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Patch series to allow EFI variable backend to pstore 

to hold multiple records.
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Merge tag 'please-pull-pstore_mevent' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull pstore fixes from Tony Luck:
 "Patch series to allow EFI variable backend to pstore to hold multiple
  records."

* tag 'please-pull-pstore_mevent' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  efi_pstore: Add a format check for an existing variable name at erasing time
  efi_pstore: Add a format check for an existing variable name at reading time
  efi_pstore: Add a sequence counter to a variable name
  efi_pstore: Add ctime to argument of erase callback
  efi_pstore: Remove a logic erasing entries from a write callback to hold multiple logs
  efi_pstore: Add a logic erasing entries to an erase callback
  efi_pstore: Check remaining space with QueryVariableInfo() before writing data
This commit is contained in:
Linus Torvalds 2012-12-12 07:50:59 -08:00
parent 70f2836d02 f94ec0c059
commit 251a8cfeda
8 changed files with 148 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/acpi/apei/erst.c
View File

@ -931,14 +931,14 @@ static int erst_check_table(struct acpi_table_erst *erst_tab)
static int erst_open_pstore(struct pstore_info *psi);
static int erst_close_pstore(struct pstore_info *psi);
static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,
struct timespec *time, char **buf,
struct pstore_info *psi);
static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
u64 *id, unsigned int part, int count,
size_t size, struct pstore_info *psi);
static int erst_clearer(enum pstore_type_id type, u64 id,
struct pstore_info *psi);
static int erst_clearer(enum pstore_type_id type, u64 id, int count,
struct timespec time, struct pstore_info *psi);
static struct pstore_info erst_info = {
.owner = THIS_MODULE,
@ -987,7 +987,7 @@ static int erst_close_pstore(struct pstore_info *psi)
return 0;
}
static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,
struct timespec *time, char **buf,
struct pstore_info *psi)
{
@ -1055,7 +1055,7 @@ static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
}
static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
u64 *id, unsigned int part, int count,
size_t size, struct pstore_info *psi)
{
struct cper_pstore_record *rcd = (struct cper_pstore_record *)
@ -1101,8 +1101,8 @@ static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,
return ret;
}
static int erst_clearer(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
static int erst_clearer(enum pstore_type_id type, u64 id, int count,
struct timespec time, struct pstore_info *psi)
{
return erst_clear(id);
}

171
drivers/firmware/efivars.c
View File

@ -658,13 +658,14 @@ static int efi_pstore_close(struct pstore_info *psi)
}
static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
struct timespec *timespec,
int *count, struct timespec *timespec,
char **buf, struct pstore_info *psi)
{
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
struct efivars *efivars = psi->data;
char name[DUMP_NAME_LEN];
int i;
int cnt;
unsigned int part, size;
unsigned long time;
@ -674,21 +675,41 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
for (i = 0; i < DUMP_NAME_LEN; i++) {
name[i] = efivars->walk_entry->var.VariableName[i];
}
if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) {
if (sscanf(name, "dump-type%u-%u-%d-%lu",
type, &part, &cnt, &time) == 4) {
*id = part;
*count = cnt;
timespec->tv_sec = time;
timespec->tv_nsec = 0;
get_var_data_locked(efivars, &efivars->walk_entry->var);
size = efivars->walk_entry->var.DataSize;
*buf = kmalloc(size, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, efivars->walk_entry->var.Data,
size);
efivars->walk_entry = list_entry(efivars->walk_entry->list.next,
struct efivar_entry, list);
return size;
} else if (sscanf(name, "dump-type%u-%u-%lu",
type, &part, &time) == 3) {
/*
* Check if an old format,
* which doesn't support holding
* multiple logs, remains.
*/
*id = part;
*count = 0;
timespec->tv_sec = time;
timespec->tv_nsec = 0;
} else {
efivars->walk_entry = list_entry(
efivars->walk_entry->list.next,
struct efivar_entry, list);
continue;
}
get_var_data_locked(efivars, &efivars->walk_entry->var);
size = efivars->walk_entry->var.DataSize;
*buf = kmalloc(size, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, efivars->walk_entry->var.Data,
size);
efivars->walk_entry = list_entry(
efivars->walk_entry->list.next,
struct efivar_entry, list);
return size;
}
efivars->walk_entry = list_entry(efivars->walk_entry->list.next,
struct efivar_entry, list);
@ -698,50 +719,36 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
static int efi_pstore_write(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi)
unsigned int part, int count, size_t size,
struct pstore_info *psi)
{
char name[DUMP_NAME_LEN];
char stub_name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
struct efivars *efivars = psi->data;
struct efivar_entry *entry, *found = NULL;
int i, ret = 0;
sprintf(stub_name, "dump-type%u-%u-", type, part);
sprintf(name, "%s%lu", stub_name, get_seconds());
u64 storage_space, remaining_space, max_variable_size;
efi_status_t status = EFI_NOT_FOUND;
spin_lock(&efivars->lock);
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = stub_name[i];
/*
* Clean up any entries with the same name
* Check if there is a space enough to log.
* size: a size of logging data
* DUMP_NAME_LEN * 2: a maximum size of variable name
*/
list_for_each_entry(entry, &efivars->list, list) {
get_var_data_locked(efivars, &entry->var);
if (efi_guidcmp(entry->var.VendorGuid, vendor))
continue;
if (utf16_strncmp(entry->var.VariableName, efi_name,
utf16_strlen(efi_name)))
continue;
/* Needs to be a prefix */
if (entry->var.VariableName[utf16_strlen(efi_name)] == 0)
continue;
/* found */
found = entry;
efivars->ops->set_variable(entry->var.VariableName,
&entry->var.VendorGuid,
PSTORE_EFI_ATTRIBUTES,
0, NULL);
status = efivars->ops->query_variable_info(PSTORE_EFI_ATTRIBUTES,
&storage_space,
&remaining_space,
&max_variable_size);
if (status || remaining_space < size + DUMP_NAME_LEN * 2) {
spin_unlock(&efivars->lock);
*id = part;
return -ENOSPC;
}
if (found)
list_del(&found->list);
sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
get_seconds());
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
@ -751,9 +758,6 @@ static int efi_pstore_write(enum pstore_type_id type,
spin_unlock(&efivars->lock);
if (found)
efivar_unregister(found);
if (size)
ret = efivar_create_sysfs_entry(efivars,
utf16_strsize(efi_name,
@ -764,10 +768,69 @@ static int efi_pstore_write(enum pstore_type_id type,
return ret;
};
static int efi_pstore_erase(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
struct timespec time, struct pstore_info *psi)
{
efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi);
char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
char name_old[DUMP_NAME_LEN];
efi_char16_t efi_name_old[DUMP_NAME_LEN];
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
struct efivars *efivars = psi->data;
struct efivar_entry *entry, *found = NULL;
int i;
sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,
time.tv_sec);
spin_lock(&efivars->lock);
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
/*
* Clean up an entry with the same name
*/
list_for_each_entry(entry, &efivars->list, list) {
get_var_data_locked(efivars, &entry->var);
if (efi_guidcmp(entry->var.VendorGuid, vendor))
continue;
if (utf16_strncmp(entry->var.VariableName, efi_name,
utf16_strlen(efi_name))) {
/*
* Check if an old format,
* which doesn't support holding
* multiple logs, remains.
*/
sprintf(name_old, "dump-type%u-%u-%lu", type,
(unsigned int)id, time.tv_sec);
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name_old[i] = name_old[i];
if (utf16_strncmp(entry->var.VariableName, efi_name_old,
utf16_strlen(efi_name_old)))
continue;
}
/* found */
found = entry;
efivars->ops->set_variable(entry->var.VariableName,
&entry->var.VendorGuid,
PSTORE_EFI_ATTRIBUTES,
0, NULL);
break;
}
if (found)
list_del(&found->list);
spin_unlock(&efivars->lock);
if (found)
efivar_unregister(found);
return 0;
}
@ -782,7 +845,7 @@ static int efi_pstore_close(struct pstore_info *psi)
return 0;
}
static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, int *count,
struct timespec *timespec,
char **buf, struct pstore_info *psi)
{
@ -791,13 +854,14 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
static int efi_pstore_write(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi)
unsigned int part, int count, size_t size,
struct pstore_info *psi)
{
return 0;
}
static int efi_pstore_erase(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
struct timespec time, struct pstore_info *psi)
{
return 0;
}
@ -1237,6 +1301,7 @@ efivars_init(void)
ops.get_variable = efi.get_variable;
ops.set_variable = efi.set_variable;
ops.get_next_variable = efi.get_next_variable;
ops.query_variable_info = efi.query_variable_info;
error = register_efivars(&__efivars, &ops, efi_kobj);
if (error)
goto err_put;

