#ident "$Revision: 1.2 $"
#include <sys/types.h>
#include <sys/param.h>
#ifdef SIM
#define _KERNEL
#endif
#include <sys/sysmacros.h>
#include <sys/buf.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/kmem.h>
#include <sys/debug.h>
#include <sys/sema.h>
#include <sys/uuid.h>
#include <sys/vfs.h>
#include "xfs_inum.h"
#include "xfs_types.h"
#include "xfs_ag.h" /* needed by xfs_sb.h */
#include "xfs_sb.h" /* depends on xfs_types.h & xfs_inum.h */
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_mount.h" /* depends on xfs_trans.h & xfs_sb.h */
#include "xfs_inode_item.h"
#include "xfs_error.h"
#include "xfs_log_priv.h" /* depends on all above */
#include "xfs_buf_item.h"
#include "xfs_log_recover.h"
#ifdef SIM
#include "sim.h" /* must be last include file */
#endif
STATIC int xlog_find_zeroed(xlog_t *log, daddr_t *blk_no);
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.
*/
void
xlog_bread(xlog_t *log,
daddr_t blk_no,
int nbblks,
buf_t *bp)
{
ASSERT(nbblks > 0);
bp->b_blkno = blk_no + log->l_logBBstart;
bp->b_flags = B_READ|B_BUSY;
bp->b_bcount = BBTOB(nbblks);
bp->b_bufsize = bp->b_bcount;
bp->b_edev = log->l_dev;
bdstrat(bmajor(bp->b_edev), bp);
iowait(bp);
if (bp->b_flags & B_ERROR) {
xlog_panic("xlog_bread: bread error");
}
} /* 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 daddr_t
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;
mid_blk = BLK_AVG(first_blk, last_blk);
while (mid_blk != first_blk && mid_blk != last_blk) {
xlog_bread(log, mid_blk, 1, bp);
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 last_blk;
} /* 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.
*/
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;
daddr_t last_blk = start_blk + nbblks;
for (i=0; i<nbblks; i++) {
cycle = GET_CYCLE(*bap);
if (cycle == verify_cycle_no) {
(*bap) += BBSIZE;
} else {
last_blk = start_blk+i;
break;
}
}
return last_blk;
} /* xlog_find_verify_cycle */
static daddr_t
xlog_find_verify_log_record(caddr_t ba, /* update ptr as we go */
daddr_t start_blk,
daddr_t last_blk)
{
xlog_rec_header_t *rhead;
int i;
if (last_blk == start_blk)
xlog_panic("xlog_find_verify_log_record: need to backup");
ba -= BBSIZE;
for (i=last_blk-1; i>=0; i--) {
if (*(uint *)ba == XLOG_HEADER_MAGIC_NUM)
break;
else {
if (i < start_blk)
xlog_panic("xlog_find_verify_log_record: need to backup");
ba -= BBSIZE;
}
}
rhead = (xlog_rec_header_t *)ba;
if (last_blk - i != BTOBB(rhead->h_len)+1)
last_blk = i;
return last_blk;
} /* 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.
*/
daddr_t
xlog_find_head(xlog_t *log)
{
buf_t *bp, *big_bp;
daddr_t first_blk, mid_blk, last_blk, num_scan_bblks;
daddr_t start_blk, saved_last_blk;
uint first_half_cycle, mid_cycle, last_half_cycle, cycle;
caddr_t ba;
int i, log_bbnum = log->l_logBBsize;
/* special case freshly mkfs'ed filesystem */
if (xlog_find_zeroed(log, &first_blk))
return first_blk;
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 */
last_blk = xlog_find_cycle_start(log, bp, first_blk,
last_blk, last_half_cycle);
}
/* Now validate the answer */
num_scan_bblks = BTOBB(XLOG_NUM_ICLOGS<<XLOG_RECORD_BSHIFT);
big_bp = xlog_get_bp(num_scan_bblks);
if (last_blk >= num_scan_bblks) {
start_blk = last_blk - num_scan_bblks;
xlog_bread(log, start_blk, num_scan_bblks, big_bp);
ba = big_bp->b_dmaaddr;
last_blk = xlog_find_verify_cycle(&ba, start_blk,
num_scan_bblks,
first_half_cycle);
} else { /* need to read 2 parts of log */
/* scan end of physical log */
start_blk = log_bbnum - num_scan_bblks + last_blk;
xlog_bread(log, start_blk, num_scan_bblks - last_blk, big_bp);
ba = big_bp->b_dmaaddr;
saved_last_blk = last_blk;
if ((last_blk =
xlog_find_verify_cycle(&ba, start_blk,
num_scan_bblks - last_blk,
last_half_cycle)) != saved_last_blk)
goto bad_blk;
/* scan beginning of physical log */
start_blk = 0;
xlog_bread(log, start_blk, last_blk, big_bp);
ba = big_bp->b_dmaaddr;
last_blk = xlog_find_verify_cycle(&ba, start_blk, last_blk,
first_half_cycle);
}
bad_blk:
/* Potentially backup over partial log record write */
last_blk = xlog_find_verify_log_record(ba, start_blk, last_blk);
xlog_put_bp(big_bp);
xlog_put_bp(bp);
return last_blk;
} /* xlog_find_head */
/*
* 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.
