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[PATCH v6 3/8] file-posix: introduce get_sysfs_str_val for device zoned
From: |
Sam Li |
Subject: |
[PATCH v6 3/8] file-posix: introduce get_sysfs_str_val for device zoned model |
Date: |
Fri, 5 Aug 2022 15:57:46 +0800 |
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 <faithilikerun@gmail.com>
Reviewed-by: Hannes Reinecke <hare@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
- [PATCH v6 0/8] Add support for zoned device, Sam Li, 2022/08/05
- [PATCH v6 1/8] include: add zoned device structs, Sam Li, 2022/08/05
- [PATCH v6 2/8] file-posix: introduce get_sysfs_long_val for the long sysfs attribute, Sam Li, 2022/08/05
- [PATCH v6 3/8] file-posix: introduce get_sysfs_str_val for device zoned model,
Sam Li <=
- [PATCH v6 4/8] block: add block layer APIs resembling Linux ZonedBlockDevice ioctls, Sam Li, 2022/08/05
- [PATCH v6 5/8] raw-format: add zone operations to pass through requests, Sam Li, 2022/08/05
- [PATCH v6 6/8] config: add check to block layer, Sam Li, 2022/08/05
- [PATCH v6 7/8] qemu-iotests: test new zone operations, Sam Li, 2022/08/05
- [PATCH v6 8/8] docs/zoned-storage: add zoned device documentation, Sam Li, 2022/08/05