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Commit 06a0167f authored by Marek Behun's avatar Marek Behun
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fs: btrfs: support sparse extents


When logical address of a regular extent is 0, the extent is sparse and
consists of all zeros.

Without this when sparse extents are used in a file reading fails with
  Cannot map logical address 0 to physical

Signed-off-by: default avatarMarek Behún <marek.behun@nic.cz>
parent a714befa
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