/*
- * Copyright (C) 2011 STRATO. All rights reserved.
+ * Copyright (C) 2011, 2012 STRATO. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
#include "transaction.h"
#include "backref.h"
#include "extent_io.h"
+#include "dev-replace.h"
#include "check-integrity.h"
#include "rcu-string.h"
*/
struct scrub_block;
-struct scrub_dev;
+struct scrub_ctx;
-#define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */
-#define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */
+/*
+ * the following three values only influence the performance.
+ * The last one configures the number of parallel and outstanding I/O
+ * operations. The first two values configure an upper limit for the number
+ * of (dynamically allocated) pages that are added to a bio.
+ */
+#define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */
+#define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */
+#define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */
+
+/*
+ * the following value times PAGE_SIZE needs to be large enough to match the
+ * largest node/leaf/sector size that shall be supported.
+ * Values larger than BTRFS_STRIPE_LEN are not supported.
+ */
#define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */
struct scrub_page {
u64 generation;
u64 logical;
u64 physical;
+ u64 physical_for_dev_replace;
+ atomic_t ref_count;
struct {
unsigned int mirror_num:8;
unsigned int have_csum:1;
struct scrub_bio {
int index;
- struct scrub_dev *sdev;
+ struct scrub_ctx *sctx;
+ struct btrfs_device *dev;
struct bio *bio;
int err;
u64 logical;
u64 physical;
- struct scrub_page *pagev[SCRUB_PAGES_PER_BIO];
+#if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
+ struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
+#else
+ struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
+#endif
int page_count;
int next_free;
struct btrfs_work work;
};
struct scrub_block {
- struct scrub_page pagev[SCRUB_MAX_PAGES_PER_BLOCK];
+ struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
int page_count;
atomic_t outstanding_pages;
atomic_t ref_count; /* free mem on transition to zero */
- struct scrub_dev *sdev;
+ struct scrub_ctx *sctx;
struct {
unsigned int header_error:1;
unsigned int checksum_error:1;
};
};
-struct scrub_dev {
- struct scrub_bio *bios[SCRUB_BIOS_PER_DEV];
- struct btrfs_device *dev;
+struct scrub_wr_ctx {
+ struct scrub_bio *wr_curr_bio;
+ struct btrfs_device *tgtdev;
+ int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
+ atomic_t flush_all_writes;
+ struct mutex wr_lock;
+};
+
+struct scrub_ctx {
+ struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
+ struct btrfs_root *dev_root;
int first_free;
int curr;
- atomic_t in_flight;
- atomic_t fixup_cnt;
+ atomic_t bios_in_flight;
+ atomic_t workers_pending;
spinlock_t list_lock;
wait_queue_head_t list_wait;
u16 csum_size;
struct list_head csum_list;
atomic_t cancel_req;
int readonly;
- int pages_per_bio; /* <= SCRUB_PAGES_PER_BIO */
+ int pages_per_rd_bio;
u32 sectorsize;
u32 nodesize;
u32 leafsize;
+
+ int is_dev_replace;
+ struct scrub_wr_ctx wr_ctx;
+
/*
* statistics
*/
};
struct scrub_fixup_nodatasum {
- struct scrub_dev *sdev;
+ struct scrub_ctx *sctx;
+ struct btrfs_device *dev;
u64 logical;
struct btrfs_root *root;
struct btrfs_work work;
int mirror_num;
};
+struct scrub_copy_nocow_ctx {
+ struct scrub_ctx *sctx;
+ u64 logical;
+ u64 len;
+ int mirror_num;
+ u64 physical_for_dev_replace;
+ struct btrfs_work work;
+};
+
struct scrub_warning {
struct btrfs_path *path;
u64 extent_item_size;
};
+static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
+static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
+static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
+static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx);
static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
-static int scrub_setup_recheck_block(struct scrub_dev *sdev,
- struct btrfs_mapping_tree *map_tree,
+static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
+ struct btrfs_fs_info *fs_info,
+ struct scrub_block *original_sblock,
u64 length, u64 logical,
- struct scrub_block *sblock);
-static int scrub_recheck_block(struct btrfs_fs_info *fs_info,
- struct scrub_block *sblock, int is_metadata,
- int have_csum, u8 *csum, u64 generation,
- u16 csum_size);
+ struct scrub_block *sblocks_for_recheck);
+static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
+ struct scrub_block *sblock, int is_metadata,
+ int have_csum, u8 *csum, u64 generation,
+ u16 csum_size);
static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
struct scrub_block *sblock,
int is_metadata, int have_csum,
static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
struct scrub_block *sblock_good,
int page_num, int force_write);
+static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
+static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
+ int page_num);
static int scrub_checksum_data(struct scrub_block *sblock);
static int scrub_checksum_tree_block(struct scrub_block *sblock);
static int scrub_checksum_super(struct scrub_block *sblock);
static void scrub_block_get(struct scrub_block *sblock);
static void scrub_block_put(struct scrub_block *sblock);
-static int scrub_add_page_to_bio(struct scrub_dev *sdev,
- struct scrub_page *spage);
-static int scrub_pages(struct scrub_dev *sdev, u64 logical, u64 len,
- u64 physical, u64 flags, u64 gen, int mirror_num,
- u8 *csum, int force);
+static void scrub_page_get(struct scrub_page *spage);
+static void scrub_page_put(struct scrub_page *spage);
+static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
+ struct scrub_page *spage);
+static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
+ u64 physical, struct btrfs_device *dev, u64 flags,
+ u64 gen, int mirror_num, u8 *csum, int force,
+ u64 physical_for_dev_replace);
static void scrub_bio_end_io(struct bio *bio, int err);
static void scrub_bio_end_io_worker(struct btrfs_work *work);
static void scrub_block_complete(struct scrub_block *sblock);
+static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
+ u64 extent_logical, u64 extent_len,
+ u64 *extent_physical,
+ struct btrfs_device **extent_dev,
+ int *extent_mirror_num);
+static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
+ struct scrub_wr_ctx *wr_ctx,
+ struct btrfs_fs_info *fs_info,
+ struct btrfs_device *dev,
+ int is_dev_replace);
+static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
+static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
+ struct scrub_page *spage);
+static void scrub_wr_submit(struct scrub_ctx *sctx);
+static void scrub_wr_bio_end_io(struct bio *bio, int err);
+static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
+static int write_page_nocow(struct scrub_ctx *sctx,
+ u64 physical_for_dev_replace, struct page *page);
+static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
+ void *ctx);
+static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
+ int mirror_num, u64 physical_for_dev_replace);
+static void copy_nocow_pages_worker(struct btrfs_work *work);
+
+
+static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
+{
+ atomic_inc(&sctx->bios_in_flight);
+}
+
+static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
+{
+ atomic_dec(&sctx->bios_in_flight);
+ wake_up(&sctx->list_wait);
+}
+
+/*
+ * used for workers that require transaction commits (i.e., for the
+ * NOCOW case)
+ */
+static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
+{
+ struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+
+ /*
+ * increment scrubs_running to prevent cancel requests from
+ * completing as long as a worker is running. we must also
+ * increment scrubs_paused to prevent deadlocking on pause
+ * requests used for transactions commits (as the worker uses a
+ * transaction context). it is safe to regard the worker
+ * as paused for all matters practical. effectively, we only
+ * avoid cancellation requests from completing.
+ */
+ mutex_lock(&fs_info->scrub_lock);
+ atomic_inc(&fs_info->scrubs_running);
+ atomic_inc(&fs_info->scrubs_paused);
+ mutex_unlock(&fs_info->scrub_lock);
+ atomic_inc(&sctx->workers_pending);
+}
+/* used for workers that require transaction commits */
+static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
+{
+ struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
-static void scrub_free_csums(struct scrub_dev *sdev)
+ /*
+ * see scrub_pending_trans_workers_inc() why we're pretending
+ * to be paused in the scrub counters
+ */
+ mutex_lock(&fs_info->scrub_lock);
+ atomic_dec(&fs_info->scrubs_running);
+ atomic_dec(&fs_info->scrubs_paused);
+ mutex_unlock(&fs_info->scrub_lock);
+ atomic_dec(&sctx->workers_pending);
+ wake_up(&fs_info->scrub_pause_wait);
+ wake_up(&sctx->list_wait);
+}
+
+static void scrub_free_csums(struct scrub_ctx *sctx)
{
- while (!list_empty(&sdev->csum_list)) {
+ while (!list_empty(&sctx->csum_list)) {
struct btrfs_ordered_sum *sum;
- sum = list_first_entry(&sdev->csum_list,
+ sum = list_first_entry(&sctx->csum_list,
struct btrfs_ordered_sum, list);
list_del(&sum->list);
kfree(sum);
}
}
-static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev)
+static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
{
int i;
- if (!sdev)
+ if (!sctx)
return;
+ scrub_free_wr_ctx(&sctx->wr_ctx);
+
/* this can happen when scrub is cancelled */
- if (sdev->curr != -1) {
- struct scrub_bio *sbio = sdev->bios[sdev->curr];
+ if (sctx->curr != -1) {
+ struct scrub_bio *sbio = sctx->bios[sctx->curr];
for (i = 0; i < sbio->page_count; i++) {
- BUG_ON(!sbio->pagev[i]);
- BUG_ON(!sbio->pagev[i]->page);
+ WARN_ON(!sbio->pagev[i]->page);
scrub_block_put(sbio->pagev[i]->sblock);
}
bio_put(sbio->bio);
}
- for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) {
- struct scrub_bio *sbio = sdev->bios[i];
+ for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
+ struct scrub_bio *sbio = sctx->bios[i];
if (!sbio)
break;
kfree(sbio);
}
- scrub_free_csums(sdev);
- kfree(sdev);
+ scrub_free_csums(sctx);
+ kfree(sctx);
}
static noinline_for_stack
-struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev)
+struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
{
- struct scrub_dev *sdev;
+ struct scrub_ctx *sctx;
int i;
struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
- int pages_per_bio;
+ int pages_per_rd_bio;
+ int ret;
- pages_per_bio = min_t(int, SCRUB_PAGES_PER_BIO,
- bio_get_nr_vecs(dev->bdev));
- sdev = kzalloc(sizeof(*sdev), GFP_NOFS);
- if (!sdev)
+ /*
+ * the setting of pages_per_rd_bio is correct for scrub but might
+ * be wrong for the dev_replace code where we might read from
+ * different devices in the initial huge bios. However, that
+ * code is able to correctly handle the case when adding a page
+ * to a bio fails.
+ */
+ if (dev->bdev)
+ pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO,
+ bio_get_nr_vecs(dev->bdev));
+ else
+ pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
+ sctx = kzalloc(sizeof(*sctx), GFP_NOFS);
+ if (!sctx)
goto nomem;
- sdev->dev = dev;
- sdev->pages_per_bio = pages_per_bio;
- sdev->curr = -1;
- for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) {
+ sctx->is_dev_replace = is_dev_replace;
+ sctx->pages_per_rd_bio = pages_per_rd_bio;
+ sctx->curr = -1;
+ sctx->dev_root = dev->dev_root;
+ for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
struct scrub_bio *sbio;
sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
if (!sbio)
goto nomem;
- sdev->bios[i] = sbio;
+ sctx->bios[i] = sbio;
sbio->index = i;
- sbio->sdev = sdev;
+ sbio->sctx = sctx;
sbio->page_count = 0;
sbio->work.func = scrub_bio_end_io_worker;
- if (i != SCRUB_BIOS_PER_DEV-1)
- sdev->bios[i]->next_free = i + 1;
+ if (i != SCRUB_BIOS_PER_SCTX - 1)
+ sctx->bios[i]->next_free = i + 1;
else
- sdev->bios[i]->next_free = -1;
- }
- sdev->first_free = 0;
- sdev->nodesize = dev->dev_root->nodesize;
- sdev->leafsize = dev->dev_root->leafsize;
- sdev->sectorsize = dev->dev_root->sectorsize;
- atomic_set(&sdev->in_flight, 0);
- atomic_set(&sdev->fixup_cnt, 0);
- atomic_set(&sdev->cancel_req, 0);
- sdev->csum_size = btrfs_super_csum_size(fs_info->super_copy);
- INIT_LIST_HEAD(&sdev->csum_list);
-
- spin_lock_init(&sdev->list_lock);
- spin_lock_init(&sdev->stat_lock);
- init_waitqueue_head(&sdev->list_wait);
- return sdev;
+ sctx->bios[i]->next_free = -1;
+ }
+ sctx->first_free = 0;
+ sctx->nodesize = dev->dev_root->nodesize;
+ sctx->leafsize = dev->dev_root->leafsize;
+ sctx->sectorsize = dev->dev_root->sectorsize;
+ atomic_set(&sctx->bios_in_flight, 0);
+ atomic_set(&sctx->workers_pending, 0);
+ atomic_set(&sctx->cancel_req, 0);
+ sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
+ INIT_LIST_HEAD(&sctx->csum_list);
+
+ spin_lock_init(&sctx->list_lock);
+ spin_lock_init(&sctx->stat_lock);
+ init_waitqueue_head(&sctx->list_wait);
+
+ ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info,
+ fs_info->dev_replace.tgtdev, is_dev_replace);
+ if (ret) {
+ scrub_free_ctx(sctx);
+ return ERR_PTR(ret);
+ }
+ return sctx;
nomem:
- scrub_free_dev(sdev);
+ scrub_free_ctx(sctx);
return ERR_PTR(-ENOMEM);
}
-static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx)
+static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
+ void *warn_ctx)
{
u64 isize;
u32 nlink;
int i;
struct extent_buffer *eb;
struct btrfs_inode_item *inode_item;
- struct scrub_warning *swarn = ctx;
+ struct scrub_warning *swarn = warn_ctx;
struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
struct inode_fs_paths *ipath = NULL;
struct btrfs_root *local_root;
static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
{
- struct btrfs_device *dev = sblock->sdev->dev;
- struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
+ struct btrfs_device *dev;
+ struct btrfs_fs_info *fs_info;
struct btrfs_path *path;
struct btrfs_key found_key;
struct extent_buffer *eb;
const int bufsize = 4096;
int ret;
+ WARN_ON(sblock->page_count < 1);
+ dev = sblock->pagev[0]->dev;
+ fs_info = sblock->sctx->dev_root->fs_info;
+
path = btrfs_alloc_path();
swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS);
swarn.msg_buf = kmalloc(bufsize, GFP_NOFS);
- BUG_ON(sblock->page_count < 1);
- swarn.sector = (sblock->pagev[0].physical) >> 9;
- swarn.logical = sblock->pagev[0].logical;
+ swarn.sector = (sblock->pagev[0]->physical) >> 9;
+ swarn.logical = sblock->pagev[0]->logical;
swarn.errstr = errstr;
- swarn.dev = dev;
+ swarn.dev = NULL;
swarn.msg_bufsize = bufsize;
swarn.scratch_bufsize = bufsize;
} while (ret != 1);
} else {
swarn.path = path;
+ swarn.dev = dev;
iterate_extent_inodes(fs_info, found_key.objectid,
extent_item_pos, 1,
scrub_print_warning_inode, &swarn);
kfree(swarn.msg_buf);
}
-static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *ctx)
+static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
{
struct page *page = NULL;
unsigned long index;
- struct scrub_fixup_nodatasum *fixup = ctx;
+ struct scrub_fixup_nodatasum *fixup = fixup_ctx;
int ret;
int corrected = 0;
struct btrfs_key key;
}
if (PageUptodate(page)) {
- struct btrfs_mapping_tree *map_tree;
+ struct btrfs_fs_info *fs_info;
if (PageDirty(page)) {
/*
* we need to write the data to the defect sector. the
ret = -EIO;
goto out;
}
- map_tree = &BTRFS_I(inode)->root->fs_info->mapping_tree;
- ret = repair_io_failure(map_tree, offset, PAGE_SIZE,
+ fs_info = BTRFS_I(inode)->root->fs_info;
+ ret = repair_io_failure(fs_info, offset, PAGE_SIZE,
fixup->logical, page,
fixup->mirror_num);
unlock_page(page);
{
int ret;
struct scrub_fixup_nodatasum *fixup;
- struct scrub_dev *sdev;
+ struct scrub_ctx *sctx;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_fs_info *fs_info;
struct btrfs_path *path;
int uncorrectable = 0;
fixup = container_of(work, struct scrub_fixup_nodatasum, work);
- sdev = fixup->sdev;
+ sctx = fixup->sctx;
fs_info = fixup->root->fs_info;
path = btrfs_alloc_path();
if (!path) {
- spin_lock(&sdev->stat_lock);
- ++sdev->stat.malloc_errors;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ ++sctx->stat.malloc_errors;
+ spin_unlock(&sctx->stat_lock);
uncorrectable = 1;
goto out;
}
}
WARN_ON(ret != 1);
- spin_lock(&sdev->stat_lock);
- ++sdev->stat.corrected_errors;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ ++sctx->stat.corrected_errors;
+ spin_unlock(&sctx->stat_lock);
out:
if (trans && !IS_ERR(trans))
btrfs_end_transaction(trans, fixup->root);
if (uncorrectable) {
- spin_lock(&sdev->stat_lock);
- ++sdev->stat.uncorrectable_errors;
- spin_unlock(&sdev->stat_lock);
-
+ spin_lock(&sctx->stat_lock);
+ ++sctx->stat.uncorrectable_errors;
+ spin_unlock(&sctx->stat_lock);
+ btrfs_dev_replace_stats_inc(
+ &sctx->dev_root->fs_info->dev_replace.
+ num_uncorrectable_read_errors);
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n",
(unsigned long long)fixup->logical,
- rcu_str_deref(sdev->dev->name));
+ rcu_str_deref(fixup->dev->name));
}
btrfs_free_path(path);
kfree(fixup);
- /* see caller why we're pretending to be paused in the scrub counters */
- mutex_lock(&fs_info->scrub_lock);
- atomic_dec(&fs_info->scrubs_running);
- atomic_dec(&fs_info->scrubs_paused);
- mutex_unlock(&fs_info->scrub_lock);
- atomic_dec(&sdev->fixup_cnt);
- wake_up(&fs_info->scrub_pause_wait);
- wake_up(&sdev->list_wait);
+ scrub_pending_trans_workers_dec(sctx);
}
/*
*/
static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
{
- struct scrub_dev *sdev = sblock_to_check->sdev;
+ struct scrub_ctx *sctx = sblock_to_check->sctx;
+ struct btrfs_device *dev;
struct btrfs_fs_info *fs_info;
u64 length;
u64 logical;
DEFAULT_RATELIMIT_BURST);
BUG_ON(sblock_to_check->page_count < 1);
- fs_info = sdev->dev->dev_root->fs_info;
+ fs_info = sctx->dev_root->fs_info;
+ if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
+ /*
+ * if we find an error in a super block, we just report it.
+ * They will get written with the next transaction commit
+ * anyway
+ */
+ spin_lock(&sctx->stat_lock);
+ ++sctx->stat.super_errors;
+ spin_unlock(&sctx->stat_lock);
+ return 0;
+ }
length = sblock_to_check->page_count * PAGE_SIZE;
- logical = sblock_to_check->pagev[0].logical;
- generation = sblock_to_check->pagev[0].generation;
- BUG_ON(sblock_to_check->pagev[0].mirror_num < 1);
- failed_mirror_index = sblock_to_check->pagev[0].mirror_num - 1;
- is_metadata = !(sblock_to_check->pagev[0].flags &
+ logical = sblock_to_check->pagev[0]->logical;
+ generation = sblock_to_check->pagev[0]->generation;
+ BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
+ failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
+ is_metadata = !(sblock_to_check->pagev[0]->flags &
BTRFS_EXTENT_FLAG_DATA);
- have_csum = sblock_to_check->pagev[0].have_csum;
- csum = sblock_to_check->pagev[0].csum;
+ have_csum = sblock_to_check->pagev[0]->have_csum;
+ csum = sblock_to_check->pagev[0]->csum;
+ dev = sblock_to_check->pagev[0]->dev;
+
+ if (sctx->is_dev_replace && !is_metadata && !have_csum) {
+ sblocks_for_recheck = NULL;
+ goto nodatasum_case;
+ }
/*
* read all mirrors one after the other. This includes to
sizeof(*sblocks_for_recheck),
GFP_NOFS);
if (!sblocks_for_recheck) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.malloc_errors++;
- sdev->stat.read_errors++;
- sdev->stat.uncorrectable_errors++;
- spin_unlock(&sdev->stat_lock);
- btrfs_dev_stat_inc_and_print(sdev->dev,
- BTRFS_DEV_STAT_READ_ERRS);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ sctx->stat.read_errors++;
+ sctx->stat.uncorrectable_errors++;
+ spin_unlock(&sctx->stat_lock);
+ btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
goto out;
}
/* setup the context, map the logical blocks and alloc the pages */
- ret = scrub_setup_recheck_block(sdev, &fs_info->mapping_tree, length,
+ ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length,
logical, sblocks_for_recheck);
if (ret) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.read_errors++;
- sdev->stat.uncorrectable_errors++;
- spin_unlock(&sdev->stat_lock);
- btrfs_dev_stat_inc_and_print(sdev->dev,
- BTRFS_DEV_STAT_READ_ERRS);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.read_errors++;
+ sctx->stat.uncorrectable_errors++;
+ spin_unlock(&sctx->stat_lock);
+ btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
goto out;
}
BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
sblock_bad = sblocks_for_recheck + failed_mirror_index;
/* build and submit the bios for the failed mirror, check checksums */
- ret = scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum,
- csum, generation, sdev->csum_size);
- if (ret) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.read_errors++;
- sdev->stat.uncorrectable_errors++;
- spin_unlock(&sdev->stat_lock);
- btrfs_dev_stat_inc_and_print(sdev->dev,
- BTRFS_DEV_STAT_READ_ERRS);
- goto out;
- }
+ scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum,
+ csum, generation, sctx->csum_size);
if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
sblock_bad->no_io_error_seen) {
* different bio (usually one of the two latter cases is
* the cause)
*/
- spin_lock(&sdev->stat_lock);
- sdev->stat.unverified_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.unverified_errors++;
+ spin_unlock(&sctx->stat_lock);
+ if (sctx->is_dev_replace)
+ scrub_write_block_to_dev_replace(sblock_bad);
goto out;
}
if (!sblock_bad->no_io_error_seen) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.read_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.read_errors++;
+ spin_unlock(&sctx->stat_lock);
if (__ratelimit(&_rs))
scrub_print_warning("i/o error", sblock_to_check);
- btrfs_dev_stat_inc_and_print(sdev->dev,
- BTRFS_DEV_STAT_READ_ERRS);
+ btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
} else if (sblock_bad->checksum_error) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.csum_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.csum_errors++;
+ spin_unlock(&sctx->stat_lock);
if (__ratelimit(&_rs))
scrub_print_warning("checksum error", sblock_to_check);
- btrfs_dev_stat_inc_and_print(sdev->dev,
+ btrfs_dev_stat_inc_and_print(dev,
BTRFS_DEV_STAT_CORRUPTION_ERRS);
} else if (sblock_bad->header_error) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.verify_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.verify_errors++;
+ spin_unlock(&sctx->stat_lock);
if (__ratelimit(&_rs))
scrub_print_warning("checksum/header error",
sblock_to_check);
if (sblock_bad->generation_error)
- btrfs_dev_stat_inc_and_print(sdev->dev,
+ btrfs_dev_stat_inc_and_print(dev,
BTRFS_DEV_STAT_GENERATION_ERRS);
else
- btrfs_dev_stat_inc_and_print(sdev->dev,
+ btrfs_dev_stat_inc_and_print(dev,
BTRFS_DEV_STAT_CORRUPTION_ERRS);
}
- if (sdev->readonly)
+ if (sctx->readonly && !sctx->is_dev_replace)
goto did_not_correct_error;
if (!is_metadata && !have_csum) {
struct scrub_fixup_nodatasum *fixup_nodatasum;
+nodatasum_case:
+ WARN_ON(sctx->is_dev_replace);
+
/*
* !is_metadata and !have_csum, this means that the data
* might not be COW'ed, that it might be modified
fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS);
if (!fixup_nodatasum)
goto did_not_correct_error;
- fixup_nodatasum->sdev = sdev;
+ fixup_nodatasum->sctx = sctx;
+ fixup_nodatasum->dev = dev;
fixup_nodatasum->logical = logical;
fixup_nodatasum->root = fs_info->extent_root;
fixup_nodatasum->mirror_num = failed_mirror_index + 1;
- /*
- * increment scrubs_running to prevent cancel requests from
- * completing as long as a fixup worker is running. we must also
- * increment scrubs_paused to prevent deadlocking on pause
- * requests used for transactions commits (as the worker uses a
- * transaction context). it is safe to regard the fixup worker
- * as paused for all matters practical. effectively, we only
- * avoid cancellation requests from completing.
- */
- mutex_lock(&fs_info->scrub_lock);
- atomic_inc(&fs_info->scrubs_running);
- atomic_inc(&fs_info->scrubs_paused);
- mutex_unlock(&fs_info->scrub_lock);
- atomic_inc(&sdev->fixup_cnt);
+ scrub_pending_trans_workers_inc(sctx);
fixup_nodatasum->work.func = scrub_fixup_nodatasum;
btrfs_queue_worker(&fs_info->scrub_workers,
&fixup_nodatasum->work);
/*
* now build and submit the bios for the other mirrors, check
- * checksums
- */
- for (mirror_index = 0;
- mirror_index < BTRFS_MAX_MIRRORS &&
- sblocks_for_recheck[mirror_index].page_count > 0;
- mirror_index++) {
- if (mirror_index == failed_mirror_index)
- continue;
-
- /* build and submit the bios, check checksums */
- ret = scrub_recheck_block(fs_info,
- sblocks_for_recheck + mirror_index,
- is_metadata, have_csum, csum,
- generation, sdev->csum_size);
- if (ret)
- goto did_not_correct_error;
- }
-
- /*
- * first try to pick the mirror which is completely without I/O
+ * checksums.
+ * First try to pick the mirror which is completely without I/O
* errors and also does not have a checksum error.
* If one is found, and if a checksum is present, the full block
* that is known to contain an error is rewritten. Afterwards
mirror_index < BTRFS_MAX_MIRRORS &&
sblocks_for_recheck[mirror_index].page_count > 0;
mirror_index++) {
- struct scrub_block *sblock_other = sblocks_for_recheck +
- mirror_index;
+ struct scrub_block *sblock_other;
+
+ if (mirror_index == failed_mirror_index)
+ continue;
+ sblock_other = sblocks_for_recheck + mirror_index;
+
+ /* build and submit the bios, check checksums */
+ scrub_recheck_block(fs_info, sblock_other, is_metadata,
+ have_csum, csum, generation,
+ sctx->csum_size);
if (!sblock_other->header_error &&
!sblock_other->checksum_error &&
sblock_other->no_io_error_seen) {
- int force_write = is_metadata || have_csum;
-
- ret = scrub_repair_block_from_good_copy(sblock_bad,
- sblock_other,
- force_write);
+ if (sctx->is_dev_replace) {
+ scrub_write_block_to_dev_replace(sblock_other);
+ } else {
+ int force_write = is_metadata || have_csum;
+
+ ret = scrub_repair_block_from_good_copy(
+ sblock_bad, sblock_other,
+ force_write);
+ }
if (0 == ret)
goto corrected_error;
}
}
/*
- * in case of I/O errors in the area that is supposed to be
+ * for dev_replace, pick good pages and write to the target device.
+ */
+ if (sctx->is_dev_replace) {
+ success = 1;
+ for (page_num = 0; page_num < sblock_bad->page_count;
+ page_num++) {
+ int sub_success;
+
+ sub_success = 0;
+ for (mirror_index = 0;
+ mirror_index < BTRFS_MAX_MIRRORS &&
+ sblocks_for_recheck[mirror_index].page_count > 0;
+ mirror_index++) {
+ struct scrub_block *sblock_other =
+ sblocks_for_recheck + mirror_index;
+ struct scrub_page *page_other =
+ sblock_other->pagev[page_num];
+
+ if (!page_other->io_error) {
+ ret = scrub_write_page_to_dev_replace(
+ sblock_other, page_num);
+ if (ret == 0) {
+ /* succeeded for this page */
+ sub_success = 1;
+ break;
+ } else {
+ btrfs_dev_replace_stats_inc(
+ &sctx->dev_root->
+ fs_info->dev_replace.
+ num_write_errors);
+ }
+ }
+ }
+
+ if (!sub_success) {
+ /*
+ * did not find a mirror to fetch the page
+ * from. scrub_write_page_to_dev_replace()
+ * handles this case (page->io_error), by
+ * filling the block with zeros before
+ * submitting the write request
+ */
+ success = 0;
+ ret = scrub_write_page_to_dev_replace(
+ sblock_bad, page_num);
+ if (ret)
+ btrfs_dev_replace_stats_inc(
+ &sctx->dev_root->fs_info->
+ dev_replace.num_write_errors);
+ }
+ }
+
+ goto out;
+ }
+
+ /*
+ * for regular scrub, repair those pages that are errored.
+ * In case of I/O errors in the area that is supposed to be
* repaired, continue by picking good copies of those pages.
* Select the good pages from mirrors to rewrite bad pages from
* the area to fix. Afterwards verify the checksum of the block
success = 1;
for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
- struct scrub_page *page_bad = sblock_bad->pagev + page_num;
+ struct scrub_page *page_bad = sblock_bad->pagev[page_num];
if (!page_bad->io_error)
continue;
mirror_index++) {
struct scrub_block *sblock_other = sblocks_for_recheck +
mirror_index;
- struct scrub_page *page_other = sblock_other->pagev +
- page_num;
+ struct scrub_page *page_other = sblock_other->pagev[
+ page_num];
if (!page_other->io_error) {
ret = scrub_repair_page_from_good_copy(
* is verified, but most likely the data comes out
* of the page cache.
*/
- ret = scrub_recheck_block(fs_info, sblock_bad,
- is_metadata, have_csum, csum,
- generation, sdev->csum_size);
- if (!ret && !sblock_bad->header_error &&
+ scrub_recheck_block(fs_info, sblock_bad,
+ is_metadata, have_csum, csum,
+ generation, sctx->csum_size);
+ if (!sblock_bad->header_error &&
!sblock_bad->checksum_error &&
sblock_bad->no_io_error_seen)
goto corrected_error;
goto did_not_correct_error;
} else {
corrected_error:
- spin_lock(&sdev->stat_lock);
- sdev->stat.corrected_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.corrected_errors++;
+ spin_unlock(&sctx->stat_lock);
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: fixed up error at logical %llu on dev %s\n",
(unsigned long long)logical,
- rcu_str_deref(sdev->dev->name));
+ rcu_str_deref(dev->name));
}
} else {
did_not_correct_error:
- spin_lock(&sdev->stat_lock);
- sdev->stat.uncorrectable_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.uncorrectable_errors++;
+ spin_unlock(&sctx->stat_lock);
printk_ratelimited_in_rcu(KERN_ERR
"btrfs: unable to fixup (regular) error at logical %llu on dev %s\n",
(unsigned long long)logical,
- rcu_str_deref(sdev->dev->name));
+ rcu_str_deref(dev->name));
}
out:
mirror_index;
int page_index;
- for (page_index = 0; page_index < SCRUB_PAGES_PER_BIO;
- page_index++)
- if (sblock->pagev[page_index].page)
- __free_page(
- sblock->pagev[page_index].page);
+ for (page_index = 0; page_index < sblock->page_count;
+ page_index++) {
+ sblock->pagev[page_index]->sblock = NULL;
+ scrub_page_put(sblock->pagev[page_index]);
+ }
}
kfree(sblocks_for_recheck);
}
return 0;
}
-static int scrub_setup_recheck_block(struct scrub_dev *sdev,
- struct btrfs_mapping_tree *map_tree,
+static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
+ struct btrfs_fs_info *fs_info,
+ struct scrub_block *original_sblock,
u64 length, u64 logical,
struct scrub_block *sblocks_for_recheck)
{
int ret;
/*
- * note: the three members sdev, ref_count and outstanding_pages
+ * note: the two members ref_count and outstanding_pages
* are not used (and not set) in the blocks that are used for
* the recheck procedure
*/
* with a length of PAGE_SIZE, each returned stripe
* represents one mirror
*/
- ret = btrfs_map_block(map_tree, WRITE, logical, &mapped_length,
- &bbio, 0);
+ ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical,
+ &mapped_length, &bbio, 0);
if (ret || !bbio || mapped_length < sublen) {
kfree(bbio);
return -EIO;
}
- BUG_ON(page_index >= SCRUB_PAGES_PER_BIO);
+ BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
for (mirror_index = 0; mirror_index < (int)bbio->num_stripes;
mirror_index++) {
struct scrub_block *sblock;
continue;
sblock = sblocks_for_recheck + mirror_index;
- page = sblock->pagev + page_index;
+ sblock->sctx = sctx;
+ page = kzalloc(sizeof(*page), GFP_NOFS);
+ if (!page) {
+leave_nomem:
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ spin_unlock(&sctx->stat_lock);
+ kfree(bbio);
+ return -ENOMEM;
+ }
+ scrub_page_get(page);
+ sblock->pagev[page_index] = page;
page->logical = logical;
page->physical = bbio->stripes[mirror_index].physical;
+ BUG_ON(page_index >= original_sblock->page_count);
+ page->physical_for_dev_replace =
+ original_sblock->pagev[page_index]->
+ physical_for_dev_replace;
/* for missing devices, dev->bdev is NULL */
page->dev = bbio->stripes[mirror_index].dev;
page->mirror_num = mirror_index + 1;
- page->page = alloc_page(GFP_NOFS);
- if (!page->page) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.malloc_errors++;
- spin_unlock(&sdev->stat_lock);
- kfree(bbio);
- return -ENOMEM;
- }
sblock->page_count++;
+ page->page = alloc_page(GFP_NOFS);
+ if (!page->page)
+ goto leave_nomem;
}
kfree(bbio);
length -= sublen;
* to take those pages that are not errored from all the mirrors so that
* the pages that are errored in the just handled mirror can be repaired.
*/
-static int scrub_recheck_block(struct btrfs_fs_info *fs_info,
- struct scrub_block *sblock, int is_metadata,
- int have_csum, u8 *csum, u64 generation,
- u16 csum_size)
+static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
+ struct scrub_block *sblock, int is_metadata,
+ int have_csum, u8 *csum, u64 generation,
+ u16 csum_size)
{
int page_num;
for (page_num = 0; page_num < sblock->page_count; page_num++) {
struct bio *bio;
- int ret;
- struct scrub_page *page = sblock->pagev + page_num;
+ struct scrub_page *page = sblock->pagev[page_num];
DECLARE_COMPLETION_ONSTACK(complete);
if (page->dev->bdev == NULL) {
continue;
}
- BUG_ON(!page->page);
+ WARN_ON(!page->page);
bio = bio_alloc(GFP_NOFS, 1);
- if (!bio)
- return -EIO;
+ if (!bio) {
+ page->io_error = 1;
+ sblock->no_io_error_seen = 0;
+ continue;
+ }
bio->bi_bdev = page->dev->bdev;
bio->bi_sector = page->physical >> 9;
bio->bi_end_io = scrub_complete_bio_end_io;
bio->bi_private = &complete;
- ret = bio_add_page(bio, page->page, PAGE_SIZE, 0);
- if (PAGE_SIZE != ret) {
- bio_put(bio);
- return -EIO;
- }
+ bio_add_page(bio, page->page, PAGE_SIZE, 0);
btrfsic_submit_bio(READ, bio);
/* this will also unplug the queue */
have_csum, csum, generation,
csum_size);
- return 0;
+ return;
}
static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
struct btrfs_root *root = fs_info->extent_root;
void *mapped_buffer;
- BUG_ON(!sblock->pagev[0].page);
+ WARN_ON(!sblock->pagev[0]->page);
if (is_metadata) {
struct btrfs_header *h;
- mapped_buffer = kmap_atomic(sblock->pagev[0].page);
+ mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
h = (struct btrfs_header *)mapped_buffer;
- if (sblock->pagev[0].logical != le64_to_cpu(h->bytenr) ||
+ if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr) ||
memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) ||
memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
BTRFS_UUID_SIZE)) {
if (!have_csum)
return;
- mapped_buffer = kmap_atomic(sblock->pagev[0].page);
+ mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
}
for (page_num = 0;;) {
page_num++;
if (page_num >= sblock->page_count)
break;
- BUG_ON(!sblock->pagev[page_num].page);
+ WARN_ON(!sblock->pagev[page_num]->page);
- mapped_buffer = kmap_atomic(sblock->pagev[page_num].page);
+ mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page);
}
btrfs_csum_final(crc, calculated_csum);
struct scrub_block *sblock_good,
int page_num, int force_write)
{
- struct scrub_page *page_bad = sblock_bad->pagev + page_num;
- struct scrub_page *page_good = sblock_good->pagev + page_num;
+ struct scrub_page *page_bad = sblock_bad->pagev[page_num];
+ struct scrub_page *page_good = sblock_good->pagev[page_num];
- BUG_ON(sblock_bad->pagev[page_num].page == NULL);
- BUG_ON(sblock_good->pagev[page_num].page == NULL);
+ BUG_ON(page_bad->page == NULL);
+ BUG_ON(page_good->page == NULL);
if (force_write || sblock_bad->header_error ||
sblock_bad->checksum_error || page_bad->io_error) {
struct bio *bio;
int ret;
DECLARE_COMPLETION_ONSTACK(complete);
+ if (!page_bad->dev->bdev) {
+ printk_ratelimited(KERN_WARNING
+ "btrfs: scrub_repair_page_from_good_copy(bdev == NULL) is unexpected!\n");
+ return -EIO;
+ }
+
bio = bio_alloc(GFP_NOFS, 1);
if (!bio)
return -EIO;
if (!bio_flagged(bio, BIO_UPTODATE)) {
btrfs_dev_stat_inc_and_print(page_bad->dev,
BTRFS_DEV_STAT_WRITE_ERRS);
+ btrfs_dev_replace_stats_inc(
+ &sblock_bad->sctx->dev_root->fs_info->
+ dev_replace.num_write_errors);
bio_put(bio);
return -EIO;
}
return 0;
}
-static void scrub_checksum(struct scrub_block *sblock)
+static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
+{
+ int page_num;
+
+ for (page_num = 0; page_num < sblock->page_count; page_num++) {
+ int ret;
+
+ ret = scrub_write_page_to_dev_replace(sblock, page_num);
+ if (ret)
+ btrfs_dev_replace_stats_inc(
+ &sblock->sctx->dev_root->fs_info->dev_replace.
+ num_write_errors);
+ }
+}
+
+static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
+ int page_num)
+{
+ struct scrub_page *spage = sblock->pagev[page_num];
+
+ BUG_ON(spage->page == NULL);
+ if (spage->io_error) {
+ void *mapped_buffer = kmap_atomic(spage->page);
+
+ memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
+ flush_dcache_page(spage->page);
+ kunmap_atomic(mapped_buffer);
+ }
+ return scrub_add_page_to_wr_bio(sblock->sctx, spage);
+}
+
+static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
+ struct scrub_page *spage)
+{
+ struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
+ struct scrub_bio *sbio;
+ int ret;
+
+ mutex_lock(&wr_ctx->wr_lock);
+again:
+ if (!wr_ctx->wr_curr_bio) {
+ wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio),
+ GFP_NOFS);
+ if (!wr_ctx->wr_curr_bio) {
+ mutex_unlock(&wr_ctx->wr_lock);
+ return -ENOMEM;
+ }
+ wr_ctx->wr_curr_bio->sctx = sctx;
+ wr_ctx->wr_curr_bio->page_count = 0;
+ }
+ sbio = wr_ctx->wr_curr_bio;
+ if (sbio->page_count == 0) {
+ struct bio *bio;
+
+ sbio->physical = spage->physical_for_dev_replace;
+ sbio->logical = spage->logical;
+ sbio->dev = wr_ctx->tgtdev;
+ bio = sbio->bio;
+ if (!bio) {
+ bio = bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio);
+ if (!bio) {
+ mutex_unlock(&wr_ctx->wr_lock);
+ return -ENOMEM;
+ }
+ sbio->bio = bio;
+ }
+
+ bio->bi_private = sbio;
+ bio->bi_end_io = scrub_wr_bio_end_io;
+ bio->bi_bdev = sbio->dev->bdev;
+ bio->bi_sector = sbio->physical >> 9;
+ sbio->err = 0;
+ } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
+ spage->physical_for_dev_replace ||
+ sbio->logical + sbio->page_count * PAGE_SIZE !=
+ spage->logical) {
+ scrub_wr_submit(sctx);
+ goto again;
+ }
+
+ ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
+ if (ret != PAGE_SIZE) {
+ if (sbio->page_count < 1) {
+ bio_put(sbio->bio);
+ sbio->bio = NULL;
+ mutex_unlock(&wr_ctx->wr_lock);
+ return -EIO;
+ }
+ scrub_wr_submit(sctx);
+ goto again;
+ }
+
+ sbio->pagev[sbio->page_count] = spage;
+ scrub_page_get(spage);
+ sbio->page_count++;
+ if (sbio->page_count == wr_ctx->pages_per_wr_bio)
+ scrub_wr_submit(sctx);
+ mutex_unlock(&wr_ctx->wr_lock);
+
+ return 0;
+}
+
+static void scrub_wr_submit(struct scrub_ctx *sctx)
+{
+ struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
+ struct scrub_bio *sbio;
+
+ if (!wr_ctx->wr_curr_bio)
+ return;
+
+ sbio = wr_ctx->wr_curr_bio;
+ wr_ctx->wr_curr_bio = NULL;
+ WARN_ON(!sbio->bio->bi_bdev);
+ scrub_pending_bio_inc(sctx);
+ /* process all writes in a single worker thread. Then the block layer
+ * orders the requests before sending them to the driver which
+ * doubled the write performance on spinning disks when measured
+ * with Linux 3.5 */
+ btrfsic_submit_bio(WRITE, sbio->bio);
+}
+
+static void scrub_wr_bio_end_io(struct bio *bio, int err)
+{
+ struct scrub_bio *sbio = bio->bi_private;
+ struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
+
+ sbio->err = err;
+ sbio->bio = bio;
+
+ sbio->work.func = scrub_wr_bio_end_io_worker;
+ btrfs_queue_worker(&fs_info->scrub_wr_completion_workers, &sbio->work);
+}
+
+static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
+{
+ struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
+ struct scrub_ctx *sctx = sbio->sctx;
+ int i;
+
+ WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
+ if (sbio->err) {
+ struct btrfs_dev_replace *dev_replace =
+ &sbio->sctx->dev_root->fs_info->dev_replace;
+
+ for (i = 0; i < sbio->page_count; i++) {
+ struct scrub_page *spage = sbio->pagev[i];
+
+ spage->io_error = 1;
+ btrfs_dev_replace_stats_inc(&dev_replace->
+ num_write_errors);
+ }
+ }
+
+ for (i = 0; i < sbio->page_count; i++)
+ scrub_page_put(sbio->pagev[i]);
+
+ bio_put(sbio->bio);
+ kfree(sbio);
+ scrub_pending_bio_dec(sctx);
+}
+
+static int scrub_checksum(struct scrub_block *sblock)
{
u64 flags;
int ret;
- BUG_ON(sblock->page_count < 1);
- flags = sblock->pagev[0].flags;
+ WARN_ON(sblock->page_count < 1);
+ flags = sblock->pagev[0]->flags;
ret = 0;
if (flags & BTRFS_EXTENT_FLAG_DATA)
ret = scrub_checksum_data(sblock);
WARN_ON(1);
if (ret)
scrub_handle_errored_block(sblock);
+
+ return ret;
}
static int scrub_checksum_data(struct scrub_block *sblock)
{
- struct scrub_dev *sdev = sblock->sdev;
+ struct scrub_ctx *sctx = sblock->sctx;
u8 csum[BTRFS_CSUM_SIZE];
u8 *on_disk_csum;
struct page *page;
void *buffer;
u32 crc = ~(u32)0;
int fail = 0;
- struct btrfs_root *root = sdev->dev->dev_root;
+ struct btrfs_root *root = sctx->dev_root;
u64 len;
int index;
BUG_ON(sblock->page_count < 1);
- if (!sblock->pagev[0].have_csum)
+ if (!sblock->pagev[0]->have_csum)
return 0;
- on_disk_csum = sblock->pagev[0].csum;
- page = sblock->pagev[0].page;
+ on_disk_csum = sblock->pagev[0]->csum;
+ page = sblock->pagev[0]->page;
buffer = kmap_atomic(page);
- len = sdev->sectorsize;
+ len = sctx->sectorsize;
index = 0;
for (;;) {
u64 l = min_t(u64, len, PAGE_SIZE);
break;
index++;
BUG_ON(index >= sblock->page_count);
- BUG_ON(!sblock->pagev[index].page);
- page = sblock->pagev[index].page;
+ BUG_ON(!sblock->pagev[index]->page);
+ page = sblock->pagev[index]->page;
buffer = kmap_atomic(page);
}
btrfs_csum_final(crc, csum);
- if (memcmp(csum, on_disk_csum, sdev->csum_size))
+ if (memcmp(csum, on_disk_csum, sctx->csum_size))
fail = 1;
return fail;
static int scrub_checksum_tree_block(struct scrub_block *sblock)
{
- struct scrub_dev *sdev = sblock->sdev;
+ struct scrub_ctx *sctx = sblock->sctx;
struct btrfs_header *h;
- struct btrfs_root *root = sdev->dev->dev_root;
+ struct btrfs_root *root = sctx->dev_root;
struct btrfs_fs_info *fs_info = root->fs_info;
u8 calculated_csum[BTRFS_CSUM_SIZE];
u8 on_disk_csum[BTRFS_CSUM_SIZE];
int index;
BUG_ON(sblock->page_count < 1);
- page = sblock->pagev[0].page;
+ page = sblock->pagev[0]->page;
mapped_buffer = kmap_atomic(page);
h = (struct btrfs_header *)mapped_buffer;
- memcpy(on_disk_csum, h->csum, sdev->csum_size);
+ memcpy(on_disk_csum, h->csum, sctx->csum_size);
/*
* we don't use the getter functions here, as we
* b) the page is already kmapped
*/
- if (sblock->pagev[0].logical != le64_to_cpu(h->bytenr))
+ if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr))
++fail;
- if (sblock->pagev[0].generation != le64_to_cpu(h->generation))
+ if (sblock->pagev[0]->generation != le64_to_cpu(h->generation))
++fail;
if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
BTRFS_UUID_SIZE))
++fail;
- BUG_ON(sdev->nodesize != sdev->leafsize);
- len = sdev->nodesize - BTRFS_CSUM_SIZE;
+ WARN_ON(sctx->nodesize != sctx->leafsize);
+ len = sctx->nodesize - BTRFS_CSUM_SIZE;
mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
index = 0;
break;
index++;
BUG_ON(index >= sblock->page_count);
- BUG_ON(!sblock->pagev[index].page);
- page = sblock->pagev[index].page;
+ BUG_ON(!sblock->pagev[index]->page);
+ page = sblock->pagev[index]->page;
mapped_buffer = kmap_atomic(page);
mapped_size = PAGE_SIZE;
p = mapped_buffer;
}
btrfs_csum_final(crc, calculated_csum);
- if (memcmp(calculated_csum, on_disk_csum, sdev->csum_size))
+ if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
++crc_fail;
return fail || crc_fail;
static int scrub_checksum_super(struct scrub_block *sblock)
{
struct btrfs_super_block *s;
- struct scrub_dev *sdev = sblock->sdev;
- struct btrfs_root *root = sdev->dev->dev_root;
+ struct scrub_ctx *sctx = sblock->sctx;
+ struct btrfs_root *root = sctx->dev_root;
struct btrfs_fs_info *fs_info = root->fs_info;
u8 calculated_csum[BTRFS_CSUM_SIZE];
u8 on_disk_csum[BTRFS_CSUM_SIZE];
int index;
BUG_ON(sblock->page_count < 1);
- page = sblock->pagev[0].page;
+ page = sblock->pagev[0]->page;
mapped_buffer = kmap_atomic(page);
s = (struct btrfs_super_block *)mapped_buffer;
- memcpy(on_disk_csum, s->csum, sdev->csum_size);
+ memcpy(on_disk_csum, s->csum, sctx->csum_size);
- if (sblock->pagev[0].logical != le64_to_cpu(s->bytenr))
+ if (sblock->pagev[0]->logical != le64_to_cpu(s->bytenr))
++fail_cor;
- if (sblock->pagev[0].generation != le64_to_cpu(s->generation))
+ if (sblock->pagev[0]->generation != le64_to_cpu(s->generation))
++fail_gen;
if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
break;
index++;
BUG_ON(index >= sblock->page_count);
- BUG_ON(!sblock->pagev[index].page);
- page = sblock->pagev[index].page;
+ BUG_ON(!sblock->pagev[index]->page);
+ page = sblock->pagev[index]->page;
mapped_buffer = kmap_atomic(page);
mapped_size = PAGE_SIZE;
p = mapped_buffer;
}
btrfs_csum_final(crc, calculated_csum);
- if (memcmp(calculated_csum, on_disk_csum, sdev->csum_size))
+ if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
++fail_cor;
if (fail_cor + fail_gen) {
* They will get written with the next transaction commit
* anyway
*/
- spin_lock(&sdev->stat_lock);
- ++sdev->stat.super_errors;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ ++sctx->stat.super_errors;
+ spin_unlock(&sctx->stat_lock);
if (fail_cor)
- btrfs_dev_stat_inc_and_print(sdev->dev,
+ btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
BTRFS_DEV_STAT_CORRUPTION_ERRS);
else
- btrfs_dev_stat_inc_and_print(sdev->dev,
+ btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
BTRFS_DEV_STAT_GENERATION_ERRS);
}
int i;
for (i = 0; i < sblock->page_count; i++)
- if (sblock->pagev[i].page)
- __free_page(sblock->pagev[i].page);
+ scrub_page_put(sblock->pagev[i]);
kfree(sblock);
}
}
-static void scrub_submit(struct scrub_dev *sdev)
+static void scrub_page_get(struct scrub_page *spage)
+{
+ atomic_inc(&spage->ref_count);
+}
+
+static void scrub_page_put(struct scrub_page *spage)
+{
+ if (atomic_dec_and_test(&spage->ref_count)) {
+ if (spage->page)
+ __free_page(spage->page);
+ kfree(spage);
+ }
+}
+
+static void scrub_submit(struct scrub_ctx *sctx)
{
struct scrub_bio *sbio;
- if (sdev->curr == -1)
+ if (sctx->curr == -1)
return;
- sbio = sdev->bios[sdev->curr];
- sdev->curr = -1;
- atomic_inc(&sdev->in_flight);
+ sbio = sctx->bios[sctx->curr];
+ sctx->curr = -1;
+ scrub_pending_bio_inc(sctx);
- btrfsic_submit_bio(READ, sbio->bio);
+ if (!sbio->bio->bi_bdev) {
+ /*
+ * this case should not happen. If btrfs_map_block() is
+ * wrong, it could happen for dev-replace operations on
+ * missing devices when no mirrors are available, but in
+ * this case it should already fail the mount.
+ * This case is handled correctly (but _very_ slowly).
+ */
+ printk_ratelimited(KERN_WARNING
+ "btrfs: scrub_submit(bio bdev == NULL) is unexpected!\n");
+ bio_endio(sbio->bio, -EIO);
+ } else {
+ btrfsic_submit_bio(READ, sbio->bio);
+ }
}
-static int scrub_add_page_to_bio(struct scrub_dev *sdev,
- struct scrub_page *spage)
+static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
+ struct scrub_page *spage)
{
struct scrub_block *sblock = spage->sblock;
struct scrub_bio *sbio;
/*
* grab a fresh bio or wait for one to become available
*/
- while (sdev->curr == -1) {
- spin_lock(&sdev->list_lock);
- sdev->curr = sdev->first_free;
- if (sdev->curr != -1) {
- sdev->first_free = sdev->bios[sdev->curr]->next_free;
- sdev->bios[sdev->curr]->next_free = -1;
- sdev->bios[sdev->curr]->page_count = 0;
- spin_unlock(&sdev->list_lock);
+ while (sctx->curr == -1) {
+ spin_lock(&sctx->list_lock);
+ sctx->curr = sctx->first_free;
+ if (sctx->curr != -1) {
+ sctx->first_free = sctx->bios[sctx->curr]->next_free;
+ sctx->bios[sctx->curr]->next_free = -1;
+ sctx->bios[sctx->curr]->page_count = 0;
+ spin_unlock(&sctx->list_lock);
} else {
- spin_unlock(&sdev->list_lock);
- wait_event(sdev->list_wait, sdev->first_free != -1);
+ spin_unlock(&sctx->list_lock);
+ wait_event(sctx->list_wait, sctx->first_free != -1);
}
}
- sbio = sdev->bios[sdev->curr];
+ sbio = sctx->bios[sctx->curr];
if (sbio->page_count == 0) {
struct bio *bio;
sbio->physical = spage->physical;
sbio->logical = spage->logical;
+ sbio->dev = spage->dev;
bio = sbio->bio;
if (!bio) {
- bio = bio_alloc(GFP_NOFS, sdev->pages_per_bio);
+ bio = bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio);
if (!bio)
return -ENOMEM;
sbio->bio = bio;
bio->bi_private = sbio;
bio->bi_end_io = scrub_bio_end_io;
- bio->bi_bdev = sdev->dev->bdev;
- bio->bi_sector = spage->physical >> 9;
+ bio->bi_bdev = sbio->dev->bdev;
+ bio->bi_sector = sbio->physical >> 9;
sbio->err = 0;
} else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
spage->physical ||
sbio->logical + sbio->page_count * PAGE_SIZE !=
- spage->logical) {
- scrub_submit(sdev);
+ spage->logical ||
+ sbio->dev != spage->dev) {
+ scrub_submit(sctx);
goto again;
}
sbio->bio = NULL;
return -EIO;
}
- scrub_submit(sdev);
+ scrub_submit(sctx);
goto again;
}
- scrub_block_get(sblock); /* one for the added page */
+ scrub_block_get(sblock); /* one for the page added to the bio */
atomic_inc(&sblock->outstanding_pages);
sbio->page_count++;
- if (sbio->page_count == sdev->pages_per_bio)
- scrub_submit(sdev);
+ if (sbio->page_count == sctx->pages_per_rd_bio)
+ scrub_submit(sctx);
return 0;
}
-static int scrub_pages(struct scrub_dev *sdev, u64 logical, u64 len,
- u64 physical, u64 flags, u64 gen, int mirror_num,
- u8 *csum, int force)
+static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
+ u64 physical, struct btrfs_device *dev, u64 flags,
+ u64 gen, int mirror_num, u8 *csum, int force,
+ u64 physical_for_dev_replace)
{
struct scrub_block *sblock;
int index;
sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
if (!sblock) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.malloc_errors++;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ spin_unlock(&sctx->stat_lock);
return -ENOMEM;
}
- /* one ref inside this function, plus one for each page later on */
+ /* one ref inside this function, plus one for each page added to
+ * a bio later on */
atomic_set(&sblock->ref_count, 1);
- sblock->sdev = sdev;
+ sblock->sctx = sctx;
sblock->no_io_error_seen = 1;
for (index = 0; len > 0; index++) {
- struct scrub_page *spage = sblock->pagev + index;
+ struct scrub_page *spage;
u64 l = min_t(u64, len, PAGE_SIZE);
- BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
- spage->page = alloc_page(GFP_NOFS);
- if (!spage->page) {
- spin_lock(&sdev->stat_lock);
- sdev->stat.malloc_errors++;
- spin_unlock(&sdev->stat_lock);
- while (index > 0) {
- index--;
- __free_page(sblock->pagev[index].page);
- }
- kfree(sblock);
+ spage = kzalloc(sizeof(*spage), GFP_NOFS);
+ if (!spage) {
+leave_nomem:
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ spin_unlock(&sctx->stat_lock);
+ scrub_block_put(sblock);
return -ENOMEM;
}
+ BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
+ scrub_page_get(spage);
+ sblock->pagev[index] = spage;
spage->sblock = sblock;
- spage->dev = sdev->dev;
+ spage->dev = dev;
spage->flags = flags;
spage->generation = gen;
spage->logical = logical;
spage->physical = physical;
+ spage->physical_for_dev_replace = physical_for_dev_replace;
spage->mirror_num = mirror_num;
if (csum) {
spage->have_csum = 1;
- memcpy(spage->csum, csum, sdev->csum_size);
+ memcpy(spage->csum, csum, sctx->csum_size);
} else {
spage->have_csum = 0;
}
sblock->page_count++;
+ spage->page = alloc_page(GFP_NOFS);
+ if (!spage->page)
+ goto leave_nomem;
len -= l;
logical += l;
physical += l;
+ physical_for_dev_replace += l;
}
- BUG_ON(sblock->page_count == 0);
+ WARN_ON(sblock->page_count == 0);
for (index = 0; index < sblock->page_count; index++) {
- struct scrub_page *spage = sblock->pagev + index;
+ struct scrub_page *spage = sblock->pagev[index];
int ret;
- ret = scrub_add_page_to_bio(sdev, spage);
+ ret = scrub_add_page_to_rd_bio(sctx, spage);
if (ret) {
scrub_block_put(sblock);
return ret;
}
if (force)
- scrub_submit(sdev);
+ scrub_submit(sctx);
/* last one frees, either here or in bio completion for last page */
scrub_block_put(sblock);
static void scrub_bio_end_io(struct bio *bio, int err)
{
struct scrub_bio *sbio = bio->bi_private;
- struct scrub_dev *sdev = sbio->sdev;
- struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
+ struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
sbio->err = err;
sbio->bio = bio;
static void scrub_bio_end_io_worker(struct btrfs_work *work)
{
struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
- struct scrub_dev *sdev = sbio->sdev;
+ struct scrub_ctx *sctx = sbio->sctx;
int i;
- BUG_ON(sbio->page_count > SCRUB_PAGES_PER_BIO);
+ BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
if (sbio->err) {
for (i = 0; i < sbio->page_count; i++) {
struct scrub_page *spage = sbio->pagev[i];
bio_put(sbio->bio);
sbio->bio = NULL;
- spin_lock(&sdev->list_lock);
- sbio->next_free = sdev->first_free;
- sdev->first_free = sbio->index;
- spin_unlock(&sdev->list_lock);
- atomic_dec(&sdev->in_flight);
- wake_up(&sdev->list_wait);
+ spin_lock(&sctx->list_lock);
+ sbio->next_free = sctx->first_free;
+ sctx->first_free = sbio->index;
+ spin_unlock(&sctx->list_lock);
+
+ if (sctx->is_dev_replace &&
+ atomic_read(&sctx->wr_ctx.flush_all_writes)) {
+ mutex_lock(&sctx->wr_ctx.wr_lock);
+ scrub_wr_submit(sctx);
+ mutex_unlock(&sctx->wr_ctx.wr_lock);
+ }
+
+ scrub_pending_bio_dec(sctx);
}
static void scrub_block_complete(struct scrub_block *sblock)
{
- if (!sblock->no_io_error_seen)
+ if (!sblock->no_io_error_seen) {
scrub_handle_errored_block(sblock);
- else
- scrub_checksum(sblock);
+ } else {
+ /*
+ * if has checksum error, write via repair mechanism in
+ * dev replace case, otherwise write here in dev replace
+ * case.
