Commit Graph

227 Commits

Author SHA1 Message Date
dg
4aa33638eb Implemented kernel side of MNT_NOATIME mount option. This option disables
the file access time update on reads and can be useful in reducing
filesystem overhead in cases where the access time is not important (like
Usenet news spools).
1996-09-03 07:09:11 +00:00
bde
7d4c1814f6 Don't depend in the kernel on the gcc feature of doing arithmetic on
pointers of type `void *'.  Warn about this in future.
1996-08-31 14:48:13 +00:00
dyson
966cbc5d29 Even though this looks like it, this is not a complex code change.
The interface into the "VMIO" system has changed to be more consistant
and robust.  Essentially, it is now no longer necessary to call vn_open
to get merged VM/Buffer cache operation, and exceptional conditions
such as merged operation of VBLK devices is simpler and more correct.

This code corrects a potentially large set of problems including the
problems with ktrace output and loaded systems, file create/deletes,
etc.

Most of the changes to NFS are cosmetic and name changes, eliminating
a layer of subroutine calls.  The direct calls to vput/vrele have
been re-instituted for better cross platform compatibility.

Reviewed by: davidg
1996-08-21 21:56:23 +00:00
bde
4c9b9ce103 Don't use NULL in non-pointer contexts. 1996-07-12 04:12:25 +00:00
wollman
44f96ba698 Quiet a couple of -Wunused warnings. 1996-07-09 16:51:18 +00:00
dg
d82864f5a7 Fixed end condition for clustered reads.
Submitted by:	Kirk McKusick via Lite-2 and email
1996-06-25 03:00:44 +00:00
gpalmer
57c3ebc617 Clean up -Wunused warnings.
Reviewed by:		bde
1996-06-12 05:11:41 +00:00
dg
5026fc1c36 Moved the fsnode MALLOC to before the call to getnewvnode() so that the
process won't possibly block before filling in the fsnode pointer (v_data)
which might be dereferenced during a sync since the vnode is put on the
mnt_vnodelist by getnewvnode.

Pointed out by Matt Day <mday@artisoft.com>
1996-06-12 03:37:57 +00:00
gpalmer
c79cc630ed Clean up various compiler warnings. Most (if not all) were benign
Reviewed by:	bde
1996-05-08 04:29:08 +00:00
phk
04c1e3cc5c disksort() is gone, all drivers now use tqdisksort(). 1996-05-03 15:05:17 +00:00
phk
5a6fb3a7da removed:
CLBYTES PD_SHIFT PGSHIFT NBPG PGOFSET CLSIZELOG2 CLSIZE pdei()
        ptei() kvtopte() ptetov() ispt() ptetoav() &c &c
new:
        NPDEPG

Major macro cleanup.
1996-05-02 14:21:14 +00:00
bde
82c1afdaa1 Removed bogus _BEGIN_DECLS/_END_DECLS.
Removed unused struct tag declarations in cloned code.

Added or cleaned up idempotency ifdefs.
1996-05-01 02:16:17 +00:00
bde
8831d940d6 Yet more b_flags fixes. The previous ones broke the clearing of B_DONE
and B_READ before writing.  This was was fatal.  They also broke the
clearing of B_INVAL before doing i/o.  This didn't actually matter.

Submitted by:	mostly by joerg
1996-04-19 19:34:19 +00:00
phk
eacbf55fca Replace usage of buf->b_actf by queue.3 and buf->b_act 1996-04-08 07:54:51 +00:00
bde
a0131ad117 Fixed reference counting related to relookup(). relookup() must
be called with the directory referenced, and this reference will
be dropped iff relookup() fails, so the value returned must not be
ignored.

