raw-posix: split hdev drivers
Instead of declaring one BlockDriver for all host devices declared one for each type: a generic one for normal disk devices, a Linux floppy driver and a CDROM driver for Linux and FreeBSD. This gets rid of a lot of messy ifdefs and switching based on the type in the various removal device methods. block.c grows a new method to find the correct host device driver based on OS-sepcific criteria, which will later into the actual drivers in a later patch in this series. Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
Christoph Hellwig
parent
90babde0ca
commit
f3a5d3f8a1
66
block.c
66
block.c
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@ -249,8 +249,48 @@ static BlockDriver *find_protocol(const char *filename)
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return NULL;
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}
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/* XXX: force raw format if block or character device ? It would
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simplify the BSD case */
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/*
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* Detect host devices. By convention, /dev/cdrom[N] is always
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* recognized as a host CDROM.
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*/
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#ifdef _WIN32
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static BlockDriver *find_hdev_driver(const char *filename)
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{
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if (strstart(filename, "/dev/cdrom", NULL))
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return bdrv_find_format("host_device");
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if (is_windows_drive(filename))
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return bdrv_find_format("host_device");
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return NULL;
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}
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#else
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static BlockDriver *find_hdev_driver(const char *filename)
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{
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struct stat st;
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#ifdef __linux__
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if (strstart(filename, "/dev/fd", NULL))
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return bdrv_find_format("host_floppy");
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if (strstart(filename, "/dev/cd", NULL))
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return bdrv_find_format("host_cdrom");
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#elif defined(__FreeBSD__)
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if (strstart(filename, "/dev/cd", NULL) ||
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strstart(filename, "/dev/acd", NULL)) {
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return bdrv_find_format("host_cdrom");
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}
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#else
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if (strstart(filename, "/dev/cdrom", NULL))
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return bdrv_find_format("host_device");
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#endif
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if (stat(filename, &st) >= 0 &&
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(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
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return bdrv_find_format("host_device");
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}
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return NULL;
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}
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#endif
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static BlockDriver *find_image_format(const char *filename)
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{
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int ret, score, score_max;
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@ -258,23 +298,6 @@ static BlockDriver *find_image_format(const char *filename)
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uint8_t buf[2048];
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BlockDriverState *bs;
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/* detect host devices. By convention, /dev/cdrom[N] is always
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recognized as a host CDROM */
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if (strstart(filename, "/dev/cdrom", NULL))
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return bdrv_find_format("host_device");
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#ifdef _WIN32
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if (is_windows_drive(filename))
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return bdrv_find_format("host_device");
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#else
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{
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struct stat st;
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if (stat(filename, &st) >= 0 &&
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(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
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return bdrv_find_format("host_device");
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}
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}
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#endif
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drv = find_protocol(filename);
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/* no need to test disk image formats for vvfat */
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if (drv && strcmp(drv->format_name, "vvfat") == 0)
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@ -394,7 +417,10 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
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if (flags & BDRV_O_FILE) {
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drv = find_protocol(filename);
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} else if (!drv) {
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drv = find_image_format(filename);
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drv = find_hdev_driver(filename);
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if (!drv) {
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drv = find_image_format(filename);
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}
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}
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if (!drv) {
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ret = -ENOENT;
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@ -119,11 +119,9 @@ static int posix_aio_init(void);
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static int fd_open(BlockDriverState *bs);
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#if defined(__FreeBSD__)
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static int cd_open(BlockDriverState *bs);
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static int cdrom_reopen(BlockDriverState *bs);
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#endif
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static int raw_is_inserted(BlockDriverState *bs);
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static int raw_open_common(BlockDriverState *bs, const char *filename,
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int flags)
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{
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@ -808,7 +806,7 @@ again:
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if (size == 2048LL * (unsigned)-1)
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size = 0;
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/* XXX no disc? maybe we need to reopen... */
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if (size <= 0 && !reopened && cd_open(bs) >= 0) {
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if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
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reopened = 1;
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goto again;
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}
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@ -958,7 +956,6 @@ kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex ma
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static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
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{
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BDRVRawState *s = bs->opaque;
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int ret;
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#ifdef CONFIG_COCOA
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if (strstart(filename, "/dev/cdrom", NULL)) {
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@ -988,46 +985,13 @@ static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
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#endif
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s->type = FTYPE_FILE;
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#if defined(__linux__)
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if (strstart(filename, "/dev/cd", NULL)) {
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/* open will not fail even if no CD is inserted */
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s->open_flags |= O_NONBLOCK;
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s->type = FTYPE_CD;
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} else if (strstart(filename, "/dev/fd", NULL)) {
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s->type = FTYPE_FD;
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/* open will not fail even if no floppy is inserted */
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s->open_flags |= O_NONBLOCK;
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#ifdef CONFIG_AIO
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} else if (strstart(filename, "/dev/sg", NULL)) {
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#if defined(__linux__) && defined(CONFIG_AIO)
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if (strstart(filename, "/dev/sg", NULL)) {
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bs->sg = 1;
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#endif
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}
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#endif
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#if defined(__FreeBSD__)
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if (strstart(filename, "/dev/cd", NULL) ||
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strstart(filename, "/dev/acd", NULL)) {
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s->type = FTYPE_CD;
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}
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#endif
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ret = raw_open_common(bs, filename, flags);
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if (ret)
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return ret;
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#if defined(__FreeBSD__)
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/* make sure the door isnt locked at this time */
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if (s->type == FTYPE_CD)
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ioctl (s->fd, CDIOCALLOW);
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#endif
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#if defined(__linux__)
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/* close fd so that we can reopen it as needed */
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if (s->type == FTYPE_FD) {
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close(s->fd);
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s->fd = -1;
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s->fd_media_changed = 1;
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}
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#endif
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return 0;
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return raw_open_common(bs, filename, flags);
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}
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#if defined(__linux__)
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@ -1080,105 +1044,6 @@ static int fd_open(BlockDriverState *bs)
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return 0;
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}
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static int raw_is_inserted(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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int ret;
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switch(s->type) {
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case FTYPE_CD:
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ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
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if (ret == CDS_DISC_OK)
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return 1;
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else
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return 0;
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break;
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case FTYPE_FD:
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ret = fd_open(bs);
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return (ret >= 0);
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default:
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return 1;
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}
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}
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/* currently only used by fdc.c, but a CD version would be good too */
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static int raw_media_changed(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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switch(s->type) {
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case FTYPE_FD:
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{
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int ret;
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/* XXX: we do not have a true media changed indication. It
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does not work if the floppy is changed without trying
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to read it */
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fd_open(bs);
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ret = s->fd_media_changed;
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s->fd_media_changed = 0;
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#ifdef DEBUG_FLOPPY
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printf("Floppy changed=%d\n", ret);
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#endif
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return ret;
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}
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default:
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return -ENOTSUP;
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}
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}
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static int raw_eject(BlockDriverState *bs, int eject_flag)
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{
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BDRVRawState *s = bs->opaque;
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switch(s->type) {
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case FTYPE_CD:
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if (eject_flag) {
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if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
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perror("CDROMEJECT");
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} else {
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if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
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perror("CDROMEJECT");
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}
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break;
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case FTYPE_FD:
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{
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int fd;
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if (s->fd >= 0) {
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close(s->fd);
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s->fd = -1;
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}
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fd = open(bs->filename, s->open_flags | O_NONBLOCK);
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if (fd >= 0) {
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if (ioctl(fd, FDEJECT, 0) < 0)
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perror("FDEJECT");
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close(fd);
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}
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}
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static int raw_set_locked(BlockDriverState *bs, int locked)
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{
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BDRVRawState *s = bs->opaque;
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switch(s->type) {
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case FTYPE_CD:
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if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
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/* Note: an error can happen if the distribution automatically
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mounts the CD-ROM */
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// perror("CDROM_LOCKDOOR");
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}
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
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{
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BDRVRawState *s = bs->opaque;
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@ -1220,7 +1085,6 @@ static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
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#endif
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#elif defined(__FreeBSD__)
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static int fd_open(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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@ -1231,99 +1095,6 @@ static int fd_open(BlockDriverState *bs)
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return -EIO;
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}
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static int cd_open(BlockDriverState *bs)
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{
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#if defined(__FreeBSD__)
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BDRVRawState *s = bs->opaque;
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int fd;
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switch(s->type) {
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case FTYPE_CD:
