VFS_SYNC(9)            FreeBSD Kernel Developer's Manual           VFS_SYNC(9)

NAME
     VFS_SYNC - flush unwritten data

SYNOPSIS
     #include <sys/param.h>
     #include <sys/mount.h>
     #include <sys/vnode.h>

     int
     VFS_SYNC(struct mount *mp, int waitfor);

DESCRIPTION
     The VFS_SYNC() macro writes out all unwritten data in the file system
     mounted as mp.

     The arguments it expects are:

     mp           The file system.

     waitfor      Whether the function should wait for I/O to complete.
                  Possible values are:

                  MNT_WAIT    synchronously wait for I/O to complete

                  MNT_NOWAIT  start all I/O, but do not wait for it

                  MNT_LAZY    push data not written by file system syncer

     The VFS_SYNC() macro calls the vfs_sync method of the file system, which
     normally calls VOP_FSYNC(9) for all the vnodes in the file system.

SEE ALSO
     fsync(2), sync(2), VFS(9), vnode(9), VOP_FSYNC(9)

AUTHORS
     This manual page was written by Doug Rabson.

FreeBSD 13.1-RELEASE-p6          May 23, 2009          FreeBSD 13.1-RELEASE-p6