ref: 128ea44a89c7905612ad2fa5a61a9325ddfb5e1e
dir: /sys/src/cmd/cwfs/doc/changes/
changes to Ken's file server to make this 63-bit file server Geoff Collyer July—October 2004 note: 2⁶³=9,223,372,036,854,775,808 or 8EB (9.2×10¹⁸) • 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 (5.42×10¹¹). 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 2⁶³ 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