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fusefs: implement FUSE_NO_OPEN_SUPPORT and FUSE_NO_OPENDIR_SUPPORT

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For file systems that allow it, fusefs will skip FUSE_OPEN,
FUSE_RELEASE, FUSE_OPENDIR, and FUSE_RELEASEDIR operations, a minor
optimization.

MFC after:	2 weeks
Reviewed by:	pfg
Differential Revision: https://reviews.freebsd.org/D32141
This commit is contained in:
Alan Somers 2021-09-24 21:53:28 -06:00
parent a3a1ce3794
commit 7124d2bc3a
7 changed files with 172 additions and 20 deletions
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61
sys/fs/fuse/fuse_file.c
View File

@ -124,44 +124,68 @@ int
fuse_filehandle_open(struct vnode *vp, int a_mode,
struct fuse_filehandle **fufhp, struct thread *td, struct ucred *cred)
{
struct mount *mp = vnode_mount(vp);
struct fuse_data *data = fuse_get_mpdata(mp);
struct fuse_dispatcher fdi;
struct fuse_open_in *foi;
struct fuse_open_out *foo;
const struct fuse_open_out default_foo = {
.fh = 0,
.open_flags = FOPEN_KEEP_CACHE,
.padding = 0
};
struct fuse_open_in *foi = NULL;
const struct fuse_open_out *foo;
fufh_type_t fufh_type;
int dataflags = data->dataflags;
int err = 0;
int oflags = 0;
int op = FUSE_OPEN;
int relop = FUSE_RELEASE;
int fsess_no_op_support = FSESS_NO_OPEN_SUPPORT;
fufh_type = fflags_2_fufh_type(a_mode);
oflags = fufh_type_2_fflags(fufh_type);
if (vnode_isdir(vp)) {
op = FUSE_OPENDIR;
relop = FUSE_RELEASEDIR;
fsess_no_op_support = FSESS_NO_OPENDIR_SUPPORT;
/* vn_open_vnode already rejects FWRITE on directories */
MPASS(fufh_type == FUFH_RDONLY || fufh_type == FUFH_EXEC);
}
fdisp_init(&fdi, sizeof(*foi));
fdisp_make_vp(&fdi, op, vp, td, cred);
if (fsess_not_impl(mp, op) && dataflags & fsess_no_op_support) {
/* The operation implicitly succeeds */
foo = &default_foo;
} else {
fdisp_make_vp(&fdi, op, vp, td, cred);
foi = fdi.indata;
foi->flags = oflags;
foi = fdi.indata;
foi->flags = oflags;
if ((err = fdisp_wait_answ(&fdi))) {
SDT_PROBE2(fusefs, , file, trace, 1,
"OUCH ... daemon didn't give fh");
if (err == ENOENT) {
fuse_internal_vnode_disappear(vp);
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS && dataflags & fsess_no_op_support) {
/* The operation implicitly succeeds */
foo = &default_foo;
fsess_set_notimpl(mp, op);
fsess_set_notimpl(mp, relop);
err = 0;
} else if (err) {
SDT_PROBE2(fusefs, , file, trace, 1,
"OUCH ... daemon didn't give fh");
if (err == ENOENT)
fuse_internal_vnode_disappear(vp);
goto out;
} else {
foo = fdi.answ;
}
goto out;
}
foo = fdi.answ;
fuse_filehandle_init(vp, fufh_type, fufhp, td, cred, foo);
fuse_vnode_open(vp, foo->open_flags, td);
out:
fdisp_destroy(&fdi);
if (foi)
fdisp_destroy(&fdi);
return err;
}
@ -169,6 +193,7 @@ int
fuse_filehandle_close(struct vnode *vp, struct fuse_filehandle *fufh,
struct thread *td, struct ucred *cred)
{
struct mount *mp = vnode_mount(vp);
struct fuse_dispatcher fdi;
struct fuse_release_in *fri;
@ -180,6 +205,10 @@ fuse_filehandle_close(struct vnode *vp, struct fuse_filehandle *fufh,
}
if (vnode_isdir(vp))
op = FUSE_RELEASEDIR;
if (fsess_not_impl(mp, op))
goto out;
fdisp_init(&fdi, sizeof(*fri));
fdisp_make_vp(&fdi, op, vp, td, cred);
fri = fdi.indata;
@ -327,8 +356,8 @@ fuse_filehandle_getrw(struct vnode *vp, int fflag,
void
fuse_filehandle_init(struct vnode *vp, fufh_type_t fufh_type,
struct fuse_filehandle **fufhp, struct thread *td, struct ucred *cred,
struct fuse_open_out *foo)
struct fuse_filehandle **fufhp, struct thread *td, const struct ucred *cred,
const struct fuse_open_out *foo)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct fuse_filehandle *fufh;

3
sys/fs/fuse/fuse_file.h
View File

@ -211,7 +211,8 @@ int fuse_filehandle_getrw(struct vnode *vp, int fflag,
void fuse_filehandle_init(struct vnode *vp, fufh_type_t fufh_type,
struct fuse_filehandle **fufhp, struct thread *td,
struct ucred *cred, struct fuse_open_out *foo);
const struct ucred *cred,
const struct fuse_open_out *foo);
int fuse_filehandle_open(struct vnode *vp, int mode,
struct fuse_filehandle **fufhp, struct thread *td,
struct ucred *cred);

8
sys/fs/fuse/fuse_internal.c
View File

@ -1009,6 +1009,10 @@ fuse_internal_init_callback(struct fuse_ticket *tick, struct uio *uio)
data->dataflags |= FSESS_POSIX_LOCKS;
if (fiio->flags & FUSE_EXPORT_SUPPORT)
data->dataflags |= FSESS_EXPORT_SUPPORT;
if (fiio->flags & FUSE_NO_OPEN_SUPPORT)
data->dataflags |= FSESS_NO_OPEN_SUPPORT;
if (fiio->flags & FUSE_NO_OPENDIR_SUPPORT)
data->dataflags |= FSESS_NO_OPENDIR_SUPPORT;
/*
* Don't bother to check FUSE_BIG_WRITES, because it's
* redundant with max_write
@ -1098,7 +1102,6 @@ fuse_internal_send_init(struct fuse_data *data, struct thread *td)
* FUSE_DO_READDIRPLUS: not yet implemented
* FUSE_READDIRPLUS_AUTO: not yet implemented
* FUSE_ASYNC_DIO: not yet implemented
* FUSE_NO_OPEN_SUPPORT: not yet implemented
* FUSE_PARALLEL_DIROPS: not yet implemented
* FUSE_HANDLE_KILLPRIV: not yet implemented
* FUSE_POSIX_ACL: not yet implemented
@ -1107,7 +1110,8 @@ fuse_internal_send_init(struct fuse_data *data, struct thread *td)
* FUSE_MAX_PAGES: not yet implemented
*/
fiii->flags = FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_EXPORT_SUPPORT
| FUSE_BIG_WRITES | FUSE_WRITEBACK_CACHE;
| FUSE_BIG_WRITES | FUSE_WRITEBACK_CACHE
| FUSE_NO_OPEN_SUPPORT | FUSE_NO_OPENDIR_SUPPORT;
fuse_insert_callback(fdi.tick, fuse_internal_init_callback);
fuse_insert_message(fdi.tick, false);

2
sys/fs/fuse/fuse_ipc.h
View File

@ -229,6 +229,8 @@ struct fuse_data {
/* (and being observed by the daemon) */
#define FSESS_PUSH_SYMLINKS_IN 0x0020 /* prefix absolute symlinks with mp */
#define FSESS_DEFAULT_PERMISSIONS 0x0040 /* kernel does permission checking */
#define FSESS_NO_OPEN_SUPPORT 0x0080 /* can elide FUSE_OPEN ops */
#define FSESS_NO_OPENDIR_SUPPORT 0x0100 /* can elide FUSE_OPENDIR ops */
#define FSESS_ASYNC_READ 0x1000 /* allow multiple reads of some file */
#define FSESS_POSIX_LOCKS 0x2000 /* daemon supports POSIX locks */
#define FSESS_EXPORT_SUPPORT 0x10000 /* daemon supports NFS-style lookups */

4
sys/fs/fuse/fuse_kernel.h
View File

@ -198,7 +198,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 28
#define FUSE_KERNEL_MINOR_VERSION 29
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -300,6 +300,7 @@ struct fuse_file_lock {
* FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED
* FUSE_MAX_PAGES: init_out.max_pages contains the max number of req pages
* FUSE_CACHE_SYMLINKS: cache READLINK responses
* FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -325,6 +326,7 @@ struct fuse_file_lock {
#define FUSE_ABORT_ERROR (1 << 21)
#define FUSE_MAX_PAGES (1 << 22)
#define FUSE_CACHE_SYMLINKS (1 << 23)
#define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
#ifdef linux
/**

