Annotation of qemu/block.c, revision 1.1.1.19

1.1       root        1: /*
                      2:  * QEMU System Emulator block driver
1.1.1.6   root        3:  *
1.1       root        4:  * Copyright (c) 2003 Fabrice Bellard
1.1.1.6   root        5:  *
1.1       root        6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      7:  * of this software and associated documentation files (the "Software"), to deal
                      8:  * in the Software without restriction, including without limitation the rights
                      9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     10:  * copies of the Software, and to permit persons to whom the Software is
                     11:  * furnished to do so, subject to the following conditions:
                     12:  *
                     13:  * The above copyright notice and this permission notice shall be included in
                     14:  * all copies or substantial portions of the Software.
                     15:  *
                     16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
                     19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     22:  * THE SOFTWARE.
                     23:  */
1.1.1.7   root       24: #include "config-host.h"
1.1.1.6   root       25: #include "qemu-common.h"
1.1.1.19! root       26: #include "trace.h"
1.1.1.13  root       27: #include "monitor.h"
1.1       root       28: #include "block_int.h"
1.1.1.13  root       29: #include "module.h"
1.1.1.14  root       30: #include "qemu-objects.h"
1.1       root       31: 
1.1.1.14  root       32: #ifdef CONFIG_BSD
1.1       root       33: #include <sys/types.h>
                     34: #include <sys/stat.h>
                     35: #include <sys/ioctl.h>
1.1.1.14  root       36: #include <sys/queue.h>
1.1.1.13  root       37: #ifndef __DragonFly__
1.1       root       38: #include <sys/disk.h>
                     39: #endif
1.1.1.13  root       40: #endif
                     41: 
                     42: #ifdef _WIN32
                     43: #include <windows.h>
                     44: #endif
1.1       root       45: 
1.1.1.13  root       46: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
                     47:         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5   root       48:         BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.13  root       49: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
                     50:         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5   root       51:         BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.14  root       52: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
                     53:         BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.18  root       54: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
                     55:         BlockDriverCompletionFunc *cb, void *opaque);
1.1.1.6   root       56: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5   root       57:                         uint8_t *buf, int nb_sectors);
                     58: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                     59:                          const uint8_t *buf, int nb_sectors);
1.1.1.3   root       60: 
1.1.1.18  root       61: static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
                     62:     QTAILQ_HEAD_INITIALIZER(bdrv_states);
1.1.1.7   root       63: 
1.1.1.18  root       64: static QLIST_HEAD(, BlockDriver) bdrv_drivers =
                     65:     QLIST_HEAD_INITIALIZER(bdrv_drivers);
                     66: 
                     67: /* The device to use for VM snapshots */
                     68: static BlockDriverState *bs_snapshots;
1.1       root       69: 
1.1.1.14  root       70: /* If non-zero, use only whitelisted block drivers */
                     71: static int use_bdrv_whitelist;
                     72: 
1.1.1.19! root       73: #ifdef _WIN32
        !            74: static int is_windows_drive_prefix(const char *filename)
        !            75: {
        !            76:     return (((filename[0] >= 'a' && filename[0] <= 'z') ||
        !            77:              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
        !            78:             filename[1] == ':');
        !            79: }
        !            80: 
        !            81: int is_windows_drive(const char *filename)
        !            82: {
        !            83:     if (is_windows_drive_prefix(filename) &&
        !            84:         filename[2] == '\0')
        !            85:         return 1;
        !            86:     if (strstart(filename, "\\\\.\\", NULL) ||
        !            87:         strstart(filename, "//./", NULL))
        !            88:         return 1;
        !            89:     return 0;
        !            90: }
        !            91: #endif
        !            92: 
        !            93: /* check if the path starts with "<protocol>:" */
        !            94: static int path_has_protocol(const char *path)
        !            95: {
        !            96: #ifdef _WIN32
        !            97:     if (is_windows_drive(path) ||
        !            98:         is_windows_drive_prefix(path)) {
        !            99:         return 0;
        !           100:     }
        !           101: #endif
        !           102: 
        !           103:     return strchr(path, ':') != NULL;
        !           104: }
        !           105: 
1.1.1.5   root      106: int path_is_absolute(const char *path)
                    107: {
                    108:     const char *p;
                    109: #ifdef _WIN32
                    110:     /* specific case for names like: "\\.\d:" */
                    111:     if (*path == '/' || *path == '\\')
                    112:         return 1;
                    113: #endif
                    114:     p = strchr(path, ':');
                    115:     if (p)
                    116:         p++;
                    117:     else
                    118:         p = path;
                    119: #ifdef _WIN32
                    120:     return (*p == '/' || *p == '\\');
                    121: #else
                    122:     return (*p == '/');
                    123: #endif
1.1.1.2   root      124: }
                    125: 
1.1.1.5   root      126: /* if filename is absolute, just copy it to dest. Otherwise, build a
                    127:    path to it by considering it is relative to base_path. URL are
                    128:    supported. */
                    129: void path_combine(char *dest, int dest_size,
                    130:                   const char *base_path,
                    131:                   const char *filename)
                    132: {
                    133:     const char *p, *p1;
                    134:     int len;
                    135: 
                    136:     if (dest_size <= 0)
                    137:         return;
                    138:     if (path_is_absolute(filename)) {
                    139:         pstrcpy(dest, dest_size, filename);
                    140:     } else {
                    141:         p = strchr(base_path, ':');
                    142:         if (p)
                    143:             p++;
                    144:         else
                    145:             p = base_path;
                    146:         p1 = strrchr(base_path, '/');
                    147: #ifdef _WIN32
                    148:         {
                    149:             const char *p2;
                    150:             p2 = strrchr(base_path, '\\');
                    151:             if (!p1 || p2 > p1)
                    152:                 p1 = p2;
1.1.1.2   root      153:         }
1.1.1.5   root      154: #endif
                    155:         if (p1)
                    156:             p1++;
                    157:         else
                    158:             p1 = base_path;
                    159:         if (p1 > p)
                    160:             p = p1;
                    161:         len = p - base_path;
                    162:         if (len > dest_size - 1)
                    163:             len = dest_size - 1;
                    164:         memcpy(dest, base_path, len);
                    165:         dest[len] = '\0';
                    166:         pstrcat(dest, dest_size, filename);
1.1.1.2   root      167:     }
                    168: }
                    169: 
1.1.1.13  root      170: void bdrv_register(BlockDriver *bdrv)
1.1       root      171: {
1.1.1.13  root      172:     if (!bdrv->bdrv_aio_readv) {
1.1.1.5   root      173:         /* add AIO emulation layer */
1.1.1.13  root      174:         bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
                    175:         bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
                    176:     } else if (!bdrv->bdrv_read) {
1.1.1.5   root      177:         /* add synchronous IO emulation layer */
                    178:         bdrv->bdrv_read = bdrv_read_em;
                    179:         bdrv->bdrv_write = bdrv_write_em;
                    180:     }
1.1.1.14  root      181: 
                    182:     if (!bdrv->bdrv_aio_flush)
                    183:         bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
                    184: 
1.1.1.18  root      185:     QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
1.1       root      186: }
                    187: 
                    188: /* create a new block device (by default it is empty) */
                    189: BlockDriverState *bdrv_new(const char *device_name)
                    190: {
1.1.1.18  root      191:     BlockDriverState *bs;
1.1       root      192: 
                    193:     bs = qemu_mallocz(sizeof(BlockDriverState));
                    194:     pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
                    195:     if (device_name[0] != '\0') {
1.1.1.18  root      196:         QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
1.1       root      197:     }
                    198:     return bs;
                    199: }
                    200: 
                    201: BlockDriver *bdrv_find_format(const char *format_name)
                    202: {
                    203:     BlockDriver *drv1;
1.1.1.18  root      204:     QLIST_FOREACH(drv1, &bdrv_drivers, list) {
                    205:         if (!strcmp(drv1->format_name, format_name)) {
1.1       root      206:             return drv1;
1.1.1.18  root      207:         }
1.1       root      208:     }
                    209:     return NULL;
                    210: }
                    211: 
1.1.1.14  root      212: static int bdrv_is_whitelisted(BlockDriver *drv)
                    213: {
                    214:     static const char *whitelist[] = {
                    215:         CONFIG_BDRV_WHITELIST
                    216:     };
                    217:     const char **p;
                    218: 
                    219:     if (!whitelist[0])
                    220:         return 1;               /* no whitelist, anything goes */
                    221: 
                    222:     for (p = whitelist; *p; p++) {
                    223:         if (!strcmp(drv->format_name, *p)) {
                    224:             return 1;
                    225:         }
                    226:     }
                    227:     return 0;
                    228: }
                    229: 
                    230: BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
                    231: {
                    232:     BlockDriver *drv = bdrv_find_format(format_name);
                    233:     return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
                    234: }
                    235: 
1.1.1.13  root      236: int bdrv_create(BlockDriver *drv, const char* filename,
                    237:     QEMUOptionParameter *options)
1.1       root      238: {
                    239:     if (!drv->bdrv_create)
                    240:         return -ENOTSUP;
1.1.1.13  root      241: 
                    242:     return drv->bdrv_create(filename, options);
1.1       root      243: }
                    244: 
1.1.1.18  root      245: int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
                    246: {
                    247:     BlockDriver *drv;
                    248: 
                    249:     drv = bdrv_find_protocol(filename);
                    250:     if (drv == NULL) {
1.1.1.19! root      251:         return -ENOENT;
1.1.1.18  root      252:     }
                    253: 
                    254:     return bdrv_create(drv, filename, options);
                    255: }
                    256: 
1.1       root      257: #ifdef _WIN32
1.1.1.2   root      258: void get_tmp_filename(char *filename, int size)
1.1       root      259: {
1.1.1.5   root      260:     char temp_dir[MAX_PATH];
1.1.1.6   root      261: 
1.1.1.5   root      262:     GetTempPath(MAX_PATH, temp_dir);
                    263:     GetTempFileName(temp_dir, "qem", 0, filename);
1.1       root      264: }
                    265: #else
1.1.1.2   root      266: void get_tmp_filename(char *filename, int size)
1.1       root      267: {
                    268:     int fd;
1.1.1.7   root      269:     const char *tmpdir;
1.1       root      270:     /* XXX: race condition possible */
1.1.1.7   root      271:     tmpdir = getenv("TMPDIR");
                    272:     if (!tmpdir)
                    273:         tmpdir = "/tmp";
                    274:     snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
1.1       root      275:     fd = mkstemp(filename);
                    276:     close(fd);
                    277: }
                    278: #endif
                    279: 
1.1.1.13  root      280: /*
                    281:  * Detect host devices. By convention, /dev/cdrom[N] is always
                    282:  * recognized as a host CDROM.
                    283:  */
                    284: static BlockDriver *find_hdev_driver(const char *filename)
                    285: {
                    286:     int score_max = 0, score;
                    287:     BlockDriver *drv = NULL, *d;
                    288: 
1.1.1.18  root      289:     QLIST_FOREACH(d, &bdrv_drivers, list) {
1.1.1.13  root      290:         if (d->bdrv_probe_device) {
                    291:             score = d->bdrv_probe_device(filename);
                    292:             if (score > score_max) {
                    293:                 score_max = score;
                    294:                 drv = d;
                    295:             }
                    296:         }
                    297:     }
                    298: 
                    299:     return drv;
                    300: }
                    301: 
1.1.1.18  root      302: BlockDriver *bdrv_find_protocol(const char *filename)
                    303: {
                    304:     BlockDriver *drv1;
                    305:     char protocol[128];
                    306:     int len;
                    307:     const char *p;
                    308: 
                    309:     /* TODO Drivers without bdrv_file_open must be specified explicitly */
                    310: 
                    311:     /*
                    312:      * XXX(hch): we really should not let host device detection
                    313:      * override an explicit protocol specification, but moving this
                    314:      * later breaks access to device names with colons in them.
                    315:      * Thanks to the brain-dead persistent naming schemes on udev-
                    316:      * based Linux systems those actually are quite common.
                    317:      */
                    318:     drv1 = find_hdev_driver(filename);
                    319:     if (drv1) {
                    320:         return drv1;
                    321:     }
                    322: 
1.1.1.19! root      323:     if (!path_has_protocol(filename)) {
1.1.1.18  root      324:         return bdrv_find_format("file");
                    325:     }
1.1.1.19! root      326:     p = strchr(filename, ':');
        !           327:     assert(p != NULL);
1.1.1.18  root      328:     len = p - filename;
                    329:     if (len > sizeof(protocol) - 1)
                    330:         len = sizeof(protocol) - 1;
                    331:     memcpy(protocol, filename, len);
                    332:     protocol[len] = '\0';
                    333:     QLIST_FOREACH(drv1, &bdrv_drivers, list) {
                    334:         if (drv1->protocol_name &&
                    335:             !strcmp(drv1->protocol_name, protocol)) {
                    336:             return drv1;
                    337:         }
                    338:     }
                    339:     return NULL;
                    340: }
                    341: 
                    342: static int find_image_format(const char *filename, BlockDriver **pdrv)
1.1       root      343: {
1.1.1.5   root      344:     int ret, score, score_max;
1.1       root      345:     BlockDriver *drv1, *drv;
1.1.1.5   root      346:     uint8_t buf[2048];
                    347:     BlockDriverState *bs;
1.1.1.6   root      348: 
1.1.1.18  root      349:     ret = bdrv_file_open(&bs, filename, 0);
                    350:     if (ret < 0) {
                    351:         *pdrv = NULL;
                    352:         return ret;
                    353:     }
                    354: 
                    355:     /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
                    356:     if (bs->sg || !bdrv_is_inserted(bs)) {
                    357:         bdrv_delete(bs);
                    358:         drv = bdrv_find_format("raw");
                    359:         if (!drv) {
                    360:             ret = -ENOENT;
                    361:         }
                    362:         *pdrv = drv;
                    363:         return ret;
                    364:     }
1.1.1.5   root      365: 
                    366:     ret = bdrv_pread(bs, 0, buf, sizeof(buf));
                    367:     bdrv_delete(bs);
                    368:     if (ret < 0) {
1.1.1.18  root      369:         *pdrv = NULL;
                    370:         return ret;
1.1.1.5   root      371:     }
                    372: 
1.1       root      373:     score_max = 0;
1.1.1.18  root      374:     drv = NULL;
                    375:     QLIST_FOREACH(drv1, &bdrv_drivers, list) {
1.1.1.5   root      376:         if (drv1->bdrv_probe) {
                    377:             score = drv1->bdrv_probe(buf, ret, filename);
                    378:             if (score > score_max) {
                    379:                 score_max = score;
                    380:                 drv = drv1;
                    381:             }
1.1       root      382:         }
                    383:     }
1.1.1.18  root      384:     if (!drv) {
                    385:         ret = -ENOENT;
                    386:     }
                    387:     *pdrv = drv;
                    388:     return ret;
                    389: }
                    390: 
                    391: /**
                    392:  * Set the current 'total_sectors' value
                    393:  */
                    394: static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
                    395: {
                    396:     BlockDriver *drv = bs->drv;
                    397: 
                    398:     /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
                    399:     if (bs->sg)
                    400:         return 0;
                    401: 
                    402:     /* query actual device if possible, otherwise just trust the hint */
                    403:     if (drv->bdrv_getlength) {
                    404:         int64_t length = drv->bdrv_getlength(bs);
                    405:         if (length < 0) {
                    406:             return length;
                    407:         }
                    408:         hint = length >> BDRV_SECTOR_BITS;
                    409:     }
                    410: 
                    411:     bs->total_sectors = hint;
                    412:     return 0;
                    413: }
                    414: 
                    415: /*
                    416:  * Common part for opening disk images and files
                    417:  */
                    418: static int bdrv_open_common(BlockDriverState *bs, const char *filename,
                    419:     int flags, BlockDriver *drv)
                    420: {
                    421:     int ret, open_flags;
                    422: 
                    423:     assert(drv != NULL);
                    424: 
                    425:     bs->file = NULL;
                    426:     bs->total_sectors = 0;
                    427:     bs->encrypted = 0;
                    428:     bs->valid_key = 0;
                    429:     bs->open_flags = flags;
                    430:     /* buffer_alignment defaulted to 512, drivers can change this value */
                    431:     bs->buffer_alignment = 512;
                    432: 
                    433:     pstrcpy(bs->filename, sizeof(bs->filename), filename);
                    434: 
                    435:     if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
                    436:         return -ENOTSUP;
                    437:     }
                    438: 
                    439:     bs->drv = drv;
                    440:     bs->opaque = qemu_mallocz(drv->instance_size);
                    441: 
                    442:     /*
                    443:      * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
                    444:      * write cache to the guest.  We do need the fdatasync to flush
                    445:      * out transactions for block allocations, and we maybe have a
                    446:      * volatile write cache in our backing device to deal with.
                    447:      */
                    448:     if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
                    449:         bs->enable_write_cache = 1;
                    450: 
                    451:     /*
                    452:      * Clear flags that are internal to the block layer before opening the
                    453:      * image.
                    454:      */
                    455:     open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
                    456: 
                    457:     /*
                    458:      * Snapshots should be writeable.
                    459:      */
                    460:     if (bs->is_temporary) {
                    461:         open_flags |= BDRV_O_RDWR;
                    462:     }
                    463: 
                    464:     /* Open the image, either directly or using a protocol */
                    465:     if (drv->bdrv_file_open) {
                    466:         ret = drv->bdrv_file_open(bs, filename, open_flags);
                    467:     } else {
                    468:         ret = bdrv_file_open(&bs->file, filename, open_flags);
                    469:         if (ret >= 0) {
                    470:             ret = drv->bdrv_open(bs, open_flags);
                    471:         }
                    472:     }
                    473: 
                    474:     if (ret < 0) {
                    475:         goto free_and_fail;
                    476:     }
                    477: 
                    478:     bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
                    479: 
                    480:     ret = refresh_total_sectors(bs, bs->total_sectors);
                    481:     if (ret < 0) {
                    482:         goto free_and_fail;
                    483:     }
                    484: 
                    485: #ifndef _WIN32
                    486:     if (bs->is_temporary) {
                    487:         unlink(filename);
                    488:     }
                    489: #endif
                    490:     return 0;
                    491: 
                    492: free_and_fail:
                    493:     if (bs->file) {
                    494:         bdrv_delete(bs->file);
                    495:         bs->file = NULL;
                    496:     }
                    497:     qemu_free(bs->opaque);
                    498:     bs->opaque = NULL;
                    499:     bs->drv = NULL;
                    500:     return ret;
1.1       root      501: }
                    502: 
1.1.1.18  root      503: /*
                    504:  * Opens a file using a protocol (file, host_device, nbd, ...)
                    505:  */
1.1.1.5   root      506: int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
1.1       root      507: {
1.1.1.5   root      508:     BlockDriverState *bs;
1.1.1.18  root      509:     BlockDriver *drv;
1.1.1.5   root      510:     int ret;
                    511: 
1.1.1.18  root      512:     drv = bdrv_find_protocol(filename);
                    513:     if (!drv) {
                    514:         return -ENOENT;
                    515:     }
                    516: 
1.1.1.5   root      517:     bs = bdrv_new("");
1.1.1.18  root      518:     ret = bdrv_open_common(bs, filename, flags, drv);
1.1.1.5   root      519:     if (ret < 0) {
                    520:         bdrv_delete(bs);
                    521:         return ret;
1.1.1.2   root      522:     }
1.1.1.7   root      523:     bs->growable = 1;
1.1.1.5   root      524:     *pbs = bs;
                    525:     return 0;
                    526: }
                    527: 
1.1.1.18  root      528: /*
                    529:  * Opens a disk image (raw, qcow2, vmdk, ...)
                    530:  */
                    531: int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
                    532:               BlockDriver *drv)
1.1       root      533: {
1.1.1.18  root      534:     int ret;
1.1       root      535: 
1.1.1.5   root      536:     if (flags & BDRV_O_SNAPSHOT) {
1.1       root      537:         BlockDriverState *bs1;
                    538:         int64_t total_size;
1.1.1.7   root      539:         int is_protocol = 0;
1.1.1.13  root      540:         BlockDriver *bdrv_qcow2;
                    541:         QEMUOptionParameter *options;
1.1.1.18  root      542:         char tmp_filename[PATH_MAX];
                    543:         char backing_filename[PATH_MAX];
1.1.1.6   root      544: 
1.1       root      545:         /* if snapshot, we create a temporary backing file and open it
                    546:            instead of opening 'filename' directly */
                    547: 
                    548:         /* if there is a backing file, use it */
                    549:         bs1 = bdrv_new("");
1.1.1.18  root      550:         ret = bdrv_open(bs1, filename, 0, drv);
1.1.1.8   root      551:         if (ret < 0) {
1.1       root      552:             bdrv_delete(bs1);
1.1.1.8   root      553:             return ret;
1.1       root      554:         }
1.1.1.18  root      555:         total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
1.1.1.7   root      556: 
                    557:         if (bs1->drv && bs1->drv->protocol_name)
                    558:             is_protocol = 1;
                    559: 
1.1       root      560:         bdrv_delete(bs1);
1.1.1.6   root      561: 
1.1       root      562:         get_tmp_filename(tmp_filename, sizeof(tmp_filename));
1.1.1.7   root      563: 
                    564:         /* Real path is meaningless for protocols */
                    565:         if (is_protocol)
                    566:             snprintf(backing_filename, sizeof(backing_filename),
                    567:                      "%s", filename);
1.1.1.18  root      568:         else if (!realpath(filename, backing_filename))
                    569:             return -errno;
1.1.1.7   root      570: 
1.1.1.13  root      571:         bdrv_qcow2 = bdrv_find_format("qcow2");
                    572:         options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
                    573: 
1.1.1.18  root      574:         set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
1.1.1.13  root      575:         set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
                    576:         if (drv) {
                    577:             set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
                    578:                 drv->format_name);
                    579:         }
                    580: 
                    581:         ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
1.1.1.18  root      582:         free_option_parameters(options);
1.1.1.8   root      583:         if (ret < 0) {
                    584:             return ret;
1.1       root      585:         }
1.1.1.13  root      586: 
1.1       root      587:         filename = tmp_filename;
1.1.1.13  root      588:         drv = bdrv_qcow2;
1.1       root      589:         bs->is_temporary = 1;
                    590:     }
                    591: 
1.1.1.18  root      592:     /* Find the right image format driver */
                    593:     if (!drv) {
                    594:         ret = find_image_format(filename, &drv);
1.1.1.8   root      595:     }
1.1.1.18  root      596: 
1.1.1.8   root      597:     if (!drv) {
                    598:         goto unlink_and_fail;
1.1       root      599:     }
1.1.1.14  root      600: 
1.1.1.18  root      601:     /* Open the image */
                    602:     ret = bdrv_open_common(bs, filename, flags, drv);
1.1       root      603:     if (ret < 0) {
1.1.1.18  root      604:         goto unlink_and_fail;
1.1       root      605:     }
1.1.1.18  root      606: 
                    607:     /* If there is a backing file, use it */
                    608:     if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
                    609:         char backing_filename[PATH_MAX];
                    610:         int back_flags;
1.1.1.13  root      611:         BlockDriver *back_drv = NULL;
1.1.1.18  root      612: 
1.1       root      613:         bs->backing_hd = bdrv_new("");
1.1.1.19! root      614: 
        !           615:         if (path_has_protocol(bs->backing_file)) {
        !           616:             pstrcpy(backing_filename, sizeof(backing_filename),
        !           617:                     bs->backing_file);
        !           618:         } else {
        !           619:             path_combine(backing_filename, sizeof(backing_filename),
        !           620:                          filename, bs->backing_file);
        !           621:         }
        !           622: 
        !           623:         if (bs->backing_format[0] != '\0') {
1.1.1.13  root      624:             back_drv = bdrv_find_format(bs->backing_format);
1.1.1.19! root      625:         }
1.1.1.18  root      626: 
                    627:         /* backing files always opened read-only */
                    628:         back_flags =
                    629:             flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
                    630: 
                    631:         ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
1.1.1.8   root      632:         if (ret < 0) {
                    633:             bdrv_close(bs);
                    634:             return ret;
                    635:         }
1.1.1.18  root      636:         if (bs->is_temporary) {
                    637:             bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
                    638:         } else {
                    639:             /* base image inherits from "parent" */
                    640:             bs->backing_hd->keep_read_only = bs->keep_read_only;
                    641:         }
1.1       root      642:     }
                    643: 
1.1.1.13  root      644:     if (!bdrv_key_required(bs)) {
                    645:         /* call the change callback */
                    646:         bs->media_changed = 1;
                    647:         if (bs->change_cb)
1.1.1.19! root      648:             bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1.1.13  root      649:     }
1.1.1.18  root      650: 
1.1       root      651:     return 0;
1.1.1.18  root      652: 
                    653: unlink_and_fail:
                    654:     if (bs->is_temporary) {
                    655:         unlink(filename);
                    656:     }
                    657:     return ret;
1.1       root      658: }
                    659: 
                    660: void bdrv_close(BlockDriverState *bs)
                    661: {
1.1.1.5   root      662:     if (bs->drv) {
1.1.1.18  root      663:         if (bs == bs_snapshots) {
                    664:             bs_snapshots = NULL;
                    665:         }
                    666:         if (bs->backing_hd) {
1.1       root      667:             bdrv_delete(bs->backing_hd);
1.1.1.18  root      668:             bs->backing_hd = NULL;
                    669:         }
1.1       root      670:         bs->drv->bdrv_close(bs);
                    671:         qemu_free(bs->opaque);
                    672: #ifdef _WIN32
                    673:         if (bs->is_temporary) {
                    674:             unlink(bs->filename);
                    675:         }
                    676: #endif
                    677:         bs->opaque = NULL;
                    678:         bs->drv = NULL;
                    679: 
1.1.1.18  root      680:         if (bs->file != NULL) {
                    681:             bdrv_close(bs->file);
                    682:         }
                    683: 
1.1       root      684:         /* call the change callback */
1.1.1.5   root      685:         bs->media_changed = 1;
1.1       root      686:         if (bs->change_cb)
1.1.1.19! root      687:             bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1       root      688:     }
                    689: }
                    690: 
1.1.1.18  root      691: void bdrv_close_all(void)
                    692: {
                    693:     BlockDriverState *bs;
                    694: 
                    695:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                    696:         bdrv_close(bs);
                    697:     }
                    698: }
                    699: 
1.1       root      700: void bdrv_delete(BlockDriverState *bs)
                    701: {
1.1.1.18  root      702:     assert(!bs->peer);
1.1.1.7   root      703: 
1.1.1.18  root      704:     /* remove from list, if necessary */
                    705:     if (bs->device_name[0] != '\0') {
                    706:         QTAILQ_REMOVE(&bdrv_states, bs, list);
                    707:     }
1.1.1.7   root      708: 
1.1       root      709:     bdrv_close(bs);
1.1.1.18  root      710:     if (bs->file != NULL) {
                    711:         bdrv_delete(bs->file);
                    712:     }
                    713: 
                    714:     assert(bs != bs_snapshots);
1.1       root      715:     qemu_free(bs);
                    716: }
                    717: 
1.1.1.18  root      718: int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
                    719: {
                    720:     if (bs->peer) {
                    721:         return -EBUSY;
                    722:     }
                    723:     bs->peer = qdev;
                    724:     return 0;
                    725: }
                    726: 
                    727: void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
                    728: {
                    729:     assert(bs->peer == qdev);
                    730:     bs->peer = NULL;
                    731: }
                    732: 
                    733: DeviceState *bdrv_get_attached(BlockDriverState *bs)
                    734: {
                    735:     return bs->peer;
                    736: }
                    737: 
1.1.1.13  root      738: /*
                    739:  * Run consistency checks on an image
                    740:  *
1.1.1.18  root      741:  * Returns 0 if the check could be completed (it doesn't mean that the image is
                    742:  * free of errors) or -errno when an internal error occured. The results of the
                    743:  * check are stored in res.
