Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * hugetlbpage-backed filesystem. Based on ramfs. | |
3 | * | |
4 | * William Irwin, 2002 | |
5 | * | |
6 | * Copyright (C) 2002 Linus Torvalds. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/thread_info.h> | |
11 | #include <asm/current.h> | |
12 | #include <linux/sched.h> /* remove ASAP */ | |
13 | #include <linux/fs.h> | |
14 | #include <linux/mount.h> | |
15 | #include <linux/file.h> | |
e73a75fa | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/writeback.h> |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/highmem.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/string.h> | |
16f7e0fe | 22 | #include <linux/capability.h> |
e73a75fa | 23 | #include <linux/ctype.h> |
1da177e4 LT |
24 | #include <linux/backing-dev.h> |
25 | #include <linux/hugetlb.h> | |
26 | #include <linux/pagevec.h> | |
e73a75fa | 27 | #include <linux/parser.h> |
036e0856 | 28 | #include <linux/mman.h> |
1da177e4 LT |
29 | #include <linux/slab.h> |
30 | #include <linux/dnotify.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/security.h> | |
c9d9ac52 | 33 | #include <linux/ima.h> |
1da177e4 LT |
34 | |
35 | #include <asm/uaccess.h> | |
36 | ||
37 | /* some random number */ | |
38 | #define HUGETLBFS_MAGIC 0x958458f6 | |
39 | ||
ee9b6d61 | 40 | static const struct super_operations hugetlbfs_ops; |
f5e54d6e | 41 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 42 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
43 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
44 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 LT |
45 | |
46 | static struct backing_dev_info hugetlbfs_backing_dev_info = { | |
d993831f | 47 | .name = "hugetlbfs", |
1da177e4 | 48 | .ra_pages = 0, /* No readahead */ |
e4ad08fe | 49 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
1da177e4 LT |
50 | }; |
51 | ||
52 | int sysctl_hugetlb_shm_group; | |
53 | ||
e73a75fa RD |
54 | enum { |
55 | Opt_size, Opt_nr_inodes, | |
56 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 57 | Opt_pagesize, |
e73a75fa RD |
58 | Opt_err, |
59 | }; | |
60 | ||
a447c093 | 61 | static const match_table_t tokens = { |
e73a75fa RD |
62 | {Opt_size, "size=%s"}, |
63 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
64 | {Opt_mode, "mode=%o"}, | |
65 | {Opt_uid, "uid=%u"}, | |
66 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 67 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
68 | {Opt_err, NULL}, |
69 | }; | |
70 | ||
2e9b367c AL |
71 | static void huge_pagevec_release(struct pagevec *pvec) |
72 | { | |
73 | int i; | |
74 | ||
75 | for (i = 0; i < pagevec_count(pvec); ++i) | |
76 | put_page(pvec->pages[i]); | |
77 | ||
78 | pagevec_reinit(pvec); | |
79 | } | |
80 | ||
1da177e4 LT |
81 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
82 | { | |
b39424e2 | 83 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
84 | loff_t len, vma_len; |
85 | int ret; | |
a5516438 | 86 | struct hstate *h = hstate_file(file); |
1da177e4 | 87 | |
68589bc3 | 88 | /* |
dec4ad86 DG |
89 | * vma address alignment (but not the pgoff alignment) has |
90 | * already been checked by prepare_hugepage_range. If you add | |
91 | * any error returns here, do so after setting VM_HUGETLB, so | |
92 | * is_vm_hugetlb_page tests below unmap_region go the right | |
93 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
94 | * and ia64). | |
68589bc3 HD |
95 | */ |
96 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; | |
97 | vma->vm_ops = &hugetlb_vm_ops; | |
1da177e4 | 98 | |
a5516438 | 99 | if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
100 | return -EINVAL; |
101 | ||
1da177e4 LT |
102 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
103 | ||
1b1dcc1b | 104 | mutex_lock(&inode->i_mutex); |
1da177e4 | 105 | file_accessed(file); |
1da177e4 LT |
106 | |
107 | ret = -ENOMEM; | |
108 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 109 | |
a1e78772 | 110 | if (hugetlb_reserve_pages(inode, |
a5516438 | 111 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
112 | len >> huge_page_shift(h), vma, |
113 | vma->vm_flags)) | |
a43a8c39 | 114 | goto out; |
b45b5bd6 | 115 | |
4c887265 AL |
116 | ret = 0; |
117 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 118 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
119 | inode->i_size = len; |
120 | out: | |
1b1dcc1b | 121 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
122 | |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
508034a3 | 127 | * Called under down_write(mmap_sem). |
1da177e4 LT |
128 | */ |
129 | ||
d2ba27e8 | 130 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
131 | static unsigned long |
132 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
133 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
134 | { | |
135 | struct mm_struct *mm = current->mm; | |
136 | struct vm_area_struct *vma; | |
137 | unsigned long start_addr; | |
a5516438 | 138 | struct hstate *h = hstate_file(file); |
1da177e4 | 139 | |
a5516438 | 140 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
141 | return -EINVAL; |
142 | if (len > TASK_SIZE) | |
143 | return -ENOMEM; | |
144 | ||
036e0856 | 145 | if (flags & MAP_FIXED) { |
a5516438 | 146 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
147 | return -EINVAL; |
148 | return addr; | |
149 | } | |
150 | ||
1da177e4 | 151 | if (addr) { |
a5516438 | 152 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
153 | vma = find_vma(mm, addr); |
154 | if (TASK_SIZE - len >= addr && | |
155 | (!vma || addr + len <= vma->vm_start)) | |
156 | return addr; | |
157 | } | |
158 | ||
159 | start_addr = mm->free_area_cache; | |
160 | ||
1363c3cd WW |
161 | if (len <= mm->cached_hole_size) |
162 | start_addr = TASK_UNMAPPED_BASE; | |
163 | ||
1da177e4 | 164 | full_search: |
a5516438 | 165 | addr = ALIGN(start_addr, huge_page_size(h)); |
1da177e4 LT |
166 | |
167 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |
168 | /* At this point: (!vma || addr < vma->vm_end). */ | |
169 | if (TASK_SIZE - len < addr) { | |
170 | /* | |
171 | * Start a new search - just in case we missed | |
172 | * some holes. | |
173 | */ | |
174 | if (start_addr != TASK_UNMAPPED_BASE) { | |
175 | start_addr = TASK_UNMAPPED_BASE; | |
176 | goto full_search; | |
177 | } | |
178 | return -ENOMEM; | |
179 | } | |
180 | ||
181 | if (!vma || addr + len <= vma->vm_start) | |
182 | return addr; | |
a5516438 | 183 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
1da177e4 LT |
184 | } |
185 | } | |
186 | #endif | |
187 | ||
e63e1e5a BP |
188 | static int |
189 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
190 | char __user *buf, unsigned long count, | |
191 | unsigned long size) | |
192 | { | |
193 | char *kaddr; | |
194 | unsigned long left, copied = 0; | |
195 | int i, chunksize; | |
196 | ||
197 | if (size > count) | |
198 | size = count; | |
199 | ||
200 | /* Find which 4k chunk and offset with in that chunk */ | |
201 | i = offset >> PAGE_CACHE_SHIFT; | |
202 | offset = offset & ~PAGE_CACHE_MASK; | |
203 | ||
204 | while (size) { | |
205 | chunksize = PAGE_CACHE_SIZE; | |
206 | if (offset) | |
207 | chunksize -= offset; | |
208 | if (chunksize > size) | |
209 | chunksize = size; | |
210 | kaddr = kmap(&page[i]); | |
211 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
212 | kunmap(&page[i]); | |
213 | if (left) { | |
214 | copied += (chunksize - left); | |
215 | break; | |
216 | } | |
217 | offset = 0; | |
218 | size -= chunksize; | |
219 | buf += chunksize; | |
220 | copied += chunksize; | |
221 | i++; | |
222 | } | |
223 | return copied ? copied : -EFAULT; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Support for read() - Find the page attached to f_mapping and copy out the | |
228 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
229 | * since it has PAGE_CACHE_SIZE assumptions. | |
230 | */ | |
231 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
232 | size_t len, loff_t *ppos) | |
233 | { | |
a5516438 | 234 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
235 | struct address_space *mapping = filp->f_mapping; |
236 | struct inode *inode = mapping->host; | |
a5516438 AK |
237 | unsigned long index = *ppos >> huge_page_shift(h); |
238 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
239 | unsigned long end_index; |
240 | loff_t isize; | |
241 | ssize_t retval = 0; | |
242 | ||
243 | mutex_lock(&inode->i_mutex); | |
244 | ||
245 | /* validate length */ | |
246 | if (len == 0) | |
247 | goto out; | |
248 | ||
249 | isize = i_size_read(inode); | |
250 | if (!isize) | |
251 | goto out; | |
252 | ||
a5516438 | 253 | end_index = (isize - 1) >> huge_page_shift(h); |
e63e1e5a BP |
254 | for (;;) { |
255 | struct page *page; | |
a5516438 | 256 | unsigned long nr, ret; |
91bf189c | 257 | int ra; |
e63e1e5a BP |
258 | |
259 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 260 | nr = huge_page_size(h); |
e63e1e5a BP |
261 | if (index >= end_index) { |
262 | if (index > end_index) | |
263 | goto out; | |
a5516438 | 264 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
