Use sysfs attribute files to get the string value of device zoned model. Then get_sysfs_zoned_model can convert it to BlockZoneModel type in QEMU.
Signed-off-by: Sam Li <faithilike...@gmail.com> Reviewed-by: Hannes Reinecke <h...@suse.de> --- block/file-posix.c | 70 ++++++++++++++++++++++++++++++++ include/block/block_int-common.h | 3 ++ 2 files changed, 73 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index a40eab64a2..4785203eea 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1264,6 +1264,68 @@ out: #endif } +/* + * Convert the zoned attribute file in sysfs to internal value. + */ +static int get_sysfs_str_val(int fd, struct stat *st, + const char *attribute, + char **val) { +#ifdef CONFIG_LINUX + char *buf = NULL; + g_autofree char *sysfspath = NULL; + int ret; + size_t len; + + if (!S_ISBLK(st->st_mode)) { + return -ENOTSUP; + } + + sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/%s", + major(st->st_rdev), minor(st->st_rdev), + attribute); + ret = g_file_get_contents(sysfspath, &buf, &len, NULL); + if (ret == -1) { + ret = -errno; + return ret; + } + + /* The file is ended with '\n' */ + if (buf[len - 1] == '\n') { + buf[len - 1] = '\0'; + } + + if (!strncpy(*val, buf, len)) { + ret = -errno; + return ret; + } + g_free(buf); + return 0; +#else + return -ENOTSUP; +#endif +} + +static int get_sysfs_zoned_model(int fd, struct stat *st, + BlockZoneModel *zoned) { + g_autofree char *val = NULL; + val = g_malloc(32); + get_sysfs_str_val(fd, st, "zoned", &val); + if (!val) { + return -ENOTSUP; + } + + if (strcmp(val, "host-managed") == 0) { + *zoned = BLK_Z_HM; + } else if (strcmp(val, "host-aware") == 0) { + *zoned = BLK_Z_HA; + } else if (strcmp(val, "none") == 0) { + *zoned = BLK_Z_NONE; + } else { + return -ENOTSUP; + } + return 0; +} + static int hdev_get_max_segments(int fd, struct stat *st) { int ret; if (S_ISCHR(st->st_mode)) { @@ -1279,6 +1341,8 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp) { BDRVRawState *s = bs->opaque; struct stat st; + int ret; + BlockZoneModel zoned; s->needs_alignment = raw_needs_alignment(bs); raw_probe_alignment(bs, s->fd, errp); @@ -1316,6 +1380,12 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp) bs->bl.max_hw_iov = ret; } } + + ret = get_sysfs_zoned_model(s->fd, &st, &zoned); + if (ret < 0) { + zoned = BLK_Z_NONE; + } + bs->bl.zoned = zoned; } static int check_for_dasd(int fd) diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 8947abab76..7f7863cc9e 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -825,6 +825,9 @@ typedef struct BlockLimits { /* maximum number of iovec elements */ int max_iov; + + /* device zone model */ + BlockZoneModel zoned; } BlockLimits; typedef struct BdrvOpBlocker BdrvOpBlocker; -- 2.37.1