Btrfs: update backrefs while dropping snapshot

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The new backref format has restriction on type of backref item.  If a tree
block isn't referenced by its owner tree, full backrefs must be used for the
pointers in it. When a tree block loses its owner tree's reference, backrefs
for the pointers in it should be updated to full backrefs. Current
btrfs_drop_snapshot misses the code that updates backrefs, so it's unsafe for
general use.

This patch adds backrefs update code to btrfs_drop_snapshot.  It isn't a
problem in the restricted form btrfs_drop_snapshot is used today, but for
general snapshot deletion this update is required.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Yan Zheng

2009-06-27 21:07:35 -04:00

committed by Chris Mason

parent a970b0a16c

commit 2c47e605a9

4 changed files with 400 additions and 186 deletions

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fs/btrfs/extent-tree.c

+395 -179

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