DragonFly BSD

CVS log for src/sys/sys/conf.h

[BACK] Up to [DragonFly] / src / sys / sys

Request diff between arbitrary revisions


Keyword substitution: kv
Default branch: MAIN


Revision 1.18: download - view: text, markup, annotated - select for diffs
Wed May 9 00:53:35 2007 UTC (7 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: HEAD, DragonFly_RELEASE_2_0_Slip, DragonFly_RELEASE_2_0, DragonFly_RELEASE_1_12_Slip, DragonFly_RELEASE_1_12, DragonFly_RELEASE_1_10_Slip, DragonFly_RELEASE_1_10, DragonFly_Preview
Diff to: previous 1.17: preferred, unified
Changes since revision 1.17: +4 -4 lines
Give the device major / minor numbers their own separate 32 bit fields
in the kernel.  Change dev_ops to use a RB tree to index major device
numbers and remove the 256 device major number limitation.

Build a dynamic major number assignment feature into dev_ops_add() and
adjust ASR (which already had a hand-rolled one), and MFS to use the
feature.  MFS at least does not require any filesystem visibility to
access its backing device.  Major devices numbers >= 256 are used for
dynamic assignment.

Retain filesystem compatibility for device numbers that fall within the
range that can be represented in UFS or struct stat (which is a single
32 bit field supporting 8 bit major numbers and 24 bit minor numbers).

Revision 1.17: download - view: text, markup, annotated - select for diffs
Tue May 8 02:31:43 2007 UTC (7 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.16: preferred, unified
Changes since revision 1.16: +10 -2 lines
Replace NOCDEV with NULL.  NOCDEV was ((void *)-1) and as inherited
from *BSD a long time ago due to the device pointer / device number
duality.  Now that the pointer and device number has been separated, we
can just use NULL to indicate no-pointer.

Replace si_refs with si_sysref.  Use SYSREF for ref-count cdev_t.  Enable
cdev_t reclamation on deletion.

Revision 1.16: download - view: text, markup, annotated - select for diffs
Mon May 7 05:21:42 2007 UTC (7 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.15: preferred, unified
Changes since revision 1.15: +4 -0 lines
Changes to consdev - low level kernel console initialization.

The consdev API was calling make_dev() extremely early in the boot sequence,
but except for a little code in syscons didn't really need the abstraction
to operate the kernel console during boot.

Change the consdev API to no longer require the use the device abstraction
to operate.  This will allow the device ABI (cdev_t) to be converted to
use SYSREF.

Revision 1.15: download - view: text, markup, annotated - select for diffs
Tue Sep 26 18:57:14 2006 UTC (7 years, 9 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_8_Slip, DragonFly_RELEASE_1_8
Diff to: previous 1.14: preferred, unified
Changes since revision 1.14: +1 -0 lines
Follow up to kern_conf.c 1.16.  We can't just ignore the ops comparison, it
is needed to keep user-invisible devices user-invisible.  Add a flag so
hashdev() knows when it can ignore the comparison and when it can't ignore
the comparison.

Revision 1.14: download - view: text, markup, annotated - select for diffs
Sun Sep 10 01:26:40 2006 UTC (7 years, 10 months ago) by dillon
Branches: MAIN
Diff to: previous 1.13: preferred, unified
Changes since revision 1.13: +14 -14 lines
Change the kernel dev_t, representing a pointer to a specinfo structure,
to cdev_t.  Change struct specinfo to struct cdev.  The name 'cdev' was taken
from FreeBSD.  Remove the dev_t shim for the kernel.

This commit generally removes the overloading of 'dev_t' between userland and
the kernel.

Also fix a bug in libkvm where a kernel dev_t (now cdev_t) was not being
properly converted to a userland dev_t.

Revision 1.13: download - view: text, markup, annotated - select for diffs
Sat Sep 9 19:07:29 2006 UTC (7 years, 10 months ago) by dillon
Branches: MAIN
Diff to: previous 1.12: preferred, unified
Changes since revision 1.12: +2 -2 lines
Rename struct specinfo into struct cdev.  Add a new typedef 'cdev_t' for cdev
pointers.  Temporarily retain dev_t for cdev pointers until the kernel can
be converted over to cdev_t.

