linux-kernel - [PATCH] f2fs: don't drop compressed page cache in .{invalidate,release}page

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 for Android: free password hash cracker in your pocket

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

Date:   Thu, 16 Dec 2021 17:08:30 +0800
From:   Chao Yu <chao@...nel.org>
To:     jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <chao@...nel.org>
Subject: [PATCH] f2fs: don't drop compressed page cache in .{invalidate,release}page

For compressed inode, in .{invalidate,release}page, we will call
f2fs_invalidate_compress_pages() to drop all compressed page cache of
current inode.

But we don't need to drop compressed page cache synchronously in
.invalidatepage, because, all trancation paths of compressed physical
block has been covered with f2fs_invalidate_compress_page().

And also we don't need to drop compressed page cache synchronously
in .releasepage, because, if there is out-of-memory, we can count
on page cache reclaim on sbi->compress_inode.

BTW, this patch may fix the issue reported below:

https://lore.kernel.org/linux-f2fs-devel/20211202092812.197647-1-changfengnan@vivo.com/T/#u

Signed-off-by: Chao Yu <chao@...nel.org>
---
 fs/f2fs/data.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 2737fcc0dbcf..40274c32dbc0 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3528,12 +3528,9 @@ void f2fs_invalidate_page(struct page *page, unsigned int offset,
 
 	clear_page_private_gcing(page);
 
-	if (test_opt(sbi, COMPRESS_CACHE)) {
-		if (f2fs_compressed_file(inode))
-			f2fs_invalidate_compress_pages(sbi, inode->i_ino);
-		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
-			clear_page_private_data(page);
-	}
+	if (test_opt(sbi, COMPRESS_CACHE) &&
+			inode->i_ino == F2FS_COMPRESS_INO(sbi))
+		clear_page_private_data(page);
 
 	if (page_private_atomic(page))
 		return f2fs_drop_inmem_page(inode, page);
@@ -3552,15 +3549,10 @@ int f2fs_release_page(struct page *page, gfp_t wait)
 	if (page_private_atomic(page))
 		return 0;
 
-	if (test_opt(F2FS_P_SB(page), COMPRESS_CACHE)) {
-		struct f2fs_sb_info *sbi = F2FS_P_SB(page);
-		struct inode *inode = page->mapping->host;
-
-		if (f2fs_compressed_file(inode))
-			f2fs_invalidate_compress_pages(sbi, inode->i_ino);
-		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
-			clear_page_private_data(page);
-	}
+	if (test_opt(F2FS_P_SB(page), COMPRESS_CACHE) &&
+			inode->i_ino ==
+			F2FS_COMPRESS_INO(F2FS_I_SB(page->mapping->host)))
+		clear_page_private_data(page);
 
 	clear_page_private_gcing(page);
 
-- 
2.32.0