Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * hugetlbpage-backed filesystem. Based on ramfs. |
| 3 | * |
| 4 | * William Irwin, 2002 |
| 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 { |
| 45 | uid_t uid; |
| 46 | gid_t gid; |
| 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 | { |
Josef Sipek | b39424e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 100 | struct inode *inode = file->f_path.dentry->d_inode; |
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 | */ |
| 113 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; |
| 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; |
| 154 | unsigned long start_addr; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 155 | struct hstate *h = hstate_file(file); |
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 | |
Xiao Guangrong | 4bfc130 | 2012-03-21 16:33:54 -0700 | [diff] [blame] | 176 | if (len > mm->cached_hole_size) |
| 177 | start_addr = mm->free_area_cache; |
| 178 | else { |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 179 | start_addr = TASK_UNMAPPED_BASE; |
Xiao Guangrong | 4bfc130 | 2012-03-21 16:33:54 -0700 | [diff] [blame] | 180 | mm->cached_hole_size = 0; |
| 181 | } |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | full_search: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 184 | addr = ALIGN(start_addr, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
| 187 | /* At this point: (!vma || addr < vma->vm_end). */ |
| 188 | if (TASK_SIZE - len < addr) { |
| 189 | /* |
| 190 | * Start a new search - just in case we missed |
| 191 | * some holes. |
| 192 | */ |
| 193 | if (start_addr != TASK_UNMAPPED_BASE) { |
| 194 | start_addr = TASK_UNMAPPED_BASE; |
Xiao Guangrong | 4bfc130 | 2012-03-21 16:33:54 -0700 | [diff] [blame] | 195 | mm->cached_hole_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | goto full_search; |
| 197 | } |
| 198 | return -ENOMEM; |
| 199 | } |
| 200 | |
Xiao Guangrong | 4bfc130 | 2012-03-21 16:33:54 -0700 | [diff] [blame] | 201 | if (!vma || addr + len <= vma->vm_start) { |
| 202 | mm->free_area_cache = addr + len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | return addr; |
Xiao Guangrong | 4bfc130 | 2012-03-21 16:33:54 -0700 | [diff] [blame] | 204 | } |
| 205 | if (addr + mm->cached_hole_size < vma->vm_start) |
| 206 | mm->cached_hole_size = vma->vm_start - addr; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 207 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
| 209 | } |
| 210 | #endif |
| 211 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 212 | static int |
| 213 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
| 214 | char __user *buf, unsigned long count, |
| 215 | unsigned long size) |
| 216 | { |
| 217 | char *kaddr; |
| 218 | unsigned long left, copied = 0; |
| 219 | int i, chunksize; |
| 220 | |
| 221 | if (size > count) |
| 222 | size = count; |
| 223 | |
| 224 | /* Find which 4k chunk and offset with in that chunk */ |
| 225 | i = offset >> PAGE_CACHE_SHIFT; |
| 226 | offset = offset & ~PAGE_CACHE_MASK; |
| 227 | |
| 228 | while (size) { |
| 229 | chunksize = PAGE_CACHE_SIZE; |
| 230 | if (offset) |
| 231 | chunksize -= offset; |
| 232 | if (chunksize > size) |
| 233 | chunksize = size; |
| 234 | kaddr = kmap(&page[i]); |
| 235 | left = __copy_to_user(buf, kaddr + offset, chunksize); |
| 236 | kunmap(&page[i]); |
| 237 | if (left) { |
| 238 | copied += (chunksize - left); |
| 239 | break; |
| 240 | } |
| 241 | offset = 0; |
| 242 | size -= chunksize; |
| 243 | buf += chunksize; |
| 244 | copied += chunksize; |
| 245 | i++; |
| 246 | } |
| 247 | return copied ? copied : -EFAULT; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * Support for read() - Find the page attached to f_mapping and copy out the |
| 252 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that |
| 253 | * since it has PAGE_CACHE_SIZE assumptions. |
| 254 | */ |
| 255 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, |
| 256 | size_t len, loff_t *ppos) |
| 257 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 258 | struct hstate *h = hstate_file(filp); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 259 | struct address_space *mapping = filp->f_mapping; |
| 260 | struct inode *inode = mapping->host; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 261 | unsigned long index = *ppos >> huge_page_shift(h); |
| 262 | unsigned long offset = *ppos & ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 263 | unsigned long end_index; |
| 264 | loff_t isize; |
| 265 | ssize_t retval = 0; |
| 266 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 267 | /* validate length */ |
| 268 | if (len == 0) |
| 269 | goto out; |
| 270 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 271 | for (;;) { |
| 272 | struct page *page; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 273 | unsigned long nr, ret; |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 274 | int ra; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 275 | |
| 276 | /* nr is the maximum number of bytes to copy from this page */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 277 | nr = huge_page_size(h); |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 278 | isize = i_size_read(inode); |
| 279 | if (!isize) |
| 280 | goto out; |
| 281 | end_index = (isize - 1) >> huge_page_shift(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 282 | if (index >= end_index) { |
| 283 | if (index > end_index) |
| 284 | goto out; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 285 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 286 | if (nr <= offset) |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 287 | goto out; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 288 | } |
| 289 | nr = nr - offset; |
| 290 | |
| 291 | /* Find the page */ |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 292 | page = find_lock_page(mapping, index); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 293 | if (unlikely(page == NULL)) { |
| 294 | /* |
| 295 | * We have a HOLE, zero out the user-buffer for the |
| 296 | * length of the hole or request. |
| 297 | */ |
| 298 | ret = len < nr ? len : nr; |
| 299 | if (clear_user(buf, ret)) |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 300 | ra = -EFAULT; |
| 301 | else |
| 302 | ra = 0; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 303 | } else { |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 304 | unlock_page(page); |
| 305 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 306 | /* |
| 307 | * We have the page, copy it to user space buffer. |
| 308 | */ |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 309 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
| 310 | ret = ra; |
Aneesh Kumar K.V | a05b085 | 2012-03-21 16:34:08 -0700 | [diff] [blame] | 311 | page_cache_release(page); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 312 | } |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 313 | if (ra < 0) { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 314 | if (retval == 0) |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 315 | retval = ra; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 316 | goto out; |
| 317 | } |
| 318 | |
| 319 | offset += ret; |
| 320 | retval += ret; |
| 321 | len -= ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 322 | index += offset >> huge_page_shift(h); |
| 323 | offset &= ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 324 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 325 | /* short read or no more work */ |
| 326 | if ((ret != nr) || (len == 0)) |
| 327 | break; |
| 328 | } |
| 329 | out: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 330 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 331 | return retval; |
| 332 | } |
| 333 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 334 | static int hugetlbfs_write_begin(struct file *file, |
| 335 | struct address_space *mapping, |
| 336 | loff_t pos, unsigned len, unsigned flags, |
| 337 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
| 339 | return -EINVAL; |
| 340 | } |
| 341 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 342 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
| 343 | loff_t pos, unsigned len, unsigned copied, |
| 344 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 346 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | return -EINVAL; |
| 348 | } |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | static void truncate_huge_page(struct page *page) |
| 351 | { |
Linus Torvalds | fba2591 | 2006-12-20 13:46:42 -0800 | [diff] [blame] | 352 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | ClearPageUptodate(page); |
Minchan Kim | bd65cb8 | 2011-03-22 16:30:54 -0700 | [diff] [blame] | 354 | delete_from_page_cache(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 357 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 359 | struct hstate *h = hstate_inode(inode); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 360 | struct address_space *mapping = &inode->i_data; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 361 | const pgoff_t start = lstart >> huge_page_shift(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | struct pagevec pvec; |
| 363 | pgoff_t next; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 364 | int i, freed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | pagevec_init(&pvec, 0); |
| 367 | next = start; |
| 368 | while (1) { |
| 369 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { |
| 370 | if (next == start) |
| 371 | break; |
| 372 | next = start; |
| 373 | continue; |
| 374 | } |
| 375 | |
| 376 | for (i = 0; i < pagevec_count(&pvec); ++i) { |
| 377 | struct page *page = pvec.pages[i]; |
| 378 | |
| 379 | lock_page(page); |
| 380 | if (page->index > next) |
| 381 | next = page->index; |
| 382 | ++next; |
| 383 | truncate_huge_page(page); |
| 384 | unlock_page(page); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 385 | freed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
| 387 | huge_pagevec_release(&pvec); |
| 388 | } |
| 389 | BUG_ON(!lstart && mapping->nrpages); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 390 | hugetlb_unreserve_pages(inode, start, freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 393 | static void hugetlbfs_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 395 | truncate_hugepages(inode, 0); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 396 | clear_inode(inode); |
Christoph Hellwig | 149f421 | 2005-10-29 18:16:43 -0700 | [diff] [blame] | 397 | } |
| 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | static inline void |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 400 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | { |
| 402 | struct vm_area_struct *vma; |
| 403 | struct prio_tree_iter iter; |
| 404 | |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 405 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | unsigned long v_offset; |
| 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | /* |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 409 | * Can the expression below overflow on 32-bit arches? |
| 410 | * No, because the prio_tree returns us only those vmas |
| 411 | * which overlap the truncated area starting at pgoff, |
| 412 | * 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] | 413 | */ |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 414 | if (vma->vm_pgoff < pgoff) |
| 415 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; |
| 416 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | v_offset = 0; |
| 418 | |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 419 | __unmap_hugepage_range(vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 420 | vma->vm_start + v_offset, vma->vm_end, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | } |
| 423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
| 425 | { |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 426 | pgoff_t pgoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | struct address_space *mapping = inode->i_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 428 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 430 | BUG_ON(offset & ~huge_page_mask(h)); |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 431 | pgoff = offset >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Ken Chen | 7aa91e1 | 2007-10-16 01:26:21 -0700 | [diff] [blame] | 433 | i_size_write(inode, offset); |
Peter Zijlstra | 3d48ae4 | 2011-05-24 17:12:06 -0700 | [diff] [blame] | 434 | mutex_lock(&mapping->i_mmap_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (!prio_tree_empty(&mapping->i_mmap)) |
| 436 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
Peter Zijlstra | 3d48ae4 | 2011-05-24 17:12:06 -0700 | [diff] [blame] | 437 | mutex_unlock(&mapping->i_mmap_mutex); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 438 | truncate_hugepages(inode, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 443 | { |
| 444 | struct inode *inode = dentry->d_inode; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 445 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | int error; |
| 447 | unsigned int ia_valid = attr->ia_valid; |
| 448 | |
| 449 | BUG_ON(!inode); |
| 450 | |
| 451 | error = inode_change_ok(inode, attr); |
| 452 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 453 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | if (ia_valid & ATTR_SIZE) { |
| 456 | error = -EINVAL; |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 457 | if (attr->ia_size & ~huge_page_mask(h)) |
| 458 | return -EINVAL; |
| 459 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (error) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 461 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 463 | |
| 464 | setattr_copy(inode, attr); |
| 465 | mark_inode_dirty(inode); |
| 466 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 469 | static struct inode *hugetlbfs_get_root(struct super_block *sb, |
| 470 | struct hugetlbfs_config *config) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | { |
| 472 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | inode = new_inode(sb); |
| 475 | if (inode) { |
| 476 | struct hugetlbfs_inode_info *info; |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 477 | inode->i_ino = get_next_ino(); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 478 | inode->i_mode = S_IFDIR | config->mode; |
| 479 | inode->i_uid = config->uid; |
| 480 | inode->i_gid = config->gid; |
| 481 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 482 | info = HUGETLBFS_I(inode); |
| 483 | mpol_shared_policy_init(&info->policy, NULL); |
| 484 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 485 | inode->i_fop = &simple_dir_operations; |
| 486 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
| 487 | inc_nlink(inode); |
Aneesh Kumar K.V | 65ed760 | 2012-04-25 16:01:50 -0700 | [diff] [blame] | 488 | lockdep_annotate_inode_mutex_key(inode); |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 489 | } |
| 490 | return inode; |
| 491 | } |
| 492 | |
| 493 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, |
| 494 | struct inode *dir, |
Al Viro | 18df225 | 2011-07-24 23:17:40 -0400 | [diff] [blame] | 495 | umode_t mode, dev_t dev) |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 496 | { |
| 497 | struct inode *inode; |
| 498 | |
| 499 | inode = new_inode(sb); |
| 500 | if (inode) { |
| 501 | struct hugetlbfs_inode_info *info; |
| 502 | inode->i_ino = get_next_ino(); |
| 503 | inode_init_owner(inode, dir, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | inode->i_mapping->a_ops = &hugetlbfs_aops; |
| 505 | inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; |
| 506 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 507 | INIT_LIST_HEAD(&inode->i_mapping->private_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | info = HUGETLBFS_I(inode); |
Eric B Munson | 6bfde05 | 2009-09-21 17:03:43 -0700 | [diff] [blame] | 509 | /* |
| 510 | * The policy is initialized here even if we are creating a |
| 511 | * private inode because initialization simply creates an |
| 512 | * an empty rb tree and calls spin_lock_init(), later when we |
| 513 | * call mpol_free_shared_policy() it will just return because |
| 514 | * the rb tree will still be empty. |
| 515 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 516 | mpol_shared_policy_init(&info->policy, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | switch (mode & S_IFMT) { |
| 518 | default: |
| 519 | init_special_inode(inode, mode, dev); |
| 520 | break; |
| 521 | case S_IFREG: |
| 522 | inode->i_op = &hugetlbfs_inode_operations; |
| 523 | inode->i_fop = &hugetlbfs_file_operations; |
| 524 | break; |
| 525 | case S_IFDIR: |
| 526 | inode->i_op = &hugetlbfs_dir_inode_operations; |
| 527 | inode->i_fop = &simple_dir_operations; |
| 528 | |
| 529 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 530 | inc_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | break; |
| 532 | case S_IFLNK: |
| 533 | inode->i_op = &page_symlink_inode_operations; |
| 534 | break; |
| 535 | } |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 536 | lockdep_annotate_inode_mutex_key(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | } |
| 538 | return inode; |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * File creation. Allocate an inode, and we're done.. |
| 543 | */ |
| 544 | static int hugetlbfs_mknod(struct inode *dir, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 545 | struct dentry *dentry, umode_t mode, dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
| 547 | struct inode *inode; |
| 548 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 550 | inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | if (inode) { |
| 552 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 553 | d_instantiate(dentry, inode); |
| 554 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 555 | error = 0; |
| 556 | } |
| 557 | return error; |
| 558 | } |
| 559 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 560 | 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] | 561 | { |
| 562 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); |
| 563 | if (!retval) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 564 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | return retval; |
| 566 | } |
| 567 | |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame^] | 568 | 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] | 569 | { |
| 570 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); |
| 571 | } |
| 572 | |
| 573 | static int hugetlbfs_symlink(struct inode *dir, |
| 574 | struct dentry *dentry, const char *symname) |
| 575 | { |
| 576 | struct inode *inode; |
| 577 | int error = -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 579 | 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] | 580 | if (inode) { |
| 581 | int l = strlen(symname)+1; |
| 582 | error = page_symlink(inode, symname, l); |
| 583 | if (!error) { |
| 584 | d_instantiate(dentry, inode); |
| 585 | dget(dentry); |
| 586 | } else |
| 587 | iput(inode); |
| 588 | } |
| 589 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 590 | |
| 591 | return error; |
| 592 | } |
| 593 | |
| 594 | /* |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 595 | * mark the head page dirty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | */ |
| 597 | static int hugetlbfs_set_page_dirty(struct page *page) |
| 598 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 599 | struct page *head = compound_head(page); |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 600 | |
| 601 | SetPageDirty(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | return 0; |
| 603 | } |
| 604 | |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 605 | static int hugetlbfs_migrate_page(struct address_space *mapping, |
Mel Gorman | b969c4a | 2012-01-12 17:19:34 -0800 | [diff] [blame] | 606 | struct page *newpage, struct page *page, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 607 | enum migrate_mode mode) |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 608 | { |
| 609 | int rc; |
| 610 | |
| 611 | rc = migrate_huge_page_move_mapping(mapping, newpage, page); |
| 612 | if (rc) |
| 613 | return rc; |
| 614 | migrate_page_copy(newpage, page); |
| 615 | |
| 616 | return 0; |
| 617 | } |
| 618 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 619 | static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 621 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 622 | struct hstate *h = hstate_inode(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
| 624 | buf->f_type = HUGETLBFS_MAGIC; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 625 | buf->f_bsize = huge_page_size(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (sbinfo) { |
| 627 | spin_lock(&sbinfo->stat_lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 628 | /* If no limits set, just report 0 for max/free/used |
| 629 | * blocks, like simple_statfs() */ |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 630 | if (sbinfo->spool) { |
| 631 | long free_pages; |
| 632 | |
| 633 | spin_lock(&sbinfo->spool->lock); |
| 634 | buf->f_blocks = sbinfo->spool->max_hpages; |
| 635 | free_pages = sbinfo->spool->max_hpages |
| 636 | - sbinfo->spool->used_hpages; |
| 637 | buf->f_bavail = buf->f_bfree = free_pages; |
| 638 | spin_unlock(&sbinfo->spool->lock); |
David Gibson | 74a8a65 | 2005-11-21 21:32:24 -0800 | [diff] [blame] | 639 | buf->f_files = sbinfo->max_inodes; |
| 640 | buf->f_ffree = sbinfo->free_inodes; |
| 641 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | spin_unlock(&sbinfo->stat_lock); |
| 643 | } |
| 644 | buf->f_namelen = NAME_MAX; |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | static void hugetlbfs_put_super(struct super_block *sb) |
| 649 | { |
| 650 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); |
| 651 | |
| 652 | if (sbi) { |
| 653 | sb->s_fs_info = NULL; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 654 | |
| 655 | if (sbi->spool) |
| 656 | hugepage_put_subpool(sbi->spool); |
| 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | kfree(sbi); |
| 659 | } |
| 660 | } |
| 661 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 662 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 663 | { |
| 664 | if (sbinfo->free_inodes >= 0) { |
| 665 | spin_lock(&sbinfo->stat_lock); |
| 666 | if (unlikely(!sbinfo->free_inodes)) { |
| 667 | spin_unlock(&sbinfo->stat_lock); |
| 668 | return 0; |
| 669 | } |
| 670 | sbinfo->free_inodes--; |
| 671 | spin_unlock(&sbinfo->stat_lock); |
| 672 | } |
| 673 | |
| 674 | return 1; |
| 675 | } |
| 676 | |
| 677 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 678 | { |
| 679 | if (sbinfo->free_inodes >= 0) { |
| 680 | spin_lock(&sbinfo->stat_lock); |
| 681 | sbinfo->free_inodes++; |
| 682 | spin_unlock(&sbinfo->stat_lock); |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 687 | static struct kmem_cache *hugetlbfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
| 689 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) |
| 690 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 691 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | struct hugetlbfs_inode_info *p; |
| 693 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 694 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | return NULL; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 696 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 697 | if (unlikely(!p)) { |
| 698 | hugetlbfs_inc_free_inodes(sbinfo); |
| 699 | return NULL; |
| 700 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | return &p->vfs_inode; |
| 702 | } |
| 703 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 704 | static void hugetlbfs_i_callback(struct rcu_head *head) |
| 705 | { |
| 706 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 707 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
| 708 | } |
| 709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | static void hugetlbfs_destroy_inode(struct inode *inode) |
| 711 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 712 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 714 | call_rcu(&inode->i_rcu, hugetlbfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 717 | static const struct address_space_operations hugetlbfs_aops = { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 718 | .write_begin = hugetlbfs_write_begin, |
| 719 | .write_end = hugetlbfs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | .set_page_dirty = hugetlbfs_set_page_dirty, |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 721 | .migratepage = hugetlbfs_migrate_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | }; |
| 723 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 724 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 725 | static void init_once(void *foo) |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 726 | { |
| 727 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; |
| 728 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 729 | inode_init_once(&ei->vfs_inode); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 730 | } |
| 731 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 732 | const struct file_operations hugetlbfs_file_operations = { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 733 | .read = hugetlbfs_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | .mmap = hugetlbfs_file_mmap, |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 735 | .fsync = noop_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | .get_unmapped_area = hugetlb_get_unmapped_area, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 737 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | }; |
| 739 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 740 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | .create = hugetlbfs_create, |
| 742 | .lookup = simple_lookup, |
| 743 | .link = simple_link, |
| 744 | .unlink = simple_unlink, |
| 745 | .symlink = hugetlbfs_symlink, |
| 746 | .mkdir = hugetlbfs_mkdir, |
| 747 | .rmdir = simple_rmdir, |
| 748 | .mknod = hugetlbfs_mknod, |
| 749 | .rename = simple_rename, |
| 750 | .setattr = hugetlbfs_setattr, |
| 751 | }; |
| 752 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 753 | static const struct inode_operations hugetlbfs_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | .setattr = hugetlbfs_setattr, |
| 755 | }; |
| 756 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 757 | static const struct super_operations hugetlbfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | .alloc_inode = hugetlbfs_alloc_inode, |
| 759 | .destroy_inode = hugetlbfs_destroy_inode, |
Al Viro | 2bbbda3 | 2010-06-04 19:52:12 -0400 | [diff] [blame] | 760 | .evict_inode = hugetlbfs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | .statfs = hugetlbfs_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | .put_super = hugetlbfs_put_super, |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 763 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | }; |
| 765 | |
| 766 | static int |
| 767 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) |
| 768 | { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 769 | char *p, *rest; |
| 770 | substring_t args[MAX_OPT_ARGS]; |
| 771 | int option; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 772 | unsigned long long size = 0; |
| 773 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | if (!options) |
| 776 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 778 | while ((p = strsep(&options, ",")) != NULL) { |
| 779 | int token; |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 780 | if (!*p) |
| 781 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 783 | token = match_token(p, tokens, args); |
| 784 | switch (token) { |
| 785 | case Opt_uid: |
| 786 | if (match_int(&args[0], &option)) |
| 787 | goto bad_val; |
| 788 | pconfig->uid = option; |
| 789 | break; |
| 790 | |
| 791 | case Opt_gid: |
| 792 | if (match_int(&args[0], &option)) |
| 793 | goto bad_val; |
| 794 | pconfig->gid = option; |
| 795 | break; |
| 796 | |
| 797 | case Opt_mode: |
| 798 | if (match_octal(&args[0], &option)) |
| 799 | goto bad_val; |
Ken Chen | 75897d6 | 2008-02-04 22:28:36 -0800 | [diff] [blame] | 800 | pconfig->mode = option & 01777U; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 801 | break; |
| 802 | |
| 803 | case Opt_size: { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 804 | /* memparse() will accept a K/M/G without a digit */ |
| 805 | if (!isdigit(*args[0].from)) |
| 806 | goto bad_val; |
| 807 | size = memparse(args[0].from, &rest); |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 808 | setsize = SIZE_STD; |
| 809 | if (*rest == '%') |
| 810 | setsize = SIZE_PERCENT; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 811 | break; |
| 812 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 814 | case Opt_nr_inodes: |
| 815 | /* memparse() will accept a K/M/G without a digit */ |
| 816 | if (!isdigit(*args[0].from)) |
| 817 | goto bad_val; |
| 818 | pconfig->nr_inodes = memparse(args[0].from, &rest); |
| 819 | break; |
| 820 | |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 821 | case Opt_pagesize: { |
| 822 | unsigned long ps; |
| 823 | ps = memparse(args[0].from, &rest); |
| 824 | pconfig->hstate = size_to_hstate(ps); |
| 825 | if (!pconfig->hstate) { |
| 826 | printk(KERN_ERR |
| 827 | "hugetlbfs: Unsupported page size %lu MB\n", |
| 828 | ps >> 20); |
| 829 | return -EINVAL; |
| 830 | } |
| 831 | break; |
| 832 | } |
| 833 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 834 | default: |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 835 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
| 836 | p); |
| 837 | return -EINVAL; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 838 | break; |
| 839 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 841 | |
| 842 | /* Do size after hstate is set up */ |
| 843 | if (setsize > NO_SIZE) { |
| 844 | struct hstate *h = pconfig->hstate; |
| 845 | if (setsize == SIZE_PERCENT) { |
| 846 | size <<= huge_page_shift(h); |
| 847 | size *= h->max_huge_pages; |
| 848 | do_div(size, 100); |
| 849 | } |
| 850 | pconfig->nr_blocks = (size >> huge_page_shift(h)); |
| 851 | } |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | return 0; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 854 | |
| 855 | bad_val: |
| 856 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", |
| 857 | args[0].from, p); |
Akinobu Mita | c12ddba | 2009-04-21 12:24:05 -0700 | [diff] [blame] | 858 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | static int |
| 862 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) |
| 863 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | int ret; |
| 865 | struct hugetlbfs_config config; |
| 866 | struct hugetlbfs_sb_info *sbinfo; |
| 867 | |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 868 | save_mount_options(sb, data); |
| 869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | config.nr_blocks = -1; /* No limit on size by default */ |
| 871 | config.nr_inodes = -1; /* No limit on number of inodes by default */ |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 872 | config.uid = current_fsuid(); |
| 873 | config.gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | config.mode = 0755; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 875 | config.hstate = &default_hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | ret = hugetlbfs_parse_options(data, &config); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | if (ret) |
| 878 | return ret; |
| 879 | |
| 880 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
| 881 | if (!sbinfo) |
| 882 | return -ENOMEM; |
| 883 | sb->s_fs_info = sbinfo; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 884 | sbinfo->hstate = config.hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | spin_lock_init(&sbinfo->stat_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | sbinfo->max_inodes = config.nr_inodes; |
| 887 | sbinfo->free_inodes = config.nr_inodes; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 888 | sbinfo->spool = NULL; |
| 889 | if (config.nr_blocks != -1) { |
| 890 | sbinfo->spool = hugepage_new_subpool(config.nr_blocks); |
| 891 | if (!sbinfo->spool) |
| 892 | goto out_free; |
| 893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 895 | sb->s_blocksize = huge_page_size(config.hstate); |
| 896 | sb->s_blocksize_bits = huge_page_shift(config.hstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | sb->s_magic = HUGETLBFS_MAGIC; |
| 898 | sb->s_op = &hugetlbfs_ops; |
| 899 | sb->s_time_gran = 1; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 900 | sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); |
| 901 | if (!sb->s_root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | return 0; |
| 904 | out_free: |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 905 | if (sbinfo->spool) |
| 906 | kfree(sbinfo->spool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | kfree(sbinfo); |
| 908 | return -ENOMEM; |
| 909 | } |
| 910 | |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 911 | static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, |
| 912 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | { |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 914 | return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | static struct file_system_type hugetlbfs_fs_type = { |
| 918 | .name = "hugetlbfs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 919 | .mount = hugetlbfs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | .kill_sb = kill_litter_super, |
| 921 | }; |
| 922 | |
| 923 | static struct vfsmount *hugetlbfs_vfsmount; |
| 924 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 925 | static int can_do_hugetlb_shm(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | { |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 927 | return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 930 | struct file *hugetlb_file_setup(const char *name, unsigned long addr, |
| 931 | size_t size, vm_flags_t acctflag, |
Eric B Munson | 6bfde05 | 2009-09-21 17:03:43 -0700 | [diff] [blame] | 932 | struct user_struct **user, int creat_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | { |
| 934 | int error = -ENOMEM; |
| 935 | struct file *file; |
| 936 | struct inode *inode; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 937 | struct path path; |
| 938 | struct dentry *root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | struct qstr quick_string; |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 940 | struct hstate *hstate; |
| 941 | unsigned long num_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 943 | *user = NULL; |
Akinobu Mita | 5bc9859 | 2007-05-06 14:50:18 -0700 | [diff] [blame] | 944 | if (!hugetlbfs_vfsmount) |
| 945 | return ERR_PTR(-ENOENT); |
| 946 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 947 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 948 | *user = current_user(); |
| 949 | if (user_shm_lock(size, *user)) { |
David Rientjes | 21a3c27 | 2012-03-21 16:34:13 -0700 | [diff] [blame] | 950 | task_lock(current); |
| 951 | printk_once(KERN_WARNING |
| 952 | "%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", |
| 953 | current->comm, current->pid); |
| 954 | task_unlock(current); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 955 | } else { |
| 956 | *user = NULL; |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 957 | return ERR_PTR(-EPERM); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 958 | } |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 959 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | root = hugetlbfs_vfsmount->mnt_root; |
Eric W. Biederman | 9d66586 | 2007-06-16 10:16:16 -0700 | [diff] [blame] | 962 | quick_string.name = name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | quick_string.len = strlen(quick_string.name); |
| 964 | quick_string.hash = 0; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 965 | path.dentry = d_alloc(root, &quick_string); |
| 966 | if (!path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | goto out_shm_unlock; |
| 968 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 969 | path.mnt = mntget(hugetlbfs_vfsmount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | error = -ENOSPC; |
Al Viro | 7d54fa6 | 2011-07-24 20:20:48 -0400 | [diff] [blame] | 971 | inode = hugetlbfs_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | if (!inode) |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 973 | goto out_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 975 | hstate = hstate_inode(inode); |
| 976 | size += addr & ~huge_page_mask(hstate); |
| 977 | num_pages = ALIGN(size, huge_page_size(hstate)) >> |
| 978 | huge_page_shift(hstate); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 979 | error = -ENOMEM; |
Steven Truelove | 40716e2 | 2012-03-21 16:34:14 -0700 | [diff] [blame] | 980 | if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag)) |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 981 | goto out_inode; |
| 982 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 983 | d_instantiate(path.dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | inode->i_size = size; |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 985 | clear_nlink(inode); |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 986 | |
| 987 | error = -ENFILE; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 988 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 989 | &hugetlbfs_file_operations); |
| 990 | if (!file) |
Al Viro | b4d232e | 2008-02-23 05:59:19 -0500 | [diff] [blame] | 991 | goto out_dentry; /* inode is already attached */ |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 992 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | return file; |
| 994 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 995 | out_inode: |
| 996 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | out_dentry: |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 998 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | out_shm_unlock: |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 1000 | if (*user) { |
| 1001 | user_shm_unlock(size, *user); |
| 1002 | *user = NULL; |
| 1003 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | return ERR_PTR(error); |
| 1005 | } |
| 1006 | |
| 1007 | static int __init init_hugetlbfs_fs(void) |
| 1008 | { |
| 1009 | int error; |
| 1010 | struct vfsmount *vfsmount; |
| 1011 | |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1012 | error = bdi_init(&hugetlbfs_backing_dev_info); |
| 1013 | if (error) |
| 1014 | return error; |
| 1015 | |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1016 | error = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
| 1018 | sizeof(struct hugetlbfs_inode_info), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1019 | 0, 0, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | if (hugetlbfs_inode_cachep == NULL) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1021 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
| 1023 | error = register_filesystem(&hugetlbfs_fs_type); |
| 1024 | if (error) |
| 1025 | goto out; |
| 1026 | |
| 1027 | vfsmount = kern_mount(&hugetlbfs_fs_type); |
| 1028 | |
| 1029 | if (!IS_ERR(vfsmount)) { |
| 1030 | hugetlbfs_vfsmount = vfsmount; |
| 1031 | return 0; |
| 1032 | } |
| 1033 | |
| 1034 | error = PTR_ERR(vfsmount); |
| 1035 | |
| 1036 | out: |
Hillf Danton | d1d5e05 | 2012-03-21 16:34:15 -0700 | [diff] [blame] | 1037 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1038 | out2: |
| 1039 | bdi_destroy(&hugetlbfs_backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | return error; |
| 1041 | } |
| 1042 | |
| 1043 | static void __exit exit_hugetlbfs_fs(void) |
| 1044 | { |
| 1045 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Tim Chen | 423e0ab | 2011-07-19 09:32:38 -0700 | [diff] [blame] | 1046 | kern_unmount(hugetlbfs_vfsmount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | unregister_filesystem(&hugetlbfs_fs_type); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1048 | bdi_destroy(&hugetlbfs_backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | } |
| 1050 | |
| 1051 | module_init(init_hugetlbfs_fs) |
| 1052 | module_exit(exit_hugetlbfs_fs) |
| 1053 | |
| 1054 | MODULE_LICENSE("GPL"); |