discover/boot: talloc struct boot_task

Rather than using the stack for struct boot_task, talloc one instead.
This gives us a short-lived context (active for the boot() process
only), and we don't need to use the externally-provided context
directly.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

diff --git a/discover/boot.c b/discover/boot.c
index e57810d54d46a10687c0182d9004d63b0349d188..f9b0223bdf43c42adc30ba439b71ee156eb59a30 100644 (file)
--- a/discover/boot.c
+++ b/discover/boot.c
@@ -53,20 +53,22 @@ static int kexec_load(struct boot_task *boot_task)
        *p++ = "-l";                    /* 2 */
 
        if (boot_task->local_initrd) {
-               s_initrd = talloc_asprintf(NULL, "--initrd=%s",
+               s_initrd = talloc_asprintf(boot_task, "--initrd=%s",
                                boot_task->local_initrd);
                assert(s_initrd);
                *p++ = s_initrd;         /* 3 */
        }
 
        if (boot_task->local_dtb) {
-               s_dtb = talloc_asprintf(NULL, "--dtb=%s", boot_task->local_dtb);
+               s_dtb = talloc_asprintf(boot_task, "--dtb=%s",
+                                               boot_task->local_dtb);
                assert(s_dtb);
                *p++ = s_dtb;            /* 4 */
        }
 
        if (boot_task->args) {
-               s_args = talloc_asprintf(NULL, "--append=%s", boot_task->args);
+               s_args = talloc_asprintf(boot_task, "--append=%s",
+                                               boot_task->args);
                assert(s_args);
                *p++ = s_args;          /* 5 */
        }
@@ -79,10 +81,6 @@ static int kexec_load(struct boot_task *boot_task)
        if (result)
                pb_log("%s: failed: (%d)\n", __func__, result);
 
-       talloc_free(s_initrd);
-       talloc_free(s_dtb);
-       talloc_free(s_args);
-
        return result;
 }
 
@@ -176,8 +174,8 @@ static void boot_hook_update_param(void *ctx, struct boot_task *task,
        }
 }
 
-static void boot_hook_update(void *ctx, const char *hookname,
-               struct boot_task *task, char *buf)
+static void boot_hook_update(struct boot_task *task, const char *hookname,
+               char *buf)
 {
        char *line, *name, *val, *sep;
        char *saveptr;
@@ -196,7 +194,7 @@ static void boot_hook_update(void *ctx, const char *hookname,
                name = line;
                val = sep + 1;
 
-               boot_hook_update_param(ctx, task, name, val);
+               boot_hook_update_param(task, task, name, val);
 
                pb_log("boot hook %s specified %s=%s\n",
                                hookname, name, val);
@@ -229,8 +227,8 @@ static int hook_cmp(const struct dirent **a, const struct dirent **b)
        return strcmp((*a)->d_name, (*b)->d_name);
 }
 
-static void run_boot_hooks(void *ctx, struct boot_task *task,
-               boot_status_fn status_fn, void *status_arg)
+static void run_boot_hooks(struct boot_task *task, boot_status_fn status_fn,
+               void *status_arg)
 {
        struct dirent **hooks;
        int i, n;
@@ -249,7 +247,7 @@ static void run_boot_hooks(void *ctx, struct boot_task *task,
                char *path, *buf;
                int buf_len, rc;
 
-               path = join_paths(ctx, boot_hook_dir, hooks[i]->d_name);
+               path = join_paths(task, boot_hook_dir, hooks[i]->d_name);
 
                if (access(path, X_OK))
                        continue;
@@ -257,14 +255,14 @@ static void run_boot_hooks(void *ctx, struct boot_task *task,
                pb_log("running boot hook %s\n", hooks[i]->d_name);
 
                argv[0] = path;
-               rc = pb_run_cmd_pipe(argv, 1, task->dry_run, ctx,
+               rc = pb_run_cmd_pipe(argv, 1, task->dry_run, task,
                                &buf, &buf_len);
 
                /* if the hook returned with BOOT_HOOK_EXIT_UPDATE,
                 * then we process stdout to look for updated params
                 */
                if (rc == BOOT_HOOK_EXIT_UPDATE) {
-                       boot_hook_update(ctx, hooks[i]->d_name, task, buf);
+                       boot_hook_update(task, hooks[i]->d_name, buf);
                        boot_hook_setenv(task);
                }
 
