11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * hugetlbpage-backed filesystem. Based on ramfs. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * William Irwin, 2002 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 2002 Linus Torvalds. 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/module.h> 101da177e4SLinus Torvalds #include <linux/thread_info.h> 111da177e4SLinus Torvalds #include <asm/current.h> 121da177e4SLinus Torvalds #include <linux/sched.h> /* remove ASAP */ 131da177e4SLinus Torvalds #include <linux/fs.h> 141da177e4SLinus Torvalds #include <linux/mount.h> 151da177e4SLinus Torvalds #include <linux/file.h> 16e73a75faSRandy Dunlap #include <linux/kernel.h> 171da177e4SLinus Torvalds #include <linux/writeback.h> 181da177e4SLinus Torvalds #include <linux/pagemap.h> 191da177e4SLinus Torvalds #include <linux/highmem.h> 201da177e4SLinus Torvalds #include <linux/init.h> 211da177e4SLinus Torvalds #include <linux/string.h> 2216f7e0feSRandy Dunlap #include <linux/capability.h> 23e73a75faSRandy Dunlap #include <linux/ctype.h> 241da177e4SLinus Torvalds #include <linux/backing-dev.h> 251da177e4SLinus Torvalds #include <linux/hugetlb.h> 261da177e4SLinus Torvalds #include <linux/pagevec.h> 27e73a75faSRandy Dunlap #include <linux/parser.h> 28036e0856SBenjamin Herrenschmidt #include <linux/mman.h> 291da177e4SLinus Torvalds #include <linux/quotaops.h> 301da177e4SLinus Torvalds #include <linux/slab.h> 311da177e4SLinus Torvalds #include <linux/dnotify.h> 321da177e4SLinus Torvalds #include <linux/statfs.h> 331da177e4SLinus Torvalds #include <linux/security.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include <asm/uaccess.h> 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds /* some random number */ 381da177e4SLinus Torvalds #define HUGETLBFS_MAGIC 0x958458f6 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 461da177e4SLinus Torvalds static struct backing_dev_info hugetlbfs_backing_dev_info = { 471da177e4SLinus Torvalds .ra_pages = 0, /* No readahead */ 48e4ad08feSMiklos Szeredi .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, 491da177e4SLinus Torvalds }; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds int sysctl_hugetlb_shm_group; 521da177e4SLinus Torvalds 53e73a75faSRandy Dunlap enum { 54e73a75faSRandy Dunlap Opt_size, Opt_nr_inodes, 55e73a75faSRandy Dunlap Opt_mode, Opt_uid, Opt_gid, 56a137e1ccSAndi Kleen Opt_pagesize, 57e73a75faSRandy Dunlap Opt_err, 58e73a75faSRandy Dunlap }; 59e73a75faSRandy Dunlap 60a447c093SSteven Whitehouse static const match_table_t tokens = { 61e73a75faSRandy Dunlap {Opt_size, "size=%s"}, 62e73a75faSRandy Dunlap {Opt_nr_inodes, "nr_inodes=%s"}, 63e73a75faSRandy Dunlap {Opt_mode, "mode=%o"}, 64e73a75faSRandy Dunlap {Opt_uid, "uid=%u"}, 65e73a75faSRandy Dunlap {Opt_gid, "gid=%u"}, 66a137e1ccSAndi Kleen {Opt_pagesize, "pagesize=%s"}, 67e73a75faSRandy Dunlap {Opt_err, NULL}, 68e73a75faSRandy Dunlap }; 69e73a75faSRandy Dunlap 702e9b367cSAdam Litke static void huge_pagevec_release(struct pagevec *pvec) 712e9b367cSAdam Litke { 722e9b367cSAdam Litke int i; 732e9b367cSAdam Litke 742e9b367cSAdam Litke for (i = 0; i < pagevec_count(pvec); ++i) 752e9b367cSAdam Litke put_page(pvec->pages[i]); 762e9b367cSAdam Litke 772e9b367cSAdam Litke pagevec_reinit(pvec); 782e9b367cSAdam Litke } 792e9b367cSAdam Litke 801da177e4SLinus Torvalds static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) 811da177e4SLinus Torvalds { 82b39424e2SJosef Sipek struct inode *inode = file->f_path.dentry->d_inode; 831da177e4SLinus Torvalds loff_t len, vma_len; 841da177e4SLinus Torvalds int ret; 85a5516438SAndi Kleen struct hstate *h = hstate_file(file); 861da177e4SLinus Torvalds 8768589bc3SHugh Dickins /* 88dec4ad86SDavid Gibson * vma address alignment (but not the pgoff alignment) has 89dec4ad86SDavid Gibson * already been checked by prepare_hugepage_range. If you add 90dec4ad86SDavid Gibson * any error returns here, do so after setting VM_HUGETLB, so 91dec4ad86SDavid Gibson * is_vm_hugetlb_page tests below unmap_region go the right 92dec4ad86SDavid Gibson * way when do_mmap_pgoff unwinds (may be important on powerpc 93dec4ad86SDavid Gibson * and ia64). 9468589bc3SHugh Dickins */ 9568589bc3SHugh Dickins vma->vm_flags |= VM_HUGETLB | VM_RESERVED; 9668589bc3SHugh Dickins vma->vm_ops = &hugetlb_vm_ops; 971da177e4SLinus Torvalds 98a5516438SAndi Kleen if (vma->vm_pgoff & ~(huge_page_mask(h) >> PAGE_SHIFT)) 99dec4ad86SDavid Gibson return -EINVAL; 100dec4ad86SDavid Gibson 1011da177e4SLinus Torvalds vma_len = (loff_t)(vma->vm_end - vma->vm_start); 1021da177e4SLinus Torvalds 1031b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1041da177e4SLinus Torvalds file_accessed(file); 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds ret = -ENOMEM; 1071da177e4SLinus Torvalds len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 1081da177e4SLinus Torvalds 109a1e78772SMel Gorman if (hugetlb_reserve_pages(inode, 110a5516438SAndi Kleen vma->vm_pgoff >> huge_page_order(h), 1115a6fe125SMel Gorman len >> huge_page_shift(h), vma, 1125a6fe125SMel Gorman vma->vm_flags)) 113b45b5bd6SDavid Gibson goto out; 114b45b5bd6SDavid Gibson 1154c887265SAdam Litke ret = 0; 1164c887265SAdam Litke hugetlb_prefault_arch_hook(vma->vm_mm); 117b6174df5SZhang, Yanmin if (vma->vm_flags & VM_WRITE && inode->i_size < len) 1181da177e4SLinus Torvalds inode->i_size = len; 1191da177e4SLinus Torvalds out: 1201b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds return ret; 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* 126508034a3SHugh Dickins * Called under down_write(mmap_sem). 