This patchset implements the server side for NFS user extended attributes, as defined in RFC8726. This was originally posted as an RFC in: https://patchwork.kernel.org/cover/11143565/ Patch 1 is shared with the client side patch, posted separately. Most comments in there still apply, except that: 1. As per the discussion, user extended attributes are enabled if the client and server support them (e.g. they support 4.2 and advertise the user extended attribute FATTR). There are no longer options to switch them off on either the client or the server. 2. The code is no longer conditioned on a config option. 3. The number of patches has been reduced somewhat by merging smaller, related ones. This has been tested as follows: * Linux client and server: * Test all corner cases (XATTR_SIZE_*) * Test all failure cases (no xattr, setxattr with different or invalid flags, etc). * Verify the content of xattrs across several operations. * Use KASAN and KMEMLEAK for a longer mix of testruns to verify that there were no leaks (after unmounting the filesystem). * Tested against the FreeBSD-current implementation as well, which works (after I fixed 2 bugs in that implementation, which I'm sending out to them too). * Not tested: RDMA (I couldn't get a setup going). Frank van der Linden (14): nfs,nfsd: NFSv4.2 extended attribute protocol definitions xattr: modify vfs_{set,remove}xattr for NFS server use nfsd: split off the write decode code in to a separate function nfsd: make sure the nfsd4_ops array has the right size nfsd: add defines for NFSv4.2 extended attribute support nfsd: define xattr functions to call in to their vfs counterparts nfsd: take xattr bits in to account for permission checks nfsd: add structure definitions for xattr requests / responses nfsd: use kvmalloc in svcxdr_tmpalloc nfsd: implement the xattr procedure functions. nfsd: add user xattr RPC XDR encoding/decoding logic nfsd: add xattr operations to ops array xattr: add a function to check if a namespace is supported nfsd: add fattr support for user extended attributes fs/nfsd/nfs4proc.c | 141 +++++++++++- fs/nfsd/nfs4xdr.c | 535 +++++++++++++++++++++++++++++++++++++++++++--- fs/nfsd/nfsd.h | 5 +- fs/nfsd/vfs.c | 142 ++++++++++++ fs/nfsd/vfs.h | 10 + fs/nfsd/xdr4.h | 31 +++ fs/xattr.c | 90 +++++++- include/linux/nfs4.h | 22 +- include/linux/xattr.h | 4 + include/uapi/linux/nfs4.h | 3 + 10 files changed, 940 insertions(+), 43 deletions(-) -- 2.16.6
