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> | |
32021982 | 30 | #include <linux/fs_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> |
88590253 | 41 | #include <linux/sched/mm.h> |
1da177e4 | 42 | |
ee9b6d61 | 43 | static const struct super_operations hugetlbfs_ops; |
f5e54d6e | 44 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 45 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
46 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
47 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 | 48 | |
32021982 DH |
49 | enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT }; |
50 | ||
51 | struct hugetlbfs_fs_context { | |
4a25220d | 52 | struct hstate *hstate; |
32021982 DH |
53 | unsigned long long max_size_opt; |
54 | unsigned long long min_size_opt; | |
4a25220d DH |
55 | long max_hpages; |
56 | long nr_inodes; | |
57 | long min_hpages; | |
32021982 DH |
58 | enum hugetlbfs_size_type max_val_type; |
59 | enum hugetlbfs_size_type min_val_type; | |
4a25220d DH |
60 | kuid_t uid; |
61 | kgid_t gid; | |
62 | umode_t mode; | |
a1d776ee DG |
63 | }; |
64 | ||
1da177e4 LT |
65 | int sysctl_hugetlb_shm_group; |
66 | ||
32021982 DH |
67 | enum hugetlb_param { |
68 | Opt_gid, | |
69 | Opt_min_size, | |
70 | Opt_mode, | |
71 | Opt_nr_inodes, | |
72 | Opt_pagesize, | |
73 | Opt_size, | |
74 | Opt_uid, | |
e73a75fa RD |
75 | }; |
76 | ||
d7167b14 | 77 | static const struct fs_parameter_spec hugetlb_fs_parameters[] = { |
32021982 DH |
78 | fsparam_u32 ("gid", Opt_gid), |
79 | fsparam_string("min_size", Opt_min_size), | |
e0f7e2b2 | 80 | fsparam_u32oct("mode", Opt_mode), |
32021982 DH |
81 | fsparam_string("nr_inodes", Opt_nr_inodes), |
82 | fsparam_string("pagesize", Opt_pagesize), | |
83 | fsparam_string("size", Opt_size), | |
84 | fsparam_u32 ("uid", Opt_uid), | |
85 | {} | |
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 | ||
63489f8e MK |
121 | /* |
122 | * Mask used when checking the page offset value passed in via system | |
123 | * calls. This value will be converted to a loff_t which is signed. | |
124 | * Therefore, we want to check the upper PAGE_SHIFT + 1 bits of the | |
125 | * value. The extra bit (- 1 in the shift value) is to take the sign | |
126 | * bit into account. | |
127 | */ | |
128 | #define PGOFF_LOFFT_MAX \ | |
129 | (((1UL << (PAGE_SHIFT + 1)) - 1) << (BITS_PER_LONG - (PAGE_SHIFT + 1))) | |
130 | ||
1da177e4 LT |
131 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
132 | { | |
496ad9aa | 133 | struct inode *inode = file_inode(file); |
22247efd | 134 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
1da177e4 LT |
135 | loff_t len, vma_len; |
136 | int ret; | |
a5516438 | 137 | struct hstate *h = hstate_file(file); |
1da177e4 | 138 | |
68589bc3 | 139 | /* |
dec4ad86 DG |
140 | * vma address alignment (but not the pgoff alignment) has |
141 | * already been checked by prepare_hugepage_range. If you add | |
142 | * any error returns here, do so after setting VM_HUGETLB, so | |
143 | * is_vm_hugetlb_page tests below unmap_region go the right | |
45e55300 | 144 | * way when do_mmap unwinds (may be important on powerpc |
dec4ad86 | 145 | * and ia64). |
68589bc3 | 146 | */ |
a2fce914 | 147 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
68589bc3 | 148 | vma->vm_ops = &hugetlb_vm_ops; |
1da177e4 | 149 | |
22247efd PX |
150 | ret = seal_check_future_write(info->seals, vma); |
151 | if (ret) | |
152 | return ret; | |
153 | ||
045c7a3f | 154 | /* |
63489f8e | 155 | * page based offset in vm_pgoff could be sufficiently large to |
5df63c2a MK |
156 | * overflow a loff_t when converted to byte offset. This can |
157 | * only happen on architectures where sizeof(loff_t) == | |
158 | * sizeof(unsigned long). So, only check in those instances. | |
045c7a3f | 159 | */ |
5df63c2a MK |
160 | if (sizeof(unsigned long) == sizeof(loff_t)) { |
161 | if (vma->vm_pgoff & PGOFF_LOFFT_MAX) | |
162 | return -EINVAL; | |
163 | } | |
045c7a3f | 164 | |
63489f8e | 165 | /* must be huge page aligned */ |
2b37c35e | 166 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
167 | return -EINVAL; |
168 | ||
1da177e4 | 169 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
045c7a3f MK |
170 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
171 | /* check for overflow */ | |
172 | if (len < vma_len) | |
173 | return -EINVAL; | |
1da177e4 | 174 | |
5955102c | 175 | inode_lock(inode); |
1da177e4 | 176 | file_accessed(file); |
1da177e4 LT |
177 | |
178 | ret = -ENOMEM; | |
33b8f84a | 179 | if (!hugetlb_reserve_pages(inode, |
a5516438 | 180 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
181 | len >> huge_page_shift(h), vma, |
182 | vma->vm_flags)) | |
a43a8c39 | 183 | goto out; |
b45b5bd6 | 184 | |
4c887265 | 185 | ret = 0; |
b6174df5 | 186 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
045c7a3f | 187 | i_size_write(inode, len); |
1da177e4 | 188 | out: |
5955102c | 189 | inode_unlock(inode); |
1da177e4 LT |
190 | |
191 | return ret; | |
192 | } | |
193 | ||
194 | /* | |
3e4e28c5 | 195 | * Called under mmap_write_lock(mm). |
1da177e4 LT |
196 | */ |
197 | ||
d2ba27e8 | 198 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
88590253 SH |
199 | static unsigned long |
200 | hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr, | |
201 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
202 | { | |
203 | struct hstate *h = hstate_file(file); | |
204 | struct vm_unmapped_area_info info; | |
205 | ||
206 | info.flags = 0; | |
207 | info.length = len; | |
208 | info.low_limit = current->mm->mmap_base; | |
5f24d5a5 | 209 | info.high_limit = arch_get_mmap_end(addr); |
88590253 SH |
210 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
211 | info.align_offset = 0; | |
212 | return vm_unmapped_area(&info); | |
213 | } | |
214 | ||
215 | static unsigned long | |
216 | hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr, | |
217 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
218 | { | |
219 | struct hstate *h = hstate_file(file); | |
220 | struct vm_unmapped_area_info info; | |
221 | ||
222 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
223 | info.length = len; | |
224 | info.low_limit = max(PAGE_SIZE, mmap_min_addr); | |
5f24d5a5 | 225 | info.high_limit = arch_get_mmap_base(addr, current->mm->mmap_base); |
88590253 SH |
226 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
227 | info.align_offset = 0; | |
228 | addr = vm_unmapped_area(&info); | |
229 | ||
230 | /* | |
231 | * A failed mmap() very likely causes application failure, | |
232 | * so fall back to the bottom-up function here. This scenario | |
233 | * can happen with large stack limits and large mmap() | |
234 | * allocations. | |
235 | */ | |
236 | if (unlikely(offset_in_page(addr))) { | |
237 | VM_BUG_ON(addr != -ENOMEM); | |
238 | info.flags = 0; | |
239 | info.low_limit = current->mm->mmap_base; | |
5f24d5a5 | 240 | info.high_limit = arch_get_mmap_end(addr); |
88590253 SH |
241 | addr = vm_unmapped_area(&info); |
242 | } | |
243 | ||
244 | return addr; | |
245 | } | |
246 | ||
1da177e4 LT |
247 | static unsigned long |
248 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
249 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
250 | { | |
251 | struct mm_struct *mm = current->mm; | |
252 | struct vm_area_struct *vma; | |
a5516438 | 253 | struct hstate *h = hstate_file(file); |
5f24d5a5 | 254 | const unsigned long mmap_end = arch_get_mmap_end(addr); |
1da177e4 | 255 | |
a5516438 | 256 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
257 | return -EINVAL; |
258 | if (len > TASK_SIZE) | |
259 | return -ENOMEM; | |
260 | ||
036e0856 | 261 | if (flags & MAP_FIXED) { |
a5516438 | 262 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
263 | return -EINVAL; |
264 | return addr; | |
265 | } | |
266 | ||
1da177e4 | 267 | if (addr) { |
a5516438 | 268 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 | 269 | vma = find_vma(mm, addr); |
5f24d5a5 | 270 | if (mmap_end - len >= addr && |
1be7107f | 271 | (!vma || addr + len <= vm_start_gap(vma))) |
1da177e4 LT |
272 | return addr; |
273 | } | |
274 | ||
88590253 SH |
275 | /* |
276 | * Use mm->get_unmapped_area value as a hint to use topdown routine. | |
277 | * If architectures have special needs, they should define their own | |
278 | * version of hugetlb_get_unmapped_area. | |
279 | */ | |
280 | if (mm->get_unmapped_area == arch_get_unmapped_area_topdown) | |
281 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |
282 | pgoff, flags); | |
283 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |
284 | pgoff, flags); | |
1da177e4 LT |
285 | } |
286 | #endif | |
287 | ||
34d0640e | 288 | static size_t |
e63e1e5a | 289 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
34d0640e | 290 | struct iov_iter *to, unsigned long size) |
e63e1e5a | 291 | { |
34d0640e | 292 | size_t copied = 0; |
e63e1e5a BP |
293 | int i, chunksize; |
294 | ||
e63e1e5a | 295 | /* Find which 4k chunk and offset with in that chunk */ |
09cbfeaf KS |
296 | i = offset >> PAGE_SHIFT; |
297 | offset = offset & ~PAGE_MASK; | |
e63e1e5a BP |
298 | |
299 | while (size) { | |
34d0640e | 300 | size_t n; |
09cbfeaf | 301 | chunksize = PAGE_SIZE; |
e63e1e5a BP |
302 | if (offset) |
303 | chunksize -= offset; | |
304 | if (chunksize > size) | |
305 | chunksize = size; | |
34d0640e AV |
306 | n = copy_page_to_iter(&page[i], offset, chunksize, to); |
307 | copied += n; | |
308 | if (n != chunksize) | |
309 | return copied; | |
e63e1e5a BP |
310 | offset = 0; |
311 | size -= chunksize; | |
e63e1e5a BP |
312 | i++; |
313 | } | |
34d0640e | 314 | return copied; |
e63e1e5a BP |
315 | } |
316 | ||
317 | /* | |
318 | * Support for read() - Find the page attached to f_mapping and copy out the | |
c7e285e3 | 319 | * data. Its *very* similar to generic_file_buffered_read(), we can't use that |
ea1754a0 | 320 | * since it has PAGE_SIZE assumptions. |
e63e1e5a | 321 | */ |
34d0640e | 322 | static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) |
e63e1e5a | 323 | { |
34d0640e AV |
324 | struct file *file = iocb->ki_filp; |
325 | struct hstate *h = hstate_file(file); | |
326 | struct address_space *mapping = file->f_mapping; | |
e63e1e5a | 327 | struct inode *inode = mapping->host; |
34d0640e AV |
328 | unsigned long index = iocb->ki_pos >> huge_page_shift(h); |
329 | unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); | |
e63e1e5a BP |
330 | unsigned long end_index; |
331 | loff_t isize; | |
332 | ssize_t retval = 0; | |
333 | ||
34d0640e | 334 | while (iov_iter_count(to)) { |
e63e1e5a | 335 | struct page *page; |
34d0640e | 336 | size_t nr, copied; |
e63e1e5a BP |
337 | |
338 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 339 | nr = huge_page_size(h); |
a05b0855 AK |
340 | isize = i_size_read(inode); |
341 | if (!isize) | |
34d0640e | 342 | break; |
a05b0855 | 343 | end_index = (isize - 1) >> huge_page_shift(h); |
34d0640e AV |
344 | if (index > end_index) |
345 | break; | |
346 | if (index == end_index) { | |
a5516438 | 347 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 348 | if (nr <= offset) |
34d0640e | 349 | break; |
e63e1e5a BP |
350 | } |
351 | nr = nr - offset; | |
352 | ||
353 | /* Find the page */ | |
a05b0855 | 354 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
355 | if (unlikely(page == NULL)) { |
356 | /* | |
357 | * We have a HOLE, zero out the user-buffer for the | |
358 | * length of the hole or request. | |
359 | */ | |
34d0640e | 360 | copied = iov_iter_zero(nr, to); |
e63e1e5a | 361 | } else { |
a05b0855 AK |
362 | unlock_page(page); |
363 | ||
e63e1e5a BP |
364 | /* |
365 | * We have the page, copy it to user space buffer. | |
366 | */ | |
34d0640e | 367 | copied = hugetlbfs_read_actor(page, offset, to, nr); |
09cbfeaf | 368 | put_page(page); |
e63e1e5a | 369 | } |
34d0640e AV |
370 | offset += copied; |
371 | retval += copied; | |
372 | if (copied != nr && iov_iter_count(to)) { | |
373 | if (!retval) | |
374 | retval = -EFAULT; | |
375 | break; | |
e63e1e5a | 376 | } |
a5516438 AK |
377 | index += offset >> huge_page_shift(h); |
378 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 379 | } |
34d0640e | 380 | iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
381 | return retval; |
382 | } | |
383 | ||
800d15a5 NP |
384 | static int hugetlbfs_write_begin(struct file *file, |
385 | struct address_space *mapping, | |
386 | loff_t pos, unsigned len, unsigned flags, | |
387 | struct page **pagep, void **fsdata) | |
1da177e4 LT |
388 | { |
389 | return -EINVAL; | |
390 | } | |
391 | ||
800d15a5 NP |
392 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
393 | loff_t pos, unsigned len, unsigned copied, | |
394 | struct page *page, void *fsdata) | |
1da177e4 | 395 | { |
800d15a5 | 396 | BUG(); |
1da177e4 LT |
397 | return -EINVAL; |
398 | } | |
399 | ||
b5cec28d | 400 | static void remove_huge_page(struct page *page) |
1da177e4 | 401 | { |
b9ea2515 | 402 | ClearPageDirty(page); |
1da177e4 | 403 | ClearPageUptodate(page); |
bd65cb86 | 404 | delete_from_page_cache(page); |
1da177e4 LT |
405 | } |
406 | ||
4aae8d1c | 407 | static void |
f808c13f | 408 | hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end) |
4aae8d1c MK |
409 | { |
410 | struct vm_area_struct *vma; | |
411 | ||
412 | /* | |
d6aba4c8 SC |
413 | * end == 0 indicates that the entire range after start should be |
414 | * unmapped. Note, end is exclusive, whereas the interval tree takes | |
415 | * an inclusive "last". | |
4aae8d1c | 416 | */ |
d6aba4c8 | 417 | vma_interval_tree_foreach(vma, root, start, end ? end - 1 : ULONG_MAX) { |
4aae8d1c MK |
418 | unsigned long v_offset; |
419 | unsigned long v_end; | |
420 | ||
421 | /* | |
422 | * Can the expression below overflow on 32-bit arches? | |
423 | * No, because the interval tree returns us only those vmas | |
424 | * which overlap the truncated area starting at pgoff, | |
425 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
426 | */ | |
427 | if (vma->vm_pgoff < start) | |
428 | v_offset = (start - vma->vm_pgoff) << PAGE_SHIFT; | |
429 | else | |
430 | v_offset = 0; | |
431 | ||
432 | if (!end) | |
433 | v_end = vma->vm_end; | |
434 | else { | |
435 | v_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) | |
436 | + vma->vm_start; | |
437 | if (v_end > vma->vm_end) | |
438 | v_end = vma->vm_end; | |
439 | } | |
440 | ||
441 | unmap_hugepage_range(vma, vma->vm_start + v_offset, v_end, | |
442 | NULL); | |
443 | } | |
444 | } | |
b5cec28d MK |
445 | |
446 | /* | |
447 | * remove_inode_hugepages handles two distinct cases: truncation and hole | |
448 | * punch. There are subtle differences in operation for each case. | |
4aae8d1c | 449 | * |
b5cec28d MK |
450 | * truncation is indicated by end of range being LLONG_MAX |
