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[RFC v5 04/11] file-posix: introduce get_sysfs_str_val for device zoned
From: |
Sam Li |
Subject: |
[RFC v5 04/11] file-posix: introduce get_sysfs_str_val for device zoned model |
Date: |
Mon, 1 Aug 2022 09:32:48 +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>
---
block/file-posix.c | 86 ++++++++++++++++++++++++++++++++
include/block/block_int-common.h | 3 ++
2 files changed, 89 insertions(+)
diff --git a/block/file-posix.c b/block/file-posix.c
index bcf898f0cb..0d8b4acdc7 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1271,6 +1271,85 @@ 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[32];
+ char *sysfspath = NULL;
+ int ret, offset;
+ int sysfd = -1;
+
+ 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/%s",
+ major(st->st_rdev), minor(st->st_rdev),
+ attribute);
+ sysfd = open(sysfspath, O_RDONLY);
+ if (sysfd == -1) {
+ ret = -errno;
+ goto out;
+ }
+ offset = 0;
+ do {
+ ret = read(sysfd, buf + offset, sizeof(buf) - 1 + offset);
+ if (ret > 0) {
+ offset += ret;
+ }
+ } while (ret == -1);
+ /* The file is ended with '\n' */
+ if (buf[ret - 1] == '\n') {
+ buf[ret - 1] = '\0';
+ }
+
+ if (!strncpy(*val, buf, ret)) {
+ goto out;
+ }
+
+out:
+ if (sysfd != -1) {
+ close(sysfd);
+ }
+ g_free(sysfspath);
+ return ret;
+#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) {
return get_sysfs_long_val(fd, st, "max_segments");
}
@@ -1279,6 +1358,8 @@ 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 +1397,11 @@ 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
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