10f3e1c7fSRyusuke Konishi /* 20f3e1c7fSRyusuke Konishi * recovery.c - NILFS recovery logic 30f3e1c7fSRyusuke Konishi * 40f3e1c7fSRyusuke Konishi * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 50f3e1c7fSRyusuke Konishi * 60f3e1c7fSRyusuke Konishi * This program is free software; you can redistribute it and/or modify 70f3e1c7fSRyusuke Konishi * it under the terms of the GNU General Public License as published by 80f3e1c7fSRyusuke Konishi * the Free Software Foundation; either version 2 of the License, or 90f3e1c7fSRyusuke Konishi * (at your option) any later version. 100f3e1c7fSRyusuke Konishi * 110f3e1c7fSRyusuke Konishi * This program is distributed in the hope that it will be useful, 120f3e1c7fSRyusuke Konishi * but WITHOUT ANY WARRANTY; without even the implied warranty of 130f3e1c7fSRyusuke Konishi * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 140f3e1c7fSRyusuke Konishi * GNU General Public License for more details. 150f3e1c7fSRyusuke Konishi * 160f3e1c7fSRyusuke Konishi * You should have received a copy of the GNU General Public License 170f3e1c7fSRyusuke Konishi * along with this program; if not, write to the Free Software 180f3e1c7fSRyusuke Konishi * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 190f3e1c7fSRyusuke Konishi * 200f3e1c7fSRyusuke Konishi * Written by Ryusuke Konishi <ryusuke@osrg.net> 210f3e1c7fSRyusuke Konishi */ 220f3e1c7fSRyusuke Konishi 230f3e1c7fSRyusuke Konishi #include <linux/buffer_head.h> 240f3e1c7fSRyusuke Konishi #include <linux/blkdev.h> 250f3e1c7fSRyusuke Konishi #include <linux/swap.h> 265a0e3ad6STejun Heo #include <linux/slab.h> 270f3e1c7fSRyusuke Konishi #include <linux/crc32.h> 280f3e1c7fSRyusuke Konishi #include "nilfs.h" 290f3e1c7fSRyusuke Konishi #include "segment.h" 300f3e1c7fSRyusuke Konishi #include "sufile.h" 310f3e1c7fSRyusuke Konishi #include "page.h" 320f3e1c7fSRyusuke Konishi #include "segbuf.h" 330f3e1c7fSRyusuke Konishi 340f3e1c7fSRyusuke Konishi /* 350f3e1c7fSRyusuke Konishi * Segment check result 360f3e1c7fSRyusuke Konishi */ 370f3e1c7fSRyusuke Konishi enum { 380f3e1c7fSRyusuke Konishi NILFS_SEG_VALID, 390f3e1c7fSRyusuke Konishi NILFS_SEG_NO_SUPER_ROOT, 400f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_IO, 410f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_MAGIC, 420f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_SEQ, 430f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT, 440f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_CHECKSUM_FULL, 450f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_CONSISTENCY, 460f3e1c7fSRyusuke Konishi }; 470f3e1c7fSRyusuke Konishi 480f3e1c7fSRyusuke Konishi /* work structure for recovery */ 490f3e1c7fSRyusuke Konishi struct nilfs_recovery_block { 500f3e1c7fSRyusuke Konishi ino_t ino; /* Inode number of the file that this block 510f3e1c7fSRyusuke Konishi belongs to */ 520f3e1c7fSRyusuke Konishi sector_t blocknr; /* block number */ 530f3e1c7fSRyusuke Konishi __u64 vblocknr; /* virtual block number */ 540f3e1c7fSRyusuke Konishi unsigned long blkoff; /* File offset of the data block (per block) */ 550f3e1c7fSRyusuke Konishi struct list_head list; 560f3e1c7fSRyusuke Konishi }; 570f3e1c7fSRyusuke Konishi 580f3e1c7fSRyusuke Konishi 590f3e1c7fSRyusuke Konishi static int nilfs_warn_segment_error(int err) 600f3e1c7fSRyusuke Konishi { 610f3e1c7fSRyusuke Konishi switch (err) { 620f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_IO: 630f3e1c7fSRyusuke Konishi printk(KERN_WARNING 640f3e1c7fSRyusuke Konishi "NILFS warning: I/O error on loading last segment\n"); 650f3e1c7fSRyusuke Konishi return -EIO; 660f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_MAGIC: 670f3e1c7fSRyusuke Konishi printk(KERN_WARNING 680f3e1c7fSRyusuke Konishi "NILFS warning: Segment magic number invalid\n"); 690f3e1c7fSRyusuke Konishi break; 700f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_SEQ: 710f3e1c7fSRyusuke Konishi printk(KERN_WARNING 720f3e1c7fSRyusuke Konishi "NILFS warning: Sequence number mismatch\n"); 730f3e1c7fSRyusuke Konishi break; 740f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT: 750f3e1c7fSRyusuke Konishi printk(KERN_WARNING 760f3e1c7fSRyusuke Konishi "NILFS warning: Checksum error in super root\n"); 770f3e1c7fSRyusuke Konishi break; 780f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_CHECKSUM_FULL: 790f3e1c7fSRyusuke Konishi printk(KERN_WARNING 800f3e1c7fSRyusuke Konishi "NILFS warning: Checksum error in segment payload\n"); 810f3e1c7fSRyusuke Konishi break; 820f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_CONSISTENCY: 830f3e1c7fSRyusuke Konishi printk(KERN_WARNING 840f3e1c7fSRyusuke Konishi "NILFS warning: Inconsistent segment\n"); 850f3e1c7fSRyusuke Konishi break; 860f3e1c7fSRyusuke Konishi case NILFS_SEG_NO_SUPER_ROOT: 870f3e1c7fSRyusuke Konishi printk(KERN_WARNING 880f3e1c7fSRyusuke Konishi "NILFS warning: No super root in the last segment\n"); 890f3e1c7fSRyusuke Konishi break; 900f3e1c7fSRyusuke Konishi } 910f3e1c7fSRyusuke Konishi return -EINVAL; 920f3e1c7fSRyusuke Konishi } 930f3e1c7fSRyusuke Konishi 940f3e1c7fSRyusuke Konishi static void store_segsum_info(struct nilfs_segsum_info *ssi, 950f3e1c7fSRyusuke Konishi struct nilfs_segment_summary *sum, 960f3e1c7fSRyusuke Konishi unsigned int blocksize) 970f3e1c7fSRyusuke Konishi { 980f3e1c7fSRyusuke Konishi ssi->flags = le16_to_cpu(sum->ss_flags); 990f3e1c7fSRyusuke Konishi ssi->seg_seq = le64_to_cpu(sum->ss_seq); 1000f3e1c7fSRyusuke Konishi ssi->ctime = le64_to_cpu(sum->ss_create); 1010f3e1c7fSRyusuke Konishi ssi->next = le64_to_cpu(sum->ss_next); 1020f3e1c7fSRyusuke Konishi ssi->nblocks = le32_to_cpu(sum->ss_nblocks); 1030f3e1c7fSRyusuke Konishi ssi->nfinfo = le32_to_cpu(sum->ss_nfinfo); 1040f3e1c7fSRyusuke Konishi ssi->sumbytes = le32_to_cpu(sum->ss_sumbytes); 1050f3e1c7fSRyusuke Konishi 1060f3e1c7fSRyusuke Konishi ssi->nsumblk = DIV_ROUND_UP(ssi->sumbytes, blocksize); 1070f3e1c7fSRyusuke Konishi ssi->nfileblk = ssi->nblocks - ssi->nsumblk - !!NILFS_SEG_HAS_SR(ssi); 10850614bcfSRyusuke Konishi 10950614bcfSRyusuke Konishi /* need to verify ->ss_bytes field if read ->ss_cno */ 1100f3e1c7fSRyusuke Konishi } 1110f3e1c7fSRyusuke Konishi 