On Tue, Dec 19 2017, Michael Kerrisk (man-pages) wrote: > On 12/18/2017 10:45 PM, NeilBrown wrote: >> On Mon, Dec 18 2017, Michael Kerrisk (man-pages) wrote: >> >>> Hello Neil >>> >>> There's a piece of your patch I don't understand. Please see below. >>> >>> On 12/13/2017 05:19 AM, NeilBrown wrote: >>>> >>>> If an advisory lock is lost, then read/write requests on any >>>> affected file descriptor can return EIO - for NFSv4 at least. >>>> >>>> Signed-off-by: NeilBrown <neilb@xxxxxxxx> >>>> --- >>>> man2/fcntl.2 | 24 ++++++++++++++++++++++++ >>>> man2/read.2 | 9 +++++++++ >>>> man2/write.2 | 9 +++++++++ >>>> 3 files changed, 42 insertions(+) >>>> >>>> diff --git a/man2/fcntl.2 b/man2/fcntl.2 >>>> index 67642384154c..6e6e26f66aa0 100644 >>>> --- a/man2/fcntl.2 >>>> +++ b/man2/fcntl.2 >>>> @@ -669,6 +669,30 @@ and >>>> Mandatory locking is not specified by POSIX. >>>> Some other systems also support mandatory locking, >>>> although the details of how to enable it vary across systems. >>>> +.SS Lost locks >>>> +When an advisory lock is obtained on a networked filesystem such as >>>> +NFS it is possible that the lock might get lost. >>>> +This may happen due to administrative action on the server, or due to a >>>> +network partition which lasts long enough for the server to assume >>> >>> What does "network partition which lasts long enough" mean? >>> I think this perhaps needs to be clarified a little. At least, >>> I don't understand it. >> >> "network partition" is a term using the NFS RFCs for any situation that >> that results in the server and client not being able to communicate >> (that are partitioned, one from the other? There is partition (wall) >> between them? They are in separate partitions?). >> I can see how the meaning might not be obvious if you hadn't come across >> it before. >> >> If we change "network partition" to "loss of connectivity", would that >> make it clear. Is "loss of network connectivity with the server" too >> verbose? > > Thanks, Neil. I've applied your patch and added the words "loss of network > connectivity with the server". Looks good. Thanks! NeilBrown
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