From a36159eec6ca17402b0e146b86efaf76568dc353 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 20 Sep 2024 01:41:23 +0000
Subject: [PATCH] 重命名 AX88772C_eeprom/asix.c 为 asix_mac.c
---
kernel/fs/pstore/inode.c | 244 +++++++++++++++++++++---------------------------
1 files changed, 107 insertions(+), 137 deletions(-)
diff --git a/kernel/fs/pstore/inode.c b/kernel/fs/pstore/inode.c
index 39926e5..29c91fd 100644
--- a/kernel/fs/pstore/inode.c
+++ b/kernel/fs/pstore/inode.c
@@ -1,20 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Persistent Storage - ramfs parts.
*
* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
- *
- * 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
*/
#include <linux/module.h>
@@ -34,10 +22,9 @@
#include <linux/magic.h>
#include <linux/pstore.h>
#include <linux/slab.h>
-#include <linux/spinlock.h>
#include <linux/uaccess.h>
-#ifdef CONFIG_PSTORE_MCU_LOG
+#ifdef CONFIG_PSTORE_BOOT_LOG
#include <linux/pstore_ram.h>
#include <linux/io.h>
#endif
@@ -46,11 +33,15 @@
#define PSTORE_NAMELEN 64
-static DEFINE_SPINLOCK(allpstore_lock);
-static LIST_HEAD(allpstore);
+static DEFINE_MUTEX(records_list_lock);
+static LIST_HEAD(records_list);
+
+static DEFINE_MUTEX(pstore_sb_lock);
+static struct super_block *pstore_sb;
struct pstore_private {
struct list_head list;
+ struct dentry *dentry;
struct pstore_record *record;
size_t total_size;
};
@@ -123,7 +114,7 @@
rec = (struct pstore_ftrace_record *)(ps->record->buf + data->off);
- seq_printf(s, "CPU:%d ts:%llu %08lx %08lx %pf <- %pF\n",
+ seq_printf(s, "CPU:%d ts:%llu %08lx %08lx %ps <- %pS\n",
pstore_ftrace_decode_cpu(rec),
pstore_ftrace_read_timestamp(rec),
rec->ip, rec->parent_ip, (void *)rec->ip,
@@ -144,40 +135,14 @@
{
struct seq_file *sf = file->private_data;
struct pstore_private *ps = sf->private;
-#ifdef CONFIG_PSTORE_MCU_LOG
+#ifdef CONFIG_PSTORE_BOOT_LOG
+ size_t size = 0;
struct pstore_record *record = ps->record;
- struct ramoops_context *cxt = record->psi->data;
- struct persistent_ram_zone *prz;
- struct persistent_ram_buffer *buffer;
- char *log_tmp;
- size_t size, start, n;
- if (ps->record->type == PSTORE_TYPE_MCU_LOG) {
-
- if (!cxt)
- return count;
-
- prz = cxt->mcu_przs[record->id];
-
- if (!prz)
- return count;
-
- buffer = prz->buffer;
- if (!buffer)
- return count;
-
- size = atomic_read(&buffer->size);
- start = atomic_read(&buffer->start);
-
- log_tmp = kmalloc(size, GFP_KERNEL);
- if (!log_tmp)
- return count;
- memcpy_fromio(log_tmp, &buffer->data[start], size - start);
- memcpy_fromio(log_tmp + size - start, &buffer->data[0], start);
-
- n = simple_read_from_buffer(userbuf, count, ppos, log_tmp, size);
- kfree(log_tmp);
- return n;
+ if (record->type == PSTORE_TYPE_BOOT_LOG) {
+ size = ramoops_pstore_read_for_boot_log(ps->record);
+ size = simple_read_from_buffer(userbuf, count, ppos, record->buf, size);
+ return size;
}
#endif
if (ps->record->type == PSTORE_TYPE_FTRACE)
@@ -230,9 +195,21 @@
{
struct pstore_private *p = d_inode(dentry)->i_private;
struct pstore_record *record = p->record;
+ int rc = 0;
if (!record->psi->erase)
return -EPERM;
+
+ /* Make sure we can't race while removing this file. */
+ mutex_lock(&records_list_lock);
+ if (!list_empty(&p->list))
+ list_del_init(&p->list);
+ else
+ rc = -ENOENT;
+ p->dentry = NULL;
+ mutex_unlock(&records_list_lock);
+ if (rc)
+ return rc;
mutex_lock(&record->psi->read_mutex);
record->psi->erase(record);
@@ -244,15 +221,9 @@
static void pstore_evict_inode(struct inode *inode)
{
struct pstore_private *p = inode->i_private;
- unsigned long flags;
clear_inode(inode);
- if (p) {
- spin_lock_irqsave(&allpstore_lock, flags);
- list_del(&p->list);
- spin_unlock_irqrestore(&allpstore_lock, flags);
- free_pstore_private(p);
- }
+ free_pstore_private(p);
}
static const struct inode_operations pstore_dir_inode_operations = {
@@ -330,11 +301,54 @@
.show_options = pstore_show_options,
};
-static struct super_block *pstore_sb;
-
-bool pstore_is_mounted(void)
+static struct dentry *psinfo_lock_root(void)
{
- return pstore_sb != NULL;
+ struct dentry *root;
+
+ mutex_lock(&pstore_sb_lock);
+ /*
+ * Having no backend is fine -- no records appear.
+ * Not being mounted is fine -- nothing to do.
+ */
+ if (!psinfo || !pstore_sb) {
+ mutex_unlock(&pstore_sb_lock);
+ return NULL;
+ }
+
+ root = pstore_sb->s_root;
+ inode_lock(d_inode(root));
+ mutex_unlock(&pstore_sb_lock);
+
+ return root;
+}
+
+int pstore_put_backend_records(struct pstore_info *psi)
+{
+ struct pstore_private *pos, *tmp;
+ struct dentry *root;
+ int rc = 0;
+
+ root = psinfo_lock_root();
+ if (!root)
+ return 0;
+
+ mutex_lock(&records_list_lock);
+ list_for_each_entry_safe(pos, tmp, &records_list, list) {
+ if (pos->record->psi == psi) {
+ list_del_init(&pos->list);
+ rc = simple_unlink(d_inode(root), pos->dentry);
+ if (WARN_ON(rc))
+ break;
+ d_drop(pos->dentry);
+ dput(pos->dentry);
+ pos->dentry = NULL;
+ }
+ }
+ mutex_unlock(&records_list_lock);
+
+ inode_unlock(d_inode(root));
+
+ return rc;
}
/*
@@ -349,23 +363,20 @@
int rc = 0;
char name[PSTORE_NAMELEN];
struct pstore_private *private, *pos;
- unsigned long flags;
size_t size = record->size + record->ecc_notice_size;
- WARN_ON(!inode_is_locked(d_inode(root)));
+ if (WARN_ON(!inode_is_locked(d_inode(root))))
+ return -EINVAL;
- spin_lock_irqsave(&allpstore_lock, flags);
- list_for_each_entry(pos, &allpstore, list) {
+ rc = -EEXIST;
+ /* Skip records that are already present in the filesystem. */
+ mutex_lock(&records_list_lock);
+ list_for_each_entry(pos, &records_list, list) {
if (pos->record->type == record->type &&
pos->record->id == record->id &&
- pos->record->psi == record->psi) {
- rc = -EEXIST;
- break;
- }
+ pos->record->psi == record->psi)
+ goto fail;
}
- spin_unlock_irqrestore(&allpstore_lock, flags);
- if (rc)
- return rc;
rc = -ENOMEM;
inode = pstore_get_inode(root->d_sb);
@@ -373,59 +384,10 @@
goto fail;
inode->i_mode = S_IFREG | 0444;
inode->i_fop = &pstore_file_operations;
-
- switch (record->type) {
- case PSTORE_TYPE_DMESG:
- scnprintf(name, sizeof(name), "dmesg-%s-%llu%s",
- record->psi->name, record->id,
- record->compressed ? ".enc.z" : "");
- break;
- case PSTORE_TYPE_CONSOLE:
- scnprintf(name, sizeof(name), "console-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_FTRACE:
