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Bug #1701

open

krbd: limits and constants are not consistent in kernel and userspace

Added by Josh Durgin over 12 years ago. Updated over 9 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
% Done:

0%

Source:
Tags:
Backport:
Regression:
Severity:
Reviewed:
Affected Versions:
ceph-qa-suite:
Crash signature (v1):
Crash signature (v2):

Description

There are a few things that exist in the kernel but not userspace:
  • SNAP_NAME_LEN
  • (MIN|MAX)_OBJECT_ORDER

Also, image name length is 96 in the kernel, but not enforced on the userspace side.

There are probably more issues like this that need fixing, and the limits should be documented.

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 #1

Updated by Stratos Psomadakis over 12 years ago

Instead of opening a new issue, I think I can add it here.

Besides those limits on the RBD images, there's also a hardcoded limit in libceph (messenger.c).
Object name (oid) is limited to 40 chars, so even though an RBD image can be up to 96 chars (100 with the suffix), the name is truncated, and the mapping will fail with ENOENT.

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 #2

Updated by Sage Weil over 12 years ago

Stratos Psomadakis wrote:

Instead of opening a new issue, I think I can add it here.

Besides those limits on the RBD images, there's also a hardcoded limit in libceph (messenger.c).
Object name (oid) is limited to 40 chars, so even though an RBD image can be up to 96 chars (100 with the suffix), the name is truncated, and the mapping will fail with ENOENT.

That's actually in teh kernel code, so i'll make a separate issue for it. Thanks!

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 #3

Updated by Josh Durgin over 12 years ago

Also related: we have MAX_POOL_NAME_SIZE and MAX_SNAP_NAME_SIZE as 128 in qemu right now.

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 #4

Updated by Sage Weil over 12 years ago

  • Translation missing: en.field_position set to 33
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 #5

Updated by Sage Weil over 12 years ago

  • Translation missing: en.field_position deleted (74)
  • Translation missing: en.field_position set to 54
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 #6

Updated by Sage Weil about 12 years ago

  • Category set to librbd
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 #7

Updated by Sage Weil almost 12 years ago

  • Project changed from Ceph to rbd
  • Category deleted (librbd)
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 #8

Updated by Ian Colle about 11 years ago

  • Assignee set to Alex Elder
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 #9

Updated by Ian Colle over 10 years ago

  • Assignee deleted (Alex Elder)
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 #10

Updated by Ilya Dryomov over 9 years ago

  • Project changed from rbd to Linux kernel client
  • Subject changed from rbd: limits and constants are not consistent in kernel and userspace to krbd: limits and constants are not consistent in kernel and userspace
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