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#1: [PATCH 25/31] mdadm: Add IMSM migration record to intel_super

Posted on 2010-11-09 18:01:24 by adam.kwolek

Add support for IMSM migration record structure.
IMSM migration record is stored on the first two disks of IMSM volume during the migration.

Add function for reading/writing migration record - they will be used by the next checkpointing patches.
Clear migration record every time MIGR_GEN_MIGR is started.

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
---

mdadm/mdadm/super-intel.c | 166 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 161 insertions(+), 5 deletions(-)

diff --git a/mdadm/mdadm/super-intel.c b/mdadm/mdadm/super-intel.c index 549f252..3a34a4a 100644
--- a/mdadm/mdadm/super-intel.c
+++ b/mdadm/mdadm/super-intel.c
@@ -205,6 +205,31 @@ static inline int experimental(void) #endif }

+#define UNIT_SRC_NORMAL 0 /* Source data for curr_migr_unit must
+ * be recovered using srcMap */
+#define UNIT_SRC_IN_CP_AREA 1 /* Source data for curr_migr_unit has
+ * already been migrated and must
+ * be recovered from checkpoint area */ struct migr_record {
+ __u32 rec_status; /* Status used to determine how to restart
+ * migration in case it aborts in some fashion */
+ __u32 curr_migr_unit; /* 0..numMigrUnits-1 */
+ __u32 family_num; /* Family number of MPB containing the RaidDev
+ * that is migrating */
+ __u32 ascending_migr; /* True if migrating in increasing order of lbas */
+ __u32 blocks_per_unit; /* Num disk blocks per unit of operation */
+ __u32 dest_depth_per_unit; /* Num member blocks each destMap member disk
+ * advances per unit-of-operation */
+ __u32 ckpt_area_pba; /* Pba of first block of ckpt copy area */
+ __u32 dest_1st_member_lba; /* First member lba on first stripe of destination */
+ __u32 num_migr_units; /* Total num migration units-of-op */
+ __u32 post_migr_vol_cap; /* Size of volume after migration completes */
+ __u32 post_migr_vol_cap_hi; /* Expansion space for LBA64 */
+ __u32 ckpt_read_disk_num; /* Which member disk in destSubMap[0] the
+ * migration ckpt record was read from
+ * (for recovered migrations) */ } __attribute__
+((__packed__));
+
static __u8 migr_type(struct imsm_dev *dev) {
if (dev->vol.migr_type == MIGR_VERIFY && @@ -250,6 +275,10 @@ struct intel_super {
void *buf; /* O_DIRECT buffer for reading/writing metadata */
struct imsm_super *anchor; /* immovable parameters */
};
+ union {
+ void *migr_rec_buf; /* buffer for I/O operations */
+ struct migr_record *migr_rec; /* migration record */
+ };
size_t len; /* size of the 'buf' allocation */
void *next_buf; /* for realloc'ing buf from the manager */
size_t next_len;
@@ -1493,6 +1522,104 @@ static int imsm_level_to_layout(int level)
return UnSet;
}

+/*
+ * load_imsm_migr_rec - read imsm migration record */
+__attribute__((unused))
+static int load_imsm_migr_rec(struct intel_super *super, struct mdinfo
+*info) {
+ unsigned long long dsize;
+ struct mdinfo *sd;
+ struct dl *dl;
+ char nm[30];
+ int retval = -1;
+ int fd = -1;
+
+ for (sd = info->devs ; sd ; sd = sd->next) {
+ /* read only from one of the first two slots */
+ if (sd->disk.raid_disk > 1)
+ continue;
+ sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
+ fd = dev_open(nm, O_RDONLY);
+ if (fd >= 0)
+ break;
+ }
+ if (fd < 0) {
+ for (dl = super->disks; dl; dl = dl->next) {
+ /* read only from one of the first two slots */
+ if (dl->index > 1)
+ continue;
+ sprintf(nm, "%d:%d", dl->major, dl->minor);
+ fd = dev_open(nm, O_RDONLY);
+ if (fd >= 0)
+ break;
+ }
+ }
+ if (fd < 0)
+ goto out;
+ get_dev_size(fd, NULL, &dsize);
+ if (lseek64(fd, dsize - 512, SEEK_SET) < 0) {
+ fprintf(stderr,
+ Name ": Cannot seek to anchor block: %s\n",
+ strerror(errno));
+ goto out;
+ }
+ if (read(fd, super->migr_rec_buf, 512) != 512) {
+ fprintf(stderr,
+ Name ": Cannot read migr record block: %s\n",
+ strerror(errno));
+ goto out;
+ }
+ retval = 0;
+ out:
+ if (fd >= 0)
+ close(fd);
+ return retval;
+}
+
+/*
+ * write_imsm_migr_rec - write imsm migration record */
+__attribute__((unused))
+static int write_imsm_migr_rec(struct intel_super *super, struct mdinfo
+*info) {
+ unsigned long long dsize;
+ struct mdinfo *sd;
+ char nm[30];
+ int fd = -1;
+ int retval = -1;
+
+ for (sd = info->devs ; sd ; sd = sd->next) {
+ /* read only from one of the first two slots */
+ if (sd->disk.raid_disk > 1)
+ continue;
+ sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
+ fd = dev_open(nm, O_RDWR);
+ if (fd < 0)
+ continue;
+ get_dev_size(fd, NULL, &dsize);
+ if (lseek64(fd, dsize - 512, SEEK_SET) < 0) {
+ fprintf(stderr,
+ Name ": Cannot seek to anchor block: %s\n",
+ strerror(errno));
+ goto out;
+ }
+ if (write(fd, super->migr_rec_buf, 512) != 512) {
+ fprintf(stderr,
+ Name ": Cannot write migr record block: %s\n",
+ strerror(errno));
+ goto out;
+ }
+ close(fd);
+ fd = -1;
+ }
+ retval = 0;
+ out:
+ if (fd >= 0)
+ close(fd);
+ return retval;
+}
+
static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info) {
struct intel_super *super = st->sb;
@@ -2195,8 +2322,11 @@ load_imsm_disk(int fd, struct intel_super *super, char *devname, int keep_fd)
* map1state=normal)
* 4/ Rebuild (migr_state=1 migr_type=MIGR_REBUILD map0state=normal
* map1state=degraded)
+ * 5/ Migration (mig_state=1 migr_type=MIGR_GEN_MIGR map0state=normal
+ * map1state=normal)
*/
-static void migrate(struct imsm_dev *dev, __u8 to_state, int migr_type)
+static void migrate(struct imsm_dev *dev, struct intel_super *super,
+ __u8 to_state, int migr_type)
{
struct imsm_map *dest;
struct imsm_map *src = get_imsm_map(dev, 0); @@ -2219,6 +2349,10 @@ static void migrate(struct imsm_dev *dev, __u8 to_state, int migr_type)
}
}

+ if (migr_type == MIGR_GEN_MIGR)
+ /* Clear migration record */
+ memset(super->migr_rec, 0, sizeof(struct migr_record));
+
src->map_state = to_state;
}

@@ -2377,6 +2511,14 @@ static int load_imsm_mpb(int fd, struct intel_super *super, char *devname)

sectors = mpb_sectors(anchor) - 1;
free(anchor);
+
+ if (posix_memalign(&super->migr_rec_buf, 512, 512) != 0) {
+ fprintf(stderr, Name
+ ": %s could not allocate migr_rec buffer\n", __func__);
+ free(super->buf);
+ return 2;
+ }
+
if (!sectors) {
check_sum = __gen_imsm_checksum(super->anchor);
if (check_sum != __le32_to_cpu(super->anchor->check_sum)) { @@ -2479,6 +2621,10 @@ static void __free_imsm(struct intel_super *super, int free_disks)
free(super->buf);
super->buf = NULL;
}
+ if (super->migr_rec_buf) {
+ free(super->migr_rec_buf);
+ super->migr_rec_buf = NULL;
+ }
if (free_disks)
free_imsm_disks(super);
free_devlist(super);
@@ -3326,6 +3472,13 @@ static int init_super_imsm(struct supertype *st, mdu_array_info_t *info,
": %s could not allocate superblock\n", __func__);
return 0;
}
+ if (posix_memalign(&super->migr_rec_buf, 512, 512) != 0) {
+ fprintf(stderr, Name
+ ": %s could not allocate migr_rec buffer\n", __func__);
+ free(super->buf);
+ free(super);
+ return 0;
+ }
memset(super->buf, 0, mpb_size);
mpb = super->buf;
mpb->mpb_size = __cpu_to_le32(mpb_size); @@ -4827,9 +4980,9 @@ static int imsm_set_array_state(struct active_array *a, int consistent)
/* mark the start of the init process if nothing is failed */
dprintf("imsm: mark resync start\n");
if (map->map_state == IMSM_T_STATE_UNINITIALIZED)
- migrate(dev, IMSM_T_STATE_NORMAL, MIGR_INIT);
+ migrate(dev, super, IMSM_T_STATE_NORMAL, MIGR_INIT);
else
- migrate(dev, IMSM_T_STATE_NORMAL, MIGR_REPAIR);
+ migrate(dev, super, IMSM_T_STATE_NORMAL, MIGR_REPAIR);
super->updates_pending++;
}

@@ -5425,6 +5578,9 @@ static void imsm_process_update(struct supertype *st,
a->reshape_delta_disks = u->reshape_delta_disks;


+ /* Clear migration record */
+ memset(super->migr_rec, 0, sizeof(struct migr_record));
+
super->updates_pending++;
update_reshape_exit:
if (u->devs_mem.dev)
@@ -5621,7 +5777,7 @@ update_reshape_exit:
/* mark rebuild */
to_state = imsm_check_degraded(super, dev, failed);
map->map_state = IMSM_T_STATE_DEGRADED;
- migrate(dev, to_state, MIGR_REBUILD);
+ migrate(dev, super, to_state, MIGR_REBUILD);
migr_map = get_imsm_map(dev, 1);
set_imsm_ord_tbl_ent(map, u->slot, dl->index);
set_imsm_ord_tbl_ent(migr_map, u->slot, dl->index | IMSM_ORD_REBUILD); @@ -6471,7 +6627,7 @@ struct imsm_update_reshape *imsm_create_metadata_update_for_reshape(struct super
*/

to_state = imsm_check_degraded(super, old_dev, 0);
- migrate(upd_devs, to_state, MIGR_GEN_MIGR);
+ migrate(upd_devs, super, to_state, MIGR_GEN_MIGR);
/* second map length is equal to first map
* correct second map length to old value
*/

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