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> | |
33 | ||
34 | #include <asm/uaccess.h> | |
35 | ||
36 | /* some random number */ | |
37 | #define HUGETLBFS_MAGIC 0x958458f6 | |
38 | ||
ee9b6d61 | 39 | static const struct super_operations hugetlbfs_ops; |
f5e54d6e | 40 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 41 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
42 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
43 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 LT |
44 | |
45 | static struct backing_dev_info hugetlbfs_backing_dev_info = { | |
46 | .ra_pages = 0, /* No readahead */ | |
e4ad08fe | 47 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
1da177e4 LT |
48 | }; |
49 | ||
50 | int sysctl_hugetlb_shm_group; | |
51 | ||
e73a75fa RD |
52 | enum { |
53 | Opt_size, Opt_nr_inodes, | |
54 | Opt_mode, Opt_uid, Opt_gid, | |
a137e1cc | 55 | Opt_pagesize, |
e73a75fa RD |
56 | Opt_err, |
57 | }; | |
58 | ||
a447c093 | 59 | static const match_table_t tokens = { |
e73a75fa RD |
60 | {Opt_size, "size=%s"}, |
61 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
62 | {Opt_mode, "mode=%o"}, | |
63 | {Opt_uid, "uid=%u"}, | |
64 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 65 | {Opt_pagesize, "pagesize=%s"}, |
e73a75fa RD |
66 | {Opt_err, NULL}, |
67 | }; | |
68 | ||
2e9b367c AL |
69 | static void huge_pagevec_release(struct pagevec *pvec) |
70 | { | |
71 | int i; | |
72 | ||
73 | for (i = 0; i < pagevec_count(pvec); ++i) | |
74 | put_page(pvec->pages[i]); | |
75 | ||
76 | pagevec_reinit(pvec); | |
77 | } | |
78 | ||
1da177e4 LT |
79 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
80 | { | |
b39424e2 | 81 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
82 | loff_t len, vma_len; |
83 | int ret; | |
a5516438 | 84 | struct hstate *h = hstate_file(file); |
1da177e4 | 85 | |
68589bc3 | 86 | /* |
dec4ad86 DG |
87 | * vma address alignment (but not the pgoff alignment) has |
88 | * already been checked by prepare_hugepage_range. If you add | |
89 | * any error returns here, do so after setting VM_HUGETLB, so | |
90 | * is_vm_hugetlb_page tests below unmap_region go the right | |
91 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
92 | * and ia64). | |
68589bc3 HD |
93 | */ |
94 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; | |
95 | vma->vm_ops = &hugetlb_vm_ops; | |
1da177e4 | 96 | |
a5516438 | 97 | if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
98 | return -EINVAL; |
99 | ||
1da177e4 LT |
100 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
101 | ||
1b1dcc1b | 102 | mutex_lock(&inode->i_mutex); |
1da177e4 | 103 | file_accessed(file); |
1da177e4 LT |
104 | |
105 | ret = -ENOMEM; | |
106 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); | |
1da177e4 | 107 | |
a1e78772 | 108 | if (hugetlb_reserve_pages(inode, |
a5516438 | 109 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
110 | len >> huge_page_shift(h), vma, |
111 | vma->vm_flags)) | |
a43a8c39 | 112 | goto out; |
b45b5bd6 | 113 | |
4c887265 AL |
114 | ret = 0; |
115 | hugetlb_prefault_arch_hook(vma->vm_mm); | |
b6174df5 | 116 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
1da177e4 LT |
117 | inode->i_size = len; |
118 | out: | |
1b1dcc1b | 119 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
120 | |
121 | return ret; | |
122 | } | |
123 | ||
124 | /* | |
508034a3 | 125 | * Called under down_write(mmap_sem). |
1da177e4 LT |
126 | */ |
127 | ||
d2ba27e8 | 128 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
129 | static unsigned long |
130 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
131 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
132 | { | |
133 | struct mm_struct *mm = current->mm; | |
134 | struct vm_area_struct *vma; | |
135 | unsigned long start_addr; | |
a5516438 | 136 | struct hstate *h = hstate_file(file); |
1da177e4 | 137 | |
a5516438 | 138 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
139 | return -EINVAL; |
140 | if (len > TASK_SIZE) | |
141 | return -ENOMEM; | |
142 | ||
036e0856 | 143 | if (flags & MAP_FIXED) { |
a5516438 | 144 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
145 | return -EINVAL; |
146 | return addr; | |
147 | } | |
148 | ||
1da177e4 | 149 | if (addr) { |
a5516438 | 150 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
151 | vma = find_vma(mm, addr); |
152 | if (TASK_SIZE - len >= addr && | |
153 | (!vma || addr + len <= vma->vm_start)) | |
154 | return addr; | |
155 | } | |
156 | ||
157 | start_addr = mm->free_area_cache; | |
158 | ||
1363c3cd WW |
159 | if (len <= mm->cached_hole_size) |
160 | start_addr = TASK_UNMAPPED_BASE; | |
161 | ||
1da177e4 | 162 | full_search: |
a5516438 | 163 | addr = ALIGN(start_addr, huge_page_size(h)); |
1da177e4 LT |
164 | |
165 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |
166 | /* At this point: (!vma || addr < vma->vm_end). */ | |
167 | if (TASK_SIZE - len < addr) { | |
168 | /* | |
169 | * Start a new search - just in case we missed | |
170 | * some holes. | |
171 | */ | |
172 | if (start_addr != TASK_UNMAPPED_BASE) { | |
173 | start_addr = TASK_UNMAPPED_BASE; | |
174 | goto full_search; | |
175 | } | |
176 | return -ENOMEM; | |
177 | } | |
178 | ||
179 | if (!vma || addr + len <= vma->vm_start) | |
180 | return addr; | |
a5516438 | 181 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
1da177e4 LT |
182 | } |
183 | } | |
184 | #endif | |
185 | ||
e63e1e5a BP |
186 | static int |
187 | hugetlbfs_read_actor(struct page *page, unsigned long offset, | |
188 | char __user *buf, unsigned long count, | |
189 | unsigned long size) | |
190 | { | |
191 | char *kaddr; | |
192 | unsigned long left, copied = 0; | |
193 | int i, chunksize; | |
194 | ||
195 | if (size > count) | |
196 | size = count; | |
197 | ||
198 | /* Find which 4k chunk and offset with in that chunk */ | |
199 | i = offset >> PAGE_CACHE_SHIFT; | |
200 | offset = offset & ~PAGE_CACHE_MASK; | |
201 | ||
202 | while (size) { | |
203 | chunksize = PAGE_CACHE_SIZE; | |
204 | if (offset) | |
205 | chunksize -= offset; | |
206 | if (chunksize > size) | |
207 | chunksize = size; | |
208 | kaddr = kmap(&page[i]); | |
209 | left = __copy_to_user(buf, kaddr + offset, chunksize); | |
210 | kunmap(&page[i]); | |
211 | if (left) { | |
212 | copied += (chunksize - left); | |
213 | break; | |
214 | } | |
215 | offset = 0; | |
216 | size -= chunksize; | |
217 | buf += chunksize; | |
218 | copied += chunksize; | |
219 | i++; | |
220 | } | |
221 | return copied ? copied : -EFAULT; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Support for read() - Find the page attached to f_mapping and copy out the | |
226 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
227 | * since it has PAGE_CACHE_SIZE assumptions. | |
228 | */ | |
229 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, | |
230 | size_t len, loff_t *ppos) | |
231 | { | |
a5516438 | 232 | struct hstate *h = hstate_file(filp); |
e63e1e5a BP |
233 | struct address_space *mapping = filp->f_mapping; |
234 | struct inode *inode = mapping->host; | |
a5516438 AK |
235 | unsigned long index = *ppos >> huge_page_shift(h); |
236 | unsigned long offset = *ppos & ~huge_page_mask(h); | |
e63e1e5a BP |
237 | unsigned long end_index; |
238 | loff_t isize; | |
239 | ssize_t retval = 0; | |
240 | ||
241 | mutex_lock(&inode->i_mutex); | |
242 | ||
243 | /* validate length */ | |
244 | if (len == 0) | |
245 | goto out; | |
246 | ||
247 | isize = i_size_read(inode); | |
248 | if (!isize) | |
249 | goto out; | |
250 | ||
a5516438 | 251 | end_index = (isize - 1) >> huge_page_shift(h); |
e63e1e5a BP |
252 | for (;;) { |
253 | struct page *page; | |
a5516438 | 254 | unsigned long nr, ret; |
91bf189c | 255 | int ra; |
e63e1e5a BP |
256 | |
257 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 258 | nr = huge_page_size(h); |
e63e1e5a BP |
259 | if (index >= end_index) { |
260 | if (index > end_index) | |
261 | goto out; | |
a5516438 | 262 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
e63e1e5a BP |
263 | if (nr <= offset) { |
264 | goto out; | |
265 | } | |
266 | } | |
267 | nr = nr - offset; | |
268 | ||
269 | /* Find the page */ | |
270 | page = find_get_page(mapping, index); | |
271 | if (unlikely(page == NULL)) { | |
272 | /* | |
273 | * We have a HOLE, zero out the user-buffer for the | |
274 | * length of the hole or request. | |
275 | */ | |
276 | ret = len < nr ? len : nr; | |
277 | if (clear_user(buf, ret)) | |
91bf189c RK |
278 | ra = -EFAULT; |
279 | else | |
280 | ra = 0; | |
e63e1e5a BP |
281 | } else { |
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; | |
e63e1e5a | 287 | } |
91bf189c | 288 | if (ra < 0) { |
e63e1e5a | 289 | if (retval == 0) |
91bf189c | 290 | retval = ra; |
e63e1e5a BP |
291 | if (page) |
292 | page_cache_release(page); | |
293 | goto out; | |
294 | } | |
295 | ||
296 | offset += ret; | |
297 | retval += ret; | |
298 | len -= ret; | |
a5516438 AK |
299 | index += offset >> huge_page_shift(h); |
300 | offset &= ~huge_page_mask(h); | |
e63e1e5a BP |
301 | |
302 | if (page) | |
303 | page_cache_release(page); | |
304 | ||
305 | /* short read or no more work */ | |
306 | if ((ret != nr) || (len == 0)) | |
307 | break; | |
308 | } | |
309 | out: | |
a5516438 | 310 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
311 | mutex_unlock(&inode->i_mutex); |
312 | return retval; | |
313 | } | |
314 | ||
800d15a5 NP |
315 | static int hugetlbfs_write_begin(struct file *file, |
316 | struct address_space *mapping, | |
317 | loff_t pos, unsigned len, unsigned flags, | |
318 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
319 | { |
320 | return -EINVAL; | |
321 | } | |
322 | ||
800d15a5 NP |
323 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
324 | loff_t pos, unsigned len, unsigned copied, | |
325 | struct page *page, void *fsdata) | |
1da177e4 | 326 | { |
800d15a5 | 327 | BUG(); |
1da177e4 LT |
328 | return -EINVAL; |
329 | } | |
330 | ||
1da177e4 LT |
331 | static void truncate_huge_page(struct page *page) |
332 | { | |
fba2591b | 333 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
1da177e4 LT |
334 | ClearPageUptodate(page); |
335 | remove_from_page_cache(page); | |
336 | put_page(page); | |
337 | } | |
338 | ||
b45b5bd6 | 339 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
1da177e4 | 340 | { |
a5516438 | 341 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 342 | struct address_space *mapping = &inode->i_data; |
a5516438 | 343 | const pgoff_t start = lstart >> huge_page_shift(h); |
1da177e4 LT |
344 | struct pagevec pvec; |
345 | pgoff_t next; | |
a43a8c39 | 346 | int i, freed = 0; |
1da177e4 LT |
347 | |
348 | pagevec_init(&pvec, 0); | |
349 | next = start; | |
350 | while (1) { | |
351 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { | |
352 | if (next == start) | |
353 | break; | |
354 | next = start; | |
355 | continue; | |
356 | } | |
357 | ||
358 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
359 | struct page *page = pvec.pages[i]; | |
360 | ||
361 | lock_page(page); | |
362 | if (page->index > next) | |
363 | next = page->index; | |
364 | ++next; | |
365 | truncate_huge_page(page); | |
366 | unlock_page(page); | |
a43a8c39 | 367 | freed++; |
1da177e4 LT |
368 | } |
369 | huge_pagevec_release(&pvec); | |
370 | } | |
371 | BUG_ON(!lstart && mapping->nrpages); | |
a43a8c39 | 372 | hugetlb_unreserve_pages(inode, start, freed); |
1da177e4 LT |
373 | } |
374 | ||
375 | static void hugetlbfs_delete_inode(struct inode *inode) | |
376 | { | |
b45b5bd6 | 377 | truncate_hugepages(inode, 0); |
149f4211 CH |
378 | clear_inode(inode); |
379 | } | |
380 | ||
ddc0a51d | 381 | static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock) |
1da177e4 | 382 | { |
0b1533f6 CH |
383 | struct super_block *sb = inode->i_sb; |
384 | ||
385 | if (!hlist_unhashed(&inode->i_hash)) { | |
1c0eeaf5 | 386 | if (!(inode->i_state & (I_DIRTY|I_SYNC))) |
0b1533f6 CH |
387 | list_move(&inode->i_list, &inode_unused); |
388 | inodes_stat.nr_unused++; | |
389 | if (!sb || (sb->s_flags & MS_ACTIVE)) { | |
390 | spin_unlock(&inode_lock); | |
391 | return; | |
392 | } | |
393 | inode->i_state |= I_WILL_FREE; | |
1da177e4 | 394 | spin_unlock(&inode_lock); |
0b1533f6 CH |
395 | /* |
396 | * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK | |
397 | * in our backing_dev_info. | |
398 | */ | |
399 | write_inode_now(inode, 1); | |
400 | spin_lock(&inode_lock); | |
401 | inode->i_state &= ~I_WILL_FREE; | |
402 | inodes_stat.nr_unused--; | |
403 | hlist_del_init(&inode->i_hash); | |
1da177e4 | 404 | } |
1da177e4 LT |
405 | list_del_init(&inode->i_list); |
406 | list_del_init(&inode->i_sb_list); | |
407 | inode->i_state |= I_FREEING; | |
408 | inodes_stat.nr_inodes--; | |
409 | spin_unlock(&inode_lock); | |
b45b5bd6 | 410 | truncate_hugepages(inode, 0); |
1da177e4 LT |
411 | clear_inode(inode); |
412 | destroy_inode(inode); | |
413 | } | |
414 | ||
