Date: Thu, 23 Aug 2007 11:25:41 +0200 From: Karol Kwiatkowski <karol.kwiat@gmail.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: Chris <chrcoluk@gmail.com>, freebsd-questions@freebsd.org, Bill Moran <wmoran@potentialtech.com> Subject: Re: fsck strangeness Message-ID: <46CD5295.4050406@gmail.com> In-Reply-To: <Pine.BSF.3.96.1070823183408.26941D-100000@gaia.nimnet.asn.au> References: <Pine.BSF.3.96.1070823183408.26941D-100000@gaia.nimnet.asn.au>
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[-- Attachment #1 --] Ian Smith wrote: > On Thu, 23 Aug 2007, Karol Kwiatkowski wrote: > > Ian Smith wrote: > > > On Wed, 22 Aug 2007, Chris wrote: > > > > If its bad to run fsck on a mounted read,write then why does > > > > background fsck do it? or you talking about foreground fsck only? > > > > > > Well I was referring to foreground fsck, and I still don't know why > > > running it on a mounted fs is 'bad' when fsck runs in 'NO WRITE' mode > > > anyway when it finds a fs is mounted, hence my query above. > > > > Here's my understanding: > > > > Mounted fs (rw) isn't in stable state, there may be some writes to it - > > daemons, buffers flushes, etc. In this condition fsck can report > > inconsistency. And fsck running in 'NO WRITE' won't help anyway :) > > a) Absolutely. > > b) Indeed it usually does, fairly consistently, especially on /var. > > c) No it won't help (except where it can help locate problems in a real > mess like bad blocks), but the assertion in question was, can it hurt? Ah sorry, I missed that. With 'NO WRITE' one can suppose it shouldn't hurt anything except performance ;) I made a quick scan through the source and it looks like it won't: - in src/sbin/fsck_ffs/setup.c if fs is mounted rw fswritefd is set to -1 - in src/sbin/fsck_ffs/fsutil.c blwrite(), flush() and ckfini() won't write anything if fswritefd<0 Unless, of course, I'm missing something. Cheers, Karol -- Karol Kwiatkowski <karol.kwiat at gmail dot com> OpenPGP 0x06E09309 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iQEVAwUBRs1SnQhgT0HIecD5AQiABggAn8CojkhT5LsKG9B7rf4wgO1/Qk61mKR3 q9ZPPZcVzv2/UOS3ysDeBbkybc5+hTkD+b8Zpxe3e0Mlv8bqcJ3bdGRld2skuNls 7QamVHg68ZyQj0AZoXlRTZ4PjPfFCnabqevBRlxW/o04xr/DcqKeH1+C7Mb1h/QJ OatYAxIbZg94gocz0Io9E513qLQZfx/RUM2mU7FRoJVkw20hAIyKdtMOiTqcl7av J3G3QF0/ND0qu9C6q3EdjU0/t31i/wxS0vs/pHzBVvIhmslYPwpWaF1m7QwxIBYN oZls1ogToPgf4onpyq2wjnRiUICylOjggeUcQWepGTJjoBbO/aPftw== =/J53 -----END PGP SIGNATURE-----help
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