tobi/M7350
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
2d95e8761a
M7350/kernel/fs/yaffs2/yaffs_vfs.c
T 2d95e8761a M7350v3_en_gpl
2024-09-09 08:55:19 +00:00

2803 lines
68 KiB
C
Raw Blame History

/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
* 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 <linux/cleancache.h>
#include <asm/div64.h>
#include <linux/statfs.h>
#define UnlockPage(p) unlock_page(p)
#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
#define YPROC_ROOT NULL
#define Y_INIT_TIMER(a, b, c) setup_deferrable_timer_on_stack(a, b, c)
#define WRITE_SIZE_STR "writesize"
#define WRITE_SIZE(mtd) ((mtd)->writesize)
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;
}
#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;
/* 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);
#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, umode_t 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 = -ENOSPC;
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: parent object %d type %d",
parent->obj_id, parent->variant_type);
} else {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_mknod: could not get parent object");
return -EPERM;
}
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);
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;
}
/* Can not call yaffs_get_inode() with gross lock held */
yaffs_gross_unlock(dev);
if (obj) {
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));
error = 0;
yaffs_fill_inode_from_obj(dir, parent);
} else {
yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
error = -ENOMEM;
}
return error;
}
static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
}
static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t 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;
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");
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) {
struct inode *inode;
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;
} else {
yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
}
return -ENOMEM;
}
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) {
drop_nlink(dentry->d_inode);
dir->i_version++;
yaffs_gross_unlock(dev);
mark_inode_dirty(dentry->d_inode);
update_dir_time(dir);
return 0;
}
yaffs_gross_unlock(dev);
return -ENOTEMPTY;
}
static int yaffs_sync_object(struct file *file, loff_t a, loff_t b, 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) {
/*
* We have identified target to be a
* valid directory earlier. If it is
* not the case throw a warning.
*/
WARN_ON(!new_dentry->d_inode);
if (new_dentry->d_inode) {
drop_nlink(new_dentry->d_inode);
mark_inode_dirty(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;
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 == 0)
error = inode_change_ok(inode, attr);
if (error == 0) {
int result;
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 = 0;
} else {
error = -EPERM;
}
yaffs_gross_unlock(dev);
}
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
return error;
}
#ifdef CONFIG_YAFFS_XATTR
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 = 0;
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);
if (error == 0) {
int result;
dev = obj->my_dev;
yaffs_gross_lock(dev);
result = yaffs_set_xattrib(obj, name, value, size, flags);
if (result == YAFFS_OK)
error = 0;
else if (result < 0)
error = result;
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 = 0;
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);
if (error == 0) {
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 = 0;
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);
if (error == 0) {
int result;
dev = obj->my_dev;
yaffs_gross_lock(dev);
result = yaffs_remove_xattrib(obj, name);
if (result == YAFFS_OK)
error = 0;
else if (result < 0)
error = result;
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 = 0;
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);
if (error == 0) {
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;
}
#endif
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,
#ifdef CONFIG_YAFFS_XATTR
.setxattr = yaffs_setxattr,
.getxattr = yaffs_getxattr,
.listxattr = yaffs_listxattr,
.removexattr = yaffs_removexattr,
#endif
};
/*-----------------------------------------------------------------*/
/* 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) {
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) {
if (i) {
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;
}
static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
unsigned char *alias;
void *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) {
ret = ERR_PTR(-ENOMEM);
goto out;
}
nd_set_link(nd, alias);
ret = (void *)alias;
out:
return ret;
}
void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
{
kfree(alias);
}
static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
{
/* Clear the association between the inode and
* the struct yaffs_obj.
*/
obj->my_inode = NULL;
yaffs_inode_to_obj_lv(inode) = NULL;
/* If the object freeing was deferred, then the real
* free happens now.
* This should fix the inode inconsistency problem.
*/
yaffs_handle_defered_free(obj);
}
/* yaffs_evict_inode combines into one operation what was previously done in
* yaffs_clear_inode() and yaffs_delete_inode()
*
*/
static void yaffs_evict_inode(struct inode *inode)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
int deleteme = 0;
obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_evict_inode: ino %d, count %d %s",
