tmpfs_vnops.c revision 171069
1171069Sdelphij/* $NetBSD: tmpfs_vnops.c,v 1.35 2007/01/04 15:42:37 elad Exp $ */ 2170808Sdelphij 3170808Sdelphij/* 4170808Sdelphij * Copyright (c) 2005 The NetBSD Foundation, Inc. 5170808Sdelphij * All rights reserved. 6170808Sdelphij * 7170808Sdelphij * This code is derived from software contributed to The NetBSD Foundation 8170808Sdelphij * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9170808Sdelphij * 2005 program. 10170808Sdelphij * 11170808Sdelphij * Redistribution and use in source and binary forms, with or without 12170808Sdelphij * modification, are permitted provided that the following conditions 13170808Sdelphij * are met: 14170808Sdelphij * 1. Redistributions of source code must retain the above copyright 15170808Sdelphij * notice, this list of conditions and the following disclaimer. 16170808Sdelphij * 2. Redistributions in binary form must reproduce the above copyright 17170808Sdelphij * notice, this list of conditions and the following disclaimer in the 18170808Sdelphij * documentation and/or other materials provided with the distribution. 19170808Sdelphij * 3. All advertising materials mentioning features or use of this software 20170808Sdelphij * must display the following acknowledgement: 21170808Sdelphij * This product includes software developed by the NetBSD 22170808Sdelphij * Foundation, Inc. and its contributors. 23170808Sdelphij * 4. Neither the name of The NetBSD Foundation nor the names of its 24170808Sdelphij * contributors may be used to endorse or promote products derived 25170808Sdelphij * from this software without specific prior written permission. 26170808Sdelphij * 27170808Sdelphij * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28170808Sdelphij * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29170808Sdelphij * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30170808Sdelphij * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31170808Sdelphij * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32170808Sdelphij * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33170808Sdelphij * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34170808Sdelphij * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35170808Sdelphij * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36170808Sdelphij * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37170808Sdelphij * POSSIBILITY OF SUCH DAMAGE. 38170808Sdelphij */ 39170808Sdelphij 40170808Sdelphij/* 41170808Sdelphij * tmpfs vnode interface. 42170808Sdelphij */ 43170808Sdelphij#include <sys/cdefs.h> 44170808Sdelphij__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vnops.c 171069 2007-06-28 02:36:41Z delphij $"); 45170808Sdelphij 46170808Sdelphij#include <sys/param.h> 47170808Sdelphij#include <sys/fcntl.h> 48170808Sdelphij#include <sys/lockf.h> 49170808Sdelphij#include <sys/namei.h> 50170808Sdelphij#include <sys/priv.h> 51170808Sdelphij#include <sys/proc.h> 52170808Sdelphij#include <sys/resourcevar.h> 53170808Sdelphij#include <sys/stat.h> 54170808Sdelphij#include <sys/systm.h> 55170808Sdelphij#include <sys/unistd.h> 56170808Sdelphij#include <sys/vnode.h> 57170808Sdelphij 58170808Sdelphij#include <vm/vm.h> 59170808Sdelphij#include <vm/vm_object.h> 60170808Sdelphij#include <vm/vm_page.h> 61170808Sdelphij#include <vm/vm_pager.h> 62170808Sdelphij#include <sys/sched.h> 63170808Sdelphij#include <sys/sf_buf.h> 64170808Sdelphij#include <machine/_inttypes.h> 65170808Sdelphij 66170808Sdelphij#include <fs/fifofs/fifo.h> 67170808Sdelphij#include <fs/tmpfs/tmpfs_vnops.h> 68170808Sdelphij#include <fs/tmpfs/tmpfs.h> 69170808Sdelphij 70170808Sdelphij/* --------------------------------------------------------------------- */ 71170808Sdelphij 72171069Sdelphijstatic int 73170808Sdelphijtmpfs_lookup(struct vop_cachedlookup_args *v) 74170808Sdelphij{ 75170808Sdelphij struct vnode *dvp = v->a_dvp; 76170808Sdelphij struct vnode **vpp = v->a_vpp; 77170808Sdelphij struct componentname *cnp = v->a_cnp; 78170808Sdelphij struct thread *td = cnp->cn_thread; 79170808Sdelphij 80170808Sdelphij int error; 81170808Sdelphij struct tmpfs_dirent *de; 82170808Sdelphij struct tmpfs_node *dnode; 83170808Sdelphij 84170808Sdelphij dnode = VP_TO_TMPFS_DIR(dvp); 85170808Sdelphij *vpp = NULLVP; 86170808Sdelphij 87170808Sdelphij /* Check accessibility of requested node as a first step. */ 88170808Sdelphij error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 89170808Sdelphij if (error != 0) 90170808Sdelphij goto out; 91170808Sdelphij 92170808Sdelphij /* We cannot be requesting the parent directory of the root node. */ 93170808Sdelphij MPASS(IMPLIES(dnode->tn_type == VDIR && 94170808Sdelphij dnode->tn_dir.tn_parent == dnode, 95170808Sdelphij !(cnp->cn_flags & ISDOTDOT))); 96170808Sdelphij 97170808Sdelphij if (cnp->cn_flags & ISDOTDOT) { 98170808Sdelphij VOP_UNLOCK(dvp, 0, td); 99170808Sdelphij 100170808Sdelphij /* Allocate a new vnode on the matching entry. */ 101170808Sdelphij error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, vpp, td); 102170808Sdelphij 103170808Sdelphij vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 104170808Sdelphij 105170808Sdelphij dnode->tn_dir.tn_parent->tn_lookup_dirent = NULL; 106170808Sdelphij } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 107170808Sdelphij VREF(dvp); 108170808Sdelphij *vpp = dvp; 109170808Sdelphij dnode->tn_lookup_dirent = NULL; 110170808Sdelphij error = 0; 111170808Sdelphij } else { 112170808Sdelphij de = tmpfs_dir_lookup(dnode, cnp); 113170808Sdelphij if (de == NULL) { 114170808Sdelphij /* The entry was not found in the directory. 115170808Sdelphij * This is OK if we are creating or renaming an 116170808Sdelphij * entry and are working on the last component of 117170808Sdelphij * the path name. */ 118170808Sdelphij if ((cnp->cn_flags & ISLASTCN) && 119170808Sdelphij (cnp->cn_nameiop == CREATE || \ 120170808Sdelphij cnp->cn_nameiop == RENAME)) { 121170808Sdelphij error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 122170808Sdelphij cnp->cn_thread); 123170808Sdelphij if (error != 0) 124170808Sdelphij goto out; 125170808Sdelphij 126170808Sdelphij /* Keep the component name in the buffer for 127170808Sdelphij * future uses. */ 128170808Sdelphij cnp->cn_flags |= SAVENAME; 129170808Sdelphij 130170808Sdelphij error = EJUSTRETURN; 131170808Sdelphij } else 132170808Sdelphij error = ENOENT; 133170808Sdelphij } else { 134170808Sdelphij struct tmpfs_node *tnode; 135170808Sdelphij 136170808Sdelphij /* The entry was found, so get its associated 137170808Sdelphij * tmpfs_node. */ 138170808Sdelphij tnode = de->td_node; 139170808Sdelphij 140170808Sdelphij /* If we are not at the last path component and 141170808Sdelphij * found a non-directory or non-link entry (which 142170808Sdelphij * may itself be pointing to a directory), raise 143170808Sdelphij * an error. */ 144170808Sdelphij if ((tnode->tn_type != VDIR && 145170808Sdelphij tnode->tn_type != VLNK) && 146170808Sdelphij !(cnp->cn_flags & ISLASTCN)) { 147170808Sdelphij error = ENOTDIR; 148170808Sdelphij goto out; 149170808Sdelphij } 150170808Sdelphij 151170808Sdelphij /* If we are deleting or renaming the entry, keep 152170808Sdelphij * track of its tmpfs_dirent so that it can be 153170808Sdelphij * easily deleted later. */ 154170808Sdelphij if ((cnp->cn_flags & ISLASTCN) && 155170808Sdelphij (cnp->cn_nameiop == DELETE || 156170808Sdelphij cnp->cn_nameiop == RENAME)) { 157170808Sdelphij error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 158170808Sdelphij cnp->cn_thread); 159170808Sdelphij if (error != 0) 160170808Sdelphij goto out; 161170808Sdelphij 162170808Sdelphij /* Allocate a new vnode on the matching entry. */ 163170808Sdelphij error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp, td); 164170808Sdelphij if (error != 0) 165170808Sdelphij goto out; 166170808Sdelphij 167170808Sdelphij if ((dnode->tn_mode & S_ISTXT) && 168170808Sdelphij VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 169170808Sdelphij VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 170170808Sdelphij error = EPERM; 171170808Sdelphij vput(*vpp); 172170808Sdelphij *vpp = NULL; 173170808Sdelphij goto out; 174170808Sdelphij } 175170808Sdelphij tnode->tn_lookup_dirent = de; 176170808Sdelphij cnp->cn_flags |= SAVENAME; 177170808Sdelphij } 178170808Sdelphij else 179170808Sdelphij error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp, td); 180170808Sdelphij 181170808Sdelphij } 182170808Sdelphij } 183170808Sdelphij 184170808Sdelphij /* Store the result of this lookup in the cache. Avoid this if the 185170808Sdelphij * request was for creation, as it does not improve timings on 186170808Sdelphij * emprical tests. */ 187170808Sdelphij if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 188170808Sdelphij cache_enter(dvp, *vpp, cnp); 189170808Sdelphij 190170808Sdelphijout: 191170808Sdelphij /* If there were no errors, *vpp cannot be null and it must be 192170808Sdelphij * locked. */ 193170808Sdelphij MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp, td))); 194170808Sdelphij 195170808Sdelphij return error; 196170808Sdelphij} 197170808Sdelphij 198170808Sdelphij/* --------------------------------------------------------------------- */ 199170808Sdelphij 200171069Sdelphijstatic int 201170808Sdelphijtmpfs_create(struct vop_create_args *v) 202170808Sdelphij{ 203170808Sdelphij struct vnode *dvp = v->a_dvp; 204170808Sdelphij struct vnode **vpp = v->a_vpp; 205170808Sdelphij struct componentname *cnp = v->a_cnp; 206170808Sdelphij struct vattr *vap = v->a_vap; 207170808Sdelphij 208170808Sdelphij MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 209170808Sdelphij 210170808Sdelphij return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 211170808Sdelphij} 212170808Sdelphij/* --------------------------------------------------------------------- */ 213170808Sdelphij 214171069Sdelphijstatic int 215170808Sdelphijtmpfs_mknod(struct vop_mknod_args *v) 216170808Sdelphij{ 217170808Sdelphij struct vnode *dvp = v->a_dvp; 218170808Sdelphij struct vnode **vpp = v->a_vpp; 219170808Sdelphij struct componentname *cnp = v->a_cnp; 220170808Sdelphij struct vattr *vap = v->a_vap; 221170808Sdelphij 222170808Sdelphij if (vap->va_type != VBLK && vap->va_type != VCHR && 223170808Sdelphij vap->va_type != VFIFO) 224170808Sdelphij return EINVAL; 225170808Sdelphij 226170808Sdelphij return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 227170808Sdelphij} 228170808Sdelphij 229170808Sdelphij/* --------------------------------------------------------------------- */ 230170808Sdelphij 231171069Sdelphijstatic int 232170808Sdelphijtmpfs_open(struct vop_open_args *v) 233170808Sdelphij{ 234170808Sdelphij struct vnode *vp = v->a_vp; 235170808Sdelphij int mode = v->a_mode; 236170808Sdelphij 237170808Sdelphij int error; 238170808Sdelphij struct tmpfs_node *node; 239170808Sdelphij 240170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_td)); 241170808Sdelphij 242170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 243170808Sdelphij 244170808Sdelphij /* The file is still active but all its names have been removed 245170808Sdelphij * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 246170808Sdelphij * it is about to die. */ 247170808Sdelphij if (node->tn_links < 1) 248170808Sdelphij return (ENOENT); 249170808Sdelphij 250170808Sdelphij /* If the file is marked append-only, deny write requests. */ 251170808Sdelphij if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 252170808Sdelphij error = EPERM; 253170808Sdelphij else { 254170808Sdelphij error = 0; 255170808Sdelphij vnode_create_vobject(vp, node->tn_size, v->a_td); 256170808Sdelphij } 257170808Sdelphij 258170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_td)); 259170808Sdelphij return error; 260170808Sdelphij} 261170808Sdelphij 262170808Sdelphij/* --------------------------------------------------------------------- */ 263170808Sdelphij 264171069Sdelphijstatic int 265170808Sdelphijtmpfs_close(struct vop_close_args *v) 266170808Sdelphij{ 267170808Sdelphij struct vnode *vp = v->a_vp; 268170808Sdelphij 269170808Sdelphij struct tmpfs_node *node; 270170808Sdelphij 271170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_td)); 272170808Sdelphij 273170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 274170808Sdelphij 275170808Sdelphij if (node->tn_links > 0) { 276170808Sdelphij /* Update node times. No need to do it if the node has 277170808Sdelphij * been deleted, because it will vanish after we return. */ 278170808Sdelphij tmpfs_update(vp); 279170808Sdelphij } 280170808Sdelphij 281170808Sdelphij return 0; 282170808Sdelphij} 283170808Sdelphij 284170808Sdelphij/* --------------------------------------------------------------------- */ 285170808Sdelphij 286170808Sdelphijint 287170808Sdelphijtmpfs_access(struct vop_access_args *v) 288170808Sdelphij{ 289170808Sdelphij struct vnode *vp = v->a_vp; 290170808Sdelphij int mode = v->a_mode; 291170808Sdelphij struct ucred *cred = v->a_cred; 292170808Sdelphij 293170808Sdelphij int error; 294170808Sdelphij struct tmpfs_node *node; 295170808Sdelphij 296170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_td)); 297170808Sdelphij 298170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 299170808Sdelphij 300170808Sdelphij switch (vp->v_type) { 301170808Sdelphij case VDIR: 302170808Sdelphij /* FALLTHROUGH */ 303170808Sdelphij case VLNK: 304170808Sdelphij /* FALLTHROUGH */ 305170808Sdelphij case VREG: 306170808Sdelphij if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 307170808Sdelphij error = EROFS; 308170808Sdelphij goto out; 309170808Sdelphij } 310170808Sdelphij break; 311170808Sdelphij 312170808Sdelphij case VBLK: 313170808Sdelphij /* FALLTHROUGH */ 314170808Sdelphij case VCHR: 315170808Sdelphij /* FALLTHROUGH */ 316170808Sdelphij case VSOCK: 317170808Sdelphij /* FALLTHROUGH */ 318170808Sdelphij case VFIFO: 319170808Sdelphij break; 320170808Sdelphij 321170808Sdelphij default: 322170808Sdelphij error = EINVAL; 323170808Sdelphij goto out; 324170808Sdelphij } 325170808Sdelphij 326170808Sdelphij if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 