/*
* NAME: resync_comp
*
* DESCRIPTION: Resync the component. Iterate through the raid unit a line at
* a time, read from the good device(s) and write the resync
* device.
*
* PARAMETERS: minor_t mnum - minor number identity of metadevice
* md_raidcs_t *cs - child save struct
*
* RETURN: 0 - successfull
* 1 - failed
* -1 - aborted
*
* LOCKS: Expects Unit Reader Lock to be held across call. Acquires and
* releases Line Reader Lock for per-line I/O.
*/
static void
resync_comp(
minor_t mnum,
md_raidcs_t *cs
)
{
mdi_unit_t *ui;
mr_unit_t *un;
mddb_recid_t recids[2];
rcs_state_t state;
md_dev64_t dev_to_write;
diskaddr_t write_pwstart;
diskaddr_t write_devstart;
md_dev64_t dev;
int resync;
int i;
int single_read = 0;
int err;
int err_cnt;
int last_err;
diskaddr_t line;
diskaddr_t segsincolumn;
size_t bsize;
uint_t line_count;
/*
* hs_state is the state of the hotspare on the column being resynced
* dev_state is the state of the resync target
*/
hs_cmds_t hs_state;
int err_col = -1;
diskaddr_t resync_end_pos;
ui = MDI_UNIT(mnum);
ASSERT(ui != NULL);
un = cs->cs_un;
md_unit_readerexit(ui);
un = (mr_unit_t *)md_io_writerlock(ui);
un = (mr_unit_t *)md_unit_writerlock(ui);
resync = un->un_resync_index;
state = un->un_column[resync].un_devstate;
line_count = un->un_maxio / un->un_segsize;
if (line_count == 0) { /* handle the case of segsize > maxio */
line_count = 1;
bsize = un->un_maxio;
} else
bsize = line_count * un->un_segsize;
un->un_resync_copysize = (uint_t)bsize;
ASSERT(un->c.un_status & MD_UN_RESYNC_ACTIVE);
ASSERT(un->un_column[resync].un_devflags &
(MD_RAID_COPY_RESYNC | MD_RAID_REGEN_RESYNC));
/*
* if the column is not in resync then just bail out.
*/
if (! (un->un_column[resync].un_devstate & RCS_RESYNC)) {
md_unit_writerexit(ui);
md_io_writerexit(ui);
un = (mr_unit_t *)md_unit_readerlock(ui);
return;
}
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_START, SVM_TAG_METADEVICE,
MD_UN2SET(un), MD_SID(un));
/* identify device to write and its start block */
if (un->un_column[resync].un_alt_dev != NODEV64) {
if (raid_open_alt(un, resync)) {
raid_set_state(un, resync, state, 0);
md_unit_writerexit(ui);
md_io_writerexit(ui);
un = (mr_unit_t *)md_unit_readerlock(ui);
cmn_err(CE_WARN, "md: %s: %s open failed replace "
"terminated", md_shortname(MD_SID(un)),
md_devname(MD_UN2SET(un),
un->un_column[resync].un_alt_dev,
NULL, 0));
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_FAILED,
SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un));
return;
}
ASSERT(un->un_column[resync].un_devflags & MD_RAID_COPY_RESYNC);
dev_to_write = un->un_column[resync].un_alt_dev;
write_devstart = un->un_column[resync].un_alt_devstart;
write_pwstart = un->un_column[resync].un_alt_pwstart;
if (un->un_column[resync].un_devflags & MD_RAID_DEV_ERRED) {
single_read = 0;
hs_state = HS_BAD;
} else {
hs_state = HS_FREE;
single_read = 1;
}
un->un_column[resync].un_devflags |= MD_RAID_WRITE_ALT;
} else {
dev_to_write = un->un_column[resync].un_dev;
write_devstart = un->un_column[resync].un_devstart;
write_pwstart = un->un_column[resync].un_pwstart;
single_read = 0;
hs_state = HS_FREE;
ASSERT(un->un_column[resync].un_devflags &
MD_RAID_REGEN_RESYNC);
}
alloc_bufs(cs, dbtob(bsize));
/* initialize pre-write area */
if (init_pw_area(un, dev_to_write, write_pwstart, resync)) {
un->un_column[resync].un_devflags &= ~MD_RAID_WRITE_ALT;
if (un->un_column[resync].un_alt_dev != NODEV64) {
raid_close_alt(un, resync);
}
md_unit_writerexit(ui);
md_io_writerexit(ui);
if (dev_to_write == un->un_column[resync].un_dev)
hs_state = HS_BAD;
err = RAID_RESYNC_WRERROR;
goto resync_comp_error;
}
un->c.un_status &= ~MD_UN_RESYNC_CANCEL;
segsincolumn = un->un_segsincolumn;
err_cnt = raid_state_cnt(un, RCS_ERRED | RCS_LAST_ERRED);
/* commit the record */
md_unit_writerexit(ui);
md_io_writerexit(ui);
/* resync each line of the unit */
for (line = 0; line < segsincolumn; line += line_count) {
/*
* Update address range in child struct and lock the line.
*
* The reader version of the line lock is used since only
* resync will use data beyond un_resync_line_index on the
* resync device.
*/
un = (mr_unit_t *)md_io_readerlock(ui);
if (line + line_count > segsincolumn)
line_count = segsincolumn - line;
resync_end_pos = raid_resync_fillin_cs(line, line_count, cs);
(void) md_unit_readerlock(ui);
ASSERT(un->un_resync_line_index == resync_end_pos);
err = raid_resync_region(cs, line, (int)line_count,
&single_read, &hs_state, &err_col, dev_to_write,
write_devstart);
/*
* if the column failed to resync then stop writing directly
* to the column.
*/
if (err)
un->un_resync_line_index = 0;
md_unit_readerexit(ui);
raid_line_exit(cs);
md_io_readerexit(ui);
if (err)
break;
un = (mr_unit_t *)md_unit_writerlock(ui);
if (raid_state_cnt(un, RCS_ERRED | RCS_LAST_ERRED) != err_cnt) {
err = RAID_RESYNC_STATE;
md_unit_writerexit(ui);
break;
}
md_unit_writerexit(ui);
} /* for */
resync_comp_error:
un = (mr_unit_t *)md_io_writerlock(ui);
(void) md_unit_writerlock(ui);
un->un_column[resync].un_devflags &= ~MD_RAID_WRITE_ALT;
recids[0] = 0;
recids[1] = 0;
switch (err) {
/*
* successful resync
*/
case RAID_RESYNC_OKAY:
/* initialize pre-write area */
if ((un->un_column[resync].un_orig_dev != NODEV64) &&
(un->un_column[resync].un_orig_dev ==
un->un_column[resync].un_alt_dev)) {
/*
* replacing a hot spare
* release the hot spare, which will close the hotspare
* and mark it closed.
*/
raid_hs_release(hs_state, un, &recids[0], resync);
/*
* make the resync target the main device and
* mark open
*/
un->un_column[resync].un_hs_id = 0;
un->un_column[resync].un_dev =
un->un_column[resync].un_orig_dev;
un->un_column[resync].un_devstart =
un->un_column[resync].un_orig_devstart;
un->un_column[resync].un_pwstart =
un->un_column[resync].un_orig_pwstart;
un->un_column[resync].un_devflags |= MD_RAID_DEV_ISOPEN;
/* alt becomes the device so don't close it */
un->un_column[resync].un_devflags &= ~MD_RAID_WRITE_ALT;
un->un_column[resync].un_devflags &=
~MD_RAID_ALT_ISOPEN;
un->un_column[resync].un_alt_dev = NODEV64;
}
raid_set_state(un, resync, RCS_OKAY, 0);
break;
case RAID_RESYNC_WRERROR:
if (HOTSPARED(un, resync) && single_read &&
(un->un_column[resync].un_devflags & MD_RAID_COPY_RESYNC)) {
/*
* this is the case where the resync target is
* bad but there is a good hotspare. In this
* case keep the hotspare, and go back to okay.
