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Plan 9 from Bell Labs 2008-04-24

David du Colombier 13 years ago
parent
commit
61ffdb7b17

+ 7 - 1
dist/replica/_plan9.db

@@ -5852,7 +5852,7 @@ sys/games - 20000000775 sys sys 1117225532 0
 sys/games/lib - 20000000775 sys sys 1165337608 0
 sys/games/lib/4scores - 10000000666 sys sys 1118680448 0
 sys/games/lib/5scores - 10000000666 sys sys 1118680453 0
-sys/games/lib/fortunes - 664 sys sys 1207370998 268981
+sys/games/lib/fortunes - 664 sys sys 1208978371 269327
 sys/games/lib/mahjongg - 20000000775 sys sys 1095792278 0
 sys/games/lib/mahjongg/backgrounds - 20000000775 sys sys 1095792293 0
 sys/games/lib/mahjongg/backgrounds/default.bit - 664 sys sys 1095792293 346803
@@ -14441,6 +14441,12 @@ sys/src/cmd/venti/srv/xml.h - 664 sys sys 1142736357 450
 sys/src/cmd/venti/srv/zblock.c - 664 sys sys 1178160305 1659
 sys/src/cmd/venti/srv/zeropart.c - 664 sys sys 1178160305 707
 sys/src/cmd/venti/sync.c - 664 sys sys 1177189440 726
+sys/src/cmd/venti/words - 20000000775 sys sys 1208985205 0
+sys/src/cmd/venti/words/backup.example - 775 sys sys 1045503662 521
+sys/src/cmd/venti/words/dumpvacroots - 775 sys sys 1163468045 571
+sys/src/cmd/venti/words/notes - 664 sys sys 1068500911 4032
+sys/src/cmd/venti/words/venti.conf - 664 sys sys 1019867537 397
+sys/src/cmd/venti/words/wrtape - 775 sys sys 1019678881 555
 sys/src/cmd/venti/write.c - 664 sys sys 1177189440 1106
 sys/src/cmd/vi - 20000000775 sys sys 1039727599 0
 sys/src/cmd/vi/bpt.c - 664 sys sys 944961341 2216

+ 7 - 1
dist/replica/plan9.db

@@ -5852,7 +5852,7 @@ sys/games - 20000000775 sys sys 1117225532 0
 sys/games/lib - 20000000775 sys sys 1165337608 0
 sys/games/lib/4scores - 10000000666 sys sys 1118680448 0
 sys/games/lib/5scores - 10000000666 sys sys 1118680453 0
-sys/games/lib/fortunes - 664 sys sys 1207370998 268981
+sys/games/lib/fortunes - 664 sys sys 1208978371 269327
 sys/games/lib/mahjongg - 20000000775 sys sys 1095792278 0
 sys/games/lib/mahjongg/backgrounds - 20000000775 sys sys 1095792293 0
 sys/games/lib/mahjongg/backgrounds/default.bit - 664 sys sys 1095792293 346803
@@ -14441,6 +14441,12 @@ sys/src/cmd/venti/srv/xml.h - 664 sys sys 1142736357 450
 sys/src/cmd/venti/srv/zblock.c - 664 sys sys 1178160305 1659
 sys/src/cmd/venti/srv/zeropart.c - 664 sys sys 1178160305 707
 sys/src/cmd/venti/sync.c - 664 sys sys 1177189440 726
+sys/src/cmd/venti/words - 20000000775 sys sys 1208985205 0
+sys/src/cmd/venti/words/backup.example - 775 sys sys 1045503662 521
+sys/src/cmd/venti/words/dumpvacroots - 775 sys sys 1163468045 571
+sys/src/cmd/venti/words/notes - 664 sys sys 1068500911 4032
+sys/src/cmd/venti/words/venti.conf - 664 sys sys 1019867537 397
+sys/src/cmd/venti/words/wrtape - 775 sys sys 1019678881 555
 sys/src/cmd/venti/write.c - 664 sys sys 1177189440 1106
 sys/src/cmd/vi - 20000000775 sys sys 1039727599 0
 sys/src/cmd/vi/bpt.c - 664 sys sys 944961341 2216

+ 7 - 0
dist/replica/plan9.log

@@ -19031,3 +19031,10 @@
 1208662204 0 c 386/bin/cdfs - 775 sys sys 1208662151 173247
 1208725204 0 c sys/man/2/auth - 664 sys sys 1208725235 7535
 1208881804 0 c sys/src/mkfile.proto - 664 sys sys 1208881081 266
+1208979003 0 c sys/games/lib/fortunes - 664 sys sys 1208978371 269327
+1208986205 0 a sys/src/cmd/venti/words - 20000000775 sys sys 1208985205 0
+1208986205 1 a sys/src/cmd/venti/words/backup.example - 775 sys sys 1045503662 521
+1208986205 2 a sys/src/cmd/venti/words/dumpvacroots - 775 sys sys 1163468045 571
+1208986205 3 a sys/src/cmd/venti/words/notes - 664 sys sys 1068500911 4032
+1208986205 4 a sys/src/cmd/venti/words/venti.conf - 664 sys sys 1019867537 397
+1208986205 5 a sys/src/cmd/venti/words/wrtape - 775 sys sys 1019678881 555

+ 3 - 0
sys/games/lib/fortunes

@@ -192,6 +192,7 @@ As goatherd learns his trade by goat, so writer learns his trade by wrote.
 As of Tuesday, C will be flushed in favor of COBOL. Please update all programs.
 Assassination is the extreme form of censorship.
 At the feast of souls failure is always the guest of honor.
+Atomic compare and exchange.  These sequences are not actually atomic [⋯].  However, they are very close to atomic, [⋯] LinuxThreads has been using these sequences for many years.
 Attend winter sheep meetings. Learning never ends!
 Auribus teneo lupum.
 Automating a mess yields an automated mess. -Michael Hammer
@@ -4219,3 +4220,5 @@ Perfection is achieved, not when there is nothing more to add, but when there is
   bucket = Buckets + pe; /* bucket = &(Buckets[pe]); */
 Those who can do, those who can't write and those who can't write make ezines. - Sape
 Command (m for help): 
+`the dreaded Wordstar, the Wordprocessor that Time joined the Foreign Legion to Forget.' - Verity Stob
+Please contact nicfae@realtek.com.tw for singing NDA form.

+ 26 - 0
sys/src/cmd/venti/words/backup.example

@@ -0,0 +1,26 @@
+#!/bin/rc
+
+rfork e
+cd /usr/rsc
+. bkup.info
+fn x {
+	echo x $*
+	y=$1
+	if(~ $#$y 0){
+		$y=0
+	}
+	echo venti/wrarena -o $2 $3 $$y
+	end=`{venti/wrarena -o $2 $3 $$y | grep '^end offset ' | sed 's/^end offset //'}
+	if(~ $#end 1 && ! ~ $$y $end){
+		$y=$end
+		echo '#' `{date} >>bkup.info
+		whatis $y >>bkup.info
+	}
+}
+hget http://127.1:8000/index | 
+awk '
+/^index=/ { blockSize=0+substr($3, 11); }
+/^arena=/ { arena=substr($1, 7); }
+/^	arena=/ { start=0+substr($5, 2)-blockSize; printf("x %s %d %s\n", arena, start, $3); }
+' |rc
+

+ 19 - 0
sys/src/cmd/venti/words/dumpvacroots

@@ -0,0 +1,19 @@
+#!/bin/rc
+# dumpvacroots - dumps all the vac scores ever stored to the venti server
+# if nothing else, this illustrates that you have to control access
+# to the physical disks storing the archive!
+
+ventihttp=`{echo $venti | sed 's/^[a-z]+!([0-9\.]+)![a-z0-9]+$/\1/
+		s/^[a-z]+!([0-9\.]+)/\1/; s/$/:80/'
+}
+
+hget http://$ventihttp/index | 
+	awk '
+ /^index=/ { blockSize=0+substr($3, 11) }
+ /^arena=/ { arena=substr($1, 7) }
+ /^	arena=/ {
+		start = (0+substr($5, 2))-blockSize
+		printf("venti/printarena -o %.0f %s\n", start, $3 "")
+}' |
+	rc |
+	sed -n 's/^(.*) 1$/vac:\1/p'

