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![Aneesh Kumar K.V](/assets/img/avatar_default.png)
Use a mmu_gather instead of a temporary linked list for accumulating pages when we unmap a hugepage range Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1054 lines
25 KiB
C
1054 lines
25 KiB
C
/*
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* hugetlbpage-backed filesystem. Based on ramfs.
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*
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* William Irwin, 2002
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*
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* Copyright (C) 2002 Linus Torvalds.
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*/
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#include <linux/module.h>
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#include <linux/thread_info.h>
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#include <asm/current.h>
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#include <linux/sched.h> /* remove ASAP */
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/file.h>
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#include <linux/kernel.h>
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#include <linux/writeback.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/capability.h>
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#include <linux/ctype.h>
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#include <linux/backing-dev.h>
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#include <linux/hugetlb.h>
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#include <linux/pagevec.h>
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#include <linux/parser.h>
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#include <linux/mman.h>
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#include <linux/slab.h>
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#include <linux/dnotify.h>
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#include <linux/statfs.h>
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#include <linux/security.h>
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#include <linux/magic.h>
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#include <linux/migrate.h>
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#include <asm/uaccess.h>
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static const struct super_operations hugetlbfs_ops;
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static const struct address_space_operations hugetlbfs_aops;
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const struct file_operations hugetlbfs_file_operations;
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static const struct inode_operations hugetlbfs_dir_inode_operations;
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static const struct inode_operations hugetlbfs_inode_operations;
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struct hugetlbfs_config {
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uid_t uid;
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gid_t gid;
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umode_t mode;
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long nr_blocks;
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long nr_inodes;
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struct hstate *hstate;
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};
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struct hugetlbfs_inode_info {
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struct shared_policy policy;
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struct inode vfs_inode;
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};
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static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
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{
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return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
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}
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static struct backing_dev_info hugetlbfs_backing_dev_info = {
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.name = "hugetlbfs",
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.ra_pages = 0, /* No readahead */
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.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
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};
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int sysctl_hugetlb_shm_group;
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enum {
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Opt_size, Opt_nr_inodes,
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Opt_mode, Opt_uid, Opt_gid,
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Opt_pagesize,
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Opt_err,
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};
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static const match_table_t tokens = {
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{Opt_size, "size=%s"},
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{Opt_nr_inodes, "nr_inodes=%s"},
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{Opt_mode, "mode=%o"},
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_pagesize, "pagesize=%s"},
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{Opt_err, NULL},
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};
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static void huge_pagevec_release(struct pagevec *pvec)
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{
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int i;
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for (i = 0; i < pagevec_count(pvec); ++i)
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put_page(pvec->pages[i]);
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pagevec_reinit(pvec);
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}
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static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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loff_t len, vma_len;
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int ret;
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struct hstate *h = hstate_file(file);
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/*
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* vma address alignment (but not the pgoff alignment) has
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* already been checked by prepare_hugepage_range. If you add
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* any error returns here, do so after setting VM_HUGETLB, so
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* is_vm_hugetlb_page tests below unmap_region go the right
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* way when do_mmap_pgoff unwinds (may be important on powerpc
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* and ia64).
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*/
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vma->vm_flags |= VM_HUGETLB | VM_RESERVED;
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vma->vm_ops = &hugetlb_vm_ops;
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if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT))
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return -EINVAL;
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vma_len = (loff_t)(vma->vm_end - vma->vm_start);
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mutex_lock(&inode->i_mutex);
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file_accessed(file);
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ret = -ENOMEM;
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len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
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if (hugetlb_reserve_pages(inode,
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vma->vm_pgoff >> huge_page_order(h),
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len >> huge_page_shift(h), vma,
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vma->vm_flags))
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goto out;
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ret = 0;
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hugetlb_prefault_arch_hook(vma->vm_mm);
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if (vma->vm_flags & VM_WRITE && inode->i_size < len)
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inode->i_size = len;
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out:
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mutex_unlock(&inode->i_mutex);
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return ret;
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}
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/*
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* Called under down_write(mmap_sem).
