From: James Simmons <jsimmons@infradead.org>
To: lustre-devel@lists.lustre.org
Subject: [lustre-devel] [PATCH 09/23] lustre: sec: check if page is empty with ZERO_PAGE
Date: Tue, 11 Aug 2020 08:20:05 -0400 [thread overview]
Message-ID: <1597148419-20629-10-git-send-email-jsimmons@infradead.org> (raw)
In-Reply-To: <1597148419-20629-1-git-send-email-jsimmons@infradead.org>
From: Sebastien Buisson <sbuisson@ddn.com>
In osc_brw_fini_request(), page needs decryption only if it
is not empty. To check this, use ZERO_PAGE macro available
for all architectures, and compare with memcmp.
It will likely be faster/more efficient than comparing the
words by hand as may use optimized CPU instructions or ASM code.
WC-bug-id: https://jira.whamcloud.com/browse/LU-12275
Lustre-commit: 45c26bc11b7b1e ("LU-12275 sec: check if page is empty with ZERO_PAGE")
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-on: https://review.whamcloud.com/38918
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
fs/lustre/osc/osc_request.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/fs/lustre/osc/osc_request.c b/fs/lustre/osc/osc_request.c
index 1968d62..3bbe3d9 100644
--- a/fs/lustre/osc/osc_request.c
+++ b/fs/lustre/osc/osc_request.c
@@ -2075,16 +2075,11 @@ static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
}
for (idx = 0; idx < aa->aa_page_count; idx++) {
struct brw_page *pg = aa->aa_ppga[idx];
- u64 *p, *q;
/* do not decrypt if page is all 0s */
- p = q = page_address(pg->pg);
- while (p - q < PAGE_SIZE / sizeof(*p)) {
- if (*p != 0)
- break;
- p++;
- }
- if (p - q == PAGE_SIZE / sizeof(*p)) {
+ if (memcmp(page_address(pg->pg),
+ page_address(ZERO_PAGE(0)),
+ PAGE_SIZE) == 0) {
/* if page is empty forward info to upper layers
* (ll_io_zero_page) by clearing PagePrivate2
*/
--
1.8.3.1
next prev parent reply other threads:[~2020-08-11 12:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-11 12:19 [lustre-devel] [PATCH 00/23] lustre: latest patches landed to OpenSFS 08/11/2020 James Simmons
2020-08-11 12:19 ` [lustre-devel] [PATCH 01/23] lustre: lov: one more fix to write_intent end for trunc James Simmons
2020-08-11 12:19 ` [lustre-devel] [PATCH 02/23] lustre: lov: annotate nested locking of obd_dev_mutex James Simmons
2020-08-11 12:19 ` [lustre-devel] [PATCH 03/23] lustre: ptlrpc: make ptlrpc_connection_put() static inline James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 04/23] lustre: mdc: create mdc_acl.c James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 05/23] lustre: llite: Remove mutex on dio read James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 06/23] lustre: obd: rename lprocfs_ / LPROC_SEQ_ to debugfs name James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 07/23] lustre: sec: atomicity of encryption context getting/setting James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 08/23] lustre: sec: encryption support for DoM files James Simmons
2020-08-11 12:20 ` James Simmons [this message]
2020-08-11 12:20 ` [lustre-devel] [PATCH 10/23] lustre: uapi: add OBD_CONNECT2_GETATTR_PFID James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 11/23] lustre: update version to 2.13.55 James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 12/23] lustre: sysfs: error-check value stored in jobid_var James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 13/23] lnet: Add param to control response tracking James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 14/23] lnet: Ensure LNet pings and pushes are always tracked James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 15/23] lnet: Preferred NI logic breaks MR routing James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 16/23] lnet: socklnd: remove declarations of missing functions James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 17/23] lnet: discard unused lnet_print_hdr() James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 18/23] lnet: clarify initialization of lpni_refcount James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 19/23] lnet: Allow duplicate nets in ip2nets syntax James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 20/23] lustre: llite: pack parent FID in getattr James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 21/23] lnet: Clear lp_dc_error when discovery completes James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 22/23] lnet: Have LNet routers monitor the ni_fatal flag James Simmons
2020-08-11 12:20 ` [lustre-devel] [PATCH 23/23] lnet: socklnd: NID to interface mapping issues James Simmons
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