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[[!meta copyright="Copyright © 1994, 1995, 1996, 1997, 1998, 1999, 2002, 2009
Free Software Foundation, Inc."]]
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id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
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[[!meta title="file_sync"]]
routine file_sync (
file: file_t;
RPT
wait: int;
omit_metadata: int);
Sync the individual file. If `omit_metadata` is set, then it is only necessary
for the server to updated the actual contents of the file, not any associated
metadata.
# Implementation Examples
Servers that either don't keep any unsynchronized state (or don't have a
backing store at all) can simply `return 0`. Examples: [[translator/nfs]].
## [[libtrivfs]]
Pass the call through to the underlying node.
### [[storeio]] / [[streamio]]
Instead of to the underlying node, pass the call through to the backend
(device).
## [[libnetfs]]
Invoke `netfs_attempt_sync`.
## [[libdiskfs]]
Invoke `diskfs_file_update`.
# Usage Examples
## [[glibc]]
* `fdatasync`
`file_syncfs (FD, true, true)` -- invoke it on the passed file descriptor,
do wait for completion, do allow omitting to update the associated
metadata.
* `fsync`
`file_syncfs (FD, true, false)` -- invoke it on the passed file descriptor,
do wait for completion, don't allow omitting to update the associated
metadata.
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