shaba/lvm2
1
0
Fork 0
mirror of git://sourceware.org/git/lvm2.git synced 2024-12-21 13:34:40 +03:00
Code Releases Activity

lvconvert: libdm RAID API compatibility versioning

Browse Source 
Commit 27384c52cf lowered the maximum number of devices
back to 64 for compatibility.

Because more members have been added to the API in
'struct dm_tree_node_raid_params *', we have to version
the public libdm RAID API to not break any existing users.

Changes:

- keep the previous 'struct dm_tree_node_raid_params' and
  dm_tree_node_add_raid_target_with_params()/dm_tree_node_add_raid_target()
  in order to expose the already released public RAID API

- introduce 'struct dm_tree_node_raid_params_v2' and additional functions
  dm_tree_node_add_raid_target_with_params_v2()/dm_tree_node_add_raid_target_v2()
  to be used by the new lvm2 lib reshape extentions

With this new API, the bitfields for rebuild/writemostly legs in
'struct dm_tree_node_raid_params_v2' can be raised to 256 bits
again (253 legs maximum supported in MD kernel).

Mind that we can limit the maximum usable number via the
DEFAULT_RAID{1}_MAX_IMAGES definition in defaults.h.

Related: rhbz834579
Related: rhbz1191935
Related: rhbz1191978
This commit is contained in:
Heinz Mauelshagen 2017-02-28 22:34:00 +01:00
parent 21456dcf7f
commit 80a6de616a
4 changed files with 123 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/raid/raid.c
View File

@ -242,7 +242,7 @@ static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
uint64_t flags = 0;
uint64_t rebuilds[RAID_BITMAP_SIZE];
uint64_t writemostly[RAID_BITMAP_SIZE];
struct dm_tree_node_raid_params params;
struct dm_tree_node_raid_params_v2 params;
memset(&params, 0, sizeof(params));
memset(&rebuilds, 0, sizeof(rebuilds));
@ -333,7 +333,7 @@ static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
params.stripe_size = seg->stripe_size;
params.flags = flags;
if (!dm_tree_node_add_raid_target_with_params(node, len, &params))
if (!dm_tree_node_add_raid_target_with_params_v2(node, len, &params))
return_0;
return add_areas_line(dm, seg, node, 0u, seg->area_count);

2
libdm/.exported_symbols.DM_1_02_138
View File

@ -3,3 +3,5 @@ dm_bit_get_prev
dm_stats_update_regions_from_fd
dm_bitset_parse_list
dm_stats_bind_from_fd
dm_tree_node_add_raid_target_v2
dm_tree_node_add_raid_target_with_params_v2

61
libdm/libdevmapper.h
View File

@ -1,6 +1,6 @@
/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2015 Red Hat, Inc. All rights reserved.
* Copyright (C) 2004-2017 Red Hat, Inc. All rights reserved.
* Copyright (C) 2006 Rackable Systems All rights reserved.
*
* This file is part of the device-mapper userspace tools.
@ -1716,6 +1716,15 @@ int dm_tree_node_add_mirror_target_log(struct dm_tree_node *node,
uint32_t flags);
int dm_tree_node_add_raid_target(struct dm_tree_node *node,
uint64_t size,
const char *raid_type,
uint32_t region_size,
uint32_t stripe_size,
uint64_t rebuilds,
uint64_t flags);
/* Version 2 coping with 253 (MD kernel limitation) devices */
int dm_tree_node_add_raid_target_v2(struct dm_tree_node *node,
uint64_t size,
const char *raid_type,
uint32_t region_size,
@ -1742,13 +1751,7 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node,
/*
* Define number of elements in rebuild and writemostly arrays
* 'of struct dm_tree_node_raid_params'.
*
* Set to one to keep the current libdm API!
*
* If we ever raise the maximum number of RAID devices past 64 thus
* changing the API, we have to version it for backwards API compatibility.
*/
#define RAID_BITMAP_SIZE 1
struct dm_tree_node_raid_params {
const char *raid_type;
@ -1758,6 +1761,42 @@ struct dm_tree_node_raid_params {
uint32_t region_size;
uint32_t stripe_size;
/*
* 'rebuilds' and 'writemostly' are bitfields that signify
* which devices in the array are to be rebuilt or marked
* writemostly. The kernel supports up to 253 legs.
* We limit ourselves by choosing a lower value
* for DEFAULT_RAID{1}_MAX_IMAGES in defaults.h.
*/
uint64_t rebuilds;
uint64_t writemostly;
uint32_t writebehind; /* I/Os (kernel default COUNTER_MAX / 2) */
uint32_t sync_daemon_sleep; /* ms (kernel default = 5sec) */
uint32_t max_recovery_rate; /* kB/sec/disk */
uint32_t min_recovery_rate; /* kB/sec/disk */
uint32_t stripe_cache; /* sectors */
uint64_t flags; /* [no]sync */
uint32_t reserved2;
};
/*
* Version 2 of above node raid params struct to keeep API compatibility.
*
* Extended for more than 64 legs (max 253 in the MD kernel runtime!),
* delta_disks for disk add/remove reshaping,
* data_offset for out-of-place reshaping
* and data_copies for odd number of raid10 legs.
*/
#define RAID_BITMAP_SIZE 4 /* 4 * 64 bit elements in rebuilds/writemostly arrays */
struct dm_tree_node_raid_params_v2 {
const char *raid_type;
uint32_t stripes;
uint32_t mirrors;
uint32_t region_size;
uint32_t stripe_size;
int delta_disks; /* +/- number of disks to add/remove (reshaping) */
int data_offset; /* data offset to set (out-of-place reshaping) */
@ -1771,20 +1810,24 @@ struct dm_tree_node_raid_params {
uint64_t rebuilds[RAID_BITMAP_SIZE];
uint64_t writemostly[RAID_BITMAP_SIZE];
uint32_t writebehind; /* I/Os (kernel default COUNTER_MAX / 2) */
uint32_t data_copies; /* RAID # of data copies */
uint32_t sync_daemon_sleep; /* ms (kernel default = 5sec) */
uint32_t max_recovery_rate; /* kB/sec/disk */
uint32_t min_recovery_rate; /* kB/sec/disk */
uint32_t data_copies; /* RAID # of data copies */
uint32_t stripe_cache; /* sectors */
uint64_t flags; /* [no]sync */
uint64_t reserved2;
};
int dm_tree_node_add_raid_target_with_params(struct dm_tree_node *node,
uint64_t size,
const struct dm_tree_node_raid_params *p);
/* Version 2 API function taking dm_tree_node_raid_params_v2 for aforementioned extensions. */
int dm_tree_node_add_raid_target_with_params_v2(struct dm_tree_node *node,
uint64_t size,
const struct dm_tree_node_raid_params_v2 *p);
/* Cache feature_flags */
#define DM_CACHE_FEATURE_WRITEBACK 0x00000001
#define DM_CACHE_FEATURE_WRITETHROUGH 0x00000002

73
libdm/libdm-deptree.c
View File

@ -3314,14 +3314,13 @@ int dm_tree_node_add_raid_target_with_params(struct dm_tree_node *node,
seg->region_size = p->region_size;
seg->stripe_size = p->stripe_size;
seg->area_count = 0;
seg->delta_disks = p->delta_disks;
seg->data_offset = p->data_offset;
memcpy(seg->rebuilds, p->rebuilds, sizeof(seg->rebuilds));
memcpy(seg->writemostly, p->writemostly, sizeof(seg->writemostly));
memset(seg->rebuilds, 0, sizeof(seg->rebuilds));
seg->rebuilds[0] = p->rebuilds;
memset(seg->writemostly, 0, sizeof(seg->writemostly));
seg->writemostly[0] = p->writemostly;
seg->writebehind = p->writebehind;
seg->min_recovery_rate = p->min_recovery_rate;
seg->max_recovery_rate = p->max_recovery_rate;
seg->data_copies = p->data_copies;
seg->flags = p->flags;
return 1;
@ -3332,10 +3331,70 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node,
const char *raid_type,
uint32_t region_size,
uint32_t stripe_size,
uint64_t *rebuilds,
uint64_t rebuilds,
uint64_t flags)
{
struct dm_tree_node_raid_params params = {
.raid_type = raid_type,
.region_size = region_size,
.stripe_size = stripe_size,
.rebuilds = rebuilds,
.flags = flags
};
return dm_tree_node_add_raid_target_with_params(node, size, &params);
}
/*
* Version 2 of dm_tree_node_add_raid_target() allowing for:
*
* - maximum 253 legs in a raid set (MD kernel limitation)
* - delta_disks for disk add/remove reshaping
* - data_offset for out-of-place reshaping
* - data_copies to cope witth odd numbers of raid10 disks
*/
int dm_tree_node_add_raid_target_with_params_v2(struct dm_tree_node *node,
uint64_t size,
const struct dm_tree_node_raid_params_v2 *p)
{
unsigned i;
struct load_segment *seg = NULL;
for (i = 0; i < DM_ARRAY_SIZE(_dm_segtypes) && !seg; ++i)
if (!strcmp(p->raid_type, _dm_segtypes[i].target))
if (!(seg = _add_segment(node,
_dm_segtypes[i].type, size)))
return_0;
if (!seg) {
log_error("Unsupported raid type %s.", p->raid_type);
return 0;
}
seg->region_size = p->region_size;
seg->stripe_size = p->stripe_size;
seg->area_count = 0;
seg->delta_disks = p->delta_disks;
seg->data_offset = p->data_offset;
memcpy(seg->rebuilds, p->rebuilds, sizeof(seg->rebuilds));
memcpy(seg->writemostly, p->writemostly, sizeof(seg->writemostly));
seg->writebehind = p->writebehind;
seg->data_copies = p->data_copies;
seg->min_recovery_rate = p->min_recovery_rate;
seg->max_recovery_rate = p->max_recovery_rate;
seg->flags = p->flags;
return 1;
}
int dm_tree_node_add_raid_target_v2(struct dm_tree_node *node,
uint64_t size,
const char *raid_type,
uint32_t region_size,
uint32_t stripe_size,
uint64_t *rebuilds,
uint64_t flags)
{
struct dm_tree_node_raid_params_v2 params = {
.raid_type = raid_type,
.region_size = region_size,
.stripe_size = stripe_size,
@ -3344,7 +3403,7 @@ int dm_tree_node_add_raid_target(struct dm_tree_node *node,
memcpy(params.rebuilds, rebuilds, sizeof(params.rebuilds));
return dm_tree_node_add_raid_target_with_params(node, size, &params);
return dm_tree_node_add_raid_target_with_params_v2(node, size, &params);
}
int dm_tree_node_add_cache_target(struct dm_tree_node *node,