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fs: btrfs: support sparse extents

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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: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Marek Behún 2020-03-30 18:48:42 +02:00 committed by Tom Rini
parent f4a1426fd6
commit 48180e15d3
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/extent-io.c
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@ -78,6 +78,12 @@ u64 btrfs_read_extent_reg(struct btrfs_path *path,
if (size > dlen - offset)
size = dlen - offset;
/* sparse extent */
if (extent->disk_bytenr == 0) {
memset(out, 0, size);
return size;
}
physical = btrfs_map_logical_to_physical(extent->disk_bytenr);
if (physical == -1ULL)
return -1ULL;