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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2008-07-25 10:48:07 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 19:53:42 +0200 |
| commit | f1a43f93f0f3bab418800eaccb9e2e3b5427e173 (patch) | |
| tree | d39b73f1de7f16c74f5c304646dbadc728689fa8 /ipc | |
| parent | ipc/sem.c: rewrite undo list locking (diff) | |
| download | linux-f1a43f93f0f3bab418800eaccb9e2e3b5427e173.tar.xz linux-f1a43f93f0f3bab418800eaccb9e2e3b5427e173.zip | |
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.c | 25 |
1 files 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) |