Annotation of qemu/block.c, revision 1.1.1.20

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: 
1.1.1.20! root      700: /* make a BlockDriverState anonymous by removing from bdrv_state list.
        !           701:    Also, NULL terminate the device_name to prevent double remove */
        !           702: void bdrv_make_anon(BlockDriverState *bs)
        !           703: {
        !           704:     if (bs->device_name[0] != '\0') {
        !           705:         QTAILQ_REMOVE(&bdrv_states, bs, list);
        !           706:     }
        !           707:     bs->device_name[0] = '\0';
        !           708: }
        !           709: 
1.1       root      710: void bdrv_delete(BlockDriverState *bs)
                    711: {
1.1.1.18  root      712:     assert(!bs->peer);
1.1.1.7   root      713: 
1.1.1.18  root      714:     /* remove from list, if necessary */
1.1.1.20! root      715:     bdrv_make_anon(bs);
1.1.1.7   root      716: 
1.1       root      717:     bdrv_close(bs);
1.1.1.18  root      718:     if (bs->file != NULL) {
                    719:         bdrv_delete(bs->file);
                    720:     }
                    721: 
                    722:     assert(bs != bs_snapshots);
1.1       root      723:     qemu_free(bs);
                    724: }
                    725: 
1.1.1.18  root      726: int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
                    727: {
                    728:     if (bs->peer) {
                    729:         return -EBUSY;
                    730:     }
                    731:     bs->peer = qdev;
                    732:     return 0;
                    733: }
                    734: 
                    735: void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
                    736: {
                    737:     assert(bs->peer == qdev);
                    738:     bs->peer = NULL;
                    739: }
                    740: 
                    741: DeviceState *bdrv_get_attached(BlockDriverState *bs)
                    742: {
                    743:     return bs->peer;
                    744: }
                    745: 
1.1.1.13  root      746: /*
                    747:  * Run consistency checks on an image
                    748:  *
1.1.1.18  root      749:  * Returns 0 if the check could be completed (it doesn't mean that the image is
                    750:  * free of errors) or -errno when an internal error occured. The results of the
                    751:  * check are stored in res.
1.1.1.13  root      752:  */
1.1.1.18  root      753: int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
1.1.1.13  root      754: {
                    755:     if (bs->drv->bdrv_check == NULL) {
                    756:         return -ENOTSUP;
                    757:     }
                    758: 
1.1.1.18  root      759:     memset(res, 0, sizeof(*res));
                    760:     return bs->drv->bdrv_check(bs, res);
1.1.1.13  root      761: }
                    762: 
1.1.1.19  root      763: #define COMMIT_BUF_SECTORS 2048
                    764: 
1.1       root      765: /* commit COW file into the raw image */
                    766: int bdrv_commit(BlockDriverState *bs)
                    767: {
1.1.1.5   root      768:     BlockDriver *drv = bs->drv;
1.1.1.18  root      769:     BlockDriver *backing_drv;
1.1.1.19  root      770:     int64_t sector, total_sectors;
                    771:     int n, ro, open_flags;
1.1.1.18  root      772:     int ret = 0, rw_ret = 0;
1.1.1.19  root      773:     uint8_t *buf;
1.1.1.18  root      774:     char filename[1024];
                    775:     BlockDriverState *bs_rw, *bs_ro;
1.1       root      776: 
1.1.1.5   root      777:     if (!drv)
                    778:         return -ENOMEDIUM;
1.1.1.18  root      779:     
                    780:     if (!bs->backing_hd) {
                    781:         return -ENOTSUP;
                    782:     }
1.1       root      783: 
1.1.1.18  root      784:     if (bs->backing_hd->keep_read_only) {
                    785:         return -EACCES;
1.1       root      786:     }
                    787: 
1.1.1.18  root      788:     backing_drv = bs->backing_hd->drv;
                    789:     ro = bs->backing_hd->read_only;
                    790:     strncpy(filename, bs->backing_hd->filename, sizeof(filename));
                    791:     open_flags =  bs->backing_hd->open_flags;
                    792: 
                    793:     if (ro) {
                    794:         /* re-open as RW */
                    795:         bdrv_delete(bs->backing_hd);
                    796:         bs->backing_hd = NULL;
                    797:         bs_rw = bdrv_new("");
                    798:         rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
                    799:             backing_drv);
                    800:         if (rw_ret < 0) {
                    801:             bdrv_delete(bs_rw);
                    802:             /* try to re-open read-only */
                    803:             bs_ro = bdrv_new("");
                    804:             ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
                    805:                 backing_drv);
                    806:             if (ret < 0) {
                    807:                 bdrv_delete(bs_ro);
                    808:                 /* drive not functional anymore */
                    809:                 bs->drv = NULL;
                    810:                 return ret;
                    811:             }
                    812:             bs->backing_hd = bs_ro;
                    813:             return rw_ret;
                    814:         }
                    815:         bs->backing_hd = bs_rw;
1.1       root      816:     }
                    817: 
1.1.1.14  root      818:     total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
1.1.1.19  root      819:     buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
1.1       root      820: 
1.1.1.19  root      821:     for (sector = 0; sector < total_sectors; sector += n) {
                    822:         if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
                    823: 
                    824:             if (bdrv_read(bs, sector, buf, n) != 0) {
                    825:                 ret = -EIO;
                    826:                 goto ro_cleanup;
                    827:             }
                    828: 
                    829:             if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
                    830:                 ret = -EIO;
                    831:                 goto ro_cleanup;
                    832:             }
1.1       root      833:         }
                    834:     }
1.1.1.2   root      835: 
1.1.1.18  root      836:     if (drv->bdrv_make_empty) {
                    837:         ret = drv->bdrv_make_empty(bs);
                    838:         bdrv_flush(bs);
                    839:     }
1.1.1.2   root      840: 
1.1.1.18  root      841:     /*
                    842:      * Make sure all data we wrote to the backing device is actually
                    843:      * stable on disk.
                    844:      */
                    845:     if (bs->backing_hd)
                    846:         bdrv_flush(bs->backing_hd);
                    847: 
                    848: ro_cleanup:
1.1.1.19  root      849:     qemu_free(buf);
1.1.1.18  root      850: 
                    851:     if (ro) {
                    852:         /* re-open as RO */
                    853:         bdrv_delete(bs->backing_hd);
                    854:         bs->backing_hd = NULL;
                    855:         bs_ro = bdrv_new("");
                    856:         ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
                    857:             backing_drv);
                    858:         if (ret < 0) {
                    859:             bdrv_delete(bs_ro);
                    860:             /* drive not functional anymore */
                    861:             bs->drv = NULL;
                    862:             return ret;
                    863:         }
                    864:         bs->backing_hd = bs_ro;
                    865:         bs->backing_hd->keep_read_only = 0;
                    866:     }
                    867: 
                    868:     return ret;
                    869: }
                    870: 
                    871: void bdrv_commit_all(void)
                    872: {
                    873:     BlockDriverState *bs;
                    874: 
                    875:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                    876:         bdrv_commit(bs);
                    877:     }
                    878: }
                    879: 
                    880: /*
                    881:  * Return values:
                    882:  * 0        - success
                    883:  * -EINVAL  - backing format specified, but no file
                    884:  * -ENOSPC  - can't update the backing file because no space is left in the
                    885:  *            image file header
                    886:  * -ENOTSUP - format driver doesn't support changing the backing file
                    887:  */
                    888: int bdrv_change_backing_file(BlockDriverState *bs,
                    889:     const char *backing_file, const char *backing_fmt)
                    890: {
                    891:     BlockDriver *drv = bs->drv;
                    892: 
                    893:     if (drv->bdrv_change_backing_file != NULL) {
                    894:         return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
                    895:     } else {
                    896:         return -ENOTSUP;
                    897:     }
1.1       root      898: }
                    899: 
1.1.1.7   root      900: static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
                    901:                                    size_t size)
                    902: {
                    903:     int64_t len;
                    904: 
                    905:     if (!bdrv_is_inserted(bs))
                    906:         return -ENOMEDIUM;
                    907: 
                    908:     if (bs->growable)
                    909:         return 0;
                    910: 
                    911:     len = bdrv_getlength(bs);
                    912: 
1.1.1.11  root      913:     if (offset < 0)
                    914:         return -EIO;
                    915: 
                    916:     if ((offset > len) || (len - offset < size))
1.1.1.7   root      917:         return -EIO;
                    918: 
                    919:     return 0;
                    920: }
                    921: 
                    922: static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
                    923:                               int nb_sectors)
                    924: {
1.1.1.18  root      925:     return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
                    926:                                    nb_sectors * BDRV_SECTOR_SIZE);
1.1.1.7   root      927: }
                    928: 
1.1.1.5   root      929: /* return < 0 if error. See bdrv_write() for the return codes */
1.1.1.6   root      930: int bdrv_read(BlockDriverState *bs, int64_t sector_num,
1.1       root      931:               uint8_t *buf, int nb_sectors)
                    932: {
                    933:     BlockDriver *drv = bs->drv;
                    934: 
1.1.1.5   root      935:     if (!drv)
                    936:         return -ENOMEDIUM;
1.1.1.7   root      937:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                    938:         return -EIO;
1.1       root      939: 
1.1.1.13  root      940:     return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
1.1       root      941: }
                    942: 
1.1.1.14  root      943: static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
                    944:                              int nb_sectors, int dirty)
                    945: {
                    946:     int64_t start, end;
                    947:     unsigned long val, idx, bit;
                    948: 
                    949:     start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
                    950:     end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
                    951: 
                    952:     for (; start <= end; start++) {
                    953:         idx = start / (sizeof(unsigned long) * 8);
                    954:         bit = start % (sizeof(unsigned long) * 8);
                    955:         val = bs->dirty_bitmap[idx];
                    956:         if (dirty) {
1.1.1.19  root      957:             if (!(val & (1UL << bit))) {
1.1.1.18  root      958:                 bs->dirty_count++;
1.1.1.19  root      959:                 val |= 1UL << bit;
1.1.1.18  root      960:             }
1.1.1.14  root      961:         } else {
1.1.1.19  root      962:             if (val & (1UL << bit)) {
1.1.1.18  root      963:                 bs->dirty_count--;
1.1.1.19  root      964:                 val &= ~(1UL << bit);
1.1.1.18  root      965:             }
1.1.1.14  root      966:         }
                    967:         bs->dirty_bitmap[idx] = val;
                    968:     }
                    969: }
                    970: 
1.1.1.6   root      971: /* Return < 0 if error. Important errors are:
1.1.1.5   root      972:   -EIO         generic I/O error (may happen for all errors)
                    973:   -ENOMEDIUM   No media inserted.
                    974:   -EINVAL      Invalid sector number or nb_sectors
                    975:   -EACCES      Trying to write a read-only device
                    976: */
1.1.1.6   root      977: int bdrv_write(BlockDriverState *bs, int64_t sector_num,
1.1       root      978:                const uint8_t *buf, int nb_sectors)
                    979: {
1.1.1.5   root      980:     BlockDriver *drv = bs->drv;
                    981:     if (!bs->drv)
                    982:         return -ENOMEDIUM;
1.1       root      983:     if (bs->read_only)
1.1.1.5   root      984:         return -EACCES;
1.1.1.7   root      985:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                    986:         return -EIO;
                    987: 
1.1.1.14  root      988:     if (bs->dirty_bitmap) {
                    989:         set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
                    990:     }
                    991: 
1.1.1.18  root      992:     if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
                    993:         bs->wr_highest_sector = sector_num + nb_sectors - 1;
                    994:     }
                    995: 
1.1.1.7   root      996:     return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
1.1       root      997: }
                    998: 
1.1.1.13  root      999: int bdrv_pread(BlockDriverState *bs, int64_t offset,
                   1000:                void *buf, int count1)
1.1.1.5   root     1001: {
1.1.1.14  root     1002:     uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5   root     1003:     int len, nb_sectors, count;
                   1004:     int64_t sector_num;
1.1.1.15  root     1005:     int ret;
1.1.1.5   root     1006: 
                   1007:     count = count1;
                   1008:     /* first read to align to sector start */
1.1.1.14  root     1009:     len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5   root     1010:     if (len > count)
                   1011:         len = count;
1.1.1.14  root     1012:     sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5   root     1013:     if (len > 0) {
1.1.1.15  root     1014:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1015:             return ret;
1.1.1.14  root     1016:         memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1.1.1.5   root     1017:         count -= len;
                   1018:         if (count == 0)
                   1019:             return count1;
                   1020:         sector_num++;
                   1021:         buf += len;
                   1022:     }
                   1023: 
                   1024:     /* read the sectors "in place" */
1.1.1.14  root     1025:     nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5   root     1026:     if (nb_sectors > 0) {
1.1.1.15  root     1027:         if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
                   1028:             return ret;
1.1.1.5   root     1029:         sector_num += nb_sectors;
1.1.1.14  root     1030:         len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5   root     1031:         buf += len;
                   1032:         count -= len;
                   1033:     }
                   1034: 
                   1035:     /* add data from the last sector */
                   1036:     if (count > 0) {
1.1.1.15  root     1037:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1038:             return ret;
1.1.1.5   root     1039:         memcpy(buf, tmp_buf, count);
                   1040:     }
                   1041:     return count1;
                   1042: }
                   1043: 
1.1.1.13  root     1044: int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                   1045:                 const void *buf, int count1)
1.1.1.5   root     1046: {
1.1.1.14  root     1047:     uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1.1.1.5   root     1048:     int len, nb_sectors, count;
                   1049:     int64_t sector_num;
1.1.1.15  root     1050:     int ret;
1.1.1.5   root     1051: 
                   1052:     count = count1;
                   1053:     /* first write to align to sector start */
1.1.1.14  root     1054:     len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1.1.1.5   root     1055:     if (len > count)
                   1056:         len = count;
1.1.1.14  root     1057:     sector_num = offset >> BDRV_SECTOR_BITS;
1.1.1.5   root     1058:     if (len > 0) {
1.1.1.15  root     1059:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1060:             return ret;
1.1.1.14  root     1061:         memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1.1.1.15  root     1062:         if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
                   1063:             return ret;
1.1.1.5   root     1064:         count -= len;
                   1065:         if (count == 0)
                   1066:             return count1;
                   1067:         sector_num++;
                   1068:         buf += len;
                   1069:     }
                   1070: 
                   1071:     /* write the sectors "in place" */
1.1.1.14  root     1072:     nb_sectors = count >> BDRV_SECTOR_BITS;
1.1.1.5   root     1073:     if (nb_sectors > 0) {
1.1.1.15  root     1074:         if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
                   1075:             return ret;
1.1.1.5   root     1076:         sector_num += nb_sectors;
1.1.1.14  root     1077:         len = nb_sectors << BDRV_SECTOR_BITS;
1.1.1.5   root     1078:         buf += len;
                   1079:         count -= len;
                   1080:     }
                   1081: 
                   1082:     /* add data from the last sector */
                   1083:     if (count > 0) {
1.1.1.15  root     1084:         if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
                   1085:             return ret;
1.1.1.5   root     1086:         memcpy(tmp_buf, buf, count);
1.1.1.15  root     1087:         if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
                   1088:             return ret;
1.1.1.5   root     1089:     }
                   1090:     return count1;
                   1091: }
                   1092: 
1.1.1.17  root     1093: /*
                   1094:  * Writes to the file and ensures that no writes are reordered across this
                   1095:  * request (acts as a barrier)
                   1096:  *
                   1097:  * Returns 0 on success, -errno in error cases.
                   1098:  */
                   1099: int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
                   1100:     const void *buf, int count)
                   1101: {
                   1102:     int ret;
                   1103: 
                   1104:     ret = bdrv_pwrite(bs, offset, buf, count);
                   1105:     if (ret < 0) {
                   1106:         return ret;
                   1107:     }
                   1108: 
                   1109:     /* No flush needed for cache=writethrough, it uses O_DSYNC */
                   1110:     if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
                   1111:         bdrv_flush(bs);
                   1112:     }
                   1113: 
                   1114:     return 0;
                   1115: }
                   1116: 
                   1117: /*
                   1118:  * Writes to the file and ensures that no writes are reordered across this
                   1119:  * request (acts as a barrier)
                   1120:  *
                   1121:  * Returns 0 on success, -errno in error cases.
                   1122:  */
                   1123: int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
                   1124:     const uint8_t *buf, int nb_sectors)
                   1125: {
                   1126:     return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
                   1127:         buf, BDRV_SECTOR_SIZE * nb_sectors);
                   1128: }
                   1129: 
1.1.1.5   root     1130: /**
                   1131:  * Truncate file to 'offset' bytes (needed only for file protocols)
                   1132:  */
                   1133: int bdrv_truncate(BlockDriverState *bs, int64_t offset)
                   1134: {
                   1135:     BlockDriver *drv = bs->drv;
1.1.1.18  root     1136:     int ret;
1.1.1.5   root     1137:     if (!drv)
                   1138:         return -ENOMEDIUM;
                   1139:     if (!drv->bdrv_truncate)
                   1140:         return -ENOTSUP;
1.1.1.14  root     1141:     if (bs->read_only)
                   1142:         return -EACCES;
1.1.1.19  root     1143:     if (bdrv_in_use(bs))
                   1144:         return -EBUSY;
1.1.1.18  root     1145:     ret = drv->bdrv_truncate(bs, offset);
                   1146:     if (ret == 0) {
                   1147:         ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1.1.1.19  root     1148:         if (bs->change_cb) {
                   1149:             bs->change_cb(bs->change_opaque, CHANGE_SIZE);
                   1150:         }
1.1.1.18  root     1151:     }
                   1152:     return ret;
1.1.1.5   root     1153: }
                   1154: 
                   1155: /**
                   1156:  * Length of a file in bytes. Return < 0 if error or unknown.
                   1157:  */
                   1158: int64_t bdrv_getlength(BlockDriverState *bs)
                   1159: {
                   1160:     BlockDriver *drv = bs->drv;
                   1161:     if (!drv)
                   1162:         return -ENOMEDIUM;
1.1.1.18  root     1163: 
                   1164:     /* Fixed size devices use the total_sectors value for speed instead of
                   1165:        issuing a length query (like lseek) on each call.  Also, legacy block
                   1166:        drivers don't provide a bdrv_getlength function and must use
                   1167:        total_sectors. */
                   1168:     if (!bs->growable || !drv->bdrv_getlength) {
1.1.1.14  root     1169:         return bs->total_sectors * BDRV_SECTOR_SIZE;
1.1.1.5   root     1170:     }
                   1171:     return drv->bdrv_getlength(bs);
                   1172: }
                   1173: 
                   1174: /* return 0 as number of sectors if no device present or error */
1.1.1.6   root     1175: void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1.1       root     1176: {
1.1.1.5   root     1177:     int64_t length;
                   1178:     length = bdrv_getlength(bs);
                   1179:     if (length < 0)
                   1180:         length = 0;
                   1181:     else
1.1.1.14  root     1182:         length = length >> BDRV_SECTOR_BITS;
1.1.1.5   root     1183:     *nb_sectors_ptr = length;
1.1       root     1184: }
                   1185: 
1.1.1.7   root     1186: struct partition {
                   1187:         uint8_t boot_ind;           /* 0x80 - active */
                   1188:         uint8_t head;               /* starting head */
                   1189:         uint8_t sector;             /* starting sector */
                   1190:         uint8_t cyl;                /* starting cylinder */
                   1191:         uint8_t sys_ind;            /* What partition type */
                   1192:         uint8_t end_head;           /* end head */
                   1193:         uint8_t end_sector;         /* end sector */
                   1194:         uint8_t end_cyl;            /* end cylinder */
                   1195:         uint32_t start_sect;        /* starting sector counting from 0 */
                   1196:         uint32_t nr_sects;          /* nr of sectors in partition */
                   1197: } __attribute__((packed));
                   1198: 
                   1199: /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
                   1200: static int guess_disk_lchs(BlockDriverState *bs,
                   1201:                            int *pcylinders, int *pheads, int *psectors)
                   1202: {
1.1.1.18  root     1203:     uint8_t buf[BDRV_SECTOR_SIZE];
1.1.1.7   root     1204:     int ret, i, heads, sectors, cylinders;
                   1205:     struct partition *p;
                   1206:     uint32_t nr_sects;
                   1207:     uint64_t nb_sectors;
                   1208: 
                   1209:     bdrv_get_geometry(bs, &nb_sectors);
                   1210: 
                   1211:     ret = bdrv_read(bs, 0, buf, 1);
                   1212:     if (ret < 0)
                   1213:         return -1;
                   1214:     /* test msdos magic */
                   1215:     if (buf[510] != 0x55 || buf[511] != 0xaa)
                   1216:         return -1;
                   1217:     for(i = 0; i < 4; i++) {
                   1218:         p = ((struct partition *)(buf + 0x1be)) + i;
                   1219:         nr_sects = le32_to_cpu(p->nr_sects);
                   1220:         if (nr_sects && p->end_head) {
                   1221:             /* We make the assumption that the partition terminates on
                   1222:                a cylinder boundary */
                   1223:             heads = p->end_head + 1;
                   1224:             sectors = p->end_sector & 63;
                   1225:             if (sectors == 0)
                   1226:                 continue;
                   1227:             cylinders = nb_sectors / (heads * sectors);
                   1228:             if (cylinders < 1 || cylinders > 16383)
                   1229:                 continue;
                   1230:             *pheads = heads;
                   1231:             *psectors = sectors;
                   1232:             *pcylinders = cylinders;
                   1233: #if 0
                   1234:             printf("guessed geometry: LCHS=%d %d %d\n",
                   1235:                    cylinders, heads, sectors);
                   1236: #endif
                   1237:             return 0;
                   1238:         }
                   1239:     }
                   1240:     return -1;
                   1241: }
                   1242: 
                   1243: void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1.1       root     1244: {
1.1.1.7   root     1245:     int translation, lba_detected = 0;
                   1246:     int cylinders, heads, secs;
                   1247:     uint64_t nb_sectors;
                   1248: 
                   1249:     /* if a geometry hint is available, use it */
                   1250:     bdrv_get_geometry(bs, &nb_sectors);
                   1251:     bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
                   1252:     translation = bdrv_get_translation_hint(bs);
                   1253:     if (cylinders != 0) {
                   1254:         *pcyls = cylinders;
                   1255:         *pheads = heads;
                   1256:         *psecs = secs;
                   1257:     } else {
                   1258:         if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
                   1259:             if (heads > 16) {
                   1260:                 /* if heads > 16, it means that a BIOS LBA
                   1261:                    translation was active, so the default
                   1262:                    hardware geometry is OK */
                   1263:                 lba_detected = 1;
                   1264:                 goto default_geometry;
                   1265:             } else {
                   1266:                 *pcyls = cylinders;
                   1267:                 *pheads = heads;
                   1268:                 *psecs = secs;
                   1269:                 /* disable any translation to be in sync with
                   1270:                    the logical geometry */
                   1271:                 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
                   1272:                     bdrv_set_translation_hint(bs,
                   1273:                                               BIOS_ATA_TRANSLATION_NONE);
                   1274:                 }
                   1275:             }
                   1276:         } else {
                   1277:         default_geometry:
                   1278:             /* if no geometry, use a standard physical disk geometry */
                   1279:             cylinders = nb_sectors / (16 * 63);
                   1280: 
                   1281:             if (cylinders > 16383)
                   1282:                 cylinders = 16383;
                   1283:             else if (cylinders < 2)
                   1284:                 cylinders = 2;
                   1285:             *pcyls = cylinders;
                   1286:             *pheads = 16;
                   1287:             *psecs = 63;
                   1288:             if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
                   1289:                 if ((*pcyls * *pheads) <= 131072) {
                   1290:                     bdrv_set_translation_hint(bs,
                   1291:                                               BIOS_ATA_TRANSLATION_LARGE);
                   1292:                 } else {
                   1293:                     bdrv_set_translation_hint(bs,
                   1294:                                               BIOS_ATA_TRANSLATION_LBA);
                   1295:                 }
                   1296:             }
                   1297:         }
                   1298:         bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
                   1299:     }
1.1       root     1300: }
                   1301: 
1.1.1.6   root     1302: void bdrv_set_geometry_hint(BlockDriverState *bs,
1.1       root     1303:                             int cyls, int heads, int secs)
                   1304: {
                   1305:     bs->cyls = cyls;
                   1306:     bs->heads = heads;
                   1307:     bs->secs = secs;
                   1308: }
                   1309: 
                   1310: void bdrv_set_type_hint(BlockDriverState *bs, int type)
                   1311: {
                   1312:     bs->type = type;
                   1313:     bs->removable = ((type == BDRV_TYPE_CDROM ||
                   1314:                       type == BDRV_TYPE_FLOPPY));
                   1315: }
                   1316: 
                   1317: void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
                   1318: {
                   1319:     bs->translation = translation;
                   1320: }
                   1321: 
1.1.1.6   root     1322: void bdrv_get_geometry_hint(BlockDriverState *bs,
1.1       root     1323:                             int *pcyls, int *pheads, int *psecs)
                   1324: {
                   1325:     *pcyls = bs->cyls;
                   1326:     *pheads = bs->heads;
                   1327:     *psecs = bs->secs;
                   1328: }
                   1329: 
                   1330: int bdrv_get_type_hint(BlockDriverState *bs)
                   1331: {
                   1332:     return bs->type;
                   1333: }
                   1334: 
                   1335: int bdrv_get_translation_hint(BlockDriverState *bs)
                   1336: {
                   1337:     return bs->translation;
                   1338: }
                   1339: 
1.1.1.18  root     1340: void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
                   1341:                        BlockErrorAction on_write_error)
                   1342: {
                   1343:     bs->on_read_error = on_read_error;
                   1344:     bs->on_write_error = on_write_error;
                   1345: }
                   1346: 
                   1347: BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
                   1348: {
                   1349:     return is_read ? bs->on_read_error : bs->on_write_error;
                   1350: }
                   1351: 
                   1352: void bdrv_set_removable(BlockDriverState *bs, int removable)
                   1353: {
                   1354:     bs->removable = removable;
                   1355:     if (removable && bs == bs_snapshots) {
                   1356:         bs_snapshots = NULL;
                   1357:     }
                   1358: }
                   1359: 
1.1       root     1360: int bdrv_is_removable(BlockDriverState *bs)
                   1361: {
                   1362:     return bs->removable;
                   1363: }
                   1364: 
                   1365: int bdrv_is_read_only(BlockDriverState *bs)
                   1366: {
                   1367:     return bs->read_only;
                   1368: }
                   1369: 
1.1.1.6   root     1370: int bdrv_is_sg(BlockDriverState *bs)
                   1371: {
                   1372:     return bs->sg;
                   1373: }
                   1374: 
1.1.1.14  root     1375: int bdrv_enable_write_cache(BlockDriverState *bs)
                   1376: {
                   1377:     return bs->enable_write_cache;
                   1378: }
                   1379: 
1.1.1.5   root     1380: /* XXX: no longer used */
1.1.1.6   root     1381: void bdrv_set_change_cb(BlockDriverState *bs,
1.1.1.19  root     1382:                         void (*change_cb)(void *opaque, int reason),
                   1383:                         void *opaque)
1.1       root     1384: {
                   1385:     bs->change_cb = change_cb;
                   1386:     bs->change_opaque = opaque;
                   1387: }
                   1388: 
                   1389: int bdrv_is_encrypted(BlockDriverState *bs)
                   1390: {
                   1391:     if (bs->backing_hd && bs->backing_hd->encrypted)
                   1392:         return 1;
                   1393:     return bs->encrypted;
                   1394: }
                   1395: 
1.1.1.8   root     1396: int bdrv_key_required(BlockDriverState *bs)
                   1397: {
                   1398:     BlockDriverState *backing_hd = bs->backing_hd;
                   1399: 
                   1400:     if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
                   1401:         return 1;
                   1402:     return (bs->encrypted && !bs->valid_key);
                   1403: }
                   1404: 
1.1       root     1405: int bdrv_set_key(BlockDriverState *bs, const char *key)
                   1406: {
                   1407:     int ret;
                   1408:     if (bs->backing_hd && bs->backing_hd->encrypted) {
                   1409:         ret = bdrv_set_key(bs->backing_hd, key);
                   1410:         if (ret < 0)
                   1411:             return ret;
                   1412:         if (!bs->encrypted)
                   1413:             return 0;
                   1414:     }
1.1.1.18  root     1415:     if (!bs->encrypted) {
                   1416:         return -EINVAL;
                   1417:     } else if (!bs->drv || !bs->drv->bdrv_set_key) {
                   1418:         return -ENOMEDIUM;
                   1419:     }
1.1.1.8   root     1420:     ret = bs->drv->bdrv_set_key(bs, key);
1.1.1.13  root     1421:     if (ret < 0) {
                   1422:         bs->valid_key = 0;
                   1423:     } else if (!bs->valid_key) {
                   1424:         bs->valid_key = 1;
                   1425:         /* call the change callback now, we skipped it on open */
                   1426:         bs->media_changed = 1;
                   1427:         if (bs->change_cb)
1.1.1.19  root     1428:             bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1.1.1.13  root     1429:     }
1.1.1.8   root     1430:     return ret;
1.1       root     1431: }
                   1432: 
                   1433: void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
                   1434: {
1.1.1.5   root     1435:     if (!bs->drv) {
1.1       root     1436:         buf[0] = '\0';
                   1437:     } else {
                   1438:         pstrcpy(buf, buf_size, bs->drv->format_name);
                   1439:     }
                   1440: }
                   1441: 
1.1.1.6   root     1442: void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1.1       root     1443:                          void *opaque)
                   1444: {
                   1445:     BlockDriver *drv;
                   1446: 
1.1.1.18  root     1447:     QLIST_FOREACH(drv, &bdrv_drivers, list) {
1.1       root     1448:         it(opaque, drv->format_name);
                   1449:     }
                   1450: }
                   1451: 
                   1452: BlockDriverState *bdrv_find(const char *name)
                   1453: {
                   1454:     BlockDriverState *bs;
                   1455: 
1.1.1.18  root     1456:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                   1457:         if (!strcmp(name, bs->device_name)) {
1.1       root     1458:             return bs;
1.1.1.18  root     1459:         }
1.1       root     1460:     }
                   1461:     return NULL;
                   1462: }
                   1463: 
1.1.1.18  root     1464: BlockDriverState *bdrv_next(BlockDriverState *bs)
                   1465: {
                   1466:     if (!bs) {
                   1467:         return QTAILQ_FIRST(&bdrv_states);
                   1468:     }
                   1469:     return QTAILQ_NEXT(bs, list);
                   1470: }
                   1471: 
1.1.1.8   root     1472: void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1.1       root     1473: {
                   1474:     BlockDriverState *bs;
                   1475: 
1.1.1.18  root     1476:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.8   root     1477:         it(opaque, bs);
1.1       root     1478:     }
                   1479: }
                   1480: 
                   1481: const char *bdrv_get_device_name(BlockDriverState *bs)
                   1482: {
                   1483:     return bs->device_name;
                   1484: }
                   1485: 
1.1.1.19  root     1486: int bdrv_flush(BlockDriverState *bs)
1.1.1.4   root     1487: {
1.1.1.18  root     1488:     if (bs->open_flags & BDRV_O_NO_FLUSH) {
1.1.1.19  root     1489:         return 0;
                   1490:     }
                   1491: 
                   1492:     if (bs->drv && bs->drv->bdrv_flush) {
                   1493:         return bs->drv->bdrv_flush(bs);
1.1.1.18  root     1494:     }
                   1495: 
1.1.1.19  root     1496:     /*
                   1497:      * Some block drivers always operate in either writethrough or unsafe mode
                   1498:      * and don't support bdrv_flush therefore. Usually qemu doesn't know how
                   1499:      * the server works (because the behaviour is hardcoded or depends on
                   1500:      * server-side configuration), so we can't ensure that everything is safe
                   1501:      * on disk. Returning an error doesn't work because that would break guests
                   1502:      * even if the server operates in writethrough mode.
                   1503:      *
                   1504:      * Let's hope the user knows what he's doing.
                   1505:      */
                   1506:     return 0;
1.1.1.4   root     1507: }
                   1508: 
1.1.1.7   root     1509: void bdrv_flush_all(void)
                   1510: {
                   1511:     BlockDriverState *bs;
                   1512: 
1.1.1.18  root     1513:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                   1514:         if (bs->drv && !bdrv_is_read_only(bs) &&
                   1515:             (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1.1.1.7   root     1516:             bdrv_flush(bs);
1.1.1.18  root     1517:         }
                   1518:     }
                   1519: }
                   1520: 
                   1521: int bdrv_has_zero_init(BlockDriverState *bs)
                   1522: {
                   1523:     assert(bs->drv);
                   1524: 
                   1525:     if (bs->drv->bdrv_has_zero_init) {
                   1526:         return bs->drv->bdrv_has_zero_init(bs);
                   1527:     }
                   1528: 
                   1529:     return 1;
1.1.1.7   root     1530: }
                   1531: 
1.1.1.19  root     1532: int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
                   1533: {
                   1534:     if (!bs->drv) {
                   1535:         return -ENOMEDIUM;
                   1536:     }
                   1537:     if (!bs->drv->bdrv_discard) {
                   1538:         return 0;
                   1539:     }
                   1540:     return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
                   1541: }
                   1542: 
1.1.1.7   root     1543: /*
                   1544:  * Returns true iff the specified sector is present in the disk image. Drivers
                   1545:  * not implementing the functionality are assumed to not support backing files,
                   1546:  * hence all their sectors are reported as allocated.
                   1547:  *
                   1548:  * 'pnum' is set to the number of sectors (including and immediately following
                   1549:  * the specified sector) that are known to be in the same
                   1550:  * allocated/unallocated state.
                   1551:  *
                   1552:  * 'nb_sectors' is the max value 'pnum' should be set to.
