doc/cephfs/posix: update #6922
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doc/cephfs/posix: update #6922
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| However, there are a few places where CephFS diverges from strict | ||
| POSIX semantics for various reasons: | ||
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| - In shared simultaneous writer situations, a write that crosses |
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Do we actually enable this case these days? I thought that we only had two clients writing simultaneously with the old O_LAZY flag, otherwise we can only have one writing at a time.
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If you have read+write or write+write we flip to LOCK_MIX mode, which gives out RD and WR caps but makes all IO synchronous (on RDCACHE or WRBUFFER). All reads and writes are effectively serialized at the OSD.
CEPH_IOC_LAZY asks the mds to give the client RDCACHE and WRBUFFER despite the sharing, which means the app is responsible for invalidating its cache or flushing changes at the appropriate points...
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seems good |
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Signed-off-by: Sage Weil <sage@redhat.com>
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Signed-off-by: Sage Weil sage@redhat.com