Hi Greg,
On Thu, Nov 08, 2018 at 09:23:10AM -0800, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
> The patch below does not apply to the 4.14-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
Instead of backporting it was easier to add the commits it depends on.
1) af097f5d199e ("block: break discard submissions into the user defined size")
It is not marked for stable but seems it can be in stable.
2) b88aef36b87c ("block: fix infinite loop if the device loses discard capability")
It is marked for stable but is not there in 4.14-stable.
All are attached to this mail for you to apply.
--
Regards
Sudip
>From 1be4fbd23b620d384219ba0a1b2ed14a09ac1c01 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Tue, 8 May 2018 15:09:41 -0600
Subject: [PATCH 1/3] block: break discard submissions into the user defined
size
commit af097f5d199e2aa3ab3ef777f0716e487b8f7b08 upstream
Don't build discards bigger than what the user asked for, if the
user decided to limit the size by writing to 'discard_max_bytes'.
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Omar Sandoval <osandov@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
block/blk-lib.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 2bc544ce3d2e..53a45663e688 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -59,10 +59,16 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
unsigned int req_sects;
sector_t end_sect, tmp;
- /* Make sure bi_size doesn't overflow */
- req_sects = min_t(sector_t, nr_sects, UINT_MAX >> 9);
+ /*
+ * Issue in chunks of the user defined max discard setting,
+ * ensuring that bi_size doesn't overflow
+ */
+ req_sects = min_t(sector_t, nr_sects,
+ q->limits.max_discard_sectors);
+ if (req_sects > UINT_MAX >> 9)
+ req_sects = UINT_MAX >> 9;
- /**
+ /*
* If splitting a request, and the next starting sector would be
* misaligned, stop the discard at the previous aligned sector.
*/
--
2.11.0
>From d4a1fe129ccf82570d7add250b77a9b9ee878561 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Tue, 3 Jul 2018 13:34:22 -0400
Subject: [PATCH 2/3] block: fix infinite loop if the device loses discard
capability
commit b88aef36b87c9787a4db724923ec4f57dfd513f3 upstream
If __blkdev_issue_discard is in progress and a device mapper device is
reloaded with a table that doesn't support discard,
q->limits.max_discard_sectors is set to zero. This results in infinite
loop in __blkdev_issue_discard.
This patch checks if max_discard_sectors is zero and aborts with
-EOPNOTSUPP.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Tested-by: Zdenek Kabelac <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
block/blk-lib.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 53a45663e688..0bdc77888dc5 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -65,6 +65,8 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
*/
req_sects = min_t(sector_t, nr_sects,
q->limits.max_discard_sectors);
+ if (!req_sects)
+ goto fail;
if (req_sects > UINT_MAX >> 9)
req_sects = UINT_MAX >> 9;
@@ -102,6 +104,14 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
*biop = bio;
return 0;
+
+fail:
+ if (bio) {
+ submit_bio_wait(bio);
+ bio_put(bio);
+ }
+ *biop = NULL;
+ return -EOPNOTSUPP;
}
EXPORT_SYMBOL(__blkdev_issue_discard);
--
2.11.0
>From 4fe24d18d61cdbf07db6969e506c1751c0fdfc42 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@xxxxxxxxxx>
Date: Fri, 12 Oct 2018 15:53:10 +0800
Subject: [PATCH 3/3] block: don't deal with discard limit in
blkdev_issue_discard()
commit 744889b7cbb56a64f957e65ade7cb65fe3f35714 upstream
blk_queue_split() does respect this limit via bio splitting, so no
need to do that in blkdev_issue_discard(), then we can align to
normal bio submit(bio_add_page() & submit_bio()).
More importantly, this patch fixes one issue introduced in a22c4d7e34402cc
("block: re-add discard_granularity and alignment checks"), in which
zero discard bio may be generated in case of zero alignment.
Fixes: a22c4d7e34402ccdf3 ("block: re-add discard_granularity and alignment checks")
Cc: stable@xxxxxxxxxxxxxxx
Cc: Ming Lin <ming.l@xxxxxxxxxxxxxxx>
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Xiao Ni <xni@xxxxxxxxxx>
Tested-by: Mariusz Dabrowski <mariusz.dabrowski@xxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
block/blk-lib.c | 28 ++--------------------------
1 file changed, 2 insertions(+), 26 deletions(-)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 0bdc77888dc5..3e334b4575ab 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -29,9 +29,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
{
struct request_queue *q = bdev_get_queue(bdev);
struct bio *bio = *biop;
- unsigned int granularity;
unsigned int op;
- int alignment;
sector_t bs_mask;
if (!q)
@@ -51,38 +49,16 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
if ((sector | nr_sects) & bs_mask)
return -EINVAL;
- /* Zero-sector (unknown) and one-sector granularities are the same. */
- granularity = max(q->limits.discard_granularity >> 9, 1U);
- alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
-
while (nr_sects) {
- unsigned int req_sects;
- sector_t end_sect, tmp;
+ unsigned int req_sects = nr_sects;
+ sector_t end_sect;
- /*
- * Issue in chunks of the user defined max discard setting,
- * ensuring that bi_size doesn't overflow
- */
- req_sects = min_t(sector_t, nr_sects,
- q->limits.max_discard_sectors);
if (!req_sects)
goto fail;
if (req_sects > UINT_MAX >> 9)
req_sects = UINT_MAX >> 9;
- /*
- * If splitting a request, and the next starting sector would be
- * misaligned, stop the discard at the previous aligned sector.
- */
end_sect = sector + req_sects;
- tmp = end_sect;
- if (req_sects < nr_sects &&
- sector_div(tmp, granularity) != alignment) {
- end_sect = end_sect - alignment;
- sector_div(end_sect, granularity);
- end_sect = end_sect * granularity + alignment;
- req_sects = end_sect - sector;
- }
bio = next_bio(bio, 0, gfp_mask);
bio->bi_iter.bi_sector = sector;
--
2.11.0
