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![Qu Wenruo](/assets/img/avatar_default.png)
For Btrfs RAID56, we have a caching system for btrfs raid bios (rbio). We call cache_rbio_pages() to mark a qualified rbio ready for cache. The timing happens at: - finish_rmw() At this timing, we have already read all necessary sectors, along with the rbio sectors, we have covered all data stripes. - __raid_recover_end_io() At this timing, we have rebuild the rbio, thus all data sectors involved (either from stripe or bio list) are uptodate now. Thus at the timing of cache_rbio_pages(), we should have all data sectors uptodate. This patch will make it explicit that all data sectors are uptodate at cache_rbio_pages() timing, mostly to prepare for the incoming verification at RMW time. This patch will add: - Extra ASSERT()s in cache_rbio_pages() This is to make sure all data sectors, which are not covered by bio, are already uptodate. - Extra ASSERT()s in steal_rbio() Since only cached rbio can be stolen, thus every data sector should already be uptodate in the source rbio. - Update __raid_recover_end_io() to update recovered sector->uptodate Previously __raid_recover_end_io() will only mark failed sectors uptodate if it's doing an RMW. But this can trigger new ASSERT()s, as for recovery case, a recovered failed sector will not be marked uptodate, and trigger ASSERT() in later cache_rbio_pages() call. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2794 lines
73 KiB
C
2794 lines
73 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2012 Fusion-io All rights reserved.
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* Copyright (C) 2012 Intel Corp. All rights reserved.
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*/
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#include <linux/sched.h>
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#include <linux/bio.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/raid/pq.h>
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#include <linux/hash.h>
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#include <linux/list_sort.h>
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#include <linux/raid/xor.h>
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#include <linux/mm.h>
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#include "misc.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "volumes.h"
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#include "raid56.h"
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#include "async-thread.h"
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/* set when additional merges to this rbio are not allowed */
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#define RBIO_RMW_LOCKED_BIT 1
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/*
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* set when this rbio is sitting in the hash, but it is just a cache
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* of past RMW
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*/
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#define RBIO_CACHE_BIT 2
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/*
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* set when it is safe to trust the stripe_pages for caching
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*/
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#define RBIO_CACHE_READY_BIT 3
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#define RBIO_CACHE_SIZE 1024
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#define BTRFS_STRIPE_HASH_TABLE_BITS 11
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/* Used by the raid56 code to lock stripes for read/modify/write */
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struct btrfs_stripe_hash {
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struct list_head hash_list;
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spinlock_t lock;
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};
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/* Used by the raid56 code to lock stripes for read/modify/write */
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struct btrfs_stripe_hash_table {
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struct list_head stripe_cache;
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spinlock_t cache_lock;
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int cache_size;
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struct btrfs_stripe_hash table[];
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};
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/*
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* A bvec like structure to present a sector inside a page.
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*
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* Unlike bvec we don't need bvlen, as it's fixed to sectorsize.
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*/
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struct sector_ptr {
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struct page *page;
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unsigned int pgoff:24;
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unsigned int uptodate:8;
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};
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static int __raid56_parity_recover(struct btrfs_raid_bio *rbio);
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static noinline void finish_rmw(struct btrfs_raid_bio *rbio);
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static void rmw_work(struct work_struct *work);
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static void read_rebuild_work(struct work_struct *work);
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static int fail_bio_stripe(struct btrfs_raid_bio *rbio, struct bio *bio);
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static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed);
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static void index_rbio_pages(struct btrfs_raid_bio *rbio);
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static int alloc_rbio_pages(struct btrfs_raid_bio *rbio);
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static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
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int need_check);
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static void scrub_parity_work(struct work_struct *work);
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static void free_raid_bio_pointers(struct btrfs_raid_bio *rbio)
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{
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kfree(rbio->stripe_pages);
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kfree(rbio->bio_sectors);
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kfree(rbio->stripe_sectors);
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kfree(rbio->finish_pointers);
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}
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static void free_raid_bio(struct btrfs_raid_bio *rbio)
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{
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int i;
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if (!refcount_dec_and_test(&rbio->refs))
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return;
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WARN_ON(!list_empty(&rbio->stripe_cache));
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WARN_ON(!list_empty(&rbio->hash_list));
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WARN_ON(!bio_list_empty(&rbio->bio_list));
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for (i = 0; i < rbio->nr_pages; i++) {
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if (rbio->stripe_pages[i]) {
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__free_page(rbio->stripe_pages[i]);
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rbio->stripe_pages[i] = NULL;
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}
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}
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btrfs_put_bioc(rbio->bioc);
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free_raid_bio_pointers(rbio);
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kfree(rbio);
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}
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static void start_async_work(struct btrfs_raid_bio *rbio, work_func_t work_func)
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{
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INIT_WORK(&rbio->work, work_func);
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queue_work(rbio->bioc->fs_info->rmw_workers, &rbio->work);
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}
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/*
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* the stripe hash table is used for locking, and to collect
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* bios in hopes of making a full stripe
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*/
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int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info)
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{
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struct btrfs_stripe_hash_table *table;
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struct btrfs_stripe_hash_table *x;
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struct btrfs_stripe_hash *cur;
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struct btrfs_stripe_hash *h;
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int num_entries = 1 << BTRFS_STRIPE_HASH_TABLE_BITS;
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int i;
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if (info->stripe_hash_table)
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return 0;
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/*
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* The table is large, starting with order 4 and can go as high as
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* order 7 in case lock debugging is turned on.
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*
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* Try harder to allocate and fallback to vmalloc to lower the chance
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* of a failing mount.
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*/
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table = kvzalloc(struct_size(table, table, num_entries), GFP_KERNEL);
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if (!table)
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return -ENOMEM;
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spin_lock_init(&table->cache_lock);
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INIT_LIST_HEAD(&table->stripe_cache);
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h = table->table;
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for (i = 0; i < num_entries; i++) {
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cur = h + i;
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INIT_LIST_HEAD(&cur->hash_list);
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spin_lock_init(&cur->lock);
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}
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x = cmpxchg(&info->stripe_hash_table, NULL, table);
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kvfree(x);
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return 0;
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}
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/*
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* caching an rbio means to copy anything from the
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* bio_sectors array into the stripe_pages array. We
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* use the page uptodate bit in the stripe cache array
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* to indicate if it has valid data
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*
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* once the caching is done, we set the cache ready
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* bit.
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*/
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static void cache_rbio_pages(struct btrfs_raid_bio *rbio)
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{
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int i;
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int ret;
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ret = alloc_rbio_pages(rbio);
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if (ret)
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return;
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for (i = 0; i < rbio->nr_sectors; i++) {
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/* Some range not covered by bio (partial write), skip it */
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if (!rbio->bio_sectors[i].page) {
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/*
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* Even if the sector is not covered by bio, if it is
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* a data sector it should still be uptodate as it is
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* read from disk.
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*/
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if (i < rbio->nr_data * rbio->stripe_nsectors)
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ASSERT(rbio->stripe_sectors[i].uptodate);
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continue;
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}
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ASSERT(rbio->stripe_sectors[i].page);
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memcpy_page(rbio->stripe_sectors[i].page,
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rbio->stripe_sectors[i].pgoff,
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rbio->bio_sectors[i].page,
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rbio->bio_sectors[i].pgoff,
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rbio->bioc->fs_info->sectorsize);
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rbio->stripe_sectors[i].uptodate = 1;
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}
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set_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
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}
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/*
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* we hash on the first logical address of the stripe
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*/
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static int rbio_bucket(struct btrfs_raid_bio *rbio)
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{
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u64 num = rbio->bioc->raid_map[0];
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/*
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* we shift down quite a bit. We're using byte
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* addressing, and most of the lower bits are zeros.
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* This tends to upset hash_64, and it consistently
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* returns just one or two different values.
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*
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* shifting off the lower bits fixes things.
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*/
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return hash_64(num >> 16, BTRFS_STRIPE_HASH_TABLE_BITS);
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}
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static bool full_page_sectors_uptodate(struct btrfs_raid_bio *rbio,
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unsigned int page_nr)
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{
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const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
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const u32 sectors_per_page = PAGE_SIZE / sectorsize;
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int i;
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ASSERT(page_nr < rbio->nr_pages);
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for (i = sectors_per_page * page_nr;
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i < sectors_per_page * page_nr + sectors_per_page;
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i++) {
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if (!rbio->stripe_sectors[i].uptodate)
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return false;
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}
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return true;
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}
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/*
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* Update the stripe_sectors[] array to use correct page and pgoff
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*
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* Should be called every time any page pointer in stripes_pages[] got modified.
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*/
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static void index_stripe_sectors(struct btrfs_raid_bio *rbio)
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{
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const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
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u32 offset;
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int i;
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for (i = 0, offset = 0; i < rbio->nr_sectors; i++, offset += sectorsize) {
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int page_index = offset >> PAGE_SHIFT;
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ASSERT(page_index < rbio->nr_pages);
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rbio->stripe_sectors[i].page = rbio->stripe_pages[page_index];
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rbio->stripe_sectors[i].pgoff = offset_in_page(offset);
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}
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}
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static void steal_rbio_page(struct btrfs_raid_bio *src,
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struct btrfs_raid_bio *dest, int page_nr)
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{
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const u32 sectorsize = src->bioc->fs_info->sectorsize;
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const u32 sectors_per_page = PAGE_SIZE / sectorsize;
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int i;
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if (dest->stripe_pages[page_nr])
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__free_page(dest->stripe_pages[page_nr]);
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dest->stripe_pages[page_nr] = src->stripe_pages[page_nr];
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src->stripe_pages[page_nr] = NULL;
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/* Also update the sector->uptodate bits. */
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for (i = sectors_per_page * page_nr;
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i < sectors_per_page * page_nr + sectors_per_page; i++)
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dest->stripe_sectors[i].uptodate = true;
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}
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static bool is_data_stripe_page(struct btrfs_raid_bio *rbio, int page_nr)
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{
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const int sector_nr = (page_nr << PAGE_SHIFT) >>
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rbio->bioc->fs_info->sectorsize_bits;
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/*
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* We have ensured PAGE_SIZE is aligned with sectorsize, thus
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* we won't have a page which is half data half parity.
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*
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* Thus if the first sector of the page belongs to data stripes, then
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* the full page belongs to data stripes.
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*/
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return (sector_nr < rbio->nr_data * rbio->stripe_nsectors);
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}
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/*
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* Stealing an rbio means taking all the uptodate pages from the stripe array
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* in the source rbio and putting them into the destination rbio.
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*
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* This will also update the involved stripe_sectors[] which are referring to
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* the old pages.
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*/
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static void steal_rbio(struct btrfs_raid_bio *src, struct btrfs_raid_bio *dest)
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{
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int i;
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if (!test_bit(RBIO_CACHE_READY_BIT, &src->flags))
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return;
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for (i = 0; i < dest->nr_pages; i++) {
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struct page *p = src->stripe_pages[i];
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/*
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* We don't need to steal P/Q pages as they will always be
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* regenerated for RMW or full write anyway.
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*/
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if (!is_data_stripe_page(src, i))
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continue;
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/*
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* If @src already has RBIO_CACHE_READY_BIT, it should have
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* all data stripe pages present and uptodate.
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*/
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ASSERT(p);
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ASSERT(full_page_sectors_uptodate(src, i));
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steal_rbio_page(src, dest, i);
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}
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index_stripe_sectors(dest);
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index_stripe_sectors(src);
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}
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/*
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* merging means we take the bio_list from the victim and
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* splice it into the destination. The victim should
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* be discarded afterwards.
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*
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* must be called with dest->rbio_list_lock held
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*/
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static void merge_rbio(struct btrfs_raid_bio *dest,
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struct btrfs_raid_bio *victim)
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{
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bio_list_merge(&dest->bio_list, &victim->bio_list);
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dest->bio_list_bytes += victim->bio_list_bytes;
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/* Also inherit the bitmaps from @victim. */
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bitmap_or(&dest->dbitmap, &victim->dbitmap, &dest->dbitmap,
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dest->stripe_nsectors);
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bio_list_init(&victim->bio_list);
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}
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/*
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* used to prune items that are in the cache. The caller
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* must hold the hash table lock.
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*/
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static void __remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
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{
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int bucket = rbio_bucket(rbio);
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struct btrfs_stripe_hash_table *table;
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struct btrfs_stripe_hash *h;
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int freeit = 0;
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/*
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* check the bit again under the hash table lock.
