2005-04-21 16:53:53 +02:00
|
|
|
/* This file contains a collection of miscellaneous procedures. Some of them
|
|
|
|
* perform simple system calls. Some others do a little part of system calls
|
|
|
|
* that are mostly performed by the Memory Manager.
|
|
|
|
*
|
|
|
|
* The entry points into this file are
|
|
|
|
* do_dup: perform the DUP system call
|
|
|
|
* do_fcntl: perform the FCNTL system call
|
|
|
|
* do_sync: perform the SYNC system call
|
2005-07-01 19:58:29 +02:00
|
|
|
* do_fsync: perform the FSYNC system call
|
2012-02-13 16:28:04 +01:00
|
|
|
* pm_reboot: sync disks and prepare for shutdown
|
2010-07-15 16:47:08 +02:00
|
|
|
* pm_fork: adjust the tables after PM has performed a FORK system call
|
2010-01-05 20:39:27 +01:00
|
|
|
* do_exec: handle files with FD_CLOEXEC on after PM has done an EXEC
|
2005-04-21 16:53:53 +02:00
|
|
|
* do_exit: a process has exited; note that in the tables
|
2006-10-25 15:40:36 +02:00
|
|
|
* do_set: set uid or gid for some process
|
|
|
|
* do_revive: revive a process that was waiting for something (e.g. TTY)
|
2005-04-21 16:53:53 +02:00
|
|
|
* do_svrctl: file system control
|
|
|
|
* do_getsysinfo: request copy of FS data structure
|
2006-05-11 16:57:23 +02:00
|
|
|
* pm_dumpcore: create a core dump
|
2005-04-21 16:53:53 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include "fs.h"
|
|
|
|
#include <fcntl.h>
|
2006-06-20 12:12:09 +02:00
|
|
|
#include <assert.h>
|
2011-09-08 15:57:03 +02:00
|
|
|
#include <unistd.h>
|
|
|
|
#include <string.h>
|
2005-04-21 16:53:53 +02:00
|
|
|
#include <minix/callnr.h>
|
2006-06-20 12:12:09 +02:00
|
|
|
#include <minix/safecopies.h>
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
#include <minix/endpoint.h>
|
2005-04-21 16:53:53 +02:00
|
|
|
#include <minix/com.h>
|
2010-09-14 23:50:05 +02:00
|
|
|
#include <minix/sysinfo.h>
|
2006-11-27 15:21:43 +01:00
|
|
|
#include <minix/u64.h>
|
2006-05-11 16:57:23 +02:00
|
|
|
#include <sys/ptrace.h>
|
2005-04-21 16:53:53 +02:00
|
|
|
#include <sys/svrctl.h>
|
|
|
|
#include "file.h"
|
|
|
|
#include "fproc.h"
|
2012-02-13 16:28:04 +01:00
|
|
|
#include "scratchpad.h"
|
|
|
|
#include "dmap.h"
|
2006-10-25 15:40:36 +02:00
|
|
|
#include <minix/vfsif.h>
|
|
|
|
#include "vnode.h"
|
|
|
|
#include "vmnt.h"
|
2012-02-13 16:28:04 +01:00
|
|
|
#include "param.h"
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2006-05-11 16:57:23 +02:00
|
|
|
#define CORE_NAME "core"
|
|
|
|
#define CORE_MODE 0777 /* mode to use on core image files */
|
|
|
|
|
2006-07-10 14:44:43 +02:00
|
|
|
#if ENABLE_SYSCALL_STATS
|
2012-03-25 20:25:53 +02:00
|
|
|
unsigned long calls_stats[NCALLS];
|
2006-07-10 14:44:43 +02:00
|
|
|
#endif
|
|
|
|
|
2012-03-25 20:25:53 +02:00
|
|
|
static void free_proc(struct fproc *freed, int flags);
|
2006-10-25 15:40:36 +02:00
|
|
|
/*
|
2012-03-25 20:25:53 +02:00
|
|
|
static int dumpcore(int proc_e, struct mem_map *seg_ptr);
|
|
|
|
static int write_bytes(struct inode *rip, off_t off, char *buf, size_t
|
2012-03-24 16:16:34 +01:00
|
|
|
bytes);
|
2012-03-25 20:25:53 +02:00
|
|
|
static int write_seg(struct inode *rip, off_t off, int proc_e, int seg,
|
2012-03-24 16:16:34 +01:00
|
|
|
off_t seg_off, phys_bytes seg_bytes);
|
2006-10-25 15:40:36 +02:00
|
|
|
*/
|
2006-03-15 16:34:12 +01:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/*===========================================================================*
|
2005-09-11 18:45:46 +02:00
|
|
|
* do_getsysinfo *
|
2005-04-21 16:53:53 +02:00
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int do_getsysinfo()
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
2005-06-06 15:51:50 +02:00
|
|
|
vir_bytes src_addr, dst_addr;
|
2012-04-13 14:50:38 +02:00
|
|
|
size_t len, buf_size;
|
|
|
|
int what;
|
|
|
|
|
|
|
|
what = job_m_in.SI_WHAT;
|
|
|
|
dst_addr = (vir_bytes) job_m_in.SI_WHERE;
|
|
|
|
buf_size = (size_t) job_m_in.SI_SIZE;
|
2005-06-06 15:51:50 +02:00
|
|
|
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
/* Only su may call do_getsysinfo. This call may leak information (and is not
|
2011-11-07 21:11:30 +01:00
|
|
|
* stable enough to be part of the API/ABI). In the future, requests from
|
|
|
|
* non-system processes should be denied.
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
if (!super_user) return(EPERM);
|
2006-05-19 14:19:37 +02:00
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
switch(what) {
|
2012-02-13 16:28:04 +01:00
|
|
|
case SI_PROC_TAB:
|
|
|
|
src_addr = (vir_bytes) fproc;
|
|
|
|
len = sizeof(struct fproc) * NR_PROCS;
|
|
|
|
break;
|
|
|
|
case SI_DMAP_TAB:
|
|
|
|
src_addr = (vir_bytes) dmap;
|
|
|
|
len = sizeof(struct dmap) * NR_DEVICES;
|
|
|
|
break;
|
2006-07-10 14:44:43 +02:00
|
|
|
#if ENABLE_SYSCALL_STATS
|
2012-02-13 16:28:04 +01:00
|
|
|
case SI_CALL_STATS:
|
|
|
|
src_addr = (vir_bytes) calls_stats;
|
|
|
|
len = sizeof(calls_stats);
|
|
|
|
break;
|
2006-07-10 14:44:43 +02:00
|
|
|
#endif
|
2012-11-22 23:00:00 +01:00
|
|
|
case SI_VMNT_TAB:
|
2012-11-27 18:33:59 +01:00
|
|
|
fetch_vmnt_paths();
|
2012-11-22 23:00:00 +01:00
|
|
|
src_addr = (vir_bytes) vmnt;
|
|
|
|
len = sizeof(struct vmnt) * NR_MNTS;
|
|
|
|
break;
|
2012-02-13 16:28:04 +01:00
|
|
|
default:
|
|
|
|
return(EINVAL);
|
2005-06-06 15:51:50 +02:00
|
|
|
}
|
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
if (len != buf_size)
|
2011-12-11 22:30:35 +01:00
|
|
|
return(EINVAL);
|
2005-06-06 15:51:50 +02:00
|
|
|
|
2011-12-11 22:30:35 +01:00
|
|
|
return sys_datacopy(SELF, src_addr, who_e, dst_addr, len);
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*===========================================================================*
|
|
|
|
* do_dup *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int do_dup()
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
|
|
|
/* Perform the dup(fd) or dup2(fd,fd2) system call. These system calls are
|
|
|
|
* obsolete. In fact, it is not even possible to invoke them using the
|
|
|
|
* current library because the library routines call fcntl(). They are
|
|
|
|
* provided to permit old binary programs to continue to run.
