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diff --git a/sys/fs/fuse/fuse_vnops.c b/sys/fs/fuse/fuse_vnops.c
--- a/sys/fs/fuse/fuse_vnops.c
+++ b/sys/fs/fuse/fuse_vnops.c
@@ -650,6 +650,7 @@
struct vnode *invp = ap->a_invp;
struct vnode *outvp = ap->a_outvp;
struct mount *mp = vnode_mount(invp);
+ struct fuse_vnode_data *outfvdat = VTOFUD(outvp);
struct fuse_dispatcher fdi;
struct fuse_filehandle *infufh, *outfufh;
struct fuse_copy_file_range_in *fcfri;
@@ -731,6 +732,8 @@
*ap->a_inoffp += fwo->size;
*ap->a_outoffp += fwo->size;
fuse_internal_clear_suid_on_write(outvp, outcred, td);
+ if (*ap->a_outoffp > outfvdat->cached_attrs.va_size)
+ fuse_vnode_setsize(outvp, *ap->a_outoffp, false);
}
fdisp_destroy(&fdi);
diff --git a/tests/sys/fs/fusefs/copy_file_range.cc b/tests/sys/fs/fusefs/copy_file_range.cc
--- a/tests/sys/fs/fusefs/copy_file_range.cc
+++ b/tests/sys/fs/fusefs/copy_file_range.cc
@@ -353,6 +353,53 @@
ASSERT_EQ(len, copy_file_range(fd, &off_in, fd, &off_out, len, 0));
}
+/*
+ * copy_file_range can extend the size of a file
+ * */
+TEST_F(CopyFileRange, extend)
+{
+ const char FULLPATH[] = "mountpoint/src.txt";
+ const char RELPATH[] = "src.txt";
+ struct stat sb;
+ const uint64_t ino = 4;
+ const uint64_t fh = 0xdeadbeefa7ebabe;
+ off_t fsize = 65536;
+ off_t off_in = 0;
+ off_t off_out = 65536;
+ ssize_t len = 65536;
+ int fd;
+
+ expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
+ expect_open(ino, 0, 1, fh);
+ EXPECT_CALL(*m_mock, process(
+ ResultOf([=](auto in) {
+ return (in.header.opcode == FUSE_COPY_FILE_RANGE &&
+ in.header.nodeid == ino &&
+ in.body.copy_file_range.fh_in == fh &&
+ (off_t)in.body.copy_file_range.off_in == off_in &&
+ in.body.copy_file_range.nodeid_out == ino &&
+ in.body.copy_file_range.fh_out == fh &&
+ (off_t)in.body.copy_file_range.off_out == off_out &&
+ in.body.copy_file_range.len == (size_t)len &&
+ in.body.copy_file_range.flags == 0);
+ }, Eq(true)),
+ _)
+ ).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
+ SET_OUT_HEADER_LEN(out, write);
+ out.body.write.size = len;
+ })));
+
+ fd = open(FULLPATH, O_RDWR);
+ ASSERT_GE(fd, 0);
+ ASSERT_EQ(len, copy_file_range(fd, &off_in, fd, &off_out, len, 0));
+
+ /* Check that cached attributes were updated appropriately */
+ ASSERT_EQ(0, fstat(fd, &sb)) << strerror(errno);
+ EXPECT_EQ(fsize + len, sb.st_size);
+
+ leak(fd);
+}
+
/* With older protocol versions, no FUSE_COPY_FILE_RANGE should be attempted */
TEST_F(CopyFileRange_7_27, fallback)
{

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