autofs4: fix pending mount race

[linux-2.6-omap-h63xx.git] / fs / partitions / check.c

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 739da701ae7b8fec52d10f48392a85509208e286..efef715135d34e459ce450eb24ca41e4234cf471 100644 (file)
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -18,6 +18,7 @@
 #include <linux/fs.h>
 #include <linux/kmod.h>
 #include <linux/ctype.h>
+#include <linux/genhd.h>
 
 #include "check.h"
 
@@ -215,9 +216,25 @@ static ssize_t part_stat_show(struct device *dev,
 {
        struct hd_struct *p = dev_to_part(dev);
 
-       return sprintf(buf, "%8u %8llu %8u %8llu\n",
-                      p->ios[0], (unsigned long long)p->sectors[0],
-                      p->ios[1], (unsigned long long)p->sectors[1]);
+       preempt_disable();
+       part_round_stats(p);
+       preempt_enable();
+       return sprintf(buf,
+               "%8lu %8lu %8llu %8u "
+               "%8lu %8lu %8llu %8u "
+               "%8u %8u %8u"
+               "\n",
+               part_stat_read(p, ios[READ]),
+               part_stat_read(p, merges[READ]),
+               (unsigned long long)part_stat_read(p, sectors[READ]),
+               jiffies_to_msecs(part_stat_read(p, ticks[READ])),
+               part_stat_read(p, ios[WRITE]),
+               part_stat_read(p, merges[WRITE]),
+               (unsigned long long)part_stat_read(p, sectors[WRITE]),
+               jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
+               p->in_flight,
+               jiffies_to_msecs(part_stat_read(p, io_ticks)),
+               jiffies_to_msecs(part_stat_read(p, time_in_queue)));
 }
 
 #ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -273,6 +290,7 @@ static struct attribute_group *part_attr_groups[] = {
 static void part_release(struct device *dev)
 {
        struct hd_struct *p = dev_to_part(dev);
+       free_part_stats(p);
        kfree(p);
 }
 
@@ -312,13 +330,20 @@ void delete_partition(struct gendisk *disk, int part)
        disk->part[part-1] = NULL;
        p->start_sect = 0;
        p->nr_sects = 0;
-       p->ios[0] = p->ios[1] = 0;
-       p->sectors[0] = p->sectors[1] = 0;
+       part_stat_set_all(p, 0);
        kobject_put(p->holder_dir);
        device_del(&p->dev);
        put_device(&p->dev);
 }
 
+static ssize_t whole_disk_show(struct device *dev,
+                              struct device_attribute *attr, char *buf)
+{
+       return 0;
+}
+static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
+                  whole_disk_show, NULL);
+
 void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
 {
        struct hd_struct *p;
@@ -328,6 +353,10 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
        if (!p)
                return;
 
+       if (!init_part_stats(p)) {
+               kfree(p);
+               return;
+       }
        p->start_sect = start;
        p->nr_sects = len;
        p->partno = part;
@@ -352,13 +381,8 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
        device_add(&p->dev);
        partition_sysfs_add_subdir(p);
        p->dev.uevent_suppress = 0;
-       if (flags & ADDPART_FLAG_WHOLEDISK) {
-               static struct attribute addpartattr = {
-                       .name = "whole_disk",
-                       .mode = S_IRUSR | S_IRGRP | S_IROTH,
-               };
-               err = sysfs_create_file(&p->dev.kobj, &addpartattr);
-       }
+       if (flags & ADDPART_FLAG_WHOLEDISK)
+               err = device_create_file(&p->dev, &dev_attr_whole_disk);
 
        /* suppress uevent if the disk supresses it */
        if (!disk->dev.uevent_suppress)
@@ -377,7 +401,7 @@ void register_disk(struct gendisk *disk)
        disk->dev.parent = disk->driverfs_dev;
        disk->dev.devt = MKDEV(disk->major, disk->first_minor);
 
-       strlcpy(disk->dev.bus_id, disk->disk_name, KOBJ_NAME_LEN);
+       strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
        /* ewww... some of these buggers have / in the name... */
        s = strchr(disk->dev.bus_id, '/');
        if (s)
@@ -449,6 +473,10 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
                return 0;
        if (IS_ERR(state))      /* I/O error reading the partition table */
                return -EIO;
+
+       /* tell userspace that the media / partition table may have changed */
+       kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
+
        for (p = 1; p < state->limit; p++) {
                sector_t size = state->parts[p].size;
                sector_t from = state->parts[p].from;