(int)inode->i_ino,
atomic_read(&inode->i_count),
obj ? "object exists" : "null object");
if (!inode->i_nlink && !is_bad_inode(inode))
deleteme = 1;
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
if (deleteme && obj) {
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_del_obj(obj);
yaffs_gross_unlock(dev);
}
if (obj) {
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_unstitch_obj(inode, obj);
yaffs_gross_unlock(dev);
}
}
static void yaffs_touch_super(struct yaffs_dev *dev)
{
struct super_block *sb = yaffs_dev_to_lc(dev)->super;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
if (sb)
sb->s_dirt = 1;
}
static int yaffs_readpage_nolock(struct file *f, struct page *pg)
{
/* Lifted from jffs2 */
struct yaffs_obj *obj;
unsigned char *pg_buf;
int ret;
struct yaffs_dev *dev;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_readpage_nolock at %08x, size %08x",
(unsigned)(pg->index << PAGE_CACHE_SHIFT),
(unsigned)PAGE_CACHE_SIZE);
ret = cleancache_get_page(pg);
if (!ret)
goto cleancache_got;
obj = yaffs_dentry_to_obj(f->f_dentry);
dev = obj->my_dev;
BUG_ON(!PageLocked(pg));
pg_buf = kmap(pg);
/* FIXME: Can kmap fail? */
yaffs_gross_lock(dev);
ret = yaffs_file_rd(obj, pg_buf,
pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
yaffs_gross_unlock(dev);
if (ret >= 0)
ret = 0;
cleancache_got:
if (ret) {
ClearPageUptodate(pg);
SetPageError(pg);
} else {
SetPageUptodate(pg);
SetPageMappedToDisk(pg);
ClearPageError(pg);
}
flush_dcache_page(pg);
kunmap(pg);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
return ret;
}
static int yaffs_readpage_unlock(struct file *f, struct page *pg)
{
int ret = yaffs_readpage_nolock(f, pg);
UnlockPage(pg);
return ret;
}
static int yaffs_readpage(struct file *f, struct page *pg)
{
int ret;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
ret = yaffs_readpage_unlock(f, pg);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
return ret;
}
/* writepage inspired by/stolen from smbfs */
static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
{
struct yaffs_dev *dev;
struct address_space *mapping = page->mapping;
struct inode *inode;
unsigned long end_index;
char *buffer;
struct yaffs_obj *obj;
int n_written = 0;
unsigned n_bytes;
loff_t i_size;
if (!mapping)
BUG();
inode = mapping->host;
if (!inode)
BUG();
i_size = i_size_read(inode);
end_index = i_size >> PAGE_CACHE_SHIFT;
if (page->index < end_index)
n_bytes = PAGE_CACHE_SIZE;
else {
n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
if (page->index > end_index || !n_bytes) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_writepage at %08x, inode size = %08x!!!",
(unsigned)(page->index << PAGE_CACHE_SHIFT),
(unsigned)inode->i_size);
yaffs_trace(YAFFS_TRACE_OS,
" -> don't care!!");
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
set_page_writeback(page);
unlock_page(page);
end_page_writeback(page);
return 0;
}
}
if (n_bytes != PAGE_CACHE_SIZE)
zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
get_page(page);
buffer = kmap(page);
obj = yaffs_inode_to_obj(inode);
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_writepage at %08x, size %08x",
(unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
yaffs_trace(YAFFS_TRACE_OS,
"writepag0: obj = %05x, ino = %05x",
(int)obj->variant.file_variant.file_size, (int)inode->i_size);
n_written = yaffs_wr_file(obj, buffer,
page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
yaffs_touch_super(dev);
yaffs_trace(YAFFS_TRACE_OS,
"writepag1: obj = %05x, ino = %05x",
(int)obj->variant.file_variant.file_size, (int)inode->i_size);
yaffs_gross_unlock(dev);
kunmap(page);
set_page_writeback(page);
unlock_page(page);
end_page_writeback(page);
put_page(page);
return (n_written == n_bytes) ? 0 : -ENOSPC;
}
/* Space holding and freeing is done to ensure we have space available for
* write_begin/end.
* For now we just assume few parallel writes and check against a small
* number.
* Todo: need to do this with a counter to handle parallel reads better.
*/
static ssize_t yaffs_hold_space(struct file *f)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
int n_free_chunks;
obj = yaffs_dentry_to_obj(f->f_dentry);
dev = obj->my_dev;
yaffs_gross_lock(dev);
n_free_chunks = yaffs_get_n_free_chunks(dev);
yaffs_gross_unlock(dev);
return (n_free_chunks > 20) ? 1 : 0;
}
static void yaffs_release_space(struct file *f)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
obj = yaffs_dentry_to_obj(f->f_dentry);
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_gross_unlock(dev);
}
static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
struct page *pg = NULL;
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
int ret = 0;
int space_held = 0;
/* Get a page */
pg = grab_cache_page_write_begin(mapping, index, flags);
*pagep = pg;
if (!pg) {
ret = -ENOMEM;
goto out;
}
yaffs_trace(YAFFS_TRACE_OS,
"start yaffs_write_begin index %d(%x) uptodate %d",
(int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
/* Get fs space */
space_held = yaffs_hold_space(filp);
if (!space_held) {
ret = -ENOSPC;
goto out;
}
/* Update page if required */
if (!Page_Uptodate(pg))
ret = yaffs_readpage_nolock(filp, pg);
if (ret)
goto out;
/* Happy path return */
yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
return 0;
out:
yaffs_trace(YAFFS_TRACE_OS,
"end yaffs_write_begin fail returning %d", ret);
if (space_held)
yaffs_release_space(filp);
if (pg) {
unlock_page(pg);
page_cache_release(pg);
}
return ret;
}
static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
loff_t * pos)
{
struct yaffs_obj *obj;
int n_written, ipos;
struct inode *inode;
struct yaffs_dev *dev;
obj = yaffs_dentry_to_obj(f->f_dentry);
dev = obj->my_dev;
yaffs_gross_lock(dev);
inode = f->f_dentry->d_inode;
if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
ipos = inode->i_size;
else
ipos = *pos;
if (!obj)
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write: hey obj is null!");
else
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
(unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
yaffs_touch_super(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write: %d(%x) bytes written",
(unsigned)n, (unsigned)n);
if (n_written > 0) {
ipos += n_written;
*pos = ipos;
if (ipos > inode->i_size) {
inode->i_size = ipos;
inode->i_blocks = (ipos + 511) >> 9;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write size updated to %d bytes, %d blocks",
ipos, (int)(inode->i_blocks));
}
}
yaffs_gross_unlock(dev);
return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
}
static int yaffs_write_end(struct file *filp, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *pg, void *fsdadata)
{
int ret = 0;
void *addr, *kva;
uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
kva = kmap(pg);
addr = kva + offset_into_page;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_write_end addr %p pos %x n_bytes %d",
addr, (unsigned)pos, copied);
ret = yaffs_file_write(filp, addr, copied, &pos);
if (ret != copied) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_write_end not same size ret %d copied %d",
ret, copied);
SetPageError(pg);
}
kunmap(pg);
yaffs_release_space(filp);
unlock_page(pg);
page_cache_release(pg);
return ret;
}
static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
struct super_block *sb = dentry->d_sb;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
yaffs_gross_lock(dev);
buf->f_type = YAFFS_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_namelen = 255;
if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
/* Do this if chunk size is not a power of 2 */
uint64_t bytes_in_dev;
uint64_t bytes_free;
bytes_in_dev =
((uint64_t)
((dev->param.end_block - dev->param.start_block +
1))) * ((uint64_t) (dev->param.chunks_per_block *
dev->data_bytes_per_chunk));
do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
buf->f_blocks = bytes_in_dev;
bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
((uint64_t) (dev->data_bytes_per_chunk));
do_div(bytes_free, sb->s_blocksize);
buf->f_bfree = bytes_free;
} else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
buf->f_blocks =
(dev->param.end_block - dev->param.start_block + 1) *
dev->param.chunks_per_block /
(sb->s_blocksize / dev->data_bytes_per_chunk);
buf->f_bfree =
yaffs_get_n_free_chunks(dev) /
(sb->s_blocksize / dev->data_bytes_per_chunk);
} else {
buf->f_blocks =
(dev->param.end_block - dev->param.start_block + 1) *
dev->param.chunks_per_block *
(dev->data_bytes_per_chunk / sb->s_blocksize);
buf->f_bfree =
yaffs_get_n_free_chunks(dev) *
(dev->data_bytes_per_chunk / sb->s_blocksize);
}
buf->f_files = 0;
buf->f_ffree = 0;
buf->f_bavail = buf->f_bfree;
yaffs_gross_unlock(dev);
return 0;
}
static void yaffs_flush_inodes(struct super_block *sb)
{
struct inode *iptr;
struct yaffs_obj *obj;
list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
obj = yaffs_inode_to_obj(iptr);
if (obj) {
yaffs_trace(YAFFS_TRACE_OS,
"flushing obj %d", obj->obj_id);
yaffs_flush_file(obj, 1, 0);
}
}
}
static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
{
struct yaffs_dev *dev = yaffs_super_to_dev(sb);
if (!dev)
return;
yaffs_flush_inodes(sb);
yaffs_update_dirty_dirs(dev);
yaffs_flush_whole_cache(dev);
if (do_checkpoint)
yaffs_checkpoint_save(dev);
}
static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
{
unsigned erased_chunks =
dev->n_erased_blocks * dev->param.chunks_per_block;
struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
unsigned scattered = 0; /* Free chunks not in an erased block */
if (erased_chunks < dev->n_free_chunks)
scattered = (dev->n_free_chunks - erased_chunks);
if (!context->bg_running)
return 0;
else if (scattered < (dev->param.chunks_per_block * 2))
return 0;
else if (erased_chunks > dev->n_free_chunks / 2)
return 0;
else if (erased_chunks > dev->n_free_chunks / 4)
return 1;
else
return 2;
}
static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
{
struct yaffs_dev *dev = yaffs_super_to_dev(sb);
unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
int do_checkpoint;
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
"yaffs_do_sync_fs: gc-urgency %d %s %s%s",
gc_urgent,
sb->s_dirt ? "dirty" : "clean",
request_checkpoint ? "checkpoint requested" : "no checkpoint",
oneshot_checkpoint ? " one-shot" : "");
yaffs_gross_lock(dev);
do_checkpoint = ((request_checkpoint && !gc_urgent) ||
oneshot_checkpoint) && !dev->is_checkpointed;
if (sb->s_dirt || do_checkpoint) {
yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
sb->s_dirt = 0;
if (oneshot_checkpoint)
yaffs_auto_checkpoint &= ~4;
}
yaffs_gross_unlock(dev);
return 0;
}
/*
* yaffs background thread functions .
* yaffs_bg_thread_fn() the thread function
* yaffs_bg_start() launches the background thread.
* yaffs_bg_stop() cleans up the background thread.
*
* NB:
* The thread should only run after the yaffs is initialised
* The thread should be stopped before yaffs is unmounted.
* The thread should not do any writing while the fs is in read only.
*/
void yaffs_background_waker(unsigned long data)
{
wake_up_process((struct task_struct *)data);
}
static int yaffs_bg_thread_fn(void *data)
{
struct yaffs_dev *dev = (struct yaffs_dev *)data;
struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
unsigned long now = jiffies;
unsigned long next_dir_update = now;
unsigned long next_gc = now;
unsigned long expires;
unsigned int urgency;
int gc_result;
struct timer_list timer;
yaffs_trace(YAFFS_TRACE_BACKGROUND,
"yaffs_background starting for dev %p", (void *)dev);
set_freezable();
while (context->bg_running) {
yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
if (kthread_should_stop())
break;
if (try_to_freeze())
continue;
yaffs_gross_lock(dev);
now = jiffies;
if (time_after(now, next_dir_update) && yaffs_bg_enable) {
yaffs_update_dirty_dirs(dev);
next_dir_update = now + HZ;
}
if (time_after(now, next_gc) && yaffs_bg_enable) {
if (!dev->is_checkpointed) {
urgency = yaffs_bg_gc_urgency(dev);
gc_result = yaffs_bg_gc(dev, urgency);
if (urgency > 1)
next_gc = now + HZ / 20 + 1;
else if (urgency > 0)
next_gc = now + HZ / 10 + 1;
else
next_gc = now + HZ * 2;
} else {
/*
* gc not running so set to next_dir_update
* to cut down on wake ups
*/
next_gc = next_dir_update;
}
}
yaffs_gross_unlock(dev);
expires = next_dir_update;
if (time_before(next_gc, expires))
expires = next_gc;
if (time_before(expires, now))
expires = now + HZ;
Y_INIT_TIMER(&timer, yaffs_background_waker,
(unsigned long)current);
timer.expires = expires + 1;
set_current_state(TASK_INTERRUPTIBLE);
add_timer(&timer);
schedule();
del_timer_sync(&timer);
}
return 0;
}
static int yaffs_bg_start(struct yaffs_dev *dev)
{
int retval = 0;
struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
if (dev->read_only)
return -1;
context->bg_running = 1;
context->bg_thread = kthread_run(yaffs_bg_thread_fn,
(void *)dev, "yaffs-bg-%d",
context->mount_id);
if (IS_ERR(context->bg_thread)) {
retval = PTR_ERR(context->bg_thread);
context->bg_thread = NULL;
context->bg_running = 0;
}
return retval;
}
static void yaffs_bg_stop(struct yaffs_dev *dev)
{
struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
ctxt->bg_running = 0;
if (ctxt->bg_thread) {
kthread_stop(ctxt->bg_thread);
ctxt->bg_thread = NULL;
}
}
static void yaffs_write_super(struct super_block *sb)
{
unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
"yaffs_write_super%s",
request_checkpoint ? " checkpt" : "");
yaffs_do_sync_fs(sb, request_checkpoint);
}
static int yaffs_sync_fs(struct super_block *sb, int wait)
{
unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
"yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
yaffs_do_sync_fs(sb, request_checkpoint);
return 0;
}
static LIST_HEAD(yaffs_context_list);
struct mutex yaffs_context_lock;
struct yaffs_options {
int inband_tags;
int skip_checkpoint_read;
int skip_checkpoint_write;
int no_cache;
int tags_ecc_on;
int tags_ecc_overridden;
int lazy_loading_enabled;
int lazy_loading_overridden;
int empty_lost_and_found;
int empty_lost_and_found_overridden;
};
#define MAX_OPT_LEN 30
static int yaffs_parse_options(struct yaffs_options *options,
const char *options_str)
{
char cur_opt[MAX_OPT_LEN + 1];
int p;
int error = 0;
/* Parse through the options which is a comma seperated list */
while (options_str && *options_str && !error) {
memset(cur_opt, 0, MAX_OPT_LEN + 1);
p = 0;
while (*options_str == ',')
options_str++;
while (*options_str && *options_str != ',') {
if (p < MAX_OPT_LEN) {
cur_opt[p] = *options_str;
p++;
}
options_str++;
}
if (!strcmp(cur_opt, "inband-tags")) {
options->inband_tags = 1;
} else if (!strcmp(cur_opt, "tags-ecc-off")) {
options->tags_ecc_on = 0;
options->tags_ecc_overridden = 1;
} else if (!strcmp(cur_opt, "tags-ecc-on")) {
options->tags_ecc_on = 1;
options->tags_ecc_overridden = 1;
} else if (!strcmp(cur_opt, "lazy-loading-off")) {
options->lazy_loading_enabled = 0;
options->lazy_loading_overridden = 1;
} else if (!strcmp(cur_opt, "lazy-loading-on")) {
options->lazy_loading_enabled = 1;
options->lazy_loading_overridden = 1;
} else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
options->empty_lost_and_found = 0;
options->empty_lost_and_found_overridden = 1;
} else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
options->empty_lost_and_found = 1;
options->empty_lost_and_found_overridden = 1;
} else if (!strcmp(cur_opt, "no-cache")) {
options->no_cache = 1;
} else if (!strcmp(cur_opt, "no-checkpoint-read")) {
options->skip_checkpoint_read = 1;
} else if (!strcmp(cur_opt, "no-checkpoint-write")) {
options->skip_checkpoint_write = 1;
} else if (!strcmp(cur_opt, "no-checkpoint")) {
options->skip_checkpoint_read = 1;
options->skip_checkpoint_write = 1;
} else {
printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
cur_opt);
error = 1;
}
}
return error;
}
static struct address_space_operations yaffs_file_address_operations = {
.readpage = yaffs_readpage,
.writepage = yaffs_writepage,
.write_begin = yaffs_write_begin,
.write_end = yaffs_write_end,
};
static const struct inode_operations yaffs_file_inode_operations = {
.setattr = yaffs_setattr,
#ifdef CONFIG_YAFFS_XATTR
.setxattr = yaffs_setxattr,
.getxattr = yaffs_getxattr,
.listxattr = yaffs_listxattr,
.removexattr = yaffs_removexattr,
#endif
};
static const struct inode_operations yaffs_symlink_inode_operations = {
.readlink = yaffs_readlink,
.follow_link = yaffs_follow_link,
.put_link = yaffs_put_link,
.setattr = yaffs_setattr,
#ifdef CONFIG_YAFFS_XATTR
.setxattr = yaffs_setxattr,
.getxattr = yaffs_getxattr,
.listxattr = yaffs_listxattr,
.removexattr = yaffs_removexattr,
