提交 0c28f287 编写于 作者: A Akinobu Mita 提交者: Linus Torvalds

procfs: use simple_read_from_buffer()

Cleanup using simple_read_from_buffer() in procfs.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 34633993
......@@ -660,7 +660,6 @@ static ssize_t oom_adjust_read(struct file *file, char __user *buf,
char buffer[PROC_NUMBUF];
size_t len;
int oom_adjust;
loff_t __ppos = *ppos;
if (!task)
return -ESRCH;
......@@ -668,14 +667,8 @@ static ssize_t oom_adjust_read(struct file *file, char __user *buf,
put_task_struct(task);
len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
if (__ppos >= len)
return 0;
if (count > len-__ppos)
count = len-__ppos;
if (copy_to_user(buf, buffer + __ppos, count))
return -EFAULT;
*ppos = __ppos + count;
return count;
return simple_read_from_buffer(buf, count, ppos, buffer, len);
}
static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
......@@ -823,7 +816,6 @@ static ssize_t seccomp_read(struct file *file, char __user *buf,
{
struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode);
char __buf[20];
loff_t __ppos = *ppos;
size_t len;
if (!tsk)
......@@ -831,14 +823,8 @@ static ssize_t seccomp_read(struct file *file, char __user *buf,
/* no need to print the trailing zero, so use only len */
len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
put_task_struct(tsk);
if (__ppos >= len)
return 0;
if (count > len - __ppos)
count = len - __ppos;
if (copy_to_user(buf, __buf + __ppos, count))
return -EFAULT;
*ppos = __ppos + count;
return count;
return simple_read_from_buffer(buf, count, ppos, __buf, len);
}
static ssize_t seccomp_write(struct file *file, const char __user *buf,
......@@ -897,7 +883,6 @@ static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
char buffer[PROC_NUMBUF];
size_t len;
int make_it_fail;
loff_t __ppos = *ppos;
if (!task)
return -ESRCH;
......@@ -905,14 +890,8 @@ static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
put_task_struct(task);
len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
if (__ppos >= len)
return 0;
if (count > len-__ppos)
count = len-__ppos;
if (copy_to_user(buf, buffer + __ppos, count))
return -EFAULT;
*ppos = __ppos + count;
return count;
return simple_read_from_buffer(buf, count, ppos, buffer, len);
}
static ssize_t proc_fault_inject_write(struct file * file,
......@@ -975,7 +954,7 @@ static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
if (!tmp)
return -ENOMEM;
inode = dentry->d_inode;
path = d_path(dentry, mnt, tmp, PAGE_SIZE);
len = PTR_ERR(path);
......
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