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use simple_read_from_buffer() in fs/

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Cleanup using simple_read_from_buffer() in binfmt_misc, configfs, and sysfs.

Cc: Greg Kroah-Hartman <[email protected]>
Cc: Joel Becker <[email protected]>
Signed-off-by: Akinobu Mita <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Akinobu Mita 2007-05-09 02:33:32 -07:00 • committed by Linus Torvalds
commit 92f4c701aa
3 changed files with 5 additions and 74 deletions
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33
fs/configfs/file.c
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@ -77,36 +77,6 @@ static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buf
return ret;
}
/**
* flush_read_buffer - push buffer to userspace.
* @buffer: data buffer for file.
* @userbuf: user-passed buffer.
* @count: number of bytes requested.
* @ppos: file position.
*
* Copy the buffer we filled in fill_read_buffer() to userspace.
* This is done at the reader's leisure, copying and advancing
* the amount they specify each time.
* This may be called continuously until the buffer is empty.
*/
static int flush_read_buffer(struct configfs_buffer * buffer, char __user * buf,
size_t count, loff_t * ppos)
{
int error;
if (*ppos > buffer->count)
return 0;
if (count > (buffer->count - *ppos))
count = buffer->count - *ppos;
error = copy_to_user(buf,buffer->page + *ppos,count);
if (!error)
*ppos += count;
return error ? -EFAULT : count;
}
/**
* configfs_read_file - read an attribute.
* @file: file pointer.
@ -139,7 +109,8 @@ configfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *pp
}
pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n",
__FUNCTION__, count, *ppos, buffer->page);
retval = flush_read_buffer(buffer,buf,count,ppos);
retval = simple_read_from_buffer(buf, count, ppos, buffer->page,
buffer->count);
out:
up(&buffer->sem);
return retval;