/*- * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Julio M. Merino Vidal, developed as part of Google's Summer of Code * 2005 program. * * 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 THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. * * $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ /* * tmpfs vnode interface. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_DECLARE(M_TMPFS); static __inline void tmpfs_knote(struct vnode *vp, int flags) { if (flags) KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); } /* --------------------------------------------------------------------- */ static int tmpfs_nresolve(struct vop_nresolve_args *v) { struct vnode *dvp = v->a_dvp; struct vnode *vp = NULL; struct namecache *ncp = v->a_nch->ncp; struct tmpfs_node *tnode; int error; struct tmpfs_dirent *de; struct tmpfs_node *dnode; dnode = VP_TO_TMPFS_DIR(dvp); de = tmpfs_dir_lookup(dnode, NULL, ncp); if (de == NULL) { error = ENOENT; } else { /* * Allocate a vnode for the node we found. */ tnode = de->td_node; error = tmpfs_alloc_vp(dvp->v_mount, tnode, LK_EXCLUSIVE | LK_RETRY, &vp); if (error) goto out; KKASSERT(vp); } out: /* * Store the result of this lookup in the cache. Avoid this if the * request was for creation, as it does not improve timings on * emprical tests. */ if (vp) { vn_unlock(vp); cache_setvp(v->a_nch, vp); vrele(vp); } else if (error == ENOENT) { cache_setvp(v->a_nch, NULL); } return error; } static int tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v) { struct vnode *dvp = v->a_dvp; struct vnode **vpp = v->a_vpp; struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); struct ucred *cred = v->a_cred; int error; *vpp = NULL; /* Check accessibility of requested node as a first step. */ error = VOP_ACCESS(dvp, VEXEC, cred); if (error != 0) return error; if (dnode->tn_dir.tn_parent != NULL) { /* Allocate a new vnode on the matching entry. */ error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, LK_EXCLUSIVE | LK_RETRY, vpp); if (*vpp) vn_unlock(*vpp); } return (*vpp == NULL) ? ENOENT : 0; } /* --------------------------------------------------------------------- */ static int tmpfs_ncreate(struct vop_ncreate_args *v) { struct vnode *dvp = v->a_dvp; struct vnode **vpp = v->a_vpp; struct namecache *ncp = v->a_nch->ncp; struct vattr *vap = v->a_vap; struct ucred *cred = v->a_cred; int error; KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); if (error == 0) { cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, *vpp); tmpfs_knote(dvp, NOTE_WRITE); } return error; } /* --------------------------------------------------------------------- */ static int tmpfs_nmknod(struct vop_nmknod_args *v) { struct vnode *dvp = v->a_dvp; struct vnode **vpp = v->a_vpp; struct namecache *ncp = v->a_nch->ncp; struct vattr *vap = v->a_vap; struct ucred *cred = v->a_cred; int error; if (vap->va_type != VBLK && vap->va_type != VCHR && vap->va_type != VFIFO) return EINVAL; error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); if (error == 0) { cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, *vpp); tmpfs_knote(dvp, NOTE_WRITE); } return error; } /* --------------------------------------------------------------------- */ static int tmpfs_open(struct vop_open_args *v) { struct vnode *vp = v->a_vp; int mode = v->a_mode; int error; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); /* The file is still active but all its names have been removed * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as * it is about to die. */ if (node->tn_links < 1) return (ENOENT); /* If the file is marked append-only, deny write requests. */ if ((node->tn_flags & APPEND) && (mode & (FWRITE | O_APPEND)) == FWRITE) { error = EPERM; } else { return (vop_stdopen(v)); } return error; } /* --------------------------------------------------------------------- */ static int tmpfs_close(struct vop_close_args *v) { struct vnode *vp = v->a_vp; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); if (node->tn_links > 0) { /* Update node times. No need to do it if the node has * been deleted, because it will vanish after we return. */ tmpfs_update(vp); } return vop_stdclose(v); } /* --------------------------------------------------------------------- */ int tmpfs_access(struct vop_access_args *v) { struct vnode *vp = v->a_vp; int error; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); switch (vp->v_type) { case VDIR: /* FALLTHROUGH */ case VLNK: /* FALLTHROUGH */ case VREG: if (VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { error = EROFS; goto out; } break; case VBLK: /* FALLTHROUGH */ case VCHR: /* FALLTHROUGH */ case VSOCK: /* FALLTHROUGH */ case VFIFO: break; default: error = EINVAL; goto out; } if (VWRITE && node->tn_flags & IMMUTABLE) { error = EPERM; goto out; } error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0); out: return error; } /* --------------------------------------------------------------------- */ int tmpfs_getattr(struct vop_getattr_args *v) { struct vnode *vp = v->a_vp; struct vattr *vap = v->a_vap; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); tmpfs_update(vp); vap->va_type = vp->v_type; vap->va_mode = node->tn_mode; vap->va_nlink = node->tn_links; vap->va_uid = node->tn_uid; vap->va_gid = node->tn_gid; vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; vap->va_fileid = node->tn_id; vap->va_size = node->tn_size; vap->va_blocksize = PAGE_SIZE; vap->va_atime.tv_sec = node->tn_atime; vap->va_atime.tv_nsec = node->tn_atimensec; vap->va_mtime.tv_sec = node->tn_mtime; vap->va_mtime.tv_nsec = node->tn_mtimensec; vap->va_ctime.tv_sec = node->tn_ctime; vap->va_ctime.tv_nsec = node->tn_ctimensec; vap->va_gen = node->tn_gen; vap->va_flags = node->tn_flags; if (vp->v_type == VBLK || vp->v_type == VCHR) { vap->va_rmajor = umajor(node->tn_rdev); vap->va_rminor = uminor(node->tn_rdev); } vap->va_bytes = round_page(node->tn_size); vap->va_filerev = 0; return 0; } /* --------------------------------------------------------------------- */ int tmpfs_setattr(struct vop_setattr_args *v) { struct vnode *vp = v->a_vp; struct vattr *vap = v->a_vap; struct ucred *cred = v->a_cred; struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); int error = 0; int kflags = 0; if (error == 0 && (vap->va_flags != VNOVAL)) { error = tmpfs_chflags(vp, vap->va_flags, cred); kflags |= NOTE_ATTRIB; } if (error == 0 && (vap->va_size != VNOVAL)) { if (vap->va_size > node->tn_size) kflags |= NOTE_WRITE | NOTE_EXTEND; else kflags |= NOTE_WRITE; error = tmpfs_chsize(vp, vap->va_size, cred); } if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL)) { error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); kflags |= NOTE_ATTRIB; } if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { error = tmpfs_chmod(vp, vap->va_mode, cred); kflags |= NOTE_ATTRIB; } if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && vap->va_atime.tv_nsec != VNOVAL) || (vap->va_mtime.tv_sec != VNOVAL && vap->va_mtime.tv_nsec != VNOVAL) )) { error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, vap->va_vaflags, cred); kflags |= NOTE_ATTRIB; } /* Update the node times. We give preference to the error codes * generated by this function rather than the ones that may arise * from tmpfs_update. */ tmpfs_update(vp); tmpfs_knote(vp, kflags); return error; } /* --------------------------------------------------------------------- */ /* * fsync is usually a NOP, but we must take action when unmounting or * when recycling. */ static int tmpfs_fsync(struct vop_fsync_args *v) { struct tmpfs_mount *tmp; struct tmpfs_node *node; struct vnode *vp = v->a_vp; tmp = VFS_TO_TMPFS(vp->v_mount); node = VP_TO_TMPFS_NODE(vp); tmpfs_update(vp); if (vp->v_type == VREG) { if (vp->v_flag & VRECLAIMED) { if (node->tn_links == 0) tmpfs_truncate(vp, 0); else vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); } } return 0; } /* --------------------------------------------------------------------- */ static int tmpfs_read (struct vop_read_args *ap) { struct buf *bp; struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct tmpfs_node *node; off_t base_offset; size_t offset; size_t len; int got_mplock; int error; error = 0; if (uio->uio_resid == 0) { return error; } node = VP_TO_TMPFS_NODE(vp); if (uio->uio_offset < 0) return (EINVAL); if (vp->v_type != VREG) return (EINVAL); #ifdef SMP if(curthread->td_mpcount) got_mplock = -1; else got_mplock = 0; #else got_mplock = -1; #endif while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { /* * Use buffer cache I/O (via tmpfs_strategy) */ offset = (size_t)uio->uio_offset & BMASK; base_offset = (off_t)uio->uio_offset - offset; bp = getcacheblk(vp, base_offset); if (bp == NULL) { if (got_mplock == 0) { got_mplock = 1; get_mplock(); } error = bread(vp, base_offset, BSIZE, &bp); if (error) { brelse(bp); kprintf("tmpfs_read bread error %d\n", error); break; } } if (got_mplock == 0) { got_mplock = 1; get_mplock(); } /* * Figure out how many bytes we can actually copy this loop. */ len = BSIZE - offset; if (len > uio->uio_resid) len = uio->uio_resid; if (len > node->tn_size - uio->uio_offset) len = (size_t)(node->tn_size - uio->uio_offset); error = uiomove((char *)bp->b_data + offset, len, uio); bqrelse(bp); if (error) { kprintf("tmpfs_read uiomove error %d\n", error); break; } } if (got_mplock > 0) rel_mplock(); TMPFS_NODE_LOCK(node); node->tn_status |= TMPFS_NODE_ACCESSED; TMPFS_NODE_UNLOCK(node); return(error); } static int tmpfs_write (struct vop_write_args *ap) { struct buf *bp; struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct thread *td = uio->uio_td; struct tmpfs_node *node; boolean_t extended; off_t oldsize; int error; off_t base_offset; size_t offset; size_t len; struct rlimit limit; int got_mplock; int trivial = 0; int kflags = 0; error = 0; if (uio->uio_resid == 0) { return error; } node = VP_TO_TMPFS_NODE(vp); if (vp->v_type != VREG) return (EINVAL); oldsize = node->tn_size; if (ap->a_ioflag & IO_APPEND) uio->uio_offset = node->tn_size; /* * Check for illegal write offsets. */ if (uio->uio_offset + uio->uio_resid > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) return (EFBIG); if (vp->v_type == VREG && td != NULL) { error = kern_getrlimit(RLIMIT_FSIZE, &limit); if (error != 0) return error; if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { ksignal(td->td_proc, SIGXFSZ); return (EFBIG); } } /* * Extend the file's size if necessary */ extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); #ifdef SMP if (curthread->td_mpcount) { got_mplock = -1; } else { got_mplock = 1; get_mplock(); } #else got_mplock = -1; #endif while (uio->uio_resid > 0) { /* * Use buffer cache I/O (via tmpfs_strategy) */ offset = (size_t)uio->uio_offset & BMASK; base_offset = (off_t)uio->uio_offset - offset; len = BSIZE - offset; if (len > uio->uio_resid) len = uio->uio_resid; if ((uio->uio_offset + len) > node->tn_size) { trivial = (uio->uio_offset <= node->tn_size); error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial); if (error) break; } /* * Read to fill in any gaps. Theoretically we could * optimize this if the write covers the entire buffer * and is not a UIO_NOCOPY write, however this can lead * to a security violation exposing random kernel memory * (whatever junk was in the backing VM pages before). * * So just use bread() to do the right thing. */ error = bread(vp, base_offset, BSIZE, &bp); error = uiomove((char *)bp->b_data + offset, len, uio); if (error) { kprintf("tmpfs_write uiomove error %d\n", error); brelse(bp); break; } if (uio->uio_offset > node->tn_size) { node->tn_size = uio->uio_offset; kflags |= NOTE_EXTEND; } kflags |= NOTE_WRITE; /* * The data has been loaded into the buffer, write it out. * * We want tmpfs to be able to use all available ram, not * just the buffer cache, so if not explicitly paging we * use buwrite() to leave the buffer clean but mark all the * VM pages valid+dirty. * * When the kernel is paging, either via normal pageout * operation or when cleaning the object during a recycle, * the underlying VM pages are going to get thrown away * so we MUST write them to swap. * * XXX unfortunately this catches msync() system calls too * for the moment. */ if (vm_swap_size == 0) { /* * if swap isn't configured yet, force a buwrite() to * avoid problems further down the line, due to flushing * to swap. */ buwrite(bp); } else { if (ap->a_ioflag & IO_SYNC) { bwrite(bp); } else if ((ap->a_ioflag & IO_ASYNC) || (uio->uio_segflg == UIO_NOCOPY)) { bawrite(bp); } else { buwrite(bp); } } if (bp->b_error) { kprintf("tmpfs_write bwrite error %d\n", bp->b_error); break; } } if (got_mplock > 0) rel_mplock(); if (error) { if (extended) { (void)tmpfs_reg_resize(vp, oldsize, trivial); kflags &= ~NOTE_EXTEND; } goto done; } TMPFS_NODE_LOCK(node); node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | (extended? TMPFS_NODE_CHANGED : 0); if (node->tn_mode & (S_ISUID | S_ISGID)) { if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) node->tn_mode &= ~(S_ISUID | S_ISGID); } TMPFS_NODE_UNLOCK(node); done: tmpfs_knote(vp, kflags); return(error); } static int tmpfs_advlock (struct vop_advlock_args *ap) { struct tmpfs_node *node; struct vnode *vp = ap->a_vp; node = VP_TO_TMPFS_NODE(vp); return (lf_advlock(ap, &node->tn_advlock, node->tn_size)); } static int tmpfs_strategy(struct vop_strategy_args *ap) { struct bio *bio = ap->a_bio; struct buf *bp = bio->bio_buf; struct vnode *vp = ap->a_vp; struct tmpfs_node *node; vm_object_t uobj; if (vp->v_type != VREG) { bp->b_resid = bp->b_bcount; bp->b_flags |= B_ERROR | B_INVAL; bp->b_error = EINVAL; biodone(bio); return(0); } node = VP_TO_TMPFS_NODE(vp); uobj = node->tn_reg.tn_aobj; /* * Call swap_pager_strategy to read or write between the VM * object and the buffer cache. */ swap_pager_strategy(uobj, bio); return 0; } static int tmpfs_bmap(struct vop_bmap_args *ap) { if (ap->a_doffsetp != NULL) *ap->a_doffsetp = ap->a_loffset; if (ap->a_runp != NULL) *ap->a_runp = 0; if (ap->a_runb != NULL) *ap->a_runb = 0; return 0; } /* --------------------------------------------------------------------- */ static int tmpfs_nremove(struct vop_nremove_args *v) { struct vnode *dvp = v->a_dvp; struct namecache *ncp = v->a_nch->ncp; struct vnode *vp; int error; struct tmpfs_dirent *de; struct tmpfs_mount *tmp; struct tmpfs_node *dnode; struct tmpfs_node *node; /* * We have to acquire the vp from v->a_nch because * we will likely unresolve the namecache entry, and * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim * sequence to recover space from the file. */ error = cache_vref(v->a_nch, v->a_cred, &vp); KKASSERT(error == 0); if (vp->v_type == VDIR) { error = EISDIR; goto out; } dnode = VP_TO_TMPFS_DIR(dvp); node = VP_TO_TMPFS_NODE(vp); tmp = VFS_TO_TMPFS(vp->v_mount); de = tmpfs_dir_lookup(dnode, node, ncp); if (de == NULL) { error = ENOENT; goto out; } /* Files marked as immutable or append-only cannot be deleted. */ if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || (dnode->tn_flags & APPEND)) { error = EPERM; goto out; } /* Remove the entry from the directory; as it is a file, we do not * have to change the number of hard links of the directory. */ tmpfs_dir_detach(dnode, de); /* Free the directory entry we just deleted. Note that the node * referred by it will not be removed until the vnode is really * reclaimed. */ tmpfs_free_dirent(tmp, de); if (node->tn_links > 0) { TMPFS_NODE_LOCK(node); node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ TMPFS_NODE_MODIFIED; TMPFS_NODE_UNLOCK(node); } cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, NULL); tmpfs_knote(vp, NOTE_DELETE); /*cache_inval_vp(vp, CINV_DESTROY);*/ tmpfs_knote(dvp, NOTE_WRITE); error = 0; out: vrele(vp); return error; } /* --------------------------------------------------------------------- */ static int tmpfs_nlink(struct vop_nlink_args *v) { struct vnode *dvp = v->a_dvp; struct vnode *vp = v->a_vp; struct namecache *ncp = v->a_nch->ncp; struct tmpfs_dirent *de; struct tmpfs_node *node; struct tmpfs_node *dnode; int error; KKASSERT(dvp != vp); /* XXX When can this be false? */ node = VP_TO_TMPFS_NODE(vp); dnode = VP_TO_TMPFS_NODE(dvp); /* XXX: Why aren't the following two tests done by the caller? */ /* Hard links of directories are forbidden. */ if (vp->v_type == VDIR) { error = EPERM; goto out; } /* Cannot create cross-device links. */ if (dvp->v_mount != vp->v_mount) { error = EXDEV; goto out; } /* Ensure that we do not overflow the maximum number of links imposed * by the system. */ KKASSERT(node->tn_links <= LINK_MAX); if (node->tn_links == LINK_MAX) { error = EMLINK; goto out; } /* We cannot create links of files marked immutable or append-only. */ if (node->tn_flags & (IMMUTABLE | APPEND)) { error = EPERM; goto out; } /* Allocate a new directory entry to represent the node. */ error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, ncp->nc_name, ncp->nc_nlen, &de); if (error != 0) goto out; /* Insert the new directory entry into the appropriate directory. */ tmpfs_dir_attach(dnode, de); /* vp link count has changed, so update node times. */ TMPFS_NODE_LOCK(node); node->tn_status |= TMPFS_NODE_CHANGED; TMPFS_NODE_UNLOCK(node); tmpfs_update(vp); tmpfs_knote(vp, NOTE_LINK); cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, vp); tmpfs_knote(dvp, NOTE_WRITE); error = 0; out: return error; } /* --------------------------------------------------------------------- */ static int tmpfs_nrename(struct vop_nrename_args *v) { struct vnode *fdvp = v->a_fdvp; struct namecache *fncp = v->a_fnch->ncp; struct vnode *fvp = fncp->nc_vp; struct vnode *tdvp = v->a_tdvp; struct namecache *tncp = v->a_tnch->ncp; struct vnode *tvp = tncp->nc_vp; struct tmpfs_dirent *de; struct tmpfs_mount *tmp; struct tmpfs_node *fdnode; struct tmpfs_node *fnode; struct tmpfs_node *tnode; struct tmpfs_node *tdnode; char *newname; char *oldname; int error; tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); /* Disallow cross-device renames. * XXX Why isn't this done by the caller? */ if (fvp->v_mount != tdvp->v_mount || (tvp != NULL && fvp->v_mount != tvp->v_mount)) { error = EXDEV; goto out; } tmp = VFS_TO_TMPFS(tdvp->v_mount); tdnode = VP_TO_TMPFS_DIR(tdvp); /* If source and target are the same file, there is nothing to do. */ if (fvp == tvp) { error = 0; goto out; } fdnode = VP_TO_TMPFS_DIR(fdvp); fnode = VP_TO_TMPFS_NODE(fvp); de = tmpfs_dir_lookup(fdnode, fnode, fncp); /* Avoid manipulating '.' and '..' entries. */ if (de == NULL) { error = ENOENT; goto out_locked; } KKASSERT(de->td_node == fnode); /* * If replacing an entry in the target directory and that entry * is a directory, it must be empty. * * Kern_rename gurantees the destination to be a directory * if the source is one (it does?). */ if (tvp != NULL) { KKASSERT(tnode != NULL); if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (tdnode->tn_flags & (APPEND | IMMUTABLE))) { error = EPERM; goto out_locked; } if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { if (tnode->tn_size > 0) { error = ENOTEMPTY; goto out_locked; } } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { error = ENOTDIR; goto out_locked; } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { error = EISDIR; goto out_locked; } else { KKASSERT(fnode->tn_type != VDIR && tnode->tn_type != VDIR); } } if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { error = EPERM; goto out_locked; } /* * Ensure that we have enough memory to hold the new name, if it * has to be changed. */ if (fncp->nc_nlen != tncp->nc_nlen || bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, M_WAITOK | M_NULLOK); if (newname == NULL) { error = ENOSPC; goto out_locked; } bcopy(tncp->nc_name, newname, tncp->nc_nlen); newname[tncp->nc_nlen] = '\0'; } else { newname = NULL; } /* * Unlink entry from source directory. Note that the kernel has * already checked for illegal recursion cases (renaming a directory * into a subdirectory of itself). */ if (fdnode != tdnode) tmpfs_dir_detach(fdnode, de); /* * Handle any name change. Swap with newname, we will * deallocate it at the end. */ if (newname != NULL) { #if 0 TMPFS_NODE_LOCK(fnode); fnode->tn_status |= TMPFS_NODE_CHANGED; TMPFS_NODE_UNLOCK(fnode); #endif oldname = de->td_name; de->td_name = newname; de->td_namelen = (uint16_t)tncp->nc_nlen; newname = oldname; } /* * Link entry to target directory. If the entry * represents a directory move the parent linkage * as well. */ if (fdnode != tdnode) { if (de->td_node->tn_type == VDIR) { TMPFS_VALIDATE_DIR(fnode); TMPFS_NODE_LOCK(tdnode); tdnode->tn_links++; tdnode->tn_status |= TMPFS_NODE_MODIFIED; TMPFS_NODE_UNLOCK(tdnode); TMPFS_NODE_LOCK(fnode); fnode->tn_dir.tn_parent = tdnode; fnode->tn_status |= TMPFS_NODE_CHANGED; TMPFS_NODE_UNLOCK(fnode); TMPFS_NODE_LOCK(fdnode); fdnode->tn_links--; fdnode->tn_status |= TMPFS_NODE_MODIFIED; TMPFS_NODE_UNLOCK(fdnode); } tmpfs_dir_attach(tdnode, de); } else { TMPFS_NODE_LOCK(tdnode); tdnode->tn_status |= TMPFS_NODE_MODIFIED; TMPFS_NODE_UNLOCK(tdnode); } /* * If we are overwriting an entry, we have to remove the old one * from the target directory. */ if (tvp != NULL) { /* Remove the old entry from the target directory. */ de = tmpfs_dir_lookup(tdnode, tnode, tncp); tmpfs_dir_detach(tdnode, de); tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); /* * Free the directory entry we just deleted. Note that the * node referred by it will not be removed until the vnode is * really reclaimed. */ tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de); /*cache_inval_vp(tvp, CINV_DESTROY);*/ } /* * Finish up */ if (newname) { kfree(newname, tmp->tm_name_zone); newname = NULL; } cache_rename(v->a_fnch, v->a_tnch); tmpfs_knote(v->a_fdvp, NOTE_WRITE); tmpfs_knote(v->a_tdvp, NOTE_WRITE); if (fnode->tn_vnode) tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); error = 0; out_locked: ; out: /* Release target nodes. */ /* XXX: I don't understand when tdvp can be the same as tvp, but * other code takes care of this... */ if (tdvp == tvp) vrele(tdvp); return error; } /* --------------------------------------------------------------------- */ static int tmpfs_nmkdir(struct vop_nmkdir_args *v) { struct vnode *dvp = v->a_dvp; struct vnode **vpp = v->a_vpp; struct namecache *ncp = v->a_nch->ncp; struct vattr *vap = v->a_vap; struct ucred *cred = v->a_cred; int error; KKASSERT(vap->va_type == VDIR); error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); if (error == 0) { cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, *vpp); tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); } return error; } /* --------------------------------------------------------------------- */ static int tmpfs_nrmdir(struct vop_nrmdir_args *v) { struct vnode *dvp = v->a_dvp; struct namecache *ncp = v->a_nch->ncp; struct vnode *vp; struct tmpfs_dirent *de; struct tmpfs_mount *tmp; struct tmpfs_node *dnode; struct tmpfs_node *node; int error; /* * We have to acquire the vp from v->a_nch because * we will likely unresolve the namecache entry, and * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim * sequence. */ error = cache_vref(v->a_nch, v->a_cred, &vp); KKASSERT(error == 0); /* * Prevalidate so we don't hit an assertion later */ if (vp->v_type != VDIR) { error = ENOTDIR; goto out; } tmp = VFS_TO_TMPFS(dvp->v_mount); dnode = VP_TO_TMPFS_DIR(dvp); node = VP_TO_TMPFS_DIR(vp); /* Directories with more than two entries ('.' and '..') cannot be * removed. */ if (node->tn_size > 0) { error = ENOTEMPTY; goto out; } if ((dnode->tn_flags & APPEND) || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { error = EPERM; goto out; } /* This invariant holds only if we are not trying to remove "..". * We checked for that above so this is safe now. */ KKASSERT(node->tn_dir.tn_parent == dnode); /* Get the directory entry associated with node (vp). This was * filled by tmpfs_lookup while looking up the entry. */ de = tmpfs_dir_lookup(dnode, node, ncp); KKASSERT(TMPFS_DIRENT_MATCHES(de, ncp->nc_name, ncp->nc_nlen)); /* Check flags to see if we are allowed to remove the directory. */ if ((dnode->tn_flags & APPEND) || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { error = EPERM; goto out; } /* Detach the directory entry from the directory (dnode). */ tmpfs_dir_detach(dnode, de); /* No vnode should be allocated for this entry from this point */ TMPFS_NODE_LOCK(node); TMPFS_ASSERT_ELOCKED(node); TMPFS_NODE_LOCK(dnode); TMPFS_ASSERT_ELOCKED(dnode); #if 0 /* handled by tmpfs_free_node */ KKASSERT(node->tn_links > 0); node->tn_links--; node->tn_dir.tn_parent = NULL; #endif node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ TMPFS_NODE_MODIFIED; #if 0 /* handled by tmpfs_free_node */ KKASSERT(dnode->tn_links > 0); dnode->tn_links--; #endif dnode->tn_status |= TMPFS_NODE_ACCESSED | \ TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; TMPFS_NODE_UNLOCK(dnode); TMPFS_NODE_UNLOCK(node); /* Free the directory entry we just deleted. Note that the node * referred by it will not be removed until the vnode is really * reclaimed. */ tmpfs_free_dirent(tmp, de); /* Release the deleted vnode (will destroy the node, notify * interested parties and clean it from the cache). */ TMPFS_NODE_LOCK(dnode); dnode->tn_status |= TMPFS_NODE_CHANGED; TMPFS_NODE_UNLOCK(dnode); tmpfs_update(dvp); cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, NULL); /*cache_inval_vp(vp, CINV_DESTROY);*/ tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); error = 0; out: vrele(vp); return error; } /* --------------------------------------------------------------------- */ static int tmpfs_nsymlink(struct vop_nsymlink_args *v) { struct vnode *dvp = v->a_dvp; struct vnode **vpp = v->a_vpp; struct namecache *ncp = v->a_nch->ncp; struct vattr *vap = v->a_vap; struct ucred *cred = v->a_cred; char *target = v->a_target; int error; vap->va_type = VLNK; error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); if (error == 0) { tmpfs_knote(*vpp, NOTE_WRITE); cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, *vpp); } return error; } /* --------------------------------------------------------------------- */ static int tmpfs_readdir(struct vop_readdir_args *v) { struct vnode *vp = v->a_vp; struct uio *uio = v->a_uio; int *eofflag = v->a_eofflag; off_t **cookies = v->a_cookies; int *ncookies = v->a_ncookies; struct tmpfs_mount *tmp; int error; off_t startoff; off_t cnt = 0; struct tmpfs_node *node; /* This operation only makes sense on directory nodes. */ if (vp->v_type != VDIR) return ENOTDIR; tmp = VFS_TO_TMPFS(vp->v_mount); node = VP_TO_TMPFS_DIR(vp); startoff = uio->uio_offset; if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { error = tmpfs_dir_getdotdent(node, uio); if (error != 0) goto outok; cnt++; } if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { error = tmpfs_dir_getdotdotdent(tmp, node, uio); if (error != 0) goto outok; cnt++; } error = tmpfs_dir_getdents(node, uio, &cnt); outok: KKASSERT(error >= -1); if (error == -1) error = 0; if (eofflag != NULL) *eofflag = (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); /* Update NFS-related variables. */ if (error == 0 && cookies != NULL && ncookies != NULL) { off_t i; off_t off = startoff; struct tmpfs_dirent *de = NULL; *ncookies = cnt; *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); for (i = 0; i < cnt; i++) { KKASSERT(off != TMPFS_DIRCOOKIE_EOF); if (off == TMPFS_DIRCOOKIE_DOT) { off = TMPFS_DIRCOOKIE_DOTDOT; } else { if (off == TMPFS_DIRCOOKIE_DOTDOT) { de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); } else if (de != NULL) { de = TAILQ_NEXT(de, td_entries); } else { de = tmpfs_dir_lookupbycookie(node, off); KKASSERT(de != NULL); de = TAILQ_NEXT(de, td_entries); } if (de == NULL) off = TMPFS_DIRCOOKIE_EOF; else off = tmpfs_dircookie(de); } (*cookies)[i] = off; } KKASSERT(uio->uio_offset == off); } return error; } /* --------------------------------------------------------------------- */ static int tmpfs_readlink(struct vop_readlink_args *v) { struct vnode *vp = v->a_vp; struct uio *uio = v->a_uio; int error; struct tmpfs_node *node; KKASSERT(uio->uio_offset == 0); KKASSERT(vp->v_type == VLNK); node = VP_TO_TMPFS_NODE(vp); error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), uio); TMPFS_NODE_LOCK(node); node->tn_status |= TMPFS_NODE_ACCESSED; TMPFS_NODE_UNLOCK(node); return error; } /* --------------------------------------------------------------------- */ static int tmpfs_inactive(struct vop_inactive_args *v) { struct vnode *vp = v->a_vp; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); /* * Get rid of unreferenced deleted vnodes sooner rather than * later so the data memory can be recovered immediately. * * We must truncate the vnode to prevent the normal reclamation * path from flushing the data for the removed file to disk. */ TMPFS_NODE_LOCK(node); if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && (node->tn_links == 0 || (node->tn_links == 1 && node->tn_type == VDIR && node->tn_dir.tn_parent))) { node->tn_vpstate = TMPFS_VNODE_DOOMED; TMPFS_NODE_UNLOCK(node); if (node->tn_type == VREG) tmpfs_truncate(vp, 0); vrecycle(vp); } else { TMPFS_NODE_UNLOCK(node); } return 0; } /* --------------------------------------------------------------------- */ int tmpfs_reclaim(struct vop_reclaim_args *v) { struct vnode *vp = v->a_vp; struct tmpfs_mount *tmp; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); tmp = VFS_TO_TMPFS(vp->v_mount); tmpfs_free_vp(vp); /* * If the node referenced by this vnode was deleted by the * user, we must free its associated data structures now that * the vnode is being reclaimed. * * Directories have an extra link ref. */ TMPFS_NODE_LOCK(node); if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && (node->tn_links == 0 || (node->tn_links == 1 && node->tn_type == VDIR && node->tn_dir.tn_parent))) { node->tn_vpstate = TMPFS_VNODE_DOOMED; tmpfs_free_node(tmp, node); /* eats the lock */ } else { TMPFS_NODE_UNLOCK(node); } KKASSERT(vp->v_data == NULL); return 0; } /* --------------------------------------------------------------------- */ static int tmpfs_print(struct vop_print_args *v) { struct vnode *vp = v->a_vp; struct tmpfs_node *node; node = VP_TO_TMPFS_NODE(vp); kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", node, node->tn_flags, node->tn_links); kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", node->tn_mode, node->tn_uid, node->tn_gid, (uintmax_t)node->tn_size, node->tn_status); if (vp->v_type == VFIFO) fifo_printinfo(vp); kprintf("\n"); return 0; } /* --------------------------------------------------------------------- */ static int tmpfs_pathconf(struct vop_pathconf_args *v) { int name = v->a_name; register_t *retval = v->a_retval; int error; error = 0; switch (name) { case _PC_LINK_MAX: *retval = LINK_MAX; break; case _PC_NAME_MAX: *retval = NAME_MAX; break; case _PC_PATH_MAX: *retval = PATH_MAX; break; case _PC_PIPE_BUF: *retval = PIPE_BUF; break; case _PC_CHOWN_RESTRICTED: *retval = 1; break; case _PC_NO_TRUNC: *retval = 1; break; case _PC_SYNC_IO: *retval = 1; break; case _PC_FILESIZEBITS: *retval = 0; /* XXX Don't know which value should I return. */ break; default: error = EINVAL; } return error; } /************************************************************************ * KQFILTER OPS * ************************************************************************/ static void filt_tmpfsdetach(struct knote *kn); static int filt_tmpfsread(struct knote *kn, long hint); static int filt_tmpfswrite(struct knote *kn, long hint); static int filt_tmpfsvnode(struct knote *kn, long hint); static struct filterops tmpfsread_filtops = { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; static struct filterops tmpfswrite_filtops = { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; static struct filterops tmpfsvnode_filtops = { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; static int tmpfs_kqfilter (struct vop_kqfilter_args *ap) { struct vnode *vp = ap->a_vp; struct knote *kn = ap->a_kn; switch (kn->kn_filter) { case EVFILT_READ: kn->kn_fop = &tmpfsread_filtops; break; case EVFILT_WRITE: kn->kn_fop = &tmpfswrite_filtops; break; case EVFILT_VNODE: kn->kn_fop = &tmpfsvnode_filtops; break; default: return (EOPNOTSUPP); } kn->kn_hook = (caddr_t)vp; knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); return(0); } static void filt_tmpfsdetach(struct knote *kn) { struct vnode *vp = (void *)kn->kn_hook; knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); } static int filt_tmpfsread(struct knote *kn, long hint) { struct vnode *vp = (void *)kn->kn_hook; struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); off_t off; if (hint == NOTE_REVOKE) { kn->kn_flags |= (EV_EOF | EV_ONESHOT); return(1); } off = node->tn_size - kn->kn_fp->f_offset; kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; if (kn->kn_sfflags & NOTE_OLDAPI) return(1); /* * Handle possible MP race interlock on filter check/write */ if (kn->kn_data == 0) { get_mplock(); kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; rel_mplock(); } return (kn->kn_data != 0); } static int filt_tmpfswrite(struct knote *kn, long hint) { if (hint == NOTE_REVOKE) kn->kn_flags |= (EV_EOF | EV_ONESHOT); kn->kn_data = 0; return (1); } static int filt_tmpfsvnode(struct knote *kn, long hint) { if (kn->kn_sfflags & hint) kn->kn_fflags |= hint; if (hint == NOTE_REVOKE) { kn->kn_flags |= EV_EOF; return (1); } return (kn->kn_fflags != 0); } /* --------------------------------------------------------------------- */ /* * vnode operations vector used for files stored in a tmpfs file system. */ struct vop_ops tmpfs_vnode_vops = { .vop_default = vop_defaultop, .vop_getpages = vop_stdgetpages, .vop_putpages = vop_stdputpages, .vop_ncreate = tmpfs_ncreate, .vop_nresolve = tmpfs_nresolve, .vop_nlookupdotdot = tmpfs_nlookupdotdot, .vop_nmknod = tmpfs_nmknod, .vop_open = tmpfs_open, .vop_close = tmpfs_close, .vop_access = tmpfs_access, .vop_getattr = tmpfs_getattr, .vop_setattr = tmpfs_setattr, .vop_read = tmpfs_read, .vop_write = tmpfs_write, .vop_fsync = tmpfs_fsync, .vop_nremove = tmpfs_nremove, .vop_nlink = tmpfs_nlink, .vop_nrename = tmpfs_nrename, .vop_nmkdir = tmpfs_nmkdir, .vop_nrmdir = tmpfs_nrmdir, .vop_nsymlink = tmpfs_nsymlink, .vop_readdir = tmpfs_readdir, .vop_readlink = tmpfs_readlink, .vop_inactive = tmpfs_inactive, .vop_reclaim = tmpfs_reclaim, .vop_print = tmpfs_print, .vop_pathconf = tmpfs_pathconf, .vop_bmap = tmpfs_bmap, .vop_strategy = tmpfs_strategy, .vop_advlock = tmpfs_advlock, .vop_kqfilter = tmpfs_kqfilter };