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Reducing the number of slots in the session slot table requires confirmation from the client. This patch adds reduce_session_slots() which starts the process of getting confirmation, but never calls it. That will come in a later patch. Before we can free a slot we need to confirm that the client won't try to use it again. This involves returning a lower cr_maxrequests in a SEQUENCE reply and then seeing a ca_maxrequests on the same slot which is not larger than we limit we are trying to impose. So for each slot we need to remember that we have sent a reduced cr_maxrequests. To achieve this we introduce a concept of request "generations". Each time we decide to reduce cr_maxrequests we increment the generation number, and record this when we return the lower cr_maxrequests to the client. When a slot with the current generation reports a low ca_maxrequests, we commit to that level and free extra slots. We use an 16 bit generation number (64 seems wasteful) and if it cycles we iterate all slots and reset the generation number to avoid false matches. When we free a slot we store the seqid in the slot pointer so that it can be restored when we reactivate the slot. The RFC can be read as suggesting that the slot number could restart from one after a slot is retired and reactivated, but also suggests that retiring slots is not required. So when we reactive a slot we accept with the next seqid in sequence, or 1. When decoding sa_highest_slotid into maxslots we need to add 1 - this matches how it is encoded for the reply. se_dead is moved in struct nfsd4_session to remove a hole. Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.