+ */
+ if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace)
+ scrub_write_block_to_dev_replace(sblock);
+ }
}
-static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len,
+static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len,
u8 *csum)
{
struct btrfs_ordered_sum *sum = NULL;
unsigned long i;
unsigned long num_sectors;
- while (!list_empty(&sdev->csum_list)) {
- sum = list_first_entry(&sdev->csum_list,
+ while (!list_empty(&sctx->csum_list)) {
+ sum = list_first_entry(&sctx->csum_list,
struct btrfs_ordered_sum, list);
if (sum->bytenr > logical)
return 0;
if (sum->bytenr + sum->len > logical)
break;
- ++sdev->stat.csum_discards;
+ ++sctx->stat.csum_discards;
list_del(&sum->list);
kfree(sum);
sum = NULL;
if (!sum)
return 0;
- num_sectors = sum->len / sdev->sectorsize;
+ num_sectors = sum->len / sctx->sectorsize;
for (i = 0; i < num_sectors; ++i) {
if (sum->sums[i].bytenr == logical) {
- memcpy(csum, &sum->sums[i].sum, sdev->csum_size);
+ memcpy(csum, &sum->sums[i].sum, sctx->csum_size);
ret = 1;
break;
}
}
/* scrub extent tries to collect up to 64 kB for each bio */
-static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len,
- u64 physical, u64 flags, u64 gen, int mirror_num)
+static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len,
+ u64 physical, struct btrfs_device *dev, u64 flags,
+ u64 gen, int mirror_num, u64 physical_for_dev_replace)
{
int ret;
u8 csum[BTRFS_CSUM_SIZE];
u32 blocksize;
if (flags & BTRFS_EXTENT_FLAG_DATA) {
- blocksize = sdev->sectorsize;
- spin_lock(&sdev->stat_lock);
- sdev->stat.data_extents_scrubbed++;
- sdev->stat.data_bytes_scrubbed += len;
- spin_unlock(&sdev->stat_lock);
+ blocksize = sctx->sectorsize;
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.data_extents_scrubbed++;
+ sctx->stat.data_bytes_scrubbed += len;
+ spin_unlock(&sctx->stat_lock);
} else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
- BUG_ON(sdev->nodesize != sdev->leafsize);
- blocksize = sdev->nodesize;
- spin_lock(&sdev->stat_lock);
- sdev->stat.tree_extents_scrubbed++;
- sdev->stat.tree_bytes_scrubbed += len;
- spin_unlock(&sdev->stat_lock);
+ WARN_ON(sctx->nodesize != sctx->leafsize);
+ blocksize = sctx->nodesize;
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.tree_extents_scrubbed++;
+ sctx->stat.tree_bytes_scrubbed += len;
+ spin_unlock(&sctx->stat_lock);
} else {
- blocksize = sdev->sectorsize;
- BUG_ON(1);
+ blocksize = sctx->sectorsize;
+ WARN_ON(1);
}
while (len) {
if (flags & BTRFS_EXTENT_FLAG_DATA) {
/* push csums to sbio */
- have_csum = scrub_find_csum(sdev, logical, l, csum);
+ have_csum = scrub_find_csum(sctx, logical, l, csum);
if (have_csum == 0)
- ++sdev->stat.no_csum;
+ ++sctx->stat.no_csum;
+ if (sctx->is_dev_replace && !have_csum) {
+ ret = copy_nocow_pages(sctx, logical, l,
+ mirror_num,
+ physical_for_dev_replace);
+ goto behind_scrub_pages;
+ }
}
- ret = scrub_pages(sdev, logical, l, physical, flags, gen,
- mirror_num, have_csum ? csum : NULL, 0);
+ ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
+ mirror_num, have_csum ? csum : NULL, 0,
+ physical_for_dev_replace);
+behind_scrub_pages:
if (ret)
return ret;
len -= l;
logical += l;
physical += l;
+ physical_for_dev_replace += l;
}
return 0;
}
-static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev,
- struct map_lookup *map, int num, u64 base, u64 length)
+static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
+ struct map_lookup *map,
+ struct btrfs_device *scrub_dev,
+ int num, u64 base, u64 length,
+ int is_dev_replace)
{
struct btrfs_path *path;
- struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
+ struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *csum_root = fs_info->csum_root;
struct btrfs_extent_item *extent;
struct reada_control *reada2;
struct btrfs_key key_start;
struct btrfs_key key_end;
-
u64 increment = map->stripe_len;
u64 offset;
+ u64 extent_logical;
+ u64 extent_physical;
+ u64 extent_len;
+ struct btrfs_device *extent_dev;
+ int extent_mirror_num;
nstripes = length;
offset = 0;
*/
logical = base + offset;
- wait_event(sdev->list_wait,
- atomic_read(&sdev->in_flight) == 0);
+ wait_event(sctx->list_wait,
+ atomic_read(&sctx->bios_in_flight) == 0);
atomic_inc(&fs_info->scrubs_paused);
wake_up(&fs_info->scrub_pause_wait);
* canceled?
*/
if (atomic_read(&fs_info->scrub_cancel_req) ||
- atomic_read(&sdev->cancel_req)) {
+ atomic_read(&sctx->cancel_req)) {
ret = -ECANCELED;
goto out;
}
*/
if (atomic_read(&fs_info->scrub_pause_req)) {
/* push queued extents */
- scrub_submit(sdev);
- wait_event(sdev->list_wait,
- atomic_read(&sdev->in_flight) == 0);
+ atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
+ scrub_submit(sctx);
+ mutex_lock(&sctx->wr_ctx.wr_lock);
+ scrub_wr_submit(sctx);
+ mutex_unlock(&sctx->wr_ctx.wr_lock);
+ wait_event(sctx->list_wait,
+ atomic_read(&sctx->bios_in_flight) == 0);
+ atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
atomic_inc(&fs_info->scrubs_paused);
wake_up(&fs_info->scrub_pause_wait);
mutex_lock(&fs_info->scrub_lock);
ret = btrfs_lookup_csums_range(csum_root, logical,
logical + map->stripe_len - 1,
- &sdev->csum_list, 1);
+ &sctx->csum_list, 1);
if (ret)
goto out;
key.objectid;
}
- ret = scrub_extent(sdev, key.objectid, key.offset,
- key.objectid - logical + physical,
- flags, generation, mirror_num);
+ extent_logical = key.objectid;
+ extent_physical = key.objectid - logical + physical;
+ extent_len = key.offset;
+ extent_dev = scrub_dev;
+ extent_mirror_num = mirror_num;
+ if (is_dev_replace)
+ scrub_remap_extent(fs_info, extent_logical,
+ extent_len, &extent_physical,
+ &extent_dev,
+ &extent_mirror_num);
+ ret = scrub_extent(sctx, extent_logical, extent_len,
+ extent_physical, extent_dev, flags,
+ generation, extent_mirror_num,
+ key.objectid - logical + physical);
if (ret)
goto out;
btrfs_release_path(path);
logical += increment;
physical += map->stripe_len;
- spin_lock(&sdev->stat_lock);
- sdev->stat.last_physical = physical;
- spin_unlock(&sdev->stat_lock);
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.last_physical = physical;
+ spin_unlock(&sctx->stat_lock);
}
+out:
/* push queued extents */
- scrub_submit(sdev);
+ scrub_submit(sctx);
+ mutex_lock(&sctx->wr_ctx.wr_lock);
+ scrub_wr_submit(sctx);
+ mutex_unlock(&sctx->wr_ctx.wr_lock);
-out:
blk_finish_plug(&plug);
btrfs_free_path(path);
return ret < 0 ? ret : 0;
}
-static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev,
- u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length,
- u64 dev_offset)
+static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
+ struct btrfs_device *scrub_dev,
+ u64 chunk_tree, u64 chunk_objectid,
+ u64 chunk_offset, u64 length,
+ u64 dev_offset, int is_dev_replace)
{
struct btrfs_mapping_tree *map_tree =
- &sdev->dev->dev_root->fs_info->mapping_tree;
+ &sctx->dev_root->fs_info->mapping_tree;
struct map_lookup *map;
struct extent_map *em;
int i;
- int ret = -EINVAL;
+ int ret = 0;
read_lock(&map_tree->map_tree.lock);
em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
goto out;
for (i = 0; i < map->num_stripes; ++i) {
- if (map->stripes[i].dev == sdev->dev &&
+ if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
map->stripes[i].physical == dev_offset) {
- ret = scrub_stripe(sdev, map, i, chunk_offset, length);
+ ret = scrub_stripe(sctx, map, scrub_dev, i,
+ chunk_offset, length,
+ is_dev_replace);
if (ret)
goto out;
}
}
static noinline_for_stack
-int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
+int scrub_enumerate_chunks(struct scrub_ctx *sctx,
+ struct btrfs_device *scrub_dev, u64 start, u64 end,
+ int is_dev_replace)
{
struct btrfs_dev_extent *dev_extent = NULL;
struct btrfs_path *path;
- struct btrfs_root *root = sdev->dev->dev_root;
+ struct btrfs_root *root = sctx->dev_root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 length;
u64 chunk_tree;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_block_group_cache *cache;
+ struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
path = btrfs_alloc_path();
if (!path)
path->search_commit_root = 1;
path->skip_locking = 1;
- key.objectid = sdev->dev->devid;
+ key.objectid = scrub_dev->devid;
key.offset = 0ull;
key.type = BTRFS_DEV_EXTENT_KEY;
-
while (1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
btrfs_item_key_to_cpu(l, &found_key, slot);
- if (found_key.objectid != sdev->dev->devid)
+ if (found_key.objectid != scrub_dev->devid)
break;
if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY)
ret = -ENOENT;
break;
}
- ret = scrub_chunk(sdev, chunk_tree, chunk_objectid,
- chunk_offset, length, found_key.offset);
+ dev_replace->cursor_right = found_key.offset + length;
+ dev_replace->cursor_left = found_key.offset;
+ dev_replace->item_needs_writeback = 1;
+ ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid,
+ chunk_offset, length, found_key.offset,
+ is_dev_replace);
+
+ /*
+ * flush, submit all pending read and write bios, afterwards
+ * wait for them.
