From 3035123d65714975dcc8527289fe68c7b5d3526f Mon Sep 17 00:00:00 2001 From: Peter Krempa Date: Wed, 17 Sep 2014 15:27:33 +0200 Subject: [PATCH] qemu: save image: Split out checks done only when editing the save img Move them to the single corresponding function rather than having them in the common chunk of code. --- src/qemu/qemu_driver.c | 76 +++++++++++++++++++++++------------------- 1 file changed, 41 insertions(+), 35 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index dd5e971073..ee542bf882 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -5381,10 +5381,22 @@ qemuDomainSaveImageUpdateDef(virQEMUDriverPtr driver, } -/* Return -1 on most failures after raising error, -2 if edit was specified - * but xmlin and state (-1 for no change, 0 for paused, 1 for running) do - * not represent any changes (no error raised), -3 if corrupt image was - * unlinked (no error raised), and opened fd on success. */ +/** + * qemuDomainSaveImageOpen: + * @driver: qemu driver data + * @path: path of the save image + * @ret_def: returns domain definition created from the XML stored in the image + * @ret_header: returns structure filled with data from the image header + * @xmlout: returns the XML from the image file (may be NULL) + * @bypass_cache: bypass cache when opening the file + * @wrapperFd: returns the file wrapper structure + * @open_write: open the file for writing (for updates) + * @unlink_corrupt: remove the image file if it is corrupted + * + * Returns the opened fd of the save image file and fills the apropriate fields + * on success. On error returns -1 on most failures, -3 if corrupt image was + * unlinked (no error raised). + */ static int ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4) qemuDomainSaveImageOpen(virQEMUDriverPtr driver, const char *path, @@ -5393,14 +5405,14 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver, char **xmlout, bool bypass_cache, virFileWrapperFdPtr *wrapperFd, - const char *xmlin, int state, bool edit, + bool open_write, bool unlink_corrupt) { int fd = -1; virQEMUSaveHeader header; char *xml = NULL; virDomainDefPtr def = NULL; - int oflags = edit ? O_RDWR : O_RDONLY; + int oflags = open_write ? O_RDWR : O_RDONLY; virCapsPtr caps = NULL; if (bypass_cache) { @@ -5485,18 +5497,6 @@ qemuDomainSaveImageOpen(virQEMUDriverPtr driver, goto error; } - if (edit && STREQ(xml, xmlin) && - (state < 0 || state == header.was_running)) { - VIR_FREE(xml); - if (VIR_CLOSE(fd) < 0) { - virReportSystemError(errno, _("cannot close file: %s"), path); - goto error; - } - return -2; - } - if (state >= 0) - header.was_running = state; - /* Create a domain from this XML */ if (!(def = virDomainDefParseString(xml, caps, driver->xmlopt, QEMU_EXPECTED_VIRT_TYPES, @@ -5651,21 +5651,15 @@ qemuDomainRestoreFlags(virConnectPtr conn, int ret = -1; virQEMUSaveHeader header; virFileWrapperFdPtr wrapperFd = NULL; - int state = -1; virCheckFlags(VIR_DOMAIN_SAVE_BYPASS_CACHE | VIR_DOMAIN_SAVE_RUNNING | VIR_DOMAIN_SAVE_PAUSED, -1); - if (flags & VIR_DOMAIN_SAVE_RUNNING) - state = 1; - else if (flags & VIR_DOMAIN_SAVE_PAUSED) - state = 0; - fd = qemuDomainSaveImageOpen(driver, path, &def, &header, NULL, (flags & VIR_DOMAIN_SAVE_BYPASS_CACHE) != 0, - &wrapperFd, dxml, state, false, false); + &wrapperFd, false, false); if (fd < 0) goto cleanup; @@ -5688,6 +5682,11 @@ qemuDomainRestoreFlags(virConnectPtr conn, goto cleanup; def = NULL; + if (flags & VIR_DOMAIN_SAVE_RUNNING) + header.was_running = 1; + else if (flags & VIR_DOMAIN_SAVE_PAUSED) + header.was_running = 0; + if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) goto cleanup; @@ -5733,7 +5732,7 @@ qemuDomainSaveImageGetXMLDesc(virConnectPtr conn, const char *path, virCheckFlags(VIR_DOMAIN_XML_SECURE, NULL); fd = qemuDomainSaveImageOpen(driver, path, &def, &header, NULL, - false, NULL, NULL, -1, false, false); + false, NULL, false, false); if (fd < 0) goto cleanup; @@ -5771,22 +5770,30 @@ qemuDomainSaveImageDefineXML(virConnectPtr conn, const char *path, else if (flags & VIR_DOMAIN_SAVE_PAUSED) state = 0; - fd = qemuDomainSaveImageOpen(driver, path, &def, &header, NULL, - false, NULL, dxml, state, true, false); + fd = qemuDomainSaveImageOpen(driver, path, &def, &header, &xml, + false, NULL, true, false); - if (fd < 0) { - /* Check for special case of no change needed. */ - if (fd == -2) - ret = 0; + if (fd < 0) goto cleanup; - } if (virDomainSaveImageDefineXMLEnsureACL(conn, def) < 0) goto cleanup; + if (STREQ(xml, dxml) && + (state < 0 || state == header.was_running)) { + /* no change to the XML */ + ret = 0; + goto cleanup; + } + + if (state >= 0) + header.was_running = state; + if (!(newdef = qemuDomainSaveImageUpdateDef(driver, def, dxml))) goto cleanup; + VIR_FREE(xml); + xml = qemuDomainDefFormatXML(driver, newdef, VIR_DOMAIN_XML_INACTIVE | VIR_DOMAIN_XML_SECURE | @@ -5841,8 +5848,7 @@ qemuDomainObjRestore(virConnectPtr conn, virFileWrapperFdPtr wrapperFd = NULL; fd = qemuDomainSaveImageOpen(driver, path, &def, &header, NULL, - bypass_cache, &wrapperFd, NULL, -1, false, - true); + bypass_cache, &wrapperFd, false, true); if (fd < 0) { if (fd == -3) ret = 1; -- GitLab