#13254: Query on E-Mail Attributes Misses Files
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Reporter: AGMS | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: File Systems/BFS | Version: R1/Development
Resolution: | Keywords: query bfs index attribute
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by axeld):
Thanks! This test shows that `MAIL:to=*` will obviously also be true if
there aren't any items:
{{{
$ find . -exec listattr {} \; | grep MAIL:to | wc -l
14230
}}}
I've started to look into it, and just in case I'm hit by a rock tomorrow:
the problem is the maximum key length. We allow for 256 bytes, and the
query's key value storage only allows for 256 bytes.
However, `TreeIterator::Traverse()` always wants to return null terminated
strings. For a 256 byte key, we'd need 257 bytes for the key plus the null
character. Since there is not enough storage, it will return
`B_BUFFER_OVERFLOW`, and the query will stop.
Not sure yet if we limit the key size to 255 bytes instead (that seems to
be what BeOS did), or just increase the query's key storage by one byte.
While the former makes us more compatible with BeOS, the latter will not
render currently existing indexes invalid. As always, opinions welcome.
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Ticket URL: <https://dev.haiku-os.org/ticket/13254#comment:3>
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