-#ifndef _LIB_RING_BUFFER_BACKEND_H
-#define _LIB_RING_BUFFER_BACKEND_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 OR LGPL-2.1)
+ *
* lib/ringbuffer/backend.h
*
* Ring buffer backend (API).
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
* Credits to Steven Rostedt for proposing to use an extra-subbuffer owned by
* the reader in flight recorder mode.
*/
+#ifndef _LIB_RING_BUFFER_BACKEND_H
+#define _LIB_RING_BUFFER_BACKEND_H
+
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/mm.h>
-#include <linux/uaccess.h>
+#include <wrapper/uaccess.h>
+#include <probes/lttng-probe-user.h>
/* Internal helpers */
#include <wrapper/ringbuffer/backend_internal.h>
* Only read source character once, in case it is
* modified concurrently.
*/
- c = ACCESS_ONCE(src[count]);
+ c = LTTNG_READ_ONCE(src[count]);
if (!c)
break;
lib_ring_buffer_do_copy(config, &dest[count], &c, 1);
size_t offset = ctx->buf_offset;
struct lib_ring_buffer_backend_pages *backend_pages;
unsigned long ret;
- mm_segment_t old_fs = get_fs();
if (unlikely(!len))
return;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;
pagecpy = min_t(size_t, len, (-offset) & ~PAGE_MASK);
- set_fs(KERNEL_DS);
pagefault_disable();
- if (unlikely(!access_ok(VERIFY_READ, src, len)))
+ if (unlikely(!lttng_access_ok(VERIFY_READ, src, len)))
goto fill_buffer;
if (likely(pagecpy == len)) {
_lib_ring_buffer_copy_from_user_inatomic(bufb, offset, src, len, 0);
}
pagefault_enable();
- set_fs(old_fs);
ctx->buf_offset += len;
return;
fill_buffer:
pagefault_enable();
- set_fs(old_fs);
/*
* In the error path we call the slow path version to avoid
* the pollution of static inline code.
*/
_lib_ring_buffer_memset(bufb, offset, 0, len, 0);
+ ctx->buf_offset += len;
}
/**
size_t index, pagecpy;
size_t offset = ctx->buf_offset;
struct lib_ring_buffer_backend_pages *backend_pages;
- mm_segment_t old_fs = get_fs();
if (unlikely(!len))
return;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;
pagecpy = min_t(size_t, len, (-offset) & ~PAGE_MASK);
- set_fs(KERNEL_DS);
pagefault_disable();
- if (unlikely(!access_ok(VERIFY_READ, src, len)))
+ if (unlikely(!lttng_access_ok(VERIFY_READ, src, len)))
goto fill_buffer;
if (likely(pagecpy == len)) {
len, 0, pad);
}
pagefault_enable();
- set_fs(old_fs);
ctx->buf_offset += len;
return;
fill_buffer:
pagefault_enable();
- set_fs(old_fs);
/*
* In the error path we call the slow path version to avoid
* the pollution of static inline code.
_lib_ring_buffer_memset(bufb, offset, pad, len - 1, 0);
offset += len - 1;
_lib_ring_buffer_memset(bufb, offset, '\0', 1, 0);
+ ctx->buf_offset += len;
}
/*
const void __user *src,
unsigned long len)
{
- unsigned long ret;
- mm_segment_t old_fs;
-
- if (!access_ok(VERIFY_READ, src, len))
- return 1;
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- pagefault_disable();
- ret = __copy_from_user_inatomic(dest, src, len);
- pagefault_enable();
- set_fs(old_fs);
- return ret;
+ return lttng_copy_from_user_check_nofault(dest, src, len);
}
#endif /* _LIB_RING_BUFFER_BACKEND_H */