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Add support for a last-close handler.

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Revert the module version bumps; they're quite pointless as long as the
only pseudofs consumer is linprocfs, which is in the tree.
This commit is contained in:
Dag-Erling Smørgrav 2001-11-27 13:26:27 +00:00
parent 3f7ec6a843
commit 98c7e22c50
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=86969
3 changed files with 38 additions and 3 deletions
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2
sys/fs/pseudofs/pseudofs.c
View file

@ -392,4 +392,4 @@ static moduledata_t pseudofs_data = {
NULL
};
DECLARE_MODULE(pseudofs, pseudofs_data, SI_SUB_EXEC, SI_ORDER_FIRST);
MODULE_VERSION(pseudofs, 3);
MODULE_VERSION(pseudofs, 1);

12
sys/fs/pseudofs/pseudofs.h
View file

@ -132,6 +132,15 @@ typedef int (*pfs_vis_t)(PFS_VIS_ARGS);
int name(PFS_IOCTL_ARGS);
typedef int (*pfs_ioctl_t)(PFS_IOCTL_ARGS);
/*
* Last-close callback
*/
#define PFS_CLOSE_ARGS \
struct thread *td, struct proc *p, struct pfs_node *pn
#define PFS_CLOSE_PROTO(name) \
int name(PFS_CLOSE_ARGS);
typedef int (*pfs_close_t)(PFS_CLOSE_ARGS);
/*
* pfs_info: describes a pseudofs instance
*/
@ -160,6 +169,7 @@ struct pfs_node {
#define pn_func u1._pn_func
#define pn_nodes u1._pn_nodes
pfs_ioctl_t pn_ioctl;
pfs_close_t pn_close;
pfs_attr_t pn_attr;
pfs_vis_t pn_vis;
void *pn_data;
@ -245,6 +255,6 @@ static struct vfsops name##_vfsops = { \
}; \
VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC); \
MODULE_VERSION(name, version); \
MODULE_DEPEND(name, pseudofs, 3, 3, 3);
MODULE_DEPEND(name, pseudofs, 1, 1, 1);
#endif

27
sys/fs/pseudofs/pseudofs_vnops.c
View file

@ -121,7 +121,32 @@ pfs_access(struct vop_access_args *va)
static int
pfs_close(struct vop_close_args *va)
{
PFS_RETURN (0);
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct proc *proc;
int error;
PFS_TRACE((pn->pn_name));
/*
* Do nothing unless this is the last close and the node has a
* last-close handler.
*/
if (vn->v_usecount > 1 || pn->pn_close == NULL)
PFS_RETURN (0);
if (pvd->pvd_pid != NO_PID)
proc = pfind(pvd->pvd_pid);
else
proc = NULL;
error = (pn->pn_close)(va->a_td, proc, pn);
if (proc != NULL)
PROC_UNLOCK(proc);
PFS_RETURN (error);
}
/*