415 | static void hugetlbfs_drop_inode(struct inode *inode) | |
416 | { | |
417 | if (!inode->i_nlink) | |
6b09b9df | 418 | generic_delete_inode(inode); |
1da177e4 LT |
419 | else |
420 | hugetlbfs_forget_inode(inode); | |
421 | } | |
422 | ||
1da177e4 | 423 | static inline void |
856fc295 | 424 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
1da177e4 LT |
425 | { |
426 | struct vm_area_struct *vma; | |
427 | struct prio_tree_iter iter; | |
428 | ||
856fc295 | 429 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
1da177e4 LT |
430 | unsigned long v_offset; |
431 | ||
1da177e4 | 432 | /* |
856fc295 HD |
433 | * Can the expression below overflow on 32-bit arches? |
434 | * No, because the prio_tree returns us only those vmas | |
435 | * which overlap the truncated area starting at pgoff, | |
436 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
1da177e4 | 437 | */ |
856fc295 HD |
438 | if (vma->vm_pgoff < pgoff) |
439 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; | |
440 | else | |
1da177e4 LT |
441 | v_offset = 0; |
442 | ||
502717f4 | 443 | __unmap_hugepage_range(vma, |
04f2cbe3 | 444 | vma->vm_start + v_offset, vma->vm_end, NULL); |
1da177e4 LT |
445 | } |
446 | } | |
447 | ||
1da177e4 LT |
448 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
449 | { | |
856fc295 | 450 | pgoff_t pgoff; |
1da177e4 | 451 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 452 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 453 | |
a5516438 | 454 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 455 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 456 | |
7aa91e10 | 457 | i_size_write(inode, offset); |
1da177e4 LT |
458 | spin_lock(&mapping->i_mmap_lock); |
459 | if (!prio_tree_empty(&mapping->i_mmap)) | |
460 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); | |
461 | spin_unlock(&mapping->i_mmap_lock); | |
b45b5bd6 | 462 | truncate_hugepages(inode, offset); |
1da177e4 LT |
463 | return 0; |
464 | } | |
465 | ||
466 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) | |
467 | { | |
468 | struct inode *inode = dentry->d_inode; | |
a5516438 | 469 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
470 | int error; |
471 | unsigned int ia_valid = attr->ia_valid; | |
472 | ||
473 | BUG_ON(!inode); | |
474 | ||
475 | error = inode_change_ok(inode, attr); | |
476 | if (error) | |
477 | goto out; | |
478 | ||
479 | if (ia_valid & ATTR_SIZE) { | |
480 | error = -EINVAL; | |
a5516438 | 481 | if (!(attr->ia_size & ~huge_page_mask(h))) |
1da177e4 LT |
482 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
483 | if (error) | |
484 | goto out; | |
485 | attr->ia_valid &= ~ATTR_SIZE; | |
486 | } | |
487 | error = inode_setattr(inode, attr); | |
488 | out: | |
489 | return error; | |
490 | } | |
491 | ||
492 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, | |
493 | gid_t gid, int mode, dev_t dev) | |
494 | { | |
495 | struct inode *inode; | |
1da177e4 LT |
496 | |
497 | inode = new_inode(sb); | |
498 | if (inode) { | |
499 | struct hugetlbfs_inode_info *info; | |
500 | inode->i_mode = mode; | |
501 | inode->i_uid = uid; | |
502 | inode->i_gid = gid; | |
1da177e4 LT |
503 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
504 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; | |
505 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
a43a8c39 | 506 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
1da177e4 | 507 | info = HUGETLBFS_I(inode); |
71fe804b | 508 | mpol_shared_policy_init(&info->policy, NULL); |
1da177e4 LT |
509 | switch (mode & S_IFMT) { |
510 | default: | |
511 | init_special_inode(inode, mode, dev); | |
512 | break; | |
513 | case S_IFREG: | |
514 | inode->i_op = &hugetlbfs_inode_operations; | |
515 | inode->i_fop = &hugetlbfs_file_operations; | |
516 | break; | |
517 | case S_IFDIR: | |
518 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
519 | inode->i_fop = &simple_dir_operations; | |
520 | ||
521 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 522 | inc_nlink(inode); |
1da177e4 LT |
523 | break; |
524 | case S_IFLNK: | |
525 | inode->i_op = &page_symlink_inode_operations; | |
526 | break; | |
527 | } | |
528 | } | |
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, | |
536 | struct dentry *dentry, int mode, dev_t dev) | |
537 | { | |
538 | struct inode *inode; | |
