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1e5efd72a2
Per the comment in the error case of xfs_reflink_recover_cow, zero out
any error (after shutting down the log) so that we actually kill any new
intent items that might have gotten logged by later recovery steps.
Discovered by xfs/434, which few people actually seem to run.
Fixes: 2c1e31ed5c
("xfs: place intent recovery under NOFS allocation context")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
3552 lines
99 KiB
C
3552 lines
99 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_log.h"
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#include "xfs_log_priv.h"
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#include "xfs_log_recover.h"
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#include "xfs_trans_priv.h"
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#include "xfs_alloc.h"
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#include "xfs_ialloc.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_error.h"
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#include "xfs_buf_item.h"
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#include "xfs_ag.h"
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#include "xfs_quota.h"
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#include "xfs_reflink.h"
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#define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1)
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STATIC int
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xlog_find_zeroed(
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struct xlog *,
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xfs_daddr_t *);
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STATIC int
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xlog_clear_stale_blocks(
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struct xlog *,
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xfs_lsn_t);
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STATIC int
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xlog_do_recovery_pass(
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struct xlog *, xfs_daddr_t, xfs_daddr_t, int, xfs_daddr_t *);
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/*
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* Sector aligned buffer routines for buffer create/read/write/access
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*/
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/*
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* Verify the log-relative block number and length in basic blocks are valid for
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* an operation involving the given XFS log buffer. Returns true if the fields
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* are valid, false otherwise.
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*/
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static inline bool
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xlog_verify_bno(
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struct xlog *log,
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xfs_daddr_t blk_no,
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int bbcount)
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{
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if (blk_no < 0 || blk_no >= log->l_logBBsize)
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return false;
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if (bbcount <= 0 || (blk_no + bbcount) > log->l_logBBsize)
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return false;
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return true;
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}
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/*
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* Allocate a buffer to hold log data. The buffer needs to be able to map to
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* a range of nbblks basic blocks at any valid offset within the log.
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*/
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static char *
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xlog_alloc_buffer(
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struct xlog *log,
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int nbblks)
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{
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/*
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* Pass log block 0 since we don't have an addr yet, buffer will be
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* verified on read.
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*/
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if (XFS_IS_CORRUPT(log->l_mp, !xlog_verify_bno(log, 0, nbblks))) {
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xfs_warn(log->l_mp, "Invalid block length (0x%x) for buffer",
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nbblks);
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return NULL;
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}
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/*
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* We do log I/O in units of log sectors (a power-of-2 multiple of the
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* basic block size), so we round up the requested size to accommodate
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* the basic blocks required for complete log sectors.
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*
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* In addition, the buffer may be used for a non-sector-aligned block
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* offset, in which case an I/O of the requested size could extend
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* beyond the end of the buffer. If the requested size is only 1 basic
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* block it will never straddle a sector boundary, so this won't be an
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* issue. Nor will this be a problem if the log I/O is done in basic
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* blocks (sector size 1). But otherwise we extend the buffer by one
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* extra log sector to ensure there's space to accommodate this
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* possibility.
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*/
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if (nbblks > 1 && log->l_sectBBsize > 1)
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nbblks += log->l_sectBBsize;
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nbblks = round_up(nbblks, log->l_sectBBsize);
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return kvzalloc(BBTOB(nbblks), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
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}
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/*
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* Return the address of the start of the given block number's data
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* in a log buffer. The buffer covers a log sector-aligned region.
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*/
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static inline unsigned int
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xlog_align(
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struct xlog *log,
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xfs_daddr_t blk_no)
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{
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return BBTOB(blk_no & ((xfs_daddr_t)log->l_sectBBsize - 1));
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}
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static int
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xlog_do_io(
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struct xlog *log,
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xfs_daddr_t blk_no,
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unsigned int nbblks,
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char *data,
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enum req_op op)
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{
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int error;
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if (XFS_IS_CORRUPT(log->l_mp, !xlog_verify_bno(log, blk_no, nbblks))) {
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xfs_warn(log->l_mp,
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"Invalid log block/length (0x%llx, 0x%x) for buffer",
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blk_no, nbblks);
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return -EFSCORRUPTED;
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}
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blk_no = round_down(blk_no, log->l_sectBBsize);
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nbblks = round_up(nbblks, log->l_sectBBsize);
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ASSERT(nbblks > 0);
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error = xfs_rw_bdev(log->l_targ->bt_bdev, log->l_logBBstart + blk_no,
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BBTOB(nbblks), data, op);
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if (error && !xlog_is_shutdown(log)) {
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xfs_alert(log->l_mp,
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"log recovery %s I/O error at daddr 0x%llx len %d error %d",
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op == REQ_OP_WRITE ? "write" : "read",
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blk_no, nbblks, error);
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}
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return error;
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}
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STATIC int
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xlog_bread_noalign(
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struct xlog *log,
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xfs_daddr_t blk_no,
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int nbblks,
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char *data)
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{
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return xlog_do_io(log, blk_no, nbblks, data, REQ_OP_READ);
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}
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STATIC int
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xlog_bread(
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struct xlog *log,
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xfs_daddr_t blk_no,
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int nbblks,
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char *data,
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char **offset)
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{
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int error;
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error = xlog_do_io(log, blk_no, nbblks, data, REQ_OP_READ);
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if (!error)
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*offset = data + xlog_align(log, blk_no);
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return error;
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}
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STATIC int
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xlog_bwrite(
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struct xlog *log,
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xfs_daddr_t blk_no,
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int nbblks,
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char *data)
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{
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return xlog_do_io(log, blk_no, nbblks, data, REQ_OP_WRITE);
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}
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#ifdef DEBUG
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/*
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* dump debug superblock and log record information
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*/
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STATIC void
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xlog_header_check_dump(
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xfs_mount_t *mp,
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xlog_rec_header_t *head)
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{
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xfs_debug(mp, "%s: SB : uuid = %pU, fmt = %d",
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__func__, &mp->m_sb.sb_uuid, XLOG_FMT);
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xfs_debug(mp, " log : uuid = %pU, fmt = %d",
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&head->h_fs_uuid, be32_to_cpu(head->h_fmt));
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}
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#else
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#define xlog_header_check_dump(mp, head)
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#endif
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/*
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* check log record header for recovery
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*/
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STATIC int
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xlog_header_check_recover(
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xfs_mount_t *mp,
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xlog_rec_header_t *head)
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{
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ASSERT(head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM));
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/*
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* IRIX doesn't write the h_fmt field and leaves it zeroed
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* (XLOG_FMT_UNKNOWN). This stops us from trying to recover
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* a dirty log created in IRIX.
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*/
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if (XFS_IS_CORRUPT(mp, head->h_fmt != cpu_to_be32(XLOG_FMT))) {
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xfs_warn(mp,
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"dirty log written in incompatible format - can't recover");
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xlog_header_check_dump(mp, head);
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return -EFSCORRUPTED;
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}
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if (XFS_IS_CORRUPT(mp, !uuid_equal(&mp->m_sb.sb_uuid,
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&head->h_fs_uuid))) {
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xfs_warn(mp,
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"dirty log entry has mismatched uuid - can't recover");
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xlog_header_check_dump(mp, head);
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return -EFSCORRUPTED;
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}
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return 0;
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}
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/*
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* read the head block of the log and check the header
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*/
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STATIC int
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xlog_header_check_mount(
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xfs_mount_t *mp,
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xlog_rec_header_t *head)
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{
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ASSERT(head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM));
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if (uuid_is_null(&head->h_fs_uuid)) {
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/*
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* IRIX doesn't write the h_fs_uuid or h_fmt fields. If
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* h_fs_uuid is null, we assume this log was last mounted
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* by IRIX and continue.
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*/
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xfs_warn(mp, "null uuid in log - IRIX style log");
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} else if (XFS_IS_CORRUPT(mp, !uuid_equal(&mp->m_sb.sb_uuid,
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&head->h_fs_uuid))) {
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xfs_warn(mp, "log has mismatched uuid - can't recover");
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xlog_header_check_dump(mp, head);
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return -EFSCORRUPTED;
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}
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return 0;
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}
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/*
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* This routine finds (to an approximation) the first block in the physical
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* log which contains the given cycle. It uses a binary search algorithm.
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* Note that the algorithm can not be perfect because the disk will not
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* necessarily be perfect.
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*/
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STATIC int
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xlog_find_cycle_start(
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struct xlog *log,
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char *buffer,
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xfs_daddr_t first_blk,
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xfs_daddr_t *last_blk,
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uint cycle)
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{
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char *offset;
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xfs_daddr_t mid_blk;
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xfs_daddr_t end_blk;
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uint mid_cycle;
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int error;
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end_blk = *last_blk;
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mid_blk = BLK_AVG(first_blk, end_blk);
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while (mid_blk != first_blk && mid_blk != end_blk) {
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error = xlog_bread(log, mid_blk, 1, buffer, &offset);
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if (error)
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return error;
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mid_cycle = xlog_get_cycle(offset);
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if (mid_cycle == cycle)
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end_blk = mid_blk; /* last_half_cycle == mid_cycle */
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else
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first_blk = mid_blk; /* first_half_cycle == mid_cycle */
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mid_blk = BLK_AVG(first_blk, end_blk);
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}
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ASSERT((mid_blk == first_blk && mid_blk+1 == end_blk) ||
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(mid_blk == end_blk && mid_blk-1 == first_blk));
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*last_blk = end_blk;
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return 0;
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}
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/*
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* Check that a range of blocks does not contain stop_on_cycle_no.
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* Fill in *new_blk with the block offset where such a block is
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* found, or with -1 (an invalid block number) if there is no such
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* block in the range. The scan needs to occur from front to back
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* and the pointer into the region must be updated since a later
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* routine will need to perform another test.
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*/
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STATIC int
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xlog_find_verify_cycle(
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struct xlog *log,
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xfs_daddr_t start_blk,
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int nbblks,
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uint stop_on_cycle_no,
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xfs_daddr_t *new_blk)
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{
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xfs_daddr_t i, j;
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uint cycle;
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char *buffer;
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xfs_daddr_t bufblks;
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char *buf = NULL;
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int error = 0;
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/*
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* Greedily allocate a buffer big enough to handle the full
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* range of basic blocks we'll be examining. If that fails,
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* try a smaller size. We need to be able to read at least
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* a log sector, or we're out of luck.
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*/
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bufblks = roundup_pow_of_two(nbblks);
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while (bufblks > log->l_logBBsize)
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bufblks >>= 1;
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while (!(buffer = xlog_alloc_buffer(log, bufblks))) {
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bufblks >>= 1;
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if (bufblks < log->l_sectBBsize)
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return -ENOMEM;
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}
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for (i = start_blk; i < start_blk + nbblks; i += bufblks) {
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int bcount;
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bcount = min(bufblks, (start_blk + nbblks - i));
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error = xlog_bread(log, i, bcount, buffer, &buf);
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if (error)
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goto out;
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for (j = 0; j < bcount; j++) {
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cycle = xlog_get_cycle(buf);
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if (cycle == stop_on_cycle_no) {
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*new_blk = i+j;
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goto out;
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}
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buf += BBSIZE;
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}
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}
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*new_blk = -1;
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out:
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kvfree(buffer);
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return error;
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}
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static inline int
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xlog_logrec_hblks(struct xlog *log, struct xlog_rec_header *rh)
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{
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if (xfs_has_logv2(log->l_mp)) {
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int h_size = be32_to_cpu(rh->h_size);
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if ((be32_to_cpu(rh->h_version) & XLOG_VERSION_2) &&
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h_size > XLOG_HEADER_CYCLE_SIZE)
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return DIV_ROUND_UP(h_size, XLOG_HEADER_CYCLE_SIZE);
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}
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return 1;
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}
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|
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/*
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* Potentially backup over partial log record write.
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*
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* In the typical case, last_blk is the number of the block directly after
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* a good log record. Therefore, we subtract one to get the block number
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* of the last block in the given buffer. extra_bblks contains the number
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* of blocks we would have read on a previous read. This happens when the
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* last log record is split over the end of the physical log.
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*
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* extra_bblks is the number of blocks potentially verified on a previous
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* call to this routine.
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*/
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STATIC int
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xlog_find_verify_log_record(
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struct xlog *log,
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xfs_daddr_t start_blk,
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xfs_daddr_t *last_blk,
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int extra_bblks)
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{
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xfs_daddr_t i;
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char *buffer;
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char *offset = NULL;
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xlog_rec_header_t *head = NULL;
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int error = 0;
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int smallmem = 0;
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int num_blks = *last_blk - start_blk;
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int xhdrs;
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ASSERT(start_blk != 0 || *last_blk != start_blk);
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buffer = xlog_alloc_buffer(log, num_blks);
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if (!buffer) {
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buffer = xlog_alloc_buffer(log, 1);
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if (!buffer)
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return -ENOMEM;
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smallmem = 1;
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} else {
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error = xlog_bread(log, start_blk, num_blks, buffer, &offset);
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if (error)
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goto out;
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offset += ((num_blks - 1) << BBSHIFT);
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}
|
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|
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for (i = (*last_blk) - 1; i >= 0; i--) {
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if (i < start_blk) {
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/* valid log record not found */
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xfs_warn(log->l_mp,
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"Log inconsistent (didn't find previous header)");
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ASSERT(0);
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error = -EFSCORRUPTED;
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goto out;
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}
|
|
|
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if (smallmem) {
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error = xlog_bread(log, i, 1, buffer, &offset);
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if (error)
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goto out;
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}
|
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|
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head = (xlog_rec_header_t *)offset;
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|
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if (head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM))
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break;
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|
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if (!smallmem)
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offset -= BBSIZE;
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}
|
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|
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/*
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* We hit the beginning of the physical log & still no header. Return
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* to caller. If caller can handle a return of -1, then this routine
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* will be called again for the end of the physical log.
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*/
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if (i == -1) {
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error = 1;
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goto out;
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}
|
|
|
|
/*
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* We have the final block of the good log (the first block
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* of the log record _before_ the head. So we check the uuid.
|
|
*/
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if ((error = xlog_header_check_mount(log->l_mp, head)))
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goto out;
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|
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/*
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|
* We may have found a log record header before we expected one.
|
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* 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
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* reset last_blk. Only when last_blk points in the middle of a log
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* record do we update last_blk.
|
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*/
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xhdrs = xlog_logrec_hblks(log, head);
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|
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if (*last_blk - i + extra_bblks !=
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BTOBB(be32_to_cpu(head->h_len)) + xhdrs)
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*last_blk = i;
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|
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out:
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kvfree(buffer);
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return error;
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}
|
|
|
|
/*
|
|
* Head is defined to be the point of the log where the next log write
|
|
* could go. This means that incomplete LR writes at the end are
|
|
* eliminated when calculating the head. We aren't guaranteed that previous
|
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* 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.
|
|
*/
|
|
STATIC int
|
|
xlog_find_head(
|
|
struct xlog *log,
|
|
xfs_daddr_t *return_head_blk)
|
|
{
|
|
char *buffer;
|
|
char *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? */
|
|
error = xlog_find_zeroed(log, &first_blk);
|
|
if (error < 0) {
|
|
xfs_warn(log->l_mp, "empty log check failed");
|
|
return error;
|
|
}
|
|
if (error == 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
|
|
*/
|
|
xfs_warn(log->l_mp, "totally zeroed log");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
first_blk = 0; /* get cycle # of 1st block */
|
|
buffer = xlog_alloc_buffer(log, 1);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
error = xlog_bread(log, 0, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
first_half_cycle = xlog_get_cycle(offset);
|
|
|
|
last_blk = head_blk = log_bbnum - 1; /* get cycle # of last block */
|
|
error = xlog_bread(log, last_blk, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
last_half_cycle = xlog_get_cycle(offset);
|
|
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 somewhere 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 ... | 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
|
|
* v binary search stopped here
|
|
* x + 1 ... | x | x + 1 | x ... | x
|
|
* ^ but we want to locate this spot
|
|
* or
|
|
* <---------> less than scan distance
|
|
* x + 1 ... | x ... | x - 1 | x
|
|
* ^ we want to locate this spot
|
|
*/
|
|
stop_on_cycle = last_half_cycle;
|
|
error = xlog_find_cycle_start(log, buffer, first_blk, &head_blk,
|
|
last_half_cycle);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
}
|
|
|
|
/*
|
|
* 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 = min_t(int, log_bbnum, 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 out_free_buffer;
|
|
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.
|
|
*/
|
|
ASSERT(head_blk <= INT_MAX &&
|
|
(xfs_daddr_t) num_scan_bblks >= head_blk);
|
|
start_blk = log_bbnum - (num_scan_bblks - head_blk);
|
|
if ((error = xlog_find_verify_cycle(log, start_blk,
|
|
num_scan_bblks - (int)head_blk,
|
|
(stop_on_cycle - 1), &new_blk)))
|
|
goto out_free_buffer;
|
|
if (new_blk != -1) {
|
|
head_blk = new_blk;
|
|
goto validate_head;
|
|
}
|
|
|
|
/*
|
|
* 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 out_free_buffer;
|
|
if (new_blk != -1)
|
|
head_blk = new_blk;
|
|
}
|
|
|
|
validate_head:
|
|
/*
|
|
* 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 */
|
|
error = xlog_find_verify_log_record(log, start_blk, &head_blk, 0);
|
|
if (error == 1)
|
|
error = -EIO;
|
|
if (error)
|
|
goto out_free_buffer;
|
|
} else {
|
|
start_blk = 0;
|
|
ASSERT(head_blk <= INT_MAX);
|
|
error = xlog_find_verify_log_record(log, start_blk, &head_blk, 0);
|
|
if (error < 0)
|
|
goto out_free_buffer;
|
|
if (error == 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);
|
|
error = xlog_find_verify_log_record(log, start_blk,
|
|
&new_blk, (int)head_blk);
|
|
if (error == 1)
|
|
error = -EIO;
|
|
if (error)
|
|
goto out_free_buffer;
|
|
if (new_blk != log_bbnum)
|
|
head_blk = new_blk;
|
|
} else if (error)
|
|
goto out_free_buffer;
|
|
}
|
|
|
|
kvfree(buffer);
|
|
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;
|
|
|
|
out_free_buffer:
|
|
kvfree(buffer);
|
|
if (error)
|
|
xfs_warn(log->l_mp, "failed to find log head");
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Seek backwards in the log for log record headers.
|
|
*
|
|
* Given a starting log block, walk backwards until we find the provided number
|
|
* of records or hit the provided tail block. The return value is the number of
|
|
* records encountered or a negative error code. The log block and buffer
|
|
* pointer of the last record seen are returned in rblk and rhead respectively.
|
|
*/
|
|
STATIC int
|
|
xlog_rseek_logrec_hdr(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
xfs_daddr_t tail_blk,
|
|
int count,
|
|
char *buffer,
|
|
xfs_daddr_t *rblk,
|
|
struct xlog_rec_header **rhead,
|
|
bool *wrapped)
|
|
{
|
|
int i;
|
|
int error;
|
|
int found = 0;
|
|
char *offset = NULL;
|
|
xfs_daddr_t end_blk;
|
|
|
|
*wrapped = false;
|
|
|
|
/*
|
|
* Walk backwards from the head block until we hit the tail or the first
|
|
* block in the log.
|
|
*/
|
|
end_blk = head_blk > tail_blk ? tail_blk : 0;
|
|
for (i = (int) head_blk - 1; i >= end_blk; i--) {
|
|
error = xlog_bread(log, i, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
if (*(__be32 *) offset == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) {
|
|
*rblk = i;
|
|
*rhead = (struct xlog_rec_header *) offset;
|
|
if (++found == count)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we haven't hit the tail block or the log record header count,
|
|
* start looking again from the end of the physical log. Note that
|
|
* callers can pass head == tail if the tail is not yet known.
|
|
*/
|
|
if (tail_blk >= head_blk && found != count) {
|
|
for (i = log->l_logBBsize - 1; i >= (int) tail_blk; i--) {
|
|
error = xlog_bread(log, i, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
if (*(__be32 *)offset ==
|
|
cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) {
|
|
*wrapped = true;
|
|
*rblk = i;
|
|
*rhead = (struct xlog_rec_header *) offset;
|
|
if (++found == count)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return found;
|
|
|
|
out_error:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Seek forward in the log for log record headers.
|
|
*
|
|
* Given head and tail blocks, walk forward from the tail block until we find
|
|
* the provided number of records or hit the head block. The return value is the
|
|
* number of records encountered or a negative error code. The log block and
|
|
* buffer pointer of the last record seen are returned in rblk and rhead
|
|
* respectively.
|
|
*/
|
|
STATIC int
|
|
xlog_seek_logrec_hdr(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
xfs_daddr_t tail_blk,
|
|
int count,
|
|
char *buffer,
|
|
xfs_daddr_t *rblk,
|
|
struct xlog_rec_header **rhead,
|
|
bool *wrapped)
|
|
{
|
|
int i;
|
|
int error;
|
|
int found = 0;
|
|
char *offset = NULL;
|
|
xfs_daddr_t end_blk;
|
|
|
|
*wrapped = false;
|
|
|
|
/*
|
|
* Walk forward from the tail block until we hit the head or the last
|
|
* block in the log.
|
|
*/
|
|
end_blk = head_blk > tail_blk ? head_blk : log->l_logBBsize - 1;
|
|
for (i = (int) tail_blk; i <= end_blk; i++) {
|
|
error = xlog_bread(log, i, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
if (*(__be32 *) offset == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) {
|
|
*rblk = i;
|
|
*rhead = (struct xlog_rec_header *) offset;
|
|
if (++found == count)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we haven't hit the head block or the log record header count,
|
|
* start looking again from the start of the physical log.
|
|
*/
|
|
if (tail_blk > head_blk && found != count) {
|
|
for (i = 0; i < (int) head_blk; i++) {
|
|
error = xlog_bread(log, i, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
if (*(__be32 *)offset ==
|
|
cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) {
|
|
*wrapped = true;
|
|
*rblk = i;
|
|
*rhead = (struct xlog_rec_header *) offset;
|
|
if (++found == count)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return found;
|
|
|
|
out_error:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Calculate distance from head to tail (i.e., unused space in the log).
|
|
*/
|
|
static inline int
|
|
xlog_tail_distance(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
xfs_daddr_t tail_blk)
|
|
{
|
|
if (head_blk < tail_blk)
|
|
return tail_blk - head_blk;
|
|
|
|
return tail_blk + (log->l_logBBsize - head_blk);
|
|
}
|
|
|
|
/*
|
|
* Verify the log tail. This is particularly important when torn or incomplete
|
|
* writes have been detected near the front of the log and the head has been
|
|
* walked back accordingly.
|
|
*
|
|
* We also have to handle the case where the tail was pinned and the head
|
|
* blocked behind the tail right before a crash. If the tail had been pushed
|
|
* immediately prior to the crash and the subsequent checkpoint was only
|
|
* partially written, it's possible it overwrote the last referenced tail in the
|
|
* log with garbage. This is not a coherency problem because the tail must have
|
|
* been pushed before it can be overwritten, but appears as log corruption to
|
|
* recovery because we have no way to know the tail was updated if the
|
|
* subsequent checkpoint didn't write successfully.
|
|
*
|
|
* Therefore, CRC check the log from tail to head. If a failure occurs and the
|
|
* offending record is within max iclog bufs from the head, walk the tail
|
|
* forward and retry until a valid tail is found or corruption is detected out
|
|
* of the range of a possible overwrite.
|
|
*/
|
|
STATIC int
|
|
xlog_verify_tail(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
xfs_daddr_t *tail_blk,
|
|
int hsize)
|
|
{
|
|
struct xlog_rec_header *thead;
|
|
char *buffer;
|
|
xfs_daddr_t first_bad;
|
|
int error = 0;
|
|
bool wrapped;
|
|
xfs_daddr_t tmp_tail;
|
|
xfs_daddr_t orig_tail = *tail_blk;
|
|
|
|
buffer = xlog_alloc_buffer(log, 1);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Make sure the tail points to a record (returns positive count on
|
|
* success).
|
|
*/
|
|
error = xlog_seek_logrec_hdr(log, head_blk, *tail_blk, 1, buffer,
|
|
&tmp_tail, &thead, &wrapped);
|
|
if (error < 0)
|
|
goto out;
|
|
if (*tail_blk != tmp_tail)
|
|
*tail_blk = tmp_tail;
|
|
|
|
/*
|
|
* Run a CRC check from the tail to the head. We can't just check
|
|
* MAX_ICLOGS records past the tail because the tail may point to stale
|
|
* blocks cleared during the search for the head/tail. These blocks are
|
|
* overwritten with zero-length records and thus record count is not a
|
|
* reliable indicator of the iclog state before a crash.
|
|
*/
|
|
first_bad = 0;
|
|
error = xlog_do_recovery_pass(log, head_blk, *tail_blk,
|
|
XLOG_RECOVER_CRCPASS, &first_bad);
|
|
while ((error == -EFSBADCRC || error == -EFSCORRUPTED) && first_bad) {
|
|
int tail_distance;
|
|
|
|
/*
|
|
* Is corruption within range of the head? If so, retry from
|
|
* the next record. Otherwise return an error.
