www.pudn.com > yaffs2.zip > yaffsfs.c
/*
* YAFFS: Yet another FFS. A NAND-flash specific file system.
* yaffsfs.c The interface functions for using YAFFS via a "direct" interface.
*
* Copyright (C) 2002 Aleph One Ltd.
*
* Created by Charles Manning
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include "yaffsfs.h"
#include "yaffs_guts.h"
#include "yaffscfg.h"
#include // for memset
#include "yportenv.h"
#define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
#ifndef NULL
#define NULL ((void *)0)
#endif
const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.1 2004/11/03 08:29:28 charles Exp $";
// configurationList is the list of devices that are supported
static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
//
// Directory search context
//
// NB this is an opaque structure.
struct yaffsfs_ObjectListEntry
{
int objectId;
struct yaffsfs_ObjectListEntry *next;
};
typedef struct
{
__u32 magic;
yaffs_dirent de;
struct yaffsfs_ObjectListEntry *list;
char name[NAME_MAX+1];
} yaffsfs_DirectorySearchContext;
// Handle management.
//
typedef struct
{
__u8 inUse:1; // this handle is in use
__u8 readOnly:1; // this handle is read only
__u8 append:1; // append only
__u8 exclusive:1; // exclusive
__u32 position; // current position in file
yaffs_Object *obj; // the object
}yaffsfs_Handle;
static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth);
static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
// yaffsfs_InitHandle
/// Inilitalise handles on start-up.
//
static int yaffsfs_InitHandles(void)
{
int i;
for(i = 0; i < YAFFSFS_N_HANDLES; i++)
{
yaffsfs_handle[i].inUse = 0;
yaffsfs_handle[i].obj = NULL;
}
return 0;
}
yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
{
if(h < 0 || h >= YAFFSFS_N_HANDLES)
{
return NULL;
}
return &yaffsfs_handle[h];
}
yaffs_Object *yaffsfs_GetHandleObject(int handle)
{
yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
if(h && h->inUse)
{
return h->obj;
}
return NULL;
}
//yaffsfs_GetHandle
// Grab a handle (when opening a file)
//
static int yaffsfs_GetHandle(void)
{
int i;
yaffsfs_Handle *h;
for(i = 0; i < YAFFSFS_N_HANDLES; i++)
{
h = yaffsfs_GetHandlePointer(i);
if(!h)
{
// todo bug: should never happen
}
if(!h->inUse)
{
memset(h,0,sizeof(yaffsfs_Handle));
h->inUse=1;
return i;
}
}
return -1;
}
// yaffs_PutHandle
// Let go of a handle (when closing a file)
//
static int yaffsfs_PutHandle(int handle)
{
yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
if(h)
{
h->inUse = 0;
h->obj = NULL;
}
return 0;
}
// Stuff to search for a directory from a path
int yaffsfs_Match(char a, char b)
{
// case sensitive
return (a == b);
}
// yaffsfs_FindDevice
// yaffsfs_FindRoot
// Scan the configuration list to find the root.
static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath)
{
yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
const char *leftOver;
const char *p;
while(cfg && cfg->prefix && cfg->dev)
{
leftOver = path;
p = cfg->prefix;
while(*p && *leftOver && yaffsfs_Match(*p,*leftOver))
{
p++;
leftOver++;
}
if(!*p)
{
// Matched prefix
*restOfPath = (char *)leftOver;
return cfg->dev;
}
cfg++;
}
return NULL;
}
static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath)
{
yaffs_Device *dev;
dev= yaffsfs_FindDevice(path,restOfPath);
if(dev && dev->isMounted)
{
return dev->rootDir;
}
return NULL;
}
static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
{
while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
{
char *alias = obj->variant.symLinkVariant.alias;
if(*alias == '/')
{
// Starts with a /, need to scan from root up
obj = yaffsfs_FindObject(NULL,alias,symDepth++);
}
else
{
// Relative to here, so use the parent of the symlink as a start
obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
}
}
return obj;
}
// yaffsfs_FindDirectory
// Parse a path to determine the directory and the name within the directory.
