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Differential D20940 Diff 59883 sys/fs/fuse/fuse_vfsops.c

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sys/fs/fuse/fuse_vfsops.c

Show All 27 Lines
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* *
* Copyright (C) 2005 Csaba Henk. * Copyright (C) 2005 Csaba Henk.
* All rights reserved. * All rights reserved.
* *
* Copyright (c) 2019 The FreeBSD Foundation
*
* Portions of this software were developed by BFF Storage Systems, LLC under
* sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions * modification, are permitted provided that the following conditions
* are met: * are met:
* 1. Redistributions of source code must retain the above copyright * 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. * notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright * 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the * notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution. * documentation and/or other materials provided with the distribution.
Show All 32 Lines
#include <sys/proc.h> #include <sys/proc.h>
#include <sys/vnode.h> #include <sys/vnode.h>
#include <sys/namei.h> #include <sys/namei.h>
#include <sys/mount.h> #include <sys/mount.h>
#include <sys/sysctl.h> #include <sys/sysctl.h>
#include <sys/fcntl.h> #include <sys/fcntl.h>
#include "fuse.h" #include "fuse.h"
#include "fuse_param.h"
#include "fuse_node.h" #include "fuse_node.h"
#include "fuse_ipc.h" #include "fuse_ipc.h"
#include "fuse_internal.h" #include "fuse_internal.h"
#include <sys/priv.h> #include <sys/priv.h>
#include <security/mac/mac_framework.h> #include <security/mac/mac_framework.h>
SDT_PROVIDER_DECLARE(fuse); SDT_PROVIDER_DECLARE(fusefs);
/* /*
* Fuse trace probe: * Fuse trace probe:
* arg0: verbosity. Higher numbers give more verbose messages * arg0: verbosity. Higher numbers give more verbose messages
* arg1: Textual message * arg1: Textual message
*/ */
SDT_PROBE_DEFINE2(fuse, , vfsops, trace, "int", "char*"); SDT_PROBE_DEFINE2(fusefs, , vfsops, trace, "int", "char*");
/* This will do for privilege types for now */ /* This will do for privilege types for now */
#ifndef PRIV_VFS_FUSE_ALLOWOTHER #ifndef PRIV_VFS_FUSE_ALLOWOTHER
#define PRIV_VFS_FUSE_ALLOWOTHER PRIV_VFS_MOUNT_NONUSER #define PRIV_VFS_FUSE_ALLOWOTHER PRIV_VFS_MOUNT_NONUSER
#endif #endif
#ifndef PRIV_VFS_FUSE_MOUNT_NONUSER #ifndef PRIV_VFS_FUSE_MOUNT_NONUSER
#define PRIV_VFS_FUSE_MOUNT_NONUSER PRIV_VFS_MOUNT_NONUSER #define PRIV_VFS_FUSE_MOUNT_NONUSER PRIV_VFS_MOUNT_NONUSER
#endif #endif
#ifndef PRIV_VFS_FUSE_SYNC_UNMOUNT #ifndef PRIV_VFS_FUSE_SYNC_UNMOUNT
#define PRIV_VFS_FUSE_SYNC_UNMOUNT PRIV_VFS_MOUNT_NONUSER #define PRIV_VFS_FUSE_SYNC_UNMOUNT PRIV_VFS_MOUNT_NONUSER
#endif #endif
static vfs_fhtovp_t fuse_vfsop_fhtovp;
static vfs_mount_t fuse_vfsop_mount; static vfs_mount_t fuse_vfsop_mount;
static vfs_unmount_t fuse_vfsop_unmount; static vfs_unmount_t fuse_vfsop_unmount;
static vfs_root_t fuse_vfsop_root; static vfs_root_t fuse_vfsop_root;
static vfs_statfs_t fuse_vfsop_statfs; static vfs_statfs_t fuse_vfsop_statfs;
static vfs_vget_t fuse_vfsop_vget;
struct vfsops fuse_vfsops = { struct vfsops fuse_vfsops = {
.vfs_fhtovp = fuse_vfsop_fhtovp,
.vfs_mount = fuse_vfsop_mount, .vfs_mount = fuse_vfsop_mount,
.vfs_unmount = fuse_vfsop_unmount, .vfs_unmount = fuse_vfsop_unmount,
