From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-da0-f46.google.com ([209.85.210.46]:54399 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753899Ab2JHIKx (ORCPT ); Mon, 8 Oct 2012 04:10:53 -0400 Received: by mail-da0-f46.google.com with SMTP id n41so1433320dak.19 for ; Mon, 08 Oct 2012 01:10:52 -0700 (PDT) From: Robin Dong To: linux-btrfs@vger.kernel.org Cc: Robin Dong Subject: [PATCH v3 1/2] btrfs-progs: limit the max value of leafsize and nodesize Date: Mon, 8 Oct 2012 16:10:40 +0800 Message-Id: <1349683841-27981-1-git-send-email-robin.k.dong@gmail.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Robin Dong Using mkfs.btrfs like: mkfs.btrfs -l 131072 /dev/sda will return no error, but after mount it, the dmesg will report: BTRFS: couldn't mount because metadata blocksize (131072) was too large The leafsize and nodesize are equal at present, so we just use one function "check_leaf_or_node_size" to limit leaf and node size below BTRFS_MAX_METADATA_BLOCKSIZE. Signed-off-by: Robin Dong Reviewed-by: David Sterba --- ctree.h | 6 ++++++ mkfs.c | 29 +++++++++++++++++++++++------ 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/ctree.h b/ctree.h index 7f55229..75c1e0a 100644 --- a/ctree.h +++ b/ctree.h @@ -111,6 +111,12 @@ struct btrfs_trans_handle; #define BTRFS_DEV_ITEMS_OBJECTID 1ULL /* + * the max metadata block size. This limit is somewhat artificial, + * but the memmove costs go through the roof for larger blocks. + */ +#define BTRFS_MAX_METADATA_BLOCKSIZE 65536 + +/* * we can actually store much bigger names, but lets not confuse the rest * of linux */ diff --git a/mkfs.c b/mkfs.c index dff5eb8..93672b9 100644 --- a/mkfs.c +++ b/mkfs.c @@ -1201,6 +1201,27 @@ static int zero_output_file(int out_fd, u64 size, u32 sectorsize) return ret; } +static int check_leaf_or_node_size(u32 size, u32 sectorsize) +{ + if (size < sectorsize) { + fprintf(stderr, + "Illegal leafsize (or nodesize) %u (smaller than sectorsize %u)\n", + size, sectorsize); + return -1; + } else if (size > BTRFS_MAX_METADATA_BLOCKSIZE) { + fprintf(stderr, + "Illegal leafsize (or nodesize) %u (larger than %u)\n", + size, BTRFS_MAX_METADATA_BLOCKSIZE); + return -1; + } else if (size & (sectorsize - 1)) { + fprintf(stderr, + "Illegal leafsize (or nodesize) %u (not aligned to %u)\n", + size, sectorsize); + return -1; + } + return 0; +} + int main(int ac, char **av) { char *file; @@ -1291,14 +1312,10 @@ int main(int ac, char **av) } } sectorsize = max(sectorsize, (u32)getpagesize()); - if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) { - fprintf(stderr, "Illegal leafsize %u\n", leafsize); + if (check_leaf_or_node_size(leafsize, sectorsize)) exit(1); - } - if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) { - fprintf(stderr, "Illegal nodesize %u\n", nodesize); + if (check_leaf_or_node_size(nodesize, sectorsize)) exit(1); - } ac = ac - optind; if (ac == 0) print_usage(); -- 1.7.3.2