diff options
| author | Pavel Emelyanov <xemul@openvz.org> | 2008-02-07 11:13:21 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 19:42:06 +0300 |
| commit | eccba068915feece2868c502787037e244db3376 (patch) | |
| tree | eac7790a497c1a33c167605a81ba62b22057b99c | |
| parent | 4cbc76eadf56399cd11fb736b33c53aec9caab8c (diff) | |
| download | linux-eccba068915feece2868c502787037e244db3376.tar.xz | |
gfs2: make gfs2_glock.gl_owner_pid be a struct pid *
The gl_owner_pid field is used to get the lock owning task by its pid, so make
it in a proper manner, i.e. by using the struct pid pointer and pid_task()
function.
The pid_task() becomes exported for the gfs2 module.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/gfs2/glock.c | 19 | ||||
| -rw-r--r-- | fs/gfs2/incore.h | 2 | ||||
| -rw-r--r-- | kernel/pid.c | 1 |
3 files changed, 14 insertions, 8 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 82471c82f024..7175a4d06435 100644 --- 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; @@ -632,7 +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); } @@ -653,7 +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); @@ -669,12 +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); } /** @@ -1881,13 +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); diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 4b724e772602..525dcae352d6 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -182,7 +182,7 @@ struct gfs2_glock { unsigned int gl_hash; unsigned int gl_demote_state; /* state requested by remote node */ unsigned long gl_demote_time; /* time of first demote request */ - pid_t gl_owner_pid; + struct pid *gl_owner_pid; unsigned long gl_ip; struct list_head gl_holders; struct list_head gl_waiters1; /* HIF_MUTEX */ diff --git a/kernel/pid.c b/kernel/pid.c index f815455431bf..3b30bccdfcdc 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -368,6 +368,7 @@ struct task_struct * fastcall pid_task(struct pid *pid, enum pid_type type) } return result; } +EXPORT_SYMBOL(pid_task); /* * Must be called under rcu_read_lock() or with tasklist_lock read-held. |