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 | ||
9b857d26 AM |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/thread_info.h> | |
13 | #include <asm/current.h> | |
14 | #include <linux/sched.h> /* remove ASAP */ | |
15 | #include <linux/fs.h> | |
16 | #include <linux/mount.h> | |
17 | #include <linux/file.h> | |
e73a75fa | 18 | #include <linux/kernel.h> |
1da177e4 LT |
19 | #include <linux/writeback.h> |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/string.h> | |
16f7e0fe | 24 | #include <linux/capability.h> |
e73a75fa | 25 | #include <linux/ctype.h> |
1da177e4 LT |
26 | #include <linux/backing-dev.h> |
27 | #include <linux/hugetlb.h> | |
28 | #include <linux/pagevec.h> | |
e73a75fa | 29 | #include <linux/parser.h> |
036e0856 | 30 | #include <linux/mman.h> |
1da177e4 LT |
31 | #include <linux/slab.h> |
32 | #include <linux/dnotify.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/security.h> | |
1fd7317d | 35 | #include <linux/magic.h> |
290408d4 | 36 | #include <linux/migrate.h> |
1da177e4 LT |
37 | |
38 | #include <asm/uaccess.h> | |
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 | 45 | |
a1d776ee | 46 | struct hugetlbfs_config { |
a0eb3a05 EB |
47 | kuid_t uid; |
48 | kgid_t gid; | |
a1d776ee DG |
49 | umode_t mode; |
50 | long nr_blocks; | |
51 | long nr_inodes; | |
52 | struct hstate *hstate; | |
53 | }; | |
54 | ||
55 | struct hugetlbfs_inode_info { | |
56 | struct shared_policy policy; | |
57 | struct inode vfs_inode; | |
58 | }; | |
59 | ||
60 | static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) | |
61 | { | |
62 | return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); | |
63 | } | |
64 | ||
1da177e4 LT |
65 | int sysctl_hugetlb_shm_group; |
66 | ||
e73a75fa RD |
67 | enum { |
68 | Opt_size, Opt_nr_inodes, | |
69 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 70 | Opt_pagesize, |
e73a75fa RD |
71 | Opt_err, |
72 | }; | |
73 | ||
a447c093 | 74 | static const match_table_t tokens = { |
e73a75fa RD |
75 | {Opt_size, "size=%s"}, |
76 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
77 | {Opt_mode, "mode=%o"}, | |
78 | {Opt_uid, "uid=%u"}, | |
79 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 80 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
81 | {Opt_err, NULL}, |
82 | }; | |
83 | ||
2e9b367c AL |
84 | static void huge_pagevec_release(struct pagevec *pvec) |
85 | { | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < pagevec_count(pvec); ++i) | |
89 | put_page(pvec->pages[i]); | |
90 | ||
91 | pagevec_reinit(pvec); | |
92 | } | |
93 | ||
1da177e4 LT |
94 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
95 | { | |
496ad9aa | 96 | struct inode *inode = file_inode(file); |
1da177e4 LT |
97 | loff_t len, vma_len; |
98 | int ret; | |
a5516438 | 99 | struct hstate *h = hstate_file(file); |
1da177e4 | 100 | |
68589bc3 | 101 | /* |
dec4ad86 DG |
102 | * vma address alignment (but not the pgoff alignment) has |
103 | * already been checked by prepare_hugepage_range. If you add | |
104 | * any error returns here, do so after setting VM_HUGETLB, so | |
105 | * is_vm_hugetlb_page tests below unmap_region go the right | |
106 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
107 | * and ia64). | |
68589bc3 | 108 | */ |
a2fce914 | 109 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
68589bc3 | 110 | vma->vm_ops = &hugetlb_vm_ops; |
1da177e4 | 111 | |
2b37c35e | 112 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
113 | return -EINVAL; |
114 | ||
1da177e4 LT |
115 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
116 | ||
1b1dcc1b | 117 | mutex_lock(&inode->i_mutex); |
1da177e4 | 118 | file_accessed(file); |
1da177e4 LT |
119 | |
120 | ret = -ENOMEM; | |
121 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 122 | |
a1e78772 | 123 | if (hugetlb_reserve_pages(inode, |
a5516438 | 124 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
125 | len >> huge_page_shift(h), vma, |
126 | vma->vm_flags)) | |
a43a8c39 | 127 | goto out; |
b45b5bd6 | 128 | |
4c887265 AL |
129 | ret = 0; |
130 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 131 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
132 | inode->i_size = len; |
133 | out: | |
1b1dcc1b | 134 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
135 | |
136 | return ret; | |
137 | } | |
138 | ||
139 | /* | |
508034a3 | 140 | * Called under down_write(mmap_sem). |
1da177e4 LT |
141 | */ |
142 | ||
d2ba27e8 | 143 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
144 | static unsigned long |
145 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
146 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
147 | { | |
148 | struct mm_struct *mm = current->mm; | |
149 | struct vm_area_struct *vma; | |
a5516438 | 150 | struct hstate *h = hstate_file(file); |
