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Message-Id: <20231222032901.3861649-1-yangyongpeng1@oppo.com> Date: Fri, 22 Dec 2023 11:29:00 +0800 From: Yongpeng Yang <yangyongpeng1@...o.com> To: Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org> Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, Yongpeng Yang <yangyongpeng1@...o.com> Subject: [PATCH 1/2] f2fs: Constrain the modification range of dir_level in the sysfs The {struct f2fs_sb_info}->dir_level can be modified through the sysfs interface, but its value range is not limited. If the value exceeds MAX_DIR_HASH_DEPTH and the mount options include "noinline_dentry", the following error will occur: [root@...ora ~]# mount -o noinline_dentry /dev/sdb /mnt/sdb/ [root@...ora ~]# echo 128 > /sys/fs/f2fs/sdb/dir_level [root@...ora ~]# cd /mnt/sdb/ [root@...ora sdb]# mkdir test [root@...ora sdb]# cd test/ [root@...ora test]# mkdir test mkdir: cannot create directory 'test': Argument list too long Signed-off-by: Yongpeng Yang <yangyongpeng1@...o.com> --- fs/f2fs/sysfs.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 7099ffa57299..8c8424b05fc7 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -741,6 +741,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a, return count; } + if (!strcmp(a->attr.name, "dir_level")) { + if (t > MAX_DIR_HASH_DEPTH) + return -EINVAL; + sbi->dir_level = t; + return count; + } + *ui = (unsigned int)t; return count; -- 2.40.1
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