Am 22.11.2017 um 22:03 schrieb Michael Lyle: > On 11/22/2017 12:56 PM, Stefan Priebe - Profihost AG wrote: >> >> Am 22.11.2017 um 21:44 schrieb Michael Lyle: >>> On 11/22/2017 12:36 PM, Stefan Priebe - Profihost AG wrote: >>>> Am 22.11.2017 um 21:22 schrieb Michael Lyle: >>> mlyle@midnight:~/Downloads$ blkid 8k >>> 8k: UUID="65811163-4ffc-4823-ad72-bae10ce85b63" TYPE="bcache" >>> mlyle@midnight:~/Downloads$ blkid --version >>> blkid from util-linux 2.30.1 (libblkid 2.30.1, 20-Jul-2017) >>> >>> I don't understand, it seems OK. >> i think i remember that the xfs external log superblock is NOT at the >> beginning. Not sure where it is and yes there's an XFS on top of bcache... >> >> Greets, >> Stefan > > It shouldn't be an issue because: A) blkid should "favor" bcache, and B) > the other filesystem data structures should be offset and not at the > position that blkid will be looking for them. Can you check your blkid > version? If you strace blkid you see that it seeks several positions and reads them. Exmaple: read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096 lseek(3, 0, SEEK_SET) = 0 read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = 1024 lseek(3, 1024, SEEK_SET) = 1024 read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = 1024 lseek(3, 1048576, SEEK_SET) = 1048576 read(3, "ABTB\0\0\1\36\0\0\1\310\0\0\0\215\0029\335\334\0\0\0070\0029\355\f\0\0\4\0"..., 1024) = 1024 lseek(3, 3072, SEEK_SET) = 3072 read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = 1024 lseek(3, 7168, SEEK_SET) = 7168 read(3, "\0\0\232\352\0\0\0\26\0\0\233\301\0\0\0\20\0\0\234\21\0\0\0\34\0\0\234.\0\0\0\1"..., 1024) = 1024 lseek(3, 15360, SEEK_SET) = 15360 read(3, "\0\0'\353\0\0\0\1\0\0'\353\0\0\0\1\0\0'\353\0\0\0\1\0\0'\353\0\0\0\1"..., 1024) = 1024 lseek(3, 31744, SEEK_SET) = 31744 read(3, "\0\10\340\346\0\0\0\30\0\10\340\346\0\0\0\30drmtwsS0l\n1gKn80"..., 1024) = 1024 lseek(3, 64512, SEEK_SET) = 64512 read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = 1024 lseek(3, 0, SEEK_SET) = 0 mmap(NULL, 266240, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe60612000 read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 262144) = 262144 lseek(3, 393216, SEEK_SET) = 393216 > > Mike > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
