static int
fuse_read_directbackend(struct vnode *vp, struct uio *uio,
struct ucred *cred, struct fuse_filehandle *fufh)
{
struct fuse_dispatcher fdi;
struct fuse_read_in *fri;
int err = 0;
if (uio->uio_resid == 0)
return (0);
fdisp_init(&fdi, 0);
/*
* XXX In "normal" case we use an intermediate kernel buffer for
* transmitting data from daemon's context to ours. Eventually, we should
* get rid of this. Anyway, if the target uio lives in sysspace (we are
* called from pageops), and the input data doesn't need kernel-side
* processing (we are not called from readdir) we can already invoke
* an optimized, "peer-to-peer" I/O routine.
*/
while (uio->uio_resid > 0) {
fdi.iosize = sizeof(*fri);
fdisp_make_vp(&fdi, FUSE_READ, vp, uio->uio_td, cred);
fri = fdi.indata;
fri->fh = fufh->fh_id;
fri->offset = uio->uio_offset;
fri->size = MIN(uio->uio_resid,
fuse_get_mpdata(vp->v_mount)->max_read);
FS_DEBUG2G("fri->fh %ju, fri->offset %ju, fri->size %ju\n",
(uintmax_t)fri->fh, (uintmax_t)fri->offset,
(uintmax_t)fri->size);
if ((err = fdisp_wait_answ(&fdi)))
goto out;
FS_DEBUG2G("complete: got iosize=%d, requested fri.size=%zd; "
"resid=%zd offset=%ju\n",
fri->size, fdi.iosize, uio->uio_resid,
(uintmax_t)uio->uio_offset);
if ((err = uiomove(fdi.answ, MIN(fri->size, fdi.iosize), uio)))
break;
if (fdi.iosize < fri->size)
break;
}
out:
fdisp_destroy(&fdi);
return (err);
}
/*
struct vnop_remove_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
};
*/
static int
fuse_vnop_remove(struct vop_remove_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct componentname *cnp = ap->a_cnp;
int err;
FS_DEBUG2G("inode=%ju name=%*s\n",
(uintmax_t)VTOI(vp), (int)cnp->cn_namelen, cnp->cn_nameptr);
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (vnode_isdir(vp)) {
return EPERM;
}
cache_purge(vp);
err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK);
if (err == 0)
fuse_internal_vnode_disappear(vp);
return err;
}
/*
struct vnop_access_args {
struct vnode *a_vp;
#if VOP_ACCESS_TAKES_ACCMODE_T
accmode_t a_accmode;
#else
int a_mode;
#endif
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_access(struct vop_access_args *ap)
{
struct vnode *vp = ap->a_vp;
int accmode = ap->a_accmode;
struct ucred *cred = ap->a_cred;
struct fuse_access_param facp;
struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
int err;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
if (fuse_isdeadfs(vp)) {
if (vnode_isvroot(vp)) {
return 0;
}
return ENXIO;
}
if (!(data->dataflags & FSESS_INITED)) {
if (vnode_isvroot(vp)) {
if (priv_check_cred(cred, PRIV_VFS_ADMIN, 0) ||
(fuse_match_cred(data->daemoncred, cred) == 0)) {
return 0;
}
}
return EBADF;
}
if (vnode_islnk(vp)) {
return 0;
}
bzero(&facp, sizeof(facp));
err = fuse_internal_access(vp, accmode, &facp, ap->a_td, ap->a_cred);
FS_DEBUG2G("err=%d accmode=0x%x\n", err, accmode);
return err;
}
/*
struct vnop_open_args {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
int a_fdidx; / struct file *a_fp;
};
*/
static int
fuse_vnop_open(struct vop_open_args *ap)
{
struct vnode *vp = ap->a_vp;
int mode = ap->a_mode;
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
fufh_type_t fufh_type;
struct fuse_vnode_data *fvdat;
int error, isdir = 0;
int32_t fuse_open_flags;
FS_DEBUG2G("inode=%ju mode=0x%x\n", (uintmax_t)VTOI(vp), mode);
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
fvdat = VTOFUD(vp);
if (vnode_isdir(vp)) {
isdir = 1;
}
fuse_open_flags = 0;
if (isdir) {
fufh_type = FUFH_RDONLY;
} else {
fufh_type = fuse_filehandle_xlate_from_fflags(mode);
/*
* For WRONLY opens, force DIRECT_IO. This is necessary
* since writing a partial block through the buffer cache
* will result in a read of the block and that read won't
* be allowed by the WRONLY open.
*/
if (fufh_type == FUFH_WRONLY ||
(fvdat->flag & FN_DIRECTIO) != 0)
fuse_open_flags = FOPEN_DIRECT_IO;
}
if (fuse_filehandle_validrw(vp, fufh_type) != FUFH_INVALID) {
fuse_vnode_open(vp, fuse_open_flags, td);
return 0;
}
error = fuse_filehandle_open(vp, fufh_type, NULL, td, cred);
return error;
}
/*
struct vnop_read_args {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
};
*/
static int
fuse_vnop_read(struct vop_read_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
int ioflag = ap->a_ioflag;
struct ucred *cred = ap->a_cred;
FS_DEBUG2G("inode=%ju offset=%jd resid=%zd\n",
(uintmax_t)VTOI(vp), uio->uio_offset, uio->uio_resid);
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
return fuse_io_dispatch(vp, uio, ioflag, cred);
}
/*
struct vnop_readdir_args {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
int *ncookies;
u_long **a_cookies;
};
*/
static int
fuse_vnop_readdir(struct vop_readdir_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct ucred *cred = ap->a_cred;
struct fuse_filehandle *fufh = NULL;
struct fuse_vnode_data *fvdat;
struct fuse_iov cookediov;
int err = 0;
int freefufh = 0;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if ( /* XXXIP ((uio_iovcnt(uio) > 1)) || */
(uio_resid(uio) < sizeof(struct dirent))) {
return EINVAL;
}
fvdat = VTOFUD(vp);
if (!fuse_filehandle_valid(vp, FUFH_RDONLY)) {
FS_DEBUG("calling readdir() before open()");
err = fuse_filehandle_open(vp, FUFH_RDONLY, &fufh, NULL, cred);
freefufh = 1;
} else {
err = fuse_filehandle_get(vp, FUFH_RDONLY, &fufh);
}
if (err) {
return (err);
}
#define DIRCOOKEDSIZE FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + MAXNAMLEN + 1)
fiov_init(&cookediov, DIRCOOKEDSIZE);
err = fuse_internal_readdir(vp, uio, fufh, &cookediov);
fiov_teardown(&cookediov);
if (freefufh) {
fuse_filehandle_close(vp, FUFH_RDONLY, NULL, cred);
}
return err;
}
/*
struct vnop_symlink_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
};
*/
static int
fuse_vnop_symlink(struct vop_symlink_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
char *target = ap->a_target;
struct fuse_dispatcher fdi;
int err;
size_t len;
FS_DEBUG2G("inode=%ju name=%*s\n",
(uintmax_t)VTOI(dvp), (int)cnp->cn_namelen, cnp->cn_nameptr);
if (fuse_isdeadfs(dvp)) {
return ENXIO;
}
/*
* Unlike the other creator type calls, here we have to create a message
* where the name of the new entry comes first, and the data describing
* the entry comes second.
* Hence we can't rely on our handy fuse_internal_newentry() routine,
* but put together the message manually and just call the core part.
*/
len = strlen(target) + 1;
fdisp_init(&fdi, len + cnp->cn_namelen + 1);
fdisp_make_vp(&fdi, FUSE_SYMLINK, dvp, curthread, NULL);
memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdi.indata)[cnp->cn_namelen] = '\0';
memcpy((char *)fdi.indata + cnp->cn_namelen + 1, target, len);
err = fuse_internal_newentry_core(dvp, vpp, cnp, VLNK, &fdi);
fdisp_destroy(&fdi);
if (err == 0) {
fuse_invalidate_attr(dvp);
}
return err;
}
/*
struct vnop_rmdir_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} *ap;
*/
static int
fuse_vnop_rmdir(struct vop_rmdir_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
int err;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (VTOFUD(vp) == VTOFUD(dvp)) {
return EINVAL;
}
err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR);
if (err == 0)
fuse_internal_vnode_disappear(vp);
return err;
}
/*
struct vnop_open_args {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
int a_fdidx; / struct file *a_fp;
};
*/
static int
fuse_vnop_open(struct vop_open_args *ap)
{
struct vnode *vp = ap->a_vp;
int mode = ap->a_mode;
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
fufh_type_t fufh_type;
struct fuse_vnode_data *fvdat;
int error, isdir = 0;
FS_DEBUG2G("inode=%ju mode=0x%x\n", (uintmax_t)VTOI(vp), mode);
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
fvdat = VTOFUD(vp);
if (vnode_isdir(vp)) {
isdir = 1;
}
if (isdir) {
fufh_type = FUFH_RDONLY;
} else {
fufh_type = fuse_filehandle_xlate_from_fflags(mode);
}
if (fuse_filehandle_valid(vp, fufh_type)) {
fuse_vnode_open(vp, 0, td);
return 0;
}
error = fuse_filehandle_open(vp, fufh_type, NULL, td, cred);
return error;
}
/*
struct vnop_readlink_args {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
};
*/
static int
fuse_vnop_readlink(struct vop_readlink_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct ucred *cred = ap->a_cred;
struct fuse_dispatcher fdi;
int err;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (!vnode_islnk(vp)) {
return EINVAL;
}
fdisp_init(&fdi, 0);
err = fdisp_simple_putget_vp(&fdi, FUSE_READLINK, vp, curthread, cred);
if (err) {
goto out;
}
if (((char *)fdi.answ)[0] == '/' &&
fuse_get_mpdata(vnode_mount(vp))->dataflags & FSESS_PUSH_SYMLINKS_IN) {
char *mpth = vnode_mount(vp)->mnt_stat.f_mntonname;
err = uiomove(mpth, strlen(mpth), uio);
}
if (!err) {
err = uiomove(fdi.answ, fdi.iosize, uio);
}
out:
fdisp_destroy(&fdi);
return err;
}
static int
fuse_write_biobackend(struct vnode *vp, struct uio *uio,
struct ucred *cred, struct fuse_filehandle *fufh, int ioflag)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct buf *bp;
daddr_t lbn;
int bcount;
int n, on, err = 0;
const int biosize = fuse_iosize(vp);
KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
FS_DEBUG("resid=%zx offset=%jx fsize=%jx\n",
uio->uio_resid, uio->uio_offset, fvdat->filesize);
if (vp->v_type != VREG)
return (EIO);
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_resid == 0)
return (0);
if (ioflag & IO_APPEND)
uio_setoffset(uio, fvdat->filesize);
/*
* Find all of this file's B_NEEDCOMMIT buffers. If our writes
* would exceed the local maximum per-file write commit size when
* combined with those, we must decide whether to flush,
* go synchronous, or return err. We don't bother checking
* IO_UNIT -- we just make all writes atomic anyway, as there's
* no point optimizing for something that really won't ever happen.
*/
do {
if (fuse_isdeadfs(vp)) {
err = ENXIO;
break;
}
lbn = uio->uio_offset / biosize;
on = uio->uio_offset & (biosize - 1);
n = MIN((unsigned)(biosize - on), uio->uio_resid);
FS_DEBUG2G("lbn %ju, on %d, n %d, uio offset %ju, uio resid %zd\n",
(uintmax_t)lbn, on, n,
(uintmax_t)uio->uio_offset, uio->uio_resid);
again:
/*
* Handle direct append and file extension cases, calculate
* unaligned buffer size.
*/
if (uio->uio_offset == fvdat->filesize && n) {
/*
* Get the buffer (in its pre-append state to maintain
* B_CACHE if it was previously set). Resize the
* nfsnode after we have locked the buffer to prevent
* readers from reading garbage.
*/
bcount = on;
FS_DEBUG("getting block from OS, bcount %d\n", bcount);
bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
if (bp != NULL) {
long save;
err = fuse_vnode_setsize(vp, cred,
uio->uio_offset + n);
if (err) {
brelse(bp);
break;
}
save = bp->b_flags & B_CACHE;
bcount += n;
allocbuf(bp, bcount);
bp->b_flags |= save;
}
} else {
/*
* Obtain the locked cache block first, and then
* adjust the file's size as appropriate.
*/
bcount = on + n;
if ((off_t)lbn * biosize + bcount < fvdat->filesize) {
if ((off_t)(lbn + 1) * biosize < fvdat->filesize)
bcount = biosize;
else
bcount = fvdat->filesize -
(off_t)lbn *biosize;
}
FS_DEBUG("getting block from OS, bcount %d\n", bcount);
bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
if (bp && uio->uio_offset + n > fvdat->filesize) {
err = fuse_vnode_setsize(vp, cred,
uio->uio_offset + n);
if (err) {
brelse(bp);
break;
}
}
}
if (!bp) {
err = EINTR;
break;
}
/*
* Issue a READ if B_CACHE is not set. In special-append
* mode, B_CACHE is based on the buffer prior to the write
* op and is typically set, avoiding the read. If a read
* is required in special append mode, the server will
* probably send us a short-read since we extended the file
* on our end, resulting in b_resid == 0 and, thusly,
* B_CACHE getting set.
*
* We can also avoid issuing the read if the write covers
* the entire buffer. We have to make sure the buffer state
* is reasonable in this case since we will not be initiating
* I/O. See the comments in kern/vfs_bio.c's getblk() for
* more information.
*
* B_CACHE may also be set due to the buffer being cached
* normally.
*/
if (on == 0 && n == bcount) {
bp->b_flags |= B_CACHE;
bp->b_flags &= ~B_INVAL;
bp->b_ioflags &= ~BIO_ERROR;
}
if ((bp->b_flags & B_CACHE) == 0) {
bp->b_iocmd = BIO_READ;
vfs_busy_pages(bp, 0);
fuse_io_strategy(vp, bp);
if ((err = bp->b_error)) {
brelse(bp);
break;
}
}
if (bp->b_wcred == NOCRED)
bp->b_wcred = crhold(cred);
/*
* If dirtyend exceeds file size, chop it down. This should
* not normally occur but there is an append race where it
* might occur XXX, so we log it.
*
* If the chopping creates a reverse-indexed or degenerate
* situation with dirtyoff/end, we 0 both of them.
*/
if (bp->b_dirtyend > bcount) {
FS_DEBUG("FUSE append race @%lx:%d\n",
(long)bp->b_blkno * biosize,
bp->b_dirtyend - bcount);
bp->b_dirtyend = bcount;
}
if (bp->b_dirtyoff >= bp->b_dirtyend)
bp->b_dirtyoff = bp->b_dirtyend = 0;
/*
* If the new write will leave a contiguous dirty
* area, just update the b_dirtyoff and b_dirtyend,
* otherwise force a write rpc of the old dirty area.
*
* While it is possible to merge discontiguous writes due to
* our having a B_CACHE buffer ( and thus valid read data
* for the hole), we don't because it could lead to
* significant cache coherency problems with multiple clients,
* especially if locking is implemented later on.
*
* as an optimization we could theoretically maintain
* a linked list of discontinuous areas, but we would still
* have to commit them separately so there isn't much
* advantage to it except perhaps a bit of asynchronization.
*/
if (bp->b_dirtyend > 0 &&
(on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
/*
* Yes, we mean it. Write out everything to "storage"
* immediately, without hesitation. (Apart from other
* reasons: the only way to know if a write is valid
* if its actually written out.)
*/
bwrite(bp);
if (bp->b_error == EINTR) {
err = EINTR;
break;
}
goto again;
}
err = uiomove((char *)bp->b_data + on, n, uio);
/*
* Since this block is being modified, it must be written
* again and not just committed. Since write clustering does
* not work for the stage 1 data write, only the stage 2
* commit rpc, we have to clear B_CLUSTEROK as well.
*/
bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
if (err) {
bp->b_ioflags |= BIO_ERROR;
bp->b_error = err;
brelse(bp);
break;
}
/*
* Only update dirtyoff/dirtyend if not a degenerate
* condition.
*/
if (n) {
if (bp->b_dirtyend > 0) {
bp->b_dirtyoff = MIN(on, bp->b_dirtyoff);
bp->b_dirtyend = MAX((on + n), bp->b_dirtyend);
} else {
bp->b_dirtyoff = on;
bp->b_dirtyend = on + n;
}
vfs_bio_set_valid(bp, on, n);
}
err = bwrite(bp);
if (err)
break;
} while (uio->uio_resid > 0 && n > 0);
if (fuse_sync_resize && (fvdat->flag & FN_SIZECHANGE) != 0)
fuse_vnode_savesize(vp, cred);
return (err);
}
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 int
fuse_read_biobackend(struct vnode *vp, struct uio *uio,
struct ucred *cred, struct fuse_filehandle *fufh)
{
struct buf *bp;
daddr_t lbn;
int bcount;
int err = 0, n = 0, on = 0;
off_t filesize;
const int biosize = fuse_iosize(vp);
FS_DEBUG("resid=%zx offset=%jx fsize=%jx\n",
uio->uio_resid, uio->uio_offset, VTOFUD(vp)->filesize);
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
bcount = MIN(MAXBSIZE, biosize);
filesize = VTOFUD(vp)->filesize;
do {
if (fuse_isdeadfs(vp)) {
err = ENXIO;
break;
}
lbn = uio->uio_offset / biosize;
on = uio->uio_offset & (biosize - 1);
FS_DEBUG2G("biosize %d, lbn %d, on %d\n", biosize, (int)lbn, on);
/*
* Obtain the buffer cache block. Figure out the buffer size
* when we are at EOF. If we are modifying the size of the
* buffer based on an EOF condition we need to hold
* nfs_rslock() through obtaining the buffer to prevent
* a potential writer-appender from messing with n_size.
* Otherwise we may accidentally truncate the buffer and
* lose dirty data.
*
* Note that bcount is *not* DEV_BSIZE aligned.
*/
if ((off_t)lbn * biosize >= filesize) {
bcount = 0;
} else if ((off_t)(lbn + 1) * biosize > filesize) {
bcount = filesize - (off_t)lbn *biosize;
}
bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
if (!bp)
return (EINTR);
/*
* If B_CACHE is not set, we must issue the read. If this
* fails, we return an error.
*/
if ((bp->b_flags & B_CACHE) == 0) {
bp->b_iocmd = BIO_READ;
vfs_busy_pages(bp, 0);
err = fuse_io_strategy(vp, bp);
if (err) {
brelse(bp);
return (err);
}
}
/*
* on is the offset into the current bp. Figure out how many
* bytes we can copy out of the bp. Note that bcount is
* NOT DEV_BSIZE aligned.
*
* Then figure out how many bytes we can copy into the uio.
*/
n = 0;
if (on < bcount)
n = MIN((unsigned)(bcount - on), uio->uio_resid);
if (n > 0) {
FS_DEBUG2G("feeding buffeater with %d bytes of buffer %p,"
" saying %d was asked for\n",
n, bp->b_data + on, n + (int)bp->b_resid);
err = uiomove(bp->b_data + on, n, uio);
}
brelse(bp);
FS_DEBUG2G("end of turn, err %d, uio->uio_resid %zd, n %d\n",
err, uio->uio_resid, n);
} while (err == 0 && uio->uio_resid > 0 && n > 0);
return (err);
}
/*
struct vnop_lookup_args {
struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
};
*/
int
fuse_vnop_lookup(struct vop_lookup_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
struct thread *td = cnp->cn_thread;
struct ucred *cred = cnp->cn_cred;
int nameiop = cnp->cn_nameiop;
int flags = cnp->cn_flags;
int wantparent = flags & (LOCKPARENT | WANTPARENT);
int islastcn = flags & ISLASTCN;
struct mount *mp = vnode_mount(dvp);
int err = 0;
int lookup_err = 0;
struct vnode *vp = NULL;
struct fuse_dispatcher fdi;
enum fuse_opcode op;
uint64_t nid;
struct fuse_access_param facp;
FS_DEBUG2G("parent_inode=%ju - %*s\n",
(uintmax_t)VTOI(dvp), (int)cnp->cn_namelen, cnp->cn_nameptr);
if (fuse_isdeadfs(dvp)) {
*vpp = NULL;
return ENXIO;
}
if (!vnode_isdir(dvp)) {
return ENOTDIR;
}
if (islastcn && vfs_isrdonly(mp) && (nameiop != LOOKUP)) {
return EROFS;
}
/*
* We do access check prior to doing anything else only in the case
* when we are at fs root (we'd like to say, "we are at the first
* component", but that's not exactly the same... nevermind).
* See further comments at further access checks.
*/
bzero(&facp, sizeof(facp));
if (vnode_isvroot(dvp)) { /* early permission check hack */
if ((err = fuse_internal_access(dvp, VEXEC, &facp, td, cred))) {
return err;
}
}
if (flags & ISDOTDOT) {
nid = VTOFUD(dvp)->parent_nid;
if (nid == 0) {
return ENOENT;
}
fdisp_init(&fdi, 0);
op = FUSE_GETATTR;
goto calldaemon;
} else if (cnp->cn_namelen == 1 && *(cnp->cn_nameptr) == '.') {
nid = VTOI(dvp);
fdisp_init(&fdi, 0);
op = FUSE_GETATTR;
goto calldaemon;
} else if (fuse_lookup_cache_enable) {
err = cache_lookup(dvp, vpp, cnp, NULL, NULL);
switch (err) {
case -1: /* positive match */
atomic_add_acq_long(&fuse_lookup_cache_hits, 1);
return 0;
case 0: /* no match in cache */
atomic_add_acq_long(&fuse_lookup_cache_misses, 1);
break;
case ENOENT: /* negative match */
/* fall through */
default:
return err;
}
}
nid = VTOI(dvp);
fdisp_init(&fdi, cnp->cn_namelen + 1);
op = FUSE_LOOKUP;
calldaemon:
fdisp_make(&fdi, op, mp, nid, td, cred);
if (op == FUSE_LOOKUP) {
memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdi.indata)[cnp->cn_namelen] = '\0';
}
lookup_err = fdisp_wait_answ(&fdi);
if ((op == FUSE_LOOKUP) && !lookup_err) { /* lookup call succeeded */
nid = ((struct fuse_entry_out *)fdi.answ)->nodeid;
if (!nid) {
/*
* zero nodeid is the same as "not found",
* but it's also cacheable (which we keep
* keep on doing not as of writing this)
*/
lookup_err = ENOENT;
} else if (nid == FUSE_ROOT_ID) {
lookup_err = EINVAL;
}
}
if (lookup_err &&
(!fdi.answ_stat || lookup_err != ENOENT || op != FUSE_LOOKUP)) {
fdisp_destroy(&fdi);
return lookup_err;
}
/* lookup_err, if non-zero, must be ENOENT at this point */
if (lookup_err) {
if ((nameiop == CREATE || nameiop == RENAME) && islastcn
/* && directory dvp has not been removed */ ) {
if (vfs_isrdonly(mp)) {
err = EROFS;
goto out;
}
#if 0 /* THINK_ABOUT_THIS */
if ((err = fuse_internal_access(dvp, VWRITE, cred, td, &facp))) {
goto out;
}
#endif
/*
* Possibly record the position of a slot in the
* directory large enough for the new component name.
* This can be recorded in the vnode private data for
* dvp. Set the SAVENAME flag to hold onto the
* pathname for use later in VOP_CREATE or VOP_RENAME.
*/
cnp->cn_flags |= SAVENAME;
err = EJUSTRETURN;
goto out;
}
/* Consider inserting name into cache. */
/*
* No we can't use negative caching, as the fs
* changes are out of our control.
* False positives' falseness turns out just as things
* go by, but false negatives' falseness doesn't.
* (and aiding the caching mechanism with extra control
* mechanisms comes quite close to beating the whole purpose
* caching...)