451 | * In this case, we first scan the range and release found pages. | |
1935ebd3 | 452 | * After releasing pages, hugetlb_unreserve_pages cleans up region/reserve |
e7c58097 | 453 | * maps and global counts. Page faults can not race with truncation |
87bf91d3 MK |
454 | * in this routine. hugetlb_no_page() holds i_mmap_rwsem and prevents |
455 | * page faults in the truncated range by checking i_size. i_size is | |
456 | * modified while holding i_mmap_rwsem. | |
b5cec28d MK |
457 | * hole punch is indicated if end is not LLONG_MAX |
458 | * In the hole punch case we scan the range and release found pages. | |
1935ebd3 ML |
459 | * Only when releasing a page is the associated region/reserve map |
460 | * deleted. The region/reserve map for ranges without associated | |
e7c58097 MK |
461 | * pages are not modified. Page faults can race with hole punch. |
462 | * This is indicated if we find a mapped page. | |
b5cec28d MK |
463 | * Note: If the passed end of range value is beyond the end of file, but |
464 | * not LLONG_MAX this routine still performs a hole punch operation. | |
465 | */ | |
466 | static void remove_inode_hugepages(struct inode *inode, loff_t lstart, | |
467 | loff_t lend) | |
1da177e4 | 468 | { |
a5516438 | 469 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 470 | struct address_space *mapping = &inode->i_data; |
a5516438 | 471 | const pgoff_t start = lstart >> huge_page_shift(h); |
b5cec28d | 472 | const pgoff_t end = lend >> huge_page_shift(h); |
1da177e4 | 473 | struct pagevec pvec; |
d72dc8a2 | 474 | pgoff_t next, index; |
a43a8c39 | 475 | int i, freed = 0; |
b5cec28d | 476 | bool truncate_op = (lend == LLONG_MAX); |
1da177e4 | 477 | |
86679820 | 478 | pagevec_init(&pvec); |
1da177e4 | 479 | next = start; |
b5cec28d | 480 | while (next < end) { |
b5cec28d | 481 | /* |
1817889e | 482 | * When no more pages are found, we are done. |
b5cec28d | 483 | */ |
397162ff | 484 | if (!pagevec_lookup_range(&pvec, mapping, &next, end - 1)) |
1817889e | 485 | break; |
1da177e4 LT |
486 | |
487 | for (i = 0; i < pagevec_count(&pvec); ++i) { | |
488 | struct page *page = pvec.pages[i]; | |
d4241a04 | 489 | u32 hash = 0; |
b5cec28d | 490 | |
d72dc8a2 | 491 | index = page->index; |
87bf91d3 MK |
492 | if (!truncate_op) { |
493 | /* | |
494 | * Only need to hold the fault mutex in the | |
495 | * hole punch case. This prevents races with | |
496 | * page faults. Races are not possible in the | |
497 | * case of truncation. | |
498 | */ | |
d4241a04 | 499 | hash = hugetlb_fault_mutex_hash(mapping, index); |
87bf91d3 MK |
500 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
501 | } | |
e7c58097 | 502 | |
4aae8d1c | 503 | /* |
e7c58097 MK |
504 | * If page is mapped, it was faulted in after being |
505 | * unmapped in caller. Unmap (again) now after taking | |
506 | * the fault mutex. The mutex will prevent faults | |
507 | * until we finish removing the page. | |
508 | * | |
509 | * This race can only happen in the hole punch case. | |
510 | * Getting here in a truncate operation is a bug. | |
4aae8d1c | 511 | */ |
e7c58097 MK |
512 | if (unlikely(page_mapped(page))) { |
513 | BUG_ON(truncate_op); | |
514 | ||
c0d0381a | 515 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
e7c58097 | 516 | i_mmap_lock_write(mapping); |
c0d0381a | 517 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
e7c58097 MK |
518 | hugetlb_vmdelete_list(&mapping->i_mmap, |
519 | index * pages_per_huge_page(h), | |
520 | (index + 1) * pages_per_huge_page(h)); | |
521 | i_mmap_unlock_write(mapping); | |
522 | } | |
4aae8d1c MK |
523 | |
524 | lock_page(page); | |
525 | /* | |
526 | * We must free the huge page and remove from page | |
527 | * cache (remove_huge_page) BEFORE removing the | |
528 | * region/reserve map (hugetlb_unreserve_pages). In | |
529 | * rare out of memory conditions, removal of the | |
72e2936c | 530 | * region/reserve map could fail. Correspondingly, |
531 | * the subpool and global reserve usage count can need | |
532 | * to be adjusted. | |
4aae8d1c | 533 | */ |
e32905e5 | 534 | VM_BUG_ON(HPageRestoreReserve(page)); |
4aae8d1c MK |
535 | remove_huge_page(page); |
536 | freed++; | |
537 | if (!truncate_op) { | |
538 | if (unlikely(hugetlb_unreserve_pages(inode, | |
d72dc8a2 | 539 | index, index + 1, 1))) |
72e2936c | 540 | hugetlb_fix_reserve_counts(inode); |
b5cec28d MK |
541 | } |
542 | ||
1da177e4 | 543 | unlock_page(page); |
87bf91d3 MK |
544 | if (!truncate_op) |
545 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
1da177e4 LT |
546 | } |
547 | huge_pagevec_release(&pvec); | |
1817889e | 548 | cond_resched(); |
1da177e4 | 549 | } |
b5cec28d MK |
550 | |
551 | if (truncate_op) | |
552 | (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); | |
1da177e4 LT |
553 | } |
554 | ||
2bbbda30 | 555 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 556 | { |
9119a41e JK |
557 | struct resv_map *resv_map; |
558 | ||
b5cec28d | 559 | remove_inode_hugepages(inode, 0, LLONG_MAX); |
f27a5136 MK |
560 | |
561 | /* | |
562 | * Get the resv_map from the address space embedded in the inode. | |
563 | * This is the address space which points to any resv_map allocated | |
564 | * at inode creation time. If this is a device special inode, | |
565 | * i_mapping may not point to the original address space. | |
566 | */ | |
567 | resv_map = (struct resv_map *)(&inode->i_data)->private_data; | |
568 | /* Only regular and link inodes have associated reserve maps */ | |
9119a41e JK |
569 | if (resv_map) |
570 | resv_map_release(&resv_map->refs); | |
dbd5768f | 571 | clear_inode(inode); |
149f4211 CH |
572 | } |
573 | ||
e5d319de | 574 | static void hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
1da177e4 | 575 | { |
856fc295 | 576 | pgoff_t pgoff; |
1da177e4 | 577 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 578 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 579 | |
a5516438 | 580 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 581 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 582 | |
83cde9e8 | 583 | i_mmap_lock_write(mapping); |
87bf91d3 | 584 | i_size_write(inode, offset); |
f808c13f | 585 | if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) |
1bfad99a | 586 | hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0); |
c86aa7bb | 587 | i_mmap_unlock_write(mapping); |
e7c58097 | 588 | remove_inode_hugepages(inode, offset, LLONG_MAX); |
1da177e4 LT |
589 | } |
590 | ||
70c3547e MK |
591 | static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) |
592 | { | |
593 | struct hstate *h = hstate_inode(inode); | |
594 | loff_t hpage_size = huge_page_size(h); | |
595 | loff_t hole_start, hole_end; | |
596 | ||
597 | /* | |
598 | * For hole punch round up the beginning offset of the hole and | |
599 | * round down the end. | |
600 | */ | |
601 | hole_start = round_up(offset, hpage_size); | |
602 | hole_end = round_down(offset + len, hpage_size); | |
603 | ||
604 | if (hole_end > hole_start) { | |
605 | struct address_space *mapping = inode->i_mapping; | |
ff62a342 | 606 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
70c3547e | 607 | |
5955102c | 608 | inode_lock(inode); |
ff62a342 | 609 | |
398c0da7 | 610 | /* protected by i_rwsem */ |
ab3948f5 | 611 | if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) { |
ff62a342 MAL |
