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raid: adjust to misordered raid table line output

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The libdevmapper interface compares existing table line retrieved from
the kernel to new table line created to decide if it can suppress a reload.
Any difference between input and output of the table line is taken to be a
change thus causing a table reload.

The dm-raid target started to misorder the raid parameters (e.g. 'raid10_copies')
starting with dm-raid target version 1.9.0 up to (excluding) 1.11.0.  This causes
runtime failures (limited to raid10 as of tests) and needs to be reversed to allow
e.g. old lvm2 uspace to run properly.

Check for the aforementioned version range and adjust creation of the table line
to the respective (mis)ordered sequence inside and correct order outside the range
(as described for the raid target in the kernels Documentation/device-mapper/dm-raid.txt).
This commit is contained in:
Heinz Mauelshagen 2017-03-21 18:17:42 +01:00
parent 642d682d8d
commit 1e4462dbfb
4 changed files with 103 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/metadata/segtype.h
View File

@ -288,6 +288,7 @@ struct segment_type *init_unknown_segtype(struct cmd_context *cmd,
#define RAID_FEATURE_RAID4 (1U << 3) /* ! version 1.8 or 1.9.0 */
#define RAID_FEATURE_SHRINK (1U << 4) /* version 1.9.0 */
#define RAID_FEATURE_RESHAPE (1U << 5) /* version 1.10.1 */
#define RAID_FEATURE_PROPER_TABLE_ORDER (1U << 6) /* version >= 1.9.0 and < 1.11.0 had wrong parameter order */
#ifdef RAID_INTERNAL
int init_raid_segtypes(struct cmd_context *cmd, struct segtype_library *seglib);

23
lib/raid/raid.c
View File

@ -228,6 +228,9 @@ static int _raid_text_export(const struct lv_segment *seg, struct formatter *f)
return _raid_text_export_raid(seg, f);
}
static int _raid_target_present(struct cmd_context *cmd,
const struct lv_segment *seg __attribute__((unused)),
unsigned *attributes);
static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
struct dm_pool *mem __attribute__((unused)),
struct cmd_context *cmd __attribute__((unused)),
@ -238,6 +241,7 @@ static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
uint32_t *pvmove_mirror_count __attribute__((unused)))
{
int delta_disks = 0, delta_disks_minus = 0, delta_disks_plus = 0, data_offset = 0;
unsigned attrs;
uint32_t s;
uint64_t flags = 0;
uint64_t rebuilds[RAID_BITMAP_SIZE];
@ -300,6 +304,13 @@ static int _raid_add_target_line(struct dev_manager *dm __attribute__((unused)),
flags = DM_NOSYNC;
}
if (!_raid_target_present(seg->lv->vg->cmd, seg, &attrs))
return_0;
/* RAID target line parameters are in kernel documented order */
if (attrs & RAID_FEATURE_PROPER_TABLE_ORDER)
flags |= DM_RAID_TABLE_ORDERED;
params.raid_type = lvseg_name(seg);
if (seg->segtype->parity_devs) {
@ -479,7 +490,7 @@ static int _raid_target_present(struct cmd_context *cmd,
static int _raid_checked = 0;
static int _raid_present = 0;
static unsigned _raid_attrs = 0;
static unsigned _raid_attrs;
uint32_t maj, min, patchlevel;
unsigned i;
@ -488,6 +499,7 @@ static int _raid_target_present(struct cmd_context *cmd,
if (!_raid_checked) {
_raid_checked = 1;
_raid_attrs = RAID_FEATURE_PROPER_TABLE_ORDER;
if (!(_raid_present = target_present(cmd, TARGET_NAME_RAID, 1)))
return 0;
@ -514,6 +526,15 @@ static int _raid_target_present(struct cmd_context *cmd,
else
log_very_verbose("Target raid does not support %s.",
SEG_TYPE_NAME_RAID4);
/*
* Target version range check:
*
* raid target line parameters were misordered (e.g. 'raid10_copies')
* in target version >= 1.9.0 and < 1.11.0
*/
if (maj == 1 && min >= 9 && min < 11)
_raid_attrs &= ~RAID_FEATURE_PROPER_TABLE_ORDER;
}
if (attributes)

10
libdm/libdevmapper.h
View File

@ -1775,6 +1775,16 @@ int dm_tree_node_add_mirror_target(struct dm_tree_node *node,
#define DM_BLOCK_ON_ERROR 0x00000004 /* On error, suspend I/O */
#define DM_CORELOG 0x00000008 /* In-memory log */
/*
* RAID flag: table line is in kernel documented order.
*
* Target version >= 1.9.0 and < 1.11.0 misordered e.g. 'raid10_copies'
*
* Keep distinct from mirror log ones above because it
* can be passed together with those in load segment flags!
*/
#define DM_RAID_TABLE_ORDERED 0x00000010
int dm_tree_node_add_mirror_target_log(struct dm_tree_node *node,
uint32_t region_size,
unsigned clustered,

