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Miscellaneous pstore improvements

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Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull pstore updates from Tony Luck:
 "Miscellaneous pstore improvements"

* tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  ramoops: make it possible to change mem_type param.
  pstore/ram: verify ramoops header before saving record
  fs/pstore: Optimization function ramoops_init_przs
  fs/pstore: update the backend parameter in pstore module
  pstore: do not use message compression without lock
This commit is contained in:
Linus Torvalds 2015-06-24 20:42:21 -07:00
commit 266da6f142
2 changed files with 39 additions and 19 deletions
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8
fs/pstore/platform.c
View File

@ -299,7 +299,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
bool compressed; bool compressed;
size_t total_len; size_t total_len;
if (big_oops_buf) { if (big_oops_buf && is_locked) {
dst = big_oops_buf; dst = big_oops_buf;
hsize = sprintf(dst, "%s#%d Part%u\n", why, hsize = sprintf(dst, "%s#%d Part%u\n", why,
oopscount, part); oopscount, part);
@ -456,6 +456,12 @@ int pstore_register(struct pstore_info *psi)
add_timer(&pstore_timer); add_timer(&pstore_timer);
} }
/*
* Update the module parameter backend, so it is visible
* through /sys/module/pstore/parameters/backend
*/
backend = psi->name;
pr_info("Registered %s as persistent store backend\n", psi->name); pr_info("Registered %s as persistent store backend\n", psi->name);
return 0; return 0;

50
fs/pstore/ram.c
View File

@ -186,12 +186,34 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
ssize_t size; ssize_t size;
ssize_t ecc_notice_size; ssize_t ecc_notice_size;
struct ramoops_context *cxt = psi->data; struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz; struct persistent_ram_zone *prz = NULL;
int header_length; int header_length = 0;
/* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
* PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
* valid time stamps, so it is initialized to zero.
*/
time->tv_sec = 0;
time->tv_nsec = 0;
*compressed = false;
/* Find the next valid persistent_ram_zone for DMESG */
while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz))
continue;
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
time, compressed);
/* Clear and skip this DMESG record if it has no valid header */
if (!header_length) {
persistent_ram_free_old(prz);
persistent_ram_zap(prz);
prz = NULL;
}
}
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz)) if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0); 1, id, type, PSTORE_TYPE_CONSOLE, 0);
@ -204,13 +226,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
if (!prz_ok(prz)) if (!prz_ok(prz))
return 0; return 0;
if (!persistent_ram_old(prz)) size = persistent_ram_old_size(prz) - header_length;
return 0;
size = persistent_ram_old_size(prz);
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), time,
compressed);
size -= header_length;
/* ECC correction notice */ /* ECC correction notice */
ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
@ -394,18 +410,16 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
} }
for (i = 0; i < cxt->max_dump_cnt; i++) { for (i = 0; i < cxt->max_dump_cnt; i++) {
size_t sz = cxt->record_size; cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
&cxt->ecc_info, &cxt->ecc_info,
cxt->memtype); cxt->memtype);
if (IS_ERR(cxt->przs[i])) { if (IS_ERR(cxt->przs[i])) {
err = PTR_ERR(cxt->przs[i]); err = PTR_ERR(cxt->przs[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
sz, (unsigned long long)*paddr, err); cxt->record_size, (unsigned long long)*paddr, err);
goto fail_prz; goto fail_prz;
} }
*paddr += sz; *paddr += cxt->record_size;
} }
return 0; return 0;
@ -608,7 +622,7 @@ static void ramoops_register_dummy(void)
dummy_data->mem_size = mem_size; dummy_data->mem_size = mem_size;
dummy_data->mem_address = mem_address; dummy_data->mem_address = mem_address;
dummy_data->mem_type = 0; dummy_data->mem_type = mem_type;
dummy_data->record_size = record_size; dummy_data->record_size = record_size;
dummy_data->console_size = ramoops_console_size; dummy_data->console_size = ramoops_console_size;
dummy_data->ftrace_size = ramoops_ftrace_size; dummy_data->ftrace_size = ramoops_ftrace_size;