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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * hugetlbpage-backed filesystem. Based on ramfs. | |
3 | * | |
4 | * William Irwin, 2002 | |
5 | * | |
6 | * Copyright (C) 2002 Linus Torvalds. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/thread_info.h> | |
11 | #include <asm/current.h> | |
12 | #include <linux/sched.h> /* remove ASAP */ | |
13 | #include <linux/fs.h> | |
14 | #include <linux/mount.h> | |
15 | #include <linux/file.h> | |
e73a75fa | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/writeback.h> |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/highmem.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/string.h> | |
16f7e0fe | 22 | #include <linux/capability.h> |
e73a75fa | 23 | #include <linux/ctype.h> |
1da177e4 LT |
24 | #include <linux/backing-dev.h> |
25 | #include <linux/hugetlb.h> | |
26 | #include <linux/pagevec.h> | |
e73a75fa | 27 | #include <linux/parser.h> |
036e0856 | 28 | #include <linux/mman.h> |
1da177e4 LT |
29 | #include <linux/slab.h> |
30 | #include <linux/dnotify.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/security.h> | |
1fd7317d | 33 | #include <linux/magic.h> |
1da177e4 LT |
34 | |
35 | #include <asm/uaccess.h> | |
36 | ||
ee9b6d61 | 37 | static const struct super_operations hugetlbfs_ops; |
f5e54d6e | 38 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 39 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
40 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
41 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 LT |
42 | |
43 | static struct backing_dev_info hugetlbfs_backing_dev_info = { | |
d993831f | 44 | .name = "hugetlbfs", |
1da177e4 | 45 | .ra_pages = 0, /* No readahead */ |
e4ad08fe | 46 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
1da177e4 LT |
47 | }; |
48 | ||
49 | int sysctl_hugetlb_shm_group; | |
50 | ||
e73a75fa RD |
51 | enum { |
52 | Opt_size, Opt_nr_inodes, | |
53 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 54 | Opt_pagesize, |
e73a75fa RD |
55 | Opt_err, |
56 | }; | |
57 | ||
a447c093 | 58 | static const match_table_t tokens = { |
e73a75fa RD |
59 | {Opt_size, "size=%s"}, |
60 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
61 | {Opt_mode, "mode=%o"}, | |
62 | {Opt_uid, "uid=%u"}, | |
63 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 64 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
65 | {Opt_err, NULL}, |
66 | }; | |
67 | ||
2e9b367c AL |
68 | static void huge_pagevec_release(struct pagevec *pvec) |
69 | { | |
70 | int i; | |
71 | ||
72 | for (i = 0; i < pagevec_count(pvec); ++i) | |
73 | put_page(pvec->pages[i]); | |
74 | ||
75 | pagevec_reinit(pvec); | |
76 | } | |
77 | ||
1da177e4 LT |
78 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
79 | { | |
b39424e2 | 80 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
81 | loff_t len, vma_len; |
82 | int ret; | |
a5516438 | 83 | struct hstate *h = hstate_file(file); |
1da177e4 | 84 | |
68589bc3 | 85 | /* |
dec4ad86 DG |
86 | * vma address alignment (but not the pgoff alignment) has |
87 | * already been checked by prepare_hugepage_range. If you add | |
88 | * any error returns here, do so after setting VM_HUGETLB, so | |
89 | * is_vm_hugetlb_page tests below unmap_region go the right | |
90 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
91 | * and ia64). | |
68589bc3 HD |
92 | */ |
93 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; | |
94 | vma->vm_ops = &hugetlb_vm_ops; | |
1da177e4 | 95 | |
a5516438 | 96 | if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
97 | return -EINVAL; |
98 | ||
1da177e4 LT |
99 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
100 | ||
1b1dcc1b | 101 | mutex_lock(&inode->i_mutex); |
1da177e4 | 102 | file_accessed(file); |
1da177e4 LT |
103 | |
104 | ret = -ENOMEM; | |
105 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 106 | |
a1e78772 | 107 | if (hugetlb_reserve_pages(inode, |
a5516438 | 108 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
109 | len >> huge_page_shift(h), vma, |
110 | vma->vm_flags)) | |
a43a8c39 | 111 | goto out; |
b45b5bd6 | 112 | |
4c887265 AL |
113 | ret = 0; |
114 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 115 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
116 | inode->i_size = len; |
117 | out: | |
1b1dcc1b | 118 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
119 | |
120 | return ret; | |
121 | } | |
122 | ||
123 | /* | |
508034a3 | 124 | * Called under down_write(mmap_sem). |
1da177e4 LT |
125 | */ |
126 | ||
d2ba27e8 | 127 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
128 | static unsigned long |
129 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
130 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
131 | { | |
132 | struct mm_struct *mm = current->mm; | |
133 | struct vm_area_struct *vma; | |
134 | unsigned long start_addr; | |
a5516438 | 135 | struct hstate *h = hstate_file(file); |
1da177e4 | 136 | |
a5516438 | 137 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
138 | return -EINVAL; |
139 | if (len > TASK_SIZE) | |
140 | return -ENOMEM; | |
141 | ||
036e0856 | 142 | if (flags & MAP_FIXED) { |
a5516438 | 143 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
144 | return -EINVAL; |
145 | return addr; | |
146 | } | |
147 | ||
1da177e4 | 148 | if (addr) { |
a5516438 | 149 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
150 | vma = find_vma(mm, addr); |
151 | if (TASK_SIZE - len >= addr && | |
152 | (!vma || addr + len <= vma->vm_start)) | |
153 | return addr; | |
154 | } | |
155 | ||
156 | start_addr = mm->free_area_cache; | |
157 | ||
1363c3cd WW |
158 | if (len <= mm->cached_hole_size) |
159 | start_addr = TASK_UNMAPPED_BASE; | |
160 | ||
1da177e4 | 161 | full_search: |
a5516438 | 162 | addr = ALIGN(start_addr, huge_page_size(h)); |
1da177e4 LT |
163 | |
164 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |
165 | /* At this point: (!vma || addr < vma->vm_end). */ | |
166 | if (TASK_SIZE - len < addr) { | |
167 | /* | |
168 | * Start a new search - just in case we missed | |
169 | * some holes. | |
170 | */ | |
171 | if (start_addr != TASK_UNMAPPED_BASE) { | |
172 | start_addr = TASK_UNMAPPED_BASE; | |
173 | goto full_search; | |
174 | } | |
175 | return -ENOMEM; | |
176 | } | |
177 | ||
178 | if (!vma || addr + len <= vma->vm_start) | |
179 | return addr; | |
a5516438 | 180 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
1da177e4 LT |
181 | } |
182 | } | |
183 | #endif | |
184 | ||
e63e1e5a BP |
185 | static int |
186 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
187 | char __user *buf, unsigned long count, | |
188 | unsigned long size) | |
189 | { | |
190 | char *kaddr; | |
191 | unsigned long left, copied = 0; | |
192 | int i, chunksize; | |
193 | ||
194 | if (size > count) | |
195 | size = count; | |
196 | ||
197 | /* Find which 4k chunk and offset with in that chunk */ | |
198 | i = offset >> PAGE_CACHE_SHIFT; | |
199 | offset = offset & ~PAGE_CACHE_MASK; | |
200 | ||
201 | while (size) { | |
202 | chunksize = PAGE_CACHE_SIZE; | |
203 | if (offset) | |
204 | chunksize -= offset; | |
205 | if (chunksize > size) | |
206 | chunksize = size; | |
207 | kaddr = kmap(&page[i]); | |
208 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
209 | kunmap(&page[i]); | |
210 | if (left) { | |
211 | copied += (chunksize - left); | |
212 | break; | |
213 | } | |
214 | offset = 0; | |
215 | size -= chunksize; | |
216 | buf += chunksize; | |
217 | copied += chunksize; | |
218 | i++; | |
219 | } | |
220 | return copied ? copied : -EFAULT; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Support for read() - Find the page attached to f_mapping and copy out the | |
225 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
226 | * since it has PAGE_CACHE_SIZE assumptions. | |
227 | */ | |
228 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
229 | size_t len, loff_t *ppos) | |
230 | { | |
a5516438 | 231 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
232 | struct address_space *mapping = filp->f_mapping; |
233 | struct inode *inode = mapping->host; | |
a5516438 AK |
234 | unsigned long index = *ppos >> huge_page_shift(h); |
