Commit Graph

37 Commits

Author SHA1 Message Date
Alan Cox
5786be7cc7 Introduce a field to struct vm_page for storing flags that are
synchronized by the lock on the object containing the page.

Transition PG_WANTED and PG_SWAPINPROG to use the new field,
eliminating the need for holding the page queues lock when setting
or clearing these flags.  Rename PG_WANTED and PG_SWAPINPROG to
VPO_WANTED and VPO_SWAPINPROG, respectively.

Eliminate the assertion that the page queues lock is held in
vm_page_io_finish().

Eliminate the acquisition and release of the page queues lock
around calls to vm_page_io_finish() in kern_sendfile() and
vfs_unbusy_pages().
2006-08-09 17:43:27 +00:00
Stephan Uphoff
6c1b7d16c2 Call vm_object_page_clean() with the object lock held.
Submitted by:	kensmith@
Reviewed by:	mohans@
MFC after:	6 days
2006-05-25 17:16:11 +00:00
Stephan Uphoff
dcf67e65d2 Do not set B_NOCACHE on buffers when releasing them in flushbuflist().
If B_NOCACHE is set the pages of vm backed buffers will be invalidated.
However clean buffers can be backed by dirty VM pages so invalidating them
can lead to data loss.
Add support for flush dirty page in the data invalidation function
of some network file systems.

This fixes data losses during vnode recycling (and other code paths
using invalbuf(*,V_SAVE,*,*)) for data written using an mmaped file.

Collaborative effort by: jhb@,mohans@,peter@,ps@,ups@
Reviewed by:	tegge@
MFC after:	7 days
2006-05-25 01:00:35 +00:00
Ruslan Ermilov
3238c6bd33 Fix -Wundef from compiling the amd64 LINT. 2005-12-04 10:06:06 +00:00
Jeff Roberson
8da0046596 - The VI_DOOMED flag now signals the end of a vnode's relationship with
the filesystem.  Check that rather than VI_XLOCK.
 - VOP_INACTIVE should no longer drop the vnode lock.
 - The vnode lock is required around calls to vrecycle() and vgone().

Sponsored by:	Isilon Systems, Inc.
2005-03-13 12:18:25 +00:00
Poul-Henning Kamp
e50508df66 Eliminate unused and constant arguments to smbfs_vinvalbuf() 2005-01-14 08:52:55 +00:00
Poul-Henning Kamp
7c0745eeae Eliminate unused and unnecessary "cred" argument from vinvalbuf() 2005-01-14 07:33:51 +00:00
Warner Losh
d167cf6f3a /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 18:10:42 +00:00
Poul-Henning Kamp
08dbd671ff Remove unused B_WRITEINPROG flag 2004-09-15 21:49:22 +00:00
Poul-Henning Kamp
066a8fea81 Explicitly pass vnode to smbfs_doio() function. 2004-09-07 08:53:28 +00:00
Alan Cox
5a32489377 Make vm_page's PG_ZERO flag immutable between the time of the page's
allocation and deallocation.  This flag's principal use is shortly after
allocation.  For such cases, clearing the flag is pointless.  The only
unusual use of PG_ZERO is in vfs_bio_clrbuf().  However, allocbuf() never
requests a prezeroed page.  So, vfs_bio_clrbuf() never sees a prezeroed
page.

Reviewed by:	tegge@
2004-05-06 05:03:23 +00:00
John Baldwin
91d5354a2c Locking for the per-process resource limits structure.
- struct plimit includes a mutex to protect a reference count.  The plimit
  structure is treated similarly to struct ucred in that is is always copy
  on write, so having a reference to a structure is sufficient to read from
  it without needing a further lock.
- The proc lock protects the p_limit pointer and must be held while reading
  limits from a process to keep the limit structure from changing out from
  under you while reading from it.
- Various global limits that are ints are not protected by a lock since
  int writes are atomic on all the archs we support and thus a lock
  wouldn't buy us anything.
- All accesses to individual resource limits from a process are abstracted
  behind a simple lim_rlimit(), lim_max(), and lim_cur() API that return
  either an rlimit, or the current or max individual limit of the specified
  resource from a process.
- dosetrlimit() was renamed to kern_setrlimit() to match existing style of
  other similar syscall helper functions.
- The alpha OSF/1 compat layer no longer calls getrlimit() and setrlimit()
  (it didn't used the stackgap when it should have) but uses lim_rlimit()
  and kern_setrlimit() instead.
- The svr4 compat no longer uses the stackgap for resource limits calls,
  but uses lim_rlimit() and kern_setrlimit() instead.
- The ibcs2 compat no longer uses the stackgap for resource limits.  It
  also no longer uses the stackgap for accessing sysctl's for the
  ibcs2_sysconf() syscall but uses kernel_sysctl() instead.  As a result,
  ibcs2_sysconf() no longer needs Giant.
- The p_rlimit macro no longer exists.

Submitted by:	mtm (mostly, I only did a few cleanups and catchups)
Tested on:	i386
Compiled on:	alpha, amd64
2004-02-04 21:52:57 +00:00
Alan Cox
6caf7e9fa4 Synchronize access to a vm page's valid field using the containing
vm object's lock.
2003-10-04 23:37:38 +00:00
Jeff Roberson
8b5905a47d - Remove the backtrace() call from the *_vinvalbuf() functions. Thanks to a
stack trace supplied by phk, I now understand what's going on here.  The
   check for VI_XLOCK stops us from calling vinvalbuf once the vnode has been
   partially torn down in vclean().  It is not clear that this would cause
   a problem.  Document this in nfs_bio.c, which is where the other two
   filesystems copied this code from.
2003-10-04 08:51:50 +00:00
Jeff Roberson
ce1fb23146 - Remove interlock protection around VI_XLOCK. The interlock is not
sufficient to guarantee that this race is not hit.  The XLOCK will likely
   have to be redesigned due to the way reference counting and mutexes work
   in FreeBSD.  We currently can not be guaranteed that xlock was not set
   and cleared while we were blocked on the interlock while waiting to check
   for XLOCK.  This would lead us to reference a vnode which was not the
   vnode we requested.
 - Add a backtrace() call inside of INVARIANTS in the hopes of finding out if
   this condition is ever hit.  It should not, since we should be retaining
   a reference to the vnode in these cases.  The reference would be sufficient
   to block recycling.
2003-09-19 23:37:49 +00:00
Poul-Henning Kamp
a8d43c90af Add a "int fd" argument to VOP_OPEN() which in the future will
contain the filedescriptor number on opens from userland.

The index is used rather than a "struct file *" since it conveys a bit
more information, which may be useful to in particular fdescfs and /dev/fd/*

For now pass -1 all over the place.
2003-07-26 07:32:23 +00:00
Alan Cox
82b8b18959 Lock the vm object when freeing a vm page. 2003-06-19 03:38:05 +00:00
Jeff Roberson
120d1b9e32 - smb_td_intr takes a thread as an argument not a proc. 2003-04-01 09:24:12 +00:00
Jeff Roberson
6f39c1a1fe - smb_proc_intr is now spelled smb_td_intr.
Noticed by:	phk
Pointy hat to:	jeffr
2003-04-01 09:23:24 +00:00
Dag-Erling Smørgrav
521f364b80 More low-hanging fruit: kill caddr_t in calls to wakeup(9) / [mt]sleep(9). 2003-03-02 16:54:40 +00:00
Dag-Erling Smørgrav
8994a245e0 Clean up whitespace, s/register //, refrain from strong urge to ANSIfy. 2003-03-02 15:56:49 +00:00
Dag-Erling Smørgrav
c952458814 uiomove-related caddr_t -> void * (just the low-hanging fruit) 2003-03-02 15:50:23 +00:00
Tim J. Robbins
11de0c59e9 Store a reference to the parent directory's vnode in struct smbnode,
not to the parent's smbnode, which may be freed during the lifetime
of the child if the mount is forcibly unmounted. umount -f should now
work properly (ie. not panic) on smbfs mounts.
2002-12-13 10:15:01 +00:00
Kirk McKusick
a5b65058d5 Regularize the vop_stdlock'ing protocol across all the filesystems
that use it. Specifically, vop_stdlock uses the lock pointed to by
vp->v_vnlock. By default, getnewvnode sets up vp->v_vnlock to
reference vp->v_lock. Filesystems that wish to use the default
do not need to allocate a lock at the front of their node structure
(as some still did) or do a lockinit. They can simply start using
vn_lock/VOP_UNLOCK. Filesystems that wish to manage their own locks,
but still use the vop_stdlock functions (such as nullfs) can simply
replace vp->v_vnlock with a pointer to the lock that they wish to
have used for the vnode. Such filesystems are responsible for
setting the vp->v_vnlock back to the default in their vop_reclaim
routine (e.g., vp->v_vnlock = &vp->v_lock).

In theory, this set of changes cleans up the existing filesystem
lock interface and should have no function change to the existing
locking scheme.

Sponsored by:	DARPA & NAI Labs.
2002-10-14 03:20:36 +00:00
Jeff Roberson
e6e370a7fe - Replace v_flag with v_iflag and v_vflag
- v_vflag is protected by the vnode lock and is used when synchronization
   with VOP calls is needed.
 - v_iflag is protected by interlock and is used for dealing with vnode
   management issues.  These flags include X/O LOCK, FREE, DOOMED, etc.
 - All accesses to v_iflag and v_vflag have either been locked or marked with
   mp_fixme's.
 - Many ASSERT_VOP_LOCKED calls have been added where the locking was not
   clear.
 - Many functions in vfs_subr.c were restructured to provide for stronger
   locking.

Idea stolen from:	BSD/OS
2002-08-04 10:29:36 +00:00
Alan Cox
1e7ce68ff4 o Lock page queue accesses in nwfs and smbfs.
o Assert that the page queues lock is held in vm_page_deactivate().
2002-08-02 05:23:58 +00:00
Boris Popov
b88157559d UIO_NOCOPY is not supported for now, so refuse read opeartion if this flag
is set. The full emulation of bio are on its way...
2002-04-26 03:49:02 +00:00
Boris Popov
959b83b921 Track nfs's getpages() changes:
Properly count v_vnodepgsin.
    Do not reread page if is already valid.
    Properly handle partially filled pages.
2002-04-23 14:30:43 +00:00
Boris Popov
3f36e6f21a Get rid from extra #ifdefs. 2002-04-23 13:55:14 +00:00
John Baldwin
a854ed9893 Simple p_ucred -> td_ucred changes to start using the per-thread ucred
reference.
2002-02-27 18:32:23 +00:00
Boris Popov
b1c996c40b Catch up with KSE changes.
Submitted by:	Max Khon <fjoe@iclub.nsu.ru>
2001-12-02 08:56:58 +00:00
John Baldwin
7063595315 Grab the process lock around psignal().
Noticed by:	tanimura
2001-07-18 19:17:36 +00:00
John Baldwin
4a370459cc - Update the vmmeter statistics for vnode pageins and pageouts in
getpages/putpages.
- Use vm_page_undirty() instead of messing with pages' dirty fields
  directly.
2001-07-04 19:55:01 +00:00
Peter Wemm
f41325db5f With this commit, I hereby pronounce gensetdefs past its use-by date.
Replace the a.out emulation of 'struct linker_set' with something
a little more flexible.  <sys/linker_set.h> now provides macros for
accessing elements and completely hides the implementation.

The linker_set.h macros have been on the back burner in various
forms since 1998 and has ideas and code from Mike Smith (SET_FOREACH()),
John Polstra (ELF clue) and myself (cleaned up API and the conversion
of the rest of the kernel to use it).

The macros declare a strongly typed set.  They return elements with the
type that you declare the set with, rather than a generic void *.

For ELF, we use the magic ld symbols (__start_<setname> and
__stop_<setname>).  Thanks to Richard Henderson <rth@redhat.com> for the
trick about how to force ld to provide them for kld's.

For a.out, we use the old linker_set struct.

NOTE: the item lists are no longer null terminated.  This is why
the code impact is high in certain areas.

The runtime linker has a new method to find the linker set
boundaries depending on which backend format is in use.

linker sets are still module/kld unfriendly and should never be used
for anything that may be modular one day.

Reviewed by:	eivind
2001-06-13 10:58:39 +00:00
Boris Popov
d759827bd9 Convert vnode_pager_freepage() to vm_free_page().
Forgotten by:	alfred
2001-05-03 09:00:54 +00:00
Poul-Henning Kamp
a62615e59b Implement vop_std{get|put}pages() and add them to the default vop[].
Un-copy&paste all the VOP_{GET|PUT}PAGES() functions which do nothing but
the default.
2001-05-01 08:34:45 +00:00
Boris Popov
681a5bbef2 Import kernel part of SMB/CIFS requester.
Add smbfs(CIFS) filesystem.

Userland part will be in the ports tree for a while.

Obtained from:	smbfs-1.3.7-dev package.
2001-04-10 07:59:06 +00:00