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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * hugetlbpage-backed filesystem. Based on ramfs. | |
3 | * | |
6d49e352 | 4 | * Nadia Yvette Chambers, 2002 |
1da177e4 LT |
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 | 44 | struct hugetlbfs_config { |
a0eb3a05 EB |
45 | kuid_t uid; |
46 | kgid_t gid; | |
a1d776ee DG |
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 | { | |
496ad9aa | 100 | struct inode *inode = file_inode(file); |
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 | 112 | */ |
a2fce914 | 113 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
68589bc3 | 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; | |
a5516438 | 154 | struct hstate *h = hstate_file(file); |
08659355 | 155 | struct vm_unmapped_area_info info; |
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 | ||
08659355 ML |
176 | info.flags = 0; |
177 | info.length = len; | |
178 | info.low_limit = TASK_UNMAPPED_BASE; | |
179 | info.high_limit = TASK_SIZE; | |
180 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
181 | info.align_offset = 0; | |
182 | return vm_unmapped_area(&info); | |
1da177e4 LT |
183 | } |
184 | #endif | |
185 | ||
e63e1e5a BP |
186 | static int |
187 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
188 | char __user *buf, unsigned long count, | |
189 | unsigned long size) | |
190 | { | |
191 | char *kaddr; | |
192 | unsigned long left, copied = 0; | |
193 | int i, chunksize; | |
194 | ||
195 | if (size > count) | |
196 | size = count; | |
197 | ||
198 | /* Find which 4k chunk and offset with in that chunk */ | |
199 | i = offset >> PAGE_CACHE_SHIFT; | |
200 | offset = offset & ~PAGE_CACHE_MASK; | |
201 | ||
202 | while (size) { | |
203 | chunksize = PAGE_CACHE_SIZE; | |
204 | if (offset) | |
205 | chunksize -= offset; | |
206 | if (chunksize > size) | |
207 | chunksize = size; | |
208 | kaddr = kmap(&page[i]); | |
209 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
210 | kunmap(&page[i]); | |
211 | if (left) { | |
212 | copied += (chunksize - left); | |
213 | break; | |
214 | } | |
215 | offset = 0; | |
216 | size -= chunksize; | |
217 | buf += chunksize; | |
218 | copied += chunksize; | |
219 | i++; | |
220 | } | |
221 | return copied ? copied : -EFAULT; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Support for read() - Find the page attached to f_mapping and copy out the | |
226 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
227 | * since it has PAGE_CACHE_SIZE assumptions. | |
228 | */ | |
229 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
230 | size_t len, loff_t *ppos) | |
231 | { | |
a5516438 | 232 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
233 | struct address_space *mapping = filp->f_mapping; |
234 | struct inode *inode = mapping->host; | |
a5516438 AK |
235 | unsigned long index = *ppos >> huge_page_shift(h); |
236 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
237 | unsigned long end_index; |
238 | loff_t isize; | |
239 | ssize_t retval = 0; | |
240 | ||
e63e1e5a BP |
241 | /* validate length */ |
242 | if (len == 0) | |
243 | goto out; | |
244 | ||
e63e1e5a BP |
245 | for (;;) { |
246 | struct page *page; | |
a5516438 | 247 | unsigned long nr, ret; |
91bf189c | 248 | int ra; |
e63e1e5a BP |
249 | |
250 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 251 | nr = huge_page_size(h); |
a05b0855 AK |
252 | isize = i_size_read(inode); |
253 | if (!isize) | |
254 | goto out; | |
255 | end_index = (isize - 1) >> huge_page_shift(h); | |
e63e1e5a BP |
256 | if (index >= end_index) { |
257 | if (index > end_index) | |
258 | goto out; | |
a5516438 | 259 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 260 | if (nr <= offset) |
e63e1e5a | 261 | goto out; |
e63e1e5a BP |
262 | } |
