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2dccf128 MD |
1 | /* |
2 | * ltt-context.c | |
3 | * | |
4 | * Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * LTTng trace/channel/event context management. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/mutex.h> | |
12 | #include <linux/slab.h> | |
13 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ | |
14 | #include "ltt-events.h" | |
15 | #include "ltt-tracer.h" | |
16 | ||
17 | struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p) | |
18 | { | |
19 | struct lttng_ctx_field *field; | |
20 | struct lttng_ctx *ctx; | |
21 | ||
22 | if (!*ctx_p) { | |
23 | *ctx_p = kzalloc(sizeof(struct lttng_ctx), GFP_KERNEL); | |
24 | if (!*ctx_p) | |
25 | return NULL; | |
26 | } | |
27 | ctx = *ctx_p; | |
28 | if (ctx->nr_fields + 1 > ctx->allocated_fields) { | |
29 | struct lttng_ctx_field *new_fields; | |
30 | ||
31 | ctx->allocated_fields = min_t(size_t, 1, 2 * ctx->allocated_fields); | |
32 | new_fields = kzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL); | |
33 | if (!new_fields) | |
34 | return NULL; | |
35 | if (ctx->fields) | |
36 | memcpy(new_fields, ctx->fields, ctx->nr_fields); | |
37 | kfree(ctx->fields); | |
38 | ctx->fields = new_fields; | |
39 | } | |
40 | field = &ctx->fields[ctx->nr_fields]; | |
41 | ctx->nr_fields++; | |
42 | return field; | |
43 | } | |
44 | EXPORT_SYMBOL_GPL(lttng_append_context); | |
45 | ||
46 | void lttng_destroy_context(struct lttng_ctx *ctx) | |
47 | { | |
48 | int i; | |
49 | ||
8070f5c0 MD |
50 | if (!ctx) |
51 | return; | |
9e7e4892 MD |
52 | for (i = 0; i < ctx->nr_fields; i++) { |
53 | if (ctx->fields[i].destroy) | |
54 | ctx->fields[i].destroy(&ctx->fields[i]); | |
55 | } | |
2dccf128 MD |
56 | kfree(ctx->fields); |
57 | kfree(ctx); | |
58 | } |