344 lines
8.8 KiB
C
344 lines
8.8 KiB
C
|
|
/* This file contains the routines related to vnodes.
|
|
* The entry points are:
|
|
*
|
|
* get_vnode - increase counter and get details of an inode
|
|
* get_free_vnode - get a pointer to a free vnode obj
|
|
* find_vnode - find a vnode according to the FS endpoint and the inode num.
|
|
* dup_vnode - duplicate vnode (i.e. increase counter)
|
|
* put_vnode - drop vnode (i.e. decrease counter)
|
|
*
|
|
* Jul 2006 (Balazs Gerofi)
|
|
*/
|
|
#include "fs.h"
|
|
#include "vnode.h"
|
|
#include "vmnt.h"
|
|
|
|
#include "fproc.h"
|
|
#include "file.h"
|
|
|
|
#include <minix/vfsif.h>
|
|
|
|
/*===========================================================================*
|
|
* get_vnode *
|
|
*===========================================================================*/
|
|
PUBLIC struct vnode *get_vnode(int fs_e, int inode_nr)
|
|
{
|
|
/* get_vnode() is called to get the details of the specified inode.
|
|
* Note that inode's usage counter in the FS is supposed to be incremented.
|
|
*/
|
|
struct vnode *vp, *vp2;
|
|
struct vmnt *vmp;
|
|
|
|
/* Request & response structures */
|
|
struct node_req req;
|
|
struct node_details res;
|
|
|
|
/* XXX remove this when debugging is complete */
|
|
if (find_vnode(fs_e, inode_nr) != NULL)
|
|
panic(__FILE__, "get_vnode: vnode already present", NO_NUM);
|
|
|
|
/* Check whether a free vnode is avaliable */
|
|
if ((vp = get_free_vnode(__FILE__, __LINE__)) == NIL_VNODE) {
|
|
printf("VFSget_vnode: no vnode available\n");
|
|
return NIL_VNODE;
|
|
}
|
|
|
|
/* Fill req struct */
|
|
req.inode_nr = inode_nr;
|
|
req.fs_e = fs_e;
|
|
|
|
/* Send request to FS */
|
|
if (req_getnode(&req, &res) != OK) {
|
|
printf("VFSget_vnode: couldn't find vnode\n");
|
|
return NIL_VNODE;
|
|
}
|
|
|
|
/* Fill in the free vnode's fields and return it */
|
|
vp->v_fs_e = res.fs_e;
|
|
vp->v_inode_nr = res.inode_nr;
|
|
vp->v_mode = res.fmode;
|
|
vp->v_size = res.fsize;
|
|
vp->v_sdev = res.dev;
|
|
|
|
/* Find corresponding virtual mount object */
|
|
if ( (vmp = find_vmnt(vp->v_fs_e)) == NIL_VMNT)
|
|
printf("VFS: vmnt not found by get_vnode()\n");
|
|
|
|
vp->v_vmnt = vmp;
|
|
vp->v_dev = vmp->m_dev;
|
|
vp->v_fs_count = 1;
|
|
vp->v_ref_count = 1;
|
|
|
|
return vp;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* get_vnode *
|
|
*===========================================================================*/
|
|
PUBLIC struct vnode *get_vnode_x(int fs_e, int inode_nr)
|
|
{
|
|
/* get_vnode() is called to get the details of the specified inode.
|
|
* Note that inode's usage counter in the FS is supposed to be incremented.
