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authorJens Axboe <axboe@suse.de>2006-02-02 18:39:40 +0100
committerJens Axboe <axboe@suse.de>2006-02-02 18:39:40 +0100
commitd04130832ccca445051eda86f9129a4eda2446be (patch)
tree0750361320db66fe7decc6a1aba4ad540d5fc108 /kernel/blk-trace-2.6.16-rc1-git-U0
parent4ab4280173d8ad828e5f1428ecc44c53479ad2fe (diff)
downloadblktrace-d04130832ccca445051eda86f9129a4eda2446be.tar.gz
blktrace-d04130832ccca445051eda86f9129a4eda2446be.tar.bz2
[PATCH] kernel: update to recent fixes
Diffstat (limited to 'kernel/blk-trace-2.6.16-rc1-git-U0')
-rw-r--r--kernel/blk-trace-2.6.16-rc1-git-U0997
1 files changed, 0 insertions, 997 deletions
diff --git a/kernel/blk-trace-2.6.16-rc1-git-U0 b/kernel/blk-trace-2.6.16-rc1-git-U0
deleted file mode 100644
index 677852b..0000000
--- a/kernel/blk-trace-2.6.16-rc1-git-U0
+++ /dev/null
@@ -1,997 +0,0 @@
-diff --git a/block/Kconfig b/block/Kconfig
-index 377f6dd..27eaed9 100644
---- a/block/Kconfig
-+++ b/block/Kconfig
-@@ -11,4 +11,15 @@ config LBD
- your machine, or if you want to have a raid or loopback device
- bigger than 2TB. Otherwise say N.
-
-+config BLK_DEV_IO_TRACE
-+ bool "Support for tracing block io actions"
-+ select RELAYFS_FS
-+ help
-+ Say Y here, if you want to be able to trace the block layer actions
-+ on a given queue. Tracing allows you to see any traffic happening
-+ on a block device queue. For more information (and the user space
-+ support tools needed), fetch the blktrace app from:
-+
-+ git://brick.kernel.dk/data/git/blktrace.git
-+
- source block/Kconfig.iosched
-diff --git a/block/Makefile b/block/Makefile
-index 7e4f93e..c05de0e 100644
---- a/block/Makefile
-+++ b/block/Makefile
-@@ -8,3 +8,5 @@ obj-$(CONFIG_IOSCHED_NOOP) += noop-iosch
- obj-$(CONFIG_IOSCHED_AS) += as-iosched.o
- obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
- obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
-+
-+obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
-diff --git a/block/blktrace.c b/block/blktrace.c
-new file mode 100644
-index 0000000..21b381d
---- /dev/null
-+++ b/block/blktrace.c
-@@ -0,0 +1,362 @@
-+#include <linux/config.h>
-+#include <linux/kernel.h>
-+#include <linux/blkdev.h>
-+#include <linux/blktrace_api.h>
-+#include <linux/percpu.h>
-+#include <linux/init.h>
-+#include <linux/mutex.h>
-+#include <asm/uaccess.h>
-+
-+static DEFINE_PER_CPU(unsigned long long, blk_trace_cpu_offset) = { 0, };
-+
-+void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
-+ int rw, u32 what, int error, int pdu_len, void *pdu_data)
-+{
-+ struct blk_io_trace *t;
-+ unsigned long flags;
-+ unsigned long *sequence;
-+ pid_t pid;
-+ int cpu;
-+
-+ if (rw & (1 << BIO_RW_BARRIER))
-+ what |= BLK_TC_ACT(BLK_TC_BARRIER);
-+ if (rw & (1 << BIO_RW_SYNC))
-+ what |= BLK_TC_ACT(BLK_TC_SYNC);
-+
-+ if (rw & WRITE)
-+ what |= BLK_TC_ACT(BLK_TC_WRITE);
-+ else
-+ what |= BLK_TC_ACT(BLK_TC_READ);
-+
-+ if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
