minix/servers/vfs/request.c
Lionel Sambuc 7031438f58 Message type and related cleanup
- Intorduce and use a message type for VFS_GETDENTS, VFS_READ,
   VFS_WRITE.

 - Some cleanup to related functions where vir_bytes are replaced (and
   casted to/from, in parameter definition and local variables as well.

   This allow to see more clearly which function receives unsafe
   (pointer) values, or at least values which are not supposed to be
   valid in the address space of VFS. The current patch does so only
   for the minimal amount of functions which are concerned with the
   introduction of the new message type.

Change-Id: I0cdca97409c4016d02fae067b48bf55d37572c5c
2014-07-28 17:05:34 +02:00

1212 lines
30 KiB
C

/* This file contains the wrapper functions for issuing a request
* and receiving response from FS processes.
* Each function builds a request message according to the request
* parameter, calls the most low-level fs_sendrec, and copies
* back the response.
*/
#include "fs.h"
#include <minix/com.h>
#include <minix/const.h>
#include <minix/endpoint.h>
#include <minix/u64.h>
#include <minix/vfsif.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <assert.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "path.h"
#include "vmnt.h"
#include "vnode.h"
/*===========================================================================*
* req_breadwrite_actual *
*===========================================================================*/
static int req_breadwrite_actual(endpoint_t fs_e, endpoint_t user_e, dev_t dev, off_t pos,
unsigned int num_of_bytes, vir_bytes user_addr, int rw_flag,
off_t *new_pos, unsigned int *cum_iop, int cpflag)
{
int r;
cp_grant_id_t grant_id;
message m;
grant_id = cpf_grant_magic(fs_e, user_e, user_addr, num_of_bytes,
(rw_flag == READING ? CPF_WRITE : CPF_READ) | cpflag);
if(grant_id == -1)
panic("req_breadwrite: cpf_grant_magic failed");
/* Fill in request message */
m.m_type = rw_flag == READING ? REQ_BREAD : REQ_BWRITE;
m.m_vfs_fs_breadwrite.device = dev;
m.m_vfs_fs_breadwrite.grant = grant_id;
m.m_vfs_fs_breadwrite.seek_pos = pos;
m.m_vfs_fs_breadwrite.nbytes = num_of_bytes;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r != OK) return(r);
/* Fill in response structure */
*new_pos = m.m_fs_vfs_breadwrite.seek_pos;
*cum_iop = m.m_fs_vfs_breadwrite.nbytes;
return(OK);
}
int req_breadwrite(endpoint_t fs_e, endpoint_t user_e, dev_t dev, off_t pos,
unsigned int num_of_bytes, vir_bytes user_addr, int rw_flag,
off_t *new_pos, unsigned int *cum_iop)
{
int r;
r = req_breadwrite_actual(fs_e, user_e, dev, pos, num_of_bytes,
user_addr, rw_flag, new_pos, cum_iop, CPF_TRY);
if(r == EFAULT) {
if((r=vm_vfs_procctl_handlemem(user_e, user_addr, num_of_bytes,
rw_flag == READING)) != OK) {
return r;
}
r = req_breadwrite_actual(fs_e, user_e, dev, pos, num_of_bytes,
user_addr, rw_flag, new_pos, cum_iop, 0);
}
return r;
}
/*===========================================================================*
* req_bpeek *
*===========================================================================*/
int req_bpeek(endpoint_t fs_e, dev_t dev, off_t pos, unsigned int num_of_bytes)
{
message m;
memset(&m, 0, sizeof(m));
/* Fill in request message */
m.m_type = REQ_BPEEK;
m.m_vfs_fs_breadwrite.device = dev;
m.m_vfs_fs_breadwrite.seek_pos = pos;
m.m_vfs_fs_breadwrite.nbytes = num_of_bytes;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_chmod *
