This is a note to let you know that I've just added the patch titled
nbd: use loff_t for blocksize and nbd_set_size args
to the 4.9-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:
nbd-use-loff_t-for-blocksize-and-nbd_set_size-args.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ef77b515243b3499d62cf446eda6ca7e0a0b079c Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@xxxxxx>
Date: Fri, 2 Dec 2016 16:19:12 -0500
Subject: nbd: use loff_t for blocksize and nbd_set_size args
From: Josef Bacik <jbacik@xxxxxx>
commit ef77b515243b3499d62cf446eda6ca7e0a0b079c upstream.
If we have large devices (say like the 40t drive I was trying to test with) we
will end up overflowing the int arguments to nbd_set_size and not get the right
size for our device. Fix this by using loff_t everywhere so I don't have to
think about this again. Thanks,
Signed-off-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/nbd.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -54,7 +54,7 @@ struct nbd_device {
struct mutex tx_lock;
struct gendisk *disk;
- int blksize;
+ loff_t blksize;
loff_t bytesize;
/* protects initialization and shutdown of the socket */
@@ -126,7 +126,7 @@ static void nbd_size_update(struct nbd_d
}
static int nbd_size_set(struct nbd_device *nbd, struct block_device *bdev,
- int blocksize, int nr_blocks)
+ loff_t blocksize, loff_t nr_blocks)
{
int ret;
@@ -135,7 +135,7 @@ static int nbd_size_set(struct nbd_devic
return ret;
nbd->blksize = blocksize;
- nbd->bytesize = (loff_t)blocksize * (loff_t)nr_blocks;
+ nbd->bytesize = blocksize * nr_blocks;
nbd_size_update(nbd, bdev);
@@ -817,7 +817,7 @@ static int nbd_dev_dbg_init(struct nbd_d
debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops);
debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize);
debugfs_create_u32("timeout", 0444, dir, &nbd->tag_set.timeout);
- debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize);
+ debugfs_create_u64("blocksize", 0444, dir, &nbd->blksize);
debugfs_create_file("flags", 0444, dir, nbd, &nbd_dbg_flags_ops);
return 0;
Patches currently in stable-queue which might be from jbacik@xxxxxx are
queue-4.9/nbd-use-loff_t-for-blocksize-and-nbd_set_size-args.patch