#include <linux/mutex.h>
#include <asm/atomic.h>
+#define DM_MSG_PREFIX "table"
+
#define MAX_DEPTH 16
#define NODE_SIZE L1_CACHE_BYTES
#define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t))
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);
+ struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
return -ENOMEM;
- memset(t, 0, sizeof(*t));
INIT_LIST_HEAD(&t->devices);
atomic_set(&t->holders, 1);
return 0;
}
+int dm_create_error_table(struct dm_table **result, struct mapped_device *md)
+{
+ struct dm_table *t;
+ sector_t dev_size = 1;
+ int r;
+
+ /*
+ * Find current size of device.
+ * Default to 1 sector if inactive.
+ */
+ t = dm_get_table(md);
+ if (t) {
+ dev_size = dm_table_get_size(t);
+ dm_table_put(t);
+ }
+
+ r = dm_table_create(&t, FMODE_READ, 1, md);
+ if (r)
+ return r;
+
+ r = dm_table_add_target(t, "error", 0, dev_size, NULL);
+ if (r)
+ goto out;
+
+ r = dm_table_complete(t);
+ if (r)
+ goto out;
+
+ *result = t;
+
+out:
+ if (r)
+ dm_table_put(t);
+
+ return r;
+}
+EXPORT_SYMBOL_GPL(dm_create_error_table);
+
static void free_devices(struct list_head *devices)
{
struct list_head *tmp, *next;
}
/*
- * If possible (ie. blk_size[major] is set), this checks an area
- * of a destination device is valid.
+ * If possible, this checks an area of a destination device is valid.
*/
static int check_device_area(struct dm_dev *dd, sector_t start, sector_t len)
{
- sector_t dev_size;
- dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;
+ sector_t dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;
+
+ if (!dev_size)
+ return 1;
+
return ((start < dev_size) && (len <= (dev_size - start)));
}
return 0;
}
-
-int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
- sector_t len, int mode, struct dm_dev **result)
+void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
{
- int r = __table_get_device(ti->table, ti, path,
- start, len, mode, result);
- if (!r) {
- request_queue_t *q = bdev_get_queue((*result)->bdev);
- struct io_restrictions *rs = &ti->limits;
-
- /*
- * Combine the device limits low.
- *
- * FIXME: if we move an io_restriction struct
- * into q this would just be a call to
- * combine_restrictions_low()
- */
+ struct request_queue *q = bdev_get_queue(bdev);
+ struct io_restrictions *rs = &ti->limits;
+
+ /*
+ * Combine the device limits low.
+ *
+ * FIXME: if we move an io_restriction struct
+ * into q this would just be a call to
+ * combine_restrictions_low()
+ */
+ rs->max_sectors =
+ min_not_zero(rs->max_sectors, q->max_sectors);
+
+ /* FIXME: Device-Mapper on top of RAID-0 breaks because DM
+ * currently doesn't honor MD's merge_bvec_fn routine.
+ * In this case, we'll force DM to use PAGE_SIZE or
+ * smaller I/O, just to be safe. A better fix is in the
+ * works, but add this for the time being so it will at
+ * least operate correctly.
+ */
+ if (q->merge_bvec_fn)
rs->max_sectors =
- min_not_zero(rs->max_sectors, q->max_sectors);
+ min_not_zero(rs->max_sectors,
+ (unsigned int) (PAGE_SIZE >> 9));
- /* FIXME: Device-Mapper on top of RAID-0 breaks because DM
- * currently doesn't honor MD's merge_bvec_fn routine.
- * In this case, we'll force DM to use PAGE_SIZE or
- * smaller I/O, just to be safe. A better fix is in the
- * works, but add this for the time being so it will at
- * least operate correctly.
- */
- if (q->merge_bvec_fn)
- rs->max_sectors =
- min_not_zero(rs->max_sectors,
- (unsigned int) (PAGE_SIZE >> 9));
+ rs->max_phys_segments =
+ min_not_zero(rs->max_phys_segments,
+ q->max_phys_segments);
- rs->max_phys_segments =
- min_not_zero(rs->max_phys_segments,
- q->max_phys_segments);
+ rs->max_hw_segments =
+ min_not_zero(rs->max_hw_segments, q->max_hw_segments);
- rs->max_hw_segments =
- min_not_zero(rs->max_hw_segments, q->max_hw_segments);
+ rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size);
- rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size);
+ rs->max_segment_size =
+ min_not_zero(rs->max_segment_size, q->max_segment_size);
- rs->max_segment_size =
- min_not_zero(rs->max_segment_size, q->max_segment_size);
+ rs->seg_boundary_mask =
+ min_not_zero(rs->seg_boundary_mask,
+ q->seg_boundary_mask);
- 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);
+}
+EXPORT_SYMBOL_GPL(dm_set_device_limits);
- rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
- }
+int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
+ sector_t len, int mode, struct dm_dev **result)
+{
+ int r = __table_get_device(ti->table, ti, path,
+ start, len, mode, result);
+
+ if (!r)
+ dm_set_device_limits(ti, (*result)->bdev);
return r;
}
unsigned array_size = 0;
*argc = 0;
+
+ if (!input) {
+ *argvp = NULL;
+ return 0;
+ }
+
argv = realloc_argv(&array_size, argv);
if (!argv)
return -ENOMEM;
memset(tgt, 0, sizeof(*tgt));
if (!len) {
- tgt->error = "zero-length target";
- DMERR("%s", tgt->error);
+ DMERR("%s: zero-length target", dm_device_name(t->md));
return -EINVAL;
}
tgt->type = dm_get_target_type(type);
if (!tgt->type) {
- tgt->error = "unknown target type";
- DMERR("%s", tgt->error);
+ DMERR("%s: %s: unknown target type", dm_device_name(t->md),
+ type);
return -EINVAL;
}
return 0;
bad:
- DMERR("%s", tgt->error);
+ DMERR("%s: %s: %s", dm_device_name(t->md), type, tgt->error);
dm_put_target_type(tgt->type);
return r;
}
return suspend_targets(t, 1);
}
-void dm_table_resume_targets(struct dm_table *t)
+int dm_table_resume_targets(struct dm_table *t)
{
- int i;
+ int i, r = 0;
+
+ for (i = 0; i < t->num_targets; i++) {
+ struct dm_target *ti = t->targets + i;
+
+ if (!ti->type->preresume)
+ continue;
+
+ r = ti->type->preresume(ti);
+ if (r)
+ return r;
+ }
for (i = 0; i < t->num_targets; i++) {
struct dm_target *ti = t->targets + i;
if (ti->type->resume)
ti->type->resume(ti);
}
+
+ return 0;
}
int dm_table_any_congested(struct dm_table *t, int bdi_bits)
devices = dm_table_get_devices(t);
for (d = devices->next; d != devices; d = d->next) {
struct dm_dev *dd = list_entry(d, struct dm_dev, list);
- request_queue_t *q = bdev_get_queue(dd->bdev);
+ struct request_queue *q = bdev_get_queue(dd->bdev);
r |= bdi_congested(&q->backing_dev_info, bdi_bits);
}
for (d = devices->next; d != devices; d = d->next) {
struct dm_dev *dd = list_entry(d, struct dm_dev, list);
- request_queue_t *q = bdev_get_queue(dd->bdev);
+ struct request_queue *q = bdev_get_queue(dd->bdev);
if (q->unplug_fn)
q->unplug_fn(q);
}
}
-int dm_table_flush_all(struct dm_table *t)
-{
- struct list_head *d, *devices = dm_table_get_devices(t);
- int ret = 0;
-
- for (d = devices->next; d != devices; d = d->next) {
- struct dm_dev *dd = list_entry(d, struct dm_dev, list);
- request_queue_t *q = bdev_get_queue(dd->bdev);
- int err;
-
- if (!q->issue_flush_fn)
- err = -EOPNOTSUPP;
- else
- err = q->issue_flush_fn(q, dd->bdev->bd_disk, NULL);
-
- if (!ret)
- ret = err;
- }
-
- return ret;
-}
-
struct mapped_device *dm_table_get_md(struct dm_table *t)
{
dm_get(t->md);
EXPORT_SYMBOL(dm_table_put);
EXPORT_SYMBOL(dm_table_get);
EXPORT_SYMBOL(dm_table_unplug_all);
-EXPORT_SYMBOL(dm_table_flush_all);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff