The SQLITE_IOERR_DIR_FSYNC error code is an extended error code for SQLITE_IOERR indicating an I/O error in the VFS layer while trying to invoke fsync() on a directory. The unix VFS attempts to fsync() directories after creating or deleting certain files to ensure that those files will still appear in the filesystem following a power loss or system crash. This error code indicates a problem attempting to perform that fsync().
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