-+ return;
-+ if (sector < bt->start_lba || sector > bt->end_lba)
-+ return;
-+
-+ pid = current->pid;
-+ if (bt->pid && pid != bt->pid)
-+ return;
-+
-+ local_irq_save(flags);
-+
-+ t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
-+ if (unlikely(!t)) {
-+ local_irq_restore(flags);
-+ return;
-+ }
-+
-+ cpu = smp_processor_id();
-+ sequence = per_cpu_ptr(bt->sequence, cpu);
-+ t->sequence = ++(*sequence);
-+ t->time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
-+ t->cpu = cpu;
-+
-+ local_irq_restore(flags);
-+
-+ t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
-+ t->device = bt->dev;
-+ t->sector = sector;
-+ t->bytes = bytes;
-+ t->action = what;
-+ t->error = error;
-+ t->pdu_len = pdu_len;
-+
-+ t->pid = pid;
-+ memcpy(t->comm, current->comm, sizeof(t->comm));
-+
-+ if (pdu_len)
-+ memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
-+}
-+
-+EXPORT_SYMBOL_GPL(__blk_add_trace);
-+
-+static struct dentry *blk_tree_root;
-+static struct mutex blk_tree_mutex;
-+
-+static inline void blk_remove_root(void)
-+{
-+ if (relayfs_remove_dir(blk_tree_root) != -ENOTEMPTY)
-+ blk_tree_root = NULL;
-+}
-+
-+static void blk_remove_tree(struct dentry *dir)
-+{
-+ mutex_lock(&blk_tree_mutex);
-+ relayfs_remove_dir(dir);
-+ blk_remove_root();
-+ mutex_unlock(&blk_tree_mutex);
-+}
-+
-+static struct dentry *blk_create_tree(const char *blk_name)
-+{
-+ struct dentry *dir = NULL;
-+
-+ mutex_lock(&blk_tree_mutex);
-+
-+ if (!blk_tree_root) {
-+ blk_tree_root = relayfs_create_dir("block", NULL);
-+ if (!blk_tree_root)
-+ goto err;
-+ }
-+
-+ dir = relayfs_create_dir(blk_name, blk_tree_root);
-+ if (!dir)
-+ blk_remove_root();
-+
-+err:
-+ mutex_unlock(&blk_tree_mutex);
-+ return dir;
-+}
-+
-+void blk_cleanup_trace(struct blk_trace *bt)
-+{
-+ relay_close(bt->rchan);
-+ relayfs_remove_file(bt->dropped_file);
-+ blk_remove_tree(bt->dir);
-+ kfree(bt);
-+}
-+
-+int blk_stop_trace(struct block_device *bdev)
-+{
-+ request_queue_t *q = bdev_get_queue(bdev);
-+ struct blk_trace *bt = NULL;
-+ int ret = -EINVAL;
-+
-+ if (!q)
-+ return -ENXIO;
-+
-+ down(&bdev->bd_sem);
-+
-+ if (q->blk_trace) {
-+ bt = q->blk_trace;
-+ q->blk_trace = NULL;
-+ ret = 0;
-+ }
-+
-+ up(&bdev->bd_sem);
-+
-+ if (bt)
-+ blk_cleanup_trace(bt);
-+
-+ return ret;
-+}
-+
-+static int blk_dropped_open(struct inode *inode, struct file *filp)
-+{
-+ filp->private_data = inode->u.generic_ip;
-+
-+ return 0;
-+}
-+
-+static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,
-+ size_t count, loff_t *ppos)
-+{
-+ struct blk_trace *bt = filp->private_data;
-+ char buf[16];
-+
-+ snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
-+
-+ return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
-+}
-+
-+static struct file_operations blk_dropped_fops = {
-+ .owner = THIS_MODULE,
-+ .open = blk_dropped_open,
-+ .read = blk_dropped_read,
-+};
-+
-+static int blk_subbuf_start_callback (struct rchan_buf *buf,
-+ void *subbuf,
-+ void *prev_subbuf,
