JFS: Fix i_blocks accounting when allocation fails

A failure in dbAlloc caused a directory's i_blocks to be incorrectly
incremented, causing jfs_fsck to find the inode to be corrupt.
Signed-off-by: NDave Kleikamp <shaggy@austin.ibm.com>

fs/jfs/jfs_dtree.c

@@ -381,9 +381,12 @@ static u32 add_index(tid_t tid, struct inode *ip, s64 bn, int slot)
 		 * It's time to move the inline table to an external
 		 * page and begin to build the xtree
 		 */
-		if (DQUOT_ALLOC_BLOCK(ip, sbi->nbperpage) ||
-		    dbAlloc(ip, 0, sbi->nbperpage, &xaddr))
-			goto clean_up;	/* No space */
+		if (DQUOT_ALLOC_BLOCK(ip, sbi->nbperpage))
+			goto clean_up;
+		if (dbAlloc(ip, 0, sbi->nbperpage, &xaddr)) {
+			DQUOT_FREE_BLOCK(ip, sbi->nbperpage);
+			goto clean_up;
+		}
 
 		/*
 		 * Save the table, we're going to overwrite it with the
@@ -397,13 +400,15 @@ static u32 add_index(tid_t tid, struct inode *ip, s64 bn, int slot)
 		xtInitRoot(tid, ip);
 
 		/*
-		 * Allocate the first block & add it to the xtree
+		 * Add the first block to the xtree
 		 */
 		if (xtInsert(tid, ip, 0, 0, sbi->nbperpage, &xaddr, 0)) {
 			/* This really shouldn't fail */
 			jfs_warn("add_index: xtInsert failed!");
 			memcpy(&jfs_ip->i_dirtable, temp_table,
 			       sizeof (temp_table));
+			dbFree(ip, xaddr, sbi->nbperpage);
+			DQUOT_FREE_BLOCK(ip, sbi->nbperpage);
 			goto clean_up;
 		}
 		ip->i_size = PSIZE;