878 lines
23 KiB
C
878 lines
23 KiB
C
/* This file contains the procedures for creating, opening, closing, and
|
|
* seeking on files.
|
|
*
|
|
* The entry points into this file are
|
|
* do_creat: perform the CREAT system call
|
|
* do_open: perform the OPEN system call
|
|
* do_mknod: perform the MKNOD system call
|
|
* do_mkdir: perform the MKDIR system call
|
|
* do_close: perform the CLOSE system call
|
|
* do_lseek: perform the LSEEK system call
|
|
*
|
|
* Changes for VFS:
|
|
* Jul 2006 (Balazs Gerofi)
|
|
*/
|
|
|
|
#include "fs.h"
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <minix/callnr.h>
|
|
#include <minix/com.h>
|
|
#include <minix/u64.h>
|
|
#include "file.h"
|
|
#include "fproc.h"
|
|
#include "lock.h"
|
|
#include "param.h"
|
|
#include <dirent.h>
|
|
#include <assert.h>
|
|
|
|
#include <minix/vfsif.h>
|
|
#include "vnode.h"
|
|
#include "vmnt.h"
|
|
|
|
#define offset_lo m2_l1
|
|
#define offset_high m2_l2
|
|
|
|
FORWARD _PROTOTYPE( int common_open, (int oflags, mode_t omode) );
|
|
FORWARD _PROTOTYPE( int create_open, (_mnx_Mode_t omode, int excl,
|
|
struct vnode **vpp, int *created) );
|
|
FORWARD _PROTOTYPE( int exists_open, (struct vnode *vp, _mnx_Mode_t bits,
|
|
int oflags));
|
|
FORWARD _PROTOTYPE( int pipe_open, (struct vnode *vp,mode_t bits,int oflags));
|
|
|
|
/*===========================================================================*
|
|
* do_creat *
|
|
*===========================================================================*/
|
|
PUBLIC int do_creat()
|
|
{
|
|
/* Perform the creat(name, mode) system call. */
|
|
int r;
|
|
|
|
if (fetch_name(m_in.name, m_in.name_length, M3) != OK) return(err_code);
|
|
r = common_open(O_WRONLY | O_CREAT | O_TRUNC, (mode_t) m_in.mode);
|
|
return(r);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_open *
|
|
*===========================================================================*/
|
|
PUBLIC int do_open()
|
|
{
|
|
/* Perform the open(name, flags,...) system call. */
|
|
int create_mode = 0; /* is really mode_t but this gives problems */
|
|
int r;
|
|
|
|
/* If O_CREAT is set, open has three parameters, otherwise two. */
|
|
if (m_in.mode & O_CREAT) {
|
|
create_mode = m_in.c_mode;
|
|
r = fetch_name(m_in.c_name, m_in.name1_length, M1);
|
|
} else {
|
|
r = fetch_name(m_in.name, m_in.name_length, M3);
|
|
}
|
|
|
|
if (r != OK) {
|
|
return(err_code); /* name was bad */
|
|
}
|
|
r = common_open(m_in.mode, create_mode);
|
|
return(r);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* common_open *
|
|
*===========================================================================*/
|
|
PRIVATE int common_open(register int oflags, mode_t omode)
|
|
{
|
|
/* Common code from do_creat and do_open. */
|
|
int b, m, r, created, found;
|
|
mode_t bits;
|
|
struct filp *fil_ptr, *filp2;
|
|
struct vnode *vp;
|
|
struct vmnt *vmp;
|
|
struct dmap *dp;
|
|
|
|
/* Remap the bottom two bits of oflags. */
|
|
m = oflags & O_ACCMODE;
|
|
switch(m) {
|
|
case O_RDONLY: bits = R_BIT; break;
|
|
case O_WRONLY: bits = W_BIT; break;
|
|
case O_RDWR: bits = R_BIT | W_BIT; break;
|
|
default: return EINVAL;
|
|
}
|
|
|
|
/* See if file descriptor and filp slots are available. */
