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