Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * hugetlbpage-backed filesystem. Based on ramfs. |
| 3 | * |
Nadia Yvette Chambers | 6d49e35 | 2012-12-06 10:39:54 +0100 | [diff] [blame] | 4 | * Nadia Yvette Chambers, 2002 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 2002 Linus Torvalds. |
Paul Gortmaker | 3e89e1c | 2016-01-14 15:21:52 -0800 | [diff] [blame] | 7 | * License: GPL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/thread_info.h> |
| 13 | #include <asm/current.h> |
| 14 | #include <linux/sched.h> /* remove ASAP */ |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 15 | #include <linux/falloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/fs.h> |
| 17 | #include <linux/mount.h> |
| 18 | #include <linux/file.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 19 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 25 | #include <linux/capability.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 26 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/backing-dev.h> |
| 28 | #include <linux/hugetlb.h> |
| 29 | #include <linux/pagevec.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 30 | #include <linux/parser.h> |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 31 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/slab.h> |
| 33 | #include <linux/dnotify.h> |
| 34 | #include <linux/statfs.h> |
| 35 | #include <linux/security.h> |
Nick Black | 1fd7317d | 2009-09-22 16:43:33 -0700 | [diff] [blame] | 36 | #include <linux/magic.h> |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 37 | #include <linux/migrate.h> |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 38 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include <asm/uaccess.h> |
| 41 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 42 | static const struct super_operations hugetlbfs_ops; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 43 | static const struct address_space_operations hugetlbfs_aops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 44 | const struct file_operations hugetlbfs_file_operations; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 45 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
| 46 | static const struct inode_operations hugetlbfs_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 48 | struct hugetlbfs_config { |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 49 | kuid_t uid; |
| 50 | kgid_t gid; |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 51 | umode_t mode; |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 52 | long max_hpages; |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 53 | long nr_inodes; |
| 54 | struct hstate *hstate; |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 55 | long min_hpages; |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | struct hugetlbfs_inode_info { |
| 59 | struct shared_policy policy; |
| 60 | struct inode vfs_inode; |
| 61 | }; |
| 62 | |
| 63 | static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) |
| 64 | { |
| 65 | return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); |
| 66 | } |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | int sysctl_hugetlb_shm_group; |
| 69 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 70 | enum { |
| 71 | Opt_size, Opt_nr_inodes, |
| 72 | Opt_mode, Opt_uid, Opt_gid, |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 73 | Opt_pagesize, Opt_min_size, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 74 | Opt_err, |
| 75 | }; |
| 76 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 77 | static const match_table_t tokens = { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 78 | {Opt_size, "size=%s"}, |
| 79 | {Opt_nr_inodes, "nr_inodes=%s"}, |
| 80 | {Opt_mode, "mode=%o"}, |
| 81 | {Opt_uid, "uid=%u"}, |
| 82 | {Opt_gid, "gid=%u"}, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 83 | {Opt_pagesize, "pagesize=%s"}, |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 84 | {Opt_min_size, "min_size=%s"}, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 85 | {Opt_err, NULL}, |
| 86 | }; |
| 87 | |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 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 | |
Adam Litke | 2e9b367 | 2005-10-29 18:16:47 -0700 | [diff] [blame] | 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 | |
Mike Kravetz | 447effd | 2018-03-22 16:17:13 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 132 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 133 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | loff_t len, vma_len; |
| 135 | int ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 136 | struct hstate *h = hstate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 138 | /* |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 139 | * vma address alignment (but not the pgoff alignment) has |
| 140 | * already been checked by prepare_hugepage_range. If you add |
| 141 | * any error returns here, do so after setting VM_HUGETLB, so |
| 142 | * is_vm_hugetlb_page tests below unmap_region go the right |
| 143 | * way when do_mmap_pgoff unwinds (may be important on powerpc |
| 144 | * and ia64). |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 145 | */ |
Naoya Horiguchi | a2fce91 | 2013-04-17 15:58:27 -0700 | [diff] [blame] | 146 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 147 | vma->vm_ops = &hugetlb_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Mike Kravetz | 3d101f3 | 2017-04-13 14:56:32 -0700 | [diff] [blame] | 149 | /* |
Mike Kravetz | 447effd | 2018-03-22 16:17:13 -0700 | [diff] [blame] | 150 | * page based offset in vm_pgoff could be sufficiently large to |
Mike Kravetz | 0c82bca | 2018-04-05 16:18:21 -0700 | [diff] [blame] | 151 | * overflow a loff_t when converted to byte offset. This can |
| 152 | * only happen on architectures where sizeof(loff_t) == |
| 153 | * sizeof(unsigned long). So, only check in those instances. |
Mike Kravetz | 3d101f3 | 2017-04-13 14:56:32 -0700 | [diff] [blame] | 154 | */ |
Mike Kravetz | 0c82bca | 2018-04-05 16:18:21 -0700 | [diff] [blame] | 155 | if (sizeof(unsigned long) == sizeof(loff_t)) { |
| 156 | if (vma->vm_pgoff & PGOFF_LOFFT_MAX) |
| 157 | return -EINVAL; |
| 158 | } |
Mike Kravetz | 3d101f3 | 2017-04-13 14:56:32 -0700 | [diff] [blame] | 159 | |
Mike Kravetz | 447effd | 2018-03-22 16:17:13 -0700 | [diff] [blame] | 160 | /* must be huge page aligned */ |
Becky Bruce | 2b37c35 | 2011-07-25 17:11:49 -0700 | [diff] [blame] | 161 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 162 | return -EINVAL; |
| 163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
Mike Kravetz | 3d101f3 | 2017-04-13 14:56:32 -0700 | [diff] [blame] | 165 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
| 166 | /* check for overflow */ |
| 167 | if (len < vma_len) |
| 168 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 170 | inode_lock(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | file_accessed(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | ret = -ENOMEM; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 174 | if (hugetlb_reserve_pages(inode, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 175 | vma->vm_pgoff >> huge_page_order(h), |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 176 | len >> huge_page_shift(h), vma, |
| 177 | vma->vm_flags)) |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 178 | goto out; |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 179 | |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 180 | ret = 0; |
Zhang, Yanmin | b6174df | 2006-07-10 04:44:49 -0700 | [diff] [blame] | 181 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
Mike Kravetz | 3d101f3 | 2017-04-13 14:56:32 -0700 | [diff] [blame] | 182 | i_size_write(inode, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 184 | inode_unlock(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | return ret; |
| 187 | } |
| 188 | |
| 189 | /* |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 190 | * Called under down_write(mmap_sem). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | */ |
| 192 | |
Adrian Bunk | d2ba27e8 | 2007-05-06 14:49:00 -0700 | [diff] [blame] | 193 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | static unsigned long |
| 195 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 196 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 197 | { |
| 198 | struct mm_struct *mm = current->mm; |