|
|
if ((r = get_fd(0, bits, &m_in.fd, &fil_ptr)) != OK) return(r);
|
|
|
|
/* If O_CREATE, set umask */
|
|
if (oflags & O_CREAT) {
|
|
omode = I_REGULAR | (omode & ALL_MODES & fp->fp_umask);
|
|
}
|
|
|
|
if (oflags & O_CREAT)
|
|
r= create_open(omode, !!(oflags & O_EXCL), &vp, &created);
|
|
else
|
|
{
|
|
#if 0
|
|
printf("vfs:common_open: path '%s'\n", user_fullpath);
|
|
#endif
|
|
created= FALSE;
|
|
r= lookup_vp(0 /*flags*/, 0 /*!use_realuid*/, &vp);
|
|
}
|
|
if (r != OK)
|
|
return r;
|
|
|
|
if (!created)
|
|
{
|
|
r= exists_open(vp, bits, oflags);
|
|
if (r != OK)
|
|
{
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
/* Claim the file descriptor and filp slot and fill them in. */
|
|
fp->fp_filp[m_in.fd] = fil_ptr;
|
|
FD_SET(m_in.fd, &fp->fp_filp_inuse);
|
|
fil_ptr->filp_count = 1;
|
|
fil_ptr->filp_flags = oflags;
|
|
fil_ptr->filp_vno = vp;
|
|
|
|
switch (vp->v_mode & I_TYPE) {
|
|
case I_CHAR_SPECIAL:
|
|
/* Invoke the driver for special processing. */
|
|
r = dev_open(vp->v_sdev, who_e, bits | (oflags & ~O_ACCMODE));
|
|
if (r == SUSPEND)
|
|
suspend(XDOPEN); /* suspend caller */
|
|
break;
|
|
|
|
case I_BLOCK_SPECIAL:
|
|
/* Invoke the driver for special processing. */
|
|
r = dev_open(vp->v_sdev, who_e, bits | (oflags & ~O_ACCMODE));
|
|
if (r != OK)
|
|
break;
|
|
|
|
/* Check whether the device is mounted or not */
|
|
found = 0;
|
|
for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp) {
|
|
if (vmp->m_dev == vp->v_sdev) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Who is going to be responsible for this device? */
|
|
if (found) {
|
|
vp->v_bfs_e = vmp->m_fs_e;
|
|
}
|
|
else { /* To be handled in the root FS proc if not mounted */
|
|
vp->v_bfs_e = ROOT_FS_E;
|
|
}
|
|
|
|
/* Get the driver endpoint of the block spec device */
|
|
dp = &dmap[(vp->v_sdev >> MAJOR) & BYTE];
|
|
if (dp->dmap_driver == NONE) {
|
|
printf("VFSblock_spec_open: driver not found for device %d\n",
|
|
vp->v_sdev);
|
|
r = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Send the driver endpoint (even if it is known already...) */
|
|
if ((r = req_newdriver(vp->v_bfs_e, vp->v_sdev, dp->dmap_driver))
|
|
!= OK) {
|
|
printf("VFSblock_spec_open: error sending driver endpoint\n");
|
|
}
|
|
break;
|
|
|
|
case I_NAMED_PIPE:
|
|
vp->v_pipe = I_PIPE;
|
|
oflags |= O_APPEND; /* force append mode */
|
|
fil_ptr->filp_flags = oflags;
|
|
r = pipe_open(vp, bits, oflags);
|
|
if (r != ENXIO) {
|
|
/* See if someone else is doing a rd or wt on
|
|
* the FIFO. If so, use its filp entry so the
|
|
* file position will be automatically shared.
|
|
*/
|
|
b = (bits & R_BIT ? R_BIT : W_BIT);
|
|
assert(fil_ptr->filp_count == 1);
|
|
fil_ptr->filp_count = 0; /* don't find self */
|
|
if ((filp2 = find_filp(vp, b)) != NIL_FILP) {
|
|
/* Co-reader or writer found. Use it.*/
|
|
fp->fp_filp[m_in.fd] = filp2;
|
|
filp2->filp_count++;
|
|
filp2->filp_vno = vp;
|
|
filp2->filp_flags = oflags;
|
|
|
|
/* v_count was incremented after the vnode has
|
|
* been found, i_count was incremented incorrectly
|
|
* by eatpath in FS, not knowing that we were going to
|
|
* use an existing filp entry. Correct this error.
|
|
*/
|
|
put_vnode(vp);
|
|
} else {
|
|
/* Nobody else found. Claim filp. */
|
|
fil_ptr->filp_count = 1;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* If error, release inode. */
|
|
if (r != OK) {
|
|
if (r == SUSPEND) return(r); /* Oops, just suspended */
|
|
fp->fp_filp[m_in.fd] = NIL_FILP;
|
|
FD_CLR(m_in.fd, &fp->fp_filp_inuse);
|
|
fil_ptr->filp_count= 0;
|
|
put_vnode(vp);
|
|
fil_ptr->filp_vno = NIL_VNODE;
|
|
return(r);
|
|
}
|
|
|
|
return(m_in.fd);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* create_open *
|
|
*===========================================================================*/
|
|
PRIVATE int create_open(omode, excl, vpp, created)
|
|
mode_t omode;
|
|
int excl;
|
|
struct vnode **vpp;
|
|
int *created;
|
|
{
|
|
int i, r, r1;
|
|
size_t len;
|
|
struct vnode *vp, *dir_vp, *new_vp, *start_vp;
|
|
|
|
struct node_details res;
|
|
char lastc[PATH_MAX+1];
|
|
|
|
if(!fp->fp_rd || !fp->fp_wd) {
|
|
printf("VFS: %d: no rd/wd\n", fp->fp_endpoint);
|
|
return ENOENT;
|
|
}
|
|
|
|
start_vp = (user_fullpath[0] == '/' ? fp->fp_rd : fp->fp_wd);
|
|
dup_vnode(start_vp);
|
|
|
|
for (i= 0; i<SYMLOOP_MAX; i++)
|
|
{
|
|
#if 0
|
|
printf("vfs:create_open: path #%d '%s'\n", i+1, user_fullpath);
|
|
#endif
|
|
r= lookup_lastdir_rel(start_vp, 0 /*!use_realuid*/, &dir_vp);
|
|
put_vnode(start_vp);
|
|
if (r != OK)
|
|
return r;
|
|
|
|
/* Save the last component of the path */
|
|
len= strlen(user_fullpath)+1;
|
|
if (len > sizeof(lastc))
|
|
{
|
|
put_vnode(dir_vp);
|
|
return ENAMETOOLONG;
|
|
}
|
|
memcpy(lastc, user_fullpath, len);
|
|
|
|
/* Get a free vnode */
|
|
new_vp = get_free_vnode(__FILE__, __LINE__);
|
|
if (new_vp == NIL_VNODE) {
|
|
put_vnode(dir_vp);
|
|
printf("vfs:create_open: no free vnode available\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
r= forbidden(dir_vp, W_BIT|X_BIT, 0 /*!use_realuid*/);
|
|
if (r == OK)
|
|
{
|
|
/* Try to create the file */
|
|
r= req_create(dir_vp->v_fs_e, dir_vp->v_inode_nr,
|
|
omode, fp->fp_effuid, fp->fp_effgid, lastc,
|
|
&res);
|
|
}
|
|
|
|
if (r != EEXIST && r != EACCES)
|
|
{
|
|
put_vnode(dir_vp);
|
|
|
|
if (r != OK)
|
|
return r;
|
|
|
|
/* Check whether vnode is already in use or not */
|
|
vp = find_vnode(res.fs_e, res.inode_nr);
|
|
if (vp != NIL_VNODE) {
|
|
vp->v_ref_count++;
|
|
vp->v_fs_count++;
|
|
}
|
|
else
|
|
{
|
|
vp= new_vp;
|
|
|
|
/* Fill in the free vnode's fields */
|
|
vp->v_fs_e = res.fs_e;
|
|
vp->v_inode_nr = res.inode_nr;
|
|
vp->v_mode = res.fmode;
|
|
vp->v_size = res.fsize;
|
|
vp->v_uid = res.uid;
|
|
vp->v_gid = res.gid;
|
|
vp->v_sdev = res.dev;
|
|
|
|
vp->v_vmnt = dir_vp->v_vmnt;
|
|
vp->v_dev = vp->v_vmnt->m_dev;
|
|
vp->v_fs_count = 1;
|
|
vp->v_ref_count = 1;
|
|
}
|
|
|
|
*vpp= vp;
|
|
*created= TRUE;
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
if (r == EEXIST && excl)
|
|
{
|
|
#if 0
|
|
printf(
|
|
"vfs:create_open: creating existing file with O_EXCL\n");
|
|
#endif
|
|
put_vnode(dir_vp);
|
|
return r;
|
|
}
|
|
|
|
/* Try a regular lookup */
|
|
memcpy(user_fullpath, lastc, len);
|
|
r1= lookup_rel_vp(dir_vp, 0 /*flags*/, 0 /*!use_realuid*/, &vp);
|
|
if (r1 != ENOENT)
|
|
{
|
|
put_vnode(dir_vp);
|
|
if (r1 == OK)
|
|
{
|
|
*vpp= vp;
|
|
*created= FALSE;
|
|
}
|
|
|
|
return r1;
|
|
}
|
|
if (r == EACCES)
|
|
{
|
|
/* We cannot create a new file and the file does not
|
|
* already exist.
|
|
*/
|
|
put_vnode(dir_vp);
|
|
return r;
|
|
}
|
|
|
|
/* The create failed with EEXIST and the regular lookup
|
|
* failed with ENOENT. We have to see whether the object
|
|
* we try to access actually exists, but is a symlink that
|
|
* cannot be resolved. If the symlink exists, we start
|
|
* with the contents of the symlink.
|
|
*/
|
|
memcpy(user_fullpath, lastc, len);
|
|
r= lookup_rel_vp(dir_vp, PATH_RET_SYMLINK, 0 /*!use_realuid*/,
|
|
&vp);
|
|
if (r != OK)
|
|
{
|
|
put_vnode(dir_vp);
|
|
return r;
|
|
}
|
|
|
|
if (!S_ISLNK(vp->v_mode))
|
|
{
|
|
/* Strange, we got an object, but it is not a symlink.
|
|
* Well, just return the object.
|
|
*/
|
|
put_vnode(dir_vp);
|
|
*vpp= vp;
|
|
*created= FALSE;
|
|
return OK;
|
|
}
|
|
|
|
/* Get the contents of the link */
|
|
len= sizeof(user_fullpath);
|
|
r= req_rdlink(vp->v_fs_e, vp->v_inode_nr, FS_PROC_NR,
|
|
(vir_bytes)user_fullpath, len-1);
|
|
put_vnode(vp);
|
|
if (r < 0)
|
|
{
|
|
printf("vfs:create_open: req_rdlink failed with %d\n",
|
|
r);
|
|
put_vnode(dir_vp);
|
|
return r;
|
|
}
|
|
if (r >= len)
|
|
{
|
|
printf(
|
|
"vfs:create_open: got bad length %d from req_rdlink\n",
|
|
r);
|
|
r= len-1;
|
|
}
|
|
user_fullpath[r]= '\0';
|
|
|
|
printf("got link target '%s'\n", user_fullpath);
|
|
if (user_fullpath[0] == '/')
|
|
{
|
|
put_vnode(dir_vp);
|
|
start_vp= fp->fp_rd;
|
|
dup_vnode(start_vp);
|
|
}
|
|
else
|
|
start_vp= dir_vp;
|
|
}
|
|
|
|
put_vnode(start_vp);
|
|
return ELOOP;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* exists_open *
|
|
*===========================================================================*/
|
|
PRIVATE int exists_open(vp, bits, oflags /*, omode, lastc, vpp */)
|
|
struct vnode *vp;
|
|
mode_t bits;
|
|
int oflags;
|
|
{
|
|
int r;
|
|
|
|
/* Check protections. */
|
|
if ((r = forbidden(vp, bits, 0 /*!use_realuid*/)) != OK)
|
|
return r;
|
|
|
|
/* Opening reg. files directories and special files differ. */
|
|
switch (vp->v_mode & I_TYPE) {
|
|
case I_REGULAR:
|
|
/* Truncate regular file if O_TRUNC. */
|
|
if (oflags & O_TRUNC) {
|
|
if ((r = forbidden(vp, W_BIT, 0 /*!use_realuid*/)) !=OK) break;
|
|
truncate_vn(vp, 0);
|
|
}
|
|
break;
|
|
|
|
case I_DIRECTORY:
|
|
/* Directories may be read but not written. */
|
|
r = (bits & W_BIT ? EISDIR : OK);
|
|
break;
|
|
|
|
case I_CHAR_SPECIAL:
|
|
