X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-context-mnt-ns.c;h=d54c42aa093ae1e2c2a310bc7af09abe69eb3fb3;hb=HEAD;hp=0069e408496ed44235d72ee9f81e3eb82929a179;hpb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;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 0069e408..00000000
--- a/liblttng-ust/lttng-context-mnt-ns.c
+++ /dev/null
@@ -1,126 +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 <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-config.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(struct lttng_ctx_field *field, size_t offset)
-{
-	size_t size = 0;
-
-	size += lib_ring_buffer_align(offset, lttng_alignof(ino_t));
-	size += sizeof(ino_t);
-	return size;
-}
-
-static
-void mnt_ns_record(struct lttng_ctx_field *field,
-		 struct lttng_ust_lib_ring_buffer_ctx *ctx,
-		 struct lttng_channel *chan)
-{
-	ino_t mnt_ns;
-
-	mnt_ns = get_mnt_ns();
-	lib_ring_buffer_align_ctx(ctx, lttng_alignof(mnt_ns));
-	chan->ops->event_write(ctx, &mnt_ns, sizeof(mnt_ns));
-}
-
-static
-void mnt_ns_get_value(struct lttng_ctx_field *field,
-		struct lttng_ctx_value *value)
-{
-	value->u.s64 = get_mnt_ns();
-}
-
-int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
-{
-	struct lttng_ctx_field *field;
-
-	field = lttng_append_context(ctx);
-	if (!field)
-		return -ENOMEM;
-	if (lttng_find_context(*ctx, "mnt_ns")) {
-		lttng_remove_context_field(ctx, field);
-		return -EEXIST;
-	}
-	field->event_field.name = "mnt_ns";
-	field->event_field.type.atype = atype_integer;
-	field->event_field.type.u.integer.size = sizeof(ino_t) * CHAR_BIT;
-	field->event_field.type.u.integer.alignment = lttng_alignof(ino_t) * CHAR_BIT;
-	field->event_field.type.u.integer.signedness = lttng_is_signed_type(ino_t);
-	field->event_field.type.u.integer.reverse_byte_order = 0;
-	field->event_field.type.u.integer.base = 10;
-	field->event_field.type.u.integer.encoding = lttng_encode_none;
-	field->get_size = mnt_ns_get_size;
-	field->record = mnt_ns_record;
-	field->get_value = mnt_ns_get_value;
-	lttng_context_update(*ctx);
-	return 0;
-}