/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int tmp_getapage(struct vnode *, u_offset_t, size_t, uint_t *, page_t **, size_t, struct seg *, caddr_t, enum seg_rw, struct cred *); static int tmp_putapage(struct vnode *, page_t *, u_offset_t *, size_t *, int, struct cred *); /* ARGSUSED1 */ static int tmp_open(struct vnode **vpp, int flag, struct cred *cred, caller_context_t *ct) { /* * swapon to a tmpfs file is not supported so access * is denied on open if VISSWAP is set. */ if ((*vpp)->v_flag & VISSWAP) return (EINVAL); return (0); } /* ARGSUSED1 */ static int tmp_close( struct vnode *vp, int flag, int count, offset_t offset, struct cred *cred, caller_context_t *ct) { cleanlocks(vp, ttoproc(curthread)->p_pid, 0); cleanshares(vp, ttoproc(curthread)->p_pid); return (0); } /* * wrtmp does the real work of write requests for tmpfs. */ static int wrtmp( struct tmount *tm, struct tmpnode *tp, struct uio *uio, struct cred *cr, struct caller_context *ct) { pgcnt_t pageoffset; /* offset in pages */ ulong_t segmap_offset; /* pagesize byte offset into segmap */ caddr_t base; /* base of segmap */ ssize_t bytes; /* bytes to uiomove */ pfn_t pagenumber; /* offset in pages into tmp file */ struct vnode *vp; int error = 0; int pagecreate; /* == 1 if we allocated a page */ int newpage; rlim64_t limit = uio->uio_llimit; long oresid = uio->uio_resid; timestruc_t now; long tn_size_changed = 0; long old_tn_size; long new_tn_size; vp = TNTOV(tp); ASSERT(vp->v_type == VREG); TRACE_1(TR_FAC_TMPFS, TR_TMPFS_RWTMP_START, "tmp_wrtmp_start:vp %p", vp); ASSERT(RW_WRITE_HELD(&tp->tn_contents)); ASSERT(RW_WRITE_HELD(&tp->tn_rwlock)); if (MANDLOCK(vp, tp->tn_mode)) { rw_exit(&tp->tn_contents); /* * tmp_getattr ends up being called by chklock */ error = chklock(vp, FWRITE, uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct); rw_enter(&tp->tn_contents, RW_WRITER); if (error != 0) { TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_wrtmp_end:vp %p error %d", vp, error); return (error); } } if (uio->uio_loffset < 0) return (EINVAL); if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) limit = MAXOFFSET_T; if (uio->uio_loffset >= limit) { proc_t *p = ttoproc(curthread); mutex_enter(&p->p_lock); (void) rctl_action(rctlproc_legacy[RLIMIT_FSIZE], p->p_rctls, p, RCA_UNSAFE_SIGINFO); mutex_exit(&p->p_lock); return (EFBIG); } if (uio->uio_loffset >= MAXOFF_T) { TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_wrtmp_end:vp %p error %d", vp, EINVAL); return (EFBIG); } if (uio->uio_resid == 0) { TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_wrtmp_end:vp %p error %d", vp, 0); return (0); } if (limit > MAXOFF_T) limit = MAXOFF_T; do { long offset; long delta; offset = (long)uio->uio_offset; pageoffset = offset & PAGEOFFSET; /* * A maximum of PAGESIZE bytes of data is transferred * each pass through this loop */ bytes = MIN(PAGESIZE - pageoffset, uio->uio_resid); if (offset + bytes >= limit) { if (offset >= limit) { error = EFBIG; goto out; } bytes = limit - offset; } pagenumber = btop(offset); /* * delta is the amount of anonymous memory * to reserve for the file. * We always reserve in pagesize increments so * unless we're extending the file into a new page, * we don't need to call tmp_resv. */ delta = offset + bytes - P2ROUNDUP_TYPED(tp->tn_size, PAGESIZE, u_offset_t); if (delta > 0) { pagecreate = 1; if (tmp_resv(tm, tp, delta, pagecreate)) { /* * Log file system full in the zone that owns * the tmpfs mount, as well as in the global * zone if necessary. */ zcmn_err(tm->tm_vfsp->vfs_zone->zone_id, CE_WARN, "%s: File system full, " "swap space limit exceeded", tm->tm_mntpath); if (tm->tm_vfsp->vfs_zone->zone_id != GLOBAL_ZONEID) { vfs_t *vfs = tm->tm_vfsp; zcmn_err(GLOBAL_ZONEID, CE_WARN, "%s: File system full, " "swap space limit exceeded", vfs->vfs_vnodecovered->v_path); } error = ENOSPC; break; } tmpnode_growmap(tp, (ulong_t)offset + bytes); } /* grow the file to the new length */ if (offset + bytes > tp->tn_size) { tn_size_changed = 1; old_tn_size = tp->tn_size; /* * Postpone updating tp->tn_size until uiomove() is * done. */ new_tn_size = offset + bytes; } if (bytes == PAGESIZE) { /* * Writing whole page so reading from disk * is a waste */ pagecreate = 1; } else { pagecreate = 0; } /* * If writing past EOF or filling in a hole * we need to allocate an anon slot. */ if (anon_get_ptr(tp->tn_anon, pagenumber) == NULL) { (void) anon_set_ptr(tp->tn_anon, pagenumber, anon_alloc(vp, ptob(pagenumber)), ANON_SLEEP); pagecreate = 1; tp->tn_nblocks++; } /* * We have to drop the contents lock to allow the VM * system to reacquire it in tmp_getpage() */ rw_exit(&tp->tn_contents); newpage = 0; if (vpm_enable) { /* * Copy data. If new pages are created, part of * the page that is not written will be initizliazed * with zeros. */ error = vpm_data_copy(vp, offset, bytes, uio, !pagecreate, &newpage, 1, S_WRITE); } else { /* Get offset within the segmap mapping */ segmap_offset = (offset & PAGEMASK) & MAXBOFFSET; base = segmap_getmapflt(segkmap, vp, (offset & MAXBMASK), PAGESIZE, !pagecreate, S_WRITE); } if (!vpm_enable && pagecreate) { /* * segmap_pagecreate() returns 1 if it calls * page_create_va() to allocate any pages. */ newpage = segmap_pagecreate(segkmap, base + segmap_offset, (size_t)PAGESIZE, 0); /* * Clear from the beginning of the page to the starting * offset of the data. */ if (pageoffset != 0) (void) kzero(base + segmap_offset, (size_t)pageoffset); } if (!vpm_enable) { error = uiomove(base + segmap_offset + pageoffset, (long)bytes, UIO_WRITE, uio); } if (!vpm_enable && pagecreate && uio->uio_offset < P2ROUNDUP(offset + bytes, PAGESIZE)) { long zoffset; /* zero from offset into page */ /* * We created pages w/o initializing them completely, * thus we need to zero the part that wasn't set up. * This happens on most EOF write cases and if * we had some sort of error during the uiomove. */ long nmoved; nmoved = uio->uio_offset - offset; ASSERT((nmoved + pageoffset) <= PAGESIZE); /* * Zero from the end of data in the page to the * end of the page. */ if ((zoffset = pageoffset + nmoved) < PAGESIZE) (void) kzero(base + segmap_offset + zoffset, (size_t)PAGESIZE - zoffset); } /* * Unlock the pages which have been allocated by * page_create_va() in segmap_pagecreate() */ if (!vpm_enable && newpage) { segmap_pageunlock(segkmap, base + segmap_offset, (size_t)PAGESIZE, S_WRITE); } if (error) { /* * If we failed on a write, we must * be sure to invalidate any pages that may have * been allocated. */ if (vpm_enable) { (void) vpm_sync_pages(vp, offset, PAGESIZE, SM_INVAL); } else { (void) segmap_release(segkmap, base, SM_INVAL); } } else { if (vpm_enable) { error = vpm_sync_pages(vp, offset, PAGESIZE, 0); } else { error = segmap_release(segkmap, base, 0); } } /* * Re-acquire contents lock. */ rw_enter(&tp->tn_contents, RW_WRITER); /* * Update tn_size. */ if (tn_size_changed) tp->tn_size = new_tn_size; /* * If the uiomove failed, fix up tn_size. */ if (error) { if (tn_size_changed) { /* * The uiomove failed, and we * allocated blocks,so get rid * of them. */ (void) tmpnode_trunc(tm, tp, (ulong_t)old_tn_size); } } else { /* * XXX - Can this be out of the loop? */ if ((tp->tn_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) && (tp->tn_mode & (S_ISUID | S_ISGID)) && secpolicy_vnode_setid_retain(cr, (tp->tn_mode & S_ISUID) != 0 && tp->tn_uid == 0)) { /* * Clear Set-UID & Set-GID bits on * successful write if not privileged * and at least one of the execute bits * is set. If we always clear Set-GID, * mandatory file and record locking is * unuseable. */ tp->tn_mode &= ~(S_ISUID | S_ISGID); } gethrestime(&now); tp->tn_mtime = now; tp->tn_ctime = now; } } while (error == 0 && uio->uio_resid > 0 && bytes != 0); out: /* * If we've already done a partial-write, terminate * the write but return no error. */ if (oresid != uio->uio_resid) error = 0; TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_wrtmp_end:vp %p error %d", vp, error); return (error); } /* * rdtmp does the real work of read requests for tmpfs. */ static int rdtmp( struct tmount *tm, struct tmpnode *tp, struct uio *uio, struct caller_context *ct) { ulong_t pageoffset; /* offset in tmpfs file (uio_offset) */ ulong_t segmap_offset; /* pagesize byte offset into segmap */ caddr_t base; /* base of segmap */ ssize_t bytes; /* bytes to uiomove */ struct vnode *vp; int error; long oresid = uio->uio_resid; #if defined(lint) tm = tm; #endif vp = TNTOV(tp); TRACE_1(TR_FAC_TMPFS, TR_TMPFS_RWTMP_START, "tmp_rdtmp_start:vp %p", vp); ASSERT(RW_LOCK_HELD(&tp->tn_contents)); if (MANDLOCK(vp, tp->tn_mode)) { rw_exit(&tp->tn_contents); /* * tmp_getattr ends up being called by chklock */ error = chklock(vp, FREAD, uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct); rw_enter(&tp->tn_contents, RW_READER); if (error != 0) { TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_rdtmp_end:vp %p error %d", vp, error); return (error); } } ASSERT(tp->tn_type == VREG); if (uio->uio_loffset >= MAXOFF_T) { TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_rdtmp_end:vp %p error %d", vp, EINVAL); return (0); } if (uio->uio_loffset < 0) return (EINVAL); if (uio->uio_resid == 0) { TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_rdtmp_end:vp %p error %d", vp, 0); return (0); } vp = TNTOV(tp); do { long diff; long offset; offset = uio->uio_offset; pageoffset = offset & PAGEOFFSET; bytes = MIN(PAGESIZE - pageoffset, uio->uio_resid); diff = tp->tn_size - offset; if (diff <= 0) { error = 0; goto out; } if (diff < bytes) bytes = diff; /* * We have to drop the contents lock to allow the VM system * to reacquire it in tmp_getpage() should the uiomove cause a * pagefault. */ rw_exit(&tp->tn_contents); if (vpm_enable) { /* * Copy data. */ error = vpm_data_copy(vp, offset, bytes, uio, 1, NULL, 0, S_READ); } else { segmap_offset = (offset & PAGEMASK) & MAXBOFFSET; base = segmap_getmapflt(segkmap, vp, offset & MAXBMASK, bytes, 1, S_READ); error = uiomove(base + segmap_offset + pageoffset, (long)bytes, UIO_READ, uio); } if (error) { if (vpm_enable) { (void) vpm_sync_pages(vp, offset, PAGESIZE, 0); } else { (void) segmap_release(segkmap, base, 0); } } else { if (vpm_enable) { error = vpm_sync_pages(vp, offset, PAGESIZE, 0); } else { error = segmap_release(segkmap, base, 0); } } /* * Re-acquire contents lock. */ rw_enter(&tp->tn_contents, RW_READER); } while (error == 0 && uio->uio_resid > 0); out: gethrestime(&tp->tn_atime); /* * If we've already done a partial read, terminate * the read but return no error. */ if (oresid != uio->uio_resid) error = 0; TRACE_2(TR_FAC_TMPFS, TR_TMPFS_RWTMP_END, "tmp_rdtmp_end:vp %x error %d", vp, error); return (error); } /* ARGSUSED2 */ static int tmp_read(struct vnode *vp, struct uio *uiop, int ioflag, cred_t *cred, struct caller_context *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); struct tmount *tm = (struct tmount *)VTOTM(vp); int error; /* * We don't currently support reading non-regular files */ if (vp->v_type == VDIR) return (EISDIR); if (vp->v_type != VREG) return (EINVAL); /* * tmp_rwlock should have already been called from layers above */ ASSERT(RW_READ_HELD(&tp->tn_rwlock)); rw_enter(&tp->tn_contents, RW_READER); error = rdtmp(tm, tp, uiop, ct); rw_exit(&tp->tn_contents); return (error); } static int tmp_write(struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cred, struct caller_context *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); struct tmount *tm = (struct tmount *)VTOTM(vp); int error; /* * We don't currently support writing to non-regular files */ if (vp->v_type != VREG) return (EINVAL); /* XXX EISDIR? */ /* * tmp_rwlock should have already been called from layers above */ ASSERT(RW_WRITE_HELD(&tp->tn_rwlock)); rw_enter(&tp->tn_contents, RW_WRITER); if (ioflag & FAPPEND) { /* * In append mode start at end of file. */ uiop->uio_loffset = tp->tn_size; } error = wrtmp(tm, tp, uiop, cred, ct); rw_exit(&tp->tn_contents); return (error); } /* ARGSUSED */ static int tmp_ioctl( struct vnode *vp, int com, intptr_t data, int flag, struct cred *cred, int *rvalp, caller_context_t *ct) { return (ENOTTY); } /* ARGSUSED2 */ static int tmp_getattr( struct vnode *vp, struct vattr *vap, int flags, struct cred *cred, caller_context_t *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); struct vnode *mvp; struct vattr va; int attrs = 1; /* * A special case to handle the root tnode on a diskless nfs * client who may have had its uid and gid inherited * from an nfs vnode with nobody ownership. Likely the * root filesystem. After nfs is fully functional the uid/gid * may be mapable so ask again. * vfsp can't get unmounted because we hold vp. */ if (vp->v_flag & VROOT && (mvp = vp->v_vfsp->vfs_vnodecovered) != NULL) { mutex_enter(&tp->tn_tlock); if (tp->tn_uid == UID_NOBODY || tp->tn_gid == GID_NOBODY) { mutex_exit(&tp->tn_tlock); bzero(&va, sizeof (struct vattr)); va.va_mask = AT_UID|AT_GID; attrs = VOP_GETATTR(mvp, &va, 0, cred, ct); } else { mutex_exit(&tp->tn_tlock); } } mutex_enter(&tp->tn_tlock); if (attrs == 0) { tp->tn_uid = va.va_uid; tp->tn_gid = va.va_gid; } vap->va_type = vp->v_type; vap->va_mode = tp->tn_mode & MODEMASK; vap->va_uid = tp->tn_uid; vap->va_gid = tp->tn_gid; vap->va_fsid = tp->tn_fsid; vap->va_nodeid = (ino64_t)tp->tn_nodeid; vap->va_nlink = tp->tn_nlink; vap->va_size = (u_offset_t)tp->tn_size; vap->va_atime = tp->tn_atime; vap->va_mtime = tp->tn_mtime; vap->va_ctime = tp->tn_ctime; vap->va_blksize = PAGESIZE; vap->va_rdev = tp->tn_rdev; vap->va_seq = tp->tn_seq; /* * XXX Holes are not taken into account. We could take the time to * run through the anon array looking for allocated slots... */ vap->va_nblocks = (fsblkcnt64_t)btodb(ptob(btopr(vap->va_size))); mutex_exit(&tp->tn_tlock); return (0); } /*ARGSUSED4*/ static int tmp_setattr( struct vnode *vp, struct vattr *vap, int flags, struct cred *cred, caller_context_t *ct) { struct tmount *tm = (struct tmount *)VTOTM(vp); struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); int error = 0; struct vattr *get; long mask; /* * Cannot set these attributes */ if ((vap->va_mask & AT_NOSET) || (vap->va_mask & AT_XVATTR)) return (EINVAL); mutex_enter(&tp->tn_tlock); get = &tp->tn_attr; /* * Change file access modes. Must be owner or have sufficient * privileges. */ error = secpolicy_vnode_setattr(cred, vp, vap, get, flags, tmp_taccess, tp); if (error) goto out; mask = vap->va_mask; if (mask & AT_MODE) { get->va_mode &= S_IFMT; get->va_mode |= vap->va_mode & ~S_IFMT; } if (mask & AT_UID) get->va_uid = vap->va_uid; if (mask & AT_GID) get->va_gid = vap->va_gid; if (mask & AT_ATIME) get->va_atime = vap->va_atime; if (mask & AT_MTIME) get->va_mtime = vap->va_mtime; if (mask & (AT_UID | AT_GID | AT_MODE | AT_MTIME)) gethrestime(&tp->tn_ctime); if (mask & AT_SIZE) { ASSERT(vp->v_type != VDIR); /* Don't support large files. */ if (vap->va_size > MAXOFF_T) { error = EFBIG; goto out; } mutex_exit(&tp->tn_tlock); rw_enter(&tp->tn_rwlock, RW_WRITER); rw_enter(&tp->tn_contents, RW_WRITER); error = tmpnode_trunc(tm, tp, (ulong_t)vap->va_size); rw_exit(&tp->tn_contents); rw_exit(&tp->tn_rwlock); goto out1; } out: mutex_exit(&tp->tn_tlock); out1: return (error); } /* ARGSUSED2 */ static int tmp_access( struct vnode *vp, int mode, int flags, struct cred *cred, caller_context_t *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); int error; mutex_enter(&tp->tn_tlock); error = tmp_taccess(tp, mode, cred); mutex_exit(&tp->tn_tlock); return (error); } /* ARGSUSED3 */ static int tmp_lookup( struct vnode *dvp, char *nm, struct vnode **vpp, struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cred, caller_context_t *ct, int *direntflags, pathname_t *realpnp) { struct tmpnode *tp = (struct tmpnode *)VTOTN(dvp); struct tmpnode *ntp = NULL; int error; /* allow cd into @ dir */ if (flags & LOOKUP_XATTR) { struct tmpnode *xdp; struct tmount *tm; /* * don't allow attributes if not mounted XATTR support */ if (!(dvp->v_vfsp->vfs_flag & VFS_XATTR)) return (EINVAL); if (tp->tn_flags & ISXATTR) /* No attributes on attributes */ return (EINVAL); rw_enter(&tp->tn_rwlock, RW_WRITER); if (tp->tn_xattrdp == NULL) { if (!(flags & CREATE_XATTR_DIR)) { rw_exit(&tp->tn_rwlock); return (ENOENT); } /* * No attribute directory exists for this * node - create the attr dir as a side effect * of this lookup. */ /* * Make sure we have adequate permission... */ if ((error = tmp_taccess(tp, VWRITE, cred)) != 0) { rw_exit(&tp->tn_rwlock); return (error); } xdp = tmp_memalloc(sizeof (struct tmpnode), TMP_MUSTHAVE); tm = VTOTM(dvp); tmpnode_init(tm, xdp, &tp->tn_attr, NULL); /* * Fix-up fields unique to attribute directories. */ xdp->tn_flags = ISXATTR; xdp->tn_type = VDIR; if (tp->tn_type == VDIR) { xdp->tn_mode = tp->tn_attr.va_mode; } else { xdp->tn_mode = 0700; if (tp->tn_attr.va_mode & 0040) xdp->tn_mode |= 0750; if (tp->tn_attr.va_mode & 0004) xdp->tn_mode |= 0705; } xdp->tn_vnode->v_type = VDIR; xdp->tn_vnode->v_flag |= V_XATTRDIR; tdirinit(tp, xdp); tp->tn_xattrdp = xdp; } else { VN_HOLD(tp->tn_xattrdp->tn_vnode); } *vpp = TNTOV(tp->tn_xattrdp); rw_exit(&tp->tn_rwlock); return (0); } /* * Null component name is a synonym for directory being searched. */ if (*nm == '\0') { VN_HOLD(dvp); *vpp = dvp; return (0); } ASSERT(tp); error = tdirlookup(tp, nm, &ntp, cred); if (error == 0) { ASSERT(ntp); *vpp = TNTOV(ntp); /* * If vnode is a device return special vnode instead */ if (IS_DEVVP(*vpp)) { struct vnode *newvp; newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cred); VN_RELE(*vpp); *vpp = newvp; } } TRACE_4(TR_FAC_TMPFS, TR_TMPFS_LOOKUP, "tmpfs lookup:vp %p name %s vpp %p error %d", dvp, nm, vpp, error); return (error); } /*ARGSUSED7*/ static int tmp_create( struct vnode *dvp, char *nm, struct vattr *vap, enum vcexcl exclusive, int mode, struct vnode **vpp, struct cred *cred, int flag, caller_context_t *ct, vsecattr_t *vsecp) { struct tmpnode *parent; struct tmount *tm; struct tmpnode *self; int error; struct tmpnode *oldtp; again: parent = (struct tmpnode *)VTOTN(dvp); tm = (struct tmount *)VTOTM(dvp); self = NULL; error = 0; oldtp = NULL; /* device files not allowed in ext. attr dirs */ if ((parent->tn_flags & ISXATTR) && (vap->va_type == VBLK || vap->va_type == VCHR || vap->va_type == VFIFO || vap->va_type == VDOOR || vap->va_type == VSOCK || vap->va_type == VPORT)) return (EINVAL); if (vap->va_type == VREG && (vap->va_mode & VSVTX)) { /* Must be privileged to set sticky bit */ if (secpolicy_vnode_stky_modify(cred)) vap->va_mode &= ~VSVTX; } else if (vap->va_type == VNON) { return (EINVAL); } /* * Null component name is a synonym for directory being searched. */ if (*nm == '\0') { VN_HOLD(dvp); oldtp = parent; } else { error = tdirlookup(parent, nm, &oldtp, cred); } if (error == 0) { /* name found */ ASSERT(oldtp); rw_enter(&oldtp->tn_rwlock, RW_WRITER); /* * if create/read-only an existing * directory, allow it */ if (exclusive == EXCL) error = EEXIST; else if ((oldtp->tn_type == VDIR) && (mode & VWRITE)) error = EISDIR; else { error = tmp_taccess(oldtp, mode, cred); } if (error) { rw_exit(&oldtp->tn_rwlock); tmpnode_rele(oldtp); return (error); } *vpp = TNTOV(oldtp); if ((*vpp)->v_type == VREG && (vap->va_mask & AT_SIZE) && vap->va_size == 0) { rw_enter(&oldtp->tn_contents, RW_WRITER); (void) tmpnode_trunc(tm, oldtp, 0); rw_exit(&oldtp->tn_contents); } rw_exit(&oldtp->tn_rwlock); if (IS_DEVVP(*vpp)) { struct vnode *newvp; newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cred); VN_RELE(*vpp); if (newvp == NULL) { return (ENOSYS); } *vpp = newvp; } if (error == 0) { vnevent_create(*vpp, ct); } return (0); } if (error != ENOENT) return (error); rw_enter(&parent->tn_rwlock, RW_WRITER); error = tdirenter(tm, parent, nm, DE_CREATE, (struct tmpnode *)NULL, (struct tmpnode *)NULL, vap, &self, cred, ct); rw_exit(&parent->tn_rwlock); if (error) { if (self) tmpnode_rele(self); if (error == EEXIST) { /* * This means that the file was created sometime * after we checked and did not find it and when * we went to create it. * Since creat() is supposed to truncate a file * that already exits go back to the begining * of the function. This time we will find it * and go down the tmp_trunc() path */ goto again; } return (error); } *vpp = TNTOV(self); if (!error && IS_DEVVP(*vpp)) { struct vnode *newvp; newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cred); VN_RELE(*vpp); if (newvp == NULL) return (ENOSYS); *vpp = newvp; } TRACE_3(TR_FAC_TMPFS, TR_TMPFS_CREATE, "tmpfs create:dvp %p nm %s vpp %p", dvp, nm, vpp); return (0); } /* ARGSUSED3 */ static int tmp_remove( struct vnode *dvp, char *nm, struct cred *cred, caller_context_t *ct, int flags) { struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp); int error; struct tmpnode *tp = NULL; error = tdirlookup(parent, nm, &tp, cred); if (error) return (error); ASSERT(tp); rw_enter(&parent->tn_rwlock, RW_WRITER); rw_enter(&tp->tn_rwlock, RW_WRITER); if (tp->tn_type != VDIR || (error = secpolicy_fs_linkdir(cred, dvp->v_vfsp)) == 0) error = tdirdelete(parent, tp, nm, DR_REMOVE, cred); rw_exit(&tp->tn_rwlock); rw_exit(&parent->tn_rwlock); vnevent_remove(TNTOV(tp), dvp, nm, ct); tmpnode_rele(tp); TRACE_3(TR_FAC_TMPFS, TR_TMPFS_REMOVE, "tmpfs remove:dvp %p nm %s error %d", dvp, nm, error); return (error); } /* ARGSUSED4 */ static int tmp_link( struct vnode *dvp, struct vnode *srcvp, char *tnm, struct cred *cred, caller_context_t *ct, int flags) { struct tmpnode *parent; struct tmpnode *from; struct tmount *tm = (struct tmount *)VTOTM(dvp); int error; struct tmpnode *found = NULL; struct vnode *realvp; if (VOP_REALVP(srcvp, &realvp, ct) == 0) srcvp = realvp; parent = (struct tmpnode *)VTOTN(dvp); from = (struct tmpnode *)VTOTN(srcvp); if ((srcvp->v_type == VDIR && secpolicy_fs_linkdir(cred, dvp->v_vfsp)) || (from->tn_uid != crgetuid(cred) && secpolicy_basic_link(cred))) return (EPERM); /* * Make sure link for extended attributes is valid * We only support hard linking of xattr's in xattrdir to an xattrdir */ if ((from->tn_flags & ISXATTR) != (parent->tn_flags & ISXATTR)) return (EINVAL); error = tdirlookup(parent, tnm, &found, cred); if (error == 0) { ASSERT(found); tmpnode_rele(found); return (EEXIST); } if (error != ENOENT) return (error); rw_enter(&parent->tn_rwlock, RW_WRITER); error = tdirenter(tm, parent, tnm, DE_LINK, (struct tmpnode *)NULL, from, NULL, (struct tmpnode **)NULL, cred, ct); rw_exit(&parent->tn_rwlock); if (error == 0) { vnevent_link(srcvp, ct); } return (error); } /* ARGSUSED5 */ static int tmp_rename( struct vnode *odvp, /* source parent vnode */ char *onm, /* source name */ struct vnode *ndvp, /* destination parent vnode */ char *nnm, /* destination name */ struct cred *cred, caller_context_t *ct, int flags) { struct tmpnode *fromparent; struct tmpnode *toparent; struct tmpnode *fromtp = NULL; /* source tmpnode */ struct tmount *tm = (struct tmount *)VTOTM(odvp); int error; int samedir = 0; /* set if odvp == ndvp */ struct vnode *realvp; if (VOP_REALVP(ndvp, &realvp, ct) == 0) ndvp = realvp; fromparent = (struct tmpnode *)VTOTN(odvp); toparent = (struct tmpnode *)VTOTN(ndvp); if ((fromparent->tn_flags & ISXATTR) != (toparent->tn_flags & ISXATTR)) return (EINVAL); mutex_enter(&tm->tm_renamelck); /* * Look up tmpnode of file we're supposed to rename. */ error = tdirlookup(fromparent, onm, &fromtp, cred); if (error) { mutex_exit(&tm->tm_renamelck); return (error); } /* * Make sure we can delete the old (source) entry. This * requires write permission on the containing directory. If * that directory is "sticky" it requires further checks. */ if (((error = tmp_taccess(fromparent, VWRITE, cred)) != 0) || (error = tmp_sticky_remove_access(fromparent, fromtp, cred)) != 0) goto done; /* * Check for renaming to or from '.' or '..' or that * fromtp == fromparent */ if ((onm[0] == '.' && (onm[1] == '\0' || (onm[1] == '.' && onm[2] == '\0'))) || (nnm[0] == '.' && (nnm[1] == '\0' || (nnm[1] == '.' && nnm[2] == '\0'))) || (fromparent == fromtp)) { error = EINVAL; goto done; } samedir = (fromparent == toparent); /* * Make sure we can search and rename into the new * (destination) directory. */ if (!samedir) { error = tmp_taccess(toparent, VEXEC|VWRITE, cred); if (error) goto done; } /* * Link source to new target */ rw_enter(&toparent->tn_rwlock, RW_WRITER); error = tdirenter(tm, toparent, nnm, DE_RENAME, fromparent, fromtp, (struct vattr *)NULL, (struct tmpnode **)NULL, cred, ct); rw_exit(&toparent->tn_rwlock); if (error) { /* * ESAME isn't really an error; it indicates that the * operation should not be done because the source and target * are the same file, but that no error should be reported. */ if (error == ESAME) error = 0; goto done; } vnevent_rename_src(TNTOV(fromtp), odvp, onm, ct); /* * Notify the target directory if not same as * source directory. */ if (ndvp != odvp) { vnevent_rename_dest_dir(ndvp, ct); } /* * Unlink from source. */ rw_enter(&fromparent->tn_rwlock, RW_WRITER); rw_enter(&fromtp->tn_rwlock, RW_WRITER); error = tdirdelete(fromparent, fromtp, onm, DR_RENAME, cred); /* * The following handles the case where our source tmpnode was * removed before we got to it. * * XXX We should also cleanup properly in the case where tdirdelete * fails for some other reason. Currently this case shouldn't happen. * (see 1184991). */ if (error == ENOENT) error = 0; rw_exit(&fromtp->tn_rwlock); rw_exit(&fromparent->tn_rwlock); done: tmpnode_rele(fromtp); mutex_exit(&tm->tm_renamelck); TRACE_5(TR_FAC_TMPFS, TR_TMPFS_RENAME, "tmpfs rename:ovp %p onm %s nvp %p nnm %s error %d", odvp, onm, ndvp, nnm, error); return (error); } /* ARGSUSED5 */ static int tmp_mkdir( struct vnode *dvp, char *nm, struct vattr *va, struct vnode **vpp, struct cred *cred, caller_context_t *ct, int flags, vsecattr_t *vsecp) { struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp); struct tmpnode *self = NULL; struct tmount *tm = (struct tmount *)VTOTM(dvp); int error; /* no new dirs allowed in xattr dirs */ if (parent->tn_flags & ISXATTR) return (EINVAL); /* * Might be dangling directory. Catch it here, * because a ENOENT return from tdirlookup() is * an "o.k. return". */ if (parent->tn_nlink == 0) return (ENOENT); error = tdirlookup(parent, nm, &self, cred); if (error == 0) { ASSERT(self); tmpnode_rele(self); return (EEXIST); } if (error != ENOENT) return (error); rw_enter(&parent->tn_rwlock, RW_WRITER); error = tdirenter(tm, parent, nm, DE_MKDIR, (struct tmpnode *)NULL, (struct tmpnode *)NULL, va, &self, cred, ct); if (error) { rw_exit(&parent->tn_rwlock); if (self) tmpnode_rele(self); return (error); } rw_exit(&parent->tn_rwlock); *vpp = TNTOV(self); return (0); } /* ARGSUSED4 */ static int tmp_rmdir( struct vnode *dvp, char *nm, struct vnode *cdir, struct cred *cred, caller_context_t *ct, int flags) { struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp); struct tmpnode *self = NULL; struct vnode *vp; int error = 0; /* * Return error when removing . and .. */ if (strcmp(nm, ".") == 0) return (EINVAL); if (strcmp(nm, "..") == 0) return (EEXIST); /* Should be ENOTEMPTY */ error = tdirlookup(parent, nm, &self, cred); if (error) return (error); rw_enter(&parent->tn_rwlock, RW_WRITER); rw_enter(&self->tn_rwlock, RW_WRITER); vp = TNTOV(self); if (vp == dvp || vp == cdir) { error = EINVAL; goto done1; } if (self->tn_type != VDIR) { error = ENOTDIR; goto done1; } mutex_enter(&self->tn_tlock); if (self->tn_nlink > 2) { mutex_exit(&self->tn_tlock); error = EEXIST; goto done1; } mutex_exit(&self->tn_tlock); if (vn_vfswlock(vp)) { error = EBUSY; goto done1; } if (vn_mountedvfs(vp) != NULL) { error = EBUSY; goto done; } /* * Check for an empty directory * i.e. only includes entries for "." and ".." */ if (self->tn_dirents > 2) { error = EEXIST; /* SIGH should be ENOTEMPTY */ /* * Update atime because checking tn_dirents is logically * equivalent to reading the directory */ gethrestime(&self->tn_atime); goto done; } error = tdirdelete(parent, self, nm, DR_RMDIR, cred); done: vn_vfsunlock(vp); done1: rw_exit(&self->tn_rwlock); rw_exit(&parent->tn_rwlock); vnevent_rmdir(TNTOV(self), dvp, nm, ct); tmpnode_rele(self); return (error); } /* ARGSUSED2 */ static int tmp_readdir( struct vnode *vp, struct uio *uiop, struct cred *cred, int *eofp, caller_context_t *ct, int flags) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); struct tdirent *tdp; int error = 0; size_t namelen; struct dirent64 *dp; ulong_t offset; ulong_t total_bytes_wanted; long outcount = 0; long bufsize; int reclen; caddr_t outbuf; if (uiop->uio_loffset >= MAXOFF_T) { if (eofp) *eofp = 1; return (0); } /* * assuming system call has already called tmp_rwlock */ ASSERT(RW_READ_HELD(&tp->tn_rwlock)); if (uiop->uio_iovcnt != 1) return (EINVAL); if (vp->v_type != VDIR) return (ENOTDIR); /* * There's a window here where someone could have removed * all the entries in the directory after we put a hold on the * vnode but before we grabbed the rwlock. Just return. */ if (tp->tn_dir == NULL) { if (tp->tn_nlink) { panic("empty directory 0x%p", (void *)tp); /*NOTREACHED*/ } return (0); } /* * Get space for multiple directory entries */ total_bytes_wanted = uiop->uio_iov->iov_len; bufsize = total_bytes_wanted + sizeof (struct dirent64); outbuf = kmem_alloc(bufsize, KM_SLEEP); dp = (struct dirent64 *)outbuf; offset = 0; tdp = tp->tn_dir; while (tdp) { namelen = strlen(tdp->td_name); /* no +1 needed */ offset = tdp->td_offset; if (offset >= uiop->uio_offset) { reclen = (int)DIRENT64_RECLEN(namelen); if (outcount + reclen > total_bytes_wanted) { if (!outcount) /* * Buffer too small for any entries. */ error = EINVAL; break; } ASSERT(tdp->td_tmpnode != NULL); /* use strncpy(9f) to zero out uninitialized bytes */ (void) strncpy(dp->d_name, tdp->td_name, DIRENT64_NAMELEN(reclen)); dp->d_reclen = (ushort_t)reclen; dp->d_ino = (ino64_t)tdp->td_tmpnode->tn_nodeid; dp->d_off = (offset_t)tdp->td_offset + 1; dp = (struct dirent64 *) ((uintptr_t)dp + dp->d_reclen); outcount += reclen; ASSERT(outcount <= bufsize); } tdp = tdp->td_next; } if (!error) error = uiomove(outbuf, outcount, UIO_READ, uiop); if (!error) { /* If we reached the end of the list our offset */ /* should now be just past the end. */ if (!tdp) { offset += 1; if (eofp) *eofp = 1; } else if (eofp) *eofp = 0; uiop->uio_offset = offset; } gethrestime(&tp->tn_atime); kmem_free(outbuf, bufsize); return (error); } /* ARGSUSED5 */ static int tmp_symlink( struct vnode *dvp, char *lnm, struct vattr *tva, char *tnm, struct cred *cred, caller_context_t *ct, int flags) { struct tmpnode *parent = (struct tmpnode *)VTOTN(dvp); struct tmpnode *self = (struct tmpnode *)NULL; struct tmount *tm = (struct tmount *)VTOTM(dvp); char *cp = NULL; int error; size_t len; /* no symlinks allowed to files in xattr dirs */ if (parent->tn_flags & ISXATTR) return (EINVAL); error = tdirlookup(parent, lnm, &self, cred); if (error == 0) { /* * The entry already exists */ tmpnode_rele(self); return (EEXIST); /* was 0 */ } if (error != ENOENT) { if (self != NULL) tmpnode_rele(self); return (error); } rw_enter(&parent->tn_rwlock, RW_WRITER); error = tdirenter(tm, parent, lnm, DE_CREATE, (struct tmpnode *)NULL, (struct tmpnode *)NULL, tva, &self, cred, ct); rw_exit(&parent->tn_rwlock); if (error) { if (self) tmpnode_rele(self); return (error); } len = strlen(tnm) + 1; cp = tmp_memalloc(len, 0); if (cp == NULL) { tmpnode_rele(self); return (ENOSPC); } (void) strcpy(cp, tnm); self->tn_symlink = cp; self->tn_size = len - 1; tmpnode_rele(self); return (error); } /* ARGSUSED2 */ static int tmp_readlink( struct vnode *vp, struct uio *uiop, struct cred *cred, caller_context_t *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); int error = 0; if (vp->v_type != VLNK) return (EINVAL); rw_enter(&tp->tn_rwlock, RW_READER); rw_enter(&tp->tn_contents, RW_READER); error = uiomove(tp->tn_symlink, tp->tn_size, UIO_READ, uiop); gethrestime(&tp->tn_atime); rw_exit(&tp->tn_contents); rw_exit(&tp->tn_rwlock); return (error); } /* ARGSUSED */ static int tmp_fsync( struct vnode *vp, int syncflag, struct cred *cred, caller_context_t *ct) { return (0); } /* ARGSUSED */ static void tmp_inactive(struct vnode *vp, struct cred *cred, caller_context_t *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); struct tmount *tm = (struct tmount *)VFSTOTM(vp->v_vfsp); rw_enter(&tp->tn_rwlock, RW_WRITER); top: mutex_enter(&tp->tn_tlock); mutex_enter(&vp->v_lock); ASSERT(vp->v_count >= 1); /* * If we don't have the last hold or the link count is non-zero, * there's little to do -- just drop our hold. */ if (vp->v_count > 1 || tp->tn_nlink != 0) { vp->v_count--; mutex_exit(&vp->v_lock); mutex_exit(&tp->tn_tlock); rw_exit(&tp->tn_rwlock); return; } /* * We have the last hold *and* the link count is zero, so this * tmpnode is dead from the filesystem's viewpoint. However, * if the tmpnode has any pages associated with it (i.e. if it's * a normal file with non-zero size), the tmpnode can still be * discovered by pageout or fsflush via the page vnode pointers. * In this case we must drop all our locks, truncate the tmpnode, * and try the whole dance again. */ if (tp->tn_size != 0) { if (tp->tn_type == VREG) { mutex_exit(&vp->v_lock); mutex_exit(&tp->tn_tlock); rw_enter(&tp->tn_contents, RW_WRITER); (void) tmpnode_trunc(tm, tp, 0); rw_exit(&tp->tn_contents); ASSERT(tp->tn_size == 0); ASSERT(tp->tn_nblocks == 0); goto top; } if (tp->tn_type == VLNK) tmp_memfree(tp->tn_symlink, tp->tn_size + 1); } /* * Remove normal file/dir's xattr dir and xattrs. */ if (tp->tn_xattrdp) { struct tmpnode *xtp = tp->tn_xattrdp; ASSERT(xtp->tn_flags & ISXATTR); tmpnode_hold(xtp); rw_enter(&xtp->tn_rwlock, RW_WRITER); tdirtrunc(xtp); DECR_COUNT(&xtp->tn_nlink, &xtp->tn_tlock); tp->tn_xattrdp = NULL; rw_exit(&xtp->tn_rwlock); tmpnode_rele(xtp); } mutex_exit(&vp->v_lock); mutex_exit(&tp->tn_tlock); /* Here's our chance to send invalid event while we're between locks */ vn_invalid(TNTOV(tp)); mutex_enter(&tm->tm_contents); if (tp->tn_forw == NULL) tm->tm_rootnode->tn_back = tp->tn_back; else tp->tn_forw->tn_back = tp->tn_back; tp->tn_back->tn_forw = tp->tn_forw; mutex_exit(&tm->tm_contents); rw_exit(&tp->tn_rwlock); rw_destroy(&tp->tn_rwlock); mutex_destroy(&tp->tn_tlock); vn_free(TNTOV(tp)); tmp_memfree(tp, sizeof (struct tmpnode)); } /* ARGSUSED2 */ static int tmp_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ct) { struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); struct tfid *tfid; if (fidp->fid_len < (sizeof (struct tfid) - sizeof (ushort_t))) { fidp->fid_len = sizeof (struct tfid) - sizeof (ushort_t); return (ENOSPC); } tfid = (struct tfid *)fidp; bzero(tfid, sizeof (struct tfid)); tfid->tfid_len = (int)sizeof (struct tfid) - sizeof (ushort_t); tfid->tfid_ino = tp->tn_nodeid; tfid->tfid_gen = tp->tn_gen; return (0); } /* * Return all the pages from [off..off+len] in given file */ /* ARGSUSED */ static int tmp_getpage( struct vnode *vp, offset_t off, size_t len, uint_t *protp, page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr, caller_context_t *ct) { int err = 0; struct tmpnode *tp = VTOTN(vp); anoff_t toff = (anoff_t)off; size_t tlen = len; u_offset_t tmpoff; timestruc_t now; rw_enter(&tp->tn_contents, RW_READER); if (off + len > tp->tn_size + PAGEOFFSET) { err = EFAULT; goto out; } /* * Look for holes (no anon slot) in faulting range. If there are * holes we have to switch to a write lock and fill them in. Swap * space for holes was already reserved when the file was grown. */ tmpoff = toff; if (non_anon(tp->tn_anon, btop(off), &tmpoff, &tlen)) { if (!rw_tryupgrade(&tp->tn_contents)) { rw_exit(&tp->tn_contents); rw_enter(&tp->tn_contents, RW_WRITER); /* Size may have changed when lock was dropped */ if (off + len > tp->tn_size + PAGEOFFSET) { err = EFAULT; goto out; } } for (toff = (anoff_t)off; toff < (anoff_t)off + len; toff += PAGESIZE) { if (anon_get_ptr(tp->tn_anon, btop(toff)) == NULL) { /* XXX - may allocate mem w. write lock held */ (void) anon_set_ptr(tp->tn_anon, btop(toff), anon_alloc(vp, toff), ANON_SLEEP); tp->tn_nblocks++; } } rw_downgrade(&tp->tn_contents); } if (len <= PAGESIZE) err = tmp_getapage(vp, (u_offset_t)off, len, protp, pl, plsz, seg, addr, rw, cr); else err = pvn_getpages(tmp_getapage, vp, (u_offset_t)off, len, protp, pl, plsz, seg, addr, rw, cr); gethrestime(&now); tp->tn_atime = now; if (rw == S_WRITE) tp->tn_mtime = now; out: rw_exit(&tp->tn_contents); return (err); } /* * Called from pvn_getpages or swap_getpage to get a particular page. */ /*ARGSUSED*/ static int tmp_getapage( struct vnode *vp, u_offset_t off, size_t len, uint_t *protp, page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr) { struct page *pp; int flags; int err = 0; struct vnode *pvp; u_offset_t poff; if (protp != NULL) *protp = PROT_ALL; again: if (pp = page_lookup(vp, off, rw == S_CREATE ? SE_EXCL : SE_SHARED)) { if (pl) { pl[0] = pp; pl[1] = NULL; } else { page_unlock(pp); } } else { pp = page_create_va(vp, off, PAGESIZE, PG_WAIT | PG_EXCL, seg, addr); /* * Someone raced in and created the page after we did the * lookup but before we did the create, so go back and * try to look it up again. */ if (pp == NULL) goto again; /* * Fill page from backing store, if any. If none, then * either this is a newly filled hole or page must have * been unmodified and freed so just zero it out. */ err = swap_getphysname(vp, off, &pvp, &poff); if (err) { panic("tmp_getapage: no anon slot vp %p " "off %llx pp %p\n", (void *)vp, off, (void *)pp); } if (pvp) { flags = (pl == NULL ? B_ASYNC|B_READ : B_READ); err = VOP_PAGEIO(pvp, pp, (u_offset_t)poff, PAGESIZE, flags, cr, NULL); if (flags & B_ASYNC) pp = NULL; } else if (rw != S_CREATE) { pagezero(pp, 0, PAGESIZE); } if (err && pp) pvn_read_done(pp, B_ERROR); if (err == 0) { if (pl) pvn_plist_init(pp, pl, plsz, off, PAGESIZE, rw); else pvn_io_done(pp); } } return (err); } /* * Flags are composed of {B_INVAL, B_DIRTY B_FREE, B_DONTNEED}. * If len == 0, do from off to EOF. */ static int tmp_nopage = 0; /* Don't do tmp_putpage's if set */ /* ARGSUSED */ int tmp_putpage( register struct vnode *vp, offset_t off, size_t len, int flags, struct