08659355 | 151 | struct vm_unmapped_area_info info; |
1da177e4 | 152 | |
a5516438 | 153 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
154 | return -EINVAL; |
155 | if (len > TASK_SIZE) | |
156 | return -ENOMEM; | |
157 | ||
036e0856 | 158 | if (flags & MAP_FIXED) { |
a5516438 | 159 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
160 | return -EINVAL; |
161 | return addr; | |
162 | } | |
163 | ||
1da177e4 | 164 | if (addr) { |
a5516438 | 165 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
166 | vma = find_vma(mm, addr); |
167 | if (TASK_SIZE - len >= addr && | |
168 | (!vma || addr + len <= vma->vm_start)) | |
169 | return addr; | |
170 | } | |
171 | ||
08659355 ML |
172 | info.flags = 0; |
173 | info.length = len; | |
174 | info.low_limit = TASK_UNMAPPED_BASE; | |
175 | info.high_limit = TASK_SIZE; | |
176 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
177 | info.align_offset = 0; | |
178 | return vm_unmapped_area(&info); | |
1da177e4 LT |
179 | } |
180 | #endif | |
181 | ||
e63e1e5a BP |
182 | static int |
183 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
184 | char __user *buf, unsigned long count, | |
185 | unsigned long size) | |
186 | { | |
187 | char *kaddr; | |
188 | unsigned long left, copied = 0; | |
189 | int i, chunksize; | |
190 | ||
191 | if (size > count) | |
192 | size = count; | |
193 | ||
194 | /* Find which 4k chunk and offset with in that chunk */ | |
195 | i = offset >> PAGE_CACHE_SHIFT; | |
196 | offset = offset & ~PAGE_CACHE_MASK; | |
197 | ||
198 | while (size) { | |
199 | chunksize = PAGE_CACHE_SIZE; | |
200 | if (offset) | |
201 | chunksize -= offset; | |
202 | if (chunksize > size) | |
203 | chunksize = size; | |
204 | kaddr = kmap(&page[i]); | |
205 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
206 | kunmap(&page[i]); | |
207 | if (left) { | |
208 | copied += (chunksize - left); | |
209 | break; | |
210 | } | |
211 | offset = 0; | |
212 | size -= chunksize; | |
213 | buf += chunksize; | |
214 | copied += chunksize; | |
215 | i++; | |
216 | } | |
217 | return copied ? copied : -EFAULT; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Support for read() - Find the page attached to f_mapping and copy out the | |
222 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
223 | * since it has PAGE_CACHE_SIZE assumptions. | |
224 | */ | |
225 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
226 | size_t len, loff_t *ppos) | |
227 | { | |
a5516438 | 228 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
229 | struct address_space *mapping = filp->f_mapping; |
230 | struct inode *inode = mapping->host; | |
a5516438 AK |
231 | unsigned long index = *ppos >> huge_page_shift(h); |
232 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
233 | unsigned long end_index; |
234 | loff_t isize; | |
235 | ssize_t retval = 0; | |
236 | ||
e63e1e5a BP |
237 | /* validate length */ |
238 | if (len == 0) | |
239 | goto out; | |
240 | ||
e63e1e5a BP |
241 | for (;;) { |
242 | struct page *page; | |
a5516438 | 243 | unsigned long nr, ret; |
91bf189c | 244 | int ra; |
e63e1e5a BP |
245 | |
246 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 247 | nr = huge_page_size(h); |
a05b0855 AK |
248 | isize = i_size_read(inode); |
249 | if (!isize) | |
250 | goto out; | |
251 | end_index = (isize - 1) >> huge_page_shift(h); | |
e63e1e5a BP |
252 | if (index >= end_index) { |
253 | if (index > end_index) | |
254 | goto out; | |
a5516438 | 255 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 256 | if (nr <= offset) |
e63e1e5a | 257 | goto out; |
e63e1e5a BP |
258 | } |
259 | nr = nr - offset; | |
260 | ||
261 | /* Find the page */ | |
a05b0855 | 262 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
263 | if (unlikely(page == NULL)) { |
264 | /* | |
265 | * We have a HOLE, zero out the user-buffer for the | |
266 | * length of the hole or request. | |
267 | */ | |
268 | ret = len < nr ? len : nr; | |
269 | if (clear_user(buf, ret)) | |
91bf189c RK |
270 | ra = -EFAULT; |
271 | else | |
272 | ra = 0; | |
e63e1e5a | 273 | } else { |
a05b0855 AK |
274 | unlock_page(page); |
275 | ||
e63e1e5a BP |
276 | /* |
277 | * We have the page, copy it to user space buffer. | |
278 | */ | |
91bf189c RK |
279 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
280 | ret = ra; | |
a05b0855 | 281 | page_cache_release(page); |
e63e1e5a | 282 | } |
91bf189c | 283 | if (ra < 0) { |
e63e1e5a | 284 | if (retval == 0) |
91bf189c | 285 | retval = ra; |
e63e1e5a BP |
286 | goto out; |
287 | } | |
288 | ||
289 | offset += ret; | |
290 | retval += ret; | |
291 | len -= ret; | |
a5516438 AK |
292 | index += offset >> huge_page_shift(h); |
293 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 294 | |
e63e1e5a BP |
