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libdm: add dm_tree_node_set_thin_pool_read_only

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Support thin-pool tree node with activation in read-only mode.
(Native kernel API).
This commit is contained in:
Zdenek Kabelac 2015-06-18 15:15:39 +02:00
parent fd1376ebef
commit 69132f55ea
4 changed files with 22 additions and 1 deletions
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1
WHATS_NEW_DM
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@ -1,5 +1,6 @@
Version 1.02.99 -
================================
New dm_tree_node_set_thin_pool_read_only(DM_1_02_99) for read-only thin pool.
Enhance error message when thin-pool message fails.
Version 1.02.98 - 12th June 2015

1
libdm/.exported_symbols.DM_1_02_99 Normal file
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@ -0,0 +1 @@
dm_tree_node_set_thin_pool_read_only

3
libdm/libdevmapper.h
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@ -899,6 +899,9 @@ int dm_tree_node_set_thin_pool_discard(struct dm_tree_node *node,
*/
int dm_tree_node_set_thin_pool_error_if_no_space(struct dm_tree_node *node,
unsigned error_if_no_space);
/* Start thin pool with metadata in read-only mode */
int dm_tree_node_set_thin_pool_read_only(struct dm_tree_node *node,
unsigned read_only);
/*
* FIXME: Defines bellow are based on kernel's dm-thin.c defines
* MAX_DEV_ID ((1 << 24) - 1)

18
libdm/libdm-deptree.c
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@ -205,6 +205,7 @@ struct load_segment {
unsigned ignore_discard; /* Thin_pool target vsn 1.1 */
unsigned no_discard_passdown; /* Thin_pool target vsn 1.1 */
unsigned error_if_no_space; /* Thin pool target vsn 1.10 */
unsigned read_only; /* Thin pool target vsn 1.3 */
uint32_t device_id; /* Thin */
};
@ -2421,6 +2422,7 @@ static int _thin_pool_emit_segment_line(struct dm_task *dmt,
int pos = 0;
char pool[DM_FORMAT_DEV_BUFSIZE], metadata[DM_FORMAT_DEV_BUFSIZE];
int features = (seg->error_if_no_space ? 1 : 0) +
(seg->read_only ? 1 : 0) +
(seg->ignore_discard ? 1 : 0) +
(seg->no_discard_passdown ? 1 : 0) +
(seg->skip_block_zeroing ? 1 : 0);
@ -2431,9 +2433,10 @@ static int _thin_pool_emit_segment_line(struct dm_task *dmt,
if (!_build_dev_string(pool, sizeof(pool), seg->pool))
return_0;
EMIT_PARAMS(pos, "%s %s %d %" PRIu64 " %d%s%s%s%s", metadata, pool,
EMIT_PARAMS(pos, "%s %s %d %" PRIu64 " %d%s%s%s%s%s", metadata, pool,
seg->data_block_size, seg->low_water_mark, features,
seg->error_if_no_space ? " error_if_no_space" : "",
seg->read_only ? " read_only" : "",
seg->skip_block_zeroing ? " skip_block_zeroing" : "",
seg->ignore_discard ? " ignore_discard" : "",
seg->no_discard_passdown ? " no_discard_passdown" : ""
@ -3866,6 +3869,19 @@ int dm_tree_node_set_thin_pool_error_if_no_space(struct dm_tree_node *node,
return 1;
}
int dm_tree_node_set_thin_pool_read_only(struct dm_tree_node *node,
unsigned read_only)
{
struct load_segment *seg;
if (!(seg = _get_single_load_segment(node, SEG_THIN_POOL)))
return_0;
seg->read_only = read_only;
return 1;
}
int dm_tree_node_add_thin_target(struct dm_tree_node *node,
uint64_t size,
const char *pool_uuid,