e63e1e5a BP |
265 | if (nr <= offset) { |
266 | goto out; | |
267 | } | |
268 | } | |
269 | nr = nr - offset; | |
270 | ||
271 | /* Find the page */ | |
272 | page = find_get_page(mapping, index); | |
273 | if (unlikely(page == NULL)) { | |
274 | /* | |
275 | * We have a HOLE, zero out the user-buffer for the | |
276 | * length of the hole or request. | |
277 | */ | |
278 | ret = len < nr ? len : nr; | |
279 | if (clear_user(buf, ret)) | |
91bf189c RK |
280 | ra = -EFAULT; |
281 | else | |
282 | ra = 0; | |
e63e1e5a BP |
283 | } else { |
284 | /* | |
285 | * We have the page, copy it to user space buffer. | |
286 | */ | |
91bf189c RK |
287 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
288 | ret = ra; | |
e63e1e5a | 289 | } |
91bf189c | 290 | if (ra < 0) { |
e63e1e5a | 291 | if (retval == 0) |
91bf189c | 292 | retval = ra; |
e63e1e5a BP |
293 | if (page) |
294 | page_cache_release(page); | |
295 | goto out; | |
296 | } | |
297 | ||
298 | offset += ret; | |
299 | retval += ret; | |
300 | len -= ret; | |
a5516438 AK |
301 | index += offset >> huge_page_shift(h); |
302 | offset &= ~huge_page_mask(h); | |
e63e1e5a BP |
303 | |
304 | if (page) | |
305 | page_cache_release(page); | |
306 | ||
307 | /* short read or no more work */ | |
308 | if ((ret != nr) || (len == 0)) | |
309 | break; | |
310 | } | |
311 | out: | |
a5516438 | 312 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
313 | mutex_unlock(&inode->i_mutex); |
314 | return retval; | |
315 | } | |
316 | ||
800d15a5 NP |
317 | static int hugetlbfs_write_begin(struct file *file, |
318 | struct address_space *mapping, | |
319 | loff_t pos, unsigned len, unsigned flags, | |
320 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
321 | { |
322 | return -EINVAL; | |
323 | } | |
324 | ||
800d15a5 NP |
325 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
326 | loff_t pos, unsigned len, unsigned copied, | |
327 | struct page *page, void *fsdata) | |
1da177e4 | 328 | { |
800d15a5 | 329 | BUG(); |
1da177e4 LT |
330 | return -EINVAL; |
331 | } | |
332 | ||
1da177e4 LT |
333 | static void truncate_huge_page(struct page *page) |
334 | { | |
fba2591b | 335 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 LT |
336 | ClearPageUptodate(page); |
337 | remove_from_page_cache(page); | |
338 | put_page(page); | |
339 | } | |
340 | ||
b45b5bd6 | 341 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 342 | { |
a5516438 | 343 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 344 | struct address_space *mapping = &inode->i_data; |
a5516438 | 345 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
346 | struct pagevec pvec; |
347 | pgoff_t next; | |
a43a8c39 | 348 | int i, freed = 0; |
1da177e4 LT |
349 | |
350 | pagevec_init(&pvec, 0); | |
351 | next = start; | |
352 | while (1) { | |
353 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
354 | if (next == start) | |
355 | break; | |
356 | next = start; | |
357 | continue; | |
358 | } | |
359 | ||
360 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
361 | struct page *page = pvec.pages[i]; | |
362 | ||
363 | lock_page(page); | |
364 | if (page->index > next) | |
365 | next = page->index; | |
366 | ++next; | |
367 | truncate_huge_page(page); | |
368 | unlock_page(page); | |
a43a8c39 | 369 | freed++; |
1da177e4 LT |
370 | } |
371 | huge_pagevec_release(&pvec); | |
372 | } | |
373 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 374 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
375 | } |
376 | ||
377 | static void hugetlbfs_delete_inode(struct inode *inode) | |
378 | { | |
b45b5bd6 | 379 | truncate_hugepages(inode, 0); |
149f4211 CH |
380 | clear_inode(inode); |
381 | } | |
382 | ||
ddc0a51d | 383 | static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock) |
1da177e4 | 384 | { |
0b1533f6 CH |
385 | struct super_block *sb = inode->i_sb; |
386 | ||
387 | if (!hlist_unhashed(&inode->i_hash)) { | |
1c0eeaf5 | 388 | if (!(inode->i_state & (I_DIRTY|I_SYNC))) |
0b1533f6 CH |
389 | list_move(&inode->i_list, &inode_unused); |
390 | inodes_stat.nr_unused++; | |
391 | if (!sb || (sb->s_flags & MS_ACTIVE)) { | |
392 | spin_unlock(&inode_lock); | |
393 | return; | |
394 | } | |
395 | inode->i_state |= I_WILL_FREE; | |
1da177e4 | 396 | spin_unlock(&inode_lock); |
0b1533f6 CH |
397 | /* |
398 | * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK | |
399 | * in our backing_dev_info. | |
400 | */ | |
401 | write_inode_now(inode, 1); | |
402 | spin_lock(&inode_lock); | |
403 | inode->i_state &= ~I_WILL_FREE; | |
404 | inodes_stat.nr_unused--; | |
405 | hlist_del_init(&inode->i_hash); | |
1da177e4 | 406 | } |
1da177e4 LT |
407 | list_del_init(&inode->i_list); |
408 | list_del_init(&inode->i_sb_list); | |
409 | inode->i_state |= I_FREEING; | |
410 | inodes_stat.nr_inodes--; | |
411 | spin_unlock(&inode_lock); | |
b45b5bd6 | 412 | truncate_hugepages(inode, 0); |
1da177e4 LT |
413 | clear_inode(inode); |
414 | destroy_inode(inode); | |
415 | } | |
416 | ||
417 | static void hugetlbfs_drop_inode(struct inode *inode) | |
418 | { | |
419 | if (!inode->i_nlink) | |
6b09b9df | 420 | generic_delete_inode(inode); |
1da177e4 LT |
421 | else |
422 | hugetlbfs_forget_inode(inode); | |
423 | } | |
424 | ||
1da177e4 | 425 | static inline void |
856fc295 | 426 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
1da177e4 LT |
427 | { |
428 | struct vm_area_struct *vma; | |
429 | struct prio_tree_iter iter; | |
430 | ||
856fc295 | 431 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
432 | unsigned long v_offset; |
433 | ||
1da177e4 | 434 | /* |
856fc295 HD |
435 | * Can the expression below overflow on 32-bit arches? |
436 | * No, because the prio_tree returns us only those vmas | |
437 | * which overlap the truncated area starting at pgoff, | |
438 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 439 | */ |
856fc295 HD |
440 | if (vma->vm_pgoff < pgoff) |
441 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
442 | else | |
1da177e4 LT |
443 | v_offset = 0; |
444 | ||
502717f4 | 445 | __unmap_hugepage_range(vma, |
04f2cbe3 | 446 | vma->vm_start + v_offset, vma->vm_end, NULL); |
1da177e4 LT |
447 | } |
448 | } | |
449 | ||
1da177e4 LT |
450 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
451 | { | |
856fc295 | 452 | pgoff_t pgoff; |
1da177e4 | 453 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 454 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 455 | |
a5516438 | 456 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 457 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 458 | |
7aa91e10 | 459 | i_size_write(inode, offset); |
1da177e4 LT |
460 | spin_lock(&mapping->i_mmap_lock); |
461 | if (!prio_tree_empty(&mapping->i_mmap)) | |
462 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); | |
463 | spin_unlock(&mapping->i_mmap_lock); | |
b45b5bd6 | 464 | truncate_hugepages(inode, offset); |
1da177e4 LT |
465 | return 0; |
466 | } | |
467 | ||
468 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
469 | { | |
470 | struct inode *inode = dentry->d_inode; | |
a5516438 | 471 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
472 | int error; |
473 | unsigned int ia_valid = attr->ia_valid; | |
474 | ||
475 | BUG_ON(!inode); | |
476 | ||
477 | error = inode_change_ok(inode, attr); | |
478 | if (error) | |
479 | goto out; | |
480 | ||
481 | if (ia_valid & ATTR_SIZE) { | |
482 | error = -EINVAL; | |
a5516438 | 483 | if (!(attr->ia_size & ~huge_page_mask(h))) |
1da177e4 LT |
484 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
485 | if (error) | |
486 | goto out; | |
487 | attr->ia_valid &= ~ATTR_SIZE; | |
488 | } | |
489 | error = inode_setattr(inode, attr); | |
490 | out: | |
491 | return error; | |
492 | } | |
493 | ||
494 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, | |
495 | gid_t gid, int mode, dev_t dev) | |
496 | { | |
497 | struct inode *inode; | |
1da177e4 LT |
498 | |
499 | inode = new_inode(sb); | |
500 | if (inode) { | |
501 | struct hugetlbfs_inode_info *info; | |
502 | inode->i_mode = mode; | |
503 | inode->i_uid = uid; | |
504 | inode->i_gid = gid; | |
1da177e4 LT |
505 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
506 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
507 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a43a8c39 | 508 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
1da177e4 | 509 | info = HUGETLBFS_I(inode); |
6bfde05b EM |
510 | /* |
511 | * The policy is initialized here even if we are creating a | |
512 | * private inode because initialization simply creates an | |
513 | * an empty rb tree and calls spin_lock_init(), later when we | |
514 | * call mpol_free_shared_policy() it will just return because | |
515 | * the rb tree will still be empty. | |
516 | */ | |
71fe804b | 517 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
518 | switch (mode & S_IFMT) { |
519 | default: | |
520 | init_special_inode(inode, mode, dev); | |
521 | break; | |
522 | case S_IFREG: | |
523 | inode->i_op = &hugetlbfs_inode_operations; | |
524 | inode->i_fop = &hugetlbfs_file_operations; | |
