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. |
| 7 | */ |
| 8 | |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/thread_info.h> |
| 13 | #include <asm/current.h> |
| 14 | #include <linux/sched.h> /* remove ASAP */ |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/mount.h> |
| 17 | #include <linux/file.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 24 | #include <linux/capability.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 25 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/backing-dev.h> |
| 27 | #include <linux/hugetlb.h> |
| 28 | #include <linux/pagevec.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 29 | #include <linux/parser.h> |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 30 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/slab.h> |
| 32 | #include <linux/dnotify.h> |
| 33 | #include <linux/statfs.h> |
| 34 | #include <linux/security.h> |
Nick Black | 1fd7317d | 2009-09-22 16:43:33 -0700 | [diff] [blame] | 35 | #include <linux/magic.h> |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 36 | #include <linux/migrate.h> |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 37 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #include <asm/uaccess.h> |
| 40 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 41 | static const struct super_operations hugetlbfs_ops; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 42 | static const struct address_space_operations hugetlbfs_aops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 43 | const struct file_operations hugetlbfs_file_operations; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 44 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
| 45 | static const struct inode_operations hugetlbfs_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 47 | struct hugetlbfs_config { |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 48 | kuid_t uid; |
| 49 | kgid_t gid; |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 50 | umode_t mode; |
| 51 | long nr_blocks; |
| 52 | long nr_inodes; |
| 53 | struct hstate *hstate; |
| 54 | }; |
| 55 | |
| 56 | struct hugetlbfs_inode_info { |
| 57 | struct shared_policy policy; |
| 58 | struct inode vfs_inode; |
| 59 | }; |
| 60 | |
| 61 | static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) |
| 62 | { |
| 63 | return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); |
| 64 | } |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | int sysctl_hugetlb_shm_group; |
| 67 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 68 | enum { |
| 69 | Opt_size, Opt_nr_inodes, |
| 70 | Opt_mode, Opt_uid, Opt_gid, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 71 | Opt_pagesize, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 72 | Opt_err, |
| 73 | }; |
| 74 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 75 | static const match_table_t tokens = { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 76 | {Opt_size, "size=%s"}, |
| 77 | {Opt_nr_inodes, "nr_inodes=%s"}, |
| 78 | {Opt_mode, "mode=%o"}, |
| 79 | {Opt_uid, "uid=%u"}, |
| 80 | {Opt_gid, "gid=%u"}, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 81 | {Opt_pagesize, "pagesize=%s"}, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 82 | {Opt_err, NULL}, |
| 83 | }; |
| 84 | |
Adam Litke | 2e9b367 | 2005-10-29 18:16:47 -0700 | [diff] [blame] | 85 | static void huge_pagevec_release(struct pagevec *pvec) |
| 86 | { |
| 87 | int i; |
| 88 | |
| 89 | for (i = 0; i < pagevec_count(pvec); ++i) |
| 90 | put_page(pvec->pages[i]); |
| 91 | |
| 92 | pagevec_reinit(pvec); |
| 93 | } |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 96 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 97 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | loff_t len, vma_len; |
| 99 | int ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 100 | struct hstate *h = hstate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 102 | /* |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 103 | * vma address alignment (but not the pgoff alignment) has |
| 104 | * already been checked by prepare_hugepage_range. If you add |
| 105 | * any error returns here, do so after setting VM_HUGETLB, so |
| 106 | * is_vm_hugetlb_page tests below unmap_region go the right |
| 107 | * way when do_mmap_pgoff unwinds (may be important on powerpc |
| 108 | * and ia64). |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 109 | */ |
Naoya Horiguchi | a2fce91 | 2013-04-17 15:58:27 -0700 | [diff] [blame] | 110 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 111 | vma->vm_ops = &hugetlb_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Becky Bruce | 2b37c35 | 2011-07-25 17:11:49 -0700 | [diff] [blame] | 113 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 114 | return -EINVAL; |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
| 117 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 118 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | file_accessed(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | ret = -ENOMEM; |
| 122 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 124 | if (hugetlb_reserve_pages(inode, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 125 | vma->vm_pgoff >> huge_page_order(h), |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 126 | len >> huge_page_shift(h), vma, |
| 127 | vma->vm_flags)) |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 128 | goto out; |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 129 | |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 130 | ret = 0; |
| 131 | hugetlb_prefault_arch_hook(vma->vm_mm); |
Zhang, Yanmin | b6174df | 2006-07-10 04:44:49 -0700 | [diff] [blame] | 132 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | inode->i_size = len; |
| 134 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 135 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | /* |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 141 | * Called under down_write(mmap_sem). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | */ |
| 143 | |
Adrian Bunk | d2ba27e8 | 2007-05-06 14:49:00 -0700 | [diff] [blame] | 144 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | static unsigned long |
