delta/nfs-utils.git, branch nfs4

mount.nfs: Use default minor version when -o v4 is specified

2017-06-13T17:24:29+00:00

When v4 is specified on the command line the
default minor version needs to be used.

Signed-off-by: Steve Dickson

mount.nfs: Use default minor version when -t nfs4 is specified

2017-06-13T16:00:39+00:00

When the nfs4 filesystem specified, the default major
and minor versions should be used.

Signed-off-by: Steve Dickson

umount.nfs: assume path name is canonical.

2017-06-13T12:39:08+00:00

/usr/bin/umount will always pass a canonical name
to umount.nfs, so it is safe to disable canonicalization.

When umounting an NFS filesystem, it is generally safest to
not "stat" the mountpoint at all as that can block
indefinitely.  umount() will not block, but lstat() etc can.
By disabling canonicalization in libmount, we discourage it
from ever calling 'stat' family operations, and thus reduce
the chance of a hang.

Note that to be fully effective, this requires changes to
util-linux which have not yet been accepted.
When both that change and this are in effect, automounters
can use "umount -c $PATH" to safely unmount a filesystem
without blocking.

Signed-off-by: NeilBrown 
Signed-off-by: Steve Dickson

nfs.conf: Removed buffer overruns

2017-06-06T14:29:24+00:00

Remove the line length parameter and associated code which
led to buffer overruns in the line parsing code.
Also drops the undocumented 'include' directive.

Signed-off-by: Justin Mitchell 
Signed-off-by: Steve Dickson

nfs.conf: Add function to cleanup and free the loaded config

2017-06-06T14:28:59+00:00

Signed-off-by: Justin Mitchell 
Signed-off-by: Steve Dickson

nfs.conf: Remove static variables in parsing routines

2017-06-06T14:28:39+00:00

Part of a sequence of attempts to tidy up the nfs.conf code and prepare
it for use as part of a configuration API.

Remove static vars that prevented memory cleanup and potentially lead to
parsing errors if conf_init was called again.

Signed-off-by: Justin Mitchell 
Signed-off-by: Steve Dickson

nfsd: added 'u' to argument list.

2017-06-01T17:29:20+00:00

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1451568
Signed-off-by: Steve Dickson

mount.nfs: improve version negotiation when vers=4 is specified.

2017-06-01T13:52:29+00:00

If NFSv4, in general, is requested (possibly by -t nfs4 or -o v4 or -o
vers=4 etc) then we need to negotiate the best minor version, but must
not fallback to v3 or v2.  Internally, this state is reflected in v_mode
== V_GENERAL.  This means that a major version was given, but the minor
version still needs to be negotiated.

This is handled by nfs_autonegotiate(). It currently does the right
thing for EPROTONOSUPPORT and EINVAL, but not for other errors.
In particular, ENOENT can cause problems as  NFSv4 might export
a different namespace than NFSv3 (e.g. by using fsid=0 in the Linux
NFS server).  Currently a mount request for NFSv4 and a particular path
can result if an NFSv3 mount if the path is available with v3 but
not v4.

So move the special handling of V_GENERAL into the common fall_back:
code, and add extra checking in the ENCONNREFUSED case, which does
not use fall_back:.

Tested-by: Steve Dickson 
Signed-off-by: NeilBrown 
Signed-off-by: Steve Dickson

mount.nfs: Restore errno after v3 mounts on ECONNREFUSED errors

2017-05-05T15:07:00+00:00

Commit 65ac59cd introduced code that tries v3 mounts
when the the v4 mount fails with ECONNREFUSED. This
code allows failing back to v3 to work correctly.

When the v3 mount fails the original errno value has
been over rewritten. In these case the errno value
needs to be restored to ECONNREFUSED.

Signed-off-by: Steve Dickson

config: Remove the conf_path global

2017-05-05T15:04:19+00:00

Working towards an nfs.conf library and API for system config tools,
first step, replace the conf_path global with a parameter to conf_init

Signed-off-by: Justin Mitchell 
Signed-off-by: Steve Dickson