diff --git a/sys/fs/fuse/fuse_internal.c b/sys/fs/fuse/fuse_internal.c index 0b0c24827c1e..273b4f5b8522 100644 --- a/sys/fs/fuse/fuse_internal.c +++ b/sys/fs/fuse/fuse_internal.c @@ -1,1357 +1,1349 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2007-2009 Google Inc. and Amit Singh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Copyright (C) 2005 Csaba Henk. * All rights reserved. * * Copyright (c) 2019 The FreeBSD Foundation * * Portions of this software were developed by BFF Storage Systems, LLC under * sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fuse.h" #include "fuse_file.h" #include "fuse_internal.h" #include "fuse_io.h" #include "fuse_ipc.h" #include "fuse_node.h" #include "fuse_file.h" SDT_PROVIDER_DECLARE(fusefs); /* * Fuse trace probe: * arg0: verbosity. Higher numbers give more verbose messages * arg1: Textual message */ SDT_PROBE_DEFINE2(fusefs, , internal, trace, "int", "char*"); #ifdef ZERO_PAD_INCOMPLETE_BUFS static int isbzero(void *buf, size_t len); #endif counter_u64_t fuse_lookup_cache_hits; counter_u64_t fuse_lookup_cache_misses; SYSCTL_COUNTER_U64(_vfs_fusefs_stats, OID_AUTO, lookup_cache_hits, CTLFLAG_RD, &fuse_lookup_cache_hits, "number of positive cache hits in lookup"); SYSCTL_COUNTER_U64(_vfs_fusefs_stats, OID_AUTO, lookup_cache_misses, CTLFLAG_RD, &fuse_lookup_cache_misses, "number of cache misses in lookup"); int fuse_internal_get_cached_vnode(struct mount* mp, ino_t ino, int flags, struct vnode **vpp) { struct bintime now; struct thread *td = curthread; uint64_t nodeid = ino; int error; *vpp = NULL; error = vfs_hash_get(mp, fuse_vnode_hash(nodeid), flags, td, vpp, fuse_vnode_cmp, &nodeid); if (error) return error; /* * Check the entry cache timeout. We have to do this within fusefs * instead of by using cache_enter_time/cache_lookup because those * routines are only intended to work with pathnames, not inodes */ if (*vpp != NULL) { getbinuptime(&now); if (bintime_cmp(&(VTOFUD(*vpp)->entry_cache_timeout), &now, >)){ counter_u64_add(fuse_lookup_cache_hits, 1); return 0; } else { /* Entry cache timeout */ counter_u64_add(fuse_lookup_cache_misses, 1); cache_purge(*vpp); vput(*vpp); *vpp = NULL; } } return 0; } SDT_PROBE_DEFINE0(fusefs, , internal, access_vadmin); /* Synchronously send a FUSE_ACCESS operation */ int fuse_internal_access(struct vnode *vp, accmode_t mode, struct thread *td, struct ucred *cred) { int err = 0; uint32_t mask = F_OK; int dataflags; - int vtype; struct mount *mp; struct fuse_dispatcher fdi; struct fuse_access_in *fai; struct fuse_data *data; mp = vnode_mount(vp); - vtype = vnode_vtype(vp); data = fuse_get_mpdata(mp); dataflags = data->dataflags; if (mode == 0) return 0; if (mode & VMODIFY_PERMS && vfs_isrdonly(mp)) { switch (vp->v_type) { case VDIR: /* FALLTHROUGH */ case VLNK: /* FALLTHROUGH */ case VREG: return EROFS; default: break; } } /* Unless explicitly permitted, deny everyone except the fs owner. */ if (!(dataflags & FSESS_DAEMON_CAN_SPY)) { if (fuse_match_cred(data->daemoncred, cred)) return EPERM; } if (dataflags & FSESS_DEFAULT_PERMISSIONS) { struct vattr va; fuse_internal_getattr(vp, &va, cred, td); return vaccess(vp->v_type, va.va_mode, va.va_uid, va.va_gid, mode, cred); } if (mode & VADMIN) { /* * The FUSE protocol doesn't have an equivalent of VADMIN, so * it's a bug if we ever reach this point with that bit set. */ SDT_PROBE0(fusefs, , internal, access_vadmin); } if (fsess_not_impl(mp, FUSE_ACCESS)) return 0; if ((mode & (VWRITE | VAPPEND)) != 0) mask |= W_OK; if ((mode & VREAD) != 0) mask |= R_OK; if ((mode & VEXEC) != 0) mask |= X_OK; fdisp_init(&fdi, sizeof(*fai)); fdisp_make_vp(&fdi, FUSE_ACCESS, vp, td, cred); fai = fdi.indata; fai->mask = mask; err = fdisp_wait_answ(&fdi); fdisp_destroy(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_ACCESS); err = 0; } return err; } /* * Cache FUSE attributes from attr, in attribute cache associated with vnode * 'vp'. Optionally, if argument 'vap' is not NULL, store a copy of the * converted attributes there as well. * * If the nominal attribute cache TTL is zero, do not cache on the 'vp' (but do * return the result to the caller). */ void fuse_internal_cache_attrs(struct vnode *vp, struct fuse_attr *attr, uint64_t attr_valid, uint32_t attr_valid_nsec, struct vattr *vap, bool from_server) { struct mount *mp; struct fuse_vnode_data *fvdat; struct fuse_data *data; struct vattr *vp_cache_at; mp = vnode_mount(vp); fvdat = VTOFUD(vp); data = fuse_get_mpdata(mp); ASSERT_VOP_ELOCKED(vp, "fuse_internal_cache_attrs"); fuse_validity_2_bintime(attr_valid, attr_valid_nsec, &fvdat->attr_cache_timeout); if (vnode_isreg(vp) && fvdat->cached_attrs.va_size != VNOVAL && attr->size != fvdat->cached_attrs.va_size) { if ( data->cache_mode == FUSE_CACHE_WB && fvdat->flag & FN_SIZECHANGE) { const char *msg; /* * The server changed the file's size even though we're * using writeback cacheing and and we have outstanding * dirty writes! That's a server bug. */ if (fuse_libabi_geq(data, 7, 23)) { msg = "writeback cache incoherent!." "To prevent data corruption, disable " "the writeback cache according to your " "FUSE server's documentation."; } else { msg = "writeback cache incoherent!." "To prevent data corruption, disable " "the writeback cache by setting " "vfs.fusefs.data_cache_mode to 0 or 1."; } fuse_warn(data, FSESS_WARN_WB_CACHE_INCOHERENT, msg); } if (fuse_vnode_attr_cache_valid(vp) && data->cache_mode != FUSE_CACHE_UC) { /* * The server changed the file's size even though we * have it cached and our cache has not yet expired. * That's a bug. */ fuse_warn(data, FSESS_WARN_CACHE_INCOHERENT, "cache incoherent! " "To prevent " "data corruption, disable the data cache " "by mounting with -o direct_io, or as " "directed otherwise by your FUSE server's " "documentation."); } } /* Fix our buffers if the filesize changed without us knowing */ if (vnode_isreg(vp) && attr->size != fvdat->cached_attrs.va_size) { (void)fuse_vnode_setsize(vp, attr->size, from_server); fvdat->cached_attrs.va_size = attr->size; } if (attr_valid > 0 || attr_valid_nsec > 0) vp_cache_at = &(fvdat->cached_attrs); else if (vap != NULL) vp_cache_at = vap; else return; vattr_null(vp_cache_at); vp_cache_at->va_fsid = mp->mnt_stat.f_fsid.val[0]; vp_cache_at->va_fileid = attr->ino; vp_cache_at->va_mode = attr->mode & ~S_IFMT; vp_cache_at->va_nlink = attr->nlink; vp_cache_at->va_uid = attr->uid; vp_cache_at->va_gid = attr->gid; vp_cache_at->va_rdev = attr->rdev; vp_cache_at->va_size = attr->size; /* XXX on i386, seconds are truncated to 32 bits */ vp_cache_at->va_atime.tv_sec = attr->atime; vp_cache_at->va_atime.tv_nsec = attr->atimensec; vp_cache_at->va_mtime.tv_sec = attr->mtime; vp_cache_at->va_mtime.tv_nsec = attr->mtimensec; vp_cache_at->va_ctime.tv_sec = attr->ctime; vp_cache_at->va_ctime.tv_nsec = attr->ctimensec; if (fuse_libabi_geq(data, 7, 9) && attr->blksize > 0) vp_cache_at->va_blocksize = attr->blksize; else vp_cache_at->va_blocksize = PAGE_SIZE; vp_cache_at->va_type = IFTOVT(attr->mode); vp_cache_at->va_bytes = attr->blocks * S_BLKSIZE; vp_cache_at->va_flags = 0; if (vap != vp_cache_at && vap != NULL) memcpy(vap, vp_cache_at, sizeof(*vap)); } /* fsync */ int fuse_internal_fsync_callback(struct fuse_ticket *tick, struct uio *uio) { if (tick->tk_aw_ohead.error == ENOSYS) { fsess_set_notimpl(tick->tk_data->mp, fticket_opcode(tick)); } return 0; } int fuse_internal_fsync(struct vnode *vp, struct thread *td, int waitfor, bool datasync) { struct fuse_fsync_in *ffsi = NULL; struct fuse_dispatcher fdi; struct fuse_filehandle *fufh; struct fuse_vnode_data *fvdat = VTOFUD(vp); struct mount *mp = vnode_mount(vp); int op = FUSE_FSYNC; int err = 0; if (fsess_not_impl(vnode_mount(vp), (vnode_vtype(vp) == VDIR ? FUSE_FSYNCDIR : FUSE_FSYNC))) { return 0; } if (vnode_isdir(vp)) op = FUSE_FSYNCDIR; if (fsess_not_impl(mp, op)) return 0; fdisp_init(&fdi, sizeof(*ffsi)); /* * fsync every open file handle for this file, because we can't be sure * which file handle the caller is really referring to. */ LIST_FOREACH(fufh, &fvdat->handles, next) { fdi.iosize = sizeof(*ffsi); if (ffsi == NULL) fdisp_make_vp(&fdi, op, vp, td, NULL); else fdisp_refresh_vp(&fdi, op, vp, td, NULL); ffsi = fdi.indata; ffsi->fh = fufh->fh_id; ffsi->fsync_flags = 0; if (datasync) ffsi->fsync_flags = FUSE_FSYNC_FDATASYNC; if (waitfor == MNT_WAIT) { err = fdisp_wait_answ(&fdi); } else { fuse_insert_callback(fdi.tick, fuse_internal_fsync_callback); fuse_insert_message(fdi.tick, false); } if (err == ENOSYS) { /* ENOSYS means "success, and don't call again" */ fsess_set_notimpl(mp, op); err = 0; break; } } fdisp_destroy(&fdi); return err; } /* Asynchronous invalidation */ SDT_PROBE_DEFINE3(fusefs, , internal, invalidate_entry, "struct vnode*", "struct fuse_notify_inval_entry_out*", "char*"); int fuse_internal_invalidate_entry(struct mount *mp, struct uio *uio) { struct fuse_notify_inval_entry_out fnieo; struct componentname cn; struct vnode *dvp, *vp; char name[PATH_MAX]; int err; if ((err = uiomove(&fnieo, sizeof(fnieo), uio)) != 0) return (err); if (fnieo.namelen >= sizeof(name)) return (EINVAL); if ((err = uiomove(name, fnieo.namelen, uio)) != 0) return (err); name[fnieo.namelen] = '\0'; /* fusefs does not cache "." or ".." entries */ if (strncmp(name, ".", sizeof(".")) == 0 || strncmp(name, "..", sizeof("..")) == 0) return (0); if (fnieo.parent == FUSE_ROOT_ID) err = VFS_ROOT(mp, LK_SHARED, &dvp); else err = fuse_internal_get_cached_vnode( mp, fnieo.parent, LK_SHARED, &dvp); SDT_PROBE3(fusefs, , internal, invalidate_entry, dvp, &fnieo, name); /* * If dvp is not in the cache, then it must've been reclaimed. And * since fuse_vnop_reclaim does a cache_purge, name's entry must've * been invalidated already. So we can safely return if dvp == NULL */ if (err != 0 || dvp == NULL) return (err); /* * XXX we can't check dvp's generation because the FUSE invalidate * entry message doesn't include it. Worse case is that we invalidate * an entry that didn't need to be invalidated. */ cn.cn_nameiop = LOOKUP; cn.cn_flags = 0; /* !MAKEENTRY means free cached entry */ cn.cn_cred = curthread->td_ucred; cn.cn_lkflags = LK_SHARED; cn.cn_pnbuf = NULL; cn.cn_nameptr = name; cn.cn_namelen = fnieo.namelen; err = cache_lookup(dvp, &vp, &cn, NULL, NULL); MPASS(err == 0); fuse_vnode_clear_attr_cache(dvp); vput(dvp); return (0); } SDT_PROBE_DEFINE2(fusefs, , internal, invalidate_inode, "struct vnode*", "struct fuse_notify_inval_inode_out *"); int fuse_internal_invalidate_inode(struct mount *mp, struct uio *uio) { struct fuse_notify_inval_inode_out fniio; struct vnode *vp; int err; if ((err = uiomove(&fniio, sizeof(fniio), uio)) != 0) return (err); if (fniio.ino == FUSE_ROOT_ID) err = VFS_ROOT(mp, LK_EXCLUSIVE, &vp); else err = fuse_internal_get_cached_vnode(mp, fniio.ino, LK_SHARED, &vp); SDT_PROBE2(fusefs, , internal, invalidate_inode, vp, &fniio); if (err != 0 || vp == NULL) return (err); /* * XXX we can't check vp's generation because the FUSE invalidate * entry message doesn't include it. Worse case is that we invalidate * an inode that didn't need to be invalidated. */ /* * Flush and invalidate buffers if off >= 0. Technically we only need * to flush and invalidate the range of offsets [off, off + len), but * for simplicity's sake we do everything. */ if (fniio.off >= 0) fuse_io_invalbuf(vp, curthread); fuse_vnode_clear_attr_cache(vp); vput(vp); return (0); } /* mknod */ int fuse_internal_mknod(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap) { struct fuse_data *data; struct fuse_mknod_in fmni; size_t insize; data = fuse_get_mpdata(dvp->v_mount); fmni.mode = MAKEIMODE(vap->va_type, vap->va_mode); fmni.rdev = vap->va_rdev; if (fuse_libabi_geq(data, 7, 12)) { insize = sizeof(fmni); fmni.umask = curthread->td_proc->p_pd->pd_cmask; } else { insize = FUSE_COMPAT_MKNOD_IN_SIZE; } return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKNOD, &fmni, insize, vap->va_type)); } /* readdir */ int fuse_internal_readdir(struct vnode *vp, struct uio *uio, off_t startoff, struct fuse_filehandle *fufh, struct fuse_iov *cookediov, int *ncookies, uint64_t *cookies) { int err = 0; struct fuse_dispatcher fdi; struct fuse_read_in *fri = NULL; int fnd_start; if (uio_resid(uio) == 0) return 0; fdisp_init(&fdi, 0); /* * Note that we DO NOT have a UIO_SYSSPACE here (so no need for p2p * I/O). */ /* * fnd_start is set non-zero once the offset in the directory gets * to the startoff. This is done because directories must be read * from the beginning (offset == 0) when fuse_vnop_readdir() needs * to do an open of the directory. * If it is not set non-zero here, it will be set non-zero in * fuse_internal_readdir_processdata() when uio_offset == startoff. */ fnd_start = 0; if (uio->uio_offset == startoff) fnd_start = 1; while (uio_resid(uio) > 0) { fdi.iosize = sizeof(*fri); if (fri == NULL) fdisp_make_vp(&fdi, FUSE_READDIR, vp, NULL, NULL); else fdisp_refresh_vp(&fdi, FUSE_READDIR, vp, NULL, NULL); fri = fdi.indata; fri->fh = fufh->fh_id; fri->offset = uio_offset(uio); fri->size = MIN(uio->uio_resid, fuse_get_mpdata(vp->v_mount)->max_read); if ((err = fdisp_wait_answ(&fdi))) break; if ((err = fuse_internal_readdir_processdata(uio, startoff, &fnd_start, fri->size, fdi.answ, fdi.iosize, cookediov, ncookies, &cookies))) break; } fdisp_destroy(&fdi); return ((err == -1) ? 0 : err); } /* * Return -1 to indicate that this readdir is finished, 0 if it copied * all the directory data read in and it may be possible to read more * and greater than 0 for a failure. */ int fuse_internal_readdir_processdata(struct uio *uio, off_t startoff, int *fnd_start, size_t reqsize, void *buf, size_t bufsize, struct fuse_iov *cookediov, int *ncookies, uint64_t **cookiesp) { int err = 0; int oreclen; size_t freclen; struct dirent *de; struct fuse_dirent *fudge; uint64_t *cookies; cookies = *cookiesp; if (bufsize < FUSE_NAME_OFFSET) return -1; for (;;) { if (bufsize < FUSE_NAME_OFFSET) { err = -1; break; } fudge = (struct fuse_dirent *)buf; freclen = FUSE_DIRENT_SIZE(fudge); if (bufsize < freclen) { /* * This indicates a partial directory entry at the * end of the directory data. */ err = -1; break; } #ifdef ZERO_PAD_INCOMPLETE_BUFS if (isbzero(buf, FUSE_NAME_OFFSET)) { err = -1; break; } #endif if (!fudge->namelen || fudge->namelen > MAXNAMLEN) { err = EINVAL; break; } oreclen = GENERIC_DIRSIZ((struct pseudo_dirent *) &fudge->namelen); if (oreclen > uio_resid(uio)) { /* Out of space for the dir so we are done. */ err = -1; break; } /* * Don't start to copy the directory entries out until * the requested offset in the directory is found. */ if (*fnd_start != 0) { fiov_adjust(cookediov, oreclen); bzero(cookediov->base, oreclen); de = (struct dirent *)cookediov->base; de->d_fileno = fudge->ino; de->d_off = fudge->off; de->d_reclen = oreclen; de->d_type = fudge->type; de->d_namlen = fudge->namelen; memcpy((char *)cookediov->base + sizeof(struct dirent) - MAXNAMLEN - 1, (char *)buf + FUSE_NAME_OFFSET, fudge->namelen); dirent_terminate(de); err = uiomove(cookediov->base, cookediov->len, uio); if (err) break; if (cookies != NULL) { if (*ncookies == 0) { err = -1; break; } *cookies = fudge->off; cookies++; (*ncookies)--; } } else if (startoff == fudge->off) *fnd_start = 1; buf = (char *)buf + freclen; bufsize -= freclen; uio_setoffset(uio, fudge->off); } *cookiesp = cookies; return err; } /* remove */ int fuse_internal_remove(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, enum fuse_opcode op) { struct fuse_dispatcher fdi; nlink_t nlink; int err = 0; fdisp_init(&fdi, cnp->cn_namelen + 1); fdisp_make_vp(&fdi, op, dvp, curthread, cnp->cn_cred); memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen); ((char *)fdi.indata)[cnp->cn_namelen] = '\0'; err = fdisp_wait_answ(&fdi); fdisp_destroy(&fdi); if (err) return (err); /* * Access the cached nlink even if the attr cached has expired. If * it's inaccurate, the worst that will happen is: * 1) We'll recycle the vnode even though the file has another link we * don't know about, costing a bit of cpu time, or * 2) We won't recycle the vnode even though all of its links are gone. * It will linger around until vnlru reclaims it, costing a bit of * temporary memory. */ nlink = VTOFUD(vp)->cached_attrs.va_nlink--; /* * Purge the parent's attribute cache because the daemon * should've updated its mtime and ctime. */ fuse_vnode_clear_attr_cache(dvp); /* NB: nlink could be zero if it was never cached */ if (nlink <= 1 || vnode_vtype(vp) == VDIR) { fuse_internal_vnode_disappear(vp); } else { cache_purge(vp); fuse_vnode_update(vp, FN_CTIMECHANGE); } return err; } /* rename */ int fuse_internal_rename(struct vnode *fdvp, struct componentname *fcnp, struct vnode *tdvp, struct componentname *tcnp) { struct fuse_dispatcher fdi; struct fuse_rename_in *fri; int err = 0; fdisp_init(&fdi, sizeof(*fri) + fcnp->cn_namelen + tcnp->cn_namelen + 2); fdisp_make_vp(&fdi, FUSE_RENAME, fdvp, curthread, tcnp->cn_cred); fri = fdi.indata; fri->newdir = VTOI(tdvp); memcpy((char *)fdi.indata + sizeof(*fri), fcnp->cn_nameptr, fcnp->cn_namelen); ((char *)fdi.indata)[sizeof(*fri) + fcnp->cn_namelen] = '\0'; memcpy((char *)fdi.indata + sizeof(*fri) + fcnp->cn_namelen + 1, tcnp->cn_nameptr, tcnp->cn_namelen); ((char *)fdi.indata)[sizeof(*fri) + fcnp->cn_namelen + tcnp->cn_namelen + 1] = '\0'; err = fdisp_wait_answ(&fdi); fdisp_destroy(&fdi); return err; } /* strategy */ /* entity creation */ void fuse_internal_newentry_makerequest(struct mount *mp, uint64_t dnid, struct componentname *cnp, enum fuse_opcode op, void *buf, size_t bufsize, struct fuse_dispatcher *fdip) { fdip->iosize = bufsize + cnp->cn_namelen + 1; fdisp_make(fdip, op, mp, dnid, curthread, cnp->cn_cred); memcpy(fdip->indata, buf, bufsize); memcpy((char *)fdip->indata + bufsize, cnp->cn_nameptr, cnp->cn_namelen); ((char *)fdip->indata)[bufsize + cnp->cn_namelen] = '\0'; } int fuse_internal_newentry_core(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, enum vtype vtyp, struct fuse_dispatcher *fdip) { int err = 0; struct fuse_entry_out *feo; struct mount *mp = vnode_mount(dvp); if ((err = fdisp_wait_answ(fdip))) { return err; } feo = fdip->answ; if ((err = fuse_internal_checkentry(feo, vtyp))) { return err; } err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vtyp); if (err) { fuse_internal_forget_send(mp, curthread, cnp->cn_cred, feo->nodeid, 1); return err; } /* * Purge the parent's attribute cache because the daemon should've * updated its mtime and ctime */ fuse_vnode_clear_attr_cache(dvp); fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid, feo->attr_valid_nsec, NULL, true); return err; } int fuse_internal_newentry(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, enum fuse_opcode op, void *buf, size_t bufsize, enum vtype vtype) { int err; struct fuse_dispatcher fdi; struct mount *mp = vnode_mount(dvp); fdisp_init(&fdi, 0); fuse_internal_newentry_makerequest(mp, VTOI(dvp), cnp, op, buf, bufsize, &fdi); err = fuse_internal_newentry_core(dvp, vpp, cnp, vtype, &fdi); fdisp_destroy(&fdi); return err; } /* entity destruction */ int fuse_internal_forget_callback(struct fuse_ticket *ftick, struct uio *uio) { fuse_internal_forget_send(ftick->tk_data->mp, curthread, NULL, ((struct fuse_in_header *)ftick->tk_ms_fiov.base)->nodeid, 1); return 0; } void fuse_internal_forget_send(struct mount *mp, struct thread *td, struct ucred *cred, uint64_t nodeid, uint64_t nlookup) { struct fuse_dispatcher fdi; struct fuse_forget_in *ffi; /* * KASSERT(nlookup > 0, ("zero-times forget for vp #%llu", * (long long unsigned) nodeid)); */ fdisp_init(&fdi, sizeof(*ffi)); fdisp_make(&fdi, FUSE_FORGET, mp, nodeid, td, cred); ffi = fdi.indata; ffi->nlookup = nlookup; fuse_insert_message(fdi.tick, false); fdisp_destroy(&fdi); } /* Fetch the vnode's attributes from the daemon*/ int fuse_internal_do_getattr(struct vnode *vp, struct vattr *vap, struct ucred *cred, struct thread *td) { struct fuse_dispatcher fdi; struct fuse_vnode_data *fvdat = VTOFUD(vp); struct fuse_getattr_in *fgai; struct fuse_attr_out *fao; off_t old_filesize = fvdat->cached_attrs.va_size; struct timespec old_atime = fvdat->cached_attrs.va_atime; struct timespec old_ctime = fvdat->cached_attrs.va_ctime; struct timespec old_mtime = fvdat->cached_attrs.va_mtime; enum vtype vtyp; int err; ASSERT_VOP_LOCKED(vp, __func__); fdisp_init(&fdi, sizeof(*fgai)); fdisp_make_vp(&fdi, FUSE_GETATTR, vp, td, cred); fgai = fdi.indata; /* * We could look up a file handle and set it in fgai->fh, but that * involves extra runtime work and I'm unaware of any file systems that * care. */ fgai->getattr_flags = 0; if ((err = fdisp_wait_answ(&fdi))) { if (err == ENOENT) fuse_internal_vnode_disappear(vp); goto out; } fao = (struct fuse_attr_out *)fdi.answ; vtyp = IFTOVT(fao->attr.mode); if (fvdat->flag & FN_SIZECHANGE) fao->attr.size = old_filesize; if (fvdat->flag & FN_ATIMECHANGE) { fao->attr.atime = old_atime.tv_sec; fao->attr.atimensec = old_atime.tv_nsec; } if (fvdat->flag & FN_CTIMECHANGE) { fao->attr.ctime = old_ctime.tv_sec; fao->attr.ctimensec = old_ctime.tv_nsec; } if (fvdat->flag & FN_MTIMECHANGE) { fao->attr.mtime = old_mtime.tv_sec; fao->attr.mtimensec = old_mtime.tv_nsec; } fuse_internal_cache_attrs(vp, &fao->attr, fao->attr_valid, fao->attr_valid_nsec, vap, true); if (vtyp != vnode_vtype(vp)) { fuse_internal_vnode_disappear(vp); err = ENOENT; } out: fdisp_destroy(&fdi); return err; } /* Read a vnode's attributes from cache or fetch them from the fuse daemon */ int fuse_internal_getattr(struct vnode *vp, struct vattr *vap, struct ucred *cred, struct thread *td) { struct vattr *attrs; if ((attrs = VTOVA(vp)) != NULL) { *vap = *attrs; /* struct copy */ return 0; } return fuse_internal_do_getattr(vp, vap, cred, td); } void fuse_internal_vnode_disappear(struct vnode *vp) { struct fuse_vnode_data *fvdat = VTOFUD(vp); ASSERT_VOP_ELOCKED(vp, "fuse_internal_vnode_disappear"); fvdat->flag |= FN_REVOKED; cache_purge(vp); } /* fuse start/stop */ SDT_PROBE_DEFINE2(fusefs, , internal, init_done, "struct fuse_data*", "struct fuse_init_out*"); int fuse_internal_init_callback(struct fuse_ticket *tick, struct uio *uio) { int err = 0; struct fuse_data *data = tick->tk_data; struct fuse_init_out *fiio; if ((err = tick->tk_aw_ohead.error)) { goto out; } if ((err = fticket_pull(tick, uio))) { goto out; } fiio = fticket_resp(tick)->base; data->fuse_libabi_major = fiio->major; data->fuse_libabi_minor = fiio->minor; if (!fuse_libabi_geq(data, 7, 4)) { /* * With a little work we could support servers as old as 7.1. * But there would be little payoff. */ SDT_PROBE2(fusefs, , internal, trace, 1, "userpace version too low"); err = EPROTONOSUPPORT; goto out; } if (fuse_libabi_geq(data, 7, 5)) { if (fticket_resp(tick)->len == sizeof(struct fuse_init_out) || fticket_resp(tick)->len == FUSE_COMPAT_22_INIT_OUT_SIZE) { data->max_write = fiio->max_write; if (fiio->flags & FUSE_ASYNC_READ) data->dataflags |= FSESS_ASYNC_READ; if (fiio->flags & FUSE_POSIX_LOCKS) data->dataflags |= FSESS_POSIX_LOCKS; if (fiio->flags & FUSE_EXPORT_SUPPORT) data->dataflags |= FSESS_EXPORT_SUPPORT; if (fiio->flags & FUSE_NO_OPEN_SUPPORT) data->dataflags |= FSESS_NO_OPEN_SUPPORT; if (fiio->flags & FUSE_NO_OPENDIR_SUPPORT) data->dataflags |= FSESS_NO_OPENDIR_SUPPORT; /* * Don't bother to check FUSE_BIG_WRITES, because it's * redundant with max_write */ /* * max_background and congestion_threshold are not * implemented */ } else { err = EINVAL; } } else { /* Old fixed values */ data->max_write = 4096; } if (fuse_libabi_geq(data, 7, 6)) data->max_readahead_blocks = fiio->max_readahead / maxbcachebuf; if (!fuse_libabi_geq(data, 7, 7)) fsess_set_notimpl(data->mp, FUSE_INTERRUPT); if (!fuse_libabi_geq(data, 7, 8)) { fsess_set_notimpl(data->mp, FUSE_BMAP); fsess_set_notimpl(data->mp, FUSE_DESTROY); } if (!fuse_libabi_geq(data, 7, 19)) { fsess_set_notimpl(data->mp, FUSE_FALLOCATE); } if (fuse_libabi_geq(data, 7, 23) && fiio->time_gran >= 1 && fiio->time_gran <= 1000000000) data->time_gran = fiio->time_gran; else data->time_gran = 1; if (!fuse_libabi_geq(data, 7, 23)) data->cache_mode = fuse_data_cache_mode; else if (fiio->flags & FUSE_WRITEBACK_CACHE) data->cache_mode = FUSE_CACHE_WB; else data->cache_mode = FUSE_CACHE_WT; if (!fuse_libabi_geq(data, 7, 24)) fsess_set_notimpl(data->mp, FUSE_LSEEK); if (!fuse_libabi_geq(data, 7, 28)) fsess_set_notimpl(data->mp, FUSE_COPY_FILE_RANGE); out: if (err) { fdata_set_dead(data); } FUSE_LOCK(); data->dataflags |= FSESS_INITED; SDT_PROBE2(fusefs, , internal, init_done, data, fiio); wakeup(&data->ticketer); FUSE_UNLOCK(); return 0; } void fuse_internal_send_init(struct fuse_data *data, struct thread *td) { struct fuse_init_in *fiii; struct fuse_dispatcher fdi; fdisp_init(&fdi, sizeof(*fiii)); fdisp_make(&fdi, FUSE_INIT, data->mp, 0, td, NULL); fiii = fdi.indata; fiii->major = FUSE_KERNEL_VERSION; fiii->minor = FUSE_KERNEL_MINOR_VERSION; /* * fusefs currently reads ahead no more than one cache block at a time. * See fuse_read_biobackend */ fiii->max_readahead = maxbcachebuf; /* * Unsupported features: * FUSE_FILE_OPS: No known FUSE server or client supports it * FUSE_ATOMIC_O_TRUNC: our VFS cannot support it * FUSE_DONT_MASK: unlike Linux, FreeBSD always applies the umask, even * when default ACLs are in use. * FUSE_SPLICE_WRITE, FUSE_SPLICE_MOVE, FUSE_SPLICE_READ: FreeBSD * doesn't have splice(2). * FUSE_FLOCK_LOCKS: not yet implemented * FUSE_HAS_IOCTL_DIR: not yet implemented * FUSE_AUTO_INVAL_DATA: not yet implemented * FUSE_DO_READDIRPLUS: not yet implemented * FUSE_READDIRPLUS_AUTO: not yet implemented * FUSE_ASYNC_DIO: not yet implemented * FUSE_PARALLEL_DIROPS: not yet implemented * FUSE_HANDLE_KILLPRIV: not yet implemented * FUSE_POSIX_ACL: not yet implemented * FUSE_ABORT_ERROR: not yet implemented * FUSE_CACHE_SYMLINKS: not yet implemented * FUSE_MAX_PAGES: not yet implemented */ fiii->flags = FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | FUSE_NO_OPENDIR_SUPPORT; fuse_insert_callback(fdi.tick, fuse_internal_init_callback); fuse_insert_message(fdi.tick, false); fdisp_destroy(&fdi); } /* * Send a FUSE_SETATTR operation with no permissions checks. If cred is NULL, * send the request with root credentials */ int fuse_internal_setattr(struct vnode *vp, struct vattr *vap, struct thread *td, struct ucred *cred) { struct fuse_vnode_data *fvdat; struct fuse_dispatcher fdi; struct fuse_setattr_in *fsai; struct mount *mp; pid_t pid = td->td_proc->p_pid; struct fuse_data *data; - int dataflags; int err = 0; enum vtype vtyp; - int sizechanged = -1; - uint64_t newsize = 0; ASSERT_VOP_ELOCKED(vp, __func__); mp = vnode_mount(vp); fvdat = VTOFUD(vp); data = fuse_get_mpdata(mp); - dataflags = data->dataflags; fdisp_init(&fdi, sizeof(*fsai)); fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred); if (!cred) { fdi.finh->uid = 0; fdi.finh->gid = 0; } fsai = fdi.indata; fsai->valid = 0; if (vap->va_uid != (uid_t)VNOVAL) { fsai->uid = vap->va_uid; fsai->valid |= FATTR_UID; } if (vap->va_gid != (gid_t)VNOVAL) { 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, FWRITE, &fufh, cred, pid); if (fufh) { fsai->fh = fufh->fh_id; fsai->valid |= FATTR_FH; } VTOFUD(vp)->flag &= ~FN_SIZECHANGE; } 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_vaflags & VA_UTIMES_NULL) fsai->valid |= FATTR_ATIME_NOW; } else if (fvdat->flag & FN_ATIMECHANGE) { fsai->atime = fvdat->cached_attrs.va_atime.tv_sec; fsai->atimensec = fvdat->cached_attrs.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_vaflags & VA_UTIMES_NULL) fsai->valid |= FATTR_MTIME_NOW; } else if (fvdat->flag & FN_MTIMECHANGE) { fsai->mtime = fvdat->cached_attrs.va_mtime.tv_sec; fsai->mtimensec = fvdat->cached_attrs.va_mtime.tv_nsec; fsai->valid |= FATTR_MTIME; } if (fuse_libabi_geq(data, 7, 23) && fvdat->flag & FN_CTIMECHANGE) { fsai->ctime = fvdat->cached_attrs.va_ctime.tv_sec; fsai->ctimensec = fvdat->cached_attrs.va_ctime.tv_nsec; fsai->valid |= FATTR_CTIME; } if (vap->va_mode != (mode_t)VNOVAL) { fsai->mode = vap->va_mode & ALLPERMS; fsai->valid |= FATTR_MODE; } if (!fsai->valid) { 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) { SDT_PROBE2(fusefs, , internal, trace, 1, "FUSE: Dang! " "vnode_vtype is VNON and vtype isn't."); } else { /* * STALE vnode, ditch * * The vnode has changed its type "behind our back". * This probably means that the file got deleted and * recreated on the server, with the same inode. * There's nothing really we can do, so let us just * return ENOENT. After all, the entry must not have * existed in the recent past. If the user tries * again, it will work. */ fuse_internal_vnode_disappear(vp); err = ENOENT; } } if (err == 0) { struct fuse_attr_out *fao = (struct fuse_attr_out*)fdi.answ; fuse_vnode_undirty_cached_timestamps(vp, true); fuse_internal_cache_attrs(vp, &fao->attr, fao->attr_valid, fao->attr_valid_nsec, NULL, false); getnanouptime(&fvdat->last_local_modify); } out: fdisp_destroy(&fdi); return err; } /* * FreeBSD clears the SUID and SGID bits on any write by a non-root user. */ void fuse_internal_clear_suid_on_write(struct vnode *vp, struct ucred *cred, struct thread *td) { struct fuse_data *data; struct mount *mp; struct vattr va; int dataflags; mp = vnode_mount(vp); data = fuse_get_mpdata(mp); dataflags = data->dataflags; ASSERT_VOP_LOCKED(vp, __func__); if (dataflags & FSESS_DEFAULT_PERMISSIONS) { if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID)) { fuse_internal_getattr(vp, &va, cred, td); if (va.va_mode & (S_ISUID | S_ISGID)) { mode_t mode = va.va_mode & ~(S_ISUID | S_ISGID); /* Clear all vattr fields except mode */ vattr_null(&va); va.va_mode = mode; /* * Ignore fuse_internal_setattr's return value, * because at this point the write operation has * already succeeded and we don't want to return * failing status for that. */ (void)fuse_internal_setattr(vp, &va, td, NULL); } } } } #ifdef ZERO_PAD_INCOMPLETE_BUFS static int isbzero(void *buf, size_t len) { int i; for (i = 0; i < len; i++) { if (((char *)buf)[i]) return (0); } return (1); } #endif void fuse_internal_init(void) { fuse_lookup_cache_misses = counter_u64_alloc(M_WAITOK); fuse_lookup_cache_hits = counter_u64_alloc(M_WAITOK); } void fuse_internal_destroy(void) { counter_u64_free(fuse_lookup_cache_hits); counter_u64_free(fuse_lookup_cache_misses); } diff --git a/sys/fs/fuse/fuse_io.c b/sys/fs/fuse/fuse_io.c index bd757acf64bb..07c0f958e028 100644 --- a/sys/fs/fuse/fuse_io.c +++ b/sys/fs/fuse/fuse_io.c @@ -1,964 +1,958 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2007-2009 Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Copyright (C) 2005 Csaba Henk. * All rights reserved. * * Copyright (c) 2019 The FreeBSD Foundation * * Portions of this software were developed by BFF Storage Systems, LLC under * sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fuse.h" #include "fuse_file.h" #include "fuse_node.h" #include "fuse_internal.h" #include "fuse_ipc.h" #include "fuse_io.h" /* * Set in a struct buf to indicate that the write came from the buffer cache * and the originating cred and pid are no longer known. */ #define B_FUSEFS_WRITE_CACHE B_FS_FLAG1 SDT_PROVIDER_DECLARE(fusefs); /* * Fuse trace probe: * arg0: verbosity. Higher numbers give more verbose messages * arg1: Textual message */ SDT_PROBE_DEFINE2(fusefs, , io, trace, "int", "char*"); SDT_PROBE_DEFINE4(fusefs, , io, read_bio_backend_start, "int", "int", "int", "int"); SDT_PROBE_DEFINE2(fusefs, , io, read_bio_backend_feed, "int", "struct buf*"); SDT_PROBE_DEFINE4(fusefs, , io, read_bio_backend_end, "int", "ssize_t", "int", "struct buf*"); int fuse_read_biobackend(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred, struct fuse_filehandle *fufh, pid_t pid) { struct buf *bp; struct mount *mp; struct fuse_data *data; daddr_t lbn, nextlbn; int bcount, nextsize; int err, n = 0, on = 0, seqcount; off_t filesize; const int biosize = fuse_iosize(vp); mp = vnode_mount(vp); data = fuse_get_mpdata(mp); if (uio->uio_offset < 0) return (EINVAL); seqcount = ioflag >> IO_SEQSHIFT; err = fuse_vnode_size(vp, &filesize, cred, curthread); if (err) return err; for (err = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { if (fuse_isdeadfs(vp)) { err = ENXIO; break; } if (filesize - uio->uio_offset <= 0) break; lbn = uio->uio_offset / biosize; on = uio->uio_offset & (biosize - 1); if ((off_t)lbn * biosize >= filesize) { bcount = 0; } else if ((off_t)(lbn + 1) * biosize > filesize) { bcount = filesize - (off_t)lbn *biosize; } else { bcount = biosize; } nextlbn = lbn + 1; nextsize = MIN(biosize, filesize - nextlbn * biosize); SDT_PROBE4(fusefs, , io, read_bio_backend_start, biosize, (int)lbn, on, bcount); if (bcount < biosize) { /* If near EOF, don't do readahead */ err = bread(vp, lbn, bcount, NOCRED, &bp); } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { /* Try clustered read */ long totread = uio->uio_resid + on; seqcount = MIN(seqcount, data->max_readahead_blocks + 1); err = cluster_read(vp, filesize, lbn, bcount, NOCRED, totread, seqcount, 0, &bp); } else if (seqcount > 1 && data->max_readahead_blocks >= 1) { /* Try non-clustered readahead */ err = breadn(vp, lbn, bcount, &nextlbn, &nextsize, 1, NOCRED, &bp); } else { /* Just read what was requested */ err = bread(vp, lbn, bcount, NOCRED, &bp); } if (err) { brelse(bp); bp = NULL; break; } /* * 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 - bp->b_resid) n = MIN((unsigned)(bcount - bp->b_resid - on), uio->uio_resid); if (n > 0) { SDT_PROBE2(fusefs, , io, read_bio_backend_feed, n, bp); err = uiomove(bp->b_data + on, n, uio); } vfs_bio_brelse(bp, ioflag); SDT_PROBE4(fusefs, , io, read_bio_backend_end, err, uio->uio_resid, n, bp); if (bp->b_resid > 0) { /* Short read indicates EOF */ break; } } return (err); } SDT_PROBE_DEFINE1(fusefs, , io, read_directbackend_start, "struct fuse_read_in*"); SDT_PROBE_DEFINE3(fusefs, , io, read_directbackend_complete, "struct fuse_dispatcher*", "struct fuse_read_in*", "struct uio*"); int fuse_read_directbackend(struct vnode *vp, struct uio *uio, struct ucred *cred, struct fuse_filehandle *fufh) { struct fuse_data *data; struct fuse_dispatcher fdi; struct fuse_read_in *fri; int err = 0; data = fuse_get_mpdata(vp->v_mount); 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); if (fuse_libabi_geq(data, 7, 9)) { /* See comment regarding FUSE_WRITE_LOCKOWNER */ fri->read_flags = 0; fri->flags = fufh_type_2_fflags(fufh->fufh_type); } SDT_PROBE1(fusefs, , io, read_directbackend_start, fri); if ((err = fdisp_wait_answ(&fdi))) goto out; SDT_PROBE3(fusefs, , io, read_directbackend_complete, &fdi, fri, uio); if ((err = uiomove(fdi.answ, MIN(fri->size, fdi.iosize), uio))) break; if (fdi.iosize < fri->size) { /* * Short read. Should only happen at EOF or with * direct io. */ break; } } out: fdisp_destroy(&fdi); return (err); } int fuse_write_directbackend(struct vnode *vp, struct uio *uio, struct ucred *cred, struct fuse_filehandle *fufh, off_t filesize, int ioflag, bool pages) { struct fuse_vnode_data *fvdat = VTOFUD(vp); struct fuse_data *data; struct fuse_write_in *fwi; struct fuse_write_out *fwo; struct fuse_dispatcher fdi; size_t chunksize; void *fwi_data; off_t as_written_offset; int diff; int err = 0; bool direct_io = fufh->fuse_open_flags & FOPEN_DIRECT_IO; bool wrote_anything = false; uint32_t write_flags; data = fuse_get_mpdata(vp->v_mount); /* * Don't set FUSE_WRITE_LOCKOWNER in write_flags. It can't be set * accurately when using POSIX AIO, libfuse doesn't use it, and I'm not * aware of any file systems that do. It was an attempt to add * Linux-style mandatory locking to the FUSE protocol, but mandatory * locking is deprecated even on Linux. See Linux commit * f33321141b273d60cbb3a8f56a5489baad82ba5e . */ /* * Set FUSE_WRITE_CACHE whenever we don't know the uid, gid, and/or pid * that originated a write. For example when writing from the * writeback cache. I don't know of a single file system that cares, * but the protocol says we're supposed to do this. */ write_flags = !pages && ( (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp)) || !fsess_opt_writeback(vnode_mount(vp))) ? 0 : FUSE_WRITE_CACHE; if (uio->uio_resid == 0) return (0); if (ioflag & IO_APPEND) uio_setoffset(uio, filesize); if (vn_rlimit_fsize(vp, uio, uio->uio_td)) return (EFBIG); fdisp_init(&fdi, 0); while (uio->uio_resid > 0) { size_t sizeof_fwi; if (fuse_libabi_geq(data, 7, 9)) { sizeof_fwi = sizeof(*fwi); } else { sizeof_fwi = FUSE_COMPAT_WRITE_IN_SIZE; } chunksize = MIN(uio->uio_resid, data->max_write); fdi.iosize = sizeof_fwi + chunksize; fdisp_make_vp(&fdi, FUSE_WRITE, vp, uio->uio_td, cred); fwi = fdi.indata; fwi->fh = fufh->fh_id; fwi->offset = uio->uio_offset; fwi->size = chunksize; fwi->write_flags = write_flags; if (fuse_libabi_geq(data, 7, 9)) { fwi->flags = fufh_type_2_fflags(fufh->fufh_type); } fwi_data = (char *)fdi.indata + sizeof_fwi; if ((err = uiomove(fwi_data, chunksize, uio))) break; retry: err = fdisp_wait_answ(&fdi); if (err == ERESTART || err == EINTR || err == EWOULDBLOCK) { /* * Rewind the uio so dofilewrite will know it's * incomplete */ uio->uio_resid += fwi->size; uio->uio_offset -= fwi->size; /* * Change ERESTART into EINTR because we can't rewind * uio->uio_iov. Basically, once uiomove(9) has been * called, it's impossible to restart a syscall. */ if (err == ERESTART) err = EINTR; break; } else if (err) { break; } else { wrote_anything = true; } fwo = ((struct fuse_write_out *)fdi.answ); /* Adjust the uio in the case of short writes */ diff = fwi->size - fwo->size; as_written_offset = uio->uio_offset - diff; if (as_written_offset - diff > filesize) { fuse_vnode_setsize(vp, as_written_offset, false); getnanouptime(&fvdat->last_local_modify); } if (as_written_offset - diff >= filesize) fvdat->flag &= ~FN_SIZECHANGE; if (diff < 0) { fuse_warn(data, FSESS_WARN_WROTE_LONG, "wrote more data than we provided it."); err = EINVAL; break; } else if (diff > 0) { /* Short write */ if (!direct_io) { fuse_warn(data, FSESS_WARN_SHORT_WRITE, "short writes are only allowed with " "direct_io."); } if (ioflag & IO_DIRECT) { /* Return early */ uio->uio_resid += diff; uio->uio_offset -= diff; break; } else { /* Resend the unwritten portion of data */ fdi.iosize = sizeof_fwi + diff; /* Refresh fdi without clearing data buffer */ fdisp_refresh_vp(&fdi, FUSE_WRITE, vp, uio->uio_td, cred); fwi = fdi.indata; MPASS2(fwi == fdi.indata, "FUSE dispatcher " "reallocated despite no increase in " "size?"); void *src = (char*)fwi_data + fwo->size; memmove(fwi_data, src, diff); fwi->fh = fufh->fh_id; fwi->offset = as_written_offset; fwi->size = diff; fwi->write_flags = write_flags; goto retry; } } } fdisp_destroy(&fdi); if (wrote_anything) fuse_vnode_undirty_cached_timestamps(vp, false); return (err); } SDT_PROBE_DEFINE6(fusefs, , io, write_biobackend_start, "int64_t", "int", "int", "struct uio*", "int", "bool"); SDT_PROBE_DEFINE2(fusefs, , io, write_biobackend_append_race, "long", "int"); SDT_PROBE_DEFINE2(fusefs, , io, write_biobackend_issue, "int", "struct buf*"); int fuse_write_biobackend(struct vnode *vp, struct uio *uio, struct ucred *cred, struct fuse_filehandle *fufh, int ioflag, pid_t pid) { struct fuse_vnode_data *fvdat = VTOFUD(vp); struct buf *bp; daddr_t lbn; off_t filesize; int bcount; int n, on, seqcount, err = 0; - bool last_page; const int biosize = fuse_iosize(vp); seqcount = ioflag >> IO_SEQSHIFT; KASSERT(uio->uio_rw == UIO_WRITE, ("fuse_write_biobackend mode")); if (vp->v_type != VREG) return (EIO); if (uio->uio_offset < 0) return (EINVAL); if (uio->uio_resid == 0) return (0); err = fuse_vnode_size(vp, &filesize, cred, curthread); if (err) return err; if (ioflag & IO_APPEND) uio_setoffset(uio, filesize); if (vn_rlimit_fsize(vp, uio, uio->uio_td)) return (EFBIG); do { bool direct_append, extending; 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); again: /* Get or create a buffer for the write */ direct_append = uio->uio_offset == filesize && n; if (uio->uio_offset + n < filesize) { extending = false; if ((off_t)(lbn + 1) * biosize < filesize) { /* Not the file's last block */ bcount = biosize; } else { /* The file's last block */ bcount = filesize - (off_t)lbn * biosize; } } else { extending = true; bcount = on + n; } - if (howmany(((off_t)lbn * biosize + on + n - 1), PAGE_SIZE) >= - howmany(filesize, PAGE_SIZE)) - last_page = true; - else - last_page = false; if (direct_append) { /* * Take care to preserve the buffer's B_CACHE state so * as not to cause an unnecessary read. */ bp = getblk(vp, lbn, on, PCATCH, 0, 0); if (bp != NULL) { uint32_t save = bp->b_flags & B_CACHE; allocbuf(bp, bcount); bp->b_flags |= save; } } else { bp = getblk(vp, lbn, bcount, PCATCH, 0, 0); } if (!bp) { err = EINTR; break; } if (extending) { /* * Extend file _after_ locking buffer so we won't race * with other readers */ err = fuse_vnode_setsize(vp, uio->uio_offset + n, false); filesize = uio->uio_offset + n; getnanouptime(&fvdat->last_local_modify); fvdat->flag |= FN_SIZECHANGE; if (err) { brelse(bp); break; } } SDT_PROBE6(fusefs, , io, write_biobackend_start, lbn, on, n, uio, bcount, direct_append); /* * 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_resid > 0) { /* * Short read indicates EOF. Update file size * from the server and try again. */ SDT_PROBE2(fusefs, , io, trace, 1, "Short read during a RMW"); brelse(bp); err = fuse_vnode_size(vp, &filesize, cred, curthread); if (err) break; else goto again; } } 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) { SDT_PROBE2(fusefs, , io, write_biobackend_append_race, (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.) */ SDT_PROBE2(fusefs, , io, write_biobackend_issue, 0, bp); bwrite(bp); if (bp->b_error == EINTR) { err = EINTR; break; } goto again; } err = uiomove((char *)bp->b_data + on, n, uio); if (err) { bp->b_ioflags |= BIO_ERROR; bp->b_error = err; brelse(bp); break; /* TODO: vfs_bio_clrbuf like ffs_write does? */ } /* * 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); } vfs_bio_set_flags(bp, ioflag); bp->b_flags |= B_FUSEFS_WRITE_CACHE; if (ioflag & IO_SYNC) { SDT_PROBE2(fusefs, , io, write_biobackend_issue, 2, bp); if (!(ioflag & IO_VMIO)) bp->b_flags &= ~B_FUSEFS_WRITE_CACHE; err = bwrite(bp); } else if (vm_page_count_severe() || buf_dirty_count_severe() || (ioflag & IO_ASYNC)) { bp->b_flags |= B_CLUSTEROK; SDT_PROBE2(fusefs, , io, write_biobackend_issue, 3, bp); bawrite(bp); } else if (on == 0 && n == bcount) { if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { bp->b_flags |= B_CLUSTEROK; SDT_PROBE2(fusefs, , io, write_biobackend_issue, 4, bp); cluster_write(vp, &fvdat->clusterw, bp, filesize, seqcount, 0); } else { SDT_PROBE2(fusefs, , io, write_biobackend_issue, 5, bp); bawrite(bp); } } else if (ioflag & IO_DIRECT) { bp->b_flags |= B_CLUSTEROK; SDT_PROBE2(fusefs, , io, write_biobackend_issue, 6, bp); bawrite(bp); } else { bp->b_flags &= ~B_CLUSTEROK; SDT_PROBE2(fusefs, , io, write_biobackend_issue, 7, bp); bdwrite(bp); } if (err) break; } while (uio->uio_resid > 0 && n > 0); return (err); } int fuse_io_strategy(struct vnode *vp, struct buf *bp) { struct fuse_vnode_data *fvdat = VTOFUD(vp); struct fuse_filehandle *fufh; struct ucred *cred; struct uio *uiop; struct uio uio; struct iovec io; off_t filesize; int error = 0; int fflag; /* We don't know the true pid when we're dealing with the cache */ pid_t pid = 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); fflag = bp->b_iocmd == BIO_READ ? FREAD : FWRITE; cred = bp->b_iocmd == BIO_READ ? bp->b_rcred : bp->b_wcred; error = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid); if (bp->b_iocmd == BIO_READ && error == EBADF) { /* * This may be a read-modify-write operation on a cached file * opened O_WRONLY. The FUSE protocol allows this. */ error = fuse_filehandle_get(vp, FWRITE, &fufh, cred, pid); } if (error) { printf("FUSE: strategy: filehandles are closed\n"); bp->b_ioflags |= BIO_ERROR; bp->b_error = error; bufdone(bp); return (error); } 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) { ssize_t left; 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_lblkno) * biosize; error = fuse_read_directbackend(vp, uiop, cred, fufh); /* * Store the amount we failed to read in the buffer's private * field, so callers can truncate the file if necessary' */ if (!error && uiop->uio_resid) { int nread = bp->b_bcount - uiop->uio_resid; left = uiop->uio_resid; bzero((char *)bp->b_data + nread, left); if ((fvdat->flag & FN_SIZECHANGE) == 0) { /* * A short read with no error, when not using * direct io, and when no writes are cached, * indicates EOF caused by a server-side * truncation. Clear the attr cache so we'll * pick up the new file size and timestamps. * * We must still bzero the remaining buffer so * uninitialized data doesn't get exposed by a * future truncate that extends the file. * * To prevent lock order problems, we must * truncate the file upstack, not here. */ SDT_PROBE2(fusefs, , io, trace, 1, "Short read of a clean file"); fuse_vnode_clear_attr_cache(vp); } else { /* * If dirty writes _are_ cached beyond EOF, * that indicates a newly created hole that the * server doesn't know about. Those don't pose * any problem. * XXX: we don't currently track whether dirty * writes are cached beyond EOF, before EOF, or * both. */ SDT_PROBE2(fusefs, , io, trace, 1, "Short read of a dirty file"); uiop->uio_resid = 0; } } if (error) { bp->b_ioflags |= BIO_ERROR; bp->b_error = error; } } else { /* * Setup for actual write */ /* * If the file's size is cached, use that value, even if the * cache is expired. At this point we're already committed to * writing something. If the FUSE server has changed the * file's size behind our back, it's too late for us to do * anything about it. In particular, we can't invalidate any * part of the file's buffers because VOP_STRATEGY is called * with them already locked. */ filesize = fvdat->cached_attrs.va_size; /* filesize must've been cached by fuse_vnop_open. */ KASSERT(filesize != VNOVAL, ("filesize should've been cached")); if ((off_t)bp->b_lblkno * biosize + bp->b_dirtyend > filesize) bp->b_dirtyend = filesize - (off_t)bp->b_lblkno * 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_lblkno * biosize + bp->b_dirtyoff; io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; uiop->uio_rw = UIO_WRITE; bool pages = bp->b_flags & B_FUSEFS_WRITE_CACHE; error = fuse_write_directbackend(vp, uiop, cred, fufh, filesize, 0, pages); if (error == EINTR || error == ETIMEDOUT) { 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); } int fuse_io_flushbuf(struct vnode *vp, int waitfor, struct thread *td) { return (vn_fsync_buf(vp, waitfor)); } /* * Flush and invalidate all dirty buffers. If another process is already * doing the flush, just wait for completion. */ int fuse_io_invalbuf(struct vnode *vp, struct thread *td) { struct fuse_vnode_data *fvdat = VTOFUD(vp); int error = 0; if (VN_IS_DOOMED(vp)) return 0; ASSERT_VOP_ELOCKED(vp, "fuse_io_invalbuf"); while (fvdat->flag & FN_FLUSHINPROG) { struct proc *p = td->td_proc; if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) return EIO; fvdat->flag |= FN_FLUSHWANT; tsleep(&fvdat->flag, PRIBIO + 2, "fusevinv", 2 * hz); error = 0; if (p != NULL) { PROC_LOCK(p); if (SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist)) error = EINTR; PROC_UNLOCK(p); } if (error == EINTR) return EINTR; } fvdat->flag |= FN_FLUSHINPROG; if (vp->v_bufobj.bo_object != NULL) { VM_OBJECT_WLOCK(vp->v_bufobj.bo_object); vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object); } error = vinvalbuf(vp, V_SAVE, PCATCH, 0); while (error) { if (error == ERESTART || error == EINTR) { fvdat->flag &= ~FN_FLUSHINPROG; if (fvdat->flag & FN_FLUSHWANT) { fvdat->flag &= ~FN_FLUSHWANT; wakeup(&fvdat->flag); } return EINTR; } error = vinvalbuf(vp, V_SAVE, PCATCH, 0); } fvdat->flag &= ~FN_FLUSHINPROG; if (fvdat->flag & FN_FLUSHWANT) { fvdat->flag &= ~FN_FLUSHWANT; wakeup(&fvdat->flag); } return (error); } diff --git a/sys/fs/fuse/fuse_node.c b/sys/fs/fuse/fuse_node.c index 183229d79b9d..ca20c71eeae3 100644 --- a/sys/fs/fuse/fuse_node.c +++ b/sys/fs/fuse/fuse_node.c @@ -1,530 +1,529 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2007-2009 Google Inc. and Amit Singh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Copyright (C) 2005 Csaba Henk. * All rights reserved. * * Copyright (c) 2019 The FreeBSD Foundation * * Portions of this software were developed by BFF Storage Systems, LLC under * sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fuse.h" #include "fuse_node.h" #include "fuse_internal.h" #include "fuse_io.h" #include "fuse_ipc.h" SDT_PROVIDER_DECLARE(fusefs); /* * Fuse trace probe: * arg0: verbosity. Higher numbers give more verbose messages * arg1: Textual message */ SDT_PROBE_DEFINE2(fusefs, , node, trace, "int", "char*"); MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data"); static int sysctl_fuse_cache_mode(SYSCTL_HANDLER_ARGS); static counter_u64_t fuse_node_count; SYSCTL_COUNTER_U64(_vfs_fusefs_stats, OID_AUTO, node_count, CTLFLAG_RD, &fuse_node_count, "Count of FUSE vnodes"); int fuse_data_cache_mode = FUSE_CACHE_WT; /* * DEPRECATED * This sysctl is no longer needed as of fuse protocol 7.23. Individual * servers can select the cache behavior they need for each mountpoint: * - writethrough: the default * - writeback: set FUSE_WRITEBACK_CACHE in fuse_init_out.flags * - uncached: set FOPEN_DIRECT_IO for every file * The sysctl is retained primarily for use by jails supporting older FUSE * protocols. It may be removed entirely once FreeBSD 11.3 and 12.0 are EOL. */ SYSCTL_PROC(_vfs_fusefs, OID_AUTO, data_cache_mode, CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, &fuse_data_cache_mode, 0, sysctl_fuse_cache_mode, "I", "Zero: disable caching of FUSE file data; One: write-through caching " "(default); Two: write-back caching (generally unsafe)"); static int sysctl_fuse_cache_mode(SYSCTL_HANDLER_ARGS) { int val, error; val = *(int *)arg1; error = sysctl_handle_int(oidp, &val, 0, req); if (error || !req->newptr) return (error); switch (val) { case FUSE_CACHE_UC: case FUSE_CACHE_WT: case FUSE_CACHE_WB: *(int *)arg1 = val; break; default: return (EDOM); } return (0); } static void fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat, uint64_t nodeid, enum vtype vtyp) { fvdat->nid = nodeid; LIST_INIT(&fvdat->handles); vattr_null(&fvdat->cached_attrs); if (nodeid == FUSE_ROOT_ID) { vp->v_vflag |= VV_ROOT; } vp->v_type = vtyp; vp->v_data = fvdat; cluster_init_vn(&fvdat->clusterw); timespecclear(&fvdat->last_local_modify); counter_u64_add(fuse_node_count, 1); } void fuse_vnode_destroy(struct vnode *vp) { struct fuse_vnode_data *fvdat = vp->v_data; vp->v_data = NULL; KASSERT(LIST_EMPTY(&fvdat->handles), ("Destroying fuse vnode with open files!")); free(fvdat, M_FUSEVN); counter_u64_add(fuse_node_count, -1); } int fuse_vnode_cmp(struct vnode *vp, void *nidp) { return (VTOI(vp) != *((uint64_t *)nidp)); } SDT_PROBE_DEFINE3(fusefs, , node, stale_vnode, "struct vnode*", "enum vtype", "uint64_t"); static int fuse_vnode_alloc(struct mount *mp, struct thread *td, uint64_t nodeid, enum vtype vtyp, struct vnode **vpp) { struct fuse_data *data; struct fuse_vnode_data *fvdat; struct vnode *vp2; int err = 0; data = fuse_get_mpdata(mp); if (vtyp == VNON) { return EINVAL; } *vpp = NULL; err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp, fuse_vnode_cmp, &nodeid); if (err) return (err); if (*vpp) { if ((*vpp)->v_type == vtyp) { /* Reuse a vnode that hasn't yet been reclaimed */ MPASS((*vpp)->v_data != NULL); MPASS(VTOFUD(*vpp)->nid == nodeid); SDT_PROBE2(fusefs, , node, trace, 1, "vnode taken from hash"); return (0); } else { /* * The inode changed types! If we get here, we can't * tell whether the inode's entry cache had expired * yet. So this could be the result of a buggy server, * but more likely the server just reused an inode * number following an entry cache expiration. */ SDT_PROBE3(fusefs, , node, stale_vnode, *vpp, vtyp, nodeid); fuse_internal_vnode_disappear(*vpp); vgone(*vpp); lockmgr((*vpp)->v_vnlock, LK_RELEASE, NULL); } } fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO); switch (vtyp) { case VFIFO: err = getnewvnode("fuse", mp, &fuse_fifoops, vpp); break; default: err = getnewvnode("fuse", mp, &fuse_vnops, vpp); break; } if (err) { free(fvdat, M_FUSEVN); return (err); } lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL); fuse_vnode_init(*vpp, fvdat, nodeid, vtyp); err = insmntque(*vpp, mp); ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc"); if (err) { lockmgr((*vpp)->v_vnlock, LK_RELEASE, NULL); free(fvdat, M_FUSEVN); *vpp = NULL; return (err); } /* Disallow async reads for fifos because UFS does. I don't know why */ if (data->dataflags & FSESS_ASYNC_READ && vtyp != VFIFO) VN_LOCK_ASHARE(*vpp); err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, &vp2, fuse_vnode_cmp, &nodeid); if (err) { lockmgr((*vpp)->v_vnlock, LK_RELEASE, NULL); free(fvdat, M_FUSEVN); *vpp = NULL; return (err); } if (vp2 != NULL) { *vpp = vp2; return (0); } ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc"); return (0); } int fuse_vnode_get(struct mount *mp, struct fuse_entry_out *feo, uint64_t nodeid, struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, enum vtype vtyp) { struct thread *td = curthread; /* * feo should only be NULL for the root directory, which (when libfuse * is used) always has generation 0 */ uint64_t generation = feo ? feo->generation : 0; int err = 0; err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp); if (err) { return err; } if (dvp != NULL) { MPASS(cnp && (cnp->cn_flags & ISDOTDOT) == 0); MPASS(cnp && !(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.')); fuse_vnode_setparent(*vpp, dvp); } if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0 && feo != NULL && (feo->entry_valid != 0 || feo->entry_valid_nsec != 0)) { struct timespec timeout; ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get"); ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get"); fuse_validity_2_timespec(feo, &timeout); cache_enter_time(dvp, *vpp, cnp, &timeout, NULL); } VTOFUD(*vpp)->generation = generation; /* * In userland, libfuse uses cached lookups for dot and dotdot entries, * thus it does not really bump the nlookup counter for forget. * Follow the same semantic and avoid the bump in order to keep * nlookup counters consistent. */ if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 && (cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.'))) VTOFUD(*vpp)->nlookup++; return 0; } /* * Called for every fusefs vnode open to initialize the vnode (not * fuse_filehandle) for use */ void fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td) { if (vnode_vtype(vp) == VREG) vnode_create_vobject(vp, 0, td); } int fuse_vnode_savesize(struct vnode *vp, struct ucred *cred, pid_t pid) { 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; 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. */ MPASS((fvdat->flag & FN_SIZECHANGE) != 0); fsai->size = fvdat->cached_attrs.va_size; fsai->valid |= FATTR_SIZE; fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); if (fufh) { fsai->fh = fufh->fh_id; fsai->valid |= FATTR_FH; } err = fdisp_wait_answ(&fdi); fdisp_destroy(&fdi); if (err == 0) { getnanouptime(&fvdat->last_local_modify); fvdat->flag &= ~FN_SIZECHANGE; } return err; } /* * Adjust the vnode's size to a new value. * * If the new value came from the server, such as from a FUSE_GETATTR * operation, set `from_server` true. But if it came from a local operation, * such as write(2) or truncate(2), set `from_server` false. */ int fuse_vnode_setsize(struct vnode *vp, off_t newsize, bool from_server) { struct fuse_vnode_data *fvdat = VTOFUD(vp); struct vattr *attrs; off_t oldsize; size_t iosize; struct buf *bp = NULL; int err = 0; ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize"); iosize = fuse_iosize(vp); oldsize = fvdat->cached_attrs.va_size; fvdat->cached_attrs.va_size = newsize; if ((attrs = VTOVA(vp)) != NULL) attrs->va_size = newsize; if (newsize < oldsize) { daddr_t lbn; err = vtruncbuf(vp, newsize, fuse_iosize(vp)); if (err) goto out; if (newsize % iosize == 0) goto out; /* * Zero the contents of the last partial block. * Sure seems like vtruncbuf should do this for us. */ lbn = newsize / iosize; bp = getblk(vp, lbn, iosize, PCATCH, 0, 0); if (!bp) { err = EINTR; goto out; } if (!(bp->b_flags & B_CACHE)) goto out; /* Nothing to do */ MPASS(bp->b_flags & B_VMIO); vfs_bio_clrbuf(bp); bp->b_dirtyend = MIN(bp->b_dirtyend, newsize - lbn * iosize); } else if (from_server && newsize > oldsize && oldsize != VNOVAL) { /* * The FUSE server changed the file size behind our back. We * should invalidate the entire cache. */ - daddr_t left_lbn, end_lbn; + daddr_t end_lbn; - left_lbn = oldsize / iosize; end_lbn = howmany(newsize, iosize); v_inval_buf_range(vp, 0, end_lbn, iosize); } out: if (bp) brelse(bp); vnode_pager_setsize(vp, newsize); return err; } /* Get the current, possibly dirty, size of the file */ int fuse_vnode_size(struct vnode *vp, off_t *filesize, struct ucred *cred, struct thread *td) { struct fuse_vnode_data *fvdat = VTOFUD(vp); int error = 0; if (!(fvdat->flag & FN_SIZECHANGE) && (!fuse_vnode_attr_cache_valid(vp) || fvdat->cached_attrs.va_size == VNOVAL)) error = fuse_internal_do_getattr(vp, NULL, cred, td); if (!error) *filesize = fvdat->cached_attrs.va_size; return error; } void fuse_vnode_undirty_cached_timestamps(struct vnode *vp, bool atime) { struct fuse_vnode_data *fvdat = VTOFUD(vp); fvdat->flag &= ~(FN_MTIMECHANGE | FN_CTIMECHANGE); if (atime) fvdat->flag &= ~FN_ATIMECHANGE; } /* Update a fuse file's cached timestamps */ void fuse_vnode_update(struct vnode *vp, int flags) { struct fuse_vnode_data *fvdat = VTOFUD(vp); struct mount *mp = vnode_mount(vp); struct fuse_data *data = fuse_get_mpdata(mp); struct timespec ts; vfs_timestamp(&ts); if (data->time_gran > 1) ts.tv_nsec = rounddown(ts.tv_nsec, data->time_gran); if (mp->mnt_flag & MNT_NOATIME) flags &= ~FN_ATIMECHANGE; if (flags & FN_ATIMECHANGE) fvdat->cached_attrs.va_atime = ts; if (flags & FN_MTIMECHANGE) fvdat->cached_attrs.va_mtime = ts; if (flags & FN_CTIMECHANGE) fvdat->cached_attrs.va_ctime = ts; fvdat->flag |= flags; } void fuse_node_init(void) { fuse_node_count = counter_u64_alloc(M_WAITOK); } void fuse_node_destroy(void) { counter_u64_free(fuse_node_count); } diff --git a/sys/fs/fuse/fuse_vnops.c b/sys/fs/fuse/fuse_vnops.c index 3384b7b84b3a..259925f54d9f 100644 --- a/sys/fs/fuse/fuse_vnops.c +++ b/sys/fs/fuse/fuse_vnops.c @@ -1,3132 +1,3125 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2007-2009 Google Inc. and Amit Singh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Copyright (C) 2005 Csaba Henk. * All rights reserved. * * Copyright (c) 2019 The FreeBSD Foundation * * Portions of this software were developed by BFF Storage Systems, LLC under * sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fuse.h" #include "fuse_file.h" #include "fuse_internal.h" #include "fuse_ipc.h" #include "fuse_node.h" #include "fuse_io.h" #include /* Maximum number of hardlinks to a single FUSE file */ #define FUSE_LINK_MAX UINT32_MAX SDT_PROVIDER_DECLARE(fusefs); /* * Fuse trace probe: * arg0: verbosity. Higher numbers give more verbose messages * arg1: Textual message */ SDT_PROBE_DEFINE2(fusefs, , vnops, trace, "int", "char*"); /* vnode ops */ static vop_access_t fuse_vnop_access; static vop_advlock_t fuse_vnop_advlock; static vop_allocate_t fuse_vnop_allocate; static vop_bmap_t fuse_vnop_bmap; static vop_close_t fuse_fifo_close; static vop_close_t fuse_vnop_close; static vop_copy_file_range_t fuse_vnop_copy_file_range; static vop_create_t fuse_vnop_create; static vop_deallocate_t fuse_vnop_deallocate; static vop_deleteextattr_t fuse_vnop_deleteextattr; static vop_fdatasync_t fuse_vnop_fdatasync; static vop_fsync_t fuse_vnop_fsync; static vop_getattr_t fuse_vnop_getattr; static vop_getextattr_t fuse_vnop_getextattr; static vop_inactive_t fuse_vnop_inactive; static