|
|
*/
|
|
tail_distance = xlog_tail_distance(log, head_blk, first_bad);
|
|
if (tail_distance > BTOBB(XLOG_MAX_ICLOGS * hsize))
|
|
break;
|
|
|
|
/* skip to the next record; returns positive count on success */
|
|
error = xlog_seek_logrec_hdr(log, head_blk, first_bad, 2,
|
|
buffer, &tmp_tail, &thead, &wrapped);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
*tail_blk = tmp_tail;
|
|
first_bad = 0;
|
|
error = xlog_do_recovery_pass(log, head_blk, *tail_blk,
|
|
XLOG_RECOVER_CRCPASS, &first_bad);
|
|
}
|
|
|
|
if (!error && *tail_blk != orig_tail)
|
|
xfs_warn(log->l_mp,
|
|
"Tail block (0x%llx) overwrite detected. Updated to 0x%llx",
|
|
orig_tail, *tail_blk);
|
|
out:
|
|
kvfree(buffer);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Detect and trim torn writes from the head of the log.
|
|
*
|
|
* Storage without sector atomicity guarantees can result in torn writes in the
|
|
* log in the event of a crash. Our only means to detect this scenario is via
|
|
* CRC verification. While we can't always be certain that CRC verification
|
|
* failure is due to a torn write vs. an unrelated corruption, we do know that
|
|
* only a certain number (XLOG_MAX_ICLOGS) of log records can be written out at
|
|
* one time. Therefore, CRC verify up to XLOG_MAX_ICLOGS records at the head of
|
|
* the log and treat failures in this range as torn writes as a matter of
|
|
* policy. In the event of CRC failure, the head is walked back to the last good
|
|
* record in the log and the tail is updated from that record and verified.
|
|
*/
|
|
STATIC int
|
|
xlog_verify_head(
|
|
struct xlog *log,
|
|
xfs_daddr_t *head_blk, /* in/out: unverified head */
|
|
xfs_daddr_t *tail_blk, /* out: tail block */
|
|
char *buffer,
|
|
xfs_daddr_t *rhead_blk, /* start blk of last record */
|
|
struct xlog_rec_header **rhead, /* ptr to last record */
|
|
bool *wrapped) /* last rec. wraps phys. log */
|
|
{
|
|
struct xlog_rec_header *tmp_rhead;
|
|
char *tmp_buffer;
|
|
xfs_daddr_t first_bad;
|
|
xfs_daddr_t tmp_rhead_blk;
|
|
int found;
|
|
int error;
|
|
bool tmp_wrapped;
|
|
|
|
/*
|
|
* Check the head of the log for torn writes. Search backwards from the
|
|
* head until we hit the tail or the maximum number of log record I/Os
|
|
* that could have been in flight at one time. Use a temporary buffer so
|
|
* we don't trash the rhead/buffer pointers from the caller.
|
|
*/
|
|
tmp_buffer = xlog_alloc_buffer(log, 1);
|
|
if (!tmp_buffer)
|
|
return -ENOMEM;
|
|
error = xlog_rseek_logrec_hdr(log, *head_blk, *tail_blk,
|
|
XLOG_MAX_ICLOGS, tmp_buffer,
|
|
&tmp_rhead_blk, &tmp_rhead, &tmp_wrapped);
|
|
kvfree(tmp_buffer);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
/*
|
|
* Now run a CRC verification pass over the records starting at the
|
|
* block found above to the current head. If a CRC failure occurs, the
|
|
* log block of the first bad record is saved in first_bad.
|
|
*/
|
|
error = xlog_do_recovery_pass(log, *head_blk, tmp_rhead_blk,
|
|
XLOG_RECOVER_CRCPASS, &first_bad);
|
|
if ((error == -EFSBADCRC || error == -EFSCORRUPTED) && first_bad) {
|
|
/*
|
|
* We've hit a potential torn write. Reset the error and warn
|
|
* about it.
|
|
*/
|
|
error = 0;
|
|
xfs_warn(log->l_mp,
|
|
"Torn write (CRC failure) detected at log block 0x%llx. Truncating head block from 0x%llx.",
|
|
first_bad, *head_blk);
|
|
|
|
/*
|
|
* Get the header block and buffer pointer for the last good
|
|
* record before the bad record.
|
|
*
|
|
* Note that xlog_find_tail() clears the blocks at the new head
|
|
* (i.e., the records with invalid CRC) if the cycle number
|
|
* matches the current cycle.
|
|
*/
|
|
found = xlog_rseek_logrec_hdr(log, first_bad, *tail_blk, 1,
|
|
buffer, rhead_blk, rhead, wrapped);
|
|
if (found < 0)
|
|
return found;
|
|
if (found == 0) /* XXX: right thing to do here? */
|
|
return -EIO;
|
|
|
|
/*
|
|
* Reset the head block to the starting block of the first bad
|
|
* log record and set the tail block based on the last good
|
|
* record.
|
|
*
|
|
* Bail out if the updated head/tail match as this indicates
|
|
* possible corruption outside of the acceptable
|
|
* (XLOG_MAX_ICLOGS) range. This is a job for xfs_repair...
|
|
*/
|
|
*head_blk = first_bad;
|
|
*tail_blk = BLOCK_LSN(be64_to_cpu((*rhead)->h_tail_lsn));
|
|
if (*head_blk == *tail_blk) {
|
|
ASSERT(0);
|
|
return 0;
|
|
}
|
|
}
|
|
if (error)
|
|
return error;
|
|
|
|
return xlog_verify_tail(log, *head_blk, tail_blk,
|
|
be32_to_cpu((*rhead)->h_size));
|
|
}
|
|
|
|
/*
|
|
* We need to make sure we handle log wrapping properly, so we can't use the
|
|
* calculated logbno directly. Make sure it wraps to the correct bno inside the
|
|
* log.
|
|
*
|
|
* The log is limited to 32 bit sizes, so we use the appropriate modulus
|
|
* operation here and cast it back to a 64 bit daddr on return.
|
|
*/
|
|
static inline xfs_daddr_t
|
|
xlog_wrap_logbno(
|
|
struct xlog *log,
|
|
xfs_daddr_t bno)
|
|
{
|
|
int mod;
|
|
|
|
div_s64_rem(bno, log->l_logBBsize, &mod);
|
|
return mod;
|
|
}
|
|
|
|
/*
|
|
* Check whether the head of the log points to an unmount record. In other
|
|
* words, determine whether the log is clean. If so, update the in-core state
|
|
* appropriately.
|
|
*/
|
|
static int
|
|
xlog_check_unmount_rec(
|
|
struct xlog *log,
|
|
xfs_daddr_t *head_blk,
|
|
xfs_daddr_t *tail_blk,
|
|
struct xlog_rec_header *rhead,
|
|
xfs_daddr_t rhead_blk,
|
|
char *buffer,
|
|
bool *clean)
|
|
{
|
|
struct xlog_op_header *op_head;
|
|
xfs_daddr_t umount_data_blk;
|
|
xfs_daddr_t after_umount_blk;
|
|
int hblks;
|
|
int error;
|
|
char *offset;
|
|
|
|
*clean = false;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
hblks = xlog_logrec_hblks(log, rhead);
|
|
after_umount_blk = xlog_wrap_logbno(log,
|
|
rhead_blk + hblks + BTOBB(be32_to_cpu(rhead->h_len)));
|
|
|
|
if (*head_blk == after_umount_blk &&
|
|
be32_to_cpu(rhead->h_num_logops) == 1) {
|
|
umount_data_blk = xlog_wrap_logbno(log, rhead_blk + hblks);
|
|
error = xlog_bread(log, umount_data_blk, 1, buffer, &offset);
|
|
if (error)
|
|
return error;
|
|
|
|
op_head = (struct xlog_op_header *)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.
|
|
*/
|
|
xlog_assign_atomic_lsn(&log->l_tail_lsn,
|
|
log->l_curr_cycle, after_umount_blk);
|
|
xlog_assign_atomic_lsn(&log->l_last_sync_lsn,
|
|
log->l_curr_cycle, after_umount_blk);
|
|
*tail_blk = after_umount_blk;
|
|
|
|
*clean = true;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
xlog_set_state(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
struct xlog_rec_header *rhead,
|
|
xfs_daddr_t rhead_blk,
|
|
bool bump_cycle)
|
|
{
|
|
/*
|
|
* 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 = rhead_blk;
|
|
log->l_curr_block = (int)head_blk;
|
|
log->l_curr_cycle = be32_to_cpu(rhead->h_cycle);
|
|
if (bump_cycle)
|
|
log->l_curr_cycle++;
|
|
atomic64_set(&log->l_tail_lsn, be64_to_cpu(rhead->h_tail_lsn));
|
|
atomic64_set(&log->l_last_sync_lsn, be64_to_cpu(rhead->h_lsn));
|
|
xlog_assign_grant_head(&log->l_reserve_head.grant, log->l_curr_cycle,
|
|
BBTOB(log->l_curr_block));
|
|
xlog_assign_grant_head(&log->l_write_head.grant, log->l_curr_cycle,
|
|
BBTOB(log->l_curr_block));
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
STATIC int
|
|
xlog_find_tail(
|
|
struct xlog *log,
|
|
xfs_daddr_t *head_blk,
|
|
xfs_daddr_t *tail_blk)
|
|
{
|
|
xlog_rec_header_t *rhead;
|
|
char *offset = NULL;
|
|
char *buffer;
|
|
int error;
|
|
xfs_daddr_t rhead_blk;
|
|
xfs_lsn_t tail_lsn;
|
|
bool wrapped = false;
|
|
bool clean = false;
|
|
|
|
/*
|
|
* Find previous log record
|
|
*/
|
|
if ((error = xlog_find_head(log, head_blk)))
|
|
return error;
|
|
ASSERT(*head_blk < INT_MAX);
|
|
|
|
buffer = xlog_alloc_buffer(log, 1);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
if (*head_blk == 0) { /* special case */
|
|
error = xlog_bread(log, 0, 1, buffer, &offset);
|
|
if (error)
|
|
goto done;
|
|
|
|
if (xlog_get_cycle(offset) == 0) {
|
|
*tail_blk = 0;
|
|
/* leave all other log inited values alone */
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Search backwards through the log looking for the log record header
|
|
* block. This wraps all the way back around to the head so something is
|
|
* seriously wrong if we can't find it.
|
|
*/
|
|
error = xlog_rseek_logrec_hdr(log, *head_blk, *head_blk, 1, buffer,
|
|
&rhead_blk, &rhead, &wrapped);
|
|
if (error < 0)
|
|
goto done;
|
|
if (!error) {
|
|
xfs_warn(log->l_mp, "%s: couldn't find sync record", __func__);
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
*tail_blk = BLOCK_LSN(be64_to_cpu(rhead->h_tail_lsn));
|
|
|
|
/*
|
|
* Set the log state based on the current head record.
|
|
*/
|
|
xlog_set_state(log, *head_blk, rhead, rhead_blk, wrapped);
|
|
tail_lsn = atomic64_read(&log->l_tail_lsn);
|
|
|
|
/*
|
|
* Look for an unmount record at the head of the log. This sets the log
|
|
* state to determine whether recovery is necessary.
|
|
*/
|
|
error = xlog_check_unmount_rec(log, head_blk, tail_blk, rhead,
|
|
rhead_blk, buffer, &clean);
|
|
if (error)
|
|
goto done;
|
|
|
|
/*
|
|
* Verify the log head if the log is not clean (e.g., we have anything
|
|
* but an unmount record at the head). This uses CRC verification to
|
|
* detect and trim torn writes. If discovered, CRC failures are
|
|
* considered torn writes and the log head is trimmed accordingly.
|
|
*
|
|
* Note that we can only run CRC verification when the log is dirty
|
|
* because there's no guarantee that the log data behind an unmount
|
|
* record is compatible with the current architecture.
|
|
*/
|
|
if (!clean) {
|
|
xfs_daddr_t orig_head = *head_blk;
|
|
|
|
error = xlog_verify_head(log, head_blk, tail_blk, buffer,
|
|
&rhead_blk, &rhead, &wrapped);
|
|
if (error)
|
|
goto done;
|
|
|
|
/* update in-core state again if the head changed */
|
|
if (*head_blk != orig_head) {
|
|
xlog_set_state(log, *head_blk, rhead, rhead_blk,
|
|
wrapped);
|
|
tail_lsn = atomic64_read(&log->l_tail_lsn);
|
|
error = xlog_check_unmount_rec(log, head_blk, tail_blk,
|
|
rhead, rhead_blk, buffer,
|
|
&clean);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note that the unmount was clean. If the unmount was not clean, we
|
|
* need to know this to rebuild the superblock counters from the perag
|
|
* headers if we have a filesystem using non-persistent counters.
