perf_event: Provide vmalloc() based mmap() backing

[safe/jmp/linux-2.6] / kernel / trace / blktrace.c

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 7bd6a98..3eb159c 100644 (file)
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/debugfs.h>
+#include <linux/smp_lock.h>
 #include <linux/time.h>
 #include <linux/uaccess.h>
 
@@ -64,13 +65,15 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action,
 {
        struct blk_io_trace *t;
        struct ring_buffer_event *event = NULL;
+       struct ring_buffer *buffer = NULL;
        int pc = 0;
        int cpu = smp_processor_id();
        bool blk_tracer = blk_tracer_enabled;
 
        if (blk_tracer) {
+               buffer = blk_tr->buffer;
                pc = preempt_count();
-               event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK,
+               event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
                                                  sizeof(*t) + len,
                                                  0, pc);
                if (!event)
@@ -95,7 +98,7 @@ record_it:
                memcpy((void *) t + sizeof(*t), data, len);
 
                if (blk_tracer)
-                       trace_buffer_unlock_commit(blk_tr, event, 0, pc);
+                       trace_buffer_unlock_commit(buffer, event, 0, pc);
        }
 }
 
@@ -178,6 +181,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
 {
        struct task_struct *tsk = current;
        struct ring_buffer_event *event = NULL;
+       struct ring_buffer *buffer = NULL;
        struct blk_io_trace *t;
        unsigned long flags = 0;
        unsigned long *sequence;
@@ -203,8 +207,9 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
        if (blk_tracer) {
                tracing_record_cmdline(current);
 
+               buffer = blk_tr->buffer;
                pc = preempt_count();
-               event = trace_buffer_lock_reserve(blk_tr, TRACE_BLK,
+               event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
                                                  sizeof(*t) + pdu_len,
                                                  0, pc);
                if (!event)
@@ -251,7 +256,7 @@ record_it:
                        memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
 
                if (blk_tracer) {
-                       trace_buffer_unlock_commit(blk_tr, event, 0, pc);
+                       trace_buffer_unlock_commit(buffer, event, 0, pc);
                        return;
                }
        }
@@ -266,8 +271,8 @@ static void blk_trace_free(struct blk_trace *bt)
 {
        debugfs_remove(bt->msg_file);
        debugfs_remove(bt->dropped_file);
-       debugfs_remove(bt->dir);
        relay_close(bt->rchan);
+       debugfs_remove(bt->dir);
        free_percpu(bt->sequence);
        free_percpu(bt->msg_data);
        kfree(bt);
@@ -377,18 +382,8 @@ static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
 
 static int blk_remove_buf_file_callback(struct dentry *dentry)
 {
-       struct dentry *parent = dentry->d_parent;
        debugfs_remove(dentry);
 
-       /*
-       * this will fail for all but the last file, but that is ok. what we
-       * care about is the top level buts->name directory going away, when
-       * the last trace file is gone. Then we don't have to rmdir() that
-       * manually on trace stop, so it nicely solves the issue with
-       * force killing of running traces.
-       */
-
-       debugfs_remove(parent);
        return 0;
 }
 
@@ -669,12 +664,12 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
 
        if (blk_pc_request(rq)) {
                what |= BLK_TC_ACT(BLK_TC_PC);
-               __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
-                               rq->cmd_len, rq->cmd);
+               __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
+                               what, rq->errors, rq->cmd_len, rq->cmd);
        } else  {
                what |= BLK_TC_ACT(BLK_TC_FS);
-               __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
-                               rw, what, rq->errors, 0, NULL);
+               __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw,
+                               what, rq->errors, 0, NULL);
        }
 }
 
@@ -881,11 +876,11 @@ void blk_add_driver_data(struct request_queue *q,
                return;
 
        if (blk_pc_request(rq))
-               __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
-                               rq->errors, len, data);
+               __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
+                               BLK_TA_DRV_DATA, rq->errors, len, data);
        else
-               __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
-                               0, BLK_TA_DRV_DATA, rq->errors, len, data);
+               __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0,
+                               BLK_TA_DRV_DATA, rq->errors, len, data);
 }
 EXPORT_SYMBOL_GPL(blk_add_driver_data);
 
@@ -1724,10 +1719,7 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
        if (blk_discard_rq(rq))
                rw |= (1 << BIO_RW_DISCARD);
 
-       if (blk_pc_request(rq))
-               bytes = rq->data_len;
-       else
-               bytes = rq->hard_nr_sectors << 9;
+       bytes = blk_rq_bytes(rq);
 
        blk_fill_rwbs(rwbs, rw, bytes);
 }