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. new kernel call sysctl for generic unprivileged system operations;

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now used for printing diagnostic messages through the kernel message
   buffer. this lets processes print diagnostics without sending messages
   to tty and log directly, simplifying the message protocol a lot and
   reducing difficulties with deadlocks and other situations in which
   diagnostics are blackholed (e.g. grants don't work). this makes
   DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty
   and log still accept the codes for 'old' binaries. This also simplifies
   diagnostics in several servers and drivers - only tty needs its own
   kputc() now.
 . simplifications in vfs, and some effort to get the vnode references
   right (consistent) even during shutdown. m_mounted_on is now NULL
   for root filesystems (!) (the original and new root), a less awkward
   special case than 'm_mounted_on == m_root_node'. root now has exactly
   one reference, to root, if no files are open, just like all other
   filesystems. m_driver_e is unused.
This commit is contained in:
Ben Gras
2009-01-26 17:43:59 +00:00
parent 4984a86f32
commit 3cc092ff06
38 changed files with 243 additions and 531 deletions
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63
servers/vfs/vnode.c
View File

@@ -19,6 +19,20 @@
#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 *
@@ -72,11 +86,7 @@ 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;
}
ASSERTVP(vp);
vp->v_ref_count++;
}
@@ -89,17 +99,7 @@ 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);
}
ASSERTVP(vp);
if (vp->v_ref_count > 1)
{
@@ -167,6 +167,8 @@ int line;
}
#endif
#define REFVP(v) { vp = (v); CHECKVN(v); vp->v_ref_check++; }
/*===========================================================================*
* check_vrefs *
*===========================================================================*/
@@ -187,16 +189,8 @@ PUBLIC int check_vrefs()
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++;
REFVP(rfp->fp_rd);
REFVP(rfp->fp_wd);
}
/* Count references from filedescriptors */
@@ -204,10 +198,7 @@ PUBLIC int check_vrefs()
{
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++;
REFVP(f->filp_vno);
}
/* Count references to mount points */
@@ -215,15 +206,9 @@ PUBLIC int check_vrefs()
{
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++;
REFVP(vmp->m_root_node);
if(vmp->m_mounted_on)
REFVP(vmp->m_mounted_on);
}
/* Check references */