Btrfs: Add btrfs_duplicate_item

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btrfs_duplicate_item duplicates item with new key, guaranteeing
the source item and the new items are in the same tree leaf and
contiguous. It allows us to split file extent in place, without
using lock_extent to prevent bookend extent race.

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

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Yan, Zheng 2009-11-12 09:33:58 +00:00 • committed by Chris Mason

parent 8cef4e160d

commit ad48fd7546

2 changed files with 143 additions and 59 deletions

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198

fs/btrfs/ctree.c

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4

fs/btrfs/ctree.h

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