1efb301462
Volume close should not close underlying device until all I/O targeting this volume are deallocated. To achieve this a reference counter is added to volume. Counter value matches number of I/O objects associated with volume. Counter is freezed when volume is closed, blocking allocation of new I/O objects. Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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* Copyright(c) 2012-2018 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause-Clear
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*/
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#include "ocf/ocf.h"
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#include "ocf_io_priv.h"
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#include "ocf_volume_priv.h"
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/*
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* This is io allocator dedicated for bottom devices.
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* Out IO structure looks like this:
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* --------------> +-------------------------+
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* | OCF is aware | |
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* | of this part. | struct ocf_io_meta |
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* | | |
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* | +-------------------------+ <----------------
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* | | | Bottom adapter |
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* | | struct ocf_io | is aware of |
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* | | | this part. |
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* --------------> +-------------------------+ |
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* | | |
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* | Bottom adapter specific | |
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* | context data structure. | |
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* | | |
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* +-------------------------+ <----------------
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*/
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#define OCF_IO_TOTAL_SIZE(priv_size) (sizeof(struct ocf_io_meta) + \
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sizeof(struct ocf_io) + priv_size)
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env_allocator *ocf_io_allocator_create(uint32_t size, const char *name)
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{
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return env_allocator_create(OCF_IO_TOTAL_SIZE(size), name);
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}
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void ocf_io_allocator_destroy(env_allocator *allocator)
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{
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env_allocator_destroy(allocator);
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}
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/*
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* IO internal API
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*/
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void *ocf_io_get_meta(struct ocf_io* io)
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{
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return (void *)io - sizeof(struct ocf_io_meta);
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}
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struct ocf_io *ocf_io_new(ocf_volume_t volume)
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{
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struct ocf_io *io;
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struct ocf_io_meta *io_meta;
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void *data;
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if (!ocf_refcnt_inc(&volume->refcnt))
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return NULL;
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data = env_allocator_new(volume->type->allocator);
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if (!data) {
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ocf_refcnt_dec(&volume->refcnt);
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return NULL;
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}
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io = data + sizeof(struct ocf_io_meta);
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io_meta = ocf_io_get_meta(io);
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io->volume = volume;
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io->ops = &volume->type->properties->io_ops;
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env_atomic_set(&io_meta->ref_count, 1);
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return io;
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}
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/*
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* IO external API
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*/
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void *ocf_io_get_priv(struct ocf_io* io)
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{
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return (void *)io + sizeof(struct ocf_io);
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}
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void ocf_io_get(struct ocf_io *io)
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{
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struct ocf_io_meta *io_meta = ocf_io_get_meta(io);
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env_atomic_inc_return(&io_meta->ref_count);
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}
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void ocf_io_put(struct ocf_io *io)
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{
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struct ocf_io_meta *io_meta = ocf_io_get_meta(io);
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if (env_atomic_dec_return(&io_meta->ref_count))
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return;
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ocf_refcnt_dec(&io->volume->refcnt);
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env_allocator_del(io->volume->type->allocator,
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(void *)io - sizeof(struct ocf_io_meta));
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}
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