Commit graph

1401 commits

Author SHA1 Message Date
Ben Gras
2d72cbec41 SYSENTER/SYSCALL support
. add cpufeature detection of both
	. use it for both ipc and kernelcall traps, using a register
	  for call number
	. SYSENTER/SYSCALL does not save any context, therefore userland
	  has to save it
	. to accomodate multiple kernel entry/exit types, the entry
	  type is recorded in the process struct. hitherto all types
	  were interrupt (soft int, exception, hard int); now SYSENTER/SYSCALL
	  is new, with the difference that context is not fully restored
	  from proc struct when running the process again. this can't be
	  done as some information is missing.
	. complication: cases in which the kernel has to fully change
	  process context (i.e. sigreturn). in that case the exit type
	  is changed from SYSENTER/SYSEXIT to soft-int (i.e. iret) and
	  context is fully restored from the proc struct. this does mean
	  the PC and SP must change, as the sysenter/sysexit userland code
	  will otherwise try to restore its own context. this is true in the
	  sigreturn case.
	. override all usage by setting libc_ipc=1
2012-09-24 15:53:43 +02:00
Ben Gras
8a3b6ca3bb remove unused <tools.h> 2012-09-20 12:24:22 +02:00
Ben Gras
b16aacc7f3 vm: fix failed alloc condition 2012-09-19 22:24:56 +02:00
Ben Gras
bc4c07f4f1 coverity appeasement - redundant check 2012-09-19 17:19:57 +02:00
Ben Gras
60014efb3e vfs: pm_dumpcore: always clean up process
. whenever this function is called, pm will expect
	  the process to be cleaned up
	. so don't abort the process entirely on error
	. fixes a later 'forking on top of in-use child' vfs panic
2012-09-19 17:13:17 +02:00
Ben Gras
25817b0854 vm: change NO_MEM to a more impossible value
fixes an assert() firing when starting X. thanks to the report by pikpik.

	. NO_MEM was 0, which is actually an existing piece
	  of physical memory. it can't be allocated because it's reserved
	  for bios data (by the kernel), but it can be mapped in (e.g.
	  by X), causing sanity check disaster.
	. NONCONTIGUOUS is also obsolete as all allocations are single-page
	  now, i.e. NONCONTIGUOUS is really the default and only mode.
2012-09-19 15:31:36 +02:00
Ben Gras
fe6e291f59 vm, kernel, top: report memory usage of vm, kernel 2012-09-18 23:43:52 +02:00
Ben Gras
aa82e375c6 VM: remove dead code 2012-09-18 18:40:57 +02:00
Ben Gras
d526f1a0db some coverity fixes. 2012-09-18 15:11:51 +02:00
Ben Gras
ddf1981004 VM: restore >4k secondary cache functionality
. by storing length in the yielded blocks node again
2012-09-18 13:17:52 +02:00
Ben Gras
ed1af3c86c VM: full munmap
complete munmap implementation; single-page references made
a general munmap() implementation possible to write cleanly.

	. memory: let the MIOCRAMSIZE ioctl set the imgrd device
	  size (but only to 0)
	. let the ramdisk command set sizes to 0
	. use this command to set /dev/imgrd to 0 after mounting /usr
	  in /etc/rc, so the boot time ramdisk is freed (about 4MB
	  currently)
2012-09-18 13:17:52 +02:00
Ben Gras
16c3870b2e VM: abstract datastructures a bit
. a little less duplication in region.c
2012-09-18 13:17:51 +02:00
Ben Gras
0d1f2e6be2 VM: simplify slab allocator
. only keep a list of non-empty, non-full pages with slab objects
	. simplifies alloc/free operations and reduces list management overhead
2012-09-18 13:17:50 +02:00
Ben Gras
19e6dad47b VM: only single page chunks
. only reference single pages in process data structures
   to simplify page faults, copy-on-write, etc.
 . this breaks the secondary cache for objects that are
   not one-page-sized; restored in a next commit
2012-09-18 13:17:49 +02:00
Ben Gras
6d7b770761 VM: static data structure for mem allocation
. allocate physical memory using a fixed, pre-allocated bitmap so there
   are no call cycles and it's avilable earlier
2012-09-18 13:17:48 +02:00
Ben Gras
2cb560297c VM: remove unused dma memory support functions from vm
. unused calls / data structures
2012-09-18 13:17:47 +02:00
Ben Gras
8821c73a9e VM: forget about 'holes'
. unused data structures and code
2012-09-18 13:17:46 +02:00
Ben Gras
6410f4b5db VM: some sanitycheck fixes
minor fixes to restore SANITYCHECKS
2012-09-18 13:17:45 +02:00
Thomas Veerman
c087a60ed2 VFS: fix GCC compilation error 2012-09-17 15:29:38 +00:00
Thomas Veerman
edefb7b35f PM: don't deliver signals to VM 2012-09-17 11:01:46 +00:00
Thomas Veerman
3881e732a9 VFS: panic when unmount_all fails 2012-09-17 11:01:46 +00:00
Thomas Veerman
992799b91f 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.
2012-09-17 11:01:45 +00:00
Sbastien Boisvert
373cb6526c IPC server: do not loop to find syscall handler
Instead of using a loop to find a matching ipc (inter process
communication) system call type, the offset in the call table can be
simply calculated in constant time.

Also, when the interprocess communication server receives an ipc
system call from a process, ipc should tell VM to watch the process
only once. This patch fixes that also.

(Patch and commit message slightly edited by committer.)
2012-09-10 19:20:03 +02:00
Ben Gras
3c57102616 devman: initialize libvtreefs hooks
. uninitialized cleanup hook was causing devman crashes
	  on reboot, calling uninitialized cleanup hook whenever it
	  didn't happen to be 0
2012-08-31 19:12:49 +02:00
Ben Gras
053fa581b5 vm: remove stack handling for signals
. moved to the kernel as the handling was only
	  reading it; the kernel may as well write it too
2012-08-29 17:31:38 +02:00
Ben Gras
e4ac80eb60 various warning/errorwarning fixes for gcc47
. warnings (sometimes promoted to errors) in servers/ and kernel/
 . -Os for ext2 boot module to make it small enough
2012-08-27 16:19:18 +02:00
Arun Thomas
7ca1ce7968 VM: Add PTF_READ page table flag 2012-08-17 00:17:52 +02:00
Arun Thomas
fc9b3f9bdd VM: allow for 16KB chunk alignment 2012-08-17 00:17:52 +02:00
Arun Thomas
c78b56a9e5 RS: Make PCI code optional 2012-08-17 00:17:51 +02:00
David van Moolenbroek
5456f2728e ext2: resolve Coverity warnings 2012-08-14 09:11:19 +00:00
Arun Thomas
697f0d097f Rename sys_vmctl_get_cr3_i386 2012-08-12 23:30:54 +02:00
Arun Thomas
263ec1e885 pm: update for ARM 2012-08-12 23:30:54 +02:00
Ben Gras
31d8526346 libexec: add load_offset feature, used for ld.so
. ld.so is linked at 0 but it can relocate itself; we
	  wish to load ld.so higher though to trap NULL dereferences.
	  if we know we have to execute ld.so, vfs tells libexec to put it
	  higher.
2012-08-12 23:22:54 +02:00
David van Moolenbroek
be87fdda3d PM: resolve Coverity warnings 2012-08-09 00:16:35 +02:00
David van Moolenbroek
aa5531fc67 IS: resolve Coverity warnings 2012-08-09 00:16:35 +02:00
David van Moolenbroek
fd8c6c1d30 IPC: resolve Coverity warnings 2012-08-09 00:16:35 +02:00
David van Moolenbroek
8c5d506b8a procfs: resolve Coverity warnings 2012-08-09 00:16:34 +02:00
Ben Gras
b3f47f5835 vm: ignore RS pin (pre-allocate) requests for now
. done by RS to reduce/remove dependency on VM for recovery
	. RS has the default stack size of 64MB since the nosegments
	  change, using a huge amount of unused memory to pre-allocate
	. ignore these requests until actually required (i.e. being able
	  to survive VM crashes)