Reviewed by:	davidg
1996-03-29 12:30:30 +00:00
hsu
3208691ff0 Make type compatible with Lite2.
Submitted by:	bde
1996-03-27 07:58:57 +00:00
dyson
e817145c4a Handle the bogus device that MFS uses as its VBLK device. We now don't
try to VMIO open it on MFS mounts.  This will fix the mfs_badops
panic.
1996-03-02 22:18:34 +00:00
dyson
b7119381dd Enable VMIO for non-VDIR metadata and block device. 1996-03-02 03:45:12 +00:00
dyson
5f6f44df5a More b_flags fixes. 1996-03-02 01:49:51 +00:00
dyson
0d3859fc48 Fix a bug that b_flags was getting unnecessarily modified by
the slice code.  The effect up to now has been insignficant, but
improved buffer allocation code will break with this problem.
1996-03-01 19:01:04 +00:00
mpp
e1d2af37f6 Add a prototype for the quotactl system call. 1996-02-27 07:57:57 +00:00
bde
5183c3b725 Removed vestigial support for the obsolete FIFO option. In ext2fs
it caused null pointer panics for all fifo operations unless FIFO
was defined.
1996-02-25 20:12:36 +00:00
mpp
f3dd75a38d Fix a bunch of spelling errors in the comment fields of
a bunch of system include files.
1996-01-30 23:02:38 +00:00
dyson
8fc8a772af Eliminated many redundant vm_map_lookup operations for vm_mmap.
Speed up for vfs_bio -- addition of a routine bqrelse to greatly diminish
	overhead for merged cache.
Efficiency improvement for vfs_cluster.  It used to do alot of redundant
	calls to cluster_rbuild.
Correct the ordering for vrele of .text and release of credentials.
Use the selective tlb update for 486/586/P6.
Numerous fixes to the size of objects allocated for files.  Additionally,
	fixes in the various pagers.
Fixes for proper positioning of vnode_pager_setsize in msdosfs and ext2fs.
Fixes in the swap pager for exhausted resources.  The pageout code
	will not as readily thrash.
Change the page queue flags (PG_ACTIVE, PG_INACTIVE, PG_FREE, PG_CACHE) into
	page queue indices (PQ_ACTIVE, PQ_INACTIVE, PQ_FREE, PQ_CACHE),
	thereby improving efficiency of several routines.
Eliminate even more unnecessary vm_page_protect operations.
Significantly speed up process forks.
Make vm_object_page_clean more efficient, thereby eliminating the pause
	that happens every 30seconds.
Make sequential clustered writes B_ASYNC instead of B_DELWRI even in the
	case of filesystems mounted async.
Fix a panic with busy pages when write clustering is done for non-VMIO
	buffers.
1996-01-19 04:00:31 +00:00
bde
d1eb245b0a Partially fixed negative and truncated "Avail" counts in df output.
This fixes PR943.

ffs/ffs_vfsops.c:
ffs_statfs() multiplied by (100 - minfree) as part of calculating the
minfree percentage (complemented in 100%), so with the standard minfree
of 8, it was broken for file systems of size >= 1TB/92 = 11GB.  Use the
standard freespace() macro instead.  This also fixes a rounding bug (the
"Avail" count was sometimes 1 too small).

ffs/* (not fixed):
The freespace() macro multiplies by minfree, so with the standard
minfree of 8, it is broken for file systems of size >= 1TB/8 = 128GB.
This bug is more serious since it affects block allocation.

ffs/ffs_alloc.c (not fixed):
Ordinary users are sometimes allowed to allocate 1 (partial) block
too many so that the "Avail" count goes negative.  E.g., if there is
1 fragment available and the file is fairly large, one more full
block is allocated.

df/df.c:
ufs_df() used/uses essentially the same code as ffs_statfs(), so it
had/has the same bugs.

ufs_df() gratuitously replaced "Avail" counts of < 0 by 0, so it
gave different results for non-mounted file systems in this case.
1996-01-14 18:55:09 +00:00
phk
49eb1a9309 The second cast wasn't needed.
Submitted by:	bde
1996-01-07 09:42:36 +00:00
phk
58e6a188de Fix the asami&phk bug. This was a sign-extension bug, where a long
got multiplied by a constant before being upgraded to long long.
This should fix kern/104 and possibly kern/105.
Thanks to: dyson & asami.
1996-01-06 12:49:53 +00:00
wollman
26b6c4cd73 Convert QUOTA to new-style option. 1996-01-05 18:31:58 +00:00
wollman
39d3a9a3d3 Convert DDB to new-style option. 1996-01-04 21:13:23 +00:00
peter
ab124e78b0 recording cvs-1.6 file death 1995-12-30 19:02:48 +00:00
bde
b58d77177b Fixed prototyping and staticizing for -DDEBUG case. 1995-12-22 17:56:37 +00:00
phk
1ba09babf4 Staticize. 1995-12-22 15:58:56 +00:00
phk
2a5a36a028 Staticize. 1995-12-17 21:14:36 +00:00
peter
1bce25d080 Silence a harmless warning... 1995-12-15 03:36:25 +00:00
bde
a8e8429b6c Included <sys/conf.h> and updated to indirect devswitches so that
this compiles again, and added a prototype.
1995-12-14 20:16:15 +00:00
peter
13e9bc1430 *hack alert*! :-) This adds an option to the MFS_ROOT code so that it
is possible to boot a kernel with an empty in-core MFS image, and have
it load the image from floppy directly.  This is admittedly a hack and
would be better replaced by a self-loading ram-disk.
1995-12-14 14:25:03 +00:00
dyson
601ed1a4c0 Changes to support 1Tb filesizes. Pages are now named by an
(object,index) pair instead of (object,offset) pair.
1995-12-11 04:58:34 +00:00
dg
c30f46c534 Untangled the vm.h include file spaghetti. 1995-12-07 12:48:31 +00:00
bde
22ab856887 Fixed compilation of lfs utilities which I broke the other day by
#including lfs_extern.h and goop to support it in lfs_conv.c.
1995-12-06 19:46:37 +00:00
bde
3688cbda94 Completed function declarations and/or added prototypes and/or #includes
to get the prototypes.
1995-12-03 11:17:15 +00:00
bde
202779fd7e Removed bogus __BEGIN_DECS/__END_DECLS. 1995-11-28 07:23:09 +00:00
peter
26bbc85eee After having put on my Asbestos suit, complete the MFS_ROOT part of Terry's
mountroot changes.  This means that the mfs_initminiroot functionality
into the root mfs_mount....
1995-11-28 03:15:58 +00:00
peter
17cfbbe7df Attempt to solve the busy-buffers-on-shutdown caused by MFS once and for all.
What was happening, was that the main mfs loop was sleeping, and when it was
being awoken by a wakeup when it was supposed to process some IO requests.

The problem was that if it was being woken out of the tsleep() by a signal
at shutdown, it was going straight into dounmount() without servicing any
pending IO requests, causing dounmount() to fail because there were busy
buffers (and they could not be "processed" because the processing loop was
trying to unmount rather than dispatching into mfs_doio()).

This (dare I say it :-) appears to be a layering problem....
1995-11-28 02:15:29 +00:00
dyson
711711e9f3 Update the wd.c driver to use the new TAILQ scheme for device
buffer queue.  Also, create a new subroutine 'tqdisksort' that
is an improved version of the original disksort that also uses
TAILQs.
1995-11-23 07:24:41 +00:00
bde
24ce87cc75 Completed function declarations and/or added prototypes. 1995-11-21 12:55:26 +00:00
phk
9f8979d178 Fix compiler warnings. 1995-11-20 12:25:37 +00:00
dyson
13fde74b24 General fixes to the vfs clustring code:
1) Make cluster buffer list be a non-malloced chain.  This eliminates
yet another 'evil' M_WAITOK and generally cleans up the code.
2) Fix write clustering for ext2fs.  It was just broken.  Also, ffs
clustering had an efficiency problem that more bawrites were happening
than should have been.
3) Make changes to buf.h to support the above, plus remove b_pfcent
at the request of David Greenman.

Note that the reallocblocks code is disabled pending rewrite for
the cluster buffer list changes.
1995-11-19 19:55:26 +00:00
dyson
346903d48d Change incorrect '#if EXT2FS' to '#ifdef EXT2FS' 1995-11-19 19:46:23 +00:00
phk
df7c5ad2a5 Get rid of the last debug sysctl variables of the old style. 1995-11-14 09:40:06 +00:00
bde
aa9a60640e Included <sys/sysproto.h> to get central declarations for syscall args
structs and prototypes for syscalls.

Ifdefed duplicated decentralized declarations of args structs.  It's
convenient to have this visible but they are hard to maintain.  Some
are already different from the central declarations.  4.4lite2 puts
them in comments in the function headers but I wanted to avoid the
large changes for that.
1995-11-12 06:43:28 +00:00
bde
449a11eb88 Introduced a type `vop_t' for vnode operation functions and used
it 1138 times (:-() in casts and a few more times in declarations.
This change is null for the i386.

The type has to be `typedef int vop_t(void *)' and not `typedef
int vop_t()' because `gcc -Wstrict-prototypes' warns about the
latter.  Since vnode op functions are called with args of different
(struct pointer) types, neither of these function types is any use
for type checking of the arg, so it would be preferable not to use
the complete function type, especially since using the complete
type requires adding 1138 casts to avoid compiler warnings and
another 40+ casts to reverse the function pointer conversions before
calling the functions.
1995-11-09 08:17:23 +00:00
dyson
6190778944 This commit causes UFS to perform at Linux EXT2FS metadata rates. After
earlier discussions with DG, and a recent email exchange with SEF, I
decided to allow UFS to run wide-open on an experimental basis.  We
will probably support eventually multiple async modes, and this is
the fastest the we can expect.  Just use the -o async flag on the
UFS mount.  Good luck...
1995-11-06 03:21:41 +00:00
dyson
aa3705d78b Changes to existing files for ext2fs support. The UFS mods need rework
in the future as they are a bit crufty -- but at least the stuff is in the
tree now.
1995-11-05 23:36:07 +00:00
dyson
b345e18c93 Fix ufs_bmap so that triple indirect blocks might work.
Submitted by:	Godmar Back <gback@facility.cs.utah.edu>
1995-11-05 23:07:37 +00:00
dyson
cfa6fda252 Make MNT_ASYNC more effective for UFS. It should not be too much more
dangerous than the original MNT_ASYNC.  There might be some minor
security considerations due to data writes not being posted as promptly
as before.  Meta-data operations are still not quite as fast as Linux,
but streaming I/O is still higher.
1995-11-05 21:01:15 +00:00
peter
c35184f705 mfs_open could panic with false identification: panic("mfs_ioctl: .... 1995-10-31 10:45:48 +00:00
dyson
b1a28fda3c Finalize GETPAGES layering scheme. Move the device GETPAGES
interface into specfs code.  No need at this point to modify the
PUTPAGES stuff except in the layered-type (NULL/UNION) filesystems.
1995-10-23 02:23:29 +00:00
dg
b5341559e2 Moved the filesystem read-only check out of the syscalls and into the
filesystem layer, as was done in lite-2. Merged in some other cosmetic
changes while I was at it. Rewrote most of msdosfs_access() to be more
like ufs_access() and to include the FS read-only check.

Obtained from: partially from 4.4BSD-lite2
1995-10-22 09:32:48 +00:00
bde
9674b45cfa Return EINVAL instead of panicing for rename("dir1", "dir2/..").
Fixes part of PR 760.

This bug seems to be very old.
1995-10-07 10:14:12 +00:00
phk
f449f1529f use roundup2 to avoid a bunch of 64bit divides. 1995-10-06 09:56:51 +00:00
dyson
667fe1779b Re-enable read clustering. 1995-09-25 06:00:59 +00:00
dg
ee52758175 Shit! I changed the wrong doclusterread! ...Thanks to Steven Wallace and
Poul-Henning for convincing me that I should look at my mistake! :-)
1995-09-22 06:02:40 +00:00
dg
c1d2ad6c46 Disable file read clustering until the bug(s) in vfs_cluster.c are fixed.
This should temporarily fix the sig 10/11 problems that people have been
having for the past 3 weeks.
1995-09-22 00:05:46 +00:00
bde
c7c302cc62 Remove transitory labelling code. Labels are now handled by essentially
the original 4.4lite code.  Machine Specific Partitions are now handled
separately.
1995-09-16 17:04:06 +00:00
bde
c9f41717da Fix benign type mismatch in a call to VOP_BMAP(). 1995-09-11 15:56:46 +00:00
julian
b621bdb825 Obtained from:4.4lite2
fix a change where a shortcut resulted in teh wrong answer..