|
|
*/
|
|
if (clean)
|
|
set_bit(XFS_OPSTATE_CLEAN, &log->l_mp->m_opstate);
|
|
|
|
/*
|
|
* 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_targ))
|
|
error = xlog_clear_stale_blocks(log, tail_lsn);
|
|
|
|
done:
|
|
kvfree(buffer);
|
|
|
|
if (error)
|
|
xfs_warn(log->l_mp, "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
|
|
*/
|
|
STATIC int
|
|
xlog_find_zeroed(
|
|
struct xlog *log,
|
|
xfs_daddr_t *blk_no)
|
|
{
|
|
char *buffer;
|
|
char *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;
|
|
int ret = 1;
|
|
|
|
*blk_no = 0;
|
|
|
|
/* check totally zeroed log */
|
|
buffer = xlog_alloc_buffer(log, 1);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
error = xlog_bread(log, 0, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
first_cycle = xlog_get_cycle(offset);
|
|
if (first_cycle == 0) { /* completely zeroed log */
|
|
*blk_no = 0;
|
|
goto out_free_buffer;
|
|
}
|
|
|
|
/* check partially zeroed log */
|
|
error = xlog_bread(log, log_bbnum-1, 1, buffer, &offset);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
last_cycle = xlog_get_cycle(offset);
|
|
if (last_cycle != 0) { /* log completely written to */
|
|
ret = 0;
|
|
goto out_free_buffer;
|
|
}
|
|
|
|
/* we have a partially zeroed log */
|
|
last_blk = log_bbnum-1;
|
|
error = xlog_find_cycle_start(log, buffer, 0, &last_blk, 0);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
/*
|
|
* 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 out_free_buffer;
|
|
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.
|
|
*/
|
|
error = xlog_find_verify_log_record(log, start_blk, &last_blk, 0);
|
|
if (error == 1)
|
|
error = -EIO;
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
*blk_no = last_blk;
|
|
out_free_buffer:
|
|
kvfree(buffer);
|
|
if (error)
|
|
return error;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
struct xlog *log,
|
|
char *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);
|
|
recp->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
|
|
recp->h_cycle = cpu_to_be32(cycle);
|
|
recp->h_version = cpu_to_be32(
|
|
xfs_has_logv2(log->l_mp) ? 2 : 1);
|
|
recp->h_lsn = cpu_to_be64(xlog_assign_lsn(cycle, block));
|
|
recp->h_tail_lsn = cpu_to_be64(xlog_assign_lsn(tail_cycle, tail_block));
|
|
recp->h_fmt = cpu_to_be32(XLOG_FMT);
|
|
memcpy(&recp->h_fs_uuid, &log->l_mp->m_sb.sb_uuid, sizeof(uuid_t));
|
|
}
|
|
|
|
STATIC int
|
|
xlog_write_log_records(
|
|
struct xlog *log,
|
|
int cycle,
|
|
int start_block,
|
|
int blocks,
|
|
int tail_cycle,
|
|
int tail_block)
|
|
{
|
|
char *offset;
|
|
char *buffer;
|
|
int balign, ealign;
|
|
int sectbb = log->l_sectBBsize;
|
|
int end_block = start_block + blocks;
|
|
int bufblks;
|
|
int error = 0;
|
|
int i, j = 0;
|
|
|
|
/*
|
|
* Greedily allocate a buffer big enough to handle the full
|
|
* range of basic blocks to be written. If that fails, try
|
|
* a smaller size. We need to be able to write at least a
|
|
* log sector, or we're out of luck.
|
|
*/
|
|
bufblks = roundup_pow_of_two(blocks);
|
|
while (bufblks > log->l_logBBsize)
|
|
bufblks >>= 1;
|
|
while (!(buffer = xlog_alloc_buffer(log, bufblks))) {
|
|
bufblks >>= 1;
|
|
if (bufblks < sectbb)
|
|
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 = round_down(start_block, sectbb);
|
|
if (balign != start_block) {
|
|
error = xlog_bread_noalign(log, start_block, 1, buffer);
|
|
if (error)
|
|
goto out_free_buffer;
|
|
|
|
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 = round_down(end_block, sectbb);
|
|
if (j == 0 && (start_block + endcount > ealign)) {
|
|
error = xlog_bread_noalign(log, ealign, sectbb,
|
|
buffer + BBTOB(ealign - start_block));
|
|
if (error)
|
|
break;
|
|
|
|
}
|
|
|
|
offset = buffer + xlog_align(log, start_block);
|
|
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, buffer);
|
|
if (error)
|
|
break;
|
|
start_block += endcount;
|
|
j = 0;
|
|
}
|
|
|
|
out_free_buffer:
|
|
kvfree(buffer);
|
|
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(
|
|
struct xlog *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 (XFS_IS_CORRUPT(log->l_mp,
|
|
head_block < tail_block ||
|
|
head_block >= log->l_logBBsize))
|
|
return -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 (XFS_IS_CORRUPT(log->l_mp,
|
|
head_block >= tail_block ||
|
|
head_cycle != tail_cycle + 1))
|
|
return -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;
|
|
}
|
|
|
|
/*
|
|
* Release the recovered intent item in the AIL that matches the given intent
|
|
* type and intent id.
|
|
*/
|
|
void
|
|
xlog_recover_release_intent(
|
|
struct xlog *log,
|
|
unsigned short intent_type,
|
|
uint64_t intent_id)
|
|
{
|
|
struct xfs_defer_pending *dfp, *n;
|
|
|
|
list_for_each_entry_safe(dfp, n, &log->r_dfops, dfp_list) {
|
|
struct xfs_log_item *lip = dfp->dfp_intent;
|
|
|
|
if (lip->li_type != intent_type)
|
|
continue;
|
|
if (!lip->li_ops->iop_match(lip, intent_id))
|
|
continue;
|
|
|
|
ASSERT(xlog_item_is_intent(lip));
|
|
|
|
xfs_defer_cancel_recovery(log->l_mp, dfp);
|
|
}
|
|
}
|
|
|
|
int
|
|
xlog_recover_iget(
|
|
struct xfs_mount *mp,
|
|
xfs_ino_t ino,
|
|
struct xfs_inode **ipp)
|
|
{
|
|
int error;
|
|
|
|
error = xfs_iget(mp, NULL, ino, 0, 0, ipp);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_qm_dqattach(*ipp);
|
|
if (error) {
|
|
xfs_irele(*ipp);
|
|
return error;
|
|
}
|
|
|
|
if (VFS_I(*ipp)->i_nlink == 0)
|
|
xfs_iflags_set(*ipp, XFS_IRECOVERY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/******************************************************************************
|
|
*
|
|
* Log recover routines
|
|
*
|
|
******************************************************************************
|
|
*/
|
|
static const struct xlog_recover_item_ops *xlog_recover_item_ops[] = {
|
|
&xlog_buf_item_ops,
|
|
&xlog_inode_item_ops,
|
|
&xlog_dquot_item_ops,
|
|
&xlog_quotaoff_item_ops,
|
|
&xlog_icreate_item_ops,
|
|
&xlog_efi_item_ops,
|
|
&xlog_efd_item_ops,
|
|
&xlog_rui_item_ops,
|
|
&xlog_rud_item_ops,
|
|
&xlog_cui_item_ops,
|
|
&xlog_cud_item_ops,
|
|
&xlog_bui_item_ops,
|
|
&xlog_bud_item_ops,
|
|
&xlog_attri_item_ops,
|
|
&xlog_attrd_item_ops,
|
|
};
|
|
|
|
static const struct xlog_recover_item_ops *
|
|
xlog_find_item_ops(
|
|
struct xlog_recover_item *item)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(xlog_recover_item_ops); i++)
|
|
if (ITEM_TYPE(item) == xlog_recover_item_ops[i]->item_type)
|
|
return xlog_recover_item_ops[i];
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Sort the log items in the transaction.
|
|
*
|
|
* The ordering constraints are defined by the inode allocation and unlink
|
|
* behaviour. The rules are:
|
|
*
|
|
* 1. Every item is only logged once in a given transaction. Hence it
|
|
* represents the last logged state of the item. Hence ordering is
|
|
* dependent on the order in which operations need to be performed so
|
|
* required initial conditions are always met.
|
|
*
|
|
* 2. Cancelled buffers are recorded in pass 1 in a separate table and
|
|
* there's nothing to replay from them so we can simply cull them
|
|
* from the transaction. However, we can't do that until after we've
|
|
* replayed all the other items because they may be dependent on the
|
|
* cancelled buffer and replaying the cancelled buffer can remove it
|
|
* form the cancelled buffer table. Hence they have tobe done last.
|
|
*
|
|
* 3. Inode allocation buffers must be replayed before inode items that
|
|
* read the buffer and replay changes into it. For filesystems using the
|
|
* ICREATE transactions, this means XFS_LI_ICREATE objects need to get
|
|
* treated the same as inode allocation buffers as they create and
|
|
* initialise the buffers directly.
|
|
*
|
|
* 4. Inode unlink buffers must be replayed after inode items are replayed.
|
|
* This ensures that inodes are completely flushed to the inode buffer
|
|
* in a "free" state before we remove the unlinked inode list pointer.
|
|
*
|
|
* Hence the ordering needs to be inode allocation buffers first, inode items
|
|
* second, inode unlink buffers third and cancelled buffers last.
|
|
*
|
|
* But there's a problem with that - we can't tell an inode allocation buffer
|
|
* apart from a regular buffer, so we can't separate them. We can, however,
|
|
* tell an inode unlink buffer from the others, and so we can separate them out
|
|
* from all the other buffers and move them to last.
|
|
*
|
|
* Hence, 4 lists, in order from head to tail:
|
|
* - buffer_list for all buffers except cancelled/inode unlink buffers
|
|
* - item_list for all non-buffer items
|
|
* - inode_buffer_list for inode unlink buffers
|
|
* - cancel_list for the cancelled buffers
|
|
*
|
|
* Note that we add objects to the tail of the lists so that first-to-last
|
|
* ordering is preserved within the lists. Adding objects to the head of the
|
|
* list means when we traverse from the head we walk them in last-to-first
|
|
* order. For cancelled buffers and inode unlink buffers this doesn't matter,
|
|
* but for all other items there may be specific ordering that we need to
|
|
* preserve.
|
|
*/
|
|
STATIC int
|
|
xlog_recover_reorder_trans(
|
|
struct xlog *log,
|
|
struct xlog_recover *trans,
|
|
int pass)
|
|
{
|
|
struct xlog_recover_item *item, *n;
|
|
int error = 0;
|
|
LIST_HEAD(sort_list);
|
|
LIST_HEAD(cancel_list);
|
|
LIST_HEAD(buffer_list);
|
|
LIST_HEAD(inode_buffer_list);
|
|
LIST_HEAD(item_list);
|
|
|
|
list_splice_init(&trans->r_itemq, &sort_list);
|
|
list_for_each_entry_safe(item, n, &sort_list, ri_list) {
|
|
enum xlog_recover_reorder fate = XLOG_REORDER_ITEM_LIST;
|
|
|
|
item->ri_ops = xlog_find_item_ops(item);
|
|
if (!item->ri_ops) {
|
|
xfs_warn(log->l_mp,
|
|
"%s: unrecognized type of log operation (%d)",
|
|
__func__, ITEM_TYPE(item));
|
|
ASSERT(0);
|
|
/*
|
|
* return the remaining items back to the transaction
|
|
* item list so they can be freed in caller.
|
|
*/
|
|
if (!list_empty(&sort_list))
|
|
list_splice_init(&sort_list, &trans->r_itemq);
|
|
error = -EFSCORRUPTED;
|
|
break;
|
|
}
|
|
|
|
if (item->ri_ops->reorder)
|
|
fate = item->ri_ops->reorder(item);
|
|
|
|
switch (fate) {
|
|
case XLOG_REORDER_BUFFER_LIST:
|
|
list_move_tail(&item->ri_list, &buffer_list);
|
|
break;
|
|
case XLOG_REORDER_CANCEL_LIST:
|
|
trace_xfs_log_recover_item_reorder_head(log,
|
|
trans, item, pass);
|
|
list_move(&item->ri_list, &cancel_list);
|
|
break;
|
|
case XLOG_REORDER_INODE_BUFFER_LIST:
|
|
list_move(&item->ri_list, &inode_buffer_list);
|
|
break;
|
|
case XLOG_REORDER_ITEM_LIST:
|
|
trace_xfs_log_recover_item_reorder_tail(log,
|
|
trans, item, pass);
|
|
list_move_tail(&item->ri_list, &item_list);
|
|
break;
|
|
}
|
|
}
|
|
|
|
ASSERT(list_empty(&sort_list));
|
|
if (!list_empty(&buffer_list))
|
|
list_splice(&buffer_list, &trans->r_itemq);
|
|
if (!list_empty(&item_list))
|
|
list_splice_tail(&item_list, &trans->r_itemq);
|
|
if (!list_empty(&inode_buffer_list))
|
|
list_splice_tail(&inode_buffer_list, &trans->r_itemq);
|
|
if (!list_empty(&cancel_list))
|
|
list_splice_tail(&cancel_list, &trans->r_itemq);
|
|
return error;
|
|
}
|
|
|
|
void
|
|
xlog_buf_readahead(
|
|
struct xlog *log,
|
|
xfs_daddr_t blkno,
|
|
uint len,
|
|
const struct xfs_buf_ops *ops)
|
|
{
|
|
if (!xlog_is_buffer_cancelled(log, blkno, len))
|
|
xfs_buf_readahead(log->l_mp->m_ddev_targp, blkno, len, ops);
|
|
}
|
|
|
|
/*
|
|
* Create a deferred work structure for resuming and tracking the progress of a
|
|
* log intent item that was found during recovery.