//
// eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth)
{
yaffs_Object *dir;
char *restOfPath;
char str[YAFFS_MAX_NAME_LENGTH+1];
int i;
if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
{
return NULL;
}
if(startDir)
{
dir = startDir;
restOfPath = (char *)path;
}
else
{
dir = yaffsfs_FindRoot(path,&restOfPath);
}
while(dir)
{
// parse off /.
// curve ball: also throw away surplus '/'
// eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
while(*restOfPath == '/')
{
restOfPath++; // get rid of '/'
}
*name = restOfPath;
i = 0;
while(*restOfPath && *restOfPath != '/')
{
if (i < YAFFS_MAX_NAME_LENGTH)
{
str[i] = *restOfPath;
str[i+1] = '\0';
i++;
}
restOfPath++;
}
if(!*restOfPath)
{
// got to the end of the string
return dir;
}
else
{
if(strcmp(str,".") == 0)
{
// Do nothing
}
else if(strcmp(str,"..") == 0)
{
dir = dir->parent;
}
else
{
dir = yaffs_FindObjectByName(dir,str);
while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
{
dir = yaffsfs_FollowLink(dir,symDepth);
}
if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
{
dir = NULL;
}
}
}
}
// directory did not exist.
return NULL;
}
static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth)
{
return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
}
// yaffsfs_FindObject turns a path for an existing object into the object
//
static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth)
{
yaffs_Object *dir;
char *name;
dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
if(dir && *name)
{
return yaffs_FindObjectByName(dir,name);
}
return dir;
}
int yaffs_open(const char *path, int oflag, int mode)
{
yaffs_Object *obj = NULL;
yaffs_Object *dir = NULL;
char *name;
int handle = -1;
yaffsfs_Handle *h = NULL;
int alreadyOpen = 0;
int alreadyExclusive = 0;
int openDenied = 0;
int symDepth = 0;
int errorReported = 0;
int i;
// todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
yaffsfs_Lock();
handle = yaffsfs_GetHandle();
if(handle >= 0)
{
h = yaffsfs_GetHandlePointer(handle);
// try to find the exisiting object
obj = yaffsfs_FindObject(NULL,path,0);
if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
{
obj = yaffsfs_FollowLink(obj,symDepth++);
}
if(obj)
{
// Check if the object is already in use
alreadyOpen = alreadyExclusive = 0;
for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
{
if(i != handle &&
yaffsfs_handle[i].inUse &&
obj == yaffsfs_handle[i].obj)
{
alreadyOpen = 1;
if(yaffsfs_handle[i].exclusive)
{
alreadyExclusive = 1;
}
}
}
if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
{
openDenied = 1;
}
// Open should fail if O_CREAT and O_EXCL are specified
if((oflag & O_EXCL) && (oflag & O_CREAT))
{
openDenied = 1;
yaffsfs_SetError(-EEXIST);
errorReported = 1;
}
// Check file permissions
if( (oflag & (O_RDWR | O_WRONLY)) == 0 && // ie O_RDONLY
!(obj->st_mode & S_IREAD))
{
openDenied = 1;
}
if( (oflag & O_RDWR) &&
!(obj->st_mode & S_IREAD))
{
openDenied = 1;
}
if( (oflag & (O_RDWR | O_WRONLY)) &&
!(obj->st_mode & S_IWRITE))
{
openDenied = 1;
}
}
else if((oflag & O_CREAT))
{
// Let's see if we can create this file
dir = yaffsfs_FindDirectory(NULL,path,&name,0);
if(dir)
{
obj = yaffs_MknodFile(dir,name,mode,0,0);
}
else
{
yaffsfs_SetError(-ENOTDIR);
}
}
if(obj && !openDenied)
{
h->obj = obj;
h->inUse = 1;
h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
h->append = (oflag & O_APPEND) ? 1 : 0;
h->exclusive = (oflag & O_EXCL) ? 1 : 0;
h->position = 0;
obj->inUse++;
if((oflag & O_TRUNC) && !h->readOnly)
{
//todo truncate
yaffs_ResizeFile(obj,0);
}
}
else
{
yaffsfs_PutHandle(handle);
if(!errorReported)
{
yaffsfs_SetError(-EACCESS);
errorReported = 1;
}
handle = -1;
}
}
yaffsfs_Unlock();
return handle;
}
int yaffs_close(int fd)
{
yaffsfs_Handle *h = NULL;
int retVal = 0;
yaffsfs_Lock();
h = yaffsfs_GetHandlePointer(fd);
if(h && h->inUse)
{
// clean up
yaffs_FlushFile(h->obj,1);
h->obj->inUse--;
if(h->obj->inUse <= 0 && h->obj->unlinked)
{
yaffs_DeleteFile(h->obj);
}
yaffsfs_PutHandle(fd);
retVal = 0;
}
else
{
// bad handle
yaffsfs_SetError(-EBADF);
retVal = -1;
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_read(int fd, void *buf, unsigned int nbyte)
{
yaffsfs_Handle *h = NULL;
yaffs_Object *obj = NULL;
int pos = 0;
int nRead = -1;
int maxRead;
yaffsfs_Lock();
h = yaffsfs_GetHandlePointer(fd);
obj = yaffsfs_GetHandleObject(fd);
if(!h || !obj)
{
// bad handle
yaffsfs_SetError(-EBADF);
}
else if( h && obj)
{
pos= h->position;
if(yaffs_GetObjectFileLength(obj) > pos)
{
maxRead = yaffs_GetObjectFileLength(obj) - pos;
}
else
{
maxRead = 0;
}
if(nbyte > maxRead)
{
nbyte = maxRead;
}
if(nbyte > 0)
{
nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
if(nRead >= 0)
{
h->position = pos + nRead;
}
else
{
//todo error
}
}
else
{
nRead = 0;
}
}
yaffsfs_Unlock();
return (nRead >= 0) ? nRead : -1;
}
int yaffs_write(int fd, const void *buf, unsigned int nbyte)
{
yaffsfs_Handle *h = NULL;
yaffs_Object *obj = NULL;
int pos = 0;
int nWritten = -1;
yaffsfs_Lock();
h = yaffsfs_GetHandlePointer(fd);
obj = yaffsfs_GetHandleObject(fd);
if(!h || !obj)
{
// bad handle
yaffsfs_SetError(-EBADF);
}
else if( h && obj && h->readOnly)
{
// todo error
}
else if( h && obj)
{
if(h->append)
{
pos = yaffs_GetObjectFileLength(obj);
}
else
{
pos = h->position;
}
nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte);
if(nWritten >= 0)
{
h->position = pos + nWritten;
}
else
{
//todo error
}
}
yaffsfs_Unlock();
return (nWritten >= 0) ? nWritten : -1;
}
int yaffs_truncate(int fd, unsigned int newSize)
{
yaffsfs_Handle *h = NULL;
yaffs_Object *obj = NULL;
int result = 0;
yaffsfs_Lock();
h = yaffsfs_GetHandlePointer(fd);
obj = yaffsfs_GetHandleObject(fd);
if(!h || !obj)
{
// bad handle
yaffsfs_SetError(-EBADF);
}
else
{
// resize the file
result = yaffs_ResizeFile(obj,newSize);
}
yaffsfs_Unlock();
return (result) ? 0 : -1;
}
off_t yaffs_lseek(int fd, off_t offset, int whence)
{
yaffsfs_Handle *h = NULL;
yaffs_Object *obj = NULL;
int pos = -1;
int fSize = -1;
yaffsfs_Lock();
h = yaffsfs_GetHandlePointer(fd);
obj = yaffsfs_GetHandleObject(fd);
if(!h || !obj)
{
// bad handle
yaffsfs_SetError(-EBADF);
}
else if(whence == SEEK_SET)
{
if(offset >= 0)
{
pos = offset;
}
}
else if(whence == SEEK_CUR)
{
if( (h->position + offset) >= 0)
{
pos = (h->position + offset);
}
}
else if(whence == SEEK_END)
{
fSize = yaffs_GetObjectFileLength(obj);
if(fSize >= 0 && (fSize + offset) >= 0)
{
pos = fSize + offset;
}
}
if(pos >= 0)
{
h->position = pos;
}
else
{
// todo error
}
yaffsfs_Unlock();
return pos;
}
int yaffsfs_DoUnlink(const char *path,int isDirectory)
{
yaffs_Object *dir = NULL;
yaffs_Object *obj = NULL;
char *name;
int result = YAFFS_FAIL;
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL,path,0);
dir = yaffsfs_FindDirectory(NULL,path,&name,0);
if(!dir)
{
yaffsfs_SetError(-ENOTDIR);
}
else if(!obj)
{
yaffsfs_SetError(-ENOENT);
}
else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
{
yaffsfs_SetError(-EISDIR);
}
else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
{
yaffsfs_SetError(-ENOTDIR);
}
else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
{
yaffsfs_SetError(-ENOTDIR);
}
else
{
result = yaffs_Unlink(dir,name);
if(result == YAFFS_FAIL && isDirectory)
{
yaffsfs_SetError(-ENOTEMPTY);
}
}
yaffsfs_Unlock();
// todo error
return (result == YAFFS_FAIL) ? -1 : 0;
}
int yaffs_rmdir(const char *path)
{
return yaffsfs_DoUnlink(path,1);
}
int yaffs_unlink(const char *path)
{
return yaffsfs_DoUnlink(path,0);
}
int yaffs_rename(const char *oldPath, const char *newPath)
{
yaffs_Object *olddir = NULL;
yaffs_Object *newdir = NULL;
yaffs_Object *obj = NULL;
char *oldname;
char *newname;
int result= YAFFS_FAIL;
int renameAllowed = 1;
yaffsfs_Lock();
olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
obj = yaffsfs_FindObject(NULL,oldPath,0);
if(!olddir || !newdir || !obj)
{
// bad file
yaffsfs_SetError(-EBADF);
renameAllowed = 0;
}
else if(olddir->myDev != newdir->myDev)
{
// oops must be on same device
// todo error
yaffsfs_SetError(-EXDEV);
renameAllowed = 0;
}
else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
{
// It is a directory, check that it is not being renamed to
// being its own decendent.
// Do this by tracing from the new directory back to the root, checking for obj
yaffs_Object *xx = newdir;
while( renameAllowed && xx)
{
if(xx == obj)
{
renameAllowed = 0;
}
xx = xx->parent;
}
if(!renameAllowed) yaffsfs_SetError(-EACCESS);
}
if(renameAllowed)
{
result = yaffs_RenameObject(olddir,oldname,newdir,newname);
}
yaffsfs_Unlock();
return (result == YAFFS_FAIL) ? -1 : 0;
}
static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
{
int retVal = -1;
if(obj)
{
obj = yaffs_GetEquivalentObject(obj);
}
if(obj && buf)
{
buf->st_dev = (int)obj->myDev->genericDevice;
buf->st_ino = obj->objectId;
buf->st_mode = obj->st_mode & ~S_IFMT; // clear out file type bits
if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
{
buf->st_mode |= S_IFDIR;
}
else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
{
buf->st_mode |= S_IFLNK;
}
else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
{
buf->st_mode |= S_IFREG;
}
buf->st_nlink = yaffs_GetObjectLinkCount(obj);
buf->st_uid = 0;
buf->st_gid = 0;;
buf->st_rdev = obj->st_rdev;
buf->st_size = yaffs_GetObjectFileLength(obj);
buf->st_blksize = obj->myDev->nBytesPerChunk;
buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
buf->st_atime = obj->st_atime;
buf->st_ctime = obj->st_ctime;
buf->st_mtime = obj->st_mtime;
retVal = 0;
}
return retVal;
}
static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
{
yaffs_Object *obj;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL,path,0);
if(!doLStat && obj)
{
obj = yaffsfs_FollowLink(obj,0);
}
if(obj)
{
retVal = yaffsfs_DoStat(obj,buf);
}
else
{
// todo error not found
yaffsfs_SetError(-ENOENT);
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_stat(const char *path, struct yaffs_stat *buf)
{
return yaffsfs_DoStatOrLStat(path,buf,0);
}
int yaffs_lstat(const char *path, struct yaffs_stat *buf)
{
return yaffsfs_DoStatOrLStat(path,buf,1);
}
int yaffs_fstat(int fd, struct yaffs_stat *buf)
{
yaffs_Object *obj;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_GetHandleObject(fd);
if(obj)
{
retVal = yaffsfs_DoStat(obj,buf);
}
else
{
// bad handle
yaffsfs_SetError(-EBADF);
}
yaffsfs_Unlock();
return retVal;
}
static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
{
int result;
if(obj)
{
obj = yaffs_GetEquivalentObject(obj);
}
if(obj)
{
obj->st_mode = mode;
obj->dirty = 1;
result = yaffs_FlushFile(obj,0);
}
return result == YAFFS_OK ? 0 : -1;
}
int yaffs_chmod(const char *path, mode_t mode)
{
yaffs_Object *obj;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL,path,0);
if(obj)
{
retVal = yaffsfs_DoChMod(obj,mode);
}
else
{
// todo error not found
yaffsfs_SetError(-ENOENT);
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_fchmod(int fd, mode_t mode)
{
yaffs_Object *obj;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_GetHandleObject(fd);
if(obj)
{
retVal = yaffsfs_DoChMod(obj,mode);
}
else
{
// bad handle
yaffsfs_SetError(-EBADF);
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_mkdir(const char *path, mode_t mode)
{
yaffs_Object *parent = NULL;
yaffs_Object *dir;
char *name;
int retVal= -1;
yaffsfs_Lock();
parent = yaffsfs_FindDirectory(NULL,path,&name,0);
dir = yaffs_MknodDirectory(parent,name,mode,0,0);
if(dir)
{
retVal = 0;
}
else
{
yaffsfs_SetError(-ENOSPC); // just assume no space for now
retVal = -1;
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_mount(const char *path)
{
int retVal=-1;
int result=YAFFS_FAIL;
yaffs_Device *dev=NULL;
char *dummy;
T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path));
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path,&dummy);
if(dev)
{
if(!dev->isMounted)
{
result = yaffs_GutsInitialise(dev);
if(result == YAFFS_FAIL)
{
// todo error - mount failed
yaffsfs_SetError(-ENOMEM);
}
retVal = result ? 0 : -1;
}
else
{
//todo error - already mounted.
yaffsfs_SetError(-EBUSY);
}
}
else
{
// todo error - no device
yaffsfs_SetError(-ENODEV);
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_unmount(const char *path)
{
int retVal=-1;
yaffs_Device *dev=NULL;
char *dummy;
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path,&dummy);
if(dev)
{
if(dev->isMounted)
{
int i;
int inUse;
for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
{
if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
{
inUse = 1; // the device is in use, can't unmount
}
}
if(!inUse)
{
yaffs_Deinitialise(dev);
retVal = 0;
}
else
{
// todo error can't unmount as files are open
yaffsfs_SetError(-EBUSY);
}
}
else
{
//todo error - not mounted.
yaffsfs_SetError(-EINVAL);
}
}
else
{
// todo error - no device
yaffsfs_SetError(-ENODEV);
}
yaffsfs_Unlock();
return retVal;
}
off_t yaffs_freespace(const char *path)
{
off_t retVal=-1;
yaffs_Device *dev=NULL;
char *dummy;
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path,&dummy);
if(dev)
{
retVal = yaffs_GetNumberOfFreeChunks(dev);
retVal *= dev->nBytesPerChunk;
}
else
{
yaffsfs_SetError(-EINVAL);
}
yaffsfs_Unlock();
return retVal;
}
void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
{
yaffsfs_DeviceConfiguration *cfg;
yaffsfs_configurationList = cfgList;
yaffsfs_InitHandles();
cfg = yaffsfs_configurationList;
while(cfg && cfg->prefix && cfg->dev)
{
cfg->dev->isMounted = 0;
cfg++;
}
}
//
// Directory search stuff.
yaffs_DIR *yaffs_opendir(const char *dirname)
{
yaffs_DIR *dir = NULL;
yaffs_Object *obj = NULL;
yaffsfs_DirectorySearchContext *dsc = NULL;
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL,dirname,0);
if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
{
dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
dir = (yaffs_DIR *)dsc;
if(dsc)
{
dsc->magic = YAFFS_MAGIC;
dsc->list = NULL;
memset(dsc->name,0,NAME_MAX+1);
strncpy(dsc->name,dirname,NAME_MAX);
}
}
yaffsfs_Unlock();
return dir;
}
struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
{
yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
struct yaffs_dirent *retVal = NULL;
struct list_head *i;
yaffs_Object *entry = NULL;
int offset;
yaffs_Object *obj = NULL;
struct yaffsfs_ObjectListEntry *list = NULL;
int inList = 0;
yaffsfs_Lock();
offset = -1;
if(dsc && dsc->magic == YAFFS_MAGIC)
{
yaffsfs_SetError(0);
obj = yaffsfs_FindObject(NULL,dsc->name,0);
if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
{
list_for_each(i,&obj->variant.directoryVariant.children)
{
offset++;
entry = (i) ? list_entry(i, yaffs_Object,siblings) : NULL;
if(entry)
{
list = dsc->list;
inList = 0;
while(list && !inList)
{
if(list->objectId == entry->objectId)
{
inList = 1;
}
list = list->next;
}
if(!inList) goto foundNew;
}
}
foundNew:
if(!inList && entry)
{
//This is the entry we're going to return;
struct yaffsfs_ObjectListEntry *le;
le = YMALLOC(sizeof(struct yaffsfs_ObjectListEntry));
if(le)
{
le->next = dsc->list;
le->objectId = entry->objectId;
dsc->list = le;
dsc->de.d_ino = yaffs_GetEquivalentObject(entry)->objectId;
dsc->de.d_off = offset;
yaffs_GetObjectName(entry,dsc->de.d_name,NAME_MAX+1);
dsc->de.d_reclen = sizeof(struct yaffs_dirent);
retVal = &dsc->de;
}
}
}
}
else
{
yaffsfs_SetError(-EBADF);
}
yaffsfs_Unlock();
return retVal;
}
void yaffsfs_ListClear(yaffsfs_DirectorySearchContext *dsc)
{
struct yaffsfs_ObjectListEntry *le;
if(dsc && dsc->magic == YAFFS_MAGIC)
{
while(dsc->list)
{
le = dsc->list;
dsc->list = dsc->list->next;
YFREE(le);
}
}
}
void yaffs_rewinddir(yaffs_DIR *dirp)
{
yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
yaffsfs_Lock();
yaffsfs_ListClear(dsc);
yaffsfs_Unlock();
}
int yaffs_closedir(yaffs_DIR *dirp)
{
yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
yaffsfs_Lock();
yaffsfs_ListClear(dsc);
dsc->magic = 0;
YFREE(dsc);
yaffsfs_Unlock();
return 0;
}
int yaffs_symlink(const char *oldpath, const char *newpath)
{
yaffs_Object *parent = NULL;
yaffs_Object *obj;
char *name;
int retVal= -1;
int mode = 0; // ignore for now
yaffsfs_Lock();
parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
if(obj)
{
retVal = 0;
}
else
{
yaffsfs_SetError(-ENOSPC); // just assume no space for now
retVal = -1;
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_readlink(const char *path, char *buf, int bufsiz)
{
yaffs_Object *obj = NULL;
int retVal;
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL,path,0);
if(!obj)
{
yaffsfs_SetError(-ENOENT);
retVal = -1;
}
else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
{
yaffsfs_SetError(-EINVAL);
retVal = -1;
}
else
{
char *alias = obj->variant.symLinkVariant.alias;
memset(buf,0,bufsiz);
strncpy(buf,alias,bufsiz - 1);
retVal = 0;
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_link(const char *oldpath, const char *newpath);
int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
int yaffs_DumpDevStruct(const char *path)
{
char *rest;
yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
if(obj)
{
yaffs_Device *dev = obj->myDev;
printf("\n"
"nPageWrites.......... %d\n"
"nPageReads........... %d\n"
"nBlockErasures....... %d\n"
"nGCCopies............ %d\n"
"garbageCollections... %d\n"
"passiveGarbageColl'ns %d\n"
"\n",
dev->nPageWrites,
dev->nPageReads,
dev->nBlockErasures,
dev->nGCCopies,
dev->garbageCollections,
dev->passiveGarbageCollections
);
}
return 0;
}