Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: fix blkdev_issue_flush() not detecting and passing EOPNOTSUPP back
  block: fix shadowed variable warning in blk-map.c
  block: remove extern on function definition
  cciss: remove READ_AHEAD define and use block layer defaults
  make cdrom.c:check_for_audio_disc() static
  block/genhd.c: proper externs
  unexport blk_rq_map_user_iov
  unexport blk_{get,put}_queue
  block/genhd.c: cleanups
  proper prototype for blk_dev_init()
  block/blk-tag.c should #include "blk.h"
  Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory
  block: separate out padding from alignment
  block: restore the meaning of rq->data_len to the true data length
  resubmit: cciss: procfs updates to display info about many
  splice: only return -EAGAIN if there's hope of more data
  block: fix kernel-docbook parameters and files

Documentation/DocBook/kernel-api.tmpl

@@ -361,12 +361,14 @@ X!Edrivers/pnp/system.c
   <chapter id="blkdev">
      <title>Block Devices</title>
 !Eblock/blk-core.c
+!Iblock/blk-core.c
 !Eblock/blk-map.c
 !Iblock/blk-sysfs.c
 !Eblock/blk-settings.c
 !Eblock/blk-exec.c
 !Eblock/blk-barrier.c
 !Eblock/blk-tag.c
+!Iblock/blk-tag.c
   </chapter>
 
   <chapter id="chrdev">

block/blk-barrier.c

@@ -259,8 +259,11 @@ int blk_do_ordered(struct request_queue *q, struct request **rqp)
 
 static void bio_end_empty_barrier(struct bio *bio, int err)
 {
-	if (err)
+	if (err) {
+		if (err == -EOPNOTSUPP)
+			set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
 		clear_bit(BIO_UPTODATE, &bio->bi_flags);
+	}
 
 	complete(bio->bi_private);
 }
@@ -309,7 +312,9 @@ int blkdev_issue_flush(struct block_device *bdev, sector_t *error_sector)
 		*error_sector = bio->bi_sector;
 
 	ret = 0;
-	if (!bio_flagged(bio, BIO_UPTODATE))
+	if (bio_flagged(bio, BIO_EOPNOTSUPP))
+		ret = -EOPNOTSUPP;
+	else if (!bio_flagged(bio, BIO_UPTODATE))
 		ret = -EIO;
 
 	bio_put(bio);

block/blk-core.c

@@ -127,7 +127,6 @@ void rq_init(struct request_queue *q, struct request *rq)
 	rq->nr_hw_segments = 0;
 	rq->ioprio = 0;
 	rq->special = NULL;
-	rq->raw_data_len = 0;
 	rq->buffer = NULL;
 	rq->tag = -1;
 	rq->errors = 0;
@@ -135,6 +134,7 @@ void rq_init(struct request_queue *q, struct request *rq)
 	rq->cmd_len = 0;
 	memset(rq->cmd, 0, sizeof(rq->cmd));
 	rq->data_len = 0;
+	rq->extra_len = 0;
 	rq->sense_len = 0;
 	rq->data = NULL;
 	rq->sense = NULL;
@@ -424,7 +424,6 @@ void blk_put_queue(struct request_queue *q)
 {
 	kobject_put(&q->kobj);
 }
-EXPORT_SYMBOL(blk_put_queue);
 
 void blk_cleanup_queue(struct request_queue *q)
 {
@@ -592,7 +591,6 @@ int blk_get_queue(struct request_queue *q)
 
 	return 1;
 }
-EXPORT_SYMBOL(blk_get_queue);
 
 static inline void blk_free_request(struct request_queue *q, struct request *rq)
 {
@@ -1768,6 +1766,7 @@ static inline void __end_request(struct request *rq, int uptodate,
 
 /**
  * blk_rq_bytes - Returns bytes left to complete in the entire request
+ * @rq: the request being processed
  **/
 unsigned int blk_rq_bytes(struct request *rq)
 {
@@ -1780,6 +1779,7 @@ EXPORT_SYMBOL_GPL(blk_rq_bytes);
 
 /**
  * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
+ * @rq: the request being processed
  **/
 unsigned int blk_rq_cur_bytes(struct request *rq)
 {
@@ -2016,7 +2016,6 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
 	rq->hard_cur_sectors = rq->current_nr_sectors;
 	rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
 	rq->buffer = bio_data(bio);
-	rq->raw_data_len = bio->bi_size;
 	rq->data_len = bio->bi_size;
 
 	rq->bio = rq->biotail = bio;

block/blk-map.c

@@ -19,7 +19,6 @@ int blk_rq_append_bio(struct request_queue *q, struct request *rq,
 		rq->biotail->bi_next = bio;
 		rq->biotail = bio;
 
-		rq->raw_data_len += bio->bi_size;
 		rq->data_len += bio->bi_size;
 	}
 	return 0;
@@ -44,6 +43,7 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
 			     void __user *ubuf, unsigned int len)
 {
 	unsigned long uaddr;
+	unsigned int alignment;
 	struct bio *bio, *orig_bio;
 	int reading, ret;
 
@@ -54,8 +54,8 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
 	 * direct dma. else, set up kernel bounce buffers
 	 */
 	uaddr = (unsigned long) ubuf;
-	if (!(uaddr & queue_dma_alignment(q)) &&
-	    !(len & queue_dma_alignment(q)))
+	alignment = queue_dma_alignment(q) | q->dma_pad_mask;
+	if (!(uaddr & alignment) && !(len & alignment))
 		bio = bio_map_user(q, NULL, uaddr, len, reading);
 	else
 		bio = bio_copy_user(q, uaddr, len, reading);
@@ -142,20 +142,22 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
 
 	/*
 	 * __blk_rq_map_user() copies the buffers if starting address
-	 * or length isn't aligned.  As the copied buffer is always
-	 * page aligned, we know that there's enough room for padding.
-	 * Extend the last bio and update rq->data_len accordingly.
+	 * or length isn't aligned to dma_pad_mask.  As the copied
+	 * buffer is always page aligned, we know that there's enough
+	 * room for padding.  Extend the last bio and update
+	 * rq->data_len accordingly.
 	 *
 	 * On unmap, bio_uncopy_user() will use unmodified
 	 * bio_map_data pointed to by bio->bi_private.
 	 */
-	if (len & queue_dma_alignment(q)) {
-		unsigned int pad_len = (queue_dma_alignment(q) & ~len) + 1;
-		struct bio *bio = rq->biotail;
+	if (len & q->dma_pad_mask) {
+		unsigned int pad_len = (q->dma_pad_mask & ~len) + 1;
+		struct bio *tail = rq->biotail;
 
-		bio->bi_io_vec[bio->bi_vcnt - 1].bv_len += pad_len;
-		bio->bi_size += pad_len;
-		rq->data_len += pad_len;
+		tail->bi_io_vec[tail->bi_vcnt - 1].bv_len += pad_len;
+		tail->bi_size += pad_len;
+
+		rq->extra_len += pad_len;
 	}
 
 	rq->buffer = rq->data = NULL;
@@ -215,7 +217,6 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
 	rq->buffer = rq->data = NULL;
 	return 0;
 }
-EXPORT_SYMBOL(blk_rq_map_user_iov);
 
 /**
  * blk_rq_unmap_user - unmap a request with user data

block/blk-merge.c

@@ -231,7 +231,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
 			    ((unsigned long)q->dma_drain_buffer) &
 			    (PAGE_SIZE - 1));
 		nsegs++;
-		rq->data_len += q->dma_drain_size;
+		rq->extra_len += q->dma_drain_size;
 	}
 
 	if (sg)

block/blk-settings.c

@@ -140,7 +140,7 @@ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_addr)
 	/* Assume anything <= 4GB can be handled by IOMMU.
 	   Actually some IOMMUs can handle everything, but I don't
 	   know of a way to test this here. */
-	if (b_pfn < (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
+	if (b_pfn <= (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
 		dma = 1;
 	q->bounce_pfn = max_low_pfn;
 #else
@@ -293,8 +293,24 @@ void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
 EXPORT_SYMBOL(blk_queue_stack_limits);
 
 /**
- * blk_queue_dma_drain - Set up a drain buffer for excess dma.
+ * blk_queue_dma_pad - set pad mask
+ * @q:     the request queue for the device
+ * @mask:  pad mask
+ *
+ * Set pad mask.  Direct IO requests are padded to the mask specified.
  *
+ * Appending pad buffer to a request modifies ->data_len such that it
+ * includes the pad buffer.  The original requested data length can be
+ * obtained using blk_rq_raw_data_len().
+ **/
+void blk_queue_dma_pad(struct request_queue *q, unsigned int mask)
+{
+	q->dma_pad_mask = mask;
+}
+EXPORT_SYMBOL(blk_queue_dma_pad);
+
+/**
+ * blk_queue_dma_drain - Set up a drain buffer for excess dma.
  * @q:  the request queue for the device
  * @dma_drain_needed: fn which returns non-zero if drain is necessary
  * @buf:	physically contiguous buffer
@@ -316,7 +332,7 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
  * device can support otherwise there won't be room for the drain
  * buffer.
  */
-extern int blk_queue_dma_drain(struct request_queue *q,
+int blk_queue_dma_drain(struct request_queue *q,
 			       dma_drain_needed_fn *dma_drain_needed,
 			       void *buf, unsigned int size)
 {

block/blk-tag.c

@@ -6,6 +6,8 @@
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 
+#include "blk.h"
+
 /**
  * blk_queue_find_tag - find a request by its tag and queue
  * @q:	 The request queue for the device

block/blk.h

@@ -32,6 +32,8 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect);
 
 void blk_queue_congestion_threshold(struct request_queue *q);
 
+int blk_dev_init(void);
+
 /*
  * Return the threshold (number of used requests) at which the queue is
  * considered to be congested.  It include a little hysteresis to keep the

block/bsg.c

@@ -437,14 +437,14 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
 	}
 
 	if (rq->next_rq) {
-		hdr->dout_resid = rq->raw_data_len;
-		hdr->din_resid = rq->next_rq->raw_data_len;
+		hdr->dout_resid = rq->data_len;
+		hdr->din_resid = rq->next_rq->data_len;
 		blk_rq_unmap_user(bidi_bio);
 		blk_put_request(rq->next_rq);
 	} else if (rq_data_dir(rq) == READ)
-		hdr->din_resid = rq->raw_data_len;
+		hdr->din_resid = rq->data_len;
 	else
-		hdr->dout_resid = rq->raw_data_len;
+		hdr->dout_resid = rq->data_len;
 
 	/*
 	 * If the request generated a negative error number, return it

block/genhd.c

@@ -17,11 +17,15 @@
 #include <linux/buffer_head.h>
 #include <linux/mutex.h>
 
+#include "blk.h"
+
 static DEFINE_MUTEX(block_class_lock);
 #ifndef CONFIG_SYSFS_DEPRECATED
 struct kobject *block_depr;
 #endif
 
+static struct device_type disk_type;
+
 /*
  * Can be deleted altogether. Later.
  *
@@ -346,8 +350,6 @@ const struct seq_operations partitions_op = {
 #endif
 
 
-extern int blk_dev_init(void);
-
 static struct kobject *base_probe(dev_t devt, int *part, void *data)
 {
 	if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0)
@@ -502,7 +504,7 @@ struct class block_class = {
 	.name		= "block",
 };
 
-struct device_type disk_type = {
+static struct device_type disk_type = {
 	.name		= "disk",
 	.groups		= disk_attr_groups,
 	.release	= disk_release,
@@ -632,12 +634,14 @@ static void media_change_notify_thread(struct work_struct *work)
 	put_device(gd->driverfs_dev);
 }
 
+#if 0
 void genhd_media_change_notify(struct gendisk *disk)
 {
 	get_device(disk->driverfs_dev);
 	schedule_work(&disk->async_notify);
 }
 EXPORT_SYMBOL_GPL(genhd_media_change_notify);
+#endif  /*  0  */
 
 dev_t blk_lookup_devt(const char *name)
 {

block/scsi_ioctl.c

@@ -266,7 +266,7 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 	hdr->info = 0;
 	if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 		hdr->info |= SG_INFO_CHECK;
-	hdr->resid = rq->raw_data_len;
+	hdr->resid = rq->data_len;
 	hdr->sb_len_wr = 0;
 
 	if (rq->sense_len && hdr->sbp) {
@@ -528,8 +528,8 @@ static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 	rq = blk_get_request(q, WRITE, __GFP_WAIT);
 	rq->cmd_type = REQ_TYPE_BLOCK_PC;
 	rq->data = NULL;
-	rq->raw_data_len = 0;
 	rq->data_len = 0;
+	rq->extra_len = 0;
 	rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 	memset(rq->cmd, 0, sizeof(rq->cmd));
 	rq->cmd[0] = cmd;

drivers/ata/libata-scsi.c

@@ -862,9 +862,10 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
 		struct request_queue *q = sdev->request_queue;
 		void *buf;
 
-		/* set the min alignment */
+		/* set the min alignment and padding */
 		blk_queue_update_dma_alignment(sdev->request_queue,
 					       ATA_DMA_PAD_SZ - 1);
+		blk_queue_dma_pad(sdev->request_queue, ATA_DMA_PAD_SZ - 1);
 
 		/* configure draining */
 		buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
@@ -2538,7 +2539,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
 	}
 
 	qc->tf.command = ATA_CMD_PACKET;
-	qc->nbytes = scsi_bufflen(scmd);
+	qc->nbytes = scsi_bufflen(scmd) + scmd->request->extra_len;
 
 	/* check whether ATAPI DMA is safe */
 	if (!using_pio && ata_check_atapi_dma(qc))
@@ -2549,7 +2550,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
 	 * want to set it properly, and for DMA where it is
 	 * effectively meaningless.
 	 */
-	nbytes = min(scmd->request->raw_data_len, (unsigned int)63 * 1024);
+	nbytes = min(scmd->request->data_len, (unsigned int)63 * 1024);
 
 	/* Most ATAPI devices which honor transfer chunk size don't
 	 * behave according to the spec when odd chunk size which
@@ -2875,7 +2876,7 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
 	 * TODO: find out if we need to do more here to
 	 *       cover scatter/gather case.
 	 */
-	qc->nbytes = scsi_bufflen(scmd);
+	qc->nbytes = scsi_bufflen(scmd) + scmd->request->extra_len;
 
 	/* request result TF and be quiet about device error */
 	qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;

drivers/block/cciss.c

@@ -33,6 +33,7 @@
 #include <linux/blkpg.h>
 #include <linux/timer.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/hdreg.h>
 #include <linux/spinlock.h>
@@ -131,7 +132,6 @@ static struct board_type products[] = {
 /*define how many times we will try a command because of bus resets */
 #define MAX_CMD_RETRIES 3
 
-#define READ_AHEAD 	 1024
 #define MAX_CTLR	32
 
 /* Originally cciss driver only supports 8 major numbers */
@@ -174,8 +174,6 @@ static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
 static void fail_all_cmds(unsigned long ctlr);
 
 #ifdef CONFIG_PROC_FS
-static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
-			       int length, int *eof, void *data);
 static void cciss_procinit(int i);
 #else
 static void cciss_procinit(int i)
@@ -240,65 +238,77 @@ static inline CommandList_struct *removeQ(CommandList_struct **Qptr,
  */
 #define ENG_GIG 1000000000
 #define ENG_GIG_FACTOR (ENG_GIG/512)
+#define ENGAGE_SCSI	"engage scsi"
 static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
 	"UNKNOWN"
 };
 
 static struct proc_dir_entry *proc_cciss;
 
-static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
-			       int length, int *eof, void *data)
+static void cciss_seq_show_header(struct seq_file *seq)
 {
-	off_t pos = 0;
-	off_t len = 0;
-	int size, i, ctlr;
-	ctlr_info_t *h = (ctlr_info_t *) data;
-	drive_info_struct *drv;
-	unsigned long flags;
-	sector_t vol_sz, vol_sz_frac;
+	ctlr_info_t *h = seq->private;
 
-	ctlr = h->ctlr;
-
-	/* prevent displaying bogus info during configuration
-	 * or deconfiguration of a logical volume
-	 */
-	spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
-	if (h->busy_configuring) {
-		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-		return -EBUSY;
-	}
-	h->busy_configuring = 1;
-	spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-
-	size = sprintf(buffer, "%s: HP %s Controller\n"
+	seq_printf(seq, "%s: HP %s Controller\n"
 		"Board ID: 0x%08lx\n"
 		"Firmware Version: %c%c%c%c\n"
 		"IRQ: %d\n"
 		"Logical drives: %d\n"
-		       "Max sectors: %d\n"
 		"Current Q depth: %d\n"
 		"Current # commands on controller: %d\n"
 		"Max Q depth since init: %d\n"
 		"Max # commands on controller since init: %d\n"
-		       "Max SG entries since init: %d\n\n",
+		"Max SG entries since init: %d\n",
 		h->devname,
 		h->product_name,
 		(unsigned long)h->board_id,
 		h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
 		h->firm_ver[3], (unsigned int)h->intr[SIMPLE_MODE_INT],
 		h->num_luns,
-		       h->cciss_max_sectors,
 		h->Qdepth, h->commands_outstanding,
 		h->maxQsinceinit, h->max_outstanding, h->maxSG);
 
-	pos += size;
-	len += size;
-	cciss_proc_tape_report(ctlr, buffer, &pos, &len);
-	for (i = 0; i <= h->highest_lun; i++) {
+#ifdef CONFIG_CISS_SCSI_TAPE
+	cciss_seq_tape_report(seq, h->ctlr);
+#endif /* CONFIG_CISS_SCSI_TAPE */
+}
+
+static void *cciss_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	ctlr_info_t *h = seq->private;
+	unsigned ctlr = h->ctlr;
+	unsigned long flags;
+
+	/* prevent displaying bogus info during configuration
+	 * or deconfiguration of a logical volume
+	 */
+	spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
+	if (h->busy_configuring) {
+		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+		return ERR_PTR(-EBUSY);
+	}
+	h->busy_configuring = 1;
+	spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+
+	if (*pos == 0)
+		cciss_seq_show_header(seq);
+
+	return pos;
+}
+
+static int cciss_seq_show(struct seq_file *seq, void *v)
+{
+	sector_t vol_sz, vol_sz_frac;
+	ctlr_info_t *h = seq->private;
+	unsigned ctlr = h->ctlr;
+	loff_t *pos = v;
+	drive_info_struct *drv = &h->drv[*pos];
+
+	if (*pos > h->highest_lun)
+		return 0;
 
-		drv = &h->drv[i];
 	if (drv->heads == 0)
-			continue;
+		return 0;
 
 	vol_sz = drv->nr_blocks;
 	vol_sz_frac = sector_div(vol_sz, ENG_GIG_FACTOR);
@@ -307,73 +317,123 @@ static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
 
 	if (drv->raid_level > 5)
 		drv->raid_level = RAID_UNKNOWN;
-		size = sprintf(buffer + len, "cciss/c%dd%d:"
+	seq_printf(seq, "cciss/c%dd%d:"
 			"\t%4u.%02uGB\tRAID %s\n",
-			       ctlr, i, (int)vol_sz, (int)vol_sz_frac,
+			ctlr, (int) *pos, (int)vol_sz, (int)vol_sz_frac,
 			raid_label[drv->raid_level]);
-		pos += size;
-		len += size;
-	}
+	return 0;
+}
+
+static void *cciss_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	ctlr_info_t *h = seq->private;
+
+	if (*pos > h->highest_lun)
+		return NULL;
+	*pos += 1;
+
+	return pos;
+}
+
+static void cciss_seq_stop(struct seq_file *seq, void *v)
+{
+	ctlr_info_t *h = seq->private;
+
+	/* Only reset h->busy_configuring if we succeeded in setting
+	 * it during cciss_seq_start. */
+	if (v == ERR_PTR(-EBUSY))
+		return;
 
-	*eof = 1;
-	*start = buffer + offset;
-	len -= offset;
-	if (len > length)
-		len = length;
 	h->busy_configuring = 0;
-	return len;
 }
 
-static int
-cciss_proc_write(struct file *file, const char __user *buffer,
-		 unsigned long count, void *data)
+static struct seq_operations cciss_seq_ops = {
+	.start = cciss_seq_start,
+	.show  = cciss_seq_show,
+	.next  = cciss_seq_next,
+	.stop  = cciss_seq_stop,
+};
+
+static int cciss_seq_open(struct inode *inode, struct file *file)
 {
-	unsigned char cmd[80];
-	int len;
-#ifdef CONFIG_CISS_SCSI_TAPE
-	ctlr_info_t *h = (ctlr_info_t *) data;
-	int rc;
+	int ret = seq_open(file, &cciss_seq_ops);
+	struct seq_file *seq = file->private_data;
+
+	if (!ret)
+		seq->private = PDE(inode)->data;
+
+	return ret;
+}
+
+static ssize_t
+cciss_proc_write(struct file *file, const char __user *buf,
+		 size_t length, loff_t *ppos)
+{
+	int err;
+	char *buffer;
+
+#ifndef CONFIG_CISS_SCSI_TAPE
+	return -EINVAL;
 #endif
 
-	if (count > sizeof(cmd) - 1)
+	if (!buf || length > PAGE_SIZE - 1)
 		return -EINVAL;
-	if (copy_from_user(cmd, buffer, count))
-		return -EFAULT;
-	cmd[count] = '\0';
-	len = strlen(cmd);	// above 3 lines ensure safety
-	if (len && cmd[len - 1] == '\n')
-		cmd[--len] = '\0';
-#	ifdef CONFIG_CISS_SCSI_TAPE
-	if (strcmp("engage scsi", cmd) == 0) {
+
+	buffer = (char *)__get_free_page(GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	err = -EFAULT;
+	if (copy_from_user(buffer, buf, length))
+		goto out;
+	buffer[length] = '\0';
+
+#ifdef CONFIG_CISS_SCSI_TAPE
+	if (strncmp(ENGAGE_SCSI, buffer, sizeof ENGAGE_SCSI - 1) == 0) {
+		struct seq_file *seq = file->private_data;
+		ctlr_info_t *h = seq->private;
+		int rc;
+
 		rc = cciss_engage_scsi(h->ctlr);
 		if (rc != 0)
-			return -rc;
-		return count;
-	}
+			err = -rc;
+		else
+			err = length;
+	} else
+#endif /* CONFIG_CISS_SCSI_TAPE */
+		err = -EINVAL;
 	/* might be nice to have "disengage" too, but it's not
 	   safely possible. (only 1 module use count, lock issues.) */
-#	endif
-	return -EINVAL;
+
+out:
+	free_page((unsigned long)buffer);
+	return err;
 }
 
-/*
- * Get us a file in /proc/cciss that says something about each controller.
- * Create /proc/cciss if it doesn't exist yet.
- */
+static struct file_operations cciss_proc_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = cciss_seq_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+	.write	 = cciss_proc_write,
+};
+
 static void __devinit cciss_procinit(int i)
 {
 	struct proc_dir_entry *pde;
 
-	if (proc_cciss == NULL) {
+	if (proc_cciss == NULL)
 		proc_cciss = proc_mkdir("cciss", proc_root_driver);
 	if (!proc_cciss)
 		return;
-	}
+	pde = proc_create(hba[i]->devname, S_IWUSR | S_IRUSR | S_IRGRP |
+					S_IROTH, proc_cciss,
+					&cciss_proc_fops);
+	if (!pde)
+		return;
 
-	pde = create_proc_read_entry(hba[i]->devname,
-				     S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH,
-				     proc_cciss, cciss_proc_get_info, hba[i]);
-	pde->write_proc = cciss_proc_write;
+	pde->data = hba[i];
 }
 #endif				/* CONFIG_PROC_FS */
 
@@ -1341,7 +1401,6 @@ static void cciss_update_drive_info(int ctlr, int drv_index)
 		disk->private_data = &h->drv[drv_index];
 
 		/* Set up queue information */
-		disk->queue->backing_dev_info.ra_pages = READ_AHEAD;
 		blk_queue_bounce_limit(disk->queue, hba[ctlr]->pdev->dma_mask);
 
 		/* This is a hardware imposed limit. */
@@ -3434,7 +3493,6 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
 		}
 		drv->queue = q;
 
-		q->backing_dev_info.ra_pages = READ_AHEAD;
 		blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask);
 
 		/* This is a hardware imposed limit. */

drivers/block/cciss_scsi.c

@@ -1404,21 +1404,18 @@ cciss_engage_scsi(int ctlr)
 }
 
 static void
-cciss_proc_tape_report(int ctlr, unsigned char *buffer, off_t *pos, off_t *len)
+cciss_seq_tape_report(struct seq_file *seq, int ctlr)
 {
 	unsigned long flags;
-	int size;
-
-	*pos = *pos -1; *len = *len - 1; // cut off the last trailing newline
 
 	CPQ_TAPE_LOCK(ctlr, flags);
-	size = sprintf(buffer + *len, 
+	seq_printf(seq,
 		"Sequential access devices: %d\n\n",
 			ccissscsi[ctlr].ndevices);
 	CPQ_TAPE_UNLOCK(ctlr, flags);
-	*pos += size; *len += size;
 }
 
+
 /* Need at least one of these error handlers to keep ../scsi/hosts.c from 
  * complaining.  Doing a host- or bus-reset can't do anything good here. 
  * Despite what it might say in scsi_error.c, there may well be commands
@@ -1498,6 +1495,5 @@ static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
 #define cciss_scsi_setup(cntl_num)
 #define cciss_unregister_scsi(ctlr)
 #define cciss_register_scsi(ctlr)
-#define cciss_proc_tape_report(ctlr, buffer, pos, len)
 
