On Thu, Sep 17 2009, Markus Trippelsdorf wrote: > On Tue, Sep 08, 2009 at 10:00:42PM +0200, Jens Axboe wrote: > > On Mon, Sep 07 2009, Markus Trippelsdorf wrote: > > > Just got this error today in my dmesg: > > > btrfs csum failed ino 1483065 off 158482432 csum 4283543305 private 43905798 > > > > > > linux % find . -inum 1483065 > > > ./.git/objects/pack/pack-f9251bcc6a8afe3c92193e14d1d742f2f0182ce5.pack > > > > > > It's the main pack file from my git linux kernel tree: > > > > > > linux % ls -l ./.git/objects/pack/ > > > total 562848 > > > -rw-r--r-- 1 markus markus 1891324 2008-11-29 19:49 pack-011b43fa6956667db5e67fba859e40cb4b154226.idx > > > -rw-r--r-- 1 markus markus 44002938 2008-11-29 19:54 pack-011b43fa6956667db5e67fba859e40cb4b154226.pack.temp > > > -rw-r--r-- 1 markus markus 730332 2008-11-29 19:49 pack-67be92b3fab3dab175683582dab0b719517e55a5.idx > > > -r--r--r-- 1 markus markus 36061684 2009-09-06 21:48 pack-f9251bcc6a8afe3c92193e14d1d742f2f0182ce5.idx > > > -r--r--r-- 1 markus markus 335202742 2009-09-06 21:48 pack-f9251bcc6a8afe3c92193e14d1d742f2f0182ce5.pack > > > -rw------- 1 markus markus 158457856 2009-09-07 22:15 tmp_pack_OUdxER > > > > > > I'm running the latest git kernel and I've been using btrfs as my root > > > fs for the last few weeks without problems so far. > > > > Hmm, I ran into something very similar. Care to check what the corrupted > > block of data looks like (and how big it is)? > > I've hit the same problem again today: > > btrfs csum failed ino 1826333 off 150208512 csum 4148434891 private 1660028275 > > The file in question is: > ./.git/objects/pack/pack-a2330b703d5a7fd62626b39a5fdfb6eecf739d0d.pack > > I can't read the file directly, because of the csum mismatch: Chris, is there a way to force reading the file? Seems like that would be a very handy feature. Markus, not sure if that works, but you could always try and remount with data checksumming disabled. mount /dev/fooX -o remount,rw,nodatasum should do the trick. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
