diff options
Diffstat (limited to 'tools/lvmdevices.c')
| -rw-r--r-- | tools/lvmdevices.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/tools/lvmdevices.c b/tools/lvmdevices.c new file mode 100644 index 000000000..87e6d9dae --- /dev/null +++ b/tools/lvmdevices.c @@ -0,0 +1,319 @@ +/* + * Copyright (C) 2020 Red Hat, Inc. All rights reserved. + * + * This file is part of LVM2. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU Lesser General Public License v.2.1. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "tools.h" +#include "lib/cache/lvmcache.h" +#include "lib/filters/filter.h" +#include "lib/device/device_id.h" + +int lvmdevices(struct cmd_context *cmd, int argc, char **argv) +{ + struct device *dev; + struct use_id *uid; + + if (!setup_devices_file(cmd)) + return ECMD_FAILED; + + if (!cmd->enable_devices_file) { + log_error("Devices file not enabled."); + return ECMD_FAILED; + } + + if (arg_is_set(cmd, update_ARG) || + arg_is_set(cmd, adddev_ARG) || arg_is_set(cmd, deldev_ARG) || + arg_is_set(cmd, addpvid_ARG) || arg_is_set(cmd, delpvid_ARG)) { + if (!lock_devices_file(cmd, LOCK_EX)) { + log_error("Failed to lock the devices file to create."); + return ECMD_FAILED; + } + if (!devices_file_exists(cmd)) { + if (!devices_file_touch(cmd)) { + log_error("Failed to create the devices file."); + return ECMD_FAILED; + } + } + + /* + * The hint file is associated with the default/system devices file, + * so don't clear hints when using a different --devicesfile. + */ + if (!cmd->devicesfile) + clear_hint_file(cmd); + } else { + if (!lock_devices_file(cmd, LOCK_SH)) { + log_error("Failed to lock the devices file."); + return ECMD_FAILED; + } + if (!devices_file_exists(cmd)) { + log_error("Devices file does not exist."); + return ECMD_FAILED; + } + } + + if (!device_ids_read(cmd)) { + log_error("Failed to read the devices file."); + return ECMD_FAILED; + } + dev_cache_scan(); + device_ids_match(cmd); + + if (arg_is_set(cmd, check_ARG)) { + /* For each cmd->use_device_ids: + reads pvid from header, sets dev->pvid and uid->pvid */ + label_scan_setup_bcache(); + device_ids_read_pvids(cmd); + goto out; + } + + if (arg_is_set(cmd, update_ARG)) { + /* For each cmd->use_device_ids: + reads pvid from header, sets dev->pvid and uid->pvid */ + label_scan_setup_bcache(); + device_ids_read_pvids(cmd); + + /* Any uid fields found/set/fixed will be written. */ + if (!device_ids_write(cmd)) + goto_bad; + goto out; + } + + if (arg_is_set(cmd, adddev_ARG)) { + const char *devname; + + if (!(devname = arg_str_value(cmd, adddev_ARG, NULL))) + goto_bad; + + /* + * addev will add a device to devices_file even if that device + * is excluded by filters. + */ + + /* + * No filter applied here (only the non-data filters would + * be applied since we haven't read the device yet. + */ + if (!(dev = dev_cache_get(cmd, devname, NULL))) { + log_error("No device found for %s.", devname); + goto_bad; + } + + /* + * reads pvid from dev header, sets dev->pvid. + * (it's ok if the device is not a PV and has no PVID) + */ + label_scan_setup_bcache(); + device_id_read_pvid(cmd, dev); + + /* + * Allow filtered devices to be added to devices_file, but + * check if it's excluded by filters to print a warning. + * Since device_id_read_pvid has read the first 4K of the device, + * the filters should not for the most part need to do any further + * reading of the device. + * + * (This is the first time filters are being run, so we do + * not need to wipe filters of any previous result that was + * based on filter_deviceid_skip=0.) + */ + cmd->filter_deviceid_skip = 1; + cmd->filter_regex_with_devices_file = 1; + + if (!cmd->filter->passes_filter(cmd, cmd->filter, dev, NULL)) { + /* FIXME: print which filters */ + log_warn("WARNING: %s is currently excluded by filters.", dev_name(dev)); + } + + if (!device_id_add(cmd, dev, dev->pvid, + arg_str_value(cmd, deviceidtype_ARG, NULL), + arg_str_value(cmd, deviceid_ARG, NULL))) + goto_bad; + if (!device_ids_write(cmd)) + goto_bad; + goto out; + } + + if (arg_is_set(cmd, addpvid_ARG)) { + struct dev_iter *iter; + const char *pvid; + struct device_list *devl, *safe; + struct dm_list devs; + + dm_list_init(&devs); + + /* + * Iterate through all devs on the system, reading the + * pvid of each to check if it has this pvid. + * Devices that are excluded by no-data filters will not + * be checked for the PVID. + * addpvid will not add a device to devices_file if it's + * excluded by filters. + */ + + pvid = arg_str_value(cmd, addpvid_ARG, NULL); + + if ((uid = get_uid_for_pvid(cmd, pvid))) { + log_error("PVID already exists in devices_file for %s.", dev_name(uid->dev)); + goto bad; + } + + /* + * Create a list of all devices on the system, without applying + * any filters, since we do not want filters to read any of the + * devices yet. + */ + if (!