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author | The Android Open Source Project <initial-contribution@android.com> | 2009-02-10 15:43:59 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-02-10 15:43:59 -0800 |
commit | c27f813900a3c114562efbb8df1065e94766fc48 (patch) | |
tree | d95919283707dcab61009e27007374a745c9541e /block.c | |
parent | 0852ad57fa372f9b2854e4df685eaba8d8ef6790 (diff) | |
download | external_qemu-c27f813900a3c114562efbb8df1065e94766fc48.zip external_qemu-c27f813900a3c114562efbb8df1065e94766fc48.tar.gz external_qemu-c27f813900a3c114562efbb8df1065e94766fc48.tar.bz2 |
auto import from //branches/cupcake/...@130745
Diffstat (limited to 'block.c')
-rw-r--r-- | block.c | 1292 |
1 files changed, 937 insertions, 355 deletions
@@ -21,7 +21,8 @@ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ -#include "vl.h" +#include "qemu-common.h" +#include "console.h" #include "block_int.h" #ifdef _BSD @@ -32,85 +33,107 @@ #include <sys/disk.h> #endif -#ifdef CONFIG_COCOA -#include <paths.h> -#include <sys/param.h> -#include <IOKit/IOKitLib.h> -#include <IOKit/IOBSD.h> -#include <IOKit/storage/IOMediaBSDClient.h> -#include <IOKit/storage/IOMedia.h> -#include <IOKit/storage/IOCDMedia.h> -//#include <IOKit/storage/IOCDTypes.h> -#include <CoreFoundation/CoreFoundation.h> -#endif +#define SECTOR_BITS 9 +#define SECTOR_SIZE (1 << SECTOR_BITS) -#ifdef __sun__ -#include <sys/dkio.h> -#endif +typedef struct BlockDriverAIOCBSync { + BlockDriverAIOCB common; + QEMUBH *bh; + int ret; +} BlockDriverAIOCBSync; + +static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, + int64_t sector_num, uint8_t *buf, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque); +static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, + int64_t sector_num, const uint8_t *buf, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque); +static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); +static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, + uint8_t *buf, int nb_sectors); +static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors); -static BlockDriverState *bdrv_first; static BlockDriver *first_drv; -#ifdef CONFIG_COCOA -static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ); -static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ); - -kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ) +int path_is_absolute(const char *path) { - kern_return_t kernResult; - mach_port_t masterPort; - CFMutableDictionaryRef classesToMatch; - - kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort ); - if ( KERN_SUCCESS != kernResult ) { - printf( "IOMasterPort returned %d\n", kernResult ); - } - - classesToMatch = IOServiceMatching( kIOCDMediaClass ); - if ( classesToMatch == NULL ) { - printf( "IOServiceMatching returned a NULL dictionary.\n" ); - } else { - CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue ); - } - kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator ); - if ( KERN_SUCCESS != kernResult ) - { - printf( "IOServiceGetMatchingServices returned %d\n", kernResult ); - } - - return kernResult; + const char *p; +#ifdef _WIN32 + /* specific case for names like: "\\.\d:" */ + if (*path == '/' || *path == '\\') + return 1; +#endif + p = strchr(path, ':'); + if (p) + p++; + else + p = path; +#ifdef _WIN32 + return (*p == '/' || *p == '\\'); +#else + return (*p == '/'); +#endif } -kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ) +/* if filename is absolute, just copy it to dest. Otherwise, build a + path to it by considering it is relative to base_path. URL are + supported. */ +void path_combine(char *dest, int dest_size, + const char *base_path, + const char *filename) { - io_object_t nextMedia; - kern_return_t kernResult = KERN_FAILURE; - *bsdPath = '\0'; - nextMedia = IOIteratorNext( mediaIterator ); - if ( nextMedia ) - { - CFTypeRef bsdPathAsCFString; - bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 ); - if ( bsdPathAsCFString ) { - size_t devPathLength; - strcpy( bsdPath, _PATH_DEV ); - strcat( bsdPath, "r" ); - devPathLength = strlen( bsdPath ); - if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) { - kernResult = KERN_SUCCESS; - } - CFRelease( bsdPathAsCFString ); + const char *p, *p1; + int len; + + if (dest_size <= 0) + return; + if (path_is_absolute(filename)) { + pstrcpy(dest, dest_size, filename); + } else { + p = strchr(base_path, ':'); + if (p) + p++; + else + p = base_path; + p1 = strrchr(base_path, '/'); +#ifdef _WIN32 + { + const char *p2; + p2 = strrchr(base_path, '\\'); + if (!p1 || p2 > p1) + p1 = p2; } - IOObjectRelease( nextMedia ); +#endif + if (p1) + p1++; + else + p1 = base_path; + if (p1 > p) + p = p1; + len = p - base_path; + if (len > dest_size - 1) + len = dest_size - 1; + memcpy(dest, base_path, len); + dest[len] = '\0'; + pstrcat(dest, dest_size, filename); } - - return kernResult; } -#endif -void bdrv_register(BlockDriver *bdrv) +static void bdrv_register(BlockDriver *bdrv) { + if (!bdrv->bdrv_aio_read) { + /* add AIO emulation layer */ + bdrv->bdrv_aio_read = bdrv_aio_read_em; + bdrv->bdrv_aio_write = bdrv_aio_write_em; + bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; + bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); + } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { + /* add synchronous IO emulation layer */ + bdrv->bdrv_read = bdrv_read_em; + bdrv->bdrv_write = bdrv_write_em; + } bdrv->next = first_drv; first_drv = bdrv; } @@ -156,123 +179,164 @@ int bdrv_create(BlockDriver *drv, #ifdef _WIN32 void get_tmp_filename(char *filename, int size) { - char* p = strrchr(filename, '/'); - - if (p == NULL) - return; + char temp_dir[MAX_PATH]; - /* XXX: find a better function */ - tmpnam(p); - *p = '/'; + GetTempPath(MAX_PATH, temp_dir); + GetTempFileName(temp_dir, "qem", 0, filename); } #else void get_tmp_filename(char *filename, int size) { int fd; + const char *tmpdir; /* XXX: race condition possible */ - pstrcpy(filename, size, "/tmp/vl.XXXXXX"); + tmpdir = getenv("TMPDIR"); + if (!tmpdir) + tmpdir = "/tmp"; + snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); fd = mkstemp(filename); close(fd); } #endif +#ifdef _WIN32 +static int is_windows_drive_prefix(const char *filename) +{ + return (((filename[0] >= 'a' && filename[0] <= 'z') || + (filename[0] >= 'A' && filename[0] <= 'Z')) && + filename[1] == ':'); +} + +static int is_windows_drive(const char *filename) +{ + if (is_windows_drive_prefix(filename) && + filename[2] == '\0') + return 1; + if (strstart(filename, "\\\\.\\", NULL) || + strstart(filename, "//./", NULL)) + return 1; + return 0; +} +#endif + +static BlockDriver *find_protocol(const char *filename) +{ + BlockDriver *drv1; + char protocol[128]; + int len; + const char *p; + +#ifdef _WIN32 + if (is_windows_drive(filename) || + is_windows_drive_prefix(filename)) + return &bdrv_raw; +#endif + p = strchr(filename, ':'); + if (!p) + return &bdrv_raw; + len = p - filename; + if (len > sizeof(protocol) - 1) + len = sizeof(protocol) - 1; + memcpy(protocol, filename, len); + protocol[len] = '\0'; + for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { + if (drv1->protocol_name && + !strcmp(drv1->protocol_name, protocol)) + return drv1; + } + return NULL; +} + /* XXX: force raw format if block or character device ? It would simplify the BSD case */ static BlockDriver *find_image_format(const char *filename) { - int fd, ret, score, score_max; + int ret, score, score_max; BlockDriver *drv1, *drv; - uint8_t *buf; - size_t bufsize = 1024; + uint8_t buf[2048]; + BlockDriverState *bs; - fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); - if (fd < 0) { - buf = NULL; - ret = 0; - } else { -#ifdef DIOCGSECTORSIZE - { - unsigned int sectorsize = 512; - if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) && - sectorsize > bufsize) - bufsize = sectorsize; - } -#endif -#ifdef CONFIG_COCOA - u_int32_t blockSize = 512; - if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) { - bufsize = blockSize; + /* detect host devices. By convention, /dev/cdrom[N] is always + recognized as a host CDROM */ + if (strstart(filename, "/dev/cdrom", NULL)) + return &bdrv_host_device; +#ifdef _WIN32 + if (is_windows_drive(filename)) + return &bdrv_host_device; +#else + { + struct stat st; + if (stat(filename, &st) >= 0 && + (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { + return &bdrv_host_device; } + } #endif - buf = qemu_malloc(bufsize); - if (!buf) - return NULL; - ret = read(fd, buf, bufsize); - if (ret < 0) { - close(fd); - qemu_free(buf); - return NULL; - } - close(fd); + + drv = find_protocol(filename); + /* no need to test disk image formats for vvfat */ + if (drv == &bdrv_vvfat) + return drv; + + ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); + if (ret < 0) + return NULL; + ret = bdrv_pread(bs, 0, buf, sizeof(buf)); + bdrv_delete(bs); + if (ret < 0) { + return NULL; } - drv = NULL; score_max = 0; for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { - score = drv1->bdrv_probe(buf, ret, filename); - if (score > score_max) { - score_max = score; - drv = drv1; + if (drv1->bdrv_probe) { + score = drv1->bdrv_probe(buf, ret, filename); + if (score > score_max) { + score_max = score; + drv = drv1; + } } } - qemu_free(buf); return drv; } -int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot) +int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) { -#ifdef CONFIG_COCOA - if ( strncmp( filename, "/dev/cdrom", 10 ) == 0 ) { - kern_return_t