![Tsutomu Itoh](/assets/img/avatar_default.png)
The address that should be freed is not 'ppath' but 'path'. Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com> Reviewed-by: Miao Xie <miaoxie@huawei.com> Signed-off-by: Chris Mason <clm@fb.com>
4257 lines
110 KiB
C
4257 lines
110 KiB
C
/*
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* Copyright (C) 2011, 2012 STRATO. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/blkdev.h>
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#include <linux/ratelimit.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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atomic_t refs;
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struct btrfs_bio *bbio;
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u64 *raid_map;
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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 ref_count;
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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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int err;
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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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atomic_t ref_count; /* 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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};
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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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int stripe_len;
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atomic_t ref_count;
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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_wr_ctx {
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struct scrub_bio *wr_curr_bio;
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struct btrfs_device *tgtdev;
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int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
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atomic_t flush_all_writes;
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struct mutex wr_lock;
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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_root *dev_root;
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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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u32 sectorsize;
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u32 nodesize;
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int is_dev_replace;
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struct scrub_wr_ctx wr_ctx;
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/*
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* statistics
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*/
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struct btrfs_scrub_progress stat;
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spinlock_t stat_lock;
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};
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struct scrub_fixup_nodatasum {
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struct scrub_ctx *sctx;
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struct btrfs_device *dev;
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u64 logical;
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struct btrfs_root *root;
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struct btrfs_work work;
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int mirror_num;
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};
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struct scrub_nocow_inode {
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u64 inum;
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u64 offset;
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u64 root;
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struct list_head list;
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};
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struct scrub_copy_nocow_ctx {
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struct scrub_ctx *sctx;
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u64 logical;
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u64 len;
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int mirror_num;
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u64 physical_for_dev_replace;
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struct list_head inodes;
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struct btrfs_work work;
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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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sector_t sector;
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u64 logical;
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struct btrfs_device *dev;
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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 void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
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static void scrub_pending_trans_workers_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_ctx *sctx,
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struct btrfs_fs_info *fs_info,
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struct scrub_block *original_sblock,
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u64 length, u64 logical,
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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, int is_metadata,
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int have_csum, u8 *csum, u64 generation,
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u16 csum_size, int retry_failed_mirror);
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static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
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struct scrub_block *sblock,
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int is_metadata, int have_csum,
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const u8 *csum, u64 generation,
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u16 csum_size);
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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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int force_write);
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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, int err);
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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_setup_wr_ctx(struct scrub_ctx *sctx,
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struct scrub_wr_ctx *wr_ctx,
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struct btrfs_fs_info *fs_info,
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struct btrfs_device *dev,
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int is_dev_replace);
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static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
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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, int err);
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static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
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static int write_page_nocow(struct scrub_ctx *sctx,
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u64 physical_for_dev_replace, struct page *page);
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static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
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struct scrub_copy_nocow_ctx *ctx);
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static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
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int mirror_num, u64 physical_for_dev_replace);
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static void copy_nocow_pages_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_pending_bio_inc(struct scrub_ctx *sctx)
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{
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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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}
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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_blocked_if_needed(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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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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/*
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* used for workers that require transaction commits (i.e., for the
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* NOCOW case)
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*/
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static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
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{
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struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
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/*
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* increment scrubs_running to prevent cancel requests from
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* completing as long as a worker is running. we must also
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* increment scrubs_paused to prevent deadlocking on pause
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* requests used for transactions commits (as the worker uses a
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* transaction context). it is safe to regard the worker
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* as paused for all matters practical. effectively, we only
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* avoid cancellation requests from completing.
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*/
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mutex_lock(&fs_info->scrub_lock);
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atomic_inc(&fs_info->scrubs_running);
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atomic_inc(&fs_info->scrubs_paused);
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mutex_unlock(&fs_info->scrub_lock);
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/*
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* check if @scrubs_running=@scrubs_paused condition
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* inside wait_event() is not an atomic operation.
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* which means we may inc/dec @scrub_running/paused
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* at any time. Let's wake up @scrub_pause_wait as
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* much as we can to let commit transaction blocked less.
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*/
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wake_up(&fs_info->scrub_pause_wait);
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atomic_inc(&sctx->workers_pending);
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}
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/* used for workers that require transaction commits */
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static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
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{
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struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
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/*
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* see scrub_pending_trans_workers_inc() why we're pretending
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* to be paused in the scrub counters
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*/
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mutex_lock(&fs_info->scrub_lock);
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atomic_dec(&fs_info->scrubs_running);
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atomic_dec(&fs_info->scrubs_paused);
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mutex_unlock(&fs_info->scrub_lock);
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atomic_dec(&sctx->workers_pending);
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wake_up(&fs_info->scrub_pause_wait);
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wake_up(&sctx->list_wait);
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}
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static void scrub_free_csums(struct scrub_ctx *sctx)
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{
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while (!list_empty(&sctx->csum_list)) {
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struct btrfs_ordered_sum *sum;
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sum = list_first_entry(&sctx->csum_list,
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struct btrfs_ordered_sum, list);
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list_del(&sum->list);
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kfree(sum);
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}
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}
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static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
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{
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int i;
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if (!sctx)
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return;
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scrub_free_wr_ctx(&sctx->wr_ctx);
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/* this can happen when scrub is cancelled */
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if (sctx->curr != -1) {
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struct scrub_bio *sbio = sctx->bios[sctx->curr];
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for (i = 0; i < sbio->page_count; i++) {
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WARN_ON(!sbio->pagev[i]->page);
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scrub_block_put(sbio->pagev[i]->sblock);
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}
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bio_put(sbio->bio);
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}
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for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
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struct scrub_bio *sbio = sctx->bios[i];
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if (!sbio)
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break;
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kfree(sbio);
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}
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scrub_free_csums(sctx);
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kfree(sctx);
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}
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static noinline_for_stack
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struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
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{
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struct scrub_ctx *sctx;
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int i;
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struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
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int pages_per_rd_bio;
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int ret;
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/*
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* the setting of pages_per_rd_bio is correct for scrub but might
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* be wrong for the dev_replace code where we might read from
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* different devices in the initial huge bios. However, that
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* code is able to correctly handle the case when adding a page
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* to a bio fails.
