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. 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 99b857d26SAndrew Morton #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 109b857d26SAndrew Morton 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/thread_info.h> 131da177e4SLinus Torvalds #include <asm/current.h> 141da177e4SLinus Torvalds #include <linux/sched.h> /* remove ASAP */ 151da177e4SLinus Torvalds #include <linux/fs.h> 161da177e4SLinus Torvalds #include <linux/mount.h> 171da177e4SLinus Torvalds #include <linux/file.h> 18e73a75faSRandy Dunlap #include <linux/kernel.h> 191da177e4SLinus Torvalds #include <linux/writeback.h> 201da177e4SLinus Torvalds #include <linux/pagemap.h> 211da177e4SLinus Torvalds #include <linux/highmem.h> 221da177e4SLinus Torvalds #include <linux/init.h> 231da177e4SLinus Torvalds #include <linux/string.h> 2416f7e0feSRandy Dunlap #include <linux/capability.h> 25e73a75faSRandy Dunlap #include <linux/ctype.h> 261da177e4SLinus Torvalds #include <linux/backing-dev.h> 271da177e4SLinus Torvalds #include <linux/hugetlb.h> 281da177e4SLinus Torvalds #include <linux/pagevec.h> 29e73a75faSRandy Dunlap #include <linux/parser.h> 30036e0856SBenjamin Herrenschmidt #include <linux/mman.h> 311da177e4SLinus Torvalds #include <linux/slab.h> 321da177e4SLinus Torvalds #include <linux/dnotify.h> 331da177e4SLinus Torvalds #include <linux/statfs.h> 341da177e4SLinus Torvalds #include <linux/security.h> 351fd7317dSNick Black #include <linux/magic.h> 36290408d4SNaoya Horiguchi #include <linux/migrate.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #include <asm/uaccess.h> 391da177e4SLinus Torvalds 40ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops; 41f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops; 424b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations; 4392e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations; 4492e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations; 451da177e4SLinus Torvalds 46a1d776eeSDavid Gibson struct hugetlbfs_config { 47a0eb3a05SEric W. Biederman kuid_t uid; 48a0eb3a05SEric W. Biederman kgid_t gid; 49a1d776eeSDavid Gibson umode_t mode; 50a1d776eeSDavid Gibson long nr_blocks; 51a1d776eeSDavid Gibson long nr_inodes; 52a1d776eeSDavid Gibson struct hstate *hstate; 53a1d776eeSDavid Gibson }; 54a1d776eeSDavid Gibson 55a1d776eeSDavid Gibson struct hugetlbfs_inode_info { 56a1d776eeSDavid Gibson struct shared_policy policy; 57a1d776eeSDavid Gibson struct inode vfs_inode; 58a1d776eeSDavid Gibson }; 59a1d776eeSDavid Gibson 60a1d776eeSDavid Gibson static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 61a1d776eeSDavid Gibson { 62a1d776eeSDavid Gibson return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 63a1d776eeSDavid Gibson } 64a1d776eeSDavid Gibson 651da177e4SLinus Torvalds static struct backing_dev_info hugetlbfs_backing_dev_info = { 66d993831fSJens Axboe .name = "hugetlbfs", 671da177e4SLinus Torvalds .ra_pages = 0, /* No readahead */ 68e4ad08feSMiklos Szeredi .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, 691da177e4SLinus Torvalds }; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds int sysctl_hugetlb_shm_group; 721da177e4SLinus Torvalds 73e73a75faSRandy Dunlap enum { 74e73a75faSRandy Dunlap Opt_size, Opt_nr_inodes, 75e73a75faSRandy Dunlap Opt_mode, Opt_uid, Opt_gid, 76a137e1ccSAndi Kleen Opt_pagesize, 77e73a75faSRandy Dunlap Opt_err, 78e73a75faSRandy Dunlap }; 79e73a75faSRandy Dunlap 80a447c093SSteven Whitehouse static const match_table_t tokens = { 81e73a75faSRandy Dunlap {Opt_size, "size=%s"}, 82e73a75faSRandy Dunlap {Opt_nr_inodes, "nr_inodes=%s"}, 83e73a75faSRandy Dunlap {Opt_mode, "mode=%o"}, 84e73a75faSRandy Dunlap {Opt_uid, "uid=%u"}, 85e73a75faSRandy Dunlap {Opt_gid, "gid=%u"}, 86a137e1ccSAndi Kleen {Opt_pagesize, "pagesize=%s"}, 87e73a75faSRandy Dunlap {Opt_err, NULL}, 88e73a75faSRandy Dunlap }; 89e73a75faSRandy Dunlap 902e9b367cSAdam Litke static void huge_pagevec_release(struct pagevec *pvec) 912e9b367cSAdam Litke { 922e9b367cSAdam Litke int i; 932e9b367cSAdam Litke 942e9b367cSAdam Litke for (i = 0; i < pagevec_count(pvec); ++i) 952e9b367cSAdam Litke put_page(pvec->pages[i]); 962e9b367cSAdam Litke 972e9b367cSAdam Litke pagevec_reinit(pvec); 982e9b367cSAdam Litke } 992e9b367cSAdam Litke 1001da177e4SLinus Torvalds static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) 1011da177e4SLinus Torvalds { 102496ad9aaSAl Viro struct inode *inode = file_inode(file); 1031da177e4SLinus Torvalds loff_t len, vma_len; 1041da177e4SLinus Torvalds int ret; 105a5516438SAndi Kleen struct hstate *h = hstate_file(file); 1061da177e4SLinus Torvalds 10768589bc3SHugh Dickins /* 108dec4ad86SDavid Gibson * vma address alignment (but not the pgoff alignment) has 109dec4ad86SDavid Gibson * already been checked by prepare_hugepage_range. If you add 110dec4ad86SDavid Gibson * any error returns here, do so after setting VM_HUGETLB, so 111dec4ad86SDavid Gibson * is_vm_hugetlb_page tests below unmap_region go the right 112dec4ad86SDavid Gibson * way when do_mmap_pgoff unwinds (may be important on powerpc 113dec4ad86SDavid Gibson * and ia64). 11468589bc3SHugh Dickins */ 115a2fce914SNaoya Horiguchi vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; 11668589bc3SHugh Dickins vma->vm_ops = &hugetlb_vm_ops; 1171da177e4SLinus Torvalds 1182b37c35eSBecky Bruce if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) 119dec4ad86SDavid Gibson return -EINVAL; 120dec4ad86SDavid Gibson 1211da177e4SLinus Torvalds vma_len = (loff_t)(vma->vm_end - vma->vm_start); 1221da177e4SLinus Torvalds 1231b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1241da177e4SLinus Torvalds file_accessed(file); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds ret = -ENOMEM; 1271da177e4SLinus Torvalds len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 1281da177e4SLinus Torvalds 129a1e78772SMel Gorman if (hugetlb_reserve_pages(inode, 130a5516438SAndi Kleen vma->vm_pgoff >> huge_page_order(h), 1315a6fe125SMel Gorman len >> huge_page_shift(h), vma, 1325a6fe125SMel Gorman vma->vm_flags)) 133b45b5bd6SDavid Gibson goto out; 134b45b5bd6SDavid Gibson 1354c887265SAdam Litke ret = 0; 1364c887265SAdam Litke hugetlb_prefault_arch_hook(vma->vm_mm); 137b6174df5SZhang, Yanmin if (vma->vm_flags & VM_WRITE && inode->i_size < len) 1381da177e4SLinus Torvalds inode->i_size = len; 1391da177e4SLinus Torvalds out: 1401b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds return ret; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* 146508034a3SHugh Dickins * Called under down_write(mmap_sem). 1471da177e4SLinus Torvalds */ 1481da177e4SLinus Torvalds 149d2ba27e8SAdrian Bunk #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 1501da177e4SLinus Torvalds static unsigned long 1511da177e4SLinus Torvalds hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 1521da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, unsigned long flags) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds struct mm_struct *mm = current->mm; 1551da177e4SLinus Torvalds struct vm_area_struct *vma; 156a5516438SAndi Kleen struct hstate *h = hstate_file(file); 15708659355SMichel Lespinasse struct vm_unmapped_area_info info; 1581da177e4SLinus Torvalds 159a5516438SAndi Kleen if (len & ~huge_page_mask(h)) 1601da177e4SLinus Torvalds return -EINVAL; 1611da177e4SLinus Torvalds if (len > TASK_SIZE) 1621da177e4SLinus Torvalds return -ENOMEM; 1631da177e4SLinus Torvalds 164036e0856SBenjamin Herrenschmidt if (flags & MAP_FIXED) { 165a5516438SAndi Kleen if (prepare_hugepage_range(file, addr, len)) 166036e0856SBenjamin Herrenschmidt return -EINVAL; 167036e0856SBenjamin Herrenschmidt return addr; 168036e0856SBenjamin Herrenschmidt } 169036e0856SBenjamin Herrenschmidt 1701da177e4SLinus Torvalds if (addr) { 171a5516438SAndi Kleen addr = ALIGN(addr, huge_page_size(h)); 1721da177e4SLinus Torvalds vma = find_vma(mm, addr); 1731da177e4SLinus Torvalds if (TASK_SIZE - len >= addr && 1741da177e4SLinus Torvalds (!vma || addr + len <= vma->vm_start)) 1751da177e4SLinus Torvalds return addr; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 17808659355SMichel Lespinasse info.flags = 0; 17908659355SMichel Lespinasse info.length = len; 18008659355SMichel Lespinasse info.low_limit = TASK_UNMAPPED_BASE; 18108659355SMichel Lespinasse info.high_limit = TASK_SIZE; 18208659355SMichel Lespinasse info.align_mask = PAGE_MASK & ~huge_page_mask(h); 18308659355SMichel Lespinasse info.align_offset = 0; 18408659355SMichel Lespinasse return vm_unmapped_area(&info); 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds #endif 1871da177e4SLinus Torvalds 188e63e1e5aSBadari Pulavarty static int 189e63e1e5aSBadari Pulavarty hugetlbfs_read_actor(struct page *page, unsigned long offset, 190e63e1e5aSBadari Pulavarty char __user *buf, unsigned long count, 191e63e1e5aSBadari Pulavarty unsigned long size) 192e63e1e5aSBadari Pulavarty { 193e63e1e5aSBadari Pulavarty char *kaddr; 194e63e1e5aSBadari Pulavarty unsigned long left, copied = 0; 195e63e1e5aSBadari Pulavarty int i, chunksize; 196e63e1e5aSBadari Pulavarty 197e63e1e5aSBadari Pulavarty if (size > count) 198e63e1e5aSBadari Pulavarty size = count; 199e63e1e5aSBadari Pulavarty 200e63e1e5aSBadari Pulavarty /* Find which 4k chunk and offset with in that chunk */ 201e63e1e5aSBadari Pulavarty i = offset >> PAGE_CACHE_SHIFT; 202e63e1e5aSBadari Pulavarty offset = offset & ~PAGE_CACHE_MASK; 203e63e1e5aSBadari Pulavarty 204e63e1e5aSBadari Pulavarty while (size) { 205e63e1e5aSBadari Pulavarty chunksize = PAGE_CACHE_SIZE; 206e63e1e5aSBadari Pulavarty if (offset) 207e63e1e5aSBadari Pulavarty chunksize -= offset; 208e63e1e5aSBadari Pulavarty if (chunksize > size) 209e63e1e5aSBadari Pulavarty chunksize = size; 210e63e1e5aSBadari Pulavarty kaddr = kmap(&page[i]); 211e63e1e5aSBadari Pulavarty left = __copy_to_user(buf, kaddr + offset, chunksize); 212e63e1e5aSBadari Pulavarty kunmap(&page[i]); 213e63e1e5aSBadari Pulavarty if (left) { 214e63e1e5aSBadari Pulavarty copied += (chunksize - left); 215e63e1e5aSBadari Pulavarty break; 216e63e1e5aSBadari Pulavarty } 217e63e1e5aSBadari Pulavarty offset = 0; 218e63e1e5aSBadari Pulavarty size -= chunksize; 219e63e1e5aSBadari Pulavarty buf += chunksize; 220e63e1e5aSBadari Pulavarty copied += chunksize; 221e63e1e5aSBadari Pulavarty i++; 222e63e1e5aSBadari Pulavarty } 223e63e1e5aSBadari Pulavarty return copied ? copied : -EFAULT; 224e63e1e5aSBadari Pulavarty } 225e63e1e5aSBadari Pulavarty 226e63e1e5aSBadari Pulavarty /* 227e63e1e5aSBadari Pulavarty * Support for read() - Find the page attached to f_mapping and copy out the 228e63e1e5aSBadari Pulavarty * data. Its *very* similar to do_generic_mapping_read(), we can't use that 229e63e1e5aSBadari Pulavarty * since it has PAGE_CACHE_SIZE assumptions. 230e63e1e5aSBadari Pulavarty */ 231e63e1e5aSBadari Pulavarty static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, 232e63e1e5aSBadari Pulavarty size_t len, loff_t *ppos) 233e63e1e5aSBadari Pulavarty { 234a5516438SAndi Kleen struct hstate *h = hstate_file(filp); 235e63e1e5aSBadari Pulavarty struct address_space *mapping = filp->f_mapping; 236e63e1e5aSBadari Pulavarty struct inode *inode = mapping->host; 237a5516438SAndi Kleen unsigned long index = *ppos >> huge_page_shift(h); 238a5516438SAndi Kleen unsigned long offset = *ppos & ~huge_page_mask(h); 239e63e1e5aSBadari Pulavarty unsigned long end_index; 240e63e1e5aSBadari Pulavarty loff_t isize; 241e63e1e5aSBadari Pulavarty ssize_t retval = 0; 242e63e1e5aSBadari Pulavarty 243e63e1e5aSBadari Pulavarty /* validate length */ 244e63e1e5aSBadari Pulavarty if (len == 0) 245e63e1e5aSBadari Pulavarty goto out; 246e63e1e5aSBadari Pulavarty 247e63e1e5aSBadari Pulavarty for (;;) { 248e63e1e5aSBadari Pulavarty struct page *page; 249a5516438SAndi Kleen unsigned long nr, ret; 25091bf189cSRoel Kluin int ra; 251e63e1e5aSBadari Pulavarty 252e63e1e5aSBadari Pulavarty /* nr is the maximum number of bytes to copy from this page */ 253a5516438SAndi Kleen nr = huge_page_size(h); 254a05b0855SAneesh Kumar K.V isize = i_size_read(inode); 255a05b0855SAneesh Kumar K.V if (!isize) 256a05b0855SAneesh Kumar K.V goto out; 257a05b0855SAneesh Kumar K.V end_index = (isize - 1) >> huge_page_shift(h); 258e63e1e5aSBadari Pulavarty if (index >= end_index) { 259e63e1e5aSBadari Pulavarty if (index > end_index) 260e63e1e5aSBadari Pulavarty goto out; 261a5516438SAndi Kleen nr = ((isize - 1) & ~huge_page_mask(h)) + 1; 262a05b0855SAneesh Kumar K.V if (nr <= offset) 263e63e1e5aSBadari Pulavarty goto out; 264e63e1e5aSBadari Pulavarty } 265e63e1e5aSBadari Pulavarty nr = nr - offset; 266e63e1e5aSBadari Pulavarty 267e63e1e5aSBadari Pulavarty /* Find the page */ 268a05b0855SAneesh Kumar K.V page = find_lock_page(mapping, index); 269e63e1e5aSBadari Pulavarty if (unlikely(page == NULL)) { 270e63e1e5aSBadari Pulavarty /* 271e63e1e5aSBadari Pulavarty * We have a HOLE, zero out the user-buffer for the 272e63e1e5aSBadari Pulavarty * length of the hole or request. 273e63e1e5aSBadari Pulavarty */ 274e63e1e5aSBadari Pulavarty ret = len < nr ? len : nr; 275e63e1e5aSBadari Pulavarty if (clear_user(buf, ret)) 27691bf189cSRoel Kluin ra = -EFAULT; 27791bf189cSRoel Kluin else 27891bf189cSRoel Kluin ra = 0; 279e63e1e5aSBadari Pulavarty } else { 280a05b0855SAneesh Kumar K.V unlock_page(page); 281a05b0855SAneesh Kumar K.V 282e63e1e5aSBadari Pulavarty /* 283e63e1e5aSBadari Pulavarty * We have the page, copy it to user space buffer. 284e63e1e5aSBadari Pulavarty */ 28591bf189cSRoel Kluin ra = hugetlbfs_read_actor(page, offset, buf, len, nr); 28691bf189cSRoel Kluin ret = ra; 287a05b0855SAneesh Kumar K.V page_cache_release(page); 288e63e1e5aSBadari Pulavarty } 28991bf189cSRoel Kluin if (ra < 0) { 290e63e1e5aSBadari Pulavarty if (retval == 0) 29191bf189cSRoel Kluin retval = ra; 292e63e1e5aSBadari Pulavarty goto out; 293e63e1e5aSBadari Pulavarty } 294e63e1e5aSBadari Pulavarty 295e63e1e5aSBadari Pulavarty offset += ret; 296e63e1e5aSBadari Pulavarty retval += ret; 297e63e1e5aSBadari Pulavarty len -= ret; 298a5516438SAndi Kleen index += offset >> huge_page_shift(h); 299a5516438SAndi Kleen offset &= ~huge_page_mask(h); 300e63e1e5aSBadari Pulavarty 301e63e1e5aSBadari Pulavarty /* short read or no more work */ 302e63e1e5aSBadari Pulavarty if ((ret != nr) || (len == 0)) 303e63e1e5aSBadari Pulavarty break; 304e63e1e5aSBadari Pulavarty } 305e63e1e5aSBadari Pulavarty out: 306a5516438SAndi Kleen *ppos = ((loff_t)index << huge_page_shift(h)) + offset; 307e63e1e5aSBadari Pulavarty return retval; 308e63e1e5aSBadari Pulavarty } 309e63e1e5aSBadari Pulavarty 310800d15a5SNick Piggin static int hugetlbfs_write_begin(struct file *file, 311800d15a5SNick Piggin struct address_space *mapping, 312800d15a5SNick Piggin loff_t pos, unsigned len, unsigned flags, 313800d15a5SNick Piggin struct page **pagep, void **fsdata) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds return -EINVAL; 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 318800d15a5SNick Piggin static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, 319800d15a5SNick Piggin loff_t pos, unsigned len, unsigned copied, 320800d15a5SNick Piggin struct page *page, void *fsdata) 3211da177e4SLinus Torvalds { 322800d15a5SNick Piggin BUG(); 3231da177e4SLinus Torvalds return -EINVAL; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds static void truncate_huge_page(struct page *page) 3271da177e4SLinus Torvalds { 328fba2591bSLinus Torvalds cancel_dirty_page(page, /* No IO accounting for huge pages? */0); 3291da177e4SLinus Torvalds ClearPageUptodate(page); 330bd65cb86SMinchan Kim delete_from_page_cache(page); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 333b45b5bd6SDavid Gibson static void truncate_hugepages(struct inode *inode, loff_t lstart) 3341da177e4SLinus Torvalds { 335a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 336b45b5bd6SDavid Gibson struct address_space *mapping = &inode->i_data; 337a5516438SAndi Kleen const pgoff_t start = lstart >> huge_page_shift(h); 3381da177e4SLinus Torvalds struct pagevec pvec; 3391da177e4SLinus Torvalds pgoff_t next; 340a43a8c39SChen, Kenneth W int i, freed = 0; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds pagevec_init(&pvec, 0); 3431da177e4SLinus Torvalds next = start; 3441da177e4SLinus Torvalds while (1) { 3451da177e4SLinus Torvalds if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 3461da177e4SLinus Torvalds if (next == start) 3471da177e4SLinus Torvalds break; 3481da177e4SLinus Torvalds next = start; 3491da177e4SLinus Torvalds continue; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); ++i) { 3531da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds lock_page(page); 3561da177e4SLinus Torvalds if (page->index > next) 3571da177e4SLinus Torvalds next = page->index; 3581da177e4SLinus Torvalds ++next; 3591da177e4SLinus Torvalds truncate_huge_page(page); 3601da177e4SLinus Torvalds unlock_page(page); 361a43a8c39SChen, Kenneth W freed++; 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds huge_pagevec_release(&pvec); 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds BUG_ON(!lstart && mapping->nrpages); 366a43a8c39SChen, Kenneth W hugetlb_unreserve_pages(inode, start, freed); 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3692bbbda30SAl Viro static void hugetlbfs_evict_inode(struct inode *inode) 3701da177e4SLinus Torvalds { 3719119a41eSJoonsoo Kim struct resv_map *resv_map; 3729119a41eSJoonsoo Kim 373b45b5bd6SDavid Gibson truncate_hugepages(inode, 0); 3749119a41eSJoonsoo Kim resv_map = (struct resv_map *)inode->i_mapping->private_data; 3759119a41eSJoonsoo Kim /* root inode doesn't have the resv_map, so we should check it */ 3769119a41eSJoonsoo Kim if (resv_map) 3779119a41eSJoonsoo Kim resv_map_release(&resv_map->refs); 378dbd5768fSJan Kara clear_inode(inode); 379149f4211SChristoph Hellwig } 380149f4211SChristoph Hellwig 3811da177e4SLinus Torvalds static inline void 3826b2dbba8SMichel Lespinasse hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) 3831da177e4SLinus Torvalds { 3841da177e4SLinus Torvalds struct vm_area_struct *vma; 3851da177e4SLinus Torvalds 3866b2dbba8SMichel Lespinasse vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { 3871da177e4SLinus Torvalds unsigned long v_offset; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* 390856fc295SHugh Dickins * Can the expression below overflow on 32-bit arches? 3916b2dbba8SMichel Lespinasse * No, because the interval tree returns us only those vmas 392856fc295SHugh Dickins * which overlap the truncated area starting at pgoff, 393856fc295SHugh Dickins * and no vma on a 32-bit arch can span beyond the 4GB. 3941da177e4SLinus Torvalds */ 395856fc295SHugh Dickins if (vma->vm_pgoff < pgoff) 396856fc295SHugh Dickins v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; 397856fc295SHugh Dickins else 3981da177e4SLinus Torvalds v_offset = 0; 3991da177e4SLinus Torvalds 40024669e58SAneesh Kumar K.V unmap_hugepage_range(vma, vma->vm_start + v_offset, 40124669e58SAneesh Kumar K.V vma->vm_end, NULL); 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) 4061da177e4SLinus Torvalds { 407856fc295SHugh Dickins pgoff_t pgoff; 4081da177e4SLinus Torvalds struct address_space *mapping = inode->i_mapping; 409a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 4101da177e4SLinus Torvalds 411a5516438SAndi Kleen BUG_ON(offset & ~huge_page_mask(h)); 412856fc295SHugh Dickins pgoff = offset >> PAGE_SHIFT; 4131da177e4SLinus Torvalds 4147aa91e10SKen Chen i_size_write(inode, offset); 