From: Edward Liaw via ltp <ltp@lists.linux.it>
To: ltp@lists.linux.it
Cc: kernel-team@android.com
Subject: [LTP] [PATCH v1 2/3] set_dev_loop_path: Refactor set_dev_path and check return value
Date: Mon, 20 Mar 2023 22:37:22 +0000 [thread overview]
Message-ID: <20230320223723.2030960-3-edliaw@google.com> (raw)
In-Reply-To: <20230320223723.2030960-1-edliaw@google.com>
tst_find_free_loopdev does not check the return value of set_dev_path
and will return the last attempted path even if it does not pass a stat
check. set_dev_path also has a return value that is not consistent with
the other functions in this file.
Renames the function to set_dev_loop_path, the const array to
dev_loop_variants and changes the return value to 0 on success and 1 on
failure. Check the return value when called in tst_find_free_loopdev
for failure to acquire a loop device.
Signed-off-by: Edward Liaw <edliaw@google.com>
---
lib/tst_device.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/lib/tst_device.c b/lib/tst_device.c
index a61c5a748..ae665f7b6 100644
--- a/lib/tst_device.c
+++ b/lib/tst_device.c
@@ -54,25 +54,25 @@ static char dev_path[PATH_MAX];
static int device_acquired;
static unsigned long prev_dev_sec_write;
-static const char *dev_variants[] = {
+static const char *dev_loop_variants[] = {
"/dev/loop%i",
"/dev/loop/%i",
"/dev/block/loop%i"
};
-static int set_dev_path(int dev, char *path, size_t path_len)
+static int set_dev_loop_path(int dev, char *path, size_t path_len)
{
unsigned int i;
struct stat st;
- for (i = 0; i < ARRAY_SIZE(dev_variants); i++) {
- snprintf(path, path_len, dev_variants[i], dev);
+ for (i = 0; i < ARRAY_SIZE(dev_loop_variants); i++) {
+ snprintf(path, path_len, dev_loop_variants[i], dev);
if (stat(path, &st) == 0 && S_ISBLK(st.st_mode))
- return 1;
+ return 0;
}
- return 0;
+ return 1;
}
int tst_find_free_loopdev(char *path, size_t path_len)
@@ -88,8 +88,8 @@ int tst_find_free_loopdev(char *path, size_t path_len)
rc = ioctl(ctl_fd, LOOP_CTL_GET_FREE);
close(ctl_fd);
if (rc >= 0) {
- if (path)
- set_dev_path(rc, path, path_len);
+ if (!path || set_dev_loop_path(rc, path, path_len) != 0)
+ tst_brkm(TBROK, NULL, "Could not stat loop device %i", rc);
tst_resm(TINFO, "Found free device %d '%s'",
rc, path ?: "");
return rc;
@@ -116,7 +116,7 @@ int tst_find_free_loopdev(char *path, size_t path_len)
*/
for (i = 0; i < 256; i++) {
- if (!set_dev_path(i, buf, sizeof(buf)))
+ if (set_dev_loop_path(i, buf, sizeof(buf)) != 0)
continue;
dev_fd = open(buf, O_RDONLY);
--
2.40.0.rc1.284.g88254d51c5-goog
--
Mailing list info: https://lists.linux.it/listinfo/ltp
next prev parent reply other threads:[~2023-03-20 22:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-20 22:37 [LTP] [PATCH v1 0/3] tst_device.c: Handle Android path for backing device Edward Liaw via ltp
2023-03-20 22:37 ` [LTP] [PATCH v1 1/3] tst_device.c: Use PATH_MAX more consistently Edward Liaw via ltp
2023-03-20 22:37 ` Edward Liaw via ltp [this message]
2023-03-20 22:37 ` [LTP] [PATCH v1 3/3] tst_find_backing_dev: Also check /dev/block/ for backing device Edward Liaw via ltp
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