|
|
*/
|
|
void
|
|
xlog_recover_intent_item(
|
|
struct xlog *log,
|
|
struct xfs_log_item *lip,
|
|
xfs_lsn_t lsn,
|
|
const struct xfs_defer_op_type *ops)
|
|
{
|
|
ASSERT(xlog_item_is_intent(lip));
|
|
|
|
xfs_defer_start_recovery(lip, &log->r_dfops, ops);
|
|
|
|
/*
|
|
* Insert the intent into the AIL directly and drop one reference so
|
|
* that finishing or canceling the work will drop the other.
|
|
*/
|
|
xfs_trans_ail_insert(log->l_ailp, lip, lsn);
|
|
lip->li_ops->iop_unpin(lip, 0);
|
|
}
|
|
|
|
STATIC int
|
|
xlog_recover_items_pass2(
|
|
struct xlog *log,
|
|
struct xlog_recover *trans,
|
|
struct list_head *buffer_list,
|
|
struct list_head *item_list)
|
|
{
|
|
struct xlog_recover_item *item;
|
|
int error = 0;
|
|
|
|
list_for_each_entry(item, item_list, ri_list) {
|
|
trace_xfs_log_recover_item_recover(log, trans, item,
|
|
XLOG_RECOVER_PASS2);
|
|
|
|
if (item->ri_ops->commit_pass2)
|
|
error = item->ri_ops->commit_pass2(log, buffer_list,
|
|
item, trans->r_lsn);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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_commit_trans(
|
|
struct xlog *log,
|
|
struct xlog_recover *trans,
|
|
int pass,
|
|
struct list_head *buffer_list)
|
|
{
|
|
int error = 0;
|
|
int items_queued = 0;
|
|
struct xlog_recover_item *item;
|
|
struct xlog_recover_item *next;
|
|
LIST_HEAD (ra_list);
|
|
LIST_HEAD (done_list);
|
|
|
|
#define XLOG_RECOVER_COMMIT_QUEUE_MAX 100
|
|
|
|
hlist_del_init(&trans->r_list);
|
|
|
|
error = xlog_recover_reorder_trans(log, trans, pass);
|
|
if (error)
|
|
return error;
|
|
|
|
list_for_each_entry_safe(item, next, &trans->r_itemq, ri_list) {
|
|
trace_xfs_log_recover_item_recover(log, trans, item, pass);
|
|
|
|
switch (pass) {
|
|
case XLOG_RECOVER_PASS1:
|
|
if (item->ri_ops->commit_pass1)
|
|
error = item->ri_ops->commit_pass1(log, item);
|
|
break;
|
|
case XLOG_RECOVER_PASS2:
|
|
if (item->ri_ops->ra_pass2)
|
|
item->ri_ops->ra_pass2(log, item);
|
|
list_move_tail(&item->ri_list, &ra_list);
|
|
items_queued++;
|
|
if (items_queued >= XLOG_RECOVER_COMMIT_QUEUE_MAX) {
|
|
error = xlog_recover_items_pass2(log, trans,
|
|
buffer_list, &ra_list);
|
|
list_splice_tail_init(&ra_list, &done_list);
|
|
items_queued = 0;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
}
|
|
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (!list_empty(&ra_list)) {
|
|
if (!error)
|
|
error = xlog_recover_items_pass2(log, trans,
|
|
buffer_list, &ra_list);
|
|
list_splice_tail_init(&ra_list, &done_list);
|
|
}
|
|
|
|
if (!list_empty(&done_list))
|
|
list_splice_init(&done_list, &trans->r_itemq);
|
|
|
|
return error;
|
|
}
|
|
|
|
STATIC void
|
|
xlog_recover_add_item(
|
|
struct list_head *head)
|
|
{
|
|
struct xlog_recover_item *item;
|
|
|
|
item = kzalloc(sizeof(struct xlog_recover_item),
|
|
GFP_KERNEL | __GFP_NOFAIL);
|
|
INIT_LIST_HEAD(&item->ri_list);
|
|
list_add_tail(&item->ri_list, head);
|
|
}
|
|
|
|
STATIC int
|
|
xlog_recover_add_to_cont_trans(
|
|
struct xlog *log,
|
|
struct xlog_recover *trans,
|
|
char *dp,
|
|
int len)
|
|
{
|
|
struct xlog_recover_item *item;
|
|
char *ptr, *old_ptr;
|
|
int old_len;
|
|
|
|
/*
|
|
* If the transaction is empty, the header was split across this and the
|
|
* previous record. Copy the rest of the header.
|
|
*/
|
|
if (list_empty(&trans->r_itemq)) {
|
|
ASSERT(len <= sizeof(struct xfs_trans_header));
|
|
if (len > sizeof(struct xfs_trans_header)) {
|
|
xfs_warn(log->l_mp, "%s: bad header length", __func__);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
xlog_recover_add_item(&trans->r_itemq);
|
|
ptr = (char *)&trans->r_theader +
|
|
sizeof(struct xfs_trans_header) - len;
|
|
memcpy(ptr, dp, len);
|
|
return 0;
|
|
}
|
|
|
|
/* take the tail entry */
|
|
item = list_entry(trans->r_itemq.prev, struct xlog_recover_item,
|
|
ri_list);
|
|
|
|
old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
|
|
old_len = item->ri_buf[item->ri_cnt-1].i_len;
|
|
|
|
ptr = kvrealloc(old_ptr, old_len, len + old_len, GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
memcpy(&ptr[old_len], dp, len);
|
|
item->ri_buf[item->ri_cnt-1].i_len += len;
|
|
item->ri_buf[item->ri_cnt-1].i_addr = ptr;
|
|
trace_xfs_log_recover_item_add_cont(log, trans, item, 0);
|
|
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(
|
|
struct xlog *log,
|
|
struct xlog_recover *trans,
|
|
char *dp,
|
|
int len)
|
|
{
|
|
struct xfs_inode_log_format *in_f; /* any will do */
|
|
struct xlog_recover_item *item;
|
|
char *ptr;
|
|
|
|
if (!len)
|
|
return 0;
|
|
if (list_empty(&trans->r_itemq)) {
|
|
/* we need to catch log corruptions here */
|
|
if (*(uint *)dp != XFS_TRANS_HEADER_MAGIC) {
|
|
xfs_warn(log->l_mp, "%s: bad header magic number",
|
|
__func__);
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (len > sizeof(struct xfs_trans_header)) {
|
|
xfs_warn(log->l_mp, "%s: bad header length", __func__);
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/*
|
|
* The transaction header can be arbitrarily split across op
|
|
* records. If we don't have the whole thing here, copy what we
|
|
* do have and handle the rest in the next record.
|
|
*/
|
|
if (len == sizeof(struct xfs_trans_header))
|
|
xlog_recover_add_item(&trans->r_itemq);
|
|
memcpy(&trans->r_theader, dp, len);
|
|
return 0;
|
|
}
|
|
|
|
ptr = xlog_kvmalloc(len);
|
|
memcpy(ptr, dp, len);
|
|
in_f = (struct xfs_inode_log_format *)ptr;
|
|
|
|
/* take the tail entry */
|
|
item = list_entry(trans->r_itemq.prev, struct xlog_recover_item,
|
|
ri_list);
|
|
if (item->ri_total != 0 &&
|
|
item->ri_total == item->ri_cnt) {
|
|
/* tail item is in use, get a new one */
|
|
xlog_recover_add_item(&trans->r_itemq);
|
|
item = list_entry(trans->r_itemq.prev,
|
|
struct xlog_recover_item, ri_list);
|
|
}
|
|
|
|
if (item->ri_total == 0) { /* first region to be added */
|
|
if (in_f->ilf_size == 0 ||
|
|
in_f->ilf_size > XLOG_MAX_REGIONS_IN_ITEM) {
|
|
xfs_warn(log->l_mp,
|
|
"bad number of regions (%d) in inode log format",
|
|
in_f->ilf_size);
|
|
ASSERT(0);
|
|
kvfree(ptr);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
item->ri_total = in_f->ilf_size;
|
|
item->ri_buf = kzalloc(item->ri_total * sizeof(xfs_log_iovec_t),
|
|
GFP_KERNEL | __GFP_NOFAIL);
|
|
}
|
|
|
|
if (item->ri_total <= item->ri_cnt) {
|
|
xfs_warn(log->l_mp,
|
|
"log item region count (%d) overflowed size (%d)",
|
|
item->ri_cnt, item->ri_total);
|
|
ASSERT(0);
|
|
kvfree(ptr);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/* 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++;
|
|
trace_xfs_log_recover_item_add(log, trans, item, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Free up any resources allocated by the transaction
|
|
*
|
|
* Remember that EFIs, EFDs, and IUNLINKs are handled later.
|
|
*/
|
|
STATIC void
|
|
xlog_recover_free_trans(
|
|
struct xlog_recover *trans)
|
|
{
|
|
struct xlog_recover_item *item, *n;
|
|
int i;
|
|
|
|
hlist_del_init(&trans->r_list);
|
|
|
|
list_for_each_entry_safe(item, n, &trans->r_itemq, ri_list) {
|
|
/* Free the regions in the item. */
|
|
list_del(&item->ri_list);
|
|
for (i = 0; i < item->ri_cnt; i++)
|
|
kvfree(item->ri_buf[i].i_addr);
|
|
/* Free the item itself */
|
|
kfree(item->ri_buf);
|
|
kfree(item);
|
|
}
|
|
/* Free the transaction recover structure */
|
|
kfree(trans);
|
|
}
|
|
|
|
/*
|
|
* On error or completion, trans is freed.
|
|
*/
|
|
STATIC int
|
|
xlog_recovery_process_trans(
|
|
struct xlog *log,
|
|
struct xlog_recover *trans,
|
|
char *dp,
|
|
unsigned int len,
|
|
unsigned int flags,
|
|
int pass,
|
|
struct list_head *buffer_list)
|
|
{
|
|
int error = 0;
|
|
bool freeit = false;
|
|
|
|
/* mask off ophdr transaction container flags */
|
|
flags &= ~XLOG_END_TRANS;
|
|
if (flags & XLOG_WAS_CONT_TRANS)
|
|
flags &= ~XLOG_CONTINUE_TRANS;
|
|
|
|
/*
|
|
* Callees must not free the trans structure. We'll decide if we need to
|
|
* free it or not based on the operation being done and it's result.
|
|
*/
|
|
switch (flags) {
|
|
/* expected flag values */
|
|
case 0:
|
|
case XLOG_CONTINUE_TRANS:
|
|
error = xlog_recover_add_to_trans(log, trans, dp, len);
|
|
break;
|
|
case XLOG_WAS_CONT_TRANS:
|
|
error = xlog_recover_add_to_cont_trans(log, trans, dp, len);
|
|
break;
|
|
case XLOG_COMMIT_TRANS:
|
|
error = xlog_recover_commit_trans(log, trans, pass,
|
|
buffer_list);
|
|
/* success or fail, we are now done with this transaction. */
|
|
freeit = true;
|
|
break;
|
|
|
|
/* unexpected flag values */
|
|
case XLOG_UNMOUNT_TRANS:
|
|
/* just skip trans */
|
|
xfs_warn(log->l_mp, "%s: Unmount LR", __func__);
|
|
freeit = true;
|
|
break;
|
|
case XLOG_START_TRANS:
|
|
default:
|
|
xfs_warn(log->l_mp, "%s: bad flag 0x%x", __func__, flags);
|
|
ASSERT(0);
|
|
error = -EFSCORRUPTED;
|
|
break;
|
|
}
|
|
if (error || freeit)
|
|
xlog_recover_free_trans(trans);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Lookup the transaction recovery structure associated with the ID in the
|
|
* current ophdr. If the transaction doesn't exist and the start flag is set in
|
|
* the ophdr, then allocate a new transaction for future ID matches to find.
|
|
* Either way, return what we found during the lookup - an existing transaction
|
|
* or nothing.
|
|
*/
|
|
STATIC struct xlog_recover *
|
|
xlog_recover_ophdr_to_trans(
|
|
struct hlist_head rhash[],
|
|
struct xlog_rec_header *rhead,
|
|
struct xlog_op_header *ohead)
|
|
{
|
|
struct xlog_recover *trans;
|
|
xlog_tid_t tid;
|
|
struct hlist_head *rhp;
|
|
|
|
tid = be32_to_cpu(ohead->oh_tid);
|
|
rhp = &rhash[XLOG_RHASH(tid)];
|
|
hlist_for_each_entry(trans, rhp, r_list) {
|
|
if (trans->r_log_tid == tid)
|
|
return trans;
|
|
}
|
|
|
|
/*
|
|
* skip over non-start transaction headers - we could be
|
|
* processing slack space before the next transaction starts
|
|
*/
|
|
if (!(ohead->oh_flags & XLOG_START_TRANS))
|
|
return NULL;
|
|
|
|
ASSERT(be32_to_cpu(ohead->oh_len) == 0);
|
|
|
|
/*
|
|
* This is a new transaction so allocate a new recovery container to
|
|
* hold the recovery ops that will follow.
|
|
*/
|
|
trans = kzalloc(sizeof(struct xlog_recover), GFP_KERNEL | __GFP_NOFAIL);
|
|
trans->r_log_tid = tid;
|
|
trans->r_lsn = be64_to_cpu(rhead->h_lsn);
|
|
INIT_LIST_HEAD(&trans->r_itemq);
|
|
INIT_HLIST_NODE(&trans->r_list);
|
|
hlist_add_head(&trans->r_list, rhp);
|
|
|
|
/*
|
|
* Nothing more to do for this ophdr. Items to be added to this new
|
|
* transaction will be in subsequent ophdr containers.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
STATIC int
|
|
xlog_recover_process_ophdr(
|
|
struct xlog *log,
|
|
struct hlist_head rhash[],
|
|
struct xlog_rec_header *rhead,
|
|
struct xlog_op_header *ohead,
|
|
char *dp,
|
|
char *end,
|
|
int pass,
|
|
struct list_head *buffer_list)
|
|
{
|
|
struct xlog_recover *trans;
|
|
unsigned int len;
|
|
int error;
|
|
|
|
/* Do we understand who wrote this op? */
|
|
if (ohead->oh_clientid != XFS_TRANSACTION &&
|
|
ohead->oh_clientid != XFS_LOG) {
|
|
xfs_warn(log->l_mp, "%s: bad clientid 0x%x",
|
|
__func__, ohead->oh_clientid);
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/*
|
|
* Check the ophdr contains all the data it is supposed to contain.
|
|
*/
|
|
len = be32_to_cpu(ohead->oh_len);
|
|
if (dp + len > end) {
|
|
xfs_warn(log->l_mp, "%s: bad length 0x%x", __func__, len);
|
|
WARN_ON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
trans = xlog_recover_ophdr_to_trans(rhash, rhead, ohead);
|
|
if (!trans) {
|
|
/* nothing to do, so skip over this ophdr */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The recovered buffer queue is drained only once we know that all
|
|
* recovery items for the current LSN have been processed. This is
|
|
* required because:
|
|
*
|
|
* - Buffer write submission updates the metadata LSN of the buffer.
|
|
* - Log recovery skips items with a metadata LSN >= the current LSN of
|
|
* the recovery item.
|
|
* - Separate recovery items against the same metadata buffer can share
|
|
* a current LSN. I.e., consider that the LSN of a recovery item is
|
|
* defined as the starting LSN of the first record in which its
|
|
* transaction appears, that a record can hold multiple transactions,
|
|
* and/or that a transaction can span multiple records.
|
|
*
|
|
* In other words, we are allowed to submit a buffer from log recovery
|
|
* once per current LSN. Otherwise, we may incorrectly skip recovery
|
|
* items and cause corruption.
|
|
*
|
|
* We don't know up front whether buffers are updated multiple times per
|
|
* LSN. Therefore, track the current LSN of each commit log record as it
|
|
* is processed and drain the queue when it changes. Use commit records
|
|
* because they are ordered correctly by the logging code.
|
|
*/
|
|
if (log->l_recovery_lsn != trans->r_lsn &&
|
|
ohead->oh_flags & XLOG_COMMIT_TRANS) {
|
|
error = xfs_buf_delwri_submit(buffer_list);
|
|
if (error)
|
|
return error;
|
|
log->l_recovery_lsn = trans->r_lsn;
|
|
}
|
|
|
|
return xlog_recovery_process_trans(log, trans, dp, len,
|
|
ohead->oh_flags, pass, buffer_list);
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
struct xlog *log,
|
|
struct hlist_head rhash[],
|
|
struct xlog_rec_header *rhead,
|
|
char *dp,
|
|
int pass,
|
|
struct list_head *buffer_list)
|
|
{
|
|
struct xlog_op_header *ohead;
|
|
char *end;
|
|
int num_logops;
|
|
int error;
|
|
|
|
end = dp + be32_to_cpu(rhead->h_len);
|
|
num_logops = be32_to_cpu(rhead->h_num_logops);
|
|
|
|
/* check the log format matches our own - else we can't recover */
|
|
if (xlog_header_check_recover(log->l_mp, rhead))
|
|
return -EIO;
|
|
|
|
trace_xfs_log_recover_record(log, rhead, pass);
|
|
while ((dp < end) && num_logops) {
|
|
|
|
ohead = (struct xlog_op_header *)dp;
|
|
dp += sizeof(*ohead);
|
|
ASSERT(dp <= end);
|
|
|
|
/* errors will abort recovery */
|
|
error = xlog_recover_process_ophdr(log, rhash, rhead, ohead,
|
|
dp, end, pass, buffer_list);
|
|
if (error)
|
|
return error;
|
|
|
|
dp += be32_to_cpu(ohead->oh_len);
|
|
num_logops--;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Take all the collected deferred ops and finish them in order. */
|
|
static int
|
|
xlog_finish_defer_ops(
|
|
struct xfs_mount *mp,
|
|
struct list_head *capture_list)
|
|
{
|
|
struct xfs_defer_capture *dfc, *next;
|
|
struct xfs_trans *tp;
|
|
int error = 0;
|
|
|
|
list_for_each_entry_safe(dfc, next, capture_list, dfc_list) {
|
|
struct xfs_trans_res resv;
|
|
struct xfs_defer_resources dres;
|
|
|
|
/*
|
|
* Create a new transaction reservation from the captured
|
|
* information. Set logcount to 1 to force the new transaction
|
|
* to regrant every roll so that we can make forward progress
|
|
* in recovery no matter how full the log might be.
|
|
*/
|
|
resv.tr_logres = dfc->dfc_logres;
|
|
resv.tr_logcount = 1;
|
|
resv.tr_logflags = XFS_TRANS_PERM_LOG_RES;
|
|
|
|
error = xfs_trans_alloc(mp, &resv, dfc->dfc_blkres,
|
|
dfc->dfc_rtxres, XFS_TRANS_RESERVE, &tp);
|
|
if (error) {
|
|
xlog_force_shutdown(mp->m_log, SHUTDOWN_LOG_IO_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Transfer to this new transaction all the dfops we captured
|
|
* from recovering a single intent item.
|
|
*/
|
|
list_del_init(&dfc->dfc_list);
|
|
xfs_defer_ops_continue(dfc, tp, &dres);
|
|
error = xfs_trans_commit(tp);
|
|
xfs_defer_resources_rele(&dres);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
ASSERT(list_empty(capture_list));
|
|
return 0;
|
|
}
|
|
|
|
/* Release all the captured defer ops and capture structures in this list. */
|
|
static void
|
|
xlog_abort_defer_ops(
|
|
struct xfs_mount *mp,
|
|
struct list_head *capture_list)
|
|
{
|
|
struct xfs_defer_capture *dfc;
|
|
struct xfs_defer_capture *next;
|
|
|
|
list_for_each_entry_safe(dfc, next, capture_list, dfc_list) {
|
|
list_del_init(&dfc->dfc_list);
|
|
xfs_defer_ops_capture_abort(mp, dfc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* When this is called, all of the log intent items which did not have
|
|
* corresponding log done items should be in the AIL. What we do now is update
|
|
* the data structures associated with each one.
|
|
*
|
|
* Since we process the log intent items 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 intent item 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 intents are the only things in the AIL. As we
|
|
* process them, however, other items are added to the AIL. Hence we know we
|
|
* have started recovery on all the pending intents when we find an non-intent
|
|
* item in the AIL.
|
|
*/
|
|
STATIC int
|
|
xlog_recover_process_intents(
|
|
struct xlog *log)
|
|
{
|
|
LIST_HEAD(capture_list);
|
|
struct xfs_defer_pending *dfp, *n;
|
|
int error = 0;
|
|
#if defined(DEBUG) || defined(XFS_WARN)
|
|
xfs_lsn_t last_lsn;
|
|
|
|
last_lsn = xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block);
|
|
#endif
|
|
|
|
list_for_each_entry_safe(dfp, n, &log->r_dfops, dfp_list) {
|
|
ASSERT(xlog_item_is_intent(dfp->dfp_intent));
|
|
|
|
/*
|
|
* We should never see a redo item with a LSN higher than
|
|
* the last transaction we found in the log at the start
|
|
* of recovery.
|
|
*/
|
|
ASSERT(XFS_LSN_CMP(last_lsn, dfp->dfp_intent->li_lsn) >= 0);
|
|
|
|
/*
|
|
* NOTE: If your intent processing routine can create more
|
|
* deferred ops, you /must/ attach them to the capture list in
|
|
* the recover routine or else those subsequent intents will be
|
|
* replayed in the wrong order!
|
|
*
|
|
* The recovery function can free the log item, so we must not
|
|
* access dfp->dfp_intent after it returns. It must dispose of
|
|
* @dfp if it returns 0.
|
|
*/
|
|
error = xfs_defer_finish_recovery(log->l_mp, dfp,
|
|
&capture_list);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (error)
|
|
goto err;
|
|
|
|
error = xlog_finish_defer_ops(log->l_mp, &capture_list);
|
|
if (error)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
xlog_abort_defer_ops(log->l_mp, &capture_list);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* A cancel occurs when the mount has failed and we're bailing out. Release all
|
|
* pending log intent items that we haven't started recovery on so they don't
|
|
* pin the AIL.
|
|
*/
|
|
STATIC void
|
|
xlog_recover_cancel_intents(
|
|
struct xlog *log)
|
|
{
|
|
struct xfs_defer_pending *dfp, *n;
|
|
|
|
list_for_each_entry_safe(dfp, n, &log->r_dfops, dfp_list) {
|
|
ASSERT(xlog_item_is_intent(dfp->dfp_intent));
|
|
|
|
xfs_defer_cancel_recovery(log->l_mp, dfp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Transfer ownership of the recovered pending work to the recovery transaction
|
|
* and try to finish the work. If there is more work to be done, the dfp will
|
|
* remain attached to the transaction. If not, the dfp is freed.
|
|
*/
|
|
int
|
|
xlog_recover_finish_intent(
|
|
struct xfs_trans *tp,
|
|
struct xfs_defer_pending *dfp)
|
|
{
|
|
int error;
|
|
|
|
list_move(&dfp->dfp_list, &tp->t_dfops);
|
|
error = xfs_defer_finish_one(tp, dfp);
|
|
if (error == -EAGAIN)
|
|
return 0;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
struct xfs_perag *pag,
|
|
int bucket)
|
|
{
|
|
struct xfs_mount *mp = pag->pag_mount;
|
|
struct xfs_trans *tp;
|
|
struct xfs_agi *agi;
|
|
struct xfs_buf *agibp;
|
|
int offset;
|
|
int error;
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_clearagi, 0, 0, 0, &tp);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
error = xfs_read_agi(pag, tp, &agibp);
|
|
if (error)
|
|
goto out_abort;
|
|
|
|
agi = agibp->b_addr;
|
|
agi->agi_unlinked[bucket] = cpu_to_be32(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));
|
|
|
|
error = xfs_trans_commit(tp);
|
|
if (error)
|
|
goto out_error;
|
|
return;
|
|
|
|
out_abort:
|
|
xfs_trans_cancel(tp);
|
|
out_error:
|
|
xfs_warn(mp, "%s: failed to clear agi %d. Continuing.", __func__,
|
|
pag->pag_agno);
|
|
return;
|
|
}
|
|
|
|
static int
|
|
xlog_recover_iunlink_bucket(
|
|
struct xfs_perag *pag,
|
|
struct xfs_agi *agi,
|
|
int bucket)
|
|
{
|
|
struct xfs_mount *mp = pag->pag_mount;
|
|
struct xfs_inode *prev_ip = NULL;
|
|
struct xfs_inode *ip;
|
|
xfs_agino_t prev_agino, agino;
|
|
int error = 0;
|
|
|
|
agino = be32_to_cpu(agi->agi_unlinked[bucket]);
|
|
while (agino != NULLAGINO) {
|
|
error = xfs_iget(mp, NULL,
|
|
XFS_AGINO_TO_INO(mp, pag->pag_agno, agino),
|
|
0, 0, &ip);
|
|
if (error)
|
|
break;
|
|
|
|
ASSERT(VFS_I(ip)->i_nlink == 0);
|
|
ASSERT(VFS_I(ip)->i_mode != 0);
|
|
xfs_iflags_clear(ip, XFS_IRECOVERY);
|
|
agino = ip->i_next_unlinked;
|
|
|
|
if (prev_ip) {
|
|
ip->i_prev_unlinked = prev_agino;
|
|
xfs_irele(prev_ip);
|
|
|
|
/*
|
|
* Ensure the inode is removed from the unlinked list
|
|
* before we continue so that it won't race with
|
|
* building the in-memory list here. This could be
|
|
* serialised with the agibp lock, but that just
|
|
* serialises via lockstepping and it's much simpler
|
|
* just to flush the inodegc queue and wait for it to
|
|
* complete.
