/* * Block driver for RAW files (posix) * * Copyright (c) 2006 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu-common.h" #include "qemu-timer.h" #include "qemu-char.h" #include "qemu-log.h" #include "block_int.h" #include "module.h" #include "compatfd.h" #include #include "block/raw-posix-aio.h" #ifdef CONFIG_COCOA #include #include #include #include #include #include #include //#include #include #endif #ifdef __sun__ #define _POSIX_PTHREAD_SEMANTICS 1 #include #include #endif #ifdef __linux__ #include #include #include #include #endif #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) #include #include #include #endif #ifdef __OpenBSD__ #include #include #include #endif #ifdef __DragonFly__ #include #include #endif #ifdef CONFIG_XFS #include #endif //#define DEBUG_FLOPPY //#define DEBUG_BLOCK #if defined(DEBUG_BLOCK) #define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \ { qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0) #else #define DEBUG_BLOCK_PRINT(formatCstr, ...) #endif /* OS X does not have O_DSYNC */ #ifndef O_DSYNC #ifdef O_SYNC #define O_DSYNC O_SYNC #elif defined(O_FSYNC) #define O_DSYNC O_FSYNC #endif #endif /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */ #ifndef O_DIRECT #define O_DIRECT O_DSYNC #endif #define FTYPE_FILE 0 #define FTYPE_CD 1 #define FTYPE_FD 2 /* if the FD is not accessed during that time (in ns), we try to reopen it to see if the disk has been changed */ #define FD_OPEN_TIMEOUT (1000000000) #define MAX_BLOCKSIZE 4096 typedef struct BDRVRawState { int fd; int type; int open_flags; #if defined(__linux__) /* linux floppy specific */ int64_t fd_open_time; int64_t fd_error_time; int fd_got_error; int fd_media_changed; #endif #ifdef CONFIG_LINUX_AIO int use_aio; void *aio_ctx; #endif uint8_t *aligned_buf; unsigned aligned_buf_size; #ifdef CONFIG_XFS bool is_xfs : 1; #endif } BDRVRawState; static int fd_open(BlockDriverState *bs); static int64_t raw_getlength(BlockDriverState *bs); #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) static int cdrom_reopen(BlockDriverState *bs); #endif static int raw_open_common(BlockDriverState *bs, const char *filename, int bdrv_flags, int open_flags) { BDRVRawState *s = bs->opaque; int fd, ret; s->open_flags = open_flags | O_BINARY; s->open_flags &= ~O_ACCMODE; if (bdrv_flags & BDRV_O_RDWR) { s->open_flags |= O_RDWR; } else { s->open_flags |= O_RDONLY; } /* Use O_DSYNC for write-through caching, no flags for write-back caching, * and O_DIRECT for no caching. */ if ((bdrv_flags & BDRV_O_NOCACHE)) s->open_flags |= O_DIRECT; else if (!(bdrv_flags & BDRV_O_CACHE_WB)) s->open_flags |= O_DSYNC; s->fd = -1; fd = qemu_open(filename, s->open_flags, 0644); if (fd < 0) { ret = -errno; if (ret == -EROFS) ret = -EACCES; return ret; } s->fd = fd; s->aligned_buf = NULL; if ((bdrv_flags & BDRV_O_NOCACHE)) { /* * Allocate a buffer for read/modify/write cycles. Chose the size * pessimistically as we don't know the block size yet. */ s->aligned_buf_size = 32 * MAX_BLOCKSIZE; s->aligned_buf = qemu_memalign(MAX_BLOCKSIZE, s->aligned_buf_size); if (s->aligned_buf == NULL) { goto out_close; } } #ifdef CONFIG_LINUX_AIO if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) == (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) { /* We're falling back to POSIX AIO in some cases */ paio_init(); s->aio_ctx = laio_init(); if (!s->aio_ctx) { goto out_free_buf; } s->use_aio = 1; } else #endif { if (paio_init() < 0) { goto out_free_buf; } #ifdef CONFIG_LINUX_AIO s->use_aio = 0; #endif } #ifdef CONFIG_XFS if (platform_test_xfs_fd(s->fd)) { s->is_xfs = 1; } #endif return 0; out_free_buf: qemu_vfree(s->aligned_buf); out_close: close(fd); return -errno; } static int raw_open(BlockDriverState *bs, const char *filename, int flags) { BDRVRawState *s = bs->opaque; s->type = FTYPE_FILE; return raw_open_common(bs, filename, flags, 0); } /* XXX: use host sector size if necessary with: #ifdef