Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/sdcardfs/inode.c |
| 3 | * |
| 4 | * Copyright (c) 2013 Samsung Electronics Co. Ltd |
| 5 | * Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun, |
| 6 | * Sunghwan Yun, Sungjong Seo |
| 7 | * |
| 8 | * This program has been developed as a stackable file system based on |
| 9 | * the WrapFS which written by |
| 10 | * |
| 11 | * Copyright (c) 1998-2011 Erez Zadok |
| 12 | * Copyright (c) 2009 Shrikar Archak |
| 13 | * Copyright (c) 2003-2011 Stony Brook University |
| 14 | * Copyright (c) 2003-2011 The Research Foundation of SUNY |
| 15 | * |
| 16 | * This file is dual licensed. It may be redistributed and/or modified |
| 17 | * under the terms of the Apache 2.0 License OR version 2 of the GNU |
| 18 | * General Public License. |
| 19 | */ |
| 20 | |
| 21 | #include "sdcardfs.h" |
| 22 | |
| 23 | /* Do not directly use this function. Use OVERRIDE_CRED() instead. */ |
| 24 | const struct cred * override_fsids(struct sdcardfs_sb_info* sbi) |
| 25 | { |
| 26 | struct cred * cred; |
| 27 | const struct cred * old_cred; |
| 28 | |
| 29 | cred = prepare_creds(); |
| 30 | if (!cred) |
| 31 | return NULL; |
| 32 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 33 | cred->fsuid = make_kuid(&init_user_ns, sbi->options.fs_low_uid); |
| 34 | cred->fsgid = make_kgid(&init_user_ns, sbi->options.fs_low_gid); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 35 | |
| 36 | old_cred = override_creds(cred); |
| 37 | |
| 38 | return old_cred; |
| 39 | } |
| 40 | |
| 41 | /* Do not directly use this function, use REVERT_CRED() instead. */ |
| 42 | void revert_fsids(const struct cred * old_cred) |
| 43 | { |
| 44 | const struct cred * cur_cred; |
| 45 | |
| 46 | cur_cred = current->cred; |
| 47 | revert_creds(old_cred); |
| 48 | put_cred(cur_cred); |
| 49 | } |
| 50 | |
| 51 | static int sdcardfs_create(struct inode *dir, struct dentry *dentry, |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 52 | umode_t mode, bool want_excl) |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 53 | { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 54 | int err; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 55 | struct dentry *lower_dentry; |
| 56 | struct dentry *lower_parent_dentry = NULL; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 57 | struct path lower_path; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 58 | const struct cred *saved_cred = NULL; |
| 59 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 60 | if(!check_caller_access_to_name(dir, dentry->d_name.name)) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 61 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 62 | " dentry: %s, task:%s\n", |
| 63 | __func__, dentry->d_name.name, current->comm); |
| 64 | err = -EACCES; |
| 65 | goto out_eacces; |
| 66 | } |
| 67 | |
| 68 | /* save current_cred and override it */ |
| 69 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb), saved_cred); |
| 70 | |
| 71 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 72 | lower_dentry = lower_path.dentry; |
| 73 | lower_parent_dentry = lock_parent(lower_dentry); |
| 74 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 75 | /* set last 16bytes of mode field to 0664 */ |
| 76 | mode = (mode & S_IFMT) | 00664; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 77 | err = vfs_create(d_inode(lower_parent_dentry), lower_dentry, mode, want_excl); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 78 | if (err) |
| 79 | goto out; |
| 80 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 81 | err = sdcardfs_interpose(dentry, dir->i_sb, &lower_path, SDCARDFS_I(dir)->userid); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 82 | if (err) |
| 83 | goto out; |
| 84 | fsstack_copy_attr_times(dir, sdcardfs_lower_inode(dir)); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 85 | fsstack_copy_inode_size(dir, d_inode(lower_parent_dentry)); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 86 | |
| 87 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 88 | unlock_dir(lower_parent_dentry); |
| 89 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 90 | REVERT_CRED(saved_cred); |
| 91 | out_eacces: |
| 92 | return err; |
| 93 | } |
| 94 | |
| 95 | #if 0 |
| 96 | static int sdcardfs_link(struct dentry *old_dentry, struct inode *dir, |
| 97 | struct dentry *new_dentry) |
| 98 | { |
| 99 | struct dentry *lower_old_dentry; |
| 100 | struct dentry *lower_new_dentry; |
| 101 | struct dentry *lower_dir_dentry; |
| 102 | u64 file_size_save; |
| 103 | int err; |
| 104 | struct path lower_old_path, lower_new_path; |
| 105 | |
| 106 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb)); |
| 107 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 108 | file_size_save = i_size_read(d_inode(old_dentry)); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 109 | sdcardfs_get_lower_path(old_dentry, &lower_old_path); |
| 110 | sdcardfs_get_lower_path(new_dentry, &lower_new_path); |
| 111 | lower_old_dentry = lower_old_path.dentry; |
| 112 | lower_new_dentry = lower_new_path.dentry; |
| 113 | lower_dir_dentry = lock_parent(lower_new_dentry); |
| 114 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 115 | err = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
| 116 | lower_new_dentry, NULL); |
| 117 | if (err || !d_inode(lower_new_dentry)) |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 118 | goto out; |
| 119 | |
| 120 | err = sdcardfs_interpose(new_dentry, dir->i_sb, &lower_new_path); |
| 121 | if (err) |
| 122 | goto out; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 123 | fsstack_copy_attr_times(dir, d_inode(lower_new_dentry)); |
| 124 | fsstack_copy_inode_size(dir, d_inode(lower_new_dentry)); |
| 125 | set_nlink(d_inode(old_dentry), |
| 126 | sdcardfs_lower_inode(d_inode(old_dentry))->i_nlink); |
| 127 | i_size_write(d_inode(new_dentry), file_size_save); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 128 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 129 | unlock_dir(lower_dir_dentry); |
| 130 | sdcardfs_put_lower_path(old_dentry, &lower_old_path); |
| 131 | sdcardfs_put_lower_path(new_dentry, &lower_new_path); |
| 132 | REVERT_CRED(); |
| 133 | return err; |
| 134 | } |
| 135 | #endif |
| 136 | |
| 137 | static int sdcardfs_unlink(struct inode *dir, struct dentry *dentry) |
| 138 | { |
| 139 | int err; |
| 140 | struct dentry *lower_dentry; |
| 141 | struct inode *lower_dir_inode = sdcardfs_lower_inode(dir); |
| 142 | struct dentry *lower_dir_dentry; |
| 143 | struct path lower_path; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 144 | const struct cred *saved_cred = NULL; |
| 145 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 146 | if(!check_caller_access_to_name(dir, dentry->d_name.name)) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 147 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 148 | " dentry: %s, task:%s\n", |
| 149 | __func__, dentry->d_name.name, current->comm); |
| 150 | err = -EACCES; |
| 151 | goto out_eacces; |
| 152 | } |
| 153 | |
| 154 | /* save current_cred and override it */ |
| 155 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb), saved_cred); |
| 156 | |
| 157 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 158 | lower_dentry = lower_path.dentry; |
| 159 | dget(lower_dentry); |
| 160 | lower_dir_dentry = lock_parent(lower_dentry); |
| 161 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 162 | err = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 163 | |
| 164 | /* |
| 165 | * Note: unlinking on top of NFS can cause silly-renamed files. |
| 166 | * Trying to delete such files results in EBUSY from NFS |
| 167 | * below. Silly-renamed files will get deleted by NFS later on, so |
| 168 | * we just need to detect them here and treat such EBUSY errors as |
| 169 | * if the upper file was successfully deleted. |
| 170 | */ |
| 171 | if (err == -EBUSY && lower_dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 172 | err = 0; |
| 173 | if (err) |
| 174 | goto out; |
| 175 | fsstack_copy_attr_times(dir, lower_dir_inode); |
| 176 | fsstack_copy_inode_size(dir, lower_dir_inode); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 177 | set_nlink(d_inode(dentry), |
| 178 | sdcardfs_lower_inode(d_inode(dentry))->i_nlink); |
| 179 | d_inode(dentry)->i_ctime = dir->i_ctime; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 180 | d_drop(dentry); /* this is needed, else LTP fails (VFS won't do it) */ |
| 181 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 182 | unlock_dir(lower_dir_dentry); |
| 183 | dput(lower_dentry); |
| 184 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 185 | REVERT_CRED(saved_cred); |
| 186 | out_eacces: |
| 187 | return err; |
| 188 | } |
| 189 | |
| 190 | #if 0 |
| 191 | static int sdcardfs_symlink(struct inode *dir, struct dentry *dentry, |
| 192 | const char *symname) |
| 193 | { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 194 | int err; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 195 | struct dentry *lower_dentry; |
| 196 | struct dentry *lower_parent_dentry = NULL; |
| 197 | struct path lower_path; |
| 198 | |
| 199 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb)); |
