[PATCH 05/26] loop: regularize upgrading the lock size for direct I/O
- To: Jens Axboe <axboe@kernel.dk>
- Cc: Geert Uytterhoeven <geert@linux-m68k.org>, Richard Weinberger <richard@nod.at>, Philipp Reisner <philipp.reisner@linbit.com>, Lars Ellenberg <lars.ellenberg@linbit.com>, Christoph Böhmwalder <christoph.boehmwalder@linbit.com>, Josef Bacik <josef@toxicpanda.com>, Ming Lei <ming.lei@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, Roger Pau Monné <roger.pau@citrix.com>, Alasdair Kergon <agk@redhat.com>, Mike Snitzer <snitzer@kernel.org>, Mikulas Patocka <mpatocka@redhat.com>, Song Liu <song@kernel.org>, Yu Kuai <yukuai3@huawei.com>, Vineeth Vijayan <vneethv@linux.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, linux-m68k@lists.linux-m68k.org, linux-um@lists.infradead.org, drbd-dev@lists.linbit.com, nbd@other.debian.org, linuxppc-dev@lists.ozlabs.org, ceph-devel@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, dm-devel@lists.linux.dev, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, nvdimm@lists.linux.dev, linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-block@vger.kernel.org
- Subject: [PATCH 05/26] loop: regularize upgrading the lock size for direct I/O
- From: Christoph Hellwig <hch@lst.de>
- Date: Tue, 11 Jun 2024 07:19:05 +0200
- Message-id: <[🔎] 20240611051929.513387-6-hch@lst.de>
- In-reply-to: <[🔎] 20240611051929.513387-1-hch@lst.de>
- References: <[🔎] 20240611051929.513387-1-hch@lst.de>
The LOOP_CONFIGURE path automatically upgrades the block size to that
of the underlying file for O_DIRECT file descriptors, but the
LOOP_SET_BLOCK_SIZE path does not. Fix this by lifting the code to
pick the block size into common code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/block/loop.c | 25 +++++++++++++++----------
1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index c658282454af1b..4f6d8514d19bd6 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -975,10 +975,24 @@ loop_set_status_from_info(struct loop_device *lo,
return 0;
}
+static unsigned short loop_default_blocksize(struct loop_device *lo,
+ struct block_device *backing_bdev)
+{
+ /* In case of direct I/O, match underlying block size */
+ if ((lo->lo_backing_file->f_flags & O_DIRECT) && backing_bdev)
+ return bdev_logical_block_size(backing_bdev);
+ return 512;
+}
+
static int loop_reconfigure_limits(struct loop_device *lo, unsigned short bsize)
{
+ struct file *file = lo->lo_backing_file;
+ struct inode *inode = file->f_mapping->host;
struct queue_limits lim;
+ if (!bsize)
+ bsize = loop_default_blocksize(lo, inode->i_sb->s_bdev);
+
lim = queue_limits_start_update(lo->lo_queue);
lim.logical_block_size = bsize;
lim.physical_block_size = bsize;
@@ -997,7 +1011,6 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
int error;
loff_t size;
bool partscan;
- unsigned short bsize;
bool is_loop;
if (!file)
@@ -1076,15 +1089,7 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
if (!(lo->lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
blk_queue_write_cache(lo->lo_queue, true, false);
- if (config->block_size)
- bsize = config->block_size;
- else if ((lo->lo_backing_file->f_flags & O_DIRECT) && inode->i_sb->s_bdev)
- /* In case of direct I/O, match underlying block size */
- bsize = bdev_logical_block_size(inode->i_sb->s_bdev);
- else
- bsize = 512;
-
- error = loop_reconfigure_limits(lo, bsize);
+ error = loop_reconfigure_limits(lo, config->block_size);
if (WARN_ON_ONCE(error))
goto out_unlock;
--
2.43.0
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