Zach Brown 24cc5cc296 scoutfs: lock manifest root request ...

The manifest root request processing samples the stable_manifest_root in
the server info.  The stable_manifest_root is updated after a
commit has suceeded.

The read of stable_manifest_root in request processing was locking the
manifest.  The update during commit doesn't lock the manifest so these
paths were racing.  The race is very tight, a few cpu stores, but it
could in theory give a client a malformed root that could be
misinterpreted as corruption.

Add a seqcount around the store of the stable manifest root during
commit and its load during request processing.  This ensures that
clients always get a consistent manifest root.

Signed-off-by: Zach Brown <zab@versity.com>

2018-04-27 09:06:35 -07:00

kmod

scoutfs: lock manifest root request

2018-04-27 09:06:35 -07:00

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