storage: introduce CasManager to support chunk dedup at runtime #1626
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #1626 +/- ##
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+ Coverage 60.43% 60.51% +0.07%
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Files 146 146
Lines 48841 49178 +337
Branches 46322 46659 +337
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+ Hits 29517 29760 +243
- Misses 17558 17636 +78
- Partials 1766 1782 +16
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Add helper copy_file_range() which: - avoid copy data into userspace - may support reflink on xfs etc Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
- improve copy_file_range when target os is not linux - add more comprehensive tests Signed-off-by: Yadong Ding <ding_yadong@foxmail.com>
Implement CasManager to support chunk dedup at runtime. The manager provides to major interfaces: - add chunk data to the CAS database - check whether a chunk exists in CAS database and copy it to blob file by copy_file_range() if the chunk exists. Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
- Changed `delete_blobs` method in `CasDb` to take an immutable reference (`&self`) instead of a mutable reference (`&mut self`). - Updated `dedup_chunk` method in `CasMgr` to correctly handle the deletion of non-existent blob files from both the file descriptor cache and the database. - Implemented the `gc` (garbage collection) method in `CasMgr` to identify and remove blobs that no longer exist on the filesystem, ensuring the database and cache remain consistent. Signed-off-by: Yadong Ding <ding_yadong@foxmail.com>
Enable chunk deduplication for file cache. It works in this way: - When a chunk is not in blob cache file yet, inquery CAS database whether other blob data files have the required chunk. If there's duplicated data chunk in other data files, copy the chunk data into current blob cache file by using copy_file_range(). - After downloading a data chunk from remote, save file/offset/chunk-id into CAS database, so it can be reused later. Co-authored-by: Jiang Liu <gerry@linux.alibaba.com> Co-authored-by: Yading Ding <ding_yadong@foxmail.com> Signed-off-by: Yadong Ding <ding_yadong@foxmail.com>
Add documentation for cas. Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
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Add smoking test case for cas and chunk dedup. Signed-off-by: Yadong Ding <ding_yadong@foxmail.com>
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Base #1507, complete implementation and testing.
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