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Bug #8630

open

UFS imposes 18bit minor number limit on the whole system

Added by Hans Rosenfeld over 4 years ago. Updated about 4 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
filesystems (not ZFS)
Start date:
2017-09-07
Due date:
% Done:

0%

Estimated time:
Difficulty:
Medium
Tags:
needs-triage
Gerrit CR:

Description

UFS currently only supports storing a dev32_t in the inode. Since both dev(7FS) and devfs(7FS) use the underlying filesystem to store device nodes and their permissions permanently, ddi_minor_create_common() will refuse to create nodes whose minor numbers won't fit into a dev32_t, thereby limiting minor numbers to 18bits.

The dev32_t is stored in the on-disk inode in the otherwise unused array of direct disk blocks. It should be possible to store a full 64bit dev_t in that array. A new superblock flag would indicate when a 64bit dev_t is stored on the FS, preventing access by older software similar to FSLARGEFILES.

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