/fs/yaffs2/yaffsfs.c
C | 3211 lines | 2416 code | 601 blank | 194 comment | 709 complexity | 33fce00db010ea17565c0415b31f9b07 MD5 | raw file
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- /*
- * 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,
- ¬Dir, &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, ¬Dir, &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, ¬Dir, &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,
- ¬OldDir, &oldLoop);
- newdir = yaffsfs_FindDirectory(NULL, newPath, &newname, 0,
- ¬NewDir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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(-EE…
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