diff mbox series

[04/29] md: use bdev_nr_sectors instead of open coding it

Message ID 20211013051042.1065752-5-hch@lst.de (mailing list archive)
State Not Applicable, archived
Delegated to: Mike Snitzer
Headers show
Series [01/29] bcache: remove bdev_sectors | expand

Commit Message

Christoph Hellwig Oct. 13, 2021, 5:10 a.m. UTC 
Use the proper helper to read the block device size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/md/md.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

Comments

Kees Cook Oct. 13, 2021, 6:12 a.m. UTC | #1 
On Wed, Oct 13, 2021 at 07:10:17AM +0200, Christoph Hellwig wrote:
> Use the proper helper to read the block device size.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

I think it might make sense, as you suggest earlier, to add a "bytes"
helper. This is the first user in the series needing:

	bdev_nr_sectors(...bdev) << SECTOR_SHIFT

Reviewed-by: Kees Cook <keescook@chromium.org>
Song Liu Oct. 13, 2021, 9:14 p.m. UTC | #2 
On Tue, Oct 12, 2021 at 11:12 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Wed, Oct 13, 2021 at 07:10:17AM +0200, Christoph Hellwig wrote:
> > Use the proper helper to read the block device size.
> >
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
>
> I think it might make sense, as you suggest earlier, to add a "bytes"
> helper. This is the first user in the series needing:
>
>         bdev_nr_sectors(...bdev) << SECTOR_SHIFT
>
> Reviewed-by: Kees Cook <keescook@chromium.org>

Acked-by: Song Liu <song@kernel.org>

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diff mbox series

Patch

diff --git a/drivers/md/md.c b/drivers/md/md.c
index ec09083ff0eff..9b4f4bf349120 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -890,8 +890,7 @@  static struct md_personality *find_pers(int level, char *clevel)
 /* return the offset of the super block in 512byte sectors */
 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
 {
-	sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
-	return MD_NEW_SIZE_SECTORS(num_sectors);
+	return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev));
 }
 
 static int alloc_disk_sb(struct md_rdev *rdev)
@@ -1633,8 +1632,7 @@  static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
 	 */
 	switch(minor_version) {
 	case 0:
-		sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
-		sb_start -= 8*2;
+		sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2;
 		sb_start &= ~(sector_t)(4*2-1);
 		break;
 	case 1:
@@ -1789,10 +1787,9 @@  static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
 		else
 			ret = 0;
 	}
-	if (minor_version) {
-		sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
-		sectors -= rdev->data_offset;
-	} else
+	if (minor_version)
+		sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
+	else
 		sectors = rdev->sb_start;
 	if (sectors < le64_to_cpu(sb->data_size))
 		return -EINVAL;
@@ -2170,8 +2167,7 @@  super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
 		return 0; /* too confusing */
 	if (rdev->sb_start < rdev->data_offset) {
 		/* minor versions 1 and 2; superblock before data */
-		max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
-		max_sectors -= rdev->data_offset;
+		max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset;
 		if (!num_sectors || num_sectors > max_sectors)
 			num_sectors = max_sectors;
 	} else if (rdev->mddev->bitmap_info.offset) {
@@ -2180,7 +2176,7 @@  super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
 	} else {
 		/* minor version 0; superblock after data */
 		sector_t sb_start, bm_space;
-		sector_t dev_size = i_size_read(rdev->bdev->bd_inode) >> 9;
+		sector_t dev_size = bdev_nr_sectors(rdev->bdev);
 
 		/* 8K is for superblock */
 		sb_start = dev_size - 8*2;
@@ -3384,7 +3380,7 @@  rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
 			if (!sectors)
 				return -EBUSY;
 		} else if (!sectors)
-			sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
+			sectors = bdev_nr_sectors(rdev->bdev) -
 				rdev->data_offset;
 		if (!my_mddev->pers->resize)
 			/* Cannot change size for RAID0 or Linear etc */
@@ -3711,7 +3707,7 @@  static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
 
 	kobject_init(&rdev->kobj, &rdev_ktype);
 
-	size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
+	size = (bdev_nr_sectors(rdev->bdev) << SECTOR_SHIFT) >> BLOCK_SIZE_BITS;
 	if (!size) {
 		pr_warn("md: %s has zero or unknown size, marking faulty!\n",
 			bdevname(rdev->bdev,b));
@@ -6882,7 +6878,7 @@  int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info)
 
 		if (!mddev->persistent) {
 			pr_debug("md: nonpersistent superblock ...\n");
-			rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
+			rdev->sb_start = bdev_nr_sectors(rdev->bdev);
 		} else
 			rdev->sb_start = calc_dev_sboffset(rdev);
 		rdev->sectors = rdev->sb_start;
@@ -6969,7 +6965,7 @@  static int hot_add_disk(struct mddev *mddev, dev_t dev)
 	if (mddev->persistent)
 		rdev->sb_start = calc_dev_sboffset(rdev);
 	else
-		rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
+		rdev->sb_start = bdev_nr_sectors(rdev->bdev);
 
 	rdev->sectors = rdev->sb_start;