static errno_t
fuse_vfsop_root(mount_t mp, struct vnode **vpp, vfs_context_t context)
{
int err = 0;
vnode_t vp = NULLVP;
struct fuse_entry_out feo_root;
struct fuse_data *data = fuse_get_mpdata(mp);
fuse_trace_printf_vfsop();
if (data->rootvp != NULLVP) {
*vpp = data->rootvp;
return vnode_get(*vpp);
}
bzero(&feo_root, sizeof(feo_root));
feo_root.nodeid = FUSE_ROOT_ID;
feo_root.generation = 0;
feo_root.attr.ino = FUSE_ROOT_ID;
feo_root.attr.size = FUSE_ROOT_SIZE;
feo_root.attr.mode = VTTOIF(VDIR);
err = FSNodeGetOrCreateFileVNodeByID(&vp, FN_IS_ROOT, &feo_root, mp,
NULLVP /* dvp */, context,
NULL /* oflags */);
*vpp = vp;
if (!err) {
data->rootvp = *vpp;
}
return err;
}
static errno_t
fuse_vfsop_sync(mount_t mp, int waitfor, vfs_context_t context)
{
uint64_t mntflags;
struct fuse_sync_cargs args;
int allerror = 0;
fuse_trace_printf_vfsop();
mntflags = vfs_flags(mp);
if (fuse_isdeadfs_mp(mp)) {
return 0;
}
if (vfs_isupdate(mp)) {
return 0;
}
if (vfs_isrdonly(mp)) {
return EROFS; // should panic!?
}
/*
* Write back each (modified) fuse node.
*/
args.context = context;
args.waitfor = waitfor;
args.error = 0;
#if M_FUSE4X_ENABLE_BIGLOCK
struct fuse_data *data = fuse_get_mpdata(mp);
fuse_biglock_unlock(data->biglock);
#endif
vnode_iterate(mp, 0, fuse_sync_callback, (void *)&args);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_lock(data->biglock);
#endif
if (args.error) {
allerror = args.error;
}
/*
* For other types of stale file system information, such as:
*
* - fs control info
* - quota information
* - modified superblock
*/
return allerror;
}
static errno_t
fuse_vfsop_getattr(mount_t mp, struct vfs_attr *attr, vfs_context_t context)
{
int err = 0;
bool deading = false, faking = false;
struct fuse_dispatcher fdi;
struct fuse_statfs_out *fsfo;
struct fuse_statfs_out faked;
struct fuse_data *data;
fuse_trace_printf_vfsop();
data = fuse_get_mpdata(mp);
if (!data) {
panic("fuse4x: no private data for mount point?");
}
if (!(data->dataflags & FSESS_INITED)) {
// coreservices process requests ATTR_VOL_CAPABILITIES on the mountpoint right before
// returning from mount() syscall. We need to fake the output because daemon might
// not be ready to response yet (and deadlock will happen).
faking = true;
goto dostatfs;
}
fdisp_init(&fdi, 0);
fdisp_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, context);
if ((err = fdisp_wait_answ(&fdi))) {
// If we cannot communicate with the daemon (most likely because
// it's dead), we still want to portray that we are a bonafide
// file system so that we can be gracefully unmounted.
if (err == ENOTCONN) {
deading = faking = true;
goto dostatfs;
}
return err;
}
dostatfs:
if (faking) {
bzero(&faked, sizeof(faked));
fsfo = &faked;
} else {
fsfo = fdi.answ;
}
if (fsfo->st.bsize == 0) {
fsfo->st.bsize = FUSE_DEFAULT_IOSIZE;
}
if (fsfo->st.frsize == 0) {
fsfo->st.frsize = FUSE_DEFAULT_BLOCKSIZE;
}
/* optimal transfer block size; will go into f_iosize in the kernel */
fsfo->st.bsize = fuse_round_size(fsfo->st.bsize,
FUSE_MIN_IOSIZE, FUSE_MAX_IOSIZE);
/* file system fragment size; will go into f_bsize in the kernel */
fsfo->st.frsize = fuse_round_size(fsfo->st.frsize,
FUSE_MIN_BLOCKSIZE, FUSE_MAX_BLOCKSIZE);
/* We must have: f_iosize >= f_bsize (fsfo->st.bsize >= fsfo->st_frsize) */
if (fsfo->st.bsize < fsfo->st.frsize) {
fsfo->st.bsize = fsfo->st.frsize;
}
/*
* TBD: Possibility:
*
* For actual I/O to fuse4x's "virtual" storage device, we use
* data->blocksize and data->iosize. These are really meant to be
* constant across the lifetime of a single mount. If necessary, we
* can experiment by updating the mount point's stat with the frsize
* and bsize values we come across here.
