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authorEric Van Hensbergen <ericvh@gmail.com>2005-09-09 16:04:24 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 16:57:57 -0400
commit3ed8491c8a75cefe95b57f7f428a3e2ddd421e97 (patch)
tree51729254e5b96f0a6794a7e11b51c5d67d9df874
parent322b329ab787de5f45abca9c9eabfd33bc5927e8 (diff)
[PATCH] v9fs: debug and support routines
This part of the patch contains debug and other misc routines. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat
-rw-r--r--fs/9p/debug.h70
-rw-r--r--fs/9p/error.c93
-rw-r--r--fs/9p/error.h181
-rw-r--r--fs/9p/fid.c241
-rw-r--r--fs/9p/fid.h57
5 files changed, 642 insertions, 0 deletions
diff --git a/fs/9p/debug.h b/fs/9p/debug.h
new file mode 100644
index 000000000000..4445f06919d9
--- /dev/null
+++ b/fs/9p/debug.h
@@ -0,0 +1,70 @@
1/*
2 * linux/fs/9p/debug.h - V9FS Debug Definitions
3 *
4 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
5 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to:
19 * Free Software Foundation
20 * 51 Franklin Street, Fifth Floor
21 * Boston, MA 02111-1301 USA
22 *
23 */
24
25#define DEBUG_ERROR (1<<0)
26#define DEBUG_CURRENT (1<<1)
27#define DEBUG_9P (1<<2)
28#define DEBUG_VFS (1<<3)
29#define DEBUG_CONV (1<<4)
30#define DEBUG_MUX (1<<5)
31#define DEBUG_TRANS (1<<6)
32#define DEBUG_SLABS (1<<7)
33
34#define DEBUG_DUMP_PKT 0
35
36extern int v9fs_debug_level;
37
38#define dprintk(level, format, arg...) \
39do { \
40 if((v9fs_debug_level & level)==level) \
41 printk(KERN_NOTICE "-- %s (%d): " \
42 format , __FUNCTION__, current->pid , ## arg); \
43} while(0)
44
45#define eprintk(level, format, arg...) \
46do { \
47 printk(level "v9fs: %s (%d): " \
48 format , __FUNCTION__, current->pid , ## arg); \
49} while(0)
50
51#if DEBUG_DUMP_PKT
52static inline void dump_data(const unsigned char *data, unsigned int datalen)
53{
54 int i, j;
55 int len = datalen;
56
57 printk(KERN_DEBUG "data ");
58 for (i = 0; i < len; i += 4) {
59 for (j = 0; (j < 4) && (i + j < len); j++)
60 printk(KERN_DEBUG "%02x", data[i + j]);
61 printk(KERN_DEBUG " ");
62 }
63 printk(KERN_DEBUG "\n");
64}
65#else /* DEBUG_DUMP_PKT */
66static inline void dump_data(const unsigned char *data, unsigned int datalen)
67{
68
69}
70#endif /* DEBUG_DUMP_PKT */
diff --git a/fs/9p/error.c b/fs/9p/error.c
new file mode 100644
index 000000000000..fee5d19179c5
--- /dev/null
+++ b/fs/9p/error.c
@@ -0,0 +1,93 @@
1/*
2 * linux/fs/9p/error.c
3 *
4 * Error string handling
5 *
6 * Plan 9 uses error strings, Unix uses error numbers. These functions
7 * try to help manage that and provide for dynamically adding error
8 * mappings.
