mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Ryusuke Konishi](/assets/img/avatar_default.png)
Replace most use of printk() in nilfs2 implementation with nilfs_msg(), and reduce the following checkpatch.pl warning: "WARNING: Prefer [subsystem eg: netdev]_crit([subsystem]dev, ... then dev_crit(dev, ... then pr_crit(... to printk(KERN_CRIT ..." This patch also fixes a minor checkpatch warning "WARNING: quoted string split across lines" that often accompanies the prior warning, and amends message format as needed. Link: http://lkml.kernel.org/r/1464875891-5443-5-git-send-email-konishi.ryusuke@lab.ntt.co.jp Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
963 lines
24 KiB
C
963 lines
24 KiB
C
/*
|
|
* recovery.c - NILFS recovery logic
|
|
*
|
|
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Written by Ryusuke Konishi.
|
|
*/
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/crc32.h>
|
|
#include "nilfs.h"
|
|
#include "segment.h"
|
|
#include "sufile.h"
|
|
#include "page.h"
|
|
#include "segbuf.h"
|
|
|
|
/*
|
|
* Segment check result
|
|
*/
|
|
enum {
|
|
NILFS_SEG_VALID,
|
|
NILFS_SEG_NO_SUPER_ROOT,
|
|
NILFS_SEG_FAIL_IO,
|
|
NILFS_SEG_FAIL_MAGIC,
|
|
NILFS_SEG_FAIL_SEQ,
|
|
NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT,
|
|
NILFS_SEG_FAIL_CHECKSUM_FULL,
|
|
NILFS_SEG_FAIL_CONSISTENCY,
|
|
};
|
|
|
|
/* work structure for recovery */
|
|
struct nilfs_recovery_block {
|
|
ino_t ino; /*
|
|
* Inode number of the file that this block
|
|
* belongs to
|
|
*/
|
|
sector_t blocknr; /* block number */
|
|
__u64 vblocknr; /* virtual block number */
|
|
unsigned long blkoff; /* File offset of the data block (per block) */
|
|
struct list_head list;
|
|
};
|
|
|
|
|
|
static int nilfs_warn_segment_error(struct super_block *sb, int err)
|
|
{
|
|
const char *msg = NULL;
|
|
|
|
switch (err) {
|
|
case NILFS_SEG_FAIL_IO:
|
|
nilfs_msg(sb, KERN_ERR, "I/O error reading segment");
|
|
return -EIO;
|
|
case NILFS_SEG_FAIL_MAGIC:
|
|
msg = "Magic number mismatch";
|
|
break;
|
|
case NILFS_SEG_FAIL_SEQ:
|
|
msg = "Sequence number mismatch";
|
|
break;
|
|
case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT:
|
|
msg = "Checksum error in super root";
|
|
break;
|
|
case NILFS_SEG_FAIL_CHECKSUM_FULL:
|
|
msg = "Checksum error in segment payload";
|
|
break;
|
|
case NILFS_SEG_FAIL_CONSISTENCY:
|
|
msg = "Inconsistency found";
|
|
break;
|
|
case NILFS_SEG_NO_SUPER_ROOT:
|
|
msg = "No super root in the last segment";
|
|
break;
|
|
default:
|
|
nilfs_msg(sb, KERN_ERR, "unrecognized segment error %d", err);
|
|
return -EINVAL;
|
|
}
|
|
nilfs_msg(sb, KERN_WARNING, "invalid segment: %s", msg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* nilfs_compute_checksum - compute checksum of blocks continuously
|
|
* @nilfs: nilfs object
|
|
* @bhs: buffer head of start block
|
|
* @sum: place to store result
|
|
* @offset: offset bytes in the first block
|
|
* @check_bytes: number of bytes to be checked
|
|
* @start: DBN of start block
|
|
* @nblock: number of blocks to be checked
|
|
*/
|
|
static int nilfs_compute_checksum(struct the_nilfs *nilfs,
|
|
struct buffer_head *bhs, u32 *sum,
|
|
unsigned long offset, u64 check_bytes,
|
|
sector_t start, unsigned long nblock)
|
|
{
|
|
