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 @@ -1980,7 +1980,24 @@ fuse_filehandle_close(vp, fufh, td, NULL); } - if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) { + if (VTOI(vp) == 1) { + /* + * Don't send FUSE_FORGET for the root inode, because + * we never send FUSE_LOOKUP for it (see + * fuse_vfsop_root) and we don't want the server to see + * mismatched lookup counts. + */ + struct fuse_data *data; + struct vnode *vroot; + + data = fuse_get_mpdata(vnode_mount(vp)); + FUSE_LOCK(); + vroot = data->vroot; + data->vroot = NULL; + FUSE_UNLOCK(); + if (vroot) + vrele(vroot); + } else if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) { fuse_internal_forget_send(vnode_mount(vp), td, NULL, VTOI(vp), fvdat->nlookup); } diff --git a/tests/sys/fs/fusefs/destroy.cc b/tests/sys/fs/fusefs/destroy.cc --- a/tests/sys/fs/fusefs/destroy.cc +++ b/tests/sys/fs/fusefs/destroy.cc @@ -141,7 +141,6 @@ uint64_t ino = 42; expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 2); - expect_forget(FUSE_ROOT_ID, 1); expect_forget(ino, 2); expect_destroy(0); diff --git a/tests/sys/fs/fusefs/dev_fuse_poll.cc b/tests/sys/fs/fusefs/dev_fuse_poll.cc --- a/tests/sys/fs/fusefs/dev_fuse_poll.cc +++ b/tests/sys/fs/fusefs/dev_fuse_poll.cc @@ -93,7 +93,6 @@ /* Ensure that we wake up pollers during unmount */ TEST_P(DevFusePoll, destroy) { - expect_forget(FUSE_ROOT_ID, 1); expect_destroy(0); m_mock->unmount(); diff --git a/tests/sys/fs/fusefs/forget.cc b/tests/sys/fs/fusefs/forget.cc --- a/tests/sys/fs/fusefs/forget.cc +++ b/tests/sys/fs/fusefs/forget.cc @@ -32,6 +32,7 @@ extern "C" { #include +#include #include #include @@ -145,3 +146,35 @@ /* Access the file again, causing another lookup */ ASSERT_EQ(0, access(FULLFPATH, F_OK)) << strerror(errno); } + +/* + * Reclaiming the root inode should not send a FUSE_FORGET request, nor should + * it interfere with further lookup operations. + */ +TEST_F(Forget, root) +{ + const char FULLPATH[] = "mountpoint/some_file.txt"; + const char RELPATH[] = "some_file.txt"; + uint64_t ino = 42; + mode_t mode = S_IFREG | 0755; + + EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH) + .WillRepeatedly(Invoke( + ReturnImmediate([=](auto in __unused, auto& out) { + SET_OUT_HEADER_LEN(out, entry); + out.body.entry.attr.mode = mode; + out.body.entry.nodeid = ino; + out.body.entry.attr.nlink = 1; + out.body.entry.attr_valid = UINT64_MAX; + out.body.entry.entry_valid = UINT64_MAX; + }))); + + /* access(2) the file to force a lookup. */ + ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno); + + reclaim_vnode("mountpoint"); + nap(); + + /* Access it again, to make sure it's still possible. */ + ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno); +} diff --git a/tests/sys/fs/fusefs/lookup.cc b/tests/sys/fs/fusefs/lookup.cc --- a/tests/sys/fs/fusefs/lookup.cc +++ b/tests/sys/fs/fusefs/lookup.cc @@ -263,7 +263,6 @@ ).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) { SET_OUT_HEADER_LEN(out, open); }))); - expect_forget(FUSE_ROOT_ID, 1, NULL); expect_forget(foo_ino, 1, NULL); fd = open("mountpoint/foo/bar", O_EXEC| O_DIRECTORY); @@ -574,7 +573,6 @@ ).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) { SET_OUT_HEADER_LEN(out, open); }))); - expect_forget(FUSE_ROOT_ID, 1, NULL); expect_forget(foo_ino, 1, NULL); EXPECT_LOOKUP(bar_ino, "..") .WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {