| /* |
| * 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/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" |
| |
| #if defined(__APPLE__) && (__MACH__) |
| #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 |
| |
| #ifdef __sun__ |
| #define _POSIX_PTHREAD_SEMANTICS 1 |
| #include <sys/dkio.h> |
| #endif |
| #ifdef __linux__ |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <sys/param.h> |
| #include <linux/cdrom.h> |
| #include <linux/fd.h> |
| #include <linux/fs.h> |
| #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 <linux/falloc.h> |
| #endif |
| #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) |
| #include <sys/disk.h> |
| #include <sys/cdio.h> |
| #endif |
| |
| #ifdef __OpenBSD__ |
| #include <sys/ioctl.h> |
| #include <sys/disklabel.h> |
| #include <sys/dkio.h> |
| #endif |
| |
| #ifdef __NetBSD__ |
| #include <sys/ioctl.h> |
| #include <sys/disklabel.h> |
| #include <sys/dkio.h> |
| #include <sys/disk.h> |
| #endif |
| |
| #ifdef __DragonFly__ |
| #include <sys/ioctl.h> |
| #include <sys/diskslice.h> |
| #endif |
| |
| #ifdef CONFIG_XFS |
| #include <xfs/xfs.h> |
| #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; |
| size_t buf_align; |
| |
| #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 |
| #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 |
| |
| static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| char *buf; |
| unsigned int sector_size; |
| |
| /* For /dev/sg devices the alignment is not really used. |
| With buffered I/O, we don't have any restrictions. */ |
| if (bs->sg || !s->needs_alignment) { |
| bs->request_alignment = 1; |
| s->buf_align = 1; |
| return; |
| } |
| |
| /* Try a few ioctls to get the right size */ |
| bs->request_alignment = 0; |
| s->buf_align = 0; |
| |
| #ifdef BLKSSZGET |
| if (ioctl(fd, BLKSSZGET, §or_size) >= 0) { |
| bs->request_alignment = sector_size; |
| } |
| #endif |
| #ifdef DKIOCGETBLOCKSIZE |
| if (ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) >= 0) { |
| bs->request_alignment = sector_size; |
| } |
| #endif |
| #ifdef DIOCGSECTORSIZE |
| if (ioctl(fd, DIOCGSECTORSIZE, §or_size) >= 0) { |
| bs->request_alignment = sector_size; |
| } |
| #endif |
| #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_BLOCKSIZE, 2 * MAX_BLOCKSIZE); |
| for (align = 512; align <= MAX_BLOCKSIZE; align <<= 1) { |
| if (pread(fd, buf + align, MAX_BLOCKSIZE, 0) >= 0) { |
| s->buf_align = align; |
| break; |
| } |
| } |
| qemu_vfree(buf); |
| } |
| |
| if (!bs->request_alignment) { |
| size_t align; |
| buf = qemu_memalign(s->buf_align, MAX_BLOCKSIZE); |
| for (align = 512; align <= MAX_BLOCKSIZE; align <<= 1) { |
| if (pread(fd, buf, align, 0) >= 0) { |
| 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; |
| } |
| #endif |
| |
| 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_FD || 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) { |
| assert(!(raw_s->open_flags & O_CREAT)); |
| raw_s->fd = qemu_open(state->bs->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.opt_mem_alignment = s->buf_align; |
| } |
| |
| 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; |
| |
| 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) { |
| DEBUG_BLOCK_PRINT("cannot write zero range (%s)\n", strerror(errno)); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes) |
| { |
| struct xfs_flock64 fl; |
| |
| 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) { |
| DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno)); |
| return -errno; |
| } |
| |
| 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) |
| { |
| BDRVRawState *s = aiocb->bs->opaque; |
| |
| 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 && aiocb->bs->growable) { |
| 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_slice_free(RawPosixAIOData, 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_slice_new(RawPosixAIOData); |
| 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_slice_new(RawPosixAIOData); |
| 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_WRONLY | 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) |
| { |
| 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. */ |
| *pnum = MIN(nb_sectors, (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 ); |
| |
| 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 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 int hdev_open(BlockDriverState *bs, QDict *options, int flags, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| Error *local_err = NULL; |
| int ret; |
| const char *filename = qdict_get_str(options, "filename"); |
| |
| #if defined(__APPLE__) && defined(__MACH__) |
| 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 = 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; |
| #if defined(__linux__) |
| { |
| char resolved_path[ MAXPATHLEN ], *temp; |
| |
| temp = realpath(filename, resolved_path); |
| if (temp && strstart(temp, "/dev/sg", NULL)) { |
| bs->sg = 1; |
| } |
| } |
| #endif |
| |
| ret = raw_open_common(bs, options, flags, 0, &local_err); |
| if (ret < 0) { |
| if (local_err) { |
| error_propagate(errp, local_err); |
| } |
| return ret; |
| } |
| |
| 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__) |
| /* 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 && |
| (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->fd_open_time) >= FD_OPEN_TIMEOUT) { |
| qemu_close(s->fd); |
| s->fd = -1; |
| #ifdef DEBUG_FLOPPY |
| printf("Floppy closed\n"); |
| #endif |
| } |
| if (s->fd < 0) { |
| if (s->fd_got_error && |
| (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->fd_error_time) < FD_OPEN_TIMEOUT) { |
| #ifdef DEBUG_FLOPPY |
| printf("No floppy (open delayed)\n"); |
| #endif |
| return -EIO; |
| } |
| s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK); |
| if (s->fd < 0) { |
| s->fd_error_time = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
| 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 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); |
| 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 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_slice_new(RawPosixAIOData); |
| 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); |
| } |
| |
| #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 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 all three protocol block drivers and therefore |
| * any of these three 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) || |
| strstart(filename, "host_floppy:", &filename); |
| |
| (void)has_prefix; |
| |
| /* 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_detach_aio_context = raw_detach_aio_context, |
| .bdrv_attach_aio_context = raw_attach_aio_context, |
| |
| /* generic scsi device */ |
| #ifdef __linux__ |
| .bdrv_ioctl = hdev_ioctl, |
| .bdrv_aio_ioctl = hdev_aio_ioctl, |
| #endif |
| }; |
| |
| #ifdef __linux__ |
| static void floppy_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| /* The prefix is optional, just as for "file". */ |
| strstart(filename, "host_floppy:", &filename); |
| |
| qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename))); |
| } |
| |
| static int floppy_open(BlockDriverState *bs, QDict *options, int flags, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| Error *local_err = NULL; |
| 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, options, flags, O_NONBLOCK, &local_err); |
| if (ret) { |
| if (local_err) { |
| error_propagate(errp, local_err); |
| } |
| return ret; |
| } |
| |
| /* close fd so that we can reopen it as needed */ |
| qemu_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; |
| struct stat st; |
| |
| if (strstart(filename, "/dev/fd", NULL) && |
| !strstart(filename, "/dev/fdset/", NULL)) { |
| prio = 50; |
| } |
| |
| 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 floppy specific ioctl */ |
| ret = ioctl(fd, FDGETPRM, &fdparam); |
| if (ret >= 0) |
| prio = 100; |
| |
| outc: |
| qemu_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 void floppy_eject(BlockDriverState *bs, bool eject_flag) |
| { |
| BDRVRawState *s = bs->opaque; |
| int fd; |
| |
| if (s->fd >= 0) { |
| qemu_close(s->fd); |
| s->fd = -1; |
| } |
| fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK); |
| if (fd >= 0) { |
| if (ioctl(fd, FDEJECT, 0) < 0) |
| perror("FDEJECT"); |
| qemu_close(fd); |
| } |
| } |
| |
| static BlockDriver bdrv_host_floppy = { |
| .format_name = "host_floppy", |
| .protocol_name = "host_floppy", |
| .instance_size = sizeof(BDRVRawState), |
| .bdrv_needs_filename = true, |
| .bdrv_probe_device = floppy_probe_device, |
| .bdrv_parse_filename = floppy_parse_filename, |
| .bdrv_file_open = floppy_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 = floppy_is_inserted, |
| .bdrv_media_changed = floppy_media_changed, |
| .bdrv_eject = floppy_eject, |
| }; |
| #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 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 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_ioctl = hdev_ioctl, |
| .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 int 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_floppy); |
| bdrv_register(&bdrv_host_cdrom); |
| #endif |
| #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) |
| bdrv_register(&bdrv_host_cdrom); |
| #endif |
| } |
| |
| block_init(bdrv_file_init); |