diff options
Diffstat (limited to 'sys/nfsclient/nfs_vfsops.c')
| -rw-r--r-- | sys/nfsclient/nfs_vfsops.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sys/nfsclient/nfs_vfsops.c b/sys/nfsclient/nfs_vfsops.c index 82891f9..58384e8 100644 --- a/sys/nfsclient/nfs_vfsops.c +++ b/sys/nfsclient/nfs_vfsops.c @@ -56,6 +56,7 @@ __FBSDID("$FreeBSD$"); #include <sys/socketvar.h> #include <sys/sockio.h> #include <sys/sysctl.h> +#include <sys/syslog.h> #include <sys/vnode.h> #include <sys/signalvar.h> @@ -1116,6 +1117,19 @@ nfs_mount(struct mount *mp) error = EIO; goto out; } + + /* + * If a change from TCP->UDP is done and there are thread(s) + * that have I/O RPC(s) in progress with a tranfer size + * greater than NFS_MAXDGRAMDATA, those thread(s) will be + * hung, retrying the RPC(s) forever. Usually these threads + * will be seen doing an uninterruptible sleep on wait channel + * "newnfsreq" (truncated to "newnfsre" by procstat). + */ + if (args.sotype == SOCK_DGRAM && nmp->nm_sotype == SOCK_STREAM) + tprintf(curthread->td_proc, LOG_WARNING, + "Warning: mount -u that changes TCP->UDP can result in hung threads\n"); + /* * When doing an update, we can't change from or to * v3, switch lockd strategies or change cookie translation |
