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> | |
1fd7317d | 33 | #include <linux/magic.h> |
290408d4 | 34 | #include <linux/migrate.h> |
1da177e4 LT |
35 | |
36 | #include <asm/uaccess.h> | |
37 | ||
ee9b6d61 | 38 | static const struct super_operations hugetlbfs_ops; |
f5e54d6e | 39 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 40 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
41 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
42 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 | 43 | |
a1d776ee DG |
44 | struct hugetlbfs_config { |
45 | uid_t uid; | |
46 | gid_t gid; | |
47 | umode_t mode; | |
48 | long nr_blocks; | |
49 | long nr_inodes; | |
50 | struct hstate *hstate; | |
51 | }; | |
52 | ||
53 | struct hugetlbfs_inode_info { | |
54 | struct shared_policy policy; | |
55 | struct inode vfs_inode; | |
56 | }; | |
57 | ||
58 | static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) | |
59 | { | |
60 | return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); | |
61 | } | |
62 | ||
1da177e4 | 63 | static struct backing_dev_info hugetlbfs_backing_dev_info = { |
d993831f | 64 | .name = "hugetlbfs", |
1da177e4 | 65 | .ra_pages = 0, /* No readahead */ |
e4ad08fe | 66 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
1da177e4 LT |
67 | }; |
68 | ||
69 | int sysctl_hugetlb_shm_group; | |
70 | ||
e73a75fa RD |
71 | enum { |
72 | Opt_size, Opt_nr_inodes, | |
73 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 74 | Opt_pagesize, |
e73a75fa RD |
75 | Opt_err, |
76 | }; | |
77 | ||
a447c093 | 78 | static const match_table_t tokens = { |
e73a75fa RD |
79 | {Opt_size, "size=%s"}, |
80 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
81 | {Opt_mode, "mode=%o"}, | |
82 | {Opt_uid, "uid=%u"}, | |
83 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 84 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
85 | {Opt_err, NULL}, |
86 | }; | |
87 | ||
2e9b367c AL |
88 | static void huge_pagevec_release(struct pagevec *pvec) |
89 | { | |
90 | int i; | |
91 | ||
92 | for (i = 0; i < pagevec_count(pvec); ++i) | |
93 | put_page(pvec->pages[i]); | |
94 | ||
95 | pagevec_reinit(pvec); | |
96 | } | |
97 | ||
1da177e4 LT |
98 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
99 | { | |
b39424e2 | 100 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
101 | loff_t len, vma_len; |
102 | int ret; | |
a5516438 | 103 | struct hstate *h = hstate_file(file); |
1da177e4 | 104 | |
68589bc3 | 105 | /* |
dec4ad86 DG |
106 | * vma address alignment (but not the pgoff alignment) has |
107 | * already been checked by prepare_hugepage_range. If you add | |
108 | * any error returns here, do so after setting VM_HUGETLB, so | |
109 | * is_vm_hugetlb_page tests below unmap_region go the right | |
110 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
111 | * and ia64). | |
68589bc3 HD |
112 | */ |
113 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; | |
114 | vma->vm_ops = &hugetlb_vm_ops; | |
1da177e4 | 115 | |
2b37c35e | 116 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
117 | return -EINVAL; |
118 | ||
1da177e4 LT |
119 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
120 | ||
1b1dcc1b | 121 | mutex_lock(&inode->i_mutex); |
1da177e4 | 122 | file_accessed(file); |
1da177e4 LT |
123 | |
124 | ret = -ENOMEM; | |
125 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 126 | |
a1e78772 | 127 | if (hugetlb_reserve_pages(inode, |
a5516438 | 128 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
129 | len >> huge_page_shift(h), vma, |
130 | vma->vm_flags)) | |
a43a8c39 | 131 | goto out; |
b45b5bd6 | 132 | |
4c887265 AL |
133 | ret = 0; |
134 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 135 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
136 | inode->i_size = len; |
137 | out: | |
1b1dcc1b | 138 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
139 | |
140 | return ret; | |
141 | } | |
142 | ||
143 | /* | |
508034a3 | 144 | * Called under down_write(mmap_sem). |
1da177e4 LT |
145 | */ |
146 | ||
d2ba27e8 | 147 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
148 | static unsigned long |
149 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
150 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
151 | { | |
152 | struct mm_struct *mm = current->mm; | |
153 | struct vm_area_struct *vma; | |
154 | unsigned long start_addr; | |
a5516438 | 155 | struct hstate *h = hstate_file(file); |
1da177e4 | 156 | |