9 *
10 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
11 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to:
25 * Free Software Foundation
26 * 51 Franklin Street, Fifth Floor
27 * Boston, MA 02111-1301 USA
28 *
29 */
30
31#include <linux/config.h>
32#include <linux/module.h>
33
34#include <linux/list.h>
35#include <linux/jhash.h>
36
37#include "debug.h"
38#include "error.h"
39
40/**
41 * v9fs_error_init - preload
42 * @errstr: error string
43 *
44 */
45
46int v9fs_error_init(void)
47{
48 struct errormap *c;
49 int bucket;
50
51 /* initialize hash table */
52 for (bucket = 0; bucket < ERRHASHSZ; bucket++)
53 INIT_HLIST_HEAD(&hash_errmap[bucket]);
54
55 /* load initial error map into hash table */
56 for (c = errmap; c->name != NULL; c++) {
57 bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
58 INIT_HLIST_NODE(&c->list);
59 hlist_add_head(&c->list, &hash_errmap[bucket]);
60 }
61
62 return 1;
63}
64
65/**
66 * errstr2errno - convert error string to error number
67 * @errstr: error string
68 *
69 */
70
71int v9fs_errstr2errno(char *errstr)
72{
73 int errno = 0;
74 struct hlist_node *p = NULL;
75 struct errormap *c = NULL;
76 int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
77
78 hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
79 if (!strcmp(c->name, errstr)) {
80 errno = c->val;
81 break;
82 }
83 }
84
85 if (errno == 0) {
86 /* TODO: if error isn't found, add it dynamically */
87 printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
88 errstr);
89 errno = 1;
90 }
91
92 return -errno;
93}
diff --git a/fs/9p/error.h b/fs/9p/error.h
new file mode 100644
index 000000000000..4bf2cf5aa1bb
--- /dev/null
+++ b/fs/9p/error.h
@@ -0,0 +1,181 @@
1/*
2 * linux/fs/9p/error.h
3 *
4 * Huge Nasty Error Table
5 *
6 * Plan 9 uses error strings, Unix uses error numbers. This table tries to
7 * match UNIX strings and Plan 9 strings to unix error numbers. It is used
8 * to preload the dynamic error table which can also track user-specific error
9 * strings.
10 *
11 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
12 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to:
26 * Free Software Foundation
27 * 51 Franklin Street, Fifth Floor
28 * Boston, MA 02111-1301 USA
29 *
30 */
31
32#include <linux/errno.h>
33
34struct errormap {
35 char *name;
36 int val;
37
38 struct hlist_node list;
39};
40
41#define ERRHASHSZ 32
42static struct hlist_head hash_errmap[ERRHASHSZ];
43
44/* FixMe - reduce to a reasonable size */
45static struct errormap errmap[] = {
46 {"Operation not permitted", 1},
47 {"wstat prohibited", 1},
48 {"No such file or directory", 2},
49 {"file not found", 2},
50 {"Interrupted system call", 4},
51 {"Input/output error", 5},
52 {"No such device or address", 6},
53 {"Argument list too long", 7},
54 {"Bad file descriptor", 9},
55 {"Resource temporarily unavailable", 11},
56 {"Cannot allocate memory", 12},
57 {"Permission denied", 13},
58 {"Bad address", 14},
59 {"Block device required", 15},
60 {"Device or resource busy", 16},
61 {"File exists", 17},
62 {"Invalid cross-device link", 18},
63 {"No such device", 19},
64 {"Not a directory", 20},
65 {"Is a directory", 21},
66 {"Invalid argument", 22},
67 {"Too many open files in system", 23},
68 {"Too many open files", 24},
69 {"Text file busy", 26},
70 {"File too large", 27},
71 {"No space left on device", 28},
72 {"Illegal seek", 29},
73 {"Read-only file system", 30},
74 {"Too many links", 31},
75 {"Broken pipe", 32},
76 {"Numerical argument out of domain", 33},
77 {"Numerical result out of range", 34},
78 {"Resource deadlock avoided", 35},
79 {"File name too long", 36},
80 {"No locks available", 37},
81 {"Function not implemented", 38},
82 {"Directory not empty", 39},
83 {"Too many levels of symbolic links", 40},
84 {"Unknown error 41", 41},
85 {"No message of desired type", 42},
86 {"Identifier removed", 43},
87 {"File locking deadlock error", 58},
88 {"No data available", 61},
89 {"Machine is not on the network", 64},
90 {"Package not installed", 65},
91 {"Object is remote", 66},
92 {"Link has been severed", 67},
93 {"Communication error on send", 70},
94 {"Protocol error", 71},
95 {"Bad message", 74},
96 {"File descriptor in bad state", 77},
97 {"Streams pipe error", 86},
98 {"Too many users", 87},
99 {"Socket operation on non-socket", 88},
100 {"Message too long", 90},
101 {"Protocol not available", 92},
102 {"Protocol not supported", 93},
103 {"Socket type not supported", 94},
104 {"Operation not supported", 95},
105 {"Protocol family not supported", 96},
106 {"Network is down", 100},
107 {"Network is unreachable", 101},
108 {"Network dropped connection on reset", 102},
109 {"Software caused connection abort", 103},
110 {"Connection reset by peer", 104},
111 {"No buffer space available", 105},
112 {"Transport endpoint is already connected", 106},
113 {"Transport endpoint is not connected", 107},
114 {"Cannot send after transport endpoint shutdown", 108},
115 {"Connection timed out", 110},
116 {"Connection refused", 111},
117 {"Host is down", 112},
118 {"No route to host", 113},
119 {"Operation already in progress", 114},
120 {"Operation now in progress", 115},
121 {"Is a named type file", 120},
122 {"Remote I/O error", 121},
123 {"Disk quota exceeded", 122},
124 {"Operation canceled", 125},
125 {"Unknown error 126", 126},
126 {"Unknown error 127", 127},
127/* errors from fossil, vacfs, and u9fs */
128 {"fid unknown or out of range", EBADF},
129 {"permission denied", EACCES},
130 {"file does not exist", ENOENT},
131 {"authentication failed", ECONNREFUSED},
132 {"bad offset in directory read", ESPIPE},
133 {"bad use of fid", EBADF},
134 {"wstat can't convert between files and directories", EPERM},
135 {"directory is not empty", ENOTEMPTY},
136 {"file exists", EEXIST},
137 {"file already exists", EEXIST},
138 {"file or directory already exists", EEXIST},
139 {"fid already in use", EBADF},
140 {"file in use", ETXTBSY},
141 {"i/o error", EIO},
142 {"file already open for I/O", ETXTBSY},
143 {"illegal mode", EINVAL},
144 {"illegal name", ENAMETOOLONG},
145 {"not a directory", ENOTDIR},
146 {"not a member of proposed group", EINVAL},
147 {"not owner", EACCES},
148 {"only owner can change group in wstat", EACCES},
149 {"read only file system", EROFS},
150 {"no access to special file", EPERM},
151 {"i/o count too large", EIO},
152 {"unknown group", EINVAL},
153 {"unknown user", EINVAL},
154 {"bogus wstat buffer", EPROTO},
155 {"exclusive use file already open", EAGAIN},
156 {"corrupted directory entry", EIO},
157 {"corrupted file entry", EIO},
158 {"corrupted block label", EIO},
159 {"corrupted meta data", EIO},
160 {"illegal offset", EINVAL},
161 {"illegal path element", ENOENT},
162 {"root of file system is corrupted", EIO},
163 {"corrupted super block", EIO},
164 {"protocol botch", EPROTO},
165 {"file system is full", ENOSPC},
166 {"file is in use", EAGAIN},
167 {"directory entry is not allocated", ENOENT},
168 {"file is read only", EROFS},
169 {"file has been removed", EIDRM},
170 {"only support truncation to zero length", EPERM},
171 {"cannot remove root", EPERM},
172 {"file too big", EFBIG},
173 {"venti i/o error", EIO},
174 /* these are not errors */
175 {"u9fs rhostsauth: no authentication required", 0},
176 {"u9fs authnone: no authentication required", 0},
177 {NULL, -1}
178};
179
180extern int v9fs_error_init(void);
181extern int v9fs_errstr2errno(char *errstr);
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
new file mode 100644
index 000000000000..821c9c4d76aa
--- /dev/null
+++ b/fs/9p/fid.c
@@ -0,0 +1,241 @@
1/*
2 * V9FS FID Management
3 *
4 * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to:
18 * Free Software Foundation
19 * 51 Franklin Street, Fifth Floor
20 * Boston, MA 02111-1301 USA
21 *
22 */
23
24#include <linux/config.h>
25#include <linux/module.h>
26#include <linux/errno.h>
27#include <linux/fs.h>
28#include <linux/idr.h>
29
30#include "debug.h"
31#include "v9fs.h"
32#include "9p.h"
33#include "v9fs_vfs.h"
34#include "transport.h"
35#include "mux.h"
36#include "conv.h"
37#include "fid.h"
38
39/**
40 * v9fs_fid_insert - add a fid to a dentry
41 * @fid: fid to add
42 * @dentry: dentry that it is being added to
43 *
44 */
45
46static int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
47{
48 struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
49 dprintk(DEBUG_9P, "fid %d (%p) dentry %s (%p)\n", fid->fid, fid,
50 dentry->d_iname, dentry);
51 if (dentry->d_fsdata == NULL) {
52 dentry->d_fsdata =
53 kmalloc(sizeof(struct list_head), GFP_KERNEL);
54 if (dentry->d_fsdata == NULL) {
55 dprintk(DEBUG_ERROR, "Out of memory\n");
56 return -ENOMEM;
57 }
58 fid_list = (struct list_head *)dentry->d_fsdata;
59 INIT_LIST_HEAD(fid_list); /* Initialize list head */
60 }
61
62 fid->uid = current->uid;
63 fid->pid = current->pid;
64 list_add(&fid->list, fid_list);
65 return 0;
66}
67
68/**
69 * v9fs_fid_create - allocate a FID structure
70 * @dentry - dentry to link newly created fid to
71 *
72 */
73
74struct v9fs_fid *v9fs_fid_create(struct dentry *dentry)
75{
76 struct v9fs_fid *new;
77
78 new = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
79 if (new == NULL) {
80 dprintk(DEBUG_ERROR, "Out of Memory\n");
81 return ERR_PTR(-ENOMEM);
82 }
83
84 new->fid = -1;
85 new->fidopen = 0;
86 new->fidcreate = 0;
87 new->fidclunked = 0;
88 new->iounit = 0;
89
90 if (v9fs_fid_insert(new, dentry) == 0)
91 return new;
92 else {
93 dprintk(DEBUG_ERROR, "Problems inserting to dentry\n");
94 kfree(new);
95 return NULL;
96 }
97}
98
99/**
100 * v9fs_fid_destroy - deallocate a FID structure
101 * @fid: fid to destroy
102 *
103 */
104
105void v9fs_fid_destroy(struct v9fs_fid *fid)
106{
107 list_del(&fid->list);
108 kfree(fid);
109}
110
111/**
112 * v9fs_fid_lookup - retrieve the right fid from a particular dentry
113 * @dentry: dentry to look for fid in
114 * @type: intent of lookup (operation or traversal)
115 *
116 * search list of fids associated with a dentry for a fid with a matching
117 * thread id or uid. If that fails, look up the dentry's parents to see if you
118 * can find a matching fid.
119 *
120 */
121
122struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry, int type)
123{
124 struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
125 struct v9fs_fid *current_fid = NULL;
126 struct v9fs_fid *temp = NULL;
127 struct v9fs_fid *return_fid = NULL;
128 int found_parent = 0;
129 int found_user = 0;
130
131 dprintk(DEBUG_9P, " dentry: %s (%p) type %d\n", dentry->d_iname, dentry,
132 type);
133
134 if (fid_list && !list_empty(fid_list)) {
135 list_for_each_entry_safe(current_fid, temp, fid_list, list) {
136 if (current_fid->uid == current->uid) {
137 if (return_fid == NULL) {
138 if ((type == FID_OP)
139 || (!current_fid->fidopen)) {
140 return_fid = current_fid;
141 found_user = 1;
142 }
143 }
144 }
145 if (current_fid->pid == current->real_parent->pid) {
146 if ((return_fid == NULL) || (found_parent)
147 || (found_user)) {
148 if ((type == FID_OP)
149 || (!current_fid->fidopen)) {
150 return_fid = current_fid;
151 found_parent = 1;
152 found_user = 0;
153 }
154 }
155 }
156 if (current_fid->pid == current->pid) {
157 if ((type == FID_OP) ||
158 (!current_fid->fidopen)) {
159 return_fid = current_fid;
160 found_parent = 0;
161 found_user = 0;
162 }
163 }
164 }
165 }
166
167 /* we are at the root but didn't match */
168 if ((!return_fid) && (dentry->d_parent == dentry)) {
169 /* TODO: clone attach with new uid */
170 return_fid = current_fid;
171 }
172
173 if (!return_fid) {
174 struct dentry *par = current->fs->pwd->d_parent;
175 int count = 1;
176 while (par != NULL) {
177 if (par == dentry)
178 break;
179 count++;
180 if (par == par->d_parent) {
181 dprintk(DEBUG_ERROR,
182 "got to root without finding dentry\n");
183 break;
184 }
185 par = par->d_parent;
186 }
187
188/* XXX - there may be some duplication we can get rid of */
189 if (par == dentry) {
190 /* we need to fid_lookup the starting point */
191 int fidnum = -1;
192 int oldfid = -1;
193 int result = -1;
194 struct v9fs_session_info *v9ses =
195 v9fs_inode2v9ses(current->fs->pwd->d_inode);
196
197 current_fid =
198 v9fs_fid_lookup(current->fs->pwd, FID_WALK);
199 if (current_fid == NULL) {
200 dprintk(DEBUG_ERROR,
201 "process cwd doesn't have a fid\n");
202 return return_fid;
203 }
204 oldfid = current_fid->fid;
205 par = current->fs->pwd;
206 /* TODO: take advantage of multiwalk */
207
208 fidnum = v9fs_get_idpool(&v9ses->fidpool);
209 if (fidnum < 0) {
210 dprintk(DEBUG_ERROR,
211 "could not get a new fid num\n");
212 return return_fid;
213 }
214
215 while (par != dentry) {
216 result =
217 v9fs_t_walk(v9ses, oldfid, fidnum, "..",
218 NULL);
219 if (result < 0) {
220 dprintk(DEBUG_ERROR,
221 "problem walking to parent\n");
222
223 break;
224 }
225 oldfid = fidnum;
226 if (par == par->d_parent) {
227 dprintk(DEBUG_ERROR,
228 "can't find dentry\n");
229 break;
230 }
231 par = par->d_parent;
232 }
233 if (par == dentry) {
234 return_fid = v9fs_fid_create(dentry);
235 return_fid->fid = fidnum;
236 }
237 }
238 }
239
240 return return_fid;
241}
diff --git a/fs/9p/fid.h b/fs/9p/fid.h
new file mode 100644
index 000000000000..7db478ccca36
--- /dev/null
+++ b/fs/9p/fid.h
@@ -0,0 +1,57 @@
1/*
2 * V9FS FID Management
3 *
4 * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to:
18 * Free Software Foundation
19 * 51 Franklin Street, Fifth Floor
20 * Boston, MA 02111-1301 USA
21 *
22 */
23
24#include <linux/list.h>
25
26#define FID_OP 0
27#define FID_WALK 1
28
29struct v9fs_fid {
30 struct list_head list; /* list of fids associated with a dentry */
31 struct list_head active; /* XXX - debug */
32
33 u32 fid;
34 unsigned char fidopen; /* set when fid is opened */
35 unsigned char fidcreate; /* set when fid was just created */
36 unsigned char fidclunked; /* set when fid has already been clunked */
37
38 struct v9fs_qid qid;
39 u32 iounit;
40
41 /* readdir stuff */
42 int rdir_fpos;
43 loff_t rdir_pos;
44 struct v9fs_fcall *rdir_fcall;
45
46 /* management stuff */
47 pid_t pid; /* thread associated with this fid */
48 uid_t uid; /* user associated with this fid */
49
50 /* private data */
51 struct file *filp; /* backpointer to File struct for open files */
52 struct v9fs_session_info *v9ses; /* session info for this FID */
53};
54
55struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry, int type);
56void v9fs_fid_destroy(struct v9fs_fid *fid);
57struct v9fs_fid *v9fs_fid_create(struct dentry *);
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