(iter = dev_iter_create(NULL, 0))) + goto_bad; + while ((dev = dev_iter_get(cmd, iter))) { + if (!(devl = zalloc(sizeof(*devl)))) + continue; + devl->dev = dev; + dm_list_add(&devs, &devl->list); + } + dev_iter_destroy(iter); + + /* + * Apply the filters that do not require reading the devices + * (bcache is not set up yet, so any filter that requires + * reading the device will return EAGAIN.) The regex filter + * will be used and filter-deviceid not used. + */ + log_debug("Filtering devices without data"); + cmd->filter_deviceid_skip = 1; + cmd->filter_regex_with_devices_file = 1; + dm_list_iterate_items_safe(devl, safe, &devs) { + if (!cmd->filter->passes_filter(cmd, cmd->filter, devl->dev, NULL)) + dm_list_del(&devl->list); + } + + label_scan_setup_bcache(); + dev = NULL; + dm_list_iterate_items(devl, &devs) { + if (!device_id_read_pvid(cmd, devl->dev)) + continue; + if (!strcmp(devl->dev->pvid, pvid)) { + dev = devl->dev; + break; + } + } + + if (!dev) { + log_error("PVID %s not found on any devices.", pvid); + goto bad; + } + + /* + * Now that the device has been read, apply the filters again + * which will now include filters that read data from the device. + * N.B. we've already skipped devs that were excluded by the + * no-data filters, so if the PVID exists on one of those devices + * no warning is printed. + */ + log_debug("Filtering device with data"); + cmd->filter_deviceid_skip = 1; + cmd->filter_regex_with_devices_file = 1; + cmd->filter->wipe(cmd, cmd->filter, dev, NULL); + if (!cmd->filter->passes_filter(cmd, cmd->filter, dev, NULL)) { + /* FIXME: print which filters */ + log_error("PVID %s found on %s which is excluded by filters", + pvid, dev_name(dev)); + goto_bad; + } + + if (!device_id_add(cmd, dev, dev->pvid, NULL, NULL)) + goto_bad; + if (!device_ids_write(cmd)) + goto_bad; + goto out; + } + + if (arg_is_set(cmd, deldev_ARG)) { + const char *devname; + + if (!(devname = arg_str_value(cmd, deldev_ARG, NULL))) + goto_bad; + + /* we don't need to filter_deviceid_skip since we're + removing a dev from devices_file, that dev should + be in the devices_file and pass the filter */ + if (!(dev = dev_cache_get(cmd, devname, cmd->filter))) { + log_error("No device found for %s.", devname); + goto bad; + } + + /* dev_cache_scan uses sysfs to check if an LV is using each dev + and sets this flag is so. */ + if (dev->flags & DEV_USED_FOR_LV) { + if (!arg_count(cmd, yes_ARG) && + yes_no_prompt("Device %s is used by an active LV, continue to remove? ", devname) == 'n') { + log_error("Device not removed."); + goto bad; + } + } + + if (!(uid = get_uid_for_dev(cmd, dev))) { + log_error("Device not found in devices_file."); + goto bad; + } + + dm_list_del(&uid->list); + free_uid(uid); + device_ids_write(cmd); + goto out; + } + + if (arg_is_set(cmd, delpvid_ARG)) { + const char *pvid; + + pvid = arg_str_value(cmd, delpvid_ARG, NULL); + + if (!(uid = get_uid_for_pvid(cmd, pvid))) { + log_error("PVID not found in devices_file."); + goto_bad; + } + + if (uid->devname && (uid->devname[0] != '.')) { + if ((dev = dev_cache_get(cmd, uid->devname, cmd->filter)) && + (dev->flags & DEV_USED_FOR_LV)) { + if (!arg_count(cmd, yes_ARG) && + yes_no_prompt("Device %s is used by an active LV, continue to remove? ", uid->devname) == 'n') { + log_error("Device not removed."); + goto bad; + } + } + } + + dm_list_del(&uid->list); + free_uid(uid); + device_ids_write(cmd); + goto out; + } + + /* If no options, print use_device_ids list */ + + dm_list_iterate_items(uid, &cmd->use_device_ids) { + log_print("Device %s IDTYPE=%s IDNAME=%s DEVNAME=%s PVID=%s", + uid->dev ? dev_name(uid->dev) : ".", + uid->idtype ? idtype_to_str(uid->idtype) : ".", + uid->idname ? uid->idname : ".", + uid->devname ? uid->devname : ".", + uid->pvid ? (char *)uid->pvid : "."); + } + +out: + return ECMD_PROCESSED; + +bad: + return ECMD_FAILED; +} + |