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    SubjectRe: [PATCH 5/9] Restore memory address space
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    Date
    On Thu, 2008-10-16 at 11:14 -0700, Dave Hansen wrote:
    > From: Oren Laadan <orenl@cs.columbia.edu>
    >
    > Restoring the memory address space begins with nuking the existing one
    > of the current process, and then reading the VMA state and contents.
    > Call do_mmap_pgoffset() for each VMA and then read in the data.
    >
    > Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
    > Acked-by: Serge Hallyn <serue@us.ibm.com>
    > Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
    > ---
    >
    > linux-2.6.git-dave/arch/x86/mm/restart.c | 64 +++
    > linux-2.6.git-dave/checkpoint/Makefile | 2
    > linux-2.6.git-dave/checkpoint/checkpoint_arch.h | 2
    > linux-2.6.git-dave/checkpoint/checkpoint_mem.h | 5
    > linux-2.6.git-dave/checkpoint/restart.c | 42 ++
    > linux-2.6.git-dave/checkpoint/rstr_mem.c | 384 ++++++++++++++++++++
    > linux-2.6.git-dave/include/asm-x86/checkpoint_hdr.h | 4
    > linux-2.6.git-dave/include/linux/checkpoint.h | 3
    > 8 files changed, 503 insertions(+), 3 deletions(-)
    >
    > diff -puN arch/x86/mm/restart.c~v6_PATCH_5_9_Restore_memory_address_space arch/x86/mm/restart.c
    > --- linux-2.6.git/arch/x86/mm/restart.c~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/arch/x86/mm/restart.c 2008-10-16 10:53:36.000000000 -0700
    > @@ -53,8 +53,10 @@ int cr_read_thread(struct cr_ctx *ctx)
    >
    > size = sizeof(*desc) * GDT_ENTRY_TLS_ENTRIES;
    > desc = kmalloc(size, GFP_KERNEL);
    > - if (!desc)
    > - return -ENOMEM;
    > + if (!desc) {
    > + ret = -ENOMEM;
    > + goto out;
    > + }
    >
    > ret = cr_kread(ctx, desc, size);
    > if (ret >= 0) {
    > @@ -189,3 +191,61 @@ int cr_read_cpu(struct cr_ctx *ctx)
    > cr_hbuf_put(ctx, sizeof(*hh));
    > return ret;
    > }
    > +
    > +int cr_read_mm_context(struct cr_ctx *ctx, struct mm_struct *mm, int parent)
    > +{
    > + struct cr_hdr_mm_context *hh = cr_hbuf_get(ctx, sizeof(*hh));
    > + int n, rparent, ret = -EINVAL;
    > +
    > + rparent = cr_read_obj_type(ctx, hh, sizeof(*hh), CR_HDR_MM_CONTEXT);
    > + cr_debug("parent %d rparent %d nldt %d\n", parent, rparent, hh->nldt);
    > + if (rparent < 0) {
    > + ret = rparent;
    > + goto out;
    > + }
    > + if (rparent != parent)
    > + goto out;
    > +
    > + if (hh->nldt < 0 || hh->ldt_entry_size != LDT_ENTRY_SIZE)
    > + goto out;
    > +
    > + /*
    > + * to utilize the syscall modify_ldt() we first convert the data
    > + * in the checkpoint image from 'struct desc_struct' to 'struct
    > + * user_desc' with reverse logic of include/asm/desc.h:fill_ldt()
    > + */
    > +
    > + for (n = 0; n < hh->nldt; n++) {
    > + struct user_desc info;
    > + struct desc_struct desc;
    > + mm_segment_t old_fs;
    > +
    > + ret = cr_kread(ctx, &desc, LDT_ENTRY_SIZE);
    > + if (ret < 0)
    > + goto out;
    > +
    > + info.entry_number = n;
    > + info.base_addr = desc.base0 | (desc.base1 << 16);
    > + info.limit = desc.limit0;
    > + info.seg_32bit = desc.d;
    > + info.contents = desc.type >> 2;
    > + info.read_exec_only = (desc.type >> 1) ^ 1;
    > + info.limit_in_pages = desc.g;
    > + info.seg_not_present = desc.p ^ 1;
    > + info.useable = desc.avl;
    > +
    > + old_fs = get_fs();
    > + set_fs(get_ds());
    > + ret = sys_modify_ldt(1, (struct user_desc __user *) &info,
    > + sizeof(info));
    > + set_fs(old_fs);
    > +
    > + if (ret < 0)
    > + goto out;
    > + }
    > +
    > + ret = 0;
    > + out:
    > + cr_hbuf_put(ctx, sizeof(*hh));
    > + return ret;
    > +}
    > diff -puN checkpoint/checkpoint_arch.h~v6_PATCH_5_9_Restore_memory_address_space checkpoint/checkpoint_arch.h
