/* * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. * * Copyright (C) 2002-2011 Aleph One Ltd. * for Toby Churchill Ltd and Brightstar Engineering * * Created by Charles Manning * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "yportenv.h" #include "yaffs_trace.h" #include "yaffs_guts.h" #include "yaffs_attribs.h" #include "yaffs_linux.h" #include "yaffs_mtdif.h" #include "yaffs_mtdif1.h" #include "yaffs_mtdif2.h" unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS; unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS; unsigned int yaffs_auto_checkpoint = 1; unsigned int yaffs_gc_control = 1; unsigned int yaffs_bg_enable = 1; unsigned int yaffs_auto_select = 1; /* Module Parameters */ module_param(yaffs_trace_mask, uint, 0644); module_param(yaffs_wr_attempts, uint, 0644); module_param(yaffs_auto_checkpoint, uint, 0644); module_param(yaffs_gc_control, uint, 0644); module_param(yaffs_bg_enable, uint, 0644); module_param(yaffs_auto_select, uint, 0644); #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) { uint64_t result = partition_size; do_div(result, block_size); return (uint32_t) result; } #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private) #define yaffs_inode_to_obj(iptr)\ ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr))) #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode) #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info) #define update_dir_time(dir) do {\ (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \ } while (0) static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) { return yaffs_gc_control; } static void yaffs_gross_lock(struct yaffs_dev *dev) { yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current); mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current); } static void yaffs_gross_unlock(struct yaffs_dev *dev) { yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current); mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); } static void yaffs_fill_inode_from_obj(struct inode *inode, struct yaffs_obj *obj); static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino) { struct inode *inode; struct yaffs_obj *obj; struct yaffs_dev *dev = yaffs_super_to_dev(sb); yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino); inode = iget_locked(sb, ino); if (!inode) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; /* NB This is called as a side effect of other functions, but * we had to release the lock to prevent deadlocks, so * need to lock again. */ yaffs_gross_lock(dev); obj = yaffs_find_by_number(dev, inode->i_ino); yaffs_fill_inode_from_obj(inode, obj); yaffs_gross_unlock(dev); unlock_new_inode(inode); return inode; } struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, struct yaffs_obj *obj) { struct inode *inode; if (!sb) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_get_inode for NULL super_block!!"); return NULL; } if (!obj) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_get_inode for NULL object!!"); return NULL; } yaffs_trace(YAFFS_TRACE_OS, "yaffs_get_inode for object %d", obj->obj_id); inode = yaffs_iget(sb, obj->obj_id); if (IS_ERR(inode)) return NULL; /* NB Side effect: iget calls back to yaffs_read_inode(). */ /* iget also increments the inode's i_count */ /* NB You can't be holding gross_lock or deadlock will happen! */ return inode; } static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) { struct inode *inode; struct yaffs_obj *obj = NULL; struct yaffs_dev *dev; struct yaffs_obj *parent = yaffs_inode_to_obj(dir); int error; uid_t uid = current->cred->fsuid; gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid; if ((dir->i_mode & S_ISGID) && S_ISDIR(mode)) mode |= S_ISGID; if (!parent) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: could not get parent object"); return -EPERM; } yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: parent object %d type %d", parent->obj_id, parent->variant_type); yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making oject for %s, mode %x dev %x", dentry->d_name.name, mode, rdev); dev = parent->my_dev; yaffs_gross_lock(dev); if (yaffs_get_n_free_chunks(dev) < 1) { error = -ENOSPC; goto err_out; } switch (mode & S_IFMT) { default: /* Special (socket, fifo, device...) */ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special"); obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid, gid, old_encode_dev(rdev)); break; case S_IFREG: /* file */ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file"); obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid, gid); break; case