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block: autoconvert trivial BKL users to private mutex

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The block device drivers have all gained new lock_kernel
calls from a recent pushdown, and some of the drivers
were already using the BKL before.

This turns the BKL into a set of per-driver mutexes.
Still need to check whether this is safe to do.

file=$1
name=$2
if grep -q lock_kernel ${file} ; then
    if grep -q 'include.*linux.mutex.h' ${file} ; then
            sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
    else
            sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
    fi
    sed -i ${file} \
        -e "/^#include.*linux.mutex.h/,$ {
                1,/^\(static\|int\|long\)/ {
                     /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);

} }"  \
    -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
    -e '/[      ]*cycle_kernel_lock();/d'
else
    sed -i -e '/include.*\<smp_lock.h\>/d' ${file}  \
                -e '/cycle_kernel_lock()/d'
fi

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2010-06-02 14:28:52 +02:00
parent 613655fa39
commit 2a48fc0ab2
43 changed files with 277 additions and 250 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/md/md.c
View File

@@ -36,7 +36,7 @@
#include <linux/blkdev.h>
#include <linux/sysctl.h>
#include <linux/seq_file.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/buffer_head.h> /* for invalidate_bdev */
#include <linux/poll.h>
#include <linux/ctype.h>
@@ -57,6 +57,7 @@
#define DEBUG 0
#define dprintk(x...) ((void)(DEBUG && printk(x)))
static DEFINE_MUTEX(md_mutex);
#ifndef MODULE
static void autostart_arrays(int part);
@@ -5949,7 +5950,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
mddev_t *mddev = mddev_find(bdev->bd_dev);
int err;
lock_kernel();
mutex_lock(&md_mutex);
if (mddev->gendisk != bdev->bd_disk) {
/* we are racing with mddev_put which is discarding this
* bd_disk.
@@ -5958,7 +5959,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
/* Wait until bdev->bd_disk is definitely gone */
flush_scheduled_work();
/* Then retry the open from the top */
unlock_kernel();
mutex_unlock(&md_mutex);
return -ERESTARTSYS;
}
BUG_ON(mddev != bdev->bd_disk->private_data);
@@ -5972,7 +5973,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
check_disk_size_change(mddev->gendisk, bdev);
out:
unlock_kernel();
mutex_unlock(&md_mutex);
return err;
}
@@ -5981,10 +5982,10 @@ static int md_release(struct gendisk *disk, fmode_t mode)
mddev_t *mddev = disk->private_data;
BUG_ON(!mddev);
lock_kernel();
mutex_lock(&md_mutex);
atomic_dec(&mddev->openers);
mddev_put(mddev);
unlock_kernel();
mutex_unlock(&md_mutex);
return 0;
}