/* * linux/fs/ufs/namei.c * * Migration to usage of "page cache" on May 2006 by * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. * * Copyright (C) 1998 * Daniel Pirkl <daniel.pirkl@email.cz> * Charles University, Faculty of Mathematics and Physics * * from * * linux/fs/ext2/namei.c * * 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/namei.c * * Copyright (C) 1991, 1992 Linus Torvalds * * Big-endian to little-endian byte-swapping/bitmaps by * David S. Miller (davem@caip.rutgers.edu), 1995 */ #include <linux/time.h> #include <linux/fs.h> #include <linux/ufs_fs.h> #include <linux/smp_lock.h> #include "ufs.h" #include "util.h" static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) { int err = ufs_add_link(dentry, inode); if (!err) { d_instantiate(dentry, inode); return 0; } inode_dec_link_count(inode); iput(inode); return err; } static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) { struct inode * inode = NULL; ino_t ino; if (dentry->d_name.len > UFS_MAXNAMLEN) return ERR_PTR(-ENAMETOOLONG); lock_kernel(); ino = ufs_inode_by_name(dir, dentry); if (ino) { inode = iget(dir->i_sb, ino); if (!inode) { unlock_kernel(); return ERR_PTR(-EACCES); } } unlock_kernel(); d_add(dentry, inode); return NULL; } /* * By the time this is called, we already have created * the directory cache entry for the new file, but it * is so far negative - it has no inode. * * If the create succeeds, we fill in the inode information * with d_instantiate(). */ static int ufs_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd) { struct inode *inode; int err; UFSD("BEGIN\n"); inode = ufs_new_inode(dir, mode); err = PTR_ERR(inode); if (!IS_ERR(inode)) { inode->i_op = &ufs_file_inode_operations; inode->i_fop = &ufs_file_operations; inode->i_mapping->a_ops = &ufs_aops; mark_inode_dirty(inode); lock_kernel(); err = ufs_add_nondir(dentry, inode); unlock_kernel(); } UFSD("END: err=%d\n", err); return err; } static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) { struct inode *inode; int err; if (!old_valid_dev(rdev)) return -EINVAL; inode = ufs_new_inode(dir, mode); err = PTR_ERR(inode); if (!IS_ERR(inode)) { init_special_inode(inode, mode, rdev); ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); mark_inode_dirty(inode); lock_kernel(); err = ufs_add_nondir(dentry, inode); unlock_kernel(); } return err; } static int ufs_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; if (l > sb->s_blocksize) goto out_notlocked; lock_kernel(); inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); err = PTR_ERR(inode); if (IS_ERR(inode)) goto out; if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { /* slow symlink */ inode->i_op = &page_symlink_inode_operations; inode->i_mapping->a_ops = &ufs_aops; err = page_symlink(inode, symname, l); if (err) goto out_fail; } else { /* fast symlink */ inode->i_op = &ufs_fast_symlink_inode_operations; memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l); inode->i_size = l-1; } mark_inode_dirty(inode); err = ufs_add_nondir(dentry, inode); out: unlock_kernel(); out_notlocked: return err; out_fail: inode_dec_link_count(inode); iput(inode); goto out; } static int ufs_link (struct dentry * old_dentry, struct inode * dir, struct dentry *dentry) { struct inode *inode = old_dentry->d_inode; int error; lock_kernel(); if (inode->i_nlink >= UFS_LINK_MAX) { unlock_kernel(); return -EMLINK; } inode->i_ctime = CURRENT_TIME_SEC; inode_inc_link_count(inode); atomic_inc(&inode->i_count); error = ufs_add_nondir(dentry, inode); unlock_kernel(); return error; } static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode) { struct inode * inode; int err = -EMLINK; if (dir->i_nlink >= UFS_LINK_MAX) goto out; lock_kernel(); inode_inc_link_count(dir); inode = ufs_new_inode(dir, S_IFDIR|mode); err = PTR_ERR(inode); if (IS_ERR(inode)) goto out_dir; inode->i_op = &ufs_dir_inode_operations; inode->i_fop = &ufs_dir_operations; inode->i_mapping->a_ops = &ufs_aops; inode_inc_link_count(inode); err = ufs_make_empty(inode, dir); if (err) goto out_fail; err = ufs_add_link(dentry, inode); if (err) goto out_fail; unlock_kernel(); 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); unlock_kernel(); goto out; } static int ufs_unlink(struct inode *dir, struct dentry *dentry) { struct inode * inode = dentry->d_inode; struct ufs_dir_entry *de; struct page *page; int err = -ENOENT; de = ufs_find_entry(dir, dentry, &page); if (!de) goto out; err = ufs_delete_entry(dir, de, page); if (err) goto out; inode->i_ctime = dir->i_ctime; inode_dec_link_count(inode); err = 0; out: return err; } static int ufs_rmdir (struct inode * dir, struct dentry *dentry) { struct inode * inode = dentry->d_inode; int err= -ENOTEMPTY; lock_kernel(); if (ufs_empty_dir (inode)) { err = ufs_unlink(dir, dentry); if (!err) { inode->i_size = 0; inode_dec_link_count(inode); inode_dec_link_count(dir); } } unlock_kernel(); return err; } static int ufs_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 ufs_dir_entry * dir_de = NULL; struct page *old_page; struct ufs_dir_entry *old_de; int err = -ENOENT; old_de = ufs_find_entry(old_dir, old_dentry, &old_page); if (!old_de) goto out; if (S_ISDIR(old_inode->i_mode)) { err = -EIO; dir_de = ufs_dotdot(old_inode, &dir_page); if (!dir_de) goto out_old; } if (new_inode) { struct page *new_page; struct ufs_dir_entry *new_de; err = -ENOTEMPTY; if (dir_de && !ufs_empty_dir(new_inode)) goto out_dir; err = -ENOENT; new_de = ufs_find_entry(new_dir, new_dentry, &new_page); if (!new_de) goto out_dir; inode_inc_link_count(old_inode); ufs_set_link(new_dir, new_de, new_page, old_inode); new_inode->i_ctime = CURRENT_TIME_SEC; if (dir_de) drop_nlink(new_inode); inode_dec_link_count(new_inode); } else { if (dir_de) { err = -EMLINK; if (new_dir->i_nlink >= UFS_LINK_MAX) goto out_dir; } inode_inc_link_count(old_inode); err = ufs_add_link(new_dentry, old_inode); if (err) { inode_dec_link_count(old_inode); goto out_dir; } if (dir_de) inode_inc_link_count(new_dir); } /* * Like most other Unix systems, set the ctime for inodes on a * rename. * inode_dec_link_count() will mark the inode dirty. */ old_inode->i_ctime = CURRENT_TIME_SEC; ufs_delete_entry(old_dir, old_de, old_page); inode_dec_link_count(old_inode); if (dir_de) { ufs_set_link(old_inode, dir_de, dir_page, new_dir); inode_dec_link_count(old_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 ufs_dir_inode_operations = { .create = ufs_create, .lookup = ufs_lookup, .link = ufs_link, .unlink = ufs_unlink, .symlink = ufs_symlink, .mkdir = ufs_mkdir, .rmdir = ufs_rmdir, .mknod = ufs_mknod, .rename = ufs_rename, };