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 * 164b420ab4SRyusuke Konishi * Written by Ryusuke Konishi. 170f3e1c7fSRyusuke Konishi */ 180f3e1c7fSRyusuke Konishi 190f3e1c7fSRyusuke Konishi #include <linux/buffer_head.h> 200f3e1c7fSRyusuke Konishi #include <linux/blkdev.h> 210f3e1c7fSRyusuke Konishi #include <linux/swap.h> 225a0e3ad6STejun Heo #include <linux/slab.h> 230f3e1c7fSRyusuke Konishi #include <linux/crc32.h> 240f3e1c7fSRyusuke Konishi #include "nilfs.h" 250f3e1c7fSRyusuke Konishi #include "segment.h" 260f3e1c7fSRyusuke Konishi #include "sufile.h" 270f3e1c7fSRyusuke Konishi #include "page.h" 280f3e1c7fSRyusuke Konishi #include "segbuf.h" 290f3e1c7fSRyusuke Konishi 300f3e1c7fSRyusuke Konishi /* 310f3e1c7fSRyusuke Konishi * Segment check result 320f3e1c7fSRyusuke Konishi */ 330f3e1c7fSRyusuke Konishi enum { 340f3e1c7fSRyusuke Konishi NILFS_SEG_VALID, 350f3e1c7fSRyusuke Konishi NILFS_SEG_NO_SUPER_ROOT, 360f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_IO, 370f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_MAGIC, 380f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_SEQ, 390f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT, 400f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_CHECKSUM_FULL, 410f3e1c7fSRyusuke Konishi NILFS_SEG_FAIL_CONSISTENCY, 420f3e1c7fSRyusuke Konishi }; 430f3e1c7fSRyusuke Konishi 440f3e1c7fSRyusuke Konishi /* work structure for recovery */ 450f3e1c7fSRyusuke Konishi struct nilfs_recovery_block { 460f3e1c7fSRyusuke Konishi ino_t ino; /* Inode number of the file that this block 470f3e1c7fSRyusuke Konishi belongs to */ 480f3e1c7fSRyusuke Konishi sector_t blocknr; /* block number */ 490f3e1c7fSRyusuke Konishi __u64 vblocknr; /* virtual block number */ 500f3e1c7fSRyusuke Konishi unsigned long blkoff; /* File offset of the data block (per block) */ 510f3e1c7fSRyusuke Konishi struct list_head list; 520f3e1c7fSRyusuke Konishi }; 530f3e1c7fSRyusuke Konishi 540f3e1c7fSRyusuke Konishi 550f3e1c7fSRyusuke Konishi static int nilfs_warn_segment_error(int err) 560f3e1c7fSRyusuke Konishi { 570f3e1c7fSRyusuke Konishi switch (err) { 580f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_IO: 590f3e1c7fSRyusuke Konishi printk(KERN_WARNING 600f3e1c7fSRyusuke Konishi "NILFS warning: I/O error on loading last segment\n"); 610f3e1c7fSRyusuke Konishi return -EIO; 620f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_MAGIC: 630f3e1c7fSRyusuke Konishi printk(KERN_WARNING 640f3e1c7fSRyusuke Konishi "NILFS warning: Segment magic number invalid\n"); 650f3e1c7fSRyusuke Konishi break; 660f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_SEQ: 670f3e1c7fSRyusuke Konishi printk(KERN_WARNING 680f3e1c7fSRyusuke Konishi "NILFS warning: Sequence number mismatch\n"); 690f3e1c7fSRyusuke Konishi break; 700f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT: 710f3e1c7fSRyusuke Konishi printk(KERN_WARNING 720f3e1c7fSRyusuke Konishi "NILFS warning: Checksum error in super root\n"); 730f3e1c7fSRyusuke Konishi break; 740f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_CHECKSUM_FULL: 750f3e1c7fSRyusuke Konishi printk(KERN_WARNING 760f3e1c7fSRyusuke Konishi "NILFS warning: Checksum error in segment payload\n"); 770f3e1c7fSRyusuke Konishi break; 780f3e1c7fSRyusuke Konishi case NILFS_SEG_FAIL_CONSISTENCY: 790f3e1c7fSRyusuke Konishi printk(KERN_WARNING 800f3e1c7fSRyusuke Konishi "NILFS warning: Inconsistent segment\n"); 810f3e1c7fSRyusuke Konishi break; 820f3e1c7fSRyusuke Konishi case NILFS_SEG_NO_SUPER_ROOT: 830f3e1c7fSRyusuke Konishi printk(KERN_WARNING 840f3e1c7fSRyusuke Konishi "NILFS warning: No super root in the last segment\n"); 850f3e1c7fSRyusuke Konishi break; 860f3e1c7fSRyusuke Konishi } 870f3e1c7fSRyusuke Konishi return -EINVAL; 880f3e1c7fSRyusuke Konishi } 890f3e1c7fSRyusuke Konishi 900f3e1c7fSRyusuke Konishi /** 918b94025cSRyusuke Konishi * nilfs_compute_checksum - compute checksum of blocks continuously 928b94025cSRyusuke Konishi * @nilfs: nilfs object 930f3e1c7fSRyusuke Konishi * @bhs: buffer head of start block 940f3e1c7fSRyusuke Konishi * @sum: place to store result 950f3e1c7fSRyusuke Konishi * @offset: offset bytes in the first block 960f3e1c7fSRyusuke Konishi * @check_bytes: number of bytes to be checked 970f3e1c7fSRyusuke Konishi * @start: DBN of start block 980f3e1c7fSRyusuke Konishi * @nblock: number of blocks to be checked 990f3e1c7fSRyusuke Konishi */ 1008b94025cSRyusuke Konishi static int nilfs_compute_checksum(struct the_nilfs *nilfs, 1018b94025cSRyusuke Konishi struct buffer_head *bhs, u32 *sum, 1028b94025cSRyusuke Konishi unsigned long offset, u64 check_bytes, 1030f3e1c7fSRyusuke Konishi sector_t start, unsigned long nblock) 1040f3e1c7fSRyusuke Konishi { 1058b94025cSRyusuke Konishi unsigned int blocksize = nilfs->ns_blocksize; 1060f3e1c7fSRyusuke Konishi unsigned long size; 1070f3e1c7fSRyusuke Konishi u32 crc; 1080f3e1c7fSRyusuke Konishi 1090f3e1c7fSRyusuke Konishi BUG_ON(offset >= blocksize); 1100f3e1c7fSRyusuke Konishi check_bytes -= offset; 1110f3e1c7fSRyusuke Konishi size = min_t(u64, check_bytes, blocksize - offset); 1128b94025cSRyusuke Konishi crc = crc32_le(nilfs->ns_crc_seed, 1130f3e1c7fSRyusuke Konishi (unsigned char *)bhs->b_data + offset, size); 1140f3e1c7fSRyusuke Konishi if (--nblock > 0) { 1150f3e1c7fSRyusuke Konishi do { 1168b94025cSRyusuke Konishi struct buffer_head *bh; 1178b94025cSRyusuke Konishi 1188b94025cSRyusuke Konishi bh = __bread(nilfs->ns_bdev, ++start, blocksize); 1190f3e1c7fSRyusuke Konishi if (!bh) 1200f3e1c7fSRyusuke Konishi return -EIO; 1210f3e1c7fSRyusuke Konishi check_bytes -= size; 1220f3e1c7fSRyusuke Konishi size = min_t(u64, check_bytes, blocksize); 1230f3e1c7fSRyusuke Konishi crc = crc32_le(crc, bh->b_data, size); 1240f3e1c7fSRyusuke Konishi brelse(bh); 1250f3e1c7fSRyusuke Konishi } while (--nblock > 0); 1260f3e1c7fSRyusuke Konishi } 1270f3e1c7fSRyusuke Konishi *sum = crc; 1280f3e1c7fSRyusuke Konishi return 0; 1290f3e1c7fSRyusuke Konishi } 1300f3e1c7fSRyusuke Konishi 1310f3e1c7fSRyusuke Konishi /** 1320f3e1c7fSRyusuke Konishi * nilfs_read_super_root_block - read super root block 