diff options
Diffstat (limited to 'fs/yaffs2/direct/yaffsfs.c')
| -rw-r--r-- | fs/yaffs2/direct/yaffsfs.c | 1510 |
1 files changed, 0 insertions, 1510 deletions
diff --git a/fs/yaffs2/direct/yaffsfs.c b/fs/yaffs2/direct/yaffsfs.c deleted file mode 100644 index f62c952..0000000 --- a/fs/yaffs2/direct/yaffsfs.c +++ /dev/null @@ -1,1510 +0,0 @@ -/* - * 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 <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. - */ - -/* XXX U-BOOT XXX */ -#include <common.h> -#include <malloc.h> - -#include "yaffsfs.h" -#include "yaffs_guts.h" -#include "yaffscfg.h" -#include "yportenv.h" - -/* XXX U-BOOT XXX */ -#if 0 -#include <string.h> // for memset -#endif - -#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 = YAFFS_FAIL; - - 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; -} |