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c/r: rearrange things to pass struct migrate_opts all the way down

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If we don't do this, we'll end up changing the function signatures for the
internal __criu_* functions each time we add a new parameter, which will
get very annoying very quickly. Since we already have the user's arguments
struct, let's just pass that all the way down.

Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
This commit is contained in:
Tycho Andersen 2016-05-06 18:19:16 +00:00
parent 9504f141c2
commit b2c3710f74
3 changed files with 35 additions and 54 deletions
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77
src/lxc/criu.c
View File

@ -56,20 +56,13 @@ struct criu_opts {
/* The type of criu invocation, one of "dump" or "restore" */ /* The type of criu invocation, one of "dump" or "restore" */
char *action; char *action;
/* The directory to pass to criu */ /* the user-provided migrate options relevant to this action */
char *directory; struct migrate_opts *user;
/* The container to dump */ /* The container to dump */
struct lxc_container *c; struct lxc_container *c;
/* Enable criu verbose mode? */
bool verbose;
/* (pre-)dump: a directory for the previous dump's images */
char *predump_dir;
/* dump: stop the container or not after dumping? */ /* dump: stop the container or not after dumping? */
bool stop;
char tty_id[32]; /* the criu tty id for /dev/console, i.e. "tty[${rdev}:${dev}]" */ char tty_id[32]; /* the criu tty id for /dev/console, i.e. "tty[${rdev}:${dev}]" */
/* restore: the file to write the init process' pid into */ /* restore: the file to write the init process' pid into */
@ -82,10 +75,6 @@ struct criu_opts {
* different) on the target host. NULL if lxc.console = "none". * different) on the target host. NULL if lxc.console = "none".
*/ */
char *console_name; char *console_name;
/* Address and port where a criu pageserver is listening */
char *pageserver_address;
char *pageserver_port;
}; };
static int load_tty_major_minor(char *directory, char *output, int len) static int load_tty_major_minor(char *directory, char *output, int len)
@ -157,15 +146,15 @@ static void exec_criu(struct criu_opts *opts)
static_args += 4; static_args += 4;
/* --prev-images-dir <path-to-directory-A-relative-to-B> */ /* --prev-images-dir <path-to-directory-A-relative-to-B> */
if (opts->predump_dir) if (opts->user->predump_dir)
static_args += 2; static_args += 2;
/* --page-server --address <address> --port <port> */ /* --page-server --address <address> --port <port> */
if (opts->pageserver_address && opts->pageserver_port) if (opts->user->pageserver_address && opts->user->pageserver_port)
static_args += 5; static_args += 5;
/* --leave-running (only for final dump) */ /* --leave-running (only for final dump) */
if (strcmp(opts->action, "dump") == 0 && !opts->stop) if (strcmp(opts->action, "dump") == 0 && !opts->user->stop)
static_args++; static_args++;
/* --external tty[88,4] */ /* --external tty[88,4] */
@ -179,7 +168,7 @@ static void exec_criu(struct criu_opts *opts)
static_args += 10; static_args += 10;
tty_info[0] = 0; tty_info[0] = 0;
if (load_tty_major_minor(opts->directory, tty_info, sizeof(tty_info))) if (load_tty_major_minor(opts->user->directory, tty_info, sizeof(tty_info)))
return; return;
/* --inherit-fd fd[%d]:tty[%s] */ /* --inherit-fd fd[%d]:tty[%s] */
@ -189,10 +178,10 @@ static void exec_criu(struct criu_opts *opts)
return; return;
} }
if (opts->verbose) if (opts->user->verbose)
static_args++; static_args++;
ret = snprintf(log, PATH_MAX, "%s/%s.log", opts->directory, opts->action); ret = snprintf(log, PATH_MAX, "%s/%s.log", opts->user->directory, opts->action);
if (ret < 0 || ret >= PATH_MAX) { if (ret < 0 || ret >= PATH_MAX) {
ERROR("logfile name too long\n"); ERROR("logfile name too long\n");
return; return;
@ -236,11 +225,11 @@ static void exec_criu(struct criu_opts *opts)
DECLARE_ARG("--enable-fs"); DECLARE_ARG("--enable-fs");
DECLARE_ARG("tracefs"); DECLARE_ARG("tracefs");
DECLARE_ARG("-D"); DECLARE_ARG("-D");
DECLARE_ARG(opts->directory); DECLARE_ARG(opts->user->directory);
DECLARE_ARG("-o"); DECLARE_ARG("-o");
DECLARE_ARG(log); DECLARE_ARG(log);
if (opts->verbose) if (opts->user->verbose)
DECLARE_ARG("-vvvvvv"); DECLARE_ARG("-vvvvvv");
if (strcmp(opts->action, "dump") == 0 || strcmp(opts->action, "pre-dump") == 0) { if (strcmp(opts->action, "dump") == 0 || strcmp(opts->action, "pre-dump") == 0) {
@ -275,21 +264,21 @@ static void exec_criu(struct criu_opts *opts)
DECLARE_ARG(opts->tty_id); DECLARE_ARG(opts->tty_id);
} }
if (opts->predump_dir) { if (opts->user->predump_dir) {
DECLARE_ARG("--prev-images-dir"); DECLARE_ARG("--prev-images-dir");
DECLARE_ARG(opts->predump_dir); DECLARE_ARG(opts->user->predump_dir);
} }
if (opts->pageserver_address && opts->pageserver_port) { if (opts->user->pageserver_address && opts->user->pageserver_port) {
DECLARE_ARG("--page-server"); DECLARE_ARG("--page-server");
DECLARE_ARG("--address"); DECLARE_ARG("--address");
DECLARE_ARG(opts->pageserver_address); DECLARE_ARG(opts->user->pageserver_address);
DECLARE_ARG("--port"); DECLARE_ARG("--port");
DECLARE_ARG(opts->pageserver_port); DECLARE_ARG(opts->user->pageserver_port);
} }
/* only for final dump */ /* only for final dump */
if (strcmp(opts->action, "dump") == 0 && !opts->stop) if (strcmp(opts->action, "dump") == 0 && !opts->user->stop)
DECLARE_ARG("--leave-running"); DECLARE_ARG("--leave-running");
} else if (strcmp(opts->action, "restore") == 0) { } else if (strcmp(opts->action, "restore") == 0) {
void *m; void *m;
@ -556,7 +545,7 @@ out_unlock:
// do_restore never returns, the calling process is used as the // do_restore never returns, the calling process is used as the
// monitor process. do_restore calls exit() if it fails. // monitor process. do_restore calls exit() if it fails.
void do_restore(struct lxc_container *c, int status_pipe, char *directory, bool verbose) void do_restore(struct lxc_container *c, int status_pipe, struct migrate_opts *opts)
{ {
pid_t pid; pid_t pid;
char pidfile[L_tmpnam]; char pidfile[L_tmpnam];
@ -642,10 +631,9 @@ void do_restore(struct lxc_container *c, int status_pipe, char *directory, bool
} }
os.action = "restore"; os.action = "restore";
os.directory = directory; os.user = opts;
os.c = c; os.c = c;
os.pidfile = pidfile; os.pidfile = pidfile;
os.verbose = verbose;
os.cgroup_path = cgroup_canonical_path(handler); os.cgroup_path = cgroup_canonical_path(handler);
os.console_fd = c->lxc_conf->console.slave; os.console_fd = c->lxc_conf->console.slave;
@ -829,16 +817,14 @@ static int save_tty_major_minor(char *directory, struct lxc_container *c, char *
} }
/* do one of either predump or a regular dump */ /* do one of either predump or a regular dump */
static bool do_dump(struct lxc_container *c, char *mode, char *directory, static bool do_dump(struct lxc_container *c, char *mode, struct migrate_opts *opts)
bool stop, bool verbose, char *predump_dir,
char *pageserver_address, char *pageserver_port)
{ {
pid_t pid; pid_t pid;
if (!criu_ok(c)) if (!criu_ok(c))
return false; return false;
if (mkdir_p(directory, 0700) < 0) if (mkdir_p(opts->directory, 0700) < 0)
return false; return false;
pid = fork(); pid = fork();
@ -851,16 +837,11 @@ static bool do_dump(struct lxc_container *c, char *mode, char *directory,
struct criu_opts os; struct criu_opts os;
os.action = mode; os.action = mode;
os.directory = directory; os.user = opts;
os.c = c; os.c = c;
os.stop = stop;
os.verbose = verbose;
os.predump_dir = predump_dir;
os.console_name = c->lxc_conf->console.path; os.console_name = c->lxc_conf->console.path;
os.pageserver_address = pageserver_address;
os.pageserver_port = pageserver_port;
if (save_tty_major_minor(directory, c, os.tty_id, sizeof(os.tty_id)) < 0) if (save_tty_major_minor(opts->directory, c, os.tty_id, sizeof(os.tty_id)) < 0)
exit(1); exit(1);
/* exec_criu() returning is an error */ /* exec_criu() returning is an error */
@ -891,17 +872,17 @@ static bool do_dump(struct lxc_container *c, char *mode, char *directory,
} }
} }
bool __criu_pre_dump(struct lxc_container *c, char *directory, bool verbose, char *predump_dir, char *pageserver_address, char *pageserver_port) bool __criu_pre_dump(struct lxc_container *c, struct migrate_opts *opts)
{ {
return do_dump(c, "pre-dump", directory, false, verbose, predump_dir, pageserver_address, pageserver_port); return do_dump(c, "pre-dump", opts);
} }
bool __criu_dump(struct lxc_container *c, char *directory, bool stop, bool verbose, char *predump_dir, char *pageserver_address, char *pageserver_port) bool __criu_dump(struct lxc_container *c, struct migrate_opts *opts)
{ {
char path[PATH_MAX]; char path[PATH_MAX];
int ret; int ret;
ret = snprintf(path, sizeof(path), "%s/inventory.img", directory); ret = snprintf(path, sizeof(path), "%s/inventory.img", opts->directory);
if (ret < 0 || ret >= sizeof(path)) if (ret < 0 || ret >= sizeof(path))
return false; return false;
@ -910,10 +891,10 @@ bool __criu_dump(struct lxc_container *c, char *directory, bool stop, bool verbo
return false; return false;
} }
return do_dump(c, "dump", directory, stop, verbose, predump_dir, pageserver_address, pageserver_port); return do_dump(c, "dump", opts);
} }
bool __criu_restore(struct lxc_container *c, char *directory, bool verbose) bool __criu_restore(struct lxc_container *c, struct migrate_opts *opts)
{ {
pid_t pid; pid_t pid;
int status, nread; int status, nread;
@ -942,7 +923,7 @@ bool __criu_restore(struct lxc_container *c, char *directory, bool verbose)
if (pid == 0) { if (pid == 0) {
close(pipefd[0]); close(pipefd[0]);
// this never returns // this never returns
do_restore(c, pipefd[1], directory, verbose); do_restore(c, pipefd[1], opts);
} }
close(pipefd[1]); close(pipefd[1]);

6
src/lxc/criu.h
View File

@ -27,8 +27,8 @@
#include <lxc/lxccontainer.h> #include <lxc/lxccontainer.h>
bool __criu_pre_dump(struct lxc_container *c, char *directory, bool verbose, char *predump_dir, char *pageserver_address, char *pageserver_port); bool __criu_pre_dump(struct lxc_container *c, struct migrate_opts *opts);
bool __criu_dump(struct lxc_container *c, char *directory, bool stop, bool verbose, char *predump_dir, char *pageserver_address, char *pageserver_port); bool __criu_dump(struct lxc_container *c, struct migrate_opts *opts);
bool __criu_restore(struct lxc_container *c, char *directory, bool verbose); bool __criu_restore(struct lxc_container *c, struct migrate_opts *opts);
#endif #endif

6
src/lxc/lxccontainer.c
View File

@ -3968,13 +3968,13 @@ static int do_lxcapi_migrate(struct lxc_container *c, unsigned int cmd,
switch (cmd) { switch (cmd) {
case MIGRATE_PRE_DUMP: case MIGRATE_PRE_DUMP:
ret = !__criu_pre_dump(c, opts->directory, opts->verbose, opts->predump_dir, opts->pageserver_address, opts->pageserver_port); ret = !__criu_pre_dump(c, opts);
break; break;
case MIGRATE_DUMP: case MIGRATE_DUMP:
ret = !__criu_dump(c, opts->directory, opts->stop, opts->verbose, opts->predump_dir, opts->pageserver_address, opts->pageserver_port); ret = !__criu_dump(c, opts);
break; break;
case MIGRATE_RESTORE: case MIGRATE_RESTORE:
ret = !__criu_restore(c, opts->directory, opts->verbose); ret = !__criu_restore(c, opts);
break; break;
default: default:
ERROR("invalid migrate command %u", cmd); ERROR("invalid migrate command %u", cmd);