From 5fed0be8583f08c1548b4dcd9e5ee0d1133d0730 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Fri, 7 Jan 2022 20:08:45 -0800 Subject: [PATCH] f2fs: do not allow partial truncation on pinned file If the pinned file has a hole by partial truncation, application that has the block map will be broken. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index f540c1cbddca..3c98ef6af97d 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1750,7 +1750,11 @@ static long f2fs_fallocate(struct file *file, int mode, (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE))) return -EOPNOTSUPP; - if (f2fs_compressed_file(inode) && + /* + * Pinned file should not support partial trucation since the block + * can be used by applications. + */ + if ((f2fs_compressed_file(inode) || f2fs_is_pinned_file(inode)) && (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE))) return -EOPNOTSUPP;