|
|
|
|
*/
|
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
int rfd, rfd2;
|
|
|
|
struct filp *f;
|
2012-02-13 16:28:04 +01:00
|
|
|
int r = OK;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
scratch(fp).file.fd_nr = job_m_in.fd;
|
|
|
|
rfd2 = job_m_in.fd2;
|
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Is the file descriptor valid? */
|
2012-04-13 14:50:38 +02:00
|
|
|
rfd = scratch(fp).file.fd_nr & ~DUP_MASK; /* kill off dup2 bit, if on */
|
2012-02-13 16:28:04 +01:00
|
|
|
if ((f = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
|
2005-04-21 16:53:53 +02:00
|
|
|
|
|
|
|
/* Distinguish between dup and dup2. */
|
2012-04-13 14:50:38 +02:00
|
|
|
if (!(scratch(fp).file.fd_nr & DUP_MASK)) { /* bit not on */
|
2005-04-21 16:53:53 +02:00
|
|
|
/* dup(fd) */
|
2012-04-13 14:50:38 +02:00
|
|
|
r = get_fd(0, 0, &rfd2, NULL);
|
2005-04-21 16:53:53 +02:00
|
|
|
} else {
|
2012-02-13 16:28:04 +01:00
|
|
|
/* dup2(old_fd, new_fd) */
|
2012-04-13 14:50:38 +02:00
|
|
|
if (rfd2 < 0 || rfd2 >= OPEN_MAX) {
|
2012-02-13 16:28:04 +01:00
|
|
|
r = EBADF;
|
2012-04-13 14:50:38 +02:00
|
|
|
} else if (rfd == rfd2) { /* ignore the call: dup2(x, x) */
|
|
|
|
r = rfd2;
|
2012-02-13 16:28:04 +01:00
|
|
|
} else {
|
|
|
|
/* All is fine, close new_fd if necessary */
|
|
|
|
unlock_filp(f); /* or it might deadlock on do_close */
|
2012-04-13 14:50:38 +02:00
|
|
|
(void) close_fd(fp, rfd2); /* cannot fail */
|
2012-02-13 16:28:04 +01:00
|
|
|
f = get_filp(rfd, VNODE_READ); /* lock old_fd again */
|
2012-07-13 18:08:06 +02:00
|
|
|
if (f == NULL) return(err_code);
|
2012-02-13 16:28:04 +01:00
|
|
|
}
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if (r == OK) {
|
|
|
|
/* Success. Set up new file descriptors. */
|
|
|
|
f->filp_count++;
|
2012-04-13 14:50:38 +02:00
|
|
|
fp->fp_filp[rfd2] = f;
|
|
|
|
FD_SET(rfd2, &fp->fp_filp_inuse);
|
|
|
|
r = rfd2;
|
2012-02-13 16:28:04 +01:00
|
|
|
}
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
unlock_filp(f);
|
|
|
|
return(r);
|
|
|
|
}
|
2006-10-25 15:40:36 +02:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/*===========================================================================*
|
|
|
|
* do_fcntl *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int do_fcntl()
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
|
|
|
/* Perform the fcntl(fd, request, ...) system call. */
|
|
|
|
|
|
|
|
register struct filp *f;
|
2012-04-13 14:50:38 +02:00
|
|
|
int new_fd, fl, r = OK, fcntl_req, fcntl_argx;
|
2012-02-13 16:28:04 +01:00
|
|
|
tll_access_t locktype;
|
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
scratch(fp).file.fd_nr = job_m_in.fd;
|
|
|
|
scratch(fp).io.io_buffer = job_m_in.buffer;
|
|
|
|
scratch(fp).io.io_nbytes = job_m_in.nbytes; /* a.k.a. m_in.request */
|
|
|
|
fcntl_req = job_m_in.request;
|
|
|
|
fcntl_argx = job_m_in.addr;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
|
|
|
/* Is the file descriptor valid? */
|
2012-04-13 14:50:38 +02:00
|
|
|
locktype = (fcntl_req == F_FREESP) ? VNODE_WRITE : VNODE_READ;
|
2012-02-13 16:28:04 +01:00
|
|
|
if ((f = get_filp(scratch(fp).file.fd_nr, locktype)) == NULL)
|
|
|
|
return(err_code);
|
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
switch (fcntl_req) {
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_DUPFD:
|
2005-04-21 16:53:53 +02:00
|
|
|
/* This replaces the old dup() system call. */
|
2012-04-13 14:50:38 +02:00
|
|
|
if (fcntl_argx < 0 || fcntl_argx >= OPEN_MAX) r = EINVAL;
|
|
|
|
else if ((r = get_fd(fcntl_argx, 0, &new_fd, NULL)) == OK) {
|
2012-02-13 16:28:04 +01:00
|
|
|
f->filp_count++;
|
|
|
|
fp->fp_filp[new_fd] = f;
|
|
|
|
FD_SET(new_fd, &fp->fp_filp_inuse);
|
|
|
|
r = new_fd;
|
|
|
|
}
|
|
|
|
break;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_GETFD:
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Get close-on-exec flag (FD_CLOEXEC in POSIX Table 6-2). */
|
2012-02-13 16:28:04 +01:00
|
|
|
r = 0;
|
|
|
|
if (FD_ISSET(scratch(fp).file.fd_nr, &fp->fp_cloexec_set))
|
|
|
|
r = FD_CLOEXEC;
|
|
|
|
break;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_SETFD:
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Set close-on-exec flag (FD_CLOEXEC in POSIX Table 6-2). */
|
2012-04-13 14:50:38 +02:00
|
|
|
if (fcntl_argx & FD_CLOEXEC)
|
2012-02-13 16:28:04 +01:00
|
|
|
FD_SET(scratch(fp).file.fd_nr, &fp->fp_cloexec_set);
|
2006-06-27 18:47:35 +02:00
|
|
|
else
|
2012-02-13 16:28:04 +01:00
|
|
|
FD_CLR(scratch(fp).file.fd_nr, &fp->fp_cloexec_set);
|
|
|
|
break;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_GETFL:
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Get file status flags (O_NONBLOCK and O_APPEND). */
|
|
|
|
fl = f->filp_flags & (O_NONBLOCK | O_APPEND | O_ACCMODE);
|
2012-02-13 16:28:04 +01:00
|
|
|
r = fl;
|
|
|
|
break;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_SETFL:
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Set file status flags (O_NONBLOCK and O_APPEND). */
|
2008-02-22 15:49:02 +01:00
|
|
|
fl = O_NONBLOCK | O_APPEND | O_REOPEN;
|
2012-04-13 14:50:38 +02:00
|
|
|
f->filp_flags = (f->filp_flags & ~fl) | (fcntl_argx & fl);
|
2012-02-13 16:28:04 +01:00
|
|
|
break;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_GETLK:
|
|
|
|
case F_SETLK:
|
|
|
|
case F_SETLKW:
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Set or clear a file lock. */
|
2012-04-13 14:50:38 +02:00
|
|
|
r = lock_op(f, fcntl_req);
|
2012-02-13 16:28:04 +01:00
|
|
|
break;
|
2006-01-11 18:14:51 +01:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
case F_FREESP:
|
2006-01-11 18:14:51 +01:00
|
|
|
{
|
2012-02-13 16:28:04 +01:00
|
|
|
/* Free a section of a file */
|
2006-01-11 18:14:51 +01:00
|
|
|
off_t start, end;
|
|
|
|
struct flock flock_arg;
|
|
|
|
signed long offset;
|
|
|
|
|
|
|
|
/* Check if it's a regular file. */
|
2012-04-25 14:44:42 +02:00
|
|
|
if (!S_ISREG(f->filp_vno->v_mode)) r = EINVAL;
|
2012-02-13 16:28:04 +01:00
|
|
|
else if (!(f->filp_mode & W_BIT)) r = EBADF;
|
|
|
|
else
|
|
|
|
/* Copy flock data from userspace. */
|
2012-04-13 14:50:38 +02:00
|
|
|
r = sys_datacopy(who_e, (vir_bytes) scratch(fp).io.io_buffer,
|
|
|
|
SELF, (vir_bytes) &flock_arg,
|
|
|
|
sizeof(flock_arg));
|
2008-11-19 13:26:10 +01:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if (r != OK) break;
|
2006-01-11 18:14:51 +01:00
|
|
|
|
|
|
|
/* Convert starting offset to signed. */
|
|
|
|
offset = (signed long) flock_arg.l_start;
|
|
|
|
|
|
|
|
/* Figure out starting position base. */
|
|
|
|
switch(flock_arg.l_whence) {
|
2012-02-13 16:28:04 +01:00
|
|
|
case SEEK_SET: start = 0; break;
|
|
|
|
case SEEK_CUR:
|
|
|
|
if (ex64hi(f->filp_pos) != 0)
|
2010-03-05 16:05:11 +01:00
|
|
|
panic("do_fcntl: position in file too high");
|
2012-02-13 16:28:04 +01:00
|
|
|
start = ex64lo(f->filp_pos);
|
|
|
|
break;
|
|
|
|
case SEEK_END: start = f->filp_vno->v_size; break;
|
|
|
|
default: r = EINVAL;
|
2006-01-11 18:14:51 +01:00
|
|
|
}
|
2012-02-13 16:28:04 +01:00
|
|
|
if (r != OK) break;
|
2006-01-11 18:14:51 +01:00
|
|
|
|
|
|
|
/* Check for overflow or underflow. */
|
2012-02-13 16:28:04 +01:00
|
|
|
if (offset > 0 && start + offset < start) r = EINVAL;
|
|
|
|
else if (offset < 0 && start + offset > start) r = EINVAL;
|
|
|
|
else {
|
|
|
|
start += offset;
|
|
|
|
if (start < 0) r = EINVAL;
|
|
|
|
}
|
|
|
|
if (r != OK) break;
|
|
|
|
|
|
|
|
if (flock_arg.l_len != 0) {
|
|
|
|
if (start >= f->filp_vno->v_size) r = EINVAL;
|
|
|
|
else if ((end = start + flock_arg.l_len) <= start) r = EINVAL;
|
|
|
|
else if (end > f->filp_vno->v_size) end = f->filp_vno->v_size;
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
} else {
|
2006-10-25 15:40:36 +02:00
|
|
|
end = 0;
|
2006-01-11 18:14:51 +01:00
|
|
|
}
|
2012-02-13 16:28:04 +01:00
|
|
|
if (r != OK) break;
|
2010-02-09 09:12:37 +01:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
r = req_ftrunc(f->filp_vno->v_fs_e, f->filp_vno->v_inode_nr,start,end);
|
2010-02-09 09:12:37 +01:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if (r == OK && flock_arg.l_len == 0)
|
2010-02-09 09:12:37 +01:00
|
|
|
f->filp_vno->v_size = start;
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
break;
|
2006-01-11 18:14:51 +01:00
|
|
|
}
|
2013-02-25 12:36:29 +01:00
|
|
|
case F_GETNOSIGPIPE:
|
|
|
|
/* POSIX: return value other than -1 is flag is set, else -1 */
|
|
|
|
r = -1;
|
|
|
|
if (f->filp_flags & O_NOSIGPIPE)
|
|
|
|
r = 0;
|
|
|
|
break;
|
|
|
|
case F_SETNOSIGPIPE:
|
|
|
|
fl = (O_NOSIGPIPE);
|
|
|
|
f->filp_flags = (f->filp_flags & ~fl) | (fcntl_argx & fl);
|
|
|
|
break;
|
2012-02-13 16:28:04 +01:00
|
|
|
default:
|
|
|
|
r = EINVAL;
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
unlock_filp(f);
|
|
|
|
return(r);
|
|
|
|
}
|
2006-10-25 15:40:36 +02:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/*===========================================================================*
|
|
|
|
* do_sync *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int do_sync()
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
2006-10-25 15:40:36 +02:00
|
|
|
struct vmnt *vmp;
|
2012-02-13 16:28:04 +01:00
|
|
|
int r = OK;
|
|
|
|
|
|
|
|
for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp) {
|
VFS: fix locking bugs
.sync and fsync used unnecessarily restrictive locking type
.fsync violated locking order by obtaining a vmnt lock after a filp lock
.fsync contained a TOCTOU bug
.new_node violated locking rules (didn't upgrade lock upon file creation)
.do_pipe used unnecessarily restrictive locking type
.always lock pipes exclusively; even a read operation might require to do
a write on a vnode object (update pipe size)
.when opening a file with O_TRUNC, upgrade vnode lock when truncating
.utime used unnecessarily restrictive locking type
.path parsing:
.always acquire VMNT_WRITE or VMNT_EXCL on vmnt and downgrade to
VMNT_READ if that was what was actually requested. This prevents the
following deadlock scenario:
thread A:
lock_vmnt(vmp, TLL_READSER);
lock_vnode(vp, TLL_READSER);
upgrade_vmnt_lock(vmp, TLL_WRITE);
thread B:
lock_vmnt(vmp, TLL_READ);
lock_vnode(vp, TLL_READSER);
thread A will be stuck in upgrade_vmnt_lock and thread B is stuck in
lock_vnode. This happens when, for example, thread A tries create a
new node (open.c:new_node) and thread B tries to do eat_path to
change dir (stadir.c:do_chdir). When the path is being resolved, a
vnode is always locked with VNODE_OPCL (TLL_READSER) and then
downgraded to VNODE_READ if read-only is actually requested. Thread
A locks the vmnt with VMNT_WRITE (TLL_READSER) which still allows
VMNT_READ locks. Thread B can't acquire a lock on the vnode because
thread A has it; Thread A can't upgrade its vmnt lock to VMNT_WRITE
(TLL_WRITE) because thread B has a VMNT_READ lock on it.
By serializing vmnt locks during path parsing, thread B can only
acquire a lock on vmp when thread A has completely finished its
operation.
2012-11-30 13:49:53 +01:00
|
|
|
if ((r = lock_vmnt(vmp, VMNT_READ)) != OK)
|
2012-11-14 14:24:53 +01:00
|
|
|
break;
|
2012-02-13 16:28:04 +01:00
|
|
|
if (vmp->m_dev != NO_DEV && vmp->m_fs_e != NONE &&
|
|
|
|
vmp->m_root_node != NULL) {
|
|
|
|
req_sync(vmp->m_fs_e);
|
|
|
|
}
|
2012-11-14 14:24:53 +01:00
|
|
|
unlock_vmnt(vmp);
|
2012-02-13 16:28:04 +01:00
|
|
|
}
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
return(r);
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
2005-07-01 19:58:29 +02:00
|
|
|
/*===========================================================================*
|
2005-09-11 18:45:46 +02:00
|
|
|
* do_fsync *
|
2005-07-01 19:58:29 +02:00
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int do_fsync()
|
2005-07-01 19:58:29 +02:00
|
|
|
{
|
2012-02-13 16:28:04 +01:00
|
|
|
/* Perform the fsync() system call. */
|
|
|
|
struct filp *rfilp;
|
|
|
|
struct vmnt *vmp;
|
|
|
|
dev_t dev;
|
|
|
|
int r = OK;
|
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
scratch(fp).file.fd_nr = job_m_in.fd;
|
|
|
|
|
|
|
|
if ((rfilp = get_filp(scratch(fp).file.fd_nr, VNODE_READ)) == NULL)
|
|
|
|
return(err_code);
|
VFS: fix locking bugs
.sync and fsync used unnecessarily restrictive locking type
.fsync violated locking order by obtaining a vmnt lock after a filp lock
.fsync contained a TOCTOU bug
.new_node violated locking rules (didn't upgrade lock upon file creation)
.do_pipe used unnecessarily restrictive locking type
.always lock pipes exclusively; even a read operation might require to do
a write on a vnode object (update pipe size)
.when opening a file with O_TRUNC, upgrade vnode lock when truncating
.utime used unnecessarily restrictive locking type
.path parsing:
.always acquire VMNT_WRITE or VMNT_EXCL on vmnt and downgrade to
VMNT_READ if that was what was actually requested. This prevents the
following deadlock scenario:
thread A:
lock_vmnt(vmp, TLL_READSER);
lock_vnode(vp, TLL_READSER);
upgrade_vmnt_lock(vmp, TLL_WRITE);
thread B:
lock_vmnt(vmp, TLL_READ);
lock_vnode(vp, TLL_READSER);
thread A will be stuck in upgrade_vmnt_lock and thread B is stuck in
lock_vnode. This happens when, for example, thread A tries create a
new node (open.c:new_node) and thread B tries to do eat_path to
change dir (stadir.c:do_chdir). When the path is being resolved, a
vnode is always locked with VNODE_OPCL (TLL_READSER) and then
downgraded to VNODE_READ if read-only is actually requested. Thread
A locks the vmnt with VMNT_WRITE (TLL_READSER) which still allows
VMNT_READ locks. Thread B can't acquire a lock on the vnode because
thread A has it; Thread A can't upgrade its vmnt lock to VMNT_WRITE
(TLL_WRITE) because thread B has a VMNT_READ lock on it.
By serializing vmnt locks during path parsing, thread B can only
acquire a lock on vmp when thread A has completely finished its
operation.
2012-11-30 13:49:53 +01:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
dev = rfilp->filp_vno->v_dev;
|
VFS: fix locking bugs
.sync and fsync used unnecessarily restrictive locking type
.fsync violated locking order by obtaining a vmnt lock after a filp lock
.fsync contained a TOCTOU bug
.new_node violated locking rules (didn't upgrade lock upon file creation)
.do_pipe used unnecessarily restrictive locking type
.always lock pipes exclusively; even a read operation might require to do
a write on a vnode object (update pipe size)
.when opening a file with O_TRUNC, upgrade vnode lock when truncating
.utime used unnecessarily restrictive locking type
.path parsing:
.always acquire VMNT_WRITE or VMNT_EXCL on vmnt and downgrade to
VMNT_READ if that was what was actually requested. This prevents the
following deadlock scenario:
thread A:
lock_vmnt(vmp, TLL_READSER);
lock_vnode(vp, TLL_READSER);
upgrade_vmnt_lock(vmp, TLL_WRITE);
thread B:
lock_vmnt(vmp, TLL_READ);
lock_vnode(vp, TLL_READSER);
thread A will be stuck in upgrade_vmnt_lock and thread B is stuck in
lock_vnode. This happens when, for example, thread A tries create a
new node (open.c:new_node) and thread B tries to do eat_path to
change dir (stadir.c:do_chdir). When the path is being resolved, a
vnode is always locked with VNODE_OPCL (TLL_READSER) and then
downgraded to VNODE_READ if read-only is actually requested. Thread
A locks the vmnt with VMNT_WRITE (TLL_READSER) which still allows
VMNT_READ locks. Thread B can't acquire a lock on the vnode because
thread A has it; Thread A can't upgrade its vmnt lock to VMNT_WRITE
(TLL_WRITE) because thread B has a VMNT_READ lock on it.
By serializing vmnt locks during path parsing, thread B can only
acquire a lock on vmp when thread A has completely finished its
operation.
