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 */ 481da177e4SLinus Torvalds .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_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, 56e73a75faSRandy Dunlap Opt_err, 57e73a75faSRandy Dunlap }; 58e73a75faSRandy Dunlap 59e73a75faSRandy Dunlap static match_table_t tokens = { 60e73a75faSRandy Dunlap {Opt_size, "size=%s"}, 61e73a75faSRandy Dunlap {Opt_nr_inodes, "nr_inodes=%s"}, 62e73a75faSRandy Dunlap {Opt_mode, "mode=%o"}, 63e73a75faSRandy Dunlap {Opt_uid, "uid=%u"}, 64e73a75faSRandy Dunlap {Opt_gid, "gid=%u"}, 65e73a75faSRandy Dunlap {Opt_err, NULL}, 66e73a75faSRandy Dunlap }; 67e73a75faSRandy Dunlap 682e9b367cSAdam Litke static void huge_pagevec_release(struct pagevec *pvec) 692e9b367cSAdam Litke { 702e9b367cSAdam Litke int i; 712e9b367cSAdam Litke 722e9b367cSAdam Litke for (i = 0; i < pagevec_count(pvec); ++i) 732e9b367cSAdam Litke put_page(pvec->pages[i]); 742e9b367cSAdam Litke 752e9b367cSAdam Litke pagevec_reinit(pvec); 762e9b367cSAdam Litke } 772e9b367cSAdam Litke 781da177e4SLinus Torvalds static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) 791da177e4SLinus Torvalds { 80b39424e2SJosef Sipek struct inode *inode = file->f_path.dentry->d_inode; 811da177e4SLinus Torvalds loff_t len, vma_len; 821da177e4SLinus Torvalds int ret; 831da177e4SLinus Torvalds 8468589bc3SHugh Dickins /* 85dec4ad86SDavid Gibson * vma address alignment (but not the pgoff alignment) has 86dec4ad86SDavid Gibson * already been checked by prepare_hugepage_range. If you add 87dec4ad86SDavid Gibson * any error returns here, do so after setting VM_HUGETLB, so 88dec4ad86SDavid Gibson * is_vm_hugetlb_page tests below unmap_region go the right 89dec4ad86SDavid Gibson * way when do_mmap_pgoff unwinds (may be important on powerpc 90dec4ad86SDavid Gibson * and ia64). 9168589bc3SHugh Dickins */ 9268589bc3SHugh Dickins vma->vm_flags |= VM_HUGETLB | VM_RESERVED; 9368589bc3SHugh Dickins vma->vm_ops = &hugetlb_vm_ops; 941da177e4SLinus Torvalds 95dec4ad86SDavid Gibson if (vma->vm_pgoff & ~(HPAGE_MASK >> PAGE_SHIFT)) 96dec4ad86SDavid Gibson return -EINVAL; 97dec4ad86SDavid Gibson 981da177e4SLinus Torvalds vma_len = (loff_t)(vma->vm_end - vma->vm_start); 991da177e4SLinus Torvalds 1001b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1011da177e4SLinus Torvalds file_accessed(file); 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds ret = -ENOMEM; 1041da177e4SLinus Torvalds len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 1051da177e4SLinus Torvalds 106a43a8c39SChen, Kenneth W if (vma->vm_flags & VM_MAYSHARE && 107a43a8c39SChen, Kenneth W hugetlb_reserve_pages(inode, vma->vm_pgoff >> (HPAGE_SHIFT-PAGE_SHIFT), 108a43a8c39SChen, Kenneth W len >> HPAGE_SHIFT)) 109b45b5bd6SDavid Gibson goto out; 110b45b5bd6SDavid Gibson 1114c887265SAdam Litke ret = 0; 1124c887265SAdam Litke hugetlb_prefault_arch_hook(vma->vm_mm); 113b6174df5SZhang, Yanmin if (vma->vm_flags & VM_WRITE && inode->i_size < len) 1141da177e4SLinus Torvalds inode->i_size = len; 1151da177e4SLinus Torvalds out: 1161b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds return ret; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* 122508034a3SHugh Dickins * Called under down_write(mmap_sem). 1231da177e4SLinus Torvalds */ 1241da177e4SLinus Torvalds 125d2ba27e8SAdrian Bunk #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 1261da177e4SLinus Torvalds static unsigned long 1271da177e4SLinus Torvalds hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 1281da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, unsigned long flags) 1291da177e4SLinus Torvalds { 1301da177e4SLinus Torvalds struct mm_struct *mm = current->mm; 1311da177e4SLinus Torvalds struct vm_area_struct *vma; 1321da177e4SLinus Torvalds unsigned long start_addr; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds if (len & ~HPAGE_MASK) 1351da177e4SLinus Torvalds return -EINVAL; 1361da177e4SLinus Torvalds if (len > TASK_SIZE) 1371da177e4SLinus Torvalds return -ENOMEM; 1381da177e4SLinus Torvalds 139036e0856SBenjamin Herrenschmidt if (flags & MAP_FIXED) { 140dec4ad86SDavid Gibson if (prepare_hugepage_range(addr, len)) 141036e0856SBenjamin Herrenschmidt return -EINVAL; 142036e0856SBenjamin Herrenschmidt return addr; 143036e0856SBenjamin Herrenschmidt } 144036e0856SBenjamin Herrenschmidt 1451da177e4SLinus Torvalds if (addr) { 1461da177e4SLinus Torvalds addr = ALIGN(addr, HPAGE_SIZE); 1471da177e4SLinus Torvalds vma = find_vma(mm, addr); 1481da177e4SLinus Torvalds if (TASK_SIZE - len >= addr && 1491da177e4SLinus Torvalds (!vma || addr + len <= vma->vm_start)) 1501da177e4SLinus Torvalds return addr; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds start_addr = mm->free_area_cache; 1541da177e4SLinus Torvalds 1551363c3cdSWolfgang Wander if (len <= mm->cached_hole_size) 1561363c3cdSWolfgang Wander start_addr = TASK_UNMAPPED_BASE; 1571363c3cdSWolfgang Wander 1581da177e4SLinus Torvalds full_search: 1591da177e4SLinus Torvalds addr = ALIGN(start_addr, HPAGE_SIZE); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { 1621da177e4SLinus Torvalds /* At this point: (!vma || addr < vma->vm_end). */ 1631da177e4SLinus Torvalds if (TASK_SIZE - len < addr) { 1641da177e4SLinus Torvalds /* 1651da177e4SLinus Torvalds * Start a new search - just in case we missed 1661da177e4SLinus Torvalds * some holes. 1671da177e4SLinus Torvalds */ 1681da177e4SLinus Torvalds if (start_addr != TASK_UNMAPPED_BASE) { 1691da177e4SLinus Torvalds start_addr = TASK_UNMAPPED_BASE; 1701da177e4SLinus Torvalds goto full_search; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds return -ENOMEM; 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds if (!vma || addr + len <= vma->vm_start) 1761da177e4SLinus Torvalds return addr; 1771da177e4SLinus Torvalds addr = ALIGN(vma->vm_end, HPAGE_SIZE); 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds #endif 1811da177e4SLinus Torvalds 182e63e1e5aSBadari Pulavarty static int 183e63e1e5aSBadari Pulavarty hugetlbfs_read_actor(struct page *page, unsigned long offset, 184e63e1e5aSBadari Pulavarty char __user *buf, unsigned long count, 185e63e1e5aSBadari Pulavarty unsigned long size) 186e63e1e5aSBadari Pulavarty { 187e63e1e5aSBadari Pulavarty char *kaddr; 188e63e1e5aSBadari Pulavarty unsigned long left, copied = 0; 189e63e1e5aSBadari Pulavarty int i, chunksize; 190e63e1e5aSBadari Pulavarty 191e63e1e5aSBadari Pulavarty if (size > count) 192e63e1e5aSBadari Pulavarty size = count; 193e63e1e5aSBadari Pulavarty 194e63e1e5aSBadari Pulavarty /* Find which 4k chunk and offset with in that chunk */ 195e63e1e5aSBadari Pulavarty i = offset >> PAGE_CACHE_SHIFT; 196e63e1e5aSBadari Pulavarty offset = offset & ~PAGE_CACHE_MASK; 197e63e1e5aSBadari Pulavarty 198e63e1e5aSBadari Pulavarty while (size) { 199e63e1e5aSBadari Pulavarty chunksize = PAGE_CACHE_SIZE; 200e63e1e5aSBadari Pulavarty if (offset) 201e63e1e5aSBadari Pulavarty chunksize -= offset; 202e63e1e5aSBadari Pulavarty if (chunksize > size) 203e63e1e5aSBadari Pulavarty chunksize = size; 204e63e1e5aSBadari Pulavarty kaddr = kmap(&page[i]); 205e63e1e5aSBadari Pulavarty left = __copy_to_user(buf, kaddr + offset, chunksize); 206e63e1e5aSBadari Pulavarty kunmap(&page[i]); 207e63e1e5aSBadari Pulavarty if (left) { 208e63e1e5aSBadari Pulavarty copied += (chunksize - left); 209e63e1e5aSBadari Pulavarty break; 210e63e1e5aSBadari Pulavarty } 211e63e1e5aSBadari Pulavarty offset = 0; 212e63e1e5aSBadari Pulavarty size -= chunksize; 213e63e1e5aSBadari Pulavarty buf += chunksize; 214e63e1e5aSBadari Pulavarty copied += chunksize; 215e63e1e5aSBadari Pulavarty i++; 216e63e1e5aSBadari Pulavarty } 217e63e1e5aSBadari Pulavarty return copied ? copied : -EFAULT; 218e63e1e5aSBadari Pulavarty } 219e63e1e5aSBadari Pulavarty 220e63e1e5aSBadari Pulavarty /* 221e63e1e5aSBadari Pulavarty * Support for read() - Find the page attached to f_mapping and copy out the 222e63e1e5aSBadari Pulavarty * data. Its *very* similar to do_generic_mapping_read(), we can't use that 223e63e1e5aSBadari Pulavarty * since it has PAGE_CACHE_SIZE assumptions. 224e63e1e5aSBadari Pulavarty */ 225e63e1e5aSBadari Pulavarty static ssize_t hugetlbfs_read(struct file *filp, char __user *buf, 226e63e1e5aSBadari Pulavarty size_t len, loff_t *ppos) 227e63e1e5aSBadari Pulavarty { 228e63e1e5aSBadari Pulavarty struct address_space *mapping = filp->f_mapping; 229e63e1e5aSBadari Pulavarty struct inode *inode = mapping->host; 230e63e1e5aSBadari Pulavarty unsigned long index = *ppos >> HPAGE_SHIFT; 231e63e1e5aSBadari Pulavarty unsigned long offset = *ppos & ~HPAGE_MASK; 232e63e1e5aSBadari Pulavarty unsigned long end_index; 233e63e1e5aSBadari Pulavarty loff_t isize; 234e63e1e5aSBadari Pulavarty ssize_t retval = 0; 235e63e1e5aSBadari Pulavarty 236e63e1e5aSBadari Pulavarty mutex_lock(&inode->i_mutex); 237e63e1e5aSBadari Pulavarty 238e63e1e5aSBadari Pulavarty /* validate length */ 239e63e1e5aSBadari Pulavarty if (len == 0) 240e63e1e5aSBadari Pulavarty goto out; 241e63e1e5aSBadari Pulavarty 242e63e1e5aSBadari Pulavarty isize = i_size_read(inode); 243e63e1e5aSBadari Pulavarty if (!isize) 244e63e1e5aSBadari Pulavarty goto out; 245e63e1e5aSBadari Pulavarty 246e63e1e5aSBadari Pulavarty end_index = (isize - 1) >> HPAGE_SHIFT; 247e63e1e5aSBadari Pulavarty for (;;) { 248e63e1e5aSBadari Pulavarty struct page *page; 249e63e1e5aSBadari Pulavarty int nr, ret; 250e63e1e5aSBadari Pulavarty 251e63e1e5aSBadari Pulavarty /* nr is the maximum number of bytes to copy from this page */ 252e63e1e5aSBadari Pulavarty nr = HPAGE_SIZE; 253e63e1e5aSBadari Pulavarty if (index >= end_index) { 254e63e1e5aSBadari Pulavarty if (index > end_index) 255e63e1e5aSBadari Pulavarty goto out; 256e63e1e5aSBadari Pulavarty nr = ((isize - 1) & ~HPAGE_MASK) + 1; 257e63e1e5aSBadari Pulavarty if (nr <= offset) { 258e63e1e5aSBadari Pulavarty goto out; 259e63e1e5aSBadari Pulavarty } 260e63e1e5aSBadari Pulavarty } 261e63e1e5aSBadari Pulavarty nr = nr - offset; 262e63e1e5aSBadari Pulavarty 263e63e1e5aSBadari Pulavarty /* Find the page */ 264e63e1e5aSBadari Pulavarty page = find_get_page(mapping, index); 265e63e1e5aSBadari Pulavarty if (unlikely(page == NULL)) { 266e63e1e5aSBadari Pulavarty /* 267e63e1e5aSBadari Pulavarty * We have a HOLE, zero out the user-buffer for the 268e63e1e5aSBadari Pulavarty * length of the hole or request. 269e63e1e5aSBadari Pulavarty */ 270e63e1e5aSBadari Pulavarty ret = len < nr ? len : nr; 271e63e1e5aSBadari Pulavarty if (clear_user(buf, ret)) 272e63e1e5aSBadari Pulavarty ret = -EFAULT; 273e63e1e5aSBadari Pulavarty } else { 274e63e1e5aSBadari Pulavarty /* 275e63e1e5aSBadari Pulavarty * We have the page, copy it to user space buffer. 