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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #include <asm/uaccess.h> |
| 36 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 37 | static const struct super_operations hugetlbfs_ops; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 38 | static const struct address_space_operations hugetlbfs_aops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 39 | const struct file_operations hugetlbfs_file_operations; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 40 | static const struct inode_operations hugetlbfs_dir_inode_operations; |
| 41 | static const struct inode_operations hugetlbfs_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | static struct backing_dev_info hugetlbfs_backing_dev_info = { |
Jens Axboe | d993831 | 2009-06-12 14:45:52 +0200 | [diff] [blame] | 44 | .name = "hugetlbfs", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | .ra_pages = 0, /* No readahead */ |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 46 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
| 49 | int sysctl_hugetlb_shm_group; |
| 50 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 51 | enum { |
| 52 | Opt_size, Opt_nr_inodes, |
| 53 | Opt_mode, Opt_uid, Opt_gid, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 54 | Opt_pagesize, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 55 | Opt_err, |
| 56 | }; |
| 57 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 58 | static const match_table_t tokens = { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 59 | {Opt_size, "size=%s"}, |
| 60 | {Opt_nr_inodes, "nr_inodes=%s"}, |
| 61 | {Opt_mode, "mode=%o"}, |
| 62 | {Opt_uid, "uid=%u"}, |
| 63 | {Opt_gid, "gid=%u"}, |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 64 | {Opt_pagesize, "pagesize=%s"}, |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 65 | {Opt_err, NULL}, |
| 66 | }; |
| 67 | |
Adam Litke | 2e9b367 | 2005-10-29 18:16:47 -0700 | [diff] [blame] | 68 | static void huge_pagevec_release(struct pagevec *pvec) |
| 69 | { |
| 70 | int i; |
| 71 | |
| 72 | for (i = 0; i < pagevec_count(pvec); ++i) |
| 73 | put_page(pvec->pages[i]); |
| 74 | |
| 75 | pagevec_reinit(pvec); |
| 76 | } |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 79 | { |
Josef Sipek | b39424e | 2006-12-08 02:37:07 -0800 | [diff] [blame] | 80 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | loff_t len, vma_len; |
| 82 | int ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 83 | struct hstate *h = hstate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 85 | /* |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 86 | * vma address alignment (but not the pgoff alignment) has |
| 87 | * already been checked by prepare_hugepage_range. If you add |
| 88 | * any error returns here, do so after setting VM_HUGETLB, so |
| 89 | * is_vm_hugetlb_page tests below unmap_region go the right |
| 90 | * way when do_mmap_pgoff unwinds (may be important on powerpc |
| 91 | * and ia64). |
Hugh Dickins | 68589bc | 2006-11-14 02:03:32 -0800 | [diff] [blame] | 92 | */ |
| 93 | vma->vm_flags |= VM_HUGETLB | VM_RESERVED; |
| 94 | vma->vm_ops = &hugetlb_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 96 | if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) |
David Gibson | dec4ad8 | 2007-08-30 23:56:40 -0700 | [diff] [blame] | 97 | return -EINVAL; |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | vma_len = (loff_t)(vma->vm_end - vma->vm_start); |
| 100 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 101 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | file_accessed(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | ret = -ENOMEM; |
| 105 | len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 107 | if (hugetlb_reserve_pages(inode, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 108 | vma->vm_pgoff >> huge_page_order(h), |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 109 | len >> huge_page_shift(h), vma, |
| 110 | vma->vm_flags)) |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 111 | goto out; |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 112 | |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 113 | ret = 0; |
| 114 | hugetlb_prefault_arch_hook(vma->vm_mm); |
Zhang, Yanmin | b6174df | 2006-07-10 04:44:49 -0700 | [diff] [blame] | 115 | if (vma->vm_flags & VM_WRITE && inode->i_size < len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | inode->i_size = len; |
| 117 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 118 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | /* |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 124 | * Called under down_write(mmap_sem). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | */ |
| 126 | |
Adrian Bunk | d2ba27e8 | 2007-05-06 14:49:00 -0700 | [diff] [blame] | 127 | #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | static unsigned long |
| 129 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, |
| 130 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 131 | { |
| 132 | struct mm_struct *mm = current->mm; |
| 133 | struct vm_area_struct *vma; |
| 134 | unsigned long start_addr; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 135 | struct hstate *h = hstate_file(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 137 | if (len & ~huge_page_mask(h)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return -EINVAL; |
| 139 | if (len > TASK_SIZE) |
| 140 | return -ENOMEM; |
| 141 | |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 142 | if (flags & MAP_FIXED) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 143 | if (prepare_hugepage_range(file, addr, len)) |
Benjamin Herrenschmidt | 036e085 | 2007-05-06 14:50:12 -0700 | [diff] [blame] | 144 | return -EINVAL; |
| 145 | return addr; |
| 146 | } |
| 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | if (addr) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 149 | addr = ALIGN(addr, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | vma = find_vma(mm, addr); |
| 151 | if (TASK_SIZE - len >= addr && |
| 152 | (!vma || addr + len <= vma->vm_start)) |
| 153 | return addr; |
| 154 | } |
| 155 | |
| 156 | start_addr = mm->free_area_cache; |
| 157 | |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 158 | if (len <= mm->cached_hole_size) |
| 159 | start_addr = TASK_UNMAPPED_BASE; |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | full_search: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 162 | addr = ALIGN(start_addr, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
| 165 | /* At this point: (!vma || addr < vma->vm_end). */ |
| 166 | if (TASK_SIZE - len < addr) { |
| 167 | /* |
| 168 | * Start a new search - just in case we missed |
| 169 | * some holes. |
| 170 | */ |
| 171 | if (start_addr != TASK_UNMAPPED_BASE) { |
| 172 | start_addr = TASK_UNMAPPED_BASE; |
| 173 | goto full_search; |
| 174 | } |
| 175 | return -ENOMEM; |
| 176 | } |
| 177 | |
| 178 | if (!vma || addr + len <= vma->vm_start) |
| 179 | return addr; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 180 | addr = ALIGN(vma->vm_end, huge_page_size(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
| 182 | } |
| 183 | #endif |
| 184 | |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 185 | static int |
| 186 | hugetlbfs_read_actor(struct page *page, unsigned long offset, |
| 187 | char __user *buf, unsigned long count, |
| 188 | unsigned long size) |
| 189 | { |
| 190 | char *kaddr; |
| 191 | unsigned long left, copied = 0; |
| 192 | int i, chunksize; |
| 193 | |
| 194 | if (size > count) |
| 195 | size = count; |
| 196 | |
| 197 | /* Find which 4k chunk and offset with in that chunk */ |
| 198 | i = offset >> PAGE_CACHE_SHIFT; |
| 199 | offset = offset & ~PAGE_CACHE_MASK; |
| 200 | |
| 201 | while (size) { |
| 202 | chunksize = PAGE_CACHE_SIZE; |
| 203 | if (offset) |
| 204 | chunksize -= offset; |
| 205 | if (chunksize > size) |
| 206 | chunksize = size; |
| 207 | kaddr = kmap(&page[i]); |
| 208 | left = __copy_to_user(buf, kaddr + offset, chunksize); |
| 209 | kunmap(&page[i]); |
| 210 | if (left) { |
| 211 | copied += (chunksize - left); |
| 212 | break; |
| 213 | } |
| 214 | offset = 0; |
| 215 | size -= chunksize; |
| 216 | buf += chunksize; |
| 217 | copied += chunksize; |
| 218 | i++; |
| 219 | } |
| 220 | return copied ? copied : -EFAULT; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Support for read() - Find the page attached to f_mapping and copy out the |
| 225 | * data. Its *very* similar to do_generic_mapping_read(), we can't use that |
| 226 | * since it has PAGE_CACHE_SIZE assumptions. |
| 227 | */ |
| 228 | static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, |
| 229 | size_t len, loff_t *ppos) |
| 230 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 231 | struct hstate *h = hstate_file(filp); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 232 | struct address_space *mapping = filp->f_mapping; |
| 233 | struct inode *inode = mapping->host; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 234 | unsigned long index = *ppos >> huge_page_shift(h); |
| 235 | unsigned long offset = *ppos & ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 236 | unsigned long end_index; |
| 237 | loff_t isize; |
| 238 | ssize_t retval = 0; |
| 239 | |
| 240 | mutex_lock(&inode->i_mutex); |
| 241 | |
| 242 | /* validate length */ |
| 243 | if (len == 0) |
| 244 | goto out; |
| 245 | |
| 246 | isize = i_size_read(inode); |
| 247 | if (!isize) |
| 248 | goto out; |
| 249 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 250 | end_index = (isize - 1) >> huge_page_shift(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 251 | for (;;) { |
| 252 | struct page *page; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 253 | unsigned long nr, ret; |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 254 | int ra; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 255 | |
| 256 | /* nr is the maximum number of bytes to copy from this page */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 257 | nr = huge_page_size(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 258 | if (index >= end_index) { |
| 259 | if (index > end_index) |
| 260 | goto out; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 261 | nr = ((isize - 1) & ~huge_page_mask(h)) + 1; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 262 | if (nr <= offset) { |
