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yinshengkai
450e760d16
This patch adds support for the FIOC_FILEPATH ioctl command in the FAT filesystem, allowing applications to retrieve the full path of an open file descriptor. Key features: - Implements fat_getfilepath() to construct file paths by traversing parent directories using ".." entries - Adds fat_findlfnstart() helper to locate the start of LFN sequences - Supports both FAT12/16 and FAT32 filesystem types - Handles both regular directories and root directory traversal This functionality is useful for debugging, logging, and applications that need to track file paths at runtime. Signed-off-by: yinshengkai <yinshengkai@bytedance.com>