    > --- linux-2.6.git/checkpoint/checkpoint_arch.h~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/checkpoint/checkpoint_arch.h 2008-10-16 10:53:36.000000000 -0700
    > @@ -7,3 +7,5 @@ extern int cr_write_mm_context(struct cr
    >
    > extern int cr_read_thread(struct cr_ctx *ctx);
    > extern int cr_read_cpu(struct cr_ctx *ctx);
    > +extern int cr_read_mm_context(struct cr_ctx *ctx,
    > + struct mm_struct *mm, int parent);
    > diff -puN checkpoint/checkpoint_mem.h~v6_PATCH_5_9_Restore_memory_address_space checkpoint/checkpoint_mem.h
    > --- linux-2.6.git/checkpoint/checkpoint_mem.h~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/checkpoint/checkpoint_mem.h 2008-10-16 10:53:36.000000000 -0700
    > @@ -38,4 +38,9 @@ static inline int cr_pgarr_is_full(struc
    > return (pgarr->nr_used == CR_PGARR_TOTAL);
    > }
    >
    > +static inline int cr_pgarr_nr_free(struct cr_pgarr *pgarr)
    > +{
    > + return CR_PGARR_TOTAL - pgarr->nr_used;
    > +}
    > +
    > #endif /* _CHECKPOINT_CKPT_MEM_H_ */
    > diff -puN checkpoint/Makefile~v6_PATCH_5_9_Restore_memory_address_space checkpoint/Makefile
    > --- linux-2.6.git/checkpoint/Makefile~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/checkpoint/Makefile 2008-10-16 10:53:36.000000000 -0700
    > @@ -3,4 +3,4 @@
    > #
    >
    > obj-$(CONFIG_CHECKPOINT_RESTART) += sys.o checkpoint.o restart.o \
    > - ckpt_mem.o
    > + ckpt_mem.o rstr_mem.o
    > diff -puN checkpoint/restart.c~v6_PATCH_5_9_Restore_memory_address_space checkpoint/restart.c
    > --- linux-2.6.git/checkpoint/restart.c~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/checkpoint/restart.c 2008-10-16 10:53:36.000000000 -0700
    > @@ -78,6 +78,44 @@ int cr_read_string(struct cr_ctx *ctx, v
    > return cr_read_obj_type(ctx, str, len, CR_HDR_STRING);
    > }
    >
    > +/**
    > + * cr_read_fname - read a file name
    > + * @ctx: checkpoint context
    > + * @fname: buffer
    > + * @n: buffer length
    > + */
    > +int cr_read_fname(struct cr_ctx *ctx, void *fname, int flen)
    > +{
    > + return cr_read_obj_type(ctx, fname, flen, CR_HDR_FNAME);
    > +}
    > +
    > +/**
    > + * cr_read_open_fname - read a file name and open a file
    > + * @ctx: checkpoint context
    > + * @flags: file flags
    > + * @mode: file mode
    > + */
    > +struct file *cr_read_open_fname(struct cr_ctx *ctx, int flags, int mode)
    > +{
    > + struct file *file;
    > + char *fname;
    > + int ret;
    > +
    > + fname = kmalloc(PATH_MAX, GFP_KERNEL);
    > + if (!fname)
    > + return ERR_PTR(-ENOMEM);
    > +
    > + ret = cr_read_fname(ctx, fname, PATH_MAX);
    > + cr_debug("fname '%s' flags %#x mode %#x\n", fname, flags, mode);
    > + if (ret >= 0)
    > + file = filp_open(fname, flags, mode);
    > + else
    > + file = ERR_PTR(ret);
    > +
    > + kfree(fname);
    > + return file;
    > +}
    > +
    > /* read the checkpoint header */
    > static int cr_read_head(struct cr_ctx *ctx)
    > {
    > @@ -177,6 +215,10 @@ static int cr_read_task(struct cr_ctx *c
    > cr_debug("task_struct: ret %d\n", ret);
    > if (ret < 0)
    > goto out;
    > + ret = cr_read_mm(ctx);
    > + cr_debug("memory: ret %d\n", ret);
    > + if (ret < 0)
    > + goto out;
    > ret = cr_read_thread(ctx);
    > cr_debug("thread: ret %d\n", ret);
    > if (ret < 0)
    > diff -puN /dev/null checkpoint/rstr_mem.c
    > --- /dev/null 2008-09-02 09:40:19.000000000 -0700
    > +++ linux-2.6.git-dave/checkpoint/rstr_mem.c 2008-10-16 10:53:36.000000000 -0700
    > @@ -0,0 +1,384 @@
    > +/*
    > + * Restart memory contents
    > + *
    > + * Copyright (C) 2008 Oren Laadan
    > + *
    > + * This file is subject to the terms and conditions of the GNU General Public
    > + * License. See the file COPYING in the main directory of the Linux
    > + * distribution for more details.
    > + */
    > +
    > +#include <linux/kernel.h>
    > +#include <linux/sched.h>
    > +#include <linux/fcntl.h>
    > +#include <linux/file.h>
    > +#include <linux/fs.h>
    > +#include <linux/pagemap.h>
    > +#include <linux/mm_types.h>
    > +#include <linux/mman.h>
    > +#include <linux/mm.h>
    > +#include <linux/err.h>
    > +#include <linux/checkpoint.h>
    > +#include <linux/checkpoint_hdr.h>
    > +
    > +#include "checkpoint_arch.h"
    > +#include "checkpoint_mem.h"
    > +
    > +/*
    > + * Unlike checkpoint, restart is executed in the context of each restarting
    > + * process: vma regions are restored via a call to mmap(), and the data is
    > + * read into the address space of the current process.
    > + */
    > +
    > +
    > +/**
    > + * cr_read_pages_vaddrs - read addresses of pages to page-array chain
    > + * @ctx - restart context
    > + * @nr_pages - number of address to read
    > + */
    > +static int cr_read_pages_vaddrs(struct cr_ctx *ctx, unsigned long nr_pages)
    > +{
    > + struct cr_pgarr *pgarr;
    > + unsigned long *vaddrp;
    > + int nr, ret;
    > +
    > + while (nr_pages) {
    > + pgarr = cr_pgarr_current(ctx);
    > + if (!pgarr)
    > + return -ENOMEM;
    > + nr = cr_pgarr_nr_free(pgarr);
    > + if (nr > nr_pages)
    > + nr = nr_pages;
    > + vaddrp = &pgarr->vaddrs[pgarr->nr_used];
    > + ret = cr_kread(ctx, vaddrp, nr * sizeof(unsigned long));
    > + if (ret < 0)
    > + return ret;
    > + pgarr->nr_used += nr;
    > + nr_pages -= nr;
    > + }
    > + return 0;
    > +}
    > +
    > +static int cr_page_read(struct cr_ctx *ctx, struct page *page, char *buf)
    > +{
    > + void *ptr;
    > + int ret;
    > +
    > + ret = cr_kread(ctx, buf, PAGE_SIZE);
    > + if (ret < 0)
    > + return ret;
    > +
    > + ptr = kmap_atomic(page, KM_USER1);
    > + memcpy(ptr, buf, PAGE_SIZE);
    > + kunmap_atomic(page, KM_USER1);

    Here too, I think this should be changed to
    kunmap_atomic(ptr, KM_USER1);

    Regards,
    Nadia

    > +
    > + return 0;
    > +}
    > +
    > +/**
    > + * cr_read_pages_contents - read in data of pages in page-array chain
    > + * @ctx - restart context
    > + */
    > +static int cr_read_pages_contents(struct cr_ctx *ctx)
    > +{
    > + struct mm_struct *mm = current->mm;
    > + struct cr_pgarr *pgarr;
    > + unsigned long *vaddrs;
    > + char *buf;
    > + int i, ret = 0;
    > +
    > + buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
    > + if (!buf)
    > + return -ENOMEM;
    > +
    > + down_read(&mm->mmap_sem);
    > + list_for_each_entry_reverse(pgarr, &ctx->pgarr_list, list) {
    > + vaddrs = pgarr->vaddrs;
    > + for (i = 0; i < pgarr->nr_used; i++) {
    > + struct page *page;
    > +
    > + ret = get_user_pages(current, mm, vaddrs[i],
    > + 1, 1, 1, &page, NULL);
    > + if (ret < 0)
    > + goto out;
    > +
    > + ret = cr_page_read(ctx, page, buf);
    > + page_cache_release(page);
    > +
    > + if (ret < 0)
    > + goto out;
    > + }
    > + }
    > +
    > + out:
    > + up_read(&mm->mmap_sem);
    > + kfree(buf);
    > + return 0;
    > +}
    > +
    > +/**
    > + * cr_read_private_vma_contents - restore contents of a VMA with private memory
    > + * @ctx - restart context
    > + *
    > + * Reads a header that specifies how many pages will follow, then reads
    > + * a list of virtual addresses into ctx->pgarr_list page-array chain,
    > + * followed by the actual contents of the corresponding pages. Iterates
    > + * these steps until reaching a header specifying "0" pages, which marks
    > + * the end of the contents.
    > + */
    > +static int cr_read_private_vma_contents(struct cr_ctx *ctx)
    > +{
    > + struct cr_hdr_pgarr *hh;
    > + unsigned long nr_pages;
    > + int parent, ret = 0;
    > +
    > + while (1) {
    > + hh = cr_hbuf_get(ctx, sizeof(*hh));
    > + parent = cr_read_obj_type(ctx, hh, sizeof(*hh), CR_HDR_PGARR);
    > + if (parent != 0) {
    > + if (parent < 0)
    > + ret = parent;
    > + else
    > + ret = -EINVAL;
    > + cr_hbuf_put(ctx, sizeof(*hh));
    > + break;
    > + }
    > +
    > + cr_debug("nr_pages %ld\n", (unsigned long) hh->nr_pages);
    > +
    > + nr_pages = hh->nr_pages;
    > + cr_hbuf_put(ctx, sizeof(*hh));
    > +
    > + if (!nr_pages)
    > + break;
    > +
    > + ret = cr_read_pages_vaddrs(ctx, nr_pages);
    > + if (ret < 0)
    > + break;
    > + ret = cr_read_pages_contents(ctx);
    > + if (ret < 0)
    > + break;
    > + cr_pgarr_reset_all(ctx);
    > + }
    > +
    > + return ret;
    > +}
    > +
    > +/**
    > + * cr_calc_map_prot_bits - convert vm_flags to mmap protection
    > + * orig_vm_flags: source vm_flags
    > + */
    > +static unsigned long cr_calc_map_prot_bits(unsigned long orig_vm_flags)
    > +{
    > + unsigned long vm_prot = 0;
    > +
    > + if (orig_vm_flags & VM_READ)
    > + vm_prot |= PROT_READ;
    > + if (orig_vm_flags & VM_WRITE)
    > + vm_prot |= PROT_WRITE;
    > + if (orig_vm_flags & VM_EXEC)
    > + vm_prot |= PROT_EXEC;
    > + if (orig_vm_flags & PROT_SEM) /* only (?) with IPC-SHM */
    > + vm_prot |= PROT_SEM;
    > +
    > + return vm_prot;
    > +}
    > +
    > +/**
    > + * cr_calc_map_flags_bits - convert vm_flags to mmap flags
    > + * orig_vm_flags: source vm_flags
    > + */
    > +static unsigned long cr_calc_map_flags_bits(unsigned long orig_vm_flags)
    > +{
    > + unsigned long vm_flags = 0;
    > +
    > + vm_flags = MAP_FIXED;
    > + if (orig_vm_flags & VM_GROWSDOWN)
    > + vm_flags |= MAP_GROWSDOWN;
    > + if (orig_vm_flags & VM_DENYWRITE)
    > + vm_flags |= MAP_DENYWRITE;
    > + if (orig_vm_flags & VM_EXECUTABLE)
    > + vm_flags |= MAP_EXECUTABLE;
    > + if (orig_vm_flags & VM_MAYSHARE)
    > + vm_flags |= MAP_SHARED;
    > + else
    > + vm_flags |= MAP_PRIVATE;
    > +
    > + return vm_flags;
    > +}
    > +
    > +static int cr_read_vma(struct cr_ctx *ctx, struct mm_struct *mm)
