INTRO (9) NetBSD Kernel Developer's Manual INTRO (9) NAME ...

VFSOPS (9) NetBSD Kernel Developer’s Manual VFSOPS (9)NAMEvfsops, VFS_MOUNT, VFS_START, VFS_UNMOUNT, VFS_ROOT, VFS_QUOTACTL, VFS_STATVFS,VFS_SYNC, VFS_VGET, VFS_FHTOVP, VFS_VPTOFH, VFS_SNAPSHOT, VFS_SUSPENDCTL —kernelfile system interfaceSYNOPSIS#include #include #include intVFS_MOUNT(struct mount ∗mp , const char ∗path , void ∗data , size_t ∗dlen );intVFS_START(struct mount ∗mp , int flags);intVFS_UNMOUNT(struct mount ∗mp , int mntflags);intVFS_ROOT(struct mount ∗mp , struct vnode ∗∗vpp);intVFS_QUOTACTL(struct mount ∗mp , int cmds , uid_t uid , void ∗arg);intVFS_STATVFS(struct mount ∗mp , struct statvfs ∗sbp);intVFS_SYNC(struct mount ∗mp , int waitfor , kauth_cred_t cred);intVFS_VGET(struct mount ∗mp , ino_t ino , struct vnode ∗∗vpp);intVFS_FHTOVP(struct mount ∗mp , struct fid ∗fhp , struct vnode ∗∗vpp);intVFS_VPTOFH(struct vnode ∗vp , struct fid ∗fhp , size_t ∗fh_size);intVFS_SNAPSHOT(struct mount ∗mp , struct vnode ∗vp , struct timespec ∗ts);intVFS_SUSPENDCTL(struct mount ∗mp , int cmd);DESCRIPTIONIn a similar fashion to the vnode(9) interface, all operations that are done on a file system are conductedthrough a single interface that allows the system to carry out operations on a file system without knowing itsconstruction or type.All supported file systems in the kernel have an entry in the vfs_list_initial table. This table is generated byconfig(1) and is a NULL-terminated list of vfsops structures. The vfsops structure describes the operationsthat can be done to a specific file system type. The following table lists the elements of the vfsops vector, thecorresponding invocation macro, and a description of the element.Vector element Macro Descriptionint (∗vfs_mount)() VFS_MOUNT Mount a file systemint (∗vfs_start)() VFS_START Make operationalNetBSD 3.0 January 24, 2008 1