Whoops, forgot to add Zheng. On Wed, Sep 2, 2015 at 10:11 AM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote: > On Wed, Sep 2, 2015 at 10:00 AM, Janusz Borkowski > <janusz.borkowski@xxxxxxxxxxxxxx> wrote: >> Hi! >> >> I mount cephfs using kernel client (3.10.0-229.11.1.el7.x86_64). >> >> The effect is the same when doing "echo >>" from another machine and from a >> machine keeping the file open. >> >> The file is opened with open( .., >> O_WRONLY|O_LARGEFILE|O_APPEND|O_BINARY|O_CREAT) >> >> Shell ">>" is implemented as (from strace bash -c "echo '7789' >> >> /mnt/ceph/test): >> >> open("/mnt/ceph/test", O_WRONLY|O_CREAT|O_APPEND, 0666) = 3 >> >> The test file had ~500KB size. >> >> Each subsequent "echo >>" writes to the start of the test file, first "echo" >> overwriting the original contents, next "echos" overwriting bytes written by >> the preceding "echo". > > Hmmm. The userspace (ie, ceph-fuse) implementation of this is a little > bit racy but ought to work. I'm not as familiar with the kernel code > but I'm not seeing any special behavior in the Ceph code — Zheng, > would you expect this to work? It looks like some of the linux > filesystems have their own O_APPEND handling and some don't, but I > can't find it in the VFS either. > -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com