                   1553:  */
                   1554: int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
                   1555:        int *pnum)
                   1556: {
                   1557:     int64_t n;
                   1558:     if (!bs->drv->bdrv_is_allocated) {
                   1559:         if (sector_num >= bs->total_sectors) {
                   1560:             *pnum = 0;
                   1561:             return 0;
                   1562:         }
                   1563:         n = bs->total_sectors - sector_num;
                   1564:         *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
                   1565:         return 1;
                   1566:     }
                   1567:     return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
                   1568: }
                   1569: 
1.1.1.18  root     1570: void bdrv_mon_event(const BlockDriverState *bdrv,
                   1571:                     BlockMonEventAction action, int is_read)
                   1572: {
                   1573:     QObject *data;
                   1574:     const char *action_str;
                   1575: 
                   1576:     switch (action) {
                   1577:     case BDRV_ACTION_REPORT:
                   1578:         action_str = "report";
                   1579:         break;
                   1580:     case BDRV_ACTION_IGNORE:
                   1581:         action_str = "ignore";
                   1582:         break;
                   1583:     case BDRV_ACTION_STOP:
                   1584:         action_str = "stop";
                   1585:         break;
                   1586:     default:
                   1587:         abort();
                   1588:     }
                   1589: 
                   1590:     data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
                   1591:                               bdrv->device_name,
                   1592:                               action_str,
                   1593:                               is_read ? "read" : "write");
                   1594:     monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
                   1595: 
                   1596:     qobject_decref(data);
                   1597: }
                   1598: 
1.1.1.14  root     1599: static void bdrv_print_dict(QObject *obj, void *opaque)
1.1       root     1600: {
1.1.1.14  root     1601:     QDict *bs_dict;
                   1602:     Monitor *mon = opaque;
                   1603: 
                   1604:     bs_dict = qobject_to_qdict(obj);
                   1605: 
                   1606:     monitor_printf(mon, "%s: type=%s removable=%d",
                   1607:                         qdict_get_str(bs_dict, "device"),
                   1608:                         qdict_get_str(bs_dict, "type"),
                   1609:                         qdict_get_bool(bs_dict, "removable"));
                   1610: 
                   1611:     if (qdict_get_bool(bs_dict, "removable")) {
                   1612:         monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
                   1613:     }
                   1614: 
                   1615:     if (qdict_haskey(bs_dict, "inserted")) {
                   1616:         QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
                   1617: 
                   1618:         monitor_printf(mon, " file=");
                   1619:         monitor_print_filename(mon, qdict_get_str(qdict, "file"));
                   1620:         if (qdict_haskey(qdict, "backing_file")) {
                   1621:             monitor_printf(mon, " backing_file=");
                   1622:             monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
                   1623:         }
                   1624:         monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
                   1625:                             qdict_get_bool(qdict, "ro"),
                   1626:                             qdict_get_str(qdict, "drv"),
                   1627:                             qdict_get_bool(qdict, "encrypted"));
                   1628:     } else {
                   1629:         monitor_printf(mon, " [not inserted]");
                   1630:     }
                   1631: 
                   1632:     monitor_printf(mon, "\n");
                   1633: }
                   1634: 
                   1635: void bdrv_info_print(Monitor *mon, const QObject *data)
                   1636: {
                   1637:     qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
                   1638: }
                   1639: 
                   1640: void bdrv_info(Monitor *mon, QObject **ret_data)
                   1641: {
                   1642:     QList *bs_list;
1.1       root     1643:     BlockDriverState *bs;
                   1644: 
1.1.1.14  root     1645:     bs_list = qlist_new();
                   1646: 
1.1.1.18  root     1647:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
1.1.1.14  root     1648:         QObject *bs_obj;
                   1649:         const char *type = "unknown";
                   1650: 
1.1       root     1651:         switch(bs->type) {
                   1652:         case BDRV_TYPE_HD:
1.1.1.14  root     1653:             type = "hd";
1.1       root     1654:             break;
                   1655:         case BDRV_TYPE_CDROM:
1.1.1.14  root     1656:             type = "cdrom";
1.1       root     1657:             break;
                   1658:         case BDRV_TYPE_FLOPPY:
1.1.1.14  root     1659:             type = "floppy";
1.1       root     1660:             break;
                   1661:         }
1.1.1.14  root     1662: 
                   1663:         bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
                   1664:                                     "'removable': %i, 'locked': %i }",
                   1665:                                     bs->device_name, type, bs->removable,
                   1666:                                     bs->locked);
                   1667: 
1.1.1.5   root     1668:         if (bs->drv) {
1.1.1.14  root     1669:             QObject *obj;
                   1670:             QDict *bs_dict = qobject_to_qdict(bs_obj);
                   1671: 
                   1672:             obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
                   1673:                                      "'encrypted': %i }",
                   1674:                                      bs->filename, bs->read_only,
                   1675:                                      bs->drv->format_name,
                   1676:                                      bdrv_is_encrypted(bs));
1.1.1.5   root     1677:             if (bs->backing_file[0] != '\0') {
1.1.1.14  root     1678:                 QDict *qdict = qobject_to_qdict(obj);
                   1679:                 qdict_put(qdict, "backing_file",
                   1680:                           qstring_from_str(bs->backing_file));
1.1.1.13  root     1681:             }
1.1.1.14  root     1682: 
                   1683:             qdict_put_obj(bs_dict, "inserted", obj);
1.1       root     1684:         }
1.1.1.14  root     1685:         qlist_append_obj(bs_list, bs_obj);
1.1       root     1686:     }
1.1.1.14  root     1687: 
                   1688:     *ret_data = QOBJECT(bs_list);
                   1689: }
                   1690: 
                   1691: static void bdrv_stats_iter(QObject *data, void *opaque)
                   1692: {
                   1693:     QDict *qdict;
                   1694:     Monitor *mon = opaque;
                   1695: 
                   1696:     qdict = qobject_to_qdict(data);
                   1697:     monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
                   1698: 
                   1699:     qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
                   1700:     monitor_printf(mon, " rd_bytes=%" PRId64
                   1701:                         " wr_bytes=%" PRId64
                   1702:                         " rd_operations=%" PRId64
                   1703:                         " wr_operations=%" PRId64
                   1704:                         "\n",
                   1705:                         qdict_get_int(qdict, "rd_bytes"),
                   1706:                         qdict_get_int(qdict, "wr_bytes"),
                   1707:                         qdict_get_int(qdict, "rd_operations"),
                   1708:                         qdict_get_int(qdict, "wr_operations"));
                   1709: }
                   1710: 
                   1711: void bdrv_stats_print(Monitor *mon, const QObject *data)
                   1712: {
                   1713:     qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1.1       root     1714: }
                   1715: 
1.1.1.18  root     1716: static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
                   1717: {
                   1718:     QObject *res;
                   1719:     QDict *dict;
                   1720: 
                   1721:     res = qobject_from_jsonf("{ 'stats': {"
                   1722:                              "'rd_bytes': %" PRId64 ","
                   1723:                              "'wr_bytes': %" PRId64 ","
                   1724:                              "'rd_operations': %" PRId64 ","
                   1725:                              "'wr_operations': %" PRId64 ","
                   1726:                              "'wr_highest_offset': %" PRId64
                   1727:                              "} }",
                   1728:                              bs->rd_bytes, bs->wr_bytes,
                   1729:                              bs->rd_ops, bs->wr_ops,
                   1730:                              bs->wr_highest_sector *
                   1731:                              (uint64_t)BDRV_SECTOR_SIZE);
                   1732:     dict  = qobject_to_qdict(res);
                   1733: 
                   1734:     if (*bs->device_name) {
                   1735:         qdict_put(dict, "device", qstring_from_str(bs->device_name));
                   1736:     }
                   1737: 
                   1738:     if (bs->file) {
                   1739:         QObject *parent = bdrv_info_stats_bs(bs->file);
                   1740:         qdict_put_obj(dict, "parent", parent);
                   1741:     }
                   1742: 
                   1743:     return res;
                   1744: }
                   1745: 
1.1.1.14  root     1746: void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1.1.1.6   root     1747: {
1.1.1.14  root     1748:     QObject *obj;
                   1749:     QList *devices;
1.1.1.6   root     1750:     BlockDriverState *bs;
                   1751: 
1.1.1.14  root     1752:     devices = qlist_new();
                   1753: 
1.1.1.18  root     1754:     QTAILQ_FOREACH(bs, &bdrv_states, list) {
                   1755:         obj = bdrv_info_stats_bs(bs);
1.1.1.14  root     1756:         qlist_append_obj(devices, obj);
1.1.1.6   root     1757:     }
1.1.1.14  root     1758: 
                   1759:     *ret_data = QOBJECT(devices);
1.1.1.6   root     1760: }
                   1761: 
1.1.1.8   root     1762: const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
                   1763: {
                   1764:     if (bs->backing_hd && bs->backing_hd->encrypted)
                   1765:         return bs->backing_file;
                   1766:     else if (bs->encrypted)
                   1767:         return bs->filename;
                   1768:     else
                   1769:         return NULL;
                   1770: }
                   1771: 
1.1.1.6   root     1772: void bdrv_get_backing_filename(BlockDriverState *bs,
1.1.1.5   root     1773:                                char *filename, int filename_size)
                   1774: {
1.1.1.18  root     1775:     if (!bs->backing_file) {
1.1.1.5   root     1776:         pstrcpy(filename, filename_size, "");
                   1777:     } else {
                   1778:         pstrcpy(filename, filename_size, bs->backing_file);
                   1779:     }
                   1780: }
                   1781: 
1.1.1.6   root     1782: int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1.1.1.5   root     1783:                           const uint8_t *buf, int nb_sectors)
                   1784: {
                   1785:     BlockDriver *drv = bs->drv;
                   1786:     if (!drv)
                   1787:         return -ENOMEDIUM;
                   1788:     if (!drv->bdrv_write_compressed)
                   1789:         return -ENOTSUP;
1.1.1.11  root     1790:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                   1791:         return -EIO;
1.1.1.14  root     1792: 
                   1793:     if (bs->dirty_bitmap) {
                   1794:         set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
                   1795:     }
                   1796: 
1.1.1.5   root     1797:     return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
                   1798: }
1.1.1.6   root     1799: 
1.1.1.5   root     1800: int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
                   1801: {
                   1802:     BlockDriver *drv = bs->drv;
                   1803:     if (!drv)
                   1804:         return -ENOMEDIUM;
                   1805:     if (!drv->bdrv_get_info)
                   1806:         return -ENOTSUP;
                   1807:     memset(bdi, 0, sizeof(*bdi));
                   1808:     return drv->bdrv_get_info(bs, bdi);
                   1809: }
                   1810: 
1.1.1.13  root     1811: int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
                   1812:                       int64_t pos, int size)
1.1.1.9   root     1813: {
                   1814:     BlockDriver *drv = bs->drv;
                   1815:     if (!drv)
                   1816:         return -ENOMEDIUM;
1.1.1.18  root     1817:     if (drv->bdrv_save_vmstate)
                   1818:         return drv->bdrv_save_vmstate(bs, buf, pos, size);
                   1819:     if (bs->file)
                   1820:         return bdrv_save_vmstate(bs->file, buf, pos, size);
                   1821:     return -ENOTSUP;
1.1.1.9   root     1822: }
