[RFC][PATCH 5/5] add c/r info to fdinfo

Dave Hansen
2009-02-19T18:22:00Z

Use the new checkpoint/restart file functions to query
and report on each fd in the /proc/$$/fdinfo/X file.

This should provide an easy way to examine processes
at runtime to see what exactly is causing their inability
to checkpoint.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
---

linux-2.6.git-dave/fs/proc/base.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff -puN fs/proc/base.c~add-cr-part-to-fdinfo fs/proc/base.c
--- linux-2.6.git/fs/proc/base.c~add-cr-part-to-fdinfo 2009-02-19 10:17:26.000000000 -0800
+++ linux-2.6.git-dave/fs/proc/base.c 2009-02-19 10:17:26.000000000 -0800
@@ -79,6 +79,7 @@
#include <linux/oom.h>
#include <linux/elf.h>
#include <linux/pid_namespace.h>
+#include <linux/checkpoint.h>
#include "internal.h"

/* NOTE:
@@ -1601,6 +1602,7 @@ out:

static void proc_fd_write_info(struct file *file, char *info)
{
+ int checkpointable;
int max = PROC_FDINFO_MAX;
int p = 0;
if (!info)
@@ -1608,6 +1610,12 @@ static void proc_fd_write_info(struct fi

p += snprintf(info+p, max-p, "pos:\t%lli\n", (long long) file->f_pos);
p += snprintf(info+p, max-p, "flags:\t0%o\n", file->f_flags);
+
+ checkpointable = cr_file_supported(file);
+ p += snprintf(info+p, max-p, "checkpointable:\t%d", checkpointable);
+ if (!checkpointable)
+ p += cr_explain_file(file, info+p, max-p);
+ p += snprintf(info+p, max-p, "\n");
}

static int proc_fd_info(struct inode *inode, struct path *path, char *info)
_