| /* |
| * 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 "qapi/error.h" |
| #include "qemu/cutils.h" |
| #include "qemu/error-report.h" |
| #include "block/block_int.h" |
| #include "qemu/module.h" |
| #include "qemu/option.h" |
| #include "qemu/units.h" |
| #include "trace.h" |
| #include "block/thread-pool.h" |
| #include "qemu/iov.h" |
| #include "block/raw-aio.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qstring.h" |
| |
| #include "scsi/pr-manager.h" |
| #include "scsi/constants.h" |
| |
| #if defined(__APPLE__) && (__MACH__) |
| #include <sys/ioctl.h> |
| #if defined(HAVE_HOST_BLOCK_DEVICE) |
| #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 <IOKit/storage/IODVDMedia.h> |
| #include <CoreFoundation/CoreFoundation.h> |
| #endif /* defined(HAVE_HOST_BLOCK_DEVICE) */ |
| #endif |
| |
| #ifdef __sun__ |
| #define _POSIX_PTHREAD_SEMANTICS 1 |
| #include <sys/dkio.h> |
| #endif |
| #ifdef __linux__ |
| #include <sys/ioctl.h> |
| #include <sys/param.h> |
| #include <sys/syscall.h> |
| #include <sys/vfs.h> |
| #include <linux/cdrom.h> |
| #include <linux/fd.h> |
| #include <linux/fs.h> |
| #include <linux/hdreg.h> |
| #include <linux/magic.h> |
| #include <scsi/sg.h> |
| #ifdef __s390__ |
| #include <asm/dasd.h> |
| #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 <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 |
| |
| /* 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 |
| |
| /* Posix file locking bytes. Libvirt takes byte 0, we start from higher bytes, |
| * leaving a few more bytes for its future use. */ |
| #define RAW_LOCK_PERM_BASE 100 |
| #define RAW_LOCK_SHARED_BASE 200 |
| |
| typedef struct BDRVRawState { |
| int fd; |
| bool use_lock; |
| int type; |
| int open_flags; |
| size_t buf_align; |
| |
| /* The current permissions. */ |
| uint64_t perm; |
| uint64_t shared_perm; |
| |
| /* The perms bits whose corresponding bytes are already locked in |
| * s->fd. */ |
| uint64_t locked_perm; |
| uint64_t locked_shared_perm; |
| |
| int perm_change_fd; |
| int perm_change_flags; |
| BDRVReopenState *reopen_state; |
| |
| #ifdef CONFIG_XFS |
| bool is_xfs:1; |
| #endif |
| bool has_discard:1; |
| bool has_write_zeroes:1; |
| bool discard_zeroes:1; |
| bool use_linux_aio:1; |
| bool use_linux_io_uring:1; |
| int page_cache_inconsistent; /* errno from fdatasync failure */ |
| bool has_fallocate; |
| bool needs_alignment; |
| bool drop_cache; |
| bool check_cache_dropped; |
| struct { |
| uint64_t discard_nb_ok; |
| uint64_t discard_nb_failed; |
| uint64_t discard_bytes_ok; |
| } stats; |
| |
| PRManager *pr_mgr; |
| } BDRVRawState; |
| |
| typedef struct BDRVRawReopenState { |
| int open_flags; |
| bool drop_cache; |
| bool check_cache_dropped; |
| } BDRVRawReopenState; |
| |
| 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 int64_t raw_getlength(BlockDriverState *bs); |
| |
| typedef struct RawPosixAIOData { |
| BlockDriverState *bs; |
| int aio_type; |
| int aio_fildes; |
| |
| off_t aio_offset; |
| uint64_t aio_nbytes; |
| |
| union { |
| struct { |
| struct iovec *iov; |
| int niov; |
| } io; |
| struct { |
| uint64_t cmd; |
| void *buf; |
| } ioctl; |
| struct { |
| int aio_fd2; |
| off_t aio_offset2; |
| } copy_range; |
| struct { |
| PreallocMode prealloc; |
| Error **errp; |
| } truncate; |
| }; |
| } RawPosixAIOData; |
| |
| #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) |
| static int cdrom_reopen(BlockDriverState *bs); |
| #endif |
| |
| /* |
| * Elide EAGAIN and EACCES details when failing to lock, as this |
| * indicates that the specified file region is already locked by |
| * another process, which is considered a common scenario. |
| */ |
| #define raw_lock_error_setg_errno(errp, err, fmt, ...) \ |
| do { \ |
| if ((err) == EAGAIN || (err) == EACCES) { \ |
| error_setg((errp), (fmt), ## __VA_ARGS__); \ |
| } else { \ |
| error_setg_errno((errp), (err), (fmt), ## __VA_ARGS__); \ |
| } \ |
| } while (0) |
| |
| #if defined(__NetBSD__) |
| static int raw_normalize_devicepath(const char **filename, Error **errp) |
| { |
| static char namebuf[PATH_MAX]; |
| const char *dp, *fname; |
| struct stat sb; |
| |
| fname = *filename; |
| dp = strrchr(fname, '/'); |
| if (lstat(fname, &sb) < 0) { |
| error_setg_file_open(errp, errno, fname); |
| 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); |
| } |
| *filename = namebuf; |
| warn_report("%s is a block device, using %s", fname, *filename); |
| |
| return 0; |
| } |
| #else |
| static int raw_normalize_devicepath(const char **filename, Error **errp) |
| { |
| 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; |
| int i; |
| |
| errno = ENOTSUP; |
| static const unsigned long ioctl_list[] = { |
| #ifdef BLKSSZGET |
| BLKSSZGET, |
| #endif |
| #ifdef DKIOCGETBLOCKSIZE |
| DKIOCGETBLOCKSIZE, |
| #endif |
| #ifdef DIOCGSECTORSIZE |
| DIOCGSECTORSIZE, |
| #endif |
| }; |
| |
| /* Try a few ioctls to get the right size */ |
| for (i = 0; i < (int)ARRAY_SIZE(ioctl_list); i++) { |
| if (ioctl(fd, ioctl_list[i], §or_size) >= 0) { |
| *sector_size_p = sector_size; |
| success = true; |
| } |
| } |
| |
| 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 |
| } |
| |
| /* |
| * Returns true if no alignment restrictions are necessary even for files |
| * opened with O_DIRECT. |
| * |
| * raw_probe_alignment() probes the required alignment and assume that 1 means |
| * the probing failed, so it falls back to a safe default of 4k. This can be |
| * avoided if we know that byte alignment is okay for the file. |
| */ |
| static bool dio_byte_aligned(int fd) |
| { |
| #ifdef __linux__ |
| struct statfs buf; |
| int ret; |
| |
| ret = fstatfs(fd, &buf); |
| if (ret == 0 && buf.f_type == NFS_SUPER_MAGIC) { |
| return true; |
| } |
| #endif |
| return false; |
| } |
| |
| /* 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, qemu_real_host_page_size); |
| size_t alignments[] = {1, 512, 1024, 2048, 4096}; |
| |
| /* 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->bl.request_alignment = 1; |
| s->buf_align = 1; |
| return; |
| } |
| |
| bs->bl.request_alignment = 0; |
| s->buf_align = 0; |
| /* Let's try to use the logical blocksize for the alignment. */ |
| if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) { |
| bs->bl.request_alignment = 0; |
| } |
| #ifdef CONFIG_XFS |
| if (s->is_xfs) { |
| struct dioattr da; |
| if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) { |
| bs->bl.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. First try |
| * to detect request alignment, since it is more likely to succeed. Then |
| * try to detect buf_align, which cannot be detected in some cases (e.g. |
| * Gluster). If buf_align cannot be detected, we fallback to the value of |
| * request_alignment. |
| */ |
| |
| if (!bs->bl.request_alignment) { |
| int i; |
| size_t align; |
| buf = qemu_memalign(max_align, max_align); |
| for (i = 0; i < ARRAY_SIZE(alignments); i++) { |
| align = alignments[i]; |
| if (raw_is_io_aligned(fd, buf, align)) { |
| /* Fallback to safe value. */ |
| bs->bl.request_alignment = (align != 1) ? align : max_align; |
| break; |
| } |
| } |
| qemu_vfree(buf); |
| } |
| |
| if (!s->buf_align) { |
| int i; |
| size_t align; |
| buf = qemu_memalign(max_align, 2 * max_align); |
| for (i = 0; i < ARRAY_SIZE(alignments); i++) { |
| align = alignments[i]; |
| if (raw_is_io_aligned(fd, buf + align, max_align)) { |
| /* Fallback to request_alignment. */ |
| s->buf_align = (align != 1) ? align : bs->bl.request_alignment; |
| break; |
| } |
| } |
| qemu_vfree(buf); |
| } |
| |
| if (!s->buf_align || !bs->bl.request_alignment) { |
| error_setg(errp, "Could not find working O_DIRECT alignment"); |
| error_append_hint(errp, "Try cache.direct=off\n"); |
| } |
| } |
| |
| static int check_hdev_writable(int fd) |
| { |
| #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(fd, &st)) { |
| return -errno; |
| } |
| |
| if (!S_ISBLK(st.st_mode)) { |
| return 0; |
| } |
| |
| if (ioctl(fd, BLKROGET, &readonly) < 0) { |
| return -errno; |
| } |
| |
| if (readonly) { |
| return -EACCES; |
| } |
| #endif /* defined(BLKROGET) */ |
| return 0; |
| } |
| |
| static void raw_parse_flags(int bdrv_flags, int *open_flags, bool has_writers) |
| { |
| bool read_write = false; |
| assert(open_flags != NULL); |
| |
| *open_flags |= O_BINARY; |
| *open_flags &= ~O_ACCMODE; |
| |
| if (bdrv_flags & BDRV_O_AUTO_RDONLY) { |
| read_write = has_writers; |
| } else if (bdrv_flags & BDRV_O_RDWR) { |
| read_write = true; |
| } |
| |
| if (read_write) { |
| *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_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| bdrv_parse_filename_strip_prefix(filename, "file:", options); |
| } |
| |
| 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", |
| }, |
| { |
| .name = "aio", |
| .type = QEMU_OPT_STRING, |
| .help = "host AIO implementation (threads, native, io_uring)", |
| }, |
| { |
| .name = "locking", |
| .type = QEMU_OPT_STRING, |
| .help = "file locking mode (on/off/auto, default: auto)", |
| }, |
| { |
| .name = "pr-manager", |
| .type = QEMU_OPT_STRING, |
| .help = "id of persistent reservation manager object (default: none)", |
| }, |
| #if defined(__linux__) |
| { |
| .name = "drop-cache", |
| .type = QEMU_OPT_BOOL, |
| .help = "invalidate page cache during live migration (default: on)", |
| }, |
| #endif |
| { |
| .name = "x-check-cache-dropped", |
| .type = QEMU_OPT_BOOL, |
| .help = "check that page cache was dropped on live migration (default: off)" |
| }, |
| { /* end of list */ } |
| }, |
| }; |
| |
| static const char *const mutable_opts[] = { "x-check-cache-dropped", NULL }; |
| |
| static int raw_open_common(BlockDriverState *bs, QDict *options, |
| int bdrv_flags, int open_flags, |
| bool device, Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| QemuOpts *opts; |
| Error *local_err = NULL; |
| const char *filename = NULL; |
| const char *str; |
| BlockdevAioOptions aio, aio_default; |
| int fd, ret; |
| struct stat st; |
| OnOffAuto locking; |
| |
| opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); |
| if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| filename = qemu_opt_get(opts, "filename"); |
| |
| ret = raw_normalize_devicepath(&filename, errp); |
| if (ret != 0) { |
| goto fail; |
| } |
| |
| if (bdrv_flags & BDRV_O_NATIVE_AIO) { |
| aio_default = BLOCKDEV_AIO_OPTIONS_NATIVE; |
| #ifdef CONFIG_LINUX_IO_URING |
| } else if (bdrv_flags & BDRV_O_IO_URING) { |
| aio_default = BLOCKDEV_AIO_OPTIONS_IO_URING; |
| #endif |
| } else { |
| aio_default = BLOCKDEV_AIO_OPTIONS_THREADS; |
| } |
| |
| aio = qapi_enum_parse(&BlockdevAioOptions_lookup, |
| qemu_opt_get(opts, "aio"), |
| aio_default, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| s->use_linux_aio = (aio == BLOCKDEV_AIO_OPTIONS_NATIVE); |
| #ifdef CONFIG_LINUX_IO_URING |
| s->use_linux_io_uring = (aio == BLOCKDEV_AIO_OPTIONS_IO_URING); |
| #endif |
| |
| locking = qapi_enum_parse(&OnOffAuto_lookup, |
| qemu_opt_get(opts, "locking"), |
| ON_OFF_AUTO_AUTO, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| ret = -EINVAL; |
| goto fail; |
| } |
| switch (locking) { |
| case ON_OFF_AUTO_ON: |
| s->use_lock = true; |
| if (!qemu_has_ofd_lock()) { |
| warn_report("File lock requested but OFD locking syscall is " |
| "unavailable, falling back to POSIX file locks"); |
| error_printf("Due to the implementation, locks can be lost " |
| "unexpectedly.\n"); |
| } |
| break; |
| case ON_OFF_AUTO_OFF: |
| s->use_lock = false; |
| break; |
| case ON_OFF_AUTO_AUTO: |
| s->use_lock = qemu_has_ofd_lock(); |
| break; |
| default: |
| abort(); |
| } |
| |
| str = qemu_opt_get(opts, "pr-manager"); |
| if (str) { |
| s->pr_mgr = pr_manager_lookup(str, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| ret = -EINVAL; |
| goto fail; |
| } |
| } |
| |
| s->drop_cache = qemu_opt_get_bool(opts, "drop-cache", true); |
| s->check_cache_dropped = qemu_opt_get_bool(opts, "x-check-cache-dropped", |
| false); |
| |
| s->open_flags = open_flags; |
| raw_parse_flags(bdrv_flags, &s->open_flags, false); |
| |
| s->fd = -1; |
| fd = qemu_open(filename, s->open_flags, errp); |
| ret = fd < 0 ? -errno : 0; |
| |
| if (ret < 0) { |
| if (ret == -EROFS) { |
| ret = -EACCES; |
| } |
| goto fail; |
| } |
| s->fd = fd; |
| |
| /* Check s->open_flags rather than bdrv_flags due to auto-read-only */ |
| if (s->open_flags & O_RDWR) { |
| ret = check_hdev_writable(s->fd); |
| if (ret < 0) { |
| error_setg_errno(errp, -ret, "The device is not writable"); |
| goto fail; |
| } |
| } |
| |
| s->perm = 0; |
| s->shared_perm = BLK_PERM_ALL; |
| |
| #ifdef CONFIG_LINUX_AIO |
| /* Currently Linux does AIO only for files opened with O_DIRECT */ |
| if (s->use_linux_aio) { |
| if (!(s->open_flags & O_DIRECT)) { |
| error_setg(errp, "aio=native was specified, but it requires " |
| "cache.direct=on, which was not specified."); |
| ret = -EINVAL; |
| goto fail; |
| } |
| if (!aio_setup_linux_aio(bdrv_get_aio_context(bs), errp)) { |
| error_prepend(errp, "Unable to use native AIO: "); |
| goto fail; |
| } |
| } |
| #else |
| if (s->use_linux_aio) { |
| error_setg(errp, "aio=native was specified, but is not supported " |
| "in this build."); |
| ret = -EINVAL; |
| goto fail; |
| } |
| #endif /* !defined(CONFIG_LINUX_AIO) */ |
| |
| #ifdef CONFIG_LINUX_IO_URING |
| if (s->use_linux_io_uring) { |
| if (!aio_setup_linux_io_uring(bdrv_get_aio_context(bs), errp)) { |
| error_prepend(errp, "Unable to use io_uring: "); |
| goto fail; |
| } |
| } |
| #else |
| if (s->use_linux_io_uring) { |
| error_setg(errp, "aio=io_uring was specified, but is not supported " |
| "in this build."); |
| ret = -EINVAL; |
| goto fail; |
| } |
| #endif /* !defined(CONFIG_LINUX_IO_URING) */ |
| |
| s->has_discard = true; |
| s->has_write_zeroes = true; |
| if ((bs->open_flags & BDRV_O_NOCACHE) != 0 && !dio_byte_aligned(s->fd)) { |
| s->needs_alignment = true; |
| } |
| |
| if (fstat(s->fd, &st) < 0) { |
| ret = -errno; |
| error_setg_errno(errp, errno, "Could not stat file"); |
| goto fail; |
| } |
| |
| if (!device) { |
| if (!S_ISREG(st.st_mode)) { |
| error_setg(errp, "'%s' driver requires '%s' to be a regular file", |
| bs->drv->format_name, bs->filename); |
| ret = -EINVAL; |
| goto fail; |
| } else { |
| s->discard_zeroes = true; |
| s->has_fallocate = true; |
| } |
| } else { |
| if (!(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
| error_setg(errp, "'%s' driver requires '%s' to be either " |
| "a character or block device", |
| bs->drv->format_name, bs->filename); |
| ret = -EINVAL; |
| goto fail; |
| } |
| } |
| |
| 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 |
| |
| bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK; |
| if (S_ISREG(st.st_mode)) { |
| /* When extending regular files, we get zeros from the OS */ |
| bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; |
| } |
| ret = 0; |
| fail: |
| if (ret < 0 && s->fd != -1) { |
| qemu_close(s->fd); |
| } |
| 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; |
| |
| s->type = FTYPE_FILE; |
| return raw_open_common(bs, options, flags, 0, false, errp); |
| } |
| |
| typedef enum { |
| RAW_PL_PREPARE, |
| RAW_PL_COMMIT, |
| RAW_PL_ABORT, |
| } RawPermLockOp; |
| |
| #define PERM_FOREACH(i) \ |
| for ((i) = 0; (1ULL << (i)) <= BLK_PERM_ALL; i++) |
| |
| /* Lock bytes indicated by @perm_lock_bits and @shared_perm_lock_bits in the |
| * file; if @unlock == true, also unlock the unneeded bytes. |
| * @shared_perm_lock_bits is the mask of all permissions that are NOT shared. |
| */ |
| static int raw_apply_lock_bytes(BDRVRawState *s, int fd, |
| uint64_t perm_lock_bits, |
| uint64_t shared_perm_lock_bits, |
| bool unlock, Error **errp) |
| { |
| int ret; |
| int i; |
| uint64_t locked_perm, locked_shared_perm; |
| |
| if (s) { |
| locked_perm = s->locked_perm; |
| locked_shared_perm = s->locked_shared_perm; |
| } else { |
| /* |
| * We don't have the previous bits, just lock/unlock for each of the |
| * requested bits. |
| */ |
| if (unlock) { |
| locked_perm = BLK_PERM_ALL; |
| locked_shared_perm = BLK_PERM_ALL; |
| } else { |
| locked_perm = 0; |
| locked_shared_perm = 0; |
| } |
| } |
| |
| PERM_FOREACH(i) { |
| int off = RAW_LOCK_PERM_BASE + i; |
| uint64_t bit = (1ULL << i); |
| if ((perm_lock_bits & bit) && !(locked_perm & bit)) { |
| ret = qemu_lock_fd(fd, off, 1, false); |
| if (ret) { |
| raw_lock_error_setg_errno(errp, -ret, "Failed to lock byte %d", |
| off); |
| return ret; |
| } else if (s) { |
| s->locked_perm |= bit; |
| } |
| } else if (unlock && (locked_perm & bit) && !(perm_lock_bits & bit)) { |
| ret = qemu_unlock_fd(fd, off, 1); |
| if (ret) { |
| error_setg_errno(errp, -ret, "Failed to unlock byte %d", off); |
| return ret; |
| } else if (s) { |
| s->locked_perm &= ~bit; |
| } |
| } |
| } |
| PERM_FOREACH(i) { |
| int off = RAW_LOCK_SHARED_BASE + i; |
| uint64_t bit = (1ULL << i); |
| if ((shared_perm_lock_bits & bit) && !(locked_shared_perm & bit)) { |
| ret = qemu_lock_fd(fd, off, 1, false); |
| if (ret) { |
| raw_lock_error_setg_errno(errp, -ret, "Failed to lock byte %d", |
| off); |
| return ret; |
| } else if (s) { |
| s->locked_shared_perm |= bit; |
| } |
| } else if (unlock && (locked_shared_perm & bit) && |
| !(shared_perm_lock_bits & bit)) { |
| ret = qemu_unlock_fd(fd, off, 1); |
| if (ret) { |
| error_setg_errno(errp, -ret, "Failed to unlock byte %d", off); |
| return ret; |
| } else if (s) { |
| s->locked_shared_perm &= ~bit; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| /* Check "unshared" bytes implied by @perm and ~@shared_perm in the file. */ |
| static int raw_check_lock_bytes(int fd, uint64_t perm, uint64_t shared_perm, |
| Error **errp) |
| { |
| int ret; |
| int i; |
| |
| PERM_FOREACH(i) { |
| int off = RAW_LOCK_SHARED_BASE + i; |
| uint64_t p = 1ULL << i; |
| if (perm & p) { |
| ret = qemu_lock_fd_test(fd, off, 1, true); |
| if (ret) { |
| char *perm_name = bdrv_perm_names(p); |
| |
| raw_lock_error_setg_errno(errp, -ret, |
| "Failed to get \"%s\" lock", |
| perm_name); |
| g_free(perm_name); |
| return ret; |
| } |
| } |
| } |
| PERM_FOREACH(i) { |
| int off = RAW_LOCK_PERM_BASE + i; |
| uint64_t p = 1ULL << i; |
| if (!(shared_perm & p)) { |
| ret = qemu_lock_fd_test(fd, off, 1, true); |
| if (ret) { |
| char *perm_name = bdrv_perm_names(p); |
| |
| raw_lock_error_setg_errno(errp, -ret, |
| "Failed to get shared \"%s\" lock", |
| perm_name); |
| g_free(perm_name); |
| return ret; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static int raw_handle_perm_lock(BlockDriverState *bs, |
| RawPermLockOp op, |
| uint64_t new_perm, uint64_t new_shared, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| int ret = 0; |
| Error *local_err = NULL; |
| |
| if (!s->use_lock) { |
| return 0; |
| } |
| |
| if (bdrv_get_flags(bs) & BDRV_O_INACTIVE) { |
| return 0; |
| } |
| |
| switch (op) { |
| case RAW_PL_PREPARE: |
| if ((s->perm | new_perm) == s->perm && |
| (s->shared_perm & new_shared) == s->shared_perm) |
| { |
| /* |
| * We are going to unlock bytes, it should not fail. If it fail due |
| * to some fs-dependent permission-unrelated reasons (which occurs |
| * sometimes on NFS and leads to abort in bdrv_replace_child) we |
| * can't prevent such errors by any check here. And we ignore them |
| * anyway in ABORT and COMMIT. |
| */ |
| return 0; |
| } |
| ret = raw_apply_lock_bytes(s, s->fd, s->perm | new_perm, |
| ~s->shared_perm | ~new_shared, |
| false, errp); |
| if (!ret) { |
| ret = raw_check_lock_bytes(s->fd, new_perm, new_shared, errp); |
| if (!ret) { |
| return 0; |
| } |
| error_append_hint(errp, |
| "Is another process using the image [%s]?\n", |
| bs->filename); |
| } |
| /* fall through to unlock bytes. */ |
| case RAW_PL_ABORT: |
| raw_apply_lock_bytes(s, s->fd, s->perm, ~s->shared_perm, |
| true, &local_err); |
| if (local_err) { |
| /* Theoretically the above call only unlocks bytes and it cannot |
| * fail. Something weird happened, report it. |
| */ |
| warn_report_err(local_err); |
| } |
| break; |
| case RAW_PL_COMMIT: |
| raw_apply_lock_bytes(s, s->fd, new_perm, ~new_shared, |
| true, &local_err); |
| if (local_err) { |
| /* Theoretically the above call only unlocks bytes and it cannot |
| * fail. Something weird happened, report it. |
| */ |
| warn_report_err(local_err); |
| } |
| break; |
| } |
| return ret; |
| } |
| |
| static int raw_reconfigure_getfd(BlockDriverState *bs, int flags, |
| int *open_flags, uint64_t perm, bool force_dup, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| int fd = -1; |
| int ret; |
| bool has_writers = perm & |
| (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_RESIZE); |
| int fcntl_flags = O_APPEND | O_NONBLOCK; |
| #ifdef O_NOATIME |
| fcntl_flags |= O_NOATIME; |
| #endif |
| |
| *open_flags = 0; |
| if (s->type == FTYPE_CD) { |
| *open_flags |= O_NONBLOCK; |
| } |
| |
| raw_parse_flags(flags, open_flags, has_writers); |
| |
| #ifdef O_ASYNC |
| /* Not all operating systems have O_ASYNC, and those that don't |
| * will not let us track the state into rs->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 (!force_dup && *open_flags == s->open_flags) { |
| /* We're lucky, the existing fd is fine */ |
| return s->fd; |
| } |
| |
| if ((*open_flags & ~fcntl_flags) == (s->open_flags & ~fcntl_flags)) { |
| /* dup the original fd */ |
| fd = qemu_dup(s->fd); |
| if (fd >= 0) { |
| ret = fcntl_setfl(fd, *open_flags); |
| if (ret) { |
| qemu_close(fd); |
| fd = -1; |
| } |
| } |
| } |
| |
| /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */ |
| if (fd == -1) { |
| const char *normalized_filename = bs->filename; |
| ret = raw_normalize_devicepath(&normalized_filename, errp); |
| if (ret >= 0) { |
| fd = qemu_open(normalized_filename, *open_flags, errp); |
| if (fd == -1) { |
| return -1; |
| } |
| } |
| } |
| |
| if (fd != -1 && (*open_flags & O_RDWR)) { |
| ret = check_hdev_writable(fd); |
| if (ret < 0) { |
| qemu_close(fd); |
| error_setg_errno(errp, -ret, "The device is not writable"); |
| return -1; |
| } |
| } |
| |
| return fd; |
| } |
| |
| static int raw_reopen_prepare(BDRVReopenState *state, |
| BlockReopenQueue *queue, Error **errp) |
| { |
| BDRVRawState *s; |
| BDRVRawReopenState *rs; |
| QemuOpts *opts; |
| int ret; |
| |
| assert(state != NULL); |
| assert(state->bs != NULL); |
| |
| s = state->bs->opaque; |
| |
| state->opaque = g_new0(BDRVRawReopenState, 1); |
| rs = state->opaque; |
| |
| /* Handle options changes */ |
| opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); |
| if (!qemu_opts_absorb_qdict(opts, state->options, errp)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| rs->drop_cache = qemu_opt_get_bool_del(opts, "drop-cache", true); |
| rs->check_cache_dropped = |
| qemu_opt_get_bool_del(opts, "x-check-cache-dropped", false); |
| |
| /* This driver's reopen function doesn't currently allow changing |
| * other options, so let's put them back in the original QDict and |
| * bdrv_reopen_prepare() will detect changes and complain. */ |
| qemu_opts_to_qdict(opts, state->options); |
| |
| /* |
| * As part of reopen prepare we also want to create new fd by |
| * raw_reconfigure_getfd(). But it wants updated "perm", when in |
| * bdrv_reopen_multiple() .bdrv_reopen_prepare() callback called prior to |
| * permission update. Happily, permission update is always a part (a seprate |
| * stage) of bdrv_reopen_multiple() so we can rely on this fact and |
| * reconfigure fd in raw_check_perm(). |
| */ |
| |
| s->reopen_state = state; |
| ret = 0; |
| |
| out: |
| qemu_opts_del(opts); |
| return ret; |
| } |
| |
| static void raw_reopen_commit(BDRVReopenState *state) |
| { |
| BDRVRawReopenState *rs = state->opaque; |
| BDRVRawState *s = state->bs->opaque; |
| |
| s->drop_cache = rs->drop_cache; |
| s->check_cache_dropped = rs->check_cache_dropped; |
| s->open_flags = rs->open_flags; |
| g_free(state->opaque); |
| state->opaque = NULL; |
| |
| assert(s->reopen_state == state); |
| s->reopen_state = NULL; |
| } |
| |
| |
| static void raw_reopen_abort(BDRVReopenState *state) |
| { |
| BDRVRawReopenState *rs = state->opaque; |
| BDRVRawState *s = state->bs->opaque; |
| |
| /* nothing to do if NULL, we didn't get far enough */ |
| if (rs == NULL) { |
| return; |
| } |
| |
| g_free(state->opaque); |
| state->opaque = NULL; |
| |
| assert(s->reopen_state == state); |
| s->reopen_state = NULL; |
| } |
| |
| static int hdev_get_max_hw_transfer(int fd, struct stat *st) |
| { |
| #ifdef BLKSECTGET |
| if (S_ISBLK(st->st_mode)) { |
| unsigned short max_sectors = 0; |
| if (ioctl(fd, BLKSECTGET, &max_sectors) == 0) { |
| return max_sectors * 512; |
| } |
| } else { |
| int max_bytes = 0; |
| if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) { |
| return max_bytes; |
| } |
| } |
| return -errno; |
| #else |
| return -ENOSYS; |
| #endif |
| } |
| |
| static int hdev_get_max_segments(int fd, struct stat *st) |
| { |
| #ifdef CONFIG_LINUX |
| char buf[32]; |
| const char *end; |
| char *sysfspath = NULL; |
| int ret; |
| int sysfd = -1; |
| long max_segments; |
| |
| if (S_ISCHR(st->st_mode)) { |
| if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) { |
| return ret; |
| } |
| return -ENOTSUP; |
| } |
| |
| if (!S_ISBLK(st->st_mode)) { |
| return -ENOTSUP; |
| } |
| |
| sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments", |
| major(st->st_rdev), minor(st->st_rdev)); |
| sysfd = open(sysfspath, O_RDONLY); |
| if (sysfd == -1) { |
| ret = -errno; |
| goto out; |
| } |
| do { |
| ret = read(sysfd, buf, sizeof(buf) - 1); |
| } while (ret == -1 && errno == EINTR); |
| if (ret < 0) { |
| ret = -errno; |
| goto out; |
| } else if (ret == 0) { |
| ret = -EIO; |
| goto out; |
| } |
| buf[ret] = 0; |
| /* The file is ended with '\n', pass 'end' to accept that. */ |
| ret = qemu_strtol(buf, &end, 10, &max_segments); |
| if (ret == 0 && end && *end == '\n') { |
| ret = max_segments; |
| } |
| |
| out: |
| if (sysfd != -1) { |
| close(sysfd); |
| } |
| g_free(sysfspath); |
| return ret; |
| #else |
| return -ENOTSUP; |
| #endif |
| } |
| |
| static void raw_refresh_limits(BlockDriverState *bs, Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| struct stat st; |
| |
| raw_probe_alignment(bs, s->fd, errp); |
| bs->bl.min_mem_alignment = s->buf_align; |
| bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size); |
| |
| /* |
| * Maximum transfers are best effort, so it is okay to ignore any |
| * errors. That said, based on the man page errors in fstat would be |
| * very much unexpected; the only possible case seems to be ENOMEM. |
| */ |
| if (fstat(s->fd, &st)) { |
| return; |
| } |
| |
| if (bs->sg || S_ISBLK(st.st_mode)) { |
| int ret = hdev_get_max_hw_transfer(s->fd, &st); |
| |
| if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) { |
| bs->bl.max_hw_transfer = ret; |
| } |
| |
| ret = hdev_get_max_segments(s->fd, &st); |
| if (ret > 0) { |
| bs->bl.max_iov = ret; |
| } |
| } |
| } |
| |
| 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 |
| |
| #if defined(__linux__) |
| static int handle_aiocb_ioctl(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| int ret; |
| |
| do { |
| ret = ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf); |
| } while (ret == -1 && errno == EINTR); |
| if (ret == -1) { |
| return -errno; |
| } |
| |
| return 0; |
| } |
| #endif /* linux */ |
| |
| static int handle_aiocb_flush(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| BDRVRawState *s = aiocb->bs->opaque; |
| int ret; |
| |
| if (s->page_cache_inconsistent) { |
| return -s->page_cache_inconsistent; |
| } |
| |
| ret = qemu_fdatasync(aiocb->aio_fildes); |
| if (ret == -1) { |
| trace_file_flush_fdatasync_failed(errno); |
| |
| /* There is no clear definition of the semantics of a failing fsync(), |
| * so we may have to assume the worst. The sad truth is that this |
| * assumption is correct for Linux. Some pages are now probably marked |
| * clean in the page cache even though they are inconsistent with the |
| * on-disk contents. The next fdatasync() call would succeed, but no |
| * further writeback attempt will be made. We can't get back to a state |
| * in which we know what is on disk (we would have to rewrite |
| * everything that was touched since the last fdatasync() at least), so |
| * make bdrv_flush() fail permanently. Given that the behaviour isn't |
| * really defined, I have little hope that other OSes are doing better. |
| * |
| * Obviously, this doesn't affect O_DIRECT, which bypasses the page |
| * cache. */ |
| if ((s->open_flags & O_DIRECT) == 0) { |
| s->page_cache_inconsistent = errno; |
| } |
| 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->io.iov, |
| aiocb->io.niov, |
| aiocb->aio_offset); |
| else |
| len = qemu_preadv(aiocb->aio_fildes, |
| aiocb->io.iov, |
| aiocb->io.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 int handle_aiocb_rw(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| 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->io.niov == 1) { |
| nbytes = handle_aiocb_rw_linear(aiocb, aiocb->io.iov->iov_base); |
| goto out; |
| } |
| /* |
| * 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)) { |
| goto out; |
| } |
| 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) { |
| nbytes = -ENOMEM; |
| goto out; |
| } |
| |
| if (aiocb->aio_type & QEMU_AIO_WRITE) { |
| char *p = buf; |
| int i; |
| |
| for (i = 0; i < aiocb->io.niov; ++i) { |
| memcpy(p, aiocb->io.iov[i].iov_base, aiocb->io.iov[i].iov_len); |
| p += aiocb->io.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->io.niov && count; ++i) { |
| copy = count; |
| if (copy > aiocb->io.iov[i].iov_len) { |
| copy = aiocb->io.iov[i].iov_len; |
| } |
| memcpy(aiocb->io.iov[i].iov_base, p, copy); |
| assert(count >= copy); |
| p += copy; |
| count -= copy; |
| } |
| assert(count == 0); |
| } |
| qemu_vfree(buf); |
| |
| out: |
| if (nbytes == aiocb->aio_nbytes) { |
| return 0; |
| } else if (nbytes >= 0 && nbytes < aiocb->aio_nbytes) { |
| if (aiocb->aio_type & QEMU_AIO_WRITE) { |
| return -EINVAL; |
| } else { |
| iov_memset(aiocb->io.iov, aiocb->io.niov, nbytes, |
| 0, aiocb->aio_nbytes - nbytes); |
| return 0; |
| } |
| } else { |
| assert(nbytes < 0); |
| return nbytes; |
| } |
| } |
| |
| 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 |
| /* The BLKZEROOUT implementation in the kernel doesn't set |
| * BLKDEV_ZERO_NOFALLBACK, so we can't call this if we have to avoid slow |
| * fallbacks. */ |
| if (!(aiocb->aio_type & QEMU_AIO_NO_FALLBACK)) { |
| 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); |
| if (ret == -ENOTSUP) { |
| s->has_write_zeroes = false; |
| } |
| } |
| #endif |
| |
| return ret; |
| } |
| |
| static int handle_aiocb_write_zeroes(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| #ifdef CONFIG_FALLOCATE |
| BDRVRawState *s = aiocb->bs->opaque; |
| int64_t len; |
| #endif |
| |
| if (aiocb->aio_type & QEMU_AIO_BLKDEV) { |
| return handle_aiocb_write_zeroes_block(aiocb); |
| } |
| |
| #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 == -ENOTSUP) { |
| s->has_write_zeroes = false; |
| } else if (ret == 0 || ret != -EINVAL) { |
| return ret; |
| } |
| /* |
| * Note: Some file systems do not like unaligned byte ranges, and |
| * return EINVAL in such a case, though they should not do it according |
| * to the man-page of fallocate(). Thus we simply ignore this return |
| * value and try the other fallbacks instead. |
| */ |
| } |
| #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 == -EINVAL) { |
| /* |
| * Some file systems like older versions of GPFS do not like un- |
| * aligned byte ranges, and return EINVAL in such a case, though |
| * they should not do it according to the man-page of fallocate(). |
| * Warn about the bad filesystem and try the final fallback instead. |
| */ |
| warn_report_once("Your file system is misbehaving: " |
| "fallocate(FALLOC_FL_PUNCH_HOLE) returned EINVAL. " |
| "Please report this bug to your file sytem " |
| "vendor."); |
| } else if (ret != -ENOTSUP) { |
| return ret; |
| } else { |
| s->has_discard = false; |
| } |
| } |
| #endif |
| |
| #ifdef CONFIG_FALLOCATE |
| /* Last resort: we are trying to extend the file with zeroed data. This |
| * can be done via fallocate(fd, 0) */ |
| len = bdrv_getlength(aiocb->bs); |
| if (s->has_fallocate && len >= 0 && aiocb->aio_offset >= len) { |
| 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 int handle_aiocb_write_zeroes_unmap(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| BDRVRawState *s G_GNUC_UNUSED = aiocb->bs->opaque; |
| |
| /* First try to write zeros and unmap at the same time */ |
| |
| #ifdef CONFIG_FALLOCATE_PUNCH_HOLE |
| int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, |
| aiocb->aio_offset, aiocb->aio_nbytes); |
| switch (ret) { |
| case -ENOTSUP: |
| case -EINVAL: |
| case -EBUSY: |
| break; |
| default: |
| return ret; |
| } |
| #endif |
| |
| /* If we couldn't manage to unmap while guaranteed that the area reads as |
| * all-zero afterwards, just write zeroes without unmapping */ |
| return handle_aiocb_write_zeroes(aiocb); |
| } |
| |
| #ifndef HAVE_COPY_FILE_RANGE |
| static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd, |
| off_t *out_off, size_t len, unsigned int flags) |
| { |
| #ifdef __NR_copy_file_range |
| return syscall(__NR_copy_file_range, in_fd, in_off, out_fd, |
| out_off, len, flags); |
| #else |
| errno = ENOSYS; |
| return -1; |
| #endif |
| } |
| #endif |
| |
| static int handle_aiocb_copy_range(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| uint64_t bytes = aiocb->aio_nbytes; |
| off_t in_off = aiocb->aio_offset; |
| off_t out_off = aiocb->copy_range.aio_offset2; |
| |
| while (bytes) { |
| ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off, |
| aiocb->copy_range.aio_fd2, &out_off, |
| bytes, 0); |
| trace_file_copy_file_range(aiocb->bs, aiocb->aio_fildes, in_off, |
| aiocb->copy_range.aio_fd2, out_off, bytes, |
| 0, ret); |
| if (ret == 0) { |
| /* No progress (e.g. when beyond EOF), let the caller fall back to |
| * buffer I/O. */ |
| return -ENOSPC; |
| } |
| if (ret < 0) { |
| switch (errno) { |
| case ENOSYS: |
| return -ENOTSUP; |
| case EINTR: |
| continue; |
| default: |
| return -errno; |
| } |
| } |
| bytes -= ret; |
| } |
| return 0; |
| } |
| |
| static int handle_aiocb_discard(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| 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_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; |
| } |
| |
| /* |
| * Help alignment probing by allocating the first block. |
| * |
| * When reading with direct I/O from unallocated area on Gluster backed by XFS, |
| * reading succeeds regardless of request length. In this case we fallback to |
| * safe alignment which is not optimal. Allocating the first block avoids this |
| * fallback. |
| * |
| * fd may be opened with O_DIRECT, but we don't know the buffer alignment or |
| * request alignment, so we use safe values. |
| * |
| * Returns: 0 on success, -errno on failure. Since this is an optimization, |
| * caller may ignore failures. |
| */ |
| static int allocate_first_block(int fd, size_t max_size) |
| { |
| size_t write_size = (max_size < MAX_BLOCKSIZE) |
| ? BDRV_SECTOR_SIZE |
| : MAX_BLOCKSIZE; |
| size_t max_align = MAX(MAX_BLOCKSIZE, qemu_real_host_page_size); |
| void *buf; |
| ssize_t n; |
| int ret; |
| |
| buf = qemu_memalign(max_align, write_size); |
| memset(buf, 0, write_size); |
| |
| do { |
| n = pwrite(fd, buf, write_size, 0); |
| } while (n == -1 && errno == EINTR); |
| |
| ret = (n == -1) ? -errno : 0; |
| |
| qemu_vfree(buf); |
| return ret; |
| } |
| |
| static int handle_aiocb_truncate(void *opaque) |
| { |
| RawPosixAIOData *aiocb = opaque; |
| int result = 0; |
| int64_t current_length = 0; |
| char *buf = NULL; |
| struct stat st; |
| int fd = aiocb->aio_fildes; |
| int64_t offset = aiocb->aio_offset; |
| PreallocMode prealloc = aiocb->truncate.prealloc; |
| Error **errp = aiocb->truncate.errp; |
| |
| if (fstat(fd, &st) < 0) { |
| result = -errno; |
| error_setg_errno(errp, -result, "Could not stat file"); |
| return result; |
| } |
| |
| current_length = st.st_size; |
| if (current_length > offset && prealloc != PREALLOC_MODE_OFF) { |
| error_setg(errp, "Cannot use preallocation for shrinking files"); |
| return -ENOTSUP; |
| } |
| |
| switch (prealloc) { |
| #ifdef CONFIG_POSIX_FALLOCATE |
| case PREALLOC_MODE_FALLOC: |
| /* |
| * Truncating before posix_fallocate() makes it about twice slower on |
| * file systems that do not support fallocate(), trying to check if a |
| * block is allocated before allocating it, so don't do that here. |
| */ |
| if (offset != current_length) { |
| result = -posix_fallocate(fd, current_length, |
| offset - current_length); |
| if (result != 0) { |
| /* posix_fallocate() doesn't set errno. */ |
| error_setg_errno(errp, -result, |
| "Could not preallocate new data"); |
| } else if (current_length == 0) { |
| /* |
| * posix_fallocate() uses fallocate() if the filesystem |
| * supports it, or fallback to manually writing zeroes. If |
| * fallocate() was used, unaligned reads from the fallocated |
| * area in raw_probe_alignment() will succeed, hence we need to |
| * allocate the first block. |
| * |
| * Optimize future alignment probing; ignore failures. |
| */ |
| allocate_first_block(fd, offset); |
| } |
| } else { |
| result = 0; |
| } |
| goto out; |
| #endif |
| case PREALLOC_MODE_FULL: |
| { |
| int64_t num = 0, left = offset - current_length; |
| off_t seek_result; |
| |
| /* |
| * Knowing the final size from the beginning could allow the file |
| * system driver to do less allocations and possibly avoid |
| * fragmentation of the file. |
| */ |
| if (ftruncate(fd, offset) != 0) { |
| result = -errno; |
| error_setg_errno(errp, -result, "Could not resize file"); |
| goto out; |
| } |
| |
| buf = g_malloc0(65536); |
| |
| seek_result = lseek(fd, current_length, SEEK_SET); |
| if (seek_result < 0) { |
| result = -errno; |
| error_setg_errno(errp, -result, |
| "Failed to seek to the old end of file"); |
| goto out; |
| } |
| |
| while (left > 0) { |
| num = MIN(left, 65536); |
| result = write(fd, buf, num); |
| if (result < 0) { |
| if (errno == EINTR) { |
| continue; |
| } |
| result = -errno; |
| error_setg_errno(errp, -result, |
| "Could not write zeros for preallocation"); |
| goto out; |
| } |
| left -= result; |
| } |
| if (result >= 0) { |
| result = fsync(fd); |
| if (result < 0) { |
| result = -errno; |
| error_setg_errno(errp, -result, |
| "Could not flush file to disk"); |
| goto out; |
| } |
| } |
| goto out; |
| } |
| case PREALLOC_MODE_OFF: |
| if (ftruncate(fd, offset) != 0) { |
| result = -errno; |
| error_setg_errno(errp, -result, "Could not resize file"); |
| } else if (current_length == 0 && offset > current_length) { |
| /* Optimize future alignment probing; ignore failures. */ |
| allocate_first_block(fd, offset); |
| } |
| return result; |
| default: |
| result = -ENOTSUP; |
| error_setg(errp, "Unsupported preallocation mode: %s", |
| PreallocMode_str(prealloc)); |
| return result; |
| } |
| |
| out: |
| if (result < 0) { |
| if (ftruncate(fd, current_length) < 0) { |
| error_report("Failed to restore old file length: %s", |
| strerror(errno)); |
| } |
| } |
| |
| g_free(buf); |
| return result; |
| } |
| |
| static int coroutine_fn raw_thread_pool_submit(BlockDriverState *bs, |
| ThreadPoolFunc func, void *arg) |
| { |
| /* @bs can be NULL, bdrv_get_aio_context() returns the main context then */ |
| ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); |
| return thread_pool_submit_co(pool, func, arg); |
| } |
| |
| static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset, |
| uint64_t bytes, QEMUIOVector *qiov, int type) |
| { |
| BDRVRawState *s = bs->opaque; |
| RawPosixAIOData acb; |
| |
| if (fd_open(bs) < 0) |
| return -EIO; |
| |
| /* |
| * When using O_DIRECT, the request must be aligned to be able to use |
| * either libaio or io_uring interface. If not fail back to regular thread |
| * pool read/write code which emulates this for us if we |
| * set QEMU_AIO_MISALIGNED. |
| */ |
| if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) { |
| type |= QEMU_AIO_MISALIGNED; |
| #ifdef CONFIG_LINUX_IO_URING |
| } else if (s->use_linux_io_uring) { |
| LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs)); |
| assert(qiov->size == bytes); |
| return luring_co_submit(bs, aio, s->fd, offset, qiov, type); |
| #endif |
| #ifdef CONFIG_LINUX_AIO |
| } else if (s->use_linux_aio) { |
| LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs)); |
| assert(qiov->size == bytes); |
| return laio_co_submit(bs, aio, s->fd, offset, qiov, type); |
| #endif |
| } |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_fildes = s->fd, |
| .aio_type = type, |
| .aio_offset = offset, |
| .aio_nbytes = bytes, |
| .io = { |
| .iov = qiov->iov, |
| .niov = qiov->niov, |
| }, |
| }; |
| |
| assert(qiov->size == bytes); |
| return raw_thread_pool_submit(bs, handle_aiocb_rw, &acb); |
| } |
| |
| static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset, |
| uint64_t bytes, QEMUIOVector *qiov, |
| int flags) |
| { |
| return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_READ); |
| } |
| |
| static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset, |
| uint64_t bytes, QEMUIOVector *qiov, |
| int flags) |
| { |
| assert(flags == 0); |
| return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE); |
| } |
| |
| static void raw_aio_plug(BlockDriverState *bs) |
| { |
| BDRVRawState __attribute__((unused)) *s = bs->opaque; |
| #ifdef CONFIG_LINUX_AIO |
| if (s->use_linux_aio) { |
| LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs)); |
| laio_io_plug(bs, aio); |
| } |
| #endif |
| #ifdef CONFIG_LINUX_IO_URING |
| if (s->use_linux_io_uring) { |
| LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs)); |
| luring_io_plug(bs, aio); |
| } |
| #endif |
| } |
| |
| static void raw_aio_unplug(BlockDriverState *bs) |
| { |
| BDRVRawState __attribute__((unused)) *s = bs->opaque; |
| #ifdef CONFIG_LINUX_AIO |
| if (s->use_linux_aio) { |
| LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs)); |
| laio_io_unplug(bs, aio); |
| } |
| #endif |
| #ifdef CONFIG_LINUX_IO_URING |
| if (s->use_linux_io_uring) { |
| LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs)); |
| luring_io_unplug(bs, aio); |
| } |
| #endif |
| } |
| |
| static int raw_co_flush_to_disk(BlockDriverState *bs) |
| { |
| BDRVRawState *s = bs->opaque; |
| RawPosixAIOData acb; |
| int ret; |
| |
| ret = fd_open(bs); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_fildes = s->fd, |
| .aio_type = QEMU_AIO_FLUSH, |
| }; |
| |
| #ifdef CONFIG_LINUX_IO_URING |
| if (s->use_linux_io_uring) { |
| LuringState *aio = aio_get_linux_io_uring(bdrv_get_aio_context(bs)); |
| return luring_co_submit(bs, aio, s->fd, 0, NULL, QEMU_AIO_FLUSH); |
| } |
| #endif |
| return raw_thread_pool_submit(bs, handle_aiocb_flush, &acb); |
| } |
| |
| static void raw_aio_attach_aio_context(BlockDriverState *bs, |
| AioContext *new_context) |
| { |
| BDRVRawState __attribute__((unused)) *s = bs->opaque; |
| #ifdef CONFIG_LINUX_AIO |
| if (s->use_linux_aio) { |
| Error *local_err = NULL; |
| if (!aio_setup_linux_aio(new_context, &local_err)) { |
| error_reportf_err(local_err, "Unable to use native AIO, " |
| "falling back to thread pool: "); |
| s->use_linux_aio = false; |
| } |
| } |
| #endif |
| #ifdef CONFIG_LINUX_IO_URING |
| if (s->use_linux_io_uring) { |
| Error *local_err = NULL; |
| if (!aio_setup_linux_io_uring(new_context, &local_err)) { |
| error_reportf_err(local_err, "Unable to use linux io_uring, " |
| "falling back to thread pool: "); |
| s->use_linux_io_uring = false; |
| } |
| } |
| #endif |
| } |
| |
| static void raw_close(BlockDriverState *bs) |
| { |
| BDRVRawState *s = bs->opaque; |
| |
| if (s->fd >= 0) { |
| qemu_close(s->fd); |
| s->fd = -1; |
| } |
| } |
| |
| /** |
| * Truncates the given regular file @fd to @offset and, when growing, fills the |
| * new space according to @prealloc. |
| * |
| * Returns: 0 on success, -errno on failure. |
| */ |
| static int coroutine_fn |
| raw_regular_truncate(BlockDriverState *bs, int fd, int64_t offset, |
| PreallocMode prealloc, Error **errp) |
| { |
| RawPosixAIOData acb; |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_fildes = fd, |
| .aio_type = QEMU_AIO_TRUNCATE, |
| .aio_offset = offset, |
| .truncate = { |
| .prealloc = prealloc, |
| .errp = errp, |
| }, |
| }; |
| |
| return raw_thread_pool_submit(bs, handle_aiocb_truncate, &acb); |
| } |
| |
| static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset, |
| bool exact, PreallocMode prealloc, |
| BdrvRequestFlags flags, Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| struct stat st; |
| int ret; |
| |
| if (fstat(s->fd, &st)) { |
| ret = -errno; |
| error_setg_errno(errp, -ret, "Failed to fstat() the file"); |
| return ret; |
| } |
| |
| if (S_ISREG(st.st_mode)) { |
| /* Always resizes to the exact @offset */ |
| return raw_regular_truncate(bs, s->fd, offset, prealloc, errp); |
| } |
| |
| if (prealloc != PREALLOC_MODE_OFF) { |
| error_setg(errp, "Preallocation mode '%s' unsupported for this " |
| "non-regular file", PreallocMode_str(prealloc)); |
| return -ENOTSUP; |
| } |
| |
| if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { |
| int64_t cur_length = raw_getlength(bs); |
| |
| if (offset != cur_length && exact) { |
| error_setg(errp, "Cannot resize device files"); |
| return -ENOTSUP; |
| } else if (offset > cur_length) { |
| error_setg(errp, "Cannot grow device files"); |
| return -EINVAL; |
| } |
| } else { |
| error_setg(errp, "Resizing this file is not supported"); |
| 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)) { |
| size = 0; |
| #ifdef DIOCGMEDIASIZE |
| if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) { |
| size = 0; |
| } |
| #endif |
| #ifdef DIOCGPART |
| if (size == 0) { |
| struct partinfo pi; |
| if (ioctl(fd, DIOCGPART, &pi) == 0) { |
| size = pi.media_size; |
| } |
| } |
| #endif |
| #if defined(DKIOCGETBLOCKCOUNT) && defined(DKIOCGETBLOCKSIZE) |
| if (size == 0) { |
| 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; |
| } |
| } |
| #endif |
| if (size == 0) { |
| size = lseek(fd, 0LL, SEEK_END); |
| } |
| if (size < 0) { |
| return -errno; |
| } |
| #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 coroutine_fn |
| raw_co_create(BlockdevCreateOptions *options, Error **errp) |
| { |
| BlockdevCreateOptionsFile *file_opts; |
| Error *local_err = NULL; |
| int fd; |
| uint64_t perm, shared; |
| int result = 0; |
| |
| /* Validate options and set default values */ |
| assert(options->driver == BLOCKDEV_DRIVER_FILE); |
| file_opts = &options->u.file; |
| |
| if (!file_opts->has_nocow) { |
| file_opts->nocow = false; |
| } |
| if (!file_opts->has_preallocation) { |
| file_opts->preallocation = PREALLOC_MODE_OFF; |
| } |
| if (!file_opts->has_extent_size_hint) { |
| file_opts->extent_size_hint = 1 * MiB; |
| } |
| if (file_opts->extent_size_hint > UINT32_MAX) { |
| result = -EINVAL; |
| error_setg(errp, "Extent size hint is too large"); |
| goto out; |
| } |
| |
| /* Create file */ |
| fd = qemu_create(file_opts->filename, O_RDWR | O_BINARY, 0644, errp); |
| if (fd < 0) { |
| result = -errno; |
| goto out; |
| } |
| |
| /* Take permissions: We want to discard everything, so we need |
| * BLK_PERM_WRITE; and truncation to the desired size requires |
| * BLK_PERM_RESIZE. |
| * On the other hand, we cannot share the RESIZE permission |
| * because we promise that after this function, the file has the |
| * size given in the options. If someone else were to resize it |
| * concurrently, we could not guarantee that. |
| * Note that after this function, we can no longer guarantee that |
| * the file is not touched by a third party, so it may be resized |
| * then. */ |
| perm = BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE; |
| |
| /* Step one: Take locks */ |
| result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp); |
| if (result < 0) { |
| goto out_close; |
| } |
| |
| /* Step two: Check that nobody else has taken conflicting locks */ |
| result = raw_check_lock_bytes(fd, perm, shared, errp); |
| if (result < 0) { |
| error_append_hint(errp, |
| "Is another process using the image [%s]?\n", |
| file_opts->filename); |
| goto out_unlock; |
| } |
| |
| /* Clear the file by truncating it to 0 */ |
| result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp); |
| if (result < 0) { |
| goto out_unlock; |
| } |
| |
| if (file_opts->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 |
| } |
| #ifdef FS_IOC_FSSETXATTR |
| /* |
| * Try to set the extent size hint. Failure is not fatal, and a warning is |
| * only printed if the option was explicitly specified. |
| */ |
| { |
| struct fsxattr attr; |
| result = ioctl(fd, FS_IOC_FSGETXATTR, &attr); |
| if (result == 0) { |
| attr.fsx_xflags |= FS_XFLAG_EXTSIZE; |
| attr.fsx_extsize = file_opts->extent_size_hint; |
| result = ioctl(fd, FS_IOC_FSSETXATTR, &attr); |
| } |
| if (result < 0 && file_opts->has_extent_size_hint && |
| file_opts->extent_size_hint) |
| { |
| warn_report("Failed to set extent size hint: %s", |
| strerror(errno)); |
| } |
| } |
| #endif |
| |
| /* Resize and potentially preallocate the file to the desired |
| * final size */ |
| result = raw_regular_truncate(NULL, fd, file_opts->size, |
| file_opts->preallocation, errp); |
| if (result < 0) { |
| goto out_unlock; |
| } |
| |
| out_unlock: |
| raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err); |
| if (local_err) { |
| /* The above call should not fail, and if it does, that does |
| * not mean the whole creation operation has failed. So |
| * report it the user for their convenience, but do not report |
| * it to the caller. */ |
| warn_report_err(local_err); |
| } |
| |
| 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; |
| } |
| |
| static int coroutine_fn raw_co_create_opts(BlockDriver *drv, |
| const char *filename, |
| QemuOpts *opts, |
| Error **errp) |
| { |
| BlockdevCreateOptions options; |
| int64_t total_size = 0; |
| int64_t extent_size_hint = 0; |
| bool has_extent_size_hint = false; |
| bool nocow = false; |
| PreallocMode prealloc; |
| char *buf = NULL; |
| Error *local_err = NULL; |
| |
| /* Skip file: protocol prefix */ |
| strstart(filename, "file:", &filename); |
| |
| /* Read out options */ |
| total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
| BDRV_SECTOR_SIZE); |
| if (qemu_opt_get(opts, BLOCK_OPT_EXTENT_SIZE_HINT)) { |
| has_extent_size_hint = true; |
| extent_size_hint = |
| qemu_opt_get_size_del(opts, BLOCK_OPT_EXTENT_SIZE_HINT, -1); |
| } |
| 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_OFF, &local_err); |
| g_free(buf); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return -EINVAL; |
| } |
| |
| options = (BlockdevCreateOptions) { |
| .driver = BLOCKDEV_DRIVER_FILE, |
| .u.file = { |
| .filename = (char *) filename, |
| .size = total_size, |
| .has_preallocation = true, |
| .preallocation = prealloc, |
| .has_nocow = true, |
| .nocow = nocow, |
| .has_extent_size_hint = has_extent_size_hint, |
| .extent_size_hint = extent_size_hint, |
| }, |
| }; |
| return raw_co_create(&options, errp); |
| } |
| |
| static int coroutine_fn raw_co_delete_file(BlockDriverState *bs, |
| Error **errp) |
| { |
| struct stat st; |
| int ret; |
| |
| if (!(stat(bs->filename, &st) == 0) || !S_ISREG(st.st_mode)) { |
| error_setg_errno(errp, ENOENT, "%s is not a regular file", |
| bs->filename); |
| return -ENOENT; |
| } |
| |
| ret = unlink(bs->filename); |
| if (ret < 0) { |
| ret = -errno; |
| error_setg_errno(errp, -ret, "Error when deleting file %s", |
| bs->filename); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * 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 */ |
| } |
| |
| if (offs < start) { |
| /* This is not a valid return by lseek(). We are safe to just return |
| * -EIO in this case, and we'll treat it like D4. */ |
| return -EIO; |
| } |
| |
| 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) */ |
| } |
| |
| if (offs < start) { |
| /* This is not a valid return by lseek(). We are safe to just return |
| * -EIO in this case, and we'll treat it like H4. */ |
| return -EIO; |
| } |
| |
| 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 offset. |
| * |
| * The block layer guarantees 'offset' and 'bytes' are within bounds. |
| * |
| * 'pnum' is set to the number of bytes (including and immediately following |
| * the specified offset) that are known to be in the same |
| * allocated/unallocated state. |
| * |
| * 'bytes' is the max value 'pnum' should be set to. |
| */ |
| static int coroutine_fn raw_co_block_status(BlockDriverState *bs, |
| bool want_zero, |
| int64_t offset, |
| int64_t bytes, int64_t *pnum, |
| int64_t *map, |
| BlockDriverState **file) |
| { |
| off_t data = 0, hole = 0; |
| int ret; |
| |
| assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); |
| |
| ret = fd_open(bs); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| if (!want_zero) { |
| *pnum = bytes; |
| *map = offset; |
| *file = bs; |
| return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
| } |
| |
| ret = find_allocation(bs, offset, &data, &hole); |
| if (ret == -ENXIO) { |
| /* Trailing hole */ |
| *pnum = bytes; |
| ret = BDRV_BLOCK_ZERO; |
| } else if (ret < 0) { |
| /* No info available, so pretend there are no holes */ |
| *pnum = bytes; |
| ret = BDRV_BLOCK_DATA; |
| } else if (data == offset) { |
| /* On a data extent, compute bytes to the end of the extent, |
| * possibly including a partial sector at EOF. */ |
| *pnum = MIN(bytes, hole - offset); |
| |
| /* |
| * We are not allowed to return partial sectors, though, so |
| * round up if necessary. |
| */ |
| if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) { |
| int64_t file_length = raw_getlength(bs); |
| if (file_length > 0) { |
| /* Ignore errors, this is just a safeguard */ |
| assert(hole == file_length); |
| } |
| *pnum = ROUND_UP(*pnum, bs->bl.request_alignment); |
| } |
| |
| ret = BDRV_BLOCK_DATA; |
| } else { |
| /* On a hole, compute bytes to the beginning of the next extent. */ |
| assert(hole == offset); |
| *pnum = MIN(bytes, data - offset); |
| ret = BDRV_BLOCK_ZERO; |
| } |
| *map = offset; |
| *file = bs; |
| return ret | BDRV_BLOCK_OFFSET_VALID; |
| } |
| |
| #if defined(__linux__) |
| /* Verify that the file is not in the page cache */ |
| static void check_cache_dropped(BlockDriverState *bs, Error **errp) |
| { |
| const size_t window_size = 128 * 1024 * 1024; |
| BDRVRawState *s = bs->opaque; |
| void *window = NULL; |
| size_t length = 0; |
| unsigned char *vec; |
| size_t page_size; |
| off_t offset; |
| off_t end; |
| |
| /* mincore(2) page status information requires 1 byte per page */ |
| page_size = sysconf(_SC_PAGESIZE); |
| vec = g_malloc(DIV_ROUND_UP(window_size, page_size)); |
| |
| end = raw_getlength(bs); |
| |
| for (offset = 0; offset < end; offset += window_size) { |
| void *new_window; |
| size_t new_length; |
| size_t vec_end; |
| size_t i; |
| int ret; |
| |
| /* Unmap previous window if size has changed */ |
| new_length = MIN(end - offset, window_size); |
| if (new_length != length) { |
| munmap(window, length); |
| window = NULL; |
| length = 0; |
| } |
| |
| new_window = mmap(window, new_length, PROT_NONE, MAP_PRIVATE, |
| s->fd, offset); |
| if (new_window == MAP_FAILED) { |
| error_setg_errno(errp, errno, "mmap failed"); |
| break; |
| } |
| |
| window = new_window; |
| length = new_length; |
| |
| ret = mincore(window, length, vec); |
| if (ret < 0) { |
| error_setg_errno(errp, errno, "mincore failed"); |
| break; |
| } |
| |
| vec_end = DIV_ROUND_UP(length, page_size); |
| for (i = 0; i < vec_end; i++) { |
| if (vec[i] & 0x1) { |
| break; |
| } |
| } |
| if (i < vec_end) { |
| error_setg(errp, "page cache still in use!"); |
| break; |
| } |
| } |
| |
| if (window) { |
| munmap(window, length); |
| } |
| |
| g_free(vec); |
| } |
| #endif /* __linux__ */ |
| |
| static void coroutine_fn raw_co_invalidate_cache(BlockDriverState *bs, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| int ret; |
| |
| ret = fd_open(bs); |
| if (ret < 0) { |
| error_setg_errno(errp, -ret, "The file descriptor is not open"); |
| return; |
| } |
| |
| if (!s->drop_cache) { |
| return; |
| } |
| |
| if (s->open_flags & O_DIRECT) { |
| return; /* No host kernel page cache */ |
| } |
| |
| #if defined(__linux__) |
| /* This sets the scene for the next syscall... */ |
| ret = bdrv_co_flush(bs); |
| if (ret < 0) { |
| error_setg_errno(errp, -ret, "flush failed"); |
| return; |
| } |
| |
| /* Linux does not invalidate pages that are dirty, locked, or mmapped by a |
| * process. These limitations are okay because we just fsynced the file, |
| * we don't use mmap, and the file should not be in use by other processes. |
| */ |
| ret = posix_fadvise(s->fd, 0, 0, POSIX_FADV_DONTNEED); |
| if (ret != 0) { /* the return value is a positive errno */ |
| error_setg_errno(errp, ret, "fadvise failed"); |
| return; |
| } |
| |
| if (s->check_cache_dropped) { |
| check_cache_dropped(bs, errp); |
| } |
| #else /* __linux__ */ |
| /* Do nothing. Live migration to a remote host with cache.direct=off is |
| * unsupported on other host operating systems. Cache consistency issues |
| * may occur but no error is reported here, partly because that's the |
| * historical behavior and partly because it's hard to differentiate valid |
| * configurations that should not cause errors. |
| */ |
| #endif /* !__linux__ */ |
| } |
| |
| static void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret) |
| { |
| if (ret) { |
| s->stats.discard_nb_failed++; |
| } else { |
| s->stats.discard_nb_ok++; |
| s->stats.discard_bytes_ok += nbytes; |
| } |
| } |
| |
| static coroutine_fn int |
| raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev) |
| { |
| BDRVRawState *s = bs->opaque; |
| RawPosixAIOData acb; |
| int ret; |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_fildes = s->fd, |
| .aio_type = QEMU_AIO_DISCARD, |
| .aio_offset = offset, |
| .aio_nbytes = bytes, |
| }; |
| |
| if (blkdev) { |
| acb.aio_type |= QEMU_AIO_BLKDEV; |
| } |
| |
| ret = raw_thread_pool_submit(bs, handle_aiocb_discard, &acb); |
| raw_account_discard(s, bytes, ret); |
| return ret; |
| } |
| |
| static coroutine_fn int |
| raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) |
| { |
| return raw_do_pdiscard(bs, offset, bytes, false); |
| } |
| |
| static int coroutine_fn |
| raw_do_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int bytes, |
| BdrvRequestFlags flags, bool blkdev) |
| { |
| BDRVRawState *s = bs->opaque; |
| RawPosixAIOData acb; |
| ThreadPoolFunc *handler; |
| |
| #ifdef CONFIG_FALLOCATE |
| if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { |
| BdrvTrackedRequest *req; |
| |
| /* |
| * This is a workaround for a bug in the Linux XFS driver, |
| * where writes submitted through the AIO interface will be |
| * discarded if they happen beyond a concurrently running |
| * fallocate() that increases the file length (i.e., both the |
| * write and the fallocate() happen beyond the EOF). |
| * |
| * To work around it, we extend the tracked request for this |
| * zero write until INT64_MAX (effectively infinity), and mark |
| * it as serializing. |
| * |
| * We have to enable this workaround for all filesystems and |
| * AIO modes (not just XFS with aio=native), because for |
| * remote filesystems we do not know the host configuration. |
| */ |
| |
| req = bdrv_co_get_self_request(bs); |
| assert(req); |
| assert(req->type == BDRV_TRACKED_WRITE); |
| assert(req->offset <= offset); |
| assert(req->offset + req->bytes >= offset + bytes); |
| |
| req->bytes = BDRV_MAX_LENGTH - req->offset; |
| |
| bdrv_check_request(req->offset, req->bytes, &error_abort); |
| |
| bdrv_make_request_serialising(req, bs->bl.request_alignment); |
| } |
| #endif |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_fildes = s->fd, |
| .aio_type = QEMU_AIO_WRITE_ZEROES, |
| .aio_offset = offset, |
| .aio_nbytes = bytes, |
| }; |
| |
| if (blkdev) { |
| acb.aio_type |= QEMU_AIO_BLKDEV; |
| } |
| if (flags & BDRV_REQ_NO_FALLBACK) { |
| acb.aio_type |= QEMU_AIO_NO_FALLBACK; |
| } |
| |
| if (flags & BDRV_REQ_MAY_UNMAP) { |
| acb.aio_type |= QEMU_AIO_DISCARD; |
| handler = handle_aiocb_write_zeroes_unmap; |
| } else { |
| handler = handle_aiocb_write_zeroes; |
| } |
| |
| return raw_thread_pool_submit(bs, handler, &acb); |
| } |
| |
| static int coroutine_fn raw_co_pwrite_zeroes( |
| BlockDriverState *bs, int64_t offset, |
| int bytes, BdrvRequestFlags flags) |
| { |
| return raw_do_pwrite_zeroes(bs, offset, bytes, flags, false); |
| } |
| |
| static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| { |
| return 0; |
| } |
| |
| static BlockStatsSpecificFile get_blockstats_specific_file(BlockDriverState *bs) |
| { |
| BDRVRawState *s = bs->opaque; |
| return (BlockStatsSpecificFile) { |
| .discard_nb_ok = s->stats.discard_nb_ok, |
| .discard_nb_failed = s->stats.discard_nb_failed, |
| .discard_bytes_ok = s->stats.discard_bytes_ok, |
| }; |
| } |
| |
| static BlockStatsSpecific *raw_get_specific_stats(BlockDriverState *bs) |
| { |
| BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); |
| |
| stats->driver = BLOCKDEV_DRIVER_FILE; |
| stats->u.file = get_blockstats_specific_file(bs); |
| |
| return stats; |
| } |
| |
| #if defined(HAVE_HOST_BLOCK_DEVICE) |
| static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs) |
| { |
| BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1); |
| |
| stats->driver = BLOCKDEV_DRIVER_HOST_DEVICE; |
| stats->u.host_device = get_blockstats_specific_file(bs); |
| |
| return stats; |
| } |
| #endif /* HAVE_HOST_BLOCK_DEVICE */ |
| |
| 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" |
| #ifdef CONFIG_POSIX_FALLOCATE |
| ", falloc" |
| #endif |
| ", full)" |
| }, |
| { |
| .name = BLOCK_OPT_EXTENT_SIZE_HINT, |
| .type = QEMU_OPT_SIZE, |
| .help = "Extent size hint for the image file, 0 to disable" |
| }, |
| { /* end of list */ } |
| } |
| }; |
| |
| static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| int input_flags = s->reopen_state ? s->reopen_state->flags : bs->open_flags; |
| int open_flags; |
| int ret; |
| |
| /* We may need a new fd if auto-read-only switches the mode */ |
| ret = raw_reconfigure_getfd(bs, input_flags, &open_flags, perm, |
| false, errp); |
| if (ret < 0) { |
| return ret; |
| } else if (ret != s->fd) { |
| Error *local_err = NULL; |
| |
| /* |
| * Fail already check_perm() if we can't get a working O_DIRECT |
| * alignment with the new fd. |
| */ |
| raw_probe_alignment(bs, ret, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return -EINVAL; |
| } |
| |
| s->perm_change_fd = ret; |
| s->perm_change_flags = open_flags; |
| } |
| |
| /* Prepare permissions on old fd to avoid conflicts between old and new, |
| * but keep everything locked that new will need. */ |
| ret = raw_handle_perm_lock(bs, RAW_PL_PREPARE, perm, shared, errp); |
| if (ret < 0) { |
| goto fail; |
| } |
| |
| /* Copy locks to the new fd */ |
| if (s->perm_change_fd && s->use_lock) { |
| ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared, |
| false, errp); |
| if (ret < 0) { |
| raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); |
| goto fail; |
| } |
| } |
| return 0; |
| |
| fail: |
| if (s->perm_change_fd) { |
| qemu_close(s->perm_change_fd); |
| } |
| s->perm_change_fd = 0; |
| return ret; |
| } |
| |
| static void raw_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared) |
| { |
| BDRVRawState *s = bs->opaque; |
| |
| /* For reopen, we have already switched to the new fd (.bdrv_set_perm is |
| * called after .bdrv_reopen_commit) */ |
| if (s->perm_change_fd && s->fd != s->perm_change_fd) { |
| qemu_close(s->fd); |
| s->fd = s->perm_change_fd; |
| s->open_flags = s->perm_change_flags; |
| } |
| s->perm_change_fd = 0; |
| |
| raw_handle_perm_lock(bs, RAW_PL_COMMIT, perm, shared, NULL); |
| s->perm = perm; |
| s->shared_perm = shared; |
| } |
| |
| static void raw_abort_perm_update(BlockDriverState *bs) |
| { |
| BDRVRawState *s = bs->opaque; |
| |
| /* For reopen, .bdrv_reopen_abort is called afterwards and will close |
| * the file descriptor. */ |
| if (s->perm_change_fd) { |
| qemu_close(s->perm_change_fd); |
| } |
| s->perm_change_fd = 0; |
| |
| raw_handle_perm_lock(bs, RAW_PL_ABORT, 0, 0, NULL); |
| } |
| |
| static int coroutine_fn raw_co_copy_range_from( |
| BlockDriverState *bs, BdrvChild *src, uint64_t src_offset, |
| BdrvChild *dst, uint64_t dst_offset, uint64_t bytes, |
| BdrvRequestFlags read_flags, BdrvRequestFlags write_flags) |
| { |
| return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, |
| read_flags, write_flags); |
| } |
| |
| static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs, |
| BdrvChild *src, |
| uint64_t src_offset, |
| BdrvChild *dst, |
| uint64_t dst_offset, |
| uint64_t bytes, |
| BdrvRequestFlags read_flags, |
| BdrvRequestFlags write_flags) |
| { |
| RawPosixAIOData acb; |
| BDRVRawState *s = bs->opaque; |
| BDRVRawState *src_s; |
| |
| assert(dst->bs == bs); |
| if (src->bs->drv->bdrv_co_copy_range_to != raw_co_copy_range_to) { |
| return -ENOTSUP; |
| } |
| |
| src_s = src->bs->opaque; |
| if (fd_open(src->bs) < 0 || fd_open(dst->bs) < 0) { |
| return -EIO; |
| } |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_type = QEMU_AIO_COPY_RANGE, |
| .aio_fildes = src_s->fd, |
| .aio_offset = src_offset, |
| .aio_nbytes = bytes, |
| .copy_range = { |
| .aio_fd2 = s->fd, |
| .aio_offset2 = dst_offset, |
| }, |
| }; |
| |
| return raw_thread_pool_submit(bs, handle_aiocb_copy_range, &acb); |
| } |
| |
| 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_co_create = raw_co_create, |
| .bdrv_co_create_opts = raw_co_create_opts, |
| .bdrv_has_zero_init = bdrv_has_zero_init_1, |
| .bdrv_co_block_status = raw_co_block_status, |
| .bdrv_co_invalidate_cache = raw_co_invalidate_cache, |
| .bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes, |
| .bdrv_co_delete_file = raw_co_delete_file, |
| |
| .bdrv_co_preadv = raw_co_preadv, |
| .bdrv_co_pwritev = raw_co_pwritev, |
| .bdrv_co_flush_to_disk = raw_co_flush_to_disk, |
| .bdrv_co_pdiscard = raw_co_pdiscard, |
| .bdrv_co_copy_range_from = raw_co_copy_range_from, |
| .bdrv_co_copy_range_to = raw_co_copy_range_to, |
| .bdrv_refresh_limits = raw_refresh_limits, |
| .bdrv_io_plug = raw_aio_plug, |
| .bdrv_io_unplug = raw_aio_unplug, |
| .bdrv_attach_aio_context = raw_aio_attach_aio_context, |
| |
| .bdrv_co_truncate = raw_co_truncate, |
| .bdrv_getlength = raw_getlength, |
| .bdrv_get_info = raw_get_info, |
| .bdrv_get_allocated_file_size |
| = raw_get_allocated_file_size, |
| .bdrv_get_specific_stats = raw_get_specific_stats, |
| .bdrv_check_perm = raw_check_perm, |
| .bdrv_set_perm = raw_set_perm, |
| .bdrv_abort_perm_update = raw_abort_perm_update, |
| .create_opts = &raw_create_opts, |
| .mutable_opts = mutable_opts, |
| }; |
| |
| /***********************************************/ |
| /* host device */ |
| |
| #if defined(HAVE_HOST_BLOCK_DEVICE) |
| |
| #if defined(__APPLE__) && defined(__MACH__) |
| static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, |
| CFIndex maxPathSize, int flags); |
| static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator) |
| { |
| kern_return_t kernResult = KERN_FAILURE; |
| mach_port_t masterPort; |
| CFMutableDictionaryRef classesToMatch; |
| const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass}; |
| char *mediaType = NULL; |
| |
| kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort ); |
| if ( KERN_SUCCESS != kernResult ) { |
| printf( "IOMasterPort returned %d\n", kernResult ); |
| } |
| |
| int index; |
| for (index = 0; index < ARRAY_SIZE(matching_array); index++) { |
| classesToMatch = IOServiceMatching(matching_array[index]); |
| if (classesToMatch == NULL) { |
| error_report("IOServiceMatching returned NULL for %s", |
| matching_array[index]); |
| continue; |
| } |
| CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey), |
| kCFBooleanTrue); |
| kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch, |
| mediaIterator); |
| if (kernResult != KERN_SUCCESS) { |
| error_report("Note: IOServiceGetMatchingServices returned %d", |
| kernResult); |
| continue; |
| } |
| |
| /* If a match was found, leave the loop */ |
| if (*mediaIterator != 0) { |
| trace_file_FindEjectableOpticalMedia(matching_array[index]); |
| mediaType = g_strdup(matching_array[index]); |
| break; |
| } |
| } |
| return mediaType; |
| } |
| |
| 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; |
| } |
| |
| /* Sets up a real cdrom for use in QEMU */ |
| static bool setup_cdrom(char *bsd_path, Error **errp) |
| { |
| int index, num_of_test_partitions = 2, fd; |
| char test_partition[MAXPATHLEN]; |
| bool partition_found = false; |
| |
| /* look for a working partition */ |
| for (index = 0; index < num_of_test_partitions; index++) { |
| snprintf(test_partition, sizeof(test_partition), "%ss%d", bsd_path, |
| index); |
| fd = qemu_open(test_partition, O_RDONLY | O_BINARY | O_LARGEFILE, NULL); |
| if (fd >= 0) { |
| partition_found = true; |
| qemu_close(fd); |
| break; |
| } |
| } |
| |
| /* if a working partition on the device was not found */ |
| if (partition_found == false) { |
| error_setg(errp, "Failed to find a working partition on disc"); |
| } else { |
| trace_file_setup_cdrom(test_partition); |
| pstrcpy(bsd_path, MAXPATHLEN, test_partition); |
| } |
| return partition_found; |
| } |
| |
| /* Prints directions on mounting and unmounting a device */ |
| static void print_unmounting_directions(const char *file_name) |
| { |
| error_report("If device %s is mounted on the desktop, unmount" |
| " it first before using it in QEMU", file_name); |
| error_report("Command to unmount device: diskutil unmountDisk %s", |
| file_name); |
| error_report("Command to mount device: diskutil mountDisk %s", file_name); |
| } |
| |
| #endif /* defined(__APPLE__) && defined(__MACH__) */ |
| |
| 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 void hdev_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| bdrv_parse_filename_strip_prefix(filename, "host_device:", options); |
| } |
| |
| static bool hdev_is_sg(BlockDriverState *bs) |
| { |
| |
| #if defined(__linux__) |
| |
| BDRVRawState *s = bs->opaque; |
| struct stat st; |
| struct sg_scsi_id scsiid; |
| int sg_version; |
| int ret; |
| |
| if (stat(bs->filename, &st) < 0 || !S_ISCHR(st.st_mode)) { |
| return false; |
| } |
| |
| ret = ioctl(s->fd, SG_GET_VERSION_NUM, &sg_version); |
| if (ret < 0) { |
| return false; |
| } |
| |
| ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid); |
| if (ret >= 0) { |
| trace_file_hdev_is_sg(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; |
| int ret; |
| |
| #if defined(__APPLE__) && defined(__MACH__) |
| /* |
| * Caution: while qdict_get_str() is fine, getting non-string types |
| * would require more care. When @options come from -blockdev or |
| * blockdev_add, its members are typed according to the QAPI |
| * schema, but when they come from -drive, they're all QString. |
| */ |
| const char *filename = qdict_get_str(options, "filename"); |
| char bsd_path[MAXPATHLEN] = ""; |
| bool error_occurred = false; |
| |
| /* If using a real cdrom */ |
| if (strcmp(filename, "/dev/cdrom") == 0) { |
| char *mediaType = NULL; |
| kern_return_t ret_val; |
| io_iterator_t mediaIterator = 0; |
| |
| mediaType = FindEjectableOpticalMedia(&mediaIterator); |
| if (mediaType == NULL) { |
| error_setg(errp, "Please make sure your CD/DVD is in the optical" |
| " drive"); |
| error_occurred = true; |
| goto hdev_open_Mac_error; |
| } |
| |
| ret_val = GetBSDPath(mediaIterator, bsd_path, sizeof(bsd_path), flags); |
| if (ret_val != KERN_SUCCESS) { |
| error_setg(errp, "Could not get BSD path for optical drive"); |
| error_occurred = true; |
| goto hdev_open_Mac_error; |
| } |
| |
| /* If a real optical drive was not found */ |
| if (bsd_path[0] == '\0') { |
| error_setg(errp, "Failed to obtain bsd path for optical drive"); |
| error_occurred = true; |
| goto hdev_open_Mac_error; |
| } |
| |
| /* If using a cdrom disc and finding a partition on the disc failed */ |
| if (strncmp(mediaType, kIOCDMediaClass, 9) == 0 && |
| setup_cdrom(bsd_path, errp) == false) { |
| print_unmounting_directions(bsd_path); |
| error_occurred = true; |
| goto hdev_open_Mac_error; |
| } |
| |
| qdict_put_str(options, "filename", bsd_path); |
| |
| hdev_open_Mac_error: |
| g_free(mediaType); |
| if (mediaIterator) { |
| IOObjectRelease(mediaIterator); |
| } |
| if (error_occurred) { |
| return -ENOENT; |
| } |
| } |
| #endif /* defined(__APPLE__) && defined(__MACH__) */ |
| |
| s->type = FTYPE_FILE; |
| |
| ret = raw_open_common(bs, options, flags, 0, true, errp); |
| if (ret < 0) { |
| #if defined(__APPLE__) && defined(__MACH__) |
| if (*bsd_path) { |
| filename = bsd_path; |
| } |
| /* if a physical device experienced an error while being opened */ |
| if (strncmp(filename, "/dev/", 5) == 0) { |
| print_unmounting_directions(filename); |
| } |
| #endif /* defined(__APPLE__) && defined(__MACH__) */ |
| return ret; |
| } |
| |
| /* Since this does ioctl the device must be already opened */ |
| bs->sg = hdev_is_sg(bs); |
| |
| return ret; |
| } |
| |
| #if defined(__linux__) |
| static int coroutine_fn |
| hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| { |
| BDRVRawState *s = bs->opaque; |
| RawPosixAIOData acb; |
| int ret; |
| |
| ret = fd_open(bs); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| if (req == SG_IO && s->pr_mgr) { |
| struct sg_io_hdr *io_hdr = buf; |
| if (io_hdr->cmdp[0] == PERSISTENT_RESERVE_OUT || |
| io_hdr->cmdp[0] == PERSISTENT_RESERVE_IN) { |
| return pr_manager_execute(s->pr_mgr, bdrv_get_aio_context(bs), |
| s->fd, io_hdr); |
| } |
| } |
| |
| acb = (RawPosixAIOData) { |
| .bs = bs, |
| .aio_type = QEMU_AIO_IOCTL, |
| .aio_fildes = s->fd, |
| .aio_offset = 0, |
| .ioctl = { |
| .buf = buf, |
| .cmd = req, |
| }, |
| }; |
| |
| return raw_thread_pool_submit(bs, handle_aiocb_ioctl, &acb); |
| } |
| #endif /* linux */ |
| |
| static coroutine_fn int |
| hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) |
| { |
| BDRVRawState *s = bs->opaque; |
| int ret; |
| |
| ret = fd_open(bs); |
| if (ret < 0) { |
| raw_account_discard(s, bytes, ret); |
| return ret; |
| } |
| return raw_do_pdiscard(bs, offset, bytes, true); |
| } |
| |
| static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs, |
| int64_t offset, int bytes, BdrvRequestFlags flags) |
| { |
| int rc; |
| |
| rc = fd_open(bs); |
| if (rc < 0) { |
| return rc; |
| } |
| |
| return raw_do_pwrite_zeroes(bs, offset, bytes, flags, true); |
| } |
| |
| 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_co_create_opts = bdrv_co_create_opts_simple, |
| .create_opts = &bdrv_create_opts_simple, |
| .mutable_opts = mutable_opts, |
| .bdrv_co_invalidate_cache = raw_co_invalidate_cache, |
| .bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes, |
| |
| .bdrv_co_preadv = raw_co_preadv, |
| .bdrv_co_pwritev = raw_co_pwritev, |
| .bdrv_co_flush_to_disk = raw_co_flush_to_disk, |
| .bdrv_co_pdiscard = hdev_co_pdiscard, |
| .bdrv_co_copy_range_from = raw_co_copy_range_from, |
| .bdrv_co_copy_range_to = raw_co_copy_range_to, |
| .bdrv_refresh_limits = raw_refresh_limits, |
| .bdrv_io_plug = raw_aio_plug, |
| .bdrv_io_unplug = raw_aio_unplug, |
| .bdrv_attach_aio_context = raw_aio_attach_aio_context, |
| |
| .bdrv_co_truncate = raw_co_truncate, |
| .bdrv_getlength = raw_getlength, |
| .bdrv_get_info = raw_get_info, |
| .bdrv_get_allocated_file_size |
| = raw_get_allocated_file_size, |
| .bdrv_get_specific_stats = hdev_get_specific_stats, |
| .bdrv_check_perm = raw_check_perm, |
| .bdrv_set_perm = raw_set_perm, |
| .bdrv_abort_perm_update = raw_abort_perm_update, |
| .bdrv_probe_blocksizes = hdev_probe_blocksizes, |
| .bdrv_probe_geometry = hdev_probe_geometry, |
| |
| /* generic scsi device */ |
| #ifdef __linux__ |
| .bdrv_co_ioctl = hdev_co_ioctl, |
| #endif |
| }; |
| |
| #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) |
| static void cdrom_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| bdrv_parse_filename_strip_prefix(filename, "host_cdrom:", options); |
| } |
| #endif |
| |
| #ifdef __linux__ |
| static int cdrom_open(BlockDriverState *bs, QDict *options, int flags, |
| Error **errp) |
| { |
| BDRVRawState *s = bs->opaque; |
| |
| s->type = FTYPE_CD; |
| |
| /* open will not fail even if no CD is inserted, so add O_NONBLOCK */ |
| return raw_open_common(bs, options, flags, O_NONBLOCK, true, errp); |
| } |
| |
| 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, NULL); |
| 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_co_create_opts = bdrv_co_create_opts_simple, |
| .create_opts = &bdrv_create_opts_simple, |
| .mutable_opts = mutable_opts, |
| .bdrv_co_invalidate_cache = raw_co_invalidate_cache, |
| |
| .bdrv_co_preadv = raw_co_preadv, |
| .bdrv_co_pwritev = raw_co_pwritev, |
| .bdrv_co_flush_to_disk = raw_co_flush_to_disk, |
| .bdrv_refresh_limits = raw_refresh_limits, |
| .bdrv_io_plug = raw_aio_plug, |
| .bdrv_io_unplug = raw_aio_unplug, |
| .bdrv_attach_aio_context = raw_aio_attach_aio_context, |
| |
| .bdrv_co_truncate = raw_co_truncate, |
| .bdrv_getlength = raw_getlength, |
| .has_variable_length = true, |
| .bdrv_get_allocated_file_size |
| = raw_get_allocated_file_size, |
| |
| /* removable device support */ |
| .bdrv_is_inserted = cdrom_is_inserted, |
| .bdrv_eject = cdrom_eject, |
| .bdrv_lock_medium = cdrom_lock_medium, |
| |
| /* generic scsi device */ |
| .bdrv_co_ioctl = hdev_co_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; |
| int ret; |
| |
| s->type = FTYPE_CD; |
| |
| ret = raw_open_common(bs, options, flags, 0, true, errp); |
| if (ret) { |
| 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, NULL); |
| 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_co_create_opts = bdrv_co_create_opts_simple, |
| .create_opts = &bdrv_create_opts_simple, |
| .mutable_opts = mutable_opts, |
| |
| .bdrv_co_preadv = raw_co_preadv, |
| .bdrv_co_pwritev = raw_co_pwritev, |
| .bdrv_co_flush_to_disk = raw_co_flush_to_disk, |
| .bdrv_refresh_limits = raw_refresh_limits, |
| .bdrv_io_plug = raw_aio_plug, |
| .bdrv_io_unplug = raw_aio_unplug, |
| .bdrv_attach_aio_context = raw_aio_attach_aio_context, |
| |
| .bdrv_co_truncate = raw_co_truncate, |
| .bdrv_getlength = raw_getlength, |
| .has_variable_length = true, |
| .bdrv_get_allocated_file_size |
| = raw_get_allocated_file_size, |
| |
| /* removable device support */ |
| .bdrv_is_inserted = cdrom_is_inserted, |
| .bdrv_eject = cdrom_eject, |
| .bdrv_lock_medium = cdrom_lock_medium, |
| }; |
| #endif /* __FreeBSD__ */ |
| |
| #endif /* HAVE_HOST_BLOCK_DEVICE */ |
| |
| 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); |
| #if defined(HAVE_HOST_BLOCK_DEVICE) |
| 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 |
| #endif /* HAVE_HOST_BLOCK_DEVICE */ |
| } |
| |
| block_init(bdrv_file_init); |