Commit Graph

69 Commits

Author SHA1 Message Date
Mohan Srinivasan
7d7d9e2242 Fixes up the handling of shared vnode lock lookups in the NFS client,
adds a FS type specific flag indicating that the FS supports shared
vnode lock lookups, adds some logic in vfs_lookup.c to test this flag
and set lock flags appropriately.

- amd on 6.x is a non-starter (without this change). Using amd under
  heavy load results in a deadlock (with cascading vnode locks all the
  way to the root) very quickly.
- This change should also fix the more general problem of cascading
  vnode deadlocks when an NFS server goes down.

Ideally, we wouldn't need these changes, as enabling shared vnode lock
lookups globally would work. Unfortunately, UFS, for example isn't
ready for shared vnode lock lookups, crashing pretty quickly.

This change is the result of discussions with Stephan Uphoff (ups@).

Reviewed by:	ups@
2006-09-13 18:39:09 +00:00
Konstantin Belousov
a881fd5a0a Always supply curthread as argument to nfs_asyncio and nfs_doio
in nfs_strategy. Otherwise, for some buffers, signals would be ignored
at the intr mounts.

Reviewed by:	mohan, cel
MFC after:	1 month
Approved by:	pjd (mentor)
2006-07-12 09:16:35 +00:00
Chuck Lever
52bde90e30 While reviewing NFS client for another PR, noticed this omission in the
NFSv4 client READDIR logic.  This change matches the logic in the version
2 and 3 code.

Sponsored by:	Network Appliance, Incorporated
2006-05-24 15:56:36 +00:00
Chuck Lever
6d0699a5ba NFS over TCP retransmit behavior should default to a 60 second time out,
mimicing the NFS reference implementation.

NFS over TCP does not need fast retransmit timeouts, since network loss
and congestion are managed by the transport (TCP), unlike with NFS over
UDP.  A long timeout prevents the unnecessary retransmission of non-
idempotent NFS requests.

Reviewed by:	mohans, silby, rees?
Sponsored by:	Network Appliance, Incorporated
2006-05-23 18:48:07 +00:00
Mohan Srinivasan
f1cdf89911 Changes to make the NFS client MP safe.
Thanks to Kris Kennaway for testing and sending lots of bugs my way.
2006-05-19 00:04:24 +00:00
Chuck Lever
5f396e80f0 Add better sanity checking to the logic that handles ioctl processing
for nfsclient and nfs4client in order to prevent local root users
from panicing the system.

PR:		kern/77463
Submitted by:	Wojciech A. Koszek
Reviewed by:	cel, rees
MFC after:	2 weeks
Security:	Local root users can panic the system at will
2006-05-13 00:16:35 +00:00
Jim Rees
c1f097baba Use nfs4_disconnect for connections opened with nfs4_connect.
Submitted by:	cel@citi.umich.edu
MFC after:	1 week
2006-01-19 22:48:31 +00:00
Tor Egge
82be0a5a24 Add marker vnodes to ensure that all vnodes associated with the mount point are
iterated over when using MNT_VNODE_FOREACH.

Reviewed by:	truckman
2006-01-09 20:42:19 +00:00
Tor Egge
012cbd3181 Obtain mount point lock before restarting sync loop if vget() failed.
Reviewed by:	truckman
2006-01-09 18:57:35 +00:00
Robert Watson
5bb84bc84b Normalize a significant number of kernel malloc type names:
- Prefer '_' to ' ', as it results in more easily parsed results in
  memory monitoring tools such as vmstat.

- Remove punctuation that is incompatible with using memory type names
  as file names, such as '/' characters.

- Disambiguate some collisions by adding subsystem prefixes to some
  memory types.

- Generally prefer lower case to upper case.

- If the same type is defined in multiple architecture directories,
  attempt to use the same name in additional cases.

Not all instances were caught in this change, so more work is required to
finish this conversion.  Similar changes are required for UMA zone names.
2005-10-31 15:41:29 +00:00
Jeff Roberson
3b06a01534 - We want if (mrep != NULL) not if (m_freem != NULL). m_freem will never
be NULL and we will always leak mrep in the error case.

Submitted by:	 Greg Taleck <gtaleck@isilon.com>
2005-04-25 05:11:19 +00:00
Jeff Roberson
5b5f16b5a8 - cache_lookup() relocks the parent in the DOTDOT case for us.
Spotted by:	phk
Sponsored by:	Isilon Systems, Inc.
2005-04-14 07:08:34 +00:00
Jeff Roberson
4585e3ac5a - Change all filesystems and vfs_cache to relock the dvp once the child is
locked in the ISDOTDOT case.  Se vfs_lookup.c r1.79 for details.

Sponsored by:	Isilon Systems, Inc.
2005-04-13 10:59:09 +00:00
Jeff Roberson
da1c9cb2b5 - Remove wantparent, it is no longer necessary. An assert in vfs_lookup.c
prevents any callers from doing a modifying op without
   LOCKPARENT or WANTPARENT.
2005-03-29 13:09:42 +00:00
Jeff Roberson
5c5e51fd9a - cache_lookup() now locks the new vnode for us to prevent some races.
Remove redundant code.

Sponsored by:	Isilon Systems, Inc.
2005-03-29 13:00:37 +00:00
Jeff Roberson
f6576f194e - We no longer have to bother with PDIRUNLOCK, lookup() handles it for us.
- Network filesystems are written with a special idiom that checks the
   cache first, and may even unlock dvp before discovering that a network
   round-trip is required to resolve the name.  I believe dvp is prevented
   from being recycled even in the forced unmount case by the shared lock
   on the mount point.  If not, this code should grow checks for VI_DOOMED
   after it relocks dvp or it will access NULL v_data fields.

Sponsored by:	Isilon Systems, Inc.
2005-03-28 09:29:58 +00:00
Jeff Roberson
a176ceb322 - Update vfs_root implementations to match the new prototype. None of
these filesystems will support shared locks until they are explicitly
   modified to do so.  Careful review must be done to ensure that this
   is safe for each individual filesystem.

Sponsored by:   Isilon Systems, Inc.
2005-03-24 07:39:03 +00:00
David Schultz
ab3ac78792 Remove dead code.
Found by:	Coverity Prevent analysis tool
2005-03-18 22:33:10 +00:00
Jeff Roberson
dcc18814ba - It is no longer necessary to lock and unlock the vnode in nfs4_close()
as the top level does this for us now.

Sponsored by:	Isilon Systems, Inc.
2005-03-13 12:16:45 +00:00
Poul-Henning Kamp
44b3f4ab59 Follow v_id changes in NFSv[23] 2005-02-22 15:15:28 +00:00
Poul-Henning Kamp
56dd36b1a6 Remove unused cred arg from nfs_vinvalbuf() and many bogus arguments
passed for it.
2005-01-24 12:31:06 +00:00
Poul-Henning Kamp
14bcbf608e This file fell out of the list when adding bufsync. 2005-01-11 11:36:26 +00:00
Poul-Henning Kamp
8df6bac4c7 Remove the unused credential argument from VOP_FSYNC() and VFS_SYNC().
I'm not sure why a credential was added to these in the first place, it is
not used anywhere and it doesn't make much sense:

	The credentials for syncing a file (ability to write to the
	file) should be checked at the system call level.

	Credentials for syncing one or more filesystems ("none")
	should be checked at the system call level as well.

	If the filesystem implementation needs a particular credential
	to carry out the syncing it would logically have to the
	cached mount credential, or a credential cached along with
	any delayed write data.

Discussed with:	rwatson
2005-01-11 07:36:22 +00:00
Warner Losh
c398230b64 /* -> /*- for license, minor formatting changes 2005-01-07 01:45:51 +00:00
Paul Saab
35ec46b7f2 Rewrite of the NFS client's reply handling. We now have NFS socket
upcalls which do RPC header parsing and match up the reply with the
request. NFS calls now sleep on the nfsreq structure. This enables
us to eliminate the NFS recvlock.

Submitted by:	Mohan Srinivasan mohans at yahoo-inc dot com
2004-12-06 21:11:15 +00:00
Poul-Henning Kamp
ea87d2a2d4 Convert to nmount, add omount compat.
Take the cheap way and just put struct nfs_args in a nmount arg, we will
need a userland mount_nfs4(8) program anyhow.
2004-12-06 20:33:24 +00:00
Paul Saab
ddc6c40075 2 fixes that improve on the consistency of the NFS client cache.
- Change the cached mtime to a 'struct timespec' from a
  time_t. Improving the precision of the cached mtime tightens up
  NFS' "close-to-open" consistency considerably.
- Always force an over-the-wire consistency check from nfs_open()
  (unless the file is marked modified). This further improves
  NFS' "close-to-open" consistency.

Submitted by:	Mohan Srinivasan mohans at yahoo-inc dot com
2004-12-06 19:18:00 +00:00
Poul-Henning Kamp
743312367a VFS_STATFS(mp, ...) is mostly called with &mp->mnt_stat, but a few cases
doesn't.  Most of the implementations have grown weeds for this so they
copy some fields from mnt_stat if the passed argument isn't that.

Fix this the cleaner way:  Always call the implementation on mnt_stat
and copy that in toto to the VFS_STATFS argument if different.
2004-12-05 22:41:02 +00:00
Poul-Henning Kamp
aec0fb7b40 Back when VOP_* was introduced, we did not have new-style struct
initializations but we did have lofty goals and big ideals.

Adjust to more contemporary circumstances and gain type checking.

	Replace the entire vop_t frobbing thing with properly typed
	structures.  The only casualty is that we can not add a new
	VOP_ method with a loadable module.  History has not given
	us reason to belive this would ever be feasible in the the
	first place.

	Eliminate in toto VOCALL(), vop_t, VNODEOP_SET() etc.

	Give coda correct prototypes and function definitions for
	all vop_()s.

	Generate a bit more data from the vnode_if.src file:  a
	struct vop_vector and protype typedefs for all vop methods.

	Add a new vop_bypass() and make vop_default be a pointer
	to another struct vop_vector.

	Remove a lot of vfs_init since vop_vector is ready to use
	from the compiler.

	Cast various vop_mumble() to void * with uppercase name,
	for instance VOP_PANIC, VOP_NULL etc.

	Implement VCALL() by making vdesc_offset the offsetof() the
	relevant function pointer in vop_vector.  This is disgusting
	but since the code is generated by a script comparatively
	safe.  The alternative for nullfs etc. would be much worse.

	Fix up all vnode method vectors to remove casts so they
	become typesafe.  (The bulk of this is generated by scripts)
2004-12-01 23:16:38 +00:00
Jim Rees
088c777637 don't confuse NFSMNT_ flags with MNT_ flags in statfs
Approved by:	alfred
2004-12-01 21:47:51 +00:00
Poul-Henning Kamp
a4e16be2b4 Remove redundant functions (repo-copied from nfsclient) for dealing with
fifos.
2004-12-01 20:18:56 +00:00
Poul-Henning Kamp
ccae7d65f7 Scripted modification of vop_* prototypes to use typedefs. 2004-12-01 19:08:40 +00:00
Jim Rees
02a8ac2b7b Fix for a bug in nfs_mkdir() that called vrele() instead of vput()
in the error cases, causing panics.

Adapted from similar fix to NFSv3 mkdir submitted by Mohan Srinivasan mohans
at yahoo-inc dot com

Approved by:	alfred
2004-12-01 17:58:37 +00:00
Poul-Henning Kamp
64042a76b6 Refuse attempts to mount root filesystem 2004-11-09 22:21:10 +00:00
Alfred Perlstein
4ebbd9b988 comment out debug printf.
Submitted by: rees
2004-10-27 23:19:34 +00:00
Poul-Henning Kamp
882e79f620 Remove blank line which crept in. 2004-10-26 20:11:27 +00:00
Poul-Henning Kamp
156cb26583 Loose the v_dirty* and v_clean* alias macros.
Check the count field where we just want to know the full/empty state,
rather than using TAILQ_EMPTY() or TAILQ_FIRST().
2004-10-25 09:14:03 +00:00
Poul-Henning Kamp
b792bebeea Move the buffer method vector (buf->b_op) to the bufobj.
Extend it with a strategy method.

Add bufstrategy() which do the usual VOP_SPECSTRATEGY/VOP_STRATEGY
song and dance.

Rename ibwrite to bufwrite().

Move the two NFS buf_ops to more sensible places, add bufstrategy
to them.

Add inlines for bwrite() and bstrategy() which calls through
buf->b_bufobj->b_ops->b_{write,strategy}().

Replace almost all VOP_STRATEGY()/VOP_SPECSTRATEGY() calls with bstrategy().
2004-10-24 20:03:41 +00:00
Poul-Henning Kamp
494eb176e7 Add b_bufobj to struct buf which eventually will eliminate the need for b_vp.
Initialize b_bufobj for all buffers.

Make incore() and gbincore() take a bufobj instead of a vnode.

Make inmem() local to vfs_bio.c

Change a lot of VI_[UN]LOCK(bp->b_vp) to BO_[UN]LOCK(bp->b_bufobj)
also VI_MTX() to BO_MTX(),

Make buf_vlist_add() take a bufobj instead of a vnode.

Eliminate other uses of bp->b_vp where bp->b_bufobj will do.

Various minor polishing: remove "register", turn panic into KASSERT,
use new function declarations, TAILQ_FOREACH_SAFE() etc.
2004-10-22 08:47:20 +00:00
Poul-Henning Kamp
a76d8f4ec9 Move the VI_BWAIT flag into no bo_flag element of bufobj and call it BO_WWAIT
Add bufobj_wref(), bufobj_wdrop() and bufobj_wwait() to handle the write
count on a bufobj.  Bufobj_wdrop() replaces vwakeup().

Use these functions all relevant places except in ffs_softdep.c where
the use if interlocked_sleep() makes this impossible.

Rename b_vnbufs to b_bobufs now that we touch all the relevant files anyway.
2004-10-21 15:53:54 +00:00
Poul-Henning Kamp
52c55a26b1 Remove NFS4 vop method vector for devices: we are desupporing device nodes
on anything but DEVFS and in this case it was not even used (see below).

Put the NFS4 vop method for fifo's behind "#if 0" because it is unused.
Add a XXX comment to say that I think the unusedness is a bug.
2004-09-27 20:02:50 +00:00
Poul-Henning Kamp
08dbd671ff Remove unused B_WRITEINPROG flag 2004-09-15 21:49:22 +00:00
Poul-Henning Kamp
35f134080f Explicitly pass vnode to nfs_doio() and mountpoint to nfs_asyncio(). 2004-09-07 08:56:43 +00:00
Poul-Henning Kamp
5e8c582ac2 Put a version element in the VFS filesystem configuration structure
and refuse initializing filesystems with a wrong version.  This will
aid maintenance activites on the 5-stable branch.

s/vfs_mount/vfs_omount/

s/vfs_nmount/vfs_mount/

Name our filesystems mount function consistently.

Eliminate the namiedata argument to both vfs_mount and vfs_omount.
It was originally there to save stack space.  A few places abused
it to get hold of some credentials to pass around.  Effectively
it is unused.

Reorganize the root filesystem selection code.
2004-07-30 22:08:52 +00:00
Alexander Kabaev
445e045b0d Avoid casts as lvalues. 2004-07-28 06:59:55 +00:00
Poul-Henning Kamp
cf95b5c381 Eliminate unused second argument to reassignbuf() and simplify it
accordingly.
2004-07-25 21:24:23 +00:00
Alfred Perlstein
f257b7a54b Make VFS_ROOT() and vflush() take a thread argument.
This is to allow filesystems to decide based on the passed thread
which vnode to return.
Several filesystems used curthread, they now use the passed thread.
2004-07-12 08:14:09 +00:00
Brian Somers
0ac4013324 Change the following environment variables to kernel options:
bootp -> BOOTP
    bootp.nfsroot -> BOOTP_NFSROOT
    bootp.nfsv3 -> BOOTP_NFSV3
    bootp.compat -> BOOTP_COMPAT
    bootp.wired_to -> BOOTP_WIRED_TO

- i.e. back out the previous commit.  It's already possible to
pxeboot(8) with a GENERIC kernel.

Pointed out by: dwmalone
2004-07-08 22:35:36 +00:00
Brian Somers
59e1ebc9b5 Change the following kernel options to environment variables:
BOOTP -> bootp
    BOOTP_NFSROOT -> bootp.nfsroot
    BOOTP_NFSV3 -> bootp.nfsv3
    BOOTP_COMPAT -> bootp.compat
    BOOTP_WIRED_TO -> bootp.wired_to

This lets you PXE boot with a GENERIC kernel by putting this sort of thing
in loader.conf:

    bootp="YES"
    bootp.nfsroot="YES"
    bootp.nfsv3="YES"
    bootp.wired_to="bge1"

or even setting the variables manually from the OK prompt.
2004-07-08 13:40:33 +00:00
Poul-Henning Kamp
e3c5a7a4dd When we traverse the vnodes on a mountpoint we need to look out for
our cached 'next vnode' being removed from this mountpoint.  If we
find that it was recycled, we restart our traversal from the start
of the list.

Code to do that is in all local disk filesystems (and a few other
places) and looks roughly like this:

		MNT_ILOCK(mp);
	loop:
		for (vp = TAILQ_FIRST(&mp...);
		    (vp = nvp) != NULL;
		    nvp = TAILQ_NEXT(vp,...)) {
			if (vp->v_mount != mp)
				goto loop;
			MNT_IUNLOCK(mp);
			...
			MNT_ILOCK(mp);
		}
		MNT_IUNLOCK(mp);

The code which takes vnodes off a mountpoint looks like this:

	MNT_ILOCK(vp->v_mount);
	...
	TAILQ_REMOVE(&vp->v_mount->mnt_nvnodelist, vp, v_nmntvnodes);
	...
	MNT_IUNLOCK(vp->v_mount);
	...
	vp->v_mount = something;

(Take a moment and try to spot the locking error before you read on.)

On a SMP system, one CPU could have removed nvp from our mountlist
but not yet gotten to assign a new value to vp->v_mount while another
CPU simultaneously get to the top of the traversal loop where it
finds that (vp->v_mount != mp) is not true despite the fact that
the vnode has indeed been removed from our mountpoint.

Fix:

Introduce the macro MNT_VNODE_FOREACH() to traverse the list of
vnodes on a mountpoint while taking into account that vnodes may
be removed from the list as we go.  This saves approx 65 lines of
duplicated code.

Split the insmntque() which potentially moves a vnode from one mount
point to another into delmntque() and insmntque() which does just
what the names say.

Fix delmntque() to set vp->v_mount to NULL while holding the
mountpoint lock.
2004-07-04 08:52:35 +00:00