nfs: get clone_blksize when probing fsinfo

NFSv42 CLONE operation is supposed to respect it.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

3 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index c0c695b634d0..e7e78537aea2 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -422,6 +422,7 @@ enum lock_type4 {
 #define FATTR4_WORD2_LAYOUT_TYPES       (1UL << 0)
 #define FATTR4_WORD2_LAYOUT_BLKSIZE     (1UL << 1)
 #define FATTR4_WORD2_MDSTHRESHOLD       (1UL << 4)
+#define FATTR4_WORD2_CLONE_BLKSIZE      (1UL << 13)
 #define FATTR4_WORD2_SECURITY_LABEL     (1UL << 16)
 
 /* MDS threshold bitmap bits */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index a50de1002b20..2469ab0bb3a1 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -147,6 +147,7 @@ struct nfs_server {
         unsigned int            acdirmax;
         unsigned int            namelen;
         unsigned int            options;        /* extra options enabled by mount */
+        unsigned int            clone_blksize;  /* granularity of a CLONE operation */
 #define NFS_OPTION_FSCACHE      0x00000001      /* - local caching enabled */
 #define NFS_OPTION_MIGRATION    0x00000002      /* - NFSv4 migration enabled */
 
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index ac678b7a65ed..92ff445e60a0 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -141,6 +141,7 @@ struct nfs_fsinfo {
         __u32                   lease_time; /* in seconds */
         __u32                   layouttype; /* supported pnfs layout driver */
         __u32                   blksize; /* preferred pnfs io block size */
+        __u32                   clone_blksize; /* granularity of a CLONE operation */
 };
 
 struct nfs_fsstat {