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- /*
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Written by Ryusuke Konishi <ryusuke@osrg.net>
- */
- #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(int err)
- {
- switch (err) {
- case NILFS_SEG_FAIL_IO:
- printk(KERN_WARNING
- "NILFS warning: I/O error on loading last segment\n");
- return -EIO;
- case NILFS_SEG_FAIL_MAGIC:
- printk(KERN_WARNING
- "NILFS warning: Segment magic number invalid\n");
- break;
- case NILFS_SEG_FAIL_SEQ:
- printk(KERN_WARNING
- "NILFS warning: Sequence number mismatch\n");
- break;
- case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT:
- printk(KERN_WARNING
- "NILFS warning: Checksum error in super root\n");
- break;
- case NILFS_SEG_FAIL_CHECKSUM_FULL:
- printk(KERN_WARNING
- "NILFS warning: Checksum error in segment payload\n");
- break;
- case NILFS_SEG_FAIL_CONSISTENCY:
- printk(KERN_WARNING
- "NILFS warning: Inconsistent segment\n");
- break;
- case NILFS_SEG_NO_SUPER_ROOT:
- printk(KERN_WARNING
- "NILFS warning: No super root in the last segment\n");
- break;
- }
- 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 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(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 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);
- page_cache_release(page);
- (*nr_salvaged_blocks)++;
- goto next;
- failed_page:
- unlock_page(page);
- page_cache_release(page);
- failed_inode:
- printk(KERN_WARNING
- "NILFS warning: error recovering data block "
- "(err=%d, ino=%lu, block-offset=%llu)\n",
- 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) {
- printk(KERN_INFO "NILFS (device %s): salvaged %lu blocks\n",
- sb->s_id, 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:
- printk(KERN_ERR
- "NILFS (device %s): Error roll-forwarding "
- "(err=%d, pseg block=%llu). ",
- sb->s_id, 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))
- printk(KERN_WARNING
- "NILFS warning: buffer sync write failed during "
- "post-cleaning of recovery.\n");
- 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)) {
- printk(KERN_ERR
- "NILFS: error loading the latest checkpoint.\n");
- 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)) {
- printk(KERN_ERR "NILFS: Error preparing segments for "
- "recovery.\n");
- 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)) {
- printk(KERN_ERR "NILFS: Oops! recovery failed. "
- "(err=%d)\n", 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
- having 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(ret);
- }
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