bcachefs: Fix for leaking of reflinked extents

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When a reflink pointer points to only part of an indirect extent, and
then that indirect extent is fragmented (e.g. by copygc), if the reflink
pointer only points to one of the fragments we leak a reference.

Fix this by storing front/back pad values in reflink pointers - when
inserting reflink pointesr, we initialize them to cover the full range
of the indirect extents we reference.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

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Kent Overstreet 2021-10-14 09:54:47 -04:00 • committed by Kent Overstreet

parent bfe88863cf

commit 6d76aefea1

4 changed files with 58 additions and 11 deletions

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15

fs/bcachefs/bcachefs_format.h

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45

fs/bcachefs/buckets.c

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5

fs/bcachefs/fsck.c

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4

fs/bcachefs/reflink.c

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