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79e67fc5e4
The new device_id types are: wwid_naa, wwid_eui, wwid_t10. The new types use the specific wwid type in their name. lvm currently gets the values for these types by reading the device's vpd_pg83 sysfs file (this could change in the future if better methods become available for reading the values.) If a device is added to the devices file using one of these types, prior versions of lvm will not recognize the types and will be unable to use the devices. When adding a new device, lvm continues to first use sys_wwid from the sysfs wwid file. If the device has no sysfs wwid file, lvm now attempts to use one of the new types from vpd_pg83. If a devices file entry with type sys_wwid does not match a given device's sysfs wwid file, the sys_wwid value will also be compared to that device's other wwids from its vpd_pg83 file. If the kernel changes the wwid type reported from the sysfs wwid file, e.g. from a device's t10 id to its naa id, then lvm should still be able to match it correctly using the vpd_pg83 data which will include both ids.
233 lines
7.6 KiB
C
233 lines
7.6 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_ADDED_SYS_WWID 0x00002000 /* wwid has been added from sysfs wwid file */
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#define DEV_ADDED_VPD_WWIDS 0x00004000 /* wwids have been added from vpd_pg83 */
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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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#define DEV_SCAN_FOUND_NOLABEL 0x00100000 /* label_scan read, passed filters, but no lvm label */
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#define DEV_SCAN_NOT_READ 0x00200000 /* label_scan not able to read dev */
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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 1
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#define DEV_ID_TYPE_SYS_SERIAL 2
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#define DEV_ID_TYPE_MPATH_UUID 3
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#define DEV_ID_TYPE_MD_UUID 4
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#define DEV_ID_TYPE_LOOP_FILE 5
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#define DEV_ID_TYPE_CRYPT_UUID 6
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#define DEV_ID_TYPE_LVMLV_UUID 7
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#define DEV_ID_TYPE_DEVNAME 8
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#define DEV_ID_TYPE_WWID_NAA 9
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#define DEV_ID_TYPE_WWID_EUI 10
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#define DEV_ID_TYPE_WWID_T10 11
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/* Max length of WWID_NAA, WWID_EUI, WWID_T10 */
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#define DEV_WWID_SIZE 128
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/*
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* A wwid read from:
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* /sys/dev/block/%d:%d/device/wwid
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* /sys/dev/block/%d:%d/wwid
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* /sys/dev/block/%d:%d/device/vpd_pg83
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*/
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struct dev_wwid {
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struct dm_list list; /* dev->wwids */
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int type; /* 1,2,3 for NAA,EUI,T10 */
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char id[DEV_WWID_SIZE]; /* includes prefix naa.,eui.,t10. */
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};
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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; /* dev->ids */
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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 wwids; /* struct dev_wwid, used for multipath component detection */
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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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int dev_mpath_init(const char *config_wwids_file);
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void dev_mpath_exit(void);
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int parse_vpd_ids(const unsigned char *vpd_data, int vpd_datalen, struct dm_list *ids);
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int format_t10_id(const unsigned char *in, int in_bytes, unsigned char *out, int out_bytes);
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#endif
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