dev_root;
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
u8 csum[BTRFS_CSUM_SIZE];
|
||
|
u32 crc = ~(u32)0;
|
||
|
int fail = 0;
|
||
|
|
||
|
s = (struct btrfs_super_block *)buffer;
|
||
|
logical = sbio->logical;
|
||
|
|
||
|
if (logical != le64_to_cpu(s->bytenr))
|
||
|
++fail;
|
||
|
|
||
|
if (sbio->spag[0].generation != le64_to_cpu(s->generation))
|
||
|
++fail;
|
||
|
|
||
|
if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
|
||
|
++fail;
|
||
|
|
||
|
crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc,
|
||
|
PAGE_SIZE - BTRFS_CSUM_SIZE);
|
||
|
btrfs_csum_final(crc, csum);
|
||
|
if (memcmp(csum, s->csum, sbio->sdev->csum_size))
|
||
|
++fail;
|
||
|
|
||
|
if (fail) {
|
||
|
/*
|
||
|
* if we find an error in a super block, we just report it.
|
||
|
* They will get written with the next transaction commit
|
||
|
* anyway
|
||
|
*/
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
++sdev->stat.super_errors;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
}
|
||
|
|
||
|
return fail;
|
||
|
}
|
||
|
|
||
|
static int scrub_submit(struct scrub_dev *sdev)
|
||
|
{
|
||
|
struct scrub_bio *sbio;
|
||
|
|
||
|
if (sdev->curr == -1)
|
||
|
return 0;
|
||
|
|
||
|
sbio = sdev->bios[sdev->curr];
|
||
|
|
||
|
sbio->bio->bi_sector = sbio->physical >> 9;
|
||
|
sbio->bio->bi_size = sbio->count * PAGE_SIZE;
|
||
|
sbio->bio->bi_next = NULL;
|
||
|
sbio->bio->bi_flags |= 1 << BIO_UPTODATE;
|
||
|
sbio->bio->bi_comp_cpu = -1;
|
||
|
sbio->bio->bi_bdev = sdev->dev->bdev;
|
||
|
sbio->err = 0;
|
||
|
sdev->curr = -1;
|
||
|
atomic_inc(&sdev->in_flight);
|
||
|
|
||
|
submit_bio(0, sbio->bio);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int scrub_page(struct scrub_dev *sdev, u64 logical, u64 len,
|
||
|
u64 physical, u64 flags, u64 gen, u64 mirror_num,
|
||
|
u8 *csum, int force)
|
||
|
{
|
||
|
struct scrub_bio *sbio;
|
||
|
|
||
|
again:
|
||
|
/*
|
||
|
* grab a fresh bio or wait for one to become available
|
||
|
*/
|
||
|
while (sdev->curr == -1) {
|
||
|
spin_lock(&sdev->list_lock);
|
||
|
sdev->curr = sdev->first_free;
|
||
|
if (sdev->curr != -1) {
|
||
|
sdev->first_free = sdev->bios[sdev->curr]->next_free;
|
||
|
sdev->bios[sdev->curr]->next_free = -1;
|
||
|
sdev->bios[sdev->curr]->count = 0;
|
||
|
spin_unlock(&sdev->list_lock);
|
||
|
} else {
|
||
|
spin_unlock(&sdev->list_lock);
|
||
|
wait_event(sdev->list_wait, sdev->first_free != -1);
|
||
|
}
|
||
|
}
|
||
|
sbio = sdev->bios[sdev->curr];
|
||
|
if (sbio->count == 0) {
|
||
|
sbio->physical = physical;
|
||
|
sbio->logical = logical;
|
||
|
} else if (sbio->physical + sbio->count * PAGE_SIZE != physical) {
|
||
|
scrub_submit(sdev);
|
||
|
goto again;
|
||
|
}
|
||
|
sbio->spag[sbio->count].flags = flags;
|
||
|
sbio->spag[sbio->count].generation = gen;
|
||
|
sbio->spag[sbio->count].have_csum = 0;
|
||
|
sbio->spag[sbio->count].mirror_num = mirror_num;
|
||
|
if (csum) {
|
||
|
sbio->spag[sbio->count].have_csum = 1;
|
||
|
memcpy(sbio->spag[sbio->count].csum, csum, sdev->csum_size);
|
||
|
}
|
||
|
++sbio->count;
|
||
|
if (sbio->count == SCRUB_PAGES_PER_BIO || force)
|
||
|
scrub_submit(sdev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len,
|
||
|
u8 *csum)
|
||
|
{
|
||
|
struct btrfs_ordered_sum *sum = NULL;
|
||
|
int ret = 0;
|
||
|
unsigned long i;
|
||
|
unsigned long num_sectors;
|
||
|
u32 sectorsize = sdev->dev->dev_root->sectorsize;
|
||
|
|
||
|
while (!list_empty(&sdev->csum_list)) {
|
||
|
sum = list_first_entry(&sdev->csum_list,
|
||
|
struct btrfs_ordered_sum, list);
|
||
|
if (sum->bytenr > logical)
|
||
|
return 0;
|
||
|
if (sum->bytenr + sum->len > logical)
|
||
|
break;
|
||
|
|
||
|
++sdev->stat.csum_discards;
|
||
|
list_del(&sum->list);
|
||
|
kfree(sum);
|
||
|
sum = NULL;
|
||
|
}
|
||
|
if (!sum)
|
||
|
return 0;
|
||
|
|
||
|
num_sectors = sum->len / sectorsize;
|
||
|
for (i = 0; i < num_sectors; ++i) {
|
||
|
if (sum->sums[i].bytenr == logical) {
|
||
|
memcpy(csum, &sum->sums[i].sum, sdev->csum_size);
|
||
|
ret = 1;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (ret && i == num_sectors - 1) {
|
||
|
list_del(&sum->list);
|
||
|
kfree(sum);
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* scrub extent tries to collect up to 64 kB for each bio */
|
||
|
static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len,
|
||
|
u64 physical, u64 flags, u64 gen, u64 mirror_num)
|
||
|
{
|
||
|
int ret;
|
||
|
u8 csum[BTRFS_CSUM_SIZE];
|
||
|
|
||
|
while (len) {
|
||
|
u64 l = min_t(u64, len, PAGE_SIZE);
|
||
|
int have_csum = 0;
|
||
|
|
||
|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
||
|
/* push csums to sbio */
|
||
|
have_csum = scrub_find_csum(sdev, logical, l, csum);
|
||
|
if (have_csum == 0)
|
||
|
++sdev->stat.no_csum;
|
||
|
}
|
||
|
ret = scrub_page(sdev, logical, l, physical, flags, gen,
|
||
|
mirror_num, have_csum ? csum : NULL, 0);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
len -= l;
|
||
|
logical += l;
|
||
|
physical += l;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev,
|
||
|
struct map_lookup *map, int num, u64 base, u64 length)
|
||
|
{
|
||
|
struct btrfs_path *path;
|
||
|
struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
|
||
|
struct btrfs_root *root = fs_info->extent_root;
|
||
|
struct btrfs_root *csum_root = fs_info->csum_root;
|
||
|
struct btrfs_extent_item *extent;
|
||
|
u64 flags;
|
||
|
int ret;
|
||
|
int slot;
|
||
|
int i;
|
||
|
u64 nstripes;
|
||
|
int start_stripe;
|
||
|
struct extent_buffer *l;
|
||
|
struct btrfs_key key;
|
||
|
u64 physical;
|
||
|
u64 logical;
|
||
|
u64 generation;
|
||
|
u64 mirror_num;
|
||
|
|
||
|
u64 increment = map->stripe_len;
|
||
|
u64 offset;
|
||
|
|
||
|
nstripes = length;
|
||
|
offset = 0;
|
||
|
do_div(nstripes, map->stripe_len);
|
||
|
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
|
||
|
offset = map->stripe_len * num;
|
||
|
increment = map->stripe_len * map->num_stripes;
|
||
|
mirror_num = 0;
|
||
|
} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
|
||
|
int factor = map->num_stripes / map->sub_stripes;
|
||
|
offset = map->stripe_len * (num / map->sub_stripes);
|
||
|
increment = map->stripe_len * factor;
|
||
|
mirror_num = num % map->sub_stripes;
|
||
|
} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
|
||
|
increment = map->stripe_len;
|
||
|
mirror_num = num % map->num_stripes;
|
||
|
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
|
||
|
increment = map->stripe_len;
|
||
|
mirror_num = num % map->num_stripes;
|
||
|
} else {
|
||
|
increment = map->stripe_len;
|
||
|
mirror_num = 0;
|
||
|
}
|
||
|
|
||
|
path = btrfs_alloc_path();
|
||
|
if (!path)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
path->reada = 2;
|
||
|
path->search_commit_root = 1;
|
||
|
path->skip_locking = 1;
|
||
|
|
||
|
/*
|
||
|
* find all extents for each stripe and just read them to get
|
||
|
* them into the page cache
|
||
|
* FIXME: we can do better. build a more intelligent prefetching
|
||
|
*/
|
||
|
logical = base + offset;
|
||
|
physical = map->stripes[num].physical;
|
||
|
ret = 0;
|
||
|
for (i = 0; i < nstripes; ++i) {
|
||
|
key.objectid = logical;
|
||
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
||
|
key.offset = (u64)0;
|
||
|
|
||
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
l = path->nodes[0];
|
||
|
slot = path->slots[0];
|
||
|
btrfs_item_key_to_cpu(l, &key, slot);
|
||
|
if (key.objectid != logical) {
|
||
|
ret = btrfs_previous_item(root, path, 0,
|
||
|
BTRFS_EXTENT_ITEM_KEY);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
while (1) {
|
||
|
l = path->nodes[0];
|
||
|
slot = path->slots[0];
|
||
|
if (slot >= btrfs_header_nritems(l)) {
|
||
|
ret = btrfs_next_leaf(root, path);
|
||
|
if (ret == 0)
|
||
|
continue;
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
break;
|
||
|
}
|
||
|
btrfs_item_key_to_cpu(l, &key, slot);
|
||
|
|
||
|
if (key.objectid >= logical + map->stripe_len)
|
||
|
break;
|
||
|
|
||
|
path->slots[0]++;
|
||
|
}
|
||
|
btrfs_release_path(root, path);
|
||
|
logical += increment;
|
||
|
physical += map->stripe_len;
|
||
|
cond_resched();
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* collect all data csums for the stripe to avoid seeking during
|
||
|
* the scrub. This might currently (crc32) end up to be about 1MB
|
||
|
*/
|
||
|
start_stripe = 0;
|
||
|
again:
|
||
|
logical = base + offset + start_stripe * increment;
|
||
|
for (i = start_stripe; i < nstripes; ++i) {
|
||
|
ret = btrfs_lookup_csums_range(csum_root, logical,
|
||
|
logical + map->stripe_len - 1,
|
||
|
&sdev->csum_list, 1);
|
||
|
if (ret)
|
||
|
goto out;
|
||
|
|
||
|
logical += increment;
|
||
|
cond_resched();
|
||
|
}
|
||
|
/*
|
||
|
* now find all extents for each stripe and scrub them
|
||
|
*/
|
||
|
logical = base + offset + start_stripe * increment;
|
||
|
physical = map->stripes[num].physical + start_stripe * map->stripe_len;
|
||
|
ret = 0;
|
||
|
for (i = start_stripe; i < nstripes; ++i) {
|
||
|
/*
|
||
|
* canceled?
|
||
|
*/
|
||
|
if (atomic_read(&fs_info->scrub_cancel_req) ||
|
||
|
atomic_read(&sdev->cancel_req)) {
|
||
|
ret = -ECANCELED;
|
||
|
goto out;
|
||
|
}
|
||
|
/*
|
||
|
* check to see if we have to pause
|
||
|
*/
|
||
|
if (atomic_read(&fs_info->scrub_pause_req)) {
|
||
|
/* push queued extents */
|
||
|
scrub_submit(sdev);
|
||
|
wait_event(sdev->list_wait,
|
||
|
atomic_read(&sdev->in_flight) == 0);
|
||
|
atomic_inc(&fs_info->scrubs_paused);
|
||
|
wake_up(&fs_info->scrub_pause_wait);
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
while (atomic_read(&fs_info->scrub_pause_req)) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
wait_event(fs_info->scrub_pause_wait,
|
||
|
atomic_read(&fs_info->scrub_pause_req) == 0);
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
}
|
||
|
atomic_dec(&fs_info->scrubs_paused);
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
wake_up(&fs_info->scrub_pause_wait);
|
||
|
scrub_free_csums(sdev);
|
||
|
start_stripe = i;
|
||
|
goto again;
|
||
|
}
|
||
|
|
||
|
key.objectid = logical;
|
||
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
||
|
key.offset = (u64)0;
|
||
|
|
||
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
l = path->nodes[0];
|
||
|
slot = path->slots[0];
|
||
|
btrfs_item_key_to_cpu(l, &key, slot);
|
||
|
if (key.objectid != logical) {
|
||
|
ret = btrfs_previous_item(root, path, 0,
|
||
|
BTRFS_EXTENT_ITEM_KEY);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
while (1) {
|
||
|
l = path->nodes[0];
|
||
|
slot = path->slots[0];
|
||
|
if (slot >= btrfs_header_nritems(l)) {
|
||
|
ret = btrfs_next_leaf(root, path);
|
||
|
if (ret == 0)
|
||
|
continue;
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
break;
|
||
|
}
|
||
|
btrfs_item_key_to_cpu(l, &key, slot);
|
||
|
|
||
|
if (key.objectid + key.offset <= logical)
|
||
|
goto next;
|
||
|
|
||
|
if (key.objectid >= logical + map->stripe_len)
|
||
|
break;
|
||
|
|
||
|
if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY)
|
||
|
goto next;
|
||
|
|
||
|
extent = btrfs_item_ptr(l, slot,
|
||
|
struct btrfs_extent_item);
|
||
|
flags = btrfs_extent_flags(l, extent);
|
||
|
generation = btrfs_extent_generation(l, extent);
|
||
|
|
||
|
if (key.objectid < logical &&
|
||
|
(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
|
||
|
printk(KERN_ERR
|
||
|
"btrfs scrub: tree block %llu spanning "
|
||
|
"stripes, ignored. logical=%llu\n",
|
||
|
(unsigned long long)key.objectid,
|
||
|
(unsigned long long)logical);
|
||
|
goto next;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* trim extent to this stripe
|
||
|
*/
|
||
|
if (key.objectid < logical) {
|
||
|
key.offset -= logical - key.objectid;
|
||
|
key.objectid = logical;
|
||
|
}
|
||
|
if (key.objectid + key.offset >
|
||
|
logical + map->stripe_len) {
|
||
|
key.offset = logical + map->stripe_len -
|
||
|
key.objectid;
|
||
|
}
|
||
|
|
||
|
ret = scrub_extent(sdev, key.objectid, key.offset,
|
||
|
key.objectid - logical + physical,
|
||
|
flags, generation, mirror_num);
|
||
|
if (ret)
|
||
|
goto out;
|
||
|
|
||
|
next:
|
||
|
path->slots[0]++;
|
||
|
}
|
||
|
btrfs_release_path(root, path);
|
||
|
logical += increment;
|
||
|
physical += map->stripe_len;
|
||
|
spin_lock(&sdev->stat_lock);
|
||
|
sdev->stat.last_physical = physical;
|
||
|
spin_unlock(&sdev->stat_lock);
|
||
|
}
|
||
|
/* push queued extents */
|
||
|
scrub_submit(sdev);
|
||
|
|
||
|
out:
|
||
|
btrfs_free_path(path);
|
||
|
return ret < 0 ? ret : 0;
|
||
|
}
|
||
|
|
||
|
static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev,
|
||
|
u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length)
|
||
|
{
|
||
|
struct btrfs_mapping_tree *map_tree =
|
||
|
&sdev->dev->dev_root->fs_info->mapping_tree;
|
||
|
struct map_lookup *map;
|
||
|
struct extent_map *em;
|
||
|
int i;
|
||
|
int ret = -EINVAL;
|
||
|
|
||
|
read_lock(&map_tree->map_tree.lock);
|
||
|
em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
|
||
|
read_unlock(&map_tree->map_tree.lock);
|
||
|
|
||
|
if (!em)
|
||
|
return -EINVAL;
|
||
|
|
||
|
map = (struct map_lookup *)em->bdev;
|
||
|
if (em->start != chunk_offset)
|
||
|
goto out;
|
||
|
|
||
|
if (em->len < length)
|
||
|
goto out;
|
||
|
|
||
|
for (i = 0; i < map->num_stripes; ++i) {
|
||
|
if (map->stripes[i].dev == sdev->dev) {
|
||
|
ret = scrub_stripe(sdev, map, i, chunk_offset, length);
|
||
|
if (ret)
|
||
|
goto out;
|
||
|
}
|
||
|
}
|
||
|
out:
|
||
|
free_extent_map(em);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static noinline_for_stack
|
||
|
int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
|
||
|
{
|
||
|
struct btrfs_dev_extent *dev_extent = NULL;
|
||
|
struct btrfs_path *path;
|
||
|
struct btrfs_root *root = sdev->dev->dev_root;
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
u64 length;
|
||
|
u64 chunk_tree;
|
||
|
u64 chunk_objectid;
|
||
|
u64 chunk_offset;
|
||
|
int ret;
|
||
|
int slot;
|
||
|
struct extent_buffer *l;
|
||
|
struct btrfs_key key;
|
||
|
struct btrfs_key found_key;
|
||
|
struct btrfs_block_group_cache *cache;
|
||
|
|
||
|
path = btrfs_alloc_path();
|
||
|
if (!path)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
path->reada = 2;
|
||
|
path->search_commit_root = 1;
|
||
|
path->skip_locking = 1;
|
||
|
|
||
|
key.objectid = sdev->dev->devid;
|
||
|
key.offset = 0ull;
|
||
|
key.type = BTRFS_DEV_EXTENT_KEY;
|
||
|
|
||
|
|
||
|
while (1) {
|
||
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
ret = 0;
|
||
|
|
||
|
l = path->nodes[0];
|
||
|
slot = path->slots[0];
|
||
|
|
||
|
btrfs_item_key_to_cpu(l, &found_key, slot);
|
||
|
|
||
|
if (found_key.objectid != sdev->dev->devid)
|
||
|
break;
|
||
|
|
||
|
if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY)
|
||
|
break;
|
||
|
|
||
|
if (found_key.offset >= end)
|
||
|
break;
|
||
|
|
||
|
if (found_key.offset < key.offset)
|
||
|
break;
|
||
|
|
||
|
dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
|
||
|
length = btrfs_dev_extent_length(l, dev_extent);
|
||
|
|
||
|
if (found_key.offset + length <= start) {
|
||
|
key.offset = found_key.offset + length;
|
||
|
btrfs_release_path(root, path);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
|
||
|
chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
|
||
|
chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
|
||
|
|
||
|
/*
|
||
|
* get a reference on the corresponding block group to prevent
|
||
|
* the chunk from going away while we scrub it
|
||
|
*/
|
||
|
cache = btrfs_lookup_block_group(fs_info, chunk_offset);
|
||
|
if (!cache) {
|
||
|
ret = -ENOENT;
|
||
|
goto out;
|
||
|
}
|
||
|
ret = scrub_chunk(sdev, chunk_tree, chunk_objectid,
|
||
|
chunk_offset, length);
|
||
|
btrfs_put_block_group(cache);
|
||
|
if (ret)
|
||
|
break;
|
||
|
|
||
|
key.offset = found_key.offset + length;
|
||
|
btrfs_release_path(root, path);
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
btrfs_free_path(path);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static noinline_for_stack int scrub_supers(struct scrub_dev *sdev)
|
||
|
{
|
||
|
int i;
|
||
|
u64 bytenr;
|
||
|
u64 gen;
|
||
|
int ret;
|
||
|
struct btrfs_device *device = sdev->dev;
|
||
|
struct btrfs_root *root = device->dev_root;
|
||
|
|
||
|
gen = root->fs_info->last_trans_committed;
|
||
|
|
||
|
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
||
|
bytenr = btrfs_sb_offset(i);
|
||
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
|
||
|
break;
|
||
|
|
||
|
ret = scrub_page(sdev, bytenr, PAGE_SIZE, bytenr,
|
||
|
BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
}
|
||
|
wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* get a reference count on fs_info->scrub_workers. start worker if necessary
|
||
|
*/
|
||
|
static noinline_for_stack int scrub_workers_get(struct btrfs_root *root)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
if (fs_info->scrub_workers_refcnt == 0)
|
||
|
btrfs_start_workers(&fs_info->scrub_workers, 1);
|
||
|
++fs_info->scrub_workers_refcnt;
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static noinline_for_stack void scrub_workers_put(struct btrfs_root *root)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
if (--fs_info->scrub_workers_refcnt == 0)
|
||
|
btrfs_stop_workers(&fs_info->scrub_workers);
|
||
|
WARN_ON(fs_info->scrub_workers_refcnt < 0);
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
}
|
||
|
|
||
|
|
||
|
int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
|
||
|
struct btrfs_scrub_progress *progress)
|
||
|
{
|
||
|
struct scrub_dev *sdev;
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
int ret;
|
||
|
struct btrfs_device *dev;
|
||
|
|
||
|
if (root->fs_info->closing)
|
||
|
return -EINVAL;
|
||
|
|
||
|
/*
|
||
|
* check some assumptions
|
||
|
*/
|
||
|
if (root->sectorsize != PAGE_SIZE ||
|
||
|
root->sectorsize != root->leafsize ||
|
||
|
root->sectorsize != root->nodesize) {
|
||
|
printk(KERN_ERR "btrfs_scrub: size assumptions fail\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ret = scrub_workers_get(root);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
dev = btrfs_find_device(root, devid, NULL, NULL);
|
||
|
if (!dev || dev->missing) {
|
||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
scrub_workers_put(root);
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
|
||
|
if (!dev->in_fs_metadata) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
scrub_workers_put(root);
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
|
||
|
if (dev->scrub_device) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
scrub_workers_put(root);
|
||
|
return -EINPROGRESS;
|
||
|
}
|
||
|
sdev = scrub_setup_dev(dev);
|
||
|
if (IS_ERR(sdev)) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
scrub_workers_put(root);
|
||
|
return PTR_ERR(sdev);
|
||
|
}
|
||
|
dev->scrub_device = sdev;
|
||
|
|
||
|
atomic_inc(&fs_info->scrubs_running);
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
|
||
|
down_read(&fs_info->scrub_super_lock);
|
||
|
ret = scrub_supers(sdev);
|
||
|
up_read(&fs_info->scrub_super_lock);
|
||
|
|
||
|
if (!ret)
|
||
|
