Btrfs: Delete csum items when freeing extents

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This finishes off the new checksumming code by removing csum items
for extents that are no longer in use.

The trick is doing it without racing because a single csum item may
hold csums for more than one extent.  Extra checks are added to
btrfs_csum_file_blocks to make sure that we are using the correct
csum item after dropping locks.

A new btrfs_split_item is added to split a single csum item so it
can be split without dropping the leaf lock.  This is used to
remove csum bytes from the middle of an item.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2008-12-10 09:10:46 -05:00

parent 580afd76e4

commit 459931eca5

4 changed files with 335 additions and 41 deletions

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131

fs/btrfs/ctree.c

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13

fs/btrfs/ctree.h

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6

fs/btrfs/extent-tree.c

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226

fs/btrfs/file-item.c

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