565f13088f
Change the kernel to add features to vircopy and safecopies so that
transparent copy fixing won't happen to avoid deadlocks, and such copies
fail with EFAULT.
Transparently making copying work from filesystems (as normally done by
the kernel & VM when copying fails because of missing/readonly memory)
is problematic as it can happen that, for file-mapped ranges, that that
same filesystem that is blocked on the copy request is needed to satisfy
the memory range, leading to deadlock. Dito for VFS itself, if done with
a blocking call.
This change makes the copying done from a filesystem fail in such cases
with EFAULT by VFS adding the CPF_TRY flag to the grants. If a FS call
fails with EFAULT, VFS will then request the range to be made available
to VM after the FS is unblocked, allowing it to be used to satisfy the
range if need be in another VFS thread.
Similarly, for datacopies that VFS itself does, it uses the failable
vircopy variant and callers use a wrapper that talk to VM if necessary
to get the copy to work.
. kernel: add CPF_TRY flag to safecopies
. kernel: only request writable ranges to VM for the
target buffer when copying fails
. do copying in VFS TRY-first
. some fixes in VM to build SANITYCHECK mode
. add regression test for the cases where
- a FS system call needs memory mapped in a process that the
FS itself must map.
- such a range covers more than one file-mapped region.
. add 'try' mode to vircopy, physcopy
. add flags field to copy kernel call messages
. if CP_FLAG_TRY is set, do not transparently try
to fix memory ranges
. for use by VFS when accessing user buffers to avoid
deadlock
. remove some obsolete backwards compatability assignments
. VFS: let thread scheduling work for VM requests too
Allows VFS to make calls to VM while suspending and resuming
the currently running thread. Does currently not work for the
main thread.
. VM: add fix memory range call for use by VFS
Change-Id: I295794269cea51a3163519a9cfe5901301d90b32
1213 lines
29 KiB
C
1213 lines
29 KiB
C
/* This file contains the wrapper functions for issuing a request
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* and receiving response from FS processes.
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* Each function builds a request message according to the request
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* parameter, calls the most low-level fs_sendrec, and copies
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* back the response.
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*/
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#include "fs.h"
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#include <minix/com.h>
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#include <minix/const.h>
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#include <minix/endpoint.h>
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#include <minix/u64.h>
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#include <minix/vfsif.h>
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#include <sys/dirent.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <assert.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include "path.h"
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#include "vmnt.h"
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#include "vnode.h"
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/*===========================================================================*
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* req_breadwrite_actual *
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*===========================================================================*/
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static int req_breadwrite_actual(endpoint_t fs_e, endpoint_t user_e, dev_t dev, off_t pos,
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unsigned int num_of_bytes, vir_bytes user_addr, int rw_flag,
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off_t *new_pos, unsigned int *cum_iop, int cpflag)
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{
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int r;
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cp_grant_id_t grant_id;
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message m;
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grant_id = cpf_grant_magic(fs_e, user_e, user_addr, num_of_bytes,
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(rw_flag == READING ? CPF_WRITE : CPF_READ) | cpflag);
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if(grant_id == -1)
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panic("req_breadwrite: cpf_grant_magic failed");
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/* Fill in request message */
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m.m_type = rw_flag == READING ? REQ_BREAD : REQ_BWRITE;
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m.REQ_DEV = dev;
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m.REQ_GRANT = grant_id;
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m.REQ_SEEK_POS = pos;
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m.REQ_NBYTES = num_of_bytes;
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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cpf_revoke(grant_id);
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if (r != OK) return(r);
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/* Fill in response structure */
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*new_pos = m.RES_SEEK_POS;
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*cum_iop = m.RES_NBYTES;
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return(OK);
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}
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int req_breadwrite(endpoint_t fs_e, endpoint_t user_e, dev_t dev, off_t pos,
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unsigned int num_of_bytes, vir_bytes user_addr, int rw_flag,
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off_t *new_pos, unsigned int *cum_iop)
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{
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int r;
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r = req_breadwrite_actual(fs_e, user_e, dev, pos, num_of_bytes,
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user_addr, rw_flag, new_pos, cum_iop, CPF_TRY);
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if(r == EFAULT) {
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if((r=vm_vfs_procctl_handlemem(user_e, user_addr, num_of_bytes,
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rw_flag == READING)) != OK) {
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return r;
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}
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r = req_breadwrite_actual(fs_e, user_e, dev, pos, num_of_bytes,
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user_addr, rw_flag, new_pos, cum_iop, 0);
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}
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return r;
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}
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/*===========================================================================*
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* req_bpeek *
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*===========================================================================*/
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int req_bpeek(endpoint_t fs_e, dev_t dev, off_t pos, unsigned int num_of_bytes)
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{
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message m;
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memset(&m, 0, sizeof(m));
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/* Fill in request message */
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m.m_type = REQ_BPEEK;
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m.REQ_DEV = dev;
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m.REQ_SEEK_POS = pos;
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m.REQ_NBYTES = num_of_bytes;
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/* Send/rec request */
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return fs_sendrec(fs_e, &m);
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}
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/*===========================================================================*
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* req_chmod *
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*===========================================================================*/
