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authorAkinobu Mita <akinobu.mita@gmail.com>2008-07-25 01:48:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:42 -0700
commitf1a43f93f0f3bab418800eaccb9e2e3b5427e173 (patch)
treed39b73f1de7f16c74f5c304646dbadc728689fa8 /ipc
parent380af1b33b3ff92df5cda96329b58f5d1b6b5a53 (diff)
downloadconfigs-f1a43f93f0f3bab418800eaccb9e2e3b5427e173.tar.gz
ipc: use simple_read_from_buffer()
Also this patch kills unneccesary trailing NULL character. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Nadia Derbey <Nadia.Derbey@bull.net> Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Pierre Peiffer <peifferp@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/mqueue.c25
1 files changed, 7 insertions, 18 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 3e84b958186..1fdc2eb2f6d 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)