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git://sourceware.org/git/lvm2.git
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b849de1d18
This should be a rare occurrence so the aim is to recover if it's straightforward to do so, otherwise just to abort the operation. If people *knowingly* change device names, they should always run vgscan afterwards. A few bytes of memory gets leaked inside a pool each time an alias has to be discarded - it's not worth restructuring the code to reuse it. More of LVM2 needs updating to pass device objects (or uuids) about instead of pathnames so that resolution of pathname->object only happens once per operation. dev_cache_get() should now always return the *current* device at the path given dev_name_confirmed() replaces dev_name() whenever it's important to know that name for the device is still current (ie when opening it). If the cache doesn't know a current name, the function fails. dev_open() guarantees that the file descriptor returned is for the dev_t of the device structure it was passed.
59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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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 "lvm-types.h"
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#include "list.h"
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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 list aliases; /* struct str_list from lvm-types.h */
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dev_t dev;
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/* private */
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int fd;
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};
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struct device_list {
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struct list list;
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struct device *dev;
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};
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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_size(struct device *dev, uint64_t *size);
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int dev_get_sectsize(struct device *dev, uint32_t *size);
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int dev_open(struct device *dev, int flags);
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int dev_close(struct device *dev);
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int64_t dev_read(struct device *dev,
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uint64_t offset, int64_t len, void *buffer);
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int64_t dev_write(struct device *dev,
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uint64_t offset, int64_t len, void *buffer);
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int dev_zero(struct device *dev, uint64_t offset, int64_t len);
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static inline const char *dev_name(struct device *dev) {
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return list_item(dev->aliases.n, struct str_list)->str;
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}
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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);
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static inline int is_lvm_partition(const char *name) {
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return 1;
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}
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#endif
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