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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
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[[!meta title="file_syncfs"]]
routine file_syncfs (
file: file_t;
RPT
wait: int;
do_children: int);
Synchronize the entire filesystem.
This function has a companion in [[`fsys_syncfs`|fsys_syncfs]], which is
invoked on the server's control port instead of an arbitrary node. Both of
them are usually implemented in equivalent ways.
# 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]].
The implementation typically doesn't care on which specific node (as exported
by the implementing server) [[`file_syncfs`|file_syncfs]] is being invoked on.
## [[libtrivfs]]
Invoke [[`file_sync`|file_sync]] on the underlying node. Rationale: the
underlying node represents this filesystem's backend, and once this node is
synchronized, the whole [[libtrivfs]]-based filesystem is to be considered
synchronized.
### [[storeio]] / [[streamio]]
Instead of the to underlying node, pass the call through to the backend
(device).
## [[libnetfs]]
Invoke `netfs_attempt_syncfs`.
## [[libdiskfs]]
Invoke [[`fsys_syncfs`|fsys_syncfs]] on all active children, and invoke
`diskfs_sync_everything` and `diskfs_set_hypermetadata`.
# Usage Examples
## [[glibc]]
* `sync`
`file_syncfs ("/", false, true)` -- invoke it on the process' root directory
(`INIT_PORT_CRDIR`), don't wait for completion, do synchronize child
filesystems.
## [[Hurd]]
* [[`syncfs`|syncfs]]
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