|
|
*/
|
|
struct vnode *vp, *vp2;
|
|
struct vmnt *vmp;
|
|
|
|
/* Request & response structures */
|
|
struct node_req req;
|
|
struct node_details res;
|
|
|
|
vp= find_vnode(fs_e, inode_nr);
|
|
if (vp)
|
|
{
|
|
vp->v_ref_count++;
|
|
return vp;
|
|
}
|
|
|
|
return get_vnode(fs_e, inode_nr);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* get_free_vnode *
|
|
*===========================================================================*/
|
|
PUBLIC struct vnode *get_free_vnode(file, line)
|
|
char *file;
|
|
int line;
|
|
{
|
|
/* Find a free vnode slot in the vnode table */
|
|
struct vnode *vp;
|
|
|
|
for (vp = &vnode[0]; vp < &vnode[NR_VNODES]; ++vp)
|
|
if (vp->v_ref_count == 0)
|
|
{
|
|
vp->v_pipe= NO_PIPE;
|
|
vp->v_uid= -1;
|
|
vp->v_gid= -1;
|
|
vp->v_sdev= -1;
|
|
vp->v_file= file;
|
|
vp->v_line= line;
|
|
return vp;
|
|
}
|
|
|
|
|
|
err_code = ENFILE;
|
|
return NIL_VNODE;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* find_vnode *
|
|
*===========================================================================*/
|
|
PUBLIC struct vnode *find_vnode(int fs_e, int numb)
|
|
{
|
|
/* Find a specified (FS endpoint and inode number) vnode in the
|
|
* vnode table */
|
|
struct vnode *vp;
|
|
|
|
for (vp = &vnode[0]; vp < &vnode[NR_VNODES]; ++vp)
|
|
if (vp->v_ref_count > 0 && vp->v_inode_nr == numb
|
|
&& vp->v_fs_e == fs_e) return vp;
|
|
|
|
return NIL_VNODE;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* dup_vnode *
|
|
*===========================================================================*/
|
|
PUBLIC void dup_vnode(struct vnode *vp)
|
|
{
|
|
/* dup_vnode() is called to increment the vnode and therefore the
|
|
* referred inode's counter.
|
|
*/
|
|
if (vp == NIL_VNODE) {
|
|
printf("VFSdup_vnode NIL_VNODE\n");
|
|
return;
|
|
}
|
|
|
|
vp->v_ref_count++;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* put_vnode *
|
|
*===========================================================================*/
|
|
PUBLIC void put_vnode(struct vnode *vp)
|
|
{
|
|
/* Decrease vnode's usage counter and decrease inode's usage counter in the
|
|
* corresponding FS process.
|
|
*/
|
|
if (vp == NIL_VNODE) {
|
|
/*printf("VFSput_vnode NIL_VNODE\n");*/
|
|
return;
|
|
}
|
|
|
|
if (vp < &vnode[0] || vp >= &vnode[NR_VNODES])
|
|
{
|
|
printf("put_vnode: &vnode[0] = %p, &vnode[NR_VNODES] = %p, vp = %p\n",
|
|
&vnode[0], &vnode[NR_VNODES], vp);
|
|
panic(__FILE__, "put_vnode: bad vnode pointer", NO_NUM);
|
|
}
|
|
|
|
if (vp->v_ref_count > 1)
|
|
{
|
|
/* Decrease counter */
|
|
vp->v_ref_count--;
|
|
if (vp->v_fs_count > 256)
|
|
vnode_clean_refs(vp);
|
|
return;
|
|
}
|
|
|
|
if (vp->v_ref_count <= 0)
|
|
{
|
|
printf("put_vnode: bad v_ref_count %d\n", vp->v_ref_count);
|
|
panic(__FILE__, "put_vnode failed", NO_NUM);
|
|
}
|
|
if (vp->v_fs_count <= 0)
|
|
{
|
|
printf("put_vnode: bad v_fs_count %d\n", vp->v_fs_count);
|
|
panic(__FILE__, "put_vnode failed", NO_NUM);
|
|
}
|
|
|
|
/* Send request */
|
|
if (req_putnode(vp->v_fs_e, vp->v_inode_nr, vp->v_fs_count) != OK)
|
|
printf("VFSput_vnode Warning: inode doesn't exist\n");
|
|
|
|
vp->v_fs_count= 0;
|
|
vp->v_ref_count= 0;
|
|
vp->v_pipe = NO_PIPE;
|
|
vp->v_sdev = NO_DEV;
|
|
vp->v_index = 0;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* vnode_clean_refs *
|
|
*===========================================================================*/
|
|
PUBLIC void vnode_clean_refs(struct vnode *vp)
|
|
{
|
|
/* Tell the underlying FS to drop all reference but one. */
|
|
if (vp == NIL_VNODE) {
|
|
return;
|
|
}
|
|
|
|
if (vp->v_fs_count <= 1)
|
|
return; /* Nothing to do */
|
|
printf("vnode_clean_refs: dropping some references at FS\n");
|
|
if (req_putnode(vp->v_fs_e, vp->v_inode_nr, vp->v_fs_count-1) != OK)
|
|
printf("vnode_clean_refs: req_putnode failed\n");
|
|
vp->v_fs_count= 1;
|
|
}
|
|
|
|
|
|
#if 0
|
|
/*===========================================================================*
|
|
* mark_vn *
|
|
*===========================================================================*/
|
|
PUBLIC void mark_vn(vp, file, line)
|
|
struct vnode *vp;
|
|
char *file;
|
|
int line;
|
|
{
|
|
if (!vp)
|
|
return;
|
|
vp->v_file= file;
|
|
vp->v_line= line;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* check_vrefs *
|
|
*===========================================================================*/
|
|
PUBLIC int check_vrefs()
|
|
{
|
|
int i, bad;
|
|
int ispipe_flag, ispipe_mode;
|
|
struct vnode *vp;
|
|
struct vmnt *vmp;
|
|
struct fproc *rfp;
|
|
struct filp *f;
|
|
|
|
/* Clear v_ref_check */
|
|
for (vp = &vnode[0]; vp < &vnode[NR_VNODES]; ++vp)
|
|
vp->v_ref_check= 0;
|
|
|
|
/* Count reference for processes */
|
|
for (rfp=&fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {
|
|
if (rfp->fp_pid == PID_FREE)
|
|
continue;
|
|
vp= rfp->fp_rd;
|
|
if (vp < &vnode[0] || vp >= &vnode[NR_VNODES])
|
|
panic(__FILE__, "check_vrefs: bad vnode", NO_NUM);
|
|
vp->v_ref_check++;
|
|
|
|
vp= rfp->fp_wd;
|
|
if (vp < &vnode[0] || vp >= &vnode[NR_VNODES])
|
|
panic(__FILE__, "check_vrefs: bad vnode", NO_NUM);
|
|
vp->v_ref_check++;
|
|
|
|
}
|
|
|
|
/* Count references from filedescriptors */
|
|
for (f = &filp[0]; f < &filp[NR_FILPS]; f++)
|
|
{
|
|
if (f->filp_count == 0)
|
|
continue;
|
|
vp= f->filp_vno;
|
|
if (vp < &vnode[0] || vp >= &vnode[NR_VNODES])
|
|
panic(__FILE__, "check_vrefs: bad vnode", NO_NUM);
|
|
vp->v_ref_check++;
|
|
}
|
|
|
|
/* Count references to mount points */
|
|
for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp)
|
|
{
|
|
if (vmp->m_dev == NO_DEV)
|
|
continue;
|
|
vp= vmp->m_mounted_on;
|
|
if (vp < &vnode[0] || vp >= &vnode[NR_VNODES])
|
|
panic(__FILE__, "check_vrefs: bad vnode", NO_NUM);
|
|
vp->v_ref_check++;
|
|
|
|
vp= vmp->m_root_node;
|
|
if (vp < &vnode[0] || vp >= &vnode[NR_VNODES])
|
|
panic(__FILE__, "check_vrefs: bad vnode", NO_NUM);
|
|
vp->v_ref_check++;
|
|
}
|
|
|
|
/* Check references */
|
|
bad= 0;
|
|
for (vp = &vnode[0]; vp < &vnode[NR_VNODES]; ++vp)
|
|
{
|
|
if (vp->v_ref_count != vp->v_ref_check)
|
|
{
|
|
printf(
|
|
"Bad reference count for inode %d on device 0x%x: found %d, listed %d\n",
|
|
vp->v_inode_nr, vp->v_dev, vp->v_ref_check,
|
|
vp->v_ref_count);
|
|
printf("last marked at %s, %d\n",
|
|
vp->v_file, vp->v_line);
|
|
bad= 1;
|
|
}
|
|
|
|
/* Also check v_pipe */
|
|
if (vp->v_ref_count != 0)
|
|
{
|
|
ispipe_flag= (vp->v_pipe == I_PIPE);
|
|
ispipe_mode= ((vp->v_mode & I_TYPE) == I_NAMED_PIPE);
|
|
if (ispipe_flag != ispipe_mode)
|
|
{
|
|
printf(
|
|
"Bad v_pipe for inode %d on device 0x%x: found %d, mode 0%o\n",
|
|
vp->v_inode_nr, vp->v_dev, vp->v_pipe,
|
|
vp->v_mode);
|
|
printf("last marked at %s, %d\n",
|
|
vp->v_file, vp->v_line);
|
|
bad= 1;
|
|
}
|
|
}
|
|
}
|
|
return !bad;
|
|
}
|
|
#endif
|