CVS commit: src/sys/ufs/ufs

["Emmanuel Dreyfus" <manu%netbsd.org@localhost>]

Module Name:    src
Committed By:   manu
Date:           Fri Dec 19 10:59:21 UTC 2014

Modified Files:
        src/sys/ufs/ufs: extattr.h

Log Message:
Bump UFS1 extended attribute max name length to 256

For extended attribute name max length, kernel filesystem-independant
code use either EXTATTR_MAXNAMELEN (BSD API) or XATTR_NAME_MAX (Linux API),
which are both defined as KERNEL_NAME_MAX and fits Linux limit of 255
without training \0.

UFS1 code had a lower limit that broke Linux compatibility. We can bump
the limit without sacrifying backward compatibility, because:

1) There is no API exposing this limit outside the kernel. Upper kernel
layers have a larger limit handle the increase without a hitch

2) Each attribute has its own backing store in the fileystem, the name
of the backing store matching the attribute name. A newer kernel can
create/read/write backing store for longer attribute names and will
have no problem with existing shorter names.


To generate a diff of this commit:
cvs rdiff -u -r1.10 -r1.11 src/sys/ufs/ufs/extattr.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.