vop_ioctl_t fuse_vnop_ioctl; static vop_link_t fuse_vnop_link; static vop_listextattr_t fuse_vnop_listextattr; static vop_lookup_t fuse_vnop_lookup; static vop_mkdir_t fuse_vnop_mkdir; static vop_mknod_t fuse_vnop_mknod; static vop_open_t fuse_vnop_open; static vop_pathconf_t fuse_vnop_pathconf; static vop_read_t fuse_vnop_read; static vop_readdir_t fuse_vnop_readdir; static vop_readlink_t fuse_vnop_readlink; static vop_reclaim_t fuse_vnop_reclaim; static vop_remove_t fuse_vnop_remove; static vop_rename_t fuse_vnop_rename; static vop_rmdir_t fuse_vnop_rmdir; static vop_setattr_t fuse_vnop_setattr; static vop_setextattr_t fuse_vnop_setextattr; static vop_strategy_t fuse_vnop_strategy; static vop_symlink_t fuse_vnop_symlink; static vop_write_t fuse_vnop_write; static vop_getpages_t fuse_vnop_getpages; static vop_print_t fuse_vnop_print; static vop_vptofh_t fuse_vnop_vptofh; struct vop_vector fuse_fifoops = { .vop_default = &fifo_specops, .vop_access = fuse_vnop_access, .vop_close = fuse_fifo_close, .vop_fsync = fuse_vnop_fsync, .vop_getattr = fuse_vnop_getattr, .vop_inactive = fuse_vnop_inactive, .vop_pathconf = fuse_vnop_pathconf, .vop_print = fuse_vnop_print, .vop_read = VOP_PANIC, .vop_reclaim = fuse_vnop_reclaim, .vop_setattr = fuse_vnop_setattr, .vop_write = VOP_PANIC, .vop_vptofh = fuse_vnop_vptofh, }; VFS_VOP_VECTOR_REGISTER(fuse_fifoops); struct vop_vector fuse_vnops = { .vop_allocate = fuse_vnop_allocate, .vop_default = &default_vnodeops, .vop_access = fuse_vnop_access, .vop_advlock = fuse_vnop_advlock, .vop_bmap = fuse_vnop_bmap, .vop_close = fuse_vnop_close, .vop_copy_file_range = fuse_vnop_copy_file_range, .vop_create = fuse_vnop_create, .vop_deallocate = fuse_vnop_deallocate, .vop_deleteextattr = fuse_vnop_deleteextattr, .vop_fsync = fuse_vnop_fsync, .vop_fdatasync = fuse_vnop_fdatasync, .vop_getattr = fuse_vnop_getattr, .vop_getextattr = fuse_vnop_getextattr, .vop_inactive = fuse_vnop_inactive, .vop_ioctl = fuse_vnop_ioctl, .vop_link = fuse_vnop_link, .vop_listextattr = fuse_vnop_listextattr, .vop_lookup = fuse_vnop_lookup, .vop_mkdir = fuse_vnop_mkdir, .vop_mknod = fuse_vnop_mknod, .vop_open = fuse_vnop_open, .vop_pathconf = fuse_vnop_pathconf, /* * TODO: implement vop_poll after upgrading to protocol 7.21. * FUSE_POLL was added in protocol 7.11, but it's kind of broken until * 7.21, which adds the ability for the client to choose which poll * events it wants, and for a client to deregister a file handle */ .vop_read = fuse_vnop_read, .vop_readdir = fuse_vnop_readdir, .vop_readlink = fuse_vnop_readlink, .vop_reclaim = fuse_vnop_reclaim, .vop_remove = fuse_vnop_remove, .vop_rename = fuse_vnop_rename, .vop_rmdir = fuse_vnop_rmdir, .vop_setattr = fuse_vnop_setattr, .vop_setextattr = fuse_vnop_setextattr, .vop_strategy = fuse_vnop_strategy, .vop_symlink = fuse_vnop_symlink, .vop_write = fuse_vnop_write, .vop_getpages = fuse_vnop_getpages, .vop_print = fuse_vnop_print, .vop_vptofh = fuse_vnop_vptofh, }; VFS_VOP_VECTOR_REGISTER(fuse_vnops); uma_zone_t fuse_pbuf_zone; /* Check permission for extattr operations, much like extattr_check_cred */ static int fuse_extattr_check_cred(struct vnode *vp, int ns, struct ucred *cred, struct thread *td, accmode_t accmode) { struct mount *mp = vnode_mount(vp); struct fuse_data *data = fuse_get_mpdata(mp); int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS; /* * Kernel-invoked always succeeds. */ if (cred == NOCRED) return (0); /* * Do not allow privileged processes in jail to directly manipulate * system attributes. */ switch (ns) { case EXTATTR_NAMESPACE_SYSTEM: if (default_permissions) { return (priv_check_cred(cred, PRIV_VFS_EXTATTR_SYSTEM)); } return (0); case EXTATTR_NAMESPACE_USER: if (default_permissions) { return (fuse_internal_access(vp, accmode, td, cred)); } return (0); default: return (EPERM); } } /* Get a filehandle for a directory */ static int fuse_filehandle_get_dir(struct vnode *vp, struct fuse_filehandle **fufhp, struct ucred *cred, pid_t pid) { if (fuse_filehandle_get(vp, FREAD, fufhp, cred, pid) == 0) return 0; return fuse_filehandle_get(vp, FEXEC, fufhp, cred, pid); } /* Send FUSE_FLUSH for this vnode */ static int fuse_flush(struct vnode *vp, struct ucred *cred, pid_t pid, int fflag) { struct fuse_flush_in *ffi; struct fuse_filehandle *fufh; struct fuse_dispatcher fdi; struct thread *td = curthread; struct mount *mp = vnode_mount(vp); int err; if (fsess_not_impl(vnode_mount(vp), FUSE_FLUSH)) return 0; err = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid); if (err) return err; fdisp_init(&fdi, sizeof(*ffi)); fdisp_make_vp(&fdi, FUSE_FLUSH, vp, td, cred); ffi = fdi.indata; ffi->fh = fufh->fh_id; /* * If the file has a POSIX lock then we're supposed to set lock_owner. * If not, then lock_owner is undefined. So we may as well always set * it. */ ffi->lock_owner = td->td_proc->p_pid; err = fdisp_wait_answ(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_FLUSH); err = 0; } fdisp_destroy(&fdi); return err; } /* Close wrapper for fifos. */ static int fuse_fifo_close(struct vop_close_args *ap) { return (fifo_specops.vop_close(ap)); } /* Invalidate a range of cached data, whether dirty of not */ static int fuse_inval_buf_range(struct vnode *vp, off_t filesize, off_t start, off_t end) { struct buf *bp; daddr_t left_lbn, end_lbn, right_lbn; off_t new_filesize; int iosize, left_on, right_on, right_blksize; iosize = fuse_iosize(vp); left_lbn = start / iosize; end_lbn = howmany(end, iosize); left_on = start & (iosize - 1); if (left_on != 0) { bp = getblk(vp, left_lbn, iosize, PCATCH, 0, 0); if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyend >= left_on) { /* * Flush the dirty buffer, because we don't have a * byte-granular way to record which parts of the * buffer are valid. */ bwrite(bp); if (bp->b_error) return (bp->b_error); } else { brelse(bp); } } right_on = end & (iosize - 1); if (right_on != 0) { right_lbn = end / iosize; new_filesize = MAX(filesize, end); right_blksize = MIN(iosize, new_filesize - iosize * right_lbn); bp = getblk(vp, right_lbn, right_blksize, PCATCH, 0, 0); if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyoff < right_on) { /* * Flush the dirty buffer, because we don't have a * byte-granular way to record which parts of the * buffer are valid. */ bwrite(bp); if (bp->b_error) return (bp->b_error); } else { brelse(bp); } } v_inval_buf_range(vp, left_lbn, end_lbn, iosize); return (0); } /* Send FUSE_LSEEK for this node */ static int fuse_vnop_do_lseek(struct vnode *vp, struct thread *td, struct ucred *cred, pid_t pid, off_t *offp, int whence) { struct fuse_dispatcher fdi; struct fuse_filehandle *fufh; struct fuse_lseek_in *flsi; struct fuse_lseek_out *flso; struct mount *mp = vnode_mount(vp); int err; ASSERT_VOP_LOCKED(vp, __func__); err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid); if (err) return (err); fdisp_init(&fdi, sizeof(*flsi)); fdisp_make_vp(&fdi, FUSE_LSEEK, vp, td, cred); flsi = fdi.indata; flsi->fh = fufh->fh_id; flsi->offset = *offp; flsi->whence = whence; err = fdisp_wait_answ(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_LSEEK); } else if (err == 0) { fsess_set_impl(mp, FUSE_LSEEK); flso = fdi.answ; *offp = flso->offset; } fdisp_destroy(&fdi); 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_data *data = fuse_get_mpdata(vnode_mount(vp)); int err; 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) || (fuse_match_cred(data->daemoncred, cred) == 0)) { return 0; } } return EBADF; } if (vnode_islnk(vp)) { return 0; } err = fuse_internal_access(vp, accmode, ap->a_td, ap->a_cred); return err; } /* * struct vop_advlock_args { * struct vop_generic_args a_gen; * struct vnode *a_vp; * void *a_id; * int a_op; * struct flock *a_fl; * int a_flags; * } */ static int fuse_vnop_advlock(struct vop_advlock_args *ap) { struct vnode *vp = ap->a_vp; struct flock *fl = ap->a_fl; struct thread *td = curthread; struct ucred *cred = td->td_ucred; pid_t pid = td->td_proc->p_pid; struct fuse_filehandle *fufh; struct fuse_dispatcher fdi; struct fuse_lk_in *fli; struct fuse_lk_out *flo; enum fuse_opcode op; int dataflags, err; int flags = ap->a_flags; dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags; if (fuse_isdeadfs(vp)) { return ENXIO; } switch(ap->a_op) { case F_GETLK: op = FUSE_GETLK; break; case F_SETLK: if (flags & F_WAIT) op = FUSE_SETLKW; else op = FUSE_SETLK; break; case F_UNLCK: op = FUSE_SETLK; break; default: return EINVAL; } if (!(dataflags & FSESS_POSIX_LOCKS)) return vop_stdadvlock(ap); /* FUSE doesn't properly support flock until protocol 7.17 */ if (flags & F_FLOCK) return vop_stdadvlock(ap); vn_lock(vp, LK_SHARED | LK_RETRY); err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid); if (err) goto out; fdisp_init(&fdi, sizeof(*fli)); fdisp_make_vp(&fdi, op, vp, td, cred); fli = fdi.indata; fli->fh = fufh->fh_id; fli->owner = td->td_proc->p_pid; fli->lk.start = fl->l_start; if (fl->l_len != 0) fli->lk.end = fl->l_start + fl->l_len - 1; else fli->lk.end = INT64_MAX; fli->lk.type = fl->l_type; fli->lk.pid = td->td_proc->p_pid; err = fdisp_wait_answ(&fdi); fdisp_destroy(&fdi); if (err == 0 && op == FUSE_GETLK) { flo = fdi.answ; fl->l_type = flo->lk.type; fl->l_pid = flo->lk.pid; if (flo->lk.type != F_UNLCK) { fl->l_start = flo->lk.start; if (flo->lk.end == INT64_MAX) fl->l_len = 0; else fl->l_len = flo->lk.end - flo->lk.start + 1; fl->l_start = flo->lk.start; } } out: VOP_UNLOCK(vp); return err; } static int fuse_vnop_allocate(struct vop_allocate_args *ap) { struct vnode *vp = ap->a_vp; off_t *len = ap->a_len; off_t *offset = ap->a_offset; struct ucred *cred = ap->a_cred; struct fuse_filehandle *fufh; struct mount *mp = vnode_mount(vp); struct fuse_dispatcher fdi; struct fuse_fallocate_in *ffi; struct uio io; pid_t pid = curthread->td_proc->p_pid; struct fuse_vnode_data *fvdat = VTOFUD(vp); off_t filesize; int err; if (fuse_isdeadfs(vp)) return (ENXIO); switch (vp->v_type) { case VFIFO: return (ESPIPE); case VLNK: case VREG: if (vfs_isrdonly(mp)) return (EROFS); break; default: return (ENODEV); } if (vfs_isrdonly(mp)) return (EROFS); if (fsess_not_impl(mp, FUSE_FALLOCATE)) return (EINVAL); io.uio_offset = *offset; io.uio_resid = *len; err = vn_rlimit_fsize(vp, &io, curthread); if (err) return (err); err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); if (err) return (err); fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE); err = fuse_vnode_size(vp, &filesize, cred, curthread); if (err) return (err); fuse_inval_buf_range(vp, filesize, *offset, *offset + *len); fdisp_init(&fdi, sizeof(*ffi)); fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred); ffi = fdi.indata; ffi->fh = fufh->fh_id; ffi->offset = *offset; ffi->length = *len; ffi->mode = 0; err = fdisp_wait_answ(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_FALLOCATE); err = EINVAL; } else if (err == EOPNOTSUPP) { /* * The file system server does not support FUSE_FALLOCATE with * the supplied mode for this particular file. */ err = EINVAL; } else if (!err) { *offset += *len; *len = 0; fuse_vnode_undirty_cached_timestamps(vp, false); fuse_internal_clear_suid_on_write(vp, cred, curthread); if (*offset > fvdat->cached_attrs.va_size) { fuse_vnode_setsize(vp, *offset, false); getnanouptime(&fvdat->last_local_modify); } } return (err); } /* { struct vnode *a_vp; daddr_t a_bn; struct bufobj **a_bop; daddr_t *a_bnp; int *a_runp; int *a_runb; } */ static int fuse_vnop_bmap(struct vop_bmap_args *ap) { struct vnode *vp = ap->a_vp; struct bufobj **bo = ap->a_bop; struct thread *td = curthread; struct mount *mp; struct fuse_dispatcher fdi; struct fuse_bmap_in *fbi; struct fuse_bmap_out *fbo; struct fuse_data *data; struct fuse_vnode_data *fvdat = VTOFUD(vp); uint64_t biosize; off_t fsize; daddr_t lbn = ap->a_bn; daddr_t *pbn = ap->a_bnp; int *runp = ap->a_runp; int *runb = ap->a_runb; int error = 0; int maxrun; if (fuse_isdeadfs(vp)) { return ENXIO; } mp = vnode_mount(vp); data = fuse_get_mpdata(mp); biosize = fuse_iosize(vp); maxrun = MIN(vp->v_mount->mnt_iosize_max / biosize - 1, data->max_readahead_blocks); if (bo != NULL) *bo = &vp->v_bufobj; /* * The FUSE_BMAP operation does not include the runp and runb * variables, so we must guess. Report nonzero contiguous runs so * cluster_read will combine adjacent reads. It's worthwhile to reduce * upcalls even if we don't know the true physical layout of the file. * * FUSE file systems may opt out of read clustering in two ways: * * mounting with -onoclusterr * * Setting max_readahead <= maxbcachebuf during FUSE_INIT */ if (runb != NULL) *runb = MIN(lbn, maxrun); if (runp != NULL && maxrun == 0) *runp = 0; else if (runp != NULL) { /* * If the file's size is cached, use that value to calculate * runp, even if the cache is expired. runp is only advisory, * and the risk of getting it wrong is not worth the cost of * another upcall. */ if (fvdat->cached_attrs.va_size != VNOVAL) fsize = fvdat->cached_attrs.va_size; else error = fuse_vnode_size(vp, &fsize, td->td_ucred, td); if (error == 0) *runp = MIN(MAX(0, fsize / (off_t)biosize - lbn - 1), maxrun); else *runp = 0; } if (fsess_maybe_impl(mp, FUSE_BMAP)) { fdisp_init(&fdi, sizeof(*fbi)); fdisp_make_vp(&fdi, FUSE_BMAP, vp, td, td->td_ucred); fbi = fdi.indata; fbi->block = lbn; fbi->blocksize = biosize; error = fdisp_wait_answ(&fdi); if (error == ENOSYS) { fdisp_destroy(&fdi); fsess_set_notimpl(mp, FUSE_BMAP); error = 0; } else { fbo = fdi.answ; if (error == 0 && pbn != NULL) *pbn = fbo->block; fdisp_destroy(&fdi); return error; } } /* If the daemon doesn't support BMAP, make up a sensible default */ if (pbn != NULL) *pbn = lbn * btodb(biosize); return (error); } /* struct vop_close_args { struct vnode *a_vp; int a_fflag; struct ucred *a_cred; struct thread *a_td; }; */ static int fuse_vnop_close(struct vop_close_args *ap) { struct vnode *vp = ap->a_vp; struct ucred *cred = ap->a_cred; int fflag = ap->a_fflag; struct thread *td = ap->a_td; pid_t pid = td->td_proc->p_pid; struct fuse_vnode_data *fvdat = VTOFUD(vp); int err = 0; if (fuse_isdeadfs(vp)) return 0; if (vnode_isdir(vp)) return 0; if (fflag & IO_NDELAY) return 0; err = fuse_flush(vp, cred, pid, fflag); if (err == 0 && (fvdat->flag & FN_ATIMECHANGE)) { struct vattr vap; VATTR_NULL(&vap); vap.va_atime = fvdat->cached_attrs.va_atime; err = fuse_internal_setattr(vp, &vap, td, NULL); } /* TODO: close the file handle, if we're sure it's no longer used */ if ((fvdat->flag & FN_SIZECHANGE) != 0) { fuse_vnode_savesize(vp, cred, td->td_proc->p_pid); } return err; } /* struct vop_copy_file_range_args { struct vop_generic_args a_gen; struct vnode *a_invp; off_t *a_inoffp; struct vnode *a_outvp; off_t *a_outoffp; size_t *a_lenp; unsigned int a_flags; struct ucred *a_incred; struct ucred *a_outcred; struct thread *a_fsizetd; } */ static int fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap) { struct vnode *invp = ap->a_invp; struct vnode *outvp = ap->a_outvp; struct mount *mp = vnode_mount(invp); struct fuse_vnode_data *outfvdat = VTOFUD(outvp); struct fuse_dispatcher fdi; struct fuse_filehandle *infufh, *outfufh; struct fuse_copy_file_range_in *fcfri; struct ucred *incred = ap->a_incred; struct ucred *outcred = ap->a_outcred; struct fuse_write_out *fwo; struct thread *td; struct uio io; off_t outfilesize; pid_t pid; int err; if (mp != vnode_mount(outvp)) goto fallback; if (incred->cr_uid != outcred->cr_uid) goto fallback; if (incred->cr_groups[0] != outcred->cr_groups[0]) goto fallback; if (fsess_not_impl(mp, FUSE_COPY_FILE_RANGE)) goto fallback; if (ap->a_fsizetd == NULL) td = curthread; else td = ap->a_fsizetd; pid = td->td_proc->p_pid; /* Lock both vnodes, avoiding risk of deadlock. */ do { err = vn_lock(outvp, LK_EXCLUSIVE); if (invp == outvp) break; if (err == 0) { err = vn_lock(invp, LK_SHARED | LK_NOWAIT); if (err == 0) break; VOP_UNLOCK(outvp); err = vn_lock(invp, LK_SHARED); if (err == 0) VOP_UNLOCK(invp); } } while (err == 0); if (err != 0) return (err); err = fuse_filehandle_getrw(invp, FREAD, &infufh, incred, pid); if (err) goto unlock; err = fuse_filehandle_getrw(outvp, FWRITE, &outfufh, outcred, pid); if (err) goto unlock; if (ap->a_fsizetd) { io.uio_offset = *ap->a_outoffp; io.uio_resid = *ap->a_lenp; err = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd); if (err) goto unlock; } err = fuse_vnode_size(outvp, &outfilesize, outcred, curthread); if (err) goto unlock; err = fuse_inval_buf_range(outvp, outfilesize, *ap->a_outoffp, *ap->a_outoffp + *ap->a_lenp); if (err) goto unlock; fdisp_init(&fdi, sizeof(*fcfri)); fdisp_make_vp(&fdi, FUSE_COPY_FILE_RANGE, invp, td, incred); fcfri = fdi.indata; fcfri->fh_in = infufh->fh_id; fcfri->off_in = *ap->a_inoffp; fcfri->nodeid_out = VTOI(outvp); fcfri->fh_out = outfufh->fh_id; fcfri->off_out = *ap->a_outoffp; fcfri->len = *ap->a_lenp; fcfri->flags = 0; err = fdisp_wait_answ(&fdi); if (err == 0) { fwo = fdi.answ; *ap->a_lenp = fwo->size; *ap->a_inoffp += fwo->size; *ap->a_outoffp += fwo->size; fuse_internal_clear_suid_on_write(outvp, outcred, td); if (*ap->a_outoffp > outfvdat->cached_attrs.va_size) { fuse_vnode_setsize(outvp, *ap->a_outoffp, false); getnanouptime(&outfvdat->last_local_modify); } fuse_vnode_update(invp, FN_ATIMECHANGE); fuse_vnode_update(outvp, FN_MTIMECHANGE | FN_CTIMECHANGE); } fdisp_destroy(&fdi); unlock: if (invp != outvp) VOP_UNLOCK(invp); VOP_UNLOCK(outvp); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_COPY_FILE_RANGE); fallback: err = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred, ap->a_outcred, ap->a_fsizetd); } return (err); } static void fdisp_make_mknod_for_fallback( struct fuse_dispatcher *fdip, struct componentname *cnp, struct vnode *dvp, uint64_t parentnid, struct thread *td, struct ucred *cred, mode_t mode, enum fuse_opcode *op) { struct fuse_mknod_in *fmni; fdisp_init(fdip, sizeof(*fmni) + cnp->cn_namelen + 1); *op = FUSE_MKNOD; fdisp_make(fdip, *op, vnode_mount(dvp), parentnid, td, cred); fmni = fdip->indata; fmni->mode = mode; fmni->rdev = 0; memcpy((char *)fdip->indata + sizeof(*fmni), cnp->cn_nameptr, cnp->cn_namelen); ((char *)fdip->indata)[sizeof(*fmni) + cnp->cn_namelen] = '\0'; } /* struct vnop_create_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; }; */ static int fuse_vnop_create(struct vop_create_args *ap) { struct vnode *dvp = ap->a_dvp; struct vnode **vpp = ap->a_vpp; struct componentname *cnp = ap->a_cnp; struct vattr *vap = ap->a_vap; struct thread *td = curthread; struct ucred *cred = cnp->cn_cred; struct fuse_data *data; struct fuse_create_in *fci; struct fuse_entry_out *feo; struct fuse_open_out *foo; struct fuse_dispatcher fdi, fdi2; struct fuse_dispatcher *fdip = &fdi; struct fuse_dispatcher *fdip2 = NULL; int err; struct mount *mp = vnode_mount(dvp); data = fuse_get_mpdata(mp); uint64_t parentnid = VTOFUD(dvp)->nid; mode_t mode = MAKEIMODE(vap->va_type, vap->va_mode); enum fuse_opcode op; int flags; if (fuse_isdeadfs(dvp)) return ENXIO; /* FUSE expects sockets to be created with FUSE_MKNOD */ if (vap->va_type == VSOCK) return fuse_internal_mknod(dvp, vpp, cnp, vap); /* * VOP_CREATE doesn't tell us the open(2) flags, so we guess. Only a * writable mode makes sense, and we might as well include readability * too. */ flags = O_RDWR; bzero(&fdi, sizeof(fdi)); if (vap->va_type != VREG) return (EINVAL); if (fsess_not_impl(mp, FUSE_CREATE) || vap->va_type == VSOCK) { /* Fallback to FUSE_MKNOD/FUSE_OPEN */ fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td, cred, mode, &op); } else { /* Use FUSE_CREATE */ size_t insize; op = FUSE_CREATE; fdisp_init(fdip, sizeof(*fci) + cnp->cn_namelen + 1); fdisp_make(fdip, op, vnode_mount(dvp), parentnid, td, cred); fci = fdip->indata; fci->mode = mode; fci->flags = O_CREAT | flags; if (fuse_libabi_geq(data, 7, 12)) { insize = sizeof(*fci); fci->umask = td->td_proc->p_pd->pd_cmask; } else { insize = sizeof(struct fuse_open_in); } memcpy((char *)fdip->indata + insize, cnp->cn_nameptr, cnp->cn_namelen); ((char *)fdip->indata)[insize + cnp->cn_namelen] = '\0'; } err = fdisp_wait_answ(fdip); if (err) { if (err == ENOSYS && op == FUSE_CREATE) { fsess_set_notimpl(mp, FUSE_CREATE); fdisp_destroy(fdip); fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td, cred, mode, &op); err = fdisp_wait_answ(fdip); } if (err) goto out; } feo = fdip->answ; if ((err = fuse_internal_checkentry(feo, vap->va_type))) { goto out; } if (op == FUSE_CREATE) { foo = (struct fuse_open_out*)(feo + 1); } else { /* Issue a separate FUSE_OPEN */ struct fuse_open_in *foi; fdip2 = &fdi2; fdisp_init(fdip2, sizeof(*foi)); fdisp_make(fdip2, FUSE_OPEN, vnode_mount(dvp), feo->nodeid, td, cred); foi = fdip2->indata; foi->flags = flags; err = fdisp_wait_answ(fdip2); if (err) goto out; foo = fdip2->answ; } err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vap->va_type); if (err) { struct fuse_release_in *fri; uint64_t nodeid = feo->nodeid; uint64_t fh_id = foo->fh; fdisp_init(fdip, sizeof(*fri)); fdisp_make(fdip, FUSE_RELEASE, mp, nodeid, td, cred); fri = fdip->indata; fri->fh = fh_id; fri->flags = flags; fuse_insert_callback(fdip->tick, fuse_internal_forget_callback); fuse_insert_message(fdip->tick, false); goto out; } ASSERT_VOP_ELOCKED(*vpp, "fuse_vnop_create"); fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid, feo->attr_valid_nsec, NULL, true); fuse_filehandle_init(*vpp, FUFH_RDWR, NULL, td, cred, foo); fuse_vnode_open(*vpp, foo->open_flags, td); /* * Purge the parent's attribute cache because the daemon should've * updated its mtime and ctime */ fuse_vnode_clear_attr_cache(dvp); cache_purge_negative(dvp); out: if (fdip2) fdisp_destroy(fdip2); fdisp_destroy(fdip); return err; } /* struct vnop_fdatasync_args { struct vop_generic_args a_gen; struct vnode * a_vp; struct thread * a_td; }; */ static int fuse_vnop_fdatasync(struct vop_fdatasync_args *ap) { struct vnode *vp = ap->a_vp; struct thread *td = ap->a_td; int waitfor = MNT_WAIT; int err = 0; if (fuse_isdeadfs(vp)) { return 0; } if ((err = vop_stdfdatasync_buf(ap))) return err; return fuse_internal_fsync(vp, td, waitfor, true); } /* struct vnop_fsync_args { struct vop_generic_args a_gen; struct vnode * a_vp; int a_waitfor; struct thread * a_td; }; */ static int fuse_vnop_fsync(struct vop_fsync_args *ap) { struct vnode *vp = ap->a_vp; struct thread *td = ap->a_td; int waitfor = ap->a_waitfor; int err = 0; if (fuse_isdeadfs(vp)) { return 0; } if ((err = vop_stdfsync(ap))) return err; return fuse_internal_fsync(vp, td, waitfor, false); } /* 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; int err = 0; int dataflags; 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; return err; } else { goto fake; } } err = fuse_internal_getattr(vp, vap, cred, td); if (err == ENOTCONN && vnode_isvroot(vp)) { /* see comment in fuse_vfsop_statfs() */ goto fake; } else { return err; } fake: bzero(vap, sizeof(*vap)); vap->va_type = vnode_vtype(vp); return 0; } /* struct vnop_inactive_args { struct vnode *a_vp; }; */ static int fuse_vnop_inactive(struct vop_inactive_args *ap) { struct vnode *vp = ap->a_vp; struct thread *td = curthread; struct fuse_vnode_data *fvdat = VTOFUD(vp); struct fuse_filehandle *fufh, *fufh_tmp; int need_flush = 1; LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) { if (need_flush && vp->v_type == VREG) { if ((VTOFUD(vp)->flag & FN_SIZECHANGE) != 0) { fuse_vnode_savesize(vp, NULL, 0); } if ((fvdat->flag & FN_REVOKED) != 0) fuse_io_invalbuf(vp, td); else fuse_io_flushbuf(vp, MNT_WAIT, td); need_flush = 0; } fuse_filehandle_close(vp, fufh, td, NULL); } if ((fvdat->flag & FN_REVOKED) != 0) vrecycle(vp); return 0; } /* struct vnop_ioctl_args { struct vnode *a_vp; u_long a_command; caddr_t a_data; int a_fflag; struct ucred *a_cred; struct thread *a_td; }; */ static int fuse_vnop_ioctl(struct vop_ioctl_args *ap) { struct vnode *vp = ap->a_vp; struct mount *mp = vnode_mount(vp); struct ucred *cred = ap->a_cred; off_t *offp; pid_t pid = ap->a_td->td_proc->p_pid; int err; switch (ap->a_command) { case FIOSEEKDATA: case FIOSEEKHOLE: /* Call FUSE_LSEEK, if we can, or fall back to vop_stdioctl */ if (fsess_maybe_impl(mp, FUSE_LSEEK)) { int whence; offp = ap->a_data; if (ap->a_command == FIOSEEKDATA) whence = SEEK_DATA; else whence = SEEK_HOLE; vn_lock(vp, LK_SHARED | LK_RETRY); err = fuse_vnop_do_lseek(vp, ap->a_td, cred, pid, offp, whence); VOP_UNLOCK(vp); } if (fsess_not_impl(mp, FUSE_LSEEK)) err = vop_stdioctl(ap); break; default: /* TODO: implement FUSE_IOCTL */ err = ENOTTY; break; } return (err); } /* struct vnop_link_args { struct vnode *a_tdvp; struct vnode *a_vp; struct componentname *a_cnp; }; */ static int fuse_vnop_link(struct vop_link_args *ap) { struct vnode *vp = ap->a_vp; struct vnode *tdvp = ap->a_tdvp; struct componentname *cnp = ap->a_cnp; struct vattr *vap = VTOVA(vp); struct fuse_dispatcher fdi; struct fuse_entry_out *feo; struct fuse_link_in fli; int err; if (fuse_isdeadfs(vp)) { return ENXIO; } if (vnode_mount(tdvp) != vnode_mount(vp)) { return EXDEV; } /* * This is a seatbelt check to protect naive userspace filesystems from * themselves and the limitations of the FUSE IPC protocol. If a * filesystem does not allow attribute caching, assume it is capable of * validating that nlink does not overflow. */ if (vap != NULL && vap->va_nlink >= FUSE_LINK_MAX) return EMLINK; fli.oldnodeid = VTOI(vp); fdisp_init(&fdi, 0); fuse_internal_newentry_makerequest(vnode_mount(tdvp), VTOI(tdvp), cnp, FUSE_LINK, &fli, sizeof(fli), &fdi); if ((err = fdisp_wait_answ(&fdi))) { goto out; } feo = fdi.answ; err = fuse_internal_checkentry(feo, vnode_vtype(vp)); if (!err) { /* * Purge the parent's attribute cache because the daemon * should've updated its mtime and ctime */ fuse_vnode_clear_attr_cache(tdvp); fuse_internal_cache_attrs(vp, &feo->attr, feo->attr_valid, feo->attr_valid_nsec, NULL, true); } out: fdisp_destroy(&fdi); return err; } struct fuse_lookup_alloc_arg { struct fuse_entry_out *feo; struct componentname *cnp; uint64_t nid; enum vtype vtyp; }; /* Callback for vn_get_ino */ static int fuse_lookup_alloc(struct mount *mp, void *arg, int lkflags, struct vnode **vpp) { struct fuse_lookup_alloc_arg *flaa = arg; return fuse_vnode_get(mp, flaa->feo, flaa->nid, NULL, vpp, flaa->cnp, flaa->vtyp); } SDT_PROBE_DEFINE3(fusefs, , vnops, cache_lookup, "int", "struct timespec*", "struct timespec*"); /* 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 = curthread; struct ucred *cred = cnp->cn_cred; struct timespec now; 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); struct fuse_data *data = fuse_get_mpdata(mp); int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS; int err = 0; int lookup_err = 0; struct vnode *vp = NULL; struct fuse_dispatcher fdi; bool did_lookup = false; struct fuse_entry_out *feo = NULL; enum vtype vtyp; /* vnode type of target */ - off_t filesize; /* filesize of target */ uint64_t nid; if (fuse_isdeadfs(dvp)) { *vpp = NULL; return ENXIO; } if (!vnode_isdir(dvp)) return ENOTDIR; if (islastcn && vfs_isrdonly(mp) && (nameiop != LOOKUP)) return EROFS; if ((cnp->cn_flags & NOEXECCHECK) != 0) cnp->cn_flags &= ~NOEXECCHECK; else if ((err = fuse_internal_access(dvp, VEXEC, td, cred))) return err; if ((flags & ISDOTDOT) && !(data->dataflags & FSESS_EXPORT_SUPPORT)) { if (!(VTOFUD(dvp)->flag & FN_PARENT_NID)) { /* * Since the file system doesn't support ".." lookups, * we have no way to find this entry. */ return ESTALE; } nid = VTOFUD(dvp)->parent_nid; if (nid == 0) return ENOENT; /* .. is obviously a directory */ vtyp = VDIR; - filesize = 0; } else if (cnp->cn_namelen == 1 && *(cnp->cn_nameptr) == '.') { nid = VTOI(dvp); /* . is obviously a directory */ vtyp = VDIR; - filesize = 0; } else { struct timespec timeout; int ncpticks; /* here to accomodate for API contract */ err = cache_lookup(dvp, vpp, cnp, &timeout, &ncpticks); getnanouptime(&now); SDT_PROBE3(fusefs, , vnops, cache_lookup, err, &timeout, &now); switch (err) { case -1: /* positive match */ if (timespeccmp(&timeout, &now, >)) { counter_u64_add(fuse_lookup_cache_hits, 1); } else { /* Cache timeout */ counter_u64_add(fuse_lookup_cache_misses, 1); bintime_clear( &VTOFUD(*vpp)->entry_cache_timeout); cache_purge(*vpp); if (dvp != *vpp) vput(*vpp); else vrele(*vpp); *vpp = NULL; break; } return 0; case 0: /* no match in cache */ counter_u64_add(fuse_lookup_cache_misses, 1); break; case ENOENT: /* negative match */ if (timespeccmp(&timeout, &now, <=)) { /* Cache timeout */ cache_purge_negative(dvp); break; } /* fall through */ default: return err; } fdisp_init(&fdi, cnp->cn_namelen + 1); fdisp_make(&fdi, FUSE_LOOKUP, mp, VTOI(dvp), td, cred); memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen); ((char *)fdi.indata)[cnp->cn_namelen] = '\0'; lookup_err = fdisp_wait_answ(&fdi); did_lookup = true; if (!lookup_err) { /* lookup call succeeded */ feo = (struct fuse_entry_out *)fdi.answ; nid = feo->nodeid; if (nid == 0) { /* zero nodeid means ENOENT and cache it */ struct timespec timeout; fdi.answ_stat = ENOENT; lookup_err = ENOENT; if (cnp->cn_flags & MAKEENTRY) { fuse_validity_2_timespec(feo, &timeout); /* Use the same entry_time for .. as for * the file itself. That doesn't honor * exactly what the fuse server tells * us, but to do otherwise would require * another cache lookup at this point. */ struct timespec *dtsp = NULL; cache_enter_time(dvp, *vpp, cnp, &timeout, dtsp); } } vtyp = IFTOVT(feo->attr.mode); - filesize = feo->attr.size; } if (lookup_err && (!fdi.answ_stat || lookup_err != ENOENT)) { fdisp_destroy(&fdi); return lookup_err; } } /* lookup_err, if non-zero, must be ENOENT at this point */ if (lookup_err) { /* Entry not found */ if ((nameiop == CREATE || nameiop == RENAME) && islastcn) { if (default_permissions) err = fuse_internal_access(dvp, VWRITE, td, cred); else err = 0; if (!err) { /* * Set the SAVENAME flag to hold onto the * pathname for use later in VOP_CREATE or * VOP_RENAME. */ cnp->cn_flags |= SAVENAME; err = EJUSTRETURN; } } else { err = ENOENT; } } else { /* Entry was found */ if (flags & ISDOTDOT) { struct fuse_lookup_alloc_arg flaa; flaa.nid = nid; flaa.feo = feo; flaa.cnp = cnp; flaa.vtyp = vtyp; err = vn_vget_ino_gen(dvp, fuse_lookup_alloc, &flaa, 0, &vp); *vpp = vp; } else if (nid == VTOI(dvp)) { vref(dvp); *vpp = dvp; } else { struct fuse_vnode_data *fvdat; err = fuse_vnode_get(vnode_mount(dvp), feo, nid, dvp, &vp, cnp, vtyp); if (err) goto out; *vpp = vp; fvdat = VTOFUD(vp); MPASS(feo != NULL); if (timespeccmp(&now, &fvdat->last_local_modify, >)) { /* * Attributes from the server are definitely * newer than the last attributes we sent to * the server, so cache them. */ fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid, feo->attr_valid_nsec, NULL, true); } fuse_validity_2_bintime(feo->entry_valid, feo->entry_valid_nsec, &fvdat->entry_cache_timeout); if ((nameiop == DELETE || nameiop == RENAME) && islastcn && default_permissions) { struct vattr dvattr; err = fuse_internal_access(dvp, VWRITE, td, cred); if (err != 0) goto out; /* * if the parent's sticky bit is set, check * whether we're allowed to remove the file. * Need to figure out the vnode locking to make * this work. */ fuse_internal_getattr(dvp, &dvattr, cred, td); if ((dvattr.va_mode & S_ISTXT) && fuse_internal_access(dvp, VADMIN, td, cred) && fuse_internal_access(*vpp, VADMIN, td, cred)) { err = EPERM; goto out; } } if (islastcn && ( (nameiop == DELETE) || (nameiop == RENAME && wantparent))) { cnp->cn_flags |= SAVENAME; } } } out: if (err) { if (vp != NULL && dvp != vp) vput(vp); else if (vp != NULL) vrele(vp); *vpp = NULL; } if (did_lookup) fdisp_destroy(&fdi); return err; } /* struct vnop_mkdir_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; }; */ static int fuse_vnop_mkdir(struct vop_mkdir_args *ap) { struct vnode *dvp = ap->a_dvp; struct vnode **vpp = ap->a_vpp; struct componentname *cnp = ap->a_cnp; struct vattr *vap = ap->a_vap; struct fuse_mkdir_in fmdi; if (fuse_isdeadfs(dvp)) { return ENXIO; } fmdi.mode = MAKEIMODE(vap->va_type, vap->va_mode); fmdi.umask = curthread->td_proc->p_pd->pd_cmask; return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKDIR, &fmdi, sizeof(fmdi), VDIR)); } /* struct vnop_mknod_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; }; */ static int fuse_vnop_mknod(struct vop_mknod_args *ap) { struct vnode *dvp = ap->a_dvp; struct vnode **vpp = ap->a_vpp; struct componentname *cnp = ap->a_cnp; struct vattr *vap = ap->a_vap; if (fuse_isdeadfs(dvp)) return ENXIO; return fuse_internal_mknod(dvp, vpp, cnp, vap); } /* struct vop_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 a_mode = ap->a_mode; struct thread *td = ap->a_td; struct ucred *cred = ap->a_cred; pid_t pid = td->td_proc->p_pid; - struct fuse_vnode_data *fvdat; if (fuse_isdeadfs(vp)) return ENXIO; if (vp->v_type == VCHR || vp->v_type == VBLK || vp->v_type == VFIFO) return (EOPNOTSUPP); if ((a_mode & (FREAD | FWRITE | FEXEC)) == 0) return EINVAL; - fvdat = VTOFUD(vp); - if (fuse_filehandle_validrw(vp, a_mode, cred, pid)) { fuse_vnode_open(vp, 0, td); return 0; } return fuse_filehandle_open(vp, a_mode, NULL, td, cred); } static int fuse_vnop_pathconf(struct vop_pathconf_args *ap) { struct vnode *vp = ap->a_vp; struct mount *mp; switch (ap->a_name) { case _PC_FILESIZEBITS: *ap->a_retval = 64; return (0); case _PC_NAME_MAX: *ap->a_retval = NAME_MAX; return (0); case _PC_LINK_MAX: *ap->a_retval = MIN(LONG_MAX, FUSE_LINK_MAX); return (0); case _PC_SYMLINK_MAX: *ap->a_retval = MAXPATHLEN; return (0); case _PC_NO_TRUNC: *ap->a_retval = 1; return (0); case _PC_MIN_HOLE_SIZE: /* * The FUSE protocol provides no mechanism for a server to * report _PC_MIN_HOLE_SIZE. It's a protocol bug. Instead, * return EINVAL if the server does not support FUSE_LSEEK, or * 1 if it does. */ mp = vnode_mount(vp); if (!fsess_is_impl(mp, FUSE_LSEEK) && !fsess_not_impl(mp, FUSE_LSEEK)) { off_t offset = 0; /* Issue a FUSE_LSEEK to find out if it's implemented */ fuse_vnop_do_lseek(vp, curthread, curthread->td_ucred, curthread->td_proc->p_pid, &offset, SEEK_DATA); } if (fsess_is_impl(mp, FUSE_LSEEK)) { *ap->a_retval = 1; return (0); } else { /* * Probably FUSE_LSEEK is not implemented. It might * be, if the FUSE_LSEEK above returned an error like * EACCES, but in that case we can't tell, so it's * safest to report EINVAL anyway. */ return (EINVAL); } default: return (vop_stdpathconf(ap)); } } SDT_PROBE_DEFINE3(fusefs, , vnops, filehandles_closed, "struct vnode*", "struct uio*", "struct ucred*"); /* 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; pid_t pid = curthread->td_proc->p_pid; struct fuse_filehandle *fufh; int err; bool closefufh = false, directio; MPASS(vp->v_type == VREG || vp->v_type == VDIR); if (fuse_isdeadfs(vp)) { return ENXIO; } if (VTOFUD(vp)->flag & FN_DIRECTIO) { ioflag |= IO_DIRECT; } err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid); if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { /* * nfsd will do I/O without first doing VOP_OPEN. We * must implicitly open the file here */ err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred); closefufh = true; } if (err) { SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred); 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)); fuse_vnode_update(vp, FN_ATIMECHANGE); if (directio) { SDT_PROBE2(fusefs, , vnops, trace, 1, "direct read of vnode"); err = fuse_read_directbackend(vp, uio, cred, fufh); } else { SDT_PROBE2(fusefs, , vnops, trace, 1, "buffered read of vnode"); err = fuse_read_biobackend(vp, uio, ioflag, cred, fufh, pid); } if (closefufh) fuse_filehandle_close(vp, fufh, curthread, cred); return (err); } /* struct vnop_readdir_args { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; int *a_ncookies; uint64_t **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_iov cookediov; int err = 0; uint64_t *cookies; off_t startoff; ssize_t tresid; int ncookies; bool closefufh = false; pid_t pid = curthread->td_proc->p_pid; if (ap->a_eofflag) *ap->a_eofflag = 0; if (fuse_isdeadfs(vp)) { return ENXIO; } if ( /* XXXIP ((uio_iovcnt(uio) > 1)) || */ (uio_resid(uio) < sizeof(struct dirent))) { return EINVAL; } tresid = uio->uio_resid; startoff = uio->uio_offset; err = fuse_filehandle_get_dir(vp, &fufh, cred, pid); if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { /* * nfsd will do VOP_READDIR without first doing VOP_OPEN. We * must implicitly open the directory here */ err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred); if (err == 0) { /* * When a directory is opened, it must be read from * the beginning. Hopefully, the "startoff" still * exists as an offset cookie for the directory. * If not, it will read the entire directory without * returning any entries and just return eof. */ uio->uio_offset = 0; } closefufh = true; } if (err) return (err); if (ap->a_ncookies != NULL) { ncookies = uio->uio_resid / (offsetof(struct dirent, d_name) + 4) + 1; cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK); *ap->a_ncookies = ncookies; *ap->a_cookies = cookies; } else { ncookies = 0; cookies = NULL; } #define DIRCOOKEDSIZE FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + MAXNAMLEN + 1) fiov_init(&cookediov, DIRCOOKEDSIZE); err = fuse_internal_readdir(vp, uio, startoff, fufh, &cookediov, &ncookies, cookies); fiov_teardown(&cookediov); if (closefufh) fuse_filehandle_close(vp, fufh, curthread, cred); if (ap->a_ncookies != NULL) { if (err == 0) { *ap->a_ncookies -= ncookies; } else { free(*ap->a_cookies, M_TEMP); *ap->a_ncookies = 0; *ap->a_cookies = NULL; } } if (err == 0 && tresid == uio->uio_resid) *ap->a_eofflag = 1; return err; } /* 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; 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; } /* struct vnop_reclaim_args { struct vnode *a_vp; }; */ static int fuse_vnop_reclaim(struct vop_reclaim_args *ap) { struct vnode *vp = ap->a_vp; struct thread *td = curthread; struct fuse_vnode_data *fvdat = VTOFUD(vp); struct fuse_filehandle *fufh, *fufh_tmp; if (!fvdat) { panic("FUSE: no vnode data during recycling"); } LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) { printf("FUSE: vnode being reclaimed with open fufh " "(type=%#x)", fufh->fufh_type); fuse_filehandle_close(vp, fufh, td, NULL); } if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) { fuse_internal_forget_send(vnode_mount(vp), td, NULL, VTOI(vp), fvdat->nlookup); } cache_purge(vp); vfs_hash_remove(vp); fuse_vnode_destroy(vp); return 0; } /* 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; if (fuse_isdeadfs(vp)) { return ENXIO; } if (vnode_isdir(vp)) { return EPERM; } err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK); 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; bool newparent = fdvp != tdvp; bool isdir = fvp->v_type == VDIR; int err = 0; if (fuse_isdeadfs(fdvp)) { return ENXIO; } if (fvp->v_mount != tdvp->v_mount || (tvp && fvp->v_mount != tvp->v_mount)) { SDT_PROBE2(fusefs, , vnops, trace, 1, "cross-device rename"); 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. */ /* * If source is a directory, and it will get a new parent, user must * have write permission to it, so ".." can be modified. */ data = fuse_get_mpdata(vnode_mount(tdvp)); if (data->dataflags & FSESS_DEFAULT_PERMISSIONS && isdir && newparent) { err = fuse_internal_access(fvp, VWRITE, curthread, tcnp->cn_cred); if (err) goto out; } 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; } /* 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; if (fuse_isdeadfs(vp)) { return ENXIO; } if (VTOFUD(vp) == VTOFUD(dvp)) { return EINVAL; } err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR); return err; } /* 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 mount *mp; struct fuse_data *data; struct vattr old_va; int dataflags; int err = 0, err2; accmode_t accmode = 0; bool checkperm; bool drop_suid = false; gid_t cr_gid; mp = vnode_mount(vp); data = fuse_get_mpdata(mp); dataflags = data->dataflags; checkperm = dataflags & FSESS_DEFAULT_PERMISSIONS; if (cred->cr_ngroups > 0) cr_gid = cred->cr_groups[0]; else cr_gid = 0; if (fuse_isdeadfs(vp)) { return ENXIO; } if (vap->va_uid != (uid_t)VNOVAL) { if (checkperm) { /* Only root may change a file's owner */ err = priv_check_cred(cred, PRIV_VFS_CHOWN); if (err) { /* As a special case, allow the null chown */ err2 = fuse_internal_getattr(vp, &old_va, cred, td); if (err2) return (err2); if (vap->va_uid != old_va.va_uid) return err; else accmode |= VADMIN; drop_suid = true; } else accmode |= VADMIN; } else accmode |= VADMIN; } if (vap->va_gid != (gid_t)VNOVAL) { if (checkperm && priv_check_cred(cred, PRIV_VFS_CHOWN)) drop_suid = true; if (checkperm && !groupmember(vap->va_gid, cred)) { /* * Non-root users may only chgrp to one of their own * groups */ err = priv_check_cred(cred, PRIV_VFS_CHOWN); if (err) { /* As a special case, allow the null chgrp */ err2 = fuse_internal_getattr(vp, &old_va, cred, td); if (err2) return (err2); if (vap->va_gid != old_va.va_gid) return err; accmode |= VADMIN; } else accmode |= VADMIN; } else accmode |= VADMIN; } if (vap->va_size != VNOVAL) { switch (vp->v_type) { case VDIR: return (EISDIR); case VLNK: case VREG: if (vfs_isrdonly(mp)) return (EROFS); break; default: /* * According to POSIX, the result is unspecified * for file types other than regular files, * directories and shared memory objects. We * don't support shared memory objects in the file * system, and have dubious support for truncating * symlinks. Just ignore the request in other cases. */ return (0); } /* Don't set accmode. Permission to trunc is checked upstack */ } if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { if (vap->va_vaflags & VA_UTIMES_NULL) accmode |= VWRITE; else accmode |= VADMIN; } if (drop_suid) { if (vap->va_mode != (mode_t)VNOVAL) vap->va_mode &= ~(S_ISUID | S_ISGID); else { err = fuse_internal_getattr(vp, &old_va, cred, td); if (err) return (err); vap->va_mode = old_va.va_mode & ~(S_ISUID | S_ISGID); } } if (vap->va_mode != (mode_t)VNOVAL) { /* Only root may set the sticky bit on non-directories */ if (checkperm && vp->v_type != VDIR && (vap->va_mode & S_ISTXT) && priv_check_cred(cred, PRIV_VFS_STICKYFILE)) return EFTYPE; if (checkperm && (vap->va_mode & S_ISGID)) { err = fuse_internal_getattr(vp, &old_va, cred, td); if (err) return (err); if (!groupmember(old_va.va_gid, cred)) { err = priv_check_cred(cred, PRIV_VFS_SETGID); if (err) return (err); } } accmode |= VADMIN; } if (vfs_isrdonly(mp)) return EROFS; if (checkperm) { err = fuse_internal_access(vp, accmode, td, cred); } else { err = 0; } if (err) return err; else return fuse_internal_setattr(vp, vap, td, cred); } /* struct vnop_strategy_args { struct vnode *a_vp; struct buf *a_bp; }; */ static int fuse_vnop_strategy(struct vop_strategy_args *ap) { struct vnode *vp = ap->a_vp; struct buf *bp = ap->a_bp; if (!vp || fuse_isdeadfs(vp)) { bp->b_ioflags |= BIO_ERROR; bp->b_error = ENXIO; bufdone(bp); return 0; } /* * VOP_STRATEGY always returns zero and signals error via bp->b_ioflags. * fuse_io_strategy sets bp's error fields */ (void)fuse_io_strategy(vp, bp); return 0; } /* 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; const char *target = ap->a_target; struct fuse_dispatcher fdi; int err; size_t len; 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); return err; } /* struct vnop_write_args { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; }; */ static int fuse_vnop_write(struct vop_write_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; pid_t pid = curthread->td_proc->p_pid; struct fuse_filehandle *fufh; int err; bool closefufh = false, directio; MPASS(vp->v_type == VREG || vp->v_type == VDIR); if (fuse_isdeadfs(vp)) { return ENXIO; } if (VTOFUD(vp)->flag & FN_DIRECTIO) { ioflag |= IO_DIRECT; } err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { /* * nfsd will do I/O without first doing VOP_OPEN. We * must implicitly open the file here */ err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred); closefufh = true; } if (err) { SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred); 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)); fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE); if (directio) { off_t start, end, filesize; bool pages = (ioflag & IO_VMIO) != 0; SDT_PROBE2(fusefs, , vnops, trace, 1, "direct write of vnode"); err = fuse_vnode_size(vp, &filesize, cred, curthread); if (err) goto out; start = uio->uio_offset; end = start + uio->uio_resid; if (!pages) { err = fuse_inval_buf_range(vp, filesize, start, end); if (err) goto out; } err = fuse_write_directbackend(vp, uio, cred, fufh, filesize, ioflag, pages); } else { SDT_PROBE2(fusefs, , vnops, trace, 1, "buffered write of vnode"); if (!fsess_opt_writeback(vnode_mount(vp))) ioflag |= IO_SYNC; err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag, pid); } fuse_internal_clear_suid_on_write(vp, cred, uio->uio_td); out: if (closefufh) fuse_filehandle_close(vp, fufh, curthread, cred); return (err); } static daddr_t fuse_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) { const int biosize = fuse_iosize(vp); return (off / biosize); } static int fuse_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *blksz) { off_t filesize; int err; const int biosize = fuse_iosize(vp); err = fuse_vnode_size(vp, &filesize, NULL, NULL); if (err) { /* This will turn into a SIGBUS */ return (EIO); } else if ((off_t)lbn * biosize >= filesize) { *blksz = 0; } else if ((off_t)(lbn + 1) * biosize > filesize) { *blksz = filesize - (off_t)lbn *biosize; } else { *blksz = biosize; } return (0); } /* struct vnop_getpages_args { struct vnode *a_vp; vm_page_t *a_m; int a_count; int a_reqpage; }; */ static int fuse_vnop_getpages(struct vop_getpages_args *ap) { struct vnode *vp = ap->a_vp; if (!fsess_opt_mmap(vnode_mount(vp))) { SDT_PROBE2(fusefs, , vnops, trace, 1, "called on non-cacheable vnode??