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fuse_vfsops.c
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fuse_vfsops.c
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/*
* Copyright (C) 2006-2008 Google. All Rights Reserved.
* Copyright (C) 2010 Tuxera. All Rights Reserved.
* Copyright (C) 2011 Anatol Pomozov. All Rights Reserved.
*/
#include "fuse.h"
#include "fuse_device.h"
#include "fuse_internal.h"
#include "fuse_ipc.h"
#include "fuse_node.h"
#include "fuse_sysctl.h"
#include "fuse_vfsops.h"
#include "fuse_vnops.h"
#include <fuse_mount.h>
#include <libkern/version.h>
#define FUSE_MAKEDEV(x, y) ((dev_t)(((x) << 24) | (y)))
#define FUSEFS_SIGNATURE 0x55464553 // 'FUSE'
#define FUSE_CUSTOM_FSID_VAL1 FUSEFS_SIGNATURE
static errno_t
fuse_vfsop_mount(mount_t mp, vnode_t devvp, user_addr_t data, vfs_context_t context);
static errno_t
fuse_vfsop_unmount(mount_t mp, int mntflags, vfs_context_t context);
static errno_t
fuse_vfsop_root(mount_t mp, vnode_t *vpp, vfs_context_t context);
static errno_t
fuse_vfsop_getattr(mount_t mp, struct vfs_attr *attr, vfs_context_t context);
static errno_t
fuse_vfsop_sync(mount_t mp, int waitfor, vfs_context_t context);
static errno_t
fuse_vfsop_setattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t context);
static const struct timespec kZeroTime = { 0, 0 };
errno_t (**fuse_vnode_operations)(void *);
static struct vnodeopv_desc fuse_vnode_operation_vector_desc = {
&fuse_vnode_operations, // opv_desc_vector_p
fuse_vnode_operation_entries // opv_desc_ops
};
static struct vnodeopv_desc *fuse_vnode_operation_vector_desc_list[] =
{
&fuse_vnode_operation_vector_desc,
};
static struct vfsops fuse_vfs_ops = {
fuse_vfsop_mount, // vfs_mount
NULL, // vfs_start
fuse_vfsop_unmount, // vfs_unmount
fuse_vfsop_root, // vfs_root
NULL, // vfs_quotactl
fuse_vfsop_getattr, // vfs_getattr
fuse_vfsop_sync, // vfs_sync
NULL, // vfs_vget
NULL, // vfs_fhtovp
NULL, // vfs_vptofh
NULL, // vfs_init
NULL, // vfs_sysctl
fuse_vfsop_setattr, // vfs_setattr
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL } // vfs_reserved[]
};
struct vfs_fsentry fuse_vfs_entry = {
// VFS operations
&fuse_vfs_ops,
// Number of vnodeopv_desc being registered
(int)(sizeof(fuse_vnode_operation_vector_desc_list) /\
sizeof(*fuse_vnode_operation_vector_desc_list)),
// The vnodeopv_desc's
fuse_vnode_operation_vector_desc_list,
// File system type number
0,
// File system type name
FUSE4X_FS_TYPE,
// Flags specifying file system capabilities
VFS_TBLTHREADSAFE | VFS_TBL64BITREADY | VFS_TBLNOTYPENUM,
// Reserved for future use
{ NULL, NULL }
};
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);
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;
vfs_setlocklocal(mp);
/** 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.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 (data->mounted) {
fuse_lck_mtx_unlock(fdev->mtx);
return EALREADY;
}
if (!data->opened) {
fuse_lck_mtx_unlock(fdev->mtx);
err = ENXIO;
goto out;
}
data->mounted = true;
OSIncrementAtomic((SInt32 *)&fuse_mount_count);
mounted = true;
if (data->dead) {
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->max_read = max_read;
data->fssubtype = fusefs_args.fssubtype;
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) {
OSDecrementAtomic((SInt32 *)&fuse_mount_count);
}
if (data) {
data->mounted = false;
if (!data->opened) {
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;
ioattr.io_maxsegreadsize = ioattr.io_maxsegwritesize =
ioattr.io_maxreadcnt = ioattr.io_maxwritecnt = data->iosize;
ioattr.io_segreadcnt = ioattr.io_segwritecnt = data->iosize / PAGE_SIZE;
vfs_setioattr(mp, &ioattr);
}
}
return err;
}
static errno_t
fuse_vfsop_unmount(mount_t mp, int mntflags, vfs_context_t context)
{
int err = 0;
bool force = false;
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) {
force = true;
}
data = fuse_get_mpdata(mp);
if (!data) {
panic("fuse4x: no mount private data in vfs_unmount");
}
fdev = data->fdev;
if (data->dead) {
/*
* 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->inited) {
force = true;
log("fuse4x: forcing unmount on not-yet-alive file system\n");
fuse_data_kill(data);
}
fuse_rootvp = data->rootvp;
fuse_trace_printf("%s: Calling vflush(mp, fuse_rootvp, flags=0x%X);\n", __FUNCTION__, force ? FORCECLOSE : 0);
err = vflush(mp, fuse_rootvp, force ? FORCECLOSE : 0);
fuse_trace_printf("%s: Done.\n", __FUNCTION__);
if (err) {
return err;
}
if (vnode_isinuse(fuse_rootvp, 1) && !force) {
return EBUSY;
}
fuse_trace_printf("%s: Calling vnode_rele(fuse_rootp);\n", __FUNCTION__);
vnode_rele(fuse_rootvp); /* We got this reference in fuse_vfsop_mount(). */
fuse_trace_printf("%s: Done.\n", __FUNCTION__);
data->rootvp = NULLVP;
fuse_trace_printf("%s: Calling vflush(mp, NULLVP, FORCECLOSE);\n", __FUNCTION__);
(void)vflush(mp, NULLVP, FORCECLOSE);
fuse_trace_printf("%s: Done.\n", __FUNCTION__);
if (!data->dead) {
fuse_dispatcher_init(&fdi, 0 /* no data to send along */);
fuse_dispatcher_make(&fdi, FUSE_DESTROY, mp, FUSE_ROOT_ID, context);
fuse_trace_printf("%s: Waiting for reply from FUSE_DESTROY.\n", __FUNCTION__);
err = fuse_dispatcher_wait_answer(&fdi);
fuse_trace_printf("%s: Reply received.\n", __FUNCTION__);
if (!err) {
fuse_ticket_drop(fdi.ticket);
}
}
fuse_data_kill(data);
fuse_lck_mtx_lock(fdev->mtx);
vfs_setfsprivate(mp, NULL);
data->mounted = false;
OSDecrementAtomic((SInt32 *)&fuse_mount_count);
if (!data->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_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, true, &feo_root, mp,
NULLVP /* dvp */, context,
NULL /* oflags */);
*vpp = vp;
if (!err) {
data->rootvp = *vpp;
}
return err;
}
static void
handle_capabilities_and_attributes(mount_t mp, struct vfs_attr *attr)
{
struct fuse_data *data = fuse_get_mpdata(mp);
if (!data) {
panic("fuse4x: no private data for mount point?");
}
attr->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] = 0
// | VOL_CAP_FMT_PERSISTENTOBJECTIDS
| VOL_CAP_FMT_SYMBOLICLINKS
/*
* Note that we don't really have hard links in a fuse4x file system
* unless the user file system daemon provides persistent/consistent
* inode numbers. Maybe instead of returning the "wrong" answer here
* we should just deny knowledge of this capability in the valid bits
* below.
*/
| VOL_CAP_FMT_HARDLINKS
// | VOL_CAP_FMT_JOURNAL
// | VOL_CAP_FMT_JOURNAL_ACTIVE
| VOL_CAP_FMT_NO_ROOT_TIMES
| VOL_CAP_FMT_SPARSE_FILES
// | VOL_CAP_FMT_ZERO_RUNS
| VOL_CAP_FMT_CASE_SENSITIVE
| VOL_CAP_FMT_CASE_PRESERVING
| VOL_CAP_FMT_FAST_STATFS
| VOL_CAP_FMT_2TB_FILESIZE
// | VOL_CAP_FMT_OPENDENYMODES
| VOL_CAP_FMT_HIDDEN_FILES
// | VOL_CAP_FMT_PATH_FROM_ID
#if VERSION_MAJOR >= 10
// | VOL_CAP_FMT_NO_VOLUME_SIZES
// | VOL_CAP_FMT_DECMPFS_COMPRESSION
#endif
#if VERSION_MAJOR >= 11
// | VOL_CAP_FMT_64BIT_OBJECT_IDS
#endif
;
attr->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] = 0
| VOL_CAP_FMT_PERSISTENTOBJECTIDS
| VOL_CAP_FMT_SYMBOLICLINKS
| VOL_CAP_FMT_HARDLINKS
| VOL_CAP_FMT_JOURNAL
| VOL_CAP_FMT_JOURNAL_ACTIVE
| VOL_CAP_FMT_NO_ROOT_TIMES
| VOL_CAP_FMT_SPARSE_FILES
| VOL_CAP_FMT_ZERO_RUNS
| VOL_CAP_FMT_CASE_SENSITIVE
| VOL_CAP_FMT_CASE_PRESERVING
| VOL_CAP_FMT_FAST_STATFS
| VOL_CAP_FMT_2TB_FILESIZE
| VOL_CAP_FMT_OPENDENYMODES
| VOL_CAP_FMT_HIDDEN_FILES
| VOL_CAP_FMT_PATH_FROM_ID
#if VERSION_MAJOR >= 10
| VOL_CAP_FMT_NO_VOLUME_SIZES
| VOL_CAP_FMT_DECMPFS_COMPRESSION
#endif
#if VERSION_MAJOR >= 11
| VOL_CAP_FMT_64BIT_OBJECT_IDS
#endif
;
attr->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] = 0
// | VOL_CAP_INT_SEARCHFS
| VOL_CAP_INT_ATTRLIST
// | VOL_CAP_INT_NFSEXPORT
// | VOL_CAP_INT_READDIRATTR
// | VOL_CAP_INT_EXCHANGEDATA
// | VOL_CAP_INT_COPYFILE
// | VOL_CAP_INT_ALLOCATE
// | VOL_CAP_INT_VOL_RENAME
| VOL_CAP_INT_ADVLOCK
| VOL_CAP_INT_FLOCK
| VOL_CAP_INT_EXTENDED_SECURITY
// | VOL_CAP_INT_USERACCESS
// | VOL_CAP_INT_MANLOCK
// | VOL_CAP_INT_NAMEDSTREAMS
// | VOL_CAP_INT_EXTENDED_ATTR
;
if (data->dataflags & FSESS_NATIVE_XATTR) {
attr->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] |=
VOL_CAP_INT_EXTENDED_ATTR;
}
/* Don't set the EXCHANGEDATA capability if it's known not to be
* implemented in the FUSE daemon. */
if (fuse_implemented(data, FSESS_NOIMPLBIT(EXCHANGE))) {
attr->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] |=
VOL_CAP_INT_EXCHANGEDATA;
}
attr->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] = 0
| VOL_CAP_INT_SEARCHFS
| VOL_CAP_INT_ATTRLIST
| VOL_CAP_INT_NFSEXPORT
| VOL_CAP_INT_READDIRATTR
| VOL_CAP_INT_EXCHANGEDATA
| VOL_CAP_INT_COPYFILE
| VOL_CAP_INT_ALLOCATE
| VOL_CAP_INT_VOL_RENAME
| VOL_CAP_INT_ADVLOCK
| VOL_CAP_INT_FLOCK
| VOL_CAP_INT_EXTENDED_SECURITY
| VOL_CAP_INT_USERACCESS
| VOL_CAP_INT_MANLOCK
| VOL_CAP_INT_NAMEDSTREAMS
| VOL_CAP_INT_EXTENDED_ATTR
;
attr->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
attr->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
attr->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
attr->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
VFSATTR_SET_SUPPORTED(attr, f_capabilities);
attr->f_attributes.validattr.commonattr = 0
| ATTR_CMN_NAME
| ATTR_CMN_DEVID
| ATTR_CMN_FSID
| ATTR_CMN_OBJTYPE
// | ATTR_CMN_OBJTAG
| ATTR_CMN_OBJID
// | ATTR_CMN_OBJPERMANENTID
| ATTR_CMN_PAROBJID
// | ATTR_CMN_SCRIPT
// | ATTR_CMN_CRTIME