1338b94025cSRyusuke Konishi * @nilfs: nilfs object 1340f3e1c7fSRyusuke Konishi * @sr_block: disk block number of the super root block 1350f3e1c7fSRyusuke Konishi * @pbh: address of a buffer_head pointer to return super root buffer 1360f3e1c7fSRyusuke Konishi * @check: CRC check flag 1370f3e1c7fSRyusuke Konishi */ 1388b94025cSRyusuke Konishi int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block, 1390f3e1c7fSRyusuke Konishi struct buffer_head **pbh, int check) 1400f3e1c7fSRyusuke Konishi { 1410f3e1c7fSRyusuke Konishi struct buffer_head *bh_sr; 1420f3e1c7fSRyusuke Konishi struct nilfs_super_root *sr; 1430f3e1c7fSRyusuke Konishi u32 crc; 1440f3e1c7fSRyusuke Konishi int ret; 1450f3e1c7fSRyusuke Konishi 1460f3e1c7fSRyusuke Konishi *pbh = NULL; 1478b94025cSRyusuke Konishi bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize); 1480f3e1c7fSRyusuke Konishi if (unlikely(!bh_sr)) { 1490f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 1500f3e1c7fSRyusuke Konishi goto failed; 1510f3e1c7fSRyusuke Konishi } 1520f3e1c7fSRyusuke Konishi 1530f3e1c7fSRyusuke Konishi sr = (struct nilfs_super_root *)bh_sr->b_data; 1540f3e1c7fSRyusuke Konishi if (check) { 1550c6c44cbSRyusuke Konishi unsigned int bytes = le16_to_cpu(sr->sr_bytes); 1560f3e1c7fSRyusuke Konishi 1578b94025cSRyusuke Konishi if (bytes == 0 || bytes > nilfs->ns_blocksize) { 1580f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT; 1590f3e1c7fSRyusuke Konishi goto failed_bh; 1600f3e1c7fSRyusuke Konishi } 1618b94025cSRyusuke Konishi if (nilfs_compute_checksum( 1628b94025cSRyusuke Konishi nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes, 1638b94025cSRyusuke Konishi sr_block, 1)) { 1640f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 1650f3e1c7fSRyusuke Konishi goto failed_bh; 1660f3e1c7fSRyusuke Konishi } 1670f3e1c7fSRyusuke Konishi if (crc != le32_to_cpu(sr->sr_sum)) { 1680f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT; 1690f3e1c7fSRyusuke Konishi goto failed_bh; 1700f3e1c7fSRyusuke Konishi } 1710f3e1c7fSRyusuke Konishi } 1720f3e1c7fSRyusuke Konishi *pbh = bh_sr; 1730f3e1c7fSRyusuke Konishi return 0; 1740f3e1c7fSRyusuke Konishi 1750f3e1c7fSRyusuke Konishi failed_bh: 1760f3e1c7fSRyusuke Konishi brelse(bh_sr); 1770f3e1c7fSRyusuke Konishi 1780f3e1c7fSRyusuke Konishi failed: 1790f3e1c7fSRyusuke Konishi return nilfs_warn_segment_error(ret); 1800f3e1c7fSRyusuke Konishi } 1810f3e1c7fSRyusuke Konishi 1820f3e1c7fSRyusuke Konishi /** 183354fa8beSRyusuke Konishi * nilfs_read_log_header - read summary header of the specified log 1848b94025cSRyusuke Konishi * @nilfs: nilfs object 185354fa8beSRyusuke Konishi * @start_blocknr: start block number of the log 186354fa8beSRyusuke Konishi * @sum: pointer to return segment summary structure 1870f3e1c7fSRyusuke Konishi */ 188354fa8beSRyusuke Konishi static struct buffer_head * 189354fa8beSRyusuke Konishi nilfs_read_log_header(struct the_nilfs *nilfs, sector_t start_blocknr, 190354fa8beSRyusuke Konishi struct nilfs_segment_summary **sum) 1910f3e1c7fSRyusuke Konishi { 1920f3e1c7fSRyusuke Konishi struct buffer_head *bh_sum; 193354fa8beSRyusuke Konishi 194354fa8beSRyusuke Konishi bh_sum = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize); 195354fa8beSRyusuke Konishi if (bh_sum) 196354fa8beSRyusuke Konishi *sum = (struct nilfs_segment_summary *)bh_sum->b_data; 197354fa8beSRyusuke Konishi return bh_sum; 198354fa8beSRyusuke Konishi } 199354fa8beSRyusuke Konishi 200354fa8beSRyusuke Konishi /** 201354fa8beSRyusuke Konishi * nilfs_validate_log - verify consistency of log 202354fa8beSRyusuke Konishi * @nilfs: nilfs object 203354fa8beSRyusuke Konishi * @seg_seq: sequence number of segment 204354fa8beSRyusuke Konishi * @bh_sum: buffer head of summary block 205354fa8beSRyusuke Konishi * @sum: segment summary struct 206354fa8beSRyusuke Konishi */ 207354fa8beSRyusuke Konishi static int nilfs_validate_log(struct the_nilfs *nilfs, u64 seg_seq, 208354fa8beSRyusuke Konishi struct buffer_head *bh_sum, 209354fa8beSRyusuke Konishi struct nilfs_segment_summary *sum) 210354fa8beSRyusuke Konishi { 21103f29365SJiro SEKIBA unsigned long nblock; 21203f29365SJiro SEKIBA u32 crc; 213354fa8beSRyusuke Konishi int ret; 2140f3e1c7fSRyusuke Konishi 215354fa8beSRyusuke Konishi ret = NILFS_SEG_FAIL_MAGIC; 216354fa8beSRyusuke Konishi if (le32_to_cpu(sum->ss_magic) != NILFS_SEGSUM_MAGIC) 2170f3e1c7fSRyusuke Konishi goto out; 2180f3e1c7fSRyusuke Konishi 2190f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_SEQ; 220354fa8beSRyusuke Konishi if (le64_to_cpu(sum->ss_seq) != seg_seq) 221354fa8beSRyusuke Konishi goto out; 2220f3e1c7fSRyusuke Konishi 223354fa8beSRyusuke Konishi nblock = le32_to_cpu(sum->ss_nblocks); 2240f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CONSISTENCY; 225354fa8beSRyusuke Konishi if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment)) 226354fa8beSRyusuke Konishi /* This limits the number of blocks read in the CRC check */ 227354fa8beSRyusuke Konishi goto out; 228354fa8beSRyusuke Konishi 229354fa8beSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 2308b94025cSRyusuke Konishi if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum), 2318b94025cSRyusuke Konishi ((u64)nblock << nilfs->ns_blocksize_bits), 232354fa8beSRyusuke Konishi bh_sum->b_blocknr, nblock)) 233354fa8beSRyusuke Konishi goto out; 234354fa8beSRyusuke Konishi 23503f29365SJiro SEKIBA ret = NILFS_SEG_FAIL_CHECKSUM_FULL; 236354fa8beSRyusuke Konishi if (crc != le32_to_cpu(sum->ss_datasum)) 237354fa8beSRyusuke Konishi goto out; 238354fa8beSRyusuke Konishi ret = 0; 2390f3e1c7fSRyusuke Konishi out: 2400f3e1c7fSRyusuke Konishi return ret; 2410f3e1c7fSRyusuke Konishi } 2420f3e1c7fSRyusuke Konishi 2438b94025cSRyusuke Konishi /** 2448b94025cSRyusuke Konishi * nilfs_read_summary_info - read an item on summary blocks of a log 2458b94025cSRyusuke Konishi * @nilfs: nilfs object 2468b94025cSRyusuke Konishi * @pbh: the current buffer head on summary blocks [in, out] 2478b94025cSRyusuke Konishi * @offset: the current byte offset on summary blocks [in, out] 2488b94025cSRyusuke Konishi * @bytes: byte size of the item to be read 2498b94025cSRyusuke Konishi */ 2508b94025cSRyusuke Konishi static void *nilfs_read_summary_info(struct the_nilfs *nilfs, 2518b94025cSRyusuke Konishi struct buffer_head **pbh, 2520f3e1c7fSRyusuke Konishi unsigned int *offset, unsigned int bytes) 2530f3e1c7fSRyusuke Konishi { 2540f3e1c7fSRyusuke Konishi void *ptr; 2550f3e1c7fSRyusuke Konishi sector_t blocknr; 2560f3e1c7fSRyusuke Konishi 2570f3e1c7fSRyusuke Konishi BUG_ON((*pbh)->b_size < *offset); 2580f3e1c7fSRyusuke Konishi if (bytes > (*pbh)->b_size - *offset) { 2590f3e1c7fSRyusuke Konishi blocknr = (*pbh)->b_blocknr; 2600f3e1c7fSRyusuke Konishi brelse(*pbh); 2618b94025cSRyusuke Konishi *pbh = __bread(nilfs->ns_bdev, blocknr + 1, 2628b94025cSRyusuke Konishi nilfs->ns_blocksize); 2630f3e1c7fSRyusuke Konishi if (unlikely(!