612 | inode_unlock(inode); |
613 | return -EPERM; | |
614 | } | |
615 | ||
70c3547e | 616 | i_mmap_lock_write(mapping); |
f808c13f | 617 | if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) |
70c3547e MK |
618 | hugetlb_vmdelete_list(&mapping->i_mmap, |
619 | hole_start >> PAGE_SHIFT, | |
620 | hole_end >> PAGE_SHIFT); | |
c86aa7bb | 621 | i_mmap_unlock_write(mapping); |
e7c58097 | 622 | remove_inode_hugepages(inode, hole_start, hole_end); |
5955102c | 623 | inode_unlock(inode); |
70c3547e MK |
624 | } |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, | |
630 | loff_t len) | |
631 | { | |
632 | struct inode *inode = file_inode(file); | |
ff62a342 | 633 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
70c3547e MK |
634 | struct address_space *mapping = inode->i_mapping; |
635 | struct hstate *h = hstate_inode(inode); | |
636 | struct vm_area_struct pseudo_vma; | |
637 | struct mm_struct *mm = current->mm; | |
638 | loff_t hpage_size = huge_page_size(h); | |
639 | unsigned long hpage_shift = huge_page_shift(h); | |
640 | pgoff_t start, index, end; | |
641 | int error; | |
642 | u32 hash; | |
643 | ||
644 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
645 | return -EOPNOTSUPP; | |
646 | ||
647 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
648 | return hugetlbfs_punch_hole(inode, offset, len); | |
649 | ||
650 | /* | |
651 | * Default preallocate case. | |
652 | * For this range, start is rounded down and end is rounded up | |
653 | * as well as being converted to page offsets. | |
654 | */ | |
655 | start = offset >> hpage_shift; | |
656 | end = (offset + len + hpage_size - 1) >> hpage_shift; | |
657 | ||
5955102c | 658 | inode_lock(inode); |
70c3547e MK |
659 | |
660 | /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ | |
661 | error = inode_newsize_ok(inode, offset + len); | |
662 | if (error) | |
663 | goto out; | |
664 | ||
ff62a342 MAL |
665 | if ((info->seals & F_SEAL_GROW) && offset + len > inode->i_size) { |
666 | error = -EPERM; | |
667 | goto out; | |
668 | } | |
669 | ||
70c3547e MK |
670 | /* |
671 | * Initialize a pseudo vma as this is required by the huge page | |
672 | * allocation routines. If NUMA is configured, use page index | |
673 | * as input to create an allocation policy. | |
674 | */ | |
2c4541e2 | 675 | vma_init(&pseudo_vma, mm); |
70c3547e MK |
676 | pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); |
677 | pseudo_vma.vm_file = file; | |
678 | ||
679 | for (index = start; index < end; index++) { | |
680 | /* | |
681 | * This is supposed to be the vaddr where the page is being | |
682 | * faulted in, but we have no vaddr here. | |
683 | */ | |
684 | struct page *page; | |
685 | unsigned long addr; | |
70c3547e MK |
686 | |
687 | cond_resched(); | |
688 | ||
689 | /* | |
690 | * fallocate(2) manpage permits EINTR; we may have been | |
691 | * interrupted because we are using up too much memory. | |
692 | */ | |
693 | if (signal_pending(current)) { | |
694 | error = -EINTR; | |
695 | break; | |
696 | } | |
697 | ||
698 | /* Set numa allocation policy based on index */ | |
699 | hugetlb_set_vma_policy(&pseudo_vma, inode, index); | |
700 | ||
701 | /* addr is the offset within the file (zero based) */ | |
702 | addr = index * hpage_size; | |
703 | ||
87bf91d3 MK |
704 | /* |
705 | * fault mutex taken here, protects against fault path | |
706 | * and hole punch. inode_lock previously taken protects | |
707 | * against truncation. | |
708 | */ | |
188b04a7 | 709 | hash = hugetlb_fault_mutex_hash(mapping, index); |
70c3547e MK |
710 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
711 | ||
712 | /* See if already present in mapping to avoid alloc/free */ | |
713 | page = find_get_page(mapping, index); | |
714 | if (page) { | |
715 | put_page(page); | |
716 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
717 | hugetlb_drop_vma_policy(&pseudo_vma); | |
718 | continue; | |
719 | } | |
720 | ||
88ce3fef ML |
721 | /* |
722 | * Allocate page without setting the avoid_reserve argument. | |
723 | * There certainly are no reserves associated with the | |
724 | * pseudo_vma. However, there could be shared mappings with | |
725 | * reserves for the file at the inode level. If we fallocate | |
726 | * pages in these areas, we need to consume the reserves | |
727 | * to keep reservation accounting consistent. | |
728 | */ | |
729 | page = alloc_huge_page(&pseudo_vma, addr, 0); | |
70c3547e MK |
730 | hugetlb_drop_vma_policy(&pseudo_vma); |
731 | if (IS_ERR(page)) { | |
732 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
733 | error = PTR_ERR(page); | |
734 | goto out; | |
735 | } | |
736 | clear_huge_page(page, addr, pages_per_huge_page(h)); | |
737 | __SetPageUptodate(page); | |
738 | error = huge_add_to_page_cache(page, mapping, index); | |
739 | if (unlikely(error)) { | |
846be085 | 740 | restore_reserve_on_error(h, &pseudo_vma, addr, page); |
70c3547e MK |
741 | put_page(page); |
742 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
743 | goto out; | |
744 | } | |
745 | ||
746 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
747 | ||
8f251a3d | 748 | SetHPageMigratable(page); |
70c3547e | 749 | /* |
70c3547e | 750 | * unlock_page because locked by add_to_page_cache() |
585fc0d2 | 751 | * put_page() due to reference from alloc_huge_page() |
70c3547e | 752 | */ |
70c3547e | 753 | unlock_page(page); |
72639e6d | 754 | put_page(page); |
70c3547e MK |
755 | } |
756 | ||
757 | if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) | |
758 | i_size_write(inode, offset + len); | |
078cd827 | 759 | inode->i_ctime = current_time(inode); |
70c3547e | 760 | out: |
5955102c | 761 | inode_unlock(inode); |
70c3547e MK |
762 | return error; |
763 | } | |
764 | ||
549c7297 CB |
765 | static int hugetlbfs_setattr(struct user_namespace *mnt_userns, |
766 | struct dentry *dentry, struct iattr *attr) | |
1da177e4 | 767 | { |
2b0143b5 | 768 | struct inode *inode = d_inode(dentry); |
a5516438 | 769 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
770 | int error; |
771 | unsigned int ia_valid = attr->ia_valid; | |
ff62a342 | 772 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
1da177e4 | 773 | |
2f221d6f | 774 | error = setattr_prepare(&init_user_ns, dentry, attr); |
1da177e4 | 775 | if (error) |
1025774c | 776 | return error; |
1da177e4 LT |
777 | |
778 | if (ia_valid & ATTR_SIZE) { | |
ff62a342 MAL |
779 | loff_t oldsize = inode->i_size; |
780 | loff_t newsize = attr->ia_size; | |
781 | ||
782 | if (newsize & ~huge_page_mask(h)) | |
1025774c | 783 | return -EINVAL; |
398c0da7 | 784 | /* protected by i_rwsem */ |
ff62a342 MAL |
785 | if ((newsize < oldsize && (info->seals & F_SEAL_SHRINK)) || |
786 | (newsize > oldsize && (info->seals & F_SEAL_GROW))) | |
787 | return -EPERM; | |
e5d319de | 788 | hugetlb_vmtruncate(inode, newsize); |
1da177e4 | 789 | } |
1025774c | 790 | |
2f221d6f | 791 | setattr_copy(&init_user_ns, inode, attr); |
1025774c CH |
792 | mark_inode_dirty(inode); |
793 | return 0; | |
1da177e4 LT |
794 | } |
795 | ||
7d54fa64 | 796 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
32021982 | 797 | struct hugetlbfs_fs_context *ctx) |
1da177e4 LT |
798 | { |
799 | struct inode *inode; | |
1da177e4 LT |
800 | |
801 | inode = new_inode(sb); | |
802 | if (inode) { | |
85fe4025 | 803 | inode->i_ino = get_next_ino(); |
32021982 DH |
