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udev: use touch_file() and limit the number of trial

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This commit is contained in:
Yu Watanabe 2021-06-02 23:36:03 +09:00
parent 286bedd7a4
commit 5733bd4862
1 changed files with 10 additions and 12 deletions
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22
src/udev/udev-node.c
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@ -30,6 +30,7 @@
#include "user-util.h"
#define LINK_UPDATE_MAX_RETRIES 128
#define TOUCH_FILE_MAX_RETRIES 128
#define UDEV_NODE_HASH_KEY SD_ID128_MAKE(b9,6a,f1,ce,40,31,44,1a,9e,19,ec,8b,ae,f3,e3,2f)
static int node_symlink(sd_device *dev, const char *node, const char *slink) {
@ -279,19 +280,16 @@ static int link_update(sd_device *dev, const char *slink_in, bool add) {
log_device_debug_errno(dev, errno, "Failed to remove %s, ignoring: %m", filename);
(void) rmdir(dirname);
} else
for (;;) {
_cleanup_close_ int fd = -1;
r = mkdir_parents(filename, 0755);
if (!IN_SET(r, 0, -ENOENT))
return r;
fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
if (fd >= 0)
} else {
for (unsigned j = 0; j < TOUCH_FILE_MAX_RETRIES; j++) {
/* This may fail with -ENOENT when the parent directory is removed during
* creating the file by another udevd worker. */
r = touch_file(filename, /* parents= */ true, USEC_INFINITY, UID_INVALID, GID_INVALID, 0444);
if (r != -ENOENT)
break;
if (errno != ENOENT)
return -errno;
}
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to create %s: %m", filename);
}
/* If the database entry is not written yet we will just do one iteration and possibly wrong symlink