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f2fs: avoid to create an empty string as the extension_list 

When creating a file, we need to set the temperature based on
extension_list. If the empty string is a valid extension_list,
the is_extension_exist will always returns true,
which affects the separation of hot and cold.

Signed-off-by: Wang Xiaojun <wangxiaojun11@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Wang Xiaojun 2021-07-09 16:34:53 +08:00 committed by Jaegeuk Kim
parent 01f6afd0f3
commit 5417c98c12
1 changed files with 1 additions and 1 deletions
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2
fs/f2fs/sysfs.c
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@ -351,7 +351,7 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
set = false; set = false;
} }
if (strlen(name) >= F2FS_EXTENSION_LEN) if (!strlen(name) || strlen(name) >= F2FS_EXTENSION_LEN)
return -EINVAL; return -EINVAL;
down_write(&sbi->sb_lock); down_write(&sbi->sb_lock);