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Squashfs: move zlib decompression wrapper code into a separate file

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Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
This commit is contained in:
Phillip Lougher
2009-09-22 19:25:24 +01:00
parent 7284ce6c9f
commit e6a6d37955
4 changed files with 118 additions and 71 deletions
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74
fs/squashfs/block.c
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@@ -29,7 +29,6 @@
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/buffer_head.h>
#include <linux/zlib.h>
@@ -153,72 +152,10 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
}
if (compressed) {
int zlib_err = 0, zlib_init = 0;
/*
* Uncompress block.
*/
mutex_lock(&msblk->read_data_mutex);
msblk->stream.avail_out = 0;
msblk->stream.avail_in = 0;
bytes = length;
do {
if (msblk->stream.avail_in == 0 && k < b) {
avail = min(bytes, msblk->devblksize - offset);
bytes -= avail;
wait_on_buffer(bh[k]);
if (!buffer_uptodate(bh[k]))
goto release_mutex;
if (avail == 0) {
offset = 0;
put_bh(bh[k++]);
continue;
}
msblk->stream.next_in = bh[k]->b_data + offset;
msblk->stream.avail_in = avail;
offset = 0;
}
if (msblk->stream.avail_out == 0 && page < pages) {
msblk->stream.next_out = buffer[page++];
msblk->stream.avail_out = PAGE_CACHE_SIZE;
}
if (!zlib_init) {
zlib_err = zlib_inflateInit(&msblk->stream);
if (zlib_err != Z_OK) {
ERROR("zlib_inflateInit returned"
" unexpected result 0x%x,"
" srclength %d\n", zlib_err,
srclength);
goto release_mutex;
}
zlib_init = 1;
}
zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
if (msblk->stream.avail_in == 0 && k < b)
put_bh(bh[k++]);
} while (zlib_err == Z_OK);
if (zlib_err != Z_STREAM_END) {
ERROR("zlib_inflate error, data probably corrupt\n");
goto release_mutex;
}
zlib_err = zlib_inflateEnd(&msblk->stream);
if (zlib_err != Z_OK) {
ERROR("zlib_inflate error, data probably corrupt\n");
goto release_mutex;
}
length = msblk->stream.total_out;
mutex_unlock(&msblk->read_data_mutex);
length = squashfs_zlib_uncompress(msblk, buffer, bh, b, offset,
length, srclength, pages);
if (length < 0)
goto read_failure;
} else {
/*
* Block is uncompressed.
@@ -255,9 +192,6 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
kfree(bh);
return length;
release_mutex:
mutex_unlock(&msblk->read_data_mutex);
block_release:
for (; k < b; k++)
put_bh(bh[k]);