295 | /* short read or no more work */ |
296 | if ((ret != nr) || (len == 0)) | |
297 | break; | |
298 | } | |
299 | out: | |
a5516438 | 300 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
301 | return retval; |
302 | } | |
303 | ||
800d15a5 NP |
304 | static int hugetlbfs_write_begin(struct file *file, |
305 | struct address_space *mapping, | |
306 | loff_t pos, unsigned len, unsigned flags, | |
307 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
308 | { |
309 | return -EINVAL; | |
310 | } | |
311 | ||
800d15a5 NP |
312 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
313 | loff_t pos, unsigned len, unsigned copied, | |
314 | struct page *page, void *fsdata) | |
1da177e4 | 315 | { |
800d15a5 | 316 | BUG(); |
1da177e4 LT |
317 | return -EINVAL; |
318 | } | |
319 | ||
1da177e4 LT |
320 | static void truncate_huge_page(struct page *page) |
321 | { | |
fba2591b | 322 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 | 323 | ClearPageUptodate(page); |
bd65cb86 | 324 | delete_from_page_cache(page); |
1da177e4 LT |
325 | } |
326 | ||
b45b5bd6 | 327 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 328 | { |
a5516438 | 329 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 330 | struct address_space *mapping = &inode->i_data; |
a5516438 | 331 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
332 | struct pagevec pvec; |
333 | pgoff_t next; | |
a43a8c39 | 334 | int i, freed = 0; |
1da177e4 LT |
335 | |
336 | pagevec_init(&pvec, 0); | |
337 | next = start; | |
338 | while (1) { | |
339 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
340 | if (next == start) | |
341 | break; | |
342 | next = start; | |
343 | continue; | |
344 | } | |
345 | ||
346 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
347 | struct page *page = pvec.pages[i]; | |
348 | ||
349 | lock_page(page); | |
350 | if (page->index > next) | |
351 | next = page->index; | |
352 | ++next; | |
353 | truncate_huge_page(page); | |
354 | unlock_page(page); | |
a43a8c39 | 355 | freed++; |
1da177e4 LT |
356 | } |
357 | huge_pagevec_release(&pvec); | |
358 | } | |
359 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 360 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
361 | } |
362 | ||
2bbbda30 | 363 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 364 | { |
9119a41e JK |
365 | struct resv_map *resv_map; |
366 | ||
b45b5bd6 | 367 | truncate_hugepages(inode, 0); |
9119a41e JK |
368 | resv_map = (struct resv_map *)inode->i_mapping->private_data; |
369 | /* root inode doesn't have the resv_map, so we should check it */ | |
370 | if (resv_map) | |
371 | resv_map_release(&resv_map->refs); | |
dbd5768f | 372 | clear_inode(inode); |
149f4211 CH |
373 | } |
374 | ||
1da177e4 | 375 | static inline void |
6b2dbba8 | 376 | hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) |
1da177e4 LT |
377 | { |
378 | struct vm_area_struct *vma; | |
1da177e4 | 379 | |
6b2dbba8 | 380 | vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
381 | unsigned long v_offset; |
382 | ||
1da177e4 | 383 | /* |
856fc295 | 384 | * Can the expression below overflow on 32-bit arches? |
6b2dbba8 | 385 | * No, because the interval tree returns us only those vmas |
856fc295 HD |
386 | * which overlap the truncated area starting at pgoff, |
387 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 388 | */ |
856fc295 HD |
389 | if (vma->vm_pgoff < pgoff) |
390 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
391 | else | |
1da177e4 LT |
392 | v_offset = 0; |
393 | ||
24669e58 AK |
394 | unmap_hugepage_range(vma, vma->vm_start + v_offset, |
395 | vma->vm_end, NULL); | |
1da177e4 LT |
396 | } |
397 | } | |
398 | ||
1da177e4 LT |
399 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
400 | { | |
856fc295 | 401 | pgoff_t pgoff; |
1da177e4 | 402 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 403 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 404 | |
a5516438 | 405 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 406 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 407 | |
7aa91e10 | 408 | i_size_write(inode, offset); |
83cde9e8 | 409 | i_mmap_lock_write(mapping); |
6b2dbba8 | 410 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
1da177e4 | 411 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
83cde9e8 | 412 | i_mmap_unlock_write(mapping); |
b45b5bd6 | 413 | truncate_hugepages(inode, offset); |
1da177e4 LT |
414 | return 0; |
415 | } | |
416 | ||
417 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
418 | { | |
419 | struct inode *inode = dentry->d_inode; | |
a5516438 | 420 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
421 | int error; |
422 | unsigned int ia_valid = attr->ia_valid; | |
423 | ||
424 | BUG_ON(!inode); | |
425 | ||
426 | error = inode_change_ok(inode, attr); | |
427 | if (error) | |
1025774c | 428 | return error; |
1da177e4 LT |
429 | |
430 | if (ia_valid & ATTR_SIZE) { | |
431 | error = -EINVAL; | |
1025774c CH |
432 | if (attr->ia_size & ~huge_page_mask(h)) |
433 | return -EINVAL; | |
434 | error = hugetlb_vmtruncate(inode, attr->ia_size); | |
1da177e4 | 435 | if (error) |
1025774c | 436 | return error; |
1da177e4 | 437 | } |
1025774c CH |
438 | |
439 | setattr_copy(inode, attr); | |
440 | mark_inode_dirty(inode); | |
441 | return 0; | |
1da177e4 LT |
442 | } |
443 | ||
7d54fa64 AV |
444 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
445 | struct hugetlbfs_config *config) | |
1da177e4 LT |
446 | { |
447 | struct inode *inode; | |
1da177e4 LT |
448 | |
449 | inode = new_inode(sb); | |
450 | if (inode) { | |
451 | struct hugetlbfs_inode_info *info; | |
85fe4025 | 452 | inode->i_ino = get_next_ino(); |
7d54fa64 AV |
453 | inode->i_mode = S_IFDIR | config->mode; |
454 | inode->i_uid = config->uid; | |
455 | inode->i_gid = config->gid; | |
456 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
457 | info = HUGETLBFS_I(inode); | |
458 | mpol_shared_policy_init(&info->policy, NULL); | |
459 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
460 | inode->i_fop = &simple_dir_operations; | |
461 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
462 | inc_nlink(inode); | |
65ed7601 | 463 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
464 | } |
465 | return inode; | |
466 | } | |
467 | ||
b610ded7 | 468 | /* |
c8c06efa | 469 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
b610ded7 MH |
470 | * be taken from reclaim -- unlike regular filesystems. This needs an |
471 | * annotation because huge_pmd_share() does an allocation under | |
c8c06efa | 472 | * i_mmap_rwsem. |
b610ded7 | 473 | */ |
c8c06efa | 474 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
b610ded7 | 475 | |
7d54fa64 AV |
476 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
477 | struct inode *dir, | |
18df2252 | 478 | umode_t mode, dev_t dev) |
7d54fa64 AV |
479 | { |
480 | struct inode *inode; | |
9119a41e JK |
481 | struct resv_map *resv_map; |
482 | ||
483 | resv_map = resv_map_alloc(); | |
484 | if (!resv_map) | |
485 | return NULL; | |
7d54fa64 AV |
486 | |
487 | inode = new_inode(sb); | |
488 | if (inode) { | |
489 | struct hugetlbfs_inode_info *info; | |
490 | inode->i_ino = get_next_ino(); | |
491 | inode_init_owner(inode, dir, mode); | |
c8c06efa DB |
492 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
493 | &hugetlbfs_i_mmap_rwsem_key); | |
1da177e4 | 494 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
1da177e4 | 495 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
9119a41e | 496 | inode->i_mapping->private_data = resv_map; |
1da177e4 | 497 | info = HUGETLBFS_I(inode); |
6bfde05b EM |
498 | /* |
499 | * The policy is initialized here even if we are creating a | |
500 | * private inode because initialization simply creates an | |
501 | * an empty rb tree and calls spin_lock_init(), later when we | |
502 | * call mpol_free_shared_policy() it will just return because | |
503 | * the rb tree will still be empty. | |
504 | */ | |
71fe804b | 505 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
506 | switch (mode & S_IFMT) { |
507 | default: | |
508 | init_special_inode(inode, mode, dev); | |
509 | break; | |
510 | case S_IFREG: | |
511 | inode->i_op = &hugetlbfs_inode_operations; | |
512 | inode->i_fop = &hugetlbfs_file_operations; | |
513 | break; | |
514 | case S_IFDIR: | |
515 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
516 | inode->i_fop = &simple_dir_operations; | |
517 | ||
518 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 519 | inc_nlink(inode); |
1da177e4 LT |
520 | break; |
521 | case S_IFLNK: | |
522 | inode->i_op = &page_symlink_inode_operations; | |
523 | break; | |
524 | } | |
e096d0c7 | 525 | lockdep_annotate_inode_mutex_key(inode); |
9119a41e JK |
526 | } else |
527 | kref_put(&resv_map->refs, resv_map_release); | |
528 | ||
1da177e4 LT |
529 | return inode; |
530 | } | |
531 | ||
532 | /* | |
533 | * File creation. Allocate an inode, and we're done.. | |
534 | */ | |
535 | static int hugetlbfs_mknod(struct inode *dir, | |
1a67aafb | 536 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
537 | { |
538 | struct inode *inode; | |
539 | int error = -ENOSPC; | |
7d54fa64 AV |
540 | |
541 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
1da177e4 LT |
542 | if (inode) { |
543 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
544 | d_instantiate(dentry, inode); | |
545 | dget(dentry); /* Extra count - pin the dentry in core */ | |
546 | error = 0; | |
547 | } | |
548 | return error; | |
549 | } | |
550 | ||
18bb1db3 | 551 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