525 | break; | |
526 | case S_IFDIR: | |
527 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
528 | inode->i_fop = &simple_dir_operations; | |
529 | ||
530 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 531 | inc_nlink(inode); |
1da177e4 LT |
532 | break; |
533 | case S_IFLNK: | |
534 | inode->i_op = &page_symlink_inode_operations; | |
535 | break; | |
536 | } | |
537 | } | |
538 | return inode; | |
539 | } | |
540 | ||
541 | /* | |
542 | * File creation. Allocate an inode, and we're done.. | |
543 | */ | |
544 | static int hugetlbfs_mknod(struct inode *dir, | |
545 | struct dentry *dentry, int mode, dev_t dev) | |
546 | { | |
547 | struct inode *inode; | |
548 | int error = -ENOSPC; | |
549 | gid_t gid; | |
550 | ||
551 | if (dir->i_mode & S_ISGID) { | |
552 | gid = dir->i_gid; | |
553 | if (S_ISDIR(mode)) | |
554 | mode |= S_ISGID; | |
555 | } else { | |
77c70de1 | 556 | gid = current_fsgid(); |
1da177e4 | 557 | } |
77c70de1 | 558 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev); |
1da177e4 LT |
559 | if (inode) { |
560 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
561 | d_instantiate(dentry, inode); | |
562 | dget(dentry); /* Extra count - pin the dentry in core */ | |
563 | error = 0; | |
564 | } | |
565 | return error; | |
566 | } | |
567 | ||
568 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
569 | { | |
570 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
571 | if (!retval) | |
d8c76e6f | 572 | inc_nlink(dir); |
1da177e4 LT |
573 | return retval; |
574 | } | |
575 | ||
576 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) | |
577 | { | |
578 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
579 | } | |
580 | ||
581 | static int hugetlbfs_symlink(struct inode *dir, | |
582 | struct dentry *dentry, const char *symname) | |
583 | { | |
584 | struct inode *inode; | |
585 | int error = -ENOSPC; | |
586 | gid_t gid; | |
587 | ||
588 | if (dir->i_mode & S_ISGID) | |
589 | gid = dir->i_gid; | |
590 | else | |
77c70de1 | 591 | gid = current_fsgid(); |
1da177e4 | 592 | |
77c70de1 | 593 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), |
1da177e4 LT |
594 | gid, S_IFLNK|S_IRWXUGO, 0); |
595 | if (inode) { | |
596 | int l = strlen(symname)+1; | |
597 | error = page_symlink(inode, symname, l); | |
598 | if (!error) { | |
599 | d_instantiate(dentry, inode); | |
600 | dget(dentry); | |
601 | } else | |
602 | iput(inode); | |
603 | } | |
604 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
605 | ||
606 | return error; | |
607 | } | |
608 | ||
609 | /* | |
6649a386 | 610 | * mark the head page dirty |
1da177e4 LT |
611 | */ |
612 | static int hugetlbfs_set_page_dirty(struct page *page) | |
613 | { | |
d85f3385 | 614 | struct page *head = compound_head(page); |
6649a386 KC |
615 | |
616 | SetPageDirty(head); | |
1da177e4 LT |
617 | return 0; |
618 | } | |
619 | ||
726c3342 | 620 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 621 | { |
726c3342 | 622 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 623 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
624 | |
625 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 626 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
627 | if (sbinfo) { |
628 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
629 | /* If no limits set, just report 0 for max/free/used |
630 | * blocks, like simple_statfs() */ | |
631 | if (sbinfo->max_blocks >= 0) { | |
632 | buf->f_blocks = sbinfo->max_blocks; | |
633 | buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; | |
634 | buf->f_files = sbinfo->max_inodes; | |
635 | buf->f_ffree = sbinfo->free_inodes; | |
636 | } | |
1da177e4 LT |
637 | spin_unlock(&sbinfo->stat_lock); |
638 | } | |
639 | buf->f_namelen = NAME_MAX; | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static void hugetlbfs_put_super(struct super_block *sb) | |
644 | { | |
645 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
646 | ||
647 | if (sbi) { | |
648 | sb->s_fs_info = NULL; | |
649 | kfree(sbi); | |
650 | } | |
651 | } | |
652 | ||
96527980 CH |
653 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
654 | { | |
655 | if (sbinfo->free_inodes >= 0) { | |
656 | spin_lock(&sbinfo->stat_lock); | |
657 | if (unlikely(!sbinfo->free_inodes)) { | |
658 | spin_unlock(&sbinfo->stat_lock); | |
659 | return 0; | |
660 | } | |
661 | sbinfo->free_inodes--; | |
662 | spin_unlock(&sbinfo->stat_lock); | |
663 | } | |
664 | ||
665 | return 1; | |
666 | } | |
667 | ||
668 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
669 | { | |
670 | if (sbinfo->free_inodes >= 0) { | |
671 | spin_lock(&sbinfo->stat_lock); | |
672 | sbinfo->free_inodes++; | |
673 | spin_unlock(&sbinfo->stat_lock); | |
674 | } | |
675 | } | |
676 | ||
677 | ||
e18b890b | 678 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
679 | |
680 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
681 | { | |
96527980 | 682 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
683 | struct hugetlbfs_inode_info *p; |
684 | ||
96527980 CH |
685 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
686 | return NULL; | |
e94b1766 | 687 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
688 | if (unlikely(!p)) { |
689 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 690 | return NULL; |
96527980 | 691 | } |
1da177e4 LT |
692 | return &p->vfs_inode; |
693 | } | |
694 | ||
1da177e4 LT |
695 | static void hugetlbfs_destroy_inode(struct inode *inode) |
696 | { | |
96527980 | 697 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 LT |
698 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
699 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); | |
700 | } | |
701 | ||
f5e54d6e | 702 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
703 | .write_begin = hugetlbfs_write_begin, |
704 | .write_end = hugetlbfs_write_end, | |
1da177e4 LT |
705 | .set_page_dirty = hugetlbfs_set_page_dirty, |
706 | }; | |
707 | ||
96527980 | 708 | |
51cc5068 | 709 | static void init_once(void *foo) |
96527980 CH |
710 | { |
711 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
712 | ||
a35afb83 | 713 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
714 | } |
715 | ||
4b6f5d20 | 716 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 717 | .read = hugetlbfs_read, |
1da177e4 LT |
718 | .mmap = hugetlbfs_file_mmap, |
719 | .fsync = simple_sync_file, | |
720 | .get_unmapped_area = hugetlb_get_unmapped_area, | |
721 | }; | |
722 | ||
92e1d5be | 723 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
724 | .create = hugetlbfs_create, |
725 | .lookup = simple_lookup, | |
726 | .link = simple_link, | |
727 | .unlink = simple_unlink, | |
728 | .symlink = hugetlbfs_symlink, | |
729 | .mkdir = hugetlbfs_mkdir, | |
730 | .rmdir = simple_rmdir, | |
731 | .mknod = hugetlbfs_mknod, | |
732 | .rename = simple_rename, | |
733 | .setattr = hugetlbfs_setattr, | |
734 | }; | |
735 | ||
92e1d5be | 736 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
737 | .setattr = hugetlbfs_setattr, |
738 | }; | |
739 | ||
ee9b6d61 | 740 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
741 | .alloc_inode = hugetlbfs_alloc_inode, |
742 | .destroy_inode = hugetlbfs_destroy_inode, | |
743 | .statfs = hugetlbfs_statfs, | |
149f4211 | 744 | .delete_inode = hugetlbfs_delete_inode, |
1da177e4 LT |
745 | .drop_inode = hugetlbfs_drop_inode, |
746 | .put_super = hugetlbfs_put_super, | |
10f19a86 | 747 | .show_options = generic_show_options, |
1da177e4 LT |
748 | }; |
749 | ||
750 | static int | |
751 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
752 | { | |
e73a75fa RD |
753 | char *p, *rest; |
754 | substring_t args[MAX_OPT_ARGS]; | |
755 | int option; | |
a137e1cc AK |
756 | unsigned long long size = 0; |
757 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
758 | |
759 | if (!options) | |
760 | return 0; | |
1da177e4 | 761 | |
e73a75fa RD |
762 | while ((p = strsep(&options, ",")) != NULL) { |
763 | int token; | |
b4c07bce LS |
764 | if (!*p) |
765 | continue; | |
e73a75fa RD |
766 | |
767 | token = match_token(p, tokens, args); | |
768 | switch (token) { | |
769 | case Opt_uid: | |
770 | if (match_int(&args[0], &option)) | |
771 | goto bad_val; | |
772 | pconfig->uid = option; | |
773 | break; | |
774 | ||
775 | case Opt_gid: | |
776 | if (match_int(&args[0], &option)) | |
777 | goto bad_val; | |
778 | pconfig->gid = option; | |
779 | break; | |
780 | ||
781 | case Opt_mode: | |
782 | if (match_octal(&args[0], &option)) | |
783 | goto bad_val; | |
75897d60 | 784 | pconfig->mode = option & 01777U; |
e73a75fa RD |
785 | break; |
786 | ||
787 | case Opt_size: { | |
e73a75fa RD |
788 | /* memparse() will accept a K/M/G without a digit */ |
789 | if (!isdigit(*args[0].from)) | |
790 | goto bad_val; | |
791 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
792 | setsize = SIZE_STD; |
793 | if (*rest == '%') | |
794 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
795 | break; |
796 | } | |
1da177e4 | 797 | |
e73a75fa RD |
798 | case Opt_nr_inodes: |
799 | /* memparse() will accept a K/M/G without a digit */ | |
