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block2mtd: port device access to files

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Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-14-adbd023e19cc@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-01-23 14:26:31 +01:00
parent 3789fb8746
commit f9d8c3c423
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 21 additions and 25 deletions
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46
drivers/mtd/devices/block2mtd.c
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@ -37,7 +37,7 @@
/* Info for the block device */
struct block2mtd_dev {
struct list_head list;
struct bdev_handle *bdev_handle;
struct file *bdev_file;
struct mtd_info mtd;
struct mutex write_mutex;
};
@ -55,8 +55,7 @@ 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->bdev_handle->bdev->bd_inode->i_mapping;
struct address_space *mapping = dev->bdev_file->f_mapping;
struct page *page;
pgoff_t index = to >> PAGE_SHIFT; // page index
int pages = len >> PAGE_SHIFT;
@ -106,8 +105,7 @@ 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 address_space *mapping = dev->bdev_file->f_mapping;
struct page *page;
pgoff_t index = from >> PAGE_SHIFT;
int offset = from & (PAGE_SIZE-1);
@ -142,8 +140,7 @@ 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->bdev_handle->bdev->bd_inode->i_mapping;
struct address_space *mapping = dev->bdev_file->f_mapping;
pgoff_t index = to >> PAGE_SHIFT; // page index
int offset = to & ~PAGE_MASK; // page offset
int cpylen;
@ -198,7 +195,7 @@ 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->bdev_handle->bdev);
sync_blockdev(file_bdev(dev->bdev_file));
return;
}
@ -210,10 +207,9 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
kfree(dev->mtd.name);
if (dev->bdev_handle) {
invalidate_mapping_pages(
dev->bdev_handle->bdev->bd_inode->i_mapping, 0, -1);
bdev_release(dev->bdev_handle);
if (dev->bdev_file) {
invalidate_mapping_pages(dev->bdev_file->f_mapping, 0, -1);
fput(dev->bdev_file);
}
kfree(dev);
@ -223,10 +219,10 @@ 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 bdev_handle __ref *mdtblock_early_get_bdev(const char *devname,
static struct file __ref *mdtblock_early_get_bdev(const char *devname,
blk_mode_t mode, int timeout, struct block2mtd_dev *dev)
{
struct bdev_handle *bdev_handle = ERR_PTR(-ENODEV);
struct file *bdev_file = ERR_PTR(-ENODEV);
#ifndef MODULE
int i;
@ -234,7 +230,7 @@ static struct bdev_handle __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_handle;
return bdev_file;
/*
* We might not have the root device mounted at this point.
@ -253,20 +249,20 @@ static struct bdev_handle __ref *mdtblock_early_get_bdev(const char *devname,
wait_for_device_probe();
if (!early_lookup_bdev(devname, &devt)) {
bdev_handle = bdev_open_by_dev(devt, mode, dev, NULL);
if (!IS_ERR(bdev_handle))
bdev_file = bdev_file_open_by_dev(devt, mode, dev, NULL);
if (!IS_ERR(bdev_file))
break;
}
}
#endif
return bdev_handle;
return bdev_file;
}
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 file *bdev_file;
struct block_device *bdev;
struct block2mtd_dev *dev;
char *name;
@ -279,16 +275,16 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,
return NULL;
/* Get a handle on the device */
bdev_handle = bdev_open_by_path(devname, mode, dev, NULL);
if (IS_ERR(bdev_handle))
bdev_handle = mdtblock_early_get_bdev(devname, mode, timeout,
bdev_file = bdev_file_open_by_path(devname, mode, dev, NULL);
if (IS_ERR(bdev_file))
bdev_file = mdtblock_early_get_bdev(devname, mode, timeout,
dev);
if (IS_ERR(bdev_handle)) {
if (IS_ERR(bdev_file)) {
pr_err("error: cannot open device %s\n", devname);
goto err_free_block2mtd;
}
dev->bdev_handle = bdev_handle;
bdev = bdev_handle->bdev;
dev->bdev_file = bdev_file;
bdev = file_bdev(bdev_file);
if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
pr_err("attempting to use an MTD device as a block device\n");