.vfs_root = fuse_vfsop_root, .vfs_root = fuse_vfsop_root,
.vfs_statfs = fuse_vfsop_statfs, .vfs_statfs = fuse_vfsop_statfs,
.vfs_vget = fuse_vfsop_vget,
}; };
SYSCTL_INT(_vfs_fusefs, OID_AUTO, init_backgrounded, CTLFLAG_RD,
SYSCTL_NULL_INT_PTR, 1, "indicate async handshake");
static int fuse_enforce_dev_perms = 0; static int fuse_enforce_dev_perms = 0;
SYSCTL_INT(_vfs_fusefs, OID_AUTO, enforce_dev_perms, CTLFLAG_RW, SYSCTL_INT(_vfs_fusefs, OID_AUTO, enforce_dev_perms, CTLFLAG_RW,
&fuse_enforce_dev_perms, 0, &fuse_enforce_dev_perms, 0,
"enforce fuse device permissions for secondary mounts"); "enforce fuse device permissions for secondary mounts");
static unsigned sync_unmount = 1;
SYSCTL_UINT(_vfs_fusefs, OID_AUTO, sync_unmount, CTLFLAG_RW,
&sync_unmount, 0, "specify when to use synchronous unmount");
MALLOC_DEFINE(M_FUSEVFS, "fuse_filesystem", "buffer for fuse vfs layer"); MALLOC_DEFINE(M_FUSEVFS, "fuse_filesystem", "buffer for fuse vfs layer");
static int static int
fuse_getdevice(const char *fspec, struct thread *td, struct cdev **fdevp) fuse_getdevice(const char *fspec, struct thread *td, struct cdev **fdevp)
{ {
struct nameidata nd, *ndp = &nd; struct nameidata nd, *ndp = &nd;
struct vnode *devvp; struct vnode *devvp;
struct cdev *fdev; struct cdev *fdev;
▲ Show 20 Lines • Show All 60 Lines • ▼ Show 20 Lines#endif /* 0 */
return 0; return 0;
} }
#define FUSE_FLAGOPT(fnam, fval) do { \ #define FUSE_FLAGOPT(fnam, fval) do { \
vfs_flagopt(opts, #fnam, &mntopts, fval); \ vfs_flagopt(opts, #fnam, &mntopts, fval); \
vfs_flagopt(opts, "__" #fnam, &__mntopts, fval); \ vfs_flagopt(opts, "__" #fnam, &__mntopts, fval); \
} while (0) } while (0)
SDT_PROBE_DEFINE1(fuse, , vfsops, mntopts, "uint64_t"); SDT_PROBE_DEFINE1(fusefs, , vfsops, mntopts, "uint64_t");
SDT_PROBE_DEFINE4(fuse, , vfsops, mount_err, "char*", "struct fuse_data*", SDT_PROBE_DEFINE4(fusefs, , vfsops, mount_err, "char*", "struct fuse_data*",
"struct mount*", "int"); "struct mount*", "int");
static int static int
fuse_vfs_remount(struct mount *mp, struct thread *td, uint64_t mntopts,
uint32_t max_read, int daemon_timeout)
{
int err = 0;
struct fuse_data *data = fuse_get_mpdata(mp);
/* Don't allow these options to be changed */
const static unsigned long long cant_update_opts =
MNT_USER; /* Mount owner must be the user running the daemon */
FUSE_LOCK();
if ((mp->mnt_flag ^ data->mnt_flag) & cant_update_opts) {
err = EOPNOTSUPP;
SDT_PROBE4(fusefs, , vfsops, mount_err,
"Can't change these mount options during remount",
data, mp, err);
goto out;
}
if (((data->dataflags ^ mntopts) & FSESS_MNTOPTS_MASK) ||
(data->max_read != max_read) ||
(data->daemon_timeout != daemon_timeout)) {
// TODO: allow changing options where it makes sense
err = EOPNOTSUPP;
SDT_PROBE4(fusefs, , vfsops, mount_err,
"Can't change fuse mount options during remount",
data, mp, err);
goto out;
}
if (fdata_get_dead(data)) {
err = ENOTCONN;
SDT_PROBE4(fusefs, , vfsops, mount_err,
"device is dead during mount", data, mp, err);
goto out;
}
/* Sanity + permission checks */
if (!data->daemoncred)
panic("fuse daemon found, but identity unknown");
if (mntopts & FSESS_DAEMON_CAN_SPY)
err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid)
/* are we allowed to do the first mount? */
err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
out:
FUSE_UNLOCK();
return err;
}
static int
fuse_vfsop_fhtovp(struct mount *mp, struct fid *fhp, int flags,
struct vnode **vpp)
{
struct fuse_fid *ffhp = (struct fuse_fid *)fhp;
struct fuse_vnode_data *fvdat;
struct vnode *nvp;
int error;
if (!(fuse_get_mpdata(mp)->dataflags & FSESS_EXPORT_SUPPORT))
return EOPNOTSUPP;
error = VFS_VGET(mp, ffhp->nid, LK_EXCLUSIVE, &nvp);
if (error) {
*vpp = NULLVP;
return (error);
}
fvdat = VTOFUD(nvp);
if (fvdat->generation != ffhp->gen ) {
vput(nvp);
*vpp = NULLVP;
return (ESTALE);
}
*vpp = nvp;
vnode_create_vobject(*vpp, 0, curthread);
return (0);
}
static int
fuse_vfsop_mount(struct mount *mp) fuse_vfsop_mount(struct mount *mp)
{ {
int err; int err;
uint64_t mntopts, __mntopts; uint64_t mntopts, __mntopts;
uint32_t max_read; uint32_t max_read;
int daemon_timeout; int daemon_timeout;
int fd; int fd;
Show All 9 Linesfuse_vfsop_mount(struct mount *mp)
subtype = NULL; subtype = NULL;
max_read = ~0; max_read = ~0;
err = 0; err = 0;
mntopts = 0; mntopts = 0;
__mntopts = 0; __mntopts = 0;
td = curthread; td = curthread;
if (mp->mnt_flag & MNT_UPDATE)
return EOPNOTSUPP;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_SYNCHRONOUS;
mp->mnt_data = NULL;
MNT_IUNLOCK(mp);
/* Get the new options passed to mount */ /* Get the new options passed to mount */
opts = mp->mnt_optnew; opts = mp->mnt_optnew;
if (!opts) if (!opts)
return EINVAL; return EINVAL;
/* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */ /* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */
if (!vfs_getopts(opts, "fspath", &err)) if (!vfs_getopts(opts, "fspath", &err))
return err; return err;
/* `from' contains the device name (eg. /dev/fuse0); REQUIRED */
fspec = vfs_getopts(opts, "from", &err);
if (!fspec)
return err;
/* `fd' contains the filedescriptor for this session; REQUIRED */
if (vfs_scanopt(opts, "fd", "%d", &fd) != 1)
return EINVAL;
err = fuse_getdevice(fspec, td, &fdev);
if (err != 0)
return err;
/* /*
* With the help of underscored options the mount program * With the help of underscored options the mount program
* can inform us from the flags it sets by default * can inform us from the flags it sets by default
*/ */
FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY); FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY);
FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN); FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN);
FUSE_FLAGOPT(default_permissions, FSESS_DEFAULT_PERMISSIONS); FUSE_FLAGOPT(default_permissions, FSESS_DEFAULT_PERMISSIONS);
FUSE_FLAGOPT(no_attrcache, FSESS_NO_ATTRCACHE);
FUSE_FLAGOPT(no_readahed, FSESS_NO_READAHEAD);
FUSE_FLAGOPT(no_datacache, FSESS_NO_DATACACHE);
FUSE_FLAGOPT(no_namecache, FSESS_NO_NAMECACHE);
FUSE_FLAGOPT(no_mmap, FSESS_NO_MMAP);
FUSE_FLAGOPT(brokenio, FSESS_BROKENIO);
(void)vfs_scanopt(opts, "max_read=", "%u", &max_read); (void)vfs_scanopt(opts, "max_read=", "%u", &max_read);
if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) { if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) {
if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT) if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)
daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT; daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT;
else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT) else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT)
daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT; daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT;
} else { } else {
daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT; daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
} }
subtype = vfs_getopts(opts, "subtype=", &err); subtype = vfs_getopts(opts, "subtype=", &err);
SDT_PROBE1(fuse, , vfsops, mntopts, mntopts); SDT_PROBE1(fusefs, , vfsops, mntopts, mntopts);
if (mp->mnt_flag & MNT_UPDATE) {
return fuse_vfs_remount(mp, td, mntopts, max_read,
daemon_timeout);
}
/* `from' contains the device name (eg. /dev/fuse0); REQUIRED */
fspec = vfs_getopts(opts, "from", &err);
if (!fspec)
return err;
/* `fd' contains the filedescriptor for this session; REQUIRED */
if (vfs_scanopt(opts, "fd", "%d", &fd) != 1)
return EINVAL;
err = fuse_getdevice(fspec, td, &fdev);
if (err != 0)
return err;
err = fget(td, fd, &cap_read_rights, &fp); err = fget(td, fd, &cap_read_rights, &fp);
if (err != 0) { if (err != 0) {
SDT_PROBE2(fuse, , vfsops, trace, 1, SDT_PROBE2(fusefs, , vfsops, trace, 1,
"invalid or not opened device"); "invalid or not opened device");
goto out; goto out;
} }
fptmp = td->td_fpop; fptmp = td->td_fpop;
td->td_fpop = fp; td->td_fpop = fp;
err = devfs_get_cdevpriv((void **)&data); err = devfs_get_cdevpriv((void **)&data);
td->td_fpop = fptmp; td->td_fpop = fptmp;
fdrop(fp, td); fdrop(fp, td);
FUSE_LOCK(); FUSE_LOCK();
if (err != 0 || data == NULL || data->mp != NULL) {
if (err != 0 || data == NULL) {
err = ENXIO; err = ENXIO;
SDT_PROBE4(fuse, , vfsops, mount_err, SDT_PROBE4(fusefs, , vfsops, mount_err,
"invalid or not opened device", data, mp, err); "invalid or not opened device", data, mp, err);
FUSE_UNLOCK(); FUSE_UNLOCK();
goto out; goto out;
} }
if (fdata_get_dead(data)) { if (fdata_get_dead(data)) {
err = ENOTCONN; err = ENOTCONN;
SDT_PROBE4(fuse, , vfsops, mount_err, SDT_PROBE4(fusefs, , vfsops, mount_err,
"device is dead during mount", data, mp, err); "device is dead during mount", data, mp, err);
FUSE_UNLOCK(); FUSE_UNLOCK();
goto out; goto out;
} }
/* Sanity + permission checks */ /* Sanity + permission checks */
if (!data->daemoncred) if (!data->daemoncred)
panic("fuse daemon found, but identity unknown"); panic("fuse daemon found, but identity unknown");
if (mntopts & FSESS_DAEMON_CAN_SPY) if (mntopts & FSESS_DAEMON_CAN_SPY)
err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER); err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid) if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid)
/* are we allowed to do the first mount? */ /* are we allowed to do the first mount? */
err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER); err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
if (err) { if (err) {
FUSE_UNLOCK(); FUSE_UNLOCK();
goto out; goto out;
} }
data->ref++; data->ref++;
data->mp = mp; data->mp = mp;
data->dataflags |= mntopts; data->dataflags |= mntopts;
data->max_read = max_read; data->max_read = max_read;
data->daemon_timeout = daemon_timeout; data->daemon_timeout = daemon_timeout;
data->mnt_flag = mp->mnt_flag & MNT_UPDATEMASK;
FUSE_UNLOCK(); FUSE_UNLOCK();
vfs_getnewfsid(mp); vfs_getnewfsid(mp);
MNT_ILOCK(mp); MNT_ILOCK(mp);
mp->mnt_data = data; mp->mnt_data = data;
mp->mnt_flag |= MNT_LOCAL; /*
* FUSE file systems can be either local or remote, but the kernel
* can't tell the difference.
*/
mp->mnt_flag &= ~MNT_LOCAL;
mp->mnt_kern_flag |= MNTK_USES_BCACHE; mp->mnt_kern_flag |= MNTK_USES_BCACHE;
MNT_IUNLOCK(mp); MNT_IUNLOCK(mp);
/* We need this here as this slot is used by getnewvnode() */ /* We need this here as this slot is used by getnewvnode() */
mp->mnt_stat.f_iosize = maxbcachebuf; mp->mnt_stat.f_iosize = maxbcachebuf;
if (subtype) { if (subtype) {
strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN); strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN);
strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN); strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN);
} }
copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &len); copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &len);
bzero(mp->mnt_stat.f_mntfromname + len, MNAMELEN - len); bzero(mp->mnt_stat.f_mntfromname + len, MNAMELEN - len);
mp->mnt_iosize_max = MAXPHYS;
/* Now handshaking with daemon */ /* Now handshaking with daemon */
fuse_internal_send_init(data, td); fuse_internal_send_init(data, td);
out: out:
if (err) { if (err) {
FUSE_LOCK(); FUSE_LOCK();
if (data != NULL && data->mp == mp) { if (data != NULL && data->mp == mp) {
/* /*
* Destroy device only if we acquired reference to * Destroy device only if we acquired reference to
* it * it
*/ */
SDT_PROBE4(fuse, , vfsops, mount_err, SDT_PROBE4(fusefs, , vfsops, mount_err,
"mount failed, destroy device", data, mp, err); "mount failed, destroy device", data, mp, err);
data->mp = NULL; data->mp = NULL;
mp->mnt_data = NULL;
fdata_trydestroy(data); fdata_trydestroy(data);
} }
FUSE_UNLOCK(); FUSE_UNLOCK();
dev_rel(fdev); dev_rel(fdev);
} }
return err; return err;
} }
Show All 27 Lines if (data->vroot != NULL) {
FUSE_UNLOCK(); FUSE_UNLOCK();
err = vflush(mp, 0, flags, td); err = vflush(mp, 0, flags, td);
if (err) { if (err) {
return err; return err;
} }
if (fdata_get_dead(data)) { if (fdata_get_dead(data)) {
goto alreadydead; goto alreadydead;
} }
if (fsess_isimpl(mp, FUSE_DESTROY)) {
fdisp_init(&fdi, 0); fdisp_init(&fdi, 0);
fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL); fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL);
err = fdisp_wait_answ(&fdi); (void)fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi); fdisp_destroy(&fdi);
}
fdata_set_dead(data); fdata_set_dead(data);
alreadydead: alreadydead:
FUSE_LOCK(); FUSE_LOCK();
data->mp = NULL; data->mp = NULL;
fdev = data->fdev; fdev = data->fdev;
fdata_trydestroy(data); fdata_trydestroy(data);
FUSE_UNLOCK(); FUSE_UNLOCK();
MNT_ILOCK(mp); MNT_ILOCK(mp);
mp->mnt_data = NULL; mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp); MNT_IUNLOCK(mp);
dev_rel(fdev); dev_rel(fdev);
return 0; return 0;
} }
SDT_PROBE_DEFINE1(fusefs, , vfsops, invalidate_without_export,
"struct mount*");
static int static int
fuse_vfsop_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
{
struct fuse_data *data = fuse_get_mpdata(mp);
uint64_t nodeid = ino;
struct thread *td = curthread;
struct fuse_dispatcher fdi;
struct fuse_entry_out *feo;
struct fuse_vnode_data *fvdat;
const char dot[] = ".";
off_t filesize;
enum vtype vtyp;
int error;
if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) {
/*
* Unreachable unless you do something stupid, like export a
* nullfs mount of a fusefs file system.
*/
SDT_PROBE1(fusefs, , vfsops, invalidate_without_export, mp);
return (EOPNOTSUPP);
}
error = fuse_internal_get_cached_vnode(mp, ino, flags, vpp);
if (error || *vpp != NULL)
return error;
/* Do a LOOKUP, using nodeid as the parent and "." as filename */
fdisp_init(&fdi, sizeof(dot));
fdisp_make(&fdi, FUSE_LOOKUP, mp, nodeid, td, td->td_ucred);
memcpy(fdi.indata, dot, sizeof(dot));
error = fdisp_wait_answ(&fdi);
if (error)
return error;
feo = (struct fuse_entry_out *)fdi.answ;
if (feo->nodeid == 0) {
/* zero nodeid means ENOENT and cache it */
error = ENOENT;
goto out;
}
vtyp = IFTOVT(feo->attr.mode);
error = fuse_vnode_get(mp, feo, nodeid, NULL, vpp, NULL, vtyp);
if (error)
goto out;
filesize = feo->attr.size;
/*
* In the case where we are looking up a FUSE node represented by an
* existing cached vnode, and the true size reported by FUSE_LOOKUP
* doesn't match the vnode's cached size, then any cached writes beyond
* the file's current size are lost.
*
* We can get here:
* * following attribute cache expiration, or
* * due a bug in the daemon, or
*/
fvdat = VTOFUD(*vpp);
if (vnode_isreg(*vpp) &&
filesize != fvdat->cached_attrs.va_size &&
fvdat->flag & FN_SIZECHANGE) {
printf("%s: WB cache incoherent on %s!\n", __func__,
vnode_mount(*vpp)->mnt_stat.f_mntonname);
fvdat->flag &= ~FN_SIZECHANGE;
}
fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
feo->attr_valid_nsec, NULL);
fuse_validity_2_bintime(feo->entry_valid, feo->entry_valid_nsec,
&fvdat->entry_cache_timeout);
out:
fdisp_destroy(&fdi);
return error;
}
static int
fuse_vfsop_root(struct mount *mp, int lkflags, struct vnode **vpp) fuse_vfsop_root(struct mount *mp, int lkflags, struct vnode **vpp)
{ {
struct fuse_data *data = fuse_get_mpdata(mp); struct fuse_data *data = fuse_get_mpdata(mp);
int err = 0; int err = 0;
if (data->vroot != NULL) { if (data->vroot != NULL) {
err = vget(data->vroot, lkflags, curthread); err = vget(data->vroot, lkflags, curthread);
if (err == 0) if (err == 0)
*vpp = data->vroot; *vpp = data->vroot;
} else { } else {
err = fuse_vnode_get(mp, NULL, FUSE_ROOT_ID, NULL, vpp, NULL, err = fuse_vnode_get(mp, NULL, FUSE_ROOT_ID, NULL, vpp, NULL,
VDIR); VDIR);
if (err == 0) { if (err == 0) {
FUSE_LOCK(); FUSE_LOCK();
MPASS(data->vroot == NULL || data->vroot == *vpp); MPASS(data->vroot == NULL || data->vroot == *vpp);
if (data->vroot == NULL) { if (data->vroot == NULL) {
SDT_PROBE2(fuse, , vfsops, trace, 1, SDT_PROBE2(fusefs, , vfsops, trace, 1,
"new root vnode"); "new root vnode");
data->vroot = *vpp; data->vroot = *vpp;
FUSE_UNLOCK(); FUSE_UNLOCK();
vref(*vpp); vref(*vpp);
} else if (data->vroot != *vpp) { } else if (data->vroot != *vpp) {
SDT_PROBE2(fuse, , vfsops, trace, 1, SDT_PROBE2(fusefs, , vfsops, trace, 1,
"root vnode race"); "root vnode race");
FUSE_UNLOCK(); FUSE_UNLOCK();
VOP_UNLOCK(*vpp, 0); VOP_UNLOCK(*vpp, 0);
vrele(*vpp); vrele(*vpp);
vrecycle(*vpp); vrecycle(*vpp);
*vpp = data->vroot; *vpp = data->vroot;
} else } else
FUSE_UNLOCK(); FUSE_UNLOCK();
▲ Show 20 Lines • Show All 46 Lines • ▼ Show 20 Lines
fake: fake:
sbp->f_blocks = 0; sbp->f_blocks = 0;
sbp->f_bfree = 0; sbp->f_bfree = 0;
sbp->f_bavail = 0; sbp->f_bavail = 0;
sbp->f_files = 0; sbp->f_files = 0;
sbp->f_ffree = 0; sbp->f_ffree = 0;
sbp->f_namemax = 0; sbp->f_namemax = 0;
sbp->f_bsize = FUSE_DEFAULT_BLOCKSIZE; sbp->f_bsize = S_BLKSIZE;
return 0; return 0;
} }