AFS: implement statfs

Implement the statfs() op for AFS.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 36 insertions, 5 deletions

diff --git a/fs/afs/super.c b/fs/afs/super.c
index 422f532b9b62..579af632c8e8 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -21,22 +21,20 @@
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 #include <linux/parser.h>
+#include <linux/statfs.h>
 #include "internal.h"
 
 #define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
 
 static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
                             unsigned long flags);
-
 static int afs_get_sb(struct file_system_type *fs_type,
                       int flags, const char *dev_name,
                       void *data, struct vfsmount *mnt);
-
 static struct inode *afs_alloc_inode(struct super_block *sb);
-
 static void afs_put_super(struct super_block *sb);
-
 static void afs_destroy_inode(struct inode *inode);
+static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
 
 struct file_system_type afs_fs_type = {
         .owner          = THIS_MODULE,
@@ -47,7 +45,7 @@ struct file_system_type afs_fs_type = {
 };
 
 static const struct super_operations afs_super_ops = {
-        .statfs         = simple_statfs,
+        .statfs         = afs_statfs,
         .alloc_inode    = afs_alloc_inode,
         .drop_inode     = generic_delete_inode,
         .write_inode    = afs_write_inode,
@@ -508,3 +506,36 @@ static void afs_destroy_inode(struct inode *inode)
         kmem_cache_free(afs_inode_cachep, vnode);
         atomic_dec(&afs_count_active_inodes);
 }
+
+/*
+ * return information about an AFS volume
+ */
+static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+        struct afs_volume_status vs;
+        struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
+        struct key *key;
+        int ret;
+
+        key = afs_request_key(vnode->volume->cell);
+        if (IS_ERR(key))
+                return PTR_ERR(key);
+
+        ret = afs_vnode_get_volume_status(vnode, key, &vs);
+        key_put(key);
+        if (ret < 0) {
+                _leave(" = %d", ret);
+                return ret;
+        }
+
+        buf->f_type     = dentry->d_sb->s_magic;
+        buf->f_bsize    = AFS_BLOCK_SIZE;
+        buf->f_namelen  = AFSNAMEMAX - 1;
+
+        if (vs.max_quota == 0)
+                buf->f_blocks = vs.part_max_blocks;
+        else
+                buf->f_blocks = vs.max_quota;
+        buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
+        return 0;
+}