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path: root/drivers/mtd/ubi/cdev.c
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Diffstat (limited to 'drivers/mtd/ubi/cdev.c')
-rw-r--r--drivers/mtd/ubi/cdev.c184
1 files changed, 133 insertions, 51 deletions
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 98cf31ed081..e63c8fc3df3 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -40,9 +40,9 @@
#include <linux/ioctl.h>
#include <linux/capability.h>
#include <linux/uaccess.h>
-#include <linux/smp_lock.h>
+#include <linux/compat.h>
+#include <linux/math64.h>
#include <mtd/ubi-user.h>
-#include <asm/div64.h>
#include "ubi.h"
/**
@@ -195,7 +195,6 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
int err, lnum, off, len, tbuf_size;
size_t count_save = count;
void *tbuf;
- uint64_t tmp;
dbg_gen("read %zd bytes from offset %lld of volume %d",
count, *offp, vol->vol_id);
@@ -225,10 +224,7 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
return -ENOMEM;
len = count > tbuf_size ? tbuf_size : count;
-
- tmp = *offp;
- off = do_div(tmp, vol->usable_leb_size);
- lnum = tmp;
+ lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
do {
cond_resched();
@@ -263,12 +259,9 @@ static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
return err ? err : count_save - count;
}
-#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
-
/*
* This function allows to directly write to dynamic UBI volumes, without
- * issuing the volume update operation. Available only as a debugging feature.
- * Very useful for testing UBI.
+ * issuing the volume update operation.
*/
static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
size_t count, loff_t *offp)
@@ -279,7 +272,9 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
int lnum, off, len, tbuf_size, err = 0;
size_t count_save = count;
char *tbuf;
- uint64_t tmp;
+
+ if (!vol->direct_writes)
+ return -EPERM;
dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
count, *offp, vol->vol_id);
@@ -287,10 +282,7 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
if (vol->vol_type == UBI_STATIC_VOLUME)
return -EROFS;
- tmp = *offp;
- off = do_div(tmp, vol->usable_leb_size);
- lnum = tmp;
-
+ lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
if (off & (ubi->min_io_size - 1)) {
dbg_err("unaligned position");
return -EINVAL;
@@ -347,10 +339,6 @@ static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
return err ? err : count_save - count;
}
-#else
-#define vol_cdev_direct_write(file, buf, count, offp) (-EPERM)
-#endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */
-
static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
size_t count, loff_t *offp)
{
@@ -402,8 +390,8 @@ static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
return count;
}
-static int vol_cdev_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int err = 0;
struct ubi_volume_desc *desc = file->private_data;
@@ -487,7 +475,6 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
-#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
/* Logical eraseblock erasure command */
case UBI_IOCEBER:
{
@@ -518,13 +505,77 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
err = ubi_wl_flush(ubi);
break;
}
-#endif
+
+ /* Logical eraseblock map command */
+ case UBI_IOCEBMAP:
+ {
+ struct ubi_map_req req;
+
+ err = copy_from_user(&req, argp, sizeof(struct ubi_map_req));
+ if (err) {
+ err = -EFAULT;
+ break;
+ }
+ err = ubi_leb_map(desc, req.lnum, req.dtype);
+ break;
+ }
+
+ /* Logical eraseblock un-map command */
+ case UBI_IOCEBUNMAP:
+ {
+ int32_t lnum;
+
+ err = get_user(lnum, (__user int32_t *)argp);
+ if (err) {
+ err = -EFAULT;
+ break;
+ }
+ err = ubi_leb_unmap(desc, lnum);
+ break;
+ }
+
+ /* Check if logical eraseblock is mapped command */
+ case UBI_IOCEBISMAP:
+ {
+ int32_t lnum;
+
+ err = get_user(lnum, (__user int32_t *)argp);
+ if (err) {
+ err = -EFAULT;
+ break;
+ }
+ err = ubi_is_mapped(desc, lnum);
+ break;
+ }
+
+ /* Set volume property command*/
+ case UBI_IOCSETPROP:
+ {
+ struct ubi_set_prop_req req;
+
+ err = copy_from_user(&req, argp,
+ sizeof(struct ubi_set_prop_req));
+ if (err) {
+ err = -EFAULT;
+ break;
+ }
+ switch (req.property) {
+ case UBI_PROP_DIRECT_WRITE:
+ mutex_lock(&ubi->volumes_mutex);
+ desc->vol->direct_writes = !!req.value;
+ mutex_unlock(&ubi->volumes_mutex);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+ break;
+ }
default:
err = -ENOTTY;
break;
}
-
return err;
}
@@ -762,8 +813,8 @@ out_free:
return err;
}
-static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int err = 0;
struct ubi_device *ubi;
@@ -773,7 +824,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- ubi = ubi_get_by_major(imajor(inode));
+ ubi = ubi_get_by_major(imajor(file->f_mapping->host));
if (!ubi)
return -ENODEV;
@@ -843,7 +894,6 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
case UBI_IOCRSVOL:
{
int pebs;
- uint64_t tmp;
struct ubi_rsvol_req req;
dbg_gen("re-size volume");
@@ -863,9 +913,8 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
- tmp = req.bytes;
- pebs = !!do_div(tmp, desc->vol->usable_leb_size);
- pebs += tmp;
+ pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
+ desc->vol->usable_leb_size);
mutex_lock(&ubi->volumes_mutex);
err = ubi_resize_volume(desc, pebs);
@@ -909,8 +958,8 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
return err;
}
-static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int err = 0;
void __user *argp = (void __user *)arg;
@@ -986,26 +1035,59 @@ static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
return err;
}
-/* UBI control character device operations */
-struct file_operations ubi_ctrl_cdev_operations = {
- .ioctl = ctrl_cdev_ioctl,
- .owner = THIS_MODULE,
+#ifdef CONFIG_COMPAT
+static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+ return vol_cdev_ioctl(file, cmd, translated_arg);
+}
+
+static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+ return ubi_cdev_ioctl(file, cmd, translated_arg);
+}
+
+static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+ return ctrl_cdev_ioctl(file, cmd, translated_arg);
+}
+#else
+#define vol_cdev_compat_ioctl NULL
+#define ubi_cdev_compat_ioctl NULL
+#define ctrl_cdev_compat_ioctl NULL
+#endif
+
+/* UBI volume character device operations */
+const struct file_operations ubi_vol_cdev_operations = {
+ .owner = THIS_MODULE,
+ .open = vol_cdev_open,
+ .release = vol_cdev_release,
+ .llseek = vol_cdev_llseek,
+ .read = vol_cdev_read,
+ .write = vol_cdev_write,
+ .unlocked_ioctl = vol_cdev_ioctl,
+ .compat_ioctl = vol_cdev_compat_ioctl,
};
/* UBI character device operations */
-struct file_operations ubi_cdev_operations = {
- .owner = THIS_MODULE,
- .ioctl = ubi_cdev_ioctl,
- .llseek = no_llseek,
+const struct file_operations ubi_cdev_operations = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .unlocked_ioctl = ubi_cdev_ioctl,
+ .compat_ioctl = ubi_cdev_compat_ioctl,
};
-/* UBI volume character device operations */
-struct file_operations ubi_vol_cdev_operations = {
- .owner = THIS_MODULE,
- .open = vol_cdev_open,
- .release = vol_cdev_release,
- .llseek = vol_cdev_llseek,
- .read = vol_cdev_read,
- .write = vol_cdev_write,
- .ioctl = vol_cdev_ioctl,
+/* UBI control character device operations */
+const struct file_operations ubi_ctrl_cdev_operations = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = ctrl_cdev_ioctl,
+ .compat_ioctl = ctrl_cdev_compat_ioctl,
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 04:36:56 +0000