*pbh)) 2640f3e1c7fSRyusuke Konishi return NULL; 2650f3e1c7fSRyusuke Konishi *offset = 0; 2660f3e1c7fSRyusuke Konishi } 2670f3e1c7fSRyusuke Konishi ptr = (*pbh)->b_data + *offset; 2680f3e1c7fSRyusuke Konishi *offset += bytes; 2690f3e1c7fSRyusuke Konishi return ptr; 2700f3e1c7fSRyusuke Konishi } 2710f3e1c7fSRyusuke Konishi 2728b94025cSRyusuke Konishi /** 2738b94025cSRyusuke Konishi * nilfs_skip_summary_info - skip items on summary blocks of a log 2748b94025cSRyusuke Konishi * @nilfs: nilfs object 2758b94025cSRyusuke Konishi * @pbh: the current buffer head on summary blocks [in, out] 2768b94025cSRyusuke Konishi * @offset: the current byte offset on summary blocks [in, out] 2778b94025cSRyusuke Konishi * @bytes: byte size of the item to be skipped 2788b94025cSRyusuke Konishi * @count: number of items to be skipped 2798b94025cSRyusuke Konishi */ 2808b94025cSRyusuke Konishi static void nilfs_skip_summary_info(struct the_nilfs *nilfs, 2818b94025cSRyusuke Konishi struct buffer_head **pbh, 2820f3e1c7fSRyusuke Konishi unsigned int *offset, unsigned int bytes, 2830f3e1c7fSRyusuke Konishi unsigned long count) 2840f3e1c7fSRyusuke Konishi { 2850f3e1c7fSRyusuke Konishi unsigned int rest_item_in_current_block 2860f3e1c7fSRyusuke Konishi = ((*pbh)->b_size - *offset) / bytes; 2870f3e1c7fSRyusuke Konishi 2880f3e1c7fSRyusuke Konishi if (count <= rest_item_in_current_block) { 2890f3e1c7fSRyusuke Konishi *offset += bytes * count; 2900f3e1c7fSRyusuke Konishi } else { 2910f3e1c7fSRyusuke Konishi sector_t blocknr = (*pbh)->b_blocknr; 2920f3e1c7fSRyusuke Konishi unsigned int nitem_per_block = (*pbh)->b_size / bytes; 2930f3e1c7fSRyusuke Konishi unsigned int bcnt; 2940f3e1c7fSRyusuke Konishi 2950f3e1c7fSRyusuke Konishi count -= rest_item_in_current_block; 2960f3e1c7fSRyusuke Konishi bcnt = DIV_ROUND_UP(count, nitem_per_block); 2970f3e1c7fSRyusuke Konishi *offset = bytes * (count - (bcnt - 1) * nitem_per_block); 2980f3e1c7fSRyusuke Konishi 2990f3e1c7fSRyusuke Konishi brelse(*pbh); 3008b94025cSRyusuke Konishi *pbh = __bread(nilfs->ns_bdev, blocknr + bcnt, 3018b94025cSRyusuke Konishi nilfs->ns_blocksize); 3020f3e1c7fSRyusuke Konishi } 3030f3e1c7fSRyusuke Konishi } 3040f3e1c7fSRyusuke Konishi 3058b94025cSRyusuke Konishi /** 3068b94025cSRyusuke Konishi * nilfs_scan_dsync_log - get block information of a log written for data sync 3078b94025cSRyusuke Konishi * @nilfs: nilfs object 3088b94025cSRyusuke Konishi * @start_blocknr: start block number of the log 30985655484SRyusuke Konishi * @sum: log summary information 3108b94025cSRyusuke Konishi * @head: list head to add nilfs_recovery_block struct 3118b94025cSRyusuke Konishi */ 3128b94025cSRyusuke Konishi static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr, 31385655484SRyusuke Konishi struct nilfs_segment_summary *sum, 3140f3e1c7fSRyusuke Konishi struct list_head *head) 3150f3e1c7fSRyusuke Konishi { 3160f3e1c7fSRyusuke Konishi struct buffer_head *bh; 3170f3e1c7fSRyusuke Konishi unsigned int offset; 31885655484SRyusuke Konishi u32 nfinfo, sumbytes; 31985655484SRyusuke Konishi sector_t blocknr; 3200f3e1c7fSRyusuke Konishi ino_t ino; 3210f3e1c7fSRyusuke Konishi int err = -EIO; 3220f3e1c7fSRyusuke Konishi 32385655484SRyusuke Konishi nfinfo = le32_to_cpu(sum->ss_nfinfo); 3240f3e1c7fSRyusuke Konishi if (!nfinfo) 3250f3e1c7fSRyusuke Konishi return 0; 3260f3e1c7fSRyusuke Konishi 32785655484SRyusuke Konishi sumbytes = le32_to_cpu(sum->ss_sumbytes); 32885655484SRyusuke Konishi blocknr = start_blocknr + DIV_ROUND_UP(sumbytes, nilfs->ns_blocksize); 3298b94025cSRyusuke Konishi bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize); 3300f3e1c7fSRyusuke Konishi if (unlikely(!bh)) 3310f3e1c7fSRyusuke Konishi goto out; 3320f3e1c7fSRyusuke Konishi 33385655484SRyusuke Konishi offset = le16_to_cpu(sum->ss_bytes); 3340f3e1c7fSRyusuke Konishi for (;;) { 3350f3e1c7fSRyusuke Konishi unsigned long nblocks, ndatablk, nnodeblk; 3360f3e1c7fSRyusuke Konishi struct nilfs_finfo *finfo; 3370f3e1c7fSRyusuke Konishi 3388b94025cSRyusuke Konishi finfo = nilfs_read_summary_info(nilfs, &bh, &offset, 3398b94025cSRyusuke Konishi sizeof(*finfo)); 3400f3e1c7fSRyusuke Konishi if (unlikely(!finfo)) 3410f3e1c7fSRyusuke Konishi goto out; 3420f3e1c7fSRyusuke Konishi 3430f3e1c7fSRyusuke Konishi ino = le64_to_cpu(finfo->fi_ino); 3440f3e1c7fSRyusuke Konishi nblocks = le32_to_cpu(finfo->fi_nblocks); 3450f3e1c7fSRyusuke Konishi ndatablk = le32_to_cpu(finfo->fi_ndatablk); 3460f3e1c7fSRyusuke Konishi nnodeblk = nblocks - ndatablk; 3470f3e1c7fSRyusuke Konishi 3480f3e1c7fSRyusuke Konishi while (ndatablk-- > 0) { 3490f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb; 3500f3e1c7fSRyusuke Konishi struct nilfs_binfo_v *binfo; 3510f3e1c7fSRyusuke Konishi 3528b94025cSRyusuke Konishi binfo = nilfs_read_summary_info(nilfs, &bh, &offset, 3530f3e1c7fSRyusuke Konishi sizeof(*binfo)); 3540f3e1c7fSRyusuke Konishi if (unlikely(!binfo)) 3550f3e1c7fSRyusuke Konishi goto out; 3560f3e1c7fSRyusuke Konishi 3570f3e1c7fSRyusuke Konishi rb = kmalloc(sizeof(*rb), GFP_NOFS); 3580f3e1c7fSRyusuke Konishi if (unlikely(!rb)) { 3590f3e1c7fSRyusuke Konishi err = -ENOMEM; 3600f3e1c7fSRyusuke Konishi goto out; 3610f3e1c7fSRyusuke Konishi } 3620f3e1c7fSRyusuke Konishi rb->ino = ino; 3630f3e1c7fSRyusuke Konishi rb->blocknr = blocknr++; 3640f3e1c7fSRyusuke Konishi rb->vblocknr = le64_to_cpu(binfo->bi_vblocknr); 3650f3e1c7fSRyusuke Konishi rb->blkoff = le64_to_cpu(binfo->bi_blkoff); 3660f3e1c7fSRyusuke Konishi /* INIT_LIST_HEAD(&rb->list); */ 3670f3e1c7fSRyusuke Konishi list_add_tail(&rb->list, head); 3680f3e1c7fSRyusuke Konishi } 3690f3e1c7fSRyusuke Konishi if (--nfinfo == 0) 3700f3e1c7fSRyusuke Konishi break; 3718b94025cSRyusuke Konishi blocknr += nnodeblk; /* always 0 for data sync logs */ 3728b94025cSRyusuke Konishi nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64), 3730f3e1c7fSRyusuke Konishi nnodeblk); 3740f3e1c7fSRyusuke Konishi if (unlikely(!bh)) 3750f3e1c7fSRyusuke Konishi goto out; 3760f3e1c7fSRyusuke Konishi } 3770f3e1c7fSRyusuke Konishi err = 0; 3780f3e1c7fSRyusuke Konishi out: 3790f3e1c7fSRyusuke Konishi brelse(bh); /* brelse(NULL) is just ignored */ 3800f3e1c7fSRyusuke Konishi return err; 3810f3e1c7fSRyusuke Konishi } 3820f3e1c7fSRyusuke Konishi 3830f3e1c7fSRyusuke Konishi static void dispose_recovery_list(struct list_head *head) 3840f3e1c7fSRyusuke Konishi { 3850f3e1c7fSRyusuke Konishi while (!list_empty(head)) { 3860cc12838SRyusuke Konishi struct nilfs_recovery_block *rb; 3870cc12838SRyusuke Konishi 3880cc12838SRyusuke Konishi rb = list_first_entry(head, struct nilfs_recovery_block, list); 3890f3e1c7fSRyusuke Konishi list_del(&rb->list); 3900f3e1c7fSRyusuke Konishi kfree(rb); 3910f3e1c7fSRyusuke Konishi } 3920f3e1c7fSRyusuke Konishi } 3930f3e1c7fSRyusuke Konishi 394654137ddSRyusuke Konishi struct nilfs_segment_entry { 395654137ddSRyusuke Konishi struct list_head list; 396654137ddSRyusuke Konishi __u64 segnum; 397654137ddSRyusuke Konishi }; 398654137ddSRyusuke Konishi 399654137ddSRyusuke Konishi static int nilfs_segment_list_add(struct list_head *head, __u64 segnum) 400654137ddSRyusuke Konishi { 401654137ddSRyusuke Konishi struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS); 402654137ddSRyusuke Konishi 403654137ddSRyusuke Konishi if (unlikely(!ent)) 404654137ddSRyusuke Konishi return -ENOMEM; 405654137ddSRyusuke Konishi 406654137ddSRyusuke Konishi ent->segnum = segnum; 407654137ddSRyusuke Konishi INIT_LIST_HEAD(&ent->list); 408654137ddSRyusuke Konishi list_add_tail(&ent->list, head); 409654137ddSRyusuke Konishi return 0; 410654137ddSRyusuke Konishi } 411654137ddSRyusuke Konishi 4120f3e1c7fSRyusuke Konishi void nilfs_dispose_segment_list(struct list_head *head) 4130f3e1c7fSRyusuke Konishi { 4140f3e1c7fSRyusuke Konishi while (!list_empty(head)) { 4150cc12838SRyusuke Konishi struct nilfs_segment_entry *ent; 4160cc12838SRyusuke Konishi 4170cc12838SRyusuke Konishi ent = list_first_entry(head, struct nilfs_segment_entry, list); 4180f3e1c7fSRyusuke Konishi list_del(&ent->list); 419654137ddSRyusuke Konishi kfree(ent); 4200f3e1c7fSRyusuke Konishi } 4210f3e1c7fSRyusuke Konishi } 4220f3e1c7fSRyusuke Konishi 4230f3e1c7fSRyusuke Konishi static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs, 424f7545144SRyusuke Konishi struct super_block *sb, 4250f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 4260f3e1c7fSRyusuke Konishi { 4270f3e1c7fSRyusuke Konishi struct list_head *head = &ri->ri_used_segments; 4280f3e1c7fSRyusuke Konishi struct nilfs_segment_entry *ent, *n; 4290f3e1c7fSRyusuke Konishi struct inode *sufile = nilfs->ns_sufile; 4300f3e1c7fSRyusuke Konishi __u64 segnum[4]; 4310f3e1c7fSRyusuke Konishi int err; 4320f3e1c7fSRyusuke Konishi int i; 4330f3e1c7fSRyusuke Konishi 4340f3e1c7fSRyusuke Konishi segnum[0] = nilfs->ns_segnum; 4350f3e1c7fSRyusuke Konishi segnum[1] = nilfs->ns_nextnum; 4360f3e1c7fSRyusuke Konishi segnum[2] = ri->ri_segnum; 4370f3e1c7fSRyusuke Konishi segnum[3] = ri->ri_nextnum; 4380f3e1c7fSRyusuke Konishi 4390f3e1c7fSRyusuke Konishi /* 4400f3e1c7fSRyusuke Konishi * Releasing the next segment of the latest super root. 4410f3e1c7fSRyusuke Konishi * The next segment is invalidated by this recovery. 4420f3e1c7fSRyusuke Konishi */ 4430f3e1c7fSRyusuke Konishi err = nilfs_sufile_free(sufile, segnum[1]); 4440f3e1c7fSRyusuke Konishi if (unlikely(err)) 4450f3e1c7fSRyusuke Konishi goto failed; 4460f3e1c7fSRyusuke Konishi 4470f3e1c7fSRyusuke Konishi for (i = 1; i < 4; i++) { 448654137ddSRyusuke Konishi err = nilfs_segment_list_add(head, segnum[i]); 449654137ddSRyusuke Konishi if (unlikely(err)) 4500f3e1c7fSRyusuke Konishi goto failed; 4510f3e1c7fSRyusuke Konishi } 4520f3e1c7fSRyusuke Konishi 4530f3e1c7fSRyusuke Konishi /* 4540f3e1c7fSRyusuke Konishi * Collecting segments written after the latest super root. 4552c2e52fcSRyusuke Konishi * These are marked dirty to avoid being reallocated in the next write. 4560f3e1c7fSRyusuke Konishi */ 4570f3e1c7fSRyusuke Konishi list_for_each_entry_safe(ent, n, head, list) { 458c85399c2SRyusuke Konishi if (ent->segnum != segnum[0]) { 459c85399c2SRyusuke Konishi err = nilfs_sufile_scrap(sufile, ent->segnum); 4600f3e1c7fSRyusuke Konishi if (unlikely(err)) 4610f3e1c7fSRyusuke Konishi goto failed; 4622c2e52fcSRyusuke Konishi } 4630f3e1c7fSRyusuke Konishi list_del(&ent->list); 464654137ddSRyusuke Konishi kfree(ent); 4650f3e1c7fSRyusuke Konishi } 4660f3e1c7fSRyusuke Konishi 4670f3e1c7fSRyusuke Konishi /* Allocate new segments for recovery */ 4680f3e1c7fSRyusuke Konishi err = nilfs_sufile_alloc(sufile, &segnum[0]); 4690f3e1c7fSRyusuke Konishi if (unlikely(err)) 4700f3e1c7fSRyusuke Konishi goto failed; 4710f3e1c7fSRyusuke Konishi 4720f3e1c7fSRyusuke Konishi nilfs->ns_pseg_offset = 0; 4730f3e1c7fSRyusuke Konishi nilfs->ns_seg_seq = ri->ri_seq + 2; 4740f3e1c7fSRyusuke Konishi nilfs->ns_nextnum = nilfs->ns_segnum = segnum[0]; 4750f3e1c7fSRyusuke Konishi 4760f3e1c7fSRyusuke Konishi failed: 4770f3e1c7fSRyusuke Konishi /* No need to recover sufile because it will be destroyed on error */ 4780f3e1c7fSRyusuke Konishi return err; 4790f3e1c7fSRyusuke Konishi } 4800f3e1c7fSRyusuke Konishi 4818b94025cSRyusuke Konishi static int nilfs_recovery_copy_block(struct the_nilfs *nilfs, 4820f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb, 4830f3e1c7fSRyusuke Konishi struct page *page) 4840f3e1c7fSRyusuke Konishi { 4850f3e1c7fSRyusuke Konishi struct buffer_head *bh_org; 