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authorKees Cook <keescook@chromium.org>2017-03-04 02:35:25 +0100
committerKees Cook <keescook@chromium.org>2017-03-07 23:00:54 +0100
commit634f8f5167c88052ce6d28e519ff6325172191dc (patch)
tree8709cf4baac0d127482b31d1df849ae1c1d2489d /fs/pstore
parentpstore: Extract common arguments into structure (diff)
downloadlinux-634f8f5167c88052ce6d28e519ff6325172191dc.tar.xz
linux-634f8f5167c88052ce6d28e519ff6325172191dc.zip
pstore: Move record decompression to function
This moves the record decompression logic out to a separate function to avoid the deep indentation. Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/platform.c67
1 files changed, 37 insertions, 30 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index f45228eac3e6..0503380704de 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -757,6 +757,37 @@ void pstore_unregister(struct pstore_info *psi)
}
EXPORT_SYMBOL_GPL(pstore_unregister);
+static void decompress_record(struct pstore_record *record)
+{
+ int unzipped_len;
+
+ /* Only PSTORE_TYPE_DMESG support compression. */
+ if (!record->compressed || record->type != PSTORE_TYPE_DMESG) {
+ pr_warn("ignored compressed record type %d\n", record->type);
+ return;
+ }
+
+ /* No compression method has created the common buffer. */
+ if (!big_oops_buf) {
+ pr_warn("no decompression buffer allocated\n");
+ return;
+ }
+
+ unzipped_len = pstore_decompress(record->buf, big_oops_buf,
+ record->size, big_oops_buf_sz);
+ if (unzipped_len > 0) {
+ if (record->ecc_notice_size)
+ memcpy(big_oops_buf + unzipped_len,
+ record->buf + record->size,
+ record->ecc_notice_size);
+ kfree(record->buf);
+ record->buf = big_oops_buf;
+ record->size = unzipped_len;
+ record->compressed = false;
+ } else
+ pr_err("decompression failed: %d\n", unzipped_len);
+}
+
/*
* Read all the records from the persistent store. Create
* files in our filesystem. Don't warn about -EEXIST errors
@@ -768,7 +799,6 @@ void pstore_get_records(int quiet)
struct pstore_info *psi = psinfo;
struct pstore_record record = { .psi = psi, };
int failed = 0, rc;
- int unzipped_len = -1;
if (!psi)
return;
@@ -782,41 +812,18 @@ void pstore_get_records(int quiet)
&record.buf, &record.compressed,
&record.ecc_notice_size,
record.psi)) > 0) {
- if (record.compressed &&
- record.type == PSTORE_TYPE_DMESG) {
- if (big_oops_buf)
- unzipped_len = pstore_decompress(
- record.buf,
- big_oops_buf,
- record.size,
- big_oops_buf_sz);
-
- if (unzipped_len > 0) {
- if (record.ecc_notice_size)
- memcpy(big_oops_buf + unzipped_len,
- record.buf + record.size,
- record.ecc_notice_size);
- kfree(record.buf);
- record.buf = big_oops_buf;
- record.size = unzipped_len;
- record.compressed = false;
- } else {
- pr_err("decompression failed;returned %d\n",
- unzipped_len);
- record.compressed = true;
- }
- }
+
+ decompress_record(&record);
rc = pstore_mkfile(record.type, psi->name, record.id,
record.count, record.buf,
record.compressed,
record.size + record.ecc_notice_size,
record.time, record.psi);
- if (unzipped_len < 0) {
- /* Free buffer other than big oops */
+
+ /* Free buffer other than big oops */
+ if (record.buf != big_oops_buf)
kfree(record.buf);
- record.buf = NULL;
- } else
- unzipped_len = -1;
+
if (rc && (rc != -EEXIST || !quiet))
failed++;