235 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
236 | unsigned long end_index; |
237 | loff_t isize; | |
238 | ssize_t retval = 0; | |
239 | ||
240 | mutex_lock(&inode->i_mutex); | |
241 | ||
242 | /* validate length */ | |
243 | if (len == 0) | |
244 | goto out; | |
245 | ||
246 | isize = i_size_read(inode); | |
247 | if (!isize) | |
248 | goto out; | |
249 | ||
a5516438 | 250 | end_index = (isize - 1) >> huge_page_shift(h); |
e63e1e5a BP |
251 | for (;;) { |
252 | struct page *page; | |
a5516438 | 253 | unsigned long nr, ret; |
91bf189c | 254 | int ra; |
e63e1e5a BP |
255 | |
256 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 257 | nr = huge_page_size(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; |
e63e1e5a BP |
262 | if (nr <= offset) { |
263 | goto out; | |
264 | } | |
265 | } | |
266 | nr = nr - offset; | |
267 | ||
268 | /* Find the page */ | |
269 | page = find_get_page(mapping, index); | |
270 | if (unlikely(page == NULL)) { | |
271 | /* | |
272 | * We have a HOLE, zero out the user-buffer for the | |
273 | * length of the hole or request. | |
274 | */ | |
275 | ret = len < nr ? len : nr; | |
276 | if (clear_user(buf, ret)) | |
91bf189c RK |
277 | ra = -EFAULT; |
278 | else | |
279 | ra = 0; | |
e63e1e5a BP |
280 | } else { |
281 | /* | |
282 | * We have the page, copy it to user space buffer. | |
283 | */ | |
91bf189c RK |
284 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
285 | ret = ra; | |
e63e1e5a | 286 | } |
91bf189c | 287 | if (ra < 0) { |
e63e1e5a | 288 | if (retval == 0) |
91bf189c | 289 | retval = ra; |
e63e1e5a BP |
290 | if (page) |
291 | page_cache_release(page); | |
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 BP |
300 | |
301 | if (page) | |
302 | page_cache_release(page); | |
303 | ||
304 | /* short read or no more work */ | |
305 | if ((ret != nr) || (len == 0)) | |
306 | break; | |
307 | } | |
308 | out: | |
a5516438 | 309 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
310 | mutex_unlock(&inode->i_mutex); |
311 | return retval; | |
312 | } | |
313 | ||
800d15a5 NP |
314 | static int hugetlbfs_write_begin(struct file *file, |
315 | struct address_space *mapping, | |
316 | loff_t pos, unsigned len, unsigned flags, | |
317 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
318 | { |
319 | return -EINVAL; | |
320 | } | |
321 | ||
800d15a5 NP |
322 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
323 | loff_t pos, unsigned len, unsigned copied, | |
324 | struct page *page, void *fsdata) | |
1da177e4 | 325 | { |
800d15a5 | 326 | BUG(); |
1da177e4 LT |
327 | return -EINVAL; |
328 | } | |
329 | ||
1da177e4 LT |
330 | static void truncate_huge_page(struct page *page) |
331 | { | |
fba2591b | 332 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 LT |
333 | ClearPageUptodate(page); |
334 | remove_from_page_cache(page); | |
335 | put_page(page); | |
336 | } | |
337 | ||
b45b5bd6 | 338 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 339 | { |
a5516438 | 340 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 341 | struct address_space *mapping = &inode->i_data; |
a5516438 | 342 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
343 | struct pagevec pvec; |
344 | pgoff_t next; | |
a43a8c39 | 345 | int i, freed = 0; |
1da177e4 LT |
346 | |
347 | pagevec_init(&pvec, 0); | |
348 | next = start; | |
349 | while (1) { | |
350 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
351 | if (next == start) | |
352 | break; | |
353 | next = start; | |
354 | continue; | |
355 | } | |
356 | ||
357 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
358 | struct page *page = pvec.pages[i]; | |
359 | ||
360 | lock_page(page); | |
361 | if (page->index > next) | |
362 | next = page->index; | |
363 | ++next; | |
364 | truncate_huge_page(page); | |
365 | unlock_page(page); | |
a43a8c39 | 366 | freed++; |
1da177e4 LT |
367 | } |
368 | huge_pagevec_release(&pvec); | |
369 | } | |
370 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 371 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
372 | } |
373 | ||
2bbbda30 | 374 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 375 | { |
b45b5bd6 | 376 | truncate_hugepages(inode, 0); |
b0683aa6 | 377 | end_writeback(inode); |
149f4211 CH |
378 | } |
379 | ||
1da177e4 | 380 | static inline void |
856fc295 | 381 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
1da177e4 LT |
382 | { |
383 | struct vm_area_struct *vma; | |
384 | struct prio_tree_iter iter; | |
385 | ||
856fc295 | 386 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
387 | unsigned long v_offset; |
388 | ||
1da177e4 | 389 | /* |
856fc295 HD |
390 | * Can the expression below overflow on 32-bit arches? |
391 | * No, because the prio_tree returns us only those vmas | |
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 | ||
502717f4 | 400 | __unmap_hugepage_range(vma, |
04f2cbe3 | 401 | vma->vm_start + v_offset, 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); |
1da177e4 LT |
415 | spin_lock(&mapping->i_mmap_lock); |
416 | if (!prio_tree_empty(&mapping->i_mmap)) | |
417 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); | |
418 | spin_unlock(&mapping->i_mmap_lock); | |
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 | ||
450 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, | |
451 | gid_t gid, int mode, dev_t dev) | |
452 | { | |
453 | struct inode *inode; | |
1da177e4 LT |
454 | |
455 | inode = new_inode(sb); | |
456 | if (inode) { | |
457 | struct hugetlbfs_inode_info *info; | |
458 | inode->i_mode = mode; | |
459 | inode->i_uid = uid; | |
460 | inode->i_gid = gid; | |
1da177e4 LT |
461 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
462 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
463 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a43a8c39 | 464 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
1da177e4 | 465 | info = HUGETLBFS_I(inode); |
6bfde05b EM |
466 | /* |
467 | * The policy is initialized here even if we are creating a | |
468 | * private inode because initialization simply creates an | |
469 | * an empty rb tree and calls spin_lock_init(), later when we | |
470 | * call mpol_free_shared_policy() it will just return because | |
471 | * the rb tree will still be empty. | |
472 | */ | |
71fe804b | 473 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
474 | switch (mode & S_IFMT) { |
475 | default: | |
476 | init_special_inode(inode, mode, dev); | |
477 | break; | |
478 | case S_IFREG: | |
479 | inode->i_op = &hugetlbfs_inode_operations; | |
480 | inode->i_fop = &hugetlbfs_file_operations; | |
481 | break; | |
482 | case S_IFDIR: | |
483 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
484 | inode->i_fop = &simple_dir_operations; | |
485 | ||
486 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 487 | inc_nlink(inode); |
1da177e4 LT |
488 | break; |
489 | case S_IFLNK: | |
490 | inode->i_op = &page_symlink_inode_operations; | |
491 | break; | |
492 | } | |
493 | } | |
494 | return inode; | |
495 | } | |
496 | ||
497 | /* | |
498 | * File creation. Allocate an inode, and we're done.. | |
499 | */ | |
500 | static int hugetlbfs_mknod(struct inode *dir, | |
501 | struct dentry *dentry, int mode, dev_t dev) | |
502 | { | |
503 | struct inode *inode; | |
504 | int error = -ENOSPC; | |
505 | gid_t gid; | |
506 | ||
507 | if (dir->i_mode & S_ISGID) { | |
508 | gid = dir->i_gid; | |
509 | if (S_ISDIR(mode)) | |
510 | mode |= S_ISGID; | |
511 | } else { | |
77c70de1 | 512 | gid = current_fsgid(); |
1da177e4 | 513 | } |
77c70de1 | 514 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev); |
1da177e4 LT |
515 | if (inode) { |
516 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
517 | d_instantiate(dentry, inode); | |
518 | dget(dentry); /* Extra count - pin the dentry in core */ | |
519 | error = 0; | |
520 | } | |
521 | return error; | |
522 | } | |
523 | ||
524 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
525 | { | |
526 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
527 | if (!retval) | |
d8c76e6f | 528 | inc_nlink(dir); |
1da177e4 LT |
529 | return retval; |
530 | } | |
531 | ||
532 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) | |
533 | { | |
