[Bug 826165] Re: blkid breaks on large partitions (BLKGETSIZE)

[HelgeJensen]

Compiling the util-linux 2.19.1 from oneiric and installing into natty
solved the issue:


root at myth:~/opt/fix_util_linux/oneiric# mdadm --create /dev/md0 --level=5 --chunk=4 --raid-devices=3 /dev/sdc2 /dev/sdd2 missing
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
root at myth:~/opt/fix_util_linux/oneiric# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdd2[1] sdc2[0]
      2926077680 blocks super 1.2 level 5, 4k chunk, algorithm 2 [3/2] [UU_]

unused devices: <none>
root at myth:~/opt/fix_util_linux/oneiric# mkfs.btrfs -L r5 /dev/md0
root at myth:~/opt/fix_util_linux/oneiric# blkid /dev/md0
/dev/md0: LABEL="r5" UUID="9017f89e-e8a3-4ef5-93f5-d4fad7382557" UUID_SUB="cdce6562-3ba1-473e-ad3b-aab525b1f7fb" TYPE="btrfs"


** Changed in: util-linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/826165

Title:
  blkid breaks on large partitions (BLKGETSIZE)

Status in “util-linux” package in Ubuntu:
  Confirmed

Bug description:
  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 at 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 at 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 at 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)

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