DIOCGSECTORSIZE { unsigned int sectorsize = 512; if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) && sectorsize > bufsize) bufsize = sectorsize; } #endif #ifdef CONFIG_COCOA uint32_t blockSize = 512; if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) { bufsize = blockSize; } #endif */ /* * offset and count are in bytes, but must be multiples of 512 for files * opened with O_DIRECT. buf must be aligned to 512 bytes then. * * This function may be called without alignment if the caller ensures * that O_DIRECT is not in effect. */ static int raw_pread_aligned(BlockDriverState *bs, int64_t offset, uint8_t *buf, int count) { BDRVRawState *s = bs->opaque; int ret; ret = fd_open(bs); if (ret < 0) return ret; /* * In versions previous to 0.13.0 this code used lseek to seek to offset * and read instead of pread. The lseek only happened when offset was >=0 * with the change to pread the logic for checking whether offset was * negative was lost which broke vmdk4 support. This offset check here * will have the same result as the old (working) code. */ if (offset < 0) offset = 0; ret = pread(s->fd, buf, count, offset); if (ret == count) return ret; /* Allow reads beyond the end (needed for pwrite) */ if ((ret == 0) && bs->growable) { int64_t size = raw_getlength(bs); if (offset >= size) { memset(buf, 0, count); return count; } } DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64 "] read failed %d : %d = %s\n", s->fd, bs->filename, offset, buf, count, bs->total_sectors, ret, errno, strerror(errno)); /* Try harder for CDrom. */ if (s->type != FTYPE_FILE) { ret = pread(s->fd, buf, count, offset); if (ret == count) return ret; ret = pread(s->fd, buf, count, offset); if (ret == count) return ret; DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64 "] retry read failed %d : %d = %s\n", s->fd, bs->filename, offset, buf, count, bs->total_sectors, ret, errno, strerror(errno)); } return (ret < 0) ? -errno : ret; } /* * offset and count are in bytes, but must be multiples of the sector size * for files opened with O_DIRECT. buf must be aligned to sector size bytes * then. * * This function may be called without alignment if the caller ensures * that O_DIRECT is not in effect. */ static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset, const uint8_t *buf, int count) { BDRVRawState *s = bs->opaque; int ret; ret = fd_open(bs); if (ret < 0) return -errno; ret = pwrite(s->fd, buf, count, offset); if (ret == count) return ret; DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64 "] write failed %d : %d = %s\n", s->fd, bs->filename, offset, buf, count, bs->total_sectors, ret, errno, strerror(errno)); return (ret < 0) ? -errno : ret; } /* * offset and count are in bytes and possibly not aligned. For files opened * with O_DIRECT, necessary alignments are ensured before calling * raw_pread_aligned to do the actual read. */ static int raw_pread(BlockDriverState *bs, int64_t offset, uint8_t *buf, int count) { BDRVRawState *s = bs->opaque; unsigned sector_mask = bs->buffer_alignment - 1; int size, ret, shift, sum; sum = 0; if (s->aligned_buf != NULL) { if (offset & sector_mask) { /* align offset on a sector size bytes boundary */ shift = offset & sector_mask; size = (shift + count + sector_mask) & ~sector_mask; if (size > s->aligned_buf_size) size = s->aligned_buf_size; ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size); if (ret < 0) return ret; size = bs->buffer_alignment - shift; if (size > count) size = count; memcpy(buf, s->aligned_buf + shift, size); buf += size; offset += size; count -= size; sum += size; if (count == 0) return sum; } if (count & sector_mask || (uintptr_t) buf & sector_mask) { /* read on aligned buffer */ while (count) { size = (count + sector_mask) & ~sector_mask; if (size > s->aligned_buf_size) size = s->aligned_buf_size; ret = raw_pread_aligned(bs, offset, s->aligned_buf, size); if (ret < 0) { return ret; } else if (ret == 