unsigned int blocksize = nilfs->ns_blocksize;
|
|
unsigned long size;
|
|
u32 crc;
|
|
|
|
BUG_ON(offset >= blocksize);
|
|
check_bytes -= offset;
|
|
size = min_t(u64, check_bytes, blocksize - offset);
|
|
crc = crc32_le(nilfs->ns_crc_seed,
|
|
(unsigned char *)bhs->b_data + offset, size);
|
|
if (--nblock > 0) {
|
|
do {
|
|
struct buffer_head *bh;
|
|
|
|
bh = __bread(nilfs->ns_bdev, ++start, blocksize);
|
|
if (!bh)
|
|
return -EIO;
|
|
check_bytes -= size;
|
|
size = min_t(u64, check_bytes, blocksize);
|
|
crc = crc32_le(crc, bh->b_data, size);
|
|
brelse(bh);
|
|
} while (--nblock > 0);
|
|
}
|
|
*sum = crc;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nilfs_read_super_root_block - read super root block
|
|
* @nilfs: nilfs object
|
|
* @sr_block: disk block number of the super root block
|
|
* @pbh: address of a buffer_head pointer to return super root buffer
|
|
* @check: CRC check flag
|
|
*/
|
|
int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
|
|
struct buffer_head **pbh, int check)
|
|
{
|
|
struct buffer_head *bh_sr;
|
|
struct nilfs_super_root *sr;
|
|
u32 crc;
|
|
int ret;
|
|
|
|
*pbh = NULL;
|
|
bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize);
|
|
if (unlikely(!bh_sr)) {
|
|
ret = NILFS_SEG_FAIL_IO;
|
|
goto failed;
|
|
}
|
|
|
|
sr = (struct nilfs_super_root *)bh_sr->b_data;
|
|
if (check) {
|
|
unsigned int bytes = le16_to_cpu(sr->sr_bytes);
|
|
|
|
if (bytes == 0 || bytes > nilfs->ns_blocksize) {
|
|
ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
|
|
goto failed_bh;
|
|
}
|
|
if (nilfs_compute_checksum(
|
|
nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes,
|
|
sr_block, 1)) {
|
|
ret = NILFS_SEG_FAIL_IO;
|
|
goto failed_bh;
|
|
}
|
|
if (crc != le32_to_cpu(sr->sr_sum)) {
|
|
ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
|
|
goto failed_bh;
|
|
}
|
|
}
|
|
*pbh = bh_sr;
|
|
return 0;
|
|
|
|
failed_bh:
|
|
brelse(bh_sr);
|
|
|
|
failed:
|
|
return nilfs_warn_segment_error(nilfs->ns_sb, ret);
|
|
}
|
|
|
|
/**
|
|
* nilfs_read_log_header - read summary header of the specified log
|
|
* @nilfs: nilfs object
|
|
* @start_blocknr: start block number of the log
|
|
* @sum: pointer to return segment summary structure
|
|
*/
|
|
static struct buffer_head *
|
|
nilfs_read_log_header(struct the_nilfs *nilfs, sector_t start_blocknr,
|
|
struct nilfs_segment_summary **sum)
|
|
{
|
|
struct buffer_head *bh_sum;
|
|
|
|
bh_sum = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
|
|
if (bh_sum)
|
|
*sum = (struct nilfs_segment_summary *)bh_sum->b_data;
|
|
return bh_sum;
|
|
}
|
|
|
|
/**
|
|
* nilfs_validate_log - verify consistency of log
|
|
* @nilfs: nilfs object
|
|
* @seg_seq: sequence number of segment
|
|
* @bh_sum: buffer head of summary block
|
|
* @sum: segment summary struct
|
|
*/
|
|
static int nilfs_validate_log(struct the_nilfs *nilfs, u64 seg_seq,
|
|
struct buffer_head *bh_sum,
|
|
struct nilfs_segment_summary *sum)
|
|
{
|
|
unsigned long nblock;
|
|
u32 crc;
|
|
int ret;
|
|
|
|
ret = NILFS_SEG_FAIL_MAGIC;
|
|
if (le32_to_cpu(sum->ss_magic) != NILFS_SEGSUM_MAGIC)
|
|
goto out;
|
|
|
|
ret = NILFS_SEG_FAIL_SEQ;
|
|
if (le64_to_cpu(sum->ss_seq) != seg_seq)
|
|
goto out;
|
|
|
|
nblock = le32_to_cpu(sum->ss_nblocks);
|
|
ret = NILFS_SEG_FAIL_CONSISTENCY;
|
|
if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment))
|
|
/* This limits the number of blocks read in the CRC check */
|
|
goto out;
|
|
|
|
ret = NILFS_SEG_FAIL_IO;
|
|
if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum),
|
|
((u64)nblock << nilfs->ns_blocksize_bits),
|
|
bh_sum->b_blocknr, nblock))
|
|
goto out;
|
|
|
|
ret = NILFS_SEG_FAIL_CHECKSUM_FULL;
|
|
if (crc != le32_to_cpu(sum->ss_datasum))
|
|
goto out;
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_read_summary_info - read an item on summary blocks of a log
|
|
* @nilfs: nilfs object
|
|
* @pbh: the current buffer head on summary blocks [in, out]
|
|
* @offset: the current byte offset on summary blocks [in, out]
|
|
* @bytes: byte size of the item to be read
|
|
*/
|
|
static void *nilfs_read_summary_info(struct the_nilfs *nilfs,
|
|
struct buffer_head **pbh,
|
|
unsigned int *offset, unsigned int bytes)
|
|
{
|
|
void *ptr;
|
|
sector_t blocknr;
|
|
|
|
BUG_ON((*pbh)->b_size < *offset);
|
|
if (bytes > (*pbh)->b_size - *offset) {
|
|
blocknr = (*pbh)->b_blocknr;
|
|
brelse(*pbh);
|
|
*pbh = __bread(nilfs->ns_bdev, blocknr + 1,
|
|
nilfs->ns_blocksize);
|
|
if (unlikely(!*pbh))
|
|
return NULL;
|
|
*offset = 0;
|
|
}
|
|
ptr = (*pbh)->b_data + *offset;
|
|
*offset += bytes;
|
|
return ptr;
|
|
}
|
|
|
|
/**
|
|
* nilfs_skip_summary_info - skip items on summary blocks of a log
|
|
* @nilfs: nilfs object
|
|
* @pbh: the current buffer head on summary blocks [in, out]
|
|
* @offset: the current byte offset on summary blocks [in, out]
|
|
* @bytes: byte size of the item to be skipped
|
|
* @count: number of items to be skipped
|
|
*/
|
|
static void nilfs_skip_summary_info(struct the_nilfs *nilfs,
|
|
struct buffer_head **pbh,
|
|
unsigned int *offset, unsigned int bytes,
|
|
unsigned long count)
|
|
{
|
|
unsigned int rest_item_in_current_block
|
|
= ((*pbh)->b_size - *offset) / bytes;
|
|
|
|
if (count <= rest_item_in_current_block) {
|
|
*offset += bytes * count;
|
|
} else {
|
|
sector_t blocknr = (*pbh)->b_blocknr;
|
|
unsigned int nitem_per_block = (*pbh)->b_size / bytes;
|
|
unsigned int bcnt;
|
|
|
|
count -= rest_item_in_current_block;
|
|
bcnt = DIV_ROUND_UP(count, nitem_per_block);
|
|
*offset = bytes * (count - (bcnt - 1) * nitem_per_block);
|
|
|
|
brelse(*pbh);
|
|
*pbh = __bread(nilfs->ns_bdev, blocknr + bcnt,
|
|
nilfs->ns_blocksize);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nilfs_scan_dsync_log - get block information of a log written for data sync
|
|
* @nilfs: nilfs object
|
|
* @start_blocknr: start block number of the log
|
|
* @sum: log summary information
|
|
* @head: list head to add nilfs_recovery_block struct
|
|
*/
|
|
static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr,
|
|
struct nilfs_segment_summary *sum,
|
|
struct list_head *head)
|
|
{
|
|
struct buffer_head *bh;
|
|
unsigned int offset;
|
|
u32 nfinfo, sumbytes;
|
|
sector_t blocknr;
|
|
ino_t ino;
|
|
int err = -EIO;
|
|
|
|
nfinfo = le32_to_cpu(sum->ss_nfinfo);
|
|
if (!nfinfo)
|
|
return 0;
|
|
|
|
sumbytes = le32_to_cpu(sum->ss_sumbytes);
|
|
blocknr = start_blocknr + DIV_ROUND_UP(sumbytes, nilfs->ns_blocksize);
|
|
bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
|
