diff options
Diffstat (limited to 'qga/commands-posix.c')
| -rw-r--r-- | qga/commands-posix.c | 311 |
1 files changed, 1 insertions, 310 deletions
diff --git a/qga/commands-posix.c b/qga/commands-posix.c index 5da60e65ab..2a3bef7445 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -887,316 +887,7 @@ void qmp_guest_set_user_password(const char *username, } #endif /* __linux__ || __FreeBSD__ */ -#ifdef __linux__ -static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf, - int size, Error **errp) -{ - int fd; - int res; - - errno = 0; - fd = openat(dirfd, pathname, O_RDONLY); - if (fd == -1) { - error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); - return; - } - - res = pread(fd, buf, size, 0); - if (res == -1) { - error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname); - } else if (res == 0) { - error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname); - } - close(fd); -} - -static void ga_write_sysfs_file(int dirfd, const char *pathname, - const char *buf, int size, Error **errp) -{ - int fd; - - errno = 0; - fd = openat(dirfd, pathname, O_WRONLY); - if (fd == -1) { - error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname); - return; - } - - if (pwrite(fd, buf, size, 0) == -1) { - error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname); - } - - close(fd); -} - -/* Transfer online/offline status between @mem_blk and the guest system. - * - * On input either @errp or *@errp must be NULL. - * - * In system-to-@mem_blk direction, the following @mem_blk fields are accessed: - * - R: mem_blk->phys_index - * - W: mem_blk->online - * - W: mem_blk->can_offline - * - * In @mem_blk-to-system direction, the following @mem_blk fields are accessed: - * - R: mem_blk->phys_index - * - R: mem_blk->online - *- R: mem_blk->can_offline - * Written members remain unmodified on error. - */ -static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk, - GuestMemoryBlockResponse *result, - Error **errp) -{ - char *dirpath; - int dirfd; - char *status; - Error *local_err = NULL; - - if (!sys2memblk) { - DIR *dp; - - if (!result) { - error_setg(errp, "Internal error, 'result' should not be NULL"); - return; - } - errno = 0; - dp = opendir("/sys/devices/system/memory/"); - /* if there is no 'memory' directory in sysfs, - * we think this VM does not support online/offline memory block, - * any other solution? - */ - if (!dp) { - if (errno == ENOENT) { - result->response = - GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; - } - goto out1; - } - closedir(dp); - } - - dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/", - mem_blk->phys_index); - dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); - if (dirfd == -1) { - if (sys2memblk) { - error_setg_errno(errp, errno, "open(\"%s\")", dirpath); - } else { - if (errno == ENOENT) { - result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND; - } else { - result->response = - GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; - } - } - g_free(dirpath); - goto out1; - } - g_free(dirpath); - - status = g_malloc0(10); - ga_read_sysfs_file(dirfd, "state", status, 10, &local_err); - if (local_err) { - /* treat with sysfs file that not exist in old kernel */ - if (errno == ENOENT) { - error_free(local_err); - if (sys2memblk) { - mem_blk->online = true; - mem_blk->can_offline = false; - } else if (!mem_blk->online) { - result->response = - GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED; - } - } else { - if (sys2memblk) { - error_propagate(errp, local_err); - } else { - error_free(local_err); - result->response = - GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; - } - } - goto out2; - } - - if (sys2memblk) { - char removable = '0'; - - mem_blk->online = (strncmp(status, "online", 6) == 0); - - ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err); - if (local_err) { - /* if no 'removable' file, it doesn't support offline mem blk */ - if (errno == ENOENT) { - error_free(local_err); - mem_blk->can_offline = false; - } else { - error_propagate(errp, local_err); - } - } else { - mem_blk->can_offline = (removable != '0'); - } - } else { - if (mem_blk->online != (strncmp(status, "online", 6) == 0)) { - const char *new_state = mem_blk->online ? "online" : "offline"; - - ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state), - &local_err); - if (local_err) { - error_free(local_err); - result->response = - GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED; - goto out2; - } - - result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS; - result->has_error_code = false; - } /* otherwise pretend successful re-(on|off)-lining */ - } - g_free(status); - close(dirfd); - return; - -out2: - g_free(status); - close(dirfd); -out1: - if (!sys2memblk) { - result->has_error_code = true; - result->error_code = errno; - } -} - -GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp) -{ - GuestMemoryBlockList *head, **tail; - Error *local_err = NULL; - struct dirent *de; - DIR *dp; - - head = NULL; - tail = &head; - - dp = opendir("/sys/devices/system/memory/"); - if (!dp) { - /* it's ok if this happens to be a system that doesn't expose - * memory blocks via sysfs, but otherwise we should report - * an error - */ - if (errno != ENOENT) { - error_setg_errno(errp, errno, "Can't open directory" - "\"/sys/devices/system/memory/\""); - } - return NULL; - } - - /* Note: the phys_index of memory block may be discontinuous, - * this is because a memblk is the unit of the Sparse Memory design, which - * allows discontinuous memory ranges (ex. NUMA), so here we should - * traverse the memory block directory. - */ - while ((de = readdir(dp)) != NULL) { - GuestMemoryBlock *mem_blk; - - if ((strncmp(de->d_name, "memory", 6) != 0) || - !(de->d_type & DT_DIR)) { - continue; - } - - mem_blk = g_malloc0(sizeof *mem_blk); - /* The d_name is "memoryXXX", phys_index is block id, same as XXX */ - mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10); - mem_blk->has_can_offline = true; /* lolspeak ftw */ - transfer_memory_block(mem_blk, true, NULL, &local_err); - if (local_err) { - break; - } - - QAPI_LIST_APPEND(tail, mem_blk); - } - - closedir(dp); - if (local_err == NULL) { - /* there's no guest with zero memory blocks */ - if (head == NULL) { - error_setg(errp, "guest reported zero memory blocks!"); - } - return head; - } - - qapi_free_GuestMemoryBlockList(head); - error_propagate(errp, local_err); - return NULL; -} - -GuestMemoryBlockResponseList * -qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp) -{ - GuestMemoryBlockResponseList *head, **tail; - Error *local_err = NULL; - - head = NULL; - tail = &head; - - while (mem_blks != NULL) { - GuestMemoryBlockResponse *result; - GuestMemoryBlock *current_mem_blk = mem_blks->value; - - result = g_malloc0(sizeof(*result)); - result->phys_index = current_mem_blk->phys_index; - transfer_memory_block(current_mem_blk, false, result, &local_err); - if (local_err) { /* should never happen */ - goto err; - } - - QAPI_LIST_APPEND(tail, result); - mem_blks = mem_blks->next; - } - - return head; -err: - qapi_free_GuestMemoryBlockResponseList(head); - error_propagate(errp, local_err); - return NULL; -} - -GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp) -{ - Error *local_err = NULL; - char *dirpath; - int dirfd; - char *buf; - GuestMemoryBlockInfo *info; - - dirpath = g_strdup_printf("/sys/devices/system/memory/"); - dirfd = open(dirpath, O_RDONLY | O_DIRECTORY); - if (dirfd == -1) { - error_setg_errno(errp, errno, "open(\"%s\")", dirpath); - g_free(dirpath); - return NULL; - } - g_free(dirpath); - - buf = g_malloc0(20); - ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err); - close(dirfd); - if (local_err) { - g_free(buf); - error_propagate(errp, local_err); - return NULL; - } - - info = g_new0(GuestMemoryBlockInfo, 1); - info->size = strtol(buf, NULL, 16); /* the unit is bytes */ - - g_free(buf); - - return info; -} - - -#else /* defined(__linux__) */ +#ifndef __linux__ void qmp_guest_suspend_disk(Error **errp) { |