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SubjectRe: File Conglomerations
Casey> So what, I hear you ask, does XFS do WRT this whole issue?
Casey> Attributes are stored as name/data pairs and are stored using
Casey> the same mechanisms as data.

Cool.

F/S:
How are file attributes laid out on the disk? Do you pick up
the attributes of all the files in a directory in one disk read? Do
you use this attribute system to store permission bits and the like?

O/S:
What is the interface to read an arbitrarily-sized attribute? Do you
use the same interface to read permission bits?

NFS:
Do you always transfer an attribute in one syscall, or do you have an
open/read/close model? How does the buffer space to store an
arbitrarily-sized attribute get allocated in user space? (The real
question here is: does it take two round trips -- one to get the
attribute size, and the next to do the read?)

-Iain

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