*/
daddr_t
xlog_print_find_oldest(xlog_t *log)
{
buf_t *bp;
daddr_t first_blk, last_blk;
uint first_half_cycle, last_half_cycle;
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 */
last_blk = xlog_find_cycle_start(log, bp, first_blk,
last_blk, last_half_cycle);
}
xlog_put_bp(bp);
return last_blk;
} /* xlog_find_oldest */
/*
* 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 daddr_t
xlog_find_tail(xlog_t *log,
daddr_t *head_blk)
{
xlog_rec_header_t *rhead;
xlog_op_header_t *op_head;
daddr_t tail_blk;
buf_t *bp;
int i, found = 0;
int zeroed_log = 0;
/* find previous log record */
*head_blk = xlog_find_head(log);
bp = xlog_get_bp(1);
if (*head_blk == 0) {
xlog_bread(log, 0, 1, bp);
if (GET_CYCLE(bp->b_dmaaddr) == 0) {
tail_blk = 0;
/* leave all other log inited values alone */
goto exit;
}
}
for (i=(*head_blk)-1; i>=0; i--) {
xlog_bread(log, i, 1, bp);
if (*(uint *)(bp->b_dmaaddr) == XLOG_HEADER_MAGIC_NUM) {
found = 1;
break;
}
}
if (!found) { /* search from end of log */
for (i=log->l_logBBsize-1; i>=(*head_blk); i--) {
xlog_bread(log, i, 1, bp);
if (*(uint *)(bp->b_dmaaddr) == XLOG_HEADER_MAGIC_NUM) {
found = 1;
break;
}
}
}
if (!found)
xlog_panic("xlog_find_tail: counldn't find sync record");
/* find blk_no of tail of log */
rhead = (xlog_rec_header_t *)bp->b_dmaaddr;
tail_blk = BLOCK_LSN(rhead->h_tail_lsn);
log->l_prev_block = i;
log->l_curr_block = *head_blk;
log->l_curr_cycle = rhead->h_cycle;
log->l_tail_lsn = rhead->h_tail_lsn;
log->l_last_sync_lsn = log->l_tail_lsn;
if (*head_blk == i+2 && rhead->h_num_logops == 1) {
xlog_bread(log, i+1, 1, bp);
op_head = (xlog_op_header_t *)bp->b_dmaaddr;
if ((op_head->oh_flags & XLOG_UNMOUNT_TRANS) != 0) {
log->l_tail_lsn =
((long long)log->l_curr_cycle << 32)|((uint)(i+2));
}
}
if (BLOCK_LSN(log->l_tail_lsn) <= *head_blk) {
log->l_logreserved = BBTOB(*head_blk-BLOCK_LSN(log->l_tail_lsn));
} else {
log->l_logreserved =
log->l_logsize - BBTOB(BLOCK_LSN(log->l_tail_lsn)-*head_blk);
}
exit:
xlog_put_bp(bp);
return tail_blk;
} /* 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.
*/
int
xlog_find_zeroed(xlog_t *log,
daddr_t *blk_no)
{
buf_t *bp, *big_bp;
uint first_cycle, mid_cycle, last_cycle, cycle;
daddr_t first_blk, mid_blk, last_blk, start_blk, num_scan_bblks;
caddr_t ba;
int i, log_bbnum = log->l_logBBsize;
/* check totally zeroed log */
bp = xlog_get_bp(1);
xlog_bread(log, 0, 1, bp);
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 */
xlog_bread(log, log_bbnum-1, 1, bp);
last_cycle = GET_CYCLE(bp->b_dmaaddr);
if (last_cycle != 0) { /* log completely written to */
xlog_put_bp(bp);
return 0;
}
ASSERT(first_cycle == 1);
/* we have a partially zeroed log */
last_blk = xlog_find_cycle_start(log, bp, 0, log_bbnum-1, 0);
/* Validate the answer */
num_scan_bblks = BTOBB(XLOG_NUM_ICLOGS<<XLOG_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;
xlog_bread(log, start_blk, num_scan_bblks, big_bp);
ba = big_bp->b_dmaaddr;
last_blk = xlog_find_verify_cycle(&ba, start_blk, num_scan_bblks, 1);
/* Potentially backup over partial log record write */
last_blk = xlog_find_verify_log_record(ba, start_blk, last_blk);
*blk_no = last_blk;
xlog_put_bp(big_bp);
xlog_put_bp(bp);
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_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 **ihead)
{
xlog_recover_item_t *item;
item = kmem_zalloc(sizeof(xlog_recover_item_t),0);
if (*ihead == 0) {
item->ri_prev = item->ri_next = item;
*ihead = item;
} else {
item->ri_next = *ihead;
item->ri_prev = (*ihead)->ri_prev;
(*ihead)->ri_prev = item;
item->ri_prev->ri_next = item;
}
} /* xlog_recover_add_item */
static void
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;
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, 0);
bcopy(&ptr[old_len], dp, len);
item->ri_buf[item->ri_cnt-1].i_len += old_len;
} /* xlog_recover_add_to_cont_trans */
static void
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;
xfs_trans_header_t *thead;
caddr_t ptr;
int total;
ptr = kmem_alloc(len, 0);
bcopy(dp, ptr, len);
in_f = (xfs_inode_log_format_t *)ptr;
item = trans->r_itemq;
if (item == 0) {
xlog_recover_add_item(&trans->r_itemq);
ASSERT(*(uint *)dp == XFS_TRANS_HEADER_MAGIC);
thead = (xfs_trans_header_t *)dp;
trans->r_type = thead->th_type;
trans->r_items = thead->th_num_items;
trans->r_trans_tid = thead->th_tid;
return;
}
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++;
} /* xlog_recover_add_to_trans */
static void
xlog_recover_new_tid(xlog_recover_t **q,
xlog_tid_t tid)
{
xlog_recover_t *trans;
trans = kmem_alloc(sizeof(xlog_recover_t), 0);
trans->r_next = 0;
trans->r_tid = tid;
trans->r_type = 0;
trans->r_state = 0;
trans->r_itemq = 0;
xlog_recover_put_hashq(q, trans);
} /* xlog_recover_new_tid */
static void
xlog_recover_delete_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;
}
}
if (!found)
xlog_panic("xlog_recover_delete_tid: trans not found");
tp->r_next = tp->r_next->r_next;
}
} /* xlog_recover_new_tid */
static void
xlog_recover_print_trans_info(xlog_recover_t *tr)
{
cmn_err(CE_CONT,
"TRANS: tid: 0x%x type: %d #: %d trans: 0x%x q: 0x%x\n",
tr->r_tid, tr->r_type, tr->r_items, tr->r_trans_tid,
tr->r_itemq);
} /* xlog_recover_print_trans_info */
static void
xlog_recover_print_item(xlog_recover_item_t *item)
{
int i;
cmn_err(CE_CONT,
"ITEM: type: %d cnt: %d ttl: %d ",
item->ri_type, item->ri_cnt, item->ri_total);
for (i=0; i<item->ri_cnt; i++) {
cmn_err(CE_CONT, "a: 0x%x len: %d ",
item->ri_buf[i].i_addr, item->ri_buf[i].i_len);
}
cmn_err(CE_CONT, "\n");
} /* xlog_recover_print_item */
static void
xlog_recover_print_trans(xlog_recover_t *trans)
{
xlog_recover_item_t *first_item, *item;
if (xlog_debug < 2)
return;
xlog_recover_print_trans(trans);
item = first_item = trans->r_itemq;
do {
xlog_recover_print_item(item);
item = item->ri_next;
} while (first_item != item);
} /* xlog_recover_print_trans */
static void
xlog_recover_do_trans(xlog_recover_t *trans)
{
xlog_recover_print_trans(trans);
} /* xlog_recover_do_trans */
static void
xlog_recover_free_trans(xlog_recover_t *trans)
{
xlog_recover_item_t *first_item, *item, *free_item;
item = first_item = trans->r_itemq;
do {
free_item = item;
item = item->ri_next;
kmem_free(free_item, sizeof(xlog_recover_item_t));
} while (first_item != item);
kmem_free(trans, sizeof(xlog_recover_t));
} /* xlog_recover_free_trans */
static void
xlog_recover_commit_trans(xlog_recover_t **q,
xlog_recover_t *trans)
{
xlog_recover_delete_tid(q, trans);
xlog_recover_do_trans(trans);
xlog_recover_free_trans(trans);
} /* xlog_recover_commit_trans */
static void
xlog_recover_unmount_trans(xlog_recover_t *trans)
{
} /* 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 void
xlog_recover_process_data(xlog_recover_t *rhash[],
xlog_rec_header_t *rhead,
caddr_t dp)
{
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 hash;
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_panic("xlog_recover_process_data: bad clientid ");
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) != 0)
xlog_recover_new_tid(&rhash[hash], tid);
} else {
ASSERT(dp+ohead->oh_len <= lp);
switch (ohead->oh_flags & ~XLOG_END_TRANS) {
case XLOG_COMMIT_TRANS: {
xlog_recover_commit_trans(&rhash[hash], trans);
break;
}
case XLOG_UNMOUNT_TRANS: {
xlog_recover_unmount_trans(trans);
break;
}
case XLOG_WAS_CONT_TRANS: {
xlog_recover_add_to_cont_trans(trans, dp, ohead->oh_len);
break;
}
case XLOG_START_TRANS : {
xlog_panic("xlog_recover_process_data: bad transaction");
break;
}
case 0:
case XLOG_CONTINUE_TRANS: {
xlog_recover_add_to_trans(trans, dp, ohead->oh_len);
break;
}
default: {
xlog_panic("xlog_recover_process_data: bad flag");
break;
}
}
}
dp += ohead->oh_len;
num_logops--;
}
} /* xlog_recover_process_data */
/*
* Stamp cycle number in every block.
*/
void
xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog)
{
int i;
caddr_t dp;
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)
{
int i;
for (i=0; i<BTOBB(rhead->h_len); i++) {
*(uint *)dp = *(uint *)&rhead->h_cycle_data[i];
dp += BBSIZE;
}
} /* xlog_unpack_data */
/*
* Do the actual recovery.
*/
static int
xlog_do_recover(xlog_t *log,
daddr_t head_blk,
daddr_t tail_blk)
{
xlog_rec_header_t *rhead;
daddr_t blk_no;
buf_t *hbp, *dbp;
int bblks;
xlog_recover_t *rhash[XLOG_RHASH_SIZE];
hbp = xlog_get_bp(1);
dbp = xlog_get_bp(BTOBB(XLOG_RECORD_BSIZE));
bzero(rhash, sizeof(rhash));
if (tail_blk <= head_blk) {
for (blk_no = tail_blk; blk_no < head_blk; ) {
xlog_bread(log, blk_no, 1, hbp);
rhead = (xlog_rec_header_t *)hbp->b_dmaaddr;
ASSERT(rhead->h_magicno == XLOG_HEADER_MAGIC_NUM);
bblks = BTOBB(rhead->h_len);
if (bblks > 0) {
xlog_bread(log, blk_no+1, bblks, dbp);
xlog_unpack_data(rhead, dbp->b_dmaaddr);
xlog_recover_process_data(rhash, rhead,
dbp->b_dmaaddr);
}
blk_no += (bblks+1);
}
} else {
}
} /* xlog_do_recover */
/*
* Perform recovery and re-initialize some log variables in xlog_find_tail.
*/
int
xlog_recover(xlog_t *log)
{
daddr_t head_blk, tail_blk;
tail_blk = xlog_find_tail(log, &head_blk);
if (tail_blk != head_blk) {
xlog_do_recover(log, head_blk, tail_blk);
}
return 0;
}
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