+ * Note that in the dev replace case, a read request causes
+ * write requests that are submitted in the read completion
+ * worker. Therefore in the current situation, it is required
+ * that all write requests are flushed, so that all read and
+ * write requests are really completed when bios_in_flight
+ * changes to 0.
+ */
+ atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
+ scrub_submit(sctx);
+ mutex_lock(&sctx->wr_ctx.wr_lock);
+ scrub_wr_submit(sctx);
+ mutex_unlock(&sctx->wr_ctx.wr_lock);
+
+ wait_event(sctx->list_wait,
+ atomic_read(&sctx->bios_in_flight) == 0);
+ atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
+ atomic_inc(&fs_info->scrubs_paused);
+ wake_up(&fs_info->scrub_pause_wait);
+ wait_event(sctx->list_wait,
+ atomic_read(&sctx->workers_pending) == 0);
+
+ mutex_lock(&fs_info->scrub_lock);
+ while (atomic_read(&fs_info->scrub_pause_req)) {
+ mutex_unlock(&fs_info->scrub_lock);
+ wait_event(fs_info->scrub_pause_wait,
+ atomic_read(&fs_info->scrub_pause_req) == 0);
+ mutex_lock(&fs_info->scrub_lock);
+ }
+ atomic_dec(&fs_info->scrubs_paused);
+ mutex_unlock(&fs_info->scrub_lock);
+ wake_up(&fs_info->scrub_pause_wait);
+
+ dev_replace->cursor_left = dev_replace->cursor_right;
+ dev_replace->item_needs_writeback = 1;
btrfs_put_block_group(cache);
if (ret)
break;
+ if (is_dev_replace &&
+ atomic64_read(&dev_replace->num_write_errors) > 0) {
+ ret = -EIO;
+ break;
+ }
+ if (sctx->stat.malloc_errors > 0) {
+ ret = -ENOMEM;
+ break;
+ }
key.offset = found_key.offset + length;
btrfs_release_path(path);
return ret < 0 ? ret : 0;
}
-static noinline_for_stack int scrub_supers(struct scrub_dev *sdev)
+static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
+ struct btrfs_device *scrub_dev)
{
int i;
u64 bytenr;
u64 gen;
int ret;
- struct btrfs_device *device = sdev->dev;
- struct btrfs_root *root = device->dev_root;
+ struct btrfs_root *root = sctx->dev_root;
if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
return -EIO;
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
bytenr = btrfs_sb_offset(i);
- if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
+ if (bytenr + BTRFS_SUPER_INFO_SIZE > scrub_dev->total_bytes)
break;
- ret = scrub_pages(sdev, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
- BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1);
+ ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
+ scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
+ NULL, 1, bytenr);
if (ret)
return ret;
}
- wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0);
+ wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
return 0;
}
/*
* get a reference count on fs_info->scrub_workers. start worker if necessary
*/
-static noinline_for_stack int scrub_workers_get(struct btrfs_root *root)
+static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
+ int is_dev_replace)
{
- struct btrfs_fs_info *fs_info = root->fs_info;
int ret = 0;
mutex_lock(&fs_info->scrub_lock);
if (fs_info->scrub_workers_refcnt == 0) {
- btrfs_init_workers(&fs_info->scrub_workers, "scrub",
- fs_info->thread_pool_size, &fs_info->generic_worker);
+ if (is_dev_replace)
+ btrfs_init_workers(&fs_info->scrub_workers, "scrub", 1,
+ &fs_info->generic_worker);
+ else
+ btrfs_init_workers(&fs_info->scrub_workers, "scrub",
+ fs_info->thread_pool_size,
+ &fs_info->generic_worker);
fs_info->scrub_workers.idle_thresh = 4;
ret = btrfs_start_workers(&fs_info->scrub_workers);
if (ret)
goto out;
+ btrfs_init_workers(&fs_info->scrub_wr_completion_workers,
+ "scrubwrc",
+ fs_info->thread_pool_size,
+ &fs_info->generic_worker);
+ fs_info->scrub_wr_completion_workers.idle_thresh = 2;
+ ret = btrfs_start_workers(
+ &fs_info->scrub_wr_completion_workers);
+ if (ret)
+ goto out;
+ btrfs_init_workers(&fs_info->scrub_nocow_workers, "scrubnc", 1,
+ &fs_info->generic_worker);
+ ret = btrfs_start_workers(&fs_info->scrub_nocow_workers);
+ if (ret)
+ goto out;
}
++fs_info->scrub_workers_refcnt;
out:
return ret;
}
-static noinline_for_stack void scrub_workers_put(struct btrfs_root *root)
+static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)
{
- struct btrfs_fs_info *fs_info = root->fs_info;
-
mutex_lock(&fs_info->scrub_lock);
- if (--fs_info->scrub_workers_refcnt == 0)
+ if (--fs_info->scrub_workers_refcnt == 0) {
btrfs_stop_workers(&fs_info->scrub_workers);
+ btrfs_stop_workers(&fs_info->scrub_wr_completion_workers);
+ btrfs_stop_workers(&fs_info->scrub_nocow_workers);
+ }
WARN_ON(fs_info->scrub_workers_refcnt < 0);
mutex_unlock(&fs_info->scrub_lock);
}
-
-int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
- struct btrfs_scrub_progress *progress, int readonly)
+int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
+ u64 end, struct btrfs_scrub_progress *progress,
+ int readonly, int is_dev_replace)
{
- struct scrub_dev *sdev;
- struct btrfs_fs_info *fs_info = root->fs_info;
+ struct scrub_ctx *sctx;
int ret;
struct btrfs_device *dev;
- if (btrfs_fs_closing(root->fs_info))
+ if (btrfs_fs_closing(fs_info))
return -EINVAL;
/*
* check some assumptions
*/
- if (root->nodesize != root->leafsize) {
+ if (fs_info->chunk_root->nodesize != fs_info->chunk_root->leafsize) {
printk(KERN_ERR
"btrfs_scrub: size assumption nodesize == leafsize (%d == %d) fails\n",
- root->nodesize, root->leafsize);
+ fs_info->chunk_root->nodesize,
+ fs_info->chunk_root->leafsize);
return -EINVAL;
}
- if (root->nodesize > BTRFS_STRIPE_LEN) {
+ if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) {
/*
* in this case scrub is unable to calculate the checksum
* the way scrub is implemented. Do not handle this
*/
printk(KERN_ERR
"btrfs_scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails\n",
- root->nodesize, BTRFS_STRIPE_LEN);
+ fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN);
return -EINVAL;
}
- if (root->sectorsize != PAGE_SIZE) {
+ if (fs_info->chunk_root->sectorsize != PAGE_SIZE) {
/* not supported for data w/o checksums */
printk(KERN_ERR
"btrfs_scrub: size assumption sectorsize != PAGE_SIZE (%d != %lld) fails\n",
- root->sectorsize, (unsigned long long)PAGE_SIZE);
+ fs_info->chunk_root->sectorsize,
+ (unsigned long long)PAGE_SIZE);
return -EINVAL;
}
- ret = scrub_workers_get(root);
+ if (fs_info->chunk_root->nodesize >
+ PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
+ fs_info->chunk_root->sectorsize >
+ PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
+ /*
+ * would exhaust the array bounds of pagev member in
+ * struct scrub_block
+ */
+ pr_err("btrfs_scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails\n",
+ fs_info->chunk_root->nodesize,
+ SCRUB_MAX_PAGES_PER_BLOCK,
+ fs_info->chunk_root->sectorsize,
+ SCRUB_MAX_PAGES_PER_BLOCK);
+ return -EINVAL;
+ }
+
+ ret = scrub_workers_get(fs_info, is_dev_replace);
if (ret)
return ret;
- mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
- dev = btrfs_find_device(root, devid, NULL, NULL);
- if (!dev || dev->missing) {
- mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
- scrub_workers_put(root);
+ mutex_lock(&fs_info->fs_devices->device_list_mutex);
+ dev = btrfs_find_device(fs_info, devid, NULL, NULL);
+ if (!dev || (dev->missing && !is_dev_replace)) {
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ scrub_workers_put(fs_info);
return -ENODEV;
}
mutex_lock(&fs_info->scrub_lock);
- if (!dev->in_fs_metadata) {
+ if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
mutex_unlock(&fs_info->scrub_lock);
- mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
- scrub_workers_put(root);
- return -ENODEV;
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ scrub_workers_put(fs_info);
+ return -EIO;
}
- if (dev->scrub_device) {
+ btrfs_dev_replace_lock(&fs_info->dev_replace);
+ if (dev->scrub_device ||
+ (!is_dev_replace &&
+ btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
+ btrfs_dev_replace_unlock(&fs_info->dev_replace);
mutex_unlock(&fs_info->scrub_lock);
- mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
- scrub_workers_put(root);
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ scrub_workers_put(fs_info);
return -EINPROGRESS;
}
- sdev = scrub_setup_dev(dev);
- if (IS_ERR(sdev)) {
+ btrfs_dev_replace_unlock(&fs_info->dev_replace);
+ sctx = scrub_setup_ctx(dev, is_dev_replace);
+ if (IS_ERR(sctx)) {
mutex_unlock(&fs_info->scrub_lock);
- mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
- scrub_workers_put(root);
- return PTR_ERR(sdev);
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ scrub_workers_put(fs_info);
+ return PTR_ERR(sctx);
}
- sdev->readonly = readonly;
- dev->scrub_device = sdev;
+ sctx->readonly = readonly;
+ dev->scrub_device = sctx;
atomic_inc(&fs_info->scrubs_running);
mutex_unlock(&fs_info->scrub_lock);
- mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
- down_read(&fs_info->scrub_super_lock);
- ret = scrub_supers(sdev);
- up_read(&fs_info->scrub_super_lock);
+ if (!is_dev_replace) {
+ down_read(&fs_info->scrub_super_lock);
+ ret = scrub_supers(sctx, dev);
+ up_read(&fs_info->scrub_super_lock);
+ }
if (!ret)
- ret = scrub_enumerate_chunks(sdev, start, end);
+ ret = scrub_enumerate_chunks(sctx, dev, start, end,
+ is_dev_replace);
- wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0);
+ wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
