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Date: Tue, 24 Mar 2009 17:33:01 +0100 (CET)
From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To: Phillip Lougher <phillip@...gher.demon.co.uk>
cc: Herbert Xu <herbert@...dor.apana.org.au>,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH/RFC] crypto: compress - Return produced bytes in
crypto_{,de}compress_{update,final}() (was: Re: [PATCH/RFC] crypto: compress
- Add comp_request.total_out (was: Re: [PATCH 6/6] squashfs: Make SquashFS
4 use the new pcomp crypto interface))
On Tue, 17 Mar 2009, Geert Uytterhoeven wrote:
> On Wed, 11 Mar 2009, Geert Uytterhoeven wrote:
> > On Sun, 8 Mar 2009, Phillip Lougher wrote:
> > > Two API issues of concern (one major, one minor). Both of these relate to the
> > > way Squashfs drives the decompression code, where it repeatedly calls it
> > > supplying additional input/output buffers, rather than using a "single-shot"
> > > approach where it calls the decompression code once supplying all the
> > > necessary input and output buffer space.
> > >
> > > 1. Minor issue -the lack of a stream.total_out field. The current
> > > zlib_inflate code collects the total number of bytes decompressed over the
> > > multiple calls into the stream.total_out field.
> > >
> > > There is clearly no such field available in the cryto API, leading to the
> > > somewhat clumsy need to track it, i.e. it leads to the following additional
> > > code.
> >
> > If people feel the need for a total_out field, I can add it to struct
> > comp_request.
> >
> > BTW, what about total_in, which is also provided by plain zlib's z_stream?
> > Do people see a need for a similar field?
>
> The patch below (on top of the updated one to convert SquashFS to pcomp) adds
> comp_request.total_out, so you don't have to calculate and accumulate the
> decompressed output sizes in SquashFS.
>
> Notes:
> - This required the addition of a `struct comp_request *' parameter to
> crypto_{,de}compress_init()
> - Still, there's one of the
>
> produced = req.avail_out;
> ...
> produced -= req.avail_out;
>
> left, as this is part of the logic to discover the end of decompression
> (no bytes produced, no error returned).
>
> Perhaps it's better to instead make crypto_{,de}compress_{update,final}()
> return the (positive) number of output bytes (of the current step)?
>
> Currently it returns zero (no error) or a negative error value.
> That would allow to get rid of both `produced = ... / produced -= ...'
> constructs, but the user would have to accumulate the total output size again
> (which is not such a big deal, IMHO).
Here's an alternative patch, which does exactly that.
Phillip, what do you think?
Thanks for your comments!
>From be7d630f96a85d3ce48716b8e328563ba217647b Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Date: Tue, 24 Mar 2009 17:19:05 +0100
Subject: [PATCH] crypto: compress - Return produced bytes in crypto_{,de}compress_{update,final}()
If crypto_{,de}compress_{update,final}() succeed, return the actual number of
bytes produced instead of zero, so their users don't have to calculate that
theirselves.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
---
crypto/testmgr.c | 117 ++++++++++++++++++++++++++++++--------------------
crypto/zlib.c | 24 +++++-----
fs/squashfs/block.c | 33 ++++++---------
3 files changed, 95 insertions(+), 79 deletions(-)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index b50c3c6..9cee018 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -914,24 +914,25 @@ static int test_pcomp(struct crypto_pcomp *tfm,
const char *algo = crypto_tfm_alg_driver_name(crypto_pcomp_tfm(tfm));
unsigned int i;
char result[COMP_BUF_SIZE];
- int error;
+ int res;
for (i = 0; i < ctcount; i++) {
struct comp_request req;
+ unsigned int produced = 0;
- error = crypto_compress_setup(tfm, ctemplate[i].params,
- ctemplate[i].paramsize);
- if (error) {
+ res = crypto_compress_setup(tfm, ctemplate[i].params,
+ ctemplate[i].paramsize);
+ if (res) {
pr_err("alg: pcomp: compression setup failed on test "
- "%d for %s: error=%d\n", i + 1, algo, error);
- return error;
+ "%d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
- error = crypto_compress_init(tfm);
- if (error) {
+ res = crypto_compress_init(tfm);
+ if (res) {
pr_err("alg: pcomp: compression init failed on test "
- "%d for %s: error=%d\n", i + 1, algo, error);
- return error;
+ "%d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
memset(result, 0, sizeof(result));
@@ -941,32 +942,37 @@ static int test_pcomp(struct crypto_pcomp *tfm,
req.next_out = result;
req.avail_out = ctemplate[i].outlen / 2;
- error = crypto_compress_update(tfm, &req);
- if (error && (error != -EAGAIN || req.avail_in)) {
+ res = crypto_compress_update(tfm, &req);
+ if (res < 0 && (res != -EAGAIN || req.avail_in)) {
pr_err("alg: pcomp: compression update failed on test "
- "%d for %s: error=%d\n", i + 1, algo, error);
- return error;
+ "%d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
+ if (res > 0)
+ produced += res;
/* Add remaining input data */
req.avail_in += (ctemplate[i].inlen + 1) / 2;
- error = crypto_compress_update(tfm, &req);
- if (error && (error != -EAGAIN || req.avail_in)) {
+ res = crypto_compress_update(tfm, &req);
+ if (res < 0 && (res != -EAGAIN || req.avail_in)) {
pr_err("alg: pcomp: compression update failed on test "
- "%d for %s: error=%d\n", i + 1, algo, error);
- return error;
+ "%d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
+ if (res > 0)
+ produced += res;
/* Provide remaining output space */
req.avail_out += COMP_BUF_SIZE - ctemplate[i].outlen / 2;
- error = crypto_compress_final(tfm, &req);
- if (error) {
+ res = crypto_compress_final(tfm, &req);
+ if (res < 0) {
pr_err("alg: pcomp: compression final failed on test "
- "%d for %s: error=%d\n", i + 1, algo, error);
- return error;
+ "%d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
+ produced += res;
if (COMP_BUF_SIZE - req.avail_out != ctemplate[i].outlen) {
pr_err("alg: comp: Compression test %d failed for %s: "
@@ -976,6 +982,13 @@ static int test_pcomp(struct crypto_pcomp *tfm,
return -EINVAL;
}
+ if (produced != ctemplate[i].outlen) {
+ pr_err("alg: comp: Compression test %d failed for %s: "
+ "returned len = %u (expected %d)\n", i + 1,
+ algo, produced, ctemplate[i].outlen);
+ return -EINVAL;
+ }
+
if (memcmp(result, ctemplate[i].output, ctemplate[i].outlen)) {
pr_err("alg: pcomp: Compression test %d failed for "
"%s\n", i + 1, algo);
@@ -986,21 +999,21 @@ static int test_pcomp(struct crypto_pcomp *tfm,
for (i = 0; i < dtcount; i++) {
struct comp_request req;
+ unsigned int produced = 0;
- error = crypto_decompress_setup(tfm, dtemplate[i].params,
- dtemplate[i].paramsize);
- if (error) {
+ res = crypto_decompress_setup(tfm, dtemplate[i].params,
+ dtemplate[i].paramsize);
+ if (res) {
pr_err("alg: pcomp: decompression setup failed on "
- "test %d for %s: error=%d\n", i + 1, algo,
- error);
- return error;
+ "test %d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
- error = crypto_decompress_init(tfm);
- if (error) {
+ res = crypto_decompress_init(tfm);
+ if (res) {
pr_err("alg: pcomp: decompression init failed on test "
- "%d for %s: error=%d\n", i + 1, algo, error);
- return error;
+ "%d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
memset(result, 0, sizeof(result));
@@ -1010,35 +1023,38 @@ static int test_pcomp(struct crypto_pcomp *tfm,
req.next_out = result;
req.avail_out = dtemplate[i].outlen / 2;
- error = crypto_decompress_update(tfm, &req);
- if (error && (error != -EAGAIN || req.avail_in)) {
+ res = crypto_decompress_update(tfm, &req);
+ if (res < 0 && (res != -EAGAIN || req.avail_in)) {
pr_err("alg: pcomp: decompression update failed on "
- "test %d for %s: error=%d\n", i + 1, algo,
- error);
- return error;
+ "test %d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
+ if (res > 0)
+ produced += res;
/* Add remaining input data */
req.avail_in += (dtemplate[i].inlen + 1) / 2;
- error = crypto_decompress_update(tfm, &req);
- if (error && (error != -EAGAIN || req.avail_in)) {
+ res = crypto_decompress_update(tfm, &req);
+ if (res < 0 && (res != -EAGAIN || req.avail_in)) {
pr_err("alg: pcomp: decompression update failed on "
- "test %d for %s: error=%d\n", i + 1, algo,
- error);
- return error;
+ "test %d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
+ if (res > 0)
+ produced += res;
/* Provide remaining output space */
req.avail_out += COMP_BUF_SIZE - dtemplate[i].outlen / 2;
- error = crypto_decompress_final(tfm, &req);
- if (error && (error != -EAGAIN || req.avail_in)) {
+ res = crypto_decompress_final(tfm, &req);
+ if (res < 0 && (res != -EAGAIN || req.avail_in)) {
pr_err("alg: pcomp: decompression final failed on "
- "test %d for %s: error=%d\n", i + 1, algo,
- error);
- return error;
+ "test %d for %s: error=%d\n", i + 1, algo, res);
+ return res;