kernResult; - io_iterator_t mediaIterator; - char bsdPath[ MAXPATHLEN ]; - int fd; - - kernResult = FindEjectableCDMedia( &mediaIterator ); - kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) ); - - if ( bsdPath[ 0 ] != '\0' ) { - strcat(bsdPath,"s0"); - /* some CDs don't have a partition 0 */ - fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE); - if (fd < 0) { - bsdPath[strlen(bsdPath)-1] = '1'; - } else { - close(fd); - } - filename = bsdPath; - } + BlockDriverState *bs; + int ret; - if ( mediaIterator ) - IOObjectRelease( mediaIterator ); + bs = bdrv_new(""); + if (!bs) + return -ENOMEM; + ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); + if (ret < 0) { + bdrv_delete(bs); + return ret; } -#endif - return bdrv_open2(bs, filename, snapshot, NULL); + *pbs = bs; + return 0; +} + +int bdrv_open(BlockDriverState *bs, const char *filename, int flags) +{ + return bdrv_open2(bs, filename, flags, NULL); } -int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot, +int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, BlockDriver *drv) { - int ret; - char tmp_filename[1024]; + int ret, open_flags; + char tmp_filename[PATH_MAX]; + char backing_filename[PATH_MAX]; bs->read_only = 0; bs->is_temporary = 0; bs->encrypted = 0; - if (snapshot) { + if (flags & BDRV_O_SNAPSHOT) { BlockDriverState *bs1; int64_t total_size; + int is_protocol = 0; /* if snapshot, we create a temporary backing file and open it instead of opening 'filename' directly */ @@ -280,19 +344,30 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot, /* if there is a backing file, use it */ bs1 = bdrv_new(""); if (!bs1) { - return -1; + return -ENOMEM; } if (bdrv_open(bs1, filename, 0) < 0) { bdrv_delete(bs1); return -1; } - total_size = bs1->total_sectors; + total_size = bdrv_getlength(bs1) >> SECTOR_BITS; + + if (bs1->drv && bs1->drv->protocol_name) + is_protocol = 1; + bdrv_delete(bs1); get_tmp_filename(tmp_filename, sizeof(tmp_filename)); - /* XXX: use cow for linux as it is more efficient ? */ - if (bdrv_create(&bdrv_qcow, tmp_filename, - total_size, filename, 0) < 0) { + + /* Real path is meaningless for protocols */ + if (is_protocol) + snprintf(backing_filename, sizeof(backing_filename), + "%s", filename); + else + realpath(filename, backing_filename); + + if (bdrv_create(&bdrv_qcow2, tmp_filename, + total_size, backing_filename, 0) < 0) { return -1; } filename = tmp_filename; @@ -300,41 +375,62 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot, } pstrcpy(bs->filename, sizeof(bs->filename), filename); - if (!drv) { - drv = find_image_format(filename); + if (flags & BDRV_O_FILE) { + drv = find_protocol(filename); if (!drv) - return -1; + return -ENOENT; + } else { + if (!drv) { + drv = find_image_format(filename); + if (!drv) + return -1; + } } bs->drv = drv; bs->opaque = qemu_mallocz(drv->instance_size); if (bs->opaque == NULL && drv->instance_size > 0) return -1; - - ret = drv->bdrv_open(bs, filename); + /* Note: for compatibility, we open disk image files as RDWR, and + RDONLY as fallback */ + if (!(flags & BDRV_O_FILE)) + open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT); + else + open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); + ret = drv->bdrv_open(bs, filename, open_flags); + if (ret == -EACCES && !(flags & BDRV_O_FILE)) { + ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); + bs->read_only = 1; + } if (ret < 0) { qemu_free(bs->opaque); - return -1; + bs->opaque = NULL; + bs->drv = NULL; + return ret; + } + if (drv->bdrv_getlength) { + bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; } #ifndef _WIN32 if (bs->is_temporary) { unlink(filename); } #endif - if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) { + if (bs->backing_file[0] != '\0') { /* if there is a backing file, use it */ bs->backing_hd = bdrv_new(""); if (!bs->backing_hd) { fail: bdrv_close(bs); - return -1; + return -ENOMEM; } - if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0) + path_combine(backing_filename, sizeof(backing_filename), + filename, bs->backing_file); + if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) goto fail; } - bs->inserted = 1; - /* call the change callback */ + bs->media_changed = 1; if (bs->change_cb) bs->change_cb(bs->change_opaque); @@ -343,7 +439,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot, void bdrv_close(BlockDriverState *bs) { - if (bs->inserted) { + if (bs->drv) { if (bs->backing_hd) bdrv_delete(bs->backing_hd); bs->drv->bdrv_close(bs); @@ -355,9 +451,9 @@ void bdrv_close(BlockDriverState *bs) #endif bs->opaque = NULL; bs->drv = NULL; - bs->inserted = 0; /* call the change callback */ + bs->media_changed = 1; if (bs->change_cb) bs->change_cb(bs->change_opaque); } @@ -365,7 +461,14 @@ void bdrv_close(BlockDriverState *bs) void bdrv_delete(BlockDriverState *bs) { - /* XXX: remove the driver list */ + BlockDriverState **pbs; + + pbs = &bdrv_first; + while (*pbs != bs && *pbs != NULL) + pbs = &(*pbs)->next; + if (*pbs == bs) + *pbs = bs->next; + bdrv_close(bs); qemu_free(bs); } @@ -373,12 +476,13 @@ void bdrv_delete(BlockDriverState *bs) /* commit COW file into the raw image */ int bdrv_commit(BlockDriverState *bs) { - int64_t i; + BlockDriver *drv = bs->drv; + int64_t i, total_sectors; int n, j; unsigned char sector[512]; - if (!bs->inserted) - return -ENOENT; + if (!drv) + return -ENOMEDIUM; if (bs->read_only) { return -EACCES; @@ -388,8 +492,9 @@ int bdrv_commit(BlockDriverState *bs) return -ENOTSUP; } - for (i = 0; i < bs->total_sectors;) { - if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) { + total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; + for (i = 0; i < total_sectors;) { + if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { for(j = 0; j < n; j++) { if (bdrv_read(bs, i, sector, 1) != 0) { return -EIO; @@ -405,68 +510,242 @@ int bdrv_commit(BlockDriverState *bs) } } - if (bs->drv->bdrv_make_empty) - return bs->drv->bdrv_make_empty(bs); + if (drv->bdrv_make_empty) + return drv->bdrv_make_empty(bs); return 0; } -/* return -1 if error */ +/* return < 0 if error. See bdrv_write() for the return codes */ int bdrv_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors) { - int ret, n; BlockDriver *drv = bs->drv; - if (!bs->inserted) - return -1; + if (!drv) + return -ENOMEDIUM; - while (nb_sectors > 0) { - if (sector_num == 0 && bs->boot_sector_enabled) { + if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { memcpy(buf, bs->boot_sector_data, 512); - n = 1; - } else if (bs->backing_hd) { - if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) { - ret = drv->bdrv_read(bs, sector_num, buf, n); - if (ret < 0) - return -1; - } else { - /* read from the base image */ - ret = bdrv_read(bs->backing_hd, sector_num, buf, n); - if (ret < 0) - return -1; - } - } else { - ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors); - if (ret < 0) - return -1; - /* no need to loop */ - break; - } - nb_sectors -= n; - sector_num += n; - buf += n * 512; + sector_num++; + nb_sectors--; + buf += 512; + if (nb_sectors == 0) + return 0; + } + if (drv->bdrv_pread) { + int ret, len; + len = nb_sectors * 512; + ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); + if (ret < 0) + return ret; + else if (ret != len) + return -EINVAL; + else { + bs->rd_bytes += (unsigned) len; + bs->rd_ops ++; + return 0; + } + } else { + return drv->bdrv_read(bs, sector_num, buf, nb_sectors); } - return 0; } -/* return -1 if error */ +/* Return < 0 if error. Important errors are: + -EIO generic I/O error (may happen for all errors) + -ENOMEDIUM No media inserted. + -EINVAL Invalid sector number or nb_sectors + -EACCES Trying to write a read-only device +*/ int bdrv_write(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors) { - if (!bs->inserted) - return -1; + BlockDriver *drv = bs->drv; + if (!bs->drv) + return -ENOMEDIUM; if (bs->read_only) - return -1; + return -EACCES; if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { memcpy(bs->boot_sector_data, buf, 512); } - return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors); + if (drv->bdrv_pwrite) { + int ret, len; + len = nb_sectors * 512; + ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); + if (ret < 0) + return ret; + else if (ret != len) + return -EIO; + else { + bs->wr_bytes += (unsigned) len; + bs->wr_ops ++; + return 0; + } + } else { + return drv->bdrv_write(bs, sector_num, buf, nb_sectors); + } +} + +static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, + uint8_t *buf, int count1) +{ + uint8_t tmp_buf[SECTOR_SIZE]; + int len, nb_sectors, count; + int64_t sector_num; + + count = count1; + /* first read to align to sector start */ + len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); + if (len > count) + len = count; + sector_num = offset >> SECTOR_BITS; + if (len > 0) { + if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) + return -EIO; + memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); + count -= len; + if (count == 0) + return count1; + sector_num++; + buf += len; + } + + /* read the sectors "in place" */ + nb_sectors = count >> SECTOR_BITS; + if (nb_sectors > 0) { + if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) + return -EIO; + sector_num += nb_sectors; + len = nb_sectors << SECTOR_BITS; + buf += len; + count -= len; + } + + /* add data from the last sector */ + if (count > 0) { + if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) + return -EIO; + memcpy(buf, tmp_buf, count); + } + return count1; +} + +static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, + const uint8_t *buf, int count1) +{ + uint8_t tmp_buf[SECTOR_SIZE]; + int len, nb_sectors, count; + int64_t sector_num; + + count = count1; + /* first write to align to sector start */ + len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); + if (len > count) + len = count; + sector_num = offset >> SECTOR_BITS; + if (len > 0) { + if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) + return -EIO; + memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); + if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) + return -EIO; + count -= len; + if (count == 0) + return count1; + sector_num++; + buf += len; + } + + /* write the sectors "in place" */ + nb_sectors = count >> SECTOR_BITS; + if (nb_sectors > 0) { + if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) + return -EIO; + sector_num += nb_sectors; + len = nb_sectors << SECTOR_BITS; + buf += len; + count -= len; + } + + /* add data from the last sector */ + if (count > 0) { + if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) + return -EIO; + memcpy(tmp_buf, buf, count); + if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) + return -EIO; + } + return count1; } -void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) +/** + * Read with byte offsets (needed only for file protocols) + */ +int bdrv_pread(BlockDriverState *bs, int64_t offset, + void *buf1, int count1) +{ + BlockDriver *drv = bs->drv; + + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_pread) + return bdrv_pread_em(bs, offset, buf1, count1); + return drv->bdrv_pread(bs, offset, buf1, count1); +} + +/** + * Write with byte offsets (needed only for file protocols) + */ +int bdrv_pwrite(BlockDriverState *bs, int64_t offset, + const void *buf1, int count1) +{ + BlockDriver *drv = bs->drv; + + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_pwrite) + return bdrv_pwrite_em(bs, offset, buf1, count1); + return drv->bdrv_pwrite(bs, offset, buf1, count1); +} + +/** + * Truncate file to 'offset' bytes (needed only for file protocols) + */ +int bdrv_truncate(BlockDriverState *bs, int64_t offset) +{ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_truncate) + return -ENOTSUP; + return drv->bdrv_truncate(bs, offset); +} + +/** + * Length of a file in bytes. Return < 0 if error or unknown. + */ +int64_t bdrv_getlength(BlockDriverState *bs) +{ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_getlength) { + /* legacy mode */ + return bs->total_sectors * SECTOR_SIZE; + } + return drv->bdrv_getlength(bs); +} + +/* return 0 as number of sectors if no device present or error */ +void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) { - *nb_sectors_ptr = bs->total_sectors; + int64_t length; + length = bdrv_getlength(bs); + if (length < 0) + length = 0; + else + length = length >> SECTOR_BITS; + *nb_sectors_ptr = length; } /* force a given boot sector. */ @@ -527,21 +806,12 @@ int bdrv_is_read_only(BlockDriverState *bs) return bs->read_only; } -int bdrv_is_inserted(BlockDriverState *bs) -{ - return bs->inserted; -} - -int bdrv_is_locked(BlockDriverState *bs) -{ - return bs->locked; -} - -void bdrv_set_locked(BlockDriverState *bs, int locked) +int bdrv_is_sg(BlockDriverState *bs) { - bs->locked = locked; + return bs->sg; } +/* XXX: no longer used */ void bdrv_set_change_cb(BlockDriverState *bs, void (*change_cb)(void *opaque), void *opaque) { @@ -573,7 +843,7 @@ int bdrv_set_key(BlockDriverState *bs, const char *key) void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) { - if (!bs->inserted || !bs->drv) { + if (!bs->drv) { buf[0] = '\0'; } else { pstrcpy(buf, buf_size, bs->drv->format_name); @@ -623,6 +893,33 @@ void bdrv_flush(BlockDriverState *bs) bdrv_flush(bs->backing_hd); } +/* + * Returns true iff the specified sector is present in the disk image. Drivers + * not implementing the functionality are assumed to not support backing files, + * hence all their sectors are reported as allocated. + * + * 'pnum' is set to the number of sectors (including and immediately following + * the specified sector) that are known to be in the same + * allocated/unallocated state. + * + * 'nb_sectors' is the max value 'pnum' should be set to. + */ +int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, + int *pnum) +{ + int64_t n; + if (!bs->drv->bdrv_is_allocated) { + if (sector_num >= bs->total_sectors) { + *pnum = 0; + return 0; + } + n = bs->total_sectors - sector_num; + *pnum = (n < nb_sectors) ? (n) : (nb_sectors); + return 1; + } + return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); +} + void bdrv_info(void) { BlockDriverState *bs; @@ -645,10 +942,13 @@ void bdrv_info(void) if (bs->removable) { term_printf(" locked=%d", bs->locked); } - if (bs->inserted) { - term_printf(" file=%s", bs->filename); - if (bs->backing_file[0] != '\0') - term_printf(" backing_file=%s", bs->backing_file); + if (bs->drv) { + term_printf(" file="); + term_print_filename(bs->filename); + if (bs->backing_file[0] != '\0') { + term_printf(" backing_file="); + term_print_filename(bs->backing_file); + } term_printf(" ro=%d", bs->read_only); term_printf(" drv=%s", bs->drv->format_name); if (bs->encrypted) @@ -660,192 +960,474 @@ void bdrv_info(void) } } +/* The "info blockstats" command. */ +void bdrv_info_stats (void) +{ + BlockDriverState *bs; + + for (bs = bdrv_first; bs != NULL; bs = bs->next) { + term_printf ("%s:" + " rd_bytes=%" PRIu64 + " wr_bytes=%" PRIu64 + " rd_operations=%" PRIu64 + " wr_operations=%" PRIu64 + "\n", + bs->device_name, + bs->rd_bytes, bs->wr_bytes, + bs->rd_ops, bs->wr_ops); + } +} + +void bdrv_get_backing_filename(BlockDriverState *bs, + char *filename, int filename_size) +{ + if (!bs->backing_hd) { + pstrcpy(filename, filename_size, ""); + } else { + pstrcpy(filename, filename_size, bs->backing_file); + } +} + +int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors) +{ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_write_compressed) + return -ENOTSUP; + return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); +} + +int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) +{ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_get_info) + return -ENOTSUP; + memset(bdi, 0, sizeof(*bdi)); + return drv->bdrv_get_info(bs, bdi); +} + /**************************************************************/ -/* RAW block driver */ +/* handling of snapshots */ -typedef struct BDRVRawState { - int fd; -} BDRVRawState; +int bdrv_snapshot_create(BlockDriverState *bs, + QEMUSnapshotInfo *sn_info) +{ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_snapshot_create) + return -ENOTSUP; + return drv->bdrv_snapshot_create(bs, sn_info); +} -static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) +int bdrv_snapshot_goto(BlockDriverState *bs, + const char *snapshot_id) { - return 1; /* maybe */ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_snapshot_goto) + return -ENOTSUP; + return drv->bdrv_snapshot_goto(bs, snapshot_id); } -static int raw_open(BlockDriverState *bs, const char *filename) +int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) { - BDRVRawState *s = bs->opaque; - int fd; - int64_t size; -#ifdef _BSD - struct stat sb; -#endif -#ifdef __sun__ - struct dk_minfo minfo; - int rv; -#endif + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_snapshot_delete) + return -ENOTSUP; + return drv->bdrv_snapshot_delete(bs, snapshot_id); +} - fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); - if (fd < 0) { - fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); - if (fd < 0) - return -1; - bs->read_only = 1; +int bdrv_snapshot_list(BlockDriverState *bs, + QEMUSnapshotInfo **psn_info) +{ + BlockDriver *drv = bs->drv; + if (!drv) + return -ENOMEDIUM; + if (!drv->bdrv_snapshot_list) + return -ENOTSUP; + return drv->bdrv_snapshot_list(bs, psn_info); +} + +#define NB_SUFFIXES 4 + +char *get_human_readable_size(char *buf, int buf_size, int64_t size) +{ + static const char suffixes[NB_SUFFIXES] = "KMGT"; + int64_t base; + int i; + + if (size <= 999) { + snprintf(buf, buf_size, "%" PRId64, size); + } else { + base = 1024; + for(i = 0; i < NB_SUFFIXES; i++) { + if (size < (10 * base)) { + snprintf(buf, buf_size, "%0.1f%c", + (double)size / base, + suffixes[i]); + break; + } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { + snprintf(buf, buf_size, "%" PRId64 "%c", + ((size + (base >> 1)) / base), + suffixes[i]); + break; + } + base = base * 1024; + } } -#ifdef _BSD - if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) { -#ifdef DIOCGMEDIASIZE - if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) -#endif -#ifdef CONFIG_COCOA - size = LONG_LONG_MAX; + return buf; +} + +char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) +{ + char buf1[128], date_buf[128], clock_buf[128]; +#ifdef _WIN32 + struct tm *ptm; #else - size = lseek(fd, 0LL, SEEK_END); + struct tm tm; #endif - } else -#endif -#ifdef __sun__ - /* - * use the DKIOCGMEDIAINFO ioctl to read the size. - */ - rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo ); - if ( rv != -1 ) { - size = minfo.dki_lbsize * minfo.dki_capacity; - } else /* there are reports that lseek on some devices - fails, but irc discussion said that contingency - on contingency was overkill */ -#endif - { - size = lseek(fd, 0, SEEK_END); - } + time_t ti; + int64_t secs; + + if (!sn) { + snprintf(buf, buf_size, + "%-10s%-20s%7s%20s%15s", + "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); + } else { + ti = sn->date_sec; #ifdef _WIN32 - /* On Windows hosts it can happen that we're unable to get file size - for CD-ROM raw device (it's inherent limitation of the CDFS driver). */ - if (size == -1) - size = LONG_LONG_MAX; + ptm = localtime(&ti); + strftime(date_buf, sizeof(date_buf), + "%Y-%m-%d %H:%M:%S", ptm); +#else + localtime_r(&ti, &tm); + strftime(date_buf, sizeof(date_buf), + "%Y-%m-%d %H:%M:%S", &tm); #endif - bs->total_sectors = size / 512; - s->fd = fd; - return 0; + secs = sn->vm_clock_nsec / 1000000000; + snprintf(clock_buf, sizeof(clock_buf), + "%02d:%02d:%02d.