| /* |
| * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. |
| * |
| * Copyright (C) 2002-2010 Aleph One Ltd. |
| * for Toby Churchill Ltd and Brightstar Engineering |
| * |
| * Created by Charles Manning <charles@aleph1.co.uk> |
| * Acknowledgements: |
| * Luc van OostenRyck for numerous patches. |
| * Nick Bane for numerous patches. |
| * Nick Bane for 2.5/2.6 integration. |
| * Andras Toth for mknod rdev issue. |
| * Michael Fischer for finding the problem with inode inconsistency. |
| * Some code bodily lifted from JFFS |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* |
| * |
| * This is the file system front-end to YAFFS that hooks it up to |
| * the VFS. |
| * |
| * Special notes: |
| * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with |
| * this superblock |
| * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this |
| * superblock |
| * >> inode->u.generic_ip points to the associated struct yaffs_obj. |
| */ |
| |
| /* |
| * NB There are two variants of Linux VFS glue code. This variant supports |
| * a single version and should not include any multi-version code. |
| */ |
| #include <linux/version.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/proc_fs.h> |
| #include <linux/pagemap.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/interrupt.h> |
| #include <linux/string.h> |
| #include <linux/ctype.h> |
| #include <linux/namei.h> |
| #include <linux/exportfs.h> |
| #include <linux/kthread.h> |
| #include <linux/delay.h> |
| #include <linux/freezer.h> |
| |
| #include <asm/div64.h> |
| |
| #include <linux/statfs.h> |
| |
| #define UnlockPage(p) unlock_page(p) |
| #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) |
| |
| #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) |
| |
| #define YPROC_ROOT NULL |
| |
| #define Y_INIT_TIMER(a, b, c) setup_deferrable_timer_on_stack(a, b, c) |
| |
| #define WRITE_SIZE_STR "writesize" |
| #define WRITE_SIZE(mtd) ((mtd)->writesize) |
| |
| static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) |
| { |
| uint64_t result = partition_size; |
| do_div(result, block_size); |
| return (uint32_t) result; |
| } |
| |
| #include <linux/uaccess.h> |
| #include <linux/mtd/mtd.h> |
| |
| #include "yportenv.h" |
| #include "yaffs_trace.h" |
| #include "yaffs_guts.h" |
| #include "yaffs_attribs.h" |
| |
| #include "yaffs_linux.h" |
| |
| #include "yaffs_mtdif.h" |
| #include "yaffs_mtdif1.h" |
| #include "yaffs_mtdif2.h" |
| |
| unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS; |
| unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS; |
| unsigned int yaffs_auto_checkpoint = 1; |
| unsigned int yaffs_gc_control = 1; |
| unsigned int yaffs_bg_enable = 1; |
| |
| /* Module Parameters */ |
| module_param(yaffs_trace_mask, uint, 0644); |
| module_param(yaffs_wr_attempts, uint, 0644); |
| module_param(yaffs_auto_checkpoint, uint, 0644); |
| module_param(yaffs_gc_control, uint, 0644); |
| module_param(yaffs_bg_enable, uint, 0644); |
| |
| |
| #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private) |
| #define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr))) |
| #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode) |
| #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info) |
| |
| #define update_dir_time(dir) do {\ |
| (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \ |
| } while(0) |
| |
| |
| static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) |
| { |
| return yaffs_gc_control; |
| } |
| |
| static void yaffs_gross_lock(struct yaffs_dev *dev) |
| { |
| yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current); |
| mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); |
| yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current); |
| } |
| |
| static void yaffs_gross_unlock(struct yaffs_dev *dev) |
| { |
| yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current); |
| mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); |
| } |
| |
| static void yaffs_fill_inode_from_obj(struct inode *inode, |
| struct yaffs_obj *obj); |
| |
| static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino) |
| { |
| struct inode *inode; |
| struct yaffs_obj *obj; |
| struct yaffs_dev *dev = yaffs_super_to_dev(sb); |
| |
| yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino); |
| |
| inode = iget_locked(sb, ino); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| if (!(inode->i_state & I_NEW)) |
| return inode; |
| |
| /* NB This is called as a side effect of other functions, but |
| * we had to release the lock to prevent deadlocks, so |
| * need to lock again. |
| */ |
| |
| yaffs_gross_lock(dev); |
| |
| obj = yaffs_find_by_number(dev, inode->i_ino); |
| |
| yaffs_fill_inode_from_obj(inode, obj); |
| |
| yaffs_gross_unlock(dev); |
| |
| unlock_new_inode(inode); |
| return inode; |
| } |
| |
| struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, |
| struct yaffs_obj *obj) |
| { |
| struct inode *inode; |
| |
| if (!sb) { |
| yaffs_trace(YAFFS_TRACE_OS, |
| "yaffs_get_inode for NULL super_block!!"); |
| return NULL; |
| |
| } |
| |
| if (!obj) { |
| yaffs_trace(YAFFS_TRACE_OS, |
| "yaffs_get_inode for NULL object!!"); |
| return NULL; |
| |
| } |
| |
| yaffs_trace(YAFFS_TRACE_OS, |
| "yaffs_get_inode for object %d", |
| obj->obj_id); |
| |
| inode = yaffs_iget(sb, obj->obj_id); |
| if (IS_ERR(inode)) |
| return NULL; |
| |
| /* NB Side effect: iget calls back to yaffs_read_inode(). */ |
| /* iget also increments the inode's i_count */ |
| /* NB You can't be holding gross_lock or deadlock will happen! */ |
| |
| return inode; |
| } |
| |
| static int yaffs_mknod(struct inode *dir, struct dentry *dentry, 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, yaffs_background_waker, |
| (unsigned long)current); |
| timer.expires = expires + 1; |
| |
| set_current_state(TASK_INTERRUPTIBLE); |
| add_timer(&timer); |
| schedule(); |
| del_timer_sync(&timer); |
| } |
| |
| return 0; |
| } |
| |
| static int yaffs_bg_start(struct yaffs_dev *dev) |
| { |
| int retval = 0; |
| struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); |
| |
| if (dev->read_only) |
| return -1; |
| |
| context->bg_running = 1; |
| |
| context->bg_thread = kthread_run(yaffs_bg_thread_fn, |
| (void *)dev, "yaffs-bg-%d", |
| context->mount_id); |
| |
| if (IS_ERR(context->bg_thread)) { |
| retval = PTR_ERR(context->bg_thread); |
| context->bg_thread = NULL; |
| context->bg_running = 0; |
| } |
| return retval; |
| } |
| |
| static void yaffs_bg_stop(struct yaffs_dev *dev) |
| { |
| struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev); |
| |
| ctxt->bg_running = 0; |
| |
| if (ctxt->bg_thread) { |
| kthread_stop(ctxt->bg_thread); |
| ctxt->bg_thread = NULL; |
| } |
| } |
| |
| static void yaffs_write_super(struct super_block *sb) |
| { |
| unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2); |
| |
| yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, |
| "yaffs_write_super%s", |
| request_checkpoint ? " checkpt" : ""); |
| |
| yaffs_do_sync_fs(sb, request_checkpoint); |
| |
| } |
| |
| static int yaffs_sync_fs(struct super_block *sb, int wait) |
| { |
| unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1); |
| |
| yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, |
| "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : ""); |
| |
| yaffs_do_sync_fs(sb, request_checkpoint); |
| |
| return 0; |
| } |
| |
| |
| static LIST_HEAD(yaffs_context_list); |
| struct mutex yaffs_context_lock; |
| |
| |
| |
| struct yaffs_options { |
| int inband_tags; |
| int skip_checkpoint_read; |
| int skip_checkpoint_write; |
| int no_cache; |
| int tags_ecc_on; |
| int tags_ecc_overridden; |
| int lazy_loading_enabled; |
| int lazy_loading_overridden; |
| int empty_lost_and_found; |
| int empty_lost_and_found_overridden; |
| }; |
| |
| #define MAX_OPT_LEN 30 |
| static int yaffs_parse_options(struct yaffs_options *options, |
| const char *options_str) |
| { |
| char cur_opt[MAX_OPT_LEN + 1]; |
| int p; |
| int error = 0; |
| |
| /* Parse through the options which is a comma seperated list */ |
| |
| while (options_str && *options_str && !error) { |
| memset(cur_opt, 0, MAX_OPT_LEN + 1); |
| p = 0; |
| |
| while (*options_str == ',') |
| options_str++; |
| |
| while (*options_str && *options_str != ',') { |
| if (p < MAX_OPT_LEN) { |
| cur_opt[p] = *options_str; |
| p++; |
| } |
| options_str++; |
| } |
| |
| if (!strcmp(cur_opt, "inband-tags")) { |
| options->inband_tags = 1; |
| } else if (!strcmp(cur_opt, "tags-ecc-off")) { |
| options->tags_ecc_on = 0; |
| options->tags_ecc_overridden = 1; |
| } else if (!strcmp(cur_opt, "tags-ecc-on")) { |
| options->tags_ecc_on = 1; |
| options->tags_ecc_overridden = 1; |
| } else if (!strcmp(cur_opt, "lazy-loading-off")) { |
| options->lazy_loading_enabled = 0; |
| options->lazy_loading_overridden = 1; |
| } else if (!strcmp(cur_opt, "lazy-loading-on")) { |
| options->lazy_loading_enabled = 1; |
| options->lazy_loading_overridden = 1; |
| } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) { |
| options->empty_lost_and_found = 0; |
| options->empty_lost_and_found_overridden = 1; |
| } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) { |
| options->empty_lost_and_found = 1; |
| options->empty_lost_and_found_overridden = 1; |
| } else if (!strcmp(cur_opt, "no-cache")) { |
| options->no_cache = 1; |
| } else if (!strcmp(cur_opt, "no-checkpoint-read")) { |
| options->skip_checkpoint_read = 1; |
| } else if (!strcmp(cur_opt, "no-checkpoint-write")) { |
| options->skip_checkpoint_write = 1; |
| } else if (!strcmp(cur_opt, "no-checkpoint")) { |
| options->skip_checkpoint_read = 1; |
| options->skip_checkpoint_write = 1; |
| } else { |
| printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n", |
| cur_opt); |
| error = 1; |
| } |
| } |
| |
| return error; |
| } |
| |
| static struct address_space_operations yaffs_file_address_operations = { |
| .readpage = yaffs_readpage, |
| .writepage = yaffs_writepage, |
| .write_begin = yaffs_write_begin, |
| .write_end = yaffs_write_end, |
| }; |
| |
| |
| |
| static const struct inode_operations yaffs_file_inode_operations = { |
| .setattr = yaffs_setattr, |
| #ifdef CONFIG_YAFFS_XATTR |
| .setxattr = yaffs_setxattr, |
| .getxattr = yaffs_getxattr, |
| .listxattr = yaffs_listxattr, |
| .removexattr = yaffs_removexattr, |
| #endif |
| }; |
| |
| static const struct inode_operations yaffs_symlink_inode_operations = { |
| .readlink = yaffs_readlink, |
| .follow_link = yaffs_follow_link, |
| .put_link = yaffs_put_link, |
| .setattr = yaffs_setattr, |
| #ifdef CONFIG_YAFFS_XATTR |
| .setxattr = yaffs_setxattr, |
| .getxattr = yaffs_getxattr, |
| .listxattr = yaffs_listxattr, |
| .removexattr = yaffs_removexattr, |
| #endif |
| }; |
| |
| static void yaffs_fill_inode_from_obj(struct inode *inode, |
| struct yaffs_obj *obj) |
| { |
| if (inode && obj) { |
| |
| /* Check mode against the variant type and attempt to repair if broken. */ |
| u32 mode = obj->yst_mode; |
| switch (obj->variant_type) { |
| case YAFFS_OBJECT_TYPE_FILE: |
| if (!S_ISREG(mode)) { |
| obj->yst_mode &= ~S_IFMT; |
| obj->yst_mode |= S_IFREG; |
| } |
| |
| break; |
| case YAFFS_OBJECT_TYPE_SYMLINK: |
| if (!S_ISLNK(mode)) { |
| obj->yst_mode &= ~S_IFMT; |
| obj->yst_mode |= S_IFLNK; |
| } |
| |
| break; |
| case YAFFS_OBJECT_TYPE_DIRECTORY: |
| if (!S_ISDIR(mode)) { |
| obj->yst_mode &= ~S_IFMT; |
| obj->yst_mode |= S_IFDIR; |
| } |
| |
| break; |
| case YAFFS_OBJECT_TYPE_UNKNOWN: |
| case YAFFS_OBJECT_TYPE_HARDLINK: |
| case YAFFS_OBJECT_TYPE_SPECIAL: |
| default: |
| /* TODO? */ |
| break; |
| } |
| |
| inode->i_flags |= S_NOATIME; |
| |
| inode->i_ino = obj->obj_id; |
| inode->i_mode = obj->yst_mode; |
| inode->i_uid = obj->yst_uid; |
| inode->i_gid = obj->yst_gid; |
| |
| inode->i_rdev = old_decode_dev(obj->yst_rdev); |
| |
| inode->i_atime.tv_sec = (time_t) (obj->yst_atime); |
| inode->i_atime.tv_nsec = 0; |
| inode->i_mtime.tv_sec = (time_t) obj->yst_mtime; |
| inode->i_mtime.tv_nsec = 0; |
| inode->i_ctime.tv_sec = (time_t) obj->yst_ctime; |
| inode->i_ctime.tv_nsec = 0; |
| inode->i_size = yaffs_get_obj_length(obj); |
| inode->i_blocks = (inode->i_size + 511) >> 9; |
| |
| 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 struct dentry *yaffs_mount(struct file_system_type *fs, int flags, |
| const char *dev_name, void *data) |
| { |
| return mount_bdev(fs, flags, dev_name, data, |
| yaffs_internal_read_super_mtd); |
| } |
| |
| static struct file_system_type yaffs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "yaffs", |
| .mount = yaffs_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| #ifdef CONFIG_YAFFS_YAFFS2 |
| |
| static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data, |
| int silent) |
| { |
| return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL; |
| } |
| |
| static struct dentry *yaffs2_mount(struct file_system_type *fs, |
| int flags, const char *dev_name, void *data) |
| { |
| return mount_bdev(fs, flags, dev_name, data, |
| yaffs2_internal_read_super_mtd); |
| } |
| |
| static struct file_system_type yaffs2_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "yaffs2", |
| .mount = yaffs2_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| #endif /* CONFIG_YAFFS_YAFFS2 */ |
| |
| static struct proc_dir_entry *my_proc_entry; |
| |
| static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev) |
| { |
| struct yaffs_param *param = &dev->param; |
| buf += sprintf(buf, "start_block........... %d\n", param->start_block); |
| buf += sprintf(buf, "end_block............. %d\n", param->end_block); |
| buf += sprintf(buf, "total_bytes_per_chunk. %d\n", |
| param->total_bytes_per_chunk); |
| buf += sprintf(buf, "use_nand_ecc.......... %d\n", |
| param->use_nand_ecc); |
| buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc); |
| buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2); |
| buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags); |
| buf += sprintf(buf, "empty_lost_n_found.... %d\n", |
| param->empty_lost_n_found); |
| buf += sprintf(buf, "disable_lazy_load..... %d\n", |
| param->disable_lazy_load); |
| buf += sprintf(buf, "refresh_period........ %d\n", |
| param->refresh_period); |
| buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches); |
| buf += sprintf(buf, "n_reserved_blocks..... %d\n", |
| param->n_reserved_blocks); |
| buf += sprintf(buf, "always_check_erased... %d\n", |
| param->always_check_erased); |
| |
| return buf; |
| } |
| |
| static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev) |
| { |
| buf += |
| sprintf(buf, "data_bytes_per_chunk.. %d\n", |
| dev->data_bytes_per_chunk); |
| buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits); |
| buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size); |
| buf += |
| sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks); |
| buf += |
| sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt); |
| buf += sprintf(buf, "\n"); |
| buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes); |
| buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj); |
| buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks); |
| buf += sprintf(buf, "\n"); |
| buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes); |
| buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads); |
| buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures); |
| buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies); |
| buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs); |
| buf += |
| sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count); |
| buf += |
| sprintf(buf, "oldest_dirty_gc_count. %u\n", |
| dev->oldest_dirty_gc_count); |
| buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks); |
| buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs); |
| buf += |
| sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes); |
