Adds support for using the NFS v4.2 operation IO_ADVISE to send client I/O access pattern hints to the server. There is a one-to-one correspondence between the advice (POSIX_FADV_*) given in fadvise64() and the bitmap mask sent to the server. Any other advice given, results in just calling generic_fadvise(). The bitmap mask given by the server reply is just ignored since the fadvise64() returns 0 on success. If server replies with more than one bitmap word, only the first word is stored on the nfs42_io_advise_res struct and all other words are ignored. Added trace point (nfs4_io_advise) for this operation: nfs4_io_advise: error=0 (OK) fileid=00:32:4217220 \ fhandle=0x4a271991 stateid=0:0x30b83748 offset=0 \ count=200 arg_hints=SEQUENTIAL res_hints=SEQUENTIAL Jorge Mora (2): NFS: add IO_ADVISE operation NFSv4.2 add tracepoint to IO_ADVISE fs/nfs/nfs42.h | 1 + fs/nfs/nfs42proc.c | 68 +++++++++++++++++++++++++++++++ fs/nfs/nfs42xdr.c | 84 +++++++++++++++++++++++++++++++++++++++ fs/nfs/nfs4file.c | 37 +++++++++++++++++ fs/nfs/nfs4proc.c | 1 + fs/nfs/nfs4trace.h | 75 ++++++++++++++++++++++++++++++++++ fs/nfs/nfs4xdr.c | 1 + include/linux/nfs4.h | 1 + include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 28 +++++++++++++ 10 files changed, 297 insertions(+) -- 2.31.1
