dosfs: Add statvfs() support

4 files changed, 80 insertions, 2 deletions

diff --git a/cpukit/libfs/Makefile.am b/cpukit/libfs/Makefile.am
index 7535b5a3a6..0828da8515 100644
--- a/cpukit/libfs/Makefile.am
+++ b/cpukit/libfs/Makefile.am
@@ -80,7 +80,7 @@ libdosfs_a_SOURCES += src/dosfs/msdos_create.c src/dosfs/msdos_dir.c \
     src/dosfs/msdos_handlers_file.c src/dosfs/msdos_init.c \
     src/dosfs/msdos_initsupp.c src/dosfs/msdos_misc.c \
     src/dosfs/msdos_mknod.c src/dosfs/msdos_node_type.c \
-    src/dosfs/msdos_rmnod.c \
+    src/dosfs/msdos_rmnod.c src/dosfs/msdos_statvfs.c \
     src/dosfs/msdos_conv.c src/dosfs/msdos.h src/dosfs/msdos_format.c \
     src/dosfs/dosfs.h src/dosfs/msdos_rename.c
 endif
diff --git a/cpukit/libfs/src/dosfs/msdos.h b/cpukit/libfs/src/dosfs/msdos.h
index 9465d268d7..78eda9b226 100644
--- a/cpukit/libfs/src/dosfs/msdos.h
+++ b/cpukit/libfs/src/dosfs/msdos.h
@@ -293,6 +293,9 @@ int msdos_rename(
   size_t new_namelen
 );
 
+int msdos_statvfs(const rtems_filesystem_location_info_t *root_loc,
+  struct statvfs *sb);
+
 void msdos_lock(const rtems_filesystem_mount_table_entry_t *mt_entry);
 
 void msdos_unlock(const rtems_filesystem_mount_table_entry_t *mt_entry);
diff --git a/cpukit/libfs/src/dosfs/msdos_init.c b/cpukit/libfs/src/dosfs/msdos_init.c
index eb46141503..e82e3f52d2 100644
--- a/cpukit/libfs/src/dosfs/msdos_init.c
+++ b/cpukit/libfs/src/dosfs/msdos_init.c
@@ -53,7 +53,7 @@ const rtems_filesystem_operations_table  msdos_ops = {
   .symlink_h      =  rtems_filesystem_default_symlink,
   .readlink_h     =  rtems_filesystem_default_readlink,
   .rename_h       =  msdos_rename,
-  .statvfs_h      =  rtems_filesystem_default_statvfs
+  .statvfs_h      =  msdos_statvfs
 };
 
 void msdos_lock(const rtems_filesystem_mount_table_entry_t *mt_entry)
diff --git a/cpukit/libfs/src/dosfs/msdos_statvfs.c b/cpukit/libfs/src/dosfs/msdos_statvfs.c
new file mode 100644
index 0000000000..1a1d974fc3
--- /dev/null
+++ b/cpukit/libfs/src/dosfs/msdos_statvfs.c
@@ -0,0 +1,75 @@
+/**
+ * @file msdos_statvfs.c
+ *
+ * @brief Obtain MS-DOS filesystem information
+ * @ingroup libfs_msdos MSDOS FileSystem
+ */
+
+/*
+ *  Copyright (c) 2013 Andrey Mozzhuhin
+ *  Copyright (c) 2013 Vitaly Belov
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ */
+
+#include "fat.h"
+#include "fat_fat_operations.h"
+#include "msdos.h"
+
+int msdos_statvfs(const rtems_filesystem_location_info_t *root_loc,
+    struct statvfs *sb)
+{
+  msdos_fs_info_t *fs_info = root_loc->mt_entry->fs_info;
+  fat_vol_t *vol = &fs_info->fat.vol;
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
+                              MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
+  if (sc != RTEMS_SUCCESSFUL)
+      rtems_set_errno_and_return_minus_one(EIO);
+
+  sb->f_bsize = FAT_SECTOR512_SIZE;
+  sb->f_frsize = vol->bpc;
+  sb->f_blocks = vol->data_cls;
+  sb->f_bfree = 0;
+  sb->f_bavail = 0;
+  sb->f_files = 0;    // FAT doesn't store inodes
+  sb->f_ffree = 0;
+  sb->f_favail = 0;
+  sb->f_flag = 0;
+  sb->f_namemax = MSDOS_NAME_MAX_LNF_LEN;
+
+  if (vol->free_cls == FAT_UNDEFINED_VALUE)
+  {
+    int rc;
+    uint32_t cur_cl = 2;
+    uint32_t value = 0;
+    uint32_t data_cls_val = vol->data_cls + 2;
+
+    for (; cur_cl < data_cls_val; ++cur_cl)
+    {
+      rc = fat_get_fat_cluster(&fs_info->fat, cur_cl, &value);
+      if (rc != RC_OK)
+      {
+        rtems_semaphore_release(fs_info->vol_sema);
+        return rc;
+      }
+
+      if (value == FAT_GENFAT_FREE)
+      {
+        sb->f_bfree++;
+        sb->f_bavail++;
+      }
+    }
+  }
+  else
+  {
+    sb->f_bfree = vol->free_cls;
+    sb->f_bavail = vol->free_cls;
+  }
+
+  rtems_semaphore_release(fs_info->vol_sema);
+  return RC_OK;
+}