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

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Diff for /src/sys/miscfs/kernfs/kernfs_vnops.c between version 1.41 and 1.58

version 1.41, 1996/02/09 22:40:24

version 1.58, 1998/03/08 14:04:14

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

* Kernel parameter filesystem (/kern)

#if defined(_KERNEL) && !defined(_LKM)

#include "opt_uvm.h"

#endif

#include <sys/param.h>

#include <sys/systm.h>

#include <sys/kernel.h>

Line 58

Line 62

#include <sys/buf.h>

#include <sys/dirent.h>

#include <sys/msgbuf.h>

#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 67

Line 78

#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 */

Line 95 struct kern_target {

Line 90 struct kern_target {

{ 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 108 struct kern_target {

Line 107 struct kern_target {

};

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

int kernfs_enotsupp __P((void *));

int kernfs_badop __P((void *));

int kernfs_nullop __P((void *));

int kernfs_lookup __P((void *));

#define kernfs_create kernfs_enotsupp

#define kernfs_create genfs_eopnotsupp

#define kernfs_mknod kernfs_enotsupp

#define kernfs_mknod genfs_eopnotsupp

int kernfs_open __P((void *));

#define kernfs_open genfs_nullop

#define kernfs_close nullop

#define kernfs_close genfs_nullop

int kernfs_access __P((void *));

int kernfs_getattr __P((void *));

int kernfs_setattr __P((void *));

int kernfs_read __P((void *));

int kernfs_write __P((void *));

#define kernfs_ioctl kernfs_enotsupp

#define kernfs_ioctl genfs_eopnotsupp

#define kernfs_select kernfs_enotsupp

#define kernfs_poll genfs_poll

#define kernfs_mmap kernfs_enotsupp

#define kernfs_revoke genfs_revoke

#define kernfs_fsync nullop

#define kernfs_mmap genfs_eopnotsupp

#define kernfs_seek nullop

#define kernfs_fsync genfs_nullop

#define kernfs_remove kernfs_enotsupp

#define kernfs_seek genfs_nullop

#define kernfs_remove genfs_eopnotsupp

int kernfs_link __P((void *));

#define kernfs_rename kernfs_enotsupp

#define kernfs_rename genfs_eopnotsupp

#define kernfs_mkdir kernfs_enotsupp

#define kernfs_mkdir genfs_eopnotsupp

#define kernfs_rmdir kernfs_enotsupp

#define kernfs_rmdir genfs_eopnotsupp

int kernfs_symlink __P((void *));

int kernfs_readdir __P((void *));

#define kernfs_readlink kernfs_enotsupp

#define kernfs_readlink genfs_eopnotsupp

int kernfs_abortop __P((void *));

#define kernfs_abortop genfs_abortop

int kernfs_inactive __P((void *));

int kernfs_reclaim __P((void *));

#define kernfs_lock nullop

#define kernfs_lock genfs_nolock

#define kernfs_unlock nullop

#define kernfs_unlock genfs_nounlock

#define kernfs_bmap kernfs_badop

#define kernfs_bmap genfs_badop

#define kernfs_strategy kernfs_badop

#define kernfs_strategy genfs_badop

int kernfs_print __P((void *));

#define kernfs_islocked nullop

#define kernfs_islocked genfs_noislocked

int kernfs_pathconf __P((void *));

#define kernfs_advlock kernfs_enotsupp

#define kernfs_advlock genfs_eopnotsupp

#define kernfs_blkatoff kernfs_enotsupp

#define kernfs_blkatoff genfs_eopnotsupp

#define kernfs_valloc kernfs_enotsupp

#define kernfs_valloc genfs_eopnotsupp

int kernfs_vfree __P((void *));

#define kernfs_vfree genfs_nullop

#define kernfs_truncate kernfs_enotsupp

#define kernfs_truncate genfs_eopnotsupp

#define kernfs_update kernfs_enotsupp

#define kernfs_update genfs_nullop

#define kernfs_bwrite kernfs_enotsupp

#define kernfs_bwrite genfs_eopnotsupp

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

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

Line 158 int kernfs_xwrite __P((struct kern_targe

Line 155 int kernfs_xwrite __P((struct kern_targe

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

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 */

{ &vop_mknod_desc, kernfs_mknod }, /* mknod */

{ &vop_open_desc, kernfs_open }, /* open */

{ &vop_close_desc, kernfs_close }, /* close */

{ &vop_access_desc, kernfs_access }, /* access */

{ &vop_getattr_desc, kernfs_getattr }, /* getattr */

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

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

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

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

{ &vop_select_desc, kernfs_select }, /* select */

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

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

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

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

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

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

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

{ &vop_remove_desc, kernfs_remove }, /* remove */

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

{ &vop_link_desc, kernfs_link }, /* link */

{ &vop_remove_desc, kernfs_remove }, /* remove */

{ &vop_rename_desc, kernfs_rename }, /* rename */

{ &vop_link_desc, kernfs_link }, /* link */

{ &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */

{ &vop_rename_desc, kernfs_rename }, /* rename */

{ &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */

{ &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */

{ &vop_symlink_desc, kernfs_symlink }, /* symlink */

{ &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */

{ &vop_readdir_desc, kernfs_readdir }, /* readdir */

{ &vop_symlink_desc, kernfs_symlink }, /* symlink */

{ &vop_readlink_desc, kernfs_readlink },/* readlink */

{ &vop_readdir_desc, kernfs_readdir }, /* readdir */

{ &vop_abortop_desc, kernfs_abortop }, /* abortop */

{ &vop_readlink_desc, kernfs_readlink }, /* readlink */

{ &vop_inactive_desc, kernfs_inactive },/* inactive */

{ &vop_abortop_desc, kernfs_abortop }, /* abortop */

{ &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */

{ &vop_inactive_desc, kernfs_inactive }, /* inactive */

{ &vop_lock_desc, kernfs_lock }, /* lock */

{ &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */

{ &vop_unlock_desc, kernfs_unlock }, /* unlock */

{ &vop_lock_desc, kernfs_lock }, /* lock */

{ &vop_bmap_desc, kernfs_bmap }, /* bmap */

{ &vop_unlock_desc, kernfs_unlock }, /* unlock */

{ &vop_strategy_desc, kernfs_strategy },/* strategy */

{ &vop_bmap_desc, kernfs_bmap }, /* bmap */

{ &vop_print_desc, kernfs_print }, /* print */

{ &vop_strategy_desc, kernfs_strategy }, /* strategy */

{ &vop_islocked_desc, kernfs_islocked },/* islocked */

{ &vop_print_desc, kernfs_print }, /* print */

{ &vop_pathconf_desc, kernfs_pathconf },/* pathconf */

{ &vop_islocked_desc, kernfs_islocked }, /* islocked */

{ &vop_advlock_desc, kernfs_advlock }, /* advlock */

{ &vop_pathconf_desc, kernfs_pathconf }, /* pathconf */

{ &vop_blkatoff_desc, kernfs_blkatoff },/* blkatoff */

{ &vop_advlock_desc, kernfs_advlock }, /* advlock */

{ &vop_valloc_desc, kernfs_valloc }, /* valloc */

{ &vop_blkatoff_desc, kernfs_blkatoff }, /* blkatoff */

{ &vop_vfree_desc, kernfs_vfree }, /* vfree */

{ &vop_valloc_desc, kernfs_valloc }, /* valloc */

{ &vop_truncate_desc, kernfs_truncate },/* truncate */

{ &vop_vfree_desc, kernfs_vfree }, /* vfree */

{ &vop_update_desc, kernfs_update }, /* update */

{ &vop_truncate_desc, kernfs_truncate }, /* truncate */

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

{ &vop_update_desc, kernfs_update }, /* update */

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

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

};

struct vnodeopv_desc kernfs_vnodeop_opv_desc =

Line 216 kernfs_xread(kt, off, bufp, len)

Line 214 kernfs_xread(kt, off, bufp, len)

struct timeval tv;

microtime(&tv);

