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devfs: Add optional truncate callback for device files 

Not all device files have trivial fix device sizes like static
ubi volumes. Here the device file size equals the image size it contains.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Teresa Remmet 2016-11-25 09:06:03 +01:00 committed by Sascha Hauer
parent 0ec6bd3e1b
commit a6785bae3b
2 changed files with 6 additions and 0 deletions
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5
fs/devfs.c
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@ -168,6 +168,11 @@ static int devfs_ioctl(struct device_d *_dev, FILE *f, int request, void *buf)
static int devfs_truncate(struct device_d *dev, FILE *f, ulong size)
{
struct cdev *cdev = f->priv;
if (cdev->ops->truncate)
return cdev->ops->truncate(cdev, size);
if (f->fsdev->dev.num_resources < 1)
return -ENOSPC;
if (size > resource_size(&f->fsdev->dev.resource[0]))

1
include/driver.h
View File

@ -434,6 +434,7 @@ struct file_operations {
int (*erase)(struct cdev*, loff_t count, loff_t offset);
int (*protect)(struct cdev*, size_t count, loff_t offset, int prot);
int (*memmap)(struct cdev*, void **map, int flags);
int (*truncate)(struct cdev*, size_t size);
};
#define MAX_PARTUUID_STR sizeof("00112233-4455-6677-8899-AABBCCDDEEFF")