New iso_zisofs_ctrl parameters bpt_discard_file_blocks , bpt_discard_free_ratio
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239ba69925
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cc2e0e32a3
@ -52,6 +52,15 @@
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ISO_ZISOFS_V1_LIMIT 1000000
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*/
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/* Minimum and maximum blocks sizes for version 1 and 2 */
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#define ISO_ZISOFS_V1_MIN_LOG2 15
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#define ISO_ZISOFS_V1_MAX_LOG2 17
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#define ISO_ZISOFS_V2_MIN_LOG2 15
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#define ISO_ZISOFS_V2_MAX_LOG2 20
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/* ------------------- Defaults of runtime parameters ------------------ */
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/* Limit for overall count of allocated block pointers:
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2 exp 25 = 256 MiB blocklist buffer = 4 TiB uncompressed at 128 KiB
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*/
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@ -65,23 +74,20 @@ static uint64_t ziso_block_pointer_mgt(uint64_t num, int mode);
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*/
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#define ISO_ZISOFS_MAX_BLOCKS_F 0x2000000
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#ifdef Not_yeT
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/* The number of blocks from which on the block pointer list shall be discarded
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* on iso_stream_close() of a compressing stream. This means that list and size
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* have to be determined again on next ziso_stream_get_size().
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* zisofs v1 with uint32_t pointers could at most have 131072 pointers.
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* Since pointers are now uint64_t, the limit tolerates half of this.
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* on iso_stream_close() of a compressing stream. This means that the pointers
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* have to be determined again on next ziso_stream_compress(), so that adding
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* a zisofs compression filter and writing the compressed stream needs in the
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* sum three read runs of the input stream.
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* <= 0 disables this file size based discarding.
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*/
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#define ISO_ZISOFS_MANY_BLOCKS 65537
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#define ISO_ZISOFS_MANY_BLOCKS 0
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#endif /* Not_yeT */
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/* Minimum and maximum blocks sizes for version 1 and 2 */
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#define ISO_ZISOFS_V1_MIN_LOG2 15
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#define ISO_ZISOFS_V1_MAX_LOG2 17
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#define ISO_ZISOFS_V2_MIN_LOG2 15
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#define ISO_ZISOFS_V2_MAX_LOG2 20
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/* A ratio describing the part of the maximum number of block pointers which
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* shall be kept free by intermediate discarding of block pointers. See above
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* ISO_ZISOFS_MANY_BLOCKS.
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*/
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#define ISO_ZISOFS_KBF_RATIO 0.5
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/* --------------------------- Runtime parameters ------------------------- */
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@ -97,6 +103,9 @@ static int64_t ziso_block_number_target = -1;
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static int64_t ziso_max_total_blocks = ISO_ZISOFS_MAX_BLOCKS_T;
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static int64_t ziso_max_file_blocks = ISO_ZISOFS_MAX_BLOCKS_F;
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static int64_t ziso_many_block_limit = ISO_ZISOFS_MANY_BLOCKS;
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static double ziso_keep_blocks_free_ratio = ISO_ZISOFS_KBF_RATIO;
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static
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int ziso_decide_v2_usage(off_t orig_size)
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@ -328,6 +337,8 @@ typedef struct
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*/
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uint64_t block_pointer_counter;
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uint64_t open_counter;
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int block_pointers_dropped;
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} ZisofsComprStreamData;
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@ -374,6 +385,8 @@ int ziso_stream_close_flag(IsoStream *stream, int flag)
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{
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ZisofsFilterStreamData *data;
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ZisofsComprStreamData *cstd = NULL;
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int block_size, discard;
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double max_blocks, free_blocks;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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@ -382,28 +395,36 @@ int ziso_stream_close_flag(IsoStream *stream, int flag)
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if (stream->class->read == &ziso_stream_compress)
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cstd = (ZisofsComprStreamData *) data;
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#ifdef Not_yeT
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/* >>> zisofs2:
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research whether zisofs streams get opened and closed often */
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if (cstd != NULL) {
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int block_size;
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block_size = (1 << ziso_decide_bs_log2(cstd->orig_size));
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if ((!(flag & 2)) && cstd->open_counter == 1 &&
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cstd->orig_size / block_size >= ISO_ZISOFS_MANY_BLOCKS) {
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if (cstd->block_pointers != NULL) {
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max_blocks = ziso_max_file_blocks;
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if (max_blocks < 1.0)
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max_blocks = 1.0;
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free_blocks = ziso_max_total_blocks -
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ziso_block_pointer_mgt((uint64_t) 0, 3);
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discard = 1;
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if (flag & 2) {
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discard = 0;
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} else if (cstd->block_pointers == NULL) {
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discard = 0;
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} else if (cstd->open_counter != 1) {
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discard = 0;
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} else if (ziso_many_block_limit <= 0 ||
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cstd->orig_size / block_size + !!(cstd->orig_size % block_size)
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+ 1 < (uint64_t) ziso_many_block_limit) {
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if (ziso_keep_blocks_free_ratio < 0.0 ||
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free_blocks / max_blocks >= ziso_keep_blocks_free_ratio)
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discard = 0;
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}
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if (discard) {
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ziso_block_pointer_mgt(cstd->block_pointer_counter, 2);
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free((char *) cstd->block_pointers);
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}
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cstd->block_pointers_dropped = 1;
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cstd->block_pointers = NULL;
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data->size = -1;
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cstd->block_pointer_counter = 0;
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}
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}
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#endif /* Not_yeT */
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if (data->running == NULL) {
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return 1;
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}
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@ -480,6 +501,52 @@ int ziso_stream_open(IsoStream *stream)
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}
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/* @param flag bit0= stream is already open
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bit1= close stream with flag bit1
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*/
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static
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off_t ziso_stream_measure_size(IsoStream *stream, int flag)
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{
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int ret, ret_close;
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off_t count = 0;
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ZisofsFilterStreamData *data;
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char buf[64 * 1024];
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size_t bufsize = 64 * 1024;
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if (stream == NULL)
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return ISO_NULL_POINTER;
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data = stream->data;
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/* Run filter command and count output bytes */
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if (!(flag & 1)) {
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ret = ziso_stream_open_flag(stream, 1);
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if (ret < 0)
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return ret;
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}
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if (stream->class->read == &ziso_stream_uncompress) {
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/* It is enough to read the header part of a compressed file */
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ret = ziso_stream_uncompress(stream, buf, 0);
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count = data->size;
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} else {
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/* The size of the compression result has to be counted */
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while (1) {
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ret = stream->class->read(stream, buf, bufsize);
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if (ret <= 0)
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break;
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count += ret;
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}
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}
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ret_close = ziso_stream_close_flag(stream, flag & 2);
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if (ret < 0)
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return ret;
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if (ret_close < 0)
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return ret_close;
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data->size = count;
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return count;
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}
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static
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int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
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{
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@ -490,7 +557,7 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
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ZisofsComprStreamData *data;
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ZisofsFilterRuntime *rng;
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size_t fill = 0;
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off_t orig_size, next_pt;
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off_t orig_size, next_pt, measure_ret;
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char *cbuf = buf;
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uLongf buf_len;
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uint64_t *copy_base, num_blocks = 0;
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@ -507,6 +574,23 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
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return rng->error_ret;
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}
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if (data->block_pointers_dropped) {
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/* The list was dropped after measurement of compressed size. But this
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* run of the function expects it as already filled with pointer
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* values. So now they have to be re-computed by extra runs of this
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* function in the course of compressed size measurement.
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*/
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data->block_pointers_dropped = 0;
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measure_ret = ziso_stream_measure_size(stream, 1 | 2);
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if (measure_ret < 0)
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return (rng->error_ret = measure_ret);
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/* Stream was closed. Open it again, without any size determination. */
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ret = ziso_stream_open_flag(stream, 1);
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if (ret < 0)
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return ret;
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}
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while (1) {
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if (rng->state == 0) {
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/* Delivering file header */
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@ -554,11 +638,14 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
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if (rng->state == 1) {
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/* Delivering block pointers */;
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if (rng->block_pointer_fill == 0) {
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if (rng->block_pointer_fill == 0 || data->block_pointers == NULL) {
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/* Initialize block pointer writing */
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rng->block_pointer_rpos = 0;
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num_blocks = data->orig_size / rng->block_size
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+ 1 + !!(data->orig_size % rng->block_size);
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if (rng->block_pointer_fill > 0 &&
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(int64_t) num_blocks != rng->block_pointer_fill)
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return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
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rng->block_pointer_fill = num_blocks;
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if (data->block_pointers == NULL) {
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/* On the first pass, create pointer array with all 0s */
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@ -1007,47 +1094,16 @@ int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
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static
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off_t ziso_stream_get_size(IsoStream *stream)
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{
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int ret, ret_close;
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off_t count = 0;
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off_t ret;
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ZisofsFilterStreamData *data;
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char buf[64 * 1024];
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size_t bufsize = 64 * 1024;
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if (stream == NULL) {
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if (stream == NULL)
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return ISO_NULL_POINTER;
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}
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data = stream->data;
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if (data->size >= 0) {
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if (data->size >= 0)
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return data->size;
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}
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/* Run filter command and count output bytes */
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ret = ziso_stream_open_flag(stream, 1);
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if (ret < 0) {
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ret = ziso_stream_measure_size(stream, 0);
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return ret;
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}
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if (stream->class->read == &ziso_stream_uncompress) {
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/* It is enough to read the header part of a compressed file */
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ret = ziso_stream_uncompress(stream, buf, 0);
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count = data->size;
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} else {
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/* The size of the compression result has to be counted */
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while (1) {
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ret = stream->class->read(stream, buf, bufsize);
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if (ret <= 0)
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break;
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count += ret;
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}
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}
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ret_close = ziso_stream_close_flag(stream, 2);
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if (ret < 0)
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return ret;
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if (ret_close < 0)
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return ret_close;
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data->size = count;
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return count;
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}
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@ -1158,6 +1214,11 @@ int ziso_clone_stream(IsoStream *old_stream, IsoStream **new_stream, int flag)
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compr->block_pointers = NULL;
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compr->block_pointer_counter = 0;
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compr->open_counter = 0;
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if (old_compr->block_pointers != NULL ||
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old_compr->block_pointers_dropped)
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compr->block_pointers_dropped = 1;
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else
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compr->block_pointers_dropped = 0;
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}
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old_stream_data = (ZisofsFilterStreamData *) old_stream->data;
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stream_data->orig = new_input_stream;
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@ -1322,6 +1383,7 @@ int ziso_filter_get_filter(FilterContext *filter, IsoStream *original,
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cnstd->block_pointers = NULL;
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cnstd->block_pointer_counter = 0;
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cnstd->open_counter = 0;
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cnstd->block_pointers_dropped = 0;
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str->class = &ziso_stream_compress_class;
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ziso_ref_count++;
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}
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@ -1606,6 +1668,10 @@ int iso_zisofs_set_params(struct iso_zisofs_ctrl *params, int flag)
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ziso_max_file_blocks = params->max_file_blocks;
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if (params->block_number_target != 0)
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ziso_block_number_target = params->block_number_target;
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if (params->bpt_discard_file_blocks != 0)
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ziso_many_block_limit = params->bpt_discard_file_blocks;
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if (params->bpt_discard_free_ratio != 0.0)
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ziso_keep_blocks_free_ratio = params->bpt_discard_free_ratio;
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/* >>> zisofs2: more parameters */
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@ -1638,6 +1704,8 @@ int iso_zisofs_get_params(struct iso_zisofs_ctrl *params, int flag)
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params->current_total_blocks = ziso_block_pointer_mgt((uint64_t) 0, 3);
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params->max_file_blocks = ziso_max_file_blocks;
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params->block_number_target = ziso_block_number_target;
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params->bpt_discard_file_blocks = ziso_many_block_limit;
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params->bpt_discard_free_ratio = ziso_keep_blocks_free_ratio;
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}
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return 1;
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@ -8021,7 +8021,7 @@ struct iso_zisofs_ctrl {
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/* Set to 0 or 1 for this version of the structure
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* 0 = only members up to .block_size_log2 are valid
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* 1 = members up to .block_number_target are valid
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* 1 = members up to .bpt_discard_free_ratio are valid
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* @since 1.5.4
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*/
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int version;
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@ -8042,7 +8042,6 @@ struct iso_zisofs_ctrl {
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/* ------------------- Only valid with .version >= 1 ------------------- */
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/*
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* @since 1.5.4
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* Whether to produce zisofs2 (zisofs version 2) file headers and ZF
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* entries for files which get compressed:
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* 0 = do not produce zisofs2,
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@ -8050,36 +8049,36 @@ struct iso_zisofs_ctrl {
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* This is the default.
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* 1 = zisofs2 is enabled for file size 4 GiB or more
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* 2 = zisofs2 shall be used if zisofs is used at all
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* @since 1.5.4
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*/
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int v2_enabled;
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/*
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* @since 1.5.4
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* Log2 of block size for zisofs2 files. 0 keeps current setting.
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* Allowed are 15 = 32 kiB to 20 = 1024 kiB.
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* @since 1.5.4
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*/
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uint8_t v2_block_size_log2;
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/*
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* @since 1.5.4
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* Maximum overall number of blocklist pointers. 0 keeps current setting.
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* @since 1.5.4
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*/
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uint64_t max_total_blocks;
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/*
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* @since 1.5.4
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* Ignored as input value: Number of allocated zisofs block pointers.
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* @since 1.5.4
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*/
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uint64_t current_total_blocks;
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/*
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* @since 1.5.4
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* Maximum number of blocklist pointers per file. 0 keeps current setting.
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* @since 1.5.4
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*/
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uint64_t max_file_blocks;
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/*
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* @since 1.5.4
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* Number of block pointers of a file, which is considered low enough to
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* justify a reduction of block size. If this number is > 0, then the
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* lowest permissible block size is used, with which not more than the
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@ -8090,10 +8089,34 @@ struct iso_zisofs_ctrl {
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* block size log2 16.
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* -1 disables this automatic block size adjustment.
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* 0 keeps the current setting.
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* @since 1.5.4
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*/
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int64_t block_number_target;
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/* >>> ??? zisofs2: ISO_ZISOFS_MANY_BLOCKS , 0 = default 65537 */
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/*
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* The number of blocks from which on the block pointer list shall be
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* discarded on iso_stream_close() of a compressing stream. This means that
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* the pointers have to be determined again on next ziso_stream_compress(),
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* so that adding a zisofs compression filter and writing the compressed
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* stream needs in the sum three read runs of the input stream.
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* 0 keeps the current setting.
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* < 0 disables this file size based discarding.
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* @since 1.5.4
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*/
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int64_t bpt_discard_file_blocks;
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/*
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* A ratio describing the part of max_file_blocks which shall be kept free
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* by intermediate discarding of block pointers.
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* See above bpt_discard_file_blocks .
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* It makes sense to set this to 1.0 if max_file_blocks is substantially
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* smaller than max_total_blocks.
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* 0.0 keeps the current setting.
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* < 0.0 disables this memory consumption based discarding.
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* @since 1.5.4
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*/
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double bpt_discard_free_ratio;
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/* >>> ??? zisofs2: a limit for number of zisofs2 files in order to keep
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the number of these old kernel warnings bearable:
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