We should convert the transaction id to little endian before saving
it to disk.
Signed-off-by: Li Zefan <l...@cn.fujitsu.com>
---
fs/btrfs/free-space-cache.c | 15 ++++++++-------
1 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 9f985a4..740dbf4 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -20,6 +20,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/math64.h>
+#include <asm/unaligned.h>
#include "ctree.h"
#include "free-space-cache.h"
#include "transaction.h"
@@ -340,14 +341,15 @@ int __load_free_space_cache(struct btrfs_root *root,
struct inode *inode,
addr = kmap(page);
if (index == 0) {
- u64 *gen;
+ u64 gen;
memcpy(disk_crcs, addr, first_page_offset);
- gen = addr + (sizeof(u32) * num_checksums);
- if (*gen != BTRFS_I(inode)->generation) {
+ gen = get_unaligned_le64(
+ addr + sizeof(u32) * num_checksums);
+ 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);
@@ -814,14 +816,13 @@ int __btrfs_write_out_cache(struct btrfs_root *root,
struct inode *inode,
/* Write the checksums and trans id to the first page */
{
void *addr;
- u64 *gen;
page = pages[0];
addr = kmap(page);
memcpy(addr, checksums, sizeof(u32) * num_pages);
- gen = addr + (sizeof(u32) * num_pages);
- *gen = trans->transid;
+ put_unaligned_le64(trans->transid,
+ addr + sizeof(u32) * num_pages);
kunmap(page);
}
--
1.7.3.1
--
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