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path: root/drivers/md/md.c
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-rw-r--r--drivers/md/md.c104
1 files changed, 46 insertions, 58 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4790c83d78d..aaa3d465de4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -32,31 +32,21 @@
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/module.h>
-#include <linux/kernel.h>
#include <linux/kthread.h>
-#include <linux/linkage.h>
#include <linux/raid/md.h>
#include <linux/raid/bitmap.h>
#include <linux/sysctl.h>
#include <linux/buffer_head.h> /* for invalidate_bdev */
#include <linux/poll.h>
-#include <linux/mutex.h>
#include <linux/ctype.h>
-#include <linux/freezer.h>
-
-#include <linux/init.h>
-
+#include <linux/hdreg.h>
+#include <linux/proc_fs.h>
+#include <linux/random.h>
+#include <linux/reboot.h>
#include <linux/file.h>
-
-#ifdef CONFIG_KMOD
-#include <linux/kmod.h>
-#endif
-
-#include <asm/unaligned.h>
+#include <linux/delay.h>
#define MAJOR_NR MD_MAJOR
-#define MD_DRIVER
/* 63 partitions with the alternate major number (mdp) */
#define MdpMinorShift 6
@@ -66,7 +56,7 @@
#ifndef MODULE
-static void autostart_arrays (int part);
+static void autostart_arrays(int part);
#endif
static LIST_HEAD(pers_list);
@@ -212,7 +202,7 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
)
-static int md_fail_request (struct request_queue *q, struct bio *bio)
+static int md_fail_request(struct request_queue *q, struct bio *bio)
{
bio_io_error(bio);
return 0;
@@ -1464,10 +1454,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
goto fail;
- if (rdev->bdev->bd_part)
- ko = &rdev->bdev->bd_part->dev.kobj;
- else
- ko = &rdev->bdev->bd_disk->dev.kobj;
+ ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
kobject_del(&rdev->kobj);
goto fail;
@@ -2109,8 +2096,6 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
if (strict_strtoull(buf, 10, &size) < 0)
return -EINVAL;
- if (size < my_mddev->size)
- return -EINVAL;
if (my_mddev->pers && rdev->raid_disk >= 0) {
if (my_mddev->persistent) {
size = super_types[my_mddev->major_version].
@@ -2121,9 +2106,9 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
size = (rdev->bdev->bd_inode->i_size >> 10);
size -= rdev->data_offset/2;
}
- if (size < my_mddev->size)
- return -EINVAL; /* component must fit device */
}
+ if (size < my_mddev->size)
+ return -EINVAL; /* component must fit device */
rdev->size = size;
if (size > oldsize && my_mddev->external) {
@@ -2409,12 +2394,11 @@ safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
int i;
unsigned long msec;
char buf[30];
- char *e;
+
/* remove a period, and count digits after it */
if (len >= sizeof(buf))
return -EINVAL;
- strlcpy(buf, cbuf, len);
- buf[len] = 0;
+ strlcpy(buf, cbuf, sizeof(buf));
for (i=0; i<len; i++) {
if (dot) {
if (isdigit(buf[i])) {
@@ -2427,8 +2411,7 @@ safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
buf[i] = 0;
}
}
- msec = simple_strtoul(buf, &e, 10);
- if (e == buf || (*e && *e != '\n'))
+ if (strict_strtoul(buf, 10, &msec) < 0)
return -EINVAL;
msec = (msec * 1000) / scale;
if (msec == 0)
@@ -2730,9 +2713,9 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
break;
case read_auto:
if (mddev->pers) {
- if (mddev->ro != 1)
+ if (mddev->ro == 0)
err = do_md_stop(mddev, 1, 0);
- else
+ else if (mddev->ro == 1)
err = restart_array(mddev);
if (err == 0) {
mddev->ro = 2;
@@ -2948,7 +2931,13 @@ metadata_store(mddev_t *mddev, const char *buf, size_t len)
{
int major, minor;
char *e;
- if (!list_empty(&mddev->disks))
+ /* Changing the details of 'external' metadata is
+ * always permitted. Otherwise there must be
+ * no devices attached to the array.
+ */
+ if (mddev->external && strncmp(buf, "external:", 9) == 0)
+ ;
+ else if (!list_empty(&mddev->disks))
return -EBUSY;
if (cmd_match(buf, "none")) {
@@ -3470,8 +3459,8 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
disk->queue = mddev->queue;
add_disk(disk);
mddev->gendisk = disk;
- error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
- "%s", "md");
+ error = kobject_init_and_add(&mddev->kobj, &md_ktype,
+ &disk_to_dev(disk)->kobj, "%s", "md");
mutex_unlock(&disks_mutex);
if (error)
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
@@ -3530,17 +3519,12 @@ static int do_md_run(mddev_t * mddev)
return -EINVAL;
}
/*
- * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+ * chunk-size has to be a power of 2
*/
if ( (1 << ffz(~chunk_size)) != chunk_size) {
printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
return -EINVAL;
}
- if (chunk_size < PAGE_SIZE) {
- printk(KERN_ERR "too small chunk_size: %d < %ld\n",
- chunk_size, PAGE_SIZE);
- return -EINVAL;
- }
/* devices must have minimum size of one chunk */
rdev_for_each(rdev, tmp, mddev) {
@@ -3558,12 +3542,10 @@ static int do_md_run(mddev_t * mddev)
}
}
-#ifdef CONFIG_KMOD
if (mddev->level != LEVEL_NONE)
request_module("md-level-%d", mddev->level);
else if (mddev->clevel[0])
request_module("md-%s", mddev->clevel);
-#endif
/*
* Drop all container device buffers, from now on
@@ -3761,7 +3743,7 @@ static int do_md_run(mddev_t * mddev)
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify(&mddev->kobj, NULL, "sync_action");
sysfs_notify(&mddev->kobj, NULL, "degraded");
- kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
return 0;
}
@@ -3974,10 +3956,10 @@ static void autorun_array(mddev_t *mddev)
}
printk("\n");
- err = do_md_run (mddev);
+ err = do_md_run(mddev);
if (err) {
printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
- do_md_stop (mddev, 0, 0);
+ do_md_stop(mddev, 0, 0);
}
}
@@ -4336,7 +4318,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
if (!(info->state & (1<<MD_DISK_FAULTY))) {
int err;
- rdev = md_import_device (dev, -1, 0);
+ rdev = md_import_device(dev, -1, 0);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: error, md_import_device() returned %ld\n",
@@ -4418,7 +4400,7 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
return -EINVAL;
}
- rdev = md_import_device (dev, -1, 0);
+ rdev = md_import_device(dev, -1, 0);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: error, md_import_device() returned %ld\n",
@@ -4937,11 +4919,11 @@ static int md_ioctl(struct inode *inode, struct file *file,
goto done_unlock;
case STOP_ARRAY:
- err = do_md_stop (mddev, 0, 1);
+ err = do_md_stop(mddev, 0, 1);
goto done_unlock;
case STOP_ARRAY_RO:
- err = do_md_stop (mddev, 1, 1);
+ err = do_md_stop(mddev, 1, 1);
goto done_unlock;
}
@@ -4990,7 +4972,7 @@ static int md_ioctl(struct inode *inode, struct file *file,
goto done_unlock;
case RUN_ARRAY:
- err = do_md_run (mddev);
+ err = do_md_run(mddev);
goto done_unlock;
case SET_BITMAP_FILE:
@@ -5428,11 +5410,11 @@ static int md_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, " super non-persistent");
if (mddev->pers) {
- mddev->pers->status (seq, mddev);
+ mddev->pers->status(seq, mddev);
seq_printf(seq, "\n ");
if (mddev->pers->sync_request) {
if (mddev->curr_resync > 2) {
- status_resync (seq, mddev);
+ status_resync(seq, mddev);
seq_printf(seq, "\n ");
} else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
seq_printf(seq, "\tresync=DELAYED\n ");
@@ -5549,8 +5531,8 @@ static int is_mddev_idle(mddev_t *mddev)
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
- curr_events = disk_stat_read(disk, sectors[0]) +
- disk_stat_read(disk, sectors[1]) -
+ curr_events = part_stat_read(&disk->part0, sectors[0]) +
+ part_stat_read(&disk->part0, sectors[1]) -
atomic_read(&disk->sync_io);
/* sync IO will cause sync_io to increase before the disk_stats
* as sync_io is counted when a request starts, and
@@ -5761,7 +5743,11 @@ void md_do_sync(mddev_t *mddev)
* time 'round when curr_resync == 2
*/
continue;
- prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
+ /* We need to wait 'interruptible' so as not to
+ * contribute to the load average, and not to
+ * be caught by 'softlockup'
+ */
+ prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
if (!kthread_should_stop() &&
mddev2->curr_resync >= mddev->curr_resync) {
printk(KERN_INFO "md: delaying %s of %s"
@@ -5769,6 +5755,8 @@ void md_do_sync(mddev_t *mddev)
" share one or more physical units)\n",
desc, mdname(mddev), mdname(mddev2));
mddev_put(mddev2);
+ if (signal_pending(current))
+ flush_signals(current);
schedule();
finish_wait(&resync_wait, &wq);
goto try_again;
@@ -6257,7 +6245,7 @@ static int md_notify_reboot(struct notifier_block *this,
* appears to still be in use. Hence
* the '100'.
*/
- do_md_stop (mddev, 1, 100);
+ do_md_stop(mddev, 1, 100);
mddev_unlock(mddev);
}
/*
@@ -6301,7 +6289,7 @@ static int __init md_init(void)
raid_table_header = register_sysctl_table(raid_root_table);
md_geninit();
- return (0);
+ return 0;
}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-15 21:46:15 +0000