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qemu / qemu / 0e71be1932adfad27d564675f89a468fc8b92b1f
commit0e71be1932adfad27d564675f89a468fc8b92b1f[log] [tgz]
authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>Tue Feb 07 13:27:28 2012 +0000
committerKevin Wolf <kwolf@redhat.com>Thu Feb 09 16:17:50 2012 +0100
tree38557d85c26ec854554dc1a7eef289823104347e
parent6e4f59bd0d69f0a7aa4010b49a5c49a01987b9d8 [diff]
qed: add .bdrv_co_write_zeroes() support

Zero writes are a dedicated interface for writing regions of zeroes into
the image file.  If clusters are not yet allocated it is possible to use
an efficient metadata representation which keeps the image file compact
and does not store individual zero bytes.

Implementing this for the QED image format is fairly straightforward.
The only issue is that when a zero write touches an existing cluster we
have to allocate a bounce buffer and perform a regular write.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2 files changed
tree: 38557d85c26ec854554dc1a7eef289823104347e
  1. audio/
  2. block/
  3. bsd-user/
  4. darwin-user/
  5. default-configs/
  6. docs/
  7. fpu/
  8. fsdev/
  9. gdb-xml/
  10. hw/
  11. include/
  12. libcacard/
  13. linux-headers/
  14. linux-user/
  15. net/
  16. pc-bios/
  17. qapi/
  18. qga/
  19. QMP/
  20. qom/
  21. roms/
  22. scripts/
  23. slirp/
  24. sysconfigs/
  25. target-alpha/
  26. target-arm/
  27. target-cris/
  28. target-i386/
  29. target-lm32/
  30. target-m68k/
  31. target-microblaze/
  32. target-mips/
  33. target-ppc/
  34. target-s390x/
  35. target-sh4/
  36. target-sparc/
  37. target-unicore32/
  38. target-xtensa/
  39. tcg/
  40. tests/
  41. trace/
  42. ui/
  43. .gitignore
  44. .gitmodules
  45. .mailmap
  46. a.out.h
  47. acl.c
  48. acl.h
  49. aes.c
  50. aes.h
  51. aio.c
  52. alpha-dis.c
  53. alpha.ld
  54. arch_init.c
  55. arch_init.h
  56. arm-dis.c
  57. arm-semi.c
  58. arm.ld
  59. async.c
  60. balloon.c
  61. balloon.h
  62. bitmap.c
  63. bitmap.h
  64. bitops.c
  65. bitops.h
  66. block-migration.c
  67. block-migration.h
  68. block.c
  69. block.h
  70. block_int.h
  71. blockdev.c
  72. blockdev.h
  73. bswap.h
  74. bt-host.c
  75. bt-host.h
  76. bt-vhci.c
  77. buffered_file.c
  78. buffered_file.h
  79. cache-utils.c
  80. cache-utils.h
  81. Changelog
  82. check-qdict.c
  83. check-qfloat.c
  84. check-qint.c
  85. check-qjson.c
  86. check-qlist.c
  87. check-qstring.c
  88. cmd.c
  89. cmd.h
  90. CODING_STYLE
  91. compatfd.c
  92. compatfd.h
  93. compiler.h
  94. config.h
  95. configure
  96. console.c
  97. console.h
  98. COPYING
  99. COPYING.LIB
  100. coroutine-gthread.c
  101. coroutine-ucontext.c
  102. coroutine-win32.c
  103. cpu-all.h
  104. cpu-common.h
  105. cpu-defs.h
  106. cpu-exec.c
  107. cpus.c
  108. cpus.h
  109. cris-dis.c
  110. cursor.c
  111. cursor_hidden.xpm
  112. cursor_left_ptr.xpm
  113. cutils.c
  114. def-helper.h
  115. device_tree.c
  116. device_tree.h
  117. dis-asm.h
  118. disas.c
  119. disas.h
  120. dma-helpers.c
  121. dma.h
  122. dyngen-exec.h
  123. elf.h
  124. envlist.c
  125. envlist.h
  126. error.c
  127. error.h
  128. error_int.h
  129. event_notifier.c
  130. event_notifier.h
  131. exec-all.h
  132. exec-memory.h
  133. exec-obsolete.h
  134. exec.c
  135. gdbstub.c
  136. gdbstub.h
  137. gen-icount.h
  138. HACKING
  139. hmp-commands.hx
  140. hmp.c
  141. hmp.h
  142. host-utils.c
  143. host-utils.h
  144. hppa-dis.c
  145. hppa.ld
  146. i386-dis.c
  147. i386.ld
  148. ia64-dis.c
  149. ia64.ld
  150. input.c
  151. int128.h
  152. iohandler.c
  153. ioport-user.c
  154. ioport.c
  155. ioport.h
  156. iorange.h
  157. iov.c
  158. iov.h
  159. json-lexer.c
  160. json-lexer.h
  161. json-parser.c
  162. json-parser.h
  163. json-streamer.c
  164. json-streamer.h
  165. kvm-all.c
  166. kvm-stub.c
  167. kvm.h
  168. libfdt_env.h
  169. LICENSE
  170. linux-aio.c
  171. m68k-dis.c
  172. m68k-semi.c
  173. m68k.ld
  174. main-loop.c
  175. main-loop.h
  176. MAINTAINERS
  177. Makefile
  178. Makefile.dis
  179. Makefile.hw
  180. Makefile.objs
  181. Makefile.target
  182. Makefile.user
  183. memory.c
  184. memory.h
  185. microblaze-dis.c
  186. migration-exec.c
  187. migration-fd.c
  188. migration-tcp.c
  189. migration-unix.c
  190. migration.c
  191. migration.h
  192. mips-dis.c
  193. mips.ld
  194. module.c
  195. module.h
  196. monitor.c
  197. monitor.h
  198. nbd.c
  199. nbd.h
  200. net.c
  201. net.h
  202. notify.c
  203. notify.h
  204. os-posix.c
  205. os-win32.c
  206. osdep.c
  207. osdep.h
  208. oslib-posix.c
  209. oslib-win32.c
  210. path.c
  211. pci-ids.txt
  212. pflib.c
  213. pflib.h
  214. poison.h
  215. posix-aio-compat.c
  216. ppc-dis.c
  217. ppc.ld
  218. ppc64.ld
  219. qapi-schema-guest.json
  220. qapi-schema-test.json
  221. qapi-schema.json
  222. qbool.c
  223. qbool.h
  224. qdict-test-data.txt
  225. qdict.c
  226. qdict.h
  227. qemu-aio.h
  228. qemu-barrier.h
  229. qemu-bridge-helper.c
  230. qemu-char.c
  231. qemu-char.h
  232. qemu-common.h
  233. qemu-config.c
  234. qemu-config.h
  235. qemu-coroutine-int.h
  236. qemu-coroutine-io.c
  237. qemu-coroutine-lock.c
  238. qemu-coroutine-sleep.c
  239. qemu-coroutine.c
  240. qemu-coroutine.h
  241. qemu-doc.texi
  242. qemu-error.c
  243. qemu-error.h
  244. qemu-file.h
  245. qemu-ga.c
  246. qemu-img-cmds.hx
  247. qemu-img.c
  248. qemu-img.texi
  249. qemu-io.c
  250. qemu-lock.h
  251. qemu-log.h
  252. qemu-nbd.c
  253. qemu-nbd.texi
  254. qemu-objects.h
  255. qemu-option.c
  256. qemu-option.h
  257. qemu-options-wrapper.h
  258. qemu-options.h
  259. qemu-options.hx
  260. qemu-os-posix.h
  261. qemu-os-win32.h
  262. qemu-progress.c
  263. qemu-queue.h
  264. qemu-sockets.c
  265. qemu-tech.texi
  266. qemu-thread-posix.c
  267. qemu-thread-posix.h
  268. qemu-thread-win32.c
  269. qemu-thread-win32.h
  270. qemu-thread.h
  271. qemu-timer-common.c
  272. qemu-timer.c
  273. qemu-timer.h
  274. qemu-tls.h
  275. qemu-tool.c
  276. qemu-x509.h
  277. qemu-xattr.h
  278. qemu.sasl
  279. qemu_socket.h
  280. qerror.c
  281. qerror.h
  282. qfloat.c
  283. qfloat.h
  284. qint.c
  285. qint.h
  286. qjson.c
  287. qjson.h
  288. qlist.c
  289. qlist.h
  290. qmp-commands.hx
  291. qmp.c
  292. qobject.h
  293. qstring.c
  294. qstring.h
  295. range.h
  296. readline.c
  297. readline.h
  298. README
  299. rules.mak
  300. s390-dis.c
  301. s390.ld
  302. savevm.c
  303. sh4-dis.c
  304. softmmu-semi.h
  305. softmmu_defs.h
  306. softmmu_exec.h
  307. softmmu_header.h
  308. softmmu_template.h
  309. sparc-dis.c
  310. sparc.ld
  311. sparc64.ld
  312. spice-qemu-char.c
  313. sysemu.h
  314. targphys.h
  315. tcg-runtime.c
  316. tci-dis.c
  317. tci.c
  318. test-coroutine.c
  319. test-qmp-commands.c
  320. test-qmp-input-visitor.c
  321. test-qmp-output-visitor.c
  322. thunk.c
  323. thunk.h
  324. TODO
  325. trace-events
  326. translate-all.c
  327. uboot_image.h
  328. usb-bsd.c
  329. usb-linux.c
  330. usb-redir.c
  331. usb-stub.c
  332. user-exec.c
  333. VERSION
  334. version.rc
  335. vgafont.h
  336. vl.c
  337. vmstate.h
  338. x86_64.ld
  339. xen-all.c
  340. xen-mapcache.c
  341. xen-mapcache.h
  342. xen-stub.c
  343. xtensa-semi.c