0) { fprintf(stderr, "raw_pread: read beyond end of file\n"); abort(); } size = ret; if (size > count) size = count; memcpy(buf, s->aligned_buf, size); buf += size; offset += size; count -= size; sum += size; } return sum; } } return raw_pread_aligned(bs, offset, buf, count) + sum; } static int raw_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors) { int ret; ret = raw_pread(bs, sector_num * BDRV_SECTOR_SIZE, buf, nb_sectors * BDRV_SECTOR_SIZE); if (ret == (nb_sectors * BDRV_SECTOR_SIZE)) ret = 0; return ret; } /* * offset and count are in bytes and possibly not aligned. For files opened * with O_DIRECT, necessary alignments are ensured before calling * raw_pwrite_aligned to do the actual write. */ static int raw_pwrite(BlockDriverState *bs, int64_t offset, const uint8_t *buf, int count) { BDRVRawState *s = bs->opaque; unsigned sector_mask = bs->buffer_alignment - 1; int size, ret, shift, sum; sum = 0; if (s->aligned_buf != NULL) { if (offset & sector_mask) { /* align offset on a sector size bytes boundary */ shift = offset & sector_mask; ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, bs->buffer_alignment); if (ret < 0) return ret; size = bs->buffer_alignment - shift; if (size > count) size = count; memcpy(s->aligned_buf + shift, buf, size); ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, bs->buffer_alignment); if (ret < 0) return ret; buf += size; offset += size; count -= size; sum += size; if (count == 0) return sum; } if (count & sector_mask || (uintptr_t) buf & sector_mask) { while ((size = (count & ~sector_mask)) != 0) { if (size > s->aligned_buf_size) size = s->aligned_buf_size; memcpy(s->aligned_buf, buf, size); ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size); if (ret < 0) return ret; buf += ret; offset += ret; count -= ret; sum += ret; } /* here, count < sector_size because (count & ~sector_mask) == 0 */ if (count) { ret = raw_pread_aligned(bs, offset, s->aligned_buf, bs->buffer_alignment); if (ret < 0) return ret; memcpy(s->aligned_buf, buf, count); ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, bs->buffer_alignment); if (ret < 0) return ret; if (count < ret) ret = count; sum += ret; } return sum; } } return raw_pwrite_aligned(bs, offset, buf, count) + sum; } static int raw_write(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors) { int ret; ret = raw_pwrite(bs, sector_num * BDRV_SECTOR_SIZE, buf, nb_sectors * BDRV_SECTOR_SIZE); if (ret == (nb_sectors * BDRV_SECTOR_SIZE)) ret = 0; return ret; } /* * Check if all memory in this vector is sector aligned. */ static int qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) { int i; for (i = 0; i < qiov->niov; i++) { if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { return 0; } } return 1; } static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque, int type) { BDRVRawState *s = bs->opaque; if (fd_open(bs) < 0) return NULL; /* * If O_DIRECT is used the buffer needs to be aligned on a sector * boundary. Check if this is the case or telll the low-level * driver that it needs to copy the buffer. */ if (s->aligned_buf) { if (!qiov_is_aligned(bs, qiov)) { type |= QEMU_AIO_MISALIGNED; #ifdef CONFIG_LINUX_AIO } else if (s->use_aio) { return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov, nb_sectors, cb, opaque, type); #endif } } return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors, cb, opaque, type); } static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { return raw_aio_submit(bs, sector_num, qiov, nb_sectors, cb, opaque, QEMU_AIO_READ); } static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { return raw_aio_submit(bs, sector_num, qiov, nb_sectors, cb, opaque, QEMU_AIO_WRITE); } static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs, BlockDriverCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; if (fd_open(bs) < 0) return NULL; return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH); } static void raw_close(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; if (s->fd >= 0) { close(s->fd); s->fd = -1; if (s->aligned_buf != NULL) qemu_vfree(s->aligned_buf); } } static int raw_truncate(BlockDriverState *bs, int64_t offset) { BDRVRawState *s = bs->opaque; if (s->type != FTYPE_FILE) return -ENOTSUP; if (ftruncate(s->fd, offset) < 0) return -errno; return 0; } #ifdef __OpenBSD__ static int64_t raw_getlength(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int fd = s->fd; struct stat st; if (fstat(fd, &st)) return -1; if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { struct disklabel dl; if (ioctl(fd, DIOCGDINFO, &dl)) return -1; return (uint64_t)dl.d_secsize * dl.d_partitions[DISKPART(st.st_rdev)].p_size; } else return st.st_size; } #elif defined(__sun__) static int64_t raw_getlength(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; struct dk_minfo minfo; int ret; ret = fd_open(bs); if (ret < 0) { return ret; } /* * Use the DKIOCGMEDIAINFO ioctl to read the size. */ ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo); if (ret != -1) { return minfo.dki_lbsize * minfo.dki_capacity; } /* * There are reports that lseek on some devices fails, but * irc discussion said that contingency on contingency was overkill. */ return lseek(s->fd, 0, SEEK_END); } #elif defined(CONFIG_BSD) static int64_t raw_getlength(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int fd = s->fd; int64_t size; struct stat sb; #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) int reopened = 0; #endif int ret; ret = fd_open(bs); if (ret < 0) return ret; #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) again: #endif if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) { #ifdef DIOCGMEDIASIZE if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) #elif defined(DIOCGPART) { struct partinfo pi; if (ioctl(fd, DIOCGPART, &pi) == 0) size = pi.media_size; else size = 0; } if (size == 0) #endif #ifdef CONFIG_COCOA size = LONG_LONG_MAX; #else size = lseek(fd, 0LL, SEEK_END); #endif #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) switch(s->type) { case FTYPE_CD: /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */ if (size == 2048LL * (unsigned)-1) size = 0; /* XXX no disc? maybe we need to reopen... */ if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) { reopened = 1; goto again; } } #endif } else { size = lseek(fd, 0, SEEK_END); } return size; } #else static int64_t raw_getlength(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int ret; ret = fd_open(bs); if (ret < 0) { return ret; } return lseek(s->fd, 0, SEEK_END); } #endif static int raw_create(const char *filename, QEMUOptionParameter *options) { int fd; int result = 0; int64_t total_size = 0; /* Read out options */ while (options && options->name) { if (!strcmp(options->name, BLOCK_OPT_SIZE)) { total_size = options->value.n / BDRV_SECTOR_SIZE; } options++; } fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); if (fd < 0) { result = -errno; } else { if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) { result = -errno; } if (close(fd) != 0) { result = -errno; } } return result; } static int raw_flush(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; return qemu_fdatasync(s->fd); } #ifdef CONFIG_XFS static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors) { struct xfs_flock64 fl; memset(&fl, 0, sizeof(fl)); fl.l_whence = SEEK_SET; fl.l_start = sector_num << 9; fl.l_len = (int64_t)nb_sectors << 9; if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) { DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno)); return -errno; } return 0; } #endif static int raw_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) { #ifdef CONFIG_XFS BDRVRawState *s = bs->opaque; if (s->is_xfs) { return xfs_discard(s, sector_num, nb_sectors); } #endif return 0; } static QEMUOptionParameter raw_create_options[] = { { .name = BLOCK_OPT_SIZE, .type = OPT_SIZE, .help = "Virtual disk size" }, { NULL } }; static BlockDriver bdrv_file = { .format_name = "file", .protocol_name = "file", .instance_size = sizeof(BDRVRawState), .bdrv_probe = NULL, /* no probe for protocols */ .bdrv_file_open = raw_open, .bdrv_read = raw_read, .bdrv_write = raw_write, .bdrv_close = raw_close, .bdrv_create = raw_create, .bdrv_flush = raw_flush, .bdrv_discard = raw_discard, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .create_options = raw_create_options, }; /***********************************************/ /* host device */ #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 ) { 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; } kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ) { 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 ); } IOObjectRelease( nextMedia ); } return kernResult; } #endif static int hdev_probe_device(const char *filename) { struct stat st; /* allow a dedicated CD-ROM driver to match with a higher priority */ if (strstart(filename, "/dev/cdrom", NULL)) return 50; if (stat(filename, &st) >= 0 && (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { return 100; } return 0; } static int hdev_open(BlockDriverState *bs, const char *filename, int flags) { BDRVRawState *s = bs->opaque; #ifdef CONFIG_COCOA if (strstart(filename, "/dev/cdrom", NULL)) { 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; } if ( mediaIterator ) IOObjectRelease( mediaIterator ); } #endif s->type = FTYPE_FILE; #if defined(__linux__) { char resolved_path[ MAXPATHLEN ], *temp; temp = realpath(filename, resolved_path); if (temp && strstart(temp, "/dev/sg", NULL)) { bs->sg = 1; } } #endif return raw_open_common(bs, filename, flags, 0); } #if defined(__linux__) /* Note: we do not have a reliable method to detect if the floppy is present. The current method is to try to open the floppy at every I/O and to keep it opened during a few hundreds of ms. */ static int fd_open(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int last_media_present; if (s->type != FTYPE_FD) return 0; last_media_present = (s->fd >= 0); if (s->fd >= 0 && (get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) { close(s->fd); s->fd = -1; #ifdef DEBUG_FLOPPY printf("Floppy closed\n"); #endif } if (s->fd < 0) { if (s->fd_got_error && (get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) { #ifdef DEBUG_FLOPPY printf("No floppy (open delayed)\n"); #endif return -EIO; } s->fd = open(bs->filename, s->open_flags & ~O_NONBLOCK); if (s->fd < 0) { s->fd_error_time = get_clock(); s->fd_got_error = 1; if (last_media_present) s->fd_media_changed = 1; #ifdef DEBUG_FLOPPY printf("No floppy\n"); #endif return -EIO; } #ifdef DEBUG_FLOPPY printf("Floppy opened\n"); #endif } if (!last_media_present) s->fd_media_changed = 1; s->fd_open_time = get_clock(); s->fd_got_error = 0; return 0; } static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) { BDRVRawState *s = bs->opaque; return ioctl(s->fd, req, buf); } static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs, unsigned long int req, void *buf, BlockDriverCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; if (fd_open(bs) < 0) return NULL; return paio_ioctl(bs, s->fd, req, buf, cb, opaque); } #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) static int fd_open(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; /* this is just to ensure s->fd is sane (its called by io ops) */ if (s->fd >= 0) return 0; return -EIO; } #else /* !linux && !FreeBSD */ static int fd_open(BlockDriverState *bs) { return 0; } #endif /* !linux && !FreeBSD */ static int hdev_create(const char *filename, QEMUOptionParameter *options) { int fd; int ret = 0; struct stat stat_buf; int64_t total_size = 0; /* Read out options */ while (options && options->name) { if (!strcmp(options->name, "size")) { total_size = options->value.n / BDRV_SECTOR_SIZE; } options++; } fd = open(filename, O_WRONLY | O_BINARY); if (fd < 0) return -errno; if (fstat(fd, &stat_buf) < 0) ret = -errno; else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) ret = -ENODEV; else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE) ret = -ENOSPC; close(fd); return ret; } static int hdev_has_zero_init(BlockDriverState *bs) { return 0; } static BlockDriver bdrv_host_device = { .format_name = "host_device", .protocol_name = "host_device", .instance_size = sizeof(BDRVRawState), .bdrv_probe_device = hdev_probe_device, .bdrv_file_open = hdev_open, .bdrv_close = raw_close, .bdrv_create = hdev_create, .create_options = raw_create_options, .bdrv_has_zero_init = hdev_has_zero_init, .bdrv_flush = raw_flush, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_read = raw_read, .bdrv_write = raw_write, .bdrv_getlength = raw_getlength, /* generic scsi device */ #ifdef __linux__ .bdrv_ioctl = hdev_ioctl, .bdrv_aio_ioctl = hdev_aio_ioctl, #endif }; #ifdef __linux__ static int floppy_open(BlockDriverState *bs, const char *filename, int flags) { BDRVRawState *s = bs->opaque; int ret; s->type = FTYPE_FD; /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */ ret = raw_open_common(bs, filename, flags, O_NONBLOCK); if (ret) return ret; /* close fd so that we can reopen it as needed */ close(s->fd); s->fd = -1; s->fd_media_changed = 1; return 0; } static int floppy_probe_device(const char *filename) { int fd, ret; int prio = 0; struct floppy_struct fdparam; if (strstart(filename, "/dev/fd", NULL)) prio = 50; fd = open(filename, O_RDONLY | O_NONBLOCK); if (fd < 0) { goto out; } /* Attempt to detect via a floppy specific ioctl */ ret = ioctl(fd, FDGETPRM, &fdparam); if (ret >= 0) prio = 100; close(fd); out: return prio; } static int floppy_is_inserted(BlockDriverState *bs) { return fd_open(bs) >= 0; } static int floppy_media_changed(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int ret; /* * XXX: we do not have a true media changed indication. * It does not work if the floppy is changed without trying to read it. */ fd_open(bs); ret = s->fd_media_changed; s->fd_media_changed = 0; #ifdef DEBUG_FLOPPY printf("Floppy changed=%d\n", ret); #endif return ret; } static int floppy_eject(BlockDriverState *bs, int eject_flag) { BDRVRawState *s = bs->opaque; int fd; if (s->fd >= 0) { close(s->fd); s->fd = -1; } fd = open(bs->filename, s->open_flags | O_NONBLOCK); if (fd >= 0) { if (ioctl(fd, FDEJECT, 0) < 0) perror("FDEJECT"); close(fd); } return 0; } static BlockDriver bdrv_host_floppy = { .format_name = "host_floppy", .protocol_name = "host_floppy", .instance_size = sizeof(BDRVRawState), .bdrv_probe_device = floppy_probe_device, .bdrv_file_open = floppy_open, .bdrv_close = raw_close, .bdrv_create = hdev_create, .create_options = raw_create_options, .bdrv_has_zero_init = hdev_has_zero_init, .bdrv_flush = raw_flush, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_read = raw_read, .bdrv_write = raw_write, .bdrv_getlength = raw_getlength, /* removable device support */ .bdrv_is_inserted = floppy_is_inserted, .bdrv_media_changed = floppy_media_changed, .bdrv_eject = floppy_eject, }; static int cdrom_open(BlockDriverState *bs, const char *filename, int flags) { BDRVRawState *s = bs->opaque; s->type = FTYPE_CD; /* open will not fail even if no CD is inserted, so add O_NONBLOCK */ return raw_open_common(bs, filename, flags, O_NONBLOCK); } static int cdrom_probe_device(const char *filename) { int fd, ret; int prio = 0; fd = open(filename, O_RDONLY | O_NONBLOCK); if (fd < 0) { goto out; } /* Attempt to detect via a CDROM specific ioctl */ ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); if (ret >= 0) prio = 100; close(fd); out: return prio; } static int cdrom_is_inserted(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int ret; ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); if (ret == CDS_DISC_OK) return 1; return 0; } static int cdrom_eject(BlockDriverState *bs, int eject_flag) { BDRVRawState *s = bs->opaque; if (eject_flag) { if (ioctl(s->fd, CDROMEJECT, NULL) < 0) perror("CDROMEJECT"); } else { if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0) perror("CDROMEJECT"); } return 0; } static int cdrom_set_locked(BlockDriverState *bs, int locked) { BDRVRawState *s = bs->opaque; if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) { /* * Note: an error can happen if the distribution automatically * mounts the CD-ROM */ /* perror("CDROM_LOCKDOOR"); */ } return 0; } static BlockDriver bdrv_host_cdrom = { .format_name = "host_cdrom", .protocol_name = "host_cdrom", .instance_size = sizeof(BDRVRawState), .bdrv_probe_device = cdrom_probe_device, .bdrv_file_open = cdrom_open, .bdrv_close = raw_close, .bdrv_create = hdev_create, .create_options = raw_create_options, .bdrv_has_zero_init = hdev_has_zero_init, .bdrv_flush = raw_flush, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_read = raw_read, .bdrv_write = raw_write, .bdrv_getlength = raw_getlength, /* removable device support */ .bdrv_is_inserted = cdrom_is_inserted, .bdrv_eject = cdrom_eject, .bdrv_set_locked = cdrom_set_locked, /* generic scsi device */ .bdrv_ioctl = hdev_ioctl, .bdrv_aio_ioctl = hdev_aio_ioctl, }; #endif /* __linux__ */ #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) static int cdrom_open(BlockDriverState *bs, const char *filename, int flags) { BDRVRawState *s = bs->opaque; int ret; s->type = FTYPE_CD; ret = raw_open_common(bs, filename, flags, 0); if (ret) return ret; /* make sure the door isnt locked at this time */ ioctl(s->fd, CDIOCALLOW); return 0; } static int cdrom_probe_device(const char *filename) { if (strstart(filename, "/dev/cd", NULL) || strstart(filename, "/dev/acd", NULL)) return 100; return 0; } static int cdrom_reopen(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int fd; /* * Force reread of possibly changed/newly loaded disc, * FreeBSD seems to not notice sometimes... */ if (s->fd >= 0) close(s->fd); fd = open(bs->filename, s->open_flags, 0644); if (fd < 0) { s->fd = -1; return -EIO; } s->fd = fd; /* make sure the door isnt locked at this time */ ioctl(s->fd, CDIOCALLOW); return 0; } static int cdrom_is_inserted(BlockDriverState *bs) { return raw_getlength(bs) > 0; } static int cdrom_eject(BlockDriverState *bs, int eject_flag) { BDRVRawState *s = bs->opaque; if (s->fd < 0) return -ENOTSUP; (void) ioctl(s->fd, CDIOCALLOW); if (eject_flag) { if (ioctl(s->fd, CDIOCEJECT) < 0) perror("CDIOCEJECT"); } else { if (ioctl(s->fd, CDIOCCLOSE) < 0) perror("CDIOCCLOSE"); } if (cdrom_reopen(bs) < 0) return -ENOTSUP; return 0; } static int cdrom_set_locked(BlockDriverState *bs, int locked) { BDRVRawState *s = bs->opaque; if (s->fd < 0) return -ENOTSUP; if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) { /* * Note: an error can happen if the distribution automatically * mounts the CD-ROM */ /* perror("CDROM_LOCKDOOR"); */ } return 0; } static BlockDriver bdrv_host_cdrom = { .format_name = "host_cdrom", .protocol_name = "host_cdrom", .instance_size = sizeof(BDRVRawState), .bdrv_probe_device = cdrom_probe_device, .bdrv_file_open = cdrom_open, .bdrv_close = raw_close, .bdrv_create = hdev_create, .create_options = raw_create_options, .bdrv_has_zero_init = hdev_has_zero_init, .bdrv_flush = raw_flush, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_read = raw_read, .bdrv_write = raw_write, .bdrv_getlength = raw_getlength, /* removable device support */ .bdrv_is_inserted = cdrom_is_inserted, .bdrv_eject = cdrom_eject, .bdrv_set_locked = cdrom_set_locked, }; #endif /* __FreeBSD__ */ static void bdrv_file_init(void) { /* * Register all the drivers. Note that order is important, the driver * registered last will get probed first. */ bdrv_register(&bdrv_file); bdrv_register(&bdrv_host_device); #ifdef __linux__ bdrv_register(&bdrv_host_floppy); bdrv_register(&bdrv_host_cdrom); #endif #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) bdrv_register(&bdrv_host_cdrom); #endif } block_init(bdrv_file_init);