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raid5-ppl: support disk hot add/remove with PPL

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Add a function to modify the log by removing an rdev when a drive fails
or adding when a spare/replacement is activated as a raid member.

Removing a disk just clears the child log rdev pointer. No new stripes
will be accepted for this child log in ppl_write_stripe() and running io
units will be processed without writing PPL to the device.

Adding a disk sets the child log rdev pointer and writes an empty PPL
header.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Artur Paszkiewicz
2017-03-09 10:00:02 +01:00
committed by Shaohua Li
parent 4536bf9ba2
commit 6358c239d8
3 changed files with 64 additions and 2 deletions
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45
drivers/md/raid5-ppl.c
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@@ -400,6 +400,13 @@ static void ppl_submit_iounit(struct ppl_io_unit *io)
struct stripe_head *sh;
int i;
bio->bi_private = io;
if (!log->rdev || test_bit(Faulty, &log->rdev->flags)) {
ppl_log_endio(bio);
return;
}
for (i = 0; i < io->entries_count; i++) {
struct ppl_header_entry *e = &pplhdr->entries[i];
@@ -415,7 +422,6 @@ static void ppl_submit_iounit(struct ppl_io_unit *io)
pplhdr->entries_count = cpu_to_le32(io->entries_count);
pplhdr->checksum = cpu_to_le32(~crc32c_le(~0, pplhdr, PPL_HEADER_SIZE));
bio->bi_private = io;
bio->bi_end_io = ppl_log_endio;
bio->bi_opf = REQ_OP_WRITE | REQ_FUA;
bio->bi_bdev = log->rdev->bdev;
@@ -1190,3 +1196,40 @@ err:
__ppl_exit_log(ppl_conf);
return ret;
}
int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add)
{
struct ppl_conf *ppl_conf = conf->log_private;
struct ppl_log *log;
int ret = 0;
char b[BDEVNAME_SIZE];
if (!rdev)
return -EINVAL;
pr_debug("%s: disk: %d operation: %s dev: %s\n",
__func__, rdev->raid_disk, add ? "add" : "remove",
bdevname(rdev->bdev, b));
if (rdev->raid_disk < 0)
return 0;
if (rdev->raid_disk >= ppl_conf->count)
return -ENODEV;
log = &ppl_conf->child_logs[rdev->raid_disk];
mutex_lock(&log->io_mutex);
if (add) {
ret = ppl_validate_rdev(rdev);
if (!ret) {
log->rdev = rdev;
ret = ppl_write_empty_header(log);
}
} else {
log->rdev = NULL;
}
mutex_unlock(&log->io_mutex);
return ret;
}