11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * hugetlbpage-backed filesystem. Based on ramfs. 31da177e4SLinus Torvalds * 46d49e352SNadia Yvette Chambers * Nadia Yvette Chambers, 2002 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 2002 Linus Torvalds. 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 99b857d26SAndrew Morton #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 109b857d26SAndrew Morton 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/thread_info.h> 131da177e4SLinus Torvalds #include <asm/current.h> 141da177e4SLinus Torvalds #include <linux/sched.h> /* remove ASAP */ 151da177e4SLinus Torvalds #include <linux/fs.h> 161da177e4SLinus Torvalds #include <linux/mount.h> 171da177e4SLinus Torvalds #include <linux/file.h> 18e73a75faSRandy Dunlap #include <linux/kernel.h> 191da177e4SLinus Torvalds #include <linux/writeback.h> 201da177e4SLinus Torvalds #include <linux/pagemap.h> 211da177e4SLinus Torvalds #include <linux/highmem.h> 221da177e4SLinus Torvalds #include <linux/init.h> 231da177e4SLinus Torvalds #include <linux/string.h> 2416f7e0feSRandy Dunlap #include <linux/capability.h> 25e73a75faSRandy Dunlap #include <linux/ctype.h> 261da177e4SLinus Torvalds #include <linux/backing-dev.h> 271da177e4SLinus Torvalds #include <linux/hugetlb.h> 281da177e4SLinus Torvalds #include <linux/pagevec.h> 29e73a75faSRandy Dunlap #include <linux/parser.h> 30036e0856SBenjamin Herrenschmidt #include <linux/mman.h> 311da177e4SLinus Torvalds #include <linux/slab.h> 321da177e4SLinus Torvalds #include <linux/dnotify.h> 331da177e4SLinus Torvalds #include <linux/statfs.h> 341da177e4SLinus Torvalds #include <linux/security.h> 351fd7317dSNick Black #include <linux/magic.h> 36290408d4SNaoya Horiguchi #include <linux/migrate.h> 3734d0640eSAl Viro #include <linux/uio.h> 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #include <asm/uaccess.h> 401da177e4SLinus Torvalds 41ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops; 42f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops; 434b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations; 4492e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations; 4592e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations; 461da177e4SLinus Torvalds 47a1d776eeSDavid Gibson struct hugetlbfs_config { 48a0eb3a05SEric W. Biederman kuid_t uid; 49a0eb3a05SEric W. Biederman kgid_t gid; 50a1d776eeSDavid Gibson umode_t mode; 51a1d776eeSDavid Gibson long nr_blocks; 52a1d776eeSDavid Gibson long nr_inodes; 53a1d776eeSDavid Gibson struct hstate *hstate; 54a1d776eeSDavid Gibson }; 55a1d776eeSDavid Gibson 56a1d776eeSDavid Gibson struct hugetlbfs_inode_info { 57a1d776eeSDavid Gibson struct shared_policy policy; 58a1d776eeSDavid Gibson struct inode vfs_inode; 59a1d776eeSDavid Gibson }; 60a1d776eeSDavid Gibson 61a1d776eeSDavid Gibson static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 62a1d776eeSDavid Gibson { 63a1d776eeSDavid Gibson return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 64a1d776eeSDavid Gibson } 65a1d776eeSDavid Gibson 661da177e4SLinus Torvalds int sysctl_hugetlb_shm_group; 671da177e4SLinus Torvalds 68e73a75faSRandy Dunlap enum { 69e73a75faSRandy Dunlap Opt_size, Opt_nr_inodes, 70e73a75faSRandy Dunlap Opt_mode, Opt_uid, Opt_gid, 71a137e1ccSAndi Kleen Opt_pagesize, 72e73a75faSRandy Dunlap Opt_err, 73e73a75faSRandy Dunlap }; 74e73a75faSRandy Dunlap 75a447c093SSteven Whitehouse static const match_table_t tokens = { 76e73a75faSRandy Dunlap {Opt_size, "size=%s"}, 77e73a75faSRandy Dunlap {Opt_nr_inodes, "nr_inodes=%s"}, 78e73a75faSRandy Dunlap {Opt_mode, "mode=%o"}, 79e73a75faSRandy Dunlap {Opt_uid, "uid=%u"}, 80e73a75faSRandy Dunlap {Opt_gid, "gid=%u"}, 81a137e1ccSAndi Kleen {Opt_pagesize, "pagesize=%s"}, 82e73a75faSRandy Dunlap {Opt_err, NULL}, 83e73a75faSRandy Dunlap }; 84e73a75faSRandy Dunlap 852e9b367cSAdam Litke static void huge_pagevec_release(struct pagevec *pvec) 862e9b367cSAdam Litke { 872e9b367cSAdam Litke int i; 882e9b367cSAdam Litke 892e9b367cSAdam Litke for (i = 0; i < pagevec_count(pvec); ++i) 902e9b367cSAdam Litke put_page(pvec->pages[i]); 912e9b367cSAdam Litke 922e9b367cSAdam Litke pagevec_reinit(pvec); 932e9b367cSAdam Litke } 942e9b367cSAdam Litke 951da177e4SLinus Torvalds static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) 961da177e4SLinus Torvalds { 97496ad9aaSAl Viro struct inode *inode = file_inode(file); 981da177e4SLinus Torvalds loff_t len, vma_len; 991da177e4SLinus Torvalds int ret; 100a5516438SAndi Kleen struct hstate *h = hstate_file(file); 1011da177e4SLinus Torvalds 10268589bc3SHugh Dickins /* 103dec4ad86SDavid Gibson * vma address alignment (but not the pgoff alignment) has 104dec4ad86SDavid Gibson * already been checked by prepare_hugepage_range. If you add 105dec4ad86SDavid Gibson * any error returns here, do so after setting VM_HUGETLB, so 106dec4ad86SDavid Gibson * is_vm_hugetlb_page tests below unmap_region go the right 107dec4ad86SDavid Gibson * way when do_mmap_pgoff unwinds (may be important on powerpc 108dec4ad86SDavid Gibson * and ia64). 10968589bc3SHugh Dickins */ 110a2fce914SNaoya Horiguchi vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; 11168589bc3SHugh Dickins vma->vm_ops = &hugetlb_vm_ops; 1121da177e4SLinus Torvalds 1132b37c35eSBecky Bruce if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) 114dec4ad86SDavid Gibson return -EINVAL; 115dec4ad86SDavid Gibson 1161da177e4SLinus Torvalds vma_len = (loff_t)(vma->vm_end - vma->vm_start); 1171da177e4SLinus Torvalds 1181b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 1191da177e4SLinus Torvalds file_accessed(file); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds ret = -ENOMEM; 1221da177e4SLinus Torvalds len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 1231da177e4SLinus Torvalds 124a1e78772SMel Gorman if (hugetlb_reserve_pages(inode, 125a5516438SAndi Kleen vma->vm_pgoff >> huge_page_order(h), 1265a6fe125SMel Gorman len >> huge_page_shift(h), vma, 1275a6fe125SMel Gorman vma->vm_flags)) 128b45b5bd6SDavid Gibson goto out; 129b45b5bd6SDavid Gibson 1304c887265SAdam Litke ret = 0; 1314c887265SAdam Litke hugetlb_prefault_arch_hook(vma->vm_mm); 132b6174df5SZhang, Yanmin if (vma->vm_flags & VM_WRITE && inode->i_size < len) 1331da177e4SLinus Torvalds inode->i_size = len; 1341da177e4SLinus Torvalds out: 1351b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds return ret; 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* 141508034a3SHugh Dickins * Called under down_write(mmap_sem). 1421da177e4SLinus Torvalds */ 1431da177e4SLinus Torvalds 144d2ba27e8SAdrian Bunk #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 1451da177e4SLinus Torvalds static unsigned long 1461da177e4SLinus Torvalds hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 1471da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, unsigned long flags) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds struct mm_struct *mm = current->mm; 1501da177e4SLinus Torvalds struct vm_area_struct *vma; 151a5516438SAndi Kleen struct hstate *h = hstate_file(file); 15208659355SMichel Lespinasse struct vm_unmapped_area_info info; 1531da177e4SLinus Torvalds 154a5516438SAndi Kleen if (len & ~huge_page_mask(h)) 1551da177e4SLinus Torvalds return -EINVAL; 1561da177e4SLinus Torvalds if (len > TASK_SIZE) 1571da177e4SLinus Torvalds return -ENOMEM; 1581da177e4SLinus Torvalds 159036e0856SBenjamin Herrenschmidt if (flags & MAP_FIXED) { 160a5516438SAndi Kleen if (prepare_hugepage_range(file, addr, len)) 161036e0856SBenjamin Herrenschmidt return -EINVAL; 162036e0856SBenjamin Herrenschmidt return addr; 163036e0856SBenjamin Herrenschmidt } 164036e0856SBenjamin Herrenschmidt 1651da177e4SLinus Torvalds if (addr) { 166a5516438SAndi Kleen addr = ALIGN(addr, huge_page_size(h)); 1671da177e4SLinus Torvalds vma = find_vma(mm, addr); 1681da177e4SLinus Torvalds if (TASK_SIZE - len >= addr && 1691da177e4SLinus Torvalds (!vma || addr + len <= vma->vm_start)) 1701da177e4SLinus Torvalds return addr; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 17308659355SMichel Lespinasse info.flags = 0; 17408659355SMichel Lespinasse info.length = len; 17508659355SMichel Lespinasse info.low_limit = TASK_UNMAPPED_BASE; 17608659355SMichel Lespinasse info.high_limit = TASK_SIZE; 17708659355SMichel Lespinasse info.align_mask = PAGE_MASK & ~huge_page_mask(h); 