-+ size_t prev_padding)
-+{
-+ if (relay_buf_full(buf)) {
-+ struct blk_trace *bt = buf->chan->private_data;
-+
-+ atomic_inc(&bt->dropped);
-+ return 0;
-+ }
-+
-+ return 1;
-+}
-+
-+static struct rchan_callbacks blk_relay_callbacks = {
-+ .subbuf_start = blk_subbuf_start_callback,
-+};
-+
-+int blk_start_trace(struct block_device *bdev, char __user *arg)
-+{
-+ request_queue_t *q = bdev_get_queue(bdev);
-+ struct blk_user_trace_setup buts;
-+ struct blk_trace *bt = NULL;
-+ struct dentry *dir = NULL;
-+ char b[BDEVNAME_SIZE];
-+ int ret, i;
-+
-+ if (!q)
-+ return -ENXIO;
-+
-+ if (copy_from_user(&buts, arg, sizeof(buts)))
-+ return -EFAULT;
-+
-+ if (!buts.buf_size || !buts.buf_nr)
-+ return -EINVAL;
-+
-+ strcpy(buts.name, bdevname(bdev, b));
-+
-+ /*
-+ * some device names have larger paths - convert the slashes
-+ * to underscores for this to work as expected
-+ */
-+ for (i = 0; i < strlen(buts.name); i++)
-+ if (buts.name[i] == '/')
-+ buts.name[i] = '_';
-+
-+ if (copy_to_user(arg, &buts, sizeof(buts)))
-+ return -EFAULT;
-+
-+ down(&bdev->bd_sem);
-+ ret = -EBUSY;
-+ if (q->blk_trace)
-+ goto err;
-+
-+ ret = -ENOMEM;
-+ bt = kzalloc(sizeof(*bt), GFP_KERNEL);
-+ if (!bt)
-+ goto err;
-+
-+ bt->sequence = alloc_percpu(unsigned long);
-+ if (!bt->sequence)
-+ goto err;
-+
-+ ret = -ENOENT;
-+ dir = blk_create_tree(buts.name);
-+ if (!dir)
-+ goto err;
-+
-+ bt->dir = dir;
-+ bt->dev = bdev->bd_dev;
-+ atomic_set(&bt->dropped, 0);
-+
-+ ret = -EIO;
-+ bt->dropped_file = relayfs_create_file("dropped", dir, 0, &blk_dropped_fops, bt);
-+ if (!bt->dropped_file)
-+ goto err;
-+
-+ bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, &blk_relay_callbacks);
-+ if (!bt->rchan)
-+ goto err;
-+ bt->rchan->private_data = bt;
-+
-+ bt->act_mask = buts.act_mask;
-+ if (!bt->act_mask)
-+ bt->act_mask = (u16) -1;
-+
-+ bt->start_lba = buts.start_lba;
-+ bt->end_lba = buts.end_lba;
-+ if (!bt->end_lba)
-+ bt->end_lba = -1ULL;
-+
-+ bt->pid = buts.pid;
-+
-+ q->blk_trace = bt;
-+ up(&bdev->bd_sem);
-+ return 0;
-+err:
-+ up(&bdev->bd_sem);
-+ if (bt && bt->dropped_file)
-+ relayfs_remove_file(bt->dropped_file);
-+ if (dir)
-+ blk_remove_tree(dir);
-+ if (bt) {
-+ if (bt->sequence)
-+ free_percpu(bt->sequence);
-+ kfree(bt);
-+ }
-+ return ret;
-+}
-+
-+/*
-+ * Average offset over two calls to sched_clock() with a gettimeofday()
-+ * in the middle
-+ */
-+static void blk_check_time(unsigned long long *t)
-+{
-+ unsigned long long a, b;
-+ struct timeval tv;
-+
-+ a = sched_clock();
-+ do_gettimeofday(&tv);
-+ b = sched_clock();
-+
-+ *t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
-+ *t -= (a + b) / 2;
-+}
-+
-+static void blk_trace_check_cpu_time(void *data)
-+{
-+ unsigned long long *t;
-+ int cpu = get_cpu();
-+
-+ t = &per_cpu(blk_trace_cpu_offset, cpu);
-+
-+ /*
-+ * Just call it twice, hopefully the second call will be cache hot
-+ * and a little more precise
-+ */
-+ blk_check_time(t);
-+ blk_check_time(t);
-+
