big_oops_buf_sz = 0;
}
-static struct pstore_zbackend backend_zlib = {
+static const struct pstore_zbackend backend_zlib = {
.compress = compress_zlib,
.decompress = decompress_zlib,
.allocate = allocate_zlib,
big_oops_buf_sz = 0;
}
-static struct pstore_zbackend backend_lzo = {
+static const struct pstore_zbackend backend_lzo = {
.compress = compress_lzo,
.decompress = decompress_lzo,
.allocate = allocate_lzo,
big_oops_buf_sz = 0;
}
-static struct pstore_zbackend backend_lz4 = {
+static const struct pstore_zbackend backend_lz4 = {
.compress = compress_lz4,
.decompress = decompress_lz4,
.allocate = allocate_lz4,
};
#endif
-static struct pstore_zbackend *zbackend =
+static const struct pstore_zbackend *zbackend =
#if defined(CONFIG_PSTORE_ZLIB_COMPRESS)
&backend_zlib;
#elif defined(CONFIG_PSTORE_LZO_COMPRESS)
{
unsigned long total = 0;
const char *why;
- u64 id;
unsigned int part = 1;
unsigned long flags = 0;
int is_locked;
oopscount++;
while (total < kmsg_bytes) {
char *dst;
- unsigned long size;
- int hsize;
+ size_t dst_size;
+ int header_size;
int zipped_len = -1;
- size_t len;
- bool compressed = false;
- size_t total_len;
+ size_t dump_size;
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_DMESG,
+ .count = oopscount,
+ .reason = reason,
+ .part = part,
+ .compressed = false,
+ .buf = psinfo->buf,
+ .psi = psinfo,
+ };
if (big_oops_buf && is_locked) {
dst = big_oops_buf;
- size = big_oops_buf_sz;
+ dst_size = big_oops_buf_sz;
} else {
dst = psinfo->buf;
- size = psinfo->bufsize;
+ dst_size = psinfo->bufsize;
}
- hsize = sprintf(dst, "%s#%d Part%u\n", why, oopscount, part);
- size -= hsize;
+ /* Write dump header. */
+ header_size = snprintf(dst, dst_size, "%s#%d Part%u\n", why,
+ oopscount, part);
+ dst_size -= header_size;
- if (!kmsg_dump_get_buffer(dumper, true, dst + hsize,
- size, &len))
+ /* Write dump contents. */
+ if (!kmsg_dump_get_buffer(dumper, true, dst + header_size,
+ dst_size, &dump_size))
break;
if (big_oops_buf && is_locked) {
zipped_len = pstore_compress(dst, psinfo->buf,
- hsize + len, psinfo->bufsize);
+ header_size + dump_size,
+ psinfo->bufsize);
if (zipped_len > 0) {
- compressed = true;
- total_len = zipped_len;
+ record.compressed = true;
+ record.size = zipped_len;
} else {
- total_len = copy_kmsg_to_buffer(hsize, len);
+ record.size = copy_kmsg_to_buffer(header_size,
+ dump_size);
}
} else {
- total_len = hsize + len;
+ record.size = header_size + dump_size;
}
- ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
- oopscount, compressed, total_len, psinfo);
+ ret = psinfo->write(&record);
if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_new_entry = 1;
- total += total_len;
+ total += record.size;
part++;
}
if (is_locked)
static void pstore_unregister_console(void) {}
#endif
-static int pstore_write_compat(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part, int count,
- bool compressed, size_t size,
- struct pstore_info *psi)
+static int pstore_write_compat(struct pstore_record *record)
{
- return psi->write_buf(type, reason, id, part, psinfo->buf, compressed,
- size, psi);
+ return record->psi->write_buf(record->type, record->reason,
+ &record->id, record->part,
+ psinfo->buf, record->compressed,
+ record->size, record->psi);
}
static int pstore_write_buf_user_compat(enum pstore_type_id type,
{
struct module *owner = psi->owner;
- if (backend && strcmp(backend, psi->name))
+ if (backend && strcmp(backend, psi->name)) {
+ pr_warn("ignoring unexpected backend '%s'\n", psi->name);
return -EPERM;
+ }
spin_lock(&pstore_lock);
if (psinfo) {
+ pr_warn("backend '%s' already loaded: ignoring '%s'\n",
+ psinfo->name, psi->name);
spin_unlock(&pstore_lock);
return -EBUSY;
}
if (psi->flags & PSTORE_FLAGS_PMSG)
pstore_register_pmsg();
+ /* Start watching for new records, if desired. */
if (pstore_update_ms >= 0) {
pstore_timer.expires = jiffies +
msecs_to_jiffies(pstore_update_ms);
*/
backend = psi->name;
- module_put(owner);
-
pr_info("Registered %s as persistent store backend\n", psi->name);
