[XFS] Restored xfs_iflush_all, which is still used to finish reclaims.

SGI Modid: xfs-linux:xfs-kern:174868a
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/xfs_inode.c

@@ -3580,6 +3580,108 @@ xfs_iflush_int(
 }
 
 
+/*
+ * Flush all inactive inodes in mp.  Return true if no user references
+ * were found, false otherwise.
+ */
+int
+xfs_iflush_all(
+	xfs_mount_t	*mp,
+	int		flag)
+{
+	int		busy;
+	int		done;
+	int		purged;
+	xfs_inode_t	*ip;
+	vmap_t		vmap;
+	vnode_t		*vp;
+
+	busy = done = 0;
+	while (!done) {
+		purged = 0;
+		XFS_MOUNT_ILOCK(mp);
+		ip = mp->m_inodes;
+		if (ip == NULL) {
+			break;
+		}
+		do {
+			/* Make sure we skip markers inserted by sync */
+			if (ip->i_mount == NULL) {
+				ip = ip->i_mnext;
+				continue;
+			}
+
+			/*
+			 * It's up to our caller to purge the root
+			 * and quota vnodes later.
+			 */
+			vp = XFS_ITOV_NULL(ip);
+
+			if (!vp) {
+				XFS_MOUNT_IUNLOCK(mp);
+				xfs_finish_reclaim(ip, 0, XFS_IFLUSH_ASYNC);
+				purged = 1;
+				break;
+			}
+
+			if (vn_count(vp) != 0) {
+				if (vn_count(vp) == 1 &&
+				    (ip == mp->m_rootip ||
+				     (mp->m_quotainfo &&
+				      (ip->i_ino == mp->m_sb.sb_uquotino ||
+				       ip->i_ino == mp->m_sb.sb_gquotino)))) {
+
+					ip = ip->i_mnext;
+					continue;
+				}
+				if (!(flag & XFS_FLUSH_ALL)) {
+					busy = 1;
+					done = 1;
+					break;
+				}
+				/*
+				 * Ignore busy inodes but continue flushing
+				 * others.
+				 */
+				ip = ip->i_mnext;
+				continue;
+			}
+			/*
+			 * Sample vp mapping while holding mp locked on MP
+			 * systems, so we don't purge a reclaimed or
+			 * nonexistent vnode.  We break from the loop
+			 * since we know that we modify
+			 * it by pulling ourselves from it in xfs_reclaim()
+			 * called via vn_purge() below.  Set ip to the next
+			 * entry in the list anyway so we'll know below
+			 * whether we reached the end or not.
+			 */
+			VMAP(vp, vmap);
+			XFS_MOUNT_IUNLOCK(mp);
+
+			vn_purge(vp, &vmap);
+
+			purged = 1;
+			break;
+		} while (ip != mp->m_inodes);
+		/*
+		 * We need to distinguish between when we exit the loop
+		 * after a purge and when we simply hit the end of the
+		 * list.  We can't use the (ip == mp->m_inodes) test,
+		 * because when we purge an inode at the start of the list
+		 * the next inode on the list becomes mp->m_inodes.  That
+		 * would cause such a test to bail out early.  The purged
+		 * variable tells us how we got out of the loop.
+		 */
+		if (!purged) {
+			done = 1;
+		}
+	}
+	XFS_MOUNT_IUNLOCK(mp);
+	return !busy;
+}
+
+
 /*
  * xfs_iaccess: check accessibility of inode for mode.
  */

fs/xfs/xfs_inode.h

@@ -527,6 +527,7 @@ void		xfs_ipin(xfs_inode_t *);
 void		xfs_iunpin(xfs_inode_t *);
 int		xfs_iextents_copy(xfs_inode_t *, xfs_bmbt_rec_t *, int);
 int		xfs_iflush(xfs_inode_t *, uint);
+int		xfs_iflush_all(struct xfs_mount *, int);
 int		xfs_iaccess(xfs_inode_t *, mode_t, cred_t *);
 uint		xfs_iroundup(uint);
 void		xfs_ichgtime(xfs_inode_t *, int);

fs/xfs/xfs_mount.c

@@ -1074,6 +1074,8 @@ xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
 	int64_t		fsid;
 #endif
 
+	xfs_iflush_all(mp, XFS_FLUSH_ALL);
+
 	XFS_QM_DQPURGEALL(mp,
 		XFS_QMOPT_UQUOTA | XFS_QMOPT_GQUOTA | XFS_QMOPT_UMOUNTING);