minix/servers/vfs/request.c
Lionel Sambuc b6aa3714a1 Remove protocol version of {mode,ino,uid,gid}_t
Now that we have enough room in the message, remove these types.

Change-Id: Ib734c6f0209b259a14a1189b3886b9c8474e1b9a
2014-07-28 17:05:29 +02:00

1213 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,
char *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, (vir_bytes) buf, size, CPF_WRITE);
} else {
grant_id = cpf_grant_magic(fs_e, who_e, (vir_bytes) 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,
char *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, (vir_bytes) 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);
}