--- /dev/null
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/Kconfig linux-2.6.13-rc6-mm2/drivers/block/Kconfig
+--- /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/Kconfig 2005-08-24 13:17:28.000000000 +0200
++++ linux-2.6.13-rc6-mm2/drivers/block/Kconfig 2005-08-24 11:52:14.000000000 +0200
+@@ -419,6 +419,14 @@ 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
++ help
++ Say Y here, if you want to be able to trace the block layer actions
++ on a given queue.
++
++
+ config CDROM_PKTCDVD
+ tristate "Packet writing on CD/DVD media"
+ depends on !UML
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/Makefile linux-2.6.13-rc6-mm2/drivers/block/Makefile
+--- /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/Makefile 2005-08-07 20:18:56.000000000 +0200
++++ linux-2.6.13-rc6-mm2/drivers/block/Makefile 2005-08-24 11:52:14.000000000 +0200
+@@ -45,3 +45,5 @@ obj-$(CONFIG_VIODASD) += viodasd.o
+ obj-$(CONFIG_BLK_DEV_SX8) += sx8.o
+ obj-$(CONFIG_BLK_DEV_UB) += ub.o
+
++obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
++
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/blktrace.c linux-2.6.13-rc6-mm2/drivers/block/blktrace.c
+--- /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/blktrace.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.13-rc6-mm2/drivers/block/blktrace.c 2005-08-24 13:22:11.000000000 +0200
+@@ -0,0 +1,124 @@
++#include <linux/config.h>
++#include <linux/kernel.h>
++#include <linux/blkdev.h>
++#include <linux/blktrace.h>
++#include <asm/uaccess.h>
++
++void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
++ int rw, u32 what, int error, int pdu_len, char *pdu_data)
++{
++ struct blk_io_trace t;
++ unsigned long flags;
++
++ 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;
++
++ t.magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
++ t.sequence = atomic_add_return(1, &bt->sequence);
++ t.time = sched_clock();
++ t.sector = sector;
++ t.bytes = bytes;
++ t.action = what;
++ t.pid = current->pid;
++ t.error = error;
++ t.pdu_len = pdu_len;
++
++ local_irq_save(flags);
++ __relay_write(bt->rchan, &t, sizeof(t));
++ if (pdu_len)
++ __relay_write(bt->rchan, pdu_data, pdu_len);
++ local_irq_restore(flags);
++}
++
++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);
++
++ spin_lock_irq(q->queue_lock);
++ if (q->blk_trace) {
++ bt = q->blk_trace;
++ q->blk_trace = NULL;
++ ret = 0;
++ }
++ spin_unlock_irq(q->queue_lock);
++
++ up(&bdev->bd_sem);
++
++ if (bt) {
++ relay_close(bt->rchan);
++ kfree(bt);
++ }
++
++ return ret;
++}
++
++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;
++ char b[BDEVNAME_SIZE];
++ int ret = 0;
++
++ 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));
++
++ 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 = kmalloc(sizeof(*bt), GFP_KERNEL);
++ if (!bt)
++ goto err;
++
++ atomic_set(&bt->sequence, 0);
++
++ bt->rchan = relay_open(bdevname(bdev, b), NULL, buts.buf_size,
++ buts.buf_nr, NULL);
++ ret = -EIO;
++ if (!bt->rchan)
++ goto err;
++
++ bt->act_mask = buts.act_mask;
++ if (!bt->act_mask)
++ bt->act_mask = (u16) -1;
++
++ spin_lock_irq(q->queue_lock);
++ q->blk_trace = bt;
++ spin_unlock_irq(q->queue_lock);
++ ret = 0;
++err:
++ up(&bdev->bd_sem);
++ return ret;
++}
++
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/elevator.c linux-2.6.13-rc6-mm2/drivers/block/elevator.c
+--- /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/elevator.c 2005-08-07 20:18:56.000000000 +0200
++++ linux-2.6.13-rc6-mm2/drivers/block/elevator.c 2005-08-24 11:52:14.000000000 +0200
+@@ -34,6 +34,7 @@
+ #include <linux/slab.h>
+ #include <linux/init.h>
+ #include <linux/compiler.h>
++#include <linux/blktrace.h>
+
+ #include <asm/uaccess.h>
+
+@@ -371,6 +372,9 @@ struct request *elv_next_request(request
+ int ret;
+
+ while ((rq = __elv_next_request(q)) != NULL) {
++
++ blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
++
+ /*
+ * just mark as started even if we don't start it, a request
+ * that has been delayed should not be passed by new incoming
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/ioctl.c linux-2.6.13-rc6-mm2/drivers/block/ioctl.c
+--- /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/ioctl.c 2005-08-07 20:18:56.000000000 +0200
++++ linux-2.6.13-rc6-mm2/drivers/block/ioctl.c 2005-08-24 11:52:14.000000000 +0200
+@@ -4,6 +4,7 @@
+ #include <linux/backing-dev.h>
+ #include <linux/buffer_head.h>
+ #include <linux/smp_lock.h>
++#include <linux/blktrace.h>
+ #include <asm/uaccess.h>
+
+ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
+@@ -188,6 +189,10 @@ 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 -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/ll_rw_blk.c linux-2.6.13-rc6-mm2/drivers/block/ll_rw_blk.c
+--- /opt/kernel/linux-2.6.13-rc6-mm2/drivers/block/ll_rw_blk.c 2005-08-24 13:17:28.000000000 +0200
++++ linux-2.6.13-rc6-mm2/drivers/block/ll_rw_blk.c 2005-08-24 11:52:14.000000000 +0200
+@@ -29,6 +29,7 @@
+ #include <linux/swap.h>
+ #include <linux/writeback.h>
+ #include <linux/blkdev.h>
++#include <linux/blktrace.h>
+
+ /*
+ * for max sense size
+@@ -1625,6 +1626,12 @@ void blk_cleanup_queue(request_queue_t *
+ if (q->queue_tags)
+ __blk_queue_free_tags(q);
+
++ if (q->blk_trace) {
++ relay_close(q->blk_trace->rchan);
++ kfree(q->blk_trace);
++ q->blk_trace = NULL;
++ }
++
+ blk_queue_ordered(q, QUEUE_ORDERED_NONE);
+
+ kmem_cache_free(requestq_cachep, q);
+@@ -1971,6 +1978,8 @@ rq_starved:
+
+ rq_init(q, rq);
+ rq->rl = rl;
++
++ blk_add_trace_generic(q, bio, rw, BLK_TA_GETRQ);
+ out:
+ return rq;
+ }
+@@ -1999,6 +2008,8 @@ 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();
+@@ -2052,6 +2063,8 @@ 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);
+
+@@ -2665,6 +2678,8 @@ 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;
+@@ -2680,6 +2695,8 @@ 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;
+
+@@ -2705,6 +2722,8 @@ static int __make_request(request_queue_
+ }
+
+ get_rq:
++ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
++
+ /*
+ * Grab a free request. This is might sleep but can not fail.
+ * Returns with the queue unlocked.
+@@ -2981,6 +3000,10 @@ end_io:
+ blk_partition_remap(bio);
+
+ ret = q->make_request_fn(q, bio);
++
++ if (ret)
++ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
++
+ } while (ret);
+ }
+
+@@ -3099,6 +3122,8 @@ 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 -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/include/linux/blkdev.h linux-2.6.13-rc6-mm2/include/linux/blkdev.h
+--- /opt/kernel/linux-2.6.13-rc6-mm2/include/linux/blkdev.h 2005-08-24 13:17:35.000000000 +0200
++++ linux-2.6.13-rc6-mm2/include/linux/blkdev.h 2005-08-24 11:52:14.000000000 +0200
+@@ -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 */
+@@ -412,6 +413,8 @@ struct request_queue
+ */
+ struct request *flush_rq;
+ unsigned char ordered;
++
++ struct blk_trace *blk_trace;
+ };
+
+ enum {
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/include/linux/blktrace.h linux-2.6.13-rc6-mm2/include/linux/blktrace.h
+--- /opt/kernel/linux-2.6.13-rc6-mm2/include/linux/blktrace.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.13-rc6-mm2/include/linux/blktrace.h 2005-08-24 13:22:24.000000000 +0200
+@@ -0,0 +1,145 @@
++#ifndef BLKTRACE_H
++#define BLKTRACE_H
++
++#include <linux/config.h>
++#include <linux/blkdev.h>
++#include <linux/relayfs_fs.h>
++
++/*
++ * Trace categories
++ */
++enum {
++ 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 {
++ __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 */
++};
++
++/*
++ * 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_IO_TRACE_MAGIC 0x65617400
++#define BLK_IO_TRACE_VERSION 0x02
++
++/*
++ * 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 */
++ u16 error; /* completion error */
++ u16 pdu_len; /* length of data after this trace */
++};
++
++struct blk_trace {
++ struct rchan *rchan;
++ atomic_t sequence;
++ u16 act_mask;
++};
++
++/*
++ * 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 */
++};
++
++#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_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, char *);
++
++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);
++}
++
++#else /* !CONFIG_BLK_DEV_IO_TRACE */
++#define blk_start_trace(bdev, arg) (-EINVAL)
++#define blk_stop_trace(bdev) (-EINVAL)
++#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)
++#endif /* CONFIG_BLK_DEV_IO_TRACE */
++
++#endif
+diff -urpN -X linux-2.6.13-rc6-mm2/Documentation/dontdiff /opt/kernel/linux-2.6.13-rc6-mm2/include/linux/fs.h linux-2.6.13-rc6-mm2/include/linux/fs.h
+--- /opt/kernel/linux-2.6.13-rc6-mm2/include/linux/fs.h 2005-08-24 13:17:35.000000000 +0200
++++ linux-2.6.13-rc6-mm2/include/linux/fs.h 2005-08-24 11:52:14.000000000 +0200
+@@ -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 */
projects / blktrace.git / commitdiff