Commit b8b902fd authored Apr 10, 2026 by Yongpeng Yang Committed by Jaegeuk Kim Apr 13, 2026

f2fs: disallow setting an extension to both cold and hot



An extension should not exist in both the cold and hot extension lists
simultaneously. When adding a hot extension, check whether it already
exists in the cold list, and vice versa. Reject the operation with
-EINVAL if a conflict is found.

Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent ed78aeeb

fs/f2fs/namei.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -83,6 +83,21 @@ int f2fs_update_extension_list(struct f2fs_sb_info sbi, const char name,
		if (set) {
		if (total_count == F2FS_MAX_EXTENSION)
		return -EINVAL;

		if (hot) {
		start = 0;
		count = cold_count;
		} else {
		start = cold_count;
		count = total_count;
		}
		for (i = start; i < count; i++) {
		if (!strcmp(name, extlist[i])) {
		f2fs_warn(sbi, "extension '%s' already exists in %s list",
		name, hot ? "cold" : "hot");
		return -EINVAL;
		}
		}
		} else {
		if (!hot && !cold_count)
		return -EINVAL;