1120f3e1c7fSRyusuke Konishi /** 1138b94025cSRyusuke Konishi * nilfs_compute_checksum - compute checksum of blocks continuously 1148b94025cSRyusuke Konishi * @nilfs: nilfs object 1150f3e1c7fSRyusuke Konishi * @bhs: buffer head of start block 1160f3e1c7fSRyusuke Konishi * @sum: place to store result 1170f3e1c7fSRyusuke Konishi * @offset: offset bytes in the first block 1180f3e1c7fSRyusuke Konishi * @check_bytes: number of bytes to be checked 1190f3e1c7fSRyusuke Konishi * @start: DBN of start block 1200f3e1c7fSRyusuke Konishi * @nblock: number of blocks to be checked 1210f3e1c7fSRyusuke Konishi */ 1228b94025cSRyusuke Konishi static int nilfs_compute_checksum(struct the_nilfs *nilfs, 1238b94025cSRyusuke Konishi struct buffer_head *bhs, u32 *sum, 1248b94025cSRyusuke Konishi unsigned long offset, u64 check_bytes, 1250f3e1c7fSRyusuke Konishi sector_t start, unsigned long nblock) 1260f3e1c7fSRyusuke Konishi { 1278b94025cSRyusuke Konishi unsigned int blocksize = nilfs->ns_blocksize; 1280f3e1c7fSRyusuke Konishi unsigned long size; 1290f3e1c7fSRyusuke Konishi u32 crc; 1300f3e1c7fSRyusuke Konishi 1310f3e1c7fSRyusuke Konishi BUG_ON(offset >= blocksize); 1320f3e1c7fSRyusuke Konishi check_bytes -= offset; 1330f3e1c7fSRyusuke Konishi size = min_t(u64, check_bytes, blocksize - offset); 1348b94025cSRyusuke Konishi crc = crc32_le(nilfs->ns_crc_seed, 1350f3e1c7fSRyusuke Konishi (unsigned char *)bhs->b_data + offset, size); 1360f3e1c7fSRyusuke Konishi if (--nblock > 0) { 1370f3e1c7fSRyusuke Konishi do { 1388b94025cSRyusuke Konishi struct buffer_head *bh; 1398b94025cSRyusuke Konishi 1408b94025cSRyusuke Konishi bh = __bread(nilfs->ns_bdev, ++start, blocksize); 1410f3e1c7fSRyusuke Konishi if (!bh) 1420f3e1c7fSRyusuke Konishi return -EIO; 1430f3e1c7fSRyusuke Konishi check_bytes -= size; 1440f3e1c7fSRyusuke Konishi size = min_t(u64, check_bytes, blocksize); 1450f3e1c7fSRyusuke Konishi crc = crc32_le(crc, bh->b_data, size); 1460f3e1c7fSRyusuke Konishi brelse(bh); 1470f3e1c7fSRyusuke Konishi } while (--nblock > 0); 1480f3e1c7fSRyusuke Konishi } 1490f3e1c7fSRyusuke Konishi *sum = crc; 1500f3e1c7fSRyusuke Konishi return 0; 1510f3e1c7fSRyusuke Konishi } 1520f3e1c7fSRyusuke Konishi 1530f3e1c7fSRyusuke Konishi /** 1540f3e1c7fSRyusuke Konishi * nilfs_read_super_root_block - read super root block 1558b94025cSRyusuke Konishi * @nilfs: nilfs object 1560f3e1c7fSRyusuke Konishi * @sr_block: disk block number of the super root block 1570f3e1c7fSRyusuke Konishi * @pbh: address of a buffer_head pointer to return super root buffer 1580f3e1c7fSRyusuke Konishi * @check: CRC check flag 1590f3e1c7fSRyusuke Konishi */ 1608b94025cSRyusuke Konishi int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block, 1610f3e1c7fSRyusuke Konishi struct buffer_head **pbh, int check) 1620f3e1c7fSRyusuke Konishi { 1630f3e1c7fSRyusuke Konishi struct buffer_head *bh_sr; 1640f3e1c7fSRyusuke Konishi struct nilfs_super_root *sr; 1650f3e1c7fSRyusuke Konishi u32 crc; 1660f3e1c7fSRyusuke Konishi int ret; 1670f3e1c7fSRyusuke Konishi 1680f3e1c7fSRyusuke Konishi *pbh = NULL; 1698b94025cSRyusuke Konishi bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize); 1700f3e1c7fSRyusuke Konishi if (unlikely(!bh_sr)) { 1710f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 1720f3e1c7fSRyusuke Konishi goto failed; 1730f3e1c7fSRyusuke Konishi } 1740f3e1c7fSRyusuke Konishi 1750f3e1c7fSRyusuke Konishi sr = (struct nilfs_super_root *)bh_sr->b_data; 1760f3e1c7fSRyusuke Konishi if (check) { 1770f3e1c7fSRyusuke Konishi unsigned bytes = le16_to_cpu(sr->sr_bytes); 1780f3e1c7fSRyusuke Konishi 1798b94025cSRyusuke Konishi if (bytes == 0 || bytes > nilfs->ns_blocksize) { 1800f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT; 1810f3e1c7fSRyusuke Konishi goto failed_bh; 1820f3e1c7fSRyusuke Konishi } 1838b94025cSRyusuke Konishi if (nilfs_compute_checksum( 1848b94025cSRyusuke Konishi nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes, 1858b94025cSRyusuke Konishi sr_block, 1)) { 1860f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 1870f3e1c7fSRyusuke Konishi goto failed_bh; 1880f3e1c7fSRyusuke Konishi } 1890f3e1c7fSRyusuke Konishi if (crc != le32_to_cpu(sr->sr_sum)) { 1900f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT; 1910f3e1c7fSRyusuke Konishi goto failed_bh; 1920f3e1c7fSRyusuke Konishi } 1930f3e1c7fSRyusuke Konishi } 1940f3e1c7fSRyusuke Konishi *pbh = bh_sr; 1950f3e1c7fSRyusuke Konishi return 0; 1960f3e1c7fSRyusuke Konishi 1970f3e1c7fSRyusuke Konishi failed_bh: 1980f3e1c7fSRyusuke Konishi brelse(bh_sr); 1990f3e1c7fSRyusuke Konishi 2000f3e1c7fSRyusuke Konishi failed: 2010f3e1c7fSRyusuke Konishi return nilfs_warn_segment_error(ret); 2020f3e1c7fSRyusuke Konishi } 2030f3e1c7fSRyusuke Konishi 2040f3e1c7fSRyusuke Konishi /** 2050f3e1c7fSRyusuke Konishi * load_segment_summary - read segment summary of the specified partial segment 2068b94025cSRyusuke Konishi * @nilfs: nilfs object 2070f3e1c7fSRyusuke Konishi * @pseg_start: start disk block number of partial segment 2080f3e1c7fSRyusuke Konishi * @seg_seq: sequence number requested 2090f3e1c7fSRyusuke Konishi * @ssi: pointer to nilfs_segsum_info struct to store information 2100f3e1c7fSRyusuke Konishi */ 2110f3e1c7fSRyusuke Konishi static int 2128b94025cSRyusuke Konishi load_segment_summary(struct the_nilfs *nilfs, sector_t pseg_start, 21303f29365SJiro SEKIBA u64 seg_seq, struct nilfs_segsum_info *ssi) 2140f3e1c7fSRyusuke Konishi { 2150f3e1c7fSRyusuke Konishi struct buffer_head *bh_sum; 2160f3e1c7fSRyusuke Konishi struct nilfs_segment_summary *sum; 21703f29365SJiro SEKIBA unsigned long nblock; 21803f29365SJiro SEKIBA u32 crc; 2190f3e1c7fSRyusuke Konishi int ret = NILFS_SEG_FAIL_IO; 2200f3e1c7fSRyusuke Konishi 2218b94025cSRyusuke Konishi bh_sum = __bread(nilfs->ns_bdev, pseg_start, nilfs->ns_blocksize); 2220f3e1c7fSRyusuke Konishi if (!bh_sum) 2230f3e1c7fSRyusuke Konishi goto out; 2240f3e1c7fSRyusuke Konishi 2250f3e1c7fSRyusuke Konishi sum = (struct nilfs_segment_summary *)bh_sum->b_data; 2260f3e1c7fSRyusuke Konishi 2270f3e1c7fSRyusuke Konishi /* Check consistency of segment summary */ 2280f3e1c7fSRyusuke Konishi if (le32_to_cpu(sum->ss_magic) != NILFS_SEGSUM_MAGIC) { 2290f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_MAGIC; 2300f3e1c7fSRyusuke Konishi goto failed; 2310f3e1c7fSRyusuke Konishi } 2328b94025cSRyusuke Konishi store_segsum_info(ssi, sum, nilfs->ns_blocksize); 2330f3e1c7fSRyusuke Konishi if (seg_seq != ssi->seg_seq) { 2340f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_SEQ; 2350f3e1c7fSRyusuke Konishi goto failed; 2360f3e1c7fSRyusuke Konishi } 2370f3e1c7fSRyusuke Konishi 23803f29365SJiro SEKIBA nblock = ssi->nblocks; 2398b94025cSRyusuke Konishi if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment)) { 2400f3e1c7fSRyusuke Konishi /* This limits the number of blocks read in the CRC check */ 2410f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CONSISTENCY; 2420f3e1c7fSRyusuke Konishi goto failed; 2430f3e1c7fSRyusuke Konishi } 2448b94025cSRyusuke Konishi if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum), 2458b94025cSRyusuke Konishi ((u64)nblock << nilfs->ns_blocksize_bits), 2460f3e1c7fSRyusuke Konishi pseg_start, nblock)) { 2470f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 2480f3e1c7fSRyusuke Konishi goto failed; 2490f3e1c7fSRyusuke Konishi } 25003f29365SJiro SEKIBA if (crc == le32_to_cpu(sum->ss_datasum)) 2510f3e1c7fSRyusuke Konishi ret = 0; 25203f29365SJiro SEKIBA else 25303f29365SJiro SEKIBA ret = NILFS_SEG_FAIL_CHECKSUM_FULL; 2540f3e1c7fSRyusuke Konishi failed: 2550f3e1c7fSRyusuke Konishi brelse(bh_sum); 2560f3e1c7fSRyusuke Konishi out: 2570f3e1c7fSRyusuke Konishi return ret; 2580f3e1c7fSRyusuke Konishi } 2590f3e1c7fSRyusuke Konishi 2608b94025cSRyusuke Konishi /** 2618b94025cSRyusuke Konishi * nilfs_read_summary_info - read an item on summary blocks of a log 2628b94025cSRyusuke Konishi * @nilfs: nilfs object 2638b94025cSRyusuke Konishi * @pbh: the current buffer head on summary blocks [in, out] 2648b94025cSRyusuke Konishi * @offset: the current byte offset on summary blocks [in, out] 2658b94025cSRyusuke Konishi * @bytes: byte size of the item to be read 2668b94025cSRyusuke Konishi */ 2678b94025cSRyusuke Konishi static void *nilfs_read_summary_info(struct the_nilfs *nilfs, 2688b94025cSRyusuke Konishi struct buffer_head **pbh, 2690f3e1c7fSRyusuke Konishi unsigned int *offset, unsigned int bytes) 2700f3e1c7fSRyusuke Konishi { 2710f3e1c7fSRyusuke Konishi void *ptr; 2720f3e1c7fSRyusuke Konishi sector_t blocknr; 2730f3e1c7fSRyusuke Konishi 2740f3e1c7fSRyusuke Konishi BUG_ON((*pbh)->b_size < *offset); 2750f3e1c7fSRyusuke Konishi if (bytes > (*pbh)->b_size - *offset) { 2760f3e1c7fSRyusuke Konishi blocknr = (*pbh)->b_blocknr; 2770f3e1c7fSRyusuke Konishi brelse(*pbh); 2788b94025cSRyusuke Konishi *pbh = __bread(nilfs->ns_bdev, blocknr + 1, 2798b94025cSRyusuke Konishi nilfs->ns_blocksize); 2800f3e1c7fSRyusuke Konishi if (unlikely(!*pbh)) 2810f3e1c7fSRyusuke Konishi return NULL; 2820f3e1c7fSRyusuke Konishi *offset = 0; 2830f3e1c7fSRyusuke Konishi } 2840f3e1c7fSRyusuke Konishi ptr = (*pbh)->b_data + *offset; 2850f3e1c7fSRyusuke Konishi *offset += bytes; 2860f3e1c7fSRyusuke Konishi return ptr; 2870f3e1c7fSRyusuke Konishi } 2880f3e1c7fSRyusuke Konishi 2898b94025cSRyusuke Konishi /** 2908b94025cSRyusuke Konishi * nilfs_skip_summary_info - skip items on summary blocks of a log 2918b94025cSRyusuke Konishi * @nilfs: nilfs object 2928b94025cSRyusuke Konishi * @pbh: the current buffer head on summary blocks [in, out] 2938b94025cSRyusuke Konishi * @offset: the current byte offset on summary blocks [in, out] 2948b94025cSRyusuke Konishi * @bytes: byte size of the item to be skipped 2958b94025cSRyusuke Konishi * @count: number of items to be skipped 2968b94025cSRyusuke Konishi */ 2978b94025cSRyusuke Konishi static void nilfs_skip_summary_info(struct the_nilfs *nilfs, 2988b94025cSRyusuke Konishi struct buffer_head **pbh, 2990f3e1c7fSRyusuke Konishi unsigned int *offset, unsigned int bytes, 3000f3e1c7fSRyusuke Konishi unsigned long count) 3010f3e1c7fSRyusuke Konishi { 3020f3e1c7fSRyusuke Konishi unsigned int rest_item_in_current_block 3030f3e1c7fSRyusuke Konishi = ((*pbh)->b_size - *offset) / bytes; 3040f3e1c7fSRyusuke Konishi 3050f3e1c7fSRyusuke Konishi if (count <= rest_item_in_current_block) { 3060f3e1c7fSRyusuke Konishi *offset += bytes * count; 3070f3e1c7fSRyusuke Konishi } else { 3080f3e1c7fSRyusuke Konishi sector_t blocknr = (*pbh)->b_blocknr; 3090f3e1c7fSRyusuke Konishi unsigned int nitem_per_block = (*pbh)->b_size / bytes; 3100f3e1c7fSRyusuke Konishi unsigned int bcnt; 3110f3e1c7fSRyusuke Konishi 3120f3e1c7fSRyusuke Konishi count -= rest_item_in_current_block; 3130f3e1c7fSRyusuke Konishi bcnt = DIV_ROUND_UP(count, nitem_per_block); 3140f3e1c7fSRyusuke Konishi *offset = bytes * (count - (bcnt - 1) * nitem_per_block); 3150f3e1c7fSRyusuke Konishi 3160f3e1c7fSRyusuke Konishi brelse(*pbh); 3178b94025cSRyusuke Konishi *pbh = __bread(nilfs->ns_bdev, blocknr + bcnt, 3188b94025cSRyusuke Konishi nilfs->ns_blocksize); 3190f3e1c7fSRyusuke Konishi } 3200f3e1c7fSRyusuke Konishi } 3210f3e1c7fSRyusuke Konishi 3228b94025cSRyusuke Konishi /** 3238b94025cSRyusuke Konishi * nilfs_scan_dsync_log - get block information of a log written for data sync 3248b94025cSRyusuke Konishi * @nilfs: nilfs object 3258b94025cSRyusuke Konishi * @start_blocknr: start block number of the log 3268b94025cSRyusuke Konishi * @ssi: log summary information 3278b94025cSRyusuke Konishi * @head: list head to add nilfs_recovery_block struct 3288b94025cSRyusuke Konishi */ 3298b94025cSRyusuke Konishi static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr, 3300f3e1c7fSRyusuke Konishi struct nilfs_segsum_info *ssi, 3310f3e1c7fSRyusuke Konishi struct list_head *head) 3320f3e1c7fSRyusuke Konishi { 3330f3e1c7fSRyusuke Konishi struct buffer_head *bh; 3340f3e1c7fSRyusuke Konishi unsigned int offset; 3350f3e1c7fSRyusuke Konishi unsigned long nfinfo = ssi->nfinfo; 3368b94025cSRyusuke Konishi sector_t blocknr = start_blocknr + ssi->nsumblk; 3370f3e1c7fSRyusuke Konishi ino_t ino; 3380f3e1c7fSRyusuke Konishi int err = -EIO; 3390f3e1c7fSRyusuke Konishi 3400f3e1c7fSRyusuke Konishi if (!nfinfo) 3410f3e1c7fSRyusuke Konishi return 0; 3420f3e1c7fSRyusuke Konishi 3438b94025cSRyusuke Konishi bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize); 