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authorKees Cook <keescook@chromium.org>2020-05-08 08:34:38 -0700
committerKees Cook <keescook@chromium.org>2020-05-30 10:34:02 -0700
commitdf9bf19d88965758c700f46ef75110336fea8654 (patch)
tree3523faec4afc25c0e227970796c73a669c2fcf15 /fs/pstore
parent26961d76ff35aecb1af0fefd283fb5170786a812 (diff)
downloadlinux-df9bf19d88965758c700f46ef75110336fea8654.tar.bz2
pstore/ram: Refactor ftrace buffer merging
This changes the ftrace record merging code to be agnostic of pstore/ram, as the first step to making it available as a generic routine for other backends to use, such as pstore/zone. Link: https://lore.kernel.org/lkml/20200510202436.63222-6-keescook@chromium.org/ Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/ram.c29
1 files changed, 17 insertions, 12 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 8cdafb686736..dba9b4e3dc3f 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -168,8 +168,9 @@ static bool prz_ok(struct persistent_ram_zone *prz)
persistent_ram_ecc_string(prz, NULL, 0));
}
-static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
- struct persistent_ram_zone *src)
+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;
@@ -177,19 +178,19 @@ static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
struct pstore_ftrace_record *drec, *srec, *mrec;
size_t record_size = sizeof(struct pstore_ftrace_record);
- dest_off = dest->old_log_size % record_size;
- dest_size = dest->old_log_size - dest_off;
+ dest_off = *dest_log_size % record_size;
+ dest_size = *dest_log_size - dest_off;
- src_off = src->old_log_size % record_size;
- src_size = src->old_log_size - src_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->old_log + dest_off);
- srec = (struct pstore_ftrace_record *)(src->old_log + src_off);
+ 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) {
@@ -213,9 +214,9 @@ static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
src_size -= record_size;
}
- kfree(dest->old_log);
- dest->old_log = merged_buf;
- dest->old_log_size = total;
+ kfree(*dest_log);
+ *dest_log = merged_buf;
+ *dest_log_size = total;
return 0;
}
@@ -291,7 +292,11 @@ static ssize_t ramoops_pstore_read(struct pstore_record *record)
tmp_prz->corrected_bytes +=
prz_next->corrected_bytes;
tmp_prz->bad_blocks += prz_next->bad_blocks;
- size = ftrace_log_combine(tmp_prz, prz_next);
+
+ size = ftrace_log_combine(&tmp_prz->old_log,
+ &tmp_prz->old_log_size,
+ prz_next->old_log,
+ prz_next->old_log_size);
if (size)
goto out;
}