1271da177e4SLinus Torvalds */ 1281da177e4SLinus Torvalds 129d2ba27e8SAdrian Bunk #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 1301da177e4SLinus Torvalds static unsigned long 1311da177e4SLinus Torvalds hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 1321da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, unsigned long flags) 1331da177e4SLinus Torvalds { 1341da177e4SLinus Torvalds struct mm_struct *mm = current->mm; 1351da177e4SLinus Torvalds struct vm_area_struct *vma; 1361da177e4SLinus Torvalds unsigned long start_addr; 137a5516438SAndi Kleen struct hstate *h = hstate_file(file); 1381da177e4SLinus Torvalds 139a5516438SAndi Kleen if (len & ~huge_page_mask(h)) 1401da177e4SLinus Torvalds return -EINVAL; 1411da177e4SLinus Torvalds if (len > TASK_SIZE) 1421da177e4SLinus Torvalds return -ENOMEM; 1431da177e4SLinus Torvalds 144036e0856SBenjamin Herrenschmidt if (flags & MAP_FIXED) { 145a5516438SAndi Kleen if (prepare_hugepage_range(file, addr, len)) 146036e0856SBenjamin Herrenschmidt return -EINVAL; 147036e0856SBenjamin Herrenschmidt return addr; 148036e0856SBenjamin Herrenschmidt } 149036e0856SBenjamin Herrenschmidt 1501da177e4SLinus Torvalds if (addr) { 151a5516438SAndi Kleen addr = ALIGN(addr, huge_page_size(h)); 1521da177e4SLinus Torvalds vma = find_vma(mm, addr); 1531da177e4SLinus Torvalds if (TASK_SIZE - len >= addr && 1541da177e4SLinus Torvalds (!vma || addr + len <= vma->vm_start)) 1551da177e4SLinus Torvalds return addr; 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds start_addr = mm->free_area_cache; 1591da177e4SLinus Torvalds 1601363c3cdSWolfgang Wander if (len <= mm->cached_hole_size) 1611363c3cdSWolfgang Wander start_addr = TASK_UNMAPPED_BASE; 1621363c3cdSWolfgang Wander 1631da177e4SLinus Torvalds full_search: 164a5516438SAndi Kleen addr = ALIGN(start_addr, huge_page_size(h)); 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { 1671da177e4SLinus Torvalds /* At this point: (!vma || addr < vma->vm_end). */ 1681da177e4SLinus Torvalds if (TASK_SIZE - len < addr) { 1691da177e4SLinus Torvalds /* 1701da177e4SLinus Torvalds * Start a new search - just in case we missed 1711da177e4SLinus Torvalds * some holes. 1721da177e4SLinus Torvalds */ 1731da177e4SLinus Torvalds if (start_addr != TASK_UNMAPPED_BASE) { 1741da177e4SLinus Torvalds start_addr = TASK_UNMAPPED_BASE; 1751da177e4SLinus Torvalds goto full_search; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds return -ENOMEM; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds if (!vma || addr + len <= vma->vm_start) 1811da177e4SLinus Torvalds return addr; 182a5516438SAndi Kleen addr = ALIGN(vma->vm_end, huge_page_size(h)); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds #endif 1861da177e4SLinus Torvalds 187e63e1e5aSBadari Pulavarty static int 188e63e1e5aSBadari Pulavarty hugetlbfs_read_actor(struct page *page, unsigned long offset, 189e63e1e5aSBadari Pulavarty char __user *buf, unsigned long count, 190e63e1e5aSBadari Pulavarty unsigned long size) 191e63e1e5aSBadari Pulavarty { 192e63e1e5aSBadari Pulavarty char *kaddr; 193e63e1e5aSBadari Pulavarty unsigned long left, copied = 0; 194e63e1e5aSBadari Pulavarty int i, chunksize; 195e63e1e5aSBadari Pulavarty 196e63e1e5aSBadari Pulavarty if (size > count) 197e63e1e5aSBadari Pulavarty size = count; 198e63e1e5aSBadari Pulavarty 199e63e1e5aSBadari Pulavarty /* Find which 4k chunk and offset with in that chunk */ 200e63e1e5aSBadari Pulavarty i = offset >> PAGE_CACHE_SHIFT; 201e63e1e5aSBadari Pulavarty offset = offset & ~PAGE_CACHE_MASK; 202e63e1e5aSBadari Pulavarty 203e63e1e5aSBadari Pulavarty while (size) { 204e63e1e5aSBadari Pulavarty chunksize = PAGE_CACHE_SIZE; 205e63e1e5aSBadari Pulavarty if (offset) 206e63e1e5aSBadari Pulavarty chunksize -= offset; 207e63e1e5aSBadari Pulavarty if (chunksize > size) 208e63e1e5aSBadari Pulavarty chunksize = size; 209e63e1e5aSBadari Pulavarty kaddr = kmap(&page[i]); 210e63e1e5aSBadari Pulavarty left = __copy_to_user(buf, kaddr + offset, chunksize); 211e63e1e5aSBadari Pulavarty kunmap(&page[i]); 212e63e1e5aSBadari Pulavarty if (left) { 213e63e1e5aSBadari Pulavarty copied += (chunksize - left); 214e63e1e5aSBadari Pulavarty break; 215e63e1e5aSBadari Pulavarty } 216e63e1e5aSBadari Pulavarty offset = 0; 217e63e1e5aSBadari Pulavarty size -= chunksize; 218e63e1e5aSBadari Pulavarty buf += chunksize; 219e63e1e5aSBadari Pulavarty copied += chunksize; 220e63e1e5aSBadari Pulavarty i++; 221e63e1e5aSBadari Pulavarty } 222e63e1e5aSBadari Pulavarty return copied ? copied : -EFAULT; 223e63e1e5aSBadari Pulavarty } 224e63e1e5aSBadari Pulavarty 225e63e1e5aSBadari Pulavarty /* 226e63e1e5aSBadari Pulavarty * Support for read() - Find the page attached to f_mapping and copy out the 227e63e1e5aSBadari Pulavarty * data. Its *very* similar to do_generic_mapping_read(), we can't use that 228e63e1e5aSBadari Pulavarty * since it has PAGE_CACHE_SIZE assumptions. 229e63e1e5aSBadari Pulavarty */ 230e63e1e5aSBadari Pulavarty static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, 231e63e1e5aSBadari Pulavarty size_t len, loff_t *ppos) 232e63e1e5aSBadari Pulavarty { 233a5516438SAndi Kleen struct hstate *h = hstate_file(filp); 234e63e1e5aSBadari Pulavarty struct address_space *mapping = filp->f_mapping; 235e63e1e5aSBadari Pulavarty struct inode *inode = mapping->host; 236a5516438SAndi Kleen unsigned long index = *ppos >> huge_page_shift(h); 237a5516438SAndi Kleen unsigned long offset = *ppos & ~huge_page_mask(h); 238e63e1e5aSBadari Pulavarty unsigned long end_index; 239e63e1e5aSBadari Pulavarty loff_t isize; 240e63e1e5aSBadari Pulavarty ssize_t retval = 0; 241e63e1e5aSBadari Pulavarty 242e63e1e5aSBadari Pulavarty mutex_lock(&inode->i_mutex); 243e63e1e5aSBadari Pulavarty 244e63e1e5aSBadari Pulavarty /* validate length */ 245e63e1e5aSBadari Pulavarty if (len == 0) 246e63e1e5aSBadari Pulavarty goto out; 247e63e1e5aSBadari Pulavarty 248e63e1e5aSBadari Pulavarty isize = i_size_read(inode); 249e63e1e5aSBadari Pulavarty if (!isize) 250e63e1e5aSBadari Pulavarty goto out; 251e63e1e5aSBadari Pulavarty 252a5516438SAndi Kleen end_index = (isize - 1) >> huge_page_shift(h); 253e63e1e5aSBadari Pulavarty for (;;) { 254e63e1e5aSBadari Pulavarty struct page *page; 255a5516438SAndi Kleen unsigned long nr, ret; 25691bf189cSRoel Kluin int ra; 257e63e1e5aSBadari Pulavarty 258e63e1e5aSBadari Pulavarty /* nr is the maximum number of bytes to copy from this page */ 259a5516438SAndi Kleen nr = huge_page_size(h); 260e63e1e5aSBadari Pulavarty if (index >= end_index) { 261e63e1e5aSBadari Pulavarty if (index > end_index) 262e63e1e5aSBadari Pulavarty goto out; 263a5516438SAndi Kleen nr = ((isize - 1) & ~huge_page_mask(h)) + 1; 264e63e1e5aSBadari Pulavarty if (nr <= offset) { 265e63e1e5aSBadari Pulavarty goto out; 266e63e1e5aSBadari Pulavarty } 267e63e1e5aSBadari Pulavarty } 268e63e1e5aSBadari Pulavarty nr = nr - offset; 269e63e1e5aSBadari Pulavarty 270e63e1e5aSBadari Pulavarty /* Find the page */ 271e63e1e5aSBadari Pulavarty page = find_get_page(mapping, index); 272e63e1e5aSBadari Pulavarty if (unlikely(page == NULL)) { 273e63e1e5aSBadari Pulavarty /* 274e63e1e5aSBadari Pulavarty * We have a HOLE, zero out the user-buffer for the 275e63e1e5aSBadari Pulavarty * length of the hole or request. 276e63e1e5aSBadari Pulavarty */ 277e63e1e5aSBadari Pulavarty ret = len < nr ? len : nr; 278e63e1e5aSBadari Pulavarty if (clear_user(buf, ret)) 27991bf189cSRoel Kluin ra = -EFAULT; 28091bf189cSRoel Kluin else 28191bf189cSRoel Kluin ra = 0; 282e63e1e5aSBadari Pulavarty } else { 283e63e1e5aSBadari Pulavarty /* 284e63e1e5aSBadari Pulavarty * We have the page, copy it to user space buffer. 285e63e1e5aSBadari Pulavarty */ 28691bf189cSRoel Kluin ra = hugetlbfs_read_actor(page, offset, buf, len, nr); 28791bf189cSRoel Kluin ret = ra; 288e63e1e5aSBadari Pulavarty } 28991bf189cSRoel Kluin if (ra < 0) { 290e63e1e5aSBadari Pulavarty if (retval == 0) 29191bf189cSRoel Kluin retval = ra; 292e63e1e5aSBadari Pulavarty if (page) 293e63e1e5aSBadari Pulavarty page_cache_release(page); 294e63e1e5aSBadari Pulavarty goto out; 295e63e1e5aSBadari Pulavarty } 296e63e1e5aSBadari Pulavarty 297e63e1e5aSBadari Pulavarty offset += ret; 298e63e1e5aSBadari Pulavarty retval += ret; 299e63e1e5aSBadari Pulavarty len -= ret; 300a5516438SAndi Kleen index += offset >> huge_page_shift(h); 301a5516438SAndi Kleen offset &= ~huge_page_mask(h); 302e63e1e5aSBadari Pulavarty 303e63e1e5aSBadari Pulavarty if (page) 304e63e1e5aSBadari Pulavarty page_cache_release(page); 305e63e1e5aSBadari Pulavarty 306e63e1e5aSBadari Pulavarty /* short read or no more work */ 307e63e1e5aSBadari Pulavarty if ((ret != nr) || (len == 0)) 308e63e1e5aSBadari Pulavarty break; 309e63e1e5aSBadari Pulavarty } 310e63e1e5aSBadari Pulavarty out: 311a5516438SAndi Kleen *ppos = ((loff_t)index << huge_page_shift(h)) + offset; 312e63e1e5aSBadari Pulavarty mutex_unlock(&inode->i_mutex); 313e63e1e5aSBadari Pulavarty return retval; 314e63e1e5aSBadari Pulavarty } 315e63e1e5aSBadari Pulavarty 3161da177e4SLinus Torvalds /* 3171da177e4SLinus Torvalds * Read a page. Again trivial. If it didn't already exist 3181da177e4SLinus Torvalds * in the page cache, it is zero-filled. 3191da177e4SLinus Torvalds */ 3201da177e4SLinus Torvalds static int hugetlbfs_readpage(struct file *file, struct page * page) 3211da177e4SLinus Torvalds { 3221da177e4SLinus Torvalds unlock_page(page); 3231da177e4SLinus Torvalds return -EINVAL; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 326800d15a5SNick Piggin static int hugetlbfs_write_begin(struct file *file, 327800d15a5SNick Piggin struct address_space *mapping, 328800d15a5SNick Piggin loff_t pos, unsigned len, unsigned flags, 329800d15a5SNick Piggin struct page **pagep, void **fsdata) 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds return -EINVAL; 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 334800d15a5SNick Piggin static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, 335800d15a5SNick Piggin loff_t pos, unsigned len, unsigned copied, 336800d15a5SNick Piggin struct page *page, void *fsdata) 3371da177e4SLinus Torvalds { 338800d15a5SNick Piggin BUG(); 3391da177e4SLinus Torvalds return -EINVAL; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds static void truncate_huge_page(struct page *page) 3431da177e4SLinus Torvalds { 344fba2591bSLinus Torvalds cancel_dirty_page(page, /* No IO accounting for huge pages? */0); 3451da177e4SLinus Torvalds ClearPageUptodate(page); 3461da177e4SLinus Torvalds remove_from_page_cache(page); 3471da177e4SLinus Torvalds put_page(page); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 350b45b5bd6SDavid Gibson static void truncate_hugepages(struct inode *inode, loff_t lstart) 3511da177e4SLinus Torvalds { 352a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 353b45b5bd6SDavid Gibson struct address_space *mapping = &inode->i_data; 354a5516438SAndi Kleen const pgoff_t start = lstart >> huge_page_shift(h); 3551da177e4SLinus Torvalds struct pagevec pvec; 3561da177e4SLinus Torvalds pgoff_t next; 357a43a8c39SChen, Kenneth W int i, freed = 0; 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds pagevec_init(&pvec, 0); 3601da177e4SLinus Torvalds next = start; 3611da177e4SLinus Torvalds while (1) { 3621da177e4SLinus Torvalds if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 3631da177e4SLinus Torvalds if (next == start) 3641da177e4SLinus Torvalds break; 3651da177e4SLinus Torvalds next = start; 3661da177e4SLinus Torvalds continue; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); ++i) { 3701da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds lock_page(page); 3731da177e4SLinus Torvalds if (page->index > next) 3741da177e4SLinus Torvalds next = page->index; 3751da177e4SLinus Torvalds ++next; 3761da177e4SLinus Torvalds truncate_huge_page(page); 3771da177e4SLinus Torvalds unlock_page(page); 378a43a8c39SChen, Kenneth W freed++; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds huge_pagevec_release(&pvec); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds BUG_ON(!lstart && mapping->nrpages); 383a43a8c39SChen, Kenneth W hugetlb_unreserve_pages(inode, start, freed); 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds static void hugetlbfs_delete_inode(struct inode *inode) 3871da177e4SLinus Torvalds { 388b45b5bd6SDavid Gibson truncate_hugepages(inode, 0); 389149f4211SChristoph Hellwig clear_inode(inode); 390149f4211SChristoph Hellwig } 391149f4211SChristoph Hellwig 392ddc0a51dSJosh Triplett static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock) 3931da177e4SLinus Torvalds { 3940b1533f6SChristoph Hellwig struct super_block *sb = inode->i_sb; 3951da177e4SLinus Torvalds 3960b1533f6SChristoph Hellwig if (!hlist_unhashed(&inode->i_hash)) { 3971c0eeaf5SJoern Engel if (!(inode->i_state & (I_DIRTY|I_SYNC))) 3980b1533f6SChristoph Hellwig list_move(&inode->i_list, &inode_unused); 3991da177e4SLinus Torvalds inodes_stat.nr_unused++; 4000b1533f6SChristoph Hellwig if (!sb || (sb->s_flags & MS_ACTIVE)) { 4011da177e4SLinus Torvalds spin_unlock(&inode_lock); 4021da177e4SLinus Torvalds return; 4031da177e4SLinus Torvalds } 4040b1533f6SChristoph Hellwig inode->i_state |= I_WILL_FREE; 4050b1533f6SChristoph Hellwig spin_unlock(&inode_lock); 4060b1533f6SChristoph Hellwig /* 4070b1533f6SChristoph Hellwig * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK 4080b1533f6SChristoph Hellwig * in our backing_dev_info. 4090b1533f6SChristoph Hellwig */ 4100b1533f6SChristoph Hellwig write_inode_now(inode, 1); 4110b1533f6SChristoph Hellwig spin_lock(&inode_lock); 4120b1533f6SChristoph Hellwig inode->i_state &= ~I_WILL_FREE; 4131da177e4SLinus Torvalds inodes_stat.nr_unused--; 4141da177e4SLinus Torvalds hlist_del_init(&inode->i_hash); 4150b1533f6SChristoph Hellwig } 4161da177e4SLinus Torvalds list_del_init(&inode->i_list); 4171da177e4SLinus Torvalds list_del_init(&inode->i_sb_list); 4181da177e4SLinus Torvalds inode->i_state |= I_FREEING; 4191da177e4SLinus Torvalds inodes_stat.nr_inodes--; 4201da177e4SLinus Torvalds spin_unlock(&inode_lock); 421b45b5bd6SDavid Gibson truncate_hugepages(inode, 0); 4221da177e4SLinus Torvalds clear_inode(inode); 4231da177e4SLinus Torvalds destroy_inode(inode); 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds static void hugetlbfs_drop_inode(struct inode *inode) 4271da177e4SLinus Torvalds { 4281da177e4SLinus Torvalds if (!inode->i_nlink) 4296b09b9dfSChristoph Hellwig generic_delete_inode(inode); 4301da177e4SLinus Torvalds else 4311da177e4SLinus Torvalds hugetlbfs_forget_inode(inode); 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds static inline void 435856fc295SHugh Dickins hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) 4361da177e4SLinus Torvalds { 4371da177e4SLinus Torvalds struct vm_area_struct *vma; 4381da177e4SLinus Torvalds struct prio_tree_iter iter; 4391da177e4SLinus Torvalds 440856fc295SHugh Dickins vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { 4411da177e4SLinus Torvalds unsigned long v_offset; 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 444856fc295SHugh Dickins * Can the expression below overflow on 32-bit arches? 445856fc295SHugh Dickins * No, because the prio_tree returns us only those vmas 446856fc295SHugh Dickins * which overlap the truncated area starting at pgoff, 447856fc295SHugh Dickins * and no vma on a 32-bit arch can span beyond the 4GB. 4481da177e4SLinus Torvalds */ 449856fc295SHugh Dickins if (vma->vm_pgoff < pgoff) 450856fc295SHugh Dickins v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; 451856fc295SHugh Dickins else 4521da177e4SLinus Torvalds v_offset = 0; 4531da177e4SLinus Torvalds 454502717f4SChen, Kenneth W __unmap_hugepage_range(vma, 45504f2cbe3SMel Gorman vma->vm_start + v_offset, vma->vm_end, NULL); 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) 4601da177e4SLinus Torvalds { 461856fc295SHugh Dickins pgoff_t pgoff; 4621da177e4SLinus Torvalds struct address_space *mapping = inode->i_mapping; 463a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 4641da177e4SLinus Torvalds 465a5516438SAndi Kleen BUG_ON(offset & ~huge_page_mask(h)); 466856fc295SHugh Dickins pgoff = offset >> PAGE_SHIFT; 4671da177e4SLinus Torvalds 4687aa91e10SKen Chen i_size_write(inode, offset); 4691da177e4SLinus Torvalds spin_lock(&mapping->i_mmap_lock); 4701da177e4SLinus Torvalds if (!prio_tree_empty(&mapping->i_mmap)) 4711da177e4SLinus Torvalds hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); 4721da177e4SLinus Torvalds spin_unlock(&mapping->i_mmap_lock); 473b45b5bd6SDavid Gibson truncate_hugepages(inode, offset); 4741da177e4SLinus Torvalds return 0; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) 4781da177e4SLinus Torvalds { 4791da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 480a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 4811da177e4SLinus Torvalds int error; 4821da177e4SLinus Torvalds unsigned int ia_valid = attr->ia_valid; 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds BUG_ON(!inode); 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds error = inode_change_ok(inode, attr); 4871da177e4SLinus Torvalds if (error) 4881da177e4SLinus Torvalds goto out; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds if (ia_valid & ATTR_SIZE) { 4911da177e4SLinus Torvalds error = -EINVAL; 492a5516438SAndi Kleen if (!(attr->ia_size & ~huge_page_mask(h))) 4931da177e4SLinus Torvalds error = hugetlb_vmtruncate(inode, attr->ia_size); 4941da177e4SLinus Torvalds if (error) 4951da177e4SLinus Torvalds goto out; 4961da177e4SLinus Torvalds attr->ia_valid &= ~ATTR_SIZE; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds error = inode_setattr(inode, attr); 4991da177e4SLinus Torvalds out: 5001da177e4SLinus Torvalds return error; 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, 5041da177e4SLinus Torvalds gid_t gid, int mode, dev_t dev) 5051da177e4SLinus Torvalds { 5061da177e4SLinus Torvalds struct inode *inode; 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds inode = new_inode(sb); 5091da177e4SLinus Torvalds if (inode) { 5101da177e4SLinus Torvalds struct hugetlbfs_inode_info *info; 5111da177e4SLinus Torvalds inode->i_mode = mode; 5121da177e4SLinus Torvalds inode->i_uid = uid; 5131da177e4SLinus Torvalds inode->i_gid = gid; 5141da177e4SLinus Torvalds inode->i_mapping->a_ops = &hugetlbfs_aops; 5151da177e4SLinus Torvalds inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; 5161da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 517a43a8c39SChen, Kenneth W INIT_LIST_HEAD(&inode->i_mapping->private_list); 5181da177e4SLinus Torvalds info = HUGETLBFS_I(inode); 51971fe804bSLee Schermerhorn mpol_shared_policy_init(&info->policy, NULL); 5201da177e4SLinus Torvalds switch (mode & S_IFMT) { 