552 | { |
553 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
554 | if (!retval) | |
d8c76e6f | 555 | inc_nlink(dir); |
1da177e4 LT |
556 | return retval; |
557 | } | |
558 | ||
ebfc3b49 | 559 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
560 | { |
561 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
562 | } | |
563 | ||
564 | static int hugetlbfs_symlink(struct inode *dir, | |
565 | struct dentry *dentry, const char *symname) | |
566 | { | |
567 | struct inode *inode; | |
568 | int error = -ENOSPC; | |
1da177e4 | 569 | |
7d54fa64 | 570 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
571 | if (inode) { |
572 | int l = strlen(symname)+1; | |
573 | error = page_symlink(inode, symname, l); | |
574 | if (!error) { | |
575 | d_instantiate(dentry, inode); | |
576 | dget(dentry); | |
577 | } else | |
578 | iput(inode); | |
579 | } | |
580 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
581 | ||
582 | return error; | |
583 | } | |
584 | ||
585 | /* | |
6649a386 | 586 | * mark the head page dirty |
1da177e4 LT |
587 | */ |
588 | static int hugetlbfs_set_page_dirty(struct page *page) | |
589 | { | |
d85f3385 | 590 | struct page *head = compound_head(page); |
6649a386 KC |
591 | |
592 | SetPageDirty(head); | |
1da177e4 LT |
593 | return 0; |
594 | } | |
595 | ||
290408d4 | 596 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
b969c4ab | 597 | struct page *newpage, struct page *page, |
a6bc32b8 | 598 | enum migrate_mode mode) |
290408d4 NH |
599 | { |
600 | int rc; | |
601 | ||
602 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); | |
78bd5209 | 603 | if (rc != MIGRATEPAGE_SUCCESS) |
290408d4 NH |
604 | return rc; |
605 | migrate_page_copy(newpage, page); | |
606 | ||
78bd5209 | 607 | return MIGRATEPAGE_SUCCESS; |
290408d4 NH |
608 | } |
609 | ||
726c3342 | 610 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 611 | { |
726c3342 | 612 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 613 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
614 | |
615 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 616 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
617 | if (sbinfo) { |
618 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
619 | /* If no limits set, just report 0 for max/free/used |
620 | * blocks, like simple_statfs() */ | |
90481622 DG |
621 | if (sbinfo->spool) { |
622 | long free_pages; | |
623 | ||
624 | spin_lock(&sbinfo->spool->lock); | |
625 | buf->f_blocks = sbinfo->spool->max_hpages; | |
626 | free_pages = sbinfo->spool->max_hpages | |
627 | - sbinfo->spool->used_hpages; | |
628 | buf->f_bavail = buf->f_bfree = free_pages; | |
629 | spin_unlock(&sbinfo->spool->lock); | |
74a8a65c DG |
630 | buf->f_files = sbinfo->max_inodes; |
631 | buf->f_ffree = sbinfo->free_inodes; | |
632 | } | |
1da177e4 LT |
633 | spin_unlock(&sbinfo->stat_lock); |
634 | } | |
635 | buf->f_namelen = NAME_MAX; | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static void hugetlbfs_put_super(struct super_block *sb) | |
640 | { | |
641 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
642 | ||
643 | if (sbi) { | |
644 | sb->s_fs_info = NULL; | |
90481622 DG |
645 | |
646 | if (sbi->spool) | |
647 | hugepage_put_subpool(sbi->spool); | |
648 | ||
1da177e4 LT |
649 | kfree(sbi); |
650 | } | |
651 | } | |
652 | ||
96527980 CH |
653 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
654 | { | |
655 | if (sbinfo->free_inodes >= 0) { | |
656 | spin_lock(&sbinfo->stat_lock); | |
657 | if (unlikely(!sbinfo->free_inodes)) { | |
658 | spin_unlock(&sbinfo->stat_lock); | |
659 | return 0; | |
660 | } | |
661 | sbinfo->free_inodes--; | |
662 | spin_unlock(&sbinfo->stat_lock); | |
663 | } | |
664 | ||
665 | return 1; | |
666 | } | |
667 | ||
668 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
669 | { | |
670 | if (sbinfo->free_inodes >= 0) { | |
671 | spin_lock(&sbinfo->stat_lock); | |
672 | sbinfo->free_inodes++; | |
673 | spin_unlock(&sbinfo->stat_lock); | |
674 | } | |
675 | } | |
676 | ||
677 | ||
e18b890b | 678 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
679 | |
680 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
681 | { | |
96527980 | 682 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
683 | struct hugetlbfs_inode_info *p; |
684 | ||
96527980 CH |
685 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
686 | return NULL; | |
e94b1766 | 687 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
688 | if (unlikely(!p)) { |
689 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 690 | return NULL; |
96527980 | 691 | } |
1da177e4 LT |
692 | return &p->vfs_inode; |
693 | } | |
694 | ||
fa0d7e3d NP |
695 | static void hugetlbfs_i_callback(struct rcu_head *head) |
696 | { | |
697 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
698 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
699 | } | |
700 | ||
1da177e4 LT |
701 | static void hugetlbfs_destroy_inode(struct inode *inode) |
702 | { | |
96527980 | 703 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 704 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
fa0d7e3d | 705 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
1da177e4 LT |
706 | } |
707 | ||
f5e54d6e | 708 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
709 | .write_begin = hugetlbfs_write_begin, |
710 | .write_end = hugetlbfs_write_end, | |
1da177e4 | 711 | .set_page_dirty = hugetlbfs_set_page_dirty, |
290408d4 | 712 | .migratepage = hugetlbfs_migrate_page, |
1da177e4 LT |
713 | }; |
714 | ||
96527980 | 715 | |
51cc5068 | 716 | static void init_once(void *foo) |
96527980 CH |
717 | { |
718 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
719 | ||
a35afb83 | 720 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
721 | } |
722 | ||
4b6f5d20 | 723 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 724 | .read = hugetlbfs_read, |
1da177e4 | 725 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 726 | .fsync = noop_fsync, |
1da177e4 | 727 | .get_unmapped_area = hugetlb_get_unmapped_area, |
6038f373 | 728 | .llseek = default_llseek, |
1da177e4 LT |
729 | }; |
730 | ||
92e1d5be | 731 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
732 | .create = hugetlbfs_create, |
733 | .lookup = simple_lookup, | |
734 | .link = simple_link, | |
735 | .unlink = simple_unlink, | |
736 | .symlink = hugetlbfs_symlink, | |
737 | .mkdir = hugetlbfs_mkdir, | |
738 | .rmdir = simple_rmdir, | |
739 | .mknod = hugetlbfs_mknod, | |
740 | .rename = simple_rename, | |
741 | .setattr = hugetlbfs_setattr, | |
742 | }; | |
743 | ||
92e1d5be | 744 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
745 | .setattr = hugetlbfs_setattr, |
746 | }; | |
747 | ||
ee9b6d61 | 748 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
749 | .alloc_inode = hugetlbfs_alloc_inode, |
750 | .destroy_inode = hugetlbfs_destroy_inode, | |
2bbbda30 | 751 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 752 | .statfs = hugetlbfs_statfs, |
1da177e4 | 753 | .put_super = hugetlbfs_put_super, |
10f19a86 | 754 | .show_options = generic_show_options, |
1da177e4 LT |
755 | }; |
756 | ||
757 | static int | |
758 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
759 | { | |
e73a75fa RD |
760 | char *p, *rest; |
761 | substring_t args[MAX_OPT_ARGS]; | |
762 | int option; | |
a137e1cc AK |
763 | unsigned long long size = 0; |
764 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
765 | |
766 | if (!options) | |
767 | return 0; | |
1da177e4 | 768 | |
e73a75fa RD |
769 | while ((p = strsep(&options, ",")) != NULL) { |
770 | int token; | |
b4c07bce LS |
771 | if (!*p) |
772 | continue; | |
e73a75fa RD |
773 | |
774 | token = match_token(p, tokens, args); | |
775 | switch (token) { | |
776 | case Opt_uid: | |
777 | if (match_int(&args[0], &option)) | |
778 | goto bad_val; | |
a0eb3a05 EB |
779 | pconfig->uid = make_kuid(current_user_ns(), option); |
780 | if (!uid_valid(pconfig->uid)) | |
781 | goto bad_val; | |
e73a75fa RD |
782 | break; |
783 | ||
784 | case Opt_gid: | |
785 | if (match_int(&args[0], &option)) | |
786 | goto bad_val; | |
a0eb3a05 EB |
787 | pconfig->gid = make_kgid(current_user_ns(), option); |
788 | if (!gid_valid(pconfig->gid)) | |
789 | goto bad_val; | |
e73a75fa RD |
790 | break; |
791 | ||
792 | case Opt_mode: | |
793 | if (match_octal(&args[0], &option)) | |
794 | goto bad_val; | |
75897d60 | 795 | pconfig->mode = option & 01777U; |
e73a75fa RD |
796 | break; |
797 | ||
798 | case Opt_size: { | |
e73a75fa RD |
799 | /* memparse() will accept a K/M/G without a digit */ |
800 | if (!isdigit(*args[0].from)) | |
801 | goto bad_val; | |
802 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
803 | setsize = SIZE_STD; |
804 | if (*rest == '%') | |
805 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
806 | break; |
807 | } | |
1da177e4 | 808 | |
e73a75fa RD |
809 | case Opt_nr_inodes: |
810 | /* memparse() will accept a K/M/G without a digit */ | |
811 | if (!isdigit(*args[0].from)) | |
812 | goto bad_val; | |
813 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
814 | break; | |
815 | ||
a137e1cc AK |
816 | case Opt_pagesize: { |
817 | unsigned long ps; | |
818 | ps = memparse(args[0].from, &rest); | |
819 | pconfig->hstate = size_to_hstate(ps); | |
820 | if (!pconfig->hstate) { | |
9b857d26 | 821 | pr_err("Unsupported page size %lu MB\n", |
a137e1cc AK |
822 | ps >> 20); |
823 | return -EINVAL; | |
824 | } | |
825 | break; | |
826 | } | |
827 | ||
e73a75fa | 828 | default: |
9b857d26 | 829 | pr_err("Bad mount option: \"%s\"\n", p); |
b4c07bce | 830 | return -EINVAL; |
