From: Gabriel Krisman Bertazi krisman@collabora.com
[ Upstream commit 20d0a107fb35f37578b919f62bd474d6d358d579 ]
Reading past end of file returns EOF for aligned reads but -EINVAL for unaligned reads on f2fs. While documentation is not strict about this corner case, most filesystem returns EOF on this case, like iomap filesystems. This patch consolidates the behavior for f2fs, by making it return EOF(0).
it can be verified by a read loop on a file that does a partial read before EOF (A file that doesn't end at an aligned address). The following code fails on an unaligned file on f2fs, but not on btrfs, ext4, and xfs.
while (done < total) { ssize_t delta = pread(fd, buf + done, total - done, off + done); if (!delta) break; ... }
It is arguable whether filesystems should actually return EOF or -EINVAL, but since iomap filesystems support it, and so does the original DIO code, it seems reasonable to consolidate on that.
Signed-off-by: Gabriel Krisman Bertazi krisman@collabora.com Reviewed-by: Chao Yu yuchao0@huawei.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/data.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index ec9a1f9ce2dd6..68be334afc286 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2753,6 +2753,9 @@ static int check_direct_IO(struct inode *inode, struct iov_iter *iter, unsigned long align = offset | iov_iter_alignment(iter); struct block_device *bdev = inode->i_sb->s_bdev;
+ if (iov_iter_rw(iter) == READ && offset >= i_size_read(inode)) + return 1; + if (align & blocksize_mask) { if (bdev) blkbits = blksize_bits(bdev_logical_block_size(bdev));