*/
raid_set_state(un, resync, RCS_OKAY, 0);
cmn_err(CE_WARN, "md: %s: %s write error, replace "
"terminated", md_shortname(MD_SID(un)),
md_devname(MD_UN2SET(un),
un->un_column[resync].un_orig_dev,
NULL, 0));
break;
}
if (HOTSPARED(un, resync)) {
raid_hs_release(hs_state, un, &recids[0], resync);
un->un_column[resync].un_dev =
un->un_column[resync].un_orig_dev;
un->un_column[resync].un_devstart =
un->un_column[resync].un_orig_devstart;
un->un_column[resync].un_pwstart =
un->un_column[resync].un_orig_pwstart;
}
raid_set_state(un, resync, RCS_ERRED, 0);
if (un->un_column[resync].un_devflags & MD_RAID_REGEN_RESYNC)
dev = un->un_column[resync].un_dev;
else
dev = un->un_column[resync].un_alt_dev;
cmn_err(CE_WARN, "md: %s: %s write error replace terminated",
md_shortname(MD_SID(un)), md_devname(MD_UN2SET(un), dev,
NULL, 0));
break;
case RAID_RESYNC_STATE:
if (HOTSPARED(un, resync) && single_read &&
(un->un_column[resync].un_devflags & MD_RAID_COPY_RESYNC)) {
/*
* this is the case where the resync target is
* bad but there is a good hotspare. In this
* case keep the hotspare, and go back to okay.
*/
raid_set_state(un, resync, RCS_OKAY, 0);
cmn_err(CE_WARN, "md: %s: needs maintenance, replace "
"terminated", md_shortname(MD_SID(un)));
break;
}
if (HOTSPARED(un, resync)) {
raid_hs_release(hs_state, un, &recids[0], resync);
un->un_column[resync].un_dev =
un->un_column[resync].un_orig_dev;
un->un_column[resync].un_devstart =
un->un_column[resync].un_orig_devstart;
un->un_column[resync].un_pwstart =
un->un_column[resync].un_orig_pwstart;
}
break;
case RAID_RESYNC_RDERROR:
if (HOTSPARED(un, resync)) {
raid_hs_release(hs_state, un, &recids[0], resync);
un->un_column[resync].un_dev =
un->un_column[resync].un_orig_dev;
un->un_column[resync].un_devstart =
un->un_column[resync].un_orig_devstart;
un->un_column[resync].un_pwstart =
un->un_column[resync].un_orig_pwstart;
}
if ((resync != err_col) && (err_col != NOCOLUMN))
raid_set_state(un, err_col, RCS_ERRED, 0);
break;
default:
ASSERT(0);
}
if (un->un_column[resync].un_alt_dev != NODEV64) {
raid_close_alt(un, resync);
}
/*
* an io operation may have gotten an error and placed a
* column in erred state. This will abort the resync, which
* will end up in last erred. This is ugly so go through
* the columns and do cleanup
*/
err_cnt = 0;
last_err = 0;
for (i = 0; i < un->un_totalcolumncnt; i++) {
if (un->un_column[i].un_devstate & RCS_OKAY)
continue;
if (i == resync) {
raid_set_state(un, i, RCS_ERRED, 1);
err_cnt++;
} else if (err == RAID_RESYNC_OKAY) {
err_cnt++;
} else {
raid_set_state(un, i, RCS_LAST_ERRED, 1);
last_err++;
}
}
if ((err_cnt == 0) && (last_err == 0))
un->un_state = RUS_OKAY;
else if (last_err == 0) {
un->un_state = RUS_ERRED;
ASSERT(err_cnt == 1);
} else if (last_err > 0) {
un->un_state = RUS_LAST_ERRED;
}
uniqtime32(&un->un_column[resync].un_devtimestamp);
un->un_resync_copysize = 0;
un->un_column[resync].un_devflags &=
~(MD_RAID_REGEN_RESYNC | MD_RAID_COPY_RESYNC);
raid_commit(un, recids);
/* release unit writer lock and acquire unit reader lock */
md_unit_writerexit(ui);
md_io_writerexit(ui);
(void) md_unit_readerlock(ui);
if (err == RAID_RESYNC_OKAY) {
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_DONE,
SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un));
} else {
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_FAILED,
SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un));
if (raid_state_cnt(un, RCS_ERRED |
RCS_LAST_ERRED) > 1) {
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_LASTERRED,
SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un));
} else {
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED,
SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un));
}
}
free_bufs(dbtob(bsize), cs);
}
/*
* NAME: check_comp_4_hs
*
* DESCRIPTION: Check whether the input component has an error and can be
* backed with a hot spare (RCS_ERRED state), and initiate
* a resync if so.
*
* PARAMETERS: mr_unit_t *un - raid unit
* int hs_index - component to check
*
* LOCKS: Expects Unit Writer Lock to be held upon entrance. Releases
* the lock prior to calling raid_resync_unit, then reacquires
* it before returning.
*/
static void
check_comp_4_hs(
mr_unit_t *un,
int hs_index
)
{
mddb_recid_t recids[3];
minor_t mnum = MD_SID(un);
mdi_unit_t *ui;
rcs_state_t state;
diskaddr_t size;
int err;
mr_column_t *col;
md_error_t mde = mdnullerror;
char devname[MD_MAX_CTDLEN];
char hs_devname[MD_MAX_CTDLEN];
set_t setno;
md_dev64_t tmpdev;
diskaddr_t tmpdaddr;
/* initialize */
setno = MD_UN2SET(un);
ui = MDI_UNIT(mnum);
md_unit_readerexit(ui);
(void) md_io_writerlock(ui);
un = (mr_unit_t *)md_unit_writerlock(ui);
col = &un->un_column[hs_index];
/*
* add a hotspare for erred column only if not resyncing
*/
if ((!(COLUMN_STATE(un, hs_index) & RCS_ERRED)) ||
(raid_state_cnt(un, (RCS_ERRED | RCS_LAST_ERRED)) != 1) ||
(raid_state_cnt(un, RCS_RESYNC) > 0)) {
goto errout;
}
recids[0] = 0;
recids[1] = 0;
/* if there is already a hotspare then just return */
if (HOTSPARED(un, hs_index) && (col->un_devstate & RCS_ERRED)) {
raid_hs_release(HS_BAD, un, &recids[0], hs_index);
cmn_err(CE_WARN, "md: %s: %s hotspare errored and released",
md_shortname(mnum),
md_devname(MD_MIN2SET(mnum), col->un_dev, NULL, 0));
col->un_dev = col->un_orig_dev;
col->un_pwstart = col->un_orig_pwstart;
col->un_devstart = col->un_orig_devstart;
raid_commit(un, recids);
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_HS_FREED, SVM_TAG_METADEVICE,
setno, MD_SID(un));
}
ASSERT(!HOTSPARED(un, hs_index));
state = col->un_devstate;
size = col->un_pwstart + un->un_pwsize +
(un->un_segsize * un->un_segsincolumn);
again:
/* quit if resync is already active */
col->un_devflags |= MD_RAID_REGEN_RESYNC;
if (resync_request(mnum, hs_index, 0, NULL))
goto errout;
recids[0] = 0;
recids[1] = 0;
tmpdev = col->un_dev;
tmpdaddr = col->un_hs_pwstart;
/* get a hotspare */
if (md_hot_spare_ifc(HS_GET, un->un_hsp_id, size,
((col->un_orig_pwstart >= 1) &&
(col->un_orig_pwstart != MD_DISKADDR_ERROR)),
&col->un_hs_id, &col->un_hs_key, &tmpdev, &tmpdaddr) != 0) {
col->un_dev = tmpdev;
col->un_hs_pwstart = tmpdaddr;
release_resync_request(mnum);
raid_set_state(un, hs_index, state, 1);
goto errout;
}
col->un_hs_pwstart = tmpdaddr;
/*
* record id is filled in by raid_commit, recids[0] filled in by
* md_hot_spare_ifc if needed
*/
recids[0] = col->un_hs_id;
recids[1] = 0;
/*
* close the device and open the hot spare. The device should
* never be a hotspare here.
*/
if (col->un_devflags & MD_RAID_DEV_ISOPEN) {
md_layered_close(col->un_orig_dev, MD_OFLG_NULL);
col->un_devflags &= ~MD_RAID_DEV_ISOPEN;
}
/*
* Try open by device id
*/
tmpdev = md_resolve_bydevid(mnum, tmpdev, col->un_hs_key);
if (md_layered_open(mnum, &tmpdev, MD_OFLG_NULL)) {
md_dev64_t hs_dev = tmpdev;
/* cannot open return to orig */
raid_hs_release(HS_BAD, un, &recids[0], hs_index);
release_resync_request(mnum);
raid_set_state(un, hs_index, state, 1);
col->un_dev = col->un_orig_dev;
col->un_devstart = col->un_orig_devstart;
col->un_pwstart = col->un_orig_pwstart;
col->un_devflags &= ~MD_RAID_DEV_ISOPEN;
raid_commit(un, recids);
cmn_err(CE_WARN, "md: %s: open error of hotspare %s",
md_shortname(mnum),
md_devname(MD_MIN2SET(mnum), hs_dev, NULL, 0));
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_HS_FREED, SVM_TAG_HS, setno,
MD_SID(un));
goto again;
}
col->un_dev = tmpdev;
col->un_devflags |= MD_RAID_DEV_ISOPEN;
/*
* move the values into the device fields. Since in some cases
* the pwstart is not zero this must be added into the start of
* the hotspare to avoid over writting the label
*/
col->un_hs_pwstart += col->un_orig_pwstart;
col->un_pwstart = col->un_hs_pwstart;
col->un_hs_devstart = col->un_hs_pwstart + un->un_pwsize;
col->un_devstart = col->un_hs_devstart;
/* commit unit and hotspare records and release lock */
raid_commit(un, recids);
md_unit_writerexit(ui);
md_io_writerexit(ui);
err = raid_resync_unit(mnum, &mde);
/* if resync fails, transition back to erred state and reset */
if (err) {
/* reaquire unit writerr lock */
un = (mr_unit_t *)md_unit_writerlock(ui);
raid_set_state(un, hs_index, RCS_ERRED, 0);
/*
* close the hotspare and return it. Then restore the
* original device back to the original state
*/
raid_hs_release(HS_FREE, un, &recids[0], hs_index);
col->un_dev = col->un_orig_dev;
col->un_devstart = col->un_orig_devstart;
col->un_pwstart = col->un_orig_pwstart;
raid_commit(un, recids);
md_unit_writerexit(ui);
un = (mr_unit_t *)md_unit_readerlock(ui);
return;
}
setno = MD_MIN2SET(mnum);
(void) md_devname(setno, col->un_orig_dev, devname,
sizeof (devname));
(void) md_devname(setno, col->un_dev, hs_devname,
sizeof (hs_devname));
cmn_err(CE_NOTE, "md: %s: hotspared device %s with %s",
md_shortname(mnum), devname, hs_devname);
SE_NOTIFY(EC_SVM_STATE, ESC_SVM_HOTSPARED, SVM_TAG_HS, setno,
MD_SID(un));
(void) md_unit_readerlock(ui);
return;
errout:
md_unit_writerexit(ui);
md_io_writerexit(ui);
un = (mr_unit_t *)md_unit_readerlock(ui);
}