534 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
535 | } | |
536 | ||
537 | static int hugetlbfs_symlink(struct inode *dir, | |
538 | struct dentry *dentry, const char *symname) | |
539 | { | |
540 | struct inode *inode; | |
541 | int error = -ENOSPC; | |
542 | gid_t gid; | |
543 | ||
544 | if (dir->i_mode & S_ISGID) | |
545 | gid = dir->i_gid; | |
546 | else | |
77c70de1 | 547 | gid = current_fsgid(); |
1da177e4 | 548 | |
77c70de1 | 549 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), |
1da177e4 LT |
550 | gid, S_IFLNK|S_IRWXUGO, 0); |
551 | if (inode) { | |
552 | int l = strlen(symname)+1; | |
553 | error = page_symlink(inode, symname, l); | |
554 | if (!error) { | |
555 | d_instantiate(dentry, inode); | |
556 | dget(dentry); | |
557 | } else | |
558 | iput(inode); | |
559 | } | |
560 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
561 | ||
562 | return error; | |
563 | } | |
564 | ||
565 | /* | |
6649a386 | 566 | * mark the head page dirty |
1da177e4 LT |
567 | */ |
568 | static int hugetlbfs_set_page_dirty(struct page *page) | |
569 | { | |
d85f3385 | 570 | struct page *head = compound_head(page); |
6649a386 KC |
571 | |
572 | SetPageDirty(head); | |
1da177e4 LT |
573 | return 0; |
574 | } | |
575 | ||
726c3342 | 576 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 577 | { |
726c3342 | 578 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 579 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
580 | |
581 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 582 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
583 | if (sbinfo) { |
584 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
585 | /* If no limits set, just report 0 for max/free/used |
586 | * blocks, like simple_statfs() */ | |
587 | if (sbinfo->max_blocks >= 0) { | |
588 | buf->f_blocks = sbinfo->max_blocks; | |
589 | buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; | |
590 | buf->f_files = sbinfo->max_inodes; | |
591 | buf->f_ffree = sbinfo->free_inodes; | |
592 | } | |
1da177e4 LT |
593 | spin_unlock(&sbinfo->stat_lock); |
594 | } | |
595 | buf->f_namelen = NAME_MAX; | |
596 | return 0; | |
597 | } | |
598 | ||
599 | static void hugetlbfs_put_super(struct super_block *sb) | |
600 | { | |
601 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
602 | ||
603 | if (sbi) { | |
604 | sb->s_fs_info = NULL; | |
605 | kfree(sbi); | |
606 | } | |
607 | } | |
608 | ||
96527980 CH |
609 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
610 | { | |
611 | if (sbinfo->free_inodes >= 0) { | |
612 | spin_lock(&sbinfo->stat_lock); | |
613 | if (unlikely(!sbinfo->free_inodes)) { | |
614 | spin_unlock(&sbinfo->stat_lock); | |
615 | return 0; | |
616 | } | |
617 | sbinfo->free_inodes--; | |
618 | spin_unlock(&sbinfo->stat_lock); | |
619 | } | |
620 | ||
621 | return 1; | |
622 | } | |
623 | ||
624 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
625 | { | |
626 | if (sbinfo->free_inodes >= 0) { | |
627 | spin_lock(&sbinfo->stat_lock); | |
628 | sbinfo->free_inodes++; | |
629 | spin_unlock(&sbinfo->stat_lock); | |
630 | } | |
631 | } | |
632 | ||
633 | ||
e18b890b | 634 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
635 | |
636 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
637 | { | |
96527980 | 638 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
639 | struct hugetlbfs_inode_info *p; |
640 | ||
96527980 CH |
641 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
642 | return NULL; | |
e94b1766 | 643 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
644 | if (unlikely(!p)) { |
645 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 646 | return NULL; |
96527980 | 647 | } |
1da177e4 LT |
648 | return &p->vfs_inode; |
649 | } | |
650 | ||
1da177e4 LT |
651 | static void hugetlbfs_destroy_inode(struct inode *inode) |
652 | { | |
96527980 | 653 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 LT |
654 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
655 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); | |
656 | } | |
657 | ||
f5e54d6e | 658 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