+ module_put(owner);
+
return 0;
}
EXPORT_SYMBOL_GPL(pstore_register);
void pstore_unregister(struct pstore_info *psi)
{
+ /* Stop timer and make sure all work has finished. */
+ pstore_update_ms = -1;
+ del_timer_sync(&pstore_timer);
+ flush_work(&pstore_work);
+
if (psi->flags & PSTORE_FLAGS_PMSG)
pstore_unregister_pmsg();
if (psi->flags & PSTORE_FLAGS_FTRACE)
}
EXPORT_SYMBOL_GPL(pstore_unregister);
+static void decompress_record(struct pstore_record *record)
+{
+ int unzipped_len;
+ char *decompressed;
+
+ /* Only PSTORE_TYPE_DMESG support compression. */
+ if (!record->compressed || record->type != PSTORE_TYPE_DMESG) {
+ pr_warn("ignored compressed record type %d\n", record->type);
+ return;
+ }
+
+ /* No compression method has created the common buffer. */
+ if (!big_oops_buf) {
+ pr_warn("no decompression buffer allocated\n");
+ return;
+ }
+
+ unzipped_len = pstore_decompress(record->buf, big_oops_buf,
+ record->size, big_oops_buf_sz);
+ if (unzipped_len <= 0) {
+ pr_err("decompression failed: %d\n", unzipped_len);
+ return;
+ }
+
+ /* Build new buffer for decompressed contents. */
+ decompressed = kmalloc(unzipped_len + record->ecc_notice_size,
+ GFP_KERNEL);
+ if (!decompressed) {
+ pr_err("decompression ran out of memory\n");
+ return;
+ }
+ memcpy(decompressed, big_oops_buf, unzipped_len);
+
+ /* Append ECC notice to decompressed buffer. */
+ memcpy(decompressed + unzipped_len, record->buf + record->size,
+ record->ecc_notice_size);
+
+ /* Swap out compresed contents with decompressed contents. */
+ kfree(record->buf);
+ record->buf = decompressed;
+ record->size = unzipped_len;
+ record->compressed = false;
+}
+
/*
* Read all the records from the persistent store. Create
* files in our filesystem. Don't warn about -EEXIST errors
void pstore_get_records(int quiet)
{
struct pstore_info *psi = psinfo;
- char *buf = NULL;
- ssize_t size;
- u64 id;
- int count;
- enum pstore_type_id type;
- struct timespec time;
- int failed = 0, rc;
- bool compressed;
- int unzipped_len = -1;
- ssize_t ecc_notice_size = 0;
+ int failed = 0;
if (!psi)
return;
if (psi->open && psi->open(psi))
goto out;
- while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed,
- &ecc_notice_size, psi)) > 0) {
- if (compressed && (type == PSTORE_TYPE_DMESG)) {
- if (big_oops_buf)
- unzipped_len = pstore_decompress(buf,
- big_oops_buf, size,
- big_oops_buf_sz);
-
- if (unzipped_len > 0) {
- if (ecc_notice_size)
- memcpy(big_oops_buf + unzipped_len,
- buf + size, ecc_notice_size);
- kfree(buf);
- buf = big_oops_buf;
- size = unzipped_len;
- compressed = false;
- } else {
- pr_err("decompression failed;returned %d\n",
- unzipped_len);
- compressed = true;
- }
+ /*
+ * Backend callback read() allocates record.buf. decompress_record()
+ * may reallocate record.buf. On success, pstore_mkfile() will keep
+ * the record.buf, so free it only on failure.
+ */
+ for (;;) {
+ struct pstore_record *record;
+ int rc;
+
+ record = kzalloc(sizeof(*record), GFP_KERNEL);
+ if (!record) {
+ pr_err("out of memory creating record\n");
+ break;
}
- rc = pstore_mkfile(type, psi->name, id, count, buf,
- compressed, size + ecc_notice_size,
- time, psi);
- if (unzipped_len < 0) {
- /* Free buffer other than big oops */
- kfree(buf);
- buf = NULL;
- } else
- unzipped_len = -1;
- if (rc && (rc != -EEXIST || !quiet))
- failed++;
+ record->psi = psi;
+
+ record->size = psi->read(record);
+
+ /* No more records left in backend? */
+ if (record->size <= 0)
+ break;
+
+ decompress_record(record);
+ rc = pstore_mkfile(record);
+ if (rc) {
+ /* pstore_mkfile() did not take buf, so free it. */
+ kfree(record->buf);
+ if (rc != -EEXIST || !quiet)
+ failed++;
+ }
+
+ /* Reset for next record. */
+ kfree(record);
}
if (psi->close)
psi->close(psi);
schedule_work(&pstore_work);
}
- mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms));
+ if (pstore_update_ms >= 0)
+ mod_timer(&pstore_timer,
+ jiffies + msecs_to_jiffies(pstore_update_ms));
}
module_param(backend, charp, 0444);
projects / linux-block.git / blobdiff