return bio_max_segs(howmany(count, PAGE_SIZE));
}
- static void
- xfs_flush_bdev_async_endio(
- struct bio *bio)
- {
- complete(bio->bi_private);
- }
-
- /*
- * Submit a request for an async cache flush to run. If the request queue does
- * not require flush operations, just skip it altogether. If the caller needs
- * to wait for the flush completion at a later point in time, they must supply a
- * valid completion. This will be signalled when the flush completes. The
- * caller never sees the bio that is issued here.
- */
- void
- xfs_flush_bdev_async(
- struct bio *bio,
- struct block_device *bdev,
- struct completion *done)
- {
- struct request_queue *q = bdev->bd_disk->queue;
-
- if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) {
- complete(done);
- return;
- }
-
- bio_init(bio, bdev, NULL, 0, REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC);
- bio->bi_private = done;
- bio->bi_end_io = xfs_flush_bdev_async_endio;
-
- submit_bio(bio);
- }
int
xfs_rw_bdev(
struct block_device *bdev,
if (is_vmalloc && op == REQ_OP_WRITE)
flush_kernel_vmap_range(data, count);
- bio = bio_alloc(GFP_KERNEL, bio_max_vecs(left));
- bio_set_dev(bio, bdev);
+ bio = bio_alloc(bdev, bio_max_vecs(left), op | REQ_META | REQ_SYNC,
+ GFP_KERNEL);
bio->bi_iter.bi_sector = sector;
- bio->bi_opf = op | REQ_META | REQ_SYNC;
do {
struct page *page = kmem_to_page(data);
while (bio_add_page(bio, page, len, off) != len) {
struct bio *prev = bio;
- bio = bio_alloc(GFP_KERNEL, bio_max_vecs(left));
- bio_copy_dev(bio, prev);
+ bio = bio_alloc(prev->bi_bdev, bio_max_vecs(left),
+ prev->bi_opf, GFP_KERNEL);
bio->bi_iter.bi_sector = bio_end_sector(prev);
- bio->bi_opf = prev->bi_opf;
bio_chain(prev, bio);
submit_bio(prev);
* Run all the pending iclog callbacks and wake log force waiters and iclog
* space waiters so they can process the newly set shutdown state. We really
* don't care what order we process callbacks here because the log is shut down
- * and so state cannot change on disk anymore.
+ * and so state cannot change on disk anymore. However, we cannot wake waiters
+ * until the callbacks have been processed because we may be in unmount and
+ * we must ensure that all AIL operations the callbacks perform have completed
+ * before we tear down the AIL.
*
* We avoid processing actively referenced iclogs so that we don't run callbacks
* while the iclog owner might still be preparing the iclog for IO submssion.
struct xlog_in_core *iclog;
LIST_HEAD(cb_list);
- spin_lock(&log->l_icloglock);
iclog = log->l_iclog;
do {
if (atomic_read(&iclog->ic_refcnt)) {
continue;
}
list_splice_init(&iclog->ic_callbacks, &cb_list);
+ spin_unlock(&log->l_icloglock);
+
+ xlog_cil_process_committed(&cb_list);
+
+ spin_lock(&log->l_icloglock);
wake_up_all(&iclog->ic_write_wait);
wake_up_all(&iclog->ic_force_wait);
} while ((iclog = iclog->ic_next) != log->l_iclog);
wake_up_all(&log->l_flush_wait);
- spin_unlock(&log->l_icloglock);
-
- xlog_cil_process_committed(&cb_list);
}
/*
* Flush iclog to disk if this is the last reference to the given iclog and the
* it is in the WANT_SYNC state.
*
- * If the caller passes in a non-zero @old_tail_lsn and the current log tail
- * does not match, there may be metadata on disk that must be persisted before
- * this iclog is written. To satisfy that requirement, set the
- * XLOG_ICL_NEED_FLUSH flag as a condition for writing this iclog with the new
- * log tail value.
- *
* If XLOG_ICL_NEED_FUA is already set on the iclog, we need to ensure that the
* log tail is updated correctly. NEED_FUA indicates that the iclog will be
* written to stable storage, and implies that a commit record is contained
* always capture the tail lsn on the iclog on the first NEED_FUA release
* regardless of the number of active reference counts on this iclog.