\n"); return (VM_PAGER_ERROR); } return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind, ap->a_rahead, fuse_gbp_getblkno, fuse_gbp_getblksz)); } static const char extattr_namespace_separator = '.'; /* struct vop_getextattr_args { struct vop_generic_args a_gen; struct vnode *a_vp; int a_attrnamespace; const char *a_name; struct uio *a_uio; size_t *a_size; struct ucred *a_cred; struct thread *a_td; }; */ static int fuse_vnop_getextattr(struct vop_getextattr_args *ap) { struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct fuse_dispatcher fdi; struct fuse_getxattr_in *get_xattr_in; struct fuse_getxattr_out *get_xattr_out; struct mount *mp = vnode_mount(vp); struct thread *td = ap->a_td; struct ucred *cred = ap->a_cred; char *prefix; char *attr_str; size_t len; int err; if (fuse_isdeadfs(vp)) return (ENXIO); if (fsess_not_impl(mp, FUSE_GETXATTR)) return EOPNOTSUPP; err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD); if (err) return err; /* Default to looking for user attributes. */ if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; else prefix = EXTATTR_NAMESPACE_USER_STRING; len = strlen(prefix) + sizeof(extattr_namespace_separator) + strlen(ap->a_name) + 1; fdisp_init(&fdi, len + sizeof(*get_xattr_in)); fdisp_make_vp(&fdi, FUSE_GETXATTR, vp, td, cred); get_xattr_in = fdi.indata; /* * Check to see whether we're querying the available size or * issuing the actual request. If we pass in 0, we get back struct * fuse_getxattr_out. If we pass in a non-zero size, we get back * that much data, without the struct fuse_getxattr_out header. */ if (uio == NULL) get_xattr_in->size = 0; else get_xattr_in->size = uio->uio_resid; attr_str = (char *)fdi.indata + sizeof(*get_xattr_in); snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator, ap->a_name); err = fdisp_wait_answ(&fdi); if (err != 0) { if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_GETXATTR); err = EOPNOTSUPP; } goto out; } get_xattr_out = fdi.answ; if (ap->a_size != NULL) *ap->a_size = get_xattr_out->size; if (uio != NULL) err = uiomove(fdi.answ, fdi.iosize, uio); out: fdisp_destroy(&fdi); return (err); } /* struct vop_setextattr_args { struct vop_generic_args a_gen; struct vnode *a_vp; int a_attrnamespace; const char *a_name; struct uio *a_uio; struct ucred *a_cred; struct thread *a_td; }; */ static int fuse_vnop_setextattr(struct vop_setextattr_args *ap) { struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct fuse_dispatcher fdi; struct fuse_setxattr_in *set_xattr_in; struct mount *mp = vnode_mount(vp); struct thread *td = ap->a_td; struct ucred *cred = ap->a_cred; char *prefix; size_t len; char *attr_str; int err; if (fuse_isdeadfs(vp)) return (ENXIO); if (fsess_not_impl(mp, FUSE_SETXATTR)) return EOPNOTSUPP; if (vfs_isrdonly(mp)) return EROFS; /* Deleting xattrs must use VOP_DELETEEXTATTR instead */ if (ap->a_uio == NULL) { /* * If we got here as fallback from VOP_DELETEEXTATTR, then * return EOPNOTSUPP. */ if (fsess_not_impl(mp, FUSE_REMOVEXATTR)) return (EOPNOTSUPP); else return (EINVAL); } err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VWRITE); if (err) return err; /* Default to looking for user attributes. */ if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; else prefix = EXTATTR_NAMESPACE_USER_STRING; len = strlen(prefix) + sizeof(extattr_namespace_separator) + strlen(ap->a_name) + 1; fdisp_init(&fdi, len + sizeof(*set_xattr_in) + uio->uio_resid); fdisp_make_vp(&fdi, FUSE_SETXATTR, vp, td, cred); set_xattr_in = fdi.indata; set_xattr_in->size = uio->uio_resid; attr_str = (char *)fdi.indata + sizeof(*set_xattr_in); snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator, ap->a_name); err = uiomove((char *)fdi.indata + sizeof(*set_xattr_in) + len, uio->uio_resid, uio); if (err != 0) { goto out; } err = fdisp_wait_answ(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_SETXATTR); err = EOPNOTSUPP; } if (err == ERESTART) { /* Can't restart after calling uiomove */ err = EINTR; } out: fdisp_destroy(&fdi); return (err); } /* * The Linux / FUSE extended attribute list is simply a collection of * NUL-terminated strings. The FreeBSD extended attribute list is a single * byte length followed by a non-NUL terminated string. So, this allows * conversion of the Linux / FUSE format to the FreeBSD format in place. * Linux attribute names are reported with the namespace as a prefix (e.g. * "user.attribute_name"), but in FreeBSD they are reported without the * namespace prefix (e.g. "attribute_name"). So, we're going from: * * user.attr_name1\0user.attr_name2\0 * * to: * * attr_name1attr_name2 * * Where "" is a single byte number of characters in the attribute name. * * Args: * prefix - exattr namespace prefix string * list, list_len - input list with namespace prefixes * bsd_list, bsd_list_len - output list compatible with bsd vfs */ static int fuse_xattrlist_convert(char *prefix, const char *list, int list_len, char *bsd_list, int *bsd_list_len) { int len, pos, dist_to_next, prefix_len; pos = 0; *bsd_list_len = 0; prefix_len = strlen(prefix); while (pos < list_len && list[pos] != '\0') { dist_to_next = strlen(&list[pos]) + 1; if (bcmp(&list[pos], prefix, prefix_len) == 0 && list[pos + prefix_len] == extattr_namespace_separator) { len = dist_to_next - (prefix_len + sizeof(extattr_namespace_separator)) - 1; if (len >= EXTATTR_MAXNAMELEN) return (ENAMETOOLONG); bsd_list[*bsd_list_len] = len; memcpy(&bsd_list[*bsd_list_len + 1], &list[pos + prefix_len + sizeof(extattr_namespace_separator)], len); *bsd_list_len += len + 1; } pos += dist_to_next; } return (0); } /* * List extended attributes * * The FUSE_LISTXATTR operation is based on Linux's listxattr(2) syscall, which * has a number of differences compared to its FreeBSD equivalent, * extattr_list_file: * * - FUSE_LISTXATTR returns all extended attributes across all namespaces, * whereas listxattr(2) only returns attributes for a single namespace * - FUSE_LISTXATTR prepends each attribute name with "namespace." * - If the provided buffer is not large enough to hold the result, * FUSE_LISTXATTR should return ERANGE, whereas listxattr is expected to * return as many results as will fit. */ /* struct vop_listextattr_args { struct vop_generic_args a_gen; struct vnode *a_vp; int a_attrnamespace; struct uio *a_uio; size_t *a_size; struct ucred *a_cred; struct thread *a_td; }; */ static int fuse_vnop_listextattr(struct vop_listextattr_args *ap) { struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct fuse_dispatcher fdi; struct fuse_listxattr_in *list_xattr_in; struct fuse_listxattr_out *list_xattr_out; struct mount *mp = vnode_mount(vp); struct thread *td = ap->a_td; struct ucred *cred = ap->a_cred; char *prefix; char *bsd_list = NULL; char *linux_list; int bsd_list_len; int linux_list_len; int err; if (fuse_isdeadfs(vp)) return (ENXIO); if (fsess_not_impl(mp, FUSE_LISTXATTR)) return EOPNOTSUPP; err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD); if (err) return err; /* * Add space for a NUL and the period separator if enabled. * Default to looking for user attributes. */ if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; else prefix = EXTATTR_NAMESPACE_USER_STRING; fdisp_init(&fdi, sizeof(*list_xattr_in)); fdisp_make_vp(&fdi, FUSE_LISTXATTR, vp, td, cred); /* * Retrieve Linux / FUSE compatible list size. */ list_xattr_in = fdi.indata; list_xattr_in->size = 0; err = fdisp_wait_answ(&fdi); if (err != 0) { if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_LISTXATTR); err = EOPNOTSUPP; } goto out; } list_xattr_out = fdi.answ; linux_list_len = list_xattr_out->size; if (linux_list_len == 0) { if (ap->a_size != NULL) *ap->a_size = linux_list_len; goto out; } /* * Retrieve Linux / FUSE compatible list values. */ fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred); list_xattr_in = fdi.indata; list_xattr_in->size = linux_list_len; err = fdisp_wait_answ(&fdi); if (err == ERANGE) { /* * Race detected. The attribute list must've grown since the * first FUSE_LISTXATTR call. Start over. Go all the way back * to userland so we can process signals, if necessary, before * restarting. */ err = ERESTART; goto out; } else if (err != 0) goto out; linux_list = fdi.answ; /* FUSE doesn't allow the server to return more data than requested */ if (fdi.iosize > linux_list_len) { struct fuse_data *data = fuse_get_mpdata(mp); fuse_warn(data, FSESS_WARN_LSEXTATTR_LONG, "server returned " "more extended attribute data than requested; " "should've returned ERANGE instead."); } else { /* But returning less data is fine */ linux_list_len = fdi.iosize; } /* * Retrieve the BSD compatible list values. * The Linux / FUSE attribute list format isn't the same * as FreeBSD's format. So we need to transform it into * FreeBSD's format before giving it to the user. */ bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK); err = fuse_xattrlist_convert(prefix, linux_list, linux_list_len, bsd_list, &bsd_list_len); if (err != 0) goto out; if (ap->a_size != NULL) *ap->a_size = bsd_list_len; if (uio != NULL) err = uiomove(bsd_list, bsd_list_len, uio); out: free(bsd_list, M_TEMP); fdisp_destroy(&fdi); return (err); } /* struct vop_deallocate_args { struct vop_generic_args a_gen; struct vnode *a_vp; off_t *a_offset; off_t *a_len; int a_flags; int a_ioflag; struct ucred *a_cred; }; */ static int fuse_vnop_deallocate(struct vop_deallocate_args *ap) { struct vnode *vp = ap->a_vp; struct mount *mp = vnode_mount(vp); struct fuse_filehandle *fufh; struct fuse_dispatcher fdi; struct fuse_fallocate_in *ffi; struct ucred *cred = ap->a_cred; pid_t pid = curthread->td_proc->p_pid; off_t *len = ap->a_len; off_t *offset = ap->a_offset; int ioflag = ap->a_ioflag; off_t filesize; int err; bool closefufh = false; if (fuse_isdeadfs(vp)) return (ENXIO); if (vfs_isrdonly(mp)) return (EROFS); if (fsess_not_impl(mp, FUSE_FALLOCATE)) goto fallback; err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { /* * nfsd will do I/O without first doing VOP_OPEN. We * must implicitly open the file here */ err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred); closefufh = true; } if (err) return (err); fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE); err = fuse_vnode_size(vp, &filesize, cred, curthread); if (err) goto out; fuse_inval_buf_range(vp, filesize, *offset, *offset + *len); fdisp_init(&fdi, sizeof(*ffi)); fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred); ffi = fdi.indata; ffi->fh = fufh->fh_id; ffi->offset = *offset; ffi->length = *len; /* * FreeBSD's fspacectl is equivalent to Linux's fallocate with * mode == FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE */ ffi->mode = FUSE_FALLOC_FL_PUNCH_HOLE | FUSE_FALLOC_FL_KEEP_SIZE; err = fdisp_wait_answ(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_FALLOCATE); goto fallback; } else if (err == EOPNOTSUPP) { /* * The file system server does not support FUSE_FALLOCATE with * the supplied mode for this particular file. */ goto fallback; } else if (!err) { /* * Clip the returned offset to EoF. Do it here rather than * before FUSE_FALLOCATE just in case the kernel's cached file * size is out of date. Unfortunately, FUSE does not return * any information about filesize from that operation. */ *offset = MIN(*offset + *len, filesize); *len = 0; fuse_vnode_undirty_cached_timestamps(vp, false); fuse_internal_clear_suid_on_write(vp, cred, curthread); if (ioflag & IO_SYNC) err = fuse_internal_fsync(vp, curthread, MNT_WAIT, false); } out: if (closefufh) fuse_filehandle_close(vp, fufh, curthread, cred); return (err); fallback: if (closefufh) fuse_filehandle_close(vp, fufh, curthread, cred); return (vop_stddeallocate(ap)); } /* struct vop_deleteextattr_args { struct vop_generic_args a_gen; struct vnode *a_vp; int a_attrnamespace; const char *a_name; struct ucred *a_cred; struct thread *a_td; }; */ static int fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap) { struct vnode *vp = ap->a_vp; struct fuse_dispatcher fdi; struct mount *mp = vnode_mount(vp); struct thread *td = ap->a_td; struct ucred *cred = ap->a_cred; char *prefix; size_t len; char *attr_str; int err; if (fuse_isdeadfs(vp)) return (ENXIO); if (fsess_not_impl(mp, FUSE_REMOVEXATTR)) return EOPNOTSUPP; if (vfs_isrdonly(mp)) return EROFS; err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VWRITE); if (err) return err; /* Default to looking for user attributes. */ if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; else prefix = EXTATTR_NAMESPACE_USER_STRING; len = strlen(prefix) + sizeof(extattr_namespace_separator) + strlen(ap->a_name) + 1; fdisp_init(&fdi, len); fdisp_make_vp(&fdi, FUSE_REMOVEXATTR, vp, td, cred); attr_str = fdi.indata; snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator, ap->a_name); err = fdisp_wait_answ(&fdi); if (err == ENOSYS) { fsess_set_notimpl(mp, FUSE_REMOVEXATTR); err = EOPNOTSUPP; } fdisp_destroy(&fdi); return (err); } /* struct vnop_print_args { struct vnode *a_vp; }; */ static int fuse_vnop_print(struct vop_print_args *ap) { struct fuse_vnode_data *fvdat = VTOFUD(ap->a_vp); printf("nodeid: %ju, parent nodeid: %ju, nlookup: %ju, flag: %#x\n", (uintmax_t)VTOILLU(ap->a_vp), (uintmax_t)fvdat->parent_nid, (uintmax_t)fvdat->nlookup, fvdat->flag); return 0; } /* * Get an NFS filehandle for a FUSE file. * * This will only work for FUSE file systems that guarantee the uniqueness of * nodeid:generation, which most don't. */ /* vop_vptofh { IN struct vnode *a_vp; IN struct fid *a_fhp; }; */ static int fuse_vnop_vptofh(struct vop_vptofh_args *ap) { struct vnode *vp = ap->a_vp; struct fuse_vnode_data *fvdat = VTOFUD(vp); struct fuse_fid *fhp = (struct fuse_fid *)(ap->a_fhp); _Static_assert(sizeof(struct fuse_fid) <= sizeof(struct fid), "FUSE fid type is too big"); struct mount *mp = vnode_mount(vp); struct fuse_data *data = fuse_get_mpdata(mp); struct vattr va; int err; if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) return EOPNOTSUPP; err = fuse_internal_getattr(vp, &va, curthread->td_ucred, curthread); if (err) return err; /*ip = VTOI(ap->a_vp);*/ /*ufhp = (struct ufid *)ap->a_fhp;*/ fhp->len = sizeof(struct fuse_fid); fhp->nid = fvdat->nid; if (fvdat->generation <= UINT32_MAX) fhp->gen = fvdat->generation; else return EOVERFLOW; return (0); }