7adb177693
- Remove tmpfs_zone_xxx KPI, the uma(9) wrapper, since they does not bring any value now. - Use |= instead of = when applying VV_ROOT flag. - Remove tm_avariable_nodes list. Use uma to hold the released nodes. - init/destory interlock mutex of node when init/fini instead of ctor/dtor. - Change memory computing using u_int to fix negative value in 2G mem machine. - Remove unnecessary bzero's - Rely uma logic to make file id allocation harder to guess. - Fix some unsigned/signed related things. Make sure we respect -o size=xxxx - Use wire instead of hold a page. - Pass allocate_zero to obtain zeroed pages upon first use. Submitted by: Howard Su Approved by: re (tmpfs blanket, kensmith)
466 lines
12 KiB
C
466 lines
12 KiB
C
/* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */
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/*
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* Copyright (c) 2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal, developed as part of Google's Summer of Code
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* 2005 program.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Efficient memory file system.
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*
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* tmpfs is a file system that uses NetBSD's virtual memory sub-system
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* (the well-known UVM) to store file data and metadata in an efficient
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* way. This means that it does not follow the structure of an on-disk
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* file system because it simply does not need to. Instead, it uses
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* memory-specific data structures and algorithms to automatically
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* allocate and release resources.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_param.h>
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#include <fs/tmpfs/tmpfs.h>
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/*
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* Default permission for root node
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*/
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#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
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MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures");
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/* --------------------------------------------------------------------- */
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static int tmpfs_mount(struct mount *, struct thread *);
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static int tmpfs_unmount(struct mount *, int, struct thread *);
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static int tmpfs_root(struct mount *, int flags, struct vnode **,
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struct thread *);
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static int tmpfs_fhtovp(struct mount *, struct fid *, struct vnode **);
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static int tmpfs_statfs(struct mount *, struct statfs *, struct thread *);
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/* --------------------------------------------------------------------- */
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static const char *tmpfs_opts[] = {
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"from", "size", "inodes", "uid", "gid", "mode",
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NULL
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};
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/* --------------------------------------------------------------------- */
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#define SWI_MAXMIB 3
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static u_int
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get_swpgtotal(void)
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{
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struct xswdev xsd;
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char *sname = "vm.swap_info";
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int soid[SWI_MAXMIB], oid[2];
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u_int unswdev, total, dmmax, nswapdev;
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size_t mibi, len;
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total = 0;
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len = sizeof(dmmax);
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if (kernel_sysctlbyname(curthread, "vm.dmmax", &dmmax, &len,
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NULL, 0, NULL, 0) != 0)
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return total;
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len = sizeof(nswapdev);
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if (kernel_sysctlbyname(curthread, "vm.nswapdev",
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&nswapdev, &len,
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NULL, 0, NULL, 0) != 0)
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return total;
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mibi = (SWI_MAXMIB - 1) * sizeof(int);
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oid[0] = 0;
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oid[1] = 3;
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if (kernel_sysctl(curthread, oid, 2,
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soid, &mibi, (void *)sname, strlen(sname),
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NULL, 0) != 0)
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return total;
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mibi = (SWI_MAXMIB - 1);
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for (unswdev = 0; unswdev < nswapdev; ++unswdev) {
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soid[mibi] = unswdev;
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len = sizeof(struct xswdev);
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if (kernel_sysctl(curthread,
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soid, mibi + 1, &xsd, &len, NULL, 0,
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NULL, 0) != 0)
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return total;
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if (len == sizeof(struct xswdev))
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total += (xsd.xsw_nblks - dmmax);
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}
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/* Not Reached */
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return total;
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}
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/* --------------------------------------------------------------------- */
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static int
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tmpfs_node_ctor(void *mem, int size, void *arg, int flags)
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{
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struct tmpfs_node *node = (struct tmpfs_node *)mem;
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if (node->tn_id == 0) {
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/* if this node structure first time used */
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struct tmpfs_mount *tmp = (struct tmpfs_mount *)arg;
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TMPFS_LOCK(tmp);
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node->tn_id = tmp->tm_nodes_last++;
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TMPFS_UNLOCK(tmp);
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node->tn_gen = arc4random();
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}
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else {
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node->tn_gen++;
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}
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node->tn_size = 0;
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node->tn_status = 0;
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node->tn_flags = 0;
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node->tn_links = 0;
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node->tn_lockf = NULL;
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node->tn_vnode = NULL;
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node->tn_vpstate = 0;
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node->tn_lookup_dirent = NULL;
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return (0);
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}
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static void
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tmpfs_node_dtor(void *mem, int size, void *arg)
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{
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struct tmpfs_node *node = (struct tmpfs_node *)mem;
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node->tn_type = VNON;
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}
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static int
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tmpfs_node_init(void *mem, int size, int flags)
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{
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struct tmpfs_node *node = (struct tmpfs_node *)mem;
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node->tn_id = 0;
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mtx_init(&node->tn_interlock, "tmpfs node interlock", NULL, MTX_DEF);
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return (0);
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}
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static void
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tmpfs_node_fini(void *mem, int size)
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{
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struct tmpfs_node *node = (struct tmpfs_node *)mem;
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mtx_destroy(&node->tn_interlock);
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}
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static int
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tmpfs_mount(struct mount *mp, struct thread *l)
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{
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struct tmpfs_args args;
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struct tmpfs_mount *tmp;
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struct tmpfs_node *root;
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size_t pages, mem_size;
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ino_t nodes;
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int error;
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if (vfs_filteropt(mp->mnt_optnew, tmpfs_opts))
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return (EINVAL);
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if (mp->mnt_flag & MNT_UPDATE) {
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/* XXX: There is no support yet to update file system
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* settings. Should be added. */
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return EOPNOTSUPP;
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}
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if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &args.ta_root_gid) != 1)
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args.ta_root_gid = 0;
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if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &args.ta_root_uid) != 1)
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args.ta_root_uid = 0;
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if (vfs_scanopt(mp->mnt_optnew, "mode", "%o", &args.ta_root_mode) != 1)
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args.ta_root_mode = TMPFS_DEFAULT_ROOT_MODE;
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if(vfs_scanopt(mp->mnt_optnew, "inodes", "%d", &args.ta_nodes_max) != 1)
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args.ta_nodes_max = 0;
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if(vfs_scanopt(mp->mnt_optnew,
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"size",
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"%qu", &args.ta_size_max) != 1)
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args.ta_size_max = 0;
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/* Do not allow mounts if we do not have enough memory to preserve
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* the minimum reserved pages. */
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mem_size = cnt.v_free_count + cnt.v_inactive_count + get_swpgtotal();
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mem_size -= mem_size > cnt.v_wire_count ? cnt.v_wire_count : mem_size;
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if (mem_size < TMPFS_PAGES_RESERVED)
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return ENOSPC;
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/* Get the maximum number of memory pages this file system is
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* allowed to use, based on the maximum size the user passed in
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* the mount structure. A value of zero is treated as if the
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* maximum available space was requested. */
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if (args.ta_size_max < PAGE_SIZE || args.ta_size_max >= SIZE_MAX)
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pages = SIZE_MAX;
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else
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pages = args.ta_size_max / PAGE_SIZE +
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(args.ta_size_max % PAGE_SIZE == 0 ? 0 : 1);
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MPASS(pages > 0);
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if (args.ta_nodes_max <= 3)
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nodes = 3 + pages * PAGE_SIZE / 1024;
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else
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nodes = args.ta_nodes_max;
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MPASS(nodes >= 3);
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/* Allocate the tmpfs mount structure and fill it. */
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tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount),
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M_TMPFSMNT, M_WAITOK | M_ZERO);
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mtx_init(&tmp->allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF);
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tmp->tm_nodes_max = nodes;
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tmp->tm_nodes_last = 2;
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tmp->tm_nodes_inuse = 0;
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tmp->tm_maxfilesize = get_swpgtotal() * PAGE_SIZE;
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LIST_INIT(&tmp->tm_nodes_used);
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tmp->tm_pages_max = pages;
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tmp->tm_pages_used = 0;
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tmp->tm_dirent_pool = uma_zcreate(
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"TMPFS dirent",
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sizeof(struct tmpfs_dirent),
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NULL, NULL, NULL, NULL,
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UMA_ALIGN_PTR,
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0);
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tmp->tm_node_pool = uma_zcreate(
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"TMPFS node",
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sizeof(struct tmpfs_node),
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tmpfs_node_ctor, tmpfs_node_dtor,
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tmpfs_node_init, tmpfs_node_fini,
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UMA_ALIGN_PTR,
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0);
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tmpfs_str_zone_create(&tmp->tm_str_pool);
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/* Allocate the root node. */
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error = tmpfs_alloc_node(tmp, VDIR, args.ta_root_uid,
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args.ta_root_gid, args.ta_root_mode & ALLPERMS, NULL, NULL,
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VNOVAL, l, &root);
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if (error != 0 || root == NULL) {
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tmpfs_str_zone_destroy(&tmp->tm_str_pool);
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uma_zdestroy(tmp->tm_node_pool);
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uma_zdestroy(tmp->tm_dirent_pool);
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free(tmp, M_TMPFSMNT);
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return error;
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}
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tmp->tm_root = root;
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_kern_flag |= MNTK_MPSAFE;
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MNT_IUNLOCK(mp);
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mp->mnt_data = tmp;
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mp->mnt_stat.f_namemax = MAXNAMLEN;
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vfs_getnewfsid(mp);
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vfs_mountedfrom(mp, "tmpfs");
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return 0;
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}
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/* --------------------------------------------------------------------- */
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/* ARGSUSED2 */
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static int
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tmpfs_unmount(struct mount *mp, int mntflags, struct thread *l)
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{
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int error;
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int flags = 0;
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struct tmpfs_mount *tmp;
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struct tmpfs_node *node;
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/* Handle forced unmounts. */
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/* Finalize all pending I/O. */
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error = vflush(mp, 0, flags, l);
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if (error != 0)
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return error;
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tmp = VFS_TO_TMPFS(mp);
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/* Free all associated data. The loop iterates over the linked list
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* we have containing all used nodes. For each of them that is
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* a directory, we free all its directory entries. Note that after
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* freeing a node, it will automatically go to the available list,
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* so we will later have to iterate over it to release its items. */
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node = LIST_FIRST(&tmp->tm_nodes_used);
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while (node != NULL) {
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struct tmpfs_node *next;
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if (node->tn_type == VDIR) {
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struct tmpfs_dirent *de;
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de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
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while (de != NULL) {
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struct tmpfs_dirent *nde;
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nde = TAILQ_NEXT(de, td_entries);
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tmpfs_free_dirent(tmp, de, FALSE);
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de = nde;
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node->tn_size -= sizeof(struct tmpfs_dirent);
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}
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}
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next = LIST_NEXT(node, tn_entries);
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tmpfs_free_node(tmp, node);
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node = next;
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}
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uma_zdestroy(tmp->tm_dirent_pool);
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uma_zdestroy(tmp->tm_node_pool);
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tmpfs_str_zone_destroy(&tmp->tm_str_pool);
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mtx_destroy(&tmp->allnode_lock);
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MPASS(tmp->tm_pages_used == 0);
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/* Throw away the tmpfs_mount structure. */
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free(mp->mnt_data, M_TMPFSMNT);
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mp->mnt_data = NULL;
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MNT_ILOCK(mp);
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mp->mnt_flag &= ~MNT_LOCAL;
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MNT_IUNLOCK(mp);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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static int
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tmpfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
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{
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int error;
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error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, vpp, td);
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if (!error)
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(*vpp)->v_vflag |= VV_ROOT;
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return error;
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}
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/* --------------------------------------------------------------------- */
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static int
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tmpfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
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{
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boolean_t found;
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struct tmpfs_fid *tfhp;
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struct tmpfs_mount *tmp;
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struct tmpfs_node *node;
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tmp = VFS_TO_TMPFS(mp);
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tfhp = (struct tmpfs_fid *)fhp;
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if (tfhp->tf_len != sizeof(struct tmpfs_fid))
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return EINVAL;
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if (tfhp->tf_id >= tmp->tm_nodes_max)
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return EINVAL;
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found = FALSE;
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TMPFS_LOCK(tmp);
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LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) {
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if (node->tn_id == tfhp->tf_id &&
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node->tn_gen == tfhp->tf_gen) {
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found = TRUE;
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break;
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}
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}
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TMPFS_UNLOCK(tmp);
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return found ? tmpfs_alloc_vp(mp, node, vpp, curthread) : EINVAL;
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}
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/* --------------------------------------------------------------------- */
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/* ARGSUSED2 */
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static int
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tmpfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *l)
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{
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fsfilcnt_t freenodes;
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struct tmpfs_mount *tmp;
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tmp = VFS_TO_TMPFS(mp);
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sbp->f_iosize = PAGE_SIZE;
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sbp->f_bsize = PAGE_SIZE;
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sbp->f_blocks = TMPFS_PAGES_MAX(tmp);
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sbp->f_bavail = sbp->f_bfree = TMPFS_PAGES_AVAIL(tmp);
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freenodes = MIN(tmp->tm_nodes_max - tmp->tm_nodes_inuse,
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TMPFS_PAGES_AVAIL(tmp) * PAGE_SIZE / sizeof(struct tmpfs_node));
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sbp->f_files = freenodes + tmp->tm_nodes_inuse;
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sbp->f_ffree = freenodes;
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/* sbp->f_owner = tmp->tn_uid; */
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return 0;
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}
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/* --------------------------------------------------------------------- */
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/*
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* tmpfs vfs operations.
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*/
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struct vfsops tmpfs_vfsops = {
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.vfs_mount = tmpfs_mount,
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.vfs_unmount = tmpfs_unmount,
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.vfs_root = tmpfs_root,
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.vfs_statfs = tmpfs_statfs,
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.vfs_fhtovp = tmpfs_fhtovp,
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};
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VFS_SET(tmpfs_vfsops, tmpfs, 0);
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