    > +{
    > + struct cr_hdr_vma *hh = cr_hbuf_get(ctx, sizeof(*hh));
    > + unsigned long vm_size, vm_start, vm_flags, vm_prot, vm_pgoff;
    > + unsigned long addr;
    > + struct file *file = NULL;
    > + int parent, ret = -EINVAL;
    > +
    > + parent = cr_read_obj_type(ctx, hh, sizeof(*hh), CR_HDR_VMA);
    > + if (parent < 0) {
    > + ret = parent;
    > + goto err;
    > + } else if (parent != 0)
    > + goto err;
    > +
    > + cr_debug("vma %#lx-%#lx type %d\n", (unsigned long) hh->vm_start,
    > + (unsigned long) hh->vm_end, (int) hh->vma_type);
    > +
    > + if (hh->vm_end < hh->vm_start)
    > + goto err;
    > +
    > + vm_start = hh->vm_start;
    > + vm_pgoff = hh->vm_pgoff;
    > + vm_size = hh->vm_end - hh->vm_start;
    > + vm_prot = cr_calc_map_prot_bits(hh->vm_flags);
    > + vm_flags = cr_calc_map_flags_bits(hh->vm_flags);
    > +
    > + switch (hh->vma_type) {
    > +
    > + case CR_VMA_ANON: /* anonymous private mapping */
    > + if (vm_flags & VM_SHARED)
    > + goto err;
    > + /*
    > + * vm_pgoff for anonymous mapping is the "global" page
    > + * offset (namely from addr 0x0), so we force a zero
    > + */
    > + vm_pgoff = 0;
    > + break;
    > +
    > + case CR_VMA_FILE: /* private mapping from a file */
    > + if (vm_flags & VM_SHARED)
    > + goto err;
    > + /*
    > + * for private mapping using 'read-only' is sufficient
    > + */
    > + file = cr_read_open_fname(ctx, O_RDONLY, 0);
    > + if (IS_ERR(file)) {
    > + ret = PTR_ERR(file);
    > + goto err;
    > + }
    > + break;
    > +
    > + default:
    > + goto err;
    > +
    > + }
    > +
    > + cr_hbuf_put(ctx, sizeof(*hh));
    > +
    > + down_write(&mm->mmap_sem);
    > + addr = do_mmap_pgoff(file, vm_start, vm_size,
    > + vm_prot, vm_flags, vm_pgoff);
    > + up_write(&mm->mmap_sem);
    > + cr_debug("size %#lx prot %#lx flag %#lx pgoff %#lx => %#lx\n",
    > + vm_size, vm_prot, vm_flags, vm_pgoff, addr);
    > +
    > + /* the file (if opened) is now referenced by the vma */
    > + if (file)
    > + filp_close(file, NULL);
    > +
    > + if (IS_ERR((void *) addr))
    > + return PTR_ERR((void *) addr);
    > +
    > + /*
    > + * CR_VMA_ANON: read in memory as is
    > + * CR_VMA_FILE: read in memory as is
    > + * (more to follow ...)
    > + */
    > +
    > + switch (hh->vma_type) {
    > + case CR_VMA_ANON:
    > + case CR_VMA_FILE:
    > + /* standard case: read the data into the memory */
    > + ret = cr_read_private_vma_contents(ctx);
    > + break;
    > + }
    > +
    > + if (ret < 0)
    > + return ret;
    > +
    > + cr_debug("vma retval %d\n", ret);
    > + return 0;
    > +
    > + err:
    > + cr_hbuf_put(ctx, sizeof(*hh));
    > + return ret;
    > +}
    > +
    > +static int cr_destroy_mm(struct mm_struct *mm)
    > +{
    > + struct vm_area_struct *vmnext = mm->mmap;
    > + struct vm_area_struct *vma;
    > + int ret;
    > +
    > + while (vmnext) {
    > + vma = vmnext;
    > + vmnext = vmnext->vm_next;
    > + ret = do_munmap(mm, vma->vm_start, vma->vm_end-vma->vm_start);
    > + if (ret < 0) {
    > + pr_debug("CR: restart failed do_munmap (%d)\n", ret);
    > + return ret;
    > + }
    > + }
    > + return 0;
    > +}
    > +
    > +int cr_read_mm(struct cr_ctx *ctx)
    > +{
    > + struct cr_hdr_mm *hh = cr_hbuf_get(ctx, sizeof(*hh));
    > + struct mm_struct *mm;
    > + int nr, parent, ret;
    > +
    > + parent = cr_read_obj_type(ctx, hh, sizeof(*hh), CR_HDR_MM);
    > + if (parent < 0) {
    > + ret = parent;
    > + goto out;
    > + }
    > +
    > + ret = -EINVAL;
    > +#if 0 /* activate when containers are used */
    > + if (parent != task_pid_vnr(current))
    > + goto out;
    > +#endif
    > + cr_debug("map_count %d\n", hh->map_count);
    > +
    > + /* XXX need more sanity checks */
    > + if (hh->start_code > hh->end_code ||
    > + hh->start_data > hh->end_data || hh->map_count < 0)
    > + goto out;
    > +
    > + mm = current->mm;
    > +
    > + /* point of no return -- destruct current mm */
    > + down_write(&mm->mmap_sem);
    > + ret = cr_destroy_mm(mm);
    > + if (ret < 0) {
    > + up_write(&mm->mmap_sem);
    > + goto out;
    > + }
    > + mm->start_code = hh->start_code;
    > + mm->end_code = hh->end_code;
    > + mm->start_data = hh->start_data;
    > + mm->end_data = hh->end_data;
    > + mm->start_brk = hh->start_brk;
    > + mm->brk = hh->brk;
    > + mm->start_stack = hh->start_stack;
    > + mm->arg_start = hh->arg_start;
    > + mm->arg_end = hh->arg_end;
    > + mm->env_start = hh->env_start;
    > + mm->env_end = hh->env_end;
    > + up_write(&mm->mmap_sem);
    > +
    > + /* FIX: need also mm->flags */
    > +
    > + for (nr = hh->map_count; nr; nr--) {
    > + ret = cr_read_vma(ctx, mm);
    > + if (ret < 0)
    > + goto out;
    > + }
    > +
    > + ret = cr_read_mm_context(ctx, mm, hh->objref);
    > + out:
    > + cr_hbuf_put(ctx, sizeof(*hh));
    > + return ret;
    > +}
    > diff -puN include/asm-x86/checkpoint_hdr.h~v6_PATCH_5_9_Restore_memory_address_space include/asm-x86/checkpoint_hdr.h
    > --- linux-2.6.git/include/asm-x86/checkpoint_hdr.h~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/include/asm-x86/checkpoint_hdr.h 2008-10-16 10:53:36.000000000 -0700
    > @@ -74,4 +74,8 @@ struct cr_hdr_mm_context {
    > __s16 nldt;
    > } __attribute__((aligned(8)));
    >
    > +
    > +/* misc prototypes from kernel (not defined elsewhere) */
    > +asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount);
    > +
    > #endif /* __ASM_X86_CKPT_HDR__H */
    > diff -puN include/linux/checkpoint.h~v6_PATCH_5_9_Restore_memory_address_space include/linux/checkpoint.h
    > --- linux-2.6.git/include/linux/checkpoint.h~v6_PATCH_5_9_Restore_memory_address_space 2008-10-16 10:53:36.000000000 -0700
    > +++ linux-2.6.git-dave/include/linux/checkpoint.h 2008-10-16 10:53:36.000000000 -0700
    > @@ -55,6 +55,9 @@ extern int cr_write_fname(struct cr_ctx
    > extern int cr_read_obj(struct cr_ctx *ctx, struct cr_hdr *h, void *buf, int n);
    > extern int cr_read_obj_type(struct cr_ctx *ctx, void *buf, int n, int type);
    > extern int cr_read_string(struct cr_ctx *ctx, void *str, int len);
    > +extern int cr_read_fname(struct cr_ctx *ctx, void *fname, int n);
    > +extern struct file *cr_read_open_fname(struct cr_ctx *ctx,
    > + int flags, int mode);
    >
    > extern int cr_write_mm(struct cr_ctx *ctx, struct task_struct *t);
    > extern int cr_read_mm(struct cr_ctx *ctx);
    > _
    > _______________________________________________
    > Containers mailing list
    > Containers@lists.linux-foundation.org
    > https://lists.linux-foundation.org/mailman/listinfo/containers
    >
    --
    Nadia Derbey <Nadia.Derbey@bull.net>



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