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1 | From 35facc3a3549baf4cccaef27afa9c35a25abe91c 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 33/47] block: add the zeroinit block driver filter | |
5 | ||
6 | --- | |
7 | block/Makefile.objs | 1 + | |
8 | block/zeroinit.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++++++++ | |
9 | 2 files changed, 220 insertions(+) | |
10 | create mode 100644 block/zeroinit.c | |
11 | ||
12 | diff --git a/block/Makefile.objs b/block/Makefile.objs | |
13 | index de96f8e..8cdac08 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-y += 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 blkreplay.o | |
22 | block-obj-y += block-backend.o snapshot.o qapi.o | |
23 | block-obj-$(CONFIG_WIN32) += file-win32.o win32-aio.o | |
24 | diff --git a/block/zeroinit.c b/block/zeroinit.c | |
25 | new file mode 100644 | |
26 | index 0000000..0a8c7f9 | |
27 | --- /dev/null | |
28 | +++ b/block/zeroinit.c | |
29 | @@ -0,0 +1,219 @@ | |
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 "qemu/osdep.h" | |
41 | +#include "qapi/error.h" | |
42 | +#include "block/block_int.h" | |
43 | +#include "qapi/qmp/qdict.h" | |
44 | +#include "qapi/qmp/qstring.h" | |
45 | +#include "qemu/cutils.h" | |
46 | + | |
47 | +typedef struct { | |
48 | + bool has_zero_init; | |
49 | + int64_t extents; | |
50 | +} BDRVZeroinitState; | |
51 | + | |
52 | +/* Valid blkverify filenames look like blkverify:path/to/raw_image:path/to/image */ | |
53 | +static void zeroinit_parse_filename(const char *filename, QDict *options, | |
54 | + Error **errp) | |
55 | +{ | |
56 | + QString *raw_path; | |
57 | + | |
58 | + /* Parse the blkverify: prefix */ | |
59 | + if (!strstart(filename, "zeroinit:", &filename)) { | |
60 | + /* There was no prefix; therefore, all options have to be already | |
61 | + present in the QDict (except for the filename) */ | |
62 | + return; | |
63 | + } | |
64 | + | |
65 | + raw_path = qstring_from_str(filename); | |
66 | + qdict_put(options, "x-next", raw_path); | |
67 | +} | |
68 | + | |
69 | +static QemuOptsList runtime_opts = { | |
70 | + .name = "zeroinit", | |
71 | + .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), | |
72 | + .desc = { | |
73 | + { | |
74 | + .name = "x-next", | |
75 | + .type = QEMU_OPT_STRING, | |
76 | + .help = "[internal use only, will be removed]", | |
77 | + }, | |
78 | + { | |
79 | + .name = "x-zeroinit", | |
80 | + .type = QEMU_OPT_BOOL, | |
81 | + .help = "set has_initialized_zero flag", | |
82 | + }, | |
83 | + { /* end of list */ } | |
84 | + }, | |
85 | +}; | |
86 | + | |
87 | +static int zeroinit_open(BlockDriverState *bs, QDict *options, int flags, | |
88 | + Error **errp) | |
89 | +{ | |
90 | + BDRVZeroinitState *s = bs->opaque; | |
91 | + QemuOpts *opts; | |
92 | + Error *local_err = NULL; | |
93 | + int ret; | |
94 | + | |
95 | + s->extents = 0; | |
96 | + | |
97 | + opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); | |
98 | + qemu_opts_absorb_qdict(opts, options, &local_err); | |
99 | + if (local_err) { | |
100 | + error_propagate(errp, local_err); | |
101 | + ret = -EINVAL; | |
102 | + goto fail; | |
103 | + } | |
104 | + | |
105 | + /* Open the raw file */ | |
106 | + bs->file = bdrv_open_child(qemu_opt_get(opts, "x-next"), options, "next", | |
107 | + bs, &child_file, false, &local_err); | |
108 | + if (local_err) { | |
109 | + ret = -EINVAL; | |
110 | + error_propagate(errp, local_err); | |
111 | + goto fail; | |
112 | + } | |
113 | + | |
114 | + /* set the options */ | |
115 | + s->has_zero_init = qemu_opt_get_bool(opts, "x-zeroinit", true); | |
116 | + | |
117 | + ret = 0; | |
118 | +fail: | |
119 | + if (ret < 0) { | |
120 | + bdrv_unref_child(bs, bs->file); | |
121 | + } | |
122 | + qemu_opts_del(opts); | |
123 | + return ret; | |
124 | +} | |
125 | + | |
126 | +static void zeroinit_close(BlockDriverState *bs) | |
127 | +{ | |
128 | + BDRVZeroinitState *s = bs->opaque; | |
129 | + (void)s; | |
130 | +} | |
131 | + | |
132 | +static int64_t zeroinit_getlength(BlockDriverState *bs) | |
133 | +{ | |
134 | + return bdrv_getlength(bs->file->bs); | |
135 | +} | |
136 | + | |
137 | +static BlockAIOCB *zeroinit_aio_readv(BlockDriverState *bs, | |
138 | + int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
139 | + BlockCompletionFunc *cb, void *opaque) | |
140 | +{ | |
141 | + return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, | |
142 | + cb, opaque); | |
143 | +} | |
144 | + | |
145 | +static int coroutine_fn zeroinit_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, | |
146 | + int count, BdrvRequestFlags flags) | |
147 | +{ | |
148 | + BDRVZeroinitState *s = bs->opaque; | |
149 | + if (offset >= s->extents) | |
150 | + return 0; | |
151 | + return bdrv_pwrite_zeroes(bs->file, offset, count, flags); | |
152 | +} | |
153 | + | |
154 | +static BlockAIOCB *zeroinit_aio_writev(BlockDriverState *bs, | |
155 | + int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
156 | + BlockCompletionFunc *cb, void *opaque) | |
157 | +{ | |
158 | + BDRVZeroinitState *s = bs->opaque; | |
159 | + int64_t extents = (sector_num << BDRV_SECTOR_BITS) + ((nb_sectors + 1) << BDRV_SECTOR_BITS); | |
160 | + if (extents > s->extents) | |
161 | + s->extents = extents; | |
162 | + return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, | |
163 | + cb, opaque); | |
164 | +} | |
165 | + | |
166 | +static BlockAIOCB *zeroinit_aio_flush(BlockDriverState *bs, | |
167 | + BlockCompletionFunc *cb, | |
168 | + void *opaque) | |
169 | +{ | |
170 | + return bdrv_aio_flush(bs->file->bs, cb, opaque); | |
171 | +} | |
172 | + | |
173 | +static bool zeroinit_recurse_is_first_non_filter(BlockDriverState *bs, | |
174 | + BlockDriverState *candidate) | |
175 | +{ | |
176 | + return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); | |
177 | +} | |
178 | + | |
179 | +static coroutine_fn int zeroinit_co_flush(BlockDriverState *bs) | |
180 | +{ | |
181 | + return bdrv_co_flush(bs->file->bs); | |
182 | +} | |
183 | + | |
184 | +static int zeroinit_has_zero_init(BlockDriverState *bs) | |
185 | +{ | |
186 | + BDRVZeroinitState *s = bs->opaque; | |
187 | + return s->has_zero_init; | |
188 | +} | |
189 | + | |
190 | +static int64_t coroutine_fn zeroinit_co_get_block_status(BlockDriverState *bs, | |
191 | + int64_t sector_num, | |
192 | + int nb_sectors, int *pnum, | |
193 | + BlockDriverState **file) | |
194 | +{ | |
195 | + return bdrv_get_block_status(bs->file->bs, sector_num, nb_sectors, pnum, file); | |
196 | +} | |
197 | + | |
198 | +static int coroutine_fn zeroinit_co_pdiscard(BlockDriverState *bs, | |
199 | + int64_t offset, int count) | |
200 | +{ | |
201 | + return bdrv_co_pdiscard(bs->file->bs, offset, count); | |
202 | +} | |
203 | + | |
204 | +static int zeroinit_truncate(BlockDriverState *bs, int64_t offset) | |
205 | +{ | |
206 | + return bdrv_truncate(bs->file, offset); | |
207 | +} | |
208 | + | |
209 | +static int zeroinit_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
210 | +{ | |
211 | + return bdrv_get_info(bs->file->bs, bdi); | |
212 | +} | |
213 | + | |
214 | +static BlockDriver bdrv_zeroinit = { | |
215 | + .format_name = "zeroinit", | |
216 | + .protocol_name = "zeroinit", | |
217 | + .instance_size = sizeof(BDRVZeroinitState), | |
218 | + | |
219 | + .bdrv_parse_filename = zeroinit_parse_filename, | |
220 | + .bdrv_file_open = zeroinit_open, | |
221 | + .bdrv_close = zeroinit_close, | |
222 | + .bdrv_getlength = zeroinit_getlength, | |
223 | + .bdrv_co_flush_to_disk = zeroinit_co_flush, | |
224 | + | |
225 | + .bdrv_co_pwrite_zeroes = zeroinit_co_pwrite_zeroes, | |
226 | + .bdrv_aio_writev = zeroinit_aio_writev, | |
227 | + .bdrv_aio_readv = zeroinit_aio_readv, | |
228 | + .bdrv_aio_flush = zeroinit_aio_flush, | |
229 | + | |
230 | + .is_filter = true, | |
231 | + .bdrv_recurse_is_first_non_filter = zeroinit_recurse_is_first_non_filter, | |
232 | + | |
233 | + .bdrv_has_zero_init = zeroinit_has_zero_init, | |
234 | + | |
235 | + .bdrv_co_get_block_status = zeroinit_co_get_block_status, | |
236 | + | |
237 | + .bdrv_co_pdiscard = zeroinit_co_pdiscard, | |
238 | + | |
239 | + .bdrv_truncate = zeroinit_truncate, | |
240 | + .bdrv_get_info = zeroinit_get_info, | |
241 | +}; | |
242 | + | |
243 | +static void bdrv_zeroinit_init(void) | |
244 | +{ | |
245 | + bdrv_register(&bdrv_zeroinit); | |
246 | +} | |
247 | + | |
248 | +block_init(bdrv_zeroinit_init); | |
249 | -- | |
250 | 2.1.4 | |
251 |