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qemu / qemu / a22f123ca3d3c09a77af4341ed1fbcc175b54f1d
commita22f123ca3d3c09a77af4341ed1fbcc175b54f1d[log] [tgz]
authorKevin Wolf <kwolf@redhat.com>Fri Aug 26 15:27:13 2011 +0200
committerKevin Wolf <kwolf@redhat.com>Mon Aug 29 14:42:39 2011 +0200
treeb9992c37d4a4645e6282375c669ae1e771206a1c
parentc488c7f649106d09df76f697adccbe6e72520b26 [diff]
qemu-img: Require larger zero areas for sparse handling

By default, require 4k of consecutive zero bytes for qemu-img to make the
output file sparse by not issuing a write request for the zeroed parts. Add an
-S option to allow users to tune this setting.

This helps to avoid situations where a lot of zero sectors and data sectors are
mixed and qemu-img tended to issue many tiny 512 byte writes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
3 files changed
tree: b9992c37d4a4645e6282375c669ae1e771206a1c
  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. libcacard/
  12. linux-headers/
  13. linux-user/
  14. net/
  15. pc-bios/
  16. qapi/
  17. qga/
  18. QMP/
  19. roms/
  20. scripts/
  21. slirp/
  22. sysconfigs/
  23. target-alpha/
  24. target-arm/
  25. target-cris/
  26. target-i386/
  27. target-lm32/
  28. target-m68k/
  29. target-microblaze/
  30. target-mips/
  31. target-ppc/
  32. target-s390x/
  33. target-sh4/
  34. target-sparc/
  35. target-unicore32/
  36. tcg/
  37. tests/
  38. ui/
  39. .gitignore
  40. .gitmodules
  41. a.out.h
  42. acl.c
  43. acl.h
  44. aes.c
  45. aes.h
  46. aio.c
  47. alpha-dis.c
  48. alpha.ld
  49. arch_init.c
  50. arch_init.h
  51. arm-dis.c
  52. arm-semi.c
  53. arm.ld
  54. async.c
  55. balloon.c
  56. balloon.h
  57. bitmap.c
  58. bitmap.h
  59. bitops.c
  60. bitops.h
  61. block-migration.c
  62. block-migration.h
  63. block.c
  64. block.h
  65. block_int.h
  66. blockdev.c
  67. blockdev.h
  68. bswap.h
  69. bt-host.c
  70. bt-host.h
  71. bt-vhci.c
  72. buffered_file.c
  73. buffered_file.h
  74. cache-utils.c
  75. cache-utils.h
  76. Changelog
  77. check-qdict.c
  78. check-qfloat.c
  79. check-qint.c
  80. check-qjson.c
  81. check-qlist.c
  82. check-qstring.c
  83. cmd.c
  84. cmd.h
  85. CODING_STYLE
  86. compatfd.c
  87. compatfd.h
  88. compiler.h
  89. config.h
  90. configure
  91. console.c
  92. console.h
  93. COPYING
  94. COPYING.LIB
  95. coroutine-gthread.c
  96. coroutine-ucontext.c
  97. coroutine-win32.c
  98. cpu-all.h
  99. cpu-common.h
  100. cpu-defs.h
  101. cpu-exec.c
  102. cpus.c
  103. cpus.h
  104. cris-dis.c
  105. cursor.c
  106. cursor_hidden.xpm
  107. cursor_left_ptr.xpm
  108. cutils.c
  109. def-helper.h
  110. device_tree.c
  111. device_tree.h
  112. dis-asm.h
  113. disas.c
  114. disas.h
  115. dma-helpers.c
  116. dma.h
  117. dyngen-exec.h
  118. elf.h
  119. envlist.c
  120. envlist.h
  121. error.c
  122. error.h
  123. error_int.h
  124. exec-all.h
  125. exec-memory.h
  126. exec.c
  127. gdbstub.c
  128. gdbstub.h
  129. gen-icount.h
  130. HACKING
  131. hmp-commands.hx
  132. host-utils.c
  133. host-utils.h
  134. hpet.h
  135. hppa-dis.c
  136. hppa.ld
  137. i386-dis.c
  138. i386.ld
  139. ia64-dis.c
  140. ia64.ld
  141. input.c
  142. iohandler.c
  143. ioport-user.c
  144. ioport.c
  145. ioport.h
  146. iorange.h
  147. iov.c
  148. iov.h
