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authorChao Yu <yuchao0@huawei.com>2017-01-07 18:52:34 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2017-02-22 18:48:50 -0800
commitae27d62e6befd3cac4ffa702e644cc52019642e8 (patch)
treed1056be266950f6b7da2564001c9c71df7f7983e /fs/f2fs/segment.h
parent599a09b2c1ac222e6aad0c22515d1ccde7c3b702 (diff)
f2fs: check in-memory sit version bitmap
This patch adds a mirror for sit 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>
Diffstat (limited to 'fs/f2fs/segment.h')
-rw-r--r--fs/f2fs/segment.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 9af95194db06..5cb5755c75d9 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -209,6 +209,9 @@ struct sit_info {
block_t sit_blocks; /* # of blocks used by SIT area */
block_t written_valid_blocks; /* # of valid blocks in main area */
char *sit_bitmap; /* SIT bitmap pointer */
+#ifdef CONFIG_F2FS_CHECK_FS
+ char *sit_bitmap_mir; /* SIT bitmap mirror */
+#endif
unsigned int bitmap_size; /* SIT bitmap size */
unsigned long *tmp_map; /* bitmap for temporal use */
@@ -423,6 +426,12 @@ static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
void *dst_addr)
{
struct sit_info *sit_i = SIT_I(sbi);
+
+#ifdef CONFIG_F2FS_CHECK_FS
+ if (memcmp(sit_i->sit_bitmap, sit_i->sit_bitmap_mir,
+ sit_i->bitmap_size))
+ f2fs_bug_on(sbi, 1);
+#endif
memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
}
@@ -643,6 +652,12 @@ static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
check_seg_range(sbi, start);
+#ifdef CONFIG_F2FS_CHECK_FS
+ if (f2fs_test_bit(offset, sit_i->sit_bitmap) !=
+ f2fs_test_bit(offset, sit_i->sit_bitmap_mir))
+ f2fs_bug_on(sbi, 1);
+#endif
+
/* calculate sit block address */
if (f2fs_test_bit(offset, sit_i->sit_bitmap))
blk_addr += sit_i->sit_blocks;
@@ -668,6 +683,9 @@ static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
unsigned int block_off = SIT_BLOCK_OFFSET(start);
f2fs_change_bit(block_off, sit_i->sit_bitmap);
+#ifdef CONFIG_F2FS_CHECK_FS
+ f2fs_change_bit(block_off, sit_i->sit_bitmap_mir);
+#endif
}
static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi)