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authorChristoph Hellwig <hch@lst.de>2017-02-07 14:07:58 -0800
committerDarrick J. Wong <darrick.wong@oracle.com>2017-02-09 11:36:40 -0800
commit4560e78f40cb55bd2ea8f1ef4001c5baa88531c7 (patch)
tree8dc0b7babd87706130fbc1f7acc86f53eb6754a7 /fs/xfs/xfs_log_cil.c
parent46694129816851cb323e4bcf2dc41482d8d6c19b (diff)
xfs: don't block the log commit handler for discards
Instead we submit the discard requests and use another workqueue to release the extents from the extent busy list. 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>
Diffstat (limited to 'fs/xfs/xfs_log_cil.c')
-rw-r--r--fs/xfs/xfs_log_cil.c84
1 files changed, 76 insertions, 8 deletions
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index a4ab192e1792..82f1cbcc4de1 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -30,6 +30,9 @@
#include "xfs_trans_priv.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
+#include "xfs_trace.h"
+
+struct workqueue_struct *xfs_discard_wq;
/*
* Allocate a new ticket. Failing to get a new ticket makes it really hard to
@@ -491,6 +494,75 @@ xlog_cil_free_logvec(
}
}
+static void
+xlog_discard_endio_work(
+ struct work_struct *work)
+{
+ struct xfs_cil_ctx *ctx =
+ container_of(work, struct xfs_cil_ctx, discard_endio_work);
+ struct xfs_mount *mp = ctx->cil->xc_log->l_mp;
+
+ xfs_extent_busy_clear(mp, &ctx->busy_extents, false);
+ kmem_free(ctx);
+}
+
+/*
+ * Queue up the actual completion to a thread to avoid IRQ-safe locking for
+ * pagb_lock. Note that we need a unbounded workqueue, otherwise we might
+ * get the execution delayed up to 30 seconds for weird reasons.
+ */
+static void
+xlog_discard_endio(
+ struct bio *bio)
+{
+ struct xfs_cil_ctx *ctx = bio->bi_private;
+
+ INIT_WORK(&ctx->discard_endio_work, xlog_discard_endio_work);
+ queue_work(xfs_discard_wq, &ctx->discard_endio_work);
+}
+
+static void
+xlog_discard_busy_extents(
+ struct xfs_mount *mp,
+ struct xfs_cil_ctx *ctx)
+{
+ struct list_head *list = &ctx->busy_extents;
+ struct xfs_extent_busy *busyp;
+ struct bio *bio = NULL;
+ struct blk_plug plug;
+ int error = 0;
+
+ ASSERT(mp->m_flags & XFS_MOUNT_DISCARD);
+
+ blk_start_plug(&plug);
+ list_for_each_entry(busyp, list, list) {
+ trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
+ busyp->length);
+
+ error = __blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
+ XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
+ XFS_FSB_TO_BB(mp, busyp->length),
+ GFP_NOFS, 0, &bio);
+ if (error && error != -EOPNOTSUPP) {
+ xfs_info(mp,
+ "discard failed for extent [0x%llx,%u], error %d",
+ (unsigned long long)busyp->bno,
+ busyp->length,
+ error);
+ break;
+ }
+ }
+
+ if (bio) {
+ bio->bi_private = ctx;
+ bio->bi_end_io = xlog_discard_endio;
+ submit_bio(bio);
+ } else {
+ xlog_discard_endio_work(&ctx->discard_endio_work);
+ }
+ blk_finish_plug(&plug);
+}
+
/*
* Mark all items committed and clear busy extents. We free the log vector
* chains in a separate pass so that we unpin the log items as quickly as
@@ -525,14 +597,10 @@ xlog_cil_committed(
xlog_cil_free_logvec(ctx->lv_chain);
- if (!list_empty(&ctx->busy_extents)) {
- ASSERT(mp->m_flags & XFS_MOUNT_DISCARD);
-
- xfs_discard_extents(mp, &ctx->busy_extents);
- xfs_extent_busy_clear(mp, &ctx->busy_extents, false);
- }
-
- kmem_free(ctx);
+ if (!list_empty(&ctx->busy_extents))
+ xlog_discard_busy_extents(mp, ctx);
+ else
+ kmem_free(ctx);
}
/*