2012-11-30 13:49:53 +01:00
|
|
|
unlock_filp(rfilp);
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp) {
|
VFS: fix locking bugs
.sync and fsync used unnecessarily restrictive locking type
.fsync violated locking order by obtaining a vmnt lock after a filp lock
.fsync contained a TOCTOU bug
.new_node violated locking rules (didn't upgrade lock upon file creation)
.do_pipe used unnecessarily restrictive locking type
.always lock pipes exclusively; even a read operation might require to do
a write on a vnode object (update pipe size)
.when opening a file with O_TRUNC, upgrade vnode lock when truncating
.utime used unnecessarily restrictive locking type
.path parsing:
.always acquire VMNT_WRITE or VMNT_EXCL on vmnt and downgrade to
VMNT_READ if that was what was actually requested. This prevents the
following deadlock scenario:
thread A:
lock_vmnt(vmp, TLL_READSER);
lock_vnode(vp, TLL_READSER);
upgrade_vmnt_lock(vmp, TLL_WRITE);
thread B:
lock_vmnt(vmp, TLL_READ);
lock_vnode(vp, TLL_READSER);
thread A will be stuck in upgrade_vmnt_lock and thread B is stuck in
lock_vnode. This happens when, for example, thread A tries create a
new node (open.c:new_node) and thread B tries to do eat_path to
change dir (stadir.c:do_chdir). When the path is being resolved, a
vnode is always locked with VNODE_OPCL (TLL_READSER) and then
downgraded to VNODE_READ if read-only is actually requested. Thread
A locks the vmnt with VMNT_WRITE (TLL_READSER) which still allows
VMNT_READ locks. Thread B can't acquire a lock on the vnode because
thread A has it; Thread A can't upgrade its vmnt lock to VMNT_WRITE
(TLL_WRITE) because thread B has a VMNT_READ lock on it.
By serializing vmnt locks during path parsing, thread B can only
acquire a lock on vmp when thread A has completely finished its
operation.
2012-11-30 13:49:53 +01:00
|
|
|
if (vmp->m_dev != dev) continue;
|
|
|
|
if ((r = lock_vmnt(vmp, VMNT_READ)) != OK)
|
|
|
|
break;
|
2012-02-13 16:28:04 +01:00
|
|
|
if (vmp->m_dev != NO_DEV && vmp->m_dev == dev &&
|
|
|
|
vmp->m_fs_e != NONE && vmp->m_root_node != NULL) {
|
|
|
|
|
|
|
|
req_sync(vmp->m_fs_e);
|
2009-04-29 18:59:18 +02:00
|
|
|
}
|
VFS: fix locking bugs
.sync and fsync used unnecessarily restrictive locking type
.fsync violated locking order by obtaining a vmnt lock after a filp lock
.fsync contained a TOCTOU bug
.new_node violated locking rules (didn't upgrade lock upon file creation)
.do_pipe used unnecessarily restrictive locking type
.always lock pipes exclusively; even a read operation might require to do
a write on a vnode object (update pipe size)
.when opening a file with O_TRUNC, upgrade vnode lock when truncating
.utime used unnecessarily restrictive locking type
.path parsing:
.always acquire VMNT_WRITE or VMNT_EXCL on vmnt and downgrade to
VMNT_READ if that was what was actually requested. This prevents the
following deadlock scenario:
thread A:
lock_vmnt(vmp, TLL_READSER);
lock_vnode(vp, TLL_READSER);
upgrade_vmnt_lock(vmp, TLL_WRITE);
thread B:
lock_vmnt(vmp, TLL_READ);
lock_vnode(vp, TLL_READSER);
thread A will be stuck in upgrade_vmnt_lock and thread B is stuck in
lock_vnode. This happens when, for example, thread A tries create a
new node (open.c:new_node) and thread B tries to do eat_path to
change dir (stadir.c:do_chdir). When the path is being resolved, a
vnode is always locked with VNODE_OPCL (TLL_READSER) and then
downgraded to VNODE_READ if read-only is actually requested. Thread
A locks the vmnt with VMNT_WRITE (TLL_READSER) which still allows
VMNT_READ locks. Thread B can't acquire a lock on the vnode because
thread A has it; Thread A can't upgrade its vmnt lock to VMNT_WRITE
(TLL_WRITE) because thread B has a VMNT_READ lock on it.
By serializing vmnt locks during path parsing, thread B can only
acquire a lock on vmp when thread A has completely finished its
operation.
2012-11-30 13:49:53 +01:00
|
|
|
unlock_vmnt(vmp);
|
2009-04-29 18:59:18 +02:00
|
|
|
}
|
2012-02-13 16:28:04 +01:00
|
|
|
|
|
|
|
return(r);
|
2009-04-29 18:59:18 +02:00
|
|
|
}
|
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/*===========================================================================*
|
2006-05-11 16:57:23 +02:00
|
|
|
* pm_reboot *
|
2005-04-21 16:53:53 +02:00
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
void pm_reboot()
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
2012-11-14 14:18:16 +01:00
|
|
|
/* Perform the VFS side of the reboot call. */
|
2005-04-21 16:53:53 +02:00
|
|
|
int i;
|
2012-02-13 16:28:04 +01:00
|
|
|
struct fproc *rfp;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2009-01-26 18:43:59 +01:00
|
|
|
do_sync();
|
|
|
|
|
2012-11-14 14:18:16 +01:00
|
|
|
/* Do exit processing for all leftover processes and servers, but don't
|
|
|
|
* actually exit them (if they were really gone, PM will tell us about it).
|
|
|
|
* Skip processes that handle parts of the file system; we first need to give
|
|
|
|
* them the chance to unmount (which should be possible as all normal
|
|
|
|
* processes have no open files anymore).
|
2006-03-15 16:34:12 +01:00
|
|
|
*/
|
2012-02-13 16:28:04 +01:00
|
|
|
for (i = 0; i < NR_PROCS; i++) {
|
|
|
|
rfp = &fproc[i];
|
|
|
|
|
2012-11-14 14:18:16 +01:00
|
|
|
/* Don't just free the proc right away, but let it finish what it was
|
|
|
|
* doing first */
|
|
|
|
lock_proc(rfp, 0);
|
|
|
|
if (rfp->fp_endpoint != NONE && find_vmnt(rfp->fp_endpoint) == NULL)
|
|
|
|
free_proc(rfp, 0);
|
|
|
|
unlock_proc(rfp);
|
|
|
|
}
|
|
|
|
|
|
|
|
do_sync();
|
|
|
|
unmount_all(0 /* Don't force */);
|
|
|
|
|
|
|
|
/* Try to exit all processes again including File Servers */
|
|
|
|
for (i = 0; i < NR_PROCS; i++) {
|
|
|
|
rfp = &fproc[i];
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* Don't just free the proc right away, but let it finish what it was
|
|
|
|
* doing first */
|
|
|
|
lock_proc(rfp, 0);
|
2012-05-02 17:41:17 +02:00
|
|
|
if (rfp->fp_endpoint != NONE)
|
|
|
|
free_proc(rfp, 0);
|
2012-02-13 16:28:04 +01:00
|
|
|
unlock_proc(rfp);
|
|
|
|
}
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
do_sync();
|
2012-11-14 14:18:16 +01:00
|
|
|
unmount_all(1 /* Force */);
|
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*===========================================================================*
|
2006-05-11 16:57:23 +02:00
|
|
|
* pm_fork *
|
2005-04-21 16:53:53 +02:00
|
|
|
*===========================================================================*/
|
2012-04-13 14:50:38 +02:00
|
|
|
void pm_fork(endpoint_t pproc, endpoint_t cproc, pid_t cpid)
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
|
|
|
/* Perform those aspects of the fork() system call that relate to files.
|
|
|
|
* In particular, let the child inherit its parent's file descriptors.
|
|
|
|
* The parent and child parameters tell who forked off whom. The file
|
2010-01-05 20:39:27 +01:00
|
|
|
* system uses the same slot numbers as the kernel. Only PM makes this call.
|
2005-04-21 16:53:53 +02:00
|
|
|
*/
|
|
|
|
|
2012-04-13 14:50:38 +02:00
|
|
|
struct fproc *cp, *pp;
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
int i, parentno, childno;
|
2012-02-13 16:28:04 +01:00
|
|
|
mutex_t c_fp_lock;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
/* Check up-to-dateness of fproc. */
|
2006-05-11 16:57:23 +02:00
|
|
|
okendpt(pproc, &parentno);
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
|
|
|
|
/* PM gives child endpoint, which implies process slot information.
|
|
|
|
* Don't call isokendpt, because that will verify if the endpoint
|
|
|
|
* number is correct in fproc, which it won't be.