a5516438 | 157 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
158 | return -EINVAL; |
159 | if (len > TASK_SIZE) | |
160 | return -ENOMEM; | |
161 | ||
036e0856 | 162 | if (flags & MAP_FIXED) { |
a5516438 | 163 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
164 | return -EINVAL; |
165 | return addr; | |
166 | } | |
167 | ||
1da177e4 | 168 | if (addr) { |
a5516438 | 169 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
170 | vma = find_vma(mm, addr); |
171 | if (TASK_SIZE - len >= addr && | |
172 | (!vma || addr + len <= vma->vm_start)) | |
173 | return addr; | |
174 | } | |
175 | ||
4bfc130d XG |
176 | if (len > mm->cached_hole_size) |
177 | start_addr = mm->free_area_cache; | |
178 | else { | |
1363c3cd | 179 | start_addr = TASK_UNMAPPED_BASE; |
4bfc130d XG |
180 | mm->cached_hole_size = 0; |
181 | } | |
1363c3cd | 182 | |
1da177e4 | 183 | full_search: |
a5516438 | 184 | addr = ALIGN(start_addr, huge_page_size(h)); |
1da177e4 LT |
185 | |
186 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |
187 | /* At this point: (!vma || addr < vma->vm_end). */ | |
188 | if (TASK_SIZE - len < addr) { | |
189 | /* | |
190 | * Start a new search - just in case we missed | |
191 | * some holes. | |
192 | */ | |
193 | if (start_addr != TASK_UNMAPPED_BASE) { | |
194 | start_addr = TASK_UNMAPPED_BASE; | |
4bfc130d | 195 | mm->cached_hole_size = 0; |
1da177e4 LT |
196 | goto full_search; |
197 | } | |
198 | return -ENOMEM; | |
199 | } | |
200 | ||
4bfc130d XG |
201 | if (!vma || addr + len <= vma->vm_start) { |
202 | mm->free_area_cache = addr + len; | |
1da177e4 | 203 | return addr; |
4bfc130d XG |
204 | } |
205 | if (addr + mm->cached_hole_size < vma->vm_start) | |
206 | mm->cached_hole_size = vma->vm_start - addr; | |
a5516438 | 207 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
1da177e4 LT |
208 | } |
209 | } | |
210 | #endif | |
211 | ||
e63e1e5a BP |
212 | static int |
213 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
214 | char __user *buf, unsigned long count, | |
215 | unsigned long size) | |
216 | { | |
217 | char *kaddr; | |
218 | unsigned long left, copied = 0; | |
219 | int i, chunksize; | |
220 | ||
221 | if (size > count) | |
222 | size = count; | |
223 | ||
224 | /* Find which 4k chunk and offset with in that chunk */ | |
225 | i = offset >> PAGE_CACHE_SHIFT; | |
226 | offset = offset & ~PAGE_CACHE_MASK; | |
227 | ||
228 | while (size) { | |
229 | chunksize = PAGE_CACHE_SIZE; | |
230 | if (offset) | |
231 | chunksize -= offset; | |
232 | if (chunksize > size) | |
233 | chunksize = size; | |
234 | kaddr = kmap(&page[i]); | |
235 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
236 | kunmap(&page[i]); | |
237 | if (left) { | |
238 | copied += (chunksize - left); | |
239 | break; | |
240 | } | |
241 | offset = 0; | |
242 | size -= chunksize; | |
243 | buf += chunksize; | |
244 | copied += chunksize; | |
245 | i++; | |
246 | } | |
247 | return copied ? copied : -EFAULT; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Support for read() - Find the page attached to f_mapping and copy out the | |
252 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
253 | * since it has PAGE_CACHE_SIZE assumptions. | |
254 | */ | |
255 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
256 | size_t len, loff_t *ppos) | |
257 | { | |
a5516438 | 258 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
259 | struct address_space *mapping = filp->f_mapping; |
260 | struct inode *inode = mapping->host; | |
a5516438 AK |
261 | unsigned long index = *ppos >> huge_page_shift(h); |
262 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
263 | unsigned long end_index; |
264 | loff_t isize; | |
265 | ssize_t retval = 0; | |
266 | ||
e63e1e5a BP |
267 | /* validate length */ |
268 | if (len == 0) | |
269 | goto out; | |
270 | ||
e63e1e5a BP |
271 | for (;;) { |
272 | struct page *page; | |
a5516438 | 273 | unsigned long nr, ret; |
91bf189c | 274 | int ra; |
e63e1e5a BP |
275 | |
276 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 277 | nr = huge_page_size(h); |
a05b0855 AK |
278 | isize = i_size_read(inode); |
279 | if (!isize) | |
280 | goto out; | |
281 | end_index = (isize - 1) >> huge_page_shift(h); | |
e63e1e5a BP |
282 | if (index >= end_index) { |
283 | if (index > end_index) | |
284 | goto out; | |
a5516438 | 285 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 286 | if (nr <= offset) |
e63e1e5a | 287 | goto out; |
e63e1e5a BP |
288 | } |
289 | nr = nr - offset; | |
290 | ||
291 | /* Find the page */ | |
a05b0855 | 292 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
293 | if (unlikely(page == NULL)) { |
294 | /* | |
295 | * We have a HOLE, zero out the user-buffer for the | |
296 | * length of the hole or request. | |
297 | */ | |
298 | ret = len < nr ? len : nr; | |
299 | if (clear_user(buf, ret)) | |
91bf189c RK |
300 | ra = -EFAULT; |
301 | else | |
302 | ra = 0; | |
e63e1e5a | 303 | } else { |
a05b0855 AK |
304 | unlock_page(page); |
305 | ||
e63e1e5a BP |
306 | /* |
307 | * We have the page, copy it to user space buffer. | |
308 | */ | |
91bf189c RK |
309 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
310 | ret = ra; | |
a05b0855 | 311 | page_cache_release(page); |
e63e1e5a | 312 | } |
91bf189c | 313 | if (ra < 0) { |
e63e1e5a | 314 | if (retval == 0) |
91bf189c | 315 | retval = ra; |
e63e1e5a BP |
316 | goto out; |
317 | } | |
318 | ||
319 | offset += ret; | |
320 | retval += ret; | |
321 | len -= ret; | |
a5516438 AK |
322 | index += offset >> huge_page_shift(h); |
323 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 324 | |
e63e1e5a BP |
325 | /* short read or no more work */ |
326 | if ((ret != nr) || (len == 0)) | |
327 | break; | |
328 | } | |
329 | out: | |
a5516438 | 330 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
331 | return retval; |
332 | } | |
333 | ||
800d15a5 NP |
334 | static int hugetlbfs_write_begin(struct file *file, |
335 | struct address_space *mapping, | |
336 | loff_t pos, unsigned len, unsigned flags, | |
337 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
338 | { |
339 | return -EINVAL; | |
340 | } | |
341 | ||
800d15a5 NP |
342 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
343 | loff_t pos, unsigned len, unsigned copied, | |
344 | struct page *page, void *fsdata) | |
1da177e4 | 345 | { |
800d15a5 | 346 | BUG(); |
1da177e4 LT |
347 | return -EINVAL; |
348 | } | |
349 | ||
1da177e4 LT |
350 | static void truncate_huge_page(struct page *page) |
351 | { | |
fba2591b | 352 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 | 353 | ClearPageUptodate(page); |
bd65cb86 | 354 | delete_from_page_cache(page); |
1da177e4 LT |
355 | } |
356 | ||
b45b5bd6 | 357 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 358 | { |
a5516438 | 359 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 360 | struct address_space *mapping = &inode->i_data; |
a5516438 | 361 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
362 | struct pagevec pvec; |
363 | pgoff_t next; | |
a43a8c39 | 364 | int i, freed = 0; |
1da177e4 LT |
365 | |
366 | pagevec_init(&pvec, 0); | |
367 | next = start; | |
368 | while (1) { | |
369 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
370 | if (next == start) | |
371 | break; | |
372 | next = start; | |
373 | continue; | |
374 | } | |
375 | ||
376 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
377 | struct page *page = pvec.pages[i]; | |
378 | ||
379 | lock_page(page); | |
380 | if (page->index > next) | |
381 | next = page->index; | |
382 | ++next; | |
383 | truncate_huge_page(page); | |
384 | unlock_page(page); | |
a43a8c39 | 385 | freed++; |
1da177e4 LT |
386 | } |
387 | huge_pagevec_release(&pvec); | |
388 | } | |
389 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 390 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
391 | } |
392 | ||
2bbbda30 | 393 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 394 | { |
b45b5bd6 | 395 | truncate_hugepages(inode, 0); |
dbd5768f | 396 | clear_inode(inode); |
149f4211 CH |
397 | } |
398 | ||
1da177e4 | 399 | static inline void |
856fc295 | 400 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
1da177e4 LT |
401 | { |
402 | struct vm_area_struct *vma; | |
403 | struct prio_tree_iter iter; | |
404 | ||
856fc295 | 405 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
406 | unsigned long v_offset; |
407 | ||
1da177e4 | 408 | /* |
856fc295 HD |
409 | * Can the expression below overflow on 32-bit arches? |
410 | * No, because the prio_tree returns us only those vmas | |
411 | * which overlap the truncated area starting at pgoff, | |
412 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 413 | */ |
856fc295 HD |
414 | if (vma->vm_pgoff < pgoff) |
415 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
416 | else | |
1da177e4 LT |
417 | v_offset = 0; |
418 | ||
24669e58 AK |
419 | unmap_hugepage_range(vma, vma->vm_start + v_offset, |
420 | vma->vm_end, NULL); | |
1da177e4 LT |
421 | } |
