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xfs: factor out iclog size calculation from xlog_sync

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Split out another self-contained bit of code from xlog_sync.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-06-28 19:27:23 -07:00 committed by Darrick J. Wong
parent 5693384805
commit db0a6faf93
1 changed files with 41 additions and 26 deletions
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67
fs/xfs/xfs_log.c
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@ -1791,6 +1791,39 @@ xlog_split_iclog(
return split_offset;
}
static int
xlog_calc_iclog_size(
struct xlog *log,
struct xlog_in_core *iclog,
uint32_t *roundoff)
{
uint32_t count_init, count;
bool use_lsunit;
use_lsunit = xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
log->l_mp->m_sb.sb_logsunit > 1;
/* Add for LR header */
count_init = log->l_iclog_hsize + iclog->ic_offset;
/* Round out the log write size */
if (use_lsunit) {
/* we have a v2 stripe unit to use */
count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
} else {
count = BBTOB(BTOBB(count_init));
}
ASSERT(count >= count_init);
*roundoff = count - count_init;
if (use_lsunit)
ASSERT(*roundoff < log->l_mp->m_sb.sb_logsunit);
else
ASSERT(*roundoff < BBTOB(1));
return count;
}
/*
* Flush out the in-core log (iclog) to the on-disk log in an asynchronous
* fashion. Previously, we should have moved the current iclog
@ -1819,35 +1852,17 @@ xlog_sync(
struct xlog *log,
struct xlog_in_core *iclog)
{
uint count; /* byte count of bwrite */
uint count_init; /* initial count before roundup */
int roundoff; /* roundoff to BB or stripe */
int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb);
uint64_t bno;
unsigned int split = 0;
int size;
bool need_flush = true;
unsigned int count; /* byte count of bwrite */
unsigned int roundoff; /* roundoff to BB or stripe */
uint64_t bno;
unsigned int split = 0;
unsigned int size;
bool need_flush = true;
XFS_STATS_INC(log->l_mp, xs_log_writes);
ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
/* Add for LR header */
count_init = log->l_iclog_hsize + iclog->ic_offset;
/* Round out the log write size */
if (v2 && log->l_mp->m_sb.sb_logsunit > 1) {
/* we have a v2 stripe unit to use */
count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
} else {
count = BBTOB(BTOBB(count_init));
}
roundoff = count - count_init;
ASSERT(roundoff >= 0);
ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 &&
roundoff < log->l_mp->m_sb.sb_logsunit)
||
(log->l_mp->m_sb.sb_logsunit <= 1 &&
roundoff < BBTOB(1)));
count = xlog_calc_iclog_size(log, iclog, &roundoff);
/* move grant heads by roundoff in sync */
xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff);
@ -1858,7 +1873,7 @@ xlog_sync(
/* real byte length */
size = iclog->ic_offset;
if (v2)
if (xfs_sb_version_haslogv2(&log->l_mp->m_sb))
size += roundoff;
iclog->ic_header.h_len = cpu_to_be32(size);