Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / drivers / md / dm-table.c

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 18e9b99..8f56a54 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -14,6 +14,7 @@
 #include <linux/ctype.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
+#include <linux/mutex.h>
 #include <asm/atomic.h>
 
 #define MAX_DEPTH 16
@@ -22,6 +23,7 @@
 #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
 
 struct dm_table {
+       struct mapped_device *md;
        atomic_t holders;
 
        /* btree table */
@@ -97,6 +99,8 @@ static void combine_restrictions_low(struct io_restrictions *lhs,
 
        lhs->seg_boundary_mask =
                min_not_zero(lhs->seg_boundary_mask, rhs->seg_boundary_mask);
+
+       lhs->no_cluster |= rhs->no_cluster;
 }
 
 /*
@@ -204,7 +208,8 @@ static int alloc_targets(struct dm_table *t, unsigned int num)
        return 0;
 }
 
-int dm_table_create(struct dm_table **result, int mode, unsigned num_targets)
+int dm_table_create(struct dm_table **result, int mode,
+                   unsigned num_targets, struct mapped_device *md)
 {
        struct dm_table *t = kmalloc(sizeof(*t), GFP_KERNEL);
 
@@ -227,6 +232,7 @@ int dm_table_create(struct dm_table **result, int mode, unsigned num_targets)
        }
 
        t->mode = mode;
+       t->md = md;
        *result = t;
        return 0;
 }
@@ -345,20 +351,19 @@ static struct dm_dev *find_device(struct list_head *l, dev_t dev)
 /*
  * Open a device so we can use it as a map destination.
  */
-static int open_dev(struct dm_dev *d, dev_t dev)
+static int open_dev(struct dm_dev *d, dev_t dev, struct mapped_device *md)
 {
        static char *_claim_ptr = "I belong to device-mapper";
        struct block_device *bdev;
 
        int r;
 
-       if (d->bdev)
-               BUG();
+       BUG_ON(d->bdev);
 
        bdev = open_by_devnum(dev, d->mode);
        if (IS_ERR(bdev))
                return PTR_ERR(bdev);
-       r = bd_claim(bdev, _claim_ptr);
+       r = bd_claim_by_disk(bdev, _claim_ptr, dm_disk(md));
        if (r)
                blkdev_put(bdev);
        else
@@ -369,12 +374,12 @@ static int open_dev(struct dm_dev *d, dev_t dev)
 /*
  * Close a device that we've been using.
  */
-static void close_dev(struct dm_dev *d)
+static void close_dev(struct dm_dev *d, struct mapped_device *md)
 {
        if (!d->bdev)
                return;
 
-       bd_release(d->bdev);
+       bd_release_from_disk(d->bdev, dm_disk(md));
        blkdev_put(d->bdev);
        d->bdev = NULL;
 }
@@ -395,7 +400,7 @@ static int check_device_area(struct dm_dev *dd, sector_t start, sector_t len)
  * careful to leave things as they were if we fail to reopen the
  * device.
  */
-static int upgrade_mode(struct dm_dev *dd, int new_mode)
+static int upgrade_mode(struct dm_dev *dd, int new_mode, struct mapped_device *md)
 {
        int r;
        struct dm_dev dd_copy;
@@ -405,9 +410,9 @@ static int upgrade_mode(struct dm_dev *dd, int new_mode)
 
        dd->mode |= new_mode;
        dd->bdev = NULL;
-       r = open_dev(dd, dev);
+       r = open_dev(dd, dev, md);
        if (!r)
-               close_dev(&dd_copy);
+               close_dev(&dd_copy, md);
        else
                *dd = dd_copy;
 
@@ -427,8 +432,7 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
        struct dm_dev *dd;
        unsigned int major, minor;
 
-       if (!t)
-               BUG();
+       BUG_ON(!t);
 
        if (sscanf(path, "%u:%u", &major, &minor) == 2) {
                /* Extract the major/minor numbers */
@@ -450,7 +454,7 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
                dd->mode = mode;
                dd->bdev = NULL;
 
-               if ((r = open_dev(dd, dev))) {
+               if ((r = open_dev(dd, dev, t->md))) {
                        kfree(dd);
                        return r;
                }
@@ -461,7 +465,7 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
                list_add(&dd->list, &t->devices);
 
        } else if (dd->mode != (mode | dd->mode)) {
-               r = upgrade_mode(dd, mode);
+               r = upgrade_mode(dd, mode, t->md);
                if (r)
                        return r;
        }
@@ -508,7 +512,7 @@ int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
                if (q->merge_bvec_fn)
                        rs->max_sectors =
                                min_not_zero(rs->max_sectors,
-                                            (unsigned short)(PAGE_SIZE >> 9));
+                                            (unsigned int) (PAGE_SIZE >> 9));
 
                rs->max_phys_segments =
                        min_not_zero(rs->max_phys_segments,
@@ -525,6 +529,8 @@ int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
                rs->seg_boundary_mask =
                        min_not_zero(rs->seg_boundary_mask,
                                     q->seg_boundary_mask);
+
+               rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
        }
 
        return r;
@@ -536,7 +542,7 @@ int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
 void dm_put_device(struct dm_target *ti, struct dm_dev *dd)
 {
        if (atomic_dec_and_test(&dd->count)) {
-               close_dev(dd);
+               close_dev(dd, ti->table->md);
                list_del(&dd->list);
                kfree(dd);
        }
@@ -638,7 +644,7 @@ int dm_split_args(int *argc, char ***argvp, char *input)
 static void check_for_valid_limits(struct io_restrictions *rs)
 {
        if (!rs->max_sectors)
-               rs->max_sectors = MAX_SECTORS;
+               rs->max_sectors = SAFE_MAX_SECTORS;
        if (!rs->max_phys_segments)
                rs->max_phys_segments = MAX_PHYS_SEGMENTS;
        if (!rs->max_hw_segments)
@@ -765,14 +771,14 @@ int dm_table_complete(struct dm_table *t)
        return r;
 }
 
-static DECLARE_MUTEX(_event_lock);
+static DEFINE_MUTEX(_event_lock);
 void dm_table_event_callback(struct dm_table *t,
                             void (*fn)(void *), void *context)
 {
-       down(&_event_lock);
+       mutex_lock(&_event_lock);
        t->event_fn = fn;
        t->event_context = context;
-       up(&_event_lock);
+       mutex_unlock(&_event_lock);
 }
 
 void dm_table_event(struct dm_table *t)
@@ -783,10 +789,10 @@ void dm_table_event(struct dm_table *t)
         */
        BUG_ON(in_interrupt());
 
-       down(&_event_lock);
+       mutex_lock(&_event_lock);
        if (t->event_fn)
                t->event_fn(t->event_context);
-       up(&_event_lock);
+       mutex_unlock(&_event_lock);
 }
 
 sector_t dm_table_get_size(struct dm_table *t)
@@ -834,6 +840,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
        q->hardsect_size = t->limits.hardsect_size;
        q->max_segment_size = t->limits.max_segment_size;
        q->seg_boundary_mask = t->limits.seg_boundary_mask;
+       if (t->limits.no_cluster)
+               q->queue_flags &= ~(1 << QUEUE_FLAG_CLUSTER);
+       else
+               q->queue_flags |= (1 << QUEUE_FLAG_CLUSTER);
+
 }
 
 unsigned int dm_table_get_num_targets(struct dm_table *t)
@@ -869,11 +880,17 @@ static void suspend_targets(struct dm_table *t, unsigned postsuspend)
 
 void dm_table_presuspend_targets(struct dm_table *t)
 {
+       if (!t)
+               return;
+
        return suspend_targets(t, 0);
 }
 
 void dm_table_postsuspend_targets(struct dm_table *t)
 {
+       if (!t)
+               return;
+
        return suspend_targets(t, 1);
 }
 
@@ -939,11 +956,20 @@ int dm_table_flush_all(struct dm_table *t)
        return ret;
 }
 
+struct mapped_device *dm_table_get_md(struct dm_table *t)
+{
+       dm_get(t->md);
+
+       return t->md;
+}
+
 EXPORT_SYMBOL(dm_vcalloc);
 EXPORT_SYMBOL(dm_get_device);
 EXPORT_SYMBOL(dm_put_device);
 EXPORT_SYMBOL(dm_table_event);
+EXPORT_SYMBOL(dm_table_get_size);
 EXPORT_SYMBOL(dm_table_get_mode);
+EXPORT_SYMBOL(dm_table_get_md);
 EXPORT_SYMBOL(dm_table_put);
 EXPORT_SYMBOL(dm_table_get);
 EXPORT_SYMBOL(dm_table_unplug_all);