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/quotaops.h>
30 #include <linux/slab.h>
31 #include <linux/dnotify.h>
32 #include <linux/statfs.h>
33 #include <linux/security.h>
35 #include <asm/uaccess.h>
37 /* some random number */
38 #define HUGETLBFS_MAGIC 0x958458f6
40 static const struct super_operations hugetlbfs_ops;
41 static const struct address_space_operations hugetlbfs_aops;
42 const struct file_operations hugetlbfs_file_operations;
43 static const struct inode_operations hugetlbfs_dir_inode_operations;
44 static const struct inode_operations hugetlbfs_inode_operations;
46 static struct backing_dev_info hugetlbfs_backing_dev_info = {
47 .ra_pages = 0, /* No readahead */
48 .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
51 int sysctl_hugetlb_shm_group;
54 Opt_size, Opt_nr_inodes,
55 Opt_mode, Opt_uid, Opt_gid,
59 static match_table_t tokens = {
60 {Opt_size, "size=%s"},
61 {Opt_nr_inodes, "nr_inodes=%s"},
62 {Opt_mode, "mode=%o"},
68 static void huge_pagevec_release(struct pagevec *pvec)
72 for (i = 0; i < pagevec_count(pvec); ++i)
73 put_page(pvec->pages[i]);
78 static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
80 struct inode *inode = file->f_path.dentry->d_inode;
85 * vma address alignment (but not the pgoff alignment) has
86 * already been checked by prepare_hugepage_range. If you add
87 * any error returns here, do so after setting VM_HUGETLB, so
88 * is_vm_hugetlb_page tests below unmap_region go the right
89 * way when do_mmap_pgoff unwinds (may be important on powerpc
92 vma->vm_flags |= VM_HUGETLB | VM_RESERVED;
93 vma->vm_ops = &hugetlb_vm_ops;
95 if (vma->vm_pgoff & ~(HPAGE_MASK >> PAGE_SHIFT))
98 vma_len = (loff_t)(vma->vm_end - vma->vm_start);
100 mutex_lock(&inode->i_mutex);
104 len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
106 if (vma->vm_flags & VM_MAYSHARE &&
107 hugetlb_reserve_pages(inode, vma->vm_pgoff >> (HPAGE_SHIFT-PAGE_SHIFT),
112 hugetlb_prefault_arch_hook(vma->vm_mm);
113 if (vma->vm_flags & VM_WRITE && inode->i_size < len)
116 mutex_unlock(&inode->i_mutex);
122 * Called under down_write(mmap_sem).
125 #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
127 hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
128 unsigned long len, unsigned long pgoff, unsigned long flags)
130 struct mm_struct *mm = current->mm;
131 struct vm_area_struct *vma;
132 unsigned long start_addr;
134 if (len & ~HPAGE_MASK)
139 if (flags & MAP_FIXED) {
140 if (prepare_hugepage_range(addr, len))
146 addr = ALIGN(addr, HPAGE_SIZE);
147 vma = find_vma(mm, addr);
148 if (TASK_SIZE - len >= addr &&
149 (!vma || addr + len <= vma->vm_start))
153 start_addr = mm->free_area_cache;
155 if (len <= mm->cached_hole_size)
156 start_addr = TASK_UNMAPPED_BASE;
159 addr = ALIGN(start_addr, HPAGE_SIZE);
161 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
162 /* At this point: (!vma || addr < vma->vm_end). */
163 if (TASK_SIZE - len < addr) {
165 * Start a new search - just in case we missed
168 if (start_addr != TASK_UNMAPPED_BASE) {
169 start_addr = TASK_UNMAPPED_BASE;
175 if (!vma || addr + len <= vma->vm_start)
177 addr = ALIGN(vma->vm_end, HPAGE_SIZE);
183 hugetlbfs_read_actor(struct page *page, unsigned long offset,
184 char __user *buf, unsigned long count,
188 unsigned long left, copied = 0;
194 /* Find which 4k chunk and offset with in that chunk */
195 i = offset >> PAGE_CACHE_SHIFT;
196 offset = offset & ~PAGE_CACHE_MASK;
199 chunksize = PAGE_CACHE_SIZE;
202 if (chunksize > size)
204 kaddr = kmap(&page[i]);
205 left = __copy_to_user(buf, kaddr + offset, chunksize);
208 copied += (chunksize - left);
217 return copied ? copied : -EFAULT;
221 * Support for read() - Find the page attached to f_mapping and copy out the
222 * data. Its *very* similar to do_generic_mapping_read(), we can't use that
223 * since it has PAGE_CACHE_SIZE assumptions.
225 static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
226 size_t len, loff_t *ppos)
228 struct address_space *mapping = filp->f_mapping;
229 struct inode *inode = mapping->host;
230 unsigned long index = *ppos >> HPAGE_SHIFT;
231 unsigned long offset = *ppos & ~HPAGE_MASK;
232 unsigned long end_index;
236 mutex_lock(&inode->i_mutex);
238 /* validate length */
242 isize = i_size_read(inode);
246 end_index = (isize - 1) >> HPAGE_SHIFT;
251 /* nr is the maximum number of bytes to copy from this page */
253 if (index >= end_index) {
254 if (index > end_index)
256 nr = ((isize - 1) & ~HPAGE_MASK) + 1;
264 page = find_get_page(mapping, index);
265 if (unlikely(page == NULL)) {
267 * We have a HOLE, zero out the user-buffer for the
268 * length of the hole or request.
270 ret = len < nr ? len : nr;
271 if (clear_user(buf, ret))
275 * We have the page, copy it to user space buffer.
277 ret = hugetlbfs_read_actor(page, offset, buf, len, nr);
283 page_cache_release(page);
290 index += offset >> HPAGE_SHIFT;
291 offset &= ~HPAGE_MASK;
294 page_cache_release(page);
296 /* short read or no more work */
297 if ((ret != nr) || (len == 0))
301 *ppos = ((loff_t)index << HPAGE_SHIFT) + offset;
302 mutex_unlock(&inode->i_mutex);
307 * Read a page. Again trivial. If it didn't already exist
308 * in the page cache, it is zero-filled.
310 static int hugetlbfs_readpage(struct file *file, struct page * page)
316 static int hugetlbfs_write_begin(struct file *file,
317 struct address_space *mapping,
318 loff_t pos, unsigned len, unsigned flags,
319 struct page **pagep, void **fsdata)
324 static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
325 loff_t pos, unsigned len, unsigned copied,
326 struct page *page, void *fsdata)
332 static void truncate_huge_page(struct page *page)
334 cancel_dirty_page(page, /* No IO accounting for huge pages? */0);
335 ClearPageUptodate(page);
336 remove_from_page_cache(page);
340 static void truncate_hugepages(struct inode *inode, loff_t lstart)
342 struct address_space *mapping = &inode->i_data;
343 const pgoff_t start = lstart >> HPAGE_SHIFT;
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);
367 hugetlb_put_quota(mapping);
370 huge_pagevec_release(&pvec);
372 BUG_ON(!lstart && mapping->nrpages);
373 hugetlb_unreserve_pages(inode, start, freed);
376 static void hugetlbfs_delete_inode(struct inode *inode)
378 truncate_hugepages(inode, 0);
382 static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock)
384 struct super_block *sb = inode->i_sb;
386 if (!hlist_unhashed(&inode->i_hash)) {
387 if (!(inode->i_state & (I_DIRTY|I_LOCK)))
388 list_move(&inode->i_list, &inode_unused);
389 inodes_stat.nr_unused++;
390 if (!sb || (sb->s_flags & MS_ACTIVE)) {
391 spin_unlock(&inode_lock);
394 inode->i_state |= I_WILL_FREE;
395 spin_unlock(&inode_lock);
397 * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK
398 * in our backing_dev_info.
400 write_inode_now(inode, 1);
401 spin_lock(&inode_lock);
402 inode->i_state &= ~I_WILL_FREE;
403 inodes_stat.nr_unused--;
404 hlist_del_init(&inode->i_hash);
406 list_del_init(&inode->i_list);
407 list_del_init(&inode->i_sb_list);
408 inode->i_state |= I_FREEING;
409 inodes_stat.nr_inodes--;
410 spin_unlock(&inode_lock);
411 truncate_hugepages(inode, 0);
413 destroy_inode(inode);
416 static void hugetlbfs_drop_inode(struct inode *inode)
419 generic_delete_inode(inode);
421 hugetlbfs_forget_inode(inode);
425 hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff)
427 struct vm_area_struct *vma;
428 struct prio_tree_iter iter;
430 vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) {
431 unsigned long v_offset;
434 * Can the expression below overflow on 32-bit arches?
435 * No, because the prio_tree returns us only those vmas
436 * which overlap the truncated area starting at pgoff,
437 * and no vma on a 32-bit arch can span beyond the 4GB.
439 if (vma->vm_pgoff < pgoff)
440 v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT;
444 __unmap_hugepage_range(vma,
445 vma->vm_start + v_offset, vma->vm_end);
449 static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
452 struct address_space *mapping = inode->i_mapping;
454 BUG_ON(offset & ~HPAGE_MASK);
455 pgoff = offset >> PAGE_SHIFT;
457 i_size_write(inode, offset);
458 spin_lock(&mapping->i_mmap_lock);
459 if (!prio_tree_empty(&mapping->i_mmap))
460 hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
461 spin_unlock(&mapping->i_mmap_lock);
462 truncate_hugepages(inode, offset);
466 static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
468 struct inode *inode = dentry->d_inode;
470 unsigned int ia_valid = attr->ia_valid;
474 error = inode_change_ok(inode, attr);
478 if (ia_valid & ATTR_SIZE) {
480 if (!(attr->ia_size & ~HPAGE_MASK))
481 error = hugetlb_vmtruncate(inode, attr->ia_size);
484 attr->ia_valid &= ~ATTR_SIZE;
486 error = inode_setattr(inode, attr);
491 static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
492 gid_t gid, int mode, dev_t dev)
496 inode = new_inode(sb);
498 struct hugetlbfs_inode_info *info;
499 inode->i_mode = mode;
503 inode->i_mapping->a_ops = &hugetlbfs_aops;
504 inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
505 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
506 INIT_LIST_HEAD(&inode->i_mapping->private_list);
507 info = HUGETLBFS_I(inode);
508 mpol_shared_policy_init(&info->policy, MPOL_DEFAULT, NULL);
509 switch (mode & S_IFMT) {
511 init_special_inode(inode, mode, dev);
514 inode->i_op = &hugetlbfs_inode_operations;
515 inode->i_fop = &hugetlbfs_file_operations;
518 inode->i_op = &hugetlbfs_dir_inode_operations;
519 inode->i_fop = &simple_dir_operations;
521 /* directory inodes start off with i_nlink == 2 (for "." entry) */
525 inode->i_op = &page_symlink_inode_operations;
533 * File creation. Allocate an inode, and we're done..
535 static int hugetlbfs_mknod(struct inode *dir,
536 struct dentry *dentry, int mode, dev_t dev)
542 if (dir->i_mode & S_ISGID) {
547 gid = current->fsgid;
549 inode = hugetlbfs_get_inode(dir->i_sb, current->fsuid, gid, mode, dev);
551 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
552 d_instantiate(dentry, inode);
553 dget(dentry); /* Extra count - pin the dentry in core */
559 static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
561 int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0);
567 static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
569 return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0);
572 static int hugetlbfs_symlink(struct inode *dir,
573 struct dentry *dentry, const char *symname)
579 if (dir->i_mode & S_ISGID)
582 gid = current->fsgid;
584 inode = hugetlbfs_get_inode(dir->i_sb, current->fsuid,
585 gid, S_IFLNK|S_IRWXUGO, 0);
587 int l = strlen(symname)+1;
588 error = page_symlink(inode, symname, l);
590 d_instantiate(dentry, inode);
595 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
601 * mark the head page dirty
603 static int hugetlbfs_set_page_dirty(struct page *page)
605 struct page *head = compound_head(page);
611 static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
613 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb);
615 buf->f_type = HUGETLBFS_MAGIC;
616 buf->f_bsize = HPAGE_SIZE;
618 spin_lock(&sbinfo->stat_lock);
619 /* If no limits set, just report 0 for max/free/used
620 * blocks, like simple_statfs() */
621 if (sbinfo->max_blocks >= 0) {
622 buf->f_blocks = sbinfo->max_blocks;
623 buf->f_bavail = buf->f_bfree = sbinfo->free_blocks;
624 buf->f_files = sbinfo->max_inodes;
625 buf->f_ffree = sbinfo->free_inodes;
627 spin_unlock(&sbinfo->stat_lock);
629 buf->f_namelen = NAME_MAX;
633 static void hugetlbfs_put_super(struct super_block *sb)
635 struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb);
638 sb->s_fs_info = NULL;
643 static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo)
645 if (sbinfo->free_inodes >= 0) {
646 spin_lock(&sbinfo->stat_lock);
647 if (unlikely(!sbinfo->free_inodes)) {
648 spin_unlock(&sbinfo->stat_lock);
651 sbinfo->free_inodes--;
652 spin_unlock(&sbinfo->stat_lock);
658 static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo)
660 if (sbinfo->free_inodes >= 0) {
661 spin_lock(&sbinfo->stat_lock);
662 sbinfo->free_inodes++;
663 spin_unlock(&sbinfo->stat_lock);
668 static struct kmem_cache *hugetlbfs_inode_cachep;
670 static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
672 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
673 struct hugetlbfs_inode_info *p;
675 if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo)))
677 p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL);
679 hugetlbfs_inc_free_inodes(sbinfo);
682 return &p->vfs_inode;
685 static void hugetlbfs_destroy_inode(struct inode *inode)
687 hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb));
688 mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy);
689 kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
692 static const struct address_space_operations hugetlbfs_aops = {
693 .readpage = hugetlbfs_readpage,
694 .write_begin = hugetlbfs_write_begin,
695 .write_end = hugetlbfs_write_end,
696 .set_page_dirty = hugetlbfs_set_page_dirty,
700 static void init_once(struct kmem_cache *cachep, void *foo)
702 struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
704 inode_init_once(&ei->vfs_inode);
707 const struct file_operations hugetlbfs_file_operations = {
708 .read = hugetlbfs_read,
709 .mmap = hugetlbfs_file_mmap,
710 .fsync = simple_sync_file,
711 .get_unmapped_area = hugetlb_get_unmapped_area,
714 static const struct inode_operations hugetlbfs_dir_inode_operations = {
715 .create = hugetlbfs_create,
716 .lookup = simple_lookup,
718 .unlink = simple_unlink,
719 .symlink = hugetlbfs_symlink,
720 .mkdir = hugetlbfs_mkdir,
721 .rmdir = simple_rmdir,
722 .mknod = hugetlbfs_mknod,
723 .rename = simple_rename,
724 .setattr = hugetlbfs_setattr,
727 static const struct inode_operations hugetlbfs_inode_operations = {
728 .setattr = hugetlbfs_setattr,
731 static const struct super_operations hugetlbfs_ops = {
732 .alloc_inode = hugetlbfs_alloc_inode,
733 .destroy_inode = hugetlbfs_destroy_inode,
734 .statfs = hugetlbfs_statfs,
735 .delete_inode = hugetlbfs_delete_inode,
736 .drop_inode = hugetlbfs_drop_inode,
737 .put_super = hugetlbfs_put_super,
741 hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
744 substring_t args[MAX_OPT_ARGS];
750 while ((p = strsep(&options, ",")) != NULL) {
755 token = match_token(p, tokens, args);
758 if (match_int(&args[0], &option))
760 pconfig->uid = option;
764 if (match_int(&args[0], &option))
766 pconfig->gid = option;
770 if (match_octal(&args[0], &option))
772 pconfig->mode = option & 0777U;
776 unsigned long long size;
777 /* memparse() will accept a K/M/G without a digit */
778 if (!isdigit(*args[0].from))
780 size = memparse(args[0].from, &rest);
782 size <<= HPAGE_SHIFT;
783 size *= max_huge_pages;
786 pconfig->nr_blocks = (size >> HPAGE_SHIFT);
791 /* memparse() will accept a K/M/G without a digit */
792 if (!isdigit(*args[0].from))
794 pconfig->nr_inodes = memparse(args[0].from, &rest);
798 printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n",
807 printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n",
813 hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
815 struct inode * inode;
816 struct dentry * root;
818 struct hugetlbfs_config config;
819 struct hugetlbfs_sb_info *sbinfo;
821 config.nr_blocks = -1; /* No limit on size by default */
822 config.nr_inodes = -1; /* No limit on number of inodes by default */
823 config.uid = current->fsuid;
824 config.gid = current->fsgid;
826 ret = hugetlbfs_parse_options(data, &config);
830 sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL);
833 sb->s_fs_info = sbinfo;
834 spin_lock_init(&sbinfo->stat_lock);
835 sbinfo->max_blocks = config.nr_blocks;
836 sbinfo->free_blocks = config.nr_blocks;
837 sbinfo->max_inodes = config.nr_inodes;
838 sbinfo->free_inodes = config.nr_inodes;
839 sb->s_maxbytes = MAX_LFS_FILESIZE;
840 sb->s_blocksize = HPAGE_SIZE;
841 sb->s_blocksize_bits = HPAGE_SHIFT;
842 sb->s_magic = HUGETLBFS_MAGIC;
843 sb->s_op = &hugetlbfs_ops;
845 inode = hugetlbfs_get_inode(sb, config.uid, config.gid,
846 S_IFDIR | config.mode, 0);
850 root = d_alloc_root(inode);
862 int hugetlb_get_quota(struct address_space *mapping)
865 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
867 if (sbinfo->free_blocks > -1) {
868 spin_lock(&sbinfo->stat_lock);
869 if (sbinfo->free_blocks > 0)
870 sbinfo->free_blocks--;
873 spin_unlock(&sbinfo->stat_lock);
879 void hugetlb_put_quota(struct address_space *mapping)
881 struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb);
883 if (sbinfo->free_blocks > -1) {
884 spin_lock(&sbinfo->stat_lock);
885 sbinfo->free_blocks++;
886 spin_unlock(&sbinfo->stat_lock);
890 static int hugetlbfs_get_sb(struct file_system_type *fs_type,
891 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
893 return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt);
896 static struct file_system_type hugetlbfs_fs_type = {
898 .get_sb = hugetlbfs_get_sb,
899 .kill_sb = kill_litter_super,
902 static struct vfsmount *hugetlbfs_vfsmount;
904 static int can_do_hugetlb_shm(void)
906 return likely(capable(CAP_IPC_LOCK) ||
907 in_group_p(sysctl_hugetlb_shm_group) ||
911 struct file *hugetlb_file_setup(const char *name, size_t size)
916 struct dentry *dentry, *root;
917 struct qstr quick_string;
919 if (!hugetlbfs_vfsmount)
920 return ERR_PTR(-ENOENT);
922 if (!can_do_hugetlb_shm())
923 return ERR_PTR(-EPERM);
925 if (!user_shm_lock(size, current->user))
926 return ERR_PTR(-ENOMEM);
928 root = hugetlbfs_vfsmount->mnt_root;
929 quick_string.name = name;
930 quick_string.len = strlen(quick_string.name);
931 quick_string.hash = 0;
932 dentry = d_alloc(root, &quick_string);
937 file = get_empty_filp();
942 inode = hugetlbfs_get_inode(root->d_sb, current->fsuid,
943 current->fsgid, S_IFREG | S_IRWXUGO, 0);
948 if (hugetlb_reserve_pages(inode, 0, size >> HPAGE_SHIFT))
951 d_instantiate(dentry, inode);
952 inode->i_size = size;
954 file->f_path.mnt = mntget(hugetlbfs_vfsmount);
955 file->f_path.dentry = dentry;
956 file->f_mapping = inode->i_mapping;
957 file->f_op = &hugetlbfs_file_operations;
958 file->f_mode = FMODE_WRITE | FMODE_READ;
968 user_shm_unlock(size, current->user);
969 return ERR_PTR(error);
972 static int __init init_hugetlbfs_fs(void)
975 struct vfsmount *vfsmount;
977 error = bdi_init(&hugetlbfs_backing_dev_info);
981 hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
982 sizeof(struct hugetlbfs_inode_info),
984 if (hugetlbfs_inode_cachep == NULL)
987 error = register_filesystem(&hugetlbfs_fs_type);
991 vfsmount = kern_mount(&hugetlbfs_fs_type);
993 if (!IS_ERR(vfsmount)) {
994 hugetlbfs_vfsmount = vfsmount;
998 error = PTR_ERR(vfsmount);
1002 kmem_cache_destroy(hugetlbfs_inode_cachep);
1004 bdi_destroy(&hugetlbfs_backing_dev_info);
1008 static void __exit exit_hugetlbfs_fs(void)
1010 kmem_cache_destroy(hugetlbfs_inode_cachep);
1011 unregister_filesystem(&hugetlbfs_fs_type);
1012 bdi_destroy(&hugetlbfs_backing_dev_info);
1015 module_init(init_hugetlbfs_fs)
1016 module_exit(exit_hugetlbfs_fs)
1018 MODULE_LICENSE("GPL");