sendfile() issue on lustre 1.4.x

The messages below relate to an issue with Lustre and sendfile() syscall. Lustre 1.4.x does not support it. The sendfile() syscall copies directly from disk to the network rather than doing multiple copies to memory or whatever. The messages are caused by proftp running on this server. You can disable sendfile() by recompiling proftp with it turned off

Oct 12 12:46:47 cthulhu kernel: Lustre: 1483:0:(rw.c:1380:ll_readpage()) ino 20592684 page 175 (716800) not covered by a lock (mmap?). check debug logs.
Oct 12 12:46:47 cthulhu kernel: Lustre: 1483:0:(rw.c:1380:ll_readpage()) previously skipped 286 similar messages
Oct 12 12:46:53 cthulhu kernel: Lustre: 1483:0:(rw.c:1380:ll_readpage()) ino 20592684 page 245 (1003520) not covered by a lock (mmap?). check debug logs.
Oct 12 12:46:53 cthulhu kernel: Lustre: 1483:0:(rw.c:1380:ll_readpage()) previously skipped 69 similar messages
Oct 12 13:56:26 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) ino 16526558 page 0 (0) not covered by a lock (mmap?). check debug logs.
Oct 12 13:56:26 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) previously skipped 15 similar messages
Oct 12 13:56:47 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) ino 16526526 page 0 (0) not covered by a lock (mmap?). check debug logs.
Oct 12 13:58:59 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) ino 27364595 page 0 (0) not covered by a lock (mmap?). check debug logs.
Oct 12 14:01:24 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) ino 13216322 page 0 (0) not covered by a lock (mmap?). check debug logs.
Oct 12 14:07:43 cthulhu kernel: Lustre: 3216:0:(rw.c:1380:ll_readpage()) ino 20459809 page 68 (278528) not covered by a lock (mmap?). check debug logs.
Oct 12 14:08:04 cthulhu kernel: Lustre: 3216:0:(rw.c:1380:ll_readpage()) ino 20459809 page 209 (856064) not covered by a lock (mmap?). check debug logs.
Oct 12 14:08:04 cthulhu kernel: Lustre: 3216:0:(rw.c:1380:ll_readpage()) previously skipped 140 similar messages
Oct 12 14:11:48 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) ino 19054807 page 42 (172032) not covered by a lock (mmap?). check debug logs.
Oct 12 14:11:48 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) previously skipped 37 similar messages
Oct 12 14:15:08 cthulhu kernel: Lustre: 3154:0:(rw.c:1380:ll_readpage()) ino 19054900 page 30 (122880) not covered by a lock (mmap?). check debug logs