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fs: dlm: fix DLM_IFL_CB_PENDING gets overwritten

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This patch introduce a new internal flag per lkb value to handle
internal flags which are handled not on wire. The current lkb internal
flags stored as lkb->lkb_flags are split in upper and lower bits, the
lower bits are used to share internal flags over wire for other cluster
wide lkb copies on other nodes.

In commit 61bed0baa4 ("fs: dlm: use a non-static queue for callbacks")
we introduced a new internal flag for pending callbacks for the dlm
callback queue. This flag is protected by the lkb->lkb_cb_lock lock.
This patch overlooked that on dlm receive path and the mentioned upper
and lower bits, that dlm will read the flags, mask it and write it
back. As example receive_flags() in fs/dlm/lock.c. This flag
manipulation is not done atomically and is not protected by
lkb->lkb_cb_lock. This has unknown side effects of the current callback
handling.

In future we should move to set/clear/test bit functionality and avoid
read, mask and writing back flag values. In later patches we will move
the upper parts to the new introduced internal lkb flags which are not
shared between other cluster nodes to the new non shared internal flag
field to avoid similar issues.

Cc: stable@vger.kernel.org
Fixes: 61bed0baa4 ("fs: dlm: use a non-static queue for callbacks")
Reported-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2023-03-06 15:48:08 -05:00 committed by David Teigland
parent fe15c26ee2
commit a034c1370d
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/dlm/ast.c
View File

@ -45,7 +45,7 @@ void dlm_purge_lkb_callbacks(struct dlm_lkb *lkb)
kref_put(&cb->ref, dlm_release_callback);
}
lkb->lkb_flags &= ~DLM_IFL_CB_PENDING;
clear_bit(DLM_IFL_CB_PENDING_BIT, &lkb->lkb_iflags);
/* invalidate */
dlm_callback_set_last_ptr(&lkb->lkb_last_cast, NULL);
@ -103,10 +103,9 @@ int dlm_enqueue_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
cb->sb_status = status;
cb->sb_flags = (sbflags & 0x000000FF);
kref_init(&cb->ref);
if (!(lkb->lkb_flags & DLM_IFL_CB_PENDING)) {
lkb->lkb_flags |= DLM_IFL_CB_PENDING;
if (!test_and_set_bit(DLM_IFL_CB_PENDING_BIT, &lkb->lkb_iflags))
rv = DLM_ENQUEUE_CALLBACK_NEED_SCHED;
}
list_add_tail(&cb->list, &lkb->lkb_callbacks);
if (flags & DLM_CB_CAST)
@ -209,7 +208,7 @@ void dlm_callback_work(struct work_struct *work)
spin_lock(&lkb->lkb_cb_lock);
rv = dlm_dequeue_lkb_callback(lkb, &cb);
if (rv == DLM_DEQUEUE_CALLBACK_EMPTY) {
lkb->lkb_flags &= ~DLM_IFL_CB_PENDING;
clear_bit(DLM_IFL_CB_PENDING_BIT, &lkb->lkb_iflags);
spin_unlock(&lkb->lkb_cb_lock);
break;
}

5
fs/dlm/dlm_internal.h
View File

@ -211,7 +211,9 @@ struct dlm_args {
#endif
#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
#define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */
#define DLM_IFL_CB_PENDING 0x04000000
#define DLM_IFL_CB_PENDING_BIT 0
/* least significant 2 bytes are message changed, they are full transmitted
* but at receive side only the 2 bytes LSB will be set.
*
@ -246,6 +248,7 @@ struct dlm_lkb {
uint32_t lkb_exflags; /* external flags from caller */
uint32_t lkb_sbflags; /* lksb flags */
uint32_t lkb_flags; /* internal flags */
unsigned long lkb_iflags; /* internal flags */
uint32_t lkb_lvbseq; /* lvb sequence number */
int8_t lkb_status; /* granted, waiting, convert */

2
fs/dlm/user.c
View File

@ -884,7 +884,7 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
goto try_another;
case DLM_DEQUEUE_CALLBACK_LAST:
list_del_init(&lkb->lkb_cb_list);
lkb->lkb_flags &= ~DLM_IFL_CB_PENDING;
clear_bit(DLM_IFL_CB_PENDING_BIT, &lkb->lkb_iflags);
break;
case DLM_DEQUEUE_CALLBACK_SUCCESS:
break;