fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / block / genhd.c

diff --git a/block/genhd.c b/block/genhd.c
index 7f406f9..457fdac 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -2,7 +2,6 @@
  *  gendisk handling
  */
 
-#include <linux/config.h>
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/genhd.h>
@@ -15,10 +14,10 @@
 #include <linux/kmod.h>
 #include <linux/kobj_map.h>
 #include <linux/buffer_head.h>
+#include <linux/mutex.h>
 
-static struct subsystem block_subsys;
-
-static DECLARE_MUTEX(block_subsys_sem);
+struct subsystem block_subsys;
+static DEFINE_MUTEX(block_subsys_lock);
 
 /*
  * Can be deleted altogether. Later.
@@ -43,10 +42,10 @@ void blkdev_show(struct seq_file *f, off_t offset)
        struct blk_major_name *dp;
 
        if (offset < BLKDEV_MAJOR_HASH_SIZE) {
-               down(&block_subsys_sem);
+               mutex_lock(&block_subsys_lock);
                for (dp = major_names[offset]; dp; dp = dp->next)
                        seq_printf(f, "%3d %s\n", dp->major, dp->name);
-               up(&block_subsys_sem);
+               mutex_unlock(&block_subsys_lock);
        }
 }
 
@@ -57,7 +56,7 @@ int register_blkdev(unsigned int major, const char *name)
        struct blk_major_name **n, *p;
        int index, ret = 0;
 
-       down(&block_subsys_sem);
+       mutex_lock(&block_subsys_lock);
 
        /* temporary */
        if (major == 0) {
@@ -102,7 +101,7 @@ int register_blkdev(unsigned int major, const char *name)
                kfree(p);
        }
 out:
-       up(&block_subsys_sem);
+       mutex_unlock(&block_subsys_lock);
        return ret;
 }
 
@@ -116,7 +115,7 @@ int unregister_blkdev(unsigned int major, const char *name)
        int index = major_to_index(major);
        int ret = 0;
 
-       down(&block_subsys_sem);
+       mutex_lock(&block_subsys_lock);
        for (n = &major_names[index]; *n; n = &(*n)->next)
                if ((*n)->major == major)
                        break;
@@ -126,7 +125,7 @@ int unregister_blkdev(unsigned int major, const char *name)
                p = *n;
                *n = p->next;
        }
-       up(&block_subsys_sem);
+       mutex_unlock(&block_subsys_lock);
        kfree(p);
 
        return ret;
@@ -220,7 +219,7 @@ static void *part_start(struct seq_file *part, loff_t *pos)
        struct list_head *p;
        loff_t l = *pos;
 
-       down(&block_subsys_sem);
+       mutex_lock(&block_subsys_lock);
        list_for_each(p, &block_subsys.kset.list)
                if (!l--)
                        return list_entry(p, struct gendisk, kobj.entry);
@@ -237,7 +236,7 @@ static void *part_next(struct seq_file *part, void *v, loff_t *pos)
 
 static void part_stop(struct seq_file *part, void *v)
 {
-       up(&block_subsys_sem);
+       mutex_unlock(&block_subsys_lock);
 }
 
 static int show_partition(struct seq_file *part, void *v)
@@ -296,10 +295,15 @@ static struct kobject *base_probe(dev_t dev, int *part, void *data)
 
 static int __init genhd_device_init(void)
 {
-       bdev_map = kobj_map_init(base_probe, &block_subsys_sem);
+       int err;
+
+       bdev_map = kobj_map_init(base_probe, &block_subsys_lock);
        blk_dev_init();
-       subsystem_register(&block_subsys);
-       return 0;
+       err = subsystem_register(&block_subsys);
+       if (err < 0)
+               printk(KERN_WARNING "%s: subsystem_register error: %d\n",
+                       __FUNCTION__, err);
+       return err;
 }
 
 subsys_initcall(genhd_device_init);
@@ -372,8 +376,8 @@ static ssize_t disk_stats_read(struct gendisk * disk, char *page)
        disk_round_stats(disk);
        preempt_enable();
        return sprintf(page,
-               "%8u %8u %8llu %8u "
-               "%8u %8u %8llu %8u "
+               "%8lu %8lu %8llu %8u "
+               "%8lu %8lu %8llu %8u "
                "%8u %8u %8u"
                "\n",
                disk_stat_read(disk, ios[READ]),
@@ -413,6 +417,34 @@ static struct disk_attribute disk_attr_stat = {
        .show   = disk_stats_read
 };
 
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+
+static ssize_t disk_fail_store(struct gendisk * disk,
+                              const char *buf, size_t count)
+{
+       int i;
+
+       if (count > 0 && sscanf(buf, "%d", &i) > 0) {
+               if (i == 0)
+                       disk->flags &= ~GENHD_FL_FAIL;
+               else
+                       disk->flags |= GENHD_FL_FAIL;
+       }
+
+       return count;
+}
+static ssize_t disk_fail_read(struct gendisk * disk, char *page)
+{
+       return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0);
+}
+static struct disk_attribute disk_attr_fail = {
+       .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
+       .store  = disk_fail_store,
+       .show   = disk_fail_read
+};
+
+#endif
+
 static struct attribute * default_attrs[] = {
        &disk_attr_uevent.attr,
        &disk_attr_dev.attr,
@@ -420,6 +452,9 @@ static struct attribute * default_attrs[] = {
        &disk_attr_removable.attr,
        &disk_attr_size.attr,
        &disk_attr_stat.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+       &disk_attr_fail.attr,
+#endif
        NULL,
 };
 
@@ -510,9 +545,7 @@ static struct kset_uevent_ops block_uevent_ops = {
        .uevent         = block_uevent,
 };
 
-/* declare block_subsys. */
-static decl_subsys(block, &ktype_block, &block_uevent_ops);
-
+decl_subsys(block, &ktype_block, &block_uevent_ops);
 
 /*
  * aggregate disk stat collector.  Uses the same stats that the sysfs
@@ -530,7 +563,7 @@ static void *diskstats_start(struct seq_file *part, loff_t *pos)
        loff_t k = *pos;
        struct list_head *p;
 
-       down(&block_subsys_sem);
+       mutex_lock(&block_subsys_lock);
        list_for_each(p, &block_subsys.kset.list)
                if (!k--)
                        return list_entry(p, struct gendisk, kobj.entry);
@@ -547,7 +580,7 @@ static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
 
 static void diskstats_stop(struct seq_file *part, void *v)
 {
-       up(&block_subsys_sem);
+       mutex_unlock(&block_subsys_lock);
 }
 
 static int diskstats_show(struct seq_file *s, void *v)
@@ -567,7 +600,7 @@ static int diskstats_show(struct seq_file *s, void *v)
        preempt_disable();
        disk_round_stats(gp);
        preempt_enable();
-       seq_printf(s, "%4d %4d %s %u %u %llu %u %u %u %llu %u %u %u %u\n",
+       seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
                gp->major, n + gp->first_minor, disk_name(gp, n, buf),
                disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]),
                (unsigned long long)disk_stat_read(gp, sectors[0]),