11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * hugetlbpage-backed filesystem. Based on ramfs. 31da177e4SLinus Torvalds * 46d49e352SNadia Yvette Chambers * Nadia Yvette Chambers, 2002 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 2002 Linus Torvalds. 73e89e1c5SPaul Gortmaker * License: GPL 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 109b857d26SAndrew Morton #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 119b857d26SAndrew Morton 121da177e4SLinus Torvalds #include <linux/thread_info.h> 131da177e4SLinus Torvalds #include <asm/current.h> 14174cd4b1SIngo Molnar #include <linux/sched/signal.h> /* remove ASAP */ 1570c3547eSMike Kravetz #include <linux/falloc.h> 161da177e4SLinus Torvalds #include <linux/fs.h> 171da177e4SLinus Torvalds #include <linux/mount.h> 181da177e4SLinus Torvalds #include <linux/file.h> 19e73a75faSRandy Dunlap #include <linux/kernel.h> 201da177e4SLinus Torvalds #include <linux/writeback.h> 211da177e4SLinus Torvalds #include <linux/pagemap.h> 221da177e4SLinus Torvalds #include <linux/highmem.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <linux/string.h> 2516f7e0feSRandy Dunlap #include <linux/capability.h> 26e73a75faSRandy Dunlap #include <linux/ctype.h> 271da177e4SLinus Torvalds #include <linux/backing-dev.h> 281da177e4SLinus Torvalds #include <linux/hugetlb.h> 291da177e4SLinus Torvalds #include <linux/pagevec.h> 30e73a75faSRandy Dunlap #include <linux/parser.h> 31036e0856SBenjamin Herrenschmidt #include <linux/mman.h> 321da177e4SLinus Torvalds #include <linux/slab.h> 331da177e4SLinus Torvalds #include <linux/dnotify.h> 341da177e4SLinus Torvalds #include <linux/statfs.h> 351da177e4SLinus Torvalds #include <linux/security.h> 361fd7317dSNick Black #include <linux/magic.h> 37290408d4SNaoya Horiguchi #include <linux/migrate.h> 3834d0640eSAl Viro #include <linux/uio.h> 391da177e4SLinus Torvalds 407c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 411da177e4SLinus Torvalds 42ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops; 43f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops; 444b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations; 4592e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations; 4692e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations; 471da177e4SLinus Torvalds 48a1d776eeSDavid Gibson struct hugetlbfs_config { 494a25220dSDavid Howells struct hstate *hstate; 504a25220dSDavid Howells long max_hpages; 514a25220dSDavid Howells long nr_inodes; 524a25220dSDavid Howells long min_hpages; 53a0eb3a05SEric W. Biederman kuid_t uid; 54a0eb3a05SEric W. Biederman kgid_t gid; 55a1d776eeSDavid Gibson umode_t mode; 56a1d776eeSDavid Gibson }; 57a1d776eeSDavid Gibson 58a1d776eeSDavid Gibson struct hugetlbfs_inode_info { 59a1d776eeSDavid Gibson struct shared_policy policy; 60a1d776eeSDavid Gibson struct inode vfs_inode; 61a1d776eeSDavid Gibson }; 62a1d776eeSDavid Gibson 63a1d776eeSDavid Gibson static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 64a1d776eeSDavid Gibson { 65a1d776eeSDavid Gibson return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 66a1d776eeSDavid Gibson } 67a1d776eeSDavid Gibson 681da177e4SLinus Torvalds int sysctl_hugetlb_shm_group; 691da177e4SLinus Torvalds 70e73a75faSRandy Dunlap enum { 71e73a75faSRandy Dunlap Opt_size, Opt_nr_inodes, 72e73a75faSRandy Dunlap Opt_mode, Opt_uid, Opt_gid, 737ca02d0aSMike Kravetz Opt_pagesize, Opt_min_size, 74e73a75faSRandy Dunlap Opt_err, 75e73a75faSRandy Dunlap }; 76e73a75faSRandy Dunlap 77a447c093SSteven Whitehouse static const match_table_t tokens = { 78e73a75faSRandy Dunlap {Opt_size, "size=%s"}, 79e73a75faSRandy Dunlap {Opt_nr_inodes, "nr_inodes=%s"}, 80e73a75faSRandy Dunlap {Opt_mode, "mode=%o"}, 81e73a75faSRandy Dunlap {Opt_uid, "uid=%u"}, 82e73a75faSRandy Dunlap {Opt_gid, "gid=%u"}, 83a137e1ccSAndi Kleen {Opt_pagesize, "pagesize=%s"}, 847ca02d0aSMike Kravetz {Opt_min_size, "min_size=%s"}, 85e73a75faSRandy Dunlap {Opt_err, NULL}, 86e73a75faSRandy Dunlap }; 87e73a75faSRandy Dunlap 8870c3547eSMike Kravetz #ifdef CONFIG_NUMA 8970c3547eSMike Kravetz static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, 9070c3547eSMike Kravetz struct inode *inode, pgoff_t index) 9170c3547eSMike Kravetz { 9270c3547eSMike Kravetz vma->vm_policy = mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy, 9370c3547eSMike Kravetz index); 9470c3547eSMike Kravetz } 9570c3547eSMike Kravetz 9670c3547eSMike Kravetz static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) 9770c3547eSMike Kravetz { 9870c3547eSMike Kravetz mpol_cond_put(vma->vm_policy); 9970c3547eSMike Kravetz } 10070c3547eSMike Kravetz #else 10170c3547eSMike Kravetz static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, 10270c3547eSMike Kravetz struct inode *inode, pgoff_t index) 10370c3547eSMike Kravetz { 10470c3547eSMike Kravetz } 10570c3547eSMike Kravetz 10670c3547eSMike Kravetz static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) 10770c3547eSMike Kravetz { 10870c3547eSMike Kravetz } 10970c3547eSMike Kravetz #endif 11070c3547eSMike Kravetz 1112e9b367cSAdam Litke static void huge_pagevec_release(struct pagevec *pvec) 1122e9b367cSAdam Litke { 1132e9b367cSAdam Litke int i; 1142e9b367cSAdam Litke 1152e9b367cSAdam Litke for (i = 0; i < pagevec_count(pvec); ++i) 1162e9b367cSAdam Litke put_page(pvec->pages[i]); 1172e9b367cSAdam Litke 1182e9b367cSAdam Litke pagevec_reinit(pvec); 1192e9b367cSAdam Litke } 1202e9b367cSAdam Litke 1211da177e4SLinus Torvalds static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) 1221da177e4SLinus Torvalds { 123496ad9aaSAl Viro struct inode *inode = file_inode(file); 1241da177e4SLinus Torvalds loff_t len, vma_len; 1251da177e4SLinus Torvalds int ret; 126a5516438SAndi Kleen struct hstate *h = hstate_file(file); 1271da177e4SLinus Torvalds 12868589bc3SHugh Dickins /* 129dec4ad86SDavid Gibson * vma address alignment (but not the pgoff alignment) has 130dec4ad86SDavid Gibson * already been checked by prepare_hugepage_range. If you add 131dec4ad86SDavid Gibson * any error returns here, do so after setting VM_HUGETLB, so 132dec4ad86SDavid Gibson * is_vm_hugetlb_page tests below unmap_region go the right 133dec4ad86SDavid Gibson * way when do_mmap_pgoff unwinds (may be important on powerpc 134dec4ad86SDavid Gibson * and ia64). 13568589bc3SHugh Dickins */ 136a2fce914SNaoya Horiguchi vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; 13768589bc3SHugh Dickins vma->vm_ops = &hugetlb_vm_ops; 1381da177e4SLinus Torvalds 139045c7a3fSMike Kravetz /* 140045c7a3fSMike Kravetz * Offset passed to mmap (before page shift) could have been 141045c7a3fSMike Kravetz * negative when represented as a (l)off_t. 142045c7a3fSMike Kravetz */ 143045c7a3fSMike Kravetz if (((loff_t)vma->vm_pgoff << PAGE_SHIFT) < 0) 144045c7a3fSMike Kravetz return -EINVAL; 145045c7a3fSMike Kravetz 1462b37c35eSBecky Bruce if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) 147dec4ad86SDavid Gibson return -EINVAL; 148dec4ad86SDavid Gibson 1491da177e4SLinus Torvalds vma_len = (loff_t)(vma->vm_end - vma->vm_start); 150045c7a3fSMike Kravetz len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 151045c7a3fSMike Kravetz /* check for overflow */ 152045c7a3fSMike Kravetz if (len < vma_len) 153045c7a3fSMike Kravetz return -EINVAL; 1541da177e4SLinus Torvalds 1555955102cSAl Viro inode_lock(inode); 1561da177e4SLinus Torvalds file_accessed(file); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds ret = -ENOMEM; 159a1e78772SMel Gorman if (hugetlb_reserve_pages(inode, 160a5516438SAndi Kleen vma->vm_pgoff >> huge_page_order(h), 1615a6fe125SMel Gorman len >> huge_page_shift(h), vma, 1625a6fe125SMel Gorman vma->vm_flags)) 163b45b5bd6SDavid Gibson goto out; 164b45b5bd6SDavid Gibson 1654c887265SAdam Litke ret = 0; 166b6174df5SZhang, Yanmin if (vma->vm_flags & VM_WRITE && inode->i_size < len) 167045c7a3fSMike Kravetz i_size_write(inode, len); 1681da177e4SLinus Torvalds out: 1695955102cSAl Viro inode_unlock(inode); 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds return ret; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* 175508034a3SHugh Dickins * Called under down_write(mmap_sem). 1761da177e4SLinus Torvalds */ 1771da177e4SLinus Torvalds 178d2ba27e8SAdrian Bunk #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 1791da177e4SLinus Torvalds static unsigned long 1801da177e4SLinus Torvalds hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 1811da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, unsigned long flags) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds struct mm_struct *mm = current->mm; 1841da177e4SLinus Torvalds struct vm_area_struct *vma; 185a5516438SAndi Kleen struct hstate *h = hstate_file(file); 18608659355SMichel Lespinasse struct vm_unmapped_area_info info; 1871da177e4SLinus Torvalds 188a5516438SAndi Kleen if (len & ~huge_page_mask(h)) 1891da177e4SLinus Torvalds return -EINVAL; 1901da177e4SLinus Torvalds if (len > TASK_SIZE) 1911da177e4SLinus Torvalds return -ENOMEM; 1921da177e4SLinus Torvalds 193036e0856SBenjamin Herrenschmidt if (flags & MAP_FIXED) { 194a5516438SAndi Kleen if (prepare_hugepage_range(file, addr, len)) 195036e0856SBenjamin Herrenschmidt return -EINVAL; 196036e0856SBenjamin Herrenschmidt return addr; 197036e0856SBenjamin Herrenschmidt } 198036e0856SBenjamin Herrenschmidt 1991da177e4SLinus Torvalds if (addr) { 200a5516438SAndi Kleen addr = ALIGN(addr, huge_page_size(h)); 2011da177e4SLinus Torvalds vma = find_vma(mm, addr); 2021da177e4SLinus Torvalds if (TASK_SIZE - len >= addr && 2031be7107fSHugh Dickins (!vma || addr + len <= vm_start_gap(vma))) 2041da177e4SLinus Torvalds return addr; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 20708659355SMichel Lespinasse info.flags = 0; 20808659355SMichel Lespinasse info.length = len; 20908659355SMichel Lespinasse info.low_limit = TASK_UNMAPPED_BASE; 21008659355SMichel Lespinasse info.high_limit = TASK_SIZE; 21108659355SMichel Lespinasse info.align_mask = PAGE_MASK & ~huge_page_mask(h); 21208659355SMichel Lespinasse info.align_offset = 0; 21308659355SMichel Lespinasse return vm_unmapped_area(&info); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds #endif 2161da177e4SLinus Torvalds 21734d0640eSAl Viro static size_t 218e63e1e5aSBadari Pulavarty hugetlbfs_read_actor(struct page *page, unsigned long offset, 21934d0640eSAl Viro struct iov_iter *to, unsigned long size) 220e63e1e5aSBadari Pulavarty { 22134d0640eSAl Viro size_t copied = 0; 222e63e1e5aSBadari Pulavarty int i, chunksize; 223e63e1e5aSBadari Pulavarty 224e63e1e5aSBadari Pulavarty /* Find which 4k chunk and offset with in that chunk */ 22509cbfeafSKirill A. Shutemov i = offset >> PAGE_SHIFT; 22609cbfeafSKirill A. Shutemov offset = offset & ~PAGE_MASK; 227e63e1e5aSBadari Pulavarty 228e63e1e5aSBadari Pulavarty while (size) { 22934d0640eSAl Viro size_t n; 23009cbfeafSKirill A. Shutemov chunksize = PAGE_SIZE; 231e63e1e5aSBadari Pulavarty if (offset) 232e63e1e5aSBadari Pulavarty chunksize -= offset; 233e63e1e5aSBadari Pulavarty if (chunksize > size) 234e63e1e5aSBadari Pulavarty chunksize = size; 23534d0640eSAl Viro n = copy_page_to_iter(&page[i], offset, chunksize, to); 23634d0640eSAl Viro copied += n; 23734d0640eSAl Viro if (n != chunksize) 23834d0640eSAl Viro return copied; 239e63e1e5aSBadari Pulavarty offset = 0; 240e63e1e5aSBadari Pulavarty size -= chunksize; 241e63e1e5aSBadari Pulavarty i++; 242e63e1e5aSBadari Pulavarty } 24334d0640eSAl Viro return copied; 244e63e1e5aSBadari Pulavarty } 245e63e1e5aSBadari Pulavarty 246e63e1e5aSBadari Pulavarty /* 247e63e1e5aSBadari Pulavarty * Support for read() - Find the page attached to f_mapping and copy out the 248e63e1e5aSBadari Pulavarty * data. Its *very* similar to do_generic_mapping_read(), we can't use that 249ea1754a0SKirill A. Shutemov * since it has PAGE_SIZE assumptions. 250e63e1e5aSBadari Pulavarty */ 25134d0640eSAl Viro static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) 252e63e1e5aSBadari Pulavarty { 25334d0640eSAl Viro struct file *file = iocb->ki_filp; 25434d0640eSAl Viro struct hstate *h = hstate_file(file); 25534d0640eSAl Viro struct address_space *mapping = file->f_mapping; 256e63e1e5aSBadari Pulavarty struct inode *inode = mapping->host; 25734d0640eSAl Viro unsigned long index = iocb->ki_pos >> huge_page_shift(h); 25834d0640eSAl Viro unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); 259e63e1e5aSBadari Pulavarty unsigned long end_index; 260e63e1e5aSBadari Pulavarty loff_t isize; 261e63e1e5aSBadari Pulavarty ssize_t retval = 0; 262e63e1e5aSBadari Pulavarty 26334d0640eSAl Viro while (iov_iter_count(to)) { 264e63e1e5aSBadari Pulavarty struct page *page; 26534d0640eSAl Viro size_t nr, copied; 266e63e1e5aSBadari Pulavarty 267e63e1e5aSBadari Pulavarty /* nr is the maximum number of bytes to copy from this page */ 268a5516438SAndi Kleen nr = huge_page_size(h); 269a05b0855SAneesh Kumar K.V isize = i_size_read(inode); 270a05b0855SAneesh Kumar K.V if (!isize) 27134d0640eSAl Viro break; 272a05b0855SAneesh Kumar K.V end_index = (isize - 1) >> huge_page_shift(h); 273e63e1e5aSBadari Pulavarty if (index > end_index) 27434d0640eSAl Viro break; 27534d0640eSAl Viro if (index == end_index) { 276a5516438SAndi Kleen nr = ((isize - 1) & ~huge_page_mask(h)) + 1; 277a05b0855SAneesh Kumar K.V if (nr <= offset) 27834d0640eSAl Viro break; 279e63e1e5aSBadari Pulavarty } 280e63e1e5aSBadari Pulavarty nr = nr - offset; 281e63e1e5aSBadari Pulavarty 282e63e1e5aSBadari Pulavarty /* Find the page */ 283a05b0855SAneesh Kumar K.V page = find_lock_page(mapping, index); 284e63e1e5aSBadari Pulavarty if (unlikely(page == NULL)) { 285e63e1e5aSBadari Pulavarty /* 286e63e1e5aSBadari Pulavarty * We have a HOLE, zero out the user-buffer for the 287e63e1e5aSBadari Pulavarty * length of the hole or request. 288e63e1e5aSBadari Pulavarty */ 28934d0640eSAl Viro copied = iov_iter_zero(nr, to); 290e63e1e5aSBadari Pulavarty } else { 291a05b0855SAneesh Kumar K.V unlock_page(page); 292a05b0855SAneesh Kumar K.V 293e63e1e5aSBadari Pulavarty /* 294e63e1e5aSBadari Pulavarty * We have the page, copy it to user space buffer. 295e63e1e5aSBadari Pulavarty */ 29634d0640eSAl Viro copied = hugetlbfs_read_actor(page, offset, to, nr); 29709cbfeafSKirill A. Shutemov put_page(page); 298e63e1e5aSBadari Pulavarty } 29934d0640eSAl Viro offset += copied; 30034d0640eSAl Viro retval += copied; 30134d0640eSAl Viro if (copied != nr && iov_iter_count(to)) { 30234d0640eSAl Viro if (!retval) 30334d0640eSAl Viro retval = -EFAULT; 304e63e1e5aSBadari Pulavarty break; 305e63e1e5aSBadari Pulavarty } 30634d0640eSAl Viro index += offset >> huge_page_shift(h); 30734d0640eSAl Viro offset &= ~huge_page_mask(h); 30834d0640eSAl Viro } 30934d0640eSAl Viro iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; 310e63e1e5aSBadari Pulavarty return retval; 311e63e1e5aSBadari Pulavarty } 312e63e1e5aSBadari Pulavarty 313800d15a5SNick Piggin static int hugetlbfs_write_begin(struct file *file, 314800d15a5SNick Piggin struct address_space *mapping, 315800d15a5SNick Piggin loff_t pos, unsigned len, unsigned flags, 316800d15a5SNick Piggin struct page **pagep, void **fsdata) 3171da177e4SLinus Torvalds { 3181da177e4SLinus Torvalds return -EINVAL; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 321800d15a5SNick Piggin static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, 322800d15a5SNick Piggin loff_t pos, unsigned len, unsigned copied, 323800d15a5SNick Piggin struct page *page, void *fsdata) 3241da177e4SLinus Torvalds { 325800d15a5SNick Piggin BUG(); 3261da177e4SLinus Torvalds return -EINVAL; 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 329b5cec28dSMike Kravetz static void remove_huge_page(struct page *page) 3301da177e4SLinus Torvalds { 331b9ea2515SKonstantin Khlebnikov ClearPageDirty(page); 3321da177e4SLinus Torvalds ClearPageUptodate(page); 333bd65cb86SMinchan Kim delete_from_page_cache(page); 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 3364aae8d1cSMike Kravetz static void 3374aae8d1cSMike Kravetz hugetlb_vmdelete_list(struct rb_root *root, pgoff_t start, pgoff_t end) 3384aae8d1cSMike Kravetz { 3394aae8d1cSMike Kravetz struct vm_area_struct *vma; 3404aae8d1cSMike Kravetz 3414aae8d1cSMike Kravetz /* 3424aae8d1cSMike Kravetz * end == 0 indicates that the entire range after 3434aae8d1cSMike Kravetz * start should be unmapped. 3444aae8d1cSMike Kravetz */ 3454aae8d1cSMike Kravetz vma_interval_tree_foreach(vma, root, start, end ? end : ULONG_MAX) { 3464aae8d1cSMike Kravetz unsigned long v_offset; 3474aae8d1cSMike Kravetz unsigned long v_end; 3484aae8d1cSMike Kravetz 3494aae8d1cSMike Kravetz /* 3504aae8d1cSMike Kravetz * Can the expression below overflow on 32-bit arches? 3514aae8d1cSMike Kravetz * No, because the interval tree returns us only those vmas 3524aae8d1cSMike Kravetz * which overlap the truncated area starting at pgoff, 3534aae8d1cSMike Kravetz * and no vma on a 32-bit arch can span beyond the 4GB. 3544aae8d1cSMike Kravetz */ 3554aae8d1cSMike Kravetz if (vma->vm_pgoff < start) 3564aae8d1cSMike Kravetz v_offset = (start - vma->vm_pgoff) << PAGE_SHIFT; 3574aae8d1cSMike Kravetz else 3584aae8d1cSMike Kravetz v_offset = 0; 3594aae8d1cSMike Kravetz 3604aae8d1cSMike Kravetz if (!end) 3614aae8d1cSMike Kravetz v_end = vma->vm_end; 3624aae8d1cSMike Kravetz else { 3634aae8d1cSMike Kravetz v_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) 3644aae8d1cSMike Kravetz + vma->vm_start; 3654aae8d1cSMike Kravetz if (v_end > vma->vm_end) 3664aae8d1cSMike Kravetz v_end = vma->vm_end; 3674aae8d1cSMike Kravetz } 3684aae8d1cSMike Kravetz 3694aae8d1cSMike Kravetz unmap_hugepage_range(vma, vma->vm_start + v_offset, v_end, 3704aae8d1cSMike Kravetz NULL); 3714aae8d1cSMike Kravetz } 3724aae8d1cSMike Kravetz } 373b5cec28dSMike Kravetz 374b5cec28dSMike Kravetz /* 375b5cec28dSMike Kravetz * remove_inode_hugepages handles two distinct cases: truncation and hole 376b5cec28dSMike Kravetz * punch. There are subtle differences in operation for each case. 3774aae8d1cSMike Kravetz * 378b5cec28dSMike Kravetz * truncation is indicated by end of range being LLONG_MAX 379b5cec28dSMike Kravetz * In this case, we first scan the range and release found pages. 380b5cec28dSMike Kravetz * After releasing pages, hugetlb_unreserve_pages cleans up region/reserv 3811817889eSMike Kravetz * maps and global counts. Page faults can not race with truncation 3821817889eSMike Kravetz * in this routine. hugetlb_no_page() prevents page faults in the 3831817889eSMike Kravetz * truncated range. It checks i_size before allocation, and again after 3841817889eSMike Kravetz * with the page table lock for the page held. The same lock must be 3851817889eSMike Kravetz * acquired to unmap a page. 386b5cec28dSMike Kravetz * hole punch is indicated if end is not LLONG_MAX 387b5cec28dSMike Kravetz * In the hole punch case we scan the range and release found pages. 388b5cec28dSMike Kravetz * Only when releasing a page is the associated region/reserv map 389b5cec28dSMike Kravetz * deleted. The region/reserv map for ranges without associated 3901817889eSMike Kravetz * pages are not modified. Page faults can race with hole punch. 3911817889eSMike Kravetz * This is indicated if we find a mapped page. 392b5cec28dSMike Kravetz * Note: If the passed end of range value is beyond the end of file, but 393b5cec28dSMike Kravetz * not LLONG_MAX this routine still performs a hole punch operation. 394b5cec28dSMike Kravetz */ 395b5cec28dSMike Kravetz static void remove_inode_hugepages(struct inode *inode, loff_t lstart, 396b5cec28dSMike Kravetz loff_t lend) 3971da177e4SLinus Torvalds { 398a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 399b45b5bd6SDavid Gibson struct address_space *mapping = &inode->i_data; 400a5516438SAndi Kleen const pgoff_t start = lstart >> huge_page_shift(h); 401b5cec28dSMike Kravetz const pgoff_t end = lend >> huge_page_shift(h); 402b5cec28dSMike Kravetz struct vm_area_struct pseudo_vma; 4031da177e4SLinus Torvalds struct pagevec pvec; 4041da177e4SLinus Torvalds pgoff_t next; 405a43a8c39SChen, Kenneth W int i, freed = 0; 406b5cec28dSMike Kravetz long lookup_nr = PAGEVEC_SIZE; 407b5cec28dSMike Kravetz bool truncate_op = (lend == LLONG_MAX); 4081da177e4SLinus Torvalds 409b5cec28dSMike Kravetz memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); 410b5cec28dSMike Kravetz pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); 4111da177e4SLinus Torvalds pagevec_init(&pvec, 0); 4121da177e4SLinus Torvalds next = start; 413b5cec28dSMike Kravetz while (next < end) { 414b5cec28dSMike Kravetz /* 4151817889eSMike Kravetz * Don't grab more pages than the number left in the range. 416b5cec28dSMike Kravetz */ 417b5cec28dSMike Kravetz if (end - next < lookup_nr) 418b5cec28dSMike Kravetz lookup_nr = end - next; 419b5cec28dSMike Kravetz 420b5cec28dSMike Kravetz /* 4211817889eSMike Kravetz * When no more pages are found, we are done. 422b5cec28dSMike Kravetz */ 4231817889eSMike Kravetz if (!pagevec_lookup(&pvec, mapping, next, lookup_nr)) 4241da177e4SLinus Torvalds break; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); ++i) { 4271da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 428b5cec28dSMike Kravetz u32 hash; 429b5cec28dSMike Kravetz 4301817889eSMike Kravetz /* 4311817889eSMike Kravetz * The page (index) could be beyond end. This is 4321817889eSMike Kravetz * only possible in the punch hole case as end is 4331817889eSMike Kravetz * max page offset in the truncate case. 4341817889eSMike Kravetz */ 4351817889eSMike Kravetz next = page->index; 4361817889eSMike Kravetz if (next >= end) 4371817889eSMike Kravetz break; 4381817889eSMike Kravetz 439b5cec28dSMike Kravetz hash = hugetlb_fault_mutex_hash(h, current->mm, 440b5cec28dSMike Kravetz &pseudo_vma, 441b5cec28dSMike Kravetz mapping, next, 0); 442b5cec28dSMike Kravetz mutex_lock(&hugetlb_fault_mutex_table[hash]); 4431da177e4SLinus Torvalds 444b5cec28dSMike Kravetz /* 4454aae8d1cSMike Kravetz * If page is mapped, it was faulted in after being 4464aae8d1cSMike Kravetz * unmapped in caller. Unmap (again) now after taking 4474aae8d1cSMike Kravetz * the fault mutex. The mutex will prevent faults 4484aae8d1cSMike Kravetz * until we finish removing the page. 4494aae8d1cSMike Kravetz * 4504aae8d1cSMike Kravetz * This race can only happen in the hole punch case. 4514aae8d1cSMike Kravetz * Getting here in a truncate operation is a bug. 452b5cec28dSMike Kravetz */ 4534aae8d1cSMike Kravetz if (unlikely(page_mapped(page))) { 4544aae8d1cSMike Kravetz BUG_ON(truncate_op); 4554aae8d1cSMike Kravetz 4564aae8d1cSMike Kravetz i_mmap_lock_write(mapping); 4574aae8d1cSMike Kravetz hugetlb_vmdelete_list(&mapping->i_mmap, 4584aae8d1cSMike Kravetz next * pages_per_huge_page(h), 4594aae8d1cSMike Kravetz (next + 1) * pages_per_huge_page(h)); 4604aae8d1cSMike Kravetz i_mmap_unlock_write(mapping); 4614aae8d1cSMike Kravetz } 4624aae8d1cSMike Kravetz 4634aae8d1cSMike Kravetz lock_page(page); 4644aae8d1cSMike Kravetz /* 4654aae8d1cSMike Kravetz * We must free the huge page and remove from page 4664aae8d1cSMike Kravetz * cache (remove_huge_page) BEFORE removing the 4674aae8d1cSMike Kravetz * region/reserve map (hugetlb_unreserve_pages). In 4684aae8d1cSMike Kravetz * rare out of memory conditions, removal of the 46972e2936cSzhong jiang * region/reserve map could fail. Correspondingly, 47072e2936cSzhong jiang * the subpool and global reserve usage count can need 47172e2936cSzhong jiang * to be adjusted. 4724aae8d1cSMike Kravetz */ 47372e2936cSzhong jiang VM_BUG_ON(PagePrivate(page)); 474b5cec28dSMike Kravetz remove_huge_page(page); 475b5cec28dSMike Kravetz freed++; 476b5cec28dSMike Kravetz if (!truncate_op) { 4774aae8d1cSMike Kravetz if (unlikely(hugetlb_unreserve_pages(inode, 4784aae8d1cSMike Kravetz next, next + 1, 1))) 47972e2936cSzhong jiang hugetlb_fix_reserve_counts(inode); 480b5cec28dSMike Kravetz } 481b5cec28dSMike Kravetz 4821da177e4SLinus Torvalds unlock_page(page); 483b5cec28dSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 4841da177e4SLinus Torvalds } 4851817889eSMike Kravetz ++next; 4861da177e4SLinus Torvalds huge_pagevec_release(&pvec); 4871817889eSMike Kravetz cond_resched(); 4881da177e4SLinus Torvalds } 489b5cec28dSMike Kravetz 490b5cec28dSMike Kravetz if (truncate_op) 491b5cec28dSMike Kravetz (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4942bbbda30SAl Viro static void hugetlbfs_evict_inode(struct inode *inode) 4951da177e4SLinus Torvalds { 4969119a41eSJoonsoo Kim struct resv_map *resv_map; 4979119a41eSJoonsoo Kim 498b5cec28dSMike Kravetz remove_inode_hugepages(inode, 0, LLONG_MAX); 4999119a41eSJoonsoo Kim resv_map = (struct resv_map *)inode->i_mapping->private_data; 5009119a41eSJoonsoo Kim /* root inode doesn't have the resv_map, so we should check it */ 5019119a41eSJoonsoo Kim if (resv_map) 5029119a41eSJoonsoo Kim resv_map_release(&resv_map->refs); 503dbd5768fSJan Kara clear_inode(inode); 504149f4211SChristoph Hellwig } 505149f4211SChristoph Hellwig 5061da177e4SLinus Torvalds static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) 5071da177e4SLinus Torvalds { 508856fc295SHugh Dickins pgoff_t pgoff; 5091da177e4SLinus Torvalds struct address_space *mapping = inode->i_mapping; 510a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 5111da177e4SLinus Torvalds 512a5516438SAndi Kleen BUG_ON(offset & ~huge_page_mask(h)); 513856fc295SHugh Dickins pgoff = offset >> PAGE_SHIFT; 5141da177e4SLinus Torvalds 5157aa91e10SKen Chen i_size_write(inode, offset); 51683cde9e8SDavidlohr Bueso i_mmap_lock_write(mapping); 5176b2dbba8SMichel Lespinasse if (!RB_EMPTY_ROOT(&mapping->i_mmap)) 5181bfad99aSMike Kravetz hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0); 51983cde9e8SDavidlohr Bueso i_mmap_unlock_write(mapping); 520b5cec28dSMike Kravetz remove_inode_hugepages(inode, offset, LLONG_MAX); 5211da177e4SLinus Torvalds return 0; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 52470c3547eSMike Kravetz static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) 52570c3547eSMike Kravetz { 52670c3547eSMike Kravetz struct hstate *h = hstate_inode(inode); 52770c3547eSMike Kravetz loff_t hpage_size = huge_page_size(h); 52870c3547eSMike Kravetz loff_t hole_start, hole_end; 52970c3547eSMike Kravetz 53070c3547eSMike Kravetz /* 53170c3547eSMike Kravetz * For hole punch round up the beginning offset of the hole and 53270c3547eSMike Kravetz * round down the end. 53370c3547eSMike Kravetz */ 53470c3547eSMike Kravetz hole_start = round_up(offset, hpage_size); 53570c3547eSMike Kravetz hole_end = round_down(offset + len, hpage_size); 53670c3547eSMike Kravetz 53770c3547eSMike Kravetz if (hole_end > hole_start) { 53870c3547eSMike Kravetz struct address_space *mapping = inode->i_mapping; 53970c3547eSMike Kravetz 5405955102cSAl Viro inode_lock(inode); 54170c3547eSMike Kravetz i_mmap_lock_write(mapping); 54270c3547eSMike Kravetz if (!RB_EMPTY_ROOT(&mapping->i_mmap)) 54370c3547eSMike Kravetz hugetlb_vmdelete_list(&mapping->i_mmap, 54470c3547eSMike Kravetz hole_start >> PAGE_SHIFT, 54570c3547eSMike Kravetz hole_end >> PAGE_SHIFT); 54670c3547eSMike Kravetz i_mmap_unlock_write(mapping); 54770c3547eSMike Kravetz remove_inode_hugepages(inode, hole_start, hole_end); 5485955102cSAl Viro inode_unlock(inode); 54970c3547eSMike Kravetz } 55070c3547eSMike Kravetz 55170c3547eSMike Kravetz return 0; 55270c3547eSMike Kravetz } 55370c3547eSMike Kravetz 55470c3547eSMike Kravetz static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, 55570c3547eSMike Kravetz loff_t len) 55670c3547eSMike Kravetz { 55770c3547eSMike Kravetz struct inode *inode = file_inode(file); 55870c3547eSMike Kravetz struct address_space *mapping = inode->i_mapping; 55970c3547eSMike Kravetz struct hstate *h = hstate_inode(inode); 56070c3547eSMike Kravetz struct vm_area_struct pseudo_vma; 56170c3547eSMike Kravetz struct mm_struct *mm = current->mm; 56270c3547eSMike Kravetz loff_t hpage_size = huge_page_size(h); 56370c3547eSMike Kravetz unsigned long hpage_shift = huge_page_shift(h); 56470c3547eSMike Kravetz pgoff_t start, index, end; 56570c3547eSMike Kravetz int error; 56670c3547eSMike Kravetz u32 hash; 56770c3547eSMike Kravetz 56870c3547eSMike Kravetz if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 56970c3547eSMike Kravetz return -EOPNOTSUPP; 57070c3547eSMike Kravetz 57170c3547eSMike Kravetz if (mode & FALLOC_FL_PUNCH_HOLE) 57270c3547eSMike Kravetz return hugetlbfs_punch_hole(inode, offset, len); 57370c3547eSMike Kravetz 57470c3547eSMike Kravetz /* 57570c3547eSMike Kravetz * Default preallocate case. 57670c3547eSMike Kravetz * For this range, start is rounded down and end is rounded up 57770c3547eSMike Kravetz * as well as being converted to page offsets. 57870c3547eSMike Kravetz */ 57970c3547eSMike Kravetz start = offset >> hpage_shift; 58070c3547eSMike Kravetz end = (offset + len + hpage_size - 1) >> hpage_shift; 58170c3547eSMike Kravetz 5825955102cSAl Viro inode_lock(inode); 58370c3547eSMike Kravetz 58470c3547eSMike Kravetz /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ 58570c3547eSMike Kravetz error = inode_newsize_ok(inode, offset + len); 58670c3547eSMike Kravetz if (error) 58770c3547eSMike Kravetz goto out; 58870c3547eSMike Kravetz 58970c3547eSMike Kravetz /* 59070c3547eSMike Kravetz * Initialize a pseudo vma as this is required by the huge page 59170c3547eSMike Kravetz * allocation routines. If NUMA is configured, use page index 59270c3547eSMike Kravetz * as input to create an allocation policy. 59370c3547eSMike Kravetz */ 59470c3547eSMike Kravetz memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); 59570c3547eSMike Kravetz pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); 59670c3547eSMike Kravetz pseudo_vma.vm_file = file; 59770c3547eSMike Kravetz 59870c3547eSMike Kravetz for (index = start; index < end; index++) { 59970c3547eSMike Kravetz /* 60070c3547eSMike Kravetz * This is supposed to be the vaddr where the page is being 60170c3547eSMike Kravetz * faulted in, but we have no vaddr here. 60270c3547eSMike Kravetz */ 60370c3547eSMike Kravetz struct page *page; 60470c3547eSMike Kravetz unsigned long addr; 60570c3547eSMike Kravetz int avoid_reserve = 0; 60670c3547eSMike Kravetz 60770c3547eSMike Kravetz cond_resched(); 60870c3547eSMike Kravetz 60970c3547eSMike Kravetz /* 61070c3547eSMike Kravetz * fallocate(2) manpage permits EINTR; we may have been 61170c3547eSMike Kravetz * interrupted because we are using up too much memory. 61270c3547eSMike Kravetz */ 61370c3547eSMike Kravetz if (signal_pending(current)) { 61470c3547eSMike Kravetz error = -EINTR; 61570c3547eSMike Kravetz break; 61670c3547eSMike Kravetz } 61770c3547eSMike Kravetz 61870c3547eSMike Kravetz /* Set numa allocation policy based on index */ 61970c3547eSMike Kravetz hugetlb_set_vma_policy(&pseudo_vma, inode, index); 62070c3547eSMike Kravetz 62170c3547eSMike Kravetz /* addr is the offset within the file (zero based) */ 62270c3547eSMike Kravetz addr = index * hpage_size; 62370c3547eSMike Kravetz 62470c3547eSMike Kravetz /* mutex taken here, fault path and hole punch */ 62570c3547eSMike Kravetz hash = hugetlb_fault_mutex_hash(h, mm, &pseudo_vma, mapping, 62670c3547eSMike Kravetz index, addr); 62770c3547eSMike Kravetz mutex_lock(&hugetlb_fault_mutex_table[hash]); 62870c3547eSMike Kravetz 62970c3547eSMike Kravetz /* See if already present in mapping to avoid alloc/free */ 63070c3547eSMike Kravetz page = find_get_page(mapping, index); 63170c3547eSMike Kravetz if (page) { 63270c3547eSMike Kravetz put_page(page); 63370c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 63470c3547eSMike Kravetz hugetlb_drop_vma_policy(&pseudo_vma); 63570c3547eSMike Kravetz continue; 63670c3547eSMike Kravetz } 63770c3547eSMike Kravetz 63870c3547eSMike Kravetz /* Allocate page and add to page cache */ 63970c3547eSMike Kravetz page = alloc_huge_page(&pseudo_vma, addr, avoid_reserve); 64070c3547eSMike Kravetz hugetlb_drop_vma_policy(&pseudo_vma); 64170c3547eSMike Kravetz if (IS_ERR(page)) { 64270c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 64370c3547eSMike Kravetz error = PTR_ERR(page); 64470c3547eSMike Kravetz goto out; 64570c3547eSMike Kravetz } 64670c3547eSMike Kravetz clear_huge_page(page, addr, pages_per_huge_page(h)); 64770c3547eSMike Kravetz __SetPageUptodate(page); 64870c3547eSMike Kravetz error = huge_add_to_page_cache(page, mapping, index); 64970c3547eSMike Kravetz if (unlikely(error)) { 65070c3547eSMike Kravetz put_page(page); 65170c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 65270c3547eSMike Kravetz goto out; 65370c3547eSMike Kravetz } 65470c3547eSMike Kravetz 65570c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 65670c3547eSMike Kravetz 65770c3547eSMike Kravetz /* 65870c3547eSMike Kravetz * page_put due to reference from alloc_huge_page() 65970c3547eSMike Kravetz * unlock_page because locked by add_to_page_cache() 66070c3547eSMike Kravetz */ 66170c3547eSMike Kravetz put_page(page); 66270c3547eSMike Kravetz unlock_page(page); 66370c3547eSMike Kravetz } 66470c3547eSMike Kravetz 66570c3547eSMike Kravetz if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) 66670c3547eSMike Kravetz i_size_write(inode, offset + len); 667078cd827SDeepa Dinamani inode->i_ctime = current_time(inode); 66870c3547eSMike Kravetz out: 6695955102cSAl Viro inode_unlock(inode); 67070c3547eSMike Kravetz return error; 67170c3547eSMike Kravetz } 67270c3547eSMike Kravetz 6731da177e4SLinus Torvalds static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) 6741da177e4SLinus Torvalds { 6752b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 676a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 6771da177e4SLinus Torvalds int error; 6781da177e4SLinus Torvalds unsigned int ia_valid = attr->ia_valid; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds BUG_ON(!inode); 6811da177e4SLinus Torvalds 68231051c85SJan Kara error = setattr_prepare(dentry, attr); 6831da177e4SLinus Torvalds if (error) 6841025774cSChristoph Hellwig return error; 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds if (ia_valid & ATTR_SIZE) { 6871da177e4SLinus Torvalds error = -EINVAL; 6881025774cSChristoph Hellwig if (attr->ia_size & ~huge_page_mask(h)) 6891025774cSChristoph Hellwig return -EINVAL; 6901da177e4SLinus Torvalds error = hugetlb_vmtruncate(inode, attr->ia_size); 6911da177e4SLinus Torvalds if (error) 6921da177e4SLinus Torvalds return error; 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951025774cSChristoph Hellwig setattr_copy(inode, attr); 6961025774cSChristoph Hellwig mark_inode_dirty(inode); 6971025774cSChristoph Hellwig return 0; 6981025774cSChristoph Hellwig } 6991025774cSChristoph Hellwig 7007d54fa64SAl Viro static struct inode *hugetlbfs_get_root(struct super_block *sb, 7017d54fa64SAl Viro struct hugetlbfs_config *config) 7021da177e4SLinus Torvalds { 7031da177e4SLinus Torvalds struct inode *inode; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds inode = new_inode(sb); 7061da177e4SLinus Torvalds if (inode) { 70785fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 7087d54fa64SAl Viro inode->i_mode = S_IFDIR | config->mode; 7097d54fa64SAl Viro inode->i_uid = config->uid; 7107d54fa64SAl Viro inode->i_gid = config->gid; 711078cd827SDeepa Dinamani inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 7127d54fa64SAl Viro inode->i_op = &hugetlbfs_dir_inode_operations; 7137d54fa64SAl Viro inode->i_fop = &simple_dir_operations; 7147d54fa64SAl Viro /* directory inodes start off with i_nlink == 2 (for "." entry) */ 7157d54fa64SAl Viro inc_nlink(inode); 71665ed7601SAneesh Kumar K.V lockdep_annotate_inode_mutex_key(inode); 7177d54fa64SAl Viro } 7187d54fa64SAl Viro return inode; 7197d54fa64SAl Viro } 7207d54fa64SAl Viro 721b610ded7SMichal Hocko /* 722c8c06efaSDavidlohr Bueso * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never 723b610ded7SMichal Hocko * be taken from reclaim -- unlike regular filesystems. This needs an 72488f306b6SKirill A. Shutemov * annotation because huge_pmd_share() does an allocation under hugetlb's 725c8c06efaSDavidlohr Bueso * i_mmap_rwsem. 726b610ded7SMichal Hocko */ 727c8c06efaSDavidlohr Bueso static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; 728b610ded7SMichal Hocko 7297d54fa64SAl Viro static struct inode *hugetlbfs_get_inode(struct super_block *sb, 7307d54fa64SAl Viro struct inode *dir, 73118df2252SAl Viro umode_t mode, dev_t dev) 7327d54fa64SAl Viro { 7337d54fa64SAl Viro struct inode *inode; 7349119a41eSJoonsoo Kim struct resv_map *resv_map; 7359119a41eSJoonsoo Kim 7369119a41eSJoonsoo Kim resv_map = resv_map_alloc(); 7379119a41eSJoonsoo Kim if (!resv_map) 7389119a41eSJoonsoo Kim return NULL; 7397d54fa64SAl Viro 7407d54fa64SAl Viro inode = new_inode(sb); 7417d54fa64SAl Viro if (inode) { 7427d54fa64SAl Viro inode->i_ino = get_next_ino(); 7437d54fa64SAl Viro inode_init_owner(inode, dir, mode); 744c8c06efaSDavidlohr Bueso lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, 745c8c06efaSDavidlohr Bueso &hugetlbfs_i_mmap_rwsem_key); 7461da177e4SLinus Torvalds inode->i_mapping->a_ops = &hugetlbfs_aops; 747078cd827SDeepa Dinamani inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 7489119a41eSJoonsoo Kim inode->i_mapping->private_data = resv_map; 7491da177e4SLinus Torvalds switch (mode & S_IFMT) { 7501da177e4SLinus Torvalds default: 7511da177e4SLinus Torvalds init_special_inode(inode, mode, dev); 7521da177e4SLinus Torvalds break; 7531da177e4SLinus Torvalds case S_IFREG: 7541da177e4SLinus Torvalds inode->i_op = &hugetlbfs_inode_operations; 7551da177e4SLinus Torvalds inode->i_fop = &hugetlbfs_file_operations; 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds case S_IFDIR: 7581da177e4SLinus Torvalds inode->i_op = &hugetlbfs_dir_inode_operations; 7591da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* directory inodes start off with i_nlink == 2 (for "." entry) */ 762d8c76e6fSDave Hansen inc_nlink(inode); 7631da177e4SLinus Torvalds break; 7641da177e4SLinus Torvalds case S_IFLNK: 7651da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 76621fc61c7SAl Viro inode_nohighmem(inode); 7671da177e4SLinus Torvalds break; 7681da177e4SLinus Torvalds } 769e096d0c7SJosh Boyer lockdep_annotate_inode_mutex_key(inode); 7709119a41eSJoonsoo Kim } else 7719119a41eSJoonsoo Kim kref_put(&resv_map->refs, resv_map_release); 7729119a41eSJoonsoo Kim 7731da177e4SLinus Torvalds return inode; 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /* 7771da177e4SLinus Torvalds * File creation. Allocate an inode, and we're done.. 7781da177e4SLinus Torvalds */ 7791da177e4SLinus Torvalds static int hugetlbfs_mknod(struct inode *dir, 7801a67aafbSAl Viro struct dentry *dentry, umode_t mode, dev_t dev) 7811da177e4SLinus Torvalds { 7821da177e4SLinus Torvalds struct inode *inode; 7831da177e4SLinus Torvalds int error = -ENOSPC; 7841da177e4SLinus Torvalds 7857d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); 7861da177e4SLinus Torvalds if (inode) { 787078cd827SDeepa Dinamani dir->i_ctime = dir->i_mtime = current_time(dir); 7881da177e4SLinus Torvalds d_instantiate(dentry, inode); 7891da177e4SLinus Torvalds dget(dentry); /* Extra count - pin the dentry in core */ 7901da177e4SLinus Torvalds error = 0; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds return error; 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 79518bb1db3SAl Viro static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 7961da177e4SLinus Torvalds { 7971da177e4SLinus Torvalds int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); 7981da177e4SLinus Torvalds if (!retval) 799d8c76e6fSDave Hansen inc_nlink(dir); 8001da177e4SLinus Torvalds return retval; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 803ebfc3b49SAl Viro static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) 8041da177e4SLinus Torvalds { 8051da177e4SLinus Torvalds return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds static int hugetlbfs_symlink(struct inode *dir, 8091da177e4SLinus Torvalds struct dentry *dentry, const char *symname) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds struct inode *inode; 8121da177e4SLinus Torvalds int error = -ENOSPC; 8131da177e4SLinus Torvalds 8147d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); 8151da177e4SLinus Torvalds if (inode) { 8161da177e4SLinus Torvalds int l = strlen(symname)+1; 8171da177e4SLinus Torvalds error = page_symlink(inode, symname, l); 8181da177e4SLinus Torvalds if (!error) { 8191da177e4SLinus Torvalds d_instantiate(dentry, inode); 8201da177e4SLinus Torvalds dget(dentry); 8211da177e4SLinus Torvalds } else 8221da177e4SLinus Torvalds iput(inode); 8231da177e4SLinus Torvalds } 824078cd827SDeepa Dinamani dir->i_ctime = dir->i_mtime = current_time(dir); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds return error; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* 8306649a386SKen Chen * mark the head page dirty 8311da177e4SLinus Torvalds */ 8321da177e4SLinus Torvalds static int hugetlbfs_set_page_dirty(struct page *page) 8331da177e4SLinus Torvalds { 834d85f3385SChristoph Lameter struct page *head = compound_head(page); 8356649a386SKen Chen 8366649a386SKen Chen SetPageDirty(head); 8371da177e4SLinus Torvalds return 0; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds 840290408d4SNaoya Horiguchi static int hugetlbfs_migrate_page(struct address_space *mapping, 841b969c4abSMel Gorman struct page *newpage, struct page *page, 842a6bc32b8SMel Gorman enum migrate_mode mode) 843290408d4SNaoya Horiguchi { 844290408d4SNaoya Horiguchi int rc; 845290408d4SNaoya Horiguchi 846290408d4SNaoya Horiguchi rc = migrate_huge_page_move_mapping(mapping, newpage, page); 84778bd5209SRafael Aquini if (rc != MIGRATEPAGE_SUCCESS) 848290408d4SNaoya Horiguchi return rc; 849290408d4SNaoya Horiguchi migrate_page_copy(newpage, page); 850290408d4SNaoya Horiguchi 85178bd5209SRafael Aquini return MIGRATEPAGE_SUCCESS; 852290408d4SNaoya Horiguchi } 853290408d4SNaoya Horiguchi 8544a25220dSDavid Howells /* 8554a25220dSDavid Howells * Display the mount options in /proc/mounts. 8564a25220dSDavid Howells */ 8574a25220dSDavid Howells static int hugetlbfs_show_options(struct seq_file *m, struct dentry *root) 8584a25220dSDavid Howells { 8594a25220dSDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(root->d_sb); 8604a25220dSDavid Howells struct hugepage_subpool *spool = sbinfo->spool; 8614a25220dSDavid Howells unsigned long hpage_size = huge_page_size(sbinfo->hstate); 8624a25220dSDavid Howells unsigned hpage_shift = huge_page_shift(sbinfo->hstate); 8634a25220dSDavid Howells char mod; 8644a25220dSDavid Howells 8654a25220dSDavid Howells if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) 8664a25220dSDavid Howells seq_printf(m, ",uid=%u", 8674a25220dSDavid Howells from_kuid_munged(&init_user_ns, sbinfo->uid)); 8684a25220dSDavid Howells if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) 8694a25220dSDavid Howells seq_printf(m, ",gid=%u", 8704a25220dSDavid Howells from_kgid_munged(&init_user_ns, sbinfo->gid)); 8714a25220dSDavid Howells if (sbinfo->mode != 0755) 8724a25220dSDavid Howells seq_printf(m, ",mode=%o", sbinfo->mode); 8734a25220dSDavid Howells if (sbinfo->max_inodes != -1) 8744a25220dSDavid Howells seq_printf(m, ",nr_inodes=%lu", sbinfo->max_inodes); 8754a25220dSDavid Howells 8764a25220dSDavid Howells hpage_size /= 1024; 8774a25220dSDavid Howells mod = 'K'; 8784a25220dSDavid Howells if (hpage_size >= 1024) { 8794a25220dSDavid Howells hpage_size /= 1024; 8804a25220dSDavid Howells mod = 'M'; 8814a25220dSDavid Howells } 8824a25220dSDavid Howells seq_printf(m, ",pagesize=%lu%c", hpage_size, mod); 8834a25220dSDavid Howells if (spool) { 8844a25220dSDavid Howells if (spool->max_hpages != -1) 8854a25220dSDavid Howells seq_printf(m, ",size=%llu", 8864a25220dSDavid Howells (unsigned long long)spool->max_hpages << hpage_shift); 8874a25220dSDavid Howells if (spool->min_hpages != -1) 8884a25220dSDavid Howells seq_printf(m, ",min_size=%llu", 8894a25220dSDavid Howells (unsigned long long)spool->min_hpages << hpage_shift); 8904a25220dSDavid Howells } 8914a25220dSDavid Howells return 0; 8924a25220dSDavid Howells } 8934a25220dSDavid Howells 894726c3342SDavid Howells static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) 8951da177e4SLinus Torvalds { 896726c3342SDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); 8972b0143b5SDavid Howells struct hstate *h = hstate_inode(d_inode(dentry)); 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds buf->f_type = HUGETLBFS_MAGIC; 900a5516438SAndi Kleen buf->f_bsize = huge_page_size(h); 9011da177e4SLinus Torvalds if (sbinfo) { 9021da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 90374a8a65cSDavid Gibson /* If no limits set, just report 0 for max/free/used 90474a8a65cSDavid Gibson * blocks, like simple_statfs() */ 90590481622SDavid Gibson if (sbinfo->spool) { 90690481622SDavid Gibson long free_pages; 90790481622SDavid Gibson 90890481622SDavid Gibson spin_lock(&sbinfo->spool->lock); 90990481622SDavid Gibson buf->f_blocks = sbinfo->spool->max_hpages; 91090481622SDavid Gibson free_pages = sbinfo->spool->max_hpages 91190481622SDavid Gibson - sbinfo->spool->used_hpages; 91290481622SDavid Gibson buf->f_bavail = buf->f_bfree = free_pages; 91390481622SDavid Gibson spin_unlock(&sbinfo->spool->lock); 9141da177e4SLinus Torvalds buf->f_files = sbinfo->max_inodes; 9151da177e4SLinus Torvalds buf->f_ffree = sbinfo->free_inodes; 91674a8a65cSDavid Gibson } 9171da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds buf->f_namelen = NAME_MAX; 9201da177e4SLinus Torvalds return 0; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds static void hugetlbfs_put_super(struct super_block *sb) 9241da177e4SLinus Torvalds { 9251da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds if (sbi) { 9281da177e4SLinus Torvalds sb->s_fs_info = NULL; 92990481622SDavid Gibson 93090481622SDavid Gibson if (sbi->spool) 93190481622SDavid Gibson hugepage_put_subpool(sbi->spool); 93290481622SDavid Gibson 9331da177e4SLinus Torvalds kfree(sbi); 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds } 9361da177e4SLinus Torvalds 93796527980SChristoph Hellwig static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) 93896527980SChristoph Hellwig { 93996527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 94096527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 94196527980SChristoph Hellwig if (unlikely(!sbinfo->free_inodes)) { 94296527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 94396527980SChristoph Hellwig return 0; 94496527980SChristoph Hellwig } 94596527980SChristoph Hellwig sbinfo->free_inodes--; 94696527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 94796527980SChristoph Hellwig } 94896527980SChristoph Hellwig 94996527980SChristoph Hellwig return 1; 95096527980SChristoph Hellwig } 95196527980SChristoph Hellwig 95296527980SChristoph Hellwig static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) 95396527980SChristoph Hellwig { 95496527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 95596527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 95696527980SChristoph Hellwig sbinfo->free_inodes++; 95796527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 95896527980SChristoph Hellwig } 95996527980SChristoph Hellwig } 96096527980SChristoph Hellwig 96196527980SChristoph Hellwig 962e18b890bSChristoph Lameter static struct kmem_cache *hugetlbfs_inode_cachep; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) 9651da177e4SLinus Torvalds { 96696527980SChristoph Hellwig struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); 9671da177e4SLinus Torvalds struct hugetlbfs_inode_info *p; 9681da177e4SLinus Torvalds 96996527980SChristoph Hellwig if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) 9701da177e4SLinus Torvalds return NULL; 971e94b1766SChristoph Lameter p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); 97296527980SChristoph Hellwig if (unlikely(!p)) { 97396527980SChristoph Hellwig hugetlbfs_inc_free_inodes(sbinfo); 97496527980SChristoph Hellwig return NULL; 9751da177e4SLinus Torvalds } 9764742a35dSMike Kravetz 9774742a35dSMike Kravetz /* 9784742a35dSMike Kravetz * Any time after allocation, hugetlbfs_destroy_inode can be called 9794742a35dSMike Kravetz * for the inode. mpol_free_shared_policy is unconditionally called 9804742a35dSMike Kravetz * as part of hugetlbfs_destroy_inode. So, initialize policy here 9814742a35dSMike Kravetz * in case of a quick call to destroy. 9824742a35dSMike Kravetz * 9834742a35dSMike Kravetz * Note that the policy is initialized even if we are creating a 9844742a35dSMike Kravetz * private inode. This simplifies hugetlbfs_destroy_inode. 9854742a35dSMike Kravetz */ 9864742a35dSMike Kravetz mpol_shared_policy_init(&p->policy, NULL); 9874742a35dSMike Kravetz 98896527980SChristoph Hellwig return &p->vfs_inode; 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 991fa0d7e3dSNick Piggin static void hugetlbfs_i_callback(struct rcu_head *head) 992fa0d7e3dSNick Piggin { 993fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 994fa0d7e3dSNick Piggin kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); 995fa0d7e3dSNick Piggin } 996fa0d7e3dSNick Piggin 9971da177e4SLinus Torvalds static void hugetlbfs_destroy_inode(struct inode *inode) 9981da177e4SLinus Torvalds { 99996527980SChristoph Hellwig hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); 10001da177e4SLinus Torvalds mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); 1001fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, hugetlbfs_i_callback); 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds 1004f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops = { 1005800d15a5SNick Piggin .write_begin = hugetlbfs_write_begin, 1006800d15a5SNick Piggin .write_end = hugetlbfs_write_end, 10071da177e4SLinus Torvalds .set_page_dirty = hugetlbfs_set_page_dirty, 1008290408d4SNaoya Horiguchi .migratepage = hugetlbfs_migrate_page, 10091da177e4SLinus Torvalds }; 10101da177e4SLinus Torvalds 101196527980SChristoph Hellwig 101251cc5068SAlexey Dobriyan static void init_once(void *foo) 101396527980SChristoph Hellwig { 101496527980SChristoph Hellwig struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; 101596527980SChristoph Hellwig 101696527980SChristoph Hellwig inode_init_once(&ei->vfs_inode); 101796527980SChristoph Hellwig } 101896527980SChristoph Hellwig 10194b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations = { 102034d0640eSAl Viro .read_iter = hugetlbfs_read_iter, 10211da177e4SLinus Torvalds .mmap = hugetlbfs_file_mmap, 10221b061d92SChristoph Hellwig .fsync = noop_fsync, 10231da177e4SLinus Torvalds .get_unmapped_area = hugetlb_get_unmapped_area, 10246038f373SArnd Bergmann .llseek = default_llseek, 102570c3547eSMike Kravetz .fallocate = hugetlbfs_fallocate, 10261da177e4SLinus Torvalds }; 10271da177e4SLinus Torvalds 102892e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations = { 10291da177e4SLinus Torvalds .create = hugetlbfs_create, 10301da177e4SLinus Torvalds .lookup = simple_lookup, 10311da177e4SLinus Torvalds .link = simple_link, 10321da177e4SLinus Torvalds .unlink = simple_unlink, 10331da177e4SLinus Torvalds .symlink = hugetlbfs_symlink, 10341da177e4SLinus Torvalds .mkdir = hugetlbfs_mkdir, 10351da177e4SLinus Torvalds .rmdir = simple_rmdir, 10361da177e4SLinus Torvalds .mknod = hugetlbfs_mknod, 10371da177e4SLinus Torvalds .rename = simple_rename, 10381da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 10391da177e4SLinus Torvalds }; 10401da177e4SLinus Torvalds 104192e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations = { 10421da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 10431da177e4SLinus Torvalds }; 10441da177e4SLinus Torvalds 1045ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops = { 10461da177e4SLinus Torvalds .alloc_inode = hugetlbfs_alloc_inode, 10471da177e4SLinus Torvalds .destroy_inode = hugetlbfs_destroy_inode, 10482bbbda30SAl Viro .evict_inode = hugetlbfs_evict_inode, 10491da177e4SLinus Torvalds .statfs = hugetlbfs_statfs, 10501da177e4SLinus Torvalds .put_super = hugetlbfs_put_super, 10514a25220dSDavid Howells .show_options = hugetlbfs_show_options, 10521da177e4SLinus Torvalds }; 10531da177e4SLinus Torvalds 10544a25220dSDavid Howells enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT }; 10557ca02d0aSMike Kravetz 10567ca02d0aSMike Kravetz /* 10577ca02d0aSMike Kravetz * Convert size option passed from command line to number of huge pages 10587ca02d0aSMike Kravetz * in the pool specified by hstate. Size option could be in bytes 10597ca02d0aSMike Kravetz * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT). 10607ca02d0aSMike Kravetz */ 10614a25220dSDavid Howells static long 10627ca02d0aSMike Kravetz hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt, 10634a25220dSDavid Howells enum hugetlbfs_size_type val_type) 10647ca02d0aSMike Kravetz { 10657ca02d0aSMike Kravetz if (val_type == NO_SIZE) 10667ca02d0aSMike Kravetz return -1; 10677ca02d0aSMike Kravetz 10687ca02d0aSMike Kravetz if (val_type == SIZE_PERCENT) { 10697ca02d0aSMike Kravetz size_opt <<= huge_page_shift(h); 10707ca02d0aSMike Kravetz size_opt *= h->max_huge_pages; 10717ca02d0aSMike Kravetz do_div(size_opt, 100); 10727ca02d0aSMike Kravetz } 10737ca02d0aSMike Kravetz 10747ca02d0aSMike Kravetz size_opt >>= huge_page_shift(h); 10757ca02d0aSMike Kravetz return size_opt; 10767ca02d0aSMike Kravetz } 10777ca02d0aSMike Kravetz 10781da177e4SLinus Torvalds static int 10791da177e4SLinus Torvalds hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 10801da177e4SLinus Torvalds { 1081e73a75faSRandy Dunlap char *p, *rest; 1082e73a75faSRandy Dunlap substring_t args[MAX_OPT_ARGS]; 1083e73a75faSRandy Dunlap int option; 10847ca02d0aSMike Kravetz unsigned long long max_size_opt = 0, min_size_opt = 0; 10854a25220dSDavid Howells enum hugetlbfs_size_type max_val_type = NO_SIZE, min_val_type = NO_SIZE; 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds if (!options) 10881da177e4SLinus Torvalds return 0; 10891da177e4SLinus Torvalds 1090e73a75faSRandy Dunlap while ((p = strsep(&options, ",")) != NULL) { 1091e73a75faSRandy Dunlap int token; 1092b4c07bceSLee Schermerhorn if (!*p) 1093b4c07bceSLee Schermerhorn continue; 10941da177e4SLinus Torvalds 1095e73a75faSRandy Dunlap token = match_token(p, tokens, args); 1096e73a75faSRandy Dunlap switch (token) { 1097e73a75faSRandy Dunlap case Opt_uid: 1098e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 1099e73a75faSRandy Dunlap goto bad_val; 1100a0eb3a05SEric W. Biederman pconfig->uid = make_kuid(current_user_ns(), option); 1101a0eb3a05SEric W. Biederman if (!uid_valid(pconfig->uid)) 1102a0eb3a05SEric W. Biederman goto bad_val; 1103e73a75faSRandy Dunlap break; 1104e73a75faSRandy Dunlap 1105e73a75faSRandy Dunlap case Opt_gid: 1106e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 1107e73a75faSRandy Dunlap goto bad_val; 1108a0eb3a05SEric W. Biederman pconfig->gid = make_kgid(current_user_ns(), option); 1109a0eb3a05SEric W. Biederman if (!gid_valid(pconfig->gid)) 1110a0eb3a05SEric W. Biederman goto bad_val; 1111e73a75faSRandy Dunlap break; 1112e73a75faSRandy Dunlap 1113e73a75faSRandy Dunlap case Opt_mode: 1114e73a75faSRandy Dunlap if (match_octal(&args[0], &option)) 1115e73a75faSRandy Dunlap goto bad_val; 111675897d60SKen Chen pconfig->mode = option & 01777U; 1117e73a75faSRandy Dunlap break; 1118e73a75faSRandy Dunlap 1119e73a75faSRandy Dunlap case Opt_size: { 1120e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 1121e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 1122e73a75faSRandy Dunlap goto bad_val; 11237ca02d0aSMike Kravetz max_size_opt = memparse(args[0].from, &rest); 11247ca02d0aSMike Kravetz max_val_type = SIZE_STD; 1125a137e1ccSAndi Kleen if (*rest == '%') 11267ca02d0aSMike Kravetz max_val_type = SIZE_PERCENT; 1127e73a75faSRandy Dunlap break; 1128e73a75faSRandy Dunlap } 11291da177e4SLinus Torvalds 1130e73a75faSRandy Dunlap case Opt_nr_inodes: 1131e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 1132e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 1133e73a75faSRandy Dunlap goto bad_val; 1134e73a75faSRandy Dunlap pconfig->nr_inodes = memparse(args[0].from, &rest); 1135e73a75faSRandy Dunlap break; 1136e73a75faSRandy Dunlap 1137a137e1ccSAndi Kleen case Opt_pagesize: { 1138a137e1ccSAndi Kleen unsigned long ps; 1139a137e1ccSAndi Kleen ps = memparse(args[0].from, &rest); 1140a137e1ccSAndi Kleen pconfig->hstate = size_to_hstate(ps); 1141a137e1ccSAndi Kleen if (!pconfig->hstate) { 11429b857d26SAndrew Morton pr_err("Unsupported page size %lu MB\n", 1143a137e1ccSAndi Kleen ps >> 20); 1144a137e1ccSAndi Kleen return -EINVAL; 1145a137e1ccSAndi Kleen } 1146a137e1ccSAndi Kleen break; 1147a137e1ccSAndi Kleen } 1148a137e1ccSAndi Kleen 11497ca02d0aSMike Kravetz case Opt_min_size: { 11507ca02d0aSMike Kravetz /* memparse() will accept a K/M/G without a digit */ 11517ca02d0aSMike Kravetz if (!isdigit(*args[0].from)) 11527ca02d0aSMike Kravetz goto bad_val; 11537ca02d0aSMike Kravetz min_size_opt = memparse(args[0].from, &rest); 11547ca02d0aSMike Kravetz min_val_type = SIZE_STD; 11557ca02d0aSMike Kravetz if (*rest == '%') 11567ca02d0aSMike Kravetz min_val_type = SIZE_PERCENT; 11577ca02d0aSMike Kravetz break; 11587ca02d0aSMike Kravetz } 11597ca02d0aSMike Kravetz 1160e73a75faSRandy Dunlap default: 11619b857d26SAndrew Morton pr_err("Bad mount option: \"%s\"\n", p); 1162b4c07bceSLee Schermerhorn return -EINVAL; 1163e73a75faSRandy Dunlap break; 1164e73a75faSRandy Dunlap } 11651da177e4SLinus Torvalds } 1166a137e1ccSAndi Kleen 11677ca02d0aSMike Kravetz /* 11687ca02d0aSMike Kravetz * Use huge page pool size (in hstate) to convert the size 11697ca02d0aSMike Kravetz * options to number of huge pages. If NO_SIZE, -1 is returned. 11707ca02d0aSMike Kravetz */ 11717ca02d0aSMike Kravetz pconfig->max_hpages = hugetlbfs_size_to_hpages(pconfig->hstate, 11727ca02d0aSMike Kravetz max_size_opt, max_val_type); 11737ca02d0aSMike Kravetz pconfig->min_hpages = hugetlbfs_size_to_hpages(pconfig->hstate, 11747ca02d0aSMike Kravetz min_size_opt, min_val_type); 11757ca02d0aSMike Kravetz 11767ca02d0aSMike Kravetz /* 11777ca02d0aSMike Kravetz * If max_size was specified, then min_size must be smaller 11787ca02d0aSMike Kravetz */ 11797ca02d0aSMike Kravetz if (max_val_type > NO_SIZE && 11807ca02d0aSMike Kravetz pconfig->min_hpages > pconfig->max_hpages) { 11817ca02d0aSMike Kravetz pr_err("minimum size can not be greater than maximum size\n"); 11827ca02d0aSMike Kravetz return -EINVAL; 1183a137e1ccSAndi Kleen } 1184a137e1ccSAndi Kleen 11851da177e4SLinus Torvalds return 0; 1186e73a75faSRandy Dunlap 1187e73a75faSRandy Dunlap bad_val: 11889b857d26SAndrew Morton pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); 1189c12ddba0SAkinobu Mita return -EINVAL; 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds static int 11931da177e4SLinus Torvalds hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 11941da177e4SLinus Torvalds { 11951da177e4SLinus Torvalds int ret; 11961da177e4SLinus Torvalds struct hugetlbfs_config config; 11971da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo; 11981da177e4SLinus Torvalds 11997ca02d0aSMike Kravetz config.max_hpages = -1; /* No limit on size by default */ 12001da177e4SLinus Torvalds config.nr_inodes = -1; /* No limit on number of inodes by default */ 120177c70de1SDavid Howells config.uid = current_fsuid(); 120277c70de1SDavid Howells config.gid = current_fsgid(); 12031da177e4SLinus Torvalds config.mode = 0755; 1204a137e1ccSAndi Kleen config.hstate = &default_hstate; 12057ca02d0aSMike Kravetz config.min_hpages = -1; /* No default minimum size */ 12061da177e4SLinus Torvalds ret = hugetlbfs_parse_options(data, &config); 12071da177e4SLinus Torvalds if (ret) 12081da177e4SLinus Torvalds return ret; 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); 12111da177e4SLinus Torvalds if (!sbinfo) 12121da177e4SLinus Torvalds return -ENOMEM; 12131da177e4SLinus Torvalds sb->s_fs_info = sbinfo; 1214a137e1ccSAndi Kleen sbinfo->hstate = config.hstate; 12151da177e4SLinus Torvalds spin_lock_init(&sbinfo->stat_lock); 12161da177e4SLinus Torvalds sbinfo->max_inodes = config.nr_inodes; 12171da177e4SLinus Torvalds sbinfo->free_inodes = config.nr_inodes; 121890481622SDavid Gibson sbinfo->spool = NULL; 12194a25220dSDavid Howells sbinfo->uid = config.uid; 12204a25220dSDavid Howells sbinfo->gid = config.gid; 12214a25220dSDavid Howells sbinfo->mode = config.mode; 12224a25220dSDavid Howells 12237ca02d0aSMike Kravetz /* 12247ca02d0aSMike Kravetz * Allocate and initialize subpool if maximum or minimum size is 12257ca02d0aSMike Kravetz * specified. Any needed reservations (for minimim size) are taken 12267ca02d0aSMike Kravetz * taken when the subpool is created. 12277ca02d0aSMike Kravetz */ 12287ca02d0aSMike Kravetz if (config.max_hpages != -1 || config.min_hpages != -1) { 12297ca02d0aSMike Kravetz sbinfo->spool = hugepage_new_subpool(config.hstate, 12307ca02d0aSMike Kravetz config.max_hpages, 12317ca02d0aSMike Kravetz config.min_hpages); 123290481622SDavid Gibson if (!sbinfo->spool) 123390481622SDavid Gibson goto out_free; 123490481622SDavid Gibson } 12351da177e4SLinus Torvalds sb->s_maxbytes = MAX_LFS_FILESIZE; 1236a137e1ccSAndi Kleen sb->s_blocksize = huge_page_size(config.hstate); 1237a137e1ccSAndi Kleen sb->s_blocksize_bits = huge_page_shift(config.hstate); 12381da177e4SLinus Torvalds sb->s_magic = HUGETLBFS_MAGIC; 12391da177e4SLinus Torvalds sb->s_op = &hugetlbfs_ops; 12401da177e4SLinus Torvalds sb->s_time_gran = 1; 124148fde701SAl Viro sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); 124248fde701SAl Viro if (!sb->s_root) 12431da177e4SLinus Torvalds goto out_free; 12441da177e4SLinus Torvalds return 0; 12451da177e4SLinus Torvalds out_free: 124690481622SDavid Gibson kfree(sbinfo->spool); 12471da177e4SLinus Torvalds kfree(sbinfo); 12481da177e4SLinus Torvalds return -ENOMEM; 12491da177e4SLinus Torvalds } 12501da177e4SLinus Torvalds 12513c26ff6eSAl Viro static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, 12523c26ff6eSAl Viro int flags, const char *dev_name, void *data) 12531da177e4SLinus Torvalds { 12543c26ff6eSAl Viro return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); 12551da177e4SLinus Torvalds } 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds static struct file_system_type hugetlbfs_fs_type = { 12581da177e4SLinus Torvalds .name = "hugetlbfs", 12593c26ff6eSAl Viro .mount = hugetlbfs_mount, 12601da177e4SLinus Torvalds .kill_sb = kill_litter_super, 12611da177e4SLinus Torvalds }; 12621da177e4SLinus Torvalds 126342d7395fSAndi Kleen static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; 12641da177e4SLinus Torvalds 1265ef1ff6b8SFrom: Mel Gorman static int can_do_hugetlb_shm(void) 12661da177e4SLinus Torvalds { 1267a0eb3a05SEric W. Biederman kgid_t shm_group; 1268a0eb3a05SEric W. Biederman shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); 1269a0eb3a05SEric W. Biederman return capable(CAP_IPC_LOCK) || in_group_p(shm_group); 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds 127242d7395fSAndi Kleen static int get_hstate_idx(int page_size_log) 127342d7395fSAndi Kleen { 1274af73e4d9SNaoya Horiguchi struct hstate *h = hstate_sizelog(page_size_log); 127542d7395fSAndi Kleen 127642d7395fSAndi Kleen if (!h) 127742d7395fSAndi Kleen return -1; 127842d7395fSAndi Kleen return h - hstates; 127942d7395fSAndi Kleen } 128042d7395fSAndi Kleen 1281be1d2cf5SFabian Frederick static const struct dentry_operations anon_ops = { 1282118b2302SAl Viro .d_dname = simple_dname 12830df4d6e5SAl Viro }; 12840df4d6e5SAl Viro 1285af73e4d9SNaoya Horiguchi /* 1286af73e4d9SNaoya Horiguchi * Note that size should be aligned to proper hugepage size in caller side, 1287af73e4d9SNaoya Horiguchi * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. 1288af73e4d9SNaoya Horiguchi */ 1289af73e4d9SNaoya Horiguchi struct file *hugetlb_file_setup(const char *name, size_t size, 1290af73e4d9SNaoya Horiguchi vm_flags_t acctflag, struct user_struct **user, 129142d7395fSAndi Kleen int creat_flags, int page_size_log) 12921da177e4SLinus Torvalds { 129339b65252SAnatol Pomozov struct file *file = ERR_PTR(-ENOMEM); 12941da177e4SLinus Torvalds struct inode *inode; 12952c48b9c4SAl Viro struct path path; 12960df4d6e5SAl Viro struct super_block *sb; 12971da177e4SLinus Torvalds struct qstr quick_string; 129842d7395fSAndi Kleen int hstate_idx; 129942d7395fSAndi Kleen 130042d7395fSAndi Kleen hstate_idx = get_hstate_idx(page_size_log); 130142d7395fSAndi Kleen if (hstate_idx < 0) 130242d7395fSAndi Kleen return ERR_PTR(-ENODEV); 13031da177e4SLinus Torvalds 1304353d5c30SHugh Dickins *user = NULL; 130542d7395fSAndi Kleen if (!hugetlbfs_vfsmount[hstate_idx]) 13065bc98594SAkinobu Mita return ERR_PTR(-ENOENT); 13075bc98594SAkinobu Mita 1308ef1ff6b8SFrom: Mel Gorman if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { 1309353d5c30SHugh Dickins *user = current_user(); 1310353d5c30SHugh Dickins if (user_shm_lock(size, *user)) { 131121a3c273SDavid Rientjes task_lock(current); 13129b857d26SAndrew Morton pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", 131321a3c273SDavid Rientjes current->comm, current->pid); 131421a3c273SDavid Rientjes task_unlock(current); 1315353d5c30SHugh Dickins } else { 1316353d5c30SHugh Dickins *user = NULL; 13171da177e4SLinus Torvalds return ERR_PTR(-EPERM); 13182584e517SRavikiran G Thirumalai } 1319353d5c30SHugh Dickins } 13201da177e4SLinus Torvalds 13210df4d6e5SAl Viro sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; 13229d66586fSEric W. Biederman quick_string.name = name; 13231da177e4SLinus Torvalds quick_string.len = strlen(quick_string.name); 13241da177e4SLinus Torvalds quick_string.hash = 0; 13250df4d6e5SAl Viro path.dentry = d_alloc_pseudo(sb, &quick_string); 13262c48b9c4SAl Viro if (!path.dentry) 13271da177e4SLinus Torvalds goto out_shm_unlock; 13281da177e4SLinus Torvalds 13290df4d6e5SAl Viro d_set_d_op(path.dentry, &anon_ops); 133042d7395fSAndi Kleen path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); 133139b65252SAnatol Pomozov file = ERR_PTR(-ENOSPC); 13320df4d6e5SAl Viro inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); 13331da177e4SLinus Torvalds if (!inode) 1334ce8d2cdfSDave Hansen goto out_dentry; 1335e1832f29SStephen Smalley if (creat_flags == HUGETLB_SHMFS_INODE) 1336e1832f29SStephen Smalley inode->i_flags |= S_PRIVATE; 13371da177e4SLinus Torvalds 133839b65252SAnatol Pomozov file = ERR_PTR(-ENOMEM); 1339af73e4d9SNaoya Horiguchi if (hugetlb_reserve_pages(inode, 0, 1340af73e4d9SNaoya Horiguchi size >> huge_page_shift(hstate_inode(inode)), NULL, 1341af73e4d9SNaoya Horiguchi acctflag)) 1342b45b5bd6SDavid Gibson goto out_inode; 1343b45b5bd6SDavid Gibson 13442c48b9c4SAl Viro d_instantiate(path.dentry, inode); 13451da177e4SLinus Torvalds inode->i_size = size; 13466d6b77f1SMiklos Szeredi clear_nlink(inode); 1347ce8d2cdfSDave Hansen 13482c48b9c4SAl Viro file = alloc_file(&path, FMODE_WRITE | FMODE_READ, 1349ce8d2cdfSDave Hansen &hugetlbfs_file_operations); 135039b65252SAnatol Pomozov if (IS_ERR(file)) 1351b4d232e6SAl Viro goto out_dentry; /* inode is already attached */ 1352ce8d2cdfSDave Hansen 13531da177e4SLinus Torvalds return file; 13541da177e4SLinus Torvalds 1355b45b5bd6SDavid Gibson out_inode: 1356b45b5bd6SDavid Gibson iput(inode); 13571da177e4SLinus Torvalds out_dentry: 13582c48b9c4SAl Viro path_put(&path); 13591da177e4SLinus Torvalds out_shm_unlock: 1360353d5c30SHugh Dickins if (*user) { 1361353d5c30SHugh Dickins user_shm_unlock(size, *user); 1362353d5c30SHugh Dickins *user = NULL; 1363353d5c30SHugh Dickins } 136439b65252SAnatol Pomozov return file; 13651da177e4SLinus Torvalds } 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds static int __init init_hugetlbfs_fs(void) 13681da177e4SLinus Torvalds { 136942d7395fSAndi Kleen struct hstate *h; 13701da177e4SLinus Torvalds int error; 137142d7395fSAndi Kleen int i; 13721da177e4SLinus Torvalds 1373457c1b27SNishanth Aravamudan if (!hugepages_supported()) { 13749b857d26SAndrew Morton pr_info("disabling because there are no supported hugepage sizes\n"); 1375457c1b27SNishanth Aravamudan return -ENOTSUPP; 1376457c1b27SNishanth Aravamudan } 1377457c1b27SNishanth Aravamudan 1378d1d5e05fSHillf Danton error = -ENOMEM; 13791da177e4SLinus Torvalds hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", 13801da177e4SLinus Torvalds sizeof(struct hugetlbfs_inode_info), 13815d097056SVladimir Davydov 0, SLAB_ACCOUNT, init_once); 13821da177e4SLinus Torvalds if (hugetlbfs_inode_cachep == NULL) 1383e0bf68ddSPeter Zijlstra goto out2; 13841da177e4SLinus Torvalds 13851da177e4SLinus Torvalds error = register_filesystem(&hugetlbfs_fs_type); 13861da177e4SLinus Torvalds if (error) 13871da177e4SLinus Torvalds goto out; 13881da177e4SLinus Torvalds 138942d7395fSAndi Kleen i = 0; 139042d7395fSAndi Kleen for_each_hstate(h) { 139142d7395fSAndi Kleen char buf[50]; 139242d7395fSAndi Kleen unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); 13931da177e4SLinus Torvalds 139442d7395fSAndi Kleen snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); 139542d7395fSAndi Kleen hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, 139642d7395fSAndi Kleen buf); 139742d7395fSAndi Kleen 139842d7395fSAndi Kleen if (IS_ERR(hugetlbfs_vfsmount[i])) { 13999b857d26SAndrew Morton pr_err("Cannot mount internal hugetlbfs for " 140042d7395fSAndi Kleen "page size %uK", ps_kb); 140142d7395fSAndi Kleen error = PTR_ERR(hugetlbfs_vfsmount[i]); 140242d7395fSAndi Kleen hugetlbfs_vfsmount[i] = NULL; 14031da177e4SLinus Torvalds } 140442d7395fSAndi Kleen i++; 140542d7395fSAndi Kleen } 140642d7395fSAndi Kleen /* Non default hstates are optional */ 140742d7395fSAndi Kleen if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) 140842d7395fSAndi Kleen return 0; 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds out: 14111da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 1412e0bf68ddSPeter Zijlstra out2: 14131da177e4SLinus Torvalds return error; 14141da177e4SLinus Torvalds } 14153e89e1c5SPaul Gortmaker fs_initcall(init_hugetlbfs_fs) 1416