pstore: new filesystem interface to platform persistent storage
Some platforms have a small amount of non-volatile storage that can be used to store information useful to diagnose the cause of a system crash. This is the generic part of a file system interface that presents information from the crash as a series of files in /dev/pstore. Once the information has been seen, the underlying storage is freed by deleting the files. Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tony Luck
parent
90a8a73c06
commit
ca01d6dd2d
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@ -0,0 +1,35 @@
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Where: /dev/pstore/...
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Date: January 2011
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Kernel Version: 2.6.38
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Contact: tony.luck@intel.com
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Description: Generic interface to platform dependent persistent storage.
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Platforms that provide a mechanism to preserve some data
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across system reboots can register with this driver to
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provide a generic interface to show records captured in
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the dying moments. In the case of a panic the last part
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of the console log is captured, but other interesting
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data can also be saved.
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# mount -t pstore - /dev/pstore
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$ ls -l /dev/pstore
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total 0
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-r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1
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Different users of this interface will result in different
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filename prefixes. Currently two are defined:
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"dmesg" - saved console log
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"mce" - architecture dependent data from fatal h/w error
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Once the information in a file has been read, removing
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the file will signal to the underlying persistent storage
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device that it can reclaim the space for later re-use.
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$ rm /dev/pstore/dmesg-erst-1
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The expectation is that all files in /dev/pstore
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will be saved elsewhere and erased from persistent store
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soon after boot to free up space ready for the next
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catastrophe.
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@ -0,0 +1,7 @@
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What: /sys/fs/pstore/kmsg_bytes
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Date: January 2011
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Kernel Version: 2.6.38
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Contact: "Tony Luck" <tony.luck@intel.com>
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Description:
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Controls amount of console log that will be saved
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to persistent store on oops/panic.
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@ -188,6 +188,7 @@ source "fs/omfs/Kconfig"
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source "fs/hpfs/Kconfig"
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source "fs/qnx4/Kconfig"
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source "fs/romfs/Kconfig"
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source "fs/pstore/Kconfig"
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source "fs/sysv/Kconfig"
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source "fs/ufs/Kconfig"
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source "fs/exofs/Kconfig"
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@ -121,3 +121,4 @@ obj-$(CONFIG_BTRFS_FS) += btrfs/
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obj-$(CONFIG_GFS2_FS) += gfs2/
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obj-$(CONFIG_EXOFS_FS) += exofs/
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obj-$(CONFIG_CEPH_FS) += ceph/
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obj-$(CONFIG_PSTORE) += pstore/
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@ -0,0 +1,13 @@
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config PSTORE
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bool "Persistant store support"
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default n
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help
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This option enables generic access to platform level
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persistent storage via "pstore" filesystem that can
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be mounted as /dev/pstore. Only useful if you have
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a platform level driver that registers with pstore to
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provide the data, so you probably should just go say "Y"
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(or "M") to a platform specific persistent store driver
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(e.g. ACPI_APEI on X86) which will select this for you.
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If you don't have a platform persistent store driver,
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say N.
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@ -0,0 +1,7 @@
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#
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# Makefile for the linux pstorefs routines.
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#
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obj-y += pstore.o
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pstore-objs += inode.o platform.o
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@ -0,0 +1,280 @@
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/*
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* Persistent Storage - ramfs parts.
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*
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* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
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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 version 2 as
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* published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/fsnotify.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/mount.h>
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#include <linux/ramfs.h>
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#include <linux/sched.h>
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#include <linux/magic.h>
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#include <linux/pstore.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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#define PSTORE_NAMELEN 64
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struct pstore_private {
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u64 id;
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int (*erase)(u64);
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};
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#define pstore_get_inode ramfs_get_inode
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/*
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* When a file is unlinked from our file system we call the
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* platform driver to erase the record from persistent store.
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*/
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static int pstore_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct pstore_private *p = dentry->d_inode->i_private;
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p->erase(p->id);
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kfree(p);
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return simple_unlink(dir, dentry);
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}
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static const struct inode_operations pstore_dir_inode_operations = {
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.lookup = simple_lookup,
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.unlink = pstore_unlink,
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};
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static const struct super_operations pstore_ops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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.show_options = generic_show_options,
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};
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static struct super_block *pstore_sb;
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static struct vfsmount *pstore_mnt;
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int pstore_is_mounted(void)
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{
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return pstore_mnt != NULL;
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}
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/*
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* Set up a file structure as if we had opened this file and
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* write our data to it.
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*/
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static int pstore_writefile(struct inode *inode, struct dentry *dentry,
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char *data, size_t size)
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{
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struct file f;
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ssize_t n;
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mm_segment_t old_fs = get_fs();
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memset(&f, '0', sizeof f);
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f.f_mapping = inode->i_mapping;
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f.f_path.dentry = dentry;
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f.f_path.mnt = pstore_mnt;
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f.f_pos = 0;
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f.f_op = inode->i_fop;
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set_fs(KERNEL_DS);
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n = do_sync_write(&f, data, size, &f.f_pos);
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set_fs(old_fs);
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fsnotify_modify(&f);
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return n == size;
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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,
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char *data, size_t size,
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struct timespec time, int (*erase)(u64))
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{
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struct dentry *root = pstore_sb->s_root;
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struct dentry *dentry;
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struct inode *inode;
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int rc;
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char name[PSTORE_NAMELEN];
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struct pstore_private *private;
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rc = -ENOMEM;
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inode = pstore_get_inode(pstore_sb, root->d_inode, S_IFREG | 0444, 0);
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if (!inode)
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goto fail;
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inode->i_uid = inode->i_gid = 0;
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private = kmalloc(sizeof *private, GFP_KERNEL);
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if (!private)
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goto fail_alloc;
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private->id = id;
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private->erase = erase;
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switch (type) {
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case PSTORE_TYPE_DMESG:
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sprintf(name, "dmesg-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_MCE:
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sprintf(name, "mce-%s-%lld", psname, id);
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break;
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case PSTORE_TYPE_UNKNOWN:
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sprintf(name, "unknown-%s-%lld", psname, id);
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break;
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default:
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sprintf(name, "type%d-%s-%lld", type, psname, id);
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break;
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}
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mutex_lock(&root->d_inode->i_mutex);
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rc = -ENOSPC;
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dentry = d_alloc_name(root, name);
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if (IS_ERR(dentry))
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goto fail_lockedalloc;
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d_add(dentry, inode);
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mutex_unlock(&root->d_inode->i_mutex);
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if (!pstore_writefile(inode, dentry, data, size))
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goto fail_write;
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inode->i_private = private;
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if (time.tv_sec)
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inode->i_mtime = inode->i_ctime = time;
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return 0;
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fail_write:
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kfree(private);
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inode->i_nlink--;
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mutex_lock(&root->d_inode->i_mutex);
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d_delete(dentry);
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dput(dentry);
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mutex_unlock(&root->d_inode->i_mutex);
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goto fail;
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fail_lockedalloc:
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mutex_unlock(&root->d_inode->i_mutex);
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kfree(private);
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fail_alloc:
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iput(inode);
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fail:
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return rc;
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}
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int pstore_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct inode *inode = NULL;
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struct dentry *root;
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int err;
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save_mount_options(sb, data);
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pstore_sb = sb;
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_magic = PSTOREFS_MAGIC;
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sb->s_op = &pstore_ops;
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sb->s_time_gran = 1;
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inode = pstore_get_inode(sb, NULL, S_IFDIR | 0755, 0);
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if (!inode) {
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err = -ENOMEM;
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goto fail;
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}
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/* override ramfs "dir" options so we catch unlink(2) */
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inode->i_op = &pstore_dir_inode_operations;
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root = d_alloc_root(inode);
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sb->s_root = root;
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if (!root) {
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err = -ENOMEM;
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goto fail;
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}
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pstore_get_records();
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return 0;
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fail:
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iput(inode);
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return err;
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}
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static int pstore_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data, struct vfsmount *mnt)
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{
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struct dentry *root;
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root = mount_nodev(fs_type, flags, data, pstore_fill_super);
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if (IS_ERR(root))
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return -ENOMEM;
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mnt->mnt_root = root;
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mnt->mnt_sb = root->d_sb;
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pstore_mnt = mnt;
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return 0;
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}
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static void pstore_kill_sb(struct super_block *sb)
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{
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kill_litter_super(sb);
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pstore_sb = NULL;
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pstore_mnt = NULL;
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}
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static struct file_system_type pstore_fs_type = {
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.name = "pstore",
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.get_sb = pstore_get_sb,
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.kill_sb = pstore_kill_sb,
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};
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static int __init init_pstore_fs(void)
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{
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int ret = 0;
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struct kobject *pstorefs_kobj;
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pstorefs_kobj = kobject_create_and_add("pstore", fs_kobj);
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if (!pstorefs_kobj)
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return -ENOMEM;
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sysfs_create_file(pstorefs_kobj, &pstore_kmsg_bytes_attr.attr);
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ret = register_filesystem(&pstore_fs_type);
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if (ret) {
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sysfs_remove_file(pstorefs_kobj, &pstore_kmsg_bytes_attr.attr);
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kobject_put(pstorefs_kobj);
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}
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return ret;
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}
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module_init(init_pstore_fs)
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MODULE_AUTHOR("Tony Luck <tony.luck@intel.com>");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,7 @@
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extern void pstore_get_records(void);
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extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
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char *data, size_t size,
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struct timespec time, int (*erase)(u64));
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extern int pstore_is_mounted(void);
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extern struct kobj_attribute pstore_kmsg_bytes_attr;
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@ -0,0 +1,202 @@
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/*
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* Persistent Storage - platform driver interface parts.
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*
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* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
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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 version 2 as
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* published by the Free Software Foundation.
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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, write to the Free Software
|
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/atomic.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kmsg_dump.h>
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#include <linux/module.h>
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#include <linux/pstore.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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/*
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* pstore_lock just protects "psinfo" during
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* calls to pstore_register()
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*/
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static DEFINE_SPINLOCK(pstore_lock);
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static struct pstore_info *psinfo;
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/* How much of the console log to snapshot. /sys/fs/pstore/kmsg_bytes */
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static unsigned long kmsg_bytes = 10240;
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static ssize_t b_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%lu\n", kmsg_bytes);
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}
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static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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return (sscanf(buf, "%lu", &kmsg_bytes) > 0) ? count : 0;
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}
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struct kobj_attribute pstore_kmsg_bytes_attr =
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__ATTR(kmsg_bytes, S_IRUGO | S_IWUSR, b_show, b_store);
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/* Tag each group of saved records with a sequence number */
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static int oopscount;
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/*
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* callback from kmsg_dump. (s2,l2) has the most recently
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* written bytes, older bytes are in (s1,l1). Save as much
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* as we can from the end of the buffer.
|
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*/
|
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static void pstore_dump(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason,
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const char *s1, unsigned long l1,
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const char *s2, unsigned long l2)
|
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{
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unsigned long s1_start, s2_start;
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unsigned long l1_cpy, l2_cpy;
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unsigned long size, total = 0;
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char *dst;
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u64 id;
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int hsize, part = 1;
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|
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mutex_lock(&psinfo->buf_mutex);
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oopscount++;
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while (total < kmsg_bytes) {
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dst = psinfo->buf;
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hsize = sprintf(dst, "Oops#%d Part%d\n", oopscount, part++);
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size = psinfo->bufsize - hsize;
|
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dst += hsize;
|
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|
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l2_cpy = min(l2, size);
|
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l1_cpy = min(l1, size - l2_cpy);
|
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|
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if (l1_cpy + l2_cpy == 0)
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break;
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s2_start = l2 - l2_cpy;
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s1_start = l1 - l1_cpy;
|
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|
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memcpy(dst, s1 + s1_start, l1_cpy);
|
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memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
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|
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id = psinfo->write(PSTORE_TYPE_DMESG, hsize + l1_cpy + l2_cpy);
|
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if (pstore_is_mounted())
|
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pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id,
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psinfo->buf, hsize + l1_cpy + l2_cpy,
|
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CURRENT_TIME, psinfo->erase);
|
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l1 -= l1_cpy;
|
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l2 -= l2_cpy;
|
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total += l1_cpy + l2_cpy;
|
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}
|
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mutex_unlock(&psinfo->buf_mutex);
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}
|
||||
|
||||
static struct kmsg_dumper pstore_dumper = {
|
||||
.dump = pstore_dump,
|
||||
};
|
||||
|
||||
/*
|
||||
* platform specific persistent storage driver registers with
|
||||
* us here. If pstore is already mounted, call the platform
|
||||
* read function right away to populate the file system. If not
|
||||
* then the pstore mount code will call us later to fill out
|
||||
* the file system.
|
||||
*
|
||||
* Register with kmsg_dump to save last part of console log on panic.
|
||||
*/
|
||||
int pstore_register(struct pstore_info *psi)
|
||||
{
|
||||
struct module *owner = psi->owner;
|
||||
|
||||
spin_lock(&pstore_lock);
|
||||
if (psinfo) {
|
||||
spin_unlock(&pstore_lock);
|
||||
return -EBUSY;
|
||||
}
|
||||
psinfo = psi;
|
||||
spin_unlock(&pstore_lock);
|
||||
|
||||
if (owner && !try_module_get(owner)) {
|
||||
psinfo = NULL;
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (pstore_is_mounted())
|
||||
pstore_get_records();
|
||||
|
||||
kmsg_dump_register(&pstore_dumper);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pstore_register);
|
||||
|
||||
/*
|
||||
* Read all the records from the persistent store. Create and
|
||||
* file files in our filesystem.
|
||||
*/
|
||||
void pstore_get_records(void)
|
||||
{
|
||||
struct pstore_info *psi = psinfo;
|
||||
size_t size;
|
||||
u64 id;
|
||||
enum pstore_type_id type;
|
||||
struct timespec time;
|
||||
int failed = 0;
|
||||
|
||||
if (!psi)
|
||||
return;
|
||||
|
||||
mutex_lock(&psinfo->buf_mutex);
|
||||
while ((size = psi->read(&id, &type, &time)) > 0) {
|
||||
if (pstore_mkfile(type, psi->name, id, psi->buf, size,
|
||||
time, psi->erase))
|
||||
failed++;
|
||||
}
|
||||
mutex_unlock(&psinfo->buf_mutex);
|
||||
|
||||
if (failed)
|
||||
printk(KERN_WARNING "pstore: failed to load %d record(s) from '%s'\n",
|
||||
failed, psi->name);
|
||||
}
|
||||
|
||||
/*
|
||||
* Call platform driver to write a record to the
|
||||
* persistent store.
|
||||
*/
|
||||
int pstore_write(enum pstore_type_id type, char *buf, size_t size)
|
||||
{
|
||||
u64 id;
|
||||
|
||||
if (!psinfo)
|
||||
return -ENODEV;
|
||||
|
||||
if (size > psinfo->bufsize)
|
||||
return -EFBIG;
|
||||
|
||||
mutex_lock(&psinfo->buf_mutex);
|
||||
memcpy(psinfo->buf, buf, size);
|
||||
id = psinfo->write(type, size);
|
||||
if (pstore_is_mounted())
|
||||
pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id, psinfo->buf,
|
||||
size, CURRENT_TIME, psinfo->erase);
|
||||
mutex_unlock(&psinfo->buf_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pstore_write);
|
||||
|
|
@ -26,6 +26,7 @@
|
|||
#define ISOFS_SUPER_MAGIC 0x9660
|
||||
#define JFFS2_SUPER_MAGIC 0x72b6
|
||||
#define ANON_INODE_FS_MAGIC 0x09041934
|
||||
#define PSTOREFS_MAGIC 0x6165676C
|
||||
|
||||
#define MINIX_SUPER_MAGIC 0x137F /* original minix fs */
|
||||
#define MINIX_SUPER_MAGIC2 0x138F /* minix fs, 30 char names */
|
||||
|
|
|
|||
|
|
@ -0,0 +1,60 @@
|
|||
/*
|
||||
* Persistent Storage - pstore.h
|
||||
*
|
||||
* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
|
||||
*
|
||||
* This code is the generic layer to export data records from platform
|
||||
* level persistent storage via a file system.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will 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
|
||||
*/
|
||||
#ifndef _LINUX_PSTORE_H
|
||||
#define _LINUX_PSTORE_H
|
||||
|
||||
/* types */
|
||||
enum pstore_type_id {
|
||||
PSTORE_TYPE_DMESG = 0,
|
||||
PSTORE_TYPE_MCE = 1,
|
||||
PSTORE_TYPE_UNKNOWN = 255
|
||||
};
|
||||
|
||||
struct pstore_info {
|
||||
struct module *owner;
|
||||
char *name;
|
||||
struct mutex buf_mutex; /* serialize access to 'buf' */
|
||||
char *buf;
|
||||
size_t bufsize;
|
||||
size_t (*read)(u64 *id, enum pstore_type_id *type,
|
||||
struct timespec *time);
|
||||
u64 (*write)(enum pstore_type_id type, size_t size);
|
||||
int (*erase)(u64 id);
|
||||
};
|
||||
|
||||
#ifdef CONFIG_PSTORE
|
||||
extern int pstore_register(struct pstore_info *);
|
||||
extern int pstore_write(enum pstore_type_id type, char *buf, size_t size);
|
||||
#else
|
||||
static inline int
|
||||
pstore_register(struct pstore_info *psi)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline int
|
||||
pstore_write(enum pstore_type_id type, char *buf, size_t size)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /*_LINUX_PSTORE_H*/
|
||||
Reference in New Issue