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device_id: simplify devname matching

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Handle this case directly rather than going through the
process for reading other device ids.  Also simplify
matching alternate dm devnames.
This commit is contained in:
David Teigland 2023-10-23 14:27:36 -05:00
parent 46521a46d2
commit e291178633
1 changed files with 42 additions and 38 deletions
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80
lib/device/device_id.c
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@ -1875,36 +1875,39 @@ static int _idtype_compatible_with_major_number(struct cmd_context *cmd, int idt
return 1;
}
static int _match_dm_devnames(struct cmd_context *cmd, struct device *dev,
struct dev_id *id, struct dev_use *du)
static int _match_dm_names(struct cmd_context *cmd, char *idname, struct device *dev)
{
struct device *dev2;
struct stat buf;
if (MAJOR(dev->dev) != cmd->dev_types->device_mapper_major)
return 0;
/*
* An alternate dm name may already be in dev-cache from dev_cache_scan(),
* in which case both names point to the same struct device.
*/
dev2 = dev_cache_get_existing(cmd, idname, NULL);
if (id->idname && du->idname && !strcmp(id->idname, du->idname))
return 1;
if (du->idname && !strcmp(du->idname, dev_name(dev))) {
log_debug("Match %s %s to %s: ignoring idname %s",
idtype_to_str(du->idtype), du->idname, dev_name(dev), id->idname ?: ".");
if (dev2 && (dev == dev2)) {
log_debug("Match dm names %s %s for %d:%d (from cache)",
dev_name(dev), idname, (int)MAJOR(dev->dev), (int)MINOR(dev->dev));
return 1;
}
if (!du->idname)
if (dev2)
return 0;
/* detect that a du entry is for a dm device */
if (!strncmp(du->idname, "/dev/dm-", 8) || !strncmp(du->idname, "/dev/mapper/", 12)) {
if (stat(du->idname, &buf))
/*
* Optimized commands (like pvscan) can avoid a full dev_cache_scan(),
* in which case all the dev aliases will not already exist in dev-cache,
* so check if the system has a device with the given name.
*/
if (!strncmp(idname, "/dev/dm-", 8) || !strncmp(idname, "/dev/mapper/", 12)) {
if (stat(idname, &buf))
return 0;
if ((MAJOR(buf.st_rdev) == cmd->dev_types->device_mapper_major) &&
(MINOR(buf.st_rdev) == MINOR(dev->dev))) {
log_debug("Match %s %s to %s: using other dm name, ignoring %s",
idtype_to_str(du->idtype), du->idname, dev_name(dev), id->idname ?: ".");
log_debug("Match dm names %s %s for %d:%d (from stat)",
dev_name(dev), idname, (int)MAJOR(dev->dev), (int)MINOR(dev->dev));
return 1;
}
}
@ -1975,6 +1978,27 @@ static int _match_du_to_dev(struct cmd_context *cmd, struct dev_use *du, struct
return 0;
}
if (du->idtype == DEV_ID_TYPE_DEVNAME) {
int is_dm = (MAJOR(dev->dev) == cmd->dev_types->device_mapper_major);
idname = dev_name(dev);
if (!strcmp(du->idname, idname) || (is_dm && _match_dm_names(cmd, du->idname, dev))) {
if (!(id = zalloc(sizeof(struct dev_id))))
return_0;
id->idtype = DEV_ID_TYPE_DEVNAME;
id->idname = strdup(du->idname);
id->dev = dev;
dm_list_add(&dev->ids, &id->list);
du->dev = dev;
dev->id = id;
dev->flags |= DEV_MATCHED_USE_ID;
log_debug("Match %s %s to %s",
idtype_to_str(du->idtype), du->idname, dev_name(dev));
return 1;
}
return 0;
}
/*
* sys_wwid and sys_serial were saved in the past with leading and
* trailing spaces replaced with underscores, and t10 wwids also had
@ -2011,20 +2035,6 @@ static int _match_du_to_dev(struct cmd_context *cmd, struct dev_use *du, struct
continue;
if (id->idtype == du->idtype) {
/*
* dm names can have different forms, so matching names
* is not always a direct comparison.
*/
if ((id->idtype == DEV_ID_TYPE_DEVNAME) && _match_dm_devnames(cmd, dev, id, du)) {
/* dm devs can have differing names that we know still match */
du->dev = dev;
dev->id = id;
dev->flags |= DEV_MATCHED_USE_ID;
log_debug("Match %s %s to %s: dm names",
idtype_to_str(du->idtype), du->idname, dev_name(dev));
return 1;
}
if (!strcmp(id->idname, du_idname)) {
du->dev = dev;
dev->id = id;
@ -2032,14 +2042,8 @@ static int _match_du_to_dev(struct cmd_context *cmd, struct dev_use *du, struct
log_debug("Match %s %s to %s",
idtype_to_str(du->idtype), du_idname, dev_name(dev));
return 1;
} else {
/*
log_debug("Mismatch device_id %s %s to %s: idname %s",
idtype_to_str(du->idtype), du->idname ?: ".", dev_name(dev), id->idname ?: ":");
*/
return 0;
}
return 0;
}
}