| ATTR_CMN_MODTIME
// | ATTR_CMN_CHGTIME
// | ATTR_CMN_ACCTIME
// | ATTR_CMN_BKUPTIME
// | ATTR_CMN_FNDRINFO
| ATTR_CMN_OWNERID
| ATTR_CMN_GRPID
| ATTR_CMN_ACCESSMASK
| ATTR_CMN_FLAGS
// | ATTR_CMN_USERACCESS
| ATTR_CMN_EXTENDED_SECURITY
// | ATTR_CMN_UUID
// | ATTR_CMN_GRPUUID
// | ATTR_CMN_FILEID
// | ATTR_CMN_PARENTID
#if VERSION_MAJOR >= 10
// | ATTR_CMN_FULLPATH
#endif
#if VERSION_MAJOR >= 11
// | ATTR_CMN_ADDEDTIME
#endif
;
attr->f_attributes.validattr.volattr = 0
| ATTR_VOL_FSTYPE
| ATTR_VOL_SIGNATURE
| ATTR_VOL_SIZE
| ATTR_VOL_SPACEFREE
| ATTR_VOL_SPACEAVAIL
// | ATTR_VOL_MINALLOCATION
// | ATTR_VOL_ALLOCATIONCLUMP
| ATTR_VOL_IOBLOCKSIZE
// | ATTR_VOL_OBJCOUNT
| ATTR_VOL_FILECOUNT
// | ATTR_VOL_DIRCOUNT
// | ATTR_VOL_MAXOBJCOUNT
| ATTR_VOL_MOUNTPOINT
| ATTR_VOL_NAME
| ATTR_VOL_MOUNTFLAGS
| ATTR_VOL_MOUNTEDDEVICE
// | ATTR_VOL_ENCODINGSUSED
| ATTR_VOL_CAPABILITIES
| ATTR_VOL_ATTRIBUTES
// | ATTR_VOL_INFO
;
attr->f_attributes.validattr.dirattr = 0
| ATTR_DIR_LINKCOUNT
// | ATTR_DIR_ENTRYCOUNT
// | ATTR_DIR_MOUNTSTATUS
;
attr->f_attributes.validattr.fileattr = 0
| ATTR_FILE_LINKCOUNT
| ATTR_FILE_TOTALSIZE
| ATTR_FILE_ALLOCSIZE
| ATTR_FILE_IOBLOCKSIZE
| ATTR_FILE_DEVTYPE
// | ATTR_FILE_FORKCOUNT
// | ATTR_FILE_FORKLIST
| ATTR_FILE_DATALENGTH
| ATTR_FILE_DATAALLOCSIZE
// | ATTR_FILE_RSRCLENGTH
// | ATTR_FILE_RSRCALLOCSIZE
;
attr->f_attributes.validattr.forkattr = 0;
// | ATTR_FORK_TOTALSIZE
// | ATTR_FORK_ALLOCSIZE
;
// Handle some special cases
if (!(data->dataflags & FSESS_CASE_INSENSITIVE)) {
attr->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] |=
VOL_CAP_FMT_CASE_SENSITIVE;
}
/*
if (data->dataflags & FSESS_VOL_RENAME) {
attr->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] |=
VOL_CAP_INT_VOL_RENAME;
} else {
fuse_clear_implemented(data, FSESS_NOIMPLBIT(SETVOLNAME));
}
*/
/* Not yet. */
fuse_clear_implemented(data, FSESS_NOIMPLBIT(SETVOLNAME));
if (data->dataflags & FSESS_XTIMES) {
attr->f_attributes.validattr.commonattr |=
(ATTR_CMN_BKUPTIME | ATTR_CMN_CHGTIME | ATTR_CMN_CRTIME);
} else {
fuse_clear_implemented(data, FSESS_NOIMPLBIT(GETXTIMES));
}
// All attributes that we do support, we support natively.
attr->f_attributes.nativeattr.commonattr = \
attr->f_attributes.validattr.commonattr;
attr->f_attributes.nativeattr.volattr = \
attr->f_attributes.validattr.volattr;
attr->f_attributes.nativeattr.dirattr = \
attr->f_attributes.validattr.dirattr;
attr->f_attributes.nativeattr.fileattr = \
attr->f_attributes.validattr.fileattr;
attr->f_attributes.nativeattr.forkattr = \
attr->f_attributes.validattr.forkattr;
VFSATTR_SET_SUPPORTED(attr, f_attributes);
}
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->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;
}
fuse_dispatcher_init(&fdi, 0);
fuse_dispatcher_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, context);
if ((err = fuse_dispatcher_wait_answer(&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.answer;
}
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