63e4c6cdf9
When providing memory map information to userland, populate the vnode pointer for tmpfs files. Set the memory mapping to appear as a vnode type, to match FreeBSD 9 behavior. This fixes the use of tmpfs files with the dtrace pid provider, procstat -v, procfs, linprocfs, pmc (pmcstat), and ptrace (PT_VM_ENTRY). Submitted by: Eric Badger <eric@badgerio.us> (initial revision) Obtained from: Dell Inc. PR: 198431 MFC after: 2 weeks Reviewed by: jhb Approved by: kib (mentor)
251 lines
6.7 KiB
C
251 lines
6.7 KiB
C
/*-
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_status.c 8.3 (Berkeley) 2/17/94
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*
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/filedesc.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/rwlock.h>
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#include <sys/sbuf.h>
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#ifdef COMPAT_FREEBSD32
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#include <sys/sysent.h>
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#endif
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#include <sys/uio.h>
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#include <sys/vnode.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/procfs/procfs.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#define MEBUFFERSIZE 256
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/*
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* The map entries can *almost* be read with programs like cat. However,
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* large maps need special programs to read. It is not easy to implement
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* a program that can sense the required size of the buffer, and then
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* subsequently do a read with the appropriate size. This operation cannot
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* be atomic. The best that we can do is to allow the program to do a read
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* with an arbitrarily large buffer, and return as much as we can. We can
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* return an error code if the buffer is too small (EFBIG), then the program
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* can try a bigger buffer.
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*/
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int
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procfs_doprocmap(PFS_FILL_ARGS)
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{
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struct vmspace *vm;
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vm_map_t map;
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vm_map_entry_t entry, tmp_entry;
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struct vnode *vp;
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char *fullpath, *freepath;
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struct ucred *cred;
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int error;
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unsigned int last_timestamp;
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#ifdef COMPAT_FREEBSD32
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int wrap32 = 0;
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#endif
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PROC_LOCK(p);
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error = p_candebug(td, p);
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PROC_UNLOCK(p);
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if (error)
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return (error);
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if (uio->uio_rw != UIO_READ)
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return (EOPNOTSUPP);
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#ifdef COMPAT_FREEBSD32
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if (SV_CURPROC_FLAG(SV_ILP32)) {
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if (!(SV_PROC_FLAG(p, SV_ILP32)))
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return (EOPNOTSUPP);
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wrap32 = 1;
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}
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#endif
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vm = vmspace_acquire_ref(p);
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if (vm == NULL)
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return (ESRCH);
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map = &vm->vm_map;
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vm_map_lock_read(map);
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for (entry = map->header.next; entry != &map->header;
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entry = entry->next) {
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vm_object_t obj, tobj, lobj;
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int ref_count, shadow_count, flags;
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vm_offset_t e_start, e_end, addr;
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int resident, privateresident;
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char *type;
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vm_eflags_t e_eflags;
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vm_prot_t e_prot;
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if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
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continue;
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e_eflags = entry->eflags;
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e_prot = entry->protection;
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e_start = entry->start;
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e_end = entry->end;
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privateresident = 0;
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obj = entry->object.vm_object;
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if (obj != NULL) {
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VM_OBJECT_RLOCK(obj);
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if (obj->shadow_count == 1)
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privateresident = obj->resident_page_count;
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}
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cred = (entry->cred) ? entry->cred : (obj ? obj->cred : NULL);
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resident = 0;
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addr = entry->start;
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while (addr < entry->end) {
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if (pmap_extract(map->pmap, addr))
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resident++;
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addr += PAGE_SIZE;
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}
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for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
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if (tobj != obj)
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VM_OBJECT_RLOCK(tobj);
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if (lobj != obj)
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VM_OBJECT_RUNLOCK(lobj);
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lobj = tobj;
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}
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last_timestamp = map->timestamp;
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vm_map_unlock_read(map);
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freepath = NULL;
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fullpath = "-";
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if (lobj) {
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vp = NULL;
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switch (lobj->type) {
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default:
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case OBJT_DEFAULT:
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type = "default";
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break;
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case OBJT_VNODE:
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type = "vnode";
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vp = lobj->handle;
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vref(vp);
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break;
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case OBJT_SWAP:
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if ((lobj->flags & OBJ_TMPFS_NODE) != 0) {
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type = "vnode";
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if ((lobj->flags & OBJ_TMPFS) != 0) {
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vp = lobj->un_pager.swp.swp_tmpfs;
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vref(vp);
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}
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} else {
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type = "swap";
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}
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break;
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case OBJT_SG:
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case OBJT_DEVICE:
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type = "device";
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break;
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}
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if (lobj != obj)
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VM_OBJECT_RUNLOCK(lobj);
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flags = obj->flags;
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ref_count = obj->ref_count;
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shadow_count = obj->shadow_count;
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VM_OBJECT_RUNLOCK(obj);
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if (vp != NULL) {
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vn_fullpath(td, vp, &fullpath, &freepath);
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vrele(vp);
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}
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} else {
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type = "none";
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flags = 0;
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ref_count = 0;
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shadow_count = 0;
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}
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/*
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* format:
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* start, end, resident, private resident, cow, access, type,
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* charged, charged uid.
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*/
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error = sbuf_printf(sb,
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"0x%lx 0x%lx %d %d %p %s%s%s %d %d 0x%x %s %s %s %s %s %d\n",
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(u_long)e_start, (u_long)e_end,
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resident, privateresident,
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#ifdef COMPAT_FREEBSD32
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wrap32 ? NULL : obj, /* Hide 64 bit value */
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#else
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obj,
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#endif
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(e_prot & VM_PROT_READ)?"r":"-",
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(e_prot & VM_PROT_WRITE)?"w":"-",
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(e_prot & VM_PROT_EXECUTE)?"x":"-",
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ref_count, shadow_count, flags,
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(e_eflags & MAP_ENTRY_COW)?"COW":"NCOW",
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(e_eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC",
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type, fullpath,
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cred ? "CH":"NCH", cred ? cred->cr_ruid : -1);
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if (freepath != NULL)
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free(freepath, M_TEMP);
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vm_map_lock_read(map);
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if (error == -1) {
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error = 0;
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break;
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}
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if (last_timestamp != map->timestamp) {
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/*
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* Look again for the entry because the map was
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* modified while it was unlocked. Specifically,
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* the entry may have been clipped, merged, or deleted.
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*/
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vm_map_lookup_entry(map, e_end - 1, &tmp_entry);
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entry = tmp_entry;
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}
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}
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vm_map_unlock_read(map);
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vmspace_free(vm);
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return (error);
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}
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