*/
-
int
xlog_state_release_iclog(
struct xlog *log,
- struct xlog_in_core *iclog,
- xfs_lsn_t old_tail_lsn)
+ struct xlog_in_core *iclog)
{
xfs_lsn_t tail_lsn;
bool last_ref;
/*
* Grabbing the current log tail needs to be atomic w.r.t. the writing
* of the tail LSN into the iclog so we guarantee that the log tail does
- * not move between deciding if a cache flush is required and writing
- * the LSN into the iclog below.
+ * not move between the first time we know that the iclog needs to be
+ * made stable and when we eventually submit it.
*/
- if (old_tail_lsn || iclog->ic_state == XLOG_STATE_WANT_SYNC) {
+ if ((iclog->ic_state == XLOG_STATE_WANT_SYNC ||
+ (iclog->ic_flags & XLOG_ICL_NEED_FUA)) &&
+ !iclog->ic_header.h_tail_lsn) {
tail_lsn = xlog_assign_tail_lsn(log->l_mp);
-
- if (old_tail_lsn && tail_lsn != old_tail_lsn)
- iclog->ic_flags |= XLOG_ICL_NEED_FLUSH;
-
- if ((iclog->ic_flags & XLOG_ICL_NEED_FUA) &&
- !iclog->ic_header.h_tail_lsn)
- iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
+ iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
}
last_ref = atomic_dec_and_test(&iclog->ic_refcnt);
* pending iclog callbacks that were waiting on the release of
* this iclog.
*/
- if (last_ref) {
- spin_unlock(&log->l_icloglock);
+ if (last_ref)
xlog_state_shutdown_callbacks(log);
- spin_lock(&log->l_icloglock);
- }
return -EIO;
}
}
iclog->ic_state = XLOG_STATE_SYNCING;
- if (!iclog->ic_header.h_tail_lsn)
- iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
xlog_verify_tail_lsn(log, iclog);
trace_xlog_iclog_syncing(iclog, _RET_IP_);
iclog->ic_flags |= XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA;
if (iclog->ic_state == XLOG_STATE_ACTIVE)
xlog_state_switch_iclogs(iclog->ic_log, iclog, 0);
- return xlog_state_release_iclog(iclog->ic_log, iclog, 0);
+ return xlog_state_release_iclog(iclog->ic_log, iclog);
}
/*
*/
if (XFS_TEST_ERROR(error, log->l_mp, XFS_ERRTAG_IODONE_IOERR)) {
xfs_alert(log->l_mp, "log I/O error %d", error);
- xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR);
+ xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
}
xlog_state_done_syncing(iclog);
return;
}
- bio_init(&iclog->ic_bio, iclog->ic_bvec, howmany(count, PAGE_SIZE));
- bio_set_dev(&iclog->ic_bio, log->l_targ->bt_bdev);
- iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart + bno;
- iclog->ic_bio.bi_end_io = xlog_bio_end_io;
- iclog->ic_bio.bi_private = iclog;
-
/*
* We use REQ_SYNC | REQ_IDLE here to tell the block layer the are more
* IOs coming immediately after this one. This prevents the block layer
* writeback throttle from throttling log writes behind background
* metadata writeback and causing priority inversions.
*/
- iclog->ic_bio.bi_opf = REQ_OP_WRITE | REQ_META | REQ_SYNC | REQ_IDLE;
+ bio_init(&iclog->ic_bio, log->l_targ->bt_bdev, iclog->ic_bvec,
+ howmany(count, PAGE_SIZE),
+ REQ_OP_WRITE | REQ_META | REQ_SYNC | REQ_IDLE);
+ iclog->ic_bio.bi_iter.bi_sector = log->l_logBBstart + bno;
+ iclog->ic_bio.bi_end_io = xlog_bio_end_io;
+ iclog->ic_bio.bi_private = iclog;
+
if (iclog->ic_flags & XLOG_ICL_NEED_FLUSH) {
iclog->ic_bio.bi_opf |= REQ_PREFLUSH;
/*
iclog->ic_flags &= ~(XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA);
if (xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count)) {
- xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR);
+ xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
return;
}
if (is_vmalloc_addr(iclog->ic_data))
ASSERT(iclog->ic_state == XLOG_STATE_WANT_SYNC ||
xlog_is_shutdown(log));
release_iclog:
- error = xlog_state_release_iclog(log, iclog, 0);
+ error = xlog_state_release_iclog(log, iclog);
spin_unlock(&log->l_icloglock);
return error;
}
xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES,
"ctx ticket reservation ran out. Need to up reservation");
xlog_print_tic_res(log->l_mp, ticket);
- xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR);
+ xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR);
}
len = xlog_write_calc_vec_length(ticket, log_vector, optype);
spin_lock(&log->l_icloglock);
xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
- error = xlog_state_release_iclog(log, iclog, 0);
+ error = xlog_state_release_iclog(log, iclog);
spin_unlock(&log->l_icloglock);
return error;
* reference to the iclog.
*/
if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1))
- error = xlog_state_release_iclog(log, iclog, 0);
+ error = xlog_state_release_iclog(log, iclog);
spin_unlock(&log->l_icloglock);
if (error)
return error;
#endif
/*
- * Perform a forced shutdown on the log. This should be called once and once
- * only by the high level filesystem shutdown code to shut the log subsystem
- * down cleanly.
+ * Perform a forced shutdown on the log.
+ *
+ * This can be called from low level log code to trigger a shutdown, or from the
+ * high level mount shutdown code when the mount shuts down.
*
* Our main objectives here are to make sure that:
* a. if the shutdown was not due to a log IO error, flush the logs to
* parties to find out. Nothing new gets queued after this is done.
* c. Tasks sleeping on log reservations, pinned objects and
* other resources get woken up.
+ * d. The mount is also marked as shut down so that log triggered shutdowns
+ * still behave the same as if they called xfs_forced_shutdown().
*
* Return true if the shutdown cause was a log IO error and we actually shut the
* log down.
{
bool log_error = (shutdown_flags & SHUTDOWN_LOG_IO_ERROR);
- /*
- * If this happens during log recovery then we aren't using the runtime
- * log mechanisms yet so there's nothing to shut down.
- */
- if (!log || xlog_in_recovery(log))
+ if (!log)
return false;
- ASSERT(!xlog_is_shutdown(log));
-
/*
* Flush all the completed transactions to disk before marking the log
* being shut down. We need to do this first as shutting down the log
* before the force will prevent the log force from flushing the iclogs
* to disk.
*
- * Re-entry due to a log IO error shutdown during the log force is
- * prevented by the atomicity of higher level shutdown code.
+ * When we are in recovery, there are no transactions to flush, and
+ * we don't want to touch the log because we don't want to perturb the
+ * current head/tail for future recovery attempts. Hence we need to
+ * avoid a log force in this case.
+ *
+ * If we are shutting down due to a log IO error, then we must avoid
+ * trying to write the log as that may just result in more IO errors and
+ * an endless shutdown/force loop.
*/
- if (!log_error)
+ if (!log_error && !xlog_in_recovery(log))
xfs_log_force(log->l_mp, XFS_LOG_SYNC);
/*
spin_lock(&log->l_icloglock);
if (test_and_set_bit(XLOG_IO_ERROR, &log->l_opstate)) {
spin_unlock(&log->l_icloglock);
- ASSERT(0);
return false;
}
spin_unlock(&log->l_icloglock);
+ /*
+ * If this log shutdown also sets the mount shutdown state, issue a
+ * shutdown warning message.
+ */
+ if (!test_and_set_bit(XFS_OPSTATE_SHUTDOWN, &log->l_mp->m_opstate)) {
+ xfs_alert_tag(log->l_mp, XFS_PTAG_SHUTDOWN_LOGERROR,
+ "Filesystem has been shut down due to log error (0x%x).",
+ shutdown_flags);
+ xfs_alert(log->l_mp,
+ "Please unmount the filesystem and rectify the problem(s).");
+ if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
+ xfs_stack_trace();
+ }
+
/*
* We don't want anybody waiting for log reservations after this. That
* means we have to wake up everybody queued up on reserveq as well as
wake_up_all(&log->l_cilp->xc_start_wait);
wake_up_all(&log->l_cilp->xc_commit_wait);
spin_unlock(&log->l_cilp->xc_push_lock);
+
+ spin_lock(&log->l_icloglock);
xlog_state_shutdown_callbacks(log);
+ spin_unlock(&log->l_icloglock);
+ wake_up_var(&log->l_opstate);
return log_error;
}