On Sun, Sep 9, 2012 at 11:09 AM, Anand Avati <anand.avati@xxxxxxxxx> wrote:
On Sun, Sep 9, 2012 at 10:53 AM, Gustavo Bervian Brand <gugabrand@xxxxxxxxx> wrote:
Hello,I'm implementing a translator and at the moment I'm trying to "cache" at the local node's disk the files read from other node.When reading a file from a certain node, at the file open function it's added an extended metadata at the original file with info about where this file (or part of it) is copied, calling syncop_setxattr to the proper child to do it.So, once open is done the readv comes and if this file was not already read/cached, at the readv_cbk (before stack unwind) I am trying to create a local file with the content got from the original node.
For that purpose, I am using syncop_create / setattr / write. But the syncop_create is always failing with Stale NFS file handle error.I tried to copy the same gfid and pargfid of the loc_t used at open function (saved), it didn't work, tried to zero them, nothing... and manipulated all the variables used at the syncop_create call... but nothing worked to get a success return from syncop_create.Is there some requirement to call syncop_create, or a good way to track the exact reason for this failure (I could see it's not even reaching the client_create() call through gdb)? I am using the code from the master branch of 1 week ago. Any comment is welcome.
And BTW, I hope you are performing the syncop_XXXX() calls inside a synctask_new() worker?
Avati
Part of the log:[2012-09-09 17:04:16.357875] I [gbfs_t.c:361:gbfs_open_cbk] 0-gbfs-test: entering gbfs_open_cbk function[2012-09-09 17:04:16.358026] I [gbfs_t.c:169:gbfs_readv] 0-gbfs-test: entering gbfs_readv function[2012-09-09 17:04:16.358156] I [gbfs_t.c:46:gbfs_readv_cbk] 0-gbfs-test: entering gbfs_readv_cbk function[2012-09-09 17:04:16.358192] I [gbfs_t.c:132:gbfs_readv_cbk] 0-gbfs-test: failed to create /35a710dd on examplevol-client-0 (Stale NFS file handle)It will be good to put a break-point at gbfs_readv_cbk to inspect the backtrace to find which layer did the STACK_UNWIND(..,ESTALE...); and continue debugging from there.For a create, you are expected to:- fill loc.pargfid- fill loc.basename- fill loc.inode (obtained via inode_new())- fill "gfid-req" key in xdata dictionary with a GFID to be assigned for the newly created file.You can inspect posix_create() and client_create() to double check what the "dependencies" are. Note that if what you are creating is just a cached version of the original file, then it might be a good idea to re-use its gfid too.Avati