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*/
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if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
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return;
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table = rbio->bioc->fs_info->stripe_hash_table;
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h = table->table + bucket;
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/* hold the lock for the bucket because we may be
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* removing it from the hash table
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*/
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spin_lock(&h->lock);
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/*
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* hold the lock for the bio list because we need
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* to make sure the bio list is empty
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*/
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spin_lock(&rbio->bio_list_lock);
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if (test_and_clear_bit(RBIO_CACHE_BIT, &rbio->flags)) {
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list_del_init(&rbio->stripe_cache);
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table->cache_size -= 1;
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freeit = 1;
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/* if the bio list isn't empty, this rbio is
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* still involved in an IO. We take it out
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* of the cache list, and drop the ref that
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* was held for the list.
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*
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* If the bio_list was empty, we also remove
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* the rbio from the hash_table, and drop
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* the corresponding ref
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*/
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if (bio_list_empty(&rbio->bio_list)) {
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if (!list_empty(&rbio->hash_list)) {
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list_del_init(&rbio->hash_list);
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refcount_dec(&rbio->refs);
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BUG_ON(!list_empty(&rbio->plug_list));
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}
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}
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}
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spin_unlock(&rbio->bio_list_lock);
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spin_unlock(&h->lock);
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if (freeit)
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free_raid_bio(rbio);
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}
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/*
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* prune a given rbio from the cache
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*/
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static void remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
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{
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struct btrfs_stripe_hash_table *table;
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unsigned long flags;
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if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
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return;
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table = rbio->bioc->fs_info->stripe_hash_table;
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spin_lock_irqsave(&table->cache_lock, flags);
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__remove_rbio_from_cache(rbio);
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spin_unlock_irqrestore(&table->cache_lock, flags);
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}
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/*
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* remove everything in the cache
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*/
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static void btrfs_clear_rbio_cache(struct btrfs_fs_info *info)
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{
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struct btrfs_stripe_hash_table *table;
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unsigned long flags;
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struct btrfs_raid_bio *rbio;
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table = info->stripe_hash_table;
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spin_lock_irqsave(&table->cache_lock, flags);
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while (!list_empty(&table->stripe_cache)) {
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rbio = list_entry(table->stripe_cache.next,
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struct btrfs_raid_bio,
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stripe_cache);
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__remove_rbio_from_cache(rbio);
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}
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spin_unlock_irqrestore(&table->cache_lock, flags);
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}
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/*
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* remove all cached entries and free the hash table
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* used by unmount
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*/
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void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info)
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{
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if (!info->stripe_hash_table)
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return;
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btrfs_clear_rbio_cache(info);
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kvfree(info->stripe_hash_table);
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info->stripe_hash_table = NULL;
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}
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/*
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* insert an rbio into the stripe cache. It
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* must have already been prepared by calling
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* cache_rbio_pages
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*
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* If this rbio was already cached, it gets
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* moved to the front of the lru.
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*
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* If the size of the rbio cache is too big, we
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* prune an item.
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*/
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static void cache_rbio(struct btrfs_raid_bio *rbio)
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{
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struct btrfs_stripe_hash_table *table;
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unsigned long flags;
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if (!test_bit(RBIO_CACHE_READY_BIT, &rbio->flags))
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return;
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table = rbio->bioc->fs_info->stripe_hash_table;
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spin_lock_irqsave(&table->cache_lock, flags);
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spin_lock(&rbio->bio_list_lock);
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/* bump our ref if we were not in the list before */
|
|
if (!test_and_set_bit(RBIO_CACHE_BIT, &rbio->flags))
|
|
refcount_inc(&rbio->refs);
|
|
|
|
if (!list_empty(&rbio->stripe_cache)){
|
|
list_move(&rbio->stripe_cache, &table->stripe_cache);
|
|
} else {
|
|
list_add(&rbio->stripe_cache, &table->stripe_cache);
|
|
table->cache_size += 1;
|
|
}
|
|
|
|
spin_unlock(&rbio->bio_list_lock);
|
|
|
|
if (table->cache_size > RBIO_CACHE_SIZE) {
|
|
struct btrfs_raid_bio *found;
|
|
|
|
found = list_entry(table->stripe_cache.prev,
|
|
struct btrfs_raid_bio,
|
|
stripe_cache);
|
|
|
|
if (found != rbio)
|
|
__remove_rbio_from_cache(found);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&table->cache_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* helper function to run the xor_blocks api. It is only
|
|
* able to do MAX_XOR_BLOCKS at a time, so we need to
|
|
* loop through.
|
|
*/
|
|
static void run_xor(void **pages, int src_cnt, ssize_t len)
|
|
{
|
|
int src_off = 0;
|
|
int xor_src_cnt = 0;
|
|
void *dest = pages[src_cnt];
|
|
|
|
while(src_cnt > 0) {
|
|
xor_src_cnt = min(src_cnt, MAX_XOR_BLOCKS);
|
|
xor_blocks(xor_src_cnt, len, dest, pages + src_off);
|
|
|
|
src_cnt -= xor_src_cnt;
|
|
src_off += xor_src_cnt;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns true if the bio list inside this rbio covers an entire stripe (no
|
|
* rmw required).
|
|
*/
|
|
static int rbio_is_full(struct btrfs_raid_bio *rbio)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long size = rbio->bio_list_bytes;
|
|
int ret = 1;
|
|
|
|
spin_lock_irqsave(&rbio->bio_list_lock, flags);
|
|
if (size != rbio->nr_data * BTRFS_STRIPE_LEN)
|
|
ret = 0;
|
|
BUG_ON(size > rbio->nr_data * BTRFS_STRIPE_LEN);
|
|
spin_unlock_irqrestore(&rbio->bio_list_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* returns 1 if it is safe to merge two rbios together.
|
|
* The merging is safe if the two rbios correspond to
|
|
* the same stripe and if they are both going in the same
|
|
* direction (read vs write), and if neither one is
|
|
* locked for final IO
|
|
*
|
|
* The caller is responsible for locking such that
|
|
* rmw_locked is safe to test
|
|
*/
|
|
static int rbio_can_merge(struct btrfs_raid_bio *last,
|
|
struct btrfs_raid_bio *cur)
|
|
{
|
|
if (test_bit(RBIO_RMW_LOCKED_BIT, &last->flags) ||
|
|
test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags))
|
|
return 0;
|
|
|
|
/*
|
|
* we can't merge with cached rbios, since the
|
|
* idea is that when we merge the destination
|
|
* rbio is going to run our IO for us. We can
|
|
* steal from cached rbios though, other functions
|
|
* handle that.
|
|
*/
|
|
if (test_bit(RBIO_CACHE_BIT, &last->flags) ||
|
|
test_bit(RBIO_CACHE_BIT, &cur->flags))
|
|
return 0;
|
|
|
|
if (last->bioc->raid_map[0] != cur->bioc->raid_map[0])
|
|
return 0;
|
|
|
|
/* we can't merge with different operations */
|
|
if (last->operation != cur->operation)
|
|
return 0;
|
|
/*
|
|
* We've need read the full stripe from the drive.
|
|
* check and repair the parity and write the new results.
|
|
*
|
|
* We're not allowed to add any new bios to the
|
|
* bio list here, anyone else that wants to
|
|
* change this stripe needs to do their own rmw.
|
|
*/
|
|
if (last->operation == BTRFS_RBIO_PARITY_SCRUB)
|
|
return 0;
|
|
|
|
if (last->operation == BTRFS_RBIO_REBUILD_MISSING)
|
|
return 0;
|
|
|
|
if (last->operation == BTRFS_RBIO_READ_REBUILD) {
|
|
int fa = last->faila;
|
|
int fb = last->failb;
|
|
int cur_fa = cur->faila;
|
|
int cur_fb = cur->failb;
|
|
|
|
if (last->faila >= last->failb) {
|
|
fa = last->failb;
|
|
fb = last->faila;
|
|
}
|
|
|
|
if (cur->faila >= cur->failb) {
|
|
cur_fa = cur->failb;
|
|
cur_fb = cur->faila;
|
|
}
|
|
|
|
if (fa != cur_fa || fb != cur_fb)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int rbio_stripe_sector_index(const struct btrfs_raid_bio *rbio,
|
|
unsigned int stripe_nr,
|
|
unsigned int sector_nr)
|
|
{
|
|
ASSERT(stripe_nr < rbio->real_stripes);
|
|
ASSERT(sector_nr < rbio->stripe_nsectors);
|
|
|
|
return stripe_nr * rbio->stripe_nsectors + sector_nr;
|
|
}
|
|
|
|
/* Return a sector from rbio->stripe_sectors, not from the bio list */
|
|
static struct sector_ptr *rbio_stripe_sector(const struct btrfs_raid_bio *rbio,
|
|
unsigned int stripe_nr,
|
|
unsigned int sector_nr)
|
|
{
|
|
return &rbio->stripe_sectors[rbio_stripe_sector_index(rbio, stripe_nr,
|
|
sector_nr)];
|
|
}
|
|
|
|
/* Grab a sector inside P stripe */
|
|
static struct sector_ptr *rbio_pstripe_sector(const struct btrfs_raid_bio *rbio,
|
|
unsigned int sector_nr)
|
|
{
|
|
return rbio_stripe_sector(rbio, rbio->nr_data, sector_nr);
|
|
}
|
|
|
|
/* Grab a sector inside Q stripe, return NULL if not RAID6 */
|
|
static struct sector_ptr *rbio_qstripe_sector(const struct btrfs_raid_bio *rbio,
|
|
unsigned int sector_nr)
|
|
{
|
|
if (rbio->nr_data + 1 == rbio->real_stripes)
|
|
return NULL;
|
|
return rbio_stripe_sector(rbio, rbio->nr_data + 1, sector_nr);
|
|
}
|
|
|
|
/*
|
|
* The first stripe in the table for a logical address
|
|
* has the lock. rbios are added in one of three ways:
|
|
*
|
|
* 1) Nobody has the stripe locked yet. The rbio is given
|
|
* the lock and 0 is returned. The caller must start the IO
|
|
* themselves.
|
|
*
|
|
* 2) Someone has the stripe locked, but we're able to merge
|
|
* with the lock owner. The rbio is freed and the IO will
|
|
* start automatically along with the existing rbio. 1 is returned.
|
|
*
|
|
* 3) Someone has the stripe locked, but we're not able to merge.
|
|
* The rbio is added to the lock owner's plug list, or merged into
|
|
* an rbio already on the plug list. When the lock owner unlocks,
|
|
* the next rbio on the list is run and the IO is started automatically.
|
|
* 1 is returned
|
|
*
|
|
* If we return 0, the caller still owns the rbio and must continue with
|
|
* IO submission. If we return 1, the caller must assume the rbio has
|
|
* already been freed.
|
|
*/
|
|
static noinline int lock_stripe_add(struct btrfs_raid_bio *rbio)
|
|
{
|
|
struct btrfs_stripe_hash *h;
|
|
struct btrfs_raid_bio *cur;
|
|
struct btrfs_raid_bio *pending;
|
|
unsigned long flags;
|
|
struct btrfs_raid_bio *freeit = NULL;
|
|
struct btrfs_raid_bio *cache_drop = NULL;
|
|
int ret = 0;
|
|
|
|
h = rbio->bioc->fs_info->stripe_hash_table->table + rbio_bucket(rbio);
|
|
|
|
spin_lock_irqsave(&h->lock, flags);
|
|
list_for_each_entry(cur, &h->hash_list, hash_list) {
|
|
if (cur->bioc->raid_map[0] != rbio->bioc->raid_map[0])
|
|
continue;
|
|
|
|
spin_lock(&cur->bio_list_lock);
|
|
|
|
/* Can we steal this cached rbio's pages? */
|
|
if (bio_list_empty(&cur->bio_list) &&
|
|
list_empty(&cur->plug_list) &&
|
|
test_bit(RBIO_CACHE_BIT, &cur->flags) &&
|
|
!test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags)) {
|
|
list_del_init(&cur->hash_list);
|
|
refcount_dec(&cur->refs);
|
|
|
|
steal_rbio(cur, rbio);
|
|
cache_drop = cur;
|
|
spin_unlock(&cur->bio_list_lock);
|
|
|
|
goto lockit;
|
|
}
|
|
|
|
/* Can we merge into the lock owner? */
|
|
if (rbio_can_merge(cur, rbio)) {
|
|
merge_rbio(cur, rbio);
|
|
spin_unlock(&cur->bio_list_lock);
|
|
freeit = rbio;
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
|
|
/*
|
|
* We couldn't merge with the running rbio, see if we can merge
|
|
* with the pending ones. We don't have to check for rmw_locked
|
|
* because there is no way they are inside finish_rmw right now
|
|
*/
|
|
list_for_each_entry(pending, &cur->plug_list, plug_list) {
|
|
if (rbio_can_merge(pending, rbio)) {
|
|
merge_rbio(pending, rbio);
|
|
spin_unlock(&cur->bio_list_lock);
|
|
freeit = rbio;
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* No merging, put us on the tail of the plug list, our rbio
|
|
* will be started with the currently running rbio unlocks
|
|
*/
|
|
list_add_tail(&rbio->plug_list, &cur->plug_list);
|
|
spin_unlock(&cur->bio_list_lock);
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
lockit:
|
|
refcount_inc(&rbio->refs);
|
|
list_add(&rbio->hash_list, &h->hash_list);
|
|
out:
|
|
spin_unlock_irqrestore(&h->lock, flags);
|
|
if (cache_drop)
|
|
remove_rbio_from_cache(cache_drop);
|
|
if (freeit)
|
|
free_raid_bio(freeit);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* called as rmw or parity rebuild is completed. If the plug list has more
|
|
* rbios waiting for this stripe, the next one on the list will be started
|
|
*/
|
|
static noinline void unlock_stripe(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int bucket;
|
|
struct btrfs_stripe_hash *h;
|
|
unsigned long flags;
|
|
int keep_cache = 0;
|
|
|
|
bucket = rbio_bucket(rbio);
|
|
h = rbio->bioc->fs_info->stripe_hash_table->table + bucket;
|
|
|
|
if (list_empty(&rbio->plug_list))
|
|
cache_rbio(rbio);
|
|
|
|
spin_lock_irqsave(&h->lock, flags);
|
|
spin_lock(&rbio->bio_list_lock);
|
|
|
|
if (!list_empty(&rbio->hash_list)) {
|
|
/*
|
|
* if we're still cached and there is no other IO
|
|
* to perform, just leave this rbio here for others
|
|
* to steal from later
|
|
*/
|
|
if (list_empty(&rbio->plug_list) &&
|
|
test_bit(RBIO_CACHE_BIT, &rbio->flags)) {
|
|
keep_cache = 1;
|
|
clear_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
|
|
BUG_ON(!bio_list_empty(&rbio->bio_list));
|
|
goto done;
|
|
}
|
|
|
|
list_del_init(&rbio->hash_list);
|
|
refcount_dec(&rbio->refs);
|
|
|
|
/*
|
|
* we use the plug list to hold all the rbios
|
|
* waiting for the chance to lock this stripe.
|
|
* hand the lock over to one of them.
|
|
*/
|
|
if (!list_empty(&rbio->plug_list)) {
|
|
struct btrfs_raid_bio *next;
|
|
struct list_head *head = rbio->plug_list.next;
|
|
|
|
next = list_entry(head, struct btrfs_raid_bio,
|
|
plug_list);
|
|
|
|
list_del_init(&rbio->plug_list);
|
|
|
|
list_add(&next->hash_list, &h->hash_list);
|
|
refcount_inc(&next->refs);
|
|
spin_unlock(&rbio->bio_list_lock);
|
|
spin_unlock_irqrestore(&h->lock, flags);
|
|
|
|
if (next->operation == BTRFS_RBIO_READ_REBUILD)
|
|
start_async_work(next, read_rebuild_work);
|
|
else if (next->operation == BTRFS_RBIO_REBUILD_MISSING) {
|
|
steal_rbio(rbio, next);
|
|
start_async_work(next, read_rebuild_work);
|
|
} else if (next->operation == BTRFS_RBIO_WRITE) {
|
|
steal_rbio(rbio, next);
|
|
start_async_work(next, rmw_work);
|
|
} else if (next->operation == BTRFS_RBIO_PARITY_SCRUB) {
|
|
steal_rbio(rbio, next);
|
|
start_async_work(next, scrub_parity_work);
|
|
}
|
|
|
|
goto done_nolock;
|
|
}
|
|
}
|
|
done:
|
|
spin_unlock(&rbio->bio_list_lock);
|
|
spin_unlock_irqrestore(&h->lock, flags);
|
|
|
|
done_nolock:
|
|
if (!keep_cache)
|
|
remove_rbio_from_cache(rbio);
|
|
}
|
|
|
|
static void rbio_endio_bio_list(struct bio *cur, blk_status_t err)
|
|
{
|
|
struct bio *next;
|
|
|
|
while (cur) {
|
|
next = cur->bi_next;
|
|
cur->bi_next = NULL;
|
|
cur->bi_status = err;
|
|
bio_endio(cur);
|
|
cur = next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* this frees the rbio and runs through all the bios in the
|
|
* bio_list and calls end_io on them
|
|
*/
|
|
static void rbio_orig_end_io(struct btrfs_raid_bio *rbio, blk_status_t err)
|
|
{
|
|
struct bio *cur = bio_list_get(&rbio->bio_list);
|
|
struct bio *extra;
|
|
|
|
/*
|
|
* Clear the data bitmap, as the rbio may be cached for later usage.
|
|
* do this before before unlock_stripe() so there will be no new bio
|
|
* for this bio.
|
|
*/
|
|
bitmap_clear(&rbio->dbitmap, 0, rbio->stripe_nsectors);
|
|
|
|
/*
|
|
* At this moment, rbio->bio_list is empty, however since rbio does not
|
|
* always have RBIO_RMW_LOCKED_BIT set and rbio is still linked on the
|
|
* hash list, rbio may be merged with others so that rbio->bio_list
|
|
* becomes non-empty.
|
|
* Once unlock_stripe() is done, rbio->bio_list will not be updated any
|
|
* more and we can call bio_endio() on all queued bios.
|
|
*/
|
|
unlock_stripe(rbio);
|
|
extra = bio_list_get(&rbio->bio_list);
|
|
free_raid_bio(rbio);
|
|
|
|
rbio_endio_bio_list(cur, err);
|
|
if (extra)
|
|
rbio_endio_bio_list(extra, err);
|
|
}
|
|
|
|
/*
|
|
* end io function used by finish_rmw. When we finally
|
|
* get here, we've written a full stripe
|
|
*/
|
|
static void raid_write_end_io(struct bio *bio)
|
|
{
|
|
struct btrfs_raid_bio *rbio = bio->bi_private;
|
|
blk_status_t err = bio->bi_status;
|
|
int max_errors;
|
|
|
|
if (err)
|
|
fail_bio_stripe(rbio, bio);
|
|
|
|
bio_put(bio);
|
|
|
|
if (!atomic_dec_and_test(&rbio->stripes_pending))
|
|
return;
|
|
|
|
err = BLK_STS_OK;
|
|
|
|
/* OK, we have read all the stripes we need to. */
|
|
max_errors = (rbio->operation == BTRFS_RBIO_PARITY_SCRUB) ?
|
|
0 : rbio->bioc->max_errors;
|
|
if (atomic_read(&rbio->error) > max_errors)
|
|
err = BLK_STS_IOERR;
|
|
|
|
rbio_orig_end_io(rbio, err);
|
|
}
|
|
|
|
/**
|
|
* Get a sector pointer specified by its @stripe_nr and @sector_nr
|
|
*
|
|
* @rbio: The raid bio
|
|
* @stripe_nr: Stripe number, valid range [0, real_stripe)
|
|
* @sector_nr: Sector number inside the stripe,
|
|
* valid range [0, stripe_nsectors)
|
|
* @bio_list_only: Whether to use sectors inside the bio list only.
|
|
*
|
|
* The read/modify/write code wants to reuse the original bio page as much
|
|
* as possible, and only use stripe_sectors as fallback.
|
|
*/
|
|
static struct sector_ptr *sector_in_rbio(struct btrfs_raid_bio *rbio,
|
|
int stripe_nr, int sector_nr,
|
|
bool bio_list_only)
|
|
{
|
|
struct sector_ptr *sector;
|
|
int index;
|
|
|
|
ASSERT(stripe_nr >= 0 && stripe_nr < rbio->real_stripes);
|
|
ASSERT(sector_nr >= 0 && sector_nr < rbio->stripe_nsectors);
|
|
|
|
index = stripe_nr * rbio->stripe_nsectors + sector_nr;
|
|
ASSERT(index >= 0 && index < rbio->nr_sectors);
|
|
|
|
spin_lock_irq(&rbio->bio_list_lock);
|
|
sector = &rbio->bio_sectors[index];
|
|
if (sector->page || bio_list_only) {
|
|
/* Don't return sector without a valid page pointer */
|
|
if (!sector->page)
|
|
sector = NULL;
|
|
spin_unlock_irq(&rbio->bio_list_lock);
|
|
return sector;
|
|
}
|
|
spin_unlock_irq(&rbio->bio_list_lock);
|
|
|
|
return &rbio->stripe_sectors[index];
|
|
}
|
|
|
|
/*
|
|
* allocation and initial setup for the btrfs_raid_bio. Not
|
|
* this does not allocate any pages for rbio->pages.
|
|
*/
|
|
static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_io_context *bioc)
|
|
{
|
|
const unsigned int real_stripes = bioc->num_stripes - bioc->num_tgtdevs;
|
|
const unsigned int stripe_npages = BTRFS_STRIPE_LEN >> PAGE_SHIFT;
|
|
const unsigned int num_pages = stripe_npages * real_stripes;
|
|
const unsigned int stripe_nsectors =
|
|
BTRFS_STRIPE_LEN >> fs_info->sectorsize_bits;
|
|
const unsigned int num_sectors = stripe_nsectors * real_stripes;
|
|
struct btrfs_raid_bio *rbio;
|
|
|
|
/* PAGE_SIZE must also be aligned to sectorsize for subpage support */
|
|
ASSERT(IS_ALIGNED(PAGE_SIZE, fs_info->sectorsize));
|
|
/*
|
|
* Our current stripe len should be fixed to 64k thus stripe_nsectors
|
|
* (at most 16) should be no larger than BITS_PER_LONG.
|
|
*/
|
|
ASSERT(stripe_nsectors <= BITS_PER_LONG);
|
|
|
|
rbio = kzalloc(sizeof(*rbio), GFP_NOFS);
|
|
if (!rbio)
|
|
return ERR_PTR(-ENOMEM);
|
|
rbio->stripe_pages = kcalloc(num_pages, sizeof(struct page *),
|
|
GFP_NOFS);
|
|
rbio->bio_sectors = kcalloc(num_sectors, sizeof(struct sector_ptr),
|
|
GFP_NOFS);
|
|
rbio->stripe_sectors = kcalloc(num_sectors, sizeof(struct sector_ptr),
|
|
GFP_NOFS);
|
|
rbio->finish_pointers = kcalloc(real_stripes, sizeof(void *), GFP_NOFS);
|
|
|
|
if (!rbio->stripe_pages || !rbio->bio_sectors || !rbio->stripe_sectors ||
|
|
!rbio->finish_pointers) {
|
|
free_raid_bio_pointers(rbio);
|
|
kfree(rbio);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
bio_list_init(&rbio->bio_list);
|
|
INIT_LIST_HEAD(&rbio->plug_list);
|
|
spin_lock_init(&rbio->bio_list_lock);
|
|
INIT_LIST_HEAD(&rbio->stripe_cache);
|
|
INIT_LIST_HEAD(&rbio->hash_list);
|
|
btrfs_get_bioc(bioc);
|
|
rbio->bioc = bioc;
|
|
rbio->nr_pages = num_pages;
|
|
rbio->nr_sectors = num_sectors;
|
|
rbio->real_stripes = real_stripes;
|
|
rbio->stripe_npages = stripe_npages;
|
|
rbio->stripe_nsectors = stripe_nsectors;
|
|
rbio->faila = -1;
|
|
rbio->failb = -1;
|
|
refcount_set(&rbio->refs, 1);
|
|
atomic_set(&rbio->error, 0);
|
|
atomic_set(&rbio->stripes_pending, 0);
|
|
|
|
ASSERT(btrfs_nr_parity_stripes(bioc->map_type));
|
|
rbio->nr_data = real_stripes - btrfs_nr_parity_stripes(bioc->map_type);
|
|
|
|
return rbio;
|
|
}
|
|
|
|
/* allocate pages for all the stripes in the bio, including parity */
|
|
static int alloc_rbio_pages(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_alloc_page_array(rbio->nr_pages, rbio->stripe_pages);
|
|
if (ret < 0)
|
|
return ret;
|
|
/* Mapping all sectors */
|
|
index_stripe_sectors(rbio);
|
|
return 0;
|
|
}
|
|
|
|
/* only allocate pages for p/q stripes */
|
|
static int alloc_rbio_parity_pages(struct btrfs_raid_bio *rbio)
|
|
{
|
|
const int data_pages = rbio->nr_data * rbio->stripe_npages;
|
|
int ret;
|
|
|
|
ret = btrfs_alloc_page_array(rbio->nr_pages - data_pages,
|
|
rbio->stripe_pages + data_pages);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
index_stripe_sectors(rbio);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add a single sector @sector into our list of bios for IO.
