Public bug reported:
Runnning blkid on a raid5 partition of ~3Tb no data is retrieved.
Smaller partitions works fine.
This is cause by a call to ioctl(_, BLKGETSIZE, _) which returns -1
EFBIG (File too large).
root@myth:/# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md1 : active raid5 sdd1[2] sdc1[1]
8386528 blocks super 1.2 level 5, 16k chunk, algorithm 2 [3/2] [_UU]
md0 : active raid5 sdd2[2] sdc2[1]
2921883360 blocks super 1.2 level 5, 16k chunk, algorithm 2 [3/2] [_UU]
unused devices: <none>
root@myth:/# blkid /dev/md0 /dev/md1
/dev/md1: LABEL="x5" UUID="0c4bdd32-aec9-442e-baa1-e8011f970943"
UUID_SUB="0363dc7e-f786-4dad-acc6-e52cc7f075c6" TYPE="btrfs"
Here is the relevant part of an strace of the situation. Notice that
stat64 is used, but BLKGETSIZE64 is not :)
root@myth:/# strace blkid /dev/md0 2>&1 | less
...
stat64("/dev/md0", {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 0), ...}) = 0
open("/dev/md0", O_RDONLY|O_LARGEFILE) = 3
fadvise64_64(3, 0, 0, POSIX_FADV_RANDOM) = 0
fstat64(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(9, 0), ...}) = 0
uname({sys="Linux", node="myth", ...}) = 0
ioctl(3, BLKGETSIZE, 0xbf9616bc) = -1 EFBIG (File too large)
close(3) = 0
...
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: util-linux 2.17.2-9.1ubuntu4
ProcVersionSignature: Ubuntu 3.0-2.3-generic 3.0.0-rc4
Uname: Linux 3.0-2-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sun Aug 14 10:33:40 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 natty
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https://bugs.launchpad.net/bugs/826165
Title:
blkid breaks on large partitions (BLKGETSIZE)
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