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devices: simplify dev_cache_get_by_devt

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remove unused args, and no callers need or want a
repeated dev_cache_scan if there is no dev from the
lookup.
This commit is contained in:
David Teigland 2022-02-24 15:57:29 -06:00
parent ac1f4bbbfd
commit 1126be8f8d
3 changed files with 9 additions and 59 deletions
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60
lib/device/dev-cache.c
View File

@ -1577,63 +1577,13 @@ struct device *dev_cache_get(struct cmd_context *cmd, const char *name, struct d
return dev;
}
struct device *dev_cache_get_by_devt(struct cmd_context *cmd, dev_t dev, struct dev_filter *f, int *filtered)
struct device *dev_cache_get_by_devt(struct cmd_context *cmd, dev_t devt)
{
char path[PATH_MAX];
const char *sysfs_dir;
struct stat info;
struct device *d = (struct device *) btree_lookup(_cache.devices, (uint32_t) dev);
int ret;
if (filtered)
*filtered = 0;
if (!d) {
sysfs_dir = dm_sysfs_dir();
if (sysfs_dir && *sysfs_dir) {
/* First check if dev is sysfs to avoid useless scan */
if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d",
sysfs_dir, (int)MAJOR(dev), (int)MINOR(dev)) < 0) {
log_error("dm_snprintf partition failed.");
return NULL;
}
if (lstat(path, &info)) {
log_debug("No sysfs entry for %d:%d errno %d at %s.",
(int)MAJOR(dev), (int)MINOR(dev), errno, path);
return NULL;
}
}
log_debug_devs("Device num not found in dev_cache repeat dev_cache_scan for %d:%d",
(int)MAJOR(dev), (int)MINOR(dev));
dev_cache_scan(cmd);
d = (struct device *) btree_lookup(_cache.devices, (uint32_t) dev);
if (!d)
return NULL;
}
if (d->flags & DEV_REGULAR)
return d;
if (!f)
return d;
ret = f->passes_filter(cmd, f, d, NULL);
if (ret == -EAGAIN) {
log_debug_devs("get device by number defer filter %s", dev_name(d));
d->flags |= DEV_FILTER_AFTER_SCAN;
ret = 1;
}
if (ret)
return d;
if (filtered)
*filtered = 1;
struct device *dev = (struct device *) btree_lookup(_cache.devices, (uint32_t) devt);
if (dev)
return dev;
log_debug_devs("No devno %d:%d in dev cache.", (int)MAJOR(devt), (int)MINOR(devt));
return NULL;
}

2
lib/device/dev-cache.h
View File

@ -54,7 +54,7 @@ int dev_cache_has_scanned(void);
int dev_cache_add_dir(const char *path);
struct device *dev_cache_get(struct cmd_context *cmd, const char *name, struct dev_filter *f);
struct device *dev_cache_get_by_devt(struct cmd_context *cmd, dev_t device, struct dev_filter *f, int *filtered);
struct device *dev_cache_get_by_devt(struct cmd_context *cmd, dev_t devt);
struct device *dev_hash_get(const char *name);

6
lib/label/label.c
View File

@ -1134,7 +1134,7 @@ int label_scan_vg_online(struct cmd_context *cmd, const char *vgname,
dm_list_iterate_items(po, &pvs_online) {
if (po->dev)
continue;
if (!(po->dev = dev_cache_get_by_devt(cmd, po->devno, NULL, NULL))) {
if (!(po->dev = dev_cache_get_by_devt(cmd, po->devno))) {
log_error("No device found for %d:%d PVID %s",
(int)MAJOR(po->devno), (int)MINOR(po->devno), po->pvid);
goto bad;
@ -1722,7 +1722,7 @@ void label_scan_invalidate_lv(struct cmd_context *cmd, struct logical_volume *lv
if (lv_info(cmd, lv, 0, &lvinfo, 0, 0) && lvinfo.exists) {
/* FIXME: Still unclear what is it supposed to find */
devt = MKDEV(lvinfo.major, lvinfo.minor);
if ((dev = dev_cache_get_by_devt(cmd, devt, NULL, NULL)))
if ((dev = dev_cache_get_by_devt(cmd, devt)))
label_scan_invalidate(dev);
}
}
@ -1742,7 +1742,7 @@ void label_scan_invalidate_lvs(struct cmd_context *cmd, struct dm_list *lvs)
if (dm_dev->uuid &&
strncmp(dm_dev->uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1) == 0) {
devt = MKDEV(dm_dev->major, dm_dev->minor);
if ((dev = dev_cache_get_by_devt(cmd, devt, NULL, NULL)))
if ((dev = dev_cache_get_by_devt(cmd, devt)))
label_scan_invalidate(dev);
}
/* ATM no further caching for any lvconvert command