*===========================================================================*/
int req_chmod(
endpoint_t fs_e,
ino_t inode_nr,
mode_t rmode,
mode_t *new_modep
)
{
message m;
int r;
/* Fill in request message */
m.m_type = REQ_CHMOD;
m.m_vfs_fs_chmod.inode = inode_nr;
m.m_vfs_fs_chmod.mode = rmode;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
/* Copy back actual mode. */
*new_modep = m.m_fs_vfs_chmod.mode;
return(r);
}
/*===========================================================================*
* req_chown *
*===========================================================================*/
int req_chown(
endpoint_t fs_e,
ino_t inode_nr,
uid_t newuid,
gid_t newgid,
mode_t *new_modep
)
{
message m;
int r;
/* Fill in request message */
m.m_type = REQ_CHOWN;
m.m_vfs_fs_chown.inode = inode_nr;
m.m_vfs_fs_chown.uid = newuid;
m.m_vfs_fs_chown.gid = newgid;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
/* Return new mode to caller. */
*new_modep = m.m_fs_vfs_chown.mode;
return(r);
}
/*===========================================================================*
* req_create *
*===========================================================================*/
int req_create(
endpoint_t fs_e,
ino_t inode_nr,
int omode,
uid_t uid,
gid_t gid,
char *path,
node_details_t *res
)
{
int r;
cp_grant_id_t grant_id;
size_t len;
message m;
struct vmnt *vmp;
vmp = find_vmnt(fs_e);
len = strlen(path) + 1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes) path, len, CPF_READ);
if (grant_id == -1)
panic("req_create: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_CREATE;
m.m_vfs_fs_create.inode = inode_nr;
m.m_vfs_fs_create.mode = omode;
m.m_vfs_fs_create.uid = uid;
m.m_vfs_fs_create.gid = gid;
m.m_vfs_fs_create.grant = grant_id;
m.m_vfs_fs_create.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r != OK) return(r);
/* Fill in response structure */
res->fs_e = m.m_source;
res->inode_nr = m.m_fs_vfs_create.inode;
res->fmode = m.m_fs_vfs_create.mode;
res->fsize = m.m_fs_vfs_create.file_size;
res->uid = m.m_fs_vfs_create.uid;
res->gid = m.m_fs_vfs_create.gid;
res->dev = NO_DEV;
return(OK);
}
/*===========================================================================*
* req_flush *
*===========================================================================*/
int req_flush(endpoint_t fs_e, dev_t dev)
{
message m;
/* Fill in request message */
m.m_type = REQ_FLUSH;
m.m_vfs_fs_flush.device = dev;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_statvfs *
*===========================================================================*/
int req_statvfs(endpoint_t fs_e, struct statvfs *buf)
{
int r;
cp_grant_id_t grant_id;
message m;
grant_id = cpf_grant_direct(fs_e, (vir_bytes) buf, sizeof(struct statvfs),
CPF_WRITE);
if(grant_id == GRANT_INVALID)
panic("req_statvfs: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_STATVFS;
m.m_vfs_fs_statvfs.grant = grant_id;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_ftrunc *
*===========================================================================*/
int req_ftrunc(endpoint_t fs_e, ino_t inode_nr, off_t start, off_t end)
{
message m;
struct vmnt *vmp;
vmp = find_vmnt(fs_e);
/* Fill in request message */
m.m_type = REQ_FTRUNC;
m.m_vfs_fs_ftrunc.inode = inode_nr;
m.m_vfs_fs_ftrunc.trc_start = start;
m.m_vfs_fs_ftrunc.trc_end = end;
if (!(vmp->m_fs_flags & RES_64BIT) &&