S_IFDIR: /* directory */ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory"); obj = yaffs_create_dir(parent, dentry->d_name.name, mode, uid, gid); break; case S_IFLNK: /* symlink */ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink"); obj = NULL; /* Do we ever get here? */ break; } if (!obj) { error = -ENOMEM; goto err_out; } /* Can not call yaffs_get_inode() with gross lock held */ yaffs_gross_unlock(dev); inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); d_instantiate(dentry, inode); update_dir_time(dir); yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod created object %d count = %d", obj->obj_id, atomic_read(&inode->i_count)); yaffs_fill_inode_from_obj(dir, parent); return 0; err_out: yaffs_gross_unlock(dev); yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod error %d", error); return error; } static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); } static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n) { return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); } static int yaffs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { struct inode *inode = old_dentry->d_inode; struct yaffs_obj *obj = NULL; struct yaffs_obj *link = NULL; struct yaffs_dev *dev; yaffs_trace(YAFFS_TRACE_OS, "yaffs_link"); obj = yaffs_inode_to_obj(inode); dev = obj->my_dev; yaffs_gross_lock(dev); if (!S_ISDIR(inode->i_mode)) /* Don't link directories */ link = yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name, obj); if (link) { 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; struct inode *inode; uid_t uid = current->cred->fsuid; gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid; yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink"); dev = yaffs_inode_to_obj(dir)->my_dev; yaffs_gross_lock(dev); obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name, S_IFLNK | S_IRWXUGO, uid, gid, symname); yaffs_gross_unlock(dev); if (!obj) { yaffs_trace(YAFFS_TRACE_OS, "symlink not created"); return -ENOMEM; } inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); d_instantiate(dentry, inode); update_dir_time(dir); yaffs_trace(YAFFS_TRACE_OS, "symlink created OK"); return 0; } static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n) { struct yaffs_obj *obj; struct inode *inode = NULL; struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev; if (current != yaffs_dev_to_lc(dev)->readdir_process) yaffs_gross_lock(dev); yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s", yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name); obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name); obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */ /* Can't hold gross lock when calling yaffs_get_inode() */ if (current != yaffs_dev_to_lc(dev)->readdir_process) yaffs_gross_unlock(dev); if (obj) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup found %d", obj->obj_id); inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); if (inode) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry"); d_add(dentry, inode); /* return dentry; */ return NULL; } } else { yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found"); } d_add(dentry, inode); return NULL; } static int yaffs_unlink(struct inode *dir, struct dentry *dentry) { int ret_val; struct yaffs_dev *dev; struct yaffs_obj *obj; yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s", (int)(dir->i_ino), dentry->d_name.name); obj = yaffs_inode_to_obj(dir); dev = obj->my_dev; yaffs_gross_lock(dev); ret_val = yaffs_unlinker(obj, dentry->d_name.name); if (ret_val == YAFFS_OK) { 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; int result; yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr of object %d", yaffs_inode_to_obj(inode)->obj_id); /* Fail if a requested resize >= 2GB */ if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) error = -EINVAL; if (!error) error = inode_change_ok(inode, attr); if (!error) { setattr_copy(inode, attr); yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called"); if (attr->ia_valid & ATTR_SIZE) { truncate_setsize(inode, attr->ia_size); inode->i_blocks = (inode->i_size + 511) >> 9; } dev = yaffs_inode_to_obj(inode)->my_dev; if (attr->ia_valid & ATTR_SIZE) { yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)", (int)(attr->ia_size), (int)(attr->ia_size)); } yaffs_gross_lock(dev); result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr); if (result != YAFFS_OK) error = -EPERM; yaffs_gross_unlock(dev); } yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error); return