atomic_dec(&fs_info->scrubs_running);
wake_up(&fs_info->scrub_pause_wait);
- wait_event(sdev->list_wait, atomic_read(&sdev->fixup_cnt) == 0);
+ wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
if (progress)
- memcpy(progress, &sdev->stat, sizeof(*progress));
+ memcpy(progress, &sctx->stat, sizeof(*progress));
mutex_lock(&fs_info->scrub_lock);
dev->scrub_device = NULL;
mutex_unlock(&fs_info->scrub_lock);
- scrub_free_dev(sdev);
- scrub_workers_put(root);
+ scrub_free_ctx(sctx);
+ scrub_workers_put(fs_info);
return ret;
}
up_write(&root->fs_info->scrub_super_lock);
}
-int __btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
+int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
{
-
mutex_lock(&fs_info->scrub_lock);
if (!atomic_read(&fs_info->scrubs_running)) {
mutex_unlock(&fs_info->scrub_lock);
return 0;
}
-int btrfs_scrub_cancel(struct btrfs_root *root)
+int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info,
+ struct btrfs_device *dev)
{
- return __btrfs_scrub_cancel(root->fs_info);
-}
-
-int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev)
-{
- struct btrfs_fs_info *fs_info = root->fs_info;
- struct scrub_dev *sdev;
+ struct scrub_ctx *sctx;
mutex_lock(&fs_info->scrub_lock);
- sdev = dev->scrub_device;
- if (!sdev) {
+ sctx = dev->scrub_device;
+ if (!sctx) {
mutex_unlock(&fs_info->scrub_lock);
return -ENOTCONN;
}
- atomic_inc(&sdev->cancel_req);
+ atomic_inc(&sctx->cancel_req);
while (dev->scrub_device) {
mutex_unlock(&fs_info->scrub_lock);
wait_event(fs_info->scrub_pause_wait,
* does not go away in cancel_dev. FIXME: find a better solution
*/
mutex_lock(&fs_info->fs_devices->device_list_mutex);
- dev = btrfs_find_device(root, devid, NULL, NULL);
+ dev = btrfs_find_device(fs_info, devid, NULL, NULL);
if (!dev) {
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
return -ENODEV;
}
- ret = btrfs_scrub_cancel_dev(root, dev);
+ ret = btrfs_scrub_cancel_dev(fs_info, dev);
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
return ret;
struct btrfs_scrub_progress *progress)
{
struct btrfs_device *dev;
- struct scrub_dev *sdev = NULL;
+ struct scrub_ctx *sctx = NULL;
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
- dev = btrfs_find_device(root, devid, NULL, NULL);
+ dev = btrfs_find_device(root->fs_info, devid, NULL, NULL);
if (dev)
- sdev = dev->scrub_device;
- if (sdev)
- memcpy(progress, &sdev->stat, sizeof(*progress));
+ sctx = dev->scrub_device;
+ if (sctx)
+ memcpy(progress, &sctx->stat, sizeof(*progress));
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
- return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV;
+ return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
+}
+
+static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
+ u64 extent_logical, u64 extent_len,
+ u64 *extent_physical,
+ struct btrfs_device **extent_dev,
+ int *extent_mirror_num)
+{
+ u64 mapped_length;
+ struct btrfs_bio *bbio = NULL;
+ int ret;
+
+ mapped_length = extent_len;
+ ret = btrfs_map_block(fs_info, READ, extent_logical,
+ &mapped_length, &bbio, 0);
+ if (ret || !bbio || mapped_length < extent_len ||
+ !bbio->stripes[0].dev->bdev) {
+ kfree(bbio);
+ return;
+ }
+
+ *extent_physical = bbio->stripes[0].physical;
+ *extent_mirror_num = bbio->mirror_num;
+ *extent_dev = bbio->stripes[0].dev;
+ kfree(bbio);
+}
+
+static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
+ struct scrub_wr_ctx *wr_ctx,
+ struct btrfs_fs_info *fs_info,
+ struct btrfs_device *dev,
+ int is_dev_replace)
+{
+ WARN_ON(wr_ctx->wr_curr_bio != NULL);
+
+ mutex_init(&wr_ctx->wr_lock);
+ wr_ctx->wr_curr_bio = NULL;
+ if (!is_dev_replace)
+ return 0;
+
+ WARN_ON(!dev->bdev);
+ wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO,
+ bio_get_nr_vecs(dev->bdev));
+ wr_ctx->tgtdev = dev;
+ atomic_set(&wr_ctx->flush_all_writes, 0);
+ return 0;
+}
+
+static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
+{
+ mutex_lock(&wr_ctx->wr_lock);
+ kfree(wr_ctx->wr_curr_bio);
+ wr_ctx->wr_curr_bio = NULL;
+ mutex_unlock(&wr_ctx->wr_lock);
+}
+
+static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
+ int mirror_num, u64 physical_for_dev_replace)
+{
+ struct scrub_copy_nocow_ctx *nocow_ctx;
+ struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+
+ nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
+ if (!nocow_ctx) {
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ spin_unlock(&sctx->stat_lock);
+ return -ENOMEM;
+ }
+
+ scrub_pending_trans_workers_inc(sctx);
+
+ nocow_ctx->sctx = sctx;
+ nocow_ctx->logical = logical;
+ nocow_ctx->len = len;
+ nocow_ctx->mirror_num = mirror_num;
+ nocow_ctx->physical_for_dev_replace = physical_for_dev_replace;
+ nocow_ctx->work.func = copy_nocow_pages_worker;
+ btrfs_queue_worker(&fs_info->scrub_nocow_workers,
+ &nocow_ctx->work);
+
+ return 0;
+}
+
+static void copy_nocow_pages_worker(struct btrfs_work *work)
+{
+ struct scrub_copy_nocow_ctx *nocow_ctx =
+ container_of(work, struct scrub_copy_nocow_ctx, work);
+ struct scrub_ctx *sctx = nocow_ctx->sctx;
+ u64 logical = nocow_ctx->logical;
+ u64 len = nocow_ctx->len;
+ int mirror_num = nocow_ctx->mirror_num;
+ u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
+ int ret;
+ struct btrfs_trans_handle *trans = NULL;
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_path *path;
+ struct btrfs_root *root;
+ int not_written = 0;
+
+ fs_info = sctx->dev_root->fs_info;
+ root = fs_info->extent_root;
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ spin_unlock(&sctx->stat_lock);
+ not_written = 1;
+ goto out;
+ }
+
+ trans = btrfs_join_transaction(root);
+ if (IS_ERR(trans)) {
+ not_written = 1;
+ goto out;
+ }
+
+ ret = iterate_inodes_from_logical(logical, fs_info, path,
+ copy_nocow_pages_for_inode,
+ nocow_ctx);
+ if (ret != 0 && ret != -ENOENT) {
+ pr_warn("iterate_inodes_from_logical() failed: log %llu, phys %llu, len %llu, mir %llu, ret %d\n",
+ (unsigned long long)logical,
+ (unsigned long long)physical_for_dev_replace,
+ (unsigned long long)len,
+ (unsigned long long)mirror_num, ret);
+ not_written = 1;
+ goto out;
+ }
+
+out:
+ if (trans && !IS_ERR(trans))
+ btrfs_end_transaction(trans, root);
+ if (not_written)
+ btrfs_dev_replace_stats_inc(&fs_info->dev_replace.
+ num_uncorrectable_read_errors);
+
+ btrfs_free_path(path);
+ kfree(nocow_ctx);
+
+ scrub_pending_trans_workers_dec(sctx);
+}
+
+static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, void *ctx)
+{
+ unsigned long index;
+ struct scrub_copy_nocow_ctx *nocow_ctx = ctx;
+ int ret = 0;
+ struct btrfs_key key;
+ struct inode *inode = NULL;
+ struct btrfs_root *local_root;
+ u64 physical_for_dev_replace;
+ u64 len;
+ struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
+
+ key.objectid = root;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ local_root = btrfs_read_fs_root_no_name(fs_info, &key);
+ if (IS_ERR(local_root))
+ return PTR_ERR(local_root);
+
+ key.type = BTRFS_INODE_ITEM_KEY;
+ key.objectid = inum;
+ key.offset = 0;
+ inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
+ len = nocow_ctx->len;
+ while (len >= PAGE_CACHE_SIZE) {
+ struct page *page = NULL;
+ int ret_sub;
+
+ index = offset >> PAGE_CACHE_SHIFT;
+
+ page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
+ if (!page) {
+ pr_err("find_or_create_page() failed\n");
+ ret = -ENOMEM;
+ goto next_page;
+ }
+
+ if (PageUptodate(page)) {
+ if (PageDirty(page))
+ goto next_page;
+ } else {
+ ClearPageError(page);
+ ret_sub = extent_read_full_page(&BTRFS_I(inode)->
+ io_tree,
+ page, btrfs_get_extent,
+ nocow_ctx->mirror_num);
+ if (ret_sub) {
+ ret = ret_sub;
+ goto next_page;
+ }
+ wait_on_page_locked(page);
+ if (!PageUptodate(page)) {
+ ret = -EIO;
+ goto next_page;
+ }
+ }
+ ret_sub = write_page_nocow(nocow_ctx->sctx,
+ physical_for_dev_replace, page);
+ if (ret_sub) {
+ ret = ret_sub;
+ goto next_page;
+ }
+
+next_page:
+ if (page) {
+ unlock_page(page);
+ put_page(page);
+ }
+ offset += PAGE_CACHE_SIZE;
+ physical_for_dev_replace += PAGE_CACHE_SIZE;
+ len -= PAGE_CACHE_SIZE;
+ }
+
+ if (inode)
+ iput(inode);
+ return ret;
+}
+
+static int write_page_nocow(struct scrub_ctx *sctx,
+ u64 physical_for_dev_replace, struct page *page)
+{
+ struct bio *bio;
+ struct btrfs_device *dev;
+ int ret;
+ DECLARE_COMPLETION_ONSTACK(compl);
+
+ dev = sctx->wr_ctx.tgtdev;
+ if (!dev)
+ return -EIO;
+ if (!dev->bdev) {
+ printk_ratelimited(KERN_WARNING
+ "btrfs: scrub write_page_nocow(bdev == NULL) is unexpected!\n");
+ return -EIO;
+ }
+ bio = bio_alloc(GFP_NOFS, 1);
+ if (!bio) {
+ spin_lock(&sctx->stat_lock);
+ sctx->stat.malloc_errors++;
+ spin_unlock(&sctx->stat_lock);
+ return -ENOMEM;
+ }
+ bio->bi_private = &compl;
+ bio->bi_end_io = scrub_complete_bio_end_io;
+ bio->bi_size = 0;
+ bio->bi_sector = physical_for_dev_replace >> 9;
+ bio->bi_bdev = dev->bdev;
+ ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
+ if (ret != PAGE_CACHE_SIZE) {
+leave_with_eio:
+ bio_put(bio);
+ btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
+ return -EIO;
+ }
+ btrfsic_submit_bio(WRITE_SYNC, bio);
+ wait_for_completion(&compl);
+
+ if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+ goto leave_with_eio;
+
+ bio_put(bio);
+ return 0;
}
projects / karo-tx-linux.git / blobdiff