%03d", + (int)(secs / 3600), + (int)((secs / 60) % 60), + (int)(secs % 60), + (int)((sn->vm_clock_nsec / 1000000) % 1000)); + snprintf(buf, buf_size, + "%-10s%-20s%7s%20s%15s", + sn->id_str, sn->name, + get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), + date_buf, + clock_buf); + } + return buf; } -static int raw_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) + +/**************************************************************/ +/* async I/Os */ + +BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, + uint8_t *buf, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque) { - BDRVRawState *s = bs->opaque; - int ret; + BlockDriver *drv = bs->drv; + BlockDriverAIOCB *ret; - lseek(s->fd, sector_num * 512, SEEK_SET); - ret = read(s->fd, buf, nb_sectors * 512); - if (ret != nb_sectors * 512) - return -1; - return 0; + if (!drv) + return NULL; + + /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ + if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { + memcpy(buf, bs->boot_sector_data, 512); + sector_num++; + nb_sectors--; + buf += 512; + } + + ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); + + if (ret) { + /* Update stats even though technically transfer has not happened. */ + bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; + bs->rd_ops ++; + } + + return ret; } -static int raw_write(BlockDriverState *bs, int64_t sector_num, - const uint8_t *buf, int nb_sectors) +BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque) { - BDRVRawState *s = bs->opaque; - int ret; + BlockDriver *drv = bs->drv; + BlockDriverAIOCB *ret; - lseek(s->fd, sector_num * 512, SEEK_SET); - ret = write(s->fd, buf, nb_sectors * 512); - if (ret != nb_sectors * 512) - return -1; - return 0; + if (!drv) + return NULL; + if (bs->read_only) + return NULL; + if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { + memcpy(bs->boot_sector_data, buf, 512); + } + + ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); + + if (ret) { + /* Update stats even though technically transfer has not happened. */ + bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; + bs->wr_ops ++; + } + + return ret; } -static void raw_close(BlockDriverState *bs) +void bdrv_aio_cancel(BlockDriverAIOCB *acb) { - BDRVRawState *s = bs->opaque; - close(s->fd); + BlockDriver *drv = acb->bs->drv; + + drv->bdrv_aio_cancel(acb); } -#ifdef _WIN32 -#include <windows.h> -#include <winioctl.h> -int qemu_ftruncate64(int fd, int64_t length) -{ - LARGE_INTEGER li; - LONG high; - HANDLE h; - BOOL res; +/**************************************************************/ +/* async block device emulation */ - if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0) - return -1; +static void bdrv_aio_bh_cb(void *opaque) +{ + BlockDriverAIOCBSync *acb = opaque; + acb->common.cb(acb->common.opaque, acb->ret); + qemu_aio_release(acb); +} - h = (HANDLE)_get_osfhandle(fd); +static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, + int64_t sector_num, uint8_t *buf, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque) +{ + BlockDriverAIOCBSync *acb; + int ret; - /* get current position, ftruncate do not change position */ - li.HighPart = 0; - li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT); - if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) - return -1; + acb = qemu_aio_get(bs, cb, opaque); + if (!acb->bh) + acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); + ret = bdrv_read(bs, sector_num, buf, nb_sectors); + acb->ret = ret; + qemu_bh_schedule(acb->bh); + return &acb->common; +} - high = length >> 32; - if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN)) - return -1; - res = SetEndOfFile(h); +static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, + int64_t sector_num, const uint8_t *buf, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque) +{ + BlockDriverAIOCBSync *acb; + int ret; - /* back to old position */ - SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN); - return res ? 