307 lines
7.4 KiB
C
307 lines
7.4 KiB
C
/* $NetBSD: dtfs_vfsops.c,v 1.23 2007/11/30 19:02:37 pooka Exp $ */
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/*
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* Copyright (c) 2006 Antti Kantee. All Rights Reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 OR
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* 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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#include <sys/types.h>
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#include <sys/resource.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <puffs.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <util.h>
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#include "dtfs.h"
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static int
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rtstr(struct puffs_usermount *pu, const char *str, enum vtype vt)
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{
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struct puffs_node *pn = puffs_getroot(pu);
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struct vattr *va = &pn->pn_va;
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struct dtfs_file *df = DTFS_PTOF(pn);
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char ltarg[256+1];
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if (sscanf(str, "%*s %256s", ltarg) != 1)
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return 1;
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dtfs_baseattrs(va, vt, 2);
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df->df_linktarget = estrdup(ltarg);
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va->va_nlink = 1;
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va->va_size = strlen(df->df_linktarget);
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puffs_setrootinfo(pu, vt, 0, 0);
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return 0;
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}
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static int
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rtdev(struct puffs_usermount *pu, const char *str, enum vtype vt)
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{
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struct puffs_node *pn = puffs_getroot(pu);
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struct vattr *va = &pn->pn_va;
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int major, minor;
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if (sscanf(str, "%*s %d %d", &major, &minor) != 2)
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return 1;
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dtfs_baseattrs(va, vt, 2);
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va->va_nlink = 1;
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va->va_rdev = makedev(major, minor);
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if (vt == VBLK)
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va->va_mode |= S_IFBLK;
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else
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va->va_mode |= S_IFCHR;
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puffs_setrootinfo(pu, vt, 0, va->va_rdev);
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return 0;
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}
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static int
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rtnorm(struct puffs_usermount *pu, const char *str, enum vtype vt)
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{
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struct puffs_node *pn = puffs_getroot(pu);
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struct vattr *va = &pn->pn_va;
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dtfs_baseattrs(va, vt, 2);
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if (vt == VDIR)
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va->va_nlink = 2;
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else
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va->va_nlink = 1;
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puffs_setrootinfo(pu, vt, 0, 0);
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return 0;
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}
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struct rtype {
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char *tstr;
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enum vtype vt;
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int (*pfunc)(struct puffs_usermount *, const char *, enum vtype);
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} rtypes[] = {
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{ "reg", VREG, rtnorm },
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{ "dir", VDIR, rtnorm },
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{ "blk", VBLK, rtdev },
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{ "chr", VCHR, rtdev },
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{ "lnk", VLNK, rtstr },
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{ "sock", VSOCK, rtnorm },
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{ "fifo", VFIFO, rtnorm }
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};
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#define NTYPES (sizeof(rtypes) / sizeof(rtypes[0]))
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int
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dtfs_domount(struct puffs_usermount *pu, const char *typestr)
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{
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struct dtfs_mount *dtm;
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struct dtfs_file *dff;
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struct puffs_node *pn;
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int i;
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/* create mount-local thingie */
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dtm = puffs_getspecific(pu);
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dtm->dtm_nextfileid = 3;
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dtm->dtm_nfiles = 1;
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dtm->dtm_fsizes = 0;
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LIST_INIT(&dtm->dtm_pollent);
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/*
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* create root directory, do it "by hand" to avoid special-casing
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* dtfs_genfile()
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*/
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dff = dtfs_newdir();
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dff->df_dotdot = NULL;
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pn = puffs_pn_new(pu, dff);
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if (!pn)
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errx(1, "puffs_newpnode");
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puffs_setroot(pu, pn);
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if (!typestr) {
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rtnorm(pu, NULL, VDIR);
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} else {
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for (i = 0; i < NTYPES; i++) {
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if (strncmp(rtypes[i].tstr, typestr,
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strlen(rtypes[i].tstr)) == 0) {
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if (rtypes[i].pfunc(pu, typestr,
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rtypes[i].vt) != 0) {
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fprintf(stderr, "failed to parse "
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"\"%s\"\n", typestr);
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return 1;
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}
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break;
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}
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}
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if (i == NTYPES) {
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fprintf(stderr, "no maching type for %s\n", typestr);
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return 1;
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}
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}
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return 0;
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}
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/*
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* statvfs() should fill in the following members of struct statvfs:
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*
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* unsigned long f_bsize; file system block size
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* unsigned long f_frsize; fundamental file system block size
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* unsigned long f_iosize; optimal file system block size
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* fsblkcnt_t f_blocks; number of blocks in file system,
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* (in units of f_frsize)
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*
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* fsblkcnt_t f_bfree; free blocks avail in file system
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* fsblkcnt_t f_bavail; free blocks avail to non-root
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* fsblkcnt_t f_bresvd; blocks reserved for root
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*
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* fsfilcnt_t f_files; total file nodes in file system
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* fsfilcnt_t f_ffree; free file nodes in file system
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* fsfilcnt_t f_favail; free file nodes avail to non-root
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* fsfilcnt_t f_fresvd; file nodes reserved for root
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*
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*
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* The rest are filled in by the kernel.