327170808Sdelphij error = EPERM; 328170808Sdelphij goto out; 329170808Sdelphij } 330170808Sdelphij 331170808Sdelphij error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 332170808Sdelphij node->tn_gid, mode, cred, NULL); 333170808Sdelphij 334170808Sdelphijout: 335170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_td)); 336170808Sdelphij 337170808Sdelphij return error; 338170808Sdelphij} 339170808Sdelphij 340170808Sdelphij/* --------------------------------------------------------------------- */ 341170808Sdelphij 342170808Sdelphijint 343170808Sdelphijtmpfs_getattr(struct vop_getattr_args *v) 344170808Sdelphij{ 345170808Sdelphij struct vnode *vp = v->a_vp; 346170808Sdelphij struct vattr *vap = v->a_vap; 347170808Sdelphij 348170808Sdelphij struct tmpfs_node *node; 349170808Sdelphij 350170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 351170808Sdelphij 352170808Sdelphij VATTR_NULL(vap); 353170808Sdelphij 354170808Sdelphij tmpfs_update(vp); 355170808Sdelphij 356170808Sdelphij vap->va_type = vp->v_type; 357170808Sdelphij vap->va_mode = node->tn_mode; 358170808Sdelphij vap->va_nlink = node->tn_links; 359170808Sdelphij vap->va_uid = node->tn_uid; 360170808Sdelphij vap->va_gid = node->tn_gid; 361170808Sdelphij vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 362170808Sdelphij vap->va_fileid = node->tn_id; 363170808Sdelphij vap->va_size = node->tn_size; 364170808Sdelphij vap->va_blocksize = PAGE_SIZE; 365170808Sdelphij vap->va_atime = node->tn_atime; 366170808Sdelphij vap->va_mtime = node->tn_mtime; 367170808Sdelphij vap->va_ctime = node->tn_ctime; 368170808Sdelphij vap->va_birthtime = node->tn_birthtime; 369170808Sdelphij vap->va_gen = node->tn_gen; 370170808Sdelphij vap->va_flags = node->tn_flags; 371170808Sdelphij vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 372170808Sdelphij node->tn_rdev : VNOVAL; 373170808Sdelphij vap->va_bytes = round_page(node->tn_size); 374170808Sdelphij vap->va_filerev = VNOVAL; 375170808Sdelphij vap->va_vaflags = 0; 376170808Sdelphij vap->va_spare = VNOVAL; /* XXX */ 377170808Sdelphij 378170808Sdelphij return 0; 379170808Sdelphij} 380170808Sdelphij 381170808Sdelphij/* --------------------------------------------------------------------- */ 382170808Sdelphij 383170808Sdelphij/* XXX Should this operation be atomic? I think it should, but code in 384170808Sdelphij * XXX other places (e.g., ufs) doesn't seem to be... */ 385170808Sdelphijint 386170808Sdelphijtmpfs_setattr(struct vop_setattr_args *v) 387170808Sdelphij{ 388170808Sdelphij struct vnode *vp = v->a_vp; 389170808Sdelphij struct vattr *vap = v->a_vap; 390170808Sdelphij struct ucred *cred = v->a_cred; 391170808Sdelphij struct thread *l = v->a_td; 392170808Sdelphij 393170808Sdelphij int error; 394170808Sdelphij 395170808Sdelphij MPASS(VOP_ISLOCKED(vp, l)); 396170808Sdelphij 397170808Sdelphij error = 0; 398170808Sdelphij 399170808Sdelphij /* Abort if any unsettable attribute is given. */ 400170808Sdelphij if (vap->va_type != VNON || 401170808Sdelphij vap->va_nlink != VNOVAL || 402170808Sdelphij vap->va_fsid != VNOVAL || 403170808Sdelphij vap->va_fileid != VNOVAL || 404170808Sdelphij vap->va_blocksize != VNOVAL || 405170808Sdelphij vap->va_gen != VNOVAL || 406170808Sdelphij vap->va_rdev != VNOVAL || 407170808Sdelphij vap->va_bytes != VNOVAL) 408170808Sdelphij error = EINVAL; 409170808Sdelphij 410170808Sdelphij if (error == 0 && (vap->va_flags != VNOVAL)) 411170808Sdelphij error = tmpfs_chflags(vp, vap->va_flags, cred, l); 412170808Sdelphij 413170808Sdelphij if (error == 0 && (vap->va_size != VNOVAL)) 414170808Sdelphij error = tmpfs_chsize(vp, vap->va_size, cred, l); 415170808Sdelphij 416170808Sdelphij if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 417170808Sdelphij error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, 418170808Sdelphij l); 419170808Sdelphij 420170808Sdelphij if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 421170808Sdelphij error = tmpfs_chmod(vp, vap->va_mode, cred, l); 422170808Sdelphij 423170808Sdelphij if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 424170808Sdelphij vap->va_atime.tv_nsec != VNOVAL) || 425170808Sdelphij (vap->va_mtime.tv_sec != VNOVAL && 426170808Sdelphij vap->va_mtime.tv_nsec != VNOVAL) || 427170808Sdelphij (vap->va_birthtime.tv_sec != VNOVAL && 428170808Sdelphij vap->va_birthtime.tv_nsec != VNOVAL))) 429170808Sdelphij error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 430170808Sdelphij &vap->va_birthtime, vap->va_vaflags, cred, l); 431170808Sdelphij 432170808Sdelphij /* Update the node times. We give preference to the error codes 433170808Sdelphij * generated by this function rather than the ones that may arise 434170808Sdelphij * from tmpfs_update. */ 435170808Sdelphij tmpfs_update(vp); 436170808Sdelphij 437170808Sdelphij MPASS(VOP_ISLOCKED(vp, l)); 438170808Sdelphij 439170808Sdelphij return error; 440170808Sdelphij} 441170808Sdelphij 442170808Sdelphij/* --------------------------------------------------------------------- */ 443170808Sdelphijstatic int 444170808Sdelphijtmpfs_uio_xfer(struct tmpfs_mount *tmp, struct tmpfs_node *node, 445170808Sdelphij struct uio *uio, vm_object_t uobj) 446170808Sdelphij{ 447170808Sdelphij struct sf_buf *sf; 448170808Sdelphij vm_pindex_t idx; 449170808Sdelphij vm_offset_t d; 450170808Sdelphij vm_page_t m; 451170808Sdelphij size_t len; 452170808Sdelphij int error = 0; 453170808Sdelphij 454170808Sdelphij /* uobj - locked by caller */ 455170808Sdelphij 456170808Sdelphij VM_OBJECT_LOCK(uobj); 457170808Sdelphij vm_object_pip_add(uobj, 1); 458170808Sdelphij while (error == 0 && uio->uio_resid > 0) { 459170808Sdelphij if (node->tn_size <= uio->uio_offset) 460170808Sdelphij break; 461170808Sdelphij 462170808Sdelphij len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 463170808Sdelphij if (len == 0) 464170808Sdelphij break; 465170808Sdelphij 466170808Sdelphij idx = OFF_TO_IDX(uio->uio_offset); 467170808Sdelphij d = uio->uio_offset - IDX_TO_OFF(idx); 468170808Sdelphij len = MIN(len, (PAGE_SIZE - d)); 469171029Sdelphij m = vm_page_grab(uobj, idx, VM_ALLOC_WIRED | VM_ALLOC_ZERO | 470171029Sdelphij VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 471170808Sdelphij if (uio->uio_rw == UIO_READ && m->valid != VM_PAGE_BITS_ALL) 472171029Sdelphij vm_page_zero_invalid(m, TRUE); 473170808Sdelphij VM_OBJECT_UNLOCK(uobj); 474170808Sdelphij sched_pin(); 475170808Sdelphij sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 476170808Sdelphij error = uiomove((void *)(sf_buf_kva(sf) + d), len, uio); 477170808Sdelphij sf_buf_free(sf); 478170808Sdelphij sched_unpin(); 479170808Sdelphij VM_OBJECT_LOCK(uobj); 480170808Sdelphij vm_page_lock_queues(); 481170808Sdelphij if (error == 0 && uio->uio_rw == UIO_WRITE) { 482170808Sdelphij vm_page_set_validclean(m, d, len); 483170808Sdelphij vm_page_zero_invalid(m, TRUE); 484170808Sdelphij vm_page_dirty(m); 485170808Sdelphij } 486171029Sdelphij vm_page_unwire(m, 0); 487170808Sdelphij vm_page_activate(m); 488170808Sdelphij vm_page_wakeup(m); 489170808Sdelphij