}
+ if (res > 0)
+ produced += res;
if (COMP_BUF_SIZE - req.avail_out != dtemplate[i].outlen) {
pr_err("alg: comp: Decompression test %d failed for "
@@ -1048,6 +1064,13 @@ static int test_pcomp(struct crypto_pcomp *tfm,
return -EINVAL;
}
+ if (produced != dtemplate[i].outlen) {
+ pr_err("alg: comp: Decompression test %d failed for "
+ "%s: returned len = %u (expected %d)\n", i + 1,
+ algo, produced, dtemplate[i].outlen);
+ return -EINVAL;
+ }
+
if (memcmp(result, dtemplate[i].output, dtemplate[i].outlen)) {
pr_err("alg: pcomp: Decompression test %d failed for "
"%s\n", i + 1, algo);
diff --git a/crypto/zlib.c b/crypto/zlib.c
index 33609ba..c301573 100644
--- a/crypto/zlib.c
+++ b/crypto/zlib.c
@@ -165,15 +165,15 @@ static int zlib_compress_update(struct crypto_pcomp *tfm,
return -EINVAL;
}
+ ret = req->avail_out - stream->avail_out;
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
- req->avail_in - stream->avail_in,
- req->avail_out - stream->avail_out);
+ req->avail_in - stream->avail_in, ret);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
- return 0;
+ return ret;
}
static int zlib_compress_final(struct crypto_pcomp *tfm,
@@ -195,15 +195,15 @@ static int zlib_compress_final(struct crypto_pcomp *tfm,
return -EINVAL;
}
+ ret = req->avail_out - stream->avail_out;
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
- req->avail_in - stream->avail_in,
- req->avail_out - stream->avail_out);
+ req->avail_in - stream->avail_in, ret);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
- return 0;
+ return ret;
}
@@ -280,15 +280,15 @@ static int zlib_decompress_update(struct crypto_pcomp *tfm,
return -EINVAL;
}
+ ret = req->avail_out - stream->avail_out;
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
- req->avail_in - stream->avail_in,
- req->avail_out - stream->avail_out);
+ req->avail_in - stream->avail_in, ret);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
- return 0;
+ return ret;
}
static int zlib_decompress_final(struct crypto_pcomp *tfm,
@@ -328,15 +328,15 @@ static int zlib_decompress_final(struct crypto_pcomp *tfm,
return -EINVAL;
}
+ ret = req->avail_out - stream->avail_out;
pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
stream->avail_in, stream->avail_out,
- req->avail_in - stream->avail_in,
- req->avail_out - stream->avail_out);
+ req->avail_in - stream->avail_in, ret);
req->next_in = stream->next_in;
req->avail_in = stream->avail_in;
req->next_out = stream->next_out;
req->avail_out = stream->avail_out;
- return 0;
+ return ret;
}
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 6196821..433f065 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -154,9 +154,8 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
}
if (compressed) {
- int error = 0, decomp_init = 0;
+ int res = 0, decomp_init = 0;
struct comp_request req;
- unsigned int produced = 0;
/*
* Uncompress block.
@@ -194,41 +193,35 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
}
if (!decomp_init) {
- error = crypto_decompress_init(msblk->tfm);
- if (error) {
+ res = crypto_decompress_init(msblk->tfm);
+ if (res) {
ERROR("crypto_decompress_init "
"returned %d, srclength %d\n",
- error, srclength);
+ res, srclength);
goto release_mutex;
}
decomp_init = 1;
}
- produced = req.avail_out;
- error = crypto_decompress_update(msblk->tfm, &req);
- if (error) {
+ res = crypto_decompress_update(msblk->tfm, &req);
+ if (res < 0) {
ERROR("crypto_decompress_update returned %d, "
- "data probably corrupt\n", error);
+ "data probably corrupt\n", res);
goto release_mutex;
}
- produced -= req.avail_out;
-
- length += produced;
+ length += res;
if (req.avail_in == 0 && k < b)
put_bh(bh[k++]);
- } while (bytes || produced);
+ } while (bytes || res);
- produced = req.avail_out;
- error = crypto_decompress_final(msblk->tfm, &req);
- if (error) {
+ res = crypto_decompress_final(msblk->tfm, &req);
+ if (res < 0) {
ERROR("crypto_decompress_final returned %d, data "
- "probably corrupt\n", error);
+ "probably corrupt\n", res);
goto release_mutex;
}
- produced -= req.avail_out;
-
- length += produced;
+ length += res;
mutex_unlock(&msblk->read_data_mutex);
} else {
--
1.6.0.4
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@...ycom.com
Internet: http://www.sony-europe.com/
A division of Sony Europe (Belgium) N.V.
VAT BE 0413.825.160 · RPR Brussels
Fortis · BIC GEBABEBB · IBAN BE41293037680010
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