diff options
Diffstat (limited to 'fs/xfs/xfs_log_recover.c')
| -rw-r--r-- | fs/xfs/xfs_log_recover.c | 4098 |
1 files changed, 4098 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c new file mode 100644 index 000000000000..9824b5bf0ec0 --- /dev/null +++ b/fs/xfs/xfs_log_recover.c @@ -0,0 +1,4098 @@ +/* + * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ + +#include "xfs.h" +#include "xfs_macros.h" +#include "xfs_types.h" +#include "xfs_inum.h" +#include "xfs_log.h" +#include "xfs_ag.h" +#include "xfs_sb.h" +#include "xfs_trans.h" +#include "xfs_dir.h" +#include "xfs_dir2.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" +#include "xfs_error.h" +#include "xfs_bmap_btree.h" +#include "xfs_alloc.h" +#include "xfs_attr_sf.h" +#include "xfs_dir_sf.h" +#include "xfs_dir2_sf.h" +#include "xfs_dinode.h" +#include "xfs_imap.h" +#include "xfs_inode_item.h" +#include "xfs_inode.h" +#include "xfs_ialloc_btree.h" +#include "xfs_ialloc.h" +#include "xfs_log_priv.h" +#include "xfs_buf_item.h" +#include "xfs_alloc_btree.h" +#include "xfs_log_recover.h" +#include "xfs_extfree_item.h" +#include "xfs_trans_priv.h" +#include "xfs_bit.h" +#include "xfs_quota.h" +#include "xfs_rw.h" + +STATIC int xlog_find_zeroed(xlog_t *, xfs_daddr_t *); +STATIC int xlog_clear_stale_blocks(xlog_t *, xfs_lsn_t); +STATIC void xlog_recover_insert_item_backq(xlog_recover_item_t **q, + xlog_recover_item_t *item); +#if defined(DEBUG) +STATIC void xlog_recover_check_summary(xlog_t *); +STATIC void xlog_recover_check_ail(xfs_mount_t *, xfs_log_item_t *, int); +#else +#define xlog_recover_check_summary(log) +#define xlog_recover_check_ail(mp, lip, gen) +#endif + + +/* + * Sector aligned buffer routines for buffer create/read/write/access + */ + +#define XLOG_SECTOR_ROUNDUP_BBCOUNT(log, bbs) \ + ( ((log)->l_sectbb_mask && (bbs & (log)->l_sectbb_mask)) ? \ + ((bbs + (log)->l_sectbb_mask + 1) & ~(log)->l_sectbb_mask) : (bbs) ) +#define XLOG_SECTOR_ROUNDDOWN_BLKNO(log, bno) ((bno) & ~(log)->l_sectbb_mask) + +xfs_buf_t * +xlog_get_bp( + xlog_t *log, + int num_bblks) +{ + ASSERT(num_bblks > 0); + + if (log->l_sectbb_log) { + if (num_bblks > 1) + num_bblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1); + num_bblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, num_bblks); + } + return xfs_buf_get_noaddr(BBTOB(num_bblks), log->l_mp->m_logdev_targp); +} + +void +xlog_put_bp( + xfs_buf_t *bp) +{ + xfs_buf_free(bp); +} + + +/* + * nbblks should be uint, but oh well. Just want to catch that 32-bit length. + */ +int +xlog_bread( + xlog_t *log, + xfs_daddr_t blk_no, + int nbblks, + xfs_buf_t *bp) +{ + int error; + + if (log->l_sectbb_log) { + blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no); + nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks); + } + + ASSERT(nbblks > 0); + ASSERT(BBTOB(nbblks) <= XFS_BUF_SIZE(bp)); + ASSERT(bp); + + XFS_BUF_SET_ADDR(bp, log->l_logBBstart + blk_no); + XFS_BUF_READ(bp); + XFS_BUF_BUSY(bp); + XFS_BUF_SET_COUNT(bp, BBTOB(nbblks)); + XFS_BUF_SET_TARGET(bp, log->l_mp->m_logdev_targp); + + xfsbdstrat(log->l_mp, bp); + if ((error = xfs_iowait(bp))) + xfs_ioerror_alert("xlog_bread", log->l_mp, + bp, XFS_BUF_ADDR(bp)); + return error; +} + +/* + * Write out the buffer at the given block for the given number of blocks. + * The buffer is kept locked across the write and is returned locked. + * This can only be used for synchronous log writes. + */ +int +xlog_bwrite( + xlog_t *log, + xfs_daddr_t blk_no, + int nbblks, + xfs_buf_t *bp) +{ + int error; + + if (log->l_sectbb_log) { + blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no); + nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks); + } + + ASSERT(nbblks > 0); + ASSERT(BBTOB(nbblks) <= XFS_BUF_SIZE(bp)); + + XFS_BUF_SET_ADDR(bp, log->l_logBBstart + blk_no); + XFS_BUF_ZEROFLAGS(bp); + XFS_BUF_BUSY(bp); + XFS_BUF_HOLD(bp); + XFS_BUF_PSEMA(bp, PRIBIO); + XFS_BUF_SET_COUNT(bp, BBTOB(nbblks)); + XFS_BUF_SET_TARGET(bp, log->l_mp->m_logdev_targp); + + if ((error = xfs_bwrite(log->l_mp, bp))) + xfs_ioerror_alert("xlog_bwrite", log->l_mp, + bp, XFS_BUF_ADDR(bp)); + return error; +} + +xfs_caddr_t +xlog_align( + xlog_t *log, + xfs_daddr_t blk_no, + int nbblks, + xfs_buf_t *bp) +{ + xfs_caddr_t ptr; + + if (!log->l_sectbb_log) + return XFS_BUF_PTR(bp); + + ptr = XFS_BUF_PTR(bp) + BBTOB((int)blk_no & log->l_sectbb_mask); + ASSERT(XFS_BUF_SIZE(bp) >= + BBTOB(nbblks + (blk_no & log->l_sectbb_mask))); + return ptr; +} + +#ifdef DEBUG +/* + * dump debug superblock and log record information + */ +STATIC void +xlog_header_check_dump( + xfs_mount_t *mp, + xlog_rec_header_t *head) +{ + int b; + + printk("%s: SB : uuid = ", __FUNCTION__); + for (b = 0; b < 16; b++) + printk("%02x",((unsigned char *)&mp->m_sb.sb_uuid)[b]); + printk(", fmt = %d\n", XLOG_FMT); + printk(" log : uuid = "); + for (b = 0; b < 16; b++) + printk("%02x",((unsigned char *)&head->h_fs_uuid)[b]); + printk(", fmt = %d\n", INT_GET(head->h_fmt, ARCH_CONVERT)); +} +#else +#define xlog_header_check_dump(mp, head) +#endif + +/* + * check log record header for recovery + */ +STATIC int +xlog_header_check_recover( + xfs_mount_t *mp, + xlog_rec_header_t *head) +{ + ASSERT(INT_GET(head->h_magicno, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM); + + /* + * IRIX doesn't write the h_fmt field and leaves it zeroed + * (XLOG_FMT_UNKNOWN). This stops us from trying to recover + * a dirty log created in IRIX. + */ + if (unlikely(INT_GET(head->h_fmt, ARCH_CONVERT) != XLOG_FMT)) { + xlog_warn( + "XFS: dirty log written in incompatible format - can't recover"); + xlog_header_check_dump(mp, head); + XFS_ERROR_REPORT("xlog_header_check_recover(1)", + XFS_ERRLEVEL_HIGH, mp); + return XFS_ERROR(EFSCORRUPTED); + } else if (unlikely(!uuid_equal(&mp->m_sb.sb_uuid, &head->h_fs_uuid))) { + xlog_warn( + "XFS: dirty log entry has mismatched uuid - can't recover"); + xlog_header_check_dump(mp, head); + XFS_ERROR_REPORT("xlog_header_check_recover(2)", + XFS_ERRLEVEL_HIGH, mp); + return XFS_ERROR(EFSCORRUPTED); + } + return 0; +} + +/* + * read the head block of the log and check the header + */ +STATIC int +xlog_header_check_mount( + xfs_mount_t *mp, + xlog_rec_header_t *head) +{ + ASSERT(INT_GET(head->h_magicno, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM); + + if (uuid_is_nil(&head->h_fs_uuid)) { + /* + * IRIX doesn't write the h_fs_uuid or h_fmt fields. If + * h_fs_uuid is nil, we assume this log was last mounted + * by IRIX and continue. + */ + xlog_warn("XFS: nil uuid in log - IRIX style log"); + } else if (unlikely(!uuid_equal(&mp->m_sb.sb_uuid, &head->h_fs_uuid))) { + xlog_warn("XFS: log has mismatched uuid - can't recover"); + xlog_header_check_dump(mp, head); + XFS_ERROR_REPORT("xlog_header_check_mount", + XFS_ERRLEVEL_HIGH, mp); + return XFS_ERROR(EFSCORRUPTED); + } + return 0; +} + +STATIC void +xlog_recover_iodone( + struct xfs_buf *bp) +{ + xfs_mount_t *mp; + + ASSERT(XFS_BUF_FSPRIVATE(bp, void *)); + + if (XFS_BUF_GETERROR(bp)) { + /* + * We're not going to bother about retrying + * this during recovery. One strike! + */ + mp = XFS_BUF_FSPRIVATE(bp, xfs_mount_t *); + xfs_ioerror_alert("xlog_recover_iodone", + mp, bp, XFS_BUF_ADDR(bp)); + xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR); + } + XFS_BUF_SET_FSPRIVATE(bp, NULL); + XFS_BUF_CLR_IODONE_FUNC(bp); + xfs_biodone(bp); +} + +/* + * This routine finds (to an approximation) the first block in the physical + * log which contains the given cycle. It uses a binary search algorithm. + * Note that the algorithm can not be perfect because the disk will not + * necessarily be perfect. + */ +int +xlog_find_cycle_start( + xlog_t *log, + xfs_buf_t *bp, + xfs_daddr_t first_blk, + xfs_daddr_t *last_blk, + uint cycle) +{ + xfs_caddr_t offset; + xfs_daddr_t mid_blk; + uint mid_cycle; + int error; + + mid_blk = BLK_AVG(first_blk, *last_blk); + while (mid_blk != first_blk && mid_blk != *last_blk) { + if ((error = xlog_bread(log, mid_blk, 1, bp))) + return error; + offset = xlog_align(log, mid_blk, 1, bp); + mid_cycle = GET_CYCLE(offset, ARCH_CONVERT); + if (mid_cycle == cycle) { + *last_blk = mid_blk; + /* last_half_cycle == mid_cycle */ + } else { + first_blk = mid_blk; + /* first_half_cycle == mid_cycle */ + } + mid_blk = BLK_AVG(first_blk, *last_blk); + } + ASSERT((mid_blk == first_blk && mid_blk+1 == *last_blk) || + (mid_blk == *last_blk && mid_blk-1 == first_blk)); + + return 0; +} + +/* + * Check that the range of blocks does not contain the cycle number + * given. The scan needs to occur from front to back and the ptr into the + * region must be updated since a later routine will need to perform another + * test. If the region is completely good, we end up returning the same + * last block number. + * + * Set blkno to -1 if we encounter no errors. This is an invalid block number + * since we don't ever expect logs to get this large. + */ +STATIC int +xlog_find_verify_cycle( + xlog_t *log, + xfs_daddr_t start_blk, + int nbblks, + uint stop_on_cycle_no, + xfs_daddr_t *new_blk) +{ + xfs_daddr_t i, j; + uint cycle; + xfs_buf_t *bp; + xfs_daddr_t bufblks; + xfs_caddr_t buf = NULL; + int error = 0; + + bufblks = 1 << ffs(nbblks); + + while (!(bp = xlog_get_bp(log, bufblks))) { + /* can't get enough memory to do everything in one big buffer */ + bufblks >>= 1; + if (bufblks <= log->l_sectbb_log) + return ENOMEM; + } + + for (i = start_blk; i < start_blk + nbblks; i += bufblks) { + int bcount; + + bcount = min(bufblks, (start_blk + nbblks - i)); + + if ((error = xlog_bread(log, i, bcount, bp))) + goto out; + + buf = xlog_align(log, i, bcount, bp); + for (j = 0; j < bcount; j++) { + cycle = GET_CYCLE(buf, ARCH_CONVERT); + if (cycle == stop_on_cycle_no) { + *new_blk = i+j; + goto out; + } + + buf += BBSIZE; + } + } + + *new_blk = -1; + +out: + xlog_put_bp(bp); + return error; +} + +/* + * Potentially backup over partial log record write. + * + * In the typical case, last_blk is the number of the block directly after + * a good log record. Therefore, we subtract one to get the block number + * of the last block in the given buffer. extra_bblks contains the number + * of blocks we would have read on a previous read. This happens when the + * last log record is split over the end of the physical log. + * + * extra_bblks is the number of blocks potentially verified on a previous + * call to this routine. + */ +STATIC int +xlog_find_verify_log_record( + xlog_t *log, + xfs_daddr_t start_blk, + xfs_daddr_t *last_blk, + int extra_bblks) +{ + xfs_daddr_t i; + xfs_buf_t *bp; + xfs_caddr_t offset = NULL; + xlog_rec_header_t *head = NULL; + int error = 0; + int smallmem = 0; + int num_blks = *last_blk - start_blk; + int xhdrs; + + ASSERT(start_blk != 0 || *last_blk != start_blk); + + if (!(bp = xlog_get_bp(log, num_blks))) { + if (!(bp = xlog_get_bp(log, 1))) + return ENOMEM; + smallmem = 1; + } else { + if ((error = xlog_bread(log, start_blk, num_blks, bp))) + goto out; + offset = xlog_align(log, start_blk, num_blks, bp); + offset += ((num_blks - 1) << BBSHIFT); + } + + for (i = (*last_blk) - 1; i >= 0; i--) { + if (i < start_blk) { + /* valid log record not found */ + xlog_warn( + "XFS: Log inconsistent (didn't find previous header)"); + ASSERT(0); + error = XFS_ERROR(EIO); + goto out; + } + + if (smallmem) { + if ((error = xlog_bread(log, i, 1, bp))) + goto out; + offset = xlog_align(log, i, 1, bp); + } + + head = (xlog_rec_header_t *)offset; + + if (XLOG_HEADER_MAGIC_NUM == + INT_GET(head->h_magicno, ARCH_CONVERT)) + break; + + if (!smallmem) + offset -= BBSIZE; + } + + /* + * We hit the beginning of the physical log & still no header. Return + * to caller. If caller can handle a return of -1, then this routine + * will be called again for the end of the physical log. + */ + if (i == -1) { + error = -1; + goto out; + } + + /* + * We have the final block of the good log (the first block + * of the log record _before_ the head. So we check the uuid. + */ + if ((error = xlog_header_check_mount(log->l_mp, head))) + goto out; + + /* + * We may have found a log record header before we expected one. + * last_blk will be the 1st block # with a given cycle #. We may end + * up reading an entire log record. In this case, we don't want to + * reset last_blk. Only when last_blk points in the middle of a log + * record do we update last_blk. + */ + if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) { + uint h_size = INT_GET(head->h_size, ARCH_CONVERT); + + xhdrs = h_size / XLOG_HEADER_CYCLE_SIZE; + if (h_size % XLOG_HEADER_CYCLE_SIZE) + xhdrs++; + } else { + xhdrs = 1; + } + + if (*last_blk - i + extra_bblks + != BTOBB(INT_GET(head->h_len, ARCH_CONVERT)) + xhdrs) + *last_blk = i; + +out: + xlog_put_bp(bp); + return error; +} + +/* + * Head is defined to be the point of the log where the next log write + * write could go. This means that incomplete LR writes at the end are + * eliminated when calculating the head. We aren't guaranteed that previous + * LR have complete transactions. We only know that a cycle number of + * current cycle number -1 won't be present in the log if we start writing + * from our current block number. + * + * last_blk contains the block number of the first block with a given + * cycle number. + * + * Return: zero if normal, non-zero if error. + */ +int +xlog_find_head( + xlog_t *log, + xfs_daddr_t *return_head_blk) +{ + xfs_buf_t *bp; + xfs_caddr_t offset; + xfs_daddr_t new_blk, first_blk, start_blk, last_blk, head_blk; + int num_scan_bblks; + uint first_half_cycle, last_half_cycle; + uint stop_on_cycle; + int error, log_bbnum = log->l_logBBsize; + + /* Is the end of the log device zeroed? */ + if ((error = xlog_find_zeroed(log, &first_blk)) == -1) { + *return_head_blk = first_blk; + + /* Is the whole lot zeroed? */ + if (!first_blk) { + /* Linux XFS shouldn't generate totally zeroed logs - + * mkfs etc write a dummy unmount record to a fresh + * log so we can store the uuid in there + */ + xlog_warn("XFS: totally zeroed log"); + } + + return 0; + } else if (error) { + xlog_warn("XFS: empty log check failed"); + return error; + } + + first_blk = 0; /* get cycle # of 1st block */ + bp = xlog_get_bp(log, 1); + if (!bp) + return ENOMEM; + if ((error = xlog_bread(log, 0, 1, bp))) + goto bp_err; + offset = xlog_align(log, 0, 1, bp); + first_half_cycle = GET_CYCLE(offset, ARCH_CONVERT); + + last_blk = head_blk = log_bbnum - 1; /* get cycle # of last block */ + if ((error = xlog_bread(log, last_blk, 1, bp))) + goto bp_err; + offset = xlog_align(log, last_blk, 1, bp); + last_half_cycle = GET_CYCLE(offset, ARCH_CONVERT); + ASSERT(last_half_cycle != 0); + + /* + * If the 1st half cycle number is equal to the last half cycle number, + * then the entire log is stamped with the same cycle number. In this + * case, head_blk can't be set to zero (which makes sense). The below + * math doesn't work out properly with head_blk equal to zero. Instead, + * we set it to log_bbnum which is an invalid block number, but this + * value makes the math correct. If head_blk doesn't changed through + * all the tests below, *head_blk is set to zero at the very end rather + * than log_bbnum. In a sense, log_bbnum and zero are the same block + * in a circular file. + */ + if (first_half_cycle == last_half_cycle) { + /* + * In this case we believe that the entire log should have + * cycle number last_half_cycle. We need to scan backwards + * from the end verifying that there are no holes still + * containing last_half_cycle - 1. If we find such a hole, + * then the start of that hole will be the new head. The + * simple case looks like + * x | x ... | x - 1 | x + * Another case that fits this picture would be + * x | x + 1 | x ... | x + * In this case the head really is somwhere at the end of the + * log, as one of the latest writes at the beginning was + * incomplete. + * One more case is + * x | x + 1 | x ... | x - 1 | x + * This is really the combination of the above two cases, and + * the head has to end up at the start of the x-1 hole at the + * end of the log. + * + * In the 256k log case, we will read from the beginning to the + * end of the log and search for cycle numbers equal to x-1. + * We don't worry about the x+1 blocks that we encounter, + * because we know that they cannot be the head since the log + * started with x. + */ + head_blk = log_bbnum; + stop_on_cycle = last_half_cycle - 1; + } else { + /* + * In this case we want to find the first block with cycle + * number matching last_half_cycle. We expect the log to be + * some variation on + * x + 1 ... | x ... + * The first block with cycle number x (last_half_cycle) will + * be where the new head belongs. First we do a binary search + * for the first occurrence of last_half_cycle. The binary + * search may not be totally accurate, so then we scan back + * from there looking for occurrences of last_half_cycle before + * us. If that backwards scan wraps around the beginning of + * the log, then we look for occurrences of last_half_cycle - 1 + * at the end of the log. The cases we're looking for look + * like + * x + 1 ... | x | x + 1 | x ... + * ^ binary search stopped here + * or + * x + 1 ... | x ... | x - 1 | x + * <---------> less than scan distance + */ + stop_on_cycle = last_half_cycle; + if ((error = xlog_find_cycle_start(log, bp, first_blk, + &head_blk, last_half_cycle))) + goto bp_err; + } + + /* + * Now validate the answer. Scan back some number of maximum possible + * blocks and make sure each one has the expected cycle number. The + * maximum is determined by the total possible amount of buffering + * in the in-core log. The following number can be made tighter if + * we actually look at the block size of the filesystem. + */ + num_scan_bblks = XLOG_TOTAL_REC_SHIFT(log); + if (head_blk >= num_scan_bblks) { + /* + * We are guaranteed that the entire check can be performed + * in one buffer. + */ + start_blk = head_blk - num_scan_bblks; + if ((error = xlog_find_verify_cycle(log, + start_blk, num_scan_bblks, + stop_on_cycle, &new_blk))) + goto bp_err; + if (new_blk != -1) + head_blk = new_blk; + } else { /* need to read 2 parts of log */ + /* + * We are going to scan backwards in the log in two parts. + * First we scan the physical end of the log. In this part + * of the log, we are looking for blocks with cycle number + * last_half_cycle - 1. + * If we find one, then we know that the log starts there, as + * we've found a hole that didn't get written in going around + * the end of the physical log. The simple case for this is + * x + 1 ... | x ... | x - 1 | x + * <---------> less than scan distance + * If all of the blocks at the end of the log have cycle number + * last_half_cycle, then we check the blocks at the start of + * the log looking for occurrences of last_half_cycle. If we + * find one, then our current estimate for the location of the + * first occurrence of last_half_cycle is wrong and we move + * back to the hole we've found. This case looks like + * x + 1 ... | x | x + 1 | x ... + * ^ binary search stopped here + * Another case we need to handle that only occurs in 256k + * logs is + * x + 1 ... | x ... | x+1 | x ... + * ^ binary search stops here + * In a 256k log, the scan at the end of the log will see the + * x + 1 blocks. We need to skip past those since that is + * certainly not the head of the log. By searching for + * last_half_cycle-1 we accomplish that. + */ + start_blk = log_bbnum - num_scan_bblks + head_blk; + ASSERT(head_blk <= INT_MAX && + (xfs_daddr_t) num_scan_bblks - head_blk >= 0); + if ((error = xlog_find_verify_cycle(log, start_blk, + num_scan_bblks - (int)head_blk, + (stop_on_cycle - 1), &new_blk))) + goto bp_err; + if (new_blk != -1) { + head_blk = new_blk; + goto bad_blk; + } + + /* + * Scan beginning of log now. The last part of the physical + * log is good. This scan needs to verify that it doesn't find + * the last_half_cycle. + */ + start_blk = 0; + ASSERT(head_blk <= INT_MAX); + if ((error = xlog_find_verify_cycle(log, + start_blk, (int)head_blk, + stop_on_cycle, &new_blk))) + goto bp_err; + if (new_blk != -1) + head_blk = new_blk; + } + + bad_blk: + /* + * Now we need to make sure head_blk is not pointing to a block in + * the middle of a log record. + */ + num_scan_bblks = XLOG_REC_SHIFT(log); + if (head_blk >= num_scan_bblks) { + start_blk = head_blk - num_scan_bblks; /* don't read head_blk */ + + /* start ptr at last block ptr before head_blk */ + if ((error = xlog_find_verify_log_record(log, start_blk, + &head_blk, 0)) == -1) { + error = XFS_ERROR(EIO); + goto bp_err; + } else if (error) + goto bp_err; + } else { + start_blk = 0; + ASSERT(head_blk <= INT_MAX); + if ((error = xlog_find_verify_log_record(log, start_blk, + &head_blk, 0)) == -1) { + /* We hit the beginning of the log during our search */ + start_blk = log_bbnum - num_scan_bblks + head_blk; + new_blk = log_bbnum; + ASSERT(start_blk <= INT_MAX && + (xfs_daddr_t) log_bbnum-start_blk >= 0); + ASSERT(head_blk <= INT_MAX); + if ((error = xlog_find_verify_log_record(log, + start_blk, &new_blk, + (int)head_blk)) == -1) { + error = XFS_ERROR(EIO); + goto bp_err; + } else if (error) + goto bp_err; + if (new_blk != log_bbnum) + head_blk = new_blk; + } else if (error) + goto bp_err; + } + + xlog_put_bp(bp); + if (head_blk == log_bbnum) + *return_head_blk = 0; + else + *return_head_blk = head_blk; + /* + * When returning here, we have a good block number. Bad block + * means that during a previous crash, we didn't have a clean break + * from cycle number N to cycle number N-1. In this case, we need + * to find the first block with cycle number N-1. + */ + return 0; + + bp_err: + xlog_put_bp(bp); + + if (error) + xlog_warn("XFS: failed to find log head"); + return error; +} + +/* + * Find the sync block number or the tail of the log. + * + * This will be the block number of the last record to have its + * associated buffers synced to disk. Every log record header has + * a sync lsn embedded in it. LSNs hold block numbers, so it is easy + * to get a sync block number. The only concern is to figure out which + * log record header to believe. + * + * The following algorithm uses the log record header with the largest + * lsn. The entire log record does not need to be valid. We only care + * that the header is valid. + * + * We could speed up search by using current head_blk buffer, but it is not + * available. + */ +int +xlog_find_tail( + xlog_t *log, + xfs_daddr_t *head_blk, + xfs_daddr_t *tail_blk, + int readonly) +{ + xlog_rec_header_t *rhead; + xlog_op_header_t *op_head; + xfs_caddr_t offset = NULL; + xfs_buf_t *bp; + int error, i, found; + xfs_daddr_t umount_data_blk; + xfs_daddr_t after_umount_blk; + xfs_lsn_t tail_lsn; + int hblks; + + found = 0; + + /* + * Find previous log record + */ + if ((error = xlog_find_head(log, head_blk))) + return error; + + bp = xlog_get_bp(log, 1); + if (!bp) + return ENOMEM; + if (*head_blk == 0) { /* special case */ + if ((error = xlog_bread(log, 0, 1, bp))) + goto bread_err; + offset = xlog_align(log, 0, 1, bp); + if (GET_CYCLE(offset, ARCH_CONVERT) == 0) { + *tail_blk = 0; + /* leave all other log inited values alone */ + goto exit; + } + } + + /* + * Search backwards looking for log record header block + */ + ASSERT(*head_blk < INT_MAX); + for (i = (int)(*head_blk) - 1; i >= 0; i--) { + if ((error = xlog_bread(log, i, 1, bp))) + goto bread_err; + offset = xlog_align(log, i, 1, bp); + if (XLOG_HEADER_MAGIC_NUM == + INT_GET(*(uint *)offset, ARCH_CONVERT)) { + found = 1; + break; + } + } + /* + * If we haven't found the log record header block, start looking + * again from the end of the physical log. XXXmiken: There should be + * a check here to make sure we didn't search more than N blocks in + * the previous code. + */ + if (!found) { + for (i = log->l_logBBsize - 1; i >= (int)(*head_blk); i--) { + if ((error = xlog_bread(log, i, 1, bp))) + goto bread_err; + offset = xlog_align(log, i, 1, bp); + if (XLOG_HEADER_MAGIC_NUM == + INT_GET(*(uint*)offset, ARCH_CONVERT)) { + found = 2; + break; + } + } + } + if (!found) { + xlog_warn("XFS: xlog_find_tail: couldn't find sync record"); + ASSERT(0); + return XFS_ERROR(EIO); + } + + /* find blk_no of tail of log */ + rhead = (xlog_rec_header_t *)offset; + *tail_blk = BLOCK_LSN(INT_GET(rhead->h_tail_lsn, ARCH_CONVERT)); + + /* + * Reset log values according to the state of the log when we + * crashed. In the case where head_blk == 0, we bump curr_cycle + * one because the next write starts a new cycle rather than + * continuing the cycle of the last good log record. At this + * point we have guaranteed that all partial log records have been + * accounted for. Therefore, we know that the last good log record + * written was complete and ended exactly on the end boundary + * of the physical log. + */ + log->l_prev_block = i; + log->l_curr_block = (int)*head_blk; + log->l_curr_cycle = INT_GET(rhead->h_cycle, ARCH_CONVERT); + if (found == 2) + log->l_curr_cycle++; + log->l_tail_lsn = INT_GET(rhead->h_tail_lsn, ARCH_CONVERT); + log->l_last_sync_lsn = INT_GET(rhead->h_lsn, ARCH_CONVERT); + log->l_grant_reserve_cycle = log->l_curr_cycle; + log->l_grant_reserve_bytes = BBTOB(log->l_curr_block); + log->l_grant_write_cycle = log->l_curr_cycle; + log->l_grant_write_bytes = BBTOB(log->l_curr_block); + + /* + * Look for unmount record. If we find it, then we know there + * was a clean unmount. Since 'i' could be the last block in + * the physical log, we convert to a log block before comparing + * to the head_blk. + * + * Save the current tail lsn to use to pass to + * xlog_clear_stale_blocks() below. We won't want to clear the + * unmount record if there is one, so we pass the lsn of the + * unmount record rather than the block after it. + */ + if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) { + int h_size = INT_GET(rhead->h_size, ARCH_CONVERT); + int h_version = INT_GET(rhead->h_version, ARCH_CONVERT); + + if ((h_version & XLOG_VERSION_2) && + (h_size > XLOG_HEADER_CYCLE_SIZE)) { + hblks = h_size / XLOG_HEADER_CYCLE_SIZE; + if (h_size % XLOG_HEADER_CYCLE_SIZE) + hblks++; + } else { + hblks = 1; + } + } else { + hblks = 1; + } + after_umount_blk = (i + hblks + (int) + BTOBB(INT_GET(rhead->h_len, ARCH_CONVERT))) % log->l_logBBsize; + tail_lsn = log->l_tail_lsn; + if (*head_blk == after_umount_blk && + INT_GET(rhead->h_num_logops, ARCH_CONVERT) == 1) { + umount_data_blk = (i + hblks) % log->l_logBBsize; + if ((error = xlog_bread(log, umount_data_blk, 1, bp))) { + goto bread_err; + } + offset = xlog_align(log, umount_data_blk, 1, bp); + op_head = (xlog_op_header_t *)offset; + if (op_head->oh_flags & XLOG_UNMOUNT_TRANS) { + /* + * Set tail and last sync so that newly written + * log records will point recovery to after the + * current unmount record. + */ + ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, log->l_curr_cycle, + after_umount_blk); + ASSIGN_ANY_LSN_HOST(log->l_last_sync_lsn, log->l_curr_cycle, + after_umount_blk); + *tail_blk = after_umount_blk; + } + } + + /* + * Make sure that there are no blocks in front of the head + * with the same cycle number as the head. This can happen + * because we allow multiple outstanding log writes concurrently, + * and the later writes might make it out before earlier ones. + * + * We use the lsn from before modifying it so that we'll never + * overwrite the unmount record after a clean unmount. + * + * Do this only if we are going to recover the filesystem + * + * NOTE: This used to say "if (!readonly)" + * However on Linux, we can & do recover a read-only filesystem. + * We only skip recovery if NORECOVERY is specified on mount, + * in which case we would not be here. + * + * But... if the -device- itself is readonly, just skip this. + * We can't recover this device anyway, so it won't matter. + */ + if (!xfs_readonly_buftarg(log->l_mp->m_logdev_targp)) { + error = xlog_clear_stale_blocks(log, tail_lsn); + } + +bread_err: +exit: + xlog_put_bp(bp); + + if (error) + xlog_warn("XFS: failed to locate log tail"); + return error; +} + +/* + * Is the log zeroed at all? + * + * The last binary search should be changed to perform an X block read + * once X becomes small enough. You can then search linearly through + * the X blocks. This will cut down on the number of reads we need to do. + * + * If the log is partially zeroed, this routine will pass back the blkno + * of the first block with cycle number 0. It won't have a complete LR + * preceding it. + * + * Return: + * 0 => the log is completely written to + * -1 => use *blk_no as the first block of the log + * >0 => error has occurred + */ +int +xlog_find_zeroed( + xlog_t *log, + xfs_daddr_t *blk_no) +{ + xfs_buf_t *bp; + xfs_caddr_t offset; + uint first_cycle, last_cycle; + xfs_daddr_t new_blk, last_blk, start_blk; + xfs_daddr_t num_scan_bblks; + int error, log_bbnum = log->l_logBBsize; + + /* check totally zeroed log */ + bp = xlog_get_bp(log, 1); + if (!bp) + return ENOMEM; + if ((error = xlog_bread(log, 0, 1, bp))) + goto bp_err; + offset = xlog_align(log, 0, 1, bp); + first_cycle = GET_CYCLE(offset, ARCH_CONVERT); + if (first_cycle == 0) { /* completely zeroed log */ + *blk_no = 0; + xlog_put_bp(bp); + return -1; + } + + /* check partially zeroed log */ + if ((error = xlog_bread(log, log_bbnum-1, 1, bp))) + goto bp_err; + offset = xlog_align(log, log_bbnum-1, 1, bp); + last_cycle = GET_CYCLE(offset, ARCH_CONVERT); + if (last_cycle != 0) { /* log completely written to */ + xlog_put_bp(bp); + return 0; + } else if (first_cycle != 1) { + /* + * If the cycle of the last block is zero, the cycle of + * the first block must be 1. If it's not, maybe we're + * not looking at a log... Bail out. + */ + xlog_warn("XFS: Log inconsistent or not a log (last==0, first!=1)"); + return XFS_ERROR(EINVAL); + } + + /* we have a partially zeroed log */ + last_blk = log_bbnum-1; + if ((error = xlog_find_cycle_start(log, bp, 0, &last_blk, 0))) + goto bp_err; + + /* + * Validate the answer. Because there is no way to guarantee that + * the entire log is made up of log records which are the same size, + * we scan over the defined maximum blocks. At this point, the maximum + * is not chosen to mean anything special. XXXmiken + */ + num_scan_bblks = XLOG_TOTAL_REC_SHIFT(log); + ASSERT(num_scan_bblks <= INT_MAX); + + if (last_blk < num_scan_bblks) + num_scan_bblks = last_blk; + start_blk = last_blk - num_scan_bblks; + + /* + * We search for any instances of cycle number 0 that occur before + * our current estimate of the head. What we're trying to detect is + * 1 ... | 0 | 1 | 0... + * ^ binary search ends here + */ + if ((error = xlog_find_verify_cycle(log, start_blk, + (int)num_scan_bblks, 0, &new_blk))) + goto bp_err; + if (new_blk != -1) + last_blk = new_blk; + + /* + * Potentially backup over partial log record write. We don't need + * to search the end of the log because we know it is zero. + */ + if ((error = xlog_find_verify_log_record(log, start_blk, + &last_blk, 0)) == -1) { + error = XFS_ERROR(EIO); + goto bp_err; + } else if (error) + goto bp_err; + + *blk_no = last_blk; +bp_err: + xlog_put_bp(bp); + if (error) + return error; + return -1; +} + +/* + * These are simple subroutines used by xlog_clear_stale_blocks() below + * to initialize a buffer full of empty log record headers and write + * them into the log. + */ +STATIC void +xlog_add_record( + xlog_t *log, + xfs_caddr_t buf, + int cycle, + int block, + int tail_cycle, + int tail_block) +{ + xlog_rec_header_t *recp = (xlog_rec_header_t *)buf; + + memset(buf, 0, BBSIZE); + INT_SET(recp->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); + INT_SET(recp->h_cycle, ARCH_CONVERT, cycle); + INT_SET(recp->h_version, ARCH_CONVERT, + XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); + ASSIGN_ANY_LSN_DISK(recp->h_lsn, cycle, block); + ASSIGN_ANY_LSN_DISK(recp->h_tail_lsn, tail_cycle, tail_block); + INT_SET(recp->h_fmt, ARCH_CONVERT, XLOG_FMT); + memcpy(&recp->h_fs_uuid, &log->l_mp->m_sb.sb_uuid, sizeof(uuid_t)); +} + +STATIC int +xlog_write_log_records( + xlog_t *log, + int cycle, + int start_block, + int blocks, + int tail_cycle, + int tail_block) +{ + xfs_caddr_t offset; + xfs_buf_t *bp; + int balign, ealign; + int sectbb = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1); + int end_block = start_block + blocks; + int bufblks; + int error = 0; + int i, j = 0; + + bufblks = 1 << ffs(blocks); + while (!(bp = xlog_get_bp(log, bufblks))) { + bufblks >>= 1; + if (bufblks <= log->l_sectbb_log) + return ENOMEM; + } + + /* We may need to do a read at the start to fill in part of + * the buffer in the starting sector not covered by the first + * write below. + */ + balign = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, start_block); + if (balign != start_block) { + if ((error = xlog_bread(log, start_block, 1, bp))) { + xlog_put_bp(bp); + return error; + } + j = start_block - balign; + } + + for (i = start_block; i < end_block; i += bufblks) { + int bcount, endcount; + + bcount = min(bufblks, end_block - start_block); + endcount = bcount - j; + + /* We may need to do a read at the end to fill in part of + * the buffer in the final sector not covered by the write. + * If this is the same sector as the above read, skip it. + */ + ealign = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, end_block); + if (j == 0 && (start_block + endcount > ealign)) { + offset = XFS_BUF_PTR(bp); + balign = BBTOB(ealign - start_block); + XFS_BUF_SET_PTR(bp, offset + balign, BBTOB(sectbb)); + if ((error = xlog_bread(log, ealign, sectbb, bp))) + break; + XFS_BUF_SET_PTR(bp, offset, bufblks); + } + + offset = xlog_align(log, start_block, endcount, bp); + for (; j < endcount; j++) { + xlog_add_record(log, offset, cycle, i+j, + tail_cycle, tail_block); + offset += BBSIZE; + } + error = xlog_bwrite(log, start_block, endcount, bp); + if (error) + break; + start_block += endcount; + j = 0; + } + xlog_put_bp(bp); + return error; +} + +/* + * This routine is called to blow away any incomplete log writes out + * in front of the log head. We do this so that we won't become confused + * if we come up, write only a little bit more, and then crash again. + * If we leave the partial log records out there, this situation could + * cause us to think those partial writes are valid blocks since they + * have the current cycle number. We get rid of them by overwriting them + * with empty log records with the old cycle number rather than the + * current one. + * + * The tail lsn is passed in rather than taken from + * the log so that we will not write over the unmount record after a + * clean unmount in a 512 block log. Doing so would leave the log without + * any valid log records in it until a new one was written. If we crashed + * during that time we would not be able to recover. + */ +STATIC int +xlog_clear_stale_blocks( + xlog_t *log, + xfs_lsn_t tail_lsn) +{ + int tail_cycle, head_cycle; + int tail_block, head_block; + int tail_distance, max_distance; + int distance; + int error; + + tail_cycle = CYCLE_LSN(tail_lsn); + tail_block = BLOCK_LSN(tail_lsn); + head_cycle = log->l_curr_cycle; + head_block = log->l_curr_block; + + /* + * Figure out the distance between the new head of the log + * and the tail. We want to write over any blocks beyond the + * head that we may have written just before the crash, but + * we don't want to overwrite the tail of the log. + */ + if (head_cycle == tail_cycle) { + /* + * The tail is behind the head in the physical log, + * so the distance from the head to the tail is the + * distance from the head to the end of the log plus + * the distance from the beginning of the log to the + * tail. + */ + if (unlikely(head_block < tail_block || head_block >= log->l_logBBsize)) { + XFS_ERROR_REPORT("xlog_clear_stale_blocks(1)", + XFS_ERRLEVEL_LOW, log->l_mp); + return XFS_ERROR(EFSCORRUPTED); + } + tail_distance = tail_block + (log->l_logBBsize - head_block); + } else { + /* + * The head is behind the tail in the physical log, + * so the distance from the head to the tail is just + * the tail block minus the head block. + */ + if (unlikely(head_block >= tail_block || head_cycle != (tail_cycle + 1))){ + XFS_ERROR_REPORT("xlog_clear_stale_blocks(2)", + XFS_ERRLEVEL_LOW, log->l_mp); + return XFS_ERROR(EFSCORRUPTED); + } + tail_distance = tail_block - head_block; + } + + /* + * If the head is right up against the tail, we can't clear + * anything. + */ + if (tail_distance <= 0) { + ASSERT(tail_distance == 0); + return 0; + } + + max_distance = XLOG_TOTAL_REC_SHIFT(log); + /* + * Take the smaller of the maximum amount of outstanding I/O + * we could have and the distance to the tail to clear out. + * We take the smaller so that we don't overwrite the tail and + * we don't waste all day writing from the head to the tail + * for no reason. + */ + max_distance = MIN(max_distance, tail_distance); + + if ((head_block + max_distance) <= log->l_logBBsize) { + /* + * We can stomp all the blocks we need to without + * wrapping around the end of the log. Just do it + * in a single write. Use the cycle number of the + * current cycle minus one so that the log will look like: + * n ... | n - 1 ... + */ + error = xlog_write_log_records(log, (head_cycle - 1), + head_block, max_distance, tail_cycle, + tail_block); + if (error) + return error; + } else { + /* + * We need to wrap around the end of the physical log in + * order to clear all the blocks. Do it in two separate + * I/Os. The first write should be from the head to the + * end of the physical log, and it should use the current + * cycle number minus one just like above. + */ + distance = log->l_logBBsize - head_block; + error = xlog_write_log_records(log, (head_cycle - 1), + head_block, distance, tail_cycle, + tail_block); + + if (error) + return error; + + /* + * Now write the blocks at the start of the physical log. + * This writes the remainder of the blocks we want to clear. + * It uses the current cycle number since we're now on the + * same cycle as the head so that we get: + * n ... n ... | n - 1 ... + * ^^^^^ blocks we're writing + */ + distance = max_distance - (log->l_logBBsize - head_block); + error = xlog_write_log_records(log, head_cycle, 0, distance, + tail_cycle, tail_block); + if (error) + return error; + } + + return 0; +} + +/****************************************************************************** + * + * Log recover routines + * + ****************************************************************************** + */ + +STATIC xlog_recover_t * +xlog_recover_find_tid( + xlog_recover_t *q, + xlog_tid_t tid) +{ + xlog_recover_t *p = q; + + while (p != NULL) { + if (p->r_log_tid == tid) + break; + p = p->r_next; + } + return p; +} + +STATIC void +xlog_recover_put_hashq( + xlog_recover_t **q, + xlog_recover_t *trans) +{ + trans->r_next = *q; + *q = trans; +} + +STATIC void +xlog_recover_add_item( + xlog_recover_item_t **itemq) +{ + xlog_recover_item_t *item; + + item = kmem_zalloc(sizeof(xlog_recover_item_t), KM_SLEEP); + xlog_recover_insert_item_backq(itemq, item); +} + +STATIC int +xlog_recover_add_to_cont_trans( + xlog_recover_t *trans, + xfs_caddr_t dp, + int len) +{ + xlog_recover_item_t *item; + xfs_caddr_t ptr, old_ptr; + int old_len; + + item = trans->r_itemq; + if (item == 0) { + /* finish copying rest of trans header */ + xlog_recover_add_item(&trans->r_itemq); + ptr = (xfs_caddr_t) &trans->r_theader + + sizeof(xfs_trans_header_t) - len; + memcpy(ptr, dp, len); /* d, s, l */ + return 0; + } + item = item->ri_prev; + + old_ptr = item->ri_buf[item->ri_cnt-1].i_addr; + old_len = item->ri_buf[item->ri_cnt-1].i_len; + + ptr = kmem_realloc(old_ptr, len+old_len, old_len, 0); + memcpy(&ptr[old_len], dp, len); /* d, s, l */ + item->ri_buf[item->ri_cnt-1].i_len += len; + item->ri_buf[item->ri_cnt-1].i_addr = ptr; + return 0; +} + +/* + * The next region to add is the start of a new region. It could be + * a whole region or it could be the first part of a new region. Because + * of this, the assumption here is that the type and size fields of all + * format structures fit into the first 32 bits of the structure. + * + * This works because all regions must be 32 bit aligned. Therefore, we + * either have both fields or we have neither field. In the case we have + * neither field, the data part of the region is zero length. We only have + * a log_op_header and can throw away the header since a new one will appear + * later. If we have at least 4 bytes, then we can determine how many regions + * will appear in the current log item. + */ +STATIC int +xlog_recover_add_to_trans( + xlog_recover_t *trans, + xfs_caddr_t dp, + int len) +{ + xfs_inode_log_format_t *in_f; /* any will do */ + xlog_recover_item_t *item; + xfs_caddr_t ptr; + + if (!len) + return 0; + item = trans->r_itemq; + if (item == 0) { + ASSERT(*(uint *)dp == XFS_TRANS_HEADER_MAGIC); + if (len == sizeof(xfs_trans_header_t)) + xlog_recover_add_item(&trans->r_itemq); + memcpy(&trans->r_theader, dp, len); /* d, s, l */ + return 0; + } + + ptr = kmem_alloc(len, KM_SLEEP); + memcpy(ptr, dp, len); + in_f = (xfs_inode_log_format_t *)ptr; + + if (item->ri_prev->ri_total != 0 && + item->ri_prev->ri_total == item->ri_prev->ri_cnt) { + xlog_recover_add_item(&trans->r_itemq); + } + item = trans->r_itemq; + item = item->ri_prev; + + if (item->ri_total == 0) { /* first region to be added */ + item->ri_total = in_f->ilf_size; + ASSERT(item->ri_total <= XLOG_MAX_REGIONS_IN_ITEM); + item->ri_buf = kmem_zalloc((item->ri_total * + sizeof(xfs_log_iovec_t)), KM_SLEEP); + } + ASSERT(item->ri_total > item->ri_cnt); + /* Description region is ri_buf[0] */ + item->ri_buf[item->ri_cnt].i_addr = ptr; + item->ri_buf[item->ri_cnt].i_len = len; + item->ri_cnt++; + return 0; +} + +STATIC void +xlog_recover_new_tid( + xlog_recover_t **q, + xlog_tid_t tid, + xfs_lsn_t lsn) +{ + xlog_recover_t *trans; + + trans = kmem_zalloc(sizeof(xlog_recover_t), KM_SLEEP); + trans->r_log_tid = tid; + trans->r_lsn = lsn; + xlog_recover_put_hashq(q, trans); +} + +STATIC int +xlog_recover_unlink_tid( + xlog_recover_t **q, + xlog_recover_t *trans) +{ + xlog_recover_t *tp; + int found = 0; + + ASSERT(trans != 0); + if (trans == *q) { + *q = (*q)->r_next; + } else { + tp = *q; + while (tp != 0) { + if (tp->r_next == trans) { + found = 1; + break; + } + tp = tp->r_next; + } + if (!found) { + xlog_warn( + "XFS: xlog_recover_unlink_tid: trans not found"); + ASSERT(0); + return XFS_ERROR(EIO); + } + tp->r_next = tp->r_next->r_next; + } + return 0; +} + +STATIC void +xlog_recover_insert_item_backq( + xlog_recover_item_t **q, + xlog_recover_item_t *item) +{ + if (*q == 0) { + item->ri_prev = item->ri_next = item; + *q = item; + } else { + item->ri_next = *q; + item->ri_prev = (*q)->ri_prev; + (*q)->ri_prev = item; + item->ri_prev->ri_next = item; + } +} + +STATIC void +xlog_recover_insert_item_frontq( + xlog_recover_item_t **q, + xlog_recover_item_t *item) +{ + xlog_recover_insert_item_backq(q, item); + *q = item; +} + +STATIC int +xlog_recover_reorder_trans( + xlog_t *log, + xlog_recover_t *trans) +{ + xlog_recover_item_t *first_item, *itemq, *itemq_next; + xfs_buf_log_format_t *buf_f; + xfs_buf_log_format_v1_t *obuf_f; + ushort flags = 0; + + first_item = itemq = trans->r_itemq; + trans->r_itemq = NULL; + do { + itemq_next = itemq->ri_next; + buf_f = (xfs_buf_log_format_t *)itemq->ri_buf[0].i_addr; + switch (ITEM_TYPE(itemq)) { + case XFS_LI_BUF: + flags = buf_f->blf_flags; + break; + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + obuf_f = (xfs_buf_log_format_v1_t*)buf_f; + flags = obuf_f->blf_flags; + break; + } + + switch (ITEM_TYPE(itemq)) { + case XFS_LI_BUF: + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + if (!(flags & XFS_BLI_CANCEL)) { + xlog_recover_insert_item_frontq(&trans->r_itemq, + itemq); + break; + } + case XFS_LI_INODE: + case XFS_LI_6_1_INODE: + case XFS_LI_5_3_INODE: + case XFS_LI_DQUOT: + case XFS_LI_QUOTAOFF: + case XFS_LI_EFD: + case XFS_LI_EFI: + xlog_recover_insert_item_backq(&trans->r_itemq, itemq); + break; + default: + xlog_warn( + "XFS: xlog_recover_reorder_trans: unrecognized type of log operation"); + ASSERT(0); + return XFS_ERROR(EIO); + } + itemq = itemq_next; + } while (first_item != itemq); + return 0; +} + +/* + * Build up the table of buf cancel records so that we don't replay + * cancelled data in the second pass. For buffer records that are + * not cancel records, there is nothing to do here so we just return. + * + * If we get a cancel record which is already in the table, this indicates + * that the buffer was cancelled multiple times. In order to ensure + * that during pass 2 we keep the record in the table until we reach its + * last occurrence in the log, we keep a reference count in the cancel + * record in the table to tell us how many times we expect to see this + * record during the second pass. + */ +STATIC void +xlog_recover_do_buffer_pass1( + xlog_t *log, + xfs_buf_log_format_t *buf_f) +{ + xfs_buf_cancel_t *bcp; + xfs_buf_cancel_t *nextp; + xfs_buf_cancel_t *prevp; + xfs_buf_cancel_t **bucket; + xfs_buf_log_format_v1_t *obuf_f; + xfs_daddr_t blkno = 0; + uint len = 0; + ushort flags = 0; + + switch (buf_f->blf_type) { + case XFS_LI_BUF: + blkno = buf_f->blf_blkno; + len = buf_f->blf_len; + flags = buf_f->blf_flags; + break; + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + obuf_f = (xfs_buf_log_format_v1_t*)buf_f; + blkno = (xfs_daddr_t) obuf_f->blf_blkno; + len = obuf_f->blf_len; + flags = obuf_f->blf_flags; + break; + } + + /* + * If this isn't a cancel buffer item, then just return. + */ + if (!(flags & XFS_BLI_CANCEL)) + return; + + /* + * Insert an xfs_buf_cancel record into the hash table of + * them. If there is already an identical record, bump + * its reference count. + */ + bucket = &log->l_buf_cancel_table[(__uint64_t)blkno % + XLOG_BC_TABLE_SIZE]; + /* + * If the hash bucket is empty then just insert a new record into + * the bucket. + */ + if (*bucket == NULL) { + bcp = (xfs_buf_cancel_t *)kmem_alloc(sizeof(xfs_buf_cancel_t), + KM_SLEEP); + bcp->bc_blkno = blkno; + bcp->bc_len = len; + bcp->bc_refcount = 1; + bcp->bc_next = NULL; + *bucket = bcp; + return; + } + + /* + * The hash bucket is not empty, so search for duplicates of our + * record. If we find one them just bump its refcount. If not + * then add us at the end of the list. + */ + prevp = NULL; + nextp = *bucket; + while (nextp != NULL) { + if (nextp->bc_blkno == blkno && nextp->bc_len == len) { + nextp->bc_refcount++; + return; + } + prevp = nextp; + nextp = nextp->bc_next; + } + ASSERT(prevp != NULL); + bcp = (xfs_buf_cancel_t *)kmem_alloc(sizeof(xfs_buf_cancel_t), + KM_SLEEP); + bcp->bc_blkno = blkno; + bcp->bc_len = len; + bcp->bc_refcount = 1; + bcp->bc_next = NULL; + prevp->bc_next = bcp; +} + +/* + * Check to see whether the buffer being recovered has a corresponding + * entry in the buffer cancel record table. If it does then return 1 + * so that it will be cancelled, otherwise return 0. If the buffer is + * actually a buffer cancel item (XFS_BLI_CANCEL is set), then decrement + * the refcount on the entry in the table and remove it from the table + * if this is the last reference. + * + * We remove the cancel record from the table when we encounter its + * last occurrence in the log so that if the same buffer is re-used + * again after its last cancellation we actually replay the changes + * made at that point. + */ +STATIC int +xlog_check_buffer_cancelled( + xlog_t *log, + xfs_daddr_t blkno, + uint len, + ushort flags) +{ + xfs_buf_cancel_t *bcp; + xfs_buf_cancel_t *prevp; + xfs_buf_cancel_t **bucket; + + if (log->l_buf_cancel_table == NULL) { + /* + * There is nothing in the table built in pass one, + * so this buffer must not be cancelled. + */ + ASSERT(!(flags & XFS_BLI_CANCEL)); + return 0; + } + + bucket = &log->l_buf_cancel_table[(__uint64_t)blkno % + XLOG_BC_TABLE_SIZE]; + bcp = *bucket; + if (bcp == NULL) { + /* + * There is no corresponding entry in the table built + * in pass one, so this buffer has not been cancelled. + */ + ASSERT(!(flags & XFS_BLI_CANCEL)); + return 0; + } + + /* + * Search for an entry in the buffer cancel table that + * matches our buffer. + */ + prevp = NULL; + while (bcp != NULL) { + if (bcp->bc_blkno == blkno && bcp->bc_len == len) { + /* + * We've go a match, so return 1 so that the + * recovery of this buffer is cancelled. + * If this buffer is actually a buffer cancel + * log item, then decrement the refcount on the + * one in the table and remove it if this is the + * last reference. + */ + if (flags & XFS_BLI_CANCEL) { + bcp->bc_refcount--; + if (bcp->bc_refcount == 0) { + if (prevp == NULL) { + *bucket = bcp->bc_next; + } else { + prevp->bc_next = bcp->bc_next; + } + kmem_free(bcp, + sizeof(xfs_buf_cancel_t)); + } + } + return 1; + } + prevp = bcp; + bcp = bcp->bc_next; + } + /* + * We didn't find a corresponding entry in the table, so + * return 0 so that the buffer is NOT cancelled. + */ + ASSERT(!(flags & XFS_BLI_CANCEL)); + return 0; +} + +STATIC int +xlog_recover_do_buffer_pass2( + xlog_t *log, + xfs_buf_log_format_t *buf_f) +{ + xfs_buf_log_format_v1_t *obuf_f; + xfs_daddr_t blkno = 0; + ushort flags = 0; + uint len = 0; + + switch (buf_f->blf_type) { + case XFS_LI_BUF: + blkno = buf_f->blf_blkno; + flags = buf_f->blf_flags; + len = buf_f->blf_len; + break; + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + obuf_f = (xfs_buf_log_format_v1_t*)buf_f; + blkno = (xfs_daddr_t) obuf_f->blf_blkno; + flags = obuf_f->blf_flags; + len = (xfs_daddr_t) obuf_f->blf_len; + break; + } + + return xlog_check_buffer_cancelled(log, blkno, len, flags); +} + +/* + * Perform recovery for a buffer full of inodes. In these buffers, + * the only data which should be recovered is that which corresponds + * to the di_next_unlinked pointers in the on disk inode structures. + * The rest of the data for the inodes is always logged through the + * inodes themselves rather than the inode buffer and is recovered + * in xlog_recover_do_inode_trans(). + * + * The only time when buffers full of inodes are fully recovered is + * when the buffer is full of newly allocated inodes. In this case + * the buffer will not be marked as an inode buffer and so will be + * sent to xlog_recover_do_reg_buffer() below during recovery. + */ +STATIC int +xlog_recover_do_inode_buffer( + xfs_mount_t *mp, + xlog_recover_item_t *item, + xfs_buf_t *bp, + xfs_buf_log_format_t *buf_f) +{ + int i; + int item_index; + int bit; + int nbits; + int reg_buf_offset; + int reg_buf_bytes; + int next_unlinked_offset; + int inodes_per_buf; + xfs_agino_t *logged_nextp; + xfs_agino_t *buffer_nextp; + xfs_buf_log_format_v1_t *obuf_f; + unsigned int *data_map = NULL; + unsigned int map_size = 0; + + switch (buf_f->blf_type) { + case XFS_LI_BUF: + data_map = buf_f->blf_data_map; + map_size = buf_f->blf_map_size; + break; + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + obuf_f = (xfs_buf_log_format_v1_t*)buf_f; + data_map = obuf_f->blf_data_map; + map_size = obuf_f->blf_map_size; + break; + } + /* + * Set the variables corresponding to the current region to + * 0 so that we'll initialize them on the first pass through + * the loop. + */ + reg_buf_offset = 0; + reg_buf_bytes = 0; + bit = 0; + nbits = 0; + item_index = 0; + inodes_per_buf = XFS_BUF_COUNT(bp) >> mp->m_sb.sb_inodelog; + for (i = 0; i < inodes_per_buf; i++) { + next_unlinked_offset = (i * mp->m_sb.sb_inodesize) + + offsetof(xfs_dinode_t, di_next_unlinked); + + while (next_unlinked_offset >= + (reg_buf_offset + reg_buf_bytes)) { + /* + * The next di_next_unlinked field is beyond + * the current logged region. Find the next + * logged region that contains or is beyond + * the current di_next_unlinked field. + */ + bit += nbits; + bit = xfs_next_bit(data_map, map_size, bit); + + /* + * If there are no more logged regions in the + * buffer, then we're done. + */ + if (bit == -1) { + return 0; + } + + nbits = xfs_contig_bits(data_map, map_size, + bit); + ASSERT(nbits > 0); + reg_buf_offset = bit << XFS_BLI_SHIFT; + reg_buf_bytes = nbits << XFS_BLI_SHIFT; + item_index++; + } + + /* + * If the current logged region starts after the current + * di_next_unlinked field, then move on to the next + * di_next_unlinked field. + */ + if (next_unlinked_offset < reg_buf_offset) { + continue; + } + + ASSERT(item->ri_buf[item_index].i_addr != NULL); + ASSERT((item->ri_buf[item_index].i_len % XFS_BLI_CHUNK) == 0); + ASSERT((reg_buf_offset + reg_buf_bytes) <= XFS_BUF_COUNT(bp)); + + /* + * The current logged region contains a copy of the + * current di_next_unlinked field. Extract its value + * and copy it to the buffer copy. + */ + logged_nextp = (xfs_agino_t *) + ((char *)(item->ri_buf[item_index].i_addr) + + (next_unlinked_offset - reg_buf_offset)); + if (unlikely(*logged_nextp == 0)) { + xfs_fs_cmn_err(CE_ALERT, mp, + "bad inode buffer log record (ptr = 0x%p, bp = 0x%p). XFS trying to replay bad (0) inode di_next_unlinked field", + item, bp); + XFS_ERROR_REPORT("xlog_recover_do_inode_buf", + XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + + buffer_nextp = (xfs_agino_t *)xfs_buf_offset(bp, + next_unlinked_offset); + INT_SET(*buffer_nextp, ARCH_CONVERT, *logged_nextp); + } + + return 0; +} + +/* + * Perform a 'normal' buffer recovery. Each logged region of the + * buffer should be copied over the corresponding region in the + * given buffer. The bitmap in the buf log format structure indicates + * where to place the logged data. + */ +/*ARGSUSED*/ +STATIC void +xlog_recover_do_reg_buffer( + xfs_mount_t *mp, + xlog_recover_item_t *item, + xfs_buf_t *bp, + xfs_buf_log_format_t *buf_f) +{ + int i; + int bit; + int nbits; + xfs_buf_log_format_v1_t *obuf_f; + unsigned int *data_map = NULL; + unsigned int map_size = 0; + int error; + + switch (buf_f->blf_type) { + case XFS_LI_BUF: + data_map = buf_f->blf_data_map; + map_size = buf_f->blf_map_size; + break; + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + obuf_f = (xfs_buf_log_format_v1_t*)buf_f; + data_map = obuf_f->blf_data_map; + map_size = obuf_f->blf_map_size; + break; + } + bit = 0; + i = 1; /* 0 is the buf format structure */ + while (1) { + bit = xfs_next_bit(data_map, map_size, bit); + if (bit == -1) + break; + nbits = xfs_contig_bits(data_map, map_size, bit); + ASSERT(nbits > 0); + ASSERT(item->ri_buf[i].i_addr != 0); + ASSERT(item->ri_buf[i].i_len % XFS_BLI_CHUNK == 0); + ASSERT(XFS_BUF_COUNT(bp) >= + ((uint)bit << XFS_BLI_SHIFT)+(nbits<<XFS_BLI_SHIFT)); + + /* + * Do a sanity check if this is a dquot buffer. Just checking + * the first dquot in the buffer should do. XXXThis is + * probably a good thing to do for other buf types also. + */ + error = 0; + if (buf_f->blf_flags & (XFS_BLI_UDQUOT_BUF|XFS_BLI_GDQUOT_BUF)) { + error = xfs_qm_dqcheck((xfs_disk_dquot_t *) + item->ri_buf[i].i_addr, + -1, 0, XFS_QMOPT_DOWARN, + "dquot_buf_recover"); + } + if (!error) + memcpy(xfs_buf_offset(bp, + (uint)bit << XFS_BLI_SHIFT), /* dest */ + item->ri_buf[i].i_addr, /* source */ + nbits<<XFS_BLI_SHIFT); /* length */ + i++; + bit += nbits; + } + + /* Shouldn't be any more regions */ + ASSERT(i == item->ri_total); +} + +/* + * Do some primitive error checking on ondisk dquot data structures. + */ +int +xfs_qm_dqcheck( + xfs_disk_dquot_t *ddq, + xfs_dqid_t id, + uint type, /* used only when IO_dorepair is true */ + uint flags, + char *str) +{ + xfs_dqblk_t *d = (xfs_dqblk_t *)ddq; + int errs = 0; + + /* + * We can encounter an uninitialized dquot buffer for 2 reasons: + * 1. If we crash while deleting the quotainode(s), and those blks got + * used for user data. This is because we take the path of regular + * file deletion; however, the size field of quotainodes is never + * updated, so all the tricks that we play in itruncate_finish + * don't quite matter. + * + * 2. We don't play the quota buffers when there's a quotaoff logitem. + * But the allocation will be replayed so we'll end up with an + * uninitialized quota block. + * + * This is all fine; things are still consistent, and we haven't lost + * any quota information. Just don't complain about bad dquot blks. + */ + if (INT_GET(ddq->d_magic, ARCH_CONVERT) != XFS_DQUOT_MAGIC) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x", + str, id, + INT_GET(ddq->d_magic, ARCH_CONVERT), XFS_DQUOT_MAGIC); + errs++; + } + if (INT_GET(ddq->d_version, ARCH_CONVERT) != XFS_DQUOT_VERSION) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x", + str, id, + INT_GET(ddq->d_magic, ARCH_CONVERT), XFS_DQUOT_VERSION); + errs++; + } + + if (INT_GET(ddq->d_flags, ARCH_CONVERT) != XFS_DQ_USER && + INT_GET(ddq->d_flags, ARCH_CONVERT) != XFS_DQ_GROUP) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : XFS dquot ID 0x%x, unknown flags 0x%x", + str, id, INT_GET(ddq->d_flags, ARCH_CONVERT)); + errs++; + } + + if (id != -1 && id != INT_GET(ddq->d_id, ARCH_CONVERT)) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : ondisk-dquot 0x%p, ID mismatch: " + "0x%x expected, found id 0x%x", + str, ddq, id, INT_GET(ddq->d_id, ARCH_CONVERT)); + errs++; + } + + if (!errs && ddq->d_id) { + if (INT_GET(ddq->d_blk_softlimit, ARCH_CONVERT) && + INT_GET(ddq->d_bcount, ARCH_CONVERT) >= + INT_GET(ddq->d_blk_softlimit, ARCH_CONVERT)) { + if (!ddq->d_btimer) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : Dquot ID 0x%x (0x%p) " + "BLK TIMER NOT STARTED", + str, (int) + INT_GET(ddq->d_id, ARCH_CONVERT), ddq); + errs++; + } + } + if (INT_GET(ddq->d_ino_softlimit, ARCH_CONVERT) && + INT_GET(ddq->d_icount, ARCH_CONVERT) >= + INT_GET(ddq->d_ino_softlimit, ARCH_CONVERT)) { + if (!ddq->d_itimer) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : Dquot ID 0x%x (0x%p) " + "INODE TIMER NOT STARTED", + str, (int) + INT_GET(ddq->d_id, ARCH_CONVERT), ddq); + errs++; + } + } + if (INT_GET(ddq->d_rtb_softlimit, ARCH_CONVERT) && + INT_GET(ddq->d_rtbcount, ARCH_CONVERT) >= + INT_GET(ddq->d_rtb_softlimit, ARCH_CONVERT)) { + if (!ddq->d_rtbtimer) { + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_ALERT, + "%s : Dquot ID 0x%x (0x%p) " + "RTBLK TIMER NOT STARTED", + str, (int) + INT_GET(ddq->d_id, ARCH_CONVERT), ddq); + errs++; + } + } + } + + if (!errs || !