blob: 41e5f0108cf177a6aff51479da2360388bc01892 [file] [log] [blame]
/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2011 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.
*/
#include <div64.h>
#include "yaffsfs.h"
#include "yaffs_guts.h"
#include "yaffscfg.h"
#include "yportenv.h"
#include "yaffs_trace.h"
#define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
#ifndef NULL
#define NULL ((void *)0)
#endif
/* YAFFSFS_RW_SIZE must be a power of 2 */
#define YAFFSFS_RW_SHIFT (13)
#define YAFFSFS_RW_SIZE (1<<YAFFSFS_RW_SHIFT)
/* Some forward references */
static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
const YCHAR *path,
int symDepth, int getEquiv,
struct yaffs_obj **dirOut,
int *notDir, int *loop);
static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
unsigned int yaffs_wr_attempts;
/*
* Handle management.
* There are open inodes in struct yaffsfs_Inode.
* There are open file descriptors in yaffsfs_FileDes.
* There are open handles in yaffsfs_FileDes.
*
* Things are structured this way to be like the Linux VFS model
* so that interactions with the yaffs guts calls are similar.
* That means more common code paths and less special code.
* That means better testing etc.
*
* We have 3 layers because:
* A handle is different than an fd because you can use dup()
* to create a new handle that accesses the *same* fd. The two
* handles will use the same offset (part of the fd). We only close
* down the fd when there are no more handles accessing it.
*
* More than one fd can currently access one file, but each fd
* has its own permsiions and offset.
*/
struct yaffsfs_Inode {
int count; /* Number of handles accessing this inode */
struct yaffs_obj *iObj;
};
struct yaffsfs_FileDes {
u8 reading:1;
u8 writing:1;
u8 append:1;
u8 shareRead:1;
u8 shareWrite:1;
int inodeId:12; /* Index to corresponding yaffsfs_Inode */
int handleCount:10; /* Number of handles for this fd */
loff_t position; /* current position in file */
};
struct yaffsfs_Handle {
short int fdId;
short int useCount;
};
struct yaffsfs_DirSearchContxt {
struct yaffs_dirent de; /* directory entry */
YCHAR name[NAME_MAX + 1]; /* name of directory being searched */
struct yaffs_obj *dirObj; /* ptr to directory being searched */
struct yaffs_obj *nextReturn; /* obj returned by next readddir */
struct list_head others;
int offset:20;
unsigned inUse:1;
};
static struct yaffsfs_DirSearchContxt yaffsfs_dsc[YAFFSFS_N_DSC];
static struct yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
static struct yaffsfs_FileDes yaffsfs_fd[YAFFSFS_N_HANDLES];
static struct yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
static int yaffsfs_handlesInitialised;
unsigned yaffs_set_trace(unsigned tm)
{
yaffs_trace_mask = tm;
return yaffs_trace_mask;
}
unsigned yaffs_get_trace(void)
{
return yaffs_trace_mask;
}
/*
* yaffsfs_InitHandle
* Inilitalise handle management on start-up.
*/
static void yaffsfs_InitHandles(void)
{
int i;
if (yaffsfs_handlesInitialised)
return;
memset(yaffsfs_inode, 0, sizeof(yaffsfs_inode));
memset(yaffsfs_fd, 0, sizeof(yaffsfs_fd));
memset(yaffsfs_handle, 0, sizeof(yaffsfs_handle));
memset(yaffsfs_dsc, 0, sizeof(yaffsfs_dsc));
for (i = 0; i < YAFFSFS_N_HANDLES; i++)
yaffsfs_fd[i].inodeId = -1;
for (i = 0; i < YAFFSFS_N_HANDLES; i++)
yaffsfs_handle[i].fdId = -1;
}
static struct yaffsfs_Handle *yaffsfs_HandleToPointer(int h)
{
if (h >= 0 && h < YAFFSFS_N_HANDLES)
return &yaffsfs_handle[h];
return NULL;
}
static struct yaffsfs_FileDes *yaffsfs_HandleToFileDes(int handle)
{
struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
if (h && h->useCount > 0 && h->fdId >= 0 && h->fdId < YAFFSFS_N_HANDLES)
return &yaffsfs_fd[h->fdId];
return NULL;
}
static struct yaffsfs_Inode *yaffsfs_HandleToInode(int handle)
{
struct yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle);
if (fd && fd->handleCount > 0 &&
fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES)
return &yaffsfs_inode[fd->inodeId];
return NULL;
}
static struct yaffs_obj *yaffsfs_HandleToObject(int handle)
{
struct yaffsfs_Inode *in = yaffsfs_HandleToInode(handle);
if (in)
return in->iObj;
return NULL;
}
/*
* yaffsfs_FindInodeIdForObject
* Find the inode entry for an object, if it exists.
*/
static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
{
int i;
int ret = -1;
if (obj)
obj = yaffs_get_equivalent_obj(obj);
/* Look for it in open inode table */
for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
if (yaffsfs_inode[i].iObj == obj)
ret = i;
}
return ret;
}
/*
* yaffsfs_GetInodeIdForObject
* Grab an inode entry when opening a new inode.
*/
static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
{
int i;
int ret;
struct yaffsfs_Inode *in = NULL;
if (obj)
obj = yaffs_get_equivalent_obj(obj);
ret = yaffsfs_FindInodeIdForObject(obj);
for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
if (!yaffsfs_inode[i].iObj)
ret = i;
}
if (ret >= 0) {
in = &yaffsfs_inode[ret];
if (!in->iObj)
in->count = 0;
in->iObj = obj;
in->count++;
}
return ret;
}
static int yaffsfs_CountHandles(struct yaffs_obj *obj)
{
int i = yaffsfs_FindInodeIdForObject(obj);
if (i >= 0)
return yaffsfs_inode[i].count;
else
return 0;
}
static void yaffsfs_ReleaseInode(struct yaffsfs_Inode *in)
{
struct yaffs_obj *obj;
obj = in->iObj;
if (obj->unlinked)
yaffs_del_obj(obj);
obj->my_inode = NULL;
in->iObj = NULL;
}
static void yaffsfs_PutInode(int inodeId)
{
if (inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES) {
struct yaffsfs_Inode *in = &yaffsfs_inode[inodeId];
in->count--;
if (in->count <= 0) {
yaffsfs_ReleaseInode(in);
in->count = 0;
}
}
}
static int yaffsfs_NewHandle(struct yaffsfs_Handle **hptr)
{
int i;
struct yaffsfs_Handle *h;
for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
h = &yaffsfs_handle[i];
if (h->useCount < 1) {
memset(h, 0, sizeof(struct yaffsfs_Handle));
h->fdId = -1;
h->useCount = 1;
if (hptr)
*hptr = h;
return i;
}
}
return -1;
}
static int yaffsfs_NewHandleAndFileDes(void)
{
int i;
struct yaffsfs_FileDes *fd;
struct yaffsfs_Handle *h = NULL;
int handle = yaffsfs_NewHandle(&h);
if (handle < 0)
return -1;
for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
fd = &yaffsfs_fd[i];
if (fd->handleCount < 1) {
memset(fd, 0, sizeof(struct yaffsfs_FileDes));
fd->inodeId = -1;
fd->handleCount = 1;
h->fdId = i;
return handle;
}
}
/* Dump the handle because we could not get a fd */
h->useCount = 0;
return -1;
}
/*
* yaffs_get_handle
* Increase use of handle when reading/writing a file
* Also gets the file descriptor.
*/
static int yaffsfs_GetHandle(int handle)
{
struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
if (h && h->useCount > 0) {
h->useCount++;
return 0;
}
return -1;
}
/*
* yaffs_put_handle
* Let go of a handle when closing a file or aborting an open or
* ending a read or write.
*/
static int yaffsfs_PutFileDes(int fdId)
{
struct yaffsfs_FileDes *fd;
if (fdId >= 0 && fdId < YAFFSFS_N_HANDLES) {
fd = &yaffsfs_fd[fdId];
fd->handleCount--;
if (fd->handleCount < 1) {
if (fd->inodeId >= 0) {
yaffsfs_PutInode(fd->inodeId);
fd->inodeId = -1;
}
}
}
return 0;
}
static int yaffsfs_PutHandle(int handle)
{
struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
if (h && h->useCount > 0) {
h->useCount--;
if (h->useCount < 1) {
yaffsfs_PutFileDes(h->fdId);
h->fdId = -1;
}
}
return 0;
}
static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
{
struct yaffsfs_FileDes *fd;
struct yaffsfs_Handle *h;
struct yaffs_obj *obj;
int i;
for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
h = yaffsfs_HandleToPointer(i);
fd = yaffsfs_HandleToFileDes(i);
obj = yaffsfs_HandleToObject(i);
if (h && h->useCount > 0) {
h->useCount = 0;
h->fdId = 0;
}
if (fd && fd->handleCount > 0 && obj && obj->my_dev == dev) {
fd->handleCount = 0;
yaffsfs_PutInode(fd->inodeId);
fd->inodeId = -1;
}
}
}
/*
* Stuff to handle names.
*/
#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
static int yaffs_toupper(YCHAR a)
{
if (a >= 'a' && a <= 'z')
return (a - 'a') + 'A';
else
return a;
}
int yaffsfs_Match(YCHAR a, YCHAR b)
{
return (yaffs_toupper(a) == yaffs_toupper(b));
}
#else
int yaffsfs_Match(YCHAR a, YCHAR b)
{
/* case sensitive */
return (a == b);
}
#endif
int yaffsfs_IsPathDivider(YCHAR ch)
{
const YCHAR *str = YAFFS_PATH_DIVIDERS;
while (*str) {
if (*str == ch)
return 1;
str++;
}
return 0;
}
int yaffsfs_CheckNameLength(const char *name)
{
int retVal = 0;
int nameLength = yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH + 1);
if (nameLength == 0) {
yaffsfs_SetError(-ENOENT);
retVal = -1;
} else if (nameLength > YAFFS_MAX_NAME_LENGTH) {
yaffsfs_SetError(-ENAMETOOLONG);
retVal = -1;
}
return retVal;
}
static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
{
YCHAR *alt_path = NULL;
int path_length;
int i;
/*
* We don't have a definition for max path length.
* We will use 3 * max name length instead.
*/
*ret_path = NULL;
path_length = yaffs_strnlen(path, (YAFFS_MAX_NAME_LENGTH + 1) * 3 + 1);
/* If the last character is a path divider, then we need to
* trim it back so that the name look-up works properly.
* eg. /foo/new_dir/ -> /foo/newdir
* Curveball: Need to handle multiple path dividers:
* eg. /foof/sdfse///// -> /foo/sdfse
*/
if (path_length > 0 && yaffsfs_IsPathDivider(path[path_length - 1])) {
alt_path = kmalloc(path_length + 1, 0);
if (!alt_path)
return -1;
yaffs_strcpy(alt_path, path);
for (i = path_length - 1;
i >= 0 && yaffsfs_IsPathDivider(alt_path[i]); i--)
alt_path[i] = (YCHAR) 0;
}
*ret_path = alt_path;
return 0;
}
LIST_HEAD(yaffsfs_deviceList);
/*
* yaffsfs_FindDevice
* yaffsfs_FindRoot
* Scan the configuration list to find the device
* Curveballs: Should match paths that end in '/' too
* Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
*/
static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path,
YCHAR **restOfPath)
{
struct list_head *cfg;
const YCHAR *leftOver;
const YCHAR *p;
struct yaffs_dev *retval = NULL;
struct yaffs_dev *dev = NULL;
int thisMatchLength;
int longestMatch = -1;
int matching;
/*
* Check all configs, choose the one that:
* 1) Actually matches a prefix (ie /a amd /abc will not match
* 2) Matches the longest.
*/
list_for_each(cfg, &yaffsfs_deviceList) {
dev = list_entry(cfg, struct yaffs_dev, dev_list);
leftOver = path;
p = dev->param.name;
thisMatchLength = 0;
matching = 1;
while (matching && *p && *leftOver) {
/* Skip over any /s */
while (yaffsfs_IsPathDivider(*p))
p++;
/* Skip over any /s */
while (yaffsfs_IsPathDivider(*leftOver))
leftOver++;
/* Now match the text part */
while (matching &&
*p && !yaffsfs_IsPathDivider(*p) &&
*leftOver && !yaffsfs_IsPathDivider(*leftOver)) {
if (yaffsfs_Match(*p, *leftOver)) {
p++;
leftOver++;
thisMatchLength++;
} else {
matching = 0;
}
}
}
/* Skip over any /s in leftOver */
while (yaffsfs_IsPathDivider(*leftOver))
leftOver++;
/*Skip over any /s in p */
while (yaffsfs_IsPathDivider(*p))
p++;
/* p should now be at the end of the string if fully matched */
if (*p)
matching = 0;
if (matching && (thisMatchLength > longestMatch)) {
/* Matched prefix */
*restOfPath = (YCHAR *) leftOver;
retval = dev;
longestMatch = thisMatchLength;
}
}
return retval;
}
static int yaffsfs_CheckPath(const YCHAR *path)
{
int n = 0;
int divs = 0;
while (*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100) {
if (yaffsfs_IsPathDivider(*path)) {
n = 0;
divs++;
} else
n++;
path++;
}
return (*path) ? -1 : 0;
}
/* FindMountPoint only returns a dev entry if the path is a mount point */
static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
{
struct yaffs_dev *dev;
YCHAR *restOfPath = NULL;
dev = yaffsfs_FindDevice(path, &restOfPath);
if (dev && restOfPath && *restOfPath)
dev = NULL;
return dev;
}
static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path,
YCHAR **restOfPath)
{
struct yaffs_dev *dev;
dev = yaffsfs_FindDevice(path, restOfPath);
if (dev && dev->is_mounted)
return dev->root_dir;
return NULL;
}
static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
int symDepth, int *loop)
{
if (obj)
obj = yaffs_get_equivalent_obj(obj);
while (obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
YCHAR *alias = obj->variant.symlink_variant.alias;
if (yaffsfs_IsPathDivider(*alias))
/* Starts with a /, need to scan from root up */
obj = yaffsfs_FindObject(NULL, alias, symDepth++,
1, NULL, NULL, loop);
else
/*
* Relative to here so use the parent of the
* symlink as a start
*/
obj = yaffsfs_FindObject(obj->parent, alias, symDepth++,
1, NULL, NULL, loop);
}
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 struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
const YCHAR *path,
YCHAR **name, int symDepth,
int *notDir, int *loop)
{
struct yaffs_obj *dir;
YCHAR *restOfPath;
YCHAR str[YAFFS_MAX_NAME_LENGTH + 1];
int i;
if (symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES) {
if (loop)
*loop = 1;
return NULL;
}
if (startDir) {
dir = startDir;
restOfPath = (YCHAR *) 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 (yaffsfs_IsPathDivider(*restOfPath))
restOfPath++; /* get rid of '/' */
*name = restOfPath;
i = 0;
while (*restOfPath && !yaffsfs_IsPathDivider(*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 (yaffs_strcmp(str, _Y(".")) == 0) {
/* Do nothing */
} else if (yaffs_strcmp(str, _Y("..")) == 0) {
dir = dir->parent;
} else {
dir = yaffs_find_by_name(dir, str);
dir = yaffsfs_FollowLink(dir, symDepth, loop);
if (dir && dir->variant_type !=
YAFFS_OBJECT_TYPE_DIRECTORY) {
if (notDir)
*notDir = 1;
dir = NULL;
}
}
}
}
/* directory did not exist. */
return NULL;
}
static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
const YCHAR *path,
YCHAR **name,
int symDepth,
int *notDir, int *loop)
{
return yaffsfs_DoFindDirectory(relDir, path, name, symDepth, notDir,
loop);
}
/*
* yaffsfs_FindObject turns a path for an existing object into the object
*/
static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
const YCHAR *path, int symDepth,
int getEquiv,
struct yaffs_obj **dirOut,
int *notDir, int *loop)
{
struct yaffs_obj *dir;
struct yaffs_obj *obj;
YCHAR *name;
dir =
yaffsfs_FindDirectory(relDir, path, &name, symDepth, notDir, loop);
if (dirOut)
*dirOut = dir;
if (dir && *name)
obj = yaffs_find_by_name(dir, name);
else
obj = dir;
if (getEquiv)
obj = yaffs_get_equivalent_obj(obj);
return obj;
}
/*************************************************************************
* Start of yaffsfs visible functions.
*************************************************************************/
int yaffs_dup(int handle)
{
int newHandleNumber = -1;
struct yaffsfs_FileDes *existingFD = NULL;
struct yaffsfs_Handle *existingHandle = NULL;
struct yaffsfs_Handle *newHandle = NULL;
yaffsfs_Lock();
existingHandle = yaffsfs_HandleToPointer(handle);
existingFD = yaffsfs_HandleToFileDes(handle);
if (existingFD)
newHandleNumber = yaffsfs_NewHandle(&newHandle);
if (newHandle) {
newHandle->fdId = existingHandle->fdId;
existingFD->handleCount++;
}
yaffsfs_Unlock();
if (!existingFD)
yaffsfs_SetError(-EBADF);
else if (!newHandle)
yaffsfs_SetError(-ENOMEM);
return newHandleNumber;
}
static int yaffsfs_TooManyObjects(struct yaffs_dev *dev)
{
int current_objects = dev->n_obj - dev->n_deleted_files;
if (dev->param.max_objects && current_objects > dev->param.max_objects)
return 1;
else
return 0;
}
int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
YCHAR *name;
int handle = -1;
struct yaffsfs_FileDes *fd = NULL;
int openDenied = 0;
int symDepth = 0;
int errorReported = 0;
int rwflags = oflag & (O_RDWR | O_RDONLY | O_WRONLY);
u8 shareRead = (sharing & YAFFS_SHARE_READ) ? 1 : 0;
u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
u8 sharedReadAllowed;
u8 sharedWriteAllowed;
u8 alreadyReading;
u8 alreadyWriting;
u8 readRequested;
u8 writeRequested;
int notDir = 0;
int loop = 0;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
/* O_EXCL only has meaning if O_CREAT is specified */
if (!(oflag & O_CREAT))
oflag &= ~(O_EXCL);
/* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
if ((oflag & O_CREAT) & (oflag & O_EXCL))
oflag &= ~(O_TRUNC);
/* Todo: Are there any more flag combos to sanitise ? */
/* Figure out if reading or writing is requested */
readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
yaffsfs_Lock();
handle = yaffsfs_NewHandleAndFileDes();
if (handle < 0) {
yaffsfs_SetError(-ENFILE);
errorReported = 1;
} else {
fd = yaffsfs_HandleToFileDes(handle);
/* try to find the exisiting object */
obj = yaffsfs_FindObject(NULL, path, 0, 1, NULL, NULL, NULL);
obj = yaffsfs_FollowLink(obj, symDepth++, &loop);
if (obj &&
obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
obj = NULL;
if (obj) {
/* The file already exists or it might be a directory */
/* A directory can't be opened as a file */
if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
openDenied = 1;
yaffsfs_SetError(-EISDIR);
errorReported = 1;
}
/* Open should fail if O_CREAT and O_EXCL are specified
* for a file that exists.
*/
if (!errorReported &&
(oflag & O_EXCL) && (oflag & O_CREAT)) {
openDenied = 1;
yaffsfs_SetError(-EEXIST);
errorReported = 1;
}
/* Check file permissions */
if (readRequested && !(obj->yst_mode & S_IREAD))
openDenied = 1;
if (writeRequested && !(obj->yst_mode & S_IWRITE))
openDenied = 1;
if (!errorReported && writeRequested &&
obj->my_dev->read_only) {
openDenied = 1;
yaffsfs_SetError(-EROFS);
errorReported = 1;
}
if (openDenied && !errorReported) {
yaffsfs_SetError(-EACCES);
errorReported = 1;
}
/* Check sharing of an existing object. */
if (!openDenied) {
struct yaffsfs_FileDes *fdx;
int i;
sharedReadAllowed = 1;
sharedWriteAllowed = 1;
alreadyReading = 0;
alreadyWriting = 0;
for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
fdx = &yaffsfs_fd[i];
if (fdx->handleCount > 0 &&
fdx->inodeId >= 0 &&
yaffsfs_inode[fdx->inodeId].iObj
== obj) {
if (!fdx->shareRead)
sharedReadAllowed = 0;
if (!fdx->shareWrite)
sharedWriteAllowed = 0;
if (fdx->reading)
alreadyReading = 1;
if (fdx->writing)
alreadyWriting = 1;
}
}
if ((!sharedReadAllowed && readRequested) ||
(!shareRead && alreadyReading) ||
(!sharedWriteAllowed && writeRequested) ||
(!shareWrite && alreadyWriting)) {
openDenied = 1;
yaffsfs_SetError(-EBUSY);
errorReported = 1;
}
}
}
/* If we could not open an existing object, then let's see if
* the directory exists. If not, error.
*/
if (!obj && !errorReported) {
dir = yaffsfs_FindDirectory(NULL, path, &name, 0,
&notDir, &loop);
if (!dir && notDir) {
yaffsfs_SetError(-ENOTDIR);
errorReported = 1;
} else if (loop) {
yaffsfs_SetError(-ELOOP);
errorReported = 1;
} else if (!dir) {
yaffsfs_SetError(-ENOENT);
errorReported = 1;
}
}
if (!obj && dir && !errorReported && (oflag & O_CREAT)) {
/* Let's see if we can create this file */
if (dir->my_dev->read_only) {
yaffsfs_SetError(-EROFS);
errorReported = 1;
} else if (yaffsfs_TooManyObjects(dir->my_dev)) {
yaffsfs_SetError(-ENFILE);
errorReported = 1;
} else
obj = yaffs_create_file(dir, name, mode, 0, 0);
if (!obj && !errorReported) {
yaffsfs_SetError(-ENOSPC);
errorReported = 1;
}
}
if (!obj && dir && !errorReported && !(oflag & O_CREAT)) {
yaffsfs_SetError(-ENOENT);
errorReported = 1;
}
if (obj && !openDenied) {
int inodeId = yaffsfs_GetInodeIdForObject(obj);
if (inodeId < 0) {
/*
* Todo: Fix any problem if inodes run out,
* That can't happen if the number of inode
* items >= number of handles.
*/
}
fd->inodeId = inodeId;
fd->reading = readRequested;
fd->writing = writeRequested;
fd->append = (oflag & O_APPEND) ? 1 : 0;
fd->position = 0;
fd->shareRead = shareRead;
fd->shareWrite = shareWrite;
/* Hook inode to object */
obj->my_inode = (void *)&yaffsfs_inode[inodeId];
if ((oflag & O_TRUNC) && fd->writing)
yaffs_resize_file(obj, 0);
} else {
yaffsfs_PutHandle(handle);
if (!errorReported)
yaffsfs_SetError(0); /* Problem */
handle = -1;
}
}
yaffsfs_Unlock();
return handle;
}
int yaffs_open(const YCHAR *path, int oflag, int mode)
{
return yaffs_open_sharing(path, oflag, mode,
YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
}
int yaffs_Dofsync(int handle, int datasync)
{
int retVal = -1;
struct yaffs_obj *obj;
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(handle);
if (!obj)
yaffsfs_SetError(-EBADF);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else {
yaffs_flush_file(obj, 1, datasync);
retVal = 0;
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_fsync(int handle)
{
return yaffs_Dofsync(handle, 0);
}
int yaffs_flush(int handle)
{
return yaffs_fsync(handle);
}
int yaffs_fdatasync(int handle)
{
return yaffs_Dofsync(handle, 1);
}
int yaffs_close(int handle)
{
struct yaffsfs_Handle *h = NULL;
struct yaffs_obj *obj = NULL;
int retVal = -1;
yaffsfs_Lock();
h = yaffsfs_HandleToPointer(handle);
obj = yaffsfs_HandleToObject(handle);
if (!h || !obj)
yaffsfs_SetError(-EBADF);
else {
/* clean up */
yaffs_flush_file(obj, 1, 0);
yaffsfs_PutHandle(handle);
retVal = 0;
}
yaffsfs_Unlock();
return retVal;
}
int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte,
int isPread, loff_t offset)
{
struct yaffsfs_FileDes *fd = NULL;
struct yaffs_obj *obj = NULL;
loff_t pos = 0;
loff_t startPos = 0;
loff_t endPos = 0;
int nRead = 0;
int nToRead = 0;
int totalRead = 0;
loff_t maxRead;
u8 *buf = (u8 *) vbuf;
if (!vbuf) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
fd = yaffsfs_HandleToFileDes(handle);
obj = yaffsfs_HandleToObject(handle);
if (!fd || !obj) {
/* bad handle */
yaffsfs_SetError(-EBADF);
totalRead = -1;
} else if (!fd->reading) {
/* Not a reading handle */
yaffsfs_SetError(-EINVAL);
totalRead = -1;
} else if (nbyte > YAFFS_MAX_FILE_SIZE) {
yaffsfs_SetError(-EINVAL);
totalRead = -1;
} else {
if (isPread)
startPos = offset;
else
startPos = fd->position;
pos = startPos;
if (yaffs_get_obj_length(obj) > pos)
maxRead = yaffs_get_obj_length(obj) - pos;
else
maxRead = 0;
if (nbyte > maxRead)
nbyte = maxRead;
yaffsfs_GetHandle(handle);
endPos = pos + nbyte;
if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
nbyte > YAFFS_MAX_FILE_SIZE ||
endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE) {
totalRead = -1;
nbyte = 0;
}
while (nbyte > 0) {
nToRead = YAFFSFS_RW_SIZE -
(pos & (YAFFSFS_RW_SIZE - 1));
if (nToRead > nbyte)
nToRead = nbyte;
/* Tricky bit...
* Need to reverify object in case the device was
* unmounted in another thread.
*/
obj = yaffsfs_HandleToObject(handle);
if (!obj)
nRead = 0;
else
nRead = yaffs_file_rd(obj, buf, pos, nToRead);
if (nRead > 0) {
totalRead += nRead;
pos += nRead;
buf += nRead;
}
if (nRead == nToRead)
nbyte -= nRead;
else
nbyte = 0; /* no more to read */
if (nbyte > 0) {
yaffsfs_Unlock();
yaffsfs_Lock();
}
}
yaffsfs_PutHandle(handle);
if (!isPread) {
if (totalRead >= 0)
fd->position = startPos + totalRead;
else
yaffsfs_SetError(-EINVAL);
}
}
yaffsfs_Unlock();
return (totalRead >= 0) ? totalRead : -1;
}
int yaffs_read(int handle, void *buf, unsigned int nbyte)
{
return yaffsfs_do_read(handle, buf, nbyte, 0, 0);
}
int yaffs_pread(int handle, void *buf, unsigned int nbyte, loff_t offset)
{
return yaffsfs_do_read(handle, buf, nbyte, 1, offset);
}
int yaffsfs_do_write(int handle, const void *vbuf, unsigned int nbyte,
int isPwrite, loff_t offset)
{
struct yaffsfs_FileDes *fd = NULL;
struct yaffs_obj *obj = NULL;
loff_t pos = 0;
loff_t startPos = 0;
loff_t endPos;
int nWritten = 0;
int totalWritten = 0;
int write_trhrough = 0;
int nToWrite = 0;
const u8 *buf = (const u8 *)vbuf;
if (!vbuf) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
fd = yaffsfs_HandleToFileDes(handle);
obj = yaffsfs_HandleToObject(handle);
if (!fd || !obj) {
/* bad handle */
yaffsfs_SetError(-EBADF);
totalWritten = -1;
} else if (!fd->writing) {
yaffsfs_SetError(-EINVAL);
totalWritten = -1;
} else if (obj->my_dev->read_only) {
yaffsfs_SetError(-EROFS);
totalWritten = -1;
} else {
if (fd->append)
startPos = yaffs_get_obj_length(obj);
else if (isPwrite)
startPos = offset;
else
startPos = fd->position;
yaffsfs_GetHandle(handle);
pos = startPos;
endPos = pos + nbyte;
if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
nbyte > YAFFS_MAX_FILE_SIZE ||
endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE) {
totalWritten = -1;
nbyte = 0;
}
while (nbyte > 0) {
nToWrite = YAFFSFS_RW_SIZE -
(pos & (YAFFSFS_RW_SIZE - 1));
if (nToWrite > nbyte)
nToWrite = nbyte;
/* Tricky bit...
* Need to reverify object in case the device was
* remounted or unmounted in another thread.
*/
obj = yaffsfs_HandleToObject(handle);
if (!obj || obj->my_dev->read_only)
nWritten = 0;
else
nWritten =
yaffs_wr_file(obj, buf, pos, nToWrite,
write_trhrough);
if (nWritten > 0) {
totalWritten += nWritten;
pos += nWritten;
buf += nWritten;
}
if (nWritten == nToWrite)
nbyte -= nToWrite;
else
nbyte = 0;
if (nWritten < 1 && totalWritten < 1) {
yaffsfs_SetError(-ENOSPC);
totalWritten = -1;
}
if (nbyte > 0) {
yaffsfs_Unlock();
yaffsfs_Lock();
}
}
yaffsfs_PutHandle(handle);
if (!isPwrite) {
if (totalWritten > 0)
fd->position = startPos + totalWritten;
else
yaffsfs_SetError(-EINVAL);
}
}
yaffsfs_Unlock();
return (totalWritten >= 0) ? totalWritten : -1;
}
int yaffs_write(int fd, const void *buf, unsigned int nbyte)
{
return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
}
int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, loff_t offset)
{
return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
}
int yaffs_truncate(const YCHAR *path, loff_t new_size)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int result = YAFFS_FAIL;
int notDir = 0;
int loop = 0;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
yaffsfs_SetError(-EISDIR);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
yaffsfs_SetError(-EINVAL);
else
result = yaffs_resize_file(obj, new_size);
yaffsfs_Unlock();
return (result) ? 0 : -1;
}
int yaffs_ftruncate(int handle, loff_t new_size)
{
struct yaffsfs_FileDes *fd = NULL;
struct yaffs_obj *obj = NULL;
int result = 0;
yaffsfs_Lock();
fd = yaffsfs_HandleToFileDes(handle);
obj = yaffsfs_HandleToObject(handle);
if (!fd || !obj)
/* bad handle */
yaffsfs_SetError(-EBADF);
else if (!fd->writing)
yaffsfs_SetError(-EINVAL);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
yaffsfs_SetError(-EINVAL);
else
/* resize the file */
result = yaffs_resize_file(obj, new_size);
yaffsfs_Unlock();
return (result) ? 0 : -1;
}
loff_t yaffs_lseek(int handle, loff_t offset, int whence)
{
struct yaffsfs_FileDes *fd = NULL;
struct yaffs_obj *obj = NULL;
loff_t pos = -1;
loff_t fSize = -1;
yaffsfs_Lock();
fd = yaffsfs_HandleToFileDes(handle);
obj = yaffsfs_HandleToObject(handle);
if (!fd || !obj)
yaffsfs_SetError(-EBADF);
else if (offset > YAFFS_MAX_FILE_SIZE)
yaffsfs_SetError(-EINVAL);
else {
if (whence == SEEK_SET) {
if (offset >= 0)
pos = offset;
} else if (whence == SEEK_CUR) {
if ((fd->position + offset) >= 0)
pos = (fd->position + offset);
} else if (whence == SEEK_END) {
fSize = yaffs_get_obj_length(obj);
if (fSize >= 0 && (fSize + offset) >= 0)
pos = fSize + offset;
}
if (pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
fd->position = pos;
else {
yaffsfs_SetError(-EINVAL);
pos = -1;
}
}
yaffsfs_Unlock();
return pos;
}
int yaffsfs_DoUnlink(const YCHAR *path, int isDirectory)
{
struct yaffs_obj *dir = NULL;
struct yaffs_obj *obj = NULL;
YCHAR *name;
int result = YAFFS_FAIL;
int notDir = 0;
int loop = 0;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 0, NULL, NULL, NULL);
dir = yaffsfs_FindDirectory(NULL, path, &name, 0, &notDir, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir)
yaffsfs_SetError(-ENOENT);
else if (yaffs_strncmp(name, _Y("."), 2) == 0)
yaffsfs_SetError(-EINVAL);
else if (!obj)
yaffsfs_SetError(-ENOENT);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else if (!isDirectory &&
obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
yaffsfs_SetError(-EISDIR);
else if (isDirectory &&
obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
yaffsfs_SetError(-ENOTDIR);
else if (isDirectory && obj == obj->my_dev->root_dir)
yaffsfs_SetError(-EBUSY); /* Can't rmdir a root */
else {
result = yaffs_unlinker(dir, name);
if (result == YAFFS_FAIL && isDirectory)
yaffsfs_SetError(-ENOTEMPTY);
}
yaffsfs_Unlock();
return (result == YAFFS_FAIL) ? -1 : 0;
}
int yaffs_unlink(const YCHAR *path)
{
return yaffsfs_DoUnlink(path, 0);
}
int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
{
struct yaffs_obj *olddir = NULL;
struct yaffs_obj *newdir = NULL;
struct yaffs_obj *obj = NULL;
struct yaffs_obj *newobj = NULL;
YCHAR *oldname;
YCHAR *newname;
int result = YAFFS_FAIL;
int rename_allowed = 1;
int notOldDir = 0;
int notNewDir = 0;
int oldLoop = 0;
int newLoop = 0;
YCHAR *alt_newpath = NULL;
if (!oldPath || !newPath) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(oldPath) < 0 || yaffsfs_CheckPath(newPath) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
if (yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0) {
yaffsfs_SetError(-ENOMEM);
return -1;
}
if (alt_newpath)
newPath = alt_newpath;
yaffsfs_Lock();
olddir = yaffsfs_FindDirectory(NULL, oldPath, &oldname, 0,
&notOldDir, &oldLoop);
newdir = yaffsfs_FindDirectory(NULL, newPath, &newname, 0,
&notNewDir, &newLoop);
obj = yaffsfs_FindObject(NULL, oldPath, 0, 0, NULL, NULL, NULL);
newobj = yaffsfs_FindObject(NULL, newPath, 0, 0, NULL, NULL, NULL);
/* If the object being renamed is a directory and the
* path ended with a "/" then the olddir == obj.
* We pass through NULL for the old name to tell the lower layers
* to use olddir as the object.
*/
if (olddir == obj)
oldname = NULL;
if ((!olddir && notOldDir) || (!newdir && notNewDir)) {
yaffsfs_SetError(-ENOTDIR);
rename_allowed = 0;
} else if (oldLoop || newLoop) {
yaffsfs_SetError(-ELOOP);
rename_allowed = 0;
} else if (olddir && oldname &&
yaffs_strncmp(oldname, _Y("."), 2) == 0) {
yaffsfs_SetError(-EINVAL);
rename_allowed = 0;
} else if (!olddir || !newdir || !obj) {
yaffsfs_SetError(-ENOENT);
rename_allowed = 0;
} else if (obj->my_dev->read_only) {
yaffsfs_SetError(-EROFS);
rename_allowed = 0;
} else if (yaffs_is_non_empty_dir(newobj)) {
yaffsfs_SetError(-ENOTEMPTY);
rename_allowed = 0;
} else if (olddir->my_dev != newdir->my_dev) {
/* Rename must be on same device */
yaffsfs_SetError(-EXDEV);
rename_allowed = 0;
} else if (obj && obj->variant_type == 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
*/
struct yaffs_obj *xx = newdir;
while (rename_allowed && xx) {
if (xx == obj)
rename_allowed = 0;
xx = xx->parent;
}
if (!rename_allowed)
yaffsfs_SetError(-EINVAL);
}
if (rename_allowed)
result = yaffs_rename_obj(olddir, oldname, newdir, newname);
yaffsfs_Unlock();
kfree(alt_newpath);
return (result == YAFFS_FAIL) ? -1 : 0;
}
static int yaffsfs_DoStat(struct yaffs_obj *obj, struct yaffs_stat *buf)
{
int retVal = -1;
obj = yaffs_get_equivalent_obj(obj);
if (obj && buf) {
buf->st_dev = (int)obj->my_dev->os_context;
buf->st_ino = obj->obj_id;
buf->st_mode = obj->yst_mode & ~S_IFMT;
if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
buf->st_mode |= S_IFDIR;
else if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
buf->st_mode |= S_IFLNK;
else if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
buf->st_mode |= S_IFREG;
buf->st_nlink = yaffs_get_obj_link_count(obj);
buf->st_uid = 0;
buf->st_gid = 0;
buf->st_rdev = obj->yst_rdev;
buf->st_size = yaffs_get_obj_length(obj);
buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
buf->st_blocks = lldiv(buf->st_size + buf->st_blksize - 1,
buf->st_blksize);
#if CONFIG_YAFFS_WINCE
buf->yst_wince_atime[0] = obj->win_atime[0];
buf->yst_wince_atime[1] = obj->win_atime[1];
buf->yst_wince_ctime[0] = obj->win_ctime[0];
buf->yst_wince_ctime[1] = obj->win_ctime[1];
buf->yst_wince_mtime[0] = obj->win_mtime[0];
buf->yst_wince_mtime[1] = obj->win_mtime[1];
#else
buf->yst_atime = obj->yst_atime;
buf->yst_ctime = obj->yst_ctime;
buf->yst_mtime = obj->yst_mtime;
#endif
retVal = 0;
}
return retVal;
}
static int yaffsfs_DoStatOrLStat(const YCHAR *path,
struct yaffs_stat *buf, int doLStat)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int retVal = -1;
int notDir = 0;
int loop = 0;
if (!path || !buf) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
if (!doLStat && obj)
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else
retVal = yaffsfs_DoStat(obj, buf);
yaffsfs_Unlock();
return retVal;
}
int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
{
return yaffsfs_DoStatOrLStat(path, buf, 0);
}
int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
{
return yaffsfs_DoStatOrLStat(path, buf, 1);
}
int yaffs_fstat(int fd, struct yaffs_stat *buf)
{
struct yaffs_obj *obj;
int retVal = -1;
if (!buf) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj)
retVal = yaffsfs_DoStat(obj, buf);
else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
static int yaffsfs_DoUtime(struct yaffs_obj *obj,
const struct yaffs_utimbuf *buf)
{
int retVal = -1;
int result;
struct yaffs_utimbuf local;
obj = yaffs_get_equivalent_obj(obj);
if (obj && obj->my_dev->read_only) {
yaffsfs_SetError(-EROFS);
return -1;
}
if (!buf) {
local.actime = Y_CURRENT_TIME;
local.modtime = local.actime;
buf = &local;
}
if (obj) {
obj->yst_atime = buf->actime;
obj->yst_mtime = buf->modtime;
obj->dirty = 1;
result = yaffs_flush_file(obj, 0, 0);
retVal = result == YAFFS_OK ? 0 : -1;
}
return retVal;
}
int yaffs_utime(const YCHAR *path, const struct yaffs_utimbuf *buf)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int retVal = -1;
int notDir = 0;
int loop = 0;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else
retVal = yaffsfs_DoUtime(obj, buf);
yaffsfs_Unlock();
return retVal;
}
int yaffs_futime(int fd, const struct yaffs_utimbuf *buf)
{
struct yaffs_obj *obj;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj)
retVal = yaffsfs_DoUtime(obj, buf);
else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
#ifndef CONFIG_YAFFS_WINCE
/* xattrib functions */
static int yaffs_do_setxattr(const YCHAR *path, const char *name,
const void *data, int size, int flags, int follow)
{
struct yaffs_obj *obj;
struct yaffs_obj *dir;
int notDir = 0;
int loop = 0;
int retVal = -1;
if (!path || !name || !data) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
if (follow)
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else {
retVal = yaffs_set_xattrib(obj, name, data, size, flags);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_setxattr(const YCHAR *path, const char *name,
const void *data, int size, int flags)
{
return yaffs_do_setxattr(path, name, data, size, flags, 1);
}
int yaffs_lsetxattr(const YCHAR *path, const char *name,
const void *data, int size, int flags)
{
return yaffs_do_setxattr(path, name, data, size, flags, 0);
}
int yaffs_fsetxattr(int fd, const char *name,
const void *data, int size, int flags)
{
struct yaffs_obj *obj;
int retVal = -1;
if (!name || !data) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (!obj)
yaffsfs_SetError(-EBADF);
else {
retVal = yaffs_set_xattrib(obj, name, data, size, flags);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
}
yaffsfs_Unlock();
return retVal;
}
static int yaffs_do_getxattr(const YCHAR *path, const char *name,
void *data, int size, int follow)
{
struct yaffs_obj *obj;
struct yaffs_obj *dir;
int retVal = -1;
int notDir = 0;
int loop = 0;
if (!path || !name || !data) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
if (follow)
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else {
retVal = yaffs_get_xattrib(obj, name, data, size);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
{
return yaffs_do_getxattr(path, name, data, size, 1);
}
int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
{
return yaffs_do_getxattr(path, name, data, size, 0);
}
int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
{
struct yaffs_obj *obj;
int retVal = -1;
if (!name || !data) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj) {
retVal = yaffs_get_xattrib(obj, name, data, size);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
} else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
static int yaffs_do_listxattr(const YCHAR *path, char *data,
int size, int follow)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int retVal = -1;
int notDir = 0;
int loop = 0;
if (!path || !data) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
if (follow)
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else {
retVal = yaffs_list_xattrib(obj, data, size);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_listxattr(const YCHAR *path, char *data, int size)
{
return yaffs_do_listxattr(path, data, size, 1);
}
int yaffs_llistxattr(const YCHAR *path, char *data, int size)
{
return yaffs_do_listxattr(path, data, size, 0);
}
int yaffs_flistxattr(int fd, char *data, int size)
{
struct yaffs_obj *obj;
int retVal = -1;
if (!data) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj) {
retVal = yaffs_list_xattrib(obj, data, size);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
} else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
static int yaffs_do_removexattr(const YCHAR *path, const char *name,
int follow)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int notDir = 0;
int loop = 0;
int retVal = -1;
if (!path || !name) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
if (follow)
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else {
retVal = yaffs_remove_xattrib(obj, name);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
}
yaffsfs_Unlock();
return retVal;
}
int yaffs_removexattr(const YCHAR *path, const char *name)
{
return yaffs_do_removexattr(path, name, 1);
}
int yaffs_lremovexattr(const YCHAR *path, const char *name)
{
return yaffs_do_removexattr(path, name, 0);
}
int yaffs_fremovexattr(int fd, const char *name)
{
struct yaffs_obj *obj;
int retVal = -1;
if (!name) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj) {
retVal = yaffs_remove_xattrib(obj, name);
if (retVal < 0) {
yaffsfs_SetError(retVal);
retVal = -1;
}
} else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
#endif
#ifdef CONFIG_YAFFS_WINCE
int yaffs_get_wince_times(int fd, unsigned *wctime,
unsigned *watime, unsigned *wmtime)
{
struct yaffs_obj *obj;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj) {
if (wctime) {
wctime[0] = obj->win_ctime[0];
wctime[1] = obj->win_ctime[1];
}
if (watime) {
watime[0] = obj->win_atime[0];
watime[1] = obj->win_atime[1];
}
if (wmtime) {
wmtime[0] = obj->win_mtime[0];
wmtime[1] = obj->win_mtime[1];
}
retVal = 0;
} else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
int yaffs_set_wince_times(int fd,
const unsigned *wctime,
const unsigned *watime, const unsigned *wmtime)
{
struct yaffs_obj *obj;
int result;
int retVal = -1;
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (obj) {
if (wctime) {
obj->win_ctime[0] = wctime[0];
obj->win_ctime[1] = wctime[1];
}
if (watime) {
obj->win_atime[0] = watime[0];
obj->win_atime[1] = watime[1];
}
if (wmtime) {
obj->win_mtime[0] = wmtime[0];
obj->win_mtime[1] = wmtime[1];
}
obj->dirty = 1;
result = yaffs_flush_file(obj, 0, 0);
retVal = 0;
} else
/* bad handle */
yaffsfs_SetError(-EBADF);
yaffsfs_Unlock();
return retVal;
}
#endif
static int yaffsfs_DoChMod(struct yaffs_obj *obj, mode_t mode)
{
int result = -1;
if (obj)
obj = yaffs_get_equivalent_obj(obj);
if (obj) {
obj->yst_mode = mode;
obj->dirty = 1;
result = yaffs_flush_file(obj, 0, 0);
}
return result == YAFFS_OK ? 0 : -1;
}
int yaffs_access(const YCHAR *path, int amode)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int notDir = 0;
int loop = 0;
int retval = -1;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
if (amode & ~(R_OK | W_OK | X_OK)) {
yaffsfs_SetError(-EINVAL);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else if ((amode & W_OK) && obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else {
int access_ok = 1;
if ((amode & R_OK) && !(obj->yst_mode & S_IREAD))
access_ok = 0;
if ((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
access_ok = 0;
if ((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
access_ok = 0;
if (!access_ok)
yaffsfs_SetError(-EACCES);
else
retval = 0;
}
yaffsfs_Unlock();
return retval;
}
int yaffs_chmod(const YCHAR *path, mode_t mode)
{
struct yaffs_obj *obj = NULL;
struct yaffs_obj *dir = NULL;
int retVal = -1;
int notDir = 0;
int loop = 0;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
if (mode & ~(0777)) {
yaffsfs_SetError(-EINVAL);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
obj = yaffsfs_FollowLink(obj, 0, &loop);
if (!dir && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!dir || !obj)
yaffsfs_SetError(-ENOENT);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else
retVal = yaffsfs_DoChMod(obj, mode);
yaffsfs_Unlock();
return retVal;
}
int yaffs_fchmod(int fd, mode_t mode)
{
struct yaffs_obj *obj;
int retVal = -1;
if (mode & ~(0777)) {
yaffsfs_SetError(-EINVAL);
return -1;
}
yaffsfs_Lock();
obj = yaffsfs_HandleToObject(fd);
if (!obj)
yaffsfs_SetError(-EBADF);
else if (obj->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else
retVal = yaffsfs_DoChMod(obj, mode);
yaffsfs_Unlock();
return retVal;
}
int yaffs_mkdir(const YCHAR *path, mode_t mode)
{
struct yaffs_obj *parent = NULL;
struct yaffs_obj *dir = NULL;
YCHAR *name;
YCHAR *alt_path = NULL;
int retVal = -1;
int notDir = 0;
int loop = 0;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
yaffsfs_SetError(-ENOMEM);
return -1;
}
if (alt_path)
path = alt_path;
yaffsfs_Lock();
parent = yaffsfs_FindDirectory(NULL, path, &name, 0, &notDir, &loop);
if (!parent && notDir)
yaffsfs_SetError(-ENOTDIR);
else if (loop)
yaffsfs_SetError(-ELOOP);
else if (!parent)
yaffsfs_SetError(-ENOENT);
else if (yaffsfs_TooManyObjects(parent->my_dev))
yaffsfs_SetError(-ENFILE);
else if (yaffs_strnlen(name, 5) == 0) {
/* Trying to make the root itself */
yaffsfs_SetError(-EEXIST);
} else if (parent->my_dev->read_only)
yaffsfs_SetError(-EROFS);
else {
dir = yaffs_create_dir(parent, name, mode, 0, 0);
if (dir)
retVal = 0;
else if (yaffs_find_by_name(parent, name))
yaffsfs_SetError(-EEXIST); /* name exists */
else
yaffsfs_SetError(-ENOSPC); /* assume no space */
}
