* [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c @ 2003-05-22 9:24 Aharon Robbins 2003-05-23 3:32 ` Chris Palmer 0 siblings, 1 reply; 6+ messages in thread From: Aharon Robbins @ 2003-05-22 9:24 UTC (permalink / raw) Greetings all. The V7 ls(1) man page says that the -s option, which prints total blocks, includes any indirect blocks. However, the V7 struct stat didn't have the st_blocks member in the struct stat, and the code in ls.c uses long nblock(size) long size; { return((size+511)>>9); } So, is this just a case of the man page being mistaken? When did the struct stat acquire the st_blocks member? While I'm at it, the V7 ls -a option only adds . and .. to the list; apparently all other dot files were printed by default. When did ls change such that -a applied to all dot files? Thanks, Arnold Robbins ^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c 2003-05-22 9:24 [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c Aharon Robbins @ 2003-05-23 3:32 ` Chris Palmer 2003-05-23 4:02 ` M. Warner Losh 2003-05-23 4:17 ` Greg 'groggy' Lehey 0 siblings, 2 replies; 6+ messages in thread From: Chris Palmer @ 2003-05-23 3:32 UTC (permalink / raw) Aharon Robbins writes: > long > nblock(size) > long size; > { > return((size+511)>>9); > } Unfortunately I can't answer any of your questions; I can only ask a new one: What's with that "511" in there? ^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c 2003-05-23 3:32 ` Chris Palmer @ 2003-05-23 4:02 ` M. Warner Losh 2003-05-23 4:17 ` Greg 'groggy' Lehey 1 sibling, 0 replies; 6+ messages in thread From: M. Warner Losh @ 2003-05-23 4:02 UTC (permalink / raw) In message: <20030523033209.GE29449 at nodewarrior.org> Chris Palmer <chris at nodewarrior.org> writes: : Aharon Robbins writes: : : > long : > nblock(size) : > long size; : > { : > return((size+511)>>9); : > } : : Unfortunately I can't answer any of your questions; I can only ask a new : one: What's with that "511" in there? It rounds size up to the next larger block, and >> 9 divides by 512. So if you size was 512 it would return '1' but if it was 513 it would return '2'. Warner ^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c 2003-05-23 3:32 ` Chris Palmer 2003-05-23 4:02 ` M. Warner Losh @ 2003-05-23 4:17 ` Greg 'groggy' Lehey 1 sibling, 0 replies; 6+ messages in thread From: Greg 'groggy' Lehey @ 2003-05-23 4:17 UTC (permalink / raw) On Thursday, 22 May 2003 at 20:32:09 -0700, Chris Palmer wrote: > Aharon Robbins writes: > >> long >> nblock(size) >> long size; >> { >> return((size+511)>>9); >> } > > Unfortunately I can't answer any of your questions; I can only ask a new > one: What's with that "511" in there? Sector size - 1, just like the 9 is log(2) (511). It converts bytes to sectors. Greg -- Finger grog at lemis.com for PGP public key See complete headers for address and phone numbers -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 187 bytes Desc: not available URL: <http://minnie.tuhs.org/pipermail/tuhs/attachments/20030523/acb7628b/attachment.sig> ^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c
@ 2003-05-23 3:44 Michael Sokolov
0 siblings, 0 replies; 6+ messages in thread
From: Michael Sokolov @ 2003-05-23 3:44 UTC (permalink / raw)
Chris Palmer <chris at nodewarrior.org> wrote:
> What's with that "511" in there?
To divide by N rounding up you first add N-1, then divide by N.
MS
^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c @ 2003-05-25 16:22 Kirk McKusick 0 siblings, 0 replies; 6+ messages in thread From: Kirk McKusick @ 2003-05-25 16:22 UTC (permalink / raw) The st_blocks field was first added to the stat structure in 4.2BSD (4.1b really) as part of the overhaul to add the new filesystem. I added it because the variable filesystem blocksize made it difficult to compute the amount of storage dedicated to a file. Kirk McKusick ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-05-25 16:22 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2003-05-22 9:24 [TUHS] question about V7 ls(1) vs. sys/stat.h and ls.c Aharon Robbins 2003-05-23 3:32 ` Chris Palmer 2003-05-23 4:02 ` M. Warner Losh 2003-05-23 4:17 ` Greg 'groggy' Lehey 2003-05-23 3:44 Michael Sokolov 2003-05-25 16:22 Kirk McKusick
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