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/quotaops.h> |
30 | #include <linux/slab.h> | |
31 | #include <linux/dnotify.h> | |
32 | #include <linux/statfs.h> | |
33 | #include <linux/security.h> | |
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 = { | |
47 | .ra_pages = 0, /* No readahead */ | |
e4ad08fe | 48 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
1da177e4 LT |
49 | }; |
50 | ||
51 | int sysctl_hugetlb_shm_group; | |
52 | ||
e73a75fa RD |
53 | enum { |
54 | Opt_size, Opt_nr_inodes, | |
55 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 56 | Opt_pagesize, |
e73a75fa RD |
57 | Opt_err, |
58 | }; | |
59 | ||
a447c093 | 60 | static const match_table_t tokens = { |
e73a75fa RD |
61 | {Opt_size, "size=%s"}, |
62 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
63 | {Opt_mode, "mode=%o"}, | |
64 | {Opt_uid, "uid=%u"}, | |
65 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 66 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
67 | {Opt_err, NULL}, |
68 | }; | |
69 | ||
2e9b367c AL |
70 | static void huge_pagevec_release(struct pagevec *pvec) |
71 | { | |
72 | int i; | |
73 | ||
74 | for (i = 0; i < pagevec_count(pvec); ++i) | |
75 | put_page(pvec->pages[i]); | |
76 | ||
77 | pagevec_reinit(pvec); | |
78 | } | |
79 | ||
1da177e4 LT |
80 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
81 | { | |
b39424e2 | 82 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
83 | loff_t len, vma_len; |
84 | int ret; | |
a5516438 | 85 | struct hstate *h = hstate_file(file); |
1da177e4 | 86 | |
68589bc3 | 87 | /* |
dec4ad86 DG |
88 | * vma address alignment (but not the pgoff alignment) has |
89 | * already been checked by prepare_hugepage_range. If you add | |
90 | * any error returns here, do so after setting VM_HUGETLB, so | |
91 | * is_vm_hugetlb_page tests below unmap_region go the right | |
92 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
93 | * and ia64). | |
68589bc3 HD |
94 | */ |
95 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; | |
96 | vma->vm_ops = &hugetlb_vm_ops; | |
1da177e4 | 97 | |
a5516438 | 98 | if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
99 | return -EINVAL; |
100 | ||
1da177e4 LT |
101 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
102 | ||
1b1dcc1b | 103 | mutex_lock(&inode->i_mutex); |
1da177e4 | 104 | file_accessed(file); |
1da177e4 LT |
105 | |
106 | ret = -ENOMEM; | |
107 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 108 | |
a1e78772 | 109 | if (hugetlb_reserve_pages(inode, |
a5516438 | 110 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
111 | len >> huge_page_shift(h), vma, |
112 | vma->vm_flags)) | |
a43a8c39 | 113 | goto out; |
b45b5bd6 | 114 | |
4c887265 AL |
115 | ret = 0; |
116 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 117 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
118 | inode->i_size = len; |
119 | out: | |
1b1dcc1b | 120 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
121 | |
122 | return ret; | |
123 | } | |
124 | ||
125 | /* | |
508034a3 | 126 | * Called under down_write(mmap_sem). |
1da177e4 LT |
127 | */ |
128 | ||
d2ba27e8 | 129 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
130 | static unsigned long |
131 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
132 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
133 | { | |
134 | struct mm_struct *mm = current->mm; | |
135 | struct vm_area_struct *vma; | |
136 | unsigned long start_addr; | |
a5516438 | 137 | struct hstate *h = hstate_file(file); |
1da177e4 | 138 | |
a5516438 | 139 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
140 | return -EINVAL; |
141 | if (len > TASK_SIZE) | |
142 | return -ENOMEM; | |
143 | ||
036e0856 | 144 | if (flags & MAP_FIXED) { |
a5516438 | 145 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
146 | return -EINVAL; |
147 | return addr; | |
148 | } | |
149 | ||
1da177e4 | 150 | if (addr) { |
a5516438 | 151 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
152 | vma = find_vma(mm, addr); |
153 | if (TASK_SIZE - len >= addr && | |
154 | (!vma || addr + len <= vma->vm_start)) | |
155 | return addr; | |
156 | } | |
157 | ||
158 | start_addr = mm->free_area_cache; | |
159 | ||
1363c3cd WW |
160 | if (len <= mm->cached_hole_size) |
161 | start_addr = TASK_UNMAPPED_BASE; | |
162 | ||
1da177e4 | 163 | full_search: |
a5516438 | 164 | addr = ALIGN(start_addr, huge_page_size(h)); |
1da177e4 LT |
165 | |
166 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |
167 | /* At this point: (!vma || addr < vma->vm_end). */ | |
168 | if (TASK_SIZE - len < addr) { | |
169 | /* | |
170 | * Start a new search - just in case we missed | |
171 | * some holes. | |
172 | */ | |
173 | if (start_addr != TASK_UNMAPPED_BASE) { | |
174 | start_addr = TASK_UNMAPPED_BASE; | |
175 | goto full_search; | |
176 | } | |
177 | return -ENOMEM; | |
178 | } | |
179 | ||
180 | if (!vma || addr + len <= vma->vm_start) | |
181 | return addr; | |
a5516438 | 182 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
1da177e4 LT |
183 | } |
184 | } | |
185 | #endif | |
186 | ||
e63e1e5a BP |
187 | static int |
188 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
189 | char __user *buf, unsigned long count, | |
190 | unsigned long size) | |
191 | { | |
192 | char *kaddr; | |
193 | unsigned long left, copied = 0; | |
194 | int i, chunksize; | |
195 | ||
196 | if (size > count) | |
197 | size = count; | |
198 | ||
199 | /* Find which 4k chunk and offset with in that chunk */ | |
200 | i = offset >> PAGE_CACHE_SHIFT; | |
201 | offset = offset & ~PAGE_CACHE_MASK; | |
202 | ||
203 | while (size) { | |
204 | chunksize = PAGE_CACHE_SIZE; | |
205 | if (offset) | |
206 | chunksize -= offset; | |
207 | if (chunksize > size) | |
208 | chunksize = size; | |
209 | kaddr = kmap(&page[i]); | |
210 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
211 | kunmap(&page[i]); | |
212 | if (left) { | |
213 | copied += (chunksize - left); | |
214 | break; | |
215 | } | |
216 | offset = 0; | |
217 | size -= chunksize; | |
218 | buf += chunksize; | |
219 | copied += chunksize; | |
220 | i++; | |
221 | } | |
222 | return copied ? copied : -EFAULT; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Support for read() - Find the page attached to f_mapping and copy out the | |
227 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
228 | * since it has PAGE_CACHE_SIZE assumptions. | |
229 | */ | |
230 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
231 | size_t len, loff_t *ppos) | |
232 | { | |
a5516438 | 233 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
234 | struct address_space *mapping = filp->f_mapping; |
235 | struct inode *inode = mapping->host; | |
a5516438 AK |
236 | unsigned long index = *ppos >> huge_page_shift(h); |
237 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
238 | unsigned long end_index; |
239 | loff_t isize; | |
240 | ssize_t retval = 0; | |
241 | ||
242 | mutex_lock(&inode->i_mutex); | |
243 | ||
244 | /* validate length */ | |
245 | if (len == 0) | |
246 | goto out; | |
247 | ||
248 | isize = i_size_read(inode); | |
249 | if (!isize) | |
250 | goto out; | |
251 | ||
a5516438 | 252 | end_index = (isize - 1) >> huge_page_shift(h); |
e63e1e5a BP |
253 | for (;;) { |
254 | struct page *page; | |
a5516438 | 255 | unsigned long nr, ret; |
91bf189c | 256 | int ra; |
e63e1e5a BP |
257 | |
258 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 259 | nr = huge_page_size(h); |
e63e1e5a BP |
260 | if (index >= end_index) { |
261 | if (index > end_index) | |
262 | goto out; | |
a5516438 | 263 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
e63e1e5a BP |
264 | if (nr <= offset) { |
265 | goto out; | |
266 | } | |
267 | } | |
268 | nr = nr - offset; | |
269 | ||
270 | /* Find the page */ | |
271 | page = find_get_page(mapping, index); | |
272 | if (unlikely(page == NULL)) { | |
273 | /* | |
274 | * We have a HOLE, zero out the user-buffer for the | |
275 | * length of the hole or request. | |
276 | */ | |
277 | ret = len < nr ? len : nr; | |
278 | if (clear_user(buf, ret)) | |
91bf189c RK |
279 | ra = -EFAULT; |
280 | else | |
281 | ra = 0; | |
e63e1e5a BP |
282 | } else { |
283 | /* | |
284 | * We have the page, copy it to user space buffer. | |
285 | */ | |
91bf189c RK |
286 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
287 | ret = ra; | |
e63e1e5a | 288 | } |
91bf189c | 289 | if (ra < 0) { |
e63e1e5a | 290 | if (retval == 0) |
91bf189c | 291 | retval = ra; |
e63e1e5a BP |
292 | if (page) |
293 | page_cache_release(page); | |
294 | goto out; | |
295 | } | |
296 | ||
297 | offset += ret; | |
298 | retval += ret; | |