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*/
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if (dev->bdev)
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pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO,
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bio_get_nr_vecs(dev->bdev));
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else
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pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
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sctx = kzalloc(sizeof(*sctx), GFP_NOFS);
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if (!sctx)
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goto nomem;
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sctx->is_dev_replace = is_dev_replace;
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sctx->pages_per_rd_bio = pages_per_rd_bio;
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sctx->curr = -1;
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sctx->dev_root = dev->dev_root;
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for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
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struct scrub_bio *sbio;
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sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
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if (!sbio)
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goto nomem;
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sctx->bios[i] = sbio;
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sbio->index = i;
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sbio->sctx = sctx;
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sbio->page_count = 0;
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btrfs_init_work(&sbio->work, btrfs_scrub_helper,
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scrub_bio_end_io_worker, NULL, NULL);
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if (i != SCRUB_BIOS_PER_SCTX - 1)
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sctx->bios[i]->next_free = i + 1;
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else
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sctx->bios[i]->next_free = -1;
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}
|
|
sctx->first_free = 0;
|
|
sctx->nodesize = dev->dev_root->nodesize;
|
|
sctx->sectorsize = dev->dev_root->sectorsize;
|
|
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);
|
|
INIT_LIST_HEAD(&sctx->csum_list);
|
|
|
|
spin_lock_init(&sctx->list_lock);
|
|
spin_lock_init(&sctx->stat_lock);
|
|
init_waitqueue_head(&sctx->list_wait);
|
|
|
|
ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info,
|
|
fs_info->dev_replace.tgtdev, is_dev_replace);
|
|
if (ret) {
|
|
scrub_free_ctx(sctx);
|
|
return ERR_PTR(ret);
|
|
}
|
|
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;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct scrub_warning *swarn = warn_ctx;
|
|
struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
|
|
struct inode_fs_paths *ipath = NULL;
|
|
struct btrfs_root *local_root;
|
|
struct btrfs_key root_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;
|
|
}
|
|
|
|
ret = inode_item_info(inum, 0, local_root, swarn->path);
|
|
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);
|
|
|
|
ipath = init_ipath(4096, local_root, swarn->path);
|
|
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)
|
|
printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
|
|
"%s, sector %llu, root %llu, inode %llu, offset %llu, "
|
|
"length %llu, links %u (path: %s)\n", swarn->errstr,
|
|
swarn->logical, rcu_str_deref(swarn->dev->name),
|
|
(unsigned long long)swarn->sector, root, inum, offset,
|
|
min(isize - offset, (u64)PAGE_SIZE), nlink,
|
|
(char *)(unsigned long)ipath->fspath->val[i]);
|
|
|
|
free_ipath(ipath);
|
|
return 0;
|
|
|
|
err:
|
|
printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
|
|
"%s, sector %llu, root %llu, inode %llu, offset %llu: path "
|
|
"resolving failed with ret=%d\n", swarn->errstr,
|
|
swarn->logical, rcu_str_deref(swarn->dev->name),
|
|
(unsigned long long)swarn->sector, 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;
|
|
int ret;
|
|
|
|
WARN_ON(sblock->page_count < 1);
|
|
dev = sblock->pagev[0]->dev;
|
|
fs_info = sblock->sctx->dev_root->fs_info;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return;
|
|
|
|
swarn.sector = (sblock->pagev[0]->physical) >> 9;
|
|
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);
|
|
printk_in_rcu(KERN_WARNING
|
|
"BTRFS: %s at logical %llu on dev %s, "
|
|
"sector %llu: metadata %s (level %d) in tree "
|
|
"%llu\n", errstr, swarn.logical,
|
|
rcu_str_deref(dev->name),
|
|
(unsigned long long)swarn.sector,
|
|
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);
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
}
|
|
|
|
static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
|
|
{
|
|
struct page *page = NULL;
|
|
unsigned long index;
|
|
struct scrub_fixup_nodatasum *fixup = fixup_ctx;
|
|
int ret;
|
|
int corrected = 0;
|
|
struct btrfs_key key;
|
|
struct inode *inode = NULL;
|
|
struct btrfs_fs_info *fs_info;
|
|
u64 end = offset + PAGE_SIZE - 1;
|
|
struct btrfs_root *local_root;
|
|
int srcu_index;
|
|
|
|
key.objectid = root;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
fs_info = fixup->root->fs_info;
|
|
srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
|
|
|
|
local_root = btrfs_read_fs_root_no_name(fs_info, &key);
|
|
if (IS_ERR(local_root)) {
|
|
srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
|
|
return PTR_ERR(local_root);
|
|
}
|
|
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.objectid = inum;
|
|
key.offset = 0;
|
|
inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
|
|
srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
|
|
index = offset >> PAGE_CACHE_SHIFT;
|
|
|
|
page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
|
|
if (!page) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (PageUptodate(page)) {
|
|
if (PageDirty(page)) {
|
|
/*
|
|
* we need to write the data to the defect sector. the
|
|
* data that was in that sector is not in memory,
|
|
* because the page was modified. we must not write the
|
|
* modified page to that sector.
|
|
*
|
|
* TODO: what could be done here: wait for the delalloc
|
|
* runner to write out that page (might involve
|
|
* COW) and see whether the sector is still
|
|
* referenced afterwards.
|
|
*
|
|
* For the meantime, we'll treat this error
|
|
* incorrectable, although there is a chance that a
|
|
* later scrub will find the bad sector again and that
|
|
* there's no dirty page in memory, then.
|
|
*/
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
ret = repair_io_failure(inode, offset, PAGE_SIZE,
|
|
fixup->logical, page,
|
|
offset - page_offset(page),
|
|
fixup->mirror_num);
|
|
unlock_page(page);
|
|
corrected = !ret;
|
|
} else {
|
|
/*
|
|
* we need to get good data first. the general readpage path
|
|
* will call repair_io_failure for us, we just have to make
|
|
* sure we read the bad mirror.
|
|
*/
|
|
ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
|
|
EXTENT_DAMAGED, GFP_NOFS);
|
|
if (ret) {
|
|
/* set_extent_bits should give proper error */
|
|
WARN_ON(ret > 0);
|
|
if (ret > 0)
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page,
|
|
btrfs_get_extent,
|
|
fixup->mirror_num);
|
|
wait_on_page_locked(page);
|
|
|
|
corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset,
|
|
end, EXTENT_DAMAGED, 0, NULL);
|
|
if (!corrected)
|
|
clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
|
|
EXTENT_DAMAGED, GFP_NOFS);
|
|
}
|
|
|
|
out:
|
|
if (page)
|
|
put_page(page);
|
|
|
|
iput(inode);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ret == 0 && corrected) {
|
|
/*
|
|
* we only need to call readpage for one of the inodes belonging
|
|
* to this extent. so make iterate_extent_inodes stop
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
static void scrub_fixup_nodatasum(struct btrfs_work *work)
|
|
{
|
|
int ret;
|
|
struct scrub_fixup_nodatasum *fixup;
|
|
struct scrub_ctx *sctx;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct btrfs_path *path;
|
|
int uncorrectable = 0;
|
|
|
|
fixup = container_of(work, struct scrub_fixup_nodatasum, work);
|
|
sctx = fixup->sctx;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
spin_lock(&sctx->stat_lock);
|
|
++sctx->stat.malloc_errors;
|
|
spin_unlock(&sctx->stat_lock);
|
|
uncorrectable = 1;
|
|
goto out;
|
|
}
|
|
|
|
trans = btrfs_join_transaction(fixup->root);
|
|
if (IS_ERR(trans)) {
|
|
uncorrectable = 1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* the idea is to trigger a regular read through the standard path. we
|
|
* read a page from the (failed) logical address by specifying the
|
|
* corresponding copynum of the failed sector. thus, that readpage is
|
|
* expected to fail.
|
|
* that is the point where on-the-fly error correction will kick in
|
|
* (once it's finished) and rewrite the failed sector if a good copy
|
|
* can be found.
|
|
*/
|
|
ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info,
|
|
path, scrub_fixup_readpage,
|
|
fixup);
|
|
if (ret < 0) {
|
|
uncorrectable = 1;
|
|
goto out;
|
|
}
|
|
WARN_ON(ret != 1);
|
|
|
|
spin_lock(&sctx->stat_lock);
|
|
++sctx->stat.corrected_errors;
|
|
spin_unlock(&sctx->stat_lock);
|
|
|
|
out:
|
|
if (trans && !IS_ERR(trans))
|
|
btrfs_end_transaction(trans, fixup->root);
|
|
if (uncorrectable) {
|
|
spin_lock(&sctx->stat_lock);
|
|
++sctx->stat.uncorrectable_errors;
|
|
spin_unlock(&sctx->stat_lock);
|
|
btrfs_dev_replace_stats_inc(
|
|
&sctx->dev_root->fs_info->dev_replace.
|
|
num_uncorrectable_read_errors);
|
|
printk_ratelimited_in_rcu(KERN_ERR "BTRFS: "
|
|
"unable to fixup (nodatasum) error at logical %llu on dev %s\n",
|
|
fixup->logical, rcu_str_deref(fixup->dev->name));
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
kfree(fixup);
|
|
|
|
scrub_pending_trans_workers_dec(sctx);
|
|
}
|
|
|
|
static inline void scrub_get_recover(struct scrub_recover *recover)
|
|
{
|
|
atomic_inc(&recover->refs);
|
|
}
|
|
|
|
static inline void scrub_put_recover(struct scrub_recover *recover)
|
|
{
|
|
if (atomic_dec_and_test(&recover->refs)) {
|
|
kfree(recover->bbio);
|
|
kfree(recover->raid_map);
|
|
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 length;
|
|
u64 logical;
|
|
u64 generation;
|
|
unsigned int failed_mirror_index;
|
|
unsigned int is_metadata;
|
|
unsigned int have_csum;
|
|
u8 *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;
|
|
static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
|
|
DEFAULT_RATELIMIT_BURST);
|
|
|
|
BUG_ON(sblock_to_check->page_count < 1);
|
|
fs_info = sctx->dev_root->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;
|
|
}
|
|
length = sblock_to_check->page_count * PAGE_SIZE;
|
|
logical = sblock_to_check->pagev[0]->logical;
|
|
generation = sblock_to_check->pagev[0]->generation;
|
|
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;
|
|
csum = sblock_to_check->pagev[0]->csum;
|
|
dev = sblock_to_check->pagev[0]->dev;
|
|
|
|
if (sctx->is_dev_replace && !is_metadata && !have_csum) {
|
|
sblocks_for_recheck = NULL;
|
|
goto nodatasum_case;
|
|
}
|
|
|
|
/*
|
|
* 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 = kzalloc(BTRFS_MAX_MIRRORS *
|
|
sizeof(*sblocks_for_recheck),
|
|
GFP_NOFS);
|
|
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(sctx, fs_info, sblock_to_check, length,
|
|
logical, 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, is_metadata, have_csum,
|
|
csum, generation, sctx->csum_size, 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;
|
|
}
|
|
|
|
if (!is_metadata && !have_csum) {
|
|
struct scrub_fixup_nodatasum *fixup_nodatasum;
|
|
|
|
nodatasum_case:
|
|
WARN_ON(sctx->is_dev_replace);
|
|
|
|
/*
|
|
* !is_metadata and !have_csum, this means that the data
|
|
* might not be COW'ed, that it might be modified
|
|
* concurrently. The general strategy to work on the
|
|
* commit root does not help in the case when COW is not
|
|
* used.