1.1.1.13  root      744:  */
1.1.1.18  root      745: int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
1.1.1.13  root      746: {
                    747:     if (bs->drv->bdrv_check == NULL) {
                    748:         return -ENOTSUP;
                    749:     }
                    750: 
1.1.1.18  root      751:     memset(res, 0, sizeof(*res));
                    752:     return bs->drv->bdrv_check(bs, res);
1.1.1.13  root      753: }
                    754: 
1.1.1.19! root      755: #define COMMIT_BUF_SECTORS 2048
        !           756: 
1.1       root      757: /* commit COW file into the raw image */
                    758: int bdrv_commit(BlockDriverState *bs)
                    759: {
1.1.1.5   root      760:     BlockDriver *drv = bs->drv;
1.1.1.18  root      761:     BlockDriver *backing_drv;
1.1.1.19! root      762:     int64_t sector, total_sectors;
        !           763:     int n, ro, open_flags;
1.1.1.18  root      764:     int ret = 0, rw_ret = 0;
1.1.1.19! root      765:     uint8_t *buf;
1.1.1.18  root      766:     char filename[1024];
                    767:     BlockDriverState *bs_rw, *bs_ro;
1.1       root      768: 
1.1.1.5   root      769:     if (!drv)
                    770:         return -ENOMEDIUM;
1.1.1.18  root      771:     
                    772:     if (!bs->backing_hd) {
                    773:         return -ENOTSUP;
                    774:     }
1.1       root      775: 
1.1.1.18  root      776:     if (bs->backing_hd->keep_read_only) {
                    777:         return -EACCES;
1.1       root      778:     }
                    779: 
1.1.1.18  root      780:     backing_drv = bs->backing_hd->drv;
                    781:     ro = bs->backing_hd->read_only;
                    782:     strncpy(filename, bs->backing_hd->filename, sizeof(filename));
                    783:     open_flags =  bs->backing_hd->open_flags;
                    784: 
                    785:     if (ro) {
                    786:         /* re-open as RW */
                    787:         bdrv_delete(bs->backing_hd);
                    788:         bs->backing_hd = NULL;
                    789:         bs_rw = bdrv_new("");
                    790:         rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
                    791:             backing_drv);
                    792:         if (rw_ret < 0) {
                    793:             bdrv_delete(bs_rw);
                    794:             /* try to re-open read-only */
                    795:             bs_ro = bdrv_new("");
                    796:             ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
                    797:                 backing_drv);
                    798:             if (ret < 0) {
                    799:                 bdrv_delete(bs_ro);
                    800:                 /* drive not functional anymore */
                    801:                 bs->drv = NULL;
                    802:                 return ret;
                    803:             }
                    804:             bs->backing_hd = bs_ro;
                    805:             return rw_ret;
                    806:         }
                    807:         bs->backing_hd = bs_rw;
1.1       root      808:     }
                    809: 
1.1.1.14  root      810:     total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
1.1.1.19! root      811:     buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
1.1       root      812: 
1.1.1.19! root      813:     for (sector = 0; sector < total_sectors; sector += n) {
        !           814:         if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
        !           815: 
        !           816:             if (bdrv_read(bs, sector, buf, n) != 0) {
        !           817:                 ret = -EIO;
        !           818:                 goto ro_cleanup;
        !           819:             }
        !           820: 
        !           821:             if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
        !           822:                 ret = -EIO;
        !           823:                 goto ro_cleanup;
        !           824:             }
1.1       root      825:         }
                    826:     }
1.1.1.2   root      827: 
1.1.1.18  root      828:     if (drv->bdrv_make_empty) {
                    829:         ret = drv->bdrv_make_empty(bs);
                    830:         bdrv_flush(bs);
                    831:     }
1.1.1.2   root      832: 
1.1.1.18  root      833:     /*
                    834:      * Make sure all data we wrote to the backing device is actually
                    835:      * stable on disk.
                    836:      */
                    837:     if (bs->backing_hd)
                    838:         bdrv_flush(bs->backing_hd);
                    839: 
                    840: ro_cleanup:
1.1.1.19! root      841:     qemu_free(buf);
1.1.1.18  root      842: 
                    843:     if (ro) {
                    844:         /* re-open as RO */
                    845:         bdrv_delete(bs->backing_hd);
                    846:         bs->backing_hd = NULL;
                    847:         bs_ro = bdrv_new("");
                    848:         ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
                    849:             backing_drv);
                    850:         if (ret < 0) {
                    851:             bdrv_delete(bs_ro);
                    852:             /* drive not functional anymore */
                    853:             bs->drv = NULL;
                    854:             return ret;
                    855:         }
                    856:         bs->backing_hd = bs_ro;
                    857:         bs->backing_hd->keep_read_only = 0;
                    858:     }
                    859: 
                    860:     return ret;
                    861: }
                    862: 
                    863: void bdrv_commit_all(void)
                    864: {
                    865:     BlockDriverState *bs;
                    866: 
                    867:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                    868:         bdrv_commit(bs);
                    869:     }
                    870: }
                    871: 
                    872: /*
                    873:  * Return values:
                    874:  * 0        - success
                    875:  * -EINVAL  - backing format specified, but no file
                    876:  * -ENOSPC  - can't update the backing file because no space is left in the
                    877:  *            image file header
                    878:  * -ENOTSUP - format driver doesn't support changing the backing file
                    879:  */
                    880: int bdrv_change_backing_file(BlockDriverState *bs,
                    881:     const char *backing_file, const char *backing_fmt)
                    882: {
                    883:     BlockDriver *drv = bs->drv;
                    884: 
                    885:     if (drv->bdrv_change_backing_file != NULL) {
                    886:         return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
                    887:     } else {
                    888:         return -ENOTSUP;
                    889:     }
1.1       root      890: }
                    891: 
1.1.1.7   root      892: static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
                    893:                                    size_t size)
                    894: {
                    895:     int64_t len;
                    896: 
                    897:     if (!bdrv_is_inserted(bs))
                    898:         return -ENOMEDIUM;
                    899: 
                    900:     if (bs->growable)
                    901:         return 0;
                    902: 
                    903:     len = bdrv_getlength(bs);
                    904: 
1.1.1.11  root      905:     if (offset < 0)
                    906:         return -EIO;
                    907: 
                    908:     if ((offset > len) || (len - offset < size))
1.1.1.7   root      909:         return -EIO;
                    910: 
                    911:     return 0;
                    912: }
                    913: 
                    914: static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
                    915:                               int nb_sectors)
                    916: {
1.1.1.18  root      917:     return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
                    918:                                    nb_sectors * BDRV_SECTOR_SIZE);
1.1.1.7   root      919: }
                    920: 
1.1.1.5   root      921: /* return < 0 if error. See bdrv_write() for the return codes */
1.1.1.6   root      922: int bdrv_read(BlockDriverState *bs, int64_t sector_num,
1.1       root      923:               uint8_t *buf, int nb_sectors)
                    924: {
                    925:     BlockDriver *drv = bs->drv;
                    926: 
1.1.1.5   root      927:     if (!drv)
                    928:         return -ENOMEDIUM;
1.1.1.7   root      929:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                    930:         return -EIO;
1.1       root      931: 
1.1.1.13  root      932:     return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
1.1       root      933: }
                    934: 
1.1.1.14  root      935: static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
                    936:                              int nb_sectors, int dirty)
                    937: {
                    938:     int64_t start, end;
                    939:     unsigned long val, idx, bit;
                    940: 
                    941:     start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
                    942:     end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
                    943: 
                    944:     for (; start <= end; start++) {
                    945:         idx = start / (sizeof(unsigned long) * 8);
                    946:         bit = start % (sizeof(unsigned long) * 8);
                    947:         val = bs->dirty_bitmap[idx];
                    948:         if (dirty) {
1.1.1.19! root      949:             if (!(val & (1UL << bit))) {
1.1.1.18  root      950:                 bs->dirty_count++;
1.1.1.19! root      951:                 val |= 1UL << bit;
1.1.1.18  root      952:             }
1.1.1.14  root      953:         } else {
1.1.1.19! root      954:             if (val & (1UL << bit)) {
1.1.1.18  root      955:                 bs->dirty_count--;
1.1.1.19! root      956:                 val &= ~(1UL << bit);
1.1.1.18  root      957:             }
1.1.1.14  root      958:         }
                    959:         bs->dirty_bitmap[idx] = val;
                    960:     }
                    961: }
                    962: 
1.1.1.6   root      963: /* Return < 0 if error. Important errors are:
1.1.1.5   root      964:   -EIO         generic I/O error (may happen for all errors)
                    965:   -ENOMEDIUM   No media inserted.
                    966:   -EINVAL      Invalid sector number or nb_sectors
                    967:   -EACCES      Trying to write a read-only device
                    968: */
1.1.1.6   root      969: int bdrv_write(BlockDriverState *bs, int64_t sector_num,
1.1       root      970:                const uint8_t *buf, int nb_sectors)
                    971: {
1.1.1.5   root      972:     BlockDriver *drv = bs->drv;
                    973:     if (!bs->drv)
                    974:         return -ENOMEDIUM;
1.1       root      975:     if (bs->read_only)
1.1.1.5   root      976:         return -EACCES;
1.1.1.7   root      977:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                    978:         return -EIO;
                    979: 
1.1.1.14  root      980:     if (bs->dirty_bitmap) {
                    981:         set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
                    982:     }
                    983: 
1.1.1.18  root      984:     if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
                    985:         bs->wr_highest_sector = sector_num + nb_sectors - 1;
                    986:     }
                    987: 
1.1.1.7   root      988:     return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
1.1       root      989: }
                    990: 
1.1.1.13  root      991: int bdrv_pread(BlockDriverState *bs, int64_t offset,
                    992:                void *buf, int count1)
1.1.1.5   root      993: {
1.1.1.14  root      994:     uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5   root      995:     int len, nb_sectors, count;
                    996:     int64_t sector_num;
1.1.1.15  root      997:     int ret;
1.1.1.5   root      998: 
                    999:     count = count1;
                   1000:     /* first read to align to sector start */
1.1.1.14  root     1001:     len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5   root     1002:     if (len > count)
                   1003:         len = count;
1.1.1.14  root     1004:     sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5   root     1005:     if (len > 0) {
1.1.1.15  root     1006:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1007:             return ret;
1.1.1.14  root     1008:         memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1.1.1.5   root     1009:         count -= len;
                   1010:         if (count == 0)
                   1011:             return count1;
                   1012:         sector_num++;
                   1013:         buf += len;
                   1014:     }
                   1015: 
                   1016:     /* read the sectors "in place" */
1.1.1.14  root     1017:     nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5   root     1018:     if (nb_sectors > 0) {
1.1.1.15  root     1019:         if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
                   1020:             return ret;
1.1.1.5   root     1021:         sector_num += nb_sectors;
1.1.1.14  root     1022:         len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5   root     1023:         buf += len;
                   1024:         count -= len;
                   1025:     }
                   1026: 
                   1027:     /* add data from the last sector */
                   1028:     if (count > 0) {
1.1.1.15  root     1029:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1030:             return ret;
1.1.1.5   root     1031:         memcpy(buf, tmp_buf, count);
                   1032:     }
                   1033:     return count1;
                   1034: }
                   1035: 
1.1.1.13  root     1036: int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                   1037:                 const void *buf, int count1)
1.1.1.5   root     1038: {
1.1.1.14  root     1039:     uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5   root     1040:     int len, nb_sectors, count;
                   1041:     int64_t sector_num;
1.1.1.15  root     1042:     int ret;
1.1.1.5   root     1043: 
                   1044:     count = count1;
                   1045:     /* first write to align to sector start */
1.1.1.14  root     1046:     len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5   root     1047:     if (len > count)
                   1048:         len = count;
1.1.1.14  root     1049:     sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5   root     1050:     if (len > 0) {
1.1.1.15  root     1051:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1052:             return ret;
1.1.1.14  root     1053:         memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1.1.1.15  root     1054:         if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
                   1055:             return ret;
1.1.1.5   root     1056:         count -= len;
                   1057:         if (count == 0)
                   1058:             return count1;
                   1059:         sector_num++;
                   1060:         buf += len;
                   1061:     }
                   1062: 
                   1063:     /* write the sectors "in place" */
1.1.1.14  root     1064:     nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5   root     1065:     if (nb_sectors > 0) {
1.1.1.15  root     1066:         if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
                   1067:             return ret;
1.1.1.5   root     1068:         sector_num += nb_sectors;
1.1.1.14  root     1069:         len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5   root     1070:         buf += len;
                   1071:         count -= len;
                   1072:     }
                   1073: 
                   1074:     /* add data from the last sector */
                   1075:     if (count > 0) {
1.1.1.15  root     1076:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1077:             return ret;
1.1.1.5   root     1078:         memcpy(tmp_buf, buf, count);
1.1.1.15  root     1079:         if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
                   1080:             return ret;
1.1.1.5   root     1081:     }
                   1082:     return count1;
                   1083: }
                   1084: 
1.1.1.17  root     1085: /*
                   1086:  * Writes to the file and ensures that no writes are reordered across this
                   1087:  * request (acts as a barrier)
                   1088:  *
                   1089:  * Returns 0 on success, -errno in error cases.
                   1090:  */
                   1091: int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
                   1092:     const void *buf, int count)
                   1093: {
                   1094:     int ret;
                   1095: 
                   1096:     ret = bdrv_pwrite(bs, offset, buf, count);
                   1097:     if (ret < 0) {
                   1098:         return ret;
                   1099:     }
                   1100: 
                   1101:     /* No flush needed for cache=writethrough, it uses O_DSYNC */
                   1102:     if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
                   1103:         bdrv_flush(bs);
                   1104:     }
                   1105: 
                   1106:     return 0;
                   1107: }
                   1108: 
                   1109: /*
                   1110:  * Writes to the file and ensures that no writes are reordered across this
                   1111:  * request (acts as a barrier)
                   1112:  *
                   1113:  * Returns 0 on success, -errno in error cases.
                   1114:  */
                   1115: int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
                   1116:     const uint8_t *buf, int nb_sectors)
                   1117: {
                   1118:     return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
                   1119:         buf, BDRV_SECTOR_SIZE * nb_sectors);
                   1120: }
                   1121: 
1.1.1.5   root     1122: /**
                   1123:  * Truncate file to 'offset' bytes (needed only for file protocols)
                   1124:  */
                   1125: int bdrv_truncate(BlockDriverState *bs, int64_t offset)
                   1126: {
                   1127:     BlockDriver *drv = bs->drv;
1.1.1.18  root     1128:     int ret;
1.1.1.5   root     1129:     if (!drv)
                   1130:         return -ENOMEDIUM;
                   1131:     if (!drv->bdrv_truncate)
                   1132:         return -ENOTSUP;
1.1.1.14  root     1133:     if (bs->read_only)
                   1134:         return -EACCES;
1.1.1.19! root     1135:     if (bdrv_in_use(bs))
        !          1136:         return -EBUSY;
1.1.1.18  root     1137:     ret = drv->bdrv_truncate(bs, offset);
                   1138:     if (ret == 0) {
                   1139:         ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1.1.1.19! root     1140:         if (bs->change_cb) {
        !          1141:             bs->change_cb(bs->change_opaque, CHANGE_SIZE);
        !          1142:         }
1.1.1.18  root     1143:     }
                   1144:     return ret;
1.1.1.5   root     1145: }
                   1146: 
                   1147: /**
                   1148:  * Length of a file in bytes. Return < 0 if error or unknown.
                   1149:  */
                   1150: int64_t bdrv_getlength(BlockDriverState *bs)
                   1151: {
                   1152:     BlockDriver *drv = bs->drv;
                   1153:     if (!drv)
                   1154:         return -ENOMEDIUM;
1.1.1.18  root     1155: 
                   1156:     /* Fixed size devices use the total_sectors value for speed instead of
                   1157:        issuing a length query (like lseek) on each call.  Also, legacy block
                   1158:        drivers don't provide a bdrv_getlength function and must use
                   1159:        total_sectors. */
                   1160:     if (!bs->growable || !drv->bdrv_getlength) {
1.1.1.14  root     1161:         return bs->total_sectors * BDRV_SECTOR_SIZE;
1.1.1.5   root     1162:     }
                   1163:     return drv->bdrv_getlength(bs);
                   1164: }
                   1165: 
                   1166: /* return 0 as number of sectors if no device present or error */
1.1.1.6   root     1167: void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1.1       root     1168: {
1.1.1.5   root     1169:     int64_t length;
                   1170:     length = bdrv_getlength(bs);
                   1171:     if (length < 0)
                   1172:         length = 0;
                   1173:     else
1.1.1.14  root     1174:         length = length >> BDRV_SECTOR_BITS;
1.1.1.5   root     1175:     *nb_sectors_ptr = length;
1.1       root     1176: }
                   1177: 
1.1.1.7   root     1178: struct partition {
                   1179:         uint8_t boot_ind;           /* 0x80 - active */
                   1180:         uint8_t head;               /* starting head */
                   1181:         uint8_t sector;             /* starting sector */
                   1182:         uint8_t cyl;                /* starting cylinder */
                   1183:         uint8_t sys_ind;            /* What partition type */
                   1184:         uint8_t end_head;           /* end head */
                   1185:         uint8_t end_sector;         /* end sector */
                   1186:         uint8_t end_cyl;            /* end cylinder */
                   1187:         uint32_t start_sect;        /* starting sector counting from 0 */
                   1188:         uint32_t nr_sects;          /* nr of sectors in partition */
                   1189: } __attribute__((packed));
                   1190: 
                   1191: /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
                   1192: static int guess_disk_lchs(BlockDriverState *bs,
                   1193:                            int *pcylinders, int *pheads, int *psectors)
                   1194: {
1.1.1.18  root     1195:     uint8_t buf[BDRV_SECTOR_SIZE];
1.1.1.7   root     1196:     int ret, i, heads, sectors, cylinders;
                   1197:     struct partition *p;
                   1198:     uint32_t nr_sects;
                   1199:     uint64_t nb_sectors;
                   1200: 
                   1201:     bdrv_get_geometry(bs, &nb_sectors);
                   1202: 
                   1203:     ret = bdrv_read(bs, 0, buf, 1);
                   1204:     if (ret < 0)
                   1205:         return -1;
                   1206:     /* test msdos magic */
                   1207:     if (buf[510] != 0x55 || buf[511] != 0xaa)
                   1208:         return -1;
                   1209:     for(i = 0; i < 4; i++) {
                   1210:         p = ((struct partition *)(buf + 0x1be)) + i;
                   1211:         nr_sects = le32_to_cpu(p->nr_sects);
                   1212:         if (nr_sects && p->end_head) {
                   1213:             /* We make the assumption that the partition terminates on
                   1214:                a cylinder boundary */
                   1215:             heads = p->end_head + 1;
                   1216:             sectors = p->end_sector & 63;
                   1217:             if (sectors == 0)
                   1218:                 continue;
                   1219:             cylinders = nb_sectors / (heads * sectors);
                   1220:             if (cylinders < 1 || cylinders > 16383)
                   1221:                 continue;
                   1222:             *pheads = heads;
                   1223:             *psectors = sectors;
                   1224:             *pcylinders = cylinders;
                   1225: #if 0
                   1226:             printf("guessed geometry: LCHS=%d %d %d\n",
                   1227:                    cylinders, heads, sectors);
                   1228: #endif
                   1229:             return 0;
                   1230:         }
                   1231:     }
                   1232:     return -1;
                   1233: }
                   1234: 
                   1235: void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1.1       root     1236: {
1.1.1.7   root     1237:     int translation, lba_detected = 0;
                   1238:     int cylinders, heads, secs;
                   1239:     uint64_t nb_sectors;
                   1240: 
                   1241:     /* if a geometry hint is available, use it */
                   1242:     bdrv_get_geometry(bs, &nb_sectors);
                   1243:     bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
                   1244:     translation = bdrv_get_translation_hint(bs);
                   1245:     if (cylinders != 0) {
                   1246:         *pcyls = cylinders;
                   1247:         *pheads = heads;
                   1248:         *psecs = secs;
                   1249:     } else {
                   1250:         if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
                   1251:             if (heads > 16) {
                   1252:                 /* if heads > 16, it means that a BIOS LBA
                   1253:                    translation was active, so the default
                   1254:                    hardware geometry is OK */
                   1255:                 lba_detected = 1;
                   1256:                 goto default_geometry;
                   1257:             } else {
                   1258:                 *pcyls = cylinders;
                   1259:                 *pheads = heads;
                   1260:                 *psecs = secs;
                   1261:                 /* disable any translation to be in sync with
                   1262:                    the logical geometry */
                   1263:                 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
                   1264:                     bdrv_set_translation_hint(bs,
                   1265:                                               BIOS_ATA_TRANSLATION_NONE);
                   1266:                 }
                   1267:             }
                   1268:         } else {
                   1269:         default_geometry:
                   1270:             /* if no geometry, use a standard physical disk geometry */
                   1271:             cylinders = nb_sectors / (16 * 63);
                   1272: 
                   1273:             if (cylinders > 16383)
                   1274:                 cylinders = 16383;
                   1275:             else if (cylinders < 2)
                   1276:                 cylinders = 2;
                   1277:             *pcyls = cylinders;
                   1278:             *pheads = 16;
                   1279:             *psecs = 63;
                   1280:             if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
                   1281:                 if ((*pcyls * *pheads) <= 131072) {
                   1282:                     bdrv_set_translation_hint(bs,
                   1283:                                               BIOS_ATA_TRANSLATION_LARGE);
                   1284:                 } else {
                   1285:                     bdrv_set_translation_hint(bs,
                   1286:                                               BIOS_ATA_TRANSLATION_LBA);
                   1287:                 }
                   1288:             }
                   1289:         }
                   1290:         bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
                   1291:     }
1.1       root     1292: }
                   1293: 
1.1.1.6   root     1294: void bdrv_set_geometry_hint(BlockDriverState *bs,
1.1       root     1295:                             int cyls, int heads, int secs)
                   1296: {
                   1297:     bs->cyls = cyls;
                   1298:     bs->heads = heads;
                   1299:     bs->secs = secs;
                   1300: }
                   1301: 
                   1302: void bdrv_set_type_hint(BlockDriverState *bs, int type)
                   1303: {
                   1304:     bs->type = type;
                   1305:     bs->removable = ((type == BDRV_TYPE_CDROM ||
                   1306:                       type == BDRV_TYPE_FLOPPY));
                   1307: }
                   1308: 
                   1309: void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
                   1310: {
                   1311:     bs->translation = translation;
                   1312: }
                   1313: 
1.1.1.6   root     1314: void bdrv_get_geometry_hint(BlockDriverState *bs,
1.1       root     1315:                             int *pcyls, int *pheads, int *psecs)
                   1316: {
                   1317:     *pcyls = bs->cyls;
                   1318:     *pheads = bs->heads;
                   1319:     *psecs = bs->secs;
                   1320: }
                   1321: 
                   1322: int bdrv_get_type_hint(BlockDriverState *bs)
                   1323: {
                   1324:     return bs->type;
                   1325: }
                   1326: 
                   1327: int bdrv_get_translation_hint(BlockDriverState *bs)
                   1328: {
                   1329:     return bs->translation;
                   1330: }
                   1331: 
1.1.1.18  root     1332: void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
                   1333:                        BlockErrorAction on_write_error)
                   1334: {
                   1335:     bs->on_read_error = on_read_error;
                   1336:     bs->on_write_error = on_write_error;
                   1337: }
                   1338: 
                   1339: BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
                   1340: {
                   1341:     return is_read ? bs->on_read_error : bs->on_write_error;
                   1342: }
                   1343: 
                   1344: void bdrv_set_removable(BlockDriverState *bs, int removable)
                   1345: {
                   1346:     bs->removable = removable;
                   1347:     if (removable && bs == bs_snapshots) {
                   1348:         bs_snapshots = NULL;
                   1349:     }
                   1350: }
                   1351: 
1.1       root     1352: int bdrv_is_removable(BlockDriverState *bs)
                   1353: {
                   1354:     return bs->removable;
                   1355: }
                   1356: 
                   1357: int bdrv_is_read_only(BlockDriverState *bs)
                   1358: {
                   1359:     return bs->read_only;
                   1360: }
                   1361: 
1.1.1.6   root     1362: int bdrv_is_sg(BlockDriverState *bs)
                   1363: {
                   1364:     return bs->sg;
                   1365: }
                   1366: 
1.1.1.14  root     1367: int bdrv_enable_write_cache(BlockDriverState *bs)
                   1368: {
                   1369:     return bs->enable_write_cache;
                   1370: }
                   1371: 
1.1.1.5   root     1372: /* XXX: no longer used */
1.1.1.6   root     1373: void bdrv_set_change_cb(BlockDriverState *bs,
1.1.1.19! root     1374:                         void (*change_cb)(void *opaque, int reason),
        !          1375:                         void *opaque)
1.1       root     1376: {
                   1377:     bs->change_cb = change_cb;
                   1378:     bs->change_opaque = opaque;
                   1379: }
                   1380: 
                   1381: int bdrv_is_encrypted(BlockDriverState *bs)
                   1382: {
                   1383:     if (bs->backing_hd && bs->backing_hd->encrypted)
                   1384:         return 1;
                   1385:     return bs->encrypted;
                   1386: }
                   1387: 
1.1.1.8   root     1388: int bdrv_key_required(BlockDriverState *bs)
                   1389: {
                   1390:     BlockDriverState *backing_hd = bs->backing_hd;
                   1391: 
                   1392:     if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
                   1393:         return 1;
                   1394:     return (bs->encrypted && !bs->valid_key);
                   1395: }
                   1396: 
1.1       root     1397: int bdrv_set_key(BlockDriverState *bs, const char *key)
                   1398: {
                   1399:     int ret;
                   1400:     if (bs->backing_hd && bs->backing_hd->encrypted) {
                   1401:         ret = bdrv_set_key(bs->backing_hd, key);
                   1402:         if (ret < 0)
                   1403:             return ret;
                   1404:         if (!bs->encrypted)
                   1405:             return 0;
                   1406:     }
1.1.1.18  root     1407:     if (!bs->encrypted) {
                   1408:         return -EINVAL;
                   1409:     } else if (!bs->drv || !bs->drv->bdrv_set_key) {
                   1410:         return -ENOMEDIUM;
                   1411:     }
1.1.1.8   root     1412:     ret = bs->drv->bdrv_set_key(bs, key);
1.1.1.13  root     1413:     if (ret < 0) {
                   1414:         bs->valid_key = 0;
                   1415:     } else if (!bs->valid_key) {
                   1416:         bs->valid_key = 1;
                   1417:         /* call the change callback now, we skipped it on open */
                   1418:         bs->media_changed = 1;
                   1419:         if (bs->change_cb)
1.1.1.19! root     1420:             bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1.1.13  root     1421:     }
1.1.1.8   root     1422:     return ret;
1.1       root     1423: }
                   1424: 
                   1425: void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
                   1426: {
1.1.1.5   root     1427:     if (!bs->drv) {
1.1       root     1428:         buf[0] = '\0';
                   1429:     } else {
                   1430:         pstrcpy(buf, buf_size, bs->drv->format_name);
                   1431:     }
                   1432: }
                   1433: 
1.1.1.6   root     1434: void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1.1       root     1435:                          void *opaque)
                   1436: {
                   1437:     BlockDriver *drv;
                   1438: 
1.1.1.18  root     1439:     QLIST_FOREACH(drv, &bdrv_drivers, list) {
1.1       root     1440:         it(opaque, drv->format_name);
                   1441:     }
                   1442: }
                   1443: 
                   1444: BlockDriverState *bdrv_find(const char *name)
                   1445: {
                   1446:     BlockDriverState *bs;
                   1447: 
1.1.1.18  root     1448:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                   1449:         if (!strcmp(name, bs->device_name)) {
1.1       root     1450:             return bs;
1.1.1.18  root     1451:         }
1.1       root     1452:     }
                   1453:     return NULL;
                   1454: }
                   1455: 
1.1.1.18  root     1456: BlockDriverState *bdrv_next(BlockDriverState *bs)
                   1457: {
                   1458:     if (!bs) {
                   1459:         return QTAILQ_FIRST(&bdrv_states);
                   1460:     }
                   1461:     return QTAILQ_NEXT(bs, list);
                   1462: }
                   1463: 
1.1.1.8   root     1464: void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1.1       root     1465: {
                   1466:     BlockDriverState *bs;
                   1467: 
1.1.1.18  root     1468:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.8   root     1469:         it(opaque, bs);
1.1       root     1470:     }
                   1471: }
                   1472: 
                   1473: const char *bdrv_get_device_name(BlockDriverState *bs)
                   1474: {
                   1475:     return bs->device_name;
                   1476: }
                   1477: 
1.1.1.19! root     1478: int bdrv_flush(BlockDriverState *bs)
1.1.1.4   root     1479: {
1.1.1.18  root     1480:     if (bs->open_flags & BDRV_O_NO_FLUSH) {
1.1.1.19! root     1481:         return 0;
        !          1482:     }
        !          1483: 
        !          1484:     if (bs->drv && bs->drv->bdrv_flush) {
        !          1485:         return bs->drv->bdrv_flush(bs);
1.1.1.18  root     1486:     }
                   1487: 
1.1.1.19! root     1488:     /*
        !          1489:      * Some block drivers always operate in either writethrough or unsafe mode
        !          1490:      * and don't support bdrv_flush therefore. Usually qemu doesn't know how
        !          1491:      * the server works (because the behaviour is hardcoded or depends on
        !          1492:      * server-side configuration), so we can't ensure that everything is safe
        !          1493:      * on disk. Returning an error doesn't work because that would break guests
        !          1494:      * even if the server operates in writethrough mode.
        !          1495:      *
        !          1496:      * Let's hope the user knows what he's doing.