                   1823: 
1.1.1.13  root     1824: int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
                   1825:                       int64_t pos, int size)
1.1.1.9   root     1826: {
                   1827:     BlockDriver *drv = bs->drv;
                   1828:     if (!drv)
                   1829:         return -ENOMEDIUM;
1.1.1.18  root     1830:     if (drv->bdrv_load_vmstate)
                   1831:         return drv->bdrv_load_vmstate(bs, buf, pos, size);
                   1832:     if (bs->file)
                   1833:         return bdrv_load_vmstate(bs->file, buf, pos, size);
                   1834:     return -ENOTSUP;
                   1835: }
                   1836: 
                   1837: void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
                   1838: {
                   1839:     BlockDriver *drv = bs->drv;
                   1840: 
                   1841:     if (!drv || !drv->bdrv_debug_event) {
                   1842:         return;
                   1843:     }
                   1844: 
                   1845:     return drv->bdrv_debug_event(bs, event);
                   1846: 
1.1.1.9   root     1847: }
                   1848: 
1.1       root     1849: /**************************************************************/
1.1.1.5   root     1850: /* handling of snapshots */
1.1       root     1851: 
1.1.1.18  root     1852: int bdrv_can_snapshot(BlockDriverState *bs)
                   1853: {
                   1854:     BlockDriver *drv = bs->drv;
                   1855:     if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
                   1856:         return 0;
                   1857:     }
                   1858: 
                   1859:     if (!drv->bdrv_snapshot_create) {
                   1860:         if (bs->file != NULL) {
                   1861:             return bdrv_can_snapshot(bs->file);
                   1862:         }
                   1863:         return 0;
                   1864:     }
                   1865: 
                   1866:     return 1;
                   1867: }
                   1868: 
                   1869: int bdrv_is_snapshot(BlockDriverState *bs)
                   1870: {
                   1871:     return !!(bs->open_flags & BDRV_O_SNAPSHOT);
                   1872: }
                   1873: 
                   1874: BlockDriverState *bdrv_snapshots(void)
                   1875: {
                   1876:     BlockDriverState *bs;
                   1877: 
                   1878:     if (bs_snapshots) {
                   1879:         return bs_snapshots;
                   1880:     }
                   1881: 
                   1882:     bs = NULL;
                   1883:     while ((bs = bdrv_next(bs))) {
                   1884:         if (bdrv_can_snapshot(bs)) {
                   1885:             bs_snapshots = bs;
                   1886:             return bs;
                   1887:         }
                   1888:     }
                   1889:     return NULL;
                   1890: }
                   1891: 
1.1.1.6   root     1892: int bdrv_snapshot_create(BlockDriverState *bs,
1.1.1.5   root     1893:                          QEMUSnapshotInfo *sn_info)
                   1894: {
                   1895:     BlockDriver *drv = bs->drv;
                   1896:     if (!drv)
                   1897:         return -ENOMEDIUM;
1.1.1.18  root     1898:     if (drv->bdrv_snapshot_create)
                   1899:         return drv->bdrv_snapshot_create(bs, sn_info);
                   1900:     if (bs->file)
                   1901:         return bdrv_snapshot_create(bs->file, sn_info);
                   1902:     return -ENOTSUP;
1.1.1.5   root     1903: }
1.1       root     1904: 
1.1.1.6   root     1905: int bdrv_snapshot_goto(BlockDriverState *bs,
1.1.1.5   root     1906:                        const char *snapshot_id)
1.1       root     1907: {
1.1.1.5   root     1908:     BlockDriver *drv = bs->drv;
1.1.1.18  root     1909:     int ret, open_ret;
                   1910: 
1.1.1.5   root     1911:     if (!drv)
                   1912:         return -ENOMEDIUM;
1.1.1.18  root     1913:     if (drv->bdrv_snapshot_goto)
                   1914:         return drv->bdrv_snapshot_goto(bs, snapshot_id);
                   1915: 
                   1916:     if (bs->file) {
                   1917:         drv->bdrv_close(bs);
                   1918:         ret = bdrv_snapshot_goto(bs->file, snapshot_id);
                   1919:         open_ret = drv->bdrv_open(bs, bs->open_flags);
                   1920:         if (open_ret < 0) {
                   1921:             bdrv_delete(bs->file);
                   1922:             bs->drv = NULL;
                   1923:             return open_ret;
                   1924:         }
                   1925:         return ret;
                   1926:     }
                   1927: 
                   1928:     return -ENOTSUP;
1.1       root     1929: }
                   1930: 
1.1.1.5   root     1931: int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1.1       root     1932: {
1.1.1.5   root     1933:     BlockDriver *drv = bs->drv;
                   1934:     if (!drv)
                   1935:         return -ENOMEDIUM;
1.1.1.18  root     1936:     if (drv->bdrv_snapshot_delete)
                   1937:         return drv->bdrv_snapshot_delete(bs, snapshot_id);
                   1938:     if (bs->file)
                   1939:         return bdrv_snapshot_delete(bs->file, snapshot_id);
                   1940:     return -ENOTSUP;
1.1.1.5   root     1941: }
1.1       root     1942: 
1.1.1.6   root     1943: int bdrv_snapshot_list(BlockDriverState *bs,
1.1.1.5   root     1944:                        QEMUSnapshotInfo **psn_info)
                   1945: {
                   1946:     BlockDriver *drv = bs->drv;
                   1947:     if (!drv)
                   1948:         return -ENOMEDIUM;
1.1.1.18  root     1949:     if (drv->bdrv_snapshot_list)
                   1950:         return drv->bdrv_snapshot_list(bs, psn_info);
                   1951:     if (bs->file)
                   1952:         return bdrv_snapshot_list(bs->file, psn_info);
                   1953:     return -ENOTSUP;
1.1.1.5   root     1954: }
                   1955: 
1.1.1.19  root     1956: int bdrv_snapshot_load_tmp(BlockDriverState *bs,
                   1957:         const char *snapshot_name)
                   1958: {
                   1959:     BlockDriver *drv = bs->drv;
                   1960:     if (!drv) {
                   1961:         return -ENOMEDIUM;
                   1962:     }
                   1963:     if (!bs->read_only) {
                   1964:         return -EINVAL;
                   1965:     }
                   1966:     if (drv->bdrv_snapshot_load_tmp) {
                   1967:         return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
                   1968:     }
                   1969:     return -ENOTSUP;
                   1970: }
                   1971: 
1.1.1.5   root     1972: #define NB_SUFFIXES 4
                   1973: 
                   1974: char *get_human_readable_size(char *buf, int buf_size, int64_t size)
                   1975: {
                   1976:     static const char suffixes[NB_SUFFIXES] = "KMGT";
                   1977:     int64_t base;
                   1978:     int i;
                   1979: 
                   1980:     if (size <= 999) {
                   1981:         snprintf(buf, buf_size, "%" PRId64, size);
                   1982:     } else {
                   1983:         base = 1024;
                   1984:         for(i = 0; i < NB_SUFFIXES; i++) {
                   1985:             if (size < (10 * base)) {
1.1.1.6   root     1986:                 snprintf(buf, buf_size, "%0.1f%c",
1.1.1.5   root     1987:                          (double)size / base,
                   1988:                          suffixes[i]);
                   1989:                 break;
                   1990:             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1.1.1.6   root     1991:                 snprintf(buf, buf_size, "%" PRId64 "%c",
1.1.1.5   root     1992:                          ((size + (base >> 1)) / base),
                   1993:                          suffixes[i]);
                   1994:                 break;
                   1995:             }
                   1996:             base = base * 1024;
                   1997:         }
1.1       root     1998:     }
1.1.1.5   root     1999:     return buf;
                   2000: }
                   2001: 
                   2002: char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
                   2003: {
                   2004:     char buf1[128], date_buf[128], clock_buf[128];
                   2005: #ifdef _WIN32
                   2006:     struct tm *ptm;
1.1.1.2   root     2007: #else
1.1.1.5   root     2008:     struct tm tm;
1.1.1.2   root     2009: #endif
1.1.1.5   root     2010:     time_t ti;
                   2011:     int64_t secs;
                   2012: 
                   2013:     if (!sn) {
1.1.1.6   root     2014:         snprintf(buf, buf_size,
                   2015:                  "%-10s%-20s%7s%20s%15s",
1.1.1.5   root     2016:                  "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
                   2017:     } else {
                   2018:         ti = sn->date_sec;
1.1       root     2019: #ifdef _WIN32
1.1.1.5   root     2020:         ptm = localtime(&ti);
                   2021:         strftime(date_buf, sizeof(date_buf),
                   2022:                  "%Y-%m-%d %H:%M:%S", ptm);
                   2023: #else
                   2024:         localtime_r(&ti, &tm);
                   2025:         strftime(date_buf, sizeof(date_buf),
                   2026:                  "%Y-%m-%d %H:%M:%S", &tm);
1.1       root     2027: #endif
1.1.1.5   root     2028:         secs = sn->vm_clock_nsec / 1000000000;
                   2029:         snprintf(clock_buf, sizeof(clock_buf),
                   2030:                  "%02d:%02d:%02d.%03d",
                   2031:                  (int)(secs / 3600),
                   2032:                  (int)((secs / 60) % 60),
1.1.1.6   root     2033:                  (int)(secs % 60),
1.1.1.5   root     2034:                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
                   2035:         snprintf(buf, buf_size,
1.1.1.6   root     2036:                  "%-10s%-20s%7s%20s%15s",
1.1.1.5   root     2037:                  sn->id_str, sn->name,
                   2038:                  get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
                   2039:                  date_buf,
                   2040:                  clock_buf);
                   2041:     }
                   2042:     return buf;
1.1       root     2043: }
                   2044: 
                   2045: 
1.1.1.5   root     2046: /**************************************************************/
                   2047: /* async I/Os */
                   2048: 
1.1.1.7   root     2049: BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1.1.1.13  root     2050:                                  QEMUIOVector *qiov, int nb_sectors,
1.1.1.7   root     2051:                                  BlockDriverCompletionFunc *cb, void *opaque)
                   2052: {
1.1.1.5   root     2053:     BlockDriver *drv = bs->drv;
1.1.1.6   root     2054:     BlockDriverAIOCB *ret;
1.1.1.5   root     2055: 
1.1.1.19  root     2056:     trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
                   2057: 
1.1.1.5   root     2058:     if (!drv)
                   2059:         return NULL;
1.1.1.7   root     2060:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                   2061:         return NULL;
1.1.1.5   root     2062: 
1.1.1.13  root     2063:     ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
                   2064:                               cb, opaque);
1.1.1.6   root     2065: 
                   2066:     if (ret) {
                   2067:        /* Update stats even though technically transfer has not happened. */
1.1.1.14  root     2068:        bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.6   root     2069:        bs->rd_ops ++;
                   2070:     }
                   2071: 
                   2072:     return ret;
1.1       root     2073: }
                   2074: 
1.1.1.19  root     2075: typedef struct BlockCompleteData {
                   2076:     BlockDriverCompletionFunc *cb;
                   2077:     void *opaque;
                   2078:     BlockDriverState *bs;
                   2079:     int64_t sector_num;
                   2080:     int nb_sectors;
                   2081: } BlockCompleteData;
                   2082: 
                   2083: static void block_complete_cb(void *opaque, int ret)
                   2084: {
                   2085:     BlockCompleteData *b = opaque;
                   2086: 
                   2087:     if (b->bs->dirty_bitmap) {
                   2088:         set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
                   2089:     }
                   2090:     b->cb(b->opaque, ret);
                   2091:     qemu_free(b);
                   2092: }
                   2093: 
                   2094: static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
                   2095:                                              int64_t sector_num,
                   2096:                                              int nb_sectors,
                   2097:                                              BlockDriverCompletionFunc *cb,
                   2098:                                              void *opaque)
                   2099: {
                   2100:     BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
                   2101: 
                   2102:     blkdata->bs = bs;
                   2103:     blkdata->cb = cb;
                   2104:     blkdata->opaque = opaque;
                   2105:     blkdata->sector_num = sector_num;
                   2106:     blkdata->nb_sectors = nb_sectors;
                   2107: 
                   2108:     return blkdata;
                   2109: }
                   2110: 
1.1.1.13  root     2111: BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
                   2112:                                   QEMUIOVector *qiov, int nb_sectors,
                   2113:                                   BlockDriverCompletionFunc *cb, void *opaque)
1.1       root     2114: {
1.1.1.5   root     2115:     BlockDriver *drv = bs->drv;
1.1.1.6   root     2116:     BlockDriverAIOCB *ret;
1.1.1.19  root     2117:     BlockCompleteData *blk_cb_data;
                   2118: 
                   2119:     trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
1.1       root     2120: 
1.1.1.5   root     2121:     if (!drv)
                   2122:         return NULL;
                   2123:     if (bs->read_only)
                   2124:         return NULL;
1.1.1.7   root     2125:     if (bdrv_check_request(bs, sector_num, nb_sectors))
                   2126:         return NULL;
1.1.1.4   root     2127: 
1.1.1.14  root     2128:     if (bs->dirty_bitmap) {
1.1.1.19  root     2129:         blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
                   2130:                                          opaque);
                   2131:         cb = &block_complete_cb;
                   2132:         opaque = blk_cb_data;
1.1.1.14  root     2133:     }
                   2134: 
1.1.1.13  root     2135:     ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
                   2136:                                cb, opaque);
1.1.1.6   root     2137: 
                   2138:     if (ret) {
1.1.1.18  root     2139:         /* Update stats even though technically transfer has not happened. */
                   2140:         bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
                   2141:         bs->wr_ops ++;
                   2142:         if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
                   2143:             bs->wr_highest_sector = sector_num + nb_sectors - 1;
                   2144:         }
1.1.1.6   root     2145:     }
                   2146: 
                   2147:     return ret;
1.1.1.5   root     2148: }
                   2149: 
1.1.1.14  root     2150: 
                   2151: typedef struct MultiwriteCB {
                   2152:     int error;
                   2153:     int num_requests;
                   2154:     int num_callbacks;
                   2155:     struct {
                   2156:         BlockDriverCompletionFunc *cb;
                   2157:         void *opaque;
                   2158:         QEMUIOVector *free_qiov;
                   2159:         void *free_buf;
                   2160:     } callbacks[];
                   2161: } MultiwriteCB;
                   2162: 
                   2163: static void multiwrite_user_cb(MultiwriteCB *mcb)
                   2164: {
                   2165:     int i;
                   2166: 
                   2167:     for (i = 0; i < mcb->num_callbacks; i++) {
                   2168:         mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1.1.1.16  root     2169:         if (mcb->callbacks[i].free_qiov) {
                   2170:             qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
                   2171:         }
1.1.1.14  root     2172:         qemu_free(mcb->callbacks[i].free_qiov);
1.1.1.15  root     2173:         qemu_vfree(mcb->callbacks[i].free_buf);
1.1.1.14  root     2174:     }
                   2175: }
                   2176: 
                   2177: static void multiwrite_cb(void *opaque, int ret)
                   2178: {
                   2179:     MultiwriteCB *mcb = opaque;
                   2180: 
1.1.1.19  root     2181:     trace_multiwrite_cb(mcb, ret);
                   2182: 
1.1.1.16  root     2183:     if (ret < 0 && !mcb->error) {
1.1.1.14  root     2184:         mcb->error = ret;
                   2185:     }
                   2186: 
                   2187:     mcb->num_requests--;
                   2188:     if (mcb->num_requests == 0) {
1.1.1.17  root     2189:         multiwrite_user_cb(mcb);
1.1.1.14  root     2190:         qemu_free(mcb);
                   2191:     }
                   2192: }
                   2193: 
                   2194: static int multiwrite_req_compare(const void *a, const void *b)
                   2195: {
1.1.1.17  root     2196:     const BlockRequest *req1 = a, *req2 = b;
                   2197: 
                   2198:     /*
                   2199:      * Note that we can't simply subtract req2->sector from req1->sector
                   2200:      * here as that could overflow the return value.
                   2201:      */
                   2202:     if (req1->sector > req2->sector) {
                   2203:         return 1;
                   2204:     } else if (req1->sector < req2->sector) {
                   2205:         return -1;
                   2206:     } else {
                   2207:         return 0;
                   2208:     }
1.1.1.14  root     2209: }
                   2210: 
                   2211: /*
                   2212:  * Takes a bunch of requests and tries to merge them. Returns the number of
                   2213:  * requests that remain after merging.
                   2214:  */
                   2215: static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
                   2216:     int num_reqs, MultiwriteCB *mcb)
                   2217: {
                   2218:     int i, outidx;
                   2219: 
                   2220:     // Sort requests by start sector
                   2221:     qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
                   2222: 
                   2223:     // Check if adjacent requests touch the same clusters. If so, combine them,
                   2224:     // filling up gaps with zero sectors.
                   2225:     outidx = 0;
                   2226:     for (i = 1; i < num_reqs; i++) {
                   2227:         int merge = 0;
                   2228:         int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
                   2229: 
                   2230:         // This handles the cases that are valid for all block drivers, namely
                   2231:         // exactly sequential writes and overlapping writes.
                   2232:         if (reqs[i].sector <= oldreq_last) {
                   2233:             merge = 1;
                   2234:         }
                   2235: 
                   2236:         // The block driver may decide that it makes sense to combine requests
                   2237:         // even if there is a gap of some sectors between them. In this case,
                   2238:         // the gap is filled with zeros (therefore only applicable for yet
                   2239:         // unused space in format like qcow2).
                   2240:         if (!merge && bs->drv->bdrv_merge_requests) {
                   2241:             merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
                   2242:         }
                   2243: 
1.1.1.16  root     2244:         if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
                   2245:             merge = 0;
                   2246:         }
                   2247: 
1.1.1.14  root     2248:         if (merge) {
                   2249:             size_t size;
                   2250:             QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
                   2251:             qemu_iovec_init(qiov,
                   2252:                 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
                   2253: 
                   2254:             // Add the first request to the merged one. If the requests are
                   2255:             // overlapping, drop the last sectors of the first request.
                   2256:             size = (reqs[i].sector - reqs[outidx].sector) << 9;
                   2257:             qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
                   2258: 
                   2259:             // We might need to add some zeros between the two requests
                   2260:             if (reqs[i].sector > oldreq_last) {
                   2261:                 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
                   2262:                 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
                   2263:                 memset(buf, 0, zero_bytes);
                   2264:                 qemu_iovec_add(qiov, buf, zero_bytes);
                   2265:                 mcb->callbacks[i].free_buf = buf;
                   2266:             }
                   2267: 
                   2268:             // Add the second request
                   2269:             qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
                   2270: 
1.1.1.17  root     2271:             reqs[outidx].nb_sectors = qiov->size >> 9;
1.1.1.14  root     2272:             reqs[outidx].qiov = qiov;
                   2273: 
                   2274:             mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
                   2275:         } else {
                   2276:             outidx++;
                   2277:             reqs[outidx].sector     = reqs[i].sector;
                   2278:             reqs[outidx].nb_sectors = reqs[i].nb_sectors;
                   2279:             reqs[outidx].qiov       = reqs[i].qiov;
                   2280:         }
                   2281:     }
                   2282: 
                   2283:     return outidx + 1;
                   2284: }
                   2285: 
                   2286: /*
                   2287:  * Submit multiple AIO write requests at once.
                   2288:  *
                   2289:  * On success, the function returns 0 and all requests in the reqs array have
                   2290:  * been submitted. In error case this function returns -1, and any of the
                   2291:  * requests may or may not be submitted yet. In particular, this means that the
                   2292:  * callback will be called for some of the requests, for others it won't. The
                   2293:  * caller must check the error field of the BlockRequest to wait for the right
                   2294:  * callbacks (if error != 0, no callback will be called).
                   2295:  *
                   2296:  * The implementation may modify the contents of the reqs array, e.g. to merge
                   2297:  * requests. However, the fields opaque and error are left unmodified as they
                   2298:  * are used to signal failure for a single request to the caller.
                   2299:  */
                   2300: int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
                   2301: {
                   2302:     BlockDriverAIOCB *acb;
                   2303:     MultiwriteCB *mcb;
                   2304:     int i;
                   2305: 
1.1.1.20! root     2306:     /* don't submit writes if we don't have a medium */
        !          2307:     if (bs->drv == NULL) {
        !          2308:         for (i = 0; i < num_reqs; i++) {
        !          2309:             reqs[i].error = -ENOMEDIUM;
        !          2310:         }
        !          2311:         return -1;
        !          2312:     }
        !          2313: 
1.1.1.14  root     2314:     if (num_reqs == 0) {
                   2315:         return 0;
                   2316:     }
                   2317: 
                   2318:     // Create MultiwriteCB structure
                   2319:     mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
                   2320:     mcb->num_requests = 0;
                   2321:     mcb->num_callbacks = num_reqs;
                   2322: 
                   2323:     for (i = 0; i < num_reqs; i++) {
                   2324:         mcb->callbacks[i].cb = reqs[i].cb;
                   2325:         mcb->callbacks[i].opaque = reqs[i].opaque;
                   2326:     }
                   2327: 
                   2328:     // Check for mergable requests
                   2329:     num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
                   2330: 
1.1.1.19  root     2331:     trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
                   2332: 
1.1.1.17  root     2333:     /*
                   2334:      * Run the aio requests. As soon as one request can't be submitted
                   2335:      * successfully, fail all requests that are not yet submitted (we must
                   2336:      * return failure for all requests anyway)
                   2337:      *
                   2338:      * num_requests cannot be set to the right value immediately: If
                   2339:      * bdrv_aio_writev fails for some request, num_requests would be too high
                   2340:      * and therefore multiwrite_cb() would never recognize the multiwrite
                   2341:      * request as completed. We also cannot use the loop variable i to set it
                   2342:      * when the first request fails because the callback may already have been
                   2343:      * called for previously submitted requests. Thus, num_requests must be
                   2344:      * incremented for each request that is submitted.
                   2345:      *
                   2346:      * The problem that callbacks may be called early also means that we need
                   2347:      * to take care that num_requests doesn't become 0 before all requests are
                   2348:      * submitted - multiwrite_cb() would consider the multiwrite request
                   2349:      * completed. A dummy request that is "completed" by a manual call to
                   2350:      * multiwrite_cb() takes care of this.
                   2351:      */
                   2352:     mcb->num_requests = 1;
                   2353: 
1.1.1.19  root     2354:     // Run the aio requests
1.1.1.14  root     2355:     for (i = 0; i < num_reqs; i++) {
1.1.1.17  root     2356:         mcb->num_requests++;
1.1.1.14  root     2357:         acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
                   2358:             reqs[i].nb_sectors, multiwrite_cb, mcb);
                   2359: 
                   2360:         if (acb == NULL) {
                   2361:             // We can only fail the whole thing if no request has been
                   2362:             // submitted yet. Otherwise we'll wait for the submitted AIOs to
                   2363:             // complete and report the error in the callback.
1.1.1.17  root     2364:             if (i == 0) {
1.1.1.19  root     2365:                 trace_bdrv_aio_multiwrite_earlyfail(mcb);
1.1.1.14  root     2366:                 goto fail;
                   2367:             } else {
1.1.1.19  root     2368:                 trace_bdrv_aio_multiwrite_latefail(mcb, i);
1.1.1.16  root     2369:                 multiwrite_cb(mcb, -EIO);
1.1.1.14  root     2370:                 break;
                   2371:             }
                   2372:         }
                   2373:     }
                   2374: 
1.1.1.17  root     2375:     /* Complete the dummy request */
                   2376:     multiwrite_cb(mcb, 0);
                   2377: 
1.1.1.14  root     2378:     return 0;
                   2379: 
                   2380: fail:
1.1.1.17  root     2381:     for (i = 0; i < mcb->num_callbacks; i++) {
                   2382:         reqs[i].error = -EIO;
                   2383:     }
                   2384:     qemu_free(mcb);
1.1.1.14  root     2385:     return -1;
                   2386: }
                   2387: 
                   2388: BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
                   2389:         BlockDriverCompletionFunc *cb, void *opaque)
                   2390: {
                   2391:     BlockDriver *drv = bs->drv;
                   2392: 
1.1.1.18  root     2393:     if (bs->open_flags & BDRV_O_NO_FLUSH) {
                   2394:         return bdrv_aio_noop_em(bs, cb, opaque);
                   2395:     }
                   2396: 
1.1.1.14  root     2397:     if (!drv)
                   2398:         return NULL;
                   2399:     return drv->bdrv_aio_flush(bs, cb, opaque);
                   2400: }
                   2401: 
1.1.1.5   root     2402: void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1.1.1.4   root     2403: {
1.1.1.10  root     2404:     acb->pool->cancel(acb);
1.1.1.5   root     2405: }
1.1.1.4   root     2406: 
                   2407: 
1.1.1.5   root     2408: /**************************************************************/
                   2409: /* async block device emulation */
1.1.1.4   root     2410: 
1.1.1.13  root     2411: typedef struct BlockDriverAIOCBSync {
                   2412:     BlockDriverAIOCB common;
                   2413:     QEMUBH *bh;
                   2414:     int ret;
                   2415:     /* vector translation state */
                   2416:     QEMUIOVector *qiov;
                   2417:     uint8_t *bounce;
                   2418:     int is_write;
                   2419: } BlockDriverAIOCBSync;
                   2420: 
                   2421: static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
                   2422: {
1.1.1.18  root     2423:     BlockDriverAIOCBSync *acb =
                   2424:         container_of(blockacb, BlockDriverAIOCBSync, common);
1.1.1.13  root     2425:     qemu_bh_delete(acb->bh);
                   2426:     acb->bh = NULL;
                   2427:     qemu_aio_release(acb);
                   2428: }
                   2429: 
                   2430: static AIOPool bdrv_em_aio_pool = {
                   2431:     .aiocb_size         = sizeof(BlockDriverAIOCBSync),
                   2432:     .cancel             = bdrv_aio_cancel_em,
                   2433: };
                   2434: 
1.1.1.5   root     2435: static void bdrv_aio_bh_cb(void *opaque)
1.1.1.4   root     2436: {
1.1.1.5   root     2437:     BlockDriverAIOCBSync *acb = opaque;
1.1.1.13  root     2438: 
                   2439:     if (!acb->is_write)
                   2440:         qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
                   2441:     qemu_vfree(acb->bounce);
1.1.1.5   root     2442:     acb->common.cb(acb->common.opaque, acb->ret);
1.1.1.13  root     2443:     qemu_bh_delete(acb->bh);
                   2444:     acb->bh = NULL;
1.1.1.5   root     2445:     qemu_aio_release(acb);
1.1.1.4   root     2446: }
                   2447: 
1.1.1.13  root     2448: static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
                   2449:                                             int64_t sector_num,
                   2450:                                             QEMUIOVector *qiov,
                   2451:                                             int nb_sectors,
                   2452:                                             BlockDriverCompletionFunc *cb,
                   2453:                                             void *opaque,
                   2454:                                             int is_write)
                   2455: 
1.1       root     2456: {
1.1.1.5   root     2457:     BlockDriverAIOCBSync *acb;
1.1       root     2458: 
1.1.1.13  root     2459:     acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
                   2460:     acb->is_write = is_write;
                   2461:     acb->qiov = qiov;
                   2462:     acb->bounce = qemu_blockalign(bs, qiov->size);
                   2463: 
1.1.1.5   root     2464:     if (!acb->bh)
                   2465:         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1.1.1.13  root     2466: 
                   2467:     if (is_write) {
                   2468:         qemu_iovec_to_buffer(acb->qiov, acb->bounce);
                   2469:         acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
                   2470:     } else {
                   2471:         acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
                   2472:     }
                   2473: 
1.1.1.5   root     2474:     qemu_bh_schedule(acb->bh);
1.1.1.13  root     2475: 
1.1.1.5   root     2476:     return &acb->common;
                   2477: }
1.1       root     2478: 
1.1.1.13  root     2479: static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
                   2480:         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1.1.1.5   root     2481:         BlockDriverCompletionFunc *cb, void *opaque)
                   2482: {
1.1.1.13  root     2483:     return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1.1.1.5   root     2484: }
                   2485: 
1.1.1.13  root     2486: static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
                   2487:         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
                   2488:         BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5   root     2489: {
1.1.1.13  root     2490:     return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1.1       root     2491: }
                   2492: 
1.1.1.14  root     2493: static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
                   2494:         BlockDriverCompletionFunc *cb, void *opaque)
                   2495: {
                   2496:     BlockDriverAIOCBSync *acb;
                   2497: 
                   2498:     acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
                   2499:     acb->is_write = 1; /* don't bounce in the completion hadler */
                   2500:     acb->qiov = NULL;
                   2501:     acb->bounce = NULL;
                   2502:     acb->ret = 0;
                   2503: 
                   2504:     if (!acb->bh)
                   2505:         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
                   2506: 
                   2507:     bdrv_flush(bs);
                   2508:     qemu_bh_schedule(acb->bh);
                   2509:     return &acb->common;
                   2510: }
                   2511: 
1.1.1.18  root     2512: static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
                   2513:         BlockDriverCompletionFunc *cb, void *opaque)
                   2514: {
                   2515:     BlockDriverAIOCBSync *acb;
                   2516: 
                   2517:     acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
                   2518:     acb->is_write = 1; /* don't bounce in the completion handler */
                   2519:     acb->qiov = NULL;
                   2520:     acb->bounce = NULL;
                   2521:     acb->ret = 0;
                   2522: 
                   2523:     if (!acb->bh) {
                   2524:         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
                   2525:     }
                   2526: 
                   2527:     qemu_bh_schedule(acb->bh);
                   2528:     return &acb->common;
                   2529: }
                   2530: 
1.1.1.5   root     2531: /**************************************************************/
                   2532: /* sync block device emulation */
                   2533: 
                   2534: static void bdrv_rw_em_cb(void *opaque, int ret)
1.1.1.4   root     2535: {
1.1.1.5   root     2536:     *(int *)opaque = ret;
1.1.1.4   root     2537: }
                   2538: 
1.1.1.5   root     2539: #define NOT_DONE 0x7fffffff
                   2540: 
1.1.1.6   root     2541: static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1.1.1.5   root     2542:                         uint8_t *buf, int nb_sectors)
                   2543: {
                   2544:     int async_ret;
                   2545:     BlockDriverAIOCB *acb;
1.1.1.13  root     2546:     struct iovec iov;
                   2547:     QEMUIOVector qiov;
1.1.1.5   root     2548: 
1.1.1.14  root     2549:     async_context_push();
                   2550: 
1.1.1.5   root     2551:     async_ret = NOT_DONE;
1.1.1.13  root     2552:     iov.iov_base = (void *)buf;
1.1.1.18  root     2553:     iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13  root     2554:     qemu_iovec_init_external(&qiov, &iov, 1);
                   2555:     acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
                   2556:         bdrv_rw_em_cb, &async_ret);
1.1.1.14  root     2557:     if (acb == NULL) {
                   2558:         async_ret = -1;
                   2559:         goto fail;
                   2560:     }
1.1.1.7   root     2561: 
1.1.1.5   root     2562:     while (async_ret == NOT_DONE) {
                   2563:         qemu_aio_wait();
                   2564:     }
1.1.1.7   root     2565: 
1.1.1.14  root     2566: 
                   2567: fail:
                   2568:     async_context_pop();
1.1.1.5   root     2569:     return async_ret;
                   2570: }
                   2571: 
                   2572: static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                   2573:                          const uint8_t *buf, int nb_sectors)
                   2574: {
                   2575:     int async_ret;
                   2576:     BlockDriverAIOCB *acb;
1.1.1.13  root     2577:     struct iovec iov;
                   2578:     QEMUIOVector qiov;
1.1.1.5   root     2579: 
1.1.1.14  root     2580:     async_context_push();
                   2581: 
1.1.1.5   root     2582:     async_ret = NOT_DONE;
1.1.1.13  root     2583:     iov.iov_base = (void *)buf;
1.1.1.18  root     2584:     iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
1.1.1.13  root     2585:     qemu_iovec_init_external(&qiov, &iov, 1);
                   2586:     acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
                   2587:         bdrv_rw_em_cb, &async_ret);
1.1.1.14  root     2588:     if (acb == NULL) {
                   2589:         async_ret = -1;
                   2590:         goto fail;
                   2591:     }
1.1.1.5   root     2592:     while (async_ret == NOT_DONE) {
                   2593:         qemu_aio_wait();
                   2594:     }
1.1.1.14  root     2595: 
                   2596: fail:
                   2597:     async_context_pop();
1.1.1.5   root     2598:     return async_ret;
                   2599: }
1.1       root     2600: 
                   2601: void bdrv_init(void)
                   2602: {
1.1.1.13  root     2603:     module_call_init(MODULE_INIT_BLOCK);
1.1.1.10  root     2604: }
                   2605: 
1.1.1.14  root     2606: void bdrv_init_with_whitelist(void)
                   2607: {
                   2608:     use_bdrv_whitelist = 1;
                   2609:     bdrv_init();
                   2610: }
                   2611: 
1.1.1.13  root     2612: void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                   2613:                    BlockDriverCompletionFunc *cb, void *opaque)
1.1.1.5   root     2614: {
                   2615:     BlockDriverAIOCB *acb;
                   2616: 
1.1.1.10  root     2617:     if (pool->free_aiocb) {
                   2618:         acb = pool->free_aiocb;
                   2619:         pool->free_aiocb = acb->next;
1.1.1.5   root     2620:     } else {
1.1.1.10  root     2621:         acb = qemu_mallocz(pool->aiocb_size);
                   2622:         acb->pool = pool;
1.1.1.5   root     2623:     }
                   2624:     acb->bs = bs;
                   2625:     acb->cb = cb;
                   2626:     acb->opaque = opaque;
                   2627:     return acb;
                   2628: }
                   2629: 
                   2630: void qemu_aio_release(void *p)
                   2631: {
1.1.1.10  root     2632:     BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
                   2633:     AIOPool *pool = acb->pool;
                   2634:     acb->next = pool->free_aiocb;
                   2635:     pool->free_aiocb = acb;
1.1.1.5   root     2636: }
                   2637: 
                   2638: /**************************************************************/
                   2639: /* removable device support */
                   2640: 
                   2641: /**
                   2642:  * Return TRUE if the media is present
                   2643:  */
                   2644: int bdrv_is_inserted(BlockDriverState *bs)
                   2645: {
                   2646:     BlockDriver *drv = bs->drv;
                   2647:     int ret;
                   2648:     if (!drv)
                   2649:         return 0;
                   2650:     if (!drv->bdrv_is_inserted)
1.1.1.18  root     2651:         return !bs->tray_open;
1.1.1.5   root     2652:     ret = drv->bdrv_is_inserted(bs);
                   2653:     return ret;
                   2654: }
                   2655: 
                   2656: /**
                   2657:  * Return TRUE if the media changed since the last call to this
1.1.1.6   root     2658:  * function. It is currently only used for floppy disks
1.1.1.5   root     2659:  */
                   2660: int bdrv_media_changed(BlockDriverState *bs)
                   2661: {
                   2662:     BlockDriver *drv = bs->drv;
                   2663:     int ret;
                   2664: 
                   2665:     if (!drv || !drv->bdrv_media_changed)
                   2666:         ret = -ENOTSUP;
                   2667:     else
                   2668:         ret = drv->bdrv_media_changed(bs);
                   2669:     if (ret == -ENOTSUP)
                   2670:         ret = bs->media_changed;
                   2671:     bs->media_changed = 0;
                   2672:     return ret;
                   2673: }
                   2674: 
                   2675: /**
                   2676:  * If eject_flag is TRUE, eject the media. Otherwise, close the tray
                   2677:  */
1.1.1.13  root     2678: int bdrv_eject(BlockDriverState *bs, int eject_flag)
1.1.1.5   root     2679: {
                   2680:     BlockDriver *drv = bs->drv;
                   2681:     int ret;
                   2682: 
1.1.1.13  root     2683:     if (bs->locked) {
                   2684:         return -EBUSY;
                   2685:     }
                   2686: 
1.1.1.5   root     2687:     if (!drv || !drv->bdrv_eject) {
                   2688:         ret = -ENOTSUP;
                   2689:     } else {
                   2690:         ret = drv->bdrv_eject(bs, eject_flag);
                   2691:     }
                   2692:     if (ret == -ENOTSUP) {
1.1.1.13  root     2693:         ret = 0;
1.1.1.5   root     2694:     }
1.1.1.18  root     2695:     if (ret >= 0) {
                   2696:         bs->tray_open = eject_flag;
                   2697:     }
1.1.1.13  root     2698: 
                   2699:     return ret;
1.1.1.5   root     2700: }
                   2701: 
                   2702: int bdrv_is_locked(BlockDriverState *bs)
                   2703: {
                   2704:     return bs->locked;
                   2705: }
                   2706: 
                   2707: /**
                   2708:  * Lock or unlock the media (if it is locked, the user won't be able
                   2709:  * to eject it manually).
                   2710:  */
                   2711: void bdrv_set_locked(BlockDriverState *bs, int locked)
                   2712: {
                   2713:     BlockDriver *drv = bs->drv;
                   2714: 
                   2715:     bs->locked = locked;
                   2716:     if (drv && drv->bdrv_set_locked) {
                   2717:         drv->bdrv_set_locked(bs, locked);
                   2718:     }
1.1       root     2719: }
1.1.1.6   root     2720: 
                   2721: /* needed for generic scsi interface */
                   2722: 
                   2723: int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
                   2724: {
                   2725:     BlockDriver *drv = bs->drv;
                   2726: 
                   2727:     if (drv && drv->bdrv_ioctl)
                   2728:         return drv->bdrv_ioctl(bs, req, buf);
                   2729:     return -ENOTSUP;
                   2730: }
1.1.1.13  root     2731: 
                   2732: BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
                   2733:         unsigned long int req, void *buf,
                   2734:         BlockDriverCompletionFunc *cb, void *opaque)
                   2735: {
                   2736:     BlockDriver *drv = bs->drv;
                   2737: 
                   2738:     if (drv && drv->bdrv_aio_ioctl)
                   2739:         return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
                   2740:     return NULL;
                   2741: }
                   2742: 
1.1.1.14  root     2743: 
                   2744: 
1.1.1.13  root     2745: void *qemu_blockalign(BlockDriverState *bs, size_t size)
                   2746: {
                   2747:     return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
                   2748: }
1.1.1.14  root     2749: 
                   2750: void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
                   2751: {
                   2752:     int64_t bitmap_size;
                   2753: 
1.1.1.18  root     2754:     bs->dirty_count = 0;
1.1.1.14  root     2755:     if (enable) {
                   2756:         if (!bs->dirty_bitmap) {
                   2757:             bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
                   2758:                     BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
                   2759:             bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
                   2760: 
                   2761:             bs->dirty_bitmap = qemu_mallocz(bitmap_size);
                   2762:         }
                   2763:     } else {
                   2764:         if (bs->dirty_bitmap) {
                   2765:             qemu_free(bs->dirty_bitmap);
                   2766:             bs->dirty_bitmap = NULL;
                   2767:         }
                   2768:     }
                   2769: }
                   2770: 
                   2771: int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
                   2772: {
                   2773:     int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
                   2774: 
                   2775:     if (bs->dirty_bitmap &&
                   2776:         (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
1.1.1.19  root     2777:         return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
                   2778:             (1UL << (chunk % (sizeof(unsigned long) * 8))));
1.1.1.14  root     2779:     } else {
                   2780:         return 0;
                   2781:     }
                   2782: }
                   2783: 
                   2784: void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
                   2785:                       int nr_sectors)
                   2786: {
                   2787:     set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
                   2788: }
1.1.1.18  root     2789: 
                   2790: int64_t bdrv_get_dirty_count(BlockDriverState *bs)
                   2791: {
                   2792:     return bs->dirty_count;
                   2793: }
1.1.1.19  root     2794: 
                   2795: void bdrv_set_in_use(BlockDriverState *bs, int in_use)
                   2796: {
                   2797:     assert(bs->in_use != in_use);
                   2798:     bs->in_use = in_use;
                   2799: }
                   2800: 
                   2801: int bdrv_in_use(BlockDriverState *bs)
                   2802: {
                   2803:     return bs->in_use;
                   2804: }
                   2805: 
                   2806: int bdrv_img_create(const char *filename, const char *fmt,
                   2807:                     const char *base_filename, const char *base_fmt,
                   2808:                     char *options, uint64_t img_size, int flags)
                   2809: {
                   2810:     QEMUOptionParameter *param = NULL, *create_options = NULL;
                   2811:     QEMUOptionParameter *backing_fmt, *backing_file;
                   2812:     BlockDriverState *bs = NULL;
                   2813:     BlockDriver *drv, *proto_drv;
                   2814:     BlockDriver *backing_drv = NULL;
                   2815:     int ret = 0;
                   2816: 
                   2817:     /* Find driver and parse its options */
                   2818:     drv = bdrv_find_format(fmt);
                   2819:     if (!drv) {
                   2820:         error_report("Unknown file format '%s'", fmt);
                   2821:         ret = -EINVAL;
                   2822:         goto out;
                   2823:     }
                   2824: 
                   2825:     proto_drv = bdrv_find_protocol(filename);
                   2826:     if (!proto_drv) {
                   2827:         error_report("Unknown protocol '%s'", filename);
                   2828:         ret = -EINVAL;
                   2829:         goto out;
                   2830:     }
                   2831: 
                   2832:     create_options = append_option_parameters(create_options,
                   2833:                                               drv->create_options);
                   2834:     create_options = append_option_parameters(create_options,
                   2835:                                               proto_drv->create_options);
                   2836: 
                   2837:     /* Create parameter list with default values */
                   2838:     param = parse_option_parameters("", create_options, param);
                   2839: 
                   2840:     set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
                   2841: 
                   2842:     /* Parse -o options */
                   2843:     if (options) {
                   2844:         param = parse_option_parameters(options, create_options, param);
                   2845:         if (param == NULL) {
                   2846:             error_report("Invalid options for file format '%s'.", fmt);
                   2847:             ret = -EINVAL;
                   2848:             goto out;
                   2849:         }
                   2850:     }
                   2851: 
                   2852:     if (base_filename) {
                   2853:         if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
                   2854:                                  base_filename)) {
                   2855:             error_report("Backing file not supported for file format '%s'",
                   2856:                          fmt);
                   2857:             ret = -EINVAL;
                   2858:             goto out;
                   2859:         }
                   2860:     }
                   2861: 
                   2862:     if (base_fmt) {
                   2863:         if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
                   2864:             error_report("Backing file format not supported for file "
                   2865:                          "format '%s'", fmt);
                   2866:             ret = -EINVAL;
                   2867:             goto out;
                   2868:         }
                   2869:     }
                   2870: 
                   2871:     backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
                   2872:     if (backing_file && backing_file->value.s) {
                   2873:         if (!strcmp(filename, backing_file->value.s)) {
                   2874:             error_report("Error: Trying to create an image with the "
                   2875:                          "same filename as the backing file");
                   2876:             ret = -EINVAL;
                   2877:             goto out;
                   2878:         }
                   2879:     }
                   2880: 
                   2881:     backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
                   2882:     if (backing_fmt && backing_fmt->value.s) {
                   2883:         backing_drv = bdrv_find_format(backing_fmt->value.s);
                   2884:         if (!backing_drv) {
                   2885:             error_report("Unknown backing file format '%s'",
                   2886:                          backing_fmt->value.s);
                   2887:             ret = -EINVAL;
                   2888:             goto out;
                   2889:         }
                   2890:     }
                   2891: 
                   2892:     // The size for the image must always be specified, with one exception:
                   2893:     // If we are using a backing file, we can obtain the size from there
                   2894:     if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
                   2895:         if (backing_file && backing_file->value.s) {
                   2896:             uint64_t size;
                   2897:             char buf[32];
                   2898: 
                   2899:             bs = bdrv_new("");
                   2900: 
                   2901:             ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv);
                   2902:             if (ret < 0) {
                   2903:                 error_report("Could not open '%s'", backing_file->value.s);
                   2904:                 goto out;
                   2905:             }
                   2906:             bdrv_get_geometry(bs, &size);
                   2907:             size *= 512;
                   2908: 
                   2909:             snprintf(buf, sizeof(buf), "%" PRId64, size);
                   2910:             set_option_parameter(param, BLOCK_OPT_SIZE, buf);
                   2911:         } else {
                   2912:             error_report("Image creation needs a size parameter");
                   2913:             ret = -EINVAL;
                   2914:             goto out;
                   2915:         }
                   2916:     }
                   2917: 
                   2918:     printf("Formatting '%s', fmt=%s ", filename, fmt);
                   2919:     print_option_parameters(param);
                   2920:     puts("");
                   2921: 
                   2922:     ret = bdrv_create(drv, filename, param);
                   2923: 
                   2924:     if (ret < 0) {
                   2925:         if (ret == -ENOTSUP) {
                   2926:             error_report("Formatting or formatting option not supported for "
                   2927:                          "file format '%s'", fmt);
                   2928:         } else if (ret == -EFBIG) {
                   2929:             error_report("The image size is too large for file format '%s'",
                   2930:                          fmt);
                   2931:         } else {
                   2932:             error_report("%s: error while creating %s: %s", filename, fmt,
                   2933:                          strerror(-ret));
                   2934:         }
                   2935:     }
                   2936: 
                   2937: out:
                   2938:     free_option_parameters(create_options);
                   2939:     free_option_parameters(param);
                   2940: 
                   2941:     if (bs) {
                   2942:         bdrv_delete(bs);
                   2943:     }
                   2944: 
                   2945:     return ret;
                   2946: }

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