422 | } | |
423 | ||
1da177e4 LT |
424 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
425 | { | |
856fc295 | 426 | pgoff_t pgoff; |
1da177e4 | 427 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 428 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 429 | |
a5516438 | 430 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 431 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 432 | |
7aa91e10 | 433 | i_size_write(inode, offset); |
3d48ae45 | 434 | mutex_lock(&mapping->i_mmap_mutex); |
1da177e4 LT |
435 | if (!prio_tree_empty(&mapping->i_mmap)) |
436 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); | |
3d48ae45 | 437 | mutex_unlock(&mapping->i_mmap_mutex); |
b45b5bd6 | 438 | truncate_hugepages(inode, offset); |
1da177e4 LT |
439 | return 0; |
440 | } | |
441 | ||
442 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
443 | { | |
444 | struct inode *inode = dentry->d_inode; | |
a5516438 | 445 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
446 | int error; |
447 | unsigned int ia_valid = attr->ia_valid; | |
448 | ||
449 | BUG_ON(!inode); | |
450 | ||
451 | error = inode_change_ok(inode, attr); | |
452 | if (error) | |
1025774c | 453 | return error; |
1da177e4 LT |
454 | |
455 | if (ia_valid & ATTR_SIZE) { | |
456 | error = -EINVAL; | |
1025774c CH |
457 | if (attr->ia_size & ~huge_page_mask(h)) |
458 | return -EINVAL; | |
459 | error = hugetlb_vmtruncate(inode, attr->ia_size); | |
1da177e4 | 460 | if (error) |
1025774c | 461 | return error; |
1da177e4 | 462 | } |
1025774c CH |
463 | |
464 | setattr_copy(inode, attr); | |
465 | mark_inode_dirty(inode); | |
466 | return 0; | |
1da177e4 LT |
467 | } |
468 | ||
7d54fa64 AV |
469 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
470 | struct hugetlbfs_config *config) | |
1da177e4 LT |
471 | { |
472 | struct inode *inode; | |
1da177e4 LT |
473 | |
474 | inode = new_inode(sb); | |
475 | if (inode) { | |
476 | struct hugetlbfs_inode_info *info; | |
85fe4025 | 477 | inode->i_ino = get_next_ino(); |
7d54fa64 AV |
478 | inode->i_mode = S_IFDIR | config->mode; |
479 | inode->i_uid = config->uid; | |
480 | inode->i_gid = config->gid; | |
481 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
482 | info = HUGETLBFS_I(inode); | |
483 | mpol_shared_policy_init(&info->policy, NULL); | |
484 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
485 | inode->i_fop = &simple_dir_operations; | |
486 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
487 | inc_nlink(inode); | |
65ed7601 | 488 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
489 | } |
490 | return inode; | |
491 | } | |
492 | ||
493 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, | |
494 | struct inode *dir, | |
18df2252 | 495 | umode_t mode, dev_t dev) |
7d54fa64 AV |
496 | { |
497 | struct inode *inode; | |
498 | ||
499 | inode = new_inode(sb); | |
500 | if (inode) { | |
501 | struct hugetlbfs_inode_info *info; | |
502 | inode->i_ino = get_next_ino(); | |
503 | inode_init_owner(inode, dir, mode); | |
1da177e4 LT |
504 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
505 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
506 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a43a8c39 | 507 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
1da177e4 | 508 | info = HUGETLBFS_I(inode); |
6bfde05b EM |
509 | /* |
510 | * The policy is initialized here even if we are creating a | |
511 | * private inode because initialization simply creates an | |
512 | * an empty rb tree and calls spin_lock_init(), later when we | |
513 | * call mpol_free_shared_policy() it will just return because | |
514 | * the rb tree will still be empty. | |
515 | */ | |
71fe804b | 516 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
517 | switch (mode & S_IFMT) { |
518 | default: | |
519 | init_special_inode(inode, mode, dev); | |
520 | break; | |
521 | case S_IFREG: | |
522 | inode->i_op = &hugetlbfs_inode_operations; | |
523 | inode->i_fop = &hugetlbfs_file_operations; | |
524 | break; | |
525 | case S_IFDIR: | |
526 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
527 | inode->i_fop = &simple_dir_operations; | |
528 | ||
529 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 530 | inc_nlink(inode); |
1da177e4 LT |
531 | break; |
532 | case S_IFLNK: | |
533 | inode->i_op = &page_symlink_inode_operations; | |
534 | break; | |
535 | } | |
e096d0c7 | 536 | lockdep_annotate_inode_mutex_key(inode); |
1da177e4 LT |
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, | |
1a67aafb | 545 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
546 | { |
547 | struct inode *inode; | |
548 | int error = -ENOSPC; | |
7d54fa64 AV |
549 | |
550 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
1da177e4 LT |
551 | if (inode) { |
552 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
553 | d_instantiate(dentry, inode); | |
554 | dget(dentry); /* Extra count - pin the dentry in core */ | |
555 | error = 0; | |
556 | } | |
557 | return error; | |
558 | } | |
559 | ||
18bb1db3 | 560 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
561 | { |
562 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
563 | if (!retval) | |
d8c76e6f | 564 | inc_nlink(dir); |
1da177e4 LT |
565 | return retval; |
566 | } | |
567 | ||
ebfc3b49 | 568 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
569 | { |
570 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
571 | } | |
572 | ||
573 | static int hugetlbfs_symlink(struct inode *dir, | |
574 | struct dentry *dentry, const char *symname) | |
575 | { | |
576 | struct inode *inode; | |
577 | int error = -ENOSPC; | |
1da177e4 | 578 | |
7d54fa64 | 579 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
580 | if (inode) { |
581 | int l = strlen(symname)+1; | |
582 | error = page_symlink(inode, symname, l); | |
583 | if (!error) { | |
584 | d_instantiate(dentry, inode); | |
585 | dget(dentry); | |
586 | } else | |
587 | iput(inode); | |
588 | } | |
589 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
590 | ||
591 | return error; | |
592 | } | |
593 | ||
594 | /* | |
6649a386 | 595 | * mark the head page dirty |
1da177e4 LT |
596 | */ |
597 | static int hugetlbfs_set_page_dirty(struct page *page) | |
598 | { | |
d85f3385 | 599 | struct page *head = compound_head(page); |
6649a386 KC |
600 | |
601 | SetPageDirty(head); | |
1da177e4 LT |
602 | return 0; |
603 | } | |
604 | ||
290408d4 | 605 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
b969c4ab | 606 | struct page *newpage, struct page *page, |
a6bc32b8 | 607 | enum migrate_mode mode) |
290408d4 NH |
608 | { |
609 | int rc; | |
610 | ||
611 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); | |
612 | if (rc) | |
613 | return rc; | |
614 | migrate_page_copy(newpage, page); | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
726c3342 | 619 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 620 | { |
726c3342 | 621 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 622 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
623 | |
624 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 625 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
626 | if (sbinfo) { |
627 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
628 | /* If no limits set, just report 0 for max/free/used |
629 | * blocks, like simple_statfs() */ | |
90481622 DG |
630 | if (sbinfo->spool) { |
631 | long free_pages; | |
632 | ||
633 | spin_lock(&sbinfo->spool->lock); | |
634 | buf->f_blocks = sbinfo->spool->max_hpages; | |
635 | free_pages = sbinfo->spool->max_hpages | |
636 | - sbinfo->spool->used_hpages; | |
637 | buf->f_bavail = buf->f_bfree = free_pages; | |
638 | spin_unlock(&sbinfo->spool->lock); | |
74a8a65c DG |
639 | buf->f_files = sbinfo->max_inodes; |
640 | buf->f_ffree = sbinfo->free_inodes; | |
641 | } | |
1da177e4 LT |
642 | spin_unlock(&sbinfo->stat_lock); |
643 | } | |
644 | buf->f_namelen = NAME_MAX; | |
645 | return 0; | |
646 | } | |
647 | ||
648 | static void hugetlbfs_put_super(struct super_block *sb) | |
649 | { | |
650 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
651 | ||
652 | if (sbi) { | |
653 | sb->s_fs_info = NULL; | |
90481622 DG |
654 | |
655 | if (sbi->spool) | |
656 | hugepage_put_subpool(sbi->spool); | |
657 | ||
1da177e4 LT |
658 | kfree(sbi); |
659 | } | |
660 | } | |
661 | ||
96527980 CH |
662 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
663 | { | |
664 | if (sbinfo->free_inodes >= 0) { | |
665 | spin_lock(&sbinfo->stat_lock); | |
666 | if (unlikely(!sbinfo->free_inodes)) { | |
667 | spin_unlock(&sbinfo->stat_lock); | |
668 | return 0; | |
669 | } | |
670 | sbinfo->free_inodes--; | |
671 | spin_unlock(&sbinfo->stat_lock); | |
672 | } | |
673 | ||
674 | return 1; | |
675 | } | |
676 | ||
677 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
678 | { | |
679 | if (sbinfo->free_inodes >= 0) { | |
680 | spin_lock(&sbinfo->stat_lock); | |
681 | sbinfo->free_inodes++; | |
682 | spin_unlock(&sbinfo->stat_lock); | |
683 | } | |
684 | } | |
685 | ||
686 | ||
e18b890b | 687 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
688 | |
689 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
690 | { | |
96527980 | 691 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
692 | struct hugetlbfs_inode_info *p; |
693 | ||
96527980 CH |
694 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
695 | return NULL; | |
e94b1766 | 696 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
697 | if (unlikely(!p)) { |
698 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 699 | return NULL; |
96527980 | 700 | } |
1da177e4 LT |
701 | return &p->vfs_inode; |
702 | } | |
703 | ||
fa0d7e3d NP |
704 | static void hugetlbfs_i_callback(struct rcu_head *head) |
705 | { | |
706 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
707 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
708 | } | |
709 | ||
1da177e4 LT |
710 | static void hugetlbfs_destroy_inode(struct inode *inode) |
711 | { | |
96527980 | 712 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 713 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
fa0d7e3d | 714 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
1da177e4 LT |
715 | } |
716 | ||
f5e54d6e | 717 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
718 | .write_begin = hugetlbfs_write_begin, |
719 | .write_end = hugetlbfs_write_end, | |
1da177e4 | 720 | .set_page_dirty = hugetlbfs_set_page_dirty, |
290408d4 | 721 | .migratepage = hugetlbfs_migrate_page, |
1da177e4 LT |
722 | }; |
723 | ||
96527980 | 724 | |
51cc5068 | 725 | static void init_once(void *foo) |
96527980 CH |
726 | { |
727 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
728 | ||
a35afb83 | 729 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
730 | } |
731 | ||
4b6f5d20 | 732 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 733 | .read = hugetlbfs_read, |
1da177e4 | 734 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 735 | .fsync = noop_fsync, |
1da177e4 | 736 | .get_unmapped_area = hugetlb_get_unmapped_area, |
6038f373 | 737 | .llseek = default_llseek, |
1da177e4 LT |
738 | }; |
739 | ||
92e1d5be | 740 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
741 | .create = hugetlbfs_create, |
742 | .lookup = simple_lookup, | |
743 | .link = simple_link, | |
744 | .unlink = simple_unlink, | |
745 | .symlink = hugetlbfs_symlink, | |
746 | .mkdir = hugetlbfs_mkdir, | |
747 | .rmdir = simple_rmdir, | |
748 | .mknod = hugetlbfs_mknod, | |
749 | .rename = simple_rename, | |
750 | .setattr = hugetlbfs_setattr, | |
751 | }; | |
752 | ||
92e1d5be | 753 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
754 | .setattr = hugetlbfs_setattr, |
755 | }; | |
756 | ||
ee9b6d61 | 757 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
758 | .alloc_inode = hugetlbfs_alloc_inode, |
759 | .destroy_inode = hugetlbfs_destroy_inode, | |
2bbbda30 | 760 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 761 | .statfs = hugetlbfs_statfs, |
1da177e4 | 762 | .put_super = hugetlbfs_put_super, |
10f19a86 | 763 | .show_options = generic_show_options, |
1da177e4 LT |
764 | }; |
765 | ||
766 | static int | |
767 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
768 | { | |
e73a75fa RD |
769 | char *p, *rest; |
770 | substring_t args[MAX_OPT_ARGS]; | |
771 | int option; | |
a137e1cc AK |
772 | unsigned long long size = 0; |
773 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
774 | |
775 | if (!options) | |
776 | return 0; | |
1da177e4 | 777 | |
e73a75fa RD |
778 | while ((p = strsep(&options, ",")) != NULL) { |
779 | int token; | |
b4c07bce LS |
780 | if (!*p) |
781 | continue; | |
e73a75fa RD |
782 | |
783 | token = match_token(p, tokens, args); | |
784 | switch (token) { | |
785 | case Opt_uid: | |
786 | if (match_int(&args[0], &option)) | |
787 | goto bad_val; | |
788 | pconfig->uid = option; | |
789 | break; | |
790 | ||
791 | case Opt_gid: | |
792 | if (match_int(&args[0], &option)) | |
793 | goto bad_val; | |
794 | pconfig->gid = option; | |
795 | break; | |
796 | ||
797 | case Opt_mode: | |
798 | if (match_octal(&args[0], &option)) | |
799 | goto bad_val; | |
75897d60 | 800 | pconfig->mode = option & 01777U; |
e73a75fa RD |
801 | break; |
802 | ||
803 | case Opt_size: { | |
e73a75fa RD |
804 | /* memparse() will accept a K/M/G without a digit */ |
805 | if (!isdigit(*args[0].from)) | |
806 | goto bad_val; | |
807 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