*/
/*
* FUSE user daemon will (might) give us this:
*
* __u64 blocks; // total data blocks in the file system
* __u64 bfree; // free blocks in the file system
* __u64 bavail; // free blocks available to non-superuser
* __u64 files; // total file nodes in the file system
* __u64 ffree; // free file nodes in the file system
* __u32 bsize; // preferred/optimal file system block size
* __u32 namelen; // maximum length of filenames
* __u32 frsize; // fundamental file system block size
*
* On Mac OS X, we will map this data to struct vfs_attr as follows:
*
* Mac OS X FUSE
* -------- ----
* uint64_t f_supported <- // handled here
* uint64_t f_active <- // handled here
* uint64_t f_objcount <- -
* uint64_t f_filecount <- files
* uint64_t f_dircount <- -
* uint32_t f_bsize <- frsize
* size_t f_iosize <- bsize
* uint64_t f_blocks <- blocks
* uint64_t f_bfree <- bfree
* uint64_t f_bavail <- bavail
* uint64_t f_bused <- blocks - bfree
* uint64_t f_files <- files
* uint64_t f_ffree <- ffree
* fsid_t f_fsid <- // handled elsewhere
* uid_t f_owner <- // handled elsewhere
* ... capabilities <- // handled here
* ... attributes <- // handled here
* f_create_time <- -
* f_modify_time <- -
* f_access_time <- -
* f_backup_time <- -
* uint32_t f_fssubtype <- // daemon provides
* char *f_vol_name <- // handled here
* uint16_t f_signature <- // handled here
* uint16_t f_carbon_fsid <- // handled here
*/
VFSATTR_RETURN(attr, f_filecount, fsfo->st.files);
VFSATTR_RETURN(attr, f_bsize, fsfo->st.frsize);
VFSATTR_RETURN(attr, f_iosize, fsfo->st.bsize);
VFSATTR_RETURN(attr, f_blocks, fsfo->st.blocks);
VFSATTR_RETURN(attr, f_bfree, fsfo->st.bfree);
VFSATTR_RETURN(attr, f_bavail, fsfo->st.bavail);
VFSATTR_RETURN(attr, f_bused, (fsfo->st.blocks - fsfo->st.bfree));
VFSATTR_RETURN(attr, f_files, fsfo->st.files);
VFSATTR_RETURN(attr, f_ffree, fsfo->st.ffree);
/* f_fsid and f_owner handled elsewhere. */
/* Handle capabilities and attributes. */
handle_capabilities_and_attributes(mp, attr);
VFSATTR_RETURN(attr, f_create_time, kZeroTime);
VFSATTR_RETURN(attr, f_modify_time, kZeroTime);
VFSATTR_RETURN(attr, f_access_time, kZeroTime);
VFSATTR_RETURN(attr, f_backup_time, kZeroTime);
if (deading) {
VFSATTR_RETURN(attr, f_fssubtype, (uint32_t)FUSE_FSSUBTYPE_INVALID);
} else {
VFSATTR_RETURN(attr, f_fssubtype, data->fssubtype);
}
/* Daemon needs to pass this. */
if (VFSATTR_IS_ACTIVE(attr, f_vol_name)) {
if (data->volname[0] != 0) {
strncpy(attr->f_vol_name, data->volname, MAXPATHLEN);
attr->f_vol_name[MAXPATHLEN - 1] = 0;
VFSATTR_SET_SUPPORTED(attr, f_vol_name);
}
}
VFSATTR_RETURN(attr, f_signature, OSSwapBigToHostInt16(FUSEFS_SIGNATURE));
VFSATTR_RETURN(attr, f_carbon_fsid, 0);
if (!faking)
fuse_ticket_drop(fdi.tick);
return 0;
}
static errno_t
fuse_vfsop_unmount(mount_t mp, int mntflags, vfs_context_t context)
{
int err = 0;
int flags = 0;
fuse_device_t fdev;
struct fuse_data *data;
struct fuse_dispatcher fdi;
vnode_t fuse_rootvp = NULLVP;
fuse_trace_printf_vfsop();
if (mntflags & MNT_FORCE) {
flags |= FORCECLOSE;
}
data = fuse_get_mpdata(mp);
if (!data) {
panic("fuse4x: no mount private data in vfs_unmount");
}
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_lock(data->biglock);
#endif
fdev = data->fdev;
if (fdata_dead_get(data)) {
/*
* If the file system daemon is dead, it's pointless to try to do
* any unmount-time operations that go out to user space. Therefore,
* we pretend that this is a force unmount. However, this isn't of much
* use. That's because if any non-root vnode is in use, the vflush()
* that the kernel does before calling our VFS_UNMOUNT will fail
* if the original unmount wasn't forcible already. That earlier
* vflush is called with SKIPROOT though, so it wouldn't bail out
* on the root vnode being in use.
*
* If we want, we could set FORCECLOSE here so that a non-forced
* unmount will be "upgraded" to a forced unmount if the root vnode
* is busy (you are cd'd to the mount point, for example). It's not
* quite pure to do that though.
*
* flags |= FORCECLOSE;
* log("fuse4x: forcing unmount on a dead file system\n");
*/
} else if (!(data->dataflags & FSESS_INITED)) {
flags |= FORCECLOSE;
log("fuse4x: forcing unmount on not-yet-alive file system\n");
fdata_set_dead(data);
}
fuse_rootvp = data->rootvp;
fuse_trace_printf("%s: Calling vflush(mp, fuse_rootvp, flags=0x%X);\n", __FUNCTION__, flags);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(data->biglock);
#endif
err = vflush(mp, fuse_rootvp, flags);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_lock(data->biglock);
#endif
fuse_trace_printf("%s: Done.\n", __FUNCTION__);
if (err) {
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(data->biglock);
#endif
return err;
}
if (vnode_isinuse(fuse_rootvp, 1) && !(flags & FORCECLOSE)) {
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(data->biglock);
#endif
return EBUSY;
}
if (fdata_dead_get(data)) {
goto alreadydead;
}
fdisp_init(&fdi, 0 /* no data to send along */);
fdisp_make(&fdi, FUSE_DESTROY, mp, FUSE_ROOT_ID, context);
fuse_trace_printf("%s: Waiting for reply from FUSE_DESTROY.\n", __FUNCTION__);
err = fdisp_wait_answ(&fdi);
fuse_trace_printf("%s: Reply received.\n", __FUNCTION__);
if (!err) {
fuse_ticket_drop(fdi.tick);
}
/*
* Note that dounmount() signals a VQ_UNMOUNT VFS event.
*/
fdata_set_dead(data);
alreadydead:
fuse_trace_printf("%s: Calling vnode_rele(fuse_rootp);\n", __FUNCTION__);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(data->biglock);
#endif
vnode_rele(fuse_rootvp); /* We got this reference in fuse_vfsop_mount(). */
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_lock(data->biglock);
#endif
fuse_trace_printf("%s: Done.\n", __FUNCTION__);
data->rootvp = NULLVP;
fuse_trace_printf("%s: Calling vflush(mp, NULLVP, FORCECLOSE);\n", __FUNCTION__);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(data->biglock);
#endif
(void)vflush(mp, NULLVP, FORCECLOSE);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_lock(data->biglock);
#endif
fuse_trace_printf("%s: Done.\n", __FUNCTION__);
fuse_lck_mtx_lock(fdev->mtx);
vfs_setfsprivate(mp, NULL);
data->dataflags &= ~FSESS_MOUNTED;
OSAddAtomic(-1, (SInt32 *)&fuse_mount_count);
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(data->biglock);
#endif
if (!(data->dataflags & FSESS_OPENED)) {
/* fdev->data was left for us to clean up */
fuse_device_close_final(fdev);
/* fdev->data is gone now */
}
fuse_lck_mtx_unlock(fdev->mtx);
return 0;
}
static errno_t
fuse_vfsop_mount(mount_t mp, __unused vnode_t devvp, user_addr_t udata,
vfs_context_t context)
{
int err = 0;
int mntopts = 0;
bool mounted = false;
uint32_t max_read = ~0;
size_t len;
fuse_device_t fdev = NULL;
struct fuse_data *data = NULL;
fuse_mount_args fusefs_args;
struct vfsstatfs *vfsstatfsp = vfs_statfs(mp);
#if M_FUSE4X_ENABLE_BIGLOCK
lck_mtx_t *biglock;
#endif
fuse_trace_printf_vfsop();
if (vfs_isupdate(mp)) {
return ENOTSUP;
}
err = copyin(udata, &fusefs_args, sizeof(fusefs_args));
if (err) {
return EINVAL;
}
/*
* Interesting flags that we can receive from mount or may want to
* otherwise forcibly set include:
*
* MNT_ASYNC
* MNT_AUTOMOUNTED
* MNT_DEFWRITE
* MNT_DONTBROWSE
* MNT_IGNORE_OWNERSHIP
* MNT_JOURNALED
* MNT_NODEV
* MNT_NOEXEC
* MNT_NOSUID
* MNT_NOUSERXATTR
* MNT_RDONLY
* MNT_SYNCHRONOUS
* MNT_UNION
*/
err = ENOTSUP;
#if M_FUSE4X_ENABLE_UNSUPPORTED
vfs_setlocklocal(mp);
#endif /* M_FUSE4X_ENABLE_UNSUPPORTED */
/** Option Processing. **/
if (*fusefs_args.fstypename) {
size_t typenamelen = strlen(fusefs_args.fstypename);
if (typenamelen > FUSE_FSTYPENAME_MAXLEN) {
return EINVAL;
}
snprintf(vfsstatfsp->f_fstypename, MFSTYPENAMELEN, "%s%s",
FUSE_FSTYPENAME_PREFIX, fusefs_args.fstypename);
}
if (!*fusefs_args.fsname)
return EINVAL;
if ((fusefs_args.daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT) ||
(fusefs_args.daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)) {
return EINVAL;
}
if ((fusefs_args.init_timeout > FUSE_MAX_INIT_TIMEOUT) ||
(fusefs_args.init_timeout < FUSE_MIN_INIT_TIMEOUT)) {
return EINVAL;
}
if (fusefs_args.altflags & FUSE_MOPT_SPARSE) {
mntopts |= FSESS_SPARSE;
}
if (fusefs_args.altflags & FUSE_MOPT_AUTO_CACHE) {
mntopts |= FSESS_AUTO_CACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_AUTO_XATTR) {
if (fusefs_args.altflags & FUSE_MOPT_NATIVE_XATTR) {
return EINVAL;
}
mntopts |= FSESS_AUTO_XATTR;
} else if (fusefs_args.altflags & FUSE_MOPT_NATIVE_XATTR) {
mntopts |= FSESS_NATIVE_XATTR;
}
if (fusefs_args.altflags & FUSE_MOPT_JAIL_SYMLINKS) {
mntopts |= FSESS_JAIL_SYMLINKS;
}
/*
* Note that unlike Linux, which keeps allow_root in user-space and
* passes allow_other in that case to the kernel, we let allow_root
* reach the kernel. The 'if' ordering is important here.
*/
if (fusefs_args.altflags & FUSE_MOPT_ALLOW_ROOT) {
int is_member = 0;
if ((kauth_cred_ismember_gid(kauth_cred_get(), fuse_admin_group, &is_member) != 0) || !is_member) {
log("fuse4x: caller is not a member of fuse4x admin group. "
"Either add user (id=%d) to group (id=%d), "
"or set correct '" SYSCTL_FUSE4X_TUNABLES_ADMIN "' sysctl value.\n",
kauth_cred_getuid(kauth_cred_get()), fuse_admin_group);
return EPERM;
}
mntopts |= FSESS_ALLOW_ROOT;
} else if (fusefs_args.altflags & FUSE_MOPT_ALLOW_OTHER) {
if (!fuse_allow_other && !fuse_vfs_context_issuser(context)) {
int is_member = 0;
if ((kauth_cred_ismember_gid(kauth_cred_get(), fuse_admin_group, &is_member) != 0) || !is_member) {
log("fuse4x: caller is not a member of fuse4x admin group. "
"Either add user (id=%d) to group (id=%d), "
"or set correct '" SYSCTL_FUSE4X_TUNABLES_ADMIN "' sysctl value.\n",
kauth_cred_getuid(kauth_cred_get()), fuse_admin_group);
return EPERM;
}
}
mntopts |= FSESS_ALLOW_OTHER;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_APPLEDOUBLE) {
mntopts |= FSESS_NO_APPLEDOUBLE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_APPLEXATTR) {
mntopts |= FSESS_NO_APPLEXATTR;
}
if ((fusefs_args.altflags & FUSE_MOPT_FSID) && (fusefs_args.fsid != 0)) {
fsid_t fsid;
mount_t other_mp;
uint32_t target_dev;
target_dev = FUSE_MAKEDEV(FUSE_CUSTOM_FSID_DEVICE_MAJOR,
fusefs_args.fsid);
fsid.val[0] = target_dev;
fsid.val[1] = FUSE_CUSTOM_FSID_VAL1;
other_mp = vfs_getvfs(&fsid);
if (other_mp != NULL) {
return EPERM;
}
vfsstatfsp->f_fsid.val[0] = target_dev;
vfsstatfsp->f_fsid.val[1] = FUSE_CUSTOM_FSID_VAL1;
} else {
vfs_getnewfsid(mp);
}
if (fusefs_args.altflags & FUSE_MOPT_NO_ATTRCACHE) {
mntopts |= FSESS_NO_ATTRCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_READAHEAD) {
mntopts |= FSESS_NO_READAHEAD;
}
if (fusefs_args.altflags & (FUSE_MOPT_NO_UBC | FUSE_MOPT_DIRECT_IO)) {
mntopts |= FSESS_NO_UBC;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_VNCACHE) {
mntopts |= FSESS_NO_VNCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NEGATIVE_VNCACHE) {
if (mntopts & FSESS_NO_VNCACHE) {
return EINVAL;
}
mntopts |= FSESS_NEGATIVE_VNCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_SYNCWRITES) {
/* Cannot mix 'nosyncwrites' with 'noubc' or 'noreadahead'. */
if (mntopts & (FSESS_NO_READAHEAD | FSESS_NO_UBC)) {
log("fuse4x: cannot mix 'nosyncwrites' with 'noubc' or 'noreadahead'\n");
return EINVAL;
}
mntopts |= FSESS_NO_SYNCWRITES;
vfs_clearflags(mp, MNT_SYNCHRONOUS);
vfs_setflags(mp, MNT_ASYNC);
/* We check for this only if we have nosyncwrites in the first place. */
if (fusefs_args.altflags & FUSE_MOPT_NO_SYNCONCLOSE) {
mntopts |= FSESS_NO_SYNCONCLOSE;
}
} else {
vfs_clearflags(mp, MNT_ASYNC);
vfs_setflags(mp, MNT_SYNCHRONOUS);
}
if (mntopts & FSESS_NO_UBC) {
/* If no buffer cache, disallow exec from file system. */
vfs_setflags(mp, MNT_NOEXEC);
}
vfs_setauthopaque(mp);
vfs_setauthopaqueaccess(mp);
if ((fusefs_args.altflags & FUSE_MOPT_DEFAULT_PERMISSIONS) &&
(fusefs_args.altflags & FUSE_MOPT_DEFER_PERMISSIONS)) {
return EINVAL;
}
if (fusefs_args.altflags & FUSE_MOPT_DEFAULT_PERMISSIONS) {
mntopts |= FSESS_DEFAULT_PERMISSIONS;
vfs_clearauthopaque(mp);
}
if (fusefs_args.altflags & FUSE_MOPT_DEFER_PERMISSIONS) {
mntopts |= FSESS_DEFER_PERMISSIONS;
}
if (fusefs_args.altflags & FUSE_MOPT_EXTENDED_SECURITY) {
mntopts |= FSESS_EXTENDED_SECURITY;
vfs_setextendedsecurity(mp);
}
if (fusefs_args.altflags & FUSE_MOPT_LOCALVOL) {
vfs_setflags(mp, MNT_LOCAL);
}
/* done checking incoming option bits */
err = 0;
vfs_setfsprivate(mp, NULL);
fdev = fuse_device_get(fusefs_args.rdev);
if (!fdev) {
log("fuse4x: invalid device file (number=%d)\n", fusefs_args.rdev);
return EINVAL;
}
fuse_lck_mtx_lock(fdev->mtx);
data = fdev->data;
if (!data) {
fuse_lck_mtx_unlock(fdev->mtx);
return ENXIO;
}
#if M_FUSE4X_ENABLE_BIGLOCK
biglock = data->biglock;
fuse_biglock_lock(biglock);
#endif
if (data->dataflags & FSESS_MOUNTED) {
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_biglock_unlock(biglock);
#endif
fuse_lck_mtx_unlock(fdev->mtx);
return EALREADY;
}
if (!(data->dataflags & FSESS_OPENED)) {
fuse_lck_mtx_unlock(fdev->mtx);
err = ENXIO;
goto out;
}
data->dataflags |= FSESS_MOUNTED;
OSAddAtomic(1, (SInt32 *)&fuse_mount_count);
mounted = true;
if (fdata_dead_get(data)) {
fuse_lck_mtx_unlock(fdev->mtx);
err = ENOTCONN;
goto out;
}
if (!data->daemoncred) {
panic("fuse4x: daemon found but identity unknown");
}
if (fuse_vfs_context_issuser(context) &&
kauth_cred_getuid(vfs_context_ucred(context)) != kauth_cred_getuid(data->daemoncred)) {
fuse_lck_mtx_unlock(fdev->mtx);
err = EPERM;
log("fuse4x: fuse daemon running by user_id=%d does not have privileges to mount on directory %s owned by user_id=%d\n",
kauth_cred_getuid(data->daemoncred), vfsstatfsp->f_mntonname, kauth_cred_getuid(vfs_context_ucred(context)));
goto out;
}
data->mp = mp;
data->fdev = fdev;
data->dataflags |= mntopts;
data->daemon_timeout.tv_sec = fusefs_args.daemon_timeout;
data->daemon_timeout.tv_nsec = 0;
if (data->daemon_timeout.tv_sec) {
data->daemon_timeout_p = &(data->daemon_timeout);
} else {
data->daemon_timeout_p = NULL;
}
data->init_timeout.tv_sec = fusefs_args.init_timeout;
data->init_timeout.tv_nsec = 0;
data->max_read = max_read;
data->fssubtype = fusefs_args.fssubtype;
data->mountaltflags = fusefs_args.altflags;
data->noimplflags = (uint64_t)0;
data->blocksize = fuse_round_size(fusefs_args.blocksize,
FUSE_MIN_BLOCKSIZE, FUSE_MAX_BLOCKSIZE);
data->iosize = fuse_round_size(fusefs_args.iosize,
FUSE_MIN_IOSIZE, FUSE_MAX_IOSIZE);
if (data->iosize < data->blocksize) {
data->iosize = data->blocksize;
}
data->userkernel_bufsize = FUSE_DEFAULT_USERKERNEL_BUFSIZE;
copystr(fusefs_args.fsname, vfsstatfsp->f_mntfromname,
MNAMELEN - 1, &len);
bzero(vfsstatfsp->f_mntfromname + len, MNAMELEN - len);
copystr(fusefs_args.volname, data->volname, MAXPATHLEN - 1, &len);
bzero(data->volname + len, MAXPATHLEN - len);
/* previous location of vfs_setioattr() */
vfs_setfsprivate(mp, data);
fuse_lck_mtx_unlock(fdev->mtx);
/* Send a handshake message to the daemon. */
fuse_send_init(data, context);
struct vfs_attr vfs_attr;
VFSATTR_INIT(&vfs_attr);
// Our vfs_getattr() doesn't look at most *_IS_ACTIVE()'s
err = fuse_vfsop_getattr(mp, &vfs_attr, context);
if (!err) {
vfsstatfsp->f_bsize = vfs_attr.f_bsize;
vfsstatfsp->f_iosize = vfs_attr.f_iosize;
vfsstatfsp->f_blocks = vfs_attr.f_blocks;
vfsstatfsp->f_bfree = vfs_attr.f_bfree;
vfsstatfsp->f_bavail = vfs_attr.f_bavail;
vfsstatfsp->f_bused = vfs_attr.f_bused;
vfsstatfsp->f_files = vfs_attr.f_files;
vfsstatfsp->f_ffree = vfs_attr.f_ffree;
// vfsstatfsp->f_fsid already handled above
vfsstatfsp->f_owner = kauth_cred_getuid(data->daemoncred);
vfsstatfsp->f_flags = vfs_flags(mp);
// vfsstatfsp->f_fstypename already handled above
// vfsstatfsp->f_mntonname handled elsewhere
// vfsstatfsp->f_mnfromname already handled above
vfsstatfsp->f_fssubtype = data->fssubtype;
}
if (fusefs_args.altflags & FUSE_MOPT_BLOCKSIZE) {
vfsstatfsp->f_bsize = data->blocksize;
} else {
//data->blocksize = vfsstatfsp->f_bsize;
}
if (fusefs_args.altflags & FUSE_MOPT_IOSIZE) {
vfsstatfsp->f_iosize = data->iosize;
} else {
//data->iosize = (uint32_t)vfsstatfsp->f_iosize;
vfsstatfsp->f_iosize = data->iosize;
}
out:
if (err) {
vfs_setfsprivate(mp, NULL);
fuse_lck_mtx_lock(fdev->mtx);
data = fdev->data; /* again */
if (mounted) {
OSAddAtomic(-1, (SInt32 *)&fuse_mount_count);
}
if (data) {
data->dataflags &= ~FSESS_MOUNTED;
if (!(data->dataflags & FSESS_OPENED)) {
#if M_FUSE4X_ENABLE_BIGLOCK
assert(biglock == data->biglock);
fuse_biglock_unlock(biglock);
#endif
fuse_device_close_final(fdev);
/* data is gone now */
}
}
fuse_lck_mtx_unlock(fdev->mtx);
} else {
vnode_t fuse_rootvp = NULLVP;
err = fuse_vfsop_root(mp, &fuse_rootvp, context);
if (err) {
goto out; /* go back and follow error path */
}
err = vnode_ref(fuse_rootvp);
(void)vnode_put(fuse_rootvp);
if (err) {
goto out; /* go back and follow error path */
} else {
struct vfsioattr ioattr;
vfs_ioattr(mp, &ioattr);
ioattr.io_devblocksize = data->blocksize;
vfs_setioattr(mp, &ioattr);
}
}
#if M_FUSE4X_ENABLE_BIGLOCK
fuse_lck_mtx_lock(fdev->mtx);
data = fdev->data; /* ...and again */
if(data) {
assert(data->biglock == biglock);
fuse_biglock_unlock(biglock);
}
fuse_lck_mtx_unlock(fdev->mtx);
#endif
return err;
}
static errno_t
fuse_vfsop_setattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t context)
{
int error = 0;
fuse_trace_printf_vfsop();
kauth_cred_t cred = vfs_context_ucred(context);
if (!fuse_vfs_context_issuser(context) &&
(kauth_cred_getuid(cred) != vfs_statfs(mp)->f_owner)) {
return EACCES;
}
struct fuse_data *data = fuse_get_mpdata(mp);
if (VFSATTR_IS_ACTIVE(fsap, f_vol_name)) {
if (!fuse_implemented(data, FSESS_NOIMPLBIT(SETVOLNAME))) {
error = ENOTSUP;
goto out;
}
if (fsap->f_vol_name[0] == 0) {
error = EINVAL;
goto out;
}
size_t namelen = strlen(fsap->f_vol_name);
if (namelen >= MAXPATHLEN) {
error = ENAMETOOLONG;
goto out;
}
vnode_t root_vp;
error = fuse_vfsop_root(mp, &root_vp, context);
if (error) {
goto out;
}
struct fuse_dispatcher fdi;
fdisp_init(&fdi, namelen + 1);
fdisp_make_vp(&fdi, FUSE_SETVOLNAME, root_vp, context);
memcpy((char *)fdi.indata, fsap->f_vol_name, namelen);
((char *)fdi.indata)[namelen] = '\0';
if (!(error = fdisp_wait_answ(&fdi))) {
fuse_ticket_drop(fdi.tick);
}
(void)vnode_put(root_vp);
if (error) {
if (error == ENOSYS) {
error = ENOTSUP;
fuse_clear_implemented(data, FSESS_NOIMPLBIT(SETVOLNAME));
}
goto out;
}
copystr(fsap->f_vol_name, data->volname, MAXPATHLEN - 1, &namelen);
bzero(data->volname + namelen, MAXPATHLEN - namelen);
VFSATTR_SET_SUPPORTED(fsap, f_vol_name);
}
out:
return error;
}
static int
fuse_vfsop_unmount(struct mount *mp, int mntflags)
{
int err = 0;
int flags = 0;
struct cdev *fdev;
struct fuse_data *data;
struct fuse_dispatcher fdi;
struct thread *td = curthread;
fuse_trace_printf_vfsop();
if (mntflags & MNT_FORCE) {
flags |= FORCECLOSE;
}
data = fuse_get_mpdata(mp);
if (!data) {
panic("no private data for mount point?");
}
/* There is 1 extra root vnode reference (mp->mnt_data). */
FUSE_LOCK();
if (data->vroot != NULL) {
struct vnode *vroot = data->vroot;
data->vroot = NULL;
FUSE_UNLOCK();
vrele(vroot);
} else
FUSE_UNLOCK();
err = vflush(mp, 0, flags, td);
if (err) {
debug_printf("vflush failed");
return err;
}
if (fdata_get_dead(data)) {
goto alreadydead;
}
fdisp_init(&fdi, 0);
fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL);
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
fdata_set_dead(data);
alreadydead:
FUSE_LOCK();
data->mp = NULL;
fdev = data->fdev;
fdata_trydestroy(data);
FUSE_UNLOCK();
MNT_ILOCK(mp);
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp);
dev_rel(fdev);
return 0;
}
static int
fuse_vfsop_mount(struct mount *mp)
{
int err;
uint64_t mntopts, __mntopts;
int max_read_set;
uint32_t max_read;
int daemon_timeout;
int fd;
size_t len;
struct cdev *fdev;
struct fuse_data *data;
struct thread *td;
struct file *fp, *fptmp;
char *fspec, *subtype;
struct vfsoptlist *opts;
subtype = NULL;
max_read_set = 0;
max_read = ~0;
err = 0;
mntopts = 0;
__mntopts = 0;
td = curthread;
fuse_trace_printf_vfsop();
if (mp->mnt_flag & MNT_UPDATE)
return EOPNOTSUPP;
mp->mnt_flag |= MNT_SYNCHRONOUS;
mp->mnt_data = NULL;
/* Get the new options passed to mount */
opts = mp->mnt_optnew;
if (!opts)
return EINVAL;
/* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */
if (!vfs_getopts(opts, "fspath", &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
* can inform us from the flags it sets by default
*/
FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY);
FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN);
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);
if (vfs_scanopt(opts, "max_read=", "%u", &max_read) == 1)
max_read_set = 1;
if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) {
if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)
daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT;
else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT)
daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT;
} else {
daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
}
subtype = vfs_getopts(opts, "subtype=", &err);
FS_DEBUG2G("mntopts 0x%jx\n", (uintmax_t)mntopts);
err = fget(td, fd, CAP_READ, &fp);
if (err != 0) {
FS_DEBUG("invalid or not opened device: data=%p\n", data);
goto out;
}
fptmp = td->td_fpop;
td->td_fpop = fp;
err = devfs_get_cdevpriv((void **)&data);
td->td_fpop = fptmp;
fdrop(fp, td);
FUSE_LOCK();
if (err != 0 || data == NULL || data->mp != NULL) {
FS_DEBUG("invalid or not opened device: data=%p data.mp=%p\n",
data, data != NULL ? data->mp : NULL);
err = ENXIO;
FUSE_UNLOCK();
goto out;
}
if (fdata_get_dead(data)) {
FS_DEBUG("device is dead during mount: data=%p\n", data);
err = ENOTCONN;
FUSE_UNLOCK();
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);
if (err) {
FUSE_UNLOCK();
goto out;
}
/* We need this here as this slot is used by getnewvnode() */
mp->mnt_stat.f_iosize = PAGE_SIZE;
mp->mnt_data = data;
data->ref++;
data->mp = mp;
data->dataflags |= mntopts;
data->max_read = max_read;
data->daemon_timeout = daemon_timeout;
#ifdef XXXIP
if (!priv_check(td, PRIV_VFS_FUSE_SYNC_UNMOUNT))
data->dataflags |= FSESS_CAN_SYNC_UNMOUNT;
#endif
FUSE_UNLOCK();
vfs_getnewfsid(mp);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_kern_flag |= MNTK_MPSAFE;
if (subtype) {
strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN);
strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN);
}
copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &len);
bzero(mp->mnt_stat.f_mntfromname + len, MNAMELEN - len);
FS_DEBUG2G("mp %p: %s\n", mp, mp->mnt_stat.f_mntfromname);
/* Now handshaking with daemon */
fuse_internal_send_init(data, td);
out:
if (err) {
FUSE_LOCK();
if (data->mp == mp) {
/*
* Destroy device only if we acquired reference to
* it
*/
FS_DEBUG("mount failed, destroy device: data=%p mp=%p"
" err=%d\n",
data, mp, err);
data->mp = NULL;
fdata_trydestroy(data);
}
FUSE_UNLOCK();
dev_rel(fdev);
}
return err;
}
static errno_t
fuse_vfsop_mount(mount_t mp, __unused vnode_t devvp, user_addr_t udata,
vfs_context_t context)
{
int err = 0;
int mntopts = 0;
bool mounted = false;
uint32_t drandom = 0;
uint32_t max_read = ~0;
size_t len;
fuse_device_t fdev = NULL;
struct fuse_data *data = NULL;
fuse_mount_args fusefs_args;
struct vfsstatfs *vfsstatfsp = vfs_statfs(mp);
kern_return_t kr;
thread_t init_thread;
#if M_OSXFUSE_ENABLE_BIG_LOCK
fuse_biglock_t *biglock;
#endif
fuse_trace_printf_vfsop();
if (vfs_isupdate(mp)) {
return ENOTSUP;
}
err = copyin(udata, &fusefs_args, sizeof(fusefs_args));
if (err) {
return EINVAL;
}
/*
* Interesting flags that we can receive from mount or may want to
* otherwise forcibly set include:
*
* MNT_ASYNC
* MNT_AUTOMOUNTED
* MNT_DEFWRITE
* MNT_DONTBROWSE
* MNT_IGNORE_OWNERSHIP
* MNT_JOURNALED
* MNT_NODEV
* MNT_NOEXEC
* MNT_NOSUID
* MNT_NOUSERXATTR
* MNT_RDONLY
* MNT_SYNCHRONOUS
* MNT_UNION
*/
#if M_OSXFUSE_ENABLE_UNSUPPORTED
vfs_setlocklocal(mp);
#endif /* M_OSXFUSE_ENABLE_UNSUPPORTED */
/** Option Processing. **/
if (fusefs_args.altflags & FUSE_MOPT_FSTYPENAME) {
size_t typenamelen = strlen(fusefs_args.fstypename);
if ((typenamelen <= 0) || (typenamelen > FUSE_FSTYPENAME_MAXLEN)) {
return EINVAL;
}
snprintf(vfsstatfsp->f_fstypename, MFSTYPENAMELEN, "%s%s",
OSXFUSE_FSTYPENAME_PREFIX, fusefs_args.fstypename);
}
if ((fusefs_args.daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT) ||
(fusefs_args.daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)) {
return EINVAL;
}
if (fusefs_args.altflags & FUSE_MOPT_SPARSE) {
mntopts |= FSESS_SPARSE;
}
if (fusefs_args.altflags & FUSE_MOPT_SLOW_STATFS) {
mntopts |= FSESS_SLOW_STATFS;
}
if (fusefs_args.altflags & FUSE_MOPT_AUTO_CACHE) {
mntopts |= FSESS_AUTO_CACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_AUTO_XATTR) {
if (fusefs_args.altflags & FUSE_MOPT_NATIVE_XATTR) {
return EINVAL;
}
mntopts |= FSESS_AUTO_XATTR;
} else if (fusefs_args.altflags & FUSE_MOPT_NATIVE_XATTR) {
mntopts |= FSESS_NATIVE_XATTR;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_BROWSE) {
vfs_setflags(mp, MNT_DONTBROWSE);
}
if (fusefs_args.altflags & FUSE_MOPT_JAIL_SYMLINKS) {
mntopts |= FSESS_JAIL_SYMLINKS;
}
/*
* Note that unlike Linux, which keeps allow_root in user-space and
* passes allow_other in that case to the kernel, we let allow_root
* reach the kernel. The 'if' ordering is important here.
*/
if (fusefs_args.altflags & FUSE_MOPT_ALLOW_ROOT) {
int is_member = 0;
if ((kauth_cred_ismember_gid(kauth_cred_get(), fuse_admin_group,
&is_member) == 0) && is_member) {
mntopts |= FSESS_ALLOW_ROOT;
} else {
IOLog("OSXFUSE: caller not a member of OSXFUSE admin group (%d)\n",
fuse_admin_group);
return EPERM;
}
} else if (fusefs_args.altflags & FUSE_MOPT_ALLOW_OTHER) {
if (!fuse_allow_other && !fuse_vfs_context_issuser(context)) {
int is_member = 0;
if ((kauth_cred_ismember_gid(kauth_cred_get(), fuse_admin_group,
&is_member) != 0) || !is_member) {
return EPERM;
}
}
mntopts |= FSESS_ALLOW_OTHER;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_APPLEDOUBLE) {
mntopts |= FSESS_NO_APPLEDOUBLE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_APPLEXATTR) {
mntopts |= FSESS_NO_APPLEXATTR;
}
if ((fusefs_args.altflags & FUSE_MOPT_FSID) && (fusefs_args.fsid != 0)) {
fsid_t fsid;
mount_t other_mp;
uint32_t target_dev;
target_dev = FUSE_MAKEDEV(FUSE_CUSTOM_FSID_DEVICE_MAJOR,
fusefs_args.fsid);
fsid.val[0] = target_dev;
fsid.val[1] = FUSE_CUSTOM_FSID_VAL1;
other_mp = vfs_getvfs(&fsid);
if (other_mp != NULL) {
return EPERM;
}
vfsstatfsp->f_fsid.val[0] = target_dev;
vfsstatfsp->f_fsid.val[1] = FUSE_CUSTOM_FSID_VAL1;
} else {
vfs_getnewfsid(mp);
}
if (fusefs_args.altflags & FUSE_MOPT_NO_LOCALCACHES) {
mntopts |= FSESS_NO_ATTRCACHE;
mntopts |= FSESS_NO_READAHEAD;
mntopts |= FSESS_NO_UBC;
mntopts |= FSESS_NO_VNCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_ATTRCACHE) {
mntopts |= FSESS_NO_ATTRCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_READAHEAD) {
mntopts |= FSESS_NO_READAHEAD;
}
if (fusefs_args.altflags & (FUSE_MOPT_NO_UBC | FUSE_MOPT_DIRECT_IO)) {
mntopts |= FSESS_NO_UBC;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_VNCACHE) {
mntopts |= FSESS_NO_VNCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NEGATIVE_VNCACHE) {
if (mntopts & FSESS_NO_VNCACHE) {
return EINVAL;
}
mntopts |= FSESS_NEGATIVE_VNCACHE;
}
if (fusefs_args.altflags & FUSE_MOPT_NO_SYNCWRITES) {
/* Cannot mix 'nosyncwrites' with 'noubc' or 'noreadahead'. */
if (mntopts & (FSESS_NO_READAHEAD | FSESS_NO_UBC)) {
return EINVAL;
}
mntopts |= FSESS_NO_SYNCWRITES;
vfs_clearflags(mp, MNT_SYNCHRONOUS);
vfs_setflags(mp, MNT_ASYNC);
/* We check for this only if we have nosyncwrites in the first place. */
if (fusefs_args.altflags & FUSE_MOPT_NO_SYNCONCLOSE) {
mntopts |= FSESS_NO_SYNCONCLOSE;
}
} else {
vfs_clearflags(mp, MNT_ASYNC);
vfs_setflags(mp, MNT_SYNCHRONOUS);
}
if (mntopts & FSESS_NO_UBC) {
/* If no buffer cache, disallow exec from file system. */
vfs_setflags(mp, MNT_NOEXEC);
}
vfs_setauthopaque(mp);
vfs_setauthopaqueaccess(mp);
if ((fusefs_args.altflags & FUSE_MOPT_DEFAULT_PERMISSIONS) &&
(fusefs_args.altflags & FUSE_MOPT_DEFER_PERMISSIONS)) {
return EINVAL;
}
if (fusefs_args.altflags & FUSE_MOPT_DEFAULT_PERMISSIONS) {
mntopts |= FSESS_DEFAULT_PERMISSIONS;
vfs_clearauthopaque(mp);
}
if (fusefs_args.altflags & FUSE_MOPT_DEFER_PERMISSIONS) {
mntopts |= FSESS_DEFER_PERMISSIONS;
}
if (fusefs_args.altflags & FUSE_MOPT_EXTENDED_SECURITY) {
mntopts |= FSESS_EXTENDED_SECURITY;
vfs_setextendedsecurity(mp);
}
if (fusefs_args.altflags & FUSE_MOPT_LOCALVOL) {
mntopts |= FSESS_LOCALVOL;
vfs_setflags(mp, MNT_LOCAL);
}
/* done checking incoming option bits */
err = 0;
vfs_setfsprivate(mp, NULL);
fdev = fuse_device_get(fusefs_args.rdev);
if (!fdev) {
return EINVAL;
}
fuse_device_lock(fdev);
drandom = fuse_device_get_random(fdev);
if (fusefs_args.random != drandom) {
fuse_device_unlock(fdev);
IOLog("OSXFUSE: failing mount because of mismatched random\n");
return EINVAL;
}
data = fuse_device_get_mpdata(fdev);
if (!data) {
fuse_device_unlock(fdev);
return ENXIO;
}
#if M_OSXFUSE_ENABLE_BIG_LOCK
biglock = data->biglock;
fuse_biglock_lock(biglock);
#endif
if (data->mount_state != FM_NOTMOUNTED) {
#if M_OSXFUSE_ENABLE_BIG_LOCK
fuse_biglock_unlock(biglock);
#endif
fuse_device_unlock(fdev);
return EALREADY;
}
if (!(data->dataflags & FSESS_OPENED)) {
fuse_device_unlock(fdev);
err = ENXIO;
goto out;
}
data->mount_state = FM_MOUNTED;
OSAddAtomic(1, (SInt32 *)&fuse_mount_count);
mounted = true;
if (fdata_dead_get(data)) {
fuse_device_unlock(fdev);
err = ENOTCONN;
goto out;
}
if (!data->daemoncred) {
panic("OSXFUSE: daemon found but identity unknown");
}
if (fuse_vfs_context_issuser(context) &&
kauth_cred_getuid(vfs_context_ucred(context)) != kauth_cred_getuid(data->daemoncred)) {
fuse_device_unlock(fdev);
err = EPERM;
goto out;
}
data->mp = mp;
data->fdev = fdev;
data->dataflags |= mntopts;
data->daemon_timeout.tv_sec = fusefs_args.daemon_timeout;
data->daemon_timeout.tv_nsec = 0;
if (data->daemon_timeout.tv_sec) {
data->daemon_timeout_p = &(data->daemon_timeout);
} else {
data->daemon_timeout_p = (struct timespec *)0;
}
data->max_read = max_read;
data->fssubtype = fusefs_args.fssubtype;
data->mountaltflags = fusefs_args.altflags;
data->noimplflags = (uint64_t)0;
data->blocksize = fuse_round_size(fusefs_args.blocksize,
FUSE_MIN_BLOCKSIZE, FUSE_MAX_BLOCKSIZE);
data->iosize = fuse_round_size(fusefs_args.iosize,
FUSE_MIN_IOSIZE, FUSE_MAX_IOSIZE);
if (data->iosize < data->blocksize) {
data->iosize = data->blocksize;
}
data->userkernel_bufsize = FUSE_DEFAULT_USERKERNEL_BUFSIZE;
copystr(fusefs_args.fsname, vfsstatfsp->f_mntfromname,
MNAMELEN - 1, &len);
bzero(vfsstatfsp->f_mntfromname + len, MNAMELEN - len);
copystr(fusefs_args.volname, data->volname, MAXPATHLEN - 1, &len);
bzero(data->volname + len, MAXPATHLEN - len);
/* previous location of vfs_setioattr() */
vfs_setfsprivate(mp, data);
fuse_device_unlock(fdev);
/* Send a handshake message to the daemon. */
kr = kernel_thread_start(fuse_internal_init, data, &init_thread);
if (kr != KERN_SUCCESS) {
IOLog("OSXFUSE: could not start init thread\n");
err = ENOTCONN;
} else {
thread_deallocate(init_thread);
}
out:
if (err) {
vfs_setfsprivate(mp, NULL);
fuse_device_lock(fdev);
data = fuse_device_get_mpdata(fdev); /* again */
if (mounted) {
OSAddAtomic(-1, (SInt32 *)&fuse_mount_count);
}
if (data) {
data->mount_state = FM_NOTMOUNTED;
if (!(data->dataflags & FSESS_OPENED)) {
#if M_OSXFUSE_ENABLE_BIG_LOCK
assert(biglock == data->biglock);
fuse_biglock_unlock(biglock);
#endif
fuse_device_close_final(fdev);
/* data is gone now */
}
}
fuse_device_unlock(fdev);
} else {
vnode_t fuse_rootvp = NULLVP;
err = fuse_vfsop_root(mp, &fuse_rootvp, context);
if (err) {
goto out; /* go back and follow error path */
}
err = vnode_ref(fuse_rootvp);
#if M_OSXFUSE_ENABLE_BIG_LOCK
/*
* Even though fuse_rootvp will not be reclaimed when calling vnode_put
* because we incremented its usecount by calling vnode_ref release
* biglock just to be safe.
*/
fuse_biglock_unlock(biglock);
#endif /* M_OSXFUSE_ENABLE_BIG_LOCK */
(void)vnode_put(fuse_rootvp);
#if M_OSXFUSE_ENABLE_BIG_LOCK
fuse_biglock_lock(biglock);
#endif
if (err) {
goto out; /* go back and follow error path */
} else {
struct vfsioattr ioattr;
vfs_ioattr(mp, &ioattr);
ioattr.io_maxreadcnt = ioattr.io_maxwritecnt = data->iosize;
ioattr.io_segreadcnt = ioattr.io_segwritecnt = data->iosize / PAGE_SIZE;
ioattr.io_maxsegreadsize = ioattr.io_maxsegwritesize = data->iosize;
ioattr.io_devblocksize = data->blocksize;
vfs_setioattr(mp, &ioattr);
}
}
#if M_OSXFUSE_ENABLE_BIG_LOCK
fuse_device_lock(fdev);
data = fuse_device_get_mpdata(fdev); /* ...and again */
if(data) {
assert(data->biglock == biglock);
fuse_biglock_unlock(biglock);
}
fuse_device_unlock(fdev);
#endif
return err;
}