From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp05.in.ibm.com (e28smtp05.in.ibm.com [122.248.162.5]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp05.in.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id D24022C0375 for ; Fri, 16 Aug 2013 23:18:31 +1000 (EST) Received: from /spool/local by e28smtp05.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 16 Aug 2013 18:42:09 +0530 Received: from d28relay02.in.ibm.com (d28relay02.in.ibm.com [9.184.220.59]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id D196C394004D for ; Fri, 16 Aug 2013 18:48:17 +0530 (IST) Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay02.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r7GDJrFv39321756 for ; Fri, 16 Aug 2013 18:49:53 +0530 Received: from d28av01.in.ibm.com (localhost [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id r7GDIObu017718 for ; Fri, 16 Aug 2013 18:48:25 +0530 Subject: [RFC PATCH v2 06/11] pstore: Add decompression support to pstore To: linuxppc-dev@ozlabs.org, tony.luck@intel.com, linux-kernel@vger.kernel.org, keescook@chromium.org From: Aruna Balakrishnaiah Date: Fri, 16 Aug 2013 18:48:21 +0530 Message-ID: <20130816131821.3338.27923.stgit@aruna-ThinkPad-T420> In-Reply-To: <20130816131403.3338.82330.stgit@aruna-ThinkPad-T420> References: <20130816131403.3338.82330.stgit@aruna-ThinkPad-T420> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: jkenisto@linux.vnet.ibm.com, cbouatmailru@gmail.com, mahesh@linux.vnet.ibm.com, ccross@android.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Based on the flag 'compressed' set or not, pstore will decompress the data returning a plain text file. If decompression fails for a particular record it will have the compressed data in the file which can be decompressed with 'openssl' command line tool. Signed-off-by: Aruna Balakrishnaiah --- fs/pstore/platform.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 51 insertions(+), 2 deletions(-) diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 6418eb7..0195cca0 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -162,6 +162,36 @@ error: return ret; } +/* Derived from logfs_uncompress */ +int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen) +{ + int err, ret; + + ret = -EIO; + err = zlib_inflateInit(&stream); + if (err != Z_OK) + goto error; + + stream.next_in = in; + stream.avail_in = inlen; + stream.total_in = 0; + stream.next_out = out; + stream.avail_out = outlen; + stream.total_out = 0; + + err = zlib_inflate(&stream, Z_FINISH); + if (err != Z_STREAM_END) + goto error; + + err = zlib_inflateEnd(&stream); + if (err != Z_OK) + goto error; + + ret = stream.total_out; +error: + return ret; +} + static void allocate_buf_for_compression(void) { size_t size; @@ -429,6 +459,7 @@ void pstore_get_records(int quiet) struct timespec time; int failed = 0, rc; bool compressed; + int unzipped_len = -1; if (!psi) return; @@ -439,10 +470,28 @@ void pstore_get_records(int quiet) while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed, psi)) > 0) { + if (compressed && (type == PSTORE_TYPE_DMESG)) { + if (big_oops_buf) + unzipped_len = pstore_decompress(buf, + big_oops_buf, size, + big_oops_buf_sz); + + if (unzipped_len > 0) { + buf = big_oops_buf; + size = unzipped_len; + } else { + pr_err("pstore: decompression failed;" + "returned %d\n", unzipped_len); + } + } rc = pstore_mkfile(type, psi->name, id, count, buf, (size_t)size, time, psi); - kfree(buf); - buf = NULL; + if (unzipped_len < 0) { + /* Free buffer other than big oops */ + kfree(buf); + buf = NULL; + } else + unzipped_len = -1; if (rc && (rc != -EEXIST || !quiet)) failed++; }