281 lines
6.1 KiB
C
281 lines
6.1 KiB
C
/*
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* Persistent Storage Barebox filesystem layer
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* Copyright © 2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <common.h>
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#include <driver.h>
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#include <fs.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fs.h>
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#include <malloc.h>
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#include <init.h>
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#include <linux/stat.h>
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#include <linux/err.h>
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#include <linux/pstore.h>
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#include <libbb.h>
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#include <rtc.h>
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#include <libfile.h>
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#include <linux/pstore.h>
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#include "internal.h"
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struct list_head allpstore = LIST_HEAD_INIT(allpstore);
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struct pstore_private {
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char name[PSTORE_NAMELEN];
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struct list_head list;
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struct pstore_info *psi;
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enum pstore_type_id type;
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u64 id;
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int count;
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ssize_t size;
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ssize_t pos;
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char data[];
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};
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/*
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* Make a regular file in the root directory of our file system.
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* Load it up with "size" bytes of data from "buf".
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* Set the mtime & ctime to the date that this record was originally stored.
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*/
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int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
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char *data, bool compressed, size_t size,
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struct pstore_info *psi)
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{
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struct pstore_private *private, *pos;
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list_for_each_entry(pos, &allpstore, list) {
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if (pos->type == type && pos->id == id && pos->psi == psi)
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return -EEXIST;
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}
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private = xzalloc(sizeof(*private) + size);
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if (!private)
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return -ENOMEM;
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private->type = type;
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private->id = id;
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private->count = count;
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private->psi = psi;
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switch (type) {
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case PSTORE_TYPE_DMESG:
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scnprintf(private->name, sizeof(private->name),
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"dmesg-%s-%lld%s", psname, id,
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compressed ? ".enc.z" : "");
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break;
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case PSTORE_TYPE_CONSOLE:
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scnprintf(private->name, sizeof(private->name),
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"console-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_FTRACE:
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scnprintf(private->name, sizeof(private->name),
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"ftrace-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_MCE:
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scnprintf(private->name, sizeof(private->name),
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"mce-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_PPC_RTAS:
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scnprintf(private->name, sizeof(private->name),
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"rtas-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_PPC_OF:
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scnprintf(private->name, sizeof(private->name),
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"powerpc-ofw-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_PPC_COMMON:
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scnprintf(private->name, sizeof(private->name),
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"powerpc-common-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_PMSG:
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scnprintf(private->name, sizeof(private->name),
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"pmsg-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_UNKNOWN:
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scnprintf(private->name, sizeof(private->name),
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"unknown-%s-%lld", psname, id);
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break;
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default:
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scnprintf(private->name, sizeof(private->name),
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"type%d-%s-%lld", type, psname, id);
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break;
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}
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memcpy(private->data, data, size);
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private->size = size;
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list_add(&private->list, &allpstore);
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return 0;
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}
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static struct pstore_private *pstore_get_by_name(struct list_head *head,
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const char *name)
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{
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struct pstore_private *d;
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if (!name)
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return NULL;
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list_for_each_entry(d, head, list) {
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if (strcmp(d->name, name) == 0)
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return d;
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}
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return NULL;
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}
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static int pstore_open(struct device_d *dev, FILE *file, const char *filename)
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{
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struct list_head *head = dev->priv;
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struct pstore_private *d;
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if (filename[0] == '/')
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filename++;
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d = pstore_get_by_name(head, filename);
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if (!d)
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return -EINVAL;
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file->size = d->size;
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file->priv = d;
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d->pos = 0;
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return 0;
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}
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static int pstore_close(struct device_d *dev, FILE *file)
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{
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return 0;
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}
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static int pstore_read(struct device_d *dev, FILE *file, void *buf,
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size_t insize)
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{
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struct pstore_private *d = file->priv;
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memcpy(buf, &d->data[d->pos], insize);
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d->pos += insize;
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return insize;
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}
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static loff_t pstore_lseek(struct device_d *dev, FILE *file, loff_t pos)
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{
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struct pstore_private *d = file->priv;
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d->pos = pos;
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return pos;
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}
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static DIR *pstore_opendir(struct device_d *dev, const char *pathname)
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{
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DIR *dir;
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dir = xzalloc(sizeof(DIR));
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if (list_empty(&allpstore))
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return dir;
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dir->priv = list_first_entry(&allpstore, struct pstore_private, list);
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return dir;
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}
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static struct dirent *pstore_readdir(struct device_d *dev, DIR *dir)
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{
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struct pstore_private *d = dir->priv;
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if (!d || &d->list == &allpstore)
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return NULL;
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strcpy(dir->d.d_name, d->name);
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dir->priv = list_entry(d->list.next, struct pstore_private, list);
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return &dir->d;
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}
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static int pstore_closedir(struct device_d *dev, DIR *dir)
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{
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free(dir);
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return 0;
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}
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static int pstore_stat(struct device_d *dev, const char *filename,
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struct stat *s)
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{
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struct pstore_private *d;
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if (filename[0] == '/')
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filename++;
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d = pstore_get_by_name(&allpstore, filename);
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if (!d)
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return -EINVAL;
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s->st_size = d->size;
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s->st_mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO;
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return 0;
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}
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static void pstore_remove(struct device_d *dev)
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{
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struct pstore_private *d, *tmp;
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list_for_each_entry_safe(d, tmp, &allpstore, list) {
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free(d);
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}
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}
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static int pstore_probe(struct device_d *dev)
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{
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struct list_head *priv = &allpstore;
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dev->priv = priv;
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dev_dbg(dev, "mounted pstore\n");
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return 0;
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}
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static struct fs_driver_d pstore_driver = {
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.open = pstore_open,
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.close = pstore_close,
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.read = pstore_read,
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.lseek = pstore_lseek,
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.opendir = pstore_opendir,
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.readdir = pstore_readdir,
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.closedir = pstore_closedir,
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.stat = pstore_stat,
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.flags = FS_DRIVER_NO_DEV,
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.type = filetype_uimage,
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.drv = {
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.probe = pstore_probe,
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.remove = pstore_remove,
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.name = "pstore",
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}
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};
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static int pstore_init(void)
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{
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return register_fs_driver(&pstore_driver);
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}
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coredevice_initcall(pstore_init);
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