Merge git://oss.sgi.com:8090/nathans/xfs-2.6

* git://oss.sgi.com:8090/nathans/xfs-2.6:
  [XFS] Fixup whitespace damage in log_write, remove final warning.
  [XFS] Rework code snippets slightly to remove remaining recent-gcc
  [XFS] Fix realtime subvolume expansion, a porting bug b0rked it.  Coverity
  [XFS] Remove a race condition where a linked inode could BUG_ON in
  [XFS] Remove redundant directory checks from inode link operation.
  [XFS] Remove a couple of no-longer-used macros.
  [XFS] Reduce size of xfs_trans_t structure. * remove ->t_forw, ->t_back --
  [XFS] remove unused behaviour lock - shrink XFS vnode as a side effect.
  [XFS] * There is trivial "inode => vnode => inode" conversion, but only
  [XFS] link(2) on directory is banned in VFS.

fs/xfs/linux-2.6/xfs_iops.c

@@ -419,16 +419,15 @@ xfs_vn_link(
 	int		error;
 
 	ip = old_dentry->d_inode;	/* inode being linked to */
-	if (S_ISDIR(ip->i_mode))
-		return -EPERM;
-
 	tdvp = vn_from_inode(dir);
 	vp = vn_from_inode(ip);
 
+	VN_HOLD(vp);
 	error = bhv_vop_link(tdvp, vp, dentry, NULL);
-	if (likely(!error)) {
+	if (unlikely(error)) {
+		VN_RELE(vp);
+	} else {
 		VMODIFY(tdvp);
-		VN_HOLD(vp);
 		xfs_validate_fields(ip, &vattr);
 		d_instantiate(dentry, ip);
 	}

fs/xfs/linux-2.6/xfs_linux.h

@@ -140,9 +140,7 @@ BUFFER_FNS(PrivateStart, unwritten);
 #define current_pid()		(current->pid)
 #define current_fsuid(cred)	(current->fsuid)
 #define current_fsgid(cred)	(current->fsgid)
-#define current_set_flags(f)	(current->flags |= (f))
 #define current_test_flags(f)	(current->flags & (f))
-#define current_clear_flags(f)	(current->flags & ~(f))
 #define current_set_flags_nested(sp, f)		\
 		(*(sp) = current->flags, current->flags |= (f))
 #define current_clear_flags_nested(sp, f)	\

fs/xfs/linux-2.6/xfs_vnode.h

@@ -93,7 +93,7 @@ typedef enum {
  */
 static inline struct bhv_vnode *vn_from_inode(struct inode *inode)
 {
-	return (bhv_vnode_t *)list_entry(inode, bhv_vnode_t, v_inode);
+	return container_of(inode, bhv_vnode_t, v_inode);
 }
 static inline struct inode *vn_to_inode(struct bhv_vnode *vnode)
 {

fs/xfs/xfs_behavior.h

@@ -78,15 +78,12 @@
  *
  */
 
-struct bhv_head_lock;
-
 /*
  * Behavior head.  Head of the chain of behaviors.
  * Contained within each virtualized object data structure.
  */
 typedef struct bhv_head {
 	struct bhv_desc *bh_first;	/* first behavior in chain */
-	struct bhv_head_lock *bh_lockp;	/* pointer to lock info struct */
 } bhv_head_t;
 
 /*

fs/xfs/xfs_inode.c

@@ -1961,9 +1961,9 @@ xfs_iunlink_remove(
 	xfs_agino_t	agino;
 	xfs_agino_t	next_agino;
 	xfs_buf_t	*last_ibp;
-	xfs_dinode_t	*last_dip;
+	xfs_dinode_t	*last_dip = NULL;
 	short		bucket_index;
-	int		offset, last_offset;
+	int		offset, last_offset = 0;
 	int		error;
 	int		agi_ok;
 

fs/xfs/xfs_log.c

@@ -1740,10 +1740,10 @@ xlog_write(xfs_mount_t *	mp,
 	   xlog_in_core_t	**commit_iclog,
 	   uint			flags)
 {
-    xlog_t	     *log    = mp->m_log;
+    xlog_t	     *log = mp->m_log;
     xlog_ticket_t    *ticket = (xlog_ticket_t *)tic;
+    xlog_in_core_t   *iclog = NULL;  /* ptr to current in-core log */
     xlog_op_header_t *logop_head;    /* ptr to log operation header */
-    xlog_in_core_t   *iclog;	     /* ptr to current in-core log */
     __psint_t	     ptr;	     /* copy address into data region */
     int		     len;	     /* # xlog_write() bytes 2 still copy */
     int		     index;	     /* region index currently copying */

fs/xfs/xfs_log_recover.c

@@ -990,6 +990,8 @@ xlog_find_zeroed(
 	xfs_daddr_t     num_scan_bblks;
 	int	        error, log_bbnum = log->l_logBBsize;
 
+	*blk_no = 0;
+
 	/* check totally zeroed log */
 	bp = xlog_get_bp(log, 1);
 	if (!bp)

fs/xfs/xfs_mount.c

@@ -2028,7 +2028,7 @@ xfs_icsb_balance_counter(
 	xfs_sb_field_t  field,
 	int		flags)
 {
-	uint64_t	count, resid = 0;
+	uint64_t	count, resid;
 	int		weight = num_online_cpus();
 	int		s;
 
@@ -2060,6 +2060,7 @@ xfs_icsb_balance_counter(
 		break;
 	default:
 		BUG();
+		count = resid = 0;	/* quiet, gcc */
 		break;
 	}
 

fs/xfs/xfs_rtalloc.c

@@ -1929,7 +1929,7 @@ xfs_growfs_rt(
 	/*
 	 * Initial error checking.
 	 */
-	if (mp->m_rtdev_targp || mp->m_rbmip == NULL ||
+	if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL ||
 	    (nrblocks = in->newblocks) <= sbp->sb_rblocks ||
 	    (sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))
 		return XFS_ERROR(EINVAL);

fs/xfs/xfs_trans.h

@@ -338,8 +338,6 @@ typedef void (*xfs_trans_callback_t)(struct xfs_trans *, void *);
 typedef struct xfs_trans {
 	unsigned int		t_magic;	/* magic number */
 	xfs_log_callback_t	t_logcb;	/* log callback struct */
-	struct xfs_trans	*t_forw;	/* async list pointers */
-	struct xfs_trans	*t_back;	/* async list pointers */
 	unsigned int		t_type;		/* transaction type */
 	unsigned int		t_log_res;	/* amt of log space resvd */
 	unsigned int		t_log_count;	/* count for perm log res */
@@ -364,9 +362,11 @@ typedef struct xfs_trans {
 	long			t_res_fdblocks_delta; /* on-disk only chg */
 	long			t_frextents_delta;/* superblock freextents chg*/
 	long			t_res_frextents_delta; /* on-disk only chg */
+#ifdef DEBUG
 	long			t_ag_freeblks_delta; /* debugging counter */
 	long			t_ag_flist_delta; /* debugging counter */
 	long			t_ag_btree_delta; /* debugging counter */
+#endif
 	long			t_dblocks_delta;/* superblock dblocks change */
 	long			t_agcount_delta;/* superblock agcount change */
 	long			t_imaxpct_delta;/* superblock imaxpct change */

fs/xfs/xfs_vnodeops.c

@@ -2603,8 +2603,7 @@ xfs_link(
 	vn_trace_entry(src_vp, __FUNCTION__, (inst_t *)__return_address);
 
 	target_namelen = VNAMELEN(dentry);
-	if (VN_ISDIR(src_vp))
-		return XFS_ERROR(EPERM);
+	ASSERT(!VN_ISDIR(src_vp));
 
 	sip = xfs_vtoi(src_vp);
 	tdp = XFS_BHVTOI(target_dir_bdp);
@@ -2699,9 +2698,8 @@ xfs_link(
 	xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
 
 	error = xfs_bumplink(tp, sip);
-	if (error) {
+	if (error)
 		goto abort_return;
-	}
 
 	/*
 	 * If this is a synchronous mount, make sure that the
@@ -2719,9 +2717,8 @@ xfs_link(
 	}
 
 	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
-	if (error) {
+	if (error)
 		goto std_return;
-	}
 
 	/* Fall through to std_return with error = 0. */
 std_return:
@@ -2742,6 +2739,8 @@ xfs_link(
 	xfs_trans_cancel(tp, cancel_flags);
 	goto std_return;
 }
+
+
 /*
  * xfs_mkdir
  *