317 lines
7.4 KiB
C
317 lines
7.4 KiB
C
/*
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* Written by Julian Elischer (julian@DIALix.oz.au)
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*
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* $Header: /home/ncvs/src/sys/miscfs/devfs/devfs_vfsops.c,v 1.19 1997/08/02 14:31:55 bde Exp $
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*
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <miscfs/devfs/devfsdefs.h>
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static int devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p);
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static int mountdevfs( struct mount *mp, struct proc *p);
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static int
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devfs_init(struct vfsconf *vfsp)
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{
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/*
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* fill in the missing members on the "hidden" mount
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*/
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dev_root->dnp->dvm->mount->mnt_op = vfsp->vfc_vfsops;
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dev_root->dnp->dvm->mount->mnt_vfc = vfsp;
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/* Mark a reference for the "invisible" blueprint mount */
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dev_root->dnp->dvm->mount->mnt_vfc->vfc_refcount++;
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printf("DEVFS: ready to run\n");
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return 0; /*XXX*/
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}
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/*
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* mp - pointer to 'mount' structure
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* path - addr in user space of mount point (ie /usr or whatever)
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* data - addr in user space of mount params including the
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* name of the block special file to treat as a filesystem.
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* ndp - namei data pointer
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* p - proc pointer
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* devfs is special in that it doesn't require any device to be mounted..
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* It makes up it's data as it goes along.
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* it must be mounted during single user.. until it is, only std{in/out/err}
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* and the root filesystem are available.
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*/
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/*proto*/
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int
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devfs_mount(struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p)
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{
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struct devfsmount *devfs_mp_p; /* devfs specific mount control block */
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int error;
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u_int size;
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DBPRINT(("mount "));
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/*
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* If they just want to update, we don't need to do anything.
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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{
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return 0;
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}
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/*
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* Well, it's not an update, it's a real mount request.
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* Time to get dirty.
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* HERE we should check to see if we are already mounted here.
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*/
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if(error = mountdevfs( mp, p))
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return (error);
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/*
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* Copy in the name of the directory the filesystem
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* is to be mounted on.
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* And we clear the remainder of the character strings
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* to be tidy.
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* Then, we try to fill in the filesystem stats structure
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* as best we can with whatever we can think of at the time
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*/
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devfs_mp_p = (struct devfsmount *)mp->mnt_data;
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if(devfs_up_and_going) {
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copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname,
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sizeof(mp->mnt_stat.f_mntonname)-1, &size);
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bzero(mp->mnt_stat.f_mntonname + size,
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sizeof(mp->mnt_stat.f_mntonname) - size);
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} else {
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bcopy("dummy_mount", (caddr_t)mp->mnt_stat.f_mntonname,12);
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}
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bzero(mp->mnt_stat.f_mntfromname , MNAMELEN );
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bcopy("devfs",mp->mnt_stat.f_mntfromname, 5);
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(void)devfs_statfs(mp, &mp->mnt_stat, p);
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return 0;
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}
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static int
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mountdevfs( struct mount *mp, struct proc *p)
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{
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int error = 0;
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struct devfsmount *devfs_mp_p;
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devfs_mp_p = (struct devfsmount *)malloc(sizeof *devfs_mp_p,
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M_DEVFSMNT, M_WAITOK);
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bzero(devfs_mp_p,sizeof(*devfs_mp_p));
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devfs_mp_p->mount = mp;
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/*
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* Fill out some fields
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*/
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mp->mnt_data = (qaddr_t)devfs_mp_p;
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mp->mnt_stat.f_type = MOUNT_DEVFS;
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mp->mnt_stat.f_fsid.val[0] = (long)devfs_mp_p;
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mp->mnt_stat.f_fsid.val[1] = MOUNT_DEVFS;
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mp->mnt_flag |= MNT_LOCAL;
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if(error = dev_dup_plane(devfs_mp_p))
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{
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mp->mnt_data = (qaddr_t)0;
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free((caddr_t)devfs_mp_p, M_DEVFSMNT);
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}
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return error;
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}
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static int
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devfs_start(struct mount *mp, int flags, struct proc *p)
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{
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DBPRINT(("start "));
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return 0;
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}
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/*
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* Unmount the filesystem described by mp.
