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fid.h
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lib9p.h
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Editing: fid.h
/* * Copyright 2016 Jakub Klama <jceel@FreeBSD.org> * All rights reserved * * Redistribution and use in source and binary forms, with or without * modification, are permitted providing that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * */ #ifndef LIB9P_FID_H #define LIB9P_FID_H #include <stdbool.h> /* * Data structure for a fid. All active fids in one session * are stored in a hash table; the hash table provides the * iterator to process them. (See also l9p_connection in lib9p.h.) * * The back-end code has additional data per fid, found via * lo_aux. Currently this is allocated with a separate calloc(). * * Most fids represent a file or directory, but a few are special * purpose, including the auth fid from Tauth+Tattach, and the * fids used for extended attributes. We have our own set of * flags here in lo_flags. * * Note that all new fids start as potentially-valid (reserving * their 32-bit fid value), but not actually-valid. If another * (threaded) op is invoked on a not-yet-valid fid, the fid cannot * be used. A fid can also be locked against other threads, in * which case they must wait for it: this happens during create * and open, which on success result in the fid changing from a * directory to a file. (At least, all this applies in principle * -- we're currently single-threaded per connection so the locks * are nop-ed out and the valid bit is mainly just for debug.) * * Fids that are "open" (the underlying file or directory is open) * are marked as well. * * Locking is managed by the front end (request.c); validation * and type-marking can be done by either side as needed. * * Fid types and validity are manipulated by set* and unset* * functions, and tested by is* ops. Note that we only * distinguish between "directory" and "not directory" at this * level, i.e., symlinks and devices are just "not a directory * fid". Also, fids cannot be unset as auth or xattr fids, * nor can an open fid become closed, except by being clunked. * While files should not normally become directories, it IS normal * for directory fids to become file fids due to Twalk operations. * * (These accessor functions are just to leave wiggle room for * different future implementations.) */ struct l9p_fid { void *lo_aux; uint32_t lo_fid; uint32_t lo_flags; /* volatile atomic_t when threaded? */ }; enum l9p_lo_flags { L9P_LO_ISAUTH = 0x01, L9P_LO_ISDIR = 0x02, L9P_LO_ISOPEN = 0x04, L9P_LO_ISVALID = 0x08, L9P_LO_ISXATTR = 0x10, }; static inline bool l9p_fid_isauth(struct l9p_fid *fid) { return ((fid->lo_flags & L9P_LO_ISAUTH) != 0); } static inline void l9p_fid_setauth(struct l9p_fid *fid) { fid->lo_flags |= L9P_LO_ISAUTH; } static inline bool l9p_fid_isdir(struct l9p_fid *fid) { return ((fid->lo_flags & L9P_LO_ISDIR) != 0); } static inline void l9p_fid_setdir(struct l9p_fid *fid) { fid->lo_flags |= L9P_LO_ISDIR; } static inline void l9p_fid_unsetdir(struct l9p_fid *fid) { fid->lo_flags &= ~(uint32_t)L9P_LO_ISDIR; } static inline bool l9p_fid_isopen(struct l9p_fid *fid) { return ((fid->lo_flags & L9P_LO_ISOPEN) != 0); } static inline void l9p_fid_setopen(struct l9p_fid *fid) { fid->lo_flags |= L9P_LO_ISOPEN; } static inline bool l9p_fid_isvalid(struct l9p_fid *fid) { return ((fid->lo_flags & L9P_LO_ISVALID) != 0); } static inline void l9p_fid_setvalid(struct l9p_fid *fid) { fid->lo_flags |= L9P_LO_ISVALID; } static inline void l9p_fid_unsetvalid(struct l9p_fid *fid) { fid->lo_flags &= ~(uint32_t)L9P_LO_ISVALID; } static inline bool l9p_fid_isxattr(struct l9p_fid *fid) { return ((fid->lo_flags & L9P_LO_ISXATTR) != 0); } static inline void l9p_fid_setxattr(struct l9p_fid *fid) { fid->lo_flags |= L9P_LO_ISXATTR; } #endif /* LIB9P_FID_H */
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