539 | int error = -ENOSPC; | |
540 | gid_t gid; | |
541 | ||
542 | if (dir->i_mode & S_ISGID) { | |
543 | gid = dir->i_gid; | |
544 | if (S_ISDIR(mode)) | |
545 | mode |= S_ISGID; | |
546 | } else { | |
77c70de1 | 547 | gid = current_fsgid(); |
1da177e4 | 548 | } |
77c70de1 | 549 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev); |
1da177e4 LT |
550 | if (inode) { |
551 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
552 | d_instantiate(dentry, inode); | |
553 | dget(dentry); /* Extra count - pin the dentry in core */ | |
554 | error = 0; | |
555 | } | |
556 | return error; | |
557 | } | |
558 | ||
559 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
560 | { | |
561 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
562 | if (!retval) | |
d8c76e6f | 563 | inc_nlink(dir); |
1da177e4 LT |
564 | return retval; |
565 | } | |
566 | ||
567 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) | |
568 | { | |
569 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
570 | } | |
571 | ||
572 | static int hugetlbfs_symlink(struct inode *dir, | |
573 | struct dentry *dentry, const char *symname) | |
574 | { | |
575 | struct inode *inode; | |
576 | int error = -ENOSPC; | |
577 | gid_t gid; | |
578 | ||
579 | if (dir->i_mode & S_ISGID) | |
580 | gid = dir->i_gid; | |
581 | else | |
77c70de1 | 582 | gid = current_fsgid(); |
1da177e4 | 583 | |
77c70de1 | 584 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), |
1da177e4 LT |
585 | gid, S_IFLNK|S_IRWXUGO, 0); |
586 | if (inode) { | |
587 | int l = strlen(symname)+1; | |
588 | error = page_symlink(inode, symname, l); | |
589 | if (!error) { | |
590 | d_instantiate(dentry, inode); | |
591 | dget(dentry); | |
592 | } else | |
593 | iput(inode); | |
594 | } | |
595 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
596 | ||
597 | return error; | |
598 | } | |
599 | ||
600 | /* | |
6649a386 | 601 | * mark the head page dirty |
1da177e4 LT |
602 | */ |
603 | static int hugetlbfs_set_page_dirty(struct page *page) | |
604 | { | |
d85f3385 | 605 | struct page *head = compound_head(page); |
6649a386 KC |
606 | |
607 | SetPageDirty(head); | |
1da177e4 LT |
608 | return 0; |
609 | } | |
610 | ||
726c3342 | 611 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 612 | { |
726c3342 | 613 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
a5516438 | 614 | struct hstate *h = hstate_inode(dentry->d_inode); |
1da177e4 LT |
615 | |
616 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 617 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
618 | if (sbinfo) { |
619 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
620 | /* If no limits set, just report 0 for max/free/used |
621 | * blocks, like simple_statfs() */ | |
622 | if (sbinfo->max_blocks >= 0) { | |
623 | buf->f_blocks = sbinfo->max_blocks; | |
624 | buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; | |
625 | buf->f_files = sbinfo->max_inodes; | |
626 | buf->f_ffree = sbinfo->free_inodes; | |
627 | } | |
1da177e4 LT |
628 | spin_unlock(&sbinfo->stat_lock); |
629 | } | |
630 | buf->f_namelen = NAME_MAX; | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static void hugetlbfs_put_super(struct super_block *sb) | |
635 | { | |
636 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
637 | ||
638 | if (sbi) { | |
639 | sb->s_fs_info = NULL; | |
640 | kfree(sbi); | |
641 | } | |
642 | } | |
643 | ||
96527980 CH |
644 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
645 | { | |
646 | if (sbinfo->free_inodes >= 0) { | |
647 | spin_lock(&sbinfo->stat_lock); | |
648 | if (unlikely(!sbinfo->free_inodes)) { | |
649 | spin_unlock(&sbinfo->stat_lock); | |
650 | return 0; | |
651 | } | |
652 | sbinfo->free_inodes--; | |
653 | spin_unlock(&sbinfo->stat_lock); | |
654 | } | |
655 | ||
656 | return 1; | |
657 | } | |
658 | ||
659 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
660 | { | |
661 | if (sbinfo->free_inodes >= 0) { | |
662 | spin_lock(&sbinfo->stat_lock); | |
663 | sbinfo->free_inodes++; | |
664 | spin_unlock(&sbinfo->stat_lock); | |
665 | } | |
666 | } | |
667 | ||
668 | ||
e18b890b | 669 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
670 | |
671 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
672 | { | |
96527980 | 673 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
674 | struct hugetlbfs_inode_info *p; |
675 | ||
96527980 CH |
676 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
677 | return NULL; | |
e94b1766 | 678 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
679 | if (unlikely(!p)) { |
680 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 681 | return NULL; |
96527980 | 682 | } |
1da177e4 LT |
683 | return &p->vfs_inode; |
684 | } | |
685 | ||
1da177e4 LT |
686 | static void hugetlbfs_destroy_inode(struct inode *inode) |
687 | { | |
96527980 | 688 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 LT |
689 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
690 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); | |
691 | } | |
692 | ||
f5e54d6e | 693 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
694 | .write_begin = hugetlbfs_write_begin, |
695 | .write_end = hugetlbfs_write_end, | |
1da177e4 LT |
696 | .set_page_dirty = hugetlbfs_set_page_dirty, |
697 | }; | |
698 | ||
96527980 | 699 | |
51cc5068 | 700 | static void init_once(void *foo) |
96527980 CH |
701 | { |
702 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
703 | ||
a35afb83 | 704 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
705 | } |
706 | ||
4b6f5d20 | 707 | const struct file_operations hugetlbfs_file_operations = { |
e63e1e5a | 708 | .read = hugetlbfs_read, |
1da177e4 LT |
709 | .mmap = hugetlbfs_file_mmap, |
710 | .fsync = simple_sync_file, | |
711 | .get_unmapped_area = hugetlb_get_unmapped_area, | |
712 | }; | |
713 | ||
92e1d5be | 714 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
715 | .create = hugetlbfs_create, |
716 | .lookup = simple_lookup, | |
717 | .link = simple_link, | |
718 | .unlink = simple_unlink, | |
719 | .symlink = hugetlbfs_symlink, | |
720 | .mkdir = hugetlbfs_mkdir, | |
721 | .rmdir = simple_rmdir, | |
722 | .mknod = hugetlbfs_mknod, | |
723 | .rename = simple_rename, | |
724 | .setattr = hugetlbfs_setattr, | |
725 | }; | |
726 | ||
92e1d5be | 727 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
728 | .setattr = hugetlbfs_setattr, |
729 | }; | |
730 | ||
ee9b6d61 | 731 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
732 | .alloc_inode = hugetlbfs_alloc_inode, |
733 | .destroy_inode = hugetlbfs_destroy_inode, | |
734 | .statfs = hugetlbfs_statfs, | |
149f4211 | 735 | .delete_inode = hugetlbfs_delete_inode, |
1da177e4 LT |
736 | .drop_inode = hugetlbfs_drop_inode, |
737 | .put_super = hugetlbfs_put_super, | |
10f19a86 | 738 | .show_options = generic_show_options, |
1da177e4 LT |
739 | }; |
740 | ||
741 | static int | |
742 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
743 | { | |
e73a75fa RD |
744 | char *p, *rest; |
745 | substring_t args[MAX_OPT_ARGS]; | |
746 | int option; | |
a137e1cc AK |
747 | unsigned long long size = 0; |
748 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; | |
1da177e4 LT |
749 | |
750 | if (!options) | |
751 | return 0; | |
1da177e4 | 752 | |
e73a75fa RD |
753 | while ((p = strsep(&options, ",")) != NULL) { |
754 | int token; | |
b4c07bce LS |
755 | if (!*p) |
756 | continue; | |
e73a75fa RD |
757 | |
758 | token = match_token(p, tokens, args); | |
759 | switch (token) { | |
760 | case Opt_uid: | |
761 | if (match_int(&args[0], &option)) | |
762 | goto bad_val; | |
763 | pconfig->uid = option; | |
764 | break; | |
765 | ||
766 | case Opt_gid: | |
767 | if (match_int(&args[0], &option)) | |
768 | goto bad_val; | |
769 | pconfig->gid = option; | |
770 | break; | |
771 | ||
772 | case Opt_mode: | |
773 | if (match_octal(&args[0], &option)) | |
774 | goto bad_val; | |
75897d60 | 775 | pconfig->mode = option & 01777U; |
e73a75fa RD |
776 | break; |
777 | ||
778 | case Opt_size: { | |
e73a75fa RD |
779 | /* memparse() will accept a K/M/G without a digit */ |
780 | if (!isdigit(*args[0].from)) | |
781 | goto bad_val; | |
782 | size = memparse(args[0].from, &rest); | |
a137e1cc AK |
783 | setsize = SIZE_STD; |
784 | if (*rest == '%') | |
785 | setsize = SIZE_PERCENT; | |
e73a75fa RD |
786 | break; |
787 | } | |
1da177e4 | 788 | |
e73a75fa RD |
789 | case Opt_nr_inodes: |
790 | /* memparse() will accept a K/M/G without a digit */ | |
791 | if (!isdigit(*args[0].from)) | |
792 | goto bad_val; | |
793 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
794 | break; | |
795 | ||
a137e1cc AK |
796 | case Opt_pagesize: { |
797 | unsigned long ps; | |
798 | ps = memparse(args[0].from, &rest); | |
799 | pconfig->hstate = size_to_hstate(ps); | |
800 | if (!pconfig->hstate) { | |
801 | printk(KERN_ERR | |
802 | "hugetlbfs: Unsupported page size %lu MB\n", | |
803 | ps >> 20); | |
804 | return -EINVAL; | |
805 | } | |
806 | break; | |
807 | } | |
808 | ||
e73a75fa | 809 | default: |
b4c07bce LS |
810 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
811 | p); | |
812 | return -EINVAL; | |
e73a75fa RD |
813 | break; |
814 | } | |
1da177e4 | 815 | } |
a137e1cc AK |
816 | |
817 | /* Do size after hstate is set up */ | |
818 | if (setsize > NO_SIZE) { | |
819 | struct hstate *h = pconfig->hstate; | |
820 | if (setsize == SIZE_PERCENT) { | |
821 | size <<= huge_page_shift(h); | |
822 | size *= h->max_huge_pages; | |
823 | do_div(size, 100); | |
824 | } | |
825 | pconfig->nr_blocks = (size >> huge_page_shift(h)); | |
826 | } | |
827 | ||
1da177e4 | 828 | return 0; |
e73a75fa RD |
829 | |
830 | bad_val: | |
831 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", | |
832 | args[0].from, p); | |
c12ddba0 | 833 | return -EINVAL; |
1da177e4 LT |
834 | } |
835 | ||
836 | static int | |
837 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
838 | { | |
839 | struct inode * inode; | |
840 | struct dentry * root; | |
841 | int ret; | |
842 | struct hugetlbfs_config config; | |
843 | struct hugetlbfs_sb_info *sbinfo; | |
844 | ||
10f19a86 MS |
845 | save_mount_options(sb, data); |
846 | ||
1da177e4 LT |
847 | config.nr_blocks = -1; /* No limit on size by default */ |
848 | config.nr_inodes = -1; /* No limit on number of inodes by default */ | |
77c70de1 DH |
849 | config.uid = current_fsuid(); |
850 | config.gid = current_fsgid(); | |
1da177e4 | 851 | config.mode = 0755; |
a137e1cc | 852 | config.hstate = &default_hstate; |
1da177e4 | 853 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
854 | if (ret) |
855 | return ret; | |
856 | ||
857 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
858 | if (!sbinfo) | |
859 | return -ENOMEM; | |
860 | sb->s_fs_info = sbinfo; | |
a137e1cc | 861 | sbinfo->hstate = config.hstate; |
1da177e4 LT |
862 | spin_lock_init(&sbinfo->stat_lock); |
863 | sbinfo->max_blocks = config.nr_blocks; | |
864 | sbinfo->free_blocks = config.nr_blocks; | |
865 | sbinfo->max_inodes = config.nr_inodes; | |
866 | sbinfo->free_inodes = config.nr_inodes; | |
867 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
a137e1cc AK |
868 | sb->s_blocksize = huge_page_size(config.hstate); |
869 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
870 | sb->s_magic = HUGETLBFS_MAGIC; |
871 | sb->s_op = &hugetlbfs_ops; | |
872 | sb->s_time_gran = 1; | |
873 | inode = hugetlbfs_get_inode(sb, config.uid, config.gid, | |
874 | S_IFDIR | config.mode, 0); | |
875 | if (!inode) | |
876 | goto out_free; | |
877 | ||
878 | root = d_alloc_root(inode); | |
879 | if (!root) { | |
880 | iput(inode); | |
881 | goto out_free; | |
882 | } | |
883 | sb->s_root = root; | |
884 | return 0; | |
885 | out_free: | |
886 | kfree(sbinfo); | |
887 | return -ENOMEM; | |
888 | } | |
889 | ||
9a119c05 | 890 | int hugetlb_get_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
891 | { |
892 | int ret = 0; | |
893 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
894 | ||
895 | if (sbinfo->free_blocks > -1) { | |
896 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 AL |
897 | if (sbinfo->free_blocks - delta >= 0) |
898 | sbinfo->free_blocks -= delta; | |
1da177e4 LT |
899 | else |
900 | ret = -ENOMEM; | |
901 | spin_unlock(&sbinfo->stat_lock); | |
902 | } | |
903 | ||
904 | return ret; | |
905 | } | |
906 | ||
9a119c05 | 907 | void hugetlb_put_quota(struct address_space *mapping, long delta) |
1da177e4 LT |
908 | { |
909 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); | |
910 | ||
911 | if (sbinfo->free_blocks > -1) { | |
912 | spin_lock(&sbinfo->stat_lock); | |
9a119c05 | 913 | sbinfo->free_blocks += delta; |
1da177e4 LT |
914 | spin_unlock(&sbinfo->stat_lock); |
915 | } | |
916 | } | |
917 | ||
454e2398 DH |
918 | static int hugetlbfs_get_sb(struct file_system_type *fs_type, |
919 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 920 | { |
454e2398 | 921 | return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); |
1da177e4 LT |
922 | } |
923 | ||
924 | static struct file_system_type hugetlbfs_fs_type = { | |
925 | .name = "hugetlbfs", | |
926 | .get_sb = hugetlbfs_get_sb, | |
927 | .kill_sb = kill_litter_super, | |
928 | }; | |
929 | ||
930 | static struct vfsmount *hugetlbfs_vfsmount; | |
931 | ||
1da177e4 LT |
932 | static int can_do_hugetlb_shm(void) |
933 | { | |
8a0bdec1 | 934 | return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); |
1da177e4 LT |
935 | } |
936 | ||
5a6fe125 | 937 | struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag) |
1da177e4 LT |
938 | { |
939 | int error = -ENOMEM; | |
2584e517 | 940 | int unlock_shm = 0; |
1da177e4 LT |
941 | struct file *file; |
942 | struct inode *inode; | |
943 | struct dentry *dentry, *root; | |
944 | struct qstr quick_string; | |
86a264ab | 945 | struct user_struct *user = current_user(); |
1da177e4 | 946 | |
5bc98594 AM |
947 | if (!hugetlbfs_vfsmount) |
948 | return ERR_PTR(-ENOENT); | |
949 | ||
2584e517 RT |
950 | if (!can_do_hugetlb_shm()) { |
951 | if (user_shm_lock(size, user)) { | |
952 | unlock_shm = 1; | |
953 | WARN_ONCE(1, | |
954 | "Using mlock ulimits for SHM_HUGETLB deprecated\n"); | |
955 | } else | |
956 | return ERR_PTR(-EPERM); | |
957 | } | |
1da177e4 | 958 | |
1da177e4 | 959 | root = hugetlbfs_vfsmount->mnt_root; |
9d66586f | 960 | quick_string.name = name; |
1da177e4 LT |
961 | quick_string.len = strlen(quick_string.name); |
962 | quick_string.hash = 0; | |
963 | dentry = d_alloc(root, &quick_string); | |
964 | if (!dentry) | |
965 | goto out_shm_unlock; | |
966 | ||
1da177e4 | 967 | error = -ENOSPC; |
77c70de1 DH |
968 | inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(), |
969 | current_fsgid(), S_IFREG | S_IRWXUGO, 0); | |
1da177e4 | 970 | if (!inode) |
ce8d2cdf | 971 | goto out_dentry; |
1da177e4 | 972 | |
b45b5bd6 | 973 | error = -ENOMEM; |
a5516438 | 974 | if (hugetlb_reserve_pages(inode, 0, |
5a6fe125 MG |
975 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
976 | acctflag)) | |
b45b5bd6 DG |
977 | goto out_inode; |
978 | ||
1da177e4 LT |
979 | d_instantiate(dentry, inode); |
980 | inode->i_size = size; | |
981 | inode->i_nlink = 0; | |
ce8d2cdf DH |
982 | |
983 | error = -ENFILE; | |
984 | file = alloc_file(hugetlbfs_vfsmount, dentry, | |
985 | FMODE_WRITE | FMODE_READ, | |
986 | &hugetlbfs_file_operations); | |
987 | if (!file) | |
b4d232e6 | 988 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 989 | |
1da177e4 LT |
990 | return file; |
991 | ||
b45b5bd6 DG |
992 | out_inode: |
993 | iput(inode); | |
1da177e4 LT |
994 | out_dentry: |
995 | dput(dentry); | |
996 | out_shm_unlock: | |
2584e517 RT |
997 | if (unlock_shm) |
998 | user_shm_unlock(size, user); | |
1da177e4 LT |
999 | return ERR_PTR(error); |
1000 | } | |
1001 | ||
1002 | static int __init init_hugetlbfs_fs(void) | |
1003 | { | |
1004 | int error; | |
1005 | struct vfsmount *vfsmount; | |
1006 | ||
e0bf68dd PZ |
1007 | error = bdi_init(&hugetlbfs_backing_dev_info); |
1008 | if (error) | |
1009 | return error; | |
1010 | ||
1da177e4 LT |
1011 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1012 | sizeof(struct hugetlbfs_inode_info), | |
20c2df83 | 1013 | 0, 0, init_once); |
1da177e4 | 1014 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1015 | goto out2; |
1da177e4 LT |
1016 | |
1017 | error = register_filesystem(&hugetlbfs_fs_type); | |
1018 | if (error) | |
1019 | goto out; | |
1020 | ||
1021 | vfsmount = kern_mount(&hugetlbfs_fs_type); | |
1022 | ||
1023 | if (!IS_ERR(vfsmount)) { | |
1024 | hugetlbfs_vfsmount = vfsmount; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | error = PTR_ERR(vfsmount); | |
1029 | ||
1030 | out: | |
1031 | if (error) | |
1032 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
e0bf68dd PZ |
1033 | out2: |
1034 | bdi_destroy(&hugetlbfs_backing_dev_info); | |
1da177e4 LT |
1035 | return error; |
1036 | } | |
1037 | ||
1038 | static void __exit exit_hugetlbfs_fs(void) | |
1039 | { | |
1040 | kmem_cache_destroy(hugetlbfs_inode_cachep); | |
1041 | unregister_filesystem(&hugetlbfs_fs_type); | |
e0bf68dd | 1042 | bdi_destroy(&hugetlbfs_backing_dev_info); |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | module_init(init_hugetlbfs_fs) | |
1046 | module_exit(exit_hugetlbfs_fs) | |
1047 | ||
1048 | MODULE_LICENSE("GPL"); |