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-rw-r--r--fs/pstore/Kconfig2
-rw-r--r--fs/pstore/inode.c10
-rw-r--r--fs/pstore/internal.h5
-rw-r--r--fs/pstore/platform.c212
-rw-r--r--fs/pstore/ram.c47
5 files changed, 242 insertions, 34 deletions
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index ca71db69da07..983d9510becc 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -1,6 +1,8 @@
config PSTORE
bool "Persistent store support"
default n
+ select ZLIB_DEFLATE
+ select ZLIB_INFLATE
help
This option enables generic access to platform level
persistent storage via "pstore" filesystem that can
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 71bf5f4ae84c..12823845d324 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -275,8 +275,8 @@ int pstore_is_mounted(void)
* Set the mtime & ctime to the date that this record was originally stored.
*/
int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
- char *data, size_t size, struct timespec time,
- struct pstore_info *psi)
+ char *data, bool compressed, size_t size,
+ struct timespec time, struct pstore_info *psi)
{
struct dentry *root = pstore_sb->s_root;
struct dentry *dentry;
@@ -315,7 +315,8 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
switch (type) {
case PSTORE_TYPE_DMESG:
- sprintf(name, "dmesg-%s-%lld", psname, id);
+ sprintf(name, "dmesg-%s-%lld%s", psname, id,
+ compressed ? ".enc.z" : "");
break;
case PSTORE_TYPE_CONSOLE:
sprintf(name, "console-%s", psname);
@@ -345,9 +346,8 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
mutex_lock(&root->d_inode->i_mutex);
- rc = -ENOSPC;
dentry = d_alloc_name(root, name);
- if (IS_ERR(dentry))
+ if (!dentry)
goto fail_lockedalloc;
memcpy(private->data, data, size);
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index 937d820f273c..3b3d305277c4 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -50,8 +50,9 @@ extern struct pstore_info *psinfo;
extern void pstore_set_kmsg_bytes(int);
extern void pstore_get_records(int);
extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
- int count, char *data, size_t size,
- struct timespec time, struct pstore_info *psi);
+ int count, char *data, bool compressed,
+ size_t size, struct timespec time,
+ struct pstore_info *psi);
extern int pstore_is_mounted(void);
#endif
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 422962ae9fc2..4ffb7ab5e397 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -26,6 +26,7 @@
#include <linux/console.h>
#include <linux/module.h>
#include <linux/pstore.h>
+#include <linux/zlib.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
@@ -65,6 +66,15 @@ struct pstore_info *psinfo;
static char *backend;
+/* Compression parameters */
+#define COMPR_LEVEL 6
+#define WINDOW_BITS 12
+#define MEM_LEVEL 4
+static struct z_stream_s stream;
+
+static char *big_oops_buf;
+static size_t big_oops_buf_sz;
+
/* How much of the console log to snapshot */
static unsigned long kmsg_bytes = 10240;
@@ -117,6 +127,121 @@ bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
}
EXPORT_SYMBOL_GPL(pstore_cannot_block_path);
+/* Derived from logfs_compress() */
+static int pstore_compress(const void *in, void *out, size_t inlen,
+ size_t outlen)
+{
+ int err, ret;
+
+ ret = -EIO;
+ err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
+ MEM_LEVEL, Z_DEFAULT_STRATEGY);
+ if (err != Z_OK)
+ goto error;
+
+ stream.next_in = in;
+ stream.avail_in = inlen;
+ stream.total_in = 0;
+ stream.next_out = out;
+ stream.avail_out = outlen;
+ stream.total_out = 0;
+
+ err = zlib_deflate(&stream, Z_FINISH);
+ if (err != Z_STREAM_END)
+ goto error;
+
+ err = zlib_deflateEnd(&stream);
+ if (err != Z_OK)
+ goto error;
+
+ if (stream.total_out >= stream.total_in)
+ goto error;
+
+ ret = stream.total_out;
+error:
+ return ret;
+}
+
+/* Derived from logfs_uncompress */
+static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen)
+{
+ int err, ret;
+
+ ret = -EIO;
+ err = zlib_inflateInit(&stream);
+ if (err != Z_OK)
+ goto error;
+
+ stream.next_in = in;
+ stream.avail_in = inlen;
+ stream.total_in = 0;
+ stream.next_out = out;
+ stream.avail_out = outlen;
+ stream.total_out = 0;
+
+ err = zlib_inflate(&stream, Z_FINISH);
+ if (err != Z_STREAM_END)
+ goto error;
+
+ err = zlib_inflateEnd(&stream);
+ if (err != Z_OK)
+ goto error;
+
+ ret = stream.total_out;
+error:
+ return ret;
+}
+
+static void allocate_buf_for_compression(void)
+{
+ size_t size;
+
+ big_oops_buf_sz = (psinfo->bufsize * 100) / 45;
+ big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
+ if (big_oops_buf) {
+ size = max(zlib_deflate_workspacesize(WINDOW_BITS, MEM_LEVEL),
+ zlib_inflate_workspacesize());
+ stream.workspace = kmalloc(size, GFP_KERNEL);
+ if (!stream.workspace) {
+ pr_err("pstore: No memory for compression workspace; "
+ "skipping compression\n");
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ }
+ } else {
+ pr_err("No memory for uncompressed data; "
+ "skipping compression\n");
+ stream.workspace = NULL;
+ }
+
+}
+
+/*
+ * 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;
+}
+
/*
* callback from kmsg_dump. (s2,l2) has the most recently
* written bytes, older bytes are in (s1,l1). Save as much
@@ -148,22 +273,56 @@ static void pstore_dump(struct kmsg_dumper *dumper,
char *dst;
unsigned long size;
int hsize;
+ int zipped_len = -1;
size_t len;
+ bool compressed;
+ size_t total_len;
- dst = psinfo->buf;
- hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
- size = psinfo->bufsize - hsize;
- dst += hsize;
+ if (big_oops_buf) {
+ dst = big_oops_buf;
+ hsize = sprintf(dst, "%s#%d Part%d\n", why,
+ oopscount, part);
+ size = big_oops_buf_sz - hsize;
- if (!kmsg_dump_get_buffer(dumper, true, dst, size, &len))
- break;
+ if (!kmsg_dump_get_buffer(dumper, true, dst + hsize,
+ size, &len))
+ break;
+
+ zipped_len = pstore_compress(dst, psinfo->buf,
+ hsize + len, psinfo->bufsize);
+
+ if (zipped_len > 0) {
+ compressed = true;
+ total_len = zipped_len;
+ } else {
+ pr_err("pstore: compression failed for Part %d"
+ " returned %d\n", part, zipped_len);
+ pr_err("pstore: Capture uncompressed"
+ " oops/panic report of Part %d\n", part);
+ compressed = false;
+ total_len = copy_kmsg_to_buffer(hsize, len);
+ }
+ } else {
+ dst = psinfo->buf;
+ hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount,
+ part);
+ size = psinfo->bufsize - hsize;
+ dst += hsize;
+
+ if (!kmsg_dump_get_buffer(dumper, true, dst,
+ size, &len))
+ break;
+
+ compressed = false;
+ total_len = hsize + len;
+ }
ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
- oopscount, hsize, hsize + len, psinfo);
+ oopscount, compressed, total_len, psinfo);
if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_new_entry = 1;
- total += hsize + len;
+ total += total_len;
part++;
}
if (pstore_cannot_block_path(reason)) {
@@ -221,10 +380,10 @@ static void pstore_register_console(void) {}
static int pstore_write_compat(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part, int count,
- size_t hsize, size_t size,
+ bool compressed, size_t size,
struct pstore_info *psi)
{
- return psi->write_buf(type, reason, id, part, psinfo->buf, hsize,
+ return psi->write_buf(type, reason, id, part, psinfo->buf, compressed,
size, psi);
}
@@ -261,6 +420,8 @@ int pstore_register(struct pstore_info *psi)
return -EINVAL;
}
+ allocate_buf_for_compression();
+
if (pstore_is_mounted())
pstore_get_records(0);
@@ -297,6 +458,8 @@ void pstore_get_records(int quiet)
enum pstore_type_id type;
struct timespec time;
int failed = 0, rc;
+ bool compressed;
+ int unzipped_len = -1;
if (!psi)
return;
@@ -305,11 +468,32 @@ void pstore_get_records(int quiet)
if (psi->open && psi->open(psi))
goto out;
- while ((size = psi->read(&id, &type, &count, &time, &buf, psi)) > 0) {
+ while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed,
+ 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) {
+ buf = big_oops_buf;
+ size = unzipped_len;
+ compressed = false;
+ } else {
+ pr_err("pstore: decompression failed;"
+ "returned %d\n", unzipped_len);
+ compressed = true;
+ }
+ }
rc = pstore_mkfile(type, psi->name, id, count, buf,
- (size_t)size, time, psi);
- kfree(buf);
- buf = NULL;
+ compressed, (size_t)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++;
}
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index a6119f9469e2..fa8cef2cca3a 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -131,9 +131,31 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
return prz;
}
+static void ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
+ bool *compressed)
+{
+ char data_type;
+
+ if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
+ &time->tv_sec, &time->tv_nsec, &data_type) == 3) {
+ if (data_type == 'C')
+ *compressed = true;
+ else
+ *compressed = false;
+ } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
+ &time->tv_sec, &time->tv_nsec) == 2) {
+ *compressed = false;
+ } else {
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ *compressed = false;
+ }
+}
+
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
- char **buf, struct pstore_info *psi)
+ char **buf, bool *compressed,
+ struct pstore_info *psi)
{
ssize_t size;
ssize_t ecc_notice_size;
@@ -152,10 +174,6 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
if (!prz)
return 0;
- /* TODO(kees): Bogus time for the moment. */
- time->tv_sec = 0;
- time->tv_nsec = 0;
-
size = persistent_ram_old_size(prz);
/* ECC correction notice */
@@ -166,12 +184,14 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
return -ENOMEM;
memcpy(*buf, persistent_ram_old(prz), size);
+ ramoops_read_kmsg_hdr(*buf, time, compressed);
persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
return size + ecc_notice_size;
}
-static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
+static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
+ bool compressed)
{
char *hdr;
struct timespec timestamp;
@@ -182,8 +202,9 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
timestamp.tv_sec = 0;
timestamp.tv_nsec = 0;
}
- hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
- (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000));
+ hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
+ (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
+ compressed ? 'C' : 'D');
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
@@ -196,7 +217,7 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
const char *buf,
- size_t hsize, size_t size,
+ bool compressed, size_t size,
struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
@@ -242,7 +263,7 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
prz = cxt->przs[cxt->dump_write_cnt];
- hlen = ramoops_write_kmsg_hdr(prz);
+ hlen = ramoops_write_kmsg_hdr(prz, compressed);
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
persistent_ram_write(prz, buf, size);
@@ -400,11 +421,11 @@ static int ramoops_probe(struct platform_device *pdev)
goto fail_out;
}
- if (!is_power_of_2(pdata->record_size))
+ if (pdata->record_size && !is_power_of_2(pdata->record_size))
pdata->record_size = rounddown_pow_of_two(pdata->record_size);
- if (!is_power_of_2(pdata->console_size))
+ if (pdata->console_size && !is_power_of_2(pdata->console_size))
pdata->console_size = rounddown_pow_of_two(pdata->console_size);
- if (!is_power_of_2(pdata->ftrace_size))
+ if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
cxt->dump_read_cnt = 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-16 16:49:03 +0000