e.g.
touch a
touch b
mv a b
resulted in b being removed and a being moved to b

in the shortcut..
touch a
ln a b
mv a b
the wrong link was removed..
leaving a instead of b, giving a different result to when
both files were separate.
1995-09-09 01:43:49 +00:00
dg
719bf7a2c2 Slight optimization for the standard case of rotdelay=0. 1995-09-08 17:16:32 +00:00
dyson
2b3cebdb88 Correct a case in the ffs_getpages where a page is not found in
a sparse file and the page is zeroed but not set valid, clean.
1995-09-07 04:39:09 +00:00
dyson
55b8bdf1c8 Added indirect pointer for ffs_getpages, and added external declaration. 1995-09-06 05:41:17 +00:00
dyson
1ef3d3c648 Added new ffs_getpages routine. It isn't optimized yet, but FFS
now does it's own getpage -- instead of using the default routine
in vnode_pager.c.
1995-09-06 05:39:28 +00:00
dyson
791992935e Correct prototype for ufs_bmaparray() 1995-09-04 01:13:42 +00:00
dyson
251a16a6af Added VOP_GETPAGES/VOP_PUTPAGES and also the "backwards" block count
for VOP_BMAP.  Updated affected filesystems...
1995-09-04 00:21:16 +00:00
bde
cea39e287b Declare vfs_mountroot() in the right place. 1995-08-30 01:34:28 +00:00
bde
9d58b7eb43 Fix correct_writedisklabel() and writedisklabel(). Their setting of
bp->b_flags has been broken for many years:
a) they didn't set B_BUSY for doing i/o.  This has been fatal since
   1995/07/25 when biodone() started checking that B_BUSY is set.
b) they didn't set B_INVAL for releasing the buffer.  This at best
   just put a useless buffer in the LRU queue for a little while.

Fix a couple of spelling errors and complete a couple of function
pointer declarations.
1995-08-28 16:09:11 +00:00
julian
ebb726ec45 Reviewed by: julian with quick glances by bruce and others
Submitted by:	terry (terry lambert)
This is  a composite of 3 patch sets submitted by terry.
they are:
New low-level init code that supports loadbal modules better
some cleanups in the namei code to help terry in 16-bit character support
some changes to the mount-root code to make it a little more
modular..

NOTE: mounting root off cdrom or NFS MIGHT be broken as I haven't been able
to test those cases..

certainly mounting root of disk still works just fine..
mfs should work but is untested. (tomorrows task)

The low level init stuff includes a total rewrite of init_main.c
to make it possible for new modules to have an init phase by simply
adding an entry to a TEXT_SET (or is it DATA_SET) list. thus a new module can
be added to the kernel without editing any other files other than the
'files' file.
1995-08-28 09:19:25 +00:00
bde
0bdfde4001 Don't call VOP_UPDATE() with volatile timestamps. 1995-08-25 19:40:32 +00:00
dg
68e6a22cfc Fixed mfs reboot panic by never returning failure from mfs_start().
Obtained from:	4.4BSD-Lite2
1995-08-20 10:26:00 +00:00
bde
b31df09238 Make everything except the unsupported network sources compile cleanly
with -Wnested-externs.
1995-08-16 16:14:28 +00:00
dg
b6d06a9f5d Honor -async mount option when doing the inode update.
Obtained from:	4.4BSD-Lite2
1995-08-16 13:16:58 +00:00
dg
5b4b270015 Converted mountlist to a CIRCLEQ.
Partially obtained from: 4.4BSD-Lite2
1995-08-11 11:31:18 +00:00
dg
99714b736d On closer inspection, it turns out that all of the callers of disksort
are already at splbio()...so back out the last change to disksort.
1995-08-07 14:20:27 +00:00
dg
d14e60d279 Since buffers can be pulled off of the disk queue at interrupt time and
disksort is called at non-interrupt time and can be actively traversing
the list when that happens, there is a very small window of vulnerability.
Close it by protecting disksort with splbio().
1995-08-07 11:55:32 +00:00
dg
20100f1812 Use bdwrite() rather than brelse(). The cylinder group bitmap modification
is not preserved otherwise.
Note that this is a no-op in FreeBSD, however, as we have doreallocblks
disabled.

Submitted by:	Kirk McKusick
1995-08-07 08:16:32 +00:00
dg
c82996e4a7 Removed redundant call to vm_object_page_clean: this is already handled
by vfs_msync().
1995-08-06 11:59:48 +00:00
dg
cf5a823616 Removed redundant call to vm_object_page_clean - this is already done
in vfs_msync().
1995-08-06 11:56:42 +00:00
dg
060942c07e Use the correct flags (IO_SYNC -> B_SYNC) when deciding to do a sync or
async write in the section that changes the filesize. The bug resulted
in the updates always being async.

