From 0e8cc8bd92257da2e1df88cbc985e166e472ce61 Mon Sep 17 00:00:00 2001 From: William Juul Date: Thu, 15 Nov 2007 11:13:05 +0100 Subject: YAFFS2 import Direct import of yaffs as a tarball as of 20071113 from their public CVS-web at http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs2/ The code can also be imported on the command line with: export CVSROOT=:pserver:anonymous@cvs.aleph1.co.uk:/home/aleph1/cvs cvs logon (Hit return when asked for a password) cvs checkout yaffs2 Signed-off-by: William Juul Signed-off-by: Stig Olsen --- fs/yaffs2/direct/yaffsfs.c | 1505 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1505 insertions(+) create mode 100644 fs/yaffs2/direct/yaffsfs.c (limited to 'fs/yaffs2/direct/yaffsfs.c') diff --git a/fs/yaffs2/direct/yaffsfs.c b/fs/yaffs2/direct/yaffsfs.c new file mode 100644 index 0000000..a8519c2 --- /dev/null +++ b/fs/yaffs2/direct/yaffsfs.c @@ -0,0 +1,1505 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2007 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * 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 1.18 2007/07/18 19:40:38 charles Exp $"; + +// configurationList is the list of devices that are supported +static yaffsfs_DeviceConfiguration *yaffsfs_configurationList; + + +/* Some forward references */ +static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth); +static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj); + + +// Handle management. +// + + +unsigned int yaffs_wr_attempts; + +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 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. +// Curveballs: Should match paths that end in '/' too +// Curveball2 Might have "/x/ and "/x/y". Need to return the longest match +static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath) +{ + yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList; + const char *leftOver; + const char *p; + yaffs_Device *retval = NULL; + int thisMatchLength; + int longestMatch = -1; + + // Check all configs, choose the one that: + // 1) Actually matches a prefix (ie /a amd /abc will not match + // 2) Matches the longest. + while(cfg && cfg->prefix && cfg->dev) + { + leftOver = path; + p = cfg->prefix; + thisMatchLength = 0; + + while(*p && //unmatched part of prefix + strcmp(p,"/") && // the rest of the prefix is not / (to catch / at end) + *leftOver && + yaffsfs_Match(*p,*leftOver)) + { + p++; + leftOver++; + thisMatchLength++; + } + if((!*p || strcmp(p,"/") == 0) && // end of prefix + (!*leftOver || *leftOver == '/') && // no more in this path name part + (thisMatchLength > longestMatch)) + { + // Matched prefix + *restOfPath = (char *)leftOver; + retval = cfg->dev; + longestMatch = thisMatchLength; + } + cfg++; + } + return retval; +} + +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->yst_mode & S_IREAD)) + { + openDenied = 1; + } + + if( (oflag & O_RDWR) && + !(obj->yst_mode & S_IREAD)) + { + openDenied = 1; + } + + if( (oflag & (O_RDWR | O_WRONLY)) && + !(obj->yst_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; + int writeThrough = 0; + + 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,writeThrough); + + if(nWritten >= 0) + { + h->position = pos + nWritten; + } + else + { + //todo error + } + + } + + yaffsfs_Unlock(); + + + return (nWritten >= 0) ? nWritten : -1; + +} + +int yaffs_truncate(int fd, off_t 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 + { + 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->yst_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->yst_rdev; + buf->st_size = yaffs_GetObjectFileLength(obj); + buf->st_blksize = obj->myDev->nDataBytesPerChunk; + buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize; + buf->yst_atime = obj->yst_atime; + buf->yst_ctime = obj->yst_ctime; + buf->yst_mtime = obj->yst_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->yst_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 = NULL; + char *name; + int retVal= -1; + + yaffsfs_Lock(); + parent = yaffsfs_FindDirectory(NULL,path,&name,0); + if(parent) + 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; + + yaffs_FlushEntireDeviceCache(dev); + yaffs_CheckpointSave(dev); + + 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; + +} + +loff_t yaffs_freespace(const char *path) +{ + loff_t retVal=-1; + yaffs_Device *dev=NULL; + char *dummy; + + yaffsfs_Lock(); + dev = yaffsfs_FindDevice(path,&dummy); + if(dev && dev->isMounted) + { + retVal = yaffs_GetNumberOfFreeChunks(dev); + retVal *= dev->nDataBytesPerChunk; + + } + 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->dev->removeObjectCallback = yaffsfs_RemoveObjectCallback; + cfg++; + } + + +} + + +// +// Directory search stuff. + +// +// Directory search context +// +// NB this is an opaque structure. + + +typedef struct +{ + __u32 magic; + yaffs_dirent de; /* directory entry being used by this dsc */ + char name[NAME_MAX+1]; /* name of directory being searched */ + yaffs_Object *dirObj; /* ptr to directory being searched */ + yaffs_Object *nextReturn; /* obj to be returned by next readddir */ + int offset; + struct list_head others; +} yaffsfs_DirectorySearchContext; + + + +static struct list_head search_contexts; + + +static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc) +{ + if(dsc && + dsc->dirObj && + dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){ + + dsc->offset = 0; + + if( list_empty(&dsc->dirObj->variant.directoryVariant.children)){ + dsc->nextReturn = NULL; + } else { + dsc->nextReturn = list_entry(dsc->dirObj->variant.directoryVariant.children.next, + yaffs_Object,siblings); + } + } else { + /* Hey someone isn't playing nice! */ + } +} + +static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc) +{ + if(dsc && + dsc->dirObj && + dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){ + + if( dsc->nextReturn == NULL || + list_empty(&dsc->dirObj->variant.directoryVariant.children)){ + dsc->nextReturn = NULL; + } else { + struct list_head *next = dsc->nextReturn->siblings.next; + + if( next == &dsc->dirObj->variant.directoryVariant.children) + dsc->nextReturn = NULL; /* end of list */ + else + dsc->nextReturn = list_entry(next,yaffs_Object,siblings); + } + } else { + /* Hey someone isn't playing nice! */ + } +} + +static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj) +{ + + struct list_head *i; + yaffsfs_DirectorySearchContext *dsc; + + /* if search contexts not initilised then skip */ + if(!search_contexts.next) + return; + + /* Iteratethrough the directory search contexts. + * If any are the one being removed, then advance the dsc to + * the next one to prevent a hanging ptr. + */ + list_for_each(i, &search_contexts) { + if (i) { + dsc = list_entry(i, yaffsfs_DirectorySearchContext,others); + if(dsc->nextReturn == obj) + yaffsfs_DirAdvance(dsc); + } + } + +} + +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) + { + memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext)); + dsc->magic = YAFFS_MAGIC; + dsc->dirObj = obj; + strncpy(dsc->name,dirname,NAME_MAX); + INIT_LIST_HEAD(&dsc->others); + + if(!search_contexts.next) + INIT_LIST_HEAD(&search_contexts); + + list_add(&dsc->others,&search_contexts); + yaffsfs_SetDirRewound(dsc); } + + } + + yaffsfs_Unlock(); + + return dir; +} + +struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp) +{ + yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp; + struct yaffs_dirent *retVal = NULL; + + yaffsfs_Lock(); + + if(dsc && dsc->magic == YAFFS_MAGIC){ + yaffsfs_SetError(0); + if(dsc->nextReturn){ + dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId; + dsc->de.d_dont_use = (unsigned)dsc->nextReturn; + dsc->de.d_off = dsc->offset++; + yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX); + if(strlen(dsc->de.d_name) == 0) + { + // this should not happen! + strcpy(dsc->de.d_name,"zz"); + } + dsc->de.d_reclen = sizeof(struct yaffs_dirent); + retVal = &dsc->de; + yaffsfs_DirAdvance(dsc); + } else + retVal = NULL; + } + else + { + yaffsfs_SetError(-EBADF); + } + + yaffsfs_Unlock(); + + return retVal; + +} + + +void yaffs_rewinddir(yaffs_DIR *dirp) +{ + yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp; + + yaffsfs_Lock(); + + yaffsfs_SetDirRewound(dsc); + + yaffsfs_Unlock(); +} + + +int yaffs_closedir(yaffs_DIR *dirp) +{ + yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp; + + yaffsfs_Lock(); + dsc->magic = 0; + list_del(&dsc->others); /* unhook from list */ + YFREE(dsc); + yaffsfs_Unlock(); + return 0; +} + +// end of directory stuff + + +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) +{ + // Creates a link called newpath to existing oldpath + yaffs_Object *obj = NULL; + yaffs_Object *target = NULL; + int retVal = 0; + + + yaffsfs_Lock(); + + obj = yaffsfs_FindObject(NULL,oldpath,0); + target = yaffsfs_FindObject(NULL,newpath,0); + + if(!obj) + { + yaffsfs_SetError(-ENOENT); + retVal = -1; + } + else if(target) + { + yaffsfs_SetError(-EEXIST); + retVal = -1; + } + else + { + yaffs_Object *newdir = NULL; + yaffs_Object *link = NULL; + + char *newname; + + newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0); + + if(!newdir) + { + yaffsfs_SetError(-ENOTDIR); + retVal = -1; + } + else if(newdir->myDev != obj->myDev) + { + yaffsfs_SetError(-EXDEV); + retVal = -1; + } + if(newdir && strlen(newname) > 0) + { + link = yaffs_Link(newdir,newname,obj); + if(link) + retVal = 0; + else + { + yaffsfs_SetError(-ENOSPC); + retVal = -1; + } + + } + } + yaffsfs_Unlock(); + + return retVal; +} + +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; +} + -- cgit v1.1