case I_BLOCK_SPECIAL:
|
|
if (vp->v_sdev == (dev_t)-1)
|
|
panic(__FILE__, "vfs:exists_open: bad special", NO_NUM);
|
|
break;
|
|
|
|
case I_NAMED_PIPE:
|
|
#if 0
|
|
printf("vfs:exists_open: fifo vp 0x%x, for %s\n",
|
|
vp, ((bits & W_BIT) ? "writing" : "reading"));
|
|
#endif
|
|
if (vp->v_ref_count == 1)
|
|
{
|
|
vp->v_pipe_rd_pos= 0;
|
|
vp->v_pipe_wr_pos= 0;
|
|
if (vp->v_size != 0)
|
|
r= truncate_vn(vp, 0);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return(r);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* pipe_open *
|
|
*===========================================================================*/
|
|
PRIVATE int pipe_open(register struct vnode *vp, register mode_t bits,
|
|
register int oflags)
|
|
{
|
|
/* This function is called from common_open. It checks if
|
|
* there is at least one reader/writer pair for the pipe, if not
|
|
* it suspends the caller, otherwise it revives all other blocked
|
|
* processes hanging on the pipe.
|
|
*/
|
|
|
|
vp->v_pipe = I_PIPE;
|
|
|
|
if((bits & (R_BIT|W_BIT)) == (R_BIT|W_BIT)) {
|
|
printf("pipe opened RW.\n");
|
|
return ENXIO;
|
|
}
|
|
|
|
if (find_filp(vp, bits & W_BIT ? R_BIT : W_BIT) == NIL_FILP) {
|
|
if (oflags & O_NONBLOCK) {
|
|
if (bits & W_BIT) return(ENXIO);
|
|
} else {
|
|
suspend(XPOPEN); /* suspend caller */
|
|
return(SUSPEND);
|
|
}
|
|
} else if (susp_count > 0) {/* revive blocked processes */
|
|
release(vp, OPEN, susp_count);
|
|
release(vp, CREAT, susp_count);
|
|
}
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_mknod *
|
|
*===========================================================================*/
|
|
PUBLIC int do_mknod()
|
|
{
|
|
/* Perform the mknod(name, mode, addr) system call. */
|
|
register mode_t bits, mode_bits;
|
|
int r;
|
|
struct vnode *vp;
|
|
|
|
/* Only the super_user may make nodes other than fifos. */
|
|
mode_bits = (mode_t) m_in.mk_mode; /* mode of the inode */
|
|
if (!super_user && ((mode_bits & I_TYPE) != I_NAMED_PIPE)) return(EPERM);
|
|
if (fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
|
|
bits = (mode_bits & I_TYPE) | (mode_bits & ALL_MODES & fp->fp_umask);
|
|
|
|
/* Request lookup */
|
|
if ((r = lookup_lastdir(0 /*!use_realuid*/, &vp)) != OK) return r;
|
|
|
|
/* Make sure that the object is a directory */
|
|
if ((vp->v_mode & I_TYPE) != I_DIRECTORY)
|
|
{
|
|
put_vnode(vp);
|
|
return ENOTDIR;
|
|
}
|
|
|
|
r= forbidden(vp, W_BIT|X_BIT, 0 /*!use_realuid*/);
|
|
if (r != OK)
|
|
{
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
|
|
/* Issue request */
|
|
r= req_mknod(vp->v_fs_e, vp->v_inode_nr, user_fullpath,
|
|
fp->fp_effuid, fp->fp_effgid, bits, m_in.mk_z0);
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_mkdir *
|
|
*===========================================================================*/
|
|
PUBLIC int do_mkdir()
|
|
{
|
|
/* Perform the mkdir(name, mode) system call. */