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/* XXX force reread of possibly changed/newly loaded disc,
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* FreeBSD seems to not notice sometimes... */
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if (s->fd >= 0)
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close (s->fd);
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fd = open(bs->filename, s->open_flags, 0644);
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if (fd < 0) {
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s->fd = -1;
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return -EIO;
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}
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s->fd = fd;
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/* make sure the door isnt locked at this time */
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ioctl (s->fd, CDIOCALLOW);
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}
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#endif
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return 0;
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}
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static int raw_is_inserted(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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switch(s->type) {
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case FTYPE_CD:
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return (raw_getlength(bs) > 0);
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case FTYPE_FD:
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/* XXX handle this */
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/* FALLTHRU */
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default:
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return 1;
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}
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}
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static int raw_media_changed(BlockDriverState *bs)
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{
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return -ENOTSUP;
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}
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static int raw_eject(BlockDriverState *bs, int eject_flag)
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{
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BDRVRawState *s = bs->opaque;
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switch(s->type) {
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case FTYPE_CD:
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if (s->fd < 0)
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return -ENOTSUP;
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(void) ioctl (s->fd, CDIOCALLOW);
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if (eject_flag) {
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if (ioctl (s->fd, CDIOCEJECT) < 0)
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perror("CDIOCEJECT");
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} else {
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if (ioctl (s->fd, CDIOCCLOSE) < 0)
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perror("CDIOCCLOSE");
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}
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if (cd_open(bs) < 0)
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return -ENOTSUP;
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break;
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case FTYPE_FD:
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/* XXX handle this */
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/* FALLTHRU */
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static int raw_set_locked(BlockDriverState *bs, int locked)
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{
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BDRVRawState *s = bs->opaque;
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switch(s->type) {
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case FTYPE_CD:
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if (s->fd < 0)
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return -ENOTSUP;
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if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
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/* Note: an error can happen if the distribution automatically
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mounts the CD-ROM */
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// perror("CDROM_LOCKDOOR");
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}
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
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{
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return -ENOTSUP;
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@ -1335,26 +1106,6 @@ static int fd_open(BlockDriverState *bs)
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return 0;
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}
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static int raw_is_inserted(BlockDriverState *bs)
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{
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return 1;
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}
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static int raw_media_changed(BlockDriverState *bs)
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{
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return -ENOTSUP;
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}
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static int raw_eject(BlockDriverState *bs, int eject_flag)
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{
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return -ENOTSUP;
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}
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static int raw_set_locked(BlockDriverState *bs, int locked)
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{
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return -ENOTSUP;
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}
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static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
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{
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return -ENOTSUP;
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@ -1415,22 +1166,315 @@ static BlockDriver bdrv_host_device = {
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.bdrv_write = raw_write,
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.bdrv_getlength = raw_getlength,
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/* removable device support */
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.bdrv_is_inserted = raw_is_inserted,
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.bdrv_media_changed = raw_media_changed,
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.bdrv_eject = raw_eject,
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.bdrv_set_locked = raw_set_locked,
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/* generic scsi device */
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.bdrv_ioctl = raw_ioctl,
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.bdrv_ioctl = raw_ioctl,
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#ifdef CONFIG_AIO
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.bdrv_aio_ioctl = raw_aio_ioctl,
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.bdrv_aio_ioctl = raw_aio_ioctl,
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#endif
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};
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#ifdef __linux__
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static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
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{
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BDRVRawState *s = bs->opaque;
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int ret;
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posix_aio_init();
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s->type = FTYPE_FD;
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/* open will not fail even if no floppy is inserted */
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s->open_flags |= O_NONBLOCK;
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ret = raw_open_common(bs, filename, flags);
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if (ret)
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return ret;
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/* close fd so that we can reopen it as needed */
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close(s->fd);
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s->fd = -1;
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s->fd_media_changed = 1;
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return 0;
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}
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static int floppy_is_inserted(BlockDriverState *bs)
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{
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return fd_open(bs) >= 0;
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}
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static int floppy_media_changed(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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int ret;
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/*
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* XXX: we do not have a true media changed indication.
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* It does not work if the floppy is changed without trying to read it.