41583cde9e8SDavidlohr Bueso i_mmap_lock_write(mapping); 4166b2dbba8SMichel Lespinasse if (!RB_EMPTY_ROOT(&mapping->i_mmap)) 4171da177e4SLinus Torvalds hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); 41883cde9e8SDavidlohr Bueso i_mmap_unlock_write(mapping); 419b45b5bd6SDavid Gibson truncate_hugepages(inode, offset); 4201da177e4SLinus Torvalds return 0; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) 4241da177e4SLinus Torvalds { 4251da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 426a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 4271da177e4SLinus Torvalds int error; 4281da177e4SLinus Torvalds unsigned int ia_valid = attr->ia_valid; 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds BUG_ON(!inode); 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds error = inode_change_ok(inode, attr); 4331da177e4SLinus Torvalds if (error) 4341025774cSChristoph Hellwig return error; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds if (ia_valid & ATTR_SIZE) { 4371da177e4SLinus Torvalds error = -EINVAL; 4381025774cSChristoph Hellwig if (attr->ia_size & ~huge_page_mask(h)) 4391025774cSChristoph Hellwig return -EINVAL; 4401da177e4SLinus Torvalds error = hugetlb_vmtruncate(inode, attr->ia_size); 4411da177e4SLinus Torvalds if (error) 4421da177e4SLinus Torvalds return error; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 4451025774cSChristoph Hellwig setattr_copy(inode, attr); 4461025774cSChristoph Hellwig mark_inode_dirty(inode); 4471025774cSChristoph Hellwig return 0; 4481025774cSChristoph Hellwig } 4491025774cSChristoph Hellwig 4507d54fa64SAl Viro static struct inode *hugetlbfs_get_root(struct super_block *sb, 4517d54fa64SAl Viro struct hugetlbfs_config *config) 4521da177e4SLinus Torvalds { 4531da177e4SLinus Torvalds struct inode *inode; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds inode = new_inode(sb); 4561da177e4SLinus Torvalds if (inode) { 4571da177e4SLinus Torvalds struct hugetlbfs_inode_info *info; 45885fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4597d54fa64SAl Viro inode->i_mode = S_IFDIR | config->mode; 4607d54fa64SAl Viro inode->i_uid = config->uid; 4617d54fa64SAl Viro inode->i_gid = config->gid; 4627d54fa64SAl Viro inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4637d54fa64SAl Viro info = HUGETLBFS_I(inode); 4647d54fa64SAl Viro mpol_shared_policy_init(&info->policy, NULL); 4657d54fa64SAl Viro inode->i_op = &hugetlbfs_dir_inode_operations; 4667d54fa64SAl Viro inode->i_fop = &simple_dir_operations; 4677d54fa64SAl Viro /* directory inodes start off with i_nlink == 2 (for "." entry) */ 4687d54fa64SAl Viro inc_nlink(inode); 46965ed7601SAneesh Kumar K.V lockdep_annotate_inode_mutex_key(inode); 4707d54fa64SAl Viro } 4717d54fa64SAl Viro return inode; 4727d54fa64SAl Viro } 4737d54fa64SAl Viro 474b610ded7SMichal Hocko /* 475c8c06efaSDavidlohr Bueso * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never 476b610ded7SMichal Hocko * be taken from reclaim -- unlike regular filesystems. This needs an 477b610ded7SMichal Hocko * annotation because huge_pmd_share() does an allocation under 478c8c06efaSDavidlohr Bueso * i_mmap_rwsem. 479b610ded7SMichal Hocko */ 480c8c06efaSDavidlohr Bueso static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; 481b610ded7SMichal Hocko 4827d54fa64SAl Viro static struct inode *hugetlbfs_get_inode(struct super_block *sb, 4837d54fa64SAl Viro struct inode *dir, 48418df2252SAl Viro umode_t mode, dev_t dev) 4857d54fa64SAl Viro { 4867d54fa64SAl Viro struct inode *inode; 4879119a41eSJoonsoo Kim struct resv_map *resv_map; 4889119a41eSJoonsoo Kim 4899119a41eSJoonsoo Kim resv_map = resv_map_alloc(); 4909119a41eSJoonsoo Kim if (!resv_map) 4919119a41eSJoonsoo Kim return NULL; 4927d54fa64SAl Viro 4937d54fa64SAl Viro inode = new_inode(sb); 4947d54fa64SAl Viro if (inode) { 4957d54fa64SAl Viro struct hugetlbfs_inode_info *info; 4967d54fa64SAl Viro inode->i_ino = get_next_ino(); 4977d54fa64SAl Viro inode_init_owner(inode, dir, mode); 498c8c06efaSDavidlohr Bueso lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, 499c8c06efaSDavidlohr Bueso &hugetlbfs_i_mmap_rwsem_key); 5001da177e4SLinus Torvalds inode->i_mapping->a_ops = &hugetlbfs_aops; 5011da177e4SLinus Torvalds inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; 5021da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 5039119a41eSJoonsoo Kim inode->i_mapping->private_data = resv_map; 5041da177e4SLinus Torvalds info = HUGETLBFS_I(inode); 5056bfde05bSEric B Munson /* 5066bfde05bSEric B Munson * The policy is initialized here even if we are creating a 5076bfde05bSEric B Munson * private inode because initialization simply creates an 5086bfde05bSEric B Munson * an empty rb tree and calls spin_lock_init(), later when we 5096bfde05bSEric B Munson * call mpol_free_shared_policy() it will just return because 5106bfde05bSEric B Munson * the rb tree will still be empty. 5116bfde05bSEric B Munson */ 51271fe804bSLee Schermerhorn mpol_shared_policy_init(&info->policy, NULL); 5131da177e4SLinus Torvalds switch (mode & S_IFMT) { 5141da177e4SLinus Torvalds default: 5151da177e4SLinus Torvalds init_special_inode(inode, mode, dev); 5161da177e4SLinus Torvalds break; 5171da177e4SLinus Torvalds case S_IFREG: 5181da177e4SLinus Torvalds inode->i_op = &hugetlbfs_inode_operations; 5191da177e4SLinus Torvalds inode->i_fop = &hugetlbfs_file_operations; 5201da177e4SLinus Torvalds break; 5211da177e4SLinus Torvalds case S_IFDIR: 5221da177e4SLinus Torvalds inode->i_op = &hugetlbfs_dir_inode_operations; 5231da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds /* directory inodes start off with i_nlink == 2 (for "." entry) */ 526d8c76e6fSDave Hansen inc_nlink(inode); 5271da177e4SLinus Torvalds break; 5281da177e4SLinus Torvalds case S_IFLNK: 5291da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 5301da177e4SLinus Torvalds break; 5311da177e4SLinus Torvalds } 532e096d0c7SJosh Boyer lockdep_annotate_inode_mutex_key(inode); 5339119a41eSJoonsoo Kim } else 5349119a41eSJoonsoo Kim kref_put(&resv_map->refs, resv_map_release); 5359119a41eSJoonsoo Kim 5361da177e4SLinus Torvalds return inode; 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds /* 5401da177e4SLinus Torvalds * File creation. Allocate an inode, and we're done.. 5411da177e4SLinus Torvalds */ 5421da177e4SLinus Torvalds static int hugetlbfs_mknod(struct inode *dir, 5431a67aafbSAl Viro struct dentry *dentry, umode_t mode, dev_t dev) 5441da177e4SLinus Torvalds { 5451da177e4SLinus Torvalds struct inode *inode; 5461da177e4SLinus Torvalds int error = -ENOSPC; 5471da177e4SLinus Torvalds 5487d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); 5491da177e4SLinus Torvalds if (inode) { 5501da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5511da177e4SLinus Torvalds d_instantiate(dentry, inode); 5521da177e4SLinus Torvalds dget(dentry); /* Extra count - pin the dentry in core */ 5531da177e4SLinus Torvalds error = 0; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds return error; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 55818bb1db3SAl Viro static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 5591da177e4SLinus Torvalds { 5601da177e4SLinus Torvalds int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); 5611da177e4SLinus Torvalds if (!retval) 562d8c76e6fSDave Hansen inc_nlink(dir); 5631da177e4SLinus Torvalds return retval; 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds 566ebfc3b49SAl Viro static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) 5671da177e4SLinus Torvalds { 5681da177e4SLinus Torvalds return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds static int hugetlbfs_symlink(struct inode *dir, 5721da177e4SLinus Torvalds struct dentry *dentry, const char *symname) 5731da177e4SLinus Torvalds { 5741da177e4SLinus Torvalds struct inode *inode; 5751da177e4SLinus Torvalds int error = -ENOSPC; 5761da177e4SLinus Torvalds 5777d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); 5781da177e4SLinus Torvalds if (inode) { 5791da177e4SLinus Torvalds int l = strlen(symname)+1; 5801da177e4SLinus Torvalds error = page_symlink(inode, symname, l); 5811da177e4SLinus Torvalds if (!error) { 5821da177e4SLinus Torvalds d_instantiate(dentry, inode); 5831da177e4SLinus Torvalds dget(dentry); 5841da177e4SLinus Torvalds } else 5851da177e4SLinus Torvalds iput(inode); 5861da177e4SLinus Torvalds } 5871da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds return error; 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds /* 5936649a386SKen Chen * mark the head page dirty 5941da177e4SLinus Torvalds */ 5951da177e4SLinus Torvalds static int hugetlbfs_set_page_dirty(struct page *page) 5961da177e4SLinus Torvalds { 597d85f3385SChristoph Lameter struct page *head = compound_head(page); 5986649a386SKen Chen 5996649a386SKen Chen SetPageDirty(head); 6001da177e4SLinus Torvalds return 0; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 603290408d4SNaoya Horiguchi static int hugetlbfs_migrate_page(struct address_space *mapping, 604b969c4abSMel Gorman struct page *newpage, struct page *page, 605a6bc32b8SMel Gorman enum migrate_mode mode) 606290408d4SNaoya Horiguchi { 607290408d4SNaoya Horiguchi int rc; 608290408d4SNaoya Horiguchi 609290408d4SNaoya Horiguchi rc = migrate_huge_page_move_mapping(mapping, newpage, page); 61078bd5209SRafael Aquini if (rc != MIGRATEPAGE_SUCCESS) 611290408d4SNaoya Horiguchi return rc; 612290408d4SNaoya Horiguchi migrate_page_copy(newpage, page); 613290408d4SNaoya Horiguchi 61478bd5209SRafael Aquini return MIGRATEPAGE_SUCCESS; 615290408d4SNaoya Horiguchi } 616290408d4SNaoya Horiguchi 617726c3342SDavid Howells static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) 6181da177e4SLinus Torvalds { 619726c3342SDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); 620a5516438SAndi Kleen struct hstate *h = hstate_inode(dentry->d_inode); 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds buf->f_type = HUGETLBFS_MAGIC; 623a5516438SAndi Kleen buf->f_bsize = huge_page_size(h); 6241da177e4SLinus Torvalds if (sbinfo) { 6251da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 62674a8a65cSDavid Gibson /* If no limits set, just report 0 for max/free/used 62774a8a65cSDavid Gibson * blocks, like simple_statfs() */ 62890481622SDavid Gibson if (sbinfo->spool) { 62990481622SDavid Gibson long free_pages; 63090481622SDavid Gibson 63190481622SDavid Gibson spin_lock(&sbinfo->spool->lock); 63290481622SDavid Gibson buf->f_blocks = sbinfo->spool->max_hpages; 63390481622SDavid Gibson free_pages = sbinfo->spool->max_hpages 63490481622SDavid Gibson - sbinfo->spool->used_hpages; 63590481622SDavid Gibson buf->f_bavail = buf->f_bfree = free_pages; 63690481622SDavid Gibson spin_unlock(&sbinfo->spool->lock); 6371da177e4SLinus Torvalds buf->f_files = sbinfo->max_inodes; 6381da177e4SLinus Torvalds buf->f_ffree = sbinfo->free_inodes; 63974a8a65cSDavid Gibson } 6401da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds buf->f_namelen = NAME_MAX; 6431da177e4SLinus Torvalds return 0; 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds static void hugetlbfs_put_super(struct super_block *sb) 6471da177e4SLinus Torvalds { 6481da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds if (sbi) { 6511da177e4SLinus Torvalds sb->s_fs_info = NULL; 65290481622SDavid Gibson 65390481622SDavid Gibson if (sbi->spool) 65490481622SDavid Gibson hugepage_put_subpool(sbi->spool); 65590481622SDavid Gibson 6561da177e4SLinus Torvalds kfree(sbi); 6571da177e4SLinus Torvalds } 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 66096527980SChristoph Hellwig static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) 66196527980SChristoph Hellwig { 66296527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 66396527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 66496527980SChristoph Hellwig if (unlikely(!sbinfo->free_inodes)) { 66596527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 66696527980SChristoph Hellwig return 0; 66796527980SChristoph Hellwig } 66896527980SChristoph Hellwig sbinfo->free_inodes--; 66996527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 67096527980SChristoph Hellwig } 67196527980SChristoph Hellwig 67296527980SChristoph Hellwig return 1; 67396527980SChristoph Hellwig } 67496527980SChristoph Hellwig 67596527980SChristoph Hellwig static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) 67696527980SChristoph Hellwig { 67796527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 67896527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 67996527980SChristoph Hellwig sbinfo->free_inodes++; 68096527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 68196527980SChristoph Hellwig } 68296527980SChristoph Hellwig } 68396527980SChristoph Hellwig 68496527980SChristoph Hellwig 685e18b890bSChristoph Lameter static struct kmem_cache *hugetlbfs_inode_cachep; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) 6881da177e4SLinus Torvalds { 68996527980SChristoph Hellwig struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); 6901da177e4SLinus Torvalds struct hugetlbfs_inode_info *p; 6911da177e4SLinus Torvalds 69296527980SChristoph Hellwig if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) 6931da177e4SLinus Torvalds return NULL; 694e94b1766SChristoph Lameter p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); 69596527980SChristoph Hellwig if (unlikely(!p)) { 69696527980SChristoph Hellwig hugetlbfs_inc_free_inodes(sbinfo); 69796527980SChristoph Hellwig return NULL; 6981da177e4SLinus Torvalds } 69996527980SChristoph Hellwig return &p->vfs_inode; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 702fa0d7e3dSNick Piggin static void hugetlbfs_i_callback(struct rcu_head *head) 703fa0d7e3dSNick Piggin { 704fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 705fa0d7e3dSNick Piggin kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); 706fa0d7e3dSNick Piggin } 707fa0d7e3dSNick Piggin 7081da177e4SLinus Torvalds static void hugetlbfs_destroy_inode(struct inode *inode) 7091da177e4SLinus Torvalds { 71096527980SChristoph Hellwig hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); 7111da177e4SLinus Torvalds mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); 712fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, hugetlbfs_i_callback); 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 715f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops = { 716800d15a5SNick Piggin .write_begin = hugetlbfs_write_begin, 717800d15a5SNick Piggin .write_end = hugetlbfs_write_end, 7181da177e4SLinus Torvalds .set_page_dirty = hugetlbfs_set_page_dirty, 719290408d4SNaoya Horiguchi .migratepage = hugetlbfs_migrate_page, 7201da177e4SLinus Torvalds }; 7211da177e4SLinus Torvalds 72296527980SChristoph Hellwig 72351cc5068SAlexey Dobriyan static void init_once(void *foo) 72496527980SChristoph Hellwig { 72596527980SChristoph Hellwig struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; 72696527980SChristoph Hellwig 72796527980SChristoph Hellwig inode_init_once(&ei->vfs_inode); 72896527980SChristoph Hellwig } 72996527980SChristoph Hellwig 7304b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations = { 731e63e1e5aSBadari Pulavarty .read = hugetlbfs_read, 7321da177e4SLinus Torvalds .mmap = hugetlbfs_file_mmap, 7331b061d92SChristoph Hellwig .fsync = noop_fsync, 7341da177e4SLinus Torvalds .get_unmapped_area = hugetlb_get_unmapped_area, 7356038f373SArnd Bergmann .llseek = default_llseek, 7361da177e4SLinus Torvalds }; 7371da177e4SLinus Torvalds 73892e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations = { 7391da177e4SLinus Torvalds .create = hugetlbfs_create, 7401da177e4SLinus Torvalds .lookup = simple_lookup, 7411da177e4SLinus Torvalds .link = simple_link, 7421da177e4SLinus Torvalds .unlink = simple_unlink, 7431da177e4SLinus Torvalds .symlink = hugetlbfs_symlink, 7441da177e4SLinus Torvalds .mkdir = hugetlbfs_mkdir, 7451da177e4SLinus Torvalds .rmdir = simple_rmdir, 7461da177e4SLinus Torvalds .mknod = hugetlbfs_mknod, 7471da177e4SLinus Torvalds .rename = simple_rename, 7481da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7491da177e4SLinus Torvalds }; 7501da177e4SLinus Torvalds 75192e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations = { 7521da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7531da177e4SLinus Torvalds }; 7541da177e4SLinus Torvalds 755ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops = { 7561da177e4SLinus Torvalds .alloc_inode = hugetlbfs_alloc_inode, 7571da177e4SLinus Torvalds .destroy_inode = hugetlbfs_destroy_inode, 7582bbbda30SAl Viro .evict_inode = hugetlbfs_evict_inode, 7591da177e4SLinus Torvalds .statfs = hugetlbfs_statfs, 7601da177e4SLinus Torvalds .put_super = hugetlbfs_put_super, 76110f19a86SMiklos Szeredi .show_options = generic_show_options, 7621da177e4SLinus Torvalds }; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds static int 7651da177e4SLinus Torvalds hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 7661da177e4SLinus Torvalds { 767e73a75faSRandy Dunlap char *p, *rest; 768e73a75faSRandy Dunlap substring_t args[MAX_OPT_ARGS]; 769e73a75faSRandy Dunlap int option; 770a137e1ccSAndi Kleen unsigned long long size = 0; 771a137e1ccSAndi Kleen enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds if (!options) 7741da177e4SLinus Torvalds return 0; 7751da177e4SLinus Torvalds 776e73a75faSRandy Dunlap while ((p = strsep(&options, ",")) != NULL) { 777e73a75faSRandy Dunlap int token; 778b4c07bceSLee Schermerhorn if (!*p) 779b4c07bceSLee Schermerhorn continue; 7801da177e4SLinus Torvalds 781e73a75faSRandy Dunlap token = match_token(p, tokens, args); 782e73a75faSRandy Dunlap switch (token) { 783e73a75faSRandy Dunlap case Opt_uid: 784e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 785e73a75faSRandy Dunlap goto bad_val; 786a0eb3a05SEric W. Biederman pconfig->uid = make_kuid(current_user_ns(), option); 787a0eb3a05SEric W. Biederman if (!uid_valid(pconfig->uid)) 788a0eb3a05SEric W. Biederman goto bad_val; 789e73a75faSRandy Dunlap break; 790e73a75faSRandy Dunlap 791e73a75faSRandy Dunlap case Opt_gid: 792e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 793e73a75faSRandy Dunlap goto bad_val; 794a0eb3a05SEric W. Biederman pconfig->gid = make_kgid(current_user_ns(), option); 795a0eb3a05SEric W. Biederman if (!gid_valid(pconfig->gid)) 796a0eb3a05SEric W. Biederman goto bad_val; 797e73a75faSRandy Dunlap break; 798e73a75faSRandy Dunlap 799e73a75faSRandy Dunlap case Opt_mode: 800e73a75faSRandy Dunlap if (match_octal(&args[0], &option)) 801e73a75faSRandy Dunlap goto bad_val; 80275897d60SKen Chen pconfig->mode = option & 01777U; 803e73a75faSRandy Dunlap break; 804e73a75faSRandy Dunlap 805e73a75faSRandy Dunlap case Opt_size: { 806e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 807e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 808e73a75faSRandy Dunlap goto bad_val; 809e73a75faSRandy Dunlap size = memparse(args[0].from, &rest); 810a137e1ccSAndi Kleen setsize = SIZE_STD; 811a137e1ccSAndi Kleen if (*rest == '%') 812a137e1ccSAndi Kleen setsize = SIZE_PERCENT; 813e73a75faSRandy Dunlap break; 814e73a75faSRandy Dunlap } 8151da177e4SLinus Torvalds 816e73a75faSRandy Dunlap case Opt_nr_inodes: 817e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 818e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 819e73a75faSRandy Dunlap goto bad_val; 820e73a75faSRandy Dunlap pconfig->nr_inodes = memparse(args[0].from, &rest); 821e73a75faSRandy Dunlap break; 822e73a75faSRandy Dunlap 823a137e1ccSAndi Kleen case Opt_pagesize: { 824a137e1ccSAndi Kleen unsigned long ps; 825a137e1ccSAndi Kleen ps = memparse(args[0].from, &rest); 826a137e1ccSAndi Kleen pconfig->hstate = size_to_hstate(ps); 827a137e1ccSAndi Kleen if (!pconfig->hstate) { 8289b857d26SAndrew Morton pr_err("Unsupported page size %lu MB\n", 829a137e1ccSAndi Kleen ps >> 20); 830a137e1ccSAndi Kleen return -EINVAL; 831a137e1ccSAndi Kleen } 832a137e1ccSAndi Kleen break; 833a137e1ccSAndi Kleen } 834a137e1ccSAndi Kleen 835e73a75faSRandy Dunlap default: 8369b857d26SAndrew Morton pr_err("Bad mount option: \"%s\"\n", p); 837b4c07bceSLee Schermerhorn return -EINVAL; 838e73a75faSRandy Dunlap break; 839e73a75faSRandy Dunlap } 8401da177e4SLinus Torvalds } 841a137e1ccSAndi Kleen 842a137e1ccSAndi Kleen /* Do size after hstate is set up */ 843a137e1ccSAndi Kleen if (setsize > NO_SIZE) { 844a137e1ccSAndi Kleen struct hstate *h = pconfig->hstate; 845a137e1ccSAndi Kleen if (setsize == SIZE_PERCENT) { 846a137e1ccSAndi Kleen size <<= huge_page_shift(h); 847a137e1ccSAndi Kleen size *= h->max_huge_pages; 848a137e1ccSAndi Kleen do_div(size, 100); 849a137e1ccSAndi Kleen } 850a137e1ccSAndi Kleen pconfig->nr_blocks = (size >> huge_page_shift(h)); 851a137e1ccSAndi Kleen } 852a137e1ccSAndi Kleen 8531da177e4SLinus Torvalds return 0; 854e73a75faSRandy Dunlap 855e73a75faSRandy Dunlap bad_val: 8569b857d26SAndrew Morton pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); 857c12ddba0SAkinobu Mita return -EINVAL; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds static int 8611da177e4SLinus Torvalds hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 8621da177e4SLinus Torvalds { 8631da177e4SLinus Torvalds int ret; 8641da177e4SLinus Torvalds struct hugetlbfs_config config; 8651da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo; 8661da177e4SLinus Torvalds 86710f19a86SMiklos Szeredi save_mount_options(sb, data); 86810f19a86SMiklos Szeredi 8691da177e4SLinus Torvalds config.nr_blocks = -1; /* No limit on size by default */ 8701da177e4SLinus Torvalds config.nr_inodes = -1; /* No limit on number of inodes by default */ 87177c70de1SDavid Howells config.uid = current_fsuid(); 87277c70de1SDavid Howells config.gid = current_fsgid(); 8731da177e4SLinus Torvalds config.mode = 0755; 874a137e1ccSAndi Kleen config.hstate = &default_hstate; 8751da177e4SLinus Torvalds ret = hugetlbfs_parse_options(data, &config); 8761da177e4SLinus Torvalds if (ret) 8771da177e4SLinus Torvalds return ret; 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); 8801da177e4SLinus Torvalds if (!sbinfo) 8811da177e4SLinus Torvalds return -ENOMEM; 8821da177e4SLinus Torvalds sb->s_fs_info = sbinfo; 883a137e1ccSAndi Kleen sbinfo->hstate = config.hstate; 8841da177e4SLinus Torvalds spin_lock_init(&sbinfo->stat_lock); 8851da177e4SLinus Torvalds sbinfo->max_inodes = config.nr_inodes; 8861da177e4SLinus Torvalds sbinfo->free_inodes = config.nr_inodes; 88790481622SDavid Gibson sbinfo->spool = NULL; 88890481622SDavid Gibson if (config.nr_blocks != -1) { 88990481622SDavid Gibson sbinfo->spool = hugepage_new_subpool(config.nr_blocks); 89090481622SDavid Gibson if (!sbinfo->spool) 89190481622SDavid Gibson goto out_free; 89290481622SDavid Gibson } 8931da177e4SLinus Torvalds sb->s_maxbytes = MAX_LFS_FILESIZE; 894a137e1ccSAndi Kleen sb->s_blocksize = huge_page_size(config.hstate); 895a137e1ccSAndi Kleen sb->s_blocksize_bits = huge_page_shift(config.hstate); 8961da177e4SLinus Torvalds sb->s_magic = HUGETLBFS_MAGIC; 8971da177e4SLinus Torvalds sb->s_op = &hugetlbfs_ops; 8981da177e4SLinus Torvalds sb->s_time_gran = 1; 89948fde701SAl Viro sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); 90048fde701SAl Viro if (!sb->s_root) 9011da177e4SLinus Torvalds goto out_free; 9021da177e4SLinus Torvalds return 0; 9031da177e4SLinus Torvalds out_free: 90490481622SDavid Gibson kfree(sbinfo->spool); 9051da177e4SLinus Torvalds kfree(sbinfo); 9061da177e4SLinus Torvalds return -ENOMEM; 9071da177e4SLinus Torvalds } 9081da177e4SLinus Torvalds 9093c26ff6eSAl Viro static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, 9103c26ff6eSAl Viro int flags, const char *dev_name, void *data) 9111da177e4SLinus Torvalds { 9123c26ff6eSAl Viro return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds static struct file_system_type hugetlbfs_fs_type = { 9161da177e4SLinus Torvalds .name = "hugetlbfs", 9173c26ff6eSAl Viro .mount = hugetlbfs_mount, 9181da177e4SLinus Torvalds .kill_sb = kill_litter_super, 9191da177e4SLinus Torvalds }; 9207f78e035SEric W. Biederman MODULE_ALIAS_FS("hugetlbfs"); 9211da177e4SLinus Torvalds 92242d7395fSAndi Kleen static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; 9231da177e4SLinus Torvalds 924ef1ff6b8SFrom: Mel Gorman static int can_do_hugetlb_shm(void) 9251da177e4SLinus Torvalds { 926a0eb3a05SEric W. Biederman kgid_t shm_group; 927a0eb3a05SEric W. Biederman shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); 928a0eb3a05SEric W. Biederman return capable(CAP_IPC_LOCK) || in_group_p(shm_group); 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 93142d7395fSAndi Kleen static int get_hstate_idx(int page_size_log) 93242d7395fSAndi Kleen { 933af73e4d9SNaoya Horiguchi struct hstate *h = hstate_sizelog(page_size_log); 93442d7395fSAndi Kleen 93542d7395fSAndi Kleen if (!h) 93642d7395fSAndi Kleen return -1; 93742d7395fSAndi Kleen return h - hstates; 93842d7395fSAndi Kleen } 93942d7395fSAndi Kleen 940be1d2cf5SFabian Frederick static const struct dentry_operations anon_ops = { 941118b2302SAl Viro .d_dname = simple_dname 9420df4d6e5SAl Viro }; 9430df4d6e5SAl Viro 944af73e4d9SNaoya Horiguchi /* 945af73e4d9SNaoya Horiguchi * Note that size should be aligned to proper hugepage size in caller side, 946af73e4d9SNaoya Horiguchi * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. 947af73e4d9SNaoya Horiguchi */ 948af73e4d9SNaoya Horiguchi struct file *hugetlb_file_setup(const char *name, size_t size, 949af73e4d9SNaoya Horiguchi vm_flags_t acctflag, struct user_struct **user, 95042d7395fSAndi Kleen int creat_flags, int page_size_log) 9511da177e4SLinus Torvalds { 95239b65252SAnatol Pomozov struct file *file = ERR_PTR(-ENOMEM); 9531da177e4SLinus Torvalds struct inode *inode; 9542c48b9c4SAl Viro struct path path; 9550df4d6e5SAl Viro struct super_block *sb; 9561da177e4SLinus Torvalds struct qstr quick_string; 95742d7395fSAndi Kleen int hstate_idx; 95842d7395fSAndi Kleen 95942d7395fSAndi Kleen hstate_idx = get_hstate_idx(page_size_log); 96042d7395fSAndi Kleen if (hstate_idx < 0) 96142d7395fSAndi Kleen return ERR_PTR(-ENODEV); 9621da177e4SLinus Torvalds 963353d5c30SHugh Dickins *user = NULL; 96442d7395fSAndi Kleen if (!hugetlbfs_vfsmount[hstate_idx]) 9655bc98594SAkinobu Mita return ERR_PTR(-ENOENT); 9665bc98594SAkinobu Mita 967ef1ff6b8SFrom: Mel Gorman if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { 968353d5c30SHugh Dickins *user = current_user(); 969353d5c30SHugh Dickins if (user_shm_lock(size, *user)) { 97021a3c273SDavid Rientjes task_lock(current); 9719b857d26SAndrew Morton pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", 97221a3c273SDavid Rientjes current->comm, current->pid); 97321a3c273SDavid Rientjes task_unlock(current); 974353d5c30SHugh Dickins } else { 975353d5c30SHugh Dickins *user = NULL; 9761da177e4SLinus Torvalds return ERR_PTR(-EPERM); 9772584e517SRavikiran G Thirumalai } 978353d5c30SHugh Dickins } 9791da177e4SLinus Torvalds 9800df4d6e5SAl Viro sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; 9819d66586fSEric W. Biederman quick_string.name = name; 9821da177e4SLinus Torvalds quick_string.len = strlen(quick_string.name); 9831da177e4SLinus Torvalds quick_string.hash = 0; 9840df4d6e5SAl Viro path.dentry = d_alloc_pseudo(sb, &quick_string); 9852c48b9c4SAl Viro if (!path.dentry) 9861da177e4SLinus Torvalds goto out_shm_unlock; 9871da177e4SLinus Torvalds 9880df4d6e5SAl Viro d_set_d_op(path.dentry, &anon_ops); 98942d7395fSAndi Kleen path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); 99039b65252SAnatol Pomozov file = ERR_PTR(-ENOSPC); 9910df4d6e5SAl Viro inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); 9921da177e4SLinus Torvalds if (!inode) 993ce8d2cdfSDave Hansen goto out_dentry; 9941da177e4SLinus Torvalds 99539b65252SAnatol Pomozov file = ERR_PTR(-ENOMEM); 996af73e4d9SNaoya Horiguchi if (hugetlb_reserve_pages(inode, 0, 997af73e4d9SNaoya Horiguchi size >> huge_page_shift(hstate_inode(inode)), NULL, 998af73e4d9SNaoya Horiguchi acctflag)) 999b45b5bd6SDavid Gibson goto out_inode; 1000b45b5bd6SDavid Gibson 10012c48b9c4SAl Viro d_instantiate(path.dentry, inode); 10021da177e4SLinus Torvalds inode->i_size = size; 10036d6b77f1SMiklos Szeredi clear_nlink(inode); 1004ce8d2cdfSDave Hansen 10052c48b9c4SAl Viro file = alloc_file(&path, FMODE_WRITE | FMODE_READ, 1006ce8d2cdfSDave Hansen &hugetlbfs_file_operations); 100739b65252SAnatol Pomozov if (IS_ERR(file)) 1008b4d232e6SAl Viro goto out_dentry; /* inode is already attached */ 1009ce8d2cdfSDave Hansen 10101da177e4SLinus Torvalds return file; 10111da177e4SLinus Torvalds 1012b45b5bd6SDavid Gibson out_inode: 1013b45b5bd6SDavid Gibson iput(inode); 10141da177e4SLinus Torvalds out_dentry: 10152c48b9c4SAl Viro path_put(&path); 10161da177e4SLinus Torvalds out_shm_unlock: 1017353d5c30SHugh Dickins if (*user) { 1018353d5c30SHugh Dickins user_shm_unlock(size, *user); 1019353d5c30SHugh Dickins *user = NULL; 1020353d5c30SHugh Dickins } 102139b65252SAnatol Pomozov return file; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds static int __init init_hugetlbfs_fs(void) 10251da177e4SLinus Torvalds { 102642d7395fSAndi Kleen struct hstate *h; 10271da177e4SLinus Torvalds int error; 102842d7395fSAndi Kleen int i; 10291da177e4SLinus Torvalds 1030457c1b27SNishanth Aravamudan if (!hugepages_supported()) { 10319b857d26SAndrew Morton pr_info("disabling because there are no supported hugepage sizes\n"); 1032457c1b27SNishanth Aravamudan return -ENOTSUPP; 1033457c1b27SNishanth Aravamudan } 1034457c1b27SNishanth Aravamudan 1035e0bf68ddSPeter Zijlstra error = bdi_init(&hugetlbfs_backing_dev_info); 1036e0bf68ddSPeter Zijlstra if (error) 1037e0bf68ddSPeter Zijlstra return error; 1038e0bf68ddSPeter Zijlstra 1039d1d5e05fSHillf Danton error = -ENOMEM; 10401da177e4SLinus Torvalds hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", 10411da177e4SLinus Torvalds sizeof(struct hugetlbfs_inode_info), 104220c2df83SPaul Mundt 0, 0, init_once); 10431da177e4SLinus Torvalds if (hugetlbfs_inode_cachep == NULL) 1044e0bf68ddSPeter Zijlstra goto out2; 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds error = register_filesystem(&hugetlbfs_fs_type); 10471da177e4SLinus Torvalds if (error) 10481da177e4SLinus Torvalds goto out; 10491da177e4SLinus Torvalds 105042d7395fSAndi Kleen i = 0; 105142d7395fSAndi Kleen for_each_hstate(h) { 105242d7395fSAndi Kleen char buf[50]; 105342d7395fSAndi Kleen unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); 10541da177e4SLinus Torvalds 105542d7395fSAndi Kleen snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); 105642d7395fSAndi Kleen hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, 105742d7395fSAndi Kleen buf); 105842d7395fSAndi Kleen 105942d7395fSAndi Kleen if (IS_ERR(hugetlbfs_vfsmount[i])) { 10609b857d26SAndrew Morton pr_err("Cannot mount internal hugetlbfs for " 106142d7395fSAndi Kleen "page size %uK", ps_kb); 106242d7395fSAndi Kleen error = PTR_ERR(hugetlbfs_vfsmount[i]); 106342d7395fSAndi Kleen hugetlbfs_vfsmount[i] = NULL; 10641da177e4SLinus Torvalds } 106542d7395fSAndi Kleen i++; 106642d7395fSAndi Kleen } 106742d7395fSAndi Kleen /* Non default hstates are optional */ 106842d7395fSAndi Kleen if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) 106942d7395fSAndi Kleen return 0; 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds out: 10721da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 1073e0bf68ddSPeter Zijlstra out2: 1074e0bf68ddSPeter Zijlstra bdi_destroy(&hugetlbfs_backing_dev_info); 10751da177e4SLinus Torvalds return error; 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds static void __exit exit_hugetlbfs_fs(void) 10791da177e4SLinus Torvalds { 108042d7395fSAndi Kleen struct hstate *h; 108142d7395fSAndi Kleen int i; 108242d7395fSAndi Kleen 108342d7395fSAndi Kleen 10848c0a8537SKirill A. Shutemov /* 10858c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 10868c0a8537SKirill A. Shutemov * destroy cache. 10878c0a8537SKirill A. Shutemov */ 10888c0a8537SKirill A. Shutemov rcu_barrier(); 10891da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 109042d7395fSAndi Kleen i = 0; 109142d7395fSAndi Kleen for_each_hstate(h) 109242d7395fSAndi Kleen kern_unmount(hugetlbfs_vfsmount[i++]); 10931da177e4SLinus Torvalds unregister_filesystem(&hugetlbfs_fs_type); 1094e0bf68ddSPeter Zijlstra bdi_destroy(&hugetlbfs_backing_dev_info); 10951da177e4SLinus Torvalds } 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds module_init(init_hugetlbfs_fs) 10981da177e4SLinus Torvalds module_exit(exit_hugetlbfs_fs) 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1101