263 | nr = nr - offset; | |
264 | ||
265 | /* Find the page */ | |
a05b0855 | 266 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
267 | if (unlikely(page == NULL)) { |
268 | /* | |
269 | * We have a HOLE, zero out the user-buffer for the | |
270 | * length of the hole or request. | |
271 | */ | |
272 | ret = len < nr ? len : nr; | |
273 | if (clear_user(buf, ret)) | |
91bf189c RK |
274 | ra = -EFAULT; |
275 | else | |
276 | ra = 0; | |
e63e1e5a | 277 | } else { |
a05b0855 AK |
278 | unlock_page(page); |
279 | ||
e63e1e5a BP |
280 | /* |
281 | * We have the page, copy it to user space buffer. | |
282 | */ | |
91bf189c RK |
283 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
284 | ret = ra; | |
a05b0855 | 285 | page_cache_release(page); |
e63e1e5a | 286 | } |
91bf189c | 287 | if (ra < 0) { |
e63e1e5a | 288 | if (retval == 0) |
91bf189c | 289 | retval = ra; |
e63e1e5a BP |
290 | goto out; |
291 | } | |
292 | ||
293 | offset += ret; | |
294 | retval += ret; | |
295 | len -= ret; | |
a5516438 AK |
296 | index += offset >> huge_page_shift(h); |
297 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 298 | |
e63e1e5a BP |
299 | /* short read or no more work */ |
300 | if ((ret != nr) || (len == 0)) | |
301 | break; | |
302 | } | |
303 | out: | |
a5516438 | 304 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
305 | return retval; |
306 | } | |
307 | ||
800d15a5 NP |
308 | static int hugetlbfs_write_begin(struct file *file, |
309 | struct address_space *mapping, | |
310 | loff_t pos, unsigned len, unsigned flags, | |
311 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
312 | { |
313 | return -EINVAL; | |
314 | } | |
315 | ||
800d15a5 NP |
316 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
317 | loff_t pos, unsigned len, unsigned copied, | |
318 | struct page *page, void *fsdata) | |
1da177e4 | 319 | { |
800d15a5 | 320 | BUG(); |
1da177e4 LT |
321 | return -EINVAL; |
322 | } | |
323 | ||
1da177e4 LT |
324 | static void truncate_huge_page(struct page *page) |
325 | { | |
fba2591b | 326 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 | 327 | ClearPageUptodate(page); |
bd65cb86 | 328 | delete_from_page_cache(page); |
1da177e4 LT |
329 | } |
330 | ||
b45b5bd6 | 331 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 332 | { |
a5516438 | 333 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 334 | struct address_space *mapping = &inode->i_data; |
a5516438 | 335 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
336 | struct pagevec pvec; |
337 | pgoff_t next; | |
a43a8c39 | 338 | int i, freed = 0; |
1da177e4 LT |
339 | |
340 | pagevec_init(&pvec, 0); | |
341 | next = start; | |
342 | while (1) { | |
343 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
344 | if (next == start) | |
345 | break; | |
346 | next = start; | |
347 | continue; | |
348 | } | |
349 | ||
350 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
351 | struct page *page = pvec.pages[i]; | |
352 | ||
353 | lock_page(page); | |
354 | if (page->index > next) | |
355 | next = page->index; | |
356 | ++next; | |
357 | truncate_huge_page(page); | |
358 | unlock_page(page); | |
a43a8c39 | 359 | freed++; |
1da177e4 LT |
360 | } |
361 | huge_pagevec_release(&pvec); | |
362 | } | |
363 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 364 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
365 | } |
366 | ||
2bbbda30 | 367 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 368 | { |
b45b5bd6 | 369 | truncate_hugepages(inode, 0); |
dbd5768f | 370 | clear_inode(inode); |
149f4211 CH |
371 | } |
372 | ||
1da177e4 | 373 | static inline void |
6b2dbba8 | 374 | hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) |
1da177e4 LT |
375 | { |
376 | struct vm_area_struct *vma; | |
1da177e4 | 377 | |
6b2dbba8 | 378 | vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
