exofs: statfs blocks is sectors not FS blocks

Even though exofs has a 4k block size, statfs blocks
is in sectors (512 bytes).

Also if target returns 0 for capacity then make it
ULLONG_MAX. df does not like zero-size filesystems

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 920f016..28add3e 100644 (file)
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -473,9 +473,11 @@ static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
                goto out;
 
        ret = extract_attr_from_req(or, &attrs[0]);
-       if (likely(!ret))
+       if (likely(!ret)) {
                capacity = get_unaligned_be64(attrs[0].val_ptr);
-       else
+               if (unlikely(!capacity))
+                       capacity = ULLONG_MAX;
+       } else
                EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
 
        ret = extract_attr_from_req(or, &attrs[1]);
@@ -487,8 +489,8 @@ static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
        /* fill in the stats buffer */
        buf->f_type = EXOFS_SUPER_MAGIC;
        buf->f_bsize = EXOFS_BLKSIZE;
-       buf->f_blocks = (capacity >> EXOFS_BLKSHIFT);
-       buf->f_bfree = ((capacity - used) >> EXOFS_BLKSHIFT);
+       buf->f_blocks = capacity >> 9;
+       buf->f_bfree = (capacity - used) >> 9;
        buf->f_bavail = buf->f_bfree;
        buf->f_files = sbi->s_numfiles;
        buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;