(flags & XFS_QMOPT_DQREPAIR)) + return errs; + + if (flags & XFS_QMOPT_DOWARN) + cmn_err(CE_NOTE, "Re-initializing dquot ID 0x%x", id); + + /* + * Typically, a repair is only requested by quotacheck. + */ + ASSERT(id != -1); + ASSERT(flags & XFS_QMOPT_DQREPAIR); + memset(d, 0, sizeof(xfs_dqblk_t)); + INT_SET(d->dd_diskdq.d_magic, ARCH_CONVERT, XFS_DQUOT_MAGIC); + INT_SET(d->dd_diskdq.d_version, ARCH_CONVERT, XFS_DQUOT_VERSION); + INT_SET(d->dd_diskdq.d_id, ARCH_CONVERT, id); + INT_SET(d->dd_diskdq.d_flags, ARCH_CONVERT, type); + + return errs; +} + +/* + * Perform a dquot buffer recovery. + * Simple algorithm: if we have found a QUOTAOFF logitem of the same type + * (ie. USR or GRP), then just toss this buffer away; don't recover it. + * Else, treat it as a regular buffer and do recovery. + */ +STATIC void +xlog_recover_do_dquot_buffer( + xfs_mount_t *mp, + xlog_t *log, + xlog_recover_item_t *item, + xfs_buf_t *bp, + xfs_buf_log_format_t *buf_f) +{ + uint type; + + /* + * Filesystems are required to send in quota flags at mount time. + */ + if (mp->m_qflags == 0) { + return; + } + + type = 0; + if (buf_f->blf_flags & XFS_BLI_UDQUOT_BUF) + type |= XFS_DQ_USER; + if (buf_f->blf_flags & XFS_BLI_GDQUOT_BUF) + type |= XFS_DQ_GROUP; + /* + * This type of quotas was turned off, so ignore this buffer + */ + if (log->l_quotaoffs_flag & type) + return; + + xlog_recover_do_reg_buffer(mp, item, bp, buf_f); +} + +/* + * This routine replays a modification made to a buffer at runtime. + * There are actually two types of buffer, regular and inode, which + * are handled differently. Inode buffers are handled differently + * in that we only recover a specific set of data from them, namely + * the inode di_next_unlinked fields. This is because all other inode + * data is actually logged via inode records and any data we replay + * here which overlaps that may be stale. + * + * When meta-data buffers are freed at run time we log a buffer item + * with the XFS_BLI_CANCEL bit set to indicate that previous copies + * of the buffer in the log should not be replayed at recovery time. + * This is so that if the blocks covered by the buffer are reused for + * file data before we crash we don't end up replaying old, freed + * meta-data into a user's file. + * + * To handle the cancellation of buffer log items, we make two passes + * over the log during recovery. During the first we build a table of + * those buffers which have been cancelled, and during the second we + * only replay those buffers which do not have corresponding cancel + * records in the table. See xlog_recover_do_buffer_pass[1,2] above + * for more details on the implementation of the table of cancel records. + */ +STATIC int +xlog_recover_do_buffer_trans( + xlog_t *log, + xlog_recover_item_t *item, + int pass) +{ + xfs_buf_log_format_t *buf_f; + xfs_buf_log_format_v1_t *obuf_f; + xfs_mount_t *mp; + xfs_buf_t *bp; + int error; + int cancel; + xfs_daddr_t blkno; + int len; + ushort flags; + + buf_f = (xfs_buf_log_format_t *)item->ri_buf[0].i_addr; + + if (pass == XLOG_RECOVER_PASS1) { + /* + * In this pass we're only looking for buf items + * with the XFS_BLI_CANCEL bit set. + */ + xlog_recover_do_buffer_pass1(log, buf_f); + return 0; + } else { + /* + * In this pass we want to recover all the buffers + * which have not been cancelled and are not + * cancellation buffers themselves. The routine + * we call here will tell us whether or not to + * continue with the replay of this buffer. + */ + cancel = xlog_recover_do_buffer_pass2(log, buf_f); + if (cancel) { + return 0; + } + } + switch (buf_f->blf_type) { + case XFS_LI_BUF: + blkno = buf_f->blf_blkno; + len = buf_f->blf_len; + flags = buf_f->blf_flags; + break; + case XFS_LI_6_1_BUF: + case XFS_LI_5_3_BUF: + obuf_f = (xfs_buf_log_format_v1_t*)buf_f; + blkno = obuf_f->blf_blkno; + len = obuf_f->blf_len; + flags = obuf_f->blf_flags; + break; + default: + xfs_fs_cmn_err(CE_ALERT, log->l_mp, + "xfs_log_recover: unknown buffer type 0x%x, dev %s", + buf_f->blf_type, XFS_BUFTARG_NAME(log->l_targ)); + XFS_ERROR_REPORT("xlog_recover_do_buffer_trans", + XFS_ERRLEVEL_LOW, log->l_mp); + return XFS_ERROR(EFSCORRUPTED); + } + + mp = log->l_mp; + if (flags & XFS_BLI_INODE_BUF) { + bp = xfs_buf_read_flags(mp->m_ddev_targp, blkno, len, + XFS_BUF_LOCK); + } else { + bp = xfs_buf_read(mp->m_ddev_targp, blkno, len, 0); + } + if (XFS_BUF_ISERROR(bp)) { + xfs_ioerror_alert("xlog_recover_do..(read#1)", log->l_mp, + bp, blkno); + error = XFS_BUF_GETERROR(bp); + xfs_buf_relse(bp); + return error; + } + + error = 0; + if (flags & XFS_BLI_INODE_BUF) { + error = xlog_recover_do_inode_buffer(mp, item, bp, buf_f); + } else if (flags & (XFS_BLI_UDQUOT_BUF | XFS_BLI_GDQUOT_BUF)) { + xlog_recover_do_dquot_buffer(mp, log, item, bp, buf_f); + } else { + xlog_recover_do_reg_buffer(mp, item, bp, buf_f); + } + if (error) + return XFS_ERROR(error); + + /* + * Perform delayed write on the buffer. Asynchronous writes will be + * slower when taking into account all the buffers to be flushed. + * + * Also make sure that only inode buffers with good sizes stay in + * the buffer cache. The kernel moves inodes in buffers of 1 block + * or XFS_INODE_CLUSTER_SIZE bytes, whichever is bigger. The inode + * buffers in the log can be a different size if the log was generated + * by an older kernel using unclustered inode buffers or a newer kernel + * running with a different inode cluster size. Regardless, if the + * the inode buffer size isn't MAX(blocksize, XFS_INODE_CLUSTER_SIZE) + * for *our* value of XFS_INODE_CLUSTER_SIZE, then we need to keep + * the buffer out of the buffer cache so that the buffer won't + * overlap with future reads of those inodes. + */ + if (XFS_DINODE_MAGIC == + INT_GET(*((__uint16_t *)(xfs_buf_offset(bp, 0))), ARCH_CONVERT) && + (XFS_BUF_COUNT(bp) != MAX(log->l_mp->m_sb.sb_blocksize, + (__uint32_t)XFS_INODE_CLUSTER_SIZE(log->l_mp)))) { + XFS_BUF_STALE(bp); + error = xfs_bwrite(mp, bp); + } else { + ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL || + XFS_BUF_FSPRIVATE(bp, xfs_mount_t *) == mp); + XFS_BUF_SET_FSPRIVATE(bp, mp); + XFS_BUF_SET_IODONE_FUNC(bp, xlog_recover_iodone); + xfs_bdwrite(mp, bp); + } + + return (error); +} + +STATIC int +xlog_recover_do_inode_trans( + xlog_t *log, + xlog_recover_item_t *item, + int pass) +{ + xfs_inode_log_format_t *in_f; + xfs_mount_t *mp; + xfs_buf_t *bp; + xfs_imap_t imap; + xfs_dinode_t *dip; + xfs_ino_t ino; + int len; + xfs_caddr_t src; + xfs_caddr_t dest; + int error; + int attr_index; + uint fields; + xfs_dinode_core_t *dicp; + + if (pass == XLOG_RECOVER_PASS1) { + return 0; + } + + in_f = (xfs_inode_log_format_t *)item->ri_buf[0].i_addr; + ino = in_f->ilf_ino; + mp = log->l_mp; + if (ITEM_TYPE(item) == XFS_LI_INODE) { + imap.im_blkno = (xfs_daddr_t)in_f->ilf_blkno; + imap.im_len = in_f->ilf_len; + imap.im_boffset = in_f->ilf_boffset; + } else { + /* + * It's an old inode format record. We don't know where + * its cluster is located on disk, and we can't allow + * xfs_imap() to figure it out because the inode btrees + * are not ready to be used. Therefore do not pass the + * XFS_IMAP_LOOKUP flag to xfs_imap(). This will give + * us only the single block in which the inode lives + * rather than its cluster, so we must make sure to + * invalidate the buffer when we write it out below. + */ + imap.im_blkno = 0; + xfs_imap(log->l_mp, NULL, ino, &imap, 0); + } + + /* + * Inode buffers can be freed, look out for it, + * and do not replay the inode. + */ + if (xlog_check_buffer_cancelled(log, imap.im_blkno, imap.im_len, 0)) + return 0; + + bp = xfs_buf_read_flags(mp->m_ddev_targp, imap.im_blkno, imap.im_len, + XFS_BUF_LOCK); + if (XFS_BUF_ISERROR(bp)) { + xfs_ioerror_alert("xlog_recover_do..(read#2)", mp, + bp, imap.im_blkno); + error = XFS_BUF_GETERROR(bp); + xfs_buf_relse(bp); + return error; + } + error = 0; + ASSERT(in_f->ilf_fields & XFS_ILOG_CORE); + dip = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset); + + /* + * Make sure the place we're flushing out to really looks + * like an inode! + */ + if (unlikely(INT_GET(dip->di_core.di_magic, ARCH_CONVERT) != XFS_DINODE_MAGIC)) { + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad inode magic number, dino ptr = 0x%p, dino bp = 0x%p, ino = %Ld", + dip, bp, ino); + XFS_ERROR_REPORT("xlog_recover_do_inode_trans(1)", + XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + dicp = (xfs_dinode_core_t*)(item->ri_buf[1].i_addr); + if (unlikely(dicp->di_magic != XFS_DINODE_MAGIC)) { + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad inode log record, rec ptr 0x%p, ino %Ld", + item, ino); + XFS_ERROR_REPORT("xlog_recover_do_inode_trans(2)", + XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + + /* Skip replay when the on disk inode is newer than the log one */ + if (dicp->di_flushiter < + INT_GET(dip->di_core.di_flushiter, ARCH_CONVERT)) { + /* + * Deal with the wrap case, DI_MAX_FLUSH is less + * than smaller numbers + */ + if ((INT_GET(dip->di_core.di_flushiter, ARCH_CONVERT) + == DI_MAX_FLUSH) && + (dicp->di_flushiter < (DI_MAX_FLUSH>>1))) { + /* do nothing */ + } else { + xfs_buf_relse(bp); + return 0; + } + } + /* Take the opportunity to reset the flush iteration count */ + dicp->di_flushiter = 0; + + if (unlikely((dicp->di_mode & S_IFMT) == S_IFREG)) { + if ((dicp->di_format != XFS_DINODE_FMT_EXTENTS) && + (dicp->di_format != XFS_DINODE_FMT_BTREE)) { + XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(3)", + XFS_ERRLEVEL_LOW, mp, dicp); + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad regular inode log record, rec ptr 0x%p, ino ptr = 0x%p, ino bp = 0x%p, ino %Ld", + item, dip, bp, ino); + return XFS_ERROR(EFSCORRUPTED); + } + } else if (unlikely((dicp->di_mode & S_IFMT) == S_IFDIR)) { + if ((dicp->di_format != XFS_DINODE_FMT_EXTENTS) && + (dicp->di_format != XFS_DINODE_FMT_BTREE) && + (dicp->di_format != XFS_DINODE_FMT_LOCAL)) { + XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(4)", + XFS_ERRLEVEL_LOW, mp, dicp); + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad dir inode log record, rec ptr 0x%p, ino ptr = 0x%p, ino bp = 0x%p, ino %Ld", + item, dip, bp, ino); + return XFS_ERROR(EFSCORRUPTED); + } + } + if (unlikely(dicp->di_nextents + dicp->di_anextents > dicp->di_nblocks)){ + XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(5)", + XFS_ERRLEVEL_LOW, mp, dicp); + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad inode log record, rec ptr 0x%p, dino ptr 0x%p, dino bp 0x%p, ino %Ld, total extents = %d, nblocks = %Ld", + item, dip, bp, ino, + dicp->di_nextents + dicp->di_anextents, + dicp->di_nblocks); + return XFS_ERROR(EFSCORRUPTED); + } + if (unlikely(dicp->di_forkoff > mp->m_sb.sb_inodesize)) { + XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(6)", + XFS_ERRLEVEL_LOW, mp, dicp); + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad inode log rec ptr 0x%p, dino ptr 0x%p, dino bp 0x%p, ino %Ld, forkoff 0x%x", + item, dip, bp, ino, dicp->di_forkoff); + return XFS_ERROR(EFSCORRUPTED); + } + if (unlikely(item->ri_buf[1].i_len > sizeof(xfs_dinode_core_t))) { + XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(7)", + XFS_ERRLEVEL_LOW, mp, dicp); + xfs_buf_relse(bp); + xfs_fs_cmn_err(CE_ALERT, mp, + "xfs_inode_recover: Bad inode log record length %d, rec ptr 0x%p", + item->ri_buf[1].i_len, item); + return XFS_ERROR(EFSCORRUPTED); + } + + /* The core is in in-core format */ + xfs_xlate_dinode_core((xfs_caddr_t)&dip->di_core, + (xfs_dinode_core_t*)item->ri_buf[1].i_addr, -1); + + /* the rest is in on-disk format */ + if (item->ri_buf[1].i_len > sizeof(xfs_dinode_core_t)) { + memcpy((xfs_caddr_t) dip + sizeof(xfs_dinode_core_t), + item->ri_buf[1].i_addr + sizeof(xfs_dinode_core_t), + item->ri_buf[1].i_len - sizeof(xfs_dinode_core_t)); + } + + fields = in_f->ilf_fields; + switch (fields & (XFS_ILOG_DEV | XFS_ILOG_UUID)) { + case XFS_ILOG_DEV: + INT_SET(dip->di_u.di_dev, ARCH_CONVERT, in_f->ilf_u.ilfu_rdev); + + break; + case XFS_ILOG_UUID: + dip->di_u.di_muuid = in_f->ilf_u.ilfu_uuid; + break; + } + + if (in_f->ilf_size == 2) + goto write_inode_buffer; + len = item->ri_buf[2].i_len; + src = item->ri_buf[2].i_addr; + ASSERT(in_f->ilf_size <= 4); + ASSERT((in_f->ilf_size == 3) || (fields & XFS_ILOG_AFORK)); + ASSERT(!