379 | unsigned long v_offset; |
380 | ||
1da177e4 | 381 | /* |
856fc295 | 382 | * Can the expression below overflow on 32-bit arches? |
6b2dbba8 | 383 | * No, because the interval tree returns us only those vmas |
856fc295 HD |
384 | * which overlap the truncated area starting at pgoff, |
385 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 386 | */ |
856fc295 HD |
387 | if (vma->vm_pgoff < pgoff) |
388 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
389 | else | |
1da177e4 LT |
390 | v_offset = 0; |
391 | ||
24669e58 AK |
392 | unmap_hugepage_range(vma, vma->vm_start + v_offset, |
393 | vma->vm_end, NULL); | |
1da177e4 LT |
394 | } |
395 | } | |
396 | ||
1da177e4 LT |
397 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
398 | { | |
856fc295 | 399 | pgoff_t pgoff; |
1da177e4 | 400 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 401 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 402 | |
a5516438 | 403 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 404 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 405 | |
7aa91e10 | 406 | i_size_write(inode, offset); |
3d48ae45 | 407 | mutex_lock(&mapping->i_mmap_mutex); |
6b2dbba8 | 408 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
1da177e4 | 409 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
3d48ae45 | 410 | mutex_unlock(&mapping->i_mmap_mutex); |
b45b5bd6 | 411 | truncate_hugepages(inode, offset); |
1da177e4 LT |
412 | return 0; |
413 | } | |
414 | ||
415 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
416 | { | |
417 | struct inode *inode = dentry->d_inode; | |
a5516438 | 418 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
419 | int error; |
420 | unsigned int ia_valid = attr->ia_valid; | |
421 | ||
422 | BUG_ON(!inode); | |
423 | ||
424 | error = inode_change_ok(inode, attr); | |
425 | if (error) | |
1025774c | 426 | return error; |
1da177e4 LT |
427 | |
428 | if (ia_valid & ATTR_SIZE) { | |
429 | error = -EINVAL; | |
1025774c CH |
430 | if (attr->ia_size & ~huge_page_mask(h)) |
431 | return -EINVAL; | |
432 | error = hugetlb_vmtruncate(inode, attr->ia_size); | |
1da177e4 | 433 | if (error) |
1025774c | 434 | return error; |
1da177e4 | 435 | } |
1025774c CH |
436 | |
437 | setattr_copy(inode, attr); | |
438 | mark_inode_dirty(inode); | |
439 | return 0; | |
1da177e4 LT |
440 | } |
441 | ||
7d54fa64 AV |
442 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
443 | struct hugetlbfs_config *config) | |
1da177e4 LT |
444 | { |
445 | struct inode *inode; | |
1da177e4 LT |
446 | |
447 | inode = new_inode(sb); | |
448 | if (inode) { | |
449 | struct hugetlbfs_inode_info *info; | |
85fe4025 | 450 | inode->i_ino = get_next_ino(); |
7d54fa64 AV |
451 | inode->i_mode = S_IFDIR | config->mode; |
452 | inode->i_uid = config->uid; | |
453 | inode->i_gid = config->gid; | |
454 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
455 | info = HUGETLBFS_I(inode); | |
456 | mpol_shared_policy_init(&info->policy, NULL); | |
457 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
458 | inode->i_fop = &simple_dir_operations; | |
459 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
460 | inc_nlink(inode); | |
65ed7601 | 461 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
462 | } |
463 | return inode; | |
464 | } | |
465 | ||
b610ded7 MH |
466 | /* |
467 | * Hugetlbfs is not reclaimable; therefore its i_mmap_mutex will never | |
468 | * be taken from reclaim -- unlike regular filesystems. This needs an | |
469 | * annotation because huge_pmd_share() does an allocation under | |
470 | * i_mmap_mutex. | |
471 | */ | |
472 | struct lock_class_key hugetlbfs_i_mmap_mutex_key; | |
473 | ||
7d54fa64 AV |
474 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
475 | struct inode *dir, | |
18df2252 | 476 | umode_t mode, dev_t dev) |
