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

Return to kernfs_vnops.c CVS log

Up to [cvs.NetBSD.org] / src / sys / miscfs / kernfs

Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.

Diff for /src/sys/miscfs/kernfs/kernfs_vnops.c between version 1.46 and 1.70

version 1.46, 1996/10/10 22:54:08

version 1.70, 2000/08/03 03:41:18

Line 35

* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

* SUCH DAMAGE.

* @(#)kernfs_vnops.c 8.9 (Berkeley) 6/15/94

* @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95

Line 62

#include <miscfs/genfs/genfs.h>

#include <miscfs/kernfs/kernfs.h>

#include <uvm/uvm_extern.h>

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

#define UIO_MX 32

Line 69

Line 71

#define WRITE_MODE (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)

struct kern_target {

struct kern_target kern_targets[] = {

u_char kt_type;

u_char kt_namlen;

char *kt_name;

void *kt_data;

#define KTT_NULL 1

#define KTT_TIME 5

#define KTT_INT 17

#define KTT_STRING 31

#define KTT_HOSTNAME 47

#define KTT_AVENRUN 53

#define KTT_DEVICE 71

#define KTT_MSGBUF 89

u_char kt_tag;

u_char kt_vtype;

mode_t kt_mode;

} kern_targets[] = {

/* NOTE: The name must be less than UIO_MX-16 chars in length */

#define N(s) sizeof(s)-1, s

/* name data tag type ro/rw */

{ 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 },

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

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

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

#if 0

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

Line 105 struct kern_target {

Line 93 struct kern_target {

{ 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 120 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_nullop

#define kernfs_lock genfs_lock

#define kernfs_unlock genfs_nullop

#define kernfs_unlock genfs_unlock

#define kernfs_bmap genfs_badop

#define kernfs_strategy genfs_badop

int kernfs_print __P((void *));

#define kernfs_islocked genfs_nullop

#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 167 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 */

{ &vop_mmap_desc, kernfs_mmap }, /* mmap */

{ &vop_fsync_desc, kernfs_fsync }, /* fsync */

{ &vop_seek_desc, kernfs_seek }, /* seek */

Line 215 kernfs_xread(kt, off, bufp, len)

Line 209 kernfs_xread(kt, off, bufp, len)

struct timeval tv;

microtime(&tv);

ksprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec);

sprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec);

break;

}

case KTT_INT: {

int *ip = kt->kt_data;

ksprintf(*bufp, "%d\n", *ip);

sprintf(*bufp, "%d\n", *ip);

break;

}

Line 234 kernfs_xread(kt, off, bufp, len)

Line 228 kernfs_xread(kt, off, bufp, len)

}

case KTT_MSGBUF: {

extern struct msgbuf *msgbufp;

long n;

if (off >= MSG_BSIZE)

* deal with cases where the message buffer has

* become corrupted.

if (!msgbufenabled || msgbufp->msg_magic != MSG_MAGIC) {

msgbufenabled = 0;

return (ENXIO);

}

* Note that reads of /kern/msgbuf won't necessarily yield

* consistent results, if the message buffer is modified

* while the read is in progress. The worst that can happen

* is that incorrect data will be read. There's no way

* that this can crash the system unless the values in the

* message buffer header are corrupted, but that'll cause

* the system to die anyway.

if (off >= msgbufp->msg_bufs)

return (0);

n = msgbufp->msg_bufx + off;

if (n >= MSG_BSIZE)

if (n >= msgbufp->msg_bufs)

n -= MSG_BSIZE;

n -= msgbufp->msg_bufs;

len = min(MSG_BSIZE - n, MSG_BSIZE - off);

len = min(msgbufp->msg_bufs - n, msgbufp->msg_bufs - off);

*bufp = msgbufp->msg_bufc + n;

return (len);

}

Line 254 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 262 kernfs_xread(kt, off, bufp, len)

Line 273 kernfs_xread(kt, off, bufp, len)

case KTT_AVENRUN:

averunnable.fscale = FSCALE;

ksprintf(*bufp, "%d %d %d %ld\n",

sprintf(*bufp, "%d %d %d %ld\n",

averunnable.ldavg[0], averunnable.ldavg[1],

averunnable.ldavg[2], averunnable.fscale);

break;

Line 289 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 316 kernfs_lookup(v)

Line 327 kernfs_lookup(v)

struct componentname *cnp = ap->a_cnp;

struct vnode **vpp = ap->a_vpp;

struct vnode *dvp = ap->a_dvp;

char *pname = cnp->cn_nameptr;

const char *pname = cnp->cn_nameptr;

struct kern_target *kt;

struct vnode *fvp;

int error, i;

int error, i, wantpunlock;

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_lookup(%x)\n", ap);

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

kprintf("kernfs_lookup(dp = %x, vpp = %x, cnp = %x)\n", dvp, vpp, ap->a_cnp);

printf("kernfs_lookup(dp = %p, vpp = %p, cnp = %p)\n", dvp, vpp, ap->a_cnp);

kprintf("kernfs_lookup(%s)\n", pname);

printf("kernfs_lookup(%s)\n", pname);

#endif

*vpp = NULLVP;

cnp->cn_flags &= ~PDIRUNLOCK;

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

return (EROFS);

Line 335 kernfs_lookup(v)

Line 347 kernfs_lookup(v)

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

*vpp = dvp;

VREF(dvp);

/*VOP_LOCK(dvp);*/

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);

VOP_LOCK(rootdir);

vn_lock(rootdir, LK_SHARED | LK_RETRY);

return (0);

}

#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;

}

#ifdef KERNFS_DIAGNOSTIC

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

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

#endif

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

Line 364 found:

Line 382 found:

if (kt->kt_tag == KTT_DEVICE) {

dev_t *dp = kt->kt_data;

loop:

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

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

return (ENOENT);

}

*vpp = fvp;

if (vget(fvp, 1))

if (vget(fvp, LK_EXCLUSIVE))

goto loop;

if (wantpunlock) {

VOP_UNLOCK(dvp, 0);

cnp->cn_flags |= PDIRUNLOCK;

}

return (0);

}

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_lookup: allocate new vnode\n");

printf("kernfs_lookup: allocate new vnode\n");

#endif

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

if (error)

if (error) {

return (error);

}

MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP,

M_WAITOK);

VTOKERN(fvp)->kf_kt = kt;

fvp->v_type = kt->kt_vtype;

vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY);

*vpp = fvp;

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_lookup: newvp = %x\n", fvp);

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

#endif

if (wantpunlock) {

VOP_UNLOCK(dvp, 0);

cnp->cn_flags |= PDIRUNLOCK;

}

return (0);

}

Line 402 kernfs_access(v)

Line 431 kernfs_access(v)

struct proc *a_p;

} */ *ap = v;

struct vnode *vp = ap->a_vp;

mode_t fmode =

mode_t mode;

(vp->v_flag & VROOT) ? DIR_MODE : VTOKERN(vp)->kf_kt->kt_mode;

return (vaccess(fmode, (uid_t)0, (gid_t)0, ap->a_mode, ap->a_cred));

if (vp->v_flag & VROOT) {

mode = DIR_MODE;

} else {

struct kern_target *kt = VTOKERN(vp)->kf_kt;

mode = kt->kt_mode;

}

return (vaccess(vp->v_type, mode, (uid_t)0, (gid_t)0, ap->a_mode,

ap->a_cred));

}

int

Line 424 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 442 kernfs_getattr(v)

Line 478 kernfs_getattr(v)

if (vp->v_flag & VROOT) {

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_getattr: stat rootdir\n");

printf("kernfs_getattr: stat rootdir\n");

#endif

vap->va_type = VDIR;

vap->va_mode = DIR_MODE;

Line 453 kernfs_getattr(v)

Line 489 kernfs_getattr(v)

struct kern_target *kt = VTOKERN(vp)->kf_kt;

int nbytes, total;

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_getattr: stat target %s\n", kt->kt_name);

printf("kernfs_getattr: stat target %s\n", kt->kt_name);

#endif

vap->va_type = kt->kt_vtype;

vap->va_mode = kt->kt_mode;

vap->va_nlink = 1;

vap->va_fileid = 3 + (kt - kern_targets);

vap->va_fileid = 1 + (kt - kern_targets);

total = 0;

while (buf = strbuf,

nbytes = kernfs_xread(kt, total, &buf, sizeof(strbuf)))

Line 467 kernfs_getattr(v)

Line 503 kernfs_getattr(v)

}

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_getattr: return error %d\n", error);

printf("kernfs_getattr: return error %d\n", error);

#endif

return (error);

}

Line 509 kernfs_read(v)

Line 545 kernfs_read(v)

kt = VTOKERN(vp)->kf_kt;

#ifdef KERNFS_DIAGNOSTIC

kprintf("kern_read %s\n", kt->kt_name);

printf("kern_read %s\n", kt->kt_name);

#endif

off = uio->uio_offset;

Line 571 kernfs_readdir(v)

Line 607 kernfs_readdir(v)

struct uio *a_uio;

struct ucred *a_cred;

int *a_eofflag;

u_long *a_cookies;

off_t **a_cookies;

int a_ncookies;

int a_*ncookies;

} */ *ap = v;

struct uio *uio = ap->a_uio;

struct dirent d;

struct kern_target *kt;

int i;

off_t i;

int error;

u_long *cookies = ap->a_cookies;

off_t *cookies = NULL;

int ncookies = ap->a_ncookies;

int ncookies = 0, nc = 0;

if (ap->a_vp->v_type != VDIR)

return (ENOTDIR);

Line 592 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));

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

*ap->a_cookies = cookies;

}

for (kt = &kern_targets[i];

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

#ifdef KERNFS_DIAGNOSTIC

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

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

#endif

if (kt->kt_tag == KTT_DEVICE) {

Line 611 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)

break;

if (ncookies-- > 0)

if (cookies) {

*cookies++ = i + 1;

ncookies++;

}

if (ap->a_ncookies) {

if (error) {

free(*ap->a_cookies, M_TEMP);

*ap->a_ncookies = 0;

*ap->a_cookies = NULL;

} else

*ap->a_ncookies = ncookies;

}

uio->uio_offset = i;

Line 630 kernfs_inactive(v)

Line 688 kernfs_inactive(v)

{

struct vop_inactive_args /* {

struct vnode *a_vp;

struct proc *a_p;

} */ *ap = v;

struct vnode *vp = ap->a_vp;

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_inactive(%x)\n", vp);

printf("kernfs_inactive(%p)\n", vp);

#endif

* Clear out the v_type field to avoid

* nasty things happening in vgone().

VOP_UNLOCK(vp, 0);

vp->v_type = VNON;

return (0);

}

Line 654 kernfs_reclaim(v)

Line 714 kernfs_reclaim(v)

struct vnode *vp = ap->a_vp;

#ifdef KERNFS_DIAGNOSTIC

kprintf("kernfs_reclaim(%x)\n", vp);

printf("kernfs_reclaim(%p)\n", vp);

#endif

if (vp->v_data) {

FREE(vp->v_data, M_TEMP);

Line 695 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);

}

Line 710 kernfs_print(v)

Line 773 kernfs_print(v)

void *v;

{

kprintf("tag VT_KERNFS, kernfs vnode\n");

printf("tag VT_KERNFS, kernfs vnode\n");

return (0);

}

CVSweb <webmaster@jp.NetBSD.org>