#endif
};
static void yaffs_fill_inode_from_obj(struct inode *inode,
struct yaffs_obj *obj)
{
if (inode && obj) {
/* Check mode against the variant type and attempt to repair if broken. */
u32 mode = obj->yst_mode;
switch (obj->variant_type) {
case YAFFS_OBJECT_TYPE_FILE:
if (!S_ISREG(mode)) {
obj->yst_mode &= ~S_IFMT;
obj->yst_mode |= S_IFREG;
}
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
if (!S_ISLNK(mode)) {
obj->yst_mode &= ~S_IFMT;
obj->yst_mode |= S_IFLNK;
}
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
if (!S_ISDIR(mode)) {
obj->yst_mode &= ~S_IFMT;
obj->yst_mode |= S_IFDIR;
}
break;
case YAFFS_OBJECT_TYPE_UNKNOWN:
case YAFFS_OBJECT_TYPE_HARDLINK:
case YAFFS_OBJECT_TYPE_SPECIAL:
default:
/* TODO? */
break;
}
inode->i_flags |= S_NOATIME;
inode->i_ino = obj->obj_id;
inode->i_mode = obj->yst_mode;
inode->i_uid = obj->yst_uid;
inode->i_gid = obj->yst_gid;
inode->i_rdev = old_decode_dev(obj->yst_rdev);
inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
inode->i_atime.tv_nsec = 0;
inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
inode->i_mtime.tv_nsec = 0;
inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
inode->i_ctime.tv_nsec = 0;
inode->i_size = yaffs_get_obj_length(obj);
inode->i_blocks = (inode->i_size + 511) >> 9;
set_nlink(inode, yaffs_get_obj_link_count(obj));
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
inode->i_mode, inode->i_uid, inode->i_gid,
(int)inode->i_size, atomic_read(&inode->i_count));
switch (obj->yst_mode & S_IFMT) {
default: /* fifo, device or socket */
init_special_inode(inode, obj->yst_mode,
old_decode_dev(obj->yst_rdev));
break;
case S_IFREG: /* file */
inode->i_op = &yaffs_file_inode_operations;
inode->i_fop = &yaffs_file_operations;
inode->i_mapping->a_ops =
&yaffs_file_address_operations;
break;
case S_IFDIR: /* directory */
inode->i_op = &yaffs_dir_inode_operations;
inode->i_fop = &yaffs_dir_operations;
break;
case S_IFLNK: /* symlink */
inode->i_op = &yaffs_symlink_inode_operations;
break;
}
yaffs_inode_to_obj_lv(inode) = obj;
obj->my_inode = inode;
} else {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_fill_inode invalid parameters");
}
}
static void yaffs_put_super(struct super_block *sb)
{
struct yaffs_dev *dev = yaffs_super_to_dev(sb);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
"Shutting down yaffs background thread");
yaffs_bg_stop(dev);
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
"yaffs background thread shut down");
yaffs_gross_lock(dev);
yaffs_flush_super(sb, 1);
if (yaffs_dev_to_lc(dev)->put_super_fn)
yaffs_dev_to_lc(dev)->put_super_fn(sb);
yaffs_deinitialise(dev);
yaffs_gross_unlock(dev);
mutex_lock(&yaffs_context_lock);
list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
mutex_unlock(&yaffs_context_lock);
if (yaffs_dev_to_lc(dev)->spare_buffer) {
kfree(yaffs_dev_to_lc(dev)->spare_buffer);
yaffs_dev_to_lc(dev)->spare_buffer = NULL;
}
kfree(dev);
}
static void yaffs_mtd_put_super(struct super_block *sb)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
mtd_sync(mtd);
put_mtd_device(mtd);
}
static const struct super_operations yaffs_super_ops = {
.statfs = yaffs_statfs,
.put_super = yaffs_put_super,
.evict_inode = yaffs_evict_inode,
.sync_fs = yaffs_sync_fs,
.write_super = yaffs_write_super,
};
static struct super_block *yaffs_internal_read_super(int yaffs_version,
struct super_block *sb,
void *data, int silent)
{
int n_blocks;
struct inode *inode = NULL;
struct dentry *root;
struct yaffs_dev *dev = 0;
char devname_buf[BDEVNAME_SIZE + 1];
struct mtd_info *mtd;
int err;
char *data_str = (char *)data;
struct yaffs_linux_context *context = NULL;
struct yaffs_param *param;
int read_only = 0;
struct yaffs_options options;
unsigned mount_id;
int found;
struct yaffs_linux_context *context_iterator;
struct list_head *l;
sb->s_magic = YAFFS_MAGIC;
sb->s_op = &yaffs_super_ops;
sb->s_flags |= MS_NOATIME;
read_only = ((sb->s_flags & MS_RDONLY) != 0);
sb->s_export_op = &yaffs_export_ops;
if (!sb)
printk(KERN_INFO "yaffs: sb is NULL\n");
else if (!sb->s_dev)
printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
else if (!yaffs_devname(sb, devname_buf))
printk(KERN_INFO "yaffs: devname is NULL\n");
else
printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
sb->s_dev,
yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
if (!data_str)
data_str = "";
printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
memset(&options, 0, sizeof(options));
if (yaffs_parse_options(&options, data_str)) {
/* Option parsing failed */
return NULL;
}
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_read_super: Using yaffs%d", yaffs_version);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_read_super: block size %d", (int)(sb->s_blocksize));
yaffs_trace(YAFFS_TRACE_ALWAYS,
"Attempting MTD mount of %u.%u,\"%s\"",
MAJOR(sb->s_dev), MINOR(sb->s_dev),
yaffs_devname(sb, devname_buf));
/* Check it's an mtd device..... */
if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
return NULL; /* This isn't an mtd device */
/* Get the device */
mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
if (!mtd) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device #%u doesn't appear to exist",
MINOR(sb->s_dev));
return NULL;
}
/* Check it's NAND */
if (mtd->type != MTD_NANDFLASH) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device is not NAND it's type %d",
mtd->type);
return NULL;
}
yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->_erase);
yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->_read);
yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->_write);
yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->_read_oob);
yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->_write_oob);
yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->_block_isbad);
yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->_block_markbad);
yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
#ifdef CONFIG_YAFFS_AUTO_YAFFS2
if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
yaffs_version = 2;
}
/* Added NCB 26/5/2006 for completeness */
if (yaffs_version == 2 && !options.inband_tags
&& WRITE_SIZE(mtd) == 512) {
yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
yaffs_version = 1;
}
#endif
if (yaffs_version == 2) {
/* Check for version 2 style functions */
if (!mtd->_erase ||
!mtd->_block_isbad ||
!mtd->_block_markbad ||
!mtd->_read ||
!mtd->_write || !mtd->_read_oob || !mtd->_write_oob) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device does not support required functions");
return NULL;
}
if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
!options.inband_tags) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device does not have the right page sizes");
return NULL;
}
} else {
/* Check for V1 style functions */
if (!mtd->_erase ||
!mtd->_read ||
!mtd->_write || !mtd->_read_oob || !mtd->_write_oob) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device does not support required functions");
return NULL;
}
if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
yaffs_trace(YAFFS_TRACE_ALWAYS,
"MTD device does not support have the right page sizes");
return NULL;
}
}
/* OK, so if we got here, we have an MTD that's NAND and looks
* like it has the right capabilities
* Set the struct yaffs_dev up for mtd
*/
if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
read_only = 1;
printk(KERN_INFO
"yaffs: mtd is read only, setting superblock read only");
sb->s_flags |= MS_RDONLY;
}
dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
if (!dev || !context) {
if (dev)
kfree(dev);
if (context)
kfree(context);
dev = NULL;
context = NULL;
}
if (!dev) {
/* Deep shit could not allocate device structure */
yaffs_trace(YAFFS_TRACE_ALWAYS,
"yaffs_read_super failed trying to allocate yaffs_dev");
return NULL;
}
memset(dev, 0, sizeof(struct yaffs_dev));
param = &(dev->param);
memset(context, 0, sizeof(struct yaffs_linux_context));
dev->os_context = context;
INIT_LIST_HEAD(&(context->context_list));
context->dev = dev;
context->super = sb;
dev->read_only = read_only;
sb->s_fs_info = dev;
dev->driver_context = mtd;
param->name = mtd->name;
/* Set up the memory size parameters.... */
n_blocks =
YCALCBLOCKS(mtd->size,
(YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
param->start_block = 0;
param->end_block = n_blocks - 1;
param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
param->n_reserved_blocks = 5;
param->n_caches = (options.no_cache) ? 0 : 10;
param->inband_tags = options.inband_tags;
#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
param->disable_lazy_load = 1;
#endif
#ifdef CONFIG_YAFFS_XATTR
param->enable_xattr = 1;
#endif
if (options.lazy_loading_overridden)
param->disable_lazy_load = !options.lazy_loading_enabled;
#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
param->no_tags_ecc = 1;
#endif
#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
#else
param->defered_dir_update = 1;
#endif
if (options.tags_ecc_overridden)
param->no_tags_ecc = !options.tags_ecc_on;
#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
param->empty_lost_n_found = 1;
#endif
#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
param->refresh_period = 0;
#else
param->refresh_period = 500;
#endif
#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
param->always_check_erased = 1;
#endif
if (options.empty_lost_and_found_overridden)
param->empty_lost_n_found = options.empty_lost_and_found;
/* ... and the functions. */
if (yaffs_version == 2) {
param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
param->bad_block_fn = nandmtd2_mark_block_bad;
param->query_block_fn = nandmtd2_query_block;
yaffs_dev_to_lc(dev)->spare_buffer =
kmalloc(mtd->oobsize, GFP_NOFS);
param->is_yaffs2 = 1;
param->total_bytes_per_chunk = mtd->writesize;
param->chunks_per_block = mtd->erasesize / mtd->writesize;
n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
param->start_block = 0;
param->end_block = n_blocks - 1;
} else {
/* use the MTD interface in yaffs_mtdif1.c */
param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
param->bad_block_fn = nandmtd1_mark_block_bad;
param->query_block_fn = nandmtd1_query_block;
param->is_yaffs2 = 0;
}
/* ... and common functions */
param->erase_fn = nandmtd_erase_block;
param->initialise_flash_fn = nandmtd_initialise;
yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
param->sb_dirty_fn = yaffs_touch_super;
param->gc_control = yaffs_gc_control_callback;
yaffs_dev_to_lc(dev)->super = sb;
#ifndef CONFIG_YAFFS_DOES_ECC
param->use_nand_ecc = 1;
#endif
param->skip_checkpt_rd = options.skip_checkpoint_read;
param->skip_checkpt_wr = options.skip_checkpoint_write;
mutex_lock(&yaffs_context_lock);
/* Get a mount id */
found = 0;
for (mount_id = 0; !found; mount_id++) {
found = 1;
list_for_each(l, &yaffs_context_list) {
context_iterator =
list_entry(l, struct yaffs_linux_context,
context_list);
if (context_iterator->mount_id == mount_id)
found = 0;
}
}
context->mount_id = mount_id;
list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
&yaffs_context_list);
mutex_unlock(&yaffs_context_lock);
/* Directory search handling... */
INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
param->remove_obj_fn = yaffs_remove_obj_callback;
mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
yaffs_gross_lock(dev);
err = yaffs_guts_initialise(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_read_super: guts initialised %s",
(err == YAFFS_OK) ? "OK" : "FAILED");
if (err == YAFFS_OK)
yaffs_bg_start(dev);
if (!context->bg_thread)
param->defered_dir_update = 0;
/* Release lock before yaffs_get_inode() */
yaffs_gross_unlock(dev);
/* Create root inode */
if (err == YAFFS_OK)
inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
if (!inode)
return NULL;
inode->i_op = &yaffs_dir_inode_operations;
inode->i_fop = &yaffs_dir_operations;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
root = d_make_root(inode);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_make_root done");
if (!root) {
iput(inode);
return NULL;
}
sb->s_root = root;
sb->s_dirt = !dev->is_checkpointed;
yaffs_trace(YAFFS_TRACE_ALWAYS,
"yaffs_read_super: is_checkpointed %d",
dev->is_checkpointed);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
cleancache_init_fs(sb);
return sb;
}
static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
int silent)
{
return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
}
static struct dentry *yaffs_mount(struct file_system_type *fs, int flags,
const char *dev_name, void *data)
{
return mount_bdev(fs, flags, dev_name, data,
yaffs_internal_read_super_mtd);
}
static struct file_system_type yaffs_fs_type = {
.owner = THIS_MODULE,
.name = "yaffs",
.mount = yaffs_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
#ifdef CONFIG_YAFFS_YAFFS2
static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
int silent)
{
return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
}
static struct dentry *yaffs2_mount(struct file_system_type *fs,
int flags, const char *dev_name, void *data)
{
return mount_bdev(fs, flags, dev_name, data,
yaffs2_internal_read_super_mtd);
}
static struct file_system_type yaffs2_fs_type = {
.owner = THIS_MODULE,
.name = "yaffs2",
.mount = yaffs2_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
#endif /* CONFIG_YAFFS_YAFFS2 */
static struct proc_dir_entry *my_proc_entry;
static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
{
struct yaffs_param *param = &dev->param;
buf += sprintf(buf, "start_block........... %d\n", param->start_block);
buf += sprintf(buf, "end_block............. %d\n", param->end_block);
buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
param->total_bytes_per_chunk);
buf += sprintf(buf, "use_nand_ecc.......... %d\n",
param->use_nand_ecc);
buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
buf += sprintf(buf, "empty_lost_n_found.... %d\n",
param->empty_lost_n_found);
buf += sprintf(buf, "disable_lazy_load..... %d\n",
param->disable_lazy_load);
buf += sprintf(buf, "refresh_period........ %d\n",
param->refresh_period);
buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
buf += sprintf(buf, "n_reserved_blocks..... %d\n",
param->n_reserved_blocks);
buf += sprintf(buf, "always_check_erased... %d\n",
param->always_check_erased);
return buf;
}
static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
{
buf +=
sprintf(buf, "data_bytes_per_chunk.. %d\n",
dev->data_bytes_per_chunk);
buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
buf +=
sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
buf +=
sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
buf += sprintf(buf, "\n");
buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
buf += sprintf(buf, "\n");
buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
buf +=
sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
buf +=
sprintf(buf, "oldest_dirty_gc_count. %u\n",
dev->oldest_dirty_gc_count);
buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
buf +=
sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
buf +=
sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
buf +=
sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
buf +=
sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
dev->n_tags_ecc_unfixed);
buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
buf +=
sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
buf +=
sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
return buf;
}
static int yaffs_proc_read(char *page,
char **start,
off_t offset, int count, int *eof, void *data)
{
struct list_head *item;
char *buf = page;
int step = offset;
int n = 0;
/* Get proc_file_read() to step 'offset' by one on each sucessive call.
* We use 'offset' (*ppos) to indicate where we are in dev_list.
* This also assumes the user has posted a read buffer large
* enough to hold the complete output; but that's life in /proc.
*/
*(int *)start = 1;
/* Print header first */
if (step == 0)
buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
else if (step == 1)
buf += sprintf(buf, "\n");
else {
step -= 2;
mutex_lock(&yaffs_context_lock);
/* Locate and print the Nth entry. Order N-squared but N is small. */
list_for_each(item, &yaffs_context_list) {
struct yaffs_linux_context *dc =
list_entry(item, struct yaffs_linux_context,
context_list);
struct yaffs_dev *dev = dc->dev;
if (n < (step & ~1)) {
n += 2;
continue;
}
if ((step & 1) == 0) {
buf +=
sprintf(buf, "\nDevice %d \"%s\"\n", n,
dev->param.name);
buf = yaffs_dump_dev_part0(buf, dev);
} else {
buf = yaffs_dump_dev_part1(buf, dev);
}
break;
}
mutex_unlock(&yaffs_context_lock);
}
return buf - page < count ? buf - page : count;
}
/**
* Set the verbosity of the warnings and error messages.
*
* Note that the names can only be a..z or _ with the current code.
*/
static struct {
char *mask_name;
unsigned mask_bitfield;
} mask_flags[] = {
{"allocate", YAFFS_TRACE_ALLOCATE},
{"always", YAFFS_TRACE_ALWAYS},
{"background", YAFFS_TRACE_BACKGROUND},
{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
{"buffers", YAFFS_TRACE_BUFFERS},
{"bug", YAFFS_TRACE_BUG},
{"checkpt", YAFFS_TRACE_CHECKPOINT},
{"deletion", YAFFS_TRACE_DELETION},
{"erase", YAFFS_TRACE_ERASE},
{"error", YAFFS_TRACE_ERROR},
{"gc_detail", YAFFS_TRACE_GC_DETAIL},
{"gc", YAFFS_TRACE_GC},
{"lock", YAFFS_TRACE_LOCK},
{"mtd", YAFFS_TRACE_MTD},
{"nandaccess", YAFFS_TRACE_NANDACCESS},
{"os", YAFFS_TRACE_OS},
{"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
{"scan", YAFFS_TRACE_SCAN},
{"mount", YAFFS_TRACE_MOUNT},
{"tracing", YAFFS_TRACE_TRACING},
{"sync", YAFFS_TRACE_SYNC},
{"write", YAFFS_TRACE_WRITE},
{"verify", YAFFS_TRACE_VERIFY},
{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
{"verify_full", YAFFS_TRACE_VERIFY_FULL},
{"verify_all", YAFFS_TRACE_VERIFY_ALL},
{"all", 0xffffffff},
{"none", 0},
{NULL, 0},
};
#define MAX_MASK_NAME_LENGTH 40
static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
unsigned long count, void *data)
{
unsigned rg = 0, mask_bitfield;
char *end;
char *mask_name;
const char *x;
char substring[MAX_MASK_NAME_LENGTH + 1];
int i;
int done = 0;
int add, len = 0;
int pos = 0;
rg = yaffs_trace_mask;
while (!done && (pos < count)) {
done = 1;
while ((pos < count) && isspace(buf[pos]))
pos++;
switch (buf[pos]) {
case '+':
case '-':
case '=':
add = buf[pos];
pos++;
break;
default:
add = ' ';
break;
}
mask_name = NULL;
mask_bitfield = simple_strtoul(buf + pos, &end, 0);
if (end > buf + pos) {
mask_name = "numeral";
len = end - (buf + pos);
pos += len;
done = 0;
} else {
for (x = buf + pos, i = 0;
(*x == '_' || (*x >= 'a' && *x <= 'z')) &&
i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
substring[i] = *x;
substring[i] = '\0';
for (i = 0; mask_flags[i].mask_name != NULL; i++) {
if (strcmp(substring, mask_flags[i].mask_name)
== 0) {
mask_name = mask_flags[i].mask_name;
mask_bitfield =
mask_flags[i].mask_bitfield;
done = 0;
break;
}
}
}
if (mask_name != NULL) {
done = 0;
switch (add) {
case '-':
rg &= ~mask_bitfield;
break;
case '+':
rg |= mask_bitfield;
break;
case '=':
rg = mask_bitfield;
break;
default:
rg |= mask_bitfield;
break;
}
}
}
yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
if (rg & YAFFS_TRACE_ALWAYS) {
for (i = 0; mask_flags[i].mask_name != NULL; i++) {
char flag;
flag = ((rg & mask_flags[i].mask_bitfield) ==
mask_flags[i].mask_bitfield) ? '+' : '-';
printk(KERN_DEBUG "%c%s\n", flag,
mask_flags[i].mask_name);
}
}
return count;
}
static int yaffs_proc_write(struct file *file, const char *buf,
unsigned long count, void *data)
{
return yaffs_proc_write_trace_options(file, buf, count, data);
}
/* Stuff to handle installation of file systems */
struct file_system_to_install {
struct file_system_type *fst;
int installed;
};
static struct file_system_to_install fs_to_install[] = {
{&yaffs_fs_type, 0},
{&yaffs2_fs_type, 0},
{NULL, 0}
};
static int __init init_yaffs_fs(void)
{
int error = 0;
struct file_system_to_install *fsinst;
yaffs_trace(YAFFS_TRACE_ALWAYS,
"yaffs built " __DATE__ " " __TIME__ " Installing.");
#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
yaffs_trace(YAFFS_TRACE_ALWAYS,
"\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n");
#endif
mutex_init(&yaffs_context_lock);
/* Install the proc_fs entries */
my_proc_entry = create_proc_entry("yaffs",
S_IRUGO | S_IFREG, YPROC_ROOT);
if (my_proc_entry) {
my_proc_entry->write_proc = yaffs_proc_write;
my_proc_entry->read_proc = yaffs_proc_read;
my_proc_entry->data = NULL;
} else {
return -ENOMEM;
}
/* Now add the file system entries */
fsinst = fs_to_install;
while (fsinst->fst && !error) {
error = register_filesystem(fsinst->fst);
if (!error)
fsinst->installed = 1;
fsinst++;
}
/* Any errors? uninstall */
if (error) {
fsinst = fs_to_install;
while (fsinst->fst) {
if (fsinst->installed) {
unregister_filesystem(fsinst->fst);
fsinst->installed = 0;
}
fsinst++;
}
}
return error;
}
static void __exit exit_yaffs_fs(void)
{
struct file_system_to_install *fsinst;
yaffs_trace(YAFFS_TRACE_ALWAYS,
"yaffs built " __DATE__ " " __TIME__ " removing.");
remove_proc_entry("yaffs", YPROC_ROOT);
fsinst = fs_to_install;
while (fsinst->fst) {
if (fsinst->installed) {
unregister_filesystem(fsinst->fst);
fsinst->installed = 0;
}
fsinst++;
}
}
module_init(init_yaffs_fs)
module_exit(exit_yaffs_fs)
MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink