FDATASYNCSection: Linux Programmer's Manual (2)
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NAMEfdatasync - synchronize a file's in-core data with that on disk
int fdatasync(int fd);
DESCRIPTIONfdatasync flushes all data buffers of a file to disk (before the system call returns). It resembles fsync but is not required to update the metadata such as access time.
Applications that access databases or log files often write a tiny data fragment (e.g., one line in a log file) and then call fsync immediately in order to ensure that the written data is physically stored on the harddisk. Unfortunately, fsync will always initiate two write operations: one for the newly written data and another one in order to update the modification time stored in the inode. If the modification time is not a part of the transaction concept fdatasync can be used to avoid unnecessary inode disk write operations.
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
BUGSCurrently (Linux 2.2) fdatasync is equivalent to fsync.
CONFORMING TOPOSIX1b (formerly POSIX.4)
SEE ALSOfsync(2), B.O. Gallmeister, POSIX.4, O'Reilly, pp. 220-223 and 343.
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Time: 15:23:26 GMT, July 17, 2018