*/
#if 0
if ((cnp->cn_flags & MAKEENTRY) && nameiop != CREATE) {
FS_DEBUG("inserting NULL into cache\n");
cache_enter(dvp, NULL, cnp);
}
#endif
err = ENOENT;
goto out;
} else {
/* !lookup_err */
struct fuse_entry_out *feo = NULL;
struct fuse_attr *fattr = NULL;
if (op == FUSE_GETATTR) {
fattr = &((struct fuse_attr_out *)fdi.answ)->attr;
} else {
feo = (struct fuse_entry_out *)fdi.answ;
fattr = &(feo->attr);
}
/*
* If deleting, and at end of pathname, return parameters
* which can be used to remove file. If the wantparent flag
* isn't set, we return only the directory, otherwise we go on
* and lock the inode, being careful with ".".
*/
if (nameiop == DELETE && islastcn) {
/*
* Check for write access on directory.
*/
facp.xuid = fattr->uid;
facp.facc_flags |= FACCESS_STICKY;
err = fuse_internal_access(dvp, VWRITE, &facp, td, cred);
facp.facc_flags &= ~FACCESS_XQUERIES;
if (err) {
goto out;
}
if (nid == VTOI(dvp)) {
vref(dvp);
*vpp = dvp;
} else {
err = fuse_vnode_get(dvp->v_mount, nid, dvp,
&vp, cnp, IFTOVT(fattr->mode));
if (err)
goto out;
*vpp = vp;
}
/*
* Save the name for use in VOP_RMDIR and VOP_REMOVE
* later.
*/
cnp->cn_flags |= SAVENAME;
goto out;
}
/*
* If rewriting (RENAME), return the inode and the
* information required to rewrite the present directory
* Must get inode of directory entry to verify it's a
* regular file, or empty directory.
*/
if (nameiop == RENAME && wantparent && islastcn) {
#if 0 /* THINK_ABOUT_THIS */
if ((err = fuse_internal_access(dvp, VWRITE, cred, td, &facp))) {
goto out;
}
#endif
/*
* Check for "."
*/
if (nid == VTOI(dvp)) {
err = EISDIR;
goto out;
}
err = fuse_vnode_get(vnode_mount(dvp),
nid,
dvp,
&vp,
cnp,
IFTOVT(fattr->mode));
if (err) {
goto out;
}
*vpp = vp;
/*
* Save the name for use in VOP_RENAME later.
*/
cnp->cn_flags |= SAVENAME;
goto out;
}
if (flags & ISDOTDOT) {
struct mount *mp;
int ltype;
/*
* Expanded copy of vn_vget_ino() so that
* fuse_vnode_get() can be used.
*/
mp = dvp->v_mount;
ltype = VOP_ISLOCKED(dvp);
err = vfs_busy(mp, MBF_NOWAIT);
if (err != 0) {
vfs_ref(mp);
VOP_UNLOCK(dvp, 0);
err = vfs_busy(mp, 0);
vn_lock(dvp, ltype | LK_RETRY);
vfs_rel(mp);
if (err)
goto out;
if ((dvp->v_iflag & VI_DOOMED) != 0) {
err = ENOENT;
vfs_unbusy(mp);
goto out;
}
}
VOP_UNLOCK(dvp, 0);
err = fuse_vnode_get(vnode_mount(dvp),
nid,
NULL,
&vp,
cnp,
IFTOVT(fattr->mode));
vfs_unbusy(mp);
vn_lock(dvp, ltype | LK_RETRY);
if ((dvp->v_iflag & VI_DOOMED) != 0) {
if (err == 0)
vput(vp);
err = ENOENT;
}
if (err)
goto out;
*vpp = vp;
} else if (nid == VTOI(dvp)) {
vref(dvp);
*vpp = dvp;
} else {
err = fuse_vnode_get(vnode_mount(dvp),
nid,
dvp,
&vp,
cnp,
IFTOVT(fattr->mode));
if (err) {
goto out;
}
fuse_vnode_setparent(vp, dvp);
*vpp = vp;
}
if (op == FUSE_GETATTR) {
cache_attrs(*vpp, (struct fuse_attr_out *)fdi.answ);
} else {
cache_attrs(*vpp, (struct fuse_entry_out *)fdi.answ);
}
/* Insert name into cache if appropriate. */
/*
* Nooo, caching is evil. With caching, we can't avoid stale
* information taking over the playground (cached info is not
* just positive/negative, it does have qualitative aspects,
* too). And a (VOP/FUSE)_GETATTR is always thrown anyway, when
* walking down along cached path components, and that's not
* any cheaper than FUSE_LOOKUP. This might change with
* implementing kernel side attr caching, but... In Linux,
* lookup results are not cached, and the daemon is bombarded
* with FUSE_LOOKUPS on and on. This shows that by design, the
* daemon is expected to handle frequent lookup queries
* efficiently, do its caching in userspace, and so on.
*
* So just leave the name cache alone.
*/
/*
* Well, now I know, Linux caches lookups, but with a
* timeout... So it's the same thing as attribute caching:
* we can deal with it when implement timeouts.
*/
#if 0
if (cnp->cn_flags & MAKEENTRY) {
cache_enter(dvp, *vpp, cnp);
}
#endif
}
out:
if (!lookup_err) {
/* No lookup error; need to clean up. */
if (err) { /* Found inode; exit with no vnode. */
if (op == FUSE_LOOKUP) {
fuse_internal_forget_send(vnode_mount(dvp), td, cred,
nid, 1);
}
fdisp_destroy(&fdi);
return err;
} else {
#ifndef NO_EARLY_PERM_CHECK_HACK
if (!islastcn) {
/*
* We have the attributes of the next item
* *now*, and it's a fact, and we do not
* have to do extra work for it (ie, beg the
* daemon), and it neither depends on such
* accidental things like attr caching. So
* the big idea: check credentials *now*,
* not at the beginning of the next call to
* lookup.
*
* The first item of the lookup chain (fs root)
* won't be checked then here, of course, as
* its never "the next". But go and see that
* the root is taken care about at the very
* beginning of this function.
*
* Now, given we want to do the access check
* this way, one might ask: so then why not
* do the access check just after fetching
* the inode and its attributes from the
* daemon? Why bother with producing the
* corresponding vnode at all if something
* is not OK? We know what's the deal as
* soon as we get those attrs... There is
* one bit of info though not given us by
* the daemon: whether his response is
* authorative or not... His response should
* be ignored if something is mounted over
* the dir in question. But that can be
* known only by having the vnode...
*/
int tmpvtype = vnode_vtype(*vpp);
bzero(&facp, sizeof(facp));
/*the early perm check hack */
facp.facc_flags |= FACCESS_VA_VALID;
if ((tmpvtype != VDIR) && (tmpvtype != VLNK)) {
err = ENOTDIR;
}
if (!err && !vnode_mountedhere(*vpp)) {
err = fuse_internal_access(*vpp, VEXEC, &facp, td, cred);
}
if (err) {
if (tmpvtype == VLNK)
FS_DEBUG("weird, permission error with a symlink?\n");
vput(*vpp);
*vpp = NULL;
}
}
#endif
}
}
fdisp_destroy(&fdi);
return err;
}
/*
struct vnop_getattr_args {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_getattr(struct vop_getattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct thread *td = curthread;
struct fuse_vnode_data *fvdat = VTOFUD(vp);
int err = 0;
int dataflags;
struct fuse_dispatcher fdi;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
/* Note that we are not bailing out on a dead file system just yet. */
if (!(dataflags & FSESS_INITED)) {
if (!vnode_isvroot(vp)) {
fdata_set_dead(fuse_get_mpdata(vnode_mount(vp)));
err = ENOTCONN;
debug_printf("fuse_getattr b: returning ENOTCONN\n");
return err;
} else {
goto fake;
}
}
fdisp_init(&fdi, 0);
if ((err = fdisp_simple_putget_vp(&fdi, FUSE_GETATTR, vp, td, cred))) {
if ((err == ENOTCONN) && vnode_isvroot(vp)) {
/* see comment at similar place in fuse_statfs() */
fdisp_destroy(&fdi);
goto fake;
}
if (err == ENOENT) {
fuse_internal_vnode_disappear(vp);
}
goto out;
}
cache_attrs(vp, (struct fuse_attr_out *)fdi.answ);
if (vap != VTOVA(vp)) {
memcpy(vap, VTOVA(vp), sizeof(*vap));
}
if (vap->va_type != vnode_vtype(vp)) {
fuse_internal_vnode_disappear(vp);
err = ENOENT;
goto out;
}
if ((fvdat->flag & FN_SIZECHANGE) != 0)
vap->va_size = fvdat->filesize;
if (vnode_isreg(vp) && (fvdat->flag & FN_SIZECHANGE) == 0) {
/*
* This is for those cases when the file size changed without us
* knowing, and we want to catch up.
*/
off_t new_filesize = ((struct fuse_attr_out *)
fdi.answ)->attr.size;
if (fvdat->filesize != new_filesize) {
fuse_vnode_setsize(vp, cred, new_filesize);
}
}
debug_printf("fuse_getattr e: returning 0\n");
out:
fdisp_destroy(&fdi);
return err;
fake:
bzero(vap, sizeof(*vap));
vap->va_type = vnode_vtype(vp);
return 0;
}
static int
fuse_vfsop_statfs(struct mount *mp, struct statfs *sbp)
{
struct fuse_dispatcher fdi;
int err = 0;
struct fuse_statfs_out *fsfo;
struct fuse_data *data;
FS_DEBUG2G("mp %p: %s\n", mp, mp->mnt_stat.f_mntfromname);
data = fuse_get_mpdata(mp);
if (!(data->dataflags & FSESS_INITED))
goto fake;
fdisp_init(&fdi, 0);
fdisp_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, NULL, NULL);
err = fdisp_wait_answ(&fdi);
if (err) {
fdisp_destroy(&fdi);
if (err == ENOTCONN) {
/*
* We want to seem a legitimate fs even if the daemon
* is stiff dead... (so that, eg., we can still do path
* based unmounting after the daemon dies).
*/
goto fake;
}
return err;
}
fsfo = fdi.answ;
sbp->f_blocks = fsfo->st.blocks;
sbp->f_bfree = fsfo->st.bfree;
sbp->f_bavail = fsfo->st.bavail;
sbp->f_files = fsfo->st.files;
sbp->f_ffree = fsfo->st.ffree; /* cast from uint64_t to int64_t */
sbp->f_namemax = fsfo->st.namelen;
sbp->f_bsize = fsfo->st.frsize; /* cast from uint32_t to uint64_t */
FS_DEBUG("fuse_statfs_out -- blocks: %llu, bfree: %llu, bavail: %llu, "
"fil es: %llu, ffree: %llu, bsize: %i, namelen: %i\n",
(unsigned long long)fsfo->st.blocks,
(unsigned long long)fsfo->st.bfree,
(unsigned long long)fsfo->st.bavail,
(unsigned long long)fsfo->st.files,
(unsigned long long)fsfo->st.ffree, fsfo->st.bsize,
fsfo->st.namelen);
fdisp_destroy(&fdi);
return 0;
fake:
sbp->f_blocks = 0;
sbp->f_bfree = 0;
sbp->f_bavail = 0;
sbp->f_files = 0;
sbp->f_ffree = 0;
sbp->f_namemax = 0;
sbp->f_bsize = FUSE_DEFAULT_BLOCKSIZE;
return 0;
}
/*
struct vnop_putpages_args {
struct vnode *a_vp;
vm_page_t *a_m;
int a_count;
int a_sync;
int *a_rtvals;
vm_ooffset_t a_offset;
};
*/
static int
fuse_vnop_putpages(struct vop_putpages_args *ap)
{
struct uio uio;
struct iovec iov;
vm_offset_t kva;
struct buf *bp;
int i, error, npages, count;
off_t offset;
int *rtvals;
struct vnode *vp;
struct thread *td;
struct ucred *cred;
vm_page_t *pages;
vm_ooffset_t fsize;
FS_DEBUG2G("heh\n");
vp = ap->a_vp;
KASSERT(vp->v_object, ("objectless vp passed to putpages"));
fsize = vp->v_object->un_pager.vnp.vnp_size;
td = curthread; /* XXX */
cred = curthread->td_ucred; /* XXX */
pages = ap->a_m;
count = ap->a_count;
rtvals = ap->a_rtvals;
npages = btoc(count);
offset = IDX_TO_OFF(pages[0]->pindex);
if (!fsess_opt_mmap(vnode_mount(vp))) {
FS_DEBUG("called on non-cacheable vnode??\n");
}
for (i = 0; i < npages; i++)
rtvals[i] = VM_PAGER_AGAIN;
/*
* When putting pages, do not extend file past EOF.
*/
if (offset + count > fsize) {
count = fsize - offset;
if (count < 0)
count = 0;
}
/*
* We use only the kva address for the buffer, but this is extremely
* convienient and fast.
*/
bp = getpbuf(&fuse_pbuf_freecnt);
kva = (vm_offset_t)bp->b_data;
pmap_qenter(kva, pages, npages);
PCPU_INC(cnt.v_vnodeout);
PCPU_ADD(cnt.v_vnodepgsout, count);
iov.iov_base = (caddr_t)kva;
iov.iov_len = count;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = offset;
uio.uio_resid = count;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_WRITE;
uio.uio_td = td;
error = fuse_io_dispatch(vp, &uio, IO_DIRECT, cred);
pmap_qremove(kva, npages);
relpbuf(bp, &fuse_pbuf_freecnt);
if (!error) {
int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
for (i = 0; i < nwritten; i++) {
rtvals[i] = VM_PAGER_OK;
VM_OBJECT_WLOCK(pages[i]->object);
vm_page_undirty(pages[i]);
VM_OBJECT_WUNLOCK(pages[i]->object);
}
}
return rtvals[0];
}
/*
struct vnop_getpages_args {
struct vnode *a_vp;
vm_page_t *a_m;
int a_count;
int a_reqpage;
vm_ooffset_t a_offset;
};
*/
static int
fuse_vnop_getpages(struct vop_getpages_args *ap)
{
int i, error, nextoff, size, toff, count, npages;
struct uio uio;
struct iovec iov;
vm_offset_t kva;
struct buf *bp;
struct vnode *vp;
struct thread *td;
struct ucred *cred;
vm_page_t *pages;
FS_DEBUG2G("heh\n");
vp = ap->a_vp;
KASSERT(vp->v_object, ("objectless vp passed to getpages"));
td = curthread; /* XXX */
cred = curthread->td_ucred; /* XXX */
pages = ap->a_m;
count = ap->a_count;
if (!fsess_opt_mmap(vnode_mount(vp))) {
FS_DEBUG("called on non-cacheable vnode??\n");
return (VM_PAGER_ERROR);
}
npages = btoc(count);
/*
* If the requested page is partially valid, just return it and
* allow the pager to zero-out the blanks. Partially valid pages
* can only occur at the file EOF.
*/
VM_OBJECT_WLOCK(vp->v_object);
fuse_vm_page_lock_queues();
if (pages[ap->a_reqpage]->valid != 0) {
for (i = 0; i < npages; ++i) {
if (i != ap->a_reqpage) {
fuse_vm_page_lock(pages[i]);
vm_page_free(pages[i]);
fuse_vm_page_unlock(pages[i]);
}
}
fuse_vm_page_unlock_queues();
VM_OBJECT_WUNLOCK(vp->v_object);
return 0;
}
fuse_vm_page_unlock_queues();
VM_OBJECT_WUNLOCK(vp->v_object);
/*
* We use only the kva address for the buffer, but this is extremely
* convienient and fast.
*/
bp = getpbuf(&fuse_pbuf_freecnt);
kva = (vm_offset_t)bp->b_data;
pmap_qenter(kva, pages, npages);
PCPU_INC(cnt.v_vnodein);
PCPU_ADD(cnt.v_vnodepgsin, npages);
iov.iov_base = (caddr_t)kva;
iov.iov_len = count;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
uio.uio_resid = count;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_td = td;
error = fuse_io_dispatch(vp, &uio, IO_DIRECT, cred);
pmap_qremove(kva, npages);
relpbuf(bp, &fuse_pbuf_freecnt);
if (error && (uio.uio_resid == count)) {
FS_DEBUG("error %d\n", error);
VM_OBJECT_WLOCK(vp->v_object);
fuse_vm_page_lock_queues();
for (i = 0; i < npages; ++i) {
if (i != ap->a_reqpage) {
fuse_vm_page_lock(pages[i]);
vm_page_free(pages[i]);
fuse_vm_page_unlock(pages[i]);
}
}
fuse_vm_page_unlock_queues();
VM_OBJECT_WUNLOCK(vp->v_object);
return VM_PAGER_ERROR;
}
/*
* Calculate the number of bytes read and validate only that number
* of bytes. Note that due to pending writes, size may be 0. This
* does not mean that the remaining data is invalid!
*/
size = count - uio.uio_resid;
VM_OBJECT_WLOCK(vp->v_object);
fuse_vm_page_lock_queues();
for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
vm_page_t m;
nextoff = toff + PAGE_SIZE;
m = pages[i];
if (nextoff <= size) {
/*
* Read operation filled an entire page
*/
m->valid = VM_PAGE_BITS_ALL;
KASSERT(m->dirty == 0,
("fuse_getpages: page %p is dirty", m));
} else if (size > toff) {
/*
* Read operation filled a partial page.
*/
m->valid = 0;
vm_page_set_valid_range(m, 0, size - toff);
KASSERT(m->dirty == 0,
("fuse_getpages: page %p is dirty", m));
} else {
/*
* Read operation was short. If no error occured
* we may have hit a zero-fill section. We simply
* leave valid set to 0.
