linux-kernel - [PATCH 06/10] erofs: adjust per-CPU buffers according to max

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210330003908.22842-7-hsiangkao@aol.com>
Date:   Tue, 30 Mar 2021 08:39:04 +0800
From:   Gao Xiang <hsiangkao@....com>
To:     linux-erofs@...ts.ozlabs.org, Chao Yu <yuchao0@...wei.com>,
        Chao Yu <chao@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Fang Wei <fangwei1@...wei.com>,
        Guo Weichao <guoweichao@...o.com>,
        Huang Jianan <huangjianan@...o.com>,
        Lasse Collin <lasse.collin@...aani.org>,
        Li Guifu <bluce.liguifu@...wei.com>,
        Miao Xie <miaoxie@...wei.com>, nl6720 <nl6720@...il.com>,
        Gao Xiang <hsiangkao@...hat.com>
Subject: [PATCH 06/10] erofs: adjust per-CPU buffers according to max_pclusterblks

From: Gao Xiang <hsiangkao@...hat.com>

Adjust per-CPU buffers on demand since big pcluster definition is
available. Also, bail out unsupported pcluster size according to
Z_EROFS_PCLUSTER_MAX_SIZE.

Signed-off-by: Gao Xiang <hsiangkao@...hat.com>
---
 fs/erofs/decompressor.c | 16 ++++++++++++----
 fs/erofs/internal.h     |  2 ++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index fb4838c0f0df..5d9f9dbd3681 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -32,6 +32,7 @@ int z_erofs_load_lz4_config(struct super_block *sb,
 			    struct erofs_super_block *dsb,
 			    struct z_erofs_lz4_cfgs *lz4, int size)
 {
+	struct erofs_sb_info *sbi = EROFS_SB(sb);
 	u16 distance;
 
 	if (lz4) {
@@ -40,16 +41,23 @@ int z_erofs_load_lz4_config(struct super_block *sb,
 			return -EINVAL;
 		}
 		distance = le16_to_cpu(lz4->max_distance);
+
+		sbi->lz4.max_pclusterblks = le16_to_cpu(lz4->max_pclusterblks);
+		if (sbi->lz4.max_pclusterblks >
+		    Z_EROFS_PCLUSTER_MAX_SIZE / EROFS_BLKSIZ) {
+			erofs_err(sb, "too large lz4 pcluster blocks %u",
+				  sbi->lz4.max_pclusterblks);
+			return -EINVAL;
+		}
 	} else {
 		distance = le16_to_cpu(dsb->u1.lz4_max_distance);
+		sbi->lz4.max_pclusterblks = 1;
 	}
 
-	EROFS_SB(sb)->lz4.max_distance_pages = distance ?
+	sbi->lz4.max_distance_pages = distance ?
 					DIV_ROUND_UP(distance, PAGE_SIZE) + 1 :
 					LZ4_MAX_DISTANCE_PAGES;
-
-	/* TODO: use max pclusterblks after bigpcluster is enabled */
-	return erofs_pcpubuf_growsize(1);
+	return erofs_pcpubuf_growsize(sbi->lz4.max_pclusterblks);
 }
 
 static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq,
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index c4b3938a7e56..f1305af50f67 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -63,6 +63,8 @@ struct erofs_fs_context {
 struct erofs_sb_lz4_info {
 	/* # of pages needed for EROFS lz4 rolling decompression */
 	u16 max_distance_pages;
+	/* maximum possible blocks for pclusters in the filesystem */
+	u16 max_pclusterblks;
 };
 
 struct erofs_sb_info {
-- 
2.20.1