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dm: Fix concurrent acrn-dm hugetlb init race

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During init of hugetlb we check and create /run/hugepage/acrn folder.
Concurrent acrn-dm instances might race between the time of check and
create.

This commit ignore EEXIST error when creating directory.

Tracked-On: #8764
Signed-off-by: Yifan Liu <yifan1.liu@intel.com>
This commit is contained in:
Yifan Liu 2024-09-24 11:47:52 +08:00 committed by acrnsi-robot
parent bff0493d25
commit 11d7c0dcb3
1 changed files with 7 additions and 2 deletions
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9
devicemodel/core/hugetlb.c
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@ -555,8 +555,13 @@ bool init_hugetlb(void)
path[i] = 0;
if (access(path, F_OK) != 0) {
if (mkdir(path, 0755) < 0) {
pr_err("mkdir %s failed.\n", path);
return -1;
/* We might have multiple acrn-dm instances booting VMs at
* the same time
*/
if (errno != EEXIST) {
pr_err("mkdir %s failed: %s\n", path, errormsg(errno));
return false;
}
}
}
path[i] = '/';