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

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Diff for /src/sys/miscfs/kernfs/kernfs_vnops.c between version 1.2 and 1.16

version 1.2, 1993/03/25 06:00:24

version 1.16, 1993/12/22 13:14:10

Line 33

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

* SUCH DAMAGE.

* $Id$

* Kernel parameter filesystem

#include "param.h"

#include <sys/param.h>

#include "systm.h"

#include <sys/systm.h>

#include "kernel.h"

#include <sys/kernel.h>

#include "types.h"

#include <sys/types.h>

#include "time.h"

#include <sys/time.h>

#include "proc.h"

#include <sys/proc.h>

#include "file.h"

#include <sys/file.h>

#include "vnode.h"

#include <sys/vnode.h>

#include "stat.h"

#include <sys/stat.h>

#include "mount.h"

#include <sys/mount.h>

#include "namei.h"

#include <sys/namei.h>

#include "buf.h"

#include <sys/buf.h>

#include "miscfs/kernfs/kernfs.h"

#include <ufs/dir.h> /* For readdir() XXX */

#include "../ufs/dir.h" /* For readdir() XXX */

#include <miscfs/kernfs/kernfs.h>

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

#define UIO_MX 32

struct kernfs_target kernfs_targets[] = {

struct kern_target {

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

int kt_tag;

#define KTM_RO 0

#define KTM_RO_MODE (S_IRUSR|S_IRGRP|S_IROTH)

#define KTM_RW 43

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

int kt_rw;

int kt_vtype;

} kern_targets[] = {

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

/* name data tag ro/rw */

DIR_TARGET(".", 0, KTT_NULL, KTM_DIR_PERMS )

{ ".", 0, KTT_NULL, KTM_RO, VDIR },

DIR_TARGET("..", 0, KTT_NULL, KTM_DIR_PERMS )

{ "copyright", copyright, KTT_STRING, KTM_RO, VREG },

REG_TARGET("copyright", copyright, KTT_STRING, KTM_RO_PERMS )

{ "hostname", 0, KTT_HOSTNAME, KTM_RW, VREG },

REG_TARGET("hostname", 0, KTT_HOSTNAME, KTM_RW_PERMS )

{ "hz", &hz, KTT_INT, KTM_RO, VREG },

REG_TARGET("hz", &hz, KTT_INT, KTM_RO_PERMS )

{ "loadavg", 0, KTT_AVENRUN, KTM_RO, VREG },

REG_TARGET("loadavg", 0, KTT_AVENRUN, KTM_RO_PERMS )

{ "physmem", &physmem, KTT_INT, KTM_RO, VREG },

REG_TARGET("physmem", &physmem, KTT_INT, KTM_RO_PERMS )

{ "root", 0, KTT_NULL, KTM_RO, VDIR },

#ifdef KERNFS_HAVE_ROOTDIR

{ "rootdev", 0, KTT_NULL, KTM_RO, VBLK },

DIR_TARGET("root", 0, KTT_NULL, KTM_DIR_PERMS )

{ "time", 0, KTT_TIME, KTM_RO, VREG },

#endif

{ "version", version, KTT_STRING, KTM_RO, VREG },

BLK_TARGET("rootdev", 0, KTT_NULL, KTM_RO_PERMS )

CHR_TARGET("rrootdev", 0, KTT_NULL, KTM_RO_PERMS )

REG_TARGET("time", 0, KTT_TIME, KTM_RO_PERMS )

REG_TARGET("version", version, KTT_STRING, KTM_RO_PERMS )

};

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

static int nkernfs_targets = sizeof(kernfs_targets) / sizeof(kernfs_targets[0]);

static int

kernfs_xread(kt, buf, len, lenp)

struct kern_target *kt;

struct kernfs_target *kt;

char *buf;

int len;

int *lenp;

Line 131 kernfs_xread(kt, buf, len, lenp)

Line 115 kernfs_xread(kt, buf, len, lenp)

char *cp = hostname;

int xlen = hostnamelen;

if (xlen >= len)

if (xlen + 2 > len) /* extra space for null and newline */

return (EINVAL);

sprintf(buf, "%s\n", cp);

bcopy(cp, buf, xlen); /* safer than sprintf */

buf[xlen] = '\n';

buf[xlen+1] = '\0';

break;

}

case KTT_AVENRUN:

sprintf(buf, "%d %d %d %d\n",

averunnable[0],

averunnable.ldavg[0],

averunnable[1],

averunnable.ldavg[1],

averunnable[2],

averunnable.ldavg[2],

FSCALE);

break;

Line 156 kernfs_xread(kt, buf, len, lenp)

Line 142 kernfs_xread(kt, buf, len, lenp)

static int

kernfs_xwrite(kt, buf, len)

struct kern_target *kt;

struct kernfs_target *kt;

char *buf;

int len;

{

Line 165 kernfs_xwrite(kt, buf, len)

Line 151 kernfs_xwrite(kt, buf, len)

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

--len;

bcopy(buf, hostname, len);

hostnamelen = len - 1;

/* kernfs_write set buf[value_passed_as_len] = \0.

* therefore, buf len (hostnamelen) = len.

hostnamelen = len;

hostname[hostnamelen] = '\0'; /* null end of string. */

return (0);

}

Line 198 kernfs_lookup(dvp, ndp, p)

Line 188 kernfs_lookup(dvp, ndp, p)

/*VOP_LOCK(dvp);*/

return (0);

}

#ifdef KERNFS_HAVE_ROOTDIR

if (ndp->ni_namelen == 4 && bcmp(pname, "root", 4) == 0) {

ndp->ni_dvp = rootdir;

ndp->ni_dvp = dvp;

ndp->ni_vp = rootdir;

VREF(rootdir);

VOP_LOCK(rootdir);

return (0);

}

#endif

* /kern/rootdev is the root device

if (ndp->ni_namelen == 7 && bcmp(pname, "rootdev", 7) == 0) {

if (vfinddev(rootdev, VBLK, &fvp))

if (!rootvp) {

return (ENXIO);

error = ENOENT;

goto bad;

}

ndp->ni_dvp = dvp;

ndp->ni_vp = fvp;

ndp->ni_vp = rootvp;

VREF(fvp);

VREF(rootvp);

VOP_LOCK(fvp);

VOP_LOCK(rootvp);

return (0);

}

for (i = 0; i < nkern_targets; i++) {

struct kern_target *kt = &kern_targets[i];

* /kern/rrootdev is the raw root device

if (ndp->ni_namelen == 8 && bcmp(pname, "rrootdev", 7) == 0) {

if (!rrootdevvp) {

error = ENOENT;

goto bad;

}

ndp->ni_dvp = dvp;

ndp->ni_vp = rrootdevvp;

VREF(rrootdevvp);

VOP_LOCK(rrootdevvp);

return (0);

}

for (i = 0; i < nkernfs_targets; i++) {

struct kernfs_target *kt = &kernfs_targets[i];

if (ndp->ni_namelen == strlen(kt->kt_name) &&

bcmp(kt->kt_name, pname, ndp->ni_namelen) == 0) {

error = 0;

Line 240 kernfs_lookup(dvp, ndp, p)

Line 248 kernfs_lookup(dvp, ndp, p)

#ifdef KERNFS_DIAGNOSTIC

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

#endif

error = getnewvnode(VT_UFS, dvp->v_mount, &kernfs_vnodeops, &fvp);

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

if (error)

goto bad;

VTOKERN(fvp)->kf_kt = &kern_targets[i];

VTOKERN(fvp)->kf_kt = &kernfs_targets[i];

fvp->v_type = VTOKERN(fvp)->kf_kt->kt_vtype;

ndp->ni_dvp = dvp;

ndp->ni_vp = fvp;

Line 267 kernfs_open(vp, mode, cred, p)

Line 275 kernfs_open(vp, mode, cred, p)

struct ucred *cred;

struct proc *p;

{

int error;

/* if access succeeded, this always does, too */

struct filedesc *fdp;

struct file *fp;

int dfd;

int fd;

#ifdef KERNFS_DIAGNOSTIC

return (0);

printf("kernfs_open\n");

}

#endif

* Check mode permission on target pointer. Mode is READ, WRITE or EXEC.

* The mode is shifted to select the owner/group/other fields. The

* super user is granted all permissions.

kernfs_access(vp, mode, cred, p)

struct vnode *vp;

struct ucred *cred;

struct proc *p;

{

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

int i, error;

#ifdef KERN_DIAGNOSTIC

if (!VOP_ISLOCKED(vp)) {

vprint("kernfs_access: not locked", vp);

panic("kernfs_access: not locked");

}

#endif

* Can always open the root (modulo perms)

* If you're the super-user, you always get access.

if (vp->v_flag & VROOT)

if (cred->cr_uid == 0)

return (0);

#ifdef KERNFS_DIAGNOSTIC

* Access check is based on only one of owner, group, public.

printf("kernfs_open, mode = %x, file = %s\n",

* If not owner, then check group. If not a member of the

mode, VTOKERN(vp)->kf_kt->kt_name);

* group, then check public access.

#endif

if (cred->cr_uid != /* kt->kt_uid XXX */ 0) {

if ((mode & FWRITE) && VTOKERN(vp)->kf_kt->kt_rw != KTM_RW)

mode >>= 3;

return (EBADF);

gp = cred->cr_groups;

for (i = 0; i < cred->cr_ngroups; i++, gp++)

return (0);

if (/* kt->kt_gid XXX */ 0 == *gp)

goto found;

mode >>= 3;

found:

;

}

if ((kt->kt_perms & mode) == mode)

return (0);

return (EACCES);

}

kernfs_getattr(vp, vap, cred, p)

Line 302 kernfs_getattr(vp, vap, cred, p)

Line 334 kernfs_getattr(vp, vap, cred, p)

{

int error = 0;

char strbuf[KSTRING];

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

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

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

vattr_null(vap);

vap->va_uid = 0;

vap->va_uid = kt->kt_uid;

vap->va_gid = 0;

vap->va_gid = kt->kt_gid;

vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];

/* vap->va_qsize = 0; */

vap->va_blocksize = DEV_BSIZE;

Line 319 kernfs_getattr(vp, vap, cred, p)

Line 351 kernfs_getattr(vp, vap, cred, p)

vap->va_rdev = 0;

/* vap->va_qbytes = 0; */

vap->va_bytes = 0;

vap->va_type = kt->kt_vtype;

vap->va_mode = kt->kt_perms;

if (vp->v_flag & VROOT) {

#ifdef KERNFS_DIAGNOSTIC

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

#endif

vap->va_type = VDIR;

vap->va_mode = KTM_DIR_MODE;

vap->va_nlink = 2;

vap->va_fileid = 2;

vap->va_size = DEV_BSIZE;

Line 333 kernfs_getattr(vp, vap, cred, p)

Line 365 kernfs_getattr(vp, vap, cred, p)

#ifdef KERNFS_DIAGNOSTIC

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

#endif

vap->va_type = kt->kt_vtype;

vap->va_mode = (kt->kt_rw ? KTM_RW_MODE : KTM_RO_MODE);

vap->va_nlink = 1;

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

vap->va_fileid = 3 + (kt - kernfs_targets) / sizeof(*kt);

error = kernfs_xread(kt, strbuf, sizeof(strbuf), &vap->va_size);

}

Line 347 kernfs_getattr(vp, vap, cred, p)

Line 377 kernfs_getattr(vp, vap, cred, p)

return (error);

}

* Change the mode on a file.

kernfs_chmod1(vp, mode, p)

struct proc *p;

{

int error;

if ((mode & kt->kt_maxperms) != mode) /* can't set ro var to rw */

return (EPERM);

if (cred->cr_uid != kt->kt_uid &&

(error = suser(cred, &p->p_acflag)))

return (error);

if (cred->cr_uid) {

if (vp->v_type != VDIR && (mode & S_ISVTX))

return (EFTYPE);

if (!groupmember(kt->kt_gid, cred) && (mode & S_ISGID))

return (EPERM);

}

kt->kt_perms &= ~07777;

kt->kt_perms |= mode & 07777;

/* ip->i_flag |= ICHG;*/

return (0);

}

* Perform chown operation on kernfs_target kt

kernfs_chown1(vp, uid, gid, p)

uid_t uid;

gid_t gid;

struct proc *p;

{

uid_t ouid;

gid_t ogid;

int error = 0;

if (uid == (u_short)VNOVAL)

uid = kt->kt_uid;

if (gid == (u_short)VNOVAL)

gid = kt->kt_gid;

* If we don't own the file, are trying to change the owner

* of the file, or are not a member of the target group,

* the caller must be superuser or the call fails.

if ((cred->cr_uid != kt->kt_uid || uid != kt->kt_uid ||

!groupmember((gid_t)gid, cred)) &&

(error = suser(cred, &p->p_acflag)))

return (error);

ouid = kt->kt_uid;

ogid = kt->kt_gid;

kt->kt_uid = uid;

kt->kt_gid = gid;

/* if (ouid != uid || ogid != gid)

ip->i_flag |= ICHG;*/

if (ouid != uid && cred->cr_uid != 0)

kt->kt_perms &= ~S_ISUID;

if (ogid != gid && cred->cr_uid != 0)

kt->kt_perms &= ~S_ISGID;

return (0);

}

* Set attribute vnode op. called from several syscalls

kernfs_setattr(vp, vap, cred, p)

struct vnode *vp;

struct vattr *vap;

struct ucred *cred;

struct proc *p;

{

int error = 0;

* Silently ignore attribute changes.

* Check for unsetable attributes.

* This allows for open with truncate to have no

* effect until some data is written. I want to

* do it this way because all writes are atomic.

return (0);

if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||

(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||

(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||

((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {

return (EINVAL);

}

* Go through the fields and update iff not VNOVAL.

if (vap->va_uid != (u_short)VNOVAL || vap->va_gid != (u_short)VNOVAL)

if (error = kernfs_chown1(vp, vap->va_uid, vap->va_gid, p))

return (error);

if (vap->va_size != VNOVAL) {

if (vp->v_type == VDIR)

return (EISDIR);

/* else just nod and smile... */

}

if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {

/* if (cred->cr_uid != ip->i_uid &&

(error = suser(cred, &p->p_acflag)))

return (error);

if (vap->va_atime.tv_sec != VNOVAL)

ip->i_flag |= IACC;

if (vap->va_mtime.tv_sec != VNOVAL)

ip->i_flag |= IUPD;

ip->i_flag |= ICHG;

if (error = iupdat(ip, &vap->va_atime, &vap->va_mtime, 1))

return (error);

}

if (vap->va_mode != (u_short)VNOVAL)

error = kernfs_chmod1(vp, (int)vap->va_mode, p);

if (vap->va_flags != VNOVAL) {

/* if (cred->cr_uid != ip->i_uid &&

(error = suser(cred, &p->p_acflag)))

return (error);

if (cred->cr_uid == 0) {

ip->i_flags = vap->va_flags;

} else {

ip->i_flags &= 0xffff0000;

ip->i_flags |= (vap->va_flags & 0xffff);

}

ip->i_flag |= ICHG;

}

return (error);

}

static int

Line 370 kernfs_read(vp, uio, ioflag, cred)

Line 520 kernfs_read(vp, uio, ioflag, cred)

int ioflag;

struct ucred *cred;

{

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

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

char strbuf[KSTRING];

int off = uio->uio_offset;

int len = 0;

Line 395 kernfs_write(vp, uio, ioflag, cred)

Line 545 kernfs_write(vp, uio, ioflag, cred)

int ioflag;

struct ucred *cred;

{

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

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

char strbuf[KSTRING];

int len = uio->uio_resid;

char *cp = strbuf;

Line 417 kernfs_write(vp, uio, ioflag, cred)

Line 567 kernfs_write(vp, uio, ioflag, cred)

return (kernfs_xwrite(kt, strbuf, xlen));

}

kernfs_readdir(vp, uio, cred, eofflagp)

kernfs_readdir(vp, uio, cred, eofflagp, cookies, ncookies)

struct vnode *vp;

struct uio *uio;

struct ucred *cred;

int *eofflagp;

u_int *cookies;

int ncookies;

{

struct filedesc *fdp;

int i;

Line 429 kernfs_readdir(vp, uio, cred, eofflagp)

Line 581 kernfs_readdir(vp, uio, cred, eofflagp)

i = uio->uio_offset / UIO_MX;

error = 0;

while (uio->uio_resid > 0) {

while (uio->uio_resid > 0 && (!cookies || ncookies > 0)) {

#ifdef KERNFS_DIAGNOSTIC

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

#endif

if (i >= nkern_targets) {

if (i >= nkernfs_targets) {

*eofflagp = 1;

break;

}

{

struct direct d;

struct direct *dp = &d;

struct kern_target *kt = &kern_targets[i];

struct kernfs_target *kt = &kernfs_targets[i];

bzero((caddr_t) dp, UIO_MX);

Line 462 kernfs_readdir(vp, uio, cred, eofflagp)

Line 614 kernfs_readdir(vp, uio, cred, eofflagp)

error = uiomove((caddr_t) dp, UIO_MX, uio);

if (error)

break;

if (cookies) {

*cookies = (i + 1) * UIO_MX;

ncookies--;

}

i++;

}

Line 490 kernfs_inactive(vp, p)

Line 646 kernfs_inactive(vp, p)

* Print out the contents of a kernfs vnode.

/* ARGSUSED */

int

kernfs_print(vp)

struct vnode *vp;

{

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

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

return (0);

}

Line 535 kernfs_nullop()

Line 693 kernfs_nullop()

int fflag, \

struct ucred *cred, \

struct proc *p))) nullop)

#define kernfs_access ((int (*) __P(( \

struct vnode *vp, \

int mode, \

struct ucred *cred, \

struct proc *p))) nullop)

#define kernfs_ioctl ((int (*) __P(( \

struct vnode *vp, \

int command, \

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