[PATCH 4/4] statx: AFS: Return enhanced file attributes

[David Howells]

Return enhanced file attributes from the AFS filesystem.  This includes the
following:

 (1) The data version number as st_version, setting STATX_VERSION.

 (2) STATX_ATTR_AUTOMOUNT will be set on automount directories by virtue of
     S_AUTOMOUNT being set on the inode.  These are referrals to other
     volumes or other cells.

 (3) STATX_ATTR_UNLISTED_DENTS on a directory that does cell lookup for
     non-existent names and mounts them (typically mounted on /afs with -o
     autocell).  The resulting directories are marked STATX_ATTR_FABRICATED
     as they do not actually exist in the mounted AFS directory.

 (4) Files, directories and symlinks accessed over AFS are marked
     STATX_ATTR_REMOTE.

STATX_ATIME, STATX_CTIME and STATX_BLOCKS are cleared as AFS does not
support them.

Example output:

        [root@andromeda ~]# ./samples/statx/test-statx /afs
        statx(/afs) = 0
        results=7ef
          Size: 2048            Blocks: 0          IO Block: 4096    directory
        Device: 00:25           Inode: 1           Links: 2
        Access: (0777/drwxrwxrwx)  Uid:     0   Gid:     0
        Access: 2006-05-07 00:21:15.000000000+0100
        Modify: 2006-05-07 00:21:15.000000000+0100
        Change: 2006-05-07 00:21:15.000000000+0100
        IO-blocksize: blksize=4096

Signed-off-by: David Howells <dhowe...@redhat.com>
---

 fs/afs/inode.c |   21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 86cc7264c21c..b08c405a7e1b 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -72,9 +72,9 @@ static int afs_inode_map_status(struct afs_vnode *vnode, 
struct key *key)
        inode->i_uid            = vnode->status.owner;
        inode->i_gid            = GLOBAL_ROOT_GID;
        inode->i_size           = vnode->status.size;
-       inode->i_ctime.tv_sec   = vnode->status.mtime_server;
-       inode->i_ctime.tv_nsec  = 0;
-       inode->i_atime          = inode->i_mtime = inode->i_ctime;
+       inode->i_mtime.tv_sec   = vnode->status.mtime_server;
+       inode->i_mtime.tv_nsec  = 0;
+       inode->i_atime          = inode->i_ctime = inode->i_mtime;
        inode->i_blocks         = 0;
        inode->i_generation     = vnode->fid.unique;
        inode->i_version        = vnode->status.data_version;
@@ -375,8 +375,7 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
 /*
  * read the attributes of an inode
  */
-int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
-                     struct kstat *stat)
+int afs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat 
*stat)
 {
        struct inode *inode;
 
@@ -385,6 +384,18 @@ int afs_getattr(struct vfsmount *mnt, struct dentry 
*dentry,
        _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
 
        generic_fillattr(inode, stat);
+
+       stat->result_mask &= ~(STATX_ATIME | STATX_CTIME | STATX_BLOCKS);
+       stat->result_mask |= STATX_VERSION;
+       stat->version = inode->i_version;
+
+       if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags))
+               stat->attributes |= STATX_ATTR_UNLISTED_DENTS;
+
+       if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
+               stat->attributes |= STATX_ATTR_FABRICATED;
+       else
+               stat->attributes |= STATX_ATTR_REMOTE;
        return 0;
 }