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f2fs: check in-memory nat version bitmap 

This patch adds a mirror for nat version bitmap, and use it to detect
in-memory bitmap corruption which may be caused by bit-transition of
cache or memory overflow.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-01-07 18:52:01 +08:00 committed by Jaegeuk Kim
parent 355e78913c
commit 599a09b2c1
3 changed files with 29 additions and 0 deletions
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3
fs/f2fs/f2fs.h
View File

@ -540,6 +540,9 @@ struct f2fs_nm_info {
/* for checkpoint */
char *nat_bitmap; /* NAT bitmap pointer */
#ifdef CONFIG_F2FS_CHECK_FS
char *nat_bitmap_mir; /* NAT bitmap mirror */
#endif
int bitmap_size; /* bitmap size */
};

11
fs/f2fs/node.c
View File

@ -2363,6 +2363,14 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
GFP_KERNEL);
if (!nm_i->nat_bitmap)
return -ENOMEM;
#ifdef CONFIG_F2FS_CHECK_FS
nm_i->nat_bitmap_mir = kmemdup(version_bitmap, nm_i->bitmap_size,
GFP_KERNEL);
if (!nm_i->nat_bitmap_mir)
return -ENOMEM;
#endif
return 0;
}
@ -2437,6 +2445,9 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
up_write(&nm_i->nat_tree_lock);
kfree(nm_i->nat_bitmap);
#ifdef CONFIG_F2FS_CHECK_FS
kfree(nm_i->nat_bitmap_mir);
#endif
sbi->nm_info = NULL;
kfree(nm_i);
}

15
fs/f2fs/node.h
View File

@ -186,6 +186,12 @@ static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
#ifdef CONFIG_F2FS_CHECK_FS
if (memcmp(nm_i->nat_bitmap, nm_i->nat_bitmap_mir,
nm_i->bitmap_size))
f2fs_bug_on(sbi, 1);
#endif
memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);
}
@ -203,6 +209,12 @@ static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start)
(seg_off << sbi->log_blocks_per_seg << 1) +
(block_off & (sbi->blocks_per_seg - 1)));
#ifdef CONFIG_F2FS_CHECK_FS
if (f2fs_test_bit(block_off, nm_i->nat_bitmap) !=
f2fs_test_bit(block_off, nm_i->nat_bitmap_mir))
f2fs_bug_on(sbi, 1);
#endif
if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
block_addr += sbi->blocks_per_seg;
@ -228,6 +240,9 @@ static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid)
unsigned int block_off = NAT_BLOCK_OFFSET(start_nid);
f2fs_change_bit(block_off, nm_i->nat_bitmap);
#ifdef CONFIG_F2FS_CHECK_FS
f2fs_change_bit(block_off, nm_i->nat_bitmap_mir);
#endif
}
static inline nid_t ino_of_node(struct page *node_page)