-+ put_cpu();
-+}
-+
-+/*
-+ * Call blk_trace_check_cpu_time() on each CPU to calibrate our inter-CPU
-+ * timings
-+ */
-+static void blk_trace_calibrate_offsets(void)
-+{
-+ unsigned long flags;
-+
-+ smp_call_function(blk_trace_check_cpu_time, NULL, 1, 1);
-+ local_irq_save(flags);
-+ blk_trace_check_cpu_time(NULL);
-+ local_irq_restore(flags);
-+}
-+
-+static void blk_trace_set_ht_offsets(void)
-+{
-+#if defined(CONFIG_SCHED_SMT)
-+ int cpu, i;
-+
-+ /*
-+ * now make sure HT siblings have the same time offset
-+ */
-+ preempt_disable();
-+ for_each_online_cpu(cpu) {
-+ unsigned long long *cpu_off, *sibling_off;
-+
-+ for_each_cpu_mask(i, cpu_sibling_map[cpu]) {
-+ if (i == cpu)
-+ continue;
-+
-+ cpu_off = &per_cpu(blk_trace_cpu_offset, cpu);
-+ sibling_off = &per_cpu(blk_trace_cpu_offset, i);
-+ *sibling_off = *cpu_off;
-+ }
-+ }
-+ preempt_enable();
-+#endif
-+}
-+
-+static __init int blk_trace_init(void)
-+{
-+ mutex_init(&blk_tree_mutex);
-+ blk_trace_calibrate_offsets();
-+ blk_trace_set_ht_offsets();
-+
-+ return 0;
-+}
-+
-+module_init(blk_trace_init);
-+
-diff --git a/block/elevator.c b/block/elevator.c
-index c9f424d..793c686 100644
---- a/block/elevator.c
-+++ b/block/elevator.c
-@@ -33,6 +33,7 @@
- #include <linux/init.h>
- #include <linux/compiler.h>
- #include <linux/delay.h>
-+#include <linux/blktrace_api.h>
-
- #include <asm/uaccess.h>
-
-@@ -333,6 +334,8 @@ void __elv_add_request(request_queue_t *
- struct list_head *pos;
- unsigned ordseq;
-
-+ blk_add_trace_rq(q, rq, BLK_TA_INSERT);
-+
- if (q->ordcolor)
- rq->flags |= REQ_ORDERED_COLOR;
-
-@@ -491,6 +494,7 @@ struct request *elv_next_request(request
- * not be passed by new incoming requests
- */
- rq->flags |= REQ_STARTED;
-+ blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
- }
-
- if (!q->boundary_rq || q->boundary_rq == rq) {
-diff --git a/block/ioctl.c b/block/ioctl.c
-index e110949..63e67a2 100644
---- a/block/ioctl.c
-+++ b/block/ioctl.c
-@@ -5,6 +5,7 @@
- #include <linux/backing-dev.h>
- #include <linux/buffer_head.h>
- #include <linux/smp_lock.h>
-+#include <linux/blktrace_api.h>
- #include <asm/uaccess.h>
-
- static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
-@@ -189,6 +190,10 @@ static int blkdev_locked_ioctl(struct fi
- return put_ulong(arg, bdev->bd_inode->i_size >> 9);
- case BLKGETSIZE64:
- return put_u64(arg, bdev->bd_inode->i_size);
-+ case BLKSTARTTRACE:
-+ return blk_start_trace(bdev, (char __user *) arg);
-+ case BLKSTOPTRACE:
-+ return blk_stop_trace(bdev);
- }
- return -ENOIOCTLCMD;
- }
-diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
-index 8e27d0a..bfcde0f 100644
---- a/block/ll_rw_blk.c
-+++ b/block/ll_rw_blk.c
-@@ -28,6 +28,7 @@
- #include <linux/writeback.h>
- #include <linux/interrupt.h>
- #include <linux/cpu.h>
-+#include <linux/blktrace_api.h>
-
- /*
- * for max sense size
-@@ -1555,8 +1556,10 @@ void blk_plug_device(request_queue_t *q)
- if (test_bit(QUEUE_FLAG_STOPPED, &q->queue_flags))
- return;
