int
fuse_io_dispatch(struct vnode *vp, struct uio *uio, int ioflag,
struct ucred *cred)
{
struct fuse_filehandle *fufh;
int err, directio;
MPASS(vp->v_type == VREG || vp->v_type == VDIR);
err = fuse_filehandle_getrw(vp,
(uio->uio_rw == UIO_READ) ? FUFH_RDONLY : FUFH_WRONLY, &fufh);
if (err) {
printf("FUSE: io dispatch: filehandles are closed\n");
return err;
}
/*
* Ideally, when the daemon asks for direct io at open time, the
* standard file flag should be set according to this, so that would
* just change the default mode, which later on could be changed via
* fcntl(2).
* But this doesn't work, the O_DIRECT flag gets cleared at some point
* (don't know where). So to make any use of the Fuse direct_io option,
* we hardwire it into the file's private data (similarly to Linux,
* btw.).
*/
directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
switch (uio->uio_rw) {
case UIO_READ:
if (directio) {
FS_DEBUG("direct read of vnode %ju via file handle %ju\n",
(uintmax_t)VTOILLU(vp), (uintmax_t)fufh->fh_id);
err = fuse_read_directbackend(vp, uio, cred, fufh);
} else {
FS_DEBUG("buffered read of vnode %ju\n",
(uintmax_t)VTOILLU(vp));
err = fuse_read_biobackend(vp, uio, cred, fufh);
}
break;
case UIO_WRITE:
if (directio) {
FS_DEBUG("direct write of vnode %ju via file handle %ju\n",
(uintmax_t)VTOILLU(vp), (uintmax_t)fufh->fh_id);
err = fuse_write_directbackend(vp, uio, cred, fufh, ioflag);
} else {
FS_DEBUG("buffered write of vnode %ju\n",
(uintmax_t)VTOILLU(vp));
err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag);
}
break;
default:
panic("uninterpreted mode passed to fuse_io_dispatch");
}
return (err);
}
int
fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct thread *td = curthread;
struct fuse_filehandle *fufh = NULL;
struct fuse_dispatcher fdi;
struct fuse_setattr_in *fsai;
int err = 0;
DEBUG("inode=%jd size=%jd\n", VTOI(vp), fvdat->filesize);
ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
if (fuse_isdeadfs(vp)) {
return EBADF;
}
if (vnode_vtype(vp) == VDIR) {
return EISDIR;
}
if (vfs_isrdonly(vnode_mount(vp))) {
return EROFS;
}
if (cred == NULL) {
cred = td->td_ucred;
}
fdisp_init(&fdi, sizeof(*fsai));
fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
fsai = fdi.indata;
fsai->valid = 0;
// Truncate to a new value.
fsai->size = fvdat->filesize;
fsai->valid |= FATTR_SIZE;
fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
if (fufh) {
fsai->fh = fufh->fh_id;
fsai->valid |= FATTR_FH;
}
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
if (err == 0)
fvdat->flag &= ~FN_SIZECHANGE;
fuse_invalidate_attr(vp);
return err;
}
int
fuse_io_strategy(struct vnode *vp, struct buf *bp)
{
struct fuse_filehandle *fufh;
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct ucred *cred;
struct uio *uiop;
struct uio uio;
struct iovec io;
int error = 0;
const int biosize = fuse_iosize(vp);
MPASS(vp->v_type == VREG || vp->v_type == VDIR);
MPASS(bp->b_iocmd == BIO_READ || bp->b_iocmd == BIO_WRITE);
FS_DEBUG("inode=%ju offset=%jd resid=%ld\n",
(uintmax_t)VTOI(vp), (intmax_t)(((off_t)bp->b_blkno) * biosize),
bp->b_bcount);
error = fuse_filehandle_getrw(vp,
(bp->b_iocmd == BIO_READ) ? FUFH_RDONLY : FUFH_WRONLY, &fufh);
if (error) {
printf("FUSE: strategy: filehandles are closed\n");
bp->b_ioflags |= BIO_ERROR;
bp->b_error = error;
return (error);
}
cred = bp->b_iocmd == BIO_READ ? bp->b_rcred : bp->b_wcred;
uiop = &uio;
uiop->uio_iov = &io;
uiop->uio_iovcnt = 1;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_td = curthread;
/*
* clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
* do this here so we do not have to do it in all the code that
* calls us.
