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Big part of this is the addition of compression to the

Browse source 
generic pstore layer so that all backends can use the
 pitiful amounts of storage they control more effectively.
 Three other small fixes/cleanups too.
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Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull pstore changes from Tony Luck:
 "A big part of this is the addition of compression to the generic
  pstore layer so that all backends can use the pitiful amounts of
  storage they control more effectively.  Three other small
  fixes/cleanups too.

* tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  pstore/ram: (really) fix undefined usage of rounddown_pow_of_two
  pstore/ram: Read and write to the 'compressed' flag of pstore
  efi-pstore: Read and write to the 'compressed' flag of pstore
  erst: Read and write to the 'compressed' flag of pstore
  powerpc/pseries: Read and write to the 'compressed' flag of pstore
  pstore: Add file extension to pstore file if compressed
  pstore: Add decompression support to pstore
  pstore: Introduce new argument 'compressed' in the read callback
  pstore: Add compression support to pstore
  pstore/Kconfig: Select ZLIB_DEFLATE and ZLIB_INFLATE when PSTORE is selected
  pstore: Add new argument 'compressed' in pstore write callback
  powerpc/pseries: Remove (de)compression in nvram with pstore enabled
  pstore: d_alloc_name() doesn't return an ERR_PTR
  acpi/apei/erst: Add missing iounmap() on error in erst_exec_move_data()
This commit is contained in:
Linus Torvalds 2013-09-03 21:14:06 -07:00
commit f83b0a4e4c
9 changed files with 306 additions and 140 deletions
Download patch file Download diff file Expand all files Collapse all files

27
drivers/firmware/efi/efi-pstore.c
View file

@ -35,6 +35,7 @@ struct pstore_read_data {
enum pstore_type_id *type;
int *count;
struct timespec *timespec;
bool *compressed;
char **buf;
};
@ -42,7 +43,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
{
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
struct pstore_read_data *cb_data = data;
char name[DUMP_NAME_LEN];
char name[DUMP_NAME_LEN], data_type;
int i;
int cnt;
unsigned int part;
@ -54,12 +55,23 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
for (i = 0; i < DUMP_NAME_LEN; i++)
name[i] = entry->var.VariableName[i];
if (sscanf(name, "dump-type%u-%u-%d-%lu",
if (sscanf(name, "dump-type%u-%u-%d-%lu-%c",
cb_data->type, &part, &cnt, &time, &data_type) == 5) {
*cb_data->id = part;
*cb_data->count = cnt;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
if (data_type == 'C')
*cb_data->compressed = true;
else
*cb_data->compressed = false;
} else if (sscanf(name, "dump-type%u-%u-%d-%lu",
cb_data->type, &part, &cnt, &time) == 4) {
*cb_data->id = part;
*cb_data->count = cnt;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
*cb_data->compressed = false;
} else if (sscanf(name, "dump-type%u-%u-%lu",
cb_data->type, &part, &time) == 3) {
/*
@ -71,6 +83,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
*cb_data->count = 0;
cb_data->timespec->tv_sec = time;
cb_data->timespec->tv_nsec = 0;
*cb_data->compressed = false;
} else
return 0;
@ -87,7 +100,8 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *timespec,
char **buf, struct pstore_info *psi)
char **buf, bool *compressed,
struct pstore_info *psi)
{
struct pstore_read_data data;
@ -95,6 +109,7 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
data.type = type;
data.count = count;
data.timespec = timespec;
data.compressed = compressed;
data.buf = buf;
return __efivar_entry_iter(efi_pstore_read_func, &efivar_sysfs_list, &data,
@ -103,7 +118,7 @@ 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, int count, size_t hsize, size_t size,
unsigned int part, int count, bool compressed, size_t size,
struct pstore_info *psi)
{
char name[DUMP_NAME_LEN];
@ -111,8 +126,8 @@ static int efi_pstore_write(enum pstore_type_id type,
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
int i, ret = 0;
sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
get_seconds());
sprintf(name, "dump-type%u-%u-%d-%lu-%c", type, part, count,
get_seconds(), compressed ? 'C' : 'D');
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];