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> | |
70c3547e | 14 | #include <linux/falloc.h> |
1da177e4 LT |
15 | #include <linux/fs.h> |
16 | #include <linux/mount.h> | |
17 | #include <linux/file.h> | |
e73a75fa | 18 | #include <linux/kernel.h> |
1da177e4 LT |
19 | #include <linux/writeback.h> |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/string.h> | |
16f7e0fe | 24 | #include <linux/capability.h> |
e73a75fa | 25 | #include <linux/ctype.h> |
1da177e4 LT |
26 | #include <linux/backing-dev.h> |
27 | #include <linux/hugetlb.h> | |
28 | #include <linux/pagevec.h> | |
32021982 | 29 | #include <linux/fs_parser.h> |
036e0856 | 30 | #include <linux/mman.h> |
1da177e4 LT |
31 | #include <linux/slab.h> |
32 | #include <linux/dnotify.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/security.h> | |
1fd7317d | 35 | #include <linux/magic.h> |
290408d4 | 36 | #include <linux/migrate.h> |
34d0640e | 37 | #include <linux/uio.h> |
1da177e4 | 38 | |
7c0f6ba6 | 39 | #include <linux/uaccess.h> |
88590253 | 40 | #include <linux/sched/mm.h> |
1da177e4 | 41 | |
f5e54d6e | 42 | static const struct address_space_operations hugetlbfs_aops; |
4b6f5d20 | 43 | const struct file_operations hugetlbfs_file_operations; |
92e1d5be AV |
44 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
45 | static const struct inode_operations hugetlbfs_inode_operations; | |
1da177e4 | 46 | |
32021982 DH |
47 | enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT }; |
48 | ||
49 | struct hugetlbfs_fs_context { | |
4a25220d | 50 | struct hstate *hstate; |
32021982 DH |
51 | unsigned long long max_size_opt; |
52 | unsigned long long min_size_opt; | |
4a25220d DH |
53 | long max_hpages; |
54 | long nr_inodes; | |
55 | long min_hpages; | |
32021982 DH |
56 | enum hugetlbfs_size_type max_val_type; |
57 | enum hugetlbfs_size_type min_val_type; | |
4a25220d DH |
58 | kuid_t uid; |
59 | kgid_t gid; | |
60 | umode_t mode; | |
a1d776ee DG |
61 | }; |
62 | ||
1da177e4 LT |
63 | int sysctl_hugetlb_shm_group; |
64 | ||
32021982 DH |
65 | enum hugetlb_param { |
66 | Opt_gid, | |
67 | Opt_min_size, | |
68 | Opt_mode, | |
69 | Opt_nr_inodes, | |
70 | Opt_pagesize, | |
71 | Opt_size, | |
72 | Opt_uid, | |
e73a75fa RD |
73 | }; |
74 | ||
d7167b14 | 75 | static const struct fs_parameter_spec hugetlb_fs_parameters[] = { |
32021982 DH |
76 | fsparam_u32 ("gid", Opt_gid), |
77 | fsparam_string("min_size", Opt_min_size), | |
e0f7e2b2 | 78 | fsparam_u32oct("mode", Opt_mode), |
32021982 DH |
79 | fsparam_string("nr_inodes", Opt_nr_inodes), |
80 | fsparam_string("pagesize", Opt_pagesize), | |
81 | fsparam_string("size", Opt_size), | |
82 | fsparam_u32 ("uid", Opt_uid), | |
83 | {} | |
84 | }; | |
85 | ||
70c3547e MK |
86 | #ifdef CONFIG_NUMA |
87 | static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, | |
88 | struct inode *inode, pgoff_t index) | |
89 | { | |
90 | vma->vm_policy = mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy, | |
91 | index); | |
92 | } | |
93 | ||
94 | static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) | |
95 | { | |
96 | mpol_cond_put(vma->vm_policy); | |
97 | } | |
98 | #else | |
99 | static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, | |
100 | struct inode *inode, pgoff_t index) | |
101 | { | |
102 | } | |
103 | ||
104 | static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) | |
105 | { | |
106 | } | |
107 | #endif | |
108 | ||
63489f8e MK |
109 | /* |
110 | * Mask used when checking the page offset value passed in via system | |
111 | * calls. This value will be converted to a loff_t which is signed. | |
112 | * Therefore, we want to check the upper PAGE_SHIFT + 1 bits of the | |
113 | * value. The extra bit (- 1 in the shift value) is to take the sign | |
114 | * bit into account. | |
115 | */ | |
116 | #define PGOFF_LOFFT_MAX \ | |
117 | (((1UL << (PAGE_SHIFT + 1)) - 1) << (BITS_PER_LONG - (PAGE_SHIFT + 1))) | |
118 | ||
1da177e4 LT |
119 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
120 | { | |
496ad9aa | 121 | struct inode *inode = file_inode(file); |
22247efd | 122 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
1da177e4 LT |
123 | loff_t len, vma_len; |
124 | int ret; | |
a5516438 | 125 | struct hstate *h = hstate_file(file); |
1da177e4 | 126 | |
68589bc3 | 127 | /* |
dec4ad86 DG |
128 | * vma address alignment (but not the pgoff alignment) has |
129 | * already been checked by prepare_hugepage_range. If you add | |
130 | * any error returns here, do so after setting VM_HUGETLB, so | |
131 | * is_vm_hugetlb_page tests below unmap_region go the right | |
45e55300 | 132 | * way when do_mmap unwinds (may be important on powerpc |
dec4ad86 | 133 | * and ia64). |
68589bc3 | 134 | */ |
1c71222e | 135 | vm_flags_set(vma, VM_HUGETLB | VM_DONTEXPAND); |
68589bc3 | 136 | vma->vm_ops = &hugetlb_vm_ops; |
1da177e4 | 137 | |
22247efd PX |
138 | ret = seal_check_future_write(info->seals, vma); |
139 | if (ret) | |
140 | return ret; | |
141 | ||
045c7a3f | 142 | /* |
63489f8e | 143 | * page based offset in vm_pgoff could be sufficiently large to |
5df63c2a MK |
144 | * overflow a loff_t when converted to byte offset. This can |
145 | * only happen on architectures where sizeof(loff_t) == | |
146 | * sizeof(unsigned long). So, only check in those instances. | |
045c7a3f | 147 | */ |
5df63c2a MK |
148 | if (sizeof(unsigned long) == sizeof(loff_t)) { |
149 | if (vma->vm_pgoff & PGOFF_LOFFT_MAX) | |
150 | return -EINVAL; | |
151 | } | |
045c7a3f | 152 | |
63489f8e | 153 | /* must be huge page aligned */ |
2b37c35e | 154 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
dec4ad86 DG |
155 | return -EINVAL; |
156 | ||
1da177e4 | 157 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
045c7a3f MK |
158 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
159 | /* check for overflow */ | |
160 | if (len < vma_len) | |
161 | return -EINVAL; | |
1da177e4 | 162 | |
5955102c | 163 | inode_lock(inode); |
1da177e4 | 164 | file_accessed(file); |
1da177e4 LT |
165 | |
166 | ret = -ENOMEM; | |
33b8f84a | 167 | if (!hugetlb_reserve_pages(inode, |
a5516438 | 168 | vma->vm_pgoff >> huge_page_order(h), |
5a6fe125 MG |
169 | len >> huge_page_shift(h), vma, |
170 | vma->vm_flags)) | |
a43a8c39 | 171 | goto out; |
b45b5bd6 | 172 | |
4c887265 | 173 | ret = 0; |
b6174df5 | 174 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
045c7a3f | 175 | i_size_write(inode, len); |
1da177e4 | 176 | out: |
5955102c | 177 | inode_unlock(inode); |
1da177e4 LT |
178 | |
179 | return ret; | |
180 | } | |
181 | ||
182 | /* | |
3e4e28c5 | 183 | * Called under mmap_write_lock(mm). |
1da177e4 LT |
184 | */ |
185 | ||
88590253 SH |
186 | static unsigned long |
187 | hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr, | |
188 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
189 | { | |
190 | struct hstate *h = hstate_file(file); | |
191 | struct vm_unmapped_area_info info; | |
192 | ||
193 | info.flags = 0; | |
194 | info.length = len; | |
195 | info.low_limit = current->mm->mmap_base; | |
2cb4de08 | 196 | info.high_limit = arch_get_mmap_end(addr, len, flags); |
88590253 SH |
197 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
198 | info.align_offset = 0; | |
199 | return vm_unmapped_area(&info); | |
200 | } | |
201 | ||
202 | static unsigned long | |
203 | hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr, | |
204 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
205 | { | |
206 | struct hstate *h = hstate_file(file); | |
207 | struct vm_unmapped_area_info info; | |
208 | ||
209 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
210 | info.length = len; | |
6b008640 | 211 | info.low_limit = PAGE_SIZE; |
5f24d5a5 | 212 | info.high_limit = arch_get_mmap_base(addr, current->mm->mmap_base); |
88590253 SH |
213 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
214 | info.align_offset = 0; | |
215 | addr = vm_unmapped_area(&info); | |
216 | ||
217 | /* | |
218 | * A failed mmap() very likely causes application failure, | |
219 | * so fall back to the bottom-up function here. This scenario | |
220 | * can happen with large stack limits and large mmap() | |
221 | * allocations. | |
222 | */ | |
223 | if (unlikely(offset_in_page(addr))) { | |
224 | VM_BUG_ON(addr != -ENOMEM); | |
225 | info.flags = 0; | |
226 | info.low_limit = current->mm->mmap_base; | |
2cb4de08 | 227 | info.high_limit = arch_get_mmap_end(addr, len, flags); |
88590253 SH |
228 | addr = vm_unmapped_area(&info); |
229 | } | |
230 | ||
231 | return addr; | |
232 | } | |
233 | ||
4b439e25 CL |
234 | unsigned long |
235 | generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
236 | unsigned long len, unsigned long pgoff, | |
237 | unsigned long flags) | |
1da177e4 LT |
238 | { |
239 | struct mm_struct *mm = current->mm; | |
240 | struct vm_area_struct *vma; | |
a5516438 | 241 | struct hstate *h = hstate_file(file); |
2cb4de08 | 242 | const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); |
1da177e4 | 243 | |
a5516438 | 244 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
245 | return -EINVAL; |
246 | if (len > TASK_SIZE) | |
247 | return -ENOMEM; | |
248 | ||
036e0856 | 249 | if (flags & MAP_FIXED) { |
a5516438 | 250 | if (prepare_hugepage_range(file, addr, len)) |
036e0856 BH |
251 | return -EINVAL; |
252 | return addr; | |
253 | } | |
254 | ||
1da177e4 | 255 | if (addr) { |
a5516438 | 256 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 | 257 | vma = find_vma(mm, addr); |
5f24d5a5 | 258 | if (mmap_end - len >= addr && |
1be7107f | 259 | (!vma || addr + len <= vm_start_gap(vma))) |
1da177e4 LT |
260 | return addr; |
261 | } | |
262 | ||
88590253 SH |
263 | /* |
264 | * Use mm->get_unmapped_area value as a hint to use topdown routine. | |
265 | * If architectures have special needs, they should define their own | |
266 | * version of hugetlb_get_unmapped_area. | |
267 | */ | |
268 | if (mm->get_unmapped_area == arch_get_unmapped_area_topdown) | |
269 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |
270 | pgoff, flags); | |
271 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |
272 | pgoff, flags); | |
1da177e4 | 273 | } |
4b439e25 CL |
274 | |
275 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA | |
276 | static unsigned long | |
277 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
278 | unsigned long len, unsigned long pgoff, | |
279 | unsigned long flags) | |
280 | { | |
281 | return generic_hugetlb_get_unmapped_area(file, addr, len, pgoff, flags); | |
282 | } | |
1da177e4 LT |
283 | #endif |
284 | ||
e63e1e5a BP |
285 | /* |
286 | * Support for read() - Find the page attached to f_mapping and copy out the | |
445c8098 | 287 | * data. This provides functionality similar to filemap_read(). |
e63e1e5a | 288 | */ |
34d0640e | 289 | static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) |
e63e1e5a | 290 | { |
34d0640e AV |
291 | struct file *file = iocb->ki_filp; |
292 | struct hstate *h = hstate_file(file); | |
293 | struct address_space *mapping = file->f_mapping; | |
e63e1e5a | 294 | struct inode *inode = mapping->host; |
34d0640e AV |
295 | unsigned long index = iocb->ki_pos >> huge_page_shift(h); |
296 | unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); | |
e63e1e5a BP |
297 | unsigned long end_index; |
298 | loff_t isize; | |
299 | ssize_t retval = 0; | |
300 | ||
34d0640e | 301 | while (iov_iter_count(to)) { |
e63e1e5a | 302 | struct page *page; |
34d0640e | 303 | size_t nr, copied; |
e63e1e5a BP |
304 | |
305 | /* nr is the maximum number of bytes to copy from this page */ | |
a5516438 | 306 | nr = huge_page_size(h); |
a05b0855 AK |
307 | isize = i_size_read(inode); |
308 | if (!isize) | |
34d0640e | 309 | break; |
a05b0855 | 310 | end_index = (isize - 1) >> huge_page_shift(h); |
34d0640e AV |
311 | if (index > end_index) |
312 | break; | |
313 | if (index == end_index) { | |
a5516438 | 314 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
a05b0855 | 315 | if (nr <= offset) |
34d0640e | 316 | break; |
e63e1e5a BP |
317 | } |
318 | nr = nr - offset; | |
319 | ||
320 | /* Find the page */ | |
a05b0855 | 321 | page = find_lock_page(mapping, index); |
e63e1e5a BP |
322 | if (unlikely(page == NULL)) { |
323 | /* | |
324 | * We have a HOLE, zero out the user-buffer for the | |
325 | * length of the hole or request. | |
326 | */ | |
34d0640e | 327 | copied = iov_iter_zero(nr, to); |
e63e1e5a | 328 | } else { |
a05b0855 AK |
329 | unlock_page(page); |
330 | ||
8625147c JH |
331 | if (PageHWPoison(page)) { |
332 | put_page(page); | |
333 | retval = -EIO; | |
334 | break; | |
335 | } | |
336 | ||
e63e1e5a BP |
337 | /* |
338 | * We have the page, copy it to user space buffer. | |
339 | */ | |
c7d57ab1 | 340 | copied = copy_page_to_iter(page, offset, nr, to); |
09cbfeaf | 341 | put_page(page); |
e63e1e5a | 342 | } |
34d0640e AV |
343 | offset += copied; |
344 | retval += copied; | |
345 | if (copied != nr && iov_iter_count(to)) { | |
346 | if (!retval) | |
347 | retval = -EFAULT; | |
348 | break; | |
e63e1e5a | 349 | } |
a5516438 AK |
350 | index += offset >> huge_page_shift(h); |
351 | offset &= ~huge_page_mask(h); | |
e63e1e5a | 352 | } |
34d0640e | 353 | iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; |
e63e1e5a BP |
354 | return retval; |
355 | } | |
356 | ||
800d15a5 NP |
357 | static int hugetlbfs_write_begin(struct file *file, |
358 | struct address_space *mapping, | |
9d6b0cd7 | 359 | loff_t pos, unsigned len, |
800d15a5 | 360 | struct page **pagep, void **fsdata) |
1da177e4 LT |
361 | { |
362 | return -EINVAL; | |
363 | } | |
364 | ||
800d15a5 NP |
365 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
366 | loff_t pos, unsigned len, unsigned copied, | |
367 | struct page *page, void *fsdata) | |
1da177e4 | 368 | { |
800d15a5 | 369 | BUG(); |
1da177e4 LT |
370 | return -EINVAL; |
371 | } | |
372 | ||
ece62684 | 373 | static void hugetlb_delete_from_page_cache(struct folio *folio) |
1da177e4 | 374 | { |
ece62684 SK |
375 | folio_clear_dirty(folio); |
376 | folio_clear_uptodate(folio); | |
377 | filemap_remove_folio(folio); | |
1da177e4 LT |
378 | } |
379 | ||
378397cc MK |
380 | /* |
381 | * Called with i_mmap_rwsem held for inode based vma maps. This makes | |
382 | * sure vma (and vm_mm) will not go away. We also hold the hugetlb fault | |
383 | * mutex for the page in the mapping. So, we can not race with page being | |
384 | * faulted into the vma. | |
385 | */ | |
386 | static bool hugetlb_vma_maps_page(struct vm_area_struct *vma, | |
387 | unsigned long addr, struct page *page) | |
388 | { | |
389 | pte_t *ptep, pte; | |
390 | ||
9c67a207 | 391 | ptep = hugetlb_walk(vma, addr, huge_page_size(hstate_vma(vma))); |
378397cc MK |
392 | if (!ptep) |
393 | return false; | |
394 | ||
395 | pte = huge_ptep_get(ptep); | |
396 | if (huge_pte_none(pte) || !pte_present(pte)) | |
397 | return false; | |
398 | ||
399 | if (pte_page(pte) == page) | |
400 | return true; | |
401 | ||
402 | return false; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Can vma_offset_start/vma_offset_end overflow on 32-bit arches? | |
407 | * No, because the interval tree returns us only those vmas | |
408 | * which overlap the truncated area starting at pgoff, | |
409 | * and no vma on a 32-bit arch can span beyond the 4GB. | |
410 | */ | |
411 | static unsigned long vma_offset_start(struct vm_area_struct *vma, pgoff_t start) | |
412 | { | |
243b1f2d PX |
413 | unsigned long offset = 0; |
414 | ||
378397cc | 415 | if (vma->vm_pgoff < start) |
243b1f2d PX |
416 | offset = (start - vma->vm_pgoff) << PAGE_SHIFT; |
417 | ||
418 | return vma->vm_start + offset; | |
378397cc MK |
419 | } |
420 | ||
421 | static unsigned long vma_offset_end(struct vm_area_struct *vma, pgoff_t end) | |
422 | { | |
423 | unsigned long t_end; | |
424 | ||
425 | if (!end) | |
426 | return vma->vm_end; | |
427 | ||
428 | t_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) + vma->vm_start; | |
429 | if (t_end > vma->vm_end) | |
430 | t_end = vma->vm_end; | |
431 | return t_end; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Called with hugetlb fault mutex held. Therefore, no more mappings to | |
436 | * this folio can be created while executing the routine. | |
437 | */ | |
438 | static void hugetlb_unmap_file_folio(struct hstate *h, | |
439 | struct address_space *mapping, | |
440 | struct folio *folio, pgoff_t index) | |
441 | { | |
442 | struct rb_root_cached *root = &mapping->i_mmap; | |
40549ba8 | 443 | struct hugetlb_vma_lock *vma_lock; |
378397cc MK |
444 | struct page *page = &folio->page; |
445 | struct vm_area_struct *vma; | |
446 | unsigned long v_start; | |
447 | unsigned long v_end; | |
448 | pgoff_t start, end; | |
449 | ||
450 | start = index * pages_per_huge_page(h); | |
451 | end = (index + 1) * pages_per_huge_page(h); | |
452 | ||
453 | i_mmap_lock_write(mapping); | |
40549ba8 MK |
454 | retry: |
455 | vma_lock = NULL; | |
378397cc MK |
456 | vma_interval_tree_foreach(vma, root, start, end - 1) { |
457 | v_start = vma_offset_start(vma, start); | |
458 | v_end = vma_offset_end(vma, end); | |
459 | ||
243b1f2d | 460 | if (!hugetlb_vma_maps_page(vma, v_start, page)) |
378397cc MK |
461 | continue; |
462 | ||
40549ba8 MK |
463 | if (!hugetlb_vma_trylock_write(vma)) { |
464 | vma_lock = vma->vm_private_data; | |
465 | /* | |
466 | * If we can not get vma lock, we need to drop | |
467 | * immap_sema and take locks in order. First, | |
468 | * take a ref on the vma_lock structure so that | |
469 | * we can be guaranteed it will not go away when | |
470 | * dropping immap_sema. | |
471 | */ | |
472 | kref_get(&vma_lock->refs); | |
473 | break; | |
474 | } | |
475 | ||
243b1f2d PX |
476 | unmap_hugepage_range(vma, v_start, v_end, NULL, |
477 | ZAP_FLAG_DROP_MARKER); | |
40549ba8 | 478 | hugetlb_vma_unlock_write(vma); |
378397cc MK |
479 | } |
480 | ||
481 | i_mmap_unlock_write(mapping); | |
40549ba8 MK |
482 | |
483 | if (vma_lock) { | |
484 | /* | |
485 | * Wait on vma_lock. We know it is still valid as we have | |
486 | * a reference. We must 'open code' vma locking as we do | |
487 | * not know if vma_lock is still attached to vma. | |
488 | */ | |
489 | down_write(&vma_lock->rw_sema); | |
490 | i_mmap_lock_write(mapping); | |
491 | ||
492 | vma = vma_lock->vma; | |
493 | if (!vma) { | |
494 | /* | |
495 | * If lock is no longer attached to vma, then just | |
496 | * unlock, drop our reference and retry looking for | |
497 | * other vmas. | |
498 | */ | |
499 | up_write(&vma_lock->rw_sema); | |
500 | kref_put(&vma_lock->refs, hugetlb_vma_lock_release); | |
501 | goto retry; | |
502 | } | |
503 | ||
504 | /* | |
505 | * vma_lock is still attached to vma. Check to see if vma | |
506 | * still maps page and if so, unmap. | |
507 | */ | |
508 | v_start = vma_offset_start(vma, start); | |
509 | v_end = vma_offset_end(vma, end); | |
243b1f2d PX |
510 | if (hugetlb_vma_maps_page(vma, v_start, page)) |
511 | unmap_hugepage_range(vma, v_start, v_end, NULL, | |
512 | ZAP_FLAG_DROP_MARKER); | |
40549ba8 MK |
513 | |
514 | kref_put(&vma_lock->refs, hugetlb_vma_lock_release); | |
515 | hugetlb_vma_unlock_write(vma); | |
516 | ||
517 | goto retry; | |
518 | } | |
378397cc MK |
519 | } |
520 | ||
4aae8d1c | 521 | static void |
05e90bd0 PX |
522 | hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end, |
523 | zap_flags_t zap_flags) | |
4aae8d1c MK |
524 | { |
525 | struct vm_area_struct *vma; | |
526 | ||
527 | /* | |
d6aba4c8 SC |
528 | * end == 0 indicates that the entire range after start should be |
529 | * unmapped. Note, end is exclusive, whereas the interval tree takes | |
530 | * an inclusive "last". | |
4aae8d1c | 531 | */ |
d6aba4c8 | 532 | vma_interval_tree_foreach(vma, root, start, end ? end - 1 : ULONG_MAX) { |
378397cc | 533 | unsigned long v_start; |
4aae8d1c MK |
534 | unsigned long v_end; |
535 | ||
40549ba8 MK |
536 | if (!hugetlb_vma_trylock_write(vma)) |
537 | continue; | |
538 | ||
378397cc MK |
539 | v_start = vma_offset_start(vma, start); |
540 | v_end = vma_offset_end(vma, end); | |
4aae8d1c | 541 | |
243b1f2d | 542 | unmap_hugepage_range(vma, v_start, v_end, NULL, zap_flags); |
40549ba8 MK |
543 | |
544 | /* | |
545 | * Note that vma lock only exists for shared/non-private | |
546 | * vmas. Therefore, lock is not held when calling | |
547 | * unmap_hugepage_range for private vmas. | |
548 | */ | |
549 | hugetlb_vma_unlock_write(vma); | |
4aae8d1c MK |
550 | } |
551 | } | |
b5cec28d | 552 | |
c8627228 MK |
553 | /* |
554 | * Called with hugetlb fault mutex held. | |
555 | * Returns true if page was actually removed, false otherwise. | |
556 | */ | |
557 | static bool remove_inode_single_folio(struct hstate *h, struct inode *inode, | |
558 | struct address_space *mapping, | |
559 | struct folio *folio, pgoff_t index, | |
560 | bool truncate_op) | |
561 | { | |
562 | bool ret = false; | |
563 | ||
564 | /* | |
565 | * If folio is mapped, it was faulted in after being | |
566 | * unmapped in caller. Unmap (again) while holding | |
567 | * the fault mutex. The mutex will prevent faults | |
568 | * until we finish removing the folio. | |
569 | */ | |
378397cc MK |
570 | if (unlikely(folio_mapped(folio))) |
571 | hugetlb_unmap_file_folio(h, mapping, folio, index); | |
c8627228 MK |
572 | |
573 | folio_lock(folio); | |
574 | /* | |
fa27759a MK |
575 | * We must remove the folio from page cache before removing |
576 | * the region/ reserve map (hugetlb_unreserve_pages). In | |
577 | * rare out of memory conditions, removal of the region/reserve | |
578 | * map could fail. Correspondingly, the subpool and global | |
579 | * reserve usage count can need to be adjusted. | |
c8627228 | 580 | */ |
ece62684 SK |
581 | VM_BUG_ON_FOLIO(folio_test_hugetlb_restore_reserve(folio), folio); |
582 | hugetlb_delete_from_page_cache(folio); | |
fa27759a MK |
583 | ret = true; |
584 | if (!truncate_op) { | |
585 | if (unlikely(hugetlb_unreserve_pages(inode, index, | |
586 | index + 1, 1))) | |
587 | hugetlb_fix_reserve_counts(inode); | |
c8627228 MK |
588 | } |
589 | ||
590 | folio_unlock(folio); | |
591 | return ret; | |
592 | } | |
593 | ||
b5cec28d MK |
594 | /* |
595 | * remove_inode_hugepages handles two distinct cases: truncation and hole | |
596 | * punch. There are subtle differences in operation for each case. | |
4aae8d1c | 597 | * |
b5cec28d MK |
598 | * truncation is indicated by end of range being LLONG_MAX |
599 | * In this case, we first scan the range and release found pages. | |
1935ebd3 | 600 | * After releasing pages, hugetlb_unreserve_pages cleans up region/reserve |
c8627228 MK |
601 | * maps and global counts. Page faults can race with truncation. |
602 | * During faults, hugetlb_no_page() checks i_size before page allocation, | |
603 | * and again after obtaining page table lock. It will 'back out' | |
604 | * allocations in the truncated range. | |
b5cec28d MK |
605 | * hole punch is indicated if end is not LLONG_MAX |
606 | * In the hole punch case we scan the range and release found pages. | |
1935ebd3 ML |
607 | * Only when releasing a page is the associated region/reserve map |
608 | * deleted. The region/reserve map for ranges without associated | |
e7c58097 MK |
609 | * pages are not modified. Page faults can race with hole punch. |
610 | * This is indicated if we find a mapped page. | |
b5cec28d MK |
611 | * Note: If the passed end of range value is beyond the end of file, but |
612 | * not LLONG_MAX this routine still performs a hole punch operation. | |
613 | */ | |
614 | static void remove_inode_hugepages(struct inode *inode, loff_t lstart, | |
615 | loff_t lend) | |
1da177e4 | 616 | { |
a5516438 | 617 | struct hstate *h = hstate_inode(inode); |
b45b5bd6 | 618 | struct address_space *mapping = &inode->i_data; |
a5516438 | 619 | const pgoff_t start = lstart >> huge_page_shift(h); |
b5cec28d | 620 | const pgoff_t end = lend >> huge_page_shift(h); |
1508062e | 621 | struct folio_batch fbatch; |
d72dc8a2 | 622 | pgoff_t next, index; |
a43a8c39 | 623 | int i, freed = 0; |
b5cec28d | 624 | bool truncate_op = (lend == LLONG_MAX); |
1da177e4 | 625 | |
1508062e | 626 | folio_batch_init(&fbatch); |
1da177e4 | 627 | next = start; |
1508062e MWO |
628 | while (filemap_get_folios(mapping, &next, end - 1, &fbatch)) { |
629 | for (i = 0; i < folio_batch_count(&fbatch); ++i) { | |
630 | struct folio *folio = fbatch.folios[i]; | |
d4241a04 | 631 | u32 hash = 0; |
b5cec28d | 632 | |
1508062e | 633 | index = folio->index; |
188a3972 MK |
634 | hash = hugetlb_fault_mutex_hash(mapping, index); |
635 | mutex_lock(&hugetlb_fault_mutex_table[hash]); | |
e7c58097 | 636 | |
4aae8d1c | 637 | /* |
c8627228 | 638 | * Remove folio that was part of folio_batch. |
4aae8d1c | 639 | */ |
c8627228 MK |
640 | if (remove_inode_single_folio(h, inode, mapping, folio, |
641 | index, truncate_op)) | |
642 | freed++; | |
643 | ||
188a3972 | 644 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
1da177e4 | 645 | } |
1508062e | 646 | folio_batch_release(&fbatch); |
1817889e | 647 | cond_resched(); |
1da177e4 | 648 | } |
b5cec28d MK |
649 | |
650 | if (truncate_op) | |
651 | (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); | |
1da177e4 LT |
652 | } |
653 | ||
2bbbda30 | 654 | static void hugetlbfs_evict_inode(struct inode *inode) |
1da177e4 | 655 | { |
9119a41e JK |
656 | struct resv_map *resv_map; |
657 | ||
b5cec28d | 658 | remove_inode_hugepages(inode, 0, LLONG_MAX); |
f27a5136 MK |
659 | |
660 | /* | |
661 | * Get the resv_map from the address space embedded in the inode. | |
662 | * This is the address space which points to any resv_map allocated | |
663 | * at inode creation time. If this is a device special inode, | |
664 | * i_mapping may not point to the original address space. | |
665 | */ | |
666 | resv_map = (struct resv_map *)(&inode->i_data)->private_data; | |
667 | /* Only regular and link inodes have associated reserve maps */ | |
9119a41e JK |
668 | if (resv_map) |
669 | resv_map_release(&resv_map->refs); | |
dbd5768f | 670 | clear_inode(inode); |
149f4211 CH |
671 | } |
672 | ||
e5d319de | 673 | static void hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
1da177e4 | 674 | { |
856fc295 | 675 | pgoff_t pgoff; |
1da177e4 | 676 | struct address_space *mapping = inode->i_mapping; |
a5516438 | 677 | struct hstate *h = hstate_inode(inode); |
1da177e4 | 678 | |
a5516438 | 679 | BUG_ON(offset & ~huge_page_mask(h)); |
856fc295 | 680 | pgoff = offset >> PAGE_SHIFT; |
1da177e4 | 681 | |
87bf91d3 | 682 | i_size_write(inode, offset); |
188a3972 | 683 | i_mmap_lock_write(mapping); |
f808c13f | 684 | if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) |
05e90bd0 PX |
685 | hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0, |
686 | ZAP_FLAG_DROP_MARKER); | |
c86aa7bb | 687 | i_mmap_unlock_write(mapping); |
e7c58097 | 688 | remove_inode_hugepages(inode, offset, LLONG_MAX); |
1da177e4 LT |
689 | } |
690 | ||
68d32527 MK |
691 | static void hugetlbfs_zero_partial_page(struct hstate *h, |
692 | struct address_space *mapping, | |
693 | loff_t start, | |
694 | loff_t end) | |
695 | { | |
696 | pgoff_t idx = start >> huge_page_shift(h); | |
697 | struct folio *folio; | |
698 | ||
699 | folio = filemap_lock_folio(mapping, idx); | |
66dabbb6 | 700 | if (IS_ERR(folio)) |
68d32527 MK |
701 | return; |
702 | ||
703 | start = start & ~huge_page_mask(h); | |
704 | end = end & ~huge_page_mask(h); | |
705 | if (!end) | |
706 | end = huge_page_size(h); | |
707 | ||
708 | folio_zero_segment(folio, (size_t)start, (size_t)end); | |
709 | ||
710 | folio_unlock(folio); | |
711 | folio_put(folio); | |
712 | } | |
713 | ||
70c3547e MK |
714 | static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) |
715 | { | |
68d32527 MK |
716 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
717 | struct address_space *mapping = inode->i_mapping; | |
70c3547e MK |
718 | struct hstate *h = hstate_inode(inode); |
719 | loff_t hpage_size = huge_page_size(h); | |
720 | loff_t hole_start, hole_end; | |
721 | ||
722 | /* | |
68d32527 | 723 | * hole_start and hole_end indicate the full pages within the hole. |
70c3547e MK |
724 | */ |
725 | hole_start = round_up(offset, hpage_size); | |
726 | hole_end = round_down(offset + len, hpage_size); | |
727 | ||
68d32527 MK |
728 | inode_lock(inode); |
729 | ||
730 | /* protected by i_rwsem */ | |
731 | if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) { | |
732 | inode_unlock(inode); | |
733 | return -EPERM; | |
734 | } | |
70c3547e | 735 | |
68d32527 | 736 | i_mmap_lock_write(mapping); |
ff62a342 | 737 | |
68d32527 MK |
738 | /* If range starts before first full page, zero partial page. */ |
739 | if (offset < hole_start) | |
740 | hugetlbfs_zero_partial_page(h, mapping, | |
741 | offset, min(offset + len, hole_start)); | |
ff62a342 | 742 | |
68d32527 MK |
743 | /* Unmap users of full pages in the hole. */ |
744 | if (hole_end > hole_start) { | |
f808c13f | 745 | if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) |
70c3547e | 746 | hugetlb_vmdelete_list(&mapping->i_mmap, |
05e90bd0 PX |
747 | hole_start >> PAGE_SHIFT, |
748 | hole_end >> PAGE_SHIFT, 0); | |
70c3547e MK |
749 | } |
750 | ||
68d32527 MK |
751 | /* If range extends beyond last full page, zero partial page. */ |
752 | if ((offset + len) > hole_end && (offset + len) > hole_start) | |
753 | hugetlbfs_zero_partial_page(h, mapping, | |
754 | hole_end, offset + len); | |
755 | ||
756 | i_mmap_unlock_write(mapping); | |
757 | ||
758 | /* Remove full pages from the file. */ | |
759 | if (hole_end > hole_start) | |
760 | remove_inode_hugepages(inode, hole_start, hole_end); | |
761 | ||
762 | inode_unlock(inode); | |
763 | ||
70c3547e MK |
764 | return 0; |
765 | } | |
766 | ||
767 | static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, | |
768 | loff_t len) | |
769 | { | |
770 | struct inode *inode = file_inode(file); | |
ff62a342 | 771 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
70c3547e MK |
772 | struct address_space *mapping = inode->i_mapping; |
773 | struct hstate *h = hstate_inode(inode); | |
774 | struct vm_area_struct pseudo_vma; | |
775 | struct mm_struct *mm = current->mm; | |
776 | loff_t hpage_size = huge_page_size(h); | |
777 | unsigned long hpage_shift = huge_page_shift(h); | |
778 | pgoff_t start, index, end; | |
779 | int error; | |
780 | u32 hash; | |
781 | ||
782 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
783 | return -EOPNOTSUPP; | |
784 | ||
785 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
786 | return hugetlbfs_punch_hole(inode, offset, len); | |
787 | ||
788 | /* | |
789 | * Default preallocate case. | |
790 | * For this range, start is rounded down and end is rounded up | |
791 | * as well as being converted to page offsets. | |
792 | */ | |
793 | start = offset >> hpage_shift; | |
794 | end = (offset + len + hpage_size - 1) >> hpage_shift; | |
795 | ||
5955102c | 796 | inode_lock(inode); |
70c3547e MK |
797 | |
798 | /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ | |
799 | error = inode_newsize_ok(inode, offset + len); | |
800 | if (error) | |
801 | goto out; | |
802 | ||
ff62a342 MAL |
803 | if ((info->seals & F_SEAL_GROW) && offset + len > inode->i_size) { |
804 | error = -EPERM; | |
805 | goto out; | |
806 | } | |
807 | ||
70c3547e MK |
808 | /* |
809 | * Initialize a pseudo vma as this is required by the huge page | |
810 | * allocation routines. If NUMA is configured, use page index | |
811 | * as input to create an allocation policy. | |
812 | */ | |
2c4541e2 | 813 | vma_init(&pseudo_vma, mm); |
1c71222e | 814 | vm_flags_init(&pseudo_vma, VM_HUGETLB | VM_MAYSHARE | VM_SHARED); |
70c3547e MK |
815 | pseudo_vma.vm_file = file; |
816 | ||
817 | for (index = start; index < end; index++) { | |
818 | /* | |
819 | * This is supposed to be the vaddr where the page is being | |
820 | * faulted in, but we have no vaddr here. | |
821 | */ | |
d0ce0e47 | 822 | struct folio *folio; |
70c3547e | 823 | unsigned long addr; |
d0ce0e47 | 824 | bool present; |
70c3547e MK |
825 | |
826 | cond_resched(); | |
827 | ||
828 | /* | |
829 | * fallocate(2) manpage permits EINTR; we may have been | |
830 | * interrupted because we are using up too much memory. | |
831 | */ | |
832 | if (signal_pending(current)) { | |
833 | error = -EINTR; | |
834 | break; | |
835 | } | |
836 | ||
837 | /* Set numa allocation policy based on index */ | |
838 | hugetlb_set_vma_policy(&pseudo_vma, inode, index); | |
839 | ||
840 | /* addr is the offset within the file (zero based) */ | |
841 | addr = index * hpage_size; | |
842 | ||
188a3972 | 843 | /* mutex taken here, fault path and hole punch */ |
188b04a7 | 844 | hash = hugetlb_fault_mutex_hash(mapping, index); |
70c3547e MK |
845 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
846 | ||
847 | /* See if already present in mapping to avoid alloc/free */ | |
d0ce0e47 SK |
848 | rcu_read_lock(); |
849 | present = page_cache_next_miss(mapping, index, 1) != index; | |
850 | rcu_read_unlock(); | |
851 | if (present) { | |
70c3547e MK |
852 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
853 | hugetlb_drop_vma_policy(&pseudo_vma); | |
854 | continue; | |
855 | } | |
856 | ||
88ce3fef | 857 | /* |
d0ce0e47 | 858 | * Allocate folio without setting the avoid_reserve argument. |
88ce3fef ML |
859 | * There certainly are no reserves associated with the |
860 | * pseudo_vma. However, there could be shared mappings with | |
861 | * reserves for the file at the inode level. If we fallocate | |
d0ce0e47 | 862 | * folios in these areas, we need to consume the reserves |
88ce3fef ML |
863 | * to keep reservation accounting consistent. |
864 | */ | |
d0ce0e47 | 865 | folio = alloc_hugetlb_folio(&pseudo_vma, addr, 0); |
70c3547e | 866 | hugetlb_drop_vma_policy(&pseudo_vma); |
d0ce0e47 | 867 | if (IS_ERR(folio)) { |
70c3547e | 868 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
d0ce0e47 | 869 | error = PTR_ERR(folio); |
70c3547e MK |
870 | goto out; |
871 | } | |
d0ce0e47 SK |
872 | clear_huge_page(&folio->page, addr, pages_per_huge_page(h)); |
873 | __folio_mark_uptodate(folio); | |
9b91c0e2 | 874 | error = hugetlb_add_to_page_cache(folio, mapping, index); |
70c3547e | 875 | if (unlikely(error)) { |
d2d7bb44 | 876 | restore_reserve_on_error(h, &pseudo_vma, addr, folio); |
d0ce0e47 | 877 | folio_put(folio); |
70c3547e MK |
878 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
879 | goto out; | |
880 | } | |
881 | ||
882 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); | |
883 | ||
d0ce0e47 | 884 | folio_set_hugetlb_migratable(folio); |
70c3547e | 885 | /* |
d0ce0e47 SK |
886 | * folio_unlock because locked by hugetlb_add_to_page_cache() |
887 | * folio_put() due to reference from alloc_hugetlb_folio() | |
70c3547e | 888 | */ |
d0ce0e47 SK |
889 | folio_unlock(folio); |
890 | folio_put(folio); | |
70c3547e MK |
891 | } |
892 | ||
893 | if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) | |
894 | i_size_write(inode, offset + len); | |
078cd827 | 895 | inode->i_ctime = current_time(inode); |
70c3547e | 896 | out: |
5955102c | 897 | inode_unlock(inode); |
70c3547e MK |
898 | return error; |
899 | } | |
900 | ||
c1632a0f | 901 | static int hugetlbfs_setattr(struct mnt_idmap *idmap, |
549c7297 | 902 | struct dentry *dentry, struct iattr *attr) |
1da177e4 | 903 | { |
2b0143b5 | 904 | struct inode *inode = d_inode(dentry); |
a5516438 | 905 | struct hstate *h = hstate_inode(inode); |
1da177e4 LT |
906 | int error; |
907 | unsigned int ia_valid = attr->ia_valid; | |
ff62a342 | 908 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
1da177e4 | 909 | |
c1632a0f | 910 | error = setattr_prepare(&nop_mnt_idmap, dentry, attr); |
1da177e4 | 911 | if (error) |
1025774c | 912 | return error; |
1da177e4 LT |
913 | |
914 | if (ia_valid & ATTR_SIZE) { | |
ff62a342 MAL |
915 | loff_t oldsize = inode->i_size; |
916 | loff_t newsize = attr->ia_size; | |
917 | ||
918 | if (newsize & ~huge_page_mask(h)) | |
1025774c | 919 | return -EINVAL; |
398c0da7 | 920 | /* protected by i_rwsem */ |
ff62a342 MAL |
921 | if ((newsize < oldsize && (info->seals & F_SEAL_SHRINK)) || |
922 | (newsize > oldsize && (info->seals & F_SEAL_GROW))) | |
923 | return -EPERM; | |
e5d319de | 924 | hugetlb_vmtruncate(inode, newsize); |
1da177e4 | 925 | } |
1025774c | 926 | |
c1632a0f | 927 | setattr_copy(&nop_mnt_idmap, inode, attr); |
1025774c CH |
928 | mark_inode_dirty(inode); |
929 | return 0; | |
1da177e4 LT |
930 | } |
931 | ||
7d54fa64 | 932 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
32021982 | 933 | struct hugetlbfs_fs_context *ctx) |
1da177e4 LT |
934 | { |
935 | struct inode *inode; | |
1da177e4 LT |
936 | |
937 | inode = new_inode(sb); | |
938 | if (inode) { | |
85fe4025 | 939 | inode->i_ino = get_next_ino(); |
32021982 DH |
940 | inode->i_mode = S_IFDIR | ctx->mode; |
941 | inode->i_uid = ctx->uid; | |
942 | inode->i_gid = ctx->gid; | |
078cd827 | 943 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
7d54fa64 AV |
944 | inode->i_op = &hugetlbfs_dir_inode_operations; |
945 | inode->i_fop = &simple_dir_operations; | |
946 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
947 | inc_nlink(inode); | |
65ed7601 | 948 | lockdep_annotate_inode_mutex_key(inode); |
7d54fa64 AV |
949 | } |
950 | return inode; | |
951 | } | |
952 | ||
b610ded7 | 953 | /* |
c8c06efa | 954 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
b610ded7 | 955 | * be taken from reclaim -- unlike regular filesystems. This needs an |
88f306b6 | 956 | * annotation because huge_pmd_share() does an allocation under hugetlb's |
c8c06efa | 957 | * i_mmap_rwsem. |
b610ded7 | 958 | */ |
c8c06efa | 959 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
b610ded7 | 960 | |
7d54fa64 AV |
961 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
962 | struct inode *dir, | |
18df2252 | 963 | umode_t mode, dev_t dev) |
7d54fa64 AV |
964 | { |
965 | struct inode *inode; | |
58b6e5e8 | 966 | struct resv_map *resv_map = NULL; |
9119a41e | 967 | |
58b6e5e8 MK |
968 | /* |
969 | * Reserve maps are only needed for inodes that can have associated | |
970 | * page allocations. | |
971 | */ | |
972 | if (S_ISREG(mode) || S_ISLNK(mode)) { | |
973 | resv_map = resv_map_alloc(); | |
974 | if (!resv_map) | |
975 | return NULL; | |
976 | } | |
7d54fa64 AV |
977 | |
978 | inode = new_inode(sb); | |
979 | if (inode) { | |
ff62a342 MAL |
980 | struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); |
981 | ||
7d54fa64 | 982 | inode->i_ino = get_next_ino(); |
f2d40141 | 983 | inode_init_owner(&nop_mnt_idmap, inode, dir, mode); |
c8c06efa DB |
984 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
985 | &hugetlbfs_i_mmap_rwsem_key); | |
1da177e4 | 986 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
078cd827 | 987 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
9119a41e | 988 | inode->i_mapping->private_data = resv_map; |
ff62a342 | 989 | info->seals = F_SEAL_SEAL; |
1da177e4 LT |
990 | switch (mode & S_IFMT) { |
991 | default: | |
992 | init_special_inode(inode, mode, dev); | |
993 | break; | |
994 | case S_IFREG: | |
995 | inode->i_op = &hugetlbfs_inode_operations; | |
996 | inode->i_fop = &hugetlbfs_file_operations; | |
997 | break; | |
998 | case S_IFDIR: | |
999 | inode->i_op = &hugetlbfs_dir_inode_operations; | |
1000 | inode->i_fop = &simple_dir_operations; | |
1001 | ||
1002 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 1003 | inc_nlink(inode); |
1da177e4 LT |
1004 | break; |
1005 | case S_IFLNK: | |
1006 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 1007 | inode_nohighmem(inode); |
1da177e4 LT |
1008 | break; |
1009 | } | |
e096d0c7 | 1010 | lockdep_annotate_inode_mutex_key(inode); |
58b6e5e8 MK |
1011 | } else { |
1012 | if (resv_map) | |
1013 | kref_put(&resv_map->refs, resv_map_release); | |
1014 | } | |
9119a41e | 1015 | |
1da177e4 LT |
1016 | return inode; |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * File creation. Allocate an inode, and we're done.. | |
1021 | */ | |
5ebb29be | 1022 | static int hugetlbfs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
19ee5345 | 1023 | struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4 LT |
1024 | { |
1025 | struct inode *inode; | |
7d54fa64 AV |
1026 | |
1027 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); | |
19ee5345 AV |
1028 | if (!inode) |
1029 | return -ENOSPC; | |
1030 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
1031 | d_instantiate(dentry, inode); | |
1032 | dget(dentry);/* Extra count - pin the dentry in core */ | |
1033 | return 0; | |
1ab5b82f PS |
1034 | } |
1035 | ||
c54bd91e | 1036 | static int hugetlbfs_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1037 | struct dentry *dentry, umode_t mode) |
1da177e4 | 1038 | { |
5ebb29be | 1039 | int retval = hugetlbfs_mknod(&nop_mnt_idmap, dir, dentry, |
549c7297 | 1040 | mode | S_IFDIR, 0); |
1da177e4 | 1041 | if (!retval) |
d8c76e6f | 1042 | inc_nlink(dir); |
1da177e4 LT |
1043 | return retval; |
1044 | } | |
1045 | ||
6c960e68 | 1046 | static int hugetlbfs_create(struct mnt_idmap *idmap, |
549c7297 CB |
1047 | struct inode *dir, struct dentry *dentry, |
1048 | umode_t mode, bool excl) | |
1da177e4 | 1049 | { |
5ebb29be | 1050 | return hugetlbfs_mknod(&nop_mnt_idmap, dir, dentry, mode | S_IFREG, 0); |
1da177e4 LT |
1051 | } |
1052 | ||
011e2b71 | 1053 | static int hugetlbfs_tmpfile(struct mnt_idmap *idmap, |
863f144f | 1054 | struct inode *dir, struct file *file, |
549c7297 | 1055 | umode_t mode) |
1ab5b82f | 1056 | { |
19ee5345 AV |
1057 | struct inode *inode; |
1058 | ||
1059 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode | S_IFREG, 0); | |
1060 | if (!inode) | |
1061 | return -ENOSPC; | |
1062 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
863f144f MS |
1063 | d_tmpfile(file, inode); |
1064 | return finish_open_simple(file, 0); | |
1ab5b82f PS |
1065 | } |
1066 | ||
7a77db95 | 1067 | static int hugetlbfs_symlink(struct mnt_idmap *idmap, |
549c7297 CB |
1068 | struct inode *dir, struct dentry *dentry, |
1069 | const char *symname) | |
1da177e4 LT |
1070 | { |
1071 | struct inode *inode; | |
1072 | int error = -ENOSPC; | |
1da177e4 | 1073 | |
7d54fa64 | 1074 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
1da177e4 LT |
1075 | if (inode) { |
1076 | int l = strlen(symname)+1; | |
1077 | error = page_symlink(inode, symname, l); | |
1078 | if (!error) { | |
1079 | d_instantiate(dentry, inode); | |
1080 | dget(dentry); | |
1081 | } else | |
1082 | iput(inode); | |
1083 | } | |
078cd827 | 1084 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4 LT |
1085 | |
1086 | return error; | |
1087 | } | |
1088 | ||
b890ec2a MWO |
1089 | #ifdef CONFIG_MIGRATION |
1090 | static int hugetlbfs_migrate_folio(struct address_space *mapping, | |
1091 | struct folio *dst, struct folio *src, | |
a6bc32b8 | 1092 | enum migrate_mode mode) |
290408d4 NH |
1093 | { |
1094 | int rc; | |
1095 | ||
b890ec2a | 1096 | rc = migrate_huge_page_move_mapping(mapping, dst, src); |
78bd5209 | 1097 | if (rc != MIGRATEPAGE_SUCCESS) |
290408d4 | 1098 | return rc; |
cb6acd01 | 1099 | |
149562f7 SK |
1100 | if (hugetlb_folio_subpool(src)) { |
1101 | hugetlb_set_folio_subpool(dst, | |
1102 | hugetlb_folio_subpool(src)); | |
1103 | hugetlb_set_folio_subpool(src, NULL); | |
cb6acd01 MK |
1104 | } |
1105 | ||
2916ecc0 | 1106 | if (mode != MIGRATE_SYNC_NO_COPY) |
b890ec2a | 1107 | folio_migrate_copy(dst, src); |
2916ecc0 | 1108 | else |
b890ec2a | 1109 | folio_migrate_flags(dst, src); |
290408d4 | 1110 | |
78bd5209 | 1111 | return MIGRATEPAGE_SUCCESS; |
290408d4 | 1112 | } |
b890ec2a MWO |
1113 | #else |
1114 | #define hugetlbfs_migrate_folio NULL | |
1115 | #endif | |
290408d4 | 1116 | |
78bb9203 NH |
1117 | static int hugetlbfs_error_remove_page(struct address_space *mapping, |
1118 | struct page *page) | |
1119 | { | |
78bb9203 NH |
1120 | return 0; |
1121 | } | |
1122 | ||
4a25220d DH |
1123 | /* |
1124 | * Display the mount options in /proc/mounts. | |
1125 | */ | |
1126 | static int hugetlbfs_show_options(struct seq_file *m, struct dentry *root) | |
1127 | { | |
1128 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(root->d_sb); | |
1129 | struct hugepage_subpool *spool = sbinfo->spool; | |
1130 | unsigned long hpage_size = huge_page_size(sbinfo->hstate); | |
1131 | unsigned hpage_shift = huge_page_shift(sbinfo->hstate); | |
1132 | char mod; | |
1133 | ||
1134 | if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) | |
1135 | seq_printf(m, ",uid=%u", | |
1136 | from_kuid_munged(&init_user_ns, sbinfo->uid)); | |
1137 | if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) | |
1138 | seq_printf(m, ",gid=%u", | |
1139 | from_kgid_munged(&init_user_ns, sbinfo->gid)); | |
1140 | if (sbinfo->mode != 0755) | |
1141 | seq_printf(m, ",mode=%o", sbinfo->mode); | |
1142 | if (sbinfo->max_inodes != -1) | |
1143 | seq_printf(m, ",nr_inodes=%lu", sbinfo->max_inodes); | |
1144 | ||
1145 | hpage_size /= 1024; | |
1146 | mod = 'K'; | |
1147 | if (hpage_size >= 1024) { | |
1148 | hpage_size /= 1024; | |
1149 | mod = 'M'; | |
1150 | } | |
1151 | seq_printf(m, ",pagesize=%lu%c", hpage_size, mod); | |
1152 | if (spool) { | |
1153 | if (spool->max_hpages != -1) | |
1154 | seq_printf(m, ",size=%llu", | |
1155 | (unsigned long long)spool->max_hpages << hpage_shift); | |
1156 | if (spool->min_hpages != -1) | |
1157 | seq_printf(m, ",min_size=%llu", | |
1158 | (unsigned long long)spool->min_hpages << hpage_shift); | |
1159 | } | |
1160 | return 0; | |
1161 | } | |
1162 | ||
726c3342 | 1163 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 1164 | { |
726c3342 | 1165 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
2b0143b5 | 1166 | struct hstate *h = hstate_inode(d_inode(dentry)); |
1da177e4 LT |
1167 | |
1168 | buf->f_type = HUGETLBFS_MAGIC; | |
a5516438 | 1169 | buf->f_bsize = huge_page_size(h); |
1da177e4 LT |
1170 | if (sbinfo) { |
1171 | spin_lock(&sbinfo->stat_lock); | |
11680763 | 1172 | /* If no limits set, just report 0 or -1 for max/free/used |
74a8a65c | 1173 | * blocks, like simple_statfs() */ |
90481622 DG |
1174 | if (sbinfo->spool) { |
1175 | long free_pages; | |
1176 | ||
4b25f030 | 1177 | spin_lock_irq(&sbinfo->spool->lock); |
90481622 DG |
1178 | buf->f_blocks = sbinfo->spool->max_hpages; |
1179 | free_pages = sbinfo->spool->max_hpages | |
1180 | - sbinfo->spool->used_hpages; | |
1181 | buf->f_bavail = buf->f_bfree = free_pages; | |
4b25f030 | 1182 | spin_unlock_irq(&sbinfo->spool->lock); |
74a8a65c DG |
1183 | buf->f_files = sbinfo->max_inodes; |
1184 | buf->f_ffree = sbinfo->free_inodes; | |
1185 | } | |
1da177e4 LT |
1186 | spin_unlock(&sbinfo->stat_lock); |
1187 | } | |
1188 | buf->f_namelen = NAME_MAX; | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | static void hugetlbfs_put_super(struct super_block *sb) | |
1193 | { | |
1194 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); | |
1195 | ||
1196 | if (sbi) { | |
1197 | sb->s_fs_info = NULL; | |
90481622 DG |
1198 | |
1199 | if (sbi->spool) | |
1200 | hugepage_put_subpool(sbi->spool); | |
1201 | ||
1da177e4 LT |
1202 | kfree(sbi); |
1203 | } | |
1204 | } | |
1205 | ||
96527980 CH |
1206 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
1207 | { | |
1208 | if (sbinfo->free_inodes >= 0) { | |
1209 | spin_lock(&sbinfo->stat_lock); | |
1210 | if (unlikely(!sbinfo->free_inodes)) { | |
1211 | spin_unlock(&sbinfo->stat_lock); | |
1212 | return 0; | |
1213 | } | |
1214 | sbinfo->free_inodes--; | |
1215 | spin_unlock(&sbinfo->stat_lock); | |
1216 | } | |
1217 | ||
1218 | return 1; | |
1219 | } | |
1220 | ||
1221 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) | |
1222 | { | |
1223 | if (sbinfo->free_inodes >= 0) { | |
1224 | spin_lock(&sbinfo->stat_lock); | |
1225 | sbinfo->free_inodes++; | |
1226 | spin_unlock(&sbinfo->stat_lock); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | ||
e18b890b | 1231 | static struct kmem_cache *hugetlbfs_inode_cachep; |
1da177e4 LT |
1232 | |
1233 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) | |
1234 | { | |
96527980 | 1235 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
1da177e4 LT |
1236 | struct hugetlbfs_inode_info *p; |
1237 | ||
96527980 CH |
1238 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
1239 | return NULL; | |
fd60b288 | 1240 | p = alloc_inode_sb(sb, hugetlbfs_inode_cachep, GFP_KERNEL); |
96527980 CH |
1241 | if (unlikely(!p)) { |
1242 | hugetlbfs_inc_free_inodes(sbinfo); | |
1da177e4 | 1243 | return NULL; |
96527980 | 1244 | } |
4742a35d MK |
1245 | |
1246 | /* | |
1247 | * Any time after allocation, hugetlbfs_destroy_inode can be called | |
1248 | * for the inode. mpol_free_shared_policy is unconditionally called | |
1249 | * as part of hugetlbfs_destroy_inode. So, initialize policy here | |
1250 | * in case of a quick call to destroy. | |
1251 | * | |
1252 | * Note that the policy is initialized even if we are creating a | |
1253 | * private inode. This simplifies hugetlbfs_destroy_inode. | |
1254 | */ | |
1255 | mpol_shared_policy_init(&p->policy, NULL); | |
1256 | ||
1da177e4 LT |
1257 | return &p->vfs_inode; |
1258 | } | |
1259 | ||
b62de322 | 1260 | static void hugetlbfs_free_inode(struct inode *inode) |
fa0d7e3d | 1261 | { |
fa0d7e3d NP |
1262 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
1263 | } | |
1264 | ||
1da177e4 LT |
1265 | static void hugetlbfs_destroy_inode(struct inode *inode) |
1266 | { | |
96527980 | 1267 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
1da177e4 | 1268 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
1da177e4 LT |
1269 | } |
1270 | ||
f5e54d6e | 1271 | static const struct address_space_operations hugetlbfs_aops = { |
800d15a5 NP |
1272 | .write_begin = hugetlbfs_write_begin, |
1273 | .write_end = hugetlbfs_write_end, | |
46de8b97 | 1274 | .dirty_folio = noop_dirty_folio, |
b890ec2a | 1275 | .migrate_folio = hugetlbfs_migrate_folio, |
78bb9203 | 1276 | .error_remove_page = hugetlbfs_error_remove_page, |
1da177e4 LT |
1277 | }; |
1278 | ||
96527980 | 1279 | |
51cc5068 | 1280 | static void init_once(void *foo) |
96527980 | 1281 | { |
dbaf7dc9 | 1282 | struct hugetlbfs_inode_info *ei = foo; |
96527980 | 1283 | |
a35afb83 | 1284 | inode_init_once(&ei->vfs_inode); |
96527980 CH |
1285 | } |
1286 | ||
4b6f5d20 | 1287 | const struct file_operations hugetlbfs_file_operations = { |
34d0640e | 1288 | .read_iter = hugetlbfs_read_iter, |
1da177e4 | 1289 | .mmap = hugetlbfs_file_mmap, |
1b061d92 | 1290 | .fsync = noop_fsync, |
1da177e4 | 1291 | .get_unmapped_area = hugetlb_get_unmapped_area, |
70c3547e MK |
1292 | .llseek = default_llseek, |
1293 | .fallocate = hugetlbfs_fallocate, | |
1da177e4 LT |
1294 | }; |
1295 | ||
92e1d5be | 1296 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
1da177e4 LT |
1297 | .create = hugetlbfs_create, |
1298 | .lookup = simple_lookup, | |
1299 | .link = simple_link, | |
1300 | .unlink = simple_unlink, | |
1301 | .symlink = hugetlbfs_symlink, | |
1302 | .mkdir = hugetlbfs_mkdir, | |
1303 | .rmdir = simple_rmdir, | |
1304 | .mknod = hugetlbfs_mknod, | |
1305 | .rename = simple_rename, | |
1306 | .setattr = hugetlbfs_setattr, | |
1ab5b82f | 1307 | .tmpfile = hugetlbfs_tmpfile, |
1da177e4 LT |
1308 | }; |
1309 | ||
92e1d5be | 1310 | static const struct inode_operations hugetlbfs_inode_operations = { |
1da177e4 LT |
1311 | .setattr = hugetlbfs_setattr, |
1312 | }; | |
1313 | ||
ee9b6d61 | 1314 | static const struct super_operations hugetlbfs_ops = { |
1da177e4 | 1315 | .alloc_inode = hugetlbfs_alloc_inode, |
b62de322 | 1316 | .free_inode = hugetlbfs_free_inode, |
1da177e4 | 1317 | .destroy_inode = hugetlbfs_destroy_inode, |
2bbbda30 | 1318 | .evict_inode = hugetlbfs_evict_inode, |
1da177e4 | 1319 | .statfs = hugetlbfs_statfs, |
1da177e4 | 1320 | .put_super = hugetlbfs_put_super, |
4a25220d | 1321 | .show_options = hugetlbfs_show_options, |
1da177e4 LT |
1322 | }; |
1323 | ||
7ca02d0a MK |
1324 | /* |
1325 | * Convert size option passed from command line to number of huge pages | |
1326 | * in the pool specified by hstate. Size option could be in bytes | |
1327 | * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT). | |
1328 | */ | |
4a25220d | 1329 | static long |
7ca02d0a | 1330 | hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt, |
4a25220d | 1331 | enum hugetlbfs_size_type val_type) |
7ca02d0a MK |
1332 | { |
1333 | if (val_type == NO_SIZE) | |
1334 | return -1; | |
1335 | ||
1336 | if (val_type == SIZE_PERCENT) { | |
1337 | size_opt <<= huge_page_shift(h); | |
1338 | size_opt *= h->max_huge_pages; | |
1339 | do_div(size_opt, 100); | |
1340 | } | |
1341 | ||
1342 | size_opt >>= huge_page_shift(h); | |
1343 | return size_opt; | |
1344 | } | |
1345 | ||
32021982 DH |
1346 | /* |
1347 | * Parse one mount parameter. | |
1348 | */ | |
1349 | static int hugetlbfs_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
1da177e4 | 1350 | { |
32021982 DH |
1351 | struct hugetlbfs_fs_context *ctx = fc->fs_private; |
1352 | struct fs_parse_result result; | |
1353 | char *rest; | |
1354 | unsigned long ps; | |
1355 | int opt; | |
1356 | ||
d7167b14 | 1357 | opt = fs_parse(fc, hugetlb_fs_parameters, param, &result); |
32021982 DH |
1358 | if (opt < 0) |
1359 | return opt; | |
1360 | ||
1361 | switch (opt) { | |
1362 | case Opt_uid: | |
1363 | ctx->uid = make_kuid(current_user_ns(), result.uint_32); | |
1364 | if (!uid_valid(ctx->uid)) | |
1365 | goto bad_val; | |
1da177e4 | 1366 | return 0; |
1da177e4 | 1367 | |
32021982 DH |
1368 | case Opt_gid: |
1369 | ctx->gid = make_kgid(current_user_ns(), result.uint_32); | |
1370 | if (!gid_valid(ctx->gid)) | |
1371 | goto bad_val; | |
1372 | return 0; | |
e73a75fa | 1373 | |
32021982 DH |
1374 | case Opt_mode: |
1375 | ctx->mode = result.uint_32 & 01777U; | |
1376 | return 0; | |
e73a75fa | 1377 | |
32021982 DH |
1378 | case Opt_size: |
1379 | /* memparse() will accept a K/M/G without a digit */ | |
26215b7e | 1380 | if (!param->string || !isdigit(param->string[0])) |
32021982 DH |
1381 | goto bad_val; |
1382 | ctx->max_size_opt = memparse(param->string, &rest); | |
1383 | ctx->max_val_type = SIZE_STD; | |
1384 | if (*rest == '%') | |
1385 | ctx->max_val_type = SIZE_PERCENT; | |
1386 | return 0; | |
e73a75fa | 1387 | |
32021982 DH |
1388 | case Opt_nr_inodes: |
1389 | /* memparse() will accept a K/M/G without a digit */ | |
26215b7e | 1390 | if (!param->string || !isdigit(param->string[0])) |
32021982 DH |
1391 | goto bad_val; |
1392 | ctx->nr_inodes = memparse(param->string, &rest); | |
1393 | return 0; | |
e73a75fa | 1394 | |
32021982 DH |
1395 | case Opt_pagesize: |
1396 | ps = memparse(param->string, &rest); | |
1397 | ctx->hstate = size_to_hstate(ps); | |
1398 | if (!ctx->hstate) { | |
d0036517 | 1399 | pr_err("Unsupported page size %lu MB\n", ps / SZ_1M); |
32021982 | 1400 | return -EINVAL; |
e73a75fa | 1401 | } |
32021982 | 1402 | return 0; |
1da177e4 | 1403 | |
32021982 DH |
1404 | case Opt_min_size: |
1405 | /* memparse() will accept a K/M/G without a digit */ | |
26215b7e | 1406 | if (!param->string || !isdigit(param->string[0])) |
32021982 DH |
1407 | goto bad_val; |
1408 | ctx->min_size_opt = memparse(param->string, &rest); | |
1409 | ctx->min_val_type = SIZE_STD; | |
1410 | if (*rest == '%') | |
1411 | ctx->min_val_type = SIZE_PERCENT; | |
1412 | return 0; | |
e73a75fa | 1413 | |
32021982 DH |
1414 | default: |
1415 | return -EINVAL; | |
1416 | } | |
a137e1cc | 1417 | |
32021982 | 1418 | bad_val: |
b5db30cf | 1419 | return invalfc(fc, "Bad value '%s' for mount option '%s'\n", |
32021982 DH |
1420 | param->string, param->key); |
1421 | } | |
7ca02d0a | 1422 | |
32021982 DH |
1423 | /* |
1424 | * Validate the parsed options. | |
1425 | */ | |
1426 | static int hugetlbfs_validate(struct fs_context *fc) | |
1427 | { | |
1428 | struct hugetlbfs_fs_context *ctx = fc->fs_private; | |
a137e1cc | 1429 | |
7ca02d0a MK |
1430 | /* |
1431 | * Use huge page pool size (in hstate) to convert the size | |
1432 | * options to number of huge pages. If NO_SIZE, -1 is returned. | |
1433 | */ | |
32021982 DH |
1434 | ctx->max_hpages = hugetlbfs_size_to_hpages(ctx->hstate, |
1435 | ctx->max_size_opt, | |
1436 | ctx->max_val_type); | |
1437 | ctx->min_hpages = hugetlbfs_size_to_hpages(ctx->hstate, | |
1438 | ctx->min_size_opt, | |
1439 | ctx->min_val_type); | |
7ca02d0a MK |
1440 | |
1441 | /* | |
1442 | * If max_size was specified, then min_size must be smaller | |
1443 | */ | |
32021982 DH |
1444 | if (ctx->max_val_type > NO_SIZE && |
1445 | ctx->min_hpages > ctx->max_hpages) { | |
1446 | pr_err("Minimum size can not be greater than maximum size\n"); | |
7ca02d0a | 1447 | return -EINVAL; |
a137e1cc AK |
1448 | } |
1449 | ||
1da177e4 LT |
1450 | return 0; |
1451 | } | |
1452 | ||
1453 | static int | |
32021982 | 1454 | hugetlbfs_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 1455 | { |
32021982 | 1456 | struct hugetlbfs_fs_context *ctx = fc->fs_private; |
1da177e4 LT |
1457 | struct hugetlbfs_sb_info *sbinfo; |
1458 | ||
1da177e4 LT |
1459 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
1460 | if (!sbinfo) | |
1461 | return -ENOMEM; | |
1462 | sb->s_fs_info = sbinfo; | |
1463 | spin_lock_init(&sbinfo->stat_lock); | |
32021982 DH |
1464 | sbinfo->hstate = ctx->hstate; |
1465 | sbinfo->max_inodes = ctx->nr_inodes; | |
1466 | sbinfo->free_inodes = ctx->nr_inodes; | |
1467 | sbinfo->spool = NULL; | |
1468 | sbinfo->uid = ctx->uid; | |
1469 | sbinfo->gid = ctx->gid; | |
1470 | sbinfo->mode = ctx->mode; | |
4a25220d | 1471 | |
7ca02d0a MK |
1472 | /* |
1473 | * Allocate and initialize subpool if maximum or minimum size is | |
1935ebd3 | 1474 | * specified. Any needed reservations (for minimum size) are taken |
445c8098 | 1475 | * when the subpool is created. |
7ca02d0a | 1476 | */ |
32021982 DH |
1477 | if (ctx->max_hpages != -1 || ctx->min_hpages != -1) { |
1478 | sbinfo->spool = hugepage_new_subpool(ctx->hstate, | |
1479 | ctx->max_hpages, | |
1480 | ctx->min_hpages); | |
90481622 DG |
1481 | if (!sbinfo->spool) |
1482 | goto out_free; | |
1483 | } | |
1da177e4 | 1484 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
32021982 DH |
1485 | sb->s_blocksize = huge_page_size(ctx->hstate); |
1486 | sb->s_blocksize_bits = huge_page_shift(ctx->hstate); | |
1da177e4 LT |
1487 | sb->s_magic = HUGETLBFS_MAGIC; |
1488 | sb->s_op = &hugetlbfs_ops; | |
1489 | sb->s_time_gran = 1; | |
15568299 MK |
1490 | |
1491 | /* | |
1492 | * Due to the special and limited functionality of hugetlbfs, it does | |
1493 | * not work well as a stacking filesystem. | |
1494 | */ | |
1495 | sb->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; | |
32021982 | 1496 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, ctx)); |
48fde701 | 1497 | if (!sb->s_root) |
1da177e4 | 1498 | goto out_free; |
1da177e4 LT |
1499 | return 0; |
1500 | out_free: | |
6e6870d4 | 1501 | kfree(sbinfo->spool); |
1da177e4 LT |
1502 | kfree(sbinfo); |
1503 | return -ENOMEM; | |
1504 | } | |
1505 | ||
32021982 DH |
1506 | static int hugetlbfs_get_tree(struct fs_context *fc) |
1507 | { | |
1508 | int err = hugetlbfs_validate(fc); | |
1509 | if (err) | |
1510 | return err; | |
2ac295d4 | 1511 | return get_tree_nodev(fc, hugetlbfs_fill_super); |
32021982 DH |
1512 | } |
1513 | ||
1514 | static void hugetlbfs_fs_context_free(struct fs_context *fc) | |
1515 | { | |
1516 | kfree(fc->fs_private); | |
1517 | } | |
1518 | ||
1519 | static const struct fs_context_operations hugetlbfs_fs_context_ops = { | |
1520 | .free = hugetlbfs_fs_context_free, | |
1521 | .parse_param = hugetlbfs_parse_param, | |
1522 | .get_tree = hugetlbfs_get_tree, | |
1523 | }; | |
1524 | ||
1525 | static int hugetlbfs_init_fs_context(struct fs_context *fc) | |
1da177e4 | 1526 | { |
32021982 DH |
1527 | struct hugetlbfs_fs_context *ctx; |
1528 | ||
1529 | ctx = kzalloc(sizeof(struct hugetlbfs_fs_context), GFP_KERNEL); | |
1530 | if (!ctx) | |
1531 | return -ENOMEM; | |
1532 | ||
1533 | ctx->max_hpages = -1; /* No limit on size by default */ | |
1534 | ctx->nr_inodes = -1; /* No limit on number of inodes by default */ | |
1535 | ctx->uid = current_fsuid(); | |
1536 | ctx->gid = current_fsgid(); | |
1537 | ctx->mode = 0755; | |
1538 | ctx->hstate = &default_hstate; | |
1539 | ctx->min_hpages = -1; /* No default minimum size */ | |
1540 | ctx->max_val_type = NO_SIZE; | |
1541 | ctx->min_val_type = NO_SIZE; | |
1542 | fc->fs_private = ctx; | |
1543 | fc->ops = &hugetlbfs_fs_context_ops; | |
1544 | return 0; | |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | static struct file_system_type hugetlbfs_fs_type = { | |
32021982 DH |
1548 | .name = "hugetlbfs", |
1549 | .init_fs_context = hugetlbfs_init_fs_context, | |
d7167b14 | 1550 | .parameters = hugetlb_fs_parameters, |
32021982 | 1551 | .kill_sb = kill_litter_super, |
1da177e4 LT |
1552 | }; |
1553 | ||
42d7395f | 1554 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
1da177e4 | 1555 | |
ef1ff6b8 | 1556 | static int can_do_hugetlb_shm(void) |
1da177e4 | 1557 | { |
a0eb3a05 EB |
1558 | kgid_t shm_group; |
1559 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); | |
1560 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); | |
1da177e4 LT |
1561 | } |
1562 | ||
42d7395f AK |
1563 | static int get_hstate_idx(int page_size_log) |
1564 | { | |
af73e4d9 | 1565 | struct hstate *h = hstate_sizelog(page_size_log); |
42d7395f | 1566 | |
42d7395f AK |
1567 | if (!h) |
1568 | return -1; | |
04adbc3f | 1569 | return hstate_index(h); |
42d7395f AK |
1570 | } |
1571 | ||
af73e4d9 NH |
1572 | /* |
1573 | * Note that size should be aligned to proper hugepage size in caller side, | |
1574 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. | |
1575 | */ | |
1576 | struct file *hugetlb_file_setup(const char *name, size_t size, | |
83c1fd76 | 1577 | vm_flags_t acctflag, int creat_flags, |
1578 | int page_size_log) | |
1da177e4 | 1579 | { |
1da177e4 | 1580 | struct inode *inode; |
e68375c8 | 1581 | struct vfsmount *mnt; |
42d7395f | 1582 | int hstate_idx; |
e68375c8 | 1583 | struct file *file; |
42d7395f AK |
1584 | |
1585 | hstate_idx = get_hstate_idx(page_size_log); | |
1586 | if (hstate_idx < 0) | |
1587 | return ERR_PTR(-ENODEV); | |
1da177e4 | 1588 | |
e68375c8 AV |
1589 | mnt = hugetlbfs_vfsmount[hstate_idx]; |
1590 | if (!mnt) | |
5bc98594 AM |
1591 | return ERR_PTR(-ENOENT); |
1592 | ||
ef1ff6b8 | 1593 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
83c1fd76 | 1594 | struct ucounts *ucounts = current_ucounts(); |
1595 | ||
1596 | if (user_shm_lock(size, ucounts)) { | |
1597 | pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is obsolete\n", | |
21a3c273 | 1598 | current->comm, current->pid); |
83c1fd76 | 1599 | user_shm_unlock(size, ucounts); |
353d5c30 | 1600 | } |
83c1fd76 | 1601 | return ERR_PTR(-EPERM); |
2584e517 | 1602 | } |
1da177e4 | 1603 | |
39b65252 | 1604 | file = ERR_PTR(-ENOSPC); |
e68375c8 | 1605 | inode = hugetlbfs_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0); |
1da177e4 | 1606 | if (!inode) |
e68375c8 | 1607 | goto out; |
e1832f29 SS |
1608 | if (creat_flags == HUGETLB_SHMFS_INODE) |
1609 | inode->i_flags |= S_PRIVATE; | |
1da177e4 | 1610 | |
1da177e4 | 1611 | inode->i_size = size; |
6d6b77f1 | 1612 | clear_nlink(inode); |
ce8d2cdf | 1613 | |
33b8f84a | 1614 | if (!hugetlb_reserve_pages(inode, 0, |
e68375c8 AV |
1615 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
1616 | acctflag)) | |
1617 | file = ERR_PTR(-ENOMEM); | |
1618 | else | |
1619 | file = alloc_file_pseudo(inode, mnt, name, O_RDWR, | |
1620 | &hugetlbfs_file_operations); | |
1621 | if (!IS_ERR(file)) | |
1622 | return file; | |
1da177e4 | 1623 | |
b45b5bd6 | 1624 | iput(inode); |
e68375c8 | 1625 | out: |
39b65252 | 1626 | return file; |
1da177e4 LT |
1627 | } |
1628 | ||
32021982 DH |
1629 | static struct vfsmount *__init mount_one_hugetlbfs(struct hstate *h) |
1630 | { | |
1631 | struct fs_context *fc; | |
1632 | struct vfsmount *mnt; | |
1633 | ||
1634 | fc = fs_context_for_mount(&hugetlbfs_fs_type, SB_KERNMOUNT); | |
1635 | if (IS_ERR(fc)) { | |
1636 | mnt = ERR_CAST(fc); | |
1637 | } else { | |
1638 | struct hugetlbfs_fs_context *ctx = fc->fs_private; | |
1639 | ctx->hstate = h; | |
1640 | mnt = fc_mount(fc); | |
1641 | put_fs_context(fc); | |
1642 | } | |
1643 | if (IS_ERR(mnt)) | |
a25fddce | 1644 | pr_err("Cannot mount internal hugetlbfs for page size %luK", |
d0036517 | 1645 | huge_page_size(h) / SZ_1K); |
32021982 DH |
1646 | return mnt; |
1647 | } | |
1648 | ||
1da177e4 LT |
1649 | static int __init init_hugetlbfs_fs(void) |
1650 | { | |
32021982 | 1651 | struct vfsmount *mnt; |
42d7395f | 1652 | struct hstate *h; |
1da177e4 | 1653 | int error; |
42d7395f | 1654 | int i; |
1da177e4 | 1655 | |
457c1b27 | 1656 | if (!hugepages_supported()) { |
9b857d26 | 1657 | pr_info("disabling because there are no supported hugepage sizes\n"); |
457c1b27 NA |
1658 | return -ENOTSUPP; |
1659 | } | |
1660 | ||
d1d5e05f | 1661 | error = -ENOMEM; |
1da177e4 LT |
1662 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
1663 | sizeof(struct hugetlbfs_inode_info), | |
5d097056 | 1664 | 0, SLAB_ACCOUNT, init_once); |
1da177e4 | 1665 | if (hugetlbfs_inode_cachep == NULL) |
8fc312b3 | 1666 | goto out; |
1da177e4 LT |
1667 | |
1668 | error = register_filesystem(&hugetlbfs_fs_type); | |
1669 | if (error) | |
8fc312b3 | 1670 | goto out_free; |
1da177e4 | 1671 | |
8fc312b3 | 1672 | /* default hstate mount is required */ |
3b2275a8 | 1673 | mnt = mount_one_hugetlbfs(&default_hstate); |
8fc312b3 MK |
1674 | if (IS_ERR(mnt)) { |
1675 | error = PTR_ERR(mnt); | |
1676 | goto out_unreg; | |
1677 | } | |
1678 | hugetlbfs_vfsmount[default_hstate_idx] = mnt; | |
1679 | ||
1680 | /* other hstates are optional */ | |
42d7395f AK |
1681 | i = 0; |
1682 | for_each_hstate(h) { | |
15f0ec94 JS |
1683 | if (i == default_hstate_idx) { |
1684 | i++; | |
8fc312b3 | 1685 | continue; |
15f0ec94 | 1686 | } |
8fc312b3 | 1687 | |
32021982 | 1688 | mnt = mount_one_hugetlbfs(h); |
8fc312b3 MK |
1689 | if (IS_ERR(mnt)) |
1690 | hugetlbfs_vfsmount[i] = NULL; | |
1691 | else | |
1692 | hugetlbfs_vfsmount[i] = mnt; | |
42d7395f AK |
1693 | i++; |
1694 | } | |
32021982 DH |
1695 | |
1696 | return 0; | |
1da177e4 | 1697 | |
8fc312b3 MK |
1698 | out_unreg: |
1699 | (void)unregister_filesystem(&hugetlbfs_fs_type); | |
1700 | out_free: | |
d1d5e05f | 1701 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
8fc312b3 | 1702 | out: |
1da177e4 LT |
1703 | return error; |
1704 | } | |
3e89e1c5 | 1705 | fs_initcall(init_hugetlbfs_fs) |