(fields & XFS_ILOG_DFORK) || + (len == in_f->ilf_dsize)); + + switch (fields & XFS_ILOG_DFORK) { + case XFS_ILOG_DDATA: + case XFS_ILOG_DEXT: + memcpy(&dip->di_u, src, len); + break; + + case XFS_ILOG_DBROOT: + xfs_bmbt_to_bmdr((xfs_bmbt_block_t *)src, len, + &(dip->di_u.di_bmbt), + XFS_DFORK_DSIZE(dip, mp)); + break; + + default: + /* + * There are no data fork flags set. + */ + ASSERT((fields & XFS_ILOG_DFORK) == 0); + break; + } + + /* + * If we logged any attribute data, recover it. There may or + * may not have been any other non-core data logged in this + * transaction. + */ + if (in_f->ilf_fields & XFS_ILOG_AFORK) { + if (in_f->ilf_fields & XFS_ILOG_DFORK) { + attr_index = 3; + } else { + attr_index = 2; + } + len = item->ri_buf[attr_index].i_len; + src = item->ri_buf[attr_index].i_addr; + ASSERT(len == in_f->ilf_asize); + + switch (in_f->ilf_fields & XFS_ILOG_AFORK) { + case XFS_ILOG_ADATA: + case XFS_ILOG_AEXT: + dest = XFS_DFORK_APTR(dip); + ASSERT(len <= XFS_DFORK_ASIZE(dip, mp)); + memcpy(dest, src, len); + break; + + case XFS_ILOG_ABROOT: + dest = XFS_DFORK_APTR(dip); + xfs_bmbt_to_bmdr((xfs_bmbt_block_t *)src, len, + (xfs_bmdr_block_t*)dest, + XFS_DFORK_ASIZE(dip, mp)); + break; + + default: + xlog_warn("XFS: xlog_recover_do_inode_trans: Invalid flag"); + ASSERT(0); + xfs_buf_relse(bp); + return XFS_ERROR(EIO); + } + } + +write_inode_buffer: + if (ITEM_TYPE(item) == XFS_LI_INODE) { + ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL || + XFS_BUF_FSPRIVATE(bp, xfs_mount_t *) == mp); + XFS_BUF_SET_FSPRIVATE(bp, mp); + XFS_BUF_SET_IODONE_FUNC(bp, xlog_recover_iodone); + xfs_bdwrite(mp, bp); + } else { + XFS_BUF_STALE(bp); + error = xfs_bwrite(mp, bp); + } + + return (error); +} + +/* + * Recover QUOTAOFF records. We simply make a note of it in the xlog_t + * structure, so that we know not to do any dquot item or dquot buffer recovery, + * of that type. + */ +STATIC int +xlog_recover_do_quotaoff_trans( + xlog_t *log, + xlog_recover_item_t *item, + int pass) +{ + xfs_qoff_logformat_t *qoff_f; + + if (pass == XLOG_RECOVER_PASS2) { + return (0); + } + + qoff_f = (xfs_qoff_logformat_t *)item->ri_buf[0].i_addr; + ASSERT(qoff_f); + + /* + * The logitem format's flag tells us if this was user quotaoff, + * group quotaoff or both. + */ + if (qoff_f->qf_flags & XFS_UQUOTA_ACCT) + log->l_quotaoffs_flag |= XFS_DQ_USER; + if (qoff_f->qf_flags & XFS_GQUOTA_ACCT) + log->l_quotaoffs_flag |= XFS_DQ_GROUP; + + return (0); +} + +/* + * Recover a dquot record + */ +STATIC int +xlog_recover_do_dquot_trans( + xlog_t *log, + xlog_recover_item_t *item, + int pass) +{ + xfs_mount_t *mp; + xfs_buf_t *bp; + struct xfs_disk_dquot *ddq, *recddq; + int error; + xfs_dq_logformat_t *dq_f; + uint type; + + if (pass == XLOG_RECOVER_PASS1) { + return 0; + } + mp = log->l_mp; + + /* + * Filesystems are required to send in quota flags at mount time. + */ + if (mp->m_qflags == 0) + return (0); + + recddq = (xfs_disk_dquot_t *)item->ri_buf[1].i_addr; + ASSERT(recddq); + /* + * This type of quotas was turned off, so ignore this record. + */ + type = INT_GET(recddq->d_flags, ARCH_CONVERT) & + (XFS_DQ_USER | XFS_DQ_GROUP); + ASSERT(type); + if (log->l_quotaoffs_flag & type) + return (0); + + /* + * At this point we know that quota was _not_ turned off. + * Since the mount flags are not indicating to us otherwise, this + * must mean that quota is on, and the dquot needs to be replayed. + * Remember that we may not have fully recovered the superblock yet, + * so we can't do the usual trick of looking at the SB quota bits. + * + * The other possibility, of course, is that the quota subsystem was + * removed since the last mount - ENOSYS. + */ + dq_f = (xfs_dq_logformat_t *)item->ri_buf[0].i_addr; + ASSERT(dq_f); + if ((error = xfs_qm_dqcheck(recddq, + dq_f->qlf_id, + 0, XFS_QMOPT_DOWARN, + "xlog_recover_do_dquot_trans (log copy)"))) { + return XFS_ERROR(EIO); + } + ASSERT(dq_f->qlf_len == 1); + + error = xfs_read_buf(mp, mp->m_ddev_targp, + dq_f->qlf_blkno, + XFS_FSB_TO_BB(mp, dq_f->qlf_len), + 0, &bp); + if (error) { + xfs_ioerror_alert("xlog_recover_do..(read#3)", mp, + bp, dq_f->qlf_blkno); + return error; + } + ASSERT(bp); + ddq = (xfs_disk_dquot_t *)xfs_buf_offset(bp, dq_f->qlf_boffset); + + /* + * At least the magic num portion should be on disk because this + * was among a chunk of dquots created earlier, and we did some + * minimal initialization then. + */ + if (xfs_qm_dqcheck(ddq, dq_f->qlf_id, 0, XFS_QMOPT_DOWARN, + "xlog_recover_do_dquot_trans")) { + xfs_buf_relse(bp); + return XFS_ERROR(EIO); + } + + memcpy(ddq, recddq, item->ri_buf[1].i_len); + + ASSERT(dq_f->qlf_size == 2); + ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL || + XFS_BUF_FSPRIVATE(bp, xfs_mount_t *) == mp); + XFS_BUF_SET_FSPRIVATE(bp, mp); + XFS_BUF_SET_IODONE_FUNC(bp, xlog_recover_iodone); + xfs_bdwrite(mp, bp); + + return (0); +} + +/* + * This routine is called to create an in-core extent free intent + * item from the efi format structure which was logged on disk. + * It allocates an in-core efi, copies the extents from the format + * structure into it, and adds the efi to the AIL with the given + * LSN. + */ +STATIC void +xlog_recover_do_efi_trans( + xlog_t *log, + xlog_recover_item_t *item, + xfs_lsn_t lsn, + int pass) +{ + xfs_mount_t *mp; + xfs_efi_log_item_t *efip; + xfs_efi_log_format_t *efi_formatp; + SPLDECL(s); + + if (pass == XLOG_RECOVER_PASS1) { + return; + } + + efi_formatp = (xfs_efi_log_format_t *)item->ri_buf[0].i_addr; + ASSERT(item->ri_buf[0].i_len == + (sizeof(xfs_efi_log_format_t) + + ((efi_formatp->efi_nextents - 1) * sizeof(xfs_extent_t)))); + + mp = log->l_mp; + efip = xfs_efi_init(mp, efi_formatp->efi_nextents); + memcpy((char *)&(efip->efi_format), (char *)efi_formatp, + sizeof(xfs_efi_log_format_t) + + ((efi_formatp->efi_nextents - 1) * sizeof(xfs_extent_t))); + efip->efi_next_extent = efi_formatp->efi_nextents; + efip->efi_flags |= XFS_EFI_COMMITTED; + + AIL_LOCK(mp,s); + /* + * xfs_trans_update_ail() drops the AIL lock. + */ + xfs_trans_update_ail(mp, (xfs_log_item_t *)efip, lsn, s); +} + + +/* + * This routine is called when an efd format structure is found in + * a committed transaction in the log. It's purpose is to cancel + * the corresponding efi if it was still in the log. To do this + * it searches the AIL for the efi with an id equal to that in the + * efd format structure. If we find it, we remove the efi from the + * AIL and free it. + */ +STATIC void +xlog_recover_do_efd_trans( + xlog_t *log, + xlog_recover_item_t *item, + int pass) +{ + xfs_mount_t *mp; + xfs_efd_log_format_t *efd_formatp; + xfs_efi_log_item_t *efip = NULL; + xfs_log_item_t *lip; + int gen; + int nexts; + __uint64_t efi_id; + SPLDECL(s); + + if (pass == XLOG_RECOVER_PASS1) { + return; + } + + efd_formatp = (xfs_efd_log_format_t *)item->ri_buf[0].i_addr; + ASSERT(item->ri_buf[0].i_len == + (sizeof(xfs_efd_log_format_t) + + ((efd_formatp->efd_nextents - 1) * sizeof(xfs_extent_t)))); + efi_id = efd_formatp->efd_efi_id; + + /* + * Search for the efi with the id in the efd format structure + * in the AIL. + */ + mp = log->l_mp; + AIL_LOCK(mp,s); + lip = xfs_trans_first_ail(mp, &gen); + while (lip != NULL) { + if (lip->li_type == XFS_LI_EFI) { + efip = (xfs_efi_log_item_t *)lip; + if (efip->efi_format.efi_id == efi_id) { + /* + * xfs_trans_delete_ail() drops the + * AIL lock. + */ + xfs_trans_delete_ail(mp, lip, s); + break; + } + } + lip = xfs_trans_next_ail(mp, lip, &gen, NULL); + } + if (lip == NULL) { + AIL_UNLOCK(mp, s); + } + + /* + * If we found it, then free it up. If it wasn't there, it + * must have been overwritten in the log. Oh well. + */ + if (lip != NULL) { + nexts = efip->efi_format.efi_nextents; + if (nexts > XFS_EFI_MAX_FAST_EXTENTS) { + kmem_free(lip, sizeof(xfs_efi_log_item_t) + + ((nexts - 1) * sizeof(xfs_extent_t))); + } else { + kmem_zone_free(xfs_efi_zone, efip); + } + } +} + +/* + * Perform the transaction + * + * If the transaction modifies a buffer or inode, do it now. Otherwise, + * EFIs and EFDs get queued up by adding entries into the AIL for them. + */ +STATIC int +xlog_recover_do_trans( + xlog_t *log, + xlog_recover_t *trans, + int pass) +{ + int error = 0; + xlog_recover_item_t *item, *first_item; + + if ((error = xlog_recover_reorder_trans(log, trans))) + return error; + first_item = item = trans->r_itemq; + do { + /* + * we don't need to worry about the block number being + * truncated in > 1 TB buffers because in user-land, + * we're now n32 or 64-bit so xfs_daddr_t is 64-bits so + * the blkno's will get through the user-mode buffer + * cache properly. The only bad case is o32 kernels + * where xfs_daddr_t is 32-bits but mount will warn us + * off a > 1 TB filesystem before we get here. + */ + if ((ITEM_TYPE(item) == XFS_LI_BUF) || + (ITEM_TYPE(item) == XFS_LI_6_1_BUF) || + (ITEM_TYPE(item) == XFS_LI_5_3_BUF)) { + if ((error = xlog_recover_do_buffer_trans(log, item, + pass))) + break; + } else if ((ITEM_TYPE(item) == XFS_LI_INODE) || + (ITEM_TYPE(item) == XFS_LI_6_1_INODE) || + (ITEM_TYPE(item) == XFS_LI_5_3_INODE)) { + if ((error = xlog_recover_do_inode_trans(log, item, + pass))) + break; + } else if (ITEM_TYPE(item) == XFS_LI_EFI) { + xlog_recover_do_efi_trans(log, item, trans->r_lsn, + pass); + } else if (ITEM_TYPE(item) == XFS_LI_EFD) { + xlog_recover_do_efd_trans(log, item, pass); + } else if (ITEM_TYPE(item) == XFS_LI_DQUOT) { + if ((error = xlog_recover_do_dquot_trans(log, item, + pass))) + break; + } else if ((ITEM_TYPE(item) == XFS_LI_QUOTAOFF)) { + if ((error = xlog_recover_do_quotaoff_trans(log, item, + pass))) + break; + } else { + xlog_warn("XFS: xlog_recover_do_trans"); + ASSERT(0); + error = XFS_ERROR(EIO); + break; + } + item = item->ri_next; + } while (first_item != item); + + return error; +} + +/* + * Free up any resources allocated by the transaction + * + * Remember that EFIs, EFDs, and IUNLINKs are handled later. + */ +STATIC void +xlog_recover_free_trans( + xlog_recover_t *trans) +{ + xlog_recover_item_t *first_item, *item, *free_item; + int i; + + item = first_item = trans->r_itemq; + do { + free_item = item; + item = item->ri_next; + /* Free the regions in the item. */ + for (i = 0; i < free_item->ri_cnt; i++) { + kmem_free(free_item->ri_buf[i].i_addr, + free_item->ri_buf[i].i_len); + } + /* Free the item itself */ + kmem_free(free_item->ri_buf, + (free_item->ri_total * sizeof(xfs_log_iovec_t))); + kmem_free(free_item, sizeof(xlog_recover_item_t)); + } while (first_item != item); + /* Free the transaction recover structure */ + kmem_free(trans, sizeof(xlog_recover_t)); +} + +STATIC int +xlog_recover_commit_trans( + xlog_t *log, + xlog_recover_t **q, + xlog_recover_t *trans, + int pass) +{ + int error; + + if ((error = xlog_recover_unlink_tid(q, trans))) + return error; + if ((error = xlog_recover_do_trans(log, trans, pass))) + return error; + xlog_recover_free_trans(trans); /* no error */ + return 0; +} + +STATIC int +xlog_recover_unmount_trans( + xlog_recover_t *trans) +{ + /* Do nothing now */ + xlog_warn("XFS: xlog_recover_unmount_trans: Unmount LR"); + return 0; +} + +/* + * There are two valid states of the r_state field. 0 indicates that the + * transaction structure is in a normal state. We have either seen the + * start of the transaction or the last operation we added was not a partial + * operation. If the last operation we added to the transaction was a + * partial operation, we need to mark r_state with XLOG_WAS_CONT_TRANS. + * + * NOTE: skip LRs with 0 data length. + */ +STATIC int +xlog_recover_process_data( + xlog_t *log, + xlog_recover_t *rhash[], + xlog_rec_header_t *rhead, + xfs_caddr_t dp, + int pass) +{ + xfs_caddr_t lp; + int num_logops; + xlog_op_header_t *ohead; + xlog_recover_t *trans; + xlog_tid_t tid; + int error; + unsigned long hash; + uint flags; + + lp = dp + INT_GET(rhead->h_len, ARCH_CONVERT); + num_logops = INT_GET(rhead->h_num_logops, ARCH_CONVERT); + + /* check the log format matches our own - else we can't recover */ + if (xlog_header_check_recover(log->l_mp, rhead)) + return (XFS_ERROR(EIO)); + + while ((dp < lp) && num_logops) { + ASSERT(dp + sizeof(xlog_op_header_t) <= lp); + ohead = (xlog_op_header_t *)dp; + dp += sizeof(xlog_op_header_t); + if (ohead->oh_clientid != XFS_TRANSACTION && + ohead->oh_clientid != XFS_LOG) { + xlog_warn( + "XFS: xlog_recover_process_data: bad clientid"); + ASSERT(0); + return (XFS_ERROR(EIO)); + } + tid = INT_GET(ohead->oh_tid, ARCH_CONVERT); + hash = XLOG_RHASH(tid); + trans = xlog_recover_find_tid(rhash[hash], tid); + if (trans == NULL) { /* not found; add new tid */ + if (ohead->oh_flags & XLOG_START_TRANS) + xlog_recover_new_tid(&rhash[hash], tid, + INT_GET(rhead->h_lsn, ARCH_CONVERT)); + } else { + ASSERT(dp+INT_GET(ohead->oh_len, ARCH_CONVERT) <= lp); + flags = ohead->oh_flags & ~XLOG_END_TRANS; + if (flags & XLOG_WAS_CONT_TRANS) + flags &= ~XLOG_CONTINUE_TRANS; + switch (flags) { + case XLOG_COMMIT_TRANS: + error = xlog_recover_commit_trans(log, + &rhash[hash], trans, pass); + break; + case XLOG_UNMOUNT_TRANS: + error = xlog_recover_unmount_trans(trans); + break; + case XLOG_WAS_CONT_TRANS: + error = xlog_recover_add_to_cont_trans(trans, + dp, INT_GET(ohead->oh_len, + ARCH_CONVERT)); + break; + case XLOG_START_TRANS: + xlog_warn( + "XFS: xlog_recover_process_data: bad transaction"); + ASSERT(0); + error = XFS_ERROR(EIO); + break; + case 0: + case XLOG_CONTINUE_TRANS: + error = xlog_recover_add_to_trans(trans, + dp, INT_GET(ohead->oh_len, + ARCH_CONVERT)); + break; + default: + xlog_warn( + "XFS: xlog_recover_process_data: bad flag"); + ASSERT(0); + error = XFS_ERROR(EIO); + break; + } + if (error) + return error; + } + dp += INT_GET(ohead->oh_len, ARCH_CONVERT); + num_logops--; + } + return 0; +} + +/* + * Process an extent free intent item that was recovered from + * the log. We need to free the extents that it describes. + */ +STATIC void +xlog_recover_process_efi( + xfs_mount_t *mp, + xfs_efi_log_item_t *efip) +{ + xfs_efd_log_item_t *efdp; + xfs_trans_t *tp; + int i; + xfs_extent_t *extp; + xfs_fsblock_t startblock_fsb; + + ASSERT(!