1 /* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
2 // NOLINTNEXTLINE(bugprone-reserved-identifier,cert-dcl37-c,cert-dcl51-cpp)
3 #include <libpldm/instance-id.h>
46 		return -EINVAL;  in pldm_instance_db_init()
53 		return -EINVAL;  in pldm_instance_db_init()
58 		return -EINVAL;  in pldm_instance_db_init()
63 		return -ENOMEM;  in pldm_instance_db_init()
66 	/* Initialise previous ID values so the next one is zero */  in pldm_instance_db_init()
68 		l_ctx->state[i].prev = 31;  in pldm_instance_db_init()
71 	/* Lock database may be read-only, either by permissions or mountpoint  in pldm_instance_db_init()
73 	l_ctx->lock_db_fd = open(dbpath, O_RDONLY | O_CLOEXEC);  in pldm_instance_db_init()
74 	if (l_ctx->lock_db_fd < 0) {  in pldm_instance_db_init()
76 		return -errno;  in pldm_instance_db_init()
87 				     "/usr/share/libpldm/instance-db/default");  in pldm_instance_db_init_default()
96 	close(ctx->lock_db_fd);  in pldm_instance_db_destroy()
126 		return -EINVAL;  in pldm_instance_id_alloc()
129 	l_iid = ctx->state[tid].prev;  in pldm_instance_id_alloc()
131 		return -EPROTO;  in pldm_instance_id_alloc()
134 	while ((l_iid = iid_next(l_iid)) != ctx->state[tid].prev) {  in pldm_instance_id_alloc()
139 		/* Have we already allocated this instance ID? */  in pldm_instance_id_alloc()
140 		if (ctx->state[tid].allocations & BIT(l_iid)) {  in pldm_instance_id_alloc()
144 		/* Derive the instance ID offset in the lock database */  in pldm_instance_id_alloc()
150 		rc = fcntl(ctx->lock_db_fd, F_OFD_SETLK, &flop);  in pldm_instance_id_alloc()
153 				return -EAGAIN;  in pldm_instance_id_alloc()
155 			return -EPROTO;  in pldm_instance_id_alloc()
172 		rc = fcntl(ctx->lock_db_fd, F_OFD_GETLK, &flop);  in pldm_instance_id_alloc()
175 				rc = -EAGAIN;  in pldm_instance_id_alloc()
178 			rc = -EPROTO;  in pldm_instance_id_alloc()
185 			ctx->state[tid].prev = l_iid;  in pldm_instance_id_alloc()
186 			ctx->state[tid].allocations |= BIT(l_iid);  in pldm_instance_id_alloc()
192 			rc = -EPROTO;  in pldm_instance_id_alloc()
198 		if (fcntl(ctx->lock_db_fd, F_OFD_SETLK, &flop) < 0) {  in pldm_instance_id_alloc()
200 				return -EAGAIN;  in pldm_instance_id_alloc()
202 			return -EPROTO;  in pldm_instance_id_alloc()
212 	return -EAGAIN;  in pldm_instance_id_alloc()
224 		return -EINVAL;  in pldm_instance_id_free()
227 	/* Trying to free an instance ID that is not currently allocated */  in pldm_instance_id_free()
228 	if (!(ctx->state[tid].allocations & BIT(iid))) {  in pldm_instance_id_free()
229 		return -EINVAL;  in pldm_instance_id_free()
234 	rc = fcntl(ctx->lock_db_fd, F_OFD_SETLK, &flop);  in pldm_instance_id_free()
237 			return -EAGAIN;  in pldm_instance_id_free()
239 		return -EPROTO;  in pldm_instance_id_free()
242 	/* Mark the instance ID as no-longer allocated */  in pldm_instance_id_free()
243 	ctx->state[tid].allocations &= ~BIT(iid);  in pldm_instance_id_free()