- scnprintf(name, sizeof(name), "ftrace-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_MCE:
- scnprintf(name, sizeof(name), "mce-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_PPC_RTAS:
- scnprintf(name, sizeof(name), "rtas-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_PPC_OF:
- scnprintf(name, sizeof(name), "powerpc-ofw-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_PPC_COMMON:
- scnprintf(name, sizeof(name), "powerpc-common-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_PMSG:
- scnprintf(name, sizeof(name), "pmsg-%s-%llu",
- record->psi->name, record->id);
- break;
- case PSTORE_TYPE_PPC_OPAL:
- scnprintf(name, sizeof(name), "powerpc-opal-%s-%llu",
- record->psi->name, record->id);
- break;
-#ifdef CONFIG_PSTORE_MCU_LOG
- case PSTORE_TYPE_MCU_LOG:
- scnprintf(name, sizeof(name), "mcu-log-%llu", record->id);
- break;
-#endif
- case PSTORE_TYPE_UNKNOWN:
- scnprintf(name, sizeof(name), "unknown-%s-%llu",
- record->psi->name, record->id);
- break;
- default:
- scnprintf(name, sizeof(name), "type%d-%s-%llu",
- record->type, record->psi->name, record->id);
- break;
- }
+ scnprintf(name, sizeof(name), "%s-%s-%llu%s",
+ pstore_type_to_name(record->type),
+ record->psi->name, record->id,
+ record->compressed ? ".enc.z" : "");
private = kzalloc(sizeof(*private), GFP_KERNEL);
if (!private)
@@ -435,6 +397,7 @@
if (!dentry)
goto fail_private;
+ private->dentry = dentry;
private->record = record;
inode->i_size = private->total_size = size;
inode->i_private = private;
@@ -444,9 +407,8 @@
d_add(dentry, inode);
- spin_lock_irqsave(&allpstore_lock, flags);
- list_add(&private->list, &allpstore);
- spin_unlock_irqrestore(&allpstore_lock, flags);
+ list_add(&private->list, &records_list);
+ mutex_unlock(&records_list_lock);
return 0;
@@ -454,8 +416,8 @@
free_pstore_private(private);
fail_inode:
iput(inode);
-
fail:
+ mutex_unlock(&records_list_lock);
return rc;
}
@@ -467,24 +429,19 @@
*/
void pstore_get_records(int quiet)
{
- struct pstore_info *psi = psinfo;
struct dentry *root;
- if (!psi || !pstore_sb)
+ root = psinfo_lock_root();
+ if (!root)
return;
- root = pstore_sb->s_root;
-
- inode_lock(d_inode(root));
- pstore_get_backend_records(psi, root, quiet);
+ pstore_get_backend_records(psinfo, root, quiet);
inode_unlock(d_inode(root));
}
static int pstore_fill_super(struct super_block *sb, void *data, int silent)
{
struct inode *inode;
-
- pstore_sb = sb;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_SIZE;
@@ -506,6 +463,10 @@
if (!sb->s_root)
return -ENOMEM;
+ mutex_lock(&pstore_sb_lock);
+ pstore_sb = sb;
+ mutex_unlock(&pstore_sb_lock);
+
pstore_get_records(0);
return 0;
@@ -519,8 +480,17 @@
static void pstore_kill_sb(struct super_block *sb)
{
+ mutex_lock(&pstore_sb_lock);
+ WARN_ON(pstore_sb && pstore_sb != sb);
+
kill_litter_super(sb);
pstore_sb = NULL;
+
+ mutex_lock(&records_list_lock);
+ INIT_LIST_HEAD(&records_list);
+ mutex_unlock(&records_list_lock);
+
+ mutex_unlock(&pstore_sb_lock);
}
static struct file_system_type pstore_fs_type = {
--
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