cred *cr, caller_context_t *ct) { register page_t *pp; u_offset_t io_off; size_t io_len = 0; int err = 0; struct tmpnode *tp = VTOTN(vp); int dolock; if (tmp_nopage) return (0); ASSERT(vp->v_count != 0); if (vp->v_flag & VNOMAP) return (ENOSYS); /* * This being tmpfs, we don't ever do i/o unless we really * have to (when we're low on memory and pageout calls us * with B_ASYNC | B_FREE or the user explicitly asks for it with * B_DONTNEED). * XXX to approximately track the mod time like ufs we should * update the times here. The problem is, once someone does a * store we never clear the mod bit and do i/o, thus fsflush * will keep calling us every 30 seconds to do the i/o and we'll * continually update the mod time. At least we update the mod * time on the first store because this results in a call to getpage. */ if (flags != (B_ASYNC | B_FREE) && (flags & B_INVAL) == 0 && (flags & B_DONTNEED) == 0) return (0); /* * If this thread owns the lock, i.e., this thread grabbed it * as writer somewhere above, then we don't need to grab the * lock as reader in this routine. */ dolock = (rw_owner(&tp->tn_contents) != curthread); /* * If this is pageout don't block on the lock as you could deadlock * when freemem == 0 (another thread has the read lock and is blocked * creating a page, and a third thread is waiting to get the writers * lock - waiting writers priority blocks us from getting the read * lock). Of course, if the only freeable pages are on this tmpnode * we're hosed anyways. A better solution might be a new lock type. * Note: ufs has the same problem. */ if (curproc == proc_pageout) { if (!rw_tryenter(&tp->tn_contents, RW_READER)) return (ENOMEM); } else if (dolock) rw_enter(&tp->tn_contents, RW_READER); if (!vn_has_cached_data(vp)) goto out; if (len == 0) { if (curproc == proc_pageout) { panic("tmp: pageout can't block"); /*NOTREACHED*/ } /* Search the entire vp list for pages >= off. */ err = pvn_vplist_dirty(vp, (u_offset_t)off, tmp_putapage, flags, cr); } else { u_offset_t eoff; /* * Loop over all offsets in the range [off...off + len] * looking for pages to deal with. */ eoff = MIN(off + len, tp->tn_size); for (io_off = off; io_off < eoff; io_off += io_len) { /* * If we are not invalidating, synchronously * freeing or writing pages use the routine * page_lookup_nowait() to prevent reclaiming * them from the free list. */ if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { pp = page_lookup(vp, io_off, (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED); } else { pp = page_lookup_nowait(vp, io_off, (flags & B_FREE) ? SE_EXCL : SE_SHARED); } if (pp == NULL || pvn_getdirty(pp, flags) == 0) io_len = PAGESIZE; else { err = tmp_putapage(vp, pp, &io_off, &io_len, flags, cr); if (err != 0) break; } } } /* If invalidating, verify all pages on vnode list are gone. */ if (err == 0 && off == 0 && len == 0 && (flags & B_INVAL) && vn_has_cached_data(vp)) { panic("tmp_putpage: B_INVAL, pages not gone"); /*NOTREACHED*/ } out: if ((curproc == proc_pageout) || dolock) rw_exit(&tp->tn_contents); /* * Only reason putapage is going to give us SE_NOSWAP as error * is when we ask a page to be written to physical backing store * and there is none. Ignore this because we might be dealing * with a swap page which does not have any backing store * on disk. In any other case we won't get this error over here. */ if (err == SE_NOSWAP) err = 0; return (err); } long tmp_putpagecnt, tmp_pagespushed; /* * Write out a single page. * For tmpfs this means choose a physical swap slot and write the page * out using VOP_PAGEIO. For performance, we attempt to kluster; i.e., * we try to find a bunch of other dirty pages adjacent in the file * and a bunch of contiguous swap slots, and then write all the pages * out in a single i/o. */ /*ARGSUSED*/ static int tmp_putapage( struct vnode *vp, page_t *pp, u_offset_t *offp, size_t *lenp, int flags, struct cred *cr) { int err; ulong_t klstart, kllen; page_t *pplist, *npplist; extern int klustsize; long tmp_klustsize; struct tmpnode *tp; size_t pp_off, pp_len; u_offset_t io_off; size_t io_len; struct vnode *pvp; u_offset_t pstart; u_offset_t offset; u_offset_t tmpoff; ASSERT(PAGE_LOCKED(pp)); /* Kluster in tmp_klustsize chunks */ tp = VTOTN(vp); tmp_klustsize = klustsize; offset = pp->p_offset; klstart = (offset / tmp_klustsize) * tmp_klustsize; kllen = MIN(tmp_klustsize, tp->tn_size - klstart); /* Get a kluster of pages */ pplist = pvn_write_kluster(vp, pp, &tmpoff, &pp_len, klstart, kllen, flags); pp_off = (size_t)tmpoff; /* * Get a cluster of physical offsets for the pages; the amount we * get may be some subrange of what we ask for (io_off, io_len). */ io_off = pp_off; io_len = pp_len; err = swap_newphysname(vp, offset, &io_off, &io_len, &pvp, &pstart); ASSERT(err != SE_NOANON); /* anon slot must have been filled */ if (err) { pvn_write_done(pplist, B_ERROR | B_WRITE | flags); /* * If this routine is called as a result of segvn_sync * operation and we have no physical swap then we can get an * error here. In such case we would return SE_NOSWAP as error. * At this point, we expect only SE_NOSWAP. */ ASSERT(err == SE_NOSWAP); if (flags & B_INVAL) err = ENOMEM; goto out; } ASSERT(pp_off <= io_off && io_off + io_len <= pp_off + pp_len); ASSERT(io_off <= offset && offset < io_off + io_len); /* Toss pages at front/rear that we couldn't get physical backing for */ if (io_off != pp_off) { npplist = NULL; page_list_break(&pplist, &npplist, btop(io_off - pp_off)); ASSERT(pplist->p_offset == pp_off); ASSERT(pplist->p_prev->p_offset == io_off - PAGESIZE); pvn_write_done(pplist, B_ERROR | B_WRITE | flags); pplist = npplist; } if (io_off + io_len < pp_off + pp_len) { npplist = NULL; page_list_break(&pplist, &npplist, btop(io_len)); ASSERT(npplist->p_offset == io_off + io_len); ASSERT(npplist->p_prev->p_offset == pp_off + pp_len - PAGESIZE); pvn_write_done(npplist, B_ERROR | B_WRITE | flags); } ASSERT(pplist->p_offset == io_off); ASSERT(pplist->p_prev->p_offset == io_off + io_len - PAGESIZE); ASSERT(btopr(io_len) <= btopr(kllen)); /* Do i/o on the remaining kluster */ err = VOP_PAGEIO(pvp, pplist, (u_offset_t)pstart, io_len, B_WRITE | flags, cr, NULL); if ((flags & B_ASYNC) == 0) { pvn_write_done(pplist, ((err) ? B_ERROR : 0) | B_WRITE | flags); } out: if (!err) { if (offp) *offp = io_off; if (lenp) *lenp = io_len; tmp_putpagecnt++; tmp_pagespushed += btop(io_len); } if (err && err != ENOMEM && err != SE_NOSWAP) cmn_err(CE_WARN, "tmp_putapage: err %d\n", err); return (err); } /* ARGSUSED */ static int tmp_map( struct vnode *vp, offset_t off, struct as *as, caddr_t *addrp, size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, struct cred *cred, caller_context_t *ct) { struct segvn_crargs vn_a; struct tmpnode *tp = (struct tmpnode *)VTOTN(vp); int error; #ifdef _ILP32 if (len > MAXOFF_T) return (ENOMEM); #endif if (vp->v_flag & VNOMAP) return (ENOSYS); if (off < 0 || (offset_t)(off + len) < 0 || off > MAXOFF_T || (off + len) > MAXOFF_T) return (ENXIO); if (vp->v_type != VREG) return (ENODEV); /* * Don't allow mapping to locked file */ if (vn_has_mandatory_locks(vp, tp->tn_mode)) { return (EAGAIN); } as_rangelock(as); error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags); if (error != 0) { as_rangeunlock(as); return (error); } vn_a.vp = vp; vn_a.offset = (u_offset_t)off; vn_a.type = flags & MAP_TYPE; vn_a.prot = prot; vn_a.maxprot = maxprot; vn_a.flags = flags & ~MAP_TYPE; vn_a.cred = cred; vn_a.amp = NULL; vn_a.szc = 0; vn_a.lgrp_mem_policy_flags = 0; error = as_map(as, *addrp, len, segvn_create, &vn_a); as_rangeunlock(as); return (error); } /* * tmp_addmap and tmp_delmap can't be called since the vp * maintained in the segvn mapping is NULL. */ /* ARGSUSED */ static int tmp_addmap( struct vnode *vp, offset_t off, struct as *as, caddr_t addr, size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, struct cred *cred, caller_context_t *ct) { return (0); } /* ARGSUSED */ static int tmp_delmap( struct vnode *vp, offset_t off, struct as *as, caddr_t addr, size_t len, uint_t prot, uint_t maxprot, uint_t flags, struct cred *cred, caller_context_t *ct) { return (0); } static int tmp_freesp(struct vnode *vp, struct flock64 *lp, int flag) { register int i; register struct tmpnode *tp = VTOTN(vp); int error; ASSERT(vp->v_type == VREG); ASSERT(lp->l_start >= 0); if (lp->l_len != 0) return (EINVAL); rw_enter(&tp->tn_rwlock, RW_WRITER); if (tp->tn_size == lp->l_start) { rw_exit(&tp->tn_rwlock); return (0); } /* * Check for any mandatory locks on the range */ if (MANDLOCK(vp, tp->tn_mode)) { long save_start; save_start = lp->l_start; if (tp->tn_size < lp->l_start) { /* * "Truncate up" case: need to make sure there * is no lock beyond current end-of-file. To * do so, we need to set l_start to the size * of the file temporarily. */ lp->l_start = tp->tn_size; } lp->l_type = F_WRLCK; lp->l_sysid = 0; lp->l_pid = ttoproc(curthread)->p_pid; i = (flag & (FNDELAY|FNONBLOCK)) ? 0 : SLPFLCK; if ((i = reclock(vp, lp, i, 0, lp->l_start, NULL)) != 0 || lp->l_type != F_UNLCK) { rw_exit(&tp->tn_rwlock); return (i ? i : EAGAIN); } lp->l_start = save_start; } VFSTOTM(vp->v_vfsp); rw_enter(&tp->tn_contents, RW_WRITER); error = tmpnode_trunc((struct tmount *)VFSTOTM(vp->v_vfsp), tp, (ulong_t)lp->l_start); rw_exit(&tp->tn_contents); rw_exit(&tp->tn_rwlock); return (error); } /* ARGSUSED */ static int tmp_space( struct vnode *vp, int cmd, struct flock64 *bfp, int flag, offset_t offset, cred_t *cred, caller_context_t *ct) { int error; if (cmd != F_FREESP) return (EINVAL); if ((error = convoff(vp, bfp, 0, (offset_t)offset)) == 0) { if ((bfp->l_start > MAXOFF_T) || (bfp->l_len > MAXOFF_T)) return (EFBIG); error = tmp_freesp(vp, bfp, flag); } return (error); } /* ARGSUSED */ static int tmp_seek( struct vnode *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct) { return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); } /* ARGSUSED2 */ static int tmp_rwlock(struct vnode *vp, int write_lock, caller_context_t *ctp) { struct tmpnode *tp = VTOTN(vp); if (write_lock) { rw_enter(&tp->tn_rwlock, RW_WRITER); } else { rw_enter(&tp->tn_rwlock, RW_READER); } return (write_lock); } /* ARGSUSED1 */ static void tmp_rwunlock(struct vnode *vp, int write_lock, caller_context_t *ctp) { struct tmpnode *tp = VTOTN(vp); rw_exit(&tp->tn_rwlock); } static int tmp_pathconf( struct vnode *vp, int cmd, ulong_t *valp, cred_t *cr, caller_context_t *ct) { struct tmpnode *tp = NULL; int error; switch (cmd) { case _PC_XATTR_EXISTS: if (vp->v_vfsp->vfs_flag & VFS_XATTR) { *valp = 0; /* assume no attributes */ error = 0; /* okay to ask */ tp = VTOTN(vp); rw_enter(&tp->tn_rwlock, RW_READER); if (tp->tn_xattrdp) { rw_enter(&tp->tn_xattrdp->tn_rwlock, RW_READER); /* do not count "." and ".." */ if (tp->tn_xattrdp->tn_dirents > 2) *valp = 1; rw_exit(&tp->tn_xattrdp->tn_rwlock); } rw_exit(&tp->tn_rwlock); } else { error = EINVAL; } break; case _PC_SATTR_ENABLED: case _PC_SATTR_EXISTS: *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && (vp->v_type == VREG || vp->v_type == VDIR); error = 0; break; default: error = fs_pathconf(vp, cmd, valp, cr, ct); } return (error); } struct vnodeops *tmp_vnodeops; const fs_operation_def_t tmp_vnodeops_template[] = { VOPNAME_OPEN, { .vop_open = tmp_open }, VOPNAME_CLOSE, { .vop_close = tmp_close }, VOPNAME_READ, { .vop_read = tmp_read }, VOPNAME_WRITE, { .vop_write = tmp_write }, VOPNAME_IOCTL, { .vop_ioctl = tmp_ioctl }, VOPNAME_GETATTR, { .vop_getattr = tmp_getattr }, VOPNAME_SETATTR, { .vop_setattr = tmp_setattr }, VOPNAME_ACCESS, { .vop_access = tmp_access }, VOPNAME_LOOKUP, { .vop_lookup = tmp_lookup }, VOPNAME_CREATE, { .vop_create = tmp_create }, VOPNAME_REMOVE, { .vop_remove = tmp_remove }, VOPNAME_LINK, { .vop_link = tmp_link }, VOPNAME_RENAME, { .vop_rename = tmp_rename }, VOPNAME_MKDIR, { .vop_mkdir = tmp_mkdir }, VOPNAME_RMDIR, { .vop_rmdir = tmp_rmdir }, VOPNAME_READDIR, { .vop_readdir = tmp_readdir }, VOPNAME_SYMLINK, { .vop_symlink = tmp_symlink }, VOPNAME_READLINK, { .vop_readlink = tmp_readlink }, VOPNAME_FSYNC, { .vop_fsync = tmp_fsync }, VOPNAME_INACTIVE, { .vop_inactive = tmp_inactive }, VOPNAME_FID, { .vop_fid = tmp_fid }, VOPNAME_RWLOCK, { .vop_rwlock = tmp_rwlock }, VOPNAME_RWUNLOCK, { .vop_rwunlock = tmp_rwunlock }, VOPNAME_SEEK, { .vop_seek = tmp_seek }, VOPNAME_SPACE, { .vop_space = tmp_space }, VOPNAME_GETPAGE, { .vop_getpage = tmp_getpage }, VOPNAME_PUTPAGE, { .vop_putpage = tmp_putpage }, VOPNAME_MAP, { .vop_map = tmp_map }, VOPNAME_ADDMAP, { .vop_addmap = tmp_addmap }, VOPNAME_DELMAP, { .vop_delmap = tmp_delmap }, VOPNAME_PATHCONF, { .vop_pathconf = tmp_pathconf }, VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, NULL, NULL };