| 263 | goto out; |
| 264 | } |
| 265 | } |
| 266 | nr = nr - offset; |
| 267 | |
| 268 | /* Find the page */ |
| 269 | page = find_get_page(mapping, index); |
| 270 | if (unlikely(page == NULL)) { |
| 271 | /* |
| 272 | * We have a HOLE, zero out the user-buffer for the |
| 273 | * length of the hole or request. |
| 274 | */ |
| 275 | ret = len < nr ? len : nr; |
| 276 | if (clear_user(buf, ret)) |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 277 | ra = -EFAULT; |
| 278 | else |
| 279 | ra = 0; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 280 | } else { |
| 281 | /* |
| 282 | * We have the page, copy it to user space buffer. |
| 283 | */ |
Roel Kluin | 91bf189c | 2009-01-06 14:40:14 -0800 | [diff] [blame] | 284 | ra = hugetlbfs_read_actor(page, offset, buf, len, nr); |
| 285 | ret = ra; |
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 | if (page) |
| 291 | page_cache_release(page); |
| 292 | goto out; |
| 293 | } |
| 294 | |
| 295 | offset += ret; |
| 296 | retval += ret; |
| 297 | len -= ret; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 298 | index += offset >> huge_page_shift(h); |
| 299 | offset &= ~huge_page_mask(h); |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 300 | |
| 301 | if (page) |
| 302 | page_cache_release(page); |
| 303 | |
| 304 | /* short read or no more work */ |
| 305 | if ((ret != nr) || (len == 0)) |
| 306 | break; |
| 307 | } |
| 308 | out: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 309 | *ppos = ((loff_t)index << huge_page_shift(h)) + offset; |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 310 | mutex_unlock(&inode->i_mutex); |
| 311 | return retval; |
| 312 | } |
| 313 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 314 | static int hugetlbfs_write_begin(struct file *file, |
| 315 | struct address_space *mapping, |
| 316 | loff_t pos, unsigned len, unsigned flags, |
| 317 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | { |
| 319 | return -EINVAL; |
| 320 | } |
| 321 | |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 322 | static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, |
| 323 | loff_t pos, unsigned len, unsigned copied, |
| 324 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 326 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | return -EINVAL; |
| 328 | } |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | static void truncate_huge_page(struct page *page) |
| 331 | { |
Linus Torvalds | fba2591 | 2006-12-20 13:46:42 -0800 | [diff] [blame] | 332 | cancel_dirty_page(page, /* No IO accounting for huge pages? */0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | ClearPageUptodate(page); |
| 334 | remove_from_page_cache(page); |
| 335 | put_page(page); |
| 336 | } |
| 337 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 338 | static void truncate_hugepages(struct inode *inode, loff_t lstart) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 340 | struct hstate *h = hstate_inode(inode); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 341 | struct address_space *mapping = &inode->i_data; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 342 | const pgoff_t start = lstart >> huge_page_shift(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | struct pagevec pvec; |
| 344 | pgoff_t next; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 345 | int i, freed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
| 347 | pagevec_init(&pvec, 0); |
| 348 | next = start; |
| 349 | while (1) { |
| 350 | if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { |
| 351 | if (next == start) |
| 352 | break; |
| 353 | next = start; |
| 354 | continue; |
| 355 | } |
| 356 | |
| 357 | for (i = 0; i < pagevec_count(&pvec); ++i) { |
| 358 | struct page *page = pvec.pages[i]; |
| 359 | |
| 360 | lock_page(page); |
| 361 | if (page->index > next) |
| 362 | next = page->index; |
| 363 | ++next; |
| 364 | truncate_huge_page(page); |
| 365 | unlock_page(page); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 366 | freed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
| 368 | huge_pagevec_release(&pvec); |
| 369 | } |
| 370 | BUG_ON(!lstart && mapping->nrpages); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 371 | hugetlb_unreserve_pages(inode, start, freed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | static void hugetlbfs_delete_inode(struct inode *inode) |
| 375 | { |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 376 | truncate_hugepages(inode, 0); |
Christoph Hellwig | 149f421 | 2005-10-29 18:16:43 -0700 | [diff] [blame] | 377 | clear_inode(inode); |
| 378 | } |
| 379 | |
Josh Triplett | ddc0a51 | 2006-09-29 01:59:27 -0700 | [diff] [blame] | 380 | static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | { |
Jan Kara | 22fe4042 | 2009-09-18 13:05:44 -0700 | [diff] [blame] | 382 | if (generic_detach_inode(inode)) { |
| 383 | truncate_hugepages(inode, 0); |
| 384 | clear_inode(inode); |
| 385 | destroy_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | static void hugetlbfs_drop_inode(struct inode *inode) |
| 390 | { |
| 391 | if (!inode->i_nlink) |
