[Xapian-tickets] [Xapian] #651: Protect writable fds by setting filepos very high

[Xapian]

#651: Protect writable fds by setting filepos very high
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 Reporter:  Olly Betts     |             Owner:  Olly Betts
     Type:  enhancement    |            Status:  assigned
 Priority:  normal         |         Milestone:  2.0.0
Component:  Backend-Glass  |           Version:
 Severity:  normal         |        Resolution:
 Keywords:                 |        Blocked By:
 Blocking:                 |  Operating System:  All
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Comment (by Olly Betts):

 Tested NetBSD too.  An emerging pattern seems to be that on modern
 platforms we can lseek to the maximum possible `off_t` value, so trying to
 seek to that and not doing anything further seems a reasonable default
 approach.

 Linux is actually something of an oddity here in that it doesn't allow
 this for some FSes.  A notable FS which doesn't is ext4 which is widely
 used (I suspect it's still the most widely used FS on Linux) so adding a
 fallback to the ext4 value on Linux seems reasonable, and that is what
 I've already implemented.
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Ticket URL: <https://trac.xapian.org/ticket/651#comment:19>
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