7
fs/pstore/inode.c
View File

@ -49,6 +49,7 @@ struct pstore_private {
struct pstore_info *psi;
enum pstore_type_id type;
u64 id;
int count;
ssize_t size;
char data[];
};
@ -175,7 +176,8 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry)
struct pstore_private *p = dentry->d_inode->i_private;
if (p->psi->erase)
p->psi->erase(p->type, p->id, p->psi);
p->psi->erase(p->type, p->id, p->count,
dentry->d_inode->i_ctime, p->psi);
return simple_unlink(dir, dentry);
}
@ -270,7 +272,7 @@ int pstore_is_mounted(void)
* Load it up with "size" bytes of data from "buf".
* Set the mtime & ctime to the date that this record was originally stored.
*/
int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
char *data, size_t size, struct timespec time,
struct pstore_info *psi)
{
@ -306,6 +308,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
goto fail_alloc;
private->type = type;
private->id = id;
private->count = count;
private->psi = psi;
switch (type) {

2
fs/pstore/internal.h
View File

@ -50,7 +50,7 @@ extern struct pstore_info *psinfo;
extern void pstore_set_kmsg_bytes(int);
extern void pstore_get_records(int);
extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
char *data, size_t size,
int count, char *data, size_t size,
struct timespec time, struct pstore_info *psi);
extern int pstore_is_mounted(void);

13
fs/pstore/platform.c
View File

@ -136,7 +136,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
break;
ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
hsize + len, psinfo);
oopscount, hsize + len, psinfo);
if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_new_entry = 1;
@ -173,7 +173,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
spin_lock_irqsave(&psinfo->buf_lock, flags);
}
memcpy(psinfo->buf, s, c);
psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, c, psinfo);
psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, c, psinfo);
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
s += c;
c = e - s;
@ -197,7 +197,7 @@ static void pstore_register_console(void) {}
static int pstore_write_compat(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
u64 *id, unsigned int part, int count,
size_t size, struct pstore_info *psi)
{
return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi);
@ -267,6 +267,7 @@ void pstore_get_records(int quiet)
char *buf = NULL;
ssize_t size;
u64 id;
int count;
enum pstore_type_id type;
struct timespec time;
int failed = 0, rc;
@ -278,9 +279,9 @@ void pstore_get_records(int quiet)
if (psi->open && psi->open(psi))
goto out;
while ((size = psi->read(&id, &type, &time, &buf, psi)) > 0) {
rc = pstore_mkfile(type, psi->name, id, buf, (size_t)size,
time, psi);
while ((size = psi->read(&id, &type, &count, &time, &buf, psi)) > 0) {
rc = pstore_mkfile(type, psi->name, id, count, buf,
(size_t)size, time, psi);
kfree(buf);
buf = NULL;
if (rc && (rc != -EEXIST || !quiet))

9
fs/pstore/ram.c
View File

@ -132,9 +132,8 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
}
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
struct timespec *time,
char **buf,
struct pstore_info *psi)
int *count, struct timespec *time,
char **buf, struct pstore_info *psi)
{
ssize_t size;
struct ramoops_context *cxt = psi->data;
@ -236,8 +235,8 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
return 0;
}
static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
struct timespec time, struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;

1
include/linux/efi.h
View File

@ -643,6 +643,7 @@ struct efivar_operations {
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
efi_query_variable_info_t *query_variable_info;
};
struct efivars {

6
include/linux/pstore.h
View File

@ -50,16 +50,18 @@ struct pstore_info {
int (*open)(struct pstore_info *psi);
int (*close)(struct pstore_info *psi);
ssize_t (*read)(u64 *id, enum pstore_type_id *type,
struct timespec *time, char **buf,
int *count, struct timespec *time, char **buf,
struct pstore_info *psi);
int (*write)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi);
unsigned int part, int count, size_t size,
struct pstore_info *psi);
int (*write_buf)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, const char *buf, size_t size,
struct pstore_info *psi);
int (*erase)(enum pstore_type_id type, u64 id,
int count, struct timespec time,
struct pstore_info *psi);
void *data;
};