--- /dev/null
+/*
+ * 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 <charles@aleph1.co.uk>
+ *
+ * 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 <string.h> // 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 2003-01-21 03:32:17 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 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;
+ }
+
+ // 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);
+ obj = yaffs_MknodFile(dir,name,mode,0,0);
+ }
+
+ 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);
+ yaffsfs_SetError(-EACCESS);
+ 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
+ {
+ //todo error
+ }
+
+ }
+
+ 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;
+
+}
+
+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;
+ char *oldname;
+ char *newname;
+ int result= YAFFS_FAIL;
+
+ yaffsfs_Lock();
+
+ olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
+ newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
+
+ if(!olddir || !newdir)
+ {
+ // bad handle
+ yaffsfs_SetError(-EBADF);
+ }
+ else if(olddir->myDev != newdir->myDev)
+ {
+ // oops must be on same device
+ // todo error
+ yaffsfs_SetError(-EXDEV);
+ }
+ else
+ {
+ 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 = YAFFS_BYTES_PER_CHUNK;
+ buf->st_blocks = (buf->st_size + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK;
+ 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;
+
+ 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 *= YAFFS_BYTES_PER_CHUNK;
+
+ }
+ 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
+ );
+ }
+}
+
projects / yaffs / .git / blobdiff