4860f3e1c7fSRyusuke Konishi void *kaddr; 4870f3e1c7fSRyusuke Konishi 4888b94025cSRyusuke Konishi bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize); 4890f3e1c7fSRyusuke Konishi if (unlikely(!bh_org)) 4900f3e1c7fSRyusuke Konishi return -EIO; 4910f3e1c7fSRyusuke Konishi 4927b9c0976SCong Wang kaddr = kmap_atomic(page); 4930f3e1c7fSRyusuke Konishi memcpy(kaddr + bh_offset(bh_org), bh_org->b_data, bh_org->b_size); 4947b9c0976SCong Wang kunmap_atomic(kaddr); 4950f3e1c7fSRyusuke Konishi brelse(bh_org); 4960f3e1c7fSRyusuke Konishi return 0; 4970f3e1c7fSRyusuke Konishi } 4980f3e1c7fSRyusuke Konishi 4998b94025cSRyusuke Konishi static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, 500f7545144SRyusuke Konishi struct super_block *sb, 5014d8d9293SRyusuke Konishi struct nilfs_root *root, 5020f3e1c7fSRyusuke Konishi struct list_head *head, 5030f3e1c7fSRyusuke Konishi unsigned long *nr_salvaged_blocks) 5040f3e1c7fSRyusuke Konishi { 5050f3e1c7fSRyusuke Konishi struct inode *inode; 5060f3e1c7fSRyusuke Konishi struct nilfs_recovery_block *rb, *n; 5070c6c44cbSRyusuke Konishi unsigned int blocksize = nilfs->ns_blocksize; 5080f3e1c7fSRyusuke Konishi struct page *page; 5090f3e1c7fSRyusuke Konishi loff_t pos; 5100f3e1c7fSRyusuke Konishi int err = 0, err2 = 0; 5110f3e1c7fSRyusuke Konishi 5120f3e1c7fSRyusuke Konishi list_for_each_entry_safe(rb, n, head, list) { 513f7545144SRyusuke Konishi inode = nilfs_iget(sb, root, rb->ino); 5140f3e1c7fSRyusuke Konishi if (IS_ERR(inode)) { 5150f3e1c7fSRyusuke Konishi err = PTR_ERR(inode); 5160f3e1c7fSRyusuke Konishi inode = NULL; 5170f3e1c7fSRyusuke Konishi goto failed_inode; 5180f3e1c7fSRyusuke Konishi } 5190f3e1c7fSRyusuke Konishi 5200f3e1c7fSRyusuke Konishi pos = rb->blkoff << inode->i_blkbits; 521155130a4SChristoph Hellwig err = block_write_begin(inode->i_mapping, pos, blocksize, 522155130a4SChristoph Hellwig 0, &page, nilfs_get_block); 523155130a4SChristoph Hellwig if (unlikely(err)) { 524155130a4SChristoph Hellwig loff_t isize = inode->i_size; 5254ad364caSRyusuke Konishi 526155130a4SChristoph Hellwig if (pos + blocksize > isize) 5272d1b399bSMarco Stornelli nilfs_write_failed(inode->i_mapping, 5282d1b399bSMarco Stornelli pos + blocksize); 5290f3e1c7fSRyusuke Konishi goto failed_inode; 530155130a4SChristoph Hellwig } 5310f3e1c7fSRyusuke Konishi 5328b94025cSRyusuke Konishi err = nilfs_recovery_copy_block(nilfs, rb, page); 5330f3e1c7fSRyusuke Konishi if (unlikely(err)) 5340f3e1c7fSRyusuke Konishi goto failed_page; 5350f3e1c7fSRyusuke Konishi 536bcbc8c64SRyusuke Konishi err = nilfs_set_file_dirty(inode, 1); 5370f3e1c7fSRyusuke Konishi if (unlikely(err)) 5380f3e1c7fSRyusuke Konishi goto failed_page; 5390f3e1c7fSRyusuke Konishi 5400f3e1c7fSRyusuke Konishi block_write_end(NULL, inode->i_mapping, pos, blocksize, 5410f3e1c7fSRyusuke Konishi blocksize, page, NULL); 5420f3e1c7fSRyusuke Konishi 5430f3e1c7fSRyusuke Konishi unlock_page(page); 54409cbfeafSKirill A. Shutemov put_page(page); 5450f3e1c7fSRyusuke Konishi 5460f3e1c7fSRyusuke Konishi (*nr_salvaged_blocks)++; 5470f3e1c7fSRyusuke Konishi goto next; 5480f3e1c7fSRyusuke Konishi 5490f3e1c7fSRyusuke Konishi failed_page: 5500f3e1c7fSRyusuke Konishi unlock_page(page); 55109cbfeafSKirill A. Shutemov put_page(page); 5520f3e1c7fSRyusuke Konishi 5530f3e1c7fSRyusuke Konishi failed_inode: 5540f3e1c7fSRyusuke Konishi printk(KERN_WARNING 5550f3e1c7fSRyusuke Konishi "NILFS warning: error recovering data block " 5560f3e1c7fSRyusuke Konishi "(err=%d, ino=%lu, block-offset=%llu)\n", 557b5696e5eSHeiko Carstens err, (unsigned long)rb->ino, 558b5696e5eSHeiko Carstens (unsigned long long)rb->blkoff); 5590f3e1c7fSRyusuke Konishi if (!err2) 5600f3e1c7fSRyusuke Konishi err2 = err; 5610f3e1c7fSRyusuke Konishi next: 5620f3e1c7fSRyusuke Konishi iput(inode); /* iput(NULL) is just ignored */ 5630f3e1c7fSRyusuke Konishi list_del_init(&rb->list); 5640f3e1c7fSRyusuke Konishi kfree(rb); 5650f3e1c7fSRyusuke Konishi } 5660f3e1c7fSRyusuke Konishi return err2; 5670f3e1c7fSRyusuke Konishi } 5680f3e1c7fSRyusuke Konishi 5690f3e1c7fSRyusuke Konishi /** 5700f3e1c7fSRyusuke Konishi * nilfs_do_roll_forward - salvage logical segments newer than the latest 5710f3e1c7fSRyusuke Konishi * checkpoint 5728b94025cSRyusuke Konishi * @nilfs: nilfs object 573f7545144SRyusuke Konishi * @sb: super block instance 5740f3e1c7fSRyusuke Konishi * @ri: pointer to a nilfs_recovery_info 5750f3e1c7fSRyusuke Konishi */ 5760f3e1c7fSRyusuke Konishi static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 577f7545144SRyusuke Konishi struct super_block *sb, 5784d8d9293SRyusuke Konishi struct nilfs_root *root, 5790f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 5800f3e1c7fSRyusuke Konishi { 581354fa8beSRyusuke Konishi struct buffer_head *bh_sum = NULL; 5824f05028fSRyusuke Konishi struct nilfs_segment_summary *sum = NULL; 5830f3e1c7fSRyusuke Konishi sector_t pseg_start; 5840f3e1c7fSRyusuke Konishi sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */ 5850f3e1c7fSRyusuke Konishi unsigned long nsalvaged_blocks = 0; 58685655484SRyusuke Konishi unsigned int flags; 5870f3e1c7fSRyusuke Konishi u64 seg_seq; 5880f3e1c7fSRyusuke Konishi __u64 segnum, nextnum = 0; 5890f3e1c7fSRyusuke Konishi int empty_seg = 0; 5900f3e1c7fSRyusuke Konishi int err = 0, ret; 5910f3e1c7fSRyusuke Konishi LIST_HEAD(dsync_blocks); /* list of data blocks to be recovered */ 5920f3e1c7fSRyusuke Konishi enum { 5930f3e1c7fSRyusuke Konishi RF_INIT_ST, 5940f3e1c7fSRyusuke Konishi RF_DSYNC_ST, /* scanning data-sync segments */ 5950f3e1c7fSRyusuke Konishi }; 5960f3e1c7fSRyusuke Konishi int state = RF_INIT_ST; 5970f3e1c7fSRyusuke Konishi 5980f3e1c7fSRyusuke Konishi pseg_start = ri->ri_lsegs_start; 5990f3e1c7fSRyusuke Konishi seg_seq = ri->ri_lsegs_start_seq; 6000f3e1c7fSRyusuke Konishi segnum = nilfs_get_segnum_of_block(nilfs, pseg_start); 6010f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 6020f3e1c7fSRyusuke Konishi 6030f3e1c7fSRyusuke Konishi while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) { 604354fa8beSRyusuke Konishi brelse(bh_sum); 605354fa8beSRyusuke Konishi bh_sum = nilfs_read_log_header(nilfs, pseg_start, &sum); 606354fa8beSRyusuke Konishi if (!bh_sum) { 607354fa8beSRyusuke Konishi err = -EIO; 608354fa8beSRyusuke Konishi goto failed; 609354fa8beSRyusuke Konishi } 6100f3e1c7fSRyusuke Konishi 611354fa8beSRyusuke Konishi ret = nilfs_validate_log(nilfs, seg_seq, bh_sum, sum); 6120f3e1c7fSRyusuke Konishi if (ret) { 6130f3e1c7fSRyusuke Konishi if (ret == NILFS_SEG_FAIL_IO) { 6140f3e1c7fSRyusuke Konishi err = -EIO; 6150f3e1c7fSRyusuke Konishi goto failed; 6160f3e1c7fSRyusuke Konishi } 6170f3e1c7fSRyusuke Konishi goto strayed; 6180f3e1c7fSRyusuke Konishi } 619354fa8beSRyusuke Konishi 62085655484SRyusuke Konishi flags = le16_to_cpu(sum->ss_flags); 62185655484SRyusuke Konishi if (flags & NILFS_SS_SR) 6220f3e1c7fSRyusuke Konishi goto confused; 6230f3e1c7fSRyusuke Konishi 6240f3e1c7fSRyusuke Konishi /* Found a valid partial segment; do recovery actions */ 62585655484SRyusuke Konishi nextnum = nilfs_get_segnum_of_block(nilfs, 62685655484SRyusuke Konishi le64_to_cpu(sum->ss_next)); 6270f3e1c7fSRyusuke Konishi empty_seg = 0; 62885655484SRyusuke Konishi nilfs->ns_ctime = le64_to_cpu(sum->ss_create); 62985655484SRyusuke Konishi if (!(flags & NILFS_SS_GC)) 63085655484SRyusuke Konishi nilfs->ns_nongc_ctime = nilfs->ns_ctime; 6310f3e1c7fSRyusuke Konishi 6320f3e1c7fSRyusuke Konishi switch (state) { 6330f3e1c7fSRyusuke Konishi case RF_INIT_ST: 63485655484SRyusuke Konishi if (!(flags & NILFS_SS_LOGBGN) || 63585655484SRyusuke Konishi !(flags & NILFS_SS_SYNDT)) 6360f3e1c7fSRyusuke Konishi goto try_next_pseg; 6370f3e1c7fSRyusuke Konishi state = RF_DSYNC_ST; 6380f3e1c7fSRyusuke Konishi /* Fall through */ 6390f3e1c7fSRyusuke Konishi case RF_DSYNC_ST: 64085655484SRyusuke Konishi if (!(flags & NILFS_SS_SYNDT)) 6410f3e1c7fSRyusuke Konishi goto confused; 6420f3e1c7fSRyusuke Konishi 64385655484SRyusuke Konishi err = nilfs_scan_dsync_log(nilfs, pseg_start, sum, 6448b94025cSRyusuke Konishi &dsync_blocks); 6450f3e1c7fSRyusuke Konishi if (unlikely(err)) 6460f3e1c7fSRyusuke Konishi goto failed; 64785655484SRyusuke Konishi if (flags & NILFS_SS_LOGEND) { 6488b94025cSRyusuke Konishi err = nilfs_recover_dsync_blocks( 649f7545144SRyusuke Konishi nilfs, sb, root, &dsync_blocks, 6508b94025cSRyusuke Konishi &nsalvaged_blocks); 6510f3e1c7fSRyusuke Konishi if (unlikely(err)) 6520f3e1c7fSRyusuke Konishi goto failed; 6530f3e1c7fSRyusuke Konishi state = RF_INIT_ST; 6540f3e1c7fSRyusuke Konishi } 6550f3e1c7fSRyusuke Konishi break; /* Fall through to try_next_pseg */ 6560f3e1c7fSRyusuke Konishi } 6570f3e1c7fSRyusuke Konishi 6580f3e1c7fSRyusuke Konishi try_next_pseg: 6590f3e1c7fSRyusuke Konishi if (pseg_start == ri->ri_lsegs_end) 6600f3e1c7fSRyusuke Konishi break; 66185655484SRyusuke Konishi pseg_start += le32_to_cpu(sum->ss_nblocks); 6620f3e1c7fSRyusuke Konishi if (pseg_start < seg_end) 6630f3e1c7fSRyusuke Konishi continue; 6640f3e1c7fSRyusuke Konishi goto feed_segment; 6650f3e1c7fSRyusuke Konishi 6660f3e1c7fSRyusuke Konishi strayed: 6670f3e1c7fSRyusuke Konishi if (pseg_start == ri->ri_lsegs_end) 6680f3e1c7fSRyusuke Konishi break; 6690f3e1c7fSRyusuke Konishi 6700f3e1c7fSRyusuke Konishi feed_segment: 6710f3e1c7fSRyusuke Konishi /* Looking to the next full segment */ 6720f3e1c7fSRyusuke Konishi if (empty_seg++) 6730f3e1c7fSRyusuke Konishi break; 6740f3e1c7fSRyusuke Konishi seg_seq++; 6750f3e1c7fSRyusuke Konishi segnum = nextnum; 6760f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 6770f3e1c7fSRyusuke Konishi pseg_start = seg_start; 6780f3e1c7fSRyusuke Konishi } 6790f3e1c7fSRyusuke Konishi 6800f3e1c7fSRyusuke Konishi if (nsalvaged_blocks) { 6810f3e1c7fSRyusuke Konishi printk(KERN_INFO "NILFS (device %s): salvaged %lu blocks\n", 682f7545144SRyusuke Konishi sb->s_id, nsalvaged_blocks); 6830f3e1c7fSRyusuke Konishi ri->ri_need_recovery = NILFS_RECOVERY_ROLLFORWARD_DONE; 6840f3e1c7fSRyusuke Konishi } 6850f3e1c7fSRyusuke Konishi out: 686354fa8beSRyusuke Konishi brelse(bh_sum); 6870f3e1c7fSRyusuke Konishi dispose_recovery_list(&dsync_blocks); 6880f3e1c7fSRyusuke Konishi return err; 6890f3e1c7fSRyusuke Konishi 6900f3e1c7fSRyusuke Konishi confused: 6910f3e1c7fSRyusuke Konishi err = -EINVAL; 6920f3e1c7fSRyusuke Konishi failed: 6930f3e1c7fSRyusuke Konishi printk(KERN_ERR 6940f3e1c7fSRyusuke Konishi "NILFS (device %s): Error roll-forwarding " 6950f3e1c7fSRyusuke Konishi "(err=%d, pseg block=%llu). ", 696f7545144SRyusuke Konishi sb->s_id, err, (unsigned long long)pseg_start); 6970f3e1c7fSRyusuke Konishi goto out; 6980f3e1c7fSRyusuke Konishi } 6990f3e1c7fSRyusuke Konishi 7000f3e1c7fSRyusuke Konishi static void nilfs_finish_roll_forward(struct the_nilfs *nilfs, 7010f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 7020f3e1c7fSRyusuke Konishi { 7030f3e1c7fSRyusuke Konishi struct buffer_head *bh; 7040f3e1c7fSRyusuke Konishi int err; 7050f3e1c7fSRyusuke Konishi 7060f3e1c7fSRyusuke Konishi if (nilfs_get_segnum_of_block(nilfs, ri->ri_lsegs_start) != 7070f3e1c7fSRyusuke Konishi nilfs_get_segnum_of_block(nilfs, ri->ri_super_root)) 7080f3e1c7fSRyusuke Konishi return; 7090f3e1c7fSRyusuke Konishi 7108b94025cSRyusuke Konishi bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize); 7110f3e1c7fSRyusuke Konishi BUG_ON(!bh); 7120f3e1c7fSRyusuke Konishi memset(bh->b_data, 0, bh->b_size); 7130f3e1c7fSRyusuke Konishi set_buffer_dirty(bh); 7140f3e1c7fSRyusuke Konishi err = sync_dirty_buffer(bh); 7150f3e1c7fSRyusuke Konishi if (unlikely(err)) 7160f3e1c7fSRyusuke Konishi printk(KERN_WARNING 7170f3e1c7fSRyusuke Konishi "NILFS warning: buffer sync write failed during " 7180f3e1c7fSRyusuke Konishi "post-cleaning of recovery.\n"); 7190f3e1c7fSRyusuke Konishi brelse(bh); 7200f3e1c7fSRyusuke Konishi } 7210f3e1c7fSRyusuke Konishi 7220f3e1c7fSRyusuke Konishi /** 723aee5ce2fSRyusuke Konishi * nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint 724aee5ce2fSRyusuke Konishi * @nilfs: nilfs object 725f7545144SRyusuke Konishi * @sb: super block instance 7260f3e1c7fSRyusuke Konishi * @ri: pointer to a nilfs_recovery_info struct to store search results. 7270f3e1c7fSRyusuke Konishi * 7280f3e1c7fSRyusuke Konishi * Return Value: On success, 0 is returned. On error, one of the following 7290f3e1c7fSRyusuke Konishi * negative error code is returned. 7300f3e1c7fSRyusuke Konishi * 7310f3e1c7fSRyusuke Konishi * %-EINVAL - Inconsistent filesystem state. 7320f3e1c7fSRyusuke Konishi * 7330f3e1c7fSRyusuke Konishi * %-EIO - I/O error 7340f3e1c7fSRyusuke Konishi * 7350f3e1c7fSRyusuke Konishi * %-ENOSPC - No space left on device (only in a panic state). 7360f3e1c7fSRyusuke Konishi * 7370f3e1c7fSRyusuke Konishi * %-ERESTARTSYS - Interrupted. 7380f3e1c7fSRyusuke Konishi * 7390f3e1c7fSRyusuke Konishi * %-ENOMEM - Insufficient memory available. 7400f3e1c7fSRyusuke Konishi */ 741aee5ce2fSRyusuke Konishi int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, 742f7545144SRyusuke Konishi struct super_block *sb, 7430f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 7440f3e1c7fSRyusuke Konishi { 7454d8d9293SRyusuke Konishi struct nilfs_root *root; 7460f3e1c7fSRyusuke Konishi int err; 7470f3e1c7fSRyusuke Konishi 7480f3e1c7fSRyusuke Konishi if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0) 7490f3e1c7fSRyusuke Konishi return 0; 7500f3e1c7fSRyusuke Konishi 751f7545144SRyusuke Konishi err = nilfs_attach_checkpoint(sb, ri->ri_cno, true, &root); 7520f3e1c7fSRyusuke Konishi if (unlikely(err)) { 7530f3e1c7fSRyusuke Konishi printk(KERN_ERR 7540f3e1c7fSRyusuke Konishi "NILFS: error loading the latest checkpoint.\n"); 7550f3e1c7fSRyusuke Konishi return err; 7560f3e1c7fSRyusuke Konishi } 7570f3e1c7fSRyusuke Konishi 758f7545144SRyusuke Konishi err = nilfs_do_roll_forward(nilfs, sb, root, ri); 7590f3e1c7fSRyusuke Konishi if (unlikely(err)) 7600f3e1c7fSRyusuke Konishi goto failed; 7610f3e1c7fSRyusuke Konishi 7620f3e1c7fSRyusuke Konishi if (ri->ri_need_recovery == NILFS_RECOVERY_ROLLFORWARD_DONE) { 763f7545144SRyusuke Konishi err = nilfs_prepare_segment_for_recovery(nilfs, sb, ri); 7640f3e1c7fSRyusuke Konishi if (unlikely(err)) { 7650f3e1c7fSRyusuke Konishi printk(KERN_ERR "NILFS: Error preparing segments for " 7660f3e1c7fSRyusuke Konishi "recovery.\n"); 7670f3e1c7fSRyusuke Konishi goto failed; 7680f3e1c7fSRyusuke Konishi } 7690f3e1c7fSRyusuke Konishi 770f7545144SRyusuke Konishi err = nilfs_attach_log_writer(sb, root); 7710f3e1c7fSRyusuke Konishi if (unlikely(err)) 7720f3e1c7fSRyusuke Konishi goto failed; 7730f3e1c7fSRyusuke Konishi 7740f3e1c7fSRyusuke Konishi set_nilfs_discontinued(nilfs); 775f7545144SRyusuke Konishi err = nilfs_construct_segment(sb); 776f7545144SRyusuke Konishi nilfs_detach_log_writer(sb); 7770f3e1c7fSRyusuke Konishi 7780f3e1c7fSRyusuke Konishi if (unlikely(err)) { 7790f3e1c7fSRyusuke Konishi printk(KERN_ERR "NILFS: Oops! recovery failed. " 7800f3e1c7fSRyusuke Konishi "(err=%d)\n", err); 7810f3e1c7fSRyusuke Konishi goto failed; 7820f3e1c7fSRyusuke Konishi } 7830f3e1c7fSRyusuke Konishi 7848b94025cSRyusuke Konishi nilfs_finish_roll_forward(nilfs, ri); 7850f3e1c7fSRyusuke Konishi } 7860f3e1c7fSRyusuke Konishi 7870f3e1c7fSRyusuke Konishi failed: 7884d8d9293SRyusuke Konishi nilfs_put_root(root); 7890f3e1c7fSRyusuke Konishi return err; 7900f3e1c7fSRyusuke Konishi } 7910f3e1c7fSRyusuke Konishi 7920f3e1c7fSRyusuke Konishi /** 7930f3e1c7fSRyusuke Konishi * nilfs_search_super_root - search the latest valid super root 7940f3e1c7fSRyusuke Konishi * @nilfs: the_nilfs 7950f3e1c7fSRyusuke Konishi * @ri: pointer to a nilfs_recovery_info struct to store search results. 7960f3e1c7fSRyusuke Konishi * 7970f3e1c7fSRyusuke Konishi * nilfs_search_super_root() looks for the latest super-root from a partial 7980f3e1c7fSRyusuke Konishi * segment pointed by the superblock. It sets up struct the_nilfs through 7990f3e1c7fSRyusuke Konishi * this search. It fills nilfs_recovery_info (ri) required for recovery. 8000f3e1c7fSRyusuke Konishi * 8010f3e1c7fSRyusuke Konishi * Return Value: On success, 0 is returned. On error, one of the following 8020f3e1c7fSRyusuke Konishi * negative error code is returned. 8030f3e1c7fSRyusuke Konishi * 8040f3e1c7fSRyusuke Konishi * %-EINVAL - No valid segment found 8050f3e1c7fSRyusuke Konishi * 8060f3e1c7fSRyusuke Konishi * %-EIO - I/O error 8072d72b99eSRyusuke Konishi * 8082d72b99eSRyusuke Konishi * %-ENOMEM - Insufficient memory available. 8090f3e1c7fSRyusuke Konishi */ 8108b94025cSRyusuke Konishi int nilfs_search_super_root(struct the_nilfs *nilfs, 8110f3e1c7fSRyusuke Konishi struct nilfs_recovery_info *ri) 8120f3e1c7fSRyusuke Konishi { 813354fa8beSRyusuke Konishi struct buffer_head *bh_sum = NULL; 8144f05028fSRyusuke Konishi struct nilfs_segment_summary *sum = NULL; 8150f3e1c7fSRyusuke Konishi sector_t pseg_start, pseg_end, sr_pseg_start = 0; 8160f3e1c7fSRyusuke Konishi sector_t seg_start, seg_end; /* range of full segment (block number) */ 817050b4142SRyusuke Konishi sector_t b, end; 81885655484SRyusuke Konishi unsigned long nblocks; 81985655484SRyusuke Konishi unsigned int flags; 8200f3e1c7fSRyusuke Konishi u64 seg_seq; 8210f3e1c7fSRyusuke Konishi __u64 segnum, nextnum = 0; 8220f3e1c7fSRyusuke Konishi __u64 cno; 8230f3e1c7fSRyusuke Konishi LIST_HEAD(segments); 8240f3e1c7fSRyusuke Konishi int empty_seg = 0, scan_newer = 0; 8250f3e1c7fSRyusuke Konishi int ret; 8260f3e1c7fSRyusuke Konishi 8270f3e1c7fSRyusuke Konishi pseg_start = nilfs->ns_last_pseg; 8280f3e1c7fSRyusuke Konishi seg_seq = nilfs->ns_last_seq; 8290f3e1c7fSRyusuke Konishi cno = nilfs->ns_last_cno; 8300f3e1c7fSRyusuke Konishi segnum = nilfs_get_segnum_of_block(nilfs, pseg_start); 8310f3e1c7fSRyusuke Konishi 8320f3e1c7fSRyusuke Konishi /* Calculate range of segment */ 8330f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 8340f3e1c7fSRyusuke Konishi 835050b4142SRyusuke Konishi /* Read ahead segment */ 836050b4142SRyusuke Konishi b = seg_start; 837050b4142SRyusuke Konishi while (b <= seg_end) 8388b94025cSRyusuke Konishi __breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize); 839050b4142SRyusuke Konishi 8400f3e1c7fSRyusuke Konishi for (;;) { 841354fa8beSRyusuke Konishi brelse(bh_sum); 842354fa8beSRyusuke Konishi ret = NILFS_SEG_FAIL_IO; 843354fa8beSRyusuke Konishi bh_sum = nilfs_read_log_header(nilfs, pseg_start, &sum); 844354fa8beSRyusuke