Tools: hv: Fully support the new KVP verbs in the user level daemon
Now fully support the new KVP messages in the user level daemon. Hyper-V defines multiple persistent pools to which the host can write/read/modify KVP tuples. In this patch we implement a file for each specified pool, where the KVP tuples will be stored in the guest. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan
Greg Kroah-Hartman
Родитель
fa3d5b85c6
Коммит
db425334e5
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@ -39,7 +39,8 @@
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <syslog.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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/*
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* KVP protocol: The user mode component first registers with the
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@ -79,6 +80,250 @@ static char *os_build;
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static char *lic_version;
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static struct utsname uts_buf;
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#define MAX_FILE_NAME 100
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#define ENTRIES_PER_BLOCK 50
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struct kvp_record {
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__u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
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__u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
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};
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struct kvp_file_state {
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int fd;
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int num_blocks;
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struct kvp_record *records;
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int num_records;
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__u8 fname[MAX_FILE_NAME];
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};
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static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
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static void kvp_acquire_lock(int pool)
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{
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struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
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fl.l_pid = getpid();
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if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
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syslog(LOG_ERR, "Failed to acquire the lock pool: %d", pool);
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exit(-1);
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}
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}
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static void kvp_release_lock(int pool)
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{
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struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
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fl.l_pid = getpid();
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if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
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perror("fcntl");
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syslog(LOG_ERR, "Failed to release the lock pool: %d", pool);
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exit(-1);
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}
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}
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static void kvp_update_file(int pool)
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{
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FILE *filep;
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size_t bytes_written;
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/*
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* We are going to write our in-memory registry out to
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* disk; acquire the lock first.
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*/
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kvp_acquire_lock(pool);
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filep = fopen(kvp_file_info[pool].fname, "w");
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if (!filep) {
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kvp_release_lock(pool);
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syslog(LOG_ERR, "Failed to open file, pool: %d", pool);
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exit(-1);
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}
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bytes_written = fwrite(kvp_file_info[pool].records,
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sizeof(struct kvp_record),
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kvp_file_info[pool].num_records, filep);
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fflush(filep);
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kvp_release_lock(pool);
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}
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static int kvp_file_init(void)
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{
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int ret, fd;
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FILE *filep;
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size_t records_read;
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__u8 *fname;
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struct kvp_record *record;
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struct kvp_record *readp;
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int num_blocks;
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int i;
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int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
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if (access("/var/opt/hyperv", F_OK)) {
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if (mkdir("/var/opt/hyperv", S_IRUSR | S_IWUSR | S_IROTH)) {
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syslog(LOG_ERR, " Failed to create /var/opt/hyperv");
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exit(-1);
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}
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}
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for (i = 0; i < KVP_POOL_COUNT; i++) {
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fname = kvp_file_info[i].fname;
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records_read = 0;
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num_blocks = 1;
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sprintf(fname, "/var/opt/hyperv/.kvp_pool_%d", i);
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fd = open(fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IROTH);
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if (fd == -1)
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return 1;
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filep = fopen(fname, "r");
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if (!filep)
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return 1;
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record = malloc(alloc_unit * num_blocks);
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if (record == NULL) {
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fclose(filep);
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return 1;
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}
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while (!feof(filep)) {
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readp = &record[records_read];
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records_read += fread(readp, sizeof(struct kvp_record),
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ENTRIES_PER_BLOCK,
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filep);
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if (!feof(filep)) {
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/*
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* We have more data to read.
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*/
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num_blocks++;
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record = realloc(record, alloc_unit *
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num_blocks);
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if (record == NULL) {
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fclose(filep);
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return 1;
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}
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continue;
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}
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break;
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}
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kvp_file_info[i].fd = fd;
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kvp_file_info[i].num_blocks = num_blocks;
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kvp_file_info[i].records = record;
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kvp_file_info[i].num_records = records_read;
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fclose(filep);
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}
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return 0;
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}
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static int kvp_key_delete(int pool, __u8 *key, int key_size)
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{
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int i;
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int j, k;
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int num_records = kvp_file_info[pool].num_records;
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struct kvp_record *record = kvp_file_info[pool].records;
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for (i = 0; i < num_records; i++) {
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if (memcmp(key, record[i].key, key_size))
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continue;
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/*
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* Found a match; just move the remaining
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* entries up.
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*/
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if (i == num_records) {
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kvp_file_info[pool].num_records--;
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kvp_update_file(pool);
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return 0;
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}
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j = i;
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k = j + 1;
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for (; k < num_records; k++) {
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strcpy(record[j].key, record[k].key);
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strcpy(record[j].value, record[k].value);
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j++;
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}
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kvp_file_info[pool].num_records--;
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kvp_update_file(pool);
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return 0;
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}
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return 1;
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}
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static int kvp_key_add_or_modify(int pool, __u8 *key, int key_size, __u8 *value,
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int value_size)
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{
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int i;
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int j, k;
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int num_records = kvp_file_info[pool].num_records;
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struct kvp_record *record = kvp_file_info[pool].records;
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int num_blocks = kvp_file_info[pool].num_blocks;
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if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
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(value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
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return 1;
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for (i = 0; i < num_records; i++) {
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if (memcmp(key, record[i].key, key_size))
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continue;
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/*
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* Found a match; just update the value -
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* this is the modify case.
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*/
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memcpy(record[i].value, value, value_size);
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kvp_update_file(pool);
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return 0;
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}
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/*
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* Need to add a new entry;
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*/
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if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
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/* Need to allocate a larger array for reg entries. */
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record = realloc(record, sizeof(struct kvp_record) *
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ENTRIES_PER_BLOCK * (num_blocks + 1));
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if (record == NULL)
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return 1;
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kvp_file_info[pool].num_blocks++;
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}
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memcpy(record[i].value, value, value_size);
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memcpy(record[i].key, key, key_size);
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kvp_file_info[pool].records = record;
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kvp_file_info[pool].num_records++;
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kvp_update_file(pool);
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return 0;
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}
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static int kvp_get_value(int pool, __u8 *key, int key_size, __u8 *value,
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int value_size)
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{
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int i;
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int num_records = kvp_file_info[pool].num_records;
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struct kvp_record *record = kvp_file_info[pool].records;
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if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
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(value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
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return 1;
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for (i = 0; i < num_records; i++) {
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if (memcmp(key, record[i].key, key_size))
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continue;
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/*
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* Found a match; just copy the value out.
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*/
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memcpy(value, record[i].value, value_size);
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return 0;
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}
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return 1;
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}
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void kvp_get_os_info(void)
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{
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FILE *file;
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@ -315,6 +560,11 @@ int main(void)
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*/
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kvp_get_os_info();
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if (kvp_file_init()) {
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syslog(LOG_ERR, "Failed to initialize the pools");
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exit(-1);
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}
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fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
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if (fd < 0) {
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syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
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@ -389,9 +639,38 @@ int main(void)
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}
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continue;
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/*
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* The current protocol with the kernel component uses a
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* NULL key name to pass an error condition.
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* For the SET, GET and DELETE operations,
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* use the existing protocol to pass back error.
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*/
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case KVP_OP_SET:
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if (kvp_key_add_or_modify(hv_msg->kvp_hdr.pool,
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hv_msg->body.kvp_set.data.key,
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hv_msg->body.kvp_set.data.key_size,
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hv_msg->body.kvp_set.data.value,
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hv_msg->body.kvp_set.data.value_size))
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strcpy(hv_msg->body.kvp_set.data.key, "");
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break;
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case KVP_OP_GET:
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if (kvp_get_value(hv_msg->kvp_hdr.pool,
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hv_msg->body.kvp_set.data.key,
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hv_msg->body.kvp_set.data.key_size,
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hv_msg->body.kvp_set.data.value,
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hv_msg->body.kvp_set.data.value_size))
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strcpy(hv_msg->body.kvp_set.data.key, "");
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break;
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case KVP_OP_DELETE:
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if (kvp_key_delete(hv_msg->kvp_hdr.pool,
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hv_msg->body.kvp_delete.key,
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hv_msg->body.kvp_delete.key_size))
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strcpy(hv_msg->body.kvp_delete.key, "");
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break;
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default:
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break;
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}
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