src/sys/miscfs/kernfs/kernfs_vnops.c - diff

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Diff for /src/sys/miscfs/kernfs/kernfs_vnops.c between version 1.57 and 1.74

version 1.57, 1998/03/01 02:21:04

version 1.74, 2001/02/04 10:20:00

Line 42

* Kernel parameter filesystem (/kern)

#ifndef _LKM

#include "opt_uvm.h"

#endif

#include <sys/param.h>

#include <sys/systm.h>

#include <sys/kernel.h>

Line 66

Line 62

#include <miscfs/genfs/genfs.h>

#include <miscfs/kernfs/kernfs.h>

#if defined(UVM)

#include <vm/vm.h>

#include <uvm/uvm_extern.h>

#endif

#define KSTRING 256 /* Largest I/O available via this filesystem */

#define UIO_MX 32

Line 85 struct kern_target kern_targets[] = {

Line 78 struct kern_target kern_targets[] = {

{ DT_DIR, N("."), 0, KTT_NULL, VDIR, DIR_MODE },

{ DT_DIR, N(".."), 0, KTT_NULL, VDIR, DIR_MODE },

{ DT_REG, N("boottime"), &boottime.tv_sec, KTT_INT, VREG, READ_MODE },

{ DT_REG, N("copyright"), copyright, KTT_STRING, VREG, READ_MODE },

/* XXX cast away const */

{ DT_REG, N("copyright"), (void *)copyright,

KTT_STRING, VREG, READ_MODE },

{ DT_REG, N("hostname"), 0, KTT_HOSTNAME, VREG, WRITE_MODE },

{ DT_REG, N("hz"), &hz, KTT_INT, VREG, READ_MODE },

{ DT_REG, N("loadavg"), 0, KTT_AVENRUN, VREG, READ_MODE },

{ DT_REG, N("msgbuf"), 0, KTT_MSGBUF, VREG, READ_MODE },

#if defined(UVM)

{ DT_REG, N("pagesize"), &uvmexp.pagesize, KTT_INT, VREG, READ_MODE },

#else

{ DT_REG, N("pagesize"), &cnt.v_page_size, KTT_INT, VREG, READ_MODE },

#endif

{ DT_REG, N("physmem"), &physmem, KTT_INT, VREG, READ_MODE },

#if 0

{ DT_DIR, N("root"), 0, KTT_NULL, VDIR, DIR_MODE },

Line 102 struct kern_target kern_targets[] = {

Line 93 struct kern_target kern_targets[] = {

{ DT_BLK, N("rootdev"), &rootdev, KTT_DEVICE, VBLK, READ_MODE },

{ DT_CHR, N("rrootdev"), &rrootdev, KTT_DEVICE, VCHR, READ_MODE },

{ DT_REG, N("time"), 0, KTT_TIME, VREG, READ_MODE },

{ DT_REG, N("version"), version, KTT_STRING, VREG, READ_MODE },

/* XXX cast away const */

{ DT_REG, N("version"), (void *)version,

KTT_STRING, VREG, READ_MODE },

#undef N

};

static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);

int kernfs_lookup __P((void *));

#define kernfs_create genfs_eopnotsupp

#define kernfs_create genfs_eopnotsupp_rele

#define kernfs_mknod genfs_eopnotsupp

#define kernfs_mknod genfs_eopnotsupp_rele

#define kernfs_open genfs_nullop

#define kernfs_close genfs_nullop

int kernfs_access __P((void *));

Line 117 int kernfs_getattr __P((void *));

Line 110 int kernfs_getattr __P((void *));

int kernfs_setattr __P((void *));

int kernfs_read __P((void *));

int kernfs_write __P((void *));

#define kernfs_ioctl genfs_eopnotsupp

#define kernfs_fcntl genfs_fcntl

#define kernfs_ioctl genfs_enoioctl

#define kernfs_poll genfs_poll

#define kernfs_revoke genfs_revoke

#define kernfs_mmap genfs_eopnotsupp

#define kernfs_fsync genfs_nullop

#define kernfs_seek genfs_nullop

#define kernfs_remove genfs_eopnotsupp

#define kernfs_remove genfs_eopnotsupp_rele

int kernfs_link __P((void *));

#define kernfs_rename genfs_eopnotsupp

#define kernfs_rename genfs_eopnotsupp_rele

#define kernfs_mkdir genfs_eopnotsupp

#define kernfs_mkdir genfs_eopnotsupp_rele

#define kernfs_rmdir genfs_eopnotsupp

#define kernfs_rmdir genfs_eopnotsupp_rele

int kernfs_symlink __P((void *));

int kernfs_readdir __P((void *));

#define kernfs_readlink genfs_eopnotsupp

#define kernfs_abortop genfs_abortop

int kernfs_inactive __P((void *));

int kernfs_reclaim __P((void *));

#define kernfs_lock genfs_nolock

#define kernfs_lock genfs_lock

#define kernfs_unlock genfs_nounlock

#define kernfs_unlock genfs_unlock

#define kernfs_bmap genfs_badop

#define kernfs_strategy genfs_badop

int kernfs_print __P((void *));

#define kernfs_islocked genfs_noislocked

#define kernfs_islocked genfs_islocked

int kernfs_pathconf __P((void *));

#define kernfs_advlock genfs_eopnotsupp

#define kernfs_advlock genfs_einval

#define kernfs_blkatoff genfs_eopnotsupp

#define kernfs_valloc genfs_eopnotsupp

#define kernfs_vfree genfs_nullop

Line 153 int kernfs_xread __P((struct kern_target

Line 147 int kernfs_xread __P((struct kern_target

int kernfs_xwrite __P((struct kern_target *, char *, int));

int (**kernfs_vnodeop_p) __P((void *));

struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {

const struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {

{ &vop_default_desc, vn_default_error },

{ &vop_lookup_desc, kernfs_lookup }, /* lookup */

{ &vop_create_desc, kernfs_create }, /* create */

Line 165 struct vnodeopv_entry_desc kernfs_vnodeo

Line 159 struct vnodeopv_entry_desc kernfs_vnodeo

{ &vop_setattr_desc, kernfs_setattr }, /* setattr */

{ &vop_read_desc, kernfs_read }, /* read */

{ &vop_write_desc, kernfs_write }, /* write */

{ &vop_fcntl_desc, kernfs_fcntl }, /* fcntl */

{ &vop_ioctl_desc, kernfs_ioctl }, /* ioctl */

{ &vop_poll_desc, kernfs_poll }, /* poll */

{ &vop_revoke_desc, kernfs_revoke }, /* revoke */

Line 198 struct vnodeopv_entry_desc kernfs_vnodeo

Line 193 struct vnodeopv_entry_desc kernfs_vnodeo

{ &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */

{ (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL }

};

struct vnodeopv_desc kernfs_vnodeop_opv_desc =

const struct vnodeopv_desc kernfs_vnodeop_opv_desc =

{ &kernfs_vnodeop_p, kernfs_vnodeop_entries };

int

Line 270 kernfs_xread(kt, off, bufp, len)

Line 265 kernfs_xread(kt, off, bufp, len)

if (xlen >= (len-2))

return (EINVAL);

bcopy(cp, *bufp, xlen);

memcpy(*bufp, cp, xlen);

(*bufp)[xlen] = '\n';

(*bufp)[xlen+1] = '\0';

break;

Line 305 kernfs_xwrite(kt, buf, len)

Line 300 kernfs_xwrite(kt, buf, len)

case KTT_HOSTNAME:

if (buf[len-1] == '\n')

--len;

bcopy(buf, hostname, len);

memcpy(hostname, buf, len);

hostname[len] = '\0';

hostnamelen = len;

return (0);

Line 335 kernfs_lookup(v)

Line 330 kernfs_lookup(v)

const char *pname = cnp->cn_nameptr;

struct kern_target *kt;

struct vnode *fvp;

int error, i;

int error, i, wantpunlock;

#ifdef KERNFS_DIAGNOSTIC

printf("kernfs_lookup(%p)\n", ap);

Line 344 kernfs_lookup(v)

Line 339 kernfs_lookup(v)

#endif

*vpp = NULLVP;

cnp->cn_flags &= ~PDIRUNLOCK;

if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)

return (EROFS);

VOP_UNLOCK(dvp, 0);

if (cnp->cn_namelen == 1 && *pname == '.') {

*vpp = dvp;

VREF(dvp);

vn_lock(dvp, LK_SHARED | LK_RETRY);

return (0);

}

* This code only supports a flat directory, so we don't

* need to worry about ..

