[PATCH v4 32/40] bsd-user: Add os-extattr.h with file and fd extattr functions

Add the first part of extended attribute support: extattrctl,
extattr_set_file, extattr_get_file, extattr_delete_file,
extattr_set_fd, extattr_get_fd, and extattr_delete_fd.

Signed-off-by: Stacey Son <[email protected]>
Assisted-by: Claude Opus 4.6 (1M context)
Acked-by: Richard Henderson <[email protected]>
Signed-off-by: Warner Losh <[email protected]>
---
 bsd-user/freebsd/os-extattr.h | 208 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 208 insertions(+)

diff --git a/bsd-user/freebsd/os-extattr.h b/bsd-user/freebsd/os-extattr.h
new file mode 100644
index 0000000000..fb3ef27346
--- /dev/null
+++ b/bsd-user/freebsd/os-extattr.h
@@ -0,0 +1,208 @@
+/*
+ * FreeBSD extended attributes and ACL system call support
+ *
+ * Copyright (c) 2013 Stacey D. Son
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <sys/extattr.h>
+#include <sys/acl.h>
+
+/* extattrctl() */
+static inline abi_long do_freebsd_extattrctl(abi_ulong arg1, abi_ulong arg2,
+                                             abi_ulong arg3, abi_ulong arg4,
+                                             abi_ulong arg5)
+{
+    abi_long ret;
+    void *p, *a, *f;
+
+    p = lock_user_string(arg1);
+    if (p == NULL) {
+        return -TARGET_EFAULT;
+    }
+    f = lock_user_string(arg3);
+    if (f == NULL) {
+        unlock_user(p, arg1, 0);
+        return -TARGET_EFAULT;
+    }
+    a = lock_user_string(arg5);
+    if (a == NULL) {
+        unlock_user(f, arg3, 0);
+        unlock_user(p, arg1, 0);
+        return -TARGET_EFAULT;
+    }
+    ret = get_errno(extattrctl(path(p), arg2, f, arg4, a));
+    unlock_user(a, arg5, 0);
+    unlock_user(f, arg3, 0);
+    unlock_user(p, arg1, 0);
+
+    return ret;
+}
+
+/* extattr_set_file(2) */
+static inline abi_long do_freebsd_extattr_set_file(abi_long arg1,
+                                                   abi_long arg2,
+                                                   abi_long arg3,
+                                                   abi_long arg4,
+                                                   abi_long arg5)
+{
+    abi_long ret;
+    void *p, *a, *d;
+
+    p = lock_user_string(arg1);
+    if (p == NULL) {
+        return -TARGET_EFAULT;
+    }
+    a = lock_user_string(arg3);
+    if (a == NULL) {
+        unlock_user(p, arg1, 0);
+        return -TARGET_EFAULT;
+    }
+    d = lock_user(VERIFY_READ, arg4, arg5, 1);
+    if (d == NULL) {
+        unlock_user(a, arg3, 0);
+        unlock_user(p, arg1, 0);
+        return -TARGET_EFAULT;
+    }
+    ret = get_errno(extattr_set_file(path(p), arg2, a, d, arg5));
+    unlock_user(d, arg4, arg5);
+    unlock_user(a, arg3, 0);
+    unlock_user(p, arg1, 0);
+
+    return ret;
+}
+
+/* extattr_get_file(2) */
+static inline abi_long do_freebsd_extattr_get_file(abi_long arg1,
+                                                   abi_long arg2,
+                                                   abi_long arg3,
+                                                   abi_long arg4,
+                                                   abi_long arg5)
+{
+    abi_long ret;
+    void *p, *a, *d;
+
+    p = lock_user_string(arg1);
+    if (p == NULL) {
+        return -TARGET_EFAULT;
+    }
+    a = lock_user_string(arg3);
+    if (a == NULL) {
+        unlock_user(p, arg1, 0);
+        return -TARGET_EFAULT;
+    }
+    if (arg4 && arg5 > 0) {
+        d = lock_user(VERIFY_WRITE, arg4, arg5, 0);
+        if (d == NULL) {
+            unlock_user(a, arg3, 0);
+            unlock_user(p, arg1, 0);
+            return -TARGET_EFAULT;
+        }
+        ret = get_errno(extattr_get_file(path(p), arg2, a, d, arg5));
+        unlock_user(d, arg4, arg5);
+    } else {
+        ret = get_errno(extattr_get_file(path(p), arg2, a, NULL, arg5));
+    }
+    unlock_user(a, arg3, 0);
+    unlock_user(p, arg1, 0);
+
+    return ret;
+}
+
+/* extattr_delete_file(2) */
+static inline abi_long do_freebsd_extattr_delete_file(abi_long arg1,
+                                                      abi_long arg2,
+                                                      abi_long arg3)
+{
+    abi_long ret;
+    void *p, *a;
+
+    p = lock_user_string(arg1);
+    if (p == NULL) {
+        return -TARGET_EFAULT;
+    }
+    a = lock_user_string(arg3);
+    if (a == NULL) {
+        unlock_user(p, arg1, 0);
+        return -TARGET_EFAULT;
+    }
+    ret = get_errno(extattr_delete_file(path(p), arg2, a));
+    unlock_user(a, arg3, 0);
+    unlock_user(p, arg1, 0);
+
+    return ret;
+}
+
+/* extattr_set_fd(2) */
+static inline abi_long do_freebsd_extattr_set_fd(abi_long arg1, abi_long arg2,
+                                                 abi_long arg3, abi_long arg4,
+                                                 abi_long arg5)
+{
+    abi_long ret;
+    void *a, *d;
+
+    a = lock_user_string(arg3);
+    if (a == NULL) {
+        return -TARGET_EFAULT;
+    }
+    d = lock_user(VERIFY_READ, arg4, arg5, 1);
+    if (d == NULL) {
+        unlock_user(a, arg3, 0);
+        return -TARGET_EFAULT;
+    }
+    ret = get_errno(extattr_set_fd(arg1, arg2, a, d, arg5));
+    unlock_user(d, arg4, arg5);
+    unlock_user(a, arg3, 0);
+
+    return ret;
+}
+
+/* extattr_get_fd(2) */
+static inline abi_long do_freebsd_extattr_get_fd(abi_long arg1, abi_long arg2,
+                                                 abi_long arg3, abi_long arg4,
+                                                 abi_long arg5)
+{
+    abi_long ret;
+    void *a, *d;
+
+    a = lock_user_string(arg3);
+    if (a == NULL) {
+        return -TARGET_EFAULT;
+    }
+
+    if (arg4 && arg5 > 0) {
+        d = lock_user(VERIFY_WRITE, arg4, arg5, 0);
+        if (d == NULL) {
+            unlock_user(a, arg3, 0);
+            return -TARGET_EFAULT;
+        }
+        ret = get_errno(extattr_get_fd(arg1, arg2, a, d, arg5));
+        unlock_user(d, arg4, arg5);
+    } else {
+        ret = get_errno(extattr_get_fd(arg1, arg2, a, NULL, arg5));
+    }
+    unlock_user(a, arg3, 0);
+
+    return ret;
+}
+
+/* extattr_delete_fd(2) */
+static inline abi_long do_freebsd_extattr_delete_fd(abi_long arg1,
+                                                    abi_long arg2,
+                                                    abi_long arg3)
+{
+    abi_long ret;
+    void *a;
+
+    a = lock_user_string(arg3);
+    if (a == NULL) {
+        return -TARGET_EFAULT;
+    }
+    ret = get_errno(extattr_delete_fd(arg1, arg2, a));
+    unlock_user(a, arg3, 0);
+
+    return ret;
+}
+
+
+#endif /* FREEBSD_OS_EXTATTR_H */

-- 
2.55.0