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Previously, when writing to /proc/net/rpc/*/channel, if a cache line
were larger than the default buffer size (likely 1024 bytes), mountd
and svcgssd would split writes into a number of buffer-sized writes.
Each of these writes would get an EINVAL error back from the kernel
procfs handle (it expects line-oriented input and does not account for
multiple/split writes), and no cache update would occur.
When such behavior occurs, NFS clients depending on mountd to finish
the cache operation would block/hang, or receive EPERM, depending on
the context of the operation. This is likely to happen if a user is a
member of a large (~100-200) number of groups.
Instead, every fopen() on the procfs files in question is followed by
a call to setvbuf(), using a per-file dedicated buffer of
RPC_CHAN_BUF_SIZE length.
Really, mountd should not be using stdio-style buffered file operations
on files in /proc to begin with. A better solution would be to use
internally managed buffers and calls to write() instead of these stdio
calls, but that would be a more extensive change; so this is proposed
as a quick and not-so-dirty fix in the meantime.
Signed-off-by: Sean Finney <sean.finney@sonyericsson.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Clean up: Get rid of hostent-based DNS helper functions in
libexport.a that have been replaced by addrinfo-based DNS helpers.
None of the original code remains, so replace the copyright notice as
well.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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So that exportfs can eventually support IPv6 addresses, copy statd's
getaddrinfo(3)-based matchhostname to exportfs, with adjustments for
dealing with export wildcards and netgroups. Until exportfs has full
IPv6 support, however, we want to ensure that IPv6 addresses continue
to remain blocked in the address comparison code used by exportfs. At
a later point we'll replace much of this with the generic functions
in sockaddr.h.
Since it contains special logic for handling wildcard and netgroups,
this function is specialized for exportfs, and does not belong in
one of the shared libraries.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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