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There's filefrag already, and that works, but, it's output is very inconsistent between various OS release versions, and it has already meant that we'd needed to adjust tests to account for these little but insignificant changes. A lot more work than useful. It's even more changed in el9. This adds `scoutfs get-fiemap FILE` and prints out block extent info with flags that we care about as an abbreviated letter: U for Unwritten, L for Last, and O for Unknown (as in, "offline"). The -P/--physical and -L/--logical options turn off logical or physical offset display, in case you only want to see the offsets in either units. You can pass -b/--byte to display offsets and lengths in byte values. The block size will then be obtained from fstat() of the queried file (4096 for scoutfs). I've removed all uses of filefrag from our scoutfs tests. Xfstests still calls it but their internal diff takes care of that issue. Where needed and appropriate, the tests are adjusted so that the output of `scoutfs get-fiemap` is as close as it can to what it used to be, so that reading the test results allows the quick view of what might have been going wrong. There are some output strings I have not bothered to update because there's no real value to updating every output string to match, and we just adjust the golden file accordingly. Signed-off-by: Auke Kok <auke.kok@versity.com>
Introduction
scoutfs is a clustered in-kernel Linux filesystem designed to support large archival systems. It features additional interfaces and metadata so that archive agents can perform their maintenance workflows without walking all the files in the namespace. Its cluster support lets deployments add nodes to satisfy archival tier bandwidth targets.
The design goal is to reach file populations in the trillions, with the archival bandwidth to match, while remaining operational and responsive.
Highlights of the design and implementation include:
- Fully consistent POSIX semantics between nodes
- Atomic transactions to maintain consistent persistent structures
- Integrated archival metadata replaces syncing to external databases
- Dynamic seperation of resources lets nodes write in parallel
- 64bit throughout; no limits on file or directory sizes or counts
- Open GPLv2 implementation
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