3440f3e1c7fSRyusuke Konishi if (unlikely(!bh)) 3450f3e1c7fSRyusuke Konishi goto out; 3460f3e1c7fSRyusuke Konishi 3470f3e1c7fSRyusuke Konishi offset = le16_to_cpu( 3480f3e1c7fSRyusuke Konishi ((struct nilfs_segment_summary *)bh->b_data)->ss_bytes); 3490f3e1c7fSRyusuke Konishi for (;;) { 3500f3e1c7fSRyusuke Konishi unsigned long nblocks, ndatablk, nnodeblk; 3510f3e1c7fSRyusuke Konishi struct nilfs_finfo *finfo; 3520f3e1c7fSRyusuke Konishi 3538b94025cSRyusuke Konishi finfo = nilfs_read_summary_info(nilfs, &bh, &offset, 3548b94025cSRyusuke Konishi sizeof(*finfo)); 3550f3e1c7fSRyusuke Konishi if (unlikely(!finfo)) 3560f3e1c7fSRyusuke Konishi goto out; 3570f3e1c7fSRyusuke Konishi 3580f3e1c7fSRyusuke Konishi ino = le64_to_cpu(finfo->fi_ino); 3590f3e1c7fSRyusuke Konishi nblocks = le32_to_cpu(finfo->fi_nblocks); 3600f3e1c7fSRyusuke Konishi ndatablk = le32_to_cpu(finfo->fi_ndatablk); 3610f3e1c7fSRyusuke Konishi nnodeblk = nblocks - ndatablk; 3620f3e1c7fSRyusuke Konishi 3630f3e1c7fSRyusuke Konishi while (ndatablk-- > 0) { 3640f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb; 3650f3e1c7fSRyusuke Konishi struct nilfs_binfo_v *binfo; 3660f3e1c7fSRyusuke Konishi 3678b94025cSRyusuke Konishi binfo = nilfs_read_summary_info(nilfs, &bh, &offset, 3680f3e1c7fSRyusuke Konishi sizeof(*binfo)); 3690f3e1c7fSRyusuke Konishi if (unlikely(!binfo)) 3700f3e1c7fSRyusuke Konishi goto out; 3710f3e1c7fSRyusuke Konishi 3720f3e1c7fSRyusuke Konishi rb = kmalloc(sizeof(*rb), GFP_NOFS); 3730f3e1c7fSRyusuke Konishi if (unlikely(!rb)) { 3740f3e1c7fSRyusuke Konishi err = -ENOMEM; 3750f3e1c7fSRyusuke Konishi goto out; 3760f3e1c7fSRyusuke Konishi } 3770f3e1c7fSRyusuke Konishi rb->ino = ino; 3780f3e1c7fSRyusuke Konishi rb->blocknr = blocknr++; 3790f3e1c7fSRyusuke Konishi rb->vblocknr = le64_to_cpu(binfo->bi_vblocknr); 3800f3e1c7fSRyusuke Konishi rb->blkoff = le64_to_cpu(binfo->bi_blkoff); 3810f3e1c7fSRyusuke Konishi /* INIT_LIST_HEAD(&rb->list); */ 3820f3e1c7fSRyusuke Konishi list_add_tail(&rb->list, head); 3830f3e1c7fSRyusuke Konishi } 3840f3e1c7fSRyusuke Konishi if (--nfinfo == 0) 3850f3e1c7fSRyusuke Konishi break; 3868b94025cSRyusuke Konishi blocknr += nnodeblk; /* always 0 for data sync logs */ 3878b94025cSRyusuke Konishi nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64), 3880f3e1c7fSRyusuke Konishi nnodeblk); 3890f3e1c7fSRyusuke Konishi if (unlikely(!bh)) 3900f3e1c7fSRyusuke Konishi goto out; 3910f3e1c7fSRyusuke Konishi } 3920f3e1c7fSRyusuke Konishi err = 0; 3930f3e1c7fSRyusuke Konishi out: 3940f3e1c7fSRyusuke Konishi brelse(bh); /* brelse(NULL) is just ignored */ 3950f3e1c7fSRyusuke Konishi return err; 3960f3e1c7fSRyusuke Konishi } 3970f3e1c7fSRyusuke Konishi 3980f3e1c7fSRyusuke Konishi static void dispose_recovery_list(struct list_head *head) 3990f3e1c7fSRyusuke Konishi { 4000f3e1c7fSRyusuke Konishi while (!list_empty(head)) { 4010f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb 4020f3e1c7fSRyusuke Konishi = list_entry(head->next, 4030f3e1c7fSRyusuke Konishi struct nilfs_recovery_block, list); 4040f3e1c7fSRyusuke Konishi list_del(&rb->list); 4050f3e1c7fSRyusuke Konishi kfree(rb); 4060f3e1c7fSRyusuke Konishi } 4070f3e1c7fSRyusuke Konishi } 4080f3e1c7fSRyusuke Konishi 409654137ddSRyusuke Konishi struct nilfs_segment_entry { 410654137ddSRyusuke Konishi struct list_head list; 411654137ddSRyusuke Konishi __u64 segnum; 412654137ddSRyusuke Konishi }; 413654137ddSRyusuke Konishi 414654137ddSRyusuke Konishi static int nilfs_segment_list_add(struct list_head *head, __u64 segnum) 415654137ddSRyusuke Konishi { 416654137ddSRyusuke Konishi struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS); 417654137ddSRyusuke Konishi 418654137ddSRyusuke Konishi if (unlikely(!ent)) 419654137ddSRyusuke Konishi return -ENOMEM; 420654137ddSRyusuke Konishi 421654137ddSRyusuke Konishi ent->segnum = segnum; 422654137ddSRyusuke Konishi INIT_LIST_HEAD(&ent->list); 423654137ddSRyusuke Konishi list_add_tail(&ent->list, head); 424654137ddSRyusuke Konishi return 0; 425654137ddSRyusuke Konishi } 426654137ddSRyusuke Konishi 4270f3e1c7fSRyusuke Konishi void nilfs_dispose_segment_list(struct list_head *head) 4280f3e1c7fSRyusuke Konishi { 4290f3e1c7fSRyusuke Konishi while (!list_empty(head)) { 4300f3e1c7fSRyusuke Konishi struct nilfs_segment_entry *ent 4310f3e1c7fSRyusuke Konishi = list_entry(head->next, 4320f3e1c7fSRyusuke Konishi struct nilfs_segment_entry, list); 4330f3e1c7fSRyusuke Konishi list_del(&ent->list); 434654137ddSRyusuke Konishi kfree(ent); 4350f3e1c7fSRyusuke Konishi } 4360f3e1c7fSRyusuke Konishi } 4370f3e1c7fSRyusuke Konishi 4380f3e1c7fSRyusuke Konishi static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs, 43985c2a74fSRyusuke Konishi struct nilfs_sb_info *sbi, 4400f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 4410f3e1c7fSRyusuke Konishi { 4420f3e1c7fSRyusuke Konishi struct list_head *head = &ri->ri_used_segments; 4430f3e1c7fSRyusuke Konishi struct nilfs_segment_entry *ent, *n; 4440f3e1c7fSRyusuke Konishi struct inode *sufile = nilfs->ns_sufile; 4450f3e1c7fSRyusuke Konishi __u64 segnum[4]; 4460f3e1c7fSRyusuke Konishi int err; 4470f3e1c7fSRyusuke Konishi int i; 4480f3e1c7fSRyusuke Konishi 4490f3e1c7fSRyusuke Konishi segnum[0] = nilfs->ns_segnum; 4500f3e1c7fSRyusuke Konishi segnum[1] = nilfs->ns_nextnum; 4510f3e1c7fSRyusuke Konishi segnum[2] = ri->ri_segnum; 4520f3e1c7fSRyusuke Konishi segnum[3] = ri->ri_nextnum; 4530f3e1c7fSRyusuke Konishi 45485c2a74fSRyusuke Konishi nilfs_attach_writer(nilfs, sbi); 4550f3e1c7fSRyusuke Konishi /* 4560f3e1c7fSRyusuke Konishi * Releasing the next segment of the latest super root. 4570f3e1c7fSRyusuke Konishi * The next segment is invalidated by this recovery. 4580f3e1c7fSRyusuke Konishi */ 4590f3e1c7fSRyusuke Konishi err = nilfs_sufile_free(sufile, segnum[1]); 4600f3e1c7fSRyusuke Konishi if (unlikely(err)) 4610f3e1c7fSRyusuke Konishi goto failed; 4620f3e1c7fSRyusuke Konishi 4630f3e1c7fSRyusuke Konishi for (i = 1; i < 4; i++) { 464654137ddSRyusuke Konishi err = nilfs_segment_list_add(head, segnum[i]); 465654137ddSRyusuke Konishi if (unlikely(err)) 4660f3e1c7fSRyusuke Konishi goto failed; 4670f3e1c7fSRyusuke Konishi } 4680f3e1c7fSRyusuke Konishi 4690f3e1c7fSRyusuke Konishi /* 4700f3e1c7fSRyusuke Konishi * Collecting segments written after the latest super root. 4712c2e52fcSRyusuke Konishi * These are marked dirty to avoid being reallocated in the next write. 4720f3e1c7fSRyusuke Konishi */ 4730f3e1c7fSRyusuke Konishi list_for_each_entry_safe(ent, n, head, list) { 474c85399c2SRyusuke Konishi if (ent->segnum != segnum[0]) { 475c85399c2SRyusuke Konishi err = nilfs_sufile_scrap(sufile, ent->segnum); 4760f3e1c7fSRyusuke Konishi if (unlikely(err)) 4770f3e1c7fSRyusuke Konishi goto failed; 4782c2e52fcSRyusuke Konishi } 4790f3e1c7fSRyusuke Konishi list_del(&ent->list); 480654137ddSRyusuke Konishi kfree(ent); 4810f3e1c7fSRyusuke Konishi } 4820f3e1c7fSRyusuke Konishi 4830f3e1c7fSRyusuke Konishi /* Allocate new segments for recovery */ 4840f3e1c7fSRyusuke Konishi err = nilfs_sufile_alloc(sufile, &segnum[0]); 4850f3e1c7fSRyusuke Konishi if (unlikely(err)) 4860f3e1c7fSRyusuke Konishi goto failed; 4870f3e1c7fSRyusuke Konishi 4880f3e1c7fSRyusuke Konishi nilfs->ns_pseg_offset = 0; 4890f3e1c7fSRyusuke Konishi nilfs->ns_seg_seq = ri->ri_seq + 2; 4900f3e1c7fSRyusuke Konishi nilfs->ns_nextnum = nilfs->ns_segnum = segnum[0]; 4910f3e1c7fSRyusuke Konishi 4920f3e1c7fSRyusuke Konishi failed: 4930f3e1c7fSRyusuke Konishi /* No need to recover sufile because it will be destroyed on error */ 49485c2a74fSRyusuke Konishi nilfs_detach_writer(nilfs, sbi); 4950f3e1c7fSRyusuke Konishi return err; 4960f3e1c7fSRyusuke Konishi } 4970f3e1c7fSRyusuke Konishi 4988b94025cSRyusuke Konishi static int nilfs_recovery_copy_block(struct the_nilfs *nilfs, 4990f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb, 5000f3e1c7fSRyusuke Konishi struct page *page) 5010f3e1c7fSRyusuke Konishi { 5020f3e1c7fSRyusuke Konishi struct buffer_head *bh_org; 5030f3e1c7fSRyusuke Konishi void *kaddr; 5040f3e1c7fSRyusuke Konishi 5058b94025cSRyusuke Konishi bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize); 5060f3e1c7fSRyusuke Konishi if (unlikely(!bh_org)) 5070f3e1c7fSRyusuke Konishi return -EIO; 5080f3e1c7fSRyusuke Konishi 5090f3e1c7fSRyusuke Konishi kaddr = kmap_atomic(page, KM_USER0); 5100f3e1c7fSRyusuke Konishi memcpy(kaddr + bh_offset(bh_org), bh_org->b_data, bh_org->b_size); 5110f3e1c7fSRyusuke Konishi kunmap_atomic(kaddr, KM_USER0); 5120f3e1c7fSRyusuke Konishi brelse(bh_org); 5130f3e1c7fSRyusuke Konishi return 0; 5140f3e1c7fSRyusuke Konishi } 5150f3e1c7fSRyusuke Konishi 5168b94025cSRyusuke Konishi static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, 5178b94025cSRyusuke Konishi struct nilfs_sb_info *sbi, 5180f3e1c7fSRyusuke Konishi struct list_head *head, 5190f3e1c7fSRyusuke Konishi unsigned long *nr_salvaged_blocks) 5200f3e1c7fSRyusuke Konishi { 5210f3e1c7fSRyusuke Konishi struct inode *inode; 5220f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb, *n; 5238b94025cSRyusuke Konishi unsigned blocksize = nilfs->ns_blocksize; 5240f3e1c7fSRyusuke Konishi struct page *page; 5250f3e1c7fSRyusuke Konishi loff_t pos; 5260f3e1c7fSRyusuke Konishi int err = 0, err2 = 0; 5270f3e1c7fSRyusuke Konishi 5280f3e1c7fSRyusuke Konishi list_for_each_entry_safe(rb, n, head, list) { 5290f3e1c7fSRyusuke Konishi inode = nilfs_iget(sbi->s_super, rb->ino); 5300f3e1c7fSRyusuke Konishi if (IS_ERR(inode)) { 5310f3e1c7fSRyusuke Konishi err = PTR_ERR(inode); 5320f3e1c7fSRyusuke Konishi inode = NULL; 5330f3e1c7fSRyusuke Konishi goto failed_inode; 5340f3e1c7fSRyusuke Konishi } 5350f3e1c7fSRyusuke Konishi 5360f3e1c7fSRyusuke Konishi pos = rb->blkoff << inode->i_blkbits; 5370f3e1c7fSRyusuke Konishi page = NULL; 5380f3e1c7fSRyusuke Konishi err = block_write_begin(NULL, inode->i_mapping, pos, blocksize, 5390f3e1c7fSRyusuke Konishi 0, &page, NULL, nilfs_get_block); 5400f3e1c7fSRyusuke Konishi if (unlikely(err)) 5410f3e1c7fSRyusuke Konishi goto failed_inode; 5420f3e1c7fSRyusuke Konishi 5438b94025cSRyusuke Konishi err = nilfs_recovery_copy_block(nilfs, rb, page); 5440f3e1c7fSRyusuke Konishi if (unlikely(err)) 5450f3e1c7fSRyusuke Konishi goto failed_page; 5460f3e1c7fSRyusuke Konishi 5470f3e1c7fSRyusuke Konishi err = nilfs_set_file_dirty(sbi, inode, 1); 5480f3e1c7fSRyusuke Konishi if (unlikely(err)) 5490f3e1c7fSRyusuke Konishi goto failed_page; 5500f3e1c7fSRyusuke Konishi 5510f3e1c7fSRyusuke Konishi block_write_end(NULL, inode->i_mapping, pos, blocksize, 5520f3e1c7fSRyusuke Konishi blocksize, page, NULL); 5530f3e1c7fSRyusuke Konishi 5540f3e1c7fSRyusuke Konishi unlock_page(page); 5550f3e1c7fSRyusuke Konishi page_cache_release(page); 5560f3e1c7fSRyusuke Konishi 5570f3e1c7fSRyusuke Konishi (*nr_salvaged_blocks)++; 5580f3e1c7fSRyusuke Konishi goto next; 5590f3e1c7fSRyusuke Konishi 5600f3e1c7fSRyusuke Konishi failed_page: 5610f3e1c7fSRyusuke Konishi unlock_page(page); 5620f3e1c7fSRyusuke Konishi page_cache_release(page); 5630f3e1c7fSRyusuke Konishi 5640f3e1c7fSRyusuke Konishi failed_inode: 5650f3e1c7fSRyusuke Konishi printk(KERN_WARNING 5660f3e1c7fSRyusuke Konishi "NILFS warning: error recovering data block " 5670f3e1c7fSRyusuke Konishi "(err=%d, ino=%lu, block-offset=%llu)\n", 568b5696e5eSHeiko Carstens err, (unsigned long)rb->ino, 569b5696e5eSHeiko Carstens (unsigned long long)rb->blkoff); 5700f3e1c7fSRyusuke Konishi if (!err2) 5710f3e1c7fSRyusuke Konishi err2 = err; 5720f3e1c7fSRyusuke Konishi next: 5730f3e1c7fSRyusuke Konishi iput(inode); /* iput(NULL) is just ignored */ 5740f3e1c7fSRyusuke Konishi list_del_init(&rb->list); 5750f3e1c7fSRyusuke Konishi kfree(rb); 5760f3e1c7fSRyusuke Konishi } 5770f3e1c7fSRyusuke Konishi return err2; 5780f3e1c7fSRyusuke Konishi } 5790f3e1c7fSRyusuke Konishi 5800f3e1c7fSRyusuke Konishi /** 5810f3e1c7fSRyusuke Konishi * nilfs_do_roll_forward - salvage logical segments newer than the latest 5820f3e1c7fSRyusuke Konishi * checkpoint 5838b94025cSRyusuke Konishi * @nilfs: nilfs object 5840f3e1c7fSRyusuke Konishi * @sbi: nilfs_sb_info 5850f3e1c7fSRyusuke Konishi * @ri: pointer to a nilfs_recovery_info 5860f3e1c7fSRyusuke Konishi */ 5870f3e1c7fSRyusuke Konishi static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 5880f3e1c7fSRyusuke Konishi struct nilfs_sb_info *sbi, 5890f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 5900f3e1c7fSRyusuke Konishi { 