d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Correct the following error: vm_map_pageable() on a COW'ed (post-fork)

Browse Source 
vm_map always failed because vm_map_lookup() looked at
 "vm_map_entry->wired_count" instead of "(vm_map_entry->eflags &
 MAP_ENTRY_USER_WIRED)".  The effect was that many page
 wiring operations by sysctl were (silently) failing.
This commit is contained in:
Alan Cox 1999-11-23 06:51:28 +00:00
parent e1da8747e7
commit 2ed14a92db
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
sys/vm/vm_map.c
View File

@ -2510,10 +2510,11 @@ RetryLookup:;
RETURN(KERN_PROTECTION_FAILURE);
}
if (entry->wired_count && (fault_type & VM_PROT_WRITE) &&
(entry->eflags & MAP_ENTRY_COW) &&
(fault_typea & VM_PROT_OVERRIDE_WRITE) == 0) {
RETURN(KERN_PROTECTION_FAILURE);
if ((entry->eflags & MAP_ENTRY_USER_WIRED) &&
(entry->eflags & MAP_ENTRY_COW) &&
(fault_type & VM_PROT_WRITE) &&
(fault_typea & VM_PROT_OVERRIDE_WRITE) == 0) {
RETURN(KERN_PROTECTION_FAILURE);
}
/*