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yaffs_vfs_single.c
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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 <[email protected]>
* Acknowledgements:
* Luc van OostenRyck for numerous patches.
* Nick Bane for numerous patches.
* Nick Bane for 2.5/2.6 integration.
* Andras Toth for mknod rdev issue.
* Michael Fischer for finding the problem with inode inconsistency.
* Some code bodily lifted from JFFS
*
* 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.
*/
/*
*
* This is the file system front-end to YAFFS that hooks it up to
* the VFS.
*
* Special notes:
* >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
* this superblock
* >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
* superblock
* >> inode->u.generic_ip points to the associated struct yaffs_obj.
*/
/*
* NB There are two variants of Linux VFS glue code. This variant supports
* a single version and should not include any multi-version code.
*/
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/exportfs.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/freezer.h>
#include <asm/div64.h>
#include <linux/statfs.h>
#include <linux/uaccess.h>
#include <linux/mtd/mtd.h>
#include "yportenv.h"
#include "yaffs_trace.h"
#include "yaffs_guts.h"
#include "yaffs_attribs.h"
#include "yaffs_linux.h"
#include "yaffs_mtdif.h"
#include "yaffs_mtdif1.h"
#include "yaffs_mtdif2.h"
unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
unsigned int yaffs_auto_checkpoint = 1;
unsigned int yaffs_gc_control = 1;
unsigned int yaffs_bg_enable = 1;
unsigned int yaffs_auto_select = 1;
/* Module Parameters */
module_param(yaffs_trace_mask, uint, 0644);
module_param(yaffs_wr_attempts, uint, 0644);
module_param(yaffs_auto_checkpoint, uint, 0644);
module_param(yaffs_gc_control, uint, 0644);
module_param(yaffs_bg_enable, uint, 0644);
module_param(yaffs_auto_select, uint, 0644);
#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
{
uint64_t result = partition_size;
do_div(result, block_size);
return (uint32_t) result;
}
#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
#define yaffs_inode_to_obj(iptr)\
((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
#define update_dir_time(dir) do {\
(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
} while (0)
static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
{
return yaffs_gc_control;
}
static void yaffs_gross_lock(struct yaffs_dev *dev)
{
yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
}
static void yaffs_gross_unlock(struct yaffs_dev *dev)
{
yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
}
static void yaffs_fill_inode_from_obj(struct inode *inode,
struct yaffs_obj *obj);
static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
{
struct inode *inode;
struct yaffs_obj *obj;
struct yaffs_dev *dev = yaffs_super_to_dev(sb);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
/* NB This is called as a side effect of other functions, but
* we had to release the lock to prevent deadlocks, so
* need to lock again.
*/
yaffs_gross_lock(dev);
obj = yaffs_find_by_number(dev, inode->i_ino);
yaffs_fill_inode_from_obj(inode, obj);
yaffs_gross_unlock(dev);
unlock_new_inode(inode);
return inode;
}
struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
struct yaffs_obj *obj)
{
struct inode *inode;
if (!sb) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_get_inode for NULL super_block!!");
return NULL;
}
if (!obj) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_get_inode for NULL object!!");
return NULL;
}
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_get_inode for object %d",
obj->obj_id);
inode = yaffs_iget(sb, obj->obj_id);
if (IS_ERR(inode))
return NULL;
/* NB Side effect: iget calls back to yaffs_read_inode(). */
/* iget also increments the inode's i_count */
/* NB You can't be holding gross_lock or deadlock will happen! */
return inode;
}
static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
dev_t rdev)
{
struct inode *inode;
struct yaffs_obj *obj = NULL;
struct yaffs_dev *dev;
struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
int error;
uid_t uid = current->cred->fsuid;
gid_t gid =
(dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
mode |= S_ISGID;
if (!parent) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_mknod: could not get parent object");
return -EPERM;
}
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_mknod: parent object %d type %d",
parent->obj_id, parent->variant_type);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_mknod: making oject for %s, mode %x dev %x",
dentry->d_name.name, mode, rdev);
dev = parent->my_dev;
yaffs_gross_lock(dev);
if (yaffs_get_n_free_chunks(dev) < 1) {
error = -ENOSPC;
goto err_out;
}
switch (mode & S_IFMT) {
default:
/* Special (socket, fifo, device...) */
yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
obj =
yaffs_create_special(parent, dentry->d_name.name, mode, uid,
gid, old_encode_dev(rdev));
break;
case S_IFREG: /* file */
yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
gid);
break;
case S_IFDIR: /* directory */
yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
uid, gid);
break;
case S_IFLNK: /* symlink */
yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
obj = NULL; /* Do we ever get here? */
break;
}
if (!obj) {
error = -ENOMEM;
goto err_out;
}
/* Can not call yaffs_get_inode() with gross lock held */
yaffs_gross_unlock(dev);
inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
d_instantiate(dentry, inode);
update_dir_time(dir);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_mknod created object %d count = %d",
obj->obj_id, atomic_read(&inode->i_count));
yaffs_fill_inode_from_obj(dir, parent);
return 0;
err_out:
yaffs_gross_unlock(dev);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod error %d", error);
return error;
}
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
}
static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *n)
{
return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
}
static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
struct yaffs_obj *obj = NULL;
struct yaffs_obj *link = NULL;
struct yaffs_dev *dev;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
obj = yaffs_inode_to_obj(inode);
dev = obj->my_dev;
yaffs_gross_lock(dev);
if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
link =
yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
obj);
if (link) {
set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
d_instantiate(dentry, old_dentry->d_inode);
atomic_inc(&old_dentry->d_inode->i_count);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_link link count %d i_count %d",
old_dentry->d_inode->i_nlink,
atomic_read(&old_dentry->d_inode->i_count));
}
yaffs_gross_unlock(dev);
if (link) {
update_dir_time(dir);
return 0;
}
return -EPERM;
}
static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
struct inode *inode;
uid_t uid = current->cred->fsuid;
gid_t gid =
(dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
YAFFS_MAX_NAME_LENGTH)
return -ENAMETOOLONG;
if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
YAFFS_MAX_ALIAS_LENGTH)
return -ENAMETOOLONG;
dev = yaffs_inode_to_obj(dir)->my_dev;
yaffs_gross_lock(dev);
obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
S_IFLNK | S_IRWXUGO, uid, gid, symname);
yaffs_gross_unlock(dev);
if (!obj) {
yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
return -ENOMEM;
}
inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
d_instantiate(dentry, inode);
update_dir_time(dir);
yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
return 0;
}
static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *n)
{
struct yaffs_obj *obj;
struct inode *inode = NULL;
struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
if (current != yaffs_dev_to_lc(dev)->readdir_process)
yaffs_gross_lock(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_lookup for %d:%s",
yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
/* Can't hold gross lock when calling yaffs_get_inode() */
if (current != yaffs_dev_to_lc(dev)->readdir_process)
yaffs_gross_unlock(dev);
if (obj) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_lookup found %d", obj->obj_id);
inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
if (inode) {
yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
d_add(dentry, inode);
/* return dentry; */
return NULL;
}
} else {
yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
}
d_add(dentry, inode);
return NULL;
}
static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
{
int ret_val;
struct yaffs_dev *dev;
struct yaffs_obj *obj;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_unlink %d:%s",
(int)(dir->i_ino), dentry->d_name.name);
obj = yaffs_inode_to_obj(dir);
dev = obj->my_dev;
yaffs_gross_lock(dev);
ret_val = yaffs_unlinker(obj, dentry->d_name.name);
if (ret_val == YAFFS_OK) {
inode_dec_link_count(dentry->d_inode);
dir->i_version++;
yaffs_gross_unlock(dev);
update_dir_time(dir);
return 0;
}
yaffs_gross_unlock(dev);
return -ENOTEMPTY;
}
static int yaffs_sync_object(struct file *file,
loff_t start, loff_t end, int datasync)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
struct dentry *dentry = file->f_path.dentry;
obj = yaffs_dentry_to_obj(dentry);
dev = obj->my_dev;
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
yaffs_gross_lock(dev);
yaffs_flush_file(obj, 1, datasync);
yaffs_gross_unlock(dev);
return 0;
}
/*
* The VFS layer already does all the dentry stuff for rename.