17808659355SMichel Lespinasse info.align_offset = 0; 17908659355SMichel Lespinasse return vm_unmapped_area(&info); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds #endif 1821da177e4SLinus Torvalds 18334d0640eSAl Viro static size_t 184e63e1e5aSBadari Pulavarty hugetlbfs_read_actor(struct page *page, unsigned long offset, 18534d0640eSAl Viro struct iov_iter *to, unsigned long size) 186e63e1e5aSBadari Pulavarty { 18734d0640eSAl Viro size_t copied = 0; 188e63e1e5aSBadari Pulavarty int i, chunksize; 189e63e1e5aSBadari Pulavarty 190e63e1e5aSBadari Pulavarty /* Find which 4k chunk and offset with in that chunk */ 191e63e1e5aSBadari Pulavarty i = offset >> PAGE_CACHE_SHIFT; 192e63e1e5aSBadari Pulavarty offset = offset & ~PAGE_CACHE_MASK; 193e63e1e5aSBadari Pulavarty 194e63e1e5aSBadari Pulavarty while (size) { 19534d0640eSAl Viro size_t n; 196e63e1e5aSBadari Pulavarty chunksize = PAGE_CACHE_SIZE; 197e63e1e5aSBadari Pulavarty if (offset) 198e63e1e5aSBadari Pulavarty chunksize -= offset; 199e63e1e5aSBadari Pulavarty if (chunksize > size) 200e63e1e5aSBadari Pulavarty chunksize = size; 20134d0640eSAl Viro n = copy_page_to_iter(&page[i], offset, chunksize, to); 20234d0640eSAl Viro copied += n; 20334d0640eSAl Viro if (n != chunksize) 20434d0640eSAl Viro return copied; 205e63e1e5aSBadari Pulavarty offset = 0; 206e63e1e5aSBadari Pulavarty size -= chunksize; 207e63e1e5aSBadari Pulavarty i++; 208e63e1e5aSBadari Pulavarty } 20934d0640eSAl Viro return copied; 210e63e1e5aSBadari Pulavarty } 211e63e1e5aSBadari Pulavarty 212e63e1e5aSBadari Pulavarty /* 213e63e1e5aSBadari Pulavarty * Support for read() - Find the page attached to f_mapping and copy out the 214e63e1e5aSBadari Pulavarty * data. Its *very* similar to do_generic_mapping_read(), we can't use that 215e63e1e5aSBadari Pulavarty * since it has PAGE_CACHE_SIZE assumptions. 216e63e1e5aSBadari Pulavarty */ 21734d0640eSAl Viro static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) 218e63e1e5aSBadari Pulavarty { 21934d0640eSAl Viro struct file *file = iocb->ki_filp; 22034d0640eSAl Viro struct hstate *h = hstate_file(file); 22134d0640eSAl Viro struct address_space *mapping = file->f_mapping; 222e63e1e5aSBadari Pulavarty struct inode *inode = mapping->host; 22334d0640eSAl Viro unsigned long index = iocb->ki_pos >> huge_page_shift(h); 22434d0640eSAl Viro unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); 225e63e1e5aSBadari Pulavarty unsigned long end_index; 226e63e1e5aSBadari Pulavarty loff_t isize; 227e63e1e5aSBadari Pulavarty ssize_t retval = 0; 228e63e1e5aSBadari Pulavarty 22934d0640eSAl Viro while (iov_iter_count(to)) { 230e63e1e5aSBadari Pulavarty struct page *page; 23134d0640eSAl Viro size_t nr, copied; 232e63e1e5aSBadari Pulavarty 233e63e1e5aSBadari Pulavarty /* nr is the maximum number of bytes to copy from this page */ 234a5516438SAndi Kleen nr = huge_page_size(h); 235a05b0855SAneesh Kumar K.V isize = i_size_read(inode); 236a05b0855SAneesh Kumar K.V if (!isize) 23734d0640eSAl Viro break; 238a05b0855SAneesh Kumar K.V end_index = (isize - 1) >> huge_page_shift(h); 239e63e1e5aSBadari Pulavarty if (index > end_index) 24034d0640eSAl Viro break; 24134d0640eSAl Viro if (index == end_index) { 242a5516438SAndi Kleen nr = ((isize - 1) & ~huge_page_mask(h)) + 1; 243a05b0855SAneesh Kumar K.V if (nr <= offset) 24434d0640eSAl Viro break; 245e63e1e5aSBadari Pulavarty } 246e63e1e5aSBadari Pulavarty nr = nr - offset; 247e63e1e5aSBadari Pulavarty 248e63e1e5aSBadari Pulavarty /* Find the page */ 249a05b0855SAneesh Kumar K.V page = find_lock_page(mapping, index); 250e63e1e5aSBadari Pulavarty if (unlikely(page == NULL)) { 251e63e1e5aSBadari Pulavarty /* 252e63e1e5aSBadari Pulavarty * We have a HOLE, zero out the user-buffer for the 253e63e1e5aSBadari Pulavarty * length of the hole or request. 254e63e1e5aSBadari Pulavarty */ 25534d0640eSAl Viro copied = iov_iter_zero(nr, to); 256e63e1e5aSBadari Pulavarty } else { 257a05b0855SAneesh Kumar K.V unlock_page(page); 258a05b0855SAneesh Kumar K.V 259e63e1e5aSBadari Pulavarty /* 260e63e1e5aSBadari Pulavarty * We have the page, copy it to user space buffer. 