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#ifndef DBFS_TRANS_H
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#define DBFS_TRANS_H
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/*
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* Support for single-fuse_req transactions.
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*/
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#include "dbfs.h"
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// forward-declaration
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struct dbfs_trans;
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// generic callback
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typedef void (*dbfs_trans_cb) (struct dbfs_trans *ctx);
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/*
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* Request/transaction state.
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*/
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struct dbfs_trans {
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struct fuse_req *req;
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struct evsql_trans *trans;
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// called when the dbfs_trans is being free'd
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dbfs_trans_cb free_fn;
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// called once the transaction is ready
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dbfs_trans_cb begin_fn;
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// called once the transaction has been commited
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dbfs_trans_cb commit_fn;
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// set by trans_error to EIO if !NULL
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int *err_ptr;
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};
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/*
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* Call from commit_fn once you've set req to NULL. Also called from trans_fail.
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*
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* Will call free_fn if present.
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*/
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void dbfs_trans_free (struct dbfs_trans *ctx);
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/*
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* Fail the dbfs_trans, aborting any trans, erroring out any req and freeing the ctx.
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*/
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void dbfs_trans_fail (struct dbfs_trans *ctx, int err);
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/*
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* Initialize the ctx with the given req (stays the same during the lifetime), and opens the transaction.
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*
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* You should set the callback functions after/before calling this.
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*
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* begin_fn will be called once the transaction is open, if that fails, the req will be errored for you.
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*
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* If opening the transaction fails, this will return nonzero and not touch req, otherwise zero.
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*/
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int dbfs_trans_init (struct dbfs_trans *ctx, struct fuse_req *req);
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/*
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* Same as init, but allocates/frees-on-error the dbfs_trans for you.
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*/
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struct dbfs_trans *dbfs_trans_new (struct fuse_req *req);
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/*
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* Commit the dbfs_trans. After calling this, the ctx may or may not be valid, and commit_fn may or may not be called.
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*/
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void dbfs_trans_commit (struct dbfs_trans *ctx);
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#endif /* DBFS_TRANS_H */
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