vm_page_unlock_queues(); 490170808Sdelphij } 491170808Sdelphij vm_object_pip_subtract(uobj, 1); 492170808Sdelphij VM_OBJECT_UNLOCK(uobj); 493170808Sdelphij return error; 494170808Sdelphij} 495170808Sdelphij 496171069Sdelphijstatic int 497170808Sdelphijtmpfs_read(struct vop_read_args *v) 498170808Sdelphij{ 499170808Sdelphij struct vnode *vp = v->a_vp; 500170808Sdelphij struct uio *uio = v->a_uio; 501170808Sdelphij 502170808Sdelphij struct tmpfs_node *node; 503170808Sdelphij vm_object_t uobj; 504170808Sdelphij 505170808Sdelphij int error; 506170808Sdelphij 507170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 508170808Sdelphij 509170808Sdelphij if (vp->v_type != VREG) { 510170808Sdelphij error = EISDIR; 511170808Sdelphij goto out; 512170808Sdelphij } 513170808Sdelphij 514170808Sdelphij if (uio->uio_offset < 0) { 515170808Sdelphij error = EINVAL; 516170808Sdelphij goto out; 517170808Sdelphij } 518170808Sdelphij 519170808Sdelphij node->tn_status |= TMPFS_NODE_ACCESSED; 520170808Sdelphij 521170808Sdelphij uobj = node->tn_reg.tn_aobj; 522170808Sdelphij error = tmpfs_uio_xfer(VFS_TO_TMPFS(vp->v_mount), node, uio, uobj); 523170808Sdelphij 524170808Sdelphijout: 525170808Sdelphij 526170808Sdelphij return error; 527170808Sdelphij} 528170808Sdelphij 529170808Sdelphij/* --------------------------------------------------------------------- */ 530170808Sdelphij 531171069Sdelphijstatic int 532170808Sdelphijtmpfs_write(struct vop_write_args *v) 533170808Sdelphij{ 534170808Sdelphij struct vnode *vp = v->a_vp; 535170808Sdelphij struct uio *uio = v->a_uio; 536170808Sdelphij int ioflag = v->a_ioflag; 537170808Sdelphij struct thread *td = uio->uio_td; 538170808Sdelphij 539170808Sdelphij boolean_t extended; 540170808Sdelphij int error; 541170808Sdelphij off_t oldsize; 542170808Sdelphij struct tmpfs_node *node; 543170808Sdelphij vm_object_t uobj; 544170808Sdelphij 545170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 546170808Sdelphij oldsize = node->tn_size; 547170808Sdelphij 548170808Sdelphij if (uio->uio_offset < 0 || vp->v_type != VREG) { 549170808Sdelphij error = EINVAL; 550170808Sdelphij goto out; 551170808Sdelphij } 552170808Sdelphij 553170808Sdelphij if (uio->uio_resid == 0) { 554170808Sdelphij error = 0; 555170808Sdelphij goto out; 556170808Sdelphij } 557170808Sdelphij 558170808Sdelphij if (ioflag & IO_APPEND) 559170808Sdelphij uio->uio_offset = node->tn_size; 560170808Sdelphij 561170808Sdelphij if (uio->uio_offset + uio->uio_resid > 562170808Sdelphij VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 563170808Sdelphij return (EFBIG); 564170808Sdelphij 565170808Sdelphij if (vp->v_type == VREG && td != NULL) { 566170808Sdelphij PROC_LOCK(td->td_proc); 567170808Sdelphij if (uio->uio_offset + uio->uio_resid > 568170808Sdelphij lim_cur(td->td_proc, RLIMIT_FSIZE)) { 569170808Sdelphij psignal(td->td_proc, SIGXFSZ); 570170808Sdelphij PROC_UNLOCK(td->td_proc); 571170808Sdelphij return (EFBIG); 572170808Sdelphij } 573170808Sdelphij PROC_UNLOCK(td->td_proc); 574170808Sdelphij } 575170808Sdelphij 576170808Sdelphij extended = uio->uio_offset + uio->uio_resid > node->tn_size; 577170808Sdelphij if (extended) { 578170808Sdelphij error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 579170808Sdelphij if (error != 0) 580170808Sdelphij goto out; 581170808Sdelphij } 582170808Sdelphij 583170808Sdelphij uobj = node->tn_reg.tn_aobj; 584170808Sdelphij error = tmpfs_uio_xfer(VFS_TO_TMPFS(vp->v_mount), node, uio, uobj); 585170808Sdelphij 586170808Sdelphij node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 587170808Sdelphij (extended ? TMPFS_NODE_CHANGED : 0); 588170808Sdelphij 589170808Sdelphij if (node->tn_mode & (S_ISUID | S_ISGID)) { 590170808Sdelphij if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 591170808Sdelphij node->tn_mode &= ~(S_ISUID | S_ISGID); 592170808Sdelphij } 593170808Sdelphij 594170808Sdelphij if (error != 0) 595170808Sdelphij (void)tmpfs_reg_resize(vp, oldsize); 596170808Sdelphij 597170808Sdelphijout: 598170808Sdelphij MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 599170808Sdelphij MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 600170808Sdelphij 601170808Sdelphij return error; 602170808Sdelphij} 603170808Sdelphij 604170808Sdelphij/* --------------------------------------------------------------------- */ 605170808Sdelphij 606171069Sdelphijstatic int 607170808Sdelphijtmpfs_fsync(struct vop_fsync_args *v) 608170808Sdelphij{ 609170808Sdelphij struct vnode *vp = v->a_vp; 610170808Sdelphij 611170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_td)); 612170808Sdelphij 613170808Sdelphij tmpfs_update(vp); 614170808Sdelphij 615170808Sdelphij return 0; 616170808Sdelphij} 617170808Sdelphij 618170808Sdelphij/* --------------------------------------------------------------------- */ 619170808Sdelphij 620171069Sdelphijstatic int 621170808Sdelphijtmpfs_remove(struct vop_remove_args *v) 622170808Sdelphij{ 623170808Sdelphij struct vnode *dvp = v->a_dvp; 624170808Sdelphij struct vnode *vp = v->a_vp; 625170808Sdelphij 626170808Sdelphij int error; 627170808Sdelphij struct tmpfs_dirent *de; 628170808Sdelphij struct tmpfs_mount *tmp; 629170808Sdelphij struct tmpfs_node *dnode; 630170808Sdelphij struct tmpfs_node *node; 631170808Sdelphij 632170808Sdelphij MPASS(VOP_ISLOCKED(dvp, v->a_cnp->cn_thread)); 633170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_cnp->cn_thread)); 634170808Sdelphij 635170808Sdelphij if (vp->v_type == VDIR) { 636170808Sdelphij error = EISDIR; 637170808Sdelphij goto out; 638170808Sdelphij } 639170808Sdelphij 640170808Sdelphij dnode = VP_TO_TMPFS_DIR(dvp); 641170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 642170808Sdelphij tmp = VFS_TO_TMPFS(vp->v_mount); 643170808Sdelphij de = node->tn_lookup_dirent; 644170808Sdelphij MPASS(de != NULL); 645170808Sdelphij 646170808Sdelphij /* Files marked as immutable or append-only cannot be deleted. */ 647170808Sdelphij if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 648170808Sdelphij (dnode->tn_flags & APPEND)) { 649170808Sdelphij error = EPERM; 650170808Sdelphij goto out; 651170808Sdelphij } 652170808Sdelphij 653170808Sdelphij /* Remove the entry from the directory; as it is a file, we do not 654170808Sdelphij * have to change the number of hard links of the directory. */ 655170808Sdelphij tmpfs_dir_detach(dvp, de); 656170808Sdelphij 657170808Sdelphij /* Free the directory entry we just deleted. Note that the node 658170808Sdelphij * referred by it will not be removed until the vnode is really 659170808Sdelphij * reclaimed. */ 660170808Sdelphij tmpfs_free_dirent(tmp, de, TRUE); 661170808Sdelphij 662170808Sdelphij if (node->tn_links > 0) 663170808Sdelphij node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 664170808Sdelphij TMPFS_NODE_MODIFIED; 665170808Sdelphij error = 0; 666170808Sdelphij 667170808Sdelphijout: 668170808Sdelphij 669170808Sdelphij return error; 670170808Sdelphij} 671170808Sdelphij 672170808Sdelphij/* --------------------------------------------------------------------- */ 673170808Sdelphij 674171069Sdelphijstatic int 675170808Sdelphijtmpfs_link(struct vop_link_args *v) 676170808Sdelphij{ 677170808Sdelphij struct vnode *dvp = v->a_tdvp; 678170808Sdelphij struct vnode *vp = v->a_vp; 679170808Sdelphij struct componentname *cnp = v->a_cnp; 680170808Sdelphij 681170808Sdelphij int error; 682170808Sdelphij struct tmpfs_dirent *de; 683170808Sdelphij struct tmpfs_node *dnode; 684170808Sdelphij struct tmpfs_node *node; 685170808Sdelphij 686170808Sdelphij MPASS(VOP_ISLOCKED(dvp, cnp->cn_thread)); 687170808Sdelphij MPASS(cnp->cn_flags & HASBUF); 688170808Sdelphij MPASS(dvp != vp); /* XXX When can this be false? */ 689170808Sdelphij 690170808Sdelphij dnode = VP_TO_TMPFS_DIR(dvp); 691170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 692170808Sdelphij 693170808Sdelphij /* XXX: Why aren't the following two tests done by the caller? */ 694170808Sdelphij 695170808Sdelphij /* Hard links of directories are forbidden. */ 696170808Sdelphij if (vp->v_type == VDIR) { 697170808Sdelphij error = EPERM; 698170808Sdelphij goto out; 699170808Sdelphij } 700170808Sdelphij 701170808Sdelphij /* Cannot create cross-device links. */ 702170808Sdelphij if (dvp->v_mount != vp->v_mount) { 703170808Sdelphij error = EXDEV; 704170808Sdelphij goto out; 705170808Sdelphij } 706170808Sdelphij 707170808Sdelphij /* Ensure that we do not overflow the maximum number of links imposed 708170808Sdelphij * by the system. */ 709170808Sdelphij MPASS(node->tn_links <= LINK_MAX); 710170808Sdelphij if (node->tn_links == LINK_MAX) { 711170808Sdelphij error = EMLINK; 712170808Sdelphij goto out; 713170808Sdelphij } 714170808Sdelphij 715170808Sdelphij /* We cannot create links of files marked immutable or append-only. */ 716170808Sdelphij if (node->tn_flags & (IMMUTABLE | APPEND)) { 717170808Sdelphij error = EPERM; 718170808Sdelphij goto out; 719170808Sdelphij } 720170808Sdelphij 721170808Sdelphij /* Allocate a new directory entry to represent the node. */ 722170808Sdelphij error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 723170808Sdelphij cnp->cn_nameptr, cnp->cn_namelen, &de); 724170808Sdelphij if (error != 0) 725170808Sdelphij goto out; 726170808Sdelphij 727170808Sdelphij /* Insert the new directory entry into the appropriate directory. */ 728170808Sdelphij tmpfs_dir_attach(dvp, de); 729170808Sdelphij 730170808Sdelphij /* vp link count has changed, so update node times. */ 731170808Sdelphij node->tn_status |= TMPFS_NODE_CHANGED; 732170808Sdelphij tmpfs_update(vp); 733170808Sdelphij 734170808Sdelphij error = 0; 735171069Sdelphij 736170808Sdelphijout: 737170808Sdelphij return error; 738170808Sdelphij} 739170808Sdelphij 740170808Sdelphij/* --------------------------------------------------------------------- */ 741170808Sdelphij 742171069Sdelphijstatic int 743170808Sdelphijtmpfs_rename(struct vop_rename_args *v) 744170808Sdelphij{ 745170808Sdelphij struct vnode *fdvp = v->a_fdvp; 746170808Sdelphij struct vnode *fvp = v->a_fvp; 747170808Sdelphij struct componentname *fcnp = v->a_fcnp; 748170808Sdelphij struct vnode *tdvp = v->a_tdvp; 749170808Sdelphij struct vnode *tvp = v->a_tvp; 750170808Sdelphij struct componentname *tcnp = v->a_tcnp; 751170808Sdelphij struct tmpfs_node *tnode = 0; /* pacify gcc */ 752170808Sdelphij 753170808Sdelphij char *newname; 754170808Sdelphij int error; 755170808Sdelphij struct tmpfs_dirent *de; 756170808Sdelphij struct tmpfs_mount *tmp; 757170808Sdelphij struct tmpfs_node *fdnode; 758170808Sdelphij struct tmpfs_node *fnode; 759170808Sdelphij struct tmpfs_node *tdnode; 760170808Sdelphij 761170808Sdelphij MPASS(VOP_ISLOCKED(tdvp, tcnp->cn_thread)); 762170808Sdelphij MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp, tcnp->cn_thread))); 763170808Sdelphij MPASS(fcnp->cn_flags & HASBUF); 764170808Sdelphij MPASS(tcnp->cn_flags & HASBUF); 765170808Sdelphij 766170808Sdelphij fdnode = VP_TO_TMPFS_DIR(fdvp); 767170808Sdelphij fnode = VP_TO_TMPFS_NODE(fvp); 768170808Sdelphij de = fnode->tn_lookup_dirent; 769170808Sdelphij 770170808Sdelphij /* Disallow cross-device renames. 771170808Sdelphij * XXX Why isn't this done by the caller? */ 772170808Sdelphij if (fvp->v_mount != tdvp->v_mount || 773170808Sdelphij (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 774170808Sdelphij error = EXDEV; 775170808Sdelphij goto out; 776170808Sdelphij } 777170808Sdelphij 778170808Sdelphij tmp = VFS_TO_TMPFS(tdvp->v_mount); 779170808Sdelphij tdnode = VP_TO_TMPFS_DIR(tdvp); 780170808Sdelphij 781170808Sdelphij /* If source and target are the same file, there is nothing to do. */ 782170808Sdelphij if (fvp == tvp) { 783170808Sdelphij error = 0; 784170808Sdelphij goto out; 785170808Sdelphij } 786170808Sdelphij 787170808Sdelphij /* Avoid manipulating '.' and '..' entries. */ 788170808Sdelphij if (de == NULL) { 789170808Sdelphij MPASS(fvp->v_type == VDIR); 790170808Sdelphij error = EINVAL; 791170808Sdelphij goto out; 792170808Sdelphij } 793170808Sdelphij MPASS(de->td_node == fnode); 794170808Sdelphij 795170808Sdelphij /* If re-naming a directory to another preexisting directory 796170808Sdelphij * ensure that the target directory is empty so that its 797170808Sdelphij * removal causes no side effects. 798170808Sdelphij * Kern_rename gurantees the destination to be a directory 799170808Sdelphij * if the source is one. */ 800170808Sdelphij if (tvp != NULL) { 801170808Sdelphij tnode = VP_TO_TMPFS_NODE(tvp); 802170808Sdelphij 803170808Sdelphij if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 804170808Sdelphij (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 805170808Sdelphij error = EPERM; 806170808Sdelphij goto out; 807170808Sdelphij } 808170808Sdelphij 809170808Sdelphij if ((de->td_node->tn_type == VDIR) && (tnode->tn_size > 0)) { 810170808Sdelphij error = ENOTEMPTY; 811170808Sdelphij goto out; 812170808Sdelphij } 813170808Sdelphij } 814170808Sdelphij 815170808Sdelphij /* If we need to move the directory between entries, lock the 816170808Sdelphij * source so that we can safely operate on it. */ 817170808Sdelphij if (fdnode != tdnode) { 818170808Sdelphij error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY, tcnp->cn_thread); 819170808Sdelphij if (error != 0) 820170808Sdelphij goto out; 821170808Sdelphij } 822170808Sdelphij 823170808Sdelphij if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 824170808Sdelphij || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 825170808Sdelphij error = EPERM; 826170808Sdelphij goto out_locked; 827170808Sdelphij } 828170808Sdelphij 829170808Sdelphij /* Ensure that we have enough memory to hold the new name, if it 830170808Sdelphij * has to be changed. */ 831170808Sdelphij if (fcnp->cn_namelen != tcnp->cn_namelen || 832170808Sdelphij memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 833170808Sdelphij newname = tmpfs_str_zone_alloc(&tmp->tm_str_pool, M_WAITOK, 834170808Sdelphij tcnp->cn_namelen); 835170808Sdelphij if (newname == NULL) { 836170808Sdelphij error = ENOSPC; 837170808Sdelphij goto out_locked; 838170808Sdelphij } 839170808Sdelphij } else 840170808Sdelphij newname = NULL; 841170808Sdelphij 