66
tests/sys/fs/fusefs/open.cc
View File

@ -73,6 +73,13 @@ void test_ok(int os_flags, int fuse_flags) {
};
class OpenNoOpenSupport: public FuseTest {
virtual void SetUp() {
m_init_flags = FUSE_NO_OPEN_SUPPORT;
FuseTest::SetUp();
}
};
/*
* fusefs(5) does not support I/O on device nodes (neither does UFS). But it
* shouldn't crash
@ -274,3 +281,62 @@ TEST_F(Open, o_rdwr)
test_ok(O_RDWR, O_RDWR);
}
/*
* Without FUSE_NO_OPEN_SUPPORT, returning ENOSYS is an error
*/
TEST_F(Open, enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
uint64_t ino = 42;
int fd;
FuseTest::expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_OPEN &&
in.body.open.flags == (uint32_t)O_RDONLY &&
in.header.nodeid == ino);
}, Eq(true)),
_)
).Times(1)
.WillOnce(Invoke(ReturnErrno(ENOSYS)));
fd = open(FULLPATH, O_RDONLY);
ASSERT_EQ(-1, fd) << strerror(errno);
EXPECT_EQ(ENOSYS, errno);
}
/*
* If a fuse server sets FUSE_NO_OPEN_SUPPORT and returns ENOSYS to a
* FUSE_OPEN, then it and subsequent FUSE_OPEN and FUSE_RELEASE operations will
* also succeed automatically without being sent to the server.
*/
TEST_F(OpenNoOpenSupport, enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
uint64_t ino = 42;
int fd;
FuseTest::expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 2);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_OPEN &&
in.body.open.flags == (uint32_t)O_RDONLY &&
in.header.nodeid == ino);
}, Eq(true)),
_)
).Times(1)
.WillOnce(Invoke(ReturnErrno(ENOSYS)));
expect_flush(ino, 1, ReturnErrno(ENOSYS));
fd = open(FULLPATH, O_RDONLY);
ASSERT_LE(0, fd) << strerror(errno);
close(fd);
fd = open(FULLPATH, O_RDONLY);
ASSERT_LE(0, fd) << strerror(errno);
leak(fd);
}

48
tests/sys/fs/fusefs/opendir.cc
View File

@ -73,6 +73,13 @@ void expect_opendir(uint64_t ino, uint32_t flags, ProcessMockerT r)
};
class OpendirNoOpendirSupport: public Opendir {
virtual void SetUp() {
m_init_flags = FUSE_NO_OPENDIR_SUPPORT;
FuseTest::SetUp();
}
};
/*
* The fuse daemon fails the request with enoent. This usually indicates a
@ -172,3 +179,44 @@ TEST_F(Opendir, opendir)
errno = 0;
EXPECT_NE(nullptr, opendir(FULLPATH)) << strerror(errno);
}
/*
* Without FUSE_NO_OPENDIR_SUPPORT, returning ENOSYS is an error
*/
TEST_F(Opendir, enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
uint64_t ino = 42;
expect_lookup(RELPATH, ino);
expect_opendir(ino, O_RDONLY, ReturnErrno(ENOSYS));
EXPECT_EQ(-1, open(FULLPATH, O_DIRECTORY));
EXPECT_EQ(ENOSYS, errno);
}
/*
* If a fuse server sets FUSE_NO_OPENDIR_SUPPORT and returns ENOSYS to a
* FUSE_OPENDIR, then it and subsequent FUSE_OPENDIR and FUSE_RELEASEDIR
* operations will also succeed automatically without being sent to the server.
*/
TEST_F(OpendirNoOpendirSupport, enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
uint64_t ino = 42;
int fd;
FuseTest::expect_lookup(RELPATH, ino, S_IFDIR | 0755, 0, 2);
expect_opendir(ino, O_RDONLY, ReturnErrno(ENOSYS));
fd = open(FULLPATH, O_DIRECTORY);
ASSERT_LE(0, fd) << strerror(errno);
close(fd);
fd = open(FULLPATH, O_DIRECTORY);
ASSERT_LE(0, fd) << strerror(errno);
leak(fd);
}