File: [Development] / xfs-linux / xfs_log_recover.c (download)
Revision 1.55, Fri Mar 31 20:05:41 1995 UTC (22 years, 6 months ago) by doucette
Branch: MAIN
Changes since 1.54: +23 -22
lines
Include xfs header files through sys/fs/xfs_... so logprint is
a little easier to compile.
|
#ident "$Revision: 1.54 $"
#ifdef SIM
#define _KERNEL 1
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysmacros.h>
#include <sys/buf.h>
#include <sys/sema.h>
#include <sys/vnode.h>
#ifdef SIM
#undef _KERNEL
#include <bstring.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#else
#include <sys/systm.h>
#include <sys/conf.h>
#endif
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/ktrace.h>
#include <sys/vfs.h>
#include <stddef.h>
#include <sys/fs/xfs_types.h>
#include <sys/fs/xfs_inum.h>
#include <sys/fs/xfs_log.h>
#include <sys/fs/xfs_ag.h> /* needed by xfs_sb.h */
#include <sys/fs/xfs_sb.h> /* depends on xfs_types.h, xfs_inum.h */
#include <sys/fs/xfs_trans.h>
#include <sys/fs/xfs_mount.h> /* depends on xfs_trans.h & xfs_sb.h */
#include <sys/fs/xfs_bmap_btree.h>
#include <sys/fs/xfs_alloc.h>
#include <sys/fs/xfs_dir.h>
#include <sys/fs/xfs_dinode.h>
#include <sys/fs/xfs_imap.h>
#include <sys/fs/xfs_inode_item.h>
#include <sys/fs/xfs_inode.h>
#include <sys/fs/xfs_ialloc.h>
#include <sys/fs/xfs_error.h>
#include <sys/fs/xfs_log_priv.h> /* depends on all above */
#include <sys/fs/xfs_buf_item.h>
#include <sys/fs/xfs_alloc_btree.h>
#include <sys/fs/xfs_log_recover.h>
#include <sys/fs/xfs_extfree_item.h>
#include <sys/fs/xfs_trans_priv.h>
#ifdef SIM
#include "sim.h" /* must be last include file */
#endif
STATIC int xlog_find_zeroed(xlog_t *log, daddr_t *blk_no);
STATIC void xlog_recover_insert_item_backq(xlog_recover_item_t **q,
xlog_recover_item_t *item);
STATIC void xlog_recover_insert_item_frontq(xlog_recover_item_t **q,
xlog_recover_item_t *item);
#ifdef DEBUG
STATIC void xlog_recover_check_summary(xlog_t *log);
STATIC void xlog_recover_check_ail(xfs_mount_t *mp, xfs_log_item_t *lip,
int gen);
#else
#define xlog_recover_check_summary(log)
#define xlog_recover_check_ail(mp, lip, gen)
#endif
buf_t *
xlog_get_bp(int num_bblks)
{
buf_t *bp;
ASSERT(num_bblks > 0);
bp = ngetrbuf(BBTOB(num_bblks));
return bp;
} /* xlog_get_bp */
void
xlog_put_bp(buf_t *bp)
{
nfreerbuf(bp);
} /* xlog_get_bp */
/*
* nbblks should be uint, but oh well. Just want to catch that 32-bit length.
*/
int
xlog_bread(xlog_t *log,
daddr_t blk_no,
int nbblks,
buf_t *bp)
{
ASSERT(nbblks > 0);
ASSERT(BBTOB(nbblks) <= bp->b_bufsize);
bp->b_blkno = blk_no + log->l_logBBstart;
bp->b_flags = B_READ|B_BUSY;
bp->b_bcount = BBTOB(nbblks);
bp->b_edev = log->l_dev;
#ifndef SIM
bp_dcache_wbinval(bp);
#endif
bdstrat(bmajor(bp->b_edev), bp);
iowait(bp);
if (bp->b_flags & B_ERROR) {
cmn_err(CE_WARN, "xFS: error reading log block #%d",
bp->b_blkno);
ASSERT(0);
return bp->b_error;
}
return 0;
} /* xlog_bread */
/*
* This routine finds (to an approximation) the first block in the physical
* log which contains the given cycle. It uses a binary search algorithm.
* Note that the algorithm can not be perfect because the disk will not
* necessarily be perfect.
*/
STATIC int
xlog_find_cycle_start(xlog_t *log,
buf_t *bp,
daddr_t first_blk,
daddr_t *last_blk,
uint cycle)
{
daddr_t mid_blk;
uint mid_cycle;
int error;
mid_blk = BLK_AVG(first_blk, *last_blk);
while (mid_blk != first_blk && mid_blk != *last_blk) {
if (error = xlog_bread(log, mid_blk, 1, bp))
return error;
mid_cycle = GET_CYCLE(bp->b_dmaaddr);
if (mid_cycle == cycle) {
*last_blk = mid_blk;
/* last_half_cycle == mid_cycle */
} else {
first_blk = mid_blk;
/* first_half_cycle == mid_cycle */
}
mid_blk = BLK_AVG(first_blk, *last_blk);
}
ASSERT((mid_blk == first_blk && mid_blk+1 == *last_blk) ||
(mid_blk == *last_blk && mid_blk-1 == first_blk));
return 0;
} /* xlog_find_cycle_start */
/*
* Check that the range of blocks given all start with the cycle number
* given. The scan needs to occur from front to back and the ptr into the
* region must be updated since a later routine will need to perform another
* test. If the region is completely good, we end up returning the same
* last block number.
*
* Return -1 if we encounter no errors. This is an invalid block number
* since we don't ever expect logs to get this large.
*/
STATIC daddr_t
xlog_find_verify_cycle(caddr_t *bap, /* update ptr as we go */
daddr_t start_blk,
int nbblks,
uint verify_cycle_no)
{
int i;
uint cycle;
for (i=0; i<nbblks; i++) {
cycle = GET_CYCLE(*bap);
if (cycle == verify_cycle_no) {
(*bap) += BBSIZE;
} else {
return (start_blk+i);
}
}
return -1;
} /* xlog_find_verify_cycle */
/*
* Potentially backup over partial log record write.
*
* In the typical case, last_blk is the number of the block directly after
* a good log record. Therefore, we subtract one to get the block number
* of the last block in the given buffer. extra_bblks contains the number
* of blocks we would have read on a previous read. This happens when the
* last log record is split over the end of the physical log.
*
* extra_bblks is the number of blocks potentially verified on a previous
* call to this routine.
*/
STATIC int
xlog_find_verify_log_record(caddr_t ba, /* update ptr as we go */
daddr_t start_blk,
daddr_t *last_blk,
int extra_bblks)
{
xlog_rec_header_t *rhead;
int i;
ASSERT(start_blk != 0 || *last_blk != start_blk);
ba -= BBSIZE;
for (i=(*last_blk)-1; i>=0; i--) {
if (*(uint *)ba == XLOG_HEADER_MAGIC_NUM) {
break;
} else {
if (i < start_blk) {
/* legal log record not found */
xlog_warn("xFS: xlog_find_verify_log_record: need to backup");
ASSERT(0);
return XFS_ERROR(EIO);
}
ba -= BBSIZE;
}
}
/*
* We hit the beginning of the physical log & still no header. Return
* to caller. If caller can handle a return of -1, then this routine
* will be called again for the end of the physical log.
*/
if (i == -1)
return -1;
/*
* We may have found a log record header before we expected one.
* last_blk will be the 1st block # with a given cycle #. We may end
* up reading an entire log record. In this case, we don't want to
* reset last_blk. Only when last_blk points in the middle of a log
* record do we update last_blk.
*/
rhead = (xlog_rec_header_t *)ba;
if (*last_blk - i + extra_bblks != BTOBB(rhead->h_len)+1)
*last_blk = i;
return 0;
} /* xlog_find_verify_log_record */
/*
* Head is defined to be the point of the log where the next log write
* write could go. This means that incomplete LR writes at the end are
* eliminated when calculating the head. We aren't guaranteed that previous
* LR have complete transactions. We only know that a cycle number of
* current cycle number -1 won't be present in the log if we start writing
* from our current block number.
*
* last_blk contains the block number of the first block with a given
* cycle number.
*
* Also called from xfs_log_print.c
*
* Return: zero if normal, non-zero if error.
*/
int
xlog_find_head(xlog_t *log,
daddr_t *head_blk)
{
buf_t *bp, *big_bp;
daddr_t new_blk, first_blk, start_blk, last_blk;
daddr_t num_scan_bblks;
uint first_half_cycle, last_half_cycle;
caddr_t ba;
int error, log_bbnum = log->l_logBBsize;
/* special case freshly mkfs'ed filesystem; return immediately */
if ((error = xlog_find_zeroed(log, &first_blk)) == -1) {
*head_blk = first_blk;
return 0;
} else if (error)
return error;
first_blk = 0; /* get cycle # of 1st block */
bp = xlog_get_bp(1);
if (error = xlog_bread(log, 0, 1, bp))
goto bp_err;
first_half_cycle = GET_CYCLE(bp->b_dmaaddr);
last_blk = log_bbnum-1; /* get cycle # of last block */
if (error = xlog_bread(log, last_blk, 1, bp))
goto bp_err;
last_half_cycle = GET_CYCLE(bp->b_dmaaddr);
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, last_blk can't be set to zero (which makes sense). The below
* math doesn't work out properly with last_blk equal to zero. Instead,
* we set it to log_bbnum which is an illegal block number, but this
* value makes the math correct. If last_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) {
last_blk = log_bbnum;
} else {
/* Find 1st block # with cycle # matching last_half_cycle */
if (error = xlog_find_cycle_start(log, bp, first_blk,
&last_blk, last_half_cycle))
goto bp_err;
}
/*
* Now validate the answer. Scan back some number of maximum possible
* blocks and make sure each one has the expected cycle number.
*/
num_scan_bblks = BTOBB(XLOG_MAX_ICLOGS<<XLOG_MAX_RECORD_BSHIFT);
big_bp = xlog_get_bp(num_scan_bblks);
if (last_blk >= num_scan_bblks) {
/*
* We are guaranteed that the entire check can be performed
* in one buffer.
*/
start_blk = last_blk - num_scan_bblks;
if (error = xlog_bread(log, start_blk, num_scan_bblks, big_bp))
goto big_bp_err;
ba = big_bp->b_dmaaddr;
new_blk = xlog_find_verify_cycle(&ba, start_blk, num_scan_bblks,
first_half_cycle);
if (new_blk != -1)
last_blk = new_blk;
} else { /* need to read 2 parts of log */
/*
* We need to read the log in 2 parts. Scan the physical end of log
* first. If all the cycle numbers are good, we can then move to the
* beginning of the log. last_blk should be a # close to the beginning
* of the log.
*/
start_blk = log_bbnum - num_scan_bblks + last_blk;
if (error = xlog_bread(log, start_blk, num_scan_bblks-last_blk, big_bp))
goto big_bp_err;
ba = big_bp->b_dmaaddr;
new_blk = xlog_find_verify_cycle(&ba, start_blk, num_scan_bblks-last_blk,
last_half_cycle);
if (new_blk != -1) {
last_blk = new_blk;
goto bad_blk;
}
/* Scan beginning of log now. The 1st part is good */
start_blk = 0;
if (error = xlog_bread(log, start_blk, last_blk, big_bp))
goto big_bp_err;
ba = big_bp->b_dmaaddr;
new_blk = xlog_find_verify_cycle(&ba, start_blk, last_blk,
first_half_cycle);
if (new_blk != -1)
last_blk = new_blk;
}
bad_blk:
/*
* Now we need to make sure last_blk is not pointing to a block in
* the middle of a log record.
*/
num_scan_bblks = BTOBB(XLOG_MAX_RECORD_BSIZE);
if (last_blk >= num_scan_bblks) {
start_blk = last_blk - num_scan_bblks; /* don't read last_blk */
if (error = xlog_bread(log, start_blk, num_scan_bblks, big_bp))
goto big_bp_err;
/* start ptr at last block ptr before last_blk */
ba = big_bp->b_dmaaddr + XLOG_MAX_RECORD_BSIZE;
if ((error = xlog_find_verify_log_record(ba,
start_blk,
&last_blk,
0)) == -1) {
error = XFS_ERROR(EIO);
goto big_bp_err;
} else if (error)
goto big_bp_err;
} else {
start_blk = 0;
if (error = xlog_bread(log, start_blk, last_blk, big_bp))
goto big_bp_err;
ba = big_bp->b_dmaaddr + BBTOB(last_blk);
if ((error = xlog_find_verify_log_record(ba,
start_blk,
&last_blk,
0)) == -1) {
/* We hit the beginning of the log during our search */
start_blk = log_bbnum - num_scan_bblks + last_blk;
new_blk = log_bbnum;
if (error = xlog_bread(log, start_blk, log_bbnum - start_blk,
big_bp))
goto big_bp_err;
ba = big_bp->b_dmaaddr + BBTOB(log_bbnum - start_blk);
if ((error = xlog_find_verify_log_record(ba,
start_blk,
&new_blk,
last_blk)) == -1) {
error = XFS_ERROR(EIO);
goto big_bp_err;
} else if (error)
goto big_bp_err;
if (new_blk != log_bbnum)
last_blk = new_blk;
} else if (error)
goto big_bp_err;
}
xlog_put_bp(big_bp);
xlog_put_bp(bp);
if (last_blk == log_bbnum)
*head_blk = 0;
else
*head_blk = last_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;
big_bp_err:
xlog_put_bp(big_bp);
bp_err:
xlog_put_bp(bp);
return error;
} /* xlog_find_head */
#ifndef _KERNEL
/*
* Start is defined to be the block pointing to the oldest valid log record.
* Used by log print code. Don't put in xfs_log_print.c since most of the
* bread routines live in this module only.
*/
int
xlog_print_find_oldest(xlog_t *log,
daddr_t *last_blk)
{
buf_t *bp;
daddr_t first_blk;
uint first_half_cycle, last_half_cycle;
int error;
if (xlog_find_zeroed(log, &first_blk))
return 0;
first_blk = 0; /* read first block */
bp = xlog_get_bp(1);
xlog_bread(log, 0, 1, bp);
first_half_cycle = GET_CYCLE(bp->b_dmaaddr);
*last_blk = log->l_logBBsize-1; /* read last block */
xlog_bread(log, *last_blk, 1, bp);
last_half_cycle = GET_CYCLE(bp->b_dmaaddr);
ASSERT(last_half_cycle != 0);
if (first_half_cycle == last_half_cycle) {/* all cycle nos are same */
*last_blk = 0;
} else { /* have 1st and last; look for middle cycle */
error = xlog_find_cycle_start(log, bp, first_blk,
last_blk, last_half_cycle);
if (error)
return error;
}
xlog_put_bp(bp);
return 0;
} /* xlog_print_find_oldest */
#endif /* _KERNEL */
/*
* Find the sync block number or the tail of the log.
*
* This will be the block number of the last record to have its
* associated buffers synced to disk. Every log record header has
* a sync lsn embedded in it. LSNs hold block numbers, so it is easy
* to get a sync block number. The only concern is to figure out which
* log record header to believe.
*
* The following algorithm uses the log record header with the largest
* lsn. The entire log record does not need to be valid. We only care
* that the header is valid.
*
* We could speed up search by using current head_blk buffer, but it is not
* available.
*/
int
xlog_find_tail(xlog_t *log,
daddr_t *head_blk,
daddr_t *tail_blk)
{
xlog_rec_header_t *rhead;
xlog_op_header_t *op_head;
buf_t *bp;
int error, i, found;
found = error = 0;
/*
* Find previous log record
*/
if (error = xlog_find_head(log, head_blk))
return error;
bp = xlog_get_bp(1);
if (*head_blk == 0) { /* special case */
if (error = xlog_bread(log, 0, 1, bp))
goto bread_err;
if (GET_CYCLE(bp->b_dmaaddr) == 0) {
*tail_blk = 0;
/* leave all other log inited values alone */
goto exit;
}
}
/*
* Search backwards looking for log record header block
*/
for (i=(*head_blk)-1; i>=0; i--) {
if (error = xlog_bread(log, i, 1, bp))
goto bread_err;
if (*(uint *)(bp->b_dmaaddr) == XLOG_HEADER_MAGIC_NUM) {
found = 1;
break;
}
}
/*
* If we haven't found the log record header block, start looking
* again from the end of the physical log. XXXmiken: There should be
* a check here to make sure we didn't search more than N blocks in
* the previous code.
*/
if (!found) {
for (i=log->l_logBBsize-1; i>=(*head_blk); i--) {
if (error = xlog_bread(log, i, 1, bp))
goto bread_err;
if (*(uint*)(bp->b_dmaaddr) == XLOG_HEADER_MAGIC_NUM) {
found = 2;
break;
}
}
}
if (!found) {
xlog_warn("xFS: xlog_find_tail: couldn't find sync record");
ASSERT(0);
return XFS_ERROR(EIO);
}
/* find blk_no of tail of log */
rhead = (xlog_rec_header_t *)bp->b_dmaaddr;
*tail_blk = BLOCK_LSN(rhead->h_tail_lsn);
/*
* Reset log values according to the state of the log when we
* crashed. In the case where head_blk == 0, we bump curr_cycle
* one because the next write starts a new cycle rather than
* continuing the cycle of the last good log record. At this
* point we have guaranteed that all partial log records have been
* accounted for. Therefore, we know that the last good log record
* written was complete and ended exactly on the end boundary
* of the physical log.
*/
log->l_prev_block = i;
log->l_curr_block = *head_blk;
log->l_curr_cycle = rhead->h_cycle;
if (found == 2)
log->l_curr_cycle++;
log->l_tail_lsn = rhead->h_tail_lsn;
log->l_last_sync_lsn = rhead->h_lsn;
log->l_grant_reserve_cycle = log->l_curr_cycle;
log->l_grant_reserve_bytes = BBTOB(log->l_curr_block);
log->l_grant_write_cycle = log->l_curr_cycle;
log->l_grant_write_bytes = BBTOB(log->l_curr_block);
/*
* Look for unmount record. If we find it, then we know there
* was a clean unmount.
*/
if (*head_blk == i+2 && rhead->h_num_logops == 1) {
if (error = xlog_bread(log, i+1, 1, bp))
goto bread_err;
op_head = (xlog_op_header_t *)bp->b_dmaaddr;
if (op_head->oh_flags & XLOG_UNMOUNT_TRANS) {
log->l_tail_lsn =
((long long)log->l_curr_cycle<< 32)|((uint)(i+2));
*tail_blk = i+2;
}
}
bread_err:
exit:
xlog_put_bp(bp);
return error;
} /* xlog_find_tail */
/*
* 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(xlog_t *log,
daddr_t *blk_no)
{
buf_t *bp, *big_bp;
uint first_cycle, last_cycle;
daddr_t new_blk, last_blk, start_blk;
daddr_t num_scan_bblks;
caddr_t ba;
int error, log_bbnum = log->l_logBBsize;
error = 0;
/* check totally zeroed log */
bp = xlog_get_bp(1);
if (error = xlog_bread(log, 0, 1, bp))
goto bp_err;
first_cycle = GET_CYCLE(bp->b_dmaaddr);
if (first_cycle == 0) { /* completely zeroed log */
*blk_no = 0;
xlog_put_bp(bp);
return -1;
}
/* check partially zeroed log */
if (error = xlog_bread(log, log_bbnum-1, 1, bp))
goto bp_err;
last_cycle = GET_CYCLE(bp->b_dmaaddr);
if (last_cycle != 0) { /* log completely written to */
xlog_put_bp(bp);
return 0;
} else if (first_cycle != 1) {
/*
* Hopefully, this will catch the case where someone mkfs's
* over a log partition.
*/
xlog_warn("xFS: (xlog_find_zeroed): last cycle = 0; first cycle != 1");
ASSERT(first_cycle == 1);
return EINVAL;
}
/* we have a partially zeroed log */
last_blk = log_bbnum-1;
if (error = xlog_find_cycle_start(log, bp, 0, &last_blk, 0))
goto bp_err;
/*
* Validate the answer. Because there is no way to guarantee that
* the entire log is made up of log records which are the same size,
* we scan over the defined maximum blocks. At this point, the maximum
* is not chosen to mean anything special. XXXmiken
*/
num_scan_bblks = BTOBB(XLOG_MAX_ICLOGS<<XLOG_MAX_RECORD_BSHIFT);
big_bp = xlog_get_bp(num_scan_bblks);
if (last_blk < num_scan_bblks)
num_scan_bblks = last_blk;
start_blk = last_blk - num_scan_bblks;
if (error = xlog_bread(log, start_blk, num_scan_bblks, big_bp))
goto big_bp_err;
ba = big_bp->b_dmaaddr;
new_blk = xlog_find_verify_cycle(&ba, start_blk, num_scan_bblks, 1);
if (new_blk != -1)
last_blk = new_blk;
/*
* Potentially backup over partial log record write. We don't need
* to search the end of the log because we know it is zero.
*/
if (error = xlog_find_verify_log_record(ba, start_blk, &last_blk, 0))
goto big_bp_err;
*blk_no = last_blk;
big_bp_err:
xlog_put_bp(big_bp);
bp_err:
xlog_put_bp(bp);
if (error)
return error;
return -1;
} /* xlog_find_zeroed */
/******************************************************************************
*
* Log recover routines
*
******************************************************************************
*/
STATIC xlog_recover_t *
xlog_recover_find_tid(xlog_recover_t *q,
xlog_tid_t tid)
{
xlog_recover_t *p = q;
while (p != NULL) {
if (p->r_log_tid == tid)
break;
p = p->r_next;
}
return p;
} /* xlog_recover_find_tid */
STATIC void
xlog_recover_put_hashq(xlog_recover_t **q,
xlog_recover_t *trans)
{
trans->r_next = *q;
*q = trans;
} /* xlog_recover_put_hashq */
STATIC void
xlog_recover_add_item(xlog_recover_item_t **itemq)
{
xlog_recover_item_t *item;
item = kmem_zalloc(sizeof(xlog_recover_item_t), 0);
xlog_recover_insert_item_backq(itemq, item);
} /* xlog_recover_add_item */
STATIC int
xlog_recover_add_to_cont_trans(xlog_recover_t *trans,
caddr_t dp,
int len)
{
xlog_recover_item_t *item;
caddr_t ptr, old_ptr;
int old_len;
item = trans->r_itemq;
if (item == 0) {
/* finish copying rest of trans header */
xlog_recover_add_item(&trans->r_itemq);
ptr = (caddr_t)&trans->r_theader+sizeof(xfs_trans_header_t)-len;
bcopy(dp, ptr, len); /* s, d, l */
return 0;
}
item = item->ri_prev;
old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
old_len = item->ri_buf[item->ri_cnt-1].i_len;
ptr = kmem_realloc(old_ptr, len+old_len, 0);
bcopy(dp , &ptr[old_len], len); /* s, d, l */
item->ri_buf[item->ri_cnt-1].i_len += len;
item->ri_buf[item->ri_cnt-1].i_addr = ptr;
return 0;
} /* xlog_recover_add_to_cont_trans */
/* The next region to add is the start of a new region. It could be
* a whole region or it could be the first part of a new region. Because
* of this, the assumption here is that the type and size fields of all
* format structures fit into the first 32 bits of the structure.
*
* This works because all regions must be 32 bit aligned. Therefore, we
* either have both fields or we have neither field. In the case we have
* neither field, the data part of the region is zero length. We only have
* a log_op_header and can throw away the header since a new one will appear
* later. If we have at least 4 bytes, then we can determine how many regions
* will appear in the current log item.
*/
STATIC int
xlog_recover_add_to_trans(xlog_recover_t *trans,
caddr_t dp,
int len)
{
xfs_inode_log_format_t *in_f; /* any will do */
xlog_recover_item_t *item;
caddr_t ptr;
if (!len)
return 0;
ptr = kmem_zalloc(len, 0);
bcopy(dp, ptr, len);
in_f = (xfs_inode_log_format_t *)ptr;
item = trans->r_itemq;
if (item == 0) {
ASSERT(*(uint *)dp == XFS_TRANS_HEADER_MAGIC);
if (len == sizeof(xfs_trans_header_t))
xlog_recover_add_item(&trans->r_itemq);
bcopy(dp, &trans->r_theader, len); /* s, d, l */
return 0;
}
if (item->ri_prev->ri_total != 0 &&
item->ri_prev->ri_total == item->ri_prev->ri_cnt) {
xlog_recover_add_item(&trans->r_itemq);
}
item = trans->r_itemq;
item = item->ri_prev;
if (item->ri_total == 0) { /* first region to be added */
item->ri_total = in_f->ilf_size;
}
ASSERT(item->ri_total > item->ri_cnt);
/* Description region is ri_buf[0] */
item->ri_buf[item->ri_cnt].i_addr = ptr;
item->ri_buf[item->ri_cnt].i_len = len;
item->ri_cnt++;
return 0;
} /* xlog_recover_add_to_trans */
STATIC void
xlog_recover_new_tid(xlog_recover_t **q,
xlog_tid_t tid,
xfs_lsn_t lsn)
{
xlog_recover_t *trans;
trans = kmem_zalloc(sizeof(xlog_recover_t), 0);
trans->r_log_tid = tid;
trans->r_lsn = lsn;
xlog_recover_put_hashq(q, trans);
} /* xlog_recover_new_tid */
STATIC int
xlog_recover_unlink_tid(xlog_recover_t **q,
xlog_recover_t *trans)
{
xlog_recover_t *tp;
int found = 0;
ASSERT(trans != 0);
if (trans == *q) {
*q = (*q)->r_next;
} else {
tp = *q;
while (tp != 0) {
if (tp->r_next == trans) {
found = 1;
break;
}
tp = tp->r_next;
}
if (!found) {
xlog_warn(
"xFS: xlog_recover_unlink_tid: trans not found");
ASSERT(0);
return XFS_ERROR(EIO);
}
tp->r_next = tp->r_next->r_next;
}
return 0;
} /* xlog_recover_unlink_tid */
#ifdef SIM
STATIC void
xlog_recover_print_trans_head(xlog_recover_t *tr)
{
static char *trans_type[] = {
"",
"SETATTR",
"SETATTR_SIZE",
"INACTIVE",
"CREATE",
"CREATE_TRUNC",
"TRUNCATE_FILE",
"REMOVE",
"LINK",
"RENAME",
"MKDIR",
"RMDIR",
"SYMLINK",
"SET_DMATTRS",
"GROWFS",
"STRAT_WRITE",
"DIOSTRAT"
};
printf("TRANS: tid:0x%x type:%s #items:%d trans:0x%x q:0x%x\n",
tr->r_log_tid, trans_type[tr->r_theader.th_type],
tr->r_theader.th_num_items,
tr->r_theader.th_tid, tr->r_itemq);
} /* xlog_recover_print_trans_head */
void
xlog_recover_print_data(caddr_t p, int len)
{
extern int print_data;
if (print_data) {
uint *dp = (uint *)p;
int nums = len >> 2;
int j = 0;
while (j < nums) {
if ((j % 8) == 0)
printf("%2x ", j);
printf("%8x ", *dp);
dp++;
j++;
if ((j % 8) == 0)
printf("\n");
}
printf("\n");
}
} /* xlog_recover_print_data */
STATIC void
xlog_recover_print_buffer(xlog_recover_item_t *item)
{
xfs_agi_t *agi;
xfs_agf_t *agf;
xfs_buf_log_format_t *f;
caddr_t p;
int len, num, i;
extern int print_buffer;
f = (xfs_buf_log_format_t *)item->ri_buf[0].i_addr;
len = item->ri_buf[0].i_len;
printf(" ");
printf("BUF: #regs:%d start blkno:0x%x len:%d bmap size:%d\n",
f->blf_size, f->blf_blkno, f->blf_len, f->blf_map_size);
num = f->blf_size-1;
i = 1;
while (num-- > 0) {
p = item->ri_buf[i].i_addr;
len = item->ri_buf[i].i_len;
i++;
if (f->blf_blkno == 0) { /* super block */
printf(" SUPER Block Buffer:\n");
if (!print_buffer) continue;
printf(" icount:%lld ifree:%lld ",
*(long long *)(p), *(long long *)(p+8));
printf("fdblks:%lld frext:%lld\n",
*(long long *)(p+16),
*(long long *)(p+24));
} else if (*(uint *)p == XFS_AGI_MAGIC) {
agi = (xfs_agi_t *)p;
printf(" AGI Buffer: (XAGI)\n");
if (!print_buffer) continue;
printf(" ver:%d ", agi->agi_versionnum);
printf("seq#:%d len:%d cnt:%d root:%d\n",
agi->agi_seqno, agi->agi_length,
agi->agi_count, agi->agi_root);
printf(" level:%d free#:0x%x newino:0x%x\n",
agi->agi_level, agi->agi_freecount,
agi->agi_newino);
} else if (*(uint *)p == XFS_AGF_MAGIC) {
agf = (xfs_agf_t *)p;
printf(" AGF Buffer: (XAGF)\n");
if (!print_buffer) continue;
printf(" ver:%d seq#:%d len:%d \n",
agf->agf_versionnum, agf->agf_seqno,
agf->agf_length);
printf(" root BNO:%d CNT:%d\n",
agf->agf_roots[XFS_BTNUM_BNOi],
agf->agf_roots[XFS_BTNUM_CNTi]);
printf(" level BNO:%d CNT:%d\n",
agf->agf_roots[XFS_BTNUM_BNOi],
agf->agf_roots[XFS_BTNUM_CNTi]);
printf(" 1st:%d last:%d cnt:%d freeblks:%d longest:%d\n",
agf->agf_flfirst, agf->agf_fllast, agf->agf_flcount,
agf->agf_freeblks, agf->agf_longest);
} else {
printf(" BUF DATA\n");
if (!print_buffer) continue;
xlog_recover_print_data(p, len);
}
}
} /* xlog_recover_print_buffer */
STATIC void
xlog_recover_print_inode_core(xfs_dinode_core_t *di)
{
extern int print_inode;
printf(" CORE inode:\n");
if (!print_inode)
return;
printf(" magic:%c%c mode:0x%x ver:%d format:%d nlink:%d\n",
((char *)&di->di_magic)[0], ((char *)&di->di_magic)[1], di->di_mode,
di->di_version, di->di_format, di->di_nlink);
printf(" uid:%d gid:%d uuid:0x%llx\n",
di->di_uid, di->di_gid, di->di_uuid);
printf(" atime:%d mtime:%d ctime:%d\n",
di->di_atime.t_sec, di->di_mtime.t_sec, di->di_ctime.t_sec);
printf(" size:0x%llx nblks:0x%llx exsize:%d nextents:%d nattrext:%d\n",
di->di_size, di->di_nblocks, di->di_extsize, di->di_nextents,
(int)di->di_nattrextents);
printf(" forkoff:%d dmevmask:0x%x dmstate:%d flags:0x%x gen:%d\n",
(int)di->di_forkoff, di->di_dmevmask, (int)di->di_dmstate, (int)di->di_flags,
di->di_gen);
} /* xlog_recover_print_inode_core */
STATIC void
xlog_recover_print_inode(xlog_recover_item_t *item)
{
xfs_inode_log_format_t *f;
xfs_dinode_core_t *dino;
caddr_t p;
int len;
extern int print_inode, print_data;
f = (xfs_inode_log_format_t *)item->ri_buf[0].i_addr;
ASSERT(item->ri_buf[0].i_len == sizeof(xfs_inode_log_format_t));
printf(" INODE: #regs:%d ino:0x%llx flags:0x%x dsize:%d\n",
f->ilf_size, f->ilf_ino, f->ilf_fields, f->ilf_dsize);
/* core inode comes 2nd */
ASSERT(item->ri_buf[1].i_len == sizeof(xfs_dinode_core_t));
xlog_recover_print_inode_core((xfs_dinode_core_t *)item->ri_buf[1].i_addr);
/* does anything come next */
switch (f->ilf_fields & XFS_ILOG_NONCORE) {
case XFS_ILOG_EXT: {
ASSERT(f->ilf_size == 3);
printf(" EXTENTS inode data:\n");
if (print_inode && print_data) {
xlog_recover_print_data(item->ri_buf[2].i_addr,
item->ri_buf[2].i_len);
}
break;
}
case XFS_ILOG_BROOT: {
ASSERT(f->ilf_size == 3);
printf(" BTREE inode data:\n");
if (print_inode && print_data) {
xlog_recover_print_data(item->ri_buf[2].i_addr,
item->ri_buf[2].i_len);
}
break;
}
case XFS_ILOG_DATA: {
ASSERT(f->ilf_size == 3);
printf(" LOCAL inode data:\n");
if (print_inode && print_data) {
xlog_recover_print_data(item->ri_buf[2].i_addr,
item->ri_buf[2].i_len);
}
break;
}
case XFS_ILOG_DEV: {
ASSERT(f->ilf_size == 2);
printf(" DEV inode: no extra region\n");
break;
}
case XFS_ILOG_UUID: {
ASSERT(f->ilf_size == 2);
printf(" UUID inode: no extra region\n");
break;
}
case 0: {
ASSERT(f->ilf_size == 2);
break;
}
default: {
xlog_panic("xlog_print_trans_inode: illegal inode type");
}
}
} /* xlog_recover_print_inode */
STATIC void
xlog_recover_print_efd(xlog_recover_item_t *item)
{
xfs_efd_log_format_t *f;
xfs_extent_t *ex;
int i;
f = (xfs_efd_log_format_t *)item->ri_buf[0].i_addr;
ASSERT(item->ri_buf[0].i_len == sizeof(xfs_efd_log_format_t));
printf(" EFD: #regs: %d num_extents: %d id: 0x%llx\n",
f->efd_size, f->efd_nextents, f->efd_efi_id);
ex = f->efd_extents;
printf(" ");
for (i=0; i< f->efd_size; i++) {
printf("(s: 0x%llx, l: %d) ", ex->ext_start, ex->ext_len);
if (i % 4 == 3) printf("\n");
ex++;
}
if (i % 4 != 0) printf("\n");
return;
} /* xlog_recover_print_efd */
STATIC void
xlog_recover_print_efi(xlog_recover_item_t *item)
{
xfs_efi_log_format_t *f;
xfs_extent_t *ex;
int i;
f = (xfs_efi_log_format_t *)item->ri_buf[0].i_addr;
ASSERT(item->ri_buf[0].i_len == sizeof(xfs_efi_log_format_t));
printf(" EFI: #regs:%d num_extents:%d id:0x%llx\n",
f->efi_size, f->efi_nextents, f->efi_id);
ex = f->efi_extents;
printf(" ");
for (i=0; i< f->efi_size; i++) {
printf("(s: 0x%llx, l: %d) ", ex->ext_start, ex->ext_len);
if (i % 4 == 3) printf("\n");
ex++;
}
if (i % 4 != 0) printf("\n");
return;
} /* xlog_recover_print_efi */
#endif
STATIC void
xlog_recover_print_item(xlog_recover_item_t *item)
{
int i;
switch (ITEM_TYPE(item)) {
case XFS_LI_BUF:
case XFS_LI_OBUF: {
printf("BUF");
break;
}
case XFS_LI_OINODE: {
printf("OINO");
break;
}
case XFS_LI_INODE: {
printf("INO");
break;
}
case XFS_LI_EFD: {
printf("EFD");
break;
}
case XFS_LI_EFI: {
printf("EFI");
break;
}
default: {
cmn_err(CE_PANIC, "xlog_recover_print_item: illegal type\n");
break;
}
}
/* type isn't filled in yet
printf("ITEM: type: %d cnt: %d total: %d ",
item->ri_type, item->ri_cnt, item->ri_total);
*/
printf(": cnt:%d total:%d ", item->ri_cnt, item->ri_total);
for (i=0; i<item->ri_cnt; i++) {
printf("a:0x%x len:%d ",
item->ri_buf[i].i_addr, item->ri_buf[i].i_len);
}
printf("\n");
#ifdef SIM
switch (ITEM_TYPE(item)) {
case XFS_LI_BUF:
case XFS_LI_OBUF: {
xlog_recover_print_buffer(item);
break;
}
case XFS_LI_INODE:
case XFS_LI_OINODE: {
xlog_recover_print_inode(item);
break;
}
case XFS_LI_EFD: {
xlog_recover_print_efd(item);
break;
}
case XFS_LI_EFI: {
xlog_recover_print_efi(item);
break;
}
default: {
printf("xlog_recover_print_item: illegal type\n");
break;
}
}
#endif
} /* xlog_recover_print_item */
/*ARGSUSED*/
STATIC void
xlog_recover_print_trans(xlog_recover_t *trans,
xlog_recover_item_t *itemq,
int print)
{
xlog_recover_item_t *first_item, *item;
if (print < 3)
return;
printf("======================================\n");
#ifdef SIM
xlog_recover_print_trans_head(trans);
#endif
item = first_item = itemq;
do {
xlog_recover_print_item(item);
item = item->ri_next;
} while (first_item != item);
} /* xlog_recover_print_trans */
STATIC void
xlog_recover_insert_item_backq(xlog_recover_item_t **q,
xlog_recover_item_t *item)
{
if (*q == 0) {
item->ri_prev = item->ri_next = item;
*q = item;
} else {
item->ri_next = *q;
item->ri_prev = (*q)->ri_prev;
(*q)->ri_prev = item;
item->ri_prev->ri_next = item;
}
} /* xlog_recover_insert_item_backq */
STATIC void
xlog_recover_insert_item_frontq(xlog_recover_item_t **q,
xlog_recover_item_t *item)
{
xlog_recover_insert_item_backq(q, item);
*q = item;
} /* xlog_recover_insert_item_frontq */
/*ARGSUSED*/
STATIC int
xlog_recover_reorder_trans(xlog_t *log,
xlog_recover_t *trans)
{
xlog_recover_item_t *first_item, *itemq, *itemq_next;
first_item = itemq = trans->r_itemq;
trans->r_itemq = NULL;
do {
itemq_next = itemq->ri_next;
switch (ITEM_TYPE(itemq)) {
case XFS_LI_BUF:
case XFS_LI_OBUF: {
xlog_recover_insert_item_frontq(&trans->r_itemq, itemq);
break;
}
case XFS_LI_INODE:
case XFS_LI_OINODE:
case XFS_LI_EFD:
case XFS_LI_EFI: {
xlog_recover_insert_item_backq(&trans->r_itemq, itemq);
break;
}
default: {
xlog_warn(
"xFS: xlog_recover_reorder_trans: unrecognized type of log operation");
ASSERT(0);
return XFS_ERROR(EIO);
}
}
itemq = itemq_next;
} while (first_item != itemq);
return 0;
} /* xlog_recover_reorder_trans */
/*
* Build up the table of buf cancel records so that we don't replay
* cancelled data in the second pass. For buffer records that are
* not cancel records, there is nothing to do here so we just return.
*
* If we get a cancel record which is already in the table, this indicates
* that the buffer was cancelled multiple times. In order to ensure
* that during pass 2 we keep the record in the table until we reach its
* last occurrence in the log, we keep a reference count in the cancel
* record in the table to tell us how many times we expect to see this
* record during the second pass.
*/
STATIC void
xlog_recover_do_buffer_pass1(xlog_t *log,
xfs_buf_log_format_t *buf_f)
{
xfs_buf_cancel_t *bcp;
xfs_buf_cancel_t *nextp;
xfs_buf_cancel_t *prevp;
xfs_buf_cancel_t **bucket;
daddr_t blkno;
uint len;
/*
* If this isn't a cancel buffer item, then just return.
*/
if (!(buf_f->blf_flags & XFS_BLI_CANCEL)) {
return;
}
/*
* Insert an xfs_buf_cancel record into the hash table of
* them. If there is already an identical record, bump
* its reference count.
*/
blkno = buf_f->blf_blkno;
len = buf_f->blf_len;
bucket = &(log->l_buf_cancel_table[blkno % XLOG_BC_TABLE_SIZE]);
/*
* If the hash bucket is empty then just insert a new record into
* the bucket.
*/
if (*bucket == NULL) {
bcp = (xfs_buf_cancel_t*)kmem_alloc(sizeof(xfs_buf_cancel_t),
KM_SLEEP);
bcp->bc_blkno = blkno;
bcp->bc_len = len;
bcp->bc_refcount = 1;
bcp->bc_next = NULL;
*bucket = bcp;
return;
}
/*
* The hash bucket is not empty, so search for duplicates of our
* record. If we find one them just bump its refcount. If not
* then add us at the end of the list.
*/
prevp = NULL;
nextp = *bucket;
while (nextp != NULL) {
if (nextp->bc_blkno == blkno) {
ASSERT(nextp->bc_len == len);
nextp->bc_refcount++;
return;
}
prevp = nextp;
nextp = nextp->bc_next;
}
ASSERT(prevp != NULL);
bcp = (xfs_buf_cancel_t*)kmem_alloc(sizeof(xfs_buf_cancel_t),
KM_SLEEP);
bcp->bc_blkno = blkno;
bcp->bc_len = len;
bcp->bc_refcount = 1;
bcp->bc_next = NULL;
prevp->bc_next = bcp;
return;
}
/*
* Check to see whether the buffer being recovered has a corresponding
* entry in the buffer cancel record table. If it does then return 1
* so that it will be cancelled, otherwise return 0. If the buffer is
* actually a buffer cancel item (XFS_BLI_CANCEL is set), then decrement
* the refcount on the entry in the table and remove it from the table
* if this is the last reference.
*
* We remove the cancel record from the table when we encounter its
* last occurrence in the log so that if the same buffer is re-used
* again after its last cancellation we actually replay the changes
* made at that point.
*/
STATIC int
xlog_recover_do_buffer_pass2(xlog_t *log,
xfs_buf_log_format_t *buf_f)
{
xfs_buf_cancel_t *bcp;
xfs_buf_cancel_t *prevp;
xfs_buf_cancel_t **bucket;
daddr_t blkno;
if (log->l_buf_cancel_table == NULL) {
/*
* There is nothing in the table built in pass one,
* so this buffer must not be cancelled.
*/
ASSERT(!(buf_f->blf_flags & XFS_BLI_CANCEL));
return 0;
}
bucket = &(log->l_buf_cancel_table[buf_f->blf_blkno %
XLOG_BC_TABLE_SIZE]);
bcp = *bucket;
if (bcp == NULL) {
/*
* There is no corresponding entry in the table built
* in pass one, so this buffer has not been cancelled.
*/
ASSERT(!(buf_f->blf_flags & XFS_BLI_CANCEL));
return 0;
}
/*
* Search for an entry in the buffer cancel table that
* matches our buffer.
*/
blkno = buf_f->blf_blkno;
prevp = NULL;
while (bcp != NULL) {
if (bcp->bc_blkno == blkno) {
/*
* We've go a match, so return 1 so that the
* recovery of this buffer is cancelled.
* If this buffer is actually a buffer cancel
* log item, then decrement the refcount on the
* one in the table and remove it if this is the
* last reference.
*/
ASSERT(bcp->bc_len == buf_f->blf_len);
if (buf_f->blf_flags & XFS_BLI_CANCEL) {
bcp->bc_refcount--;
if (bcp->bc_refcount == 0) {
if (prevp == NULL) {
*bucket = bcp->bc_next;
} else {
prevp->bc_next = bcp->bc_next;
}
kmem_free(bcp,
sizeof(xfs_buf_cancel_t));
}
}
return 1;
}
prevp = bcp;
bcp = bcp->bc_next;
}
/*
* We didn't find a corresponding entry in the table, so
* return 0 so that the buffer is NOT cancelled.
*/
ASSERT(!(buf_f->blf_flags & XFS_BLI_CANCEL));
return 0;
}
/*
* Perform recovery for a buffer full of inodes. In these buffers,
* the only data which should be recovered is that which corresponds
* to the di_next_unlinked pointers in the on disk inode structures.
* The rest of the data for the inodes is always logged through the
* inodes themselves rather than the inode buffer and is recovered
* in xlog_recover_do_inode_trans().
*
* The only time when buffers full of inodes are fully recovered is
* when the buffer is full of newly allocated inodes. In this case
* the buffer will not be marked as an inode buffer and so will be
* sent to xlog_recover_do_reg_buffer() below during recovery.
*/
STATIC void
xlog_recover_do_inode_buffer(xfs_mount_t *mp,
xlog_recover_item_t *item,
buf_t *bp,
xfs_buf_log_format_t *buf_f)
{
int i;
int item_index;
int bit;
int nbits;
int reg_buf_offset;
int reg_buf_bytes;
int next_unlinked_offset;
int inodes_per_buf;
xfs_agino_t *logged_nextp;
xfs_agino_t *buffer_nextp;
/*
* Set the variables corresponding to the current region to
* 0 so that we'll initialize them on the first pass through
* the loop.
*/
reg_buf_offset = 0;
reg_buf_bytes = 0;
bit = 0;
nbits = 0;
item_index = 0;
inodes_per_buf = bp->b_bcount >> mp->m_sb.sb_inodelog;
for (i = 0; i < inodes_per_buf; i++) {
next_unlinked_offset = (i * mp->m_sb.sb_inodesize) +
offsetof(xfs_dinode_t, di_next_unlinked);
while (next_unlinked_offset >=
(reg_buf_offset + reg_buf_bytes)) {
/*
* The next di_next_unlinked field is beyond
* the current logged region. Find the next
* logged region that contains or is beyond
* the current di_next_unlinked field.
*/
bit += nbits;
bit = xfs_buf_item_next_bit(buf_f->blf_data_map,
buf_f->blf_map_size,
bit);
/*
* If there are no more logged regions in the
* buffer, then we're done.
*/
if (bit == -1) {
return;
}
nbits = xfs_buf_item_contig_bits(buf_f->blf_data_map,
buf_f->blf_map_size,
bit);
reg_buf_offset = bit << XFS_BLI_SHIFT;
reg_buf_bytes = nbits << XFS_BLI_SHIFT;
item_index++;
}
/*
* If the current logged region starts after the current
* di_next_unlinked field, then move on to the next
* di_next_unlinked field.
*/
if (next_unlinked_offset < reg_buf_offset) {
continue;
}
ASSERT(item->ri_buf[item_index].i_addr != NULL);
ASSERT((item->ri_buf[item_index].i_len % XFS_BLI_CHUNK) == 0);
ASSERT((reg_buf_offset + reg_buf_bytes) <= bp->b_bcount);
/*
* The current logged region contains a copy of the
* current di_next_unlinked field. Extract its value
* and copy it to the buffer copy.
*/
logged_nextp = (xfs_agino_t *)
((char *)(item->ri_buf[item_index].i_addr) +
(next_unlinked_offset - reg_buf_offset));
buffer_nextp = (xfs_agino_t *)((char *)(bp->b_un.b_addr) +
next_unlinked_offset);
*buffer_nextp = *logged_nextp;
}
} /* xlog_recover_do_inode_buffer */
/*
* Perform a 'normal' buffer recovery. Each logged region of the
* buffer should be copied over the corresponding region in the
* given buffer. The bitmap in the buf log format structure indicates
* where to place the logged data.
*/
/*ARGSUSED*/
STATIC void
xlog_recover_do_reg_buffer(xfs_mount_t *mp,
xlog_recover_item_t *item,
buf_t *bp,
xfs_buf_log_format_t *buf_f)
{
int i;
int bit;
int nbits;
bit = 0;
i = 1; /* 0 is the buf format structure */
while (1) {
bit = xfs_buf_item_next_bit(buf_f->blf_data_map,
buf_f->blf_map_size,
bit);
if (bit == -1)
break;
nbits = xfs_buf_item_contig_bits(buf_f->blf_data_map,
buf_f->blf_map_size,
bit);
ASSERT(item->ri_buf[i].i_addr != 0);
ASSERT(item->ri_buf[i].i_len % XFS_BLI_CHUNK == 0);
ASSERT(bp->b_bcount >=
((uint)bit << XFS_BLI_SHIFT)+(nbits<<XFS_BLI_SHIFT));
bcopy(item->ri_buf[i].i_addr, /* source */
bp->b_un.b_addr+((uint)bit << XFS_BLI_SHIFT), /* dest */
nbits<<XFS_BLI_SHIFT); /* length */
i++;
bit += nbits;
}
/* Shouldn't be any more regions */
if (i < XLOG_MAX_REGIONS_IN_ITEM) {
ASSERT(item->ri_buf[i].i_addr == 0);
ASSERT(item->ri_buf[i].i_len == 0);
}
} /* xlog_recover_do_reg_buffer */
/*
* This routine replays a modification made to a buffer at runtime.
* There are actually two types of buffer, regular and inode, which
* are handled differently. Inode buffers are handled differently
* in that we only recover a specific set of data from them, namely
* the inode di_next_unlinked fields. This is because all other inode
* data is actually logged via inode records and any data we replay
* here which overlaps that may be stale.
*
* When meta-data buffers are freed at run time we log a buffer item
* with the XFS_BLI_CANCEL bit set to indicate that previous copies
* of the buffer in the log should not be replayed at recovery time.
* This is so that if the blocks covered by the buffer are reused for
* file data before we crash we don't end up replaying old, freed
* meta-data into a user's file.
*
* To handle the cancellation of buffer log items, we make two passes
* over the log during recovery. During the first we build a table of
* those buffers which have been cancelled, and during the second we
* only replay those buffers which do not have corresponding cancel
* records in the table. See xlog_recover_do_buffer_pass[1,2] above
* for more details on the implementation of the table of cancel records.
*/
STATIC int
xlog_recover_do_buffer_trans(xlog_t *log,
xlog_recover_item_t *item,
int pass)
{
xfs_buf_log_format_t *buf_f;
xfs_mount_t *mp;
buf_t *bp;
int error;
int cancel;
buf_f = (xfs_buf_log_format_t *)item->ri_buf[0].i_addr;
if (pass == XLOG_RECOVER_PASS1) {
/*
* In this pass we're only looking for buf items
* with the XFS_BLI_CANCEL bit set.
*/
xlog_recover_do_buffer_pass1(log, buf_f);
return 0;
} else {
/*
* In this pass we want to recover all the buffers
* which have not been cancelled and are not
* cancellation buffers themselves. The routine
* we call here will tell us whether or not to
* continue with the replay of this buffer.
*/
cancel = xlog_recover_do_buffer_pass2(log, buf_f);
if (cancel) {
return 0;
}
}
mp = log->l_mp;
bp = bread(mp->m_dev, buf_f->blf_blkno, buf_f->blf_len);
if (bp->b_flags & B_ERROR) {
cmn_err(CE_WARN,
"xFS: xlog_recover_do_buffer_trans: bread error (%d)",
buf_f->blf_blkno);
ASSERT(0);
error = bp->b_error;
brelse(bp);
return error;
}
if (buf_f->blf_flags & XFS_BLI_INODE_BUF) {
xlog_recover_do_inode_buffer(mp, item, bp, buf_f);
} else {
xlog_recover_do_reg_buffer(mp, item, bp, buf_f);
}
/*
* Perform delayed write on the buffer. Asynchronous writes will be
* slower when taking into account all the buffers to be flushed.
* If it is an old, unclustered inode buffer, then make sure to
* keep it out of the buffer cache so that it doesn't overlap with
* future reads of those inodes.
*/
if ((log->l_mp->m_sb.sb_blocksize < XFS_INODE_CLUSTER_SIZE) &&
(bp->b_bcount < XFS_INODE_CLUSTER_SIZE) &&
(*((__uint16_t *)(bp->b_un.b_addr)) == XFS_DINODE_MAGIC)) {
bp->b_flags |= B_STALE;
bwrite(bp);
} else {
bdwrite(bp);
}
/*
* Once bdwrite() is called, we lose track of the buffer. Therefore,
* if we want to keep track of buffer errors, we need to add a
* release function which sets some variable which gets looked at
* after calling bflush() on the device. XXXmiken
*/
return 0;
} /* xlog_recover_do_buffer_trans */
STATIC int
xlog_recover_do_inode_trans(xlog_t *log,
xlog_recover_item_t *item,
int pass)
{
xfs_inode_log_format_t *in_f;
xfs_mount_t *mp;
buf_t *bp;
xfs_imap_t imap;
xfs_dinode_t *dip;
int len;
caddr_t src;
int error;
if (pass == XLOG_RECOVER_PASS1) {
return 0;
}
in_f = (xfs_inode_log_format_t *)item->ri_buf[0].i_addr;
mp = log->l_mp;
if (ITEM_TYPE(item) == XFS_LI_INODE) {
imap.im_blkno = (daddr_t)in_f->ilf_blkno;
imap.im_len = in_f->ilf_len;
imap.im_boffset = in_f->ilf_boffset;
} else {
/*
* It's an old inode format record. We don't know where
* its cluster is located on disk, and we can't allow
* xfs_imap() to figure it out because the inode btrees
* are not ready to be used. Therefore do not pass the
* XFS_IMAP_LOOKUP flag to xfs_imap(). This will give
* us only the single block in which the inode lives
* rather than its cluster, so we must make sure to
* invalidate the buffer when we write it out below.
