The commit is pushed to "branch-rh9-5.14.0-284.25.1.vz9.30.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh9-5.14.0-284.25.1.vz9.30.8
------>
commit a291ae338af49a4a4c77e12169bee9813e6e971b
Author: Alexey Kuznetsov <kuz...@virtuozzo.com>
Date: Fri Oct 6 18:43:23 2023 +0800
fuse: implement acceleration for synchronous writes
https://pmc.acronis.work/browse/VSTOR-54040
Signed-off-by: Alexey Kuznetsov <kuz...@acronis.com>
Feature: vStorage
---
fs/fuse/kio/pcs/pcs_cs.c | 22 ++++++++--------------
fs/fuse/kio/pcs/pcs_cs_accel.c | 30 +++++++++++++++++++++++++++++-
2 files changed, 37 insertions(+), 15 deletions(-)
diff --git a/fs/fuse/kio/pcs/pcs_cs.c b/fs/fuse/kio/pcs/pcs_cs.c
index d298be995320..20840f8d4295 100644
--- a/fs/fuse/kio/pcs/pcs_cs.c
+++ b/fs/fuse/kio/pcs/pcs_cs.c
@@ -829,18 +829,14 @@ void pcs_cs_submit(struct pcs_cs *cs, struct
pcs_int_request *ireq)
if (pcs_csa_cs_submit(cs, ireq))
return;
} else if (ireq->iochunk.cmd == PCS_REQ_T_WRITE) {
- /* Synchronous writes in accel mode are still not
supported */
- if (!(ireq->dentry->fileinfo.attr.attrib &
PCS_FATTR_IMMEDIATE_WRITE) &&
- !ireq->dentry->no_write_delay) {
- struct pcs_int_request * sreq;
-
- sreq = pcs_csa_csl_write_submit(ireq);
- if (!sreq)
- return;
- if (sreq != ireq) {
- ireq = sreq;
- cs =
ireq->iochunk.csl->cs[ireq->iochunk.cs_index].cslink.cs;
- }
+ struct pcs_int_request * sreq;
+
+ sreq = pcs_csa_csl_write_submit(ireq);
+ if (!sreq)
+ return;
+ if (sreq != ireq) {
+ ireq = sreq;
+ cs =
ireq->iochunk.csl->cs[ireq->iochunk.cs_index].cslink.cs;
}
}
}
@@ -879,8 +875,6 @@ void pcs_cs_submit(struct pcs_cs *cs, struct
pcs_int_request *ireq)
* chain.
*/
if (idx == ireq->iochunk.cs_index ||
- (ireq->dentry->fileinfo.attr.attrib &
PCS_FATTR_IMMEDIATE_WRITE) ||
- ireq->dentry->no_write_delay ||
((ireq->iochunk.size|ireq->iochunk.offset) & 511) ||
(ireq->flags & IREQ_F_NO_ACCEL) ||
!pcs_csa_csl_write_submit_single(sreq, idx))
diff --git a/fs/fuse/kio/pcs/pcs_cs_accel.c b/fs/fuse/kio/pcs/pcs_cs_accel.c
index 5d44862e46aa..8a7e7f902ef2 100644
--- a/fs/fuse/kio/pcs/pcs_cs_accel.c
+++ b/fs/fuse/kio/pcs/pcs_cs_accel.c
@@ -827,6 +827,25 @@ static void __pcs_csa_write_final_completion(struct
pcs_accel_write_req *areq)
csa_complete_acr(ireq);
}
+static void csa_sync_work(struct work_struct *w)
+{
+ struct pcs_accel_write_req * areq = container_of(w, struct
pcs_accel_write_req, work);
+ struct pcs_int_request * ireq = container_of(areq-areq->index, struct
pcs_int_request, iochunk.acr.awr[0]);
+ int res;
+
+ res = vfs_fsync(areq->iocb.ki_filp, 1);
+
+ if (res) {
+ ireq->error.remote = 1;
+ ireq->error.offender =
ireq->iochunk.csl->cs[ireq->iochunk.cs_index].info.id;
+ ireq->error.value = PCS_ERR_IO;
+ ireq->flags |= IREQ_F_ACCELERROR;
+ }
+
+ if (atomic_dec_and_test(&areq->iocount))
+ __pcs_csa_write_final_completion(areq);
+}
+
static void csa_write_complete_work(struct work_struct *w)
{
struct pcs_accel_write_req * areq = container_of(w, struct
pcs_accel_write_req, work);
@@ -851,6 +870,15 @@ static void csa_write_complete(struct kiocb *iocb, long
ret)
}
}
+ if (!ireq->error.value) {
+ if ((ireq->dentry->fileinfo.attr.attrib &
PCS_FATTR_IMMEDIATE_WRITE) ||
+ ireq->dentry->no_write_delay) {
+ INIT_WORK(&areq->work, csa_sync_work);
+ queue_work(ireq->cc->wq, &areq->work);
+ return;
+ }
+ }
+
if (atomic_dec_and_test(&areq->iocount)) {
INIT_WORK(&areq->work, csa_write_complete_work);
queue_work(ireq->cc->wq, &areq->work);
@@ -1027,7 +1055,7 @@ static inline int csa_submit_write(struct file * file,
struct pcs_int_request *
return ret >= 0 ? -EIO : ret;
}
- /* IO already finished. Drop AIO refcnt and proceed to crc */
+ /* IO already finished. Drop AIO refcnt yet. */
FUSE_KTRACE(ireq->cc->fc, "No good, AIO executed synchronously,
ireq:%p : %llu:%u+%u",
ireq, (unsigned long long)ireq->iochunk.chunk,
(unsigned)ireq->iochunk.offset,
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