|
|
*/
|
|
error = xfs_inodegc_flush(mp);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
prev_agino = agino;
|
|
prev_ip = ip;
|
|
}
|
|
|
|
if (prev_ip) {
|
|
int error2;
|
|
|
|
ip->i_prev_unlinked = prev_agino;
|
|
xfs_irele(prev_ip);
|
|
|
|
error2 = xfs_inodegc_flush(mp);
|
|
if (error2 && !error)
|
|
return error2;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Recover AGI unlinked lists
|
|
*
|
|
* 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.
|
|
*
|
|
* If everything we touch in the agi processing loop is already in memory, this
|
|
* loop can hold the cpu for a long time. It runs without lock contention,
|
|
* memory allocation contention, the need wait for IO, etc, and so will run
|
|
* until we either run out of inodes to process, run low on memory or we run out
|
|
* of log space.
|
|
*
|
|
* This behaviour is bad for latency on single CPU and non-preemptible kernels,
|
|
* and can prevent other filesystem work (such as CIL pushes) from running. This
|
|
* can lead to deadlocks if the recovery process runs out of log reservation
|
|
* space. Hence we need to yield the CPU when there is other kernel work
|
|
* scheduled on this CPU to ensure other scheduled work can run without undue
|
|
* latency.
|
|
*/
|
|
static void
|
|
xlog_recover_iunlink_ag(
|
|
struct xfs_perag *pag)
|
|
{
|
|
struct xfs_agi *agi;
|
|
struct xfs_buf *agibp;
|
|
int bucket;
|
|
int error;
|
|
|
|
error = xfs_read_agi(pag, NULL, &agibp);
|
|
if (error) {
|
|
/*
|
|
* AGI is b0rked. Don't process it.
|
|
*
|
|
* We should probably mark the filesystem as corrupt after we've
|
|
* recovered all the ag's we can....
|
|
*/
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Unlock the buffer so that it can be acquired in the normal course of
|
|
* the transaction to truncate and free each inode. Because we are not
|
|
* racing with anyone else here for the AGI buffer, we don't even need
|
|
* to hold it locked to read the initial unlinked bucket entries out of
|
|
* the buffer. We keep buffer reference though, so that it stays pinned
|
|
* in memory while we need the buffer.
|
|
*/
|
|
agi = agibp->b_addr;
|
|
xfs_buf_unlock(agibp);
|
|
|
|
for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) {
|
|
error = xlog_recover_iunlink_bucket(pag, agi, bucket);
|
|
if (error) {
|
|
/*
|
|
* Bucket is unrecoverable, so only a repair scan can
|
|
* free the remaining unlinked inodes. Just empty the
|
|
* bucket and remaining inodes on it unreferenced and
|
|
* unfreeable.
|
|
*/
|
|
xlog_recover_clear_agi_bucket(pag, bucket);
|
|
}
|
|
}
|
|
|
|
xfs_buf_rele(agibp);
|
|
}
|
|
|
|
static void
|
|
xlog_recover_process_iunlinks(
|
|
struct xlog *log)
|
|
{
|
|
struct xfs_perag *pag;
|
|
xfs_agnumber_t agno;
|
|
|
|
for_each_perag(log->l_mp, agno, pag)
|
|
xlog_recover_iunlink_ag(pag);
|
|
}
|
|
|
|
STATIC void
|
|
xlog_unpack_data(
|
|
struct xlog_rec_header *rhead,
|
|
char *dp,
|
|
struct xlog *log)
|
|
{
|
|
int i, j, k;
|
|
|
|
for (i = 0; i < BTOBB(be32_to_cpu(rhead->h_len)) &&
|
|
i < (XLOG_HEADER_CYCLE_SIZE / BBSIZE); i++) {
|
|
*(__be32 *)dp = *(__be32 *)&rhead->h_cycle_data[i];
|
|
dp += BBSIZE;
|
|
}
|
|
|
|
if (xfs_has_logv2(log->l_mp)) {
|
|
xlog_in_core_2_t *xhdr = (xlog_in_core_2_t *)rhead;
|
|
for ( ; i < BTOBB(be32_to_cpu(rhead->h_len)); i++) {
|
|
j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
|
|
*(__be32 *)dp = xhdr[j].hic_xheader.xh_cycle_data[k];
|
|
dp += BBSIZE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CRC check, unpack and process a log record.
|
|
*/
|
|
STATIC int
|
|
xlog_recover_process(
|
|
struct xlog *log,
|
|
struct hlist_head rhash[],
|
|
struct xlog_rec_header *rhead,
|
|
char *dp,
|
|
int pass,
|
|
struct list_head *buffer_list)
|
|
{
|
|
__le32 old_crc = rhead->h_crc;
|
|
__le32 crc;
|
|
|
|
crc = xlog_cksum(log, rhead, dp, be32_to_cpu(rhead->h_len));
|
|
|
|
/*
|
|
* Nothing else to do if this is a CRC verification pass. Just return
|
|
* if this a record with a non-zero crc. Unfortunately, mkfs always
|
|
* sets old_crc to 0 so we must consider this valid even on v5 supers.
|
|
* Otherwise, return EFSBADCRC on failure so the callers up the stack
|
|
* know precisely what failed.
|
|
*/
|
|
if (pass == XLOG_RECOVER_CRCPASS) {
|
|
if (old_crc && crc != old_crc)
|
|
return -EFSBADCRC;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We're in the normal recovery path. Issue a warning if and only if the
|
|
* CRC in the header is non-zero. This is an advisory warning and the
|
|
* zero CRC check prevents warnings from being emitted when upgrading
|
|
* the kernel from one that does not add CRCs by default.
|
|
*/
|
|
if (crc != old_crc) {
|
|
if (old_crc || xfs_has_crc(log->l_mp)) {
|
|
xfs_alert(log->l_mp,
|
|
"log record CRC mismatch: found 0x%x, expected 0x%x.",
|
|
le32_to_cpu(old_crc),
|
|
le32_to_cpu(crc));
|
|
xfs_hex_dump(dp, 32);
|
|
}
|
|
|
|
/*
|
|
* If the filesystem is CRC enabled, this mismatch becomes a
|
|
* fatal log corruption failure.
|
|
*/
|
|
if (xfs_has_crc(log->l_mp)) {
|
|
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
}
|
|
|
|
xlog_unpack_data(rhead, dp, log);
|
|
|
|
return xlog_recover_process_data(log, rhash, rhead, dp, pass,
|
|
buffer_list);
|
|
}
|
|
|
|
STATIC int
|
|
xlog_valid_rec_header(
|
|
struct xlog *log,
|
|
struct xlog_rec_header *rhead,
|
|
xfs_daddr_t blkno,
|
|
int bufsize)
|
|
{
|
|
int hlen;
|
|
|
|
if (XFS_IS_CORRUPT(log->l_mp,
|
|
rhead->h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)))
|
|
return -EFSCORRUPTED;
|
|
if (XFS_IS_CORRUPT(log->l_mp,
|
|
(!rhead->h_version ||
|
|
(be32_to_cpu(rhead->h_version) &
|
|
(~XLOG_VERSION_OKBITS))))) {
|
|
xfs_warn(log->l_mp, "%s: unrecognised log version (%d).",
|
|
__func__, be32_to_cpu(rhead->h_version));
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/*
|
|
* LR body must have data (or it wouldn't have been written)
|
|
* and h_len must not be greater than LR buffer size.
|
|
*/
|
|
hlen = be32_to_cpu(rhead->h_len);
|
|
if (XFS_IS_CORRUPT(log->l_mp, hlen <= 0 || hlen > bufsize))
|
|
return -EFSCORRUPTED;
|
|
|
|
if (XFS_IS_CORRUPT(log->l_mp,
|
|
blkno > log->l_logBBsize || blkno > INT_MAX))
|
|
return -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(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
xfs_daddr_t tail_blk,
|
|
int pass,
|
|
xfs_daddr_t *first_bad) /* out: first bad log rec */
|
|
{
|
|
xlog_rec_header_t *rhead;
|
|
xfs_daddr_t blk_no, rblk_no;
|
|
xfs_daddr_t rhead_blk;
|
|
char *offset;
|
|
char *hbp, *dbp;
|
|
int error = 0, h_size, h_len;
|
|
int error2 = 0;
|
|
int bblks, split_bblks;
|
|
int hblks, split_hblks, wrapped_hblks;
|
|
int i;
|
|
struct hlist_head rhash[XLOG_RHASH_SIZE];
|
|
LIST_HEAD (buffer_list);
|
|
|
|
ASSERT(head_blk != tail_blk);
|
|
blk_no = rhead_blk = tail_blk;
|
|
|
|
for (i = 0; i < XLOG_RHASH_SIZE; i++)
|
|
INIT_HLIST_HEAD(&rhash[i]);
|
|
|
|
/*
|
|
* 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_has_logv2(log->l_mp)) {
|
|
/*
|
|
* 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_alloc_buffer(log, 1);
|
|
if (!hbp)
|
|
return -ENOMEM;
|
|
|
|
error = xlog_bread(log, tail_blk, 1, hbp, &offset);
|
|
if (error)
|
|
goto bread_err1;
|
|
|
|
rhead = (xlog_rec_header_t *)offset;
|
|
|
|
/*
|
|
* xfsprogs has a bug where record length is based on lsunit but
|
|
* h_size (iclog size) is hardcoded to 32k. Now that we
|
|
* unconditionally CRC verify the unmount record, this means the
|
|
* log buffer can be too small for the record and cause an
|
|
* overrun.
|
|
*
|
|
* Detect this condition here. Use lsunit for the buffer size as
|
|
* long as this looks like the mkfs case. Otherwise, return an
|
|
* error to avoid a buffer overrun.
|
|
*/
|
|
h_size = be32_to_cpu(rhead->h_size);
|
|
h_len = be32_to_cpu(rhead->h_len);
|
|
if (h_len > h_size && h_len <= log->l_mp->m_logbsize &&
|
|
rhead->h_num_logops == cpu_to_be32(1)) {
|
|
xfs_warn(log->l_mp,
|
|
"invalid iclog size (%d bytes), using lsunit (%d bytes)",
|
|
h_size, log->l_mp->m_logbsize);
|
|
h_size = log->l_mp->m_logbsize;
|
|
}
|
|
|
|
error = xlog_valid_rec_header(log, rhead, tail_blk, h_size);
|
|
if (error)
|
|
goto bread_err1;
|
|
|
|
hblks = xlog_logrec_hblks(log, rhead);
|
|
if (hblks != 1) {
|
|
kvfree(hbp);
|
|
hbp = xlog_alloc_buffer(log, hblks);
|
|
}
|
|
} else {
|
|
ASSERT(log->l_sectBBsize == 1);
|
|
hblks = 1;
|
|
hbp = xlog_alloc_buffer(log, 1);
|
|
h_size = XLOG_BIG_RECORD_BSIZE;
|
|
}
|
|
|
|
if (!hbp)
|
|
return -ENOMEM;
|
|
dbp = xlog_alloc_buffer(log, BTOBB(h_size));
|
|
if (!dbp) {
|
|
kvfree(hbp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memset(rhash, 0, sizeof(rhash));
|
|
if (tail_blk > head_blk) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
while (blk_no < log->l_logBBsize) {
|
|
/*
|
|
* Check for header wrapping around physical end-of-log
|
|
*/
|
|
offset = hbp;
|
|
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,
|
|
&offset);
|
|
if (error)
|
|
goto bread_err2;
|
|
} 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);
|
|
error = xlog_bread(log, blk_no,
|
|
split_hblks, hbp,
|
|
&offset);
|
|
if (error)
|
|
goto bread_err2;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
wrapped_hblks = hblks - split_hblks;
|
|
error = xlog_bread_noalign(log, 0,
|
|
wrapped_hblks,
|
|
offset + BBTOB(split_hblks));
|
|
if (error)
|
|
goto bread_err2;
|
|
}
|
|
rhead = (xlog_rec_header_t *)offset;
|
|
error = xlog_valid_rec_header(log, rhead,
|
|
split_hblks ? blk_no : 0, h_size);
|
|
if (error)
|
|
goto bread_err2;
|
|
|
|
bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
|
|
blk_no += hblks;
|
|
|
|
/*
|
|
* Read the log record data in multiple reads if it
|
|
* wraps around the end of the log. Note that if the
|
|
* header already wrapped, blk_no could point past the
|
|
* end of the log. The record data is contiguous in
|
|
* that case.
|
|
*/
|
|
if (blk_no + bblks <= log->l_logBBsize ||
|
|
blk_no >= log->l_logBBsize) {
|
|
rblk_no = xlog_wrap_logbno(log, blk_no);
|
|
error = xlog_bread(log, rblk_no, bblks, dbp,
|
|
&offset);
|
|
if (error)
|
|
goto bread_err2;
|
|
} else {
|
|
/* This log record is split across the
|
|
* physical end of log */
|
|
offset = dbp;
|
|
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);
|
|
error = xlog_bread(log, blk_no,
|
|
split_bblks, dbp,
|
|
&offset);
|
|
if (error)
|
|
goto bread_err2;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
error = xlog_bread_noalign(log, 0,
|
|
bblks - split_bblks,
|
|
offset + BBTOB(split_bblks));
|
|
if (error)
|
|
goto bread_err2;
|
|
}
|
|
|
|
error = xlog_recover_process(log, rhash, rhead, offset,
|
|
pass, &buffer_list);
|
|
if (error)
|
|
goto bread_err2;
|
|
|
|
blk_no += bblks;
|
|
rhead_blk = blk_no;
|
|
}
|
|
|
|
ASSERT(blk_no >= log->l_logBBsize);
|
|
blk_no -= log->l_logBBsize;
|
|
rhead_blk = blk_no;
|
|
}
|
|
|
|
/* read first part of physical log */
|
|
while (blk_no < head_blk) {
|
|
error = xlog_bread(log, blk_no, hblks, hbp, &offset);
|
|
if (error)
|
|
goto bread_err2;
|
|
|
|
rhead = (xlog_rec_header_t *)offset;
|
|
error = xlog_valid_rec_header(log, rhead, blk_no, h_size);
|
|
if (error)
|
|
goto bread_err2;
|
|
|
|
/* blocks in data section */
|
|
bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
|
|
error = xlog_bread(log, blk_no+hblks, bblks, dbp,
|
|
&offset);
|
|
if (error)
|
|
goto bread_err2;
|
|
|
|
error = xlog_recover_process(log, rhash, rhead, offset, pass,
|
|
&buffer_list);
|
|
if (error)
|
|
goto bread_err2;
|
|
|
|
blk_no += bblks + hblks;
|
|
rhead_blk = blk_no;
|
|
}
|
|
|
|
bread_err2:
|
|
kvfree(dbp);
|
|
bread_err1:
|
|
kvfree(hbp);
|
|
|
|
/*
|
|
* Submit buffers that have been dirtied by the last record recovered.
|
|
*/
|
|
if (!list_empty(&buffer_list)) {
|
|
if (error) {
|
|
/*
|
|
* If there has been an item recovery error then we
|
|
* cannot allow partial checkpoint writeback to
|
|
* occur. We might have multiple checkpoints with the
|
|
* same start LSN in this buffer list, and partial
|
|
* writeback of a checkpoint in this situation can
|
|
* prevent future recovery of all the changes in the
|
|
* checkpoints at this start LSN.
|
|
*
|
|
* Note: Shutting down the filesystem will result in the
|
|
* delwri submission marking all the buffers stale,
|
|
* completing them and cleaning up _XBF_LOGRECOVERY
|
|
* state without doing any IO.
|
|
*/
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
}
|
|
error2 = xfs_buf_delwri_submit(&buffer_list);
|
|
}
|
|
|
|
if (error && first_bad)
|
|
*first_bad = rhead_blk;
|
|
|
|
/*
|
|
* Transactions are freed at commit time but transactions without commit
|
|
* records on disk are never committed. Free any that may be left in the
|
|
* hash table.
|
|
*/
|
|
for (i = 0; i < XLOG_RHASH_SIZE; i++) {
|
|
struct hlist_node *tmp;
|
|
struct xlog_recover *trans;
|
|
|
|
hlist_for_each_entry_safe(trans, tmp, &rhash[i], r_list)
|
|
xlog_recover_free_trans(trans);
|
|
}
|
|
|
|
return error ? error : error2;
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
struct xlog *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.
|
|
*/
|
|
error = xlog_alloc_buf_cancel_table(log);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xlog_do_recovery_pass(log, head_blk, tail_blk,
|
|
XLOG_RECOVER_PASS1, NULL);
|
|
if (error != 0)
|
|
goto out_cancel;
|
|
|
|
/*
|
|
* 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, NULL);
|
|
if (!error)
|
|
xlog_check_buf_cancel_table(log);
|
|
out_cancel:
|
|
xlog_free_buf_cancel_table(log);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Do the actual recovery
|
|
*/
|
|
STATIC int
|
|
xlog_do_recover(
|
|
struct xlog *log,
|
|
xfs_daddr_t head_blk,
|
|
xfs_daddr_t tail_blk)
|
|
{
|
|
struct xfs_mount *mp = log->l_mp;
|
|
struct xfs_buf *bp = mp->m_sb_bp;
|
|
struct xfs_sb *sbp = &mp->m_sb;
|
|
int error;
|
|
|
|
trace_xfs_log_recover(log, head_blk, tail_blk);
|
|
|
|
/*
|
|
* First replay the images in the log.
|
|
*/
|
|
error = xlog_do_log_recovery(log, head_blk, tail_blk);
|
|
if (error)
|
|
return error;
|
|
|
|
if (xlog_is_shutdown(log))
|
|
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(mp);
|
|
|
|
/*
|
|
* Now that we've finished replaying all buffer and inode updates,
|
|
* re-read the superblock and reverify it.
|
|
*/
|
|
xfs_buf_lock(bp);
|
|
xfs_buf_hold(bp);
|
|
error = _xfs_buf_read(bp, XBF_READ);
|
|
if (error) {
|
|
if (!xlog_is_shutdown(log)) {
|
|
xfs_buf_ioerror_alert(bp, __this_address);
|
|
ASSERT(0);
|
|
}
|
|
xfs_buf_relse(bp);
|
|
return error;
|
|
}
|
|
|
|
/* Convert superblock from on-disk format */
|
|
xfs_sb_from_disk(sbp, bp->b_addr);
|
|
xfs_buf_relse(bp);
|
|
|
|
/* re-initialise in-core superblock and geometry structures */
|
|
mp->m_features |= xfs_sb_version_to_features(sbp);
|
|
xfs_reinit_percpu_counters(mp);
|
|
error = xfs_initialize_perag(mp, sbp->sb_agcount, sbp->sb_dblocks,
|
|
&mp->m_maxagi);
|
|
if (error) {
|
|
xfs_warn(mp, "Failed post-recovery per-ag init: %d", error);
|
|
return error;
|
|
}
|
|
mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
|
|
|
|
/* Normal transactions can now occur */
|
|
clear_bit(XLOG_ACTIVE_RECOVERY, &log->l_opstate);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Perform recovery and re-initialize some log variables in xlog_find_tail.
|
|
*
|
|
* Return error or zero.
|
|
*/
|
|
int
|
|
xlog_recover(
|
|
struct xlog *log)
|
|
{
|
|
xfs_daddr_t head_blk, tail_blk;
|
|
int error;
|
|
|
|
/* find the tail of the log */
|
|
error = xlog_find_tail(log, &head_blk, &tail_blk);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* The superblock was read before the log was available and thus the LSN
|
|
* could not be verified. Check the superblock LSN against the current
|
|
* LSN now that it's known.
|
|
*/
|
|
if (xfs_has_crc(log->l_mp) &&
|
|
!xfs_log_check_lsn(log->l_mp, log->l_mp->m_sb.sb_lsn))
|
|
return -EINVAL;
|
|
|
|
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"))) {
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Version 5 superblock log feature mask validation. We know the
|
|
* log is dirty so check if there are any unknown log features
|
|
* in what we need to recover. If there are unknown features
|
|
* (e.g. unsupported transactions, then simply reject the
|
|
* attempt at recovery before touching anything.
|
|
*/
|
|
if (xfs_sb_is_v5(&log->l_mp->m_sb) &&
|
|
xfs_sb_has_incompat_log_feature(&log->l_mp->m_sb,
|
|
XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
|
|
xfs_warn(log->l_mp,
|
|
"Superblock has unknown incompatible log features (0x%x) enabled.",
|
|
(log->l_mp->m_sb.sb_features_log_incompat &
|
|
XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
|
|
xfs_warn(log->l_mp,
|
|
"The log can not be fully and/or safely recovered by this kernel.");
|
|
xfs_warn(log->l_mp,
|
|
"Please recover the log on a kernel that supports the unknown features.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Delay log recovery if the debug hook is set. This is debug
|
|
* instrumentation to coordinate simulation of I/O failures with
|
|
* log recovery.
|
|
*/
|
|
if (xfs_globals.log_recovery_delay) {
|
|
xfs_notice(log->l_mp,
|
|
"Delaying log recovery for %d seconds.",
|
|
xfs_globals.log_recovery_delay);
|
|
msleep(xfs_globals.log_recovery_delay * 1000);
|
|
}
|
|
|
|
xfs_notice(log->l_mp, "Starting recovery (logdev: %s)",
|
|
log->l_mp->m_logname ? log->l_mp->m_logname
|
|
: "internal");
|
|
|
|
error = xlog_do_recover(log, head_blk, tail_blk);
|
|
set_bit(XLOG_RECOVERY_NEEDED, &log->l_opstate);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* In the first part of recovery we replay inodes and buffers and build up the
|
|
* list of intents which need to be processed. Here we process the intents 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.
|
|
*
|
|
* We run this whole process under GFP_NOFS allocation context. We do a
|
|
* combination of non-transactional and transactional work, yet we really don't
|
|
* want to recurse into the filesystem from direct reclaim during any of this
|
|
* processing. This allows all the recovery code run here not to care about the
|
|
* memory allocation context it is running in.
|
|
*/
|
|
int
|
|
xlog_recover_finish(
|
|
struct xlog *log)
|
|
{
|
|
unsigned int nofs_flags = memalloc_nofs_save();
|
|
int error;
|
|
|
|
error = xlog_recover_process_intents(log);
|
|
if (error) {
|
|
/*
|
|
* Cancel all the unprocessed intent items now so that we don't
|
|
* leave them pinned in the AIL. This can cause the AIL to
|
|
* livelock on the pinned item if anyone tries to push the AIL
|
|
* (inode reclaim does this) before we get around to
|
|
* xfs_log_mount_cancel.
|
|
*/
|
|
xlog_recover_cancel_intents(log);
|
|
xfs_alert(log->l_mp, "Failed to recover intents");
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
goto out_error;
|
|
}
|
|
|
|
/*
|
|
* Sync the log to get all the intents out of the AIL. This isn't
|
|
* absolutely necessary, but it helps in case the unlink transactions
|
|
* would have problems pushing the intents out of the way.
|
|
*/
|
|
xfs_log_force(log->l_mp, XFS_LOG_SYNC);
|
|
|
|
/*
|
|
* Now that we've recovered the log and all the intents, we can clear
|
|
* the log incompat feature bits in the superblock because there's no
|
|
* longer anything to protect. We rely on the AIL push to write out the
|
|
* updated superblock after everything else.
|
|
*/
|
|
if (xfs_clear_incompat_log_features(log->l_mp)) {
|
|
error = xfs_sync_sb(log->l_mp, false);
|
|
if (error < 0) {
|
|
xfs_alert(log->l_mp,
|
|
"Failed to clear log incompat features on recovery");
|
|
goto out_error;
|
|
}
|
|
}
|
|
|
|
xlog_recover_process_iunlinks(log);
|
|
|
|
/*
|
|
* Recover any CoW staging blocks that are still referenced by the
|
|
* ondisk refcount metadata. During mount there cannot be any live
|
|
* staging extents as we have not permitted any user modifications.
|
|
* Therefore, it is safe to free them all right now, even on a
|
|
* read-only mount.
|
|
*/
|
|
error = xfs_reflink_recover_cow(log->l_mp);
|
|
if (error) {
|
|
xfs_alert(log->l_mp,
|
|
"Failed to recover leftover CoW staging extents, err %d.",
|
|
error);
|
|
/*
|
|
* If we get an error here, make sure the log is shut down
|
|
* but return zero so that any log items committed since the
|
|
* end of intents processing can be pushed through the CIL
|
|
* and AIL.
|
|
*/
|
|
xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
|
|
error = 0;
|
|
goto out_error;
|
|
}
|
|
|
|
out_error:
|
|
memalloc_nofs_restore(nofs_flags);
|
|
return error;
|
|
}
|
|
|
|
void
|
|
xlog_recover_cancel(
|
|
struct xlog *log)
|
|
{
|
|
if (xlog_recovery_needed(log))
|
|
xlog_recover_cancel_intents(log);
|
|
}
|
|
|