(efip->efi_flags & XFS_EFI_RECOVERED)); + + /* + * First check the validity of the extents described by the + * EFI. If any are bad, then assume that all are bad and + * just toss the EFI. + */ + for (i = 0; i < efip->efi_format.efi_nextents; i++) { + extp = &(efip->efi_format.efi_extents[i]); + startblock_fsb = XFS_BB_TO_FSB(mp, + XFS_FSB_TO_DADDR(mp, extp->ext_start)); + if ((startblock_fsb == 0) || + (extp->ext_len == 0) || + (startblock_fsb >= mp->m_sb.sb_dblocks) || + (extp->ext_len >= mp->m_sb.sb_agblocks)) { + /* + * This will pull the EFI from the AIL and + * free the memory associated with it. + */ + xfs_efi_release(efip, efip->efi_format.efi_nextents); + return; + } + } + + tp = xfs_trans_alloc(mp, 0); + xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, 0, 0); + efdp = xfs_trans_get_efd(tp, efip, efip->efi_format.efi_nextents); + + for (i = 0; i < efip->efi_format.efi_nextents; i++) { + extp = &(efip->efi_format.efi_extents[i]); + xfs_free_extent(tp, extp->ext_start, extp->ext_len); + xfs_trans_log_efd_extent(tp, efdp, extp->ext_start, + extp->ext_len); + } + + efip->efi_flags |= XFS_EFI_RECOVERED; + xfs_trans_commit(tp, 0, NULL); +} + +/* + * Verify that once we've encountered something other than an EFI + * in the AIL that there are no more EFIs in the AIL. + */ +#if defined(DEBUG) +STATIC void +xlog_recover_check_ail( + xfs_mount_t *mp, + xfs_log_item_t *lip, + int gen) +{ + int orig_gen = gen; + + do { + ASSERT(lip->li_type != XFS_LI_EFI); + lip = xfs_trans_next_ail(mp, lip, &gen, NULL); + /* + * The check will be bogus if we restart from the + * beginning of the AIL, so ASSERT that we don't. + * We never should since we're holding the AIL lock + * the entire time. + */ + ASSERT(gen == orig_gen); + } while (lip != NULL); +} +#endif /* DEBUG */ + +/* + * When this is called, all of the EFIs which did not have + * corresponding EFDs should be in the AIL. What we do now + * is free the extents associated with each one. + * + * Since we process the EFIs in normal transactions, they + * will be removed at some point after the commit. This prevents + * us from just walking down the list processing each one. + * We'll use a flag in the EFI to skip those that we've already + * processed and use the AIL iteration mechanism's generation + * count to try to speed this up at least a bit. + * + * When we start, we know that the EFIs are the only things in + * the AIL. As we process them, however, other items are added + * to the AIL. Since everything added to the AIL must come after + * everything already in the AIL, we stop processing as soon as + * we see something other than an EFI in the AIL. + */ +STATIC void +xlog_recover_process_efis( + xlog_t *log) +{ + xfs_log_item_t *lip; + xfs_efi_log_item_t *efip; + int gen; + xfs_mount_t *mp; + SPLDECL(s); + + mp = log->l_mp; + AIL_LOCK(mp,s); + + lip = xfs_trans_first_ail(mp, &gen); + while (lip != NULL) { + /* + * We're done when we see something other than an EFI. + */ + if (lip->li_type != XFS_LI_EFI) { + xlog_recover_check_ail(mp, lip, gen); + break; + } + + /* + * Skip EFIs that we've already processed. + */ + efip = (xfs_efi_log_item_t *)lip; + if (efip->efi_flags & XFS_EFI_RECOVERED) { + lip = xfs_trans_next_ail(mp, lip, &gen, NULL); + continue; + } + + AIL_UNLOCK(mp, s); + xlog_recover_process_efi(mp, efip); + AIL_LOCK(mp,s); + lip = xfs_trans_next_ail(mp, lip, &gen, NULL); + } + AIL_UNLOCK(mp, s); +} + +/* + * This routine performs a transaction to null out a bad inode pointer + * in an agi unlinked inode hash bucket. + */ +STATIC void +xlog_recover_clear_agi_bucket( + xfs_mount_t *mp, + xfs_agnumber_t agno, + int bucket) +{ + xfs_trans_t *tp; + xfs_agi_t *agi; + xfs_buf_t *agibp; + int offset; + int error; + + tp = xfs_trans_alloc(mp, XFS_TRANS_CLEAR_AGI_BUCKET); + xfs_trans_reserve(tp, 0, XFS_CLEAR_AGI_BUCKET_LOG_RES(mp), 0, 0, 0); + + error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, + XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), + XFS_FSS_TO_BB(mp, 1), 0, &agibp); + if (error) { + xfs_trans_cancel(tp, XFS_TRANS_ABORT); + return; + } + + agi = XFS_BUF_TO_AGI(agibp); + if (INT_GET(agi->agi_magicnum, ARCH_CONVERT) != XFS_AGI_MAGIC) { + xfs_trans_cancel(tp, XFS_TRANS_ABORT); + return; + } + ASSERT(INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC); + + INT_SET(agi->agi_unlinked[bucket], ARCH_CONVERT, NULLAGINO); + offset = offsetof(xfs_agi_t, agi_unlinked) + + (sizeof(xfs_agino_t) * bucket); + xfs_trans_log_buf(tp, agibp, offset, + (offset + sizeof(xfs_agino_t) - 1)); + + (void) xfs_trans_commit(tp, 0, NULL); +} + +/* + * xlog_iunlink_recover + * + * This is called during recovery to process any inodes which + * we unlinked but not freed when the system crashed. These + * inodes will be on the lists in the AGI blocks. What we do + * here is scan all the AGIs and fully truncate and free any + * inodes found on the lists. Each inode is removed from the + * lists when it has been fully truncated and is freed. The + * freeing of the inode and its removal from the list must be + * atomic. + */ +void +xlog_recover_process_iunlinks( + xlog_t *log) +{ + xfs_mount_t *mp; + xfs_agnumber_t agno; + xfs_agi_t *agi; + xfs_buf_t *agibp; + xfs_buf_t *ibp; + xfs_dinode_t *dip; + xfs_inode_t *ip; + xfs_agino_t agino; + xfs_ino_t ino; + int bucket; + int error; + uint mp_dmevmask; + + mp = log->l_mp; + + /* + * Prevent any DMAPI event from being sent while in this function. + */ + mp_dmevmask = mp->m_dmevmask; + mp->m_dmevmask = 0; + + for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { + /* + * Find the agi for this ag. + */ + agibp = xfs_buf_read(mp->m_ddev_targp, + XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), + XFS_FSS_TO_BB(mp, 1), 0); + if (XFS_BUF_ISERROR(agibp)) { + xfs_ioerror_alert("xlog_recover_process_iunlinks(#1)", + log->l_mp, agibp, + XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp))); + } + agi = XFS_BUF_TO_AGI(agibp); + ASSERT(XFS_AGI_MAGIC == + INT_GET(agi->agi_magicnum, ARCH_CONVERT)); + + for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) { + + agino = INT_GET(agi->agi_unlinked[bucket], ARCH_CONVERT); + while (agino != NULLAGINO) { + + /* + * Release the agi buffer so that it can + * be acquired in the normal course of the + * transaction to truncate and free the inode. + */ + xfs_buf_relse(agibp); + + ino = XFS_AGINO_TO_INO(mp, agno, agino); + error = xfs_iget(mp, NULL, ino, 0, 0, &ip, 0); + ASSERT(error || (ip != NULL)); + + if (!error) { + /* + * Get the on disk inode to find the + * next inode in the bucket. + */ + error = xfs_itobp(mp, NULL, ip, &dip, + &ibp, 0); + ASSERT(error || (dip != NULL)); + } + + if (!error) { + ASSERT(ip->i_d.di_nlink == 0); + + /* setup for the next pass */ + agino = INT_GET(dip->di_next_unlinked, + ARCH_CONVERT); + xfs_buf_relse(ibp); + /* + * Prevent any DMAPI event from + * being sent when the + * reference on the inode is + * dropped. + */ + ip->i_d.di_dmevmask = 0; + + /* + * If this is a new inode, handle + * it specially. Otherwise, + * just drop our reference to the + * inode. If there are no + * other references, this will + * send the inode to + * xfs_inactive() which will + * truncate the file and free + * the inode. + */ + if (ip->i_d.di_mode == 0) + xfs_iput_new(ip, 0); + else + VN_RELE(XFS_ITOV(ip)); + } else { + /* + * We can't read in the inode + * this bucket points to, or + * this inode is messed up. Just + * ditch this bucket of inodes. We + * will lose some inodes and space, + * but at least we won't hang. Call + * xlog_recover_clear_agi_bucket() + * to perform a transaction to clear + * the inode pointer in the bucket. + */ + xlog_recover_clear_agi_bucket(mp, agno, + bucket); + + agino = NULLAGINO; + } + + /* + * Reacquire the agibuffer and continue around + * the loop. + */ + agibp = xfs_buf_read(mp->m_ddev_targp, + XFS_AG_DADDR(mp, agno, + XFS_AGI_DADDR(mp)), + XFS_FSS_TO_BB(mp, 1), 0); + if (XFS_BUF_ISERROR(agibp)) { + xfs_ioerror_alert( + "xlog_recover_process_iunlinks(#2)", + log->l_mp, agibp, + XFS_AG_DADDR(mp, agno, + XFS_AGI_DADDR(mp))); + } + agi = XFS_BUF_TO_AGI(agibp); + ASSERT(XFS_AGI_MAGIC == INT_GET( + agi->agi_magicnum, ARCH_CONVERT)); + } + } + + /* + * Release the buffer for the current agi so we can + * go on to the next one. + */ + xfs_buf_relse(agibp); + } + + mp->m_dmevmask = mp_dmevmask; +} + + +#ifdef DEBUG +STATIC void +xlog_pack_data_checksum( + xlog_t *log, + xlog_in_core_t *iclog, + int size) +{ + int i; + uint *up; + uint chksum = 0; + + up = (uint *)iclog->ic_datap; + /* divide length by 4 to get # words */ + for (i = 0; i < (size >> 2); i++) { + chksum ^= INT_GET(*up, ARCH_CONVERT); + up++; + } + INT_SET(iclog->ic_header.h_chksum, ARCH_CONVERT, chksum); +} +#else +#define xlog_pack_data_checksum(log, iclog, size) +#endif + +/* + * Stamp cycle number in every block + */ +void +xlog_pack_data( + xlog_t *log, + xlog_in_core_t *iclog, + int roundoff) +{ + int i, j, k; + int size = iclog->ic_offset + roundoff; + uint cycle_lsn; + xfs_caddr_t dp; + xlog_in_core_2_t *xhdr; + + xlog_pack_data_checksum(log, iclog, size); + + cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn); + + dp = iclog->ic_datap; + for (i = 0; i < BTOBB(size) && + i < (XLOG_HEADER_CYCLE_SIZE / BBSIZE); i++) { + iclog->ic_header.h_cycle_data[i] = *(uint *)dp; + *(uint *)dp = cycle_lsn; + dp += BBSIZE; + } + + if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) { + xhdr = (xlog_in_core_2_t *)&iclog->ic_header; + for ( ; i < BTOBB(size); i++) { + j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); + k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); + xhdr[j].hic_xheader.xh_cycle_data[k] = *(uint *)dp; + *(uint *)dp = cycle_lsn; + dp += BBSIZE; + } + + for (i = 1; i < log->l_iclog_heads; i++) { + xhdr[i].hic_xheader.xh_cycle = cycle_lsn; + } + } +} + +#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY) +STATIC void +xlog_unpack_data_checksum( + xlog_rec_header_t *rhead, + xfs_caddr_t dp, + xlog_t *log) +{ + uint *up = (uint *)dp; + uint chksum = 0; + int i; + + /* divide length by 4 to get # words */ + for (i=0; i < INT_GET(rhead->h_len, ARCH_CONVERT) >> 2; i++) { + chksum ^= INT_GET(*up, ARCH_CONVERT); + up++; + } + if (chksum != INT_GET(rhead->h_chksum, ARCH_CONVERT)) { + if (rhead->h_chksum || + ((log->l_flags & XLOG_CHKSUM_MISMATCH) == 0)) { + cmn_err(CE_DEBUG, + "XFS: LogR chksum mismatch: was (0x%x) is (0x%x)", + INT_GET(rhead->h_chksum, ARCH_CONVERT), chksum); + cmn_err(CE_DEBUG, +"XFS: Disregard message if filesystem was created with non-DEBUG kernel"); + if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) { + cmn_err(CE_DEBUG, + "XFS: LogR this is a LogV2 filesystem"); + } + log->l_flags |= XLOG_CHKSUM_MISMATCH; + } + } +} +#else +#define xlog_unpack_data_checksum(rhead, dp, log) +#endif + +STATIC void +xlog_unpack_data( + xlog_rec_header_t *rhead, + xfs_caddr_t dp, + xlog_t *log) +{ + int i, j, k; + xlog_in_core_2_t *xhdr; + + for (i = 0; i < BTOBB(INT_GET(rhead->h_len, ARCH_CONVERT)) && + i < (XLOG_HEADER_CYCLE_SIZE / BBSIZE); i++) { + *(uint *)dp = *(uint *)&rhead->h_cycle_data[i]; + dp += BBSIZE; + } + + if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) { + xhdr = (xlog_in_core_2_t *)rhead; + for ( ; i < BTOBB(INT_GET(rhead->h_len, ARCH_CONVERT)); i++) { + j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); + k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); + *(uint *)dp = xhdr[j].hic_xheader.xh_cycle_data[k]; + dp += BBSIZE; + } + } + + xlog_unpack_data_checksum(rhead, dp, log); +} + +STATIC int +xlog_valid_rec_header( + xlog_t *log, + xlog_rec_header_t *rhead, + xfs_daddr_t blkno) +{ + int hlen; + + if (unlikely( + (INT_GET(rhead->h_magicno, ARCH_CONVERT) != + XLOG_HEADER_MAGIC_NUM))) { + XFS_ERROR_REPORT("xlog_valid_rec_header(1)", + XFS_ERRLEVEL_LOW, log->l_mp); + return XFS_ERROR(EFSCORRUPTED); + } + if (unlikely( + (!rhead->h_version || + (INT_GET(rhead->h_version, ARCH_CONVERT) & + (~XLOG_VERSION_OKBITS)) != 0))) { + xlog_warn("XFS: %s: unrecognised log version (%d).", + __FUNCTION__, INT_GET(rhead->h_version, ARCH_CONVERT)); + return XFS_ERROR(EIO); + } + + /* LR body must have data or it wouldn't have been written */ + hlen = INT_GET(rhead->h_len, ARCH_CONVERT); + if (unlikely( hlen <= 0 || hlen > INT_MAX )) { + XFS_ERROR_REPORT("xlog_valid_rec_header(2)", + XFS_ERRLEVEL_LOW, log->l_mp); + return XFS_ERROR(EFSCORRUPTED); + } + if (unlikely( blkno > log->l_logBBsize || blkno > INT_MAX )) { + XFS_ERROR_REPORT("xlog_valid_rec_header(3)", + XFS_ERRLEVEL_LOW, log->l_mp); + return XFS_ERROR(EFSCORRUPTED); + } + return 0; +} + +/* + * Read the log from tail to head and process the log records found. + * Handle the two cases where the tail and head are in the same cycle + * and where the active portion of the log wraps around the end of + * the physical log separately. The pass parameter is passed through + * to the routines called to process the data and is not looked at + * here. + */ +STATIC int +xlog_do_recovery_pass( + xlog_t *log, + xfs_daddr_t head_blk, + xfs_daddr_t tail_blk, + int pass) +{ + xlog_rec_header_t *rhead; + xfs_daddr_t blk_no; + xfs_caddr_t bufaddr, offset; + xfs_buf_t *hbp, *dbp; + int error = 0, h_size; + int bblks, split_bblks; + int hblks, split_hblks, wrapped_hblks; + xlog_recover_t *rhash[XLOG_RHASH_SIZE]; + + ASSERT(head_blk != tail_blk); + + /* + * Read the header of the tail block and get the iclog buffer size from + * h_size. Use this to tell how many sectors make up the log header. + */ + if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) { + /* + * When using variable length iclogs, read first sector of + * iclog header and extract the header size from it. Get a + * new hbp that is the correct size. + */ + hbp = xlog_get_bp(log, 1); + if (!hbp) + return ENOMEM; + if ((error = xlog_bread(log, tail_blk, 1, hbp))) + goto bread_err1; + offset = xlog_align(log, tail_blk, 1, hbp); + rhead = (xlog_rec_header_t *)offset; + error = xlog_valid_rec_header(log, rhead, tail_blk); + if (error) + goto bread_err1; + h_size = INT_GET(rhead->h_size, ARCH_CONVERT); + if ((INT_GET(rhead->h_version, ARCH_CONVERT) + & XLOG_VERSION_2) && + (h_size > XLOG_HEADER_CYCLE_SIZE)) { + hblks = h_size / XLOG_HEADER_CYCLE_SIZE; + if (h_size % XLOG_HEADER_CYCLE_SIZE) + hblks++; + xlog_put_bp(hbp); + hbp = xlog_get_bp(log, hblks); + } else { + hblks = 1; + } + } else { + ASSERT(log->l_sectbb_log == 0); + hblks = 1; + hbp = xlog_get_bp(log, 1); + h_size = XLOG_BIG_RECORD_BSIZE; + } + + if (!hbp) + return ENOMEM; + dbp = xlog_get_bp(log, BTOBB(h_size)); + if (!dbp) { + xlog_put_bp(hbp); + return ENOMEM; + } + + memset(rhash, 0, sizeof(rhash)); + if (tail_blk <= head_blk) { + for (blk_no = tail_blk; blk_no < head_blk; ) { + if ((error = xlog_bread(log, blk_no, hblks, hbp))) + goto bread_err2; + offset = xlog_align(log, blk_no, hblks, hbp); + rhead = (xlog_rec_header_t *)offset; + error = xlog_valid_rec_header(log, rhead, blk_no); + if (error) + goto bread_err2; + + /* blocks in data section */ + bblks = (int)BTOBB(INT_GET(rhead->h_len, ARCH_CONVERT)); + error = xlog_bread(log, blk_no + hblks, bblks, dbp); + if (error) + goto bread_err2; + offset = xlog_align(log, blk_no + hblks, bblks, dbp); + xlog_unpack_data(rhead, offset, log); + if ((error = xlog_recover_process_data(log, + rhash, rhead, offset, pass))) + goto bread_err2; + blk_no += bblks + hblks; + } + } else { + /* + * Perform recovery around the end of the physical log. + * When the head is not on the same cycle number as the tail, + * we can't do a sequential recovery as above. + */ + blk_no = tail_blk; + while (blk_no < log->l_logBBsize) { + /* + * Check for header wrapping around physical end-of-log + */ + offset = NULL; + split_hblks = 0; + wrapped_hblks = 0; + if (blk_no + hblks <= log->l_logBBsize) { + /* Read header in one read */ + error = xlog_bread(log, blk_no, hblks, hbp); + if (error) + goto bread_err2; + offset = xlog_align(log, blk_no, hblks, hbp); + } else { + /* This LR is split across physical log end */ + if (blk_no != log->l_logBBsize) { + /* some data before physical log end */ + ASSERT(blk_no <= INT_MAX); + split_hblks = log->l_logBBsize - (int)blk_no; + ASSERT(split_hblks > 0); + if ((error = xlog_bread(log, blk_no, + split_hblks, hbp))) + goto bread_err2; + offset = xlog_align(log, blk_no, + split_hblks, hbp); + } + /* + * Note: this black magic still works with + * large sector sizes (non-512) only because: + * - we increased the buffer size originally + * by 1 sector giving us enough extra space + * for the second read; + * - the log start is guaranteed to be sector + * aligned; + * - we read the log end (LR header start) + * _first_, then the log start (LR header end) + * - order is important. + */ + bufaddr = XFS_BUF_PTR(hbp); + XFS_BUF_SET_PTR(hbp, + bufaddr + BBTOB(split_hblks), + BBTOB(hblks - split_hblks)); + wrapped_hblks = hblks - split_hblks; + error = xlog_bread(log, 0, wrapped_hblks, hbp); + if (error) + goto bread_err2; + XFS_BUF_SET_PTR(hbp, bufaddr, BBTOB(hblks)); + if (!offset) + offset = xlog_align(log, 0, + wrapped_hblks, hbp); + } + rhead = (xlog_rec_header_t *)offset; + error = xlog_valid_rec_header(log, rhead, + split_hblks ? blk_no : 0); + if (error) + goto bread_err2; + + bblks = (int)BTOBB(INT_GET(rhead->h_len, ARCH_CONVERT)); + blk_no += hblks; + + /* Read in data for log record */ + if (blk_no + bblks <= log->l_logBBsize) { + error = xlog_bread(log, blk_no, bblks, dbp); + if (error) + goto bread_err2; + offset = xlog_align(log, blk_no, bblks, dbp); + } else { + /* This log record is split across the + * physical end of log */ + offset = NULL; + split_bblks = 0; + if (blk_no != log->l_logBBsize) { + /* some data is before the physical + * end of log */ + ASSERT(!wrapped_hblks); + ASSERT(blk_no <= INT_MAX); + split_bblks = + log->l_logBBsize - (int)blk_no; + ASSERT(split_bblks > 0); + if ((error = xlog_bread(log, blk_no, + split_bblks, dbp))) + goto bread_err2; + offset = xlog_align(log, blk_no, + split_bblks, dbp); + } + /* + * Note: this black magic still works with + * large sector sizes (non-512) only because: + * - we increased the buffer size originally + * by 1 sector giving us enough extra space + * for the second read; + * - the log start is guaranteed to be sector + * aligned; + * - we read the log end (LR header start) + * _first_, then the log start (LR header end) + * - order is important. + */ + bufaddr = XFS_BUF_PTR(dbp); + XFS_BUF_SET_PTR(dbp, + bufaddr + BBTOB(split_bblks), + BBTOB(bblks - split_bblks)); + if ((error = xlog_bread(log, wrapped_hblks, + bblks - split_bblks, dbp))) + goto bread_err2; + XFS_BUF_SET_PTR(dbp, bufaddr, h_size); + if (!offset) + offset = xlog_align(log, wrapped_hblks, + bblks - split_bblks, dbp); + } + xlog_unpack_data(rhead, offset, log); + if ((error = xlog_recover_process_data(log, rhash, + rhead, offset, pass))) + goto bread_err2; + blk_no += bblks; + } + + ASSERT(blk_no >= log->l_logBBsize); + blk_no -= log->l_logBBsize; + + /* read first part of physical log */ + while (blk_no < head_blk) { + if ((error = xlog_bread(log, blk_no, hblks, hbp))) + goto bread_err2; + offset = xlog_align(log, blk_no, hblks, hbp); + rhead = (xlog_rec_header_t *)offset; + error = xlog_valid_rec_header(log, rhead, blk_no); + if (error) + goto bread_err2; + bblks = (int)BTOBB(INT_GET(rhead->h_len, ARCH_CONVERT)); + if ((error = xlog_bread(log, blk_no+hblks, bblks, dbp))) + goto bread_err2; + offset = xlog_align(log, blk_no+hblks, bblks, dbp); + xlog_unpack_data(rhead, offset, log); + if ((error = xlog_recover_process_data(log, rhash, + rhead, offset, pass))) + goto bread_err2; + blk_no += bblks + hblks; + } + } + + bread_err2: + xlog_put_bp(dbp); + bread_err1: + xlog_put_bp(hbp); + return error; +} + +/* + * Do the recovery of the log. We actually do this in two phases. + * The two passes are necessary in order to implement the function + * of cancelling a record written into the log. The first pass + * determines those things which have been cancelled, and the + * second pass replays log items normally except for those which + * have been cancelled. The handling of the replay and cancellations + * takes place in the log item type specific routines. + * + * The table of items which have cancel records in the log is allocated + * and freed at this level, since only here do we know when all of + * the log recovery has been completed. + */ +STATIC int +xlog_do_log_recovery( + xlog_t *log, + xfs_daddr_t head_blk, + xfs_daddr_t tail_blk) +{ + int error; + + ASSERT(head_blk != tail_blk); + + /* + * First do a pass to find all of the cancelled buf log items. + * Store them in the buf_cancel_table for use in the second pass. + */ + log->l_buf_cancel_table = + (xfs_buf_cancel_t **)kmem_zalloc(XLOG_BC_TABLE_SIZE * + sizeof(xfs_buf_cancel_t*), + KM_SLEEP); + error = xlog_do_recovery_pass(log, head_blk, tail_blk, + XLOG_RECOVER_PASS1); + if (error != 0) { + kmem_free(log->l_buf_cancel_table, + XLOG_BC_TABLE_SIZE * sizeof(xfs_buf_cancel_t*)); + log->l_buf_cancel_table = NULL; + return error; + } + /* + * Then do a second pass to actually recover the items in the log. + * When it is complete free the table of buf cancel items. + */ + error = xlog_do_recovery_pass(log, head_blk, tail_blk, + XLOG_RECOVER_PASS2); +#ifdef DEBUG + { + int i; + + for (i = 0; i < XLOG_BC_TABLE_SIZE; i++) + ASSERT(log->l_buf_cancel_table[i] == NULL); + } +#endif /* DEBUG */ + + kmem_free(log->l_buf_cancel_table, + XLOG_BC_TABLE_SIZE * sizeof(xfs_buf_cancel_t*)); + log->l_buf_cancel_table = NULL; + + return error; +} + +/* + * Do the actual recovery + */ +STATIC int +xlog_do_recover( + xlog_t *log, + xfs_daddr_t head_blk, + xfs_daddr_t tail_blk) +{ + int error; + xfs_buf_t *bp; + xfs_sb_t *sbp; + + /* + * First replay the images in the log. + */ + error = xlog_do_log_recovery(log, head_blk, tail_blk); + if (error) { + return error; + } + + XFS_bflush(log->l_mp->m_ddev_targp); + + /* + * If IO errors happened during recovery, bail out. + */ + if (XFS_FORCED_SHUTDOWN(log->l_mp)) { + return (EIO); + } + + /* + * We now update the tail_lsn since much of the recovery has completed + * and there may be space available to use. If there were no extent + * or iunlinks, we can free up the entire log and set the tail_lsn to + * be the last_sync_lsn. This was set in xlog_find_tail to be the + * lsn of the last known good LR on disk. If there are extent frees + * or iunlinks they will have some entries in the AIL; so we look at + * the AIL to determine how to set the tail_lsn. + */ + xlog_assign_tail_lsn(log->l_mp); + + /* + * Now that we've finished replaying all buffer and inode + * updates, re-read in the superblock. + */ + bp = xfs_getsb(log->l_mp, 0); + XFS_BUF_UNDONE(bp); + XFS_BUF_READ(bp); + xfsbdstrat(log->l_mp, bp); + if ((error = xfs_iowait(bp))) { + xfs_ioerror_alert("xlog_do_recover", + log->l_mp, bp, XFS_BUF_ADDR(bp)); + ASSERT(0); + xfs_buf_relse(bp); + return error; + } + + /* Convert superblock from on-disk format */ + sbp = &log->l_mp->m_sb; + xfs_xlatesb(XFS_BUF_TO_SBP(bp), sbp, 1, XFS_SB_ALL_BITS); + ASSERT(sbp->sb_magicnum == XFS_SB_MAGIC); + ASSERT(XFS_SB_GOOD_VERSION(sbp)); + xfs_buf_relse(bp); + + xlog_recover_check_summary(log); + + /* Normal transactions can now occur */ + log->l_flags &= ~XLOG_ACTIVE_RECOVERY; + return 0; +} + +/* + * Perform recovery and re-initialize some log variables in xlog_find_tail. + * + * Return error or zero. + */ +int +xlog_recover( + xlog_t *log, + int readonly) +{ + xfs_daddr_t head_blk, tail_blk; + int error; + + /* find the tail of the log */ + if ((error = xlog_find_tail(log, &head_blk, &tail_blk, readonly))) + return error; + + if (tail_blk != head_blk) { + /* There used to be a comment here: + * + * disallow recovery on read-only mounts. note -- mount + * checks for ENOSPC and turns it into an intelligent + * error message. + * ...but this is no longer true. Now, unless you specify + * NORECOVERY (in which case this function would never be + * called), we just go ahead and recover. We do this all + * under the vfs layer, so we can get away with it unless + * the device itself is read-only, in which case we fail. + */ + if ((error = xfs_dev_is_read_only(log->l_mp, + "recovery required"))) { + return error; + } + + cmn_err(CE_NOTE, + "Starting XFS recovery on filesystem: %s (dev: %s)", + log->l_mp->m_fsname, XFS_BUFTARG_NAME(log->l_targ)); + + error = xlog_do_recover(log, head_blk, tail_blk); + log->l_flags |= XLOG_RECOVERY_NEEDED; + } + return error; +} + +/* + * In the first part of recovery we replay inodes and buffers and build + * up the list of extent free items which need to be processed. Here + * we process the extent free items and clean up the on disk unlinked + * inode lists. This is separated from the first part of recovery so + * that the root and real-time bitmap inodes can be read in from disk in + * between the two stages. This is necessary so that we can free space + * in the real-time portion of the file system. + */ +int +xlog_recover_finish( + xlog_t *log, + int mfsi_flags) +{ + /* + * Now we're ready to do the transactions needed for the + * rest of recovery. Start with completing all the extent + * free intent records and then process the unlinked inode + * lists. At this point, we essentially run in normal mode + * except that we're still performing recovery actions + * rather than accepting new requests. + */ + if (log->l_flags & XLOG_RECOVERY_NEEDED) { + xlog_recover_process_efis(log); + /* + * Sync the log to get all the EFIs out of the AIL. + * This isn't absolutely necessary, but it helps in + * case the unlink transactions would have problems + * pushing the EFIs out of the way. + */ + xfs_log_force(log->l_mp, (xfs_lsn_t)0, + (XFS_LOG_FORCE | XFS_LOG_SYNC)); + + if ( (mfsi_flags & XFS_MFSI_NOUNLINK) == 0 ) { + xlog_recover_process_iunlinks(log); + } + + xlog_recover_check_summary(log); + + cmn_err(CE_NOTE, + "Ending XFS recovery on filesystem: %s (dev: %s)", + log->l_mp->m_fsname, XFS_BUFTARG_NAME(log->l_targ)); + log->l_flags &= ~XLOG_RECOVERY_NEEDED; + } else { + cmn_err(CE_DEBUG, + "!Ending clean XFS mount for filesystem: %s", + log->l_mp->m_fsname); + } + return 0; +} + + +#if defined(DEBUG) +/* + * Read all of the agf and agi counters and check that they + * are consistent with the superblock counters. + */ +void +xlog_recover_check_summary( + xlog_t *log) +{ + xfs_mount_t *mp; + xfs_agf_t *agfp; + xfs_agi_t *agip; + xfs_buf_t *agfbp; + xfs_buf_t *agibp; + xfs_daddr_t agfdaddr; + xfs_daddr_t agidaddr; + xfs_buf_t *sbbp; +#ifdef XFS_LOUD_RECOVERY + xfs_sb_t *sbp; +#endif + xfs_agnumber_t agno; + __uint64_t freeblks; + __uint64_t itotal; + __uint64_t ifree; + + mp = log->l_mp; + + freeblks = 0LL; + itotal = 0LL; + ifree = 0LL; + for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { + agfdaddr = XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)); + agfbp = xfs_buf_read(mp->m_ddev_targp, agfdaddr, + XFS_FSS_TO_BB(mp, 1), 0); + if (XFS_BUF_ISERROR(agfbp)) { + xfs_ioerror_alert("xlog_recover_check_summary(agf)", + mp, agfbp, agfdaddr); + } + agfp = XFS_BUF_TO_AGF(agfbp); + ASSERT(XFS_AGF_MAGIC == + INT_GET(agfp->agf_magicnum, ARCH_CONVERT)); + ASSERT(XFS_AGF_GOOD_VERSION( + INT_GET(agfp->agf_versionnum, ARCH_CONVERT))); + ASSERT(INT_GET(agfp->agf_seqno, ARCH_CONVERT) == agno); + + freeblks += INT_GET(agfp->agf_freeblks, ARCH_CONVERT) + + INT_GET(agfp->agf_flcount, ARCH_CONVERT); + xfs_buf_relse(agfbp); + + agidaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)); + agibp = xfs_buf_read(mp->m_ddev_targp, agidaddr, + XFS_FSS_TO_BB(mp, 1), 0); + if (XFS_BUF_ISERROR(agibp)) { + xfs_ioerror_alert("xlog_recover_check_summary(agi)", + mp, agibp, agidaddr); + } + agip = XFS_BUF_TO_AGI(agibp); + ASSERT(XFS_AGI_MAGIC == + INT_GET(agip->agi_magicnum, ARCH_CONVERT)); + ASSERT(XFS_AGI_GOOD_VERSION( + INT_GET(agip->agi_versionnum, ARCH_CONVERT))); + ASSERT(INT_GET(agip->agi_seqno, ARCH_CONVERT) == agno); + + itotal += INT_GET(agip->agi_count, ARCH_CONVERT); + ifree += INT_GET(agip->agi_freecount, ARCH_CONVERT); + xfs_buf_relse(agibp); + } + + sbbp = xfs_getsb(mp, 0); +#ifdef XFS_LOUD_RECOVERY + sbp = &mp->m_sb; + xfs_xlatesb(XFS_BUF_TO_SBP(sbbp), sbp, 1, XFS_SB_ALL_BITS); + cmn_err(CE_NOTE, + "xlog_recover_check_summary: sb_icount %Lu itotal %Lu", + sbp->sb_icount, itotal); + cmn_err(CE_NOTE, + "xlog_recover_check_summary: sb_ifree %Lu itotal %Lu", + sbp->sb_ifree, ifree); + cmn_err(CE_NOTE, + "xlog_recover_check_summary: sb_fdblocks %Lu freeblks %Lu", + sbp->sb_fdblocks, freeblks); +#if 0 + /* + * This is turned off until I account for the allocation + * btree blocks which live in free space. + */ + ASSERT(sbp->sb_icount == itotal); + ASSERT(sbp->sb_ifree == ifree); + ASSERT(sbp->sb_fdblocks == freeblks); +#endif +#endif + xfs_buf_relse(sbbp); +} +#endif /* DEBUG */ |