659 | .write_begin = hugetlbfs_write_begin, |
660 | .write_end = hugetlbfs_write_end, | |
1da177e4 LT |
661 | .set_page_dirty = hugetlbfs_set_page_dirty, |
662 | }; | |
663 | ||
96527980 | 664 | |
51cc5068 | 665 | static void init_once(void *foo) |
96527980 CH |
666 | { |
667 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
668 | ||
a35afb83 | 669 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
670 | } |
671 | ||
4b6f5d20 | 672 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 673 | .read = hugetlbfs_read, |
1da177e4 | 674 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 675 | .fsync = noop_fsync, |
1da177e4 | 676 | .get_unmapped_area = hugetlb_get_unmapped_area, |
6038f373 | 677 | .llseek = default_llseek, |
1da177e4 LT |
678 | }; |
679 | ||
92e1d5be | 680 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
681 | .create = hugetlbfs_create, |
682 | .lookup = simple_lookup, | |
683 | .link = simple_link, | |
684 | .unlink = simple_unlink, | |
685 | .symlink = hugetlbfs_symlink, | |
686 | .mkdir = hugetlbfs_mkdir, | |
687 | .rmdir = simple_rmdir, | |
688 | .mknod = hugetlbfs_mknod, | |
689 | .rename = simple_rename, | |
690 | .setattr = hugetlbfs_setattr, | |
691 | }; | |
692 | ||
92e1d5be | 693 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
694 | .setattr = hugetlbfs_setattr, |
695 | }; | |
696 | ||
ee9b6d61 | 697 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
698 | .alloc_inode = hugetlbfs_alloc_inode, |
699 | .destroy_inode = hugetlbfs_destroy_inode, | |
2bbbda30 | 700 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 701 | .statfs = hugetlbfs_statfs, |
1da177e4 | 702 | .put_super = hugetlbfs_put_super, |
10f19a86 | 703 | .show_options = generic_show_options, |
1da177e4 LT |
704 | }; |
705 | ||
706 | static int | |
707 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
708 | { | |
e73a75fa RD |
709 | char *p, *rest; |
710 | substring_t args[MAX_OPT_ARGS]; | |
711 | int option; | |
a137e1cc AK |
712 | unsigned long long size = 0; |
713 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
714 | |
715 | if (!options) | |
716 | return 0; | |
1da177e4 | 717 | |
e73a75fa RD |
718 | while ((p = strsep(&options, ",")) != NULL) { |
719 | int token; | |
b4c07bce LS |
720 | if (!*p) |
721 | continue; | |
e73a75fa RD |
722 | |
723 | token = match_token(p, tokens, args); | |
724 | switch (token) { | |
725 | case Opt_uid: | |
726 | if (match_int(&args[0], &option)) | |
727 | goto bad_val; | |
728 | pconfig->uid = option; | |
729 | break; | |
730 | ||
731 | case Opt_gid: | |
732 | if (match_int(&args[0], &option)) | |
733 | goto bad_val; | |
734 | pconfig->gid = option; | |
735 | break; | |
736 | ||
737 | case Opt_mode: | |
738 | if (match_octal(&args[0], &option)) | |
739 | goto bad_val; | |
75897d60 | 740 | pconfig->mode = option & 01777U; |
e73a75fa RD |
741 | break; |
742 | ||
743 | case Opt_size: { | |
e73a75fa RD |
744 | /* memparse() will accept a K/M/G without a digit */ |
745 | if (!isdigit(*args[0].from)) | |
746 | goto bad_val; | |
747 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
748 | setsize = SIZE_STD; |
749 | if (*rest == '%') | |
750 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
751 | break; |
752 | } | |
1da177e4 | 753 | |
e73a75fa RD |
754 | case Opt_nr_inodes: |
755 | /* memparse() will accept a K/M/G without a digit */ | |
756 | if (!isdigit(*args[0].from)) | |
757 | goto bad_val; | |
758 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
759 | break; | |
760 | ||
a137e1cc AK |
761 | case Opt_pagesize: { |
762 | unsigned long ps; | |
763 | ps = memparse(args[0].from, &rest); | |
764 | pconfig->hstate = size_to_hstate(ps); | |
765 | if (!pconfig->hstate) { | |
766 | printk(KERN_ERR | |
767 | "hugetlbfs: Unsupported page size %lu MB\n", | |
768 | ps >> 20); | |
769 | return -EINVAL; | |
770 | } | |
771 | break; | |
772 | } | |
773 | ||
e73a75fa | 774 | default: |
b4c07bce LS |
775 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
776 | p); | |
777 | return -EINVAL; | |
e73a75fa RD |
778 | break; |
779 | } | |
1da177e4 | 780 | } |
a137e1cc AK |
781 | |
