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mqueue: simplify do_open() error handling

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It reduces code size:
text    data     bss     dec     hex filename
9925      72      16   10013    271d ipc/mqueue-BEFORE.o
9885      72      16    9973    26f5 ipc/mqueue-AFTER.o

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
André Goddard Rosa 2010-02-23 04:04:25 -03:00 committed by Al Viro
parent 8834cf796a
commit 04db0dde0e
1 changed files with 10 additions and 6 deletions
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16
ipc/mqueue.c
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@ -657,24 +657,28 @@ out:
static struct file *do_open(struct ipc_namespace *ipc_ns,
struct dentry *dentry, int oflag)
{
int ret;
const struct cred *cred = current_cred();
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
dput(dentry);
mntput(ipc_ns->mq_mnt);
return ERR_PTR(-EINVAL);
ret = -EINVAL;
goto err;
}
if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) {
dput(dentry);
mntput(ipc_ns->mq_mnt);
return ERR_PTR(-EACCES);
ret = -EACCES;
goto err;
}
return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
err:
dput(dentry);
mntput(ipc_ns->mq_mnt);
return ERR_PTR(ret);
}
SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,