X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-context-mnt-ns.c;h=d54c42aa093ae1e2c2a310bc7af09abe69eb3fb3;hb=HEAD;hp=61812625c2b74b50c9c358c096b15f889fe0560c;hpb=4e48b5d2debaf6c0c598489c183cc6cb2125c8a3;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-context-mnt-ns.c b/liblttng-ust/lttng-context-mnt-ns.c
deleted file mode 100644
index 61812625..00000000
--- a/liblttng-ust/lttng-context-mnt-ns.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
- *
- * LTTng UST mnt namespace context.
- */
-
-#define _LGPL_SOURCE
-#include <limits.h>
-#include <stddef.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <lttng/ust-events.h>
-#include <lttng/ust-tracer.h>
-#include <lttng/ringbuffer-context.h>
-
-#include "context-internal.h"
-#include "ns.h"
-
-/*
- * We cache the result to ensure we don't stat(2) the proc filesystem on
- * each event. The mount namespace is global to the process.
- */
-static ino_t cached_mnt_ns = NS_INO_UNINITIALIZED;
-
-static
-ino_t get_mnt_ns(void)
-{
-	struct stat sb;
-	ino_t mnt_ns;
-
-	mnt_ns = CMM_LOAD_SHARED(cached_mnt_ns);
-
-	/*
-	 * If the cache is populated, do nothing and return the
-	 * cached inode number.
-	 */
-	if (caa_likely(mnt_ns != NS_INO_UNINITIALIZED))
-		return mnt_ns;
-
-	/*
-	 * At this point we have to populate the cache, set the initial
-	 * value to NS_INO_UNAVAILABLE (0), if we fail to get the inode
-	 * number from the proc filesystem, this is the value we will
-	 * cache.
-	 */
-	mnt_ns = NS_INO_UNAVAILABLE;
-
-	if (stat("/proc/self/ns/mnt", &sb) == 0) {
-		mnt_ns = sb.st_ino;
-	}
-
-	/*
-	 * And finally, store the inode number in the cache.
-	 */
-	CMM_STORE_SHARED(cached_mnt_ns, mnt_ns);
-
-	return mnt_ns;
-}
-
-/*
- * The mnt namespace can change for 3 reasons
- *  * clone(2) called with CLONE_NEWNS
- *  * setns(2) called with the fd of a different mnt ns
- *  * unshare(2) called with CLONE_NEWNS
- */
-void lttng_context_mnt_ns_reset(void)
-{
-	CMM_STORE_SHARED(cached_mnt_ns, NS_INO_UNINITIALIZED);
-}
-
-static
-size_t mnt_ns_get_size(void *priv __attribute__((unused)),
-		size_t offset)
-{
-	size_t size = 0;
-
-	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(ino_t));
-	size += sizeof(ino_t);
-	return size;
-}
-
-static
-void mnt_ns_record(void *priv __attribute__((unused)),
-		 struct lttng_ust_lib_ring_buffer_ctx *ctx,
-		 struct lttng_ust_channel_buffer *chan)
-{
-	ino_t mnt_ns;
-
-	mnt_ns = get_mnt_ns();
-	chan->ops->event_write(ctx, &mnt_ns, sizeof(mnt_ns), lttng_ust_rb_alignof(mnt_ns));
-}
-
-static
-void mnt_ns_get_value(void *priv __attribute__((unused)),
-		struct lttng_ust_ctx_value *value)
-{
-	value->u.s64 = get_mnt_ns();
-}
-
-static const struct lttng_ust_ctx_field *ctx_field = lttng_ust_static_ctx_field(
-	lttng_ust_static_event_field("mnt_ns",
-		lttng_ust_static_type_integer(sizeof(ino_t) * CHAR_BIT,
-				lttng_ust_rb_alignof(ino_t) * CHAR_BIT,
-				lttng_ust_is_signed_type(ino_t),
-				BYTE_ORDER, 10),
-		false, false),
-	mnt_ns_get_size,
-	mnt_ns_record,
-	mnt_ns_get_value,
-	NULL, NULL);
-
-int lttng_add_mnt_ns_to_ctx(struct lttng_ust_ctx **ctx)
-{
-	int ret;
-
-	if (lttng_find_context(*ctx, ctx_field->event_field->name)) {
-		ret = -EEXIST;
-		goto error_find_context;
-	}
-	ret = lttng_ust_context_append(ctx, ctx_field);
-	if (ret)
-		return ret;
-	return 0;
-
-error_find_context:
-	return ret;
-}