((start > INT_MAX) || (end > INT_MAX))) {
/* FS does not support 64-bit off_t and 32 bits is not enough */
return EINVAL;
}
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_getdents_actual *
*===========================================================================*/
static int req_getdents_actual(
endpoint_t fs_e,
ino_t inode_nr,
off_t pos,
vir_bytes buf,
size_t size,
off_t *new_pos,
int direct,
int cpflag
)
{
int r;
message m;
cp_grant_id_t grant_id;
struct vmnt *vmp;
vmp = find_vmnt(fs_e);
assert(vmp != NULL);
if (direct) {
grant_id = cpf_grant_direct(fs_e, buf, size, CPF_WRITE);
} else {
grant_id = cpf_grant_magic(fs_e, who_e, buf, size,
CPF_WRITE | cpflag);
}
if (grant_id < 0)
panic("req_getdents: cpf_grant_direct/cpf_grant_magic failed: %d",
grant_id);
m.m_type = REQ_GETDENTS;
m.m_vfs_fs_getdents.inode = inode_nr;
m.m_vfs_fs_getdents.grant = grant_id;
m.m_vfs_fs_getdents.mem_size = size;
m.m_vfs_fs_getdents.seek_pos = pos;
if (!(vmp->m_fs_flags & RES_64BIT) && (pos > INT_MAX)) {
/* FS does not support 64-bit off_t and 32 bits is not enough */
return EINVAL;
}
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r == OK) {
*new_pos = m.m_fs_vfs_getdents.seek_pos;
r = m.m_fs_vfs_getdents.nbytes;
}
return(r);
}
/*===========================================================================*
* req_getdents *
*===========================================================================*/
int req_getdents(
endpoint_t fs_e,
ino_t inode_nr,
off_t pos,
vir_bytes buf,
size_t size,
off_t *new_pos,
int direct)
{
int r;
r = req_getdents_actual(fs_e, inode_nr, pos, buf, size, new_pos,
direct, CPF_TRY);
if(r == EFAULT && !direct) {
if((r=vm_vfs_procctl_handlemem(who_e, buf, size, 1)) != OK) {
return r;
}
r = req_getdents_actual(fs_e, inode_nr, pos, buf, size,
new_pos, direct, 0);
}
return r;
}
/*===========================================================================*
* req_inhibread *
*===========================================================================*/
int req_inhibread(endpoint_t fs_e, ino_t inode_nr)
{
message m;
/* Fill in request message */
m.m_type = REQ_INHIBREAD;
m.m_vfs_fs_inhibread.inode = inode_nr;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_link *
*===========================================================================*/
int req_link(
endpoint_t fs_e,
ino_t link_parent,
char *lastc,
ino_t linked_file
)
{
int r;
cp_grant_id_t grant_id;
const size_t len = strlen(lastc) + 1;
message m;
grant_id = cpf_grant_direct(fs_e, (vir_bytes)lastc, len, CPF_READ);
if(grant_id == -1)
panic("req_link: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_LINK;
m.m_vfs_fs_link.inode = linked_file;
m.m_vfs_fs_link.dir_ino = link_parent;
m.m_vfs_fs_link.grant = grant_id;
m.m_vfs_fs_link.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_lookup *
*===========================================================================*/
int req_lookup(
endpoint_t fs_e,
ino_t dir_ino,
ino_t root_ino,
uid_t uid,
gid_t gid,
struct lookup *resolve,
lookup_res_t *res,
struct fproc *rfp
)
{
message m;
vfs_ucred_t credentials;
int r, flags;
size_t len;
struct vmnt *vmp;
cp_grant_id_t grant_id=0, grant_id2=0;
vmp = find_vmnt(fs_e);
grant_id = cpf_grant_direct(fs_e, (vir_bytes) resolve->l_path, PATH_MAX,
CPF_READ | CPF_WRITE);
if(grant_id == -1)
panic("req_lookup: cpf_grant_direct failed");
flags = resolve->l_flags;
len = strlen(resolve->l_path) + 1;
m.m_type = REQ_LOOKUP;
m.m_vfs_fs_lookup.grant_path = grant_id;
m.m_vfs_fs_lookup.path_len = len;
m.m_vfs_fs_lookup.path_size = PATH_MAX + 1;
m.m_vfs_fs_lookup.dir_ino = dir_ino;
m.m_vfs_fs_lookup.root_ino = root_ino;
if(rfp->fp_ngroups > 0) { /* Is the process member of multiple groups? */
/* In that case the FS has to copy the uid/gid credentials */
int i;
/* Set credentials */
credentials.vu_uid = rfp->fp_effuid;
credentials.vu_gid = rfp->fp_effgid;
credentials.vu_ngroups = rfp->fp_ngroups;
for (i = 0; i < rfp->fp_ngroups; i++)
credentials.vu_sgroups[i] = rfp->fp_sgroups[i];
grant_id2 = cpf_grant_direct(fs_e, (vir_bytes) &credentials,
sizeof(credentials), CPF_READ);
if(grant_id2 == -1)
panic("req_lookup: cpf_grant_direct failed");
m.m_vfs_fs_lookup.grant_ucred = grant_id2;
m.m_vfs_fs_lookup.ucred_size = sizeof(credentials);
flags |= PATH_GET_UCRED;
} else {
/* When there's only one gid, we can send it directly */
m.m_vfs_fs_lookup.uid = uid;
m.m_vfs_fs_lookup.gid = gid;
flags &= ~PATH_GET_UCRED;
}
m.m_vfs_fs_lookup.flags = flags;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if(rfp->fp_ngroups > 0) cpf_revoke(grant_id2);
/* Fill in response according to the return value */
res->fs_e = m.m_source;
switch (r) {
case OK:
res->inode_nr = m.m_fs_vfs_lookup.inode;
res->fmode = m.m_fs_vfs_lookup.mode;
res->fsize = m.m_fs_vfs_lookup.file_size;
res->dev = m.m_fs_vfs_lookup.device;
res->uid = m.m_fs_vfs_lookup.uid;
res->gid = m.m_fs_vfs_lookup.gid;
break;
case EENTERMOUNT:
res->inode_nr = m.m_fs_vfs_lookup.inode;
res->char_processed = m.m_fs_vfs_lookup.offset;
res->symloop = m.m_fs_vfs_lookup.symloop;
break;
case ELEAVEMOUNT:
res->char_processed = m.m_fs_vfs_lookup.offset;
res->symloop = m.m_fs_vfs_lookup.symloop;
break;
case ESYMLINK:
res->char_processed = m.m_fs_vfs_lookup.offset;
res->symloop = m.m_fs_vfs_lookup.symloop;
break;
default:
break;
}
return(r);
}
/*===========================================================================*
* req_mkdir *
*===========================================================================*/
int req_mkdir(
endpoint_t fs_e,
ino_t inode_nr,
char *lastc,
uid_t uid,
gid_t gid,
mode_t dmode
)
{
int r;
cp_grant_id_t grant_id;
size_t len;
message m;
len = strlen(lastc) + 1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes)lastc, len, CPF_READ);
if(grant_id == -1)
panic("req_mkdir: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_MKDIR;
m.m_vfs_fs_mkdir.inode = inode_nr;
m.m_vfs_fs_mkdir.mode = dmode;
m.m_vfs_fs_mkdir.uid = uid;
m.m_vfs_fs_mkdir.gid = gid;
m.m_vfs_fs_mkdir.grant = grant_id;
m.m_vfs_fs_mkdir.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_mknod *
*===========================================================================*/
int req_mknod(
endpoint_t fs_e,
ino_t inode_nr,
char *lastc,
uid_t uid,
gid_t gid,
mode_t dmode,
dev_t dev
)
{
int r;
size_t len;
cp_grant_id_t grant_id;
message m;
len = strlen(lastc) + 1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes)lastc, len, CPF_READ);
if(grant_id == -1)
panic("req_mknod: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_MKNOD;
m.m_vfs_fs_mknod.inode = inode_nr;
m.m_vfs_fs_mknod.mode = dmode;
m.m_vfs_fs_mknod.device = dev;
m.m_vfs_fs_mknod.uid = uid;
m.m_vfs_fs_mknod.gid = gid;
m.m_vfs_fs_mknod.grant = grant_id;
m.m_vfs_fs_mknod.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_mountpoint *
*===========================================================================*/
int req_mountpoint(endpoint_t fs_e, ino_t inode_nr)
{
message m;
/* Fill in request message */
m.m_type = REQ_MOUNTPOINT;
m.m_vfs_fs_mountpoint.inode = inode_nr;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_newnode *
*===========================================================================*/
int req_newnode(
endpoint_t fs_e,
uid_t uid,
gid_t gid,
mode_t dmode,
dev_t dev,
struct node_details *res
)
{
struct vmnt *vmp;
int r;
message m;
vmp = find_vmnt(fs_e);
/* Fill in request message */
m.m_type = REQ_NEWNODE;
m.m_vfs_fs_newnode.mode = dmode;
m.m_vfs_fs_newnode.device = dev;
m.m_vfs_fs_newnode.uid = uid;
m.m_vfs_fs_newnode.gid = gid;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
res->fs_e = m.m_source;
res->inode_nr = m.m_fs_vfs_newnode.inode;
res->fmode = m.m_fs_vfs_newnode.mode;
res->fsize = m.m_fs_vfs_newnode.file_size;
res->dev = m.m_fs_vfs_newnode.device;
res->uid = m.m_fs_vfs_newnode.uid;
res->gid = m.m_fs_vfs_newnode.gid;
return(r);
}
/*===========================================================================*
* req_newdriver *
*===========================================================================*/
int req_newdriver(
endpoint_t fs_e,
dev_t dev,
char *label
)
{
cp_grant_id_t grant_id;
size_t len;
message m;
int r;
/* Grant access to label */
len = strlen(label) + 1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes) label, len, CPF_READ);
if (grant_id == -1)
panic("req_newdriver: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_NEW_DRIVER;
m.m_vfs_fs_new_driver.device = dev;
m.m_vfs_fs_new_driver.grant = grant_id;
m.m_vfs_fs_new_driver.path_len = len;
/* Issue request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_putnode *
*===========================================================================*/
int req_putnode(fs_e, inode_nr, count)
int fs_e;
ino_t inode_nr;
int count;
{
message m;
/* Fill in request message */
m.m_type = REQ_PUTNODE;
m.m_vfs_fs_putnode.inode = inode_nr;
m.m_vfs_fs_putnode.count = count;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_rdlink_actual *
*===========================================================================*/
static int req_rdlink_actual(endpoint_t fs_e, ino_t inode_nr,
endpoint_t proc_e, vir_bytes buf, size_t len,
int direct, /* set to 1 to use direct grants instead of magic grants */
int cpflag)
{
message m;
int r;
cp_grant_id_t grant_id;
if (direct) {
grant_id = cpf_grant_direct(fs_e, buf, len, CPF_WRITE);
} else {
grant_id = cpf_grant_magic(fs_e, proc_e, buf, len, CPF_WRITE | cpflag);
}
if (grant_id == -1)
panic("req_rdlink: cpf_grant_magic failed");
/* Fill in request message */
m.m_type = REQ_RDLINK;
m.m_vfs_fs_rdlink.inode = inode_nr;
m.m_vfs_fs_rdlink.grant = grant_id;
m.m_vfs_fs_rdlink.mem_size = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r == OK) r = m.m_fs_vfs_rdlink.nbytes;
return(r);
}
/*===========================================================================*
* req_rdlink *
*===========================================================================*/
int req_rdlink(endpoint_t fs_e, ino_t inode_nr, endpoint_t proc_e,
vir_bytes buf, size_t len,
int direct /* set to 1 to use direct grants instead of magic grants */
)
{
int r;
r = req_rdlink_actual(fs_e, inode_nr, proc_e, buf, len, direct,
CPF_TRY);
if(r == EFAULT && !direct) {
if((r=vm_vfs_procctl_handlemem(proc_e, buf, len, 1)) != OK) {
