--- /dev/null
+/*
+ * 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 "ufs_fs.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) {
+ unlock_new_inode(inode);
+ d_instantiate(dentry, inode);
+ return 0;
+ }
+ inode_dec_link_count(inode);
+ unlock_new_inode(inode);
+ iput(inode);
+ return err;
+}
+
+static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
+{
+ struct inode * inode = NULL;
+ ino_t ino;
+
+ if (dentry->d_name.len > UFS_MAXNAMLEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ lock_ufs(dir->i_sb);
+ ino = ufs_inode_by_name(dir, &dentry->d_name);
+ if (ino)
+ inode = ufs_iget(dir->i_sb, ino);
+ unlock_ufs(dir->i_sb);
+ return d_splice_alias(inode, dentry);
+}
+
+/*
+ * 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, umode_t mode,
+ bool excl)
+{
+ 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_ufs(dir->i_sb);
+ err = ufs_add_nondir(dentry, inode);
+ unlock_ufs(dir->i_sb);
+ }
+ UFSD("END: err=%d\n", err);
+ return err;
+}
+
+static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t 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_ufs(dir->i_sb);
+ err = ufs_add_nondir(dentry, inode);
+ unlock_ufs(dir->i_sb);
+ }
+ 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_ufs(dir->i_sb);
+ 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 = &ufs_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(UFS_I(inode)->i_u1.i_symlink, symname, l);
+ inode->i_size = l-1;
+ }
+ mark_inode_dirty(inode);
+
+ err = ufs_add_nondir(dentry, inode);
+out:
+ unlock_ufs(dir->i_sb);
+out_notlocked:
+ return err;
+
+out_fail:
+ inode_dec_link_count(inode);
+ unlock_new_inode(inode);
+ iput(inode);
+ goto out;
+}
+
+static int ufs_link (struct dentry * old_dentry, struct inode * dir,
+ struct dentry *dentry)
+{
+ struct inode *inode = d_inode(old_dentry);
+ int error;
+
+ lock_ufs(dir->i_sb);
+
+ inode->i_ctime = CURRENT_TIME_SEC;
+ inode_inc_link_count(inode);
+ ihold(inode);
+
+ error = ufs_add_link(dentry, inode);
+ if (error) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ } else
+ d_instantiate(dentry, inode);
+ unlock_ufs(dir->i_sb);
+ return error;
+}
+
+static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+{
+ struct inode * inode;
+ int err;
+
+ lock_ufs(dir->i_sb);
+ 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_ufs(dir->i_sb);
+
+ unlock_new_inode(inode);
+ d_instantiate(dentry, inode);
+out:
+ return err;
+
+out_fail:
+ inode_dec_link_count(inode);
+ inode_dec_link_count(inode);
+ unlock_new_inode(inode);
+ iput (inode);
+out_dir:
+ inode_dec_link_count(dir);
+ unlock_ufs(dir->i_sb);
+ goto out;
+}
+
+static int ufs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct inode * inode = d_inode(dentry);
+ struct ufs_dir_entry *de;
+ struct page *page;
+ int err = -ENOENT;
+
+ de = ufs_find_entry(dir, &dentry->d_name, &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 = d_inode(dentry);
+ int err= -ENOTEMPTY;
+
+ lock_ufs(dir->i_sb);
+ 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_ufs(dir->i_sb);
+ 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 = d_inode(old_dentry);
+ struct inode *new_inode = d_inode(new_dentry);
+ 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->d_name, &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->d_name, &new_page);
+ if (!new_de)
+ goto out_dir;
+ 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 {
+ err = ufs_add_link(new_dentry, old_inode);
+ if (err)
+ 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.
+ */
+ old_inode->i_ctime = CURRENT_TIME_SEC;
+
+ ufs_delete_entry(old_dir, old_de, old_page);
+ mark_inode_dirty(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,
+};
Code Review / kvmfornfv.git / blobdiff