From: Ilya Dryomov <idryomov@gmail.com>
Date: Thu, 11 Jan 2018 14:09:12 +0100
Subject: [PATCH] block: add bdev_read_only() checks to common helpers
Git-commit: a13553c777375009584741e7d9982e775c4b0744
Patch-mainline: v4.16-rc1
References: bsc#1104967,FATE#325924
Similar to blkdev_write_iter(), return -EPERM if the partition is
read-only. This covers ioctl(), fallocate() and most in-kernel users
but isn't meant to be exhaustive -- everything else will be caught in
generic_make_request_checks(), fail with -EIO and can be fixed later.
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
block/blk-lib.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 2bc544ce3d2e..a676084d4740 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -37,6 +37,9 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
if (!q)
return -ENXIO;
+ if (bdev_read_only(bdev))
+ return -EPERM;
+
if (flags & BLKDEV_DISCARD_SECURE) {
if (!blk_queue_secure_erase(q))
return -EOPNOTSUPP;
@@ -156,6 +159,9 @@ static int __blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
if (!q)
return -ENXIO;
+ if (bdev_read_only(bdev))
+ return -EPERM;
+
bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
if ((sector | nr_sects) & bs_mask)
return -EINVAL;
@@ -233,6 +239,9 @@ static int __blkdev_issue_write_zeroes(struct block_device *bdev,
if (!q)
return -ENXIO;
+ if (bdev_read_only(bdev))
+ return -EPERM;
+
/* Ensure that max_write_zeroes_sectors doesn't overflow bi_size */
max_write_zeroes_sectors = bdev_write_zeroes_sectors(bdev);
@@ -287,6 +296,9 @@ static int __blkdev_issue_zero_pages(struct block_device *bdev,
if (!q)
return -ENXIO;
+ if (bdev_read_only(bdev))
+ return -EPERM;
+
while (nr_sects != 0) {
bio = next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects),
gfp_mask);
--
2.16.4