+ 149 - 0
sys/src/cmd/venti/words/notes

@@ -0,0 +1,149 @@
+all data is big-endian on disk.
+
+arena layout:
+
+ArenaPart (first at offset PartBlank = 256kB in the disk file)
+	magic[4] 0xA9E4A5E7
+	version[4] 3
+	blockSize[4]
+	arenaBase[4] offset of first ArenaHead structure in the disk file
+
+the ArenaMap starts at the first block at offset >= PartBlank+512 bytes.
+it is a sequence of text lines
+/*
+ * amap: n '\n' amapelem * n
+ * n: u32int
+ * amapelem: name '\t' astart '\t' asize '\n'
+ * astart, asize: u64int
+ */
+
+the astart and astop are byte offsets in the disk file.
+they are the offsets to the ArenaHead and the end of the Arena block.
+
+ArenaHead 
+[base points here in the C code]
+size bytes
+	Clumps
+	ClumpInfo blocks
+Arena
+
+Arena
+	magic[4] 0xF2A14EAD
+	version[4] 4
+	name[64]
+	clumps[4]
+	cclumps[4]
+	ctime[4]
+	wtime[4]
+	used[8]
+	uncsize[8]
+	sealed[1]
+	optional score[20]
+
+once sealed, the sha1 hash of every block from the
+ArenaHead to the Arena is checksummed, as though
+the final score in Arena were the zeroScore.  strangely,
+the tail of the Arena block (the last one) is not included in the checksum
+(i.e., the unused data after the score).
+
+clumpMax = blocksize/ClumpInfoSize = blocksize/25
+dirsize = ((clumps/clumpMax)+1) * blocksize
+want used+dirsize <= size
+want cclumps <= clumps
+want uncsize+clumps*ClumpSize+blocksize < used
+want ctime <= wtime
+
+clump info is stored packed into blocks in order.
+clump info moves forward through a block but the
+blocks themselves move backwards.  so if cm=clumpMax
+and there are two blocks worth of clumpinfo, the blocks
+look like;
+
+	[cm..2*cm-1] [0..cm-1] [Arena]
+
+with the blocks pushed right up against the Arena trailer.
+
+ArenaHead
+	magic[4] 0xD15C4EAD
+	version[4] = Arena.version
+	name[64]
+	blockSize[4]
+	size[8]
+
+Clump
+	magic[4] 0xD15CB10C (0 for an unused clump)
+	type[1]
+	size[2]
+	uncsize[2]
+	score[20]
+	encoding[1] raw=1, compress=2
+	creator[4]
+	time[4]
+
+ClumpInfo
+	type[1]
+	size[2]
+	uncsize[2]
+	score[20]
+
+the arenas are mapped into a single address space corresponding
+to the index that brings them together.  if each arena has 100M bytes
+excluding the headers and there are 4 arenas, then there's 400M of
+index address space between them.  index address space starts at 1M
+instead of 0, so the index addresses assigned to the first arena are
+1M up to 101M, then 101M to 201M, etc.
+
+of course, the assignment of addresses has nothing to do with the index,
+but that's what they're called.
+
+
+the index is split into index sections, which are put on different disks
+to get parallelism of disk heads.  each index section holds some number
+of hash buckets, each in its own disk block.  collectively the index sections
+hold ix->buckets between them. 
+
+the top 32-bits of the score is used to assign scores to buckets.
+div = ceil(2³² / ix->buckets) is the amount of 32-bit score space per bucket.
+
+to look up a block, take the top 32 bits of score and divide by div
+to get the bucket number.  then look through the index section headers
+to figure out which index section has that bucket.
+
+then load that block from the index section.  it's an IBucket.
+
+the IBucket has ib.n IEntry structures in it, sorted by score and then by type.
+do the lookup and get an IEntry.  the ia.addr will be a logical address
+that you then use to get the 
+
+ISect
+	magic[4] 0xD15C5EC7
+	version[4]
+	name[64]
+	index[64]
+	blockSize[4]
+	blockBase[4]	address in partition where bucket blocks start
+	blocks[4]
+	start[4]
+	stop[4]	stop - start <= blocks, but not necessarily ==
+
+IEntry
+	score[20]
+	wtime[4]
+	train[2]
+	ia.addr[8]		index address (see note above)
+	ia.size[2]		size of uncompressed block data
+	ia.type[1]
+	ia.blocks[1]	number of blocks of clump on disk
+
+IBucket
+	n[2]
+	next[4]	not sure; either 0 or inside [start,stop) for the ISect
+	data[n*IEntrySize]
+
+final piece: all the disk partitions start with PartBlank=256kB of unused disk
+(presumably to avoid problems with boot sectors and layout tables
+and the like).
+
+actually the last 8k of the 256k (that is, at offset 248kB) can hold
+a venti config file to help during bootstrap of the venti file server.
+

+ 20 - 0
sys/src/cmd/venti/words/venti.conf

@@ -0,0 +1,20 @@
+# a sample venti configuration file
+#
+# formated with
+#	venti/fmtarenas arena. /tmp/disks/arenas
+# 	venti/fmtisect isect0 /tmp/disks/isect0
+# 	venti/fmtisect isect1 /tmp/disks/isect1
+#	venti/fmtindex venti.conf
+#
+# server is started with
+#	venti/venti
+
+# the name of the index
+index main
+
+# the index sections
+isect /tmp/disks/isect0
+isect /tmp/disks/isect1
+
+# the arenas
+arenas /tmp/disks/arenas

+ 21 - 0
sys/src/cmd/venti/words/wrtape

@@ -0,0 +1,21 @@
+#!/bin/rc
+
+tape=$1
+
+start=`{echo $tape'*32+1' | hoc}
+end=`{echo  $start'+31' | hoc}
+
+echo rewind | scuzz /dev/sd03
+
+arenas=`{hget http://iolaire/index | grep '^arena' | sed  -n $start,$end^p | sed 's/^.*=//' | sed 's/ .*//'}
+for(i in $arenas) {
+	dev=`{hget http://iolaire/index | grep ''''$i'''' | sed 's/.* on //' | sed 's/ .*//'}
+	echo `{date} $tape $i
+	echo `{date} $tape $i >> /sys/log/ventibackup
+	echo $dev
+	echo write '''|venti/rdarena $dev $i''' | scuzz -m 8192 /dev/sd03
+	echo filemark | scuzz -m 6144 /dev/sd03
+}
+
+echo rewind | scuzz /dev/sd03
+