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  1. 23 6月, 2014 1 次提交
  3. 18 6月, 2014 2 次提交
    • K
      NFSD: fix bug for readdir of pseudofs · f41c5ad2
      由 Kinglong Mee 提交于 
      Commit 561f0ed4 (nfsd4: allow large readdirs) introduces a bug
about readdir the root of pseudofs.

Call xdr_truncate_encode() revert encoded name when skipping.
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
      f41c5ad2
    • N
      NFSD: Don't hand out delegations for 30 seconds after recalling them. · 6282cd56
      由 NeilBrown 提交于 
      If nfsd needs to recall a delegation for some reason it implies that there is
contention on the file, so further delegations should not be handed out.

The current code fails to do so, and the result is effectively a
live-lock under some workloads: a client attempting a conflicting
operation on a read-delegated file receives NFS4ERR_DELAY and retries
the operation, but by the time it retries the server may already have
given out another delegation.

We could simply avoid delegations for (say) 30 seconds after any recall, but
this is probably too heavy handed.

We could keep a list of inodes (or inode numbers or filehandles) for recalled
delegations, but that requires memory allocation and searching.

The approach taken here is to use a bloom filter to record the filehandles
which are currently blocked from delegation, and to accept the cost of a few
false positives.

We have 2 bloom filters, each of which is valid for 30 seconds.   When a
delegation is recalled the filehandle is added to one filter and will remain
disabled for between 30 and 60 seconds.

We keep a count of the number of filehandles that have been added, so when
that count is zero we can bypass all other tests.

The bloom filters have 256 bits and 3 hash functions.  This should allow a
couple of dozen blocked  filehandles with minimal false positives.  If many
more filehandles are all blocked at once, behaviour will degrade towards
rejecting all delegations for between 30 and 60 seconds, then resetting and
allowing new delegations.
Signed-off-by: NNeilBrown <neilb@suse.de>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
      6282cd56
  5. 10 6月, 2014 1 次提交
  7. 07 6月, 2014 4 次提交
    • J
      nfsd: don't halt scanning the DRC LRU list when there's an RC_INPROG entry · 1b19453d
      由 Jeff Layton 提交于 
      Currently, the DRC cache pruner will stop scanning the list when it
hits an entry that is RC_INPROG. It's possible however for a call to
take a *very* long time. In that case, we don't want it to block other
entries from being pruned if they are expired or we need to trim the
cache to get back under the limit.

Fix the DRC cache pruner to just ignore RC_INPROG entries.
Signed-off-by: NJeff Layton <jlayton@primarydata.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
      1b19453d
    • J
      nfsd4: kill READ64 · 542d1ab3
      由 J. Bruce Fields 提交于 
      Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
      542d1ab3
    • J
      nfsd4: kill READ32 · 06553991
      由 J. Bruce Fields 提交于 
      While we're here, let's kill off a couple of the read-side macros.

Leaving the more complicated ones alone for now.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
      06553991
    • J
      nfsd4: simplify server xdr->next_page use · 05638dc7
      由 J. Bruce Fields 提交于 
      The rpc code makes available to the NFS server an array of pages to
encod into.  The server represents its reply as an xdr buf, with the
head pointing into the first page in that array, the pages ** array
starting just after that, and the tail (if any) sharing any leftover
space in the page used by the head.

While encoding, we use xdr_stream->page_ptr to keep track of which page
we're currently using.

Currently we set xdr_stream->page_ptr to buf->pages, which makes the
head a weird exception to the rule that page_ptr always points to the
page we're currently encoding into.  So, instead set it to buf->pages -
1 (the page actually containing the head), and remove the need for a
little unintuitive logic in xdr_get_next_encode_buffer() and
xdr_truncate_encode.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
      05638dc7
  9. 05 6月, 2014 5 次提交
  11. 31 5月, 2014 27 次提交