808 | setsize = SIZE_STD; |
809 | if (*rest == '%') | |
810 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
811 | break; |
812 | } | |
1da177e4 | 813 | |
e73a75fa RD |
814 | case Opt_nr_inodes: |
815 | /* memparse() will accept a K/M/G without a digit */ | |
816 | if (!isdigit(*args[0].from)) | |
817 | goto bad_val; | |
818 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
819 | break; | |
820 | ||
a137e1cc AK |
821 | case Opt_pagesize: { |
822 | unsigned long ps; | |
823 | ps = memparse(args[0].from, &rest); | |
824 | pconfig->hstate = size_to_hstate(ps); | |
825 | if (!pconfig->hstate) { | |
826 | printk(KERN_ERR | |
827 | "hugetlbfs: Unsupported page size %lu MB\n", | |
828 | ps >> 20); | |
829 | return -EINVAL; | |
830 | } | |
831 | break; | |
832 | } | |
833 | ||
e73a75fa | 834 | default: |
b4c07bce LS |
835 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
836 | p); | |
837 | return -EINVAL; | |
e73a75fa RD |
838 | break; |
839 | } | |
1da177e4 | 840 | } |
a137e1cc AK |
841 | |
842 | /* Do size after hstate is set up */ | |
843 | if (setsize > NO_SIZE) { | |
844 | struct hstate *h = pconfig->hstate; | |
845 | if (setsize == SIZE_PERCENT) { | |
846 | size <<= huge_page_shift(h); | |
847 | size *= h->max_huge_pages; | |
848 | do_div(size, 100); | |
849 | } | |
850 | pconfig->nr_blocks = (size >> huge_page_shift(h)); | |
851 | } | |
852 | ||
1da177e4 | 853 | return 0; |
e73a75fa RD |
854 | |
855 | bad_val: | |
856 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", | |
857 | args[0].from, p); | |
c12ddba0 | 858 | return -EINVAL; |
1da177e4 LT |
859 | } |
860 | ||
861 | static int | |
862 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
863 | { | |
1da177e4 LT |
864 | int ret; |
865 | struct hugetlbfs_config config; | |
866 | struct hugetlbfs_sb_info *sbinfo; | |
867 | ||
10f19a86 MS |
868 | save_mount_options(sb, data); |
869 | ||
1da177e4 LT |
870 | config.nr_blocks = -1; /* No limit on size by default */ |
871 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
872 | config.uid = current_fsuid(); |
873 | config.gid = current_fsgid(); | |
1da177e4 | 874 | config.mode = 0755; |
a137e1cc | 875 | config.hstate = &default_hstate; |
1da177e4 | 876 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
877 | if (ret) |
878 | return ret; | |
879 | ||
880 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
881 | if (!sbinfo) | |
882 | return -ENOMEM; | |
883 | sb->s_fs_info = sbinfo; | |
a137e1cc | 884 | sbinfo->hstate = config.hstate; |
1da177e4 | 885 | spin_lock_init(&sbinfo->stat_lock); |
1da177e4 LT |
886 | sbinfo->max_inodes = config.nr_inodes; |
887 | sbinfo->free_inodes = config.nr_inodes; | |
90481622 DG |
888 | sbinfo->spool = NULL; |
889 | if (config.nr_blocks != -1) { | |
890 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); | |
891 | if (!sbinfo->spool) | |
892 | goto out_free; | |
893 | } | |
1da177e4 | 894 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
a137e1cc AK |
895 | sb->s_blocksize = huge_page_size(config.hstate); |
896 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
897 | sb->s_magic = HUGETLBFS_MAGIC; |
898 | sb->s_op = &hugetlbfs_ops; | |
899 | sb->s_time_gran = 1; | |
48fde701 AV |
900 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
901 | if (!sb->s_root) | |
1da177e4 | 902 | goto out_free; |
1da177e4 LT |
903 | return 0; |
904 | out_free: | |
90481622 DG |
905 | if (sbinfo->spool) |
906 | kfree(sbinfo->spool); | |
1da177e4 LT |
907 | kfree(sbinfo); |
908 | return -ENOMEM; | |
909 | } | |
910 | ||
3c26ff6e AV |
911 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
912 | int flags, const char *dev_name, void *data) | |
1da177e4 | 913 | { |
3c26ff6e | 914 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
1da177e4 LT |
915 | } |
916 | ||
917 | static struct file_system_type hugetlbfs_fs_type = { | |
918 | .name = "hugetlbfs", | |
3c26ff6e | 919 | .mount = hugetlbfs_mount, |
1da177e4 LT |
920 | .kill_sb = kill_litter_super, |
921 | }; | |
922 | ||
923 | static struct vfsmount *hugetlbfs_vfsmount; | |
924 | ||
ef1ff6b8 | 925 | static int can_do_hugetlb_shm(void) |
1da177e4 | 926 | { |
ef1ff6b8 | 927 | return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); |
1da177e4 LT |
928 | } |
929 | ||
40716e29 ST |
930 | struct file *hugetlb_file_setup(const char *name, unsigned long addr, |
931 | size_t size, vm_flags_t acctflag, | |
6bfde05b | 932 | struct user_struct **user, int creat_flags) |
1da177e4 LT |
933 | { |
934 | int error = -ENOMEM; | |
935 | struct file *file; | |
936 | struct inode *inode; | |
2c48b9c4 AV |
937 | struct path path; |
938 | struct dentry *root; | |
1da177e4 | 939 | struct qstr quick_string; |
40716e29 ST |
940 | struct hstate *hstate; |
941 | unsigned long num_pages; | |
1da177e4 | 942 | |
353d5c30 | 943 | *user = NULL; |
5bc98594 AM |
944 | if (!hugetlbfs_vfsmount) |
945 | return ERR_PTR(-ENOENT); | |
946 | ||
ef1ff6b8 | 947 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
353d5c30 HD |
948 | *user = current_user(); |
949 | if (user_shm_lock(size, *user)) { | |
21a3c273 DR |
950 | task_lock(current); |
951 | printk_once(KERN_WARNING | |
952 | "%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", | |
953 | current->comm, current->pid); | |
954 | task_unlock(current); | |
353d5c30 HD |
955 | } else { |
956 | *user = NULL; | |
2584e517 | 957 | return ERR_PTR(-EPERM); |
353d5c30 | 958 | } |
2584e517 | 959 | } |
1da177e4 | 960 | |
1da177e4 | 961 | root = hugetlbfs_vfsmount->mnt_root; |
9d66586f | 962 | quick_string.name = name; |
1da177e4 LT |
963 | quick_string.len = strlen(quick_string.name); |
964 | quick_string.hash = 0; | |
2c48b9c4 AV |
965 | path.dentry = d_alloc(root, &quick_string); |
966 | if (!path.dentry) | |
1da177e4 LT |
967 | goto out_shm_unlock; |
968 | ||
2c48b9c4 | 969 | path.mnt = mntget(hugetlbfs_vfsmount); |
1da177e4 | 970 | error = -ENOSPC; |
7d54fa64 | 971 | inode = hugetlbfs_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 972 | if (!inode) |
ce8d2cdf | 973 | goto out_dentry; |
1da177e4 | 974 | |
40716e29 ST |
975 | hstate = hstate_inode(inode); |
976 | size += addr & ~huge_page_mask(hstate); | |
977 | num_pages = ALIGN(size, huge_page_size(hstate)) >> | |
978 | huge_page_shift(hstate); | |
b45b5bd6 | 979 | error = -ENOMEM; |
40716e29 | 980 | if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag)) |
b45b5bd6 DG |
981 | goto out_inode; |
982 | ||
2c48b9c4 | 983 | d_instantiate(path.dentry, inode); |
1da177e4 | 984 | inode->i_size = size; |
6d6b77f1 | 985 | clear_nlink(inode); |
ce8d2cdf DH |
986 | |
987 | error = -ENFILE; | |
2c48b9c4 | 988 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
ce8d2cdf DH |
989 | &hugetlbfs_file_operations); |
990 | if (!file) | |
b4d232e6 | 991 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 992 | |
1da177e4 LT |
993 | return file; |
994 | ||
b45b5bd6 DG |
995 | out_inode: |
996 | iput(inode); | |
1da177e4 | 997 | out_dentry: |
2c48b9c4 | 998 | path_put(&path); |
1da177e4 | 999 | out_shm_unlock: |
353d5c30 HD |
1000 | if (*user) { |
1001 | user_shm_unlock(size, *user); | |
1002 | *user = NULL; | |
1003 | } | |
1da177e4 LT |
1004 | return ERR_PTR(error); |
1005 | } | |
1006 | ||
1007 | static int __init init_hugetlbfs_fs(void) | |
1008 | { | |
1009 | int error; | |
1010 | struct vfsmount *vfsmount; | |
1011 | ||
e0bf68dd PZ |
1012 | error = bdi_init(&hugetlbfs_backing_dev_info); |
1013 | if (error) | |
1014 | return error; | |
1015 | ||
d1d5e05f | 1016 | error = -ENOMEM; |
1da177e4 LT |
1017 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1018 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 1019 | 0, 0, init_once); |
1da177e4 | 1020 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1021 | goto out2; |
1da177e4 LT |
1022 | |
1023 | error = register_filesystem(&hugetlbfs_fs_type); | |
1024 | if (error) | |
1025 | goto out; | |
1026 | ||
1027 | vfsmount = kern_mount(&hugetlbfs_fs_type); | |
1028 | ||
1029 | if (!IS_ERR(vfsmount)) { | |
1030 | hugetlbfs_vfsmount = vfsmount; | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | error = PTR_ERR(vfsmount); | |
1035 | ||
1036 | out: | |
d1d5e05f | 1037 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
e0bf68dd PZ |
1038 | out2: |
1039 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1040 | return error; |
1041 | } | |
1042 | ||
1043 | static void __exit exit_hugetlbfs_fs(void) | |
1044 | { | |
8c0a8537 KS |
1045 | /* |
1046 | * Make sure all delayed rcu free inodes are flushed before we | |
1047 | * destroy cache. | |
1048 | */ | |
1049 | rcu_barrier(); | |
1da177e4 | 1050 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
423e0ab0 | 1051 | kern_unmount(hugetlbfs_vfsmount); |
1da177e4 | 1052 | unregister_filesystem(&hugetlbfs_fs_type); |
e0bf68dd | 1053 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | module_init(init_hugetlbfs_fs) | |
1057 | module_exit(exit_hugetlbfs_fs) | |
1058 | ||
1059 | MODULE_LICENSE("GPL"); |