|
if (unlikely(!bh))
|
|
goto out;
|
|
|
|
offset = le16_to_cpu(sum->ss_bytes);
|
|
for (;;) {
|
|
unsigned long nblocks, ndatablk, nnodeblk;
|
|
struct nilfs_finfo *finfo;
|
|
|
|
finfo = nilfs_read_summary_info(nilfs, &bh, &offset,
|
|
sizeof(*finfo));
|
|
if (unlikely(!finfo))
|
|
goto out;
|
|
|
|
ino = le64_to_cpu(finfo->fi_ino);
|
|
nblocks = le32_to_cpu(finfo->fi_nblocks);
|
|
ndatablk = le32_to_cpu(finfo->fi_ndatablk);
|
|
nnodeblk = nblocks - ndatablk;
|
|
|
|
while (ndatablk-- > 0) {
|
|
struct nilfs_recovery_block *rb;
|
|
struct nilfs_binfo_v *binfo;
|
|
|
|
binfo = nilfs_read_summary_info(nilfs, &bh, &offset,
|
|
sizeof(*binfo));
|
|
if (unlikely(!binfo))
|
|
goto out;
|
|
|
|
rb = kmalloc(sizeof(*rb), GFP_NOFS);
|
|
if (unlikely(!rb)) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
rb->ino = ino;
|
|
rb->blocknr = blocknr++;
|
|
rb->vblocknr = le64_to_cpu(binfo->bi_vblocknr);
|
|
rb->blkoff = le64_to_cpu(binfo->bi_blkoff);
|
|
/* INIT_LIST_HEAD(&rb->list); */
|
|
list_add_tail(&rb->list, head);
|
|
}
|
|
if (--nfinfo == 0)
|
|
break;
|
|
blocknr += nnodeblk; /* always 0 for data sync logs */
|
|
nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64),
|
|
nnodeblk);
|
|
if (unlikely(!bh))
|
|
goto out;
|
|
}
|
|
err = 0;
|
|
out:
|
|
brelse(bh); /* brelse(NULL) is just ignored */
|
|
return err;
|
|
}
|
|
|
|
static void dispose_recovery_list(struct list_head *head)
|
|
{
|
|
while (!list_empty(head)) {
|
|
struct nilfs_recovery_block *rb;
|
|
|
|
rb = list_first_entry(head, struct nilfs_recovery_block, list);
|
|
list_del(&rb->list);
|
|
kfree(rb);
|
|
}
|
|
}
|
|
|
|
struct nilfs_segment_entry {
|
|
struct list_head list;
|
|
__u64 segnum;
|
|
};
|
|
|
|
static int nilfs_segment_list_add(struct list_head *head, __u64 segnum)
|
|
{
|
|
struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS);
|
|
|
|
if (unlikely(!ent))
|
|
return -ENOMEM;
|
|
|
|
ent->segnum = segnum;
|
|
INIT_LIST_HEAD(&ent->list);
|
|
list_add_tail(&ent->list, head);
|
|
return 0;
|
|
}
|
|
|
|
void nilfs_dispose_segment_list(struct list_head *head)
|
|
{
|
|
while (!list_empty(head)) {
|
|
struct nilfs_segment_entry *ent;
|
|
|
|
ent = list_first_entry(head, struct nilfs_segment_entry, list);
|
|
list_del(&ent->list);
|
|
kfree(ent);
|
|
}
|
|
}
|
|
|
|
static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
|
|
struct super_block *sb,
|
|
struct nilfs_recovery_info *ri)
|
|
{
|
|
struct list_head *head = &ri->ri_used_segments;
|
|
struct nilfs_segment_entry *ent, *n;
|
|
struct inode *sufile = nilfs->ns_sufile;
|
|
__u64 segnum[4];
|
|
int err;
|
|
int i;
|
|
|
|
segnum[0] = nilfs->ns_segnum;
|
|
segnum[1] = nilfs->ns_nextnum;
|
|
segnum[2] = ri->ri_segnum;
|
|
segnum[3] = ri->ri_nextnum;
|
|
|
|
/*
|
|
* Releasing the next segment of the latest super root.
|
|
* The next segment is invalidated by this recovery.
|
|
*/
|
|
err = nilfs_sufile_free(sufile, segnum[1]);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
for (i = 1; i < 4; i++) {
|
|
err = nilfs_segment_list_add(head, segnum[i]);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
}
|
|
|
|
/*
|
|
* Collecting segments written after the latest super root.
|
|
* These are marked dirty to avoid being reallocated in the next write.
|
|
*/
|
|
list_for_each_entry_safe(ent, n, head, list) {
|
|
if (ent->segnum != segnum[0]) {
|
|
err = nilfs_sufile_scrap(sufile, ent->segnum);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
}
|
|
list_del(&ent->list);
|
|
kfree(ent);
|
|
}
|
|
|
|
/* Allocate new segments for recovery */
|
|
err = nilfs_sufile_alloc(sufile, &segnum[0]);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
nilfs->ns_pseg_offset = 0;
|
|
nilfs->ns_seg_seq = ri->ri_seq + 2;
|
|
nilfs->ns_nextnum = nilfs->ns_segnum = segnum[0];
|
|
|
|
failed:
|
|
/* No need to recover sufile because it will be destroyed on error */
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,
|
|
struct nilfs_recovery_block *rb,
|
|
struct page *page)
|
|
{
|
|
struct buffer_head *bh_org;
|
|
void *kaddr;
|
|
|
|
bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize);
|
|
if (unlikely(!bh_org))
|
|
return -EIO;
|
|
|
|
kaddr = kmap_atomic(page);
|
|
memcpy(kaddr + bh_offset(bh_org), bh_org->b_data, bh_org->b_size);
|
|
kunmap_atomic(kaddr);
|
|
brelse(bh_org);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
|
|
struct super_block *sb,
|
|
struct nilfs_root *root,
|
|
struct list_head *head,
|
|
unsigned long *nr_salvaged_blocks)
|
|
{
|
|
struct inode *inode;
|
|
struct nilfs_recovery_block *rb, *n;
|
|
unsigned int blocksize = nilfs->ns_blocksize;
|
|
struct page *page;
|
|
loff_t pos;
|
|
int err = 0, err2 = 0;
|
|
|
|
list_for_each_entry_safe(rb, n, head, list) {
|
|
inode = nilfs_iget(sb, root, rb->ino);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
inode = NULL;
|
|
goto failed_inode;
|
|
}
|
|
|
|
pos = rb->blkoff << inode->i_blkbits;
|
|
err = block_write_begin(inode->i_mapping, pos, blocksize,
|
|
0, &page, nilfs_get_block);
|
|
if (unlikely(err)) {
|
|
loff_t isize = inode->i_size;
|
|
|
|
if (pos + blocksize > isize)
|
|
nilfs_write_failed(inode->i_mapping,
|
|
pos + blocksize);
|
|
goto failed_inode;
|
|
}
|
|
|
|
err = nilfs_recovery_copy_block(nilfs, rb, page);
|
|
if (unlikely(err))
|
|
goto failed_page;
|
|
|
|
err = nilfs_set_file_dirty(inode, 1);
|
|
if (unlikely(err))
|
|
goto failed_page;
|
|
|
|
block_write_end(NULL, inode->i_mapping, pos, blocksize,
|
|
blocksize, page, NULL);
|
|
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
(*nr_salvaged_blocks)++;
|
|
goto next;
|
|
|
|
failed_page:
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
failed_inode:
|
|
nilfs_msg(sb, KERN_WARNING,
|
|
"error %d recovering data block (ino=%lu, block-offset=%llu)",
|
|
err, (unsigned long)rb->ino,
|
|
(unsigned long long)rb->blkoff);
|
|
if (!err2)
|
|
err2 = err;
|
|
next:
|
|
iput(inode); /* iput(NULL) is just ignored */
|
|
list_del_init(&rb->list);
|
|
kfree(rb);
|
|
}
|
|
return err2;
|
|
}
|
|
|
|
/**
|
|
* nilfs_do_roll_forward - salvage logical segments newer than the latest
|
|
* checkpoint
|
|
* @nilfs: nilfs object
|
|
* @sb: super block instance
|
|
* @ri: pointer to a nilfs_recovery_info
|
|
*/
|
|
static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
|
|
struct super_block *sb,
|
|
struct nilfs_root *root,
|
|
struct nilfs_recovery_info *ri)
|
|
{
|
|
struct buffer_head *bh_sum = NULL;
|
|
struct nilfs_segment_summary *sum = NULL;
|
|
sector_t pseg_start;
|
|
sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */
|
|
unsigned long nsalvaged_blocks = 0;
|
|
unsigned int flags;
|
|
u64 seg_seq;
|
|
__u64 segnum, nextnum = 0;
|
|
int empty_seg = 0;
|
|
int err = 0, ret;
|
|
LIST_HEAD(dsync_blocks); /* list of data blocks to be recovered */
|
|
enum {
|
|
RF_INIT_ST,
|
|
RF_DSYNC_ST, /* scanning data-sync segments */
|
|
};
|
|
int state = RF_INIT_ST;
|
|
|
|
pseg_start = ri->ri_lsegs_start;
|
|
seg_seq = ri->ri_lsegs_start_seq;
|
|
segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
|
|
nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
|
|
|
|
while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {
|
|
brelse(bh_sum);
|
|
bh_sum = nilfs_read_log_header(nilfs, pseg_start, &sum);
|
|
if (!bh_sum) {
|
|
err = -EIO;
|
|
goto failed;
|
|
}
|
|
|
|
ret = nilfs_validate_log(nilfs, seg_seq, bh_sum, sum);
|
|
if (ret) {
|
|
if (ret == NILFS_SEG_FAIL_IO) {
|
|
err = -EIO;
|
|
goto failed;
|
|
}
|
|
goto strayed;
|
|
}
|
|
|
|
flags = le16_to_cpu(sum->ss_flags);
|
|
if (flags & NILFS_SS_SR)
|
|
goto confused;
|
|
|
|
/* Found a valid partial segment; do recovery actions */
|
|
nextnum = nilfs_get_segnum_of_block(nilfs,
|
|
le64_to_cpu(sum->ss_next));
|
|
empty_seg = 0;
|
|
nilfs->ns_ctime = le64_to_cpu(sum->ss_create);
|
|
if (!(flags & NILFS_SS_GC))
|
|
nilfs->ns_nongc_ctime = nilfs->ns_ctime;
|
|
|
|
switch (state) {
|
|
case RF_INIT_ST:
|
|
if (!(flags & NILFS_SS_LOGBGN) ||
|
|
!(flags & NILFS_SS_SYNDT))
|
|
goto try_next_pseg;
|
|
state = RF_DSYNC_ST;
|
|
/* Fall through */
|
|
case RF_DSYNC_ST:
|
|
if (!(flags & NILFS_SS_SYNDT))
|
|
goto confused;
|
|
|
|
err = nilfs_scan_dsync_log(nilfs, pseg_start, sum,
|
|
&dsync_blocks);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
if (flags & NILFS_SS_LOGEND) {
|
|
err = nilfs_recover_dsync_blocks(
|
|
nilfs, sb, root, &dsync_blocks,
|
|
&nsalvaged_blocks);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
state = RF_INIT_ST;
|
|
}
|
|
break; /* Fall through to try_next_pseg */
|
|
}
|
|
|
|
try_next_pseg:
|
|
if (pseg_start == ri->ri_lsegs_end)
|
|
break;
|
|
pseg_start += le32_to_cpu(sum->ss_nblocks);
|
|
if (pseg_start < seg_end)
|
|
continue;
|
|
goto feed_segment;
|
|
|
|
strayed:
|
|
if (pseg_start == ri->ri_lsegs_end)
|
|
break;
|
|
|
|
feed_segment:
|
|
/* Looking to the next full segment */
|
|
if (empty_seg++)
|
|
break;
|
|
seg_seq++;
|
|
segnum = nextnum;
|
|
nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
|
|
pseg_start = seg_start;
|
|
}
|
|
|
|
if (nsalvaged_blocks) {
|
|
nilfs_msg(sb, KERN_INFO, "salvaged %lu blocks",
|
|
nsalvaged_blocks);
|
|
ri->ri_need_recovery = NILFS_RECOVERY_ROLLFORWARD_DONE;
|
|
}
|
|
out:
|
|
brelse(bh_sum);
|
|
dispose_recovery_list(&dsync_blocks);
|
|
return err;
|
|
|
|
confused:
|
|
err = -EINVAL;
|
|
failed:
|
|
nilfs_msg(sb, KERN_ERR,
|
|
"error %d roll-forwarding partial segment at blocknr = %llu",
|
|
err, (unsigned long long)pseg_start);
|
|
goto out;
|
|
}
|
|
|
|
static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
|
|
struct nilfs_recovery_info *ri)
|
|
{
|
|
struct buffer_head *bh;
|
|
int err;
|
|
|
|
if (nilfs_get_segnum_of_block(nilfs, ri->ri_lsegs_start) !=
|
|
nilfs_get_segnum_of_block(nilfs, ri->ri_super_root))
|
|
return;
|
|
|
|
bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize);
|
|
BUG_ON(!bh);
|
|
memset(bh->b_data, 0, bh->b_size);
|
|
set_buffer_dirty(bh);
|
|
err = sync_dirty_buffer(bh);
|
|
if (unlikely(err))
|
|
nilfs_msg(nilfs->ns_sb, KERN_WARNING,
|
|
"buffer sync write failed during post-cleaning of recovery.");
|
|
brelse(bh);
|
|
}
|
|
|
|
/**
|
|
* nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint
|
|
* @nilfs: nilfs object
|
|
* @sb: super block instance
|
|
* @ri: pointer to a nilfs_recovery_info struct to store search results.
|
|
*
|
|
* Return Value: On success, 0 is returned. On error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EINVAL - Inconsistent filesystem state.
|
|
*
|
|
* %-EIO - I/O error
|
|
*
|
|
* %-ENOSPC - No space left on device (only in a panic state).
