From 16a583079e937f6f5e6274ef7fda6dbf7dcb669f Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Fri, 8 May 2020 08:42:12 -0700 Subject: 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 --- fs/pstore/ram.c | 57 +++------------------------------------------------------ 1 file changed, 3 insertions(+), 54 deletions(-) (limited to 'fs/pstore/ram.c') 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 #include #include +#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); -- cgit v1.2.3