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 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/thread_info.h> |
| 11 | #include <asm/current.h> |
| 12 | #include <linux/sched.h> /* remove ASAP */ |
| 13 | #include <linux/fs.h> |
| 14 | #include <linux/mount.h> |
| 15 | #include <linux/file.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 16 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/writeback.h> |
| 18 | #include <linux/pagemap.h> |
| 19 | #include <linux/highmem.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/string.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 22 | #include <linux/capability.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 23 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/backing-dev.h> |
| 25 | #include <linux/hugetlb.h> |
| 26 | #include <linux/pagevec.h> |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 27 | #include <linux/parser.h> |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 28 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/slab.h> |
| 30 | #include <linux/dnotify.h> |
| 31 | #include <linux/statfs.h> |
| 32 | #include <linux/security.h> |
Nick Black | 1fd7317d | 2009-09-22 16:43:33 -0700 | [diff] [blame] | 33 | #include <linux/magic.h> |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 34 | #include <linux/migrate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <asm/uaccess.h> |
| 37 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 38 | static const struct super_operations hugetlbfs_ops; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 39 | static const struct address_space_operations hugetlbfs_aops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 40 | const struct file_operations hugetlbfs_file_operations; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 41 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
| 42 | static const struct inode_operations hugetlbfs_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 44 | struct hugetlbfs_config { |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 45 | kuid_t uid; |
| 46 | kgid_t gid; |
David Gibson | a1d776e | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 47 | umode_t mode; |
| 48 | long nr_blocks; |
| 49 | long nr_inodes; |
| 50 | struct hstate *hstate; |
| 51 | }; |
| 52 | |
| 53 | struct hugetlbfs_inode_info { |
| 54 | struct shared_policy policy; |
| 55 | struct inode vfs_inode; |
| 56 | }; |
| 57 | |
| 58 | static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) |
| 59 | { |
| 60 | return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); |
| 61 | } |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | static struct backing_dev_info hugetlbfs_backing_dev_info = { |
Jens Axboe | d993831 | 2009-06-12 14:45:52 +0200 | [diff] [blame] | 64 | .name = "hugetlbfs", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | .ra_pages = 0, /* No readahead */ |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 66 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | int sysctl_hugetlb_shm_group; |
| 70 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 71 | enum { |
| 72 | Opt_size, Opt_nr_inodes, |
| 73 | Opt_mode, Opt_uid, Opt_gid, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 74 | Opt_pagesize, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 75 | Opt_err, |
| 76 | }; |
| 77 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 78 | static const match_table_t tokens = { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 79 | {Opt_size, "size=%s"}, |
| 80 | {Opt_nr_inodes, "nr_inodes=%s"}, |
| 81 | {Opt_mode, "mode=%o"}, |
| 82 | {Opt_uid, "uid=%u"}, |
| 83 | {Opt_gid, "gid=%u"}, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 84 | {Opt_pagesize, "pagesize=%s"}, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 85 | {Opt_err, NULL}, |
| 86 | }; |
| 87 | |
Adam Litke | 2e9b367 | 2005-10-29 18:16:47 -0700 | [diff] [blame] | 88 | static void huge_pagevec_release(struct pagevec *pvec) |
| 89 | { |
| 90 | int i; |
| 91 | |
| 92 | for (i = 0; i < pagevec_count(pvec); ++i) |
| 93 | put_page(pvec->pages[i]); |
| 94 | |
| 95 | pagevec_reinit(pvec); |
| 96 | } |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 99 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 100 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | loff_t len, vma_len; |
| 102 | int ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 103 | struct hstate *h = hstate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 105 | /* |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 106 | * vma address alignment (but not the pgoff alignment) has |
| 107 | * already been checked by prepare_hugepage_range. If you add |
| 108 | * any error returns here, do so after setting VM_HUGETLB, so |
| 109 | * is_vm_hugetlb_page tests below unmap_region go the right |
| 110 | * way when do_mmap_pgoff unwinds (may be important on powerpc |
| 111 | * and ia64). |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 112 | */ |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 113 | vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND | VM_DONTDUMP; |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 114 | vma->vm_ops = &hugetlb_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Becky Bruce | 2b37c35 | 2011-07-25 17:11:49 -0700 | [diff] [blame] | 116 | if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 117 | return -EINVAL; |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
| 120 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 121 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | file_accessed(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | ret = -ENOMEM; |
| 125 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 127 | if (hugetlb_reserve_pages(inode, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 128 | vma->vm_pgoff >> huge_page_order(h), |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 129 | len >> huge_page_shift(h), vma, |
| 130 | vma->vm_flags)) |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 131 | goto out; |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 132 | |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 133 | ret = 0; |
| 134 | hugetlb_prefault_arch_hook(vma->vm_mm); |
Zhang, Yanmin | b6174df | 2006-07-10 04:44:49 -0700 | [diff] [blame] | 135 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | inode->i_size = len; |
| 137 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 138 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | return ret; |
| 141 | } |
| 142 | |
| 143 | /* |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 144 | * Called under down_write(mmap_sem). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | */ |
| 146 | |
Adrian Bunk | d2ba27e8 | 2007-05-06 14:49:00 -0700 | [diff] [blame] | 147 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | static unsigned long |
| 149 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 150 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 151 | { |
| 152 | struct mm_struct *mm = current->mm; |
| 153 | struct vm_area_struct *vma; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 154 | struct hstate *h = hstate_file(file); |
Michel Lespinasse | 0865935 | 2012-12-11 16:02:00 -0800 | [diff] [blame] | 155 | struct vm_unmapped_area_info info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 157 | if (len & ~huge_page_mask(h)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | return -EINVAL; |
| 159 | if (len > TASK_SIZE) |
| 160 | return -ENOMEM; |
| 161 | |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 162 | if (flags & MAP_FIXED) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 163 | if (prepare_hugepage_range(file, addr, len)) |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 164 | return -EINVAL; |
| 165 | return addr; |
| 166 | } |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | if (addr) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 169 | addr = ALIGN(addr, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | vma = find_vma(mm, addr); |
| 171 | if (TASK_SIZE - len >= addr && |
| 172 | (!vma || addr + len <= vma->vm_start)) |
| 173 | return addr; |
| 174 | } |
| 175 | |
Michel Lespinasse | 0865935 | 2012-12-11 16:02:00 -0800 | [diff] [blame] | 176 | info.flags = 0; |
| 177 | info.length = len; |
| 178 | info.low_limit = TASK_UNMAPPED_BASE; |
| 179 | info.high_limit = TASK_SIZE; |
| 180 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
| 181 | info.align_offset = 0; |
| 182 | return vm_unmapped_area(&info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | #endif |
| 185 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 186 | static int |
| 187 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
| 188 | char __user *buf, unsigned long count, |
| 189 | unsigned long size) |
| 190 | { |
| 191 | char *kaddr; |
| 192 | unsigned long left, copied = 0; |
| 193 | int i, chunksize; |
| 194 | |
| 195 | if (size > count) |
| 196 | size = count; |
| 197 | |
| 198 | /* Find which 4k chunk and offset with in that chunk */ |
| 199 | i = offset >> PAGE_CACHE_SHIFT; |
| 200 | offset = offset & ~PAGE_CACHE_MASK; |
| 201 | |
| 202 | while (size) { |
| 203 | chunksize = PAGE_CACHE_SIZE; |
| 204 | if (offset) |
| 205 | chunksize -= offset; |
| 206 | if (chunksize > size) |
| 207 | chunksize = size; |
| 208 | kaddr = kmap(&page[i]); |
| 209 | left = __copy_to_user(buf, kaddr + offset, chunksize); |
| 210 | kunmap(&page[i]); |
| 211 | if (left) { |
| 212 | copied += (chunksize - left); |
| 213 | break; |
| 214 | } |
| 215 | offset = 0; |
| 216 | size -= chunksize; |
| 217 | buf += chunksize; |
| 218 | copied += chunksize; |
| 219 | i++; |
| 220 | } |
| 221 | return copied ? copied : -EFAULT; |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Support for read() - Find the page attached to f_mapping and copy out the |
| 226 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that |
| 227 | * since it has PAGE_CACHE_SIZE assumptions. |
| 228 | */ |
| 229 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, |
| 230 | size_t len, loff_t *ppos) |
| 231 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 232 | struct hstate *h = hstate_file(filp); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 233 | struct address_space *mapping = filp->f_mapping; |
| 234 | struct inode *inode = mapping->host; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 235 | unsigned long index = *ppos >> huge_page_shift(h); |
| 236 | unsigned long offset = *ppos & ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 237 | unsigned long end_index; |
| 238 | loff_t isize; |
| 239 | ssize_t retval = 0; |
| 240 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 241 | /* validate length */ |
| 242 | if (len == 0) |
| 243 | goto out; |
| 244 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 245 | for (;;) { |
| 246 | struct page *page; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 247 | unsigned long nr, ret; |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 248 | int ra; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 249 | |
| 250 | /* nr is the maximum number of bytes to copy from this page */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 251 | nr = huge_page_size(h); |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 252 | isize = i_size_read(inode); |
| 253 | if (!isize) |
| 254 | goto out; |
| 255 | end_index = (isize - 1) >> huge_page_shift(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 256 | if (index >= end_index) { |
| 257 | if (index > end_index) |
| 258 | goto out; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 259 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 260 | if (nr <= offset) |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 261 | goto out; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 262 | } |
| 263 | nr = nr - offset; |
| 264 | |
| 265 | /* Find the page */ |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 266 | page = find_lock_page(mapping, index); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 267 | if (unlikely(page == NULL)) { |
| 268 | /* |
| 269 | * We have a HOLE, zero out the user-buffer for the |
| 270 | * length of the hole or request. |
| 271 | */ |
| 272 | ret = len < nr ? len : nr; |
| 273 | if (clear_user(buf, ret)) |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 274 | ra = -EFAULT; |
| 275 | else |
| 276 | ra = 0; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 277 | } else { |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 278 | unlock_page(page); |
| 279 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 280 | /* |
| 281 | * We have the page, copy it to user space buffer. |
| 282 | */ |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 283 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
| 284 | ret = ra; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 285 | page_cache_release(page); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 286 | } |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 287 | if (ra < 0) { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 288 | if (retval == 0) |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 289 | retval = ra; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 290 | goto out; |
| 291 | } |
| 292 | |
| 293 | offset += ret; |
| 294 | retval += ret; |
| 295 | len -= ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 296 | index += offset >> huge_page_shift(h); |
| 297 | offset &= ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 298 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 299 | /* short read or no more work */ |
| 300 | if ((ret != nr) || (len == 0)) |
| 301 | break; |
| 302 | } |
| 303 | out: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 304 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 305 | return retval; |
| 306 | } |
| 307 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 308 | static int hugetlbfs_write_begin(struct file *file, |
| 309 | struct address_space *mapping, |
| 310 | loff_t pos, unsigned len, unsigned flags, |
| 311 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
| 313 | return -EINVAL; |
| 314 | } |
| 315 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 316 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
| 317 | loff_t pos, unsigned len, unsigned copied, |
| 318 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 320 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | return -EINVAL; |
| 322 | } |
| 323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | static void truncate_huge_page(struct page *page) |
| 325 | { |
Linus Torvalds | fba2591 | 2006-12-20 13:46:42 -0800 | [diff] [blame] | 326 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | ClearPageUptodate(page); |
Minchan Kim | bd65cb8 | 2011-03-22 16:30:54 -0700 | [diff] [blame] | 328 | delete_from_page_cache(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 331 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 333 | struct hstate *h = hstate_inode(inode); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 334 | struct address_space *mapping = &inode->i_data; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 335 | const pgoff_t start = lstart >> huge_page_shift(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | struct pagevec pvec; |
| 337 | pgoff_t next; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 338 | int i, freed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | pagevec_init(&pvec, 0); |
| 341 | next = start; |
| 342 | while (1) { |
| 343 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { |
| 344 | if (next == start) |
| 345 | break; |
| 346 | next = start; |
| 347 | continue; |
| 348 | } |
| 349 | |
| 350 | for (i = 0; i < pagevec_count(&pvec); ++i) { |
| 351 | struct page *page = pvec.pages[i]; |
| 352 | |
| 353 | lock_page(page); |
| 354 | if (page->index > next) |
| 355 | next = page->index; |
| 356 | ++next; |
| 357 | truncate_huge_page(page); |
| 358 | unlock_page(page); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 359 | freed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } |
| 361 | huge_pagevec_release(&pvec); |
| 362 | } |
| 363 | BUG_ON(!lstart && mapping->nrpages); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 364 | hugetlb_unreserve_pages(inode, start, freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
| 366 | |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 367 | static void hugetlbfs_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | { |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 369 | truncate_hugepages(inode, 0); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 370 | clear_inode(inode); |
Christoph Hellwig | 149f421 | 2005-10-29 18:16:43 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | static inline void |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 374 | hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
| 376 | struct vm_area_struct *vma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 378 | vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | unsigned long v_offset; |
| 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /* |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 382 | * Can the expression below overflow on 32-bit arches? |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 383 | * No, because the interval tree returns us only those vmas |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 384 | * which overlap the truncated area starting at pgoff, |
| 385 | * 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] | 386 | */ |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 387 | if (vma->vm_pgoff < pgoff) |
| 388 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; |
| 389 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | v_offset = 0; |
| 391 | |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 392 | unmap_hugepage_range(vma, vma->vm_start + v_offset, |
| 393 | vma->vm_end, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | } |
| 396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
| 398 | { |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 399 | pgoff_t pgoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | struct address_space *mapping = inode->i_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 401 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 403 | BUG_ON(offset & ~huge_page_mask(h)); |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 404 | pgoff = offset >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Ken Chen | 7aa91e1 | 2007-10-16 01:26:21 -0700 | [diff] [blame] | 406 | i_size_write(inode, offset); |
Peter Zijlstra | 3d48ae4 | 2011-05-24 17:12:06 -0700 | [diff] [blame] | 407 | mutex_lock(&mapping->i_mmap_mutex); |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 408 | if (!RB_EMPTY_ROOT(&mapping->i_mmap)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
Peter Zijlstra | 3d48ae4 | 2011-05-24 17:12:06 -0700 | [diff] [blame] | 410 | mutex_unlock(&mapping->i_mmap_mutex); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 411 | truncate_hugepages(inode, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 416 | { |
| 417 | struct inode *inode = dentry->d_inode; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 418 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | int error; |
| 420 | unsigned int ia_valid = attr->ia_valid; |
| 421 | |
| 422 | BUG_ON(!inode); |
| 423 | |
| 424 | error = inode_change_ok(inode, attr); |
| 425 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 426 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | if (ia_valid & ATTR_SIZE) { |
| 429 | error = -EINVAL; |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 430 | if (attr->ia_size & ~huge_page_mask(h)) |
| 431 | return -EINVAL; |
| 432 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 434 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 436 | |
| 437 | setattr_copy(inode, attr); |
| 438 | mark_inode_dirty(inode); |
| 439 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 442 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
| 443 | struct hugetlbfs_config *config) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
| 445 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | inode = new_inode(sb); |
| 448 | if (inode) { |
| 449 | struct hugetlbfs_inode_info *info; |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 450 | inode->i_ino = get_next_ino(); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 451 | inode->i_mode = S_IFDIR | config->mode; |
| 452 | inode->i_uid = config->uid; |
| 453 | inode->i_gid = config->gid; |
| 454 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 455 | info = HUGETLBFS_I(inode); |
| 456 | mpol_shared_policy_init(&info->policy, NULL); |
| 457 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 458 | inode->i_fop = &simple_dir_operations; |
| 459 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
| 460 | inc_nlink(inode); |
Aneesh Kumar K.V | 65ed760 | 2012-04-25 16:01:50 -0700 | [diff] [blame] | 461 | lockdep_annotate_inode_mutex_key(inode); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 462 | } |
| 463 | return inode; |
| 464 | } |
| 465 | |
| 466 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
| 467 | struct inode *dir, |
Al Viro | 18df225 | 2011-07-24 23:17:40 -0400 | [diff] [blame] | 468 | umode_t mode, dev_t dev) |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 469 | { |
| 470 | struct inode *inode; |
| 471 | |
| 472 | inode = new_inode(sb); |
| 473 | if (inode) { |
| 474 | struct hugetlbfs_inode_info *info; |
| 475 | inode->i_ino = get_next_ino(); |
| 476 | inode_init_owner(inode, dir, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
| 478 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; |
| 479 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 480 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | info = HUGETLBFS_I(inode); |
Eric B Munson | 6bfde05 | 2009-09-21 17:03:43 -0700 | [diff] [blame] | 482 | /* |
| 483 | * The policy is initialized here even if we are creating a |
| 484 | * private inode because initialization simply creates an |
| 485 | * an empty rb tree and calls spin_lock_init(), later when we |
| 486 | * call mpol_free_shared_policy() it will just return because |
| 487 | * the rb tree will still be empty. |
| 488 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 489 | mpol_shared_policy_init(&info->policy, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | switch (mode & S_IFMT) { |
| 491 | default: |
| 492 | init_special_inode(inode, mode, dev); |
| 493 | break; |
| 494 | case S_IFREG: |
| 495 | inode->i_op = &hugetlbfs_inode_operations; |
| 496 | inode->i_fop = &hugetlbfs_file_operations; |
| 497 | break; |
| 498 | case S_IFDIR: |
| 499 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 500 | inode->i_fop = &simple_dir_operations; |
| 501 | |
| 502 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 503 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | break; |
| 505 | case S_IFLNK: |
| 506 | inode->i_op = &page_symlink_inode_operations; |
| 507 | break; |
| 508 | } |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 509 | lockdep_annotate_inode_mutex_key(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | return inode; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * File creation. Allocate an inode, and we're done.. |
| 516 | */ |
| 517 | static int hugetlbfs_mknod(struct inode *dir, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 518 | struct dentry *dentry, umode_t mode, dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | { |
| 520 | struct inode *inode; |
| 521 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 523 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | if (inode) { |
| 525 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 526 | d_instantiate(dentry, inode); |
| 527 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 528 | error = 0; |
| 529 | } |
| 530 | return error; |
| 531 | } |
| 532 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 533 | 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] | 534 | { |
| 535 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); |
| 536 | if (!retval) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 537 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | return retval; |
| 539 | } |
| 540 | |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 541 | 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] | 542 | { |
| 543 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); |
| 544 | } |
| 545 | |
| 546 | static int hugetlbfs_symlink(struct inode *dir, |
| 547 | struct dentry *dentry, const char *symname) |
| 548 | { |
| 549 | struct inode *inode; |
| 550 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 552 | 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] | 553 | if (inode) { |
| 554 | int l = strlen(symname)+1; |
| 555 | error = page_symlink(inode, symname, l); |
| 556 | if (!error) { |
| 557 | d_instantiate(dentry, inode); |
| 558 | dget(dentry); |
| 559 | } else |
| 560 | iput(inode); |
| 561 | } |
| 562 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 563 | |
| 564 | return error; |
| 565 | } |
| 566 | |
| 567 | /* |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 568 | * mark the head page dirty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | */ |
| 570 | static int hugetlbfs_set_page_dirty(struct page *page) |
| 571 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 572 | struct page *head = compound_head(page); |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 573 | |
| 574 | SetPageDirty(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | return 0; |
| 576 | } |
| 577 | |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 578 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 579 | struct page *newpage, struct page *page, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 580 | enum migrate_mode mode) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 581 | { |
| 582 | int rc; |
| 583 | |
| 584 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); |
Rafael Aquini | 78bd520 | 2012-12-11 16:02:31 -0800 | [diff] [blame] | 585 | if (rc != MIGRATEPAGE_SUCCESS) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 586 | return rc; |
| 587 | migrate_page_copy(newpage, page); |
| 588 | |
Rafael Aquini | 78bd520 | 2012-12-11 16:02:31 -0800 | [diff] [blame] | 589 | return MIGRATEPAGE_SUCCESS; |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 590 | } |
| 591 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 592 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 594 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 595 | struct hstate *h = hstate_inode(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
| 597 | buf->f_type = HUGETLBFS_MAGIC; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 598 | buf->f_bsize = huge_page_size(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (sbinfo) { |
| 600 | spin_lock(&sbinfo->stat_lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 601 | /* If no limits set, just report 0 for max/free/used |
| 602 | * blocks, like simple_statfs() */ |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 603 | if (sbinfo->spool) { |
| 604 | long free_pages; |
| 605 | |
| 606 | spin_lock(&sbinfo->spool->lock); |
| 607 | buf->f_blocks = sbinfo->spool->max_hpages; |
| 608 | free_pages = sbinfo->spool->max_hpages |
| 609 | - sbinfo->spool->used_hpages; |
| 610 | buf->f_bavail = buf->f_bfree = free_pages; |
| 611 | spin_unlock(&sbinfo->spool->lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 612 | buf->f_files = sbinfo->max_inodes; |
| 613 | buf->f_ffree = sbinfo->free_inodes; |
| 614 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | spin_unlock(&sbinfo->stat_lock); |
| 616 | } |
| 617 | buf->f_namelen = NAME_MAX; |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | static void hugetlbfs_put_super(struct super_block *sb) |
| 622 | { |
| 623 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); |
| 624 | |
| 625 | if (sbi) { |
| 626 | sb->s_fs_info = NULL; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 627 | |
| 628 | if (sbi->spool) |
| 629 | hugepage_put_subpool(sbi->spool); |
| 630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | kfree(sbi); |
| 632 | } |
| 633 | } |
| 634 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 635 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 636 | { |
| 637 | if (sbinfo->free_inodes >= 0) { |
| 638 | spin_lock(&sbinfo->stat_lock); |
| 639 | if (unlikely(!sbinfo->free_inodes)) { |
| 640 | spin_unlock(&sbinfo->stat_lock); |
| 641 | return 0; |
| 642 | } |
| 643 | sbinfo->free_inodes--; |
| 644 | spin_unlock(&sbinfo->stat_lock); |
| 645 | } |
| 646 | |
| 647 | return 1; |
| 648 | } |
| 649 | |
| 650 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 651 | { |
| 652 | if (sbinfo->free_inodes >= 0) { |
| 653 | spin_lock(&sbinfo->stat_lock); |
| 654 | sbinfo->free_inodes++; |
| 655 | spin_unlock(&sbinfo->stat_lock); |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 660 | static struct kmem_cache *hugetlbfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
| 662 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) |
| 663 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 664 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | struct hugetlbfs_inode_info *p; |
| 666 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 667 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | return NULL; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 669 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 670 | if (unlikely(!p)) { |
| 671 | hugetlbfs_inc_free_inodes(sbinfo); |
| 672 | return NULL; |
| 673 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | return &p->vfs_inode; |
| 675 | } |
| 676 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 677 | static void hugetlbfs_i_callback(struct rcu_head *head) |
| 678 | { |
| 679 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 680 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
| 681 | } |
| 682 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | static void hugetlbfs_destroy_inode(struct inode *inode) |
| 684 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 685 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 687 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | } |
| 689 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 690 | static const struct address_space_operations hugetlbfs_aops = { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 691 | .write_begin = hugetlbfs_write_begin, |
| 692 | .write_end = hugetlbfs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | .set_page_dirty = hugetlbfs_set_page_dirty, |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 694 | .migratepage = hugetlbfs_migrate_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | }; |
| 696 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 697 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 698 | static void init_once(void *foo) |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 699 | { |
| 700 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; |
| 701 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 702 | inode_init_once(&ei->vfs_inode); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 703 | } |
| 704 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 705 | const struct file_operations hugetlbfs_file_operations = { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 706 | .read = hugetlbfs_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | .mmap = hugetlbfs_file_mmap, |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 708 | .fsync = noop_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | .get_unmapped_area = hugetlb_get_unmapped_area, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 710 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | }; |
| 712 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 713 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | .create = hugetlbfs_create, |
| 715 | .lookup = simple_lookup, |
| 716 | .link = simple_link, |
| 717 | .unlink = simple_unlink, |
| 718 | .symlink = hugetlbfs_symlink, |
| 719 | .mkdir = hugetlbfs_mkdir, |
| 720 | .rmdir = simple_rmdir, |
| 721 | .mknod = hugetlbfs_mknod, |
| 722 | .rename = simple_rename, |
| 723 | .setattr = hugetlbfs_setattr, |
| 724 | }; |
| 725 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 726 | static const struct inode_operations hugetlbfs_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | .setattr = hugetlbfs_setattr, |
| 728 | }; |
| 729 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 730 | static const struct super_operations hugetlbfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | .alloc_inode = hugetlbfs_alloc_inode, |
| 732 | .destroy_inode = hugetlbfs_destroy_inode, |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 733 | .evict_inode = hugetlbfs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | .statfs = hugetlbfs_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | .put_super = hugetlbfs_put_super, |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 736 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | }; |
| 738 | |
| 739 | static int |
| 740 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) |
| 741 | { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 742 | char *p, *rest; |
| 743 | substring_t args[MAX_OPT_ARGS]; |
| 744 | int option; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 745 | unsigned long long size = 0; |
| 746 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
| 748 | if (!options) |
| 749 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 751 | while ((p = strsep(&options, ",")) != NULL) { |
| 752 | int token; |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 753 | if (!*p) |
| 754 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 756 | token = match_token(p, tokens, args); |
| 757 | switch (token) { |
| 758 | case Opt_uid: |
| 759 | if (match_int(&args[0], &option)) |
| 760 | goto bad_val; |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 761 | pconfig->uid = make_kuid(current_user_ns(), option); |
| 762 | if (!uid_valid(pconfig->uid)) |
| 763 | goto bad_val; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 764 | break; |
| 765 | |
| 766 | case Opt_gid: |
| 767 | if (match_int(&args[0], &option)) |
| 768 | goto bad_val; |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 769 | pconfig->gid = make_kgid(current_user_ns(), option); |
| 770 | if (!gid_valid(pconfig->gid)) |
| 771 | goto bad_val; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 772 | break; |
| 773 | |
| 774 | case Opt_mode: |
| 775 | if (match_octal(&args[0], &option)) |
| 776 | goto bad_val; |
Ken Chen | 75897d6 | 2008-02-04 22:28:36 -0800 | [diff] [blame] | 777 | pconfig->mode = option & 01777U; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 778 | break; |
| 779 | |
| 780 | case Opt_size: { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 781 | /* memparse() will accept a K/M/G without a digit */ |
| 782 | if (!isdigit(*args[0].from)) |
| 783 | goto bad_val; |
| 784 | size = memparse(args[0].from, &rest); |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 785 | setsize = SIZE_STD; |
| 786 | if (*rest == '%') |
| 787 | setsize = SIZE_PERCENT; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 788 | break; |
| 789 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 791 | case Opt_nr_inodes: |
| 792 | /* memparse() will accept a K/M/G without a digit */ |
| 793 | if (!isdigit(*args[0].from)) |
| 794 | goto bad_val; |
| 795 | pconfig->nr_inodes = memparse(args[0].from, &rest); |
| 796 | break; |
| 797 | |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 798 | case Opt_pagesize: { |
| 799 | unsigned long ps; |
| 800 | ps = memparse(args[0].from, &rest); |
| 801 | pconfig->hstate = size_to_hstate(ps); |
| 802 | if (!pconfig->hstate) { |
| 803 | printk(KERN_ERR |
| 804 | "hugetlbfs: Unsupported page size %lu MB\n", |
| 805 | ps >> 20); |
| 806 | return -EINVAL; |
| 807 | } |
| 808 | break; |
| 809 | } |
| 810 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 811 | default: |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 812 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
| 813 | p); |
| 814 | return -EINVAL; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 815 | break; |
| 816 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 818 | |
| 819 | /* Do size after hstate is set up */ |
| 820 | if (setsize > NO_SIZE) { |
| 821 | struct hstate *h = pconfig->hstate; |
| 822 | if (setsize == SIZE_PERCENT) { |
| 823 | size <<= huge_page_shift(h); |
| 824 | size *= h->max_huge_pages; |
| 825 | do_div(size, 100); |
| 826 | } |
| 827 | pconfig->nr_blocks = (size >> huge_page_shift(h)); |
| 828 | } |
| 829 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | return 0; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 831 | |
| 832 | bad_val: |
| 833 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", |
| 834 | args[0].from, p); |
Akinobu Mita | c12ddba | 2009-04-21 12:24:05 -0700 | [diff] [blame] | 835 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | static int |
