tree 89b9ea993834f57b7390a24fdfacf6099b854b54
parent fb6e7113ae3ba6c7d0de77c6ccbcfa659899ff0f
author Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1243678089 +0900
committer Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1244644872 +0900

nilfs2: return EBUSY against delete request on snapshot

This helps userland programs like the rmcp command to distinguish
error codes returned against a checkpoint removal request.

Previously -EPERM was returned, and not discriminable from real
permission errors.  This also allows removal of the latest checkpoint
because the deletion leads to create a new checkpoint, and thus it's
harmless for the filesystem.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>