[LU-137] ioctl passthrough mechanism for Lustre OST/MDT mountpoints

• Type: New Feature
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Affects Version/s: Lustre 2.1.0, Lustre 2.5.0
• Labels: patch
• Bugzilla ID: 14,489
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

Implement an interface for sending IO Control (ioctl) commands from userspace through the Lustre mount point to the underlying ldiskfs filesystem to allow execution of filesystem-wide ioctl() commands, such as resize. This will allow user-space tools that operate via ioctl() commands on the filesystem mountpoint to be used on the Lustre MDT and OST filesystems while they are mounted and in use subject to any limitations of the original ioctl() commands themselves.

Issue Links

• is related to: LU-5822 health_check file not updating properly
• is related to: LU-4795 server_put_mount() calls server_deregister_mount() even if this isn't the last reference
• is related to: LU-8151 OST/MDT /proc/mounts always shows "ro" for server mountpoints
• is related to: LU-16835 lustre-initialization: Operation not supported while trying to set fs label, tune2fs 1.47.0-wc1
• is related to: LU-4931 New feature of giving server/storage side advice of accessing file
• is related to: LU-17027 missing #include <linux/file.h> in lustre/target/tgt_mount.c
• is related to: LU-6202 clean up ioctl handling
• is related to: LU-11355 Add Lustre trim support