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-rw-r--r--fs/pstore/platform.c206
1 files changed, 19 insertions, 187 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index cbc0b468c1ab..13fd1a297846 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -16,15 +16,6 @@
#include <linux/console.h>
#include <linux/module.h>
#include <linux/pstore.h>
-#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
-#include <linux/lzo.h>
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
-#include <linux/lz4.h>
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)
-#include <linux/zstd.h>
-#endif
#include <linux/crypto.h>
#include <linux/string.h>
#include <linux/timer.h>
@@ -97,13 +88,7 @@ MODULE_PARM_DESC(kmsg_bytes, "amount of kernel log to snapshot (in bytes)");
/* Compression parameters */
static struct crypto_comp *tfm;
-struct pstore_zbackend {
- int (*zbufsize)(size_t size);
- const char *name;
-};
-
static char *big_oops_buf;
-static size_t big_oops_buf_sz;
void pstore_set_kmsg_bytes(int bytes)
{
@@ -168,105 +153,6 @@ static bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
}
}
-#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
-static int zbufsize_deflate(size_t size)
-{
- size_t cmpr;
-
- switch (size) {
- /* buffer range for efivars */
- case 1000 ... 2000:
- cmpr = 56;
- break;
- case 2001 ... 3000:
- cmpr = 54;
- break;
- case 3001 ... 3999:
- cmpr = 52;
- break;
- /* buffer range for nvram, erst */
- case 4000 ... 10000:
- cmpr = 45;
- break;
- default:
- cmpr = 60;
- break;
- }
-
- return (size * 100) / cmpr;
-}
-#endif
-
-#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
-static int zbufsize_lzo(size_t size)
-{
- return lzo1x_worst_compress(size);
-}
-#endif
-
-#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
-static int zbufsize_lz4(size_t size)
-{
- return LZ4_compressBound(size);
-}
-#endif
-
-#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
-static int zbufsize_842(size_t size)
-{
- return size;
-}
-#endif
-
-#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)
-static int zbufsize_zstd(size_t size)
-{
- return zstd_compress_bound(size);
-}
-#endif
-
-static const struct pstore_zbackend *zbackend __ro_after_init;
-
-static const struct pstore_zbackend zbackends[] = {
-#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
- {
- .zbufsize = zbufsize_deflate,
- .name = "deflate",
- },
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
- {
- .zbufsize = zbufsize_lzo,
- .name = "lzo",
- },
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS)
- {
- .zbufsize = zbufsize_lz4,
- .name = "lz4",
- },
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
- {
- .zbufsize = zbufsize_lz4,
- .name = "lz4hc",
- },
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
- {
- .zbufsize = zbufsize_842,
- .name = "842",
- },
-#endif
-#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)
- {
- .zbufsize = zbufsize_zstd,
- .name = "zstd",
- },
-#endif
- { }
-};
-
static int pstore_compress(const void *in, void *out,
unsigned int inlen, unsigned int outlen)
{
@@ -287,50 +173,46 @@ static int pstore_compress(const void *in, void *out,
static void allocate_buf_for_compression(void)
{
struct crypto_comp *ctx;
- int size;
char *buf;
/* Skip if not built-in or compression backend not selected yet. */
- if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS) || !zbackend)
+ if (!IS_ENABLED(CONFIG_PSTORE_COMPRESS) || !compress)
return;
/* Skip if no pstore backend yet or compression init already done. */
if (!psinfo || tfm)
return;
- if (!crypto_has_comp(zbackend->name, 0, 0)) {
- pr_err("Unknown compression: %s\n", zbackend->name);
- return;
- }
-
- size = zbackend->zbufsize(psinfo->bufsize);
- if (size <= 0) {
- pr_err("Invalid compression size for %s: %d\n",
- zbackend->name, size);
+ if (!crypto_has_comp(compress, 0, 0)) {
+ pr_err("Unknown compression: %s\n", compress);
return;
}
- buf = kmalloc(size, GFP_KERNEL);
+ /*
+ * The compression buffer only needs to be as large as the maximum
+ * uncompressed record size, since any record that would be expanded by
+ * compression is just stored uncompressed.
+ */
+ buf = kmalloc(psinfo->bufsize, GFP_KERNEL);
if (!buf) {
- pr_err("Failed %d byte compression buffer allocation for: %s\n",
- size, zbackend->name);
+ pr_err("Failed %zu byte compression buffer allocation for: %s\n",
+ psinfo->bufsize, compress);
return;
}
- ctx = crypto_alloc_comp(zbackend->name, 0, 0);
+ ctx = crypto_alloc_comp(compress, 0, 0);
if (IS_ERR_OR_NULL(ctx)) {
kfree(buf);
- pr_err("crypto_alloc_comp('%s') failed: %ld\n", zbackend->name,
+ pr_err("crypto_alloc_comp('%s') failed: %ld\n", compress,
PTR_ERR(ctx));
return;
}
/* A non-NULL big_oops_buf indicates compression is available. */
tfm = ctx;
- big_oops_buf_sz = size;
big_oops_buf = buf;
- pr_info("Using crash dump compression: %s\n", zbackend->name);
+ pr_info("Using crash dump compression: %s\n", compress);
}
static void free_buf_for_compression(void)
@@ -341,33 +223,6 @@ static void free_buf_for_compression(void)
}
kfree(big_oops_buf);
big_oops_buf = NULL;
- big_oops_buf_sz = 0;
-}
-
-/*
- * Called when compression fails, since the printk buffer
- * would be fetched for compression calling it again when
- * compression fails would have moved the iterator of
- * printk buffer which results in fetching old contents.
- * Copy the recent messages from big_oops_buf to psinfo->buf
- */
-static size_t copy_kmsg_to_buffer(int hsize, size_t len)
-{
- size_t total_len;
- size_t diff;
-
- total_len = hsize + len;
-
- if (total_len > psinfo->bufsize) {
- diff = total_len - psinfo->bufsize + hsize;
- memcpy(psinfo->buf, big_oops_buf, hsize);
- memcpy(psinfo->buf + hsize, big_oops_buf + diff,
- psinfo->bufsize - hsize);
- total_len = psinfo->bufsize;
- } else
- memcpy(psinfo->buf, big_oops_buf, total_len);
-
- return total_len;
}
void pstore_record_init(struct pstore_record *record,
@@ -426,13 +281,8 @@ static void pstore_dump(struct kmsg_dumper *dumper,
record.part = part;
record.buf = psinfo->buf;
- if (big_oops_buf) {
- dst = big_oops_buf;
- dst_size = big_oops_buf_sz;
- } else {
- dst = psinfo->buf;
- dst_size = psinfo->bufsize;
- }
+ dst = big_oops_buf ?: psinfo->buf;
+ dst_size = psinfo->bufsize;
/* Write dump header. */
header_size = snprintf(dst, dst_size, "%s#%d Part%u\n", why,
@@ -453,8 +303,8 @@ static void pstore_dump(struct kmsg_dumper *dumper,
record.compressed = true;
record.size = zipped_len;
} else {
- record.size = copy_kmsg_to_buffer(header_size,
- dump_size);
+ record.size = header_size + dump_size;
+ memcpy(psinfo->buf, dst, record.size);
}
} else {
record.size = header_size + dump_size;
@@ -703,8 +553,7 @@ static void decompress_record(struct pstore_record *record)
}
/* Allocate enough space to hold max decompression and ECC. */
- unzipped_len = big_oops_buf_sz;
- workspace = kmalloc(unzipped_len + record->ecc_notice_size,
+ workspace = kmalloc(psinfo->bufsize + record->ecc_notice_size,
GFP_KERNEL);
if (!workspace)
return;
@@ -818,27 +667,10 @@ static void pstore_timefunc(struct timer_list *unused)
pstore_timer_kick();
}
-static void __init pstore_choose_compression(void)
-{
- const struct pstore_zbackend *step;
-
- if (!compress)
- return;
-
- for (step = zbackends; step->name; step++) {
- if (!strcmp(compress, step->name)) {
- zbackend = step;
- return;
- }
- }
-}
-
static int __init pstore_init(void)
{
int ret;
- pstore_choose_compression();
-
/*
* Check if any pstore backends registered earlier but did not
* initialize compression because crypto was not ready. If so,
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-24 14:40:27 +0000