yaffsfs_Unlock();
kfree(alt_path);
return retVal;
}
int yaffs_rmdir(const YCHAR *path)
{
int result;
YCHAR *alt_path;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
yaffsfs_SetError(-ENOMEM);
return -1;
}
if (alt_path)
path = alt_path;
result = yaffsfs_DoUnlink(path, 1);
kfree(alt_path);
return result;
}
void *yaffs_getdev(const YCHAR *path)
{
struct yaffs_dev *dev = NULL;
YCHAR *dummy;
dev = yaffsfs_FindDevice(path, &dummy);
return (void *)dev;
}
int yaffs_mount_common(const YCHAR *path, int read_only, int skip_checkpt)
{
int retVal = -1;
int result = YAFFS_FAIL;
struct yaffs_dev *dev = NULL;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
yaffs_trace(YAFFS_TRACE_MOUNT, "yaffs: Mounting %s", path);
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
yaffsfs_InitHandles();
dev = yaffsfs_FindMountPoint(path);
if (dev) {
if (!dev->is_mounted) {
dev->read_only = read_only ? 1 : 0;
if (skip_checkpt) {
u8 skip = dev->param.skip_checkpt_rd;
dev->param.skip_checkpt_rd = 1;
result = yaffs_guts_initialise(dev);
dev->param.skip_checkpt_rd = skip;
} else {
result = yaffs_guts_initialise(dev);
}
if (result == YAFFS_FAIL)
yaffsfs_SetError(-ENOMEM);
retVal = result ? 0 : -1;
} else
yaffsfs_SetError(-EBUSY);
} else
yaffsfs_SetError(-ENODEV);
yaffsfs_Unlock();
return retVal;
}
int yaffs_mount2(const YCHAR *path, int readonly)
{
return yaffs_mount_common(path, readonly, 0);
}
int yaffs_mount(const YCHAR *path)
{
return yaffs_mount_common(path, 0, 0);
}
int yaffs_sync(const YCHAR *path)
{
int retVal = -1;
struct yaffs_dev *dev = NULL;
YCHAR *dummy;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path, &dummy);
if (dev) {
if (!dev->is_mounted)
yaffsfs_SetError(-EINVAL);
else if (dev->read_only)
yaffsfs_SetError(-EROFS);
else {
yaffs_flush_whole_cache(dev);
yaffs_checkpoint_save(dev);
retVal = 0;
}
} else
yaffsfs_SetError(-ENODEV);
yaffsfs_Unlock();
return retVal;
}
static int yaffsfs_IsDevBusy(struct yaffs_dev *dev)
{
int i;
struct yaffs_obj *obj;
for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
obj = yaffsfs_HandleToObject(i);
if (obj && obj->my_dev == dev)
return 1;
}
return 0;
}
int yaffs_remount(const YCHAR *path, int force, int read_only)
{
int retVal = -1;
struct yaffs_dev *dev = NULL;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
dev = yaffsfs_FindMountPoint(path);
if (dev) {
if (dev->is_mounted) {
yaffs_flush_whole_cache(dev);
if (force || !yaffsfs_IsDevBusy(dev)) {
if (read_only)
yaffs_checkpoint_save(dev);
dev->read_only = read_only ? 1 : 0;
retVal = 0;
} else
yaffsfs_SetError(-EBUSY);
} else
yaffsfs_SetError(-EINVAL);
} else
yaffsfs_SetError(-ENODEV);
yaffsfs_Unlock();
return retVal;
}
int yaffs_unmount2(const YCHAR *path, int force)
{
int retVal = -1;
struct yaffs_dev *dev = NULL;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
dev = yaffsfs_FindMountPoint(path);
if (dev) {
if (dev->is_mounted) {
int inUse;
yaffs_flush_whole_cache(dev);
yaffs_checkpoint_save(dev);
inUse = yaffsfs_IsDevBusy(dev);
if (!inUse || force) {
if (inUse)
yaffsfs_BreakDeviceHandles(dev);
yaffs_deinitialise(dev);
retVal = 0;
} else
yaffsfs_SetError(-EBUSY);
} else
yaffsfs_SetError(-EINVAL);
} else
yaffsfs_SetError(-ENODEV);
yaffsfs_Unlock();
return retVal;
}
int yaffs_unmount(const YCHAR *path)
{
return yaffs_unmount2(path, 0);
}
loff_t yaffs_freespace(const YCHAR *path)
{
loff_t retVal = -1;
struct yaffs_dev *dev = NULL;
YCHAR *dummy;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path, &dummy);
if (dev && dev->is_mounted) {
retVal = yaffs_get_n_free_chunks(dev);
retVal *= dev->data_bytes_per_chunk;
} else
yaffsfs_SetError(-EINVAL);
yaffsfs_Unlock();
return retVal;
}
loff_t yaffs_totalspace(const YCHAR *path)
{
loff_t retVal = -1;
struct yaffs_dev *dev = NULL;
YCHAR *dummy;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path, &dummy);
if (dev && dev->is_mounted) {
retVal = (dev->param.end_block - dev->param.start_block + 1) -
dev->param.n_reserved_blocks;
retVal *= dev->param.chunks_per_block;
retVal *= dev->data_bytes_per_chunk;
} else
yaffsfs_SetError(-EINVAL);
yaffsfs_Unlock();
return retVal;
}
int yaffs_inodecount(const YCHAR *path)
{
loff_t retVal = -1;
struct yaffs_dev *dev = NULL;
YCHAR *dummy;
if (!path) {
yaffsfs_SetError(-EFAULT);
return -1;
}
if (yaffsfs_CheckPath(path) < 0) {
yaffsfs_SetError(-ENAMETOOLONG);
return -1;
}
yaffsfs_Lock();
dev = yaffsfs_FindDevice(path, &dummy);
if (dev && dev->is_mounted) {
int n_obj = dev->n_obj;
if (n_obj > dev->n_hardlinks)
retVal = n_obj - dev->n_hardlinks;
}
if (retVal < 0)
yaffsfs_SetError(-EINVAL);
yaffsfs_Unlock();
return retVal;
}
void yaffs_add_device(struct yaffs_dev *dev)
{
struct list_head *cfg;
/* First check that the device is not in the list. */
list_for_each(cfg, &yaffsfs_deviceList) {
if (dev == list_entry(cfg, struct yaffs_dev, dev_list))
return;
}
dev->is_mounted = 0;
dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
if (!dev->dev_list.next)
INIT_LIST_HEAD(&dev->dev_list);
list_add(&dev->dev_list, &yaffsfs_deviceList);
}
void yaffs_remove_device(struct yaffs_dev *dev)
{
list_del_init(&dev->dev_list);
}
/* Functions to iterate through devices. NB Use with extreme care! */
static struct list_head *dev_iterator;
void yaffs_dev_rewind(void)
{
dev_iterator = yaffsfs_deviceList.next;
}
struct yaffs_dev *yaffs_next_dev(void)
{
struct yaffs_dev *retval;
if (!dev_iterator)
return NULL;
if (dev_iterator == &yaffsfs_deviceList)
return NULL;
retval = list_entry(dev_iterator, struct yaffs_dev, dev_list);
dev_iterator = dev_iterator->next;
return retval;
}
/* Directory search stuff. */
static struct list_head search_contexts;
static void yaffsfs_SetDirRewound(struct yaffsfs_DirSearchContxt *dsc)
{
if (dsc &&
dsc->dirObj &&
dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
dsc->offset = 0;
if (list_empty(&dsc->dirObj->variant.dir_variant.children))
dsc->nextReturn = NULL;
else
dsc->nextReturn =
list_entry(dsc->dirObj->variant.dir_variant.
children.next, struct yaffs_obj,
siblings);
} else {
/* Hey someone isn't playing nice! */
}
}
static void yaffsfs_DirAdvance(struct yaffsfs_DirSearchContxt *dsc)
{
if (dsc &&
dsc->dirObj &&
dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
if (dsc->nextReturn == NULL ||
list_empty(&dsc->dirObj->variant.dir_variant.children))
dsc->nextReturn = NULL;