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- changes to Ken's file server to make this 63-bit file server
- Geoff Collyer
- July—October 2004
- note: 2⁶=9,223,372,036,854,775,808 or 8EB (9.2×10ⁱ⁸)
- • identified longs that refer to offsets, sizes and block numbers, and
- changed them to type Off (vlong); fixed all print formats to match.
- fixed byte-swapping for the 'x' config to match.
- • fixed VLONG 9p1 message packing and unpacking macros to actually
- handle 64-bit offsets and sizes.
- • implemented triple-indirect blocks. affected code in
- dev/cw.c port/con.c port/dentry.c port/sub.c
- port/chk.c port/console.c port/portdat.h
- • Fri Aug 6 16:50:59 PDT 2004
- ; ./sizes
- Plan 9 v4 63-bit file server
- sizeof(Dentry) = 124
- sizeof(Cache) = 88
- • added long(er) file name components (56 bytes), long enough for all but one
- name in my /.longnames file (68-byte .xml name).
- • Fri Aug 6 21:43:41 PDT 2004
- ; ./sizes
- Plan 9 v4 63-bit file server sizes
- sizeof(Dentry) = 160
- sizeof(Cache) = 88
- • touched up lib.h (from libc.h) to bring it up to date with formatting
- functions, verbs & flags.
- • check now reports stack usage: 320 bytes upon entry to fsck first time,
- 92 bytes of stack per recursion. given 16000 bytes of stack,
- that's 170 recursions maximum.
- • booted xtc (terminal) from fs64 (used fs64 as main file system)
- note: current file server with triple-indirect blocks at 4k block size
- has a maximum file size of ~505GB (5.42×10ⁱⁱ).
- with quadruple-indirect blocks, max would be ~275TB @ 4k block size.
- • got igbe fs driver working (a couple small changes)
- • eliminated some gotos (started with 580, down to 454)
- • added quadruple indirect blocks: lets us reach 2⁶ with a 32kB block size
- • got igbe boot driver & pxe booting working
- • on-disk qid paths are now Offs, but 9p1 qids on the wire are still ulongs
- • generalised & parameterised indirect block implementation
- • tested with plain w0 fs, cached fake worm on w0, cw jukebox (hp 160fx)
- • ip directories in fs & fs64 are identical except for whitespace and
- goto-elimination
- • replaced most of nemo's ide code with newer ide code lifted from 9load,
- then from cpu kernel (sdata.c & support). this brings us dma, rwm & lba48,
- finds ide controllers by itself, even pci ones, & copes with dead drives
- (i.e., doesn't panic).
- • fixed long-standing bug that caused a 5-second delay before each console
- prompt on systems without a serial console.
- • further type parameterisation: Userid (short), Timet (long), Devsize (vlong).
- Comment on v7 kernel portability work, quoting scj & dmr from BSTJ v57
- #6 part 2., p. 2038: ``The important data types used within the
- system were identified and specified using typedef: disk offsets,
- absolute times, internal device names, and the like. This effort was
- carried out by K. Thompson.''
- • corrected compat.h dependencies in mkfiles
- • eliminated all warnings
- • implemented truncation via wstat
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