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devices: don't use deleted loop backing file for device id

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check for "(deleted)" in the backing_file string and
fall back to devname for id.

$ cat /sys/block/loop0/loop/backing_file
/root/looptmp (deleted)
This commit is contained in:
David Teigland 2021-06-08 12:16:06 -05:00
parent 5e17203ff5
commit ca930bd936
1 changed files with 5 additions and 1 deletions
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6
lib/device/device_id.c
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@ -325,8 +325,12 @@ const char *device_id_system_read(struct cmd_context *cmd, struct device *dev, u
else if (idtype == DEV_ID_TYPE_MD_UUID)
_read_sys_block(cmd, dev, "md/uuid", sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_LOOP_FILE)
else if (idtype == DEV_ID_TYPE_LOOP_FILE) {
_read_sys_block(cmd, dev, "loop/backing_file", sysbuf, sizeof(sysbuf));
/* if backing file is deleted, fall back to devname */
if (strstr(sysbuf, "(deleted)"))
sysbuf[0] = '\0';
}
else if (idtype == DEV_ID_TYPE_DEVNAME) {
if (!(idname = strdup(dev_name(dev))))