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Date:: Sun Aug 28 10:07:02 2022 UTC
Message:: ftp: issue slightly smaller requests to please u9fs u9fs like to return "i/o count too large" on reads/writes that exceeds msize - 24. seems arbiratry, as in theory we should be able to issue a Tread/Twrite for msize - (HEADERSIZE + 4) = msize - 13. Don't know where the other eleven bits come from. To conclude the rant: even if a client issues a Tread/write too large, why don't just return a value smaller than requested? It's explicitly documented in the plan9 manpage for Tread.
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  1 fb1a36c0 2022-01-09 op /*
  2 fb1a36c0 2022-01-09 op  * Copyright (c) 2021, 2022 Omar Polo <op@omarpolo.com>
  3 fb1a36c0 2022-01-09 op  *
  4 fb1a36c0 2022-01-09 op  * Permission to use, copy, modify, and distribute this software for any
  5 fb1a36c0 2022-01-09 op  * purpose with or without fee is hereby granted, provided that the above
  6 fb1a36c0 2022-01-09 op  * copyright notice and this permission notice appear in all copies.
  7 fb1a36c0 2022-01-09 op  *
  8 fb1a36c0 2022-01-09 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 fb1a36c0 2022-01-09 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 fb1a36c0 2022-01-09 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 fb1a36c0 2022-01-09 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 fb1a36c0 2022-01-09 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 fb1a36c0 2022-01-09 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 fb1a36c0 2022-01-09 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 fb1a36c0 2022-01-09 op  */
 16 fb1a36c0 2022-01-09 op 
 17 fb1a36c0 2022-01-09 op #ifndef KAMI_H
 18 fb1a36c0 2022-01-09 op #define KAMI_H
 19 fb1a36c0 2022-01-09 op 
 20 fb1a36c0 2022-01-09 op /*
 21 fb1a36c0 2022-01-09 op  * 9p message header.
 22 fb1a36c0 2022-01-09 op  *
 23 fb1a36c0 2022-01-09 op  * The message itself is len bytes long (counting the whole header
 24 fb1a36c0 2022-01-09 op  * too.)
 25 fb1a36c0 2022-01-09 op  */
 26 fb1a36c0 2022-01-09 op struct np_msg_header {
 27 fb1a36c0 2022-01-09 op 	uint32_t	len;
 28 fb1a36c0 2022-01-09 op 	uint8_t		type;
 29 fb1a36c0 2022-01-09 op 	uint16_t	tag;
 30 fb1a36c0 2022-01-09 op };
 31 fb1a36c0 2022-01-09 op 
 32 344d2bad 2022-01-22 op /*
 33 344d2bad 2022-01-22 op  * The qid represents the server unique identification for the file.
 34 344d2bad 2022-01-22 op  * NOTE: the struct fields don't reflect the layout on the wire!
 35 344d2bad 2022-01-22 op  */
 36 fb1a36c0 2022-01-09 op struct qid {
 37 fb1a36c0 2022-01-09 op 	uint64_t		 path;
 38 fb1a36c0 2022-01-09 op 	uint32_t		 vers;
 39 fb1a36c0 2022-01-09 op 	uint8_t			 type;
 40 fb1a36c0 2022-01-09 op };
 41 fb1a36c0 2022-01-09 op 
 42 4cce062e 2022-01-16 op struct np_stat {
 43 9029ac6f 2022-01-19 op 	uint16_t	 size;
 44 4cce062e 2022-01-16 op 	uint16_t	 type;
 45 4cce062e 2022-01-16 op 	uint32_t	 dev;
 46 4cce062e 2022-01-16 op 	struct qid	 qid;
 47 4cce062e 2022-01-16 op 	uint32_t	 mode;
 48 4cce062e 2022-01-16 op 	uint32_t	 atime;
 49 4cce062e 2022-01-16 op 	uint32_t	 mtime;
 50 4cce062e 2022-01-16 op 	uint64_t	 length;
 51 4cce062e 2022-01-16 op 	char		*name;
 52 4cce062e 2022-01-16 op 	char		*uid;
 53 4cce062e 2022-01-16 op 	char		*gid;
 54 4cce062e 2022-01-16 op 	char		*muid;
 55 4cce062e 2022-01-16 op };
 56 4cce062e 2022-01-16 op 
 57 fb1a36c0 2022-01-09 op /* useful constants */
 58 fb1a36c0 2022-01-09 op #define HEADERSIZE	(4 + 1 + 2)
 59 fb1a36c0 2022-01-09 op #define	VERSION9P	"9P2000"
 60 fb1a36c0 2022-01-09 op #define MSIZE9P		((uint32_t)4*1024*1024)
 61 fb1a36c0 2022-01-09 op #define NOTAG		((uint16_t)~0U)
 62 fb1a36c0 2022-01-09 op #define NOFID		((uint32_t)~0U)
 63 fb1a36c0 2022-01-09 op #define NOUID		(-1)
 64 fb1a36c0 2022-01-09 op #define QIDSIZE		13
 65 fb1a36c0 2022-01-09 op #define MAXWELEM	16
 66 fb1a36c0 2022-01-09 op 
 67 7bafb2fd 2022-08-28 op /*
 68 7bafb2fd 2022-08-28 op  * from u9fs "ample room for Twrite/Rread header".  It's a bit sloppy
 69 7bafb2fd 2022-08-28 op  * but otherwise it fails with "i/o count too large".  Only for usage in
 70 7bafb2fd 2022-08-28 op  * clients.
 71 7bafb2fd 2022-08-28 op  */
 72 7bafb2fd 2022-08-28 op #define IOHDRSZ		24
 73 7bafb2fd 2022-08-28 op 
 74 fb1a36c0 2022-01-09 op #define NPSTATSIZ(namlen, uidnam, gidnam, unam) \
 75 fb1a36c0 2022-01-09 op 	(6 + QIDSIZE + 20 + 2 + namlen + 2 + uidnam + 2 + gidnam + 2 + unam)
 76 fb1a36c0 2022-01-09 op 
 77 fb1a36c0 2022-01-09 op /* bits in Qid.type */
 78 fb1a36c0 2022-01-09 op #define QTDIR		0x80		/* type bit for directories */
 79 fb1a36c0 2022-01-09 op #define QTAPPEND	0x40		/* type bit for append only files */
 80 fb1a36c0 2022-01-09 op #define QTEXCL		0x20		/* type bit for exclusive use files */
 81 fb1a36c0 2022-01-09 op #define QTMOUNT		0x10		/* type bit for mounted channel */
 82 fb1a36c0 2022-01-09 op #define QTAUTH		0x08		/* type bit for authentication file */
 83 fb1a36c0 2022-01-09 op #define QTTMP		0x04		/* type bit for non-backed-up file */
 84 fb1a36c0 2022-01-09 op #define QTSYMLINK	0x02		/* type bit for symbolic link */
 85 fb1a36c0 2022-01-09 op #define QTFILE		0x00		/* type bits for plain file */
 86 fb1a36c0 2022-01-09 op 
 87 fb1a36c0 2022-01-09 op /* Topen mode/flags */
 88 fb1a36c0 2022-01-09 op #define KOREAD		0x00
 89 fb1a36c0 2022-01-09 op #define KOWRITE		0x01
 90 fb1a36c0 2022-01-09 op #define KORDWR		0x02
 91 fb1a36c0 2022-01-09 op #define KOEXEC		0x03
 92 fb1a36c0 2022-01-09 op #define KOTRUNC		0x10
 93 fb1a36c0 2022-01-09 op #define KORCLOSE	0x40
 94 fb1a36c0 2022-01-09 op 
 95 fb1a36c0 2022-01-09 op /* 9p message types */
 96 fb1a36c0 2022-01-09 op enum {
 97 fb1a36c0 2022-01-09 op 	Treaddir =	40,	/* .L */
 98 fb1a36c0 2022-01-09 op 	Rreaddir,
 99 fb1a36c0 2022-01-09 op 
100 aa495dd9 2022-01-22 op 	Tversion =	100, /* 0x64 */
101 fb1a36c0 2022-01-09 op 	Rversion,
102 aa495dd9 2022-01-22 op 	Tauth =		102, /* 0x66 */
103 fb1a36c0 2022-01-09 op 	Rauth,
104 aa495dd9 2022-01-22 op 	Tattach =	104, /* 0x68  */
105 fb1a36c0 2022-01-09 op 	Rattach,
106 fb1a36c0 2022-01-09 op 	Terror =	106,	/* illegal */
107 fb1a36c0 2022-01-09 op 	Rerror,
108 aa495dd9 2022-01-22 op 	Tflush =	108, /* 0x6c */
109 fb1a36c0 2022-01-09 op 	Rflush,
110 aa495dd9 2022-01-22 op 	Twalk =		110, /* 0x6e */
111 fb1a36c0 2022-01-09 op 	Rwalk,
112 aa495dd9 2022-01-22 op 	Topen =		112, /* 0x70 */
113 fb1a36c0 2022-01-09 op 	Ropen,
114 aa495dd9 2022-01-22 op 	Tcreate =	114, /* 0x72 */
115 fb1a36c0 2022-01-09 op 	Rcreate,
116 aa495dd9 2022-01-22 op 	Tread =		116, /* 0x74 */
117 fb1a36c0 2022-01-09 op 	Rread,
118 aa495dd9 2022-01-22 op 	Twrite =	118, /* 0x76 */
119 fb1a36c0 2022-01-09 op 	Rwrite,
120 aa495dd9 2022-01-22 op 	Tclunk =	120, /* 0x78 */
121 fb1a36c0 2022-01-09 op 	Rclunk,
122 aa495dd9 2022-01-22 op 	Tremove =	122, /* 0x7a */
123 fb1a36c0 2022-01-09 op 	Rremove,
124 aa495dd9 2022-01-22 op 	Tstat =		124, /* 0x7c */
125 fb1a36c0 2022-01-09 op 	Rstat,
126 aa495dd9 2022-01-22 op 	Twstat =	126, /* 0x7e */
127 fb1a36c0 2022-01-09 op 	Rwstat,
128 fb1a36c0 2022-01-09 op 	Tmax,
129 fb1a36c0 2022-01-09 op 
130 fb1a36c0 2022-01-09 op 	/*
131 fb1a36c0 2022-01-09 op 	 * plan9ports' include/fcall.h also has a
132 fb1a36c0 2022-01-09 op 	 *
133 fb1a36c0 2022-01-09 op 	 *	Topenfd = 98,
134 fb1a36c0 2022-01-09 op 	 *	Ropenfd,
135 fb1a36c0 2022-01-09 op 	 *
136 fb1a36c0 2022-01-09 op 	 * which it's not mentioned in the 9p "rfc" over at
137 fb1a36c0 2022-01-09 op 	 * 9p.cat-v.org.  Ignoring that for now.
138 fb1a36c0 2022-01-09 op 	 */
139 fb1a36c0 2022-01-09 op };
140 fb1a36c0 2022-01-09 op 
141 fb1a36c0 2022-01-09 op #endif