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*/
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#ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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static unsigned long
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hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long start_addr;
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struct hstate *h = hstate_file(file);
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (len > TASK_SIZE)
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return -ENOMEM;
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if (flags & MAP_FIXED) {
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if (prepare_hugepage_range(file, addr, len))
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return -EINVAL;
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return addr;
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}
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if (addr) {
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addr = ALIGN(addr, huge_page_size(h));
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vma = find_vma(mm, addr);
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if (TASK_SIZE - len >= addr &&
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(!vma || addr + len <= vma->vm_start))
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return addr;
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}
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if (len > mm->cached_hole_size)
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start_addr = mm->free_area_cache;
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else {
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start_addr = TASK_UNMAPPED_BASE;
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mm->cached_hole_size = 0;
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}
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full_search:
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addr = ALIGN(start_addr, huge_page_size(h));
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for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
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/* At this point: (!vma || addr < vma->vm_end). */
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if (TASK_SIZE - len < addr) {
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/*
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* Start a new search - just in case we missed
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* some holes.
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*/
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if (start_addr != TASK_UNMAPPED_BASE) {
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start_addr = TASK_UNMAPPED_BASE;
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mm->cached_hole_size = 0;
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goto full_search;
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}
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return -ENOMEM;
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}
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if (!vma || addr + len <= vma->vm_start) {
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mm->free_area_cache = addr + len;
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return addr;
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}
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if (addr + mm->cached_hole_size < vma->vm_start)
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mm->cached_hole_size = vma->vm_start - addr;
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addr = ALIGN(vma->vm_end, huge_page_size(h));
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}
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}
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#endif
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static int
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hugetlbfs_read_actor(struct page *page, unsigned long offset,
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char __user *buf, unsigned long count,
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unsigned long size)
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{
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char *kaddr;
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unsigned long left, copied = 0;
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int i, chunksize;
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if (size > count)
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size = count;
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/* Find which 4k chunk and offset with in that chunk */
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i = offset >> PAGE_CACHE_SHIFT;
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offset = offset & ~PAGE_CACHE_MASK;
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while (size) {
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chunksize = PAGE_CACHE_SIZE;
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if (offset)
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chunksize -= offset;
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if (chunksize > size)
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chunksize = size;
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kaddr = kmap(&page[i]);
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left = __copy_to_user(buf, kaddr + offset, chunksize);
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kunmap(&page[i]);
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if (left) {
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copied += (chunksize - left);
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break;
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}
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offset = 0;
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size -= chunksize;
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buf += chunksize;
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copied += chunksize;
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i++;
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}
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return copied ? copied : -EFAULT;
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}
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/*
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* Support for read() - Find the page attached to f_mapping and copy out the
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* data. Its *very* similar to do_generic_mapping_read(), we can't use that
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* since it has PAGE_CACHE_SIZE assumptions.
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*/
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static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct hstate *h = hstate_file(filp);
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struct address_space *mapping = filp->f_mapping;
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struct inode *inode = mapping->host;
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unsigned long index = *ppos >> huge_page_shift(h);
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unsigned long offset = *ppos & ~huge_page_mask(h);
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unsigned long end_index;
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loff_t isize;
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ssize_t retval = 0;
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/* validate length */
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if (len == 0)
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goto out;
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for (;;) {
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struct page *page;
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unsigned long nr, ret;
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int ra;
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/* nr is the maximum number of bytes to copy from this page */
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nr = huge_page_size(h);
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isize = i_size_read(inode);
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if (!isize)
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goto out;
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end_index = (isize - 1) >> huge_page_shift(h);
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if (index >= end_index) {
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if (index > end_index)
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goto out;
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nr = ((isize - 1) & ~huge_page_mask(h)) + 1;
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if (nr <= offset)
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goto out;
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}
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nr = nr - offset;
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/* Find the page */
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page = find_lock_page(mapping, index);
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if (unlikely(page == NULL)) {
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/*
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* We have a HOLE, zero out the user-buffer for the
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* length of the hole or request.
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*/
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ret = len < nr ? len : nr;
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if (clear_user(buf, ret))
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ra = -EFAULT;
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else
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ra = 0;
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} else {
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unlock_page(page);
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/*
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* We have the page, copy it to user space buffer.
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*/
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ra = hugetlbfs_read_actor(page, offset, buf, len, nr);
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ret = ra;
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page_cache_release(page);
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}
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if (ra < 0) {
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if (retval == 0)
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retval = ra;
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goto out;
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}
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offset += ret;
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retval += ret;
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len -= ret;
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index += offset >> huge_page_shift(h);
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offset &= ~huge_page_mask(h);
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/* short read or no more work */
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if ((ret != nr) || (len == 0))
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break;
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}
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out:
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*ppos = ((loff_t)index << huge_page_shift(h)) + offset;
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return retval;
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}
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static int hugetlbfs_write_begin(struct file *file,
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struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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return -EINVAL;
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}
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static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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BUG();
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return -EINVAL;
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}
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static void truncate_huge_page(struct page *page)
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{
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cancel_dirty_page(page, /* No IO accounting for huge pages? */0);
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ClearPageUptodate(page);
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delete_from_page_cache(page);
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}
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static void truncate_hugepages(struct inode *inode, loff_t lstart)
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{
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struct hstate *h = hstate_inode(inode);
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struct address_space *mapping = &inode->i_data;
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const pgoff_t start = lstart >> huge_page_shift(h);
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struct pagevec pvec;
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pgoff_t next;
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int i, freed = 0;
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pagevec_init(&pvec, 0);
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next = start;
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while (1) {
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if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
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if (next == start)
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break;
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next = start;
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continue;
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}
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for (i = 0; i < pagevec_count(&pvec); ++i) {
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struct page *page = pvec.pages[i];
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lock_page(page);
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if (page->index > next)
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next = page->index;
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++next;
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truncate_huge_page(page);
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unlock_page(page);
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freed++;
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}
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huge_pagevec_release(&pvec);
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}
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BUG_ON(!lstart && mapping->nrpages);
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hugetlb_unreserve_pages(inode, start, freed);
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}
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static void hugetlbfs_evict_inode(struct inode *inode)
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{
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truncate_hugepages(inode, 0);
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clear_inode(inode);
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}
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static inline void
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hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff)
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{
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struct vm_area_struct *vma;
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struct prio_tree_iter iter;
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vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) {
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unsigned long v_offset;
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|
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/*
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* Can the expression below overflow on 32-bit arches?
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* No, because the prio_tree returns us only those vmas
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* which overlap the truncated area starting at pgoff,
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* and no vma on a 32-bit arch can span beyond the 4GB.
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*/
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if (vma->vm_pgoff < pgoff)
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v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT;
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else
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v_offset = 0;
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unmap_hugepage_range(vma, vma->vm_start + v_offset,
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vma->vm_end, NULL);
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}
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}
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|
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static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
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{
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pgoff_t pgoff;
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struct address_space *mapping = inode->i_mapping;
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struct hstate *h = hstate_inode(inode);
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BUG_ON(offset & ~huge_page_mask(h));
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pgoff = offset >> PAGE_SHIFT;
|
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|
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i_size_write(inode, offset);
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mutex_lock(&mapping->i_mmap_mutex);
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if (!prio_tree_empty(&mapping->i_mmap))
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hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
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mutex_unlock(&mapping->i_mmap_mutex);
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truncate_hugepages(inode, offset);
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return 0;
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}
|
|
|
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static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = dentry->d_inode;
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struct hstate *h = hstate_inode(inode);
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int error;
|
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unsigned int ia_valid = attr->ia_valid;
|
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|
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BUG_ON(!inode);
|
|
|
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error = inode_change_ok(inode, attr);
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if (error)
|
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return error;
|
|
|
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if (ia_valid & ATTR_SIZE) {
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error = -EINVAL;
|
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if (attr->ia_size & ~huge_page_mask(h))
|
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return -EINVAL;
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error = hugetlb_vmtruncate(inode, attr->ia_size);
|
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if (error)
|
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return error;
|
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}
|
|
|
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setattr_copy(inode, attr);
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mark_inode_dirty(inode);
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return 0;
|
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}
|
|
|
|
static struct inode *hugetlbfs_get_root(struct super_block *sb,
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struct hugetlbfs_config *config)
|
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{
|
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struct inode *inode;
|
|
|
|
inode = new_inode(sb);
|
|
if (inode) {
|
|
struct hugetlbfs_inode_info *info;
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mode = S_IFDIR | config->mode;
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inode->i_uid = config->uid;
|
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inode->i_gid = config->gid;
|
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
info = HUGETLBFS_I(inode);
|
|
mpol_shared_policy_init(&info->policy, NULL);
|
|
inode->i_op = &hugetlbfs_dir_inode_operations;
|
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inode->i_fop = &simple_dir_operations;
|
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/* directory inodes start off with i_nlink == 2 (for "." entry) */
|
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inc_nlink(inode);
|
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lockdep_annotate_inode_mutex_key(inode);
|
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}
|
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return inode;
|
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}
|
|
|
|
static struct inode *hugetlbfs_get_inode(struct super_block *sb,
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struct inode *dir,
|
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umode_t mode, dev_t dev)
|
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{
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struct inode *inode;
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|
|
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inode = new_inode(sb);
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|
if (inode) {
|
|
struct hugetlbfs_inode_info *info;
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inode->i_ino = get_next_ino();
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inode_init_owner(inode, dir, mode);
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inode->i_mapping->a_ops = &hugetlbfs_aops;
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|
inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
|
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
INIT_LIST_HEAD(&inode->i_mapping->private_list);
|
|
info = HUGETLBFS_I(inode);
|
|
/*
|
|
* The policy is initialized here even if we are creating a
|
|
* private inode because initialization simply creates an
|
|
* an empty rb tree and calls spin_lock_init(), later when we
|
|
* call mpol_free_shared_policy() it will just return because
|
|
* the rb tree will still be empty.
|
|
*/
|
|
mpol_shared_policy_init(&info->policy, NULL);
|
|
switch (mode & S_IFMT) {
|
|
default:
|
|
init_special_inode(inode, mode, dev);
|
|
break;
|
|
case S_IFREG:
|
|
inode->i_op = &hugetlbfs_inode_operations;
|
|
inode->i_fop = &hugetlbfs_file_operations;
|
|
break;
|
|
case S_IFDIR:
|
|
inode->i_op = &hugetlbfs_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
|
|
/* directory inodes start off with i_nlink == 2 (for "." entry) */
|
|
inc_nlink(inode);
|
|
break;
|
|
case S_IFLNK:
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
break;
|
|
}
|
|
lockdep_annotate_inode_mutex_key(inode);
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* File creation. Allocate an inode, and we're done..
|
|
*/
|
|
static int hugetlbfs_mknod(struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, dev_t dev)
|
|
{
|
|
struct inode *inode;
|
|
int error = -ENOSPC;
|
|
|
|
inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev);
|
|
if (inode) {
|
|
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
|
|
d_instantiate(dentry, inode);
|
|
dget(dentry); /* Extra count - pin the dentry in core */
|
|
error = 0;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0);
|
|
if (!retval)
|
|
inc_nlink(dir);
|
|
return retval;
|
|
}
|
|
|
|
static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
|
|
{
|
|
return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0);
|
|
}
|
|
|
|
static int hugetlbfs_symlink(struct inode *dir,
|
|
struct dentry *dentry, const char *symname)
|
|
{
|
|
struct inode *inode;
|
|
int error = -ENOSPC;
|
|
|
|
inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0);
|
|
if (inode) {
|
|
int l = strlen(symname)+1;
|
|
error = page_symlink(inode, symname, l);
|
|
if (!error) {
|
|
d_instantiate(dentry, inode);
|
|
dget(dentry);
|
|
} else
|
|
iput(inode);
|
|
}
|
|
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* mark the head page dirty
|
|
*/
|
|
static int hugetlbfs_set_page_dirty(struct page *page)
|
|
{
|
|
struct page *head = compound_head(page);
|
|
|
|
SetPageDirty(head);
|
|
return 0;
|
|
}
|
|
|
|
static int hugetlbfs_migrate_page(struct address_space *mapping,
|
|
struct page *newpage, struct page *page,
|
|
enum migrate_mode mode)
|
|
{
|
|
int rc;
|
|
|
|
rc = migrate_huge_page_move_mapping(mapping, newpage, page);
|
|
if (rc)
|
|
return rc;
|
|
migrate_page_copy(newpage, page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb);
|
|
struct hstate *h = hstate_inode(dentry->d_inode);
|
|
|
|
buf->f_type = HUGETLBFS_MAGIC;
|
|
buf->f_bsize = huge_page_size(h);
|
|
if (sbinfo) {
|
|
spin_lock(&sbinfo->stat_lock);
|
|
/* If no limits set, just report 0 for max/free/used
|
|
* blocks, like simple_statfs() */
|
|
if (sbinfo->spool) {
|
|
long free_pages;
|
|
|
|
spin_lock(&sbinfo->spool->lock);
|
|
buf->f_blocks = sbinfo->spool->max_hpages;
|
|
free_pages = sbinfo->spool->max_hpages
|
|
- sbinfo->spool->used_hpages;
|
|
buf->f_bavail = buf->f_bfree = free_pages;
|
|
spin_unlock(&sbinfo->spool->lock);
|
|
buf->f_files = sbinfo->max_inodes;
|
|
buf->f_ffree = sbinfo->free_inodes;
|
|
}
|
|
spin_unlock(&sbinfo->stat_lock);
|
|
}
|
|
buf->f_namelen = NAME_MAX;
|
|
return 0;
|
|
}
|
|
|
|
static void hugetlbfs_put_super(struct super_block *sb)
|
|
{
|
|
struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb);
|
|
|
|
if (sbi) {
|
|
sb->s_fs_info = NULL;
|
|
|
|
if (sbi->spool)
|
|
hugepage_put_subpool(sbi->spool);
|
|
|
|
kfree(sbi);
|
|
}
|
|
}
|
|
|
|
static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo)
|
|
{
|
|
if (sbinfo->free_inodes >= 0) {
|
|
spin_lock(&sbinfo->stat_lock);
|
|
if (unlikely(!sbinfo->free_inodes)) {
|
|
spin_unlock(&sbinfo->stat_lock);
|
|
return 0;
|
|
}
|
|
sbinfo->free_inodes--;
|
|
spin_unlock(&sbinfo->stat_lock);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo)
|
|
{
|
|
if (sbinfo->free_inodes >= 0) {
|
|
spin_lock(&sbinfo->stat_lock);
|
|
sbinfo->free_inodes++;
|
|
spin_unlock(&sbinfo->stat_lock);
|
|
}
|
|
}
|
|
|
|
|
|
static struct kmem_cache *hugetlbfs_inode_cachep;
|
|
|
|
static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
|
|
struct hugetlbfs_inode_info *p;
|
|
|
|
if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo)))
|
|
return NULL;
|
|
p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL);
|
|
if (unlikely(!p)) {
|
|
hugetlbfs_inc_free_inodes(sbinfo);
|
|
return NULL;
|
|
}
|
|
return &p->vfs_inode;
|
|
}
|
|
|
|
static void hugetlbfs_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
|
|
}
|
|
|
|
static void hugetlbfs_destroy_inode(struct inode *inode)
|
|
{
|
|
hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb));
|
|
mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy);
|
|
call_rcu(&inode->i_rcu, hugetlbfs_i_callback);
|
|
}
|
|
|
|
static const struct address_space_operations hugetlbfs_aops = {
|
|
.write_begin = hugetlbfs_write_begin,
|
|
.write_end = hugetlbfs_write_end,
|
|
.set_page_dirty = hugetlbfs_set_page_dirty,
|
|
.migratepage = hugetlbfs_migrate_page,
|
|
};
|
|
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
|
|
|
|
inode_init_once(&ei->vfs_inode);
|
|
}
|
|
|
|
const struct file_operations hugetlbfs_file_operations = {
|
|
.read = hugetlbfs_read,
|
|
.mmap = hugetlbfs_file_mmap,
|
|
.fsync = noop_fsync,
|
|
.get_unmapped_area = hugetlb_get_unmapped_area,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static const struct inode_operations hugetlbfs_dir_inode_operations = {
|
|
.create = hugetlbfs_create,
|
|
.lookup = simple_lookup,
|
|
.link = simple_link,
|
|
.unlink = simple_unlink,
|
|
.symlink = hugetlbfs_symlink,
|
|
.mkdir = hugetlbfs_mkdir,
|
|
.rmdir = simple_rmdir,
|
|
.mknod = hugetlbfs_mknod,
|
|
.rename = simple_rename,
|
|
.setattr = hugetlbfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations hugetlbfs_inode_operations = {
|
|
.setattr = hugetlbfs_setattr,
|
|
};
|
|
|
|
static const struct super_operations hugetlbfs_ops = {
|
|
.alloc_inode = hugetlbfs_alloc_inode,
|
|
.destroy_inode = hugetlbfs_destroy_inode,
|
|
.evict_inode = hugetlbfs_evict_inode,
|
|
.statfs = hugetlbfs_statfs,
|
|
.put_super = hugetlbfs_put_super,
|
|
.show_options = generic_show_options,
|
|
};
|
|
|
|
static int
|
|
hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
|
|
{
|
|
char *p, *rest;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
unsigned long long size = 0;
|
|
enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE;
|
|
|
|
if (!options)
|
|
return 0;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_uid:
|
|
if (match_int(&args[0], &option))
