On Thu, Sep 04, 2008 at 04:05:50AM -0400, Oren Laadan wrote: > > Dump the files_struct of a task with 'struct cr_hdr_files', followed by > all open file descriptors. Since FDs can be shared, they are assigned a > tag and registered in the object hash. > > For each open FD there is a 'struct cr_hdr_fd_ent' with the FD, its tag > and its close-on-exec property. If the FD is to be saved (first time) > then this is followed by a 'struct cr_hdr_fd_data' with the FD state. > Then will come the next FD and so on. > > This patch only handles basic FDs - regular files, directories and also > symbolic links. >
[...]
> diff --git a/checkpoint/ckpt_file.c b/checkpoint/ckpt_file.c
> new file mode 100644
> index 0000000..34df371
> --- /dev/null
> +++ b/checkpoint/ckpt_file.c
> @@ -0,0 +1,224 @@
> +/*
> + * Checkpoint file descriptors
> + *
> + * 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/file.h>
> +#include <linux/fdtable.h>
> +#include <linux/ckpt.h>
> +#include <linux/ckpt_hdr.h>
> +
> +#include "ckpt_file.h"
> +
> +#define CR_DEFAULT_FDTABLE 256
> +
> +/**
> + * cr_scan_fds - scan file table and construct array of open fds
> + * @files: files_struct pointer
> + * @fdtable: (output) array of open fds
> + * @return: the number of open fds found
> + *
> + * Allocates the file descriptors array (*fdtable), caller should free
> + */
> +int cr_scan_fds(struct files_struct *files, int **fdtable)
> +{
> + struct fdtable *fdt;
> + int *fdlist;
> + int i, n, max;
> +
> + max = CR_DEFAULT_FDTABLE;
> +
> + repeat:
> + n = 0;
> + fdlist = kmalloc(max * sizeof(*fdlist), GFP_KERNEL);
> + if (!fdlist)
> + return -ENOMEM;
> +
> + spin_lock(&files->file_lock);
> + fdt = files_fdtable(files);
> + for (i = 0; i < fdt->max_fds; i++) {
> + if (fcheck_files(files, i)) {
> + if (n == max) {
> + spin_unlock(&files->file_lock);
> + kfree(fdlist);
> + max *= 2;
> + if (max < 0) { /* overflow ? */
> + n = -EMFILE;
> + break;
> + }
> + goto repeat;
fdlist = krealloc(fdlist, max, GFP_KERNEL)?
Sorry, I should have suggested this in my first review.
Louis
> + }
> + fdlist[n++] = i;
> + }
> + }
> + spin_unlock(&files->file_lock);
> +
> + *fdtable = fdlist;
> + return n;
> +}
> +
--
Dr Louis Rilling Kerlabs
Skype: louis.rilling Batiment Germanium
Phone: (+33|0) 6 80 89 08 23 80 avenue des Buttes de Coesmes
http://www.kerlabs.com/ 35700 Rennes
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