|
|
|
|
*/
|
2006-05-11 16:57:23 +02:00
|
|
|
childno = _ENDPOINT_P(cproc);
|
2012-02-13 16:28:04 +01:00
|
|
|
if (childno < 0 || childno >= NR_PROCS)
|
2012-04-13 14:50:38 +02:00
|
|
|
panic("VFS: bogus child for forking: %d", cproc);
|
2012-02-13 16:28:04 +01:00
|
|
|
if (fproc[childno].fp_pid != PID_FREE)
|
|
|
|
panic("VFS: forking on top of in-use child: %d", childno);
|
2005-04-21 16:53:53 +02:00
|
|
|
|
|
|
|
/* Copy the parent's fproc struct to the child. */
|
2012-02-13 16:28:04 +01:00
|
|
|
/* However, the mutex variables belong to a slot and must stay the same. */
|
|
|
|
c_fp_lock = fproc[childno].fp_lock;
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
fproc[childno] = fproc[parentno];
|
2012-02-13 16:28:04 +01:00
|
|
|
fproc[childno].fp_lock = c_fp_lock;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
|
|
|
/* Increase the counters in the 'filp' table. */
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
cp = &fproc[childno];
|
2012-02-13 16:28:04 +01:00
|
|
|
pp = &fproc[parentno];
|
2009-04-29 18:59:18 +02:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
for (i = 0; i < OPEN_MAX; i++)
|
2010-05-10 15:26:00 +02:00
|
|
|
if (cp->fp_filp[i] != NULL) cp->fp_filp[i]->filp_count++;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
/* Fill in new process and endpoint id. */
|
2006-05-11 16:57:23 +02:00
|
|
|
cp->fp_pid = cpid;
|
|
|
|
cp->fp_endpoint = cproc;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* A forking process never has an outstanding grant, as it isn't blocking on
|
|
|
|
* I/O. */
|
2012-04-13 14:50:38 +02:00
|
|
|
if (GRANT_VALID(pp->fp_grant)) {
|
2012-02-13 16:28:04 +01:00
|
|
|
panic("VFS: fork: pp (endpoint %d) has grant %d\n", pp->fp_endpoint,
|
|
|
|
pp->fp_grant);
|
2008-11-19 13:26:10 +01:00
|
|
|
}
|
2012-04-13 14:50:38 +02:00
|
|
|
if (GRANT_VALID(cp->fp_grant)) {
|
2012-02-13 16:28:04 +01:00
|
|
|
panic("VFS: fork: cp (endpoint %d) has grant %d\n", cp->fp_endpoint,
|
|
|
|
cp->fp_grant);
|
2008-11-19 13:26:10 +01:00
|
|
|
}
|
2006-06-20 12:12:09 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* A child is not a process leader, not being revived, etc. */
|
|
|
|
cp->fp_flags = FP_NOFLAGS;
|
2005-10-20 21:39:32 +02:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Record the fact that both root and working dir have another user. */
|
2012-02-13 16:28:04 +01:00
|
|
|
if (cp->fp_rd) dup_vnode(cp->fp_rd);
|
|
|
|
if (cp->fp_wd) dup_vnode(cp->fp_wd);
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*===========================================================================*
|
2006-03-15 16:34:12 +01:00
|
|
|
* free_proc *
|
2005-04-21 16:53:53 +02:00
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
static void free_proc(struct fproc *exiter, int flags)
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
2009-09-22 23:48:26 +02:00
|
|
|
int i;
|
2005-04-21 16:53:53 +02:00
|
|
|
register struct fproc *rfp;
|
|
|
|
register struct filp *rfilp;
|
2006-10-25 15:40:36 +02:00
|
|
|
register struct vnode *vp;
|
2005-04-21 16:53:53 +02:00
|
|
|
dev_t dev;
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if (exiter->fp_endpoint == NONE)
|
2010-03-05 16:05:11 +01:00
|
|
|
panic("free_proc: already free");
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if (fp_is_blocked(exiter))
|
|
|
|
unpause(exiter->fp_endpoint);
|
2009-05-08 15:56:41 +02:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
/* Loop on file descriptors, closing any that are open. */
|
|
|
|
for (i = 0; i < OPEN_MAX; i++) {
|
2012-02-13 16:28:04 +01:00
|
|
|
(void) close_fd(exiter, i);
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
2012-02-13 16:28:04 +01:00
|
|
|
|
|
|
|
/* Release root and working directories. */
|
|
|
|
if (exiter->fp_rd) { put_vnode(exiter->fp_rd); exiter->fp_rd = NULL; }
|
|
|
|
if (exiter->fp_wd) { put_vnode(exiter->fp_wd); exiter->fp_wd = NULL; }
|
|
|
|
|
|
|
|
/* The rest of these actions is only done when processes actually exit. */
|
|
|
|
if (!(flags & FP_EXITING)) return;
|
|
|
|
|
|
|
|
exiter->fp_flags |= FP_EXITING;
|
|
|
|
|
2005-10-20 21:39:32 +02:00
|
|
|
/* Check if any process is SUSPENDed on this driver.
|
|
|
|
* If a driver exits, unmap its entries in the dmap table.
|
|
|
|
* (unmapping has to be done after the first step, because the
|
|
|
|
* dmap table is used in the first step.)
|
2005-10-12 17:01:23 +02:00
|
|
|
*/
|
2012-02-13 16:28:04 +01:00
|
|
|
unsuspend_by_endpt(exiter->fp_endpoint);
|
|
|
|
dmap_unmap_by_endpt(exiter->fp_endpoint);
|
2009-04-29 18:59:18 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
worker_stop_by_endpt(exiter->fp_endpoint); /* Unblock waiting threads */
|
|
|
|
vmnt_unmap_by_endpt(exiter->fp_endpoint); /* Invalidate open files if this
|
|
|
|
* was an active FS */
|
2006-03-15 16:34:12 +01:00
|
|
|
|
endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).
In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)
pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.
message field names have changed.
fs drivers are endpoints.
fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)
fproc[].fp_task (indicating which driver the process is suspended on)
became an int.
PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.
More return code checks of sys_* functions have been added.
IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.
Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.
PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.
PM now sys_exit()s itself on panic(), instead of sys_abort().
RS also talks in endpoints instead of process numbers.
2006-03-03 11:20:58 +01:00
|
|
|
/* Invalidate endpoint number for error and sanity checks. */
|
2012-02-13 16:28:04 +01:00
|
|
|
exiter->fp_endpoint = NONE;
|
2005-10-05 17:38:15 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* If a session leader exits and it has a controlling tty, then revoke
|
2006-03-10 17:10:05 +01:00
|
|
|
* access to its controlling tty from all other processes using it.
|
2005-04-21 16:53:53 +02:00
|
|
|
*/
|
2012-02-13 16:28:04 +01:00
|
|
|
if ((exiter->fp_flags & FP_SESLDR) && exiter->fp_tty != 0) {
|
|
|
|
dev = exiter->fp_tty;
|
2006-03-10 17:10:05 +01:00
|
|
|
for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {
|
2006-03-15 16:34:12 +01:00
|
|
|
if(rfp->fp_pid == PID_FREE) continue;
|
2006-03-10 17:10:05 +01:00
|
|
|
if (rfp->fp_tty == dev) rfp->fp_tty = 0;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2006-03-10 17:10:05 +01:00
|
|
|
for (i = 0; i < OPEN_MAX; i++) {
|
2010-05-10 15:26:00 +02:00
|
|
|
if ((rfilp = rfp->fp_filp[i]) == NULL) continue;
|
2005-04-21 16:53:53 +02:00
|
|
|
if (rfilp->filp_mode == FILP_CLOSED) continue;
|
2006-10-25 15:40:36 +02:00
|
|
|
vp = rfilp->filp_vno;
|
2012-04-25 14:44:42 +02:00
|
|
|
if (!S_ISCHR(vp->v_mode)) continue;
|
2006-10-25 15:40:36 +02:00
|
|
|
if ((dev_t) vp->v_sdev != dev) continue;
|
2012-02-13 16:28:04 +01:00
|
|
|
lock_filp(rfilp, VNODE_READ);
|
|
|
|
(void) dev_close(dev, rfilp-filp); /* Ignore any errors, even
|
|
|
|
* SUSPEND. */
|
2008-02-22 15:49:02 +01:00
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
rfilp->filp_mode = FILP_CLOSED;
|
2012-02-13 16:28:04 +01:00
|
|
|
unlock_filp(rfilp);
|
2006-03-10 17:10:05 +01:00
|
|
|
}
|
|
|
|
}
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
2006-03-10 17:10:05 +01:00
|
|
|
/* Exit done. Mark slot as free. */
|
2012-02-13 16:28:04 +01:00
|
|
|
exiter->fp_pid = PID_FREE;
|
|
|
|
if (exiter->fp_flags & FP_PENDING)
|
|
|
|
pending--; /* No longer pending job, not going to do it */
|
|
|
|
exiter->fp_flags = FP_NOFLAGS;
|
2006-03-15 16:34:12 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/*===========================================================================*
|
2006-05-11 16:57:23 +02:00
|
|
|
* pm_exit *
|
2006-03-15 16:34:12 +01:00
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
void pm_exit(proc)
|
2006-05-11 16:57:23 +02:00
|
|
|
int proc;
|
2006-03-15 16:34:12 +01:00
|
|
|
{
|
|
|
|
/* Perform the file system portion of the exit(status) system call. */
|
2012-02-13 16:28:04 +01:00
|
|
|
int exitee_p;
|
2006-03-15 16:34:12 +01:00
|
|
|
|
|
|
|
/* Nevertheless, pretend that the call came from the user. */
|
2006-05-11 16:57:23 +02:00
|
|
|
okendpt(proc, &exitee_p);
|
2012-02-13 16:28:04 +01:00
|
|
|
fp = &fproc[exitee_p];
|
|
|
|
free_proc(fp, FP_EXITING);
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*===========================================================================*
|
2006-05-11 16:57:23 +02:00
|
|
|
* pm_setgid *
|
2005-04-21 16:53:53 +02:00
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
void pm_setgid(proc_e, egid, rgid)
|
2006-05-11 16:57:23 +02:00
|
|
|
int proc_e;
|
|
|
|
int egid;
|
|
|
|
int rgid;
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
2006-05-11 16:57:23 +02:00
|
|
|
register struct fproc *tfp;
|
|
|
|
int slot;
|
|
|
|
|
|
|
|
okendpt(proc_e, &slot);
|
|
|
|
tfp = &fproc[slot];
|
|
|
|
|
|
|
|
tfp->fp_effgid = egid;
|
|
|
|
tfp->fp_realgid = rgid;
|
|
|
|
}
|
|
|
|
|
2005-04-21 16:53:53 +02:00
|
|
|
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
/*===========================================================================*
|
|
|
|
* pm_setgroups *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
void pm_setgroups(proc_e, ngroups, groups)
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
int proc_e;
|
|
|
|
int ngroups;
|
|
|
|
gid_t *groups;
|
|
|
|
{
|
|
|
|
struct fproc *rfp;
|
2010-04-01 15:25:05 +02:00
|
|
|
int slot;
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
|
|
|
|
okendpt(proc_e, &slot);
|
|
|
|
rfp = &fproc[slot];
|
|
|
|
if (ngroups * sizeof(gid_t) > sizeof(rfp->fp_sgroups))
|
2012-02-13 16:28:04 +01:00
|
|
|
panic("VFS: pm_setgroups: too much data to copy");
|
|
|
|
if (sys_datacopy(who_e, (vir_bytes) groups, SELF, (vir_bytes) rfp->fp_sgroups,
|
|
|
|
ngroups * sizeof(gid_t)) == OK) {
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
rfp->fp_ngroups = ngroups;
|
|
|
|
} else
|
2012-02-13 16:28:04 +01:00
|
|
|
panic("VFS: pm_setgroups: datacopy failed");
|
- Introduce support for sticky bit.
