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From: Teresa Remmet <t.remmet@phytec.de>
To: barebox@lists.infradead.org
Subject: [PATCH 2/6] devfs: Add optional truncate callback for device files
Date: Fri, 25 Nov 2016 09:06:03 +0100	[thread overview]
Message-ID: <1480061167-21590-3-git-send-email-t.remmet@phytec.de> (raw)
In-Reply-To: <1480061167-21590-1-git-send-email-t.remmet@phytec.de>

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>
---
 fs/devfs.c       | 5 +++++
 include/driver.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/fs/devfs.c b/fs/devfs.c
index 6fabcf8..2a7b1b3 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 80aa8d8..6abaaad 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")
-- 
1.9.1


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  parent reply	other threads:[~2016-11-25  8:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-25  8:06 [PATCH 0/6] ubi: remove character device flag from static volumes Teresa Remmet
2016-11-25  8:06 ` [PATCH 1/6] libfile: copy_file: Only open regular files with O_TRUNC Teresa Remmet
2016-11-25  8:06 ` Teresa Remmet [this message]
2016-11-25  8:06 ` [PATCH 3/6] ubi: Add truncate callback Teresa Remmet
2016-11-25  8:06 ` [PATCH 4/6] fs: Remove O_TRUNC check for devices when open files Teresa Remmet
2016-11-25  8:06 ` [PATCH 5/6] commands: ubi: ubiupdatevol: Open device with O_TRUNC Teresa Remmet
2016-11-25  8:06 ` [PATCH 6/6] ubi: barebox: Remove character device flag from static volumes Teresa Remmet
2016-12-07 20:13 ` [PATCH 0/6] ubi: remove " Sascha Hauer

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