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9048565093
related to config settings:
obtain_device_info_from_udev (controls if lvm gets
a list of devices from readdir /dev or from libudev)
external_device_info_source (controls if lvm asks
libudev for device information)
. Make the obtain_device_list_from_udev setting
affect only the choice of readdir /dev vs libudev.
The setting no longer controls if udev is used for
device type checks.
. Change obtain_device_list_from_udev default to 0.
This helps avoid boot timeouts due to slow libudev
queries, avoids reported failures from
udev_enumerate_scan_devices, and avoids delays from
"device not initialized in udev database" errors.
Even without errors, for a system booting with 1024 PVs,
lvm2-pvscan times improve from about 100 sec to 15 sec,
and the pvscan command from about 64 sec to about 4 sec.
. For external_device_info_source="none", remove all
libudev device info queries, and use only lvm
native device info.
. For external_device_info_source="udev", first check
lvm native device info, then check libudev info.
. Remove sleep/retry loop when attempting libudev
queries for device info. udev info will simply
be skipped if it's not immediately available.
. Only set up a libdev connection if it will be used by
obtain_device_list_from_udev/external_device_info_source.
. For native multipath component detection, use
/etc/multipath/wwids. If a device has a wwid
matching an entry in the wwids file, then it's
considered a multipath component. This is
necessary to natively detect multipath
components when the mpath device is not set up.
212 lines
6.9 KiB
C
212 lines
6.9 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_DEVICE_H
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#define _LVM_DEVICE_H
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#include "lib/uuid/uuid.h"
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#include <fcntl.h>
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#define DEV_REGULAR 0x00000002 /* Regular file? */
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#define DEV_ALLOCED 0x00000004 /* malloc used */
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#define DEV_OPENED_RW 0x00000008 /* Opened RW */
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#define DEV_OPENED_EXCL 0x00000010 /* Opened EXCL */
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#define DEV_O_DIRECT 0x00000020 /* Use O_DIRECT */
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#define DEV_O_DIRECT_TESTED 0x00000040 /* DEV_O_DIRECT is reliable */
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#define DEV_OPEN_FAILURE 0x00000080 /* Has last open failed? */
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#define DEV_USED_FOR_LV 0x00000100 /* Is device used for an LV */
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#define DEV_ASSUMED_FOR_LV 0x00000200 /* Is device assumed for an LV */
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#define DEV_NOT_O_NOATIME 0x00000400 /* Don't use O_NOATIME */
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#define DEV_IN_BCACHE 0x00000800 /* dev fd is open and used in bcache */
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#define DEV_BCACHE_EXCL 0x00001000 /* bcache_fd should be open EXCL */
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#define DEV_FILTER_AFTER_SCAN 0x00002000 /* apply filter after bcache has data */
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#define DEV_FILTER_OUT_SCAN 0x00004000 /* filtered out during label scan */
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#define DEV_BCACHE_WRITE 0x00008000 /* bcache_fd is open with RDWR */
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#define DEV_SCAN_FOUND_LABEL 0x00010000 /* label scan read dev and found label */
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#define DEV_IS_MD_COMPONENT 0x00020000 /* device is an md component */
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#define DEV_IS_NVME 0x00040000 /* set if dev is nvme */
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#define DEV_MATCHED_USE_ID 0x00080000 /* matched an entry from cmd->use_devices */
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/*
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* Support for external device info.
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* Any new external device info source needs to be
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* registered using EXT_REGISTER macro in dev-ext.c.
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*/
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typedef enum dev_ext_e {
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DEV_EXT_NONE,
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DEV_EXT_UDEV,
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DEV_EXT_NUM
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} dev_ext_t;
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struct dev_ext {
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int enabled;
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dev_ext_t src;
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void *handle;
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};
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#define DEV_ID_TYPE_SYS_WWID 0x0001
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#define DEV_ID_TYPE_SYS_SERIAL 0x0002
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#define DEV_ID_TYPE_MPATH_UUID 0x0003
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#define DEV_ID_TYPE_MD_UUID 0x0004
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#define DEV_ID_TYPE_LOOP_FILE 0x0005
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#define DEV_ID_TYPE_CRYPT_UUID 0x0006
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#define DEV_ID_TYPE_LVMLV_UUID 0x0007
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#define DEV_ID_TYPE_DEVNAME 0x0008
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/*
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* A device ID of a certain type for a device.
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* A struct device may have multiple dev_id structs on dev->ids.
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* One of them will be the one that's used, pointed to by dev->id.
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*/
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struct dev_id {
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struct dm_list list;
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struct device *dev;
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uint16_t idtype; /* DEV_ID_TYPE_ */
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char *idname; /* id string determined by idtype */
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};
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/*
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* A device listed in devices file that lvm should use.
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* Each entry in the devices file is represented by a struct dev_use.
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* The structs are kept on cmd->use_devices.
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* idtype/idname/pvid/part are set when reading the devices file.
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* du->dev is set when a struct dev_use is matched to a struct device.
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*/
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struct dev_use {
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struct dm_list list;
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struct device *dev;
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int part;
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uint16_t idtype;
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char *idname;
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char *devname;
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char *pvid;
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};
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/*
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* All devices in LVM will be represented by one of these.
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* pointer comparisons are valid.
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*/
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struct device {
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struct dm_list aliases; /* struct dm_str_list */
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struct dm_list ids; /* struct dev_id, different entries for different idtypes */
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struct dev_id *id; /* points to the the ids entry being used for this dev */
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dev_t dev;
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/* private */
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int fd;
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int open_count;
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int physical_block_size; /* From BLKPBSZGET: lowest possible sector size that the hardware can operate on without reverting to read-modify-write operations */
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int logical_block_size; /* From BLKSSZGET: lowest possible block size that the storage device can address */
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int read_ahead;
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int bcache_fd;
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int bcache_di;
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int part; /* partition number */
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uint32_t flags;
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uint32_t filtered_flags;
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unsigned size_seqno;
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uint64_t size;
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uint64_t end;
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struct dev_ext ext;
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const char *duplicate_prefer_reason;
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const char *vgid; /* if device is an LV */
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const char *lvid; /* if device is an LV */
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char pvid[ID_LEN + 1]; /* if device is a PV */
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char _padding[7];
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};
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/*
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* All I/O is annotated with the reason it is performed.
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*/
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typedef enum dev_io_reason {
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DEV_IO_SIGNATURES = 0, /* Scanning device signatures */
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DEV_IO_LABEL, /* LVM PV disk label */
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DEV_IO_MDA_HEADER, /* Text format metadata area header */
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DEV_IO_MDA_CONTENT, /* Text format metadata area content */
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DEV_IO_MDA_EXTRA_HEADER, /* Header of any extra metadata areas on device */
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DEV_IO_MDA_EXTRA_CONTENT, /* Content of any extra metadata areas on device */
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DEV_IO_FMT1, /* Original LVM1 metadata format */
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DEV_IO_POOL, /* Pool metadata format */
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DEV_IO_LV, /* Content written to an LV */
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DEV_IO_LOG /* Logging messages */
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} dev_io_reason_t;
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struct device_list {
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struct dm_list list;
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struct device *dev;
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};
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struct device_area {
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struct device *dev;
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uint64_t start; /* Bytes */
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uint64_t size; /* Bytes */
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};
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/*
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* Support for external device info.
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*/
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const char *dev_ext_name(struct device *dev);
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int dev_ext_enable(struct device *dev, dev_ext_t src);
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int dev_ext_disable(struct device *dev);
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struct dev_ext *dev_ext_get(struct device *dev);
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int dev_ext_release(struct device *dev);
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/*
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* Increment current dev_size_seqno.
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* This is used to control lifetime
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* of cached device size.
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*/
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void dev_size_seqno_inc(void);
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/*
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* All io should use these routines.
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*/
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int dev_get_direct_block_sizes(struct device *dev, unsigned int *physical_block_size,
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unsigned int *logical_block_size);
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int dev_get_size(struct device *dev, uint64_t *size);
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int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead);
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int dev_discard_blocks(struct device *dev, uint64_t offset_bytes, uint64_t size_bytes);
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/* Use quiet version if device number could change e.g. when opening LV */
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int dev_open(struct device *dev);
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int dev_open_quiet(struct device *dev);
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int dev_open_flags(struct device *dev, int flags, int direct, int quiet);
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int dev_open_readonly(struct device *dev);
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int dev_open_readonly_buffered(struct device *dev);
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int dev_open_readonly_quiet(struct device *dev);
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int dev_close(struct device *dev);
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int dev_close_immediate(struct device *dev);
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int dev_fd(struct device *dev);
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const char *dev_name(const struct device *dev);
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void dev_flush(struct device *dev);
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struct device *dev_create_file(const char *filename, struct device *dev,
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struct dm_str_list *alias, int use_malloc);
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void dev_destroy_file(struct device *dev);
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/* Return a valid device name from the alias list; NULL otherwise */
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const char *dev_name_confirmed(struct device *dev, int quiet);
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int dev_mpath_init(const char *config_wwids_file);
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void dev_mpath_exit(void);
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#endif
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