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[PATCH] v9fs: debug and support routines

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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>
This commit is contained in:
Eric Van Hensbergen 2005-09-09 13:04:24 -07:00 committed by Linus Torvalds
parent 322b329ab7
commit 3ed8491c8a
5 changed files with 642 additions and 0 deletions
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70
fs/9p/debug.h Normal file
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/*
* linux/fs/9p/debug.h - V9FS Debug Definitions
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#define DEBUG_ERROR (1<<0)
#define DEBUG_CURRENT (1<<1)
#define DEBUG_9P (1<<2)
#define DEBUG_VFS (1<<3)
#define DEBUG_CONV (1<<4)
#define DEBUG_MUX (1<<5)
#define DEBUG_TRANS (1<<6)
#define DEBUG_SLABS (1<<7)
#define DEBUG_DUMP_PKT 0
extern int v9fs_debug_level;
#define dprintk(level, format, arg...) \
do { \
if((v9fs_debug_level & level)==level) \
printk(KERN_NOTICE "-- %s (%d): " \
format , __FUNCTION__, current->pid , ## arg); \
} while(0)
#define eprintk(level, format, arg...) \
do { \
printk(level "v9fs: %s (%d): " \
format , __FUNCTION__, current->pid , ## arg); \
} while(0)
#if DEBUG_DUMP_PKT
static inline void dump_data(const unsigned char *data, unsigned int datalen)
{
int i, j;
int len = datalen;
printk(KERN_DEBUG "data ");
for (i = 0; i < len; i += 4) {
for (j = 0; (j < 4) && (i + j < len); j++)
printk(KERN_DEBUG "%02x", data[i + j]);
printk(KERN_DEBUG " ");
}
printk(KERN_DEBUG "\n");
}
#else /* DEBUG_DUMP_PKT */
static inline void dump_data(const unsigned char *data, unsigned int datalen)
{
}
#endif /* DEBUG_DUMP_PKT */

93
fs/9p/error.c Normal file
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/*
* linux/fs/9p/error.c
*
* Error string handling
*
* Plan 9 uses error strings, Unix uses error numbers. These functions
* try to help manage that and provide for dynamically adding error
* mappings.
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/jhash.h>
#include "debug.h"
#include "error.h"
/**
* v9fs_error_init - preload
* @errstr: error string
*
*/
int v9fs_error_init(void)
{
struct errormap *c;
int bucket;
/* initialize hash table */
for (bucket = 0; bucket < ERRHASHSZ; bucket++)
INIT_HLIST_HEAD(&hash_errmap[bucket]);
/* load initial error map into hash table */
for (c = errmap; c->name != NULL; c++) {
bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
INIT_HLIST_NODE(&c->list);
hlist_add_head(&c->list, &hash_errmap[bucket]);
}
return 1;
}
/**
* errstr2errno - convert error string to error number
* @errstr: error string
*
*/
int v9fs_errstr2errno(char *errstr)
{
int errno = 0;
struct hlist_node *p = NULL;
struct errormap *c = NULL;
int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
if (!strcmp(c->name, errstr)) {
errno = c->val;
break;
}
}
if (errno == 0) {
/* TODO: if error isn't found, add it dynamically */
printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
errstr);
errno = 1;
}
return -errno;
}

181
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/*
* linux/fs/9p/error.h
*
* Huge Nasty Error Table
*
* Plan 9 uses error strings, Unix uses error numbers. This table tries to
* match UNIX strings and Plan 9 strings to unix error numbers. It is used
* to preload the dynamic error table which can also track user-specific error
* strings.
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#include <linux/errno.h>
struct errormap {
char *name;
int val;
struct hlist_node list;
};
#define ERRHASHSZ 32
static struct hlist_head hash_errmap[ERRHASHSZ];
/* FixMe - reduce to a reasonable size */
static struct errormap errmap[] = {
{"Operation not permitted", 1},
{"wstat prohibited", 1},
{"No such file or directory", 2},
{"file not found", 2},
{"Interrupted system call", 4},
{"Input/output error", 5},
{"No such device or address", 6},
{"Argument list too long", 7},
{"Bad file descriptor", 9},
{"Resource temporarily unavailable", 11},
{"Cannot allocate memory", 12},
{"Permission denied", 13},
{"Bad address", 14},
{"Block device required", 15},
{"Device or resource busy", 16},
{"File exists", 17},
{"Invalid cross-device link", 18},
{"No such device", 19},
{"Not a directory", 20},
{"Is a directory", 21},
{"Invalid argument", 22},
{"Too many open files in system", 23},
{"Too many open files", 24},
{"Text file busy", 26},
{"File too large", 27},
{"No space left on device", 28},
{"Illegal seek", 29},
{"Read-only file system", 30},
{"Too many links", 31},
{"Broken pipe", 32},
{"Numerical argument out of domain", 33},
{"Numerical result out of range", 34},
{"Resource deadlock avoided", 35},
{"File name too long", 36},
{"No locks available", 37},
{"Function not implemented", 38},
{"Directory not empty", 39},
{"Too many levels of symbolic links", 40},
{"Unknown error 41", 41},
{"No message of desired type", 42},
{"Identifier removed", 43},
{"File locking deadlock error", 58},
{"No data available", 61},
{"Machine is not on the network", 64},
{"Package not installed", 65},
{"Object is remote", 66},
{"Link has been severed", 67},
{"Communication error on send", 70},
{"Protocol error", 71},
{"Bad message", 74},
{"File descriptor in bad state", 77},
{"Streams pipe error", 86},
{"Too many users", 87},
{"Socket operation on non-socket", 88},
{"Message too long", 90},
{"Protocol not available", 92},
{"Protocol not supported", 93},
{"Socket type not supported", 94},
{"Operation not supported", 95},
{"Protocol family not supported", 96},
{"Network is down", 100},
{"Network is unreachable", 101},
{"Network dropped connection on reset", 102},
{"Software caused connection abort", 103},
{"Connection reset by peer", 104},
{"No buffer space available", 105},
{"Transport endpoint is already connected", 106},
{"Transport endpoint is not connected", 107},
{"Cannot send after transport endpoint shutdown", 108},
{"Connection timed out", 110},
{"Connection refused", 111},
{"Host is down", 112},
{"No route to host", 113},
{"Operation already in progress", 114},
{"Operation now in progress", 115},
{"Is a named type file", 120},
{"Remote I/O error", 121},
{"Disk quota exceeded", 122},
{"Operation canceled", 125},
{"Unknown error 126", 126},
{"Unknown error 127", 127},
/* errors from fossil, vacfs, and u9fs */
{"fid unknown or out of range", EBADF},
{"permission denied", EACCES},
{"file does not exist", ENOENT},
{"authentication failed", ECONNREFUSED},
{"bad offset in directory read", ESPIPE},
{"bad use of fid", EBADF},
{"wstat can't convert between files and directories", EPERM},
{"directory is not empty", ENOTEMPTY},
{"file exists", EEXIST},
{"file already exists", EEXIST},
{"file or directory already exists", EEXIST},
{"fid already in use", EBADF},
{"file in use", ETXTBSY},
{"i/o error", EIO},
{"file already open for I/O", ETXTBSY},
{"illegal mode", EINVAL},
{"illegal name", ENAMETOOLONG},
{"not a directory", ENOTDIR},
{"not a member of proposed group", EINVAL},
{"not owner", EACCES},
{"only owner can change group in wstat", EACCES},
{"read only file system", EROFS},
{"no access to special file", EPERM},
{"i/o count too large", EIO},
{"unknown group", EINVAL},
{"unknown user", EINVAL},
{"bogus wstat buffer", EPROTO},
{"exclusive use file already open", EAGAIN},
{"corrupted directory entry", EIO},
{"corrupted file entry", EIO},
{"corrupted block label", EIO},
{"corrupted meta data", EIO},
{"illegal offset", EINVAL},
{"illegal path element", ENOENT},
{"root of file system is corrupted", EIO},
{"corrupted super block", EIO},
{"protocol botch", EPROTO},
{"file system is full", ENOSPC},
{"file is in use", EAGAIN},
{"directory entry is not allocated", ENOENT},
{"file is read only", EROFS},
{"file has been removed", EIDRM},
{"only support truncation to zero length", EPERM},
{"cannot remove root", EPERM},
{"file too big", EFBIG},
{"venti i/o error", EIO},
/* these are not errors */
{"u9fs rhostsauth: no authentication required", 0},
{"u9fs authnone: no authentication required", 0},
{NULL, -1}
};
extern int v9fs_error_init(void);
extern int v9fs_errstr2errno(char *errstr);

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/*
* V9FS FID Management
*
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/idr.h>
#include "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "v9fs_vfs.h"
#include "transport.h"
#include "mux.h"
#include "conv.h"
#include "fid.h"
/**
* v9fs_fid_insert - add a fid to a dentry
* @fid: fid to add
* @dentry: dentry that it is being added to
*
*/
static int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
{
struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
dprintk(DEBUG_9P, "fid %d (%p) dentry %s (%p)\n", fid->fid, fid,
dentry->d_iname, dentry);
if (dentry->d_fsdata == NULL) {
dentry->d_fsdata =
kmalloc(sizeof(struct list_head), GFP_KERNEL);
if (dentry->d_fsdata == NULL) {
dprintk(DEBUG_ERROR, "Out of memory\n");
return -ENOMEM;
}
fid_list = (struct list_head *)dentry->d_fsdata;
INIT_LIST_HEAD(fid_list); /* Initialize list head */
}
fid->uid = current->uid;
fid->pid = current->pid;
list_add(&fid->list, fid_list);
return 0;
}
/**
* v9fs_fid_create - allocate a FID structure
* @dentry - dentry to link newly created fid to
*
*/
struct v9fs_fid *v9fs_fid_create(struct dentry *dentry)
{
struct v9fs_fid *new;
new = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
if (new == NULL) {
dprintk(DEBUG_ERROR, "Out of Memory\n");
return ERR_PTR(-ENOMEM);
}
new->fid = -1;
new->fidopen = 0;
new->fidcreate = 0;
new->fidclunked = 0;
new->iounit = 0;
if (v9fs_fid_insert(new, dentry) == 0)
return new;
else {
dprintk(DEBUG_ERROR, "Problems inserting to dentry\n");
kfree(new);
return NULL;
}
}
/**
* v9fs_fid_destroy - deallocate a FID structure
* @fid: fid to destroy
*
*/
void v9fs_fid_destroy(struct v9fs_fid *fid)
{
list_del(&fid->list);
kfree(fid);
}
/**
* v9fs_fid_lookup - retrieve the right fid from a particular dentry
* @dentry: dentry to look for fid in
* @type: intent of lookup (operation or traversal)
*
* search list of fids associated with a dentry for a fid with a matching
* thread id or uid. If that fails, look up the dentry's parents to see if you
* can find a matching fid.
*
*/
struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry, int type)
{
struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
struct v9fs_fid *current_fid = NULL;
struct v9fs_fid *temp = NULL;
struct v9fs_fid *return_fid = NULL;
int found_parent = 0;
int found_user = 0;
dprintk(DEBUG_9P, " dentry: %s (%p) type %d\n", dentry->d_iname, dentry,
type);
if (fid_list && !list_empty(fid_list)) {
list_for_each_entry_safe(current_fid, temp, fid_list, list) {
if (current_fid->uid == current->uid) {
if (return_fid == NULL) {
if ((type == FID_OP)
|| (!current_fid->fidopen)) {
return_fid = current_fid;
found_user = 1;
}
}
}
if (current_fid->pid == current->real_parent->pid) {
if ((return_fid == NULL) || (found_parent)
|| (found_user)) {
if ((type == FID_OP)
|| (!current_fid->fidopen)) {
return_fid = current_fid;
found_parent = 1;
found_user = 0;
}
}
}
if (current_fid->pid == current->pid) {
if ((type == FID_OP) ||
(!current_fid->fidopen)) {
return_fid = current_fid;
found_parent = 0;
found_user = 0;
}
}
}
}
/* we are at the root but didn't match */
if ((!return_fid) && (dentry->d_parent == dentry)) {
/* TODO: clone attach with new uid */
return_fid = current_fid;
}
if (!return_fid) {
struct dentry *par = current->fs->pwd->d_parent;
int count = 1;
while (par != NULL) {
if (par == dentry)
break;
count++;
if (par == par->d_parent) {
dprintk(DEBUG_ERROR,
"got to root without finding dentry\n");
break;
}
par = par->d_parent;
}
/* XXX - there may be some duplication we can get rid of */
if (par == dentry) {
/* we need to fid_lookup the starting point */
int fidnum = -1;
int oldfid = -1;
int result = -1;
struct v9fs_session_info *v9ses =
v9fs_inode2v9ses(current->fs->pwd->d_inode);
current_fid =
v9fs_fid_lookup(current->fs->pwd, FID_WALK);
if (current_fid == NULL) {
dprintk(DEBUG_ERROR,
"process cwd doesn't have a fid\n");
return return_fid;
}
oldfid = current_fid->fid;
par = current->fs->pwd;
/* TODO: take advantage of multiwalk */
fidnum = v9fs_get_idpool(&v9ses->fidpool);
if (fidnum < 0) {
dprintk(DEBUG_ERROR,
"could not get a new fid num\n");
return return_fid;
}
while (par != dentry) {
result =
v9fs_t_walk(v9ses, oldfid, fidnum, "..",
NULL);
if (result < 0) {
dprintk(DEBUG_ERROR,
"problem walking to parent\n");
break;
}
oldfid = fidnum;
if (par == par->d_parent) {
dprintk(DEBUG_ERROR,
"can't find dentry\n");
break;
}
par = par->d_parent;
}
if (par == dentry) {
return_fid = v9fs_fid_create(dentry);
return_fid->fid = fidnum;
}
}
}
return return_fid;
}

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/*
* V9FS FID Management
*
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#include <linux/list.h>
#define FID_OP 0
#define FID_WALK 1
struct v9fs_fid {
struct list_head list; /* list of fids associated with a dentry */
struct list_head active; /* XXX - debug */
u32 fid;
unsigned char fidopen; /* set when fid is opened */
unsigned char fidcreate; /* set when fid was just created */
unsigned char fidclunked; /* set when fid has already been clunked */
struct v9fs_qid qid;
u32 iounit;
/* readdir stuff */
int rdir_fpos;
loff_t rdir_pos;
struct v9fs_fcall *rdir_fcall;
/* management stuff */
pid_t pid; /* thread associated with this fid */
uid_t uid; /* user associated with this fid */
/* private data */
struct file *filp; /* backpointer to File struct for open files */
struct v9fs_session_info *v9ses; /* session info for this FID */
};
struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry, int type);
void v9fs_fid_destroy(struct v9fs_fid *fid);
struct v9fs_fid *v9fs_fid_create(struct dentry *);