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4221e284a3
freebsd-dev/sys/kern
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Alan Cox 4221e284a3 The VFS/BIO subsystem contained a number of hacks in order to optimize 
piecemeal, middle-of-file writes for NFS.  These hacks have caused no
end of trouble, especially when combined with mmap().  I've removed
them.  Instead, NFS will issue a read-before-write to fully
instantiate the struct buf containing the write.  NFS does, however,
optimize piecemeal appends to files.  For most common file operations,
you will not notice the difference.  The sole remaining fragment in
the VFS/BIO system is b_dirtyoff/end, which NFS uses to avoid cache
coherency issues with read-merge-write style operations.  NFS also
optimizes the write-covers-entire-buffer case by avoiding the
read-before-write.  There is quite a bit of room for further
optimization in these areas.

The VM system marks pages fully-valid (AKA vm_page_t->valid =
VM_PAGE_BITS_ALL) in several places, most noteably in vm_fault.  This
is not correct operation.  The vm_pager_get_pages() code is now
responsible for marking VM pages all-valid.  A number of VM helper
routines have been added to aid in zeroing-out the invalid portions of
a VM page prior to the page being marked all-valid.  This operation is
necessary to properly support mmap().  The zeroing occurs most often
when dealing with file-EOF situations.  Several bugs have been fixed
in the NFS subsystem, including bits handling file and directory EOF
situations and buf->b_flags consistancy issues relating to clearing
B_ERROR & B_INVAL, and handling B_DONE.

getblk() and allocbuf() have been rewritten.  B_CACHE operation is now
formally defined in comments and more straightforward in
implementation.  B_CACHE for VMIO buffers is based on the validity of
the backing store.  B_CACHE for non-VMIO buffers is based simply on
whether the buffer is B_INVAL or not (B_CACHE set if B_INVAL clear,
and vise-versa).  biodone() is now responsible for setting B_CACHE
when a successful read completes.  B_CACHE is also set when a bdwrite()
is initiated and when a bwrite() is initiated.  VFS VOP_BWRITE
routines (there are only two - nfs_bwrite() and bwrite()) are now
expected to set B_CACHE.  This means that bowrite() and bawrite() also
set B_CACHE indirectly.

There are a number of places in the code which were previously using
buf->b_bufsize (which is DEV_BSIZE aligned) when they should have
been using buf->b_bcount.  These have been fixed.  getblk() now clears
B_DONE on return because the rest of the system is so bad about
dealing with B_DONE.

Major fixes to NFS/TCP have been made.  A server-side bug could cause
requests to be lost by the server due to nfs_realign() overwriting
other rpc's in the same TCP mbuf chain.  The server's kernel must be
recompiled to get the benefit of the fixes.

Submitted by:	Matthew Dillon <dillon@apollo.backplane.com>
1999-05-02 23:57:16 +00:00
..
bus_if.m Bring the 'new-bus' to the i386. This extensively changes the way the 1999-04-16 21:22:55 +00:00
device_if.m My changes to the new device interface: 1998-11-14 21:58:51 +00:00
imgact_aout.c Restore support for executing BSD/OS binaries on the i386 by passing 1999-04-03 22:20:03 +00:00
imgact_elf.c If you merge this into -stable, please increment __FreeBSD_version 1999-02-20 23:52:34 +00:00
imgact_gzip.c *_execsw static structures cannot be const due to the way they interact 1999-01-29 22:59:43 +00:00
imgact_shell.c *_execsw static structures cannot be const due to the way they interact 1999-01-29 22:59:43 +00:00
inflate.c kzipboot uses kern/inflate.c outside the kernel by providing its own 1998-11-10 09:08:49 +00:00
init_main.c Set curproc at the end of proc0_init(). 1999-04-29 22:51:59 +00:00
init_sysent.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_acct.c Suser() simplification: 1999-04-27 11:18:52 +00:00
kern_clock.c Make the machdep.i8254_freq and machdep.tsc_freq sysctls modify the 1999-04-25 09:00:00 +00:00
kern_conf.c Call the module's unload handler before removing the device from the 1999-03-23 21:11:47 +00:00
kern_descrip.c s/static foo_devsw_installed = 0;/static int foo_devsw_installed;/. 1999-04-28 10:54:24 +00:00
kern_environment.c Fix warnings related to -Wall -Wcast-qual 1999-01-28 17:32:05 +00:00
kern_exec.c Suser() simplification: 1999-04-27 11:18:52 +00:00
kern_exit.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_fork.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_intr.c Stage 1 of a cleanup of the i386 interrupt registration mechanism. 1999-04-21 07:26:30 +00:00
kern_jail.c Add beer-ware license and $Id$ 1999-04-30 06:51:51 +00:00
kern_ktrace.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_linker.c Enable vmspace sharing on SMP. Major changes are, 1999-04-28 01:04:33 +00:00
kern_lock.c fix breakage for alphas. 1999-03-15 05:11:27 +00:00
kern_lockf.c Fix warnings in preparation for adding -Wall -Wcast-qual to the 1999-01-27 21:50:00 +00:00
kern_malloc.c Fix warnings in preparation for adding -Wall -Wcast-qual to the 1999-01-27 21:50:00 +00:00
kern_mib.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_module.c More -Wall / -Wcast-qual cleanup. Also, EXEC_SET can't use 1999-01-29 08:36:45 +00:00
kern_ntptime.c Suser() simplification: 1999-04-27 11:18:52 +00:00
kern_physio.c Use the reference counted PHOLD()/PRELE() rather than P_PHYSIO. 1999-04-06 03:04:47 +00:00
kern_proc.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_prot.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_random.c Stage 1 of a cleanup of the i386 interrupt registration mechanism. 1999-04-21 07:26:30 +00:00
kern_resource.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_shutdown.c Suser() simplification: 1999-04-27 11:18:52 +00:00
kern_sig.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_subr.c This solves a deadlock that can occur when read()ing into a file-mmap() 1999-03-12 03:09:29 +00:00
kern_synch.c The magic "no-cpu" cpu number is 0xff. Don't misrepresent cpu 1999-03-05 16:38:13 +00:00
kern_syscalls.c Move lkmnosys() from kern_lkm.c to here. 1999-01-17 18:58:04 +00:00
kern_sysctl.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
kern_tc.c Make the machdep.i8254_freq and machdep.tsc_freq sysctls modify the 1999-04-25 09:00:00 +00:00
kern_threads.c Removed bogus casts to c_caddr_t. This is part of terminating 1999-01-29 08:29:05 +00:00
kern_time.c Suser() simplification: 1999-04-27 11:18:52 +00:00
kern_timeout.c Fix callout_init(). This didn't have any practical effect since it 1999-03-06 22:27:02 +00:00
kern_xxx.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
ksched.c 1. Add new defs for mins and maxs for the POSIX flavor priorities. They 1998-05-19 21:11:53 +00:00
link_aout.c Fix warnings in preparation for adding -Wall -Wcast-qual to the 1999-01-28 00:57:57 +00:00
link_elf_obj.c Cast to `const char *' instead of to c_caddr_t. This is part of 1999-01-29 09:04:27 +00:00
link_elf.c Cast to `const char *' instead of to c_caddr_t. This is part of 1999-01-29 09:04:27 +00:00
Make.tags.inc Update to know about current kernel directory layout. 1999-02-28 22:14:16 +00:00
makedevops.pl This routine was "use"ing File::Basename. This commit removes that 1999-05-02 08:55:27 +00:00
makedevops.sh Use the interface name as well as the method name when creating the method 1998-10-15 09:50:45 +00:00
Makefile Remove bogus architectures to allow make tags to work. 1996-03-31 18:53:43 +00:00
makesyscalls.sh Add trailing newline to sys/syscall.mk so that diff doesn't choke on it. 1998-06-28 10:01:52 +00:00
md5c.c This commit fixes various 64bit portability problems required for 1998-06-07 17:13:14 +00:00
p1003_1b.c Well folks, this is it - The second stage of the removal for build support 1999-04-17 08:36:07 +00:00
posix4_mib.c * Change sysctl from using linker_set to construct its tree using SLISTs. 1999-02-16 10:49:55 +00:00
subr_autoconf.c Fix a very long standing bug in run_interrupt_driven_config_hooks(). It 1999-04-25 22:13:34 +00:00
subr_blist.c Add new blist module - radix tree based bitmap allocator with 1999-01-21 08:11:06 +00:00
subr_bus.c GC some stray debugging printf()s... 1999-04-19 19:39:08 +00:00
subr_clist.c Cast pointers to uintptr_t/intptr_t instead of to u_long/long, 1998-07-15 02:32:35 +00:00
subr_devstat.c Staticize. 1999-04-11 02:27:06 +00:00
subr_disklabel.c Fix -Wuninitialized warning regarding zero-length var-args ctl element. 1998-12-14 05:37:37 +00:00
subr_diskmbr.c Fix warnings in preparation for adding -Wall -Wcast-qual to the 1999-01-28 01:59:53 +00:00
subr_diskslice.c Rename one of the two devfs_link's to devfs_makelink. 1998-12-10 19:57:01 +00:00
subr_dkbad.c In all such uses of struct buf: 's/b_un.b_addr/b_data/g' 1997-12-02 21:07:20 +00:00
subr_log.c The "easy" fixes for compiling the kernel -Wunused: remove unreferenced static 1998-12-07 21:58:50 +00:00
subr_module.c Align to sizeof(long) rather than sizeof(int32_t). It needs to be 1998-10-14 05:07:23 +00:00
subr_param.c Allow setting MAXFILES in the kernel config. 1999-04-09 16:28:11 +00:00
subr_prf.c Add snprintf(3) and vsnprintf(3) capability to the kernel. 1998-12-03 04:45:57 +00:00
subr_prof.c Fixed bogotification of pseudocode for syscall args by rev.1.53 of 1998-09-05 14:30:11 +00:00
subr_rlist.c This module was used only by the old swapper and has been #if'd out, 1999-01-21 08:58:41 +00:00
subr_rman.c Bring the 'new-bus' to the i386. This extensively changes the way the 1999-04-16 21:22:55 +00:00
subr_scanf.c Only needed to cast array index from char to unsigned char, did not 1999-02-14 20:58:21 +00:00
subr_smp.c Add a hook that can be called to initialise a slave processor's memory 1999-04-30 22:09:45 +00:00
subr_trap.c Enable vmspace sharing on SMP. Major changes are, 1999-04-28 01:04:33 +00:00
subr_xxx.c * Fix a couple of places in the device pager where an address was 1998-11-08 12:39:07 +00:00
sys_generic.c Add standard padding argument to pread and pwrite syscall. That should make them 1999-04-04 21:41:28 +00:00
sys_pipe.c Add standard padding argument to pread and pwrite syscall. That should make them 1999-04-04 21:41:28 +00:00
sys_process.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
sys_socket.c Add standard padding argument to pread and pwrite syscall. That should make them 1999-04-04 21:41:28 +00:00
syscalls.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
syscalls.master Add the jail system call. 1999-04-28 11:28:49 +00:00
sysv_ipc.c Change suser_xxx() to suser() where it applies. 1999-04-27 12:21:16 +00:00
sysv_msg.c Change suser_xxx() to suser() where it applies. 1999-04-27 12:21:16 +00:00
sysv_sem.c Change suser_xxx() to suser() where it applies. 1999-04-27 12:21:16 +00:00
sysv_shm.c Change suser_xxx() to suser() where it applies. 1999-04-27 12:21:16 +00:00
tty_compat.c This commit fixes various 64bit portability problems required for 1998-06-07 17:13:14 +00:00
tty_conf.c This commit fixes various 64bit portability problems required for 1998-06-07 17:13:14 +00:00
tty_cons.c s/static foo_devsw_installed = 0;/static int foo_devsw_installed;/. 1999-04-28 10:54:24 +00:00
tty_pty.c Suser() simplification: 1999-04-27 11:18:52 +00:00
tty_snoop.c Suser() simplification: 1999-04-27 11:18:52 +00:00
tty_subr.c Cast pointers to uintptr_t/intptr_t instead of to u_long/long, 1998-07-15 02:32:35 +00:00
tty_tb.c Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
tty_tty.c Added D_TTY to the cdevswitch flags for all tty drivers. This is required 1998-08-23 08:26:42 +00:00
tty.c Suser() simplification: 1999-04-27 11:18:52 +00:00
uipc_domain.c Redo domain registration to use SYSINITS rather than linker sets. 1999-04-26 08:56:09 +00:00
uipc_mbuf.c Typo in comment. 1999-04-12 10:07:15 +00:00
uipc_proto.c Register the local (unix domain) sockets ourselves. 1999-04-26 08:56:53 +00:00
uipc_sockbuf.c Port NetBSD's 19990120-accept bug fix. This works around the race condition 1999-01-25 16:58:56 +00:00
uipc_socket2.c Port NetBSD's 19990120-accept bug fix. This works around the race condition 1999-01-25 16:58:56 +00:00
uipc_socket.c Lite2 bugfixes merge: 1999-04-24 18:22:34 +00:00
uipc_syscalls.c Fix warnings in preparation for adding -Wall -Wcast-qual to the 1999-01-27 21:50:00 +00:00
uipc_usrreq.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
vfs_aio.c Enable vmspace sharing on SMP. Major changes are, 1999-04-28 01:04:33 +00:00
vfs_bio.c The VFS/BIO subsystem contained a number of hacks in order to optimize 1999-05-02 23:57:16 +00:00
vfs_cache.c Fix a braino in the v_id wraparound code. Give more (current) details 1999-04-24 17:58:14 +00:00
vfs_cluster.c The VFS/BIO subsystem contained a number of hacks in order to optimize 1999-05-02 23:57:16 +00:00
vfs_conf.c Remove the SLICE code. 1998-09-14 19:56:42 +00:00
vfs_default.c The VFS/BIO subsystem contained a number of hacks in order to optimize 1999-05-02 23:57:16 +00:00
vfs_export.c Reviewed by: Many at differnt times in differnt parts, 1999-03-12 02:24:58 +00:00
vfs_extattr.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
vfs_init.c * Register sysctl nodes before running sysinits when loading files and 1999-03-07 16:06:41 +00:00
vfs_lookup.c Fix warnings in preparation for adding -Wall -Wcast-qual to the 1999-01-28 00:57:57 +00:00
vfs_mount.c Remove the SLICE code. 1998-09-14 19:56:42 +00:00
vfs_subr.c Reviewed by: Many at differnt times in differnt parts, 1999-03-12 02:24:58 +00:00
vfs_syscalls.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
vfs_vnops.c This Implements the mumbled about "Jail" feature. 1999-04-28 11:38:52 +00:00
vnode_if.pl Declare static __inline functions as __inline in their forward 1999-02-28 11:30:00 +00:00
vnode_if.sh Declare static __inline functions as __inline in their forward 1999-02-28 11:30:00 +00:00
vnode_if.src Remove incorrect lock specs for vop_whiteout (introduced by Lite/2). 1999-03-27 03:08:07 +00:00