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![David Sterba](/assets/img/avatar_default.png)
We can read fs_info from the device and can drop it from the parameters. Signed-off-by: David Sterba <dsterba@suse.com>
4065 lines
107 KiB
C
4065 lines
107 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011, 2012 STRATO. All rights reserved.
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*/
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#include <linux/blkdev.h>
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#include <linux/ratelimit.h>
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#include <linux/sched/mm.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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#include "transaction.h"
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#include "backref.h"
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#include "extent_io.h"
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#include "dev-replace.h"
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#include "check-integrity.h"
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#include "rcu-string.h"
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#include "raid56.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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* - In case an unrepairable extent is encountered, track which files are
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* affected and report them
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* - track and record media errors, throw out bad devices
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* - add a mode to also read unallocated space
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*/
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struct scrub_block;
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struct scrub_ctx;
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/*
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* the following three values only influence the performance.
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* The last one configures the number of parallel and outstanding I/O
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* operations. The first two values configure an upper limit for the number
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* of (dynamically allocated) pages that are added to a bio.
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*/
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#define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */
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#define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */
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#define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */
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/*
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* the following value times PAGE_SIZE needs to be large enough to match the
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* largest node/leaf/sector size that shall be supported.
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* Values larger than BTRFS_STRIPE_LEN are not supported.
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*/
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#define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */
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struct scrub_recover {
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refcount_t refs;
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struct btrfs_bio *bbio;
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u64 map_length;
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};
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struct scrub_page {
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struct scrub_block *sblock;
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struct page *page;
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struct btrfs_device *dev;
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struct list_head list;
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u64 flags; /* extent flags */
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u64 generation;
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u64 logical;
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u64 physical;
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u64 physical_for_dev_replace;
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atomic_t refs;
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struct {
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unsigned int mirror_num:8;
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unsigned int have_csum:1;
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unsigned int io_error:1;
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};
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u8 csum[BTRFS_CSUM_SIZE];
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struct scrub_recover *recover;
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};
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struct scrub_bio {
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int index;
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struct scrub_ctx *sctx;
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struct btrfs_device *dev;
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struct bio *bio;
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blk_status_t status;
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u64 logical;
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u64 physical;
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#if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
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struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
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#else
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struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
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#endif
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int page_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_block {
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struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
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int page_count;
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atomic_t outstanding_pages;
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refcount_t refs; /* free mem on transition to zero */
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struct scrub_ctx *sctx;
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struct scrub_parity *sparity;
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struct {
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unsigned int header_error:1;
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unsigned int checksum_error:1;
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unsigned int no_io_error_seen:1;
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unsigned int generation_error:1; /* also sets header_error */
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/* The following is for the data used to check parity */
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/* It is for the data with checksum */
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unsigned int data_corrected:1;
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};
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struct btrfs_work work;
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};
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/* Used for the chunks with parity stripe such RAID5/6 */
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struct scrub_parity {
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struct scrub_ctx *sctx;
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struct btrfs_device *scrub_dev;
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u64 logic_start;
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u64 logic_end;
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int nsectors;
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u64 stripe_len;
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refcount_t refs;
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struct list_head spages;
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/* Work of parity check and repair */
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struct btrfs_work work;
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/* Mark the parity blocks which have data */
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unsigned long *dbitmap;
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/*
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* Mark the parity blocks which have data, but errors happen when
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* read data or check data
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*/
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unsigned long *ebitmap;
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unsigned long bitmap[0];
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};
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struct scrub_ctx {
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struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
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struct btrfs_fs_info *fs_info;
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int first_free;
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int curr;
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atomic_t bios_in_flight;
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atomic_t workers_pending;
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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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int readonly;
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int pages_per_rd_bio;
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int is_dev_replace;
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struct scrub_bio *wr_curr_bio;
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struct mutex wr_lock;
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int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
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struct btrfs_device *wr_tgtdev;
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bool flush_all_writes;
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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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* Use a ref counter to avoid use-after-free issues. Scrub workers
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* decrement bios_in_flight and workers_pending and then do a wakeup
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* on the list_wait wait queue. We must ensure the main scrub task
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* doesn't free the scrub context before or while the workers are
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* doing the wakeup() call.
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*/
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refcount_t refs;
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};
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struct scrub_warning {
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struct btrfs_path *path;
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u64 extent_item_size;
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const char *errstr;
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u64 physical;
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u64 logical;
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struct btrfs_device *dev;
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};
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struct full_stripe_lock {
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struct rb_node node;
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u64 logical;
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u64 refs;
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struct mutex mutex;
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};
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static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
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static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
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static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
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static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
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struct scrub_block *sblocks_for_recheck);
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static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
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struct scrub_block *sblock,
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int retry_failed_mirror);
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static void scrub_recheck_block_checksum(struct scrub_block *sblock);
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static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
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struct scrub_block *sblock_good);
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static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
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struct scrub_block *sblock_good,
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int page_num, int force_write);
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static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
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static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
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int page_num);
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static int scrub_checksum_data(struct scrub_block *sblock);
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static int scrub_checksum_tree_block(struct scrub_block *sblock);
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static int scrub_checksum_super(struct scrub_block *sblock);
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static void scrub_block_get(struct scrub_block *sblock);
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static void scrub_block_put(struct scrub_block *sblock);
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static void scrub_page_get(struct scrub_page *spage);
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static void scrub_page_put(struct scrub_page *spage);
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static void scrub_parity_get(struct scrub_parity *sparity);
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static void scrub_parity_put(struct scrub_parity *sparity);
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static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
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struct scrub_page *spage);
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static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
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u64 physical, struct btrfs_device *dev, u64 flags,
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u64 gen, int mirror_num, u8 *csum, int force,
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u64 physical_for_dev_replace);
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static void scrub_bio_end_io(struct bio *bio);
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static void scrub_bio_end_io_worker(struct btrfs_work *work);
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static void scrub_block_complete(struct scrub_block *sblock);
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static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
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u64 extent_logical, u64 extent_len,
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u64 *extent_physical,
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struct btrfs_device **extent_dev,
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int *extent_mirror_num);
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static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
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struct scrub_page *spage);
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static void scrub_wr_submit(struct scrub_ctx *sctx);
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static void scrub_wr_bio_end_io(struct bio *bio);
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static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
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static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
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static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
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static void scrub_put_ctx(struct scrub_ctx *sctx);
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static inline int scrub_is_page_on_raid56(struct scrub_page *page)
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{
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return page->recover &&
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(page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK);
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}
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static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
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{
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refcount_inc(&sctx->refs);
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atomic_inc(&sctx->bios_in_flight);
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}
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static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
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{
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atomic_dec(&sctx->bios_in_flight);
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wake_up(&sctx->list_wait);
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scrub_put_ctx(sctx);
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}
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static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
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{
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while (atomic_read(&fs_info->scrub_pause_req)) {
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mutex_unlock(&fs_info->scrub_lock);
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wait_event(fs_info->scrub_pause_wait,
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atomic_read(&fs_info->scrub_pause_req) == 0);
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mutex_lock(&fs_info->scrub_lock);
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}
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}
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static void scrub_pause_on(struct btrfs_fs_info *fs_info)
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{
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atomic_inc(&fs_info->scrubs_paused);
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wake_up(&fs_info->scrub_pause_wait);
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}
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static void scrub_pause_off(struct btrfs_fs_info *fs_info)
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{
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mutex_lock(&fs_info->scrub_lock);
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__scrub_blocked_if_needed(fs_info);
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atomic_dec(&fs_info->scrubs_paused);
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mutex_unlock(&fs_info->scrub_lock);
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wake_up(&fs_info->scrub_pause_wait);
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}
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static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
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{
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scrub_pause_on(fs_info);
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scrub_pause_off(fs_info);
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}
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/*
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* Insert new full stripe lock into full stripe locks tree
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*
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* Return pointer to existing or newly inserted full_stripe_lock structure if
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* everything works well.
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* Return ERR_PTR(-ENOMEM) if we failed to allocate memory
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*
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* NOTE: caller must hold full_stripe_locks_root->lock before calling this
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* function
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*/
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static struct full_stripe_lock *insert_full_stripe_lock(
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struct btrfs_full_stripe_locks_tree *locks_root,
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u64 fstripe_logical)
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{
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struct rb_node **p;
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struct rb_node *parent = NULL;
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struct full_stripe_lock *entry;
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struct full_stripe_lock *ret;
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lockdep_assert_held(&locks_root->lock);
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p = &locks_root->root.rb_node;
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while (*p) {
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parent = *p;
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entry = rb_entry(parent, struct full_stripe_lock, node);
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if (fstripe_logical < entry->logical) {
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p = &(*p)->rb_left;
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} else if (fstripe_logical > entry->logical) {
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p = &(*p)->rb_right;
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} else {
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entry->refs++;
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return entry;
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}
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}
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/*
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* Insert new lock.
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*/
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ret = kmalloc(sizeof(*ret), GFP_KERNEL);
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if (!ret)
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return ERR_PTR(-ENOMEM);
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ret->logical = fstripe_logical;
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ret->refs = 1;
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mutex_init(&ret->mutex);
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rb_link_node(&ret->node, parent, p);
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rb_insert_color(&ret->node, &locks_root->root);
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return ret;
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}
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/*
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* Search for a full stripe lock of a block group
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*
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* Return pointer to existing full stripe lock if found
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* Return NULL if not found
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*/
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static struct full_stripe_lock *search_full_stripe_lock(
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struct btrfs_full_stripe_locks_tree *locks_root,
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u64 fstripe_logical)
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{
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struct rb_node *node;
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struct full_stripe_lock *entry;
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lockdep_assert_held(&locks_root->lock);
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node = locks_root->root.rb_node;
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while (node) {
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entry = rb_entry(node, struct full_stripe_lock, node);
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if (fstripe_logical < entry->logical)
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node = node->rb_left;
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else if (fstripe_logical > entry->logical)
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node = node->rb_right;
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else
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return entry;
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}
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return NULL;
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}
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/*
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* Helper to get full stripe logical from a normal bytenr.
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*
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* Caller must ensure @cache is a RAID56 block group.
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*/
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static u64 get_full_stripe_logical(struct btrfs_block_group_cache *cache,
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u64 bytenr)
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{
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u64 ret;
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/*
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* Due to chunk item size limit, full stripe length should not be
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* larger than U32_MAX. Just a sanity check here.
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*/
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WARN_ON_ONCE(cache->full_stripe_len >= U32_MAX);
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/*
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* round_down() can only handle power of 2, while RAID56 full
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* stripe length can be 64KiB * n, so we need to manually round down.
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*/
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ret = div64_u64(bytenr - cache->key.objectid, cache->full_stripe_len) *
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cache->full_stripe_len + cache->key.objectid;
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return ret;
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}
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/*
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* Lock a full stripe to avoid concurrency of recovery and read
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*
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* It's only used for profiles with parities (RAID5/6), for other profiles it
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* does nothing.
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*
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* Return 0 if we locked full stripe covering @bytenr, with a mutex held.
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* So caller must call unlock_full_stripe() at the same context.
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*
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* Return <0 if encounters error.
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*/
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static int lock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr,
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bool *locked_ret)
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{
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struct btrfs_block_group_cache *bg_cache;
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struct btrfs_full_stripe_locks_tree *locks_root;
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struct full_stripe_lock *existing;
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u64 fstripe_start;
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int ret = 0;
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*locked_ret = false;
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bg_cache = btrfs_lookup_block_group(fs_info, bytenr);
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if (!bg_cache) {
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ASSERT(0);
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return -ENOENT;
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}
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/* Profiles not based on parity don't need full stripe lock */
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if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK))
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goto out;
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locks_root = &bg_cache->full_stripe_locks_root;
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fstripe_start = get_full_stripe_logical(bg_cache, bytenr);
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/* Now insert the full stripe lock */
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mutex_lock(&locks_root->lock);
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existing = insert_full_stripe_lock(locks_root, fstripe_start);
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mutex_unlock(&locks_root->lock);
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if (IS_ERR(existing)) {
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ret = PTR_ERR(existing);
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goto out;
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}
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mutex_lock(&existing->mutex);
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*locked_ret = true;
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out:
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btrfs_put_block_group(bg_cache);
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return ret;
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}
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/*
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* Unlock a full stripe.
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*
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* NOTE: Caller must ensure it's the same context calling corresponding
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* lock_full_stripe().
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*
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* Return 0 if we unlock full stripe without problem.
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* Return <0 for error
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*/
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static int unlock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr,
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bool locked)
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{
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struct btrfs_block_group_cache *bg_cache;
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struct btrfs_full_stripe_locks_tree *locks_root;
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struct full_stripe_lock *fstripe_lock;
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u64 fstripe_start;
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bool freeit = false;
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int ret = 0;
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/* If we didn't acquire full stripe lock, no need to continue */
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if (!locked)
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return 0;
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bg_cache = btrfs_lookup_block_group(fs_info, bytenr);
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if (!bg_cache) {
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ASSERT(0);
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return -ENOENT;
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}
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if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK))
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goto out;
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locks_root = &bg_cache->full_stripe_locks_root;
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fstripe_start = get_full_stripe_logical(bg_cache, bytenr);
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mutex_lock(&locks_root->lock);
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fstripe_lock = search_full_stripe_lock(locks_root, fstripe_start);
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/* Unpaired unlock_full_stripe() detected */
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if (!fstripe_lock) {
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|
WARN_ON(1);
|
|
ret = -ENOENT;
|
|
mutex_unlock(&locks_root->lock);
|
|
goto out;
|
|
}
|
|
|
|
if (fstripe_lock->refs == 0) {
|
|
WARN_ON(1);
|
|
btrfs_warn(fs_info, "full stripe lock at %llu refcount underflow",
|
|
fstripe_lock->logical);
|
|
} else {
|
|
fstripe_lock->refs--;
|
|
}
|
|
|
|
if (fstripe_lock->refs == 0) {
|
|
rb_erase(&fstripe_lock->node, &locks_root->root);
|
|
freeit = true;
|
|
}
|
|
mutex_unlock(&locks_root->lock);
|
|
|
|
mutex_unlock(&fstripe_lock->mutex);
|
|
if (freeit)
|
|
kfree(fstripe_lock);
|
|
out:
|
|
btrfs_put_block_group(bg_cache);
|
|
return ret;
|
|
}
|
|
|
|
static void scrub_free_csums(struct scrub_ctx *sctx)
|
|
{
|
|
while (!list_empty(&sctx->csum_list)) {
|
|
struct btrfs_ordered_sum *sum;
|
|
sum = list_first_entry(&sctx->csum_list,
|
|
struct btrfs_ordered_sum, list);
|
|
list_del(&sum->list);
|
|
kfree(sum);
|
|
}
|
|
}
|
|
|
|
static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
|
|
{
|
|
int i;
|
|
|
|
if (!sctx)
|
|
return;
|
|
|
|
/* this can happen when scrub is cancelled */
|
|
if (sctx->curr != -1) {
|
|
struct scrub_bio *sbio = sctx->bios[sctx->curr];
|
|
|
|
for (i = 0; i < sbio->page_count; i++) {
|
|
WARN_ON(!sbio->pagev[i]->page);
|
|
scrub_block_put(sbio->pagev[i]->sblock);
|
|
}
|
|
bio_put(sbio->bio);
|
|
}
|
|
|
|
for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
|
|
struct scrub_bio *sbio = sctx->bios[i];
|
|
|
|
if (!sbio)
|
|
break;
|
|
kfree(sbio);
|
|
}
|
|
|
|
kfree(sctx->wr_curr_bio);
|
|
scrub_free_csums(sctx);
|
|
kfree(sctx);
|
|
}
|
|
|
|
static void scrub_put_ctx(struct scrub_ctx *sctx)
|
|
{
|
|
if (refcount_dec_and_test(&sctx->refs))
|
|
scrub_free_ctx(sctx);
|
|
}
|
|
|
|
static noinline_for_stack struct scrub_ctx *scrub_setup_ctx(
|
|
struct btrfs_fs_info *fs_info, int is_dev_replace)
|
|
{
|
|
struct scrub_ctx *sctx;
|
|
int i;
|
|
|
|
sctx = kzalloc(sizeof(*sctx), GFP_KERNEL);
|
|
if (!sctx)
|
|
goto nomem;
|
|
refcount_set(&sctx->refs, 1);
|
|
sctx->is_dev_replace = is_dev_replace;
|
|
sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
|
|
sctx->curr = -1;
|
|
sctx->fs_info = fs_info;
|
|
INIT_LIST_HEAD(&sctx->csum_list);
|
|
for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
|
|
struct scrub_bio *sbio;
|
|
|
|
sbio = kzalloc(sizeof(*sbio), GFP_KERNEL);
|
|
if (!sbio)
|
|
goto nomem;
|
|
sctx->bios[i] = sbio;
|
|
|
|
sbio->index = i;
|
|
sbio->sctx = sctx;
|
|
sbio->page_count = 0;
|
|
btrfs_init_work(&sbio->work, btrfs_scrub_helper,
|
|
scrub_bio_end_io_worker, NULL, NULL);
|
|
|
|
if (i != SCRUB_BIOS_PER_SCTX - 1)
|
|
sctx->bios[i]->next_free = i + 1;
|
|
else
|
|
sctx->bios[i]->next_free = -1;
|
|
}
|
|
sctx->first_free = 0;
|
|
atomic_set(&sctx->bios_in_flight, 0);
|
|
atomic_set(&sctx->workers_pending, 0);
|
|
atomic_set(&sctx->cancel_req, 0);
|
|
sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
|
|
|
|
spin_lock_init(&sctx->list_lock);
|
|
spin_lock_init(&sctx->stat_lock);
|
|
init_waitqueue_head(&sctx->list_wait);
|
|
|
|
WARN_ON(sctx->wr_curr_bio != NULL);
|
|
mutex_init(&sctx->wr_lock);
|
|
sctx->wr_curr_bio = NULL;
|
|
if (is_dev_replace) {
|
|
WARN_ON(!fs_info->dev_replace.tgtdev);
|
|
sctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO;
|
|
sctx->wr_tgtdev = fs_info->dev_replace.tgtdev;
|
|
sctx->flush_all_writes = false;
|
|
}
|
|
|
|
return sctx;
|
|
|
|
nomem:
|
|
scrub_free_ctx(sctx);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
|
|
void *warn_ctx)
|
|
{
|
|
u64 isize;
|
|
u32 nlink;
|
|
int ret;
|
|
int i;
|
|
unsigned nofs_flag;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct scrub_warning *swarn = warn_ctx;
|
|
struct btrfs_fs_info *fs_info = swarn->dev->fs_info;
|
|
struct inode_fs_paths *ipath = NULL;
|
|
struct btrfs_root *local_root;
|
|
struct btrfs_key root_key;
|
|
struct btrfs_key key;
|
|
|
|
root_key.objectid = root;
|
|
root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root_key.offset = (u64)-1;
|
|
local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
|
|
if (IS_ERR(local_root)) {
|
|
ret = PTR_ERR(local_root);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* this makes the path point to (inum INODE_ITEM ioff)
|
|
*/
|
|
key.objectid = inum;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
|
|
if (ret) {
|
|
btrfs_release_path(swarn->path);
|
|
goto err;
|
|
}
|
|
|
|
eb = swarn->path->nodes[0];
|
|
inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
|
|
struct btrfs_inode_item);
|
|
isize = btrfs_inode_size(eb, inode_item);
|
|
nlink = btrfs_inode_nlink(eb, inode_item);
|
|
btrfs_release_path(swarn->path);
|
|
|
|
/*
|
|
* init_path might indirectly call vmalloc, or use GFP_KERNEL. Scrub
|
|
* uses GFP_NOFS in this context, so we keep it consistent but it does
|
|
* not seem to be strictly necessary.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
ipath = init_ipath(4096, local_root, swarn->path);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (IS_ERR(ipath)) {
|
|
ret = PTR_ERR(ipath);
|
|
ipath = NULL;
|
|
goto err;
|
|
}
|
|
ret = paths_from_inode(inum, ipath);
|
|
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
/*
|
|
* we deliberately ignore the bit ipath might have been too small to
|
|
* hold all of the paths here
|
|
*/
|
|
for (i = 0; i < ipath->fspath->elem_cnt; ++i)
|
|
btrfs_warn_in_rcu(fs_info,
|
|
"%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %llu, links %u (path: %s)",
|
|
swarn->errstr, swarn->logical,
|
|
rcu_str_deref(swarn->dev->name),
|
|
swarn->physical,
|
|
root, inum, offset,
|
|
min(isize - offset, (u64)PAGE_SIZE), nlink,
|
|
(char *)(unsigned long)ipath->fspath->val[i]);
|
|
|
|
free_ipath(ipath);
|
|
return 0;
|
|
|
|
err:
|
|
btrfs_warn_in_rcu(fs_info,
|
|
"%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d",
|
|
swarn->errstr, swarn->logical,
|
|
rcu_str_deref(swarn->dev->name),
|
|
swarn->physical,
|
|
root, inum, offset, ret);
|
|
|
|
free_ipath(ipath);
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
|
|
{
|
|
struct btrfs_device *dev;
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key found_key;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_extent_item *ei;
|
|
struct scrub_warning swarn;
|
|
unsigned long ptr = 0;
|
|
u64 extent_item_pos;
|
|
u64 flags = 0;
|
|
u64 ref_root;
|
|
u32 item_size;
|
|
u8 ref_level = 0;
|
|
int ret;
|
|
|
|
WARN_ON(sblock->page_count < 1);
|
|
dev = sblock->pagev[0]->dev;
|
|
fs_info = sblock->sctx->fs_info;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return;
|
|
|
|
swarn.physical = sblock->pagev[0]->physical;
|
|
swarn.logical = sblock->pagev[0]->logical;
|
|
swarn.errstr = errstr;
|
|
swarn.dev = NULL;
|
|
|
|
ret = extent_from_logical(fs_info, swarn.logical, path, &found_key,
|
|
&flags);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
extent_item_pos = swarn.logical - found_key.objectid;
|
|
swarn.extent_item_size = found_key.offset;
|
|
|
|
eb = path->nodes[0];
|
|
ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
|
|
item_size = btrfs_item_size_nr(eb, path->slots[0]);
|
|
|
|
if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
|
do {
|
|
ret = tree_backref_for_extent(&ptr, eb, &found_key, ei,
|
|
item_size, &ref_root,
|
|
&ref_level);
|
|
btrfs_warn_in_rcu(fs_info,
|
|
"%s at logical %llu on dev %s, physical %llu: metadata %s (level %d) in tree %llu",
|
|
errstr, swarn.logical,
|
|
rcu_str_deref(dev->name),
|
|
swarn.physical,
|
|
ref_level ? "node" : "leaf",
|
|
ret < 0 ? -1 : ref_level,
|
|
ret < 0 ? -1 : ref_root);
|
|
} while (ret != 1);
|
|
btrfs_release_path(path);
|
|
} else {
|
|
btrfs_release_path(path);
|
|
swarn.path = path;
|
|
swarn.dev = dev;
|
|
iterate_extent_inodes(fs_info, found_key.objectid,
|
|
extent_item_pos, 1,
|
|
scrub_print_warning_inode, &swarn, false);
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
}
|
|
|
|
static inline void scrub_get_recover(struct scrub_recover *recover)
|
|
{
|
|
refcount_inc(&recover->refs);
|
|
}
|
|
|
|
static inline void scrub_put_recover(struct btrfs_fs_info *fs_info,
|
|
struct scrub_recover *recover)
|
|
{
|
|
if (refcount_dec_and_test(&recover->refs)) {
|
|
btrfs_bio_counter_dec(fs_info);
|
|
btrfs_put_bbio(recover->bbio);
|
|
kfree(recover);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* scrub_handle_errored_block gets called when either verification of the
|
|
* pages failed or the bio failed to read, e.g. with EIO. In the latter
|
|
* case, this function handles all pages in the bio, even though only one
|
|
* may be bad.
|
|
* The goal of this function is to repair the errored block by using the
|
|
* contents of one of the mirrors.
|
|
*/
|
|
static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
|
|
{
|
|
struct scrub_ctx *sctx = sblock_to_check->sctx;
|
|
struct btrfs_device *dev;
|
|
struct btrfs_fs_info *fs_info;
|
|
u64 logical;
|
|
unsigned int failed_mirror_index;
|
|
unsigned int is_metadata;
|
|
unsigned int have_csum;
|
|
struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */
|
|
struct scrub_block *sblock_bad;
|
|
int ret;
|
|
int mirror_index;
|
|
int page_num;
|
|
int success;
|
|
bool full_stripe_locked;
|
|
unsigned int nofs_flag;
|
|
static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
|
|
DEFAULT_RATELIMIT_BURST);
|
|
|
|
BUG_ON(sblock_to_check->page_count < 1);
|
|
fs_info = sctx->fs_info;
|
|
if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
|
|
/*
|
|
* 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(&sctx->stat_lock);
|
|
++sctx->stat.super_errors;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return 0;
|
|
}
|
|
logical = sblock_to_check->pagev[0]->logical;
|
|
BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
|
|
failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
|
|
is_metadata = !(sblock_to_check->pagev[0]->flags &
|
|
BTRFS_EXTENT_FLAG_DATA);
|
|
have_csum = sblock_to_check->pagev[0]->have_csum;
|
|
dev = sblock_to_check->pagev[0]->dev;
|
|
|
|
/*
|
|
* We must use GFP_NOFS because the scrub task might be waiting for a
|
|
* worker task executing this function and in turn a transaction commit
|
|
* might be waiting the scrub task to pause (which needs to wait for all
|
|
* the worker tasks to complete before pausing).
|
|
* We do allocations in the workers through insert_full_stripe_lock()
|
|
* and scrub_add_page_to_wr_bio(), which happens down the call chain of
|
|
* this function.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
/*
|
|
* For RAID5/6, race can happen for a different device scrub thread.
|
|
* For data corruption, Parity and Data threads will both try
|
|
* to recovery the data.
|
|
* Race can lead to doubly added csum error, or even unrecoverable
|
|
* error.
|
|
*/
|
|
ret = lock_full_stripe(fs_info, logical, &full_stripe_locked);
|
|
if (ret < 0) {
|
|
memalloc_nofs_restore(nofs_flag);
|
|
spin_lock(&sctx->stat_lock);
|
|
if (ret == -ENOMEM)
|
|
sctx->stat.malloc_errors++;
|
|
sctx->stat.read_errors++;
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* read all mirrors one after the other. This includes to
|
|
* re-read the extent or metadata block that failed (that was
|
|
* the cause that this fixup code is called) another time,
|
|
* page by page this time in order to know which pages
|
|
* caused I/O errors and which ones are good (for all mirrors).
|
|
* It is the goal to handle the situation when more than one
|
|
* mirror contains I/O errors, but the errors do not
|
|
* overlap, i.e. the data can be repaired by selecting the
|
|
* pages from those mirrors without I/O error on the
|
|
* particular pages. One example (with blocks >= 2 * PAGE_SIZE)
|
|
* would be that mirror #1 has an I/O error on the first page,
|
|
* the second page is good, and mirror #2 has an I/O error on
|
|
* the second page, but the first page is good.
|
|
* Then the first page of the first mirror can be repaired by
|
|
* taking the first page of the second mirror, and the
|
|
* second page of the second mirror can be repaired by
|
|
* copying the contents of the 2nd page of the 1st mirror.
|
|
* One more note: if the pages of one mirror contain I/O
|
|
* errors, the checksum cannot be verified. In order to get
|
|
* the best data for repairing, the first attempt is to find
|
|
* a mirror without I/O errors and with a validated checksum.
|
|
* Only if this is not possible, the pages are picked from
|
|
* mirrors with I/O errors without considering the checksum.
|
|
* If the latter is the case, at the end, the checksum of the
|
|
* repaired area is verified in order to correctly maintain
|
|
* the statistics.
|
|
*/
|
|
|
|
sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS,
|
|
sizeof(*sblocks_for_recheck), GFP_KERNEL);
|
|
if (!sblocks_for_recheck) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
sctx->stat.read_errors++;
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
|
|
goto out;
|
|
}
|
|
|
|
/* setup the context, map the logical blocks and alloc the pages */
|
|
ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck);
|
|
if (ret) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.read_errors++;
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
|
|
goto out;
|
|
}
|
|
BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
|
|
sblock_bad = sblocks_for_recheck + failed_mirror_index;
|
|
|
|
/* build and submit the bios for the failed mirror, check checksums */
|
|
scrub_recheck_block(fs_info, sblock_bad, 1);
|
|
|
|
if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
|
|
sblock_bad->no_io_error_seen) {
|
|
/*
|
|
* the error disappeared after reading page by page, or
|
|
* the area was part of a huge bio and other parts of the
|
|
* bio caused I/O errors, or the block layer merged several
|
|
* read requests into one and the error is caused by a
|
|
* different bio (usually one of the two latter cases is
|
|
* the cause)
|
|
*/
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.unverified_errors++;
|
|
sblock_to_check->data_corrected = 1;
|
|
spin_unlock(&sctx->stat_lock);
|
|
|
|
if (sctx->is_dev_replace)
|
|
scrub_write_block_to_dev_replace(sblock_bad);
|
|
goto out;
|
|
}
|
|
|
|
if (!sblock_bad->no_io_error_seen) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.read_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
if (__ratelimit(&_rs))
|
|
scrub_print_warning("i/o error", sblock_to_check);
|
|
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
|
|
} else if (sblock_bad->checksum_error) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.csum_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
if (__ratelimit(&_rs))
|
|
scrub_print_warning("checksum error", sblock_to_check);
|
|
btrfs_dev_stat_inc_and_print(dev,
|
|
BTRFS_DEV_STAT_CORRUPTION_ERRS);
|
|
} else if (sblock_bad->header_error) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.verify_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
if (__ratelimit(&_rs))
|
|
scrub_print_warning("checksum/header error",
|
|
sblock_to_check);
|
|
if (sblock_bad->generation_error)
|
|
btrfs_dev_stat_inc_and_print(dev,
|
|
BTRFS_DEV_STAT_GENERATION_ERRS);
|
|
else
|
|
btrfs_dev_stat_inc_and_print(dev,
|
|
BTRFS_DEV_STAT_CORRUPTION_ERRS);
|
|
}
|
|
|
|
if (sctx->readonly) {
|
|
ASSERT(!sctx->is_dev_replace);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* now build and submit the bios for the other mirrors, check
|
|
* checksums.
|
|
* First try to pick the mirror which is completely without I/O
|
|
* errors and also does not have a checksum error.
|
|
* If one is found, and if a checksum is present, the full block
|
|
* that is known to contain an error is rewritten. Afterwards
|
|
* the block is known to be corrected.
|
|
* If a mirror is found which is completely correct, and no
|
|
* checksum is present, only those pages are rewritten that had
|
|
* an I/O error in the block to be repaired, since it cannot be
|
|
* determined, which copy of the other pages is better (and it
|
|
* could happen otherwise that a correct page would be
|
|
* overwritten by a bad one).
|
|
*/
|
|
for (mirror_index = 0; ;mirror_index++) {
|
|
struct scrub_block *sblock_other;
|
|
|
|
if (mirror_index == failed_mirror_index)
|
|
continue;
|
|
|
|
/* raid56's mirror can be more than BTRFS_MAX_MIRRORS */
|
|
if (!scrub_is_page_on_raid56(sblock_bad->pagev[0])) {
|
|
if (mirror_index >= BTRFS_MAX_MIRRORS)
|
|
break;
|
|
if (!sblocks_for_recheck[mirror_index].page_count)
|
|
break;
|
|
|
|
sblock_other = sblocks_for_recheck + mirror_index;
|
|
} else {
|
|
struct scrub_recover *r = sblock_bad->pagev[0]->recover;
|
|
int max_allowed = r->bbio->num_stripes -
|
|
r->bbio->num_tgtdevs;
|
|
|
|
if (mirror_index >= max_allowed)
|
|
break;
|
|
if (!sblocks_for_recheck[1].page_count)
|
|
break;
|
|
|
|
ASSERT(failed_mirror_index == 0);
|
|
sblock_other = sblocks_for_recheck + 1;
|
|
sblock_other->pagev[0]->mirror_num = 1 + mirror_index;
|
|
}
|
|
|
|
/* build and submit the bios, check checksums */
|
|
scrub_recheck_block(fs_info, sblock_other, 0);
|
|
|
|
if (!sblock_other->header_error &&
|
|
!sblock_other->checksum_error &&
|
|
sblock_other->no_io_error_seen) {
|
|
if (sctx->is_dev_replace) {
|
|
scrub_write_block_to_dev_replace(sblock_other);
|
|
goto corrected_error;
|
|
} else {
|
|
ret = scrub_repair_block_from_good_copy(
|
|
sblock_bad, sblock_other);
|
|
if (!ret)
|
|
goto corrected_error;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace)
|
|
goto did_not_correct_error;
|
|
|
|
/*
|
|
* In case of I/O errors in the area that is supposed to be
|
|
* repaired, continue by picking good copies of those pages.
|
|
* Select the good pages from mirrors to rewrite bad pages from
|
|
* the area to fix. Afterwards verify the checksum of the block
|
|
* that is supposed to be repaired. This verification step is
|
|
* only done for the purpose of statistic counting and for the
|
|
* final scrub report, whether errors remain.
|
|
* A perfect algorithm could make use of the checksum and try
|
|
* all possible combinations of pages from the different mirrors
|
|
* until the checksum verification succeeds. For example, when
|
|
* the 2nd page of mirror #1 faces I/O errors, and the 2nd page
|
|
* of mirror #2 is readable but the final checksum test fails,
|
|
* then the 2nd page of mirror #3 could be tried, whether now
|
|
* the final checksum succeeds. But this would be a rare
|
|
* exception and is therefore not implemented. At least it is
|
|
* avoided that the good copy is overwritten.
|
|
* A more useful improvement would be to pick the sectors
|
|
* without I/O error based on sector sizes (512 bytes on legacy
|
|
* disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
|
|
* mirror could be repaired by taking 512 byte of a different
|
|
* mirror, even if other 512 byte sectors in the same PAGE_SIZE
|
|
* area are unreadable.
|
|
*/
|
|
success = 1;
|
|
for (page_num = 0; page_num < sblock_bad->page_count;
|
|
page_num++) {
|
|
struct scrub_page *page_bad = sblock_bad->pagev[page_num];
|
|
struct scrub_block *sblock_other = NULL;
|
|
|
|
/* skip no-io-error page in scrub */
|
|
if (!page_bad->io_error && !sctx->is_dev_replace)
|
|
continue;
|
|
|
|
if (scrub_is_page_on_raid56(sblock_bad->pagev[0])) {
|
|
/*
|
|
* In case of dev replace, if raid56 rebuild process
|
|
* didn't work out correct data, then copy the content
|
|
* in sblock_bad to make sure target device is identical
|
|
* to source device, instead of writing garbage data in
|
|
* sblock_for_recheck array to target device.
|
|
*/
|
|
sblock_other = NULL;
|
|
} else if (page_bad->io_error) {
|
|
/* try to find no-io-error page in mirrors */
|
|
for (mirror_index = 0;
|
|
mirror_index < BTRFS_MAX_MIRRORS &&
|
|
sblocks_for_recheck[mirror_index].page_count > 0;
|
|
mirror_index++) {
|
|
if (!sblocks_for_recheck[mirror_index].
|
|
pagev[page_num]->io_error) {
|
|
sblock_other = sblocks_for_recheck +
|
|
mirror_index;
|
|
break;
|
|
}
|
|
}
|
|
if (!sblock_other)
|
|
success = 0;
|
|
}
|
|
|
|
if (sctx->is_dev_replace) {
|
|
/*
|
|
* did not find a mirror to fetch the page
|
|
* from. scrub_write_page_to_dev_replace()
|
|
* handles this case (page->io_error), by
|
|
* filling the block with zeros before
|
|
* submitting the write request
|
|
*/
|
|
if (!sblock_other)
|
|
sblock_other = sblock_bad;
|
|
|
|
if (scrub_write_page_to_dev_replace(sblock_other,
|
|
page_num) != 0) {
|
|
atomic64_inc(
|
|
&fs_info->dev_replace.num_write_errors);
|
|
success = 0;
|
|
}
|
|
} else if (sblock_other) {
|
|
ret = scrub_repair_page_from_good_copy(sblock_bad,
|
|
sblock_other,
|
|
page_num, 0);
|
|
if (0 == ret)
|
|
page_bad->io_error = 0;
|
|
else
|
|
success = 0;
|
|
}
|
|
}
|
|
|
|
if (success && !sctx->is_dev_replace) {
|
|
if (is_metadata || have_csum) {
|
|
/*
|
|
* need to verify the checksum now that all
|
|
* sectors on disk are repaired (the write
|
|
* request for data to be repaired is on its way).
|
|
* Just be lazy and use scrub_recheck_block()
|
|
* which re-reads the data before the checksum
|
|
* is verified, but most likely the data comes out
|
|
* of the page cache.
|
|
*/
|
|
scrub_recheck_block(fs_info, sblock_bad, 1);
|
|
if (!sblock_bad->header_error &&
|
|
!sblock_bad->checksum_error &&
|
|
sblock_bad->no_io_error_seen)
|
|
goto corrected_error;
|
|
else
|
|
goto did_not_correct_error;
|
|
} else {
|
|
corrected_error:
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.corrected_errors++;
|
|
sblock_to_check->data_corrected = 1;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_err_rl_in_rcu(fs_info,
|
|
"fixed up error at logical %llu on dev %s",
|
|
logical, rcu_str_deref(dev->name));
|
|
}
|
|
} else {
|
|
did_not_correct_error:
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_err_rl_in_rcu(fs_info,
|
|
"unable to fixup (regular) error at logical %llu on dev %s",
|
|
logical, rcu_str_deref(dev->name));
|
|
}
|
|
|
|
out:
|
|
if (sblocks_for_recheck) {
|
|
for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS;
|
|
mirror_index++) {
|
|
struct scrub_block *sblock = sblocks_for_recheck +
|
|
mirror_index;
|
|
struct scrub_recover *recover;
|
|
int page_index;
|
|
|
|
for (page_index = 0; page_index < sblock->page_count;
|
|
page_index++) {
|
|
sblock->pagev[page_index]->sblock = NULL;
|
|
recover = sblock->pagev[page_index]->recover;
|
|
if (recover) {
|
|
scrub_put_recover(fs_info, recover);
|
|
sblock->pagev[page_index]->recover =
|
|
NULL;
|
|
}
|
|
scrub_page_put(sblock->pagev[page_index]);
|
|
}
|
|
}
|
|
kfree(sblocks_for_recheck);
|
|
}
|
|
|
|
ret = unlock_full_stripe(fs_info, logical, full_stripe_locked);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio)
|
|
{
|
|
if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5)
|
|
return 2;
|
|
else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6)
|
|
return 3;
|
|
else
|
|
return (int)bbio->num_stripes;
|
|
}
|
|
|
|
static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type,
|
|
u64 *raid_map,
|
|
u64 mapped_length,
|
|
int nstripes, int mirror,
|
|
int *stripe_index,
|
|
u64 *stripe_offset)
|
|
{
|
|
int i;
|
|
|
|
if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
|
|
/* RAID5/6 */
|
|
for (i = 0; i < nstripes; i++) {
|
|
if (raid_map[i] == RAID6_Q_STRIPE ||
|
|
raid_map[i] == RAID5_P_STRIPE)
|
|
continue;
|
|
|
|
if (logical >= raid_map[i] &&
|
|
logical < raid_map[i] + mapped_length)
|
|
break;
|
|
}
|
|
|
|
*stripe_index = i;
|
|
*stripe_offset = logical - raid_map[i];
|
|
} else {
|
|
/* The other RAID type */
|
|
*stripe_index = mirror;
|
|
*stripe_offset = 0;
|
|
}
|
|
}
|
|
|
|
static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
|
|
struct scrub_block *sblocks_for_recheck)
|
|
{
|
|
struct scrub_ctx *sctx = original_sblock->sctx;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
u64 length = original_sblock->page_count * PAGE_SIZE;
|
|
u64 logical = original_sblock->pagev[0]->logical;
|
|
u64 generation = original_sblock->pagev[0]->generation;
|
|
u64 flags = original_sblock->pagev[0]->flags;
|
|
u64 have_csum = original_sblock->pagev[0]->have_csum;
|
|
struct scrub_recover *recover;
|
|
struct btrfs_bio *bbio;
|
|
u64 sublen;
|
|
u64 mapped_length;
|
|
u64 stripe_offset;
|
|
int stripe_index;
|
|
int page_index = 0;
|
|
int mirror_index;
|
|
int nmirrors;
|
|
int ret;
|
|
|
|
/*
|
|
* note: the two members refs and outstanding_pages
|
|
* are not used (and not set) in the blocks that are used for
|
|
* the recheck procedure
|
|
*/
|
|
|
|
while (length > 0) {
|
|
sublen = min_t(u64, length, PAGE_SIZE);
|
|
mapped_length = sublen;
|
|
bbio = NULL;
|
|
|
|
/*
|
|
* with a length of PAGE_SIZE, each returned stripe
|
|
* represents one mirror
|
|
*/
|
|
btrfs_bio_counter_inc_blocked(fs_info);
|
|
ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS,
|
|
logical, &mapped_length, &bbio);
|
|
if (ret || !bbio || mapped_length < sublen) {
|
|
btrfs_put_bbio(bbio);
|
|
btrfs_bio_counter_dec(fs_info);
|
|
return -EIO;
|
|
}
|
|
|
|
recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
|
|
if (!recover) {
|
|
btrfs_put_bbio(bbio);
|
|
btrfs_bio_counter_dec(fs_info);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
refcount_set(&recover->refs, 1);
|
|
recover->bbio = bbio;
|
|
recover->map_length = mapped_length;
|
|
|
|
BUG_ON(page_index >= SCRUB_MAX_PAGES_PER_BLOCK);
|
|
|
|
nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS);
|
|
|
|
for (mirror_index = 0; mirror_index < nmirrors;
|
|
mirror_index++) {
|
|
struct scrub_block *sblock;
|
|
struct scrub_page *page;
|
|
|
|
sblock = sblocks_for_recheck + mirror_index;
|
|
sblock->sctx = sctx;
|
|
|
|
page = kzalloc(sizeof(*page), GFP_NOFS);
|
|
if (!page) {
|
|
leave_nomem:
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
scrub_put_recover(fs_info, recover);
|
|
return -ENOMEM;
|
|
}
|
|
scrub_page_get(page);
|
|
sblock->pagev[page_index] = page;
|
|
page->sblock = sblock;
|
|
page->flags = flags;
|
|
page->generation = generation;
|
|
page->logical = logical;
|
|
page->have_csum = have_csum;
|
|
if (have_csum)
|
|
memcpy(page->csum,
|
|
original_sblock->pagev[0]->csum,
|
|
sctx->csum_size);
|
|
|
|
scrub_stripe_index_and_offset(logical,
|
|
bbio->map_type,
|
|
bbio->raid_map,
|
|
mapped_length,
|
|
bbio->num_stripes -
|
|
bbio->num_tgtdevs,
|
|
mirror_index,
|
|
&stripe_index,
|
|
&stripe_offset);
|
|
page->physical = bbio->stripes[stripe_index].physical +
|
|
stripe_offset;
|
|
page->dev = bbio->stripes[stripe_index].dev;
|
|
|
|
BUG_ON(page_index >= original_sblock->page_count);
|
|
page->physical_for_dev_replace =
|
|
original_sblock->pagev[page_index]->
|
|
physical_for_dev_replace;
|
|
/* for missing devices, dev->bdev is NULL */
|
|
page->mirror_num = mirror_index + 1;
|
|
sblock->page_count++;
|
|
page->page = alloc_page(GFP_NOFS);
|
|
if (!page->page)
|
|
goto leave_nomem;
|
|
|
|
scrub_get_recover(recover);
|
|
page->recover = recover;
|
|
}
|
|
scrub_put_recover(fs_info, recover);
|
|
length -= sublen;
|
|
logical += sublen;
|
|
page_index++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_bio_wait_endio(struct bio *bio)
|
|
{
|
|
complete(bio->bi_private);
|
|
}
|
|
|
|
static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
|
|
struct bio *bio,
|
|
struct scrub_page *page)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(done);
|
|
int ret;
|
|
int mirror_num;
|
|
|
|
bio->bi_iter.bi_sector = page->logical >> 9;
|
|
bio->bi_private = &done;
|
|
bio->bi_end_io = scrub_bio_wait_endio;
|
|
|
|
mirror_num = page->sblock->pagev[0]->mirror_num;
|
|
ret = raid56_parity_recover(fs_info, bio, page->recover->bbio,
|
|
page->recover->map_length,
|
|
mirror_num, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
wait_for_completion_io(&done);
|
|
return blk_status_to_errno(bio->bi_status);
|
|
}
|
|
|
|
static void scrub_recheck_block_on_raid56(struct btrfs_fs_info *fs_info,
|
|
struct scrub_block *sblock)
|
|
{
|
|
struct scrub_page *first_page = sblock->pagev[0];
|
|
struct bio *bio;
|
|
int page_num;
|
|
|
|
/* All pages in sblock belong to the same stripe on the same device. */
|
|
ASSERT(first_page->dev);
|
|
if (!first_page->dev->bdev)
|
|
goto out;
|
|
|
|
bio = btrfs_io_bio_alloc(BIO_MAX_PAGES);
|
|
bio_set_dev(bio, first_page->dev->bdev);
|
|
|
|
for (page_num = 0; page_num < sblock->page_count; page_num++) {
|
|
struct scrub_page *page = sblock->pagev[page_num];
|
|
|
|
WARN_ON(!page->page);
|
|
bio_add_page(bio, page->page, PAGE_SIZE, 0);
|
|
}
|
|
|
|
if (scrub_submit_raid56_bio_wait(fs_info, bio, first_page)) {
|
|
bio_put(bio);
|
|
goto out;
|
|
}
|
|
|
|
bio_put(bio);
|
|
|
|
scrub_recheck_block_checksum(sblock);
|
|
|
|
return;
|
|
out:
|
|
for (page_num = 0; page_num < sblock->page_count; page_num++)
|
|
sblock->pagev[page_num]->io_error = 1;
|
|
|
|
sblock->no_io_error_seen = 0;
|
|
}
|
|
|
|
/*
|
|
* this function will check the on disk data for checksum errors, header
|
|
* errors and read I/O errors. If any I/O errors happen, the exact pages
|
|
* which are errored are marked as being bad. The goal is to enable scrub
|
|
* to take those pages that are not errored from all the mirrors so that
|
|
* the pages that are errored in the just handled mirror can be repaired.
|
|
*/
|
|
static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
|
|
struct scrub_block *sblock,
|
|
int retry_failed_mirror)
|
|
{
|
|
int page_num;
|
|
|
|
sblock->no_io_error_seen = 1;
|
|
|
|
/* short cut for raid56 */
|
|
if (!retry_failed_mirror && scrub_is_page_on_raid56(sblock->pagev[0]))
|
|
return scrub_recheck_block_on_raid56(fs_info, sblock);
|
|
|
|
for (page_num = 0; page_num < sblock->page_count; page_num++) {
|
|
struct bio *bio;
|
|
struct scrub_page *page = sblock->pagev[page_num];
|
|
|
|
if (page->dev->bdev == NULL) {
|
|
page->io_error = 1;
|
|
sblock->no_io_error_seen = 0;
|
|
continue;
|
|
}
|
|
|
|
WARN_ON(!page->page);
|
|
bio = btrfs_io_bio_alloc(1);
|
|
bio_set_dev(bio, page->dev->bdev);
|
|
|
|
bio_add_page(bio, page->page, PAGE_SIZE, 0);
|
|
bio->bi_iter.bi_sector = page->physical >> 9;
|
|
bio->bi_opf = REQ_OP_READ;
|
|
|
|
if (btrfsic_submit_bio_wait(bio)) {
|
|
page->io_error = 1;
|
|
sblock->no_io_error_seen = 0;
|
|
}
|
|
|
|
bio_put(bio);
|
|
}
|
|
|
|
if (sblock->no_io_error_seen)
|
|
scrub_recheck_block_checksum(sblock);
|
|
}
|
|
|
|
static inline int scrub_check_fsid(u8 fsid[],
|
|
struct scrub_page *spage)
|
|
{
|
|
struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
|
|
int ret;
|
|
|
|
ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
|
|
return !ret;
|
|
}
|
|
|
|
static void scrub_recheck_block_checksum(struct scrub_block *sblock)
|
|
{
|
|
sblock->header_error = 0;
|
|
sblock->checksum_error = 0;
|
|
sblock->generation_error = 0;
|
|
|
|
if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA)
|
|
scrub_checksum_data(sblock);
|
|
else
|
|
scrub_checksum_tree_block(sblock);
|
|
}
|
|
|
|
static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
|
|
struct scrub_block *sblock_good)
|
|
{
|
|
int page_num;
|
|
int ret = 0;
|
|
|
|
for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
|
|
int ret_sub;
|
|
|
|
ret_sub = scrub_repair_page_from_good_copy(sblock_bad,
|
|
sblock_good,
|
|
page_num, 1);
|
|
if (ret_sub)
|
|
ret = ret_sub;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
|
|
struct scrub_block *sblock_good,
|
|
int page_num, int force_write)
|
|
{
|
|
struct scrub_page *page_bad = sblock_bad->pagev[page_num];
|
|
struct scrub_page *page_good = sblock_good->pagev[page_num];
|
|
struct btrfs_fs_info *fs_info = sblock_bad->sctx->fs_info;
|
|
|
|
BUG_ON(page_bad->page == NULL);
|
|
BUG_ON(page_good->page == NULL);
|
|
if (force_write || sblock_bad->header_error ||
|
|
sblock_bad->checksum_error || page_bad->io_error) {
|
|
struct bio *bio;
|
|
int ret;
|
|
|
|
if (!page_bad->dev->bdev) {
|
|
btrfs_warn_rl(fs_info,
|
|
"scrub_repair_page_from_good_copy(bdev == NULL) is unexpected");
|
|
return -EIO;
|
|
}
|
|
|
|
bio = btrfs_io_bio_alloc(1);
|
|
bio_set_dev(bio, page_bad->dev->bdev);
|
|
bio->bi_iter.bi_sector = page_bad->physical >> 9;
|
|
bio->bi_opf = REQ_OP_WRITE;
|
|
|
|
ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0);
|
|
if (PAGE_SIZE != ret) {
|
|
bio_put(bio);
|
|
return -EIO;
|
|
}
|
|
|
|
if (btrfsic_submit_bio_wait(bio)) {
|
|
btrfs_dev_stat_inc_and_print(page_bad->dev,
|
|
BTRFS_DEV_STAT_WRITE_ERRS);
|
|
atomic64_inc(&fs_info->dev_replace.num_write_errors);
|
|
bio_put(bio);
|
|
return -EIO;
|
|
}
|
|
bio_put(bio);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
|
|
{
|
|
struct btrfs_fs_info *fs_info = sblock->sctx->fs_info;
|
|
int page_num;
|
|
|
|
/*
|
|
* This block is used for the check of the parity on the source device,
|
|
* so the data needn't be written into the destination device.
|
|
*/
|
|
if (sblock->sparity)
|
|
return;
|
|
|
|
for (page_num = 0; page_num < sblock->page_count; page_num++) {
|
|
int ret;
|
|
|
|
ret = scrub_write_page_to_dev_replace(sblock, page_num);
|
|
if (ret)
|
|
atomic64_inc(&fs_info->dev_replace.num_write_errors);
|
|
}
|
|
}
|
|
|
|
static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
|
|
int page_num)
|
|
{
|
|
struct scrub_page *spage = sblock->pagev[page_num];
|
|
|
|
BUG_ON(spage->page == NULL);
|
|
if (spage->io_error) {
|
|
void *mapped_buffer = kmap_atomic(spage->page);
|
|
|
|
clear_page(mapped_buffer);
|
|
flush_dcache_page(spage->page);
|
|
kunmap_atomic(mapped_buffer);
|
|
}
|
|
return scrub_add_page_to_wr_bio(sblock->sctx, spage);
|
|
}
|
|
|
|
static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
|
|
struct scrub_page *spage)
|
|
{
|
|
struct scrub_bio *sbio;
|
|
int ret;
|
|
|
|
mutex_lock(&sctx->wr_lock);
|
|
again:
|
|
if (!sctx->wr_curr_bio) {
|
|
sctx->wr_curr_bio = kzalloc(sizeof(*sctx->wr_curr_bio),
|
|
GFP_KERNEL);
|
|
if (!sctx->wr_curr_bio) {
|
|
mutex_unlock(&sctx->wr_lock);
|
|
return -ENOMEM;
|
|
}
|
|
sctx->wr_curr_bio->sctx = sctx;
|
|
sctx->wr_curr_bio->page_count = 0;
|
|
}
|
|
sbio = sctx->wr_curr_bio;
|
|
if (sbio->page_count == 0) {
|
|
struct bio *bio;
|
|
|
|
sbio->physical = spage->physical_for_dev_replace;
|
|
sbio->logical = spage->logical;
|
|
sbio->dev = sctx->wr_tgtdev;
|
|
bio = sbio->bio;
|
|
if (!bio) {
|
|
bio = btrfs_io_bio_alloc(sctx->pages_per_wr_bio);
|
|
sbio->bio = bio;
|
|
}
|
|
|
|
bio->bi_private = sbio;
|
|
bio->bi_end_io = scrub_wr_bio_end_io;
|
|
bio_set_dev(bio, sbio->dev->bdev);
|
|
bio->bi_iter.bi_sector = sbio->physical >> 9;
|
|
bio->bi_opf = REQ_OP_WRITE;
|
|
sbio->status = 0;
|
|
} else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
|
|
spage->physical_for_dev_replace ||
|
|
sbio->logical + sbio->page_count * PAGE_SIZE !=
|
|
spage->logical) {
|
|
scrub_wr_submit(sctx);
|
|
goto again;
|
|
}
|
|
|
|
ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
|
|
if (ret != PAGE_SIZE) {
|
|
if (sbio->page_count < 1) {
|
|
bio_put(sbio->bio);
|
|
sbio->bio = NULL;
|
|
mutex_unlock(&sctx->wr_lock);
|
|
return -EIO;
|
|
}
|
|
scrub_wr_submit(sctx);
|
|
goto again;
|
|
}
|
|
|
|
sbio->pagev[sbio->page_count] = spage;
|
|
scrub_page_get(spage);
|
|
sbio->page_count++;
|
|
if (sbio->page_count == sctx->pages_per_wr_bio)
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_wr_submit(struct scrub_ctx *sctx)
|
|
{
|
|
struct scrub_bio *sbio;
|
|
|
|
if (!sctx->wr_curr_bio)
|
|
return;
|
|
|
|
sbio = sctx->wr_curr_bio;
|
|
sctx->wr_curr_bio = NULL;
|
|
WARN_ON(!sbio->bio->bi_disk);
|
|
scrub_pending_bio_inc(sctx);
|
|
/* process all writes in a single worker thread. Then the block layer
|
|
* orders the requests before sending them to the driver which
|
|
* doubled the write performance on spinning disks when measured
|
|
* with Linux 3.5 */
|
|
btrfsic_submit_bio(sbio->bio);
|
|
}
|
|
|
|
static void scrub_wr_bio_end_io(struct bio *bio)
|
|
{
|
|
struct scrub_bio *sbio = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info = sbio->dev->fs_info;
|
|
|
|
sbio->status = bio->bi_status;
|
|
sbio->bio = bio;
|
|
|
|
btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper,
|
|
scrub_wr_bio_end_io_worker, NULL, NULL);
|
|
btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
|
|
}
|
|
|
|
static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
|
|
{
|
|
struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
|
|
struct scrub_ctx *sctx = sbio->sctx;
|
|
int i;
|
|
|
|
WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
|
|
if (sbio->status) {
|
|
struct btrfs_dev_replace *dev_replace =
|
|
&sbio->sctx->fs_info->dev_replace;
|
|
|
|
for (i = 0; i < sbio->page_count; i++) {
|
|
struct scrub_page *spage = sbio->pagev[i];
|
|
|
|
spage->io_error = 1;
|
|
atomic64_inc(&dev_replace->num_write_errors);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < sbio->page_count; i++)
|
|
scrub_page_put(sbio->pagev[i]);
|
|
|
|
bio_put(sbio->bio);
|
|
kfree(sbio);
|
|
scrub_pending_bio_dec(sctx);
|
|
}
|
|
|
|
static int scrub_checksum(struct scrub_block *sblock)
|
|
{
|
|
u64 flags;
|
|
int ret;
|
|
|
|
/*
|
|
* No need to initialize these stats currently,
|
|
* because this function only use return value
|
|
* instead of these stats value.
|
|
*
|
|
* Todo:
|
|
* always use stats
|
|
*/
|
|
sblock->header_error = 0;
|
|
sblock->generation_error = 0;
|
|
sblock->checksum_error = 0;
|
|
|
|
WARN_ON(sblock->page_count < 1);
|
|
flags = sblock->pagev[0]->flags;
|
|
ret = 0;
|
|
if (flags & BTRFS_EXTENT_FLAG_DATA)
|
|
ret = scrub_checksum_data(sblock);
|
|
else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
|
|
ret = scrub_checksum_tree_block(sblock);
|
|
else if (flags & BTRFS_EXTENT_FLAG_SUPER)
|
|
(void)scrub_checksum_super(sblock);
|
|
else
|
|
WARN_ON(1);
|
|
if (ret)
|
|
scrub_handle_errored_block(sblock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int scrub_checksum_data(struct scrub_block *sblock)
|
|
{
|
|
struct scrub_ctx *sctx = sblock->sctx;
|
|
u8 csum[BTRFS_CSUM_SIZE];
|
|
u8 *on_disk_csum;
|
|
struct page *page;
|
|
void *buffer;
|
|
u32 crc = ~(u32)0;
|
|
u64 len;
|
|
int index;
|
|
|
|
BUG_ON(sblock->page_count < 1);
|
|
if (!sblock->pagev[0]->have_csum)
|
|
return 0;
|
|
|
|
on_disk_csum = sblock->pagev[0]->csum;
|
|
page = sblock->pagev[0]->page;
|
|
buffer = kmap_atomic(page);
|
|
|
|
len = sctx->fs_info->sectorsize;
|
|
index = 0;
|
|
for (;;) {
|
|
u64 l = min_t(u64, len, PAGE_SIZE);
|
|
|
|
crc = btrfs_csum_data(buffer, crc, l);
|
|
kunmap_atomic(buffer);
|
|
len -= l;
|
|
if (len == 0)
|
|
break;
|
|
index++;
|
|
BUG_ON(index >= sblock->page_count);
|
|
BUG_ON(!sblock->pagev[index]->page);
|
|
page = sblock->pagev[index]->page;
|
|
buffer = kmap_atomic(page);
|
|
}
|
|
|
|
btrfs_csum_final(crc, csum);
|
|
if (memcmp(csum, on_disk_csum, sctx->csum_size))
|
|
sblock->checksum_error = 1;
|
|
|
|
return sblock->checksum_error;
|
|
}
|
|
|
|
static int scrub_checksum_tree_block(struct scrub_block *sblock)
|
|
{
|
|
struct scrub_ctx *sctx = sblock->sctx;
|
|
struct btrfs_header *h;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
u8 calculated_csum[BTRFS_CSUM_SIZE];
|
|
u8 on_disk_csum[BTRFS_CSUM_SIZE];
|
|
struct page *page;
|
|
void *mapped_buffer;
|
|
u64 mapped_size;
|
|
void *p;
|
|
u32 crc = ~(u32)0;
|
|
u64 len;
|
|
int index;
|
|
|
|
BUG_ON(sblock->page_count < 1);
|
|
page = sblock->pagev[0]->page;
|
|
mapped_buffer = kmap_atomic(page);
|
|
h = (struct btrfs_header *)mapped_buffer;
|
|
memcpy(on_disk_csum, h->csum, sctx->csum_size);
|
|
|
|
/*
|
|
* we don't use the getter functions here, as we
|
|
* a) don't have an extent buffer and
|
|
* b) the page is already kmapped
|
|
*/
|
|
if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h))
|
|
sblock->header_error = 1;
|
|
|
|
if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) {
|
|
sblock->header_error = 1;
|
|
sblock->generation_error = 1;
|
|
}
|
|
|
|
if (!scrub_check_fsid(h->fsid, sblock->pagev[0]))
|
|
sblock->header_error = 1;
|
|
|
|
if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
|
|
BTRFS_UUID_SIZE))
|
|
sblock->header_error = 1;
|
|
|
|
len = sctx->fs_info->nodesize - BTRFS_CSUM_SIZE;
|
|
mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
|
|
p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
|
|
index = 0;
|
|
for (;;) {
|
|
u64 l = min_t(u64, len, mapped_size);
|
|
|
|
crc = btrfs_csum_data(p, crc, l);
|
|
kunmap_atomic(mapped_buffer);
|
|
len -= l;
|
|
if (len == 0)
|
|
break;
|
|
index++;
|
|
BUG_ON(index >= sblock->page_count);
|
|
BUG_ON(!sblock->pagev[index]->page);
|
|
page = sblock->pagev[index]->page;
|
|
mapped_buffer = kmap_atomic(page);
|
|
mapped_size = PAGE_SIZE;
|
|
p = mapped_buffer;
|
|
}
|
|
|
|
btrfs_csum_final(crc, calculated_csum);
|
|
if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
|
|
sblock->checksum_error = 1;
|
|
|
|
return sblock->header_error || sblock->checksum_error;
|
|
}
|
|
|
|
static int scrub_checksum_super(struct scrub_block *sblock)
|
|
{
|
|
struct btrfs_super_block *s;
|
|
struct scrub_ctx *sctx = sblock->sctx;
|
|
u8 calculated_csum[BTRFS_CSUM_SIZE];
|
|
u8 on_disk_csum[BTRFS_CSUM_SIZE];
|
|
struct page *page;
|
|
void *mapped_buffer;
|
|
u64 mapped_size;
|
|
void *p;
|
|
u32 crc = ~(u32)0;
|
|
int fail_gen = 0;
|
|
int fail_cor = 0;
|
|
u64 len;
|
|
int index;
|
|
|
|
BUG_ON(sblock->page_count < 1);
|
|
page = sblock->pagev[0]->page;
|
|
mapped_buffer = kmap_atomic(page);
|
|
s = (struct btrfs_super_block *)mapped_buffer;
|
|
memcpy(on_disk_csum, s->csum, sctx->csum_size);
|
|
|
|
if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
|
|
++fail_cor;
|
|
|
|
if (sblock->pagev[0]->generation != btrfs_super_generation(s))
|
|
++fail_gen;
|
|
|
|
if (!scrub_check_fsid(s->fsid, sblock->pagev[0]))
|
|
++fail_cor;
|
|
|
|
len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
|
|
mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
|
|
p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
|
|
index = 0;
|
|
for (;;) {
|
|