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*/
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#define ROUND(a,b) (((a) + ((b)-1)) & ~((b)-1))
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#define NFILES 1024*1024
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int
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dtfs_fs_statvfs(struct puffs_usermount *pu, struct statvfs *sbp)
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{
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struct rlimit rlim;
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struct dtfs_mount *dtm;
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off_t btot, bfree;
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int pgsize;
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dtm = puffs_getspecific(pu);
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pgsize = getpagesize();
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memset(sbp, 0, sizeof(struct statvfs));
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/*
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* Use datasize rlimit as an _approximation_ for free size.
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* This, of course, is not accurate due to overhead and not
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* accounting for metadata.
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*/
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if (getrlimit(RLIMIT_DATA, &rlim) == 0)
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btot = rlim.rlim_cur;
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else
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btot = 16*1024*1024;
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bfree = btot - dtm->dtm_fsizes;
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sbp->f_blocks = ROUND(btot, pgsize) / pgsize;
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sbp->f_files = NFILES;
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sbp->f_bsize = sbp->f_frsize = sbp->f_iosize = pgsize;
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sbp->f_bfree = sbp->f_bavail = ROUND(bfree, pgsize) / pgsize;
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sbp->f_ffree = sbp->f_favail = NFILES - dtm->dtm_nfiles;
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sbp->f_bresvd = sbp->f_fresvd = 0;
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return 0;
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}
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#undef ROUND
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static void *
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addrcmp(struct puffs_usermount *pu, struct puffs_node *pn, void *arg)
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{
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if (pn == arg)
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return pn;
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return NULL;
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}
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int
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dtfs_fs_fhtonode(struct puffs_usermount *pu, void *fid, size_t fidsize,
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struct puffs_newinfo *pni)
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{
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struct dtfs_fid *dfid;
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struct puffs_node *pn;
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assert(fidsize == sizeof(struct dtfs_fid));
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dfid = fid;
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pn = puffs_pn_nodewalk(pu, addrcmp, dfid->dfid_addr);
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if (pn == NULL)
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return EINVAL;
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if (pn->pn_va.va_fileid != dfid->dfid_fileid
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|| pn->pn_va.va_gen != dfid->dfid_gen)
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return EINVAL;
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puffs_newinfo_setcookie(pni, pn);
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puffs_newinfo_setvtype(pni, pn->pn_va.va_type);
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puffs_newinfo_setsize(pni, pn->pn_va.va_size);
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puffs_newinfo_setrdev(pni, pn->pn_va.va_rdev);
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return 0;
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}
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int
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dtfs_fs_nodetofh(struct puffs_usermount *pu, void *cookie,
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void *fid, size_t *fidsize)
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{
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struct puffs_node *pn = cookie;
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struct dtfs_fid *dfid;
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extern int dynamicfh;
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if (dynamicfh == 0) {
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assert(*fidsize >= sizeof(struct dtfs_fid));
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} else {
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if (*fidsize < sizeof(struct dtfs_fid)) {
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*fidsize = sizeof(struct dtfs_fid);
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return E2BIG;
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}
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*fidsize = sizeof(struct dtfs_fid);
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}
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dfid = fid;
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dfid->dfid_addr = pn;
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dfid->dfid_fileid = pn->pn_va.va_fileid;
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dfid->dfid_gen = pn->pn_va.va_gen;
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return 0;
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}
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void
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dtfs_fs_suspend(struct puffs_usermount *pu, int status)
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{
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printf("suspend status %d\n", status);
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if (status == 1)
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sleep(3);
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}
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int
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dtfs_fs_unmount(struct puffs_usermount *pu, int flags)
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{
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return 0;
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}
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