2 * hugetlbpage-backed filesystem. Based on ramfs.
6 * Copyright (C) 2002 Linus Torvalds.
9 #include <linux/module.h>
10 #include <linux/thread_info.h>
11 #include <asm/current.h>
12 #include <linux/sched.h> /* remove ASAP */
14 #include <linux/mount.h>
15 #include <linux/file.h>
16 #include <linux/kernel.h>
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>
22 #include <linux/capability.h>
23 #include <linux/ctype.h>
24 #include <linux/backing-dev.h>
25 #include <linux/hugetlb.h>
26 #include <linux/pagevec.h>
27 #include <linux/parser.h>
28 #include <linux/mman.h>
29 #include <linux/slab.h>
30 #include <linux/dnotify.h>
31 #include <linux/statfs.h>
32 #include <linux/security.h>
33 #include <linux/magic.h>
34 #include <linux/migrate.h>
36 #include <asm/uaccess.h>
38 static const struct super_operations hugetlbfs_ops;
39 static const struct address_space_operations hugetlbfs_aops;
40 const struct file_operations hugetlbfs_file_operations;
41 static const struct inode_operations hugetlbfs_dir_inode_operations;
42 static const struct inode_operations hugetlbfs_inode_operations;
44 static struct backing_dev_info hugetlbfs_backing_dev_info = {
46 .ra_pages = 0, /* No readahead */
47 .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
50 int sysctl_hugetlb_shm_group;
53 Opt_size, Opt_nr_inodes,
54 Opt_mode, Opt_uid, Opt_gid,
59 static const match_table_t tokens = {
60 {Opt_size, "size=%s"},
61 {Opt_nr_inodes, "nr_inodes=%s"},
62 {Opt_mode, "mode=%o"},
65 {Opt_pagesize, "pagesize=%s"},
69 static void huge_pagevec_release(struct pagevec *pvec)
73 for (i = 0; i < pagevec_count(pvec); ++i)
74 put_page(pvec->pages[i]);
79 static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
81 struct inode *inode = file->f_path.dentry->d_inode;
84 struct hstate *h = hstate_file(file);
87 * vma address alignment (but not the pgoff alignment) has
88 * already been checked by prepare_hugepage_range. If you add
89 * any error returns here, do so after setting VM_HUGETLB, so
90 * is_vm_hugetlb_page tests below unmap_region go the right
91 * way when do_mmap_pgoff unwinds (may be important on powerpc
94 vma->vm_flags |= VM_HUGETLB | VM_RESERVED;
95 vma->vm_ops = &hugetlb_vm_ops;
97 if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT))
100 vma_len = (loff_t)(vma->vm_end - vma->vm_start);
102 mutex_lock(&inode->i_mutex);
106 len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
108 if (hugetlb_reserve_pages(inode,
109 vma->vm_pgoff >> huge_page_order(h),
110 len >> huge_page_shift(h), vma,
115 hugetlb_prefault_arch_hook(vma->vm_mm);
116 if (vma->vm_flags & VM_WRITE && inode->i_size < len)
119 mutex_unlock(&inode->i_mutex);
125 * Called under down_write(mmap_sem).
128 #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
130 hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
131 unsigned long len, unsigned long pgoff, unsigned long flags)
133 struct mm_struct *mm = current->mm;
134 struct vm_area_struct *vma;
135 unsigned long start_addr;
136 struct hstate *h = hstate_file(file);
138 if (len & ~huge_page_mask(h))
143 if (flags & MAP_FIXED) {
144 if (prepare_hugepage_range(file, addr, len))
150 addr = ALIGN(addr, huge_page_size(h));
151 vma = find_vma(mm, addr);
152 if (TASK_SIZE - len >= addr &&
153 (!vma || addr + len <= vma->vm_start))
157 start_addr = mm->free_area_cache;
159 if (len <= mm->cached_hole_size)
160 start_addr = TASK_UNMAPPED_BASE;
163 addr = ALIGN(start_addr, huge_page_size(h));
165 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
166 /* At this point: (!vma || addr < vma->vm_end). */
167 if (TASK_SIZE - len < addr) {
169 * Start a new search - just in case we missed
172 if (start_addr != TASK_UNMAPPED_BASE) {
173 start_addr = TASK_UNMAPPED_BASE;
179 if (!vma || addr + len <= vma->vm_start)
181 addr = ALIGN(vma->vm_end, huge_page_size(h));
187 hugetlbfs_read_actor(struct page *page, unsigned long offset,
188 char __user *buf, unsigned long count,
192 unsigned long left, copied = 0;
198 /* Find which 4k chunk and offset with in that chunk */
199 i = offset >> PAGE_CACHE_SHIFT;
200 offset = offset & ~PAGE_CACHE_MASK;
203 chunksize = PAGE_CACHE_SIZE;
206 if (chunksize > size)
208 kaddr = kmap(&page[i]);
209 left = __copy_to_user(buf, kaddr + offset, chunksize);
212 copied += (chunksize - left);
221 return copied ? copied : -EFAULT;
225 * Support for read() - Find the page attached to f_mapping and copy out the
226 * data. Its *very* similar to do_generic_mapping_read(), we can't use that
227 * since it has PAGE_CACHE_SIZE assumptions.
229 static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
230 size_t len, loff_t *ppos)
232 struct hstate *h = hstate_file(filp);
233 struct address_space *mapping = filp->f_mapping;
234 struct inode *inode = mapping->host;
235 unsigned long index = *ppos >> huge_page_shift(h);
236 unsigned long offset = *ppos & ~huge_page_mask(h);
237 unsigned long end_index;
241 mutex_lock(&inode->i_mutex);
243 /* validate length */
247 isize = i_size_read(inode);
251 end_index = (isize - 1) >> huge_page_shift(h);
254 unsigned long nr, ret;
257 /* nr is the maximum number of bytes to copy from this page */
258 nr = huge_page_size(h);
259 if (index >= end_index) {
260 if (index > end_index)
262 nr = ((isize - 1) & ~huge_page_mask(h)) + 1;
270 page = find_get_page(mapping, index);
271 if (unlikely(page == NULL)) {
273 * We have a HOLE, zero out the user-buffer for the
274 * length of the hole or request.
276 ret = len < nr ? len : nr;
277 if (clear_user(buf, ret))
283 * We have the page, copy it to user space buffer.
285 ra = hugetlbfs_read_actor(page, offset, buf, len, nr);
292 page_cache_release(page);
299 index += offset >> huge_page_shift(h);
300 offset &= ~huge_page_mask(h);
303 page_cache_release(page);
305 /* short read or no more work */
306 if ((ret != nr) || (len == 0))
310 *ppos = ((loff_t)index << huge_page_shift(h)) + offset;
311 mutex_unlock(&inode->i_mutex);
315 static int hugetlbfs_write_begin(struct file *file,
316 struct address_space *mapping,
317 loff_t pos, unsigned len, unsigned flags,
318 struct page **pagep, void **fsdata)
323 static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
324 loff_t pos, unsigned len, unsigned copied,
325 struct page *page, void *fsdata)
331 static void truncate_huge_page(struct page *page)
333 cancel_dirty_page(page, /* No IO accounting for huge pages? */0);
334 ClearPageUptodate(page);
335 remove_from_page_cache(page);
339 static void truncate_hugepages(struct inode *inode, loff_t lstart)
341 struct hstate *h = hstate_inode(inode);
342 struct address_space *mapping = &inode->i_data;
343 const pgoff_t start = lstart >> huge_page_shift(h);
348 pagevec_init(&pvec, 0);
351 if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
358 for (i = 0; i < pagevec_count(&pvec); ++i) {
359 struct page *page = pvec.pages[i];
362 if (page->index > next)
365 truncate_huge_page(page);
369 huge_pagevec_release(&pvec);
371 BUG_ON(!lstart && mapping->nrpages);
372 hugetlb_unreserve_pages(inode, start, freed);
375 static void hugetlbfs_evict_inode(struct inode *inode)
377 truncate_hugepages(inode, 0);
378 end_writeback(inode);
382 hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff)
384 struct vm_area_struct *vma;
385 struct prio_tree_iter iter;
387 vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) {
388 unsigned long v_offset;
391 * Can the expression below overflow on 32-bit arches?
392 * No, because the prio_tree returns us only those vmas
393 * which overlap the truncated area starting at pgoff,
394 * and no vma on a 32-bit arch can span beyond the 4GB.