| 200 | |
| 201 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 202 | lower_dentry = lower_path.dentry; |
| 203 | lower_parent_dentry = lock_parent(lower_dentry); |
| 204 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 205 | err = vfs_symlink(d_inode(lower_parent_dentry), lower_dentry, symname); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 206 | if (err) |
| 207 | goto out; |
| 208 | err = sdcardfs_interpose(dentry, dir->i_sb, &lower_path); |
| 209 | if (err) |
| 210 | goto out; |
| 211 | fsstack_copy_attr_times(dir, sdcardfs_lower_inode(dir)); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 212 | fsstack_copy_inode_size(dir, d_inode(lower_parent_dentry)); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 213 | |
| 214 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 215 | unlock_dir(lower_parent_dentry); |
| 216 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 217 | REVERT_CRED(); |
| 218 | return err; |
| 219 | } |
| 220 | #endif |
| 221 | |
| 222 | static int touch(char *abs_path, mode_t mode) { |
| 223 | struct file *filp = filp_open(abs_path, O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW, mode); |
| 224 | if (IS_ERR(filp)) { |
| 225 | if (PTR_ERR(filp) == -EEXIST) { |
| 226 | return 0; |
| 227 | } |
| 228 | else { |
| 229 | printk(KERN_ERR "sdcardfs: failed to open(%s): %ld\n", |
| 230 | abs_path, PTR_ERR(filp)); |
| 231 | return PTR_ERR(filp); |
| 232 | } |
| 233 | } |
| 234 | filp_close(filp, current->files); |
| 235 | return 0; |
| 236 | } |
| 237 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 238 | static int sdcardfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 239 | { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 240 | int err; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 241 | int make_nomedia_in_obb = 0; |
| 242 | struct dentry *lower_dentry; |
| 243 | struct dentry *lower_parent_dentry = NULL; |
| 244 | struct path lower_path; |
| 245 | struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb); |
| 246 | const struct cred *saved_cred = NULL; |
| 247 | struct sdcardfs_inode_info *pi = SDCARDFS_I(dir); |
| 248 | char *page_buf; |
| 249 | char *nomedia_dir_name; |
| 250 | char *nomedia_fullpath; |
| 251 | int fullpath_namelen; |
| 252 | int touch_err = 0; |
| 253 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 254 | if(!check_caller_access_to_name(dir, dentry->d_name.name)) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 255 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 256 | " dentry: %s, task:%s\n", |
| 257 | __func__, dentry->d_name.name, current->comm); |
| 258 | err = -EACCES; |
| 259 | goto out_eacces; |
| 260 | } |
| 261 | |
| 262 | /* save current_cred and override it */ |
| 263 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb), saved_cred); |
| 264 | |
| 265 | /* check disk space */ |
| 266 | if (!check_min_free_space(dentry, 0, 1)) { |
| 267 | printk(KERN_INFO "sdcardfs: No minimum free space.\n"); |
| 268 | err = -ENOSPC; |
| 269 | goto out_revert; |
| 270 | } |
| 271 | |
| 272 | /* the lower_dentry is negative here */ |
| 273 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 274 | lower_dentry = lower_path.dentry; |
| 275 | lower_parent_dentry = lock_parent(lower_dentry); |
| 276 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 277 | /* set last 16bytes of mode field to 0775 */ |
| 278 | mode = (mode & S_IFMT) | 00775; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 279 | err = vfs_mkdir(d_inode(lower_parent_dentry), lower_dentry, mode); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 280 | |
| 281 | if (err) |
| 282 | goto out; |
| 283 | |
| 284 | /* if it is a local obb dentry, setup it with the base obbpath */ |
| 285 | if(need_graft_path(dentry)) { |
| 286 | |
| 287 | err = setup_obb_dentry(dentry, &lower_path); |
| 288 | if(err) { |
| 289 | /* if the sbi->obbpath is not available, the lower_path won't be |
| 290 | * changed by setup_obb_dentry() but the lower path is saved to |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 291 | * its orig_path. this dentry will be revalidated later. |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 292 | * but now, the lower_path should be NULL */ |
| 293 | sdcardfs_put_reset_lower_path(dentry); |
| 294 | |
| 295 | /* the newly created lower path which saved to its orig_path or |
| 296 | * the lower_path is the base obbpath. |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 297 | * therefore, an additional path_get is required */ |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 298 | path_get(&lower_path); |
| 299 | } else |
| 300 | make_nomedia_in_obb = 1; |
| 301 | } |
| 302 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 303 | err = sdcardfs_interpose(dentry, dir->i_sb, &lower_path, pi->userid); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 304 | if (err) |
| 305 | goto out; |
| 306 | |
| 307 | fsstack_copy_attr_times(dir, sdcardfs_lower_inode(dir)); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 308 | fsstack_copy_inode_size(dir, d_inode(lower_parent_dentry)); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 309 | /* update number of links on parent directory */ |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 310 | set_nlink(dir, sdcardfs_lower_inode(dir)->i_nlink); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 311 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 312 | if ((!sbi->options.multiuser) && (!strcasecmp(dentry->d_name.name, "obb")) |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 313 | && (pi->perm == PERM_ANDROID) && (pi->userid == 0)) |
| 314 | make_nomedia_in_obb = 1; |
| 315 | |
| 316 | /* When creating /Android/data and /Android/obb, mark them as .nomedia */ |
| 317 | if (make_nomedia_in_obb || |
| 318 | ((pi->perm == PERM_ANDROID) && (!strcasecmp(dentry->d_name.name, "data")))) { |
| 319 | |
| 320 | page_buf = (char *)__get_free_page(GFP_KERNEL); |
| 321 | if (!page_buf) { |
| 322 | printk(KERN_ERR "sdcardfs: failed to allocate page buf\n"); |
| 323 | goto out; |
| 324 | } |
| 325 | |
| 326 | nomedia_dir_name = d_absolute_path(&lower_path, page_buf, PAGE_SIZE); |
| 327 | if (IS_ERR(nomedia_dir_name)) { |
| 328 | free_page((unsigned long)page_buf); |
| 329 | printk(KERN_ERR "sdcardfs: failed to get .nomedia dir name\n"); |
| 330 | goto out; |
| 331 | } |
| 332 | |
| 333 | fullpath_namelen = page_buf + PAGE_SIZE - nomedia_dir_name - 1; |
| 334 | fullpath_namelen += strlen("/.nomedia"); |
| 335 | nomedia_fullpath = kzalloc(fullpath_namelen + 1, GFP_KERNEL); |
| 336 | if (!nomedia_fullpath) { |
| 337 | free_page((unsigned long)page_buf); |
| 338 | printk(KERN_ERR "sdcardfs: failed to allocate .nomedia fullpath buf\n"); |
| 339 | goto out; |
| 340 | } |
| 341 | |
| 342 | strcpy(nomedia_fullpath, nomedia_dir_name); |
| 343 | free_page((unsigned long)page_buf); |
| 344 | strcat(nomedia_fullpath, "/.nomedia"); |
| 345 | touch_err = touch(nomedia_fullpath, 0664); |
| 346 | if (touch_err) { |
| 347 | printk(KERN_ERR "sdcardfs: failed to touch(%s): %d\n", |
| 348 | nomedia_fullpath, touch_err); |
| 349 | kfree(nomedia_fullpath); |
| 350 | goto out; |
| 351 | } |
| 352 | kfree(nomedia_fullpath); |
| 353 | } |
| 354 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 355 | unlock_dir(lower_parent_dentry); |
| 356 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 357 | out_revert: |
| 358 | REVERT_CRED(saved_cred); |
| 359 | out_eacces: |
| 360 | return err; |
| 361 | } |
| 362 | |
| 363 | static int sdcardfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 364 | { |
| 365 | struct dentry *lower_dentry; |
| 366 | struct dentry *lower_dir_dentry; |
| 367 | int err; |
| 368 | struct path lower_path; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 369 | const struct cred *saved_cred = NULL; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 370 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 371 | if(!check_caller_access_to_name(dir, dentry->d_name.name)) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 372 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 373 | " dentry: %s, task:%s\n", |
| 374 | __func__, dentry->d_name.name, current->comm); |
| 375 | err = -EACCES; |
| 376 | goto out_eacces; |
| 377 | } |
| 378 | |
| 379 | /* save current_cred and override it */ |
| 380 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb), saved_cred); |
| 381 | |
| 382 | /* sdcardfs_get_real_lower(): in case of remove an user's obb dentry |
| 383 | * the dentry on the original path should be deleted. */ |
| 384 | sdcardfs_get_real_lower(dentry, &lower_path); |
| 385 | |
| 386 | lower_dentry = lower_path.dentry; |
| 387 | lower_dir_dentry = lock_parent(lower_dentry); |
| 388 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 389 | err = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 390 | if (err) |
| 391 | goto out; |
| 392 | |
| 393 | d_drop(dentry); /* drop our dentry on success (why not VFS's job?) */ |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 394 | if (d_inode(dentry)) |
| 395 | clear_nlink(d_inode(dentry)); |
| 396 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
| 397 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); |
| 398 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 399 | |
| 400 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 401 | unlock_dir(lower_dir_dentry); |
| 402 | sdcardfs_put_real_lower(dentry, &lower_path); |
| 403 | REVERT_CRED(saved_cred); |
| 404 | out_eacces: |
| 405 | return err; |
| 406 | } |
| 407 | |
| 408 | #if 0 |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 409 | static int sdcardfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 410 | dev_t dev) |
| 411 | { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 412 | int err; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 413 | struct dentry *lower_dentry; |
| 414 | struct dentry *lower_parent_dentry = NULL; |
| 415 | struct path lower_path; |
| 416 | |
| 417 | OVERRIDE_CRED(SDCARDFS_SB(dir->i_sb)); |
| 418 | |
| 419 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 420 | lower_dentry = lower_path.dentry; |
| 421 | lower_parent_dentry = lock_parent(lower_dentry); |
| 422 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 423 | err = vfs_mknod(d_inode(lower_parent_dentry), lower_dentry, mode, dev); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 424 | if (err) |
| 425 | goto out; |
| 426 | |
| 427 | err = sdcardfs_interpose(dentry, dir->i_sb, &lower_path); |
| 428 | if (err) |
| 429 | goto out; |
| 430 | fsstack_copy_attr_times(dir, sdcardfs_lower_inode(dir)); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 431 | fsstack_copy_inode_size(dir, d_inode(lower_parent_dentry)); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 432 | |
| 433 | out: |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 434 | unlock_dir(lower_parent_dentry); |
| 435 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 436 | REVERT_CRED(); |
| 437 | return err; |
| 438 | } |
| 439 | #endif |
| 440 | |
| 441 | /* |
| 442 | * The locking rules in sdcardfs_rename are complex. We could use a simpler |
| 443 | * superblock-level name-space lock for renames and copy-ups. |
| 444 | */ |
| 445 | static int sdcardfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 446 | struct inode *new_dir, struct dentry *new_dentry) |
| 447 | { |
| 448 | int err = 0; |
| 449 | struct dentry *lower_old_dentry = NULL; |
| 450 | struct dentry *lower_new_dentry = NULL; |
| 451 | struct dentry *lower_old_dir_dentry = NULL; |
| 452 | struct dentry *lower_new_dir_dentry = NULL; |
| 453 | struct dentry *trap = NULL; |
| 454 | struct dentry *new_parent = NULL; |
| 455 | struct path lower_old_path, lower_new_path; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 456 | const struct cred *saved_cred = NULL; |
| 457 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 458 | if(!check_caller_access_to_name(old_dir, old_dentry->d_name.name) || |
| 459 | !check_caller_access_to_name(new_dir, new_dentry->d_name.name)) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 460 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 461 | " new_dentry: %s, task:%s\n", |
| 462 | __func__, new_dentry->d_name.name, current->comm); |
| 463 | err = -EACCES; |
| 464 | goto out_eacces; |
| 465 | } |
| 466 | |
| 467 | /* save current_cred and override it */ |
| 468 | OVERRIDE_CRED(SDCARDFS_SB(old_dir->i_sb), saved_cred); |
| 469 | |
| 470 | sdcardfs_get_real_lower(old_dentry, &lower_old_path); |
| 471 | sdcardfs_get_lower_path(new_dentry, &lower_new_path); |
| 472 | lower_old_dentry = lower_old_path.dentry; |
| 473 | lower_new_dentry = lower_new_path.dentry; |
| 474 | lower_old_dir_dentry = dget_parent(lower_old_dentry); |
| 475 | lower_new_dir_dentry = dget_parent(lower_new_dentry); |
| 476 | |
| 477 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
| 478 | /* source should not be ancestor of target */ |
| 479 | if (trap == lower_old_dentry) { |
| 480 | err = -EINVAL; |
| 481 | goto out; |
| 482 | } |
| 483 | /* target should not be ancestor of source */ |
| 484 | if (trap == lower_new_dentry) { |
| 485 | err = -ENOTEMPTY; |
| 486 | goto out; |
| 487 | } |
| 488 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 489 | err = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
| 490 | d_inode(lower_new_dir_dentry), lower_new_dentry, |
| 491 | NULL, 0); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 492 | if (err) |
| 493 | goto out; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 494 | |
| 495 | /* Copy attrs from lower dir, but i_uid/i_gid */ |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 496 | sdcardfs_copy_and_fix_attrs(new_dir, d_inode(lower_new_dir_dentry)); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 497 | fsstack_copy_inode_size(new_dir, d_inode(lower_new_dir_dentry)); |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 498 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 499 | if (new_dir != old_dir) { |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 500 | sdcardfs_copy_and_fix_attrs(old_dir, d_inode(lower_old_dir_dentry)); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 501 | fsstack_copy_inode_size(old_dir, d_inode(lower_old_dir_dentry)); |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 502 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 503 | /* update the derived permission of the old_dentry |
| 504 | * with its new parent |
| 505 | */ |
| 506 | new_parent = dget_parent(new_dentry); |
| 507 | if(new_parent) { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 508 | if(d_inode(old_dentry)) { |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 509 | update_derived_permission_lock(old_dentry); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 510 | } |
| 511 | dput(new_parent); |
| 512 | } |
| 513 | } |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 514 | /* At this point, not all dentry information has been moved, so |
| 515 | * we pass along new_dentry for the name.*/ |
| 516 | mutex_lock(&d_inode(old_dentry)->i_mutex); |
| 517 | get_derived_permission_new(new_dentry->d_parent, old_dentry, new_dentry); |
| 518 | fix_derived_permission(d_inode(old_dentry)); |
| 519 | get_derive_permissions_recursive(old_dentry); |
| 520 | mutex_unlock(&d_inode(old_dentry)->i_mutex); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 521 | out: |
| 522 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
| 523 | dput(lower_old_dir_dentry); |
| 524 | dput(lower_new_dir_dentry); |
| 525 | sdcardfs_put_real_lower(old_dentry, &lower_old_path); |
| 526 | sdcardfs_put_lower_path(new_dentry, &lower_new_path); |
| 527 | REVERT_CRED(saved_cred); |
| 528 | out_eacces: |
| 529 | return err; |
| 530 | } |
| 531 | |
| 532 | #if 0 |
| 533 | static int sdcardfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) |
| 534 | { |
| 535 | int err; |
| 536 | struct dentry *lower_dentry; |
| 537 | struct path lower_path; |
| 538 | /* XXX readlink does not requires overriding credential */ |
| 539 | |
| 540 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 541 | lower_dentry = lower_path.dentry; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 542 | if (!d_inode(lower_dentry)->i_op || |
| 543 | !d_inode(lower_dentry)->i_op->readlink) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 544 | err = -EINVAL; |
| 545 | goto out; |
| 546 | } |
| 547 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 548 | err = d_inode(lower_dentry)->i_op->readlink(lower_dentry, |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 549 | buf, bufsiz); |
| 550 | if (err < 0) |
| 551 | goto out; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 552 | fsstack_copy_attr_atime(d_inode(dentry), d_inode(lower_dentry)); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 553 | |
| 554 | out: |
| 555 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 556 | return err; |
| 557 | } |
| 558 | #endif |
| 559 | |
| 560 | #if 0 |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 561 | static const char *sdcardfs_follow_link(struct dentry *dentry, void **cookie) |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 562 | { |
| 563 | char *buf; |
| 564 | int len = PAGE_SIZE, err; |
| 565 | mm_segment_t old_fs; |
| 566 | |
| 567 | /* This is freed by the put_link method assuming a successful call. */ |
| 568 | buf = kmalloc(len, GFP_KERNEL); |
| 569 | if (!buf) { |
| 570 | buf = ERR_PTR(-ENOMEM); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 571 | return buf; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | /* read the symlink, and then we will follow it */ |
| 575 | old_fs = get_fs(); |
| 576 | set_fs(KERNEL_DS); |
| 577 | err = sdcardfs_readlink(dentry, buf, len); |
| 578 | set_fs(old_fs); |
| 579 | if (err < 0) { |
| 580 | kfree(buf); |
| 581 | buf = ERR_PTR(err); |
| 582 | } else { |
| 583 | buf[err] = '\0'; |
| 584 | } |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 585 | return *cookie = buf; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 586 | } |
| 587 | #endif |
| 588 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 589 | static int sdcardfs_permission(struct inode *inode, int mask) |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 590 | { |
| 591 | int err; |
| 592 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 593 | /* |
| 594 | * Permission check on sdcardfs inode. |
| 595 | * Calling process should have AID_SDCARD_RW permission |
| 596 | */ |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 597 | err = generic_permission(inode, mask); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 598 | |
| 599 | /* XXX |
| 600 | * Original sdcardfs code calls inode_permission(lower_inode,.. ) |
| 601 | * for checking inode permission. But doing such things here seems |
| 602 | * duplicated work, because the functions called after this func, |
| 603 | * such as vfs_create, vfs_unlink, vfs_rename, and etc, |
| 604 | * does exactly same thing, i.e., they calls inode_permission(). |
| 605 | * So we just let they do the things. |
| 606 | * If there are any security hole, just uncomment following if block. |
| 607 | */ |
| 608 | #if 0 |
| 609 | if (!err) { |
| 610 | /* |
| 611 | * Permission check on lower_inode(=EXT4). |
| 612 | * we check it with AID_MEDIA_RW permission |
| 613 | */ |
| 614 | struct inode *lower_inode; |
| 615 | OVERRIDE_CRED(SDCARDFS_SB(inode->sb)); |
| 616 | |
| 617 | lower_inode = sdcardfs_lower_inode(inode); |
| 618 | err = inode_permission(lower_inode, mask); |
| 619 | |
| 620 | REVERT_CRED(); |
| 621 | } |
| 622 | #endif |
| 623 | return err; |
| 624 | |
| 625 | } |
| 626 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 627 | static int sdcardfs_setattr(struct dentry *dentry, struct iattr *ia) |
| 628 | { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 629 | int err; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 630 | struct dentry *lower_dentry; |
| 631 | struct inode *inode; |
| 632 | struct inode *lower_inode; |
| 633 | struct path lower_path; |
| 634 | struct iattr lower_ia; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 635 | struct dentry *parent; |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 636 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 637 | inode = d_inode(dentry); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 638 | |
| 639 | /* |
| 640 | * Check if user has permission to change inode. We don't check if |
| 641 | * this user can change the lower inode: that should happen when |
| 642 | * calling notify_change on the lower inode. |
| 643 | */ |
| 644 | err = inode_change_ok(inode, ia); |
| 645 | |
| 646 | /* no vfs_XXX operations required, cred overriding will be skipped. wj*/ |
| 647 | if (!err) { |
| 648 | /* check the Android group ID */ |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 649 | parent = dget_parent(dentry); |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 650 | if(!check_caller_access_to_name(d_inode(parent), dentry->d_name.name)) { |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 651 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 652 | " dentry: %s, task:%s\n", |
| 653 | __func__, dentry->d_name.name, current->comm); |
| 654 | err = -EACCES; |
| 655 | } |
| 656 | dput(parent); |
| 657 | } |
| 658 | |
| 659 | if (err) |
| 660 | goto out_err; |
| 661 | |
| 662 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 663 | lower_dentry = lower_path.dentry; |
| 664 | lower_inode = sdcardfs_lower_inode(inode); |
| 665 | |
| 666 | /* prepare our own lower struct iattr (with the lower file) */ |
| 667 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
| 668 | if (ia->ia_valid & ATTR_FILE) |
| 669 | lower_ia.ia_file = sdcardfs_lower_file(ia->ia_file); |
| 670 | |
| 671 | lower_ia.ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE); |
| 672 | |
| 673 | /* |
| 674 | * If shrinking, first truncate upper level to cancel writing dirty |
| 675 | * pages beyond the new eof; and also if its' maxbytes is more |
| 676 | * limiting (fail with -EFBIG before making any change to the lower |
| 677 | * level). There is no need to vmtruncate the upper level |
| 678 | * afterwards in the other cases: we fsstack_copy_inode_size from |
| 679 | * the lower level. |
| 680 | */ |
| 681 | if (current->mm) |
| 682 | down_write(¤t->mm->mmap_sem); |
| 683 | if (ia->ia_valid & ATTR_SIZE) { |
| 684 | err = inode_newsize_ok(inode, ia->ia_size); |
| 685 | if (err) { |
| 686 | if (current->mm) |
| 687 | up_write(¤t->mm->mmap_sem); |
| 688 | goto out; |
| 689 | } |
| 690 | truncate_setsize(inode, ia->ia_size); |
| 691 | } |
| 692 | |
| 693 | /* |
| 694 | * mode change is for clearing setuid/setgid bits. Allow lower fs |
| 695 | * to interpret this in its own way. |
| 696 | */ |
| 697 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| 698 | lower_ia.ia_valid &= ~ATTR_MODE; |
| 699 | |
| 700 | /* notify the (possibly copied-up) lower inode */ |
| 701 | /* |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 702 | * Note: we use d_inode(lower_dentry), because lower_inode may be |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 703 | * unlinked (no inode->i_sb and i_ino==0. This happens if someone |
| 704 | * tries to open(), unlink(), then ftruncate() a file. |
| 705 | */ |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 706 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
| 707 | err = notify_change(lower_dentry, &lower_ia, /* note: lower_ia */ |
| 708 | NULL); |
| 709 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 710 | if (current->mm) |
| 711 | up_write(¤t->mm->mmap_sem); |
| 712 | if (err) |
| 713 | goto out; |
| 714 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 715 | /* get attributes from the lower inode and update derived permissions */ |
| 716 | sdcardfs_copy_and_fix_attrs(inode, lower_inode); |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 717 | |
| 718 | /* |
| 719 | * Not running fsstack_copy_inode_size(inode, lower_inode), because |
| 720 | * VFS should update our inode size, and notify_change on |
| 721 | * lower_inode should update its size. |
| 722 | */ |
| 723 | |
| 724 | out: |
| 725 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 726 | out_err: |
| 727 | return err; |
| 728 | } |
| 729 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 730 | static int sdcardfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 731 | struct kstat *stat) |
| 732 | { |
| 733 | struct dentry *lower_dentry; |
| 734 | struct inode *inode; |
| 735 | struct inode *lower_inode; |
| 736 | struct path lower_path; |
| 737 | struct dentry *parent; |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 738 | |
| 739 | parent = dget_parent(dentry); |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 740 | if(!check_caller_access_to_name(d_inode(parent), dentry->d_name.name)) { |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 741 | printk(KERN_INFO "%s: need to check the caller's gid in packages.list\n" |
| 742 | " dentry: %s, task:%s\n", |
| 743 | __func__, dentry->d_name.name, current->comm); |
| 744 | dput(parent); |
| 745 | return -EACCES; |
| 746 | } |
| 747 | dput(parent); |
| 748 | |
| 749 | inode = d_inode(dentry); |
| 750 | |
| 751 | sdcardfs_get_lower_path(dentry, &lower_path); |
| 752 | lower_dentry = lower_path.dentry; |
| 753 | lower_inode = sdcardfs_lower_inode(inode); |
| 754 | |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 755 | |
| 756 | sdcardfs_copy_and_fix_attrs(inode, lower_inode); |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 757 | fsstack_copy_inode_size(inode, lower_inode); |
Daniel Rosenberg | 497ac90 | 2016-02-03 21:08:21 -0800 | [diff] [blame^] | 758 | |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 759 | |
| 760 | generic_fillattr(inode, stat); |
| 761 | sdcardfs_put_lower_path(dentry, &lower_path); |
| 762 | return 0; |
| 763 | } |
| 764 | |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 765 | const struct inode_operations sdcardfs_symlink_iops = { |
| 766 | .permission = sdcardfs_permission, |
| 767 | .setattr = sdcardfs_setattr, |
| 768 | /* XXX Following operations are implemented, |
| 769 | * but FUSE(sdcard) or FAT does not support them |
| 770 | * These methods are *NOT* perfectly tested. |
| 771 | .readlink = sdcardfs_readlink, |
| 772 | .follow_link = sdcardfs_follow_link, |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 773 | .put_link = kfree_put_link, |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 774 | */ |
| 775 | }; |
| 776 | |
| 777 | const struct inode_operations sdcardfs_dir_iops = { |
| 778 | .create = sdcardfs_create, |
| 779 | .lookup = sdcardfs_lookup, |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 780 | #if 0 |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 781 | .permission = sdcardfs_permission, |
Daniel Campello | d1d080c | 2015-07-20 16:27:37 -0700 | [diff] [blame] | 782 | #endif |
Daniel Campello | 35c9e24 | 2015-07-20 16:23:50 -0700 | [diff] [blame] | 783 | .unlink = sdcardfs_unlink, |
| 784 | .mkdir = sdcardfs_mkdir, |
| 785 | .rmdir = sdcardfs_rmdir, |
| 786 | .rename = sdcardfs_rename, |
| 787 | .setattr = sdcardfs_setattr, |
| 788 | .getattr = sdcardfs_getattr, |
| 789 | /* XXX Following operations are implemented, |
| 790 | * but FUSE(sdcard) or FAT does not support them |
| 791 | * These methods are *NOT* perfectly tested. |
| 792 | .symlink = sdcardfs_symlink, |
| 793 | .link = sdcardfs_link, |
| 794 | .mknod = sdcardfs_mknod, |
| 795 | */ |
| 796 | }; |
| 797 | |
| 798 | const struct inode_operations sdcardfs_main_iops = { |
| 799 | .permission = sdcardfs_permission, |
| 800 | .setattr = sdcardfs_setattr, |
| 801 | .getattr = sdcardfs_getattr, |
| 802 | }; |