diff --git a/daemon/nfs41.h b/daemon/nfs41.h
index c4280e0..057488f 100644
--- a/daemon/nfs41.h
+++ b/daemon/nfs41.h
@@ -39,11 +39,23 @@ typedef struct __nfs41_superblock {
     nfstime4 time_delta;
     uint64_t maxread;
     uint64_t maxwrite;
-    uint32_t layout_types;
-    bool_t cansettime;
-    uint32_t aclsupport;
     struct list_entry entry; /* position in nfs41_server.superblocks */
 
+    /* constant filesystem attributes */
+    unsigned int layout_types : 3;
+    unsigned int aclsupport : 3;
+    unsigned int cansettime : 1;
+    unsigned int link_support : 1;
+    unsigned int symlink_support : 1;
+    unsigned int case_preserving : 1;
+    unsigned int case_insensitive : 1;
+
+    /* variable filesystem attributes */
+    uint64_t space_avail;
+    uint64_t space_free;
+    uint64_t space_total;
+    time_t cache_expiration; /* applies to space_ attributes */
+
     SRWLOCK lock;
 } nfs41_superblock;
 
@@ -375,6 +387,9 @@ int nfs41_superblock_for_fh(
     IN const nfs41_fh *parent OPTIONAL,
     OUT nfs41_path_fh *file);
 
+void nfs41_superblock_space_changed(
+    IN nfs41_superblock *superblock);
+
 void nfs41_superblock_list_init(
     IN nfs41_superblock_list *superblocks);
 
diff --git a/daemon/nfs41_ops.c b/daemon/nfs41_ops.c
index 46c3f06..0039631 100644
--- a/daemon/nfs41_ops.c
+++ b/daemon/nfs41_ops.c
@@ -426,6 +426,9 @@ int nfs41_open(
             &open_res.resok4.deleg_stateid);
     }
 #endif
+
+    if (create == OPEN4_CREATE)
+        nfs41_superblock_space_changed(state->file.fh.superblock);
 out:
     return status;
 }
@@ -607,6 +610,8 @@ int nfs41_create(
         file->path->path, &file->name, &file->fh,
         &file_info, &create_res.cinfo);
     ReleaseSRWLockShared(&file->path->lock);
+
+    nfs41_superblock_space_changed(file->fh.superblock);
 out:
     return status;
 }
@@ -749,6 +754,7 @@ int nfs41_write(
         eprintf("WRITE succeeded with count=0; returning %s\n",
             nfs_error_string(status));
     }
+    nfs41_superblock_space_changed(file->fh.superblock);
 out:
     return status;
 }
@@ -875,6 +881,7 @@ int nfs41_commit(
         nfs41_attr_cache_update(session_name_cache(session),
             file->fh.fileid, &info);
     }
+    nfs41_superblock_space_changed(file->fh.superblock);
 out:
     return status;
 }
@@ -1170,6 +1177,8 @@ int nfs41_remove(
     nfs41_name_cache_remove(session_name_cache(session),
         parent->path->path, target, &remove_res.cinfo);
     ReleaseSRWLockShared(&parent->path->lock);
+
+    nfs41_superblock_space_changed(parent->fh.superblock);
 out:
     return status;
 }
@@ -1322,6 +1331,9 @@ int nfs41_setattr(
     memcpy(&info->attrmask, &setattr_res.attrsset, sizeof(bitmap4));
     nfs41_attr_cache_update(session_name_cache(session),
         file->fh.fileid, info);
+
+    if (setattr_res.attrsset.arr[0] & FATTR4_WORD0_SIZE)
+        nfs41_superblock_space_changed(file->fh.superblock);
 out:
     return status;
 }
@@ -1430,6 +1442,8 @@ int nfs41_link(
         dst_dir->path->path, target, &link_out->fh,
         &info[1], &link_res.cinfo);
     ReleaseSRWLockShared(&dst_dir->path->lock);
+
+    nfs41_superblock_space_changed(dst_dir->fh.superblock);
 out:
     return status;
 }
diff --git a/daemon/nfs41_superblock.c b/daemon/nfs41_superblock.c
index 80fdcfe..d09c361 100644
--- a/daemon/nfs41_superblock.c
+++ b/daemon/nfs41_superblock.c
@@ -82,8 +82,10 @@ static int get_superblock_attrs(
     nfs41_file_info info;
 
     attr_request.arr[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
-        FATTR4_WORD0_CANSETTIME | FATTR4_WORD0_MAXREAD |
-        (uint32_t)(FATTR4_WORD0_MAXWRITE) | FATTR4_WORD0_ACLSUPPORT;
+        FATTR4_WORD0_LINK_SUPPORT | FATTR4_WORD0_SYMLINK_SUPPORT |
+        FATTR4_WORD0_ACLSUPPORT | FATTR4_WORD0_CANSETTIME |
+        FATTR4_WORD0_CASE_INSENSITIVE | FATTR4_WORD0_CASE_PRESERVING |
+        FATTR4_WORD0_MAXREAD | (uint32_t)(FATTR4_WORD0_MAXWRITE);
     attr_request.arr[1] = FATTR4_WORD1_FS_LAYOUT_TYPE |
         FATTR4_WORD1_TIME_DELTA;
     attr_request.count = 2;
@@ -112,6 +114,11 @@ static int get_superblock_attrs(
         superblock->maxwrite = session->fore_chan_attrs.ca_maxrequestsize;
 
     superblock->layout_types = info.fs_layout_types;
+    superblock->aclsupport = info.aclsupport;
+    superblock->link_support = info.link_support;
+    superblock->symlink_support = info.symlink_support;
+    superblock->case_preserving = info.case_preserving;
+    superblock->case_insensitive = info.case_insensitive;
 
     if (bitmap_isset(&info.attrmask, 0, FATTR4_WORD0_CANSETTIME))
         superblock->cansettime = info.cansettime;
@@ -122,15 +129,18 @@ static int get_superblock_attrs(
     if (!bitmap_isset(&info.attrmask, 1, FATTR4_WORD1_TIME_DELTA))
         superblock->time_delta.seconds = 1;
 
-    superblock->aclsupport = info.aclsupport;
     dprintf(SBLVL, "attributes for fsid(%llu,%llu): "
         "maxread=%llu, maxwrite=%llu, layout_types: 0x%X, "
-        "cansettime=%u, time_delta={%llu,%u}, aclsupport=%d\n",
+        "cansettime=%u, time_delta={%llu,%u}, aclsupport=%u, "
+        "link_support=%u, symlink_support=%u, case_preserving=%u, "
+        "case_insensitive=%u\n",
         superblock->fsid.major, superblock->fsid.minor,
         superblock->maxread, superblock->maxwrite,
         superblock->layout_types, superblock->cansettime,
         superblock->time_delta.seconds, superblock->time_delta.nseconds,
-        superblock->aclsupport);
+        superblock->aclsupport, superblock->link_support,
+        superblock->symlink_support, superblock->case_preserving,
+        superblock->case_insensitive);
 out:
     return status;
 }
@@ -236,3 +246,12 @@ out:
         file->fh.superblock, status);
     return status;
 }
+
+void nfs41_superblock_space_changed(
+    IN nfs41_superblock *superblock)
+{
+    /* invalidate cached volume size attributes */
+    AcquireSRWLockExclusive(&superblock->lock);
+    superblock->cache_expiration = 0;
+    ReleaseSRWLockExclusive(&superblock->lock);
+}
diff --git a/daemon/volume.c b/daemon/volume.c
index c1c7d92..aee0542 100644
--- a/daemon/volume.c
+++ b/daemon/volume.c
@@ -24,6 +24,7 @@
 #include <Windows.h>
 #include <strsafe.h>
 #include <stdio.h>
+#include <time.h>
 
 #include "nfs41_ops.h"
 #include "from_kernel.h"
@@ -40,6 +41,8 @@
 
 #define TO_UNITS(bytes) (bytes / BYTES_PER_UNIT)
 
+#define VOLUME_CACHE_EXPIRATION 20
+
 
 /* NFS41_VOLUME_QUERY */
 static int parse_volume(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
@@ -63,21 +66,46 @@ static int get_volume_size_info(
     OUT OPTIONAL PLONGLONG avail_out)
 {
     nfs41_file_info info = { 0 };
-    bitmap4 attr_request = { 2, { 0, FATTR4_WORD1_SPACE_AVAIL |
-        FATTR4_WORD1_SPACE_FREE | FATTR4_WORD1_SPACE_TOTAL } };
-    int status;
+    nfs41_superblock *superblock = state->file.fh.superblock;
+    int status = ERROR_NOT_FOUND;
 
-    /* query the space_ attributes of the root filesystem */
-    status = nfs41_getattr(state->session, &state->file, &attr_request, &info);
-    if (status) {
-        eprintf("nfs41_getattr() failed with %s\n",
-            nfs_error_string(status));
-        status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
-        goto out;
+    AcquireSRWLockShared(&superblock->lock);
+    /* check superblock for cached attributes */
+    if (time(NULL) <= superblock->cache_expiration) {
+        info.space_total = superblock->space_total;
+        info.space_avail = superblock->space_avail;
+        info.space_free = superblock->space_free;
+        status = NO_ERROR;
+
+        dprintf(2, "%s cached: %llu user, %llu free of %llu total\n",
+            query, info.space_avail, info.space_free, info.space_total);
     }
+    ReleaseSRWLockShared(&superblock->lock);
 
-    dprintf(2, "%s: %llu user, %llu free of %llu total\n", query,
-        info.space_avail, info.space_free, info.space_total);
+    if (status) {
+        bitmap4 attr_request = { 2, { 0, FATTR4_WORD1_SPACE_AVAIL |
+            FATTR4_WORD1_SPACE_FREE | FATTR4_WORD1_SPACE_TOTAL } };
+
+        /* query the space_ attributes of the filesystem */
+        status = nfs41_getattr(state->session, &state->file,
+            &attr_request, &info);
+        if (status) {
+            eprintf("nfs41_getattr() failed with %s\n",
+                nfs_error_string(status));
+            status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
+            goto out;
+        }
+
+        AcquireSRWLockExclusive(&superblock->lock);
+        superblock->space_total = info.space_total;
+        superblock->space_avail = info.space_avail;
+        superblock->space_free = info.space_free;
+        superblock->cache_expiration = time(NULL) + VOLUME_CACHE_EXPIRATION;
+        ReleaseSRWLockExclusive(&superblock->lock);
+
+        dprintf(2, "%s: %llu user, %llu free of %llu total\n",
+            query, info.space_avail, info.space_free, info.space_total);
+    }
 
     if (total_out) *total_out = TO_UNITS(info.space_total);
     if (user_out) *user_out = TO_UNITS(info.space_avail);
@@ -90,32 +118,20 @@ static int handle_volume_attributes(
     IN volume_upcall_args *args,
     IN nfs41_open_state *state)
 {
-    /* query the case_ attributes of the root filesystem */
-    nfs41_file_info info = { 0 };
-    bitmap4 attr_request = { 1, { FATTR4_WORD0_CASE_INSENSITIVE |
-        FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_SYMLINK_SUPPORT |
-        FATTR4_WORD0_LINK_SUPPORT } };
     PFILE_FS_ATTRIBUTE_INFORMATION attr = &args->info.attribute;
+    const nfs41_superblock *superblock = state->file.fh.superblock;
     int status = NO_ERROR;
 
-    status = nfs41_getattr(state->session, &state->file, &attr_request, &info);
-    if (status) {
-        eprintf("nfs41_getattr() failed with %s\n",
-            nfs_error_string(status));
-        status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
-        goto out;
-    }
-
     attr->FileSystemAttributes = FILE_SUPPORTS_REMOTE_STORAGE;
-    if (info.link_support)
+    if (superblock->link_support)
         attr->FileSystemAttributes |= FILE_SUPPORTS_HARD_LINKS;
-    if (info.symlink_support)
+    if (superblock->symlink_support)
         attr->FileSystemAttributes |= FILE_SUPPORTS_REPARSE_POINTS;
-    if (info.case_preserving)
+    if (superblock->case_preserving)
         attr->FileSystemAttributes |= FILE_CASE_PRESERVED_NAMES;
-    if (!info.case_insensitive)
+    if (!superblock->case_insensitive)
         attr->FileSystemAttributes |= FILE_CASE_SENSITIVE_SEARCH;
-    if (state->file.fh.superblock->aclsupport)
+    if (superblock->aclsupport)
         attr->FileSystemAttributes |= FILE_PERSISTENT_ACLS;
 
     attr->MaximumComponentNameLength = NFS41_MAX_COMPONENT_LEN;
@@ -126,9 +142,9 @@ static int handle_volume_attributes(
 
     dprintf(2, "FileFsAttributeInformation: case_preserving %u, "
         "case_insensitive %u, max component %u\n",
-        info.case_preserving, info.case_insensitive,
+        superblock->case_preserving, superblock->case_insensitive,
         attr->MaximumComponentNameLength);
-out:
+
     return status;
 }