        !          1497:      */
        !          1498:     return 0;
1.1.1.4   root     1499: }
                   1500: 
1.1.1.7   root     1501: void bdrv_flush_all(void)
                   1502: {
                   1503:     BlockDriverState *bs;
                   1504: 
1.1.1.18  root     1505:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                   1506:         if (bs->drv && !bdrv_is_read_only(bs) &&
                   1507:             (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1.1.1.7   root     1508:             bdrv_flush(bs);
1.1.1.18  root     1509:         }
                   1510:     }
                   1511: }
                   1512: 
                   1513: int bdrv_has_zero_init(BlockDriverState *bs)
                   1514: {
                   1515:     assert(bs->drv);
                   1516: 
                   1517:     if (bs->drv->bdrv_has_zero_init) {
                   1518:         return bs->drv->bdrv_has_zero_init(bs);
                   1519:     }
                   1520: 
                   1521:     return 1;
1.1.1.7   root     1522: }
                   1523: 
1.1.1.19! root     1524: int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
        !          1525: {
        !          1526:     if (!bs->drv) {
        !          1527:         return -ENOMEDIUM;
        !          1528:     }
        !          1529:     if (!bs->drv->bdrv_discard) {
        !          1530:         return 0;
        !          1531:     }
        !          1532:     return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
        !          1533: }
        !          1534: 
1.1.1.7   root     1535: /*
                   1536:  * Returns true iff the specified sector is present in the disk image. Drivers
                   1537:  * not implementing the functionality are assumed to not support backing files,
                   1538:  * hence all their sectors are reported as allocated.
                   1539:  *
                   1540:  * 'pnum' is set to the number of sectors (including and immediately following
                   1541:  * the specified sector) that are known to be in the same
                   1542:  * allocated/unallocated state.
                   1543:  *
                   1544:  * 'nb_sectors' is the max value 'pnum' should be set to.
                   1545:  */
                   1546: int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
                   1547:        int *pnum)
                   1548: {
                   1549:     int64_t n;
                   1550:     if (!bs->drv->bdrv_is_allocated) {
                   1551:         if (sector_num >= bs->total_sectors) {
                   1552:             *pnum = 0;
                   1553:             return 0;
                   1554:         }
                   1555:         n = bs->total_sectors - sector_num;
                   1556:         *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
                   1557:         return 1;
                   1558:     }
                   1559:     return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
                   1560: }
                   1561: 
1.1.1.18  root     1562: void bdrv_mon_event(const BlockDriverState *bdrv,
                   1563:                     BlockMonEventAction action, int is_read)
                   1564: {
                   1565:     QObject *data;
                   1566:     const char *action_str;
                   1567: 
                   1568:     switch (action) {
                   1569:     case BDRV_ACTION_REPORT:
                   1570:         action_str = "report";
                   1571:         break;
                   1572:     case BDRV_ACTION_IGNORE:
                   1573:         action_str = "ignore";
                   1574:         break;
                   1575:     case BDRV_ACTION_STOP:
                   1576:         action_str = "stop";
                   1577:         break;
                   1578:     default:
                   1579:         abort();
                   1580:     }
                   1581: 
                   1582:     data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
                   1583:                               bdrv->device_name,
                   1584:                               action_str,
                   1585:                               is_read ? "read" : "write");
                   1586:     monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
                   1587: 
                   1588:     qobject_decref(data);
                   1589: }
                   1590: 
1.1.1.14  root     1591: static void bdrv_print_dict(QObject *obj, void *opaque)
1.1       root     1592: {
1.1.1.14  root     1593:     QDict *bs_dict;
                   1594:     Monitor *mon = opaque;
                   1595: 
                   1596:     bs_dict = qobject_to_qdict(obj);
                   1597: 
                   1598:     monitor_printf(mon, "%s: type=%s removable=%d",
                   1599:                         qdict_get_str(bs_dict, "device"),
                   1600:                         qdict_get_str(bs_dict, "type"),
                   1601:                         qdict_get_bool(bs_dict, "removable"));
                   1602: 
                   1603:     if (qdict_get_bool(bs_dict, "removable")) {
                   1604:         monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
                   1605:     }
                   1606: 
                   1607:     if (qdict_haskey(bs_dict, "inserted")) {
                   1608:         QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
                   1609: 
                   1610:         monitor_printf(mon, " file=");
                   1611:         monitor_print_filename(mon, qdict_get_str(qdict, "file"));
                   1612:         if (qdict_haskey(qdict, "backing_file")) {
                   1613:             monitor_printf(mon, " backing_file=");
                   1614:             monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
                   1615:         }
                   1616:         monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
                   1617:                             qdict_get_bool(qdict, "ro"),
                   1618:                             qdict_get_str(qdict, "drv"),
                   1619:                             qdict_get_bool(qdict, "encrypted"));
                   1620:     } else {
                   1621:         monitor_printf(mon, " [not inserted]");
                   1622:     }
                   1623: 
                   1624:     monitor_printf(mon, "\n");
                   1625: }
                   1626: 
                   1627: void bdrv_info_print(Monitor *mon, const QObject *data)
                   1628: {
                   1629:     qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
                   1630: }
                   1631: 
                   1632: void bdrv_info(Monitor *mon, QObject **ret_data)
                   1633: {
                   1634:     QList *bs_list;
1.1       root     1635:     BlockDriverState *bs;
                   1636: 
1.1.1.14  root     1637:     bs_list = qlist_new();
                   1638: 
1.1.1.18  root     1639:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.14  root     1640:         QObject *bs_obj;
                   1641:         const char *type = "unknown";
                   1642: 
1.1       root     1643:         switch(bs->type) {
                   1644:         case BDRV_TYPE_HD:
1.1.1.14  root     1645:             type = "hd";
1.1       root     1646:             break;
                   1647:         case BDRV_TYPE_CDROM:
1.1.1.14  root     1648:             type = "cdrom";
1.1       root     1649:             break;
                   1650:         case BDRV_TYPE_FLOPPY:
1.1.1.14  root     1651:             type = "floppy";
1.1       root     1652:             break;
                   1653:         }
1.1.1.14  root     1654: 
                   1655:         bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
                   1656:                                     "'removable': %i, 'locked': %i }",
                   1657:                                     bs->device_name, type, bs->removable,
                   1658:                                     bs->locked);
                   1659: 
1.1.1.5   root     1660:         if (bs->drv) {
1.1.1.14  root     1661:             QObject *obj;
                   1662:             QDict *bs_dict = qobject_to_qdict(bs_obj);
                   1663: 
                   1664:             obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
                   1665:                                      "'encrypted': %i }",
                   1666:                                      bs->filename, bs->read_only,
                   1667:                                      bs->drv->format_name,
                   1668:                                      bdrv_is_encrypted(bs));
1.1.1.5   root     1669:             if (bs->backing_file[0] != '\0') {
1.1.1.14  root     1670:                 QDict *qdict = qobject_to_qdict(obj);
                   1671:                 qdict_put(qdict, "backing_file",
                   1672:                           qstring_from_str(bs->backing_file));
1.1.1.13  root     1673:             }
1.1.1.14  root     1674: 
                   1675:             qdict_put_obj(bs_dict, "inserted", obj);
1.1       root     1676:         }
1.1.1.14  root     1677:         qlist_append_obj(bs_list, bs_obj);
1.1       root     1678:     }
1.1.1.14  root     1679: 
                   1680:     *ret_data = QOBJECT(bs_list);
                   1681: }
                   1682: 
                   1683: static void bdrv_stats_iter(QObject *data, void *opaque)
                   1684: {
                   1685:     QDict *qdict;
                   1686:     Monitor *mon = opaque;
                   1687: 
                   1688:     qdict = qobject_to_qdict(data);
                   1689:     monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
                   1690: 
                   1691:     qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
                   1692:     monitor_printf(mon, " rd_bytes=%" PRId64
                   1693:                         " wr_bytes=%" PRId64
                   1694:                         " rd_operations=%" PRId64
                   1695:                         " wr_operations=%" PRId64
                   1696:                         "\n",
                   1697:                         qdict_get_int(qdict, "rd_bytes"),
                   1698:                         qdict_get_int(qdict, "wr_bytes"),
                   1699:                         qdict_get_int(qdict, "rd_operations"),
                   1700:                         qdict_get_int(qdict, "wr_operations"));
                   1701: }
                   1702: 
                   1703: void bdrv_stats_print(Monitor *mon, const QObject *data)
                   1704: {
                   1705:     qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1.1       root     1706: }
                   1707: 
1.1.1.18  root     1708: static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
                   1709: {
                   1710:     QObject *res;
                   1711:     QDict *dict;
                   1712: 
                   1713:     res = qobject_from_jsonf("{ 'stats': {"
                   1714:                              "'rd_bytes': %" PRId64 ","
                   1715:                              "'wr_bytes': %" PRId64 ","
                   1716:                              "'rd_operations': %" PRId64 ","
                   1717:                              "'wr_operations': %" PRId64 ","
                   1718:                              "'wr_highest_offset': %" PRId64
                   1719:                              "} }",
                   1720:                              bs->rd_bytes, bs->wr_bytes,
                   1721:                              bs->rd_ops, bs->wr_ops,
                   1722:                              bs->wr_highest_sector *
                   1723:                              (uint64_t)BDRV_SECTOR_SIZE);
                   1724:     dict  = qobject_to_qdict(res);
                   1725: 
                   1726:     if (*bs->device_name) {
                   1727:         qdict_put(dict, "device", qstring_from_str(bs->device_name));
                   1728:     }
                   1729: 
                   1730:     if (bs->file) {
                   1731:         QObject *parent = bdrv_info_stats_bs(bs->file);
                   1732:         qdict_put_obj(dict, "parent", parent);
                   1733:     }
                   1734: 
                   1735:     return res;
                   1736: }
                   1737: 
1.1.1.14  root     1738: void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1.1.1.6   root     1739: {
1.1.1.14  root     1740:     QObject *obj;
                   1741:     QList *devices;
1.1.1.6   root     1742:     BlockDriverState *bs;
                   1743: 
1.1.1.14  root     1744:     devices = qlist_new();
                   1745: 
1.1.1.18  root     1746:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                   1747:         obj = bdrv_info_stats_bs(bs);
1.1.1.14  root     1748:         qlist_append_obj(devices, obj);
1.1.1.6   root     1749:     }
1.1.1.14  root     1750: 
                   1751:     *ret_data = QOBJECT(devices);
1.1.1.6   root     1752: }
                   1753: 
1.1.1.8   root     1754: const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
                   1755: {
                   1756:     if (bs->backing_hd && bs->backing_hd->encrypted)
                   1757:         return bs->backing_file;
                   1758:     else if (bs->encrypted)
                   1759:         return bs->filename;
                   1760:     else
                   1761:         return NULL;
                   1762: }
                   1763: 
1.1.1.6   root     1764: void bdrv_get_backing_filename(BlockDriverState *bs,
1.1.1.5   root     1765:                                char *filename, int filename_size)
                   1766: {
1.1.1.18  root     1767:     if (!bs->backing_file) {
1.1.1.5   root     1768:         pstrcpy(filename, filename_size, "");
                   1769:     } else {
                   1770:         pstrcpy(filename, filename_size, bs->backing_file);
                   1771:     }
                   1772: }
                   1773: 
1.1.1.6   root     1774: int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1.1.1.5   root     1775:                           const uint8_t *buf, int nb_sectors)
                   1776: {
                   1777:     BlockDriver *drv = bs->drv;
                   1778:     if (!drv)
                   1779:         return -ENOMEDIUM;
                   1780:     if (!drv->bdrv_write_compressed)
                   1781:         return -ENOTSUP;
1.1.1.11  root     1782:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                   1783:         return -EIO;
1.1.1.14  root     1784: 
                   1785:     if (bs->dirty_bitmap) {
                   1786:         set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
                   1787:     }
                   1788: 
1.1.1.5   root     1789:     return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
                   1790: }
1.1.1.6   root     1791: 
1.1.1.5   root     1792: int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
                   1793: {
                   1794:     BlockDriver *drv = bs->drv;
                   1795:     if (!drv)
                   1796:         return -ENOMEDIUM;
                   1797:     if (!drv->bdrv_get_info)
                   1798:         return -ENOTSUP;
                   1799:     memset(bdi, 0, sizeof(*bdi));
                   1800:     return drv->bdrv_get_info(bs, bdi);
                   1801: }
                   1802: 
1.1.1.13  root     1803: int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
                   1804:                       int64_t pos, int size)
1.1.1.9   root     1805: {
                   1806:     BlockDriver *drv = bs->drv;
                   1807:     if (!drv)
                   1808:         return -ENOMEDIUM;
1.1.1.18  root     1809:     if (drv->bdrv_save_vmstate)
                   1810:         return drv->bdrv_save_vmstate(bs, buf, pos, size);
                   1811:     if (bs->file)
                   1812:         return bdrv_save_vmstate(bs->file, buf, pos, size);
                   1813:     return -ENOTSUP;
1.1.1.9   root     1814: }
                   1815: 
1.1.1.13  root     1816: int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
                   1817:                       int64_t pos, int size)
1.1.1.9   root     1818: {
                   1819:     BlockDriver *drv = bs->drv;
                   1820:     if (!drv)
                   1821:         return -ENOMEDIUM;
1.1.1.18  root     1822:     if (drv->bdrv_load_vmstate)
                   1823:         return drv->bdrv_load_vmstate(bs, buf, pos, size);
                   1824:     if (bs->file)
                   1825:         return bdrv_load_vmstate(bs->file, buf, pos, size);
                   1826:     return -ENOTSUP;
                   1827: }
                   1828: 
                   1829: void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
                   1830: {
                   1831:     BlockDriver *drv = bs->drv;
                   1832: 
                   1833:     if (!drv || !drv->bdrv_debug_event) {
                   1834:         return;
                   1835:     }
                   1836: 
                   1837:     return drv->bdrv_debug_event(bs, event);
                   1838: 
1.1.1.9   root     1839: }
                   1840: 
1.1       root     1841: /**************************************************************/
1.1.1.5   root     1842: /* handling of snapshots */
1.1       root     1843: 
1.1.1.18  root     1844: int bdrv_can_snapshot(BlockDriverState *bs)
                   1845: {
                   1846:     BlockDriver *drv = bs->drv;
                   1847:     if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
                   1848:         return 0;
                   1849:     }
                   1850: 
                   1851:     if (!drv->bdrv_snapshot_create) {
                   1852:         if (bs->file != NULL) {
                   1853:             return bdrv_can_snapshot(bs->file);
                   1854:         }
                   1855:         return 0;
                   1856:     }
                   1857: 
                   1858:     return 1;
                   1859: }
                   1860: 
                   1861: int bdrv_is_snapshot(BlockDriverState *bs)
                   1862: {
                   1863:     return !!(bs->open_flags & BDRV_O_SNAPSHOT);
                   1864: }
                   1865: 
                   1866: BlockDriverState *bdrv_snapshots(void)
                   1867: {
                   1868:     BlockDriverState *bs;
                   1869: 
                   1870:     if (bs_snapshots) {
                   1871:         return bs_snapshots;
                   1872:     }
                   1873: 
                   1874:     bs = NULL;
                   1875:     while ((bs = bdrv_next(bs))) {
                   1876:         if (bdrv_can_snapshot(bs)) {
                   1877:             bs_snapshots = bs;
                   1878:             return bs;
                   1879:         }
                   1880:     }
                   1881:     return NULL;
                   1882: }
                   1883: 
1.1.1.6   root     1884: int bdrv_snapshot_create(BlockDriverState *bs,
1.1.1.5   root     1885:                          QEMUSnapshotInfo *sn_info)
                   1886: {
                   1887:     BlockDriver *drv = bs->drv;
                   1888:     if (!drv)
                   1889:         return -ENOMEDIUM;
1.1.1.18  root     1890:     if (drv->bdrv_snapshot_create)
                   1891:         return drv->bdrv_snapshot_create(bs, sn_info);
                   1892:     if (bs->file)
                   1893:         return bdrv_snapshot_create(bs->file, sn_info);
                   1894:     return -ENOTSUP;
1.1.1.5   root     1895: }
1.1       root     1896: 
1.1.1.6   root     1897: int bdrv_snapshot_goto(BlockDriverState *bs,
1.1.1.5   root     1898:                        const char *snapshot_id)
1.1       root     1899: {
1.1.1.5   root     1900:     BlockDriver *drv = bs->drv;
1.1.1.18  root     1901:     int ret, open_ret;
                   1902: 
1.1.1.5   root     1903:     if (!drv)
                   1904:         return -ENOMEDIUM;
1.1.1.18  root     1905:     if (drv->bdrv_snapshot_goto)
                   1906:         return drv->bdrv_snapshot_goto(bs, snapshot_id);
                   1907: 
                   1908:     if (bs->file) {
                   1909:         drv->bdrv_close(bs);
                   1910:         ret = bdrv_snapshot_goto(bs->file, snapshot_id);
                   1911:         open_ret = drv->bdrv_open(bs, bs->open_flags);
                   1912:         if (open_ret < 0) {
                   1913:             bdrv_delete(bs->file);
                   1914:             bs->drv = NULL;
                   1915:             return open_ret;
                   1916:         }
                   1917:         return ret;
                   1918:     }
                   1919: 
                   1920:     return -ENOTSUP;
1.1       root     1921: }
                   1922: 
1.1.1.5   root     1923: int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1.1       root     1924: {
1.1.1.5   root     1925:     BlockDriver *drv = bs->drv;
                   1926:     if (!drv)
                   1927:         return -ENOMEDIUM;
1.1.1.18  root     1928:     if (drv->bdrv_snapshot_delete)
                   1929:         return drv->bdrv_snapshot_delete(bs, snapshot_id);
                   1930:     if (bs->file)
                   1931:         return bdrv_snapshot_delete(bs->file, snapshot_id);
                   1932:     return -ENOTSUP;
1.1.1.5   root     1933: }
1.1       root     1934: 
1.1.1.6   root     1935: int bdrv_snapshot_list(BlockDriverState *bs,
1.1.1.5   root     1936:                        QEMUSnapshotInfo **psn_info)
                   1937: {
                   1938:     BlockDriver *drv = bs->drv;
                   1939:     if (!drv)
                   1940:         return -ENOMEDIUM;
1.1.1.18  root     1941:     if (drv->bdrv_snapshot_list)
                   1942:         return drv->bdrv_snapshot_list(bs, psn_info);
                   1943:     if (bs->file)
                   1944:         return bdrv_snapshot_list(bs->file, psn_info);
                   1945:     return -ENOTSUP;
1.1.1.5   root     1946: }
                   1947: 
1.1.1.19! root     1948: int bdrv_snapshot_load_tmp(BlockDriverState *bs,
        !          1949:         const char *snapshot_name)
        !          1950: {
        !          1951:     BlockDriver *drv = bs->drv;
        !          1952:     if (!drv) {
        !          1953:         return -ENOMEDIUM;
        !          1954:     }
        !          1955:     if (!bs->read_only) {
        !          1956:         return -EINVAL;
        !          1957:     }
        !          1958:     if (drv->bdrv_snapshot_load_tmp) {
        !          1959:         return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
        !          1960:     }
        !          1961:     return -ENOTSUP;
        !          1962: }
        !          1963: 
1.1.1.5   root     1964: #define NB_SUFFIXES 4
                   1965: 
                   1966: char *get_human_readable_size(char *buf, int buf_size, int64_t size)
                   1967: {
                   1968:     static const char suffixes[NB_SUFFIXES] = "KMGT";
                   1969:     int64_t base;
                   1970:     int i;
                   1971: 
                   1972:     if (size <= 999) {
                   1973:         snprintf(buf, buf_size, "%" PRId64, size);
                   1974:     } else {
                   1975:         base = 1024;
                   1976:         for(i = 0; i < NB_SUFFIXES; i++) {
                   1977:             if (size < (10 * base)) {
1.1.1.6   root     1978:                 snprintf(buf, buf_size, "%0.1f%c",
1.1.1.5   root     1979:                          (double)size / base,
                   1980:                          suffixes[i]);
                   1981:                 break;
                   1982:             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1.1.1.6   root     1983:                 snprintf(buf, buf_size, "%" PRId64 "%c",
1.1.1.5   root     1984:                          ((size + (base >> 1)) / base),
                   1985:                          suffixes[i]);
                   1986:                 break;
                   1987:             }
                   1988:             base = base * 1024;
                   1989:         }
1.1       root     1990:     }
1.1.1.5   root     1991:     return buf;
                   1992: }
                   1993: 
                   1994: char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
                   1995: {
                   1996:     char buf1[128], date_buf[128], clock_buf[128];
                   1997: #ifdef _WIN32
                   1998:     struct tm *ptm;
1.1.1.2   root     1999: #else
1.1.1.5   root     2000:     struct tm tm;
1.1.1.2   root     2001: #endif
1.1.1.5   root     2002:     time_t ti;
                   2003:     int64_t secs;
                   2004: 
                   2005:     if (!sn) {
1.1.1.6   root     2006:         snprintf(buf, buf_size,
                   2007:                  "%-10s%-20s%7s%20s%15s",
1.1.1.5   root     2008:                  "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
                   2009:     } else {
                   2010:         ti = sn->date_sec;
1.1       root     2011: #ifdef _WIN32
1.1.1.5   root     2012:         ptm = localtime(&ti);
                   2013:         strftime(date_buf, sizeof(date_buf),
                   2014:                  "%Y-%m-%d %H:%M:%S", ptm);
                   2015: #else
                   2016:         localtime_r(&ti, &tm);
                   2017:         strftime(date_buf, sizeof(date_buf),
                   2018:                  "%Y-%m-%d %H:%M:%S", &tm);
1.1       root     2019: #endif
1.1.1.5   root     2020:         secs = sn->vm_clock_nsec / 1000000000;
                   2021:         snprintf(clock_buf, sizeof(clock_buf),
                   2022:                  "%02d:%02d:%02d.%03d",
                   2023:                  (int)(secs / 3600),
                   2024:                  (int)((secs / 60) % 60),
1.1.1.6   root     2025:                  (int)(secs % 60),
1.1.1.5   root     2026:                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
                   2027:         snprintf(buf, buf_size,
1.1.1.6   root     2028:                  "%-10s%-20s%7s%20s%15s",
1.1.1.5   root     2029:                  sn->id_str, sn->name,
                   2030:                  get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
                   2031:                  date_buf,
                   2032:                  clock_buf);
                   2033:     }
                   2034:     return buf;
1.1       root     2035: }
                   2036: 
                   2037: 
1.1.1.5   root     2038: /**************************************************************/
                   2039: /* async I/Os */
                   2040: 
1.1.1.7   root     2041: BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1.1.1.13  root     2042:                                  QEMUIOVector *qiov, int nb_sectors,
1.1.1.7   root     2043:                                  BlockDriverCompletionFunc *cb, void *opaque)
                   2044: {
1.1.1.5   root     2045:     BlockDriver *drv = bs->drv;
1.1.1.6   root     2046:     BlockDriverAIOCB *ret;
1.1.1.5   root     2047: 
1.1.1.19! root     2048:     trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
        !          2049: 
1.1.1.5   root     2050:     if (!drv)
                   2051:         return NULL;
1.1.1.7   root     2052:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                   2053:         return NULL;
1.1.1.5   root     2054: 
1.1.1.13  root     2055:     ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
                   2056:                               cb, opaque);
1.1.1.6   root     2057: 
                   2058:     if (ret) {
                   2059:        /* Update stats even though technically transfer has not happened. */
1.1.1.14  root     2060:        bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.6   root     2061:        bs->rd_ops ++;
                   2062:     }
                   2063: 
                   2064:     return ret;
1.1       root     2065: }
                   2066: 
1.1.1.19! root     2067: typedef struct BlockCompleteData {
        !          2068:     BlockDriverCompletionFunc *cb;
        !          2069:     void *opaque;
        !          2070:     BlockDriverState *bs;
        !          2071:     int64_t sector_num;
        !          2072:     int nb_sectors;
        !          2073: } BlockCompleteData;
        !          2074: 
        !          2075: static void block_complete_cb(void *opaque, int ret)
        !          2076: {
        !          2077:     BlockCompleteData *b = opaque;
        !          2078: 
        !          2079:     if (b->bs->dirty_bitmap) {
        !          2080:         set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
        !          2081:     }
        !          2082:     b->cb(b->opaque, ret);
        !          2083:     qemu_free(b);
        !          2084: }
        !          2085: 
        !          2086: static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
        !          2087:                                              int64_t sector_num,
        !          2088:                                              int nb_sectors,
        !          2089:                                              BlockDriverCompletionFunc *cb,
        !          2090:                                              void *opaque)
        !          2091: {
        !          2092:     BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
        !          2093: 
        !          2094:     blkdata->bs = bs;
        !          2095:     blkdata->cb = cb;
        !          2096:     blkdata->opaque = opaque;
        !          2097:     blkdata->sector_num = sector_num;
        !          2098:     blkdata->nb_sectors = nb_sectors;
        !          2099: 
        !          2100:     return blkdata;
        !          2101: }
        !          2102: 
1.1.1.13  root     2103: BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
                   2104:                                   QEMUIOVector *qiov, int nb_sectors,
                   2105:                                   BlockDriverCompletionFunc *cb, void *opaque)
1.1       root     2106: {
1.1.1.5   root     2107:     BlockDriver *drv = bs->drv;
1.1.1.6   root     2108:     BlockDriverAIOCB *ret;
1.1.1.19! root     2109:     BlockCompleteData *blk_cb_data;
        !          2110: 
        !          2111:     trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
1.1       root     2112: 
1.1.1.5   root     2113:     if (!drv)
                   2114:         return NULL;
                   2115:     if (bs->read_only)
                   2116:         return NULL;
1.1.1.7   root     2117:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                   2118:         return NULL;
1.1.1.4   root     2119: 
1.1.1.14  root     2120:     if (bs->dirty_bitmap) {
1.1.1.19! root     2121:         blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
        !          2122:                                          opaque);
        !          2123:         cb = &block_complete_cb;
        !          2124:         opaque = blk_cb_data;
1.1.1.14  root     2125:     }
                   2126: 
1.1.1.13  root     2127:     ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
                   2128:                                cb, opaque);
1.1.1.6   root     2129: 
                   2130:     if (ret) {
1.1.1.18  root     2131:         /* Update stats even though technically transfer has not happened. */
                   2132:         bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
                   2133:         bs->wr_ops ++;
                   2134:         if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
                   2135:             bs->wr_highest_sector = sector_num + nb_sectors - 1;
                   2136:         }
1.1.1.6   root     2137:     }
                   2138: 
                   2139:     return ret;
1.1.1.5   root     2140: }
                   2141: 
1.1.1.14  root     2142: 
                   2143: typedef struct MultiwriteCB {
                   2144:     int error;
                   2145:     int num_requests;
                   2146:     int num_callbacks;
                   2147:     struct {
                   2148:         BlockDriverCompletionFunc *cb;
                   2149:         void *opaque;
                   2150:         QEMUIOVector *free_qiov;
                   2151:         void *free_buf;
                   2152:     } callbacks[];
                   2153: } MultiwriteCB;
                   2154: 
                   2155: static void multiwrite_user_cb(MultiwriteCB *mcb)
                   2156: {
                   2157:     int i;
                   2158: 
                   2159:     for (i = 0; i < mcb->num_callbacks; i++) {
                   2160:         mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1.1.1.16  root     2161:         if (mcb->callbacks[i].free_qiov) {
                   2162:             qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
                   2163:         }
1.1.1.14  root     2164:         qemu_free(mcb->callbacks[i].free_qiov);
1.1.1.15  root     2165:         qemu_vfree(mcb->callbacks[i].free_buf);
1.1.1.14  root     2166:     }
                   2167: }
                   2168: 
                   2169: static void multiwrite_cb(void *opaque, int ret)
                   2170: {
                   2171:     MultiwriteCB *mcb = opaque;
                   2172: 
1.1.1.19! root     2173:     trace_multiwrite_cb(mcb, ret);
        !          2174: 
1.1.1.16  root     2175:     if (ret < 0 && !mcb->error) {
1.1.1.14  root     2176:         mcb->error = ret;
                   2177:     }
                   2178: 
                   2179:     mcb->num_requests--;
                   2180:     if (mcb->num_requests == 0) {
1.1.1.17  root     2181:         multiwrite_user_cb(mcb);
1.1.1.14  root     2182:         qemu_free(mcb);
                   2183:     }
                   2184: }
                   2185: 
                   2186: static int multiwrite_req_compare(const void *a, const void *b)
                   2187: {
1.1.1.17  root     2188:     const BlockRequest *req1 = a, *req2 = b;
                   2189: 
                   2190:     /*
                   2191:      * Note that we can't simply subtract req2->sector from req1->sector
                   2192:      * here as that could overflow the return value.
                   2193:      */
                   2194:     if (req1->sector > req2->sector) {
                   2195:         return 1;
                   2196:     } else if (req1->sector < req2->sector) {
                   2197:         return -1;
                   2198:     } else {
                   2199:         return 0;
                   2200:     }
1.1.1.14  root     2201: }
                   2202: 
                   2203: /*
                   2204:  * Takes a bunch of requests and tries to merge them. Returns the number of
                   2205:  * requests that remain after merging.
                   2206:  */
                   2207: static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
                   2208:     int num_reqs, MultiwriteCB *mcb)
                   2209: {
                   2210:     int i, outidx;
                   2211: 
                   2212:     // Sort requests by start sector
                   2213:     qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
                   2214: 
                   2215:     // Check if adjacent requests touch the same clusters. If so, combine them,
                   2216:     // filling up gaps with zero sectors.
                   2217:     outidx = 0;
                   2218:     for (i = 1; i < num_reqs; i++) {
                   2219:         int merge = 0;
                   2220:         int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
                   2221: 
                   2222:         // This handles the cases that are valid for all block drivers, namely
                   2223:         // exactly sequential writes and overlapping writes.
                   2224:         if (reqs[i].sector <= oldreq_last) {
                   2225:             merge = 1;
                   2226:         }
                   2227: 
                   2228:         // The block driver may decide that it makes sense to combine requests
                   2229:         // even if there is a gap of some sectors between them. In this case,
                   2230:         // the gap is filled with zeros (therefore only applicable for yet
                   2231:         // unused space in format like qcow2).
                   2232:         if (!merge && bs->drv->bdrv_merge_requests) {
                   2233:             merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
                   2234:         }
                   2235: 
1.1.1.16  root     2236:         if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
                   2237:             merge = 0;
                   2238:         }
                   2239: 
1.1.1.14  root     2240:         if (merge) {
                   2241:             size_t size;
                   2242:             QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
                   2243:             qemu_iovec_init(qiov,
                   2244:                 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
                   2245: 
                   2246:             // Add the first request to the merged one. If the requests are
                   2247:             // overlapping, drop the last sectors of the first request.
                   2248:             size = (reqs[i].sector - reqs[outidx].sector) << 9;
                   2249:             qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
                   2250: 
                   2251:             // We might need to add some zeros between the two requests
                   2252:             if (reqs[i].sector > oldreq_last) {
                   2253:                 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
                   2254:                 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
                   2255:                 memset(buf, 0, zero_bytes);
                   2256:                 qemu_iovec_add(qiov, buf, zero_bytes);
                   2257:                 mcb->callbacks[i].free_buf = buf;
                   2258:             }
                   2259: 
                   2260:             // Add the second request
                   2261:             qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
                   2262: 
1.1.1.17  root     2263:             reqs[outidx].nb_sectors = qiov->size >> 9;
1.1.1.14  root     2264:             reqs[outidx].qiov = qiov;
                   2265: 
                   2266:             mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
                   2267:         } else {
                   2268:             outidx++;
                   2269:             reqs[outidx].sector     = reqs[i].sector;
                   2270:             reqs[outidx].nb_sectors = reqs[i].nb_sectors;
                   2271:             reqs[outidx].qiov       = reqs[i].qiov;
                   2272:         }
                   2273:     }
                   2274: 
                   2275:     return outidx + 1;
                   2276: }
                   2277: 
                   2278: /*
                   2279:  * Submit multiple AIO write requests at once.
                   2280:  *
                   2281:  * On success, the function returns 0 and all requests in the reqs array have
                   2282:  * been submitted. In error case this function returns -1, and any of the
                   2283:  * requests may or may not be submitted yet. In particular, this means that the
                   2284:  * callback will be called for some of the requests, for others it won't. The
                   2285:  * caller must check the error field of the BlockRequest to wait for the right
                   2286:  * callbacks (if error != 0, no callback will be called).
                   2287:  *
                   2288:  * The implementation may modify the contents of the reqs array, e.g. to merge
                   2289:  * requests. However, the fields opaque and error are left unmodified as they
                   2290:  * are used to signal failure for a single request to the caller.
                   2291:  */
                   2292: int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
                   2293: {
                   2294:     BlockDriverAIOCB *acb;
                   2295:     MultiwriteCB *mcb;
                   2296:     int i;
                   2297: 
                   2298:     if (num_reqs == 0) {
                   2299:         return 0;
                   2300:     }
                   2301: 
                   2302:     // Create MultiwriteCB structure
                   2303:     mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
                   2304:     mcb->num_requests = 0;
                   2305:     mcb->num_callbacks = num_reqs;
                   2306: 
                   2307:     for (i = 0; i < num_reqs; i++) {
                   2308:         mcb->callbacks[i].cb = reqs[i].cb;
                   2309:         mcb->callbacks[i].opaque = reqs[i].opaque;
                   2310:     }
                   2311: 
                   2312:     // Check for mergable requests
                   2313:     num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
                   2314: 
1.1.1.19! root     2315:     trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
        !          2316: 
1.1.1.17  root     2317:     /*
                   2318:      * Run the aio requests. As soon as one request can't be submitted
                   2319:      * successfully, fail all requests that are not yet submitted (we must
                   2320:      * return failure for all requests anyway)
                   2321:      *
                   2322:      * num_requests cannot be set to the right value immediately: If
                   2323:      * bdrv_aio_writev fails for some request, num_requests would be too high
                   2324:      * and therefore multiwrite_cb() would never recognize the multiwrite
                   2325:      * request as completed. We also cannot use the loop variable i to set it
                   2326:      * when the first request fails because the callback may already have been
                   2327:      * called for previously submitted requests. Thus, num_requests must be
                   2328:      * incremented for each request that is submitted.
                   2329:      *
                   2330:      * The problem that callbacks may be called early also means that we need
                   2331:      * to take care that num_requests doesn't become 0 before all requests are
                   2332:      * submitted - multiwrite_cb() would consider the multiwrite request
                   2333:      * completed. A dummy request that is "completed" by a manual call to
                   2334:      * multiwrite_cb() takes care of this.
                   2335:      */
                   2336:     mcb->num_requests = 1;
                   2337: 
1.1.1.19! root     2338:     // Run the aio requests
1.1.1.14  root     2339:     for (i = 0; i < num_reqs; i++) {
1.1.1.17  root     2340:         mcb->num_requests++;
1.1.1.14  root     2341:         acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
                   2342:             reqs[i].nb_sectors, multiwrite_cb, mcb);
                   2343: 
                   2344:         if (acb == NULL) {
                   2345:             // We can only fail the whole thing if no request has been
                   2346:             // submitted yet. Otherwise we'll wait for the submitted AIOs to
                   2347:             // complete and report the error in the callback.
1.1.1.17  root     2348:             if (i == 0) {
1.1.1.19! root     2349:                 trace_bdrv_aio_multiwrite_earlyfail(mcb);
1.1.1.14  root     2350:                 goto fail;
                   2351:             } else {
1.1.1.19! root     2352:                 trace_bdrv_aio_multiwrite_latefail(mcb, i);
1.1.1.16  root     2353:                 multiwrite_cb(mcb, -EIO);
1.1.1.14  root     2354:                 break;
                   2355:             }
                   2356:         }
                   2357:     }
                   2358: 
1.1.1.17  root     2359:     /* Complete the dummy request */
                   2360:     multiwrite_cb(mcb, 0);
                   2361: 
1.1.1.14  root     2362:     return 0;
                   2363: 
                   2364: fail:
1.1.1.17  root     2365:     for (i = 0; i < mcb->num_callbacks; i++) {
                   2366:         reqs[i].error = -EIO;
                   2367:     }
                   2368:     qemu_free(mcb);
1.1.1.14  root     2369:     return -1;
                   2370: }
                   2371: 
                   2372: BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
                   2373:         BlockDriverCompletionFunc *cb, void *opaque)
                   2374: {
                   2375:     BlockDriver *drv = bs->drv;
                   2376: 
1.1.1.18  root     2377:     if (bs->open_flags & BDRV_O_NO_FLUSH) {
                   2378:         return bdrv_aio_noop_em(bs, cb, opaque);
                   2379:     }
                   2380: 
1.1.1.14  root     2381:     if (!drv)
                   2382:         return NULL;
                   2383:     return drv->bdrv_aio_flush(bs, cb, opaque);
                   2384: }
                   2385: 
1.1.1.5   root     2386: void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1.1.1.4   root     2387: {
1.1.1.10  root     2388:     acb->pool->cancel(acb);
1.1.1.5   root     2389: }
1.1.1.4   root     2390: 
                   2391: 
1.1.1.5   root     2392: /**************************************************************/
                   2393: /* async block device emulation */
1.1.1.4   root     2394: 
1.1.1.13  root     2395: typedef struct BlockDriverAIOCBSync {
                   2396:     BlockDriverAIOCB common;
                   2397:     QEMUBH *bh;
                   2398:     int ret;
                   2399:     /* vector translation state */
                   2400:     QEMUIOVector *qiov;
                   2401:     uint8_t *bounce;
                   2402:     int is_write;
                   2403: } BlockDriverAIOCBSync;
                   2404: 
                   2405: static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
                   2406: {
1.1.1.18  root     2407:     BlockDriverAIOCBSync *acb =
                   2408:         container_of(blockacb, BlockDriverAIOCBSync, common);
1.1.1.13  root     2409:     qemu_bh_delete(acb->bh);
                   2410:     acb->bh = NULL;
                   2411:     qemu_aio_release(acb);
                   2412: }
                   2413: 
                   2414: static AIOPool bdrv_em_aio_pool = {
                   2415:     .aiocb_size         = sizeof(BlockDriverAIOCBSync),
                   2416:     .cancel             = bdrv_aio_cancel_em,
                   2417: };
                   2418: 
1.1.1.5   root     2419: static void bdrv_aio_bh_cb(void *opaque)
1.1.1.4   root     2420: {
1.1.1.5   root     2421:     BlockDriverAIOCBSync *acb = opaque;
1.1.1.13  root     2422: 
                   2423:     if (!acb->is_write)
                   2424:         qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
                   2425:     qemu_vfree(acb->bounce);
1.1.1.5   root     2426:     acb->common.cb(acb->common.opaque, acb->ret);
1.1.1.13  root     2427:     qemu_bh_delete(acb->bh);
                   2428:     acb->bh = NULL;
1.1.1.5   root     2429:     qemu_aio_release(acb);
1.1.1.4   root     2430: }
                   2431: 
1.1.1.13  root     2432: static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
                   2433:                                             int64_t sector_num,
                   2434:                                             QEMUIOVector *qiov,
                   2435:                                             int nb_sectors,
                   2436:                                             BlockDriverCompletionFunc *cb,
                   2437:                                             void *opaque,
                   2438:                                             int is_write)
                   2439: 
1.1       root     2440: {
1.1.1.5   root     2441:     BlockDriverAIOCBSync *acb;
1.1       root     2442: 
1.1.1.13  root     2443:     acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
                   2444:     acb->is_write = is_write;
                   2445:     acb->qiov = qiov;
                   2446:     acb->bounce = qemu_blockalign(bs, qiov->size);
                   2447: 
1.1.1.5   root     2448:     if (!acb->bh)
                   2449:         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1.1.1.13  root     2450: 
                   2451:     if (is_write) {
                   2452:         qemu_iovec_to_buffer(acb->qiov, acb->bounce);
                   2453:         acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
                   2454:     } else {
                   2455:         acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
                   2456:     }
                   2457: 
1.1.1.5   root     2458:     qemu_bh_schedule(acb->bh);
1.1.1.13  root     2459: 
1.1.1.5   root     2460:     return &acb->common;
                   2461: }
1.1       root     2462: 
1.1.1.13  root     2463: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
                   2464:         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5   root     2465:         BlockDriverCompletionFunc *cb, void *opaque)
                   2466: {
1.1.1.13  root     2467:     return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1.1.1.5   root     2468: }
                   2469: 
1.1.1.13  root     2470: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
                   2471:         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
                   2472:         BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5   root     2473: {
1.1.1.13  root     2474:     return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1.1       root     2475: }
                   2476: 
1.1.1.14  root     2477: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
                   2478:         BlockDriverCompletionFunc *cb, void *opaque)
                   2479: {
                   2480:     BlockDriverAIOCBSync *acb;
                   2481: 
                   2482:     acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
                   2483:     acb->is_write = 1; /* don't bounce in the completion hadler */
                   2484:     acb->qiov = NULL;
                   2485:     acb->bounce = NULL;
                   2486:     acb->ret = 0;
                   2487: 
                   2488:     if (!acb->bh)
                   2489:         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
                   2490: 
                   2491:     bdrv_flush(bs);
                   2492:     qemu_bh_schedule(acb->bh);
                   2493:     return &acb->common;
                   2494: }
                   2495: 
1.1.1.18  root     2496: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
                   2497:         BlockDriverCompletionFunc *cb, void *opaque)
                   2498: {
                   2499:     BlockDriverAIOCBSync *acb;
                   2500: 
                   2501:     acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
                   2502:     acb->is_write = 1; /* don't bounce in the completion handler */
                   2503:     acb->qiov = NULL;
                   2504:     acb->bounce = NULL;
                   2505:     acb->ret = 0;
                   2506: 
                   2507:     if (!acb->bh) {
                   2508:         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
                   2509:     }
                   2510: 
                   2511:     qemu_bh_schedule(acb->bh);
                   2512:     return &acb->common;
                   2513: }
                   2514: 
1.1.1.5   root     2515: /**************************************************************/
                   2516: /* sync block device emulation */
                   2517: 
                   2518: static void bdrv_rw_em_cb(void *opaque, int ret)
1.1.1.4   root     2519: {
1.1.1.5   root     2520:     *(int *)opaque = ret;
1.1.1.4   root     2521: }
                   2522: 
1.1.1.5   root     2523: #define NOT_DONE 0x7fffffff
                   2524: 
1.1.1.6   root     2525: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5   root     2526:                         uint8_t *buf, int nb_sectors)
                   2527: {
                   2528:     int async_ret;
                   2529:     BlockDriverAIOCB *acb;
1.1.1.13  root     2530:     struct iovec iov;
                   2531:     QEMUIOVector qiov;
1.1.1.5   root     2532: 
1.1.1.14  root     2533:     async_context_push();
                   2534: 
1.1.1.5   root     2535:     async_ret = NOT_DONE;
1.1.1.13  root     2536:     iov.iov_base = (void *)buf;
1.1.1.18  root     2537:     iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13  root     2538:     qemu_iovec_init_external(&qiov, &iov, 1);
                   2539:     acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
                   2540:         bdrv_rw_em_cb, &async_ret);
1.1.1.14  root     2541:     if (acb == NULL) {
                   2542:         async_ret = -1;
                   2543:         goto fail;
                   2544:     }
1.1.1.7   root     2545: 
1.1.1.5   root     2546:     while (async_ret == NOT_DONE) {
                   2547:         qemu_aio_wait();
                   2548:     }
1.1.1.7   root     2549: 
