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Subject[RFC PATCH 02/12] btrfs-progs: utils: Introduce queue_param
Date
Introduce the queue_param function to get a device request queue
parameter and this function to test if the device is an SSD in
is_ssd().

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
[Naohiro] fixed error return value
Signed-off-by: Naohiro Aota <naota@elisp.net>
---
mkfs/main.c | 40 ++--------------------------------------
utils.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
utils.h | 1 +
3 files changed, 49 insertions(+), 38 deletions(-)

diff --git a/mkfs/main.c b/mkfs/main.c
index b76462a7..83969b4b 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -435,49 +435,13 @@ static int zero_output_file(int out_fd, u64 size)

static int is_ssd(const char *file)
{
- blkid_probe probe;
- char wholedisk[PATH_MAX];
- char sysfs_path[PATH_MAX];
- dev_t devno;
- int fd;
char rotational;
int ret;

- probe = blkid_new_probe_from_filename(file);
- if (!probe)
+ ret = queue_param(file, "rotational", &rotational, 1);
+ if (ret < 1)
return 0;

- /* Device number of this disk (possibly a partition) */
- devno = blkid_probe_get_devno(probe);
- if (!devno) {
- blkid_free_probe(probe);
- return 0;
- }
-
- /* Get whole disk name (not full path) for this devno */
- ret = blkid_devno_to_wholedisk(devno,
- wholedisk, sizeof(wholedisk), NULL);
- if (ret) {
- blkid_free_probe(probe);
- return 0;
- }
-
- snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/rotational",
- wholedisk);
-
- blkid_free_probe(probe);
-
- fd = open(sysfs_path, O_RDONLY);
- if (fd < 0) {
- return 0;
- }
-
- if (read(fd, &rotational, 1) < 1) {
- close(fd);
- return 0;
- }
- close(fd);
-
return rotational == '0';
}

diff --git a/utils.c b/utils.c
index d4395b1f..2212692c 100644
--- a/utils.c
+++ b/utils.c
@@ -65,6 +65,52 @@ static unsigned short rand_seed[3];

struct btrfs_config bconf;

+/*
+ * Get a device request queue parameter.
+ */
+int queue_param(const char *file, const char *param, char *buf, size_t len)
+{
+ blkid_probe probe;
+ char wholedisk[PATH_MAX];
+ char sysfs_path[PATH_MAX];
+ dev_t devno;
+ int fd;
+ int ret;
+
+ probe = blkid_new_probe_from_filename(file);
+ if (!probe)
+ return 0;
+
+ /* Device number of this disk (possibly a partition) */
+ devno = blkid_probe_get_devno(probe);
+ if (!devno) {
+ blkid_free_probe(probe);
+ return 0;
+ }
+
+ /* Get whole disk name (not full path) for this devno */
+ ret = blkid_devno_to_wholedisk(devno,
+ wholedisk, sizeof(wholedisk), NULL);
+ if (ret) {
+ blkid_free_probe(probe);
+ return 0;
+ }
+
+ snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/%s",
+ wholedisk, param);
+
+ blkid_free_probe(probe);
+
+ fd = open(sysfs_path, O_RDONLY);
+ if (fd < 0)
+ return 0;
+
+ len = read(fd, buf, len);
+ close(fd);
+
+ return len;
+}
+
/*
* Discard the given range in one go
*/
diff --git a/utils.h b/utils.h
index b6c00cfa..ac333095 100644
--- a/utils.h
+++ b/utils.h
@@ -120,6 +120,7 @@ int get_label(const char *btrfs_dev, char *label);
int set_label(const char *btrfs_dev, const char *label);

char *__strncpy_null(char *dest, const char *src, size_t n);
+int queue_param(const char *file, const char *param, char *buf, size_t len);
int is_block_device(const char *file);
int is_mount_point(const char *file);
int is_path_exist(const char *file);
--
2.18.0
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