[PATCH 12/29] mtd: block2mtd: Convert to bdev_open_by_dev/path()

Jan Kara
2023-09-27T09:35:18Z

Convert block2mtd to use bdev_open_by_dev() and bdev_open_by_path() and
pass the handle around.

CC: Joern Engel <joern@lazybastard.org>
CC: linux-mtd@lists.infradead.org
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
drivers/mtd/devices/block2mtd.c | 51 +++++++++++++++++++--------------
1 file changed, 29 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index be106dc20ff3..aa44a23ec045 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -37,7 +37,7 @@
/* Info for the block device */
struct block2mtd_dev {
struct list_head list;
- struct block_device *blkdev;
+ struct bdev_handle *bdev_handle;
struct mtd_info mtd;
struct mutex write_mutex;
};
@@ -55,7 +55,8 @@ static struct page *page_read(struct address_space *mapping, pgoff_t index)
/* erase a specified part of the device */
static int _block2mtd_erase(struct block2mtd_dev *dev, loff_t to, size_t len)
{
- struct address_space *mapping = dev->blkdev->bd_inode->i_mapping;
+ struct address_space *mapping =
+ dev->bdev_handle->bdev->bd_inode->i_mapping;
struct page *page;
pgoff_t index = to >> PAGE_SHIFT; // page index
int pages = len >> PAGE_SHIFT;
@@ -105,6 +106,8 @@ static int block2mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct block2mtd_dev *dev = mtd->priv;
+ struct address_space *mapping =
+ dev->bdev_handle->bdev->bd_inode->i_mapping;
struct page *page;
pgoff_t index = from >> PAGE_SHIFT;
int offset = from & (PAGE_SIZE-1);
@@ -117,7 +120,7 @@ static int block2mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
cpylen = len; // this page
len = len - cpylen;

- page = page_read(dev->blkdev->bd_inode->i_mapping, index);
+ page = page_read(mapping, index);
if (IS_ERR(page))
return PTR_ERR(page);

@@ -139,7 +142,8 @@ static int _block2mtd_write(struct block2mtd_dev *dev, const u_char *buf,
loff_t to, size_t len, size_t *retlen)
{
struct page *page;
- struct address_space *mapping = dev->blkdev->bd_inode->i_mapping;
+ struct address_space *mapping =
+ dev->bdev_handle->bdev->bd_inode->i_mapping;
pgoff_t index = to >> PAGE_SHIFT; // page index
int offset = to & ~PAGE_MASK; // page offset
int cpylen;
@@ -194,7 +198,7 @@ static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
static void block2mtd_sync(struct mtd_info *mtd)
{
struct block2mtd_dev *dev = mtd->priv;
- sync_blockdev(dev->blkdev);
+ sync_blockdev(dev->bdev_handle->bdev);
return;
}

@@ -206,10 +210,10 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)

kfree(dev->mtd.name);

- if (dev->blkdev) {
- invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
- 0, -1);
- blkdev_put(dev->blkdev, NULL);
+ if (dev->bdev_handle) {
+ invalidate_mapping_pages(
+ dev->bdev_handle->bdev->bd_inode->i_mapping, 0, -1);
+ bdev_release(dev->bdev_handle);
}

kfree(dev);
@@ -219,10 +223,10 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
* This function is marked __ref because it calls the __init marked
* early_lookup_bdev when called from the early boot code.
*/
-static struct block_device __ref *mdtblock_early_get_bdev(const char *devname,
+static struct bdev_handle __ref *mdtblock_early_get_bdev(const char *devname,
blk_mode_t mode, int timeout, struct block2mtd_dev *dev)
{
- struct block_device *bdev = ERR_PTR(-ENODEV);
+ struct bdev_handle *bdev_handle = ERR_PTR(-ENODEV);
#ifndef MODULE
int i;

@@ -230,7 +234,7 @@ static struct block_device __ref *mdtblock_early_get_bdev(const char *devname,
* We can't use early_lookup_bdev from a running system.
*/
if (system_state >= SYSTEM_RUNNING)
- return bdev;
+ return bdev_handle;

/*
* We might not have the root device mounted at this point.
@@ -249,19 +253,20 @@ static struct block_device __ref *mdtblock_early_get_bdev(const char *devname,
wait_for_device_probe();

if (!early_lookup_bdev(devname, &devt)) {
- bdev = blkdev_get_by_dev(devt, mode, dev, NULL);
- if (!IS_ERR(bdev))
+ bdev_handle = bdev_open_by_dev(devt, mode, dev, NULL);
+ if (!IS_ERR(bdev_handle))
break;
}
}
#endif
- return bdev;
+ return bdev_handle;
}

static struct block2mtd_dev *add_device(char *devname, int erase_size,
char *label, int timeout)
{
const blk_mode_t mode = BLK_OPEN_READ | BLK_OPEN_WRITE;
+ struct bdev_handle *bdev_handle;
struct block_device *bdev;
struct block2mtd_dev *dev;
char *name;
@@ -274,21 +279,23 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,
return NULL;

/* Get a handle on the device */
- bdev = blkdev_get_by_path(devname, mode, dev, NULL);
- if (IS_ERR(bdev))
- bdev = mdtblock_early_get_bdev(devname, mode, timeout, dev);
- if (IS_ERR(bdev)) {
+ bdev_handle = bdev_open_by_path(devname, mode, dev, NULL);
+ if (IS_ERR(bdev_handle))
+ bdev_handle = mdtblock_early_get_bdev(devname, mode, timeout,
+ dev);
+ if (IS_ERR(bdev_handle)) {
pr_err("error: cannot open device %s\n", devname);
goto err_free_block2mtd;
}
- dev->blkdev = bdev;
+ dev->bdev_handle = bdev_handle;
+ bdev = bdev_handle->bdev;

if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
pr_err("attempting to use an MTD device as a block device\n");
goto err_free_block2mtd;
}

- if ((long)dev->blkdev->bd_inode->i_size % erase_size) {
+ if ((long)bdev->bd_inode->i_size % erase_size) {
pr_err("erasesize must be a divisor of device size\n");
goto err_free_block2mtd;
}
@@ -306,7 +313,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,

dev->mtd.name = name;

- dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
+ dev->mtd.size = bdev->bd_inode->i_size & PAGE_MASK;
dev->mtd.erasesize = erase_size;
dev->mtd.writesize = 1;
dev->mtd.writebufsize = PAGE_SIZE;
--
2.35.3