Messages in this thread Patch in this message | | | From | Andrey Mirkin <> | Subject | [PATCH 4/9] Introduce container dump function | Date | Wed, 3 Sep 2008 14:57:51 +0400 |
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Actually right now we are going to dump only one process. Function for dumping head of image file are added.
Signed-off-by: Andrey Mirkin <major@openvz.org> --- cpt/Makefile | 2 +- cpt/checkpoint.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ cpt/cpt.h | 3 ++ cpt/sys.c | 3 +- kernel/fork.c | 2 + 5 files changed, 82 insertions(+), 2 deletions(-) create mode 100644 cpt/checkpoint.c
diff --git a/cpt/Makefile b/cpt/Makefile index bfe75d5..173346b 100644 --- a/cpt/Makefile +++ b/cpt/Makefile @@ -2,4 +2,4 @@ obj-y += sys_core.o obj-$(CONFIG_CHECKPOINT) += cptrst.o -cptrst-objs := sys.o +cptrst-objs := sys.o checkpoint.o diff --git a/cpt/checkpoint.c b/cpt/checkpoint.c new file mode 100644 index 0000000..b4d9686 --- /dev/null +++ b/cpt/checkpoint.c @@ -0,0 +1,74 @@ +/* + * Copyright (C) 2008 Parallels, Inc. + * + * Author: Andrey Mirkin <major@openvz.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + */ + +#include <linux/sched.h> +#include <linux/fs.h> +#include <linux/file.h> +#include <linux/version.h> + +#include "cpt.h" + +static int cpt_write_head(struct cpt_context *ctx) +{ + struct cpt_head hdr; + + memset(&hdr, 0, sizeof(hdr)); + hdr.cpt_signature[0] = CPT_SIGNATURE0; + hdr.cpt_signature[1] = CPT_SIGNATURE1; + hdr.cpt_signature[2] = CPT_SIGNATURE2; + hdr.cpt_signature[3] = CPT_SIGNATURE3; + hdr.cpt_hdrlen = sizeof(hdr); + hdr.cpt_image_major = (LINUX_VERSION_CODE >> 16) & 0xff; + hdr.cpt_image_minor = (LINUX_VERSION_CODE >> 8) & 0xff; + hdr.cpt_image_sublevel = (LINUX_VERSION_CODE) & 0xff; + hdr.cpt_image_extra = 0; +#if defined(CONFIG_X86_32) + hdr.cpt_arch = CPT_ARCH_I386; +#else +#error Arch is not supported +#endif + return ctx->write(&hdr, sizeof(hdr), ctx); +} + +int dump_container(struct cpt_context *ctx) +{ + int err; + struct task_struct *root; + + read_lock(&tasklist_lock); + root = find_task_by_vpid(ctx->pid); + if (root) + get_task_struct(root); + read_unlock(&tasklist_lock); + + err = -ESRCH; + if (!root) { + eprintk("can not find root task\n"); + return err; + } + ctx->nsproxy = root->nsproxy; + if (!ctx->nsproxy) { + eprintk("nsproxy is null\n"); + goto out; + } + + err = cpt_write_head(ctx); + + /* Dump task here */ + if (!err) + err = -ENOSYS; + +out: + ctx->nsproxy = NULL; + put_task_struct(root); + return err; +} diff --git a/cpt/cpt.h b/cpt/cpt.h index 607ac1b..b421a11 100644 --- a/cpt/cpt.h +++ b/cpt/cpt.h @@ -33,6 +33,7 @@ typedef struct cpt_context int refcount; int ctx_state; struct semaphore main_sem; + struct nsproxy *nsproxy; int errno; @@ -54,3 +55,5 @@ extern int debug_level; #define eprintk(a...) cpt_printk(1, "CPT ERR: " a) #define dprintk(a...) cpt_printk(1, "CPT DBG: " a) + +int dump_container(struct cpt_context *ctx); diff --git a/cpt/sys.c b/cpt/sys.c index 8334c4c..6801c22 100644 --- a/cpt/sys.c +++ b/cpt/sys.c @@ -109,9 +109,10 @@ static int checkpoint(pid_t pid, int fd, unsigned long flags) ctx->file = file; ctx->ctx_state = CPT_CTX_DUMPING; + ctx->pid = pid; /* checkpoint */ - err = -ENOSYS; + err = dump_container(ctx); context_put(ctx); diff --git a/kernel/fork.c b/kernel/fork.c index 52b5037..f38b43d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -77,6 +77,7 @@ int max_threads; /* tunable limit on nr_threads */ DEFINE_PER_CPU(unsigned long, process_counts) = 0; __cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ +EXPORT_SYMBOL(tasklist_lock); int nr_processes(void) { @@ -153,6 +154,7 @@ void __put_task_struct(struct task_struct *tsk) if (!profile_handoff_task(tsk)) free_task(tsk); } +EXPORT_SYMBOL(__put_task_struct); /* * macro override instead of weak attribute alias, to workaround -- 1.5.6
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