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authorKees Cook <keescook@chromium.org>2020-05-08 18:42:12 +0300
committerKees Cook <keescook@chromium.org>2020-05-30 20:34:02 +0300
commit16a583079e937f6f5e6274ef7fda6dbf7dcb669f (patch)
treed18206ff6cac569bbe70e9903110964222c34717
parentdf9bf19d88965758c700f46ef75110336fea8654 (diff)
downloadlinux-16a583079e937f6f5e6274ef7fda6dbf7dcb669f.tar.xz
pstore/ftrace: Provide ftrace log merging routine
Move the ftrace log merging logic out of pstore/ram into pstore/ftrace so other backends can use it, like pstore/zone. Link: https://lore.kernel.org/lkml/20200510202436.63222-7-keescook@chromium.org/ Signed-off-by: Kees Cook <keescook@chromium.org>
-rw-r--r--fs/pstore/ftrace.c54
-rw-r--r--fs/pstore/internal.h9
-rw-r--r--fs/pstore/ram.c57
3 files changed, 66 insertions, 54 deletions
diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c
index bfbfc2698070..5c0450701293 100644
--- a/fs/pstore/ftrace.c
+++ b/fs/pstore/ftrace.c
@@ -16,6 +16,7 @@
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/cache.h>
+#include <linux/slab.h>
#include <asm/barrier.h>
#include "internal.h"
@@ -132,3 +133,56 @@ void pstore_unregister_ftrace(void)
debugfs_remove_recursive(pstore_ftrace_dir);
}
+
+ssize_t pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
+ const char *src_log, size_t src_log_size)
+{
+ size_t dest_size, src_size, total, dest_off, src_off;
+ size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
+ void *merged_buf;
+ struct pstore_ftrace_record *drec, *srec, *mrec;
+ size_t record_size = sizeof(struct pstore_ftrace_record);
+
+ dest_off = *dest_log_size % record_size;
+ dest_size = *dest_log_size - dest_off;
+
+ src_off = src_log_size % record_size;
+ src_size = src_log_size - src_off;
+
+ total = dest_size + src_size;
+ merged_buf = kmalloc(total, GFP_KERNEL);
+ if (!merged_buf)
+ return -ENOMEM;
+
+ drec = (struct pstore_ftrace_record *)(*dest_log + dest_off);
+ srec = (struct pstore_ftrace_record *)(src_log + src_off);
+ mrec = (struct pstore_ftrace_record *)(merged_buf);
+
+ while (dest_size > 0 && src_size > 0) {
+ if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
+ pstore_ftrace_read_timestamp(&srec[src_idx])) {
+ mrec[merged_idx++] = drec[dest_idx++];
+ dest_size -= record_size;
+ } else {
+ mrec[merged_idx++] = srec[src_idx++];
+ src_size -= record_size;
+ }
+ }
+
+ while (dest_size > 0) {
+ mrec[merged_idx++] = drec[dest_idx++];
+ dest_size -= record_size;
+ }
+
+ while (src_size > 0) {
+ mrec[merged_idx++] = srec[src_idx++];
+ src_size -= record_size;
+ }
+
+ kfree(*dest_log);
+ *dest_log = merged_buf;
+ *dest_log_size = total;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pstore_ftrace_combine_log);
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index 8efd72d93b10..7fb219042f13 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -12,9 +12,18 @@ extern unsigned long kmsg_bytes;
#ifdef CONFIG_PSTORE_FTRACE
extern void pstore_register_ftrace(void);
extern void pstore_unregister_ftrace(void);
+ssize_t pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
+ const char *src_log, size_t src_log_size);
#else
static inline void pstore_register_ftrace(void) {}
static inline void pstore_unregister_ftrace(void) {}
+static inline ssize_t
+pstore_ftrace_combine_log(char **dest_log, size_t *dest_log_size,
+ const char *src_log, size_t src_log_size)
+{
+ *dest_log_size = 0;
+ return 0;
+}
#endif
#ifdef CONFIG_PSTORE_PMSG
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index dba9b4e3dc3f..26a1f502a3ea 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -21,6 +21,7 @@
#include <linux/pstore_ram.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include "internal.h"
#define RAMOOPS_KERNMSG_HDR "===="
#define MIN_MEM_SIZE 4096UL
@@ -168,59 +169,6 @@ static bool prz_ok(struct persistent_ram_zone *prz)
persistent_ram_ecc_string(prz, NULL, 0));
}
-static
-ssize_t ftrace_log_combine(char **dest_log, size_t *dest_log_size,
- const char *src_log, size_t src_log_size)
-{
- size_t dest_size, src_size, total, dest_off, src_off;
- size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
- void *merged_buf;
- struct pstore_ftrace_record *drec, *srec, *mrec;
- size_t record_size = sizeof(struct pstore_ftrace_record);
-
- dest_off = *dest_log_size % record_size;
- dest_size = *dest_log_size - dest_off;
-
- src_off = src_log_size % record_size;
- src_size = src_log_size - src_off;
-
- total = dest_size + src_size;
- merged_buf = kmalloc(total, GFP_KERNEL);
- if (!merged_buf)
- return -ENOMEM;
-
- drec = (struct pstore_ftrace_record *)(*dest_log + dest_off);
- srec = (struct pstore_ftrace_record *)(src_log + src_off);
- mrec = (struct pstore_ftrace_record *)(merged_buf);
-
- while (dest_size > 0 && src_size > 0) {
- if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
- pstore_ftrace_read_timestamp(&srec[src_idx])) {
- mrec[merged_idx++] = drec[dest_idx++];
- dest_size -= record_size;
- } else {
- mrec[merged_idx++] = srec[src_idx++];
- src_size -= record_size;
- }
- }
-
- while (dest_size > 0) {
- mrec[merged_idx++] = drec[dest_idx++];
- dest_size -= record_size;
- }
-
- while (src_size > 0) {
- mrec[merged_idx++] = srec[src_idx++];
- src_size -= record_size;
- }
-
- kfree(*dest_log);
- *dest_log = merged_buf;
- *dest_log_size = total;
-
- return 0;
-}
-
static ssize_t ramoops_pstore_read(struct pstore_record *record)
{
ssize_t size = 0;
@@ -293,7 +241,8 @@ static ssize_t ramoops_pstore_read(struct pstore_record *record)
prz_next->corrected_bytes;
tmp_prz->bad_blocks += prz_next->bad_blocks;
- size = ftrace_log_combine(&tmp_prz->old_log,
+ size = pstore_ftrace_combine_log(
+ &tmp_prz->old_log,
&tmp_prz->old_log_size,
prz_next->old_log,
prz_next->old_log_size);