-
-- if (!test_and_set_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags))
-+ if (!test_and_set_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags)) {
- mod_timer(&q->unplug_timer, jiffies + q->unplug_delay);
-+ blk_add_trace_generic(q, NULL, 0, BLK_TA_PLUG);
-+ }
- }
-
- EXPORT_SYMBOL(blk_plug_device);
-@@ -1620,14 +1623,21 @@ static void blk_backing_dev_unplug(struc
- /*
- * devices don't necessarily have an ->unplug_fn defined
- */
-- if (q->unplug_fn)
-+ if (q->unplug_fn) {
-+ blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_IO, NULL,
-+ q->rq.count[READ] + q->rq.count[WRITE]);
-+
- q->unplug_fn(q);
-+ }
- }
-
- static void blk_unplug_work(void *data)
- {
- request_queue_t *q = data;
-
-+ blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_IO, NULL,
-+ q->rq.count[READ] + q->rq.count[WRITE]);
-+
- q->unplug_fn(q);
- }
-
-@@ -1635,6 +1645,9 @@ static void blk_unplug_timeout(unsigned
- {
- request_queue_t *q = (request_queue_t *)data;
-
-+ blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_TIMER, NULL,
-+ q->rq.count[READ] + q->rq.count[WRITE]);
-+
- kblockd_schedule_work(&q->unplug_work);
- }
-
-@@ -1757,6 +1770,11 @@ void blk_cleanup_queue(request_queue_t *
- if (q->queue_tags)
- __blk_queue_free_tags(q);
-
-+ if (q->blk_trace) {
-+ blk_cleanup_trace(q->blk_trace);
-+ q->blk_trace = NULL;
-+ }
-+
- kmem_cache_free(requestq_cachep, q);
- }
-
-@@ -2108,6 +2126,8 @@ rq_starved:
-
- rq_init(q, rq);
- rq->rl = rl;
-+
-+ blk_add_trace_generic(q, bio, rw, BLK_TA_GETRQ);
- out:
- return rq;
- }
-@@ -2136,6 +2156,8 @@ static struct request *get_request_wait(
- if (!rq) {
- struct io_context *ioc;
-
-+ blk_add_trace_generic(q, bio, rw, BLK_TA_SLEEPRQ);
-+
- __generic_unplug_device(q);
- spin_unlock_irq(q->queue_lock);
- io_schedule();
-@@ -2189,6 +2211,8 @@ EXPORT_SYMBOL(blk_get_request);
- */
- void blk_requeue_request(request_queue_t *q, struct request *rq)
- {
-+ blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
-+
- if (blk_rq_tagged(rq))
- blk_queue_end_tag(q, rq);
-
-@@ -2820,6 +2844,8 @@ static int __make_request(request_queue_
- if (!q->back_merge_fn(q, req, bio))
- break;
-
-+ blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
-+
- req->biotail->bi_next = bio;
- req->biotail = bio;
- req->nr_sectors = req->hard_nr_sectors += nr_sectors;
-@@ -2835,6 +2861,8 @@ static int __make_request(request_queue_
- if (!q->front_merge_fn(q, req, bio))
- break;
-
-+ blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
-+
- bio->bi_next = req->bio;
- req->bio = bio;
-
-@@ -2952,6 +2980,7 @@ void generic_make_request(struct bio *bi
- request_queue_t *q;
- sector_t maxsector;
- int ret, nr_sectors = bio_sectors(bio);
-+ dev_t old_dev;
-
- might_sleep();
- /* Test device or partition size, when known. */
-@@ -2978,6 +3007,8 @@ void generic_make_request(struct bio *bi
- * NOTE: we don't repeat the blk_size check for each new device.
- * Stacking drivers are expected to know what they are doing.
- */
-+ maxsector = -1;
-+ old_dev = 0;
- do {
- char b[BDEVNAME_SIZE];
-
-@@ -3010,6 +3041,15 @@ end_io:
- */
- blk_partition_remap(bio);
-
-+ if (maxsector != -1)
-+ blk_add_trace_remap(q, bio, old_dev, bio->bi_sector,
-+ maxsector);
-+
-+ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
-+
-+ maxsector = bio->bi_sector;
-+ old_dev = bio->bi_bdev->bd_dev;
-+
- ret = q->make_request_fn(q, bio);
- } while (ret);
- }
-@@ -3129,6 +3169,8 @@ static int __end_that_request_first(stru
- int total_bytes, bio_nbytes, error, next_idx = 0;
- struct bio *bio;
-
-+ blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
-+
- /*
- * extend uptodate bool to allow < 0 value to be direct io error
- */
-diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
-index 12d7b9b..880892a 100644
---- a/drivers/block/cciss.c
-+++ b/drivers/block/cciss.c
-@@ -38,6 +38,7 @@
- #include <linux/hdreg.h>
- #include <linux/spinlock.h>
- #include <linux/compat.h>
-+#include <linux/blktrace_api.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
-
-@@ -2330,6 +2331,7 @@ static inline void complete_command( ctl
-
- cmd->rq->completion_data = cmd;
- cmd->rq->errors = status;
-+ blk_add_trace_rq(cmd->rq->q, cmd->rq, BLK_TA_COMPLETE);
- blk_complete_request(cmd->rq);
- }
-
-diff --git a/drivers/md/dm.c b/drivers/md/dm.c
-index 8c16359..8c979c2 100644
---- a/drivers/md/dm.c
-+++ b/drivers/md/dm.c
-@@ -17,6 +17,7 @@
- #include <linux/mempool.h>
- #include <linux/slab.h>
- #include <linux/idr.h>
-+#include <linux/blktrace_api.h>
-
- static const char *_name = DM_NAME;
-
-@@ -303,6 +304,8 @@ static void dec_pending(struct dm_io *io
- /* nudge anyone waiting on suspend queue */
- wake_up(&io->md->wait);
-
-+ blk_add_trace_bio(io->md->queue, io->bio, BLK_TA_COMPLETE);
-+
- bio_endio(io->bio, io->bio->bi_size, io->error);
- free_io(io->md, io);
- }
-@@ -361,6 +364,7 @@ static void __map_bio(struct dm_target *
- struct target_io *tio)
- {
- int r;
-+ sector_t sector;
-
- /*
- * Sanity checks.
-@@ -376,10 +380,17 @@ static void __map_bio(struct dm_target *
- * this io.
- */
- atomic_inc(&tio->io->io_count);
-+ sector = clone->bi_sector;
- r = ti->type->map(ti, clone, &tio->info);
-- if (r > 0)
-+ if (r > 0) {
- /* the bio has been remapped so dispatch it */
-+
-+ blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
-+ tio->io->bio->bi_bdev->bd_dev, sector,
-+ clone->bi_sector);
-+
- generic_make_request(clone);
-+ }
-
- else if (r < 0) {
- /* error the io and bail out */
-diff --git a/fs/bio.c b/fs/bio.c
-index bbc442b..8a1b0b6 100644
---- a/fs/bio.c
-+++ b/fs/bio.c
-@@ -25,6 +25,7 @@
- #include <linux/module.h>
- #include <linux/mempool.h>
- #include <linux/workqueue.h>
-+#include <linux/blktrace_api.h>
- #include <scsi/sg.h> /* for struct sg_iovec */
-
- #define BIO_POOL_SIZE 256
-@@ -1094,6 +1095,9 @@ struct bio_pair *bio_split(struct bio *b
- if (!bp)
- return bp;
-
-+ blk_add_trace_pdu_int(bdev_get_queue(bi->bi_bdev), BLK_TA_SPLIT, bi,
-+ bi->bi_sector + first_sectors);
-+
- BUG_ON(bi->bi_vcnt != 1);
- BUG_ON(bi->bi_idx != 0);
- atomic_set(&bp->cnt, 3);
-diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
-index 5dd0207..010e02b 100644
---- a/fs/compat_ioctl.c
-+++ b/fs/compat_ioctl.c
-@@ -72,6 +72,7 @@
- #include <linux/i2c-dev.h>
- #include <linux/wireless.h>
- #include <linux/atalk.h>
-+#include <linux/blktrace_api.h>
-
- #include <net/sock.h> /* siocdevprivate_ioctl */
- #include <net/bluetooth/bluetooth.h>
-diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
-index 02a585f..195c3b9 100644
---- a/include/linux/blkdev.h
-+++ b/include/linux/blkdev.h
-@@ -22,6 +22,7 @@ typedef struct request_queue request_que
- struct elevator_queue;
- typedef struct elevator_queue elevator_t;
- struct request_pm_state;
-+struct blk_trace;
-
- #define BLKDEV_MIN_RQ 4
- #define BLKDEV_MAX_RQ 128 /* Default maximum */
-@@ -416,6 +417,8 @@ struct request_queue
- unsigned int sg_reserved_size;
- int node;
-
-+ struct blk_trace *blk_trace;
-+
- /*
- * reserved for flush operations
- */
-diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
-new file mode 100644
-index 0000000..026b995
---- /dev/null
-+++ b/include/linux/blktrace_api.h
-@@ -0,0 +1,215 @@
-+#ifndef BLKTRACE_H
-+#define BLKTRACE_H
-+
-+#include <linux/config.h>
-+#include <linux/blkdev.h>
-+#include <linux/relayfs_fs.h>
-+
-+/*
-+ * Trace categories
-+ */
-+enum blktrace_cat {
-+ BLK_TC_READ = 1 << 0, /* reads */
-+ BLK_TC_WRITE = 1 << 1, /* writes */
-+ BLK_TC_BARRIER = 1 << 2, /* barrier */
-+ BLK_TC_SYNC = 1 << 3, /* barrier */
-+ BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
-+ BLK_TC_REQUEUE = 1 << 5, /* requeueing */
-+ BLK_TC_ISSUE = 1 << 6, /* issue */
-+ BLK_TC_COMPLETE = 1 << 7, /* completions */
-+ BLK_TC_FS = 1 << 8, /* fs requests */
-+ BLK_TC_PC = 1 << 9, /* pc requests */
-+
-+ BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
-+};
-+
-+#define BLK_TC_SHIFT (16)
-+#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
-+
-+/*
-+ * Basic trace actions
-+ */
-+enum blktrace_act {
-+ __BLK_TA_QUEUE = 1, /* queued */
-+ __BLK_TA_BACKMERGE, /* back merged to existing rq */
-+ __BLK_TA_FRONTMERGE, /* front merge to existing rq */
-+ __BLK_TA_GETRQ, /* allocated new request */
-+ __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
-+ __BLK_TA_REQUEUE, /* request requeued */
-+ __BLK_TA_ISSUE, /* sent to driver */
-+ __BLK_TA_COMPLETE, /* completed by driver */
-+ __BLK_TA_PLUG, /* queue was plugged */
-+ __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
-+ __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
-+ __BLK_TA_INSERT, /* insert request */
-+ __BLK_TA_SPLIT, /* bio was split */
-+ __BLK_TA_BOUNCE, /* bio was bounced */
-+ __BLK_TA_REMAP, /* bio was remapped */
-+};
-+
-+/*
-+ * Trace actions in full. Additionally, read or write is masked
-+ */
-+#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
-+#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
-+#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
-+#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
-+#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
-+#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
-+
-+#define BLK_IO_TRACE_MAGIC 0x65617400
-+#define BLK_IO_TRACE_VERSION 0x06
-+
-+/*
-+ * The trace itself
-+ */
-+struct blk_io_trace {
-+ u32 magic; /* MAGIC << 8 | version */
-+ u32 sequence; /* event number */
-+ u64 time; /* in microseconds */
-+ u64 sector; /* disk offset */
-+ u32 bytes; /* transfer length */
-+ u32 action; /* what happened */
-+ u32 pid; /* who did it */
-+ u32 cpu; /* on what cpu did it happen */
-+ u16 error; /* completion error */
-+ u16 pdu_len; /* length of data after this trace */
-+ u32 device; /* device number */
-+ char comm[16]; /* task command name (TASK_COMM_LEN) */
-+};
-+
-+/*
-+ * The remap event
-+ */
-+struct blk_io_trace_remap {
-+ u32 device;
-+ u32 __pad;
-+ u64 sector;
-+};
-+
-+struct blk_trace {
-+ struct dentry *dir;
-+ struct rchan *rchan;
-+ struct dentry *dropped_file;
-+ atomic_t dropped;
-+ unsigned long *sequence;
-+ u32 dev;
-+ u16 act_mask;
-+ u64 start_lba;
-+ u64 end_lba;
-+ u32 pid;
-+};
-+
-+/*
-+ * User setup structure passed with BLKSTARTTRACE
-+ */
-+struct blk_user_trace_setup {
-+ char name[BDEVNAME_SIZE]; /* output */
-+ u16 act_mask; /* input */
-+ u32 buf_size; /* input */
-+ u32 buf_nr; /* input */
-+ u64 start_lba;
-+ u64 end_lba;
-+ u32 pid;
-+};
-+
-+#if defined(CONFIG_BLK_DEV_IO_TRACE)
-+extern int blk_start_trace(struct block_device *, char __user *);
-+extern int blk_stop_trace(struct block_device *);