7d54fa64 AV |
477 | { |
478 | struct inode *inode; | |
479 | ||
480 | inode = new_inode(sb); | |
481 | if (inode) { | |
482 | struct hugetlbfs_inode_info *info; | |
483 | inode->i_ino = get_next_ino(); | |
484 | inode_init_owner(inode, dir, mode); | |
b610ded7 MH |
485 | lockdep_set_class(&inode->i_mapping->i_mmap_mutex, |
486 | &hugetlbfs_i_mmap_mutex_key); | |
1da177e4 LT |
487 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
488 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
489 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a43a8c39 | 490 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
1da177e4 | 491 | info = HUGETLBFS_I(inode); |
6bfde05b EM |
492 | /* |
493 | * The policy is initialized here even if we are creating a | |
494 | * private inode because initialization simply creates an | |
495 | * an empty rb tree and calls spin_lock_init(), later when we | |
496 | * call mpol_free_shared_policy() it will just return because | |
497 | * the rb tree will still be empty. | |
498 | */ | |
71fe804b | 499 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
500 | switch (mode & S_IFMT) { |
501 | default: | |
502 | init_special_inode(inode, mode, dev); | |
503 | break; | |
504 | case S_IFREG: | |
505 | inode->i_op = &hugetlbfs_inode_operations; | |
506 | inode->i_fop = &hugetlbfs_file_operations; | |
507 | break; | |
508 | case S_IFDIR: | |
509 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
510 | inode->i_fop = &simple_dir_operations; | |
511 | ||
512 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 513 | inc_nlink(inode); |
1da177e4 LT |
514 | break; |
515 | case S_IFLNK: | |
516 | inode->i_op = &page_symlink_inode_operations; | |
517 | break; | |
518 | } | |
e096d0c7 | 519 | lockdep_annotate_inode_mutex_key(inode); |
1da177e4 LT |
520 | } |
521 | return inode; | |
522 | } | |
523 | ||
524 | /* | |
525 | * File creation. Allocate an inode, and we're done.. | |
526 | */ | |
527 | static int hugetlbfs_mknod(struct inode *dir, | |
1a67aafb | 528 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
529 | { |
530 | struct inode *inode; | |
531 | int error = -ENOSPC; | |
7d54fa64 AV |
532 | |
533 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
1da177e4 LT |
534 | if (inode) { |
535 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
536 | d_instantiate(dentry, inode); | |
537 | dget(dentry); /* Extra count - pin the dentry in core */ | |
538 | error = 0; | |
539 | } | |
540 | return error; | |
541 | } | |
542 | ||
18bb1db3 | 543 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
544 | { |
545 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
546 | if (!retval) | |
d8c76e6f | 547 | inc_nlink(dir); |
1da177e4 LT |
548 | return retval; |
549 | } | |
550 | ||
ebfc3b49 | 551 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
552 | { |
553 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
554 | } | |
555 | ||
556 | static int hugetlbfs_symlink(struct inode *dir, | |
557 | struct dentry *dentry, const char *symname) | |
558 | { | |
559 | struct inode *inode; | |
560 | int error = -ENOSPC; | |
1da177e4 | 561 | |
7d54fa64 | 562 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
563 | if (inode) { |
564 | int l = strlen(symname)+1; | |
565 | error = page_symlink(inode, symname, l); | |
566 | if (!error) { | |
567 | d_instantiate(dentry, inode); | |
568 | dget(dentry); | |
569 | } else | |
570 | iput(inode); | |
571 | } | |
572 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
573 | ||
574 | return error; | |
575 | } | |
576 | ||
577 | /* | |
6649a386 | 578 | * mark the head page dirty |
1da177e4 LT |
579 | */ |
580 | static int hugetlbfs_set_page_dirty(struct page *page) | |
581 | { | |
d85f3385 | 582 | struct page *head = compound_head(page); |
6649a386 KC |
583 | |
584 | SetPageDirty(head); | |
1da177e4 LT |
585 | return 0; |
586 | } | |
587 | ||
290408d4 | 588 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
b969c4ab | 589 | struct page *newpage, struct page *page, |
a6bc32b8 | 590 | enum migrate_mode mode) |
290408d4 NH |
591 | { |
592 | int rc; | |
593 | ||
594 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); | |
78bd5209 | 595 | if (rc != MIGRATEPAGE_SUCCESS) |
290408d4 NH |
596 | return rc; |
597 | migrate_page_copy(newpage, page); | |
598 | ||
78bd5209 | 599 | return MIGRATEPAGE_SUCCESS; |
290408d4 NH |
600 | } |
601 | ||
726c3342 | 602 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 603 | { |
726c3342 | 604 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 605 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
606 | |
607 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 608 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
609 | if (sbinfo) { |
610 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
611 | /* If no limits set, just report 0 for max/free/used |
612 | * blocks, like simple_statfs() */ | |
90481622 DG |
613 | if (sbinfo->spool) { |
614 | long free_pages; | |
615 | ||
616 | spin_lock(&sbinfo->spool->lock); | |
617 | buf->f_blocks = sbinfo->spool->max_hpages; | |
618 | free_pages = sbinfo->spool->max_hpages | |
619 | - sbinfo->spool->used_hpages; | |
620 | buf->f_bavail = buf->f_bfree = free_pages; | |
621 | spin_unlock(&sbinfo->spool->lock); | |
74a8a65c DG |
622 | buf->f_files = sbinfo->max_inodes; |
623 | buf->f_ffree = sbinfo->free_inodes; | |
624 | } | |
1da177e4 LT |
625 | spin_unlock(&sbinfo->stat_lock); |
626 | } | |
627 | buf->f_namelen = NAME_MAX; | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static void hugetlbfs_put_super(struct super_block *sb) | |
632 | { | |
633 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
634 | ||
635 | if (sbi) { | |
636 | sb->s_fs_info = NULL; | |
90481622 DG |
637 | |
638 | if (sbi->spool) | |
639 | hugepage_put_subpool(sbi->spool); | |
640 | ||
1da177e4 LT |
641 | kfree(sbi); |
642 | } | |
643 | } | |
644 | ||
96527980 CH |
645 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
646 | { | |
647 | if (sbinfo->free_inodes >= 0) { | |
648 | spin_lock(&sbinfo->stat_lock); | |
649 | if (unlikely(!sbinfo->free_inodes)) { | |
650 | spin_unlock(&sbinfo->stat_lock); | |
651 | return 0; | |
652 | } | |
653 | sbinfo->free_inodes--; | |
654 | spin_unlock(&sbinfo->stat_lock); | |
655 | } | |
656 | ||
657 | return 1; | |
658 | } | |
659 | ||
660 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
661 | { | |
662 | if (sbinfo->free_inodes >= 0) { | |
663 | spin_lock(&sbinfo->stat_lock); | |
664 | sbinfo->free_inodes++; | |
665 | spin_unlock(&sbinfo->stat_lock); | |
666 | } | |
667 | } | |
668 | ||
669 | ||
e18b890b | 670 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
671 | |
672 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
673 | { | |
96527980 | 674 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
675 | struct hugetlbfs_inode_info *p; |
676 | ||
96527980 CH |
677 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
678 | return NULL; | |
e94b1766 | 679 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
680 | if (unlikely(!p)) { |
681 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 682 | return NULL; |
96527980 | 683 | } |
1da177e4 LT |
684 | return &p->vfs_inode; |
685 | } | |
686 | ||
fa0d7e3d NP |
687 | static void hugetlbfs_i_callback(struct rcu_head *head) |
688 | { | |
689 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
690 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
691 | } | |
692 | ||
1da177e4 LT |
693 | static void hugetlbfs_destroy_inode(struct inode *inode) |
694 | { | |
96527980 | 695 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 696 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
fa0d7e3d | 697 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
1da177e4 LT |
698 | } |
699 | ||
f5e54d6e | 700 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
701 | .write_begin = hugetlbfs_write_begin, |
702 | .write_end = hugetlbfs_write_end, | |
1da177e4 | 703 | .set_page_dirty = hugetlbfs_set_page_dirty, |
290408d4 | 704 | .migratepage = hugetlbfs_migrate_page, |
1da177e4 LT |
705 | }; |
706 | ||
96527980 | 707 | |
51cc5068 | 708 | static void init_once(void *foo) |
96527980 CH |
709 | { |
710 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
711 | ||
a35afb83 | 712 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
713 | } |
714 | ||
4b6f5d20 | 715 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 716 | .read = hugetlbfs_read, |
1da177e4 | 717 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 718 | .fsync = noop_fsync, |
1da177e4 | 719 | .get_unmapped_area = hugetlb_get_unmapped_area, |
6038f373 | 720 | .llseek = default_llseek, |
1da177e4 LT |
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, | |
2bbbda30 | 743 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 744 | .statfs = hugetlbfs_statfs, |
1da177e4 | 745 | .put_super = hugetlbfs_put_super, |
10f19a86 | 746 | .show_options = generic_show_options, |
1da177e4 LT |
747 | }; |
748 | ||
749 | static int | |
750 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
751 | { | |
e73a75fa RD |
752 | char *p, *rest; |
753 | substring_t args[MAX_OPT_ARGS]; | |
754 | int option; | |
a137e1cc AK |
755 | unsigned long long size = 0; |
756 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
757 | |
758 | if (!options) | |
759 | return 0; | |
1da177e4 | 760 | |
e73a75fa RD |
761 | while ((p = strsep(&options, ",")) != NULL) { |
762 | int token; | |
b4c07bce LS |
763 | if (!*p) |
764 | continue; | |
e73a75fa RD |
765 | |
766 | token = match_token(p, tokens, args); | |
767 | switch (token) { | |
768 | case Opt_uid: | |
769 | if (match_int(&args[0], &option)) | |
770 | goto bad_val; | |
a0eb3a05 EB |
771 | pconfig->uid = make_kuid(current_user_ns(), option); |
772 | if (!uid_valid(pconfig->uid)) | |
773 | goto bad_val; | |
e73a75fa RD |
774 | break; |
775 | ||
776 | case Opt_gid: | |
777 | if (match_int(&args[0], &option)) | |
778 | goto bad_val; | |
a0eb3a05 EB |
779 | pconfig->gid = make_kgid(current_user_ns(), option); |
780 | if (!gid_valid(pconfig->gid)) | |
781 | goto bad_val; | |
e73a75fa RD |
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); | |
c12ddba0 | 845 | return -EINVAL; |
1da177e4 LT |
846 | } |
847 | ||
848 | static int | |
849 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
850 | { | |
1da177e4 LT |
851 | int ret; |
852 | struct hugetlbfs_config config; | |
853 | struct hugetlbfs_sb_info *sbinfo; | |
854 | ||
10f19a86 MS |
855 | save_mount_options(sb, data); |
856 | ||
1da177e4 LT |
857 | config.nr_blocks = -1; /* No limit on size by default */ |
858 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
859 | config.uid = current_fsuid(); |
860 | config.gid = current_fsgid(); | |
1da177e4 | 861 | config.mode = 0755; |
a137e1cc | 862 | config.hstate = &default_hstate; |
1da177e4 | 863 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
864 | if (ret) |
865 | return ret; | |
866 | ||
867 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
868 | if (!sbinfo) | |
869 | return -ENOMEM; | |
870 | sb->s_fs_info = sbinfo; | |
a137e1cc | 871 | sbinfo->hstate = config.hstate; |
1da177e4 | 872 | spin_lock_init(&sbinfo->stat_lock); |
1da177e4 LT |
873 | sbinfo->max_inodes = config.nr_inodes; |
874 | sbinfo->free_inodes = config.nr_inodes; | |
90481622 DG |
875 | sbinfo->spool = NULL; |
876 | if (config.nr_blocks != -1) { | |
877 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); | |
878 | if (!sbinfo->spool) | |
879 | goto out_free; | |
880 | } | |
1da177e4 | 881 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
a137e1cc AK |
882 | sb->s_blocksize = huge_page_size(config.hstate); |
883 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
884 | sb->s_magic = HUGETLBFS_MAGIC; |
885 | sb->s_op = &hugetlbfs_ops; | |
886 | sb->s_time_gran = 1; | |
48fde701 AV |
887 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
888 | if (!sb->s_root) | |
1da177e4 | 889 | goto out_free; |
1da177e4 LT |
890 | return 0; |
891 | out_free: | |
90481622 DG |
892 | if (sbinfo->spool) |
893 | kfree(sbinfo->spool); | |
1da177e4 LT |
894 | kfree(sbinfo); |
895 | return -ENOMEM; | |
896 | } | |
897 | ||
3c26ff6e AV |
898 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
899 | int flags, const char *dev_name, void *data) | |
1da177e4 | 900 | { |
3c26ff6e | 901 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
1da177e4 LT |
902 | } |
903 | ||
904 | static struct file_system_type hugetlbfs_fs_type = { | |
905 | .name = "hugetlbfs", | |
3c26ff6e | 906 | .mount = hugetlbfs_mount, |
1da177e4 LT |
907 | .kill_sb = kill_litter_super, |
908 | }; | |
7f78e035 | 909 | MODULE_ALIAS_FS("hugetlbfs"); |
1da177e4 | 910 | |
42d7395f | 911 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
1da177e4 | 912 | |
ef1ff6b8 | 913 | static int can_do_hugetlb_shm(void) |
1da177e4 | 914 | { |
a0eb3a05 EB |
915 | kgid_t shm_group; |
916 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); | |
917 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); | |
1da177e4 LT |
918 | } |
919 | ||
42d7395f AK |
920 | static int get_hstate_idx(int page_size_log) |
921 | { | |
af73e4d9 | 922 | struct hstate *h = hstate_sizelog(page_size_log); |
42d7395f | 923 | |
42d7395f AK |
924 | if (!h) |
925 | return -1; | |
926 | return h - hstates; | |
927 | } | |
928 | ||
0df4d6e5 AV |
929 | static char *hugetlb_dname(struct dentry *dentry, char *buffer, int buflen) |
930 | { | |
931 | return dynamic_dname(dentry, buffer, buflen, "/%s (deleted)", | |
932 | dentry->d_name.name); | |
933 | } | |
934 | ||
935 | static struct dentry_operations anon_ops = { | |
936 | .d_dname = hugetlb_dname | |
937 | }; | |
938 | ||
af73e4d9 NH |
939 | /* |
940 | * Note that size should be aligned to proper hugepage size in caller side, | |
941 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. | |
942 | */ | |
943 | struct file *hugetlb_file_setup(const char *name, size_t size, | |
944 | vm_flags_t acctflag, struct user_struct **user, | |
42d7395f | 945 | int creat_flags, int page_size_log) |
1da177e4 | 946 | { |
39b65252 | 947 | struct file *file = ERR_PTR(-ENOMEM); |
1da177e4 | 948 | struct inode *inode; |
2c48b9c4 | 949 | struct path path; |
0df4d6e5 | 950 | struct super_block *sb; |
1da177e4 | 951 | struct qstr quick_string; |
42d7395f AK |
952 | int hstate_idx; |
953 | ||
954 | hstate_idx = get_hstate_idx(page_size_log); | |
955 | if (hstate_idx < 0) | |
956 | return ERR_PTR(-ENODEV); | |
1da177e4 | 957 | |
353d5c30 | 958 | *user = NULL; |
42d7395f | 959 | if (!hugetlbfs_vfsmount[hstate_idx]) |
5bc98594 AM |
960 | return ERR_PTR(-ENOENT); |
961 | ||
ef1ff6b8 | 962 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
353d5c30 HD |
963 | *user = current_user(); |
964 | if (user_shm_lock(size, *user)) { | |
21a3c273 DR |
965 | task_lock(current); |
966 | printk_once(KERN_WARNING | |
967 | "%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", | |
968 | current->comm, current->pid); | |
969 | task_unlock(current); | |
353d5c30 HD |
970 | } else { |
971 | *user = NULL; | |
2584e517 | 972 | return ERR_PTR(-EPERM); |
353d5c30 | 973 | } |
2584e517 | 974 | } |
1da177e4 | 975 | |
0df4d6e5 | 976 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
