?? iotype.c
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/* * Manager for various I/O types. * (C) 2004 - 2005 FUJITA Tomonori <tomof@acm.org> * This code is licenced under the GPL. */#include "iscsi.h"#include "iotype.h"#include "iscsi_dbg.h"static LIST_HEAD(iotypes);static rwlock_t iotypes_lock = RW_LOCK_UNLOCKED;static struct iotype *find_iotype(const char *name){ struct iotype *iot = NULL; list_for_each_entry(iot, &iotypes, iot_list) { if (strcmp(iot->name, name) == 0) return iot; } return NULL;}struct iotype *get_iotype(const char *name){ struct iotype *iot; read_lock(&iotypes_lock); iot = find_iotype(name); read_unlock(&iotypes_lock); return iot;}void put_iotype(struct iotype *iot){ if (!iot) return; return;}static int register_iotype(struct iotype *iot){ int err = 0; struct iotype *p; write_lock(&iotypes_lock); if ((p = find_iotype(iot->name))) err = -EBUSY; else list_add_tail(&iot->iot_list, &iotypes); write_unlock(&iotypes_lock); return err;}static int unregister_iotype(struct iotype *iot){ int err = 0; struct iotype *p; write_lock(&iotypes_lock); p = find_iotype(iot->name); if (p && p == iot) list_del_init(&iot->iot_list); else err = -EINVAL; write_unlock(&iotypes_lock); return err;}struct iotype *iotype_array[] = { &fileio, &nullio,};int iotype_init(void){ int i, err; for (i = 0; i < ARRAY_SIZE(iotype_array); i++) { if (!(err = register_iotype(iotype_array[i]))) eprintk("register %s\n", iotype_array[i]->name); else { eprintk("failed to register %s\n", iotype_array[i]->name); break; } } return err;}void iotype_exit(void){ int i; for (i = 0; i < ARRAY_SIZE(iotype_array); i++) unregister_iotype(iotype_array[i]);}?? 快捷鍵說明
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