ea: query each superblock for named attr support

adds a new function nfs41_superblock_getattr(), which adds an OPENATTR call with createdir=0 after the GETATTR to check for named attribute support.  OPENATTR will either return ERR_NOTSUPP if not supported, or OK/ERR_NOENT depending on whether named attributes are present on the given file.  we can't query for the 'named_attr' attribute, because it only tells us whether the given file contains named attributes

if named attributes are supported on a superblock, it will return FILE_SUPPORTS_EXTENDED_ATTRIBUTES for associated volume queries

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>

daemon/nfs41.h

@@ -49,6 +49,7 @@ typedef struct __nfs41_superblock {
     unsigned int cansettime : 1;
     unsigned int link_support : 1;
     unsigned int symlink_support : 1;
+    unsigned int ea_support : 1;
     unsigned int case_preserving : 1;
     unsigned int case_insensitive : 1;
 

daemon/nfs41_ops.c

@@ -1135,6 +1135,72 @@ out:
     return status;
 }
 
+int nfs41_superblock_getattr(
+    IN nfs41_session *session,
+    IN nfs41_path_fh *file,
+    IN bitmap4 *attr_request,
+    OUT nfs41_file_info *info,
+    OUT bool_t *supports_named_attrs)
+{
+    int status;
+    nfs41_compound compound;
+    nfs_argop4 argops[4];
+    nfs_resop4 resops[4];
+    nfs41_sequence_args sequence_args;
+    nfs41_sequence_res sequence_res;
+    nfs41_putfh_args putfh_args;
+    nfs41_putfh_res putfh_res;
+    nfs41_getattr_args getattr_args;
+    nfs41_getattr_res getattr_res;
+    nfs41_openattr_args openattr_args;
+    nfs41_openattr_res openattr_res;
+
+    compound_init(&compound, argops, resops, "getfsattr");
+
+    compound_add_op(&compound, OP_SEQUENCE, &sequence_args, &sequence_res);
+    status = nfs41_session_sequence(&sequence_args, session, 0);
+    if (status)
+        goto out;
+
+    compound_add_op(&compound, OP_PUTFH, &putfh_args, &putfh_res);
+    putfh_args.file = file;
+    putfh_args.in_recovery = 0;
+
+    compound_add_op(&compound, OP_GETATTR, &getattr_args, &getattr_res);
+    getattr_args.attr_request = attr_request;
+    getattr_res.obj_attributes.attr_vals_len = NFS4_OPAQUE_LIMIT;
+    getattr_res.info = info;
+
+    compound_add_op(&compound, OP_OPENATTR, &openattr_args, &openattr_res);
+    openattr_args.createdir = 0;
+
+    status = compound_encode_send_decode(session, &compound, TRUE);
+    if (status)
+        goto out;
+
+    status = sequence_res.sr_status;
+    if (status) goto out;
+    status = putfh_res.status;
+    if (status) goto out;
+    status = getattr_res.status;
+    if (status) goto out;
+
+    switch (status = openattr_res.status) {
+    case NFS4ERR_NOTSUPP:
+        *supports_named_attrs = 0;
+        status = NFS4_OK;
+        break;
+
+    case NFS4ERR_NOENT:
+    case NFS4_OK:
+        *supports_named_attrs = 1;
+        status = NFS4_OK;
+        break;
+    }
+out:
+    return status;
+}
+
 int nfs41_remove(
     IN nfs41_session *session,
     IN nfs41_path_fh *parent,

daemon/nfs41_ops.h

@@ -1129,6 +1129,13 @@ int nfs41_getattr(
     IN bitmap4 *attr_request,
     OUT nfs41_file_info *info);
 
+int nfs41_superblock_getattr(
+    IN nfs41_session *session,
+    IN nfs41_path_fh *file,
+    IN bitmap4 *attr_request,
+    OUT nfs41_file_info *info,
+    OUT bool_t *supports_named_attrs);
+
 /* getattr.c */
 int nfs41_cached_getattr(
     IN nfs41_session *session,

daemon/nfs41_superblock.c

@@ -75,6 +75,7 @@ static int get_superblock_attrs(
     IN nfs41_superblock *superblock,
     IN nfs41_path_fh *file)
 {
+    bool_t supports_named_attrs;
     int status;
     bitmap4 attr_request;
     nfs41_file_info info = { 0 };
@@ -93,10 +94,11 @@ static int get_superblock_attrs(
     info.suppattr_exclcreat = &superblock->suppattr_exclcreat;
     info.time_delta = &superblock->time_delta;
 
-    status = nfs41_getattr(session, file, &attr_request, &info);
+    status = nfs41_superblock_getattr(session, file,
+        &attr_request, &info, &supports_named_attrs);
     if (status) {
-        eprintf("nfs41_getattr() failed with %s when fetching attributes for "
-            "fsid(%llu,%llu)\n", nfs_error_string(status),
+        eprintf("nfs41_superblock_getattr() failed with %s when fetching "
+            "attributes for fsid(%llu,%llu)\n", nfs_error_string(status),
             superblock->fsid.major, superblock->fsid.minor);
         goto out;
     }
@@ -115,6 +117,7 @@ static int get_superblock_attrs(
     superblock->aclsupport = info.aclsupport;
     superblock->link_support = info.link_support;
     superblock->symlink_support = info.symlink_support;
+    superblock->ea_support = supports_named_attrs;
     superblock->case_preserving = info.case_preserving;
     superblock->case_insensitive = info.case_insensitive;
 

daemon/volume.c

@@ -124,6 +124,8 @@ static void handle_volume_attributes(
         attr->FileSystemAttributes |= FILE_SUPPORTS_HARD_LINKS;
     if (superblock->symlink_support)
         attr->FileSystemAttributes |= FILE_SUPPORTS_REPARSE_POINTS;
+    if (superblock->ea_support)
+        attr->FileSystemAttributes |= FILE_SUPPORTS_EXTENDED_ATTRIBUTES;
     if (superblock->case_preserving)
         attr->FileSystemAttributes |= FILE_CASE_PRESERVED_NAMES;
     if (!superblock->case_insensitive)