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| author | Artur Paszkiewicz <artur.paszkiewicz@intel.com> | 2017-04-04 14:13:57 +0300 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2017-04-10 22:00:49 +0300 |
| commit | 845b9e229fe0716ab6b4d94b4364c99069667b59 (patch) | |
| tree | 8c0ac896475505669b3f8665d053d2660d997e29 /drivers/md/raid5-ppl.c | |
| parent | 94568f64af50bb37c418b200449698cfe7e1da5f (diff) | |
| download | linux-845b9e229fe0716ab6b4d94b4364c99069667b59.tar.xz | |
raid5-ppl: use resize_stripes() when enabling or disabling ppl
Use resize_stripes() instead of raid5_reset_stripe_cache() to allocate
or free sh->ppl_page at runtime for all stripes in the stripe cache.
raid5_reset_stripe_cache() required suspending the mddev and could
deadlock because of GFP_KERNEL allocations.
Move the 'newsize' check to check_reshape() to allow reallocating the
stripes with the same number of disks. Allocate sh->ppl_page in
alloc_stripe() instead of grow_buffers(). Pass 'struct r5conf *conf' as
a parameter to alloc_stripe() because it is needed to check whether to
allocate ppl_page. Add free_stripe() and use it to free stripes rather
than directly call kmem_cache_free(). Also free sh->ppl_page in
free_stripe().
Set MD_HAS_PPL at the end of ppl_init_log() instead of explicitly
setting it in advance and add another parameter to log_init() to allow
calling ppl_init_log() without the bit set. Don't try to calculate
partial parity or add a stripe to log if it does not have ppl_page set.
Enabling ppl can now be performed without suspending the mddev, because
the log won't be used until new stripes are allocated with ppl_page.
Calling mddev_suspend/resume is still necessary when disabling ppl,
because we want all stripes to finish before stopping the log, but
resize_stripes() can be called after mddev_resume() when ppl is no
longer active.
Suggested-by: NeilBrown <neilb@suse.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid5-ppl.c')
| -rw-r--r-- | drivers/md/raid5-ppl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c index 355cf3581ef8..71968cf47d7d 100644 --- a/drivers/md/raid5-ppl.c +++ b/drivers/md/raid5-ppl.c @@ -328,7 +328,7 @@ int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh) struct ppl_io_unit *io = sh->ppl_io; struct ppl_log *log; - if (io || test_bit(STRIPE_SYNCING, &sh->state) || + if (io || test_bit(STRIPE_SYNCING, &sh->state) || !sh->ppl_page || !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || !test_bit(R5_Insync, &sh->dev[sh->pd_idx].flags)) { clear_bit(STRIPE_LOG_TRAPPED, &sh->state); @@ -1204,6 +1204,7 @@ int ppl_init_log(struct r5conf *conf) } conf->log_private = ppl_conf; + set_bit(MD_HAS_PPL, &ppl_conf->mddev->flags); return 0; err: |