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*/
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fd_open(bs);
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ret = s->fd_media_changed;
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s->fd_media_changed = 0;
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#ifdef DEBUG_FLOPPY
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printf("Floppy changed=%d\n", ret);
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#endif
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return ret;
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}
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static int floppy_eject(BlockDriverState *bs, int eject_flag)
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{
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BDRVRawState *s = bs->opaque;
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int fd;
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if (s->fd >= 0) {
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close(s->fd);
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s->fd = -1;
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}
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fd = open(bs->filename, s->open_flags | O_NONBLOCK);
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if (fd >= 0) {
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if (ioctl(fd, FDEJECT, 0) < 0)
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perror("FDEJECT");
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close(fd);
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}
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return 0;
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}
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static BlockDriver bdrv_host_floppy = {
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.format_name = "host_floppy",
|
||||
.instance_size = sizeof(BDRVRawState),
|
||||
.bdrv_open = floppy_open,
|
||||
.bdrv_close = raw_close,
|
||||
.bdrv_create = hdev_create,
|
||||
.bdrv_flush = raw_flush,
|
||||
|
||||
#ifdef CONFIG_AIO
|
||||
.bdrv_aio_readv = raw_aio_readv,
|
||||
.bdrv_aio_writev = raw_aio_writev,
|
||||
#endif
|
||||
|
||||
.bdrv_read = raw_read,
|
||||
.bdrv_write = raw_write,
|
||||
.bdrv_getlength = raw_getlength,
|
||||
|
||||
/* removable device support */
|
||||
.bdrv_is_inserted = floppy_is_inserted,
|
||||
.bdrv_media_changed = floppy_media_changed,
|
||||
.bdrv_eject = floppy_eject,
|
||||
|
||||
/* generic scsi device */
|
||||
.bdrv_ioctl = raw_ioctl,
|
||||
#ifdef CONFIG_AIO
|
||||
.bdrv_aio_ioctl = raw_aio_ioctl,
|
||||
#endif
|
||||
};
|
||||
|
||||
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
|
||||
/* open will not fail even if no CD is inserted */
|
||||
s->open_flags |= O_NONBLOCK;
|
||||
s->type = FTYPE_CD;
|
||||
|
||||
return raw_open_common(bs, filename, flags);
|
||||
}
|
||||
|
||||
static int cdrom_is_inserted(BlockDriverState *bs)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
int ret;
|
||||
|
||||
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
|
||||
if (ret == CDS_DISC_OK)
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cdrom_eject(BlockDriverState *bs, int eject_flag)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
|
||||
if (eject_flag) {
|
||||
if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
|
||||
perror("CDROMEJECT");
|
||||
} else {
|
||||
if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
|
||||
perror("CDROMEJECT");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cdrom_set_locked(BlockDriverState *bs, int locked)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
|
||||
if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
|
||||
/*
|
||||
* Note: an error can happen if the distribution automatically
|
||||
* mounts the CD-ROM
|
||||
*/
|
||||
/* perror("CDROM_LOCKDOOR"); */
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static BlockDriver bdrv_host_cdrom = {
|
||||
.format_name = "host_cdrom",
|
||||
.instance_size = sizeof(BDRVRawState),
|
||||
.bdrv_open = cdrom_open,
|
||||
.bdrv_close = raw_close,
|
||||
.bdrv_create = hdev_create,
|
||||
.bdrv_flush = raw_flush,
|
||||
|
||||
#ifdef CONFIG_AIO
|
||||
.bdrv_aio_readv = raw_aio_readv,
|
||||
.bdrv_aio_writev = raw_aio_writev,
|
||||
#endif
|
||||
|
||||
.bdrv_read = raw_read,
|
||||
.bdrv_write = raw_write,
|
||||
.bdrv_getlength = raw_getlength,
|
||||
|
||||
/* removable device support */
|
||||
.bdrv_is_inserted = cdrom_is_inserted,
|
||||
.bdrv_eject = cdrom_eject,
|
||||
.bdrv_set_locked = cdrom_set_locked,
|
||||
|
||||
/* generic scsi device */
|
||||
.bdrv_ioctl = raw_ioctl,
|
||||
#ifdef CONFIG_AIO
|
||||
.bdrv_aio_ioctl = raw_aio_ioctl,
|
||||
#endif
|
||||
};
|
||||
#endif /* __linux__ */
|
||||
|
||||
#ifdef __FreeBSD__
|
||||
static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
int ret;
|
||||
|
||||
s->type = FTYPE_CD;
|
||||
|
||||
ret = raw_open_common(bs, filename, flags);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* make sure the door isnt locked at this time */
|
||||
ioctl(s->fd, CDIOCALLOW);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cdrom_reopen(BlockDriverState *bs)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
int fd;
|
||||
|
||||
/*
|
||||
* Force reread of possibly changed/newly loaded disc,
|
||||
* FreeBSD seems to not notice sometimes...
