[11/29] btrfs: use bdev_nr_sectors instead of open coding it

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 <[e-mail]>
---
 fs/btrfs/dev-replace.c | 2 +-
 fs/btrfs/disk-io.c     | 3 ++-
 fs/btrfs/ioctl.c       | 4 ++--
 fs/btrfs/volumes.c     | 7 ++++---
 4 files changed, 9 insertions(+), 7 deletions(-)

Comments

Anand Jain Oct. 13, 2021, 7:08 a.m. UTC | #1

On 13/10/2021 13:10, Christoph Hellwig wrote:
> Use the proper helper to read the block device size.
> 
> Signed-off-by: Christoph Hellwig <[e-mail]>

Looks good.

Reviewed-by: Anand Jain <[e-mail]>

Chaitanya Kulkarni Oct. 13, 2021, 10:36 p.m. UTC | #2

On 10/12/2021 10:10 PM, Christoph Hellwig wrote:
> Use the proper helper to read the block device size.
> 
> Signed-off-by: Christoph Hellwig <[e-mail]>


Looks good.

Reviewed-by: Chaitanya Kulkarni <[e-mail]>

Keith Busch Oct. 14, 2021, 2:44 a.m. UTC | #3

On Wed, Oct 13, 2021 at 07:10:24AM +0200, Christoph Hellwig wrote:
> Use the proper helper to read the block device size.

Just IMO, this patch looks like it wants a new bdev_nr_bytes() helper
instead of using the double shifting sectors back to bytes.

Patch

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index d029be40ea6f0..67799b3132120 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -283,7 +283,7 @@  static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
 	}
 
 
-	if (i_size_read(bdev->bd_inode) <
+	if ((bdev_nr_sectors(bdev) << SECTOR_SHIFT) <
 	    btrfs_device_get_total_bytes(srcdev)) {
 		btrfs_err(fs_info,
 			  "target device is smaller than source device!");
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 355ea88d5c5f7..07983f7e66e9f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3740,7 +3740,8 @@  struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
 	else if (ret)
 		return ERR_PTR(ret);
 
-	if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
+	if (bytenr + BTRFS_SUPER_INFO_SIZE >=
+	    (bdev_nr_sectors(bdev) << SECTOR_SHIFT))
 		return ERR_PTR(-EINVAL);
 
 	page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index cc61813213d83..5e6589b6ad8e4 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1730,7 +1730,7 @@  static noinline int btrfs_ioctl_resize(struct file *file,
 	}
 
 	if (!strcmp(sizestr, "max"))
-		new_size = device->bdev->bd_inode->i_size;
+		new_size = bdev_nr_sectors(device->bdev) << SECTOR_SHIFT;
 	else {
 		if (sizestr[0] == '-') {
 			mod = -1;
@@ -1771,7 +1771,7 @@  static noinline int btrfs_ioctl_resize(struct file *file,
 		ret = -EINVAL;
 		goto out_finish;
 	}
-	if (new_size > device->bdev->bd_inode->i_size) {
+	if (new_size > (bdev_nr_sectors(device->bdev) << SECTOR_SHIFT)) {
 		ret = -EFBIG;
 		goto out_finish;
 	}
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 2ec3b8ac8fa35..11c5f9ec02511 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1286,7 +1286,7 @@  static struct btrfs_super_block *btrfs_read_disk_super(struct block_device *bdev
 	pgoff_t index;
 
 	/* make sure our super fits in the device */
-	if (bytenr + PAGE_SIZE >= i_size_read(bdev->bd_inode))
+	if (bytenr + PAGE_SIZE >= (bdev_nr_sectors(bdev) << SECTOR_SHIFT))
 		return ERR_PTR(-EINVAL);
 
 	/* make sure our super fits in the page */
@@ -2610,7 +2610,7 @@  int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
 	device->io_width = fs_info->sectorsize;
 	device->io_align = fs_info->sectorsize;
 	device->sector_size = fs_info->sectorsize;
-	device->total_bytes = round_down(i_size_read(bdev->bd_inode),
+	device->total_bytes = round_down(bdev_nr_sectors(bdev) << SECTOR_SHIFT,
 					 fs_info->sectorsize);
 	device->disk_total_bytes = device->total_bytes;
 	device->commit_total_bytes = device->total_bytes;
@@ -7236,7 +7236,8 @@  static int read_one_dev(struct extent_buffer *leaf,
 
 	fill_device_from_item(leaf, dev_item, device);
 	if (device->bdev) {
-		u64 max_total_bytes = i_size_read(device->bdev->bd_inode);
+		u64 max_total_bytes =
+			bdev_nr_sectors(device->bdev) << SECTOR_SHIFT;
 
 		if (device->total_bytes > max_total_bytes) {
 			btrfs_err(fs_info,