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o implemeted dm_start_table/dm_add_entry/dm_complete_table as used by

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the /proc interface.
This commit is contained in:
Joe Thornber 2001-08-20 15:22:44 +00:00
parent bf235aa693
commit da44380f86
2 changed files with 84 additions and 50 deletions
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115
driver/device-mapper/dm-table.c
View File

@ -65,38 +65,6 @@ static int _setup_btree_index(int l, struct mapped_device *md)
return 1;
}
struct mapped_device *dm_build_btree(struct mapped_device *md)
{
int n, i;
offset_t *k;
/* how many indexes will the btree have ? */
for (n = _div_up(md->num_targets, KEYS_PER_NODE), i = 1; n != 1; i++)
n = _div_up(n, KEYS_PER_NODE + 1);
md->depth = i;
md->counts[md->depth - 1] = _div_up(md->num_targets, KEYS_PER_NODE);
while (--i)
md->counts[i - 1] = _div_up(md->counts[i], KEYS_PER_NODE + 1);
for (i = 0; i < md->depth; i++) {
size_t s = NODE_SIZE * md->counts[i];
md->index[i] = __aligned(s, NODE_SIZE);
memset(md->index[i], -1, s);
}
/* bottom layer is easy */
for (k = md->index[md->depth - 1], i = 0; i < md->num_targets; i++)
k[i] = t->map[i].high;
/* fill in higher levels */
for (i = md->depth - 1; i; i--)
_setup_btree_index(i - 1, md);
return 1;
}
void dm_free_btree(struct mapped_device *md)
{
int i;
@ -105,6 +73,9 @@ void dm_free_btree(struct mapped_device *md)
__free_aligned(md->targets);
__free_aligned(md->contexts);
md->num_targets = 0;
md->num_allocated = 0;
}
static int _setup_targets(struct mapped_device *md, struct device_table *t)
@ -113,7 +84,7 @@ static int _setup_targets(struct mapped_device *md, struct device_table *t)
offset_t low = 0;
md->num_targets = t->count;
md->targets = __aligned(sizeof(*md->targets) * md->num_targets,
md->targets = vmalloc(sizeof(*md->targets) * md->num_targets,
NODE_SIZE);
for (i = 0; i < md->num_targets; i++) {
@ -135,17 +106,91 @@ static int _setup_targets(struct mapped_device *md, struct device_table *t)
int dm_start_table(struct mapped_device *md)
{
/* if this is active, suspend it */
bit_set(md->state, DM_LOADING);
dm_free_btree(md);
if (!_alloc_targets(2)) /* FIXME: increase once debugged 256 ? */
return 0;
}
int dm_add_entry(struct mapped_device *md, offset_t high,
dm_map_fn target, void *context)
{
if (md->num_targets >= md->num_entries &&
!_alloc_targets(md->num_allocated * 2))
retun -ENOMEM;
md->highs[md->num_targets] = high;
md->targets[md->num_targets] = target;
md->contexts[md->num_targets] = context;
md->num_targets++;
}
int dm_activate_table(struct mapped_device *md)
int dm_complete_table(struct mapped_device *md)
{
int n, i;
offset_t *k;
/* how many indexes will the btree have ? */
for (n = _div_up(md->num_targets, KEYS_PER_NODE), i = 1; n != 1; i++)
n = _div_up(n, KEYS_PER_NODE + 1);
md->depth = i;
md->counts[md->depth - 1] = _div_up(md->num_targets, KEYS_PER_NODE);
while (--i)
md->counts[i - 1] = _div_up(md->counts[i], KEYS_PER_NODE + 1);
for (i = 0; i < md->depth; i++) {
size_t s = NODE_SIZE * md->counts[i];
md->index[i] = vmalloc(s);
memset(md->index[i], -1, s);
}
/* bottom layer is easy */
md->index[md->depth - 1] = md->highs;
/* fill in higher levels */
for (i = md->depth - 1; i; i--)
_setup_btree_index(i - 1, md);
return 1;
}
static int _alloc_targets(int num)
{
offset_t *n_highs;
dm_map_fn *n_targets;
void **n_contexts;
if (!(n_highs = vmalloc(sizeof(*n_highs) * num)))
return 0;
if (!(n_targets = vmalloc(sizeof(*n_targets) * num))) {
vfree(n_highs);
return 0;
}
if (!(n_contexts = vmalloc(sizeof(*n_contexts) * num))) {
vfree(n_highs);
vfree(n_targets);
return 0;
}
memcpy(n_highs, md->highs, sizeof(*n_highs) * md->num_targets);
memcpy(n_targets, md->targets, sizeof(*n_targets) * md->num_targets);
memcpy(n_contexts, md->contexts,
sizeof(*n_contexts) * md->num_targets);
vfree(md->highs);
vfree(md->targets);
vfree(md->contexts);
md->num_allocated = num;
md->highs = n_highs;
md->targets = n_targets;
md->contexts = n_contexts;
return 1;
}

13
driver/device-mapper/dm.h
View File

@ -53,6 +53,7 @@ struct mapped_device {
int num_targets;
int num_allocated;
offset_t *highs;
dm_map_fn *targets;
void **contexts;
@ -92,16 +93,4 @@ int dm_complete_table(struct mapped_device *md);
int dm_init_fs(void);
int dm_fin_fs(void);
/* misc. inlines */
static inline void *__aligned(size_t s, unsigned int align)
{
return vmalloc(s);
}
static inline void __free_aligned(void *ptr)
{
vfree(ptr);
}
#endif