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. | |
3e89e1c5 | 7 | * License: GPL |
1da177e4 LT |
8 | */ |
9 | ||
9b857d26 AM |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
1da177e4 LT |
12 | #include <linux/thread_info.h> |
13 | #include <asm/current.h> | |
174cd4b1 | 14 | #include <linux/sched/signal.h> /* remove ASAP */ |
70c3547e | 15 | #include <linux/falloc.h> |
1da177e4 LT |
16 | #include <linux/fs.h> |
17 | #include <linux/mount.h> | |
18 | #include <linux/file.h> | |
e73a75fa | 19 | #include <linux/kernel.h> |
1da177e4 LT |
20 | #include <linux/writeback.h> |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/string.h> | |
16f7e0fe | 25 | #include <linux/capability.h> |
e73a75fa | 26 | #include <linux/ctype.h> |
1da177e4 LT |
27 | #include <linux/backing-dev.h> |
28 | #include <linux/hugetlb.h> | |
29 | #include <linux/pagevec.h> | |
e73a75fa | 30 | #include <linux/parser.h> |
036e0856 | 31 | #include <linux/mman.h> |
1da177e4 LT |
32 | #include <linux/slab.h> |
33 | #include <linux/dnotify.h> | |
34 | #include <linux/statfs.h> | |
35 | #include <linux/security.h> | |
1fd7317d | 36 | #include <linux/magic.h> |
290408d4 | 37 | #include <linux/migrate.h> |
34d0640e | 38 | #include <linux/uio.h> |
1da177e4 | 39 | |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
1da177e4 | 41 | |
ee9b6d61 | 42 | static const struct super_operations hugetlbfs_ops; |
f5e54d6e | 43 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 44 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
45 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
46 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 | 47 | |
a1d776ee | 48 | struct hugetlbfs_config { |
4a25220d DH |
49 | struct hstate *hstate; |
50 | long max_hpages; | |
51 | long nr_inodes; | |
52 | long min_hpages; | |
53 | kuid_t uid; | |
54 | kgid_t gid; | |
55 | umode_t mode; | |
a1d776ee DG |
56 | }; |
57 | ||
58 | struct hugetlbfs_inode_info { | |
59 | struct shared_policy policy; | |
60 | struct inode vfs_inode; | |
61 | }; | |
62 | ||
63 | static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) | |
64 | { | |
65 | return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); | |
66 | } | |
67 | ||
1da177e4 LT |
68 | int sysctl_hugetlb_shm_group; |
69 | ||
e73a75fa RD |
70 | enum { |
71 | Opt_size, Opt_nr_inodes, | |
72 | Opt_mode, Opt_uid, Opt_gid, | |
7ca02d0a | 73 | Opt_pagesize, Opt_min_size, |
e73a75fa RD |
74 | Opt_err, |
75 | }; | |
76 | ||
a447c093 | 77 | static const match_table_t tokens = { |
e73a75fa RD |
78 | {Opt_size, "size=%s"}, |
79 | {Opt_nr_inodes, "nr_inodes=%s"}, | |
80 | {Opt_mode, "mode=%o"}, | |
81 | {Opt_uid, "uid=%u"}, | |
82 | {Opt_gid, "gid=%u"}, | |
a137e1cc | 83 | {Opt_pagesize, "pagesize=%s"}, |
7ca02d0a | 84 | {Opt_min_size, "min_size=%s"}, |
e73a75fa RD |
85 | {Opt_err, NULL}, |
86 | }; | |
87 | ||
70c3547e MK |
88 | #ifdef CONFIG_NUMA |
89 | static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, | |
90 | struct inode *inode, pgoff_t index) | |
91 | { | |
92 | vma->vm_policy = mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy, | |
93 | index); | |
94 | } | |
95 | ||
96 | static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) | |
97 | { | |
98 | mpol_cond_put(vma->vm_policy); | |
99 | } | |
100 | #else | |
101 | static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, | |
102 | struct inode *inode, pgoff_t index) | |
103 | { | |
104 | } | |
105 | ||
106 | static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) | |
107 | { | |
108 | } | |
109 | #endif | |
110 | ||
2e9b367c AL |
111 | static void huge_pagevec_release(struct pagevec *pvec) |
112 | { | |
113 | int i; | |
114 | ||
115 | for (i = 0; i < pagevec_count(pvec); ++i) | |
116 | put_page(pvec->pages[i]); | |
117 | ||
118 | pagevec_reinit(pvec); | |
119 | } | |
120 | ||
1da177e4 LT |
121 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
122 | { | |
496ad9aa | 123 | struct inode *inode = file_inode(file); |
1da177e4 LT |
124 | loff_t len, vma_len; |
125 | int ret; | |
a5516438 | 126 | struct hstate *h = hstate_file(file); |
1da177e4 | 127 | |
68589bc3 | 128 | /* |
dec4ad86 DG |
129 | * vma address alignment (but not the pgoff alignment) has |
130 | * already been checked by prepare_hugepage_range. If you add | |
131 | * any error returns here, do so after setting VM_HUGETLB, so | |
132 | * is_vm_hugetlb_page tests below unmap_region go the right | |
133 | * way when do_mmap_pgoff unwinds (may be important on powerpc | |
134 | * and ia64). | |
68589bc3 | 135 | */ |
a2fce914 | 136 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
68589bc3 | 137 | vma->vm_ops = &hugetlb_vm_ops; |
1da177e4 | 138 | |
045c7a3f MK |
139 | /* |
140 | * Offset passed to mmap (before page shift) could have been | |
141 | * negative when represented as a (l)off_t. | |
142 | */ | |
143 | if (((loff_t)vma->vm_pgoff << PAGE_SHIFT) < 0) | |
144 | return -EINVAL; | |
145 | ||
2b37c35e | 146 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
147 | return -EINVAL; |
148 | ||
1da177e4 | 149 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
045c7a3f MK |
150 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
151 | /* check for overflow */ | |
152 | if (len < vma_len) | |
153 | return -EINVAL; | |
1da177e4 | 154 | |
5955102c | 155 | inode_lock(inode); |
1da177e4 | 156 | file_accessed(file); |
1da177e4 LT |
157 | |
158 | ret = -ENOMEM; | |
a1e78772 | 159 | if (hugetlb_reserve_pages(inode, |
a5516438 | 160 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
161 | len >> huge_page_shift(h), vma, |
162 | vma->vm_flags)) | |
a43a8c39 | 163 | goto out; |
b45b5bd6 | 164 | |
4c887265 | 165 | ret = 0; |
b6174df5 | 166 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
045c7a3f | 167 | i_size_write(inode, len); |
1da177e4 | 168 | out: |
5955102c | 169 | inode_unlock(inode); |
1da177e4 LT |
170 | |
171 | return ret; | |
172 | } | |
173 | ||
174 | /* | |
508034a3 | 175 | * Called under down_write(mmap_sem). |
1da177e4 LT |
176 | */ |
177 | ||
d2ba27e8 | 178 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
1da177e4 LT |
179 | static unsigned long |
180 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
181 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
182 | { | |
183 | struct mm_struct *mm = current->mm; | |
184 | struct vm_area_struct *vma; | |
a5516438 | 185 | struct hstate *h = hstate_file(file); |
08659355 | 186 | struct vm_unmapped_area_info info; |
1da177e4 | 187 | |
a5516438 | 188 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
189 | return -EINVAL; |
190 | if (len > TASK_SIZE) | |
191 | return -ENOMEM; | |
192 | ||
036e0856 | 193 | if (flags & MAP_FIXED) { |
a5516438 | 194 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
195 | return -EINVAL; |
196 | return addr; | |
197 | } | |
198 | ||
1da177e4 | 199 | if (addr) { |
a5516438 | 200 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
201 | vma = find_vma(mm, addr); |
202 | if (TASK_SIZE - len >= addr && | |
1be7107f | 203 | (!vma || addr + len <= vm_start_gap(vma))) |
1da177e4 LT |
204 | return addr; |
205 | } | |
206 | ||
08659355 ML |
207 | info.flags = 0; |
208 | info.length = len; | |
209 | info.low_limit = TASK_UNMAPPED_BASE; | |
210 | info.high_limit = TASK_SIZE; | |
211 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
212 | info.align_offset = 0; | |
213 | return vm_unmapped_area(&info); | |
1da177e4 LT |
214 | } |
215 | #endif | |
216 | ||
34d0640e | 217 | static size_t |
e63e1e5a | 218 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
34d0640e | 219 | struct iov_iter *to, unsigned long size) |
e63e1e5a | 220 | { |
34d0640e | 221 | size_t copied = 0; |
e63e1e5a BP |
222 | int i, chunksize; |
223 | ||
e63e1e5a | 224 | /* Find which 4k chunk and offset with in that chunk */ |
09cbfeaf KS |
225 | i = offset >> PAGE_SHIFT; |
226 | offset = offset & ~PAGE_MASK; | |
e63e1e5a BP |
227 | |
228 | while (size) { | |
34d0640e | 229 | size_t n; |
09cbfeaf | 230 | chunksize = PAGE_SIZE; |
e63e1e5a BP |
231 | if (offset) |
232 | chunksize -= offset; | |
233 | if (chunksize > size) | |
234 | chunksize = size; | |
34d0640e AV |
235 | n = copy_page_to_iter(&page[i], offset, chunksize, to); |
236 | copied += n; | |
237 | if (n != chunksize) | |
238 | return copied; | |
e63e1e5a BP |
239 | offset = 0; |
240 | size -= chunksize; | |
e63e1e5a BP |
241 | i++; |
242 | } | |
34d0640e | 243 | return copied; |
e63e1e5a BP |
244 | } |
245 | ||
246 | /* | |
247 | * Support for read() - Find the page attached to f_mapping and copy out the | |
248 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that | |
ea1754a0 | 249 | * since it has PAGE_SIZE assumptions. |
e63e1e5a | 250 | */ |
34d0640e | 251 | static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) |
e63e1e5a | 252 | { |
34d0640e AV |
253 | struct file *file = iocb->ki_filp; |
254 | struct hstate *h = hstate_file(file); | |
255 | struct address_space *mapping = file->f_mapping; | |
e63e1e5a | 256 | struct inode *inode = mapping->host; |
34d0640e AV |
257 | unsigned long index = iocb->ki_pos >> huge_page_shift(h); |
258 | unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); | |
e63e1e5a BP |
259 | unsigned long end_index; |
260 | loff_t isize; | |
261 | ssize_t retval = 0; | |
262 | ||
34d0640e | 263 | while (iov_iter_count(to)) { |
e63e1e5a | 264 | struct page *page; |
34d0640e | 265 | size_t nr, copied; |
e63e1e5a BP |
266 | |
267 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 268 | nr = huge_page_size(h); |
a05b0855 AK |
269 | isize = i_size_read(inode); |
270 | if (!isize) | |
34d0640e | 271 | break; |
a05b0855 | 272 | end_index = (isize - 1) >> huge_page_shift(h); |
34d0640e AV |
273 | if (index > end_index) |
274 | break; | |
275 | if (index == end_index) { | |
a5516438 | 276 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 277 | if (nr <= offset) |
34d0640e | 278 | break; |
e63e1e5a BP |
279 | } |
280 | nr = nr - offset; | |
281 | ||
282 | /* Find the page */ | |
a05b0855 | 283 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
284 | if (unlikely(page == NULL)) { |
285 | /* | |
286 | * We have a HOLE, zero out the user-buffer for the | |
287 | * length of the hole or request. | |
288 | */ | |
34d0640e | 289 | copied = iov_iter_zero(nr, to); |
e63e1e5a | 290 | } else { |
a05b0855 AK |
291 | unlock_page(page); |
292 | ||
e63e1e5a BP |
293 | /* |
294 | * We have the page, copy it to user space buffer. | |
295 | */ | |
34d0640e | 296 | copied = hugetlbfs_read_actor(page, offset, to, nr); |
09cbfeaf | 297 | put_page(page); |
e63e1e5a | 298 | } |
34d0640e AV |
299 | offset += copied; |
300 | retval += copied; | |
301 | if (copied != nr && iov_iter_count(to)) { | |
302 | if (!retval) | |
303 | retval = -EFAULT; | |
304 | break; | |
e63e1e5a | 305 | } |
a5516438 AK |
306 | index += offset >> huge_page_shift(h); |
307 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 308 | } |
34d0640e | 309 | iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
310 | return retval; |
311 | } | |
312 | ||
800d15a5 NP |
313 | static int hugetlbfs_write_begin(struct file *file, |
314 | struct address_space *mapping, | |
315 | loff_t pos, unsigned len, unsigned flags, | |
316 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
317 | { |
318 | return -EINVAL; | |
319 | } | |
320 | ||
800d15a5 NP |
321 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
322 | loff_t pos, unsigned len, unsigned copied, | |
323 | struct page *page, void *fsdata) | |
1da177e4 | 324 | { |
800d15a5 | 325 | BUG(); |
1da177e4 LT |
326 | return -EINVAL; |
327 | } | |
328 | ||
b5cec28d | 329 | static void remove_huge_page(struct page *page) |
1da177e4 | 330 | { |
b9ea2515 | 331 | ClearPageDirty(page); |
1da177e4 | 332 | ClearPageUptodate(page); |
bd65cb86 | 333 | delete_from_page_cache(page); |
1da177e4 LT |
334 | } |
335 | ||
4aae8d1c | 336 | static void |
f808c13f | 337 | hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end) |
4aae8d1c MK |
338 | { |
339 | struct vm_area_struct *vma; | |
340 | ||
341 | /* | |
342 | * end == 0 indicates that the entire range after | |
343 | * start should be unmapped. | |
344 | */ | |
345 | vma_interval_tree_foreach(vma, root, start, end ? end : ULONG_MAX) { | |
346 | unsigned long v_offset; | |
347 | unsigned long v_end; | |
348 | ||
349 | /* | |
350 | * Can the expression below overflow on 32-bit arches? | |
351 | * No, because the interval tree returns us only those vmas | |
352 | * which overlap the truncated area starting at pgoff, | |
353 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
354 | */ | |
355 | if (vma->vm_pgoff < start) | |
356 | v_offset = (start - vma->vm_pgoff) << PAGE_SHIFT; | |
357 | else | |
358 | v_offset = 0; | |
359 | ||
360 | if (!end) | |
361 | v_end = vma->vm_end; | |
362 | else { | |
363 | v_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) | |
364 | + vma->vm_start; | |
365 | if (v_end > vma->vm_end) | |
366 | v_end = vma->vm_end; | |
367 | } | |
368 | ||
369 | unmap_hugepage_range(vma, vma->vm_start + v_offset, v_end, | |
370 | NULL); | |
371 | } | |
372 | } | |
b5cec28d MK |
373 | |
374 | /* | |
375 | * remove_inode_hugepages handles two distinct cases: truncation and hole | |
376 | * punch. There are subtle differences in operation for each case. | |
4aae8d1c | 377 | * |
b5cec28d MK |
378 | * truncation is indicated by end of range being LLONG_MAX |
379 | * In this case, we first scan the range and release found pages. | |
380 | * After releasing pages, hugetlb_unreserve_pages cleans up region/reserv | |
1817889e MK |
381 | * maps and global counts. Page faults can not race with truncation |
382 | * in this routine. hugetlb_no_page() prevents page faults in the | |
383 | * truncated range. It checks i_size before allocation, and again after | |
384 | * with the page table lock for the page held. The same lock must be | |
385 | * acquired to unmap a page. | |
b5cec28d MK |
386 | * hole punch is indicated if end is not LLONG_MAX |
387 | * In the hole punch case we scan the range and release found pages. | |
388 | * Only when releasing a page is the associated region/reserv map | |
389 | * deleted. The region/reserv map for ranges without associated | |
1817889e MK |
390 | * pages are not modified. Page faults can race with hole punch. |
391 | * This is indicated if we find a mapped page. | |
b5cec28d MK |
392 | * Note: If the passed end of range value is beyond the end of file, but |
393 | * not LLONG_MAX this routine still performs a hole punch operation. | |
394 | */ | |
395 | static void remove_inode_hugepages(struct inode *inode, loff_t lstart, | |
396 | loff_t lend) | |
1da177e4 | 397 | { |
a5516438 | 398 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 399 | struct address_space *mapping = &inode->i_data; |
a5516438 | 400 | const pgoff_t start = lstart >> huge_page_shift(h); |
b5cec28d MK |
401 | const pgoff_t end = lend >> huge_page_shift(h); |
402 | struct vm_area_struct pseudo_vma; | |
1da177e4 | 403 | struct pagevec pvec; |
d72dc8a2 | 404 | pgoff_t next, index; |
a43a8c39 | 405 | int i, freed = 0; |
b5cec28d | 406 | bool truncate_op = (lend == LLONG_MAX); |
1da177e4 | 407 | |
b5cec28d MK |
408 | memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); |
409 | pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); | |
86679820 | 410 | pagevec_init(&pvec); |
1da177e4 | 411 | next = start; |
b5cec28d | 412 | while (next < end) { |
b5cec28d | 413 | /* |
1817889e | 414 | * When no more pages are found, we are done. |
b5cec28d | 415 | */ |
397162ff | 416 | if (!pagevec_lookup_range(&pvec, mapping, &next, end - 1)) |
1817889e | 417 | break; |
1da177e4 LT |
418 | |
419 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
420 | struct page *page = pvec.pages[i]; | |
b5cec28d MK |
421 | u32 hash; |
422 | ||
d72dc8a2 | 423 | index = page->index; |
b5cec28d MK |
424 | hash = hugetlb_fault_mutex_hash(h, current->mm, |
425 | &pseudo_vma, | |
d72dc8a2 | 426 | mapping, index, 0); |
b5cec28d | 427 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
1da177e4 | 428 | |
4aae8d1c MK |
429 | /* |
430 | * If page is mapped, it was faulted in after being | |
431 | * unmapped in caller. Unmap (again) now after taking | |
432 | * the fault mutex. The mutex will prevent faults | |
433 | * until we finish removing the page. | |
434 | * | |
435 | * This race can only happen in the hole punch case. | |
436 | * Getting here in a truncate operation is a bug. | |
437 | */ | |
438 | if (unlikely(page_mapped(page))) { | |
1817889e | 439 | BUG_ON(truncate_op); |
4aae8d1c MK |
440 | |
441 | i_mmap_lock_write(mapping); | |
442 | hugetlb_vmdelete_list(&mapping->i_mmap, | |
d72dc8a2 JK |
443 | index * pages_per_huge_page(h), |
444 | (index + 1) * pages_per_huge_page(h)); | |
4aae8d1c MK |
445 | i_mmap_unlock_write(mapping); |
446 | } | |
447 | ||
448 | lock_page(page); | |
449 | /* | |
450 | * We must free the huge page and remove from page | |
451 | * cache (remove_huge_page) BEFORE removing the | |
452 | * region/reserve map (hugetlb_unreserve_pages). In | |
453 | * rare out of memory conditions, removal of the | |
72e2936c | 454 | * region/reserve map could fail. Correspondingly, |
455 | * the subpool and global reserve usage count can need | |
456 | * to be adjusted. | |
4aae8d1c | 457 | */ |
72e2936c | 458 | VM_BUG_ON(PagePrivate(page)); |
4aae8d1c MK |
459 | remove_huge_page(page); |
460 | freed++; | |
461 | if (!truncate_op) { | |
462 | if (unlikely(hugetlb_unreserve_pages(inode, | |
d72dc8a2 | 463 | index, index + 1, 1))) |
72e2936c | 464 | hugetlb_fix_reserve_counts(inode); |
b5cec28d MK |
465 | } |
466 | ||
1da177e4 | 467 | unlock_page(page); |
b5cec28d | 468 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
1da177e4 LT |
469 | } |
470 | huge_pagevec_release(&pvec); | |
1817889e | 471 | cond_resched(); |
1da177e4 | 472 | } |
b5cec28d MK |
473 | |
474 | if (truncate_op) | |
475 | (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); | |
1da177e4 LT |
476 | } |
477 | ||
2bbbda30 | 478 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 479 | { |
9119a41e JK |
480 | struct resv_map *resv_map; |
481 | ||
b5cec28d | 482 | remove_inode_hugepages(inode, 0, LLONG_MAX); |
9119a41e JK |
483 | resv_map = (struct resv_map *)inode->i_mapping->private_data; |
484 | /* root inode doesn't have the resv_map, so we should check it */ | |
485 | if (resv_map) | |
486 | resv_map_release(&resv_map->refs); | |
dbd5768f | 487 | clear_inode(inode); |
149f4211 CH |
488 | } |
489 | ||
1da177e4 LT |
490 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
491 | { | |
856fc295 | 492 | pgoff_t pgoff; |
1da177e4 | 493 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 494 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 495 | |
a5516438 | 496 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 497 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 498 | |
7aa91e10 | 499 | i_size_write(inode, offset); |
83cde9e8 | 500 | i_mmap_lock_write(mapping); |
f808c13f | 501 | if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) |
1bfad99a | 502 | hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0); |
83cde9e8 | 503 | i_mmap_unlock_write(mapping); |
b5cec28d | 504 | remove_inode_hugepages(inode, offset, LLONG_MAX); |
1da177e4 LT |
505 | return 0; |
506 | } | |
507 | ||
70c3547e MK |
508 | static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) |
509 | { | |
510 | struct hstate *h = hstate_inode(inode); | |
511 | loff_t hpage_size = huge_page_size(h); | |
512 | loff_t hole_start, hole_end; | |
513 | ||
514 | /* | |
515 | * For hole punch round up the beginning offset of the hole and | |
516 | * round down the end. | |
517 | */ | |
518 | hole_start = round_up(offset, hpage_size); | |
519 | hole_end = round_down(offset + len, hpage_size); | |
520 | ||
521 | if (hole_end > hole_start) { | |
522 | struct address_space *mapping = inode->i_mapping; | |
523 | ||
5955102c | 524 | inode_lock(inode); |
70c3547e | 525 | i_mmap_lock_write(mapping); |
f808c13f | 526 | if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) |
70c3547e MK |
527 | hugetlb_vmdelete_list(&mapping->i_mmap, |
528 | hole_start >> PAGE_SHIFT, | |
529 | hole_end >> PAGE_SHIFT); | |
530 | i_mmap_unlock_write(mapping); | |
531 | remove_inode_hugepages(inode, hole_start, hole_end); | |
5955102c | 532 | inode_unlock(inode); |
70c3547e MK |
533 | } |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, | |
539 | loff_t len) | |
540 | { | |
541 | struct inode *inode = file_inode(file); | |
542 | struct address_space *mapping = inode->i_mapping; | |
543 | struct hstate *h = hstate_inode(inode); | |
544 | struct vm_area_struct pseudo_vma; | |
545 | struct mm_struct *mm = current->mm; | |
546 | loff_t hpage_size = huge_page_size(h); | |
547 | unsigned long hpage_shift = huge_page_shift(h); | |
548 | pgoff_t start, index, end; | |
549 | int error; | |
550 | u32 hash; | |
551 | ||
552 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
553 | return -EOPNOTSUPP; | |
554 | ||
555 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
556 | return hugetlbfs_punch_hole(inode, offset, len); | |
557 | ||
558 | /* | |
559 | * Default preallocate case. | |
560 | * For this range, start is rounded down and end is rounded up | |
561 | * as well as being converted to page offsets. | |
562 | */ | |
563 | start = offset >> hpage_shift; | |
564 | end = (offset + len + hpage_size - 1) >> hpage_shift; | |
565 | ||
5955102c | 566 | inode_lock(inode); |
70c3547e MK |
567 | |
568 | /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ | |
569 | error = inode_newsize_ok(inode, offset + len); | |
570 | if (error) | |
571 | goto out; | |
572 | ||
573 | /* | |
574 | * Initialize a pseudo vma as this is required by the huge page | |
575 | * allocation routines. If NUMA is configured, use page index | |
576 | * as input to create an allocation policy. | |
577 | */ | |
578 | memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); | |
579 | pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); | |
580 | pseudo_vma.vm_file = file; | |
581 | ||
582 | for (index = start; index < end; index++) { | |
583 | /* | |
584 | * This is supposed to be the vaddr where the page is being | |
585 | * faulted in, but we have no vaddr here. | |
586 | */ | |
587 | struct page *page; | |
588 | unsigned long addr; | |
589 | int avoid_reserve = 0; | |
590 | ||
591 | cond_resched(); | |
592 | ||
593 | /* | |
594 | * fallocate(2) manpage permits EINTR; we may have been | |
595 | * interrupted because we are using up too much memory. | |
596 | */ | |
597 | if (signal_pending(current)) { | |
598 | error = -EINTR; | |
599 | break; | |
600 | } | |
601 | ||
602 | /* Set numa allocation policy based on index */ | |
603 | hugetlb_set_vma_policy(&pseudo_vma, inode, index); | |
604 | ||
605 | /* addr is the offset within the file (zero based) */ | |
606 | addr = index * hpage_size; | |
607 | ||
608 | /* mutex taken here, fault path and hole punch */ | |
609 | hash = hugetlb_fault_mutex_hash(h, mm, &pseudo_vma, mapping, | |
610 | index, addr); | |
611 | mutex_lock(&hugetlb_fault_mutex_table[hash]); | |
612 | ||
613 | /* See if already present in mapping to avoid alloc/free */ | |
614 | page = find_get_page(mapping, index); | |
615 | if (page) { | |
616 | put_page(page); | |
617 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
618 | hugetlb_drop_vma_policy(&pseudo_vma); | |
619 | continue; | |
620 | } | |
621 | ||
622 | /* Allocate page and add to page cache */ | |
623 | page = alloc_huge_page(&pseudo_vma, addr, avoid_reserve); | |
624 | hugetlb_drop_vma_policy(&pseudo_vma); | |
625 | if (IS_ERR(page)) { | |
626 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
627 | error = PTR_ERR(page); | |
628 | goto out; | |
629 | } | |
630 | clear_huge_page(page, addr, pages_per_huge_page(h)); | |
631 | __SetPageUptodate(page); | |
632 | error = huge_add_to_page_cache(page, mapping, index); | |
633 | if (unlikely(error)) { | |
634 | put_page(page); | |
635 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
636 | goto out; | |
637 | } | |
638 | ||
639 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
640 | ||
641 | /* | |
70c3547e | 642 | * unlock_page because locked by add_to_page_cache() |
72639e6d | 643 | * page_put due to reference from alloc_huge_page() |
70c3547e | 644 | */ |
70c3547e | 645 | unlock_page(page); |
72639e6d | 646 | put_page(page); |
70c3547e MK |
647 | } |
648 | ||
649 | if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) | |
650 | i_size_write(inode, offset + len); | |
078cd827 | 651 | inode->i_ctime = current_time(inode); |
70c3547e | 652 | out: |
5955102c | 653 | inode_unlock(inode); |
70c3547e MK |
654 | return error; |
655 | } | |
656 | ||
1da177e4 LT |
657 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) |
658 | { | |
2b0143b5 | 659 | struct inode *inode = d_inode(dentry); |
a5516438 | 660 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
661 | int error; |
662 | unsigned int ia_valid = attr->ia_valid; | |
663 | ||
664 | BUG_ON(!inode); | |
665 | ||
31051c85 | 666 | error = setattr_prepare(dentry, attr); |
1da177e4 | 667 | if (error) |
1025774c | 668 | return error; |
1da177e4 LT |
669 | |
670 | if (ia_valid & ATTR_SIZE) { | |
1025774c CH |
671 | if (attr->ia_size & ~huge_page_mask(h)) |
672 | return -EINVAL; | |
673 | error = hugetlb_vmtruncate(inode, attr->ia_size); | |
1da177e4 | 674 | if (error) |
1025774c | 675 | return error; |
1da177e4 | 676 | } |
1025774c CH |
677 | |
678 | setattr_copy(inode, attr); | |
679 | mark_inode_dirty(inode); | |
680 | return 0; | |
1da177e4 LT |
681 | } |
682 | ||
7d54fa64 AV |
683 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
684 | struct hugetlbfs_config *config) | |
1da177e4 LT |
685 | { |
686 | struct inode *inode; | |
1da177e4 LT |
687 | |
688 | inode = new_inode(sb); | |
689 | if (inode) { | |
85fe4025 | 690 | inode->i_ino = get_next_ino(); |
7d54fa64 AV |
691 | inode->i_mode = S_IFDIR | config->mode; |
692 | inode->i_uid = config->uid; | |
693 | inode->i_gid = config->gid; | |
078cd827 | 694 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
7d54fa64 AV |
695 | inode->i_op = &hugetlbfs_dir_inode_operations; |
696 | inode->i_fop = &simple_dir_operations; | |
697 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
698 | inc_nlink(inode); | |
65ed7601 | 699 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
700 | } |
701 | return inode; | |
702 | } | |
703 | ||
b610ded7 | 704 | /* |
c8c06efa | 705 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
b610ded7 | 706 | * be taken from reclaim -- unlike regular filesystems. This needs an |
88f306b6 | 707 | * annotation because huge_pmd_share() does an allocation under hugetlb's |
c8c06efa | 708 | * i_mmap_rwsem. |
b610ded7 | 709 | */ |
c8c06efa | 710 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
b610ded7 | 711 | |
7d54fa64 AV |
712 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
713 | struct inode *dir, | |
18df2252 | 714 | umode_t mode, dev_t dev) |
7d54fa64 AV |
715 | { |
716 | struct inode *inode; | |
9119a41e JK |
717 | struct resv_map *resv_map; |
718 | ||
719 | resv_map = resv_map_alloc(); | |
720 | if (!resv_map) | |
721 | return NULL; | |
7d54fa64 AV |
722 | |
723 | inode = new_inode(sb); | |
724 | if (inode) { | |
7d54fa64 AV |
725 | inode->i_ino = get_next_ino(); |
726 | inode_init_owner(inode, dir, mode); | |
c8c06efa DB |
727 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
728 | &hugetlbfs_i_mmap_rwsem_key); | |
1da177e4 | 729 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
078cd827 | 730 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
9119a41e | 731 | inode->i_mapping->private_data = resv_map; |
1da177e4 LT |
732 | switch (mode & S_IFMT) { |
733 | default: | |
734 | init_special_inode(inode, mode, dev); | |
735 | break; | |
736 | case S_IFREG: | |
737 | inode->i_op = &hugetlbfs_inode_operations; | |
738 | inode->i_fop = &hugetlbfs_file_operations; | |
739 | break; | |
740 | case S_IFDIR: | |
741 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
742 | inode->i_fop = &simple_dir_operations; | |
743 | ||
744 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 745 | inc_nlink(inode); |
1da177e4 LT |
746 | break; |
747 | case S_IFLNK: | |
748 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 749 | inode_nohighmem(inode); |
1da177e4 LT |
750 | break; |
751 | } | |
e096d0c7 | 752 | lockdep_annotate_inode_mutex_key(inode); |
9119a41e JK |
753 | } else |
754 | kref_put(&resv_map->refs, resv_map_release); | |
755 | ||
1da177e4 LT |
756 | return inode; |
757 | } | |
758 | ||
759 | /* | |
760 | * File creation. Allocate an inode, and we're done.. | |
761 | */ | |
762 | static int hugetlbfs_mknod(struct inode *dir, | |
1a67aafb | 763 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
764 | { |
765 | struct inode *inode; | |
766 | int error = -ENOSPC; | |
7d54fa64 AV |
767 | |
768 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
1da177e4 | 769 | if (inode) { |
078cd827 | 770 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4 LT |
771 | d_instantiate(dentry, inode); |
772 | dget(dentry); /* Extra count - pin the dentry in core */ | |
773 | error = 0; | |
774 | } | |
775 | return error; | |
776 | } | |
777 | ||
18bb1db3 | 778 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
779 | { |
780 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); | |
781 | if (!retval) | |
d8c76e6f | 782 | inc_nlink(dir); |
1da177e4 LT |
783 | return retval; |
784 | } | |
785 | ||
ebfc3b49 | 786 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
787 | { |
788 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); | |
789 | } | |
790 | ||
791 | static int hugetlbfs_symlink(struct inode *dir, | |
792 | struct dentry *dentry, const char *symname) | |
793 | { | |
794 | struct inode *inode; | |
795 | int error = -ENOSPC; | |
1da177e4 | 796 | |
7d54fa64 | 797 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
798 | if (inode) { |
799 | int l = strlen(symname)+1; | |
800 | error = page_symlink(inode, symname, l); | |
801 | if (!error) { | |
802 | d_instantiate(dentry, inode); | |
803 | dget(dentry); | |
804 | } else | |
805 | iput(inode); | |
806 | } | |
078cd827 | 807 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4 LT |
808 | |
809 | return error; | |
810 | } | |
811 | ||
812 | /* | |
6649a386 | 813 | * mark the head page dirty |
1da177e4 LT |
814 | */ |
815 | static int hugetlbfs_set_page_dirty(struct page *page) | |
816 | { | |
d85f3385 | 817 | struct page *head = compound_head(page); |
6649a386 KC |
818 | |
819 | SetPageDirty(head); | |
1da177e4 LT |
820 | return 0; |
821 | } | |
822 | ||
290408d4 | 823 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
b969c4ab | 824 | struct page *newpage, struct page *page, |
a6bc32b8 | 825 | enum migrate_mode mode) |
290408d4 NH |
826 | { |
827 | int rc; | |
828 | ||
829 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); | |
78bd5209 | 830 | if (rc != MIGRATEPAGE_SUCCESS) |
290408d4 | 831 | return rc; |
2916ecc0 JG |
832 | if (mode != MIGRATE_SYNC_NO_COPY) |
833 | migrate_page_copy(newpage, page); | |
834 | else | |
835 | migrate_page_states(newpage, page); | |
290408d4 | 836 | |
78bd5209 | 837 | return MIGRATEPAGE_SUCCESS; |
290408d4 NH |
838 | } |
839 | ||
78bb9203 NH |
840 | static int hugetlbfs_error_remove_page(struct address_space *mapping, |
841 | struct page *page) | |
842 | { | |
843 | struct inode *inode = mapping->host; | |
ab615a5b | 844 | pgoff_t index = page->index; |
78bb9203 NH |
845 | |
846 | remove_huge_page(page); | |
ab615a5b MK |
847 | if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1))) |
848 | hugetlb_fix_reserve_counts(inode); | |
849 | ||
78bb9203 NH |
850 | return 0; |
851 | } | |
852 | ||
4a25220d DH |
853 | /* |
854 | * Display the mount options in /proc/mounts. | |
855 | */ | |
856 | static int hugetlbfs_show_options(struct seq_file *m, struct dentry *root) | |
857 | { | |
858 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(root->d_sb); | |
859 | struct hugepage_subpool *spool = sbinfo->spool; | |
860 | unsigned long hpage_size = huge_page_size(sbinfo->hstate); | |
861 | unsigned hpage_shift = huge_page_shift(sbinfo->hstate); | |
862 | char mod; | |
863 | ||
864 | if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) | |
865 | seq_printf(m, ",uid=%u", | |
866 | from_kuid_munged(&init_user_ns, sbinfo->uid)); | |
867 | if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) | |
868 | seq_printf(m, ",gid=%u", | |
869 | from_kgid_munged(&init_user_ns, sbinfo->gid)); | |
870 | if (sbinfo->mode != 0755) | |
871 | seq_printf(m, ",mode=%o", sbinfo->mode); | |
872 | if (sbinfo->max_inodes != -1) | |
873 | seq_printf(m, ",nr_inodes=%lu", sbinfo->max_inodes); | |
874 | ||
875 | hpage_size /= 1024; | |
876 | mod = 'K'; | |
877 | if (hpage_size >= 1024) { | |
878 | hpage_size /= 1024; | |
879 | mod = 'M'; | |
880 | } | |
881 | seq_printf(m, ",pagesize=%lu%c", hpage_size, mod); | |
882 | if (spool) { | |
883 | if (spool->max_hpages != -1) | |
884 | seq_printf(m, ",size=%llu", | |
885 | (unsigned long long)spool->max_hpages << hpage_shift); | |
886 | if (spool->min_hpages != -1) | |
887 | seq_printf(m, ",min_size=%llu", | |
888 | (unsigned long long)spool->min_hpages << hpage_shift); | |
889 | } | |
890 | return 0; | |
891 | } | |
892 | ||
726c3342 | 893 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 894 | { |
726c3342 | 895 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
2b0143b5 | 896 | struct hstate *h = hstate_inode(d_inode(dentry)); |
1da177e4 LT |
897 | |
898 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 899 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
900 | if (sbinfo) { |
901 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
902 | /* If no limits set, just report 0 for max/free/used |
903 | * blocks, like simple_statfs() */ | |
90481622 DG |
904 | if (sbinfo->spool) { |
905 | long free_pages; | |
906 | ||
907 | spin_lock(&sbinfo->spool->lock); | |
908 | buf->f_blocks = sbinfo->spool->max_hpages; | |
909 | free_pages = sbinfo->spool->max_hpages | |
910 | - sbinfo->spool->used_hpages; | |
911 | buf->f_bavail = buf->f_bfree = free_pages; | |
912 | spin_unlock(&sbinfo->spool->lock); | |
74a8a65c DG |
913 | buf->f_files = sbinfo->max_inodes; |
914 | buf->f_ffree = sbinfo->free_inodes; | |
915 | } | |
1da177e4 LT |
916 | spin_unlock(&sbinfo->stat_lock); |
917 | } | |
918 | buf->f_namelen = NAME_MAX; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static void hugetlbfs_put_super(struct super_block *sb) | |
923 | { | |
924 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
925 | ||
926 | if (sbi) { | |
927 | sb->s_fs_info = NULL; | |
90481622 DG |
928 | |
929 | if (sbi->spool) | |
930 | hugepage_put_subpool(sbi->spool); | |
931 | ||
1da177e4 LT |
932 | kfree(sbi); |
933 | } | |
934 | } | |
935 | ||
96527980 CH |
936 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
937 | { | |
938 | if (sbinfo->free_inodes >= 0) { | |
939 | spin_lock(&sbinfo->stat_lock); | |
940 | if (unlikely(!sbinfo->free_inodes)) { | |
941 | spin_unlock(&sbinfo->stat_lock); | |
942 | return 0; | |
943 | } | |
944 | sbinfo->free_inodes--; | |
945 | spin_unlock(&sbinfo->stat_lock); | |
946 | } | |
947 | ||
948 | return 1; | |
949 | } | |
950 | ||
951 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
952 | { | |
953 | if (sbinfo->free_inodes >= 0) { | |
954 | spin_lock(&sbinfo->stat_lock); | |
955 | sbinfo->free_inodes++; | |
956 | spin_unlock(&sbinfo->stat_lock); | |
957 | } | |
958 | } | |
959 | ||
960 | ||
e18b890b | 961 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
962 | |
963 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
964 | { | |
96527980 | 965 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
966 | struct hugetlbfs_inode_info *p; |
967 | ||
96527980 CH |
968 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
969 | return NULL; | |
e94b1766 | 970 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
971 | if (unlikely(!p)) { |
972 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 973 | return NULL; |
96527980 | 974 | } |
4742a35d MK |
975 | |
976 | /* | |
977 | * Any time after allocation, hugetlbfs_destroy_inode can be called | |
978 | * for the inode. mpol_free_shared_policy is unconditionally called | |
979 | * as part of hugetlbfs_destroy_inode. So, initialize policy here | |
980 | * in case of a quick call to destroy. | |
981 | * | |
982 | * Note that the policy is initialized even if we are creating a | |
983 | * private inode. This simplifies hugetlbfs_destroy_inode. | |
984 | */ | |
985 | mpol_shared_policy_init(&p->policy, NULL); | |
986 | ||
1da177e4 LT |
987 | return &p->vfs_inode; |
988 | } | |
989 | ||
fa0d7e3d NP |
990 | static void hugetlbfs_i_callback(struct rcu_head *head) |
991 | { | |
992 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
993 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
994 | } | |
995 | ||
1da177e4 LT |
996 | static void hugetlbfs_destroy_inode(struct inode *inode) |
997 | { | |
96527980 | 998 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 999 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
fa0d7e3d | 1000 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
1da177e4 LT |
1001 | } |
1002 | ||
f5e54d6e | 1003 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
1004 | .write_begin = hugetlbfs_write_begin, |
1005 | .write_end = hugetlbfs_write_end, | |
1da177e4 | 1006 | .set_page_dirty = hugetlbfs_set_page_dirty, |
290408d4 | 1007 | .migratepage = hugetlbfs_migrate_page, |
78bb9203 | 1008 | .error_remove_page = hugetlbfs_error_remove_page, |
1da177e4 LT |
1009 | }; |
1010 | ||
96527980 | 1011 | |
51cc5068 | 1012 | static void init_once(void *foo) |
96527980 CH |
1013 | { |
1014 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
1015 | ||
a35afb83 | 1016 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
1017 | } |
1018 | ||
4b6f5d20 | 1019 | const struct file_operations hugetlbfs_file_operations = { |
34d0640e | 1020 | .read_iter = hugetlbfs_read_iter, |
1da177e4 | 1021 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 1022 | .fsync = noop_fsync, |
1da177e4 | 1023 | .get_unmapped_area = hugetlb_get_unmapped_area, |
70c3547e MK |
1024 | .llseek = default_llseek, |
1025 | .fallocate = hugetlbfs_fallocate, | |
1da177e4 LT |
1026 | }; |
1027 | ||
92e1d5be | 1028 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
1029 | .create = hugetlbfs_create, |
1030 | .lookup = simple_lookup, | |
1031 | .link = simple_link, | |
1032 | .unlink = simple_unlink, | |
1033 | .symlink = hugetlbfs_symlink, | |
1034 | .mkdir = hugetlbfs_mkdir, | |
1035 | .rmdir = simple_rmdir, | |
1036 | .mknod = hugetlbfs_mknod, | |
1037 | .rename = simple_rename, | |
1038 | .setattr = hugetlbfs_setattr, | |
1039 | }; | |
1040 | ||
92e1d5be | 1041 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
1042 | .setattr = hugetlbfs_setattr, |
1043 | }; | |
1044 | ||
ee9b6d61 | 1045 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 LT |
1046 | .alloc_inode = hugetlbfs_alloc_inode, |
1047 | .destroy_inode = hugetlbfs_destroy_inode, | |
2bbbda30 | 1048 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 1049 | .statfs = hugetlbfs_statfs, |
1da177e4 | 1050 | .put_super = hugetlbfs_put_super, |
4a25220d | 1051 | .show_options = hugetlbfs_show_options, |
1da177e4 LT |
1052 | }; |
1053 | ||
4a25220d | 1054 | enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT }; |
7ca02d0a MK |
1055 | |
1056 | /* | |
1057 | * Convert size option passed from command line to number of huge pages | |
1058 | * in the pool specified by hstate. Size option could be in bytes | |
1059 | * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT). | |
1060 | */ | |
4a25220d | 1061 | static long |
7ca02d0a | 1062 | hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt, |
4a25220d | 1063 | enum hugetlbfs_size_type val_type) |
7ca02d0a MK |
1064 | { |
1065 | if (val_type == NO_SIZE) | |
1066 | return -1; | |
1067 | ||
1068 | if (val_type == SIZE_PERCENT) { | |
1069 | size_opt <<= huge_page_shift(h); | |
1070 | size_opt *= h->max_huge_pages; | |
1071 | do_div(size_opt, 100); | |
1072 | } | |
1073 | ||
1074 | size_opt >>= huge_page_shift(h); | |
1075 | return size_opt; | |
1076 | } | |
1077 | ||
1da177e4 LT |
1078 | static int |
1079 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) | |
1080 | { | |
e73a75fa RD |
1081 | char *p, *rest; |
1082 | substring_t args[MAX_OPT_ARGS]; | |
1083 | int option; | |
7ca02d0a | 1084 | unsigned long long max_size_opt = 0, min_size_opt = 0; |
4a25220d | 1085 | enum hugetlbfs_size_type max_val_type = NO_SIZE, min_val_type = NO_SIZE; |
1da177e4 LT |
1086 | |
1087 | if (!options) | |
1088 | return 0; | |
1da177e4 | 1089 | |
e73a75fa RD |
1090 | while ((p = strsep(&options, ",")) != NULL) { |
1091 | int token; | |
b4c07bce LS |
1092 | if (!*p) |
1093 | continue; | |
e73a75fa RD |
1094 | |
1095 | token = match_token(p, tokens, args); | |
1096 | switch (token) { | |
1097 | case Opt_uid: | |
1098 | if (match_int(&args[0], &option)) | |
1099 | goto bad_val; | |
a0eb3a05 EB |
1100 | pconfig->uid = make_kuid(current_user_ns(), option); |
1101 | if (!uid_valid(pconfig->uid)) | |
1102 | goto bad_val; | |
e73a75fa RD |
1103 | break; |
1104 | ||
1105 | case Opt_gid: | |
1106 | if (match_int(&args[0], &option)) | |
1107 | goto bad_val; | |
a0eb3a05 EB |
1108 | pconfig->gid = make_kgid(current_user_ns(), option); |
1109 | if (!gid_valid(pconfig->gid)) | |
1110 | goto bad_val; | |
e73a75fa RD |
1111 | break; |
1112 | ||
1113 | case Opt_mode: | |
1114 | if (match_octal(&args[0], &option)) | |
1115 | goto bad_val; | |
75897d60 | 1116 | pconfig->mode = option & 01777U; |
e73a75fa RD |
1117 | break; |
1118 | ||
1119 | case Opt_size: { | |
e73a75fa RD |
1120 | /* memparse() will accept a K/M/G without a digit */ |
1121 | if (!isdigit(*args[0].from)) | |
1122 | goto bad_val; | |
7ca02d0a MK |
1123 | max_size_opt = memparse(args[0].from, &rest); |
1124 | max_val_type = SIZE_STD; | |
a137e1cc | 1125 | if (*rest == '%') |
7ca02d0a | 1126 | max_val_type = SIZE_PERCENT; |
e73a75fa RD |
1127 | break; |
1128 | } | |
1da177e4 | 1129 | |
e73a75fa RD |
1130 | case Opt_nr_inodes: |
1131 | /* memparse() will accept a K/M/G without a digit */ | |
1132 | if (!isdigit(*args[0].from)) | |
1133 | goto bad_val; | |
1134 | pconfig->nr_inodes = memparse(args[0].from, &rest); | |
1135 | break; | |
1136 | ||
a137e1cc AK |
1137 | case Opt_pagesize: { |
1138 | unsigned long ps; | |
1139 | ps = memparse(args[0].from, &rest); | |
1140 | pconfig->hstate = size_to_hstate(ps); | |
1141 | if (!pconfig->hstate) { | |
9b857d26 | 1142 | pr_err("Unsupported page size %lu MB\n", |
a137e1cc AK |
1143 | ps >> 20); |
1144 | return -EINVAL; | |
1145 | } | |
1146 | break; | |
1147 | } | |
1148 | ||
7ca02d0a MK |
1149 | case Opt_min_size: { |
1150 | /* memparse() will accept a K/M/G without a digit */ | |
1151 | if (!isdigit(*args[0].from)) | |
1152 | goto bad_val; | |
1153 | min_size_opt = memparse(args[0].from, &rest); | |
1154 | min_val_type = SIZE_STD; | |
1155 | if (*rest == '%') | |
1156 | min_val_type = SIZE_PERCENT; | |
1157 | break; | |
1158 | } | |
1159 | ||
e73a75fa | 1160 | default: |
9b857d26 | 1161 | pr_err("Bad mount option: \"%s\"\n", p); |
b4c07bce | 1162 | return -EINVAL; |
e73a75fa RD |
1163 | break; |
1164 | } | |
1da177e4 | 1165 | } |
a137e1cc | 1166 | |
7ca02d0a MK |
1167 | /* |
1168 | * Use huge page pool size (in hstate) to convert the size | |
1169 | * options to number of huge pages. If NO_SIZE, -1 is returned. | |
1170 | */ | |
1171 | pconfig->max_hpages = hugetlbfs_size_to_hpages(pconfig->hstate, | |
1172 | max_size_opt, max_val_type); | |
1173 | pconfig->min_hpages = hugetlbfs_size_to_hpages(pconfig->hstate, | |
1174 | min_size_opt, min_val_type); | |
1175 | ||
1176 | /* | |
1177 | * If max_size was specified, then min_size must be smaller | |
1178 | */ | |
1179 | if (max_val_type > NO_SIZE && | |
1180 | pconfig->min_hpages > pconfig->max_hpages) { | |
1181 | pr_err("minimum size can not be greater than maximum size\n"); | |
1182 | return -EINVAL; | |
a137e1cc AK |
1183 | } |
1184 | ||
1da177e4 | 1185 | return 0; |
e73a75fa RD |
1186 | |
1187 | bad_val: | |
9b857d26 | 1188 | pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); |
c12ddba0 | 1189 | return -EINVAL; |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | static int | |
1193 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) | |
1194 | { | |
1da177e4 LT |
1195 | int ret; |
1196 | struct hugetlbfs_config config; | |
1197 | struct hugetlbfs_sb_info *sbinfo; | |
1198 | ||
7ca02d0a | 1199 | config.max_hpages = -1; /* No limit on size by default */ |
1da177e4 | 1200 | config.nr_inodes = -1; /* No limit on number of inodes by default */ |
77c70de1 DH |
1201 | config.uid = current_fsuid(); |
1202 | config.gid = current_fsgid(); | |
1da177e4 | 1203 | config.mode = 0755; |
a137e1cc | 1204 | config.hstate = &default_hstate; |
7ca02d0a | 1205 | config.min_hpages = -1; /* No default minimum size */ |
1da177e4 | 1206 | ret = hugetlbfs_parse_options(data, &config); |
1da177e4 LT |
1207 | if (ret) |
1208 | return ret; | |
1209 | ||
1210 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); | |
1211 | if (!sbinfo) | |
1212 | return -ENOMEM; | |
1213 | sb->s_fs_info = sbinfo; | |
a137e1cc | 1214 | sbinfo->hstate = config.hstate; |
1da177e4 | 1215 | spin_lock_init(&sbinfo->stat_lock); |
1da177e4 LT |
1216 | sbinfo->max_inodes = config.nr_inodes; |
1217 | sbinfo->free_inodes = config.nr_inodes; | |
90481622 | 1218 | sbinfo->spool = NULL; |
4a25220d DH |
1219 | sbinfo->uid = config.uid; |
1220 | sbinfo->gid = config.gid; | |
1221 | sbinfo->mode = config.mode; | |
1222 | ||
7ca02d0a MK |
1223 | /* |
1224 | * Allocate and initialize subpool if maximum or minimum size is | |
1225 | * specified. Any needed reservations (for minimim size) are taken | |
1226 | * taken when the subpool is created. | |
1227 | */ | |
1228 | if (config.max_hpages != -1 || config.min_hpages != -1) { | |
1229 | sbinfo->spool = hugepage_new_subpool(config.hstate, | |
1230 | config.max_hpages, | |
1231 | config.min_hpages); | |
90481622 DG |
1232 | if (!sbinfo->spool) |
1233 | goto out_free; | |
1234 | } | |
1da177e4 | 1235 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
a137e1cc AK |
1236 | sb->s_blocksize = huge_page_size(config.hstate); |
1237 | sb->s_blocksize_bits = huge_page_shift(config.hstate); | |
1da177e4 LT |
1238 | sb->s_magic = HUGETLBFS_MAGIC; |
1239 | sb->s_op = &hugetlbfs_ops; | |
1240 | sb->s_time_gran = 1; | |
48fde701 AV |
1241 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
1242 | if (!sb->s_root) | |
1da177e4 | 1243 | goto out_free; |
1da177e4 LT |
1244 | return 0; |
1245 | out_free: | |
6e6870d4 | 1246 | kfree(sbinfo->spool); |
1da177e4 LT |
1247 | kfree(sbinfo); |
1248 | return -ENOMEM; | |
1249 | } | |
1250 | ||
3c26ff6e AV |
1251 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
1252 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1253 | { |
3c26ff6e | 1254 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
1da177e4 LT |
1255 | } |
1256 | ||
1257 | static struct file_system_type hugetlbfs_fs_type = { | |
1258 | .name = "hugetlbfs", | |
3c26ff6e | 1259 | .mount = hugetlbfs_mount, |
1da177e4 LT |
1260 | .kill_sb = kill_litter_super, |
1261 | }; | |
1262 | ||
42d7395f | 1263 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
1da177e4 | 1264 | |
ef1ff6b8 | 1265 | static int can_do_hugetlb_shm(void) |
1da177e4 | 1266 | { |
a0eb3a05 EB |
1267 | kgid_t shm_group; |
1268 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); | |
1269 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); | |
1da177e4 LT |
1270 | } |
1271 | ||
42d7395f AK |
1272 | static int get_hstate_idx(int page_size_log) |
1273 | { | |
af73e4d9 | 1274 | struct hstate *h = hstate_sizelog(page_size_log); |
42d7395f | 1275 | |
42d7395f AK |
1276 | if (!h) |
1277 | return -1; | |
1278 | return h - hstates; | |
1279 | } | |
1280 | ||
be1d2cf5 | 1281 | static const struct dentry_operations anon_ops = { |
118b2302 | 1282 | .d_dname = simple_dname |
0df4d6e5 AV |
1283 | }; |
1284 | ||
af73e4d9 NH |
1285 | /* |
1286 | * Note that size should be aligned to proper hugepage size in caller side, | |
1287 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. | |
1288 | */ | |
1289 | struct file *hugetlb_file_setup(const char *name, size_t size, | |
1290 | vm_flags_t acctflag, struct user_struct **user, | |
42d7395f | 1291 | int creat_flags, int page_size_log) |
1da177e4 | 1292 | { |
39b65252 | 1293 | struct file *file = ERR_PTR(-ENOMEM); |
1da177e4 | 1294 | struct inode *inode; |
2c48b9c4 | 1295 | struct path path; |
0df4d6e5 | 1296 | struct super_block *sb; |
1da177e4 | 1297 | struct qstr quick_string; |
42d7395f AK |
1298 | int hstate_idx; |
1299 | ||
1300 | hstate_idx = get_hstate_idx(page_size_log); | |
1301 | if (hstate_idx < 0) | |
1302 | return ERR_PTR(-ENODEV); | |
1da177e4 | 1303 | |
353d5c30 | 1304 | *user = NULL; |
42d7395f | 1305 | if (!hugetlbfs_vfsmount[hstate_idx]) |
5bc98594 AM |
1306 | return ERR_PTR(-ENOENT); |
1307 | ||
ef1ff6b8 | 1308 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
353d5c30 HD |
1309 | *user = current_user(); |
1310 | if (user_shm_lock(size, *user)) { | |
21a3c273 | 1311 | task_lock(current); |
9b857d26 | 1312 | pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", |
21a3c273 DR |
1313 | current->comm, current->pid); |
1314 | task_unlock(current); | |
353d5c30 HD |
1315 | } else { |
1316 | *user = NULL; | |
2584e517 | 1317 | return ERR_PTR(-EPERM); |
353d5c30 | 1318 | } |
2584e517 | 1319 | } |
1da177e4 | 1320 | |
0df4d6e5 | 1321 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
9d66586f | 1322 | quick_string.name = name; |
1da177e4 LT |
1323 | quick_string.len = strlen(quick_string.name); |
1324 | quick_string.hash = 0; | |
0df4d6e5 | 1325 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
2c48b9c4 | 1326 | if (!path.dentry) |
1da177e4 LT |
1327 | goto out_shm_unlock; |
1328 | ||
0df4d6e5 | 1329 | d_set_d_op(path.dentry, &anon_ops); |
42d7395f | 1330 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
39b65252 | 1331 | file = ERR_PTR(-ENOSPC); |
0df4d6e5 | 1332 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 1333 | if (!inode) |
ce8d2cdf | 1334 | goto out_dentry; |
e1832f29 SS |
1335 | if (creat_flags == HUGETLB_SHMFS_INODE) |
1336 | inode->i_flags |= S_PRIVATE; | |
1da177e4 | 1337 | |
39b65252 | 1338 | file = ERR_PTR(-ENOMEM); |
af73e4d9 NH |
1339 | if (hugetlb_reserve_pages(inode, 0, |
1340 | size >> huge_page_shift(hstate_inode(inode)), NULL, | |
1341 | acctflag)) | |
b45b5bd6 DG |
1342 | goto out_inode; |
1343 | ||
2c48b9c4 | 1344 | d_instantiate(path.dentry, inode); |
1da177e4 | 1345 | inode->i_size = size; |
6d6b77f1 | 1346 | clear_nlink(inode); |
ce8d2cdf | 1347 | |
2c48b9c4 | 1348 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
ce8d2cdf | 1349 | &hugetlbfs_file_operations); |
39b65252 | 1350 | if (IS_ERR(file)) |
b4d232e6 | 1351 | goto out_dentry; /* inode is already attached */ |
ce8d2cdf | 1352 | |
1da177e4 LT |
1353 | return file; |
1354 | ||
b45b5bd6 DG |
1355 | out_inode: |
1356 | iput(inode); | |
1da177e4 | 1357 | out_dentry: |
2c48b9c4 | 1358 | path_put(&path); |
1da177e4 | 1359 | out_shm_unlock: |
353d5c30 HD |
1360 | if (*user) { |
1361 | user_shm_unlock(size, *user); | |
1362 | *user = NULL; | |
1363 | } | |
39b65252 | 1364 | return file; |
1da177e4 LT |
1365 | } |
1366 | ||
1367 | static int __init init_hugetlbfs_fs(void) | |
1368 | { | |
42d7395f | 1369 | struct hstate *h; |
1da177e4 | 1370 | int error; |
42d7395f | 1371 | int i; |
1da177e4 | 1372 | |
457c1b27 | 1373 | if (!hugepages_supported()) { |
9b857d26 | 1374 | pr_info("disabling because there are no supported hugepage sizes\n"); |
457c1b27 NA |
1375 | return -ENOTSUPP; |
1376 | } | |
1377 | ||
d1d5e05f | 1378 | error = -ENOMEM; |
1da177e4 LT |
1379 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1380 | sizeof(struct hugetlbfs_inode_info), | |
5d097056 | 1381 | 0, SLAB_ACCOUNT, init_once); |
1da177e4 | 1382 | if (hugetlbfs_inode_cachep == NULL) |
e0bf68dd | 1383 | goto out2; |
1da177e4 LT |
1384 | |
1385 | error = register_filesystem(&hugetlbfs_fs_type); | |
1386 | if (error) | |
1387 | goto out; | |
1388 | ||
42d7395f AK |
1389 | i = 0; |
1390 | for_each_hstate(h) { | |
1391 | char buf[50]; | |
1392 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); | |
1da177e4 | 1393 | |
42d7395f AK |
1394 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
1395 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, | |
1396 | buf); | |
1da177e4 | 1397 | |
42d7395f | 1398 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
9b857d26 | 1399 | pr_err("Cannot mount internal hugetlbfs for " |
42d7395f AK |
1400 | "page size %uK", ps_kb); |
1401 | error = PTR_ERR(hugetlbfs_vfsmount[i]); | |
1402 | hugetlbfs_vfsmount[i] = NULL; | |
1403 | } | |
1404 | i++; | |
1405 | } | |
1406 | /* Non default hstates are optional */ | |
1407 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) | |
1408 | return 0; | |
1da177e4 LT |
1409 | |
1410 | out: | |
d1d5e05f | 1411 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
e0bf68dd | 1412 | out2: |
1da177e4 LT |
1413 | return error; |
1414 | } | |
3e89e1c5 | 1415 | fs_initcall(init_hugetlbfs_fs) |