|
|
*
|
|
* Return 0 if everything went well.
|
|
* Return <0 for error.
|
|
*/
|
|
static int rbio_add_io_sector(struct btrfs_raid_bio *rbio,
|
|
struct bio_list *bio_list,
|
|
struct sector_ptr *sector,
|
|
unsigned int stripe_nr,
|
|
unsigned int sector_nr,
|
|
enum req_op op)
|
|
{
|
|
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
|
|
struct bio *last = bio_list->tail;
|
|
int ret;
|
|
struct bio *bio;
|
|
struct btrfs_io_stripe *stripe;
|
|
u64 disk_start;
|
|
|
|
/*
|
|
* Note: here stripe_nr has taken device replace into consideration,
|
|
* thus it can be larger than rbio->real_stripe.
|
|
* So here we check against bioc->num_stripes, not rbio->real_stripes.
|
|
*/
|
|
ASSERT(stripe_nr >= 0 && stripe_nr < rbio->bioc->num_stripes);
|
|
ASSERT(sector_nr >= 0 && sector_nr < rbio->stripe_nsectors);
|
|
ASSERT(sector->page);
|
|
|
|
stripe = &rbio->bioc->stripes[stripe_nr];
|
|
disk_start = stripe->physical + sector_nr * sectorsize;
|
|
|
|
/* if the device is missing, just fail this stripe */
|
|
if (!stripe->dev->bdev)
|
|
return fail_rbio_index(rbio, stripe_nr);
|
|
|
|
/* see if we can add this page onto our existing bio */
|
|
if (last) {
|
|
u64 last_end = last->bi_iter.bi_sector << 9;
|
|
last_end += last->bi_iter.bi_size;
|
|
|
|
/*
|
|
* we can't merge these if they are from different
|
|
* devices or if they are not contiguous
|
|
*/
|
|
if (last_end == disk_start && !last->bi_status &&
|
|
last->bi_bdev == stripe->dev->bdev) {
|
|
ret = bio_add_page(last, sector->page, sectorsize,
|
|
sector->pgoff);
|
|
if (ret == sectorsize)
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* put a new bio on the list */
|
|
bio = bio_alloc(stripe->dev->bdev,
|
|
max(BTRFS_STRIPE_LEN >> PAGE_SHIFT, 1),
|
|
op, GFP_NOFS);
|
|
bio->bi_iter.bi_sector = disk_start >> 9;
|
|
bio->bi_private = rbio;
|
|
|
|
bio_add_page(bio, sector->page, sectorsize, sector->pgoff);
|
|
bio_list_add(bio_list, bio);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* while we're doing the read/modify/write cycle, we could
|
|
* have errors in reading pages off the disk. This checks
|
|
* for errors and if we're not able to read the page it'll
|
|
* trigger parity reconstruction. The rmw will be finished
|
|
* after we've reconstructed the failed stripes
|
|
*/
|
|
static void validate_rbio_for_rmw(struct btrfs_raid_bio *rbio)
|
|
{
|
|
if (rbio->faila >= 0 || rbio->failb >= 0) {
|
|
BUG_ON(rbio->faila == rbio->real_stripes - 1);
|
|
__raid56_parity_recover(rbio);
|
|
} else {
|
|
finish_rmw(rbio);
|
|
}
|
|
}
|
|
|
|
static void index_one_bio(struct btrfs_raid_bio *rbio, struct bio *bio)
|
|
{
|
|
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
|
|
struct bio_vec bvec;
|
|
struct bvec_iter iter;
|
|
u32 offset = (bio->bi_iter.bi_sector << SECTOR_SHIFT) -
|
|
rbio->bioc->raid_map[0];
|
|
|
|
bio_for_each_segment(bvec, bio, iter) {
|
|
u32 bvec_offset;
|
|
|
|
for (bvec_offset = 0; bvec_offset < bvec.bv_len;
|
|
bvec_offset += sectorsize, offset += sectorsize) {
|
|
int index = offset / sectorsize;
|
|
struct sector_ptr *sector = &rbio->bio_sectors[index];
|
|
|
|
sector->page = bvec.bv_page;
|
|
sector->pgoff = bvec.bv_offset + bvec_offset;
|
|
ASSERT(sector->pgoff < PAGE_SIZE);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* helper function to walk our bio list and populate the bio_pages array with
|
|
* the result. This seems expensive, but it is faster than constantly
|
|
* searching through the bio list as we setup the IO in finish_rmw or stripe
|
|
* reconstruction.
|
|
*
|
|
* This must be called before you trust the answers from page_in_rbio
|
|
*/
|
|
static void index_rbio_pages(struct btrfs_raid_bio *rbio)
|
|
{
|
|
struct bio *bio;
|
|
|
|
spin_lock_irq(&rbio->bio_list_lock);
|
|
bio_list_for_each(bio, &rbio->bio_list)
|
|
index_one_bio(rbio, bio);
|
|
|
|
spin_unlock_irq(&rbio->bio_list_lock);
|
|
}
|
|
|
|
static void bio_get_trace_info(struct btrfs_raid_bio *rbio, struct bio *bio,
|
|
struct raid56_bio_trace_info *trace_info)
|
|
{
|
|
const struct btrfs_io_context *bioc = rbio->bioc;
|
|
int i;
|
|
|
|
ASSERT(bioc);
|
|
|
|
/* We rely on bio->bi_bdev to find the stripe number. */
|
|
if (!bio->bi_bdev)
|
|
goto not_found;
|
|
|
|
for (i = 0; i < bioc->num_stripes; i++) {
|
|
if (bio->bi_bdev != bioc->stripes[i].dev->bdev)
|
|
continue;
|
|
trace_info->stripe_nr = i;
|
|
trace_info->devid = bioc->stripes[i].dev->devid;
|
|
trace_info->offset = (bio->bi_iter.bi_sector << SECTOR_SHIFT) -
|
|
bioc->stripes[i].physical;
|
|
return;
|
|
}
|
|
|
|
not_found:
|
|
trace_info->devid = -1;
|
|
trace_info->offset = -1;
|
|
trace_info->stripe_nr = -1;
|
|
}
|
|
|
|
/*
|
|
* this is called from one of two situations. We either
|
|
* have a full stripe from the higher layers, or we've read all
|
|
* the missing bits off disk.
|
|
*
|
|
* This will calculate the parity and then send down any
|
|
* changed blocks.
|
|
*/
|
|
static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
|
|
{
|
|
struct btrfs_io_context *bioc = rbio->bioc;
|
|
const u32 sectorsize = bioc->fs_info->sectorsize;
|
|
void **pointers = rbio->finish_pointers;
|
|
int nr_data = rbio->nr_data;
|
|
/* The total sector number inside the full stripe. */
|
|
int total_sector_nr;
|
|
int stripe;
|
|
/* Sector number inside a stripe. */
|
|
int sectornr;
|
|
bool has_qstripe;
|
|
struct bio_list bio_list;
|
|
struct bio *bio;
|
|
int ret;
|
|
|
|
bio_list_init(&bio_list);
|
|
|
|
if (rbio->real_stripes - rbio->nr_data == 1)
|
|
has_qstripe = false;
|
|
else if (rbio->real_stripes - rbio->nr_data == 2)
|
|
has_qstripe = true;
|
|
else
|
|
BUG();
|
|
|
|
/* We should have at least one data sector. */
|
|
ASSERT(bitmap_weight(&rbio->dbitmap, rbio->stripe_nsectors));
|
|
|
|
/* at this point we either have a full stripe,
|
|
* or we've read the full stripe from the drive.
|
|
* recalculate the parity and write the new results.
|
|
*
|
|
* We're not allowed to add any new bios to the
|
|
* bio list here, anyone else that wants to
|
|
* change this stripe needs to do their own rmw.
|
|
*/
|
|
spin_lock_irq(&rbio->bio_list_lock);
|
|
set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
|
|
spin_unlock_irq(&rbio->bio_list_lock);
|
|
|
|
atomic_set(&rbio->error, 0);
|
|
|
|
/*
|
|
* now that we've set rmw_locked, run through the
|
|
* bio list one last time and map the page pointers
|
|
*
|
|
* We don't cache full rbios because we're assuming
|
|
* the higher layers are unlikely to use this area of
|
|
* the disk again soon. If they do use it again,
|
|
* hopefully they will send another full bio.
|
|
*/
|
|
index_rbio_pages(rbio);
|
|
if (!rbio_is_full(rbio))
|
|
cache_rbio_pages(rbio);
|
|
else
|
|
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
|
|
|
|
for (sectornr = 0; sectornr < rbio->stripe_nsectors; sectornr++) {
|
|
struct sector_ptr *sector;
|
|
|
|
/* First collect one sector from each data stripe */
|
|
for (stripe = 0; stripe < nr_data; stripe++) {
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 0);
|
|
pointers[stripe] = kmap_local_page(sector->page) +
|
|
sector->pgoff;
|
|
}
|
|
|
|
/* Then add the parity stripe */
|
|
sector = rbio_pstripe_sector(rbio, sectornr);
|
|
sector->uptodate = 1;
|
|
pointers[stripe++] = kmap_local_page(sector->page) + sector->pgoff;
|
|
|
|
if (has_qstripe) {
|
|
/*
|
|
* RAID6, add the qstripe and call the library function
|
|
* to fill in our p/q
|
|
*/
|
|
sector = rbio_qstripe_sector(rbio, sectornr);
|
|
sector->uptodate = 1;
|
|
pointers[stripe++] = kmap_local_page(sector->page) +
|
|
sector->pgoff;
|
|
|
|
raid6_call.gen_syndrome(rbio->real_stripes, sectorsize,
|
|
pointers);
|
|
} else {
|
|
/* raid5 */
|
|
memcpy(pointers[nr_data], pointers[0], sectorsize);
|
|
run_xor(pointers + 1, nr_data - 1, sectorsize);
|
|
}
|
|
for (stripe = stripe - 1; stripe >= 0; stripe--)
|
|
kunmap_local(pointers[stripe]);
|
|
}
|
|
|
|
/*
|
|
* Start writing. Make bios for everything from the higher layers (the
|
|
* bio_list in our rbio) and our P/Q. Ignore everything else.
|
|
*/
|
|
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
|
|
total_sector_nr++) {
|
|
struct sector_ptr *sector;
|
|
|
|
stripe = total_sector_nr / rbio->stripe_nsectors;
|
|
sectornr = total_sector_nr % rbio->stripe_nsectors;
|
|
|
|
/* This vertical stripe has no data, skip it. */
|
|
if (!test_bit(sectornr, &rbio->dbitmap))
|
|
continue;
|
|
|
|
if (stripe < rbio->nr_data) {
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
|
|
if (!sector)
|
|
continue;
|
|
} else {
|
|
sector = rbio_stripe_sector(rbio, stripe, sectornr);
|
|
}
|
|
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector, stripe,
|
|
sectornr, REQ_OP_WRITE);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
if (likely(!bioc->num_tgtdevs))
|
|
goto write_data;
|
|
|
|
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
|
|
total_sector_nr++) {
|
|
struct sector_ptr *sector;
|
|
|
|
stripe = total_sector_nr / rbio->stripe_nsectors;
|
|
sectornr = total_sector_nr % rbio->stripe_nsectors;
|
|
|
|
if (!bioc->tgtdev_map[stripe]) {
|
|
/*
|
|
* We can skip the whole stripe completely, note
|
|
* total_sector_nr will be increased by one anyway.
|
|
*/
|
|
ASSERT(sectornr == 0);
|
|
total_sector_nr += rbio->stripe_nsectors - 1;
|
|
continue;
|
|
}
|
|
|
|
/* This vertical stripe has no data, skip it. */
|
|
if (!test_bit(sectornr, &rbio->dbitmap))
|
|
continue;
|
|
|
|
if (stripe < rbio->nr_data) {
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
|
|
if (!sector)
|
|
continue;
|
|
} else {
|
|
sector = rbio_stripe_sector(rbio, stripe, sectornr);
|
|
}
|
|
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector,
|
|
rbio->bioc->tgtdev_map[stripe],
|
|
sectornr, REQ_OP_WRITE);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
write_data:
|
|
atomic_set(&rbio->stripes_pending, bio_list_size(&bio_list));
|
|
BUG_ON(atomic_read(&rbio->stripes_pending) == 0);
|
|
|
|
while ((bio = bio_list_pop(&bio_list))) {
|
|
bio->bi_end_io = raid_write_end_io;
|
|
|
|
if (trace_raid56_write_stripe_enabled()) {
|
|
struct raid56_bio_trace_info trace_info = { 0 };
|
|
|
|
bio_get_trace_info(rbio, bio, &trace_info);
|
|
trace_raid56_write_stripe(rbio, bio, &trace_info);
|
|
}
|
|
submit_bio(bio);
|
|
}
|
|
return;
|
|
|
|
cleanup:
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
|
|
while ((bio = bio_list_pop(&bio_list)))
|
|
bio_put(bio);
|
|
}
|
|
|
|
/*
|
|
* helper to find the stripe number for a given bio. Used to figure out which
|
|
* stripe has failed. This expects the bio to correspond to a physical disk,
|
|
* so it looks up based on physical sector numbers.
|
|
*/
|
|
static int find_bio_stripe(struct btrfs_raid_bio *rbio,
|
|
struct bio *bio)
|
|
{
|
|
u64 physical = bio->bi_iter.bi_sector;
|
|
int i;
|
|
struct btrfs_io_stripe *stripe;
|
|
|
|
physical <<= 9;
|
|
|
|
for (i = 0; i < rbio->bioc->num_stripes; i++) {
|
|
stripe = &rbio->bioc->stripes[i];
|
|
if (in_range(physical, stripe->physical, BTRFS_STRIPE_LEN) &&
|
|
stripe->dev->bdev && bio->bi_bdev == stripe->dev->bdev) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* helper to find the stripe number for a given
|
|
* bio (before mapping). Used to figure out which stripe has
|
|
* failed. This looks up based on logical block numbers.
|
|
*/
|
|
static int find_logical_bio_stripe(struct btrfs_raid_bio *rbio,
|
|
struct bio *bio)
|
|
{
|
|
u64 logical = bio->bi_iter.bi_sector << 9;
|
|
int i;
|
|
|
|
for (i = 0; i < rbio->nr_data; i++) {
|
|
u64 stripe_start = rbio->bioc->raid_map[i];
|
|
|
|
if (in_range(logical, stripe_start, BTRFS_STRIPE_LEN))
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* returns -EIO if we had too many failures
|
|
*/
|
|
static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&rbio->bio_list_lock, flags);
|
|
|
|
/* we already know this stripe is bad, move on */
|
|
if (rbio->faila == failed || rbio->failb == failed)
|
|
goto out;
|
|
|
|
if (rbio->faila == -1) {
|
|
/* first failure on this rbio */
|
|
rbio->faila = failed;
|
|
atomic_inc(&rbio->error);
|
|
} else if (rbio->failb == -1) {
|
|
/* second failure on this rbio */
|
|
rbio->failb = failed;
|
|
atomic_inc(&rbio->error);
|
|
} else {
|
|
ret = -EIO;
|
|
}
|
|
out:
|
|
spin_unlock_irqrestore(&rbio->bio_list_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper to fail a stripe based on a physical disk
|
|
* bio.
|
|
*/
|
|
static int fail_bio_stripe(struct btrfs_raid_bio *rbio,
|
|
struct bio *bio)
|
|
{
|
|
int failed = find_bio_stripe(rbio, bio);
|
|
|
|
if (failed < 0)
|
|
return -EIO;
|
|
|
|
return fail_rbio_index(rbio, failed);
|
|
}
|
|
|
|
/*
|
|
* For subpage case, we can no longer set page Uptodate directly for
|
|
* stripe_pages[], thus we need to locate the sector.
|
|
*/
|
|
static struct sector_ptr *find_stripe_sector(struct btrfs_raid_bio *rbio,
|
|
struct page *page,
|
|
unsigned int pgoff)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < rbio->nr_sectors; i++) {
|
|
struct sector_ptr *sector = &rbio->stripe_sectors[i];
|
|
|
|
if (sector->page == page && sector->pgoff == pgoff)
|
|
return sector;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* this sets each page in the bio uptodate. It should only be used on private
|
|
* rbio pages, nothing that comes in from the higher layers
|
|
*/
|
|
static void set_bio_pages_uptodate(struct btrfs_raid_bio *rbio, struct bio *bio)
|
|
{
|
|
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
|
|
struct bio_vec *bvec;
|
|
struct bvec_iter_all iter_all;
|
|
|
|
ASSERT(!bio_flagged(bio, BIO_CLONED));
|
|
|
|
bio_for_each_segment_all(bvec, bio, iter_all) {
|
|
struct sector_ptr *sector;
|
|
int pgoff;
|
|
|
|
for (pgoff = bvec->bv_offset; pgoff - bvec->bv_offset < bvec->bv_len;
|
|
pgoff += sectorsize) {
|
|
sector = find_stripe_sector(rbio, bvec->bv_page, pgoff);
|
|
ASSERT(sector);
|
|
if (sector)
|
|
sector->uptodate = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void raid56_bio_end_io(struct bio *bio)
|
|
{
|
|
struct btrfs_raid_bio *rbio = bio->bi_private;
|
|
|
|
if (bio->bi_status)
|
|
fail_bio_stripe(rbio, bio);
|
|
else
|
|
set_bio_pages_uptodate(rbio, bio);
|
|
|
|
bio_put(bio);
|
|
|
|
if (atomic_dec_and_test(&rbio->stripes_pending))
|
|
queue_work(rbio->bioc->fs_info->endio_raid56_workers,
|
|
&rbio->end_io_work);
|
|
}
|
|
|
|
/*
|
|
* End io handler for the read phase of the RMW cycle. All the bios here are
|
|
* physical stripe bios we've read from the disk so we can recalculate the
|
|
* parity of the stripe.
|
|
*
|
|
* This will usually kick off finish_rmw once all the bios are read in, but it
|
|
* may trigger parity reconstruction if we had any errors along the way
|
|
*/
|
|
static void raid56_rmw_end_io_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_raid_bio *rbio =
|
|
container_of(work, struct btrfs_raid_bio, end_io_work);
|
|
|
|
if (atomic_read(&rbio->error) > rbio->bioc->max_errors) {
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* This will normally call finish_rmw to start our write but if there
|
|
* are any failed stripes we'll reconstruct from parity first.
|
|
*/
|
|
validate_rbio_for_rmw(rbio);
|
|
}
|
|
|
|
/*
|
|
* the stripe must be locked by the caller. It will
|
|
* unlock after all the writes are done
|
|
*/
|
|
static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int bios_to_read = 0;
|
|
struct bio_list bio_list;
|
|
const int nr_data_sectors = rbio->stripe_nsectors * rbio->nr_data;
|
|
int ret;
|
|
int total_sector_nr;
|
|
struct bio *bio;
|
|
|
|
bio_list_init(&bio_list);
|
|
|
|
ret = alloc_rbio_pages(rbio);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
index_rbio_pages(rbio);
|
|
|
|
atomic_set(&rbio->error, 0);
|
|
/* Build a list of bios to read all the missing data sectors. */
|
|
for (total_sector_nr = 0; total_sector_nr < nr_data_sectors;
|
|
total_sector_nr++) {
|
|
struct sector_ptr *sector;
|
|
int stripe = total_sector_nr / rbio->stripe_nsectors;
|
|
int sectornr = total_sector_nr % rbio->stripe_nsectors;
|
|
|
|
/*
|
|
* We want to find all the sectors missing from the rbio and
|
|
* read them from the disk. If sector_in_rbio() finds a page
|
|
* in the bio list we don't need to read it off the stripe.
|
|
*/
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
|
|
if (sector)
|
|
continue;
|
|
|
|
sector = rbio_stripe_sector(rbio, stripe, sectornr);
|
|
/*
|
|
* The bio cache may have handed us an uptodate page. If so,
|
|
* use it.
|
|
*/
|
|
if (sector->uptodate)
|
|
continue;
|
|
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector,
|
|
stripe, sectornr, REQ_OP_READ);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
bios_to_read = bio_list_size(&bio_list);
|
|
if (!bios_to_read) {
|
|
/*
|
|
* this can happen if others have merged with
|
|
* us, it means there is nothing left to read.
|
|
* But if there are missing devices it may not be
|
|
* safe to do the full stripe write yet.
|
|
*/
|
|
goto finish;
|
|
}
|
|
|
|
/*
|
|
* The bioc may be freed once we submit the last bio. Make sure not to
|
|
* touch it after that.
|
|
*/
|
|
atomic_set(&rbio->stripes_pending, bios_to_read);
|
|
INIT_WORK(&rbio->end_io_work, raid56_rmw_end_io_work);
|
|
while ((bio = bio_list_pop(&bio_list))) {
|
|
bio->bi_end_io = raid56_bio_end_io;
|
|
|
|
if (trace_raid56_read_partial_enabled()) {
|
|
struct raid56_bio_trace_info trace_info = { 0 };
|
|
|
|
bio_get_trace_info(rbio, bio, &trace_info);
|
|
trace_raid56_read_partial(rbio, bio, &trace_info);
|
|
}
|
|
submit_bio(bio);
|
|
}
|
|
/* the actual write will happen once the reads are done */
|
|
return 0;
|
|
|
|
cleanup:
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
|
|
while ((bio = bio_list_pop(&bio_list)))
|
|
bio_put(bio);
|
|
|
|
return -EIO;
|
|
|
|
finish:
|
|
validate_rbio_for_rmw(rbio);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* if the upper layers pass in a full stripe, we thank them by only allocating
|
|
* enough pages to hold the parity, and sending it all down quickly.
|
|
*/
|
|
static int full_stripe_write(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int ret;
|
|
|
|
ret = alloc_rbio_parity_pages(rbio);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = lock_stripe_add(rbio);
|
|
if (ret == 0)
|
|
finish_rmw(rbio);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* partial stripe writes get handed over to async helpers.
|
|
* We're really hoping to merge a few more writes into this
|
|
* rbio before calculating new parity
|
|
*/
|
|
static int partial_stripe_write(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int ret;
|
|
|
|
ret = lock_stripe_add(rbio);
|
|
if (ret == 0)
|
|
start_async_work(rbio, rmw_work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* sometimes while we were reading from the drive to
|
|
* recalculate parity, enough new bios come into create
|
|
* a full stripe. So we do a check here to see if we can
|
|
* go directly to finish_rmw
|
|
*/
|
|
static int __raid56_parity_write(struct btrfs_raid_bio *rbio)
|
|
{
|
|
/* head off into rmw land if we don't have a full stripe */
|
|
if (!rbio_is_full(rbio))
|
|
return partial_stripe_write(rbio);
|
|
return full_stripe_write(rbio);
|
|
}
|
|
|
|
/*
|
|
* We use plugging call backs to collect full stripes.
|
|
* Any time we get a partial stripe write while plugged
|
|
* we collect it into a list. When the unplug comes down,
|
|
* we sort the list by logical block number and merge
|
|
* everything we can into the same rbios
|
|
*/
|
|
struct btrfs_plug_cb {
|
|
struct blk_plug_cb cb;
|
|
struct btrfs_fs_info *info;
|
|
struct list_head rbio_list;
|
|
struct work_struct work;
|
|
};
|
|
|
|
/*
|
|
* rbios on the plug list are sorted for easier merging.
|
|
*/
|
|
static int plug_cmp(void *priv, const struct list_head *a,
|
|
const struct list_head *b)
|
|
{
|
|
const struct btrfs_raid_bio *ra = container_of(a, struct btrfs_raid_bio,
|
|
plug_list);
|
|
const struct btrfs_raid_bio *rb = container_of(b, struct btrfs_raid_bio,
|
|
plug_list);
|
|
u64 a_sector = ra->bio_list.head->bi_iter.bi_sector;
|
|
u64 b_sector = rb->bio_list.head->bi_iter.bi_sector;
|
|
|
|
if (a_sector < b_sector)
|
|
return -1;
|
|
if (a_sector > b_sector)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void run_plug(struct btrfs_plug_cb *plug)
|
|
{
|
|
struct btrfs_raid_bio *cur;
|
|
struct btrfs_raid_bio *last = NULL;
|
|
|
|
/*
|
|
* sort our plug list then try to merge
|
|
* everything we can in hopes of creating full
|
|
* stripes.
|
|
*/
|
|
list_sort(NULL, &plug->rbio_list, plug_cmp);
|
|
while (!list_empty(&plug->rbio_list)) {
|
|
cur = list_entry(plug->rbio_list.next,
|
|
struct btrfs_raid_bio, plug_list);
|
|
list_del_init(&cur->plug_list);
|
|
|
|
if (rbio_is_full(cur)) {
|
|
int ret;
|
|
|
|
/* we have a full stripe, send it down */
|
|
ret = full_stripe_write(cur);
|
|
BUG_ON(ret);
|
|
continue;
|
|
}
|
|
if (last) {
|
|
if (rbio_can_merge(last, cur)) {
|
|
merge_rbio(last, cur);
|
|
free_raid_bio(cur);
|
|
continue;
|
|
|
|
}
|
|
__raid56_parity_write(last);
|
|
}
|
|
last = cur;
|
|
}
|
|
if (last) {
|
|
__raid56_parity_write(last);
|
|
}
|
|
kfree(plug);
|
|
}
|
|
|
|
/*
|
|
* if the unplug comes from schedule, we have to push the
|
|
* work off to a helper thread
|
|
*/
|
|
static void unplug_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_plug_cb *plug;
|
|
plug = container_of(work, struct btrfs_plug_cb, work);
|
|
run_plug(plug);
|
|
}
|
|
|
|
static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule)
|
|
{
|
|
struct btrfs_plug_cb *plug;
|
|
plug = container_of(cb, struct btrfs_plug_cb, cb);
|
|
|
|
if (from_schedule) {
|
|
INIT_WORK(&plug->work, unplug_work);
|
|
queue_work(plug->info->rmw_workers, &plug->work);
|
|
return;
|
|
}
|
|
run_plug(plug);
|
|
}
|
|
|
|
/* Add the original bio into rbio->bio_list, and update rbio::dbitmap. */
|
|
static void rbio_add_bio(struct btrfs_raid_bio *rbio, struct bio *orig_bio)
|
|
{
|
|
const struct btrfs_fs_info *fs_info = rbio->bioc->fs_info;
|
|
const u64 orig_logical = orig_bio->bi_iter.bi_sector << SECTOR_SHIFT;
|
|
const u64 full_stripe_start = rbio->bioc->raid_map[0];
|
|
const u32 orig_len = orig_bio->bi_iter.bi_size;
|
|
const u32 sectorsize = fs_info->sectorsize;
|
|
u64 cur_logical;
|
|
|
|
ASSERT(orig_logical >= full_stripe_start &&
|
|
orig_logical + orig_len <= full_stripe_start +
|
|
rbio->nr_data * BTRFS_STRIPE_LEN);
|
|
|
|
bio_list_add(&rbio->bio_list, orig_bio);
|
|
rbio->bio_list_bytes += orig_bio->bi_iter.bi_size;
|
|
|
|
/* Update the dbitmap. */
|
|
for (cur_logical = orig_logical; cur_logical < orig_logical + orig_len;
|
|
cur_logical += sectorsize) {
|
|
int bit = ((u32)(cur_logical - full_stripe_start) >>
|
|
fs_info->sectorsize_bits) % rbio->stripe_nsectors;
|
|
|
|
set_bit(bit, &rbio->dbitmap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* our main entry point for writes from the rest of the FS.
|
|
*/
|
|
void raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = bioc->fs_info;
|
|
struct btrfs_raid_bio *rbio;
|
|
struct btrfs_plug_cb *plug = NULL;
|
|
struct blk_plug_cb *cb;
|
|
int ret = 0;
|
|
|
|
rbio = alloc_rbio(fs_info, bioc);
|
|
if (IS_ERR(rbio)) {
|
|
ret = PTR_ERR(rbio);
|
|
goto fail;
|
|
}
|
|
rbio->operation = BTRFS_RBIO_WRITE;
|
|
rbio_add_bio(rbio, bio);
|
|
|
|
/*
|
|
* don't plug on full rbios, just get them out the door
|
|
* as quickly as we can
|
|
*/
|
|
if (rbio_is_full(rbio)) {
|
|
ret = full_stripe_write(rbio);
|
|
if (ret) {
|
|
free_raid_bio(rbio);
|
|
goto fail;
|
|
}
|
|
return;
|
|
}
|
|
|
|
cb = blk_check_plugged(btrfs_raid_unplug, fs_info, sizeof(*plug));
|
|
if (cb) {
|
|
plug = container_of(cb, struct btrfs_plug_cb, cb);
|
|
if (!plug->info) {
|
|
plug->info = fs_info;
|
|
INIT_LIST_HEAD(&plug->rbio_list);
|
|
}
|
|
list_add_tail(&rbio->plug_list, &plug->rbio_list);
|
|
} else {
|
|
ret = __raid56_parity_write(rbio);
|
|
if (ret) {
|
|
free_raid_bio(rbio);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
bio->bi_status = errno_to_blk_status(ret);
|
|
bio_endio(bio);
|
|
}
|
|
|
|
/*
|
|
* all parity reconstruction happens here. We've read in everything
|
|
* we can find from the drives and this does the heavy lifting of
|
|
* sorting the good from the bad.
|
|
*/
|
|
static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
|
|
{
|
|
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
|
|
int sectornr, stripe;
|
|
void **pointers;
|
|
void **unmap_array;
|
|
int faila = -1, failb = -1;
|
|
blk_status_t err;
|
|
int i;
|
|
|
|
/*
|
|
* This array stores the pointer for each sector, thus it has the extra
|
|
* pgoff value added from each sector
|
|
*/
|
|
pointers = kcalloc(rbio->real_stripes, sizeof(void *), GFP_NOFS);
|
|
if (!pointers) {
|
|
err = BLK_STS_RESOURCE;
|
|
goto cleanup_io;
|
|
}
|
|
|
|
/*
|
|
* Store copy of pointers that does not get reordered during
|
|
* reconstruction so that kunmap_local works.
|
|
*/
|
|
unmap_array = kcalloc(rbio->real_stripes, sizeof(void *), GFP_NOFS);
|
|
if (!unmap_array) {
|
|
err = BLK_STS_RESOURCE;
|
|
goto cleanup_pointers;
|
|
}
|
|
|
|
faila = rbio->faila;
|
|
failb = rbio->failb;
|
|
|
|
if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
|
|
rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
|
|
spin_lock_irq(&rbio->bio_list_lock);
|
|
set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
|
|
spin_unlock_irq(&rbio->bio_list_lock);
|
|
}
|
|
|
|
index_rbio_pages(rbio);
|
|
|
|
for (sectornr = 0; sectornr < rbio->stripe_nsectors; sectornr++) {
|
|
struct sector_ptr *sector;
|
|
|
|
/*
|
|
* Now we just use bitmap to mark the horizontal stripes in
|
|
* which we have data when doing parity scrub.
|
|
*/
|
|
if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB &&
|
|
!test_bit(sectornr, &rbio->dbitmap))
|
|
continue;
|
|
|
|
/*
|
|
* Setup our array of pointers with sectors from each stripe
|
|
*
|
|
* NOTE: store a duplicate array of pointers to preserve the
|
|
* pointer order
|
|
*/
|
|
for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
|
|
/*
|
|
* If we're rebuilding a read, we have to use
|
|
* pages from the bio list
|
|
*/
|
|
if ((rbio->operation == BTRFS_RBIO_READ_REBUILD ||
|
|
rbio->operation == BTRFS_RBIO_REBUILD_MISSING) &&
|
|
(stripe == faila || stripe == failb)) {
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 0);
|
|
} else {
|
|
sector = rbio_stripe_sector(rbio, stripe, sectornr);
|
|
}
|
|
ASSERT(sector->page);
|
|
pointers[stripe] = kmap_local_page(sector->page) +
|
|
sector->pgoff;
|
|
unmap_array[stripe] = pointers[stripe];
|
|
}
|
|
|
|
/* All raid6 handling here */
|
|
if (rbio->bioc->map_type & BTRFS_BLOCK_GROUP_RAID6) {
|
|
/* Single failure, rebuild from parity raid5 style */
|
|
if (failb < 0) {
|
|
if (faila == rbio->nr_data) {
|
|
/*
|
|
* Just the P stripe has failed, without
|
|
* a bad data or Q stripe.
|
|
* TODO, we should redo the xor here.
|
|
*/
|
|
err = BLK_STS_IOERR;
|
|
goto cleanup;
|
|
}
|
|
/*
|
|
* a single failure in raid6 is rebuilt
|
|
* in the pstripe code below
|
|
*/
|
|
goto pstripe;
|
|
}
|
|
|
|
/* make sure our ps and qs are in order */
|
|
if (faila > failb)
|
|
swap(faila, failb);
|
|
|
|
/* if the q stripe is failed, do a pstripe reconstruction
|
|
* from the xors.
|
|
* If both the q stripe and the P stripe are failed, we're
|
|
* here due to a crc mismatch and we can't give them the
|
|
* data they want
|
|
*/
|
|
if (rbio->bioc->raid_map[failb] == RAID6_Q_STRIPE) {
|
|
if (rbio->bioc->raid_map[faila] ==
|
|
RAID5_P_STRIPE) {
|
|
err = BLK_STS_IOERR;
|
|
goto cleanup;
|
|
}
|
|
/*
|
|
* otherwise we have one bad data stripe and
|
|
* a good P stripe. raid5!
|
|
*/
|
|
goto pstripe;
|
|
}
|
|
|
|
if (rbio->bioc->raid_map[failb] == RAID5_P_STRIPE) {
|
|
raid6_datap_recov(rbio->real_stripes,
|
|
sectorsize, faila, pointers);
|
|
} else {
|
|
raid6_2data_recov(rbio->real_stripes,
|
|
sectorsize, faila, failb,
|
|
pointers);
|
|
}
|
|
} else {
|
|
void *p;
|
|
|
|
/* rebuild from P stripe here (raid5 or raid6) */
|
|
BUG_ON(failb != -1);
|
|
pstripe:
|
|
/* Copy parity block into failed block to start with */
|
|
memcpy(pointers[faila], pointers[rbio->nr_data], sectorsize);
|
|
|
|
/* rearrange the pointer array */
|
|
p = pointers[faila];
|
|
for (stripe = faila; stripe < rbio->nr_data - 1; stripe++)
|
|
pointers[stripe] = pointers[stripe + 1];
|
|
pointers[rbio->nr_data - 1] = p;
|
|
|
|
/* xor in the rest */
|
|
run_xor(pointers, rbio->nr_data - 1, sectorsize);
|
|
}
|
|
|
|
/*
|
|
* No matter if this is a RMW or recovery, we should have all
|
|
* failed sectors repaired, thus they are now uptodate.
|
|
* Especially if we determine to cache the rbio, we need to
|
|
* have at least all data sectors uptodate.
|
|
*/
|
|
for (i = 0; i < rbio->stripe_nsectors; i++) {
|
|
if (faila != -1) {
|
|
sector = rbio_stripe_sector(rbio, faila, i);
|
|
sector->uptodate = 1;
|
|
}
|
|
if (failb != -1) {
|
|
sector = rbio_stripe_sector(rbio, failb, i);
|
|
sector->uptodate = 1;
|
|
}
|
|
}
|
|
for (stripe = rbio->real_stripes - 1; stripe >= 0; stripe--)
|
|
kunmap_local(unmap_array[stripe]);
|
|
}
|
|
|
|
err = BLK_STS_OK;
|
|
cleanup:
|
|
kfree(unmap_array);
|
|
cleanup_pointers:
|
|
kfree(pointers);
|
|
|
|
cleanup_io:
|
|
/*
|
|
* Similar to READ_REBUILD, REBUILD_MISSING at this point also has a
|
|
* valid rbio which is consistent with ondisk content, thus such a
|
|
* valid rbio can be cached to avoid further disk reads.
|
|
*/
|
|
if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
|
|
rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
|
|
/*
|
|
* - In case of two failures, where rbio->failb != -1:
|
|
*
|
|
* Do not cache this rbio since the above read reconstruction
|
|
* (raid6_datap_recov() or raid6_2data_recov()) may have
|
|
* changed some content of stripes which are not identical to
|
|
* on-disk content any more, otherwise, a later write/recover
|
|
* may steal stripe_pages from this rbio and end up with
|
|
* corruptions or rebuild failures.
|
|
*
|
|
* - In case of single failure, where rbio->failb == -1:
|
|
*
|
|
* Cache this rbio iff the above read reconstruction is
|
|
* executed without problems.
