[Cluster-devel] [PATCH 08/11] gfs2: Move inode generation number check into gfs2_inode_lookup

[Andreas Gruenbacher <agruenba@redhat.com>]

Move the inode generation number check from gfs2_lookup_by_inum into
gfs2_inode_lookup: gfs2_inode_lookup may be able to decide that an inode with
the given inode generation number cannot exist without having to verify the
block type or reading the inode from disk.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/gfs2/inode.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 41fc23710529..e12e694a1bbb 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -114,6 +114,10 @@ static void gfs2_set_iop(struct inode *inode)
  * placeholder because it doesn't otherwise make sense), the on-disk block type
  * is verified to be @blktype.
  *
+ * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
+ * if it detects that @no_formal_ino doesn't match the actual inode generation
+ * number.  However, it doesn't always know unless @type is DT_UNKNOWN.
+ *
  * Returns: A VFS inode, or an error
  */
 
@@ -158,6 +162,11 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 			if (error)
 				goto fail_put;
 
+			error = -ESTALE;
+			if (no_formal_ino &&
+			    gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
+				goto fail_put;
+
 			if (blktype != GFS2_BLKST_FREE) {
 				error = gfs2_check_blk_type(sdp, no_addr,
 							    blktype);
@@ -189,9 +198,15 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 		/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
 		inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
 		inode->i_atime.tv_nsec = 0;
+	}
 
+	error = -ESTALE;
+	if (no_formal_ino && ip->i_no_formal_ino &&
+	    no_formal_ino != ip->i_no_formal_ino)
+		goto fail_refresh;
+
+	if (inode->i_state & I_NEW)
 		unlock_new_inode(inode);
-	}
 
 	if (gfs2_holder_initialized(&i_gh))
 		gfs2_glock_dq_uninit(&i_gh);
@@ -226,16 +241,12 @@ struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 	struct inode *inode;
 	int error;
 
-	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
+	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
+				  blktype);
 	if (IS_ERR(inode))
 		return inode;
 
-	/* Two extra checks for NFS only */
 	if (no_formal_ino) {
-		error = -ESTALE;
-		if (GFS2_I(inode)->i_no_formal_ino != no_formal_ino)
-			goto fail_iput;
-
 		error = -EIO;
 		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
 			goto fail_iput;
-- 
2.20.1