*
* NB: POSIX says you can rename an object over an old object of the same name
*/
static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct yaffs_dev *dev;
int ret_val = YAFFS_FAIL;
struct yaffs_obj *target;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
dev = yaffs_inode_to_obj(old_dir)->my_dev;
yaffs_gross_lock(dev);
/* Check if the target is an existing directory that is not empty. */
target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
new_dentry->d_name.name);
if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
!list_empty(&target->variant.dir_variant.children)) {
yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
ret_val = YAFFS_FAIL;
} else {
/* Now does unlinking internally using shadowing mechanism */
yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
old_dentry->d_name.name,
yaffs_inode_to_obj(new_dir),
new_dentry->d_name.name);
}
yaffs_gross_unlock(dev);
if (ret_val == YAFFS_OK) {
if (target)
inode_dec_link_count(new_dentry->d_inode);
update_dir_time(old_dir);
if (old_dir != new_dir)
update_dir_time(new_dir);
return 0;
} else {
return -ENOTEMPTY;
}
}
static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
int error = 0;
struct yaffs_dev *dev;
int result;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_setattr of object %d",
yaffs_inode_to_obj(inode)->obj_id);
/* Fail if a requested resize >= 2GB */
if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
error = -EINVAL;
if (!error)
error = inode_change_ok(inode, attr);
if (!error) {
setattr_copy(inode, attr);
yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
if (attr->ia_valid & ATTR_SIZE) {
truncate_setsize(inode, attr->ia_size);
inode->i_blocks = (inode->i_size + 511) >> 9;
}
dev = yaffs_inode_to_obj(inode)->my_dev;
if (attr->ia_valid & ATTR_SIZE) {
yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
(int)(attr->ia_size),
(int)(attr->ia_size));
}
yaffs_gross_lock(dev);
result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
if (result != YAFFS_OK)
error = -EPERM;
yaffs_gross_unlock(dev);
}
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
return error;
}
static int yaffs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
int error;
struct yaffs_dev *dev;
struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
dev = obj->my_dev;
yaffs_gross_lock(dev);
error = yaffs_set_xattrib(obj, name, value, size, flags);
yaffs_gross_unlock(dev);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
return error;
}
static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
void *buff, size_t size)
{
struct inode *inode = dentry->d_inode;
int error;
struct yaffs_dev *dev;
struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_getxattr \"%s\" from object %d",
name, obj->obj_id);
dev = obj->my_dev;
yaffs_gross_lock(dev);
error = yaffs_get_xattrib(obj, name, buff, size);
yaffs_gross_unlock(dev);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
return error;
}
static int yaffs_removexattr(struct dentry *dentry, const char *name)
{
struct inode *inode = dentry->d_inode;
int error;
struct yaffs_dev *dev;
struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_removexattr of object %d", obj->obj_id);
dev = obj->my_dev;
yaffs_gross_lock(dev);
error = yaffs_remove_xattrib(obj, name);
yaffs_gross_unlock(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_removexattr done returning %d", error);
return error;
}
static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
{
struct inode *inode = dentry->d_inode;
int error;
struct yaffs_dev *dev;
struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_listxattr of object %d", obj->obj_id);
dev = obj->my_dev;
yaffs_gross_lock(dev);
error = yaffs_list_xattrib(obj, buff, size);
yaffs_gross_unlock(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_listxattr done returning %d", error);
return error;
}
static const struct inode_operations yaffs_dir_inode_operations = {
.create = yaffs_create,
.lookup = yaffs_lookup,
.link = yaffs_link,
.unlink = yaffs_unlink,
.symlink = yaffs_symlink,
.mkdir = yaffs_mkdir,
.rmdir = yaffs_unlink,
.mknod = yaffs_mknod,
.rename = yaffs_rename,
.setattr = yaffs_setattr,
.setxattr = yaffs_setxattr,
.getxattr = yaffs_getxattr,
.listxattr = yaffs_listxattr,
.removexattr = yaffs_removexattr,
};
/*-----------------------------------------------------------------*/
/* Directory search context allows us to unlock access to yaffs during
* filldir without causing problems with the directory being modified.
* This is similar to the tried and tested mechanism used in yaffs direct.
*
* A search context iterates along a doubly linked list of siblings in the
* directory. If the iterating object is deleted then this would corrupt
* the list iteration, likely causing a crash. The search context avoids
* this by using the remove_obj_fn to move the search context to the
* next object before the object is deleted.
*
* Many readdirs (and thus seach conexts) may be alive simulateously so
* each struct yaffs_dev has a list of these.
*
* A seach context lives for the duration of a readdir.
*
* All these functions must be called while yaffs is locked.
*/
struct yaffs_search_context {
struct yaffs_dev *dev;
struct yaffs_obj *dir_obj;
struct yaffs_obj *next_return;
struct list_head others;
};
/*
* yaffs_new_search() creates a new search context, initialises it and
* adds it to the device's search context list.
*
* Called at start of readdir.
*/
static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
{
struct yaffs_dev *dev = dir->my_dev;
struct yaffs_search_context *sc =
kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
if (!sc)
return NULL;
sc->dir_obj = dir;
sc->dev = dev;
if (list_empty(&sc->dir_obj->variant.dir_variant.children))
sc->next_return = NULL;
else
sc->next_return =
list_entry(dir->variant.dir_variant.children.next,
struct yaffs_obj, siblings);
INIT_LIST_HEAD(&sc->others);
list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
return sc;
}
/*
* yaffs_search_end() disposes of a search context and cleans up.
*/
static void yaffs_search_end(struct yaffs_search_context *sc)
{
if (sc) {
list_del(&sc->others);
kfree(sc);
}
}
/*
* yaffs_search_advance() moves a search context to the next object.
* Called when the search iterates or when an object removal causes
* the search context to be moved to the next object.
*/
static void yaffs_search_advance(struct yaffs_search_context *sc)
{
if (!sc)
return;
if (sc->next_return == NULL ||
list_empty(&sc->dir_obj->variant.dir_variant.children))
sc->next_return = NULL;
else {
struct list_head *next = sc->next_return->siblings.next;
if (next == &sc->dir_obj->variant.dir_variant.children)
sc->next_return = NULL; /* end of list */
else
sc->next_return =
list_entry(next, struct yaffs_obj, siblings);
}
}
/*
* yaffs_remove_obj_callback() is called when an object is unlinked.
* We check open search contexts and advance any which are currently
* on the object being iterated.
*/
static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
{
struct list_head *i;
struct yaffs_search_context *sc;
struct list_head *search_contexts =
&(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
/* Iterate through the directory search contexts.
* If any are currently on the object being removed, then advance
* the search context to the next object to prevent a hanging pointer.
*/
list_for_each(i, search_contexts) {
sc = list_entry(i, struct yaffs_search_context, others);
if (sc->next_return == obj)
yaffs_search_advance(sc);
}
}
static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
struct yaffs_search_context *sc;
struct inode *inode = f->f_dentry->d_inode;
unsigned long offset, curoffs;
struct yaffs_obj *l;
int ret_val = 0;
char name[YAFFS_MAX_NAME_LENGTH + 1];
obj = yaffs_dentry_to_obj(f->f_dentry);
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_dev_to_lc(dev)->readdir_process = current;
offset = f->f_pos;
sc = yaffs_new_search(obj);
if (!sc) {
ret_val = -ENOMEM;
goto out;
}
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_readdir: starting at %d", (int)offset);
if (offset == 0) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_readdir: entry . ino %d",
(int)inode->i_ino);
yaffs_gross_unlock(dev);
if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
yaffs_gross_lock(dev);
goto out;
}
yaffs_gross_lock(dev);
offset++;
f->f_pos++;
}
if (offset == 1) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_readdir: entry .. ino %d",
(int)f->f_dentry->d_parent->d_inode->i_ino);
yaffs_gross_unlock(dev);
if (filldir(dirent, "..", 2, offset,
f->f_dentry->d_parent->d_inode->i_ino,
DT_DIR) < 0) {
yaffs_gross_lock(dev);
goto out;
}
yaffs_gross_lock(dev);
offset++;
f->f_pos++;
}
curoffs = 1;
/* If the directory has changed since the open or last call to
readdir, rewind to after the 2 canned entries. */
if (f->f_version != inode->i_version) {
offset = 2;
f->f_pos = offset;
f->f_version = inode->i_version;
}
while (sc->next_return) {
curoffs++;
l = sc->next_return;
if (curoffs >= offset) {
int this_inode = yaffs_get_obj_inode(l);
int this_type = yaffs_get_obj_type(l);
yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_readdir: %s inode %d",
name, yaffs_get_obj_inode(l));
yaffs_gross_unlock(dev);
if (filldir(dirent,
name,
strlen(name),
offset, this_inode, this_type) < 0) {
yaffs_gross_lock(dev);
goto out;
}
yaffs_gross_lock(dev);
offset++;
f->f_pos++;
}
yaffs_search_advance(sc);
}
out:
yaffs_search_end(sc);
yaffs_dev_to_lc(dev)->readdir_process = NULL;
yaffs_gross_unlock(dev);
return ret_val;
}
static const struct file_operations yaffs_dir_operations = {
.read = generic_read_dir,
.readdir = yaffs_readdir,
.fsync = yaffs_sync_object,
.llseek = generic_file_llseek,
};
static int yaffs_file_flush(struct file *file, fl_owner_t id)
{
struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
struct yaffs_dev *dev = obj->my_dev;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_flush object %d (%s)",
obj->obj_id, obj->dirty ? "dirty" : "clean");
yaffs_gross_lock(dev);
yaffs_flush_file(obj, 1, 0);
yaffs_gross_unlock(dev);
return 0;
}
static const struct file_operations yaffs_file_operations = {
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.flush = yaffs_file_flush,
.fsync = yaffs_sync_object,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
.llseek = generic_file_llseek,
};
/* ExportFS support */
static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
uint32_t generation)
{
return yaffs_iget(sb, ino);
}
static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
struct fid *fid, int fh_len,
int fh_type)
{
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
yaffs2_nfs_get_inode);
}
static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
struct fid *fid, int fh_len,
int fh_type)
{
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
yaffs2_nfs_get_inode);
}
struct dentry *yaffs2_get_parent(struct dentry *dentry)
{
struct super_block *sb = dentry->d_inode->i_sb;
struct dentry *parent = ERR_PTR(-ENOENT);
struct inode *inode;
unsigned long parent_ino;
struct yaffs_obj *d_obj;
struct yaffs_obj *parent_obj;
d_obj = yaffs_inode_to_obj(dentry->d_inode);
if (d_obj) {
parent_obj = d_obj->parent;
if (parent_obj) {
parent_ino = yaffs_get_obj_inode(parent_obj);
inode = yaffs_iget(sb, parent_ino);
if (IS_ERR(inode)) {
parent = ERR_CAST(inode);
} else {
parent = d_obtain_alias(inode);
if (!IS_ERR(parent)) {
parent = ERR_PTR(-ENOMEM);
iput(inode);
}
}
}
}
return parent;
}
/* Just declare a zero structure as a NULL value implies
* using the default functions of exportfs.
*/
static struct export_operations yaffs_export_ops = {
.fh_to_dentry = yaffs2_fh_to_dentry,
.fh_to_parent = yaffs2_fh_to_parent,
.get_parent = yaffs2_get_parent,
};
/*-----------------------------------------------------------------*/
static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
int buflen)
{
unsigned char *alias;
int ret;
struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
yaffs_gross_lock(dev);
alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
yaffs_gross_unlock(dev);
if (!alias)
return -ENOMEM;
ret = vfs_readlink(dentry, buffer, buflen, alias);
kfree(alias);
return ret;