|
|
*/
|
|
if (err == BLK_STS_OK && rbio->failb < 0)
|
|
cache_rbio_pages(rbio);
|
|
else
|
|
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
|
|
|
|
rbio_orig_end_io(rbio, err);
|
|
} else if (err == BLK_STS_OK) {
|
|
rbio->faila = -1;
|
|
rbio->failb = -1;
|
|
|
|
if (rbio->operation == BTRFS_RBIO_WRITE)
|
|
finish_rmw(rbio);
|
|
else if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB)
|
|
finish_parity_scrub(rbio, 0);
|
|
else
|
|
BUG();
|
|
} else {
|
|
rbio_orig_end_io(rbio, err);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called only for stripes we've read from disk to reconstruct the
|
|
* parity.
|
|
*/
|
|
static void raid_recover_end_io_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_raid_bio *rbio =
|
|
container_of(work, struct btrfs_raid_bio, end_io_work);
|
|
|
|
if (atomic_read(&rbio->error) > rbio->bioc->max_errors)
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
else
|
|
__raid_recover_end_io(rbio);
|
|
}
|
|
|
|
/*
|
|
* reads everything we need off the disk to reconstruct
|
|
* the parity. endio handlers trigger final reconstruction
|
|
* when the IO is done.
|
|
*
|
|
* This is used both for reads from the higher layers and for
|
|
* parity construction required to finish a rmw cycle.
|
|
*/
|
|
static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int bios_to_read = 0;
|
|
struct bio_list bio_list;
|
|
int ret;
|
|
int total_sector_nr;
|
|
struct bio *bio;
|
|
|
|
bio_list_init(&bio_list);
|
|
|
|
ret = alloc_rbio_pages(rbio);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
atomic_set(&rbio->error, 0);
|
|
|
|
/*
|
|
* Read everything that hasn't failed. However this time we will
|
|
* not trust any cached sector.
|
|
* As we may read out some stale data but higher layer is not reading
|
|
* that stale part.
|
|
*
|
|
* So here we always re-read everything in recovery path.
|
|
*/
|
|
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
|
|
total_sector_nr++) {
|
|
int stripe = total_sector_nr / rbio->stripe_nsectors;
|
|
int sectornr = total_sector_nr % rbio->stripe_nsectors;
|
|
struct sector_ptr *sector;
|
|
|
|
if (rbio->faila == stripe || rbio->failb == stripe) {
|
|
atomic_inc(&rbio->error);
|
|
/* Skip the current stripe. */
|
|
ASSERT(sectornr == 0);
|
|
total_sector_nr += rbio->stripe_nsectors - 1;
|
|
continue;
|
|
}
|
|
sector = rbio_stripe_sector(rbio, stripe, sectornr);
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector, stripe,
|
|
sectornr, REQ_OP_READ);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
}
|
|
|
|
bios_to_read = bio_list_size(&bio_list);
|
|
if (!bios_to_read) {
|
|
/*
|
|
* we might have no bios to read just because the pages
|
|
* were up to date, or we might have no bios to read because
|
|
* the devices were gone.
|
|
*/
|
|
if (atomic_read(&rbio->error) <= rbio->bioc->max_errors) {
|
|
__raid_recover_end_io(rbio);
|
|
return 0;
|
|
} else {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The bioc may be freed once we submit the last bio. Make sure not to
|
|
* touch it after that.
|
|
*/
|
|
atomic_set(&rbio->stripes_pending, bios_to_read);
|
|
INIT_WORK(&rbio->end_io_work, raid_recover_end_io_work);
|
|
while ((bio = bio_list_pop(&bio_list))) {
|
|
bio->bi_end_io = raid56_bio_end_io;
|
|
|
|
if (trace_raid56_scrub_read_recover_enabled()) {
|
|
struct raid56_bio_trace_info trace_info = { 0 };
|
|
|
|
bio_get_trace_info(rbio, bio, &trace_info);
|
|
trace_raid56_scrub_read_recover(rbio, bio, &trace_info);
|
|
}
|
|
submit_bio(bio);
|
|
}
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
|
|
rbio->operation == BTRFS_RBIO_REBUILD_MISSING)
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
|
|
while ((bio = bio_list_pop(&bio_list)))
|
|
bio_put(bio);
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* the main entry point for reads from the higher layers. This
|
|
* is really only called when the normal read path had a failure,
|
|
* so we assume the bio they send down corresponds to a failed part
|
|
* of the drive.
|
|
*/
|
|
void raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
|
|
int mirror_num)
|
|
{
|
|
struct btrfs_fs_info *fs_info = bioc->fs_info;
|
|
struct btrfs_raid_bio *rbio;
|
|
|
|
rbio = alloc_rbio(fs_info, bioc);
|
|
if (IS_ERR(rbio)) {
|
|
bio->bi_status = errno_to_blk_status(PTR_ERR(rbio));
|
|
goto out_end_bio;
|
|
}
|
|
|
|
rbio->operation = BTRFS_RBIO_READ_REBUILD;
|
|
rbio_add_bio(rbio, bio);
|
|
|
|
rbio->faila = find_logical_bio_stripe(rbio, bio);
|
|
if (rbio->faila == -1) {
|
|
btrfs_warn(fs_info,
|
|
"%s could not find the bad stripe in raid56 so that we cannot recover any more (bio has logical %llu len %llu, bioc has map_type %llu)",
|
|
__func__, bio->bi_iter.bi_sector << 9,
|
|
(u64)bio->bi_iter.bi_size, bioc->map_type);
|
|
free_raid_bio(rbio);
|
|
bio->bi_status = BLK_STS_IOERR;
|
|
goto out_end_bio;
|
|
}
|
|
|
|
/*
|
|
* Loop retry:
|
|
* for 'mirror == 2', reconstruct from all other stripes.
|
|
* for 'mirror_num > 2', select a stripe to fail on every retry.
|
|
*/
|
|
if (mirror_num > 2) {
|
|
/*
|
|
* 'mirror == 3' is to fail the p stripe and
|
|
* reconstruct from the q stripe. 'mirror > 3' is to
|
|
* fail a data stripe and reconstruct from p+q stripe.
|
|
*/
|
|
rbio->failb = rbio->real_stripes - (mirror_num - 1);
|
|
ASSERT(rbio->failb > 0);
|
|
if (rbio->failb <= rbio->faila)
|
|
rbio->failb--;
|
|
}
|
|
|
|
if (lock_stripe_add(rbio))
|
|
return;
|
|
|
|
/*
|
|
* This adds our rbio to the list of rbios that will be handled after
|
|
* the current lock owner is done.
|
|
*/
|
|
__raid56_parity_recover(rbio);
|
|
return;
|
|
|
|
out_end_bio:
|
|
bio_endio(bio);
|
|
}
|
|
|
|
static void rmw_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_raid_bio *rbio;
|
|
|
|
rbio = container_of(work, struct btrfs_raid_bio, work);
|
|
raid56_rmw_stripe(rbio);
|
|
}
|
|
|
|
static void read_rebuild_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_raid_bio *rbio;
|
|
|
|
rbio = container_of(work, struct btrfs_raid_bio, work);
|
|
__raid56_parity_recover(rbio);
|
|
}
|
|
|
|
/*
|
|
* The following code is used to scrub/replace the parity stripe
|
|
*
|
|
* Caller must have already increased bio_counter for getting @bioc.
|
|
*
|
|
* Note: We need make sure all the pages that add into the scrub/replace
|
|
* raid bio are correct and not be changed during the scrub/replace. That
|
|
* is those pages just hold metadata or file data with checksum.
|
|
*/
|
|
|
|
struct btrfs_raid_bio *raid56_parity_alloc_scrub_rbio(struct bio *bio,
|
|
struct btrfs_io_context *bioc,
|
|
struct btrfs_device *scrub_dev,
|
|
unsigned long *dbitmap, int stripe_nsectors)
|
|
{
|
|
struct btrfs_fs_info *fs_info = bioc->fs_info;
|
|
struct btrfs_raid_bio *rbio;
|
|
int i;
|
|
|
|
rbio = alloc_rbio(fs_info, bioc);
|
|
if (IS_ERR(rbio))
|
|
return NULL;
|
|
bio_list_add(&rbio->bio_list, bio);
|
|
/*
|
|
* This is a special bio which is used to hold the completion handler
|
|
* and make the scrub rbio is similar to the other types
|
|
*/
|
|
ASSERT(!bio->bi_iter.bi_size);
|
|
rbio->operation = BTRFS_RBIO_PARITY_SCRUB;
|
|
|
|
/*
|
|
* After mapping bioc with BTRFS_MAP_WRITE, parities have been sorted
|
|
* to the end position, so this search can start from the first parity
|
|
* stripe.
|
|
*/
|
|
for (i = rbio->nr_data; i < rbio->real_stripes; i++) {
|
|
if (bioc->stripes[i].dev == scrub_dev) {
|
|
rbio->scrubp = i;
|
|
break;
|
|
}
|
|
}
|
|
ASSERT(i < rbio->real_stripes);
|
|
|
|
bitmap_copy(&rbio->dbitmap, dbitmap, stripe_nsectors);
|
|
return rbio;
|
|
}
|
|
|
|
/* Used for both parity scrub and missing. */
|
|
void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
|
|
unsigned int pgoff, u64 logical)
|
|
{
|
|
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
|
|
int stripe_offset;
|
|
int index;
|
|
|
|
ASSERT(logical >= rbio->bioc->raid_map[0]);
|
|
ASSERT(logical + sectorsize <= rbio->bioc->raid_map[0] +
|
|
BTRFS_STRIPE_LEN * rbio->nr_data);
|
|
stripe_offset = (int)(logical - rbio->bioc->raid_map[0]);
|
|
index = stripe_offset / sectorsize;
|
|
rbio->bio_sectors[index].page = page;
|
|
rbio->bio_sectors[index].pgoff = pgoff;
|
|
}
|
|
|
|
/*
|
|
* We just scrub the parity that we have correct data on the same horizontal,
|
|
* so we needn't allocate all pages for all the stripes.
|
|
*/
|
|
static int alloc_rbio_essential_pages(struct btrfs_raid_bio *rbio)
|
|
{
|
|
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
|
|
int total_sector_nr;
|
|
|
|
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
|
|
total_sector_nr++) {
|
|
struct page *page;
|
|
int sectornr = total_sector_nr % rbio->stripe_nsectors;
|
|
int index = (total_sector_nr * sectorsize) >> PAGE_SHIFT;
|
|
|
|
if (!test_bit(sectornr, &rbio->dbitmap))
|
|
continue;
|
|
if (rbio->stripe_pages[index])
|
|
continue;
|
|
page = alloc_page(GFP_NOFS);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
rbio->stripe_pages[index] = page;
|
|
}
|
|
index_stripe_sectors(rbio);
|
|
return 0;
|
|
}
|
|
|
|
static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
|
|
int need_check)
|
|
{
|
|
struct btrfs_io_context *bioc = rbio->bioc;
|
|
const u32 sectorsize = bioc->fs_info->sectorsize;
|
|
void **pointers = rbio->finish_pointers;
|
|
unsigned long *pbitmap = &rbio->finish_pbitmap;
|
|
int nr_data = rbio->nr_data;
|
|
int stripe;
|
|
int sectornr;
|
|
bool has_qstripe;
|
|
struct sector_ptr p_sector = { 0 };
|
|
struct sector_ptr q_sector = { 0 };
|
|
struct bio_list bio_list;
|
|
struct bio *bio;
|
|
int is_replace = 0;
|
|
int ret;
|
|
|
|
bio_list_init(&bio_list);
|
|
|
|
if (rbio->real_stripes - rbio->nr_data == 1)
|
|
has_qstripe = false;
|
|
else if (rbio->real_stripes - rbio->nr_data == 2)
|
|
has_qstripe = true;
|
|
else
|
|
BUG();
|
|
|
|
if (bioc->num_tgtdevs && bioc->tgtdev_map[rbio->scrubp]) {
|
|
is_replace = 1;
|
|
bitmap_copy(pbitmap, &rbio->dbitmap, rbio->stripe_nsectors);
|
|
}
|
|
|
|
/*
|
|
* Because the higher layers(scrubber) are unlikely to
|
|
* use this area of the disk again soon, so don't cache
|
|
* it.
|
|
*/
|
|
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
|
|
|
|
if (!need_check)
|
|
goto writeback;
|
|
|
|
p_sector.page = alloc_page(GFP_NOFS);
|
|
if (!p_sector.page)
|
|
goto cleanup;
|
|
p_sector.pgoff = 0;
|
|
p_sector.uptodate = 1;
|
|
|
|
if (has_qstripe) {
|
|
/* RAID6, allocate and map temp space for the Q stripe */
|
|
q_sector.page = alloc_page(GFP_NOFS);
|
|
if (!q_sector.page) {
|
|
__free_page(p_sector.page);
|
|
p_sector.page = NULL;
|
|
goto cleanup;
|
|
}
|
|
q_sector.pgoff = 0;
|
|
q_sector.uptodate = 1;
|
|
pointers[rbio->real_stripes - 1] = kmap_local_page(q_sector.page);
|
|
}
|
|
|
|
atomic_set(&rbio->error, 0);
|
|
|
|
/* Map the parity stripe just once */
|
|
pointers[nr_data] = kmap_local_page(p_sector.page);
|
|
|
|
for_each_set_bit(sectornr, &rbio->dbitmap, rbio->stripe_nsectors) {
|
|
struct sector_ptr *sector;
|
|
void *parity;
|
|
|
|
/* first collect one page from each data stripe */
|
|
for (stripe = 0; stripe < nr_data; stripe++) {
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 0);
|
|
pointers[stripe] = kmap_local_page(sector->page) +
|
|
sector->pgoff;
|
|
}
|
|
|
|
if (has_qstripe) {
|
|
/* RAID6, call the library function to fill in our P/Q */
|
|
raid6_call.gen_syndrome(rbio->real_stripes, sectorsize,
|
|
pointers);
|
|
} else {
|
|
/* raid5 */
|
|
memcpy(pointers[nr_data], pointers[0], sectorsize);
|
|
run_xor(pointers + 1, nr_data - 1, sectorsize);
|
|
}
|
|
|
|
/* Check scrubbing parity and repair it */
|
|
sector = rbio_stripe_sector(rbio, rbio->scrubp, sectornr);
|
|
parity = kmap_local_page(sector->page) + sector->pgoff;
|
|
if (memcmp(parity, pointers[rbio->scrubp], sectorsize) != 0)
|
|
memcpy(parity, pointers[rbio->scrubp], sectorsize);
|
|
else
|
|
/* Parity is right, needn't writeback */
|
|
bitmap_clear(&rbio->dbitmap, sectornr, 1);
|
|
kunmap_local(parity);
|
|
|
|
for (stripe = nr_data - 1; stripe >= 0; stripe--)
|
|
kunmap_local(pointers[stripe]);
|
|
}
|
|
|
|
kunmap_local(pointers[nr_data]);
|
|
__free_page(p_sector.page);
|
|
p_sector.page = NULL;
|
|
if (q_sector.page) {
|
|
kunmap_local(pointers[rbio->real_stripes - 1]);
|
|
__free_page(q_sector.page);
|
|
q_sector.page = NULL;
|
|
}
|
|
|
|
writeback:
|
|
/*
|
|
* time to start writing. Make bios for everything from the
|
|
* higher layers (the bio_list in our rbio) and our p/q. Ignore
|
|
* everything else.
|
|
*/
|
|
for_each_set_bit(sectornr, &rbio->dbitmap, rbio->stripe_nsectors) {
|
|
struct sector_ptr *sector;
|
|
|
|
sector = rbio_stripe_sector(rbio, rbio->scrubp, sectornr);
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector, rbio->scrubp,
|
|
sectornr, REQ_OP_WRITE);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
if (!is_replace)
|
|
goto submit_write;
|
|
|
|
for_each_set_bit(sectornr, pbitmap, rbio->stripe_nsectors) {
|
|
struct sector_ptr *sector;
|
|
|
|
sector = rbio_stripe_sector(rbio, rbio->scrubp, sectornr);
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector,
|
|
bioc->tgtdev_map[rbio->scrubp],
|
|
sectornr, REQ_OP_WRITE);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
submit_write:
|
|
nr_data = bio_list_size(&bio_list);
|
|
if (!nr_data) {
|
|
/* Every parity is right */
|
|
rbio_orig_end_io(rbio, BLK_STS_OK);
|
|
return;
|
|
}
|
|
|
|
atomic_set(&rbio->stripes_pending, nr_data);
|
|
|
|
while ((bio = bio_list_pop(&bio_list))) {
|
|
bio->bi_end_io = raid_write_end_io;
|
|
|
|
if (trace_raid56_scrub_write_stripe_enabled()) {
|
|
struct raid56_bio_trace_info trace_info = { 0 };
|
|
|
|
bio_get_trace_info(rbio, bio, &trace_info);
|
|
trace_raid56_scrub_write_stripe(rbio, bio, &trace_info);
|
|
}
|
|
submit_bio(bio);
|
|
}
|
|
return;
|
|
|
|
cleanup:
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
|
|
while ((bio = bio_list_pop(&bio_list)))
|
|
bio_put(bio);
|
|
}
|
|
|
|
static inline int is_data_stripe(struct btrfs_raid_bio *rbio, int stripe)
|
|
{
|
|
if (stripe >= 0 && stripe < rbio->nr_data)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* While we're doing the parity check and repair, we could have errors
|
|
* in reading pages off the disk. This checks for errors and if we're
|
|
* not able to read the page it'll trigger parity reconstruction. The
|
|
* parity scrub will be finished after we've reconstructed the failed
|
|
* stripes
|
|
*/
|
|
static void validate_rbio_for_parity_scrub(struct btrfs_raid_bio *rbio)
|
|
{
|
|
if (atomic_read(&rbio->error) > rbio->bioc->max_errors)
|
|
goto cleanup;
|
|
|
|
if (rbio->faila >= 0 || rbio->failb >= 0) {
|
|
int dfail = 0, failp = -1;
|
|
|
|
if (is_data_stripe(rbio, rbio->faila))
|
|
dfail++;
|
|
else if (is_parity_stripe(rbio->faila))
|
|
failp = rbio->faila;
|
|
|
|
if (is_data_stripe(rbio, rbio->failb))
|
|
dfail++;
|
|
else if (is_parity_stripe(rbio->failb))
|
|
failp = rbio->failb;
|
|
|
|
/*
|
|
* Because we can not use a scrubbing parity to repair
|
|
* the data, so the capability of the repair is declined.
|
|
* (In the case of RAID5, we can not repair anything)
|
|
*/
|
|
if (dfail > rbio->bioc->max_errors - 1)
|
|
goto cleanup;
|
|
|
|
/*
|
|
* If all data is good, only parity is correctly, just
|
|
* repair the parity.
|
|
*/
|
|
if (dfail == 0) {
|
|
finish_parity_scrub(rbio, 0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Here means we got one corrupted data stripe and one
|
|
* corrupted parity on RAID6, if the corrupted parity
|
|
* is scrubbing parity, luckily, use the other one to repair
|
|
* the data, or we can not repair the data stripe.
|
|
*/
|
|
if (failp != rbio->scrubp)
|
|
goto cleanup;
|
|
|
|
__raid_recover_end_io(rbio);
|
|
} else {
|
|
finish_parity_scrub(rbio, 1);
|
|
}
|
|
return;
|
|
|
|
cleanup:
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
}
|
|
|
|
/*
|
|
* end io for the read phase of the rmw cycle. All the bios here are physical
|
|
* stripe bios we've read from the disk so we can recalculate the parity of the
|
|
* stripe.
|
|
*
|
|
* This will usually kick off finish_rmw once all the bios are read in, but it
|
|
* may trigger parity reconstruction if we had any errors along the way
|
|
*/
|
|
static void raid56_parity_scrub_end_io_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_raid_bio *rbio =
|
|
container_of(work, struct btrfs_raid_bio, end_io_work);
|
|
|
|
/*
|
|
* This will normally call finish_rmw to start our write, but if there
|
|
* are any failed stripes we'll reconstruct from parity first
|
|
*/
|
|
validate_rbio_for_parity_scrub(rbio);
|
|
}
|
|
|
|
static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
|
|
{
|
|
int bios_to_read = 0;
|
|
struct bio_list bio_list;
|
|
int ret;
|
|
int total_sector_nr;
|
|
struct bio *bio;
|
|
|
|
bio_list_init(&bio_list);
|
|
|
|
ret = alloc_rbio_essential_pages(rbio);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
atomic_set(&rbio->error, 0);
|
|
/* Build a list of bios to read all the missing parts. */
|
|
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
|
|
total_sector_nr++) {
|
|
int sectornr = total_sector_nr % rbio->stripe_nsectors;
|
|
int stripe = total_sector_nr / rbio->stripe_nsectors;
|
|
struct sector_ptr *sector;
|
|
|
|
/* No data in the vertical stripe, no need to read. */
|
|
if (!test_bit(sectornr, &rbio->dbitmap))
|
|
continue;
|
|
|
|
/*
|
|
* We want to find all the sectors missing from the rbio and
|
|
* read them from the disk. If sector_in_rbio() finds a sector
|
|
* in the bio list we don't need to read it off the stripe.
|
|
*/
|
|
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
|
|
if (sector)
|
|
continue;
|
|
|
|
sector = rbio_stripe_sector(rbio, stripe, sectornr);
|
|
/*
|
|
* The bio cache may have handed us an uptodate sector. If so,
|
|
* use it.
|
|
*/
|
|
if (sector->uptodate)
|
|
continue;
|
|
|
|
ret = rbio_add_io_sector(rbio, &bio_list, sector, stripe,
|
|
sectornr, REQ_OP_READ);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
bios_to_read = bio_list_size(&bio_list);
|
|
if (!bios_to_read) {
|
|
/*
|
|
* this can happen if others have merged with
|
|
* us, it means there is nothing left to read.
|
|
* But if there are missing devices it may not be
|
|
* safe to do the full stripe write yet.
|
|
*/
|
|
goto finish;
|
|
}
|
|
|
|
/*
|
|
* The bioc may be freed once we submit the last bio. Make sure not to
|
|
* touch it after that.
|
|
*/
|
|
atomic_set(&rbio->stripes_pending, bios_to_read);
|
|
INIT_WORK(&rbio->end_io_work, raid56_parity_scrub_end_io_work);
|
|
while ((bio = bio_list_pop(&bio_list))) {
|
|
bio->bi_end_io = raid56_bio_end_io;
|
|
|
|
if (trace_raid56_scrub_read_enabled()) {
|
|
struct raid56_bio_trace_info trace_info = { 0 };
|
|
|
|
bio_get_trace_info(rbio, bio, &trace_info);
|
|
trace_raid56_scrub_read(rbio, bio, &trace_info);
|
|
}
|
|
submit_bio(bio);
|
|
}
|
|
/* the actual write will happen once the reads are done */
|
|
return;
|
|
|
|
cleanup:
|
|
rbio_orig_end_io(rbio, BLK_STS_IOERR);
|
|
|
|
while ((bio = bio_list_pop(&bio_list)))
|
|
bio_put(bio);
|
|
|
|
return;
|
|
|
|
finish:
|
|
validate_rbio_for_parity_scrub(rbio);
|
|
}
|
|
|
|
static void scrub_parity_work(struct work_struct *work)
|
|
{
|
|
struct btrfs_raid_bio *rbio;
|
|
|
|
rbio = container_of(work, struct btrfs_raid_bio, work);
|
|
raid56_parity_scrub_stripe(rbio);
|
|
}
|
|
|
|
void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio)
|
|
{
|
|
if (!lock_stripe_add(rbio))
|
|
start_async_work(rbio, scrub_parity_work);
|
|
}
|
|
|
|
/* The following code is used for dev replace of a missing RAID 5/6 device. */
|
|
|
|
struct btrfs_raid_bio *
|
|
raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = bioc->fs_info;
|
|
struct btrfs_raid_bio *rbio;
|
|
|
|
rbio = alloc_rbio(fs_info, bioc);
|
|
if (IS_ERR(rbio))
|
|
return NULL;
|
|
|
|
rbio->operation = BTRFS_RBIO_REBUILD_MISSING;
|
|
bio_list_add(&rbio->bio_list, bio);
|
|
/*
|
|
* This is a special bio which is used to hold the completion handler
|
|
* and make the scrub rbio is similar to the other types
|
|
*/
|
|
ASSERT(!bio->bi_iter.bi_size);
|
|
|
|
rbio->faila = find_logical_bio_stripe(rbio, bio);
|
|
if (rbio->faila == -1) {
|
|
btrfs_warn_rl(fs_info,
|
|
"can not determine the failed stripe number for full stripe %llu",
|
|
bioc->raid_map[0]);
|
|
free_raid_bio(rbio);
|
|
return NULL;
|
|
}
|
|
|
|
return rbio;
|
|
}
|
|
|
|
void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio)
|
|
{
|
|
if (!lock_stripe_add(rbio))
|
|
start_async_work(rbio, read_rebuild_work);
|
|
}
|