299 | len -= ret; | |
a5516438 AK |
300 | index += offset >> huge_page_shift(h); |
301 | offset &= ~huge_page_mask(h); | |
e63e1e5a BP |
302 | |
303 | if (page) | |
304 | page_cache_release(page); | |
305 | ||
306 | /* short read or no more work */ | |
307 | if ((ret != nr) || (len == 0)) | |
308 | break; | |
309 | } | |
310 | out: | |
a5516438 | 311 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
312 | mutex_unlock(&inode->i_mutex); |
313 | return retval; | |
314 | } | |
315 | ||
1da177e4 LT |
316 | /* |
317 | * Read a page. Again trivial. If it didn't already exist | |
318 | * in the page cache, it is zero-filled. | |
319 | */ | |
320 | static int hugetlbfs_readpage(struct file *file, struct page * page) | |
321 | { | |
322 | unlock_page(page); | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
800d15a5 NP |
326 | static int hugetlbfs_write_begin(struct file *file, |
327 | struct address_space *mapping, | |
328 | loff_t pos, unsigned len, unsigned flags, | |
329 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
330 | { |
331 | return -EINVAL; | |
332 | } | |
333 | ||
800d15a5 NP |
334 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
335 | loff_t pos, unsigned len, unsigned copied, | |
336 | struct page *page, void *fsdata) | |
1da177e4 | 337 | { |
800d15a5 | 338 | BUG(); |
1da177e4 LT |
339 | return -EINVAL; |
340 | } | |
341 | ||
1da177e4 LT |
342 | static void truncate_huge_page(struct page *page) |
343 | { | |
fba2591b | 344 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 LT |
345 | ClearPageUptodate(page); |
346 | remove_from_page_cache(page); | |
347 | put_page(page); | |
348 | } | |
349 | ||
b45b5bd6 | 350 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 351 | { |
a5516438 | 352 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 353 | struct address_space *mapping = &inode->i_data; |
a5516438 | 354 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
355 | struct pagevec pvec; |
356 | pgoff_t next; | |
a43a8c39 | 357 | int i, freed = 0; |
1da177e4 LT |
358 | |
359 | pagevec_init(&pvec, 0); | |
360 | next = start; | |
361 | while (1) { | |
362 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
363 | if (next == start) | |
364 | break; | |
365 | next = start; | |
366 | continue; | |
367 | } | |
368 | ||
369 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
370 | struct page *page = pvec.pages[i]; | |
371 | ||
372 | lock_page(page); | |
373 | if (page->index > next) | |
374 | next = page->index; | |
375 | ++next; | |
376 | truncate_huge_page(page); | |
377 | unlock_page(page); | |
a43a8c39 | 378 | freed++; |
1da177e4 LT |
379 | } |
380 | huge_pagevec_release(&pvec); | |
381 | } | |
382 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 383 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
384 | } |
385 | ||
386 | static void hugetlbfs_delete_inode(struct inode *inode) | |
387 | { | |
b45b5bd6 | 388 | truncate_hugepages(inode, 0); |
149f4211 CH |
389 | clear_inode(inode); |
390 | } | |
391 | ||
ddc0a51d | 392 | static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock) |
1da177e4 | 393 | { |
0b1533f6 CH |
394 | struct super_block *sb = inode->i_sb; |
395 | ||
396 | if (!hlist_unhashed(&inode->i_hash)) { | |
1c0eeaf5 | 397 | if (!(inode->i_state & (I_DIRTY|I_SYNC))) |
0b1533f6 CH |
398 | list_move(&inode->i_list, &inode_unused); |
399 | inodes_stat.nr_unused++; | |
400 | if (!sb || (sb->s_flags & MS_ACTIVE)) { | |
401 | spin_unlock(&inode_lock); | |
402 | return; | |
403 | } | |
404 | inode->i_state |= I_WILL_FREE; | |
1da177e4 | 405 | spin_unlock(&inode_lock); |
0b1533f6 CH |
406 | /* |
407 | * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK | |
408 | * in our backing_dev_info. | |
409 | */ | |
410 | write_inode_now(inode, 1); | |
411 | spin_lock(&inode_lock); | |
412 | inode->i_state &= ~I_WILL_FREE; | |
413 | inodes_stat.nr_unused--; | |
414 | hlist_del_init(&inode->i_hash); | |
1da177e4 | 415 | } |
1da177e4 LT |
416 | list_del_init(&inode->i_list); |
417 | list_del_init(&inode->i_sb_list); | |
418 | inode->i_state |= I_FREEING; | |
419 | inodes_stat.nr_inodes--; | |
420 | spin_unlock(&inode_lock); | |
b45b5bd6 | 421 | truncate_hugepages(inode, 0); |
1da177e4 LT |
422 | clear_inode(inode); |
423 | destroy_inode(inode); | |
424 | } | |
425 | ||