ret = scrub_enumerate_chunks(sdev, start, end);
|
||
|
|
||
|
wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0);
|
||
|
|
||
|
atomic_dec(&fs_info->scrubs_running);
|
||
|
wake_up(&fs_info->scrub_pause_wait);
|
||
|
|
||
|
if (progress)
|
||
|
memcpy(progress, &sdev->stat, sizeof(*progress));
|
||
|
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
dev->scrub_device = NULL;
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
|
||
|
scrub_free_dev(sdev);
|
||
|
scrub_workers_put(root);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_pause(struct btrfs_root *root)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
atomic_inc(&fs_info->scrub_pause_req);
|
||
|
while (atomic_read(&fs_info->scrubs_paused) !=
|
||
|
atomic_read(&fs_info->scrubs_running)) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
wait_event(fs_info->scrub_pause_wait,
|
||
|
atomic_read(&fs_info->scrubs_paused) ==
|
||
|
atomic_read(&fs_info->scrubs_running));
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
}
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_continue(struct btrfs_root *root)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
|
||
|
atomic_dec(&fs_info->scrub_pause_req);
|
||
|
wake_up(&fs_info->scrub_pause_wait);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_pause_super(struct btrfs_root *root)
|
||
|
{
|
||
|
down_write(&root->fs_info->scrub_super_lock);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_continue_super(struct btrfs_root *root)
|
||
|
{
|
||
|
up_write(&root->fs_info->scrub_super_lock);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_cancel(struct btrfs_root *root)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
if (!atomic_read(&fs_info->scrubs_running)) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
return -ENOTCONN;
|
||
|
}
|
||
|
|
||
|
atomic_inc(&fs_info->scrub_cancel_req);
|
||
|
while (atomic_read(&fs_info->scrubs_running)) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
wait_event(fs_info->scrub_pause_wait,
|
||
|
atomic_read(&fs_info->scrubs_running) == 0);
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
}
|
||
|
atomic_dec(&fs_info->scrub_cancel_req);
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
struct scrub_dev *sdev;
|
||
|
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
sdev = dev->scrub_device;
|
||
|
if (!sdev) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
return -ENOTCONN;
|
||
|
}
|
||
|
atomic_inc(&sdev->cancel_req);
|
||
|
while (dev->scrub_device) {
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
wait_event(fs_info->scrub_pause_wait,
|
||
|
dev->scrub_device == NULL);
|
||
|
mutex_lock(&fs_info->scrub_lock);
|
||
|
}
|
||
|
mutex_unlock(&fs_info->scrub_lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid)
|
||
|
{
|
||
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
struct btrfs_device *dev;
|
||
|
int ret;
|
||
|
|
||
|
/*
|
||
|
* we have to hold the device_list_mutex here so the device
|
||
|
* does not go away in cancel_dev. FIXME: find a better solution
|
||
|
*/
|
||
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
||
|
dev = btrfs_find_device(root, devid, NULL, NULL);
|
||
|
if (!dev) {
|
||
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
ret = btrfs_scrub_cancel_dev(root, dev);
|
||
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
|
||
|
struct btrfs_scrub_progress *progress)
|
||
|
{
|
||
|
struct btrfs_device *dev;
|
||
|
struct scrub_dev *sdev = NULL;
|
||
|
|
||
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
dev = btrfs_find_device(root, devid, NULL, NULL);
|
||
|
if (dev)
|
||
|
sdev = dev->scrub_device;
|
||
|
if (sdev)
|
||
|
memcpy(progress, &sdev->stat, sizeof(*progress));
|
||
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
||
|
|
||
|
return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV;
|
||
|
}
|