Author: kib
Date: Tue Jan 20 11:27:45 2009
New Revision: 187467
URL: http://svn.freebsd.org/changeset/base/187467
Log:
FFS puts the extended attributes blocks at the negative blocks for the
vnode, from -1 down. When vinvalbuf(vp, V_ALT) is done for the vnode, it
incorrectly does vm_object_page_remove(0, 0), removing all pages from
the underlying vm object, not only the pages that back the extended
attributes data.
Change vinvalbuf() to not remove any pages from the object when
V_NORMAL or V_ALT are specified. Instead, the only in-tree caller
in ffs_inode.c:ffs_truncate() that specifies V_ALT explicitely
removes the corresponding page range. The V_NORMAL caller
does vnode_pager_setsize(vp, 0) immediately after the call to
vinvalbuf(V_NORMAL) already.
Reported by: csjp
Reviewed by: ups
MFC after: 3 weeks
Modified:
head/sys/kern/vfs_subr.c
head/sys/ufs/ffs/ffs_inode.c
Modified: head/sys/kern/vfs_subr.c
==============================================================================
--- head/sys/kern/vfs_subr.c Tue Jan 20 08:13:45 2009 (r187466)
+++ head/sys/kern/vfs_subr.c Tue Jan 20 11:27:45 2009 (r187467)
@@ -1156,7 +1156,7 @@ bufobj_invalbuf(struct bufobj *bo, int f
/*
* Destroy the copy in the VM cache, too.
*/
- if (bo->bo_object != NULL) {
+ if (bo->bo_object != NULL && (flags & (V_ALT | V_NORMAL)) == 0) {
VM_OBJECT_LOCK(bo->bo_object);
vm_object_page_remove(bo->bo_object, 0, 0,
(flags & V_SAVE) ? TRUE : FALSE);
Modified: head/sys/ufs/ffs/ffs_inode.c
==============================================================================
--- head/sys/ufs/ffs/ffs_inode.c Tue Jan 20 08:13:45 2009
(r187466)
+++ head/sys/ufs/ffs/ffs_inode.c Tue Jan 20 11:27:45 2009
(r187467)
@@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$");
#include <vm/vm.h>
#include <vm/vm_extern.h>
+#include <vm/vm_object.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
@@ -151,6 +152,7 @@ ffs_truncate(vp, length, flags, cred, td
struct fs *fs;
struct buf *bp;
struct ufsmount *ump;
+ vm_object_t object;
int needextclean, softdepslowdown, extblocks;
int offset, size, level, nblocks;
int i, error, allerror;
@@ -205,6 +207,13 @@ ffs_truncate(vp, length, flags, cred, td
(void) chkdq(ip, -extblocks, NOCRED, 0);
#endif
vinvalbuf(vp, V_ALT, 0, 0);
+ if ((object = vp->v_object) != NULL) {
+ VM_OBJECT_LOCK(object);
+ vm_object_page_remove(object,
+ OFF_TO_IDX(lblktosize(fs, -extblocks)), 0,
+ FALSE);
+ VM_OBJECT_UNLOCK(object);
+ }
ip->i_din2->di_extsize = 0;
for (i = 0; i < NXADDR; i++) {
oldblks[i] = ip->i_din2->di_extb[i];
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