426 | static void hugetlbfs_drop_inode(struct inode *inode) | |
427 | { | |
428 | if (!inode->i_nlink) | |
6b09b9df | 429 | generic_delete_inode(inode); |
1da177e4 LT |
430 | else |
431 | hugetlbfs_forget_inode(inode); | |
432 | } | |
433 | ||
1da177e4 | 434 | static inline void |
856fc295 | 435 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
1da177e4 LT |
436 | { |
437 | struct vm_area_struct *vma; | |
438 | struct prio_tree_iter iter; | |
439 | ||
856fc295 | 440 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
441 | unsigned long v_offset; |
442 | ||
1da177e4 | 443 | /* |
856fc295 HD |
444 | * Can the expression below overflow on 32-bit arches? |
445 | * No, because the prio_tree returns us only those vmas | |
446 | * which overlap the truncated area starting at pgoff, | |
447 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 448 | */ |
856fc295 HD |
449 | if (vma->vm_pgoff < pgoff) |
450 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
451 | else | |
1da177e4 LT |
452 | v_offset = 0; |
453 | ||
502717f4 | 454 | __unmap_hugepage_range(vma, |
04f2cbe3 | 455 | vma->vm_start + v_offset, vma->vm_end, NULL); |
1da177e4 LT |
456 | } |
457 | } | |
458 | ||
1da177e4 LT |
459 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
460 | { | |
856fc295 | 461 | pgoff_t pgoff; |
1da177e4 | 462 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 463 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 464 | |
a5516438 | 465 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 466 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 467 | |
7aa91e10 | 468 | i_size_write(inode, offset); |
1da177e4 LT |
469 | spin_lock(&mapping->i_mmap_lock); |
470 | if (!prio_tree_empty(&mapping->i_mmap)) | |
471 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); | |
472 | spin_unlock(&mapping->i_mmap_lock); | |
b45b5bd6 | 473 | truncate_hugepages(inode, offset); |
1da177e4 LT |
474 | return 0; |
475 | } | |
476 | ||
477 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
478 | { | |
479 | struct inode *inode = dentry->d_inode; | |
a5516438 | 480 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
481 | int error; |
482 | unsigned int ia_valid = attr->ia_valid; | |
483 | ||
484 | BUG_ON(!inode); | |
485 | ||
486 | error = inode_change_ok(inode, attr); | |
487 | if (error) | |
488 | goto out; | |
489 | ||
490 | if (ia_valid & ATTR_SIZE) { | |
491 | error = -EINVAL; | |
a5516438 | 492 | if (!(attr->ia_size & ~huge_page_mask(h))) |
1da177e4 LT |
493 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
494 | if (error) | |
495 | goto out; | |
496 | attr->ia_valid &= ~ATTR_SIZE; | |
497 | } | |
498 | error = inode_setattr(inode, attr); | |
499 | out: | |
500 | return error; | |
501 | } | |
502 | ||
503 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, | |
504 | gid_t gid, int mode, dev_t dev) | |
505 | { | |
506 | struct inode *inode; | |
1da177e4 LT |
507 | |
508 | inode = new_inode(sb); | |
509 | if (inode) { | |
510 | struct hugetlbfs_inode_info *info; | |
511 | inode->i_mode = mode; | |
512 | inode->i_uid = uid; | |
513 | inode->i_gid = gid; | |
1da177e4 LT |
514 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
515 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
516 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a43a8c39 | 517 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
1da177e4 | 518 | info = HUGETLBFS_I(inode); |
71fe804b | 519 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
520 | switch (mode & S_IFMT) { |
521 | default: | |
522 | init_special_inode(inode, mode, dev); | |
523 | break; | |
524 | case S_IFREG: | |
525 | inode->i_op = &hugetlbfs_inode_operations; | |
526 | inode->i_fop = &hugetlbfs_file_operations; | |
527 | break; | |
528 | case S_IFDIR: | |
529 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
530 | inode->i_fop = &simple_dir_operations; | |
531 | ||
532 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 533 | inc_nlink(inode); |
1da177e4 LT |
534 | break; |
535 | case S_IFLNK: | |
536 | inode->i_op = &page_symlink_inode_operations; | |
537 | break; | |
538 | } | |
539 | } | |
540 | return inode; | |
541 | } | |
542 | ||
543 | /* | |
544 | * File creation. Allocate an inode, and we're done.. | |
545 | */ | |
546 | static int hugetlbfs_mknod(struct inode *dir, | |
