X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_vfs_single.c;h=32734a68ee21dfeefda42cd86d5056d7fc8cc848;hp=89c03fd4418e224fc7c861dc735ff25258f07780;hb=6500cebaa2c93512d544719956af259ca13f83b7;hpb=3788df745cd72e035c0c991157cb727a8ecb1f17 diff --git a/yaffs_vfs_single.c b/yaffs_vfs_single.c index 89c03fd..32734a6 100644 --- a/yaffs_vfs_single.c +++ b/yaffs_vfs_single.c @@ -36,7 +36,6 @@ * a single version and should not include any multi-version code. */ #include - #include #include #include @@ -54,30 +53,8 @@ #include #include #include - #include - #include - -#define UnlockPage(p) unlock_page(p) -#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) - -#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) - -#define YPROC_ROOT NULL - -#define Y_INIT_TIMER(a) init_timer_on_stack(a) - -#define WRITE_SIZE_STR "writesize" -#define WRITE_SIZE(mtd) ((mtd)->writesize) - -static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) -{ - uint64_t result = partition_size; - do_div(result, block_size); - return (uint32_t) result; -} - #include #include @@ -85,9 +62,7 @@ static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) #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" @@ -105,450 +80,283 @@ module_param(yaffs_auto_checkpoint, uint, 0644); module_param(yaffs_gc_control, uint, 0644); module_param(yaffs_bg_enable, uint, 0644); -#define Y_IGET(sb, inum) yaffs_iget((sb), (inum)) +#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; -static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino); + 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_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) + } while (0) -static void yaffs_put_super(struct super_block *sb); -static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, - loff_t * pos); -static ssize_t yaffs_hold_space(struct file *f); -static void yaffs_release_space(struct file *f); +static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) +{ + return yaffs_gc_control; +} -static int yaffs_file_flush(struct file *file, fl_owner_t id); +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 int yaffs_sync_object(struct file *file, int datasync); +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 int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir); +static void yaffs_fill_inode_from_obj(struct inode *inode, + struct yaffs_obj *obj); -static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, - struct nameidata *n); -static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, - struct nameidata *n); -static int yaffs_link(struct dentry *old_dentry, struct inode *dir, - struct dentry *dentry); -static int yaffs_unlink(struct inode *dir, struct dentry *dentry); -static int yaffs_symlink(struct inode *dir, struct dentry *dentry, - const char *symname); -static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode); +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); -static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, - dev_t dev); -static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry); -static int yaffs_setattr(struct dentry *dentry, struct iattr *attr); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino); -static int yaffs_sync_fs(struct super_block *sb, int wait); -static void yaffs_write_super(struct super_block *sb); + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; -static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf); + /* 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. + */ -#ifdef YAFFS_HAS_PUT_INODE -static void yaffs_put_inode(struct inode *inode); -#endif + yaffs_gross_lock(dev); -static void yaffs_evict_inode(struct inode *); + obj = yaffs_find_by_number(dev, inode->i_ino); + yaffs_fill_inode_from_obj(inode, obj); -static int yaffs_readpage(struct file *file, struct page *page); -static int yaffs_writepage(struct page *page, struct writeback_control *wbc); + yaffs_gross_unlock(dev); -#ifdef CONFIG_YAFFS_XATTR -static int yaffs_setxattr(struct dentry *dentry, const char *name, - const void *value, size_t size, int flags); -static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff, - size_t size); -static int yaffs_removexattr(struct dentry *dentry, const char *name); -static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size); -#endif + unlock_new_inode(inode); + return inode; +} -static int yaffs_write_begin(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); -static int yaffs_write_end(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *pg, void *fsdadata); +struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, + struct yaffs_obj *obj) +{ + struct inode *inode; -static int yaffs_readlink(struct dentry *dentry, char __user * buffer, - int buflen); -void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias); -static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); + if (!sb) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_get_inode for NULL super_block!!"); + return NULL; -static void yaffs_touch_super(struct yaffs_dev *dev); + } -static int yaffs_vfs_setattr(struct inode *, struct iattr *); + if (!obj) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_get_inode for NULL object!!"); + return NULL; -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 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, -}; + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_get_inode for object %d", + obj->obj_id); -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 -}; + inode = yaffs_iget(sb, obj->obj_id); + if (IS_ERR(inode)) + return NULL; -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 -}; + /* 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! */ -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 -}; + return inode; +} -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_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; -static const struct super_operations yaffs_super_ops = { - .statfs = yaffs_statfs, -#ifdef YAFFS_HAS_PUT_INODE - .put_inode = yaffs_put_inode, -#endif - .put_super = yaffs_put_super, - .evict_inode = yaffs_evict_inode, - .sync_fs = yaffs_sync_fs, - .write_super = yaffs_write_super, -}; + if ((dir->i_mode & S_ISGID) && S_ISDIR(mode)) + mode |= S_ISGID; -static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr) -{ - setattr_copy(inode, attr); - return 0; -} + if (!parent) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod: could not get parent object"); + return -EPERM; + } -static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize) -{ - truncate_setsize(inode, newsize); - return 0; -} + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod: parent object %d type %d", + parent->obj_id, parent->variant_type); -static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) -{ - return yaffs_gc_control; -} + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_mknod: making oject for %s, mode %x dev %x", + dentry->d_name.name, mode, rdev); -static void yaffs_gross_lock(struct yaffs_dev *dev) -{ - T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current)); - mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); - T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current)); -} + dev = parent->my_dev; -static void yaffs_gross_unlock(struct yaffs_dev *dev) -{ - T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current)); - mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); -} + yaffs_gross_lock(dev); -/* ExportFS support */ -static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, - uint32_t generation) -{ - return Y_IGET(sb, ino); + 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) { + yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object"); + return -ENOMEM; + } + + 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; } -static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb, - struct fid *fid, int fh_len, - int fh_type) +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { - return generic_fh_to_dentry(sb, fid, fh_len, fh_type, - yaffs2_nfs_get_inode); + return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); } -static struct dentry *yaffs2_fh_to_parent(struct super_block *sb, - struct fid *fid, int fh_len, - int fh_type) +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *n) { - return generic_fh_to_parent(sb, fid, fh_len, fh_type, - yaffs2_nfs_get_inode); + return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); } -struct dentry *yaffs2_get_parent(struct dentry *dentry) +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; - 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 = Y_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, -}; - -/*-----------------------------------------------------------------*/ -/* 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 = - YMALLOC(sizeof(struct yaffs_search_context)); - 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_trace(YAFFS_TRACE_OS, "yaffs_link"); -/* - * 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); - YFREE(sc); - } -} + obj = yaffs_inode_to_obj(inode); + dev = obj->my_dev; -/* - * 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; + yaffs_gross_lock(dev); - 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 (!S_ISDIR(inode->i_mode)) /* Don't link directories */ + link = + yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name, + obj); - 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); + 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_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); + yaffs_gross_unlock(dev); - /* 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); - } + if (link) { + update_dir_time(dir); + return 0; } + return -EPERM; } -/*-----------------------------------------------------------------*/ - -static int yaffs_readlink(struct dentry *dentry, char __user * buffer, - int buflen) +static int yaffs_symlink(struct inode *dir, struct dentry *dentry, + const char *symname) { - unsigned char *alias; - int ret; + 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; - struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; + yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink"); + dev = yaffs_inode_to_obj(dir)->my_dev; yaffs_gross_lock(dev); - - alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); - + 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 (!alias) + if (!obj) { + yaffs_trace(YAFFS_TRACE_OS, "symlink not created"); 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; -} + 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"); -void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) -{ - kfree(alias); + return 0; } -struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, - struct yaffs_obj *obj); - -/* - * Lookup is used to find objects in the fs - */ - static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n) { struct yaffs_obj *obj; - struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */ - + 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); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_lookup for %d:%s\n"), - yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name)); + 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); @@ -559,20 +367,20 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, yaffs_gross_unlock(dev); if (obj) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_lookup found %d\n"), obj->obj_id)); + 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) { - T(YAFFS_TRACE_OS, (TSTR("yaffs_loookup dentry \n"))); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry"); d_add(dentry, inode); /* return dentry; */ return NULL; } } else { - T(YAFFS_TRACE_OS, (TSTR("yaffs_lookup not found\n"))); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found"); } @@ -581,1089 +389,1030 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, return NULL; } -#ifdef YAFFS_HAS_PUT_INODE - -/* For now put inode is just for debugging - * Put inode is called when the inode **structure** is put. - */ -static void yaffs_put_inode(struct inode *inode) +static int yaffs_unlink(struct inode *dir, struct dentry *dentry) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino, - atomic_read(&inode->i_count))); + int ret_val; + struct yaffs_dev *dev; + struct yaffs_obj *obj; -} -#endif + 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; -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; + yaffs_gross_lock(dev); - /* If the object freeing was deferred, then the real - * free happens now. - * This should fix the inode inconsistency problem. - */ - yaffs_handle_defered_free(obj); + 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; } -/* 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) +static int yaffs_sync_object(struct file *file, int datasync) { + struct yaffs_obj *obj; struct yaffs_dev *dev; - int deleteme = 0; - - obj = yaffs_inode_to_obj(inode); + struct dentry *dentry = file->f_path.dentry; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino, - atomic_read(&inode->i_count), - obj ? "object exists" : "null object")); + obj = yaffs_dentry_to_obj(dentry); - 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 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; - - T(YAFFS_TRACE_OS, - (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id, - obj->dirty ? "dirty" : "clean")); + dev = obj->my_dev; + yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object"); yaffs_gross_lock(dev); - - yaffs_flush_file(obj, 1, 0); - + yaffs_flush_file(obj, 1, datasync); yaffs_gross_unlock(dev); - return 0; } - -static int yaffs_readpage_nolock(struct file *f, struct page *pg) +/* + * 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) { - /* Lifted from jffs2 */ - - struct yaffs_obj *obj; - unsigned char *pg_buf; - int ret; - struct yaffs_dev *dev; + int ret_val = YAFFS_FAIL; + struct yaffs_obj *target; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"), - (unsigned)(pg->index << PAGE_CACHE_SHIFT), - (unsigned)PAGE_CACHE_SIZE)); - - obj = yaffs_dentry_to_obj(f->f_dentry); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename"); + dev = yaffs_inode_to_obj(old_dir)->my_dev; - dev = obj->my_dev; + yaffs_gross_lock(dev); - BUG_ON(!PageLocked(pg)); + /* 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); - pg_buf = kmap(pg); - /* FIXME: Can kmap fail? */ + if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY && + !list_empty(&target->variant.dir_variant.children)) { - yaffs_gross_lock(dev); + yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir"); - ret = yaffs_file_rd(obj, pg_buf, - pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); + 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 >= 0) - ret = 0; + if (ret_val == YAFFS_OK) { + if (target) { + new_dentry->d_inode->i_nlink--; + mark_inode_dirty(new_dentry->d_inode); + } - if (ret) { - ClearPageUptodate(pg); - SetPageError(pg); + update_dir_time(old_dir); + if (old_dir != new_dir) + update_dir_time(new_dir); + return 0; } else { - SetPageUptodate(pg); - ClearPageError(pg); + return -ENOTEMPTY; } - - flush_dcache_page(pg); - kunmap(pg); - - T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n"))); - 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; - - T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n"))); - ret = yaffs_readpage_unlock(f, pg); - T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n"))); - return ret; } -/* writepage inspired by/stolen from smbfs */ - -static int yaffs_writepage(struct page *page, struct writeback_control *wbc) +static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) { + struct inode *inode = dentry->d_inode; + int error = 0; 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); + int result; - end_index = i_size >> PAGE_CACHE_SHIFT; + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_setattr of object %d", + yaffs_inode_to_obj(inode)->obj_id); - if (page->index < end_index) - n_bytes = PAGE_CACHE_SIZE; - else { - n_bytes = i_size & (PAGE_CACHE_SIZE - 1); + /* Fail if a requested resize >= 2GB */ + if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) + error = -EINVAL; - if (page->index > end_index || !n_bytes) { - T(YAFFS_TRACE_OS, - (TSTR - ("yaffs_writepage at %08x, inode size = %08x!!!\n"), - (unsigned)(page->index << PAGE_CACHE_SHIFT), - (unsigned)inode->i_size)); - T(YAFFS_TRACE_OS, - (TSTR(" -> don't care!!\n"))); + if (!error) + error = inode_change_ok(inode, attr); - zero_user_segment(page, 0, PAGE_CACHE_SIZE); - set_page_writeback(page); - unlock_page(page); - end_page_writeback(page); - return 0; + 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); } - if (n_bytes != PAGE_CACHE_SIZE) - zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error); - get_page(page); + return error; +} - buffer = kmap(page); +#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; + 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); - obj = yaffs_inode_to_obj(inode); dev = obj->my_dev; yaffs_gross_lock(dev); - - T(YAFFS_TRACE_OS, - (TSTR("yaffs_writepage at %08x, size %08x\n"), - (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes)); - T(YAFFS_TRACE_OS, - (TSTR("writepag0: obj = %05x, ino = %05x\n"), - (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); - - T(YAFFS_TRACE_OS, - (TSTR("writepag1: obj = %05x, ino = %05x\n"), - (int)obj->variant.file_variant.file_size, (int)inode->i_size)); - + error = yaffs_set_xattrib(obj, name, value, size, flags); yaffs_gross_unlock(dev); - kunmap(page); - set_page_writeback(page); - unlock_page(page); - end_page_writeback(page); - put_page(page); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error); - return (n_written == n_bytes) ? 0 : -ENOSPC; + return error; } -static int yaffs_write_begin(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) +static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, + void *buff, size_t size) { - 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); + struct inode *inode = dentry->d_inode; + int error; + struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); - *pagep = pg; - if (!pg) { - ret = -ENOMEM; - goto out; - } - T(YAFFS_TRACE_OS, - (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"), - (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0)); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_getxattr \"%s\" from object %d", + name, obj->obj_id); - /* Get fs space */ - space_held = yaffs_hold_space(filp); + dev = obj->my_dev; + yaffs_gross_lock(dev); + error = yaffs_get_xattrib(obj, name, buff, size); + yaffs_gross_unlock(dev); - if (!space_held) { - ret = -ENOSPC; - goto out; - } + yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error); - /* Update page if required */ + return error; +} - if (!Page_Uptodate(pg)) - ret = yaffs_readpage_nolock(filp, pg); +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); - if (ret) - goto out; + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_removexattr of object %d", obj->obj_id); - /* Happy path return */ - T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n"))); + dev = obj->my_dev; + yaffs_gross_lock(dev); + error = yaffs_remove_xattrib(obj, name); + yaffs_gross_unlock(dev); - return 0; + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_removexattr done returning %d", error); -out: - T(YAFFS_TRACE_OS, - (TSTR("end yaffs_write_begin fail returning %d\n"), ret)); - if (space_held) - yaffs_release_space(filp); - if (pg) { - unlock_page(pg); - page_cache_release(pg); - } - return ret; + return error; } -static int yaffs_write_end(struct file *filp, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *pg, void *fsdadata) +static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size) { - int ret = 0; - void *addr, *kva; - uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1); - - kva = kmap(pg); - addr = kva + offset_into_page; - - T(YAFFS_TRACE_OS, - ("yaffs_write_end addr %p pos %x n_bytes %d\n", - addr, (unsigned)pos, copied)); + struct inode *inode = dentry->d_inode; + int error; + struct yaffs_dev *dev; + struct yaffs_obj *obj = yaffs_inode_to_obj(inode); - ret = yaffs_file_write(filp, addr, copied, &pos); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_listxattr of object %d", obj->obj_id); - if (ret != copied) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_write_end not same size ret %d copied %d\n"), - ret, copied)); - SetPageError(pg); - } else { - /* Nothing */ - } + dev = obj->my_dev; + yaffs_gross_lock(dev); + error = yaffs_list_xattrib(obj, buff, size); + yaffs_gross_unlock(dev); - kunmap(pg); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_listxattr done returning %d", error); - yaffs_release_space(filp); - unlock_page(pg); - page_cache_release(pg); - return ret; + return error; } -static void yaffs_fill_inode_from_obj(struct inode *inode, - struct yaffs_obj *obj) -{ - if (inode && obj) { +#endif - /* 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; - } +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. + */ - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - if (!S_ISDIR(mode)) { - obj->yst_mode &= ~S_IFMT; - obj->yst_mode |= S_IFDIR; - } +struct yaffs_search_context { + struct yaffs_dev *dev; + struct yaffs_obj *dir_obj; + struct yaffs_obj *next_return; + struct list_head others; +}; - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_SPECIAL: - default: - /* TODO? */ - break; - } +/* + * 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); - inode->i_flags |= S_NOATIME; + if (!sc) + return NULL; - inode->i_ino = obj->obj_id; - inode->i_mode = obj->yst_mode; - inode->i_uid = obj->yst_uid; - inode->i_gid = obj->yst_gid; + 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)); - inode->i_rdev = old_decode_dev(obj->yst_rdev); + return sc; +} - 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; +/* + * 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); + } +} - inode->i_nlink = yaffs_get_obj_link_count(obj); +/* + * 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; - T(YAFFS_TRACE_OS, - (TSTR - ("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"), - inode->i_mode, inode->i_uid, inode->i_gid, - (int)inode->i_size, atomic_read(&inode->i_count))); + 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; - 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; - } + 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_inode_to_obj_lv(inode) = obj; +/* + * 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) +{ - obj->my_inode = inode; + struct list_head *i; + struct yaffs_search_context *sc; + struct list_head *search_contexts = + &(yaffs_dev_to_lc(obj->my_dev)->search_contexts); - } else { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_fill_inode invalid parameters\n"))); + /* 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); } } -struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, - struct yaffs_obj *obj) +static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) { - struct inode *inode; + 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]; - if (!sb) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_get_inode for NULL super_block!!\n"))); - return NULL; + 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; } - if (!obj) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_get_inode for NULL object!!\n"))); - return NULL; + 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; } - T(YAFFS_TRACE_OS, - (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id)); + 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); - inode = Y_IGET(sb, obj->obj_id); - if (IS_ERR(inode)) - return NULL; + 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)); - /* 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! */ + yaffs_gross_unlock(dev); - return inode; + 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 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; +static const struct file_operations yaffs_dir_operations = { + .read = generic_read_dir, + .readdir = yaffs_readdir, + .fsync = yaffs_sync_object, + .llseek = generic_file_llseek, +}; - obj = yaffs_dentry_to_obj(f->f_dentry); - dev = obj->my_dev; - yaffs_gross_lock(dev); +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; - inode = f->f_dentry->d_inode; + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_file_flush object %d (%s)", + obj->obj_id, obj->dirty ? "dirty" : "clean"); - if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) - ipos = inode->i_size; - else - ipos = *pos; + yaffs_gross_lock(dev); - if (!obj) - T(YAFFS_TRACE_OS, - (TSTR("yaffs_file_write: hey obj is null!\n"))); - else - T(YAFFS_TRACE_OS, - (TSTR("yaffs_file_write about to write writing %u(%x) bytes" - "to object %d at %d(%x)\n"), - (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos)); + yaffs_flush_file(obj, 1, 0); - n_written = yaffs_wr_file(obj, buf, ipos, n, 0); + yaffs_gross_unlock(dev); - yaffs_touch_super(dev); + return 0; +} - T(YAFFS_TRACE_OS, - (TSTR("yaffs_file_write: %d(%x) bytes written\n"), - (unsigned)n, (unsigned)n)); +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, +}; - if (n_written > 0) { - ipos += n_written; - *pos = ipos; - if (ipos > inode->i_size) { - inode->i_size = ipos; - inode->i_blocks = (ipos + 511) >> 9; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_file_write size updated to %d bytes, " - "%d blocks\n"), ipos, (int)(inode->i_blocks))); - } +/* ExportFS support */ +static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, + uint32_t generation) +{ + return yaffs_iget(sb, ino); +} - } - yaffs_gross_unlock(dev); - return (n_written == 0) && (n > 0) ? -ENOSPC : n_written; +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); } -/* 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 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); +} -static ssize_t yaffs_hold_space(struct file *f) +struct dentry *yaffs2_get_parent(struct dentry *dentry) { - struct yaffs_obj *obj; - struct yaffs_dev *dev; - int n_free_chunks; + 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, +}; - obj = yaffs_dentry_to_obj(f->f_dentry); - dev = obj->my_dev; +/*-----------------------------------------------------------------*/ + +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); - n_free_chunks = yaffs_get_n_free_chunks(dev); + alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); yaffs_gross_unlock(dev); - return (n_free_chunks > 20) ? 1 : 0; + if (!alias) + return -ENOMEM; + + ret = vfs_readlink(dentry, buffer, buflen, alias); + kfree(alias); + return ret; } -static void yaffs_release_space(struct file *f) +static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) { - struct yaffs_obj *obj; - struct yaffs_dev *dev; - - obj = yaffs_dentry_to_obj(f->f_dentry); - - dev = obj->my_dev; + 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; } -static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) +void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) { - 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; + kfree(alias); +} - char name[YAFFS_MAX_NAME_LENGTH + 1]; - obj = yaffs_dentry_to_obj(f->f_dentry); - dev = obj->my_dev; +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; - yaffs_gross_lock(dev); + /* 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_dev_to_lc(dev)->readdir_process = current; +/* 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; - offset = f->f_pos; + obj = yaffs_inode_to_obj(inode); - sc = yaffs_new_search(obj); - if (!sc) { - ret_val = -ENOMEM; - goto out; - } + 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"); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_readdir: starting at %d\n"), (int)offset)); + if (!inode->i_nlink && !is_bad_inode(inode)) + deleteme = 1; + truncate_inode_pages(&inode->i_data, 0); + end_writeback(inode); - if (offset == 0) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_readdir: entry . ino %d \n"), - (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; - } + if (deleteme && obj) { + dev = obj->my_dev; yaffs_gross_lock(dev); - offset++; - f->f_pos++; - } - if (offset == 1) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_readdir: entry .. ino %d \n"), - (int)f->f_dentry->d_parent->d_inode->i_ino)); + yaffs_del_obj(obj); 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); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_readdir: %s inode %d\n"), - 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); + if (obj) { + dev = obj->my_dev; + yaffs_gross_lock(dev); + yaffs_unstitch_obj(inode, obj); + yaffs_gross_unlock(dev); } -out: - yaffs_search_end(sc); - yaffs_dev_to_lc(dev)->readdir_process = NULL; - yaffs_gross_unlock(dev); - - return ret_val; } -/* - * File creation. Allocate an inode, and we're done.. - */ +static void yaffs_touch_super(struct yaffs_dev *dev) +{ + struct super_block *sb = yaffs_dev_to_lc(dev)->super; -#define YCRED(x) (x->cred) + yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb); + if (sb) + sb->s_dirt = 1; +} -static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, - dev_t rdev) +static int yaffs_readpage_nolock(struct file *f, struct page *pg) { - struct inode *inode; + /* Lifted from jffs2 */ - struct yaffs_obj *obj = NULL; + struct yaffs_obj *obj; + unsigned char *pg_buf; + int ret; struct yaffs_dev *dev; - struct yaffs_obj *parent = yaffs_inode_to_obj(dir); - - int error = -ENOSPC; - uid_t uid = YCRED(current)->fsuid; - gid_t gid = - (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid; + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_readpage_nolock at %08x, size %08x", + (unsigned)(pg->index << PAGE_CACHE_SHIFT), + (unsigned)PAGE_CACHE_SIZE); - if ((dir->i_mode & S_ISGID) && S_ISDIR(mode)) - mode |= S_ISGID; + obj = yaffs_dentry_to_obj(f->f_dentry); - if (parent) { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_mknod: parent object %d type %d\n"), - parent->obj_id, parent->variant_type)); - } else { - T(YAFFS_TRACE_OS, - (TSTR("yaffs_mknod: could not get parent object\n"))); - return -EPERM; - } + dev = obj->my_dev; - T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, " - "mode %x dev %x\n"), - dentry->d_name.name, mode, rdev)); + BUG_ON(!PageLocked(pg)); - dev = parent->my_dev; + pg_buf = kmap(pg); + /* FIXME: Can kmap fail? */ yaffs_gross_lock(dev); - switch (mode & S_IFMT) { - default: - /* Special (socket, fifo, device...) */ - T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n"))); - obj = - yaffs_create_special(parent, dentry->d_name.name, mode, uid, - gid, old_encode_dev(rdev)); - break; - case S_IFREG: /* file */ - T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n"))); - obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid, - gid); - break; - case S_IFDIR: /* directory */ - T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making directory\n"))); - obj = yaffs_create_dir(parent, dentry->d_name.name, mode, - uid, gid); - break; - case S_IFLNK: /* symlink */ - T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n"))); - obj = NULL; /* Do we ever get here? */ - break; - } + ret = yaffs_file_rd(obj, pg_buf, + pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); - /* 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); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_mknod created object %d count = %d\n"), - obj->obj_id, atomic_read(&inode->i_count))); - error = 0; - yaffs_fill_inode_from_obj(dir, parent); + if (ret >= 0) + ret = 0; + + if (ret) { + ClearPageUptodate(pg); + SetPageError(pg); } else { - T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod failed making object\n"))); - error = -ENOMEM; + SetPageUptodate(pg); + ClearPageError(pg); } - return error; + flush_dcache_page(pg); + kunmap(pg); + + yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done"); + return ret; } -static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) +static int yaffs_readpage_unlock(struct file *f, struct page *pg) { - int ret_val; - T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n"))); - ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); - return ret_val; + int ret = yaffs_readpage_nolock(f, pg); + + unlock_page(pg); + return ret; } -static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, - struct nameidata *n) +static int yaffs_readpage(struct file *f, struct page *pg) { - T(YAFFS_TRACE_OS, (TSTR("yaffs_create\n"))); - return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); + 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; } -static int yaffs_unlink(struct inode *dir, struct dentry *dentry) -{ - int ret_val; +/* 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; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_unlink %d:%s\n"), - (int)(dir->i_ino), dentry->d_name.name)); - obj = yaffs_inode_to_obj(dir); - dev = obj->my_dev; + if (!mapping) + BUG(); + inode = mapping->host; + if (!inode) + BUG(); + i_size = i_size_read(inode); - yaffs_gross_lock(dev); + end_index = i_size >> PAGE_CACHE_SHIFT; - ret_val = yaffs_unlinker(obj, dentry->d_name.name); + if (page->index < end_index) + n_bytes = PAGE_CACHE_SIZE; + else { + n_bytes = i_size & (PAGE_CACHE_SIZE - 1); - 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; + 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; + } } - yaffs_gross_unlock(dev); - return -ENOTEMPTY; -} -/* - * Create a link... - */ -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; + if (n_bytes != PAGE_CACHE_SIZE) + zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE); - T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n"))); + get_page(page); + + buffer = kmap(page); 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); + 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); - 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); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_link link count %d i_count %d\n"), - old_dentry->d_inode->i_nlink, - atomic_read(&old_dentry->d_inode->i_count))); - } + 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); - if (link) { - update_dir_time(dir); - return 0; - } + kunmap(page); + set_page_writeback(page); + unlock_page(page); + end_page_writeback(page); + put_page(page); - return -EPERM; + return (n_written == n_bytes) ? 0 : -ENOSPC; } -static int yaffs_symlink(struct inode *dir, struct dentry *dentry, - const char *symname) +/* 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; - uid_t uid = YCRED(current)->fsuid; - gid_t gid = - (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid; + int n_free_chunks; - T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n"))); + obj = yaffs_dentry_to_obj(f->f_dentry); + + dev = obj->my_dev; - 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; + n_free_chunks = yaffs_get_n_free_chunks(dev); - inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); - d_instantiate(dentry, inode); - update_dir_time(dir); - T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n"))); - return 0; - } else { - T(YAFFS_TRACE_OS, (TSTR("symlink not created\n"))); - } + yaffs_gross_unlock(dev); - return -ENOMEM; + return (n_free_chunks > 20) ? 1 : 0; } -static int yaffs_sync_object(struct file *file, int datasync) +static void yaffs_release_space(struct file *f) { - struct yaffs_obj *obj; struct yaffs_dev *dev; - struct dentry *dentry = file->f_path.dentry; - obj = yaffs_dentry_to_obj(dentry); + obj = yaffs_dentry_to_obj(f->f_dentry); dev = obj->my_dev; - T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, (TSTR("yaffs_sync_object\n"))); 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) +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 yaffs_dev *dev; - int ret_val = YAFFS_FAIL; - struct yaffs_obj *target; - - T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n"))); - 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)) { - - T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n"))); + struct page *pg = NULL; + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + int ret = 0; + int space_held = 0; - ret_val = YAFFS_FAIL; - } else { - /* Now does unlinking internally using shadowing mechanism */ - T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n"))); + /* Get a page */ + pg = grab_cache_page_write_begin(mapping, index, flags); - 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); + *pagep = pg; + if (!pg) { + ret = -ENOMEM; + goto out; } - yaffs_gross_unlock(dev); + yaffs_trace(YAFFS_TRACE_OS, + "start yaffs_write_begin index %d(%x) uptodate %d", + (int)index, (int)index, PageUptodate(pg) ? 1 : 0); - if (ret_val == YAFFS_OK) { - if (target) { - new_dentry->d_inode->i_nlink--; - mark_inode_dirty(new_dentry->d_inode); - } + /* Get fs space */ + space_held = yaffs_hold_space(filp); - update_dir_time(old_dir); - if (old_dir != new_dir) - update_dir_time(new_dir); - return 0; - } else { - return -ENOTEMPTY; + if (!space_held) { + ret = -ENOSPC; + goto out; } -} - -static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) -{ - struct inode *inode = dentry->d_inode; - int error = 0; - struct yaffs_dev *dev; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_setattr of object %d\n"), - yaffs_inode_to_obj(inode)->obj_id)); + /* Update page if required */ - /* Fail if a requested resize >= 2GB */ - if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) - error = -EINVAL; + if (!PageUptodate(pg)) + ret = yaffs_readpage_nolock(filp, pg); - if (error == 0) - error = inode_change_ok(inode, attr); - if (error == 0) { - int result; - if (!error) { - error = yaffs_vfs_setattr(inode, attr); - T(YAFFS_TRACE_OS, (TSTR("inode_setattr called\n"))); - if (attr->ia_valid & ATTR_SIZE) { - yaffs_vfs_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) { - T(YAFFS_TRACE_OS, (TSTR("resize to %d(%x)\n"), - (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); + if (ret) + goto out; - } + /* Happy path return */ + yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok"); - T(YAFFS_TRACE_OS, (TSTR("yaffs_setattr done returning %d\n"), error)); + return 0; - return error; +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; } -#ifdef CONFIG_YAFFS_XATTR -static int yaffs_setxattr(struct dentry *dentry, const char *name, - const void *value, size_t size, int flags) +static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, + loff_t *pos) { - struct inode *inode = dentry->d_inode; - int error = 0; + struct yaffs_obj *obj; + int n_written, ipos; + struct inode *inode; struct yaffs_dev *dev; - struct yaffs_obj *obj = yaffs_inode_to_obj(inode); - - T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr of object %d\n"), 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); + 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; } - T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr done returning %d\n"), 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); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_getxattr \"%s\" from object %d\n"), 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); + dev = obj->my_dev; - } - T(YAFFS_TRACE_OS, (TSTR("yaffs_getxattr done returning %d\n"), error)); + yaffs_gross_lock(dev); - return error; -} + inode = f->f_dentry->d_inode; -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); + if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) + ipos = inode->i_size; + else + ipos = *pos; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_removexattr of object %d\n"), obj->obj_id)); + 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); - 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); + n_written = yaffs_wr_file(obj, buf, ipos, n, 0); - } - T(YAFFS_TRACE_OS, - (TSTR("yaffs_removexattr done returning %d\n"), error)); + yaffs_touch_super(dev); - return error; + 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 ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size) +static int yaffs_write_end(struct file *filp, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *pg, void *fsdadata) { - struct inode *inode = dentry->d_inode; - int error = 0; - struct yaffs_dev *dev; - struct yaffs_obj *obj = yaffs_inode_to_obj(inode); + int ret = 0; + void *addr, *kva; + uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_listxattr of object %d\n"), obj->obj_id)); + kva = kmap(pg); + addr = kva + offset_into_page; - 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_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); } - T(YAFFS_TRACE_OS, (TSTR("yaffs_listxattr done returning %d\n"), error)); - return error; -} + kunmap(pg); -#endif + 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; - T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n"))); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs"); yaffs_gross_lock(dev); @@ -1679,11 +1428,12 @@ static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf) bytes_in_dev = ((uint64_t) - ((dev->param.end_block - dev->param.start_block + - 1))) * ((uint64_t) (dev->param.chunks_per_block * + ((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 */ + 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))) * @@ -1729,8 +1479,8 @@ static void yaffs_flush_inodes(struct super_block *sb) list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) { obj = yaffs_inode_to_obj(iptr); if (obj) { - T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"), - obj->obj_id)); + yaffs_trace(YAFFS_TRACE_OS, + "flushing obj %d", obj->obj_id); yaffs_flush_file(obj, 1, 0); } } @@ -1739,6 +1489,7 @@ static void yaffs_flush_inodes(struct super_block *sb) static void yaffs_flush_super(struct super_block *sb, int do_checkpoint) { struct yaffs_dev *dev = yaffs_super_to_dev(sb); + if (!dev) return; @@ -1779,12 +1530,12 @@ static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint) unsigned gc_urgent = yaffs_bg_gc_urgency(dev); int do_checkpoint; - T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, - (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"), - gc_urgent, - sb->s_dirt ? "dirty" : "clean", - request_checkpoint ? "checkpoint requested" : "no checkpoint", - oneshot_checkpoint ? " one-shot" : "")); + 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) || @@ -1807,7 +1558,7 @@ static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint) * yaffs_bg_start() launches the background thread. * yaffs_bg_stop() cleans up the background thread. * - * NB: + * 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. @@ -1827,16 +1578,15 @@ static int yaffs_bg_thread_fn(void *data) unsigned long next_gc = now; unsigned long expires; unsigned int urgency; - int gc_result; struct timer_list timer; - T(YAFFS_TRACE_BACKGROUND, - (TSTR("yaffs_background starting for dev %p\n"), (void *)dev)); + yaffs_trace(YAFFS_TRACE_BACKGROUND, + "yaffs_background starting for dev %p", (void *)dev); set_freezable(); while (context->bg_running) { - T(YAFFS_TRACE_BACKGROUND, (TSTR("yaffs_background\n"))); + yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background"); if (kthread_should_stop()) break; @@ -1864,12 +1614,12 @@ static int yaffs_bg_thread_fn(void *data) 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; @@ -1878,7 +1628,7 @@ static int yaffs_bg_thread_fn(void *data) if (time_before(expires, now)) expires = now + HZ; - Y_INIT_TIMER(&timer); + init_timer_on_stack(&timer); timer.expires = expires + 1; timer.data = (unsigned long)current; timer.function = yaffs_background_waker; @@ -1930,9 +1680,9 @@ static void yaffs_write_super(struct super_block *sb) { unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2); - T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, - (TSTR("yaffs_write_super%s\n"), - request_checkpoint ? " checkpt" : "")); + 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); @@ -1942,101 +1692,17 @@ static int yaffs_sync_fs(struct super_block *sb, int wait) { unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1); - T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, - (TSTR("yaffs_sync_fs%s\n"), request_checkpoint ? " checkpt" : "")); + 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 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); - - T(YAFFS_TRACE_OS, (TSTR("yaffs_iget for %lu\n"), 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; -} - static LIST_HEAD(yaffs_context_list); struct mutex yaffs_context_lock; -static void yaffs_put_super(struct super_block *sb) -{ - struct yaffs_dev *dev = yaffs_super_to_dev(sb); - - T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n"))); - - T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, - (TSTR("Shutting down yaffs background thread\n"))); - yaffs_bg_stop(dev); - T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, - (TSTR("yaffs background thread shut down\n"))); - - 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) { - YFREE(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 void yaffs_touch_super(struct yaffs_dev *dev) -{ - struct super_block *sb = yaffs_dev_to_lc(dev)->super; - - T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb)); - if (sb) - sb->s_dirt = 1; -} - struct yaffs_options { int inband_tags; int skip_checkpoint_read; @@ -2052,7 +1718,7 @@ struct yaffs_options { #define MAX_OPT_LEN 30 static int yaffs_parse_options(struct yaffs_options *options, - const char *options_str) + const char *options_str) { char cur_opt[MAX_OPT_LEN + 1]; int p; @@ -2110,10 +1776,178 @@ static int yaffs_parse_options(struct yaffs_options *options, 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, +#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) { + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_fill_inode invalid parameters"); + return; + } + + /* 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; +} + +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) @@ -2128,16 +1962,18 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, 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; @@ -2146,9 +1982,7 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, sb->s_export_op = &yaffs_export_ops; - if (!sb) - printk(KERN_INFO "yaffs: sb is NULL\n"); - else if (!sb->s_dev) + 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"); @@ -2164,22 +1998,22 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, memset(&options, 0, sizeof(options)); - if (yaffs_parse_options(&options, data_str)) { + 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; - T(YAFFS_TRACE_OS, - (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version)); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_read_super: block size %d\n"), (int)(sb->s_blocksize))); + 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)); - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"), - MAJOR(sb->s_dev), MINOR(sb->s_dev), yaffs_devname(sb, devname_buf))); + 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) @@ -2188,42 +2022,42 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, /* Get the device */ mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); if (!mtd) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"), - MINOR(sb->s_dev))); + 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) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: MTD device is not NAND it's type %d\n"), - mtd->type)); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device is not NAND it's type %d", + mtd->type); return NULL; } - T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase)); - T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read)); - T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write)); - T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob)); - T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob)); - T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad)); - T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad)); - T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd))); - T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize)); - T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize)); - T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size)); + 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); #ifdef CONFIG_YAFFS_AUTO_YAFFS2 - if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) { - T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs2\n"))); + if (yaffs_version == 1 && mtd->writesize >= 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) { - T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs1\n"))); + if (yaffs_version == 2 && !options.inband_tags && + mtd->writesize == 512) { + yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1"); yaffs_version = 1; } #endif @@ -2235,18 +2069,16 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, !mtd->block_markbad || !mtd->read || !mtd->write || !mtd->read_oob || !mtd->write_oob) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: MTD device does not support required " - "functions\n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device does not support required functions"); return NULL; } - if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE || + if ((mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE || mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) && !options.inband_tags) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: MTD device does not have the " - "right page sizes\n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device does not have the right page sizes"); return NULL; } } else { @@ -2254,17 +2086,15 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, if (!mtd->erase || !mtd->read || !mtd->write || !mtd->read_oob || !mtd->write_oob) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: MTD device does not support required " - "functions\n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device does not support required functions"); return NULL; } - if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK || + if (mtd->writesize < YAFFS_BYTES_PER_CHUNK || mtd->oobsize != YAFFS_BYTES_PER_SPARE) { - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs: MTD device does not support have the " - "right page sizes\n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "MTD device does not support have the right page sizes"); return NULL; } } @@ -2285,19 +2115,16 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL); if (!dev || !context) { - if (dev) - kfree(dev); - if (context) - kfree(context); + kfree(dev); + kfree(context); dev = NULL; context = NULL; } if (!dev) { /* Deep shit could not allocate device structure */ - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs_read_super: Failed trying to allocate " - "struct yaffs_dev. \n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs_read_super failed trying to allocate yaffs_dev"); return NULL; } memset(dev, 0, sizeof(struct yaffs_dev)); @@ -2374,7 +2201,8 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, 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 = YMALLOC(mtd->oobsize); + 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; @@ -2410,13 +2238,12 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, mutex_lock(&yaffs_context_lock); /* Get a mount id */ - found = 0; - for (mount_id = 0; !found; 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); + list_entry(l, struct yaffs_linux_context, + context_list); if (context_iterator->mount_id == mount_id) found = 0; } @@ -2437,9 +2264,9 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, err = yaffs_guts_initialise(dev); - T(YAFFS_TRACE_OS, - (TSTR("yaffs_read_super: guts initialised %s\n"), - (err == YAFFS_OK) ? "OK" : "FAILED")); + yaffs_trace(YAFFS_TRACE_OS, + "yaffs_read_super: guts initialised %s", + (err == YAFFS_OK) ? "OK" : "FAILED"); if (err == YAFFS_OK) yaffs_bg_start(dev); @@ -2460,11 +2287,11 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, inode->i_op = &yaffs_dir_inode_operations; inode->i_fop = &yaffs_dir_operations; - T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n"))); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode"); root = d_alloc_root(inode); - T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n"))); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done"); if (!root) { iput(inode); @@ -2472,11 +2299,11 @@ static struct super_block *yaffs_internal_read_super(int yaffs_version, } sb->s_root = root; sb->s_dirt = !dev->is_checkpointed; - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs_read_super: is_checkpointed %d\n"), - dev->is_checkpointed)); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs_read_super: is_checkpointed %d", + dev->is_checkpointed); - T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n"))); + yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done"); return sb; } @@ -2532,40 +2359,28 @@ static struct proc_dir_entry *my_proc_entry; static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev) { - buf += - sprintf(buf, "start_block........... %d\n", dev->param.start_block); - buf += - sprintf(buf, "end_block............. %d\n", dev->param.end_block); - buf += - sprintf(buf, "total_bytes_per_chunk. %d\n", - dev->param.total_bytes_per_chunk); - buf += - sprintf(buf, "use_nand_ecc.......... %d\n", - dev->param.use_nand_ecc); - buf += - sprintf(buf, "no_tags_ecc........... %d\n", dev->param.no_tags_ecc); - buf += - sprintf(buf, "is_yaffs2............. %d\n", dev->param.is_yaffs2); - buf += - sprintf(buf, "inband_tags........... %d\n", dev->param.inband_tags); - buf += - sprintf(buf, "empty_lost_n_found.... %d\n", - dev->param.empty_lost_n_found); - buf += - sprintf(buf, "disable_lazy_load..... %d\n", - dev->param.disable_lazy_load); - buf += - sprintf(buf, "refresh_period........ %d\n", - dev->param.refresh_period); - buf += sprintf(buf, "n_caches.............. %d\n", dev->param.n_caches); - buf += - sprintf(buf, "n_reserved_blocks..... %d\n", - dev->param.n_reserved_blocks); - buf += - sprintf(buf, "always_check_erased... %d\n", - dev->param.always_check_erased); - - buf += sprintf(buf, "\n"); + 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; } @@ -2647,7 +2462,8 @@ static int yaffs_proc_read(char *page, mutex_lock(&yaffs_context_lock); - /* Locate and print the Nth entry. Order N-squared but N is small. */ + /* 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, @@ -2665,7 +2481,7 @@ static int yaffs_proc_read(char *page, buf = yaffs_dump_dev_part0(buf, dev); } else { buf = yaffs_dump_dev_part1(buf, dev); - } + } break; } @@ -2686,7 +2502,7 @@ static struct { char *mask_name; unsigned mask_bitfield; } mask_flags[] = { - {"allocate", YAFFS_TRACE_ALLOCATE}, + {"allocate", YAFFS_TRACE_ALLOCATE}, {"always", YAFFS_TRACE_ALWAYS}, {"background", YAFFS_TRACE_BACKGROUND}, {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS}, @@ -2837,20 +2653,19 @@ static int __init init_yaffs_fs(void) int error = 0; struct file_system_to_install *fsinst; - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs built " __DATE__ " " __TIME__ " Installing."); #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED - T(YAFFS_TRACE_ALWAYS, - (TSTR - (" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n"))); + 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); + S_IRUGO | S_IFREG, NULL); if (my_proc_entry) { my_proc_entry->write_proc = yaffs_proc_write; @@ -2858,7 +2673,7 @@ static int __init init_yaffs_fs(void) my_proc_entry->data = NULL; } else { return -ENOMEM; - } + } /* Now add the file system entries */ @@ -2893,10 +2708,10 @@ static void __exit exit_yaffs_fs(void) struct file_system_to_install *fsinst; - T(YAFFS_TRACE_ALWAYS, - (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n"))); + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs built " __DATE__ " " __TIME__ " removing."); - remove_proc_entry("yaffs", YPROC_ROOT); + remove_proc_entry("yaffs", NULL); fsinst = fs_to_install; @@ -2910,8 +2725,8 @@ static void __exit exit_yaffs_fs(void) } module_init(init_yaffs_fs) - module_exit(exit_yaffs_fs) +module_exit(exit_yaffs_fs) - MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); +MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010"); MODULE_LICENSE("GPL");