5910f3e1c7fSRyusuke Konishi struct nilfs_segsum_info ssi; 5920f3e1c7fSRyusuke Konishi sector_t pseg_start; 5930f3e1c7fSRyusuke Konishi sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */ 5940f3e1c7fSRyusuke Konishi unsigned long nsalvaged_blocks = 0; 5950f3e1c7fSRyusuke Konishi u64 seg_seq; 5960f3e1c7fSRyusuke Konishi __u64 segnum, nextnum = 0; 5970f3e1c7fSRyusuke Konishi int empty_seg = 0; 5980f3e1c7fSRyusuke Konishi int err = 0, ret; 5990f3e1c7fSRyusuke Konishi LIST_HEAD(dsync_blocks); /* list of data blocks to be recovered */ 6000f3e1c7fSRyusuke Konishi enum { 6010f3e1c7fSRyusuke Konishi RF_INIT_ST, 6020f3e1c7fSRyusuke Konishi RF_DSYNC_ST, /* scanning data-sync segments */ 6030f3e1c7fSRyusuke Konishi }; 6040f3e1c7fSRyusuke Konishi int state = RF_INIT_ST; 6050f3e1c7fSRyusuke Konishi 6060f3e1c7fSRyusuke Konishi nilfs_attach_writer(nilfs, sbi); 6070f3e1c7fSRyusuke Konishi pseg_start = ri->ri_lsegs_start; 6080f3e1c7fSRyusuke Konishi seg_seq = ri->ri_lsegs_start_seq; 6090f3e1c7fSRyusuke Konishi segnum = nilfs_get_segnum_of_block(nilfs, pseg_start); 6100f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 6110f3e1c7fSRyusuke Konishi 6120f3e1c7fSRyusuke Konishi while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) { 6130f3e1c7fSRyusuke Konishi 6148b94025cSRyusuke Konishi ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi); 6150f3e1c7fSRyusuke Konishi if (ret) { 6160f3e1c7fSRyusuke Konishi if (ret == NILFS_SEG_FAIL_IO) { 6170f3e1c7fSRyusuke Konishi err = -EIO; 6180f3e1c7fSRyusuke Konishi goto failed; 6190f3e1c7fSRyusuke Konishi } 6200f3e1c7fSRyusuke Konishi goto strayed; 6210f3e1c7fSRyusuke Konishi } 6220f3e1c7fSRyusuke Konishi if (unlikely(NILFS_SEG_HAS_SR(&ssi))) 6230f3e1c7fSRyusuke Konishi goto confused; 6240f3e1c7fSRyusuke Konishi 6250f3e1c7fSRyusuke Konishi /* Found a valid partial segment; do recovery actions */ 6260f3e1c7fSRyusuke Konishi nextnum = nilfs_get_segnum_of_block(nilfs, ssi.next); 6270f3e1c7fSRyusuke Konishi empty_seg = 0; 6280f3e1c7fSRyusuke Konishi nilfs->ns_ctime = ssi.ctime; 6290f3e1c7fSRyusuke Konishi if (!(ssi.flags & NILFS_SS_GC)) 6300f3e1c7fSRyusuke Konishi nilfs->ns_nongc_ctime = ssi.ctime; 6310f3e1c7fSRyusuke Konishi 6320f3e1c7fSRyusuke Konishi switch (state) { 6330f3e1c7fSRyusuke Konishi case RF_INIT_ST: 6340f3e1c7fSRyusuke Konishi if (!NILFS_SEG_LOGBGN(&ssi) || !NILFS_SEG_DSYNC(&ssi)) 6350f3e1c7fSRyusuke Konishi goto try_next_pseg; 6360f3e1c7fSRyusuke Konishi state = RF_DSYNC_ST; 6370f3e1c7fSRyusuke Konishi /* Fall through */ 6380f3e1c7fSRyusuke Konishi case RF_DSYNC_ST: 6390f3e1c7fSRyusuke Konishi if (!NILFS_SEG_DSYNC(&ssi)) 6400f3e1c7fSRyusuke Konishi goto confused; 6410f3e1c7fSRyusuke Konishi 6428b94025cSRyusuke Konishi err = nilfs_scan_dsync_log(nilfs, pseg_start, &ssi, 6438b94025cSRyusuke Konishi &dsync_blocks); 6440f3e1c7fSRyusuke Konishi if (unlikely(err)) 6450f3e1c7fSRyusuke Konishi goto failed; 6460f3e1c7fSRyusuke Konishi if (NILFS_SEG_LOGEND(&ssi)) { 6478b94025cSRyusuke Konishi err = nilfs_recover_dsync_blocks( 6488b94025cSRyusuke Konishi nilfs, sbi, &dsync_blocks, 6498b94025cSRyusuke Konishi &nsalvaged_blocks); 6500f3e1c7fSRyusuke Konishi if (unlikely(err)) 6510f3e1c7fSRyusuke Konishi goto failed; 6520f3e1c7fSRyusuke Konishi state = RF_INIT_ST; 6530f3e1c7fSRyusuke Konishi } 6540f3e1c7fSRyusuke Konishi break; /* Fall through to try_next_pseg */ 6550f3e1c7fSRyusuke Konishi } 6560f3e1c7fSRyusuke Konishi 6570f3e1c7fSRyusuke Konishi try_next_pseg: 6580f3e1c7fSRyusuke Konishi if (pseg_start == ri->ri_lsegs_end) 6590f3e1c7fSRyusuke Konishi break; 6600f3e1c7fSRyusuke Konishi pseg_start += ssi.nblocks; 6610f3e1c7fSRyusuke Konishi if (pseg_start < seg_end) 6620f3e1c7fSRyusuke Konishi continue; 6630f3e1c7fSRyusuke Konishi goto feed_segment; 6640f3e1c7fSRyusuke Konishi 6650f3e1c7fSRyusuke Konishi strayed: 6660f3e1c7fSRyusuke Konishi if (pseg_start == ri->ri_lsegs_end) 6670f3e1c7fSRyusuke Konishi break; 6680f3e1c7fSRyusuke Konishi 6690f3e1c7fSRyusuke Konishi feed_segment: 6700f3e1c7fSRyusuke Konishi /* Looking to the next full segment */ 6710f3e1c7fSRyusuke Konishi if (empty_seg++) 6720f3e1c7fSRyusuke Konishi break; 6730f3e1c7fSRyusuke Konishi seg_seq++; 6740f3e1c7fSRyusuke Konishi segnum = nextnum; 6750f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 6760f3e1c7fSRyusuke Konishi pseg_start = seg_start; 6770f3e1c7fSRyusuke Konishi } 6780f3e1c7fSRyusuke Konishi 6790f3e1c7fSRyusuke Konishi if (nsalvaged_blocks) { 6800f3e1c7fSRyusuke Konishi printk(KERN_INFO "NILFS (device %s): salvaged %lu blocks\n", 6810f3e1c7fSRyusuke Konishi sbi->s_super->s_id, nsalvaged_blocks); 6820f3e1c7fSRyusuke Konishi ri->ri_need_recovery = NILFS_RECOVERY_ROLLFORWARD_DONE; 6830f3e1c7fSRyusuke Konishi } 6840f3e1c7fSRyusuke Konishi out: 6850f3e1c7fSRyusuke Konishi dispose_recovery_list(&dsync_blocks); 6868b94025cSRyusuke Konishi nilfs_detach_writer(nilfs, sbi); 6870f3e1c7fSRyusuke Konishi return err; 6880f3e1c7fSRyusuke Konishi 6890f3e1c7fSRyusuke Konishi confused: 6900f3e1c7fSRyusuke Konishi err = -EINVAL; 6910f3e1c7fSRyusuke Konishi failed: 6920f3e1c7fSRyusuke Konishi printk(KERN_ERR 6930f3e1c7fSRyusuke Konishi "NILFS (device %s): Error roll-forwarding " 6940f3e1c7fSRyusuke Konishi "(err=%d, pseg block=%llu). ", 6950f3e1c7fSRyusuke Konishi sbi->s_super->s_id, err, (unsigned long long)pseg_start); 6960f3e1c7fSRyusuke Konishi goto out; 6970f3e1c7fSRyusuke Konishi } 6980f3e1c7fSRyusuke Konishi 6990f3e1c7fSRyusuke Konishi static void nilfs_finish_roll_forward(struct the_nilfs *nilfs, 7000f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 7010f3e1c7fSRyusuke Konishi { 7020f3e1c7fSRyusuke Konishi struct buffer_head *bh; 7030f3e1c7fSRyusuke Konishi int err; 7040f3e1c7fSRyusuke Konishi 7050f3e1c7fSRyusuke Konishi if (nilfs_get_segnum_of_block(nilfs, ri->ri_lsegs_start) != 7060f3e1c7fSRyusuke Konishi nilfs_get_segnum_of_block(nilfs, ri->ri_super_root)) 7070f3e1c7fSRyusuke Konishi return; 7080f3e1c7fSRyusuke Konishi 7098b94025cSRyusuke Konishi bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize); 7100f3e1c7fSRyusuke Konishi BUG_ON(!bh); 7110f3e1c7fSRyusuke Konishi memset(bh->b_data, 0, bh->b_size); 7120f3e1c7fSRyusuke Konishi set_buffer_dirty(bh); 7130f3e1c7fSRyusuke Konishi err = sync_dirty_buffer(bh); 7140f3e1c7fSRyusuke Konishi if (unlikely(err)) 7150f3e1c7fSRyusuke Konishi printk(KERN_WARNING 7160f3e1c7fSRyusuke Konishi "NILFS warning: buffer sync write failed during " 7170f3e1c7fSRyusuke Konishi "post-cleaning of recovery.