From mboxrd@z Thu Jan 1 00:00:00 1970 From: Li Zefan Subject: [PATCH] Btrfs: fix byte order issue in free space cache Date: Wed, 03 Aug 2011 16:12:12 +0800 Message-ID: <4E3902DC.4010105@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Cc: Josef Bacik To: "linux-btrfs@vger.kernel.org" Return-path: List-ID: We should convert the generation number to little endian before saving it to disk. We've just changed to use the normal checksumming infrastructure for free space cache, so it's the perfect time to fix this bug. Signed-off-by: Li Zefan --- fs/btrfs/free-space-cache.c | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 6377713..9277d65 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -325,7 +325,7 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, addr = kmap(page); if (index == 0) { - u64 *gen; + u64 gen; /* * We put a bogus crc in the front of the first page in @@ -335,11 +335,11 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, addr += sizeof(u64); offset += sizeof(u64); - gen = addr; - if (*gen != BTRFS_I(inode)->generation) { + gen = le64_to_cpu(*(__le64 *)addr); + if (gen != BTRFS_I(inode)->generation) { printk(KERN_ERR "btrfs: space cache generation" " (%llu) does not match inode (%llu)\n", - (unsigned long long)*gen, + (unsigned long long)gen, (unsigned long long) BTRFS_I(inode)->generation); kunmap(page); @@ -636,7 +636,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, orig = addr = kmap(page); if (index == 0) { - u64 *gen; + __le64 *gen; /* * We're going to put in a bogus crc for this page to @@ -647,7 +647,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, offset += sizeof(u64); gen = addr; - *gen = trans->transid; + *gen = cpu_to_le64(trans->transid); addr += sizeof(u64); offset += sizeof(u64); } -- 1.7.3.1