*/
xfs_imap(log->l_mp, 0, in_f->ilf_ino, &imap, 0);
}
bp = bread(mp->m_dev, imap.im_blkno, imap.im_len);
if (bp->b_flags & B_ERROR) {
cmn_err(CE_WARN,
"xFS: xlog_recover_do_inode_trans: bread error (%d)",
bp->b_blkno);
ASSERT(0);
error = bp->b_error;
brelse(bp);
return error;
}
xfs_inobp_check(mp, bp);
ASSERT(in_f->ilf_fields & XFS_ILOG_CORE);
dip = (xfs_dinode_t *)(bp->b_un.b_addr+imap.im_boffset);
ASSERT((caddr_t)dip+item->ri_buf[1].i_len <= bp->b_dmaaddr+bp->b_bcount);
bcopy(item->ri_buf[1].i_addr, dip, item->ri_buf[1].i_len);
if (in_f->ilf_size == 2)
goto write_inode_buffer;
len = item->ri_buf[2].i_len;
src = item->ri_buf[2].i_addr;
ASSERT(in_f->ilf_size == 3);
switch (in_f->ilf_fields & XFS_ILOG_NONCORE) {
case XFS_ILOG_DATA:
case XFS_ILOG_EXT: {
ASSERT((caddr_t)&dip->di_u+len <= bp->b_dmaaddr+bp->b_bcount);
bcopy(src, &dip->di_u, len);
break;
}
case XFS_ILOG_BROOT: {
xfs_bmbt_to_bmdr((xfs_bmbt_block_t *)src, len,
&(dip->di_u.di_bmbt),
XFS_BMAP_BROOT_SIZE(mp->m_sb.sb_inodesize));
break;
}
case XFS_ILOG_DEV: {
dip->di_u.di_dev = in_f->ilf_u.ilfu_rdev;
break;
}
case XFS_ILOG_UUID: {
dip->di_u.di_muuid = in_f->ilf_u.ilfu_uuid;
break;
}
default: {
xlog_warn("xFS: xlog_recover_do_inode_trans: Illegal flag");
ASSERT(0);
brelse(bp);
return XFS_ERROR(EIO);
}
}
write_inode_buffer:
xfs_inobp_check(mp, bp);
if (ITEM_TYPE(item) == XFS_LI_INODE) {
bdwrite(bp);
} else {
bp->b_flags |= B_STALE;
bwrite(bp);
}
/*
* Once bdwrite() is called, we lose track of the buffer. Therefore,
* if we want to keep track of buffer errors, we need to add a
* release function which sets some variable which gets looked at
* after calling bflush() on the device. XXXmiken
*/
return 0;
} /* xlog_recover_do_inode_trans */
/*
* This routine is called to create an in-core extent free intent
* item from the efi format structure which was logged on disk.
* It allocates an in-core efi, copies the extents from the format
* structure into it, and adds the efi to the AIL with the given
* LSN.
*/
STATIC void
xlog_recover_do_efi_trans(xlog_t *log,
xlog_recover_item_t *item,
xfs_lsn_t lsn,
int pass)
{
xfs_mount_t *mp;
xfs_efi_log_item_t *efip;
xfs_efi_log_format_t *efi_formatp;
int spl;
if (pass == XLOG_RECOVER_PASS1) {
return;
}
efi_formatp = (xfs_efi_log_format_t *)item->ri_buf[0].i_addr;
ASSERT(item->ri_buf[0].i_len ==
(sizeof(xfs_efi_log_format_t) +
((efi_formatp->efi_nextents - 1) * sizeof(xfs_extent_t))));
mp = log->l_mp;
efip = xfs_efi_init(mp, efi_formatp->efi_nextents);
bcopy((char *)efi_formatp, (char *)&(efip->efi_format),
sizeof(xfs_efi_log_format_t) +
((efi_formatp->efi_nextents - 1) * sizeof(xfs_extent_t)));
efip->efi_next_extent = efi_formatp->efi_nextents;
spl = AIL_LOCK(mp);
/*
* xfs_trans_update_ail() drops the AIL lock.
*/
xfs_trans_update_ail(mp, (xfs_log_item_t *)efip, lsn, spl);
} /* xlog_recover_do_efi_trans */
/*
* This routine is called when an efd format structure is found in
* a committed transaction in the log. It's purpose is to cancel
* the corresponding efi if it was still in the log. To do this
* it searches the AIL for the efi with an id equal to that in the
* efd format structure. If we find it, we remove the efi from the
* AIL and free it.
*/
STATIC void
xlog_recover_do_efd_trans(xlog_t *log,
xlog_recover_item_t *item,
int pass)
{
xfs_mount_t *mp;
xfs_efd_log_format_t *efd_formatp;
xfs_efi_log_item_t *efip;
xfs_log_item_t *lip;
int spl;
int gen;
int nexts;
__uint64_t efi_id;
if (pass == XLOG_RECOVER_PASS1) {
return;
}
efd_formatp = (xfs_efd_log_format_t *)item->ri_buf[0].i_addr;
ASSERT(item->ri_buf[0].i_len ==
(sizeof(xfs_efd_log_format_t) +
((efd_formatp->efd_nextents - 1) * sizeof(xfs_extent_t))));
efi_id = efd_formatp->efd_efi_id;
/*
* Search for the efi with the id in the efd format structure
* in the AIL.
*/
mp = log->l_mp;
spl = AIL_LOCK(mp);
lip = xfs_trans_first_ail(mp, &gen);
while (lip != NULL) {
if (lip->li_type == XFS_LI_EFI) {
efip = (xfs_efi_log_item_t *)lip;
if (efip->efi_format.efi_id == efi_id) {
/*
* xfs_trans_delete_ail() drops the
* AIL lock.
*/
xfs_trans_delete_ail(mp, lip, spl);
break;
}
}
lip = xfs_trans_next_ail(mp, lip, &gen, NULL);
}
if (lip == NULL) {
AIL_UNLOCK(mp, spl);
}
/*
* If we found it, then free it up. If it wasn't there, it
* must have been overwritten in the log. Oh well.
*/
if (lip != NULL) {
nexts = efip->efi_format.efi_nextents;
if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
kmem_free(lip, sizeof(xfs_efi_log_item_t) +
((nexts - 1) * sizeof(xfs_extent_t)));
} else {
kmem_zone_free(xfs_efi_zone, efip);
}
}
} /* xlog_recover_do_efd_trans */
/*
* Perform the transaction
*
* If the transaction modifies a buffer or inode, do it now. Otherwise,
* EFIs and EFDs get queued up by adding entries into the AIL for them.
*/
STATIC int
xlog_recover_do_trans(xlog_t *log,
xlog_recover_t *trans,
int pass)
{
xlog_recover_item_t *item, *first_item;
int error = 0;
xlog_recover_print_trans(trans, trans->r_itemq, xlog_debug);
#ifdef _KERNEL
if (error = xlog_recover_reorder_trans(log, trans))
return error;
xlog_recover_print_trans(trans, trans->r_itemq, xlog_debug+1);
first_item = item = trans->r_itemq;
do {
if ((ITEM_TYPE(item) == XFS_LI_BUF) ||
(ITEM_TYPE(item) == XFS_LI_OBUF)) {
if (error = xlog_recover_do_buffer_trans(log, item,
pass))
break;
} else if ((ITEM_TYPE(item) == XFS_LI_INODE) ||
(ITEM_TYPE(item) == XFS_LI_OINODE)) {
if (error = xlog_recover_do_inode_trans(log, item,
pass))
break;
} else if (ITEM_TYPE(item) == XFS_LI_EFI) {
xlog_recover_do_efi_trans(log, item, trans->r_lsn,
pass);
} else if (ITEM_TYPE(item) == XFS_LI_EFD) {
xlog_recover_do_efd_trans(log, item, pass);
} else {
xlog_warn("xFS: xlog_recover_do_trans");
ASSERT(0);
error = XFS_ERROR(EIO);
break;
}
item = item->ri_next;
} while (first_item != item);
#endif /* _KERNEL */
return error;
} /* xlog_recover_do_trans */
/*
* Free up any resources allocated by the transaction
*
* Remember that EFIs, EFDs, and IUNLINKs are handled later.
*/
STATIC void
xlog_recover_free_trans(xlog_recover_t *trans)
{
xlog_recover_item_t *first_item, *item, *free_item;
int i;
item = first_item = trans->r_itemq;
do {
free_item = item;
item = item->ri_next;
/* Free the regions in the item. */
for (i = 0; i < free_item->ri_cnt; i++) {
kmem_free(free_item->ri_buf[i].i_addr,
free_item->ri_buf[i].i_len);
}
/* Free the item itself */
kmem_free(free_item, sizeof(xlog_recover_item_t));
} while (first_item != item);
/* Free the transaction recover structure */
kmem_free(trans, sizeof(xlog_recover_t));
} /* xlog_recover_free_trans */
STATIC int
xlog_recover_commit_trans(xlog_t *log,
xlog_recover_t **q,
xlog_recover_t *trans,
int pass)
{
int error;
if (error = xlog_recover_unlink_tid(q, trans))
return error;
if (error = xlog_recover_do_trans(log, trans, pass))
return error;
xlog_recover_free_trans(trans); /* no error */
return 0;
} /* xlog_recover_commit_trans */
/*ARGSUSED*/
STATIC int
xlog_recover_unmount_trans(xlog_recover_t *trans)
{
/* Do nothing now */
xlog_warn("xFS: xlog_recover_unmount_trans: Unmount LR");
return( 0 );
} /* xlog_recover_unmount_trans */
/*
* There are two valid states of the r_state field. 0 indicates that the
* transaction structure is in a normal state. We have either seen the
* start of the transaction or the last operation we added was not a partial
* operation. If the last operation we added to the transaction was a
* partial operation, we need to mark r_state with XLOG_WAS_CONT_TRANS.
*
* NOTE: skip LRs with 0 data length.
*/
STATIC int
xlog_recover_process_data(xlog_t *log,
xlog_recover_t *rhash[],
xlog_rec_header_t *rhead,
caddr_t dp,
int pass)
{
caddr_t lp = dp+rhead->h_len;
int num_logops = rhead->h_num_logops;
xlog_op_header_t *ohead;
xlog_recover_t *trans;
xlog_tid_t tid;
int error;
unsigned long hash;
uint flags;
while (dp < lp) {
ASSERT(dp + sizeof(xlog_op_header_t) <= lp);
ohead = (xlog_op_header_t *)dp;
dp += sizeof(xlog_op_header_t);
if (ohead->oh_clientid != XFS_TRANSACTION &&
ohead->oh_clientid != XFS_LOG) {
xlog_warn("xFS: xlog_recover_process_data: bad clientid ");
ASSERT(0);
return (XFS_ERROR(EIO));
}
tid = ohead->oh_tid;
hash = XLOG_RHASH(tid);
trans = xlog_recover_find_tid(rhash[hash], tid);
if (trans == NULL) { /* not found; add new tid */
if (ohead->oh_flags & XLOG_START_TRANS)
xlog_recover_new_tid(&rhash[hash], tid, rhead->h_lsn);
} else {
ASSERT(dp+ohead->oh_len <= lp);
flags = ohead->oh_flags & ~XLOG_END_TRANS;
if (flags & XLOG_WAS_CONT_TRANS)
flags &= ~XLOG_CONTINUE_TRANS;
switch (flags) {
case XLOG_COMMIT_TRANS: {
error = xlog_recover_commit_trans(log, &rhash[hash],
trans, pass);
break;
}
case XLOG_UNMOUNT_TRANS: {
error = xlog_recover_unmount_trans(trans);
break;
}
case XLOG_WAS_CONT_TRANS: {
error = xlog_recover_add_to_cont_trans(trans, dp,
ohead->oh_len);
break;
}
case XLOG_START_TRANS : {
xlog_warn("xFS: xlog_recover_process_data: bad transaction");
ASSERT(0);
error = XFS_ERROR(EIO);
break;
}
case 0:
case XLOG_CONTINUE_TRANS: {
error = xlog_recover_add_to_trans(trans, dp,
ohead->oh_len);
break;
}
default: {
xlog_warn("xFS: xlog_recover_process_data: bad flag");
ASSERT(0);
error = XFS_ERROR(EIO);
break;
}
} /* switch */
if (error)
return error;
} /* if */
dp += ohead->oh_len;
num_logops--;
}
return( 0 );
} /* xlog_recover_process_data */
/*
* Process an extent free intent item that was recovered from
* the log. We need to free the extents that it describes.
*/
STATIC void
xlog_recover_process_efi(xfs_mount_t *mp,
xfs_efi_log_item_t *efip)
{
xfs_efd_log_item_t *efdp;
xfs_trans_t *tp;
int i;
xfs_extent_t *extp;
#ifdef SIM
ASSERT(0);
#else
ASSERT(!(efip->efi_flags & XFS_EFI_RECOVERED));
tp = xfs_trans_alloc(mp, 0);
xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, 0, 0);
efdp = xfs_trans_get_efd(tp, efip, efip->efi_format.efi_nextents);
for (i = 0; i < efip->efi_format.efi_nextents; i++) {
extp = &(efip->efi_format.efi_extents[i]);
xfs_free_extent(tp, extp->ext_start, extp->ext_len);
xfs_trans_log_efd_extent(tp, efdp, extp->ext_start,
extp->ext_len);
}
efip->efi_flags |= XFS_EFI_RECOVERED;
xfs_trans_commit(tp, 0);
#endif /* SIM */
} /* xlog_recover_process_efi */
/*
* Verify that once we've encountered something other than an EFI
* in the AIL that there are no more EFIs in the AIL.
*/
#ifdef DEBUG
STATIC void
xlog_recover_check_ail(xfs_mount_t *mp,
xfs_log_item_t *lip,
int gen)
{
int orig_gen;
orig_gen = gen;
do {
ASSERT(lip->li_type != XFS_LI_EFI);
lip = xfs_trans_next_ail(mp, lip, &gen, NULL);
/*
* The check will be bogus if we restart from the
* beginning of the AIL, so ASSERT that we don't.
* We never should since we're holding the AIL lock
* the entire time.
*/
ASSERT(gen == orig_gen);
} while (lip != NULL);
}
#endif /* DEBUG */
/*
* When this is called, all of the EFIs which did not have
* corresponding EFDs should be in the AIL. What we do now
* is free the extents associated with each one.
*
* Since we process the EFIs in normal transactions, they
* will be removed at some point after the commit. This prevents
* us from just walking down the list processing each one.
* We'll use a flag in the EFI to skip those that we've already
* processed and use the AIL iteration mechanism's generation
* count to try to speed this up at least a bit.
*
* When we start, we know that the EFIs are the only things in
* the AIL. As we process them, however, other items are added
* to the AIL. Since everything added to the AIL must come after
* everything already in the AIL, we stop processing as soon as
* we see something other than an EFI in the AIL.
*/
STATIC void
xlog_recover_process_efis(xlog_t *log)
{
xfs_log_item_t *lip;
xfs_efi_log_item_t *efip;
int gen;
xfs_mount_t *mp;
int spl;
mp = log->l_mp;
spl = AIL_LOCK(mp);
lip = xfs_trans_first_ail(mp, &gen);
while (lip != NULL) {
/*
* We're done when we see something other than an EFI.
*/
if (lip->li_type != XFS_LI_EFI) {
xlog_recover_check_ail(mp, lip, gen);
break;
}
/*
* Skip EFIs that we've already processed.
*/
efip = (xfs_efi_log_item_t *)lip;
if (efip->efi_flags & XFS_EFI_RECOVERED) {
lip = xfs_trans_next_ail(mp, lip, &gen, NULL);
continue;
}
AIL_UNLOCK(mp, spl);
xlog_recover_process_efi(mp, efip);
spl = AIL_LOCK(mp);
lip = xfs_trans_next_ail(mp, lip, &gen, NULL);
}
AIL_UNLOCK(mp, spl);
} /* xlog_recover_process_efis */
/*
* xlog_iunlink_recover
*
* This is called during recovery to process any inodes which
* we unlinked but not freed when the system crashed. These
* inodes will be on the lists in the AGI blocks. What we do
* here is scan all the AGIs and fully truncate and free any
* inodes found on the lists. Each inode is removed from the
* lists when it has been fully truncated and is freed. The
* freeing of the inode and its removal from the list must be
* atomic.
*/
STATIC void
xlog_recover_process_iunlinks(xlog_t *log)
{
xfs_mount_t *mp;
xfs_agnumber_t agno;
xfs_agi_t *agi;
daddr_t agidaddr;
buf_t *agibp;
xfs_inode_t *ip;
xfs_agino_t agino;
xfs_ino_t ino;
int bucket;
mp = log->l_mp;
for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
/*
* Find the agi for this ag.
*/
agidaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR);
agibp = read_buf(mp->m_dev, agidaddr, 1, 0);
agi = XFS_BUF_TO_AGI(agibp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
bucket = 0;
while (bucket < XFS_AGI_UNLINKED_BUCKETS) {
/*
* If there is nothing in the current bucket,
* then continue on to the next one.
*/
agino = agi->agi_unlinked[bucket];
if (agino == NULLAGINO) {
bucket++;
continue;
}
/*
* Release the agi buffer so that it can
* be acquired in the normal course of the
* transaction to truncate and free the inode.
*/
brelse(agibp);
ino = XFS_AGINO_TO_INO(mp, agno, agino);
ip = xfs_iget(mp, NULL, ino, 0);
ASSERT(ip != NULL);
ASSERT(ip->i_d.di_nlink == 0);
ASSERT(ip->i_d.di_mode != 0);
ASSERT(ip->i_vnode->v_count == 1);
/*
* Drop our reference to the inode. This
* will send the inode to xfs_inactive()
* which will truncate the file and free
* the inode.
*/
VN_RELE(ip->i_vnode);
/*
* Reacquire the agibuffer and continue around
* the loop.
*/
agidaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR);
agibp = read_buf(mp->m_dev, agidaddr, 1, 0);
agi = XFS_BUF_TO_AGI(agibp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
}
/*
* Release the buffer for the current agi so we can
* go on to the next one.
*/
brelse(agibp);
}
} /* xlog_recover_process_iunlinks */
/*
* Stamp cycle number in every block
*
* This routine is also called in xfs_log.c
*/
/*ARGSUSED*/
void
xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog)
{
int i;
caddr_t dp;
#ifdef DEBUG
uint *up;
uint chksum = 0;
up = (uint *)iclog->ic_data;
/* divide length by 4 to get # words */
for (i=0; i<iclog->ic_offset >> 2; i++) {
chksum ^= *up;
up++;
}
iclog->ic_header.h_chksum = chksum;
#endif /* DEBUG */
dp = iclog->ic_data;
for (i = 0; i<BTOBB(iclog->ic_offset); i++) {
iclog->ic_header.h_cycle_data[i] = *(uint *)dp;
*(uint *)dp = CYCLE_LSN(iclog->ic_header.h_lsn);
dp += BBSIZE;
}
} /* xlog_pack_data */
STATIC void
xlog_unpack_data(xlog_rec_header_t *rhead,
caddr_t dp,
xlog_t *log)
{
int i;
#ifdef DEBUG
uint *up = (uint *)dp;
uint chksum = 0;
#endif
for (i=0; i<BTOBB(rhead->h_len); i++) {
*(uint *)dp = *(uint *)&rhead->h_cycle_data[i];
dp += BBSIZE;
}
#ifdef DEBUG
/* divide length by 4 to get # words */
for (i=0; i < rhead->h_len >> 2; i++) {
chksum ^= *up;
up++;
}
if (chksum != rhead->h_chksum) {
if (rhead->h_chksum != 0 ||
((log->l_flags & XLOG_CHKSUM_MISMATCH) == 0)) {
cmn_err(CE_DEBUG,
"xFS: LogR chksum mismatch: was (0x%x) is (0x%x)\n",
rhead->h_chksum, chksum);
cmn_err(CE_DEBUG,
"xFS: Disregard message if filesystem was created with non-DEBUG kernel\n");
log->l_flags |= XLOG_CHKSUM_MISMATCH;
}
}
#endif /* DEBUG */
} /* xlog_unpack_data */
/*
* Read the log from tail to head and process the log records found.
* Handle the two cases where the tail and head are in the same cycle
* and where the active portion of the log wraps around the end of
* the physical log separately. The pass parameter is passed through
* to the routines called to process the data and is not looked at
* here.
*/
STATIC int
xlog_do_recovery_pass(xlog_t *log,
daddr_t head_blk,
daddr_t tail_blk,
int pass)
{
xlog_rec_header_t *rhead;
daddr_t blk_no;
caddr_t bufaddr;
buf_t *hbp, *dbp;
int error;
int bblks, split_bblks;
xlog_recover_t *rhash[XLOG_RHASH_SIZE];
error = 0;
hbp = xlog_get_bp(1);
dbp = xlog_get_bp(BTOBB(XLOG_MAX_RECORD_BSIZE));
bzero(rhash, sizeof(rhash));
if (tail_blk <= head_blk) {
for (blk_no = tail_blk; blk_no < head_blk; ) {
if (error = xlog_bread(log, blk_no, 1, hbp))
goto bread_err;
rhead = (xlog_rec_header_t *)hbp->b_dmaaddr;
ASSERT(rhead->h_magicno == XLOG_HEADER_MAGIC_NUM);
bblks = BTOBB(rhead->h_len); /* blocks in data section */
if (bblks > 0) {
if (error = xlog_bread(log, blk_no+1, bblks, dbp))
goto bread_err;
xlog_unpack_data(rhead, dbp->b_dmaaddr, log);
if (error = xlog_recover_process_data(log, rhash,
rhead, dbp->b_dmaaddr,
pass))
return error;
}
blk_no += (bblks+1);
}
} else {
/*
* Perform recovery around the end of the physical log. When the head
* is not on the same cycle number as the tail, we can't do a sequential
* recovery as above.
*/
blk_no = tail_blk;
while (blk_no < log->l_logBBsize) {
/* Read header of one block */
if (error = xlog_bread(log, blk_no, 1, hbp))
goto bread_err;
rhead = (xlog_rec_header_t *)hbp->b_dmaaddr;
ASSERT(rhead->h_magicno == XLOG_HEADER_MAGIC_NUM);
bblks = BTOBB(rhead->h_len);
/* LR body must have data or it wouldn't have been written */
ASSERT(bblks > 0);
blk_no++; /* successfully read header */
ASSERT(blk_no <= log->l_logBBsize);
/* Read in data for log record */
if (blk_no+bblks <= log->l_logBBsize) {
if (error = xlog_bread(log, blk_no, bblks, dbp))
goto bread_err;
} else {
/* This log record is split across physical end of log */
split_bblks = 0;
if (blk_no != log->l_logBBsize) {
/* some data is before physical end of log */
split_bblks = log->l_logBBsize - blk_no;
ASSERT(split_bblks > 0);
if (error = xlog_bread(log, blk_no, split_bblks, dbp))
goto bread_err;
}
bufaddr = dbp->b_dmaaddr;
dbp->b_dmaaddr += BBTOB(split_bblks);
if (error = xlog_bread(log, 0, bblks - split_bblks, dbp))
goto bread_err;
dbp->b_dmaaddr = bufaddr;
}
xlog_unpack_data(rhead, dbp->b_dmaaddr, log);
if (error = xlog_recover_process_data(log, rhash,
rhead, dbp->b_dmaaddr,
pass))
goto bread_err;
blk_no += bblks;
}
ASSERT(blk_no >= log->l_logBBsize);
blk_no -= log->l_logBBsize;
/* read first part of physical log */
while (blk_no < head_blk) {
if (error = xlog_bread(log, blk_no, 1, hbp))
goto bread_err;
rhead = (xlog_rec_header_t *)hbp->b_dmaaddr;
ASSERT(rhead->h_magicno == XLOG_HEADER_MAGIC_NUM);
bblks = BTOBB(rhead->h_len);
ASSERT(bblks > 0);
if (error = xlog_bread(log, blk_no+1, bblks, dbp))
goto bread_err;
xlog_unpack_data(rhead, dbp->b_dmaaddr, log);
if (error = xlog_recover_process_data(log, rhash,
rhead, dbp->b_dmaaddr,
pass))
goto bread_err;
blk_no += (bblks+1);
}
}
bread_err:
xlog_put_bp(dbp);
xlog_put_bp(hbp);
return error;
}
/*
* Do the recovery of the log. We actually do this in two phases.
* The two passes are necessary in order to implement the function
* of cancelling a record written into the log. The first pass
* determines those things which have been cancelled, and the
* second pass replays log items normally except for those which
* have been cancelled. The handling of the replay and cancellations
* takes place in the log item type specific routines.
*
* The table of items which have cancel records in the log is allocated
* and freed at this level, since only here do we know when all of
* the log recovery has been completed.
*/
STATIC int
xlog_do_log_recovery(xlog_t *log,
daddr_t head_blk,
daddr_t tail_blk)
{
int error;
int i;
/*
* First do a pass to find all of the cancelled buf log items.
* Store them in the buf_cancel_table for use in the second pass.
*/
log->l_buf_cancel_table =
(xfs_buf_cancel_t **)kmem_zalloc(XLOG_BC_TABLE_SIZE *
sizeof(xfs_buf_cancel_t*),
KM_SLEEP);
error = xlog_do_recovery_pass(log, head_blk, tail_blk,
XLOG_RECOVER_PASS1);
if (error != 0) {
kmem_free(log->l_buf_cancel_table,
XLOG_BC_TABLE_SIZE * sizeof(xfs_buf_cancel_t*));
log->l_buf_cancel_table = NULL;
return error;
}
/*
* Then do a second pass to actually recover the items in the log.
* When it is complete free the table of buf cancel items.
*/
error = xlog_do_recovery_pass(log, head_blk, tail_blk,
XLOG_RECOVER_PASS2);
#ifdef DEBUG
for (i = 0; i < XLOG_BC_TABLE_SIZE; i++) {
ASSERT(log->l_buf_cancel_table[i] == NULL);
}
#endif /* DEBUG */
kmem_free(log->l_buf_cancel_table,
XLOG_BC_TABLE_SIZE * sizeof(xfs_buf_cancel_t*));
log->l_buf_cancel_table = NULL;
return error;
}
/*
* Do the actual recovery
*/
STATIC int
xlog_do_recover(xlog_t *log,
daddr_t head_blk,
daddr_t tail_blk)
{
buf_t *bp;
xfs_sb_t *sbp;
int error;
/*
* First replay the images in the log.
*/
error = xlog_do_log_recovery(log, head_blk, tail_blk);
if (error) {
return error;
}
#ifdef _KERNEL
bflush(log->l_mp->m_dev); /* Flush out the delayed write buffers */
/*
* We now update the tail_lsn since much of the recovery has completed
* and there may be space available to use. If there were no extent
* or iunlinks, we can free up the entire log and set the tail_lsn to
* be the last_sync_lsn. This was set in xlog_find_tail to be the
* lsn of the last known good LR on disk. If there are extent frees
* or iunlinks they will have some entries in the AIL; so we look at
* the AIL to determine how to set the tail_lsn.
*/
xlog_assign_tail_lsn(log->l_mp, 0);
/*
* Now that we've finished replaying all buffer and inode
* updates, re-read in the superblock.
*/
bp = xfs_getsb(log->l_mp, 0);
bp->b_flags &= ~B_DONE;
bp->b_flags |= B_READ;
#ifndef SIM
bp_dcache_wbinval(bp);
#endif
bdstrat(bmajor(bp->b_edev), bp);
if (error = iowait(bp)) {
ASSERT(0);
brelse(bp);
return error;
}
sbp = XFS_BUF_TO_SBP(bp);
ASSERT(sbp->sb_magicnum == XFS_SB_MAGIC);
ASSERT(sbp->sb_versionnum == XFS_SB_VERSION);
log->l_mp->m_sb = *sbp;
brelse(bp);
xlog_recover_check_summary(log);
/* Normal transactions can now occur */
log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
#endif /* _KERNEL */
return 0;
} /* xlog_do_recover */
/*
* Perform recovery and re-initialize some log variables in xlog_find_tail.
*
* Return error or zero.
*/
int
xlog_recover(xlog_t *log)
{
daddr_t head_blk, tail_blk;
int error;
if (error = xlog_find_tail(log, &head_blk, &tail_blk))
return error;
if (tail_blk != head_blk) {
#if defined(DEBUG) && defined(_KERNEL)
cmn_err(CE_NOTE,
"Starting xFS recovery on filesystem: %s (dev: %d/%d)",
log->l_mp->m_fsname, emajor(log->l_dev),
eminor(log->l_dev));
#endif
error = xlog_do_recover(log, head_blk, tail_blk);
log->l_flags |= XLOG_RECOVERY_NEEDED;
}
return error;
} /* xlog_recover */
/*
* In the first part of recovery we replay inodes and buffers and build
* up the list of extent free items which need to be processed. Here
* we process the extent free items and clean up the on disk unlinked
* inode lists. This is separated from the first part of recovery so
* that the root and real-time bitmap inodes can be read in from disk in
* between the two stages. This is necessary so that we can free space
* in the real-time portion of the file system.
*/
int
xlog_recover_finish(xlog_t *log)
{
/*
* Now we're ready to do the transactions needed for the
* rest of recovery. Start with completing all the extent
* free intent records and then process the unlinked inode
* lists. At this point, we essentially run in normal mode
* except that we're still performing recovery actions
* rather than accepting new requests.
*/
if (log->l_flags & XLOG_RECOVERY_NEEDED) {
#ifdef _KERNEL
xlog_recover_process_efis(log);
xlog_recover_process_iunlinks(log);
xlog_recover_check_summary(log);
#endif /* _KERNEL */
cmn_err(CE_NOTE,
"Ending xFS recovery for filesystem: %s (dev: %d/%d)",
log->l_mp->m_fsname, emajor(log->l_dev),
eminor(log->l_dev));
log->l_flags &= ~XLOG_RECOVERY_NEEDED;
} else {
cmn_err(CE_NOTE,
"Ending clean xFS mount for filesystem: %s",
log->l_mp->m_fsname);
}
return 0;
} /* xlog_recover_finish */
#ifdef DEBUG
/*
* Read all of the agf and agi counters and check that they
* are consistent with the superblock counters.
*/
void
xlog_recover_check_summary(xlog_t *log)
{
xfs_mount_t *mp;
xfs_agf_t *agfp;
xfs_agi_t *agip;
buf_t *agfbp;
buf_t *agibp;
daddr_t agfdaddr;
daddr_t agidaddr;
buf_t *sbbp;
xfs_sb_t *sbp;
xfs_agnumber_t agno;
__uint64_t freeblks;
__uint64_t itotal;
__uint64_t ifree;
mp = log->l_mp;
freeblks = 0LL;
itotal = 0LL;
ifree = 0LL;
for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
agfdaddr = XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR);
agfbp = read_buf(mp->m_dev, agfdaddr, 1, 0);
agfp = XFS_BUF_TO_AGF(agfbp);
ASSERT(agfp->agf_magicnum == XFS_AGF_MAGIC);
ASSERT(agfp->agf_versionnum == XFS_AGF_VERSION);
ASSERT(agfp->agf_seqno == agno);
freeblks += agfp->agf_freeblks + agfp->agf_flcount;
brelse(agfbp);
agidaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR);
agibp = read_buf(mp->m_dev, agidaddr, 1, 0);
agip = XFS_BUF_TO_AGI(agibp);
ASSERT(agip->agi_magicnum == XFS_AGI_MAGIC);
ASSERT(agip->agi_versionnum == XFS_AGI_VERSION);
ASSERT(agip->agi_seqno == agno);
itotal += agip->agi_count;
ifree += agip->agi_freecount;
brelse(agibp);
}
sbbp = xfs_getsb(mp, 0);
sbp = XFS_BUF_TO_SBP(sbbp);
cmn_err(CE_WARN, "xlog_recover_check_summary: sb_icount %lld itotal %lld\n", sbp->sb_icount, itotal);
cmn_err(CE_WARN, "xlog_recover_check_summary: sb_ifree %lld itotal %lld\n", sbp->sb_ifree, ifree);
cmn_err(CE_WARN, "xlog_recover_check_summary: sb_fdblocks %lld freeblks %lld\n", sbp->sb_fdblocks, freeblks);
#if 0
/*
* This is turned off until I account for the allocation
* btree blocks which live in free space.
*/
ASSERT(sbp->sb_icount == itotal);
ASSERT(sbp->sb_ifree == ifree);
ASSERT(sbp->sb_fdblocks == freeblks);
#endif
brelse(sbbp);
}
#endif
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