Obtained from:	4.4BSD-Lite2
1995-08-04 05:49:17 +00:00
dg
21cc29328e Removed my special-case hack for VOP_LINK and fixed the problem with the
wrong vp's ops vector being used by changing the VOP_LINK's argument order.
The special-case hack doesn't go far enough and breaks the generic
bypass routine used in some non-leaf filesystems. Pointed out by Kirk
McKusick.
1995-08-01 18:51:02 +00:00
bde
38a74a7bc2 Eliminate sloppy common-style declarations. There should be none left for
the LINT configuation.
1995-07-29 11:44:31 +00:00
dg
5d7eb9210c Since ufs_ihashget can block, the lock must be checked for each time
the function returns. Also, moved lock into .bss and made minor cosmetic
changes.

Submitted by:	Bruce Evans
1995-07-21 16:20:20 +00:00
dg
ab7b1f1cbf Implement a lock in ffs_vget to prevent a race condition where two processes
try allocate the same inode/vnode, causing a duplicate.

Submitted by:	Matt Dillon, slightly reworked by me.
1995-07-21 03:52:40 +00:00
dg
c8b0a7332c NOTE: libkvm, w, ps, 'top', and any other utility which depends on struct
proc or any VM system structure will have to be rebuilt!!!

Much needed overhaul of the VM system. Included in this first round of
changes:

1) Improved pager interfaces: init, alloc, dealloc, getpages, putpages,
   haspage, and sync operations are supported. The haspage interface now
   provides information about clusterability. All pager routines now take
   struct vm_object's instead of "pagers".

2) Improved data structures. In the previous paradigm, there is constant
   confusion caused by pagers being both a data structure ("allocate a
   pager") and a collection of routines. The idea of a pager structure has
   escentially been eliminated. Objects now have types, and this type is
   used to index the appropriate pager. In most cases, items in the pager
   structure were duplicated in the object data structure and thus were
   unnecessary. In the few cases that remained, a un_pager structure union
   was created in the object to contain these items.

3) Because of the cleanup of #1 & #2, a lot of unnecessary layering can now
   be removed. For instance, vm_object_enter(), vm_object_lookup(),
   vm_object_remove(), and the associated object hash list were some of the
   things that were removed.

4) simple_lock's removed. Discussion with several people reveals that the
   SMP locking primitives used in the VM system aren't likely the mechanism
   that we'll be adopting. Even if it were, the locking that was in the code
   was very inadequate and would have to be mostly re-done anyway. The
   locking in a uni-processor kernel was a no-op but went a long way toward
   making the code difficult to read and debug.

5) Places that attempted to kludge-up the fact that we don't have kernel
   thread support have been fixed to reflect the reality that we are really
   dealing with processes, not threads. The VM system didn't have complete
   thread support, so the comments and mis-named routines were just wrong.
   We now use tsleep and wakeup directly in the lock routines, for instance.

6) Where appropriate, the pagers have been improved, especially in the
   pager_alloc routines. Most of the pager_allocs have been rewritten and
   are now faster and easier to maintain.

7) The pagedaemon pageout clustering algorithm has been rewritten and
   now tries harder to output an even number of pages before and after
   the requested page. This is sort of the reverse of the ideal pagein
   algorithm and should provide better overall performance.

8) Unnecessary (incorrect) casts to caddr_t in calls to tsleep & wakeup
   have been removed. Some other unnecessary casts have also been removed.

9) Some almost useless debugging code removed.

10) Terminology of shadow objects vs. backing objects straightened out.
    The fact that the vm_object data structure escentially had this
    backwards really confused things. The use of "shadow" and "backing
    object" throughout the code is now internally consistent and correct
    in the Mach terminology.

11) Several minor bug fixes, including one in the vm daemon that caused
    0 RSS objects to not get purged as intended.

12) A "default pager" has now been created which cleans up the transition
    of objects to the "swap" type. The previous checks throughout the code
    for swp->pg_data != NULL were really ugly. This change also provides
    the rudiments for future backing of "anonymous" memory by something
    other than the swap pager (via the vnode pager, for example), and it
    allows the decision about which of these pagers to use to be made
    dynamically (although will need some additional decision code to do
    this, of course).

13) (dyson) MAP_COPY has been deprecated and the corresponding "copy
    object" code has been removed. MAP_COPY was undocumented and non-
    standard. It was furthermore broken in several ways which caused its
    behavior to degrade to MAP_PRIVATE. Binaries that use MAP_COPY will
    continue to work correctly, but via the slightly different semantics
    of MAP_PRIVATE.

