linux-toradex.git/fs/nfsd/Kconfig, branch v4.4.72

Merge branch 'for-4.1' of git://linux-nfs.org/~bfields/linux

2015-04-24T14:46:05+00:00

Pull nfsd updates from Bruce Fields:
 "A quiet cycle this time; this is basically entirely bugfixes.

  The few that aren't cc'd to stable are cleanup or seemed unlikely to
  affect anyone much"

* 'for-4.1' of git://linux-nfs.org/~bfields/linux:
  uapi: Remove kernel internal declaration
  nfsd: fix nsfd startup race triggering BUG_ON
  nfsd: eliminate NFSD_DEBUG
  nfsd4: fix READ permission checking
  nfsd4: disallow SEEK with special stateids
  nfsd4: disallow ALLOCATE with special stateids
  nfsd: add NFSEXP_PNFS to the exflags array
  nfsd: Remove duplicate macro define for max sec label length
  nfsd: allow setting acls with unenforceable DENYs
  nfsd: NFSD_FAULT_INJECTION depends on DEBUG_FS
  nfsd: remove unused status arg to nfsd4_cleanup_open_state
  nfsd: remove bogus setting of status in nfsd4_process_open2
  NFSD: Use correct reply size calculating function
  NFSD: Using path_equal() for checking two paths

kernel: conditionally support non-root users, groups and capabilities

2015-04-15T23:35:22+00:00

There are a lot of embedded systems that run most or all of their
functionality in init, running as root:root.  For these systems,
supporting multiple users is not necessary.

This patch adds a new symbol, CONFIG_MULTIUSER, that makes support for
non-root users, non-root groups, and capabilities optional.  It is enabled
under CONFIG_EXPERT menu.

When this symbol is not defined, UID and GID are zero in any possible case
and processes always have all capabilities.

The following syscalls are compiled out: setuid, setregid, setgid,
setreuid, setresuid, getresuid, setresgid, getresgid, setgroups,
getgroups, setfsuid, setfsgid, capget, capset.

Also, groups.c is compiled out completely.

In kernel/capability.c, capable function was moved in order to avoid
adding two ifdef blocks.

This change saves about 25 KB on a defconfig build.  The most minimal
kernels have total text sizes in the high hundreds of kB rather than
low MB.  (The 25k goes down a bit with allnoconfig, but not that much.

The kernel was booted in Qemu.  All the common functionalities work.
Adding users/groups is not possible, failing with -ENOSYS.

Bloat-o-meter output:
add/remove: 7/87 grow/shrink: 19/397 up/down: 1675/-26325 (-24650)

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Iulia Manda 
Reviewed-by: Josh Triplett 
Acked-by: Geert Uytterhoeven 
Tested-by: Paul E. McKenney 
Reviewed-by: Paul E. McKenney 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nfsd: NFSD_FAULT_INJECTION depends on DEBUG_FS

2015-03-31T20:46:39+00:00

NFSD_FAULT_INJECTION depends on DEBUG_FS, otherwise the debugfs_create_*
interface may return unexpected error -ENODEV, and cause system crash.

Signed-off-by: Chengyu Song 
Signed-off-by: J. Bruce Fields

nfsd: implement pNFS operations

2015-02-02T17:09:42+00:00

Add support for the GETDEVICEINFO, LAYOUTGET, LAYOUTCOMMIT and
LAYOUTRETURN NFSv4.1 operations, as well as backing code to manage
outstanding layouts and devices.

Layout management is very straight forward, with a nfs4_layout_stateid
structure that extends nfs4_stid to manage layout stateids as the
top-level structure.  It is linked into the nfs4_file and nfs4_client
structures like the other stateids, and contains a linked list of
layouts that hang of the stateid.  The actual layout operations are
implemented in layout drivers that are not part of this commit, but
will be added later.

The worst part of this commit is the management of the pNFS device IDs,
which suffers from a specification that is not sanely implementable due
to the fact that the device-IDs are global and not bound to an export,
and have a small enough size so that we can't store the fsid portion of
a file handle, and must never be reused.  As we still do need perform all
export authentication and validation checks on a device ID passed to
GETDEVICEINFO we are caught between a rock and a hard place.  To work
around this issue we add a new hash that maps from a 64-bit integer to a
fsid so that we can look up the export to authenticate against it,
a 32-bit integer as a generation that we can bump when changing the device,
and a currently unused 32-bit integer that could be used in the future
to handle more than a single device per export.  Entries in this hash
table are never deleted as we can't reuse the ids anyway, and would have
a severe lifetime problem anyway as Linux export structures are temporary
structures that can go away under load.

Parts of the XDR data, structures and marshaling/unmarshaling code, as
well as many concepts are derived from the old pNFS server implementation
from Andy Adamson, Benny Halevy, Dean Hildebrand, Marc Eshel, Fred Isaman,
Mike Sager, Ricardo Labiaga and many others.

Signed-off-by: Christoph Hellwig

lockd: move lockd's grace period handling into its own module

2014-09-17T20:33:11+00:00

Currently, all of the grace period handling is part of lockd. Eventually
though we'd like to be able to build v4-only servers, at which point
we'll need to put all of this elsewhere.

Move the code itself into fs/nfs_common and have it build a grace.ko
module. Then, rejigger the Kconfig options so that both nfsd and lockd
enable it automatically.

Signed-off-by: Jeff Layton

nfsd4: remove labeled NFS warning from config help

2014-08-28T20:00:07+00:00

The working group appears committed to keeping the protocol stable, the
code has gotten some use and seems to work OK.

Signed-off-by: J. Bruce Fields

nfsd: fix Kconfig syntax

2013-10-26T19:37:26+00:00

The description text for CONFIG_NFSD_V4_SECURITY_LABEL has an unpaired
quote sign which breaks syntax highlighting for the nfsd Kconfig file.
Remove it.

Signed-off-by: Christoph Hellwig 
Signed-off-by: J. Bruce Fields

NFSD: Server implementation of MAC Labeling

2013-05-15T13:27:02+00:00

Implement labeled NFS on the server: encoding and decoding, and writing
and reading, of file labels.

Enabled with CONFIG_NFSD_V4_SECURITY_LABEL.

Signed-off-by: Matthew N. Dodd 
Signed-off-by: Miguel Rodel Felipe 
Signed-off-by: Phua Eu Gene 
Signed-off-by: Khin Mi Mi Aung 
Signed-off-by: J. Bruce Fields

fs/nfsd: remove depends on CONFIG_EXPERIMENTAL

2013-01-21T22:39:05+00:00

The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
while now and is almost always enabled by default. As agreed during the
Linux kernel summit, remove it from any "depends on" lines in Kconfigs.

CC: "J. Bruce Fields" 
Cc: Al Viro 
Signed-off-by: Kees Cook 
Signed-off-by: Greg Kroah-Hartman

NFSD: Added fault injection

2011-11-08T02:10:47+00:00

Fault injection on the NFS server makes it easier to test the client's
state manager and recovery threads.  Simulating errors on the server is
easier than finding the right conditions that cause them naturally.

This patch uses debugfs to add a simple framework for fault injection to
the server.  This framework is a config option, and can be enabled
through CONFIG_NFSD_FAULT_INJECTION.  Assuming you have debugfs mounted
to /sys/debug, a set of files will be created in /sys/debug/nfsd/.
Writing to any of these files will cause the corresponding action and
write a log entry to dmesg.

Signed-off-by: Bryan Schumaker 
Signed-off-by: J. Bruce Fields