Christoph Hellwig | 6b09b9d | 2005-10-29 18:16:44 -0700 | [diff] [blame] | 392 | generic_delete_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | else |
| 394 | hugetlbfs_forget_inode(inode); |
| 395 | } |
| 396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | static inline void |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 398 | hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
| 400 | struct vm_area_struct *vma; |
| 401 | struct prio_tree_iter iter; |
| 402 | |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 403 | vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | unsigned long v_offset; |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | /* |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 407 | * Can the expression below overflow on 32-bit arches? |
| 408 | * No, because the prio_tree returns us only those vmas |
| 409 | * which overlap the truncated area starting at pgoff, |
| 410 | * 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] | 411 | */ |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 412 | if (vma->vm_pgoff < pgoff) |
| 413 | v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; |
| 414 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | v_offset = 0; |
| 416 | |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 417 | __unmap_hugepage_range(vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 418 | vma->vm_start + v_offset, vma->vm_end, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | } |
| 421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) |
| 423 | { |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 424 | pgoff_t pgoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | struct address_space *mapping = inode->i_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 426 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 428 | BUG_ON(offset & ~huge_page_mask(h)); |
Hugh Dickins | 856fc29 | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 429 | pgoff = offset >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Ken Chen | 7aa91e1 | 2007-10-16 01:26:21 -0700 | [diff] [blame] | 431 | i_size_write(inode, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | spin_lock(&mapping->i_mmap_lock); |
| 433 | if (!prio_tree_empty(&mapping->i_mmap)) |
| 434 | hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); |
| 435 | spin_unlock(&mapping->i_mmap_lock); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 436 | truncate_hugepages(inode, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 441 | { |
| 442 | struct inode *inode = dentry->d_inode; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 443 | struct hstate *h = hstate_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | int error; |
| 445 | unsigned int ia_valid = attr->ia_valid; |
| 446 | |
| 447 | BUG_ON(!inode); |
| 448 | |
| 449 | error = inode_change_ok(inode, attr); |
| 450 | if (error) |
| 451 | goto out; |
| 452 | |
| 453 | if (ia_valid & ATTR_SIZE) { |
| 454 | error = -EINVAL; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 455 | if (!(attr->ia_size & ~huge_page_mask(h))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | error = hugetlb_vmtruncate(inode, attr->ia_size); |
| 457 | if (error) |
| 458 | goto out; |
| 459 | attr->ia_valid &= ~ATTR_SIZE; |
| 460 | } |
| 461 | error = inode_setattr(inode, attr); |
| 462 | out: |
| 463 | return error; |
| 464 | } |
| 465 | |
| 466 | static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, |
| 467 | gid_t gid, int mode, dev_t dev) |
| 468 | { |
| 469 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | inode = new_inode(sb); |
| 472 | if (inode) { |
| 473 | struct hugetlbfs_inode_info *info; |
| 474 | inode->i_mode = mode; |
| 475 | inode->i_uid = uid; |
| 476 | inode->i_gid = gid; |
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 | } |
| 509 | } |
| 510 | return inode; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * File creation. Allocate an inode, and we're done.. |
| 515 | */ |
| 516 | static int hugetlbfs_mknod(struct inode *dir, |
| 517 | struct dentry *dentry, int mode, dev_t dev) |
| 518 | { |
| 519 | struct inode *inode; |
| 520 | int error = -ENOSPC; |
| 521 | gid_t gid; |
| 522 | |
| 523 | if (dir->i_mode & S_ISGID) { |
| 524 | gid = dir->i_gid; |
| 525 | if (S_ISDIR(mode)) |
| 526 | mode |= S_ISGID; |
| 527 | } else { |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 528 | gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 530 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | if (inode) { |
| 532 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 533 | d_instantiate(dentry, inode); |
| 534 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 535 | error = 0; |
| 536 | } |
| 537 | return error; |
| 538 | } |
| 539 | |
| 540 | static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 541 | { |
| 542 | int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); |
| 543 | if (!retval) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 544 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | return retval; |
| 546 | } |
| 547 | |
| 548 | static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) |
