mqueue: simplify do_open() error handling
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>
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04db0dde0e
16
ipc/mqueue.c
16
ipc/mqueue.c
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@ -657,24 +657,28 @@ out:
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static struct file *do_open(struct ipc_namespace *ipc_ns,
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struct dentry *dentry, int oflag)
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{
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int ret;
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const struct cred *cred = current_cred();
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static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
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MAY_READ | MAY_WRITE };
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if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
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dput(dentry);
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mntput(ipc_ns->mq_mnt);
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return ERR_PTR(-EINVAL);
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ret = -EINVAL;
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goto err;
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}
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if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) {
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dput(dentry);
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mntput(ipc_ns->mq_mnt);
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return ERR_PTR(-EACCES);
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ret = -EACCES;
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goto err;
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}
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return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
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err:
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dput(dentry);
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mntput(ipc_ns->mq_mnt);
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return ERR_PTR(ret);
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}
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SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,
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