Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/fs/ext2/namei.c |
| 4 | * |
| 5 | * Rewrite to pagecache. Almost all code had been changed, so blame me |
| 6 | * if the things go wrong. Please, send bug reports to |
| 7 | * viro@parcelfarce.linux.theplanet.co.uk |
| 8 | * |
| 9 | * Stuff here is basically a glue between the VFS and generic UNIXish |
| 10 | * filesystem that keeps everything in pagecache. All knowledge of the |
| 11 | * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable |
| 12 | * and it's easier to debug that way. In principle we might want to |
| 13 | * generalize that a bit and turn it into a library. Or not. |
| 14 | * |
| 15 | * The only non-static object here is ext2_dir_inode_operations. |
| 16 | * |
| 17 | * TODO: get rid of kmap() use, add readahead. |
| 18 | * |
| 19 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 20 | * Remy Card (card@masi.ibp.fr) |
| 21 | * Laboratoire MASI - Institut Blaise Pascal |
| 22 | * Universite Pierre et Marie Curie (Paris VI) |
| 23 | * |
| 24 | * from |
| 25 | * |
| 26 | * linux/fs/minix/namei.c |
| 27 | * |
| 28 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 29 | * |
| 30 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 31 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 32 | */ |
| 33 | |
| 34 | #include <linux/pagemap.h> |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 35 | #include <linux/quotaops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include "ext2.h" |
| 37 | #include "xattr.h" |
| 38 | #include "acl.h" |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode) |
| 41 | { |
| 42 | int err = ext2_add_link(dentry, inode); |
| 43 | if (!err) { |
Al Viro | 1e2e547 | 2018-05-04 08:23:01 -0400 | [diff] [blame] | 44 | d_instantiate_new(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 | 2e5afe5 | 2018-05-16 18:29:56 -0400 | [diff] [blame] | 48 | discard_new_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | return err; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Methods themselves. |
| 54 | */ |
| 55 | |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 56 | 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] | 57 | { |
| 58 | struct inode * inode; |
zhangyi (F) | a43850a | 2020-06-08 11:40:43 +0800 | [diff] [blame] | 59 | ino_t ino; |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 60 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | if (dentry->d_name.len > EXT2_NAME_LEN) |
| 63 | return ERR_PTR(-ENAMETOOLONG); |
| 64 | |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 65 | res = ext2_inode_by_name(dir, &dentry->d_name, &ino); |
zhangyi (F) | a43850a | 2020-06-08 11:40:43 +0800 | [diff] [blame] | 66 | if (res) { |
| 67 | if (res != -ENOENT) |
| 68 | return ERR_PTR(res); |
| 69 | inode = NULL; |
| 70 | } else { |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 71 | inode = ext2_iget(dir->i_sb, ino); |
Al Viro | a904937 | 2011-07-08 21:20:11 -0400 | [diff] [blame] | 72 | if (inode == ERR_PTR(-ESTALE)) { |
| 73 | ext2_error(dir->i_sb, __func__, |
| 74 | "deleted inode referenced: %lu", |
| 75 | (unsigned long) ino); |
| 76 | return ERR_PTR(-EIO); |
Bryan Donlan | 4d6c13f | 2009-06-30 11:41:24 -0700 | [diff] [blame] | 77 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
Pekka Enberg | 082a05c | 2006-01-14 13:21:07 -0800 | [diff] [blame] | 79 | return d_splice_alias(inode, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | struct dentry *ext2_get_parent(struct dentry *child) |
| 83 | { |
zhangyi (F) | a43850a | 2020-06-08 11:40:43 +0800 | [diff] [blame] | 84 | ino_t ino; |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 85 | int res; |
| 86 | |
Al Viro | 80e5d1ff5 | 2021-04-15 19:46:50 -0400 | [diff] [blame] | 87 | res = ext2_inode_by_name(d_inode(child), &dotdot_name, &ino); |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 88 | if (res) |
| 89 | return ERR_PTR(res); |
zhangyi (F) | a43850a | 2020-06-08 11:40:43 +0800 | [diff] [blame] | 90 | |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame] | 91 | return d_obtain_alias(ext2_iget(child->d_sb, ino)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | /* |
| 95 | * By the time this is called, we already have created |