| 549 | { |
| 550 | return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); |
| 551 | } |
| 552 | |
| 553 | static int hugetlbfs_symlink(struct inode *dir, |
| 554 | struct dentry *dentry, const char *symname) |
| 555 | { |
| 556 | struct inode *inode; |
| 557 | int error = -ENOSPC; |
| 558 | gid_t gid; |
| 559 | |
| 560 | if (dir->i_mode & S_ISGID) |
| 561 | gid = dir->i_gid; |
| 562 | else |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 563 | gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 565 | inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | gid, S_IFLNK|S_IRWXUGO, 0); |
| 567 | if (inode) { |
| 568 | int l = strlen(symname)+1; |
| 569 | error = page_symlink(inode, symname, l); |
| 570 | if (!error) { |
| 571 | d_instantiate(dentry, inode); |
| 572 | dget(dentry); |
| 573 | } else |
| 574 | iput(inode); |
| 575 | } |
| 576 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
| 577 | |
| 578 | return error; |
| 579 | } |
| 580 | |
| 581 | /* |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 582 | * mark the head page dirty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | */ |
| 584 | static int hugetlbfs_set_page_dirty(struct page *page) |
| 585 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 586 | struct page *head = compound_head(page); |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 587 | |
| 588 | SetPageDirty(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | return 0; |
| 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() */ |
| 603 | if (sbinfo->max_blocks >= 0) { |
| 604 | buf->f_blocks = sbinfo->max_blocks; |
| 605 | buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; |
| 606 | buf->f_files = sbinfo->max_inodes; |
| 607 | buf->f_ffree = sbinfo->free_inodes; |
| 608 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | spin_unlock(&sbinfo->stat_lock); |
| 610 | } |
| 611 | buf->f_namelen = NAME_MAX; |
| 612 | return 0; |
| 613 | } |
| 614 | |
| 615 | static void hugetlbfs_put_super(struct super_block *sb) |
| 616 | { |
| 617 | struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); |
| 618 | |
| 619 | if (sbi) { |
| 620 | sb->s_fs_info = NULL; |
| 621 | kfree(sbi); |
| 622 | } |
| 623 | } |
| 624 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 625 | static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 626 | { |
| 627 | if (sbinfo->free_inodes >= 0) { |
| 628 | spin_lock(&sbinfo->stat_lock); |
| 629 | if (unlikely(!sbinfo->free_inodes)) { |
| 630 | spin_unlock(&sbinfo->stat_lock); |
| 631 | return 0; |
| 632 | } |
| 633 | sbinfo->free_inodes--; |
| 634 | spin_unlock(&sbinfo->stat_lock); |
| 635 | } |
| 636 | |
| 637 | return 1; |
| 638 | } |
| 639 | |
| 640 | static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) |
| 641 | { |
| 642 | if (sbinfo->free_inodes >= 0) { |
| 643 | spin_lock(&sbinfo->stat_lock); |
| 644 | sbinfo->free_inodes++; |
| 645 | spin_unlock(&sbinfo->stat_lock); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 650 | static struct kmem_cache *hugetlbfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
| 652 | static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) |
| 653 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 654 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | struct hugetlbfs_inode_info *p; |
| 656 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 657 | if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | return NULL; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 659 | p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 660 | if (unlikely(!p)) { |
| 661 | hugetlbfs_inc_free_inodes(sbinfo); |
| 662 | return NULL; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | return &p->vfs_inode; |
| 665 | } |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | static void hugetlbfs_destroy_inode(struct inode *inode) |
| 668 | { |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 669 | hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); |
| 671 | kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); |
| 672 | } |
| 673 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 674 | static const struct address_space_operations hugetlbfs_aops = { |
Nick Piggin | 800d15a | 2007-10-16 01:25:03 -0700 | [diff] [blame] | 675 | .write_begin = hugetlbfs_write_begin, |
| 676 | .write_end = hugetlbfs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | .set_page_dirty = hugetlbfs_set_page_dirty, |
| 678 | }; |
| 679 | |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 680 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 681 | static void init_once(void *foo) |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 682 | { |
| 683 | struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; |
| 684 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 685 | inode_init_once(&ei->vfs_inode); |
Christoph Hellwig | 9652798 | 2005-10-29 18:16:42 -0700 | [diff] [blame] | 686 | } |
| 687 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 688 | const struct file_operations hugetlbfs_file_operations = { |
Badari Pulavarty | e63e1e5 | 2007-10-16 01:26:22 -0700 | [diff] [blame] | 689 | .read = hugetlbfs_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | .mmap = hugetlbfs_file_mmap, |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 691 | .fsync = noop_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | .get_unmapped_area = hugetlb_get_unmapped_area, |
| 693 | }; |
| 694 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 695 | static const struct inode_operations hugetlbfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | .create = hugetlbfs_create, |
| 697 | .lookup = simple_lookup, |
| 698 | .link = simple_link, |
| 699 | .unlink = simple_unlink, |
| 700 | .symlink = hugetlbfs_symlink, |
| 701 | .mkdir = hugetlbfs_mkdir, |
| 702 | .rmdir = simple_rmdir, |
| 703 | .mknod = hugetlbfs_mknod, |
| 704 | .rename = simple_rename, |
| 705 | .setattr = hugetlbfs_setattr, |
| 706 | }; |
| 707 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 708 | static const struct inode_operations hugetlbfs_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | .setattr = hugetlbfs_setattr, |
| 710 | }; |
| 711 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 712 | static const struct super_operations hugetlbfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | .alloc_inode = hugetlbfs_alloc_inode, |
| 714 | .destroy_inode = hugetlbfs_destroy_inode, |
| 715 | .statfs = hugetlbfs_statfs, |
Christoph Hellwig | 149f421 | 2005-10-29 18:16:43 -0700 | [diff] [blame] | 716 | .delete_inode = hugetlbfs_delete_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | .drop_inode = hugetlbfs_drop_inode, |
| 718 | .put_super = hugetlbfs_put_super, |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 719 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | }; |
| 721 | |
| 722 | static int |
| 723 | hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) |
| 724 | { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 725 | char *p, *rest; |
| 726 | substring_t args[MAX_OPT_ARGS]; |
| 727 | int option; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 728 | unsigned long long size = 0; |
| 729 | enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | if (!options) |
| 732 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 734 | while ((p = strsep(&options, ",")) != NULL) { |
| 735 | int token; |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 736 | if (!*p) |
| 737 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 739 | token = match_token(p, tokens, args); |
| 740 | switch (token) { |
| 741 | case Opt_uid: |
| 742 | if (match_int(&args[0], &option)) |
| 743 | goto bad_val; |
| 744 | pconfig->uid = option; |
| 745 | break; |
| 746 | |
| 747 | case Opt_gid: |
| 748 | if (match_int(&args[0], &option)) |
| 749 | goto bad_val; |
| 750 | pconfig->gid = option; |
| 751 | break; |
| 752 | |
| 753 | case Opt_mode: |
| 754 | if (match_octal(&args[0], &option)) |
| 755 | goto bad_val; |
Ken Chen | 75897d6 | 2008-02-04 22:28:36 -0800 | [diff] [blame] | 756 | pconfig->mode = option & 01777U; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 757 | break; |
| 758 | |
| 759 | case Opt_size: { |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 760 | /* memparse() will accept a K/M/G without a digit */ |
| 761 | if (!isdigit(*args[0].from)) |
| 762 | goto bad_val; |
| 763 | size = memparse(args[0].from, &rest); |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 764 | setsize = SIZE_STD; |
| 765 | if (*rest == '%') |
| 766 | setsize = SIZE_PERCENT; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 767 | break; |
| 768 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 770 | case Opt_nr_inodes: |
| 771 | /* memparse() will accept a K/M/G without a digit */ |
| 772 | if (!isdigit(*args[0].from)) |
| 773 | goto bad_val; |
| 774 | pconfig->nr_inodes = memparse(args[0].from, &rest); |
| 775 | break; |
| 776 | |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 777 | case Opt_pagesize: { |
| 778 | unsigned long ps; |
| 779 | ps = memparse(args[0].from, &rest); |
| 780 | pconfig->hstate = size_to_hstate(ps); |
| 781 | if (!pconfig->hstate) { |
| 782 | printk(KERN_ERR |
| 783 | "hugetlbfs: Unsupported page size %lu MB\n", |
| 784 | ps >> 20); |
| 785 | return -EINVAL; |
| 786 | } |
| 787 | break; |
| 788 | } |
| 789 | |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 790 | default: |
Lee Schermerhorn | b4c07bc | 2007-07-15 23:40:54 -0700 | [diff] [blame] | 791 | printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", |
| 792 | p); |
| 793 | return -EINVAL; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 794 | break; |
| 795 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 797 | |
| 798 | /* Do size after hstate is set up */ |
| 799 | if (setsize > NO_SIZE) { |
| 800 | struct hstate *h = pconfig->hstate; |
| 801 | if (setsize == SIZE_PERCENT) { |
| 802 | size <<= huge_page_shift(h); |
| 803 | size *= h->max_huge_pages; |
| 804 | do_div(size, 100); |
| 805 | } |
| 806 | pconfig->nr_blocks = (size >> huge_page_shift(h)); |
| 807 | } |
| 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | return 0; |
Randy Dunlap | e73a75f | 2007-07-15 23:40:52 -0700 | [diff] [blame] | 810 | |
| 811 | bad_val: |
| 812 | printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", |
| 813 | args[0].from, p); |
Akinobu Mita | c12ddba | 2009-04-21 12:24:05 -0700 | [diff] [blame] | 814 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | static int |
| 818 | hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) |
| 819 | { |
| 820 | struct inode * inode; |
| 821 | struct dentry * root; |
| 822 | int ret; |
| 823 | struct hugetlbfs_config config; |
| 824 | struct hugetlbfs_sb_info *sbinfo; |
| 825 | |
Miklos Szeredi | 10f19a8 | 2008-02-08 04:21:45 -0800 | [diff] [blame] | 826 | save_mount_options(sb, data); |
| 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | config.nr_blocks = -1; /* No limit on size by default */ |
| 829 | config.nr_inodes = -1; /* No limit on number of inodes by default */ |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 830 | config.uid = current_fsuid(); |
| 831 | config.gid = current_fsgid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | config.mode = 0755; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 833 | config.hstate = &default_hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | ret = hugetlbfs_parse_options(data, &config); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | if (ret) |
| 836 | return ret; |
| 837 | |
| 838 | sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); |
| 839 | if (!sbinfo) |
| 840 | return -ENOMEM; |
| 841 | sb->s_fs_info = sbinfo; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 842 | sbinfo->hstate = config.hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | spin_lock_init(&sbinfo->stat_lock); |
| 844 | sbinfo->max_blocks = config.nr_blocks; |
| 845 | sbinfo->free_blocks = config.nr_blocks; |
| 846 | sbinfo->max_inodes = config.nr_inodes; |
| 847 | sbinfo->free_inodes = config.nr_inodes; |
| 848 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 849 | sb->s_blocksize = huge_page_size(config.hstate); |
| 850 | sb->s_blocksize_bits = huge_page_shift(config.hstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | sb->s_magic = HUGETLBFS_MAGIC; |
| 852 | sb->s_op = &hugetlbfs_ops; |
| 853 | sb->s_time_gran = 1; |
| 854 | inode = hugetlbfs_get_inode(sb, config.uid, config.gid, |
| 855 | S_IFDIR | config.mode, 0); |
| 856 | if (!inode) |
| 857 | goto out_free; |
| 858 | |
| 859 | root = d_alloc_root(inode); |
| 860 | if (!root) { |
| 861 | iput(inode); |
| 862 | goto out_free; |
| 863 | } |
| 864 | sb->s_root = root; |
| 865 | return 0; |
| 866 | out_free: |
| 867 | kfree(sbinfo); |
| 868 | return -ENOMEM; |
| 869 | } |
| 870 | |
Adam Litke | 9a119c0 | 2007-11-14 16:59:41 -0800 | [diff] [blame] | 871 | int hugetlb_get_quota(struct address_space *mapping, long delta) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | { |
| 873 | int ret = 0; |
| 874 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); |
| 875 | |
| 876 | if (sbinfo->free_blocks > -1) { |
| 877 | spin_lock(&sbinfo->stat_lock); |
Adam Litke | 9a119c0 | 2007-11-14 16:59:41 -0800 | [diff] [blame] | 878 | if (sbinfo->free_blocks - delta >= 0) |
| 879 | sbinfo->free_blocks -= delta; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | else |
| 881 | ret = -ENOMEM; |
| 882 | spin_unlock(&sbinfo->stat_lock); |
| 883 | } |
| 884 | |
| 885 | return ret; |
| 886 | } |
| 887 | |
Adam Litke | 9a119c0 | 2007-11-14 16:59:41 -0800 | [diff] [blame] | 888 | void hugetlb_put_quota(struct address_space *mapping, long delta) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | { |
| 890 | struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); |
| 891 | |
| 892 | if (sbinfo->free_blocks > -1) { |
| 893 | spin_lock(&sbinfo->stat_lock); |
Adam Litke | 9a119c0 | 2007-11-14 16:59:41 -0800 | [diff] [blame] | 894 | sbinfo->free_blocks += delta; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | spin_unlock(&sbinfo->stat_lock); |
| 896 | } |
| 897 | } |
| 898 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 899 | static int hugetlbfs_get_sb(struct file_system_type *fs_type, |
| 900 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 902 | return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | static struct file_system_type hugetlbfs_fs_type = { |
| 906 | .name = "hugetlbfs", |
| 907 | .get_sb = hugetlbfs_get_sb, |
| 908 | .kill_sb = kill_litter_super, |
| 909 | }; |
| 910 | |
| 911 | static struct vfsmount *hugetlbfs_vfsmount; |
| 912 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 913 | static int can_do_hugetlb_shm(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | { |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 915 | return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 918 | struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag, |
Eric B Munson | 6bfde05 | 2009-09-21 17:03:43 -0700 | [diff] [blame] | 919 | struct user_struct **user, int creat_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | { |
| 921 | int error = -ENOMEM; |
| 922 | struct file *file; |
| 923 | struct inode *inode; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 924 | struct path path; |
| 925 | struct dentry *root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | struct qstr quick_string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 928 | *user = NULL; |
