net: nfs: fix file handle length in NFSv3

[Enterprise0]

cherry-pick d298656 form u-boot/u-boot to fix file handle length in NFSv3.
[1] (https://www.rfc-editor.org/rfc/rfc1813.html#page-11)
the url https://www.denx.de/wiki/U-Boot/Patches was disappear, so i can only pr here.

here is the original commit comment:

net: nfs: fix file handle length in NFSv3
The NFS protocol uses file handles to refer to file or directory.
In NFSv2 file handles have a fixed size of 32 bytes.
In NFSv3 file handles have a variable length up to 64 bytes. This is
also true for the MOUNT protocol. [1]
When the NFSv3 server replies with a file handle length > 32 bytes, U-Boot
only copies 32 bytes of that file handle and the next LOOKUP Call fails:

BIOS> nfs ${loadaddr} 192.168.1.51:/nfsroot/opos93dev-br/boot/Image
Using ethernet@428a0000 device
File transfer via NFS from server 192.168.1.51; our IP address is 192.168.1.133
Filename '/nfsroot/opos93dev-br/boot/Image'.
Load address: 0x80400000
Loading: *** ERROR: File lookup fail

done
BIOS>

Looking at this transfer in Wireshark, we can see that the server
replies with the following file handle:

length: 36
[hash (CRC-32): 0x230ac67b]
FileHandle: 0100070101005e000000000091763911f87c449fa73c298552db19ba0c9f60002980cfd2

and U-Boot sends the following file handle in the next LOOKUP Call:

length: 32
[hash (CRC-32): 0x6314131b]
FileHandle: 000000240100070101005e000000000091763911f87c449fa73c298552db19ba

Fix this by using a variable length file handle for dirfh.

[1] https://www.rfc-editor.org/rfc/rfc1813.html#page-106

Fixes: u-boot/u-boot@b0baca9 ("net: NFS: Add NFSv3 support")
Signed-off-by: Sébastien Szymanski sebastien.szymanski@armadeus.com
Tested-by: Andrew Davis afd@ti.com