return r;
}
r = req_rdlink_actual(fs_e, inode_nr, proc_e, buf, len,
direct, 0);
}
return r;
}
/*===========================================================================*
* req_readsuper *
*===========================================================================*/
int req_readsuper(
struct vmnt *vmp,
char *label,
dev_t dev,
int readonly,
int isroot,
struct node_details *res,
unsigned int *fs_flags
)
{
int r;
cp_grant_id_t grant_id;
size_t len;
message m;
endpoint_t fs_e;
fs_e = vmp->m_fs_e;
len = strlen(label)+1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes) label, len, CPF_READ);
if (grant_id == -1)
panic("req_readsuper: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_READSUPER;
m.m_vfs_fs_readsuper.flags = 0;
if(readonly) m.m_vfs_fs_readsuper.flags |= REQ_RDONLY;
if(isroot) m.m_vfs_fs_readsuper.flags |= REQ_ISROOT;
m.m_vfs_fs_readsuper.grant = grant_id;
m.m_vfs_fs_readsuper.device = dev;
m.m_vfs_fs_readsuper.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if(r == OK) {
/* Fill in response structure */
res->fs_e = m.m_source;
res->inode_nr = m.m_fs_vfs_readsuper.inode;
res->fmode = m.m_fs_vfs_readsuper.mode;
res->fsize = m.m_fs_vfs_readsuper.file_size;
res->uid = m.m_fs_vfs_readsuper.uid;
res->gid = m.m_fs_vfs_readsuper.gid;
*fs_flags = m.m_fs_vfs_readsuper.flags;
}
return(r);
}
/*===========================================================================*
* req_readwrite_actual *
*===========================================================================*/
static int req_readwrite_actual(endpoint_t fs_e, ino_t inode_nr, off_t pos,
int rw_flag, endpoint_t user_e, vir_bytes user_addr,
unsigned int num_of_bytes, off_t *new_posp, size_t *cum_iop,
int cpflag)
{
struct vmnt *vmp;
int r;
cp_grant_id_t grant_id;
message m;
vmp = find_vmnt(fs_e);
grant_id = cpf_grant_magic(fs_e, user_e, user_addr, num_of_bytes,
(rw_flag==READING ? CPF_WRITE:CPF_READ) | cpflag);
if (grant_id == -1)
panic("req_readwrite: cpf_grant_magic failed");
/* Fill in request message */
m.m_type = rw_flag == READING ? REQ_READ : REQ_WRITE;
m.m_vfs_fs_readwrite.inode = inode_nr;
m.m_vfs_fs_readwrite.grant = grant_id;
m.m_vfs_fs_readwrite.seek_pos = pos;
if ((!(vmp->m_fs_flags & RES_64BIT)) && (pos > INT_MAX)) {
return EINVAL;
}
m.m_vfs_fs_readwrite.nbytes = num_of_bytes;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r == OK) {
/* Fill in response structure */
*new_posp = m.m_fs_vfs_readwrite.seek_pos;
*cum_iop = m.m_fs_vfs_readwrite.nbytes;
}
return(r);
}
/*===========================================================================*
* req_readwrite *
*===========================================================================*/
int req_readwrite(endpoint_t fs_e, ino_t inode_nr, off_t pos,
int rw_flag, endpoint_t user_e, vir_bytes user_addr,
unsigned int num_of_bytes, off_t *new_posp, unsigned int *cum_iop)
{
int r;
r = req_readwrite_actual(fs_e, inode_nr, pos, rw_flag, user_e,
user_addr, num_of_bytes, new_posp, cum_iop, CPF_TRY);
if(r == EFAULT) {
if((r=vm_vfs_procctl_handlemem(user_e, (vir_bytes) user_addr, num_of_bytes,
rw_flag == READING)) != OK) {
return r;
}
r = req_readwrite_actual(fs_e, inode_nr, pos, rw_flag, user_e,
user_addr, num_of_bytes, new_posp, cum_iop, 0);
}
return r;
}
/*===========================================================================*
* req_peek *
*===========================================================================*/
int req_peek(endpoint_t fs_e, ino_t inode_nr, off_t pos, unsigned int bytes)
{
message m;
memset(&m, 0, sizeof(m));
if (ex64hi(pos) != 0)
panic("req_peek: pos too large");
/* Fill in request message */
m.m_type = REQ_PEEK;
m.m_vfs_fs_readwrite.inode = inode_nr;
m.m_vfs_fs_readwrite.grant = -1;
m.m_vfs_fs_readwrite.seek_pos = pos;
m.m_vfs_fs_readwrite.nbytes = bytes;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_rename *
*===========================================================================*/
int req_rename(fs_e, old_dir, old_name, new_dir, new_name)
endpoint_t fs_e;
ino_t old_dir;
char *old_name;
ino_t new_dir;
char *new_name;
{
int r;
cp_grant_id_t gid_old, gid_new;
size_t len_old, len_new;
message m;
len_old = strlen(old_name) + 1;
gid_old = cpf_grant_direct(fs_e, (vir_bytes) old_name, len_old, CPF_READ);
if(gid_old == -1)
panic("req_rename: cpf_grant_direct failed");
len_new = strlen(new_name) + 1;
gid_new = cpf_grant_direct(fs_e, (vir_bytes) new_name, len_new, CPF_READ);
if(gid_new == -1)
panic("req_rename: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_RENAME;
m.m_vfs_fs_rename.dir_old = old_dir;
m.m_vfs_fs_rename.grant_old = gid_old;
m.m_vfs_fs_rename.len_old = len_old;
m.m_vfs_fs_rename.dir_new = new_dir;
m.m_vfs_fs_rename.grant_new = gid_new;
m.m_vfs_fs_rename.len_new = len_new;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(gid_old);
cpf_revoke(gid_new);
return(r);
}
/*===========================================================================*
* req_rmdir *
*===========================================================================*/
int req_rmdir(fs_e, inode_nr, lastc)
endpoint_t fs_e;
ino_t inode_nr;
char *lastc;
{
int r;
cp_grant_id_t grant_id;
size_t len;
message m;
len = strlen(lastc) + 1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes) lastc, len, CPF_READ);
if(grant_id == -1)
panic("req_rmdir: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_RMDIR;
m.m_vfs_fs_unlink.inode = inode_nr;
m.m_vfs_fs_unlink.grant = grant_id;
m.m_vfs_fs_unlink.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_slink_actual *
*===========================================================================*/
static int req_slink_actual(
endpoint_t fs_e,
ino_t inode_nr,
char *lastc,
endpoint_t proc_e,
vir_bytes path_addr,
size_t path_length,
uid_t uid,
gid_t gid,
int cpflag
)
{
int r;
size_t len;
cp_grant_id_t gid_name, gid_buf;
message m;
len = strlen(lastc) + 1;
gid_name = cpf_grant_direct(fs_e, (vir_bytes) lastc, len, CPF_READ);
if (gid_name == GRANT_INVALID)
panic("req_slink: cpf_grant_direct failed");
gid_buf = cpf_grant_magic(fs_e, proc_e, path_addr, path_length,
CPF_READ | cpflag);
if (gid_buf == GRANT_INVALID) {
cpf_revoke(gid_name);
panic("req_slink: cpf_grant_magic failed");
}
/* Fill in request message */
m.m_type = REQ_SLINK;
m.m_vfs_fs_slink.inode = inode_nr;
m.m_vfs_fs_slink.uid = uid;
m.m_vfs_fs_slink.gid = gid;
m.m_vfs_fs_slink.grant_path = gid_name;
m.m_vfs_fs_slink.path_len = len;
m.m_vfs_fs_slink.grant_target = gid_buf;
m.m_vfs_fs_slink.mem_size = path_length;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(gid_name);
cpf_revoke(gid_buf);
return(r);
}
/*===========================================================================*
* req_slink *
*===========================================================================*/
int req_slink(
endpoint_t fs_e,
ino_t inode_nr,