842170808Sdelphij /* If the node is being moved to another directory, we have to do 843170808Sdelphij * the move. */ 844170808Sdelphij if (fdnode != tdnode) { 845170808Sdelphij /* In case we are moving a directory, we have to adjust its 846170808Sdelphij * parent to point to the new parent. */ 847170808Sdelphij if (de->td_node->tn_type == VDIR) { 848170808Sdelphij struct tmpfs_node *n; 849170808Sdelphij 850170808Sdelphij /* Ensure the target directory is not a child of the 851170808Sdelphij * directory being moved. Otherwise, we'd end up 852170808Sdelphij * with stale nodes. */ 853170808Sdelphij n = tdnode; 854170808Sdelphij while (n != n->tn_dir.tn_parent) { 855170808Sdelphij if (n == fnode) { 856170808Sdelphij error = EINVAL; 857170808Sdelphij if (newname != NULL) 858170808Sdelphij tmpfs_str_zone_free(&tmp->tm_str_pool, 859170808Sdelphij newname, tcnp->cn_namelen); 860170808Sdelphij goto out_locked; 861170808Sdelphij } 862170808Sdelphij n = n->tn_dir.tn_parent; 863170808Sdelphij } 864170808Sdelphij 865170808Sdelphij /* Adjust the parent pointer. */ 866170808Sdelphij TMPFS_VALIDATE_DIR(fnode); 867170808Sdelphij de->td_node->tn_dir.tn_parent = tdnode; 868170808Sdelphij 869170808Sdelphij /* As a result of changing the target of the '..' 870170808Sdelphij * entry, the link count of the source and target 871170808Sdelphij * directories has to be adjusted. */ 872170808Sdelphij fdnode->tn_links--; 873170808Sdelphij tdnode->tn_links++; 874170808Sdelphij } 875170808Sdelphij 876170808Sdelphij /* Do the move: just remove the entry from the source directory 877170808Sdelphij * and insert it into the target one. */ 878170808Sdelphij tmpfs_dir_detach(fdvp, de); 879170808Sdelphij tmpfs_dir_attach(tdvp, de); 880170808Sdelphij } 881170808Sdelphij 882170808Sdelphij /* If the name has changed, we need to make it effective by changing 883170808Sdelphij * it in the directory entry. */ 884170808Sdelphij if (newname != NULL) { 885170808Sdelphij MPASS(tcnp->cn_namelen <= MAXNAMLEN); 886170808Sdelphij 887170808Sdelphij tmpfs_str_zone_free(&tmp->tm_str_pool, de->td_name, 888170808Sdelphij de->td_namelen); 889170808Sdelphij de->td_namelen = (uint16_t)tcnp->cn_namelen; 890170808Sdelphij memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 891170808Sdelphij de->td_name = newname; 892170808Sdelphij 893170808Sdelphij fnode->tn_status |= TMPFS_NODE_CHANGED; 894170808Sdelphij tdnode->tn_status |= TMPFS_NODE_MODIFIED; 895170808Sdelphij } 896170808Sdelphij 897170808Sdelphij /* If we are overwriting an entry, we have to remove the old one 898170808Sdelphij * from the target directory. */ 899170808Sdelphij if (tvp != NULL) { 900170808Sdelphij /* Remove the old entry from the target directory. */ 901170808Sdelphij de = tnode->tn_lookup_dirent; 902170808Sdelphij tmpfs_dir_detach(tdvp, de); 903170808Sdelphij 904170808Sdelphij /* Free the directory entry we just deleted. Note that the 905170808Sdelphij * node referred by it will not be removed until the vnode is 906170808Sdelphij * really reclaimed. */ 907170808Sdelphij tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 908170808Sdelphij } 909170808Sdelphij 910170808Sdelphij error = 0; 911170808Sdelphij 912170808Sdelphijout_locked: 913170808Sdelphij if (fdnode != tdnode) 914170808Sdelphij VOP_UNLOCK(fdvp, 0, tcnp->cn_thread); 915170808Sdelphij 916170808Sdelphijout: 917170808Sdelphij /* Release target nodes. */ 918170808Sdelphij /* XXX: I don't understand when tdvp can be the same as tvp, but 919170808Sdelphij * other code takes care of this... */ 920170808Sdelphij if (tdvp == tvp) 921170808Sdelphij vrele(tdvp); 922170808Sdelphij else 923170808Sdelphij vput(tdvp); 924170808Sdelphij if (tvp != NULL) 925170808Sdelphij vput(tvp); 926170808Sdelphij 927170808Sdelphij /* Release source nodes. */ 928170808Sdelphij vrele(fdvp); 929170808Sdelphij vrele(fvp); 930170808Sdelphij 931170808Sdelphij return error; 932170808Sdelphij} 933170808Sdelphij 934170808Sdelphij/* --------------------------------------------------------------------- */ 935170808Sdelphij 936171069Sdelphijstatic int 937170808Sdelphijtmpfs_mkdir(struct vop_mkdir_args *v) 938170808Sdelphij{ 939170808Sdelphij struct vnode *dvp = v->a_dvp; 940170808Sdelphij struct vnode **vpp = v->a_vpp; 941170808Sdelphij struct componentname *cnp = v->a_cnp; 942170808Sdelphij struct vattr *vap = v->a_vap; 943170808Sdelphij 944170808Sdelphij MPASS(vap->va_type == VDIR); 945170808Sdelphij 946170808Sdelphij return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 947170808Sdelphij} 948170808Sdelphij 949170808Sdelphij/* --------------------------------------------------------------------- */ 950170808Sdelphij 951171069Sdelphijstatic int 952170808Sdelphijtmpfs_rmdir(struct vop_rmdir_args *v) 953170808Sdelphij{ 954170808Sdelphij struct vnode *dvp = v->a_dvp; 955170808Sdelphij struct vnode *vp = v->a_vp; 956170808Sdelphij 957170808Sdelphij int error; 958170808Sdelphij struct tmpfs_dirent *de; 959170808Sdelphij struct tmpfs_mount *tmp; 960170808Sdelphij struct tmpfs_node *dnode; 961170808Sdelphij struct tmpfs_node *node; 962170808Sdelphij 963170808Sdelphij MPASS(VOP_ISLOCKED(dvp, v->a_cnp->cn_thread)); 964170808Sdelphij MPASS(VOP_ISLOCKED(vp, v->a_cnp->cn_thread)); 965170808Sdelphij 966170808Sdelphij tmp = VFS_TO_TMPFS(dvp->v_mount); 967170808Sdelphij dnode = VP_TO_TMPFS_DIR(dvp); 968170808Sdelphij node = VP_TO_TMPFS_DIR(vp); 969170808Sdelphij 970170808Sdelphij /* Directories with more than two entries ('.' and '..') cannot be 971170808Sdelphij * removed. */ 972170808Sdelphij if (node->tn_size > 0) { 973170808Sdelphij error = ENOTEMPTY; 974170808Sdelphij goto out; 975170808Sdelphij } 976170808Sdelphij 977170808Sdelphij if ((dnode->tn_flags & APPEND) 978170808Sdelphij || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 979170808Sdelphij error = EPERM; 980170808Sdelphij goto out; 981170808Sdelphij } 982170808Sdelphij 983170808Sdelphij /* This invariant holds only if we are not trying to remove "..". 984170808Sdelphij * We checked for that above so this is safe now. */ 985170808Sdelphij MPASS(node->tn_dir.tn_parent == dnode); 986170808Sdelphij 987170808Sdelphij /* Get the directory entry associated with node (vp). This was 988170808Sdelphij * filled by tmpfs_lookup while looking up the entry. */ 989170808Sdelphij de = node->tn_lookup_dirent; 990170808Sdelphij MPASS(TMPFS_DIRENT_MATCHES(de, 991170808Sdelphij v->a_cnp->cn_nameptr, 992170808Sdelphij v->a_cnp->cn_namelen)); 993170808Sdelphij 994170808Sdelphij /* Check flags to see if we are allowed to remove the directory. */ 995170808Sdelphij if (dnode->tn_flags & APPEND 996170808Sdelphij || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 997170808Sdelphij error = EPERM; 998170808Sdelphij goto out; 999170808Sdelphij } 1000170808Sdelphij 1001170808Sdelphij /* Detach the directory entry from the directory (dnode). */ 1002170808Sdelphij tmpfs_dir_detach(dvp, de); 1003170808Sdelphij 1004170808Sdelphij node->tn_links--; 1005170808Sdelphij node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1006170808Sdelphij TMPFS_NODE_MODIFIED; 