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authorAl Viro <viro@zeniv.linux.org.uk>2015-12-05 22:04:48 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-23 10:41:31 -0500
commitb25472f9b96159cc0b9b7ed449448805973cd789 (patch)
tree7963f6d5adc2a82f6f10b4f9cf427ce931f67c76 /arch
parentb808b1d632f6915e4d6b1badb927b2c970ad11bb (diff)
downloadlinux-b25472f9b96159cc0b9b7ed449448805973cd789.tar.gz
new helpers: no_seek_end_llseek{,_size}()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc/kernel/mdesc.c20
-rw-r--r--arch/x86/kernel/cpuid.c24
-rw-r--r--arch/x86/kernel/msr.c24
3 files changed, 4 insertions, 64 deletions
diff --git a/arch/sparc/kernel/mdesc.c b/arch/sparc/kernel/mdesc.c
index 6f80936e0eea..11228861d9b4 100644
--- a/arch/sparc/kernel/mdesc.c
+++ b/arch/sparc/kernel/mdesc.c
@@ -1033,25 +1033,9 @@ static ssize_t mdesc_read(struct file *file, char __user *buf,
static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
{
- struct mdesc_handle *hp;
-
- switch (whence) {
- case SEEK_CUR:
- offset += file->f_pos;
- break;
- case SEEK_SET:
- break;
- default:
- return -EINVAL;
- }
-
- hp = file->private_data;
- if (offset > hp->handle_size)
- return -EINVAL;
- else
- file->f_pos = offset;
+ struct mdesc_handle *hp = file->private_data;
- return offset;
+ return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
}
/* mdesc_close() - /dev/mdesc is being closed, release the reference to
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c
index bd3507da39f0..2836de390f95 100644
--- a/arch/x86/kernel/cpuid.c
+++ b/arch/x86/kernel/cpuid.c
@@ -58,28 +58,6 @@ static void cpuid_smp_cpuid(void *cmd_block)
&cmd->eax, &cmd->ebx, &cmd->ecx, &cmd->edx);
}
-static loff_t cpuid_seek(struct file *file, loff_t offset, int orig)
-{
- loff_t ret;
- struct inode *inode = file->f_mapping->host;
-
- mutex_lock(&inode->i_mutex);
- switch (orig) {
- case 0:
- file->f_pos = offset;
- ret = file->f_pos;
- break;
- case 1:
- file->f_pos += offset;
- ret = file->f_pos;
- break;
- default:
- ret = -EINVAL;
- }
- mutex_unlock(&inode->i_mutex);
- return ret;
-}
-
static ssize_t cpuid_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
@@ -132,7 +110,7 @@ static int cpuid_open(struct inode *inode, struct file *file)
*/
static const struct file_operations cpuid_fops = {
.owner = THIS_MODULE,
- .llseek = cpuid_seek,
+ .llseek = no_seek_end_llseek,
.read = cpuid_read,
.open = cpuid_open,
};
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 113e70784854..64f9616f93f1 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -45,28 +45,6 @@
static struct class *msr_class;
-static loff_t msr_seek(struct file *file, loff_t offset, int orig)
-{
- loff_t ret;
- struct inode *inode = file_inode(file);
-
- mutex_lock(&inode->i_mutex);
- switch (orig) {
- case SEEK_SET:
- file->f_pos = offset;
- ret = file->f_pos;
- break;
- case SEEK_CUR:
- file->f_pos += offset;
- ret = file->f_pos;
- break;
- default:
- ret = -EINVAL;
- }
- mutex_unlock(&inode->i_mutex);
- return ret;
-}
-
static ssize_t msr_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
@@ -194,7 +172,7 @@ static int msr_open(struct inode *inode, struct file *file)
*/
static const struct file_operations msr_fops = {
.owner = THIS_MODULE,
- .llseek = msr_seek,
+ .llseek = no_seek_end_llseek,
.read = msr_read,
.write = msr_write,
.open = msr_open,