\n"); 7180f3e1c7fSRyusuke Konishi brelse(bh); 7190f3e1c7fSRyusuke Konishi } 7200f3e1c7fSRyusuke Konishi 7210f3e1c7fSRyusuke Konishi /** 722aee5ce2fSRyusuke Konishi * nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint 723aee5ce2fSRyusuke Konishi * @nilfs: nilfs object 7240f3e1c7fSRyusuke Konishi * @sbi: nilfs_sb_info 7250f3e1c7fSRyusuke Konishi * @ri: pointer to a nilfs_recovery_info struct to store search results. 7260f3e1c7fSRyusuke Konishi * 7270f3e1c7fSRyusuke Konishi * Return Value: On success, 0 is returned. On error, one of the following 7280f3e1c7fSRyusuke Konishi * negative error code is returned. 7290f3e1c7fSRyusuke Konishi * 7300f3e1c7fSRyusuke Konishi * %-EINVAL - Inconsistent filesystem state. 7310f3e1c7fSRyusuke Konishi * 7320f3e1c7fSRyusuke Konishi * %-EIO - I/O error 7330f3e1c7fSRyusuke Konishi * 7340f3e1c7fSRyusuke Konishi * %-ENOSPC - No space left on device (only in a panic state). 7350f3e1c7fSRyusuke Konishi * 7360f3e1c7fSRyusuke Konishi * %-ERESTARTSYS - Interrupted. 7370f3e1c7fSRyusuke Konishi * 7380f3e1c7fSRyusuke Konishi * %-ENOMEM - Insufficient memory available. 7390f3e1c7fSRyusuke Konishi */ 740aee5ce2fSRyusuke Konishi int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, 7410f3e1c7fSRyusuke Konishi struct nilfs_sb_info *sbi, 7420f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 7430f3e1c7fSRyusuke Konishi { 7440f3e1c7fSRyusuke Konishi int err; 7450f3e1c7fSRyusuke Konishi 7460f3e1c7fSRyusuke Konishi if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0) 7470f3e1c7fSRyusuke Konishi return 0; 7480f3e1c7fSRyusuke Konishi 7490f3e1c7fSRyusuke Konishi err = nilfs_attach_checkpoint(sbi, ri->ri_cno); 7500f3e1c7fSRyusuke Konishi if (unlikely(err)) { 7510f3e1c7fSRyusuke Konishi printk(KERN_ERR 7520f3e1c7fSRyusuke Konishi "NILFS: error loading the latest checkpoint.\n"); 7530f3e1c7fSRyusuke Konishi return err; 7540f3e1c7fSRyusuke Konishi } 7550f3e1c7fSRyusuke Konishi 7560f3e1c7fSRyusuke Konishi err = nilfs_do_roll_forward(nilfs, sbi, ri); 7570f3e1c7fSRyusuke Konishi if (unlikely(err)) 7580f3e1c7fSRyusuke Konishi goto failed; 7590f3e1c7fSRyusuke Konishi 7600f3e1c7fSRyusuke Konishi if (ri->ri_need_recovery == NILFS_RECOVERY_ROLLFORWARD_DONE) { 76185c2a74fSRyusuke Konishi err = nilfs_prepare_segment_for_recovery(nilfs, sbi, ri); 7620f3e1c7fSRyusuke Konishi if (unlikely(err)) { 7630f3e1c7fSRyusuke Konishi printk(KERN_ERR "NILFS: Error preparing segments for " 7640f3e1c7fSRyusuke Konishi "recovery.\n"); 7650f3e1c7fSRyusuke Konishi goto failed; 7660f3e1c7fSRyusuke Konishi } 7670f3e1c7fSRyusuke Konishi 768cece5520SRyusuke Konishi err = nilfs_attach_segment_constructor(sbi); 7690f3e1c7fSRyusuke Konishi if (unlikely(err)) 7700f3e1c7fSRyusuke Konishi goto failed; 7710f3e1c7fSRyusuke Konishi 7720f3e1c7fSRyusuke Konishi set_nilfs_discontinued(nilfs); 7730f3e1c7fSRyusuke Konishi err = nilfs_construct_segment(sbi->s_super); 7740f3e1c7fSRyusuke Konishi nilfs_detach_segment_constructor(sbi); 7750f3e1c7fSRyusuke Konishi 7760f3e1c7fSRyusuke Konishi if (unlikely(err)) { 7770f3e1c7fSRyusuke Konishi printk(KERN_ERR "NILFS: Oops! recovery failed. " 7780f3e1c7fSRyusuke Konishi "(err=%d)\n", err); 7790f3e1c7fSRyusuke Konishi goto failed; 7800f3e1c7fSRyusuke Konishi } 7810f3e1c7fSRyusuke Konishi 7828b94025cSRyusuke Konishi nilfs_finish_roll_forward(nilfs, ri); 7830f3e1c7fSRyusuke Konishi } 7840f3e1c7fSRyusuke Konishi 7850f3e1c7fSRyusuke Konishi failed: 7860f3e1c7fSRyusuke Konishi nilfs_detach_checkpoint(sbi); 7870f3e1c7fSRyusuke Konishi return err; 7880f3e1c7fSRyusuke Konishi } 7890f3e1c7fSRyusuke Konishi 7900f3e1c7fSRyusuke Konishi /** 7910f3e1c7fSRyusuke Konishi * nilfs_search_super_root - search the latest valid super root 7920f3e1c7fSRyusuke Konishi * @nilfs: the_nilfs 7930f3e1c7fSRyusuke Konishi * @ri: pointer to a nilfs_recovery_info struct to store search results. 7940f3e1c7fSRyusuke Konishi * 7950f3e1c7fSRyusuke Konishi * nilfs_search_super_root() looks for the latest super-root from a partial 7960f3e1c7fSRyusuke Konishi * segment pointed by the superblock. It sets up struct the_nilfs through 7970f3e1c7fSRyusuke Konishi * this search. It fills nilfs_recovery_info (ri) required for recovery. 7980f3e1c7fSRyusuke Konishi * 7990f3e1c7fSRyusuke Konishi * Return Value: On success, 0 is returned. On error, one of the following 8000f3e1c7fSRyusuke Konishi * negative error code is returned. 8010f3e1c7fSRyusuke Konishi * 8020f3e1c7fSRyusuke Konishi * %-EINVAL - No valid segment found 8030f3e1c7fSRyusuke Konishi * 8040f3e1c7fSRyusuke Konishi * %-EIO - I/O error 8050f3e1c7fSRyusuke Konishi */ 8068b94025cSRyusuke Konishi int nilfs_search_super_root(struct the_nilfs *nilfs, 8070f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 8080f3e1c7fSRyusuke Konishi { 8090f3e1c7fSRyusuke Konishi struct nilfs_segsum_info ssi; 8100f3e1c7fSRyusuke Konishi sector_t pseg_start, pseg_end, sr_pseg_start = 0; 8110f3e1c7fSRyusuke Konishi sector_t seg_start, seg_end; /* range of full segment (block number) */ 812050b4142SRyusuke Konishi sector_t b, end; 8130f3e1c7fSRyusuke Konishi u64 seg_seq; 8140f3e1c7fSRyusuke Konishi __u64 segnum, nextnum = 0; 8150f3e1c7fSRyusuke Konishi __u64 cno; 8160f3e1c7fSRyusuke Konishi LIST_HEAD(segments); 8170f3e1c7fSRyusuke Konishi int empty_seg = 0, scan_newer = 0; 8180f3e1c7fSRyusuke Konishi int ret; 8190f3e1c7fSRyusuke Konishi 8200f3e1c7fSRyusuke Konishi pseg_start = nilfs->ns_last_pseg; 8210f3e1c7fSRyusuke Konishi seg_seq = nilfs->ns_last_seq; 8220f3e1c7fSRyusuke Konishi cno = nilfs->ns_last_cno; 8230f3e1c7fSRyusuke Konishi segnum = nilfs_get_segnum_of_block(nilfs, pseg_start); 8240f3e1c7fSRyusuke Konishi 8250f3e1c7fSRyusuke Konishi /* Calculate range of segment */ 8260f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 8270f3e1c7fSRyusuke Konishi 828050b4142SRyusuke Konishi /* Read ahead segment */ 829050b4142SRyusuke Konishi b = seg_start; 830050b4142SRyusuke Konishi while (b <= seg_end) 8318b94025cSRyusuke Konishi __breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize); 832050b4142SRyusuke Konishi 8330f3e1c7fSRyusuke Konishi for (;;) { 8348b94025cSRyusuke Konishi ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi); 8350f3e1c7fSRyusuke Konishi if (ret) { 8360f3e1c7fSRyusuke Konishi if (ret == NILFS_SEG_FAIL_IO) 8370f3e1c7fSRyusuke Konishi goto failed; 8380f3e1c7fSRyusuke Konishi goto strayed; 8390f3e1c7fSRyusuke Konishi } 8400f3e1c7fSRyusuke Konishi pseg_end = pseg_start + ssi.nblocks - 1; 8410f3e1c7fSRyusuke Konishi if (unlikely(pseg_end > seg_end)) { 8420f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CONSISTENCY; 8430f3e1c7fSRyusuke Konishi goto strayed; 8440f3e1c7fSRyusuke Konishi } 8450f3e1c7fSRyusuke Konishi 8460f3e1c7fSRyusuke Konishi /* A valid partial segment */ 8470f3e1c7fSRyusuke Konishi ri->ri_pseg_start = pseg_start; 8480f3e1c7fSRyusuke Konishi ri->ri_seq = seg_seq; 8490f3e1c7fSRyusuke Konishi ri->ri_segnum = segnum; 8500f3e1c7fSRyusuke Konishi nextnum = nilfs_get_segnum_of_block(nilfs, ssi.next); 8510f3e1c7fSRyusuke Konishi ri->ri_nextnum = nextnum; 8520f3e1c7fSRyusuke Konishi empty_seg = 0; 8530f3e1c7fSRyusuke Konishi 854050b4142SRyusuke Konishi if (!NILFS_SEG_HAS_SR(&ssi) && !scan_newer) { 8550f3e1c7fSRyusuke Konishi /* This will never happen because a superblock 8560f3e1c7fSRyusuke Konishi (last_segment) always points to a pseg 8570f3e1c7fSRyusuke Konishi having a super root. */ 8580f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CONSISTENCY; 8590f3e1c7fSRyusuke Konishi goto failed; 8600f3e1c7fSRyusuke Konishi } 861050b4142SRyusuke Konishi 862050b4142SRyusuke Konishi if (pseg_start == seg_start) { 863050b4142SRyusuke Konishi nilfs_get_segment_range(nilfs, nextnum, &b, &end); 864050b4142SRyusuke Konishi while (b <= end) 8658b94025cSRyusuke Konishi __breadahead(nilfs->ns_bdev, b++, 8668b94025cSRyusuke Konishi nilfs->ns_blocksize); 867050b4142SRyusuke Konishi } 868050b4142SRyusuke Konishi if (!NILFS_SEG_HAS_SR(&ssi)) { 8690f3e1c7fSRyusuke Konishi if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) { 8700f3e1c7fSRyusuke Konishi ri->ri_lsegs_start = pseg_start; 8710f3e1c7fSRyusuke Konishi ri->ri_lsegs_start_seq = seg_seq; 8720f3e1c7fSRyusuke Konishi } 8730f3e1c7fSRyusuke Konishi if (NILFS_SEG_LOGEND(&ssi)) 8740f3e1c7fSRyusuke Konishi ri->ri_lsegs_end = pseg_start; 8750f3e1c7fSRyusuke Konishi goto try_next_pseg; 8760f3e1c7fSRyusuke Konishi } 8770f3e1c7fSRyusuke Konishi 8780f3e1c7fSRyusuke Konishi /* A valid super root was found. */ 8790f3e1c7fSRyusuke Konishi ri->ri_cno = cno++; 8800f3e1c7fSRyusuke Konishi ri->ri_super_root = pseg_end; 8810f3e1c7fSRyusuke Konishi ri->ri_lsegs_start = ri->ri_lsegs_end = 0; 8820f3e1c7fSRyusuke Konishi 8830f3e1c7fSRyusuke Konishi nilfs_dispose_segment_list(&segments); 8840f3e1c7fSRyusuke Konishi nilfs->ns_pseg_offset = (sr_pseg_start = pseg_start) 8850f3e1c7fSRyusuke Konishi + ssi.nblocks - seg_start; 8860f3e1c7fSRyusuke Konishi nilfs->ns_seg_seq = seg_seq; 8870f3e1c7fSRyusuke Konishi nilfs->ns_segnum = segnum; 8880f3e1c7fSRyusuke Konishi nilfs->ns_cno = cno; /* nilfs->ns_cno = ri->ri_cno + 1 */ 8890f3e1c7fSRyusuke Konishi nilfs->ns_ctime = ssi.ctime; 8900f3e1c7fSRyusuke Konishi nilfs->ns_nextnum = nextnum; 8910f3e1c7fSRyusuke Konishi 8920f3e1c7fSRyusuke Konishi if (scan_newer) 8930f3e1c7fSRyusuke Konishi ri->ri_need_recovery = NILFS_RECOVERY_SR_UPDATED; 8942c2e52fcSRyusuke Konishi else { 8952c2e52fcSRyusuke Konishi if (nilfs->ns_mount_state & NILFS_VALID_FS) 8960f3e1c7fSRyusuke Konishi goto super_root_found; 8970f3e1c7fSRyusuke Konishi scan_newer = 1; 8982c2e52fcSRyusuke Konishi } 8990f3e1c7fSRyusuke Konishi 9000f3e1c7fSRyusuke Konishi /* reset region for roll-forward */ 9010f3e1c7fSRyusuke Konishi pseg_start += ssi.nblocks; 9020f3e1c7fSRyusuke Konishi if (pseg_start < seg_end) 9030f3e1c7fSRyusuke Konishi continue; 9040f3e1c7fSRyusuke Konishi goto feed_segment; 9050f3e1c7fSRyusuke Konishi 9060f3e1c7fSRyusuke Konishi try_next_pseg: 9070f3e1c7fSRyusuke Konishi /* Standing on a course, or met an inconsistent state */ 9080f3e1c7fSRyusuke Konishi pseg_start += ssi.nblocks; 9090f3e1c7fSRyusuke Konishi if (pseg_start < seg_end) 9100f3e1c7fSRyusuke Konishi continue; 9110f3e1c7fSRyusuke Konishi goto feed_segment; 9120f3e1c7fSRyusuke Konishi 9130f3e1c7fSRyusuke Konishi strayed: 9140f3e1c7fSRyusuke Konishi /* Off the trail */ 9150f3e1c7fSRyusuke Konishi if (!scan_newer) 9160f3e1c7fSRyusuke Konishi /* 9170f3e1c7fSRyusuke Konishi * This can happen if a checkpoint was written without 9180f3e1c7fSRyusuke Konishi * barriers, or as a result of an I/O failure. 9190f3e1c7fSRyusuke Konishi */ 9200f3e1c7fSRyusuke Konishi goto failed; 9210f3e1c7fSRyusuke Konishi 9220f3e1c7fSRyusuke Konishi feed_segment: 9230f3e1c7fSRyusuke Konishi /* Looking to the next full segment */ 9240f3e1c7fSRyusuke Konishi if (empty_seg++) 9250f3e1c7fSRyusuke Konishi goto super_root_found; /* found a valid super root */ 9260f3e1c7fSRyusuke Konishi 927654137ddSRyusuke Konishi ret = nilfs_segment_list_add(&segments, segnum); 928654137ddSRyusuke Konishi if (unlikely(ret)) 9290f3e1c7fSRyusuke Konishi goto failed; 9300f3e1c7fSRyusuke Konishi 9310f3e1c7fSRyusuke Konishi seg_seq++; 9320f3e1c7fSRyusuke Konishi segnum = nextnum; 9330f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 9340f3e1c7fSRyusuke Konishi pseg_start = seg_start; 9350f3e1c7fSRyusuke Konishi } 9360f3e1c7fSRyusuke Konishi 9370f3e1c7fSRyusuke Konishi super_root_found: 9380f3e1c7fSRyusuke Konishi /* Updating pointers relating to the latest checkpoint */ 9390935db74SRyusuke Konishi list_splice_tail(&segments, &ri->ri_used_segments); 9400f3e1c7fSRyusuke Konishi nilfs->ns_last_pseg = sr_pseg_start; 9410f3e1c7fSRyusuke Konishi nilfs->ns_last_seq = nilfs->ns_seg_seq; 9420f3e1c7fSRyusuke Konishi nilfs->ns_last_cno = ri->ri_cno; 9430f3e1c7fSRyusuke Konishi return 0; 9440f3e1c7fSRyusuke Konishi 9450f3e1c7fSRyusuke Konishi failed: 9460f3e1c7fSRyusuke Konishi nilfs_dispose_segment_list(&segments); 9470f3e1c7fSRyusuke Konishi return (ret < 0) ? ret : nilfs_warn_segment_error(ret); 9480f3e1c7fSRyusuke Konishi } 949