Annotation of sys/miscfs/procfs/procfs_vfsops.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: procfs_vfsops.c,v 1.25 2007/06/18 08:30:07 jasper Exp $ */
! 2: /* $NetBSD: procfs_vfsops.c,v 1.25 1996/02/09 22:40:53 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1993 Jan-Simon Pendry
! 6: * Copyright (c) 1993
! 7: * The Regents of the University of California. All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to Berkeley by
! 10: * Jan-Simon Pendry.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: *
! 36: * @(#)procfs_vfsops.c 8.5 (Berkeley) 6/15/94
! 37: */
! 38:
! 39: /*
! 40: * procfs VFS interface
! 41: */
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/time.h>
! 45: #include <sys/kernel.h>
! 46: #include <sys/systm.h>
! 47: #include <sys/proc.h>
! 48: #include <sys/buf.h>
! 49: #include <sys/syslog.h>
! 50: #include <sys/mount.h>
! 51: #include <sys/signalvar.h>
! 52: #include <sys/vnode.h>
! 53: #include <sys/malloc.h>
! 54:
! 55: #include <miscfs/procfs/procfs.h>
! 56:
! 57: #include <uvm/uvm_extern.h>
! 58:
! 59: int procfs_mount(struct mount *, const char *, void *,
! 60: struct nameidata *, struct proc *);
! 61: int procfs_start(struct mount *, int, struct proc *);
! 62: int procfs_unmount(struct mount *, int, struct proc *);
! 63: int procfs_statfs(struct mount *, struct statfs *, struct proc *);
! 64: /*
! 65: * VFS Operations.
! 66: *
! 67: * mount system call
! 68: */
! 69: /* ARGSUSED */
! 70: int
! 71: procfs_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp,
! 72: struct proc *p)
! 73: {
! 74: size_t size;
! 75: struct procfsmount *pmnt;
! 76: struct procfs_args args;
! 77: int error;
! 78:
! 79: if (UIO_MX & (UIO_MX-1)) {
! 80: log(LOG_ERR, "procfs: invalid directory entry size");
! 81: return (EINVAL);
! 82: }
! 83:
! 84: if (mp->mnt_flag & MNT_UPDATE)
! 85: return (EOPNOTSUPP);
! 86:
! 87: if (data != NULL) {
! 88: error = copyin(data, &args, sizeof args);
! 89: if (error != 0)
! 90: return (error);
! 91:
! 92: if (args.version != PROCFS_ARGSVERSION)
! 93: return (EINVAL);
! 94: } else
! 95: args.flags = 0;
! 96:
! 97: mp->mnt_flag |= MNT_LOCAL;
! 98: pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount),
! 99: M_MISCFSMNT, M_WAITOK);
! 100:
! 101: mp->mnt_data = pmnt;
! 102: vfs_getnewfsid(mp);
! 103:
! 104: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
! 105: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
! 106: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
! 107: bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs"));
! 108: bcopy(&args, &mp->mnt_stat.mount_info.procfs_args, sizeof(args));
! 109:
! 110: #ifdef notyet
! 111: pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp);
! 112: #endif
! 113: pmnt->pmnt_flags = args.flags;
! 114:
! 115: return (0);
! 116: }
! 117:
! 118: /*
! 119: * unmount system call
! 120: */
! 121: int
! 122: procfs_unmount(struct mount *mp, int mntflags, struct proc *p)
! 123: {
! 124: int error;
! 125: extern int doforce;
! 126: int flags = 0;
! 127:
! 128: if (mntflags & MNT_FORCE) {
! 129: /* procfs can never be rootfs so don't check for it */
! 130: if (!doforce)
! 131: return (EINVAL);
! 132: flags |= FORCECLOSE;
! 133: }
! 134:
! 135: if ((error = vflush(mp, 0, flags)) != 0)
! 136: return (error);
! 137:
! 138: free(VFSTOPROC(mp), M_MISCFSMNT);
! 139: mp->mnt_data = 0;
! 140:
! 141: return (0);
! 142: }
! 143:
! 144: int
! 145: procfs_root(struct mount *mp, struct vnode **vpp)
! 146: {
! 147: int error;
! 148:
! 149: error = procfs_allocvp(mp, vpp, 0, Proot);
! 150: if (error)
! 151: return (error);
! 152: vn_lock(*vpp, LK_EXCLUSIVE, curproc);
! 153:
! 154: return (0);
! 155: }
! 156:
! 157: /* ARGSUSED */
! 158: int
! 159: procfs_start(struct mount *mp, int flags, struct proc *p)
! 160: {
! 161:
! 162: return (0);
! 163: }
! 164:
! 165: /*
! 166: * Get file system statistics.
! 167: */
! 168: int
! 169: procfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
! 170: {
! 171: struct vmtotal vmtotals;
! 172:
! 173: uvm_total(&vmtotals);
! 174: sbp->f_bsize = PAGE_SIZE;
! 175: sbp->f_iosize = PAGE_SIZE;
! 176: sbp->f_blocks = vmtotals.t_vm;
! 177: sbp->f_bfree = vmtotals.t_vm - vmtotals.t_avm;
! 178: sbp->f_bavail = 0;
! 179: sbp->f_files = maxproc; /* approx */
! 180: sbp->f_ffree = maxproc - nprocs; /* approx */
! 181: if (sbp != &mp->mnt_stat) {
! 182: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
! 183: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
! 184: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
! 185: bcopy(&mp->mnt_stat.mount_info.procfs_args,
! 186: &sbp->mount_info.procfs_args, sizeof(struct procfs_args));
! 187: }
! 188: strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
! 189: return (0);
! 190: }
! 191:
! 192:
! 193: #define procfs_sync ((int (*)(struct mount *, int, struct ucred *, \
! 194: struct proc *))nullop)
! 195:
! 196: #define procfs_fhtovp ((int (*)(struct mount *, struct fid *, \
! 197: struct vnode **))eopnotsupp)
! 198: #define procfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \
! 199: struct proc *))eopnotsupp)
! 200: #define procfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \
! 201: size_t, struct proc *))eopnotsupp)
! 202: #define procfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \
! 203: eopnotsupp)
! 204: #define procfs_vptofh ((int (*)(struct vnode *, struct fid *))eopnotsupp)
! 205: #define procfs_checkexp ((int (*)(struct mount *, struct mbuf *, \
! 206: int *, struct ucred **))eopnotsupp)
! 207:
! 208: const struct vfsops procfs_vfsops = {
! 209: procfs_mount,
! 210: procfs_start,
! 211: procfs_unmount,
! 212: procfs_root,
! 213: procfs_quotactl,
! 214: procfs_statfs,
! 215: procfs_sync,
! 216: procfs_vget,
! 217: procfs_fhtovp,
! 218: procfs_vptofh,
! 219: procfs_init,
! 220: procfs_sysctl,
! 221: procfs_checkexp
! 222: };
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