  149. json-lexer.c
  150. json-lexer.h
  151. json-parser.c
  152. json-parser.h
  153. json-streamer.c
  154. json-streamer.h
  155. kvm-all.c
  156. kvm-stub.c
  157. kvm.h
  158. libfdt_env.h
  159. LICENSE
  160. linux-aio.c
  161. m68k-dis.c
  162. m68k-semi.c
  163. m68k.ld
  164. MAINTAINERS
  165. Makefile
  166. Makefile.dis
  167. Makefile.hw
  168. Makefile.objs
  169. Makefile.target
  170. Makefile.user
  171. memory.c
  172. memory.h
  173. microblaze-dis.c
  174. migration-exec.c
  175. migration-fd.c
  176. migration-tcp.c
  177. migration-unix.c
  178. migration.c
  179. migration.h
  180. mips-dis.c
  181. mips.ld
  182. module.c
  183. module.h
  184. monitor.c
  185. monitor.h
  186. nbd.c
  187. nbd.h
  188. net.c
  189. net.h
  190. notify.c
  191. notify.h
  192. os-posix.c
  193. os-win32.c
  194. osdep.c
  195. osdep.h
  196. oslib-posix.c
  197. oslib-win32.c
  198. path.c
  199. pci-ids.txt
  200. pflib.c
  201. pflib.h
  202. poison.h
  203. posix-aio-compat.c
  204. ppc-dis.c
  205. ppc.ld
  206. ppc64.ld
  207. qapi-schema-guest.json
  208. qapi-schema-test.json
  209. qbool.c
  210. qbool.h
  211. qdict-test-data.txt
  212. qdict.c
  213. qdict.h
  214. qemu-aio.h
  215. qemu-barrier.h
  216. qemu-char.c
  217. qemu-char.h
  218. qemu-common.h
  219. qemu-config.c
  220. qemu-config.h
  221. qemu-coroutine-int.h
  222. qemu-coroutine-lock.c
  223. qemu-coroutine.c
  224. qemu-coroutine.h
  225. qemu-doc.texi
  226. qemu-error.c
  227. qemu-error.h
  228. qemu-ga.c
  229. qemu-img-cmds.hx
  230. qemu-img.c
  231. qemu-img.texi
  232. qemu-io.c
  233. qemu-lock.h
  234. qemu-log.h
  235. qemu-nbd.c
  236. qemu-nbd.texi
  237. qemu-objects.h
  238. qemu-option.c
  239. qemu-option.h
  240. qemu-options.h
  241. qemu-options.hx
  242. qemu-os-posix.h
  243. qemu-os-win32.h
  244. qemu-progress.c
  245. qemu-queue.h
  246. qemu-sockets.c
  247. qemu-tech.texi
  248. qemu-thread-posix.c
  249. qemu-thread-posix.h
  250. qemu-thread-win32.c
  251. qemu-thread-win32.h
  252. qemu-thread.h
  253. qemu-timer-common.c
  254. qemu-timer.c
  255. qemu-timer.h
  256. qemu-tool.c
  257. qemu-x509.h
  258. qemu.sasl
  259. qemu_socket.h
  260. qerror.c
  261. qerror.h
  262. qfloat.c
  263. qfloat.h
  264. qint.c
  265. qint.h
  266. qjson.c
  267. qjson.h
  268. qlist.c
  269. qlist.h
  270. qmp-commands.hx
  271. qobject.h
  272. qstring.c
  273. qstring.h
  274. range.h
  275. readline.c
  276. readline.h
  277. README
  278. rules.mak
  279. rwhandler.c
  280. rwhandler.h
  281. s390-dis.c
  282. s390.ld
  283. savevm.c
  284. sh4-dis.c
  285. simpletrace.c
  286. simpletrace.h
  287. softmmu-semi.h
  288. softmmu_defs.h
  289. softmmu_exec.h
  290. softmmu_header.h
  291. softmmu_template.h
  292. sparc-dis.c
  293. sparc.ld
  294. sparc64.ld
  295. spice-qemu-char.c
  296. sysemu.h
  297. targphys.h
  298. tcg-runtime.c
  299. test-coroutine.c
  300. test-qmp-commands.c
  301. test-visitor.c
  302. thunk.c
  303. thunk.h
  304. TODO
  305. trace-events
  306. translate-all.c
  307. uboot_image.h
  308. usb-bsd.c
  309. usb-linux.c
  310. usb-redir.c
  311. usb-stub.c
  312. user-exec.c
  313. VERSION
  314. version.rc
  315. vgafont.h
  316. vl.c
  317. x86_64.ld
  318. xen-all.c
  319. xen-mapcache.c
  320. xen-mapcache.h
  321. xen-stub.c