ports/154930: ZFS: cannot delete/unlink file from full volume -> ENOSPC

[Matthias Andree]

>Number:         154930
>Category:       ports
>Synopsis:       ZFS: cannot delete/unlink file from full volume -> ENOSPC
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Feb 21 09:30:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Matthias Andree
>Release:        8.2-PRERELEASE
>Organization:
FreeBSD
>Environment:
FreeBSD apollo.emma.line.org 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #61: Tue Feb 15 23:03:47 CET 2011     root at apollo.emma.line.org:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
On a 100% full ZFS volume, deleting files is not possible and results in ENOSPC (no space on device).  I suppose this is due to the write-ahead logging nature.

Workaround: truncate files to be deleted to make room for the logs.

Suggestion: consider implicitly truncating a file to be deleted if there is not sufficient disk space to delete the file otherwise.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: