[lustre-devel] [PATCH 130/622] lustre: ptlrpc: don't change buffer when signature is ready
James Simmons
jsimmons at infradead.org
Thu Feb 27 13:09:58 PST 2020
From: Mikhail Pershin <mpershin at whamcloud.com>
The lm_repsize is part of buffer being used in signature calculation
and must not be changed after calculation is done.
Patch reverts related changes from commit 13372d6c and moves related
lm_repsize update into MDC where DOM read-on-open buffer is prepared
WC-bug-id: https://jira.whamcloud.com/browse/LU-11414
Lustre-commit: cf503e047c7f ("LU-11414 ptlrpc: don't change buffer when signature is ready")
Signed-off-by: Mikhail Pershin <mpershin at whamcloud.com>
Reviewed-on: https://review.whamcloud.com/33223
Reviewed-by: Andreas Dilger <adilger at whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson at ddn.com>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
fs/lustre/mdc/mdc_locks.c | 30 +++++++++++++++++++++---------
fs/lustre/ptlrpc/niobuf.c | 5 -----
2 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/fs/lustre/mdc/mdc_locks.c b/fs/lustre/mdc/mdc_locks.c
index 80f2e10..09f9bc5 100644
--- a/fs/lustre/mdc/mdc_locks.c
+++ b/fs/lustre/mdc/mdc_locks.c
@@ -256,7 +256,7 @@ static int mdc_save_lovea(struct ptlrpc_request *req,
int count = 0;
enum ldlm_mode mode;
int rc;
- int repsize;
+ int repsize, repsize_estimate;
it->it_create_mode = (it->it_create_mode & ~S_IFMT) | S_IFREG;
@@ -347,22 +347,34 @@ static int mdc_save_lovea(struct ptlrpc_request *req,
/* Get real repbuf allocated size as rounded up power of 2 */
repsize = size_roundup_power2(req->rq_replen +
lustre_msg_early_size());
-
/* Estimate free space for DoM files in repbuf */
- repsize -= req->rq_replen - obddev->u.cli.cl_max_mds_easize +
- sizeof(struct lov_comp_md_v1) +
- sizeof(struct lov_comp_md_entry_v1) +
- lov_mds_md_size(0, LOV_MAGIC_V3);
-
- if (repsize < obddev->u.cli.cl_dom_min_inline_repsize) {
- repsize = obddev->u.cli.cl_dom_min_inline_repsize - repsize;
+ repsize_estimate = repsize - (req->rq_replen -
+ obddev->u.cli.cl_max_mds_easize +
+ sizeof(struct lov_comp_md_v1) +
+ sizeof(struct lov_comp_md_entry_v1) +
+ lov_mds_md_size(0, LOV_MAGIC_V3));
+
+ if (repsize_estimate < obddev->u.cli.cl_dom_min_inline_repsize) {
+ repsize = obddev->u.cli.cl_dom_min_inline_repsize -
+ repsize_estimate + sizeof(struct niobuf_remote);
req_capsule_set_size(&req->rq_pill, &RMF_NIOBUF_INLINE,
RCL_SERVER,
sizeof(struct niobuf_remote) + repsize);
ptlrpc_request_set_replen(req);
CDEBUG(D_INFO, "Increase repbuf by %d bytes, total: %d\n",
repsize, req->rq_replen);
+ repsize = size_roundup_power2(req->rq_replen +
+ lustre_msg_early_size());
}
+ /* The only way to report real allocated repbuf size to the server
+ * is the lm_repsize but it must be set prior buffer allocation itself
+ * due to security reasons - it is part of buffer used in signature
+ * calculation (see LU-11414). Therefore the saved size is predicted
+ * value as rq_replen rounded to the next higher power of 2.
+ * Such estimation is safe. Though the final allocated buffer might
+ * be even larger, it is not possible to know that at this point.
+ */
+ req->rq_reqmsg->lm_repsize = repsize;
return req;
}
diff --git a/fs/lustre/ptlrpc/niobuf.c b/fs/lustre/ptlrpc/niobuf.c
index e8ba57b..2e866fe 100644
--- a/fs/lustre/ptlrpc/niobuf.c
+++ b/fs/lustre/ptlrpc/niobuf.c
@@ -617,11 +617,6 @@ int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
request->rq_status = rc;
goto cleanup_bulk;
}
- /* Use real allocated value in lm_repsize,
- * so the server may use whole reply buffer
- * without resends where it is needed.
- */
- request->rq_reqmsg->lm_repsize = request->rq_repbuf_len;
} else {
request->rq_repdata = NULL;
request->rq_repmsg = NULL;
--
1.8.3.1
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