|
|
*/
|
|
fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS);
|
|
if (!fixup_nodatasum)
|
|
goto did_not_correct_error;
|
|
fixup_nodatasum->sctx = sctx;
|
|
fixup_nodatasum->dev = dev;
|
|
fixup_nodatasum->logical = logical;
|
|
fixup_nodatasum->root = fs_info->extent_root;
|
|
fixup_nodatasum->mirror_num = failed_mirror_index + 1;
|
|
scrub_pending_trans_workers_inc(sctx);
|
|
btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper,
|
|
scrub_fixup_nodatasum, NULL, NULL);
|
|
btrfs_queue_work(fs_info->scrub_workers,
|
|
&fixup_nodatasum->work);
|
|
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 < BTRFS_MAX_MIRRORS &&
|
|
sblocks_for_recheck[mirror_index].page_count > 0;
|
|
mirror_index++) {
|
|
struct scrub_block *sblock_other;
|
|
|
|
if (mirror_index == failed_mirror_index)
|
|
continue;
|
|
sblock_other = sblocks_for_recheck + mirror_index;
|
|
|
|
/* build and submit the bios, check checksums */
|
|
scrub_recheck_block(fs_info, sblock_other, is_metadata,
|
|
have_csum, csum, generation,
|
|
sctx->csum_size, 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);
|
|
} else {
|
|
int force_write = is_metadata || have_csum;
|
|
|
|
ret = scrub_repair_block_from_good_copy(
|
|
sblock_bad, sblock_other,
|
|
force_write);
|
|
}
|
|
if (0 == ret)
|
|
goto corrected_error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* for dev_replace, pick good pages and write to the target device.
|
|
*/
|
|
if (sctx->is_dev_replace) {
|
|
success = 1;
|
|
for (page_num = 0; page_num < sblock_bad->page_count;
|
|
page_num++) {
|
|
int sub_success;
|
|
|
|
sub_success = 0;
|
|
for (mirror_index = 0;
|
|
mirror_index < BTRFS_MAX_MIRRORS &&
|
|
sblocks_for_recheck[mirror_index].page_count > 0;
|
|
mirror_index++) {
|
|
struct scrub_block *sblock_other =
|
|
sblocks_for_recheck + mirror_index;
|
|
struct scrub_page *page_other =
|
|
sblock_other->pagev[page_num];
|
|
|
|
if (!page_other->io_error) {
|
|
ret = scrub_write_page_to_dev_replace(
|
|
sblock_other, page_num);
|
|
if (ret == 0) {
|
|
/* succeeded for this page */
|
|
sub_success = 1;
|
|
break;
|
|
} else {
|
|
btrfs_dev_replace_stats_inc(
|
|
&sctx->dev_root->
|
|
fs_info->dev_replace.
|
|
num_write_errors);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!sub_success) {
|
|
/*
|
|
* 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
|
|
*/
|
|
success = 0;
|
|
ret = scrub_write_page_to_dev_replace(
|
|
sblock_bad, page_num);
|
|
if (ret)
|
|
btrfs_dev_replace_stats_inc(
|
|
&sctx->dev_root->fs_info->
|
|
dev_replace.num_write_errors);
|
|
}
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* for regular scrub, repair those pages that are errored.
|
|
* 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 succeedes. 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.
|
|
*/
|
|
|
|
/* can only fix I/O errors from here on */
|
|
if (sblock_bad->no_io_error_seen)
|
|
goto did_not_correct_error;
|
|
|
|
success = 1;
|
|
for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
|
|
struct scrub_page *page_bad = sblock_bad->pagev[page_num];
|
|
|
|
if (!page_bad->io_error)
|
|
continue;
|
|
|
|
for (mirror_index = 0;
|
|
mirror_index < BTRFS_MAX_MIRRORS &&
|
|
sblocks_for_recheck[mirror_index].page_count > 0;
|
|
mirror_index++) {
|
|
struct scrub_block *sblock_other = sblocks_for_recheck +
|
|
mirror_index;
|
|
struct scrub_page *page_other = sblock_other->pagev[
|
|
page_num];
|
|
|
|
if (!page_other->io_error) {
|
|
ret = scrub_repair_page_from_good_copy(
|
|
sblock_bad, sblock_other, page_num, 0);
|
|
if (0 == ret) {
|
|
page_bad->io_error = 0;
|
|
break; /* succeeded for this page */
|
|
}
|
|
}
|
|
}
|
|
|
|
if (page_bad->io_error) {
|
|
/* did not find a mirror to copy the page from */
|
|
success = 0;
|
|
}
|
|
}
|
|
|
|
if (success) {
|
|
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,
|
|
is_metadata, have_csum, csum,
|
|
generation, sctx->csum_size, 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);
|
|
printk_ratelimited_in_rcu(KERN_ERR
|
|
"BTRFS: fixed up error at logical %llu on dev %s\n",
|
|
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);
|
|
printk_ratelimited_in_rcu(KERN_ERR
|
|
"BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n",
|
|
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(recover);
|
|
sblock->pagev[page_index]->recover =
|
|
NULL;
|
|
}
|
|
scrub_page_put(sblock->pagev[page_index]);
|
|
}
|
|
}
|
|
kfree(sblocks_for_recheck);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio, u64 *raid_map)
|
|
{
|
|
if (raid_map) {
|
|
if (raid_map[bbio->num_stripes - 1] == RAID6_Q_STRIPE)
|
|
return 3;
|
|
else
|
|
return 2;
|
|
} else {
|
|
return (int)bbio->num_stripes;
|
|
}
|
|
}
|
|
|
|
static inline void scrub_stripe_index_and_offset(u64 logical, u64 *raid_map,
|
|
u64 mapped_length,
|
|
int nstripes, int mirror,
|
|
int *stripe_index,
|
|
u64 *stripe_offset)
|
|
{
|
|
int i;
|
|
|
|
if (raid_map) {
|
|
/* 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_ctx *sctx,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct scrub_block *original_sblock,
|
|
u64 length, u64 logical,
|
|
struct scrub_block *sblocks_for_recheck)
|
|
{
|
|
struct scrub_recover *recover;
|
|
struct btrfs_bio *bbio;
|
|
u64 *raid_map;
|
|
u64 sublen;
|
|
u64 mapped_length;
|
|
u64 stripe_offset;
|
|
int stripe_index;
|
|
int page_index;
|
|
int mirror_index;
|
|
int nmirrors;
|
|
int ret;
|
|
|
|
/*
|
|
* note: the two members ref_count and outstanding_pages
|
|
* are not used (and not set) in the blocks that are used for
|
|
* the recheck procedure
|
|
*/
|
|
|
|
page_index = 0;
|
|
while (length > 0) {
|
|
sublen = min_t(u64, length, PAGE_SIZE);
|
|
mapped_length = sublen;
|
|
bbio = NULL;
|
|
raid_map = NULL;
|
|
|
|
/*
|
|
* with a length of PAGE_SIZE, each returned stripe
|
|
* represents one mirror
|
|
*/
|
|
ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical,
|
|
&mapped_length, &bbio, 0, &raid_map);
|
|
if (ret || !bbio || mapped_length < sublen) {
|
|
kfree(bbio);
|
|
kfree(raid_map);
|
|
return -EIO;
|
|
}
|
|
|
|
recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
|
|
if (!recover) {
|
|
kfree(bbio);
|
|
kfree(raid_map);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
atomic_set(&recover->refs, 1);
|
|
recover->bbio = bbio;
|
|
recover->raid_map = raid_map;
|
|
recover->map_length = mapped_length;
|
|
|
|
BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
|
|
|
|
nmirrors = scrub_nr_raid_mirrors(bbio, raid_map);
|
|
for (mirror_index = 0; mirror_index < nmirrors;
|
|
mirror_index++) {
|
|
struct scrub_block *sblock;
|
|
struct scrub_page *page;
|
|
|
|
if (mirror_index >= BTRFS_MAX_MIRRORS)
|
|
continue;
|
|
|
|
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(recover);
|
|
return -ENOMEM;
|
|
}
|
|
scrub_page_get(page);
|
|
sblock->pagev[page_index] = page;
|
|
page->logical = logical;
|
|
|
|
scrub_stripe_index_and_offset(logical, raid_map,
|
|
mapped_length,
|
|
bbio->num_stripes,
|
|
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(recover);
|
|
length -= sublen;
|
|
logical += sublen;
|
|
page_index++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct scrub_bio_ret {
|
|
struct completion event;
|
|
int error;
|
|
};
|
|
|
|
static void scrub_bio_wait_endio(struct bio *bio, int error)
|
|
{
|
|
struct scrub_bio_ret *ret = bio->bi_private;
|
|
|
|
ret->error = error;
|
|
complete(&ret->event);
|
|
}
|
|
|
|
static inline int scrub_is_page_on_raid56(struct scrub_page *page)
|
|
{
|
|
return page->recover && page->recover->raid_map;
|
|
}
|
|
|
|
static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
|
|
struct bio *bio,
|
|
struct scrub_page *page)
|
|
{
|
|
struct scrub_bio_ret done;
|
|
int ret;
|
|
|
|
init_completion(&done.event);
|
|
done.error = 0;
|
|
bio->bi_iter.bi_sector = page->logical >> 9;
|
|
bio->bi_private = &done;
|
|
bio->bi_end_io = scrub_bio_wait_endio;
|
|
|
|
ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio,
|
|
page->recover->raid_map,
|
|
page->recover->map_length,
|
|
page->mirror_num, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
wait_for_completion(&done.event);
|
|
if (done.error)
|
|
return -EIO;
|
|
|
|
return 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 is_metadata,
|
|
int have_csum, u8 *csum, u64 generation,
|
|
u16 csum_size, int retry_failed_mirror)
|
|
{
|
|
int page_num;
|
|
|
|
sblock->no_io_error_seen = 1;
|
|
sblock->header_error = 0;
|
|
sblock->checksum_error = 0;
|
|
|
|
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(GFP_NOFS, 1);
|
|
if (!bio) {
|
|
page->io_error = 1;
|
|
sblock->no_io_error_seen = 0;
|
|
continue;
|
|
}
|
|
bio->bi_bdev = page->dev->bdev;
|
|
|
|
bio_add_page(bio, page->page, PAGE_SIZE, 0);
|
|
if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) {
|
|
if (scrub_submit_raid56_bio_wait(fs_info, bio, page))
|
|
sblock->no_io_error_seen = 0;
|
|
} else {
|
|
bio->bi_iter.bi_sector = page->physical >> 9;
|
|
|
|
if (btrfsic_submit_bio_wait(READ, bio))
|
|
sblock->no_io_error_seen = 0;
|
|
}
|
|
|
|
bio_put(bio);
|
|
}
|
|
|
|
if (sblock->no_io_error_seen)
|
|
scrub_recheck_block_checksum(fs_info, sblock, is_metadata,
|
|
have_csum, csum, generation,
|
|
csum_size);
|
|
|
|
return;
|
|
}
|
|
|
|
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_UUID_SIZE);
|
|
return !ret;
|
|
}
|
|
|
|
static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
|
|
struct scrub_block *sblock,
|
|
int is_metadata, int have_csum,
|
|
const u8 *csum, u64 generation,
|
|
u16 csum_size)
|
|
{
|
|
int page_num;
|
|
u8 calculated_csum[BTRFS_CSUM_SIZE];
|
|
u32 crc = ~(u32)0;
|
|
void *mapped_buffer;
|
|
|
|
WARN_ON(!sblock->pagev[0]->page);
|
|
if (is_metadata) {
|
|
struct btrfs_header *h;
|
|
|
|
mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
|
|
h = (struct btrfs_header *)mapped_buffer;
|
|
|
|
if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) ||
|
|
!scrub_check_fsid(h->fsid, sblock->pagev[0]) ||
|
|
memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
|
|
BTRFS_UUID_SIZE)) {
|
|
sblock->header_error = 1;
|
|
} else if (generation != btrfs_stack_header_generation(h)) {
|
|
sblock->header_error = 1;
|
|
sblock->generation_error = 1;
|
|
}
|
|
csum = h->csum;
|
|
} else {
|
|
if (!have_csum)
|
|
return;
|
|
|
|
mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
|
|
}
|
|
|
|
for (page_num = 0;;) {
|
|
if (page_num == 0 && is_metadata)
|
|
crc = btrfs_csum_data(
|
|
((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE,
|
|
crc, PAGE_SIZE - BTRFS_CSUM_SIZE);
|
|
else
|
|
crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE);
|
|
|
|
kunmap_atomic(mapped_buffer);
|
|
page_num++;
|
|
if (page_num >= sblock->page_count)
|
|
break;
|
|
WARN_ON(!sblock->pagev[page_num]->page);
|
|
|
|
mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page);
|
|
}
|
|
|
|
btrfs_csum_final(crc, calculated_csum);
|
|
if (memcmp(calculated_csum, csum, csum_size))
|
|
sblock->checksum_error = 1;
|
|
}
|
|
|
|
static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
|
|
struct scrub_block *sblock_good,
|
|
int force_write)
|
|
{
|
|
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,
|
|
force_write);
|
|
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];
|
|
|
|
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) {
|
|
printk_ratelimited(KERN_WARNING "BTRFS: "
|
|
"scrub_repair_page_from_good_copy(bdev == NULL) "
|
|
"is unexpected!\n");
|
|
return -EIO;
|
|
}
|
|
|
|
bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
|
|
if (!bio)
|
|
return -EIO;
|
|
bio->bi_bdev = page_bad->dev->bdev;
|
|
bio->bi_iter.bi_sector = page_bad->physical >> 9;
|
|
|
|
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(WRITE, bio)) {
|
|
btrfs_dev_stat_inc_and_print(page_bad->dev,
|
|
BTRFS_DEV_STAT_WRITE_ERRS);
|
|
btrfs_dev_replace_stats_inc(
|
|
&sblock_bad->sctx->dev_root->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)
|
|
{
|
|
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)
|
|
btrfs_dev_replace_stats_inc(
|
|
&sblock->sctx->dev_root->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);
|
|
|
|
memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
|
|
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_wr_ctx *wr_ctx = &sctx->wr_ctx;
|
|
struct scrub_bio *sbio;
|
|
int ret;
|
|
|
|
mutex_lock(&wr_ctx->wr_lock);
|
|
again:
|
|
if (!wr_ctx->wr_curr_bio) {
|
|
wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio),
|
|
GFP_NOFS);
|
|
if (!wr_ctx->wr_curr_bio) {
|
|
mutex_unlock(&wr_ctx->wr_lock);
|
|
return -ENOMEM;
|
|
}
|
|
wr_ctx->wr_curr_bio->sctx = sctx;
|
|
wr_ctx->wr_curr_bio->page_count = 0;
|
|
}
|
|
sbio = wr_ctx->wr_curr_bio;
|
|
if (sbio->page_count == 0) {
|
|
struct bio *bio;
|
|
|
|
sbio->physical = spage->physical_for_dev_replace;
|
|
sbio->logical = spage->logical;
|
|
sbio->dev = wr_ctx->tgtdev;
|
|
bio = sbio->bio;
|
|
if (!bio) {
|
|
bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio);
|
|
if (!bio) {
|
|
mutex_unlock(&wr_ctx->wr_lock);
|
|
return -ENOMEM;
|
|
}
|
|
sbio->bio = bio;
|
|
}
|
|
|
|
bio->bi_private = sbio;
|
|
bio->bi_end_io = scrub_wr_bio_end_io;
|
|
bio->bi_bdev = sbio->dev->bdev;
|
|
bio->bi_iter.bi_sector = sbio->physical >> 9;
|
|
sbio->err = 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(&wr_ctx->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 == wr_ctx->pages_per_wr_bio)
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&wr_ctx->wr_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_wr_submit(struct scrub_ctx *sctx)
|
|
{
|
|
struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
|
|
struct scrub_bio *sbio;
|
|
|
|
if (!wr_ctx->wr_curr_bio)
|
|
return;
|
|
|
|
sbio = wr_ctx->wr_curr_bio;
|
|
wr_ctx->wr_curr_bio = NULL;
|
|
WARN_ON(!sbio->bio->bi_bdev);
|
|
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(WRITE, sbio->bio);
|
|
}
|
|
|
|
static void scrub_wr_bio_end_io(struct bio *bio, int err)
|
|
{
|
|
struct scrub_bio *sbio = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
|
|
|
|
sbio->err = err;
|
|
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->err) {
|
|
struct btrfs_dev_replace *dev_replace =
|
|
&sbio->sctx->dev_root->fs_info->dev_replace;
|
|
|
|
for (i = 0; i < sbio->page_count; i++) {
|
|
struct scrub_page *spage = sbio->pagev[i];
|
|
|
|
spage->io_error = 1;
|
|
btrfs_dev_replace_stats_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;
|
|
|
|
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;
|
|
int fail = 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->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))
|
|
fail = 1;
|
|
|
|
return fail;
|
|
}
|
|
|
|
static int scrub_checksum_tree_block(struct scrub_block *sblock)
|
|
{
|
|
struct scrub_ctx *sctx = sblock->sctx;
|
|
struct btrfs_header *h;
|
|
struct btrfs_root *root = sctx->dev_root;
|
|
struct btrfs_fs_info *fs_info = root->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;
|
|
int fail = 0;
|
|
int crc_fail = 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))
|
|
++fail;
|
|
|
|
if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h))
|
|
++fail;
|
|
|
|
if (!scrub_check_fsid(h->fsid, sblock->pagev[0]))
|
|
++fail;
|
|
|
|
if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
|
|
BTRFS_UUID_SIZE))
|
|
++fail;
|
|
|
|
len = sctx->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))
|
|
++crc_fail;
|
|
|
|
return fail || crc_fail;
|
|
}
|
|
|
|
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)
|
|
{
|
|
atomic_inc(&sblock->ref_count);
|
|
}
|
|
|
|
static void scrub_block_put(struct scrub_block *sblock)
|
|
{
|
|
if (atomic_dec_and_test(&sblock->ref_count)) {
|
|
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->ref_count);
|
|
}
|
|
|
|
static void scrub_page_put(struct scrub_page *spage)
|
|
{
|
|
if (atomic_dec_and_test(&spage->ref_count)) {
|
|
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);
|
|
|
|
if (!sbio->bio->bi_bdev) {
|
|
/*
|
|
* this case should not happen. If btrfs_map_block() is
|
|
* wrong, it could happen for dev-replace operations on
|
|
* missing devices when no mirrors are available, but in
|
|
* this case it should already fail the mount.
|
|
* This case is handled correctly (but _very_ slowly).
|
|
*/
|
|
printk_ratelimited(KERN_WARNING
|
|
"BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n");
|
|
bio_endio(sbio->bio, -EIO);
|
|
} else {
|
|
btrfsic_submit_bio(READ, 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(GFP_NOFS, sctx->pages_per_rd_bio);
|
|
if (!bio)
|
|
return -ENOMEM;
|
|
sbio->bio = bio;
|
|
}
|
|
|
|
bio->bi_private = sbio;
|
|
bio->bi_end_io = scrub_bio_end_io;
|
|
bio->bi_bdev = sbio->dev->bdev;
|
|
bio->bi_iter.bi_sector = sbio->physical >> 9;
|
|
sbio->err = 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 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_NOFS);
|
|
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 */
|
|
atomic_set(&sblock->ref_count, 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_NOFS);
|
|
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_NOFS);
|
|
if (!spage->page)
|
|
goto leave_nomem;
|
|
len -= l;
|
|
logical += l;
|
|
physical += l;
|
|
physical_for_dev_replace += 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;
|
|
}
|
|
}
|
|
|
|
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, int err)
|
|
{
|
|
struct scrub_bio *sbio = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
|
|
|
|
sbio->err = err;
|
|
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->err) {
|
|
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 &&
|
|
atomic_read(&sctx->wr_ctx.flush_all_writes)) {
|
|
mutex_lock(&sctx->wr_ctx.wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_ctx.wr_lock);
|
|
}
|
|
|
|
scrub_pending_bio_dec(sctx);
|
|
}
|
|
|
|
static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
|
|
unsigned long *bitmap,
|
|
u64 start, u64 len)
|
|
{
|
|
int offset;
|
|
int nsectors;
|
|
int sectorsize = sparity->sctx->dev_root->sectorsize;
|
|
|
|
if (len >= sparity->stripe_len) {
|
|
bitmap_set(bitmap, 0, sparity->nsectors);
|
|
return;
|
|
}
|
|
|
|
start -= sparity->logic_start;
|
|
offset = (int)do_div(start, sparity->stripe_len);
|
|
offset /= sectorsize;
|
|
nsectors = (int)len / sectorsize;
|
|
|
|
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, u64 len,
|
|
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 = ((u32)(logical - sum->bytenr)) / sctx->sectorsize;
|
|
num_sectors = sum->len / sctx->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, 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) {
|
|
blocksize = sctx->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) {
|
|
blocksize = sctx->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->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, l, csum);
|
|
if (have_csum == 0)
|
|
++sctx->stat.no_csum;
|
|
if (sctx->is_dev_replace && !have_csum) {
|
|
ret = copy_nocow_pages(sctx, logical, l,
|
|
mirror_num,
|
|
physical_for_dev_replace);
|
|
goto behind_scrub_pages;
|
|
}
|
|
}
|
|
ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
|
|
mirror_num, have_csum ? csum : NULL, 0,
|
|
physical_for_dev_replace);
|
|
behind_scrub_pages:
|
|
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_NOFS);
|
|
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 */
|
|
atomic_set(&sblock->ref_count, 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_NOFS);
|
|
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_NOFS);
|
|
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 (flags & BTRFS_EXTENT_FLAG_DATA) {
|
|
blocksize = sctx->sectorsize;
|
|
} else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
|
blocksize = sctx->nodesize;
|
|
} else {
|
|
blocksize = sctx->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, l, 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;
|
|
int stripe_index;
|
|
int 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 = *offset;
|
|
do_div(stripe_nr, map->stripe_len);
|
|
do_div(stripe_nr, nr_data_stripes(map));
|
|
|
|
/* Work out the disk rotation on this stripe-set */
|
|
rot = do_div(stripe_nr, map->num_stripes);
|
|
/* 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(struct bio *bio, int error)
|
|
{
|
|
struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private;
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
|
|
if (error)
|
|
bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
|
|
sparity->nsectors);
|
|
|
|
scrub_free_parity(sparity);
|
|
scrub_pending_bio_dec(sctx);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
|
|
{
|
|
struct scrub_ctx *sctx = sparity->sctx;
|
|
struct bio *bio;
|
|
struct btrfs_raid_bio *rbio;
|
|
struct scrub_page *spage;
|
|
struct btrfs_bio *bbio = NULL;
|
|
u64 *raid_map = 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 + 1;
|
|
ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE,
|
|
sparity->logic_start,
|
|
&length, &bbio, 0, &raid_map);
|
|
if (ret || !bbio || !raid_map)
|
|
goto bbio_out;
|
|
|
|
bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
|
|
if (!bio)
|
|
goto bbio_out;
|
|
|
|
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(sctx->dev_root, bio, bbio,
|
|
raid_map, length,
|
|
sparity->scrub_dev,
|
|
sparity->dbitmap,
|
|
sparity->nsectors);
|
|
if (!rbio)
|
|
goto rbio_out;
|
|
|
|
list_for_each_entry(spage, &sparity->spages, list)
|
|
raid56_parity_add_scrub_pages(rbio, spage->page,
|
|
spage->logical);
|
|
|
|
scrub_pending_bio_inc(sctx);
|
|
raid56_parity_submit_scrub_rbio(rbio);
|
|
return;
|
|
|
|
rbio_out:
|
|
bio_put(bio);
|
|
bbio_out:
|
|
kfree(bbio);
|
|
kfree(raid_map);
|
|
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) * (BITS_PER_LONG / 8);
|
|
}
|
|
|
|
static void scrub_parity_get(struct scrub_parity *sparity)
|
|
{
|
|
atomic_inc(&sparity->ref_count);
|
|
}
|
|
|
|
static void scrub_parity_put(struct scrub_parity *sparity)
|
|
{
|
|
if (!atomic_dec_and_test(&sparity->ref_count))
|
|
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->dev_root->fs_info;
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_root *csum_root = fs_info->csum_root;
|
|
struct btrfs_extent_item *extent;
|
|
u64 flags;
|
|
int ret;
|
|
int slot;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key key;
|
|
u64 generation;
|
|
u64 extent_logical;
|
|
u64 extent_physical;
|
|
u64 extent_len;
|
|
struct btrfs_device *extent_dev;
|
|
struct scrub_parity *sparity;
|
|
int nsectors;
|
|
int bitmap_len;
|
|
int extent_mirror_num;
|
|
int stop_loop = 0;
|
|
|
|
nsectors = map->stripe_len / root->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;
|
|
atomic_set(&sparity->ref_count, 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_METADATA_ITEM_KEY)
|
|
bytes = root->nodesize;
|
|
else
|
|
bytes = key.offset;
|
|
|
|
if (key.objectid + bytes <= logic_start)
|
|
goto next;
|
|
|
|
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
|
|
key.type != BTRFS_METADATA_ITEM_KEY)
|
|
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 (key.objectid < logic_start &&
|
|
(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
|
|
btrfs_err(fs_info,
|
|
"scrub: tree block %llu spanning stripes, ignored. logical=%llu",
|
|
key.objectid, logic_start);
|
|
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);
|
|
|
|
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_for_parity(sparity, extent_logical,
|
|
extent_len,
|
|
extent_physical,
|
|
extent_dev, flags,
|
|
generation,
|
|
extent_mirror_num);
|
|
if (ret)
|
|
goto out;
|
|
|
|
scrub_free_csums(sctx);
|
|
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 + 1);
|
|
scrub_parity_put(sparity);
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_ctx.wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_ctx.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,
|
|
int is_dev_replace)
|
|
{
|
|
struct btrfs_path *path, *ppath;
|
|
struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_root *csum_root = fs_info->csum_root;
|
|
struct btrfs_extent_item *extent;
|
|
struct blk_plug plug;
|
|
u64 flags;
|
|
int ret;
|
|
int slot;
|
|
u64 nstripes;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key key;
|
|
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_start;
|
|
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;
|
|
|
|
nstripes = length;
|
|
physical = map->stripes[num].physical;
|
|
offset = 0;
|
|
do_div(nstripes, map->stripe_len);
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
|
|
offset = map->stripe_len * num;
|
|
increment = map->stripe_len * map->num_stripes;
|
|
mirror_num = 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_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6)) {
|
|
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;
|
|
|
|
/*
|
|
* 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_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6)) {
|
|
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_start.objectid = logical;
|
|
key_start.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key_start.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_start, &key_end);
|
|
|
|
key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
|
|
key_start.type = BTRFS_EXTENT_CSUM_KEY;
|
|
key_start.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_start, &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) {
|
|
/* for raid56, we skip parity stripe */
|
|
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6)) {
|
|
ret = get_raid56_logic_offset(physical, num,
|
|
map, &logical, &stripe_logical);
|
|
logical += base;
|
|
if (ret) {
|
|
stripe_logical += base;
|
|
stripe_end = stripe_logical + increment - 1;
|
|
ret = scrub_raid56_parity(sctx, map, scrub_dev,
|
|
ppath, stripe_logical,
|
|
stripe_end);
|
|
if (ret)
|
|
goto out;
|
|
goto skip;
|
|
}
|
|
}
|
|
/*
|
|
* 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 */
|
|
atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_ctx.wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_ctx.wr_lock);
|
|
wait_event(sctx->list_wait,
|
|
atomic_read(&sctx->bios_in_flight) == 0);
|
|
atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
|
|
scrub_blocked_if_needed(fs_info);
|
|
}
|
|
|
|
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_METADATA_ITEM_KEY)
|
|
bytes = root->nodesize;
|
|
else
|
|
bytes = key.offset;
|
|
|
|
if (key.objectid + bytes <= logical)
|
|
goto next;
|
|
|
|
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
|
|
key.type != BTRFS_METADATA_ITEM_KEY)
|
|
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 (key.objectid < logical &&
|
|
(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
|
|
btrfs_err(fs_info,
|
|
"scrub: tree block %llu spanning "
|
|
"stripes, ignored. logical=%llu",
|
|
key.objectid, logical);
|
|
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 (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, logical,
|
|
logical + map->stripe_len - 1,
|
|
&sctx->csum_list, 1);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = scrub_extent(sctx, extent_logical, extent_len,
|
|
extent_physical, extent_dev, flags,
|
|
generation, extent_mirror_num,
|
|
extent_logical - logical + physical);
|
|
if (ret)
|
|
goto out;
|
|
|
|
scrub_free_csums(sctx);
|
|
if (extent_logical + extent_len <
|
|
key.objectid + bytes) {
|
|
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6)) {
|
|
/*
|
|
* 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 - 1;
|
|
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_ctx.wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_ctx.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_tree, u64 chunk_objectid,
|
|
u64 chunk_offset, u64 length,
|
|
u64 dev_offset, int is_dev_replace)
|
|
{
|
|
struct btrfs_mapping_tree *map_tree =
|
|
&sctx->dev_root->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)
|
|
return -EINVAL;
|
|
|
|
map = (struct map_lookup *)em->bdev;
|
|
if (em->start != chunk_offset)
|
|
goto out;
|
|
|
|
if (em->len < length)
|
|
goto out;
|
|
|
|
for (i = 0; i < map->num_stripes; ++i) {
|
|
if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
|
|
map->stripes[i].physical == dev_offset) {
|
|
ret = scrub_stripe(sctx, map, scrub_dev, i,
|
|
chunk_offset, length,
|
|
is_dev_replace);
|
|
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,
|
|
int is_dev_replace)
|
|
{
|
|
struct btrfs_dev_extent *dev_extent = NULL;
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *root = sctx->dev_root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 length;
|
|
u64 chunk_tree;
|
|
u64 chunk_objectid;
|
|
u64 chunk_offset;
|
|
int ret;
|
|
int slot;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_block_group_cache *cache;
|
|
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->reada = 2;
|
|
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)
|
|
break;
|
|
}
|
|
}
|
|
|
|
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_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
|
|
chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
|
|
chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
|
|
|
|
/*
|
|
* get a reference on the corresponding block group to prevent
|
|
* the chunk from going away while we scrub it
|
|
*/
|
|
cache = btrfs_lookup_block_group(fs_info, chunk_offset);
|
|
|
|
/* some chunks are removed but not committed to disk yet,
|
|
* continue scrubbing */
|
|
if (!cache)
|
|
goto skip;
|
|
|
|
dev_replace->cursor_right = found_key.offset + length;
|
|
dev_replace->cursor_left = found_key.offset;
|
|
dev_replace->item_needs_writeback = 1;
|
|
ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid,
|
|
chunk_offset, length, found_key.offset,
|
|
is_dev_replace);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
|
|
scrub_submit(sctx);
|
|
mutex_lock(&sctx->wr_ctx.wr_lock);
|
|
scrub_wr_submit(sctx);
|
|
mutex_unlock(&sctx->wr_ctx.wr_lock);
|
|
|
|
wait_event(sctx->list_wait,
|
|
atomic_read(&sctx->bios_in_flight) == 0);
|
|
atomic_inc(&fs_info->scrubs_paused);
|
|
wake_up(&fs_info->scrub_pause_wait);
|
|
|
|
/*
|
|
* 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);
|
|
atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
__scrub_blocked_if_needed(fs_info);
|
|
atomic_dec(&fs_info->scrubs_paused);
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
wake_up(&fs_info->scrub_pause_wait);
|
|
|
|
btrfs_put_block_group(cache);
|
|
if (ret)
|
|
break;
|
|
if (is_dev_replace &&
|
|
atomic64_read(&dev_replace->num_write_errors) > 0) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
if (sctx->stat.malloc_errors > 0) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
dev_replace->cursor_left = dev_replace->cursor_right;
|
|
dev_replace->item_needs_writeback = 1;
|
|
skip:
|
|
key.offset = found_key.offset + length;
|
|
btrfs_release_path(path);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
|
|
/*
|
|
* ret can still be 1 from search_slot or next_leaf,
|
|
* that's not an error
|
|
*/
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
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_root *root = sctx->dev_root;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
|
|
return -EIO;
|
|
|
|
/* Seed devices of a new filesystem has their own generation. */
|
|
if (scrub_dev->fs_devices != root->fs_info->fs_devices)
|
|
gen = scrub_dev->generation;
|
|
else
|
|
gen = root->fs_info->last_trans_committed;
|
|
|
|
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
|
bytenr = btrfs_sb_offset(i);
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >
|
|
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)
|
|
{
|
|
int ret = 0;
|
|
int flags = WQ_FREEZABLE | WQ_UNBOUND;
|
|
int max_active = fs_info->thread_pool_size;
|
|
|
|
if (fs_info->scrub_workers_refcnt == 0) {
|
|
if (is_dev_replace)
|
|
fs_info->scrub_workers =
|
|
btrfs_alloc_workqueue("btrfs-scrub", flags,
|
|
1, 4);
|
|
else
|
|
fs_info->scrub_workers =
|
|
btrfs_alloc_workqueue("btrfs-scrub", flags,
|
|
max_active, 4);
|
|
if (!fs_info->scrub_workers) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
fs_info->scrub_wr_completion_workers =
|
|
btrfs_alloc_workqueue("btrfs-scrubwrc", flags,
|
|
max_active, 2);
|
|
if (!fs_info->scrub_wr_completion_workers) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
fs_info->scrub_nocow_workers =
|
|
btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0);
|
|
if (!fs_info->scrub_nocow_workers) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
++fs_info->scrub_workers_refcnt;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (--fs_info->scrub_workers_refcnt == 0) {
|
|
btrfs_destroy_workqueue(fs_info->scrub_workers);
|
|
btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
|
|
btrfs_destroy_workqueue(fs_info->scrub_nocow_workers);
|
|
}
|
|
WARN_ON(fs_info->scrub_workers_refcnt < 0);
|
|
}
|
|
|
|
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;
|
|
struct rcu_string *name;
|
|
|
|
if (btrfs_fs_closing(fs_info))
|
|
return -EINVAL;
|
|
|
|
if (fs_info->chunk_root->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->chunk_root->nodesize, BTRFS_STRIPE_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (fs_info->chunk_root->sectorsize != PAGE_SIZE) {
|
|
/* not supported for data w/o checksums */
|
|
btrfs_err(fs_info,
|
|
"scrub: size assumption sectorsize != PAGE_SIZE "
|
|
"(%d != %lu) fails",
|
|
fs_info->chunk_root->sectorsize, PAGE_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (fs_info->chunk_root->nodesize >
|
|
PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
|
|
fs_info->chunk_root->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->chunk_root->nodesize,
|
|
SCRUB_MAX_PAGES_PER_BLOCK,
|
|
fs_info->chunk_root->sectorsize,
|
|
SCRUB_MAX_PAGES_PER_BLOCK);
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
dev = btrfs_find_device(fs_info, devid, NULL, NULL);
|
|
if (!dev || (dev->missing && !is_dev_replace)) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!is_dev_replace && !readonly && !dev->writeable) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
rcu_read_lock();
|
|
name = rcu_dereference(dev->name);
|
|
btrfs_err(fs_info, "scrub: device %s is not writable",
|
|
name->str);
|
|
rcu_read_unlock();
|
|
return -EROFS;
|
|
}
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
return -EIO;
|
|
}
|
|
|
|
btrfs_dev_replace_lock(&fs_info->dev_replace);
|
|
if (dev->scrub_device ||
|
|
(!is_dev_replace &&
|
|
btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
|
|
btrfs_dev_replace_unlock(&fs_info->dev_replace);
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
return -EINPROGRESS;
|
|
}
|
|
btrfs_dev_replace_unlock(&fs_info->dev_replace);
|
|
|
|
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);
|
|
return ret;
|
|
}
|
|
|
|
sctx = scrub_setup_ctx(dev, is_dev_replace);
|
|
if (IS_ERR(sctx)) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
scrub_workers_put(fs_info);
|
|
return PTR_ERR(sctx);
|
|
}
|
|
sctx->readonly = readonly;
|
|
dev->scrub_device = 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);
|
|
|
|
if (!is_dev_replace) {
|
|
/*
|
|
* 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,
|
|
is_dev_replace);
|
|
|
|
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));
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
dev->scrub_device = NULL;
|
|
scrub_workers_put(fs_info);
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
|
|
scrub_free_ctx(sctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_scrub_pause(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
atomic_inc(&fs_info->scrub_pause_req);
|
|
while (atomic_read(&fs_info->scrubs_paused) !=
|
|
atomic_read(&fs_info->scrubs_running)) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
wait_event(fs_info->scrub_pause_wait,
|
|
atomic_read(&fs_info->scrubs_paused) ==
|
|
atomic_read(&fs_info->scrubs_running));
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
}
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
}
|
|
|
|
void btrfs_scrub_continue(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
atomic_dec(&fs_info->scrub_pause_req);
|
|
wake_up(&fs_info->scrub_pause_wait);
|
|
}
|
|
|
|
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_fs_info *fs_info,
|
|
struct btrfs_device *dev)
|
|
{
|
|
struct scrub_ctx *sctx;
|
|
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
sctx = dev->scrub_device;
|
|
if (!sctx) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
return -ENOTCONN;
|
|
}
|
|
atomic_inc(&sctx->cancel_req);
|
|
while (dev->scrub_device) {
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
wait_event(fs_info->scrub_pause_wait,
|
|
dev->scrub_device == NULL);
|
|
mutex_lock(&fs_info->scrub_lock);
|
|
}
|
|
mutex_unlock(&fs_info->scrub_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
|
|
struct btrfs_scrub_progress *progress)
|
|
{
|
|
struct btrfs_device *dev;
|
|
struct scrub_ctx *sctx = NULL;
|
|
|
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
|
dev = btrfs_find_device(root->fs_info, devid, NULL, NULL);
|
|
if (dev)
|
|
sctx = dev->scrub_device;
|
|
if (sctx)
|
|
memcpy(progress, &sctx->stat, sizeof(*progress));
|
|
mutex_unlock(&root->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, READ, extent_logical,
|
|
&mapped_length, &bbio, 0);
|
|
if (ret || !bbio || mapped_length < extent_len ||
|
|
!bbio->stripes[0].dev->bdev) {
|
|
kfree(bbio);
|
|
return;
|
|
}
|
|
|
|
*extent_physical = bbio->stripes[0].physical;
|
|
*extent_mirror_num = bbio->mirror_num;
|
|
*extent_dev = bbio->stripes[0].dev;
|
|
kfree(bbio);
|
|
}
|
|
|
|
static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
|
|
struct scrub_wr_ctx *wr_ctx,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_device *dev,
|
|
int is_dev_replace)
|
|
{
|
|
WARN_ON(wr_ctx->wr_curr_bio != NULL);
|
|
|
|
mutex_init(&wr_ctx->wr_lock);
|
|
wr_ctx->wr_curr_bio = NULL;
|
|
if (!is_dev_replace)
|
|
return 0;
|
|
|
|
WARN_ON(!dev->bdev);
|
|
wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO,
|
|
bio_get_nr_vecs(dev->bdev));
|
|
wr_ctx->tgtdev = dev;
|
|
atomic_set(&wr_ctx->flush_all_writes, 0);
|
|
return 0;
|
|
}
|
|
|
|
static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
|
|
{
|
|
mutex_lock(&wr_ctx->wr_lock);
|
|
kfree(wr_ctx->wr_curr_bio);
|
|
wr_ctx->wr_curr_bio = NULL;
|
|
mutex_unlock(&wr_ctx->wr_lock);
|
|
}
|
|
|
|
static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
|
|
int mirror_num, u64 physical_for_dev_replace)
|
|
{
|
|
struct scrub_copy_nocow_ctx *nocow_ctx;
|
|
struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
|
|
|
|
nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
|
|
if (!nocow_ctx) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
scrub_pending_trans_workers_inc(sctx);
|
|
|
|
nocow_ctx->sctx = sctx;
|
|
nocow_ctx->logical = logical;
|
|
nocow_ctx->len = len;
|
|
nocow_ctx->mirror_num = mirror_num;
|
|
nocow_ctx->physical_for_dev_replace = physical_for_dev_replace;
|
|
btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper,
|
|
copy_nocow_pages_worker, NULL, NULL);
|
|
INIT_LIST_HEAD(&nocow_ctx->inodes);
|
|
btrfs_queue_work(fs_info->scrub_nocow_workers,
|
|
&nocow_ctx->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx)
|
|
{
|
|
struct scrub_copy_nocow_ctx *nocow_ctx = ctx;
|
|
struct scrub_nocow_inode *nocow_inode;
|
|
|
|
nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS);
|
|
if (!nocow_inode)
|
|
return -ENOMEM;
|
|
nocow_inode->inum = inum;
|
|
nocow_inode->offset = offset;
|
|
nocow_inode->root = root;
|
|
list_add_tail(&nocow_inode->list, &nocow_ctx->inodes);
|
|
return 0;
|
|
}
|
|
|
|
#define COPY_COMPLETE 1
|
|
|
|
static void copy_nocow_pages_worker(struct btrfs_work *work)
|
|
{
|
|
struct scrub_copy_nocow_ctx *nocow_ctx =
|
|
container_of(work, struct scrub_copy_nocow_ctx, work);
|
|
struct scrub_ctx *sctx = nocow_ctx->sctx;
|
|
u64 logical = nocow_ctx->logical;
|
|
u64 len = nocow_ctx->len;
|
|
int mirror_num = nocow_ctx->mirror_num;
|
|
u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
|
|
int ret;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *root;
|
|
int not_written = 0;
|
|
|
|
fs_info = sctx->dev_root->fs_info;
|
|
root = fs_info->extent_root;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
not_written = 1;
|
|
goto out;
|
|
}
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
not_written = 1;
|
|
goto out;
|
|
}
|
|
|
|
ret = iterate_inodes_from_logical(logical, fs_info, path,
|
|
record_inode_for_nocow, nocow_ctx);
|
|
if (ret != 0 && ret != -ENOENT) {
|
|
btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, "
|
|
"phys %llu, len %llu, mir %u, ret %d",
|
|
logical, physical_for_dev_replace, len, mirror_num,
|
|
ret);
|
|
not_written = 1;
|
|
goto out;
|
|
}
|
|
|
|
btrfs_end_transaction(trans, root);
|
|
trans = NULL;
|
|
while (!list_empty(&nocow_ctx->inodes)) {
|
|
struct scrub_nocow_inode *entry;
|
|
entry = list_first_entry(&nocow_ctx->inodes,
|
|
struct scrub_nocow_inode,
|
|
list);
|
|
list_del_init(&entry->list);
|
|
ret = copy_nocow_pages_for_inode(entry->inum, entry->offset,
|
|
entry->root, nocow_ctx);
|
|
kfree(entry);
|
|
if (ret == COPY_COMPLETE) {
|
|
ret = 0;
|
|
break;
|
|
} else if (ret) {
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
while (!list_empty(&nocow_ctx->inodes)) {
|
|
struct scrub_nocow_inode *entry;
|
|
entry = list_first_entry(&nocow_ctx->inodes,
|
|
struct scrub_nocow_inode,
|
|
list);
|
|
list_del_init(&entry->list);
|
|
kfree(entry);
|
|
}
|
|
if (trans && !IS_ERR(trans))
|
|
btrfs_end_transaction(trans, root);
|
|
if (not_written)
|
|
btrfs_dev_replace_stats_inc(&fs_info->dev_replace.
|
|
num_uncorrectable_read_errors);
|
|
|
|
btrfs_free_path(path);
|
|
kfree(nocow_ctx);
|
|
|
|
scrub_pending_trans_workers_dec(sctx);
|
|
}
|
|
|
|
static int check_extent_to_block(struct inode *inode, u64 start, u64 len,
|
|
u64 logical)
|
|
{
|
|
struct extent_state *cached_state = NULL;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct extent_io_tree *io_tree;
|
|
struct extent_map *em;
|
|
u64 lockstart = start, lockend = start + len - 1;
|
|
int ret = 0;
|
|
|
|
io_tree = &BTRFS_I(inode)->io_tree;
|
|
|
|
lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state);
|
|
ordered = btrfs_lookup_ordered_range(inode, lockstart, len);
|
|
if (ordered) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
ret = 1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
|
|
if (IS_ERR(em)) {
|
|
ret = PTR_ERR(em);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* This extent does not actually cover the logical extent anymore,
|
|
* move on to the next inode.
|
|
*/
|
|
if (em->block_start > logical ||
|
|
em->block_start + em->block_len < logical + len) {
|
|
free_extent_map(em);
|
|
ret = 1;
|
|
goto out_unlock;
|
|
}
|
|
free_extent_map(em);
|
|
|
|
out_unlock:
|
|
unlock_extent_cached(io_tree, lockstart, lockend, &cached_state,
|
|
GFP_NOFS);
|
|
return ret;
|
|
}
|
|
|
|
static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
|
|
struct scrub_copy_nocow_ctx *nocow_ctx)
|
|
{
|
|
struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
|
|
struct btrfs_key key;
|
|
struct inode *inode;
|
|
struct page *page;
|
|
struct btrfs_root *local_root;
|
|
struct extent_io_tree *io_tree;
|
|
u64 physical_for_dev_replace;
|
|
u64 nocow_ctx_logical;
|
|
u64 len = nocow_ctx->len;
|
|
unsigned long index;
|
|
int srcu_index;
|
|
int ret = 0;
|
|
int err = 0;
|
|
|
|
key.objectid = root;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
|
|
|
|
local_root = btrfs_read_fs_root_no_name(fs_info, &key);
|
|
if (IS_ERR(local_root)) {
|
|
srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
|
|
return PTR_ERR(local_root);
|
|
}
|
|
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.objectid = inum;
|
|
key.offset = 0;
|
|
inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
|
|
srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
|
|
/* Avoid truncate/dio/punch hole.. */
|
|
mutex_lock(&inode->i_mutex);
|
|
inode_dio_wait(inode);
|
|
|
|
physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
|
|
io_tree = &BTRFS_I(inode)->io_tree;
|
|
nocow_ctx_logical = nocow_ctx->logical;
|
|
|
|
ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical);
|
|
if (ret) {
|
|
ret = ret > 0 ? 0 : ret;
|
|
goto out;
|
|
}
|
|
|
|
while (len >= PAGE_CACHE_SIZE) {
|
|
index = offset >> PAGE_CACHE_SHIFT;
|
|
again:
|
|
page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
|
|
if (!page) {
|
|
btrfs_err(fs_info, "find_or_create_page() failed");
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (PageUptodate(page)) {
|
|
if (PageDirty(page))
|
|
goto next_page;
|
|
} else {
|
|
ClearPageError(page);
|
|
err = extent_read_full_page(io_tree, page,
|
|
btrfs_get_extent,
|
|
nocow_ctx->mirror_num);
|
|
if (err) {
|
|
ret = err;
|
|
goto next_page;
|
|
}
|
|
|
|
lock_page(page);
|
|
/*
|
|
* If the page has been remove from the page cache,
|
|
* the data on it is meaningless, because it may be
|
|
* old one, the new data may be written into the new
|
|
* page in the page cache.
|
|
*/
|
|
if (page->mapping != inode->i_mapping) {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
goto again;
|
|
}
|
|
if (!PageUptodate(page)) {
|
|
ret = -EIO;
|
|
goto next_page;
|
|
}
|
|
}
|
|
|
|
ret = check_extent_to_block(inode, offset, len,
|
|
nocow_ctx_logical);
|
|
if (ret) {
|
|
ret = ret > 0 ? 0 : ret;
|
|
goto next_page;
|
|
}
|
|
|
|
err = write_page_nocow(nocow_ctx->sctx,
|
|
physical_for_dev_replace, page);
|
|
if (err)
|
|
ret = err;
|
|
next_page:
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
offset += PAGE_CACHE_SIZE;
|
|
physical_for_dev_replace += PAGE_CACHE_SIZE;
|
|
nocow_ctx_logical += PAGE_CACHE_SIZE;
|
|
len -= PAGE_CACHE_SIZE;
|
|
}
|
|
ret = COPY_COMPLETE;
|
|
out:
|
|
mutex_unlock(&inode->i_mutex);
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
static int write_page_nocow(struct scrub_ctx *sctx,
|
|
u64 physical_for_dev_replace, struct page *page)
|
|
{
|
|
struct bio *bio;
|
|
struct btrfs_device *dev;
|
|
int ret;
|
|
|
|
dev = sctx->wr_ctx.tgtdev;
|
|
if (!dev)
|
|
return -EIO;
|
|
if (!dev->bdev) {
|
|
printk_ratelimited(KERN_WARNING
|
|
"BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n");
|
|
return -EIO;
|
|
}
|
|
bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
|
|
if (!bio) {
|
|
spin_lock(&sctx->stat_lock);
|
|
sctx->stat.malloc_errors++;
|
|
spin_unlock(&sctx->stat_lock);
|
|
return -ENOMEM;
|
|
}
|
|
bio->bi_iter.bi_size = 0;
|
|
bio->bi_iter.bi_sector = physical_for_dev_replace >> 9;
|
|
bio->bi_bdev = dev->bdev;
|
|
ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
|
|
if (ret != PAGE_CACHE_SIZE) {
|
|
leave_with_eio:
|
|
bio_put(bio);
|
|
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
|
|
return -EIO;
|
|
}
|
|
|
|
if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
|
|
goto leave_with_eio;
|
|
|
|
bio_put(bio);
|
|
return 0;
|
|
}
|