|
|
goto bad_val;
|
|
pconfig->uid = option;
|
|
break;
|
|
|
|
case Opt_gid:
|
|
if (match_int(&args[0], &option))
|
|
goto bad_val;
|
|
pconfig->gid = option;
|
|
break;
|
|
|
|
case Opt_mode:
|
|
if (match_octal(&args[0], &option))
|
|
goto bad_val;
|
|
pconfig->mode = option & 01777U;
|
|
break;
|
|
|
|
case Opt_size: {
|
|
/* memparse() will accept a K/M/G without a digit */
|
|
if (!isdigit(*args[0].from))
|
|
goto bad_val;
|
|
size = memparse(args[0].from, &rest);
|
|
setsize = SIZE_STD;
|
|
if (*rest == '%')
|
|
setsize = SIZE_PERCENT;
|
|
break;
|
|
}
|
|
|
|
case Opt_nr_inodes:
|
|
/* memparse() will accept a K/M/G without a digit */
|
|
if (!isdigit(*args[0].from))
|
|
goto bad_val;
|
|
pconfig->nr_inodes = memparse(args[0].from, &rest);
|
|
break;
|
|
|
|
case Opt_pagesize: {
|
|
unsigned long ps;
|
|
ps = memparse(args[0].from, &rest);
|
|
pconfig->hstate = size_to_hstate(ps);
|
|
if (!pconfig->hstate) {
|
|
printk(KERN_ERR
|
|
"hugetlbfs: Unsupported page size %lu MB\n",
|
|
ps >> 20);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n",
|
|
p);
|
|
return -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Do size after hstate is set up */
|
|
if (setsize > NO_SIZE) {
|
|
struct hstate *h = pconfig->hstate;
|
|
if (setsize == SIZE_PERCENT) {
|
|
size <<= huge_page_shift(h);
|
|
size *= h->max_huge_pages;
|
|
do_div(size, 100);
|
|
}
|
|
pconfig->nr_blocks = (size >> huge_page_shift(h));
|
|
}
|
|
|
|
return 0;
|
|
|
|
bad_val:
|
|
printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n",
|
|
args[0].from, p);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int
|
|
hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
int ret;
|
|
struct hugetlbfs_config config;
|
|
struct hugetlbfs_sb_info *sbinfo;
|
|
|
|
save_mount_options(sb, data);
|
|
|
|
config.nr_blocks = -1; /* No limit on size by default */
|
|
config.nr_inodes = -1; /* No limit on number of inodes by default */
|
|
config.uid = current_fsuid();
|
|
config.gid = current_fsgid();
|
|
config.mode = 0755;
|
|
config.hstate = &default_hstate;
|
|
ret = hugetlbfs_parse_options(data, &config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL);
|
|
if (!sbinfo)
|
|
return -ENOMEM;
|
|
sb->s_fs_info = sbinfo;
|
|
sbinfo->hstate = config.hstate;
|
|
spin_lock_init(&sbinfo->stat_lock);
|
|
sbinfo->max_inodes = config.nr_inodes;
|
|
sbinfo->free_inodes = config.nr_inodes;
|
|
sbinfo->spool = NULL;
|
|
if (config.nr_blocks != -1) {
|
|
sbinfo->spool = hugepage_new_subpool(config.nr_blocks);
|
|
if (!sbinfo->spool)
|
|
goto out_free;
|
|
}
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_blocksize = huge_page_size(config.hstate);
|
|
sb->s_blocksize_bits = huge_page_shift(config.hstate);
|
|
sb->s_magic = HUGETLBFS_MAGIC;
|
|
sb->s_op = &hugetlbfs_ops;
|
|
sb->s_time_gran = 1;
|
|
sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config));
|
|
if (!sb->s_root)
|
|
goto out_free;
|
|
return 0;
|
|
out_free:
|
|
if (sbinfo->spool)
|
|
kfree(sbinfo->spool);
|
|
kfree(sbinfo);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type hugetlbfs_fs_type = {
|
|
.name = "hugetlbfs",
|
|
.mount = hugetlbfs_mount,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
static struct vfsmount *hugetlbfs_vfsmount;
|
|
|
|
static int can_do_hugetlb_shm(void)
|
|
{
|
|
return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group);
|
|
}
|
|
|
|
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
|
|
size_t size, vm_flags_t acctflag,
|
|
struct user_struct **user, int creat_flags)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct file *file;
|
|
struct inode *inode;
|
|
struct path path;
|
|
struct dentry *root;
|
|
struct qstr quick_string;
|
|
struct hstate *hstate;
|
|
unsigned long num_pages;
|
|
|
|
*user = NULL;
|
|
if (!hugetlbfs_vfsmount)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
|
|
*user = current_user();
|
|
if (user_shm_lock(size, *user)) {
|
|
task_lock(current);
|
|
printk_once(KERN_WARNING
|
|
"%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n",
|
|
current->comm, current->pid);
|
|
task_unlock(current);
|
|
} else {
|
|
*user = NULL;
|
|
return ERR_PTR(-EPERM);
|
|
}
|
|
}
|
|
|
|
root = hugetlbfs_vfsmount->mnt_root;
|
|
quick_string.name = name;
|
|
quick_string.len = strlen(quick_string.name);
|
|
quick_string.hash = 0;
|
|
path.dentry = d_alloc(root, &quick_string);
|
|
if (!path.dentry)
|
|
goto out_shm_unlock;
|
|
|
|
path.mnt = mntget(hugetlbfs_vfsmount);
|
|
error = -ENOSPC;
|
|
inode = hugetlbfs_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0);
|
|
if (!inode)
|
|
goto out_dentry;
|
|
|
|
hstate = hstate_inode(inode);
|
|
size += addr & ~huge_page_mask(hstate);
|
|
num_pages = ALIGN(size, huge_page_size(hstate)) >>
|
|
huge_page_shift(hstate);
|
|
error = -ENOMEM;
|
|
if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag))
|
|
goto out_inode;
|
|
|
|
d_instantiate(path.dentry, inode);
|
|
inode->i_size = size;
|
|
clear_nlink(inode);
|
|
|
|
error = -ENFILE;
|
|
file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
|
|
&hugetlbfs_file_operations);
|
|
if (!file)
|
|
goto out_dentry; /* inode is already attached */
|
|
|
|
return file;
|
|
|
|
out_inode:
|
|
iput(inode);
|
|
out_dentry:
|
|
path_put(&path);
|
|
out_shm_unlock:
|
|
if (*user) {
|
|
user_shm_unlock(size, *user);
|
|
*user = NULL;
|
|
}
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
static int __init init_hugetlbfs_fs(void)
|
|
{
|
|
int error;
|
|
struct vfsmount *vfsmount;
|
|
|
|
error = bdi_init(&hugetlbfs_backing_dev_info);
|
|
if (error)
|
|
return error;
|
|
|
|
error = -ENOMEM;
|
|
hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
|
|
sizeof(struct hugetlbfs_inode_info),
|
|
0, 0, init_once);
|
|
if (hugetlbfs_inode_cachep == NULL)
|
|
goto out2;
|
|
|
|
error = register_filesystem(&hugetlbfs_fs_type);
|
|
if (error)
|
|
goto out;
|
|
|
|
vfsmount = kern_mount(&hugetlbfs_fs_type);
|
|
|
|
if (!IS_ERR(vfsmount)) {
|
|
hugetlbfs_vfsmount = vfsmount;
|
|
return 0;
|
|
}
|
|
|
|
error = PTR_ERR(vfsmount);
|
|
|
|
out:
|
|
kmem_cache_destroy(hugetlbfs_inode_cachep);
|
|
out2:
|
|
bdi_destroy(&hugetlbfs_backing_dev_info);
|
|
return error;
|
|
}
|
|
|
|
static void __exit exit_hugetlbfs_fs(void)
|
|
{
|
|
kmem_cache_destroy(hugetlbfs_inode_cachep);
|
|
kern_unmount(hugetlbfs_vfsmount);
|
|
unregister_filesystem(&hugetlbfs_fs_type);
|
|
bdi_destroy(&hugetlbfs_backing_dev_info);
|
|
}
|
|
|
|
module_init(init_hugetlbfs_fs)
|
|
module_exit(exit_hugetlbfs_fs)
|
|
|
|
MODULE_LICENSE("GPL");
|