| 96 | * the directory cache entry for the new file, but it |
| 97 | * is so far negative - it has no inode. |
| 98 | * |
| 99 | * If the create succeeds, we fill in the inode information |
| 100 | * with d_instantiate(). |
| 101 | */ |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 102 | static int ext2_create (struct user_namespace * mnt_userns, |
| 103 | struct inode * dir, struct dentry * dentry, |
| 104 | umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 106 | struct inode *inode; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 107 | int err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 108 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 109 | err = dquot_initialize(dir); |
| 110 | if (err) |
| 111 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 112 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 113 | inode = ext2_new_inode(dir, mode, &dentry->d_name); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 114 | if (IS_ERR(inode)) |
| 115 | return PTR_ERR(inode); |
| 116 | |
Dan Williams | fb094c9 | 2017-12-21 12:25:11 -0800 | [diff] [blame] | 117 | ext2_set_file_ops(inode); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 118 | mark_inode_dirty(inode); |
| 119 | return ext2_add_nondir(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 122 | static int ext2_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, |
Miklos Szeredi | 863f144 | 2022-09-24 07:00:00 +0200 | [diff] [blame] | 123 | struct file *file, umode_t mode) |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 124 | { |
| 125 | struct inode *inode = ext2_new_inode(dir, mode, NULL); |
| 126 | if (IS_ERR(inode)) |
| 127 | return PTR_ERR(inode); |
| 128 | |
Dan Williams | fb094c9 | 2017-12-21 12:25:11 -0800 | [diff] [blame] | 129 | ext2_set_file_ops(inode); |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 130 | mark_inode_dirty(inode); |
Miklos Szeredi | 863f144 | 2022-09-24 07:00:00 +0200 | [diff] [blame] | 131 | d_tmpfile(file, inode); |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 132 | unlock_new_inode(inode); |
Miklos Szeredi | 863f144 | 2022-09-24 07:00:00 +0200 | [diff] [blame] | 133 | return finish_open_simple(file, 0); |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 134 | } |
| 135 | |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 136 | static int ext2_mknod (struct user_namespace * mnt_userns, struct inode * dir, |
| 137 | struct dentry *dentry, umode_t mode, dev_t rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
| 139 | struct inode * inode; |
| 140 | int err; |
| 141 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 142 | err = dquot_initialize(dir); |
| 143 | if (err) |
| 144 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 145 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 146 | inode = ext2_new_inode (dir, mode, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | err = PTR_ERR(inode); |
| 148 | if (!IS_ERR(inode)) { |
| 149 | init_special_inode(inode, inode->i_mode, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | inode->i_op = &ext2_special_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | mark_inode_dirty(inode); |
| 152 | err = ext2_add_nondir(dentry, inode); |
| 153 | } |
| 154 | return err; |
| 155 | } |
| 156 | |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 157 | static int ext2_symlink (struct user_namespace * mnt_userns, struct inode * dir, |
| 158 | struct dentry * dentry, const char * symname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
| 160 | struct super_block * sb = dir->i_sb; |
| 161 | int err = -ENAMETOOLONG; |
| 162 | unsigned l = strlen(symname)+1; |
| 163 | struct inode * inode; |
| 164 | |
| 165 | if (l > sb->s_blocksize) |
| 166 | goto out; |
| 167 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 168 | err = dquot_initialize(dir); |
| 169 | if (err) |
| 170 | goto out; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 171 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 172 | inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | err = PTR_ERR(inode); |
| 174 | if (IS_ERR(inode)) |
| 175 | goto out; |
| 176 | |
| 177 | if (l > sizeof (EXT2_I(inode)->i_data)) { |
| 178 | /* slow symlink */ |
| 179 | inode->i_op = &ext2_symlink_inode_operations; |
Al Viro | 21fc61c | 2015-11-17 01:07:57 -0500 | [diff] [blame] | 180 | inode_nohighmem(inode); |
Christoph Hellwig | 0cc5b4c | 2022-06-13 07:37:11 +0200 | [diff] [blame] | 181 | inode->i_mapping->a_ops = &ext2_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | err = page_symlink(inode, symname, l); |
| 183 | if (err) |
| 184 | goto out_fail; |
| 185 | } else { |
| 186 | /* fast symlink */ |
| 187 | inode->i_op = &ext2_fast_symlink_inode_operations; |
Al Viro | cbe0fa3 | 2015-05-02 10:02:46 -0400 | [diff] [blame] | 188 | inode->i_link = (char*)EXT2_I(inode)->i_data; |
| 189 | memcpy(inode->i_link, symname, l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | inode->i_size = l-1; |
| 191 | } |
| 192 | mark_inode_dirty(inode); |
| 193 | |
| 194 | err = ext2_add_nondir(dentry, inode); |
| 195 | out: |
| 196 | return err; |
| 197 | |
| 198 | out_fail: |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 199 | inode_dec_link_count(inode); |
Al Viro | 2e5afe5 | 2018-05-16 18:29:56 -0400 | [diff] [blame] | 200 | discard_new_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | goto out; |
| 202 | } |
| 203 | |
| 204 | static int ext2_link (struct dentry * old_dentry, struct inode * dir, |
| 205 | struct dentry *dentry) |
| 206 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 207 | struct inode *inode = d_inode(old_dentry); |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 208 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 210 | err = dquot_initialize(dir); |
| 211 | if (err) |
| 212 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 213 | |
Deepa Dinamani | 02027d4 | 2016-09-14 07:48:05 -0700 | [diff] [blame] | 214 | inode->i_ctime = current_time(inode); |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 215 | inode_inc_link_count(inode); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 216 | ihold(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Al Viro | 41080b5 | 2008-12-30 01:52:35 -0500 | [diff] [blame] | 218 | err = ext2_add_link(dentry, inode); |
| 219 | if (!err) { |
| 220 | d_instantiate(dentry, inode); |
| 221 | return 0; |
| 222 | } |
| 223 | inode_dec_link_count(inode); |
| 224 | iput(inode); |
| 225 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 228 | static int ext2_mkdir(struct user_namespace * mnt_userns, |
| 229 | struct inode * dir, struct dentry * dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
| 231 | struct inode * inode; |
Al Viro | 8de5277 | 2012-02-06 12:45:27 -0500 | [diff] [blame] | 232 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 234 | err = dquot_initialize(dir); |
| 235 | if (err) |
| 236 | return err; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 237 | |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 238 | inode_inc_link_count(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 240 | inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | err = PTR_ERR(inode); |
| 242 | if (IS_ERR(inode)) |
| 243 | goto out_dir; |
| 244 | |
| 245 | inode->i_op = &ext2_dir_inode_operations; |
| 246 | inode->i_fop = &ext2_dir_operations; |
Christoph Hellwig | 0cc5b4c | 2022-06-13 07:37:11 +0200 | [diff] [blame] | 247 | inode->i_mapping->a_ops = &ext2_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 249 | inode_inc_link_count(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | err = ext2_make_empty(inode, dir); |
| 252 | if (err) |
| 253 | goto out_fail; |
| 254 | |
| 255 | err = ext2_add_link(dentry, inode); |
| 256 | if (err) |
| 257 | goto out_fail; |
| 258 | |
Al Viro | 1e2e547 | 2018-05-04 08:23:01 -0400 | [diff] [blame] | 259 | d_instantiate_new(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | out: |
| 261 | return err; |
| 262 | |
| 263 | out_fail: |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 264 | inode_dec_link_count(inode); |
| 265 | inode_dec_link_count(inode); |
Al Viro | 2e5afe5 | 2018-05-16 18:29:56 -0400 | [diff] [blame] | 266 | discard_new_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | out_dir: |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 268 | inode_dec_link_count(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | goto out; |
| 270 | } |
| 271 | |
| 272 | static int ext2_unlink(struct inode * dir, struct dentry *dentry) |
| 273 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 274 | struct inode * inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | struct ext2_dir_entry_2 * de; |
| 276 | struct page * page; |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 277 | void *page_addr; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 278 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 280 | err = dquot_initialize(dir); |
| 281 | if (err) |
| 282 | goto out; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 283 | |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 284 | de = ext2_find_entry(dir, &dentry->d_name, &page, &page_addr); |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 285 | if (IS_ERR(de)) { |
| 286 | err = PTR_ERR(de); |
| 287 | goto out; |
| 288 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Javier Pello | 728d392 | 2021-07-14 18:54:48 +0200 | [diff] [blame] | 290 | err = ext2_delete_entry (de, page, page_addr); |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 291 | ext2_put_page(page, page_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (err) |
| 293 | goto out; |
| 294 | |
| 295 | inode->i_ctime = dir->i_ctime; |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 296 | inode_dec_link_count(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | err = 0; |
| 298 | out: |
| 299 | return err; |
| 300 | } |
| 301 | |
| 302 | static int ext2_rmdir (struct inode * dir, struct dentry *dentry) |
| 303 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 304 | struct inode * inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | int err = -ENOTEMPTY; |
| 306 | |
| 307 | if (ext2_empty_dir(inode)) { |
| 308 | err = ext2_unlink(dir, dentry); |
| 309 | if (!err) { |
| 310 | inode->i_size = 0; |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 311 | inode_dec_link_count(inode); |
| 312 | inode_dec_link_count(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | } |
| 314 | } |
| 315 | return err; |
| 316 | } |
| 317 | |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 318 | static int ext2_rename (struct user_namespace * mnt_userns, |
| 319 | struct inode * old_dir, struct dentry * old_dentry, |
| 320 | struct inode * new_dir, struct dentry * new_dentry, |
Miklos Szeredi | f03b8ad | 2016-09-27 11:03:57 +0200 | [diff] [blame] | 321 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 323 | struct inode * old_inode = d_inode(old_dentry); |
| 324 | struct inode * new_inode = d_inode(new_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | struct page * dir_page = NULL; |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 326 | void *dir_page_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | struct ext2_dir_entry_2 * dir_de = NULL; |
| 328 | struct page * old_page; |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 329 | void *old_page_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | struct ext2_dir_entry_2 * old_de; |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 331 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Miklos Szeredi | f03b8ad | 2016-09-27 11:03:57 +0200 | [diff] [blame] | 333 | if (flags & ~RENAME_NOREPLACE) |
| 334 | return -EINVAL; |
| 335 | |
Jan Kara | c2edb30 | 2015-06-29 16:08:45 +0200 | [diff] [blame] | 336 | err = dquot_initialize(old_dir); |
| 337 | if (err) |
| 338 | goto out; |
| 339 | |
| 340 | err = dquot_initialize(new_dir); |
| 341 | if (err) |
| 342 | goto out; |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 343 | |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 344 | old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_page, |
| 345 | &old_page_addr); |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 346 | if (IS_ERR(old_de)) { |
| 347 | err = PTR_ERR(old_de); |
| 348 | goto out; |
| 349 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | if (S_ISDIR(old_inode->i_mode)) { |
| 352 | err = -EIO; |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 353 | dir_de = ext2_dotdot(old_inode, &dir_page, &dir_page_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | if (!dir_de) |
| 355 | goto out_old; |
| 356 | } |
| 357 | |
| 358 | if (new_inode) { |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 359 | void *page_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | struct page *new_page; |
| 361 | struct ext2_dir_entry_2 *new_de; |
| 362 | |
| 363 | err = -ENOTEMPTY; |
| 364 | if (dir_de && !ext2_empty_dir (new_inode)) |
| 365 | goto out_dir; |
| 366 | |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 367 | new_de = ext2_find_entry(new_dir, &new_dentry->d_name, |
| 368 | &new_page, &page_addr); |
zhangyi (F) | b496209 | 2020-06-08 11:40:42 +0800 | [diff] [blame] | 369 | if (IS_ERR(new_de)) { |
| 370 | err = PTR_ERR(new_de); |
| 371 | goto out_dir; |
| 372 | } |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 373 | ext2_set_link(new_dir, new_de, new_page, page_addr, old_inode, 1); |
| 374 | ext2_put_page(new_page, page_addr); |
Deepa Dinamani | 02027d4 | 2016-09-14 07:48:05 -0700 | [diff] [blame] | 375 | new_inode->i_ctime = current_time(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Deepa Dinamani | 02027d4 | 2016-09-14 07:48:05 -0700 | [diff] [blame] | 391 | old_inode->i_ctime = current_time(old_inode); |
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 | |
Javier Pello | 728d392 | 2021-07-14 18:54:48 +0200 | [diff] [blame] | 394 | ext2_delete_entry(old_de, old_page, old_page_addr); |
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) |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 398 | ext2_set_link(old_inode, dir_de, dir_page, |
| 399 | dir_page_addr, new_dir, 0); |
Ira Weiny | e2ebb12 | 2021-03-28 23:54:01 -0700 | [diff] [blame] | 400 | |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 401 | ext2_put_page(dir_page, dir_page_addr); |
Alexey Dobriyan | a513b03 | 2006-03-23 03:00:53 -0800 | [diff] [blame] | 402 | inode_dec_link_count(old_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 405 | ext2_put_page(old_page, old_page_addr); |
| 406 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | out_dir: |
Ira Weiny | a6fbd0a | 2020-11-12 09:42:44 -0800 | [diff] [blame] | 409 | if (dir_de) |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 410 | ext2_put_page(dir_page, dir_page_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | out_old: |
Ira Weiny | 782b76d | 2021-03-28 23:54:02 -0700 | [diff] [blame] | 412 | ext2_put_page(old_page, old_page_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | out: |
| 414 | return err; |
| 415 | } |
| 416 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 417 | const struct inode_operations ext2_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | .create = ext2_create, |
| 419 | .lookup = ext2_lookup, |
| 420 | .link = ext2_link, |
| 421 | .unlink = ext2_unlink, |
| 422 | .symlink = ext2_symlink, |
| 423 | .mkdir = ext2_mkdir, |
| 424 | .rmdir = ext2_rmdir, |
| 425 | .mknod = ext2_mknod, |
| 426 | .rename = ext2_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | .listxattr = ext2_listxattr, |
yangerkun | 93bc420 | 2019-02-18 09:07:02 +0800 | [diff] [blame] | 428 | .getattr = ext2_getattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | .setattr = ext2_setattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 430 | .get_acl = ext2_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 431 | .set_acl = ext2_set_acl, |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 432 | .tmpfile = ext2_tmpfile, |
Miklos Szeredi | aba405e | 2021-04-07 14:36:43 +0200 | [diff] [blame] | 433 | .fileattr_get = ext2_fileattr_get, |
| 434 | .fileattr_set = ext2_fileattr_set, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | }; |
| 436 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 437 | const struct inode_operations ext2_special_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | .listxattr = ext2_listxattr, |
yangerkun | 93bc420 | 2019-02-18 09:07:02 +0800 | [diff] [blame] | 439 | .getattr = ext2_getattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | .setattr = ext2_setattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 441 | .get_acl = ext2_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 442 | .set_acl = ext2_set_acl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | }; |