CVS commit: src/sys/ufs/ffs

[Juergen Hannken-Illjes <hannken%netbsd.org@localhost>]

Module Name:    src
Committed By:   hannken
Date:           Wed Jul 30 10:09:30 UTC 2008

Modified Files:
        src/sys/ufs/ffs: ffs_snapshot.c

Log Message:
ffs_snapshot():
    Release allocated indir blocks on non-softdep file systems instead
    of writing them twice.
    It is sufficient to clean dirty data pages to avoid UBC inconsistencies.

ffs_snapblkfree() and wrsnapblk():
    If a snapshots effective link count is zero there is no need
    to use synchronous writes.

ffs_copyonwrite():
    Defer locking the snapshots until there is a need to copy the block.

wrsnapblk():
    Use vn_rdwr() instead of bwrite() to write to the snapshots.


To generate a diff of this commit:
cvs rdiff -r1.71 -r1.72 src/sys/ufs/ffs/ffs_snapshot.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.