5211da177e4SLinus Torvalds default: 5221da177e4SLinus Torvalds init_special_inode(inode, mode, dev); 5231da177e4SLinus Torvalds break; 5241da177e4SLinus Torvalds case S_IFREG: 5251da177e4SLinus Torvalds inode->i_op = &hugetlbfs_inode_operations; 5261da177e4SLinus Torvalds inode->i_fop = &hugetlbfs_file_operations; 5271da177e4SLinus Torvalds break; 5281da177e4SLinus Torvalds case S_IFDIR: 5291da177e4SLinus Torvalds inode->i_op = &hugetlbfs_dir_inode_operations; 5301da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds /* directory inodes start off with i_nlink == 2 (for "." entry) */ 533d8c76e6fSDave Hansen inc_nlink(inode); 5341da177e4SLinus Torvalds break; 5351da177e4SLinus Torvalds case S_IFLNK: 5361da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 5371da177e4SLinus Torvalds break; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds return inode; 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds /* 5441da177e4SLinus Torvalds * File creation. Allocate an inode, and we're done.. 5451da177e4SLinus Torvalds */ 5461da177e4SLinus Torvalds static int hugetlbfs_mknod(struct inode *dir, 5471da177e4SLinus Torvalds struct dentry *dentry, int mode, dev_t dev) 5481da177e4SLinus Torvalds { 5491da177e4SLinus Torvalds struct inode *inode; 5501da177e4SLinus Torvalds int error = -ENOSPC; 5511da177e4SLinus Torvalds gid_t gid; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds if (dir->i_mode & S_ISGID) { 5541da177e4SLinus Torvalds gid = dir->i_gid; 5551da177e4SLinus Torvalds if (S_ISDIR(mode)) 5561da177e4SLinus Torvalds mode |= S_ISGID; 5571da177e4SLinus Torvalds } else { 55877c70de1SDavid Howells gid = current_fsgid(); 5591da177e4SLinus Torvalds } 56077c70de1SDavid Howells inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev); 5611da177e4SLinus Torvalds if (inode) { 5621da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5631da177e4SLinus Torvalds d_instantiate(dentry, inode); 5641da177e4SLinus Torvalds dget(dentry); /* Extra count - pin the dentry in core */ 5651da177e4SLinus Torvalds error = 0; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds return error; 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 5711da177e4SLinus Torvalds { 5721da177e4SLinus Torvalds int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); 5731da177e4SLinus Torvalds if (!retval) 574d8c76e6fSDave Hansen inc_nlink(dir); 5751da177e4SLinus Torvalds return retval; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) 5791da177e4SLinus Torvalds { 5801da177e4SLinus Torvalds return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds static int hugetlbfs_symlink(struct inode *dir, 5841da177e4SLinus Torvalds struct dentry *dentry, const char *symname) 5851da177e4SLinus Torvalds { 5861da177e4SLinus Torvalds struct inode *inode; 5871da177e4SLinus Torvalds int error = -ENOSPC; 5881da177e4SLinus Torvalds gid_t gid; 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds if (dir->i_mode & S_ISGID) 5911da177e4SLinus Torvalds gid = dir->i_gid; 5921da177e4SLinus Torvalds else 59377c70de1SDavid Howells gid = current_fsgid(); 5941da177e4SLinus Torvalds 59577c70de1SDavid Howells inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), 5961da177e4SLinus Torvalds gid, S_IFLNK|S_IRWXUGO, 0); 5971da177e4SLinus Torvalds if (inode) { 5981da177e4SLinus Torvalds int l = strlen(symname)+1; 5991da177e4SLinus Torvalds error = page_symlink(inode, symname, l); 6001da177e4SLinus Torvalds if (!error) { 6011da177e4SLinus Torvalds d_instantiate(dentry, inode); 6021da177e4SLinus Torvalds dget(dentry); 6031da177e4SLinus Torvalds } else 6041da177e4SLinus Torvalds iput(inode); 6051da177e4SLinus Torvalds } 6061da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds return error; 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds /* 6126649a386SKen Chen * mark the head page dirty 6131da177e4SLinus Torvalds */ 6141da177e4SLinus Torvalds static int hugetlbfs_set_page_dirty(struct page *page) 6151da177e4SLinus Torvalds { 616d85f3385SChristoph Lameter struct page *head = compound_head(page); 6176649a386SKen Chen 6186649a386SKen Chen SetPageDirty(head); 6191da177e4SLinus Torvalds return 0; 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds 622726c3342SDavid Howells static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) 6231da177e4SLinus Torvalds { 624726c3342SDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); 625a5516438SAndi Kleen struct hstate *h = hstate_inode(dentry->d_inode); 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds buf->f_type = HUGETLBFS_MAGIC; 628a5516438SAndi Kleen buf->f_bsize = huge_page_size(h); 6291da177e4SLinus Torvalds if (sbinfo) { 6301da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 63174a8a65cSDavid Gibson /* If no limits set, just report 0 for max/free/used 63274a8a65cSDavid Gibson * blocks, like simple_statfs() */ 63374a8a65cSDavid Gibson if (sbinfo->max_blocks >= 0) { 6341da177e4SLinus Torvalds buf->f_blocks = sbinfo->max_blocks; 6351da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; 6361da177e4SLinus Torvalds buf->f_files = sbinfo->max_inodes; 6371da177e4SLinus Torvalds buf->f_ffree = sbinfo->free_inodes; 63874a8a65cSDavid Gibson } 6391da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds buf->f_namelen = NAME_MAX; 6421da177e4SLinus Torvalds return 0; 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds static void hugetlbfs_put_super(struct super_block *sb) 6461da177e4SLinus Torvalds { 6471da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds if (sbi) { 6501da177e4SLinus Torvalds sb->s_fs_info = NULL; 6511da177e4SLinus Torvalds kfree(sbi); 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 65596527980SChristoph Hellwig static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) 65696527980SChristoph Hellwig { 65796527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 65896527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 65996527980SChristoph Hellwig if (unlikely(!sbinfo->free_inodes)) { 66096527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 66196527980SChristoph Hellwig