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Add KTR_VFS traces to track modifications to a vnode's writecount.

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This commit is contained in:
John Baldwin 2012-03-08 20:27:20 +00:00
parent 44ad547522
commit b47f624183
5 changed files with 26 additions and 3 deletions
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4
sys/fs/unionfs/union_subr.c
View File

@ -952,6 +952,8 @@ unionfs_vn_create_on_upper(struct vnode **vpp, struct vnode *udvp,
goto unionfs_vn_create_on_upper_free_out1;
}
vp->v_writecount++;
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
vp->v_writecount);
*vpp = vp;
unionfs_vn_create_on_upper_free_out1:
@ -1087,6 +1089,8 @@ unionfs_copyfile(struct unionfs_node *unp, int docopy, struct ucred *cred,
}
VOP_CLOSE(uvp, FWRITE, cred, td);
uvp->v_writecount--;
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d", __func__, uvp,
uvp->v_writecount);
vn_finished_write(mp);

10
sys/kern/vfs_syscalls.c
View File

@ -4591,16 +4591,22 @@ sys_fhopen(td, uap)
if (error)
goto bad;
if (fmode & FWRITE)
if (fmode & FWRITE) {
vp->v_writecount++;
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d",
__func__, vp, vp->v_writecount);
}
/*
* end of vn_open code
*/
if ((error = falloc(td, &nfp, &indx, fmode)) != 0) {
if (fmode & FWRITE)
if (fmode & FWRITE) {
vp->v_writecount--;
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
__func__, vp, vp->v_writecount);
}
goto bad;
}
/* An extra reference on `nfp' has been held for us by falloc(). */

7
sys/kern/vfs_vnops.c
View File

@ -245,8 +245,11 @@ restart:
if ((error = VOP_OPEN(vp, fmode, cred, td, fp)) != 0)
goto bad;
if (fmode & FWRITE)
if (fmode & FWRITE) {
vp->v_writecount++;
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d",
__func__, vp, vp->v_writecount);
}
*flagp = fmode;
ASSERT_VOP_LOCKED(vp, "vn_open_cred");
if (!mpsafe)
@ -309,6 +312,8 @@ vn_close(vp, flags, file_cred, td)
VNASSERT(vp->v_writecount > 0, vp,
("vn_close: negative writecount"));
vp->v_writecount--;
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
__func__, vp, vp->v_writecount);
}
error = VOP_CLOSE(vp, flags, file_cred, td);
vput(vp);

2
sys/ufs/ufs/ufs_extattr.c
View File

@ -335,6 +335,8 @@ ufs_extattr_enable_with_open(struct ufsmount *ump, struct vnode *vp,
}
vp->v_writecount++;
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
vp->v_writecount);
vref(vp);

6
sys/vm/vnode_pager.c
View File

@ -272,6 +272,8 @@ vnode_pager_dealloc(object)
if (object->un_pager.vnp.writemappings > 0) {
object->un_pager.vnp.writemappings = 0;
vp->v_writecount--;
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
__func__, vp, vp->v_writecount);
}
vp->v_object = NULL;
vp->v_vflag &= ~VV_TEXT;
@ -1241,9 +1243,13 @@ vnode_pager_update_writecount(vm_object_t object, vm_offset_t start,
if (old_wm == 0 && object->un_pager.vnp.writemappings != 0) {
ASSERT_VOP_ELOCKED(vp, "v_writecount inc");
vp->v_writecount++;
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d",
__func__, vp, vp->v_writecount);
} else if (old_wm != 0 && object->un_pager.vnp.writemappings == 0) {
ASSERT_VOP_ELOCKED(vp, "v_writecount dec");
vp->v_writecount--;
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
__func__, vp, vp->v_writecount);
}
VM_OBJECT_UNLOCK(object);
}