 #endif /* CONFIG_CISS_SCSI_TAPE */

drivers/cdrom/cdrom.c

@@ -1152,7 +1152,7 @@ int open_for_data(struct cdrom_device_info * cdi)
 /* This code is similar to that in open_for_data. The routine is called
    whenever an audio play operation is requested.
 */
-int check_for_audio_disc(struct cdrom_device_info * cdi,
+static int check_for_audio_disc(struct cdrom_device_info * cdi,
 				struct cdrom_device_ops * cdo)
 {
         int ret;

fs/proc/proc_misc.c

@@ -32,6 +32,7 @@
 #include <linux/interrupt.h>
 #include <linux/swap.h>
 #include <linux/slab.h>
+#include <linux/genhd.h>
 #include <linux/smp.h>
 #include <linux/signal.h>
 #include <linux/module.h>
@@ -377,7 +378,6 @@ static int stram_read_proc(char *page, char **start, off_t off,
 #endif
 
 #ifdef CONFIG_BLOCK
-extern const struct seq_operations partitions_op;
 static int partitions_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &partitions_op);
@@ -389,7 +389,6 @@ static const struct file_operations proc_partitions_operations = {
 	.release	= seq_release,
 };
 
-extern const struct seq_operations diskstats_op;
 static int diskstats_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &diskstats_op);

fs/splice.c

@@ -1669,6 +1669,13 @@ static int link_pipe(struct pipe_inode_info *ipipe,
 		i++;
 	} while (len);
 
+	/*
+	 * return EAGAIN if we have the potential of some data in the
+	 * future, otherwise just return 0
+	 */
+	if (!ret && ipipe->waiting_writers && (flags & SPLICE_F_NONBLOCK))
+		ret = -EAGAIN;
+
 	inode_double_unlock(ipipe->inode, opipe->inode);
 
 	/*
@@ -1709,11 +1716,8 @@ static long do_tee(struct file *in, struct file *out, size_t len,
 		ret = link_ipipe_prep(ipipe, flags);
 		if (!ret) {
 			ret = link_opipe_prep(opipe, flags);
-			if (!ret) {
+			if (!ret)
 				ret = link_pipe(ipipe, opipe, len, flags);
-				if (!ret && (flags & SPLICE_F_NONBLOCK))
-					ret = -EAGAIN;
-			}
 		}
 	}
 

include/linux/blkdev.h

@@ -216,8 +216,8 @@ struct request {
 	unsigned int cmd_len;
 	unsigned char cmd[BLK_MAX_CDB];
 
-	unsigned int raw_data_len;
 	unsigned int data_len;
+	unsigned int extra_len;	/* length of alignment and padding */
 	unsigned int sense_len;
 	void *data;
 	void *sense;
@@ -362,6 +362,7 @@ struct request_queue
 	unsigned long		seg_boundary_mask;
 	void			*dma_drain_buffer;
 	unsigned int		dma_drain_size;
+	unsigned int		dma_pad_mask;
 	unsigned int		dma_alignment;
 
 	struct blk_queue_tag	*queue_tags;
@@ -701,6 +702,7 @@ extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
 extern void blk_queue_hardsect_size(struct request_queue *, unsigned short);
 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
+extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
 extern int blk_queue_dma_drain(struct request_queue *q,
 			       dma_drain_needed_fn *dma_drain_needed,
 			       void *buf, unsigned int size);

include/linux/genhd.h

@@ -18,11 +18,13 @@
 #define dev_to_disk(device) container_of(device, struct gendisk, dev)
 #define dev_to_part(device) container_of(device, struct hd_struct, dev)
 
-extern struct device_type disk_type;
 extern struct device_type part_type;
 extern struct kobject *block_depr;
 extern struct class block_class;
 
+extern const struct seq_operations partitions_op;
+extern const struct seq_operations diskstats_op;
+
 enum {
 /* These three have identical behaviour; use the second one if DOS FDISK gets
    confused about extended/logical partitions starting past cylinder 1023. */
@@ -556,7 +558,6 @@ extern struct gendisk *alloc_disk_node(int minors, int node_id);
 extern struct gendisk *alloc_disk(int minors);
 extern struct kobject *get_disk(struct gendisk *disk);
 extern void put_disk(struct gendisk *disk);
-extern void genhd_media_change_notify(struct gendisk *disk);
 extern void blk_register_region(dev_t devt, unsigned long range,
 			struct module *module,
 			struct kobject *(*probe)(dev_t, int *, void *),