*/
bp->b_flags &= ~B_INVAL;
bp->b_ioflags &= ~BIO_ERROR;
KASSERT(!(bp->b_flags & B_DONE),
("fuse_io_strategy: bp %p already marked done", bp));
if (bp->b_iocmd == BIO_READ) {
io.iov_len = uiop->uio_resid = bp->b_bcount;
io.iov_base = bp->b_data;
uiop->uio_rw = UIO_READ;
uiop->uio_offset = ((off_t)bp->b_blkno) * biosize;
error = fuse_read_directbackend(vp, uiop, cred, fufh);
if ((!error && uiop->uio_resid) ||
(fsess_opt_brokenio(vnode_mount(vp)) && error == EIO &&
uiop->uio_offset < fvdat->filesize && fvdat->filesize > 0 &&
uiop->uio_offset >= fvdat->cached_attrs.va_size)) {
/*
* If we had a short read with no error, we must have
* hit a file hole. We should zero-fill the remainder.
* This can also occur if the server hits the file EOF.
*
* Holes used to be able to occur due to pending
* writes, but that is not possible any longer.
*/
int nread = bp->b_bcount - uiop->uio_resid;
int left = uiop->uio_resid;
if (error != 0) {
printf("FUSE: Fix broken io: offset %ju, "
" resid %zd, file size %ju/%ju\n",
(uintmax_t)uiop->uio_offset,
uiop->uio_resid, fvdat->filesize,
fvdat->cached_attrs.va_size);
error = 0;
}
if (left > 0)
bzero((char *)bp->b_data + nread, left);
uiop->uio_resid = 0;
}
if (error) {
bp->b_ioflags |= BIO_ERROR;
bp->b_error = error;
}
} else {
/*
* If we only need to commit, try to commit
*/
if (bp->b_flags & B_NEEDCOMMIT) {
FS_DEBUG("write: B_NEEDCOMMIT flags set\n");
}
/*
* Setup for actual write
*/
if ((off_t)bp->b_blkno * biosize + bp->b_dirtyend >
fvdat->filesize)
bp->b_dirtyend = fvdat->filesize -
(off_t)bp->b_blkno * biosize;
if (bp->b_dirtyend > bp->b_dirtyoff) {
io.iov_len = uiop->uio_resid = bp->b_dirtyend
- bp->b_dirtyoff;
uiop->uio_offset = (off_t)bp->b_blkno * biosize
+ bp->b_dirtyoff;
io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
uiop->uio_rw = UIO_WRITE;
error = fuse_write_directbackend(vp, uiop, cred, fufh, 0);
if (error == EINTR || error == ETIMEDOUT
|| (!error && (bp->b_flags & B_NEEDCOMMIT))) {
bp->b_flags &= ~(B_INVAL | B_NOCACHE);
if ((bp->b_flags & B_PAGING) == 0) {
bdirty(bp);
bp->b_flags &= ~B_DONE;
}
if ((error == EINTR || error == ETIMEDOUT) &&
(bp->b_flags & B_ASYNC) == 0)
bp->b_flags |= B_EINTR;
} else {
if (error) {
bp->b_ioflags |= BIO_ERROR;
bp->b_flags |= B_INVAL;
bp->b_error = error;
}
bp->b_dirtyoff = bp->b_dirtyend = 0;
}
} else {
bp->b_resid = 0;
bufdone(bp);
return (0);
}
}
bp->b_resid = uiop->uio_resid;
bufdone(bp);
return (error);
}
/*
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;
}