| 839 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) |
| 840 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | int ret; |
| 842 | struct hugetlbfs_config config; |
| 843 | struct hugetlbfs_sb_info *sbinfo; |
| 844 | |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 845 | save_mount_options(sb, data); |
| 846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | config.nr_blocks = -1; /* No limit on size by default */ |
| 848 | config.nr_inodes = -1; /* No limit on number of inodes by default */ |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 849 | config.uid = current_fsuid(); |
| 850 | config.gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | config.mode = 0755; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 852 | config.hstate = &default_hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | ret = hugetlbfs_parse_options(data, &config); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | if (ret) |
| 855 | return ret; |
| 856 | |
| 857 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
| 858 | if (!sbinfo) |
| 859 | return -ENOMEM; |
| 860 | sb->s_fs_info = sbinfo; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 861 | sbinfo->hstate = config.hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | spin_lock_init(&sbinfo->stat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | sbinfo->max_inodes = config.nr_inodes; |
| 864 | sbinfo->free_inodes = config.nr_inodes; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 865 | sbinfo->spool = NULL; |
| 866 | if (config.nr_blocks != -1) { |
| 867 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); |
| 868 | if (!sbinfo->spool) |
| 869 | goto out_free; |
| 870 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 872 | sb->s_blocksize = huge_page_size(config.hstate); |
| 873 | sb->s_blocksize_bits = huge_page_shift(config.hstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | sb->s_magic = HUGETLBFS_MAGIC; |
| 875 | sb->s_op = &hugetlbfs_ops; |
| 876 | sb->s_time_gran = 1; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 877 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
| 878 | if (!sb->s_root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | return 0; |
| 881 | out_free: |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 882 | if (sbinfo->spool) |
| 883 | kfree(sbinfo->spool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | kfree(sbinfo); |
| 885 | return -ENOMEM; |
| 886 | } |
| 887 | |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 888 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
| 889 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | { |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 891 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | static struct file_system_type hugetlbfs_fs_type = { |
| 895 | .name = "hugetlbfs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 896 | .mount = hugetlbfs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | .kill_sb = kill_litter_super, |
| 898 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 899 | MODULE_ALIAS_FS("hugetlbfs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 901 | static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 903 | static int can_do_hugetlb_shm(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | { |
Eric W. Biederman | a0eb3a0 | 2012-02-07 16:19:25 -0800 | [diff] [blame] | 905 | kgid_t shm_group; |
| 906 | shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); |
| 907 | return capable(CAP_IPC_LOCK) || in_group_p(shm_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | } |
| 909 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 910 | static int get_hstate_idx(int page_size_log) |
| 911 | { |
| 912 | struct hstate *h; |
| 913 | |
| 914 | if (!page_size_log) |
| 915 | return default_hstate_idx; |
| 916 | h = size_to_hstate(1 << page_size_log); |
| 917 | if (!h) |
| 918 | return -1; |
| 919 | return h - hstates; |
| 920 | } |
| 921 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 922 | static char *hugetlb_dname(struct dentry *dentry, char *buffer, int buflen) |
| 923 | { |
| 924 | return dynamic_dname(dentry, buffer, buflen, "/%s (deleted)", |
| 925 | dentry->d_name.name); |
| 926 | } |
| 927 | |
| 928 | static struct dentry_operations anon_ops = { |
| 929 | .d_dname = hugetlb_dname |
| 930 | }; |
| 931 | |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 932 | struct file *hugetlb_file_setup(const char *name, unsigned long addr, |
| 933 | size_t size, vm_flags_t acctflag, |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 934 | struct user_struct **user, |
| 935 | int creat_flags, int page_size_log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | { |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 937 | struct file *file = ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | struct inode *inode; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 939 | struct path path; |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 940 | struct super_block *sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | struct qstr quick_string; |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 942 | struct hstate *hstate; |
| 943 | unsigned long num_pages; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 944 | int hstate_idx; |
| 945 | |
| 946 | hstate_idx = get_hstate_idx(page_size_log); |
| 947 | if (hstate_idx < 0) |
| 948 | return ERR_PTR(-ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 950 | *user = NULL; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 951 | if (!hugetlbfs_vfsmount[hstate_idx]) |
Akinobu Mita | 5bc9859 | 2007-05-06 14:50:18 -0700 | [diff] [blame] | 952 | return ERR_PTR(-ENOENT); |
| 953 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 954 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 955 | *user = current_user(); |
| 956 | if (user_shm_lock(size, *user)) { |
David Rientjes | 21a3c27 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 957 | task_lock(current); |
| 958 | printk_once(KERN_WARNING |
| 959 | "%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", |
| 960 | current->comm, current->pid); |
| 961 | task_unlock(current); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 962 | } else { |
| 963 | *user = NULL; |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 964 | return ERR_PTR(-EPERM); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 965 | } |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 966 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 968 | sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; |
Eric W. Biederman | 9d66586 | 2007-06-16 10:16:16 -0700 | [diff] [blame] | 969 | quick_string.name = name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | quick_string.len = strlen(quick_string.name); |
| 971 | quick_string.hash = 0; |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 972 | path.dentry = d_alloc_pseudo(sb, &quick_string); |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 973 | if (!path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | goto out_shm_unlock; |
| 975 | |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 976 | d_set_d_op(path.dentry, &anon_ops); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 977 | path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 978 | file = ERR_PTR(-ENOSPC); |
Al Viro | 0df4d6e | 2013-02-14 22:39:53 -0500 | [diff] [blame] | 979 | inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | if (!inode) |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 981 | goto out_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 983 | hstate = hstate_inode(inode); |
| 984 | size += addr & ~huge_page_mask(hstate); |
| 985 | num_pages = ALIGN(size, huge_page_size(hstate)) >> |
| 986 | huge_page_shift(hstate); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 987 | file = ERR_PTR(-ENOMEM); |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 988 | if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag)) |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 989 | goto out_inode; |
| 990 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 991 | d_instantiate(path.dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | inode->i_size = size; |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 993 | clear_nlink(inode); |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 994 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 995 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 996 | &hugetlbfs_file_operations); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 997 | if (IS_ERR(file)) |
Al Viro | b4d232e | 2008-02-23 05:59:19 -0500 | [diff] [blame] | 998 | goto out_dentry; /* inode is already attached */ |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | return file; |
| 1001 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 1002 | out_inode: |
| 1003 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | out_dentry: |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1005 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | out_shm_unlock: |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1007 | if (*user) { |
| 1008 | user_shm_unlock(size, *user); |
| 1009 | *user = NULL; |
| 1010 | } |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1011 | return file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | } |
| 1013 | |
| 1014 | static int __init init_hugetlbfs_fs(void) |
| 1015 | { |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1016 | struct hstate *h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | int error; |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1018 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1020 | error = bdi_init(&hugetlbfs_backing_dev_info); |
| 1021 | if (error) |
| 1022 | return error; |
| 1023 | |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1024 | error = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
| 1026 | sizeof(struct hugetlbfs_inode_info), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1027 | 0, 0, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | if (hugetlbfs_inode_cachep == NULL) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1029 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
| 1031 | error = register_filesystem(&hugetlbfs_fs_type); |
| 1032 | if (error) |
| 1033 | goto out; |
| 1034 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1035 | i = 0; |
| 1036 | for_each_hstate(h) { |
| 1037 | char buf[50]; |
| 1038 | unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1040 | snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); |
| 1041 | hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, |
| 1042 | buf); |
| 1043 | |
| 1044 | if (IS_ERR(hugetlbfs_vfsmount[i])) { |
| 1045 | pr_err("hugetlb: Cannot mount internal hugetlbfs for " |
| 1046 | "page size %uK", ps_kb); |
| 1047 | error = PTR_ERR(hugetlbfs_vfsmount[i]); |
| 1048 | hugetlbfs_vfsmount[i] = NULL; |
| 1049 | } |
| 1050 | i++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | } |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1052 | /* Non default hstates are optional */ |
| 1053 | if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) |
| 1054 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
| 1056 | out: |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1057 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1058 | out2: |
| 1059 | bdi_destroy(&hugetlbfs_backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | return error; |
| 1061 | } |
| 1062 | |
| 1063 | static void __exit exit_hugetlbfs_fs(void) |
| 1064 | { |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1065 | struct hstate *h; |
| 1066 | int i; |
| 1067 | |
| 1068 | |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 1069 | /* |
| 1070 | * Make sure all delayed rcu free inodes are flushed before we |
| 1071 | * destroy cache. |
| 1072 | */ |
| 1073 | rcu_barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 1075 | i = 0; |
| 1076 | for_each_hstate(h) |
| 1077 | kern_unmount(hugetlbfs_vfsmount[i++]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | unregister_filesystem(&hugetlbfs_fs_type); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1079 | bdi_destroy(&hugetlbfs_backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | module_init(init_hugetlbfs_fs) |
| 1083 | module_exit(exit_hugetlbfs_fs) |
| 1084 | |
| 1085 | MODULE_LICENSE("GPL"); |