char *lastc,
endpoint_t proc_e,
vir_bytes path_addr,
size_t path_length,
uid_t uid,
gid_t gid
)
{
int r;
r = req_slink_actual(fs_e, inode_nr, lastc, proc_e, path_addr,
path_length, uid, gid, CPF_TRY);
if(r == EFAULT) {
if((r=vm_vfs_procctl_handlemem(proc_e, (vir_bytes) path_addr,
path_length, 0)) != OK) {
return r;
}
r = req_slink_actual(fs_e, inode_nr, lastc, proc_e, path_addr,
path_length, uid, gid, 0);
}
return r;
}
/*===========================================================================*
* req_stat_actual *
*===========================================================================*/
int req_stat_actual(endpoint_t fs_e, ino_t inode_nr, endpoint_t proc_e,
vir_bytes buf, int cpflag)
{
cp_grant_id_t grant_id;
int r;
message m;
/* Grant FS access to copy straight into user provided buffer */
grant_id = cpf_grant_magic(fs_e, proc_e, buf, sizeof(struct stat),
CPF_WRITE | cpflag);
if (grant_id < 0)
panic("req_stat: cpf_grant_* failed");
/* Fill in request message */
m.m_type = REQ_STAT;
m.m_vfs_fs_stat.inode = inode_nr;
m.m_vfs_fs_stat.grant = grant_id;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_stat *
*===========================================================================*/
int req_stat(endpoint_t fs_e, ino_t inode_nr, endpoint_t proc_e,
vir_bytes buf)
{
int r;
r = req_stat_actual(fs_e, inode_nr, proc_e, buf, CPF_TRY);
if(r == EFAULT) {
if((r=vm_vfs_procctl_handlemem(proc_e, (vir_bytes) buf,
sizeof(struct stat), 1)) != OK) {
return r;
}
r = req_stat_actual(fs_e, inode_nr, proc_e, buf, 0);
}
return r;
}
/*===========================================================================*
* req_sync *
*===========================================================================*/
int req_sync(fs_e)
endpoint_t fs_e;
{
message m;
/* Fill in request message */
m.m_type = REQ_SYNC;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_unlink *
*===========================================================================*/
int req_unlink(fs_e, inode_nr, lastc)
endpoint_t fs_e;
ino_t inode_nr;
char *lastc;
{
cp_grant_id_t grant_id;
size_t len;
int r;
message m;
len = strlen(lastc) + 1;
grant_id = cpf_grant_direct(fs_e, (vir_bytes) lastc, len, CPF_READ);
if(grant_id == -1)
panic("req_unlink: cpf_grant_direct failed");
/* Fill in request message */
m.m_type = REQ_UNLINK;
m.m_vfs_fs_unlink.inode = inode_nr;
m.m_vfs_fs_unlink.grant = grant_id;
m.m_vfs_fs_unlink.path_len = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
return(r);
}
/*===========================================================================*
* req_unmount *
*===========================================================================*/
int req_unmount(fs_e)
endpoint_t fs_e;
{
message m;
/* Fill in request message */
m.m_type = REQ_UNMOUNT;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_utime *
*===========================================================================*/
int req_utime(endpoint_t fs_e, ino_t inode_nr, struct timespec * actimespec,
struct timespec * modtimespec)
{
message m;
assert(actimespec != NULL);
assert(modtimespec != NULL);
/* Fill in request message */
m.m_type = REQ_UTIME;
m.m_vfs_fs_utime.inode = inode_nr;
m.m_vfs_fs_utime.actime = actimespec->tv_sec;
m.m_vfs_fs_utime.modtime = modtimespec->tv_sec;
m.m_vfs_fs_utime.acnsec = actimespec->tv_nsec;
m.m_vfs_fs_utime.modnsec = modtimespec->tv_nsec;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}