Revision 1.12: download - view: text, markup, annotated - select for diffs
Sun Sep 3 17:43:59 2006 UTC (7 years, 10 months ago) by dillon
Branches: MAIN
Diff to: previous 1.11: preferred, unified
Changes since revision 1.11: +1 -1 lines
Rename functions to avoid conflicts with libc.

Revision 1.11: download - view: text, markup, annotated - select for diffs
Fri Jul 28 02:17:41 2006 UTC (7 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.10: preferred, unified
Changes since revision 1.10: +7 -129 lines
MASSIVE reorganization of the device operations vector.  Change cdevsw
to dev_ops.  dev_ops is a syslink-compatible operations vector structure
similar to the vop_ops structure used by vnodes.

Remove a huge number of instances where a thread pointer is still being
passed as an argument to various device ops and other related routines.
The device OPEN and IOCTL calls now take a ucred instead of a thread pointer,
and the CLOSE call no longer takes a thread pointer.

Revision 1.10: download - view: text, markup, annotated - select for diffs
Fri Feb 17 19:18:07 2006 UTC (8 years, 5 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_6_Slip, DragonFly_RELEASE_1_6
Diff to: previous 1.9: preferred, unified
Changes since revision 1.9: +5 -10 lines
Make the entire BUF/BIO system BIO-centric instead of BUF-centric.  Vnode
and device strategy routines now take a BIO and must pass that BIO to
biodone().  All code which previously managed a BUF undergoing I/O now
manages a BIO.

The new BIO-centric algorithms allow BIOs to be stacked, where each layer
represents a block translation, completion callback, or caller or device
private data.  This information is no longer overloaded within the BUF.
Translation layer linkages remain intact as a 'cache' after I/O has completed.

The VOP and DEV strategy routines no longer make assumptions as to which
translated block number applies to them.  The use the block number in the
BIO specifically passed to them.

Change the 'untranslated' constant to NOOFFSET (for bio_offset), and
(daddr_t)-1 (for bio_blkno).  Rip out all code that previously set the
translated block number to the untranslated block number to indicate
that the translation had not been made.

Rip out all the cluster linkage fields for clustered VFS and clustered
paging operations.  Clustering now occurs in a private BIO layer using
private fields within the BIO.

Reformulate the vn_strategy() and dev_dstrategy() abstraction(s).  These
routines no longer assume that bp->b_vp == the vp of the VOP operation, and
the dev_t is no longer stored in the struct buf.  Instead, only the vp passed
to vn_strategy() (and related *_strategy() routines for VFS ops), and
the dev_t passed to dev_dstrateg() (and related *_strategy() routines for
device ops) is used by the VFS or DEV code.  This will allow an arbitrary
number of translation layers in the future.

Create an independant per-BIO tracking entity, struct bio_track, which
is used to determine when I/O is in-progress on the associated device
or vnode.

NOTE: Unlike FreeBSD's BIO work, our struct BUF is still used to hold
the fields describing the data buffer, resid, and error state.

Major-testing-by: Stefan Krueger

Revision 1.9: download - view: text, markup, annotated - select for diffs
Mon Feb 21 18:56:02 2005 UTC (9 years, 5 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_Stable, DragonFly_RELEASE_1_4_Slip, DragonFly_RELEASE_1_4, DragonFly_RELEASE_1_2_Slip, DragonFly_RELEASE_1_2
Diff to: previous 1.8: preferred, unified
Changes since revision 1.8: +3 -0 lines
Track the last read and last write timestamp at the device level and modify
the stat code to retrieve the information.  This is so devices such as ttys
report the correct access/modified time for the 'w' and related utilities.
NOTE: the inode still needs to be updated at CLOSE time to record the last
accessed and modified times persistently, and this is not yet occuring.

This is necessary because device read/write now bypasses the filesystem VOP
code.

Revision 1.8: download - view: text, markup, annotated - select for diffs
Sun Jul 4 05:16:32 2004 UTC (10 years ago) by dillon
Branches: MAIN
CVS tags: DragonFly_Snap29Sep2004, DragonFly_Snap13Sep2004, DragonFly_1_0_REL, DragonFly_1_0A_REL
Diff to: previous 1.7: preferred, unified
Changes since revision 1.7: +1 -1 lines
When booting from CD, check cd1a and acd1a after cd0a and acd0a, allowing
a CD to be booted off of a second CDRom drive.

When checking for the same rootdev selection as already has been set,
only the major number of the existing rootdev was being checked.  This
prevent other unit numbers from being tried properly (e.g. trying cd1 after
having already tried cd0).

Completely parse the rootdev's (unit, slice, partition) tuple before
trying to look up the device, rather then assuming that devname(0,0,0)
will exist (this is no longer necessarily true).

Revision 1.7: download - view: text, markup, annotated - select for diffs
Wed May 19 22:53:02 2004 UTC (10 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_1_0_RC1
Diff to: previous 1.6: preferred, unified
Changes since revision 1.6: +40 -19 lines
Device layer rollup commit.

* cdevsw_add() is now required.  cdevsw_add() and cdevsw_remove() may specify
  a mask/match indicating the range of supported minor numbers.  Multiple
  cdevsw_add()'s using the same major number, but distinctly different
  ranges, may be issued.  All devices that failed to call cdevsw_add() before
  now do.

* cdevsw_remove() now automatically marks all devices within its supported
  range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created.  Instead,
  only v_udev (a newly added field) is resolved.  v_rdev is resolved when
  the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
  to the validity of devices associated with vnodes, primarily due to
  the persistence of a device structure due to being indexed by (major, minor)
  instead of by (cdevsw, major, minor).  In particular, if you run a program
  which connects to a USB device and then you pull the USB device and plug
  it back in, the vnode subsystem will continue to believe that the device
  is open when, in fact, it isn't (because it was destroyed and recreated).

  In particular, note that all the VFS mount procedures now check devices
  via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
  is NULL prior to the first open.

* The disk layer's device interaction has been rewritten.  The disk layer
  (i.e. the slice and disklabel management layer) no longer overloads
  its data onto the device structure representing the underlying physical
  disk.  Instead, the disk layer uses the new cdevsw_add() functionality
  to register its own cdevsw using the underlying device's major number,
  and simply does NOT register the underlying device's cdevsw.  No
  confusion is created because the device hash is now based on
  (cdevsw,major,minor) rather then (major,minor).

  NOTE: This also means that underlying raw disk devices may use the entire
  device minor number instead of having to reserve the bits used by the disk
  layer, and also means that can we (theoretically) stack a fully
  disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
  with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
  is removed.  Additionally, all udev2dev() lookups run through the cdevsw
  mask/match and only successfully find devices still associated with an
  active cdevsw.

* Major work on MFS:  MFS no longer shortcuts vnode and device creation.  It
  now creates a real vnode and a real device and implements real open and
  close VOPs.  Additionally, due to the disk layer changes, MFS is no longer
  limited to 255 mounts.  The new limit is 16 million.  Since MFS creates a
  real device node, mount_mfs will now create a real /dev/mfs<PID> device
  that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes.  The struct buf contains a b_dev field.
  In order to properly handle stacked devices we now require that the b_dev
  field be initialized before the device strategy routine is called.  This
  required some additional work in various VFS implementations.  To enforce
  this requirement, biodone() now sets b_dev to NODEV.  The new disk layer
  will adjust b_dev before forwarding a request to the actual physical
  device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

Revision 1.6: download - view: text, markup, annotated - select for diffs
Thu May 13 23:49:25 2004 UTC (10 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.5: preferred, unified
Changes since revision 1.5: +5 -2 lines
device switch 1/many: Remove d_autoq, add d_clone (where d_autoq was).

d_autoq was used to allow the device port dispatch to mix old-style synchronous
calls with new style messaging calls within a particular device.  It was never
used for that purpose.

d_clone will be more fully implemented as work continues.  We are going to
install d_port in the dev_t (struct specinfo) structure itself and d_clone
will be needed to allow devices to 'revector' the port on a minor-number
by minor-number basis, in particular allowing minor numbers to be directly
dispatched to distinct threads.  This is something we will be needing later
on.

Revision 1.5: download - view: text, markup, annotated - select for diffs
Tue Jul 22 17:03:34 2003 UTC (11 years ago) by dillon
Branches: MAIN
Diff to: previous 1.4: preferred, unified
Changes since revision 1.4: +55 -52 lines
DEV messaging stage 2/4: In this stage all DEV commands are now being
funneled through the message port for action by the port's beginmsg function.
CONSOLE and DISK device shims replace the port with their own and then
forward to the original.  FB (Frame Buffer) shims supposedly do the same
thing but I haven't been able to test it.   I don't expect instability
in mainline code but there might be easy-to-fix, and some drivers still need
to be converted.  See primarily: kern/kern_device.c (new dev_*() functions and
inherits cdevsw code from kern/kern_conf.c), sys/device.h, and kern/subr_disk.c
for the high points.

In this stage all DEV messages are still acted upon synchronously in the
context of the caller.  We cannot create a separate handler thread until
the copyin's (primarily in ioctl functions) are made thread-aware.

Note that the messaging shims are going to look rather messy in these early
days but as more subsystems are converted over we will begin to use
pre-initialized messages and message forwarding to avoid having to constantly
rebuild messages prior to use.

Note that DEV itself is a mess oweing to its 4.x roots and will be cleaned
up in subsequent passes.  e.g. the way sub-devices inherit the main device's
cdevsw was always a bad hack and it still is, and several functions
(mmap, kqfilter, psize, poll) return results rather then error codes, which
will be fixed since now we have a message to store the result in :-)

Revision 1.4: download - view: text, markup, annotated - select for diffs
Mon Jul 21 05:50:47 2003 UTC (11 years ago) by dillon
Branches: MAIN
Diff to: previous 1.3: preferred, unified
Changes since revision 1.3: +17 -11 lines
DEV messaging stage 1/4: Rearrange struct cdevsw and add a message port
and auto-queueing mask.  The mask will tell us which message functions
can be safely queued to another thread and which still need to run in the
context of the caller.   Primary configuration fields (name, cmaj, flags,
port, autoq mask) are now at the head of the structure.  Function vectors,
which may eventually go away, are at the end.  The port and autoq fields
are non-functional in this stage.

The old BDEV device major number support has also been removed from cdevsw,
and code has been added to translate the bootdev passed from the boot code
(the boot code has always passed the now defunct block device major numbers
and we obviously need to keep that compatibility intact).

Revision 1.3: download - view: text, markup, annotated - select for diffs
Mon Jun 23 17:55:50 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
CVS tags: PRE_MP
Diff to: previous 1.2: preferred, unified
Changes since revision 1.2: +9 -7 lines
proc->thread stage 2: MAJOR revamping of system calls, ucred, jail API,
and some work on the low level device interface (proc arg -> thread arg).
As -current did, I have removed p_cred and incorporated its functions
into p_ucred.  p_prison has also been moved into p_ucred and adjusted
accordingly.  The jail interface tests now uses ucreds rather then processes.

The syscall(p,uap) interface has been changed to just (uap).  This is inclusive
of the emulation code.  It makes little sense to pass a proc pointer around
which confuses the MP readability of the code, because most system call code
will only work with the current process anyway.  Note that eventually
*ALL* syscall emulation code will be moved to a kernel-protected userland
layer because it really makes no sense whatsoever to implement these
emulations in the kernel.

suser() now takes no arguments and only operates with the current process.
The process argument has been removed from suser_xxx() so it now just takes
a ucred and flags.

The sysctl interface was adjusted somewhat.

Revision 1.2: download - view: text, markup, annotated - select for diffs
Tue Jun 17 04:28:58 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.1: preferred, unified
Changes since revision 1.1: +1 -0 lines
Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids.  Most
ids have been removed from !lint sections and moved into comment sections.

Revision 1.1: download - view: text, markup, annotated - select for diffs
Tue Jun 17 02:55:50 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
CVS tags: FREEBSD_4_FORK
import from FreeBSD RELENG_4 1.103.2.6

Diff request

This form allows you to request diffs between any two revisions of a file. You may select a symbolic revision name using the selection box or you may type in a numeric name using the type-in text box.

Log view options