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Clean up some more problems with freeing busy or wired pages. The

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vfs_bio code was not waiting properly for page state until manipulating
it.
This commit is contained in:
John Dyson 1996-09-14 04:40:33 +00:00
parent a7f8f2ab55
commit 8fdfa820e4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18291
1 changed files with 12 additions and 6 deletions
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18
sys/kern/vfs_bio.c
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@ -623,12 +623,20 @@ vfs_vmio_release(bp)
for (i = 0; i < bp->b_npages; i++) {
m = bp->b_pages[i];
bp->b_pages[i] = NULL;
if (m->flags & PG_WANTED) {
m->flags &= ~PG_WANTED;
wakeup(m);
while ((m->flags & PG_BUSY) || (m->busy != 0)) {
m->flags |= PG_WANTED;
tsleep(m, PVM, "vmiorl", 0);
}
vm_page_unwire(m);
if (m->wire_count == 0 && (m->flags & PG_BUSY) == 0) {
if (m->wire_count == 0) {
if (m->flags & PG_WANTED) {
m->flags &= ~PG_WANTED;
wakeup(m);
}
if (m->valid) {
if(m->dirty == 0)
vm_page_test_dirty(m);
@ -639,14 +647,12 @@ vfs_vmio_release(bp)
(cnt.v_free_count < cnt.v_free_min)) {
if ((m->dirty == 0) &&
(m->hold_count == 0) &&
(m->flags & PG_BUSY) == 0 &&
(m->busy == 0))
vm_page_cache(m);
else
vm_page_deactivate(m);
}
} else if ((m->hold_count == 0) &&
((m->flags & PG_BUSY) == 0) &&
(m->busy == 0)) {
vm_page_protect(m, VM_PROT_NONE);
vm_page_free(m);