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Linux/fs/ufs/namei.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/fs/ufs/namei.c
  4  *
  5  * Migration to usage of "page cache" on May 2006 by
  6  * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
  7  *
  8  * Copyright (C) 1998
  9  * Daniel Pirkl <daniel.pirkl@email.cz>
 10  * Charles University, Faculty of Mathematics and Physics
 11  *
 12  *  from
 13  *
 14  *  linux/fs/ext2/namei.c
 15  *
 16  * Copyright (C) 1992, 1993, 1994, 1995
 17  * Remy Card (card@masi.ibp.fr)
 18  * Laboratoire MASI - Institut Blaise Pascal
 19  * Universite Pierre et Marie Curie (Paris VI)
 20  *
 21  *  from
 22  *
 23  *  linux/fs/minix/namei.c
 24  *
 25  *  Copyright (C) 1991, 1992  Linus Torvalds
 26  *
 27  *  Big-endian to little-endian byte-swapping/bitmaps by
 28  *        David S. Miller (davem@caip.rutgers.edu), 1995
 29  */
 30 
 31 #include <linux/time.h>
 32 #include <linux/fs.h>
 33 
 34 #include "ufs_fs.h"
 35 #include "ufs.h"
 36 #include "util.h"
 37 
 38 static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
 39 {
 40         int err = ufs_add_link(dentry, inode);
 41         if (!err) {
 42                 d_instantiate_new(dentry, inode);
 43                 return 0;
 44         }
 45         inode_dec_link_count(inode);
 46         discard_new_inode(inode);
 47         return err;
 48 }
 49 
 50 static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
 51 {
 52         struct inode * inode = NULL;
 53         ino_t ino;
 54         
 55         if (dentry->d_name.len > UFS_MAXNAMLEN)
 56                 return ERR_PTR(-ENAMETOOLONG);
 57 
 58         ino = ufs_inode_by_name(dir, &dentry->d_name);
 59         if (ino)
 60                 inode = ufs_iget(dir->i_sb, ino);
 61         return d_splice_alias(inode, dentry);
 62 }
 63 
 64 /*
 65  * By the time this is called, we already have created
 66  * the directory cache entry for the new file, but it
 67  * is so far negative - it has no inode.
 68  *
 69  * If the create succeeds, we fill in the inode information
 70  * with d_instantiate(). 
 71  */
 72 static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
 73                 bool excl)
 74 {
 75         struct inode *inode;
 76 
 77         inode = ufs_new_inode(dir, mode);
 78         if (IS_ERR(inode))
 79                 return PTR_ERR(inode);
 80 
 81         inode->i_op = &ufs_file_inode_operations;
 82         inode->i_fop = &ufs_file_operations;
 83         inode->i_mapping->a_ops = &ufs_aops;
 84         mark_inode_dirty(inode);
 85         return ufs_add_nondir(dentry, inode);
 86 }
 87 
 88 static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
 89 {
 90         struct inode *inode;
 91         int err;
 92 
 93         if (!old_valid_dev(rdev))
 94                 return -EINVAL;
 95 
 96         inode = ufs_new_inode(dir, mode);
 97         err = PTR_ERR(inode);
 98         if (!IS_ERR(inode)) {
 99                 init_special_inode(inode, mode, rdev);
100                 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
101                 mark_inode_dirty(inode);
102                 err = ufs_add_nondir(dentry, inode);
103         }
104         return err;
105 }
106 
107 static int ufs_symlink (struct inode * dir, struct dentry * dentry,
108         const char * symname)
109 {
110         struct super_block * sb = dir->i_sb;
111         int err;
112         unsigned l = strlen(symname)+1;
113         struct inode * inode;
114 
115         if (l > sb->s_blocksize)
116                 return -ENAMETOOLONG;
117 
118         inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
119         err = PTR_ERR(inode);
120         if (IS_ERR(inode))
121                 return err;
122 
123         if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
124                 /* slow symlink */
125                 inode->i_op = &page_symlink_inode_operations;
126                 inode_nohighmem(inode);
127                 inode->i_mapping->a_ops = &ufs_aops;
128                 err = page_symlink(inode, symname, l);
129                 if (err)
130                         goto out_fail;
131         } else {
132                 /* fast symlink */
133                 inode->i_op = &simple_symlink_inode_operations;
134                 inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
135                 memcpy(inode->i_link, symname, l);
136                 inode->i_size = l-1;
137         }
138         mark_inode_dirty(inode);
139 
140         return ufs_add_nondir(dentry, inode);
141 
142 out_fail:
143         inode_dec_link_count(inode);
144         discard_new_inode(inode);
145         return err;
146 }
147 
148 static int ufs_link (struct dentry * old_dentry, struct inode * dir,
149         struct dentry *dentry)
150 {
151         struct inode *inode = d_inode(old_dentry);
152         int error;
153 
154         inode->i_ctime = current_time(inode);
155         inode_inc_link_count(inode);
156         ihold(inode);
157 
158         error = ufs_add_link(dentry, inode);
159         if (error) {
160                 inode_dec_link_count(inode);
161                 iput(inode);
162         } else
163                 d_instantiate(dentry, inode);
164         return error;
165 }
166 
167 static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
168 {
169         struct inode * inode;
170         int err;
171 
172         inode_inc_link_count(dir);
173 
174         inode = ufs_new_inode(dir, S_IFDIR|mode);
175         err = PTR_ERR(inode);
176         if (IS_ERR(inode))
177                 goto out_dir;
178 
179         inode->i_op = &ufs_dir_inode_operations;
180         inode->i_fop = &ufs_dir_operations;
181         inode->i_mapping->a_ops = &ufs_aops;
182 
183         inode_inc_link_count(inode);
184 
185         err = ufs_make_empty(inode, dir);
186         if (err)
187                 goto out_fail;
188 
189         err = ufs_add_link(dentry, inode);
190         if (err)
191                 goto out_fail;
192 
193         d_instantiate_new(dentry, inode);
194         return 0;
195 
196 out_fail:
197         inode_dec_link_count(inode);
198         inode_dec_link_count(inode);
199         discard_new_inode(inode);
200 out_dir:
201         inode_dec_link_count(dir);
202         return err;
203 }
204 
205 static int ufs_unlink(struct inode *dir, struct dentry *dentry)
206 {
207         struct inode * inode = d_inode(dentry);
208         struct ufs_dir_entry *de;
209         struct page *page;
210         int err = -ENOENT;
211 
212         de = ufs_find_entry(dir, &dentry->d_name, &page);
213         if (!de)
214                 goto out;
215 
216         err = ufs_delete_entry(dir, de, page);
217         if (err)
218                 goto out;
219 
220         inode->i_ctime = dir->i_ctime;
221         inode_dec_link_count(inode);
222         err = 0;
223 out:
224         return err;
225 }
226 
227 static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
228 {
229         struct inode * inode = d_inode(dentry);
230         int err= -ENOTEMPTY;
231 
232         if (ufs_empty_dir (inode)) {
233                 err = ufs_unlink(dir, dentry);
234                 if (!err) {
235                         inode->i_size = 0;
236                         inode_dec_link_count(inode);
237                         inode_dec_link_count(dir);
238                 }
239         }
240         return err;
241 }
242 
243 static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
244                       struct inode *new_dir, struct dentry *new_dentry,
245                       unsigned int flags)
246 {
247         struct inode *old_inode = d_inode(old_dentry);
248         struct inode *new_inode = d_inode(new_dentry);
249         struct page *dir_page = NULL;
250         struct ufs_dir_entry * dir_de = NULL;
251         struct page *old_page;
252         struct ufs_dir_entry *old_de;
253         int err = -ENOENT;
254 
255         if (flags & ~RENAME_NOREPLACE)
256                 return -EINVAL;
257 
258         old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
259         if (!old_de)
260                 goto out;
261 
262         if (S_ISDIR(old_inode->i_mode)) {
263                 err = -EIO;
264                 dir_de = ufs_dotdot(old_inode, &dir_page);
265                 if (!dir_de)
266                         goto out_old;
267         }
268 
269         if (new_inode) {
270                 struct page *new_page;
271                 struct ufs_dir_entry *new_de;
272 
273                 err = -ENOTEMPTY;
274                 if (dir_de && !ufs_empty_dir(new_inode))
275                         goto out_dir;
276 
277                 err = -ENOENT;
278                 new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
279                 if (!new_de)
280                         goto out_dir;
281                 ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
282                 new_inode->i_ctime = current_time(new_inode);
283                 if (dir_de)
284                         drop_nlink(new_inode);
285                 inode_dec_link_count(new_inode);
286         } else {
287                 err = ufs_add_link(new_dentry, old_inode);
288                 if (err)
289                         goto out_dir;
290                 if (dir_de)
291                         inode_inc_link_count(new_dir);
292         }
293 
294         /*
295          * Like most other Unix systems, set the ctime for inodes on a
296          * rename.
297          */
298         old_inode->i_ctime = current_time(old_inode);
299 
300         ufs_delete_entry(old_dir, old_de, old_page);
301         mark_inode_dirty(old_inode);
302 
303         if (dir_de) {
304                 if (old_dir != new_dir)
305                         ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
306                 else {
307                         kunmap(dir_page);
308                         put_page(dir_page);
309                 }
310                 inode_dec_link_count(old_dir);
311         }
312         return 0;
313 
314 
315 out_dir:
316         if (dir_de) {
317                 kunmap(dir_page);
318                 put_page(dir_page);
319         }
320 out_old:
321         kunmap(old_page);
322         put_page(old_page);
323 out:
324         return err;
325 }
326 
327 const struct inode_operations ufs_dir_inode_operations = {
328         .create         = ufs_create,
329         .lookup         = ufs_lookup,
330         .link           = ufs_link,
331         .unlink         = ufs_unlink,
332         .symlink        = ufs_symlink,
333         .mkdir          = ufs_mkdir,
334         .rmdir          = ufs_rmdir,
335         .mknod          = ufs_mknod,
336         .rename         = ufs_rename,
337 };
338 

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