/* * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. * Copyright (C) 2004-2007 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 */ #ifndef _LVM_DEVICE_H #define _LVM_DEVICE_H #include "lib/uuid/uuid.h" #include #define DEV_REGULAR 0x00000002 /* Regular file? */ #define DEV_ALLOCED 0x00000004 /* malloc used */ #define DEV_OPENED_RW 0x00000008 /* Opened RW */ #define DEV_OPENED_EXCL 0x00000010 /* Opened EXCL */ #define DEV_O_DIRECT 0x00000020 /* Use O_DIRECT */ #define DEV_O_DIRECT_TESTED 0x00000040 /* DEV_O_DIRECT is reliable */ #define DEV_OPEN_FAILURE 0x00000080 /* Has last open failed? */ #define DEV_USED_FOR_LV 0x00000100 /* Is device used for an LV */ #define DEV_ASSUMED_FOR_LV 0x00000200 /* Is device assumed for an LV */ #define DEV_NOT_O_NOATIME 0x00000400 /* Don't use O_NOATIME */ #define DEV_IN_BCACHE 0x00000800 /* dev fd is open and used in bcache */ #define DEV_BCACHE_EXCL 0x00001000 /* bcache_fd should be open EXCL */ #define DEV_FILTER_AFTER_SCAN 0x00002000 /* apply filter after bcache has data */ #define DEV_FILTER_OUT_SCAN 0x00004000 /* filtered out during label scan */ #define DEV_BCACHE_WRITE 0x00008000 /* bcache_fd is open with RDWR */ #define DEV_SCAN_FOUND_LABEL 0x00010000 /* label scan read dev and found label */ #define DEV_IS_MD_COMPONENT 0x00020000 /* device is an md component */ #define DEV_UDEV_INFO_MISSING 0x00040000 /* we have no udev info for this device */ #define DEV_IS_NVME 0x00080000 /* set if dev is nvme */ #define DEV_MATCHED_USE_ID 0x00100000 /* matched an entry from cmd->use_devices */ /* * Support for external device info. * Any new external device info source needs to be * registered using EXT_REGISTER macro in dev-ext.c. */ typedef enum dev_ext_e { DEV_EXT_NONE, DEV_EXT_UDEV, DEV_EXT_NUM } dev_ext_t; struct dev_ext { int enabled; dev_ext_t src; void *handle; }; #define DEV_ID_TYPE_SYS_WWID 0x0001 #define DEV_ID_TYPE_SYS_SERIAL 0x0002 #define DEV_ID_TYPE_MPATH_UUID 0x0003 #define DEV_ID_TYPE_MD_UUID 0x0004 #define DEV_ID_TYPE_LOOP_FILE 0x0005 #define DEV_ID_TYPE_CRYPT_UUID 0x0006 #define DEV_ID_TYPE_LVMLV_UUID 0x0007 #define DEV_ID_TYPE_DEVNAME 0x0008 /* * A device ID of a certain type for a device. * A struct device may have multiple dev_id structs on dev->ids. * One of them will be the one that's used, pointed to by dev->id. */ struct dev_id { struct dm_list list; struct device *dev; uint16_t idtype; /* DEV_ID_TYPE_ */ char *idname; /* id string determined by idtype */ }; /* * A device listed in devices file that lvm should use. * Each entry in the devices file is represented by a struct dev_use. * The structs are kept on cmd->use_devices. * idtype/idname/pvid/part are set when reading the devices file. * du->dev is set when a struct dev_use is matched to a struct device. */ struct dev_use { struct dm_list list; struct device *dev; int part; uint16_t idtype; char *idname; char *devname; char *pvid; }; /* * All devices in LVM will be represented by one of these. * pointer comparisons are valid. */ struct device { struct dm_list aliases; /* struct dm_str_list */ struct dm_list ids; /* struct dev_id, different entries for different idtypes */ struct dev_id *id; /* points to the the ids entry being used for this dev */ dev_t dev; /* private */ int fd; int open_count; int physical_block_size; /* From BLKPBSZGET: lowest possible sector size that the hardware can operate on without reverting to read-modify-write operations */ int logical_block_size; /* From BLKSSZGET: lowest possible block size that the storage device can address */ int read_ahead; int bcache_fd; int bcache_di; int part; /* partition number */ uint32_t flags; uint32_t filtered_flags; unsigned size_seqno; uint64_t size; uint64_t end; struct dev_ext ext; const char *duplicate_prefer_reason; const char *vgid; /* if device is an LV */ const char *lvid; /* if device is an LV */ char pvid[ID_LEN + 1]; /* if device is a PV */ char _padding[7]; }; /* * All I/O is annotated with the reason it is performed. */ typedef enum dev_io_reason { DEV_IO_SIGNATURES = 0, /* Scanning device signatures */ DEV_IO_LABEL, /* LVM PV disk label */ DEV_IO_MDA_HEADER, /* Text format metadata area header */ DEV_IO_MDA_CONTENT, /* Text format metadata area content */ DEV_IO_MDA_EXTRA_HEADER, /* Header of any extra metadata areas on device */ DEV_IO_MDA_EXTRA_CONTENT, /* Content of any extra metadata areas on device */ DEV_IO_FMT1, /* Original LVM1 metadata format */ DEV_IO_POOL, /* Pool metadata format */ DEV_IO_LV, /* Content written to an LV */ DEV_IO_LOG /* Logging messages */ } dev_io_reason_t; struct device_list { struct dm_list list; struct device *dev; }; struct device_area { struct device *dev; uint64_t start; /* Bytes */ uint64_t size; /* Bytes */ }; /* * Support for external device info. */ const char *dev_ext_name(struct device *dev); int dev_ext_enable(struct device *dev, dev_ext_t src); int dev_ext_disable(struct device *dev); struct dev_ext *dev_ext_get(struct device *dev); int dev_ext_release(struct device *dev); /* * Increment current dev_size_seqno. * This is used to control lifetime * of cached device size. */ void dev_size_seqno_inc(void); /* * All io should use these routines. */ int dev_get_direct_block_sizes(struct device *dev, unsigned int *physical_block_size, unsigned int *logical_block_size); int dev_get_size(struct device *dev, uint64_t *size); int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead); int dev_discard_blocks(struct device *dev, uint64_t offset_bytes, uint64_t size_bytes); /* Use quiet version if device number could change e.g. when opening LV */ int dev_open(struct device *dev); int dev_open_quiet(struct device *dev); int dev_open_flags(struct device *dev, int flags, int direct, int quiet); int dev_open_readonly(struct device *dev); int dev_open_readonly_buffered(struct device *dev); int dev_open_readonly_quiet(struct device *dev); int dev_close(struct device *dev); int dev_close_immediate(struct device *dev); int dev_fd(struct device *dev); const char *dev_name(const struct device *dev); void dev_flush(struct device *dev); struct device *dev_create_file(const char *filename, struct device *dev, struct dm_str_list *alias, int use_malloc); void dev_destroy_file(struct device *dev); /* Return a valid device name from the alias list; NULL otherwise */ const char *dev_name_confirmed(struct device *dev, int quiet); #endif