fault vs truncate/invalidate race fix
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- v1 Latest6 patches 80 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/6 | mm: debug check for the fault vs invalidate racemm/ | +2 | 0 replies | |
| 2/6 | mm: simplify filemap_nopagemm/ | +0 | 0 replies | |
| 3/6 | mm: fix fault vs invalidate race for linear mappingsfs/ fs/ fs/ +7 more | +113 | 4 replies | |
| 4/6 | mm: merge populate and nopage into fault (fixes nonlinear)Documentation/ Documentation/ fs/ +16 more | +371 | 81 replies | |
| 5/6 | mm: merge nopfn into faultarch/ drivers/ include/ +1 more | +71 | 1 reply | |
| 6/6 | mm: remove legacy cruftDocumentation/ include/ mm/ +2 more | +19 | 0 replies |
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Cover letter [patch 0/6] fault vs truncate/invalidate race fix
The following set of patches are based on current git.
These fix the fault vs invalidate and fault vs truncate_range race for filemap_nopage mappings, plus those and fault vs truncate race for nonlinear mappings.
These patches fix silent data corruption that we've had several people hitting in SUSE kernels. Our kernels have similar patches to lock the page over page fault, and no problem.
I've also got rid of the horrible populate API, and integrated nonlinear pages properly with the page fault path.
Downside is that this adds one more vector through which the buffered write deadlock can occur. However this is just a very tiny one (pte being unmapped for reclaim), compared to all the other ways that deadlock can occur (unmap, reclaim, truncate, invalidate). I doubt it will be noticable. At any rate, it is better than data corruption.
I hope these can get merged (at least into -mm) soon.
Thanks,
Nick
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SuSE Labs
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