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
2009-12-20 21:27:14 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2006-05-11 16:57:23 +02:00
|
|
|
/*===========================================================================*
|
|
|
|
* pm_setuid *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
void pm_setuid(proc_e, euid, ruid)
|
2006-05-11 16:57:23 +02:00
|
|
|
int proc_e;
|
|
|
|
int euid;
|
|
|
|
int ruid;
|
|
|
|
{
|
2012-02-13 16:28:04 +01:00
|
|
|
struct fproc *tfp;
|
2006-05-11 16:57:23 +02:00
|
|
|
int slot;
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2006-05-11 16:57:23 +02:00
|
|
|
okendpt(proc_e, &slot);
|
|
|
|
tfp = &fproc[slot];
|
2005-04-21 16:53:53 +02:00
|
|
|
|
2006-05-11 16:57:23 +02:00
|
|
|
tfp->fp_effuid = euid;
|
|
|
|
tfp->fp_realuid = ruid;
|
2005-04-21 16:53:53 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*===========================================================================*
|
|
|
|
* do_svrctl *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int do_svrctl()
|
2005-04-21 16:53:53 +02:00
|
|
|
{
|
2012-04-02 17:25:37 +02:00
|
|
|
unsigned int svrctl;
|
2012-03-30 11:24:44 +02:00
|
|
|
vir_bytes ptr;
|
2012-04-13 14:50:38 +02:00
|
|
|
|
2012-03-30 11:24:44 +02:00
|
|
|
svrctl = job_m_in.svrctl_req;
|
|
|
|
ptr = (vir_bytes) job_m_in.svrctl_argp;
|
|
|
|
if (((svrctl >> 8) & 0xFF) != 'M') return(EINVAL);
|
2012-04-13 14:50:38 +02:00
|
|
|
|
|
|
|
switch (svrctl) {
|
2012-03-30 11:24:44 +02:00
|
|
|
case VFSSETPARAM:
|
|
|
|
case VFSGETPARAM:
|
|
|
|
{
|
|
|
|
struct sysgetenv sysgetenv;
|
|
|
|
char search_key[64];
|
|
|
|
char val[64];
|
|
|
|
int r, s;
|
|
|
|
|
|
|
|
/* Copy sysgetenv structure to VFS */
|
|
|
|
if (sys_datacopy(who_e, ptr, SELF, (vir_bytes) &sysgetenv,
|
|
|
|
sizeof(sysgetenv)) != OK)
|
|
|
|
return(EFAULT);
|
|
|
|
|
|
|
|
/* Basic sanity checking */
|
|
|
|
if (svrctl == VFSSETPARAM) {
|
|
|
|
if (sysgetenv.keylen <= 0 ||
|
|
|
|
sysgetenv.keylen > (sizeof(search_key) - 1) ||
|
|
|
|
sysgetenv.vallen <= 0 ||
|
|
|
|
sysgetenv.vallen >= sizeof(val)) {
|
|
|
|
return(EINVAL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Copy parameter "key" */
|
|
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
|
|
|
|
SELF, (vir_bytes) search_key,
|
|
|
|
sysgetenv.keylen)) != OK)
|
|
|
|
return(s);
|
|
|
|
search_key[sysgetenv.keylen] = '\0'; /* Limit string */
|
|
|
|
|
|
|
|
/* Is it a parameter we know? */
|
|
|
|
if (svrctl == VFSSETPARAM) {
|
|
|
|
if (!strcmp(search_key, "verbose")) {
|
|
|
|
int verbose_val;
|
|
|
|
if ((s = sys_datacopy(who_e,
|
|
|
|
(vir_bytes) sysgetenv.val, SELF,
|
|
|
|
(vir_bytes) &val, sysgetenv.vallen)) != OK)
|
|
|
|
return(s);
|
|
|
|
val[sysgetenv.vallen] = '\0'; /* Limit string */
|
|
|
|
verbose_val = atoi(val);
|
|
|
|
if (verbose_val < 0 || verbose_val > 4) {
|
|
|
|
return(EINVAL);
|
|
|
|
}
|
|
|
|
verbose = verbose_val;
|
|
|
|
r = OK;
|
|
|
|
} else {
|
|
|
|
r = ESRCH;
|
|
|
|
}
|
|
|
|
} else { /* VFSGETPARAM */
|
2012-04-02 17:25:37 +02:00
|
|
|
char small_buf[60];
|
|
|
|
|
|
|
|
r = ESRCH;
|
2012-03-30 11:24:44 +02:00
|
|
|
if (!strcmp(search_key, "print_traces")) {
|
|
|
|
mthread_stacktraces();
|
|
|
|
sysgetenv.val = 0;
|
|
|
|
sysgetenv.vallen = 0;
|
|
|
|
r = OK;
|
2012-04-02 17:25:37 +02:00
|
|
|
} else if (!strcmp(search_key, "active_threads")) {
|
|
|
|
int active = NR_WTHREADS - worker_available();
|
2012-07-13 18:08:06 +02:00
|
|
|
snprintf(small_buf, sizeof(small_buf) - 1,
|
|
|
|
"%d", active);
|
2012-04-02 17:25:37 +02:00
|
|
|
sysgetenv.vallen = strlen(small_buf);
|
|
|
|
r = OK;
|
2012-03-30 11:24:44 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
if (r == OK) {
|
|
|
|
if ((s = sys_datacopy(SELF,
|
|
|
|
(vir_bytes) &sysgetenv, who_e, ptr,
|
|
|
|
sizeof(sysgetenv))) != OK)
|
|
|
|
return(s);
|
2012-04-02 17:25:37 +02:00
|
|
|
if (sysgetenv.val != 0) {
|
|
|
|
if ((s = sys_datacopy(SELF,
|
|
|
|
(vir_bytes) small_buf, who_e,
|
|
|
|
(vir_bytes) sysgetenv.val,
|
|
|
|
sysgetenv.vallen)) != OK)
|
|
|
|
return(s);
|
|
|
|
}
|
2012-03-30 11:24:44 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return(r);
|
|
|
|
}
|
2012-02-13 16:28:04 +01:00
|
|
|
default:
|
2005-04-21 16:53:53 +02:00
|
|
|
return(EINVAL);
|
|
|
|
}
|
|
|
|
}
|
2006-05-11 16:57:23 +02:00
|
|
|
|
|
|
|
/*===========================================================================*
|
|
|
|
* pm_dumpcore *
|
|
|
|
*===========================================================================*/
|
2012-03-25 20:25:53 +02:00
|
|
|
int pm_dumpcore(endpoint_t proc_e, int csig, vir_bytes exe_name)
|
2006-05-11 16:57:23 +02:00
|
|
|
{
|
2012-09-19 16:57:27 +02:00
|
|
|
int slot, r = OK, core_fd;
|
2012-02-13 16:28:04 +01:00
|
|
|
struct filp *f;
|
|
|
|
char core_path[PATH_MAX];
|
|
|
|
char proc_name[PROC_NAME_LEN];
|
2011-07-30 08:03:23 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
okendpt(proc_e, &slot);
|
|
|
|
fp = &fproc[slot];
|
2011-07-30 08:03:23 +02:00
|
|
|
|
2012-12-11 02:53:25 +01:00
|
|
|
/* if a process is blocked, scratch(fp).file.fd_nr holds the fd it's blocked
|
|
|
|
* on. free it up for use by common_open().