return 0; 66296527980SChristoph Hellwig } 66396527980SChristoph Hellwig sbinfo->free_inodes--; 66496527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 66596527980SChristoph Hellwig } 66696527980SChristoph Hellwig 66796527980SChristoph Hellwig return 1; 66896527980SChristoph Hellwig } 66996527980SChristoph Hellwig 67096527980SChristoph Hellwig static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) 67196527980SChristoph Hellwig { 67296527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 67396527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 67496527980SChristoph Hellwig sbinfo->free_inodes++; 67596527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 67696527980SChristoph Hellwig } 67796527980SChristoph Hellwig } 67896527980SChristoph Hellwig 67996527980SChristoph Hellwig 680e18b890bSChristoph Lameter static struct kmem_cache *hugetlbfs_inode_cachep; 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) 6831da177e4SLinus Torvalds { 68496527980SChristoph Hellwig struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); 6851da177e4SLinus Torvalds struct hugetlbfs_inode_info *p; 6861da177e4SLinus Torvalds 68796527980SChristoph Hellwig if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) 6881da177e4SLinus Torvalds return NULL; 689e94b1766SChristoph Lameter p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); 69096527980SChristoph Hellwig if (unlikely(!p)) { 69196527980SChristoph Hellwig hugetlbfs_inc_free_inodes(sbinfo); 69296527980SChristoph Hellwig return NULL; 6931da177e4SLinus Torvalds } 69496527980SChristoph Hellwig return &p->vfs_inode; 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds static void hugetlbfs_destroy_inode(struct inode *inode) 6981da177e4SLinus Torvalds { 69996527980SChristoph Hellwig hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); 7001da177e4SLinus Torvalds mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); 7011da177e4SLinus Torvalds kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 704f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops = { 7051da177e4SLinus Torvalds .readpage = hugetlbfs_readpage, 706800d15a5SNick Piggin .write_begin = hugetlbfs_write_begin, 707800d15a5SNick Piggin .write_end = hugetlbfs_write_end, 7081da177e4SLinus Torvalds .set_page_dirty = hugetlbfs_set_page_dirty, 7091da177e4SLinus Torvalds }; 7101da177e4SLinus Torvalds 71196527980SChristoph Hellwig 71251cc5068SAlexey Dobriyan static void init_once(void *foo) 71396527980SChristoph Hellwig { 71496527980SChristoph Hellwig struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; 71596527980SChristoph Hellwig 71696527980SChristoph Hellwig inode_init_once(&ei->vfs_inode); 71796527980SChristoph Hellwig } 71896527980SChristoph Hellwig 7194b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations = { 720e63e1e5aSBadari Pulavarty .read = hugetlbfs_read, 7211da177e4SLinus Torvalds .mmap = hugetlbfs_file_mmap, 7221da177e4SLinus Torvalds .fsync = simple_sync_file, 7231da177e4SLinus Torvalds .get_unmapped_area = hugetlb_get_unmapped_area, 7241da177e4SLinus Torvalds }; 7251da177e4SLinus Torvalds 72692e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations = { 7271da177e4SLinus Torvalds .create = hugetlbfs_create, 7281da177e4SLinus Torvalds .lookup = simple_lookup, 7291da177e4SLinus Torvalds .link = simple_link, 7301da177e4SLinus Torvalds .unlink = simple_unlink, 7311da177e4SLinus Torvalds .symlink = hugetlbfs_symlink, 7321da177e4SLinus Torvalds .mkdir = hugetlbfs_mkdir, 7331da177e4SLinus Torvalds .rmdir = simple_rmdir, 7341da177e4SLinus Torvalds .mknod = hugetlbfs_mknod, 7351da177e4SLinus Torvalds .rename = simple_rename, 7361da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7371da177e4SLinus Torvalds }; 7381da177e4SLinus Torvalds 73992e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations = { 7401da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7411da177e4SLinus Torvalds }; 7421da177e4SLinus Torvalds 743ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops = { 7441da177e4SLinus Torvalds .alloc_inode = hugetlbfs_alloc_inode, 7451da177e4SLinus Torvalds .destroy_inode = hugetlbfs_destroy_inode, 7461da177e4SLinus Torvalds .statfs = hugetlbfs_statfs, 747149f4211SChristoph Hellwig .delete_inode = hugetlbfs_delete_inode, 7481da177e4SLinus Torvalds .drop_inode = hugetlbfs_drop_inode, 7491da177e4SLinus Torvalds .put_super = hugetlbfs_put_super, 75010f19a86SMiklos Szeredi .show_options = generic_show_options, 7511da177e4SLinus Torvalds }; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds static int 7541da177e4SLinus Torvalds hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 7551da177e4SLinus Torvalds { 756e73a75faSRandy Dunlap char *p, *rest; 757e73a75faSRandy Dunlap substring_t args[MAX_OPT_ARGS]; 758e73a75faSRandy Dunlap int option; 759a137e1ccSAndi Kleen unsigned long long size = 0; 760a137e1ccSAndi Kleen enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds if (!options) 7631da177e4SLinus Torvalds return 0; 7641da177e4SLinus Torvalds 765e73a75faSRandy Dunlap while ((p = strsep(&options, ",")) != NULL) { 766e73a75faSRandy Dunlap int token; 767b4c07bceSLee Schermerhorn if (!