9d66586f | 977 | quick_string.name = name; |
1da177e4 LT |
978 | quick_string.len = strlen(quick_string.name); |
979 | quick_string.hash = 0; | |
0df4d6e5 | 980 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
2c48b9c4 | 981 | if (!path.dentry) |
1da177e4 LT |
982 | goto out_shm_unlock; |
983 | ||
0df4d6e5 | 984 | d_set_d_op(path.dentry, &anon_ops); |
42d7395f | 985 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
39b65252 | 986 | file = ERR_PTR(-ENOSPC); |
0df4d6e5 | 987 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 988 | if (!inode) |
ce8d2cdf | 989 | goto out_dentry; |
1da177e4 | 990 | |
39b65252 | 991 | file = ERR_PTR(-ENOMEM); |
af73e4d9 NH |
992 | if (hugetlb_reserve_pages(inode, 0, |
993 | size >> huge_page_shift(hstate_inode(inode)), NULL, | |
994 | acctflag)) | |
b45b5bd6 DG |
995 | goto out_inode; |
996 | ||
2c48b9c4 | 997 | d_instantiate(path.dentry, inode); |
1da177e4 | 998 | inode->i_size = size; |
6d6b77f1 | 999 | clear_nlink(inode); |
ce8d2cdf | 1000 | |
2c48b9c4 | 1001 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
ce8d2cdf | 1002 | &hugetlbfs_file_operations); |
39b65252 | 1003 | if (IS_ERR(file)) |
b4d232e6 | 1004 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 1005 | |
1da177e4 LT |
1006 | return file; |
1007 | ||
b45b5bd6 DG |
1008 | out_inode: |
1009 | iput(inode); | |
1da177e4 | 1010 | out_dentry: |
2c48b9c4 | 1011 | path_put(&path); |
1da177e4 | 1012 | out_shm_unlock: |
353d5c30 HD |
1013 | if (*user) { |
1014 | user_shm_unlock(size, *user); | |
1015 | *user = NULL; | |
1016 | } | |
39b65252 | 1017 | return file; |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | static int __init init_hugetlbfs_fs(void) | |
1021 | { | |
42d7395f | 1022 | struct hstate *h; |
1da177e4 | 1023 | int error; |
42d7395f | 1024 | int i; |
1da177e4 | 1025 | |
e0bf68dd PZ |
1026 | error = bdi_init(&hugetlbfs_backing_dev_info); |
1027 | if (error) | |
1028 | return error; | |
1029 | ||
d1d5e05f | 1030 | error = -ENOMEM; |
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 | ||
42d7395f AK |
1041 | i = 0; |
1042 | for_each_hstate(h) { | |
1043 | char buf[50]; | |
1044 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); | |
1da177e4 | 1045 | |
42d7395f AK |
1046 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
1047 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, | |
1048 | buf); | |
1da177e4 | 1049 | |
42d7395f AK |
1050 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
1051 | pr_err("hugetlb: Cannot mount internal hugetlbfs for " | |
1052 | "page size %uK", ps_kb); | |
1053 | error = PTR_ERR(hugetlbfs_vfsmount[i]); | |
1054 | hugetlbfs_vfsmount[i] = NULL; | |
1055 | } | |
1056 | i++; | |
1057 | } | |
1058 | /* Non default hstates are optional */ | |
1059 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) | |
1060 | return 0; | |
1da177e4 LT |
1061 | |
1062 | out: | |
d1d5e05f | 1063 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
e0bf68dd PZ |
1064 | out2: |
1065 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1066 | return error; |
1067 | } | |
1068 | ||
1069 | static void __exit exit_hugetlbfs_fs(void) | |
1070 | { | |
42d7395f AK |
1071 | struct hstate *h; |
1072 | int i; | |
1073 | ||
1074 | ||
8c0a8537 KS |
1075 | /* |
1076 | * Make sure all delayed rcu free inodes are flushed before we | |
1077 | * destroy cache. | |
1078 | */ | |
1079 | rcu_barrier(); | |
1da177e4 | 1080 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
42d7395f AK |
1081 | i = 0; |
1082 | for_each_hstate(h) | |
1083 | kern_unmount(hugetlbfs_vfsmount[i++]); | |
1da177e4 | 1084 | unregister_filesystem(&hugetlbfs_fs_type); |
e0bf68dd | 1085 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | module_init(init_hugetlbfs_fs) | |
1089 | module_exit(exit_hugetlbfs_fs) | |
1090 | ||
1091 | MODULE_LICENSE("GPL"); |