|
|
*
|
|
* %-ERESTARTSYS - Interrupted.
|
|
*
|
|
* %-ENOMEM - Insufficient memory available.
|
|
*/
|
|
int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
|
|
struct super_block *sb,
|
|
struct nilfs_recovery_info *ri)
|
|
{
|
|
struct nilfs_root *root;
|
|
int err;
|
|
|
|
if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0)
|
|
return 0;
|
|
|
|
err = nilfs_attach_checkpoint(sb, ri->ri_cno, true, &root);
|
|
if (unlikely(err)) {
|
|
nilfs_msg(sb, KERN_ERR,
|
|
"error %d loading the latest checkpoint", err);
|
|
return err;
|
|
}
|
|
|
|
err = nilfs_do_roll_forward(nilfs, sb, root, ri);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
if (ri->ri_need_recovery == NILFS_RECOVERY_ROLLFORWARD_DONE) {
|
|
err = nilfs_prepare_segment_for_recovery(nilfs, sb, ri);
|
|
if (unlikely(err)) {
|
|
nilfs_msg(sb, KERN_ERR,
|
|
"error %d preparing segment for recovery",
|
|
err);
|
|
goto failed;
|
|
}
|
|
|
|
err = nilfs_attach_log_writer(sb, root);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
set_nilfs_discontinued(nilfs);
|
|
err = nilfs_construct_segment(sb);
|
|
nilfs_detach_log_writer(sb);
|
|
|
|
if (unlikely(err)) {
|
|
nilfs_msg(sb, KERN_ERR,
|
|
"error %d writing segment for recovery",
|
|
err);
|
|
goto failed;
|
|
}
|
|
|
|
nilfs_finish_roll_forward(nilfs, ri);
|
|
}
|
|
|
|
failed:
|
|
nilfs_put_root(root);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nilfs_search_super_root - search the latest valid super root
|
|
* @nilfs: the_nilfs
|
|
* @ri: pointer to a nilfs_recovery_info struct to store search results.
|
|
*
|
|
* nilfs_search_super_root() looks for the latest super-root from a partial
|
|
* segment pointed by the superblock. It sets up struct the_nilfs through
|
|
* this search. It fills nilfs_recovery_info (ri) required for recovery.
|
|
*
|
|
* Return Value: On success, 0 is returned. On error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EINVAL - No valid segment found
|
|
*
|
|
* %-EIO - I/O error
|
|
*
|
|
* %-ENOMEM - Insufficient memory available.
|
|
*/
|
|
int nilfs_search_super_root(struct the_nilfs *nilfs,
|
|
struct nilfs_recovery_info *ri)
|
|
{
|
|
struct buffer_head *bh_sum = NULL;
|
|
struct nilfs_segment_summary *sum = NULL;
|
|
sector_t pseg_start, pseg_end, sr_pseg_start = 0;
|
|
sector_t seg_start, seg_end; /* range of full segment (block number) */
|
|
sector_t b, end;
|
|
unsigned long nblocks;
|
|
unsigned int flags;
|
|
u64 seg_seq;
|
|
__u64 segnum, nextnum = 0;
|
|
__u64 cno;
|
|
LIST_HEAD(segments);
|
|
int empty_seg = 0, scan_newer = 0;
|
|
int ret;
|
|
|
|
pseg_start = nilfs->ns_last_pseg;
|
|
seg_seq = nilfs->ns_last_seq;
|
|
cno = nilfs->ns_last_cno;
|
|
segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
|
|
|
|
/* Calculate range of segment */
|
|
nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
|
|
|
|
/* Read ahead segment */
|
|
b = seg_start;
|
|
while (b <= seg_end)
|
|
__breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize);
|
|
|
|
for (;;) {
|
|
brelse(bh_sum);
|
|
ret = NILFS_SEG_FAIL_IO;
|
|
bh_sum = nilfs_read_log_header(nilfs, pseg_start, &sum);
|
|
if (!bh_sum)
|
|
goto failed;
|
|
|
|
ret = nilfs_validate_log(nilfs, seg_seq, bh_sum, sum);
|
|
if (ret) {
|
|
if (ret == NILFS_SEG_FAIL_IO)
|
|
goto failed;
|
|
goto strayed;
|
|
}
|
|
|
|
nblocks = le32_to_cpu(sum->ss_nblocks);
|
|
pseg_end = pseg_start + nblocks - 1;
|
|
if (unlikely(pseg_end > seg_end)) {
|
|
ret = NILFS_SEG_FAIL_CONSISTENCY;
|
|
goto strayed;
|
|
}
|
|
|
|
/* A valid partial segment */
|
|
ri->ri_pseg_start = pseg_start;
|
|
ri->ri_seq = seg_seq;
|
|
ri->ri_segnum = segnum;
|
|
nextnum = nilfs_get_segnum_of_block(nilfs,
|
|
le64_to_cpu(sum->ss_next));
|
|
ri->ri_nextnum = nextnum;
|
|
empty_seg = 0;
|
|
|
|
flags = le16_to_cpu(sum->ss_flags);
|
|
if (!(flags & NILFS_SS_SR) && !scan_newer) {
|
|
/*
|
|
* This will never happen because a superblock
|
|
* (last_segment) always points to a pseg with
|
|
* a super root.
|
|
*/
|
|
ret = NILFS_SEG_FAIL_CONSISTENCY;
|
|
goto failed;
|
|
}
|
|
|
|
if (pseg_start == seg_start) {
|
|
nilfs_get_segment_range(nilfs, nextnum, &b, &end);
|
|
while (b <= end)
|
|
__breadahead(nilfs->ns_bdev, b++,
|
|
nilfs->ns_blocksize);
|
|
}
|
|
if (!(flags & NILFS_SS_SR)) {
|
|
if (!ri->ri_lsegs_start && (flags & NILFS_SS_LOGBGN)) {
|
|
ri->ri_lsegs_start = pseg_start;
|
|
ri->ri_lsegs_start_seq = seg_seq;
|
|
}
|
|
if (flags & NILFS_SS_LOGEND)
|
|
ri->ri_lsegs_end = pseg_start;
|
|
goto try_next_pseg;
|
|
}
|
|
|
|
/* A valid super root was found. */
|
|
ri->ri_cno = cno++;
|
|
ri->ri_super_root = pseg_end;
|
|
ri->ri_lsegs_start = ri->ri_lsegs_end = 0;
|
|
|
|
nilfs_dispose_segment_list(&segments);
|
|
sr_pseg_start = pseg_start;
|
|
nilfs->ns_pseg_offset = pseg_start + nblocks - seg_start;
|
|
nilfs->ns_seg_seq = seg_seq;
|
|
nilfs->ns_segnum = segnum;
|
|
nilfs->ns_cno = cno; /* nilfs->ns_cno = ri->ri_cno + 1 */
|
|
nilfs->ns_ctime = le64_to_cpu(sum->ss_create);
|
|
nilfs->ns_nextnum = nextnum;
|
|
|
|
if (scan_newer)
|
|
ri->ri_need_recovery = NILFS_RECOVERY_SR_UPDATED;
|
|
else {
|
|
if (nilfs->ns_mount_state & NILFS_VALID_FS)
|
|
goto super_root_found;
|
|
scan_newer = 1;
|
|
}
|
|
|
|
try_next_pseg:
|
|
/* Standing on a course, or met an inconsistent state */
|
|
pseg_start += nblocks;
|
|
if (pseg_start < seg_end)
|
|
continue;
|
|
goto feed_segment;
|
|
|
|
strayed:
|
|
/* Off the trail */
|
|
if (!scan_newer)
|
|
/*
|
|
* This can happen if a checkpoint was written without
|
|
* barriers, or as a result of an I/O failure.
|
|
*/
|
|
goto failed;
|
|
|
|
feed_segment:
|
|
/* Looking to the next full segment */
|
|
if (empty_seg++)
|
|
goto super_root_found; /* found a valid super root */
|
|
|
|
ret = nilfs_segment_list_add(&segments, segnum);
|
|
if (unlikely(ret))
|
|
goto failed;
|
|
|
|
seg_seq++;
|
|
segnum = nextnum;
|
|
nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
|
|
pseg_start = seg_start;
|
|
}
|
|
|
|
super_root_found:
|
|
/* Updating pointers relating to the latest checkpoint */
|
|
brelse(bh_sum);
|
|
list_splice_tail(&segments, &ri->ri_used_segments);
|
|
nilfs->ns_last_pseg = sr_pseg_start;
|
|
nilfs->ns_last_seq = nilfs->ns_seg_seq;
|
|
nilfs->ns_last_cno = ri->ri_cno;
|
|
return 0;
|
|
|
|
failed:
|
|
brelse(bh_sum);
|
|
nilfs_dispose_segment_list(&segments);
|
|
return ret < 0 ? ret : nilfs_warn_segment_error(nilfs->ns_sb, ret);
|
|
}
|