804 | inode->i_mode = S_IFDIR | ctx->mode; |
805 | inode->i_uid = ctx->uid; | |
806 | inode->i_gid = ctx->gid; | |
078cd827 | 807 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
7d54fa64 AV |
808 | inode->i_op = &hugetlbfs_dir_inode_operations; |
809 | inode->i_fop = &simple_dir_operations; | |
810 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
811 | inc_nlink(inode); | |
65ed7601 | 812 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
813 | } |
814 | return inode; | |
815 | } | |
816 | ||
b610ded7 | 817 | /* |
c8c06efa | 818 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
b610ded7 | 819 | * be taken from reclaim -- unlike regular filesystems. This needs an |
88f306b6 | 820 | * annotation because huge_pmd_share() does an allocation under hugetlb's |
c8c06efa | 821 | * i_mmap_rwsem. |
b610ded7 | 822 | */ |
c8c06efa | 823 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
b610ded7 | 824 | |
7d54fa64 AV |
825 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
826 | struct inode *dir, | |
18df2252 | 827 | umode_t mode, dev_t dev) |
7d54fa64 AV |
828 | { |
829 | struct inode *inode; | |
58b6e5e8 | 830 | struct resv_map *resv_map = NULL; |
9119a41e | 831 | |
58b6e5e8 MK |
832 | /* |
833 | * Reserve maps are only needed for inodes that can have associated | |
834 | * page allocations. | |
835 | */ | |
836 | if (S_ISREG(mode) || S_ISLNK(mode)) { | |
837 | resv_map = resv_map_alloc(); | |
838 | if (!resv_map) | |
839 | return NULL; | |
840 | } | |
7d54fa64 AV |
841 | |
842 | inode = new_inode(sb); | |
843 | if (inode) { | |
ff62a342 MAL |
844 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
845 | ||
7d54fa64 | 846 | inode->i_ino = get_next_ino(); |
21cb47be | 847 | inode_init_owner(&init_user_ns, inode, dir, mode); |
c8c06efa DB |
848 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
849 | &hugetlbfs_i_mmap_rwsem_key); | |
1da177e4 | 850 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
078cd827 | 851 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
9119a41e | 852 | inode->i_mapping->private_data = resv_map; |
ff62a342 | 853 | info->seals = F_SEAL_SEAL; |
1da177e4 LT |
854 | switch (mode & S_IFMT) { |
855 | default: | |
856 | init_special_inode(inode, mode, dev); | |
857 | break; | |
858 | case S_IFREG: | |
859 | inode->i_op = &hugetlbfs_inode_operations; | |
860 | inode->i_fop = &hugetlbfs_file_operations; | |
861 | break; | |
862 | case S_IFDIR: | |
863 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
864 | inode->i_fop = &simple_dir_operations; | |
865 | ||
866 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 867 | inc_nlink(inode); |
1da177e4 LT |
868 | break; |
869 | case S_IFLNK: | |
870 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 871 | inode_nohighmem(inode); |
1da177e4 LT |
872 | break; |
873 | } | |
e096d0c7 | 874 | lockdep_annotate_inode_mutex_key(inode); |
58b6e5e8 MK |
875 | } else { |
876 | if (resv_map) | |
877 | kref_put(&resv_map->refs, resv_map_release); | |
878 | } | |
9119a41e | 879 | |
1da177e4 LT |
880 | return inode; |
881 | } | |
882 | ||
883 | /* | |
884 | * File creation. Allocate an inode, and we're done.. | |
885 | */ | |
1ab5b82f PS |
886 | static int do_hugetlbfs_mknod(struct inode *dir, |
887 | struct dentry *dentry, | |
888 | umode_t mode, | |
889 | dev_t dev, | |
890 | bool tmpfile) | |
1da177e4 LT |
891 | { |
892 | struct inode *inode; | |
893 | int error = -ENOSPC; | |
7d54fa64 AV |
894 | |
895 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
1da177e4 | 896 | if (inode) { |
078cd827 | 897 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1ab5b82f PS |
898 | if (tmpfile) { |
899 | d_tmpfile(dentry, inode); | |
900 | } else { | |
901 | d_instantiate(dentry, inode); | |
902 | dget(dentry);/* Extra count - pin the dentry in core */ | |
903 | } | |
1da177e4 LT |
904 | error = 0; |
905 | } | |
906 | return error; | |
907 | } | |
908 | ||
549c7297 CB |
909 | static int hugetlbfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
910 | struct dentry *dentry, umode_t mode, dev_t dev) | |
1ab5b82f PS |
911 | { |
912 | return do_hugetlbfs_mknod(dir, dentry, mode, dev, false); | |
913 | } | |
914 | ||
549c7297 CB |
915 | static int hugetlbfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
916 | struct dentry *dentry, umode_t mode) | |
1da177e4 | 917 | { |
549c7297 CB |
918 | int retval = hugetlbfs_mknod(&init_user_ns, dir, dentry, |
919 | mode | S_IFDIR, 0); | |
1da177e4 | 920 | if (!retval) |
d8c76e6f | 921 | inc_nlink(dir); |
1da177e4 LT |
922 | return retval; |
923 | } | |
924 | ||
549c7297 CB |
925 | static int hugetlbfs_create(struct user_namespace *mnt_userns, |
926 | struct inode *dir, struct dentry *dentry, | |
927 | umode_t mode, bool excl) | |
1da177e4 | 928 | { |
549c7297 | 929 | return hugetlbfs_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0); |
1da177e4 LT |
930 | } |
931 | ||
549c7297 CB |
932 | static int hugetlbfs_tmpfile(struct user_namespace *mnt_userns, |
933 | struct inode *dir, struct dentry *dentry, | |
934 | umode_t mode) | |
1ab5b82f PS |
935 | { |
936 | return do_hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0, true); | |
937 | } | |
938 | ||
549c7297 CB |
939 | static int hugetlbfs_symlink(struct user_namespace *mnt_userns, |
940 | struct inode *dir, struct dentry *dentry, | |
941 | const char *symname) | |
1da177e4 LT |
942 | { |
943 | struct inode *inode; | |
944 | int error = -ENOSPC; | |
1da177e4 | 945 | |
7d54fa64 | 946 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
947 | if (inode) { |
948 | int l = strlen(symname)+1; | |
949 | error = page_symlink(inode, symname, l); | |
950 | if (!error) { | |
951 | d_instantiate(dentry, inode); | |
952 | dget(dentry); | |
953 | } else | |
954 | iput(inode); | |
955 | } | |
078cd827 | 956 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4 LT |
957 | |
958 | return error; | |
959 | } | |
960 | ||
290408d4 | 961 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
b969c4ab | 962 | struct page *newpage, struct page *page, |
a6bc32b8 | 963 | enum migrate_mode mode) |
290408d4 NH |
964 | { |
965 | int rc; | |
966 | ||
967 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); | |
78bd5209 | 968 | if (rc != MIGRATEPAGE_SUCCESS) |
290408d4 | 969 | return rc; |
cb6acd01 | 970 | |
d6995da3 MK |
971 | if (hugetlb_page_subpool(page)) { |
972 | hugetlb_set_page_subpool(newpage, hugetlb_page_subpool(page)); | |
973 | hugetlb_set_page_subpool(page, NULL); | |
cb6acd01 MK |
974 | } |
975 | ||
2916ecc0 JG |
976 | if (mode != MIGRATE_SYNC_NO_COPY) |
977 | migrate_page_copy(newpage, page); | |
978 | else | |
979 | migrate_page_states(newpage, page); | |
290408d4 | 980 | |
78bd5209 | 981 | return MIGRATEPAGE_SUCCESS; |
290408d4 NH |
982 | } |
983 | ||
78bb9203 NH |
984 | static int hugetlbfs_error_remove_page(struct address_space *mapping, |
985 | struct page *page) | |
986 | { | |
987 | struct inode *inode = mapping->host; | |
ab615a5b | 988 | pgoff_t index = page->index; |
78bb9203 NH |
989 | |
990 | remove_huge_page(page); | |
ab615a5b MK |
991 | if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1))) |
992 | hugetlb_fix_reserve_counts(inode); | |
993 | ||
78bb9203 NH |
994 | return 0; |
995 | } | |
996 | ||
4a25220d DH |
997 | /* |
998 | * Display the mount options in /proc/mounts. | |
999 | */ | |
1000 | static int hugetlbfs_show_options(struct seq_file *m, struct dentry *root) | |
1001 | { | |
1002 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(root->d_sb); | |
1003 | struct hugepage_subpool *spool = sbinfo->spool; | |
1004 | unsigned long hpage_size = huge_page_size(sbinfo->hstate); | |
1005 | unsigned hpage_shift = huge_page_shift(sbinfo->hstate); | |
1006 | char mod; | |
1007 | ||
1008 | if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) | |
1009 | seq_printf(m, ",uid=%u", | |
1010 | from_kuid_munged(&init_user_ns, sbinfo->uid)); | |
1011 | if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) | |
1012 | seq_printf(m, ",gid=%u", | |
1013 | from_kgid_munged(&init_user_ns, sbinfo->gid)); | |
1014 | if (sbinfo->mode != 0755) | |
1015 | seq_printf(m, ",mode=%o", sbinfo->mode); | |
1016 | if (sbinfo->max_inodes != -1) | |
1017 | seq_printf(m, ",nr_inodes=%lu", sbinfo->max_inodes); | |
1018 | ||
1019 | hpage_size /= 1024; | |
1020 | mod = 'K'; | |
1021 | if (hpage_size >= 1024) { | |
1022 | hpage_size /= 1024; | |
1023 | mod = 'M'; | |
1024 | } | |
1025 | seq_printf(m, ",pagesize=%lu%c", hpage_size, mod); | |
1026 | if (spool) { | |
1027 | if (spool->max_hpages != -1) | |
1028 | seq_printf(m, ",size=%llu", | |
1029 | (unsigned long long)spool->max_hpages << hpage_shift); | |
1030 | if (spool->min_hpages != -1) | |
1031 | seq_printf(m, ",min_size=%llu", | |
1032 | (unsigned long long)spool->min_hpages << hpage_shift); | |
1033 | } | |
1034 | return 0; | |
1035 | } | |
1036 | ||
726c3342 | 1037 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 1038 | { |
726c3342 | 1039 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
2b0143b5 | 1040 | struct hstate *h = hstate_inode(d_inode(dentry)); |
1da177e4 LT |
1041 | |
1042 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 1043 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
1044 | if (sbinfo) { |
1045 | spin_lock(&sbinfo->stat_lock); | |
74a8a65c DG |
1046 | /* If no limits set, just report 0 for max/free/used |
1047 | * blocks, like simple_statfs() */ | |
90481622 DG |
1048 | if (sbinfo->spool) { |
1049 | long free_pages; | |
1050 | ||
1051 | spin_lock(&sbinfo->spool->lock); | |
1052 | buf->f_blocks = sbinfo->spool->max_hpages; | |
1053 | free_pages = sbinfo->spool->max_hpages | |
1054 | - sbinfo->spool->used_hpages; | |
1055 | buf->f_bavail = buf->f_bfree = free_pages; | |
1056 | spin_unlock(&sbinfo->spool->lock); | |
74a8a65c DG |
1057 | buf->f_files = sbinfo->max_inodes; |
1058 | buf->f_ffree = sbinfo->free_inodes; | |
1059 | } | |
1da177e4 LT |
1060 | spin_unlock(&sbinfo->stat_lock); |
1061 | } | |
1062 | buf->f_namelen = NAME_MAX; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static void hugetlbfs_put_super(struct super_block *sb) | |
1067 | { | |
1068 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
1069 | ||
1070 | if (sbi) { | |
1071 | sb->s_fs_info = NULL; | |
90481622 DG |
1072 | |
1073 | if (sbi->spool) | |
1074 | hugepage_put_subpool(sbi->spool); | |
1075 | ||
1da177e4 LT |
1076 | kfree(sbi); |
1077 | } | |
1078 | } | |
1079 | ||
96527980 CH |
1080 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
1081 | { | |
1082 | if (sbinfo->free_inodes >= 0) { | |
1083 | spin_lock(&sbinfo->stat_lock); | |
1084 | if (unlikely(!sbinfo->free_inodes)) { | |
1085 | spin_unlock(&sbinfo->stat_lock); | |
1086 | return 0; | |
1087 | } | |
1088 | sbinfo->free_inodes--; | |
1089 | spin_unlock(&sbinfo->stat_lock); | |
1090 | } | |
1091 | ||
1092 | return 1; | |
1093 | } | |
1094 | ||
1095 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
1096 | { | |
1097 | if (sbinfo->free_inodes >= 0) { | |
1098 | spin_lock(&sbinfo->stat_lock); | |
1099 | sbinfo->free_inodes++; | |
1100 | spin_unlock(&sbinfo->stat_lock); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | ||
e18b890b | 1105 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
1106 | |
1107 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
1108 | { | |
96527980 | 1109 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
1110 | struct hugetlbfs_inode_info *p; |
1111 | ||
96527980 CH |
1112 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
1113 | return NULL; | |
fd60b288 | 1114 | p = alloc_inode_sb(sb, hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
1115 | if (unlikely(!p)) { |
1116 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 1117 | return NULL; |
96527980 | 1118 | } |
4742a35d MK |
1119 | |
1120 | /* | |
1121 | * Any time after allocation, hugetlbfs_destroy_inode can be called | |
1122 | * for the inode. mpol_free_shared_policy is unconditionally called | |
1123 | * as part of hugetlbfs_destroy_inode. So, initialize policy here | |
1124 | * in case of a quick call to destroy. | |
1125 | * | |
1126 | * Note that the policy is initialized even if we are creating a | |
1127 | * private inode. This simplifies hugetlbfs_destroy_inode. | |
1128 | */ | |
1129 | mpol_shared_policy_init(&p->policy, NULL); | |
1130 | ||
1da177e4 LT |
1131 | return &p->vfs_inode; |
1132 | } | |
1133 | ||
b62de322 | 1134 | static void hugetlbfs_free_inode(struct inode *inode) |
fa0d7e3d | 1135 | { |
fa0d7e3d NP |
1136 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | static void hugetlbfs_destroy_inode(struct inode *inode) |
1140 | { | |
96527980 | 1141 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 1142 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
1da177e4 LT |
1143 | } |
1144 | ||
f5e54d6e | 1145 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
1146 | .write_begin = hugetlbfs_write_begin, |
1147 | .write_end = hugetlbfs_write_end, | |
46de8b97 | 1148 | .dirty_folio = noop_dirty_folio, |
290408d4 | 1149 | .migratepage = hugetlbfs_migrate_page, |
78bb9203 | 1150 | .error_remove_page = hugetlbfs_error_remove_page, |
1da177e4 LT |
1151 | }; |
1152 | ||
96527980 | 1153 | |
51cc5068 | 1154 | static void init_once(void *foo) |
96527980 CH |
1155 | { |
1156 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; | |
1157 | ||
a35afb83 | 1158 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
1159 | } |
1160 | ||
4b6f5d20 | 1161 | const struct file_operations hugetlbfs_file_operations = { |
34d0640e | 1162 | .read_iter = hugetlbfs_read_iter, |
1da177e4 | 1163 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 1164 | .fsync = noop_fsync, |
1da177e4 | 1165 | .get_unmapped_area = hugetlb_get_unmapped_area, |
70c3547e MK |
1166 | .llseek = default_llseek, |
1167 | .fallocate = hugetlbfs_fallocate, | |
1da177e4 LT |
1168 | }; |
1169 | ||
92e1d5be | 1170 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
1171 | .create = hugetlbfs_create, |
1172 | .lookup = simple_lookup, | |
1173 | .link = simple_link, | |
1174 | .unlink = simple_unlink, | |
1175 | .symlink = hugetlbfs_symlink, | |
1176 | .mkdir = hugetlbfs_mkdir, | |
1177 | .rmdir = simple_rmdir, | |
1178 | .mknod = hugetlbfs_mknod, | |
1179 | .rename = simple_rename, | |
1180 | .setattr = hugetlbfs_setattr, | |
1ab5b82f | 1181 | .tmpfile = hugetlbfs_tmpfile, |
1da177e4 LT |
1182 | }; |
1183 | ||
92e1d5be | 1184 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
1185 | .setattr = hugetlbfs_setattr, |
1186 | }; | |
1187 | ||
ee9b6d61 | 1188 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 | 1189 | .alloc_inode = hugetlbfs_alloc_inode, |
b62de322 | 1190 | .free_inode = hugetlbfs_free_inode, |
1da177e4 | 1191 | .destroy_inode = hugetlbfs_destroy_inode, |