14) (dyson) Sharing maps have been removed. It's marginal usefulness in a
    threads design can be worked around in other ways. Both #12 and #13
    were done to simplify the code and improve readability and maintain-
    ability. (As were most all of these changes)

TODO:

1) Rewrite most of the vnode pager to use VOP_GETPAGES/PUTPAGES. Doing
   this will reduce the vnode pager to a mere fraction of its current size.

2) Rewrite vm_fault and the swap/vnode pagers to use the clustering
   information provided by the new haspage pager interface. This will
   substantially reduce the overhead by eliminating a large number of
   VOP_BMAP() calls. The VOP_BMAP() filesystem interface should be
   improved to provide both a "behind" and "ahead" indication of
   contiguousness.

3) Implement the extended features of pager_haspage in swap_pager_haspage().
   It currently just says 0 pages ahead/behind.

4) Re-implement the swap device (swstrategy) in a more elegant way, perhaps
   via a much more general mechanism that could also be used for disk
   striping of regular filesystems.

5) Do something to improve the architecture of vm_object_collapse(). The
   fact that it makes calls into the swap pager and knows too much about
   how the swap pager operates really bothers me. It also doesn't allow
   for collapsing of non-swap pager objects ("unnamed" objects backed by
   other pagers).
1995-07-13 08:48:48 +00:00
dg
3c7c1dd62f 1) Converted v_vmdata to v_object.
2) Removed unnecessary vm_object_lookup()/pager_cache(object, TRUE) pairs
   after vnode_pager_alloc() calls - the object is already guaranteed to be
   persistent.
3) Removed some gratuitous casts.
1995-06-28 12:01:13 +00:00
dg
5d0d9f974b Fixed VOP_LINK argument order botch. 1995-06-28 07:06:55 +00:00
rgrimes
c86f0c7a71 Remove trailing whitespace. 1995-05-30 08:16:23 +00:00
phk
48a749d725 Mount MFS as root RW. Remounting doesn't make sense.
Reviewed by:	davidg
1995-05-29 03:27:37 +00:00
dg
9e52c97c63 Kill bogus vnode_pager_setsize(). It was being called at the wrong time
and resulted in the object size being too small. This caused bad things
to happen later when the file was mapped.

Reviewed by:	John Dyson
1995-05-28 04:32:23 +00:00
dg
2045200a00 Changes to fix the following bugs:
1) Files weren't properly synced on filesystems other than UFS. In some
   cases, this lead to lost data. Most likely would be noticed on NFS.
   The fix is to make the VM page sync/object_clean general rather than
   in each filesystem.
2) Mixing regular and mmaped file I/O on NFS was very broken. It caused
   chunks of files to end up as zeroes rather than the intended contents.
   The fix was to fix several race conditions and to kludge up the
   "b_dirtyoff" and "b_dirtyend" that NFS relies upon - paying attention
   to page modifications that occurred via the mmapping.

Reviewed by:	David Greenman
Submitted by:	John Dyson
1995-05-21 21:39:31 +00:00
dg
240701b33f NFS diskless operation was broken because swapdev_vp wasn't initialized.
These changes solve the problem in a general way by moving the
initialization out of the individual fs_mountroot's and into swaponvp().

Submitted by:	Poul-Henning Kamp
1995-05-19 03:27:08 +00:00
dg
138edd5273 Fixed incompleteness that would allow dirty filesystems to get mounted
when the single user shell was terminated. These changes disallow mounting
or R/W upgrading filesystems that are dirty unless "-f" (force) option
is used with mount. /etc/rc has been modified to abort the startup if
one or more non-nfs partitions fail to mount.

Reviewed by:	Poul-Henning Kamp, Rod Grimes
1995-05-15 08:39:37 +00:00
dg
4c12c11b83 From Bruce Evans:
I ran into another manifestation of the problem reported in PR 211 and
fixed it. Try this:

as non-root:
	cd /tmp; mkdir x y x/z
as root:
	chown root /tmp/x/z
as non-root:
	cd /tmp/x; mv z ../y		# EACCES as expected
as root:
	cd /tmp/x; mv z ../y		# EINVAL NOT as expected

This is because ufs_rename() sets IN_RENAME and fails to clear it.

Reviewed by:	davidg
Submitted by:	bde
1995-05-15 07:31:09 +00:00