|
|
mode_t bits; /* mode bits for the new inode */
|
|
int r;
|
|
struct vnode *vp;
|
|
|
|
if (fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
|
|
|
|
bits = I_DIRECTORY | (m_in.mode & RWX_MODES & fp->fp_umask);
|
|
|
|
/* Request lookup */
|
|
if ((r = lookup_lastdir(0 /*!use_realuid*/, &vp)) != OK) return r;
|
|
|
|
/* Make sure that the object is a directory */
|
|
if ((vp->v_mode & I_TYPE) != I_DIRECTORY)
|
|
{
|
|
put_vnode(vp);
|
|
return ENOTDIR;
|
|
}
|
|
|
|
r= forbidden(vp, W_BIT|X_BIT, 0 /*!use_realuid*/);
|
|
if (r != OK)
|
|
{
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
|
|
/* Issue request */
|
|
r= req_mkdir(vp->v_fs_e, vp->v_inode_nr, user_fullpath,
|
|
fp->fp_effuid, fp->fp_effgid, bits);
|
|
put_vnode(vp);
|
|
return r;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_lseek *
|
|
*===========================================================================*/
|
|
PUBLIC int do_lseek()
|
|
{
|
|
/* Perform the lseek(ls_fd, offset, whence) system call. */
|
|
register struct filp *rfilp;
|
|
int r;
|
|
long offset;
|
|
u64_t pos, newpos;
|
|
|
|
/* Check to see if the file descriptor is valid. */
|
|
if ( (rfilp = get_filp(m_in.ls_fd)) == NIL_FILP) return(err_code);
|
|
|
|
/* No lseek on pipes. */
|
|
if (rfilp->filp_vno->v_pipe == I_PIPE) return(ESPIPE);
|
|
|
|
/* The value of 'whence' determines the start position to use. */
|
|
switch(m_in.whence) {
|
|
case SEEK_SET: pos = cvu64(0); break;
|
|
case SEEK_CUR: pos = rfilp->filp_pos; break;
|
|
case SEEK_END: pos = cvul64(rfilp->filp_vno->v_size); break;
|
|
default: return(EINVAL);
|
|
}
|
|
|
|
offset= m_in.offset_lo;
|
|
if (offset >= 0)
|
|
newpos= add64ul(pos, offset);
|
|
else
|
|
newpos= sub64ul(pos, -offset);
|
|
|
|
/* Check for overflow. */
|
|
if (ex64hi(newpos) != 0)
|
|
return EINVAL;
|
|
|
|
if (cmp64(newpos, rfilp->filp_pos) != 0) { /* Inhibit read ahead request */
|
|
r = req_inhibread(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr);
|
|
if (r != OK) return r;
|
|
}
|
|
|
|
rfilp->filp_pos = newpos;
|
|
|
|
/* insert the new position into the output message */
|
|
m_out.reply_l1 = ex64lo(newpos);
|
|
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_llseek *
|
|
*===========================================================================*/
|
|
PUBLIC int do_llseek()
|
|
{
|
|
/* Perform the llseek(ls_fd, offset, whence) system call. */
|
|
register struct filp *rfilp;
|
|
u64_t pos, newpos;
|
|
int r;
|
|
|
|
/* Check to see if the file descriptor is valid. */
|
|
if ( (rfilp = get_filp(m_in.ls_fd)) == NIL_FILP) return(err_code);
|
|
|
|
/* No lseek on pipes. */
|
|
if (rfilp->filp_vno->v_pipe == I_PIPE) return(ESPIPE);
|
|
|
|
/* The value of 'whence' determines the start position to use. */
|
|
switch(m_in.whence) {
|
|
case SEEK_SET: pos = cvu64(0); break;
|
|
case SEEK_CUR: pos = rfilp->filp_pos; break;