|
|
|
|
*/
|
|
|
|
if (fp_is_blocked(fp))
|
|
|
|
unpause(fp->fp_endpoint);
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* open core file */
|
|
|
|
snprintf(core_path, PATH_MAX, "%s.%d", CORE_NAME, fp->fp_pid);
|
|
|
|
core_fd = common_open(core_path, O_WRONLY | O_CREAT | O_TRUNC, CORE_MODE);
|
2012-09-19 16:57:27 +02:00
|
|
|
if (core_fd < 0) { r = core_fd; goto core_exit; }
|
2011-07-30 08:03:23 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* get process' name */
|
|
|
|
r = sys_datacopy(PM_PROC_NR, exe_name, VFS_PROC_NR, (vir_bytes) proc_name,
|
|
|
|
PROC_NAME_LEN);
|
2012-09-19 16:57:27 +02:00
|
|
|
if (r != OK) goto core_exit;
|
2012-02-13 16:28:04 +01:00
|
|
|
proc_name[PROC_NAME_LEN - 1] = '\0';
|
2011-07-30 08:03:23 +02:00
|
|
|
|
2012-09-19 16:57:27 +02:00
|
|
|
if ((f = get_filp(core_fd, VNODE_WRITE)) == NULL) { r=EBADF; goto core_exit; }
|
2012-02-13 16:28:04 +01:00
|
|
|
write_elf_core_file(f, csig, proc_name);
|
|
|
|
unlock_filp(f);
|
|
|
|
(void) close_fd(fp, core_fd); /* ignore failure, we're exiting anyway */
|
2011-07-30 08:03:23 +02:00
|
|
|
|
2012-09-19 16:57:27 +02:00
|
|
|
core_exit:
|
2012-06-15 02:38:00 +02:00
|
|
|
if(csig)
|
|
|
|
free_proc(fp, FP_EXITING);
|
2012-09-19 16:57:27 +02:00
|
|
|
return(r);
|
2006-05-11 16:57:23 +02:00
|
|
|
}
|
|
|
|
|
2010-04-08 15:41:35 +02:00
|
|
|
/*===========================================================================*
|
|
|
|
* ds_event *
|
|
|
|
*===========================================================================*/
|
VFS: make all IPC asynchronous
By decoupling synchronous drivers from VFS, we are a big step closer to
supporting driver crashes under all circumstances. That is, VFS can't
become stuck on IPC with a synchronous driver (e.g., INET) and can
recover from crashing block drivers during open/close/ioctl or during
communication with an FS.
In order to maintain serialized communication with a synchronous driver,
the communication is wrapped by a mutex on a per driver basis (not major
numbers as there can be multiple majors with identical endpoints). Majors
that share a driver endpoint point to a single mutex object.
In order to support crashes from block drivers, the file reopen tactic
had to be changed; first reopen files associated with the crashed
driver, then send the new driver endpoint to FSes. This solves a
deadlock between the FS and the block driver;
- VFS would send REQ_NEW_DRIVER to an FS, but he FS only receives it
after retrying the current request to the newly started driver.
- The block driver would refuse the retried request until all files
had been reopened.
- VFS would reopen files only after getting a reply from the initial
REQ_NEW_DRIVER.
When a character special driver crashes, all associated files have to
be marked invalid and closed (or reopened if flagged as such). However,
they can only be closed if a thread holds exclusive access to it. To
obtain exclusive access, the worker thread (which handles the new driver
endpoint event from DS) schedules a new job to garbage collect invalid
files. This way, we can signal the worker thread that was talking to the
crashed driver and will release exclusive access to a file associated
with the crashed driver and prevent the garbage collecting worker thread
from dead locking on that file.
Also, when a character special driver crashes, RS will unmap the driver
and remap it upon restart. During unmapping, associated files are marked
invalid instead of waiting for an endpoint up event from DS, as that
event might come later than new read/write/select requests and thus
cause confusion in the freshly started driver.
When locking a filp, the usage counters are no longer checked. The usage
counter can legally go down to zero during filp invalidation while there
are locks pending.
DS events are handled by a separate worker thread instead of the main
thread as reopening files could lead to another crash and a stuck thread.
An additional worker thread is then necessary to unlock it.
Finally, with everything asynchronous a race condition in do_select
surfaced. A select entry was only marked in use after succesfully sending
initial select requests to drivers and having to wait. When multiple
select() calls were handled there was opportunity that these entries
were overwritten. This had as effect that some select results were
ignored (and select() remained blocking instead if returning) or do_select
tried to access filps that were not present (because thrown away by
secondary select()). This bug manifested itself with sendrecs, but was
very hard to reproduce. However, it became awfully easy to trigger with
asynsends only.
2012-08-28 16:06:51 +02:00
|
|
|
void *
|
|
|
|
ds_event(void *arg)
|
2010-04-08 15:41:35 +02:00
|
|
|
{
|
2012-02-13 16:28:04 +01:00
|
|
|
char key[DS_MAX_KEYLEN];
|
|
|
|
char *blkdrv_prefix = "drv.blk.";
|
|
|
|
char *chrdrv_prefix = "drv.chr.";
|
|
|
|
u32_t value;
|
|
|
|
int type, r, is_blk;
|
|
|
|
endpoint_t owner_endpoint;
|
|
|
|
|
VFS: make all IPC asynchronous
By decoupling synchronous drivers from VFS, we are a big step closer to
supporting driver crashes under all circumstances. That is, VFS can't
become stuck on IPC with a synchronous driver (e.g., INET) and can
recover from crashing block drivers during open/close/ioctl or during
communication with an FS.
In order to maintain serialized communication with a synchronous driver,
the communication is wrapped by a mutex on a per driver basis (not major
numbers as there can be multiple majors with identical endpoints). Majors
that share a driver endpoint point to a single mutex object.
In order to support crashes from block drivers, the file reopen tactic
had to be changed; first reopen files associated with the crashed
driver, then send the new driver endpoint to FSes. This solves a
deadlock between the FS and the block driver;
- VFS would send REQ_NEW_DRIVER to an FS, but he FS only receives it
after retrying the current request to the newly started driver.
- The block driver would refuse the retried request until all files
had been reopened.
- VFS would reopen files only after getting a reply from the initial
REQ_NEW_DRIVER.
When a character special driver crashes, all associated files have to
be marked invalid and closed (or reopened if flagged as such). However,
they can only be closed if a thread holds exclusive access to it. To
obtain exclusive access, the worker thread (which handles the new driver
endpoint event from DS) schedules a new job to garbage collect invalid
files. This way, we can signal the worker thread that was talking to the
crashed driver and will release exclusive access to a file associated
with the crashed driver and prevent the garbage collecting worker thread
from dead locking on that file.
Also, when a character special driver crashes, RS will unmap the driver
and remap it upon restart. During unmapping, associated files are marked
invalid instead of waiting for an endpoint up event from DS, as that
event might come later than new read/write/select requests and thus
cause confusion in the freshly started driver.
When locking a filp, the usage counters are no longer checked. The usage
counter can legally go down to zero during filp invalidation while there
are locks pending.
DS events are handled by a separate worker thread instead of the main
thread as reopening files could lead to another crash and a stuck thread.
An additional worker thread is then necessary to unlock it.
Finally, with everything asynchronous a race condition in do_select
surfaced. A select entry was only marked in use after succesfully sending
initial select requests to drivers and having to wait. When multiple
select() calls were handled there was opportunity that these entries
were overwritten. This had as effect that some select results were
ignored (and select() remained blocking instead if returning) or do_select
tried to access filps that were not present (because thrown away by
secondary select()). This bug manifested itself with sendrecs, but was
very hard to reproduce. However, it became awfully easy to trigger with
asynsends only.
2012-08-28 16:06:51 +02:00
|
|
|
struct job my_job;
|
|
|
|
|
|
|
|
my_job = *((struct job *) arg);
|
|
|
|
fp = my_job.j_fp;
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
/* Get the event and the owner from DS. */
|
|
|
|
while ((r = ds_check(key, &type, &owner_endpoint)) == OK) {
|
Split block/character protocols and libdriver
This patch separates the character and block driver communication
protocols. The old character protocol remains the same, but a new
block protocol is introduced. The libdriver library is replaced by
two new libraries: libchardriver and libblockdriver. Their exposed
API, and drivers that use them, have been updated accordingly.
Together, libbdev and libblockdriver now completely abstract away
the message format used by the block protocol. As the memory driver
is both a character and a block device driver, it now implements its
own message loop.
The most important semantic change made to the block protocol is that
it is no longer possible to return both partial results and an error
for a single transfer. This simplifies the interaction between the
caller and the driver, as the I/O vector no longer needs to be copied
back. Also, drivers are now no longer supposed to decide based on the
layout of the I/O vector when a transfer should be cut short. Put
simply, transfers are now supposed to either succeed completely, or
result in an error.
After this patch, the state of the various pieces is as follows:
- block protocol: stable
- libbdev API: stable for synchronous communication
- libblockdriver API: needs slight revision (the drvlib/partition API
in particular; the threading API will also change shortly)
- character protocol: needs cleanup
- libchardriver API: needs cleanup accordingly
- driver restarts: largely unsupported until endpoint changes are
reintroduced
As a side effect, this patch eliminates several bugs, hacks, and gcc
-Wall and -W warnings all over the place. It probably introduces a
few new ones, too.
Update warning: this patch changes the protocol between MFS and disk
drivers, so in order to use old/new images, the MFS from the ramdisk
must be used to mount all file systems.
