get rid of dynamic buffer struct allocation during pcomp lzma decompression and inste...

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17475 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch b/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
index 75dfc37..afb37a8 100644 (file)
--- a/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
+++ b/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
@@ -1,6 +1,6 @@
 --- /dev/null
 +++ b/crypto/unlzma.c
-@@ -0,0 +1,723 @@
+@@ -0,0 +1,748 @@
 +/*
 + * LZMA uncompresion module for pcomp
 + * Copyright (C) 2009  Felix Fietkau <nbd@openwrt.org>
@@ -36,12 +36,12 @@
 +#include <linux/kthread.h>
 +
 +#include <crypto/internal/compress.h>
++#include <net/netlink.h>
 +#include "unlzma.h"
 +
 +static int instance = 0;
 +
 +struct unlzma_buffer {
-+      struct unlzma_buffer *last;
 +      int offset;
 +      int size;
 +      u8 *ptr;
@@ -68,8 +68,10 @@
 +      /* writer state */
 +      u8 previous_byte;
 +      ssize_t pos;
-+      struct unlzma_buffer *head;
 +      int buf_full;
++      int n_buffers;
++      int buffers_max;
++      struct unlzma_buffer *buffers;
 +
 +      /* cstate */
 +      int state;
@@ -92,12 +94,11 @@
 +{
 +      struct unlzma_buffer *bh;
 +
-+      bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
++      BUG_ON(ctx->n_buffers >= ctx->buffers_max);
++      bh = &ctx->buffers[ctx->n_buffers++];
 +      bh->ptr = ctx->next_out;
 +      bh->offset = ctx->pos;
-+      bh->last = ctx->head;
 +      bh->size = ctx->avail_out;
-+      ctx->head = bh;
 +      ctx->buf_full = 0;
 +}
 +
@@ -208,17 +209,20 @@
 +static u8
 +peek_old_byte(struct unlzma_ctx *ctx, u32 offs)
 +{
-+      struct unlzma_buffer *bh = ctx->head;
++      struct unlzma_buffer *bh = &ctx->buffers[ctx->n_buffers - 1];
++      int i = ctx->n_buffers;
 +      u32 pos;
 +
++      BUG_ON(!ctx->n_buffers);
 +      pos = ctx->pos - offs;
 +      if (pos >= ctx->dict_size) {
 +              pos = (~pos % ctx->dict_size);
 +      }
 +
 +      while (bh->offset > pos) {
-+              bh = bh->last;
-+              BUG_ON(!bh);
++              bh--;
++              i--;
++              BUG_ON(!i);
 +      }
 +
 +      pos -= bh->offset;
@@ -460,6 +464,7 @@
 +              hdr_buf[i] = rc_read(ctx);
 +      }
 +
++      ctx->n_buffers = 0;
 +      ctx->pos = 0;
 +      get_buffer(ctx);
 +      ctx->active = true;
@@ -554,11 +559,6 @@
 +              unlzma_reset_buf(ctx);
 +              ctx->cancel = false;
 +              ctx->active = false;
-+              while (ctx->head) {
-+                      struct unlzma_buffer *bh = ctx->head;
-+                      ctx->head = bh->last;
-+                      kfree(bh);
-+              }
 +      } while (!kthread_should_stop());
 +      mutex_unlock(&ctx->mutex);
 +      return 0;
@@ -598,6 +598,10 @@
 +              unlzma_cancel(ctx);
 +              kthread_stop(ctx->thread);
 +              ctx->thread = NULL;
++              if (ctx->buffers)
++                      kfree(ctx->buffers);
++              ctx->buffers_max = 0;
++              ctx->buffers = NULL;
 +      }
 +}
 +
@@ -605,10 +609,31 @@
 +unlzma_decompress_setup(struct crypto_pcomp *tfm, void *p, unsigned int len)
 +{
 +      struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
++      struct nlattr *tb[UNLZMA_DECOMP_MAX + 1];
 +      int ret = 0;
 +
 +      if (ctx->thread)
-+              return 0;
++              return -EINVAL;
++
++      if (!p)
++              return -EINVAL;
++
++      ret = nla_parse(tb, UNLZMA_DECOMP_MAX, p, len, NULL);
++      if (!tb[UNLZMA_DECOMP_OUT_BUFFERS])
++              return -EINVAL;
++
++      if (ctx->buffers_max && (ctx->buffers_max <
++          nla_get_u32(tb[UNLZMA_DECOMP_OUT_BUFFERS]))) {
++              kfree(ctx->buffers);
++              ctx->buffers_max = 0;
++              ctx->buffers = NULL;
++      }
++      if (!ctx->buffers) {
++              ctx->buffers_max = nla_get_u32(tb[UNLZMA_DECOMP_OUT_BUFFERS]);
++              ctx->buffers = kzalloc(sizeof(struct unlzma_buffer) * ctx->buffers_max, GFP_KERNEL);
++      }
++      if (!ctx->buffers)
++              return -ENOMEM;
 +
 +      mutex_init(&ctx->mutex);
 +      init_waitqueue_head(&ctx->next_req);
@@ -832,3 +857,18 @@
 +#define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS)
 +
 +#endif
+--- a/include/crypto/compress.h
++++ b/include/crypto/compress.h
+@@ -49,6 +49,12 @@ enum zlib_decomp_params {
+ 
+ #define ZLIB_DECOMP_MAX       (__ZLIB_DECOMP_MAX - 1)
+ 
++enum unlzma_decomp_params {
++      UNLZMA_DECOMP_OUT_BUFFERS = 1, /* naximum number of output buffers */
++      __UNLZMA_DECOMP_MAX,
++};
++#define UNLZMA_DECOMP_MAX     (__UNLZMA_DECOMP_MAX - 1)
++
+ 
+ struct crypto_pcomp {
+       struct crypto_tfm base;

diff --git a/target/linux/generic-2.6/patches-2.6.30/053-squashfs_lzma.patch b/target/linux/generic-2.6/patches-2.6.30/053-squashfs_lzma.patch
index 35208fd..19deb73 100644 (file)
--- a/target/linux/generic-2.6/patches-2.6.30/053-squashfs_lzma.patch
+++ b/target/linux/generic-2.6/patches-2.6.30/053-squashfs_lzma.patch
@@ -47,7 +47,7 @@
        __le32                  s_magic;
 --- a/fs/squashfs/super.c
 +++ b/fs/squashfs/super.c
-@@ -47,13 +47,65 @@
+@@ -47,13 +47,76 @@
  #include "squashfs.h"
  
  
@@ -81,7 +81,7 @@
 +              crypto_free_pcomp(msblk->tfm);
 +      }
 +#endif
- 
++
 +      return err;
 +}
 +
@@ -90,6 +90,17 @@
 +      int err = -EOPNOTSUPP;
 +
 +#ifdef CONFIG_SQUASHFS_SUPPORT_LZMA
++      struct {
++              struct nlattr nla;
++              int val;
++      } params = {
++              .nla = {
++                      .nla_len        = nla_attr_size(sizeof(int)),
++                      .nla_type       = UNLZMA_DECOMP_OUT_BUFFERS,
++              },
++              .val = (msblk->block_size / PAGE_CACHE_SIZE) + 1
++      };
+ 
 +      msblk->tfm = crypto_alloc_pcomp("lzma", 0,
 +                                      CRYPTO_ALG_ASYNC);
 +      if (IS_ERR(msblk->tfm)) {
@@ -97,7 +108,7 @@
 +              return PTR_ERR(msblk->tfm);
 +      }
 +
-+      err = crypto_decompress_setup(msblk->tfm, NULL, 0);
++      err = crypto_decompress_setup(msblk->tfm, &params, sizeof(params));
 +      if (err) {
 +              ERROR("Failed to set up decompression parameters\n");
 +              crypto_free_pcomp(msblk->tfm);
@@ -115,7 +126,7 @@
  {
        if (major < SQUASHFS_MAJOR) {
                ERROR("Major/Minor mismatch, older Squashfs %d.%d "
-@@ -66,9 +118,6 @@ static int supported_squashfs_filesystem
+@@ -66,9 +129,6 @@ static int supported_squashfs_filesystem
                return -EINVAL;
        }
  
@@ -125,7 +136,7 @@
        return 0;
  }
  
-@@ -83,16 +132,6 @@ static int squashfs_fill_super(struct su
+@@ -83,16 +143,6 @@ static int squashfs_fill_super(struct su
        unsigned short flags;
        unsigned int fragments;
        u64 lookup_table_start;
@@ -142,7 +153,7 @@
        int err;
  
        TRACE("Entered squashfs_fill_superblock\n");
-@@ -104,21 +143,6 @@ static int squashfs_fill_super(struct su
+@@ -104,21 +154,6 @@ static int squashfs_fill_super(struct su
        }
        msblk = sb->s_fs_info;
  
@@ -164,8 +175,15 @@
        sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
        if (sblk == NULL) {
                ERROR("Failed to allocate squashfs_super_block\n");
-@@ -158,8 +182,21 @@ static int squashfs_fill_super(struct su
+@@ -156,10 +191,28 @@ static int squashfs_fill_super(struct su
+               goto failed_mount;
+       }
  
++      /* Check block size for sanity */
++      msblk->block_size = le32_to_cpu(sblk->block_size);
++      if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
++              goto failed_mount;
++
        /* Check the MAJOR & MINOR versions and compression type */
        err = supported_squashfs_filesystem(le16_to_cpu(sblk->s_major),
 -                      le16_to_cpu(sblk->s_minor),
@@ -188,7 +206,19 @@
        if (err < 0)
                goto failed_mount;
  
-@@ -315,21 +352,16 @@ allocate_root:
+@@ -179,11 +232,6 @@ static int squashfs_fill_super(struct su
+                       i_size_read(sb->s_bdev->bd_inode))
+               goto failed_mount;
+ 
+-      /* Check block size for sanity */
+-      msblk->block_size = le32_to_cpu(sblk->block_size);
+-      if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
+-              goto failed_mount;
+-
+       /*
+        * Check the system page size is not larger than the filesystem
+        * block size (by default 128K).  This is currently not supported.
+@@ -315,21 +363,16 @@ allocate_root:
        return 0;
  
  failed_mount: