/* * Copyright (C) 2005, 2006 * Avishay Traeger (avishay@gmail.com) * Copyright (C) 2008, 2009 * Boaz Harrosh <bharrosh@panasas.com> * * Copyrights for code taken from ext2: * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * from * linux/fs/minix/inode.c * Copyright (C) 1991, 1992 Linus Torvalds * * This file is part of exofs. * * exofs is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation. Since it is based on ext2, and the only * valid version of GPL for the Linux kernel is version 2, the only valid * version of GPL for exofs is version 2. * * exofs is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with exofs; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "exofs.h" static inline int exofs_add_nondir(struct dentry *dentry, struct inode *inode) { int err = exofs_add_link(dentry, inode); if (!err) { d_instantiate(dentry, inode); return 0; } inode_dec_link_count(inode); iput(inode); return err; } static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct inode *inode; ino_t ino; if (dentry->d_name.len > EXOFS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = exofs_inode_by_name(dir, dentry); inode = NULL; if (ino) { inode = exofs_iget(dir->i_sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); } return d_splice_alias(inode, dentry); } static int exofs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { struct inode *inode = exofs_new_inode(dir, mode); int err = PTR_ERR(inode); if (!IS_ERR(inode)) { inode->i_op = &exofs_file_inode_operations; inode->i_fop = &exofs_file_operations; inode->i_mapping->a_ops = &exofs_aops; mark_inode_dirty(inode); err = exofs_add_nondir(dentry, inode); } return err; } static int exofs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) { struct inode *inode; int err; if (!new_valid_dev(rdev)) return -EINVAL; inode = exofs_new_inode(dir, mode); err = PTR_ERR(inode); if (!IS_ERR(inode)) { init_special_inode(inode, inode->i_mode, rdev); mark_inode_dirty(inode); err = exofs_add_nondir(dentry, inode); } return err; } static int exofs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { struct super_block *sb = dir->i_sb; int err = -ENAMETOOLONG; unsigned l = strlen(symname)+1; struct inode *inode; struct exofs_i_info *oi; if (l > sb->s_blocksize) goto out; inode = exofs_new_inode(dir, S_IFLNK | S_IRWXUGO); err = PTR_ERR(inode); if (IS_ERR(inode)) goto out; oi = exofs_i(inode); if (l > sizeof(oi->i_data)) { /* slow symlink */ inode->i_op = &exofs_symlink_inode_operations; inode->i_mapping->a_ops = &exofs_aops; memset(oi->i_data, 0, sizeof(oi->i_data)); err = page_symlink(inode, symname, l); if (err) goto out_fail; } else { /* fast symlink */ inode->i_op = &exofs_fast_symlink_inode_operations; memcpy(oi->i_data, symname, l); inode->i_size = l-1; } mark_inode_dirty(inode); err = exofs_add_nondir(dentry, inode); out: return err; out_fail: inode_dec_link_count(inode); iput(inode); goto out; } static int exofs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { struct inode *inode = old_dentry->d_inode; if (inode->i_nlink >= EXOFS_LINK_MAX) return -EMLINK; inode->i_ctime = CURRENT_TIME; inode_inc_link_count(inode); ihold(inode); return exofs_add_nondir(dentry, inode); } static int exofs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { struct inode *inode; int err = -EMLINK; if (dir->i_nlink >= EXOFS_LINK_MAX) goto out; inode_inc_link_count(dir); inode = exofs_new_inode(dir, S_IFDIR | mode); err = PTR_ERR(inode); if (IS_ERR(inode)) goto out_dir; inode->i_op = &exofs_dir_inode_operations; inode->i_fop = &exofs_dir_operations; inode->i_mapping->a_ops = &exofs_aops; inode_inc_link_count(inode); err = exofs_make_empty(inode, dir); if (err) goto out_fail; err = exofs_add_link(dentry, inode); if (err) goto out_fail; d_instantiate(dentry, inode); out: return err; out_fail: inode_dec_link_count(inode); inode_dec_link_count(inode); iput(inode); out_dir: inode_dec_link_count(dir); goto out; } static int exofs_unlink(struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; struct exofs_dir_entry *de; struct page *page; int err = -ENOENT; de = exofs_find_entry(dir, dentry, &page); if (!de) goto out; err = exofs_delete_entry(de, page); if (err) goto out; inode->i_ctime = dir->i_ctime; inode_dec_link_count(inode); err = 0; out: return err; } static int exofs_rmdir(struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; int err = -ENOTEMPTY; if (exofs_empty_dir(inode)) { err = exofs_unlink(dir, dentry); if (!err) { inode->i_size = 0; inode_dec_link_count(inode); inode_dec_link_count(dir); } } return err; } static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { struct inode *old_inode = old_dentry->d_inode; struct inode *new_inode = new_dentry->d_inode; struct page *dir_page = NULL; struct exofs_dir_entry *dir_de = NULL; struct page *old_page; struct exofs_dir_entry *old_de; int err = -ENOENT; old_de = exofs_find_entry(old_dir, old_dentry, &old_page); if (!old_de) goto out; if (S_ISDIR(old_inode->i_mode)) { err = -EIO; dir_de = exofs_dotdot(old_inode, &dir_page); if (!dir_de) goto out_old; } if (new_inode) { struct page *new_page; struct exofs_dir_entry *new_de; err = -ENOTEMPTY; if (dir_de && !exofs_empty_dir(new_inode)) goto out_dir; err = -ENOENT; new_de = exofs_find_entry(new_dir, new_dentry, &new_page); if (!new_de) goto out_dir; err = exofs_set_link(new_dir, new_de, new_page, old_inode); new_inode->i_ctime = CURRENT_TIME; if (dir_de) drop_nlink(new_inode); inode_dec_link_count(new_inode); if (err) goto out_dir; } else { if (dir_de) { err = -EMLINK; if (new_dir->i_nlink >= EXOFS_LINK_MAX) goto out_dir; } err = exofs_add_link(new_dentry, old_inode); if (err) goto out_dir; if (dir_de) inode_inc_link_count(new_dir); } old_inode->i_ctime = CURRENT_TIME; exofs_delete_entry(old_de, old_page); mark_inode_dirty(old_inode); if (dir_de) { err = exofs_set_link(old_inode, dir_de, dir_page, new_dir); inode_dec_link_count(old_dir); if (err) goto out_dir; } return 0; out_dir: if (dir_de) { kunmap(dir_page); page_cache_release(dir_page); } out_old: kunmap(old_page); page_cache_release(old_page); out: return err; } const struct inode_operations exofs_dir_inode_operations = { .create = exofs_create, .lookup = exofs_lookup, .link = exofs_link, .unlink = exofs_unlink, .symlink = exofs_symlink, .mkdir = exofs_mkdir, .rmdir = exofs_rmdir, .mknod = exofs_mknod, .rename = exofs_rename, .setattr = exofs_setattr, }; const struct inode_operations exofs_special_inode_operations = { .setattr = exofs_setattr, };