From: Chao Yu chao@kernel.org
stable inclusion from stable-v6.6.2 commit afab82ecc9d1a355be4f69601eb280f4a0dcd907 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 7e1b150fece033703a824df1bbc03df091ea53cc ]
With below script, redundant compress extension will be parsed and added by parse_options(), because parse_options() doesn't check whether the extension is existed or not, fix it.
1. mount -t f2fs -o compress_extension=so /dev/vdb /mnt/f2fs 2. mount -t f2fs -o remount,compress_extension=so /mnt/f2fs 3. mount|grep f2fs
/dev/vdb on /mnt/f2fs type f2fs (...,compress_extension=so,compress_extension=so,...)
Fixes: 4c8ff7095bef ("f2fs: support data compression") Fixes: 151b1982be5d ("f2fs: compress: add nocompress extensions support") Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/f2fs/super.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index a8c8232852bb..12790bc6e073 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -547,6 +547,29 @@ static int f2fs_set_test_dummy_encryption(struct super_block *sb, }
#ifdef CONFIG_F2FS_FS_COMPRESSION +static bool is_compress_extension_exist(struct f2fs_sb_info *sbi, + const char *new_ext, bool is_ext) +{ + unsigned char (*ext)[F2FS_EXTENSION_LEN]; + int ext_cnt; + int i; + + if (is_ext) { + ext = F2FS_OPTION(sbi).extensions; + ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt; + } else { + ext = F2FS_OPTION(sbi).noextensions; + ext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt; + } + + for (i = 0; i < ext_cnt; i++) { + if (!strcasecmp(new_ext, ext[i])) + return true; + } + + return false; +} + /* * 1. The same extension name cannot not appear in both compress and non-compress extension * at the same time. @@ -1149,6 +1172,11 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount) return -EINVAL; }
+ if (is_compress_extension_exist(sbi, name, true)) { + kfree(name); + break; + } + strcpy(ext[ext_cnt], name); F2FS_OPTION(sbi).compress_ext_cnt++; kfree(name); @@ -1173,6 +1201,11 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount) return -EINVAL; }
+ if (is_compress_extension_exist(sbi, name, false)) { + kfree(name); + break; + } + strcpy(noext[noext_cnt], name); F2FS_OPTION(sbi).nocompress_ext_cnt++; kfree(name);