| 199 | struct vm_area_struct *vma; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 200 | struct hstate *h = hstate_file(file); |
Michel Lespinasse | 0865935 | 2012-12-11 16:02:00 -0800 | [diff] [blame] | 201 | struct vm_unmapped_area_info info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 203 | if (len & ~huge_page_mask(h)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | return -EINVAL; |
| 205 | if (len > TASK_SIZE) |
| 206 | return -ENOMEM; |
| 207 | |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 208 | if (flags & MAP_FIXED) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 209 | if (prepare_hugepage_range(file, addr, len)) |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 210 | return -EINVAL; |
| 211 | return addr; |
| 212 | } |
| 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | if (addr) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 215 | addr = ALIGN(addr, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | vma = find_vma(mm, addr); |
| 217 | if (TASK_SIZE - len >= addr && |
Hugh Dickins | cfc0eb40 | 2017-06-19 04:03:24 -0700 | [diff] [blame] | 218 | (!vma || addr + len <= vm_start_gap(vma))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | return addr; |
| 220 | } |
| 221 | |
Michel Lespinasse | 0865935 | 2012-12-11 16:02:00 -0800 | [diff] [blame] | 222 | info.flags = 0; |
| 223 | info.length = len; |
| 224 | info.low_limit = TASK_UNMAPPED_BASE; |
| 225 | info.high_limit = TASK_SIZE; |
| 226 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
| 227 | info.align_offset = 0; |
| 228 | return vm_unmapped_area(&info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | #endif |
| 231 | |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 232 | static size_t |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 233 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 234 | struct iov_iter *to, unsigned long size) |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 235 | { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 236 | size_t copied = 0; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 237 | int i, chunksize; |
| 238 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 239 | /* Find which 4k chunk and offset with in that chunk */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 240 | i = offset >> PAGE_SHIFT; |
| 241 | offset = offset & ~PAGE_MASK; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 242 | |
| 243 | while (size) { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 244 | size_t n; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 245 | chunksize = PAGE_SIZE; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 246 | if (offset) |
| 247 | chunksize -= offset; |
| 248 | if (chunksize > size) |
| 249 | chunksize = size; |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 250 | n = copy_page_to_iter(&page[i], offset, chunksize, to); |
| 251 | copied += n; |
| 252 | if (n != chunksize) |
| 253 | return copied; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 254 | offset = 0; |
| 255 | size -= chunksize; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 256 | i++; |
| 257 | } |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 258 | return copied; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 259 | } |
| 260 | |
| 261 | /* |
| 262 | * Support for read() - Find the page attached to f_mapping and copy out the |
| 263 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 264 | * since it has PAGE_SIZE assumptions. |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 265 | */ |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 266 | static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 267 | { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 268 | struct file *file = iocb->ki_filp; |
| 269 | struct hstate *h = hstate_file(file); |
| 270 | struct address_space *mapping = file->f_mapping; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 271 | struct inode *inode = mapping->host; |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 272 | unsigned long index = iocb->ki_pos >> huge_page_shift(h); |
| 273 | unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 274 | unsigned long end_index; |
| 275 | loff_t isize; |
| 276 | ssize_t retval = 0; |
| 277 | |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 278 | while (iov_iter_count(to)) { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 279 | struct page *page; |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 280 | size_t nr, copied; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 281 | |
| 282 | /* nr is the maximum number of bytes to copy from this page */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 283 | nr = huge_page_size(h); |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 284 | isize = i_size_read(inode); |
| 285 | if (!isize) |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 286 | break; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 287 | end_index = (isize - 1) >> huge_page_shift(h); |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 288 | if (index > end_index) |
| 289 | break; |
| 290 | if (index == end_index) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 291 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 292 | if (nr <= offset) |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 293 | break; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 294 | } |
| 295 | nr = nr - offset; |
| 296 | |
| 297 | /* Find the page */ |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 298 | page = find_lock_page(mapping, index); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 299 | if (unlikely(page == NULL)) { |
| 300 | /* |
| 301 | * We have a HOLE, zero out the user-buffer for the |
| 302 | * length of the hole or request. |
| 303 | */ |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 304 | copied = iov_iter_zero(nr, to); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 305 | } else { |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 306 | unlock_page(page); |
| 307 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 308 | /* |
| 309 | * We have the page, copy it to user space buffer. |
| 310 | */ |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 311 | copied = hugetlbfs_read_actor(page, offset, to, nr); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 312 | put_page(page); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 313 | } |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 314 | offset += copied; |
| 315 | retval += copied; |
| 316 | if (copied != nr && iov_iter_count(to)) { |
| 317 | if (!retval) |
| 318 | retval = -EFAULT; |
| 319 | break; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 320 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 321 | index += offset >> huge_page_shift(h); |
| 322 | offset &= ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 323 | } |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 324 | iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 325 | return retval; |
| 326 | } |
| 327 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 328 | static int hugetlbfs_write_begin(struct file *file, |
| 329 | struct address_space *mapping, |
| 330 | loff_t pos, unsigned len, unsigned flags, |
| 331 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | { |
| 333 | return -EINVAL; |
| 334 | } |
| 335 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 336 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
| 337 | loff_t pos, unsigned len, unsigned copied, |
| 338 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 340 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | return -EINVAL; |
| 342 | } |
| 343 | |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 344 | static void remove_huge_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | { |
Konstantin Khlebnikov | b9ea251 | 2015-04-14 15:45:27 -0700 | [diff] [blame] | 346 | ClearPageDirty(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | ClearPageUptodate(page); |
Minchan Kim | bd65cb8 | 2011-03-22 16:30:54 -0700 | [diff] [blame] | 348 | delete_from_page_cache(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
Mike Kravetz | 4aae8d1 | 2016-01-15 16:57:40 -0800 | [diff] [blame] | 351 | static void |
| 352 | hugetlb_vmdelete_list(struct rb_root *root, pgoff_t start, pgoff_t end) |
| 353 | { |
| 354 | struct vm_area_struct *vma; |
| 355 | |
| 356 | /* |
| 357 | * end == 0 indicates that the entire range after |
| 358 | * start should be unmapped. |
| 359 | */ |
| 360 | vma_interval_tree_foreach(vma, root, start, end ? end : ULONG_MAX) { |
| 361 | unsigned long v_offset; |
| 362 | unsigned long v_end; |
| 363 | |
| 364 | /* |
| 365 | * Can the expression below overflow on 32-bit arches? |
| 366 | * No, because the interval tree returns us only those vmas |
| 367 | * which overlap the truncated area starting at pgoff, |
| 368 | * and no vma on a 32-bit arch can span beyond the 4GB. |
| 369 | */ |
| 370 | if (vma->vm_pgoff < start) |
| 371 | v_offset = (start - vma->vm_pgoff) << PAGE_SHIFT; |
| 372 | else |
| 373 | v_offset = 0; |
| 374 | |
| 375 | if (!end) |
| 376 | v_end = vma->vm_end; |
| 377 | else { |
| 378 | v_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) |
| 379 | + vma->vm_start; |
| 380 | if (v_end > vma->vm_end) |
| 381 | v_end = vma->vm_end; |
| 382 | } |
| 383 | |
| 384 | unmap_hugepage_range(vma, vma->vm_start + v_offset, v_end, |
| 385 | NULL); |
| 386 | } |
| 387 | } |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 388 | |
| 389 | /* |
| 390 | * remove_inode_hugepages handles two distinct cases: truncation and hole |
| 391 | * punch. There are subtle differences in operation for each case. |
Mike Kravetz | 4aae8d1 | 2016-01-15 16:57:40 -0800 | [diff] [blame] | 392 | * |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 393 | * truncation is indicated by end of range being LLONG_MAX |
| 394 | * In this case, we first scan the range and release found pages. |
| 395 | * After releasing pages, hugetlb_unreserve_pages cleans up region/reserv |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 396 | * maps and global counts. Page faults can not race with truncation |
| 397 | * in this routine. hugetlb_no_page() prevents page faults in the |
| 398 | * truncated range. It checks i_size before allocation, and again after |
| 399 | * with the page table lock for the page held. The same lock must be |
| 400 | * acquired to unmap a page. |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 401 | * hole punch is indicated if end is not LLONG_MAX |
| 402 | * In the hole punch case we scan the range and release found pages. |
| 403 | * Only when releasing a page is the associated region/reserv map |
| 404 | * deleted. The region/reserv map for ranges without associated |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 405 | * pages are not modified. Page faults can race with hole punch. |
| 406 | * This is indicated if we find a mapped page. |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 407 | * Note: If the passed end of range value is beyond the end of file, but |
| 408 | * not LLONG_MAX this routine still performs a hole punch operation. |
| 409 | */ |
| 410 | static void remove_inode_hugepages(struct inode *inode, loff_t lstart, |
| 411 | loff_t lend) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 413 | struct hstate *h = hstate_inode(inode); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 414 | struct address_space *mapping = &inode->i_data; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 415 | const pgoff_t start = lstart >> huge_page_shift(h); |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 416 | const pgoff_t end = lend >> huge_page_shift(h); |
| 417 | struct vm_area_struct pseudo_vma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct pagevec pvec; |
| 419 | pgoff_t next; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 420 | int i, freed = 0; |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 421 | long lookup_nr = PAGEVEC_SIZE; |
| 422 | bool truncate_op = (lend == LLONG_MAX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 424 | memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); |
| 425 | pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | pagevec_init(&pvec, 0); |
| 427 | next = start; |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 428 | while (next < end) { |
| 429 | /* |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 430 | * Don't grab more pages than the number left in the range. |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 431 | */ |
| 432 | if (end - next < lookup_nr) |
| 433 | lookup_nr = end - next; |
| 434 | |
| 435 | /* |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 436 | * When no more pages are found, we are done. |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 437 | */ |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 438 | if (!pagevec_lookup(&pvec, mapping, next, lookup_nr)) |
| 439 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
| 441 | for (i = 0; i < pagevec_count(&pvec); ++i) { |
| 442 | struct page *page = pvec.pages[i]; |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 443 | u32 hash; |
| 444 | |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 445 | /* |
| 446 | * The page (index) could be beyond end. This is |
| 447 | * only possible in the punch hole case as end is |
| 448 | * max page offset in the truncate case. |
| 449 | */ |
| 450 | next = page->index; |
| 451 | if (next >= end) |
| 452 | break; |
| 453 | |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 454 | hash = hugetlb_fault_mutex_hash(h, current->mm, |
| 455 | &pseudo_vma, |
| 456 | mapping, next, 0); |
| 457 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Mike Kravetz | 4aae8d1 | 2016-01-15 16:57:40 -0800 | [diff] [blame] | 459 | /* |
| 460 | * If page is mapped, it was faulted in after being |
| 461 | * unmapped in caller. Unmap (again) now after taking |
| 462 | * the fault mutex. The mutex will prevent faults |
| 463 | * until we finish removing the page. |
| 464 | * |
| 465 | * This race can only happen in the hole punch case. |
| 466 | * Getting here in a truncate operation is a bug. |
| 467 | */ |
| 468 | if (unlikely(page_mapped(page))) { |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 469 | BUG_ON(truncate_op); |
Mike Kravetz | 4aae8d1 | 2016-01-15 16:57:40 -0800 | [diff] [blame] | 470 | |
| 471 | i_mmap_lock_write(mapping); |
| 472 | hugetlb_vmdelete_list(&mapping->i_mmap, |
| 473 | next * pages_per_huge_page(h), |
| 474 | (next + 1) * pages_per_huge_page(h)); |
| 475 | i_mmap_unlock_write(mapping); |
| 476 | } |
| 477 | |
| 478 | lock_page(page); |
| 479 | /* |
| 480 | * We must free the huge page and remove from page |
| 481 | * cache (remove_huge_page) BEFORE removing the |
| 482 | * region/reserve map (hugetlb_unreserve_pages). In |
| 483 | * rare out of memory conditions, removal of the |
zhong jiang | 72e2936 | 2016-10-07 17:02:01 -0700 | [diff] [blame] | 484 | * region/reserve map could fail. Correspondingly, |
| 485 | * the subpool and global reserve usage count can need |
| 486 | * to be adjusted. |
Mike Kravetz | 4aae8d1 | 2016-01-15 16:57:40 -0800 | [diff] [blame] | 487 | */ |
zhong jiang | 72e2936 | 2016-10-07 17:02:01 -0700 | [diff] [blame] | 488 | VM_BUG_ON(PagePrivate(page)); |
Mike Kravetz | 4aae8d1 | 2016-01-15 16:57:40 -0800 | [diff] [blame] | 489 | remove_huge_page(page); |
| 490 | freed++; |
| 491 | if (!truncate_op) { |
| 492 | if (unlikely(hugetlb_unreserve_pages(inode, |
| 493 | next, next + 1, 1))) |
zhong jiang | 72e2936 | 2016-10-07 17:02:01 -0700 | [diff] [blame] | 494 | hugetlb_fix_reserve_counts(inode); |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 495 | } |
| 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | unlock_page(page); |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 498 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 500 | ++next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | huge_pagevec_release(&pvec); |
Mike Kravetz | 1817889 | 2015-11-20 15:57:13 -0800 | [diff] [blame] | 502 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 504 | |
| 505 | if (truncate_op) |
| 506 | (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 509 | static void hugetlbfs_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | { |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 511 | struct resv_map *resv_map; |
| 512 | |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 513 | remove_inode_hugepages(inode, 0, LLONG_MAX); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 514 | resv_map = (struct resv_map *)inode->i_mapping->private_data; |
| 515 | /* root inode doesn't have the resv_map, so we should check it */ |
| 516 | if (resv_map) |
| 517 | resv_map_release(&resv_map->refs); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 518 | clear_inode(inode); |
Christoph Hellwig | 149f421 | 2005-10-29 18:16:43 -0700 | [diff] [blame] | 519 | } |
| 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
| 522 | { |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 523 | pgoff_t pgoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | struct address_space *mapping = inode->i_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 525 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 527 | BUG_ON(offset & ~huge_page_mask(h)); |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 528 | pgoff = offset >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Ken Chen | 7aa91e1 | 2007-10-16 01:26:21 -0700 | [diff] [blame] | 530 | i_size_write(inode, offset); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 531 | i_mmap_lock_write(mapping); |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 532 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
Mike Kravetz | 1bfad99 | 2015-09-08 15:01:38 -0700 | [diff] [blame] | 533 | hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 534 | i_mmap_unlock_write(mapping); |
Mike Kravetz | b5cec28 | 2015-09-08 15:01:41 -0700 | [diff] [blame] | 535 | remove_inode_hugepages(inode, offset, LLONG_MAX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | return 0; |
| 537 | } |
| 538 | |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 539 | static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) |
| 540 | { |
| 541 | struct hstate *h = hstate_inode(inode); |
| 542 | loff_t hpage_size = huge_page_size(h); |
| 543 | loff_t hole_start, hole_end; |
| 544 | |
| 545 | /* |
| 546 | * For hole punch round up the beginning offset of the hole and |
| 547 | * round down the end. |
| 548 | */ |
| 549 | hole_start = round_up(offset, hpage_size); |
| 550 | hole_end = round_down(offset + len, hpage_size); |
| 551 | |
| 552 | if (hole_end > hole_start) { |
| 553 | struct address_space *mapping = inode->i_mapping; |
| 554 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 555 | inode_lock(inode); |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 556 | i_mmap_lock_write(mapping); |
| 557 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
| 558 | hugetlb_vmdelete_list(&mapping->i_mmap, |
| 559 | hole_start >> PAGE_SHIFT, |
| 560 | hole_end >> PAGE_SHIFT); |
| 561 | i_mmap_unlock_write(mapping); |
| 562 | remove_inode_hugepages(inode, hole_start, hole_end); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 563 | inode_unlock(inode); |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, |
| 570 | loff_t len) |
| 571 | { |
| 572 | struct inode *inode = file_inode(file); |
| 573 | struct address_space *mapping = inode->i_mapping; |
| 574 | struct hstate *h = hstate_inode(inode); |
| 575 | struct vm_area_struct pseudo_vma; |
| 576 | struct mm_struct *mm = current->mm; |
| 577 | loff_t hpage_size = huge_page_size(h); |
| 578 | unsigned long hpage_shift = huge_page_shift(h); |
| 579 | pgoff_t start, index, end; |
| 580 | int error; |
| 581 | u32 hash; |
| 582 | |
| 583 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
| 584 | return -EOPNOTSUPP; |
| 585 | |
| 586 | if (mode & FALLOC_FL_PUNCH_HOLE) |
| 587 | return hugetlbfs_punch_hole(inode, offset, len); |
| 588 | |
| 589 | /* |
| 590 | * Default preallocate case. |
| 591 | * For this range, start is rounded down and end is rounded up |
| 592 | * as well as being converted to page offsets. |
| 593 | */ |
| 594 | start = offset >> hpage_shift; |
| 595 | end = (offset + len + hpage_size - 1) >> hpage_shift; |
| 596 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 597 | inode_lock(inode); |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 598 | |
| 599 | /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ |
| 600 | error = inode_newsize_ok(inode, offset + len); |
| 601 | if (error) |
| 602 | goto out; |
| 603 | |
| 604 | /* |
| 605 | * Initialize a pseudo vma as this is required by the huge page |
| 606 | * allocation routines. If NUMA is configured, use page index |
| 607 | * as input to create an allocation policy. |
| 608 | */ |
| 609 | memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); |
| 610 | pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); |
| 611 | pseudo_vma.vm_file = file; |
| 612 | |
| 613 | for (index = start; index < end; index++) { |
| 614 | /* |
| 615 | * This is supposed to be the vaddr where the page is being |
| 616 | * faulted in, but we have no vaddr here. |
| 617 | */ |
| 618 | struct page *page; |
| 619 | unsigned long addr; |
| 620 | int avoid_reserve = 0; |
| 621 | |
| 622 | cond_resched(); |
| 623 | |
| 624 | /* |
| 625 | * fallocate(2) manpage permits EINTR; we may have been |
| 626 | * interrupted because we are using up too much memory. |
| 627 | */ |
| 628 | if (signal_pending(current)) { |
| 629 | error = -EINTR; |
| 630 | break; |
| 631 | } |
| 632 | |
| 633 | /* Set numa allocation policy based on index */ |
| 634 | hugetlb_set_vma_policy(&pseudo_vma, inode, index); |
| 635 | |
| 636 | /* addr is the offset within the file (zero based) */ |
| 637 | addr = index * hpage_size; |
| 638 | |
| 639 | /* mutex taken here, fault path and hole punch */ |
| 640 | hash = hugetlb_fault_mutex_hash(h, mm, &pseudo_vma, mapping, |
| 641 | index, addr); |
| 642 | mutex_lock(&hugetlb_fault_mutex_table[hash]); |
| 643 | |
| 644 | /* See if already present in mapping to avoid alloc/free */ |
| 645 | page = find_get_page(mapping, index); |
| 646 | if (page) { |
| 647 | put_page(page); |
| 648 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
| 649 | hugetlb_drop_vma_policy(&pseudo_vma); |
| 650 | continue; |
| 651 | } |
| 652 | |
| 653 | /* Allocate page and add to page cache */ |
| 654 | page = alloc_huge_page(&pseudo_vma, addr, avoid_reserve); |
| 655 | hugetlb_drop_vma_policy(&pseudo_vma); |
| 656 | if (IS_ERR(page)) { |
| 657 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
| 658 | error = PTR_ERR(page); |
| 659 | goto out; |
| 660 | } |
| 661 | clear_huge_page(page, addr, pages_per_huge_page(h)); |
| 662 | __SetPageUptodate(page); |
| 663 | error = huge_add_to_page_cache(page, mapping, index); |
| 664 | if (unlikely(error)) { |
| 665 | put_page(page); |
| 666 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
| 667 | goto out; |
| 668 | } |
| 669 | |
| 670 | mutex_unlock(&hugetlb_fault_mutex_table[hash]); |
| 671 | |
| 672 | /* |
| 673 | * page_put due to reference from alloc_huge_page() |
| 674 | * unlock_page because locked by add_to_page_cache() |
| 675 | */ |
| 676 | put_page(page); |
| 677 | unlock_page(page); |
| 678 | } |
| 679 | |
| 680 | if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) |
| 681 | i_size_write(inode, offset + len); |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 682 | inode->i_ctime = current_time(inode); |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 683 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 684 | inode_unlock(inode); |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 685 | return error; |
| 686 | } |
| 687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 689 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 690 | struct inode *inode = d_inode(dentry); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 691 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | int error; |
| 693 | unsigned int ia_valid = attr->ia_valid; |
| 694 | |
| 695 | BUG_ON(!inode); |
| 696 | |
Jan Kara | 31051c8 | 2016-05-26 16:55:18 +0200 | [diff] [blame] | 697 | error = setattr_prepare(dentry, attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 699 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
| 701 | if (ia_valid & ATTR_SIZE) { |
| 702 | error = -EINVAL; |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 703 | if (attr->ia_size & ~huge_page_mask(h)) |
| 704 | return -EINVAL; |
| 705 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 707 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 709 | |
| 710 | setattr_copy(inode, attr); |
| 711 | mark_inode_dirty(inode); |
| 712 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
| 714 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 715 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
| 716 | struct hugetlbfs_config *config) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | { |
| 718 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | inode = new_inode(sb); |
| 721 | if (inode) { |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 722 | inode->i_ino = get_next_ino(); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 723 | inode->i_mode = S_IFDIR | config->mode; |
| 724 | inode->i_uid = config->uid; |
| 725 | inode->i_gid = config->gid; |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 726 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 727 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 728 | inode->i_fop = &simple_dir_operations; |
| 729 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
| 730 | inc_nlink(inode); |
Aneesh Kumar K.V | 65ed760 | 2012-04-25 16:01:50 -0700 | [diff] [blame] | 731 | lockdep_annotate_inode_mutex_key(inode); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 732 | } |
| 733 | return inode; |
| 734 | } |
| 735 | |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 736 | /* |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 737 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 738 | * be taken from reclaim -- unlike regular filesystems. This needs an |
Kirill A. Shutemov | 88f306b | 2016-01-15 16:57:31 -0800 | [diff] [blame] | 739 | * annotation because huge_pmd_share() does an allocation under hugetlb's |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 740 | * i_mmap_rwsem. |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 741 | */ |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 742 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 743 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 744 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
| 745 | struct inode *dir, |
Al Viro | 18df225 | 2011-07-24 23:17:40 -0400 | [diff] [blame] | 746 | umode_t mode, dev_t dev) |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 747 | { |
| 748 | struct inode *inode; |
Mike Kravetz | d57e4ae | 2019-04-05 18:39:06 -0700 | [diff] [blame^] | 749 | struct resv_map *resv_map = NULL; |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 750 | |
Mike Kravetz | d57e4ae | 2019-04-05 18:39:06 -0700 | [diff] [blame^] | 751 | /* |
| 752 | * Reserve maps are only needed for inodes that can have associated |
| 753 | * page allocations. |
| 754 | */ |
| 755 | if (S_ISREG(mode) || S_ISLNK(mode)) { |
| 756 | resv_map = resv_map_alloc(); |
| 757 | if (!resv_map) |
| 758 | return NULL; |
| 759 | } |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 760 | |
| 761 | inode = new_inode(sb); |
| 762 | if (inode) { |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 763 | inode->i_ino = get_next_ino(); |
| 764 | inode_init_owner(inode, dir, mode); |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 765 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
| 766 | &hugetlbfs_i_mmap_rwsem_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 768 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 769 | inode->i_mapping->private_data = resv_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | switch (mode & S_IFMT) { |
| 771 | default: |
| 772 | init_special_inode(inode, mode, dev); |
| 773 | break; |
| 774 | case S_IFREG: |
| 775 | inode->i_op = &hugetlbfs_inode_operations; |
| 776 | inode->i_fop = &hugetlbfs_file_operations; |
| 777 | break; |
| 778 | case S_IFDIR: |
| 779 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 780 | inode->i_fop = &simple_dir_operations; |
| 781 | |
| 782 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 783 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | break; |
| 785 | case S_IFLNK: |
| 786 | inode->i_op = &page_symlink_inode_operations; |
Al Viro | 21fc61c | 2015-11-17 01:07:57 -0500 | [diff] [blame] | 787 | inode_nohighmem(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | break; |
| 789 | } |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 790 | lockdep_annotate_inode_mutex_key(inode); |
Mike Kravetz | d57e4ae | 2019-04-05 18:39:06 -0700 | [diff] [blame^] | 791 | } else { |
| 792 | if (resv_map) |
| 793 | kref_put(&resv_map->refs, resv_map_release); |
| 794 | } |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 795 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | return inode; |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * File creation. Allocate an inode, and we're done.. |
| 801 | */ |
| 802 | static int hugetlbfs_mknod(struct inode *dir, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 803 | struct dentry *dentry, umode_t mode, dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
| 805 | struct inode *inode; |
| 806 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 808 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | if (inode) { |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 810 | dir->i_ctime = dir->i_mtime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | d_instantiate(dentry, inode); |
| 812 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 813 | error = 0; |
| 814 | } |
| 815 | return error; |
| 816 | } |
| 817 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 818 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | { |
| 820 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); |
| 821 | if (!retval) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 822 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | return retval; |
| 824 | } |
| 825 | |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 826 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
| 828 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); |
| 829 | } |
| 830 | |
| 831 | static int hugetlbfs_symlink(struct inode *dir, |
| 832 | struct dentry *dentry, const char *symname) |
| 833 | { |
| 834 | struct inode *inode; |
| 835 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 837 | inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | if (inode) { |
| 839 | int l = strlen(symname)+1; |
| 840 | error = page_symlink(inode, symname, l); |
| 841 | if (!error) { |
| 842 | d_instantiate(dentry, inode); |
| 843 | dget(dentry); |
| 844 | } else |
| 845 | iput(inode); |
| 846 | } |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 847 | dir->i_ctime = dir->i_mtime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | return error; |
| 850 | } |
| 851 | |
| 852 | /* |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 853 | * mark the head page dirty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | */ |
| 855 | static int hugetlbfs_set_page_dirty(struct page *page) |
| 856 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 857 | struct page *head = compound_head(page); |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 858 | |
| 859 | SetPageDirty(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | return 0; |
| 861 | } |
| 862 | |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 863 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 864 | struct page *newpage, struct page *page, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 865 | enum migrate_mode mode) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 866 | { |
| 867 | int rc; |
| 868 | |
| 869 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); |
Rafael Aquini | 78bd520 | 2012-12-11 16:02:31 -0800 | [diff] [blame] | 870 | if (rc != MIGRATEPAGE_SUCCESS) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 871 | return rc; |
Mike Kravetz | b010e03 | 2019-02-28 16:22:02 -0800 | [diff] [blame] | 872 | |
| 873 | /* |
| 874 | * page_private is subpool pointer in hugetlb pages. Transfer to |
| 875 | * new page. PagePrivate is not associated with page_private for |
| 876 | * hugetlb pages and can not be set here as only page_huge_active |
| 877 | * pages can be migrated. |
| 878 | */ |
| 879 | if (page_private(page)) { |
| 880 | set_page_private(newpage, page_private(page)); |
| 881 | set_page_private(page, 0); |
| 882 | } |
| 883 | |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 884 | migrate_page_copy(newpage, page); |
| 885 | |
Rafael Aquini | 78bd520 | 2012-12-11 16:02:31 -0800 | [diff] [blame] | 886 | return MIGRATEPAGE_SUCCESS; |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 887 | } |
| 888 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 889 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 891 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 892 | struct hstate *h = hstate_inode(d_inode(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
| 894 | buf->f_type = HUGETLBFS_MAGIC; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 895 | buf->f_bsize = huge_page_size(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | if (sbinfo) { |
| 897 | spin_lock(&sbinfo->stat_lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 898 | /* If no limits set, just report 0 for max/free/used |
| 899 | * blocks, like simple_statfs() */ |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 900 | if (sbinfo->spool) { |
| 901 | long free_pages; |
| 902 | |
| 903 | spin_lock(&sbinfo->spool->lock); |
| 904 | buf->f_blocks = sbinfo->spool->max_hpages; |
| 905 | free_pages = sbinfo->spool->max_hpages |
| 906 | - sbinfo->spool->used_hpages; |
| 907 | buf->f_bavail = buf->f_bfree = free_pages; |
| 908 | spin_unlock(&sbinfo->spool->lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 909 | buf->f_files = sbinfo->max_inodes; |
| 910 | buf->f_ffree = sbinfo->free_inodes; |
| 911 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | spin_unlock(&sbinfo->stat_lock); |
| 913 | } |
| 914 | buf->f_namelen = NAME_MAX; |
| 915 | return 0; |
| 916 | } |
| 917 | |
| 918 | static void hugetlbfs_put_super(struct super_block *sb) |
| 919 | { |
| 920 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); |
| 921 | |
| 922 | if (sbi) { |
| 923 | sb->s_fs_info = NULL; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 924 | |
| 925 | if (sbi->spool) |
| 926 | hugepage_put_subpool(sbi->spool); |
| 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | kfree(sbi); |
| 929 | } |
| 930 | } |
| 931 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 932 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 933 | { |
| 934 | if (sbinfo->free_inodes >= 0) { |
| 935 | spin_lock(&sbinfo->stat_lock); |
| 936 | if (unlikely(!sbinfo->free_inodes)) { |
| 937 | spin_unlock(&sbinfo->stat_lock); |
| 938 | return 0; |
| 939 | } |
| 940 | sbinfo->free_inodes--; |
| 941 | spin_unlock(&sbinfo->stat_lock); |
| 942 | } |
| 943 | |
| 944 | return 1; |
| 945 | } |
| 946 | |
| 947 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 948 | { |
| 949 | if (sbinfo->free_inodes >= 0) { |
| 950 | spin_lock(&sbinfo->stat_lock); |
| 951 | sbinfo->free_inodes++; |
| 952 | spin_unlock(&sbinfo->stat_lock); |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 957 | static struct kmem_cache *hugetlbfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
| 959 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) |
| 960 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 961 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | struct hugetlbfs_inode_info *p; |
| 963 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 964 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | return NULL; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 966 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 967 | if (unlikely(!p)) { |
| 968 | hugetlbfs_inc_free_inodes(sbinfo); |
| 969 | return NULL; |
| 970 | } |
Mike Kravetz | dd96407 | 2017-03-31 15:12:01 -0700 | [diff] [blame] | 971 | |
| 972 | /* |
| 973 | * Any time after allocation, hugetlbfs_destroy_inode can be called |
| 974 | * for the inode. mpol_free_shared_policy is unconditionally called |
| 975 | * as part of hugetlbfs_destroy_inode. So, initialize policy here |
| 976 | * in case of a quick call to destroy. |
| 977 | * |
| 978 | * Note that the policy is initialized even if we are creating a |
| 979 | * private inode. This simplifies hugetlbfs_destroy_inode. |
| 980 | */ |
| 981 | mpol_shared_policy_init(&p->policy, NULL); |
| 982 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | return &p->vfs_inode; |
| 984 | } |
| 985 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 986 | static void hugetlbfs_i_callback(struct rcu_head *head) |
| 987 | { |
| 988 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 989 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
| 990 | } |
| 991 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | static void hugetlbfs_destroy_inode(struct inode *inode) |
| 993 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 994 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 996 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 999 | static const struct address_space_operations hugetlbfs_aops = { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 1000 | .write_begin = hugetlbfs_write_begin, |
| 1001 | .write_end = hugetlbfs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | .set_page_dirty = hugetlbfs_set_page_dirty, |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 1003 | .migratepage = hugetlbfs_migrate_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | }; |
| 1005 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 1006 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1007 | static void init_once(void *foo) |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 1008 | { |
| 1009 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; |
| 1010 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 1011 | inode_init_once(&ei->vfs_inode); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 1012 | } |
| 1013 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1014 | const struct file_operations hugetlbfs_file_operations = { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 1015 | .read_iter = hugetlbfs_read_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | .mmap = hugetlbfs_file_mmap, |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 1017 | .fsync = noop_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | .get_unmapped_area = hugetlb_get_unmapped_area, |
Mike Kravetz | 70c3547 | 2015-09-08 15:01:54 -0700 | [diff] [blame] | 1019 | .llseek = default_llseek, |
| 1020 | .fallocate = hugetlbfs_fallocate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | }; |
| 1022 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 1023 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | .create = hugetlbfs_create, |
| 1025 | .lookup = simple_lookup, |
| 1026 | .link = simple_link, |
| 1027 | .unlink = simple_unlink, |
| 1028 | .symlink = hugetlbfs_symlink, |
| 1029 | .mkdir = hugetlbfs_mkdir, |
| 1030 | .rmdir = simple_rmdir, |
| 1031 | .mknod = hugetlbfs_mknod, |
| 1032 | .rename = simple_rename, |
| 1033 | .setattr = hugetlbfs_setattr, |
| 1034 | }; |
| 1035 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 1036 | static const struct inode_operations hugetlbfs_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | .setattr = hugetlbfs_setattr, |
| 1038 | }; |
| 1039 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 1040 | static const struct super_operations hugetlbfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | .alloc_inode = hugetlbfs_alloc_inode, |
| 1042 | .destroy_inode = hugetlbfs_destroy_inode, |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 1043 | .evict_inode = hugetlbfs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | .statfs = hugetlbfs_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | .put_super = hugetlbfs_put_super, |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 1046 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | }; |
| 1048 | |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1049 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT }; |
| 1050 | |
| 1051 | /* |
| 1052 | * Convert size option passed from command line to number of huge pages |
| 1053 | * in the pool specified by hstate. Size option could be in bytes |
| 1054 | * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT). |
| 1055 | */ |
| 1056 | static long long |
| 1057 | hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt, |
| 1058 | int val_type) |
| 1059 | { |
| 1060 | if (val_type == NO_SIZE) |
| 1061 | return -1; |
| 1062 | |
| 1063 | if (val_type == SIZE_PERCENT) { |
| 1064 | size_opt <<= huge_page_shift(h); |
| 1065 | size_opt *= h->max_huge_pages; |
| 1066 | do_div(size_opt, 100); |
| 1067 | } |
| 1068 | |
| 1069 | size_opt >>= huge_page_shift(h); |
| 1070 | return size_opt; |
| 1071 | } |
| 1072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | static int |
| 1074 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) |
| 1075 | { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1076 | char *p, *rest; |
| 1077 | substring_t args[MAX_OPT_ARGS]; |
| 1078 | int option; |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1079 | unsigned long long max_size_opt = 0, min_size_opt = 0; |
| 1080 | int max_val_type = NO_SIZE, min_val_type = NO_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
| 1082 | if (!options) |
| 1083 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1085 | while ((p = strsep(&options, ",")) != NULL) { |
| 1086 | int token; |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 1087 | if (!*p) |
| 1088 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1090 | token = match_token(p, tokens, args); |
| 1091 | switch (token) { |
| 1092 | case Opt_uid: |
| 1093 | if (match_int(&args[0], &option)) |
| 1094 | goto bad_val; |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 1095 | pconfig->uid = make_kuid(current_user_ns(), option); |
| 1096 | if (!uid_valid(pconfig->uid)) |
| 1097 | goto bad_val; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1098 | break; |
| 1099 | |
| 1100 | case Opt_gid: |
| 1101 | if (match_int(&args[0], &option)) |
| 1102 | goto bad_val; |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 1103 | pconfig->gid = make_kgid(current_user_ns(), option); |
| 1104 | if (!gid_valid(pconfig->gid)) |
| 1105 | goto bad_val; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1106 | break; |
| 1107 | |
| 1108 | case Opt_mode: |
| 1109 | if (match_octal(&args[0], &option)) |
| 1110 | goto bad_val; |
Ken Chen | 75897d6 | 2008-02-04 22:28:36 -0800 | [diff] [blame] | 1111 | pconfig->mode = option & 01777U; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1112 | break; |
| 1113 | |
| 1114 | case Opt_size: { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1115 | /* memparse() will accept a K/M/G without a digit */ |
| 1116 | if (!isdigit(*args[0].from)) |
| 1117 | goto bad_val; |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1118 | max_size_opt = memparse(args[0].from, &rest); |
| 1119 | max_val_type = SIZE_STD; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1120 | if (*rest == '%') |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1121 | max_val_type = SIZE_PERCENT; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1122 | break; |
| 1123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1125 | case Opt_nr_inodes: |
| 1126 | /* memparse() will accept a K/M/G without a digit */ |
| 1127 | if (!isdigit(*args[0].from)) |
| 1128 | goto bad_val; |
| 1129 | pconfig->nr_inodes = memparse(args[0].from, &rest); |
| 1130 | break; |
| 1131 | |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1132 | case Opt_pagesize: { |
| 1133 | unsigned long ps; |
| 1134 | ps = memparse(args[0].from, &rest); |
| 1135 | pconfig->hstate = size_to_hstate(ps); |
| 1136 | if (!pconfig->hstate) { |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1137 | pr_err("Unsupported page size %lu MB\n", |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1138 | ps >> 20); |
| 1139 | return -EINVAL; |
| 1140 | } |
| 1141 | break; |
| 1142 | } |
| 1143 | |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1144 | case Opt_min_size: { |
| 1145 | /* memparse() will accept a K/M/G without a digit */ |
| 1146 | if (!isdigit(*args[0].from)) |
| 1147 | goto bad_val; |
| 1148 | min_size_opt = memparse(args[0].from, &rest); |
| 1149 | min_val_type = SIZE_STD; |
| 1150 | if (*rest == '%') |
| 1151 | min_val_type = SIZE_PERCENT; |
| 1152 | break; |
| 1153 | } |
| 1154 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1155 | default: |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1156 | pr_err("Bad mount option: \"%s\"\n", p); |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 1157 | return -EINVAL; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1158 | break; |
| 1159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | } |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1161 | |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1162 | /* |
| 1163 | * Use huge page pool size (in hstate) to convert the size |
| 1164 | * options to number of huge pages. If NO_SIZE, -1 is returned. |
| 1165 | */ |
| 1166 | pconfig->max_hpages = hugetlbfs_size_to_hpages(pconfig->hstate, |
| 1167 | max_size_opt, max_val_type); |
| 1168 | pconfig->min_hpages = hugetlbfs_size_to_hpages(pconfig->hstate, |
| 1169 | min_size_opt, min_val_type); |
| 1170 | |
| 1171 | /* |
| 1172 | * If max_size was specified, then min_size must be smaller |
| 1173 | */ |
| 1174 | if (max_val_type > NO_SIZE && |
| 1175 | pconfig->min_hpages > pconfig->max_hpages) { |
| 1176 | pr_err("minimum size can not be greater than maximum size\n"); |
| 1177 | return -EINVAL; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | return 0; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 1181 | |
| 1182 | bad_val: |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1183 | pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); |
Akinobu Mita | c12ddba | 2009-04-21 12:24:05 -0700 | [diff] [blame] | 1184 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | } |
| 1186 | |
| 1187 | static int |
| 1188 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) |
| 1189 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | int ret; |
| 1191 | struct hugetlbfs_config config; |
| 1192 | struct hugetlbfs_sb_info *sbinfo; |
| 1193 | |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 1194 | save_mount_options(sb, data); |
| 1195 | |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1196 | config.max_hpages = -1; /* No limit on size by default */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | config.nr_inodes = -1; /* No limit on number of inodes by default */ |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 1198 | config.uid = current_fsuid(); |
| 1199 | config.gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | config.mode = 0755; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1201 | config.hstate = &default_hstate; |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1202 | config.min_hpages = -1; /* No default minimum size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | ret = hugetlbfs_parse_options(data, &config); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | if (ret) |
| 1205 | return ret; |
| 1206 | |
| 1207 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
| 1208 | if (!sbinfo) |
| 1209 | return -ENOMEM; |
| 1210 | sb->s_fs_info = sbinfo; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1211 | sbinfo->hstate = config.hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | spin_lock_init(&sbinfo->stat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | sbinfo->max_inodes = config.nr_inodes; |
| 1214 | sbinfo->free_inodes = config.nr_inodes; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 1215 | sbinfo->spool = NULL; |
Mike Kravetz | 7ca02d0 | 2015-04-15 16:13:42 -0700 | [diff] [blame] | 1216 | /* |
| 1217 | * Allocate and initialize subpool if maximum or minimum size is |
| 1218 | * specified. Any needed reservations (for minimim size) are taken |
| 1219 | * taken when the subpool is created. |
| 1220 | */ |
| 1221 | if (config.max_hpages != -1 || config.min_hpages != -1) { |
| 1222 | sbinfo->spool = hugepage_new_subpool(config.hstate, |
| 1223 | config.max_hpages, |
| 1224 | config.min_hpages); |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 1225 | if (!sbinfo->spool) |
| 1226 | goto out_free; |
| 1227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1229 | sb->s_blocksize = huge_page_size(config.hstate); |
| 1230 | sb->s_blocksize_bits = huge_page_shift(config.hstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | sb->s_magic = HUGETLBFS_MAGIC; |
| 1232 | sb->s_op = &hugetlbfs_ops; |
| 1233 | sb->s_time_gran = 1; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 1234 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
| 1235 | if (!sb->s_root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | return 0; |
| 1238 | out_free: |
Fabian Frederick | 6e6870d | 2014-06-04 16:10:40 -0700 | [diff] [blame] | 1239 | kfree(sbinfo->spool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | kfree(sbinfo); |
| 1241 | return -ENOMEM; |
| 1242 | } |
| 1243 | |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1244 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
| 1245 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | { |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1247 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
| 1249 | |
| 1250 | static struct file_system_type hugetlbfs_fs_type = { |
| 1251 | .name = "hugetlbfs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1252 | .mount = hugetlbfs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | .kill_sb = kill_litter_super, |
| 1254 | }; |
| 1255 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1256 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 1258 | static int can_do_hugetlb_shm(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | { |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 1260 | kgid_t shm_group; |
| 1261 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); |
| 1262 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | } |
| 1264 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1265 | static int get_hstate_idx(int page_size_log) |
| 1266 | { |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 1267 | struct hstate *h = hstate_sizelog(page_size_log); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1268 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1269 | if (!h) |
| 1270 | return -1; |
| 1271 | return h - hstates; |
| 1272 | } |
| 1273 | |
Fabian Frederick | be1d2cf | 2014-06-04 16:10:39 -0700 | [diff] [blame] | 1274 | static const struct dentry_operations anon_ops = { |
Al Viro | 118b230 | 2013-08-24 12:08:17 -0400 | [diff] [blame] | 1275 | .d_dname = simple_dname |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 1276 | }; |
| 1277 | |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 1278 | /* |
| 1279 | * Note that size should be aligned to proper hugepage size in caller side, |
| 1280 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. |
| 1281 | */ |
| 1282 | struct file *hugetlb_file_setup(const char *name, size_t size, |
| 1283 | vm_flags_t acctflag, struct user_struct **user, |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1284 | int creat_flags, int page_size_log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | { |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1286 | struct file *file = ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | struct inode *inode; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1288 | struct path path; |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 1289 | struct super_block *sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | struct qstr quick_string; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1291 | int hstate_idx; |
| 1292 | |
| 1293 | hstate_idx = get_hstate_idx(page_size_log); |
| 1294 | if (hstate_idx < 0) |
| 1295 | return ERR_PTR(-ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1297 | *user = NULL; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1298 | if (!hugetlbfs_vfsmount[hstate_idx]) |
Akinobu Mita | 5bc9859 | 2007-05-06 14:50:18 -0700 | [diff] [blame] | 1299 | return ERR_PTR(-ENOENT); |
| 1300 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 1301 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1302 | *user = current_user(); |
| 1303 | if (user_shm_lock(size, *user)) { |
David Rientjes | 21a3c27 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 1304 | task_lock(current); |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1305 | pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", |
David Rientjes | 21a3c27 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 1306 | current->comm, current->pid); |
| 1307 | task_unlock(current); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1308 | } else { |
| 1309 | *user = NULL; |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 1310 | return ERR_PTR(-EPERM); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1311 | } |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 1312 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 1314 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
Eric W. Biederman | 9d66586 | 2007-06-16 10:16:16 -0700 | [diff] [blame] | 1315 | quick_string.name = name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | quick_string.len = strlen(quick_string.name); |
| 1317 | quick_string.hash = 0; |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 1318 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1319 | if (!path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | goto out_shm_unlock; |
| 1321 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 1322 | d_set_d_op(path.dentry, &anon_ops); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1323 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1324 | file = ERR_PTR(-ENOSPC); |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 1325 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | if (!inode) |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 1327 | goto out_dentry; |
Stephen Smalley | e1832f2 | 2015-08-06 15:46:55 -0700 | [diff] [blame] | 1328 | if (creat_flags == HUGETLB_SHMFS_INODE) |
| 1329 | inode->i_flags |= S_PRIVATE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1331 | file = ERR_PTR(-ENOMEM); |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 1332 | if (hugetlb_reserve_pages(inode, 0, |
| 1333 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
| 1334 | acctflag)) |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 1335 | goto out_inode; |
| 1336 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1337 | d_instantiate(path.dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | inode->i_size = size; |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 1339 | clear_nlink(inode); |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 1340 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1341 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 1342 | &hugetlbfs_file_operations); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1343 | if (IS_ERR(file)) |
Al Viro | b4d232e | 2008-02-23 05:59:19 -0500 | [diff] [blame] | 1344 | goto out_dentry; /* inode is already attached */ |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 1345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | return file; |
| 1347 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 1348 | out_inode: |
| 1349 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | out_dentry: |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1351 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | out_shm_unlock: |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1353 | if (*user) { |
| 1354 | user_shm_unlock(size, *user); |
| 1355 | *user = NULL; |
| 1356 | } |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1357 | return file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | } |
| 1359 | |
| 1360 | static int __init init_hugetlbfs_fs(void) |
| 1361 | { |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1362 | struct hstate *h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | int error; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1364 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 1366 | if (!hugepages_supported()) { |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1367 | pr_info("disabling because there are no supported hugepage sizes\n"); |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 1368 | return -ENOTSUPP; |
| 1369 | } |
| 1370 | |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1371 | error = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
| 1373 | sizeof(struct hugetlbfs_inode_info), |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 1374 | 0, SLAB_ACCOUNT, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | if (hugetlbfs_inode_cachep == NULL) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1376 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
| 1378 | error = register_filesystem(&hugetlbfs_fs_type); |
| 1379 | if (error) |
| 1380 | goto out; |
| 1381 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1382 | i = 0; |
| 1383 | for_each_hstate(h) { |
| 1384 | char buf[50]; |
| 1385 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1387 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
| 1388 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, |
| 1389 | buf); |
| 1390 | |
| 1391 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1392 | pr_err("Cannot mount internal hugetlbfs for " |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1393 | "page size %uK", ps_kb); |
| 1394 | error = PTR_ERR(hugetlbfs_vfsmount[i]); |
| 1395 | hugetlbfs_vfsmount[i] = NULL; |
| 1396 | } |
| 1397 | i++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | } |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1399 | /* Non default hstates are optional */ |
| 1400 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) |
| 1401 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | |
| 1403 | out: |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1404 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1405 | out2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | return error; |
| 1407 | } |
Paul Gortmaker | 3e89e1c | 2016-01-14 15:21:52 -0800 | [diff] [blame] | 1408 | fs_initcall(init_hugetlbfs_fs) |