VFS_SYNC(9)

okay bestie, welcome to VFS_SYNC(9) from the Kernel Developer's Manual — the page that's literally about making sure your file system's unwritten data gets flushed. no cap, this is the group-chat explanation. 💅

🌸 NAME

VFS_SYNC — flush unwritten data. that's it. that's the whole name. ✨

🦋 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. it's giving “clean up your room before guests arrive” but for kernel I/O. 🔥

The arguments it expects are:

• mp — the file system. literally the mount we're talking about. 🫶
• 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. so it's not out here doing random stuff — it's delegating to the file system's own sync method, iykyk. 👑

🌈 SEE ALSO

• fsync(2)
• sync(2)
• VFS(9)
• vnode(9)
• VOP_FSYNC(9)

🎀 AUTHORS

This manual page was written by Doug Rabson. iconic behavior, honestly. 💜

Debian · May 23, 2009 · VFS_SYNC(9) — that's the source, version, and date sign-off, and we're done. periodt. 💖