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pstore: fix pstore filesystem mount/remount issue

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Currently after mount/remount operation on pstore filesystem,
the content on pstore will be lost. It is because current ERST
implementation doesn't support multi-user usage, which moves
internal pointer to the end after accessing it. Adding
multi-user support for pstore usage.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Chen Gong 2011-05-16 11:00:27 -07:00 committed by Tony Luck
parent 8d38d74b64
commit 06cf91b4b4
3 changed files with 44 additions and 14 deletions
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48
drivers/acpi/apei/erst.c
View File

@ -929,6 +929,8 @@ static int erst_check_table(struct acpi_table_erst *erst_tab)
return 0;
}
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,
struct timespec *time);
static u64 erst_writer(enum pstore_type_id type, size_t size);
@ -936,6 +938,8 @@ static u64 erst_writer(enum pstore_type_id type, size_t size);
static struct pstore_info erst_info = {
.owner = THIS_MODULE,
.name = "erst",
.open = erst_open_pstore,
.close = erst_close_pstore,
.read = erst_reader,
.write = erst_writer,
.erase = erst_clear
@ -957,12 +961,32 @@ struct cper_pstore_record {
char data[];
} __packed;
static int reader_pos;
static int erst_open_pstore(struct pstore_info *psi)
{
int rc;
if (erst_disable)
return -ENODEV;
rc = erst_get_record_id_begin(&reader_pos);
return rc;
}
static int erst_close_pstore(struct pstore_info *psi)
{
erst_get_record_id_end();
return 0;
}
static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
struct timespec *time)
{
int rc;
ssize_t len;
unsigned long flags;
ssize_t len = 0;
u64 record_id;
struct cper_pstore_record *rcd = (struct cper_pstore_record *)
(erst_info.buf - sizeof(*rcd));
@ -970,24 +994,21 @@ static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
if (erst_disable)
return -ENODEV;
raw_spin_lock_irqsave(&erst_lock, flags);
skip:
rc = __erst_get_next_record_id(&record_id);
if (rc) {
raw_spin_unlock_irqrestore(&erst_lock, flags);
return rc;
}
rc = erst_get_record_id_next(&reader_pos, &record_id);
if (rc)
goto out;
/* no more record */
if (record_id == APEI_ERST_INVALID_RECORD_ID) {
raw_spin_unlock_irqrestore(&erst_lock, flags);
return 0;
rc = -1;
goto out;
}
len = __erst_read(record_id, &rcd->hdr, sizeof(*rcd) +
len = erst_read(record_id, &rcd->hdr, sizeof(*rcd) +
erst_erange.size);
if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0)
goto skip;
raw_spin_unlock_irqrestore(&erst_lock, flags);
*id = record_id;
if (uuid_le_cmp(rcd->sec_hdr.section_type,
@ -1005,7 +1026,8 @@ static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
time->tv_sec = 0;
time->tv_nsec = 0;
return len - sizeof(*rcd);
out:
return (rc < 0) ? rc : (len - sizeof(*rcd));
}
static u64 erst_writer(enum pstore_type_id type, size_t size)

8
fs/pstore/platform.c
View File

@ -156,17 +156,23 @@ void pstore_get_records(void)
u64 id;
enum pstore_type_id type;
struct timespec time;
int failed = 0;
int failed = 0, rc;
if (!psi)
return;
mutex_lock(&psinfo->buf_mutex);
rc = psi->open(psi);
if (rc)
goto out;
while ((size = psi->read(&id, &type, &time)) > 0) {
if (pstore_mkfile(type, psi->name, id, psi->buf, (size_t)size,
time, psi->erase))
failed++;
}
psi->close(psi);
out:
mutex_unlock(&psinfo->buf_mutex);
if (failed)

2
include/linux/pstore.h
View File

@ -35,6 +35,8 @@ struct pstore_info {
struct mutex buf_mutex; /* serialize access to 'buf' */
char *buf;
size_t bufsize;
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);
u64 (*write)(enum pstore_type_id type, size_t size);