800 | if (!isdigit(*args[0].from)) | |
801 | goto bad_val; | |
802 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
803 | break; | |
804 | ||
a137e1cc AK |
805 | case Opt_pagesize: { |
806 | unsigned long ps; | |
807 | ps = memparse(args[0].from, &rest); | |
808 | pconfig->hstate = size_to_hstate(ps); | |
809 | if (!pconfig->hstate) { | |
810 | printk(KERN_ERR | |
811 | "hugetlbfs: Unsupported page size %lu MB\n", | |
812 | ps >> 20); | |
813 | return -EINVAL; | |
814 | } | |
815 | break; | |
816 | } | |
817 | ||
e73a75fa | 818 | default: |
b4c07bce LS |
819 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
820 | p); | |
821 | return -EINVAL; | |
e73a75fa RD |
822 | break; |
823 | } | |
1da177e4 | 824 | } |
a137e1cc AK |
825 | |
826 | /* Do size after hstate is set up */ | |
827 | if (setsize > NO_SIZE) { | |
828 | struct hstate *h = pconfig->hstate; | |
829 | if (setsize == SIZE_PERCENT) { | |
830 | size <<= huge_page_shift(h); | |
831 | size *= h->max_huge_pages; | |
832 | do_div(size, 100); | |
833 | } | |
834 | pconfig->nr_blocks = (size >> huge_page_shift(h)); | |
835 | } | |
836 | ||
1da177e4 | 837 | return 0; |
e73a75fa RD |
838 | |
839 | bad_val: | |
840 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", | |
841 | args[0].from, p); | |
c12ddba0 | 842 | return -EINVAL; |
1da177e4 LT |
843 | } |
844 | ||
845 | static int | |
846 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
847 | { | |
848 | struct inode * inode; | |
849 | struct dentry * root; | |
850 | int ret; | |
851 | struct hugetlbfs_config config; | |
852 | struct hugetlbfs_sb_info *sbinfo; | |
853 | ||
10f19a86 MS |
854 | save_mount_options(sb, data); |
855 | ||
1da177e4 LT |
856 | config.nr_blocks = -1; /* No limit on size by default */ |
857 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
858 | config.uid = current_fsuid(); |
859 | config.gid = current_fsgid(); | |
1da177e4 | 860 | config.mode = 0755; |
a137e1cc | 861 | config.hstate = &default_hstate; |
1da177e4 | 862 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
863 | if (ret) |
864 | return ret; | |
865 | ||
866 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
867 | if (!sbinfo) | |
868 | return -ENOMEM; | |
869 | sb->s_fs_info = sbinfo; | |
a137e1cc | 870 | sbinfo->hstate = config.hstate; |
1da177e4 LT |
871 | spin_lock_init(&sbinfo->stat_lock); |
872 | sbinfo->max_blocks = config.nr_blocks; | |
873 | sbinfo->free_blocks = config.nr_blocks; | |
874 | sbinfo->max_inodes = config.nr_inodes; | |
875 | sbinfo->free_inodes = config.nr_inodes; | |
876 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
a137e1cc AK |
877 | sb->s_blocksize = huge_page_size(config.hstate); |
878 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
879 | sb->s_magic = HUGETLBFS_MAGIC; |
880 | sb->s_op = &hugetlbfs_ops; | |
881 | sb->s_time_gran = 1; | |
882 | inode = hugetlbfs_get_inode(sb, config.uid, config.gid, | |
883 | S_IFDIR | config.mode, 0); | |
884 | if (!inode) | |
885 | goto out_free; | |
886 | ||
887 | root = d_alloc_root(inode); | |
888 | if (!root) { | |
889 | iput(inode); | |
890 | goto out_free; | |
891 | } | |
892 | sb->s_root = root; | |
893 | return 0; | |
894 | out_free: | |
895 | kfree(sbinfo); | |
896 | return -ENOMEM; | |
897 | } | |
898 | ||
9a119c05 | 899 | int hugetlb_get_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
900 | { |
901 | int ret = 0; | |
902 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
903 | ||
904 | if (sbinfo->free_blocks > -1) { | |
905 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 AL |
906 | if (sbinfo->free_blocks - delta >= 0) |
907 | sbinfo->free_blocks -= delta; | |
1da177e4 LT |
908 | else |
909 | ret = -ENOMEM; | |
910 | spin_unlock(&sbinfo->stat_lock); | |
911 | } | |
912 | ||
913 | return ret; | |
914 | } | |
915 | ||
9a119c05 | 916 | void hugetlb_put_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
917 | { |
918 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
919 | ||
920 | if (sbinfo->free_blocks > -1) { | |
921 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 | 922 | sbinfo->free_blocks += delta; |
1da177e4 LT |
923 | spin_unlock(&sbinfo->stat_lock); |
924 | } | |
925 | } | |
926 | ||
454e2398 DH |
927 | static int hugetlbfs_get_sb(struct file_system_type *fs_type, |
928 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 929 | { |
454e2398 | 930 | return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); |
1da177e4 LT |
931 | } |
932 | ||
933 | static struct file_system_type hugetlbfs_fs_type = { | |
934 | .name = "hugetlbfs", | |
935 | .get_sb = hugetlbfs_get_sb, | |
936 | .kill_sb = kill_litter_super, | |
937 | }; | |
938 | ||
939 | static struct vfsmount *hugetlbfs_vfsmount; | |
940 | ||
6bfde05b | 941 | static int can_do_hugetlb_shm(int creat_flags) |
1da177e4 | 942 | { |
6bfde05b EM |
943 | if (creat_flags != HUGETLB_SHMFS_INODE) |
944 | return 0; | |
945 | if (capable(CAP_IPC_LOCK)) | |
946 | return 1; | |
947 | if (in_group_p(sysctl_hugetlb_shm_group)) | |
948 | return 1; | |
949 | return 0; | |
1da177e4 LT |
950 | } |
951 | ||
353d5c30 | 952 | struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag, |
6bfde05b | 953 | struct user_struct **user, int creat_flags) |
1da177e4 LT |
954 | { |
955 | int error = -ENOMEM; | |
956 | struct file *file; | |
957 | struct inode *inode; | |
958 | struct dentry *dentry, *root; | |
959 | struct qstr quick_string; | |
1da177e4 | 960 | |
353d5c30 | 961 | *user = NULL; |
5bc98594 AM |
962 | if (!hugetlbfs_vfsmount) |
963 | return ERR_PTR(-ENOENT); | |
964 | ||
6bfde05b | 965 | if (!can_do_hugetlb_shm(creat_flags)) { |
353d5c30 HD |
966 | *user = current_user(); |
967 | if (user_shm_lock(size, *user)) { | |
2584e517 RT |
968 | WARN_ONCE(1, |
969 | "Using mlock ulimits for SHM_HUGETLB deprecated\n"); | |
353d5c30 HD |
970 | } else { |
971 | *user = NULL; | |
2584e517 | 972 | return ERR_PTR(-EPERM); |
353d5c30 | 973 | } |
2584e517 | 974 | } |
1da177e4 | 975 | |
1da177e4 | 976 | root = hugetlbfs_vfsmount->mnt_root; |
9d66586f | 977 | quick_string.name = name; |
1da177e4 LT |
978 | quick_string.len = strlen(quick_string.name); |
979 | quick_string.hash = 0; | |
980 | dentry = d_alloc(root, &quick_string); | |
981 | if (!dentry) | |
982 | goto out_shm_unlock; | |
983 | ||
1da177e4 | 984 | error = -ENOSPC; |
77c70de1 DH |
985 | inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(), |
986 | current_fsgid(), S_IFREG | S_IRWXUGO, 0); | |
1da177e4 | 987 | if (!inode) |
ce8d2cdf | 988 | goto out_dentry; |
1da177e4 | 989 | |
b45b5bd6 | 990 | error = -ENOMEM; |
a5516438 | 991 | if (hugetlb_reserve_pages(inode, 0, |
5a6fe125 MG |
992 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
993 | acctflag)) | |
b45b5bd6 DG |
994 | goto out_inode; |
995 | ||
1da177e4 LT |
996 | d_instantiate(dentry, inode); |
997 | inode->i_size = size; | |
998 | inode->i_nlink = 0; | |
ce8d2cdf DH |
999 | |
1000 | error = -ENFILE; | |
1001 | file = alloc_file(hugetlbfs_vfsmount, dentry, | |
1002 | FMODE_WRITE | FMODE_READ, | |
1003 | &hugetlbfs_file_operations); | |
1004 | if (!file) | |
b4d232e6 | 1005 | goto out_dentry; /* inode is already attached */ |
c9d9ac52 | 1006 | ima_counts_get(file); |
ce8d2cdf | 1007 | |
1da177e4 LT |
1008 | return file; |
1009 | ||
b45b5bd6 DG |
1010 | out_inode: |
1011 | iput(inode); | |
1da177e4 LT |
1012 | out_dentry: |
1013 | dput(dentry); | |
1014 | out_shm_unlock: | |
353d5c30 HD |
1015 | if (*user) { |
1016 | user_shm_unlock(size, *user); | |
1017 | *user = NULL; | |
1018 | } | |
1da177e4 LT |
1019 | return ERR_PTR(error); |
1020 | } | |
1021 | ||
1022 | static int __init init_hugetlbfs_fs(void) | |
1023 | { | |
1024 | int error; | |
1025 | struct vfsmount *vfsmount; | |
1026 | ||
e0bf68dd PZ |
1027 | error = bdi_init(&hugetlbfs_backing_dev_info); |
1028 | if (error) | |
1029 | return error; | |
1030 | ||
1da177e4 LT |
1031 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1032 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 1033 | 0, 0, init_once); |
1da177e4 | 1034 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1035 | goto out2; |
1da177e4 LT |
1036 | |
1037 | error = register_filesystem(&hugetlbfs_fs_type); | |
1038 | if (error) | |
1039 | goto out; | |
1040 | ||
1041 | vfsmount = kern_mount(&hugetlbfs_fs_type); | |
1042 | ||
1043 | if (!IS_ERR(vfsmount)) { | |
1044 | hugetlbfs_vfsmount = vfsmount; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | error = PTR_ERR(vfsmount); | |
1049 | ||
1050 | out: | |
1051 | if (error) | |
1052 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
e0bf68dd PZ |
1053 | out2: |
1054 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1055 | return error; |
1056 | } | |
1057 | ||
1058 | static void __exit exit_hugetlbfs_fs(void) | |
1059 | { | |
1060 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
1061 | unregister_filesystem(&hugetlbfs_fs_type); | |
e0bf68dd | 1062 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | module_init(init_hugetlbfs_fs) | |
1066 | module_exit(exit_hugetlbfs_fs) | |
1067 | ||
1068 | MODULE_LICENSE("GPL"); |