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

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

break;

}

Line 235 kernfs_xread(kt, off, bufp, len)

Line 233 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 263 kernfs_xread(kt, off, bufp, len)

Line 278 kernfs_xread(kt, off, bufp, len)

case KTT_AVENRUN:

averunnable.fscale = FSCALE;

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

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

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

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

break;

Line 317 kernfs_lookup(v)

Line 332 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;

#ifdef KERNFS_DIAGNOSTIC

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

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

printf("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);

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

#endif

Line 333 kernfs_lookup(v)

Line 348 kernfs_lookup(v)

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);

/*VOP_LOCK(dvp);*/

vn_lock(dvp, LK_SHARED | LK_RETRY);

return (0);

}

Line 344 kernfs_lookup(v)

Line 360 kernfs_lookup(v)

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

*vpp = rootdir;

VREF(rootdir);

VOP_LOCK(rootdir);

vn_lock(rootdir, LK_SHARED | LK_RETRY);

return (0);

}

#endif

Line 359 kernfs_lookup(v)

Line 375 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:

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)) {

vn_lock(dvp, LK_SHARED | LK_RETRY);

return (ENOENT);

}

*vpp = fvp;

if (vget(fvp, 1))

if (vget(fvp, LK_EXCLUSIVE))

goto loop;

return (0);

}

Line 377 found:

Line 396 found:

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

#endif

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

if (error)

if (error) {

vn_lock(dvp, LK_SHARED | LK_RETRY);

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_SHARED | LK_RETRY);

*vpp = fvp;

#ifdef KERNFS_DIAGNOSTIC

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

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

#endif

return (0);

}

/*ARGSUSED*/

int

kernfs_open(v)

void *v;

{

/* Only need to check access permissions. */

return (0);

}

int

kernfs_access(v)

void *v;

Line 412 kernfs_access(v)

Line 425 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;

if (vp->v_flag & VROOT) {

mode = DIR_MODE;

} else {

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

mode = kt->kt_mode;

}

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

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

ap->a_cred));

}

int

Line 468 kernfs_getattr(v)

Line 488 kernfs_getattr(v)

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 581 kernfs_readdir(v)

Line 601 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;

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 605 kernfs_readdir(v)

Line 625 kernfs_readdir(v)

bzero((caddr_t)&d, 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,

M_WAITOK);

*ap->a_cookies = cookies;

}

for (kt = &kern_targets[i];

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

#ifdef KERNFS_DIAGNOSTIC

Line 626 kernfs_readdir(v)

Line 654 kernfs_readdir(v)

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 640 kernfs_inactive(v)

Line 679 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

printf("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 664 kernfs_reclaim(v)

Line 705 kernfs_reclaim(v)

struct vnode *vp = ap->a_vp;

#ifdef KERNFS_DIAGNOSTIC

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

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

#endif

if (vp->v_data) {

FREE(vp->v_data, M_TEMP);

Line 724 kernfs_print(v)

Line 765 kernfs_print(v)

return (0);

}

/*ARGSUSED*/

int

kernfs_vfree(v)

void *v;

{

return (0);

}

int

kernfs_link(v)

void *v;

Line 764 kernfs_symlink(v)

Line 796 kernfs_symlink(v)

vput(ap->a_dvp);

return (EROFS);

}

int

kernfs_abortop(v)

void *v;

{

struct vop_abortop_args /* {

struct vnode *a_dvp;

struct componentname *a_cnp;

} */ *ap = v;

if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)

FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);

return (0);

}

* /dev/fd vnode unsupported operation

/*ARGSUSED*/

int

kernfs_enotsupp(v)

void *v;

{

return (EOPNOTSUPP);

}

* /dev/fd "should never get here" operation

/*ARGSUSED*/

int

kernfs_badop(v)

void *v;

{

panic("kernfs: bad op");

return 0;

}

* kernfs vnode null operation

/*ARGSUSED*/

int

kernfs_nullop(v)

void *v;

{

return (0);

}

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