@@ -278,7 +276,7 @@ static void run_boot_hooks(void *ctx, struct boot_task *task,
 int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                int dry_run, boot_status_fn status_fn, void *status_arg)
 {
-       struct boot_task boot_task;
+       struct boot_task *boot_task;
        struct pb_url *image, *initrd, *dtb;
        unsigned int clean_image = 0;
        unsigned int clean_initrd = 0;
@@ -288,7 +286,6 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
        image = NULL;
        initrd = NULL;
        dtb = NULL;
-       boot_task.dry_run = dry_run;
 
        if (cmd && cmd->boot_image_file) {
                image = pb_url_parse(opt, cmd->boot_image_file);
@@ -299,6 +296,9 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                return -1;
        }
 
+       boot_task = talloc_zero(ctx, struct boot_task);
+       boot_task->dry_run = dry_run;
+
        if (cmd && cmd->initrd_file) {
                initrd = pb_url_parse(opt, cmd->initrd_file);
        } else if (opt && opt->initrd) {
@@ -312,22 +312,20 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
        }
 
        if (cmd && cmd->boot_args) {
-               boot_task.args = talloc_strdup(ctx, cmd->boot_args);
+               boot_task->args = talloc_strdup(boot_task, cmd->boot_args);
        } else if (opt && opt->option->boot_args) {
-               boot_task.args = talloc_strdup(ctx, opt->option->boot_args);
+               boot_task->args = talloc_strdup(boot_task,
+                                               opt->option->boot_args);
        } else {
-               boot_task.args = NULL;
+               boot_task->args = NULL;
        }
 
        result = -1;
 
-       boot_task.local_initrd = NULL;
-       boot_task.local_dtb = NULL;
-
        update_status(status_fn, status_arg, BOOT_STATUS_INFO,
                        "loading kernel");
-       boot_task.local_image = load_url(NULL, image, &clean_image);
-       if (!boot_task.local_image) {
+       boot_task->local_image = load_url(NULL, image, &clean_image);
+       if (!boot_task->local_image) {
                update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
                                "Couldn't load kernel image");
                goto no_load;
@@ -336,8 +334,8 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
        if (initrd) {
                update_status(status_fn, status_arg, BOOT_STATUS_INFO,
                                "loading initrd");
-               boot_task.local_initrd = load_url(NULL, initrd, &clean_initrd);
-               if (!boot_task.local_initrd) {
+               boot_task->local_initrd = load_url(NULL, initrd, &clean_initrd);
+               if (!boot_task->local_initrd) {
                        update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
                                        "Couldn't load initrd image");
                        goto no_load;
@@ -347,20 +345,20 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
        if (dtb) {
                update_status(status_fn, status_arg, BOOT_STATUS_INFO,
                                "loading device tree");
-               boot_task.local_dtb = load_url(NULL, dtb, &clean_dtb);
-               if (!boot_task.local_dtb) {
+               boot_task->local_dtb = load_url(NULL, dtb, &clean_dtb);
+               if (!boot_task->local_dtb) {
                        update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
                                        "Couldn't load device tree");
                        goto no_load;
                }
        }
 
-       run_boot_hooks(ctx, &boot_task, status_fn, status_arg);
+       run_boot_hooks(boot_task, status_fn, status_arg);
 
        update_status(status_fn, status_arg, BOOT_STATUS_INFO,
                        "performing kexec_load");
 
-       result = kexec_load(&boot_task);
+       result = kexec_load(boot_task);
 
        if (result) {
                update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
@@ -369,21 +367,19 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 
 no_load:
        if (clean_image)
-               unlink(boot_task.local_image);
+               unlink(boot_task->local_image);
        if (clean_initrd)
-               unlink(boot_task.local_initrd);
+               unlink(boot_task->local_initrd);
        if (clean_dtb)
-               unlink(boot_task.local_dtb);
+               unlink(boot_task->local_dtb);
 
-       talloc_free(boot_task.local_image);
-       talloc_free(boot_task.local_initrd);
-       talloc_free(boot_task.local_dtb);
+       talloc_free(boot_task);
 
        if (!result) {
                update_status(status_fn, status_arg, BOOT_STATUS_INFO,
                                "performing kexec reboot");
 
-               result = kexec_reboot(boot_task.dry_run);
+               result = kexec_reboot(boot_task->dry_run);
 
                if (result) {
                        update_status(status_fn, status_arg, BOOT_STATUS_ERROR,