jfs: return f_fsid for statfs(2)

This patch makes jfs return f_fsid info for statfs(2). By Andreas'
suggestion, this patch populates a persistent f_fsid between boots/mounts
with help of on-disk uuid record.

Signed-off-by: Coly Li <coly.li@suse.de>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 0dae345e481b..59e07c10319d 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -29,6 +29,7 @@
 #include <linux/posix_acl.h>
 #include <linux/buffer_head.h>
 #include <linux/exportfs.h>
+#include <linux/crc32.h>
 #include <asm/uaccess.h>
 #include <linux/seq_file.h>
 
@@ -168,6 +169,9 @@ static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_files = maxinodes;
         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
                                     atomic_read(&imap->im_numfree));
+        buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
+        buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
+                                        sizeof(sbi->uuid)/2);
 
         buf->f_namelen = JFS_NAME_MAX;
         return 0;