Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/libfs.c |
| 3 | * Library for filesystems writers. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/pagemap.h> |
| 8 | #include <linux/mount.h> |
| 9 | #include <linux/vfs.h> |
Ingo Molnar | 7cf34c7 | 2006-03-23 03:00:36 -0800 | [diff] [blame] | 10 | #include <linux/mutex.h> |
Christoph Hellwig | 2596110 | 2007-10-21 16:42:05 -0700 | [diff] [blame] | 11 | #include <linux/exportfs.h> |
Ingo Molnar | 7cf34c7 | 2006-03-23 03:00:36 -0800 | [diff] [blame] | 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <asm/uaccess.h> |
| 14 | |
| 15 | int simple_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 16 | struct kstat *stat) |
| 17 | { |
| 18 | struct inode *inode = dentry->d_inode; |
| 19 | generic_fillattr(inode, stat); |
| 20 | stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9); |
| 21 | return 0; |
| 22 | } |
| 23 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 24 | int simple_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 26 | buf->f_type = dentry->d_sb->s_magic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | buf->f_bsize = PAGE_CACHE_SIZE; |
| 28 | buf->f_namelen = NAME_MAX; |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | /* |
| 33 | * Retaining negative dentries for an in-memory filesystem just wastes |
| 34 | * memory and lookup time: arrange for them to be deleted immediately. |
| 35 | */ |
| 36 | static int simple_delete_dentry(struct dentry *dentry) |
| 37 | { |
| 38 | return 1; |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * Lookup the data. This is trivial - if the dentry didn't already |
| 43 | * exist, we know it is negative. Set d_op to delete negative dentries. |
| 44 | */ |
| 45 | struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 46 | { |
Al Viro | 3ba13d1 | 2009-02-20 06:02:22 +0000 | [diff] [blame] | 47 | static const struct dentry_operations simple_dentry_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | .d_delete = simple_delete_dentry, |
| 49 | }; |
| 50 | |
| 51 | if (dentry->d_name.len > NAME_MAX) |
| 52 | return ERR_PTR(-ENAMETOOLONG); |
| 53 | dentry->d_op = &simple_dentry_operations; |
| 54 | d_add(dentry, NULL); |
| 55 | return NULL; |
| 56 | } |
| 57 | |
| 58 | int simple_sync_file(struct file * file, struct dentry *dentry, int datasync) |
| 59 | { |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | int dcache_dir_open(struct inode *inode, struct file *file) |
| 64 | { |
| 65 | static struct qstr cursor_name = {.len = 1, .name = "."}; |
| 66 | |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 67 | file->private_data = d_alloc(file->f_path.dentry, &cursor_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | return file->private_data ? 0 : -ENOMEM; |
| 70 | } |
| 71 | |
| 72 | int dcache_dir_close(struct inode *inode, struct file *file) |
| 73 | { |
| 74 | dput(file->private_data); |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin) |
| 79 | { |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 80 | mutex_lock(&file->f_path.dentry->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | switch (origin) { |
| 82 | case 1: |
| 83 | offset += file->f_pos; |
| 84 | case 0: |
| 85 | if (offset >= 0) |
| 86 | break; |
| 87 | default: |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 88 | mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | return -EINVAL; |
| 90 | } |
| 91 | if (offset != file->f_pos) { |
| 92 | file->f_pos = offset; |
| 93 | if (file->f_pos >= 2) { |
| 94 | struct list_head *p; |
| 95 | struct dentry *cursor = file->private_data; |
| 96 | loff_t n = file->f_pos - 2; |
| 97 | |
| 98 | spin_lock(&dcache_lock); |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 99 | list_del(&cursor->d_u.d_child); |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 100 | p = file->f_path.dentry->d_subdirs.next; |
| 101 | while (n && p != &file->f_path.dentry->d_subdirs) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | struct dentry *next; |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 103 | next = list_entry(p, struct dentry, d_u.d_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | if (!d_unhashed(next) && next->d_inode) |
| 105 | n--; |
| 106 | p = p->next; |
| 107 | } |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 108 | list_add_tail(&cursor->d_u.d_child, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | spin_unlock(&dcache_lock); |
| 110 | } |
| 111 | } |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 112 | mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | return offset; |
| 114 | } |
| 115 | |
| 116 | /* Relationship between i_mode and the DT_xxx types */ |
| 117 | static inline unsigned char dt_type(struct inode *inode) |
| 118 | { |
| 119 | return (inode->i_mode >> 12) & 15; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Directory is locked and all positive dentries in it are safe, since |
| 124 | * for ramfs-type trees they can't go away without unlink() or rmdir(), |
| 125 | * both impossible due to the lock on directory. |
| 126 | */ |
| 127 | |
| 128 | int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 129 | { |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 130 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | struct dentry *cursor = filp->private_data; |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 132 | struct list_head *p, *q = &cursor->d_u.d_child; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | ino_t ino; |
| 134 | int i = filp->f_pos; |
| 135 | |
| 136 | switch (i) { |
| 137 | case 0: |
| 138 | ino = dentry->d_inode->i_ino; |
| 139 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 140 | break; |
| 141 | filp->f_pos++; |
| 142 | i++; |
| 143 | /* fallthrough */ |
| 144 | case 1: |
| 145 | ino = parent_ino(dentry); |
| 146 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 147 | break; |
| 148 | filp->f_pos++; |
| 149 | i++; |
| 150 | /* fallthrough */ |
| 151 | default: |
| 152 | spin_lock(&dcache_lock); |
Akinobu Mita | 1bfba4e | 2006-06-26 00:24:40 -0700 | [diff] [blame] | 153 | if (filp->f_pos == 2) |
| 154 | list_move(q, &dentry->d_subdirs); |
| 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | for (p=q->next; p != &dentry->d_subdirs; p=p->next) { |
| 157 | struct dentry *next; |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 158 | next = list_entry(p, struct dentry, d_u.d_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if (d_unhashed(next) || !next->d_inode) |
| 160 | continue; |
| 161 | |
| 162 | spin_unlock(&dcache_lock); |
Ronni Nielsen | 0f8952c2 | 2007-05-09 06:44:57 +0200 | [diff] [blame] | 163 | if (filldir(dirent, next->d_name.name, |
| 164 | next->d_name.len, filp->f_pos, |
| 165 | next->d_inode->i_ino, |
| 166 | dt_type(next->d_inode)) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | return 0; |
| 168 | spin_lock(&dcache_lock); |
| 169 | /* next is still alive */ |
Akinobu Mita | 1bfba4e | 2006-06-26 00:24:40 -0700 | [diff] [blame] | 170 | list_move(q, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | p = q; |
| 172 | filp->f_pos++; |
| 173 | } |
| 174 | spin_unlock(&dcache_lock); |
| 175 | } |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos) |
| 180 | { |
| 181 | return -EISDIR; |
| 182 | } |
| 183 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 184 | const struct file_operations simple_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | .open = dcache_dir_open, |
| 186 | .release = dcache_dir_close, |
| 187 | .llseek = dcache_dir_lseek, |
| 188 | .read = generic_read_dir, |
| 189 | .readdir = dcache_readdir, |
Hugh Dickins | 8ae0b77 | 2005-06-25 14:55:41 -0700 | [diff] [blame] | 190 | .fsync = simple_sync_file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | }; |
| 192 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 193 | const struct inode_operations simple_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | .lookup = simple_lookup, |
| 195 | }; |
| 196 | |
Hugh Dickins | 759b977 | 2007-03-05 00:30:28 -0800 | [diff] [blame] | 197 | static const struct super_operations simple_super_operations = { |
| 198 | .statfs = simple_statfs, |
| 199 | }; |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* |
| 202 | * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that |
| 203 | * will never be mountable) |
| 204 | */ |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 205 | int get_sb_pseudo(struct file_system_type *fs_type, char *name, |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 206 | const struct super_operations *ops, unsigned long magic, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 207 | struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
| 209 | struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | struct dentry *dentry; |
| 211 | struct inode *root; |
