The checksums array is unused, remove it. We only need disk_crcs array
to verify checksums.
There is no need to allocate first_page_offset bytes for disk_crcs
array. It's enough to allocate num_checksums bytes because disk_crcs
only holds checksums while gen pointer is computed and used
independently.
cur_crc is initialized later in the code. Don't initialize it in a
declaration.
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
---
fs/btrfs/free-space-cache.c | 12 ++++--------
1 files changed, 4 insertions(+), 8 deletions(-)
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 60d6842..258e45d 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -215,14 +215,14 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
struct extent_buffer *leaf;
struct page *page;
struct btrfs_path *path;
- u32 *checksums = NULL, *crc;
+ u32 *crc = NULL;
char *disk_crcs = NULL;
struct btrfs_key key;
struct list_head bitmaps;
u64 num_entries;
u64 num_bitmaps;
u64 generation;
- u32 cur_crc = ~(u32)0;
+ u32 cur_crc;
pgoff_t index = 0;
unsigned long first_page_offset;
int num_checksums;
@@ -298,11 +298,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
/* Setup everything for doing checksumming */
num_checksums = i_size_read(inode) / PAGE_CACHE_SIZE;
- checksums = crc = kzalloc(sizeof(u32) * num_checksums, GFP_NOFS);
- if (!checksums)
- goto out;
first_page_offset = (sizeof(u32) * num_checksums) + sizeof(u64);
- disk_crcs = kzalloc(first_page_offset, GFP_NOFS);
+ disk_crcs = kzalloc(num_checksums, GFP_NOFS);
if (!disk_crcs)
goto out;
@@ -352,7 +349,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
if (index == 0) {
u64 *gen;
- memcpy(disk_crcs, addr, first_page_offset);
+ memcpy(disk_crcs, addr, num_checksums);
gen = addr + (sizeof(u32) * num_checksums);
if (*gen != BTRFS_I(inode)->generation) {
printk(KERN_ERR "btrfs: space cache generation"
@@ -467,7 +464,6 @@ next:
ret = 1;
out:
- kfree(checksums);
kfree(disk_crcs);
iput(inode);
return ret;
--
1.7.2.3
--
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