error; } static int yaffs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { struct inode *inode = dentry->d_inode; int error; struct yaffs_dev *dev; struct yaffs_obj *obj = yaffs_inode_to_obj(inode); yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id); dev = obj->my_dev; yaffs_gross_lock(dev); error = yaffs_set_xattrib(obj, name, value, size, flags); yaffs_gross_unlock(dev); yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error); return error; } static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff, size_t size) { struct inode *inode = dentry->d_inode; int error; struct yaffs_dev *dev; struct yaffs_obj *obj = yaffs_inode_to_obj(inode); yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr \"%s\" from object %d", name, obj->obj_id); dev = obj->my_dev; yaffs_gross_lock(dev); error = yaffs_get_xattrib(obj, name, buff, size); yaffs_gross_unlock(dev); yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error); return error; } static int yaffs_removexattr(struct dentry *dentry, const char *name) { struct inode *inode = dentry->d_inode; int error; struct yaffs_dev *dev; struct yaffs_obj *obj = yaffs_inode_to_obj(inode); yaffs_trace(YAFFS_TRACE_OS, "yaffs_removexattr of object %d", obj->obj_id); dev = obj->my_dev; yaffs_gross_lock(dev); error = yaffs_remove_xattrib(obj, name); yaffs_gross_unlock(dev); yaffs_trace(YAFFS_TRACE_OS, "yaffs_removexattr done returning %d", error); return error; } static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size) { struct inode *inode = dentry->d_inode; int error; struct yaffs_dev *dev; struct yaffs_obj *obj = yaffs_inode_to_obj(inode); yaffs_trace(YAFFS_TRACE_OS, "yaffs_listxattr of object %d", obj->obj_id); dev = obj->my_dev; yaffs_gross_lock(dev); error = yaffs_list_xattrib(obj, buff, size); yaffs_gross_unlock(dev); yaffs_trace(YAFFS_TRACE_OS, "yaffs_listxattr done returning %d", error); return error; } static const struct inode_operations yaffs_dir_inode_operations = { .create = yaffs_create, .lookup = yaffs_lookup, .link = yaffs_link, .unlink = yaffs_unlink, .symlink = yaffs_symlink, .mkdir = yaffs_mkdir, .rmdir = yaffs_unlink, .mknod = yaffs_mknod, .rename = yaffs_rename, .setattr = yaffs_setattr, .setxattr = yaffs_setxattr, .getxattr = yaffs_getxattr, .listxattr = yaffs_listxattr, .removexattr = yaffs_removexattr, }; /*-----------------------------------------------------------------*/ /* Directory search context allows us to unlock access to yaffs during * filldir without causing problems with the directory being modified. * This is similar to the tried and tested mechanism used in yaffs direct. * * A search context iterates along a doubly linked list of siblings in the * directory. If the iterating object is deleted then this would corrupt * the list iteration, likely causing a crash. The search context avoids * this by using the remove_obj_fn to move the search context to the * next object before the object is deleted. * * Many readdirs (and thus seach conexts) may be alive simulateously so * each struct yaffs_dev has a list of these. * * A seach context lives for the duration of a readdir. * * All these functions must be called while yaffs is locked. */ struct yaffs_search_context { struct yaffs_dev *dev; struct yaffs_obj *dir_obj; struct yaffs_obj *next_return; struct list_head others; }; /* * yaffs_new_search() creates a new search context, initialises it and * adds it to the device's search context list. * * Called at start of readdir. */ static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir) { struct yaffs_dev *dev = dir->my_dev; struct yaffs_search_context *sc = kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS); if (!sc) return NULL; sc->dir_obj = dir; sc->dev = dev; if (list_empty(&sc->dir_obj->variant.dir_variant.children)) sc->next_return = NULL; else sc->next_return = list_entry(dir->variant.dir_variant.children.next, struct yaffs_obj, siblings); INIT_LIST_HEAD(&sc->others); list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts)); return sc; } /* * yaffs_search_end() disposes of a search context and cleans up. */ static void yaffs_search_end(struct yaffs_search_context *sc) { if (sc) { list_del(&sc->others); kfree(sc); } } /* * yaffs_search_advance() moves a search context to the next object. * Called when the search iterates or when an object removal causes * the search context to be moved to the next object. */ static void yaffs_search_advance(struct yaffs_search_context *sc) { if (!sc) return; if (sc->next_return == NULL || list_empty(&sc->dir_obj->variant.dir_variant.children)) sc->next_return = NULL; else { struct list_head *next = sc->next_return->siblings.next; if (next == &sc->dir_obj->variant.dir_variant.children) sc->next_return = NULL; /* end of list */ else sc->next_return = list_entry(next, struct yaffs_obj, siblings); } } /* * yaffs_remove_obj_callback() is called when an object is unlinked. * We check open search contexts and advance any which are currently * on the object being iterated. */ static void yaffs_remove_obj_callback(struct yaffs_obj *obj) { struct list_head *i; struct yaffs_search_context *sc; struct list_head *search_contexts = &(yaffs_dev_to_lc(obj->my_dev)->search_contexts); /* Iterate through the directory search contexts. * If any are currently on the object being removed, then advance * the search context to the next object to prevent a hanging pointer. */ list_for_each(i, search_contexts) { sc = list_entry(i, struct yaffs_search_context, others); if (sc->next_return == obj) yaffs_search_advance(sc); } } static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) { struct yaffs_obj *obj; struct yaffs_dev *dev; struct yaffs_search_context *sc; struct inode *inode = f->f_dentry->d_inode; unsigned long offset, curoffs; struct yaffs_obj *l; int ret_val = 0; char name[YAFFS_MAX_NAME_LENGTH + 1]; obj = yaffs_dentry_to_obj(f->f_dentry); dev = obj->my_dev; yaffs_gross_lock(dev); yaffs_dev_to_lc(dev)->readdir_process = current; offset = f->f_pos; sc = yaffs_new_search(obj); if (!sc) { ret_val = -ENOMEM; goto out; } yaffs_trace(YAFFS_TRACE_OS, "yaffs_readdir: starting at %d", (int)offset); if (offset == 0) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_readdir: entry . ino %d", (int)inode->i_ino); yaffs_gross_unlock(dev); if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) { yaffs_gross_lock(dev); goto out; } yaffs_gross_lock(dev); offset++; f->f_pos++; } if (offset == 1) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_readdir: entry .. ino %d", (int)f->f_dentry->d_parent->d_inode->i_ino); yaffs_gross_unlock(dev); if (filldir(dirent, "..", 2, offset, f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) { yaffs_gross_lock(dev); goto out; } yaffs_gross_lock(dev); offset++; f->f_pos++; } curoffs = 1; /* If the directory has changed since the open or last call to readdir, rewind to after the 2 canned entries. */ if (f->f_version != inode->i_version) { offset = 2; f->f_pos = offset; f->f_version = inode->i_version; } while (sc->next_return) { curoffs++; l = sc->next_return; if (curoffs >= offset) { int this_inode = yaffs_get_obj_inode(l); int this_type = yaffs_get_obj_type(l); yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1); yaffs_trace(YAFFS_TRACE_OS, "yaffs_readdir: %s inode %d", name, yaffs_get_obj_inode(l)); yaffs_gross_unlock(dev); if (filldir(dirent, name, strlen(name), offset, this_inode, this_type) < 0) { yaffs_gross_lock(dev); goto out; } yaffs_gross_lock(dev); offset++; f->f_pos++; } yaffs_search_advance(sc); } out: yaffs_search_end(sc); yaffs_dev_to_lc(dev)->readdir_process = NULL; yaffs_gross_unlock(dev); return ret_val; } static const struct file_operations yaffs_dir_operations = { .read = generic_read_dir, .readdir = yaffs_readdir, .fsync = yaffs_sync_object, .llseek = generic_file_llseek, }; static int yaffs_file_flush(struct file *file, fl_owner_t id) { struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry); struct yaffs_dev *dev = obj->my_dev; yaffs_trace(YAFFS_TRACE_OS, "yaffs_file_flush object %d (%s)", obj->obj_id, obj->dirty ? "dirty" : "clean"); yaffs_gross_lock(dev); yaffs_flush_file(obj, 1, 0); yaffs_gross_unlock(dev); return 0; } static const struct file_operations yaffs_file_operations = { .read = do_sync_read, .write = do_sync_write, .aio_read = generic_file_aio_read, .aio_write = generic_file_aio_write, .mmap = generic_file_mmap, .flush = yaffs_file_flush, .fsync = yaffs_sync_object, .splice_read = generic_file_splice_read, .splice_write = generic_file_splice_write, .llseek = generic_file_llseek, }; /* ExportFS support */ static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation) { return yaffs_iget(sb, ino); } static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode); } static struct dentry *yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode); } struct dentry *yaffs2_get_parent(struct dentry *dentry) { struct super_block *sb = dentry->d_inode->i_sb; struct dentry *parent = ERR_PTR(-ENOENT); struct inode *inode; unsigned long parent_ino; struct yaffs_obj *d_obj; struct yaffs_obj *parent_obj; d_obj = yaffs_inode_to_obj(dentry->d_inode); if (d_obj) { parent_obj = d_obj->parent; if (parent_obj) { parent_ino = yaffs_get_obj_inode(parent_obj); inode = yaffs_iget(sb, parent_ino); if (IS_ERR(inode)) { parent = ERR_CAST(inode); } else { parent = d_obtain_alias(inode); if (!IS_ERR(parent)) { parent = ERR_PTR(-ENOMEM); iput(inode); } } } } return parent; } /* Just declare a zero structure as a NULL value implies * using the default functions of exportfs. */ static struct export_operations yaffs_export_ops = { .fh_to_dentry = yaffs2_fh_to_dentry, .fh_to_parent = yaffs2_fh_to_parent, .get_parent = yaffs2_get_parent, }; /*-----------------------------------------------------------------*/ static int yaffs_readlink(struct dentry *dentry, char __user * buffer, int buflen) { unsigned char *alias; int ret; struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; yaffs_gross_lock(dev); alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); yaffs_gross_unlock(dev); if (!alias) return -ENOMEM; ret = vfs_readlink(dentry, buffer, buflen, alias); kfree(alias); return ret; } 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); unlock_page(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, PageUptodate(pg) ? 1 : 0); /* Get fs space */ space_held = yaffs_hold_space(filp); if (!space_held) { ret = -ENOSPC; goto out; } /* Update page if required */ if (!PageUptodate(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); if (!obj) { /* This should not happen */ yaffs_trace(YAFFS_TRACE_OS, "yaffs_file_write: hey obj is null!"); return -EINVAL; } 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; 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; init_timer_on_stack(&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 const 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, .setxattr = yaffs_setxattr, .getxattr = yaffs_getxattr, .listxattr = yaffs_listxattr, .removexattr = yaffs_removexattr, }; 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, .setxattr = yaffs_setxattr, .getxattr = yaffs_getxattr, .listxattr = yaffs_listxattr, .removexattr = yaffs_removexattr, }; static void yaffs_fill_inode_from_obj(struct inode *inode, struct yaffs_obj *obj) { u32 mode; if (!inode || !obj) { yaffs_trace(YAFFS_TRACE_OS, "yaffs_fill_inode invalid parameters"); return; } /* Check mode against the variant type * and attempt to repair if broken. */ 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; } 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; if (!sb) { printk(KERN_INFO "yaffs: sb is NULL\n"); return NULL; } 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->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, " writesize %d", mtd->writesize); 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); if (yaffs_auto_select && yaffs_version == 1 && mtd->writesize >= 2048) { yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2"); yaffs_version = 2; } if (yaffs_auto_select && yaffs_version == 2 && !options.inband_tags && mtd->writesize == 512) { yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1"); yaffs_version = 1; } 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 ((mtd->writesize < 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 (mtd->writesize < 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) { kfree(dev); 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; param->disable_lazy_load = 1; param->enable_xattr = 1; if (options.lazy_loading_overridden) param->disable_lazy_load = !options.lazy_loading_enabled; param->defered_dir_update = 1; if (options.tags_ecc_overridden) param->no_tags_ecc = !options.tags_ecc_on; param->empty_lost_n_found = 1; param->refresh_period = 500; 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; param->use_nand_ecc = 1; 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 */ for (mount_id = 0, found = 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, }; 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, }; 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_retried_writes...... %u\n", dev->n_retried_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; } /* 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."); mutex_init(&yaffs_context_lock); /* Install the proc_fs entries */ my_proc_entry = create_proc_entry("yaffs", S_IRUGO | S_IFREG, NULL); if (my_proc_entry) { my_proc_entry->write_proc = NULL; 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", NULL); 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., 2002-2011"); MODULE_LICENSE("GPL");