Akinobu Mita | 5bc9859 | 2007-05-06 14:50:18 -0700 | [diff] [blame] | 929 | if (!hugetlbfs_vfsmount) |
| 930 | return ERR_PTR(-ENOENT); |
| 931 | |
From: Mel Gorman | ef1ff6b | 2009-09-23 15:56:05 -0700 | [diff] [blame] | 932 | if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 933 | *user = current_user(); |
| 934 | if (user_shm_lock(size, *user)) { |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 935 | WARN_ONCE(1, |
| 936 | "Using mlock ulimits for SHM_HUGETLB deprecated\n"); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 937 | } else { |
| 938 | *user = NULL; |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 939 | return ERR_PTR(-EPERM); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 940 | } |
Ravikiran G Thirumalai | 2584e51 | 2009-03-31 15:21:26 -0700 | [diff] [blame] | 941 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | root = hugetlbfs_vfsmount->mnt_root; |
Eric W. Biederman | 9d66586 | 2007-06-16 10:16:16 -0700 | [diff] [blame] | 944 | quick_string.name = name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | quick_string.len = strlen(quick_string.name); |
| 946 | quick_string.hash = 0; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 947 | path.dentry = d_alloc(root, &quick_string); |
| 948 | if (!path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | goto out_shm_unlock; |
| 950 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 951 | path.mnt = mntget(hugetlbfs_vfsmount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | error = -ENOSPC; |
David Howells | 77c70de | 2008-11-14 10:38:56 +1100 | [diff] [blame] | 953 | inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(), |
| 954 | current_fsgid(), S_IFREG | S_IRWXUGO, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | if (!inode) |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 956 | goto out_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 958 | error = -ENOMEM; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 959 | if (hugetlb_reserve_pages(inode, 0, |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 960 | size >> huge_page_shift(hstate_inode(inode)), NULL, |
| 961 | acctflag)) |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 962 | goto out_inode; |
| 963 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 964 | d_instantiate(path.dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | inode->i_size = size; |
| 966 | inode->i_nlink = 0; |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 967 | |
| 968 | error = -ENFILE; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 969 | file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 970 | &hugetlbfs_file_operations); |
| 971 | if (!file) |
Al Viro | b4d232e | 2008-02-23 05:59:19 -0500 | [diff] [blame] | 972 | goto out_dentry; /* inode is already attached */ |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 973 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | return file; |
| 975 | |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 976 | out_inode: |
| 977 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | out_dentry: |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 979 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | out_shm_unlock: |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 981 | if (*user) { |
| 982 | user_shm_unlock(size, *user); |
| 983 | *user = NULL; |
| 984 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | return ERR_PTR(error); |
| 986 | } |
| 987 | |
| 988 | static int __init init_hugetlbfs_fs(void) |
| 989 | { |
| 990 | int error; |
| 991 | struct vfsmount *vfsmount; |
| 992 | |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 993 | error = bdi_init(&hugetlbfs_backing_dev_info); |
| 994 | if (error) |
| 995 | return error; |
| 996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", |
| 998 | sizeof(struct hugetlbfs_inode_info), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 999 | 0, 0, init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | if (hugetlbfs_inode_cachep == NULL) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1001 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | |
| 1003 | error = register_filesystem(&hugetlbfs_fs_type); |
| 1004 | if (error) |
| 1005 | goto out; |
| 1006 | |
| 1007 | vfsmount = kern_mount(&hugetlbfs_fs_type); |
| 1008 | |
| 1009 | if (!IS_ERR(vfsmount)) { |
| 1010 | hugetlbfs_vfsmount = vfsmount; |
| 1011 | return 0; |
| 1012 | } |
| 1013 | |
| 1014 | error = PTR_ERR(vfsmount); |
| 1015 | |
| 1016 | out: |
| 1017 | if (error) |
| 1018 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1019 | out2: |
| 1020 | bdi_destroy(&hugetlbfs_backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | return error; |
| 1022 | } |
| 1023 | |
| 1024 | static void __exit exit_hugetlbfs_fs(void) |
| 1025 | { |
| 1026 | kmem_cache_destroy(hugetlbfs_inode_cachep); |
| 1027 | unregister_filesystem(&hugetlbfs_fs_type); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 1028 | bdi_destroy(&hugetlbfs_backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
| 1031 | module_init(init_hugetlbfs_fs) |
| 1032 | module_exit(exit_hugetlbfs_fs) |
| 1033 | |
| 1034 | MODULE_LICENSE("GPL"); |