| 146 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 147 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 148 | { |
| 149 | struct mm_struct *mm = current->mm; |
| 150 | struct vm_area_struct *vma; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 151 | struct hstate *h = hstate_file(file); |
Michel Lespinasse | 0865935 | 2012-12-11 16:02:00 -0800 | [diff] [blame] | 152 | struct vm_unmapped_area_info info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 154 | if (len & ~huge_page_mask(h)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | return -EINVAL; |
| 156 | if (len > TASK_SIZE) |
| 157 | return -ENOMEM; |
| 158 | |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 159 | if (flags & MAP_FIXED) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 160 | if (prepare_hugepage_range(file, addr, len)) |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 161 | return -EINVAL; |
| 162 | return addr; |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (addr) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 166 | addr = ALIGN(addr, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | vma = find_vma(mm, addr); |
| 168 | if (TASK_SIZE - len >= addr && |
| 169 | (!vma || addr + len <= vma->vm_start)) |
| 170 | return addr; |
| 171 | } |
| 172 | |
Michel Lespinasse | 0865935 | 2012-12-11 16:02:00 -0800 | [diff] [blame] | 173 | info.flags = 0; |
| 174 | info.length = len; |
| 175 | info.low_limit = TASK_UNMAPPED_BASE; |
| 176 | info.high_limit = TASK_SIZE; |
| 177 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
| 178 | info.align_offset = 0; |
| 179 | return vm_unmapped_area(&info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | #endif |
| 182 | |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 183 | static size_t |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 184 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 185 | struct iov_iter *to, unsigned long size) |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 186 | { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 187 | size_t copied = 0; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 188 | int i, chunksize; |
| 189 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 190 | /* Find which 4k chunk and offset with in that chunk */ |
| 191 | i = offset >> PAGE_CACHE_SHIFT; |
| 192 | offset = offset & ~PAGE_CACHE_MASK; |
| 193 | |
| 194 | while (size) { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 195 | size_t n; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 196 | chunksize = PAGE_CACHE_SIZE; |
| 197 | if (offset) |
| 198 | chunksize -= offset; |
| 199 | if (chunksize > size) |
| 200 | chunksize = size; |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 201 | n = copy_page_to_iter(&page[i], offset, chunksize, to); |
| 202 | copied += n; |
| 203 | if (n != chunksize) |
| 204 | return copied; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 205 | offset = 0; |
| 206 | size -= chunksize; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 207 | i++; |
| 208 | } |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 209 | return copied; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Support for read() - Find the page attached to f_mapping and copy out the |
| 214 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that |
| 215 | * since it has PAGE_CACHE_SIZE assumptions. |
| 216 | */ |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 217 | 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] | 218 | { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 219 | struct file *file = iocb->ki_filp; |
| 220 | struct hstate *h = hstate_file(file); |
| 221 | struct address_space *mapping = file->f_mapping; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 222 | struct inode *inode = mapping->host; |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 223 | unsigned long index = iocb->ki_pos >> huge_page_shift(h); |
| 224 | unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 225 | unsigned long end_index; |
| 226 | loff_t isize; |
| 227 | ssize_t retval = 0; |
| 228 | |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 229 | while (iov_iter_count(to)) { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 230 | struct page *page; |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 231 | size_t nr, copied; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 232 | |
| 233 | /* nr is the maximum number of bytes to copy from this page */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 234 | nr = huge_page_size(h); |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 235 | isize = i_size_read(inode); |
| 236 | if (!isize) |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 237 | break; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 238 | end_index = (isize - 1) >> huge_page_shift(h); |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 239 | if (index > end_index) |
| 240 | break; |
| 241 | if (index == end_index) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 242 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 243 | if (nr <= offset) |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 244 | break; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 245 | } |
| 246 | nr = nr - offset; |
| 247 | |
| 248 | /* Find the page */ |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 249 | page = find_lock_page(mapping, index); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 250 | if (unlikely(page == NULL)) { |
| 251 | /* |
| 252 | * We have a HOLE, zero out the user-buffer for the |
| 253 | * length of the hole or request. |
| 254 | */ |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 255 | copied = iov_iter_zero(nr, to); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 256 | } else { |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 257 | unlock_page(page); |
| 258 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 259 | /* |
| 260 | * We have the page, copy it to user space buffer. |
| 261 | */ |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 262 | copied = hugetlbfs_read_actor(page, offset, to, nr); |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 263 | page_cache_release(page); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 264 | } |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 265 | offset += copied; |
| 266 | retval += copied; |
| 267 | if (copied != nr && iov_iter_count(to)) { |
| 268 | if (!retval) |
| 269 | retval = -EFAULT; |
| 270 | break; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 271 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 272 | index += offset >> huge_page_shift(h); |
| 273 | offset &= ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 274 | } |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 275 | iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 276 | return retval; |
| 277 | } |
| 278 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 279 | static int hugetlbfs_write_begin(struct file *file, |
| 280 | struct address_space *mapping, |
| 281 | loff_t pos, unsigned len, unsigned flags, |
| 282 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | { |
| 284 | return -EINVAL; |
| 285 | } |
| 286 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 287 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
| 288 | loff_t pos, unsigned len, unsigned copied, |
| 289 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 291 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | return -EINVAL; |
| 293 | } |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | static void truncate_huge_page(struct page *page) |
| 296 | { |
Linus Torvalds | fba2591 | 2006-12-20 13:46:42 -0800 | [diff] [blame] | 297 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | ClearPageUptodate(page); |
Minchan Kim | bd65cb8 | 2011-03-22 16:30:54 -0700 | [diff] [blame] | 299 | delete_from_page_cache(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 302 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 304 | struct hstate *h = hstate_inode(inode); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 305 | struct address_space *mapping = &inode->i_data; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 306 | const pgoff_t start = lstart >> huge_page_shift(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | struct pagevec pvec; |
| 308 | pgoff_t next; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 309 | int i, freed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | pagevec_init(&pvec, 0); |
| 312 | next = start; |
| 313 | while (1) { |
| 314 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { |
| 315 | if (next == start) |
| 316 | break; |
| 317 | next = start; |
| 318 | continue; |
| 319 | } |
| 320 | |
| 321 | for (i = 0; i < pagevec_count(&pvec); ++i) { |
| 322 | struct page *page = pvec.pages[i]; |
| 323 | |
| 324 | lock_page(page); |
| 325 | if (page->index > next) |
| 326 | next = page->index; |
| 327 | ++next; |
| 328 | truncate_huge_page(page); |
| 329 | unlock_page(page); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 330 | freed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | huge_pagevec_release(&pvec); |
| 333 | } |
| 334 | BUG_ON(!lstart && mapping->nrpages); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 335 | hugetlb_unreserve_pages(inode, start, freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 338 | static void hugetlbfs_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 340 | struct resv_map *resv_map; |
| 341 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 342 | truncate_hugepages(inode, 0); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 343 | resv_map = (struct resv_map *)inode->i_mapping->private_data; |
| 344 | /* root inode doesn't have the resv_map, so we should check it */ |
| 345 | if (resv_map) |
| 346 | resv_map_release(&resv_map->refs); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 347 | clear_inode(inode); |
Christoph Hellwig | 149f421 | 2005-10-29 18:16:43 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | static inline void |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 351 | hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
| 353 | struct vm_area_struct *vma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 355 | vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | unsigned long v_offset; |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | /* |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 359 | * Can the expression below overflow on 32-bit arches? |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 360 | * No, because the interval tree returns us only those vmas |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 361 | * which overlap the truncated area starting at pgoff, |
| 362 | * and no vma on a 32-bit arch can span beyond the 4GB. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | */ |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 364 | if (vma->vm_pgoff < pgoff) |
| 365 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; |
| 366 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | v_offset = 0; |
| 368 | |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 369 | unmap_hugepage_range(vma, vma->vm_start + v_offset, |
| 370 | vma->vm_end, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | } |
| 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
| 375 | { |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 376 | pgoff_t pgoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | struct address_space *mapping = inode->i_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 378 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 380 | BUG_ON(offset & ~huge_page_mask(h)); |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 381 | pgoff = offset >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
Ken Chen | 7aa91e1 | 2007-10-16 01:26:21 -0700 | [diff] [blame] | 383 | i_size_write(inode, offset); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 384 | i_mmap_lock_write(mapping); |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 385 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 387 | i_mmap_unlock_write(mapping); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 388 | truncate_hugepages(inode, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 393 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame^] | 394 | struct inode *inode = d_inode(dentry); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 395 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | int error; |
| 397 | unsigned int ia_valid = attr->ia_valid; |
| 398 | |
| 399 | BUG_ON(!inode); |
| 400 | |
| 401 | error = inode_change_ok(inode, attr); |
| 402 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 403 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
| 405 | if (ia_valid & ATTR_SIZE) { |
| 406 | error = -EINVAL; |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 407 | if (attr->ia_size & ~huge_page_mask(h)) |
| 408 | return -EINVAL; |
| 409 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 411 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 413 | |
| 414 | setattr_copy(inode, attr); |
| 415 | mark_inode_dirty(inode); |
| 416 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 419 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
| 420 | struct hugetlbfs_config *config) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
| 422 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | inode = new_inode(sb); |
| 425 | if (inode) { |
| 426 | struct hugetlbfs_inode_info *info; |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 427 | inode->i_ino = get_next_ino(); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 428 | inode->i_mode = S_IFDIR | config->mode; |
| 429 | inode->i_uid = config->uid; |
| 430 | inode->i_gid = config->gid; |
| 431 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 432 | info = HUGETLBFS_I(inode); |
| 433 | mpol_shared_policy_init(&info->policy, NULL); |
| 434 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 435 | inode->i_fop = &simple_dir_operations; |
| 436 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
| 437 | inc_nlink(inode); |
Aneesh Kumar K.V | 65ed760 | 2012-04-25 16:01:50 -0700 | [diff] [blame] | 438 | lockdep_annotate_inode_mutex_key(inode); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 439 | } |
| 440 | return inode; |
| 441 | } |
| 442 | |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 443 | /* |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 444 | * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 445 | * be taken from reclaim -- unlike regular filesystems. This needs an |
| 446 | * annotation because huge_pmd_share() does an allocation under |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 447 | * i_mmap_rwsem. |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 448 | */ |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 449 | static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; |
Michal Hocko | b610ded | 2013-08-13 16:00:55 -0700 | [diff] [blame] | 450 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 451 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
| 452 | struct inode *dir, |
Al Viro | 18df225 | 2011-07-24 23:17:40 -0400 | [diff] [blame] | 453 | umode_t mode, dev_t dev) |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 454 | { |
| 455 | struct inode *inode; |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 456 | struct resv_map *resv_map; |
| 457 | |
| 458 | resv_map = resv_map_alloc(); |
| 459 | if (!resv_map) |
| 460 | return NULL; |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 461 | |
| 462 | inode = new_inode(sb); |
| 463 | if (inode) { |
| 464 | struct hugetlbfs_inode_info *info; |
| 465 | inode->i_ino = get_next_ino(); |
| 466 | inode_init_owner(inode, dir, mode); |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 467 | lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, |
| 468 | &hugetlbfs_i_mmap_rwsem_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 471 | inode->i_mapping->private_data = resv_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | info = HUGETLBFS_I(inode); |
Eric B Munson | 6bfde05 | 2009-09-21 17:03:43 -0700 | [diff] [blame] | 473 | /* |
| 474 | * The policy is initialized here even if we are creating a |
| 475 | * private inode because initialization simply creates an |
| 476 | * an empty rb tree and calls spin_lock_init(), later when we |
| 477 | * call mpol_free_shared_policy() it will just return because |
| 478 | * the rb tree will still be empty. |
| 479 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 480 | mpol_shared_policy_init(&info->policy, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | switch (mode & S_IFMT) { |
| 482 | default: |
| 483 | init_special_inode(inode, mode, dev); |
| 484 | break; |
| 485 | case S_IFREG: |
| 486 | inode->i_op = &hugetlbfs_inode_operations; |
| 487 | inode->i_fop = &hugetlbfs_file_operations; |
| 488 | break; |
| 489 | case S_IFDIR: |
| 490 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 491 | inode->i_fop = &simple_dir_operations; |
| 492 | |
| 493 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 494 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | break; |
| 496 | case S_IFLNK: |
| 497 | inode->i_op = &page_symlink_inode_operations; |
| 498 | break; |
| 499 | } |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 500 | lockdep_annotate_inode_mutex_key(inode); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 501 | } else |
| 502 | kref_put(&resv_map->refs, resv_map_release); |
| 503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | return inode; |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * File creation. Allocate an inode, and we're done.. |
| 509 | */ |
| 510 | static int hugetlbfs_mknod(struct inode *dir, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 511 | struct dentry *dentry, umode_t mode, dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
| 513 | struct inode *inode; |
| 514 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 516 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | if (inode) { |
| 518 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 519 | d_instantiate(dentry, inode); |
| 520 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 521 | error = 0; |
| 522 | } |
| 523 | return error; |
| 524 | } |
| 525 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 526 | 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] | 527 | { |
| 528 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); |
| 529 | if (!retval) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 530 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | return retval; |
| 532 | } |
| 533 | |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 534 | 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] | 535 | { |
| 536 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); |
| 537 | } |
| 538 | |
| 539 | static int hugetlbfs_symlink(struct inode *dir, |
| 540 | struct dentry *dentry, const char *symname) |
| 541 | { |
| 542 | struct inode *inode; |
| 543 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 545 | 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] | 546 | if (inode) { |
| 547 | int l = strlen(symname)+1; |
| 548 | error = page_symlink(inode, symname, l); |
| 549 | if (!error) { |
| 550 | d_instantiate(dentry, inode); |
| 551 | dget(dentry); |
| 552 | } else |
| 553 | iput(inode); |
| 554 | } |
| 555 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 556 | |
| 557 | return error; |
| 558 | } |
| 559 | |
| 560 | /* |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 561 | * mark the head page dirty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | */ |
| 563 | static int hugetlbfs_set_page_dirty(struct page *page) |
| 564 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 565 | struct page *head = compound_head(page); |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 566 | |
| 567 | SetPageDirty(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | return 0; |
| 569 | } |
| 570 | |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 571 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 572 | struct page *newpage, struct page *page, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 573 | enum migrate_mode mode) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 574 | { |
| 575 | int rc; |
| 576 | |
| 577 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); |
Rafael Aquini | 78bd520 | 2012-12-11 16:02:31 -0800 | [diff] [blame] | 578 | if (rc != MIGRATEPAGE_SUCCESS) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 579 | return rc; |
| 580 | migrate_page_copy(newpage, page); |
| 581 | |
Rafael Aquini | 78bd520 | 2012-12-11 16:02:31 -0800 | [diff] [blame] | 582 | return MIGRATEPAGE_SUCCESS; |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 583 | } |
| 584 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 585 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 587 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame^] | 588 | struct hstate *h = hstate_inode(d_inode(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
| 590 | buf->f_type = HUGETLBFS_MAGIC; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 591 | buf->f_bsize = huge_page_size(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | if (sbinfo) { |
| 593 | spin_lock(&sbinfo->stat_lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 594 | /* If no limits set, just report 0 for max/free/used |
| 595 | * blocks, like simple_statfs() */ |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 596 | if (sbinfo->spool) { |
| 597 | long free_pages; |
| 598 | |
| 599 | spin_lock(&sbinfo->spool->lock); |
| 600 | buf->f_blocks = sbinfo->spool->max_hpages; |
| 601 | free_pages = sbinfo->spool->max_hpages |
| 602 | - sbinfo->spool->used_hpages; |
| 603 | buf->f_bavail = buf->f_bfree = free_pages; |
| 604 | spin_unlock(&sbinfo->spool->lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 605 | buf->f_files = sbinfo->max_inodes; |
| 606 | buf->f_ffree = sbinfo->free_inodes; |
| 607 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | spin_unlock(&sbinfo->stat_lock); |
| 609 | } |
| 610 | buf->f_namelen = NAME_MAX; |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | static void hugetlbfs_put_super(struct super_block *sb) |
| 615 | { |
| 616 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); |
| 617 | |
| 618 | if (sbi) { |
| 619 | sb->s_fs_info = NULL; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 620 | |
| 621 | if (sbi->spool) |
| 622 | hugepage_put_subpool(sbi->spool); |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | kfree(sbi); |
| 625 | } |
| 626 | } |
| 627 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 628 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 629 | { |
| 630 | if (sbinfo->free_inodes >= 0) { |
| 631 | spin_lock(&sbinfo->stat_lock); |
| 632 | if (unlikely(!sbinfo->free_inodes)) { |
| 633 | spin_unlock(&sbinfo->stat_lock); |
| 634 | return 0; |
| 635 | } |
| 636 | sbinfo->free_inodes--; |
| 637 | spin_unlock(&sbinfo->stat_lock); |
| 638 | } |
| 639 | |
| 640 | return 1; |
| 641 | } |
| 642 | |
| 643 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 644 | { |
| 645 | if (sbinfo->free_inodes >= 0) { |
| 646 | spin_lock(&sbinfo->stat_lock); |
| 647 | sbinfo->free_inodes++; |
| 648 | spin_unlock(&sbinfo->stat_lock); |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 653 | static struct kmem_cache *hugetlbfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) |
| 656 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 657 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | struct hugetlbfs_inode_info *p; |
| 659 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 660 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | return NULL; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 662 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 663 | if (unlikely(!p)) { |
| 664 | hugetlbfs_inc_free_inodes(sbinfo); |
| 665 | return NULL; |
| 666 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return &p->vfs_inode; |
| 668 | } |
| 669 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 670 | static void hugetlbfs_i_callback(struct rcu_head *head) |
| 671 | { |
| 672 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 673 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
| 674 | } |
| 675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | static void hugetlbfs_destroy_inode(struct inode *inode) |
| 677 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 678 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 680 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | } |
| 682 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 683 | static const struct address_space_operations hugetlbfs_aops = { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 684 | .write_begin = hugetlbfs_write_begin, |
| 685 | .write_end = hugetlbfs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | .set_page_dirty = hugetlbfs_set_page_dirty, |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 687 | .migratepage = hugetlbfs_migrate_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | }; |
| 689 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 690 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 691 | static void init_once(void *foo) |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 692 | { |
| 693 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; |
| 694 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 695 | inode_init_once(&ei->vfs_inode); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 696 | } |
| 697 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 698 | const struct file_operations hugetlbfs_file_operations = { |
Al Viro | 34d0640 | 2015-04-03 11:31:35 -0400 | [diff] [blame] | 699 | .read_iter = hugetlbfs_read_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | .mmap = hugetlbfs_file_mmap, |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 701 | .fsync = noop_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | .get_unmapped_area = hugetlb_get_unmapped_area, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 703 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | }; |
| 705 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 706 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | .create = hugetlbfs_create, |
| 708 | .lookup = simple_lookup, |
| 709 | .link = simple_link, |
| 710 | .unlink = simple_unlink, |
| 711 | .symlink = hugetlbfs_symlink, |
| 712 | .mkdir = hugetlbfs_mkdir, |
| 713 | .rmdir = simple_rmdir, |
| 714 | .mknod = hugetlbfs_mknod, |
| 715 | .rename = simple_rename, |
| 716 | .setattr = hugetlbfs_setattr, |
| 717 | }; |
| 718 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 719 | static const struct inode_operations hugetlbfs_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | .setattr = hugetlbfs_setattr, |
| 721 | }; |
| 722 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 723 | static const struct super_operations hugetlbfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | .alloc_inode = hugetlbfs_alloc_inode, |
| 725 | .destroy_inode = hugetlbfs_destroy_inode, |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 726 | .evict_inode = hugetlbfs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | .statfs = hugetlbfs_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | .put_super = hugetlbfs_put_super, |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 729 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | }; |
| 731 | |
| 732 | static int |
| 733 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) |
| 734 | { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 735 | char *p, *rest; |
| 736 | substring_t args[MAX_OPT_ARGS]; |
| 737 | int option; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 738 | unsigned long long size = 0; |
| 739 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
| 741 | if (!options) |
| 742 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 744 | while ((p = strsep(&options, ",")) != NULL) { |
| 745 | int token; |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 746 | if (!*p) |
| 747 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 749 | token = match_token(p, tokens, args); |
| 750 | switch (token) { |
| 751 | case Opt_uid: |
| 752 | if (match_int(&args[0], &option)) |
| 753 | goto bad_val; |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 754 | pconfig->uid = make_kuid(current_user_ns(), option); |
| 755 | if (!uid_valid(pconfig->uid)) |
| 756 | goto bad_val; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 757 | break; |
| 758 | |
| 759 | case Opt_gid: |
| 760 | if (match_int(&args[0], &option)) |
| 761 | goto bad_val; |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 762 | pconfig->gid = make_kgid(current_user_ns(), option); |
| 763 | if (!gid_valid(pconfig->gid)) |
| 764 | goto bad_val; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 765 | break; |
| 766 | |
| 767 | case Opt_mode: |
| 768 | if (match_octal(&args[0], &option)) |
| 769 | goto bad_val; |
Ken Chen | 75897d6 | 2008-02-04 22:28:36 -0800 | [diff] [blame] | 770 | pconfig->mode = option & 01777U; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 771 | break; |
| 772 | |
| 773 | case Opt_size: { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 774 | /* memparse() will accept a K/M/G without a digit */ |
| 775 | if (!isdigit(*args[0].from)) |
| 776 | goto bad_val; |
| 777 | size = memparse(args[0].from, &rest); |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 778 | setsize = SIZE_STD; |
| 779 | if (*rest == '%') |
| 780 | setsize = SIZE_PERCENT; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 781 | break; |
| 782 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 784 | case Opt_nr_inodes: |
| 785 | /* memparse() will accept a K/M/G without a digit */ |
| 786 | if (!isdigit(*args[0].from)) |
| 787 | goto bad_val; |
| 788 | pconfig->nr_inodes = memparse(args[0].from, &rest); |
| 789 | break; |
| 790 | |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 791 | case Opt_pagesize: { |
| 792 | unsigned long ps; |
| 793 | ps = memparse(args[0].from, &rest); |
| 794 | pconfig->hstate = size_to_hstate(ps); |
| 795 | if (!pconfig->hstate) { |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 796 | pr_err("Unsupported page size %lu MB\n", |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 797 | ps >> 20); |
| 798 | return -EINVAL; |
| 799 | } |
| 800 | break; |
| 801 | } |
| 802 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 803 | default: |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 804 | pr_err("Bad mount option: \"%s\"\n", p); |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 805 | return -EINVAL; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 806 | break; |
| 807 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | } |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 809 | |
| 810 | /* Do size after hstate is set up */ |
| 811 | if (setsize > NO_SIZE) { |
| 812 | struct hstate *h = pconfig->hstate; |
| 813 | if (setsize == SIZE_PERCENT) { |
| 814 | size <<= huge_page_shift(h); |
| 815 | size *= h->max_huge_pages; |
| 816 | do_div(size, 100); |
| 817 | } |
| 818 | pconfig->nr_blocks = (size >> huge_page_shift(h)); |
| 819 | } |
