qcow2: Add bdrv_discard support

This adds a bdrv_discard function to qcow2 that frees the discarded clusters.
It does not yet pass the discard on to the underlying file system driver, but
the space can be reused by future writes to the image.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
3 files changed
tree: 1aba3562b30cf62ac6a8fdc5f313f4a90e816c88
  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. linux-user/
  12. net/
  13. pc-bios/
  14. QMP/
  15. roms/
  16. scripts/
  17. slirp/
  18. sysconfigs/
  19. target-alpha/
  20. target-arm/
  21. target-cris/
  22. target-i386/
  23. target-m68k/
  24. target-microblaze/
  25. target-mips/
  26. target-ppc/
  27. target-s390x/
  28. target-sh4/
  29. target-sparc/
  30. tcg/
  31. tests/
  32. ui/
  33. .gitignore
  34. .gitmodules
  35. a.out.h
  36. acl.c
  37. acl.h
  38. aes.c
  39. aes.h
  40. aio.c
  41. alpha-dis.c
  42. alpha.ld
  43. arch_init.c
  44. arch_init.h
  45. arm-dis.c
  46. arm-semi.c
  47. arm.ld
  48. async.c
  49. balloon.c
  50. balloon.h
  51. block-migration.c
  52. block-migration.h
  53. block.c
  54. block.h
  55. block_int.h
  56. blockdev.c
  57. blockdev.h
  58. bswap.h
  59. bt-host.c
  60. bt-host.h
  61. bt-vhci.c
  62. buffered_file.c
  63. buffered_file.h
  64. cache-utils.c
  65. cache-utils.h
  66. Changelog
  67. check-qdict.c
  68. check-qfloat.c
  69. check-qint.c
  70. check-qjson.c
  71. check-qlist.c
  72. check-qstring.c
  73. cmd.c
  74. cmd.h
  75. CODING_STYLE
  76. compatfd.c
  77. compatfd.h
  78. config.h
  79. configure
  80. console.c
  81. console.h
  82. COPYING
  83. COPYING.LIB
  84. cpu-all.h
  85. cpu-common.h
  86. cpu-defs.h
  87. cpu-exec.c
  88. cpus.c
  89. cpus.h
  90. cris-dis.c
  91. cursor.c
  92. cursor_hidden.xpm
  93. cursor_left_ptr.xpm
  94. cutils.c
  95. def-helper.h
  96. device_tree.c
  97. device_tree.h
  98. dis-asm.h
  99. disas.c
  100. disas.h
  101. dma-helpers.c
  102. dma.h
  103. dyngen-exec.h
  104. elf.h
  105. envlist.c
  106. envlist.h
  107. exec-all.h
  108. exec.c
  109. gdbstub.c
  110. gdbstub.h
  111. gen-icount.h
  112. HACKING
  113. hmp-commands.hx
  114. host-utils.c
  115. host-utils.h
  116. hpet.h
  117. hppa-dis.c
  118. hppa.ld
  119. i386-dis.c
  120. i386.ld
  121. ia64-dis.c
  122. ia64.ld
  123. input.c
  124. ioport-user.c
  125. ioport.c
  126. ioport.h
  127. iorange.h
  128. iov.c
  129. iov.h
  130. json-lexer.c
  131. json-lexer.h
  132. json-parser.c
  133. json-parser.h
  134. json-streamer.c
  135. json-streamer.h
  136. kvm-all.c
  137. kvm-stub.c
  138. kvm.h
  139. libfdt_env.h
  140. LICENSE
  141. linux-aio.c
  142. m68k-dis.c
  143. m68k-semi.c
  144. m68k.ld
  145. MAINTAINERS
  146. Makefile
  147. Makefile.dis
  148. Makefile.hw
  149. Makefile.objs
  150. Makefile.target
  151. Makefile.user
  152. microblaze-dis.c
  153. migration-exec.c
  154. migration-fd.c
  155. migration-tcp.c
  156. migration-unix.c
  157. migration.c
  158. migration.h
  159. mips-dis.c
  160. mips.ld
  161. module.c
  162. module.h
  163. monitor.c
  164. monitor.h
  165. nbd.c
  166. nbd.h
  167. net-checksum.c
  168. net.c
  169. net.h
  170. notify.c
  171. notify.h
  172. os-posix.c
  173. os-win32.c
  174. osdep.c
  175. osdep.h
  176. oslib-posix.c
  177. oslib-win32.c
  178. path.c
  179. pci-ids.txt
  180. pflib.c
  181. pflib.h
  182. poison.h
  183. posix-aio-compat.c
  184. ppc-dis.c
  185. ppc.ld
  186. ppc64.ld
  187. qbool.c
  188. qbool.h
  189. qdict-test-data.txt
  190. qdict.c
  191. qdict.h
  192. qemu-aio.h
  193. qemu-barrier.h
  194. qemu-char.c
  195. qemu-char.h
  196. qemu-common.h
  197. qemu-config.c
  198. qemu-config.h
  199. qemu-doc.texi
  200. qemu-error.c
  201. qemu-error.h
  202. qemu-img-cmds.hx
  203. qemu-img.c
  204. qemu-img.texi
  205. qemu-io.c
  206. qemu-lock.h
  207. qemu-log.h
  208. qemu-malloc.c
  209. qemu-nbd.c
  210. qemu-nbd.texi
  211. qemu-objects.h
  212. qemu-option.c
  213. qemu-option.h
  214. qemu-options.h
  215. qemu-options.hx
  216. qemu-os-posix.h
  217. qemu-os-win32.h
  218. qemu-queue.h
  219. qemu-sockets.c
  220. qemu-tech.texi
  221. qemu-thread.c
  222. qemu-thread.h
  223. qemu-timer-common.c
  224. qemu-timer.c
  225. qemu-timer.h
  226. qemu-tool.c
  227. qemu-x509.h
  228. qemu.sasl
  229. qemu_socket.h
  230. qerror.c
  231. qerror.h
  232. qfloat.c
  233. qfloat.h
  234. qint.c
  235. qint.h
  236. qjson.c
  237. qjson.h
  238. qlist.c
  239. qlist.h
  240. qmp-commands.hx
  241. qobject.h
  242. qstring.c
  243. qstring.h
  244. range.h
  245. readline.c
  246. readline.h
  247. README
  248. rules.mak
  249. rwhandler.c
  250. rwhandler.h
  251. s390-dis.c
  252. s390.ld
  253. savevm.c
  254. sh4-dis.c
  255. simpletrace.c
  256. simpletrace.h
  257. softmmu-semi.h
  258. softmmu_defs.h
  259. softmmu_exec.h
  260. softmmu_header.h
  261. softmmu_template.h
  262. sparc-dis.c
  263. sparc.ld
  264. sparc64.ld
  265. sysemu.h
  266. targphys.h
  267. tcg-runtime.c
  268. thunk.c
  269. thunk.h
  270. TODO
  271. trace-events
  272. translate-all.c
  273. uboot_image.h
  274. usb-bsd.c
  275. usb-linux.c
  276. usb-stub.c
  277. VERSION
  278. version.rc
  279. vgafont.h
  280. vl.c
  281. x86_64.ld