This patchset implements the client 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 server side patch, posted separately. Most comments in there still apply, except that: 1. Client side caching is now included in this patch set. 2. 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. 3. The code is no longer conditioned on a config option. 4. The number of patches has been reduced somewhat by merging smaller, related ones. The client side caching is implemented through a per-inode hash table, which is allocated on demand. See fs/nfs/nfs42xattr.c for details. 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). * Stress tested caching, trying to run the client out of memory. * 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 (13): nfs,nfsd: NFSv4.2 extended attribute protocol definitions nfs: add client side only definitions for user xattrs NFSv4.2: query the server for extended attribute support NFSv4.2: define limits and sizes for user xattr handling NFSv4.2: add client side XDR handling for extended attributes nfs: define nfs_access_get_cached function NFSv4.2: query the extended attribute access bits nfs: modify update_changeattr to deal with regular files nfs: define and use the NFS_INO_INVALID_XATTR flag nfs: make the buf_to_pages_noslab function available to the nfs code NFSv4.2: add the extended attribute proc functions. NFSv4.2: hook in the user extended attribute handlers NFSv4.2: add client side xattr caching. fs/nfs/Makefile | 1 + fs/nfs/client.c | 19 +- fs/nfs/dir.c | 24 +- fs/nfs/inode.c | 16 +- fs/nfs/internal.h | 28 ++ fs/nfs/nfs42.h | 24 + fs/nfs/nfs42proc.c | 248 ++++++++++ fs/nfs/nfs42xattr.c | 1083 +++++++++++++++++++++++++++++++++++++++++++ fs/nfs/nfs42xdr.c | 442 ++++++++++++++++++ fs/nfs/nfs4_fs.h | 5 + fs/nfs/nfs4client.c | 31 ++ fs/nfs/nfs4proc.c | 248 ++++++++-- fs/nfs/nfs4super.c | 10 + fs/nfs/nfs4xdr.c | 29 ++ fs/nfs/nfstrace.h | 3 +- include/linux/nfs4.h | 25 + include/linux/nfs_fs.h | 12 + include/linux/nfs_fs_sb.h | 6 + include/linux/nfs_xdr.h | 60 ++- include/uapi/linux/nfs4.h | 3 + include/uapi/linux/nfs_fs.h | 1 + 21 files changed, 2276 insertions(+), 42 deletions(-) create mode 100644 fs/nfs/nfs42xattr.c -- 2.16.6
