FatFs f_lseek() behaviour different from POSIX

[oyama]

As specified in the FatFs documentation, FatFs f_lseek() has a different policy for reporting the file size when moving to an offset above SEEK_END. POSIX reports the actual file size of the write, whereas FatFs reports the size at the seeked position.

As a specific impact, when SQLite is used with FatFs, it reports error code 26 SQLITE_NOTADB when the database is opened.

Reference URL

• http://elm-chan.org/fsw/ff/doc/lseek.html
• https://sqlite-users.sqlite.narkive.com/KD2THS3d/sqlite-sqlite-on-freertos-fatfs-sqlite-notadb-during-create-table
• https://github.com/espressif/esp-idf/issues/9660

[oyama]

Changed to f_sync to match FatFs f_write. 4e4ae15