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FFS puts the extended attributes blocks at the negative blocks for the

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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
This commit is contained in:
Konstantin Belousov 2009-01-20 11:27:45 +00:00
parent 58c1607e03
commit 9316467d05
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=187467
2 changed files with 10 additions and 1 deletions
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2
sys/kern/vfs_subr.c
View File

@ -1156,7 +1156,7 @@ bufobj_invalbuf(struct bufobj *bo, int flags, int slpflag, int slptimeo)
/*
* 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);

9
sys/ufs/ffs/ffs_inode.c
View File

@ -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];