Now that the new wait_on_bit code is in the kernel (in 3.17-rc1) these
last two patches to support deadlock-free loop-back NFS mounts can be
applied (hopefully to go upstream for 3.18-rc1).
A deadlock can happen if nfsd tries to allocate memory, calls
->releasepage() on a page in an NFS filesystem, and nfs_release_page()
blocks waiting for the nfsd to confirm the COMMIT.
With this patch nfs_release_page() will not wait more than 100ms
for COMMIT to a non-remote nfs fileserver.
Thanks,
NeilBrown
---
NeilBrown (2):
SUNRPC: track when a client connection is routed to the local host.
NFS: avoid deadlocks with loop-back mounted NFS filesystems.
fs/nfs/file.c | 2 +
fs/nfs/write.c | 72 ++++++++++++++++++++++++++++++++++++++++---
include/linux/freezer.h | 10 ++++++
include/linux/sunrpc/clnt.h | 1 +
include/linux/sunrpc/xprt.h | 1 +
include/uapi/linux/nfs_fs.h | 3 ++
net/sunrpc/clnt.c | 25 +++++++++++++++
net/sunrpc/xprtsock.c | 9 +++++
8 files changed, 117 insertions(+), 6 deletions(-)
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