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bcachefs: Unwritten extents support

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- bch2_extent_merge checks unwritten bit
 - read path returns 0s for unwritten extents without actually reading
 - reflink path skips over unwritten extents
 - bch2_bkey_ptrs_invalid() checks for extents with both written and
   unwritten extents, and non-normal extents (stripes, btree ptrs) with
   unwritten ptrs
 - fiemap checks for unwritten extents and returns
   FIEMAP_EXTENT_UNWRITTEN

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2022-11-13 18:59:01 -05:00
commit 792031116b
8 changed files with 69 additions and 16 deletions
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