Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext2/namei.c |
| 3 | * |
| 4 | * Rewrite to pagecache. Almost all code had been changed, so blame me |
| 5 | * if the things go wrong. Please, send bug reports to |
| 6 | * viro@parcelfarce.linux.theplanet.co.uk |
| 7 | * |
| 8 | * Stuff here is basically a glue between the VFS and generic UNIXish |
| 9 | * filesystem that keeps everything in pagecache. All knowledge of the |
| 10 | * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable |
| 11 | * and it's easier to debug that way. In principle we might want to |
| 12 | * generalize that a bit and turn it into a library. Or not. |
| 13 | * |
| 14 | * The only non-static object here is ext2_dir_inode_operations. |
| 15 | * |
| 16 | * TODO: get rid of kmap() use, add readahead. |
| 17 | * |
| 18 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 19 | * Remy Card (card@masi.ibp.fr) |
| 20 | * Laboratoire MASI - Institut Blaise Pascal |
| 21 | * Universite Pierre et Marie Curie (Paris VI) |
| 22 | * |
| 23 | * from |
| 24 | * |
| 25 | * linux/fs/minix/namei.c |
| 26 | * |
| 27 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 28 | * |
| 29 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 30 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 31 | */ |
| 32 | |
| 33 | #include <linux/pagemap.h> |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 34 | #include <linux/quotaops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "ext2.h" |
| 36 | #include "xattr.h" |
| 37 | #include "acl.h" |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode) |
| 40 | { |
| 41 | int err = ext2_add_link(dentry, inode); |
| 42 | if (!err) { |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 43 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 44 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | return 0; |
| 46 | } |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 47 | inode_dec_link_count(inode); |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 48 | unlock_new_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | iput(inode); |
| 50 | return err; |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * Methods themselves. |
| 55 | */ |
| 56 | |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 57 | static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | { |
| 59 | struct inode * inode; |
| 60 | ino_t ino; |
| 61 | |
| 62 | if (dentry->d_name.len > EXT2_NAME_LEN) |
| 63 | return ERR_PTR(-ENAMETOOLONG); |
| 64 | |
Al Viro | a988544 | 2008-08-24 07:28:39 -0400 | [diff] [blame] | 65 | ino = ext2_inode_by_name(dir, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | inode = NULL; |
| 67 | if (ino) { |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 68 | inode = ext2_iget(dir->i_sb, ino); |
Al Viro | a904937 | 2011-07-08 21:20:11 -0400 | [diff] [blame] | 69 | if (inode == ERR_PTR(-ESTALE)) { |
| 70 | ext2_error(dir->i_sb, __func__, |
| 71 | "deleted inode referenced: %lu", |
| 72 | (unsigned long) ino); |
| 73 | return ERR_PTR(-EIO); |
Bryan Donlan | 4d6c13f | 2009-06-30 11:41:24 -0700 | [diff] [blame] | 74 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
Pekka Enberg | 082a05c | 2006-01-14 13:21:07 -0800 | [diff] [blame] | 76 | return d_splice_alias(inode, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | struct dentry *ext2_get_parent(struct dentry *child) |
| 80 | { |
Linus Torvalds | 26fe575 | 2012-05-10 13:14:12 -0700 | [diff] [blame] | 81 | struct qstr dotdot = QSTR_INIT("..", 2); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 82 | unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | if (!ino) |
| 84 | return ERR_PTR(-ENOENT); |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame^] | 85 | return d_obtain_alias(ext2_iget(child->d_sb, ino)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | /* |
| 89 | * By the time this is called, we already have created |
| 90 | * the directory cache entry for the new file, but it |
| 91 | * is so far negative - it has no inode. |
| 92 | * |
| 93 | * If the create succeeds, we fill in the inode information |
| 94 | * with d_instantiate(). |
| 95 | */ |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 96 | static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 98 | struct inode *inode; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 99 | int err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 100 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 101 | err = dquot_initialize(dir); |
| 102 | if (err) |
| 103 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 104 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 105 | inode = ext2_new_inode(dir, mode, &dentry->d_name); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 106 | if (IS_ERR(inode)) |
| 107 | return PTR_ERR(inode); |
| 108 | |
| 109 | inode->i_op = &ext2_file_inode_operations; |
Boaz Harrosh | be64f88 | 2015-04-15 16:15:17 -0700 | [diff] [blame] | 110 | if (test_opt(inode->i_sb, NOBH)) { |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 111 | inode->i_mapping->a_ops = &ext2_nobh_aops; |
| 112 | inode->i_fop = &ext2_file_operations; |
| 113 | } else { |
| 114 | inode->i_mapping->a_ops = &ext2_aops; |
| 115 | inode->i_fop = &ext2_file_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 117 | mark_inode_dirty(inode); |
| 118 | return ext2_add_nondir(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 121 | static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 122 | { |
| 123 | struct inode *inode = ext2_new_inode(dir, mode, NULL); |
| 124 | if (IS_ERR(inode)) |
| 125 | return PTR_ERR(inode); |
| 126 | |
| 127 | inode->i_op = &ext2_file_inode_operations; |
Boaz Harrosh | be64f88 | 2015-04-15 16:15:17 -0700 | [diff] [blame] | 128 | if (test_opt(inode->i_sb, NOBH)) { |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 129 | inode->i_mapping->a_ops = &ext2_nobh_aops; |
| 130 | inode->i_fop = &ext2_file_operations; |
| 131 | } else { |
| 132 | inode->i_mapping->a_ops = &ext2_aops; |
| 133 | inode->i_fop = &ext2_file_operations; |
| 134 | } |
| 135 | mark_inode_dirty(inode); |
| 136 | d_tmpfile(dentry, inode); |
| 137 | unlock_new_inode(inode); |
| 138 | return 0; |
| 139 | } |
| 140 | |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 141 | static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
| 143 | struct inode * inode; |
| 144 | int err; |
| 145 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 146 | err = dquot_initialize(dir); |
| 147 | if (err) |
| 148 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 149 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 150 | inode = ext2_new_inode (dir, mode, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | err = PTR_ERR(inode); |
| 152 | if (!IS_ERR(inode)) { |
| 153 | init_special_inode(inode, inode->i_mode, rdev); |
| 154 | #ifdef CONFIG_EXT2_FS_XATTR |
| 155 | inode->i_op = &ext2_special_inode_operations; |
| 156 | #endif |
| 157 | mark_inode_dirty(inode); |
| 158 | err = ext2_add_nondir(dentry, inode); |
| 159 | } |
| 160 | return err; |
| 161 | } |
| 162 | |
| 163 | static int ext2_symlink (struct inode * dir, struct dentry * dentry, |
| 164 | const char * symname) |
| 165 | { |
| 166 | struct super_block * sb = dir->i_sb; |
| 167 | int err = -ENAMETOOLONG; |
| 168 | unsigned l = strlen(symname)+1; |
| 169 | struct inode * inode; |
| 170 | |
| 171 | if (l > sb->s_blocksize) |
| 172 | goto out; |
| 173 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 174 | err = dquot_initialize(dir); |
| 175 | if (err) |
| 176 | goto out; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 177 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 178 | inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | err = PTR_ERR(inode); |
| 180 | if (IS_ERR(inode)) |
| 181 | goto out; |
| 182 | |
| 183 | if (l > sizeof (EXT2_I(inode)->i_data)) { |
| 184 | /* slow symlink */ |
| 185 | inode->i_op = &ext2_symlink_inode_operations; |
Al Viro | 21fc61c | 2015-11-17 01:07:57 -0500 | [diff] [blame] | 186 | inode_nohighmem(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | if (test_opt(inode->i_sb, NOBH)) |
| 188 | inode->i_mapping->a_ops = &ext2_nobh_aops; |
| 189 | else |
| 190 | inode->i_mapping->a_ops = &ext2_aops; |
| 191 | err = page_symlink(inode, symname, l); |
| 192 | if (err) |
| 193 | goto out_fail; |
| 194 | } else { |
| 195 | /* fast symlink */ |
| 196 | inode->i_op = &ext2_fast_symlink_inode_operations; |
Al Viro | cbe0fa3 | 2015-05-02 10:02:46 -0400 | [diff] [blame] | 197 | inode->i_link = (char*)EXT2_I(inode)->i_data; |
| 198 | memcpy(inode->i_link, symname, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | inode->i_size = l-1; |
| 200 | } |
| 201 | mark_inode_dirty(inode); |
| 202 | |
| 203 | err = ext2_add_nondir(dentry, inode); |
| 204 | out: |
| 205 | return err; |
| 206 | |
| 207 | out_fail: |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 208 | inode_dec_link_count(inode); |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 209 | unlock_new_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | iput (inode); |
| 211 | goto out; |
| 212 | } |
| 213 | |
| 214 | static int ext2_link (struct dentry * old_dentry, struct inode * dir, |
| 215 | struct dentry *dentry) |
| 216 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 217 | struct inode *inode = d_inode(old_dentry); |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 218 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 220 | err = dquot_initialize(dir); |
| 221 | if (err) |
| 222 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | inode->i_ctime = CURRENT_TIME_SEC; |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 225 | inode_inc_link_count(inode); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 226 | ihold(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 228 | err = ext2_add_link(dentry, inode); |
| 229 | if (!err) { |
| 230 | d_instantiate(dentry, inode); |
| 231 | return 0; |
| 232 | } |
| 233 | inode_dec_link_count(inode); |
| 234 | iput(inode); |
| 235 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 238 | static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | { |
| 240 | struct inode * inode; |
Al Viro | 8de5277 | 2012-02-06 12:45:27 -0500 | [diff] [blame] | 241 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 243 | err = dquot_initialize(dir); |
| 244 | if (err) |
| 245 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 246 | |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 247 | inode_inc_link_count(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 249 | inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | err = PTR_ERR(inode); |
| 251 | if (IS_ERR(inode)) |
| 252 | goto out_dir; |
| 253 | |
| 254 | inode->i_op = &ext2_dir_inode_operations; |
| 255 | inode->i_fop = &ext2_dir_operations; |
| 256 | if (test_opt(inode->i_sb, NOBH)) |
| 257 | inode->i_mapping->a_ops = &ext2_nobh_aops; |
| 258 | else |
| 259 | inode->i_mapping->a_ops = &ext2_aops; |
| 260 | |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 261 | inode_inc_link_count(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | err = ext2_make_empty(inode, dir); |
| 264 | if (err) |
| 265 | goto out_fail; |
| 266 | |
| 267 | err = ext2_add_link(dentry, inode); |
| 268 | if (err) |
| 269 | goto out_fail; |
| 270 | |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 271 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 272 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | out: |
| 274 | return err; |
| 275 | |
| 276 | out_fail: |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 277 | inode_dec_link_count(inode); |
| 278 | inode_dec_link_count(inode); |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 279 | unlock_new_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | iput(inode); |
| 281 | out_dir: |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 282 | inode_dec_link_count(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | goto out; |
| 284 | } |
| 285 | |
| 286 | static int ext2_unlink(struct inode * dir, struct dentry *dentry) |
| 287 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 288 | struct inode * inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | struct ext2_dir_entry_2 * de; |
| 290 | struct page * page; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 291 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 293 | err = dquot_initialize(dir); |
| 294 | if (err) |
| 295 | goto out; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 296 | |
Al Viro | a988544 | 2008-08-24 07:28:39 -0400 | [diff] [blame] | 297 | de = ext2_find_entry (dir, &dentry->d_name, &page); |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 298 | if (!de) { |
| 299 | err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | goto out; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 301 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
| 303 | err = ext2_delete_entry (de, page); |
| 304 | if (err) |
| 305 | goto out; |
| 306 | |
| 307 | inode->i_ctime = dir->i_ctime; |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 308 | inode_dec_link_count(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | err = 0; |
| 310 | out: |
| 311 | return err; |
| 312 | } |
| 313 | |
| 314 | static int ext2_rmdir (struct inode * dir, struct dentry *dentry) |
| 315 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 316 | struct inode * inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | int err = -ENOTEMPTY; |
| 318 | |
| 319 | if (ext2_empty_dir(inode)) { |
| 320 | err = ext2_unlink(dir, dentry); |
| 321 | if (!err) { |
| 322 | inode->i_size = 0; |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 323 | inode_dec_link_count(inode); |
| 324 | inode_dec_link_count(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | } |
| 327 | return err; |
| 328 | } |
| 329 | |
| 330 | static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry, |
| 331 | struct inode * new_dir, struct dentry * new_dentry ) |
| 332 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 333 | struct inode * old_inode = d_inode(old_dentry); |
| 334 | struct inode * new_inode = d_inode(new_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | struct page * dir_page = NULL; |
| 336 | struct ext2_dir_entry_2 * dir_de = NULL; |
| 337 | struct page * old_page; |
| 338 | struct ext2_dir_entry_2 * old_de; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 339 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 341 | err = dquot_initialize(old_dir); |