1007170808Sdelphij node->tn_dir.tn_parent->tn_links--; 1008170808Sdelphij node->tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1009170808Sdelphij TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1010170808Sdelphij 1011170808Sdelphij cache_purge(dvp); 1012170808Sdelphij cache_purge(vp); 1013170808Sdelphij 1014170808Sdelphij /* Free the directory entry we just deleted. Note that the node 1015170808Sdelphij * referred by it will not be removed until the vnode is really 1016170808Sdelphij * reclaimed. */ 1017170808Sdelphij tmpfs_free_dirent(tmp, de, TRUE); 1018170808Sdelphij 1019170808Sdelphij /* Release the deleted vnode (will destroy the node, notify 1020170808Sdelphij * interested parties and clean it from the cache). */ 1021170808Sdelphij 1022170808Sdelphij dnode->tn_status |= TMPFS_NODE_CHANGED; 1023170808Sdelphij tmpfs_update(dvp); 1024170808Sdelphij 1025170808Sdelphij error = 0; 1026170808Sdelphij 1027170808Sdelphijout: 1028170808Sdelphij return error; 1029170808Sdelphij} 1030170808Sdelphij 1031170808Sdelphij/* --------------------------------------------------------------------- */ 1032170808Sdelphij 1033171069Sdelphijstatic int 1034170808Sdelphijtmpfs_symlink(struct vop_symlink_args *v) 1035170808Sdelphij{ 1036170808Sdelphij struct vnode *dvp = v->a_dvp; 1037170808Sdelphij struct vnode **vpp = v->a_vpp; 1038170808Sdelphij struct componentname *cnp = v->a_cnp; 1039170808Sdelphij struct vattr *vap = v->a_vap; 1040170808Sdelphij char *target = v->a_target; 1041170808Sdelphij 1042170808Sdelphij#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1043170808Sdelphij MPASS(vap->va_type == VLNK); 1044170808Sdelphij#else 1045170808Sdelphij vap->va_type = VLNK; 1046170808Sdelphij#endif 1047170808Sdelphij 1048170808Sdelphij return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1049170808Sdelphij} 1050170808Sdelphij 1051170808Sdelphij/* --------------------------------------------------------------------- */ 1052170808Sdelphij 1053171069Sdelphijstatic int 1054170808Sdelphijtmpfs_readdir(struct vop_readdir_args *v) 1055170808Sdelphij{ 1056170808Sdelphij struct vnode *vp = v->a_vp; 1057170808Sdelphij struct uio *uio = v->a_uio; 1058170808Sdelphij int *eofflag = v->a_eofflag; 1059170808Sdelphij u_long **cookies = v->a_cookies; 1060170808Sdelphij int *ncookies = v->a_ncookies; 1061170808Sdelphij 1062170808Sdelphij int error; 1063170808Sdelphij off_t startoff; 1064170808Sdelphij off_t cnt; 1065170808Sdelphij struct tmpfs_node *node; 1066170808Sdelphij 1067170808Sdelphij /* This operation only makes sense on directory nodes. */ 1068170808Sdelphij if (vp->v_type != VDIR) { 1069170808Sdelphij error = ENOTDIR; 1070170808Sdelphij goto out; 1071170808Sdelphij } 1072170808Sdelphij 1073170808Sdelphij node = VP_TO_TMPFS_DIR(vp); 1074170808Sdelphij 1075170808Sdelphij startoff = uio->uio_offset; 1076170808Sdelphij 1077170808Sdelphij cnt = 0; 1078170808Sdelphij if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1079170808Sdelphij error = tmpfs_dir_getdotdent(node, uio); 1080170808Sdelphij if (error == -1) { 1081170808Sdelphij error = 0; 1082170808Sdelphij goto outok; 1083170808Sdelphij } else if (error != 0) 1084170808Sdelphij goto outok; 1085170808Sdelphij cnt++; 1086170808Sdelphij } 1087170808Sdelphij 1088170808Sdelphij if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1089170808Sdelphij error = tmpfs_dir_getdotdotdent(node, uio); 1090170808Sdelphij if (error == -1) { 1091170808Sdelphij error = 0; 1092170808Sdelphij goto outok; 1093170808Sdelphij } else if (error != 0) 1094170808Sdelphij goto outok; 1095170808Sdelphij cnt++; 1096170808Sdelphij } 1097170808Sdelphij 1098170808Sdelphij error = tmpfs_dir_getdents(node, uio, &cnt); 1099170808Sdelphij if (error == -1) 1100170808Sdelphij error = 0; 1101170808Sdelphij MPASS(error >= 0); 1102170808Sdelphij 1103170808Sdelphijoutok: 1104170808Sdelphij /* This label assumes that startoff has been 1105170808Sdelphij * initialized. If the compiler didn't spit out warnings, we'd 1106170808Sdelphij * simply make this one be 'out' and drop 'outok'. */ 1107170808Sdelphij 1108170808Sdelphij if (eofflag != NULL) 1109170808Sdelphij *eofflag = 1110170808Sdelphij (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1111170808Sdelphij 1112170808Sdelphij /* Update NFS-related variables. */ 1113170808Sdelphij if (error == 0 && cookies != NULL && ncookies != NULL) { 1114170808Sdelphij off_t i; 1115170808Sdelphij off_t off = startoff; 1116170808Sdelphij struct tmpfs_dirent *de = NULL; 1117170808Sdelphij 1118170808Sdelphij *ncookies = cnt; 1119170808Sdelphij *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1120170808Sdelphij 1121170808Sdelphij for (i = 0; i < cnt; i++) { 1122170808Sdelphij MPASS(off != TMPFS_DIRCOOKIE_EOF); 1123170808Sdelphij if (off == TMPFS_DIRCOOKIE_DOT) { 1124170808Sdelphij off = TMPFS_DIRCOOKIE_DOTDOT; 1125170808Sdelphij } else { 1126170808Sdelphij if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1127170808Sdelphij de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1128170808Sdelphij } else if (de != NULL) { 1129170808Sdelphij de = TAILQ_NEXT(de, td_entries); 1130170808Sdelphij } else { 1131170808Sdelphij de = tmpfs_dir_lookupbycookie(node, 1132170808Sdelphij off); 1133170808Sdelphij MPASS(de != NULL); 1134170808Sdelphij de = TAILQ_NEXT(de, td_entries); 1135170808Sdelphij } 1136170808Sdelphij if (de == NULL) { 1137170808Sdelphij off = TMPFS_DIRCOOKIE_EOF; 1138170808Sdelphij } else { 1139170808Sdelphij off = TMPFS_DIRCOOKIE(de); 1140170808Sdelphij } 1141170808Sdelphij } 1142170808Sdelphij 1143170808Sdelphij (*cookies)[i] = off; 1144170808Sdelphij } 1145170808Sdelphij MPASS(uio->uio_offset == off); 1146170808Sdelphij } 1147170808Sdelphij 1148170808Sdelphijout: 1149170808Sdelphij return error; 1150170808Sdelphij} 1151170808Sdelphij 1152170808Sdelphij/* --------------------------------------------------------------------- */ 1153170808Sdelphij 1154171069Sdelphijstatic int 1155170808Sdelphijtmpfs_readlink(struct vop_readlink_args *v) 1156170808Sdelphij{ 1157170808Sdelphij struct vnode *vp = v->a_vp; 1158170808Sdelphij struct uio *uio = v->a_uio; 1159170808Sdelphij 1160170808Sdelphij int error; 1161170808Sdelphij struct tmpfs_node *node; 1162170808Sdelphij 1163170808Sdelphij MPASS(uio->uio_offset == 0); 1164170808Sdelphij MPASS(vp->v_type == VLNK); 1165170808Sdelphij 1166170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 1167170808Sdelphij 1168170808Sdelphij error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1169170808Sdelphij uio); 1170170808Sdelphij node->tn_status |= TMPFS_NODE_ACCESSED; 1171170808Sdelphij 1172170808Sdelphij return error; 1173170808Sdelphij} 1174170808Sdelphij 1175170808Sdelphij/* --------------------------------------------------------------------- */ 1176170808Sdelphij 1177171069Sdelphijstatic int 1178170808Sdelphijtmpfs_inactive(struct vop_inactive_args *v) 1179170808Sdelphij{ 1180170808Sdelphij struct vnode *vp = v->a_vp; 1181170808Sdelphij struct thread *l = v->a_td; 1182170808Sdelphij 1183170808Sdelphij struct tmpfs_node *node; 1184170808Sdelphij 1185170808Sdelphij MPASS(VOP_ISLOCKED(vp, l)); 1186170808Sdelphij 1187170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 1188170808Sdelphij 1189170808Sdelphij if (node->tn_links == 0) 1190170808Sdelphij vrecycle(vp, l); 1191170808Sdelphij 1192170808Sdelphij return 0; 1193170808Sdelphij} 1194170808Sdelphij 1195170808Sdelphij/* --------------------------------------------------------------------- */ 1196170808Sdelphij 1197170808Sdelphijint 1198170808Sdelphijtmpfs_reclaim(struct vop_reclaim_args *v) 1199170808Sdelphij{ 1200170808Sdelphij struct vnode *vp = v->a_vp; 1201170808Sdelphij 1202170808Sdelphij struct tmpfs_mount *tmp; 1203170808Sdelphij struct tmpfs_node *node; 1204170808Sdelphij 1205170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 1206170808Sdelphij tmp = VFS_TO_TMPFS(vp->v_mount); 1207170808Sdelphij 1208170808Sdelphij vnode_destroy_vobject(vp); 1209170808Sdelphij cache_purge(vp); 1210170808Sdelphij tmpfs_free_vp(vp); 1211170808Sdelphij 1212170808Sdelphij /* If the node referenced by this vnode was deleted by the user, 1213170808Sdelphij * we must free its associated data structures (now that the vnode 1214170808Sdelphij * is being reclaimed). */ 1215170808Sdelphij if (node->tn_links == 0) 1216170808Sdelphij tmpfs_free_node(tmp, node); 1217170808Sdelphij 1218170808Sdelphij MPASS(vp->v_data == NULL); 1219170808Sdelphij return 0; 1220170808Sdelphij} 1221170808Sdelphij 1222170808Sdelphij/* --------------------------------------------------------------------- */ 1223170808Sdelphij 1224171069Sdelphijstatic int 1225170808Sdelphijtmpfs_print(struct vop_print_args *v) 1226170808Sdelphij{ 1227170808Sdelphij struct vnode *vp = v->a_vp; 1228170808Sdelphij 1229170808Sdelphij struct tmpfs_node *node; 1230170808Sdelphij 1231170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 1232170808Sdelphij 1233170808Sdelphij printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1234170808Sdelphij node, node->tn_flags, node->tn_links); 1235170808Sdelphij printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1236170808Sdelphij ", status 0x%x\n", 1237170808Sdelphij node->tn_mode, node->tn_uid, node->tn_gid, 1238170808Sdelphij (uintmax_t)node->tn_size, node->tn_status); 1239170808Sdelphij 1240170808Sdelphij if (vp->v_type == VFIFO) 1241170808Sdelphij fifo_printinfo(vp); 1242170808Sdelphij 1243170808Sdelphij printf("\n"); 1244170808Sdelphij 1245170808Sdelphij return 0; 1246170808Sdelphij} 1247170808Sdelphij 1248170808Sdelphij/* --------------------------------------------------------------------- */ 1249170808Sdelphij 1250171069Sdelphijstatic int 1251170808Sdelphijtmpfs_pathconf(struct vop_pathconf_args *v) 1252170808Sdelphij{ 1253170808Sdelphij int name = v->a_name; 1254170808Sdelphij register_t *retval = v->a_retval; 1255170808Sdelphij 1256170808Sdelphij int error; 1257170808Sdelphij 1258170808Sdelphij error = 0; 1259170808Sdelphij 1260170808Sdelphij switch (name) { 1261170808Sdelphij case _PC_LINK_MAX: 1262170808Sdelphij *retval = LINK_MAX; 1263170808Sdelphij break; 1264170808Sdelphij 1265170808Sdelphij case _PC_NAME_MAX: 1266170808Sdelphij *retval = NAME_MAX; 1267170808Sdelphij break; 1268170808Sdelphij 1269170808Sdelphij case _PC_PATH_MAX: 1270170808Sdelphij *retval = PATH_MAX; 1271170808Sdelphij break; 1272170808Sdelphij 1273170808Sdelphij case _PC_PIPE_BUF: 1274170808Sdelphij *retval = PIPE_BUF; 1275170808Sdelphij break; 1276170808Sdelphij 1277170808Sdelphij case _PC_CHOWN_RESTRICTED: 1278170808Sdelphij *retval = 1; 1279170808Sdelphij break; 1280170808Sdelphij 1281170808Sdelphij case _PC_NO_TRUNC: 1282170808Sdelphij *retval = 1; 1283170808Sdelphij break; 1284170808Sdelphij 1285170808Sdelphij case _PC_SYNC_IO: 1286170808Sdelphij *retval = 1; 1287170808Sdelphij break; 1288170808Sdelphij 1289170808Sdelphij case _PC_FILESIZEBITS: 1290170808Sdelphij *retval = 0; /* XXX Don't know which value should I return. */ 1291170808Sdelphij break; 1292170808Sdelphij 1293170808Sdelphij default: 1294170808Sdelphij error = EINVAL; 1295170808Sdelphij } 1296170808Sdelphij 1297170808Sdelphij return error; 1298170808Sdelphij} 1299170808Sdelphij 1300170808Sdelphij/* --------------------------------------------------------------------- */ 1301170808Sdelphij 1302171069Sdelphijstatic int 1303170808Sdelphijtmpfs_advlock(struct vop_advlock_args *v) 1304170808Sdelphij{ 1305170808Sdelphij struct vnode *vp = v->a_vp; 1306170808Sdelphij 1307170808Sdelphij struct tmpfs_node *node; 1308170808Sdelphij 1309170808Sdelphij node = VP_TO_TMPFS_NODE(vp); 1310170808Sdelphij 1311170808Sdelphij return lf_advlock(v, &node->tn_lockf, node->tn_size); 1312170808Sdelphij} 1313170808Sdelphij 1314170808Sdelphij/* --------------------------------------------------------------------- */ 1315170808Sdelphij 1316171069Sdelphijstatic int 1317170808Sdelphijtmpfs_vptofh(struct vop_vptofh_args *ap) 1318170808Sdelphij{ 1319170808Sdelphij struct tmpfs_fid *tfhp; 1320170808Sdelphij struct tmpfs_node *node; 1321170808Sdelphij 1322170808Sdelphij tfhp = (struct tmpfs_fid *)ap->a_fhp; 1323170808Sdelphij node = VP_TO_TMPFS_NODE(ap->a_vp); 1324170808Sdelphij 1325170808Sdelphij tfhp->tf_len = sizeof(struct tmpfs_fid); 1326170808Sdelphij tfhp->tf_id = node->tn_id; 1327170808Sdelphij tfhp->tf_gen = node->tn_gen; 1328170808Sdelphij 1329170808Sdelphij return (0); 1330170808Sdelphij} 1331171069Sdelphij 1332171069Sdelphij/* --------------------------------------------------------------------- */ 1333171069Sdelphij 1334171069Sdelphij/* 1335171069Sdelphij * vnode operations vector used for files stored in a tmpfs file system. 1336171069Sdelphij */ 1337171069Sdelphijstruct vop_vector tmpfs_vnodeop_entries = { 1338171069Sdelphij .vop_default = &default_vnodeops, 1339171069Sdelphij .vop_lookup = vfs_cache_lookup, 1340171069Sdelphij .vop_cachedlookup = tmpfs_lookup, 1341171069Sdelphij .vop_create = tmpfs_create, 1342171069Sdelphij .vop_mknod = tmpfs_mknod, 1343171069Sdelphij .vop_open = tmpfs_open, 1344171069Sdelphij .vop_close = tmpfs_close, 1345171069Sdelphij .vop_access = tmpfs_access, 1346171069Sdelphij .vop_getattr = tmpfs_getattr, 1347171069Sdelphij .vop_setattr = tmpfs_setattr, 1348171069Sdelphij .vop_read = tmpfs_read, 1349171069Sdelphij .vop_write = tmpfs_write, 1350171069Sdelphij .vop_fsync = tmpfs_fsync, 1351171069Sdelphij .vop_remove = tmpfs_remove, 1352171069Sdelphij .vop_link = tmpfs_link, 1353171069Sdelphij .vop_rename = tmpfs_rename, 1354171069Sdelphij .vop_mkdir = tmpfs_mkdir, 1355171069Sdelphij .vop_rmdir = tmpfs_rmdir, 1356171069Sdelphij .vop_symlink = tmpfs_symlink, 1357171069Sdelphij .vop_readdir = tmpfs_readdir, 1358171069Sdelphij .vop_readlink = tmpfs_readlink, 1359171069Sdelphij .vop_inactive = tmpfs_inactive, 1360171069Sdelphij .vop_reclaim = tmpfs_reclaim, 1361171069Sdelphij .vop_print = tmpfs_print, 1362171069Sdelphij .vop_pathconf = tmpfs_pathconf, 1363171069Sdelphij .vop_advlock = tmpfs_advlock, 1364171069Sdelphij .vop_vptofh = tmpfs_vptofh, 1365171069Sdelphij .vop_bmap = VOP_EOPNOTSUPP, 1366171069Sdelphij}; 1367171069Sdelphij 1368