FRV: Handle update_mmu_cache() being called when current->mm is NULL [try #2]

[linux-2.6-omap-h63xx.git] / fs / gfs2 / glock.c

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 80e09c50590a52ed1a6e77c47ea59459da4b1bde..7175a4d064356f6f36860ea57d24feed1acb3d0e 100644 (file)
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -334,7 +334,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
        gl->gl_state = LM_ST_UNLOCKED;
        gl->gl_demote_state = LM_ST_EXCLUSIVE;
        gl->gl_hash = hash;
-       gl->gl_owner_pid = 0;
+       gl->gl_owner_pid = NULL;
        gl->gl_ip = 0;
        gl->gl_ops = glops;
        gl->gl_req_gh = NULL;
@@ -399,7 +399,7 @@ void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
        INIT_LIST_HEAD(&gh->gh_list);
        gh->gh_gl = gl;
        gh->gh_ip = (unsigned long)__builtin_return_address(0);
-       gh->gh_owner_pid = current->pid;
+       gh->gh_owner_pid = get_pid(task_pid(current));
        gh->gh_state = state;
        gh->gh_flags = flags;
        gh->gh_error = 0;
@@ -433,6 +433,7 @@ void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *
 
 void gfs2_holder_uninit(struct gfs2_holder *gh)
 {
+       put_pid(gh->gh_owner_pid);
        gfs2_glock_put(gh->gh_gl);
        gh->gh_gl = NULL;
        gh->gh_ip = 0;
@@ -631,7 +632,7 @@ static void gfs2_glmutex_lock(struct gfs2_glock *gl)
                wait_on_holder(&gh);
                gfs2_holder_uninit(&gh);
        } else {
-               gl->gl_owner_pid = current->pid;
+               gl->gl_owner_pid = get_pid(task_pid(current));
                gl->gl_ip = (unsigned long)__builtin_return_address(0);
                spin_unlock(&gl->gl_spin);
        }
@@ -652,7 +653,7 @@ static int gfs2_glmutex_trylock(struct gfs2_glock *gl)
        if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
                acquired = 0;
        } else {
-               gl->gl_owner_pid = current->pid;
+               gl->gl_owner_pid = get_pid(task_pid(current));
                gl->gl_ip = (unsigned long)__builtin_return_address(0);
        }
        spin_unlock(&gl->gl_spin);
@@ -668,12 +669,17 @@ static int gfs2_glmutex_trylock(struct gfs2_glock *gl)
 
 static void gfs2_glmutex_unlock(struct gfs2_glock *gl)
 {
+       struct pid *pid;
+
        spin_lock(&gl->gl_spin);
        clear_bit(GLF_LOCK, &gl->gl_flags);
-       gl->gl_owner_pid = 0;
+       pid = gl->gl_owner_pid;
+       gl->gl_owner_pid = NULL;
        gl->gl_ip = 0;
        run_queue(gl);
        spin_unlock(&gl->gl_spin);
+
+       put_pid(pid);
 }
 
 /**
@@ -1045,7 +1051,7 @@ static int glock_wait_internal(struct gfs2_holder *gh)
 }
 
 static inline struct gfs2_holder *
-find_holder_by_owner(struct list_head *head, pid_t pid)
+find_holder_by_owner(struct list_head *head, struct pid *pid)
 {
        struct gfs2_holder *gh;
 
@@ -1082,7 +1088,7 @@ static void add_to_queue(struct gfs2_holder *gh)
        struct gfs2_glock *gl = gh->gh_gl;
        struct gfs2_holder *existing;
 
-       BUG_ON(!gh->gh_owner_pid);
+       BUG_ON(gh->gh_owner_pid == NULL);
        if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags))
                BUG();
 
@@ -1092,12 +1098,14 @@ static void add_to_queue(struct gfs2_holder *gh)
                if (existing) {
                        print_symbol(KERN_WARNING "original: %s\n", 
                                     existing->gh_ip);
-                       printk(KERN_INFO "pid : %d\n", existing->gh_owner_pid);
+                       printk(KERN_INFO "pid : %d\n",
+                                       pid_nr(existing->gh_owner_pid));
                        printk(KERN_INFO "lock type : %d lock state : %d\n",
                               existing->gh_gl->gl_name.ln_type, 
                               existing->gh_gl->gl_state);
                        print_symbol(KERN_WARNING "new: %s\n", gh->gh_ip);
-                       printk(KERN_INFO "pid : %d\n", gh->gh_owner_pid);
+                       printk(KERN_INFO "pid : %d\n",
+                                       pid_nr(gh->gh_owner_pid));
                        printk(KERN_INFO "lock type : %d lock state : %d\n",
                               gl->gl_name.ln_type, gl->gl_state);
                        BUG();
@@ -1798,8 +1806,9 @@ static int dump_holder(struct glock_iter *gi, char *str,
 
        print_dbg(gi, "  %s\n", str);
        if (gh->gh_owner_pid) {
-               print_dbg(gi, "    owner = %ld ", (long)gh->gh_owner_pid);
-               gh_owner = find_task_by_pid(gh->gh_owner_pid);
+               print_dbg(gi, "    owner = %ld ",
+                               (long)pid_nr(gh->gh_owner_pid));
+               gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID);
                if (gh_owner)
                        print_dbg(gi, "(%s)\n", gh_owner->comm);
                else
@@ -1877,13 +1886,13 @@ static int dump_glock(struct glock_iter *gi, struct gfs2_glock *gl)
        print_dbg(gi, "  gl_ref = %d\n", atomic_read(&gl->gl_ref));
        print_dbg(gi, "  gl_state = %u\n", gl->gl_state);
        if (gl->gl_owner_pid) {
-               gl_owner = find_task_by_pid(gl->gl_owner_pid);
+               gl_owner = pid_task(gl->gl_owner_pid, PIDTYPE_PID);
                if (gl_owner)
                        print_dbg(gi, "  gl_owner = pid %d (%s)\n",
-                                 gl->gl_owner_pid, gl_owner->comm);
+                                 pid_nr(gl->gl_owner_pid), gl_owner->comm);
                else
                        print_dbg(gi, "  gl_owner = %d (ended)\n",
-                                 gl->gl_owner_pid);
+                                 pid_nr(gl->gl_owner_pid));
        } else
                print_dbg(gi, "  gl_owner = -1\n");
        print_dbg(gi, "  gl_ip = %lu\n", gl->gl_ip);