Commit 8a9f772c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

* 'for-linus' of git://git.kernel.dk/linux-2.6-block: (27 commits)
  block: remove unused copy_io_context()
  Documentation: remove anticipatory scheduler info
  block: remove REQ_HARDBARRIER
  ioprio: rcu_read_lock/unlock protect find_task_by_vpid call (V2)
  ioprio: fix RCU locking around task dereference
  block: ioctl: fix information leak to userland
  block: read i_size with i_size_read()
  cciss: fix proc warning on attempt to remove non-existant directory
  bio: take care not overflow page count when mapping/copying user data
  block: limit vec count in bio_kmalloc() and bio_alloc_map_data()
  block: take care not to overflow when calculating total iov length
  block: check for proper length of iov entries in blk_rq_map_user_iov()
  cciss: remove controllers supported by hpsa
  cciss: use usleep_range not msleep for small sleeps
  cciss: limit commands allocated on reset_devices
  cciss: Use kernel provided PCI state save and restore functions
  cciss: fix board status waiting code
  drbd: Removed checks for REQ_HARDBARRIER on incomming BIOs
  drbd: REQ_HARDBARRIER -> REQ_FUA transition for meta data accesses
  drbd: Removed the BIO_RW_BARRIER support form the receiver/epoch code
  ...
parents 25a34554 cedb4a7d

Documentation/block/switching-sched.txt

+4 −4
Original line number Diff line number Diff line
@@ -16,7 +16,7 @@ you can do so by typing: 
As of the Linux 2.6.10 kernel, it is now possible to change the

IO scheduler for a given block device on the fly (thus making it possible,

for instance, to set the CFQ scheduler for the system default, but

set a specific device to use the anticipatory or noop schedulers - which

set a specific device to use the deadline or noop schedulers - which

can improve that device's throughput).



To set a specific scheduler, simply do this:
@@ -31,7 +31,7 @@ a "cat /sys/block/DEV/queue/scheduler" - the list of valid names 
will be displayed, with the currently selected scheduler in brackets:



# cat /sys/block/hda/queue/scheduler

noop anticipatory deadline [cfq]

# echo anticipatory > /sys/block/hda/queue/scheduler

noop deadline [cfq]

# echo deadline > /sys/block/hda/queue/scheduler

# cat /sys/block/hda/queue/scheduler

noop [anticipatory] deadline cfq
 
noop [deadline] cfq

Documentation/kernel-parameters.txt

+1 −1
Original line number Diff line number Diff line
@@ -706,7 +706,7 @@ and is between 256 and 4096 characters. It is defined in the file 
			arch/x86/kernel/cpu/cpufreq/elanfreq.c.



	elevator=	[IOSCHED]

			Format: {"anticipatory" | "cfq" | "deadline" | "noop"}

			Format: {"cfq" | "deadline" | "noop"}

			See Documentation/block/as-iosched.txt and

			Documentation/block/deadline-iosched.txt for details.

Documentation/rbtree.txt

+2 −2
Original line number Diff line number Diff line
@@ -21,8 +21,8 @@ three rotations, respectively, to balance the tree), with slightly slower 
To quote Linux Weekly News:



    There are a number of red-black trees in use in the kernel.

    The anticipatory, deadline, and CFQ I/O schedulers all employ

    rbtrees to track requests; the packet CD/DVD driver does the same.

    The deadline and CFQ I/O schedulers employ rbtrees to

    track requests; the packet CD/DVD driver does the same.

    The high-resolution timer code uses an rbtree to organize outstanding

    timer requests.  The ext3 filesystem tracks directory entries in a

    red-black tree.  Virtual memory areas (VMAs) are tracked with red-black

block/blk-core.c

+2 −9
Original line number Diff line number Diff line
@@ -1194,13 +1194,6 @@ static int __make_request(struct request_queue *q, struct bio *bio) 
	int where = ELEVATOR_INSERT_SORT;

	int rw_flags;



	/* REQ_HARDBARRIER is no more */

	if (WARN_ONCE(bio->bi_rw & REQ_HARDBARRIER,

		"block: HARDBARRIER is deprecated, use FLUSH/FUA instead\n")) {

		bio_endio(bio, -EOPNOTSUPP);

		return 0;

	}



	/*

	 * low level driver can indicate that it wants pages above a

	 * certain limit bounced to low memory (ie for highmem, or even
@@ -1351,7 +1344,7 @@ static void handle_bad_sector(struct bio *bio) 
			bdevname(bio->bi_bdev, b),

			bio->bi_rw,

			(unsigned long long)bio->bi_sector + bio_sectors(bio),

			(long long)(bio->bi_bdev->bd_inode->i_size >> 9));

			(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));



	set_bit(BIO_EOF, &bio->bi_flags);

}
@@ -1404,7 +1397,7 @@ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors) 
		return 0;



	/* Test device or partition size, when known. */

	maxsector = bio->bi_bdev->bd_inode->i_size >> 9;

	maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9;

	if (maxsector) {

		sector_t sector = bio->bi_sector;

block/blk-ioc.c

+0 −14
Original line number Diff line number Diff line
@@ -153,20 +153,6 @@ struct io_context *get_io_context(gfp_t gfp_flags, int node) 
}

EXPORT_SYMBOL(get_io_context);



void copy_io_context(struct io_context **pdst, struct io_context **psrc)

{

	struct io_context *src = *psrc;

	struct io_context *dst = *pdst;



	if (src) {

		BUG_ON(atomic_long_read(&src->refcount) == 0);

		atomic_long_inc(&src->refcount);

		put_io_context(dst);

		*pdst = src;

	}

}

EXPORT_SYMBOL(copy_io_context);



static int __init blk_ioc_init(void)

{

	iocontext_cachep = kmem_cache_create("blkdev_ioc",

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