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int req_chmod(
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endpoint_t fs_e,
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ino_t inode_nr,
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mode_t rmode,
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mode_t *new_modep
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)
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{
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message m;
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int r;
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/* Fill in request message */
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m.m_type = REQ_CHMOD;
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m.REQ_INODE_NR = (pino_t) inode_nr;
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m.REQ_MODE = (pmode_t) rmode;
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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/* Copy back actual mode. */
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*new_modep = (mode_t) m.RES_MODE;
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return(r);
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}
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/*===========================================================================*
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* req_chown *
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*===========================================================================*/
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int req_chown(
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endpoint_t fs_e,
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ino_t inode_nr,
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uid_t newuid,
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gid_t newgid,
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mode_t *new_modep
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)
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{
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message m;
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int r;
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/* Fill in request message */
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m.m_type = REQ_CHOWN;
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m.REQ_INODE_NR = (pino_t) inode_nr;
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m.REQ_UID = (puid_t) newuid;
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m.REQ_GID = (pgid_t) newgid;
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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/* Return new mode to caller. */
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*new_modep = (mode_t) m.RES_MODE;
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return(r);
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}
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/*===========================================================================*
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* req_create *
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*===========================================================================*/
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int req_create(
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endpoint_t fs_e,
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ino_t inode_nr,
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int omode,
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uid_t uid,
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gid_t gid,
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char *path,
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node_details_t *res
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)
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{
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int r;
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cp_grant_id_t grant_id;
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size_t len;
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message m;
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struct vmnt *vmp;
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vmp = find_vmnt(fs_e);
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len = strlen(path) + 1;
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grant_id = cpf_grant_direct(fs_e, (vir_bytes) path, len, CPF_READ);
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if (grant_id == -1)
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panic("req_create: cpf_grant_direct failed");
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/* Fill in request message */
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m.m_type = REQ_CREATE;
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m.REQ_INODE_NR = (pino_t) inode_nr;
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m.REQ_MODE = (pmode_t) omode;
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m.REQ_UID = (puid_t) uid;
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m.REQ_GID = (pgid_t) gid;
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m.REQ_GRANT = grant_id;
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m.REQ_PATH_LEN = len;
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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cpf_revoke(grant_id);
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if (r != OK) return(r);
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/* Fill in response structure */
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res->fs_e = m.m_source;
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res->inode_nr = (ino_t) m.RES_INODE_NR;
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res->fmode = (mode_t) m.RES_MODE;
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res->fsize = m.RES_FILE_SIZE;
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res->uid = (uid_t) m.RES_UID;
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res->gid = (gid_t) m.RES_GID;
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res->dev = NO_DEV;
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return(OK);
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}
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/*===========================================================================*
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* req_flush *
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*===========================================================================*/
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int req_flush(endpoint_t fs_e, dev_t dev)
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{
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message m;
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/* Fill in request message */
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m.m_type = REQ_FLUSH;
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m.REQ_DEV = dev;
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/* Send/rec request */
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return fs_sendrec(fs_e, &m);
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}
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/*===========================================================================*
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* req_statvfs *
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*===========================================================================*/
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int req_statvfs(endpoint_t fs_e, struct statvfs *buf)
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{
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int r;
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cp_grant_id_t grant_id;
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message m;
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grant_id = cpf_grant_direct(fs_e, (vir_bytes) buf, sizeof(struct statvfs),
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CPF_WRITE);
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if(grant_id == GRANT_INVALID)
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panic("req_statvfs: cpf_grant_direct failed");
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/* Fill in request message */
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m.m_type = REQ_STATVFS;
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m.REQ_GRANT = grant_id;
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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cpf_revoke(grant_id);
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return(r);
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}
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/*===========================================================================*
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* req_ftrunc *
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*===========================================================================*/
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int req_ftrunc(endpoint_t fs_e, ino_t inode_nr, off_t start, off_t end)
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{
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message m;
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struct vmnt *vmp;
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vmp = find_vmnt(fs_e);
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/* Fill in request message */
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m.m_type = REQ_FTRUNC;
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m.REQ_INODE_NR = (pino_t) inode_nr;
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m.REQ_TRC_START = start;
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m.REQ_TRC_END = end;
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if (!(vmp->m_fs_flags & RES_64BIT) &&
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((start > INT_MAX) || (end > INT_MAX))) {
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/* FS does not support 64-bit off_t and 32 bits is not enough */
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return EINVAL;
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}
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/* Send/rec request */
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return fs_sendrec(fs_e, &m);
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}
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/*===========================================================================*
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* req_getdents_actual *
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*===========================================================================*/
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static int req_getdents_actual(
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endpoint_t fs_e,
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ino_t inode_nr,
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off_t pos,
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char *buf,
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size_t size,
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off_t *new_pos,
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int direct,
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int cpflag
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)
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{
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int r;
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message m;
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cp_grant_id_t grant_id;
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struct vmnt *vmp;
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vmp = find_vmnt(fs_e);
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assert(vmp != NULL);
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if (direct) {
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grant_id = cpf_grant_direct(fs_e, (vir_bytes) buf, size, CPF_WRITE);
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} else {
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grant_id = cpf_grant_magic(fs_e, who_e, (vir_bytes) buf, size,
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CPF_WRITE | cpflag);
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}
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if (grant_id < 0)
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panic("req_getdents: cpf_grant_direct/cpf_grant_magic failed: %d",
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grant_id);
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m.m_type = REQ_GETDENTS;
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m.REQ_INODE_NR = (pino_t) inode_nr;
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m.REQ_GRANT = grant_id;
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m.REQ_MEM_SIZE = size;
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m.REQ_SEEK_POS = pos;
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if (!(vmp->m_fs_flags & RES_64BIT) && (pos > INT_MAX)) {
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/* FS does not support 64-bit off_t and 32 bits is not enough */
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return EINVAL;
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}
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r = fs_sendrec(fs_e, &m);
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cpf_revoke(grant_id);
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if (r == OK) {
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*new_pos = m.RES_SEEK_POS;
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r = m.RES_NBYTES;
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}
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return(r);
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}
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/*===========================================================================*
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* req_getdents *
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*===========================================================================*/
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int req_getdents(
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endpoint_t fs_e,
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ino_t inode_nr,
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off_t pos,
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char *buf,
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size_t size,
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off_t *new_pos,
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int direct)
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{
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int r;
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r = req_getdents_actual(fs_e, inode_nr, pos, buf, size, new_pos,
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direct, CPF_TRY);
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if(r == EFAULT && !direct) {
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if((r=vm_vfs_procctl_handlemem(who_e, (vir_bytes) buf,
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size, 1)) != OK) {
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return r;
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}
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r = req_getdents_actual(fs_e, inode_nr, pos, buf, size,
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new_pos, direct, 0);
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}
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return r;
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}
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/*===========================================================================*
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* req_inhibread *
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*===========================================================================*/
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int req_inhibread(endpoint_t fs_e, ino_t inode_nr)
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{
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message m;
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/* Fill in request message */
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m.m_type = REQ_INHIBREAD;
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m.REQ_INODE_NR = (pino_t) inode_nr;
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/* Send/rec request */
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return fs_sendrec(fs_e, &m);
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}
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/*===========================================================================*
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* req_link *
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*===========================================================================*/
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int req_link(
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endpoint_t fs_e,
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ino_t link_parent,
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char *lastc,
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ino_t linked_file
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)
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{
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int r;
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cp_grant_id_t grant_id;
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const size_t len = strlen(lastc) + 1;
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message m;
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grant_id = cpf_grant_direct(fs_e, (vir_bytes)lastc, len, CPF_READ);
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if(grant_id == -1)
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panic("req_link: cpf_grant_direct failed");
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/* Fill in request message */
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m.m_type = REQ_LINK;
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m.REQ_INODE_NR = (pino_t) linked_file;
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m.REQ_DIR_INO = (pino_t) link_parent;
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m.REQ_GRANT = grant_id;
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m.REQ_PATH_LEN = len;
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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cpf_revoke(grant_id);
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return(r);
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}
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|
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/*===========================================================================*
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* req_lookup *
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*===========================================================================*/
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int req_lookup(
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endpoint_t fs_e,
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ino_t dir_ino,
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ino_t root_ino,
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uid_t uid,
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gid_t gid,
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struct lookup *resolve,
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lookup_res_t *res,
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struct fproc *rfp
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)
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{
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message m;
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vfs_ucred_t credentials;
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int r, flags;
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size_t len;
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struct vmnt *vmp;
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cp_grant_id_t grant_id=0, grant_id2=0;
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vmp = find_vmnt(fs_e);
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grant_id = cpf_grant_direct(fs_e, (vir_bytes) resolve->l_path, PATH_MAX,
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CPF_READ | CPF_WRITE);
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if(grant_id == -1)
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panic("req_lookup: cpf_grant_direct failed");
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flags = resolve->l_flags;
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len = strlen(resolve->l_path) + 1;
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m.m_type = REQ_LOOKUP;
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m.REQ_GRANT = grant_id;
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m.REQ_PATH_LEN = len;
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m.REQ_PATH_SIZE = PATH_MAX + 1;
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m.REQ_DIR_INO = (pino_t) dir_ino;
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m.REQ_ROOT_INO = (pino_t) root_ino;
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if(rfp->fp_ngroups > 0) { /* Is the process member of multiple groups? */
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/* In that case the FS has to copy the uid/gid credentials */
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int i;
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/* Set credentials */
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credentials.vu_uid = rfp->fp_effuid;
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credentials.vu_gid = rfp->fp_effgid;
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credentials.vu_ngroups = rfp->fp_ngroups;
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for (i = 0; i < rfp->fp_ngroups; i++)
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credentials.vu_sgroups[i] = rfp->fp_sgroups[i];
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grant_id2 = cpf_grant_direct(fs_e, (vir_bytes) &credentials,
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sizeof(credentials), CPF_READ);
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if(grant_id2 == -1)
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panic("req_lookup: cpf_grant_direct failed");
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m.REQ_GRANT2 = grant_id2;
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m.REQ_UCRED_SIZE= sizeof(credentials);
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flags |= PATH_GET_UCRED;
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} else {
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/* When there's only one gid, we can send it directly */
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m.REQ_UID = (pgid_t) uid;
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m.REQ_GID = (pgid_t) gid;
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flags &= ~PATH_GET_UCRED;
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}
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m.REQ_FLAGS = flags;
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|
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/* Send/rec request */
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r = fs_sendrec(fs_e, &m);
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cpf_revoke(grant_id);
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if(rfp->fp_ngroups > 0) cpf_revoke(grant_id2);
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|
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/* Fill in response according to the return value */
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|
res->fs_e = m.m_source;
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switch (r) {
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case OK:
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res->inode_nr = (ino_t) m.RES_INODE_NR;
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res->fmode = (mode_t) m.RES_MODE;
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res->fsize = m.RES_FILE_SIZE;
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res->dev = m.RES_DEV;
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res->uid = (uid_t) m.RES_UID;
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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;
|
|
res->fsize = m.RES_FILE_SIZE;
|
|
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_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.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_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.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;
|
|
res->fsize = m.RES_FILE_SIZE;
|
|
res->uid = (uid_t) m.RES_UID;
|
|
res->gid = (gid_t) m.RES_GID;
|
|
*fs_flags = m.RES_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, unsigned int *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.REQ_INODE_NR = (pino_t) inode_nr;
|
|
m.REQ_GRANT = grant_id;
|
|
m.REQ_SEEK_POS = pos;
|
|
if ((!(vmp->m_fs_flags & RES_64BIT)) && (pos > INT_MAX)) {
|
|
return EINVAL;
|
|
}
|
|
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 */
|
|
*new_posp = m.RES_SEEK_POS;
|
|
*cum_iop = m.RES_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.REQ_INODE_NR = inode_nr;
|
|
m.REQ_GRANT = -1;
|
|
m.REQ_SEEK_POS = pos;
|
|
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_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.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_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.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_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.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);
|
|
}
|