e9d400d5b9
In the next step, this won't be a channel at all. Change-Id: Ia8fe4da5b0b283e8dfc5c6477b84cfdd346d89a0 Signed-off-by: Ben Walker <benjamin.walker@intel.com> Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/449464 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
414 lines
13 KiB
C
414 lines
13 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* SPDK Filesystem
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*/
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#ifndef SPDK_FS_H
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#define SPDK_FS_H
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#include "spdk/stdinc.h"
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#include "spdk/blob.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SPDK_FILE_NAME_MAX 255
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struct spdk_file;
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struct spdk_filesystem;
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typedef struct spdk_file *spdk_fs_iter;
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struct spdk_blobfs_opts {
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uint32_t cluster_sz;
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};
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struct spdk_file_stat {
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spdk_blob_id blobid;
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uint64_t size;
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};
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/**
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* Filesystem operation completion callback with handle.
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*
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* \param ctx Context for the operation.
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* \param fs Handle to a blobfs.
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* \param fserrno 0 if it completed successfully, or negative errno if it failed.
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*/
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typedef void (*spdk_fs_op_with_handle_complete)(void *ctx, struct spdk_filesystem *fs,
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int fserrno);
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/**
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* File operation completion callback with handle.
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*
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* \param ctx Context for the operation.
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* \param f Handle to a file.
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* \param fserrno 0 if it completed successfully, or negative errno if it failed.
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*/
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typedef void (*spdk_file_op_with_handle_complete)(void *ctx, struct spdk_file *f, int fserrno);
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typedef spdk_bs_op_complete spdk_fs_op_complete;
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/**
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* File operation completion callback.
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*
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* \param ctx Context for the operation.
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* \param fserrno 0 if it completed successfully, or negative errno if it failed.
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*/
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typedef void (*spdk_file_op_complete)(void *ctx, int fserrno);
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/**
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* File stat operation completion callback.
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*
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* \param ctx Context for the operation.
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* \param stat Handle to the stat about the file.
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* \param fserrno 0 if it completed successfully, or negative errno if it failed.
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*/
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typedef void (*spdk_file_stat_op_complete)(void *ctx, struct spdk_file_stat *stat, int fserrno);
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/**
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* Function for a request of file system.
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*
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* \param arg Argument to the request function.
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*/
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typedef void (*fs_request_fn)(void *arg);
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/**
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* Function for sending request.
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*
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* This function will be invoked any time when the filesystem wants to pass a
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* message to the main dispatch thread.
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*
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* \param fs_request_fn A pointer to the request function.
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* \param arg Argument to the request function.
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*/
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typedef void (*fs_send_request_fn)(fs_request_fn, void *arg);
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/**
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* Initialize a spdk_blobfs_opts structure to the default option values.
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*
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* \param opts spdk_blobf_opts struture to intialize.
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*/
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void spdk_fs_opts_init(struct spdk_blobfs_opts *opts);
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/**
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* Initialize blobstore filesystem.
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*
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* Initialize the blobstore filesystem on the blobstore block device which has
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* been created by the function spdk_bdev_create_bs_dev() in the blob_bdev.h.
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* The obtained blobstore filesystem will be passed to the callback function.
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*
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* \param dev Blobstore block device used by this blobstore filesystem.
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* \param opt Initialization options used for this blobstore filesystem.
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* \param send_request_fn The function for sending request. This function will
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* be invoked any time when the blobstore filesystem wants to pass a message to
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* the main dispatch thread.
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* \param cb_fn Called when the initialization is complete.
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* \param cb_arg Argument passed to function cb_fn.
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*/
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void spdk_fs_init(struct spdk_bs_dev *dev, struct spdk_blobfs_opts *opt,
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fs_send_request_fn send_request_fn,
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spdk_fs_op_with_handle_complete cb_fn, void *cb_arg);
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/**
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* Load blobstore filesystem from the given blobstore block device.
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*
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* The obtained blobstore filesystem will be passed to the callback function.
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*
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* \param dev Blobstore block device used by this blobstore filesystem.
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* \param send_request_fn The function for sending request. This function will
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* be invoked any time when the blobstore filesystem wants to pass a message to
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* the main dispatch thread.
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* \param cb_fn Called when the loading is complete.
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* \param cb_arg Argument passed to function cb_fn.
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*/
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void spdk_fs_load(struct spdk_bs_dev *dev, fs_send_request_fn send_request_fn,
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spdk_fs_op_with_handle_complete cb_fn, void *cb_arg);
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/**
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* Unload blobstore filesystem.
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*
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* \param fs Blobstore filesystem to unload.
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* \param cb_fn Called when the unloading is complete.
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* \param cb_arg Argument passed to function cb_fn.
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*/
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void spdk_fs_unload(struct spdk_filesystem *fs, spdk_fs_op_complete cb_fn, void *cb_arg);
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/**
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* Allocate an I/O channel for asynchronous operations.
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*
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* \param fs Blobstore filesystem to allocate I/O channel.
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*
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* \return a pointer to the I/O channel on success or NULL otherwise.
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*/
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struct spdk_io_channel *spdk_fs_alloc_io_channel(struct spdk_filesystem *fs);
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/**
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* Free I/O channel.
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*
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* This function will decrease the references of this I/O channel. If the reference
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* is reduced to 0, the I/O channel will be freed.
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*
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* \param channel I/O channel to free.
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*/
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void spdk_fs_free_io_channel(struct spdk_io_channel *channel);
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/**
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* Allocate a context for synchronous operations.
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*
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* \param fs Blobstore filesystem for this context.
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*
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* \return a pointer to the context on success or NULL otherwise.
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*/
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struct spdk_fs_thread_ctx *spdk_fs_alloc_thread_ctx(struct spdk_filesystem *fs);
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/**
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* Free thread context.
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*
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* \param ctx Thread context to free.
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*/
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void spdk_fs_free_thread_ctx(struct spdk_fs_thread_ctx *ctx);
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/**
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* Get statistics about the file including the underlying blob id and the file size.
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*
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* \param fs Blobstore filesystem.
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* \param ctx The thread context for this operation
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* \param name The file name used to look up the matched file in the blobstore filesystem.
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* \param stat Caller allocated structure to store the obtained information about
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* this file.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_fs_file_stat(struct spdk_filesystem *fs, struct spdk_fs_thread_ctx *ctx,
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const char *name, struct spdk_file_stat *stat);
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#define SPDK_BLOBFS_OPEN_CREATE (1ULL << 0)
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/**
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* Create a new file on the given blobstore filesystem.
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*
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* \param fs Blobstore filesystem.
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* \param ctx The thread context for this operation
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* \param name The file name for this new file.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_fs_create_file(struct spdk_filesystem *fs, struct spdk_fs_thread_ctx *ctx,
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const char *name);
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/**
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* Open the file.
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*
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* \param fs Blobstore filesystem.
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* \param ctx The thread context for this operation
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* \param name The file name used to look up the matched file in the blobstore filesystem.
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* \param flags This flags will be used to control the open mode.
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* \param file It will point to the open file if sccessful or NULL otherwirse.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_fs_open_file(struct spdk_filesystem *fs, struct spdk_fs_thread_ctx *ctx,
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const char *name, uint32_t flags, struct spdk_file **file);
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/**
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* Close the file.
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*
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* \param file File to close.
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* \param ctx The thread context for this operation
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_file_close(struct spdk_file *file, struct spdk_fs_thread_ctx *ctx);
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/**
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* Change the file name.
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*
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* This operation will overwrite an existing file if there is a file with the
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* same name.
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*
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* \param fs Blobstore filesystem.
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* \param ctx The thread context for this operation
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* \param old_name Old name of the file.
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* \param new_name New name of the file.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_fs_rename_file(struct spdk_filesystem *fs, struct spdk_fs_thread_ctx *ctx,
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const char *old_name, const char *new_name);
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/**
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* Delete the file.
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*
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* \param fs Blobstore filesystem.
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* \param ctx The thread context for this operation
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* \param name The name of the file to be deleted.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_fs_delete_file(struct spdk_filesystem *fs, struct spdk_fs_thread_ctx *ctx,
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const char *name);
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/**
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* Get the first file in the blobstore filesystem.
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*
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* \param fs Blobstore filesystem to traverse.
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*
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* \return an iterator which points to the first file in the blobstore filesystem.
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*/
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spdk_fs_iter spdk_fs_iter_first(struct spdk_filesystem *fs);
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/**
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* Get the next file in the blobstore filesystem by using the input iterator.
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*
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* \param iter The iterator which points to the current file struct.
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*
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* \return an iterator which points to the next file in the blobstore filesystem.
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*/
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spdk_fs_iter spdk_fs_iter_next(spdk_fs_iter iter);
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#define spdk_fs_iter_get_file(iter) ((struct spdk_file *)(iter))
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/**
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* Truncate the file.
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*
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* \param file File to truncate.
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* \param ctx The thread context for this operation
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* \param length New size in bytes of the file.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_file_truncate(struct spdk_file *file, struct spdk_fs_thread_ctx *ctx,
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uint64_t length);
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/**
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* Get file name.
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*
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* \param file File to query.
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*
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* \return the name of the file.
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*/
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const char *spdk_file_get_name(struct spdk_file *file);
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/**
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* Obtain the size of the file.
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*
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* \param file File to query.
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*
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* \return the size in bytes of the file.
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*/
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uint64_t spdk_file_get_length(struct spdk_file *file);
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/**
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* Write data to the given file.
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*
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* \param file File to write.
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* \param ctx The thread context for this operation
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* \param payload The specified buffer which should contain the data to be transmitted.
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* \param offset The beginning position to write data.
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* \param length The size in bytes of data to write.
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*
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* \return 0 on success, negative errno on failure.
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*/
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int spdk_file_write(struct spdk_file *file, struct spdk_fs_thread_ctx *ctx,
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void *payload, uint64_t offset, uint64_t length);
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/**
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* Read data to user buffer from the given file.
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*
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* \param file File to read.
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* \param ctx The thread context for this operation
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* \param payload The specified buffer which will store the obtained data.
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* \param offset The beginning position to read.
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* \param length The size in bytes of data to read.
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*
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* \return the end position of this read operation on success, negated errno on failure.
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*/
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int64_t spdk_file_read(struct spdk_file *file, struct spdk_fs_thread_ctx *ctx,
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void *payload, uint64_t offset, uint64_t length);
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/**
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* Set cache size for the blobstore filesystem.
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*
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* \param size_in_mb Cache size in megabytes.
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*/
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void spdk_fs_set_cache_size(uint64_t size_in_mb);
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/**
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* Obtain the cache size.
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*
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* \return cache size in megabytes.
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*/
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uint64_t spdk_fs_get_cache_size(void);
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#define SPDK_FILE_PRIORITY_LOW 0 /* default */
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#define SPDK_FILE_PRIORITY_HIGH 1
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/**
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* Set priority for the file.
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*
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* \param file File to set priority.
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* \param priority Priority level (SPDK_FILE_PRIORITY_LOW or SPDK_FILE_PRIORITY_HIGH).
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*/
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void spdk_file_set_priority(struct spdk_file *file, uint32_t priority);
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/**
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* Synchronize the data from the cache to the disk.
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*
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* \param file File to sync.
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* \param ctx The thread context for this operation
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*
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* \return 0 on success.
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*/
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int spdk_file_sync(struct spdk_file *file, struct spdk_fs_thread_ctx *ctx);
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/**
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* Get the unique ID for the file.
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*
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* \param file File to get the ID.
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* \param id ID buffer.
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* \param size Size of the ID buffer.
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*
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* \return the length of ID on success.
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*/
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int spdk_file_get_id(struct spdk_file *file, void *id, size_t size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SPDK_FS_H_ */
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