| 342 | if (err) |
| 343 | goto out; |
| 344 | |
| 345 | err = dquot_initialize(new_dir); |
| 346 | if (err) |
| 347 | goto out; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 348 | |
Al Viro | a988544 | 2008-08-24 07:28:39 -0400 | [diff] [blame] | 349 | old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page); |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 350 | if (!old_de) { |
| 351 | err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | goto out; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
| 355 | if (S_ISDIR(old_inode->i_mode)) { |
| 356 | err = -EIO; |
| 357 | dir_de = ext2_dotdot(old_inode, &dir_page); |
| 358 | if (!dir_de) |
| 359 | goto out_old; |
| 360 | } |
| 361 | |
| 362 | if (new_inode) { |
| 363 | struct page *new_page; |
| 364 | struct ext2_dir_entry_2 *new_de; |
| 365 | |
| 366 | err = -ENOTEMPTY; |
| 367 | if (dir_de && !ext2_empty_dir (new_inode)) |
| 368 | goto out_dir; |
| 369 | |
| 370 | err = -ENOENT; |
Al Viro | a988544 | 2008-08-24 07:28:39 -0400 | [diff] [blame] | 371 | new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | if (!new_de) |
| 373 | goto out_dir; |
Jan Kara | 39fe755 | 2009-06-17 16:26:20 -0700 | [diff] [blame] | 374 | ext2_set_link(new_dir, new_de, new_page, old_inode, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | new_inode->i_ctime = CURRENT_TIME_SEC; |
| 376 | if (dir_de) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 377 | drop_nlink(new_inode); |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 378 | inode_dec_link_count(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | err = ext2_add_link(new_dentry, old_inode); |
Josh Hunt | e8a80c6 | 2011-02-24 11:48:22 +0100 | [diff] [blame] | 381 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | goto out_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (dir_de) |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 384 | inode_inc_link_count(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Like most other Unix systems, set the ctime for inodes on a |
| 389 | * rename. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | */ |
| 391 | old_inode->i_ctime = CURRENT_TIME_SEC; |
Josh Hunt | e8a80c6 | 2011-02-24 11:48:22 +0100 | [diff] [blame] | 392 | mark_inode_dirty(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | ext2_delete_entry (old_de, old_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | if (dir_de) { |
Jan Kara | 39fe755 | 2009-06-17 16:26:20 -0700 | [diff] [blame] | 397 | if (old_dir != new_dir) |
| 398 | ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0); |
Nicolas Pitre | 9de6886 | 2009-09-05 00:25:37 -0400 | [diff] [blame] | 399 | else { |
| 400 | kunmap(dir_page); |
| 401 | page_cache_release(dir_page); |
| 402 | } |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 403 | inode_dec_link_count(old_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
| 405 | return 0; |
| 406 | |
| 407 | |
| 408 | out_dir: |
| 409 | if (dir_de) { |
| 410 | kunmap(dir_page); |
| 411 | page_cache_release(dir_page); |
| 412 | } |
| 413 | out_old: |
| 414 | kunmap(old_page); |
| 415 | page_cache_release(old_page); |
| 416 | out: |
| 417 | return err; |
| 418 | } |
| 419 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 420 | const struct inode_operations ext2_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | .create = ext2_create, |
| 422 | .lookup = ext2_lookup, |
| 423 | .link = ext2_link, |
| 424 | .unlink = ext2_unlink, |
| 425 | .symlink = ext2_symlink, |
| 426 | .mkdir = ext2_mkdir, |
| 427 | .rmdir = ext2_rmdir, |
| 428 | .mknod = ext2_mknod, |
| 429 | .rename = ext2_rename, |
| 430 | #ifdef CONFIG_EXT2_FS_XATTR |
| 431 | .setxattr = generic_setxattr, |
| 432 | .getxattr = generic_getxattr, |
| 433 | .listxattr = ext2_listxattr, |
| 434 | .removexattr = generic_removexattr, |
| 435 | #endif |
| 436 | .setattr = ext2_setattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 437 | .get_acl = ext2_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 438 | .set_acl = ext2_set_acl, |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 439 | .tmpfile = ext2_tmpfile, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | }; |
| 441 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 442 | const struct inode_operations ext2_special_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | #ifdef CONFIG_EXT2_FS_XATTR |
| 444 | .setxattr = generic_setxattr, |
| 445 | .getxattr = generic_getxattr, |
| 446 | .listxattr = ext2_listxattr, |
| 447 | .removexattr = generic_removexattr, |
| 448 | #endif |
| 449 | .setattr = ext2_setattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 450 | .get_acl = ext2_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 451 | .set_acl = ext2_set_acl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | }; |