if the process was REVIVING. (susp_count doesn't count those processes.) this together with dev_io SELECT suspend side effect for asynch. character devices solves the hanging pipe bug. or at last vastly improves it. added sanity checks, turned off by default. made the {NOT_,}{SUSPENDING,REVIVING} constants weirder to help sanity checking.
249 lines
6.2 KiB
C
249 lines
6.2 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>
|
|
|
|
/* Is vnode pointer reasonable? */
|
|
#define SANEVP(v) ((((v) >= &vnode[0] && (v) < &vnode[NR_VNODES])))
|
|
|
|
#define BADVP(v, f, l) printf("%s:%d: bad vp 0x%x\n", f, l, v)
|
|
|
|
/* vp check that returns 0 for use in check_vrefs() */
|
|
#define CHECKVN(v) if(!SANEVP(v)) { \
|
|
BADVP(v, __FILE__, __LINE__); \
|
|
return 0; \
|
|
}
|
|
|
|
/* vp check that panics */
|
|
#define ASSERTVP(v) if(!SANEVP(v)) { \
|
|
BADVP(v, __FILE__, __LINE__); panic("vfs", "bad vp", NO_NUM); }
|
|
|
|
/*===========================================================================*
|
|
* 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.
|
|
*/
|
|
ASSERTVP(vp);
|
|
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.
|
|
*/
|
|
ASSERTVP(vp);
|
|
|
|
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 */
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
#define REFVP(v) { vp = (v); CHECKVN(v); vp->v_ref_check++; }
|
|
|
|
#if DO_SANITYCHECKS
|
|
/*===========================================================================*
|
|
* 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;
|
|
if(rfp->fp_rd) REFVP(rfp->fp_rd);
|
|
if(rfp->fp_wd) REFVP(rfp->fp_wd);
|
|
}
|
|
|
|
/* Count references from filedescriptors */
|
|
for (f = &filp[0]; f < &filp[NR_FILPS]; f++)
|
|
{
|
|
if (f->filp_count == 0)
|
|
continue;
|
|
REFVP(f->filp_vno);
|
|
}
|
|
|
|
/* Count references to mount points */
|
|
for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp)
|
|
{
|
|
if (vmp->m_dev == NO_DEV)
|
|
continue;
|
|
REFVP(vmp->m_root_node);
|
|
if(vmp->m_mounted_on)
|
|
REFVP(vmp->m_mounted_on);
|
|
}
|
|
|
|
/* 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
|