[PATCH 0/2] use symbolic constants in generic lseek code

[Chris Snook]

The generic lseek code in fs/read_write.c uses hardcoded values for
SEEK_{SET,CUR,END}.

Patch 1 fixes the case statements to use the symbolic constants in
include/linux/fs.h, and should not be at all controversial.

Patch 2 adds a SEEK_MAX and uses it to validate user arguments.  This makes
the code a little cleaner and also enables future extensions (such as
SEEK_DATA and SEEK_HOLE).  If anyone has a problem with this, please speak up.

-- Chris

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