0 : -1; + acb = qemu_aio_get(bs, cb, opaque); + if (!acb->bh) + acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); + ret = bdrv_write(bs, sector_num, buf, nb_sectors); + acb->ret = ret; + qemu_bh_schedule(acb->bh); + return &acb->common; } -static int set_sparse(int fd) +static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) { - DWORD returned; - return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE, - NULL, 0, NULL, 0, &returned, NULL); + BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; + qemu_bh_cancel(acb->bh); + qemu_aio_release(acb); } -#else -static inline int set_sparse(int fd) + +/**************************************************************/ +/* sync block device emulation */ + +static void bdrv_rw_em_cb(void *opaque, int ret) { - return 1; + *(int *)opaque = ret; } -#endif -static int raw_create(const char *filename, int64_t total_size, - const char *backing_file, int flags) +#define NOT_DONE 0x7fffffff + +static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, + uint8_t *buf, int nb_sectors) { - int fd; + int async_ret; + BlockDriverAIOCB *acb; - if (flags || backing_file) - return -ENOTSUP; + async_ret = NOT_DONE; + acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, + bdrv_rw_em_cb, &async_ret); + if (acb == NULL) + return -1; - fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, - 0644); - if (fd < 0) - return -EIO; - set_sparse(fd); - ftruncate(fd, total_size * 512); - close(fd); - return 0; + while (async_ret == NOT_DONE) { + qemu_aio_wait(); + } + + return async_ret; } -static void raw_flush(BlockDriverState *bs) +static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors) { - BDRVRawState *s = bs->opaque; - fsync(s->fd); -} + int async_ret; + BlockDriverAIOCB *acb; -BlockDriver bdrv_raw = { - "raw", - sizeof(BDRVRawState), - raw_probe, - raw_open, - raw_read, - raw_write, - raw_close, - raw_create, - raw_flush, -}; + async_ret = NOT_DONE; + acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, + bdrv_rw_em_cb, &async_ret); + if (acb == NULL) + return -1; + while (async_ret == NOT_DONE) { + qemu_aio_wait(); + } + return async_ret; +} void bdrv_init(void) { bdrv_register(&bdrv_raw); - bdrv_register(&bdrv_cloop); + bdrv_register(&bdrv_host_device); +#ifndef _WIN32 + bdrv_register(&bdrv_cow); +#endif bdrv_register(&bdrv_qcow); +#if 0 + bdrv_register(&bdrv_vmdk); +#endif + bdrv_register(&bdrv_cloop); bdrv_register(&bdrv_dmg); +#if 0 + bdrv_register(&bdrv_bochs); + bdrv_register(&bdrv_vpc); +#endif + bdrv_register(&bdrv_vvfat); +#if 0 + bdrv_register(&bdrv_qcow2); + bdrv_register(&bdrv_parallels); + bdrv_register(&bdrv_nbd); +#endif + qemu_aio_init(); +} + +void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, + void *opaque) +{ + BlockDriver *drv; + BlockDriverAIOCB *acb; + + drv = bs->drv; + if (drv->free_aiocb) { + acb = drv->free_aiocb; + drv->free_aiocb = acb->next; + } else { + acb = qemu_mallocz(drv->aiocb_size); + if (!acb) + return NULL; + } + acb->bs = bs; + acb->cb = cb; + acb->opaque = opaque; + return acb; +} + +void qemu_aio_release(void *p) +{ + BlockDriverAIOCB *acb = p; + BlockDriver *drv = acb->bs->drv; + acb->next = drv->free_aiocb; + drv->free_aiocb = acb; +} + +/**************************************************************/ +/* removable device support */ + +/** + * Return TRUE if the media is present + */ +int bdrv_is_inserted(BlockDriverState *bs) +{ + BlockDriver *drv = bs->drv; + int ret; + if (!drv) + return 0; + if (!drv->bdrv_is_inserted) + return 1; + ret = drv->bdrv_is_inserted(bs); + return ret; +} + +/** + * Return TRUE if the media changed since the last call to this + * function. It is currently only used for floppy disks + */ +int bdrv_media_changed(BlockDriverState *bs) +{ + BlockDriver *drv = bs->drv; + int ret; + + if (!drv || !drv->bdrv_media_changed) + ret = -ENOTSUP; + else + ret = drv->bdrv_media_changed(bs); + if (ret == -ENOTSUP) + ret = bs->media_changed; + bs->media_changed = 0; + return ret; +} + +/** + * If eject_flag is TRUE, eject the media. Otherwise, close the tray + */ +void bdrv_eject(BlockDriverState *bs, int eject_flag) +{ + BlockDriver *drv = bs->drv; + int ret; + + if (!drv || !drv->bdrv_eject) { + ret = -ENOTSUP; + } else { + ret = drv->bdrv_eject(bs, eject_flag); + } + if (ret == -ENOTSUP) { + if (eject_flag) + bdrv_close(bs); + } +} + +int bdrv_is_locked(BlockDriverState *bs) +{ + return bs->locked; +} + +/** + * Lock or unlock the media (if it is locked, the user won't be able + * to eject it manually). + */ +void bdrv_set_locked(BlockDriverState *bs, int locked) +{ + BlockDriver *drv = bs->drv; + + bs->locked = locked; + if (drv && drv->bdrv_set_locked) { + drv->bdrv_set_locked(bs, locked); + } +} + +/* needed for generic scsi interface */ + +int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) +{ + BlockDriver *drv = bs->drv; + + if (drv && drv->bdrv_ioctl) + return drv->bdrv_ioctl(bs, req, buf); + return -ENOTSUP; } |