|
||||
*/
|
||||
if (s->fd >= 0)
|
||||
close(s->fd);
|
||||
fd = open(bs->filename, s->open_flags, 0644);
|
||||
if (fd < 0) {
|
||||
s->fd = -1;
|
||||
return -EIO;
|
||||
}
|
||||
s->fd = fd;
|
||||
|
||||
/* make sure the door isnt locked at this time */
|
||||
ioctl(s->fd, CDIOCALLOW);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cdrom_is_inserted(BlockDriverState *bs)
|
||||
{
|
||||
return raw_getlength(bs) > 0;
|
||||
}
|
||||
|
||||
static int cdrom_eject(BlockDriverState *bs, int eject_flag)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
|
||||
if (s->fd < 0)
|
||||
return -ENOTSUP;
|
||||
|
||||
(void) ioctl(s->fd, CDIOCALLOW);
|
||||
|
||||
if (eject_flag) {
|
||||
if (ioctl(s->fd, CDIOCEJECT) < 0)
|
||||
perror("CDIOCEJECT");
|
||||
} else {
|
||||
if (ioctl(s->fd, CDIOCCLOSE) < 0)
|
||||
perror("CDIOCCLOSE");
|
||||
}
|
||||
|
||||
if (cdrom_reopen(bs) < 0)
|
||||
return -ENOTSUP;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cdrom_set_locked(BlockDriverState *bs, int locked)
|
||||
{
|
||||
BDRVRawState *s = bs->opaque;
|
||||
|
||||
if (s->fd < 0)
|
||||
return -ENOTSUP;
|
||||
if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
|
||||
/*
|
||||
* Note: an error can happen if the distribution automatically
|
||||
* mounts the CD-ROM
|
||||
*/
|
||||
/* perror("CDROM_LOCKDOOR"); */
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static BlockDriver bdrv_host_cdrom = {
|
||||
.format_name = "host_cdrom",
|
||||
.instance_size = sizeof(BDRVRawState),
|
||||
.bdrv_open = cdrom_open,
|
||||
.bdrv_close = raw_close,
|
||||
.bdrv_create = hdev_create,
|
||||
.bdrv_flush = raw_flush,
|
||||
|
||||
#ifdef CONFIG_AIO
|
||||
.bdrv_aio_readv = raw_aio_readv,
|
||||
.bdrv_aio_writev = raw_aio_writev,
|
||||
#endif
|
||||
|
||||
.bdrv_read = raw_read,
|
||||
.bdrv_write = raw_write,
|
||||
.bdrv_getlength = raw_getlength,
|
||||
|
||||
/* removable device support */
|
||||
.bdrv_is_inserted = cdrom_is_inserted,
|
||||
.bdrv_eject = cdrom_eject,
|
||||
.bdrv_set_locked = cdrom_set_locked,
|
||||
|
||||
/* generic scsi device */
|
||||
.bdrv_ioctl = raw_ioctl,
|
||||
#ifdef CONFIG_AIO
|
||||
.bdrv_aio_ioctl = raw_aio_ioctl,
|
||||
#endif
|
||||
};
|
||||
#endif /* __FreeBSD__ */
|
||||
|
||||
static void bdrv_raw_init(void)
|
||||
{
|
||||
bdrv_register(&bdrv_raw);
|
||||
bdrv_register(&bdrv_host_device);
|
||||
#ifdef __linux__
|
||||
bdrv_register(&bdrv_host_floppy);
|
||||
bdrv_register(&bdrv_host_cdrom);
|
||||
#endif
|
||||
#ifdef __FreeBSD__
|
||||
bdrv_register(&bdrv_host_cdrom);
|
||||
#endif
|
||||
}
|
||||
|
||||
block_init(bdrv_raw_init);
|
||||
|
|
|
|||
Loading…
Reference in New Issue