#if 0

if (cnp->cn_namelen == 4 && bcmp(pname, "root", 4) == 0) {

if (cnp->cn_namelen == 4 && memcmp(pname, "root", 4) == 0) {

*vpp = rootdir;

VREF(rootdir);

vn_lock(rootdir, LK_SHARED | LK_RETRY);

Line 365 kernfs_lookup(v)

Line 364 kernfs_lookup(v)

}

#endif

wantpunlock = (~cnp->cn_flags & (LOCKPARENT | ISLASTCN));

for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) {

if (cnp->cn_namelen == kt->kt_namlen &&

bcmp(kt->kt_name, pname, cnp->cn_namelen) == 0)

memcmp(kt->kt_name, pname, cnp->cn_namelen) == 0)

goto found;

}

Line 375 kernfs_lookup(v)

Line 376 kernfs_lookup(v)

printf("kernfs_lookup: i = %d, failed", i);

#endif

vn_lock(dvp, LK_SHARED | LK_RETRY);

return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);

found:

Line 383 found:

dev_t *dp = kt->kt_data;

loop:

if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) {

vn_lock(dvp, LK_SHARED | LK_RETRY);

return (ENOENT);

}

*vpp = fvp;

if (vget(fvp, LK_EXCLUSIVE))

goto loop;

if (wantpunlock) {

VOP_UNLOCK(dvp, 0);

cnp->cn_flags |= PDIRUNLOCK;

}

return (0);

}

Line 397 found:

Line 400 found:

#endif

error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp);

if (error) {

vn_lock(dvp, LK_SHARED | LK_RETRY);

return (error);

}

Line 405 found:

Line 407 found:

M_WAITOK);

VTOKERN(fvp)->kf_kt = kt;

fvp->v_type = kt->kt_vtype;

vn_lock(fvp, LK_SHARED | LK_RETRY);

vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY);

*vpp = fvp;

#ifdef KERNFS_DIAGNOSTIC

printf("kernfs_lookup: newvp = %p\n", fvp);

#endif

if (wantpunlock) {

VOP_UNLOCK(dvp, 0);

cnp->cn_flags |= PDIRUNLOCK;

}

return (0);

}

Line 454 kernfs_getattr(v)

Line 460 kernfs_getattr(v)

int error = 0;

char strbuf[KSTRING], *buf;

bzero((caddr_t) vap, sizeof(*vap));

memset((caddr_t) vap, 0, sizeof(*vap));

vattr_null(vap);

vap->va_uid = 0;

vap->va_gid = 0;

Line 607 kernfs_readdir(v)

Line 613 kernfs_readdir(v)

struct uio *uio = ap->a_uio;

struct dirent d;

struct kern_target *kt;

int i;

off_t i;

int error;

off_t *cookies = NULL;

int ncookies = 0, nc = 0;

Line 622 kernfs_readdir(v)

Line 628 kernfs_readdir(v)

error = 0;

i = uio->uio_offset;

bzero((caddr_t)&d, UIO_MX);

if (i >= nkern_targets)

return 0;

memset((caddr_t)&d, 0, UIO_MX);

d.d_reclen = UIO_MX;

if (ap->a_ncookies) {

nc = uio->uio_resid / UIO_MX;

nc = min(nc, (nkern_targets - i));

MALLOC(cookies, off_t *, nc * sizeof(off_t), M_TEMP,

cookies = malloc(nc * sizeof(off_t), M_TEMP, M_WAITOK);

M_WAITOK);

*ap->a_cookies = cookies;

}

for (kt = &kern_targets[i];

uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) {

#ifdef KERNFS_DIAGNOSTIC

printf("kernfs_readdir: i = %d\n", i);

printf("kernfs_readdir: i = %d\n", (int)i);

#endif

if (kt->kt_tag == KTT_DEVICE) {

Line 649 kernfs_readdir(v)

Line 658 kernfs_readdir(v)

d.d_fileno = i + 3;

d.d_namlen = kt->kt_namlen;

bcopy(kt->kt_name, d.d_name, kt->kt_namlen + 1);

memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1);

d.d_type = kt->kt_type;

if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0)

Line 662 kernfs_readdir(v)

Line 671 kernfs_readdir(v)

if (ap->a_ncookies) {

if (error) {

FREE(*ap->a_cookies, M_TEMP);

free(*ap->a_cookies, M_TEMP);

*ap->a_ncookies = 0;

*ap->a_cookies = NULL;

} else

Line 746 kernfs_pathconf(v)

Line 755 kernfs_pathconf(v)

case _PC_VDISABLE:

*ap->a_retval = _POSIX_VDISABLE;

return (0);

case _PC_SYNC_IO:

*ap->a_retval = 1;

return (0);

default:

return (EINVAL);

}

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