|
|
case SEEK_END: pos = cvul64(rfilp->filp_vno->v_size); break;
|
|
default: return(EINVAL);
|
|
}
|
|
|
|
newpos= add64(pos, make64(m_in.offset_lo, m_in.offset_high));
|
|
|
|
/* Check for overflow. */
|
|
if (((long)m_in.offset_high > 0) && cmp64(newpos, pos) < 0)
|
|
return(EINVAL);
|
|
if (((long)m_in.offset_high < 0) && cmp64(newpos, pos) > 0)
|
|
return(EINVAL);
|
|
|
|
if (cmp64(newpos, rfilp->filp_pos) != 0) { /* Inhibit read ahead request */
|
|
r = req_inhibread(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr);
|
|
if (r != OK) return r;
|
|
}
|
|
|
|
rfilp->filp_pos = newpos;
|
|
m_out.reply_l1 = ex64lo(newpos);
|
|
m_out.reply_l2 = ex64hi(newpos);
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_close *
|
|
*===========================================================================*/
|
|
PUBLIC int do_close()
|
|
{
|
|
/* Perform the close(fd) system call. */
|
|
return close_fd(fp, m_in.fd);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* close_fd *
|
|
*===========================================================================*/
|
|
PUBLIC int close_fd(rfp, fd_nr)
|
|
struct fproc *rfp;
|
|
int fd_nr;
|
|
{
|
|
/* Perform the close(fd) system call. */
|
|
register struct filp *rfilp;
|
|
register struct vnode *vp;
|
|
struct file_lock *flp;
|
|
int lock_count;
|
|
|
|
/* First locate the vnode that belongs to the file descriptor. */
|
|
if ( (rfilp = get_filp2(rfp, fd_nr)) == NIL_FILP) return(err_code);
|
|
vp = rfilp->filp_vno;
|
|
close_filp(rfilp);
|
|
|
|
FD_CLR(fd_nr, &rfp->fp_cloexec_set);
|
|
rfp->fp_filp[fd_nr] = NIL_FILP;
|
|
FD_CLR(fd_nr, &rfp->fp_filp_inuse);
|
|
|
|
/* Check to see if the file is locked. If so, release all locks. */
|
|
if (nr_locks == 0) return(OK);
|
|
lock_count = nr_locks; /* save count of locks */
|
|
for (flp = &file_lock[0]; flp < &file_lock[NR_LOCKS]; flp++) {
|
|
if (flp->lock_type == 0) continue; /* slot not in use */
|
|
if (flp->lock_vnode == vp && flp->lock_pid == rfp->fp_pid) {
|
|
flp->lock_type = 0;
|
|
nr_locks--;
|
|
}
|
|
}
|
|
if (nr_locks < lock_count) lock_revive(); /* lock released */
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* close_filp *
|
|
*===========================================================================*/
|
|
PUBLIC void close_filp(fp)
|
|
struct filp *fp;
|
|
{
|
|
int mode_word, rw;
|
|
dev_t dev;
|
|
struct vnode *vp;
|
|
|
|
vp = fp->filp_vno;
|
|
if (fp->filp_count - 1 == 0 && fp->filp_mode != FILP_CLOSED) {
|
|
/* Check to see if the file is special. */
|
|
mode_word = vp->v_mode & I_TYPE;
|
|
if (mode_word == I_CHAR_SPECIAL || mode_word == I_BLOCK_SPECIAL) {
|
|
dev = (dev_t) vp->v_sdev;
|
|
if (mode_word == I_BLOCK_SPECIAL) {
|
|
if (vp->v_bfs_e == ROOT_FS_E)
|
|
{
|
|
/* Invalidate the cache unless the special is
|
|
* mounted. Assume that the root filesystem's
|
|
* is open only for fsck.
|
|
*/
|
|
req_flush(vp->v_bfs_e, dev);
|
|
}
|
|
}
|
|
/* Do any special processing on device close. */
|
|
(void) dev_close(dev, fp-filp);
|
|
|
|
/* Ignore any errors, even SUSPEND. */
|
|
}
|
|
}
|
|
|
|
/* If the inode being closed is a pipe, release everyone hanging on it. */
|
|
if (vp->v_pipe == I_PIPE) {
|
|
rw = (fp->filp_mode & R_BIT ? WRITE : READ);
|
|
release(vp, rw, NR_PROCS);
|
|
}
|
|
|
|
/* If a write has been done, the inode is already marked as DIRTY. */
|
|
if (--fp->filp_count == 0) {
|
|
if (vp->v_pipe == I_PIPE) {
|
|
/* Last reader or writer is going. Tell MFS about latest
|
|
* pipe size.
|
|
*/
|
|
truncate_vn(vp, vp->v_size);
|
|
}
|
|
|
|
put_vnode(fp->filp_vno);
|
|
}
|
|
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* close_reply *
|
|
*===========================================================================*/
|
|
PUBLIC void close_reply()
|
|
{
|
|
/* No need to do anything */
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_vm_open *
|
|
*===========================================================================*/
|
|
PUBLIC int do_vm_open()
|
|
{
|
|
int len, r, n;
|
|
endpoint_t ep;
|
|
|
|
len = m_in.VMVO_NAME_LENGTH;
|
|
m_out.VMV_ENDPOINT = ep = m_in.VMVO_ENDPOINT;
|
|
|
|
/* Do open() call on behalf of any process, performed by VM. */
|
|
if(len < 2 || len > sizeof(user_fullpath)) {
|
|
printf("do_vm_open: strange length %d\n", len);
|
|
m_out.VMVRO_FD = EINVAL;
|
|
return VM_VFS_REPLY_OPEN;
|
|
}
|
|
|
|
/* Do open on behalf of which process? */
|
|
if(isokendpt(ep, &n) != OK) {
|
|
printf("do_vm_open: strange endpoint %d\n", ep);
|
|
m_out.VMVRO_FD = EINVAL;
|
|
return VM_VFS_REPLY_OPEN;
|
|
}
|
|
|
|
/* XXX - do open on behalf of this process */
|
|
fp = &fproc[n];
|
|
|
|
/* Get path name from VM address space. */
|
|
if((r=sys_safecopyfrom(VM_PROC_NR, m_in.VMVO_NAME_GRANT, 0,
|
|
(vir_bytes) user_fullpath, len, D)) != OK) {
|
|
printf("do_vm_open: sys_safecopyfrom failed: %d\n", r);
|
|
m_out.VMVRO_FD = EPERM;
|
|
return VM_VFS_REPLY_OPEN;
|
|
}
|
|
|
|
/* Check if path is null-terminated. */
|
|
if(user_fullpath[len-1] != '\0') {
|
|
printf("do_vm_open: name (len %d) not 0-terminated\n", len);
|
|
m_out.VMVRO_FD = EINVAL;
|
|
return VM_VFS_REPLY_OPEN;
|
|
}
|
|
|
|
/* Perform open(). */
|
|
m_out.VMVRO_FD = common_open(m_in.VMVO_FLAGS, m_in.VMVO_MODE);
|
|
m_out.VMV_ENDPOINT = ep;
|
|
|
|
/* Send open() reply. */
|
|
return VM_VFS_REPLY_OPEN;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_vm_close *
|
|
*===========================================================================*/
|
|
PUBLIC int do_vm_close()
|
|
{
|
|
int len, r, n;
|
|
endpoint_t ep;
|
|
|
|
len = m_in.VMVO_NAME_LENGTH;
|
|
|
|
/* Do close() call on behalf of any process, performed by VM. */
|
|
m_out.VMV_ENDPOINT = ep = m_in.VMVC_ENDPOINT;
|
|
if(isokendpt(ep, &n) != OK) {
|
|
printf("do_vm_close: strange endpoint %d\n", ep);
|
|
return VM_VFS_REPLY_CLOSE;
|
|
}
|
|
|
|
/* Perform close(). */
|
|
r = close_fd(&fproc[n], m_in.VMVC_FD);
|
|
|
|
return VM_VFS_REPLY_CLOSE;
|
|
}
|
|
|