e73a75fa RD |
831 | break; |
832 | } | |
1da177e4 | 833 | } |
a137e1cc AK |
834 | |
835 | /* Do size after hstate is set up */ | |
836 | if (setsize > NO_SIZE) { | |
837 | struct hstate *h = pconfig->hstate; | |
838 | if (setsize == SIZE_PERCENT) { | |
839 | size <<= huge_page_shift(h); | |
840 | size *= h->max_huge_pages; | |
841 | do_div(size, 100); | |
842 | } | |
843 | pconfig->nr_blocks = (size >> huge_page_shift(h)); | |
844 | } | |
845 | ||
1da177e4 | 846 | return 0; |
e73a75fa RD |
847 | |
848 | bad_val: | |
9b857d26 | 849 | pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); |
c12ddba0 | 850 | return -EINVAL; |
1da177e4 LT |
851 | } |
852 | ||
853 | static int | |
854 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
855 | { | |
1da177e4 LT |
856 | int ret; |
857 | struct hugetlbfs_config config; | |
858 | struct hugetlbfs_sb_info *sbinfo; | |
859 | ||
10f19a86 MS |
860 | save_mount_options(sb, data); |
861 | ||
1da177e4 LT |
862 | config.nr_blocks = -1; /* No limit on size by default */ |
863 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
864 | config.uid = current_fsuid(); |
865 | config.gid = current_fsgid(); | |
1da177e4 | 866 | config.mode = 0755; |
a137e1cc | 867 | config.hstate = &default_hstate; |
1da177e4 | 868 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
869 | if (ret) |
870 | return ret; | |
871 | ||
872 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
873 | if (!sbinfo) | |
874 | return -ENOMEM; | |
875 | sb->s_fs_info = sbinfo; | |
a137e1cc | 876 | sbinfo->hstate = config.hstate; |
1da177e4 | 877 | spin_lock_init(&sbinfo->stat_lock); |
1da177e4 LT |
878 | sbinfo->max_inodes = config.nr_inodes; |
879 | sbinfo->free_inodes = config.nr_inodes; | |
90481622 DG |
880 | sbinfo->spool = NULL; |
881 | if (config.nr_blocks != -1) { | |
882 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); | |
883 | if (!sbinfo->spool) | |
884 | goto out_free; | |
885 | } | |
1da177e4 | 886 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
a137e1cc AK |
887 | sb->s_blocksize = huge_page_size(config.hstate); |
888 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
889 | sb->s_magic = HUGETLBFS_MAGIC; |
890 | sb->s_op = &hugetlbfs_ops; | |
891 | sb->s_time_gran = 1; | |
48fde701 AV |
892 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
893 | if (!sb->s_root) | |
1da177e4 | 894 | goto out_free; |
1da177e4 LT |
895 | return 0; |
896 | out_free: | |
6e6870d4 | 897 | kfree(sbinfo->spool); |
1da177e4 LT |
898 | kfree(sbinfo); |
899 | return -ENOMEM; | |
900 | } | |
901 | ||
3c26ff6e AV |
902 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
903 | int flags, const char *dev_name, void *data) | |
1da177e4 | 904 | { |
3c26ff6e | 905 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
1da177e4 LT |
906 | } |
907 | ||
908 | static struct file_system_type hugetlbfs_fs_type = { | |
909 | .name = "hugetlbfs", | |
3c26ff6e | 910 | .mount = hugetlbfs_mount, |
1da177e4 LT |
911 | .kill_sb = kill_litter_super, |
912 | }; | |
7f78e035 | 913 | MODULE_ALIAS_FS("hugetlbfs"); |
1da177e4 | 914 | |
42d7395f | 915 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
1da177e4 | 916 | |
ef1ff6b8 | 917 | static int can_do_hugetlb_shm(void) |
1da177e4 | 918 | { |
a0eb3a05 EB |
919 | kgid_t shm_group; |
920 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); | |
921 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); | |
1da177e4 LT |
922 | } |
923 | ||
42d7395f AK |
924 | static int get_hstate_idx(int page_size_log) |
925 | { | |
af73e4d9 | 926 | struct hstate *h = hstate_sizelog(page_size_log); |
42d7395f | 927 | |
42d7395f AK |
928 | if (!h) |
929 | return -1; | |
930 | return h - hstates; | |
931 | } | |
932 | ||
be1d2cf5 | 933 | static const struct dentry_operations anon_ops = { |
118b2302 | 934 | .d_dname = simple_dname |
0df4d6e5 AV |
935 | }; |
936 | ||
af73e4d9 NH |
937 | /* |
938 | * Note that size should be aligned to proper hugepage size in caller side, | |
939 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. | |
940 | */ | |
941 | struct file *hugetlb_file_setup(const char *name, size_t size, | |
942 | vm_flags_t acctflag, struct user_struct **user, | |
42d7395f | 943 | int creat_flags, int page_size_log) |
1da177e4 | 944 | { |
39b65252 | 945 | struct file *file = ERR_PTR(-ENOMEM); |
1da177e4 | 946 | struct inode *inode; |
2c48b9c4 | 947 | struct path path; |
0df4d6e5 | 948 | struct super_block *sb; |
1da177e4 | 949 | struct qstr quick_string; |
42d7395f AK |
950 | int hstate_idx; |
951 | ||
952 | hstate_idx = get_hstate_idx(page_size_log); | |
953 | if (hstate_idx < 0) | |
954 | return ERR_PTR(-ENODEV); | |
1da177e4 | 955 | |
353d5c30 | 956 | *user = NULL; |
42d7395f | 957 | if (!hugetlbfs_vfsmount[hstate_idx]) |
5bc98594 AM |
