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[PATCH v6 2/8] file-posix: introduce get_sysfs_long_val for the long sys
From: |
Sam Li |
Subject: |
[PATCH v6 2/8] file-posix: introduce get_sysfs_long_val for the long sysfs attribute |
Date: |
Fri, 5 Aug 2022 15:57:45 +0800 |
Use sysfs attribute files to get the long value of zoned device
information.
Signed-off-by: Sam Li <faithilikerun@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
block/file-posix.c | 37 +++++++++++++++++++++++--------------
1 file changed, 23 insertions(+), 14 deletions(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index 48cd096624..a40eab64a2 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1210,29 +1210,27 @@ static int hdev_get_max_hw_transfer(int fd, struct stat
*st)
#endif
}
-static int hdev_get_max_segments(int fd, struct stat *st)
-{
+/*
+ * Get zoned device information (chunk_sectors, zoned_append_max_bytes,
+ * max_open_zones, max_active_zones) through sysfs attribute files.
+ */
+static long get_sysfs_long_val(int fd, struct stat *st,
+ const char *attribute) {
#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;
- }
+ long val;
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));
+ 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;
@@ -1250,9 +1248,9 @@ static int hdev_get_max_segments(int fd, struct stat *st)
}
buf[ret] = 0;
/* The file is ended with '\n', pass 'end' to accept that. */
- ret = qemu_strtol(buf, &end, 10, &max_segments);
+ ret = qemu_strtol(buf, &end, 10, &val);
if (ret == 0 && end && *end == '\n') {
- ret = max_segments;
+ ret = val;
}
out:
@@ -1266,6 +1264,17 @@ out:
#endif
}
+static int hdev_get_max_segments(int fd, struct stat *st) {
+ int ret;
+ if (S_ISCHR(st->st_mode)) {
+ if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) {
+ return ret;
+ }
+ return -ENOTSUP;
+ }
+ return get_sysfs_long_val(fd, st, "max_segments");
+}
+
static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVRawState *s = bs->opaque;
--
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 <=
- [PATCH v6 3/8] file-posix: introduce get_sysfs_str_val for device zoned model, Sam Li, 2022/08/05
- [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