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Message-Id: <1437118027-94602-5-git-send-email-hare@suse.de>
Date: Fri, 17 Jul 2015 09:27:07 +0200
From: Hannes Reinecke <hare@...e.de>
To: Jens Axboe <axboe@...com>
Cc: Alexander Graf <agraf@...e.com>, Christoph Hellwig <hch@....de>,
linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.de>
Subject: [PATCH 4/4] loop: Pass logical blocksize in 'lo_init[0]' ioctl field
The current LOOP_SET_STATUS64 ioctl has two unused fields
'init[2]', which can be used in conjunction with the
LO_FLAGS_BLOCKSIZE flag to pass in the new logical blocksize.
Signed-off-by: Hannes Reinecke <hare@...e.de>
---
drivers/block/loop.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 321f296..3d2ee0f 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -963,11 +963,21 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
if (err)
return err;
- if (info->lo_flags & LO_FLAGS_BLOCKSIZE)
+ if (info->lo_flags & LO_FLAGS_BLOCKSIZE) {
lo->lo_flags |= LO_FLAGS_BLOCKSIZE;
+ if ((info->lo_init[0] != 512) &&
+ (info->lo_init[0] != 1024) &&
+ (info->lo_init[0] != 2048) &&
+ (info->lo_init[0] != 4096))
+ return -EINVAL;
+ if (info->lo_init[0] > lo->lo_blocksize)
+ return -EINVAL;
+ lo->lo_logical_blocksize = info->lo_init[0];
+ }
if (lo->lo_offset != info->lo_offset ||
- lo->lo_sizelimit != info->lo_sizelimit)
+ lo->lo_sizelimit != info->lo_sizelimit ||
+ lo->lo_flags & LO_FLAGS_BLOCKSIZE)
if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit))
return -EFBIG;
--
1.8.5.2
--
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