| 820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | return 0; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 822 | |
| 823 | bad_val: |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 824 | 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] | 825 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | } |
| 827 | |
| 828 | static int |
| 829 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) |
| 830 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | int ret; |
| 832 | struct hugetlbfs_config config; |
| 833 | struct hugetlbfs_sb_info *sbinfo; |
| 834 | |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 835 | save_mount_options(sb, data); |
| 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | config.nr_blocks = -1; /* No limit on size by default */ |
| 838 | config.nr_inodes = -1; /* No limit on number of inodes by default */ |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 839 | config.uid = current_fsuid(); |
| 840 | config.gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | config.mode = 0755; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 842 | config.hstate = &default_hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | ret = hugetlbfs_parse_options(data, &config); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | if (ret) |
| 845 | return ret; |
| 846 | |
| 847 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
| 848 | if (!sbinfo) |
| 849 | return -ENOMEM; |
| 850 | sb->s_fs_info = sbinfo; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 851 | sbinfo->hstate = config.hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | spin_lock_init(&sbinfo->stat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | sbinfo->max_inodes = config.nr_inodes; |
| 854 | sbinfo->free_inodes = config.nr_inodes; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 855 | sbinfo->spool = NULL; |
| 856 | if (config.nr_blocks != -1) { |
| 857 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); |
| 858 | if (!sbinfo->spool) |
| 859 | goto out_free; |
| 860 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 862 | sb->s_blocksize = huge_page_size(config.hstate); |
| 863 | sb->s_blocksize_bits = huge_page_shift(config.hstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | sb->s_magic = HUGETLBFS_MAGIC; |
| 865 | sb->s_op = &hugetlbfs_ops; |
| 866 | sb->s_time_gran = 1; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 867 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
| 868 | if (!sb->s_root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return 0; |
| 871 | out_free: |
Fabian Frederick | 6e6870d | 2014-06-04 16:10:40 -0700 | [diff] [blame] | 872 | kfree(sbinfo->spool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | kfree(sbinfo); |
| 874 | return -ENOMEM; |
| 875 | } |
| 876 | |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 877 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
| 878 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | { |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 880 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | static struct file_system_type hugetlbfs_fs_type = { |
| 884 | .name = "hugetlbfs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 885 | .mount = hugetlbfs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | .kill_sb = kill_litter_super, |
| 887 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 888 | MODULE_ALIAS_FS("hugetlbfs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 890 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 892 | static int can_do_hugetlb_shm(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | { |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 894 | kgid_t shm_group; |
| 895 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); |
| 896 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | } |
| 898 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 899 | static int get_hstate_idx(int page_size_log) |
| 900 | { |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 901 | struct hstate *h = hstate_sizelog(page_size_log); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 902 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 903 | if (!h) |
| 904 | return -1; |
| 905 | return h - hstates; |
| 906 | } |
| 907 | |
Fabian Frederick | be1d2cf | 2014-06-04 16:10:39 -0700 | [diff] [blame] | 908 | static const struct dentry_operations anon_ops = { |
Al Viro | 118b230 | 2013-08-24 12:08:17 -0400 | [diff] [blame] | 909 | .d_dname = simple_dname |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 910 | }; |
| 911 | |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 912 | /* |
| 913 | * Note that size should be aligned to proper hugepage size in caller side, |
| 914 | * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. |
| 915 | */ |
| 916 | struct file *hugetlb_file_setup(const char *name, size_t size, |
| 917 | vm_flags_t acctflag, struct user_struct **user, |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 918 | int creat_flags, int page_size_log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | { |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 920 | struct file *file = ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | struct inode *inode; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 922 | struct path path; |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 923 | struct super_block *sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | struct qstr quick_string; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 925 | int hstate_idx; |
| 926 | |
| 927 | hstate_idx = get_hstate_idx(page_size_log); |
| 928 | if (hstate_idx < 0) |
| 929 | return ERR_PTR(-ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 931 | *user = NULL; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 932 | if (!hugetlbfs_vfsmount[hstate_idx]) |
Akinobu Mita | 5bc9859 | 2007-05-06 14:50:18 -0700 | [diff] [blame] | 933 | return ERR_PTR(-ENOENT); |
| 934 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 935 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 936 | *user = current_user(); |
| 937 | if (user_shm_lock(size, *user)) { |
David Rientjes | 21a3c27 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 938 | task_lock(current); |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 939 | 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] | 940 | current->comm, current->pid); |
| 941 | task_unlock(current); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 942 | } else { |
| 943 | *user = NULL; |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 944 | return ERR_PTR(-EPERM); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 945 | } |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 946 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 948 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
Eric W. Biederman | 9d66586 | 2007-06-16 10:16:16 -0700 | [diff] [blame] | 949 | quick_string.name = name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | quick_string.len = strlen(quick_string.name); |
| 951 | quick_string.hash = 0; |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 952 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 953 | if (!path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | goto out_shm_unlock; |
| 955 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 956 | d_set_d_op(path.dentry, &anon_ops); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 957 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 958 | file = ERR_PTR(-ENOSPC); |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 959 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | if (!inode) |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 961 | goto out_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 963 | file = ERR_PTR(-ENOMEM); |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 964 | if (hugetlb_reserve_pages(inode, 0, |
| 965 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
| 966 | acctflag)) |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 967 | goto out_inode; |
| 968 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 969 | d_instantiate(path.dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | inode->i_size = size; |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 971 | clear_nlink(inode); |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 972 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 973 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 974 | &hugetlbfs_file_operations); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 975 | if (IS_ERR(file)) |
Al Viro | b4d232e | 2008-02-23 05:59:19 -0500 | [diff] [blame] | 976 | goto out_dentry; /* inode is already attached */ |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | return file; |
| 979 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 980 | out_inode: |
| 981 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | out_dentry: |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 983 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | out_shm_unlock: |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 985 | if (*user) { |
| 986 | user_shm_unlock(size, *user); |
| 987 | *user = NULL; |
| 988 | } |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 989 | return file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | } |
| 991 | |
| 992 | static int __init init_hugetlbfs_fs(void) |
| 993 | { |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 994 | struct hstate *h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | int error; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 996 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 998 | if (!hugepages_supported()) { |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 999 | pr_info("disabling because there are no supported hugepage sizes\n"); |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 1000 | return -ENOTSUPP; |
| 1001 | } |
| 1002 | |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1003 | error = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
| 1005 | sizeof(struct hugetlbfs_inode_info), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1006 | 0, 0, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | if (hugetlbfs_inode_cachep == NULL) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1008 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
| 1010 | error = register_filesystem(&hugetlbfs_fs_type); |
| 1011 | if (error) |
| 1012 | goto out; |
| 1013 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1014 | i = 0; |
| 1015 | for_each_hstate(h) { |
| 1016 | char buf[50]; |
| 1017 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1019 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
| 1020 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, |
| 1021 | buf); |
| 1022 | |
| 1023 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
Andrew Morton | 9b857d2 | 2014-06-04 16:07:21 -0700 | [diff] [blame] | 1024 | pr_err("Cannot mount internal hugetlbfs for " |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1025 | "page size %uK", ps_kb); |
| 1026 | error = PTR_ERR(hugetlbfs_vfsmount[i]); |
| 1027 | hugetlbfs_vfsmount[i] = NULL; |
| 1028 | } |
| 1029 | i++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | } |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1031 | /* Non default hstates are optional */ |
| 1032 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) |
| 1033 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
| 1035 | out: |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1036 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1037 | out2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | return error; |
| 1039 | } |
| 1040 | |
| 1041 | static void __exit exit_hugetlbfs_fs(void) |
| 1042 | { |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1043 | struct hstate *h; |
| 1044 | int i; |
| 1045 | |
| 1046 | |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 1047 | /* |
| 1048 | * Make sure all delayed rcu free inodes are flushed before we |
| 1049 | * destroy cache. |
| 1050 | */ |
| 1051 | rcu_barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1053 | i = 0; |
| 1054 | for_each_hstate(h) |
| 1055 | kern_unmount(hugetlbfs_vfsmount[i++]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | unregister_filesystem(&hugetlbfs_fs_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | } |
| 1058 | |
| 1059 | module_init(init_hugetlbfs_fs) |
| 1060 | module_exit(exit_hugetlbfs_fs) |
| 1061 | |
| 1062 | MODULE_LICENSE("GPL"); |