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/*
* lsfd-bdev.c - handle associations opening block devices
*
* Copyright (C) 2021 Red Hat, Inc. All rights reserved.
* Written by Masatake YAMATO <yamato@redhat.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lsfd.h"
static struct list_head partitions;
struct partition {
struct list_head partitions;
dev_t dev;
char *name;
};
static bool bdev_fill_column(struct proc *proc __attribute__((__unused__)),
struct file *file __attribute__((__unused__)),
struct libscols_line *ln,
int column_id,
size_t column_index,
const char *uri __attribute__((__unused__)))
{
char *str = NULL;
const char *partition, *devdrv;
switch(column_id) {
case COL_TYPE:
if (scols_line_set_data(ln, column_index, "BLK"))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
case COL_BLKDRV:
devdrv = get_blkdrv(major(file->stat.st_rdev));
if (devdrv)
str = xstrdup(devdrv);
else
xasprintf(&str, "%u",
major(file->stat.st_rdev));
break;
case COL_DEVTYPE:
if (scols_line_set_data(ln, column_index,
"blk"))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
case COL_SOURCE:
case COL_PARTITION:
partition = get_partition(file->stat.st_rdev);
if (partition) {
str = xstrdup(partition);
break;
}
devdrv = get_blkdrv(major(file->stat.st_rdev));
if (devdrv) {
xasprintf(&str, "%s:%u", devdrv,
minor(file->stat.st_rdev));
break;
}
/* FALL THROUGH */
case COL_MAJMIN:
xasprintf(&str, "%u:%u",
major(file->stat.st_rdev),
minor(file->stat.st_rdev));
break;
default:
return false;
}
if (!str)
err(EXIT_FAILURE, _("failed to add output data"));
if (scols_line_refer_data(ln, column_index, str))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
}
static struct partition *new_partition(dev_t dev, const char *name)
{
struct partition *partition = xcalloc(1, sizeof(*partition));
INIT_LIST_HEAD(&partition->partitions);
partition->dev = dev;
partition->name = xstrdup(name);
return partition;
}
static void free_partition(struct partition *partition)
{
free(partition->name);
free(partition);
}
static void read_partitions(struct list_head *partitions_list, FILE *part_fp)
{
unsigned int major, minor;
char line[256];
char name[sizeof(line)];
while (fgets(line, sizeof(line), part_fp)) {
struct partition *partition;
if (sscanf(line, "%u %u %*u %s", &major, &minor, name) != 3)
continue;
partition = new_partition(makedev(major, minor), name);
list_add_tail(&partition->partitions, partitions_list);
}
}
static void bdev_class_initialize(void)
{
FILE *part_fp;
INIT_LIST_HEAD(&partitions);
part_fp = fopen("/proc/partitions", "r");
if (part_fp) {
read_partitions(&partitions, part_fp);
fclose(part_fp);
}
}
static void bdev_class_finalize(void)
{
list_free(&partitions, struct partition, partitions, free_partition);
}
const char *get_partition(dev_t dev)
{
struct list_head *p;
list_for_each(p, &partitions) {
struct partition *partition = list_entry(p, struct partition, partitions);
if (partition->dev == dev)
return partition->name;
}
return NULL;
}
const struct file_class bdev_class = {
.super = &file_class,
.size = sizeof(struct file),
.initialize_class = bdev_class_initialize,
.finalize_class = bdev_class_finalize,
.fill_column = bdev_fill_column,
.free_content = NULL,
};
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