958 | return ERR_PTR(-ENOENT); |
959 | ||
ef1ff6b8 | 960 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
353d5c30 HD |
961 | *user = current_user(); |
962 | if (user_shm_lock(size, *user)) { | |
21a3c273 | 963 | task_lock(current); |
9b857d26 | 964 | pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", |
21a3c273 DR |
965 | current->comm, current->pid); |
966 | task_unlock(current); | |
353d5c30 HD |
967 | } else { |
968 | *user = NULL; | |
2584e517 | 969 | return ERR_PTR(-EPERM); |
353d5c30 | 970 | } |
2584e517 | 971 | } |
1da177e4 | 972 | |
0df4d6e5 | 973 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
9d66586f | 974 | quick_string.name = name; |
1da177e4 LT |
975 | quick_string.len = strlen(quick_string.name); |
976 | quick_string.hash = 0; | |
0df4d6e5 | 977 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
2c48b9c4 | 978 | if (!path.dentry) |
1da177e4 LT |
979 | goto out_shm_unlock; |
980 | ||
0df4d6e5 | 981 | d_set_d_op(path.dentry, &anon_ops); |
42d7395f | 982 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
39b65252 | 983 | file = ERR_PTR(-ENOSPC); |
0df4d6e5 | 984 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 985 | if (!inode) |
ce8d2cdf | 986 | goto out_dentry; |
1da177e4 | 987 | |
39b65252 | 988 | file = ERR_PTR(-ENOMEM); |
af73e4d9 NH |
989 | if (hugetlb_reserve_pages(inode, 0, |
990 | size >> huge_page_shift(hstate_inode(inode)), NULL, | |
991 | acctflag)) | |
b45b5bd6 DG |
992 | goto out_inode; |
993 | ||
2c48b9c4 | 994 | d_instantiate(path.dentry, inode); |
1da177e4 | 995 | inode->i_size = size; |
6d6b77f1 | 996 | clear_nlink(inode); |
ce8d2cdf | 997 | |
2c48b9c4 | 998 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
ce8d2cdf | 999 | &hugetlbfs_file_operations); |
39b65252 | 1000 | if (IS_ERR(file)) |
b4d232e6 | 1001 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 1002 | |
1da177e4 LT |
1003 | return file; |
1004 | ||
b45b5bd6 DG |
1005 | out_inode: |
1006 | iput(inode); | |
1da177e4 | 1007 | out_dentry: |
2c48b9c4 | 1008 | path_put(&path); |
1da177e4 | 1009 | out_shm_unlock: |
353d5c30 HD |
1010 | if (*user) { |
1011 | user_shm_unlock(size, *user); | |
1012 | *user = NULL; | |
1013 | } | |
39b65252 | 1014 | return file; |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | static int __init init_hugetlbfs_fs(void) | |
1018 | { | |
42d7395f | 1019 | struct hstate *h; |
1da177e4 | 1020 | int error; |
42d7395f | 1021 | int i; |
1da177e4 | 1022 | |
457c1b27 | 1023 | if (!hugepages_supported()) { |
9b857d26 | 1024 | pr_info("disabling because there are no supported hugepage sizes\n"); |
457c1b27 NA |
1025 | return -ENOTSUPP; |
1026 | } | |
1027 | ||
d1d5e05f | 1028 | error = -ENOMEM; |
1da177e4 LT |
1029 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1030 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 1031 | 0, 0, init_once); |
1da177e4 | 1032 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1033 | goto out2; |
1da177e4 LT |
1034 | |
1035 | error = register_filesystem(&hugetlbfs_fs_type); | |
1036 | if (error) | |
1037 | goto out; | |
1038 | ||
42d7395f AK |
1039 | i = 0; |
1040 | for_each_hstate(h) { | |
1041 | char buf[50]; | |
1042 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); | |
1da177e4 | 1043 | |
42d7395f AK |
1044 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
1045 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, | |
1046 | buf); | |
1da177e4 | 1047 | |
42d7395f | 1048 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
9b857d26 | 1049 | pr_err("Cannot mount internal hugetlbfs for " |
42d7395f AK |
1050 | "page size %uK", ps_kb); |
1051 | error = PTR_ERR(hugetlbfs_vfsmount[i]); | |
1052 | hugetlbfs_vfsmount[i] = NULL; | |
1053 | } | |
1054 | i++; | |
1055 | } | |
1056 | /* Non default hstates are optional */ | |
1057 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) | |
1058 | return 0; | |
1da177e4 LT |
1059 | |
1060 | out: | |
d1d5e05f | 1061 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
e0bf68dd | 1062 | out2: |
1da177e4 LT |
1063 | return error; |
1064 | } | |
1065 | ||
1066 | static void __exit exit_hugetlbfs_fs(void) | |
1067 | { | |
42d7395f AK |
1068 | struct hstate *h; |
1069 | int i; | |
1070 | ||
1071 | ||
8c0a8537 KS |
1072 | /* |
1073 | * Make sure all delayed rcu free inodes are flushed before we | |
1074 | * destroy cache. | |
1075 | */ | |
1076 | rcu_barrier(); | |
1da177e4 | 1077 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
42d7395f AK |
1078 | i = 0; |
1079 | for_each_hstate(h) | |
1080 | kern_unmount(hugetlbfs_vfsmount[i++]); | |
1da177e4 LT |
1081 | unregister_filesystem(&hugetlbfs_fs_type); |
1082 | } | |
1083 | ||
1084 | module_init(init_hugetlbfs_fs) | |
1085 | module_exit(exit_hugetlbfs_fs) | |
1086 | ||
1087 | MODULE_LICENSE("GPL"); |