From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>,
Chandan Babu R <chandanbabu@kernel.org>,
Keith Busch <kbusch@kernel.org>
Cc: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-xfs@vger.kernel.org
Subject: [PATCH 02/10] block: move discard checks into the ioctl handler
Date: Thu, 7 Mar 2024 08:11:49 -0700 [thread overview]
Message-ID: <20240307151157.466013-3-hch@lst.de> (raw)
In-Reply-To: <20240307151157.466013-1-hch@lst.de>
Most bio operations get basic sanity checking in submit_bio and anything
more complicated than that is done in the callers. Discards are a bit
different from that in that a lot of checking is done in
__blkdev_issue_discard, and the specific errnos for that are returned
to userspace. Move the checks that require specific errnos to the ioctl
handler instead, and just leave the basic sanity checking in submit_bio
for the other handlers. This introduces two changes in behavior:
1) the logical block size alignment check of the start and len is lost
for non-ioctl callers.
This matches what is done for other operations including reads and
writes. We should probably verify this for all bios, but for now
make discards match the normal flow.
2) for non-ioctl callers all errors are reported on I/O completion now
instead of synchronously. Callers in general mostly ignore or log
errors so this will actually simplify the code once cleaned up
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-lib.c | 13 -------------
block/ioctl.c | 13 +++++++++----
2 files changed, 9 insertions(+), 17 deletions(-)
diff --git a/block/blk-lib.c b/block/blk-lib.c
index f873eb9a886f63..50923508a32466 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -59,19 +59,6 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, struct bio **biop)
{
struct bio *bio = *biop;
- sector_t bs_mask;
-
- if (bdev_read_only(bdev))
- return -EPERM;
- if (!bdev_max_discard_sectors(bdev))
- return -EOPNOTSUPP;
-
- bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
- if ((sector | nr_sects) & bs_mask)
- return -EINVAL;
-
- if (!nr_sects)
- return -EINVAL;
while (nr_sects) {
sector_t req_sects =
diff --git a/block/ioctl.c b/block/ioctl.c
index de0cc0d215c633..1d5de0a890c5e8 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -95,6 +95,8 @@ static int compat_blkpg_ioctl(struct block_device *bdev,
static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
unsigned long arg)
{
+ sector_t bs_mask = (bdev_logical_block_size(bdev) >> SECTOR_SHIFT) - 1;
+ sector_t sector, nr_sects;
uint64_t range[2];
uint64_t start, len;
struct inode *inode = bdev->bd_inode;
@@ -105,18 +107,21 @@ static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
if (!bdev_max_discard_sectors(bdev))
return -EOPNOTSUPP;
+ if (bdev_read_only(bdev))
+ return -EPERM;
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
return -EFAULT;
start = range[0];
len = range[1];
+ sector = start >> SECTOR_SHIFT;
+ nr_sects = len >> SECTOR_SHIFT;
- if (start & 511)
+ if (!nr_sects)
return -EINVAL;
- if (len & 511)
+ if ((sector | nr_sects) & bs_mask)
return -EINVAL;
-
if (start + len > bdev_nr_bytes(bdev))
return -EINVAL;
@@ -124,7 +129,7 @@ static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
err = truncate_bdev_range(bdev, mode, start, start + len - 1);
if (err)
goto fail;
- err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
+ err = blkdev_issue_discard(bdev, sector, nr_sects, GFP_KERNEL);
fail:
filemap_invalidate_unlock(inode->i_mapping);
return err;
--
2.39.2
next prev parent reply other threads:[~2024-03-07 15:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-07 15:11 RFC: untangle and fix __blkdev_issue_discard Christoph Hellwig
2024-03-07 15:11 ` [PATCH 01/10] block: remove the discard_granularity check in __blkdev_issue_discard Christoph Hellwig
2024-03-07 15:11 ` Christoph Hellwig [this message]
2024-03-07 21:33 ` [PATCH 02/10] block: move discard checks into the ioctl handler Dave Chinner
2024-03-08 15:22 ` Christoph Hellwig
2024-03-08 21:16 ` Dave Chinner
2024-03-07 15:11 ` [PATCH 03/10] block: add a blk_next_discard_bio helper Christoph Hellwig
2024-03-07 15:11 ` [PATCH 04/10] xfs: switch to using blk_next_discard_bio directly Christoph Hellwig
2024-03-07 15:11 ` [PATCH 05/10] f2fs: " Christoph Hellwig
2024-03-07 15:11 ` [PATCH 06/10] ext4: " Christoph Hellwig
2024-03-07 16:13 ` Keith Busch
2024-03-08 15:21 ` Christoph Hellwig
2024-03-07 15:11 ` [PATCH 07/10] nvmet: " Christoph Hellwig
2024-03-07 15:11 ` [PATCH 08/10] md: " Christoph Hellwig
2024-03-07 15:11 ` [PATCH 09/10] dm-thin: " Christoph Hellwig
2024-03-07 15:11 ` [PATCH 10/10] block: remove __blkdev_issue_discard Christoph Hellwig
2024-03-07 21:05 ` RFC: untangle and fix __blkdev_issue_discard Keith Busch
2024-03-08 15:21 ` Christoph Hellwig
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