spin_unlock(&lockres->l_lock);
}
-#define user_log_dlm_error(_func, _stat, _lockres) do { \
- mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
- "resource %s: %s\n", dlm_errname(_stat), _func, \
- _lockres->l_name, dlm_errmsg(_stat)); \
+#define user_log_dlm_error(_func, _stat, _lockres) do { \
+ mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
+ "resource %.*s: %s\n", dlm_errname(_stat), _func, \
+ _lockres->l_namelen, _lockres->l_name, dlm_errmsg(_stat)); \
} while (0)
/* WARNING: This function lives in a world where the only three lock
struct user_lock_res *lockres = opaque;
struct dlm_lockstatus *lksb;
- mlog(0, "AST fired for lockres %s\n", lockres->l_name);
+ mlog(0, "AST fired for lockres %.*s\n", lockres->l_namelen,
+ lockres->l_name);
spin_lock(&lockres->l_lock);
lksb = &(lockres->l_lksb);
if (lksb->status != DLM_NORMAL) {
- mlog(ML_ERROR, "lksb status value of %u on lockres %s\n",
- lksb->status, lockres->l_name);
+ mlog(ML_ERROR, "lksb status value of %u on lockres %.*s\n",
+ lksb->status, lockres->l_namelen, lockres->l_name);
spin_unlock(&lockres->l_lock);
return;
}
+ mlog_bug_on_msg(lockres->l_requested == LKM_IVMODE,
+ "Lockres %.*s, requested ivmode. flags 0x%x\n",
+ lockres->l_namelen, lockres->l_name, lockres->l_flags);
+
/* we're downconverting. */
if (lockres->l_requested < lockres->l_level) {
if (lockres->l_requested <=
BUG();
}
-static void user_dlm_unblock_lock(void *opaque);
+static void user_dlm_unblock_lock(struct work_struct *work);
static void __user_dlm_queue_lockres(struct user_lock_res *lockres)
{
if (!(lockres->l_flags & USER_LOCK_QUEUED)) {
user_dlm_grab_inode_ref(lockres);
- INIT_WORK(&lockres->l_work, user_dlm_unblock_lock,
- lockres);
+ INIT_WORK(&lockres->l_work, user_dlm_unblock_lock);
queue_work(user_dlm_worker, &lockres->l_work);
lockres->l_flags |= USER_LOCK_QUEUED;
{
struct user_lock_res *lockres = opaque;
- mlog(0, "Blocking AST fired for lockres %s. Blocking level %d\n",
- lockres->l_name, level);
+ mlog(0, "Blocking AST fired for lockres %.*s. Blocking level %d\n",
+ lockres->l_namelen, lockres->l_name, level);
spin_lock(&lockres->l_lock);
lockres->l_flags |= USER_LOCK_BLOCKED;
{
struct user_lock_res *lockres = opaque;
- mlog(0, "UNLOCK AST called on lock %s\n", lockres->l_name);
+ mlog(0, "UNLOCK AST called on lock %.*s\n", lockres->l_namelen,
+ lockres->l_name);
- if (status != DLM_NORMAL)
+ if (status != DLM_NORMAL && status != DLM_CANCELGRANT)
mlog(ML_ERROR, "Dlm returns status %d\n", status);
spin_lock(&lockres->l_lock);
- if (lockres->l_flags & USER_LOCK_IN_TEARDOWN)
+ /* The teardown flag gets set early during the unlock process,
+ * so test the cancel flag to make sure that this ast isn't
+ * for a concurrent cancel. */
+ if (lockres->l_flags & USER_LOCK_IN_TEARDOWN
+ && !(lockres->l_flags & USER_LOCK_IN_CANCEL)) {
lockres->l_level = LKM_IVMODE;
- else {
+ } else if (status == DLM_CANCELGRANT) {
+ /* We tried to cancel a convert request, but it was
+ * already granted. Don't clear the busy flag - the
+ * ast should've done this already. */
+ BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
+ lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
+ goto out_noclear;
+ } else {
+ BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
+ /* Cancel succeeded, we want to re-queue */
lockres->l_requested = LKM_IVMODE; /* cancel an
* upconvert
* request. */
lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
/* we want the unblock thread to look at it again
* now. */
- __user_dlm_queue_lockres(lockres);
+ if (lockres->l_flags & USER_LOCK_BLOCKED)
+ __user_dlm_queue_lockres(lockres);
}
lockres->l_flags &= ~USER_LOCK_BUSY;
+out_noclear:
spin_unlock(&lockres->l_lock);
wake_up(&lockres->l_event);
iput(inode);
}
-static void user_dlm_unblock_lock(void *opaque)
+static void user_dlm_unblock_lock(struct work_struct *work)
{
int new_level, status;
- struct user_lock_res *lockres = (struct user_lock_res *) opaque;
+ struct user_lock_res *lockres =
+ container_of(work, struct user_lock_res, l_work);
struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
- mlog(0, "processing lockres %s\n", lockres->l_name);
+ mlog(0, "processing lockres %.*s\n", lockres->l_namelen,
+ lockres->l_name);
spin_lock(&lockres->l_lock);
- BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
- BUG_ON(!(lockres->l_flags & USER_LOCK_QUEUED));
+ mlog_bug_on_msg(!(lockres->l_flags & USER_LOCK_QUEUED),
+ "Lockres %.*s, flags 0x%x\n",
+ lockres->l_namelen, lockres->l_name, lockres->l_flags);
- /* notice that we don't clear USER_LOCK_BLOCKED here. That's
- * for user_ast to do. */
+ /* notice that we don't clear USER_LOCK_BLOCKED here. If it's
+ * set, we want user_ast clear it. */
lockres->l_flags &= ~USER_LOCK_QUEUED;
+ /* It's valid to get here and no longer be blocked - if we get
+ * several basts in a row, we might be queued by the first
+ * one, the unblock thread might run and clear the queued
+ * flag, and finally we might get another bast which re-queues
+ * us before our ast for the downconvert is called. */
+ if (!(lockres->l_flags & USER_LOCK_BLOCKED)) {
+ spin_unlock(&lockres->l_lock);
+ goto drop_ref;
+ }
+
if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
- mlog(0, "lock is in teardown so we do nothing\n");
spin_unlock(&lockres->l_lock);
goto drop_ref;
}
if (lockres->l_flags & USER_LOCK_BUSY) {
- mlog(0, "BUSY flag detected...\n");
if (lockres->l_flags & USER_LOCK_IN_CANCEL) {
spin_unlock(&lockres->l_lock);
goto drop_ref;
LKM_CANCEL,
user_unlock_ast,
lockres);
- if (status == DLM_CANCELGRANT) {
- /* If we got this, then the ast was fired
- * before we could cancel. We cleanup our
- * state, and restart the function. */
- spin_lock(&lockres->l_lock);
- lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
- spin_unlock(&lockres->l_lock);
- } else if (status != DLM_NORMAL)
+ if (status != DLM_NORMAL)
user_log_dlm_error("dlmunlock", status, lockres);
goto drop_ref;
}
&lockres->l_lksb,
LKM_CONVERT|LKM_VALBLK,
lockres->l_name,
+ lockres->l_namelen,
user_ast,
lockres,
user_bast);
if (level != LKM_EXMODE &&
level != LKM_PRMODE) {
- mlog(ML_ERROR, "lockres %s: invalid request!\n",
- lockres->l_name);
+ mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
+ lockres->l_namelen, lockres->l_name);
status = -EINVAL;
goto bail;
}
- mlog(0, "lockres %s: asking for %s lock, passed flags = 0x%x\n",
- lockres->l_name,
- (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE",
- lkm_flags);
+ mlog(0, "lockres %.*s: asking for %s lock, passed flags = 0x%x\n",
+ lockres->l_namelen, lockres->l_name,
+ (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE",
+ lkm_flags);
again:
if (signal_pending(current)) {
BUG_ON(level == LKM_IVMODE);
BUG_ON(level == LKM_NLMODE);
- mlog(0, "lock %s, get lock from %d to level = %d\n",
- lockres->l_name, lockres->l_level, level);
-
/* call dlm_lock to upgrade lock now */
status = dlmlock(dlm,
level,
&lockres->l_lksb,
local_flags,
lockres->l_name,
+ lockres->l_namelen,
user_ast,
lockres,
user_bast);
goto bail;
}
- mlog(0, "lock %s, successfull return from dlmlock\n",
- lockres->l_name);
-
user_wait_on_busy_lock(lockres);
goto again;
}
user_dlm_inc_holders(lockres, level);
spin_unlock(&lockres->l_lock);
- mlog(0, "lockres %s: Got %s lock!\n", lockres->l_name,
- (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE");
-
status = 0;
bail:
return status;
{
if (level != LKM_EXMODE &&
level != LKM_PRMODE) {
- mlog(ML_ERROR, "lockres %s: invalid request!\n", lockres->l_name);
+ mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
+ lockres->l_namelen, lockres->l_name);
return;
}
- mlog(0, "lockres %s: dropping %s lock\n", lockres->l_name,
- (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE");
-
spin_lock(&lockres->l_lock);
user_dlm_dec_holders(lockres, level);
__user_dlm_cond_queue_lockres(lockres);
memcpy(lockres->l_name,
dentry->d_name.name,
dentry->d_name.len);
+ lockres->l_namelen = dentry->d_name.len;
}
int user_dlm_destroy_lock(struct user_lock_res *lockres)
int status = -EBUSY;
struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
- mlog(0, "asked to destroy %s\n", lockres->l_name);
+ mlog(0, "asked to destroy %.*s\n", lockres->l_namelen, lockres->l_name);
spin_lock(&lockres->l_lock);
- while (lockres->l_flags & USER_LOCK_BUSY) {
+ if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
spin_unlock(&lockres->l_lock);
+ return 0;
+ }
- mlog(0, "lock %s is busy\n", lockres->l_name);
+ lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
+
+ while (lockres->l_flags & USER_LOCK_BUSY) {
+ spin_unlock(&lockres->l_lock);
user_wait_on_busy_lock(lockres);
if (lockres->l_ro_holders || lockres->l_ex_holders) {
spin_unlock(&lockres->l_lock);
- mlog(0, "lock %s has holders\n", lockres->l_name);
goto bail;
}
status = 0;
if (!(lockres->l_flags & USER_LOCK_ATTACHED)) {
spin_unlock(&lockres->l_lock);
- mlog(0, "lock %s is not attached\n", lockres->l_name);
goto bail;
}
lockres->l_flags &= ~USER_LOCK_ATTACHED;
lockres->l_flags |= USER_LOCK_BUSY;
- lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
spin_unlock(&lockres->l_lock);
- mlog(0, "unlocking lockres %s\n", lockres->l_name);
status = dlmunlock(dlm,
&lockres->l_lksb,
LKM_VALBLK,
u32 dlm_key;
char *domain;
- domain = kmalloc(name->len + 1, GFP_KERNEL);
+ domain = kmalloc(name->len + 1, GFP_NOFS);
if (!domain) {
mlog_errno(-ENOMEM);
return ERR_PTR(-ENOMEM);
git://git.onelab.eu / linux-2.6.git / blobdiff