From: Amir Goldstein Date: Mon, 14 Oct 2024 19:27:59 +0000 (+0200) Subject: fuse: update inode size after extending passthrough write X-Git-Tag: v6.12-rc5~9^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=20121d3f58f06e977ca43eb6efe1fb23b1d2f6d9;p=thirdparty%2Fkernel%2Flinux.git fuse: update inode size after extending passthrough write yangyun reported that libfuse test test_copy_file_range() copies zero bytes from a newly written file when fuse passthrough is enabled. The reason is that extending passthrough write is not updating the fuse inode size and when vfs_copy_file_range() observes a zero size inode, it returns without calling the filesystem copy_file_range() method. Fix this by adjusting the fuse inode size after an extending passthrough write. This does not provide cache coherency of fuse inode attributes and backing inode attributes, but it should prevent situations where fuse inode size is too small, causing read/copy to be wrongly shortened. Reported-by: yangyun Closes: https://github.com/libfuse/libfuse/issues/1048 Fixes: 57e1176e6086 ("fuse: implement read/write passthrough") Signed-off-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c index e4e92abe1601d..7b097e332a904 100644 --- a/fs/fuse/passthrough.c +++ b/fs/fuse/passthrough.c @@ -22,7 +22,7 @@ static void fuse_passthrough_end_write(struct file *file, loff_t pos, ssize_t re { struct inode *inode = file_inode(file); - fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE); + fuse_write_update_attr(inode, pos, ret); } ssize_t fuse_passthrough_read_iter(struct kiocb *iocb, struct iov_iter *iter)