2bbbda30 | 1192 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 1193 | .statfs = hugetlbfs_statfs, |
1da177e4 | 1194 | .put_super = hugetlbfs_put_super, |
4a25220d | 1195 | .show_options = hugetlbfs_show_options, |
1da177e4 LT |
1196 | }; |
1197 | ||
7ca02d0a MK |
1198 | /* |
1199 | * Convert size option passed from command line to number of huge pages | |
1200 | * in the pool specified by hstate. Size option could be in bytes | |
1201 | * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT). | |
1202 | */ | |
4a25220d | 1203 | static long |
7ca02d0a | 1204 | hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt, |
4a25220d | 1205 | enum hugetlbfs_size_type val_type) |
7ca02d0a MK |
1206 | { |
1207 | if (val_type == NO_SIZE) | |
1208 | return -1; | |
1209 | ||
1210 | if (val_type == SIZE_PERCENT) { | |
1211 | size_opt <<= huge_page_shift(h); | |
1212 | size_opt *= h->max_huge_pages; | |
1213 | do_div(size_opt, 100); | |
1214 | } | |
1215 | ||
1216 | size_opt >>= huge_page_shift(h); | |
1217 | return size_opt; | |
1218 | } | |
1219 | ||
32021982 DH |
1220 | /* |
1221 | * Parse one mount parameter. | |
1222 | */ | |
1223 | static int hugetlbfs_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
1da177e4 | 1224 | { |
32021982 DH |
1225 | struct hugetlbfs_fs_context *ctx = fc->fs_private; |
1226 | struct fs_parse_result result; | |
1227 | char *rest; | |
1228 | unsigned long ps; | |
1229 | int opt; | |
1230 | ||
d7167b14 | 1231 | opt = fs_parse(fc, hugetlb_fs_parameters, param, &result); |
32021982 DH |
1232 | if (opt < 0) |
1233 | return opt; | |
1234 | ||
1235 | switch (opt) { | |
1236 | case Opt_uid: | |
1237 | ctx->uid = make_kuid(current_user_ns(), result.uint_32); | |
1238 | if (!uid_valid(ctx->uid)) | |
1239 | goto bad_val; | |
1da177e4 | 1240 | return 0; |
1da177e4 | 1241 | |
32021982 DH |
1242 | case Opt_gid: |
1243 | ctx->gid = make_kgid(current_user_ns(), result.uint_32); | |
1244 | if (!gid_valid(ctx->gid)) | |
1245 | goto bad_val; | |
1246 | return 0; | |
e73a75fa | 1247 | |
32021982 DH |
1248 | case Opt_mode: |
1249 | ctx->mode = result.uint_32 & 01777U; | |
1250 | return 0; | |
e73a75fa | 1251 | |
32021982 DH |
1252 | case Opt_size: |
1253 | /* memparse() will accept a K/M/G without a digit */ | |
1254 | if (!isdigit(param->string[0])) | |
1255 | goto bad_val; | |
1256 | ctx->max_size_opt = memparse(param->string, &rest); | |
1257 | ctx->max_val_type = SIZE_STD; | |
1258 | if (*rest == '%') | |
1259 | ctx->max_val_type = SIZE_PERCENT; | |
1260 | return 0; | |
e73a75fa | 1261 | |
32021982 DH |
1262 | case Opt_nr_inodes: |
1263 | /* memparse() will accept a K/M/G without a digit */ | |
1264 | if (!isdigit(param->string[0])) | |
1265 | goto bad_val; | |
1266 | ctx->nr_inodes = memparse(param->string, &rest); | |
1267 | return 0; | |
e73a75fa | 1268 | |
32021982 DH |
1269 | case Opt_pagesize: |
1270 | ps = memparse(param->string, &rest); | |
1271 | ctx->hstate = size_to_hstate(ps); | |
1272 | if (!ctx->hstate) { | |
1273 | pr_err("Unsupported page size %lu MB\n", ps >> 20); | |
1274 | return -EINVAL; | |
e73a75fa | 1275 | } |
32021982 | 1276 | return 0; |
1da177e4 | 1277 | |
32021982 DH |
1278 | case Opt_min_size: |
1279 | /* memparse() will accept a K/M/G without a digit */ | |
1280 | if (!isdigit(param->string[0])) | |
1281 | goto bad_val; | |
1282 | ctx->min_size_opt = memparse(param->string, &rest); | |
1283 | ctx->min_val_type = SIZE_STD; | |
1284 | if (*rest == '%') | |
1285 | ctx->min_val_type = SIZE_PERCENT; | |
1286 | return 0; | |
e73a75fa | 1287 | |
32021982 DH |
1288 | default: |
1289 | return -EINVAL; | |
1290 | } | |
a137e1cc | 1291 | |
32021982 | 1292 | bad_val: |
b5db30cf | 1293 | return invalfc(fc, "Bad value '%s' for mount option '%s'\n", |
32021982 DH |
1294 | param->string, param->key); |
1295 | } | |
7ca02d0a | 1296 | |
32021982 DH |
1297 | /* |
1298 | * Validate the parsed options. | |
1299 | */ | |
1300 | static int hugetlbfs_validate(struct fs_context *fc) | |
1301 | { | |
1302 | struct hugetlbfs_fs_context *ctx = fc->fs_private; | |
a137e1cc | 1303 | |
7ca02d0a MK |
1304 | /* |
1305 | * Use huge page pool size (in hstate) to convert the size | |
1306 | * options to number of huge pages. If NO_SIZE, -1 is returned. | |
1307 | */ | |
32021982 DH |
1308 | ctx->max_hpages = hugetlbfs_size_to_hpages(ctx->hstate, |
1309 | ctx->max_size_opt, | |
1310 | ctx->max_val_type); | |
1311 | ctx->min_hpages = hugetlbfs_size_to_hpages(ctx->hstate, | |
1312 | ctx->min_size_opt, | |
1313 | ctx->min_val_type); | |
7ca02d0a MK |
1314 | |
1315 | /* | |
1316 | * If max_size was specified, then min_size must be smaller | |
1317 | */ | |
32021982 DH |
1318 | if (ctx->max_val_type > NO_SIZE && |
1319 | ctx->min_hpages > ctx->max_hpages) { | |
1320 | pr_err("Minimum size can not be greater than maximum size\n"); | |
7ca02d0a | 1321 | return -EINVAL; |
a137e1cc AK |
1322 | } |
1323 | ||
1da177e4 LT |
1324 | return 0; |
1325 | } | |
1326 | ||
1327 | static int | |
32021982 | 1328 | hugetlbfs_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 1329 | { |
32021982 | 1330 | struct hugetlbfs_fs_context *ctx = fc->fs_private; |
1da177e4 LT |
1331 | struct hugetlbfs_sb_info *sbinfo; |
1332 | ||
1da177e4 LT |
1333 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
1334 | if (!sbinfo) | |
1335 | return -ENOMEM; | |
1336 | sb->s_fs_info = sbinfo; | |
1337 | spin_lock_init(&sbinfo->stat_lock); | |
32021982 DH |
1338 | sbinfo->hstate = ctx->hstate; |
1339 | sbinfo->max_inodes = ctx->nr_inodes; | |
1340 | sbinfo->free_inodes = ctx->nr_inodes; | |
1341 | sbinfo->spool = NULL; | |
1342 | sbinfo->uid = ctx->uid; | |
1343 | sbinfo->gid = ctx->gid; | |
1344 | sbinfo->mode = ctx->mode; | |
4a25220d | 1345 | |
7ca02d0a MK |
1346 | /* |
1347 | * Allocate and initialize subpool if maximum or minimum size is | |
1935ebd3 | 1348 | * specified. Any needed reservations (for minimum size) are taken |
7ca02d0a MK |
1349 | * taken when the subpool is created. |
1350 | */ | |
32021982 DH |
1351 | if (ctx->max_hpages != -1 || ctx->min_hpages != -1) { |
1352 | sbinfo->spool = hugepage_new_subpool(ctx->hstate, | |
1353 | ctx->max_hpages, | |
1354 | ctx->min_hpages); | |
90481622 DG |
1355 | if (!sbinfo->spool) |
1356 | goto out_free; | |
1357 | } | |
1da177e4 | 1358 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
32021982 DH |
1359 | sb->s_blocksize = huge_page_size(ctx->hstate); |
1360 | sb->s_blocksize_bits = huge_page_shift(ctx->hstate); | |
1da177e4 LT |
1361 | sb->s_magic = HUGETLBFS_MAGIC; |
1362 | sb->s_op = &hugetlbfs_ops; | |
1363 | sb->s_time_gran = 1; | |
15568299 MK |
1364 | |
1365 | /* | |
1366 | * Due to the special and limited functionality of hugetlbfs, it does | |
1367 | * not work well as a stacking filesystem. | |
1368 | */ | |
1369 | sb->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; | |
32021982 | 1370 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, ctx)); |
48fde701 | 1371 | if (!sb->s_root) |
1da177e4 | 1372 | goto out_free; |
1da177e4 LT |
1373 | return 0; |
1374 | out_free: | |
6e6870d4 | 1375 | kfree(sbinfo->spool); |
1da177e4 LT |
1376 | kfree(sbinfo); |
1377 | return -ENOMEM; | |
1378 | } | |
1379 | ||
32021982 DH |
1380 | static int hugetlbfs_get_tree(struct fs_context *fc) |
1381 | { | |
1382 | int err = hugetlbfs_validate(fc); | |
1383 | if (err) | |
1384 | return err; | |
2ac295d4 | 1385 | return get_tree_nodev(fc, hugetlbfs_fill_super); |
32021982 DH |
1386 | } |
1387 | ||
1388 | static void hugetlbfs_fs_context_free(struct fs_context *fc) | |
1389 | { | |
1390 | kfree(fc->fs_private); | |
1391 | } | |
1392 | ||
1393 | static const struct fs_context_operations hugetlbfs_fs_context_ops = { | |
1394 | .free = hugetlbfs_fs_context_free, | |
1395 | .parse_param = hugetlbfs_parse_param, | |
1396 | .get_tree = hugetlbfs_get_tree, | |
1397 | }; | |
1398 | ||
1399 | static int hugetlbfs_init_fs_context(struct fs_context *fc) | |
1da177e4 | 1400 | { |
32021982 DH |
1401 | struct hugetlbfs_fs_context *ctx; |
1402 | ||
1403 | ctx = kzalloc(sizeof(struct hugetlbfs_fs_context), GFP_KERNEL); | |
1404 | if (!ctx) | |
1405 | return -ENOMEM; | |
1406 | ||
1407 | ctx->max_hpages = -1; /* No limit on size by default */ | |
1408 | ctx->nr_inodes = -1; /* No limit on number of inodes by default */ | |
1409 | ctx->uid = current_fsuid(); | |
1410 | ctx->gid = current_fsgid(); | |
1411 | ctx->mode = 0755; | |
1412 | ctx->hstate = &default_hstate; | |
1413 | ctx->min_hpages = -1; /* No default minimum size */ | |
1414 | ctx->max_val_type = NO_SIZE; | |
1415 | ctx->min_val_type = NO_SIZE; | |
1416 | fc->fs_private = ctx; | |
1417 | fc->ops = &hugetlbfs_fs_context_ops; | |
1418 | return 0; | |
1da177e4 LT |
1419 | } |
1420 | ||
1421 | static struct file_system_type hugetlbfs_fs_type = { | |
32021982 DH |
1422 | .name = "hugetlbfs", |
1423 | .init_fs_context = hugetlbfs_init_fs_context, | |
d7167b14 | 1424 | .parameters = hugetlb_fs_parameters, |
32021982 | 1425 | .kill_sb = kill_litter_super, |
1da177e4 LT |
1426 | }; |
1427 | ||
42d7395f | 1428 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
1da177e4 | 1429 | |
ef1ff6b8 | 1430 | static int can_do_hugetlb_shm(void) |
1da177e4 | 1431 | { |
a0eb3a05 EB |
1432 | kgid_t shm_group; |
1433 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); | |
1434 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); | |
1da177e4 LT |
1435 | } |
1436 | ||
42d7395f AK |
1437 | static int get_hstate_idx(int page_size_log) |
1438 | { | |
af73e4d9 | 1439 | struct hstate *h = hstate_sizelog(page_size_log); |
42d7395f | 1440 | |
42d7395f AK |
1441 | if (!h) |
1442 | return -1; | |
04adbc3f | 1443 | return hstate_index(h); |
42d7395f AK |
1444 | } |
1445 | ||
af73e4d9 NH |
1446 | /* |
1447 | * Note that size should be aligned to proper hugepage size in caller side, | |
1448 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. | |
1449 | */ | |
1450 | struct file *hugetlb_file_setup(const char *name, size_t size, | |
83c1fd76 | 1451 | vm_flags_t acctflag, int creat_flags, |
1452 | int page_size_log) | |
1da177e4 | 1453 | { |
1da177e4 | 1454 | struct inode *inode; |
e68375c8 | 1455 | struct vfsmount *mnt; |
42d7395f | 1456 | int hstate_idx; |
e68375c8 | 1457 | struct file *file; |
42d7395f AK |
1458 | |
1459 | hstate_idx = get_hstate_idx(page_size_log); | |
1460 | if (hstate_idx < 0) | |
1461 | return ERR_PTR(-ENODEV); | |
1da177e4 | 1462 | |
e68375c8 AV |
1463 | mnt = hugetlbfs_vfsmount[hstate_idx]; |
1464 | if (!mnt) | |
5bc98594 AM |
1465 | return ERR_PTR(-ENOENT); |
1466 | ||
ef1ff6b8 | 1467 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
83c1fd76 | 1468 | struct ucounts *ucounts = current_ucounts(); |
1469 | ||
1470 | if (user_shm_lock(size, ucounts)) { | |
1471 | pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is obsolete\n", | |
21a3c273 | 1472 | current->comm, current->pid); |
83c1fd76 | 1473 | user_shm_unlock(size, ucounts); |
353d5c30 | 1474 | } |
83c1fd76 | 1475 | return ERR_PTR(-EPERM); |
2584e517 | 1476 | } |
1da177e4 | 1477 | |
39b65252 | 1478 | file = ERR_PTR(-ENOSPC); |
e68375c8 | 1479 | inode = hugetlbfs_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 1480 | if (!inode) |
e68375c8 | 1481 | goto out; |
e1832f29 SS |
1482 | if (creat_flags == HUGETLB_SHMFS_INODE) |
1483 | inode->i_flags |= S_PRIVATE; | |
1da177e4 | 1484 | |
1da177e4 | 1485 | inode->i_size = size; |
6d6b77f1 | 1486 | clear_nlink(inode); |
ce8d2cdf | 1487 | |
33b8f84a | 1488 | if (!hugetlb_reserve_pages(inode, 0, |
e68375c8 AV |
1489 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
1490 | acctflag)) | |
1491 | file = ERR_PTR(-ENOMEM); | |
1492 | else | |
1493 | file = alloc_file_pseudo(inode, mnt, name, O_RDWR, | |
1494 | &hugetlbfs_file_operations); | |
1495 | if (!IS_ERR(file)) | |
1496 | return file; | |
1da177e4 | 1497 | |
b45b5bd6 | 1498 | iput(inode); |
e68375c8 | 1499 | out: |
39b65252 | 1500 | return file; |
1da177e4 LT |
1501 | } |
1502 | ||
32021982 DH |
1503 | static struct vfsmount *__init mount_one_hugetlbfs(struct hstate *h) |
1504 | { | |
1505 | struct fs_context *fc; | |
1506 | struct vfsmount *mnt; | |
1507 | ||
1508 | fc = fs_context_for_mount(&hugetlbfs_fs_type, SB_KERNMOUNT); | |
1509 | if (IS_ERR(fc)) { | |
1510 | mnt = ERR_CAST(fc); | |
1511 | } else { | |
1512 | struct hugetlbfs_fs_context *ctx = fc->fs_private; | |
1513 | ctx->hstate = h; | |
1514 | mnt = fc_mount(fc); | |
1515 | put_fs_context(fc); | |
1516 | } | |
1517 | if (IS_ERR(mnt)) | |
a25fddce ML |
1518 | pr_err("Cannot mount internal hugetlbfs for page size %luK", |
1519 | huge_page_size(h) >> 10); | |
32021982 DH |
1520 | return mnt; |
1521 | } | |
1522 | ||
1da177e4 LT |
1523 | static int __init init_hugetlbfs_fs(void) |
1524 | { | |
32021982 | 1525 | struct vfsmount *mnt; |
42d7395f | 1526 | struct hstate *h; |
1da177e4 | 1527 | int error; |
42d7395f | 1528 | int i; |
1da177e4 | 1529 | |
457c1b27 | 1530 | if (!hugepages_supported()) { |
9b857d26 | 1531 | pr_info("disabling because there are no supported hugepage sizes\n"); |
457c1b27 NA |
1532 | return -ENOTSUPP; |
1533 | } | |
1534 | ||
d1d5e05f | 1535 | error = -ENOMEM; |
1da177e4 LT |
1536 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1537 | sizeof(struct hugetlbfs_inode_info), | |
5d097056 | 1538 | 0, SLAB_ACCOUNT, init_once); |
1da177e4 | 1539 | if (hugetlbfs_inode_cachep == NULL) |
8fc312b3 | 1540 | goto out; |
1da177e4 LT |
1541 | |
1542 | error = register_filesystem(&hugetlbfs_fs_type); | |
1543 | if (error) | |
8fc312b3 | 1544 | goto out_free; |
1da177e4 | 1545 | |
8fc312b3 | 1546 | /* default hstate mount is required */ |
3b2275a8 | 1547 | mnt = mount_one_hugetlbfs(&default_hstate); |
8fc312b3 MK |
1548 | if (IS_ERR(mnt)) { |
1549 | error = PTR_ERR(mnt); | |
1550 | goto out_unreg; | |
1551 | } | |
1552 | hugetlbfs_vfsmount[default_hstate_idx] = mnt; | |
1553 | ||
1554 | /* other hstates are optional */ | |
42d7395f AK |
1555 | i = 0; |
1556 | for_each_hstate(h) { | |
15f0ec94 JS |
1557 | if (i == default_hstate_idx) { |
1558 | i++; | |
8fc312b3 | 1559 | continue; |
15f0ec94 | 1560 | } |
8fc312b3 | 1561 | |
32021982 | 1562 | mnt = mount_one_hugetlbfs(h); |
8fc312b3 MK |
1563 | if (IS_ERR(mnt)) |
1564 | hugetlbfs_vfsmount[i] = NULL; | |
1565 | else | |
1566 | hugetlbfs_vfsmount[i] = mnt; | |
42d7395f AK |
1567 | i++; |
1568 | } | |
32021982 DH |
1569 | |
1570 | return 0; | |
1da177e4 | 1571 | |
8fc312b3 MK |
1572 | out_unreg: |
1573 | (void)unregister_filesystem(&hugetlbfs_fs_type); | |
1574 | out_free: | |
d1d5e05f | 1575 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
8fc312b3 | 1576 | out: |
1da177e4 LT |
1577 | return error; |
1578 | } | |
3e89e1c5 | 1579 | fs_initcall(init_hugetlbfs_fs) |