From f1a43f93f0f3bab418800eaccb9e2e3b5427e173 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Fri, 25 Jul 2008 01:48:07 -0700 Subject: [PATCH] ipc: use simple_read_from_buffer() Also this patch kills unneccesary trailing NULL character. Signed-off-by: Akinobu Mita Cc: Nadia Derbey Cc: Manfred Spraul Cc: Pierre Peiffer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/mqueue.c | 25 +++++++------------------ 1 file changed, 7 insertions(+), 18 deletions(-) diff --git a/ipc/mqueue.c b/ipc/mqueue.c index 3e84b958186b..1fdc2eb2f6d8 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -314,15 +314,11 @@ static int mqueue_unlink(struct inode *dir, struct dentry *dentry) * through std routines) */ static ssize_t mqueue_read_file(struct file *filp, char __user *u_data, - size_t count, loff_t * off) + size_t count, loff_t *off) { struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode); char buffer[FILENT_SIZE]; - size_t slen; - loff_t o; - - if (!count) - return 0; + ssize_t ret; spin_lock(&info->lock); snprintf(buffer, sizeof(buffer), @@ -335,21 +331,14 @@ static ssize_t mqueue_read_file(struct file *filp, char __user *u_data, pid_vnr(info->notify_owner)); spin_unlock(&info->lock); buffer[sizeof(buffer)-1] = '\0'; - slen = strlen(buffer)+1; - - o = *off; - if (o > slen) - return 0; - - if (o + count > slen) - count = slen - o; - if (copy_to_user(u_data, buffer + o, count)) - return -EFAULT; + ret = simple_read_from_buffer(u_data, count, off, buffer, + strlen(buffer)); + if (ret <= 0) + return ret; - *off = o + count; filp->f_path.dentry->d_inode->i_atime = filp->f_path.dentry->d_inode->i_ctime = CURRENT_TIME; - return count; + return ret; } static int mqueue_flush_file(struct file *filp, fl_owner_t id) -- 2.20.1