| buf += |
| sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks); |
| buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed); |
| buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed); |
| buf += |
| sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed); |
| buf += |
| sprintf(buf, "n_tags_ecc_unfixed.... %u\n", |
| dev->n_tags_ecc_unfixed); |
| buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits); |
| buf += |
| sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files); |
| buf += |
| sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files); |
| buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count); |
| buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions); |
| |
| return buf; |
| } |
| |
| static int yaffs_proc_read(char *page, |
| char **start, |
| off_t offset, int count, int *eof, void *data) |
| { |
| struct list_head *item; |
| char *buf = page; |
| int step = offset; |
| int n = 0; |
| |
| /* Get proc_file_read() to step 'offset' by one on each sucessive call. |
| * We use 'offset' (*ppos) to indicate where we are in dev_list. |
| * This also assumes the user has posted a read buffer large |
| * enough to hold the complete output; but that's life in /proc. |
| */ |
| |
| *(int *)start = 1; |
| |
| /* Print header first */ |
| if (step == 0) |
| buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n"); |
| else if (step == 1) |
| buf += sprintf(buf, "\n"); |
| else { |
| step -= 2; |
| |
| mutex_lock(&yaffs_context_lock); |
| |
| /* Locate and print the Nth entry. Order N-squared but N is small. */ |
| list_for_each(item, &yaffs_context_list) { |
| struct yaffs_linux_context *dc = |
| list_entry(item, struct yaffs_linux_context, |
| context_list); |
| struct yaffs_dev *dev = dc->dev; |
| |
| if (n < (step & ~1)) { |
| n += 2; |
| continue; |
| } |
| if ((step & 1) == 0) { |
| buf += |
| sprintf(buf, "\nDevice %d \"%s\"\n", n, |
| dev->param.name); |
| buf = yaffs_dump_dev_part0(buf, dev); |
| } else { |
| buf = yaffs_dump_dev_part1(buf, dev); |
| } |
| |
| break; |
| } |
| mutex_unlock(&yaffs_context_lock); |
| } |
| |
| return buf - page < count ? buf - page : count; |
| } |
| |
| |
| /** |
| * Set the verbosity of the warnings and error messages. |
| * |
| * Note that the names can only be a..z or _ with the current code. |
| */ |
| |
| static struct { |
| char *mask_name; |
| unsigned mask_bitfield; |
| } mask_flags[] = { |
| {"allocate", YAFFS_TRACE_ALLOCATE}, |
| {"always", YAFFS_TRACE_ALWAYS}, |
| {"background", YAFFS_TRACE_BACKGROUND}, |
| {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS}, |
| {"buffers", YAFFS_TRACE_BUFFERS}, |
| {"bug", YAFFS_TRACE_BUG}, |
| {"checkpt", YAFFS_TRACE_CHECKPOINT}, |
| {"deletion", YAFFS_TRACE_DELETION}, |
| {"erase", YAFFS_TRACE_ERASE}, |
| {"error", YAFFS_TRACE_ERROR}, |
| {"gc_detail", YAFFS_TRACE_GC_DETAIL}, |
| {"gc", YAFFS_TRACE_GC}, |
| {"lock", YAFFS_TRACE_LOCK}, |
| {"mtd", YAFFS_TRACE_MTD}, |
| {"nandaccess", YAFFS_TRACE_NANDACCESS}, |
| {"os", YAFFS_TRACE_OS}, |
| {"scan_debug", YAFFS_TRACE_SCAN_DEBUG}, |
| {"scan", YAFFS_TRACE_SCAN}, |
| {"mount", YAFFS_TRACE_MOUNT}, |
| {"tracing", YAFFS_TRACE_TRACING}, |
| {"sync", YAFFS_TRACE_SYNC}, |
| {"write", YAFFS_TRACE_WRITE}, |
| {"verify", YAFFS_TRACE_VERIFY}, |
| {"verify_nand", YAFFS_TRACE_VERIFY_NAND}, |
| {"verify_full", YAFFS_TRACE_VERIFY_FULL}, |
| {"verify_all", YAFFS_TRACE_VERIFY_ALL}, |
| {"all", 0xffffffff}, |
| {"none", 0}, |
| {NULL, 0}, |
| }; |
| |
| #define MAX_MASK_NAME_LENGTH 40 |
| static int yaffs_proc_write_trace_options(struct file *file, const char *buf, |
| unsigned long count, void *data) |
| { |
| unsigned rg = 0, mask_bitfield; |
| char *end; |
| char *mask_name; |
| const char *x; |
| char substring[MAX_MASK_NAME_LENGTH + 1]; |
| int i; |
| int done = 0; |
| int add, len = 0; |
| int pos = 0; |
| |
| rg = yaffs_trace_mask; |
| |
| while (!done && (pos < count)) { |
| done = 1; |
| while ((pos < count) && isspace(buf[pos])) |
| pos++; |
| |
| switch (buf[pos]) { |
| case '+': |
| case '-': |
| case '=': |
| add = buf[pos]; |
| pos++; |
| break; |
| |
| default: |
| add = ' '; |
| break; |
| } |
| mask_name = NULL; |
| |
| mask_bitfield = simple_strtoul(buf + pos, &end, 0); |
| |
| if (end > buf + pos) { |
| mask_name = "numeral"; |
| len = end - (buf + pos); |
| pos += len; |
| done = 0; |
| } else { |
| for (x = buf + pos, i = 0; |
| (*x == '_' || (*x >= 'a' && *x <= 'z')) && |
| i < MAX_MASK_NAME_LENGTH; x++, i++, pos++) |
| substring[i] = *x; |
| substring[i] = '\0'; |
| |
| for (i = 0; mask_flags[i].mask_name != NULL; i++) { |
| if (strcmp(substring, mask_flags[i].mask_name) |
| == 0) { |
| mask_name = mask_flags[i].mask_name; |
| mask_bitfield = |
| mask_flags[i].mask_bitfield; |
| done = 0; |
| break; |
| } |
| } |
| } |
| |
| if (mask_name != NULL) { |
| done = 0; |
| switch (add) { |
| case '-': |
| rg &= ~mask_bitfield; |
| break; |
| case '+': |
| rg |= mask_bitfield; |
| break; |
| case '=': |
| rg = mask_bitfield; |
| break; |
| default: |
| rg |= mask_bitfield; |
| break; |
| } |
| } |
| } |
| |
| yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS; |
| |
| printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask); |
| |
| if (rg & YAFFS_TRACE_ALWAYS) { |
| for (i = 0; mask_flags[i].mask_name != NULL; i++) { |
| char flag; |
| flag = ((rg & mask_flags[i].mask_bitfield) == |
| mask_flags[i].mask_bitfield) ? '+' : '-'; |
| printk(KERN_DEBUG "%c%s\n", flag, |
| mask_flags[i].mask_name); |
| } |
| } |
| |
| return count; |
| } |
| |
| static int yaffs_proc_write(struct file *file, const char *buf, |
| unsigned long count, void *data) |
| { |
| return yaffs_proc_write_trace_options(file, buf, count, data); |
| } |
| |
| /* Stuff to handle installation of file systems */ |
| struct file_system_to_install { |
| struct file_system_type *fst; |
| int installed; |
| }; |
| |
| static struct file_system_to_install fs_to_install[] = { |
| {&yaffs_fs_type, 0}, |
| {&yaffs2_fs_type, 0}, |
| {NULL, 0} |
| }; |
| |
| static int __init init_yaffs_fs(void) |
| { |
| int error = 0; |
| struct file_system_to_install *fsinst; |
| |
| yaffs_trace(YAFFS_TRACE_ALWAYS, |
| "yaffs built " __DATE__ " " __TIME__ " Installing."); |
| |
| #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED |
| yaffs_trace(YAFFS_TRACE_ALWAYS, |
| "\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n"); |
| #endif |
| |
| mutex_init(&yaffs_context_lock); |
| |
| /* Install the proc_fs entries */ |
| my_proc_entry = create_proc_entry("yaffs", |
| S_IRUGO | S_IFREG, YPROC_ROOT); |
| |
| if (my_proc_entry) { |
| my_proc_entry->write_proc = yaffs_proc_write; |
| my_proc_entry->read_proc = yaffs_proc_read; |
| my_proc_entry->data = NULL; |
| } else { |
| return -ENOMEM; |
| } |
| |
| |
| /* Now add the file system entries */ |
| |
| fsinst = fs_to_install; |
| |
| while (fsinst->fst && !error) { |
| error = register_filesystem(fsinst->fst); |
| if (!error) |
| fsinst->installed = 1; |
| fsinst++; |
| } |
| |
| /* Any errors? uninstall */ |
| if (error) { |
| fsinst = fs_to_install; |
| |
| while (fsinst->fst) { |
| if (fsinst->installed) { |
| unregister_filesystem(fsinst->fst); |
| fsinst->installed = 0; |
| } |
| fsinst++; |
| } |
| } |
| |
| return error; |
| } |
| |
| static void __exit exit_yaffs_fs(void) |
| { |
| |
| struct file_system_to_install *fsinst; |
| |
| yaffs_trace(YAFFS_TRACE_ALWAYS, |
| "yaffs built " __DATE__ " " __TIME__ " removing."); |
| |
| remove_proc_entry("yaffs", YPROC_ROOT); |
| |
| fsinst = fs_to_install; |
| |
| while (fsinst->fst) { |
| if (fsinst->installed) { |
| unregister_filesystem(fsinst->fst); |
| fsinst->installed = 0; |
| } |
| fsinst++; |
| } |
| } |
| |
| module_init(init_yaffs_fs) |
| module_exit(exit_yaffs_fs) |
| |
| MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); |
| MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010"); |
| MODULE_LICENSE("GPL"); |