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CVS commit: src/sys/ufs/ffs

Module Name:    src
Committed By:   hannken
Date:           Mon Feb 21 09:29:21 UTC 2011

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

Log Message:
Change the snapshot lock:
- No need to take the snapshot lock while the file system is suspended.
- Allow ffs_copyonwrite() one level of recursion with snapshots locked.
- Do the block address lookup with snapshots locked.
- Take the snapshot lock while removing a snapshot from the list.

While hunting deadlocks change the transaction scope for ffs_snapremove().
We could deadlock from UFS_WAPBL_BEGIN() with a buffer held.

To generate a diff of this commit:
cvs rdiff -u -r1.105 -r1.106 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.

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