1.1.1.14  root     2550: 
                   2551: fail:
                   2552:     async_context_pop();
1.1.1.5   root     2553:     return async_ret;
                   2554: }
                   2555: 
                   2556: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                   2557:                          const uint8_t *buf, int nb_sectors)
                   2558: {
                   2559:     int async_ret;
                   2560:     BlockDriverAIOCB *acb;
1.1.1.13  root     2561:     struct iovec iov;
                   2562:     QEMUIOVector qiov;
1.1.1.5   root     2563: 
1.1.1.14  root     2564:     async_context_push();
                   2565: 
1.1.1.5   root     2566:     async_ret = NOT_DONE;
1.1.1.13  root     2567:     iov.iov_base = (void *)buf;
1.1.1.18  root     2568:     iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13  root     2569:     qemu_iovec_init_external(&qiov, &iov, 1);
                   2570:     acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
                   2571:         bdrv_rw_em_cb, &async_ret);
1.1.1.14  root     2572:     if (acb == NULL) {
                   2573:         async_ret = -1;
                   2574:         goto fail;
                   2575:     }
1.1.1.5   root     2576:     while (async_ret == NOT_DONE) {
                   2577:         qemu_aio_wait();
                   2578:     }
1.1.1.14  root     2579: 
                   2580: fail:
                   2581:     async_context_pop();
1.1.1.5   root     2582:     return async_ret;
                   2583: }
1.1       root     2584: 
                   2585: void bdrv_init(void)
                   2586: {
1.1.1.13  root     2587:     module_call_init(MODULE_INIT_BLOCK);
1.1.1.10  root     2588: }
                   2589: 
1.1.1.14  root     2590: void bdrv_init_with_whitelist(void)
                   2591: {
                   2592:     use_bdrv_whitelist = 1;
                   2593:     bdrv_init();
                   2594: }
                   2595: 
1.1.1.13  root     2596: void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                   2597:                    BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5   root     2598: {
                   2599:     BlockDriverAIOCB *acb;
                   2600: 
1.1.1.10  root     2601:     if (pool->free_aiocb) {
                   2602:         acb = pool->free_aiocb;
                   2603:         pool->free_aiocb = acb->next;
1.1.1.5   root     2604:     } else {
1.1.1.10  root     2605:         acb = qemu_mallocz(pool->aiocb_size);
                   2606:         acb->pool = pool;
1.1.1.5   root     2607:     }
                   2608:     acb->bs = bs;
                   2609:     acb->cb = cb;
                   2610:     acb->opaque = opaque;
                   2611:     return acb;
                   2612: }
                   2613: 
                   2614: void qemu_aio_release(void *p)
                   2615: {
1.1.1.10  root     2616:     BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
                   2617:     AIOPool *pool = acb->pool;
                   2618:     acb->next = pool->free_aiocb;
                   2619:     pool->free_aiocb = acb;
1.1.1.5   root     2620: }
                   2621: 
                   2622: /**************************************************************/
                   2623: /* removable device support */
                   2624: 
                   2625: /**
                   2626:  * Return TRUE if the media is present
                   2627:  */
                   2628: int bdrv_is_inserted(BlockDriverState *bs)
                   2629: {
                   2630:     BlockDriver *drv = bs->drv;
                   2631:     int ret;
                   2632:     if (!drv)
                   2633:         return 0;
                   2634:     if (!drv->bdrv_is_inserted)
1.1.1.18  root     2635:         return !bs->tray_open;
1.1.1.5   root     2636:     ret = drv->bdrv_is_inserted(bs);
                   2637:     return ret;
                   2638: }
                   2639: 
                   2640: /**
                   2641:  * Return TRUE if the media changed since the last call to this
1.1.1.6   root     2642:  * function. It is currently only used for floppy disks
1.1.1.5   root     2643:  */
                   2644: int bdrv_media_changed(BlockDriverState *bs)
                   2645: {
                   2646:     BlockDriver *drv = bs->drv;
                   2647:     int ret;
                   2648: 
                   2649:     if (!drv || !drv->bdrv_media_changed)
                   2650:         ret = -ENOTSUP;
                   2651:     else
                   2652:         ret = drv->bdrv_media_changed(bs);
                   2653:     if (ret == -ENOTSUP)
                   2654:         ret = bs->media_changed;
                   2655:     bs->media_changed = 0;
                   2656:     return ret;
                   2657: }
                   2658: 
                   2659: /**
                   2660:  * If eject_flag is TRUE, eject the media. Otherwise, close the tray
                   2661:  */
1.1.1.13  root     2662: int bdrv_eject(BlockDriverState *bs, int eject_flag)
1.1.1.5   root     2663: {
                   2664:     BlockDriver *drv = bs->drv;
                   2665:     int ret;
                   2666: 
1.1.1.13  root     2667:     if (bs->locked) {
                   2668:         return -EBUSY;
                   2669:     }
                   2670: 
1.1.1.5   root     2671:     if (!drv || !drv->bdrv_eject) {
                   2672:         ret = -ENOTSUP;
                   2673:     } else {
                   2674:         ret = drv->bdrv_eject(bs, eject_flag);
                   2675:     }
                   2676:     if (ret == -ENOTSUP) {
1.1.1.13  root     2677:         ret = 0;
1.1.1.5   root     2678:     }
1.1.1.18  root     2679:     if (ret >= 0) {
                   2680:         bs->tray_open = eject_flag;
                   2681:     }
1.1.1.13  root     2682: 
                   2683:     return ret;
1.1.1.5   root     2684: }
                   2685: 
                   2686: int bdrv_is_locked(BlockDriverState *bs)
                   2687: {
                   2688:     return bs->locked;
                   2689: }
                   2690: 
                   2691: /**
                   2692:  * Lock or unlock the media (if it is locked, the user won't be able
                   2693:  * to eject it manually).
                   2694:  */
                   2695: void bdrv_set_locked(BlockDriverState *bs, int locked)
                   2696: {
                   2697:     BlockDriver *drv = bs->drv;
                   2698: 
                   2699:     bs->locked = locked;
                   2700:     if (drv && drv->bdrv_set_locked) {
                   2701:         drv->bdrv_set_locked(bs, locked);
                   2702:     }
1.1       root     2703: }
1.1.1.6   root     2704: 
                   2705: /* needed for generic scsi interface */
                   2706: 
                   2707: int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
                   2708: {
                   2709:     BlockDriver *drv = bs->drv;
                   2710: 
                   2711:     if (drv && drv->bdrv_ioctl)
                   2712:         return drv->bdrv_ioctl(bs, req, buf);
                   2713:     return -ENOTSUP;
                   2714: }
1.1.1.13  root     2715: 
                   2716: BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
                   2717:         unsigned long int req, void *buf,
                   2718:         BlockDriverCompletionFunc *cb, void *opaque)
                   2719: {
                   2720:     BlockDriver *drv = bs->drv;
                   2721: 
                   2722:     if (drv && drv->bdrv_aio_ioctl)
                   2723:         return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
                   2724:     return NULL;
                   2725: }
                   2726: 
1.1.1.14  root     2727: 
                   2728: 
1.1.1.13  root     2729: void *qemu_blockalign(BlockDriverState *bs, size_t size)
                   2730: {
                   2731:     return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
                   2732: }
1.1.1.14  root     2733: 
                   2734: void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
                   2735: {
                   2736:     int64_t bitmap_size;
                   2737: 
1.1.1.18  root     2738:     bs->dirty_count = 0;
1.1.1.14  root     2739:     if (enable) {
                   2740:         if (!bs->dirty_bitmap) {
                   2741:             bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
                   2742:                     BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
                   2743:             bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
                   2744: 
                   2745:             bs->dirty_bitmap = qemu_mallocz(bitmap_size);
                   2746:         }
                   2747:     } else {
                   2748:         if (bs->dirty_bitmap) {
                   2749:             qemu_free(bs->dirty_bitmap);
                   2750:             bs->dirty_bitmap = NULL;
                   2751:         }
                   2752:     }
                   2753: }
                   2754: 
                   2755: int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
                   2756: {
                   2757:     int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
                   2758: 
                   2759:     if (bs->dirty_bitmap &&
                   2760:         (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
1.1.1.19! root     2761:         return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
        !          2762:             (1UL << (chunk % (sizeof(unsigned long) * 8))));
1.1.1.14  root     2763:     } else {
                   2764:         return 0;
                   2765:     }
                   2766: }
                   2767: 
                   2768: void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
                   2769:                       int nr_sectors)
                   2770: {
                   2771:     set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
                   2772: }
1.1.1.18  root     2773: 
                   2774: int64_t bdrv_get_dirty_count(BlockDriverState *bs)
                   2775: {
                   2776:     return bs->dirty_count;
                   2777: }
1.1.1.19! root     2778: 
        !          2779: void bdrv_set_in_use(BlockDriverState *bs, int in_use)
        !          2780: {
        !          2781:     assert(bs->in_use != in_use);
        !          2782:     bs->in_use = in_use;
        !          2783: }
        !          2784: 
        !          2785: int bdrv_in_use(BlockDriverState *bs)
        !          2786: {
        !          2787:     return bs->in_use;
        !          2788: }
        !          2789: 
        !          2790: int bdrv_img_create(const char *filename, const char *fmt,
        !          2791:                     const char *base_filename, const char *base_fmt,
        !          2792:                     char *options, uint64_t img_size, int flags)
        !          2793: {
        !          2794:     QEMUOptionParameter *param = NULL, *create_options = NULL;
        !          2795:     QEMUOptionParameter *backing_fmt, *backing_file;
        !          2796:     BlockDriverState *bs = NULL;
        !          2797:     BlockDriver *drv, *proto_drv;
        !          2798:     BlockDriver *backing_drv = NULL;
        !          2799:     int ret = 0;
        !          2800: 
        !          2801:     /* Find driver and parse its options */
        !          2802:     drv = bdrv_find_format(fmt);
        !          2803:     if (!drv) {
        !          2804:         error_report("Unknown file format '%s'", fmt);
        !          2805:         ret = -EINVAL;
        !          2806:         goto out;
        !          2807:     }
        !          2808: 
        !          2809:     proto_drv = bdrv_find_protocol(filename);
        !          2810:     if (!proto_drv) {
        !          2811:         error_report("Unknown protocol '%s'", filename);
        !          2812:         ret = -EINVAL;
        !          2813:         goto out;
        !          2814:     }
        !          2815: 
        !          2816:     create_options = append_option_parameters(create_options,
        !          2817:                                               drv->create_options);
        !          2818:     create_options = append_option_parameters(create_options,
        !          2819:                                               proto_drv->create_options);
        !          2820: 
        !          2821:     /* Create parameter list with default values */
        !          2822:     param = parse_option_parameters("", create_options, param);
        !          2823: 
        !          2824:     set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
        !          2825: 
        !          2826:     /* Parse -o options */
        !          2827:     if (options) {
        !          2828:         param = parse_option_parameters(options, create_options, param);
        !          2829:         if (param == NULL) {
        !          2830:             error_report("Invalid options for file format '%s'.", fmt);
        !          2831:             ret = -EINVAL;
        !          2832:             goto out;
        !          2833:         }
        !          2834:     }
        !          2835: 
        !          2836:     if (base_filename) {
        !          2837:         if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
        !          2838:                                  base_filename)) {
        !          2839:             error_report("Backing file not supported for file format '%s'",
        !          2840:                          fmt);
        !          2841:             ret = -EINVAL;
        !          2842:             goto out;
        !          2843:         }
        !          2844:     }
        !          2845: 
        !          2846:     if (base_fmt) {
        !          2847:         if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
        !          2848:             error_report("Backing file format not supported for file "
        !          2849:                          "format '%s'", fmt);
        !          2850:             ret = -EINVAL;
        !          2851:             goto out;
        !          2852:         }
        !          2853:     }
        !          2854: 
        !          2855:     backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
        !          2856:     if (backing_file && backing_file->value.s) {
        !          2857:         if (!strcmp(filename, backing_file->value.s)) {
        !          2858:             error_report("Error: Trying to create an image with the "
        !          2859:                          "same filename as the backing file");
        !          2860:             ret = -EINVAL;
        !          2861:             goto out;
        !          2862:         }
        !          2863:     }
        !          2864: 
        !          2865:     backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
        !          2866:     if (backing_fmt && backing_fmt->value.s) {
        !          2867:         backing_drv = bdrv_find_format(backing_fmt->value.s);
        !          2868:         if (!backing_drv) {
        !          2869:             error_report("Unknown backing file format '%s'",
        !          2870:                          backing_fmt->value.s);
        !          2871:             ret = -EINVAL;
        !          2872:             goto out;
        !          2873:         }
        !          2874:     }
        !          2875: 
        !          2876:     // The size for the image must always be specified, with one exception:
        !          2877:     // If we are using a backing file, we can obtain the size from there
        !          2878:     if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
        !          2879:         if (backing_file && backing_file->value.s) {
        !          2880:             uint64_t size;
        !          2881:             char buf[32];
        !          2882: 
        !          2883:             bs = bdrv_new("");
        !          2884: 
        !          2885:             ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv);
        !          2886:             if (ret < 0) {
        !          2887:                 error_report("Could not open '%s'", backing_file->value.s);
        !          2888:                 goto out;
        !          2889:             }
        !          2890:             bdrv_get_geometry(bs, &size);
        !          2891:             size *= 512;
        !          2892: 
        !          2893:             snprintf(buf, sizeof(buf), "%" PRId64, size);
        !          2894:             set_option_parameter(param, BLOCK_OPT_SIZE, buf);
        !          2895:         } else {
        !          2896:             error_report("Image creation needs a size parameter");
        !          2897:             ret = -EINVAL;
        !          2898:             goto out;
        !          2899:         }
        !          2900:     }
        !          2901: 
        !          2902:     printf("Formatting '%s', fmt=%s ", filename, fmt);
        !          2903:     print_option_parameters(param);
        !          2904:     puts("");
        !          2905: 
        !          2906:     ret = bdrv_create(drv, filename, param);
        !          2907: 
        !          2908:     if (ret < 0) {
        !          2909:         if (ret == -ENOTSUP) {
        !          2910:             error_report("Formatting or formatting option not supported for "
        !          2911:                          "file format '%s'", fmt);
        !          2912:         } else if (ret == -EFBIG) {
        !          2913:             error_report("The image size is too large for file format '%s'",
        !          2914:                          fmt);
        !          2915:         } else {
        !          2916:             error_report("%s: error while creating %s: %s", filename, fmt,
        !          2917:                          strerror(-ret));
        !          2918:         }
        !          2919:     }
        !          2920: 
        !          2921: out:
        !          2922:     free_option_parameters(create_options);
        !          2923:     free_option_parameters(param);
        !          2924: 
        !          2925:     if (bs) {
        !          2926:         bdrv_delete(bs);
        !          2927:     }
        !          2928: 
        !          2929:     return ret;
        !          2930: }

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