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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 | ||
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 | 65 | static struct backing_dev_info hugetlbfs_backing_dev_info = { |
d993831f | 66 | .name = "hugetlbfs", |
1da177e4 | 67 | .ra_pages = 0, /* No readahead */ |
e4ad08fe | 68 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
1da177e4 LT |
69 | }; |
70 | ||
71 | int sysctl_hugetlb_shm_group; | |
72 | ||
e73a75fa RD |
73 | enum { |
74 | Opt_size, Opt_nr_inodes, | |
75 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 76 | Opt_pagesize, |
e73a75fa RD |
77 | Opt_err, |
78 | }; | |
79 | ||
a447c093 | 80 | static const match_table_t tokens = { |
e73a75fa RD |
81 | {Opt_size, "size=%s"}, |
82 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
83 | {Opt_mode, "mode=%o"}, | |
84 | {Opt_uid, "uid=%u"}, | |
85 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 86 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
87 | {Opt_err, NULL}, |
88 | }; | |
89 | ||
2e9b367c AL |
90 | static void huge_pagevec_release(struct pagevec *pvec) |
91 | { | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < pagevec_count(pvec); ++i) | |
95 | put_page(pvec->pages[i]); | |
96 | ||
97 | pagevec_reinit(pvec); | |
98 | } | |
99 | ||
1da177e4 LT |
100 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
101 | { | |
496ad9aa | 102 | struct inode *inode = file_inode(file); |
1da177e4 LT |
103 | loff_t len, vma_len; |
104 | int ret; | |
a5516438 | 105 | struct hstate *h = hstate_file(file); |
1da177e4 | 106 | |
68589bc3 | 107 | /* |
dec4ad86 DG |
108 | * vma address alignment (but not the pgoff alignment) has |
109 | * already been checked by prepare_hugepage_range. If you add | |
110 | * any error returns here, do so after setting VM_HUGETLB, so | |
111 | * is_vm_hugetlb_page tests below unmap_region go the right | |
112 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
113 | * and ia64). | |
68589bc3 | 114 | */ |
a2fce914 | 115 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
68589bc3 | 116 | vma->vm_ops = &hugetlb_vm_ops; |
1da177e4 | 117 | |
2b37c35e | 118 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
119 | return -EINVAL; |
120 | ||
1da177e4 LT |
121 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
122 | ||
1b1dcc1b | 123 | mutex_lock(&inode->i_mutex); |
1da177e4 | 124 | file_accessed(file); |
1da177e4 LT |
125 | |
126 | ret = -ENOMEM; | |
127 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 128 | |
a1e78772 | 129 | if (hugetlb_reserve_pages(inode, |
a5516438 | 130 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
131 | len >> huge_page_shift(h), vma, |
132 | vma->vm_flags)) | |
a43a8c39 | 133 | goto out; |
b45b5bd6 | 134 | |
4c887265 AL |
135 | ret = 0; |
136 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 137 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
138 | inode->i_size = len; |
139 | out: | |
1b1dcc1b | 140 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
141 | |
142 | return ret; | |
143 | } | |
144 | ||
145 | /* | |
508034a3 | 146 | * Called under down_write(mmap_sem). |
1da177e4 LT |
147 | */ |
148 | ||
d2ba27e8 | 149 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
150 | static unsigned long |
151 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
152 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
153 | { | |
154 | struct mm_struct *mm = current->mm; | |
155 | struct vm_area_struct *vma; | |
a5516438 | 156 | struct hstate *h = hstate_file(file); |
08659355 | 157 | struct vm_unmapped_area_info info; |
1da177e4 | 158 | |
a5516438 | 159 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
160 | return -EINVAL; |
161 | if (len > TASK_SIZE) | |
162 | return -ENOMEM; | |
163 | ||
036e0856 | 164 | if (flags & MAP_FIXED) { |
a5516438 | 165 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
166 | return -EINVAL; |
167 | return addr; | |
168 | } | |
169 | ||
1da177e4 | 170 | if (addr) { |
a5516438 | 171 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
172 | vma = find_vma(mm, addr); |
173 | if (TASK_SIZE - len >= addr && | |
174 | (!vma || addr + len <= vma->vm_start)) | |
175 | return addr; | |
176 | } | |
177 | ||
08659355 ML |
178 | info.flags = 0; |
179 | info.length = len; | |
180 | info.low_limit = TASK_UNMAPPED_BASE; | |
181 | info.high_limit = TASK_SIZE; | |
182 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
183 | info.align_offset = 0; | |
184 | return vm_unmapped_area(&info); | |
1da177e4 LT |
185 | } |
186 | #endif | |
187 | ||
e63e1e5a BP |
188 | static int |
189 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
190 | char __user *buf, unsigned long count, | |
191 | unsigned long size) | |
192 | { | |
193 | char *kaddr; | |
194 | unsigned long left, copied = 0; | |
195 | int i, chunksize; | |
196 | ||
197 | if (size > count) | |
198 | size = count; | |
199 | ||
200 | /* Find which 4k chunk and offset with in that chunk */ | |
201 | i = offset >> PAGE_CACHE_SHIFT; | |
202 | offset = offset & ~PAGE_CACHE_MASK; | |
203 | ||
204 | while (size) { | |
205 | chunksize = PAGE_CACHE_SIZE; | |
206 | if (offset) | |
207 | chunksize -= offset; | |
208 | if (chunksize > size) | |
209 | chunksize = size; | |
210 | kaddr = kmap(&page[i]); | |
211 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
212 | kunmap(&page[i]); | |
213 | if (left) { | |
214 | copied += (chunksize - left); | |
215 | break; | |
216 | } | |
217 | offset = 0; | |
218 | size -= chunksize; | |
219 | buf += chunksize; | |
220 | copied += chunksize; | |
221 | i++; | |
222 | } | |
223 | return copied ? copied : -EFAULT; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Support for read() - Find the page attached to f_mapping and copy out the | |
228 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
229 | * since it has PAGE_CACHE_SIZE assumptions. | |
230 | */ | |
231 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
232 | size_t len, loff_t *ppos) | |
233 | { | |
a5516438 | 234 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
235 | struct address_space *mapping = filp->f_mapping; |
236 | struct inode *inode = mapping->host; | |
a5516438 AK |
237 | unsigned long index = *ppos >> huge_page_shift(h); |
238 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
239 | unsigned long end_index; |
240 | loff_t isize; | |
241 | ssize_t retval = 0; | |
242 | ||
e63e1e5a BP |
243 | /* validate length */ |
244 | if (len == 0) | |
245 | goto out; | |
246 | ||
e63e1e5a BP |
247 | for (;;) { |
248 | struct page *page; | |
a5516438 | 249 | unsigned long nr, ret; |
91bf189c | 250 | int ra; |
e63e1e5a BP |
251 | |
252 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 253 | nr = huge_page_size(h); |
a05b0855 AK |
254 | isize = i_size_read(inode); |
255 | if (!isize) | |
256 | goto out; | |
257 | end_index = (isize - 1) >> huge_page_shift(h); | |
e63e1e5a BP |
258 | if (index >= end_index) { |
259 | if (index > end_index) | |
260 | goto out; | |
a5516438 | 261 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 262 | if (nr <= offset) |
e63e1e5a | 263 | goto out; |
e63e1e5a BP |
264 | } |
265 | nr = nr - offset; | |
266 | ||
267 | /* Find the page */ | |
a05b0855 | 268 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
269 | if (unlikely(page == NULL)) { |
270 | /* | |
271 | * We have a HOLE, zero out the user-buffer for the | |
272 | * length of the hole or request. | |
273 | */ | |
274 | ret = len < nr ? len : nr; | |
275 | if (clear_user(buf, ret)) | |
91bf189c RK |
276 | ra = -EFAULT; |
277 | else | |
278 | ra = 0; | |
e63e1e5a | 279 | } else { |
a05b0855 AK |
280 | unlock_page(page); |
281 | ||
e63e1e5a BP |
282 | /* |
283 | * We have the page, copy it to user space buffer. | |
284 | */ | |
91bf189c RK |
285 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
286 | ret = ra; | |
a05b0855 | 287 | page_cache_release(page); |
e63e1e5a | 288 | } |
91bf189c | 289 | if (ra < 0) { |
e63e1e5a | 290 | if (retval == 0) |
91bf189c | 291 | retval = ra; |
e63e1e5a BP |
292 | goto out; |
293 | } | |
294 | ||
295 | offset += ret; | |
296 | retval += ret; | |
297 | len -= ret; | |
a5516438 AK |
298 | index += offset >> huge_page_shift(h); |
299 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 300 | |
e63e1e5a BP |
301 | /* short read or no more work */ |
302 | if ((ret != nr) || (len == 0)) | |
303 | break; | |
304 | } | |
305 | out: | |
a5516438 | 306 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
307 | return retval; |
308 | } | |
309 | ||
800d15a5 NP |
310 | static int hugetlbfs_write_begin(struct file *file, |
311 | struct address_space *mapping, | |
312 | loff_t pos, unsigned len, unsigned flags, | |
313 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
314 | { |
315 | return -EINVAL; | |
316 | } | |
317 | ||
800d15a5 NP |
318 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
319 | loff_t pos, unsigned len, unsigned copied, | |
320 | struct page *page, void *fsdata) | |
1da177e4 | 321 | { |
800d15a5 | 322 | BUG(); |
1da177e4 LT |
323 | return -EINVAL; |
324 | } | |
325 | ||
1da177e4 LT |
326 | static void truncate_huge_page(struct page *page) |
327 | { | |
fba2591b | 328 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 | 329 | ClearPageUptodate(page); |
bd65cb86 | 330 | delete_from_page_cache(page); |
1da177e4 LT |
331 | } |
332 | ||
b45b5bd6 | 333 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 334 | { |
a5516438 | 335 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 336 | struct address_space *mapping = &inode->i_data; |
a5516438 | 337 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
338 | struct pagevec pvec; |
339 | pgoff_t next; | |
a43a8c39 | 340 | int i, freed = 0; |
1da177e4 LT |
341 | |
342 | pagevec_init(&pvec, 0); | |
343 | next = start; | |
344 | while (1) { | |
345 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
346 | if (next == start) | |
347 | break; | |
348 | next = start; | |
349 | continue; | |
350 | } | |
351 | ||
352 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
353 | struct page *page = pvec.pages[i]; | |
354 | ||
355 | lock_page(page); | |
356 | if (page->index > next) | |
357 | next = page->index; | |
358 | ++next; | |
359 | truncate_huge_page(page); | |
360 | unlock_page(page); | |
a43a8c39 | 361 | freed++; |
1da177e4 LT |
362 | } |
363 | huge_pagevec_release(&pvec); | |
364 | } | |
365 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 366 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
367 | } |
368 | ||
2bbbda30 | 369 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 370 | { |
9119a41e JK |
371 | struct resv_map *resv_map; |
372 | ||
b45b5bd6 | 373 | truncate_hugepages(inode, 0); |
9119a41e JK |
374 | resv_map = (struct resv_map *)inode->i_mapping->private_data; |
375 | /* root inode doesn't have the resv_map, so we should check it */ | |
376 | if (resv_map) | |
377 | resv_map_release(&resv_map->refs); | |
dbd5768f | 378 | clear_inode(inode); |
149f4211 CH |
379 | } |
380 | ||
1da177e4 | 381 | static inline void |
6b2dbba8 | 382 | hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) |
1da177e4 LT |
383 | { |
384 | struct vm_area_struct *vma; | |
1da177e4 | 385 | |
6b2dbba8 | 386 | vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
387 | unsigned long v_offset; |
388 | ||
1da177e4 | 389 | /* |
856fc295 | 390 | * Can the expression below overflow on 32-bit arches? |
6b2dbba8 | 391 | * No, because the interval tree returns us only those vmas |
856fc295 HD |
392 | * which overlap the truncated area starting at pgoff, |
393 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 394 | */ |
856fc295 HD |
395 | if (vma->vm_pgoff < pgoff) |
396 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
397 | else | |
1da177e4 LT |
398 | v_offset = 0; |
399 | ||
24669e58 AK |
400 | unmap_hugepage_range(vma, vma->vm_start + v_offset, |
401 | vma->vm_end, NULL); | |
1da177e4 LT |
402 | } |
403 | } | |
404 | ||
1da177e4 LT |
405 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
406 | { | |
856fc295 | 407 | pgoff_t pgoff; |
1da177e4 | 408 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 409 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 410 | |
a5516438 | 411 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 412 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 413 | |
7aa91e10 | 414 | i_size_write(inode, offset); |
83cde9e8 | 415 | i_mmap_lock_write(mapping); |
6b2dbba8 | 416 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
1da177e4 | 417 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
83cde9e8 | 418 | i_mmap_unlock_write(mapping); |
b45b5bd6 | 419 | truncate_hugepages(inode, offset); |
1da177e4 LT |
420 | return 0; |
421 | } | |
422 | ||
423 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
424 | { | |
425 | struct inode *inode = dentry->d_inode; | |
a5516438 | 426 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
427 | int error; |
428 | unsigned int ia_valid = attr->ia_valid; | |
429 | ||
430 | BUG_ON(!inode); | |
431 | ||
432 | error = inode_change_ok(inode, attr); | |
433 | if (error) | |
1025774c | 434 | return error; |
1da177e4 LT |
435 | |
436 | if (ia_valid & ATTR_SIZE) { | |
437 | error = -EINVAL; | |
1025774c CH |
438 | if (attr->ia_size & ~huge_page_mask(h)) |
439 | return -EINVAL; | |
440 | error = hugetlb_vmtruncate(inode, attr->ia_size); | |
1da177e4 | 441 | if (error) |
1025774c | 442 | return error; |
1da177e4 | 443 | } |
1025774c CH |
444 | |
445 | setattr_copy(inode, attr); | |
446 | mark_inode_dirty(inode); | |
447 | return 0; | |
1da177e4 LT |
448 | } |
449 | ||
7d54fa64 AV |
450 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
451 | struct hugetlbfs_config *config) | |
1da177e4 LT |
452 | { |
453 | struct inode *inode; | |
1da177e4 LT |
454 | |
455 | inode = new_inode(sb); | |
456 | if (inode) { | |
457 | struct hugetlbfs_inode_info *info; | |
85fe4025 | 458 | inode->i_ino = get_next_ino(); |
7d54fa64 AV |
459 | inode->i_mode = S_IFDIR | config->mode; |
460 | inode->i_uid = config->uid; | |
461 | inode->i_gid = config->gid; | |
462 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
463 | info = HUGETLBFS_I(inode); | |
464 | mpol_shared_policy_init(&info->policy, NULL); | |
465 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
466 | inode->i_fop = &simple_dir_operations; | |
467 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
468 | inc_nlink(inode); | |
65ed7601 | 469 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
470 | } |
471 | return inode; | |
472 | } | |
473 | ||
b610ded7 | 474 | /* |
c8c06efa | 475 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
b610ded7 MH |
476 | * be taken from reclaim -- unlike regular filesystems. This needs an |
477 | * annotation because huge_pmd_share() does an allocation under | |
c8c06efa | 478 | * i_mmap_rwsem. |
b610ded7 | 479 | */ |
c8c06efa | 480 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
b610ded7 | 481 | |
7d54fa64 AV |
482 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
483 | struct inode *dir, | |
18df2252 | 484 | umode_t mode, dev_t dev) |
7d54fa64 AV |
485 | { |
486 | struct inode *inode; | |
9119a41e JK |
487 | struct resv_map *resv_map; |
488 | ||
489 | resv_map = resv_map_alloc(); | |
490 | if (!resv_map) | |
491 | return NULL; | |
7d54fa64 AV |
492 | |
493 | inode = new_inode(sb); | |
494 | if (inode) { | |
495 | struct hugetlbfs_inode_info *info; | |
496 | inode->i_ino = get_next_ino(); | |
497 | inode_init_owner(inode, dir, mode); | |
c8c06efa DB |
498 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
499 | &hugetlbfs_i_mmap_rwsem_key); | |
1da177e4 LT |
500 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
501 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
502 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
9119a41e | 503 | inode->i_mapping->private_data = resv_map; |
1da177e4 | 504 | info = HUGETLBFS_I(inode); |
6bfde05b EM |
505 | /* |
506 | * The policy is initialized here even if we are creating a | |
507 | * private inode because initialization simply creates an | |
508 | * an empty rb tree and calls spin_lock_init(), later when we | |
509 | * call mpol_free_shared_policy() it will just return because | |
510 | * the rb tree will still be empty. | |
511 | */ | |
71fe804b | 512 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
513 | switch (mode & S_IFMT) { |
514 | default: | |
515 | init_special_inode(inode, mode, dev); | |
516 | break; | |
517 | case S_IFREG: | |
518 | inode->i_op = &hugetlbfs_inode_operations; | |
519 | inode->i_fop = &hugetlbfs_file_operations; | |
520 | break; | |
521 | case S_IFDIR: | |
522 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
523 | inode->i_fop = &simple_dir_operations; | |
524 | ||
525 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 526 | inc_nlink(inode); |
1da177e4 LT |
527 | break; |
528 | case S_IFLNK: | |
529 | inode->i_op = &page_symlink_inode_operations; | |
530 | break; | |
531 | } | |
e096d0c7 | 532 | lockdep_annotate_inode_mutex_key(inode); |
9119a41e JK |
533 | } else |
534 | kref_put(&resv_map->refs, resv_map_release); | |
535 | ||
1da177e4 LT |
536 | return inode; |
537 | } | |
538 | ||
539 | /* | |
540 | * File creation. Allocate an inode, and we're done.. | |
541 | */ | |
542 | static int hugetlbfs_mknod(struct inode *dir, | |
1a67aafb | 543 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
544 | { |
545 | struct inode *inode; | |
546 | int error = -ENOSPC; | |
7d54fa64 AV |
547 | |
548 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
1da177e4 LT |
549 | if (inode) { |
550 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
551 | d_instantiate(dentry, inode); | |
552 | dget(dentry); /* Extra count - pin the dentry in core */ | |
553 | error = 0; | |
554 | } | |
555 | return error; | |
556 | } | |
557 | ||
18bb1db3 | 558 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
559 | { |
560 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
561 | if (!retval) | |
d8c76e6f | 562 | inc_nlink(dir); |
1da177e4 LT |
563 | return retval; |
564 | } | |
565 | ||
ebfc3b49 | 566 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
567 | { |
568 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
569 | } | |
570 | ||
571 | static int hugetlbfs_symlink(struct inode *dir, | |
572 | struct dentry *dentry, const char *symname) | |
573 | { | |
574 | struct inode *inode; | |
575 | int error = -ENOSPC; | |
1da177e4 | 576 | |
7d54fa64 | 577 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
578 | if (inode) { |
579 | int l = strlen(symname)+1; | |
580 | error = page_symlink(inode, symname, l); | |
581 | if (!error) { | |
582 | d_instantiate(dentry, inode); | |
583 | dget(dentry); | |
584 | } else | |
585 | iput(inode); | |
586 | } | |
587 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
588 | ||
589 | return error; | |
590 | } | |
591 | ||
592 | /* | |
6649a386 | 593 | * mark the head page dirty |
1da177e4 LT |
594 | */ |
595 | static int hugetlbfs_set_page_dirty(struct page *page) | |
596 | { | |
d85f3385 | 597 | struct page *head = compound_head(page); |
6649a386 KC |
598 | |
599 | SetPageDirty(head); | |
1da177e4 LT |
600 | return 0; |
601 | } | |
602 | ||
290408d4 | 603 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
b969c4ab | 604 | struct page *newpage, struct page *page, |
a6bc32b8 | 605 | enum migrate_mode mode) |
290408d4 NH |
606 | { |
607 | int rc; | |
608 | ||
609 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); | |
78bd5209 | 610 | if (rc != MIGRATEPAGE_SUCCESS) |
290408d4 NH |
611 | return rc; |
612 | migrate_page_copy(newpage, page); | |
613 | ||
78bd5209 | 614 | return MIGRATEPAGE_SUCCESS; |
290408d4 NH |
615 | } |
616 | ||
726c3342 | 617 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 618 | { |
726c3342 | 619 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 620 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
621 | |
622 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 623 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
624 | if (sbinfo) { |
625 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
626 | /* If no limits set, just report 0 for max/free/used |
627 | * blocks, like simple_statfs() */ | |
90481622 DG |
628 | if (sbinfo->spool) { |
629 | long free_pages; | |
630 | ||
631 | spin_lock(&sbinfo->spool->lock); | |
632 | buf->f_blocks = sbinfo->spool->max_hpages; | |
633 | free_pages = sbinfo->spool->max_hpages | |
634 | - sbinfo->spool->used_hpages; | |
635 | buf->f_bavail = buf->f_bfree = free_pages; | |
636 | spin_unlock(&sbinfo->spool->lock); | |
74a8a65c DG |
637 | buf->f_files = sbinfo->max_inodes; |
638 | buf->f_ffree = sbinfo->free_inodes; | |
639 | } | |
1da177e4 LT |
640 | spin_unlock(&sbinfo->stat_lock); |
641 | } | |
642 | buf->f_namelen = NAME_MAX; | |
643 | return 0; | |
644 | } | |
645 | ||
646 | static void hugetlbfs_put_super(struct super_block *sb) | |
647 | { | |
648 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
649 | ||
650 | if (sbi) { | |
651 | sb->s_fs_info = NULL; | |
90481622 DG |
652 | |
653 | if (sbi->spool) | |
654 | hugepage_put_subpool(sbi->spool); | |
655 | ||
1da177e4 LT |
656 | kfree(sbi); |
657 | } | |
658 | } | |
659 | ||
96527980 CH |
660 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
661 | { | |
662 | if (sbinfo->free_inodes >= 0) { | |
663 | spin_lock(&sbinfo->stat_lock); | |
664 | if (unlikely(!sbinfo->free_inodes)) { | |
665 | spin_unlock(&sbinfo->stat_lock); | |
666 | return 0; | |
667 | } | |
668 | sbinfo->free_inodes--; | |
669 | spin_unlock(&sbinfo->stat_lock); | |
670 | } | |
671 | ||
672 | return 1; | |
673 | } | |
674 | ||
675 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
676 | { | |
677 | if (sbinfo->free_inodes >= 0) { | |
678 | spin_lock(&sbinfo->stat_lock); | |
679 | sbinfo->free_inodes++; | |
680 | spin_unlock(&sbinfo->stat_lock); | |
681 | } | |
682 | } | |
683 | ||
684 | ||
e18b890b | 685 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
686 | |
687 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
688 | { | |
96527980 | 689 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
690 | struct hugetlbfs_inode_info *p; |
691 | ||
96527980 CH |
692 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
693 | return NULL; | |
e94b1766 | 694 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
695 | if (unlikely(!p)) { |
696 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 697 | return NULL; |
96527980 | 698 | } |
1da177e4 LT |
699 | return &p->vfs_inode; |
700 | } | |
701 | ||
fa0d7e3d NP |
702 | static void hugetlbfs_i_callback(struct rcu_head *head) |
703 | { | |
704 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
705 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
706 | } | |
707 | ||
1da177e4 LT |
708 | static void hugetlbfs_destroy_inode(struct inode *inode) |
709 | { | |
96527980 | 710 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 711 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
fa0d7e3d | 712 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
1da177e4 LT |
713 | } |
714 | ||
f5e54d6e | 715 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
716 | .write_begin = hugetlbfs_write_begin, |
717 | .write_end = hugetlbfs_write_end, | |
1da177e4 | 718 | .set_page_dirty = hugetlbfs_set_page_dirty, |
290408d4 | 719 | .migratepage = hugetlbfs_migrate_page, |
1da177e4 LT |
720 | }; |
721 | ||
96527980 | 722 | |
51cc5068 | 723 | static void init_once(void *foo) |
96527980 CH |
724 | { |
725 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
726 | ||
a35afb83 | 727 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
728 | } |
729 | ||
4b6f5d20 | 730 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 731 | .read = hugetlbfs_read, |
1da177e4 | 732 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 733 | .fsync = noop_fsync, |
1da177e4 | 734 | .get_unmapped_area = hugetlb_get_unmapped_area, |
6038f373 | 735 | .llseek = default_llseek, |
1da177e4 LT |
736 | }; |
737 | ||
92e1d5be | 738 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
739 | .create = hugetlbfs_create, |
740 | .lookup = simple_lookup, | |
741 | .link = simple_link, | |
742 | .unlink = simple_unlink, | |
743 | .symlink = hugetlbfs_symlink, | |
744 | .mkdir = hugetlbfs_mkdir, | |
745 | .rmdir = simple_rmdir, | |
746 | .mknod = hugetlbfs_mknod, | |
747 | .rename = simple_rename, | |
748 | .setattr = hugetlbfs_setattr, | |
749 | }; | |
750 | ||
92e1d5be | 751 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
752 | .setattr = hugetlbfs_setattr, |
753 | }; | |
754 | ||
ee9b6d61 | 755 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
756 | .alloc_inode = hugetlbfs_alloc_inode, |
757 | .destroy_inode = hugetlbfs_destroy_inode, | |
2bbbda30 | 758 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 759 | .statfs = hugetlbfs_statfs, |
1da177e4 | 760 | .put_super = hugetlbfs_put_super, |
10f19a86 | 761 | .show_options = generic_show_options, |
1da177e4 LT |
762 | }; |
763 | ||
764 | static int | |
765 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
766 | { | |
e73a75fa RD |
767 | char *p, *rest; |
768 | substring_t args[MAX_OPT_ARGS]; | |
769 | int option; | |
a137e1cc AK |
770 | unsigned long long size = 0; |
771 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
772 | |
773 | if (!options) | |
774 | return 0; | |
1da177e4 | 775 | |
e73a75fa RD |
776 | while ((p = strsep(&options, ",")) != NULL) { |
777 | int token; | |
b4c07bce LS |
778 | if (!*p) |
779 | continue; | |
e73a75fa RD |
780 | |
781 | token = match_token(p, tokens, args); | |
782 | switch (token) { | |
783 | case Opt_uid: | |
784 | if (match_int(&args[0], &option)) | |
785 | goto bad_val; | |
a0eb3a05 EB |
786 | pconfig->uid = make_kuid(current_user_ns(), option); |
787 | if (!uid_valid(pconfig->uid)) | |
788 | goto bad_val; | |
e73a75fa RD |
789 | break; |
790 | ||
791 | case Opt_gid: | |
792 | if (match_int(&args[0], &option)) | |
793 | goto bad_val; | |
a0eb3a05 EB |
794 | pconfig->gid = make_kgid(current_user_ns(), option); |
795 | if (!gid_valid(pconfig->gid)) | |
796 | goto bad_val; | |
e73a75fa RD |
797 | break; |
798 | ||
799 | case Opt_mode: | |
800 | if (match_octal(&args[0], &option)) | |
801 | goto bad_val; | |
75897d60 | 802 | pconfig->mode = option & 01777U; |
e73a75fa RD |
803 | break; |
804 | ||
805 | case Opt_size: { | |
e73a75fa RD |
806 | /* memparse() will accept a K/M/G without a digit */ |
807 | if (!isdigit(*args[0].from)) | |
808 | goto bad_val; | |
809 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
810 | setsize = SIZE_STD; |
811 | if (*rest == '%') | |
812 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
813 | break; |
814 | } | |
1da177e4 | 815 | |
e73a75fa RD |
816 | case Opt_nr_inodes: |
817 | /* memparse() will accept a K/M/G without a digit */ | |
818 | if (!isdigit(*args[0].from)) | |
819 | goto bad_val; | |
820 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
821 | break; | |
822 | ||
a137e1cc AK |
823 | case Opt_pagesize: { |
824 | unsigned long ps; | |
825 | ps = memparse(args[0].from, &rest); | |
826 | pconfig->hstate = size_to_hstate(ps); | |
827 | if (!pconfig->hstate) { | |
9b857d26 | 828 | pr_err("Unsupported page size %lu MB\n", |
a137e1cc AK |
829 | ps >> 20); |
830 | return -EINVAL; | |
831 | } | |
832 | break; | |
833 | } | |
834 | ||
e73a75fa | 835 | default: |
9b857d26 | 836 | pr_err("Bad mount option: \"%s\"\n", p); |
b4c07bce | 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: | |
9b857d26 | 856 | pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); |
c12ddba0 | 857 | return -EINVAL; |
1da177e4 LT |
858 | } |
859 | ||
860 | static int | |
861 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
862 | { | |
1da177e4 LT |
863 | int ret; |
864 | struct hugetlbfs_config config; | |
865 | struct hugetlbfs_sb_info *sbinfo; | |
866 | ||
10f19a86 MS |
867 | save_mount_options(sb, data); |
868 | ||
1da177e4 LT |
869 | config.nr_blocks = -1; /* No limit on size by default */ |
870 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
871 | config.uid = current_fsuid(); |
872 | config.gid = current_fsgid(); | |
1da177e4 | 873 | config.mode = 0755; |
a137e1cc | 874 | config.hstate = &default_hstate; |
1da177e4 | 875 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
876 | if (ret) |
877 | return ret; | |
878 | ||
879 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
880 | if (!sbinfo) | |
881 | return -ENOMEM; | |
882 | sb->s_fs_info = sbinfo; | |
a137e1cc | 883 | sbinfo->hstate = config.hstate; |
1da177e4 | 884 | spin_lock_init(&sbinfo->stat_lock); |
1da177e4 LT |
885 | sbinfo->max_inodes = config.nr_inodes; |
886 | sbinfo->free_inodes = config.nr_inodes; | |
90481622 DG |
887 | sbinfo->spool = NULL; |
888 | if (config.nr_blocks != -1) { | |
889 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); | |
890 | if (!sbinfo->spool) | |
891 | goto out_free; | |
892 | } | |
1da177e4 | 893 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
a137e1cc AK |
894 | sb->s_blocksize = huge_page_size(config.hstate); |
895 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
896 | sb->s_magic = HUGETLBFS_MAGIC; |
897 | sb->s_op = &hugetlbfs_ops; | |
898 | sb->s_time_gran = 1; | |
48fde701 AV |
899 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
900 | if (!sb->s_root) | |
1da177e4 | 901 | goto out_free; |
1da177e4 LT |
902 | return 0; |
903 | out_free: | |
6e6870d4 | 904 | kfree(sbinfo->spool); |
1da177e4 LT |
905 | kfree(sbinfo); |
906 | return -ENOMEM; | |
907 | } | |
908 | ||
3c26ff6e AV |
909 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
910 | int flags, const char *dev_name, void *data) | |
1da177e4 | 911 | { |
3c26ff6e | 912 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
1da177e4 LT |
913 | } |
914 | ||
915 | static struct file_system_type hugetlbfs_fs_type = { | |
916 | .name = "hugetlbfs", | |
3c26ff6e | 917 | .mount = hugetlbfs_mount, |
1da177e4 LT |
918 | .kill_sb = kill_litter_super, |
919 | }; | |
7f78e035 | 920 | MODULE_ALIAS_FS("hugetlbfs"); |
1da177e4 | 921 | |
42d7395f | 922 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
1da177e4 | 923 | |
ef1ff6b8 | 924 | static int can_do_hugetlb_shm(void) |
1da177e4 | 925 | { |
a0eb3a05 EB |
926 | kgid_t shm_group; |
927 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); | |
928 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); | |
1da177e4 LT |
929 | } |
930 | ||
42d7395f AK |
931 | static int get_hstate_idx(int page_size_log) |
932 | { | |
af73e4d9 | 933 | struct hstate *h = hstate_sizelog(page_size_log); |
42d7395f | 934 | |
42d7395f AK |
935 | if (!h) |
936 | return -1; | |
937 | return h - hstates; | |
938 | } | |
939 | ||
be1d2cf5 | 940 | static const struct dentry_operations anon_ops = { |
118b2302 | 941 | .d_dname = simple_dname |
0df4d6e5 AV |
942 | }; |
943 | ||
af73e4d9 NH |
944 | /* |
945 | * Note that size should be aligned to proper hugepage size in caller side, | |
946 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. | |
947 | */ | |
948 | struct file *hugetlb_file_setup(const char *name, size_t size, | |
949 | vm_flags_t acctflag, struct user_struct **user, | |
42d7395f | 950 | int creat_flags, int page_size_log) |
1da177e4 | 951 | { |
39b65252 | 952 | struct file *file = ERR_PTR(-ENOMEM); |
1da177e4 | 953 | struct inode *inode; |
2c48b9c4 | 954 | struct path path; |
0df4d6e5 | 955 | struct super_block *sb; |
1da177e4 | 956 | struct qstr quick_string; |
42d7395f AK |
957 | int hstate_idx; |
958 | ||
959 | hstate_idx = get_hstate_idx(page_size_log); | |
960 | if (hstate_idx < 0) | |
961 | return ERR_PTR(-ENODEV); | |
1da177e4 | 962 | |
353d5c30 | 963 | *user = NULL; |
42d7395f | 964 | if (!hugetlbfs_vfsmount[hstate_idx]) |
5bc98594 AM |
965 | return ERR_PTR(-ENOENT); |
966 | ||
ef1ff6b8 | 967 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
353d5c30 HD |
968 | *user = current_user(); |
969 | if (user_shm_lock(size, *user)) { | |
21a3c273 | 970 | task_lock(current); |
9b857d26 | 971 | pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", |
21a3c273 DR |
972 | current->comm, current->pid); |
973 | task_unlock(current); | |
353d5c30 HD |
974 | } else { |
975 | *user = NULL; | |
2584e517 | 976 | return ERR_PTR(-EPERM); |
353d5c30 | 977 | } |
2584e517 | 978 | } |
1da177e4 | 979 | |
0df4d6e5 | 980 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
9d66586f | 981 | quick_string.name = name; |
1da177e4 LT |
982 | quick_string.len = strlen(quick_string.name); |
983 | quick_string.hash = 0; | |
0df4d6e5 | 984 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
2c48b9c4 | 985 | if (!path.dentry) |
1da177e4 LT |
986 | goto out_shm_unlock; |
987 | ||
0df4d6e5 | 988 | d_set_d_op(path.dentry, &anon_ops); |
42d7395f | 989 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
39b65252 | 990 | file = ERR_PTR(-ENOSPC); |
0df4d6e5 | 991 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 992 | if (!inode) |
ce8d2cdf | 993 | goto out_dentry; |
1da177e4 | 994 | |
39b65252 | 995 | file = ERR_PTR(-ENOMEM); |
af73e4d9 NH |
996 | if (hugetlb_reserve_pages(inode, 0, |
997 | size >> huge_page_shift(hstate_inode(inode)), NULL, | |
998 | acctflag)) | |
b45b5bd6 DG |
999 | goto out_inode; |
1000 | ||
2c48b9c4 | 1001 | d_instantiate(path.dentry, inode); |
1da177e4 | 1002 | inode->i_size = size; |
6d6b77f1 | 1003 | clear_nlink(inode); |
ce8d2cdf | 1004 | |
2c48b9c4 | 1005 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
ce8d2cdf | 1006 | &hugetlbfs_file_operations); |
39b65252 | 1007 | if (IS_ERR(file)) |
b4d232e6 | 1008 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 1009 | |
1da177e4 LT |
1010 | return file; |
1011 | ||
b45b5bd6 DG |
1012 | out_inode: |
1013 | iput(inode); | |
1da177e4 | 1014 | out_dentry: |
2c48b9c4 | 1015 | path_put(&path); |
1da177e4 | 1016 | out_shm_unlock: |
353d5c30 HD |
1017 | if (*user) { |
1018 | user_shm_unlock(size, *user); | |
1019 | *user = NULL; | |
1020 | } | |
39b65252 | 1021 | return file; |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | static int __init init_hugetlbfs_fs(void) | |
1025 | { | |
42d7395f | 1026 | struct hstate *h; |
1da177e4 | 1027 | int error; |
42d7395f | 1028 | int i; |
1da177e4 | 1029 | |
457c1b27 | 1030 | if (!hugepages_supported()) { |
9b857d26 | 1031 | pr_info("disabling because there are no supported hugepage sizes\n"); |
457c1b27 NA |
1032 | return -ENOTSUPP; |
1033 | } | |
1034 | ||
e0bf68dd PZ |
1035 | error = bdi_init(&hugetlbfs_backing_dev_info); |
1036 | if (error) | |
1037 | return error; | |
1038 | ||
d1d5e05f | 1039 | error = -ENOMEM; |
1da177e4 LT |
1040 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1041 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 1042 | 0, 0, init_once); |
1da177e4 | 1043 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1044 | goto out2; |
1da177e4 LT |
1045 | |
1046 | error = register_filesystem(&hugetlbfs_fs_type); | |
1047 | if (error) | |
1048 | goto out; | |
1049 | ||
42d7395f AK |
1050 | i = 0; |
1051 | for_each_hstate(h) { | |
1052 | char buf[50]; | |
1053 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); | |
1da177e4 | 1054 | |
42d7395f AK |
1055 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
1056 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, | |
1057 | buf); | |
1da177e4 | 1058 | |
42d7395f | 1059 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
9b857d26 | 1060 | pr_err("Cannot mount internal hugetlbfs for " |
42d7395f AK |
1061 | "page size %uK", ps_kb); |
1062 | error = PTR_ERR(hugetlbfs_vfsmount[i]); | |
1063 | hugetlbfs_vfsmount[i] = NULL; | |
1064 | } | |
1065 | i++; | |
1066 | } | |
1067 | /* Non default hstates are optional */ | |
1068 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) | |
1069 | return 0; | |
1da177e4 LT |
1070 | |
1071 | out: | |
d1d5e05f | 1072 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
e0bf68dd PZ |
1073 | out2: |
1074 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1075 | return error; |
1076 | } | |
1077 | ||
1078 | static void __exit exit_hugetlbfs_fs(void) | |
1079 | { | |
42d7395f AK |
1080 | struct hstate *h; |
1081 | int i; | |
1082 | ||
1083 | ||
8c0a8537 KS |
1084 | /* |
1085 | * Make sure all delayed rcu free inodes are flushed before we | |
1086 | * destroy cache. | |
1087 | */ | |
1088 | rcu_barrier(); | |
1da177e4 | 1089 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
42d7395f AK |
1090 | i = 0; |
1091 | for_each_hstate(h) | |
1092 | kern_unmount(hugetlbfs_vfsmount[i++]); | |
1da177e4 | 1093 | unregister_filesystem(&hugetlbfs_fs_type); |
e0bf68dd | 1094 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1095 | } |
1096 | ||
1097 | module_init(init_hugetlbfs_fs) | |
1098 | module_exit(exit_hugetlbfs_fs) | |
1099 | ||
1100 | MODULE_LICENSE("GPL"); |