Ext3: return ENOMEM rather than EIO if sb_getblk fails

It will be better to use ENOMEM rather than EIO, because the only
reason that sb_getblk fails is that allocation fails.

Signed-off-by: Wang Shilong <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

fs/ext3/inode.c

···
 		struct buffer_head *bh;
 		bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 		if (unlikely(!bh)) {
-			*errp = -EIO;
+			*errp = -ENOMEM;
 			goto err;
 		}
 		if (buffer_new(&dummy)) {
···
 				"unable to read inode block - "
 				"inode=%lu, block="E3FSBLK,
 				 inode->i_ino, block);
-		return -EIO;
+		return -ENOMEM;
 	}
 	if (!buffer_uptodate(bh)) {
 		lock_buffer(bh);

fs/ext3/resize.c

···
 
 	bh = sb_getblk(sb, blk);
 	if (unlikely(!bh))
-		return ERR_PTR(-EIO);
+		return ERR_PTR(-ENOMEM);
 	if ((err = ext3_journal_get_write_access(handle, bh))) {
 		brelse(bh);
 		bh = ERR_PTR(err);
···
 
 		gdb = sb_getblk(sb, block);
 		if (unlikely(!gdb)) {
-			err = -EIO;
+			err = -ENOMEM;
 			goto exit_bh;
 		}
 		if ((err = ext3_journal_get_write_access(handle, gdb))) {
···
 
 		bh = sb_getblk(sb, group * bpg + blk_off);
 		if (unlikely(!bh)) {
-			err = -EIO;
+			err = -ENOMEM;
 			break;
 		}
 		ext3_debug("update metadata backup %#04lx\n",

fs/ext3/xattr.c

···
 			if (unlikely(!new_bh)) {
 getblk_failed:
 				ext3_free_blocks(handle, inode, block, 1);
-				error = -EIO;
+				error = -ENOMEM;
 				goto cleanup;
 			}
 			lock_buffer(new_bh);