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fusefs: update FUSE protocol to 7.24 and implement FUSE_LSEEK

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FUSE_LSEEK reports holes on fuse file systems, and is used for example
by bsdtar.

MFC after:	2 weeks
Relnotes:	yes
Reviewed by:	cem
Differential Revision: https://reviews.freebsd.org/D27804
This commit is contained in:
Alan Somers 2020-12-28 17:26:31 -07:00
parent 68de3bb59f
commit 37df9d3bba
10 changed files with 587 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
sys/fs/fuse/fuse_internal.c
View File

@ -219,7 +219,7 @@ fuse_internal_access(struct vnode *vp,
SDT_PROBE0(fusefs, , internal, access_vadmin);
}
if (!fsess_isimpl(mp, FUSE_ACCESS))
if (fsess_not_impl(mp, FUSE_ACCESS))
return 0;
if ((mode & (VWRITE | VAPPEND)) != 0)
@ -337,14 +337,14 @@ fuse_internal_fsync(struct vnode *vp,
int op = FUSE_FSYNC;
int err = 0;
if (!fsess_isimpl(vnode_mount(vp),
if (fsess_not_impl(vnode_mount(vp),
(vnode_vtype(vp) == VDIR ? FUSE_FSYNCDIR : FUSE_FSYNC))) {
return 0;
}
if (vnode_isdir(vp))
op = FUSE_FSYNCDIR;
if (!fsess_isimpl(mp, op))
if (fsess_not_impl(mp, op))
return 0;
fdisp_init(&fdi, sizeof(*ffsi));
@ -1051,6 +1051,9 @@ fuse_internal_init_callback(struct fuse_ticket *tick, struct uio *uio)
else
data->cache_mode = FUSE_CACHE_WT;
if (!fuse_libabi_geq(data, 7, 24))
fsess_set_notimpl(data->mp, FUSE_LSEEK);
out:
if (err) {
fdata_set_dead(data);

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

@ -230,7 +230,7 @@ fuse_interrupt_send(struct fuse_ticket *otick, int err)
* If the fuse daemon doesn't support interrupts, then there's
* nothing more that we can do
*/
if (!fsess_isimpl(data->mp, FUSE_INTERRUPT))
if (fsess_not_impl(data->mp, FUSE_INTERRUPT))
return;
/*
@ -423,7 +423,7 @@ fticket_wait_answer(struct fuse_ticket *ftick)
struct fuse_data *data = ftick->tk_data;
bool interrupted = false;
if (fsess_isimpl(ftick->tk_data->mp, FUSE_INTERRUPT) &&
if (fsess_maybe_impl(ftick->tk_data->mp, FUSE_INTERRUPT) &&
data->dataflags & FSESS_INTR) {
SIGEMPTYSET(blockedset);
} else {
@ -851,6 +851,10 @@ fuse_body_audit(struct fuse_ticket *ftick, size_t blen)
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_LSEEK:
err = (blen == sizeof(struct fuse_lseek_out)) ? 0 : EINVAL;
break;
default:
panic("FUSE: opcodes out of sync (%d)\n", opcode);
}

37
sys/fs/fuse/fuse_ipc.h
View File

@ -212,7 +212,15 @@ struct fuse_data {
int daemon_timeout;
int linux_errnos;
unsigned time_gran;
/* A bitmask of FUSE RPCs that are not implemented by the server */
uint64_t notimpl;
/*
* A bitmask of FUSE RPCs that are implemented by the server.
* If an operation is not present in either notimpl or isimpl, then it
* may be implemented by the server, but the kernel doesn't know for
* sure.
*/
uint64_t isimpl;
uint64_t mnt_flag;
enum fuse_data_cache_mode cache_mode;
};
@ -240,13 +248,40 @@ fuse_get_mpdata(struct mount *mp)
}
static inline bool
fsess_isimpl(struct mount *mp, int opcode)
fsess_is_impl(struct mount *mp, int opcode)
{
struct fuse_data *data = fuse_get_mpdata(mp);
return ((data->isimpl & (1ULL << opcode)) != 0);
}
static inline bool
fsess_maybe_impl(struct mount *mp, int opcode)
{
struct fuse_data *data = fuse_get_mpdata(mp);
return ((data->notimpl & (1ULL << opcode)) == 0);
}
static inline bool
fsess_not_impl(struct mount *mp, int opcode)
{
struct fuse_data *data = fuse_get_mpdata(mp);
return ((data->notimpl & (1ULL << opcode)) != 0);
}
static inline void
fsess_set_impl(struct mount *mp, int opcode)
{
struct fuse_data *data = fuse_get_mpdata(mp);
data->isimpl |= (1ULL << opcode);
}
static inline void
fsess_set_notimpl(struct mount *mp, int opcode)
{

17
sys/fs/fuse/fuse_kernel.h
View File

@ -102,6 +102,9 @@
* - add ctime and ctimensec to fuse_setattr_in
* - add FUSE_RENAME2 request
* - add FUSE_NO_OPEN_SUPPORT flag
*
* 7.24
* - add FUSE_LSEEK for SEEK_HOLE and SEEK_DATA support
*/
#ifndef _FUSE_FUSE_KERNEL_H
@ -117,7 +120,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 23
#define FUSE_KERNEL_MINOR_VERSION 24
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -340,6 +343,7 @@ enum fuse_opcode {
FUSE_FALLOCATE = 43,
FUSE_READDIRPLUS = 44,
FUSE_RENAME2 = 45,
FUSE_LSEEK = 46,
#ifdef linux
/* CUSE specific operations */
@ -751,4 +755,15 @@ struct fuse_notify_retrieve_in {
uint64_t dummy4;
};
struct fuse_lseek_in {
uint64_t fh;
uint64_t offset;
uint32_t whence;
uint32_t padding;
};
struct fuse_lseek_out {
uint64_t offset;
};
#endif /* _FUSE_FUSE_KERNEL_H */

2
sys/fs/fuse/fuse_vfsops.c
View File

@ -501,7 +501,7 @@ fuse_vfsop_unmount(struct mount *mp, int mntflags)
if (fdata_get_dead(data)) {
goto alreadydead;
}
if (fsess_isimpl(mp, FUSE_DESTROY)) {
if (fsess_maybe_impl(mp, FUSE_DESTROY)) {
fdisp_init(&fdi, 0);
fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL);

141
sys/fs/fuse/fuse_vnops.c
View File

@ -69,6 +69,7 @@ __FBSDID("$FreeBSD$");
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/filio.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/queue.h>
@ -136,6 +137,7 @@ static vop_fsync_t fuse_vnop_fsync;
static vop_getattr_t fuse_vnop_getattr;
static vop_getextattr_t fuse_vnop_getextattr;
static vop_inactive_t fuse_vnop_inactive;
static vop_ioctl_t fuse_vnop_ioctl;
static vop_link_t fuse_vnop_link;
static vop_listextattr_t fuse_vnop_listextattr;
static vop_lookup_t fuse_vnop_lookup;
@ -190,11 +192,7 @@ struct vop_vector fuse_vnops = {
.vop_getattr = fuse_vnop_getattr,
.vop_getextattr = fuse_vnop_getextattr,
.vop_inactive = fuse_vnop_inactive,
/*
* TODO: implement vop_ioctl after upgrading to protocol 7.16.
* FUSE_IOCTL was added in 7.11, but 32-bit compat is broken until
* 7.16.
*/
.vop_ioctl = fuse_vnop_ioctl,
.vop_link = fuse_vnop_link,
.vop_listextattr = fuse_vnop_listextattr,
.vop_lookup = fuse_vnop_lookup,
@ -284,7 +282,7 @@ fuse_flush(struct vnode *vp, struct ucred *cred, pid_t pid, int fflag)
struct mount *mp = vnode_mount(vp);
int err;
if (!fsess_isimpl(vnode_mount(vp), FUSE_FLUSH))
if (fsess_not_impl(vnode_mount(vp), FUSE_FLUSH))
return 0;
err = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid);
@ -318,6 +316,42 @@ fuse_fifo_close(struct vop_close_args *ap)
return (fifo_specops.vop_close(ap));
}
/* Send FUSE_LSEEK for this node */
static int
fuse_vnop_do_lseek(struct vnode *vp, struct thread *td, struct ucred *cred,
pid_t pid, off_t *offp, int whence)
{
struct fuse_dispatcher fdi;
struct fuse_filehandle *fufh;
struct fuse_lseek_in *flsi;
struct fuse_lseek_out *flso;
struct mount *mp = vnode_mount(vp);
int err;
MPASS(VOP_ISLOCKED(vp));
err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid);
if (err)
return (err);
fdisp_init(&fdi, sizeof(*flsi));
fdisp_make_vp(&fdi, FUSE_LSEEK, vp, td, cred);
flsi = fdi.indata;
flsi->fh = fufh->fh_id;
flsi->offset = *offp;
flsi->whence = whence;
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_LSEEK);
} else if (err == 0) {
fsess_set_impl(mp, FUSE_LSEEK);
flso = fdi.answ;
*offp = flso->offset;
}
fdisp_destroy(&fdi);
return (err);
}
/*
struct vnop_access_args {
struct vnode *a_vp;
@ -516,7 +550,7 @@ fuse_vnop_bmap(struct vop_bmap_args *ap)
*runp = 0;
}
if (fsess_isimpl(mp, FUSE_BMAP)) {
if (fsess_maybe_impl(mp, FUSE_BMAP)) {
fdisp_init(&fdi, sizeof(*fbi));
fdisp_make_vp(&fdi, FUSE_BMAP, vp, td, td->td_ucred);
fbi = fdi.indata;
@ -652,7 +686,7 @@ fuse_vnop_create(struct vop_create_args *ap)
if (vap->va_type != VREG)
return (EINVAL);
if (!fsess_isimpl(mp, FUSE_CREATE) || vap->va_type == VSOCK) {
if (fsess_not_impl(mp, FUSE_CREATE) || vap->va_type == VSOCK) {
/* Fallback to FUSE_MKNOD/FUSE_OPEN */
fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td,
cred, mode, &op);
@ -883,6 +917,56 @@ fuse_vnop_inactive(struct vop_inactive_args *ap)
return 0;
}
/*
struct vnop_ioctl_args {
struct vnode *a_vp;
u_long a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_ioctl(struct vop_ioctl_args *ap)
{
struct vnode *vp = ap->a_vp;
struct mount *mp = vnode_mount(vp);
struct ucred *cred = ap->a_cred;
off_t *offp;
pid_t pid = ap->a_td->td_proc->p_pid;
int err;
switch (ap->a_command) {
case FIOSEEKDATA:
case FIOSEEKHOLE:
/* Call FUSE_LSEEK, if we can, or fall back to vop_stdioctl */
if (fsess_maybe_impl(mp, FUSE_LSEEK)) {
int whence;
offp = ap->a_data;
if (ap->a_command == FIOSEEKDATA)
whence = SEEK_DATA;
else
whence = SEEK_HOLE;
vn_lock(vp, LK_SHARED | LK_RETRY);
err = fuse_vnop_do_lseek(vp, ap->a_td, cred, pid, offp,
whence);
VOP_UNLOCK(vp);
}
if (fsess_not_impl(mp, FUSE_LSEEK))
err = vop_stdioctl(ap);
break;
default:
/* TODO: implement FUSE_IOCTL */
err = ENOTTY;
break;
}
return (err);
}
/*
struct vnop_link_args {
struct vnode *a_tdvp;
@ -1337,6 +1421,8 @@ fuse_vnop_open(struct vop_open_args *ap)
static int
fuse_vnop_pathconf(struct vop_pathconf_args *ap)
{
struct vnode *vp = ap->a_vp;
struct mount *mp;
switch (ap->a_name) {
case _PC_FILESIZEBITS:
@ -1354,6 +1440,35 @@ fuse_vnop_pathconf(struct vop_pathconf_args *ap)
case _PC_NO_TRUNC:
*ap->a_retval = 1;
return (0);
case _PC_MIN_HOLE_SIZE:
/*
* The FUSE protocol provides no mechanism for a server to
* report _PC_MIN_HOLE_SIZE. It's a protocol bug. Instead,
* return EINVAL if the server does not support FUSE_LSEEK, or
* 1 if it does.
*/
mp = vnode_mount(vp);
if (!fsess_is_impl(mp, FUSE_LSEEK) &&
!fsess_not_impl(mp, FUSE_LSEEK)) {
off_t offset = 0;
/* Issue a FUSE_LSEEK to find out if it's implemented */
fuse_vnop_do_lseek(vp, curthread, curthread->td_ucred,
curthread->td_proc->p_pid, &offset, SEEK_DATA);
}
if (fsess_is_impl(mp, FUSE_LSEEK)) {
*ap->a_retval = 1;
return (0);
} else {
/*
* Probably FUSE_LSEEK is not implemented. It might
* be, if the FUSE_LSEEK above returned an error like
* EACCES, but in that case we can't tell, so it's
* safest to report EINVAL anyway.
*/
return (EINVAL);
}
default:
return (vop_stdpathconf(ap));
}
@ -2035,7 +2150,7 @@ fuse_vnop_getextattr(struct vop_getextattr_args *ap)
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_GETXATTR))
if (fsess_not_impl(mp, FUSE_GETXATTR))
return EOPNOTSUPP;
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
@ -2121,7 +2236,7 @@ fuse_vnop_setextattr(struct vop_setextattr_args *ap)
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_SETXATTR))
if (fsess_not_impl(mp, FUSE_SETXATTR))
return EOPNOTSUPP;
if (vfs_isrdonly(mp))
@ -2133,7 +2248,7 @@ fuse_vnop_setextattr(struct vop_setextattr_args *ap)
* If we got here as fallback from VOP_DELETEEXTATTR, then
* return EOPNOTSUPP.
*/
if (!fsess_isimpl(mp, FUSE_REMOVEXATTR))
if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
return (EOPNOTSUPP);
else
return (EINVAL);
@ -2286,7 +2401,7 @@ fuse_vnop_listextattr(struct vop_listextattr_args *ap)
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_LISTXATTR))
if (fsess_not_impl(mp, FUSE_LISTXATTR))
return EOPNOTSUPP;
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
@ -2409,7 +2524,7 @@ fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap)
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_REMOVEXATTR))
if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
return EOPNOTSUPP;
if (vfs_isrdonly(mp))

1
tests/sys/fs/fusefs/Makefile
View File

@ -29,6 +29,7 @@ GTESTS+= io
GTESTS+= link
GTESTS+= locks
GTESTS+= lookup
GTESTS+= lseek
GTESTS+= mkdir
GTESTS+= mknod
GTESTS+= mount

360
tests/sys/fs/fusefs/lseek.cc Normal file
View File

@ -0,0 +1,360 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Alan Somers
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
extern "C" {
#include <sys/param.h>
#include <fcntl.h>
}
#include "mockfs.hh"
#include "utils.hh"
using namespace testing;
class Lseek: public FuseTest {};
class LseekPathconf: public Lseek {};
class LseekPathconf_7_23: public LseekPathconf {
public:
virtual void SetUp() {
m_kernel_minor_version = 23;
FuseTest::SetUp();
}
};
class LseekSeekHole: public Lseek {};
class LseekSeekData: public Lseek {};
/*
* If a previous lseek operation has already returned enosys, then pathconf can
* return EINVAL immediately.
*/
TEST_F(LseekPathconf, already_enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_in = 1 << 28;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(ENOSYS)));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(offset_in, lseek(fd, offset_in, SEEK_DATA));
EXPECT_EQ(-1, fpathconf(fd, _PC_MIN_HOLE_SIZE));
EXPECT_EQ(EINVAL, errno);
}
/*
* If a previous lseek operation has already returned successfully, then
* pathconf can return 1 immediately. 1 means "holes are reported, but size is
* not specified".
*/
TEST_F(LseekPathconf, already_seeked)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset = 1 << 28;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i, auto& out) {
SET_OUT_HEADER_LEN(out, lseek);
out.body.lseek.offset = i.body.lseek.offset;
})));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(offset, lseek(fd, offset, SEEK_DATA));
EXPECT_EQ(1, fpathconf(fd, _PC_MIN_HOLE_SIZE));
}
/*
* If no FUSE_LSEEK operation has been attempted since mount, try once as soon
* as a pathconf request comes in.
*/
TEST_F(LseekPathconf, enosys_now)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(ENOSYS)));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(-1, fpathconf(fd, _PC_MIN_HOLE_SIZE));
EXPECT_EQ(EINVAL, errno);
}
/*
* If no FUSE_LSEEK operation has been attempted since mount, try one as soon
* as a pathconf request comes in. This is the typical pattern of bsdtar. It
* will only try SEEK_HOLE/SEEK_DATA if fpathconf says they're supported.
*/
TEST_F(LseekPathconf, seek_now)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_initial = 1 << 27;
off_t offset_out = 1 << 29;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
SET_OUT_HEADER_LEN(out, lseek);
out.body.lseek.offset = offset_out;
})));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(offset_initial, lseek(fd, offset_initial, SEEK_SET));
EXPECT_EQ(1, fpathconf(fd, _PC_MIN_HOLE_SIZE));
/* And check that the file pointer hasn't changed */
EXPECT_EQ(offset_initial, lseek(fd, 0, SEEK_CUR));
}
/*
* For servers using older protocol versions, no FUSE_LSEEK should be attempted
*/
TEST_F(LseekPathconf_7_23, already_enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK);
}, Eq(true)),
_)
).Times(0);
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(-1, fpathconf(fd, _PC_MIN_HOLE_SIZE));
EXPECT_EQ(EINVAL, errno);
}
TEST_F(LseekSeekData, ok)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_in = 1 << 28;
off_t offset_out = 1 << 29;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK &&
in.header.nodeid == ino &&
in.body.lseek.fh == FH &&
(off_t)in.body.lseek.offset == offset_in &&
in.body.lseek.whence == SEEK_DATA);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
SET_OUT_HEADER_LEN(out, lseek);
out.body.lseek.offset = offset_out;
})));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(offset_out, lseek(fd, offset_in, SEEK_DATA));
EXPECT_EQ(offset_out, lseek(fd, 0, SEEK_CUR));
}
/*
* If the server returns ENOSYS, fusefs should fall back to the default
* behavior, and never query the server again.
*/
TEST_F(LseekSeekData, enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_in = 1 << 28;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK &&
in.header.nodeid == ino &&
in.body.lseek.fh == FH &&
(off_t)in.body.lseek.offset == offset_in &&
in.body.lseek.whence == SEEK_DATA);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(ENOSYS)));
fd = open(FULLPATH, O_RDONLY);
/*
* Default behavior: ENXIO if offset is < 0 or >= fsize, offset
* otherwise.
*/
EXPECT_EQ(offset_in, lseek(fd, offset_in, SEEK_DATA));
EXPECT_EQ(-1, lseek(fd, -1, SEEK_HOLE));
EXPECT_EQ(ENXIO, errno);
EXPECT_EQ(-1, lseek(fd, fsize, SEEK_HOLE));
EXPECT_EQ(ENXIO, errno);
}
TEST_F(LseekSeekHole, ok)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_in = 1 << 28;
off_t offset_out = 1 << 29;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK &&
in.header.nodeid == ino &&
in.body.lseek.fh == FH &&
(off_t)in.body.lseek.offset == offset_in &&
in.body.lseek.whence == SEEK_HOLE);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
SET_OUT_HEADER_LEN(out, lseek);
out.body.lseek.offset = offset_out;
})));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(offset_out, lseek(fd, offset_in, SEEK_HOLE));
EXPECT_EQ(offset_out, lseek(fd, 0, SEEK_CUR));
}
/*
* If the server returns ENOSYS, fusefs should fall back to the default
* behavior, and never query the server again.
*/
TEST_F(LseekSeekHole, enosys)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_in = 1 << 28;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK &&
in.header.nodeid == ino &&
in.body.lseek.fh == FH &&
(off_t)in.body.lseek.offset == offset_in &&
in.body.lseek.whence == SEEK_HOLE);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(ENOSYS)));
fd = open(FULLPATH, O_RDONLY);
/*
* Default behavior: ENXIO if offset is < 0 or >= fsize, fsize
* otherwise.
*/
EXPECT_EQ(fsize, lseek(fd, offset_in, SEEK_HOLE));
EXPECT_EQ(-1, lseek(fd, -1, SEEK_HOLE));
EXPECT_EQ(ENXIO, errno);
EXPECT_EQ(-1, lseek(fd, fsize, SEEK_HOLE));
EXPECT_EQ(ENXIO, errno);
}
/* lseek should return ENXIO when offset points to EOF */
TEST_F(LseekSeekHole, enxio)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
const uint64_t ino = 42;
off_t fsize = 1 << 30; /* 1 GiB */
off_t offset_in = fsize;
int fd;
expect_lookup(RELPATH, ino, S_IFREG | 0644, fsize, 1);
expect_open(ino, 0, 1);
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
return (in.header.opcode == FUSE_LSEEK &&
in.header.nodeid == ino &&
in.body.lseek.fh == FH &&
(off_t)in.body.lseek.offset == offset_in &&
in.body.lseek.whence == SEEK_HOLE);
}, Eq(true)),
_)
).WillOnce(Invoke(ReturnErrno(ENXIO)));
fd = open(FULLPATH, O_RDONLY);
EXPECT_EQ(-1, lseek(fd, offset_in, SEEK_HOLE));
EXPECT_EQ(ENXIO, errno);
}

35
tests/sys/fs/fusefs/mockfs.cc
View File

@ -62,8 +62,7 @@ int verbosity = 0;
const char* opcode2opname(uint32_t opcode)
{
const int NUM_OPS = 39;
const char* table[NUM_OPS] = {
const char* table[] = {
"Unknown (opcode 0)",
"LOOKUP",
"FORGET",
@ -102,9 +101,17 @@ const char* opcode2opname(uint32_t opcode)
"CREATE",
"INTERRUPT",
"BMAP",
"DESTROY"
"DESTROY",
"IOCTL",
"POLL",
"NOTIFY_REPLY",
"BATCH_FORGET",
"FALLOCATE",
"READDIRPLUS",
"RENAME2",
"LSEEK",
};
if (opcode >= NUM_OPS)
if (opcode >= nitems(table))
return ("Unknown (opcode > max)");
else
return (table[opcode]);
@ -211,6 +218,22 @@ void MockFS::debug_request(const mockfs_buf_in &in, ssize_t buflen)
case FUSE_LOOKUP:
printf(" %s", in.body.lookup);
break;
case FUSE_LSEEK:
switch (in.body.lseek.whence) {
case SEEK_HOLE:
printf(" SEEK_HOLE offset=%ld",
in.body.lseek.offset);
break;
case SEEK_DATA:
printf(" SEEK_DATA offset=%ld",
in.body.lseek.offset);
break;
default:
printf(" whence=%u offset=%ld",
in.body.lseek.whence, in.body.lseek.offset);
break;
}
break;
case FUSE_MKDIR:
name = (const char*)in.body.bytes +
sizeof(fuse_mkdir_in);
@ -636,6 +659,10 @@ void MockFS::audit_request(const mockfs_buf_in &in, ssize_t buflen) {
EXPECT_EQ(inlen, fih + sizeof(in.body.bmap));
EXPECT_EQ((size_t)buflen, inlen);
break;
case FUSE_LSEEK:
EXPECT_EQ(inlen, fih + sizeof(in.body.lseek));
EXPECT_EQ((size_t)buflen, inlen);
break;
case FUSE_NOTIFY_REPLY:
case FUSE_BATCH_FORGET:
case FUSE_FALLOCATE:

2
tests/sys/fs/fusefs/mockfs.hh
View File

@ -170,6 +170,7 @@ union fuse_payloads_in {
fuse_link_in link;
fuse_listxattr_in listxattr;
char lookup[0];
fuse_lseek_in lseek;
fuse_mkdir_in mkdir;
fuse_mknod_in mknod;
fuse_open_in open;
@ -210,6 +211,7 @@ union fuse_payloads_out {
fuse_getxattr_out getxattr;
fuse_init_out init;
fuse_init_out_7_22 init_7_22;
fuse_lseek_out lseek;
/* The inval_entry structure should be followed by the entry's name */
fuse_notify_inval_entry_out inval_entry;
fuse_notify_inval_inode_out inval_inode;