This is a note to let you know that I've just added the patch titled
lightnvm: pblk: fix min size for page mempool
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
lightnvm-pblk-fix-min-size-for-page-mempool.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Dec 18 13:29:00 CET 2017
From: Javier González <javier@xxxxxxxxxxxx>
Date: Fri, 13 Oct 2017 14:46:06 +0200
Subject: lightnvm: pblk: fix min size for page mempool
From: Javier González <javier@xxxxxxxxxxxx>
[ Upstream commit bd432417681a224d9fa4a9d43be7d4edc82135b2 ]
pblk uses an internal page mempool for allocating pages on internal
bios. The main two users of this memory pool are partial reads (reads
with some sectors in cache and some on media) and padded writes, which
need to add dummy pages to an existing bio already containing valid
data (and with a large enough bioset allocated). In both cases, the
maximum number of pages per bio is defined by the maximum number of
physical sectors supported by the underlying device.
This patch fixes a bad mempool allocation, where the min_nr of elements
on the pool was fixed (to 16), which is lower than the maximum number
of sectors supported by NVMe (as of the time for this patch). Instead,
use the maximum number of allowed sectors reported by the device.
Reported-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Javier González <javier@xxxxxxxxxxxx>
Signed-off-by: Matias Bjørling <m@xxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/lightnvm/pblk-core.c | 6 +++---
drivers/lightnvm/pblk-init.c | 15 ++++++++-------
drivers/lightnvm/pblk-read.c | 2 +-
drivers/lightnvm/pblk.h | 2 +-
4 files changed, 13 insertions(+), 12 deletions(-)
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -193,7 +193,7 @@ void pblk_bio_free_pages(struct pblk *pb
bio_advance(bio, off * PBLK_EXPOSED_PAGE_SIZE);
for (i = off; i < nr_pages + off; i++) {
bv = bio->bi_io_vec[i];
- mempool_free(bv.bv_page, pblk->page_pool);
+ mempool_free(bv.bv_page, pblk->page_bio_pool);
}
}
@@ -205,14 +205,14 @@ int pblk_bio_add_pages(struct pblk *pblk
int i, ret;
for (i = 0; i < nr_pages; i++) {
- page = mempool_alloc(pblk->page_pool, flags);
+ page = mempool_alloc(pblk->page_bio_pool, flags);
if (!page)
goto err;
ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
if (ret != PBLK_EXPOSED_PAGE_SIZE) {
pr_err("pblk: could not add page to bio\n");
- mempool_free(page, pblk->page_pool);
+ mempool_free(page, pblk->page_bio_pool);
goto err;
}
}
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -132,7 +132,6 @@ static int pblk_rwb_init(struct pblk *pb
}
/* Minimum pages needed within a lun */
-#define PAGE_POOL_SIZE 16
#define ADDR_POOL_SIZE 64
static int pblk_set_ppaf(struct pblk *pblk)
@@ -247,14 +246,16 @@ static int pblk_core_init(struct pblk *p
if (pblk_init_global_caches(pblk))
return -ENOMEM;
- pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0);
- if (!pblk->page_pool)
+ /* internal bios can be at most the sectors signaled by the device. */
+ pblk->page_bio_pool = mempool_create_page_pool(nvm_max_phys_sects(dev),
+ 0);
+ if (!pblk->page_bio_pool)
return -ENOMEM;
pblk->line_ws_pool = mempool_create_slab_pool(PBLK_WS_POOL_SIZE,
pblk_blk_ws_cache);
if (!pblk->line_ws_pool)
- goto free_page_pool;
+ goto free_page_bio_pool;
pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache);
if (!pblk->rec_pool)
@@ -309,8 +310,8 @@ free_rec_pool:
mempool_destroy(pblk->rec_pool);
free_blk_ws_pool:
mempool_destroy(pblk->line_ws_pool);
-free_page_pool:
- mempool_destroy(pblk->page_pool);
+free_page_bio_pool:
+ mempool_destroy(pblk->page_bio_pool);
return -ENOMEM;
}
@@ -322,7 +323,7 @@ static void pblk_core_free(struct pblk *
if (pblk->bb_wq)
destroy_workqueue(pblk->bb_wq);
- mempool_destroy(pblk->page_pool);
+ mempool_destroy(pblk->page_bio_pool);
mempool_destroy(pblk->line_ws_pool);
mempool_destroy(pblk->rec_pool);
mempool_destroy(pblk->g_rq_pool);
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -238,7 +238,7 @@ static int pblk_fill_partial_read_bio(st
kunmap_atomic(src_p);
kunmap_atomic(dst_p);
- mempool_free(src_bv.bv_page, pblk->page_pool);
+ mempool_free(src_bv.bv_page, pblk->page_bio_pool);
hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
} while (hole < nr_secs);
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -618,7 +618,7 @@ struct pblk {
struct list_head compl_list;
- mempool_t *page_pool;
+ mempool_t *page_bio_pool;
mempool_t *line_ws_pool;
mempool_t *rec_pool;
mempool_t *g_rq_pool;
Patches currently in stable-queue which might be from javier@xxxxxxxxxxxx are
queue-4.14/lightnvm-pblk-fix-min-size-for-page-mempool.patch
queue-4.14/lightnvm-pblk-use-right-flag-for-gc-allocation.patch
queue-4.14/lightnvm-pblk-protect-line-bitmap-while-submitting-meta-io.patch
queue-4.14/lightnvm-pblk-initialize-debug-stat-counter.patch