*/
;
}
if (i != ap->a_reqpage)
vm_page_readahead_finish(m);
}
fuse_vm_page_unlock_queues();
VM_OBJECT_WUNLOCK(vp->v_object);
return 0;
}
/*
struct vnop_setattr_args {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_setattr(struct vop_setattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct thread *td = curthread;
struct fuse_dispatcher fdi;
struct fuse_setattr_in *fsai;
struct fuse_access_param facp;
int err = 0;
enum vtype vtyp;
int sizechanged = 0;
uint64_t newsize = 0;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
fdisp_init(&fdi, sizeof(*fsai));
fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
fsai = fdi.indata;
fsai->valid = 0;
bzero(&facp, sizeof(facp));
facp.xuid = vap->va_uid;
facp.xgid = vap->va_gid;
if (vap->va_uid != (uid_t)VNOVAL) {
facp.facc_flags |= FACCESS_CHOWN;
fsai->uid = vap->va_uid;
fsai->valid |= FATTR_UID;
}
if (vap->va_gid != (gid_t)VNOVAL) {
facp.facc_flags |= FACCESS_CHOWN;
fsai->gid = vap->va_gid;
fsai->valid |= FATTR_GID;
}
if (vap->va_size != VNOVAL) {
struct fuse_filehandle *fufh = NULL;
/*Truncate to a new value. */
fsai->size = vap->va_size;
sizechanged = 1;
newsize = vap->va_size;
fsai->valid |= FATTR_SIZE;
fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
if (fufh) {
fsai->fh = fufh->fh_id;
fsai->valid |= FATTR_FH;
}
}
if (vap->va_atime.tv_sec != VNOVAL) {
fsai->atime = vap->va_atime.tv_sec;
fsai->atimensec = vap->va_atime.tv_nsec;
fsai->valid |= FATTR_ATIME;
}
if (vap->va_mtime.tv_sec != VNOVAL) {
fsai->mtime = vap->va_mtime.tv_sec;
fsai->mtimensec = vap->va_mtime.tv_nsec;
fsai->valid |= FATTR_MTIME;
}
if (vap->va_mode != (mode_t)VNOVAL) {
fsai->mode = vap->va_mode & ALLPERMS;
fsai->valid |= FATTR_MODE;
}
if (!fsai->valid) {
goto out;
}
vtyp = vnode_vtype(vp);
if (fsai->valid & FATTR_SIZE && vtyp == VDIR) {
err = EISDIR;
goto out;
}
if (vfs_isrdonly(vnode_mount(vp)) && (fsai->valid & ~FATTR_SIZE || vtyp == VREG)) {
err = EROFS;
goto out;
}
if (fsai->valid & ~FATTR_SIZE) {
/*err = fuse_internal_access(vp, VADMIN, context, &facp); */
/*XXX */
err = 0;
}
facp.facc_flags &= ~FACCESS_XQUERIES;
if (err && !(fsai->valid & ~(FATTR_ATIME | FATTR_MTIME)) &&
vap->va_vaflags & VA_UTIMES_NULL) {
err = fuse_internal_access(vp, VWRITE, &facp, td, cred);
}
if (err)
goto out;
if ((err = fdisp_wait_answ(&fdi)))
goto out;
vtyp = IFTOVT(((struct fuse_attr_out *)fdi.answ)->attr.mode);
if (vnode_vtype(vp) != vtyp) {
if (vnode_vtype(vp) == VNON && vtyp != VNON) {
debug_printf("FUSE: Dang! vnode_vtype is VNON and vtype isn't.\n");
} else {
/*
* STALE vnode, ditch
*
* The vnode has changed its type "behind our back". There's
* nothing really we can do, so let us just force an internal
* revocation and tell the caller to try again, if interested.
*/
fuse_internal_vnode_disappear(vp);
err = EAGAIN;
}
}
if (!err && !sizechanged) {
cache_attrs(vp, (struct fuse_attr_out *)fdi.answ);
}
out:
fdisp_destroy(&fdi);
if (!err && sizechanged) {
fuse_vnode_setsize(vp, cred, newsize);
VTOFUD(vp)->flag &= ~FN_SIZECHANGE;
}
return err;
}
/*
struct vnop_rename_args {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
};
*/
static int
fuse_vnop_rename(struct vop_rename_args *ap)
{
struct vnode *fdvp = ap->a_fdvp;
struct vnode *fvp = ap->a_fvp;
struct componentname *fcnp = ap->a_fcnp;
struct vnode *tdvp = ap->a_tdvp;
struct vnode *tvp = ap->a_tvp;
struct componentname *tcnp = ap->a_tcnp;
struct fuse_data *data;
int err = 0;
FS_DEBUG2G("from: inode=%ju name=%*s -> to: inode=%ju name=%*s\n",
(uintmax_t)VTOI(fvp), (int)fcnp->cn_namelen, fcnp->cn_nameptr,
(uintmax_t)(tvp == NULL ? -1 : VTOI(tvp)),
(int)tcnp->cn_namelen, tcnp->cn_nameptr);
if (fuse_isdeadfs(fdvp)) {
return ENXIO;
}
if (fvp->v_mount != tdvp->v_mount ||
(tvp && fvp->v_mount != tvp->v_mount)) {
FS_DEBUG("cross-device rename: %s -> %s\n",
fcnp->cn_nameptr, (tcnp != NULL ? tcnp->cn_nameptr : "(NULL)"));
err = EXDEV;
goto out;
}
cache_purge(fvp);
/*
* FUSE library is expected to check if target directory is not
* under the source directory in the file system tree.
* Linux performs this check at VFS level.
*/
data = fuse_get_mpdata(vnode_mount(tdvp));
sx_xlock(&data->rename_lock);
err = fuse_internal_rename(fdvp, fcnp, tdvp, tcnp);
if (err == 0) {
if (tdvp != fdvp)
fuse_vnode_setparent(fvp, tdvp);
if (tvp != NULL)
fuse_vnode_setparent(tvp, NULL);
}
sx_unlock(&data->rename_lock);
if (tvp != NULL && tvp != fvp) {
cache_purge(tvp);
}
if (vnode_isdir(fvp)) {
if ((tvp != NULL) && vnode_isdir(tvp)) {
cache_purge(tdvp);
}
cache_purge(fdvp);
}
out:
if (tdvp == tvp) {
vrele(tdvp);
} else {
vput(tdvp);
}
if (tvp != NULL) {
vput(tvp);
}
vrele(fdvp);
vrele(fvp);
return err;
}