782 | /* Do size after hstate is set up */ | |
783 | if (setsize > NO_SIZE) { | |
784 | struct hstate *h = pconfig->hstate; | |
785 | if (setsize == SIZE_PERCENT) { | |
786 | size <<= huge_page_shift(h); | |
787 | size *= h->max_huge_pages; | |
788 | do_div(size, 100); | |
789 | } | |
790 | pconfig->nr_blocks = (size >> huge_page_shift(h)); | |
791 | } | |
792 | ||
1da177e4 | 793 | return 0; |
e73a75fa RD |
794 | |
795 | bad_val: | |
796 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", | |
797 | args[0].from, p); | |
c12ddba0 | 798 | return -EINVAL; |
1da177e4 LT |
799 | } |
800 | ||
801 | static int | |
802 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
803 | { | |
804 | struct inode * inode; | |
805 | struct dentry * root; | |
806 | int ret; | |
807 | struct hugetlbfs_config config; | |
808 | struct hugetlbfs_sb_info *sbinfo; | |
809 | ||
10f19a86 MS |
810 | save_mount_options(sb, data); |
811 | ||
1da177e4 LT |
812 | config.nr_blocks = -1; /* No limit on size by default */ |
813 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
814 | config.uid = current_fsuid(); |
815 | config.gid = current_fsgid(); | |
1da177e4 | 816 | config.mode = 0755; |
a137e1cc | 817 | config.hstate = &default_hstate; |
1da177e4 | 818 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
819 | if (ret) |
820 | return ret; | |
821 | ||
822 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
823 | if (!sbinfo) | |
824 | return -ENOMEM; | |
825 | sb->s_fs_info = sbinfo; | |
a137e1cc | 826 | sbinfo->hstate = config.hstate; |
1da177e4 LT |
827 | spin_lock_init(&sbinfo->stat_lock); |
828 | sbinfo->max_blocks = config.nr_blocks; | |
829 | sbinfo->free_blocks = config.nr_blocks; | |
830 | sbinfo->max_inodes = config.nr_inodes; | |
831 | sbinfo->free_inodes = config.nr_inodes; | |
832 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
a137e1cc AK |
833 | sb->s_blocksize = huge_page_size(config.hstate); |
834 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
835 | sb->s_magic = HUGETLBFS_MAGIC; |
836 | sb->s_op = &hugetlbfs_ops; | |
837 | sb->s_time_gran = 1; | |
838 | inode = hugetlbfs_get_inode(sb, config.uid, config.gid, | |
839 | S_IFDIR | config.mode, 0); | |
840 | if (!inode) | |
841 | goto out_free; | |
842 | ||
843 | root = d_alloc_root(inode); | |
844 | if (!root) { | |
845 | iput(inode); | |
846 | goto out_free; | |
847 | } | |
848 | sb->s_root = root; | |
849 | return 0; | |
850 | out_free: | |
851 | kfree(sbinfo); | |
852 | return -ENOMEM; | |
853 | } | |
854 | ||
9a119c05 | 855 | int hugetlb_get_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
856 | { |
857 | int ret = 0; | |
858 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
859 | ||
860 | if (sbinfo->free_blocks > -1) { | |
861 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 AL |
862 | if (sbinfo->free_blocks - delta >= 0) |
863 | sbinfo->free_blocks -= delta; | |
1da177e4 LT |
864 | else |
865 | ret = -ENOMEM; | |
866 | spin_unlock(&sbinfo->stat_lock); | |
867 | } | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
9a119c05 | 872 | void hugetlb_put_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
873 | { |
874 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
875 | ||
876 | if (sbinfo->free_blocks > -1) { | |
877 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 | 878 | sbinfo->free_blocks += delta; |
1da177e4 LT |
879 | spin_unlock(&sbinfo->stat_lock); |
880 | } | |
881 | } | |
882 | ||
454e2398 DH |
883 | static int hugetlbfs_get_sb(struct file_system_type *fs_type, |
884 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 885 | { |
454e2398 | 886 | return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); |
1da177e4 LT |
887 | } |
888 | ||
889 | static struct file_system_type hugetlbfs_fs_type = { | |
890 | .name = "hugetlbfs", | |
891 | .get_sb = hugetlbfs_get_sb, | |
892 | .kill_sb = kill_litter_super, | |
893 | }; | |
894 | ||
895 | static struct vfsmount *hugetlbfs_vfsmount; | |
896 | ||
ef1ff6b8 | 897 | static int can_do_hugetlb_shm(void) |
1da177e4 | 898 | { |
ef1ff6b8 | 899 | return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); |
1da177e4 LT |
900 | } |
901 | ||
353d5c30 | 902 | struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag, |
6bfde05b | 903 | struct user_struct **user, int creat_flags) |
1da177e4 LT |
904 | { |
905 | int error = -ENOMEM; | |
906 | struct file *file; | |
907 | struct inode *inode; | |
2c48b9c4 AV |
908 | struct path path; |
909 | struct dentry *root; | |
1da177e4 | 910 | struct qstr quick_string; |
1da177e4 | 911 | |
353d5c30 | 912 | *user = NULL; |
5bc98594 AM |
913 | if (!hugetlbfs_vfsmount) |
914 | return ERR_PTR(-ENOENT); | |
915 | ||
ef1ff6b8 | 916 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
353d5c30 HD |
917 | *user = current_user(); |
918 | if (user_shm_lock(size, *user)) { | |
2584e517 RT |
919 | WARN_ONCE(1, |
920 | "Using mlock ulimits for SHM_HUGETLB deprecated\n"); | |
353d5c30 HD |
921 | } else { |
922 | *user = NULL; | |
2584e517 | 923 | return ERR_PTR(-EPERM); |
353d5c30 | 924 | } |
2584e517 | 925 | } |
1da177e4 | 926 | |
1da177e4 | 927 | root = hugetlbfs_vfsmount->mnt_root; |
9d66586f | 928 | quick_string.name = name; |
1da177e4 LT |
929 | quick_string.len = strlen(quick_string.name); |
930 | quick_string.hash = 0; | |
2c48b9c4 AV |
931 | path.dentry = d_alloc(root, &quick_string); |
932 | if (!path.dentry) | |
1da177e4 LT |
933 | goto out_shm_unlock; |
934 | ||
2c48b9c4 | 935 | path.mnt = mntget(hugetlbfs_vfsmount); |
1da177e4 | 936 | error = -ENOSPC; |
77c70de1 DH |
937 | inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(), |
938 | current_fsgid(), S_IFREG | S_IRWXUGO, 0); | |
1da177e4 | 939 | if (!inode) |
ce8d2cdf | 940 | goto out_dentry; |
1da177e4 | 941 | |
b45b5bd6 | 942 | error = -ENOMEM; |
a5516438 | 943 | if (hugetlb_reserve_pages(inode, 0, |
5a6fe125 MG |
944 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
945 | acctflag)) | |
b45b5bd6 DG |
946 | goto out_inode; |
947 | ||
2c48b9c4 | 948 | d_instantiate(path.dentry, inode); |
1da177e4 LT |
949 | inode->i_size = size; |
950 | inode->i_nlink = 0; | |
ce8d2cdf DH |
951 | |
952 | error = -ENFILE; | |
2c48b9c4 | 953 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
ce8d2cdf DH |
954 | &hugetlbfs_file_operations); |
955 | if (!file) | |
b4d232e6 | 956 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 957 | |
1da177e4 LT |
958 | return file; |
959 | ||
b45b5bd6 DG |
960 | out_inode: |
961 | iput(inode); | |
1da177e4 | 962 | out_dentry: |
2c48b9c4 | 963 | path_put(&path); |
1da177e4 | 964 | out_shm_unlock: |
353d5c30 HD |
965 | if (*user) { |
966 | user_shm_unlock(size, *user); | |
967 | *user = NULL; | |
968 | } | |
1da177e4 LT |
969 | return ERR_PTR(error); |
970 | } | |
971 | ||
972 | static int __init init_hugetlbfs_fs(void) | |
973 | { | |
974 | int error; | |
975 | struct vfsmount *vfsmount; | |
976 | ||
e0bf68dd PZ |
977 | error = bdi_init(&hugetlbfs_backing_dev_info); |
978 | if (error) | |
979 | return error; | |
980 | ||
1da177e4 LT |
981 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
982 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 983 | 0, 0, init_once); |
1da177e4 | 984 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 985 | goto out2; |
1da177e4 LT |
986 | |
987 | error = register_filesystem(&hugetlbfs_fs_type); | |
988 | if (error) | |
989 | goto out; | |
990 | ||
991 | vfsmount = kern_mount(&hugetlbfs_fs_type); | |
992 | ||
993 | if (!IS_ERR(vfsmount)) { | |
994 | hugetlbfs_vfsmount = vfsmount; | |
995 | return 0; | |
996 | } | |
997 | ||
998 | error = PTR_ERR(vfsmount); | |
999 | ||
1000 | out: | |
1001 | if (error) | |
1002 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
e0bf68dd PZ |
1003 | out2: |
1004 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1005 | return error; |
1006 | } | |
1007 | ||
1008 | static void __exit exit_hugetlbfs_fs(void) | |
1009 | { | |
1010 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
1011 | unregister_filesystem(&hugetlbfs_fs_type); | |
e0bf68dd | 1012 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | module_init(init_hugetlbfs_fs) | |
1016 | module_exit(exit_hugetlbfs_fs) | |
1017 | ||
1018 | MODULE_LICENSE("GPL"); |