*p) 768b4c07bceSLee Schermerhorn continue; 7691da177e4SLinus Torvalds 770e73a75faSRandy Dunlap token = match_token(p, tokens, args); 771e73a75faSRandy Dunlap switch (token) { 772e73a75faSRandy Dunlap case Opt_uid: 773e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 774e73a75faSRandy Dunlap goto bad_val; 775e73a75faSRandy Dunlap pconfig->uid = option; 776e73a75faSRandy Dunlap break; 777e73a75faSRandy Dunlap 778e73a75faSRandy Dunlap case Opt_gid: 779e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 780e73a75faSRandy Dunlap goto bad_val; 781e73a75faSRandy Dunlap pconfig->gid = option; 782e73a75faSRandy Dunlap break; 783e73a75faSRandy Dunlap 784e73a75faSRandy Dunlap case Opt_mode: 785e73a75faSRandy Dunlap if (match_octal(&args[0], &option)) 786e73a75faSRandy Dunlap goto bad_val; 78775897d60SKen Chen pconfig->mode = option & 01777U; 788e73a75faSRandy Dunlap break; 789e73a75faSRandy Dunlap 790e73a75faSRandy Dunlap case Opt_size: { 791e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 792e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 793e73a75faSRandy Dunlap goto bad_val; 794e73a75faSRandy Dunlap size = memparse(args[0].from, &rest); 795a137e1ccSAndi Kleen setsize = SIZE_STD; 796a137e1ccSAndi Kleen if (*rest == '%') 797a137e1ccSAndi Kleen setsize = SIZE_PERCENT; 798e73a75faSRandy Dunlap break; 799e73a75faSRandy Dunlap } 8001da177e4SLinus Torvalds 801e73a75faSRandy Dunlap case Opt_nr_inodes: 802e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 803e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 804e73a75faSRandy Dunlap goto bad_val; 805e73a75faSRandy Dunlap pconfig->nr_inodes = memparse(args[0].from, &rest); 806e73a75faSRandy Dunlap break; 807e73a75faSRandy Dunlap 808a137e1ccSAndi Kleen case Opt_pagesize: { 809a137e1ccSAndi Kleen unsigned long ps; 810a137e1ccSAndi Kleen ps = memparse(args[0].from, &rest); 811a137e1ccSAndi Kleen pconfig->hstate = size_to_hstate(ps); 812a137e1ccSAndi Kleen if (!pconfig->hstate) { 813a137e1ccSAndi Kleen printk(KERN_ERR 814a137e1ccSAndi Kleen "hugetlbfs: Unsupported page size %lu MB\n", 815a137e1ccSAndi Kleen ps >> 20); 816a137e1ccSAndi Kleen return -EINVAL; 817a137e1ccSAndi Kleen } 818a137e1ccSAndi Kleen break; 819a137e1ccSAndi Kleen } 820a137e1ccSAndi Kleen 821e73a75faSRandy Dunlap default: 822b4c07bceSLee Schermerhorn printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", 823b4c07bceSLee Schermerhorn p); 824b4c07bceSLee Schermerhorn return -EINVAL; 825e73a75faSRandy Dunlap break; 826e73a75faSRandy Dunlap } 8271da177e4SLinus Torvalds } 828a137e1ccSAndi Kleen 829a137e1ccSAndi Kleen /* Do size after hstate is set up */ 830a137e1ccSAndi Kleen if (setsize > NO_SIZE) { 831a137e1ccSAndi Kleen struct hstate *h = pconfig->hstate; 832a137e1ccSAndi Kleen if (setsize == SIZE_PERCENT) { 833a137e1ccSAndi Kleen size <<= huge_page_shift(h); 834a137e1ccSAndi Kleen size *= h->max_huge_pages; 835a137e1ccSAndi Kleen do_div(size, 100); 836a137e1ccSAndi Kleen } 837a137e1ccSAndi Kleen pconfig->nr_blocks = (size >> huge_page_shift(h)); 838a137e1ccSAndi Kleen } 839a137e1ccSAndi Kleen 8401da177e4SLinus Torvalds return 0; 841e73a75faSRandy Dunlap 842e73a75faSRandy Dunlap bad_val: 843e73a75faSRandy Dunlap printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", 844e73a75faSRandy Dunlap args[0].from, p); 845e73a75faSRandy Dunlap return 1; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds static int 8491da177e4SLinus Torvalds hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 8501da177e4SLinus Torvalds { 8511da177e4SLinus Torvalds struct inode * inode; 8521da177e4SLinus Torvalds struct dentry * root; 8531da177e4SLinus Torvalds int ret; 8541da177e4SLinus Torvalds struct hugetlbfs_config config; 8551da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo; 8561da177e4SLinus Torvalds 85710f19a86SMiklos Szeredi save_mount_options(sb, data); 85810f19a86SMiklos Szeredi 8591da177e4SLinus Torvalds config.nr_blocks = -1; /* No limit on size by default */ 8601da177e4SLinus Torvalds config.nr_inodes = -1; /* No limit on number of inodes by default */ 86177c70de1SDavid Howells config.uid = current_fsuid(); 86277c70de1SDavid Howells config.gid = current_fsgid(); 8631da177e4SLinus Torvalds config.mode = 0755; 864a137e1ccSAndi Kleen config.hstate = &default_hstate; 8651da177e4SLinus Torvalds ret = hugetlbfs_parse_options(data, &config); 8661da177e4SLinus Torvalds if (ret) 8671da177e4SLinus Torvalds return ret; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); 8701da177e4SLinus Torvalds if (!sbinfo) 8711da177e4SLinus Torvalds return -ENOMEM; 8721da177e4SLinus Torvalds sb->s_fs_info = sbinfo; 873a137e1ccSAndi Kleen sbinfo->hstate = config.hstate; 8741da177e4SLinus Torvalds spin_lock_init(&sbinfo->stat_lock); 8751da177e4SLinus Torvalds sbinfo->max_blocks = config.nr_blocks; 8761da177e4SLinus Torvalds sbinfo->free_blocks = config.nr_blocks; 8771da177e4SLinus Torvalds sbinfo->max_inodes = config.nr_inodes; 8781da177e4SLinus Torvalds sbinfo->free_inodes = config.nr_inodes; 8791da177e4SLinus Torvalds sb->s_maxbytes = MAX_LFS_FILESIZE; 880a137e1ccSAndi Kleen sb->s_blocksize = huge_page_size(config.hstate); 881a137e1ccSAndi Kleen sb->s_blocksize_bits = huge_page_shift(config.hstate); 8821da177e4SLinus Torvalds sb->s_magic = HUGETLBFS_MAGIC; 8831da177e4SLinus Torvalds sb->s_op = &hugetlbfs_ops; 8841da177e4SLinus Torvalds sb->s_time_gran = 1; 8851da177e4SLinus Torvalds inode = hugetlbfs_get_inode(sb, config.uid, config.gid, 8861da177e4SLinus Torvalds S_IFDIR | config.mode, 0); 8871da177e4SLinus Torvalds if (!inode) 8881da177e4SLinus Torvalds goto out_free; 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds root = d_alloc_root(inode); 8911da177e4SLinus Torvalds if (!root) { 8921da177e4SLinus Torvalds iput(inode); 8931da177e4SLinus Torvalds goto out_free; 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds sb->s_root = root; 8961da177e4SLinus Torvalds return 0; 8971da177e4SLinus Torvalds out_free: 8981da177e4SLinus Torvalds kfree(sbinfo); 8991da177e4SLinus Torvalds return -ENOMEM; 9001da177e4SLinus Torvalds } 9011da177e4SLinus Torvalds 9029a119c05SAdam Litke int hugetlb_get_quota(struct address_space *mapping, long delta) 9031da177e4SLinus Torvalds { 9041da177e4SLinus Torvalds int ret = 0; 9051da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds if (sbinfo->free_blocks > -1) { 9081da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 9099a119c05SAdam Litke if (sbinfo->free_blocks - delta >= 0) 9109a119c05SAdam Litke sbinfo->free_blocks -= delta; 9111da177e4SLinus Torvalds else 9121da177e4SLinus Torvalds ret = -ENOMEM; 9131da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds return ret; 9171da177e4SLinus Torvalds } 9181da177e4SLinus Torvalds 9199a119c05SAdam Litke void hugetlb_put_quota(struct address_space *mapping, long delta) 9201da177e4SLinus Torvalds { 9211da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds if (sbinfo->free_blocks > -1) { 9241da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 9259a119c05SAdam Litke sbinfo->free_blocks += delta; 9261da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 930454e2398SDavid Howells static int hugetlbfs_get_sb(struct file_system_type *fs_type, 931454e2398SDavid Howells int flags, const char *dev_name, void *data, struct vfsmount *mnt) 9321da177e4SLinus Torvalds { 933454e2398SDavid Howells return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds static struct file_system_type hugetlbfs_fs_type = { 9371da177e4SLinus Torvalds .name = "hugetlbfs", 9381da177e4SLinus Torvalds .get_sb = hugetlbfs_get_sb, 9391da177e4SLinus Torvalds .kill_sb = kill_litter_super, 9401da177e4SLinus Torvalds }; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds static struct vfsmount *hugetlbfs_vfsmount; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds static int can_do_hugetlb_shm(void) 9451da177e4SLinus Torvalds { 9461da177e4SLinus Torvalds return likely(capable(CAP_IPC_LOCK) || 9471da177e4SLinus Torvalds in_group_p(sysctl_hugetlb_shm_group) || 9481da177e4SLinus Torvalds can_do_mlock()); 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds 9515a6fe125SMel Gorman struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag) 9521da177e4SLinus Torvalds { 9531da177e4SLinus Torvalds int error = -ENOMEM; 9541da177e4SLinus Torvalds struct file *file; 9551da177e4SLinus Torvalds struct inode *inode; 9561da177e4SLinus Torvalds struct dentry *dentry, *root; 9571da177e4SLinus Torvalds struct qstr quick_string; 95886a264abSDavid Howells struct user_struct *user = current_user(); 9591da177e4SLinus Torvalds 9605bc98594SAkinobu Mita if (!hugetlbfs_vfsmount) 9615bc98594SAkinobu Mita return ERR_PTR(-ENOENT); 9625bc98594SAkinobu Mita 9631da177e4SLinus Torvalds if (!can_do_hugetlb_shm()) 9641da177e4SLinus Torvalds return ERR_PTR(-EPERM); 9651da177e4SLinus Torvalds 96686a264abSDavid Howells if (!user_shm_lock(size, user)) 9671da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds root = hugetlbfs_vfsmount->mnt_root; 9709d66586fSEric W. Biederman quick_string.name = name; 9711da177e4SLinus Torvalds quick_string.len = strlen(quick_string.name); 9721da177e4SLinus Torvalds quick_string.hash = 0; 9731da177e4SLinus Torvalds dentry = d_alloc(root, &quick_string); 9741da177e4SLinus Torvalds if (!dentry) 9751da177e4SLinus Torvalds goto out_shm_unlock; 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds error = -ENOSPC; 97877c70de1SDavid Howells inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(), 97977c70de1SDavid Howells current_fsgid(), S_IFREG | S_IRWXUGO, 0); 9801da177e4SLinus Torvalds if (!inode) 981ce8d2cdfSDave Hansen goto out_dentry; 9821da177e4SLinus Torvalds 983b45b5bd6SDavid Gibson error = -ENOMEM; 984a5516438SAndi Kleen if (hugetlb_reserve_pages(inode, 0, 9855a6fe125SMel Gorman size >> huge_page_shift(hstate_inode(inode)), NULL, 9865a6fe125SMel Gorman acctflag)) 987b45b5bd6SDavid Gibson goto out_inode; 988b45b5bd6SDavid Gibson 9891da177e4SLinus Torvalds d_instantiate(dentry, inode); 9901da177e4SLinus Torvalds inode->i_size = size; 9911da177e4SLinus Torvalds inode->i_nlink = 0; 992ce8d2cdfSDave Hansen 993ce8d2cdfSDave Hansen error = -ENFILE; 994ce8d2cdfSDave Hansen file = alloc_file(hugetlbfs_vfsmount, dentry, 995ce8d2cdfSDave Hansen FMODE_WRITE | FMODE_READ, 996ce8d2cdfSDave Hansen &hugetlbfs_file_operations); 997ce8d2cdfSDave Hansen if (!file) 998b4d232e6SAl Viro goto out_dentry; /* inode is already attached */ 999ce8d2cdfSDave Hansen 10001da177e4SLinus Torvalds return file; 10011da177e4SLinus Torvalds 1002b45b5bd6SDavid Gibson out_inode: 1003b45b5bd6SDavid Gibson iput(inode); 10041da177e4SLinus Torvalds out_dentry: 10051da177e4SLinus Torvalds dput(dentry); 10061da177e4SLinus Torvalds out_shm_unlock: 100786a264abSDavid Howells user_shm_unlock(size, user); 10081da177e4SLinus Torvalds return ERR_PTR(error); 10091da177e4SLinus Torvalds } 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds static int __init init_hugetlbfs_fs(void) 10121da177e4SLinus Torvalds { 10131da177e4SLinus Torvalds int error; 10141da177e4SLinus Torvalds struct vfsmount *vfsmount; 10151da177e4SLinus Torvalds 1016e0bf68ddSPeter Zijlstra error = bdi_init(&hugetlbfs_backing_dev_info); 1017e0bf68ddSPeter Zijlstra if (error) 1018e0bf68ddSPeter Zijlstra return error; 1019e0bf68ddSPeter Zijlstra 10201da177e4SLinus Torvalds hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", 10211da177e4SLinus Torvalds sizeof(struct hugetlbfs_inode_info), 102220c2df83SPaul Mundt 0, 0, init_once); 10231da177e4SLinus Torvalds if (hugetlbfs_inode_cachep == NULL) 1024e0bf68ddSPeter Zijlstra goto out2; 10251da177e4SLinus Torvalds 10261da177e4SLinus Torvalds error = register_filesystem(&hugetlbfs_fs_type); 10271da177e4SLinus Torvalds if (error) 10281da177e4SLinus Torvalds goto out; 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds vfsmount = kern_mount(&hugetlbfs_fs_type); 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds if (!IS_ERR(vfsmount)) { 10331da177e4SLinus Torvalds hugetlbfs_vfsmount = vfsmount; 10341da177e4SLinus Torvalds return 0; 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds error = PTR_ERR(vfsmount); 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds out: 10401da177e4SLinus Torvalds if (error) 10411da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 1042e0bf68ddSPeter Zijlstra out2: 1043e0bf68ddSPeter Zijlstra bdi_destroy(&hugetlbfs_backing_dev_info); 10441da177e4SLinus Torvalds return error; 10451da177e4SLinus Torvalds } 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds static void __exit exit_hugetlbfs_fs(void) 10481da177e4SLinus Torvalds { 10491da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 10501da177e4SLinus Torvalds unregister_filesystem(&hugetlbfs_fs_type); 1051e0bf68ddSPeter Zijlstra bdi_destroy(&hugetlbfs_backing_dev_info); 10521da177e4SLinus Torvalds } 10531da177e4SLinus Torvalds 10541da177e4SLinus Torvalds module_init(init_hugetlbfs_fs) 10551da177e4SLinus Torvalds module_exit(exit_hugetlbfs_fs) 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1058