102
libdm/libdm-deptree.c
View File

@ -2432,46 +2432,84 @@ static int _raid_emit_segment_line(struct dm_task *dmt, uint32_t major,
EMIT_PARAMS(pos, " raid10_format offset");
#endif
if (seg->data_copies > 1 && type == SEG_RAID10)
EMIT_PARAMS(pos, " raid10_copies %u", seg->data_copies);
if (seg->flags & DM_RAID_TABLE_ORDERED) {
/* Emit order of paramters as of kernel target documentation */
if (seg->flags & DM_NOSYNC)
EMIT_PARAMS(pos, " nosync");
else if (seg->flags & DM_FORCESYNC)
EMIT_PARAMS(pos, " sync");
if (seg->flags & DM_NOSYNC)
EMIT_PARAMS(pos, " nosync");
else if (seg->flags & DM_FORCESYNC)
EMIT_PARAMS(pos, " sync");
for (i = 0; i < area_count; i++)
if (seg->rebuilds[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " rebuild %u", i);
if (seg->region_size)
EMIT_PARAMS(pos, " region_size %u", seg->region_size);
if (seg->min_recovery_rate)
EMIT_PARAMS(pos, " min_recovery_rate %u",
seg->min_recovery_rate);
/* If seg-data_offset == 1, kernel needs a zero offset to adjust to it */
if (seg->data_offset)
EMIT_PARAMS(pos, " data_offset %d", seg->data_offset == 1 ? 0 : seg->data_offset);
if (seg->max_recovery_rate)
EMIT_PARAMS(pos, " max_recovery_rate %u",
seg->max_recovery_rate);
if (seg->delta_disks)
EMIT_PARAMS(pos, " delta_disks %d", seg->delta_disks);
for (i = 0; i < area_count; i++)
if (seg->writemostly[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " write_mostly %u", i);
for (i = 0; i < area_count; i++)
if (seg->rebuilds[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " rebuild %u", i);
if (seg->writebehind)
EMIT_PARAMS(pos, " max_write_behind %u", seg->writebehind);
for (i = 0; i < area_count; i++)
if (seg->writemostly[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " write_mostly %u", i);
if (seg->region_size)
EMIT_PARAMS(pos, " region_size %u", seg->region_size);
if (seg->writebehind)
EMIT_PARAMS(pos, " max_write_behind %u", seg->writebehind);
if (seg->data_copies > 1 && type == SEG_RAID10)
EMIT_PARAMS(pos, " raid10_copies %u", seg->data_copies);
/*
* Has to be before "min_recovery_rate" or the kernels
* check will fail when both set and min > previous max
*/
if (seg->max_recovery_rate)
EMIT_PARAMS(pos, " max_recovery_rate %u",
seg->max_recovery_rate);
if (seg->delta_disks)
EMIT_PARAMS(pos, " delta_disks %d", seg->delta_disks);
if (seg->min_recovery_rate)
EMIT_PARAMS(pos, " min_recovery_rate %u",
seg->min_recovery_rate);
/* If seg-data_offset == 1, kernel needs a zero offset to adjust to it */
if (seg->data_offset)
EMIT_PARAMS(pos, " data_offset %d", seg->data_offset == 1 ? 0 : seg->data_offset);
} else {
/* Target version >= 1.9.0 && < 1.11.0 had a table line parameter ordering flaw */
if (seg->data_copies > 1 && type == SEG_RAID10)
EMIT_PARAMS(pos, " raid10_copies %u", seg->data_copies);
if (seg->flags & DM_NOSYNC)
EMIT_PARAMS(pos, " nosync");
else if (seg->flags & DM_FORCESYNC)
EMIT_PARAMS(pos, " sync");
if (seg->region_size)
EMIT_PARAMS(pos, " region_size %u", seg->region_size);
/* If seg-data_offset == 1, kernel needs a zero offset to adjust to it */
if (seg->data_offset)
EMIT_PARAMS(pos, " data_offset %d", seg->data_offset == 1 ? 0 : seg->data_offset);
if (seg->delta_disks)
EMIT_PARAMS(pos, " delta_disks %d", seg->delta_disks);
for (i = 0; i < area_count; i++)
if (seg->rebuilds[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " rebuild %u", i);
for (i = 0; i < area_count; i++)
if (seg->writemostly[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " write_mostly %u", i);
if (seg->writebehind)
EMIT_PARAMS(pos, " max_write_behind %u", seg->writebehind);
if (seg->max_recovery_rate)
EMIT_PARAMS(pos, " max_recovery_rate %u",
seg->max_recovery_rate);
if (seg->min_recovery_rate)
EMIT_PARAMS(pos, " min_recovery_rate %u",
seg->min_recovery_rate);
}
/* Print number of metadata/data device pairs */
EMIT_PARAMS(pos, " %u", area_count);
@ -2742,7 +2780,7 @@ static int _emit_segment(struct dm_task *dmt, uint32_t major, uint32_t minor,
struct load_segment *seg, uint64_t *seg_start)
{
char *params;
size_t paramsize = 4096;
size_t paramsize = 4096; /* FIXME: too small for long RAID lines when > 64 devices supported */
int ret;
do {