f2fs: fix to check i_compr_blocks correctly

inode.i_blocks counts based on 512byte sector, we need to convert
to 4kb sized block count before comparing to i_compr_blocks.

In addition, add to print message when sanity check on inode
compression configs failed.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/inode.c

@@ -291,13 +291,30 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 			fi->i_flags & F2FS_COMPR_FL &&
 			F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
 						i_log_cluster_size)) {
-		if (ri->i_compress_algorithm >= COMPRESS_MAX)
+		if (ri->i_compress_algorithm >= COMPRESS_MAX) {
+			f2fs_warn(sbi, "%s: inode (ino=%lx) has unsupported "
+				"compress algorithm: %u, run fsck to fix",
+				  __func__, inode->i_ino,
+				  ri->i_compress_algorithm);
 			return false;
-		if (le64_to_cpu(ri->i_compr_blocks) > inode->i_blocks)
+		}
+		if (le64_to_cpu(ri->i_compr_blocks) >
+				SECTOR_TO_BLOCK(inode->i_blocks)) {
+			f2fs_warn(sbi, "%s: inode (ino=%lx) has inconsistent "
+				"i_compr_blocks:%llu, i_blocks:%llu, run fsck to fix",
+				  __func__, inode->i_ino,
+				  le64_to_cpu(ri->i_compr_blocks),
+				  SECTOR_TO_BLOCK(inode->i_blocks));
 			return false;
+		}
 		if (ri->i_log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
-			ri->i_log_cluster_size > MAX_COMPRESS_LOG_SIZE)
+			ri->i_log_cluster_size > MAX_COMPRESS_LOG_SIZE) {
+			f2fs_warn(sbi, "%s: inode (ino=%lx) has unsupported "
+				"log cluster size: %u, run fsck to fix",
+				  __func__, inode->i_ino,
+				  ri->i_log_cluster_size);
 			return false;
+		}
 	}
 
 	return true;