Thanks to pikpik for investigating why RS was so huge.
2012-08-08 15:51:10 +02:00
Arun Thomas
6723dcfab7 Replace MACHINE/CHIP macros with compiler macros 2012-08-06 17:49:22 +02:00
David van Moolenbroek
2d20088881 MFS: fix block estimation computation 2012-08-03 13:25:56 +00:00
Tomas Hruby
9c7bae4e16 LWIP - fix, removed segments
- compiles again
2012-08-03 00:20:34 -07:00
David van Moolenbroek
d18f3a9bc9 ext2: remove -Werror from CFLAGS
This breaks the Coverity build at the moment.
2012-08-01 12:39:14 +00:00
Thomas Veerman
66dbf73049 VFS: fix locking bug in clone_opcl
When VFS runs out of vnodes after closing a vnode in opcl, common_open
will try to unlock a vnode through unlock_filp that has already been
unlocked in clone_opcl. By first obtaining and locking a new vnode this
situation is prevented; if there are no free vnodes, common_open will
unlock a still locked vnode.
2012-07-30 10:01:16 +00:00
Thomas Veerman
f6b0d662b5 VFS: check path components for NAME_MAX length 2012-07-30 09:44:58 +00:00
Thomas Veerman
48237f1730 ext2: use new secondary cache method
This gets rid of the ! emitted by VM when using ext2
2012-07-30 09:44:58 +00:00
Thomas Veerman
6c597561bc EXT2: various fixes
.enable all compile time warnings and make them errors
.refactor functions with unused parameters
.fix null pointer dereference before checking for null
.proper variable initialization
.use safe string copy functions
.fix massive memory corruption bug in fs_getdents
2012-07-30 09:44:58 +00:00
Thomas Veerman
238a9a057b PM: a few Coverity inspired fixes
.initialize variable to prevent negative array indexing
.remove dead code
2012-07-30 09:44:58 +00:00
Thomas Veerman
ca085c16ef procfs: use safe string copy 2012-07-30 09:44:58 +00:00
Thomas Veerman
c21503bdf8 isofs: fixes for coverity defects
.use safe string copy functions
.CD-ROM are always mounted read-only
2012-07-30 09:44:58 +00:00
Thomas Veerman
1c480f749a MFS: fixes for defects reported by Coverity
.use safe string copy
.fix (potential) int overflow in function return
2012-07-30 09:44:58 +00:00
Thomas Veerman
fa9199e049 MFS: getdents fixes
.Use a bigger buffer to hold results
.Do not try to store more data than user buffer can hold
2012-07-30 09:44:57 +00:00
Ben Gras
b6ea15115c kernel: facility for user-visible memory
. map all objects named usermapped_*.o with globally visible
	  pages; usermapped_glo_*.o with the VM 'global' bit on, i.e.
	  permanently in tlb (very scarce resource!)
	. added kinfo, machine, kmessages and loadinfo for a start
	. modified log, tty to make use of the shared messages struct
2012-07-28 20:57:38 +00:00
David van Moolenbroek
0b4c154160 VFS: call req_inhibread again 2012-07-19 14:36:51 +00:00
David van Moolenbroek
e0742978f1 VFS: do not resolve symlinks in rename(2) 2012-07-18 14:59:45 +00:00
Thomas Veerman
963a10e15a PFS: fix negative array index 2012-07-18 10:05:50 +00:00
Thomas Veerman
0d3ccd8908 VFS: fix coverity defects 2012-07-17 10:29:22 +00:00
Thomas Veerman
fd60f03129 VFS: remove support for sync FS communication 2012-07-17 10:12:53 +00:00
Thomas Veerman
06f49fe167 VFS: prevent buffer overflow
If an FS returns faulty struct dirent data, VFS could overflow
a buffer that holds this data.
2012-07-17 08:49:41 +00:00
Ben Gras
cbcdb838f1 various coverity-inspired fixes
. some strncpy/strcpy to strlcpy conversions
	. new <minix/param.h> to avoid including other minix headers
	  that have colliding definitions with library and commands code,
	  causing parse warnings
	. removed some dead code / assignments
2012-07-16 14:00:56 +02:00
Thomas Veerman
77dbd766c1 VFS: Use safe string copy functions 2012-07-16 10:57:43 +00:00
Ben Gras
50e2064049 No more intel/minix segments.
This commit removes all traces of Minix segments (the text/data/stack
memory map abstraction in the kernel) and significance of Intel segments
(hardware segments like CS, DS that add offsets to all addressing before
page table translation). This ultimately simplifies the memory layout
and addressing and makes the same layout possible on non-Intel
architectures.

There are only two types of addresses in the world now: virtual
and physical; even the kernel and processes have the same virtual
address space. Kernel and user processes can be distinguished at a
glance as processes won't use 0xF0000000 and above.

No static pre-allocated memory sizes exist any more.

Changes to booting:
        . The pre_init.c leaves the kernel and modules exactly as
          they were left by the bootloader in physical memory
        . The kernel starts running using physical addressing,
          loaded at a fixed location given in its linker script by the
          bootloader.  All code and data in this phase are linked to
          this fixed low location.
        . It makes a bootstrap pagetable to map itself to a
          fixed high location (also in linker script) and jumps to
          the high address. All code and data then use this high addressing.
        . All code/data symbols linked at the low addresses is prefixed by
          an objcopy step with __k_unpaged_*, so that that code cannot
          reference highly-linked symbols (which aren't valid yet) or vice
          versa (symbols that aren't valid any more).
        . The two addressing modes are separated in the linker script by
          collecting the unpaged_*.o objects and linking them with low
          addresses, and linking the rest high. Some objects are linked
          twice, once low and once high.
        . The bootstrap phase passes a lot of information (e.g. free memory
          list, physical location of the modules, etc.) using the kinfo
          struct.
        . After this bootstrap the low-linked part is freed.
        . The kernel maps in VM into the bootstrap page table so that VM can
          begin executing. Its first job is to make page tables for all other
          boot processes. So VM runs before RS, and RS gets a fully dynamic,
          VM-managed address space. VM gets its privilege info from RS as usual
          but that happens after RS starts running.
        . Both the kernel loading VM and VM organizing boot processes happen
	  using the libexec logic. This removes the last reason for VM to
	  still know much about exec() and vm/exec.c is gone.

Further Implementation:
        . All segments are based at 0 and have a 4 GB limit.
        . The kernel is mapped in at the top of the virtual address
          space so as not to constrain the user processes.
        . Processes do not use segments from the LDT at all; there are
          no segments in the LDT any more, so no LLDT is needed.
        . The Minix segments T/D/S are gone and so none of the
          user-space or in-kernel copy functions use them. The copy
          functions use a process endpoint of NONE to realize it's
          a physical address, virtual otherwise.
        . The umap call only makes sense to translate a virtual address
          to a physical address now.
        . Segments-related calls like newmap and alloc_segments are gone.
        . All segments-related translation in VM is gone (vir2map etc).
        . Initialization in VM is simpler as no moving around is necessary.
        . VM and all other boot processes can be linked wherever they wish
          and will be mapped in at the right location by the kernel and VM
          respectively.

Other changes:
        . The multiboot code is less special: it does not use mb_print
          for its diagnostics any more but uses printf() as normal, saving
          the output into the diagnostics buffer, only printing to the
          screen using the direct print functions if a panic() occurs.
        . The multiboot code uses the flexible 'free memory map list'
          style to receive the list of free memory if available.
        . The kernel determines the memory layout of the processes to
          a degree: it tells VM where the kernel starts and ends and
          where the kernel wants the top of the process to be. VM then
          uses this entire range, i.e. the stack is right at the top,
          and mmap()ped bits of memory are placed below that downwards,
          and the break grows upwards.

Other Consequences:
        . Every process gets its own page table as address spaces
          can't be separated any more by segments.
        . As all segments are 0-based, there is no distinction between
          virtual and linear addresses, nor between userspace and
          kernel addresses.
        . Less work is done when context switching, leading to a net
          performance increase. (8% faster on my machine for 'make servers'.)
	. The layout and configuration of the GDT makes sysenter and syscall
	  possible.
2012-07-15 22:30:15 +02:00
Ben Gras
cfe1ed4df4 profiling related cleanup
. do not declare any data in <minix/profile.h>
	. addr check no longer necessary
2012-07-15 21:56:55 +02:00
Thomas Veerman
f09c2e014f Use MACHINE_ARCH instead of ARCH 2012-06-18 10:53:35 +00:00
Thomas Veerman
f93afa00e9 Remove MINIXSRCDIR and use NETBSDSRCDIR
NETBSDSRCDIR is used all over the place anyway, and this reduces
our diff with NetBSD a little.
2012-06-18 10:53:35 +00:00
Ben Gras
0fb2f83da9 drop from segments physcopy/vircopy invocations
. sys_vircopy always uses D for both src and dst
	. sys_physcopy uses PHYS_SEG if and only if corresponding
	  endpoint is NONE, so we can derive the mode (PHYS_SEG or D)
	  from the endpoint arg in the kernel, dropping the seg args
	. fields in msg still filled in for backwards compatability,
	  using same NONE-logic in the library
2012-06-18 12:28:40 +00:00
Ben Gras
0e35eb0c6b drop segments from safemap/safeunmap invocations 2012-06-18 12:28:40 +00:00
Kees Jongenburger
51a9903002 Add support in devmand for using config dirs.
Add support in devmand for using configuration directories to
allow 3rd party packages to add configuration items.
2012-06-18 09:29:53 +02:00
Ben Gras
2bfeeed885 drop segment from safecopy invocations
. all invocations were S or D, so can safely be dropped
	  to prepare for the segmentless world
	. still assign D to the SCP_SEG field in the message
	  to make previous kernels usable
2012-06-16 16:22:51 +00:00
Ben Gras
85ff5a947e dumpcore: use ptrace function to trigger a coredump
. dumpcore currently relies on minix segments
	. also ptrace dumpcore fix
2012-06-15 12:13:50 +02:00
Ben Gras
5e38c802d8 pm: ignore notify() from unknown sender
. avoids annoying error message if e.g. buggy drivers
	  send pm notify()s that pm tries to reply() ENOSYS to
2012-06-14 15:36:38 +02:00
Ben Gras
769af57274 further libexec generalization
. new mode for sys_memset: include process so memset can be
	  done in physical or virtual address space.
	. add a mode to mmap() that lets a process allocate uninitialized
	  memory.
	. this allows an exec()er (RS, VFS, etc.) to request uninitialized
	  memory from VM and selectively clear the ranges that don't come
	  from a file, leaving no uninitialized memory left for the process
	  to see.
	. use callbacks for clearing the process, clearing memory in the
	  process, and copying into the process; so that the libexec code
	  can be used from rs, vfs, and in the future, kernel (to load vm)
	  and vm (to load boot-time processes)
2012-06-07 15:15:02 +02:00
Ben Gras
040362e379 exec() cleanup, generalization, improvement
. make exec() callers (i.e. vfs and rs) determine the
	  memory layout by explicitly reserving regions using
	  mmap() calls on behalf of the exec()ing process,
	  i.e. handling all of the exec logic, thereby eliminating
	  all special exec() knowledge from VM.
	. the new procedure is: clear the exec()ing process
	  first, then call third-party mmap()s to reserve memory, then
	  copy the executable file section contents in, all using callbacks
	  tailored to the caller's way of starting an executable
	. i.e. no more explicit EXEC_NEWMEM-style calls in PM or VM
	  as with rigid 2-section arguments
	. this naturally allows generalizing exec() by simply loading
	  all ELF sections
	. drop/merge of lots of duplicate exec() code into libexec
	. not copying the code sections to vfs and into the executable
	  again is a measurable performance improvement (about 3.3% faster
	  for 'make' in src/servers/)
2012-06-07 15:15:01 +02:00
Ben Gras
41b869d4d6 drop aout support
justification: soon we won't be able to execute sep I&D aouts at
all (because of the vanishing segments), which was the default mode
to generate them so most binaries will be sep I&D.

this makes the vfs/rs exec() unification work simpler.

after unification, common I&D aout could be added back quite simply.
2012-06-07 12:43:16 +02:00
Ben Gras
ee4016155e vm: add third-party mmap() mode and PROCCTL
these two functions will be used to support all exec() functionality
going into a single library shared by RS and VFS and exec() knowledge
leaving VM.

	. third-party mmap: allow certain processes (VFS, RS) to
	  do mmap() on behalf of another process
	. PROCCTL: used to free and clear a process' address space
2012-06-07 12:43:16 +02:00
David van Moolenbroek
1817f7fc07 VFS: fix "process already free" panic on reboot
Reported by Claudiu Dan Gheorghe, debugged by Thomas and myself
2012-05-02 17:42:50 +02:00
Thomas Veerman
068d443d12 VFS: unlock vmnt when out of vnodes 2012-04-27 08:51:13 +00:00
Thomas Veerman
b6ff38065f VFS: release what can be released
Only attempt to release blocked processes that are blocked. There is
no use in trying to find more blocked processes than we know that are
blocked (on a pipe).
2012-04-27 08:51:02 +00:00
Thomas Veerman
7b81254069 VFS: simplify stat for pipes
According to POSIX the st_size field of struct stat is undefined for
fifos and anonymous pipes. Thus we can do anything we want. We save a
copy by not being accurate on pipe sizes.
2012-04-27 08:50:49 +00:00
Thomas Veerman
db8198d99d VFS: use S_IS* macros 2012-04-27 08:49:38 +00:00
Thomas Veerman
96bbc5da3e VFS: I_PIPE is redundant
Also, use S_IS* macros instead of manual comparison.
2012-04-27 08:49:38 +00:00
Ben Gras
755102d67f AT_SUN_EXECNAME support
. vfs: pass execname in aux vectors
	. ld.elf_so: use this to expand $ORIGIN
	. this requires the executable to reserve more
	  space at exec() calling time
2012-04-26 13:32:39 +02:00
David van Moolenbroek
0c11190cdc MFS: reimplement block clean marking fix
MFS' get_block() must never return a newly acquired block buffer that
is marked dirty from previous use. This patch replaces git-dd59d50,
which assumed a working model where blocks for device NO_DEV would
never be dirty. For at least one scenario, that assumption does not
hold, triggering superblock overwrite warnings. In this patch, blocks
are explicitly marked as clean upon being repurposed. The working
model is now restored to be: the dirty state of a block is relevant
only when its associated device is not set to NO_DEV.
2012-04-20 17:40:47 +02:00
David van Moolenbroek
26f817243b VFS: reimplement truncate mtime/ctime fix
POSIX mandates that a file's modification and change time be left
untouched upon truncate/ftruncate iff the file size does not change.
However, an open(O_TRUNC) call must always update the modification and
change time of the file, even if it was already zero-sized. VFS uses
the file systems' truncate call to implement O_TRUNC. This patch
replaces git-255ae85, which did not take into account the open case.
The size check is now moved into VFS, so that individual file systems
need not check for this case anymore.
2012-04-20 11:35:59 +02:00
David van Moolenbroek
093c949274 procfs: fix rare panic in add_inode
Previously, procfs would consider all processes that have a non-free
kernel slot *or* an in-use PM slot. However, since AVFS, a non-free
kernel slot does not imply an in-use PM slot. As a result, procfs
may use PM slots that have a zero PID value. If two such entries are
present in the retrieved PM table, procfs would try to add two inodes
with the same name "0", triggering an assertion in vtreefs.

This patch makes procfs consider only the PM slot for (non-task)
processes.
2012-04-19 11:26:11 +02:00
Ben Gras
3945cfbfd3 block ioctls: pass request number 2012-04-18 11:01:15 +02:00
Ben Gras
53002f6f6c recognize and execute dynamically linked executables
. generalize libexec slightly to get some more necessary information
	  from ELF files, e.g. the interpreter
	. execute dynamically linked executables when exec()ed by VFS
	. switch to netbsd variant of elf32.h exclusively, solves some
	  conflicting headers
2012-04-16 00:41:42 +00:00
Thomas Veerman
26ec619a30 VFS: fix filp reuse race
Pipes consist of two filps (read filp and write filp) and a shared
vnode. When the writer leaves the filp reference count drops to
zero and subsequent find_filp()s should not find the filp when a
reader looks for it and the reader gets EOF. However, the pipe()
system call tries to find two filps, marks them in use, and only
after a successful node creation on PFS, overwrites the shared
vnode with the new vnode. Consequently, this leaves a small window
where a just closed 'pipe write filp' gets reused and marked as
present, before becoming the actual new 'pipe write filp' for a new
pipe. A reader for the old pipe will think a writer is present and
wait for that writer to write something or to leave; both actions
should revive the suspended reader. This will never happen and the
reader will be stuck forever.
2012-04-13 13:22:57 +00:00
Thomas Veerman
e292ba487e VFS: more three-level-lock sanity checking 2012-04-13 13:22:42 +00:00
Thomas Veerman
933120b0b1 VFS: add getting active threads control msg 2012-04-13 13:21:01 +00:00
Thomas Veerman
e1a73469c8 VFS: remove debug print 2012-04-13 13:20:28 +00:00
Thomas Veerman
c2bb739760 VFS: let know when skipping reply 2012-04-13 13:19:45 +00:00
Thomas Veerman
91a38b6d4e VFS: fix dead lock
When running out of worker threads to handle device replies a dead
lock resolver thread is used. However, it was only used for FS
endpoints; it is now used for "system processes" (drivers and FS
endpoints). Also, drivers were marked as system process when they
were not "forced" to map (i.e., mapping was done before endpoint was
alive).
2012-04-13 13:19:10 +00:00
Thomas Veerman
b956493367 VFS: fix new signed/unsigned comparisons 2012-04-13 13:00:11 +00:00
Thomas Veerman
defe329519 VFS: warnings are errors 2012-04-13 12:59:32 +00:00
Thomas Veerman
0d63d9e125 VFS: enable sending control messages 2012-04-13 12:54:55 +00:00
Thomas Veerman
f571466c56 VFS: find job only if request is an transaction 2012-04-13 12:52:52 +00:00
Thomas Veerman
8f55767619 VFS: make m_in job local
By making m_in job local (i.e., each job has its own copy of m_in instead
of refering to the global m_in) we don't have to store and restore m_in
on every thread yield. This reduces overhead. Moreover, remove the
assumption that m_in is preserved. Do_XXX functions have to copy the
system call parameters as soon as possible and only pass those copies to
other functions.

Furthermore, this patch cleans up some code and uses better types in a lot
of places.
2012-04-13 12:50:38 +00:00
Ben Gras
99866db8cd vm: add MAP_FIXED 2012-04-12 15:01:36 +02:00
Ben Gras
1e2b3f4326 vfs: more regions for coredumps 2012-04-12 14:29:59 +02:00
Ben Gras
b480472a76 vm: full memory view
for user-space processes, increase text segment so it reaches the full
address space, so code can be executed anywhere.
2012-04-12 02:58:39 +02:00
Ben Gras
660e15b2d1 vm: break: allow brk() on any region
use the user-supplied point to lookup which region to perform brk() on,
and if it's a reasonable one, do it, no matter what vm's notion of the
heap region is.
2012-04-12 02:57:59 +02:00
David van Moolenbroek
928d76dbe8 Add VBFS: VirtualBox Shared Folder File System
Refer to "man vbfs" on how to mount it.
2012-04-11 00:27:48 +02:00
David van Moolenbroek
ef7b484e5c Create SFFS library out of HGFS
This Shared Folders File System library (libsffs) now contains all the
file system logic originally in HGFS. The actual HGFS server code is
now a stub that passes on all the work to libsffs. The libhgfs library
is changed accordingly.
2012-04-09 18:08:26 +02:00
David van Moolenbroek
09b327b042 HGFS: move all VMware-specific code into libhgfs 2012-04-09 17:32:36 +02:00
David van Moolenbroek
fa805ebd1e Kernel/servers/drivers: resolve a few warnings
Flagged by clang 3.1.
2012-03-30 16:55:06 +02:00
David van Moolenbroek
638ce89250 hgfs: subsecond timestamp precision
Slightly cleaned up version of patch contributed by Antoine Leca.
2012-03-30 01:40:07 +02:00
Ben Gras
204ae72525 retire _ANSI and <minix/ansi.h> 2012-03-25 21:58:27 +02:00
Ben Gras
db242ed39d retire _CONST, _VOLATILE, _SIZET, _ARGS, _VOID 2012-03-25 21:58:20 +02:00
Ben Gras
7336a67dfe retire PUBLIC, PRIVATE and FORWARD 2012-03-25 21:58:14 +02:00
Ben Gras
6a73e85ad1 retire _PROTOTYPE
. only good for obsolete K&R support
	. also remove a stray ansi.h and the proto cmd
2012-03-25 16:17:10 +02:00
David van Moolenbroek
b91295a8d2 vm: if mmap address is given, try that first
Previously, the mmap address (if given) was merely used as a lower
bound, and then possibly overriden with a hint. Now, the mapping is
first tried at the exact given address. If that fails, the start of
the mmap range is used as lower bound (which is then still overridden
by the hint for efficiency).

This allows two pages to be mapped in at predefined addresses, where
the second address is lower than the first. That was not possible.
2012-03-24 19:51:14 +01:00
Ben Gras
6af9856d4a libcompat_minix-centric cleanup
remove some old minix-userland-specific stuff

	. /etc/ttytab as a file, and minix-compat function (fftyslot()),
	  replaced by /etc/ttys and new libc functions
	. also remove minix-specific nlist(), cuserid(), fttyslot(), v8 regex
	  functions and <compat/regex.h>
	. and remaining minix-only utilities that use them
	. also unused <compat/pwd.h> and <compat/syslog.h> and
	  redundant <sys/sigcontext.h>
2012-03-16 17:06:24 +01:00
David van Moolenbroek
e8d2d2f6b6 libminc-related updates
- add files needed for acpi, ahci, fbd, vfs to libminc
- remove "-lc" from their respective makefiles
- remove setenv from libminc (requires initialization)
2012-03-12 23:16:45 +01:00
David van Moolenbroek
fecfd07997 mfs: more accurate stat.st_blocks estimation
On MFS file systems, the stat(2) call now counts indirect blocks as
part of the st_blocks calculation, in addition to proper initial
rounding of the file size. The returned value is now a true upper
bound on the actual number of 512-byte blocks allocated to the file.
As before, it is not accurate for sparse files.
2012-03-05 22:32:33 +01:00
David van Moolenbroek
075f839810 mfs: remove legacy stat code 2012-03-05 22:32:32 +01:00
Tomas Hruby
fb31513b00 LWIP,NETSOCK - lwip uses asynchronous protocol
- libnetsock - internal implementation of a socket on the lwip
  server side. it encapsulates the asynchronous protocol

- lwip server - uses libnetsock to work with the asynchronous
  protocol
2012-03-02 15:44:48 +00:00
Tomas Hruby
199e9c1907 LWIP fixed Makefile 2012-03-02 15:44:48 +00:00
Tomas Hruby
72b7abd1a1 VFS - no CANCEL for async non-blocking operations
- if an operation (R, W, IOCTL) is non blocking, a flag is set
  and sent to the device.

- nothing changes for sync devices

- asyn devices should reply asap if an operation is non-blocking.
  We must trust the devices, but we had to trust them anyway to
  reply to CANCEL correctly

- we safe sending CANCEL commands to asyn devices. This greatly
  simplifies the protocol. Asynchronous devices can always reply
  when a reply is ready and do not need to deal with other
  situations

- currently, none of our drivers use the flags since they drive
  virtual devices which do not block
2012-03-02 15:44:48 +00:00
Tomas Hruby
f19d8df184 VFS : simplification of handling asyn selects
- select_request_async() returns no ops by default

- wantops in do_select() always set correctly, do_select() does
  not need a special case for SUSPEND (and ugly code)
2012-03-02 15:44:48 +00:00
Tomas Hruby
369a12704f VFS - dev_style_asyn()
- dev_style_asyn() tests whether a device is asynchronous

 - simplifies code and helps readability
2012-03-02 15:44:47 +00:00
Tomas Hruby
35eb88461d VFS - cancel_nblock()
- duplicate code in dev_io() which sends CANCEL in case of a
  non-blocking operation moved to cancel_nblock()
2012-03-02 15:44:47 +00:00
Thomas Veerman
eb4096ccd1 iso9660: link with libc
Prevents assert("inited") in _env.c (libc) from triggering.
2012-02-22 15:17:20 +00:00
Thomas Veerman
1efb51b1de VFS: improve crashed FS resource cleanup
When VFS detects that an FS has crashed and tries to clean up
resources, it marks fairly late in the process that a vmnt is not
to be used again (to send requests to). This allows a thread to
become blocked on a vmnt after all blocked threads were stopped, but
before it finds out it shouldn't try to send to that vmnt.
2012-02-22 13:54:35 +00:00
Thomas Veerman
5ff845212e VFS: remove unused variables 2012-02-21 10:21:05 +00:00
Thomas Veerman
0c1cd8720a VFS: fix last_dir not returning last directory
If the provided path was only a single component (i.e., without
slashes), then last_dir would return early and skip the symlink
detection (i.e., check whether the path ends in a symlink and resolve
that first before returning). This bug triggered an assert in open
which expects that an advance after an last_dir (with VMNT_WRITE lock)
does not yield another vmnt lock.
2012-02-21 10:21:05 +00:00
Thomas Veerman
230ea1ce13 VFS: remove erroneous assert
The assert was meant as an additional check to the assert in link.c:198.
The reasoning behind the assert in link.c:198 is that once you've
obtained a write lock on a vmnt, you can't get an additional read lock
on the same vmnt. However, that does not always hold for the assert in
path.c:281 where the situation could be that you've obtained a read lock
and managed to get another read lock (this is possible). In other words,
the assert in path.c:281 is not the right place to check for that
situation.
2012-02-20 09:17:42 +00:00
Thomas Veerman
c540bcb001 VFS: various select fixes
- Fix locking bug when unable to send DEV_SELECT request. Upon failure
  VFS tried to cancel the select operation, but this failed due to trying
  to lock a filp that was already locked to send the request in the first
  place. Do_select_request now handles locking of filps itself instead of
  relying on the caller to do it.  This fixes a crash when killing INET.
- Fix failure to revive a process after a non-blocking select operation
  yielded no ready select operations when replying DEV_SEL_REPL1.
- Improve readability by using OK, SUSPEND, and standard error values as
  results instead of having separate macros in select.
- Don't print not having a driver for a major device; after killing a driver
  select will trigger this printf.
2012-02-17 21:09:07 +00:00
Arun Thomas
5d958f894f servers: fix clang warnings in iso9660fs and vm 2012-02-17 16:48:40 +01:00
Arun Thomas
ff56906879 Remove obsolete INSTALLFLAGS from makefiles 2012-02-16 23:26:38 +01:00
Antoine Leca
3fb8cb760c More cleaning up 2012-02-15 19:04:58 +00:00
Ben Gras
47c1f10835 re-enable update-superblock check
This reverts commit cdbc4bfb13.
2012-02-15 03:46:01 +01:00
Ben Gras
2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00
Thomas Veerman
80c4685324 VFS: replace VFS with AVFS 2012-02-13 16:53:21 +00:00
Thomas Veerman
0c99f4f4b7 AVFS: reinitialize lookup object before reuse 2012-02-10 09:50:21 +00:00
Thomas Veerman
972a791882 AVFS/APFS: small cleanup 2012-02-09 16:33:24 +00:00
Thomas Veerman
abd6043a2f AVFS: fix various system call interruption issues
- When cancelling ioctls, VFS did not remember which file descriptor
   to cancel and sent bogus to the driver.
 - Select state was not cleaned up when select()ing process was
   interrupted.
 - Process trying to do a system call at the exact same time as a user
   trying to interrupt the process, could cause the system call worker
   thread to overwrite state belonging to the worker thread trying to
   exit the process. This led to hanging threads and eventual system hang
   when this happens often enough.
2012-02-09 14:24:28 +00:00
Thomas Veerman
4498750810 libchardriver: fix open reply for async devices 2012-02-09 14:17:54 +00:00
Ben Gras
cc1ae59c9b -lminixutil link fixes
. not available and not needed for clang
2012-02-06 16:08:29 +01:00
Ben Gras
1eea0f5680 inet: strncmp() fix 2012-02-03 14:49:18 +01:00
Ben Gras
cdbc4bfb13 temporarily disable update-superblock check
. incompatible with installboot -d FSDEV on mounted filesystems
	. should be re-enabled when netbsd boot loader is default
2012-02-02 15:04:51 +01:00
Thomas Veerman
b33f504e8f APFS: fix link issue when compiling with Clang 2012-02-02 15:00:01 +00:00
Thomas Veerman
a65ff8a1aa INET: fix 'improved' assert 2012-02-02 11:53:52 +00:00
Thomas Veerman
224a0f6e90 INET: fix a few GCC compilation warnings 2012-02-01 13:24:28 +00:00
Thomas Veerman
4d3a0887b4 AVFS: only put mount point when it was used as one
When a mount operation fails and the FS exits, free_proc could try and
clean up resources associated with the mount point before the mount
thread itself can do that. However, the clean up procedure should only
clean up resources that were actually in use.
2012-02-01 13:22:53 +00:00
Thomas Veerman
a87ec6840f INET: remove erroneous assert
The queue may contain established connections which have
tc_connInprogress clear.
2012-01-30 16:09:08 +00:00
Thomas Veerman
1ff24e3f2f Don't panic on a misconfigured machine 2012-01-30 15:16:20 +00:00
Thomas Veerman
1fc399a5c1 Add permission test for bind and socket
Also, apply forbidden patch to VFS from AVFS (fixes hanging test56 if
it has the permission test).
2012-01-30 15:16:20 +00:00
Thomas Veerman
9330d92639 INET: drop privileges upon startup 2012-01-30 15:16:20 +00:00
Thomas Veerman
becf700bc2 APFS: drop privileges upon startup
Move SERVICE_LOGIN to rs.h global header so it's accessible for all.
2012-01-30 15:16:20 +00:00
Thomas Veerman
9233fdb359 AVFS: make forbidden check for specific proc instead of fp 2012-01-30 15:16:20 +00:00
Thomas Veerman
0e537f1085 AVFS: initialize root FS before receiving new work 2012-01-30 15:16:20 +00:00
Thomas Veerman
0bd011affd PM: extend srv_fork to set a specific UID
Currently, all servers and drivers run as root as they are forks of
RS. srv_fork now tells PM with which credentials to run the resulting
fork. Subsequently, PM lets VFS now as well.

This patch also fixes the following bugs:
 - RS doesn't initialize the setugid variable during exec, causing the
   servers and drivers to run setuid rendering the srv_fork extension
   useless.
 - PM erroneously tells VFS to run processes setuid. This doesn't
   actually lead to setuid processes as VFS sets {r,e}uid and {r,e}gid
   properly before checking PM's approval.
2012-01-30 15:16:19 +00:00
Thomas Veerman
e894c9e1b5 Don't print events that happen often 2012-01-19 17:06:14 +00:00
Thomas Veerman
700641afb8 lseek should not yield a negative file position 2012-01-19 16:48:01 +00:00
Thomas Veerman
5691dca9f4 Don't try to find file position beyond double indirect blocks 2012-01-19 16:47:47 +00:00
Thomas Veerman
ddbdca6cdb Add support for survival of crashed FSs
When an FS crashes, VFS will clean up resources tied to that FS:
 - Pending requests to the FS are canceled (i.e., fail with EIO)
 - Threads waiting for a reply are stopped (i.e., fail with EIO)
 - Open files are marked invalid. Future operations on a file descriptor
   will cause EBADF errors.
 - vmnt entry is cleared, so in-flight system calls that got past the
   file descriptor check but not yet talking to the crashed FS, will
   fail with EIO.
 - The reference counter of the mount point is decreased, effectively
   removing the crashed FS from the file system tree. Descendants of
   this part of the tree are unreachable by means of a path, but can
   still be unmounted by feeding the block special file to unmount(2).

This patch also gets rid of the "not a known driver endpoint" messages
during shutdown.
2012-01-19 14:21:46 +00:00
Ben Gras
dd59d50944 mfs: mark blocks clean when invalidated
. it could happen that newly filled blocks were still marked
	  dirty
	. causing unnecessary i/o and the new warning of the superblock
	  being written
2012-01-18 17:51:04 +01:00
Thomas Veerman
a6d0ee24c3 Use correct value for _NSIG
User processes can send signals with number up to _NSIG. There are a few
signal numbers above that used by the kernel, but should explicitly not
be included in the range or range checks in PM will fail.

The system processes use a different version of sigaddset, sigdelset,
sigemptyset, sigfillset, and sigismember which does not include a range
check on signal numbers (as opposed to the normal functions used by normal
processes).

This patch unbreaks test37 when the boot image is compiled with GCC/Clang.
2012-01-16 11:42:29 +00:00
Thomas Veerman
a282e942bf INET: initialize timer to not-in-use 2012-01-16 11:09:46 +00:00
Thomas Veerman
f18dab92bf Remove unused variable 2012-01-16 10:12:29 +00:00
Thomas Veerman
078adc7ed7 Increase thread stack space for GCC compiled images 2012-01-16 10:12:29 +00:00
Thomas Veerman
e6c98c3c55 AVFS: Return actual last dir when path is named by a symlink
Last_dir didn't consider paths that end in a symlink and hence didn't
actually return the last_dir when provided with one. For example,
/var/log is a symlink to /usr/log. Issuing `>/var/log' would trigger
an assert in AVFS, because /var/ is not the actual last directory; /usr/
is.

Last_dir now verifies the final component is not a symlink. If it is, it
follows the symlink and restarts finding of the last the directory.
2012-01-16 10:12:29 +00:00
David van Moolenbroek
c89aaf7a87 vfs/avfs: renumber stat calls so as to be unique
The old stat call numbers are still supported for a while.
2012-01-14 00:27:07 +01:00
David van Moolenbroek
2c685f34e0 Cut PM out of the adddma/deldma/getdma call path 2012-01-14 00:27:06 +01:00
David van Moolenbroek
8cb7ba7951 Remove obsolete PROCSTAT/getsigset call. 2012-01-14 00:27:06 +01:00
Ben Gras
4668b84158 vm_remap_ro
- allows shared memory to be mapped in readonly

- ben@minix3.org & tom@minix3.org
2012-01-13 11:30:01 +00:00
Tomas Hruby
88f990e122 VM - vm_unmap() takes SELF as valid argument 2012-01-13 11:30:01 +00:00
Tomas Hruby
974452d4dd VM - clear vminhibit iff it was set 2012-01-13 11:30:01 +00:00
Thomas Veerman
a4d01f8a83 Fix tll state bug
When a lock has read-serialized and read-only locks, releasing the read-
serialized lock would not set the state to read-only when no other locks
were pending.
2012-01-12 11:30:24 +00:00
Ben Gras
7cd4002083 vm: clear map cache after kernel requests
. fixes a dirty tlb situation (i.e. random crashes)
	  on some hardware, seemingly new intel architectures
	  (e.g. my desktop i7 machine)
2012-01-11 01:15:35 +01:00
Evgeniy Ivanov
d6c5a1280e Convert s_block_size on MFSv3.
On MFSv3 s_block_size is stored on disk, hence bytes should be converted
on big endian.
2012-01-08 23:52:57 +04:00
David van Moolenbroek
c25e2eb0cf avfs: fix for root file system not being unmounted
Also no longer have avfs crash whenever a file system server crashes.
2012-01-04 14:10:10 +01:00
David van Moolenbroek
3e46876a73 hgfs: fix atime/mtime attribute setting bug
Reported and investigated by Antoine Leca.
2011-12-23 19:02:57 +01:00
David van Moolenbroek
80b03d929d hgfs: resolve gcc -W warnings 2011-12-23 19:01:56 +01:00
David van Moolenbroek
472a91708a Move hgfs.h to minix includes directory 2011-12-23 19:01:14 +01:00
Ben Gras
59ff5cbd87 mfs: clean flag
. also implement now-possible fsck -p option
    	. allows unconditional fsck -p invocation at startup,
    	  only checking each filesystem if not marked clean
    	. mounting unclean is allowed but is forced readonly
    	. updating the superblock while mounted is now not
    	  allowed by mfs - must be done (e.g. by fsck.mfs)
    	  on an unmounted fs
	. clean flag is unset by mfs on mounting, and set by
	  mfs on clean unmounting (if clean flag was set at
	  mount time)

Signed-off-by: Ben Gras <ben@minix3.org>
2011-12-22 16:53:32 +01:00
Ben Gras
9a664b4984 mfs: restore readonly mounting
. use dirty marking hooks to check and warn
	  when inodes/bufs are marked dirty on a readonly
	  mounted fs
	. add readonly mount checks to restore readonly
	  mounting

