fs: support d_off in readdir for all filesystems

This is a trivial patch to set dirent.d_off in all readdir
implementations. As mentioned in readdir(3): "The  value  returned in
d_off is the same as would be returned by calling telldir(3) at the
current position in the directory stream."

Signed-off-by: Fotis Xenakis <foxen@windowslive.com>
Message-Id: <VI1PR03MB377326C560EA102C1B02EB4BA67C9@VI1PR03MB3773.eurprd03.prod.outlook.com>

bsd/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c

@@ -1269,7 +1269,7 @@ zfs_lookup(struct vnode *dvp, char *nm, struct vnode **vpp)
 
 	ASSERT0(!(nm[0] == '.' && nm[1] == '\0'));
 	ASSERT0(!(nm[0] == '.' && nm[1] == '.' && nm[2] == '\0'));
-	
+
 	ZFS_ENTER(zfsvfs);
 	ZFS_VERIFY_ZP(dzp);
 
@@ -1974,6 +1974,7 @@ zfs_readdir(struct vnode *dvp, struct file *fp, struct dirent *dir)
 	} else {
 		file_setoffset(fp, file_offset(fp) + 1);
 	}
+    dir->d_off = file_offset(fp);
 
 	zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
 
@@ -4714,7 +4715,7 @@ zfs_getpages(struct vnode *vp, vm_page_t *m, int count, int reqpage)
  * FreeBSD's extended attributes namespace defines file name prefix for ZFS'
  * extended attribute name:
  *
- *	NAMESPACE	PREFIX	
+ *	NAMESPACE	PREFIX
  *	system		freebsd:system:
  *	user		(none, can be used to access ZFS fsattr(5) attributes
  *			created on Solaris)

fs/devfs/devfs_vnops.cc

@@ -198,6 +198,8 @@ devfs_readdir(struct vnode *vp, struct file *fp, struct dirent *dir)
 
 	DPRINTF(("devfs_readdir: %s\n", dir->d_name));
 	fp->f_offset++;
+    dir->d_off = fp->f_offset;
+
 	return 0;
 }
 

fs/pseudofs/pseudofs.cc

@@ -168,6 +168,7 @@ int readdir(vnode *vp, file *fp, dirent *dir) {
     dir->d_fileno = fp->f_offset;
 
     fp->f_offset++;
+    dir->d_off = fp->f_offset;
 
     return 0;
 }

fs/ramfs/ramfs_vnops.cc

@@ -669,6 +669,7 @@ ramfs_readdir(struct vnode *vp, struct file *fp, struct dirent *dir)
 //	dir->d_namelen = strlen(dir->d_name);
 
     fp->f_offset++;
+    dir->d_off = fp->f_offset;
 
     mutex_unlock(&ramfs_lock);
     return 0;

fs/rofs/rofs_vnops.cc

@@ -205,6 +205,7 @@ static int rofs_readdir(struct vnode *vnode, struct file *fp, struct dirent *dir
     }
 
     fp->f_offset++;
+    dir->d_off = fp->f_offset;
 
     return 0;
 }

modules/nfs/nfs_vnops.cc

@@ -259,13 +259,13 @@ static int nfs_op_readdir(struct vnode *vp, struct file *fp, struct dirent *dir)
     // Fill dirent infos
     assert(sizeof(ino_t) == sizeof(nfsdirent->inode));
     dir->d_ino = nfsdirent->inode;
-    // FIXME: not filling dir->d_off
     // FIXME: not filling dir->d_reclen
     dir->d_type = IFTODT(nfsdirent->mode & S_IFMT);
     strlcpy((char *) &dir->d_name, nfsdirent->name, sizeof(dir->d_name));
 
     // iterate
     fp->f_offset++;
+    dir->d_off = fp->f_offset;
 
     return 0;
 }