u64 l = min_t(u64, len, mapped_size);
|
|
|
|
crc = btrfs_csum_data(p, crc, l);
|
|
kunmap_atomic(mapped_buffer);
|
|
len -= l;
|
|
if (len == 0)
|
|
break;
|
|
index++;
|
|
BUG_ON(index >= sblock->page_count);
|
|
BUG_ON(!sblock->pagev[index]->page);
|
|
page = sblock->pagev[index]->page;
|
|
mapped_buffer = kmap_atomic(page);
|
|
mapped_size = PAGE_SIZE;
|
|
p = mapped_buffer;
|
|
}
|
|
|
|
btrfs_csum_final(crc, calculated_csum);
|
|
if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
|
|
++fail_cor;
|
|
|
|
if (fail_cor + fail_gen) {
|
|
/*
|
|
* 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(&sctx->stat_lock);
|
|
++sctx->stat.super_errors;
|
|
spin_unlock(&sctx->stat_lock);
|
|
if (fail_cor)
|
|
btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
|
|
BTRFS_DEV_STAT_CORRUPTION_ERRS);
|
|
else
|
|
btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
|
|
BTRFS_DEV_STAT_GENERATION_ERRS);
|
|
}
|
|
|
|
return fail_cor + fail_gen;
|
|
}
|
|
|
|
static void scrub_block_get(struct scrub_block *sblock)
|
|
{
|
|
refcount_inc(&sblock->refs);
|
|
}
|
|
|
|
static void scrub_block_put(struct scrub_block *sblock)
|
|
{
|
|
if (refcount_dec_and_test(&sblock->refs)) {
|
|
int i;
|
|
|
|
if (sblock->sparity)
|
|
scrub_parity_put(sblock->sparity);
|
|
|
|
for (i = 0; i < sblock->page_count; i++)
|
|
scrub_page_put(sblock->pagev[i]);
|
|
kfree(sblock);
|
|
}
|
|
}
|
|
|
|
static void scrub_page_get(struct scrub_page *spage)
|
|
{
|
|
atomic_inc(&spage->refs);
|
|
}
|
|
|
|
static void scrub_page_put(struct scrub_page *spage)
|
|
{
|
|
if (atomic_dec_and_test(&spage->refs)) {
|
|
if (spage->page)
|
|
__free_page(spage->page);
|
|
kfree(spage);
|
|
}
|
|
}
|
|
|
|
static void scrub_submit(struct scrub_ctx *sctx)
|
|
{
|
|
struct scrub_bio *sbio;
|
|
|
|
if (sctx->curr == -1)
|
|
return;
|
|
|
|
sbio = sctx->bios[sctx->curr];
|
|
sctx->curr = -1;
|
|
scrub_pending_bio_inc(sctx);
|
|
btrfsic_submit_bio(sbio->bio);
|
|
}
|
|
|
|
static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
|
|
struct scrub_page *spage)
|
|
{
|
|
struct scrub_block *sblock = spage->sblock;
|
|
struct scrub_bio *sbio;
|
|
int ret;
|
|
|
|
again:
|
|
/*
|
|
* grab a fresh bio or wait for one to become available
|
|
*/
|
|
while (sctx->curr == -1) {
|
|
spin_lock(&sctx->list_lock);
|
|
sctx->curr = sctx->first_free;
|
|
if (sctx->curr != -1) {
|
|
sctx->first_free = sctx->bios[sctx->curr]->next_free;
|
|
sctx->bios[sctx->curr]->next_free = -1;
|
|
sctx->bios[sctx->curr]->page_count = 0;
|
|
spin_unlock(&sctx->list_lock);
|
|
} else {
|
|
spin_unlock(&sctx->list_lock);
|
|
wait_event(sctx->list_wait, sctx->first_free != -1);
|
|
}
|
|
}
|
|
sbio = sctx->bios[sctx->curr];
|
|
if (sbio->page_count == 0) {
|
|
struct bio *bio;
|
|
|
|
sbio->physical = spage->physical;
|
|
sbio->logical = spage->logical;
|
|
sbio->dev = spage->dev;
|
|
bio = sbio->bio;
|
|
if (!bio) {
|
|
bio = btrfs_io_bio_alloc(sctx->pages_per_rd_bio);
|
|
sbio->bio = bio;
|
|
}
|
|
|
|
bio->bi_private = sbio;
|
|
bio->bi_end_io = scrub_bio_end_io;
|
|
bio_set_dev(bio, sbio->dev->bdev);
|
|
bio->bi_iter.bi_sector = sbio->physical >> 9;
|
|
bio->bi_opf = REQ_OP_READ;
|
|
sbio->status = 0;
|
|
} else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
|
|
spage->physical ||
|
|
sbio->logical + sbio->page_count * PAGE_SIZE !=
|
|
spage->logical ||
|
|
sbio->dev != spage->dev) {
|
|
scrub_submit(sctx);
|
|
goto again;
|
|
}
|
|
|
|
sbio->pagev[sbio->page_count] = spage;
|
|
ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
|
|
if (ret != PAGE_SIZE) {
|
|
if (sbio->page_count < 1) {
|
|
bio_put(sbio->bio);
|
|
sbio->bio = NULL;
|
|
return -EIO;
|
|
}
|
|
scrub_submit(sctx);
|
|
goto again;
|
|
}
|
|
|
|
scrub_block_get(sblock); /* one for the page added to the bio */
|
|
atomic_inc(&sblock->outstanding_pages);
|
|
sbio->page_count++;
|
|
if (sbio->page_count == sctx->pages_per_rd_bio)
|
|
scrub_submit(sctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_missing_raid56_end_io(struct bio *bio)
|
|
{
|
|
struct scrub_block *sblock = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info = sblock->sctx->fs_info;
|
|
|
|
if (bio->bi_status)
|
|
sblock->no_io_error_seen = 0;
|
|
|
|
bio_put(bio);
|
|
|
|
btrfs_queue_work(fs_info->scrub_workers, &sblock->work);
|
|
}
|
|
|
|
static void scrub_missing_raid56_worker(struct btrfs_work *work)
|
|
{
|
|
struct scrub_block *sblock = container_of(work, struct scrub_block, work);
|
|
struct scrub_ctx *sctx = sblock->sctx;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
u64 logical;
|
|
struct btrfs_device *dev;
|
|
|
|
logical = sblock->pagev[0]->logical;
|
|
dev = sblock->pagev[0]->dev;
|
|
|
|
if (sblock->no_io_error_seen)
|
|
scrub_recheck_block_checksum(sblock);
|
|
|
|
if (!sblock->no_io_error_seen) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.read_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_err_rl_in_rcu(fs_info,
|
|
"IO error rebuilding logical %llu for dev %s",
|
|
logical, rcu_str_deref(dev->name));
|
|
} else if (sblock->header_error || sblock->checksum_error) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_err_rl_in_rcu(fs_info,
|
|
"failed to rebuild valid logical %llu for dev %s",
|
|
logical, rcu_str_deref(dev->name));
|
|
} else {
|
|
scrub_write_block_to_dev_replace(sblock);
|
|
}
|
|
|
|
scrub_block_put(sblock);
|
|
|
|
if (sctx->is_dev_replace && sctx->flush_all_writes) {
|
|
mutex_lock(&sctx->wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
}
|
|
|
|
scrub_pending_bio_dec(sctx);
|
|
}
|
|
|
|
static void scrub_missing_raid56_pages(struct scrub_block *sblock)
|
|
{
|
|
struct scrub_ctx *sctx = sblock->sctx;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
u64 length = sblock->page_count * PAGE_SIZE;
|
|
u64 logical = sblock->pagev[0]->logical;
|
|
struct btrfs_bio *bbio = NULL;
|
|
struct bio *bio;
|
|
struct btrfs_raid_bio *rbio;
|
|
int ret;
|
|
int i;
|
|
|
|
btrfs_bio_counter_inc_blocked(fs_info);
|
|
ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
|
|
&length, &bbio);
|
|
if (ret || !bbio || !bbio->raid_map)
|
|
goto bbio_out;
|
|
|
|
if (WARN_ON(!sctx->is_dev_replace ||
|
|
!(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) {
|
|
/*
|
|
* We shouldn't be scrubbing a missing device. Even for dev
|
|
* replace, we should only get here for RAID 5/6. We either
|
|
* managed to mount something with no mirrors remaining or
|
|
* there's a bug in scrub_remap_extent()/btrfs_map_block().
|
|
*/
|
|
goto bbio_out;
|
|
}
|
|
|
|
bio = btrfs_io_bio_alloc(0);
|
|
bio->bi_iter.bi_sector = logical >> 9;
|
|
bio->bi_private = sblock;
|
|
bio->bi_end_io = scrub_missing_raid56_end_io;
|
|
|
|
rbio = raid56_alloc_missing_rbio(fs_info, bio, bbio, length);
|
|
if (!rbio)
|
|
goto rbio_out;
|
|
|
|
for (i = 0; i < sblock->page_count; i++) {
|
|
struct scrub_page *spage = sblock->pagev[i];
|
|
|
|
raid56_add_scrub_pages(rbio, spage->page, spage->logical);
|
|
}
|
|
|
|
btrfs_init_work(&sblock->work, btrfs_scrub_helper,
|
|
scrub_missing_raid56_worker, NULL, NULL);
|
|
scrub_block_get(sblock);
|
|
scrub_pending_bio_inc(sctx);
|
|
raid56_submit_missing_rbio(rbio);
|
|
return;
|
|
|
|
rbio_out:
|
|
bio_put(bio);
|
|
bbio_out:
|
|
btrfs_bio_counter_dec(fs_info);
|
|
btrfs_put_bbio(bbio);
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
}
|
|
|
|
static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
|
|
u64 physical, struct btrfs_device *dev, u64 flags,
|
|
u64 gen, int mirror_num, u8 *csum, int force,
|
|
u64 physical_for_dev_replace)
|
|
{
|
|
struct scrub_block *sblock;
|
|
int index;
|
|
|
|
sblock = kzalloc(sizeof(*sblock), GFP_KERNEL);
|
|
if (!sblock) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* one ref inside this function, plus one for each page added to
|
|
* a bio later on */
|
|
refcount_set(&sblock->refs, 1);
|
|
sblock->sctx = sctx;
|
|
sblock->no_io_error_seen = 1;
|
|
|
|
for (index = 0; len > 0; index++) {
|
|
struct scrub_page *spage;
|
|
u64 l = min_t(u64, len, PAGE_SIZE);
|
|
|
|
spage = kzalloc(sizeof(*spage), GFP_KERNEL);
|
|
if (!spage) {
|
|
leave_nomem:
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
scrub_block_put(sblock);
|
|
return -ENOMEM;
|
|
}
|
|
BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
|
|
scrub_page_get(spage);
|
|
sblock->pagev[index] = spage;
|
|
spage->sblock = sblock;
|
|
spage->dev = dev;
|
|
spage->flags = flags;
|
|
spage->generation = gen;
|
|
spage->logical = logical;
|
|
spage->physical = physical;
|
|
spage->physical_for_dev_replace = physical_for_dev_replace;
|
|
spage->mirror_num = mirror_num;
|
|
if (csum) {
|
|
spage->have_csum = 1;
|
|
memcpy(spage->csum, csum, sctx->csum_size);
|
|
} else {
|
|
spage->have_csum = 0;
|
|
}
|
|
sblock->page_count++;
|
|
spage->page = alloc_page(GFP_KERNEL);
|
|
if (!spage->page)
|
|
goto leave_nomem;
|
|
len -= l;
|
|
logical += l;
|
|
physical += l;
|
|
physical_for_dev_replace += l;
|
|
}
|
|
|
|
WARN_ON(sblock->page_count == 0);
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) {
|
|
/*
|
|
* This case should only be hit for RAID 5/6 device replace. See
|
|
* the comment in scrub_missing_raid56_pages() for details.
|
|
*/
|
|
scrub_missing_raid56_pages(sblock);
|
|
} else {
|
|
for (index = 0; index < sblock->page_count; index++) {
|
|
struct scrub_page *spage = sblock->pagev[index];
|
|
int ret;
|
|
|
|
ret = scrub_add_page_to_rd_bio(sctx, spage);
|
|
if (ret) {
|
|
scrub_block_put(sblock);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (force)
|
|
scrub_submit(sctx);
|
|
}
|
|
|
|
/* last one frees, either here or in bio completion for last page */
|
|
scrub_block_put(sblock);
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_bio_end_io(struct bio *bio)
|
|
{
|
|
struct scrub_bio *sbio = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info = sbio->dev->fs_info;
|
|
|
|
sbio->status = bio->bi_status;
|
|
sbio->bio = bio;
|
|
|
|
btrfs_queue_work(fs_info->scrub_workers, &sbio->work);
|
|
}
|
|
|
|
static void scrub_bio_end_io_worker(struct btrfs_work *work)
|
|
{
|
|
struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
|
|
struct scrub_ctx *sctx = sbio->sctx;
|
|
int i;
|
|
|
|
BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
|
|
if (sbio->status) {
|
|
for (i = 0; i < sbio->page_count; i++) {
|
|
struct scrub_page *spage = sbio->pagev[i];
|
|
|
|
spage->io_error = 1;
|
|
spage->sblock->no_io_error_seen = 0;
|
|
}
|
|
}
|
|
|
|
/* now complete the scrub_block items that have all pages completed */
|
|
for (i = 0; i < sbio->page_count; i++) {
|
|
struct scrub_page *spage = sbio->pagev[i];
|
|
struct scrub_block *sblock = spage->sblock;
|
|
|
|
if (atomic_dec_and_test(&sblock->outstanding_pages))
|
|
scrub_block_complete(sblock);
|
|
scrub_block_put(sblock);
|
|
}
|
|
|
|
bio_put(sbio->bio);
|
|
sbio->bio = NULL;
|
|
spin_lock(&sctx->list_lock);
|
|
sbio->next_free = sctx->first_free;
|
|
sctx->first_free = sbio->index;
|
|
spin_unlock(&sctx->list_lock);
|
|
|
|
if (sctx->is_dev_replace && sctx->flush_all_writes) {
|
|
mutex_lock(&sctx->wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
}
|
|
|
|
scrub_pending_bio_dec(sctx);
|
|
}
|
|
|
|
static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
|
|
unsigned long *bitmap,
|
|
u64 start, u64 len)
|
|
{
|
|
u64 offset;
|
|
u64 nsectors64;
|
|
u32 nsectors;
|
|
int sectorsize = sparity->sctx->fs_info->sectorsize;
|
|
|
|
if (len >= sparity->stripe_len) {
|
|
bitmap_set(bitmap, 0, sparity->nsectors);
|
|
return;
|
|
}
|
|
|
|
start -= sparity->logic_start;
|
|
start = div64_u64_rem(start, sparity->stripe_len, &offset);
|
|
offset = div_u64(offset, sectorsize);
|
|
nsectors64 = div_u64(len, sectorsize);
|
|
|
|
ASSERT(nsectors64 < UINT_MAX);
|
|
nsectors = (u32)nsectors64;
|
|
|
|
if (offset + nsectors <= sparity->nsectors) {
|
|
bitmap_set(bitmap, offset, nsectors);
|
|
return;
|
|
}
|
|
|
|
bitmap_set(bitmap, offset, sparity->nsectors - offset);
|
|
bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset));
|
|
}
|
|
|
|
static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity,
|
|
u64 start, u64 len)
|
|
{
|
|
__scrub_mark_bitmap(sparity, sparity->ebitmap, start, len);
|
|
}
|
|
|
|
static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity,
|
|
u64 start, u64 len)
|
|
{
|
|
__scrub_mark_bitmap(sparity, sparity->dbitmap, start, len);
|
|
}
|
|
|
|
static void scrub_block_complete(struct scrub_block *sblock)
|
|
{
|
|
int corrupted = 0;
|
|
|
|
if (!sblock->no_io_error_seen) {
|
|
corrupted = 1;
|
|
scrub_handle_errored_block(sblock);
|
|
} else {
|
|
/*
|
|
* if has checksum error, write via repair mechanism in
|
|
* dev replace case, otherwise write here in dev replace
|
|
* case.
