NFS: Request fh_expire_type attribute in "server caps" operation
The fh_expire_type file attribute is a filesystem wide attribute that
consists of flags that indicate what characteristics file handles
on this FSID have.
Our client doesn't support volatile file handles. It should find
out early (say, at mount time) whether the server is going to play
shenanighans with file handles during a migration.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 281c2de..87b9b91 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2220,6 +2220,7 @@
server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
server->acl_bitmask = res.acl_bitmask;
+ server->fh_expire_type = res.fh_expire_type;
}
return status;
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index a6fb55d..3e0fe9f 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -2676,6 +2676,7 @@
encode_sequence(xdr, &args->seq_args, &hdr);
encode_putfh(xdr, args->fhandle, &hdr);
encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
+ FATTR4_WORD0_FH_EXPIRE_TYPE|
FATTR4_WORD0_LINK_SUPPORT|
FATTR4_WORD0_SYMLINK_SUPPORT|
FATTR4_WORD0_ACLSUPPORT, &hdr);
@@ -3223,6 +3224,28 @@
return -EIO;
}
+static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
+ uint32_t *bitmap, uint32_t *type)
+{
+ __be32 *p;
+
+ *type = 0;
+ if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
+ return -EIO;
+ if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ goto out_overflow;
+ *type = be32_to_cpup(p);
+ bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
+ }
+ dprintk("%s: expire type=0x%x\n", __func__, *type);
+ return 0;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
{
__be32 *p;
@@ -4271,6 +4294,9 @@
goto xdr_error;
if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
goto xdr_error;
+ if ((status = decode_attr_fh_expire_type(xdr, bitmap,
+ &res->fh_expire_type)) != 0)
+ goto xdr_error;
if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
goto xdr_error;
if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 03d0b91..7073fc7 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -148,6 +148,9 @@
u32 acl_bitmask; /* V4 bitmask representing the ACEs
that are supported on this
filesystem */
+ u32 fh_expire_type; /* V4 bitmask representing file
+ handle volatility type for
+ this filesystem */
struct pnfs_layoutdriver_type *pnfs_curr_ld; /* Active layout driver */
struct rpc_wait_queue roc_rpcwaitq;
void *pnfs_ld_data; /* per mount point data */
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 210da5d..6f4c359 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -977,6 +977,7 @@
u32 acl_bitmask;
u32 has_links;
u32 has_symlinks;
+ u32 fh_expire_type;
struct nfs4_sequence_res seq_res;
};