-+extern void blk_cleanup_trace(struct blk_trace *);
-+extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, void *);
-+
-+static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
-+ u32 what)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+ int rw = rq->flags & 0x07;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ if (blk_pc_request(rq)) {
-+ what |= BLK_TC_ACT(BLK_TC_PC);
-+ __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), 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);
-+ }
-+}
-+
-+static inline void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
-+ u32 what)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
-+}
-+
-+static inline void blk_add_trace_generic(struct request_queue *q,
-+ struct bio *bio, int rw, u32 what)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ if (bio)
-+ blk_add_trace_bio(q, bio, what);
-+ else
-+ __blk_add_trace(bt, 0, 0, rw, what, 0, 0, NULL);
-+}
-+
-+static inline void blk_add_trace_pdu_int(struct request_queue *q, u32 what,
-+ struct bio *bio, unsigned int pdu)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+ u64 rpdu = cpu_to_be64(pdu);
-+
-+ if (likely(!bt))
-+ return;
-+
-+ if (bio)
-+ __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), sizeof(rpdu), &rpdu);
-+ else
-+ __blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
-+}
-+
-+static inline void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
-+ dev_t dev, sector_t from, sector_t to)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+ struct blk_io_trace_remap r;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ r.device = cpu_to_be32(dev);
-+ r.sector = cpu_to_be64(to);
-+
-+ __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
-+}
-+
-+#else /* !CONFIG_BLK_DEV_IO_TRACE */
-+#define blk_start_trace(bdev, arg) (-EINVAL)
-+#define blk_stop_trace(bdev) (-EINVAL)
-+#define blk_cleanup_trace(bt) do { } while (0)
-+#define blk_add_trace_rq(q, rq, what) do { } while (0)
-+#define blk_add_trace_bio(q, rq, what) do { } while (0)
-+#define blk_add_trace_generic(q, rq, rw, what) do { } while (0)
-+#define blk_add_trace_pdu_int(q, what, bio, pdu) do { } while (0)
-+#define blk_add_trace_remap(q, bio, dev, f, t) do {} while (0)
-+#endif /* CONFIG_BLK_DEV_IO_TRACE */
-+
-+#endif
-diff --git a/include/linux/compat_ioctl.h b/include/linux/compat_ioctl.h
-index 8fad50f..5bed09a 100644
---- a/include/linux/compat_ioctl.h
-+++ b/include/linux/compat_ioctl.h
-@@ -97,6 +97,8 @@ COMPATIBLE_IOCTL(BLKRRPART)
- COMPATIBLE_IOCTL(BLKFLSBUF)
- COMPATIBLE_IOCTL(BLKSECTSET)
- COMPATIBLE_IOCTL(BLKSSZGET)
-+COMPATIBLE_IOCTL(BLKSTARTTRACE)
-+COMPATIBLE_IOCTL(BLKSTOPTRACE)
- ULONG_IOCTL(BLKRASET)
- ULONG_IOCTL(BLKFRASET)
- /* RAID */
-diff --git a/include/linux/fs.h b/include/linux/fs.h
-index b77f260..5575284 100644
---- a/include/linux/fs.h
-+++ b/include/linux/fs.h
-@@ -196,6 +196,8 @@ extern int dir_notify_enable;
- #define BLKBSZGET _IOR(0x12,112,size_t)
- #define BLKBSZSET _IOW(0x12,113,size_t)
- #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
-+#define BLKSTARTTRACE _IOWR(0x12,115,struct blk_user_trace_setup)
-+#define BLKSTOPTRACE _IO(0x12,116)
-
- #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
- #define FIBMAP _IO(0x00,1) /* bmap access */
-diff --git a/mm/highmem.c b/mm/highmem.c
-index ce2e7e8..d0ea1ee 100644
---- a/mm/highmem.c
-+++ b/mm/highmem.c
-@@ -26,6 +26,7 @@
- #include <linux/init.h>
- #include <linux/hash.h>
- #include <linux/highmem.h>
-+#include <linux/blktrace_api.h>
- #include <asm/tlbflush.h>
-
- static mempool_t *page_pool, *isa_page_pool;
-@@ -483,6 +484,8 @@ void blk_queue_bounce(request_queue_t *q
- pool = isa_page_pool;
- }
-
-+ blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
-+
- /*
- * slow path
- */