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authorDavid Teigland <teigland@redhat.com>2015-08-25 20:51:44 +0300
committerDavid Teigland <teigland@redhat.com>2015-08-25 22:41:50 +0300
commitb96f465035f9fae83c1d8de3e80eecfe6877608c (patch)
tree75659c1ba50859bf0b5537972f94f439f2d0867e /fs/dlm
parent18df8a87badac0ab05679df9bd44b5033e30d97c (diff)
downloadlinux-b96f465035f9fae83c1d8de3e80eecfe6877608c.tar.xz
dlm: fix lvb copy for user locks
For a userland lock request, the previous and current lock modes are used to decide when the lvb should be copied back to the user. The wrong previous value was used, so that it always matched the current value. This caused the lvb to be copied back to the user in the wrong cases. Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/user.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index fb85f32e9eca..35960502ec8d 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -785,6 +785,7 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
DECLARE_WAITQUEUE(wait, current);
struct dlm_callback cb;
int rv, resid, copy_lvb = 0;
+ int old_mode, new_mode;
if (count == sizeof(struct dlm_device_version)) {
rv = copy_version_to_user(buf, count);
@@ -841,6 +842,9 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_cb_list);
+ /* rem_lkb_callback sets a new lkb_last_cast */
+ old_mode = lkb->lkb_last_cast.mode;
+
rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid);
if (rv < 0) {
/* this shouldn't happen; lkb should have been removed from
@@ -864,9 +868,6 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
}
if (cb.flags & DLM_CB_CAST) {
- int old_mode, new_mode;
-
- old_mode = lkb->lkb_last_cast.mode;
new_mode = cb.mode;
if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr &&