Merge branch 'for-3.1/core' of git://git.kernel.dk/linux-block

* 'for-3.1/core' of git://git.kernel.dk/linux-block: (24 commits)
  block: strict rq_affinity
  backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu
  block: fix patch import error in max_discard_sectors check
  block: reorder request_queue to remove 64 bit alignment padding
  CFQ: add think time check for group
  CFQ: add think time check for service tree
  CFQ: move think time check variables to a separate struct
  fixlet: Remove fs_excl from struct task.
  cfq: Remove special treatment for metadata rqs.
  block: document blk_plug list access
  block: avoid building too big plug list
  compat_ioctl: fix make headers_check regression
  block: eliminate potential for infinite loop in blkdev_issue_discard
  compat_ioctl: fix warning caused by qemu
  block: flush MEDIA_CHANGE from drivers on close(2)
  blk-throttle: Make total_nr_queued unsigned
  block: Add __attribute__((format(printf...) and fix fallout
  fs/partitions/check.c: make local symbols static
  block:remove some spare spaces in genhd.c
  block:fix the comment error in blkdev.h
  ...

8 files changed, 51 insertions, 22 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1a23722e8878..0e67c45b3bc9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -73,7 +73,7 @@ enum rq_cmd_type_bits {
 
 /*
  * try to put the fields that are referenced together in the same cacheline.
- * if you modify this structure, be sure to check block/blk-core.c:rq_init()
+ * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init()
  * as well!
  */
 struct request {
@@ -260,8 +260,7 @@ struct queue_limits {
 	unsigned char		discard_zeroes_data;
 };
 
-struct request_queue
-{
+struct request_queue {
 	/*
 	 * Together with queue_head for cacheline sharing
 	 */
@@ -304,14 +303,14 @@ struct request_queue
 	void			*queuedata;
 
 	/*
-	 * queue needs bounce pages for pages above this limit
+	 * various queue flags, see QUEUE_* below
 	 */
-	gfp_t			bounce_gfp;
+	unsigned long		queue_flags;
 
 	/*
-	 * various queue flags, see QUEUE_* below
+	 * queue needs bounce pages for pages above this limit
 	 */
-	unsigned long		queue_flags;
+	gfp_t			bounce_gfp;
 
 	/*
 	 * protects queue structures from reentrancy. ->__queue_lock should
@@ -334,8 +333,8 @@ struct request_queue
 	unsigned int		nr_congestion_off;
 	unsigned int		nr_batching;
 
-	void			*dma_drain_buffer;
 	unsigned int		dma_drain_size;
+	void			*dma_drain_buffer;
 	unsigned int		dma_pad_mask;
 	unsigned int		dma_alignment;
 
@@ -393,7 +392,7 @@ struct request_queue
 #define QUEUE_FLAG_ELVSWITCH	6	/* don't use elevator, just do FIFO */
 #define QUEUE_FLAG_BIDI		7	/* queue supports bidi requests */
 #define QUEUE_FLAG_NOMERGES     8	/* disable merge attempts */
-#define QUEUE_FLAG_SAME_COMP	9	/* force complete on same CPU */
+#define QUEUE_FLAG_SAME_COMP	9	/* complete on same CPU-group */
 #define QUEUE_FLAG_FAIL_IO     10	/* fake timeout */
 #define QUEUE_FLAG_STACKABLE   11	/* supports request stacking */
 #define QUEUE_FLAG_NONROT      12	/* non-rotational device (SSD) */
@@ -403,6 +402,7 @@ struct request_queue
 #define QUEUE_FLAG_NOXMERGES   15	/* No extended merges */
 #define QUEUE_FLAG_ADD_RANDOM  16	/* Contributes to random pool */
 #define QUEUE_FLAG_SECDISCARD  17	/* supports SECDISCARD */
+#define QUEUE_FLAG_SAME_FORCE  18	/* force complete on same CPU */
 
 #define QUEUE_FLAG_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
 				 (1 << QUEUE_FLAG_STACKABLE)	|	\
@@ -857,12 +857,21 @@ struct request_queue *blk_alloc_queue(gfp_t);
 struct request_queue *blk_alloc_queue_node(gfp_t, int);
 extern void blk_put_queue(struct request_queue *);
 
