/* * 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/osdep.h" #include "qemu-common.h" #include "qemu/error-report.h" #include "qemu/timer.h" #include "qemu/log.h" #include "block/block_int.h" #include "qemu/module.h" #include "trace.h" #include "block/thread-pool.h" #include "qemu/iov.h" #include "raw-aio.h" #include "qapi/util.h" #include "qapi/qmp/qstring.h" #if defined(__APPLE__) && (__MACH__) #include #include #include #include #include #include #include //#include #include #endif #ifdef __sun__ #define _POSIX_PTHREAD_SEMANTICS 1 #include #endif #ifdef __linux__ #include #include #include #include #include #include #include #ifdef __s390__ #include #endif #ifndef FS_NOCOW_FL #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ #endif #endif #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE) #include #endif #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) #include #include #endif #ifdef __OpenBSD__ #include #include #include #endif #ifdef __NetBSD__ #include #include #include #include #endif #ifdef __DragonFly__ #include #include #endif #ifdef CONFIG_XFS #include #endif //#define DEBUG_BLOCK #ifdef DEBUG_BLOCK # define DEBUG_BLOCK_PRINT 1 #else # define DEBUG_BLOCK_PRINT 0 #endif #define DPRINTF(fmt, ...) \ do { \ if (DEBUG_BLOCK_PRINT) { \ printf(fmt, ## __VA_ARGS__); \ } \ } while (0) /* 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 MAX_BLOCKSIZE 4096 typedef struct BDRVRawState { int fd; int type; int open_flags; size_t buf_align; #ifdef CONFIG_LINUX_AIO int use_aio; void *aio_ctx; #endif #ifdef CONFIG_XFS bool is_xfs:1; #endif bool has_discard:1; bool has_write_zeroes:1; bool discard_zeroes:1; bool has_fallocate; bool needs_alignment; } BDRVRawState; typedef struct BDRVRawReopenState { int fd; int open_flags; #ifdef CONFIG_LINUX_AIO int use_aio; #endif } BDRVRawReopenState; static int fd_open(BlockDriverState *bs); static int64_t raw_getlength(BlockDriverState *bs); typedef struct RawPosixAIOData { BlockDriverState *bs; int aio_fildes; union { struct iovec *aio_iov; void *aio_ioctl_buf; }; int aio_niov; uint64_t aio_nbytes; #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */ off_t aio_offset; int aio_type; } RawPosixAIOData; #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) static int cdrom_reopen(BlockDriverState *bs); #endif #if defined(__NetBSD__) static int raw_normalize_devicepath(const char **filename) { static char namebuf[PATH_MAX]; const char *dp, *fname; struct stat sb; fname = *filename; dp = strrchr(fname, '/'); if (lstat(fname, &sb) < 0) { fprintf(stderr, "%s: stat failed: %s\n", fname, strerror(errno)); return -errno; } if (!S_ISBLK(sb.st_mode)) { return 0; } if (dp == NULL) { snprintf(namebuf, PATH_MAX, "r%s", fname); } else { snprintf(namebuf, PATH_MAX, "%.*s/r%s", (int)(dp - fname), fname, dp + 1); } fprintf(stderr, "%s is a block device", fname); *filename = namebuf; fprintf(stderr, ", using %s\n", *filename); return 0; } #else static int raw_normalize_devicepath(const char **filename) { return 0; } #endif /* * Get logical block size via ioctl. On success store it in @sector_size_p. */ static int probe_logical_blocksize(int fd, unsigned int *sector_size_p) { unsigned int sector_size; bool success = false; errno = ENOTSUP; /* Try a few ioctls to get the right size */ #ifdef BLKSSZGET if (ioctl(fd, BLKSSZGET, §or_size) >= 0) { *sector_size_p = sector_size; success = true; } #endif #ifdef DKIOCGETBLOCKSIZE if (ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) >= 0) { *sector_size_p = sector_size; success = true; } #endif #ifdef DIOCGSECTORSIZE if (ioctl(fd, DIOCGSECTORSIZE, §or_size) >= 0) { *sector_size_p = sector_size; success = true; } #endif return success ? 0 : -errno; } /** * Get physical block size of @fd. * On success, store it in @blk_size and return 0. * On failure, return -errno. */ static int probe_physical_blocksize(int fd, unsigned int *blk_size) { #ifdef BLKPBSZGET if (ioctl(fd, BLKPBSZGET, blk_size) < 0) { return -errno; } return 0; #else return -ENOTSUP; #endif } /* Check if read is allowed with given memory buffer and length. * * This function is used to check O_DIRECT memory buffer and request alignment. */ static bool raw_is_io_aligned(int fd, void *buf, size_t len) { ssize_t ret = pread(fd, buf, len, 0); if (ret >= 0) { return true; } #ifdef __linux__ /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore * other errors (e.g. real I/O error), which could happen on a failed * drive, since we only care about probing alignment. */ if (errno != EINVAL) { return true; } #endif return false; } static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp) { BDRVRawState *s = bs->opaque; char *buf; size_t max_align = MAX(MAX_BLOCKSIZE, getpagesize()); /* For SCSI generic devices the alignment is not really used. With buffered I/O, we don't have any restrictions. */ if (bdrv_is_sg(bs) || !s->needs_alignment) { bs->request_alignment = 1; s->buf_align = 1; return; } bs->request_alignment = 0; s->buf_align = 0; /* Let's try to use the logical blocksize for the alignment. */ if (probe_logical_blocksize(fd, &bs->request_alignment) < 0) { bs->request_alignment = 0; } #ifdef CONFIG_XFS if (s->is_xfs) { struct dioattr da; if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) { bs->request_alignment = da.d_miniosz; /* The kernel returns wrong information for d_mem */ /* s->buf_align = da.d_mem; */ } } #endif /* If we could not get the sizes so far, we can only guess them */ if (!s->buf_align) { size_t align; buf = qemu_memalign(max_align, 2 * max_align); for (align = 512; align <= max_align; align <<= 1) { if (raw_is_io_aligned(fd, buf + align, max_align)) { s->buf_align = align; break; } } qemu_vfree(buf); } if (!bs->request_alignment) { size_t align; buf = qemu_memalign(s->buf_align, max_align); for (align = 512; align <= max_align; align <<= 1) { if (raw_is_io_aligned(fd, buf, align)) { bs->request_alignment = align; break; } } qemu_vfree(buf); } if (!s->buf_align || !bs->request_alignment) { error_setg(errp, "Could not find working O_DIRECT alignment. " "Try cache.direct=off."); } } static void raw_parse_flags(int bdrv_flags, int *open_flags) { assert(open_flags != NULL); *open_flags |= O_BINARY; *open_flags &= ~O_ACCMODE; if (bdrv_flags & BDRV_O_RDWR) { *open_flags |= O_RDWR; } else { *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)) { *open_flags |= O_DIRECT; } } static void raw_detach_aio_context(BlockDriverState *bs) { #ifdef CONFIG_LINUX_AIO BDRVRawState *s = bs->opaque; if (s->use_aio) { laio_detach_aio_context(s->aio_ctx, bdrv_get_aio_context(bs)); } #endif } static void raw_attach_aio_context(BlockDriverState *bs, AioContext *new_context) { #ifdef CONFIG_LINUX_AIO BDRVRawState *s = bs->opaque; if (s->use_aio) { laio_attach_aio_context(s->aio_ctx, new_context); } #endif } #ifdef CONFIG_LINUX_AIO static int raw_set_aio(void **aio_ctx, int *use_aio, int bdrv_flags) { int ret = -1; assert(aio_ctx != NULL); assert(use_aio != NULL); /* * Currently Linux do AIO only for files opened with O_DIRECT * specified so check NOCACHE flag too */ if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) == (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) { /* if non-NULL, laio_init() has already been run */ if (*aio_ctx == NULL) { *aio_ctx = laio_init(); if (!*aio_ctx) { goto error; } } *use_aio = 1; } else { *use_aio = 0; } ret = 0; error: return ret; } #endif static void raw_parse_filename(const char *filename, QDict *options, Error **errp) { /* The filename does not have to be prefixed by the protocol name, since * "file" is the default protocol; therefore, the return value of this * function call can be ignored. */ strstart(filename, "file:", &filename); qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename))); } static QemuOptsList raw_runtime_opts = { .name = "raw", .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head), .desc = { { .name = "filename", .type = QEMU_OPT_STRING, .help = "File name of the image", }, { /* end of list */ } }, }; static int raw_open_common(BlockDriverState *bs, QDict *options, int bdrv_flags, int open_flags, Error **errp) { BDRVRawState *s = bs->opaque; QemuOpts *opts; Error *local_err = NULL; const char *filename = NULL; int fd, ret; struct stat st; opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); qemu_opts_absorb_qdict(opts, options, &local_err); if (local_err) { error_propagate(errp, local_err); ret = -EINVAL; goto fail; } filename = qemu_opt_get(opts, "filename"); ret = raw_normalize_devicepath(&filename); if (ret != 0) { error_setg_errno(errp, -ret, "Could not normalize device path"); goto fail; } s->open_flags = open_flags; raw_parse_flags(bdrv_flags, &s->open_flags); s->fd = -1; fd = qemu_open(filename, s->open_flags, 0644); if (fd < 0) { ret = -errno; if (ret == -EROFS) { ret = -EACCES; } goto fail; } s->fd = fd; #ifdef CONFIG_LINUX_AIO if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) { qemu_close(fd); ret = -errno; error_setg_errno(errp, -ret, "Could not set AIO state"); goto fail; } if (!s->use_aio && (bdrv_flags & BDRV_O_NATIVE_AIO)) { error_setg(errp, "aio=native was specified, but it requires " "cache.direct=on, which was not specified."); ret = -EINVAL; goto fail; } #else if (bdrv_flags & BDRV_O_NATIVE_AIO) { error_setg(errp, "aio=native was specified, but is not supported " "in this build."); ret = -EINVAL; goto fail; } #endif /* !defined(CONFIG_LINUX_AIO) */ s->has_discard = true; s->has_write_zeroes = true; if ((bs->open_flags & BDRV_O_NOCACHE) != 0) { s->needs_alignment = true; } if (fstat(s->fd, &st) < 0) { ret = -errno; error_setg_errno(errp, errno, "Could not stat file"); goto fail; } if (S_ISREG(st.st_mode)) { s->discard_zeroes = true; s->has_fallocate = true; } if (S_ISBLK(st.st_mode)) { #ifdef BLKDISCARDZEROES unsigned int arg; if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) { s->discard_zeroes = true; } #endif #ifdef __linux__ /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do * not rely on the contents of discarded blocks unless using O_DIRECT. * Same for BLKZEROOUT. */ if (!(bs->open_flags & BDRV_O_NOCACHE)) { s->discard_zeroes = false; s->has_write_zeroes = false; } #endif } #ifdef __FreeBSD__ if (S_ISCHR(st.st_mode)) { /* * The file is a char device (disk), which on FreeBSD isn't behind * a pager, so force all requests to be aligned. This is needed * so QEMU makes sure all IO operations on the device are aligned * to sector size, or else FreeBSD will reject them with EINVAL. */ s->needs_alignment = true; } #endif #ifdef CONFIG_XFS if (platform_test_xfs_fd(s->fd)) { s->is_xfs = true; } #endif raw_attach_aio_context(bs, bdrv_get_aio_context(bs)); ret = 0; fail: if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) { unlink(filename); } qemu_opts_del(opts); return ret; } static int raw_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVRawState *s = bs->opaque; Error *local_err = NULL; int ret; s->type = FTYPE_FILE; ret = raw_open_common(bs, options, flags, 0, &local_err); if (local_err) { error_propagate(errp, local_err); } return ret; } static int raw_reopen_prepare(BDRVReopenState *state, BlockReopenQueue *queue, Error **errp) { BDRVRawState *s; BDRVRawReopenState *raw_s; int ret = 0; Error *local_err = NULL; assert(state != NULL); assert(state->bs != NULL); s = state->bs->opaque; state->opaque = g_new0(BDRVRawReopenState, 1); raw_s = state->opaque; #ifdef CONFIG_LINUX_AIO raw_s->use_aio = s->use_aio; /* we can use s->aio_ctx instead of a copy, because the use_aio flag is * valid in the 'false' condition even if aio_ctx is set, and raw_set_aio() * won't override aio_ctx if aio_ctx is non-NULL */ if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) { error_setg(errp, "Could not set AIO state"); return -1; } #endif if (s->type == FTYPE_CD) { raw_s->open_flags |= O_NONBLOCK; } raw_parse_flags(state->flags, &raw_s->open_flags); raw_s->fd = -1; int fcntl_flags = O_APPEND | O_NONBLOCK; #ifdef O_NOATIME fcntl_flags |= O_NOATIME; #endif #ifdef O_ASYNC /* Not all operating systems have O_ASYNC, and those that don't * will not let us track the state into raw_s->open_flags (typically * you achieve the same effect with an ioctl, for example I_SETSIG * on Solaris). But we do not use O_ASYNC, so that's fine. */ assert((s->open_flags & O_ASYNC) == 0); #endif if ((raw_s->open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) { /* dup the original fd */ /* TODO: use qemu fcntl wrapper */ #ifdef F_DUPFD_CLOEXEC raw_s->fd = fcntl(s->fd, F_DUPFD_CLOEXEC, 0); #else raw_s->fd = dup(s->fd); if (raw_s->fd != -1) { qemu_set_cloexec(raw_s->fd); } #endif if (raw_s->fd >= 0) { ret = fcntl_setfl(raw_s->fd, raw_s->open_flags); if (ret) { qemu_close(raw_s->fd); raw_s->fd = -1; } } } /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */ if (raw_s->fd == -1) { const char *normalized_filename = state->bs->filename; ret = raw_normalize_devicepath(&normalized_filename); if (ret < 0) { error_setg_errno(errp, -ret, "Could not normalize device path"); } else { assert(!(raw_s->open_flags & O_CREAT)); raw_s->fd = qemu_open(normalized_filename, raw_s->open_flags); if (raw_s->fd == -1) { error_setg_errno(errp, errno, "Could not reopen file"); ret = -1; } } } /* Fail already reopen_prepare() if we can't get a working O_DIRECT * alignment with the new fd. */ if (raw_s->fd != -1) { raw_probe_alignment(state->bs, raw_s->fd, &local_err); if (local_err) { qemu_close(raw_s->fd); raw_s->fd = -1; error_propagate(errp, local_err); ret = -EINVAL; } } return ret; } static void raw_reopen_commit(BDRVReopenState *state) { BDRVRawReopenState *raw_s = state->opaque; BDRVRawState *s = state->bs->opaque; s->open_flags = raw_s->open_flags; qemu_close(s->fd); s->fd = raw_s->fd; #ifdef CONFIG_LINUX_AIO s->use_aio = raw_s->use_aio; #endif g_free(state->opaque); state->opaque = NULL; } static void raw_reopen_abort(BDRVReopenState *state) { BDRVRawReopenState *raw_s = state->opaque; /* nothing to do if NULL, we didn't get far enough */ if (raw_s == NULL) { return; } if (raw_s->fd >= 0) { qemu_close(raw_s->fd); raw_s->fd = -1; } g_free(state->opaque); state->opaque = NULL; } static void raw_refresh_limits(BlockDriverState *bs, Error **errp) { BDRVRawState *s = bs->opaque; raw_probe_alignment(bs, s->fd, errp); bs->bl.min_mem_alignment = s->buf_align; bs->bl.opt_mem_alignment = MAX(s->buf_align, getpagesize()); } static int check_for_dasd(int fd) { #ifdef BIODASDINFO2 struct dasd_information2_t info = {0}; return ioctl(fd, BIODASDINFO2, &info); #else return -1; #endif } /** * Try to get @bs's logical and physical block size. * On success, store them in @bsz and return zero. * On failure, return negative errno. */ static int hdev_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) { BDRVRawState *s = bs->opaque; int ret; /* If DASD, get blocksizes */ if (check_for_dasd(s->fd) < 0) { return -ENOTSUP; } ret = probe_logical_blocksize(s->fd, &bsz->log); if (ret < 0) { return ret; } return probe_physical_blocksize(s->fd, &bsz->phys); } /** * Try to get @bs's geometry: cyls, heads, sectors. * On success, store them in @geo and return 0. * On failure return -errno. * (Allows block driver to assign default geometry values that guest sees) */ #ifdef __linux__ static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) { BDRVRawState *s = bs->opaque; struct hd_geometry ioctl_geo = {0}; /* If DASD, get its geometry */ if (check_for_dasd(s->fd) < 0) { return -ENOTSUP; } if (ioctl(s->fd, HDIO_GETGEO, &ioctl_geo) < 0) { return -errno; } /* HDIO_GETGEO may return success even though geo contains zeros (e.g. certain multipath setups) */ if (!ioctl_geo.heads || !ioctl_geo.sectors || !ioctl_geo.cylinders) { return -ENOTSUP; } /* Do not return a geometry for partition */ if (ioctl_geo.start != 0) { return -ENOTSUP; } geo->heads = ioctl_geo.heads; geo->sectors = ioctl_geo.sectors; geo->cylinders = ioctl_geo.cylinders; return 0; } #else /* __linux__ */ static int hdev_probe_geometry(BlockDriverState *bs, HDGeometry *geo) { return -ENOTSUP; } #endif static ssize_t handle_aiocb_ioctl(RawPosixAIOData *aiocb) { int ret; ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf); if (ret == -1) { return -errno; } return 0; } static ssize_t handle_aiocb_flush(RawPosixAIOData *aiocb) { int ret; ret = qemu_fdatasync(aiocb->aio_fildes); if (ret == -1) { return -errno; } return 0; } #ifdef CONFIG_PREADV static bool preadv_present = true; static ssize_t qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) { return preadv(fd, iov, nr_iov, offset); } static ssize_t qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) { return pwritev(fd, iov, nr_iov, offset); } #else static bool preadv_present = false; static ssize_t qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) { return -ENOSYS; } static ssize_t qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) { return -ENOSYS; } #endif static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb) { ssize_t len; do { if (aiocb->aio_type & QEMU_AIO_WRITE) len = qemu_pwritev(aiocb->aio_fildes, aiocb->aio_iov, aiocb->aio_niov, aiocb->aio_offset); else len = qemu_preadv(aiocb->aio_fildes, aiocb->aio_iov, aiocb->aio_niov, aiocb->aio_offset); } while (len == -1 && errno == EINTR); if (len == -1) { return -errno; } return len; } /* * Read/writes the data to/from a given linear buffer. * * Returns the number of bytes handles or -errno in case of an error. Short * reads are only returned if the end of the file is reached. */ static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf) { ssize_t offset = 0; ssize_t len; while (offset < aiocb->aio_nbytes) { if (aiocb->aio_type & QEMU_AIO_WRITE) { len = pwrite(aiocb->aio_fildes, (const char *)buf + offset, aiocb->aio_nbytes - offset, aiocb->aio_offset + offset); } else { len = pread(aiocb->aio_fildes, buf + offset, aiocb->aio_nbytes - offset, aiocb->aio_offset + offset); } if (len == -1 && errno == EINTR) { continue; } else if (len == -1 && errno == EINVAL && (aiocb->bs->open_flags & BDRV_O_NOCACHE) && !(aiocb->aio_type & QEMU_AIO_WRITE) && offset > 0) { /* O_DIRECT pread() may fail with EINVAL when offset is unaligned * after a short read. Assume that O_DIRECT short reads only occur * at EOF. Therefore this is a short read, not an I/O error. */ break; } else if (len == -1) { offset = -errno; break; } else if (len == 0) { break; } offset += len; } return offset; } static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb) { ssize_t nbytes; char *buf; if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) { /* * If there is just a single buffer, and it is properly aligned * we can just use plain pread/pwrite without any problems. */ if (aiocb->aio_niov == 1) { return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base); } /* * We have more than one iovec, and all are properly aligned. * * Try preadv/pwritev first and fall back to linearizing the * buffer if it's not supported. */ if (preadv_present) { nbytes = handle_aiocb_rw_vector(aiocb); if (nbytes == aiocb->aio_nbytes || (nbytes < 0 && nbytes != -ENOSYS)) { return nbytes; } preadv_present = false; } /* * XXX(hch): short read/write. no easy way to handle the reminder * using these interfaces. For now retry using plain * pread/pwrite? */ } /* * Ok, we have to do it the hard way, copy all segments into * a single aligned buffer. */ buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes); if (buf == NULL) { return -ENOMEM; } if (aiocb->aio_type & QEMU_AIO_WRITE) { char *p = buf; int i; for (i = 0; i < aiocb->aio_niov; ++i) { memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len); p += aiocb->aio_iov[i].iov_len; } assert(p - buf == aiocb->aio_nbytes); } nbytes = handle_aiocb_rw_linear(aiocb, buf); if (!(aiocb->aio_type & QEMU_AIO_WRITE)) { char *p = buf; size_t count = aiocb->aio_nbytes, copy; int i; for (i = 0; i < aiocb->aio_niov && count; ++i) { copy = count; if (copy > aiocb->aio_iov[i].iov_len) { copy = aiocb->aio_iov[i].iov_len; } memcpy(aiocb->aio_iov[i].iov_base, p, copy); assert(count >= copy); p += copy; count -= copy; } assert(count == 0); } qemu_vfree(buf); return nbytes; } #ifdef CONFIG_XFS static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes) { struct xfs_flock64 fl; int err; memset(&fl, 0, sizeof(fl)); fl.l_whence = SEEK_SET; fl.l_start = offset; fl.l_len = bytes; if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) { err = errno; DPRINTF("cannot write zero range (%s)\n", strerror(errno)); return -err; } return 0; } static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes) { struct xfs_flock64 fl; int err; memset(&fl, 0, sizeof(fl)); fl.l_whence = SEEK_SET; fl.l_start = offset; fl.l_len = bytes; if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) { err = errno; DPRINTF("cannot punch hole (%s)\n", strerror(errno)); return -err; } return 0; } #endif static int translate_err(int err) { if (err == -ENODEV || err == -ENOSYS || err == -EOPNOTSUPP || err == -ENOTTY) { err = -ENOTSUP; } return err; } #ifdef CONFIG_FALLOCATE static int do_fallocate(int fd, int mode, off_t offset, off_t len) { do { if (fallocate(fd, mode, offset, len) == 0) { return 0; } } while (errno == EINTR); return translate_err(-errno); } #endif static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb) { int ret = -ENOTSUP; BDRVRawState *s = aiocb->bs->opaque; if (!s->has_write_zeroes) { return -ENOTSUP; } #ifdef BLKZEROOUT do { uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; if (ioctl(aiocb->aio_fildes, BLKZEROOUT, range) == 0) { return 0; } } while (errno == EINTR); ret = translate_err(-errno); #endif if (ret == -ENOTSUP) { s->has_write_zeroes = false; } return ret; } static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb) { #if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS) BDRVRawState *s = aiocb->bs->opaque; #endif if (aiocb->aio_type & QEMU_AIO_BLKDEV) { return handle_aiocb_write_zeroes_block(aiocb); } #ifdef CONFIG_XFS if (s->is_xfs) { return xfs_write_zeroes(s, aiocb->aio_offset, aiocb->aio_nbytes); } #endif #ifdef CONFIG_FALLOCATE_ZERO_RANGE if (s->has_write_zeroes) { int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE, aiocb->aio_offset, aiocb->aio_nbytes); if (ret == 0 || ret != -ENOTSUP) { return ret; } s->has_write_zeroes = false; } #endif #ifdef CONFIG_FALLOCATE_PUNCH_HOLE if (s->has_discard && s->has_fallocate) { int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, aiocb->aio_offset, aiocb->aio_nbytes); if (ret == 0) { ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); if (ret == 0 || ret != -ENOTSUP) { return ret; } s->has_fallocate = false; } else if (ret != -ENOTSUP) { return ret; } else { s->has_discard = false; } } #endif #ifdef CONFIG_FALLOCATE if (s->has_fallocate && aiocb->aio_offset >= bdrv_getlength(aiocb->bs)) { int ret = do_fallocate(s->fd, 0, aiocb->aio_offset, aiocb->aio_nbytes); if (ret == 0 || ret != -ENOTSUP) { return ret; } s->has_fallocate = false; } #endif return -ENOTSUP; } static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb) { int ret = -EOPNOTSUPP; BDRVRawState *s = aiocb->bs->opaque; if (!s->has_discard) { return -ENOTSUP; } if (aiocb->aio_type & QEMU_AIO_BLKDEV) { #ifdef BLKDISCARD do { uint64_t range[2] = { aiocb->aio_offset, aiocb->aio_nbytes }; if (ioctl(aiocb->aio_fildes, BLKDISCARD, range) == 0) { return 0; } } while (errno == EINTR); ret = -errno; #endif } else { #ifdef CONFIG_XFS if (s->is_xfs) { return xfs_discard(s, aiocb->aio_offset, aiocb->aio_nbytes); } #endif #ifdef CONFIG_FALLOCATE_PUNCH_HOLE ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, aiocb->aio_offset, aiocb->aio_nbytes); #endif } ret = translate_err(ret); if (ret == -ENOTSUP) { s->has_discard = false; } return ret; } static int aio_worker(void *arg) { RawPosixAIOData *aiocb = arg; ssize_t ret = 0; switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) { case QEMU_AIO_READ: ret = handle_aiocb_rw(aiocb); if (ret >= 0 && ret < aiocb->aio_nbytes) { iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret, 0, aiocb->aio_nbytes - ret); ret = aiocb->aio_nbytes; } if (ret == aiocb->aio_nbytes) { ret = 0; } else if (ret >= 0 && ret < aiocb->aio_nbytes) { ret = -EINVAL; } break; case QEMU_AIO_WRITE: ret = handle_aiocb_rw(aiocb); if (ret == aiocb->aio_nbytes) { ret = 0; } else if (ret >= 0 && ret < aiocb->aio_nbytes) { ret = -EINVAL; } break; case QEMU_AIO_FLUSH: ret = handle_aiocb_flush(aiocb); break; case QEMU_AIO_IOCTL: ret = handle_aiocb_ioctl(aiocb); break; case QEMU_AIO_DISCARD: ret = handle_aiocb_discard(aiocb); break; case QEMU_AIO_WRITE_ZEROES: ret = handle_aiocb_write_zeroes(aiocb); break; default: fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type); ret = -EINVAL; break; } g_free(aiocb); return ret; } static int paio_submit_co(BlockDriverState *bs, int fd, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, int type) { RawPosixAIOData *acb = g_new(RawPosixAIOData, 1); ThreadPool *pool; acb->bs = bs; acb->aio_type = type; acb->aio_fildes = fd; acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE; acb->aio_offset = sector_num * BDRV_SECTOR_SIZE; if (qiov) { acb->aio_iov = qiov->iov; acb->aio_niov = qiov->niov; assert(qiov->size == acb->aio_nbytes); } trace_paio_submit_co(sector_num, nb_sectors, type); pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); return thread_pool_submit_co(pool, aio_worker, acb); } static BlockAIOCB *paio_submit(BlockDriverState *bs, int fd, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockCompletionFunc *cb, void *opaque, int type) { RawPosixAIOData *acb = g_new(RawPosixAIOData, 1); ThreadPool *pool; acb->bs = bs; acb->aio_type = type; acb->aio_fildes = fd; acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE; acb->aio_offset = sector_num * BDRV_SECTOR_SIZE; if (qiov) { acb->aio_iov = qiov->iov; acb->aio_niov = qiov->niov; assert(qiov->size == acb->aio_nbytes); } trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque); } static BlockAIOCB *raw_aio_submit(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockCompletionFunc *cb, void *opaque, int type) { BDRVRawState *s = bs->opaque; if (fd_open(bs) < 0) return NULL; /* * Check if the underlying device requires requests to be aligned, * and if the request we are trying to submit is aligned or not. * If this is the case tell the low-level driver that it needs * to copy the buffer. */ if (s->needs_alignment) { if (!bdrv_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 void raw_aio_plug(BlockDriverState *bs) { #ifdef CONFIG_LINUX_AIO BDRVRawState *s = bs->opaque; if (s->use_aio) { laio_io_plug(bs, s->aio_ctx); } #endif } static void raw_aio_unplug(BlockDriverState *bs) { #ifdef CONFIG_LINUX_AIO BDRVRawState *s = bs->opaque; if (s->use_aio) { laio_io_unplug(bs, s->aio_ctx, true); } #endif } static void raw_aio_flush_io_queue(BlockDriverState *bs) { #ifdef CONFIG_LINUX_AIO BDRVRawState *s = bs->opaque; if (s->use_aio) { laio_io_unplug(bs, s->aio_ctx, false); } #endif } static BlockAIOCB *raw_aio_readv(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockCompletionFunc *cb, void *opaque) { return raw_aio_submit(bs, sector_num, qiov, nb_sectors, cb, opaque, QEMU_AIO_READ); } static BlockAIOCB *raw_aio_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockCompletionFunc *cb, void *opaque) { return raw_aio_submit(bs, sector_num, qiov, nb_sectors, cb, opaque, QEMU_AIO_WRITE); } static BlockAIOCB *raw_aio_flush(BlockDriverState *bs, BlockCompletionFunc *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; raw_detach_aio_context(bs); #ifdef CONFIG_LINUX_AIO if (s->use_aio) { laio_cleanup(s->aio_ctx); } #endif if (s->fd >= 0) { qemu_close(s->fd); s->fd = -1; } } static int raw_truncate(BlockDriverState *bs, int64_t offset) { BDRVRawState *s = bs->opaque; struct stat st; if (fstat(s->fd, &st)) { return -errno; } if (S_ISREG(st.st_mode)) { if (ftruncate(s->fd, offset) < 0) { return -errno; } } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { if (offset > raw_getlength(bs)) { return -EINVAL; } } else { return -ENOTSUP; } 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 -errno; if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { struct disklabel dl; if (ioctl(fd, DIOCGDINFO, &dl)) return -errno; return (uint64_t)dl.d_secsize * dl.d_partitions[DISKPART(st.st_rdev)].p_size; } else return st.st_size; } #elif defined(__NetBSD__) static int64_t raw_getlength(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int fd = s->fd; struct stat st; if (fstat(fd, &st)) return -errno; if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { struct dkwedge_info dkw; if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) { return dkw.dkw_size * 512; } else { struct disklabel dl; if (ioctl(fd, DIOCGDINFO, &dl)) return -errno; 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; int64_t size; 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. */ size = lseek(s->fd, 0, SEEK_END); if (size < 0) { return -errno; } return size; } #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 #if defined(__APPLE__) && defined(__MACH__) { uint64_t sectors = 0; uint32_t sector_size = 0; if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0 && ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) { size = sectors * sector_size; } else { size = lseek(fd, 0LL, SEEK_END); if (size < 0) { return -errno; } } } #else size = lseek(fd, 0LL, SEEK_END); if (size < 0) { return -errno; } #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); if (size < 0) { return -errno; } } return size; } #else static int64_t raw_getlength(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int ret; int64_t size; ret = fd_open(bs); if (ret < 0) { return ret; } size = lseek(s->fd, 0, SEEK_END); if (size < 0) { return -errno; } return size; } #endif static int64_t raw_get_allocated_file_size(BlockDriverState *bs) { struct stat st; BDRVRawState *s = bs->opaque; if (fstat(s->fd, &st) < 0) { return -errno; } return (int64_t)st.st_blocks * 512; } static int raw_create(const char *filename, QemuOpts *opts, Error **errp) { int fd; int result = 0; int64_t total_size = 0; bool nocow = false; PreallocMode prealloc; char *buf = NULL; Error *local_err = NULL; strstart(filename, "file:", &filename); /* Read out options */ total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), BDRV_SECTOR_SIZE); nocow = qemu_opt_get_bool(opts, BLOCK_OPT_NOCOW, false); buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); prealloc = qapi_enum_parse(PreallocMode_lookup, buf, PREALLOC_MODE__MAX, PREALLOC_MODE_OFF, &local_err); g_free(buf); if (local_err) { error_propagate(errp, local_err); result = -EINVAL; goto out; } fd = qemu_open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0644); if (fd < 0) { result = -errno; error_setg_errno(errp, -result, "Could not create file"); goto out; } if (nocow) { #ifdef __linux__ /* Set NOCOW flag to solve performance issue on fs like btrfs. * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value * will be ignored since any failure of this operation should not * block the left work. */ int attr; if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0) { attr |= FS_NOCOW_FL; ioctl(fd, FS_IOC_SETFLAGS, &attr); } #endif } if (ftruncate(fd, total_size) != 0) { result = -errno; error_setg_errno(errp, -result, "Could not resize file"); goto out_close; } switch (prealloc) { #ifdef CONFIG_POSIX_FALLOCATE case PREALLOC_MODE_FALLOC: /* posix_fallocate() doesn't set errno. */ result = -posix_fallocate(fd, 0, total_size); if (result != 0) { error_setg_errno(errp, -result, "Could not preallocate data for the new file"); } break; #endif case PREALLOC_MODE_FULL: { int64_t num = 0, left = total_size; buf = g_malloc0(65536); while (left > 0) { num = MIN(left, 65536); result = write(fd, buf, num); if (result < 0) { result = -errno; error_setg_errno(errp, -result, "Could not write to the new file"); break; } left -= result; } if (result >= 0) { result = fsync(fd); if (result < 0) { result = -errno; error_setg_errno(errp, -result, "Could not flush new file to disk"); } } g_free(buf); break; } case PREALLOC_MODE_OFF: break; default: result = -EINVAL; error_setg(errp, "Unsupported preallocation mode: %s", PreallocMode_lookup[prealloc]); break; } out_close: if (qemu_close(fd) != 0 && result == 0) { result = -errno; error_setg_errno(errp, -result, "Could not close the new file"); } out: return result; } /* * Find allocation range in @bs around offset @start. * May change underlying file descriptor's file offset. * If @start is not in a hole, store @start in @data, and the * beginning of the next hole in @hole, and return 0. * If @start is in a non-trailing hole, store @start in @hole and the * beginning of the next non-hole in @data, and return 0. * If @start is in a trailing hole or beyond EOF, return -ENXIO. * If we can't find out, return a negative errno other than -ENXIO. */ static int find_allocation(BlockDriverState *bs, off_t start, off_t *data, off_t *hole) { #if defined SEEK_HOLE && defined SEEK_DATA BDRVRawState *s = bs->opaque; off_t offs; /* * SEEK_DATA cases: * D1. offs == start: start is in data * D2. offs > start: start is in a hole, next data at offs * D3. offs < 0, errno = ENXIO: either start is in a trailing hole * or start is beyond EOF * If the latter happens, the file has been truncated behind * our back since we opened it. All bets are off then. * Treating like a trailing hole is simplest. * D4. offs < 0, errno != ENXIO: we learned nothing */ offs = lseek(s->fd, start, SEEK_DATA); if (offs < 0) { return -errno; /* D3 or D4 */ } assert(offs >= start); if (offs > start) { /* D2: in hole, next data at offs */ *hole = start; *data = offs; return 0; } /* D1: in data, end not yet known */ /* * SEEK_HOLE cases: * H1. offs == start: start is in a hole * If this happens here, a hole has been dug behind our back * since the previous lseek(). * H2. offs > start: either start is in data, next hole at offs, * or start is in trailing hole, EOF at offs * Linux treats trailing holes like any other hole: offs == * start. Solaris seeks to EOF instead: offs > start (blech). * If that happens here, a hole has been dug behind our back * since the previous lseek(). * H3. offs < 0, errno = ENXIO: start is beyond EOF * If this happens, the file has been truncated behind our * back since we opened it. Treat it like a trailing hole. * H4. offs < 0, errno != ENXIO: we learned nothing * Pretend we know nothing at all, i.e. "forget" about D1. */ offs = lseek(s->fd, start, SEEK_HOLE); if (offs < 0) { return -errno; /* D1 and (H3 or H4) */ } assert(offs >= start); if (offs > start) { /* * D1 and H2: either in data, next hole at offs, or it was in * data but is now in a trailing hole. In the latter case, * all bets are off. Treating it as if it there was data all * the way to EOF is safe, so simply do that. */ *data = start; *hole = offs; return 0; } /* D1 and H1 */ return -EBUSY; #else return -ENOTSUP; #endif } /* * Returns the allocation status of the specified sectors. * * If 'sector_num' is beyond the end of the disk image the return value is 0 * and 'pnum' is set to 0. * * '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. If nb_sectors goes * beyond the end of the disk image it will be clamped. */ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) { off_t start, data = 0, hole = 0; int64_t total_size; int ret; ret = fd_open(bs); if (ret < 0) { return ret; } start = sector_num * BDRV_SECTOR_SIZE; total_size = bdrv_getlength(bs); if (total_size < 0) { return total_size; } else if (start >= total_size) { *pnum = 0; return 0; } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) { nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE); } ret = find_allocation(bs, start, &data, &hole); if (ret == -ENXIO) { /* Trailing hole */ *pnum = nb_sectors; ret = BDRV_BLOCK_ZERO; } else if (ret < 0) { /* No info available, so pretend there are no holes */ *pnum = nb_sectors; ret = BDRV_BLOCK_DATA; } else if (data == start) { /* On a data extent, compute sectors to the end of the extent, * possibly including a partial sector at EOF. */ *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE)); ret = BDRV_BLOCK_DATA; } else { /* On a hole, compute sectors to the beginning of the next extent. */ assert(hole == start); *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE); ret = BDRV_BLOCK_ZERO; } return ret | BDRV_BLOCK_OFFSET_VALID | start; } static coroutine_fn BlockAIOCB *raw_aio_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BlockCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors, cb, opaque, QEMU_AIO_DISCARD); } static int coroutine_fn raw_co_write_zeroes( BlockDriverState *bs, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) { BDRVRawState *s = bs->opaque; if (!(flags & BDRV_REQ_MAY_UNMAP)) { return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors, QEMU_AIO_WRITE_ZEROES); } else if (s->discard_zeroes) { return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors, QEMU_AIO_DISCARD); } return -ENOTSUP; } static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) { BDRVRawState *s = bs->opaque; bdi->unallocated_blocks_are_zero = s->discard_zeroes; bdi->can_write_zeroes_with_unmap = s->discard_zeroes; return 0; } static QemuOptsList raw_create_opts = { .name = "raw-create-opts", .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), .desc = { { .name = BLOCK_OPT_SIZE, .type = QEMU_OPT_SIZE, .help = "Virtual disk size" }, { .name = BLOCK_OPT_NOCOW, .type = QEMU_OPT_BOOL, .help = "Turn off copy-on-write (valid only on btrfs)" }, { .name = BLOCK_OPT_PREALLOC, .type = QEMU_OPT_STRING, .help = "Preallocation mode (allowed values: off, falloc, full)" }, { /* end of list */ } } }; BlockDriver bdrv_file = { .format_name = "file", .protocol_name = "file", .instance_size = sizeof(BDRVRawState), .bdrv_needs_filename = true, .bdrv_probe = NULL, /* no probe for protocols */ .bdrv_parse_filename = raw_parse_filename, .bdrv_file_open = raw_open, .bdrv_reopen_prepare = raw_reopen_prepare, .bdrv_reopen_commit = raw_reopen_commit, .bdrv_reopen_abort = raw_reopen_abort, .bdrv_close = raw_close, .bdrv_create = raw_create, .bdrv_has_zero_init = bdrv_has_zero_init_1, .bdrv_co_get_block_status = raw_co_get_block_status, .bdrv_co_write_zeroes = raw_co_write_zeroes, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_aio_discard = raw_aio_discard, .bdrv_refresh_limits = raw_refresh_limits, .bdrv_io_plug = raw_aio_plug, .bdrv_io_unplug = raw_aio_unplug, .bdrv_flush_io_queue = raw_aio_flush_io_queue, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .bdrv_get_info = raw_get_info, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, .bdrv_detach_aio_context = raw_detach_aio_context, .bdrv_attach_aio_context = raw_attach_aio_context, .create_opts = &raw_create_opts, }; /***********************************************/ /* host device */ #if defined(__APPLE__) && defined(__MACH__) static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ); static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize, int flags); 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, int flags) { 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 ); if (flags & BDRV_O_NOCACHE) { 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 check_hdev_writable(BDRVRawState *s) { #if defined(BLKROGET) /* Linux block devices can be configured "read-only" using blockdev(8). * This is independent of device node permissions and therefore open(2) * with O_RDWR succeeds. Actual writes fail with EPERM. * * bdrv_open() is supposed to fail if the disk is read-only. Explicitly * check for read-only block devices so that Linux block devices behave * properly. */ struct stat st; int readonly = 0; if (fstat(s->fd, &st)) { return -errno; } if (!S_ISBLK(st.st_mode)) { return 0; } if (ioctl(s->fd, BLKROGET, &readonly) < 0) { return -errno; } if (readonly) { return -EACCES; } #endif /* defined(BLKROGET) */ return 0; } static void hdev_parse_filename(const char *filename, QDict *options, Error **errp) { /* The prefix is optional, just as for "file". */ strstart(filename, "host_device:", &filename); qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename))); } static bool hdev_is_sg(BlockDriverState *bs) { #if defined(__linux__) struct stat st; struct sg_scsi_id scsiid; int sg_version; if (stat(bs->filename, &st) >= 0 && S_ISCHR(st.st_mode) && !bdrv_ioctl(bs, SG_GET_VERSION_NUM, &sg_version) && !bdrv_ioctl(bs, SG_GET_SCSI_ID, &scsiid)) { DPRINTF("SG device found: type=%d, version=%d\n", scsiid.scsi_type, sg_version); return true; } #endif return false; } static int hdev_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVRawState *s = bs->opaque; Error *local_err = NULL; int ret; #if defined(__APPLE__) && defined(__MACH__) const char *filename = qdict_get_str(options, "filename"); 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), flags); if ( bsdPath[ 0 ] != '\0' ) { strcat(bsdPath,"s0"); /* some CDs don't have a partition 0 */ fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE); if (fd < 0) { bsdPath[strlen(bsdPath)-1] = '1'; } else { qemu_close(fd); } filename = bsdPath; qdict_put(options, "filename", qstring_from_str(filename)); } if ( mediaIterator ) IOObjectRelease( mediaIterator ); } #endif s->type = FTYPE_FILE; ret = raw_open_common(bs, options, flags, 0, &local_err); if (ret < 0) { if (local_err) { error_propagate(errp, local_err); } return ret; } /* Since this does ioctl the device must be already opened */ bs->sg = hdev_is_sg(bs); if (flags & BDRV_O_RDWR) { ret = check_hdev_writable(s); if (ret < 0) { raw_close(bs); error_setg_errno(errp, -ret, "The device is not writable"); return ret; } } return ret; } #if defined(__linux__) static BlockAIOCB *hdev_aio_ioctl(BlockDriverState *bs, unsigned long int req, void *buf, BlockCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; RawPosixAIOData *acb; ThreadPool *pool; if (fd_open(bs) < 0) return NULL; acb = g_new(RawPosixAIOData, 1); acb->bs = bs; acb->aio_type = QEMU_AIO_IOCTL; acb->aio_fildes = s->fd; acb->aio_offset = 0; acb->aio_ioctl_buf = buf; acb->aio_ioctl_cmd = req; pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque); } #endif /* linux */ 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; } static coroutine_fn BlockAIOCB *hdev_aio_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BlockCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; if (fd_open(bs) < 0) { return NULL; } return paio_submit(bs, s->fd, sector_num, NULL, nb_sectors, cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV); } static coroutine_fn int hdev_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) { BDRVRawState *s = bs->opaque; int rc; rc = fd_open(bs); if (rc < 0) { return rc; } if (!(flags & BDRV_REQ_MAY_UNMAP)) { return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors, QEMU_AIO_WRITE_ZEROES|QEMU_AIO_BLKDEV); } else if (s->discard_zeroes) { return paio_submit_co(bs, s->fd, sector_num, NULL, nb_sectors, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV); } return -ENOTSUP; } static int hdev_create(const char *filename, QemuOpts *opts, Error **errp) { int fd; int ret = 0; struct stat stat_buf; int64_t total_size = 0; bool has_prefix; /* This function is used by both protocol block drivers and therefore either * of these prefixes may be given. * The return value has to be stored somewhere, otherwise this is an error * due to -Werror=unused-value. */ has_prefix = strstart(filename, "host_device:", &filename) || strstart(filename, "host_cdrom:" , &filename); (void)has_prefix; ret = raw_normalize_devicepath(&filename); if (ret < 0) { error_setg_errno(errp, -ret, "Could not normalize device path"); return ret; } /* Read out options */ total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), BDRV_SECTOR_SIZE); fd = qemu_open(filename, O_WRONLY | O_BINARY); if (fd < 0) { ret = -errno; error_setg_errno(errp, -ret, "Could not open device"); return ret; } if (fstat(fd, &stat_buf) < 0) { ret = -errno; error_setg_errno(errp, -ret, "Could not stat device"); } else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode)) { error_setg(errp, "The given file is neither a block nor a character device"); ret = -ENODEV; } else if (lseek(fd, 0, SEEK_END) < total_size) { error_setg(errp, "Device is too small"); ret = -ENOSPC; } qemu_close(fd); return ret; } static BlockDriver bdrv_host_device = { .format_name = "host_device", .protocol_name = "host_device", .instance_size = sizeof(BDRVRawState), .bdrv_needs_filename = true, .bdrv_probe_device = hdev_probe_device, .bdrv_parse_filename = hdev_parse_filename, .bdrv_file_open = hdev_open, .bdrv_close = raw_close, .bdrv_reopen_prepare = raw_reopen_prepare, .bdrv_reopen_commit = raw_reopen_commit, .bdrv_reopen_abort = raw_reopen_abort, .bdrv_create = hdev_create, .create_opts = &raw_create_opts, .bdrv_co_write_zeroes = hdev_co_write_zeroes, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_aio_discard = hdev_aio_discard, .bdrv_refresh_limits = raw_refresh_limits, .bdrv_io_plug = raw_aio_plug, .bdrv_io_unplug = raw_aio_unplug, .bdrv_flush_io_queue = raw_aio_flush_io_queue, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .bdrv_get_info = raw_get_info, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, .bdrv_probe_blocksizes = hdev_probe_blocksizes, .bdrv_probe_geometry = hdev_probe_geometry, .bdrv_detach_aio_context = raw_detach_aio_context, .bdrv_attach_aio_context = raw_attach_aio_context, /* generic scsi device */ #ifdef __linux__ .bdrv_aio_ioctl = hdev_aio_ioctl, #endif }; #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) static void cdrom_parse_filename(const char *filename, QDict *options, Error **errp) { /* The prefix is optional, just as for "file". */ strstart(filename, "host_cdrom:", &filename); qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename))); } #endif #ifdef __linux__ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVRawState *s = bs->opaque; Error *local_err = NULL; int ret; s->type = FTYPE_CD; /* open will not fail even if no CD is inserted, so add O_NONBLOCK */ ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err); if (local_err) { error_propagate(errp, local_err); } return ret; } static int cdrom_probe_device(const char *filename) { int fd, ret; int prio = 0; struct stat st; fd = qemu_open(filename, O_RDONLY | O_NONBLOCK); if (fd < 0) { goto out; } ret = fstat(fd, &st); if (ret == -1 || !S_ISBLK(st.st_mode)) { goto outc; } /* Attempt to detect via a CDROM specific ioctl */ ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); if (ret >= 0) prio = 100; outc: qemu_close(fd); out: return prio; } static bool cdrom_is_inserted(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; int ret; ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT); return ret == CDS_DISC_OK; } static void cdrom_eject(BlockDriverState *bs, bool 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"); } } static void cdrom_lock_medium(BlockDriverState *bs, bool 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"); */ } } static BlockDriver bdrv_host_cdrom = { .format_name = "host_cdrom", .protocol_name = "host_cdrom", .instance_size = sizeof(BDRVRawState), .bdrv_needs_filename = true, .bdrv_probe_device = cdrom_probe_device, .bdrv_parse_filename = cdrom_parse_filename, .bdrv_file_open = cdrom_open, .bdrv_close = raw_close, .bdrv_reopen_prepare = raw_reopen_prepare, .bdrv_reopen_commit = raw_reopen_commit, .bdrv_reopen_abort = raw_reopen_abort, .bdrv_create = hdev_create, .create_opts = &raw_create_opts, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_refresh_limits = raw_refresh_limits, .bdrv_io_plug = raw_aio_plug, .bdrv_io_unplug = raw_aio_unplug, .bdrv_flush_io_queue = raw_aio_flush_io_queue, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .has_variable_length = true, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, .bdrv_detach_aio_context = raw_detach_aio_context, .bdrv_attach_aio_context = raw_attach_aio_context, /* removable device support */ .bdrv_is_inserted = cdrom_is_inserted, .bdrv_eject = cdrom_eject, .bdrv_lock_medium = cdrom_lock_medium, /* generic scsi device */ .bdrv_aio_ioctl = hdev_aio_ioctl, }; #endif /* __linux__ */ #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVRawState *s = bs->opaque; Error *local_err = NULL; int ret; s->type = FTYPE_CD; ret = raw_open_common(bs, options, flags, 0, &local_err); if (ret) { if (local_err) { error_propagate(errp, local_err); } return ret; } /* make sure the door isn't 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) qemu_close(s->fd); fd = qemu_open(bs->filename, s->open_flags, 0644); if (fd < 0) { s->fd = -1; return -EIO; } s->fd = fd; /* make sure the door isn't locked at this time */ ioctl(s->fd, CDIOCALLOW); return 0; } static bool cdrom_is_inserted(BlockDriverState *bs) { return raw_getlength(bs) > 0; } static void cdrom_eject(BlockDriverState *bs, bool eject_flag) { BDRVRawState *s = bs->opaque; if (s->fd < 0) return; (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"); } cdrom_reopen(bs); } static void cdrom_lock_medium(BlockDriverState *bs, bool locked) { BDRVRawState *s = bs->opaque; if (s->fd < 0) return; if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) { /* * Note: an error can happen if the distribution automatically * mounts the CD-ROM */ /* perror("CDROM_LOCKDOOR"); */ } } static BlockDriver bdrv_host_cdrom = { .format_name = "host_cdrom", .protocol_name = "host_cdrom", .instance_size = sizeof(BDRVRawState), .bdrv_needs_filename = true, .bdrv_probe_device = cdrom_probe_device, .bdrv_parse_filename = cdrom_parse_filename, .bdrv_file_open = cdrom_open, .bdrv_close = raw_close, .bdrv_reopen_prepare = raw_reopen_prepare, .bdrv_reopen_commit = raw_reopen_commit, .bdrv_reopen_abort = raw_reopen_abort, .bdrv_create = hdev_create, .create_opts = &raw_create_opts, .bdrv_aio_readv = raw_aio_readv, .bdrv_aio_writev = raw_aio_writev, .bdrv_aio_flush = raw_aio_flush, .bdrv_refresh_limits = raw_refresh_limits, .bdrv_io_plug = raw_aio_plug, .bdrv_io_unplug = raw_aio_unplug, .bdrv_flush_io_queue = raw_aio_flush_io_queue, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .has_variable_length = true, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, .bdrv_detach_aio_context = raw_detach_aio_context, .bdrv_attach_aio_context = raw_attach_aio_context, /* removable device support */ .bdrv_is_inserted = cdrom_is_inserted, .bdrv_eject = cdrom_eject, .bdrv_lock_medium = cdrom_lock_medium, }; #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_cdrom); #endif #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) bdrv_register(&bdrv_host_cdrom); #endif } block_init(bdrv_file_init);