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minix/servers/vfs/request.c
David van Moolenbroek 723e51327f VFS: worker thread model overhaul 
The main purpose of this patch is to fix handling of unpause calls
from PM while another call is ongoing. The solution to this problem
sparked a full revision of the threading model, consisting of a large
number of related changes:

- all active worker threads are now always associated with a process,
  and every process has at most one active thread working for it;
- the process lock is always held by a process's worker thread;
- a process can now have both normal work and postponed PM work
  associated to it;
- timer expiry and non-postponed PM work is done from the main thread;
- filp garbage collection is done from a thread associated with VFS;
- reboot calls from PM are now done from a thread associated with PM;
- the DS events handler is protected from starting multiple threads;
- support for a system worker thread has been removed;
- the deadlock recovery thread has been replaced by a parameter to the
  worker_start() function; the number of worker threads has
  consequently been increased by one;
- saving and restoring of global but per-thread variables is now
  centralized in worker_suspend() and worker_resume(); err_code is now
  saved and restored in all cases;
- the concept of jobs has been removed, and job_m_in now points to a
  message stored in the worker thread structure instead;
- the PM lock has been removed;
- the separate exec lock has been replaced by a lock on the VM
  process, which was already being locked for exec calls anyway;
- PM_UNPAUSE is now processed as a postponed PM request, from a thread
  associated with the target process;
- the FP_DROP_WORK flag has been removed, since it is no longer more
  than just an optimization and only applied to processes operating on
  a pipe when getting killed;
- assignment to "fp" now takes place only when obtaining new work in
  the main thread or a worker thread, when resuming execution of a
  thread, and in the special case of exiting processes during reboot;
- there are no longer special cases where the yield() call is used to
  force a thread to run.

Change-Id: I7a97b9b95c2450454a9b5318dfa0e6150d4e6858
2014-02-18 11:25:03 +01:00

1117 lines
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/* 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 *
*===========================================================================*/
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;
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));
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.REQ_DEV2 = dev;
m.REQ_GRANT = grant_id;
m.REQ_SEEK_POS_LO = ex64lo(pos);
m.REQ_SEEK_POS_HI = ex64hi(pos);
m.REQ_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 = make64(m.RES_SEEK_POS_LO, m.RES_SEEK_POS_HI);
*cum_iop = m.RES_NBYTES;
return(OK);
}
/*===========================================================================*
* 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.REQ_DEV2 = dev;
m.REQ_SEEK_POS_LO = ex64lo(pos);
m.REQ_SEEK_POS_HI = ex64hi(pos);
m.REQ_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_MODE = (pmode_t) rmode;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
/* Copy back actual mode. */
*new_modep = (mode_t) m.RES_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_UID = (puid_t) newuid;
m.REQ_GID = (pgid_t) newgid;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
/* Return new mode to caller. */
*new_modep = (mode_t) m.RES_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_MODE = (pmode_t) omode;
m.REQ_UID = (puid_t) uid;
m.REQ_GID = (pgid_t) gid;
m.REQ_GRANT = grant_id;
m.REQ_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 = (ino_t) m.RES_INODE_NR;
res->fmode = (mode_t) m.RES_MODE;
if (vmp->m_fs_flags & RES_64BIT) {
res->fsize = make64(m.RES_FILE_SIZE_LO, m.RES_FILE_SIZE_HI);
} else {
res->fsize = m.RES_FILE_SIZE_LO;
}
res->uid = (uid_t) m.RES_UID;
res->gid = (gid_t) m.RES_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.REQ_DEV = 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.REQ_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_TRC_START_LO = ex64lo(start);
if (vmp->m_fs_flags & RES_64BIT) {
m.REQ_TRC_START_HI = ex64hi(start);
} else if (start > INT_MAX) {
/* FS does not support 64-bit off_t and 32 bits is not enough */
return EINVAL;
} else {
m.REQ_TRC_START_HI = 0;
}
m.REQ_TRC_END_LO = ex64lo(end);
if (vmp->m_fs_flags & RES_64BIT) {
m.REQ_TRC_END_HI = ex64hi(end);
} else if (end > INT_MAX) {
/* FS does not support 64-bit off_t and 32 bits is not enough */
return EINVAL;
} else {
m.REQ_TRC_END_HI = 0;
}
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* 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;
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);
}
if (grant_id < 0)
panic("req_getdents: cpf_grant_direct/cpf_grant_magic failed: %d",
grant_id);
m.m_type = REQ_GETDENTS;
m.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_GRANT = grant_id;
m.REQ_MEM_SIZE = size;
m.REQ_SEEK_POS_LO = ex64lo(pos);
if (vmp->m_fs_flags & RES_64BIT) {
m.REQ_SEEK_POS_HI = ex64hi(pos);
} else if (pos > INT_MAX) {
/* FS does not support 64-bit off_t and 32 bits is not enough */
return EINVAL;
} else {
m.REQ_SEEK_POS_HI = 0;
}
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r == OK) {
if (vmp->m_fs_flags & RES_64BIT) {
*new_pos = make64(m.RES_SEEK_POS_LO, m.RES_SEEK_POS_HI);
} else {
*new_pos = m.RES_SEEK_POS_LO;
}
r = m.RES_NBYTES;
}
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.REQ_INODE_NR = (pino_t) 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.REQ_INODE_NR = (pino_t) linked_file;
m.REQ_DIR_INO = (pino_t) link_parent;
m.REQ_GRANT = grant_id;
m.REQ_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.REQ_GRANT = grant_id;
m.REQ_PATH_LEN = len;
m.REQ_PATH_SIZE = PATH_MAX + 1;
m.REQ_DIR_INO = (pino_t) dir_ino;
m.REQ_ROOT_INO = (pino_t) 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.REQ_GRANT2 = grant_id2;
m.REQ_UCRED_SIZE= sizeof(credentials);
flags |= PATH_GET_UCRED;
} else {
/* When there's only one gid, we can send it directly */
m.REQ_UID = (pgid_t) uid;
m.REQ_GID = (pgid_t) gid;
flags &= ~PATH_GET_UCRED;
}
m.REQ_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 = (ino_t) m.RES_INODE_NR;
res->fmode = (mode_t) m.RES_MODE;
if (vmp->m_fs_flags & RES_64BIT) {
res->fsize = make64(m.RES_FILE_SIZE_LO, m.RES_FILE_SIZE_HI);
} else {
res->fsize = m.RES_FILE_SIZE_LO;
}
res->dev = m.RES_DEV;
res->uid = (uid_t) m.RES_UID;
res->gid = (gid_t) m.RES_GID;
break;
case EENTERMOUNT:
res->inode_nr = (ino_t) m.RES_INODE_NR;
res->char_processed = m.RES_OFFSET;
res->symloop = m.RES_SYMLOOP;
break;
case ELEAVEMOUNT:
res->char_processed = m.RES_OFFSET;
res->symloop = m.RES_SYMLOOP;
break;
case ESYMLINK:
res->char_processed = m.RES_OFFSET;
res->symloop = m.RES_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_MODE = (pmode_t) dmode;
m.REQ_UID = (puid_t) uid;
m.REQ_GID = (pgid_t) gid;
m.REQ_GRANT = grant_id;
m.REQ_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_MODE = (pmode_t) dmode;
m.REQ_DEV = dev;
m.REQ_UID = (puid_t) uid;
m.REQ_GID = (pgid_t) gid;
m.REQ_GRANT = grant_id;
m.REQ_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.REQ_INODE_NR = (pino_t) 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.REQ_MODE = (pmode_t) dmode;
m.REQ_DEV = dev;
m.REQ_UID = (puid_t) uid;
m.REQ_GID = (pgid_t) gid;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
res->fs_e = m.m_source;
res->inode_nr = (ino_t) m.RES_INODE_NR;
res->fmode = (mode_t) m.RES_MODE;
if (vmp->m_fs_flags & RES_64BIT) {
res->fsize = make64(m.RES_FILE_SIZE_LO, m.RES_FILE_SIZE_HI);
} else {
res->fsize = m.RES_FILE_SIZE_LO;
}
res->dev = m.RES_DEV;
res->uid = (uid_t) m.RES_UID;
res->gid = (gid_t) m.RES_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.REQ_DEV = dev;
m.REQ_GRANT = grant_id;
m.REQ_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_COUNT = count;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
/*===========================================================================*
* req_rdlink *
*===========================================================================*/
int req_rdlink(fs_e, inode_nr, proc_e, buf, len, direct)
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 */
{
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);
}
if (grant_id == -1)
panic("req_rdlink: cpf_grant_magic failed");
/* Fill in request message */
m.m_type = REQ_RDLINK;
m.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_GRANT = grant_id;
m.REQ_MEM_SIZE = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r == OK) r = m.RES_NBYTES;
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.REQ_FLAGS = 0;
if(readonly) m.REQ_FLAGS |= REQ_RDONLY;
if(isroot) m.REQ_FLAGS |= REQ_ISROOT;
m.REQ_GRANT = grant_id;
m.REQ_DEV = dev;
m.REQ_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 = (ino_t) m.RES_INODE_NR;
res->fmode = (mode_t) m.RES_MODE;
if (m.RES_FLAGS & RES_64BIT) {
res->fsize = make64(m.RES_FILE_SIZE_LO, m.RES_FILE_SIZE_HI);
} else {
res->fsize = m.RES_FILE_SIZE_LO;
}
res->uid = (uid_t) m.RES_UID;
res->gid = (gid_t) m.RES_GID;
*fs_flags = m.RES_FLAGS;
}
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)
{
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));
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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_GRANT = grant_id;
m.REQ_SEEK_POS_LO = ex64lo(pos);
if (vmp->m_fs_flags & RES_64BIT) {
m.REQ_SEEK_POS_HI = ex64hi(pos);
} else if (pos > INT_MAX) {
return EINVAL;
} else {
m.REQ_SEEK_POS_HI = 0;
}
m.REQ_NBYTES = num_of_bytes;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
if (r == OK) {
/* Fill in response structure */
if (vmp->m_fs_flags & RES_64BIT) {
*new_posp = make64(m.RES_SEEK_POS_LO, m.RES_SEEK_POS_HI);
} else {
*new_posp = m.RES_SEEK_POS_LO;
}
*cum_iop = m.RES_NBYTES;
}
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.REQ_INODE_NR = inode_nr;
m.REQ_GRANT = -1;
m.REQ_SEEK_POS_LO = ex64lo(pos);
m.REQ_SEEK_POS_HI = 0; /* Not used for now, so clear it. */
m.REQ_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.REQ_REN_OLD_DIR = (pino_t) old_dir;
m.REQ_REN_NEW_DIR = (pino_t) new_dir;
m.REQ_REN_GRANT_OLD = gid_old;
m.REQ_REN_LEN_OLD = len_old;
m.REQ_REN_GRANT_NEW = gid_new;
m.REQ_REN_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_GRANT = grant_id;
m.REQ_PATH_LEN = len;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
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;
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);
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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_UID = (puid_t) uid;
m.REQ_GID = (pgid_t) gid;
m.REQ_GRANT = gid_name;
m.REQ_PATH_LEN = len;
m.REQ_GRANT3 = gid_buf;
m.REQ_MEM_SIZE = path_length;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(gid_name);
cpf_revoke(gid_buf);
return(r);
}
/*===========================================================================*
* req_stat *
*===========================================================================*/
int req_stat(endpoint_t fs_e, ino_t inode_nr, endpoint_t proc_e, vir_bytes buf)
{
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);
if (grant_id < 0)
panic("req_stat: cpf_grant_* failed");
/* Fill in request message */
m.m_type = REQ_STAT;
m.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_GRANT = grant_id;
/* Send/rec request */
r = fs_sendrec(fs_e, &m);
cpf_revoke(grant_id);
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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_GRANT = grant_id;
m.REQ_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.REQ_INODE_NR = (pino_t) inode_nr;
m.REQ_INODE_NR = inode_nr;
m.REQ_ACTIME = actimespec->tv_sec;
m.REQ_MODTIME = modtimespec->tv_sec;
m.REQ_ACNSEC = actimespec->tv_nsec;
m.REQ_MODNSEC = modtimespec->tv_nsec;
/* Send/rec request */
return fs_sendrec(fs_e, &m);
}
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