K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2010-04-23T09:09:39.294153Z
K 7
svn:log
V 824
Fix snapshots on SUJ protected filesystems.
 - Expunge the journal file from the snapshot filesystem.  This leaves it
   present with a zero byte file.
 - Unfortunately expunging is insufficient to prevent a deadlock between
   the snaplk and jwait.  Implement a B_NOCOPY flag that causes a buf write
   to skip ffs_copyonwrite all together.
 - When removing a snapshot sync the re-written indirect blocks before
   calling truncate.  This is a long-standing snapshot bug that applies to
   any softdep protected ffs filesystem.  The dirtied indirect blocks have
   no dependencies so softdep_setup_freeblocks will discard their contents
   and use the physical disk block addresses in indir_trunc() when removing
   the file.  This can lead to indir_trunc discovering block pointers with
   BLK_NOCOPY and BLK_SNAP values.

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