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author | Kees Cook <keescook@chromium.org> | 2017-03-04 02:35:25 +0100 |
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committer | Kees Cook <keescook@chromium.org> | 2017-03-07 23:00:54 +0100 |
commit | 634f8f5167c88052ce6d28e519ff6325172191dc (patch) | |
tree | 8709cf4baac0d127482b31d1df849ae1c1d2489d /fs/pstore | |
parent | pstore: Extract common arguments into structure (diff) | |
download | linux-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.c | 67 |
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++; |