diff options
Diffstat (limited to 'fs/yaffs2/yaffs_vfs.c')
| -rw-r--r-- | fs/yaffs2/yaffs_vfs.c | 2792 |
1 files changed, 0 insertions, 2792 deletions
diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c deleted file mode 100644 index d5b8753..0000000 --- a/fs/yaffs2/yaffs_vfs.c +++ /dev/null @@ -1,2792 +0,0 @@ -/* - * 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/smp_lock.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> - -#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) init_timer_on_stack(a) - -#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, 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 = -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, 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) { - old_dentry->d_inode->i_nlink = 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) { - dentry->d_inode->i_nlink--; - 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, 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) { - new_dentry->d_inode->i_nlink--; - 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); - - 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; - - if (ret) { - ClearPageUptodate(pg); - SetPageError(pg); - } else { - SetPageUptodate(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); - timer.expires = expires + 1; - timer.data = (unsigned long)current; - timer.function = yaffs_background_waker; - - 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; - - inode->i_nlink = 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)); - - if (mtd->sync) - 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_alloc_root(inode); - - yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_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"); - 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 int yaffs_read_super(struct file_system_type *fs, - int flags, const char *dev_name, - void *data, struct vfsmount *mnt) -{ - - return get_sb_bdev(fs, flags, dev_name, data, - yaffs_internal_read_super_mtd, mnt); -} - -static struct file_system_type yaffs_fs_type = { - .owner = THIS_MODULE, - .name = "yaffs", - .get_sb = yaffs_read_super, - .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 int yaffs2_read_super(struct file_system_type *fs, - int flags, const char *dev_name, void *data, - struct vfsmount *mnt) -{ - return get_sb_bdev(fs, flags, dev_name, data, - yaffs2_internal_read_super_mtd, mnt); -} - -static struct file_system_type yaffs2_fs_type = { - .owner = THIS_MODULE, - .name = "yaffs2", - .get_sb = yaffs2_read_super, - .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"); |