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nvlist: Add nvlist_snprintf() and zfs_dbgmsg_nvlist() #17215

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nvlist: Add nvlist_snprintf() and zfs_dbgmsg_nvlist() #17215

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tonyhutter
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Motivation and Context

Over the years I've wanted an easy way to print an nvlist in kernel space.

Description

Add nvlist_snprintf() to print a nvlist to a buffer. This is basically the snprintf() version of dump_nvlist(). Along with that, add a zfs_dbgmsg_nvlist() to print out an nvlist to dbgmsg. This will aid in debugging.

How Has This Been Tested?

Manually tested

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Performance enhancement (non-breaking change which improves efficiency)
  • Code cleanup (non-breaking change which makes code smaller or more readable)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
  • Documentation (a change to man pages or other documentation)

Checklist:

amotin
amotin reviewed Apr 8, 2025
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@amotin amotin added the Status: Code Review Needed Ready for review and testing label Apr 8, 2025
@tonyhutter
nvlist: Add nvlist_snprintf() and zfs_dbgmsg_nvlist()
eb8941d 
Add nvlist_snprintf() to print a nvlist to a buffer.  This is basically
the snprintf() version of dump_nvlist().  Along with that, add a
zfs_dbgmsg_nvlist() to print out an nvlist to dbgmsg.  This will aid in
debugging.

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
@tonyhutter
Update ABI files for add nvlist_snprintf() commit
cefdf57 
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
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@amotin amotin amotin approved these changes

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@tonyhutter @amotin