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xfs: unwind the try_again loop in xfs_log_force 

Instead split out a __xfs_log_fore_lsn helper that gets called again
with the already_slept flag set to true in case we had to sleep.

This prepares for aio_fsync support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
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 2018-03-13 23:15:30 -07:00 committed by Darrick J. Wong
parent 93806299b5
commit 3e4da466bf
1 changed files with 42 additions and 30 deletions
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72
fs/xfs/xfs_log.c
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@ -3395,41 +3395,17 @@ out_error:
return -EIO;
}
/*
* Force the in-core log to disk for a specific LSN.
*
* Find in-core log with lsn.
* If it is in the DIRTY state, just return.
* If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
* state and go to sleep or return.
* If it is in any other state, go to sleep or return.
*
* Synchronous forces are implemented with a wait queue. All callers trying
* to force a given lsn to disk must wait on the queue attached to the
* specific in-core log. When given in-core log finally completes its write
* to disk, that thread will wake up all threads waiting on the queue.
*/
int
xfs_log_force_lsn(
static int
__xfs_log_force_lsn(
struct xfs_mount *mp,
xfs_lsn_t lsn,
uint flags,
int *log_flushed)
int *log_flushed,
bool already_slept)
{
struct xlog *log = mp->m_log;
struct xlog_in_core *iclog;
int already_slept = 0;
ASSERT(lsn != 0);
XFS_STATS_INC(mp, xs_log_force);
trace_xfs_log_force(mp, lsn, _RET_IP_);
lsn = xlog_cil_force_lsn(log, lsn);
if (lsn == NULLCOMMITLSN)
return 0;
try_again:
spin_lock(&log->l_icloglock);
iclog = log->l_iclog;
if (iclog->ic_state & XLOG_STATE_IOERROR)
@ -3469,8 +3445,7 @@ try_again:
xlog_wait(&iclog->ic_prev->ic_write_wait,
&log->l_icloglock);
already_slept = 1;
goto try_again;
return -EAGAIN;
}
atomic_inc(&iclog->ic_refcnt);
xlog_state_switch_iclogs(log, iclog, 0);
@ -3503,6 +3478,43 @@ out_error:
return -EIO;
}
/*
* Force the in-core log to disk for a specific LSN.
*
* Find in-core log with lsn.
* If it is in the DIRTY state, just return.
* If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
* state and go to sleep or return.
* If it is in any other state, go to sleep or return.
*
* Synchronous forces are implemented with a wait queue. All callers trying
* to force a given lsn to disk must wait on the queue attached to the
* specific in-core log. When given in-core log finally completes its write
* to disk, that thread will wake up all threads waiting on the queue.
*/
int
xfs_log_force_lsn(
struct xfs_mount *mp,
xfs_lsn_t lsn,
uint flags,
int *log_flushed)
{
int ret;
ASSERT(lsn != 0);
XFS_STATS_INC(mp, xs_log_force);
trace_xfs_log_force(mp, lsn, _RET_IP_);
lsn = xlog_cil_force_lsn(mp->m_log, lsn);
if (lsn == NULLCOMMITLSN)
return 0;
ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, false);
if (ret == -EAGAIN)
ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, true);
return ret;
}
/*
* Called when we want to mark the current iclog as being ready to sync to
* disk.