Konishi if (!bh_sum) 845354fa8beSRyusuke Konishi goto failed; 846354fa8beSRyusuke Konishi 847354fa8beSRyusuke Konishi ret = nilfs_validate_log(nilfs, seg_seq, bh_sum, sum); 8480f3e1c7fSRyusuke Konishi if (ret) { 8490f3e1c7fSRyusuke Konishi if (ret == NILFS_SEG_FAIL_IO) 8500f3e1c7fSRyusuke Konishi goto failed; 8510f3e1c7fSRyusuke Konishi goto strayed; 8520f3e1c7fSRyusuke Konishi } 853354fa8beSRyusuke Konishi 85485655484SRyusuke Konishi nblocks = le32_to_cpu(sum->ss_nblocks); 85585655484SRyusuke Konishi pseg_end = pseg_start + nblocks - 1; 8560f3e1c7fSRyusuke Konishi if (unlikely(pseg_end > seg_end)) { 8570f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CONSISTENCY; 8580f3e1c7fSRyusuke Konishi goto strayed; 8590f3e1c7fSRyusuke Konishi } 8600f3e1c7fSRyusuke Konishi 8610f3e1c7fSRyusuke Konishi /* A valid partial segment */ 8620f3e1c7fSRyusuke Konishi ri->ri_pseg_start = pseg_start; 8630f3e1c7fSRyusuke Konishi ri->ri_seq = seg_seq; 8640f3e1c7fSRyusuke Konishi ri->ri_segnum = segnum; 86585655484SRyusuke Konishi nextnum = nilfs_get_segnum_of_block(nilfs, 86685655484SRyusuke Konishi le64_to_cpu(sum->ss_next)); 8670f3e1c7fSRyusuke Konishi ri->ri_nextnum = nextnum; 8680f3e1c7fSRyusuke Konishi empty_seg = 0; 8690f3e1c7fSRyusuke Konishi 87085655484SRyusuke Konishi flags = le16_to_cpu(sum->ss_flags); 87185655484SRyusuke Konishi if (!(flags & NILFS_SS_SR) && !scan_newer) { 8720f3e1c7fSRyusuke Konishi /* This will never happen because a superblock 8730f3e1c7fSRyusuke Konishi (last_segment) always points to a pseg 8740f3e1c7fSRyusuke Konishi having a super root. */ 8750f3e1c7fSRyusuke Konishi ret = NILFS_SEG_FAIL_CONSISTENCY; 8760f3e1c7fSRyusuke Konishi goto failed; 8770f3e1c7fSRyusuke Konishi } 878050b4142SRyusuke Konishi 879050b4142SRyusuke Konishi if (pseg_start == seg_start) { 880050b4142SRyusuke Konishi nilfs_get_segment_range(nilfs, nextnum, &b, &end); 881050b4142SRyusuke Konishi while (b <= end) 8828b94025cSRyusuke Konishi __breadahead(nilfs->ns_bdev, b++, 8838b94025cSRyusuke Konishi nilfs->ns_blocksize); 884050b4142SRyusuke Konishi } 88585655484SRyusuke Konishi if (!(flags & NILFS_SS_SR)) { 88685655484SRyusuke Konishi if (!ri->ri_lsegs_start && (flags & NILFS_SS_LOGBGN)) { 8870f3e1c7fSRyusuke Konishi ri->ri_lsegs_start = pseg_start; 8880f3e1c7fSRyusuke Konishi ri->ri_lsegs_start_seq = seg_seq; 8890f3e1c7fSRyusuke Konishi } 89085655484SRyusuke Konishi if (flags & NILFS_SS_LOGEND) 8910f3e1c7fSRyusuke Konishi ri->ri_lsegs_end = pseg_start; 8920f3e1c7fSRyusuke Konishi goto try_next_pseg; 8930f3e1c7fSRyusuke Konishi } 8940f3e1c7fSRyusuke Konishi 8950f3e1c7fSRyusuke Konishi /* A valid super root was found. */ 8960f3e1c7fSRyusuke Konishi ri->ri_cno = cno++; 8970f3e1c7fSRyusuke Konishi ri->ri_super_root = pseg_end; 8980f3e1c7fSRyusuke Konishi ri->ri_lsegs_start = ri->ri_lsegs_end = 0; 8990f3e1c7fSRyusuke Konishi 9000f3e1c7fSRyusuke Konishi nilfs_dispose_segment_list(&segments); 90185655484SRyusuke Konishi sr_pseg_start = pseg_start; 90285655484SRyusuke Konishi nilfs->ns_pseg_offset = pseg_start + nblocks - seg_start; 9030f3e1c7fSRyusuke Konishi nilfs->ns_seg_seq = seg_seq; 9040f3e1c7fSRyusuke Konishi nilfs->ns_segnum = segnum; 9050f3e1c7fSRyusuke Konishi nilfs->ns_cno = cno; /* nilfs->ns_cno = ri->ri_cno + 1 */ 90685655484SRyusuke Konishi nilfs->ns_ctime = le64_to_cpu(sum->ss_create); 9070f3e1c7fSRyusuke Konishi nilfs->ns_nextnum = nextnum; 9080f3e1c7fSRyusuke Konishi 9090f3e1c7fSRyusuke Konishi if (scan_newer) 9100f3e1c7fSRyusuke Konishi ri->ri_need_recovery = NILFS_RECOVERY_SR_UPDATED; 9112c2e52fcSRyusuke Konishi else { 9122c2e52fcSRyusuke Konishi if (nilfs->ns_mount_state & NILFS_VALID_FS) 9130f3e1c7fSRyusuke Konishi goto super_root_found; 9140f3e1c7fSRyusuke Konishi scan_newer = 1; 9152c2e52fcSRyusuke Konishi } 9160f3e1c7fSRyusuke Konishi 9170f3e1c7fSRyusuke Konishi try_next_pseg: 9180f3e1c7fSRyusuke Konishi /* Standing on a course, or met an inconsistent state */ 91985655484SRyusuke Konishi pseg_start += nblocks; 9200f3e1c7fSRyusuke Konishi if (pseg_start < seg_end) 9210f3e1c7fSRyusuke Konishi continue; 9220f3e1c7fSRyusuke Konishi goto feed_segment; 9230f3e1c7fSRyusuke Konishi 9240f3e1c7fSRyusuke Konishi strayed: 9250f3e1c7fSRyusuke Konishi /* Off the trail */ 9260f3e1c7fSRyusuke Konishi if (!scan_newer) 9270f3e1c7fSRyusuke Konishi /* 9280f3e1c7fSRyusuke Konishi * This can happen if a checkpoint was written without 9290f3e1c7fSRyusuke Konishi * barriers, or as a result of an I/O failure. 9300f3e1c7fSRyusuke Konishi */ 9310f3e1c7fSRyusuke Konishi goto failed; 9320f3e1c7fSRyusuke Konishi 9330f3e1c7fSRyusuke Konishi feed_segment: 9340f3e1c7fSRyusuke Konishi /* Looking to the next full segment */ 9350f3e1c7fSRyusuke Konishi if (empty_seg++) 9360f3e1c7fSRyusuke Konishi goto super_root_found; /* found a valid super root */ 9370f3e1c7fSRyusuke Konishi 938654137ddSRyusuke Konishi ret = nilfs_segment_list_add(&segments, segnum); 939654137ddSRyusuke Konishi if (unlikely(ret)) 9400f3e1c7fSRyusuke Konishi goto failed; 9410f3e1c7fSRyusuke Konishi 9420f3e1c7fSRyusuke Konishi seg_seq++; 9430f3e1c7fSRyusuke Konishi segnum = nextnum; 9440f3e1c7fSRyusuke Konishi nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); 9450f3e1c7fSRyusuke Konishi pseg_start = seg_start; 9460f3e1c7fSRyusuke Konishi } 9470f3e1c7fSRyusuke Konishi 9480f3e1c7fSRyusuke Konishi super_root_found: 9490f3e1c7fSRyusuke Konishi /* Updating pointers relating to the latest checkpoint */ 950354fa8beSRyusuke Konishi brelse(bh_sum); 9510935db74SRyusuke Konishi list_splice_tail(&segments, &ri->ri_used_segments); 9520f3e1c7fSRyusuke Konishi nilfs->ns_last_pseg = sr_pseg_start; 9530f3e1c7fSRyusuke Konishi nilfs->ns_last_seq = nilfs->ns_seg_seq; 9540f3e1c7fSRyusuke Konishi nilfs->ns_last_cno = ri->ri_cno; 9550f3e1c7fSRyusuke Konishi return 0; 9560f3e1c7fSRyusuke Konishi 9570f3e1c7fSRyusuke Konishi failed: 958354fa8beSRyusuke Konishi brelse(bh_sum); 9590f3e1c7fSRyusuke Konishi nilfs_dispose_segment_list(&segments); 9600f3e1c7fSRyusuke Konishi return (ret < 0) ? ret : nilfs_warn_segment_error(ret); 9610f3e1c7fSRyusuke Konishi } 962