2011-11-22 13:27:53 +01:00
|
|
|
/* Only check for block and character driver up events. */
|
|
|
|
if (!strncmp(key, blkdrv_prefix, strlen(blkdrv_prefix))) {
|
|
|
|
is_blk = TRUE;
|
|
|
|
} else if (!strncmp(key, chrdrv_prefix, strlen(chrdrv_prefix))) {
|
|
|
|
is_blk = FALSE;
|
|
|
|
} else {
|
2012-02-13 16:28:04 +01:00
|
|
|
continue;
|
Split block/character protocols and libdriver
This patch separates the character and block driver communication
protocols. The old character protocol remains the same, but a new
block protocol is introduced. The libdriver library is replaced by
two new libraries: libchardriver and libblockdriver. Their exposed
API, and drivers that use them, have been updated accordingly.
Together, libbdev and libblockdriver now completely abstract away
the message format used by the block protocol. As the memory driver
is both a character and a block device driver, it now implements its
own message loop.
The most important semantic change made to the block protocol is that
it is no longer possible to return both partial results and an error
for a single transfer. This simplifies the interaction between the
caller and the driver, as the I/O vector no longer needs to be copied
back. Also, drivers are now no longer supposed to decide based on the
layout of the I/O vector when a transfer should be cut short. Put
simply, transfers are now supposed to either succeed completely, or
result in an error.
After this patch, the state of the various pieces is as follows:
- block protocol: stable
- libbdev API: stable for synchronous communication
- libblockdriver API: needs slight revision (the drvlib/partition API
in particular; the threading API will also change shortly)
- character protocol: needs cleanup
- libchardriver API: needs cleanup accordingly
- driver restarts: largely unsupported until endpoint changes are
reintroduced
As a side effect, this patch eliminates several bugs, hacks, and gcc
-Wall and -W warnings all over the place. It probably introduces a
few new ones, too.
Update warning: this patch changes the protocol between MFS and disk
drivers, so in order to use old/new images, the MFS from the ramdisk
must be used to mount all file systems.
2011-11-22 13:27:53 +01:00
|
|
|
}
|
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if ((r = ds_retrieve_u32(key, &value)) != OK) {
|
|
|
|
printf("VFS: ds_event: ds_retrieve_u32 failed\n");
|
VFS: make all IPC asynchronous
By decoupling synchronous drivers from VFS, we are a big step closer to
supporting driver crashes under all circumstances. That is, VFS can't
become stuck on IPC with a synchronous driver (e.g., INET) and can
recover from crashing block drivers during open/close/ioctl or during
communication with an FS.
In order to maintain serialized communication with a synchronous driver,
the communication is wrapped by a mutex on a per driver basis (not major
numbers as there can be multiple majors with identical endpoints). Majors
that share a driver endpoint point to a single mutex object.
In order to support crashes from block drivers, the file reopen tactic
had to be changed; first reopen files associated with the crashed
driver, then send the new driver endpoint to FSes. This solves a
deadlock between the FS and the block driver;
- VFS would send REQ_NEW_DRIVER to an FS, but he FS only receives it
after retrying the current request to the newly started driver.
- The block driver would refuse the retried request until all files
had been reopened.
- VFS would reopen files only after getting a reply from the initial
REQ_NEW_DRIVER.
When a character special driver crashes, all associated files have to
be marked invalid and closed (or reopened if flagged as such). However,
they can only be closed if a thread holds exclusive access to it. To
obtain exclusive access, the worker thread (which handles the new driver
endpoint event from DS) schedules a new job to garbage collect invalid
files. This way, we can signal the worker thread that was talking to the
crashed driver and will release exclusive access to a file associated
with the crashed driver and prevent the garbage collecting worker thread
from dead locking on that file.
Also, when a character special driver crashes, RS will unmap the driver
and remap it upon restart. During unmapping, associated files are marked
invalid instead of waiting for an endpoint up event from DS, as that
event might come later than new read/write/select requests and thus
cause confusion in the freshly started driver.
When locking a filp, the usage counters are no longer checked. The usage
counter can legally go down to zero during filp invalidation while there
are locks pending.
DS events are handled by a separate worker thread instead of the main
thread as reopening files could lead to another crash and a stuck thread.
An additional worker thread is then necessary to unlock it.
Finally, with everything asynchronous a race condition in do_select
surfaced. A select entry was only marked in use after succesfully sending
initial select requests to drivers and having to wait. When multiple
select() calls were handled there was opportunity that these entries
were overwritten. This had as effect that some select results were
ignored (and select() remained blocking instead if returning) or do_select
tried to access filps that were not present (because thrown away by
secondary select()). This bug manifested itself with sendrecs, but was
very hard to reproduce. However, it became awfully easy to trigger with
asynsends only.
2012-08-28 16:06:51 +02:00
|
|
|
break;
|
2010-04-08 15:41:35 +02:00
|
|
|
}
|
2012-02-13 16:28:04 +01:00
|
|
|
if (value != DS_DRIVER_UP) continue;
|
2006-05-11 16:57:23 +02:00
|
|
|
|
2010-04-08 15:41:35 +02:00
|
|
|
/* Perform up. */
|
Split block/character protocols and libdriver
This patch separates the character and block driver communication
protocols. The old character protocol remains the same, but a new
block protocol is introduced. The libdriver library is replaced by
two new libraries: libchardriver and libblockdriver. Their exposed
API, and drivers that use them, have been updated accordingly.
Together, libbdev and libblockdriver now completely abstract away
the message format used by the block protocol. As the memory driver
is both a character and a block device driver, it now implements its
own message loop.
The most important semantic change made to the block protocol is that
it is no longer possible to return both partial results and an error
for a single transfer. This simplifies the interaction between the
caller and the driver, as the I/O vector no longer needs to be copied
back. Also, drivers are now no longer supposed to decide based on the
layout of the I/O vector when a transfer should be cut short. Put
simply, transfers are now supposed to either succeed completely, or
result in an error.
After this patch, the state of the various pieces is as follows:
- block protocol: stable
- libbdev API: stable for synchronous communication
- libblockdriver API: needs slight revision (the drvlib/partition API
in particular; the threading API will also change shortly)
- character protocol: needs cleanup
- libchardriver API: needs cleanup accordingly
- driver restarts: largely unsupported until endpoint changes are
reintroduced
As a side effect, this patch eliminates several bugs, hacks, and gcc
-Wall and -W warnings all over the place. It probably introduces a
few new ones, too.
Update warning: this patch changes the protocol between MFS and disk
drivers, so in order to use old/new images, the MFS from the ramdisk
must be used to mount all file systems.
2011-11-22 13:27:53 +01:00
|
|
|
dmap_endpt_up(owner_endpoint, is_blk);
|
2012-02-13 16:28:04 +01:00
|
|
|
}
|
2006-05-11 16:57:23 +02:00
|
|
|
|
2012-02-13 16:28:04 +01:00
|
|
|
if (r != ENOENT) printf("VFS: ds_event: ds_check failed: %d\n", r);
|
VFS: make all IPC asynchronous
By decoupling synchronous drivers from VFS, we are a big step closer to
supporting driver crashes under all circumstances. That is, VFS can't
become stuck on IPC with a synchronous driver (e.g., INET) and can
recover from crashing block drivers during open/close/ioctl or during
communication with an FS.
In order to maintain serialized communication with a synchronous driver,
the communication is wrapped by a mutex on a per driver basis (not major
numbers as there can be multiple majors with identical endpoints). Majors
that share a driver endpoint point to a single mutex object.
In order to support crashes from block drivers, the file reopen tactic
had to be changed; first reopen files associated with the crashed
driver, then send the new driver endpoint to FSes. This solves a
deadlock between the FS and the block driver;
- VFS would send REQ_NEW_DRIVER to an FS, but he FS only receives it
after retrying the current request to the newly started driver.
- The block driver would refuse the retried request until all files
had been reopened.
- VFS would reopen files only after getting a reply from the initial
REQ_NEW_DRIVER.
When a character special driver crashes, all associated files have to
be marked invalid and closed (or reopened if flagged as such). However,
they can only be closed if a thread holds exclusive access to it. To
obtain exclusive access, the worker thread (which handles the new driver
endpoint event from DS) schedules a new job to garbage collect invalid
files. This way, we can signal the worker thread that was talking to the
crashed driver and will release exclusive access to a file associated
with the crashed driver and prevent the garbage collecting worker thread
from dead locking on that file.
Also, when a character special driver crashes, RS will unmap the driver
and remap it upon restart. During unmapping, associated files are marked
invalid instead of waiting for an endpoint up event from DS, as that
event might come later than new read/write/select requests and thus
cause confusion in the freshly started driver.
When locking a filp, the usage counters are no longer checked. The usage
counter can legally go down to zero during filp invalidation while there
are locks pending.
DS events are handled by a separate worker thread instead of the main
thread as reopening files could lead to another crash and a stuck thread.
An additional worker thread is then necessary to unlock it.
Finally, with everything asynchronous a race condition in do_select
surfaced. A select entry was only marked in use after succesfully sending
initial select requests to drivers and having to wait. When multiple
select() calls were handled there was opportunity that these entries
were overwritten. This had as effect that some select results were
ignored (and select() remained blocking instead if returning) or do_select
tried to access filps that were not present (because thrown away by
secondary select()). This bug manifested itself with sendrecs, but was
very hard to reproduce. However, it became awfully easy to trigger with
asynsends only.
2012-08-28 16:06:51 +02:00
|
|
|
|
|
|
|
thread_cleanup(NULL);
|
|
|
|
return(NULL);
|
2012-02-13 16:28:04 +01:00
|
|
|
}
|