276e63e1e5aSBadari Pulavarty */ 277e63e1e5aSBadari Pulavarty ret = hugetlbfs_read_actor(page, offset, buf, len, nr); 278e63e1e5aSBadari Pulavarty } 279e63e1e5aSBadari Pulavarty if (ret < 0) { 280e63e1e5aSBadari Pulavarty if (retval == 0) 281e63e1e5aSBadari Pulavarty retval = ret; 282e63e1e5aSBadari Pulavarty if (page) 283e63e1e5aSBadari Pulavarty page_cache_release(page); 284e63e1e5aSBadari Pulavarty goto out; 285e63e1e5aSBadari Pulavarty } 286e63e1e5aSBadari Pulavarty 287e63e1e5aSBadari Pulavarty offset += ret; 288e63e1e5aSBadari Pulavarty retval += ret; 289e63e1e5aSBadari Pulavarty len -= ret; 290e63e1e5aSBadari Pulavarty index += offset >> HPAGE_SHIFT; 291e63e1e5aSBadari Pulavarty offset &= ~HPAGE_MASK; 292e63e1e5aSBadari Pulavarty 293e63e1e5aSBadari Pulavarty if (page) 294e63e1e5aSBadari Pulavarty page_cache_release(page); 295e63e1e5aSBadari Pulavarty 296e63e1e5aSBadari Pulavarty /* short read or no more work */ 297e63e1e5aSBadari Pulavarty if ((ret != nr) || (len == 0)) 298e63e1e5aSBadari Pulavarty break; 299e63e1e5aSBadari Pulavarty } 300e63e1e5aSBadari Pulavarty out: 301e63e1e5aSBadari Pulavarty *ppos = ((loff_t)index << HPAGE_SHIFT) + offset; 302e63e1e5aSBadari Pulavarty mutex_unlock(&inode->i_mutex); 303e63e1e5aSBadari Pulavarty return retval; 304e63e1e5aSBadari Pulavarty } 305e63e1e5aSBadari Pulavarty 3061da177e4SLinus Torvalds /* 3071da177e4SLinus Torvalds * Read a page. Again trivial. If it didn't already exist 3081da177e4SLinus Torvalds * in the page cache, it is zero-filled. 3091da177e4SLinus Torvalds */ 3101da177e4SLinus Torvalds static int hugetlbfs_readpage(struct file *file, struct page * page) 3111da177e4SLinus Torvalds { 3121da177e4SLinus Torvalds unlock_page(page); 3131da177e4SLinus Torvalds return -EINVAL; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 316800d15a5SNick Piggin static int hugetlbfs_write_begin(struct file *file, 317800d15a5SNick Piggin struct address_space *mapping, 318800d15a5SNick Piggin loff_t pos, unsigned len, unsigned flags, 319800d15a5SNick Piggin struct page **pagep, void **fsdata) 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds return -EINVAL; 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 324800d15a5SNick Piggin static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, 325800d15a5SNick Piggin loff_t pos, unsigned len, unsigned copied, 326800d15a5SNick Piggin struct page *page, void *fsdata) 3271da177e4SLinus Torvalds { 328800d15a5SNick Piggin BUG(); 3291da177e4SLinus Torvalds return -EINVAL; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds static void truncate_huge_page(struct page *page) 3331da177e4SLinus Torvalds { 334fba2591bSLinus Torvalds cancel_dirty_page(page, /* No IO accounting for huge pages? */0); 3351da177e4SLinus Torvalds ClearPageUptodate(page); 3361da177e4SLinus Torvalds remove_from_page_cache(page); 3371da177e4SLinus Torvalds put_page(page); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 340b45b5bd6SDavid Gibson static void truncate_hugepages(struct inode *inode, loff_t lstart) 3411da177e4SLinus Torvalds { 342b45b5bd6SDavid Gibson struct address_space *mapping = &inode->i_data; 3431da177e4SLinus Torvalds const pgoff_t start = lstart >> HPAGE_SHIFT; 3441da177e4SLinus Torvalds struct pagevec pvec; 3451da177e4SLinus Torvalds pgoff_t next; 346a43a8c39SChen, Kenneth W int i, freed = 0; 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds pagevec_init(&pvec, 0); 3491da177e4SLinus Torvalds next = start; 3501da177e4SLinus Torvalds while (1) { 3511da177e4SLinus Torvalds if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 3521da177e4SLinus Torvalds if (next == start) 3531da177e4SLinus Torvalds break; 3541da177e4SLinus Torvalds next = start; 3551da177e4SLinus Torvalds continue; 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); ++i) { 3591da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds lock_page(page); 3621da177e4SLinus Torvalds if (page->index > next) 3631da177e4SLinus Torvalds next = page->index; 3641da177e4SLinus Torvalds ++next; 3651da177e4SLinus Torvalds truncate_huge_page(page); 3661da177e4SLinus Torvalds unlock_page(page); 3671da177e4SLinus Torvalds hugetlb_put_quota(mapping); 368a43a8c39SChen, Kenneth W freed++; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds huge_pagevec_release(&pvec); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds BUG_ON(!lstart && mapping->nrpages); 373a43a8c39SChen, Kenneth W hugetlb_unreserve_pages(inode, start, freed); 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds static void hugetlbfs_delete_inode(struct inode *inode) 3771da177e4SLinus Torvalds { 378b45b5bd6SDavid Gibson truncate_hugepages(inode, 0); 379149f4211SChristoph Hellwig clear_inode(inode); 380149f4211SChristoph Hellwig } 381149f4211SChristoph Hellwig 382ddc0a51dSJosh Triplett static void hugetlbfs_forget_inode(struct inode *inode) __releases(inode_lock) 3831da177e4SLinus Torvalds { 3840b1533f6SChristoph Hellwig struct super_block *sb = inode->i_sb; 3851da177e4SLinus Torvalds 3860b1533f6SChristoph Hellwig if (!hlist_unhashed(&inode->i_hash)) { 3870b1533f6SChristoph Hellwig if (!(inode->i_state & (I_DIRTY|I_LOCK))) 3880b1533f6SChristoph Hellwig list_move(&inode->i_list, &inode_unused); 3891da177e4SLinus Torvalds inodes_stat.nr_unused++; 3900b1533f6SChristoph Hellwig if (!sb || (sb->s_flags & MS_ACTIVE)) { 3911da177e4SLinus Torvalds spin_unlock(&inode_lock); 3921da177e4SLinus Torvalds return; 3931da177e4SLinus Torvalds } 3940b1533f6SChristoph Hellwig inode->i_state |= I_WILL_FREE; 3950b1533f6SChristoph Hellwig spin_unlock(&inode_lock); 3960b1533f6SChristoph Hellwig /* 3970b1533f6SChristoph Hellwig * write_inode_now is a noop as we set BDI_CAP_NO_WRITEBACK 3980b1533f6SChristoph Hellwig * in our backing_dev_info. 3990b1533f6SChristoph Hellwig */ 4000b1533f6SChristoph Hellwig write_inode_now(inode, 1); 4010b1533f6SChristoph Hellwig spin_lock(&inode_lock); 4020b1533f6SChristoph Hellwig inode->i_state &= ~I_WILL_FREE; 4031da177e4SLinus Torvalds inodes_stat.nr_unused--; 4041da177e4SLinus Torvalds hlist_del_init(&inode->i_hash); 4050b1533f6SChristoph Hellwig } 4061da177e4SLinus Torvalds list_del_init(&inode->i_list); 4071da177e4SLinus Torvalds list_del_init(&inode->i_sb_list); 4081da177e4SLinus Torvalds inode->i_state |= I_FREEING; 4091da177e4SLinus Torvalds inodes_stat.nr_inodes--; 4101da177e4SLinus Torvalds spin_unlock(&inode_lock); 411b45b5bd6SDavid Gibson truncate_hugepages(inode, 0); 4121da177e4SLinus Torvalds clear_inode(inode); 4131da177e4SLinus Torvalds destroy_inode(inode); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds static void hugetlbfs_drop_inode(struct inode *inode) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds if (!inode->i_nlink) 4196b09b9dfSChristoph Hellwig generic_delete_inode(inode); 4201da177e4SLinus Torvalds else 4211da177e4SLinus Torvalds hugetlbfs_forget_inode(inode); 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds static inline void 425856fc295SHugh Dickins hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds struct vm_area_struct *vma; 4281da177e4SLinus Torvalds struct prio_tree_iter iter; 4291da177e4SLinus Torvalds 430856fc295SHugh Dickins vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) { 4311da177e4SLinus Torvalds unsigned long v_offset; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds /* 434856fc295SHugh Dickins * Can the expression below overflow on 32-bit arches? 435856fc295SHugh Dickins * No, because the prio_tree returns us only those vmas 436856fc295SHugh Dickins * which overlap the truncated area starting at pgoff, 437856fc295SHugh Dickins * and no vma on a 32-bit arch can span beyond the 4GB. 4381da177e4SLinus Torvalds */ 439856fc295SHugh Dickins if (vma->vm_pgoff < pgoff) 440856fc295SHugh Dickins v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; 441856fc295SHugh Dickins else 4421da177e4SLinus Torvalds v_offset = 0; 4431da177e4SLinus Torvalds 444502717f4SChen, Kenneth W __unmap_hugepage_range(vma, 445508034a3SHugh Dickins vma->vm_start + v_offset, vma->vm_end); 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) 4501da177e4SLinus Torvalds { 451856fc295SHugh Dickins pgoff_t pgoff; 4521da177e4SLinus Torvalds struct address_space *mapping = inode->i_mapping; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds BUG_ON(offset & ~HPAGE_MASK); 455856fc295SHugh Dickins pgoff = offset >> PAGE_SHIFT; 4561da177e4SLinus Torvalds 4577aa91e10SKen Chen i_size_write(inode, offset); 4581da177e4SLinus Torvalds spin_lock(&mapping->i_mmap_lock); 4591da177e4SLinus Torvalds if (!prio_tree_empty(&mapping->i_mmap)) 4601da177e4SLinus Torvalds hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); 4611da177e4SLinus Torvalds spin_unlock(&mapping->i_mmap_lock); 462b45b5bd6SDavid Gibson truncate_hugepages(inode, offset); 4631da177e4SLinus Torvalds return 0; 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 4691da177e4SLinus Torvalds int error; 4701da177e4SLinus Torvalds unsigned int ia_valid = attr->ia_valid; 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds BUG_ON(!inode); 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds error = inode_change_ok(inode, attr); 4751da177e4SLinus Torvalds if (error) 4761da177e4SLinus Torvalds goto out; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds if (ia_valid & ATTR_SIZE) { 4791da177e4SLinus Torvalds error = -EINVAL; 4801da177e4SLinus Torvalds if (!(attr->ia_size & ~HPAGE_MASK)) 4811da177e4SLinus Torvalds error = hugetlb_vmtruncate(inode, attr->ia_size); 4821da177e4SLinus Torvalds if (error) 4831da177e4SLinus Torvalds goto out; 4841da177e4SLinus Torvalds attr->ia_valid &= ~ATTR_SIZE; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds error = inode_setattr(inode, attr); 4871da177e4SLinus Torvalds out: 4881da177e4SLinus Torvalds return error; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, 4921da177e4SLinus Torvalds gid_t gid, int mode, dev_t dev) 4931da177e4SLinus Torvalds { 4941da177e4SLinus Torvalds struct inode *inode; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds inode = new_inode(sb); 4971da177e4SLinus Torvalds if (inode) { 4981da177e4SLinus Torvalds struct hugetlbfs_inode_info *info; 4991da177e4SLinus Torvalds inode->i_mode = mode; 5001da177e4SLinus Torvalds inode->i_uid = uid; 5011da177e4SLinus Torvalds inode->i_gid = gid; 5021da177e4SLinus Torvalds inode->i_blocks = 0; 5031da177e4SLinus Torvalds inode->i_mapping->a_ops = &hugetlbfs_aops; 5041da177e4SLinus Torvalds inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; 5051da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 506a43a8c39SChen, Kenneth W INIT_LIST_HEAD(&inode->i_mapping->private_list); 5071da177e4SLinus Torvalds info = HUGETLBFS_I(inode); 5087339ff83SRobin Holt mpol_shared_policy_init(&info->policy, MPOL_DEFAULT, NULL); 5091da177e4SLinus Torvalds switch (mode & S_IFMT) { 5101da177e4SLinus Torvalds default: 5111da177e4SLinus Torvalds init_special_inode(inode, mode, dev); 5121da177e4SLinus Torvalds break; 5131da177e4SLinus Torvalds case S_IFREG: 5141da177e4SLinus Torvalds inode->i_op = &hugetlbfs_inode_operations; 5151da177e4SLinus Torvalds inode->i_fop = &hugetlbfs_file_operations; 5161da177e4SLinus Torvalds break; 5171da177e4SLinus Torvalds case S_IFDIR: 5181da177e4SLinus Torvalds inode->i_op = &hugetlbfs_dir_inode_operations; 5191da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* directory inodes start off with i_nlink == 2 (for "." entry) */ 522d8c76e6fSDave Hansen inc_nlink(inode); 5231da177e4SLinus Torvalds break; 5241da177e4SLinus Torvalds case S_IFLNK: 5251da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 5261da177e4SLinus Torvalds break; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds return inode; 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds /* 5331da177e4SLinus Torvalds * File creation. Allocate an inode, and we're done.. 5341da177e4SLinus Torvalds */ 5351da177e4SLinus Torvalds static int hugetlbfs_mknod(struct inode *dir, 5361da177e4SLinus Torvalds struct dentry *dentry, int mode, dev_t dev) 5371da177e4SLinus Torvalds { 5381da177e4SLinus Torvalds struct inode *inode; 5391da177e4SLinus Torvalds int error = -ENOSPC; 5401da177e4SLinus Torvalds gid_t gid; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds if (dir->i_mode & S_ISGID) { 5431da177e4SLinus Torvalds gid = dir->i_gid; 5441da177e4SLinus Torvalds if (S_ISDIR(mode)) 5451da177e4SLinus Torvalds mode |= S_ISGID; 5461da177e4SLinus Torvalds } else { 5471da177e4SLinus Torvalds gid = current->fsgid; 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds inode = hugetlbfs_get_inode(dir->i_sb, current->fsuid, gid, mode, dev); 5501da177e4SLinus Torvalds if (inode) { 5511da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5521da177e4SLinus Torvalds d_instantiate(dentry, inode); 5531da177e4SLinus Torvalds dget(dentry); /* Extra count - pin the dentry in core */ 5541da177e4SLinus Torvalds error = 0; 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds return error; 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 5601da177e4SLinus Torvalds { 5611da177e4SLinus Torvalds int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); 5621da177e4SLinus Torvalds if (!retval) 563d8c76e6fSDave Hansen inc_nlink(dir); 5641da177e4SLinus Torvalds return retval; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) 5681da177e4SLinus Torvalds { 5691da177e4SLinus Torvalds return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds static int hugetlbfs_symlink(struct inode *dir, 5731da177e4SLinus Torvalds struct dentry *dentry, const char *symname) 5741da177e4SLinus Torvalds { 5751da177e4SLinus Torvalds struct inode *inode; 5761da177e4SLinus Torvalds int error = -ENOSPC; 5771da177e4SLinus Torvalds gid_t gid; 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds if (dir->i_mode & S_ISGID) 5801da177e4SLinus Torvalds gid = dir->i_gid; 5811da177e4SLinus Torvalds else 5821da177e4SLinus Torvalds gid = current->fsgid; 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds inode = hugetlbfs_get_inode(dir->i_sb, current->fsuid, 5851da177e4SLinus Torvalds gid, S_IFLNK|S_IRWXUGO, 0); 5861da177e4SLinus Torvalds if (inode) { 5871da177e4SLinus Torvalds int l = strlen(symname)+1; 5881da177e4SLinus Torvalds error = page_symlink(inode, symname, l); 5891da177e4SLinus Torvalds if (!error) { 5901da177e4SLinus Torvalds d_instantiate(dentry, inode); 5911da177e4SLinus Torvalds dget(dentry); 5921da177e4SLinus Torvalds } else 5931da177e4SLinus Torvalds iput(inode); 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds return error; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds /* 6016649a386SKen Chen * mark the head page dirty 6021da177e4SLinus Torvalds */ 6031da177e4SLinus Torvalds static int hugetlbfs_set_page_dirty(struct page *page) 6041da177e4SLinus Torvalds { 605d85f3385SChristoph Lameter struct page *head = compound_head(page); 6066649a386SKen Chen 6076649a386SKen Chen SetPageDirty(head); 6081da177e4SLinus Torvalds return 0; 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds 611726c3342SDavid Howells static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) 6121da177e4SLinus Torvalds { 613726c3342SDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds buf->f_type = HUGETLBFS_MAGIC; 6161da177e4SLinus Torvalds buf->f_bsize = HPAGE_SIZE; 6171da177e4SLinus Torvalds if (sbinfo) { 6181da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 61974a8a65cSDavid Gibson /* If no limits set, just report 0 for max/free/used 62074a8a65cSDavid Gibson * blocks, like simple_statfs() */ 62174a8a65cSDavid Gibson if (sbinfo->max_blocks >= 0) { 6221da177e4SLinus Torvalds buf->f_blocks = sbinfo->max_blocks; 6231da177e4SLinus Torvalds buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; 6241da177e4SLinus Torvalds buf->f_files = sbinfo->max_inodes; 6251da177e4SLinus Torvalds buf->f_ffree = sbinfo->free_inodes; 62674a8a65cSDavid Gibson } 6271da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds buf->f_namelen = NAME_MAX; 6301da177e4SLinus Torvalds return 0; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds static void hugetlbfs_put_super(struct super_block *sb) 6341da177e4SLinus Torvalds { 6351da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds if (sbi) { 6381da177e4SLinus Torvalds sb->s_fs_info = NULL; 6391da177e4SLinus Torvalds kfree(sbi); 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 64396527980SChristoph Hellwig static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) 64496527980SChristoph Hellwig { 64596527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 64696527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 64796527980SChristoph Hellwig if (unlikely(!sbinfo->free_inodes)) { 64896527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 64996527980SChristoph Hellwig return 0; 65096527980SChristoph Hellwig } 65196527980SChristoph Hellwig sbinfo->free_inodes--; 65296527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 65396527980SChristoph Hellwig } 65496527980SChristoph Hellwig 65596527980SChristoph Hellwig return 1; 65696527980SChristoph Hellwig } 65796527980SChristoph Hellwig 65896527980SChristoph Hellwig static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) 65996527980SChristoph Hellwig { 66096527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 66196527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 66296527980SChristoph Hellwig sbinfo->free_inodes++; 66396527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 66496527980SChristoph Hellwig } 66596527980SChristoph Hellwig } 66696527980SChristoph Hellwig 66796527980SChristoph Hellwig 668e18b890bSChristoph Lameter static struct kmem_cache *hugetlbfs_inode_cachep; 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) 6711da177e4SLinus Torvalds { 67296527980SChristoph Hellwig struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); 6731da177e4SLinus Torvalds struct hugetlbfs_inode_info *p; 6741da177e4SLinus Torvalds 67596527980SChristoph Hellwig if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) 6761da177e4SLinus Torvalds return NULL; 677e94b1766SChristoph Lameter p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); 67896527980SChristoph Hellwig if (unlikely(!p)) { 67996527980SChristoph Hellwig hugetlbfs_inc_free_inodes(sbinfo); 68096527980SChristoph Hellwig return NULL; 6811da177e4SLinus Torvalds } 68296527980SChristoph Hellwig return &p->vfs_inode; 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds static void hugetlbfs_destroy_inode(struct inode *inode) 6861da177e4SLinus Torvalds { 68796527980SChristoph Hellwig hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); 6881da177e4SLinus Torvalds mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); 6891da177e4SLinus Torvalds kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 692f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops = { 6931da177e4SLinus Torvalds .readpage = hugetlbfs_readpage, 694800d15a5SNick Piggin .write_begin = hugetlbfs_write_begin, 695800d15a5SNick Piggin .write_end = hugetlbfs_write_end, 6961da177e4SLinus Torvalds .set_page_dirty = hugetlbfs_set_page_dirty, 6971da177e4SLinus Torvalds }; 6981da177e4SLinus Torvalds 69996527980SChristoph Hellwig 700e18b890bSChristoph Lameter static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags) 70196527980SChristoph Hellwig { 70296527980SChristoph Hellwig struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; 70396527980SChristoph Hellwig 70496527980SChristoph Hellwig inode_init_once(&ei->vfs_inode); 70596527980SChristoph Hellwig } 70696527980SChristoph Hellwig 7074b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations = { 708e63e1e5aSBadari Pulavarty .read = hugetlbfs_read, 7091da177e4SLinus Torvalds .mmap = hugetlbfs_file_mmap, 7101da177e4SLinus Torvalds .fsync = simple_sync_file, 7111da177e4SLinus Torvalds .get_unmapped_area = hugetlb_get_unmapped_area, 7121da177e4SLinus Torvalds }; 7131da177e4SLinus Torvalds 71492e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations = { 7151da177e4SLinus Torvalds .create = hugetlbfs_create, 7161da177e4SLinus Torvalds .lookup = simple_lookup, 7171da177e4SLinus Torvalds .link = simple_link, 7181da177e4SLinus Torvalds .unlink = simple_unlink, 7191da177e4SLinus Torvalds .symlink = hugetlbfs_symlink, 7201da177e4SLinus Torvalds .mkdir = hugetlbfs_mkdir, 7211da177e4SLinus Torvalds .rmdir = simple_rmdir, 7221da177e4SLinus Torvalds .mknod = hugetlbfs_mknod, 7231da177e4SLinus Torvalds .rename = simple_rename, 7241da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7251da177e4SLinus Torvalds }; 7261da177e4SLinus Torvalds 72792e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations = { 7281da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7291da177e4SLinus Torvalds }; 7301da177e4SLinus Torvalds 731ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops = { 7321da177e4SLinus Torvalds .alloc_inode = hugetlbfs_alloc_inode, 7331da177e4SLinus Torvalds .destroy_inode = hugetlbfs_destroy_inode, 7341da177e4SLinus Torvalds .statfs = hugetlbfs_statfs, 735149f4211SChristoph Hellwig .delete_inode = hugetlbfs_delete_inode, 7361da177e4SLinus Torvalds .drop_inode = hugetlbfs_drop_inode, 7371da177e4SLinus Torvalds .put_super = hugetlbfs_put_super, 7381da177e4SLinus Torvalds }; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds static int 7411da177e4SLinus Torvalds hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 7421da177e4SLinus Torvalds { 743e73a75faSRandy Dunlap char *p, *rest; 744e73a75faSRandy Dunlap substring_t args[MAX_OPT_ARGS]; 745e73a75faSRandy Dunlap int option; 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds if (!options) 7481da177e4SLinus Torvalds return 0; 7491da177e4SLinus Torvalds 750e73a75faSRandy Dunlap while ((p = strsep(&options, ",")) != NULL) { 751e73a75faSRandy Dunlap int token; 752b4c07bceSLee Schermerhorn if (!*p) 753b4c07bceSLee Schermerhorn continue; 7541da177e4SLinus Torvalds 755e73a75faSRandy Dunlap token = match_token(p, tokens, args); 756e73a75faSRandy Dunlap switch (token) { 757e73a75faSRandy Dunlap case Opt_uid: 758e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 759e73a75faSRandy Dunlap goto bad_val; 760e73a75faSRandy Dunlap pconfig->uid = option; 761e73a75faSRandy Dunlap break; 762e73a75faSRandy Dunlap 763e73a75faSRandy Dunlap case Opt_gid: 764e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 765e73a75faSRandy Dunlap goto bad_val; 766e73a75faSRandy Dunlap pconfig->gid = option; 767e73a75faSRandy Dunlap break; 768e73a75faSRandy Dunlap 769e73a75faSRandy Dunlap case Opt_mode: 770e73a75faSRandy Dunlap if (match_octal(&args[0], &option)) 771e73a75faSRandy Dunlap goto bad_val; 772e73a75faSRandy Dunlap pconfig->mode = option & 0777U; 773e73a75faSRandy Dunlap break; 774e73a75faSRandy Dunlap 775e73a75faSRandy Dunlap case Opt_size: { 776e73a75faSRandy Dunlap unsigned long long size; 777e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 778e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 779e73a75faSRandy Dunlap goto bad_val; 780e73a75faSRandy Dunlap size = memparse(args[0].from, &rest); 7811da177e4SLinus Torvalds if (*rest == '%') { 7821da177e4SLinus Torvalds size <<= HPAGE_SHIFT; 7831da177e4SLinus Torvalds size *= max_huge_pages; 7841da177e4SLinus Torvalds do_div(size, 100); 7851da177e4SLinus Torvalds } 7861da177e4SLinus Torvalds pconfig->nr_blocks = (size >> HPAGE_SHIFT); 787e73a75faSRandy Dunlap break; 788e73a75faSRandy Dunlap } 7891da177e4SLinus Torvalds 790e73a75faSRandy Dunlap case Opt_nr_inodes: 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 pconfig->nr_inodes = memparse(args[0].from, &rest); 795e73a75faSRandy Dunlap break; 796e73a75faSRandy Dunlap 797e73a75faSRandy Dunlap default: 798b4c07bceSLee Schermerhorn printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n", 799b4c07bceSLee Schermerhorn p); 800b4c07bceSLee Schermerhorn return -EINVAL; 801e73a75faSRandy Dunlap break; 802e73a75faSRandy Dunlap } 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds return 0; 805e73a75faSRandy Dunlap 806e73a75faSRandy Dunlap bad_val: 807e73a75faSRandy Dunlap printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n", 808e73a75faSRandy Dunlap args[0].from, p); 809e73a75faSRandy Dunlap return 1; 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds static int 8131da177e4SLinus Torvalds hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 8141da177e4SLinus Torvalds { 8151da177e4SLinus Torvalds struct inode * inode; 8161da177e4SLinus Torvalds struct dentry * root; 8171da177e4SLinus Torvalds int ret; 8181da177e4SLinus Torvalds struct hugetlbfs_config config; 8191da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo; 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds config.nr_blocks = -1; /* No limit on size by default */ 8221da177e4SLinus Torvalds config.nr_inodes = -1; /* No limit on number of inodes by default */ 8231da177e4SLinus Torvalds config.uid = current->fsuid; 8241da177e4SLinus Torvalds config.gid = current->fsgid; 8251da177e4SLinus Torvalds config.mode = 0755; 8261da177e4SLinus Torvalds ret = hugetlbfs_parse_options(data, &config); 8271da177e4SLinus Torvalds if (ret) 8281da177e4SLinus Torvalds return ret; 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); 8311da177e4SLinus Torvalds if (!sbinfo) 8321da177e4SLinus Torvalds return -ENOMEM; 8331da177e4SLinus Torvalds sb->s_fs_info = sbinfo; 8341da177e4SLinus Torvalds spin_lock_init(&sbinfo->stat_lock); 8351da177e4SLinus Torvalds sbinfo->max_blocks = config.nr_blocks; 8361da177e4SLinus Torvalds sbinfo->free_blocks = config.nr_blocks; 8371da177e4SLinus Torvalds sbinfo->max_inodes = config.nr_inodes; 8381da177e4SLinus Torvalds sbinfo->free_inodes = config.nr_inodes; 8391da177e4SLinus Torvalds sb->s_maxbytes = MAX_LFS_FILESIZE; 8401da177e4SLinus Torvalds sb->s_blocksize = HPAGE_SIZE; 8411da177e4SLinus Torvalds sb->s_blocksize_bits = HPAGE_SHIFT; 8421da177e4SLinus Torvalds sb->s_magic = HUGETLBFS_MAGIC; 8431da177e4SLinus Torvalds sb->s_op = &hugetlbfs_ops; 8441da177e4SLinus Torvalds sb->s_time_gran = 1; 8451da177e4SLinus Torvalds inode = hugetlbfs_get_inode(sb, config.uid, config.gid, 8461da177e4SLinus Torvalds S_IFDIR | config.mode, 0); 8471da177e4SLinus Torvalds if (!inode) 8481da177e4SLinus Torvalds goto out_free; 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds root = d_alloc_root(inode); 8511da177e4SLinus Torvalds if (!root) { 8521da177e4SLinus Torvalds iput(inode); 8531da177e4SLinus Torvalds goto out_free; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds sb->s_root = root; 8561da177e4SLinus Torvalds return 0; 8571da177e4SLinus Torvalds out_free: 8581da177e4SLinus Torvalds kfree(sbinfo); 8591da177e4SLinus Torvalds return -ENOMEM; 8601da177e4SLinus Torvalds } 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds int hugetlb_get_quota(struct address_space *mapping) 8631da177e4SLinus Torvalds { 8641da177e4SLinus Torvalds int ret = 0; 8651da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds if (sbinfo->free_blocks > -1) { 8681da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 8691da177e4SLinus Torvalds if (sbinfo->free_blocks > 0) 8701da177e4SLinus Torvalds sbinfo->free_blocks--; 8711da177e4SLinus Torvalds else 8721da177e4SLinus Torvalds ret = -ENOMEM; 8731da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds return ret; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds void hugetlb_put_quota(struct address_space *mapping) 8801da177e4SLinus Torvalds { 8811da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(mapping->host->i_sb); 8821da177e4SLinus Torvalds 8831da177e4SLinus Torvalds if (sbinfo->free_blocks > -1) { 8841da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 8851da177e4SLinus Torvalds sbinfo->free_blocks++; 8861da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 8871da177e4SLinus Torvalds } 8881da177e4SLinus Torvalds } 8891da177e4SLinus Torvalds 890454e2398SDavid Howells static int hugetlbfs_get_sb(struct file_system_type *fs_type, 891454e2398SDavid Howells int flags, const char *dev_name, void *data, struct vfsmount *mnt) 8921da177e4SLinus Torvalds { 893454e2398SDavid Howells return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt); 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds static struct file_system_type hugetlbfs_fs_type = { 8971da177e4SLinus Torvalds .name = "hugetlbfs", 8981da177e4SLinus Torvalds .get_sb = hugetlbfs_get_sb, 8991da177e4SLinus Torvalds .kill_sb = kill_litter_super, 9001da177e4SLinus Torvalds }; 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds static struct vfsmount *hugetlbfs_vfsmount; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds static int can_do_hugetlb_shm(void) 9051da177e4SLinus Torvalds { 9061da177e4SLinus Torvalds return likely(capable(CAP_IPC_LOCK) || 9071da177e4SLinus Torvalds in_group_p(sysctl_hugetlb_shm_group) || 9081da177e4SLinus Torvalds can_do_mlock()); 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds 9119d66586fSEric W. Biederman struct file *hugetlb_file_setup(const char *name, size_t size) 9121da177e4SLinus Torvalds { 9131da177e4SLinus Torvalds int error = -ENOMEM; 9141da177e4SLinus Torvalds struct file *file; 9151da177e4SLinus Torvalds struct inode *inode; 9161da177e4SLinus Torvalds struct dentry *dentry, *root; 9171da177e4SLinus Torvalds struct qstr quick_string; 9181da177e4SLinus Torvalds 9195bc98594SAkinobu Mita if (!hugetlbfs_vfsmount) 9205bc98594SAkinobu Mita return ERR_PTR(-ENOENT); 9215bc98594SAkinobu Mita 9221da177e4SLinus Torvalds if (!can_do_hugetlb_shm()) 9231da177e4SLinus Torvalds return ERR_PTR(-EPERM); 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds if (!user_shm_lock(size, current->user)) 9261da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds root = hugetlbfs_vfsmount->mnt_root; 9299d66586fSEric W. Biederman quick_string.name = name; 9301da177e4SLinus Torvalds quick_string.len = strlen(quick_string.name); 9311da177e4SLinus Torvalds quick_string.hash = 0; 9321da177e4SLinus Torvalds dentry = d_alloc(root, &quick_string); 9331da177e4SLinus Torvalds if (!dentry) 9341da177e4SLinus Torvalds goto out_shm_unlock; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds error = -ENFILE; 9371da177e4SLinus Torvalds file = get_empty_filp(); 9381da177e4SLinus Torvalds if (!file) 9391da177e4SLinus Torvalds goto out_dentry; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds error = -ENOSPC; 9421da177e4SLinus Torvalds inode = hugetlbfs_get_inode(root->d_sb, current->fsuid, 9431da177e4SLinus Torvalds current->fsgid, S_IFREG | S_IRWXUGO, 0); 9441da177e4SLinus Torvalds if (!inode) 9451da177e4SLinus Torvalds goto out_file; 9461da177e4SLinus Torvalds 947b45b5bd6SDavid Gibson error = -ENOMEM; 948a43a8c39SChen, Kenneth W if (hugetlb_reserve_pages(inode, 0, size >> HPAGE_SHIFT)) 949b45b5bd6SDavid Gibson goto out_inode; 950b45b5bd6SDavid Gibson 9511da177e4SLinus Torvalds d_instantiate(dentry, inode); 9521da177e4SLinus Torvalds inode->i_size = size; 9531da177e4SLinus Torvalds inode->i_nlink = 0; 954b39424e2SJosef Sipek file->f_path.mnt = mntget(hugetlbfs_vfsmount); 955b39424e2SJosef Sipek file->f_path.dentry = dentry; 9561da177e4SLinus Torvalds file->f_mapping = inode->i_mapping; 9571da177e4SLinus Torvalds file->f_op = &hugetlbfs_file_operations; 9581da177e4SLinus Torvalds file->f_mode = FMODE_WRITE | FMODE_READ; 9591da177e4SLinus Torvalds return file; 9601da177e4SLinus Torvalds 961b45b5bd6SDavid Gibson out_inode: 962b45b5bd6SDavid Gibson iput(inode); 9631da177e4SLinus Torvalds out_file: 9641da177e4SLinus Torvalds put_filp(file); 9651da177e4SLinus Torvalds out_dentry: 9661da177e4SLinus Torvalds dput(dentry); 9671da177e4SLinus Torvalds out_shm_unlock: 9681da177e4SLinus Torvalds user_shm_unlock(size, current->user); 9691da177e4SLinus Torvalds return ERR_PTR(error); 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds static int __init init_hugetlbfs_fs(void) 9731da177e4SLinus Torvalds { 9741da177e4SLinus Torvalds int error; 9751da177e4SLinus Torvalds struct vfsmount *vfsmount; 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", 9781da177e4SLinus Torvalds sizeof(struct hugetlbfs_inode_info), 97920c2df83SPaul Mundt 0, 0, init_once); 9801da177e4SLinus Torvalds if (hugetlbfs_inode_cachep == NULL) 9811da177e4SLinus Torvalds return -ENOMEM; 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds error = register_filesystem(&hugetlbfs_fs_type); 9841da177e4SLinus Torvalds if (error) 9851da177e4SLinus Torvalds goto out; 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds vfsmount = kern_mount(&hugetlbfs_fs_type); 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds if (!IS_ERR(vfsmount)) { 9901da177e4SLinus Torvalds hugetlbfs_vfsmount = vfsmount; 9911da177e4SLinus Torvalds return 0; 9921da177e4SLinus Torvalds } 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds error = PTR_ERR(vfsmount); 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds out: 9971da177e4SLinus Torvalds if (error) 9981da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 9991da177e4SLinus Torvalds return error; 10001da177e4SLinus Torvalds } 10011da177e4SLinus Torvalds 10021da177e4SLinus Torvalds static void __exit exit_hugetlbfs_fs(void) 10031da177e4SLinus Torvalds { 10041da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 10051da177e4SLinus Torvalds unregister_filesystem(&hugetlbfs_fs_type); 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds module_init(init_hugetlbfs_fs) 10091da177e4SLinus Torvalds module_exit(exit_hugetlbfs_fs) 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1012