+/*
+ * Note: Code in between changing the blk_plug list/cb_list or element of such
+ * lists is preemptable, but such code can't do sleep (or be very careful),
+ * otherwise data is corrupted. For details, please check schedule() where
+ * blk_schedule_flush_plug() is called.
+ */
 struct blk_plug {
 	unsigned long magic;
 	struct list_head list;
 	struct list_head cb_list;
 	unsigned int should_sort;
+	unsigned int count;
 };
+#define BLK_MAX_REQUEST_COUNT 16
+
 struct blk_plug_cb {
 	struct list_head list;
 	void (*callback)(struct blk_plug_cb *);
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 21a8ebf2dc3a..d800d5142184 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -146,7 +146,7 @@ extern struct request *elv_rb_latter_request(struct request_queue *, struct requ
 /*
  * rb support functions.
  */
-extern struct request *elv_rb_add(struct rb_root *, struct request *);
+extern void elv_rb_add(struct rb_root *, struct request *);
 extern void elv_rb_del(struct rb_root *, struct request *);
 extern struct request *elv_rb_find(struct rb_root *, sector_t);
 
diff --git a/include/linux/fd.h b/include/linux/fd.h
index f5d194af07a8..72202b1b9a6a 100644
--- a/include/linux/fd.h
+++ b/include/linux/fd.h
@@ -377,4 +377,26 @@ struct floppy_raw_cmd {
 #define FDEJECT _IO(2, 0x5a)
 /* eject the disk */
 
+
+#ifdef __KERNEL__
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+
+struct compat_floppy_struct {
+	compat_uint_t	size;
+	compat_uint_t	sect;
+	compat_uint_t	head;
+	compat_uint_t	track;
+	compat_uint_t	stretch;
+	unsigned char	gap;
+	unsigned char	rate;
+	unsigned char	spec1;
+	unsigned char	fmt_gap;
+	const compat_caddr_t name;
+};
+
+#define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
+#endif
+#endif
+
 #endif
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b224dc468a23..0c35d6e767d9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1469,10 +1469,6 @@ enum {
 #define vfs_check_frozen(sb, level) \
 	wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
 
-#define get_fs_excl() atomic_inc(&current->fs_excl)
-#define put_fs_excl() atomic_dec(&current->fs_excl)
-#define has_fs_excl() atomic_read(&current->fs_excl)
-
 /*
  * until VFS tracks user namespaces for inodes, just make all files
  * belong to init_user_ns
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 300d7582006e..02fa4697a0e5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -420,7 +420,7 @@ static inline int get_disk_ro(struct gendisk *disk)
 
 extern void disk_block_events(struct gendisk *disk);
 extern void disk_unblock_events(struct gendisk *disk);
-extern void disk_check_events(struct gendisk *disk);
+extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
 
 /* drivers/char/random.c */
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 580f70c02391..d14e058aaeed 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -176,7 +176,6 @@ extern struct cred init_cred;
 	.alloc_lock	= __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),		\
 	.journal_info	= NULL,						\
 	.cpu_timers	= INIT_CPU_TIMERS(tsk.cpu_timers),		\
-	.fs_excl	= ATOMIC_INIT(0),				\
 	.pi_lock	= __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),	\
 	.timer_slack_ns = 50000, /* 50 usec default slack */		\
 	.pids = {							\
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index b2eee896dcbc..5037a0ad2312 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -5,6 +5,14 @@
 #include <linux/rcupdate.h>
 
 struct cfq_queue;
+struct cfq_ttime {
+	unsigned long last_end_request;
+
+	unsigned long ttime_total;
+	unsigned long ttime_samples;
+	unsigned long ttime_mean;
+};
+
 struct cfq_io_context {
 	void *key;
 
@@ -12,11 +20,7 @@ struct cfq_io_context {
 
 	struct io_context *ioc;
 
-	unsigned long last_end_request;
-
-	unsigned long ttime_total;
-	unsigned long ttime_samples;
-	unsigned long ttime_mean;
+	struct cfq_ttime ttime;
 
 	struct list_head queue_list;
 	struct hlist_node cic_list;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ed766add9b23..20b03bf94748 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1512,7 +1512,6 @@ struct task_struct {
 	short il_next;
 	short pref_node_fork;
 #endif
-	atomic_t fs_excl;	/* holding fs exclusive resources */
 	struct rcu_head rcu;
 
 	/*