|
|
*/
|
|
corrupted = scrub_checksum(sblock);
|
|
if (!corrupted && sblock->sctx->is_dev_replace)
|
|
scrub_write_block_to_dev_replace(sblock);
|
|
}
|
|
|
|
if (sblock->sparity && corrupted && !sblock->data_corrected) {
|
|
u64 start = sblock->pagev[0]->logical;
|
|
u64 end = sblock->pagev[sblock->page_count - 1]->logical +
|
|
PAGE_SIZE;
|
|
|
|
scrub_parity_mark_sectors_error(sblock->sparity,
|
|
start, end - start);
|
|
}
|
|
}
|
|
|
|
static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum)
|
|
{
|
|
struct btrfs_ordered_sum *sum = NULL;
|
|
unsigned long index;
|
|
unsigned long num_sectors;
|
|
|
|
while (!list_empty(&sctx->csum_list)) {
|
|
sum = list_first_entry(&sctx->csum_list,
|
|
struct btrfs_ordered_sum, list);
|
|
if (sum->bytenr > logical)
|
|
return 0;
|
|
if (sum->bytenr + sum->len > logical)
|
|
break;
|
|
|
|
++sctx->stat.csum_discards;
|
|
list_del(&sum->list);
|
|
kfree(sum);
|
|
sum = NULL;
|
|
}
|
|
if (!sum)
|
|
return 0;
|
|
|
|
index = div_u64(logical - sum->bytenr, sctx->fs_info->sectorsize);
|
|
ASSERT(index < UINT_MAX);
|
|
|
|
num_sectors = sum->len / sctx->fs_info->sectorsize;
|
|
memcpy(csum, sum->sums + index, sctx->csum_size);
|
|
if (index == num_sectors - 1) {
|
|
list_del(&sum->list);
|
|
kfree(sum);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* scrub extent tries to collect up to 64 kB for each bio */
|
|
static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map,
|
|
u64 logical, u64 len,
|
|
u64 physical, struct btrfs_device *dev, u64 flags,
|
|
u64 gen, int mirror_num, u64 physical_for_dev_replace)
|
|
{
|
|
int ret;
|
|
u8 csum[BTRFS_CSUM_SIZE];
|
|
u32 blocksize;
|
|
|
|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
|
|
blocksize = map->stripe_len;
|
|
else
|
|
blocksize = sctx->fs_info->sectorsize;
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.data_extents_scrubbed++;
|
|
sctx->stat.data_bytes_scrubbed += len;
|
|
spin_unlock(&sctx->stat_lock);
|
|
} else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
|
|
blocksize = map->stripe_len;
|
|
else
|
|
blocksize = sctx->fs_info->nodesize;
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.tree_extents_scrubbed++;
|
|
sctx->stat.tree_bytes_scrubbed += len;
|
|
spin_unlock(&sctx->stat_lock);
|
|
} else {
|
|
blocksize = sctx->fs_info->sectorsize;
|
|
WARN_ON(1);
|
|
}
|
|
|
|
while (len) {
|
|
u64 l = min_t(u64, len, blocksize);
|
|
int have_csum = 0;
|
|
|
|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
|
/* push csums to sbio */
|
|
have_csum = scrub_find_csum(sctx, logical, csum);
|
|
if (have_csum == 0)
|
|
++sctx->stat.no_csum;
|
|
}
|
|
ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
|
|
mirror_num, have_csum ? csum : NULL, 0,
|
|
physical_for_dev_replace);
|
|
if (ret)
|
|
return ret;
|
|
len -= l;
|
|
logical += l;
|
|
physical += l;
|
|
physical_for_dev_replace += l;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int scrub_pages_for_parity(struct scrub_parity *sparity,
|
|
u64 logical, u64 len,
|
|
u64 physical, struct btrfs_device *dev,
|
|
u64 flags, u64 gen, int mirror_num, u8 *csum)
|
|
{
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
struct scrub_block *sblock;
|
|
int index;
|
|
|
|
sblock = kzalloc(sizeof(*sblock), GFP_KERNEL);
|
|
if (!sblock) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* one ref inside this function, plus one for each page added to
|
|
* a bio later on */
|
|
refcount_set(&sblock->refs, 1);
|
|
sblock->sctx = sctx;
|
|
sblock->no_io_error_seen = 1;
|
|
sblock->sparity = sparity;
|
|
scrub_parity_get(sparity);
|
|
|
|
for (index = 0; len > 0; index++) {
|
|
struct scrub_page *spage;
|
|
u64 l = min_t(u64, len, PAGE_SIZE);
|
|
|
|
spage = kzalloc(sizeof(*spage), GFP_KERNEL);
|
|
if (!spage) {
|
|
leave_nomem:
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
scrub_block_put(sblock);
|
|
return -ENOMEM;
|
|
}
|
|
BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
|
|
/* For scrub block */
|
|
scrub_page_get(spage);
|
|
sblock->pagev[index] = spage;
|
|
/* For scrub parity */
|
|
scrub_page_get(spage);
|
|
list_add_tail(&spage->list, &sparity->spages);
|
|
spage->sblock = sblock;
|
|
spage->dev = dev;
|
|
spage->flags = flags;
|
|
spage->generation = gen;
|
|
spage->logical = logical;
|
|
spage->physical = physical;
|
|
spage->mirror_num = mirror_num;
|
|
if (csum) {
|
|
spage->have_csum = 1;
|
|
memcpy(spage->csum, csum, sctx->csum_size);
|
|
} else {
|
|
spage->have_csum = 0;
|
|
}
|
|
sblock->page_count++;
|
|
spage->page = alloc_page(GFP_KERNEL);
|
|
if (!spage->page)
|
|
goto leave_nomem;
|
|
len -= l;
|
|
logical += l;
|
|
physical += l;
|
|
}
|
|
|
|
WARN_ON(sblock->page_count == 0);
|
|
for (index = 0; index < sblock->page_count; index++) {
|
|
struct scrub_page *spage = sblock->pagev[index];
|
|
int ret;
|
|
|
|
ret = scrub_add_page_to_rd_bio(sctx, spage);
|
|
if (ret) {
|
|
scrub_block_put(sblock);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* last one frees, either here or in bio completion for last page */
|
|
scrub_block_put(sblock);
|
|
return 0;
|
|
}
|
|
|
|
static int scrub_extent_for_parity(struct scrub_parity *sparity,
|
|
u64 logical, u64 len,
|
|
u64 physical, struct btrfs_device *dev,
|
|
u64 flags, u64 gen, int mirror_num)
|
|
{
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
int ret;
|
|
u8 csum[BTRFS_CSUM_SIZE];
|
|
u32 blocksize;
|
|
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) {
|
|
scrub_parity_mark_sectors_error(sparity, logical, len);
|
|
return 0;
|
|
}
|
|
|
|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
|
blocksize = sparity->stripe_len;
|
|
} else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
|
blocksize = sparity->stripe_len;
|
|
} else {
|
|
blocksize = sctx->fs_info->sectorsize;
|
|
WARN_ON(1);
|
|
}
|
|
|
|
while (len) {
|
|
u64 l = min_t(u64, len, blocksize);
|
|
int have_csum = 0;
|
|
|
|
if (flags & BTRFS_EXTENT_FLAG_DATA) {
|
|
/* push csums to sbio */
|
|
have_csum = scrub_find_csum(sctx, logical, csum);
|
|
if (have_csum == 0)
|
|
goto skip;
|
|
}
|
|
ret = scrub_pages_for_parity(sparity, logical, l, physical, dev,
|
|
flags, gen, mirror_num,
|
|
have_csum ? csum : NULL);
|
|
if (ret)
|
|
return ret;
|
|
skip:
|
|
len -= l;
|
|
logical += l;
|
|
physical += l;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Given a physical address, this will calculate it's
|
|
* logical offset. if this is a parity stripe, it will return
|
|
* the most left data stripe's logical offset.
|
|
*
|
|
* return 0 if it is a data stripe, 1 means parity stripe.
|
|
*/
|
|
static int get_raid56_logic_offset(u64 physical, int num,
|
|
struct map_lookup *map, u64 *offset,
|
|
u64 *stripe_start)
|
|
{
|
|
int i;
|
|
int j = 0;
|
|
u64 stripe_nr;
|
|
u64 last_offset;
|
|
u32 stripe_index;
|
|
u32 rot;
|
|
|
|
last_offset = (physical - map->stripes[num].physical) *
|
|
nr_data_stripes(map);
|
|
if (stripe_start)
|
|
*stripe_start = last_offset;
|
|
|
|
*offset = last_offset;
|
|
for (i = 0; i < nr_data_stripes(map); i++) {
|
|
*offset = last_offset + i * map->stripe_len;
|
|
|
|
stripe_nr = div64_u64(*offset, map->stripe_len);
|
|
stripe_nr = div_u64(stripe_nr, nr_data_stripes(map));
|
|
|
|
/* Work out the disk rotation on this stripe-set */
|
|
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot);
|
|
/* calculate which stripe this data locates */
|
|
rot += i;
|
|
stripe_index = rot % map->num_stripes;
|
|
if (stripe_index == num)
|
|
return 0;
|
|
if (stripe_index < num)
|
|
j++;
|
|
}
|
|
*offset = last_offset + j * map->stripe_len;
|
|
return 1;
|
|
}
|
|
|
|
static void scrub_free_parity(struct scrub_parity *sparity)
|
|
{
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
struct scrub_page *curr, *next;
|
|
int nbits;
|
|
|
|
nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors);
|
|
if (nbits) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.read_errors += nbits;
|
|
sctx->stat.uncorrectable_errors += nbits;
|
|
spin_unlock(&sctx->stat_lock);
|
|
}
|
|
|
|
list_for_each_entry_safe(curr, next, &sparity->spages, list) {
|
|
list_del_init(&curr->list);
|
|
scrub_page_put(curr);
|
|
}
|
|
|
|
kfree(sparity);
|
|
}
|
|
|
|
static void scrub_parity_bio_endio_worker(struct btrfs_work *work)
|
|
{
|
|
struct scrub_parity *sparity = container_of(work, struct scrub_parity,
|
|
work);
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
|
|
scrub_free_parity(sparity);
|
|
scrub_pending_bio_dec(sctx);
|
|
}
|
|
|
|
static void scrub_parity_bio_endio(struct bio *bio)
|
|
{
|
|
struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private;
|
|
struct btrfs_fs_info *fs_info = sparity->sctx->fs_info;
|
|
|
|
if (bio->bi_status)
|
|
bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
|
|
sparity->nsectors);
|
|
|
|
bio_put(bio);
|
|
|
|
btrfs_init_work(&sparity->work, btrfs_scrubparity_helper,
|
|
scrub_parity_bio_endio_worker, NULL, NULL);
|
|
btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work);
|
|
}
|
|
|
|
static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
|
|
{
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
struct bio *bio;
|
|
struct btrfs_raid_bio *rbio;
|
|
struct btrfs_bio *bbio = NULL;
|
|
u64 length;
|
|
int ret;
|
|
|
|
if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap,
|
|
sparity->nsectors))
|
|
goto out;
|
|
|
|
length = sparity->logic_end - sparity->logic_start;
|
|
|
|
btrfs_bio_counter_inc_blocked(fs_info);
|
|
ret = btrfs_map_sblock(fs_info, BTRFS_MAP_WRITE, sparity->logic_start,
|
|
&length, &bbio);
|
|
if (ret || !bbio || !bbio->raid_map)
|
|
goto bbio_out;
|
|
|
|
bio = btrfs_io_bio_alloc(0);
|
|
bio->bi_iter.bi_sector = sparity->logic_start >> 9;
|
|
bio->bi_private = sparity;
|
|
bio->bi_end_io = scrub_parity_bio_endio;
|
|
|
|
rbio = raid56_parity_alloc_scrub_rbio(fs_info, bio, bbio,
|
|
length, sparity->scrub_dev,
|
|
sparity->dbitmap,
|
|
sparity->nsectors);
|
|
if (!rbio)
|
|
goto rbio_out;
|
|
|
|
scrub_pending_bio_inc(sctx);
|
|
raid56_parity_submit_scrub_rbio(rbio);
|
|
return;
|
|
|
|
rbio_out:
|
|
bio_put(bio);
|
|
bbio_out:
|
|
btrfs_bio_counter_dec(fs_info);
|
|
btrfs_put_bbio(bbio);
|
|
bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
|
|
sparity->nsectors);
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
out:
|
|
scrub_free_parity(sparity);
|
|
}
|
|
|
|
static inline int scrub_calc_parity_bitmap_len(int nsectors)
|
|
{
|
|
return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * sizeof(long);
|
|
}
|
|
|
|
static void scrub_parity_get(struct scrub_parity *sparity)
|
|
{
|
|
refcount_inc(&sparity->refs);
|
|
}
|
|
|
|
static void scrub_parity_put(struct scrub_parity *sparity)
|
|
{
|
|
if (!refcount_dec_and_test(&sparity->refs))
|
|
return;
|
|
|
|
scrub_parity_check_and_repair(sparity);
|
|
}
|
|
|
|
static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
|
|
struct map_lookup *map,
|
|
struct btrfs_device *sdev,
|
|
struct btrfs_path *path,
|
|
u64 logic_start,
|
|
u64 logic_end)
|
|
{
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_root *csum_root = fs_info->csum_root;
|
|
struct btrfs_extent_item *extent;
|
|
struct btrfs_bio *bbio = NULL;
|
|
u64 flags;
|
|
int ret;
|
|
int slot;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key key;
|
|
u64 generation;
|
|
u64 extent_logical;
|
|
u64 extent_physical;
|
|
u64 extent_len;
|
|
u64 mapped_length;
|
|
struct btrfs_device *extent_dev;
|
|
struct scrub_parity *sparity;
|
|
int nsectors;
|
|
int bitmap_len;
|
|
int extent_mirror_num;
|
|
int stop_loop = 0;
|
|
|
|
nsectors = div_u64(map->stripe_len, fs_info->sectorsize);
|
|
bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
|
|
sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len,
|
|
GFP_NOFS);
|
|
if (!sparity) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sparity->stripe_len = map->stripe_len;
|
|
sparity->nsectors = nsectors;
|
|
sparity->sctx = sctx;
|
|
sparity->scrub_dev = sdev;
|
|
sparity->logic_start = logic_start;
|
|
sparity->logic_end = logic_end;
|
|
refcount_set(&sparity->refs, 1);
|
|
INIT_LIST_HEAD(&sparity->spages);
|
|
sparity->dbitmap = sparity->bitmap;
|
|
sparity->ebitmap = (void *)sparity->bitmap + bitmap_len;
|
|
|
|
ret = 0;
|
|
while (logic_start < logic_end) {
|
|
if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
else
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.objectid = logic_start;
|
|
key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = btrfs_previous_extent_item(root, path, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0) {
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(NULL, root, &key,
|
|
path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
stop_loop = 0;
|
|
while (1) {
|
|
u64 bytes;
|
|
|
|
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;
|
|
|
|
stop_loop = 1;
|
|
break;
|
|
}
|
|
btrfs_item_key_to_cpu(l, &key, slot);
|
|
|
|
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
|
|
key.type != BTRFS_METADATA_ITEM_KEY)
|
|
goto next;
|
|
|
|
if (key.type == BTRFS_METADATA_ITEM_KEY)
|
|
bytes = fs_info->nodesize;
|
|
else
|
|
bytes = key.offset;
|
|
|
|
if (key.objectid + bytes <= logic_start)
|
|
goto next;
|
|
|
|
if (key.objectid >= logic_end) {
|
|
stop_loop = 1;
|
|
break;
|
|
}
|
|
|
|
while (key.objectid >= logic_start + map->stripe_len)
|
|
logic_start += map->stripe_len;
|
|
|
|
extent = btrfs_item_ptr(l, slot,
|
|
struct btrfs_extent_item);
|
|
flags = btrfs_extent_flags(l, extent);
|
|
generation = btrfs_extent_generation(l, extent);
|
|
|
|
if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
|
|
(key.objectid < logic_start ||
|
|
key.objectid + bytes >
|
|
logic_start + map->stripe_len)) {
|
|
btrfs_err(fs_info,
|
|
"scrub: tree block %llu spanning stripes, ignored. logical=%llu",
|
|
key.objectid, logic_start);
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
goto next;
|
|
}
|
|
again:
|
|
extent_logical = key.objectid;
|
|
extent_len = bytes;
|
|
|
|
if (extent_logical < logic_start) {
|
|
extent_len -= logic_start - extent_logical;
|
|
extent_logical = logic_start;
|
|
}
|
|
|
|
if (extent_logical + extent_len >
|
|
logic_start + map->stripe_len)
|
|
extent_len = logic_start + map->stripe_len -
|
|
extent_logical;
|
|
|
|
scrub_parity_mark_sectors_data(sparity, extent_logical,
|
|
extent_len);
|
|
|
|
mapped_length = extent_len;
|
|
bbio = NULL;
|
|
ret = btrfs_map_block(fs_info, BTRFS_MAP_READ,
|
|
extent_logical, &mapped_length, &bbio,
|
|
0);
|
|
if (!ret) {
|
|
if (!bbio || mapped_length < extent_len)
|
|
ret = -EIO;
|
|
}
|
|
if (ret) {
|
|
btrfs_put_bbio(bbio);
|
|
goto out;
|
|
}
|
|
extent_physical = bbio->stripes[0].physical;
|
|
extent_mirror_num = bbio->mirror_num;
|
|
extent_dev = bbio->stripes[0].dev;
|
|
btrfs_put_bbio(bbio);
|
|
|
|
ret = btrfs_lookup_csums_range(csum_root,
|
|
extent_logical,
|
|
extent_logical + extent_len - 1,
|
|
&sctx->csum_list, 1);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = scrub_extent_for_parity(sparity, extent_logical,
|
|
extent_len,
|
|
extent_physical,
|
|
extent_dev, flags,
|
|
generation,
|
|
extent_mirror_num);
|
|
|
|
scrub_free_csums(sctx);
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (extent_logical + extent_len <
|
|
key.objectid + bytes) {
|
|
logic_start += map->stripe_len;
|
|
|
|
if (logic_start >= logic_end) {
|
|
stop_loop = 1;
|
|
break;
|
|
}
|
|
|
|
if (logic_start < key.objectid + bytes) {
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
}
|
|
next:
|
|
path->slots[0]++;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
|
|
if (stop_loop)
|
|
break;
|
|
|
|
logic_start += map->stripe_len;
|
|
}
|
|
out:
|
|
if (ret < 0)
|
|
scrub_parity_mark_sectors_error(sparity, logic_start,
|
|
logic_end - logic_start);
|
|
scrub_parity_put(sparity);
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
|
|
btrfs_release_path(path);
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
|
|
struct map_lookup *map,
|
|
struct btrfs_device *scrub_dev,
|
|
int num, u64 base, u64 length)
|
|
{
|
|
struct btrfs_path *path, *ppath;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_root *csum_root = fs_info->csum_root;
|
|
struct btrfs_extent_item *extent;
|
|
struct blk_plug plug;
|
|
u64 flags;
|
|
int ret;
|
|
int slot;
|
|
u64 nstripes;
|
|
struct extent_buffer *l;
|
|
u64 physical;
|
|
u64 logical;
|
|
u64 logic_end;
|
|
u64 physical_end;
|
|
u64 generation;
|
|
int mirror_num;
|
|
struct reada_control *reada1;
|
|
struct reada_control *reada2;
|
|
struct btrfs_key key;
|
|
struct btrfs_key key_end;
|
|
u64 increment = map->stripe_len;
|
|
u64 offset;
|
|
u64 extent_logical;
|
|
u64 extent_physical;
|
|
u64 extent_len;
|
|
u64 stripe_logical;
|
|
u64 stripe_end;
|
|
struct btrfs_device *extent_dev;
|
|
int extent_mirror_num;
|
|
int stop_loop = 0;
|
|
|
|
physical = map->stripes[num].physical;
|
|
offset = 0;
|
|
nstripes = div64_u64(length, map->stripe_len);
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
|
|
offset = map->stripe_len * num;
|
|
increment = map->stripe_len * map->num_stripes;
|
|
mirror_num = 1;
|
|
} 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 + 1;
|
|
} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
|
|
increment = map->stripe_len;
|
|
mirror_num = num % map->num_stripes + 1;
|
|
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
|
|
increment = map->stripe_len;
|
|
mirror_num = num % map->num_stripes + 1;
|
|
} else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
|
|
get_raid56_logic_offset(physical, num, map, &offset, NULL);
|
|
increment = map->stripe_len * nr_data_stripes(map);
|
|
mirror_num = 1;
|
|
} else {
|
|
increment = map->stripe_len;
|
|
mirror_num = 1;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ppath = btrfs_alloc_path();
|
|
if (!ppath) {
|
|
btrfs_free_path(path);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* work on commit root. The related disk blocks are static as
|
|
* long as COW is applied. This means, it is save to rewrite
|
|
* them to repair disk errors without any race conditions
|
|
*/
|
|
path->search_commit_root = 1;
|
|
path->skip_locking = 1;
|
|
|
|
ppath->search_commit_root = 1;
|
|
ppath->skip_locking = 1;
|
|
/*
|
|
* trigger the readahead for extent tree csum tree and wait for
|
|
* completion. During readahead, the scrub is officially paused
|
|
* to not hold off transaction commits
|
|
*/
|
|
logical = base + offset;
|
|
physical_end = physical + nstripes * map->stripe_len;
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
|
|
get_raid56_logic_offset(physical_end, num,
|
|
map, &logic_end, NULL);
|
|
logic_end += base;
|
|
} else {
|
|
logic_end = logical + increment * nstripes;
|
|
}
|
|
wait_event(sctx->list_wait,
|
|
atomic_read(&sctx->bios_in_flight) == 0);
|
|
scrub_blocked_if_needed(fs_info);
|
|
|
|
/* FIXME it might be better to start readahead at commit root */
|
|
key.objectid = logical;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = (u64)0;
|
|
key_end.objectid = logic_end;
|
|
key_end.type = BTRFS_METADATA_ITEM_KEY;
|
|
key_end.offset = (u64)-1;
|
|
reada1 = btrfs_reada_add(root, &key, &key_end);
|
|
|
|
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key.type = BTRFS_EXTENT_CSUM_KEY;
|
|
key.offset = logical;
|
|
key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key_end.type = BTRFS_EXTENT_CSUM_KEY;
|
|
key_end.offset = logic_end;
|
|
reada2 = btrfs_reada_add(csum_root, &key, &key_end);
|
|
|
|
if (!IS_ERR(reada1))
|
|
btrfs_reada_wait(reada1);
|
|
if (!IS_ERR(reada2))
|
|
btrfs_reada_wait(reada2);
|
|
|
|
|
|
/*
|
|
* collect all data csums for the stripe to avoid seeking during
|
|
* the scrub. This might currently (crc32) end up to be about 1MB
|
|
*/
|
|
blk_start_plug(&plug);
|
|
|
|
/*
|
|
* now find all extents for each stripe and scrub them
|
|
*/
|
|
ret = 0;
|
|
while (physical < physical_end) {
|
|
/*
|
|
* canceled?
|
|
*/
|
|
if (atomic_read(&fs_info->scrub_cancel_req) ||
|
|
atomic_read(&sctx->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 */
|
|
sctx->flush_all_writes = true;
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
wait_event(sctx->list_wait,
|
|
atomic_read(&sctx->bios_in_flight) == 0);
|
|
sctx->flush_all_writes = false;
|
|
scrub_blocked_if_needed(fs_info);
|
|
}
|
|
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
|
|
ret = get_raid56_logic_offset(physical, num, map,
|
|
&logical,
|
|
&stripe_logical);
|
|
logical += base;
|
|
if (ret) {
|
|
/* it is parity strip */
|
|
stripe_logical += base;
|
|
stripe_end = stripe_logical + increment;
|
|
ret = scrub_raid56_parity(sctx, map, scrub_dev,
|
|
ppath, stripe_logical,
|
|
stripe_end);
|
|
if (ret)
|
|
goto out;
|
|
goto skip;
|
|
}
|
|
}
|
|
|
|
if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
else
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.objectid = logical;
|
|
key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = btrfs_previous_extent_item(root, path, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0) {
|
|
/* there's no smaller item, so stick with the
|
|
* larger one */
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(NULL, root, &key,
|
|
path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
stop_loop = 0;
|
|
while (1) {
|
|
u64 bytes;
|
|
|
|
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;
|
|
|
|
stop_loop = 1;
|
|
break;
|
|
}
|
|
btrfs_item_key_to_cpu(l, &key, slot);
|
|
|
|
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
|
|
key.type != BTRFS_METADATA_ITEM_KEY)
|
|
goto next;
|
|
|
|
if (key.type == BTRFS_METADATA_ITEM_KEY)
|
|
bytes = fs_info->nodesize;
|
|
else
|
|
bytes = key.offset;
|
|
|
|
if (key.objectid + bytes <= logical)
|
|
goto next;
|
|
|
|
if (key.objectid >= logical + map->stripe_len) {
|
|
/* out of this device extent */
|
|
if (key.objectid >= logic_end)
|
|
stop_loop = 1;
|
|
break;
|
|
}
|
|
|
|
extent = btrfs_item_ptr(l, slot,
|
|
struct btrfs_extent_item);
|
|
flags = btrfs_extent_flags(l, extent);
|
|
generation = btrfs_extent_generation(l, extent);
|
|
|
|
if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
|
|
(key.objectid < logical ||
|
|
key.objectid + bytes >
|
|
logical + map->stripe_len)) {
|
|
btrfs_err(fs_info,
|
|
"scrub: tree block %llu spanning stripes, ignored. logical=%llu",
|
|
key.objectid, logical);
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.uncorrectable_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
goto next;
|
|
}
|
|
|
|
again:
|
|
extent_logical = key.objectid;
|
|
extent_len = bytes;
|
|
|
|
/*
|
|
* trim extent to this stripe
|
|
*/
|
|
if (extent_logical < logical) {
|
|
extent_len -= logical - extent_logical;
|
|
extent_logical = logical;
|
|
}
|
|
if (extent_logical + extent_len >
|
|
logical + map->stripe_len) {
|
|
extent_len = logical + map->stripe_len -
|
|
extent_logical;
|
|
}
|
|
|
|
extent_physical = extent_logical - logical + physical;
|
|
extent_dev = scrub_dev;
|
|
extent_mirror_num = mirror_num;
|
|
if (sctx->is_dev_replace)
|
|
scrub_remap_extent(fs_info, extent_logical,
|
|
extent_len, &extent_physical,
|
|
&extent_dev,
|
|
&extent_mirror_num);
|
|
|
|
ret = btrfs_lookup_csums_range(csum_root,
|
|
extent_logical,
|
|
extent_logical +
|
|
extent_len - 1,
|
|
&sctx->csum_list, 1);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = scrub_extent(sctx, map, extent_logical, extent_len,
|
|
extent_physical, extent_dev, flags,
|
|
generation, extent_mirror_num,
|
|
extent_logical - logical + physical);
|
|
|
|
scrub_free_csums(sctx);
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (extent_logical + extent_len <
|
|
key.objectid + bytes) {
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
|
|
/*
|
|
* loop until we find next data stripe
|
|
* or we have finished all stripes.
|
|
*/
|
|
loop:
|
|
physical += map->stripe_len;
|
|
ret = get_raid56_logic_offset(physical,
|
|
num, map, &logical,
|
|
&stripe_logical);
|
|
logical += base;
|
|
|
|
if (ret && physical < physical_end) {
|
|
stripe_logical += base;
|
|
stripe_end = stripe_logical +
|
|
increment;
|
|
ret = scrub_raid56_parity(sctx,
|
|
map, scrub_dev, ppath,
|
|
stripe_logical,
|
|
stripe_end);
|
|
if (ret)
|
|
goto out;
|
|
goto loop;
|
|
}
|
|
} else {
|
|
physical += map->stripe_len;
|
|
logical += increment;
|
|
}
|
|
if (logical < key.objectid + bytes) {
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
|
|
if (physical >= physical_end) {
|
|
stop_loop = 1;
|
|
break;
|
|
}
|
|
}
|
|
next:
|
|
path->slots[0]++;
|
|
}
|
|
btrfs_release_path(path);
|
|
skip:
|
|
logical += increment;
|
|
physical += map->stripe_len;
|
|
spin_lock(&sctx->stat_lock);
|
|
if (stop_loop)
|
|
sctx->stat.last_physical = map->stripes[num].physical +
|
|
length;
|
|
else
|
|
sctx->stat.last_physical = physical;
|
|
spin_unlock(&sctx->stat_lock);
|
|
if (stop_loop)
|
|
break;
|
|
}
|
|
out:
|
|
/* push queued extents */
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
|
|
blk_finish_plug(&plug);
|
|
btrfs_free_path(path);
|
|
btrfs_free_path(ppath);
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
|
|
struct btrfs_device *scrub_dev,
|
|
u64 chunk_offset, u64 length,
|
|
u64 dev_offset,
|
|
struct btrfs_block_group_cache *cache)
|
|
{
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
|
|
struct map_lookup *map;
|
|
struct extent_map *em;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
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) {
|
|
/*
|
|
* Might have been an unused block group deleted by the cleaner
|
|
* kthread or relocation.
|
|
*/
|
|
spin_lock(&cache->lock);
|
|
if (!cache->removed)
|
|
ret = -EINVAL;
|
|
spin_unlock(&cache->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
map = em->map_lookup;
|
|
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->bdev == scrub_dev->bdev &&
|
|
map->stripes[i].physical == dev_offset) {
|
|
ret = scrub_stripe(sctx, map, scrub_dev, 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_ctx *sctx,
|
|
struct btrfs_device *scrub_dev, u64 start, u64 end)
|
|
{
|
|
struct btrfs_dev_extent *dev_extent = NULL;
|
|
struct btrfs_path *path;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
struct btrfs_root *root = fs_info->dev_root;
|
|
u64 length;
|
|
u64 chunk_offset;
|
|
int ret = 0;
|
|
int ro_set;
|
|
int slot;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_block_group_cache *cache;
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->reada = READA_FORWARD;
|
|
path->search_commit_root = 1;
|
|
path->skip_locking = 1;
|
|
|
|
key.objectid = scrub_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)
|
|
break;
|
|
if (ret > 0) {
|
|
if (path->slots[0] >=
|
|
btrfs_header_nritems(path->nodes[0])) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
break;
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
|
|
btrfs_item_key_to_cpu(l, &found_key, slot);
|
|
|
|
if (found_key.objectid != scrub_dev->devid)
|
|
break;
|
|
|
|
if (found_key.type != 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)
|
|
goto skip;
|
|
|
|
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);
|
|
|
|
/* some chunks are removed but not committed to disk yet,
|
|
* continue scrubbing */
|
|
if (!cache)
|
|
goto skip;
|
|
|
|
/*
|
|
* we need call btrfs_inc_block_group_ro() with scrubs_paused,
|
|
* to avoid deadlock caused by:
|
|
* btrfs_inc_block_group_ro()
|
|
* -> btrfs_wait_for_commit()
|
|
* -> btrfs_commit_transaction()
|
|
* -> btrfs_scrub_pause()
|
|
*/
|
|
scrub_pause_on(fs_info);
|
|
ret = btrfs_inc_block_group_ro(cache);
|
|
if (!ret && sctx->is_dev_replace) {
|
|
/*
|
|
* If we are doing a device replace wait for any tasks
|
|
* that started delalloc right before we set the block
|
|
* group to RO mode, as they might have just allocated
|
|
* an extent from it or decided they could do a nocow
|
|
* write. And if any such tasks did that, wait for their
|
|
* ordered extents to complete and then commit the
|
|
* current transaction, so that we can later see the new
|
|
* extent items in the extent tree - the ordered extents
|
|
* create delayed data references (for cow writes) when
|
|
* they complete, which will be run and insert the
|
|
* corresponding extent items into the extent tree when
|
|
* we commit the transaction they used when running
|
|
* inode.c:btrfs_finish_ordered_io(). We later use
|
|
* the commit root of the extent tree to find extents
|
|
* to copy from the srcdev into the tgtdev, and we don't
|
|
* want to miss any new extents.
|
|
*/
|
|
btrfs_wait_block_group_reservations(cache);
|
|
btrfs_wait_nocow_writers(cache);
|
|
ret = btrfs_wait_ordered_roots(fs_info, U64_MAX,
|
|
cache->key.objectid,
|
|
cache->key.offset);
|
|
if (ret > 0) {
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
ret = PTR_ERR(trans);
|
|
else
|
|
ret = btrfs_commit_transaction(trans);
|
|
if (ret) {
|
|
scrub_pause_off(fs_info);
|
|
btrfs_put_block_group(cache);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
scrub_pause_off(fs_info);
|
|
|
|
if (ret == 0) {
|
|
ro_set = 1;
|
|
} else if (ret == -ENOSPC) {
|
|
/*
|
|
* btrfs_inc_block_group_ro return -ENOSPC when it
|
|
* failed in creating new chunk for metadata.
|
|
* It is not a problem for scrub/replace, because
|
|
* metadata are always cowed, and our scrub paused
|
|
* commit_transactions.
|
|
*/
|
|
ro_set = 0;
|
|
} else {
|
|
btrfs_warn(fs_info,
|
|
"failed setting block group ro: %d", ret);
|
|
btrfs_put_block_group(cache);
|
|
break;
|
|
}
|
|
|
|
down_write(&fs_info->dev_replace.rwsem);
|
|
dev_replace->cursor_right = found_key.offset + length;
|
|
dev_replace->cursor_left = found_key.offset;
|
|
dev_replace->item_needs_writeback = 1;
|
|
up_write(&dev_replace->rwsem);
|
|
|
|
ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length,
|
|
found_key.offset, cache);
|
|
|
|
/*
|
|
* flush, submit all pending read and write bios, afterwards
|
|
* wait for them.
|
|
* Note that in the dev replace case, a read request causes
|
|
* write requests that are submitted in the read completion
|
|
* worker. Therefore in the current situation, it is required
|
|
* that all write requests are flushed, so that all read and
|
|
* write requests are really completed when bios_in_flight
|
|
* changes to 0.
|
|
*/
|
|
sctx->flush_all_writes = true;
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_lock);
|
|
|
|
wait_event(sctx->list_wait,
|
|
atomic_read(&sctx->bios_in_flight) == 0);
|
|
|
|
scrub_pause_on(fs_info);
|
|
|
|
/*
|
|
* must be called before we decrease @scrub_paused.
|
|
* make sure we don't block transaction commit while
|
|
* we are waiting pending workers finished.
|
|
*/
|
|
wait_event(sctx->list_wait,
|
|
atomic_read(&sctx->workers_pending) == 0);
|
|
sctx->flush_all_writes = false;
|
|
|
|
scrub_pause_off(fs_info);
|
|
|
|
down_write(&fs_info->dev_replace.rwsem);
|
|
dev_replace->cursor_left = dev_replace->cursor_right;
|
|
dev_replace->item_needs_writeback = 1;
|
|
up_write(&fs_info->dev_replace.rwsem);
|
|
|
|
if (ro_set)
|
|
btrfs_dec_block_group_ro(cache);
|
|
|
|
/*
|
|
* We might have prevented the cleaner kthread from deleting
|
|
* this block group if it was already unused because we raced
|
|
* and set it to RO mode first. So add it back to the unused
|
|
* list, otherwise it might not ever be deleted unless a manual
|
|
* balance is triggered or it becomes used and unused again.
|
|
*/
|
|
spin_lock(&cache->lock);
|
|
if (!cache->removed && !cache->ro && cache->reserved == 0 &&
|
|
btrfs_block_group_used(&cache->item) == 0) {
|
|
spin_unlock(&cache->lock);
|
|
btrfs_mark_bg_unused(cache);
|
|
} else {
|
|
spin_unlock(&cache->lock);
|
|
}
|
|
|
|
btrfs_put_block_group(cache);
|
|
if (ret)
|
|
break;
|
|
if (sctx->is_dev_replace &&
|
|
atomic64_read(&dev_replace->num_write_errors) > 0) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
if (sctx->stat.malloc_errors > 0) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
skip:
|
|
key.offset = found_key.offset + length;
|
|
btrfs_release_path(path);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
|
|
struct btrfs_device *scrub_dev)
|
|
{
|
|
int i;
|
|
u64 bytenr;
|
|
u64 gen;
|
|
int ret;
|
|
struct btrfs_fs_info *fs_info = sctx->fs_info;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
|
|
return -EIO;
|
|
|
|
/* Seed devices of a new filesystem has their own generation. */
|
|
if (scrub_dev->fs_devices != fs_info->fs_devices)
|
|
gen = scrub_dev->generation;
|
|
else
|
|
gen = 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 >
|
|
scrub_dev->commit_total_bytes)
|
|
break;
|
|
|
|
ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
|
|
scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
|
|
NULL, 1, bytenr);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
wait_event(sctx->list_wait, atomic_read(&sctx->bios_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_fs_info *fs_info,
|
|
int is_dev_replace)
|
|
{
|
|
unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
|
|
int max_active = fs_info->thread_pool_size;
|
|
|
|
lockdep_assert_held(&fs_info->scrub_lock);
|
|
|
|
if (refcount_read(&fs_info->scrub_workers_refcnt) == 0) {
|
|
ASSERT(fs_info->scrub_workers == NULL);
|
|
fs_info->scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub",
|
|
flags, is_dev_replace ? 1 : max_active, 4);
|
|
if (!fs_info->scrub_workers)
|
|
goto fail_scrub_workers;
|
|
|
|
ASSERT(fs_info->scrub_wr_completion_workers == NULL);
|
|
fs_info->scrub_wr_completion_workers =
|
|
btrfs_alloc_workqueue(fs_info, "scrubwrc", flags,
|
|
max_active, 2);
|
|
if (!fs_info->scrub_wr_completion_workers)
|
|
goto fail_scrub_wr_completion_workers;
|
|
|
|
ASSERT(fs_info->scrub_parity_workers == NULL);
|
|
fs_info->scrub_parity_workers =
|
|
btrfs_alloc_workqueue(fs_info, "scrubparity", flags,
|
|
max_active, 2);
|
|
if (!fs_info->scrub_parity_workers)
|
|
goto fail_scrub_parity_workers;
|
|
|
|
refcount_set(&fs_info->scrub_workers_refcnt, 1);
|
|
} else {
|
|
refcount_inc(&fs_info->scrub_workers_refcnt);
|
|
}
|
|
return 0;
|
|
|
|
fail_scrub_parity_workers:
|
|
btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
|
|
fail_scrub_wr_completion_workers:
|
|
btrfs_destroy_workqueue(fs_info->scrub_workers);
|
|
fail_scrub_workers:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
|
|
u64 end, struct btrfs_scrub_progress *progress,
|
|
int readonly, int is_dev_replace)
|
|
{
|
|
struct scrub_ctx *sctx;
|
|
int ret;
|
|
struct btrfs_device *dev;
|
|
unsigned int nofs_flag;
|
|
struct btrfs_workqueue *scrub_workers = NULL;
|
|
struct btrfs_workqueue *scrub_wr_comp = NULL;
|
|
struct btrfs_workqueue *scrub_parity = NULL;
|
|
|
|
if (btrfs_fs_closing(fs_info))
|
|
return -EAGAIN;
|
|
|
|
if (fs_info->nodesize > BTRFS_STRIPE_LEN) {
|
|
/*
|
|
* in this case scrub is unable to calculate the checksum
|
|
* the way scrub is implemented. Do not handle this
|
|
* situation at all because it won't ever happen.
|
|
*/
|
|
btrfs_err(fs_info,
|
|
"scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
|
|
fs_info->nodesize,
|
|
BTRFS_STRIPE_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (fs_info->sectorsize != PAGE_SIZE) {
|
|
/* not supported for data w/o checksums */
|
|
btrfs_err_rl(fs_info,
|
|
"scrub: size assumption sectorsize != PAGE_SIZE (%d != %lu) fails",
|
|
fs_info->sectorsize, PAGE_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (fs_info->nodesize >
|
|
PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
|
|
fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
|
|
/*
|
|
* would exhaust the array bounds of pagev member in
|
|
* struct scrub_block
|
|
*/
|
|
btrfs_err(fs_info,
|
|
"scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
|
|
fs_info->nodesize,
|
|
SCRUB_MAX_PAGES_PER_BLOCK,
|
|
fs_info->sectorsize,
|
|
SCRUB_MAX_PAGES_PER_BLOCK);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Allocate outside of device_list_mutex */
|
|
sctx = scrub_setup_ctx(fs_info, is_dev_replace);
|
|
if (IS_ERR(sctx))
|
|
return PTR_ERR(sctx);
|
|
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
|
|
if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) &&
|
|
!is_dev_replace)) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
ret = -ENODEV;
|
|
goto out_free_ctx;
|
|
}
|
|
|
|
if (!is_dev_replace && !readonly &&
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
btrfs_err_in_rcu(fs_info, "scrub: device %s is not writable",
|
|
rcu_str_deref(dev->name));
|
|
ret = -EROFS;
|
|
goto out_free_ctx;
|
|
}
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &dev->dev_state)) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
ret = -EIO;
|
|
goto out_free_ctx;
|
|
}
|
|
|
|
down_read(&fs_info->dev_replace.rwsem);
|
|
if (dev->scrub_ctx ||
|
|
(!is_dev_replace &&
|
|
btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
|
|
up_read(&fs_info->dev_replace.rwsem);
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
ret = -EINPROGRESS;
|
|
goto out_free_ctx;
|
|
}
|
|
up_read(&fs_info->dev_replace.rwsem);
|
|
|
|
ret = scrub_workers_get(fs_info, is_dev_replace);
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
goto out_free_ctx;
|
|
}
|
|
|
|
sctx->readonly = readonly;
|
|
dev->scrub_ctx = sctx;
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
|
|
/*
|
|
* checking @scrub_pause_req here, we can avoid
|
|
* race between committing transaction and scrubbing.
|
|
*/
|
|
__scrub_blocked_if_needed(fs_info);
|
|
atomic_inc(&fs_info->scrubs_running);
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
|
|
/*
|
|
* In order to avoid deadlock with reclaim when there is a transaction
|
|
* trying to pause scrub, make sure we use GFP_NOFS for all the
|
|
* allocations done at btrfs_scrub_pages() and scrub_pages_for_parity()
|
|
* invoked by our callees. The pausing request is done when the
|
|
* transaction commit starts, and it blocks the transaction until scrub
|
|
* is paused (done at specific points at scrub_stripe() or right above
|
|
* before incrementing fs_info->scrubs_running).
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
if (!is_dev_replace) {
|
|
btrfs_info(fs_info, "scrub: started on devid %llu", devid);
|
|
/*
|
|
* by holding device list mutex, we can
|
|
* kick off writing super in log tree sync.
|
|
*/
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
ret = scrub_supers(sctx, dev);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
}
|
|
|
|
if (!ret)
|
|
ret = scrub_enumerate_chunks(sctx, dev, start, end);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
|
|
wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
|
|
atomic_dec(&fs_info->scrubs_running);
|
|
wake_up(&fs_info->scrub_pause_wait);
|
|
|
|
wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
|
|
|
|
if (progress)
|
|
memcpy(progress, &sctx->stat, sizeof(*progress));
|
|
|
|
if (!is_dev_replace)
|
|
btrfs_info(fs_info, "scrub: %s on devid %llu with status: %d",
|
|
ret ? "not finished" : "finished", devid, ret);
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
dev->scrub_ctx = NULL;
|
|
if (refcount_dec_and_test(&fs_info->scrub_workers_refcnt)) {
|
|
scrub_workers = fs_info->scrub_workers;
|
|
scrub_wr_comp = fs_info->scrub_wr_completion_workers;
|
|
scrub_parity = fs_info->scrub_parity_workers;
|
|
|
|
fs_info->scrub_workers = NULL;
|
|
fs_info->scrub_wr_completion_workers = NULL;
|
|
fs_info->scrub_parity_workers = NULL;
|
|
}
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
|
|
btrfs_destroy_workqueue(scrub_workers);
|
|
btrfs_destroy_workqueue(scrub_wr_comp);
|
|
btrfs_destroy_workqueue(scrub_parity);
|
|
scrub_put_ctx(sctx);
|
|
|
|
return ret;
|
|
|
|
out_free_ctx:
|
|
scrub_free_ctx(sctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_scrub_pause(struct btrfs_fs_info *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);
|
|
}
|
|
|
|
void btrfs_scrub_continue(struct btrfs_fs_info *fs_info)
|
|
{
|
|
atomic_dec(&fs_info->scrub_pause_req);
|
|
wake_up(&fs_info->scrub_pause_wait);
|
|
}
|
|
|
|
int btrfs_scrub_cancel(struct btrfs_fs_info *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_device *dev)
|
|
{
|
|
struct btrfs_fs_info *fs_info = dev->fs_info;
|
|
struct scrub_ctx *sctx;
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
sctx = dev->scrub_ctx;
|
|
if (!sctx) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
return -ENOTCONN;
|
|
}
|
|
atomic_inc(&sctx->cancel_req);
|
|
while (dev->scrub_ctx) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
wait_event(fs_info->scrub_pause_wait,
|
|
dev->scrub_ctx == NULL);
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
}
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
|
|
struct btrfs_scrub_progress *progress)
|
|
{
|
|
struct btrfs_device *dev;
|
|
struct scrub_ctx *sctx = NULL;
|
|
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
|
|
if (dev)
|
|
sctx = dev->scrub_ctx;
|
|
if (sctx)
|
|
memcpy(progress, &sctx->stat, sizeof(*progress));
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
|
|
return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
|
|
}
|
|
|
|
static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
|
|
u64 extent_logical, u64 extent_len,
|
|
u64 *extent_physical,
|
|
struct btrfs_device **extent_dev,
|
|
int *extent_mirror_num)
|
|
{
|
|
u64 mapped_length;
|
|
struct btrfs_bio *bbio = NULL;
|
|
int ret;
|
|
|
|
mapped_length = extent_len;
|
|
ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, extent_logical,
|
|
&mapped_length, &bbio, 0);
|
|
if (ret || !bbio || mapped_length < extent_len ||
|
|
!bbio->stripes[0].dev->bdev) {
|
|
btrfs_put_bbio(bbio);
|
|
return;
|
|
}
|
|
|
|
*extent_physical = bbio->stripes[0].physical;
|
|
*extent_mirror_num = bbio->mirror_num;
|
|
*extent_dev = bbio->stripes[0].dev;
|
|
btrfs_put_bbio(bbio);
|
|
}
|