547 | struct dentry *dentry, int mode, dev_t dev) | |
548 | { | |
549 | struct inode *inode; | |
550 | int error = -ENOSPC; | |
551 | gid_t gid; | |
552 | ||
553 | if (dir->i_mode & S_ISGID) { | |
554 | gid = dir->i_gid; | |
555 | if (S_ISDIR(mode)) | |
556 | mode |= S_ISGID; | |
557 | } else { | |
77c70de1 | 558 | gid = current_fsgid(); |
1da177e4 | 559 | } |
77c70de1 | 560 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev); |
1da177e4 LT |
561 | if (inode) { |
562 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
563 | d_instantiate(dentry, inode); | |
564 | dget(dentry); /* Extra count - pin the dentry in core */ | |
565 | error = 0; | |
566 | } | |
567 | return error; | |
568 | } | |
569 | ||
570 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
571 | { | |
572 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
573 | if (!retval) | |
d8c76e6f | 574 | inc_nlink(dir); |
1da177e4 LT |
575 | return retval; |
576 | } | |
577 | ||
578 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) | |
579 | { | |
580 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
581 | } | |
582 | ||
583 | static int hugetlbfs_symlink(struct inode *dir, | |
584 | struct dentry *dentry, const char *symname) | |
585 | { | |
586 | struct inode *inode; | |
587 | int error = -ENOSPC; | |
588 | gid_t gid; | |
589 | ||
590 | if (dir->i_mode & S_ISGID) | |
591 | gid = dir->i_gid; | |
592 | else | |
77c70de1 | 593 | gid = current_fsgid(); |
1da177e4 | 594 | |
77c70de1 | 595 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), |
1da177e4 LT |
596 | gid, S_IFLNK|S_IRWXUGO, 0); |
597 | if (inode) { | |
598 | int l = strlen(symname)+1; | |
599 | error = page_symlink(inode, symname, l); | |
600 | if (!error) { | |
601 | d_instantiate(dentry, inode); | |
602 | dget(dentry); | |
603 | } else | |
604 | iput(inode); | |
605 | } | |
606 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
607 | ||
608 | return error; | |
609 | } | |
610 | ||
611 | /* | |
6649a386 | 612 | * mark the head page dirty |
1da177e4 LT |
613 | */ |
614 | static int hugetlbfs_set_page_dirty(struct page *page) | |
615 | { | |
d85f3385 | 616 | struct page *head = compound_head(page); |
6649a386 KC |
617 | |
618 | SetPageDirty(head); | |
1da177e4 LT |
619 | return 0; |
620 | } | |
621 | ||
726c3342 | 622 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 623 | { |
726c3342 | 624 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 625 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
626 | |
627 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 628 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
629 | if (sbinfo) { |
630 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
631 | /* If no limits set, just report 0 for max/free/used |
632 | * blocks, like simple_statfs() */ | |
633 | if (sbinfo->max_blocks >= 0) { | |
634 | buf->f_blocks = sbinfo->max_blocks; | |
635 | buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; | |
636 | buf->f_files = sbinfo->max_inodes; | |
637 | buf->f_ffree = sbinfo->free_inodes; | |
638 | } | |
1da177e4 LT |
639 | spin_unlock(&sbinfo->stat_lock); |
640 | } | |
641 | buf->f_namelen = NAME_MAX; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | static void hugetlbfs_put_super(struct super_block *sb) | |
646 | { | |
647 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
648 | ||
649 | if (sbi) { | |
650 | sb->s_fs_info = NULL; | |
651 | kfree(sbi); | |
652 | } | |
653 | } | |
654 | ||
96527980 CH |
655 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
656 | { | |
657 | if (sbinfo->free_inodes >= 0) { | |
658 | spin_lock(&sbinfo->stat_lock); | |
659 | if (unlikely(!sbinfo->free_inodes)) { | |
660 | spin_unlock(&sbinfo->stat_lock); | |
661 | return 0; | |
662 | } | |
663 | sbinfo->free_inodes--; | |
664 | spin_unlock(&sbinfo->stat_lock); | |
665 | } | |
666 | ||
667 | return 1; | |
668 | } | |
669 | ||
670 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
671 | { | |
672 | if (sbinfo->free_inodes >= 0) { | |
673 | spin_lock(&sbinfo->stat_lock); | |
674 | sbinfo->free_inodes++; | |
675 | spin_unlock(&sbinfo->stat_lock); | |
676 | } | |
677 | } | |
678 | ||
679 | ||
e18b890b | 680 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
681 | |
682 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
683 | { | |
96527980 | 684 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
685 | struct hugetlbfs_inode_info *p; |
686 | ||
96527980 CH |
687 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
688 | return NULL; | |
e94b1766 | 689 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
690 | if (unlikely(!p)) { |
691 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 692 | return NULL; |
96527980 | 693 | } |
1da177e4 LT |
694 | return &p->vfs_inode; |
695 | } | |
696 | ||
1da177e4 LT |
697 | static void hugetlbfs_destroy_inode(struct inode *inode) |
698 | { | |
96527980 | 699 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 LT |
700 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
701 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); | |
702 | } | |
703 | ||
f5e54d6e | 704 | static const struct address_space_operations hugetlbfs_aops = { |
1da177e4 | 705 | .readpage = hugetlbfs_readpage, |
800d15a5 NP |
706 | .write_begin = hugetlbfs_write_begin, |
707 | .write_end = hugetlbfs_write_end, | |
1da177e4 LT |
708 | .set_page_dirty = hugetlbfs_set_page_dirty, |
709 | }; | |
710 | ||
96527980 | 711 | |
51cc5068 | 712 | static void init_once(void *foo) |
96527980 CH |
713 | { |
714 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
715 | ||
a35afb83 | 716 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
717 | } |
718 | ||
4b6f5d20 | 719 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 720 | .read = hugetlbfs_read, |
1da177e4 LT |
721 | .mmap = hugetlbfs_file_mmap, |
722 | .fsync = simple_sync_file, | |
723 | .get_unmapped_area = hugetlb_get_unmapped_area, | |
724 | }; | |
725 | ||
92e1d5be | 726 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
727 | .create = hugetlbfs_create, |
728 | .lookup = simple_lookup, | |
729 | .link = simple_link, | |
730 | .unlink = simple_unlink, | |
731 | .symlink = hugetlbfs_symlink, | |
732 | .mkdir = hugetlbfs_mkdir, | |
733 | .rmdir = simple_rmdir, | |
734 | .mknod = hugetlbfs_mknod, | |
735 | .rename = simple_rename, | |
736 | .setattr = hugetlbfs_setattr, | |
737 | }; | |
738 | ||
92e1d5be | 739 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
740 | .setattr = hugetlbfs_setattr, |
741 | }; | |
742 | ||
ee9b6d61 | 743 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
744 | .alloc_inode = hugetlbfs_alloc_inode, |
745 | .destroy_inode = hugetlbfs_destroy_inode, | |
746 | .statfs = hugetlbfs_statfs, | |
149f4211 | 747 | .delete_inode = hugetlbfs_delete_inode, |
1da177e4 LT |
748 | .drop_inode = hugetlbfs_drop_inode, |
749 | .put_super = hugetlbfs_put_super, | |
10f19a86 | 750 | .show_options = generic_show_options, |
1da177e4 LT |
751 | }; |
752 | ||
753 | static int | |
754 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
755 | { | |
e73a75fa RD |
756 | char *p, *rest; |
757 | substring_t args[MAX_OPT_ARGS]; | |
758 | int option; | |
a137e1cc AK |
759 | unsigned long long size = 0; |
760 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
761 | |
762 | if (!options) | |
763 | return 0; | |
1da177e4 | 764 | |
e73a75fa RD |
765 | while ((p = strsep(&options, ",")) != NULL) { |
766 | int token; | |
b4c07bce LS |
767 | if (!*p) |
768 | continue; | |
e73a75fa RD |
769 | |
770 | token = match_token(p, tokens, args); | |
771 | switch (token) { | |
772 | case Opt_uid: | |
773 | if (match_int(&args[0], &option)) | |
774 | goto bad_val; | |
775 | pconfig->uid = option; | |
776 | break; | |
777 | ||
778 | case Opt_gid: | |
779 | if (match_int(&args[0], &option)) | |
780 | goto bad_val; | |
781 | pconfig->gid = option; | |
782 | break; | |
783 | ||
784 | case Opt_mode: | |
785 | if (match_octal(&args[0], &option)) | |
786 | goto bad_val; | |
75897d60 | 787 | pconfig->mode = option & 01777U; |
e73a75fa RD |
788 | break; |
789 | ||
790 | case Opt_size: { | |
e73a75fa RD |
791 | /* memparse() will accept a K/M/G without a digit */ |
792 | if (!isdigit(*args[0].from)) | |
793 | goto bad_val; | |
794 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
795 | setsize = SIZE_STD; |
796 | if (*rest == '%') | |
797 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
798 | break; |
799 | } | |
1da177e4 | 800 | |
e73a75fa RD |
801 | case Opt_nr_inodes: |
802 | /* memparse() will accept a K/M/G without a digit */ | |
803 | if (!isdigit(*args[0].from)) | |
804 | goto bad_val; | |
805 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
806 | break; | |
807 | ||
a137e1cc AK |
808 | case Opt_pagesize: { |
809 | unsigned long ps; | |
810 | ps = memparse(args[0].from, &rest); | |
811 | pconfig->hstate = size_to_hstate(ps); | |
812 | if (!pconfig->hstate) { | |
813 | printk(KERN_ERR | |
814 | "hugetlbfs: Unsupported page size %lu MB\n", | |
815 | ps >> 20); | |
816 | return -EINVAL; | |
817 | } | |
818 | break; | |
819 | } | |
820 | ||
e73a75fa | 821 | default: |
b4c07bce LS |
822 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
823 | p); | |
824 | return -EINVAL; | |
e73a75fa RD |
825 | break; |
826 | } | |
1da177e4 | 827 | } |
a137e1cc AK |
828 | |
829 | /* Do size after hstate is set up */ | |
830 | if (setsize > NO_SIZE) { | |
831 | struct hstate *h = pconfig->hstate; | |
832 | if (setsize == SIZE_PERCENT) { | |
833 | size <<= huge_page_shift(h); | |
834 | size *= h->max_huge_pages; | |
835 | do_div(size, 100); | |
836 | } | |
837 | pconfig->nr_blocks = (size >> huge_page_shift(h)); | |
838 | } | |
839 | ||
1da177e4 | 840 | return 0; |
e73a75fa RD |
841 | |
842 | bad_val: | |
843 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", | |
844 | args[0].from, p); | |
845 | return 1; | |
1da177e4 LT |
846 | } |
847 | ||
848 | static int | |
849 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
850 | { | |
851 | struct inode * inode; | |
852 | struct dentry * root; | |
853 | int ret; | |
854 | struct hugetlbfs_config config; | |
855 | struct hugetlbfs_sb_info *sbinfo; | |
856 | ||
10f19a86 MS |
857 | save_mount_options(sb, data); |
858 | ||
1da177e4 LT |
859 | config.nr_blocks = -1; /* No limit on size by default */ |
860 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
861 | config.uid = current_fsuid(); |
862 | config.gid = current_fsgid(); | |
1da177e4 | 863 | config.mode = 0755; |
a137e1cc | 864 | config.hstate = &default_hstate; |
1da177e4 | 865 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
866 | if (ret) |
867 | return ret; | |
868 | ||
869 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
870 | if (!sbinfo) | |
871 | return -ENOMEM; | |
872 | sb->s_fs_info = sbinfo; | |
a137e1cc | 873 | sbinfo->hstate = config.hstate; |
1da177e4 LT |
874 | spin_lock_init(&sbinfo->stat_lock); |
875 | sbinfo->max_blocks = config.nr_blocks; | |
876 | sbinfo->free_blocks = config.nr_blocks; | |
877 | sbinfo->max_inodes = config.nr_inodes; | |
878 | sbinfo->free_inodes = config.nr_inodes; | |
879 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
a137e1cc AK |
880 | sb->s_blocksize = huge_page_size(config.hstate); |
881 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
882 | sb->s_magic = HUGETLBFS_MAGIC; |
883 | sb->s_op = &hugetlbfs_ops; | |
884 | sb->s_time_gran = 1; | |
885 | inode = hugetlbfs_get_inode(sb, config.uid, config.gid, | |
886 | S_IFDIR | config.mode, 0); | |
887 | if (!inode) | |
888 | goto out_free; | |
889 | ||
890 | root = d_alloc_root(inode); | |
891 | if (!root) { | |
892 | iput(inode); | |
893 | goto out_free; | |
894 | } | |
895 | sb->s_root = root; | |
896 | return 0; | |
897 | out_free: | |
898 | kfree(sbinfo); | |
899 | return -ENOMEM; | |
900 | } | |
901 | ||
9a119c05 | 902 | int hugetlb_get_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
903 | { |
904 | int ret = 0; | |
905 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
906 | ||
907 | if (sbinfo->free_blocks > -1) { | |
908 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 AL |
909 | if (sbinfo->free_blocks - delta >= 0) |
910 | sbinfo->free_blocks -= delta; | |
1da177e4 LT |
911 | else |
912 | ret = -ENOMEM; | |
913 | spin_unlock(&sbinfo->stat_lock); | |
914 | } | |
915 | ||
916 | return ret; | |
917 | } | |
918 | ||
9a119c05 | 919 | void hugetlb_put_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
920 | { |
921 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
922 | ||
923 | if (sbinfo->free_blocks > -1) { | |
924 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 | 925 | sbinfo->free_blocks += delta; |
1da177e4 LT |
926 | spin_unlock(&sbinfo->stat_lock); |
927 | } | |
928 | } | |
929 | ||
454e2398 DH |
930 | static int hugetlbfs_get_sb(struct file_system_type *fs_type, |
931 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 932 | { |
454e2398 | 933 | return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); |
1da177e4 LT |
934 | } |
935 | ||
936 | static struct file_system_type hugetlbfs_fs_type = { | |
937 | .name = "hugetlbfs", | |
938 | .get_sb = hugetlbfs_get_sb, | |
939 | .kill_sb = kill_litter_super, | |
940 | }; | |
941 | ||
942 | static struct vfsmount *hugetlbfs_vfsmount; | |
943 | ||
1da177e4 LT |
944 | static int can_do_hugetlb_shm(void) |
945 | { | |
8a0bdec1 | 946 | return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); |
1da177e4 LT |
947 | } |
948 | ||
5a6fe125 | 949 | struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag) |
1da177e4 LT |
950 | { |
951 | int error = -ENOMEM; | |
2584e517 | 952 | int unlock_shm = 0; |
1da177e4 LT |
953 | struct file *file; |
954 | struct inode *inode; | |
955 | struct dentry *dentry, *root; | |
956 | struct qstr quick_string; | |
86a264ab | 957 | struct user_struct *user = current_user(); |
1da177e4 | 958 | |
5bc98594 AM |
959 | if (!hugetlbfs_vfsmount) |
960 | return ERR_PTR(-ENOENT); | |
961 | ||
2584e517 RT |
962 | if (!can_do_hugetlb_shm()) { |
963 | if (user_shm_lock(size, user)) { | |
964 | unlock_shm = 1; | |
965 | WARN_ONCE(1, | |
966 | "Using mlock ulimits for SHM_HUGETLB deprecated\n"); | |
967 | } else | |
968 | return ERR_PTR(-EPERM); | |
969 | } | |
1da177e4 | 970 | |
1da177e4 | 971 | root = hugetlbfs_vfsmount->mnt_root; |
9d66586f | 972 | quick_string.name = name; |
1da177e4 LT |
973 | quick_string.len = strlen(quick_string.name); |
974 | quick_string.hash = 0; | |
975 | dentry = d_alloc(root, &quick_string); | |
976 | if (!dentry) | |
977 | goto out_shm_unlock; | |
978 | ||
1da177e4 | 979 | error = -ENOSPC; |
77c70de1 DH |
980 | inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(), |
981 | current_fsgid(), S_IFREG | S_IRWXUGO, 0); | |
1da177e4 | 982 | if (!inode) |
ce8d2cdf | 983 | goto out_dentry; |
1da177e4 | 984 | |
b45b5bd6 | 985 | error = -ENOMEM; |
a5516438 | 986 | if (hugetlb_reserve_pages(inode, 0, |
5a6fe125 MG |
987 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
988 | acctflag)) | |
b45b5bd6 DG |
989 | goto out_inode; |
990 | ||
1da177e4 LT |
991 | d_instantiate(dentry, inode); |
992 | inode->i_size = size; | |
993 | inode->i_nlink = 0; | |
ce8d2cdf DH |
994 | |
995 | error = -ENFILE; | |
996 | file = alloc_file(hugetlbfs_vfsmount, dentry, | |
997 | FMODE_WRITE | FMODE_READ, | |
998 | &hugetlbfs_file_operations); | |
999 | if (!file) | |
b4d232e6 | 1000 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 1001 | |
1da177e4 LT |
1002 | return file; |
1003 | ||
b45b5bd6 DG |
1004 | out_inode: |
1005 | iput(inode); | |
1da177e4 LT |
1006 | out_dentry: |
1007 | dput(dentry); | |
1008 | out_shm_unlock: | |
2584e517 RT |
1009 | if (unlock_shm) |
1010 | user_shm_unlock(size, user); | |
1da177e4 LT |
1011 | return ERR_PTR(error); |
1012 | } | |
1013 | ||
1014 | static int __init init_hugetlbfs_fs(void) | |
1015 | { | |
1016 | int error; | |
1017 | struct vfsmount *vfsmount; | |
1018 | ||
e0bf68dd PZ |
1019 | error = bdi_init(&hugetlbfs_backing_dev_info); |
1020 | if (error) | |
1021 | return error; | |
1022 | ||
1da177e4 LT |
1023 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1024 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 1025 | 0, 0, init_once); |
1da177e4 | 1026 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1027 | goto out2; |
1da177e4 LT |
1028 | |
1029 | error = register_filesystem(&hugetlbfs_fs_type); | |
1030 | if (error) | |
1031 | goto out; | |
1032 | ||
1033 | vfsmount = kern_mount(&hugetlbfs_fs_type); | |
1034 | ||
1035 | if (!IS_ERR(vfsmount)) { | |
1036 | hugetlbfs_vfsmount = vfsmount; | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | error = PTR_ERR(vfsmount); | |
1041 | ||
1042 | out: | |
1043 | if (error) | |
1044 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
e0bf68dd PZ |
1045 | out2: |
1046 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1047 | return error; |
1048 | } | |
1049 | ||
1050 | static void __exit exit_hugetlbfs_fs(void) | |
1051 | { | |
1052 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
1053 | unregister_filesystem(&hugetlbfs_fs_type); | |
e0bf68dd | 1054 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | module_init(init_hugetlbfs_fs) | |
1058 | module_exit(exit_hugetlbfs_fs) | |
1059 | ||
1060 | MODULE_LICENSE("GPL"); |