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*/
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static int
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devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
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{
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struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
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int flags = 0;
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int error;
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if (mntflags & MNT_FORCE) {
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flags |= FORCECLOSE;
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}
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error = vflush(mp, NULLVP, flags);
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if (error)
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return error;
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DBPRINT(("unmount "));
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devfs_free_plane(devfs_mp_p);
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free((caddr_t)devfs_mp_p, M_DEVFSMNT);
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mp->mnt_data = (qaddr_t)0;
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mp->mnt_flag &= ~MNT_LOCAL;
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return 0;
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}
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/* return the address of the root vnode in *vpp */
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static int
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devfs_root(struct mount *mp, struct vnode **vpp)
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{
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struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
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DBPRINT(("root "));
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devfs_dntovn(devfs_mp_p->plane_root->dnp,vpp);
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return 0;
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}
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static int
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devfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
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struct proc *p)
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{
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DBPRINT(("quotactl "));
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return EOPNOTSUPP;
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}
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static int
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devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p)
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{
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struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
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/*
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* Fill in the stat block.
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*/
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DBPRINT(("statfs "));
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sbp->f_type = MOUNT_DEVFS;
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sbp->f_flags = 0; /* XXX */
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sbp->f_bsize = 128;
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sbp->f_iosize = 1024; /* XXX*/
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sbp->f_blocks = 128;
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 128;
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sbp->f_ffree = 0; /* what to put in here? */
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sbp->f_fsid.val[0] = (long)devfs_mp_p;
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sbp->f_fsid.val[1] = MOUNT_DEVFS;
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/*
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* Copy the mounted on and mounted from names into
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* the passed in stat block, if it is not the one
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* in the mount structure.
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*/
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if (sbp != &mp->mnt_stat) {
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bcopy((caddr_t)mp->mnt_stat.f_mntonname,
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(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
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bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
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(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
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}
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return 0;
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}
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/*
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* Go through the disk queues to initiate sandbagged IO;
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* go through the inodes to write those that have been modified;
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* initiate the writing of the super block if it has been modified.
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*
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* Note: we are always called with the filesystem marked `MPBUSY'.
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*/
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static int
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devfs_sync(struct mount *mp, int waitfor,struct ucred *cred,struct proc *p)
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{
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register struct vnode *vp, *nvp;
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struct timeval tv;
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int error, allerror = 0;
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DBPRINT(("sync "));
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/*
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* Write back modified superblock.
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* Consistency check that the superblock
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* is still in the buffer cache.
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*/
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/*
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* Write back each (modified) inode.
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*/
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loop:
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for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
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/*
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* If the vnode that we are about to sync is no longer
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* associated with this mount point, start over.
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*/
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if (vp->v_mount != mp)
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goto loop;
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nvp = vp->v_mntvnodes.le_next;
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if (VOP_ISLOCKED(vp))
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continue;
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if ( vp->v_dirtyblkhd.lh_first == NULL)
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continue;
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if (vp->v_type == VBLK) {
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if (vget(vp, LK_EXCLUSIVE, p))
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goto loop;
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error = VOP_FSYNC(vp, cred, waitfor, p);
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if (error)
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allerror = error;
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vput(vp);
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}
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#ifdef NOTYET
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else {
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tv = time;
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/* VOP_UPDATE(vp, &tv, &tv, waitfor == MNT_WAIT); */
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VOP_UPDATE(vp, &tv, &tv, 0);
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}
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#endif
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}
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/*
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* Force stale file system control information to be flushed.
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*( except that htat makes no sense with devfs
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*/
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return (allerror);
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}
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static int
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devfs_vget(struct mount *mp, ino_t ino,struct vnode **vpp)
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{
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DBPRINT(("vget "));
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return EOPNOTSUPP;
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}
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/*************************************************************
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* The concept of exporting a kernel generated devfs is stupid
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* So don't handle filehandles
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*/
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static int
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devfs_fhtovp (struct mount *mp, struct fid *fhp, struct sockaddr *nam,
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struct vnode **vpp, int *exflagsp, struct ucred **credanonp)
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{
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DBPRINT(("fhtovp "));
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return (EINVAL);
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}
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static int
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devfs_vptofh (struct vnode *vp, struct fid *fhp)
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{
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DBPRINT(("vptofh "));
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return (EINVAL);
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}
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static struct vfsops devfs_vfsops = {
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devfs_mount,
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devfs_start,
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devfs_unmount,
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devfs_root,
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devfs_quotactl,
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devfs_statfs,
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devfs_sync,
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devfs_vget,
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devfs_fhtovp,
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devfs_vptofh,
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devfs_init
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};
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VFS_SET(devfs_vfsops, devfs, MOUNT_DEVFS, 0);
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