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| author | Teresa Remmet <t.remmet@phytec.de> | 2016-11-25 09:06:03 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2017-01-11 08:06:48 +0100 |
| commit | a6785bae3b30232c126b2432d2391f89963d100d (patch) | |
| tree | e44e7046ad6766ddc00f66e71dca24614587e6c7 | |
| parent | 0ec6bd3e1be84da991091fab5bbe20f168471a39 (diff) | |
| download | barebox-a6785bae3b30232c126b2432d2391f89963d100d.tar.gz barebox-a6785bae3b30232c126b2432d2391f89963d100d.tar.xz | |
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>
| -rw-r--r-- | fs/devfs.c | 5 | ||||
| -rw-r--r-- | include/driver.h | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/fs/devfs.c b/fs/devfs.c index 6fabcf8ffa..2a7b1b3466 100644 --- a/fs/devfs.c +++ b/fs/devfs.c @@ -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])) diff --git a/include/driver.h b/include/driver.h index 80aa8d821c..6abaaad8b4 100644 --- a/include/driver.h +++ b/include/driver.h @@ -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") |