debian/patches/pve/0044-block-add-zeroinit.patch

   1 From 8b996ca2740d40027652ea63f52bed8f9271331b Mon Sep 17 00:00:00 2001
   2 From: Wolfgang Bumiller <w.bumiller@proxmox.com>
   3 Date: Thu, 17 Mar 2016 11:33:37 +0100
   4 Subject: [PATCH] block: add the zeroinit block driver filter
   5
   6 ---
   7  block/Makefile.objs |   1 +
   8  block/zeroinit.c    | 216 ++++++++++++++++++++++++++++++++++++++++++++++++++++
   9  2 files changed, 217 insertions(+)
  10  create mode 100644 block/zeroinit.c
  11
  12 diff --git a/block/Makefile.objs b/block/Makefile.objs
  13 index 58ef2ef..5bb55b0 100644
  14 --- a/block/Makefile.objs
  15 +++ b/block/Makefile.objs
  16 @@ -4,6 +4,7 @@ block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
  17  block-obj-y += qed-check.o
  18  block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o
  19  block-obj-y += quorum.o
  20 +block-obj-y += zeroinit.o
  21  block-obj-y += parallels.o blkdebug.o blkverify.o
  22  block-obj-y += block-backend.o snapshot.o qapi.o
  23  block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o
  24 diff --git a/block/zeroinit.c b/block/zeroinit.c
  25 new file mode 100644
  26 index 0000000..04a9bd0
  27 --- /dev/null
  28 +++ b/block/zeroinit.c
  29 @@ -0,0 +1,216 @@
  30 +/*
  31 + * Filter to fake a zero-initialized block device.
  32 + *
  33 + * Copyright (c) 2016 Wolfgang Bumiller <w.bumiller@proxmox.com>
  34 + * Copyright (c) 2016 Proxmox Server Solutions GmbH
  35 + *
  36 + * This work is licensed under the terms of the GNU GPL, version 2 or later.
  37 + * See the COPYING file in the top-level directory.
  38 + */
  39 +
  40 +#include "block/block_int.h"
  41 +#include "qapi/qmp/qdict.h"
  42 +#include "qapi/qmp/qstring.h"
  43 +
  44 +typedef struct {
  45 +    bool has_zero_init;
  46 +    int64_t extents;
  47 +} BDRVZeroinitState;
  48 +
  49 +/* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */
  50 +static void zeroinit_parse_filename(const char *filename, QDict *options,
  51 +                                     Error **errp)
  52 +{
  53 +    QString *raw_path;
  54 +
  55 +    /* Parse the blkverify: prefix */
  56 +    if (!strstart(filename, "zeroinit:", &filename)) {
  57 +        /* There was no prefix; therefore, all options have to be already
  58 +           present in the QDict (except for the filename) */
  59 +        return;
  60 +    }
  61 +
  62 +    raw_path = qstring_from_str(filename);
  63 +    qdict_put(options, "x-next", raw_path);
  64 +}
  65 +
  66 +static QemuOptsList runtime_opts = {
  67 +    .name = "zeroinit",
  68 +    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
  69 +    .desc = {
  70 +        {
  71 +            .name = "x-next",
  72 +            .type = QEMU_OPT_STRING,
  73 +            .help = "[internal use only, will be removed]",
  74 +        },
  75 +        {
  76 +            .name = "x-zeroinit",
  77 +            .type = QEMU_OPT_BOOL,
  78 +            .help = "set has_initialized_zero flag",
  79 +        },
  80 +        { /* end of list */ }
  81 +    },
  82 +};
  83 +
  84 +static int zeroinit_open(BlockDriverState *bs, QDict *options, int flags,
  85 +                          Error **errp)
  86 +{
  87 +    BDRVZeroinitState *s = bs->opaque;
  88 +    QemuOpts *opts;
  89 +    Error *local_err = NULL;
  90 +    int ret;
  91 +
  92 +    s->extents = 0;
  93 +
  94 +    opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
  95 +    qemu_opts_absorb_qdict(opts, options, &local_err);
  96 +    if (local_err) {
  97 +        error_propagate(errp, local_err);
  98 +        ret = -EINVAL;
  99 +        goto fail;
 100 +    }
 101 +
 102 +    /* Open the raw file */
 103 +    bs->file = bdrv_open_child(qemu_opt_get(opts, "x-next"), options, "next",
 104 +                               bs, &child_file, false, &local_err);
 105 +    if (local_err) {
 106 +        ret = -EINVAL;
 107 +        error_propagate(errp, local_err);
 108 +        goto fail;
 109 +    }
 110 +
 111 +    /* set the options */
 112 +    s->has_zero_init = qemu_opt_get_bool(opts, "x-zeroinit", true);
 113 +
 114 +    ret = 0;
 115 +fail:
 116 +    if (ret < 0) {
 117 +        bdrv_unref_child(bs, bs->file);
 118 +    }
 119 +    qemu_opts_del(opts);
 120 +    return ret;
 121 +}
 122 +
 123 +static void zeroinit_close(BlockDriverState *bs)
 124 +{
 125 +    BDRVZeroinitState *s = bs->opaque;
 126 +    (void)s;
 127 +}
 128 +
 129 +static int64_t zeroinit_getlength(BlockDriverState *bs)
 130 +{
 131 +    return bdrv_getlength(bs->file->bs);
 132 +}
 133 +
 134 +static BlockAIOCB *zeroinit_aio_readv(BlockDriverState *bs,
 135 +        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 136 +        BlockCompletionFunc *cb, void *opaque)
 137 +{
 138 +    return bdrv_aio_readv(bs->file->bs, sector_num, qiov, nb_sectors,
 139 +                          cb, opaque);
 140 +}
 141 +
 142 +static int coroutine_fn zeroinit_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 143 +                                                 int nb_sectors, BdrvRequestFlags flags)
 144 +{
 145 +    BDRVZeroinitState *s = bs->opaque;
 146 +    if (sector_num >= s->extents)
 147 +        return 0;
 148 +    return bdrv_write_zeroes(bs->file->bs, sector_num, nb_sectors, flags);
 149 +}
 150 +
 151 +static BlockAIOCB *zeroinit_aio_writev(BlockDriverState *bs,
 152 +        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 153 +        BlockCompletionFunc *cb, void *opaque)
 154 +{
 155 +    BDRVZeroinitState *s = bs->opaque;
 156 +    int64_t extents = sector_num + nb_sectors + 1;
 157 +    if (extents > s->extents)
 158 +        s->extents = extents;
 159 +    return bdrv_aio_writev(bs->file->bs, sector_num, qiov, nb_sectors,
 160 +                           cb, opaque);
 161 +}
 162 +
 163 +static BlockAIOCB *zeroinit_aio_flush(BlockDriverState *bs,
 164 +                                       BlockCompletionFunc *cb,
 165 +                                       void *opaque)
 166 +{
 167 +    return bdrv_aio_flush(bs->file->bs, cb, opaque);
 168 +}
 169 +
 170 +static bool zeroinit_recurse_is_first_non_filter(BlockDriverState *bs,
 171 +                                                  BlockDriverState *candidate)
 172 +{
 173 +    return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate);
 174 +}
 175 +
 176 +static coroutine_fn int zeroinit_co_flush(BlockDriverState *bs)
 177 +{
 178 +    return bdrv_co_flush(bs->file->bs);
 179 +}
 180 +
 181 +static int zeroinit_has_zero_init(BlockDriverState *bs)
 182 +{
 183 +    BDRVZeroinitState *s = bs->opaque;
 184 +    return s->has_zero_init;
 185 +}
 186 +
 187 +static int64_t coroutine_fn zeroinit_co_get_block_status(BlockDriverState *bs,
 188 +                                                         int64_t sector_num,
 189 +                                                         int nb_sectors, int *pnum)
 190 +{
 191 +    return bdrv_get_block_status(bs->file->bs, sector_num, nb_sectors, pnum);
 192 +}
 193 +
 194 +static coroutine_fn BlockAIOCB *zeroinit_aio_discard(BlockDriverState *bs,
 195 +                                                     int64_t sector_num, int nb_sectors,
 196 +                                                     BlockCompletionFunc *cb, void *opaque)
 197 +{
 198 +    return bdrv_aio_discard(bs->file->bs, sector_num, nb_sectors, cb, opaque);
 199 +}
 200 +
 201 +static int zeroinit_truncate(BlockDriverState *bs, int64_t offset)
 202 +{
 203 +    return bdrv_truncate(bs->file->bs, offset);
 204 +}
 205 +
 206 +static int zeroinit_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 207 +{
 208 +    return bdrv_get_info(bs->file->bs, bdi);
 209 +}
 210 +
 211 +static BlockDriver bdrv_zeroinit = {
 212 +    .format_name                      = "zeroinit",
 213 +    .protocol_name                    = "zeroinit",
 214 +    .instance_size                    = sizeof(BDRVZeroinitState),
 215 +
 216 +    .bdrv_parse_filename              = zeroinit_parse_filename,
 217 +    .bdrv_file_open                   = zeroinit_open,
 218 +    .bdrv_close                       = zeroinit_close,
 219 +    .bdrv_getlength                   = zeroinit_getlength,
 220 +    .bdrv_co_flush_to_disk            = zeroinit_co_flush,
 221 +
 222 +    .bdrv_co_write_zeroes             = zeroinit_co_write_zeroes,
 223 +    .bdrv_aio_writev                  = zeroinit_aio_writev,
 224 +    .bdrv_aio_readv                   = zeroinit_aio_readv,
 225 +    .bdrv_aio_flush                   = zeroinit_aio_flush,
 226 +
 227 +    .is_filter                        = true,
 228 +    .bdrv_recurse_is_first_non_filter = zeroinit_recurse_is_first_non_filter,
 229 +
 230 +    .bdrv_has_zero_init = zeroinit_has_zero_init,
 231 +
 232 +    .bdrv_co_get_block_status = zeroinit_co_get_block_status,
 233 +
 234 +    .bdrv_aio_discard = zeroinit_aio_discard,
 235 +
 236 +    .bdrv_truncate = zeroinit_truncate,
 237 +    .bdrv_get_info = zeroinit_get_info,
 238 +};
 239 +
 240 +static void bdrv_zeroinit_init(void)
 241 +{
 242 +    bdrv_register(&bdrv_zeroinit);
 243 +}
 244 +
 245 +block_init(bdrv_zeroinit_init);
 246 --
 247 2.1.4
 248