| 212 | struct qstr d_name = {.name = name, .len = strlen(name)}; |
| 213 | |
| 214 | if (IS_ERR(s)) |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 215 | return PTR_ERR(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | s->s_flags = MS_NOUSER; |
| 218 | s->s_maxbytes = ~0ULL; |
Alex Nixon | 3971e1a | 2008-07-29 22:33:03 -0700 | [diff] [blame] | 219 | s->s_blocksize = PAGE_SIZE; |
| 220 | s->s_blocksize_bits = PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | s->s_magic = magic; |
Hugh Dickins | 759b977 | 2007-03-05 00:30:28 -0800 | [diff] [blame] | 222 | s->s_op = ops ? ops : &simple_super_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | s->s_time_gran = 1; |
| 224 | root = new_inode(s); |
| 225 | if (!root) |
| 226 | goto Enomem; |
Jeff Layton | 1a1c9bb | 2007-05-08 00:32:31 -0700 | [diff] [blame] | 227 | /* |
| 228 | * since this is the first inode, make it number 1. New inodes created |
| 229 | * after this must take care not to collide with it (by passing |
| 230 | * max_reserved of 1 to iunique). |
| 231 | */ |
| 232 | root->i_ino = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME; |
| 235 | dentry = d_alloc(NULL, &d_name); |
| 236 | if (!dentry) { |
| 237 | iput(root); |
| 238 | goto Enomem; |
| 239 | } |
| 240 | dentry->d_sb = s; |
| 241 | dentry->d_parent = dentry; |
| 242 | d_instantiate(dentry, root); |
| 243 | s->s_root = dentry; |
| 244 | s->s_flags |= MS_ACTIVE; |
Sukadev Bhattiprolu | a3ec947 | 2009-03-04 12:06:34 -0800 | [diff] [blame] | 245 | simple_set_mnt(mnt, s); |
| 246 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | Enomem: |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 249 | deactivate_locked_super(s); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 250 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
| 254 | { |
| 255 | struct inode *inode = old_dentry->d_inode; |
| 256 | |
| 257 | inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 258 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | atomic_inc(&inode->i_count); |
| 260 | dget(dentry); |
| 261 | d_instantiate(dentry, inode); |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static inline int simple_positive(struct dentry *dentry) |
| 266 | { |
| 267 | return dentry->d_inode && !d_unhashed(dentry); |
| 268 | } |
| 269 | |
| 270 | int simple_empty(struct dentry *dentry) |
| 271 | { |
| 272 | struct dentry *child; |
| 273 | int ret = 0; |
| 274 | |
| 275 | spin_lock(&dcache_lock); |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 276 | list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (simple_positive(child)) |
| 278 | goto out; |
| 279 | ret = 1; |
| 280 | out: |
| 281 | spin_unlock(&dcache_lock); |
| 282 | return ret; |
| 283 | } |
| 284 | |
| 285 | int simple_unlink(struct inode *dir, struct dentry *dentry) |
| 286 | { |
| 287 | struct inode *inode = dentry->d_inode; |
| 288 | |
| 289 | inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 290 | drop_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | dput(dentry); |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | int simple_rmdir(struct inode *dir, struct dentry *dentry) |
| 296 | { |
| 297 | if (!simple_empty(dentry)) |
| 298 | return -ENOTEMPTY; |
| 299 | |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 300 | drop_nlink(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | simple_unlink(dir, dentry); |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 302 | drop_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | int simple_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 307 | struct inode *new_dir, struct dentry *new_dentry) |
| 308 | { |
| 309 | struct inode *inode = old_dentry->d_inode; |
| 310 | int they_are_dirs = S_ISDIR(old_dentry->d_inode->i_mode); |
| 311 | |
| 312 | if (!simple_empty(new_dentry)) |
| 313 | return -ENOTEMPTY; |
| 314 | |
| 315 | if (new_dentry->d_inode) { |
| 316 | simple_unlink(new_dir, new_dentry); |
| 317 | if (they_are_dirs) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 318 | drop_nlink(old_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } else if (they_are_dirs) { |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 320 | drop_nlink(old_dir); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 321 | inc_nlink(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = |
| 325 | new_dir->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 326 | |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | int simple_readpage(struct file *file, struct page *page) |
| 331 | { |
Pekka J Enberg | c0d92cb | 2006-09-29 01:59:09 -0700 | [diff] [blame] | 332 | clear_highpage(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | flush_dcache_page(page); |
| 334 | SetPageUptodate(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | unlock_page(page); |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | int simple_prepare_write(struct file *file, struct page *page, |
| 340 | unsigned from, unsigned to) |
| 341 | { |
| 342 | if (!PageUptodate(page)) { |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 343 | if (to - from != PAGE_CACHE_SIZE) |
| 344 | zero_user_segments(page, |
| 345 | 0, from, |
| 346 | to, PAGE_CACHE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | return 0; |
| 349 | } |
| 350 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 351 | int simple_write_begin(struct file *file, struct address_space *mapping, |
| 352 | loff_t pos, unsigned len, unsigned flags, |
| 353 | struct page **pagep, void **fsdata) |
| 354 | { |
| 355 | struct page *page; |
| 356 | pgoff_t index; |
| 357 | unsigned from; |
| 358 | |
| 359 | index = pos >> PAGE_CACHE_SHIFT; |
| 360 | from = pos & (PAGE_CACHE_SIZE - 1); |
| 361 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 362 | page = grab_cache_page_write_begin(mapping, index, flags); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 363 | if (!page) |
| 364 | return -ENOMEM; |
| 365 | |
| 366 | *pagep = page; |
| 367 | |
| 368 | return simple_prepare_write(file, page, from, from+len); |
| 369 | } |
| 370 | |
Adrian Bunk | 4a23942 | 2007-10-16 23:27:16 -0700 | [diff] [blame] | 371 | static int simple_commit_write(struct file *file, struct page *page, |
| 372 | unsigned from, unsigned to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | { |
| 374 | struct inode *inode = page->mapping->host; |
| 375 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
| 376 | |
Nick Piggin | 955eff5 | 2007-02-20 13:58:08 -0800 | [diff] [blame] | 377 | if (!PageUptodate(page)) |
| 378 | SetPageUptodate(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | /* |
| 380 | * No need to use i_size_read() here, the i_size |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 381 | * cannot change under us because we hold the i_mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | */ |
| 383 | if (pos > inode->i_size) |
| 384 | i_size_write(inode, pos); |
| 385 | set_page_dirty(page); |
| 386 | return 0; |
| 387 | } |
| 388 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 389 | int simple_write_end(struct file *file, struct address_space *mapping, |
| 390 | loff_t pos, unsigned len, unsigned copied, |
| 391 | struct page *page, void *fsdata) |
| 392 | { |
| 393 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
| 394 | |
| 395 | /* zero the stale part of the page if we did a short copy */ |
| 396 | if (copied < len) { |
| 397 | void *kaddr = kmap_atomic(page, KM_USER0); |
| 398 | memset(kaddr + from + copied, 0, len - copied); |
| 399 | flush_dcache_page(page); |
| 400 | kunmap_atomic(kaddr, KM_USER0); |
| 401 | } |
| 402 | |
| 403 | simple_commit_write(file, page, from, from+copied); |
| 404 | |
| 405 | unlock_page(page); |
| 406 | page_cache_release(page); |
| 407 | |
| 408 | return copied; |
| 409 | } |
| 410 | |
Jeff Layton | 1a1c9bb | 2007-05-08 00:32:31 -0700 | [diff] [blame] | 411 | /* |
| 412 | * the inodes created here are not hashed. If you use iunique to generate |
| 413 | * unique inode values later for this filesystem, then you must take care |
| 414 | * to pass it an appropriate max_reserved value to avoid collisions. |
| 415 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | int simple_fill_super(struct super_block *s, int magic, struct tree_descr *files) |
| 417 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct inode *inode; |
| 419 | struct dentry *root; |
| 420 | struct dentry *dentry; |
| 421 | int i; |
| 422 | |
| 423 | s->s_blocksize = PAGE_CACHE_SIZE; |
| 424 | s->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 425 | s->s_magic = magic; |
Hugh Dickins | 759b977 | 2007-03-05 00:30:28 -0800 | [diff] [blame] | 426 | s->s_op = &simple_super_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | s->s_time_gran = 1; |
| 428 | |
| 429 | inode = new_inode(s); |
| 430 | if (!inode) |
| 431 | return -ENOMEM; |
Jeff Layton | 1a1c9bb | 2007-05-08 00:32:31 -0700 | [diff] [blame] | 432 | /* |
| 433 | * because the root inode is 1, the files array must not contain an |
| 434 | * entry at index 1 |
| 435 | */ |
| 436 | inode->i_ino = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | inode->i_mode = S_IFDIR | 0755; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 439 | inode->i_op = &simple_dir_inode_operations; |
| 440 | inode->i_fop = &simple_dir_operations; |
Vincent Hanquez | 7656f32 | 2006-02-03 03:04:48 -0800 | [diff] [blame] | 441 | inode->i_nlink = 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | root = d_alloc_root(inode); |
| 443 | if (!root) { |
| 444 | iput(inode); |
| 445 | return -ENOMEM; |
| 446 | } |
| 447 | for (i = 0; !files->name || files->name[0]; i++, files++) { |
| 448 | if (!files->name) |
| 449 | continue; |
Jeff Layton | 1a1c9bb | 2007-05-08 00:32:31 -0700 | [diff] [blame] | 450 | |
| 451 | /* warn if it tries to conflict with the root inode */ |
| 452 | if (unlikely(i == 1)) |
| 453 | printk(KERN_WARNING "%s: %s passed in a files array" |
| 454 | "with an index of 1!\n", __func__, |
| 455 | s->s_type->name); |
| 456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | dentry = d_alloc_name(root, files->name); |
| 458 | if (!dentry) |
| 459 | goto out; |
| 460 | inode = new_inode(s); |
| 461 | if (!inode) |
| 462 | goto out; |
| 463 | inode->i_mode = S_IFREG | files->mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 465 | inode->i_fop = files->ops; |
| 466 | inode->i_ino = i; |
| 467 | d_add(dentry, inode); |
| 468 | } |
| 469 | s->s_root = root; |
| 470 | return 0; |
| 471 | out: |
| 472 | d_genocide(root); |
| 473 | dput(root); |
| 474 | return -ENOMEM; |
| 475 | } |
| 476 | |
| 477 | static DEFINE_SPINLOCK(pin_fs_lock); |
| 478 | |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 479 | int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | { |
| 481 | struct vfsmount *mnt = NULL; |
| 482 | spin_lock(&pin_fs_lock); |
| 483 | if (unlikely(!*mount)) { |
| 484 | spin_unlock(&pin_fs_lock); |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 485 | mnt = vfs_kern_mount(type, 0, type->name, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | if (IS_ERR(mnt)) |
| 487 | return PTR_ERR(mnt); |
| 488 | spin_lock(&pin_fs_lock); |
| 489 | if (!*mount) |
| 490 | *mount = mnt; |
| 491 | } |
| 492 | mntget(*mount); |
| 493 | ++*count; |
| 494 | spin_unlock(&pin_fs_lock); |
| 495 | mntput(mnt); |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | void simple_release_fs(struct vfsmount **mount, int *count) |
| 500 | { |
| 501 | struct vfsmount *mnt; |
| 502 | spin_lock(&pin_fs_lock); |
| 503 | mnt = *mount; |
| 504 | if (!--*count) |
| 505 | *mount = NULL; |
| 506 | spin_unlock(&pin_fs_lock); |
| 507 | mntput(mnt); |
| 508 | } |
| 509 | |
Akinobu Mita | 6d1029b | 2008-07-04 09:59:51 -0700 | [diff] [blame] | 510 | /** |
| 511 | * simple_read_from_buffer - copy data from the buffer to user space |
| 512 | * @to: the user space buffer to read to |
| 513 | * @count: the maximum number of bytes to read |
| 514 | * @ppos: the current position in the buffer |
| 515 | * @from: the buffer to read from |
| 516 | * @available: the size of the buffer |
| 517 | * |
| 518 | * The simple_read_from_buffer() function reads up to @count bytes from the |
| 519 | * buffer @from at offset @ppos into the user space address starting at @to. |
| 520 | * |
| 521 | * On success, the number of bytes read is returned and the offset @ppos is |
| 522 | * advanced by this number, or negative value is returned on error. |
| 523 | **/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos, |
| 525 | const void *from, size_t available) |
| 526 | { |
| 527 | loff_t pos = *ppos; |
| 528 | if (pos < 0) |
| 529 | return -EINVAL; |
| 530 | if (pos >= available) |
| 531 | return 0; |
| 532 | if (count > available - pos) |
| 533 | count = available - pos; |
| 534 | if (copy_to_user(to, from + pos, count)) |
| 535 | return -EFAULT; |
| 536 | *ppos = pos + count; |
| 537 | return count; |
| 538 | } |
| 539 | |
Akinobu Mita | 6d1029b | 2008-07-04 09:59:51 -0700 | [diff] [blame] | 540 | /** |
| 541 | * memory_read_from_buffer - copy data from the buffer |
| 542 | * @to: the kernel space buffer to read to |
| 543 | * @count: the maximum number of bytes to read |
| 544 | * @ppos: the current position in the buffer |
| 545 | * @from: the buffer to read from |
| 546 | * @available: the size of the buffer |
| 547 | * |
| 548 | * The memory_read_from_buffer() function reads up to @count bytes from the |
| 549 | * buffer @from at offset @ppos into the kernel space address starting at @to. |
| 550 | * |
| 551 | * On success, the number of bytes read is returned and the offset @ppos is |
| 552 | * advanced by this number, or negative value is returned on error. |
| 553 | **/ |
Akinobu Mita | 93b0711 | 2008-06-05 22:46:21 -0700 | [diff] [blame] | 554 | ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, |
| 555 | const void *from, size_t available) |
| 556 | { |
| 557 | loff_t pos = *ppos; |
| 558 | |
| 559 | if (pos < 0) |
| 560 | return -EINVAL; |
| 561 | if (pos >= available) |
| 562 | return 0; |
| 563 | if (count > available - pos) |
| 564 | count = available - pos; |
| 565 | memcpy(to, from + pos, count); |
| 566 | *ppos = pos + count; |
| 567 | |
| 568 | return count; |
| 569 | } |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | /* |
| 572 | * Transaction based IO. |
| 573 | * The file expects a single write which triggers the transaction, and then |
| 574 | * possibly a read which collects the result - which is stored in a |
| 575 | * file-local buffer. |
| 576 | */ |
Ingo Molnar | 76791ab | 2009-03-25 16:48:35 +0100 | [diff] [blame] | 577 | |
| 578 | void simple_transaction_set(struct file *file, size_t n) |
| 579 | { |
| 580 | struct simple_transaction_argresp *ar = file->private_data; |
| 581 | |
| 582 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); |
| 583 | |
| 584 | /* |
| 585 | * The barrier ensures that ar->size will really remain zero until |
| 586 | * ar->data is ready for reading. |
| 587 | */ |
| 588 | smp_mb(); |
| 589 | ar->size = n; |
| 590 | } |
| 591 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | char *simple_transaction_get(struct file *file, const char __user *buf, size_t size) |
| 593 | { |
| 594 | struct simple_transaction_argresp *ar; |
| 595 | static DEFINE_SPINLOCK(simple_transaction_lock); |
| 596 | |
| 597 | if (size > SIMPLE_TRANSACTION_LIMIT - 1) |
| 598 | return ERR_PTR(-EFBIG); |
| 599 | |
| 600 | ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL); |
| 601 | if (!ar) |
| 602 | return ERR_PTR(-ENOMEM); |
| 603 | |
| 604 | spin_lock(&simple_transaction_lock); |
| 605 | |
| 606 | /* only one write allowed per open */ |
| 607 | if (file->private_data) { |
| 608 | spin_unlock(&simple_transaction_lock); |
| 609 | free_page((unsigned long)ar); |
| 610 | return ERR_PTR(-EBUSY); |
| 611 | } |
| 612 | |
| 613 | file->private_data = ar; |
| 614 | |
| 615 | spin_unlock(&simple_transaction_lock); |
| 616 | |
| 617 | if (copy_from_user(ar->data, buf, size)) |
| 618 | return ERR_PTR(-EFAULT); |
| 619 | |
| 620 | return ar->data; |
| 621 | } |
| 622 | |
| 623 | ssize_t simple_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) |
| 624 | { |
| 625 | struct simple_transaction_argresp *ar = file->private_data; |
| 626 | |
| 627 | if (!ar) |
| 628 | return 0; |
| 629 | return simple_read_from_buffer(buf, size, pos, ar->data, ar->size); |
| 630 | } |
| 631 | |
| 632 | int simple_transaction_release(struct inode *inode, struct file *file) |
| 633 | { |
| 634 | free_page((unsigned long)file->private_data); |
| 635 | return 0; |
| 636 | } |
| 637 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 638 | /* Simple attribute files */ |
| 639 | |
| 640 | struct simple_attr { |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 641 | int (*get)(void *, u64 *); |
| 642 | int (*set)(void *, u64); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 643 | char get_buf[24]; /* enough to store a u64 and "\n\0" */ |
| 644 | char set_buf[24]; |
| 645 | void *data; |
| 646 | const char *fmt; /* format for read operation */ |
Ingo Molnar | 7cf34c7 | 2006-03-23 03:00:36 -0800 | [diff] [blame] | 647 | struct mutex mutex; /* protects access to these buffers */ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 648 | }; |
| 649 | |
| 650 | /* simple_attr_open is called by an actual attribute open file operation |
| 651 | * to set the attribute specific access operations. */ |
| 652 | int simple_attr_open(struct inode *inode, struct file *file, |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 653 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 654 | const char *fmt) |
| 655 | { |
| 656 | struct simple_attr *attr; |
| 657 | |
| 658 | attr = kmalloc(sizeof(*attr), GFP_KERNEL); |
| 659 | if (!attr) |
| 660 | return -ENOMEM; |
| 661 | |
| 662 | attr->get = get; |
| 663 | attr->set = set; |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 664 | attr->data = inode->i_private; |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 665 | attr->fmt = fmt; |
Ingo Molnar | 7cf34c7 | 2006-03-23 03:00:36 -0800 | [diff] [blame] | 666 | mutex_init(&attr->mutex); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 667 | |
| 668 | file->private_data = attr; |
| 669 | |
| 670 | return nonseekable_open(inode, file); |
| 671 | } |
| 672 | |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 673 | int simple_attr_release(struct inode *inode, struct file *file) |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 674 | { |
| 675 | kfree(file->private_data); |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | /* read from the buffer that is filled with the get function */ |
| 680 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
| 681 | size_t len, loff_t *ppos) |
| 682 | { |
| 683 | struct simple_attr *attr; |
| 684 | size_t size; |
| 685 | ssize_t ret; |
| 686 | |
| 687 | attr = file->private_data; |
| 688 | |
| 689 | if (!attr->get) |
| 690 | return -EACCES; |
| 691 | |
Christoph Hellwig | 9261303 | 2008-02-08 04:20:27 -0800 | [diff] [blame] | 692 | ret = mutex_lock_interruptible(&attr->mutex); |
| 693 | if (ret) |
| 694 | return ret; |
| 695 | |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 696 | if (*ppos) { /* continued read */ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 697 | size = strlen(attr->get_buf); |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 698 | } else { /* first read */ |
| 699 | u64 val; |
| 700 | ret = attr->get(attr->data, &val); |
| 701 | if (ret) |
| 702 | goto out; |
| 703 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 704 | size = scnprintf(attr->get_buf, sizeof(attr->get_buf), |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 705 | attr->fmt, (unsigned long long)val); |
| 706 | } |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 707 | |
| 708 | ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size); |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 709 | out: |
Ingo Molnar | 7cf34c7 | 2006-03-23 03:00:36 -0800 | [diff] [blame] | 710 | mutex_unlock(&attr->mutex); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 711 | return ret; |
| 712 | } |
| 713 | |
| 714 | /* interpret the buffer as a number to call the set function with */ |
| 715 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| 716 | size_t len, loff_t *ppos) |
| 717 | { |
| 718 | struct simple_attr *attr; |
| 719 | u64 val; |
| 720 | size_t size; |
| 721 | ssize_t ret; |
| 722 | |
| 723 | attr = file->private_data; |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 724 | if (!attr->set) |
| 725 | return -EACCES; |
| 726 | |
Christoph Hellwig | 9261303 | 2008-02-08 04:20:27 -0800 | [diff] [blame] | 727 | ret = mutex_lock_interruptible(&attr->mutex); |
| 728 | if (ret) |
| 729 | return ret; |
| 730 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 731 | ret = -EFAULT; |
| 732 | size = min(sizeof(attr->set_buf) - 1, len); |
| 733 | if (copy_from_user(attr->set_buf, buf, size)) |
| 734 | goto out; |
| 735 | |
| 736 | ret = len; /* claim we got the whole input */ |
| 737 | attr->set_buf[size] = '\0'; |
| 738 | val = simple_strtol(attr->set_buf, NULL, 0); |
| 739 | attr->set(attr->data, val); |
| 740 | out: |
Ingo Molnar | 7cf34c7 | 2006-03-23 03:00:36 -0800 | [diff] [blame] | 741 | mutex_unlock(&attr->mutex); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 742 | return ret; |
| 743 | } |
| 744 | |
Christoph Hellwig | 2596110 | 2007-10-21 16:42:05 -0700 | [diff] [blame] | 745 | /** |
| 746 | * generic_fh_to_dentry - generic helper for the fh_to_dentry export operation |
| 747 | * @sb: filesystem to do the file handle conversion on |
| 748 | * @fid: file handle to convert |
| 749 | * @fh_len: length of the file handle in bytes |
| 750 | * @fh_type: type of file handle |
| 751 | * @get_inode: filesystem callback to retrieve inode |
| 752 | * |
| 753 | * This function decodes @fid as long as it has one of the well-known |
| 754 | * Linux filehandle types and calls @get_inode on it to retrieve the |
| 755 | * inode for the object specified in the file handle. |
| 756 | */ |
| 757 | struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 758 | int fh_len, int fh_type, struct inode *(*get_inode) |
| 759 | (struct super_block *sb, u64 ino, u32 gen)) |
| 760 | { |
| 761 | struct inode *inode = NULL; |
| 762 | |
| 763 | if (fh_len < 2) |
| 764 | return NULL; |
| 765 | |
| 766 | switch (fh_type) { |
| 767 | case FILEID_INO32_GEN: |
| 768 | case FILEID_INO32_GEN_PARENT: |
| 769 | inode = get_inode(sb, fid->i32.ino, fid->i32.gen); |
| 770 | break; |
| 771 | } |
| 772 | |
Christoph Hellwig | 4ea3ada | 2008-08-11 15:48:57 +0200 | [diff] [blame] | 773 | return d_obtain_alias(inode); |
Christoph Hellwig | 2596110 | 2007-10-21 16:42:05 -0700 | [diff] [blame] | 774 | } |
| 775 | EXPORT_SYMBOL_GPL(generic_fh_to_dentry); |
| 776 | |
| 777 | /** |
| 778 | * generic_fh_to_dentry - generic helper for the fh_to_parent export operation |
| 779 | * @sb: filesystem to do the file handle conversion on |
| 780 | * @fid: file handle to convert |
| 781 | * @fh_len: length of the file handle in bytes |
| 782 | * @fh_type: type of file handle |
| 783 | * @get_inode: filesystem callback to retrieve inode |
| 784 | * |
| 785 | * This function decodes @fid as long as it has one of the well-known |
| 786 | * Linux filehandle types and calls @get_inode on it to retrieve the |
| 787 | * inode for the _parent_ object specified in the file handle if it |
| 788 | * is specified in the file handle, or NULL otherwise. |
| 789 | */ |
| 790 | struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 791 | int fh_len, int fh_type, struct inode *(*get_inode) |
| 792 | (struct super_block *sb, u64 ino, u32 gen)) |
| 793 | { |
| 794 | struct inode *inode = NULL; |
| 795 | |
| 796 | if (fh_len <= 2) |
| 797 | return NULL; |
| 798 | |
| 799 | switch (fh_type) { |
| 800 | case FILEID_INO32_GEN_PARENT: |
| 801 | inode = get_inode(sb, fid->i32.parent_ino, |
| 802 | (fh_len > 3 ? fid->i32.parent_gen : 0)); |
| 803 | break; |
| 804 | } |
| 805 | |
Christoph Hellwig | 4ea3ada | 2008-08-11 15:48:57 +0200 | [diff] [blame] | 806 | return d_obtain_alias(inode); |
Christoph Hellwig | 2596110 | 2007-10-21 16:42:05 -0700 | [diff] [blame] | 807 | } |
| 808 | EXPORT_SYMBOL_GPL(generic_fh_to_parent); |
| 809 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | EXPORT_SYMBOL(dcache_dir_close); |
| 811 | EXPORT_SYMBOL(dcache_dir_lseek); |
| 812 | EXPORT_SYMBOL(dcache_dir_open); |
| 813 | EXPORT_SYMBOL(dcache_readdir); |
| 814 | EXPORT_SYMBOL(generic_read_dir); |
| 815 | EXPORT_SYMBOL(get_sb_pseudo); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 816 | EXPORT_SYMBOL(simple_write_begin); |
| 817 | EXPORT_SYMBOL(simple_write_end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | EXPORT_SYMBOL(simple_dir_inode_operations); |
| 819 | EXPORT_SYMBOL(simple_dir_operations); |
| 820 | EXPORT_SYMBOL(simple_empty); |
| 821 | EXPORT_SYMBOL(d_alloc_name); |
| 822 | EXPORT_SYMBOL(simple_fill_super); |
| 823 | EXPORT_SYMBOL(simple_getattr); |
| 824 | EXPORT_SYMBOL(simple_link); |
| 825 | EXPORT_SYMBOL(simple_lookup); |
| 826 | EXPORT_SYMBOL(simple_pin_fs); |
Nick Piggin | 4e02ed4 | 2008-10-29 14:00:55 -0700 | [diff] [blame] | 827 | EXPORT_UNUSED_SYMBOL(simple_prepare_write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | EXPORT_SYMBOL(simple_readpage); |
| 829 | EXPORT_SYMBOL(simple_release_fs); |
| 830 | EXPORT_SYMBOL(simple_rename); |
| 831 | EXPORT_SYMBOL(simple_rmdir); |
| 832 | EXPORT_SYMBOL(simple_statfs); |
| 833 | EXPORT_SYMBOL(simple_sync_file); |
| 834 | EXPORT_SYMBOL(simple_unlink); |
| 835 | EXPORT_SYMBOL(simple_read_from_buffer); |
Akinobu Mita | 93b0711 | 2008-06-05 22:46:21 -0700 | [diff] [blame] | 836 | EXPORT_SYMBOL(memory_read_from_buffer); |
Ingo Molnar | 76791ab | 2009-03-25 16:48:35 +0100 | [diff] [blame] | 837 | EXPORT_SYMBOL(simple_transaction_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | EXPORT_SYMBOL(simple_transaction_get); |
| 839 | EXPORT_SYMBOL(simple_transaction_read); |
| 840 | EXPORT_SYMBOL(simple_transaction_release); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 841 | EXPORT_SYMBOL_GPL(simple_attr_open); |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 842 | EXPORT_SYMBOL_GPL(simple_attr_release); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 843 | EXPORT_SYMBOL_GPL(simple_attr_read); |
| 844 | EXPORT_SYMBOL_GPL(simple_attr_write); |