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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>
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@ -540,6 +540,9 @@ struct f2fs_nm_info {
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/* for checkpoint */
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char *nat_bitmap; /* NAT bitmap pointer */
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#ifdef CONFIG_F2FS_CHECK_FS
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char *nat_bitmap_mir; /* NAT bitmap mirror */
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#endif
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int bitmap_size; /* bitmap size */
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};
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@ -2363,6 +2363,14 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
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GFP_KERNEL);
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if (!nm_i->nat_bitmap)
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return -ENOMEM;
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#ifdef CONFIG_F2FS_CHECK_FS
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nm_i->nat_bitmap_mir = kmemdup(version_bitmap, nm_i->bitmap_size,
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GFP_KERNEL);
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if (!nm_i->nat_bitmap_mir)
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return -ENOMEM;
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#endif
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return 0;
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}
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@ -2437,6 +2445,9 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
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up_write(&nm_i->nat_tree_lock);
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kfree(nm_i->nat_bitmap);
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#ifdef CONFIG_F2FS_CHECK_FS
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kfree(nm_i->nat_bitmap_mir);
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#endif
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sbi->nm_info = NULL;
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kfree(nm_i);
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}
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@ -186,6 +186,12 @@ static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
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static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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#ifdef CONFIG_F2FS_CHECK_FS
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if (memcmp(nm_i->nat_bitmap, nm_i->nat_bitmap_mir,
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nm_i->bitmap_size))
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f2fs_bug_on(sbi, 1);
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#endif
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memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);
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}
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@ -203,6 +209,12 @@ static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start)
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(seg_off << sbi->log_blocks_per_seg << 1) +
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(block_off & (sbi->blocks_per_seg - 1)));
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#ifdef CONFIG_F2FS_CHECK_FS
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if (f2fs_test_bit(block_off, nm_i->nat_bitmap) !=
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f2fs_test_bit(block_off, nm_i->nat_bitmap_mir))
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f2fs_bug_on(sbi, 1);
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#endif
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if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
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block_addr += sbi->blocks_per_seg;
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@ -228,6 +240,9 @@ static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid)
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unsigned int block_off = NAT_BLOCK_OFFSET(start_nid);
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f2fs_change_bit(block_off, nm_i->nat_bitmap);
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#ifdef CONFIG_F2FS_CHECK_FS
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f2fs_change_bit(block_off, nm_i->nat_bitmap_mir);
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#endif
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}
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static inline nid_t ino_of_node(struct page *node_page)
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