Signed-off-by: Ben Gras <ben@minix3.org>
2011-12-22 01:29:27 +01:00
Ben Gras
9b7d357ca1 mfs: use macros to mark blocks and inodes dirty
. No functional change
	. Only serves to get hooks to do checks in
	. e.g. should things be marked dirty when we are
	  mounted readonly

Signed-off-by: Ben Gras <ben@minix3.org>
2011-12-22 01:29:27 +01:00
Ben Gras
34a8901eb8 vfs,avfs: verify an interpreter was found on #! line
. if not, NULL *interp is dereferenced
2011-12-21 23:44:13 +01:00
Thomas Veerman
de5a9a3e8b AVFS: Use scratchpad instead of m_in to pass around file descriptors
Some code relies on having the file descriptor in m_in.fd. Consequently,
m_in is not only used to provide syscall parameters from user space to
VFS, but also as a global variable to store temporary data within VFS.
This has the ugly side effect that m_in gets overwritten during core
dumping.*

To work around this problem VFS now uses a so called "scratchpad" to
store temporary data that has to be globally accessible. This is a simple
table indexed by process number, just like fproc. The scratchpad allows
us to store the buffer pointer and buffer size for suspended system calls
(i.e., read, write, open, lock) instead of using fproc. This makes fproc
a bit smaller and fproc iterators a bit faster. Moreover, suspension of
processes becomes simpler altogether and suspended operations on pipes
are now less of a special case.

* This patch fixes a bug where due to unexpected m_in overwriting a
coredump would fail, and consequently resources are leaked. The coredump
was triggered with:
$ a() { a; }
$ a
2011-12-21 10:52:51 +00:00
Thomas Veerman
c89bc85009 Don't repeat out-of-space messages
This patch makes PFS, EXT2 and MFS print only once that they're out of
space. After freeing up space and running out of space again, the message
will be printed again also.
2011-12-21 10:47:28 +00:00
Thomas Veerman
54c0eb9aa6 Compare read/write buf size against SSIZE_MAX instead of "< 0"
The nbyte in read(int fildes, void *buf, size_t nbyte) is unsigned,
so although technically we're doing the same comparison, this is more
in line with POSIX.

The comparison was moved to read_write as that routine is used within
VFS to let it VFS write out coredumps.
2011-12-21 10:46:09 +00:00
Thomas Veerman
9f9f893123 Mark filp as in use on fd dup'ing 2011-12-21 10:45:29 +00:00
Thomas Veerman
94da86cbee Discard process' pending request upon incoming PM request
When a process wants something done from VFS, but VFS has no worker
threads available, the request is stored and executed later. However,
when PM also sends a request for that process at the same time, discard
the pending request from the process and give priority to PM. The request
PM sends is either an EXIT or a DUMPCORE request, so we're not interested
in executing the pending request anyway.
2011-12-12 08:20:35 +00:00
David van Moolenbroek
35cf8beb33 procfs: add /proc/dmap 2011-12-11 22:35:33 +01:00
David van Moolenbroek
aa712e7e73 IS: unbreak F6 2011-12-11 22:34:54 +01:00
David van Moolenbroek
6f374faca5 Add "expected size" parameter to getsysinfo()
This patch provides basic protection against damage resulting from
differently compiled servers blindly copying tables to one another.
In every getsysinfo() call, the caller is provided with the expected
size of the requested data structure. The callee fails the call if
the expected size does not match the data structure's actual size.
2011-12-11 22:34:14 +01:00
David van Moolenbroek
9701e9dfd2 Servers: cleanup of some gcc -W warnings 2011-12-11 22:33:37 +01:00
Thomas Veerman
26d359a30c Properly unlock on mount failure 2011-12-09 15:47:42 +00:00
Thomas Veerman
5cbbfc69e7 Change asserts with side effects into panics 2011-12-09 14:46:10 +00:00
Thomas Veerman
706873142e Fix dangling symlink resolving for AVFS and add test61 2011-12-09 10:34:23 +00:00
Thomas Veerman
0a61519eea Provide core dumping support for AVFS 2011-12-08 10:47:11 +00:00
David van Moolenbroek
9221586f37 vfs/avfs: req_newdriver should use fs_sendrec
Using sendrec directly only results in problems. While it is not
clear whether using fs_sendrec is the best option, it is at least
an improvement.

Also remove some legacy cruft.
2011-12-05 16:28:09 +01:00
David van Moolenbroek
ba19c83fd6 RS: support for endpoint-changing driver restarts 2011-12-05 16:28:07 +01:00
David van Moolenbroek
01015cc0e2 init: write boot entry to root wtmp
This unbreaks the fsck check on startup.
2011-12-05 13:56:16 +01:00
David van Moolenbroek
db087efac4 VFS/FS: REQ_NEW_DRIVER now provides a label 2011-11-30 19:05:26 +01:00
Thomas Veerman
b4fb061802 Implement issetugid syscall
Implement issetugid syscall and provide a test. This gets rid of the
scary "Unsecure. Implement me" warning during compilation.
2011-11-28 10:03:43 +00:00
Ben Gras
ef99a7a3dc vm: report cropped region sizes
. when reporting on regions, only report part of the
	  region (addr and length) that really has memory mapped
	  into it
	. to minimise core files
2011-11-26 15:12:17 +00:00
David van Moolenbroek
a9f89a7290 vfs/avfs: map O_ACCMODE to R_BIT|W_BIT on recovery 2011-11-24 13:57:36 +01:00
David van Moolenbroek
e8f944d3ca avfs: unbreak process termination on PM_DUMPCORE 2011-11-24 13:04:52 +01:00
David van Moolenbroek
b4d9ac91ba FS servers: fix dependencies broken in git-af01bda 2011-11-23 17:03:16 +01:00
David van Moolenbroek
b4d909d415 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.
2011-11-23 14:06:37 +01:00
David van Moolenbroek
1e1db53986 Introduce sys_getregs call, and let vfs use it 2011-11-22 02:07:33 +01:00
Adriana Szekeres
c30f014a89 gcore command to coredump a process 2011-11-22 22:07:41 +01:00
Adriana Szekeres
eaa29370f4 ELF core files 2011-11-22 22:07:40 +01:00
David van Moolenbroek
f29ba928cc isofs: unbreak lseek 2011-11-22 11:46:55 +01:00
Ben Gras
c24d15b2db pm: add mproc table sanity check feature
. make procfs check it
	. detects pm/procfs mismatches
	. was triggered by ack/clang pm/procfs:
	  add padding to mproc struct to align ack/clang layout
	  to fix this
2011-11-18 17:18:10 +01:00
David van Moolenbroek
85b8fbe72b More cleanup of minix/com.h. 2011-11-11 13:53:29 +01:00
David van Moolenbroek
af01bda509 libbdev: initial version
The "bdev" library provides basic primitives for file systems to talk
to block device drivers, hiding the details of the underlying protocol
and interaction model.

This version of libbdev is rather basic. It is planned to support the
following features in the long run:

 - asynchronous requests and replies;
 - recovery support for underlying block drivers;
 - retrying of failed I/O requests.

The commit also changes our block-based file systems (mfs, ext2, isofs)
to make use of libbdev.
2011-11-09 14:43:25 +01:00
David van Moolenbroek
0bb27bb0b1 Servers: remove ABI comment 2011-11-07 22:24:59 +01:00
David van Moolenbroek
b02c260ecb Miscellaneous legacy cleanup 2011-11-07 22:20:55 +01:00
David van Moolenbroek
2602861f23 Move optset.c into libsys; remove redundant copies 2011-11-07 16:16:08 +01:00
Ben Gras
c83a90e2f1 mfs: ditch global readahead 2011-11-06 19:15:12 +01:00
David van Moolenbroek
0812293b47 procfs: fix for PID reuse between updates
In certain cases, a process ID may be reused between two lazy updates
of procfs's PID table. If the new associated process slot has a lower
index than the old one, this will trigger an assert in vtreefs, as the
new PID name entry is added before the old one is removed. This patch
fixes the problem by always first removing old PID name entries before
adding new ones.

Bug reported by Stephen Hatton.
2011-11-01 23:50:55 +00:00
Arun Thomas
62841e2935 pm: remove dead minix_munmap functions 2011-11-02 18:43:59 +01:00
Thomas Veerman
65e54c23e3 PFS is also a system proc 2011-10-28 12:49:47 +00:00
Thomas Veerman
febb4403ff Reenable backcall detection 2011-10-27 15:29:37 +00:00
Thomas Veerman
823e42c3e3 Make AVFS deal intelligently with back calling FSes
PUFFS file systems need to make back calls for every operation we
send to them. Consequently, they cannot handle block reads and writes
themselves. Instead, the root file system has to do it (for now).

When the mount operation causes an FS to make a back call, AVFS now
concludes that every block read and write for that FS has to go
through the root file system.
2011-10-27 15:29:23 +00:00
Antoine LECA
b1c2329954 clean up PM_SCHEDULED 2011-10-25 16:37:21 +00:00
Thomas Veerman
9e21d55e37 err_code has to be preserved as well. Short term fix 2011-10-25 12:12:20 +00:00
Thomas Veerman
8c9e62b299 Revert to using flushtlb instead of invlpg
Somehow the usage of invlpg causes Minix to crash on Qemu. Reverting
temporarily until we have a proper fix.
2011-09-27 15:15:51 +00:00
Ben Gras
49532259e5 mfs: improve & simplify secondary cache logic
. fixes "!" errors when booting from cd
2011-09-23 15:02:20 +00:00
Ben Gras
833183a9e1 vm: undo accidental JUNKFREE on 2011-09-19 15:36:46 +00:00
Ben Gras
1dfd43ac27 boot e820 memory detection fixes 2011-09-19 13:36:03 +00:00
Arun Thomas
cb54d96eec Remove legacy boot monitor vars 2011-09-16 20:10:47 +02:00
Thomas Veerman
90cde23c19 Cleanup more resources upon exit 2011-09-16 10:16:57 +00:00
Thomas Veerman
1c928cf61a Remove debug print 2011-09-16 10:16:32 +00:00
Thomas Veerman
200b9d7339 Unmap drivers upon exit 2011-09-16 10:16:00 +00:00
Thomas Veerman
203937456e Fix off-by-one errors and increase PATH_MAX to 1024
In some places it was assumed that PATH_MAX does not include a
terminating null character.

Increases PATH_MAX to 1024 to get in sync with NetBSD. Required some
rewriting in AVFS to keep memory usage low (the stack in use by a thread
is very small).
2011-09-12 09:00:24 +00:00
Ben Gras
98233fa144 ext2: replace debug printf by assert 2011-09-09 16:33:55 +00:00
Ben Gras
4857d5d554 add -lminixfs with fs support routines
. move cache size heuristic from mfs there
	  so mfs and ext2 can share it
	. add vfs credentials retrieving function, with
	  backwards compatability from previous struct
	  format, to be used by both ext2 and mfs
	. fix for ext2 - STATICINIT was fed no.
	  of bytes instead of no. of elements, overallocating
	  memory by a megabyte or two for the superblock
2011-09-08 16:52:13 +00:00
Thomas Veerman
ce1a2793f9 Fix off-by-one error 2011-09-08 15:10:57 +00:00
Thomas Veerman
d4b72e81b2 Cleanup servers to make GCC/Clang a little happier 2011-09-08 13:57:03 +00:00
Thomas Veerman
f78fb05676 Check group range for sanity 2011-09-08 12:23:03 +00:00
Arun Thomas
8a0901c4cb Add MKTRACE 2011-09-07 17:52:48 +02:00
Thomas Veerman
7db039347a Make AVFS resilient against failing back calls 2011-09-06 10:38:16 +00:00
Thomas Veerman
8a266a478e Increase gid_t and uid_t to 32 bits
Increase gid_t and uid_t to 32 bits and provide backwards compatibility
where needed.
2011-09-05 13:56:14 +00:00
Thomas Veerman
fde9a258d0 Make dev_t 32-bits and provide backwards compatibility 2011-09-05 08:52:57 +00:00
Arun Thomas
4ca68d42a0 Add MKLIVEUPDATE and MKSTATECTL 2011-09-02 16:57:22 +02:00
Evgeniy Ivanov
4806f7c308 Fix ext2 symlink bug.
rip->i_size is a target length without trailing '\0'.

Reported by Ben Gras.
2011-08-29 21:54:25 +00:00
Thomas Veerman
7f24c2b3ca Unverbose mount 2011-08-26 15:49:37 +00:00
Thomas Veerman
78183bddff Let FSes exit themselves upon system shutdown
During shutdown all processes are semi-exited and FSes are unmounted.
This semi-exit causes trouble for FUSE mounts as they still need access
to file descriptors and working directory in order to unmount.
2011-08-26 15:17:53 +00:00
Thomas Veerman
8a73de51f1 Tell VFS how many requests an FS can handle concurrently 2011-08-26 12:47:43 +00:00
Thomas Veerman
30be017762 Store and use max concurrent requests 2011-08-26 12:47:43 +00:00
Thomas Veerman
c78308f469 Increase max number of arguments 2011-08-22 13:44:24 +00:00
Thomas Veerman
e09714ab53 Turn off block read debugs and turn on mount debugs 2011-08-22 13:24:35 +00:00
Thomas Veerman
4ee157f5ce Report error instead panicing 2011-08-22 13:08:38 +00:00
Thomas Veerman
1f28a4b83e Remove verbosity 2011-08-22 13:08:03 +00:00
Thomas Veerman
68011701bd Reduce block special file (thread) lock scope 2011-08-22 11:51:29 +00:00
Thomas Veerman
55d926cbaa Allow block special files to be file locked 2011-08-22 11:51:01 +00:00
Thomas Veerman
ae2159c371 Fix locking issues with back calls from FSes 2011-08-19 14:17:35 +00:00
Ben Gras
cc64313b80 is: stopgap for broken _USEVFS check 2011-08-17 16:27:46 +00:00
Ben Gras
f984dbba70 increase system-wide filename limit to 255
. move mfs-specific struct, constants to mfs/, so
	  mfs-specific, on-disk format structs and consts are
	  fully isolated from generic structs and functions
	. removes de and readfs utils
2011-08-17 16:00:01 +00:00
Thomas Veerman
a18a007361 Range fix from PFS 2011-08-17 13:42:38 +00:00
Thomas Veerman
a6bd3f4a22 Merge AVFS and APFS 2011-08-17 13:40:36 +00:00
Ben Gras
ee48228aa0 pfs: fix range check
. debugged and fixed by Jan Wieck
2011-08-17 12:39:33 +00:00
Evgeniy Ivanov
bc434254ea MFS: optimize dentry acllocation.
When search for free slot always cache position of last allocated slot,
so next time when need to allocate new slot, we can search from that
position.
2011-08-17 08:41:35 +00:00
Evgeniy Ivanov
13ded5339f Fix ext2 dentry allocation glitch.
When remove dentry, check if cached position is greater than removed
one.
2011-08-15 17:33:51 +00:00
Evgeniy Ivanov
426cddbb30 Add missing put_inode().
Fixes bug from a9a45cddc.
2011-08-15 16:20:06 +00:00
Ben Gras
35cc7fbeb8 kernel: invlpg facility
. only use for single-page invalidations initially
	. shows tiny but statistically significant performance
	  improvement; will be more helpful in certain VM debug
	  modes
2011-08-12 13:08:27 +00:00
Evgeniy Ivanov
55c6f3f507 Fix bugs in ext2 found by clang static analyzer 2011-08-12 12:38:53 +00:00
Arun Thomas
9602f63a72 pm: remove dead function 2011-08-11 17:51:27 +02:00
Evgeniy Ivanov
a9a45cddc4 Fix bugs found in MFS by clang static analyzer. 2011-08-10 20:47:16 +00:00
Arun Thomas
86b061078b Build gcov code only if MKCOVERAGE is yes 2011-08-09 10:39:33 +02:00
Ben Gras
d477a9ed82 vm/ipc: only report signals when it matters to ipc
. ipc wants to know about processes that get
	  signals, so that it can break blocking ipc operations
	. doing it for every single signal is wasteful
	  and causes the annoying 'no slot for signals' message
	. this fix tells vm on a per-process basis it (ipc)
	  wants to be notified, i.e. only when it does any ipc calls
	. move ipc config to separate config file while we're at it
2011-08-05 20:52:32 +00:00
Ben Gras
c4ea2a195c getsid() implementation 2011-08-02 22:16:59 +02:00
Arun Thomas
aaefc6f838 Add MKMCONTEXT option 2011-08-02 13:57:31 +02:00
Ben Gras
989934b37c rename -lutil to -lminixutil
. in preparation for netbsd -lutil
2011-08-01 14:32:14 +02:00
Thomas Veerman
7588db2691 Add support for VFS-FS transaction IDs 2011-07-27 15:49:42 +00:00
Thomas Veerman
ece4c9d565 Add DEV_CLONE_A dev type 2011-07-27 12:23:03 +00:00
Arun Thomas
530bd5d486 vfs/rs: for ELF, sep_id should be 0 2011-07-26 15:21:07 +02:00
Ben Gras
3dd7649ae7 RS: fix bug that overflows r_argv[]
. reported and debugged by Arne Welzel
	. problem is if there are too many args
	. there is a check, but then unconditional NULL termination
2011-07-21 08:08:22 +02:00
Arun Thomas
3eb22ca4d1 MK option to build only system image programs 2011-07-20 09:57:46 +02:00
Erik van der Kouwe
b1408f61b4 Sanity checks prevent VM panic for mmap, vm_remap and map_phys 2011-07-19 08:58:01 +02:00
Ben Gras
832f7f99fd vm: munmap fix leftover 2011-07-18 12:03:58 +02:00
Ben Gras
02081e4b62 rename mmap() and munmap()
. it's a good extra interface to have but doesn't
	  meet standardised functionality
	. applications (in pkgsrc) find it and expect
	  full functionality the minix mmap doesn't offter
	. on the whole probably better to hide these functions
	  (mmap and friends) until they are grown up; the base system
	  can use the new minix_* names
2011-07-16 13:01:19 +02:00
Ben Gras
85f6d866e6 rename mmap MAP_SHARED to MAP_IPC_SHARED
. MAP_SHARED was used to implement sysv shared memory
	. used to signal shareable memory region to VM
	. assumptions about this situation break when processes
	  use MAP_SHARED for its normal, standardised meaning
2011-07-15 18:10:50 +02:00
Evgeniy Ivanov
255ae85b1e Fix time modification on truncate()
POSIX truncate specification says "Upon successful completion, if
the *file size is changed*, this function shall mark for update the
st_ctime and st_mtime fields of the file." This patch prevents
changing of the date fields when the size stays the same.
2011-07-15 14:21:05 +00:00
Thomas Veerman
902e0e27e0 Don't panic if owner has vanished before reply 2011-07-15 14:11:34 +00:00
Ben Gras
253c293213 mfs<->vfs stat fallback for old vfs 2011-07-12 18:09:52 +02:00
Evgeniy Ivanov
ef0a265086 New stat structure.
* VFS and installed MFSes must be in sync before and after this change *

Use struct stat from NetBSD. It requires adding new STAT, FSTAT and LSTAT
syscalls. Libc modification is both backward and forward compatible.

Also new struct stat uses modern field sizes to avoid ABI
incompatibility, when we update uid_t, gid_t and company.
Exceptions are ino_t and off_t in old libc (though paddings added).
2011-07-12 16:39:55 +02:00
Arun Thomas
b956c8735e Fix GCC image building 2011-07-09 15:04:42 +02:00
Ben Gras
a9d15dd3e4 pm, vfs: don't print something for bogus calls 2011-07-05 13:21:48 +02:00
Ben Gras
9c01ceb576 introduce sqrt_approx() in -lsys
. use this to avoid -lm dependency in mfs
2011-07-04 02:51:12 +02:00
Ben Gras
86a226680b vfs: don't SUSPEND for unknown calls
. returning ENOSYS helps for implementing
	  new calls with forwards compatability
2011-07-02 17:19:13 +02:00
Arun Thomas
93ae43f577 boot: Add multiboot support
Not yet fully spec-compliant; work in progress
2011-06-24 17:21:51 +02:00
Gianluca Guida
cc17b27a2b Build NetBSD libc library in world in ELF mode.
3 sets of libraries are built now:
  . ack: all libraries that ack can compile (/usr/lib/i386/)
  . clang+elf: all libraries with minix headers (/usr/lib/)
  . clang+elf: all libraries with netbsd headers (/usr/netbsd/)

Once everything can be compiled with netbsd libraries and headers, the
/usr/netbsd hierarchy will be obsolete and its libraries compiled with
netbsd headers will be installed in /usr/lib, and its headers
in /usr/include. (i.e. minix libc and current minix headers set
will be gone.)

To use the NetBSD libc system (libraries + headers) before
it is the default libc, see:
   http://wiki.minix3.org/en/DevelopersGuide/UsingNetBSDCode
This wiki page also documents the maintenance of the patch
files of minix-specific changes to imported NetBSD code.

Changes in this commit:
  . libsys: Add NBSD compilation and create a safe NBSD-based libc.
  . Port rest of libraries (except libddekit) to new header system.
  . Enable compilation of libddekit with new headers.
  . Enable kernel compilation with new headers.
  . Enable drivers compilation with new headers.
  . Port legacy commands to new headers and libc.
  . Port servers to new headers.
  . Add <sys/sigcontext.h> in compat library.
  . Remove dependency file in tree.
  . Enable compilation of common/lib/libc/atomic in libsys
  . Do not generate RCSID strings in libc.
  . Temporarily disable zoneinfo as they are incompatible with NetBSD format
  . obj-nbsd for .gitignore
  . Procfs: use only integer arithmetic. (Antoine Leca)
  . Increase ramdisk size to create NBSD-based images.
  . Remove INCSYMLINKS handling hack.
  . Add nbsd_include/sys/exec_elf.h
  . Enable ELF compilation with NBSD libc.
  . Add 'make nbsdsrc' in tools to download reference NetBSD sources.
  . Automate minix-port.patch creation.
  . Avoid using fstavfs() as it is *extremely* slow and unneeded.
  . Set err() as PRIVATE to avoid name clash with libc.
  . [NBSD] servers/vm: remove compilation warnings.
  . u32 is not a long in NBSD headers.
  . UPDATING info on netbsd hierarchy
  . commands fixes for netbsd libc
2011-06-24 11:46:30 +02:00
Erik van der Kouwe
6e0f3b3bda Split off sys_umap_remote from sys_umap
sys_umap now supports only:
- looking up the physical address of a virtual address in the address space
  of the caller;
- looking up the physical address of a grant for which the caller is the
  grantee.

This is enough for nearly all umap users. The new sys_umap_remote supports
lookups in arbitrary address spaces and grants for arbitrary grantees.
2011-06-10 14:28:20 +00:00
Ben Gras
a77c2973b3 fix clang warnings -R in kernel/ and servers/ 2011-06-09 16:09:13 +02:00
Erik van der Kouwe
c2da8cb535 Globally enable -Wall warnings for GCC 2011-06-08 19:21:03 +00:00
Erik van der Kouwe
0cb22acbda Fix VM -Wall warnings and enable -Werror 2011-06-01 11:30:58 +02:00
Tomas Hruby
5582aae6d6 LWIP - removed __unused where inappropriate 2011-05-25 09:41:19 +02:00
Ben Gras
314d09adf7 fix clang warnings in servers/ 2011-05-12 22:23:02 +02:00
Ben Gras
674cd6fd48 larger i/o buffer for exec()
. makes exec() for large executables (e.g. clang, gcc)
    significantly faster

Thanks to Antoine Leca.
2011-05-12 19:12:28 +02:00
Arun Thomas
350b60661a ELF multiboot support 2011-05-04 18:51:43 +02:00
Thomas Veerman
aba392e630 Clean up and fix multiple bugs in select:
- Remove redundant code.
 - Always wait for the initial reply from an asynchronous select request,
   even if the select has been satisfied on another file descriptor or
   was canceled due to a serious error.
 - Restart asynchronous selects if upon reply from the driver turns out
   that there are deferred operations (and do not forget we're still
   interested in the results of the deferred operations).
 - Do not hang a non-blocking select when another blocking select on
   the same filp is still blocking.
 - Split blocking operations in read, write, and exceptions (i.e.,
   blocking on read does not imply the write will block as well).
 - Some loops would iterate over OPEN_MAX file descriptors instead of
   the "highest" file descriptor.
 - Use proper internal error return values.
 - A secondary reply from a synchronous driver is essentially the same
   as from an asynchronous driver (the only difference being how the 
   answer is received). Merge.
 - Return proper error code after a driver failure.
 - Auto-detect whether a driver is synchronous or asynchronous.
 - Remove some code duplication.
 - Clean up code (coding style, add missing comments, put all select
   related code together).
2011-04-13 13:25:34 +00:00
Thomas Veerman
f0740680cd Do not print an error message when a binary is corrupt 2011-04-12 13:09:19 +00:00
David van Moolenbroek
c51cd5fe91 Server/driver protocols: no longer allow third-party copies.
Before safecopies, the IO_ENDPT and DL_ENDPT message fields were needed
to know which actual process to copy data from/to, as that process may
not always be the caller. Now that we have full safecopy support, these
fields have become useless for that purpose: the owner of the grant is
*always* the caller. Allowing the caller to supply another endpoint is
in fact dangerous, because the callee may then end up using a grant
from a third party. One could call this a variant of the confused
deputy problem.

From now on, safecopy calls should always use the caller's endpoint as
grant owner. This fully obsoletes the DL_ENDPT field in the
inet/ethernet protocol. IO_ENDPT has other uses besides identifying the
grant owner though. This patch renames IO_ENDPT to USER_ENDPT, not only
because that is a more fitting name (it should never be used for I/O
after all), but also in order to intentionally break any old system
source code outside the base system. If this patch breaks your code,
fixing it is fairly simple:

- DL_ENDPT should be replaced with m_source;
- IO_ENDPT should be replaced with m_source when used for safecopies;
- IO_ENDPT should be replaced with USER_ENDPT for any other use, e.g.
  when setting REP_ENDPT, matching requests in CANCEL calls, getting
  DEV_SELECT flags, and retrieving of the real user process's endpoint
  in DEV_OPEN.

The changes in this patch are binary backward compatible.
2011-04-11 17:35:05 +00:00
Arun Thomas
cd9b4b46f4 libexec: return physaddr info from ELF headers 2011-04-07 12:22:36 +00:00
Tomas Hruby
b2c2dc72bc LWIP - Fix for dhcpd broadcast to work after boot
Dhcp only works if devices are configured with a broadcast source
address at the begining as it currently uses raw ip sockets and the
sockets sets the source address. It is a quick hack and proper hdcpd
fix is preferable
2011-04-07 07:44:27 +00:00