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[PATCH] dm table: store md

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Store an up-pointer to the owning struct mapped_device in every table when it
is created.

Access it with:
  struct mapped_device *dm_table_get_md(struct dm_table *t)

Tables linked to md must be destroyed before the md itself.

Signed-off-by: Mike Anderson <andmike@us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Anderson
2006-03-27 01:17:54 -08:00
committed by Linus Torvalds
parent 9ade92a9a5
commit 1134e5ae79
4 changed files with 40 additions and 17 deletions
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13
drivers/md/dm-table.c
View File

@@ -22,6 +22,7 @@
#define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
struct dm_table {
struct mapped_device *md;
atomic_t holders;
/* btree table */
@@ -206,7 +207,8 @@ 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);
@@ -229,6 +231,7 @@ int dm_table_create(struct dm_table **result, int mode, unsigned num_targets)
}
t->mode = mode;
t->md = md;
*result = t;
return 0;
}
@@ -952,12 +955,20 @@ 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);