396 if (vma->vm_pgoff < pgoff)
397 v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT;
401 __unmap_hugepage_range(vma,
402 vma->vm_start + v_offset, vma->vm_end, NULL);
406 static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
409 struct address_space *mapping = inode->i_mapping;
410 struct hstate *h = hstate_inode(inode);
412 BUG_ON(offset & ~huge_page_mask(h));
413 pgoff = offset >> PAGE_SHIFT;
415 i_size_write(inode, offset);
416 spin_lock(&mapping->i_mmap_lock);
417 if (!prio_tree_empty(&mapping->i_mmap))
418 hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
419 spin_unlock(&mapping->i_mmap_lock);
420 truncate_hugepages(inode, offset);
424 static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
426 struct inode *inode = dentry->d_inode;
427 struct hstate *h = hstate_inode(inode);
429 unsigned int ia_valid = attr->ia_valid;
433 error = inode_change_ok(inode, attr);
437 if (ia_valid & ATTR_SIZE) {
439 if (attr->ia_size & ~huge_page_mask(h))
441 error = hugetlb_vmtruncate(inode, attr->ia_size);
446 setattr_copy(inode, attr);
447 mark_inode_dirty(inode);
451 static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
452 gid_t gid, int mode, dev_t dev)
456 inode = new_inode(sb);
458 struct hugetlbfs_inode_info *info;
459 inode->i_ino = get_next_ino();
460 inode->i_mode = mode;
463 inode->i_mapping->a_ops = &hugetlbfs_aops;
464 inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
465 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
466 INIT_LIST_HEAD(&inode->i_mapping->private_list);
467 info = HUGETLBFS_I(inode);
469 * The policy is initialized here even if we are creating a
470 * private inode because initialization simply creates an
471 * an empty rb tree and calls spin_lock_init(), later when we
472 * call mpol_free_shared_policy() it will just return because
473 * the rb tree will still be empty.
475 mpol_shared_policy_init(&info->policy, NULL);
476 switch (mode & S_IFMT) {
478 init_special_inode(inode, mode, dev);
481 inode->i_op = &hugetlbfs_inode_operations;
482 inode->i_fop = &hugetlbfs_file_operations;
485 inode->i_op = &hugetlbfs_dir_inode_operations;
486 inode->i_fop = &simple_dir_operations;
488 /* directory inodes start off with i_nlink == 2 (for "." entry) */
492 inode->i_op = &page_symlink_inode_operations;
500 * File creation. Allocate an inode, and we're done..
502 static int hugetlbfs_mknod(struct inode *dir,
503 struct dentry *dentry, int mode, dev_t dev)
509 if (dir->i_mode & S_ISGID) {
514 gid = current_fsgid();
516 inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev);
518 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
519 d_instantiate(dentry, inode);
520 dget(dentry); /* Extra count - pin the dentry in core */
526 static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
528 int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0);
534 static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
536 return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0);
539 static int hugetlbfs_symlink(struct inode *dir,
540 struct dentry *dentry, const char *symname)
546 if (dir->i_mode & S_ISGID)
549 gid = current_fsgid();
551 inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(),
552 gid, S_IFLNK|S_IRWXUGO, 0);
554 int l = strlen(symname)+1;
555 error = page_symlink(inode, symname, l);
557 d_instantiate(dentry, inode);
562 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
568 * mark the head page dirty
570 static int hugetlbfs_set_page_dirty(struct page *page)
572 struct page *head = compound_head(page);
578 static int hugetlbfs_migrate_page(struct address_space *mapping,
579 struct page *newpage, struct page *page)
583 rc = migrate_huge_page_move_mapping(mapping, newpage, page);
586 migrate_page_copy(newpage, page);
591 static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
593 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb);
594 struct hstate *h = hstate_inode(dentry->d_inode);
596 buf->f_type = HUGETLBFS_MAGIC;
597 buf->f_bsize = huge_page_size(h);
599 spin_lock(&sbinfo->stat_lock);
600 /* If no limits set, just report 0 for max/free/used
601 * blocks, like simple_statfs() */
602 if (sbinfo->max_blocks >= 0) {
603 buf->f_blocks = sbinfo->max_blocks;
604 buf->f_bavail = buf->f_bfree = sbinfo->free_blocks;
605 buf->f_files = sbinfo->max_inodes;
606 buf->f_ffree = sbinfo->free_inodes;
608 spin_unlock(&sbinfo->stat_lock);
610 buf->f_namelen = NAME_MAX;
614 static void hugetlbfs_put_super(struct super_block *sb)
616 struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb);
619 sb->s_fs_info = NULL;
624 static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo)
626 if (sbinfo->free_inodes >= 0) {
627 spin_lock(&sbinfo->stat_lock);
628 if (unlikely(!sbinfo->free_inodes)) {
629 spin_unlock(&sbinfo->stat_lock);
632 sbinfo->free_inodes--;
633 spin_unlock(&sbinfo->stat_lock);
639 static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo)
641 if (sbinfo->free_inodes >= 0) {
642 spin_lock(&sbinfo->stat_lock);
643 sbinfo->free_inodes++;
644 spin_unlock(&sbinfo->stat_lock);
649 static struct kmem_cache *hugetlbfs_inode_cachep;
651 static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
653 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
654 struct hugetlbfs_inode_info *p;
656 if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo)))
658 p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL);
660 hugetlbfs_inc_free_inodes(sbinfo);
663 return &p->vfs_inode;
666 static void hugetlbfs_destroy_inode(struct inode *inode)
668 hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb));
669 mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy);
670 kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
673 static const struct address_space_operations hugetlbfs_aops = {
674 .write_begin = hugetlbfs_write_begin,
675 .write_end = hugetlbfs_write_end,
676 .set_page_dirty = hugetlbfs_set_page_dirty,
677 .migratepage = hugetlbfs_migrate_page,
681 static void init_once(void *foo)
683 struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
685 inode_init_once(&ei->vfs_inode);
688 const struct file_operations hugetlbfs_file_operations = {
689 .read = hugetlbfs_read,
690 .mmap = hugetlbfs_file_mmap,
692 .get_unmapped_area = hugetlb_get_unmapped_area,
693 .llseek = default_llseek,
696 static const struct inode_operations hugetlbfs_dir_inode_operations = {
697 .create = hugetlbfs_create,
698 .lookup = simple_lookup,
700 .unlink = simple_unlink,
701 .symlink = hugetlbfs_symlink,
702 .mkdir = hugetlbfs_mkdir,
703 .rmdir = simple_rmdir,
704 .mknod = hugetlbfs_mknod,
705 .rename = simple_rename,
706 .setattr = hugetlbfs_setattr,
709 static const struct inode_operations hugetlbfs_inode_operations = {
710 .setattr = hugetlbfs_setattr,
713 static const struct super_operations hugetlbfs_ops = {
714 .alloc_inode = hugetlbfs_alloc_inode,
715 .destroy_inode = hugetlbfs_destroy_inode,
716 .evict_inode = hugetlbfs_evict_inode,
717 .statfs = hugetlbfs_statfs,
718 .put_super = hugetlbfs_put_super,
719 .show_options = generic_show_options,
723 hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
726 substring_t args[MAX_OPT_ARGS];
728 unsigned long long size = 0;
729 enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE;
734 while ((p = strsep(&options, ",")) != NULL) {
739 token = match_token(p, tokens, args);
742 if (match_int(&args[0], &option))
744 pconfig->uid = option;
748 if (match_int(&args[0], &option))
750 pconfig->gid = option;
754 if (match_octal(&args[0], &option))
756 pconfig->mode = option & 01777U;
760 /* memparse() will accept a K/M/G without a digit */
761 if (!isdigit(*args[0].from))
763 size = memparse(args[0].from, &rest);
766 setsize = SIZE_PERCENT;
771 /* memparse() will accept a K/M/G without a digit */
772 if (!isdigit(*args[0].from))
774 pconfig->nr_inodes = memparse(args[0].from, &rest);
779 ps = memparse(args[0].from, &rest);
780 pconfig->hstate = size_to_hstate(ps);
781 if (!pconfig->hstate) {
783 "hugetlbfs: Unsupported page size %lu MB\n",
791 printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n",
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;
806 pconfig->nr_blocks = (size >> huge_page_shift(h));
812 printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n",
818 hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
820 struct inode * inode;
821 struct dentry * root;
823 struct hugetlbfs_config config;
824 struct hugetlbfs_sb_info *sbinfo;
826 save_mount_options(sb, data);
828 config.nr_blocks = -1; /* No limit on size by default */
829 config.nr_inodes = -1; /* No limit on number of inodes by default */
830 config.uid = current_fsuid();
831 config.gid = current_fsgid();
833 config.hstate = &default_hstate;
834 ret = hugetlbfs_parse_options(data, &config);
838 sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL);
841 sb->s_fs_info = sbinfo;
842 sbinfo->hstate = config.hstate;
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;
849 sb->s_blocksize = huge_page_size(config.hstate);
850 sb->s_blocksize_bits = huge_page_shift(config.hstate);
851 sb->s_magic = HUGETLBFS_MAGIC;
852 sb->s_op = &hugetlbfs_ops;
854 inode = hugetlbfs_get_inode(sb, config.uid, config.gid,
855 S_IFDIR | config.mode, 0);
859 root = d_alloc_root(inode);
871 int hugetlb_get_quota(struct address_space *mapping, long delta)
874 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
876 if (sbinfo->free_blocks > -1) {
877 spin_lock(&sbinfo->stat_lock);
878 if (sbinfo->free_blocks - delta >= 0)
879 sbinfo->free_blocks -= delta;
882 spin_unlock(&sbinfo->stat_lock);
888 void hugetlb_put_quota(struct address_space *mapping, long delta)
890 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
892 if (sbinfo->free_blocks > -1) {
893 spin_lock(&sbinfo->stat_lock);
894 sbinfo->free_blocks += delta;
895 spin_unlock(&sbinfo->stat_lock);
899 static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type,
900 int flags, const char *dev_name, void *data)
902 return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super);
905 static struct file_system_type hugetlbfs_fs_type = {
907 .mount = hugetlbfs_mount,
908 .kill_sb = kill_litter_super,
911 static struct vfsmount *hugetlbfs_vfsmount;
913 static int can_do_hugetlb_shm(void)
915 return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group);
918 struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
919 struct user_struct **user, int creat_flags)
926 struct qstr quick_string;
929 if (!hugetlbfs_vfsmount)
930 return ERR_PTR(-ENOENT);
932 if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
933 *user = current_user();
934 if (user_shm_lock(size, *user)) {
935 printk_once(KERN_WARNING "Using mlock ulimits for SHM_HUGETLB is deprecated\n");
938 return ERR_PTR(-EPERM);
942 root = hugetlbfs_vfsmount->mnt_root;
943 quick_string.name = name;
944 quick_string.len = strlen(quick_string.name);
945 quick_string.hash = 0;
946 path.dentry = d_alloc(root, &quick_string);
950 path.mnt = mntget(hugetlbfs_vfsmount);
952 inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(),
953 current_fsgid(), S_IFREG | S_IRWXUGO, 0);
958 if (hugetlb_reserve_pages(inode, 0,
959 size >> huge_page_shift(hstate_inode(inode)), NULL,
963 d_instantiate(path.dentry, inode);
964 inode->i_size = size;
968 file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
969 &hugetlbfs_file_operations);
971 goto out_dentry; /* inode is already attached */
981 user_shm_unlock(size, *user);
984 return ERR_PTR(error);
987 static int __init init_hugetlbfs_fs(void)
990 struct vfsmount *vfsmount;
992 error = bdi_init(&hugetlbfs_backing_dev_info);
996 hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
997 sizeof(struct hugetlbfs_inode_info),
999 if (hugetlbfs_inode_cachep == NULL)
1002 error = register_filesystem(&hugetlbfs_fs_type);
1006 vfsmount = kern_mount(&hugetlbfs_fs_type);
1008 if (!IS_ERR(vfsmount)) {
1009 hugetlbfs_vfsmount = vfsmount;
1013 error = PTR_ERR(vfsmount);
1017 kmem_cache_destroy(hugetlbfs_inode_cachep);
1019 bdi_destroy(&hugetlbfs_backing_dev_info);
1023 static void __exit exit_hugetlbfs_fs(void)
1025 kmem_cache_destroy(hugetlbfs_inode_cachep);
1026 unregister_filesystem(&hugetlbfs_fs_type);
1027 bdi_destroy(&hugetlbfs_backing_dev_info);
1030 module_init(init_hugetlbfs_fs)
1031 module_exit(exit_hugetlbfs_fs)
1033 MODULE_LICENSE("GPL");