261e63e1e5aSBadari Pulavarty */ 26234d0640eSAl Viro copied = hugetlbfs_read_actor(page, offset, to, nr); 263a05b0855SAneesh Kumar K.V page_cache_release(page); 264e63e1e5aSBadari Pulavarty } 26534d0640eSAl Viro offset += copied; 26634d0640eSAl Viro retval += copied; 26734d0640eSAl Viro if (copied != nr && iov_iter_count(to)) { 26834d0640eSAl Viro if (!retval) 26934d0640eSAl Viro retval = -EFAULT; 270e63e1e5aSBadari Pulavarty break; 271e63e1e5aSBadari Pulavarty } 27234d0640eSAl Viro index += offset >> huge_page_shift(h); 27334d0640eSAl Viro offset &= ~huge_page_mask(h); 27434d0640eSAl Viro } 27534d0640eSAl Viro iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; 276e63e1e5aSBadari Pulavarty return retval; 277e63e1e5aSBadari Pulavarty } 278e63e1e5aSBadari Pulavarty 279800d15a5SNick Piggin static int hugetlbfs_write_begin(struct file *file, 280800d15a5SNick Piggin struct address_space *mapping, 281800d15a5SNick Piggin loff_t pos, unsigned len, unsigned flags, 282800d15a5SNick Piggin struct page **pagep, void **fsdata) 2831da177e4SLinus Torvalds { 2841da177e4SLinus Torvalds return -EINVAL; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 287800d15a5SNick Piggin static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, 288800d15a5SNick Piggin loff_t pos, unsigned len, unsigned copied, 289800d15a5SNick Piggin struct page *page, void *fsdata) 2901da177e4SLinus Torvalds { 291800d15a5SNick Piggin BUG(); 2921da177e4SLinus Torvalds return -EINVAL; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static void truncate_huge_page(struct page *page) 2961da177e4SLinus Torvalds { 297fba2591bSLinus Torvalds cancel_dirty_page(page, /* No IO accounting for huge pages? */0); 2981da177e4SLinus Torvalds ClearPageUptodate(page); 299bd65cb86SMinchan Kim delete_from_page_cache(page); 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 302b45b5bd6SDavid Gibson static void truncate_hugepages(struct inode *inode, loff_t lstart) 3031da177e4SLinus Torvalds { 304a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 305b45b5bd6SDavid Gibson struct address_space *mapping = &inode->i_data; 306a5516438SAndi Kleen const pgoff_t start = lstart >> huge_page_shift(h); 3071da177e4SLinus Torvalds struct pagevec pvec; 3081da177e4SLinus Torvalds pgoff_t next; 309a43a8c39SChen, Kenneth W int i, freed = 0; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds pagevec_init(&pvec, 0); 3121da177e4SLinus Torvalds next = start; 3131da177e4SLinus Torvalds while (1) { 3141da177e4SLinus Torvalds if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 3151da177e4SLinus Torvalds if (next == start) 3161da177e4SLinus Torvalds break; 3171da177e4SLinus Torvalds next = start; 3181da177e4SLinus Torvalds continue; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); ++i) { 3221da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds lock_page(page); 3251da177e4SLinus Torvalds if (page->index > next) 3261da177e4SLinus Torvalds next = page->index; 3271da177e4SLinus Torvalds ++next; 3281da177e4SLinus Torvalds truncate_huge_page(page); 3291da177e4SLinus Torvalds unlock_page(page); 330a43a8c39SChen, Kenneth W freed++; 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds huge_pagevec_release(&pvec); 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds BUG_ON(!lstart && mapping->nrpages); 335a43a8c39SChen, Kenneth W hugetlb_unreserve_pages(inode, start, freed); 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 3382bbbda30SAl Viro static void hugetlbfs_evict_inode(struct inode *inode) 3391da177e4SLinus Torvalds { 3409119a41eSJoonsoo Kim struct resv_map *resv_map; 3419119a41eSJoonsoo Kim 342b45b5bd6SDavid Gibson truncate_hugepages(inode, 0); 3439119a41eSJoonsoo Kim resv_map = (struct resv_map *)inode->i_mapping->private_data; 3449119a41eSJoonsoo Kim /* root inode doesn't have the resv_map, so we should check it */ 3459119a41eSJoonsoo Kim if (resv_map) 3469119a41eSJoonsoo Kim resv_map_release(&resv_map->refs); 347dbd5768fSJan Kara clear_inode(inode); 348149f4211SChristoph Hellwig } 349149f4211SChristoph Hellwig 3501da177e4SLinus Torvalds static inline void 3516b2dbba8SMichel Lespinasse hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff) 3521da177e4SLinus Torvalds { 3531da177e4SLinus Torvalds struct vm_area_struct *vma; 3541da177e4SLinus Torvalds 3556b2dbba8SMichel Lespinasse vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) { 3561da177e4SLinus Torvalds unsigned long v_offset; 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* 359856fc295SHugh Dickins * Can the expression below overflow on 32-bit arches? 3606b2dbba8SMichel Lespinasse * No, because the interval tree returns us only those vmas 361856fc295SHugh Dickins * which overlap the truncated area starting at pgoff, 362856fc295SHugh Dickins * and no vma on a 32-bit arch can span beyond the 4GB. 3631da177e4SLinus Torvalds */ 364856fc295SHugh Dickins if (vma->vm_pgoff < pgoff) 365856fc295SHugh Dickins v_offset = (pgoff - vma->vm_pgoff) << PAGE_SHIFT; 366856fc295SHugh Dickins else 3671da177e4SLinus Torvalds v_offset = 0; 3681da177e4SLinus Torvalds 36924669e58SAneesh Kumar K.V unmap_hugepage_range(vma, vma->vm_start + v_offset, 37024669e58SAneesh Kumar K.V vma->vm_end, NULL); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) 3751da177e4SLinus Torvalds { 376856fc295SHugh Dickins pgoff_t pgoff; 3771da177e4SLinus Torvalds struct address_space *mapping = inode->i_mapping; 378a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 3791da177e4SLinus Torvalds 380a5516438SAndi Kleen BUG_ON(offset & ~huge_page_mask(h)); 381856fc295SHugh Dickins pgoff = offset >> PAGE_SHIFT; 3821da177e4SLinus Torvalds 3837aa91e10SKen Chen i_size_write(inode, offset); 38483cde9e8SDavidlohr Bueso i_mmap_lock_write(mapping); 3856b2dbba8SMichel Lespinasse if (!RB_EMPTY_ROOT(&mapping->i_mmap)) 3861da177e4SLinus Torvalds hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff); 38783cde9e8SDavidlohr Bueso i_mmap_unlock_write(mapping); 388b45b5bd6SDavid Gibson truncate_hugepages(inode, offset); 3891da177e4SLinus Torvalds return 0; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) 3931da177e4SLinus Torvalds { 3942b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 395a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 3961da177e4SLinus Torvalds int error; 3971da177e4SLinus Torvalds unsigned int ia_valid = attr->ia_valid; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds BUG_ON(!inode); 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds error = inode_change_ok(inode, attr); 4021da177e4SLinus Torvalds if (error) 4031025774cSChristoph Hellwig return error; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds if (ia_valid & ATTR_SIZE) { 4061da177e4SLinus Torvalds error = -EINVAL; 4071025774cSChristoph Hellwig if (attr->ia_size & ~huge_page_mask(h)) 4081025774cSChristoph Hellwig return -EINVAL; 4091da177e4SLinus Torvalds error = hugetlb_vmtruncate(inode, attr->ia_size); 4101da177e4SLinus Torvalds if (error) 4111da177e4SLinus Torvalds return error; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141025774cSChristoph Hellwig setattr_copy(inode, attr); 4151025774cSChristoph Hellwig mark_inode_dirty(inode); 4161025774cSChristoph Hellwig return 0; 4171025774cSChristoph Hellwig } 4181025774cSChristoph Hellwig 4197d54fa64SAl Viro static struct inode *hugetlbfs_get_root(struct super_block *sb, 4207d54fa64SAl Viro struct hugetlbfs_config *config) 4211da177e4SLinus Torvalds { 4221da177e4SLinus Torvalds struct inode *inode; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds inode = new_inode(sb); 4251da177e4SLinus Torvalds if (inode) { 4261da177e4SLinus Torvalds struct hugetlbfs_inode_info *info; 42785fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 4287d54fa64SAl Viro inode->i_mode = S_IFDIR | config->mode; 4297d54fa64SAl Viro inode->i_uid = config->uid; 4307d54fa64SAl Viro inode->i_gid = config->gid; 4317d54fa64SAl Viro inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4327d54fa64SAl Viro info = HUGETLBFS_I(inode); 4337d54fa64SAl Viro mpol_shared_policy_init(&info->policy, NULL); 4347d54fa64SAl Viro inode->i_op = &hugetlbfs_dir_inode_operations; 4357d54fa64SAl Viro inode->i_fop = &simple_dir_operations; 4367d54fa64SAl Viro /* directory inodes start off with i_nlink == 2 (for "." entry) */ 4377d54fa64SAl Viro inc_nlink(inode); 43865ed7601SAneesh Kumar K.V lockdep_annotate_inode_mutex_key(inode); 4397d54fa64SAl Viro } 4407d54fa64SAl Viro return inode; 4417d54fa64SAl Viro } 4427d54fa64SAl Viro 443b610ded7SMichal Hocko /* 444c8c06efaSDavidlohr Bueso * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never 445b610ded7SMichal Hocko * be taken from reclaim -- unlike regular filesystems. This needs an 446b610ded7SMichal Hocko * annotation because huge_pmd_share() does an allocation under 447c8c06efaSDavidlohr Bueso * i_mmap_rwsem. 448b610ded7SMichal Hocko */ 449c8c06efaSDavidlohr Bueso static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; 450b610ded7SMichal Hocko 4517d54fa64SAl Viro static struct inode *hugetlbfs_get_inode(struct super_block *sb, 4527d54fa64SAl Viro struct inode *dir, 45318df2252SAl Viro umode_t mode, dev_t dev) 4547d54fa64SAl Viro { 4557d54fa64SAl Viro struct inode *inode; 4569119a41eSJoonsoo Kim struct resv_map *resv_map; 4579119a41eSJoonsoo Kim 4589119a41eSJoonsoo Kim resv_map = resv_map_alloc(); 4599119a41eSJoonsoo Kim if (!resv_map) 4609119a41eSJoonsoo Kim return NULL; 4617d54fa64SAl Viro 4627d54fa64SAl Viro inode = new_inode(sb); 4637d54fa64SAl Viro if (inode) { 4647d54fa64SAl Viro struct hugetlbfs_inode_info *info; 4657d54fa64SAl Viro inode->i_ino = get_next_ino(); 4667d54fa64SAl Viro inode_init_owner(inode, dir, mode); 467c8c06efaSDavidlohr Bueso lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, 468c8c06efaSDavidlohr Bueso &hugetlbfs_i_mmap_rwsem_key); 4691da177e4SLinus Torvalds inode->i_mapping->a_ops = &hugetlbfs_aops; 4701da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4719119a41eSJoonsoo Kim inode->i_mapping->private_data = resv_map; 4721da177e4SLinus Torvalds info = HUGETLBFS_I(inode); 4736bfde05bSEric B Munson /* 4746bfde05bSEric B Munson * The policy is initialized here even if we are creating a 4756bfde05bSEric B Munson * private inode because initialization simply creates an 4766bfde05bSEric B Munson * an empty rb tree and calls spin_lock_init(), later when we 4776bfde05bSEric B Munson * call mpol_free_shared_policy() it will just return because 4786bfde05bSEric B Munson * the rb tree will still be empty. 4796bfde05bSEric B Munson */ 48071fe804bSLee Schermerhorn mpol_shared_policy_init(&info->policy, NULL); 4811da177e4SLinus Torvalds switch (mode & S_IFMT) { 4821da177e4SLinus Torvalds default: 4831da177e4SLinus Torvalds init_special_inode(inode, mode, dev); 4841da177e4SLinus Torvalds break; 4851da177e4SLinus Torvalds case S_IFREG: 4861da177e4SLinus Torvalds inode->i_op = &hugetlbfs_inode_operations; 4871da177e4SLinus Torvalds inode->i_fop = &hugetlbfs_file_operations; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds case S_IFDIR: 4901da177e4SLinus Torvalds inode->i_op = &hugetlbfs_dir_inode_operations; 4911da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds /* directory inodes start off with i_nlink == 2 (for "." entry) */ 494d8c76e6fSDave Hansen inc_nlink(inode); 4951da177e4SLinus Torvalds break; 4961da177e4SLinus Torvalds case S_IFLNK: 4971da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 4981da177e4SLinus Torvalds break; 4991da177e4SLinus Torvalds } 500e096d0c7SJosh Boyer lockdep_annotate_inode_mutex_key(inode); 5019119a41eSJoonsoo Kim } else 5029119a41eSJoonsoo Kim kref_put(&resv_map->refs, resv_map_release); 5039119a41eSJoonsoo Kim 5041da177e4SLinus Torvalds return inode; 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /* 5081da177e4SLinus Torvalds * File creation. Allocate an inode, and we're done.. 5091da177e4SLinus Torvalds */ 5101da177e4SLinus Torvalds static int hugetlbfs_mknod(struct inode *dir, 5111a67aafbSAl Viro struct dentry *dentry, umode_t mode, dev_t dev) 5121da177e4SLinus Torvalds { 5131da177e4SLinus Torvalds struct inode *inode; 5141da177e4SLinus Torvalds int error = -ENOSPC; 5151da177e4SLinus Torvalds 5167d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); 5171da177e4SLinus Torvalds if (inode) { 5181da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5191da177e4SLinus Torvalds d_instantiate(dentry, inode); 5201da177e4SLinus Torvalds dget(dentry); /* Extra count - pin the dentry in core */ 5211da177e4SLinus Torvalds error = 0; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds return error; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 52618bb1db3SAl Viro static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 5271da177e4SLinus Torvalds { 5281da177e4SLinus Torvalds int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0); 5291da177e4SLinus Torvalds if (!retval) 530d8c76e6fSDave Hansen inc_nlink(dir); 5311da177e4SLinus Torvalds return retval; 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 534ebfc3b49SAl Viro static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) 5351da177e4SLinus Torvalds { 5361da177e4SLinus Torvalds return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0); 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds static int hugetlbfs_symlink(struct inode *dir, 5401da177e4SLinus Torvalds struct dentry *dentry, const char *symname) 5411da177e4SLinus Torvalds { 5421da177e4SLinus Torvalds struct inode *inode; 5431da177e4SLinus Torvalds int error = -ENOSPC; 5441da177e4SLinus Torvalds 5457d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); 5461da177e4SLinus Torvalds if (inode) { 5471da177e4SLinus Torvalds int l = strlen(symname)+1; 5481da177e4SLinus Torvalds error = page_symlink(inode, symname, l); 5491da177e4SLinus Torvalds if (!error) { 5501da177e4SLinus Torvalds d_instantiate(dentry, inode); 5511da177e4SLinus Torvalds dget(dentry); 5521da177e4SLinus Torvalds } else 5531da177e4SLinus Torvalds iput(inode); 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds dir->i_ctime = dir->i_mtime = CURRENT_TIME; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds return error; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds /* 5616649a386SKen Chen * mark the head page dirty 5621da177e4SLinus Torvalds */ 5631da177e4SLinus Torvalds static int hugetlbfs_set_page_dirty(struct page *page) 5641da177e4SLinus Torvalds { 565d85f3385SChristoph Lameter struct page *head = compound_head(page); 5666649a386SKen Chen 5676649a386SKen Chen SetPageDirty(head); 5681da177e4SLinus Torvalds return 0; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 571290408d4SNaoya Horiguchi static int hugetlbfs_migrate_page(struct address_space *mapping, 572b969c4abSMel Gorman struct page *newpage, struct page *page, 573a6bc32b8SMel Gorman enum migrate_mode mode) 574290408d4SNaoya Horiguchi { 575290408d4SNaoya Horiguchi int rc; 576290408d4SNaoya Horiguchi 577290408d4SNaoya Horiguchi rc = migrate_huge_page_move_mapping(mapping, newpage, page); 57878bd5209SRafael Aquini if (rc != MIGRATEPAGE_SUCCESS) 579290408d4SNaoya Horiguchi return rc; 580290408d4SNaoya Horiguchi migrate_page_copy(newpage, page); 581290408d4SNaoya Horiguchi 58278bd5209SRafael Aquini return MIGRATEPAGE_SUCCESS; 583290408d4SNaoya Horiguchi } 584290408d4SNaoya Horiguchi 585726c3342SDavid Howells static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) 5861da177e4SLinus Torvalds { 587726c3342SDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); 5882b0143b5SDavid Howells struct hstate *h = hstate_inode(d_inode(dentry)); 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds buf->f_type = HUGETLBFS_MAGIC; 591a5516438SAndi Kleen buf->f_bsize = huge_page_size(h); 5921da177e4SLinus Torvalds if (sbinfo) { 5931da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 59474a8a65cSDavid Gibson /* If no limits set, just report 0 for max/free/used 59574a8a65cSDavid Gibson * blocks, like simple_statfs() */ 59690481622SDavid Gibson if (sbinfo->spool) { 59790481622SDavid Gibson long free_pages; 59890481622SDavid Gibson 59990481622SDavid Gibson spin_lock(&sbinfo->spool->lock); 60090481622SDavid Gibson buf->f_blocks = sbinfo->spool->max_hpages; 60190481622SDavid Gibson free_pages = sbinfo->spool->max_hpages 60290481622SDavid Gibson - sbinfo->spool->used_hpages; 60390481622SDavid Gibson buf->f_bavail = buf->f_bfree = free_pages; 60490481622SDavid Gibson spin_unlock(&sbinfo->spool->lock); 6051da177e4SLinus Torvalds buf->f_files = sbinfo->max_inodes; 6061da177e4SLinus Torvalds buf->f_ffree = sbinfo->free_inodes; 60774a8a65cSDavid Gibson } 6081da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds buf->f_namelen = NAME_MAX; 6111da177e4SLinus Torvalds return 0; 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds static void hugetlbfs_put_super(struct super_block *sb) 6151da177e4SLinus Torvalds { 6161da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (sbi) { 6191da177e4SLinus Torvalds sb->s_fs_info = NULL; 62090481622SDavid Gibson 62190481622SDavid Gibson if (sbi->spool) 62290481622SDavid Gibson hugepage_put_subpool(sbi->spool); 62390481622SDavid Gibson 6241da177e4SLinus Torvalds kfree(sbi); 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds } 6271da177e4SLinus Torvalds 62896527980SChristoph Hellwig static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) 62996527980SChristoph Hellwig { 63096527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 63196527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 63296527980SChristoph Hellwig if (unlikely(!sbinfo->free_inodes)) { 63396527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 63496527980SChristoph Hellwig return 0; 63596527980SChristoph Hellwig } 63696527980SChristoph Hellwig sbinfo->free_inodes--; 63796527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 63896527980SChristoph Hellwig } 63996527980SChristoph Hellwig 64096527980SChristoph Hellwig return 1; 64196527980SChristoph Hellwig } 64296527980SChristoph Hellwig 64396527980SChristoph Hellwig static void hugetlbfs_inc_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 sbinfo->free_inodes++; 64896527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 64996527980SChristoph Hellwig } 65096527980SChristoph Hellwig } 65196527980SChristoph Hellwig 65296527980SChristoph Hellwig 653e18b890bSChristoph Lameter static struct kmem_cache *hugetlbfs_inode_cachep; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) 6561da177e4SLinus Torvalds { 65796527980SChristoph Hellwig struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); 6581da177e4SLinus Torvalds struct hugetlbfs_inode_info *p; 6591da177e4SLinus Torvalds 66096527980SChristoph Hellwig if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) 6611da177e4SLinus Torvalds return NULL; 662e94b1766SChristoph Lameter p = kmem_cache_alloc(hugetlbfs_inode_cachep, GFP_KERNEL); 66396527980SChristoph Hellwig if (unlikely(!p)) { 66496527980SChristoph Hellwig hugetlbfs_inc_free_inodes(sbinfo); 66596527980SChristoph Hellwig return NULL; 6661da177e4SLinus Torvalds } 66796527980SChristoph Hellwig return &p->vfs_inode; 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 670fa0d7e3dSNick Piggin static void hugetlbfs_i_callback(struct rcu_head *head) 671fa0d7e3dSNick Piggin { 672fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 673fa0d7e3dSNick Piggin kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); 674fa0d7e3dSNick Piggin } 675fa0d7e3dSNick Piggin 6761da177e4SLinus Torvalds static void hugetlbfs_destroy_inode(struct inode *inode) 6771da177e4SLinus Torvalds { 67896527980SChristoph Hellwig hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); 6791da177e4SLinus Torvalds mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); 680fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, hugetlbfs_i_callback); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 683f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops = { 684800d15a5SNick Piggin .write_begin = hugetlbfs_write_begin, 685800d15a5SNick Piggin .write_end = hugetlbfs_write_end, 6861da177e4SLinus Torvalds .set_page_dirty = hugetlbfs_set_page_dirty, 687290408d4SNaoya Horiguchi .migratepage = hugetlbfs_migrate_page, 6881da177e4SLinus Torvalds }; 6891da177e4SLinus Torvalds 69096527980SChristoph Hellwig 69151cc5068SAlexey Dobriyan static void init_once(void *foo) 69296527980SChristoph Hellwig { 69396527980SChristoph Hellwig struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; 69496527980SChristoph Hellwig 69596527980SChristoph Hellwig inode_init_once(&ei->vfs_inode); 69696527980SChristoph Hellwig } 69796527980SChristoph Hellwig 6984b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations = { 69934d0640eSAl Viro .read_iter = hugetlbfs_read_iter, 7001da177e4SLinus Torvalds .mmap = hugetlbfs_file_mmap, 7011b061d92SChristoph Hellwig .fsync = noop_fsync, 7021da177e4SLinus Torvalds .get_unmapped_area = hugetlb_get_unmapped_area, 7036038f373SArnd Bergmann .llseek = default_llseek, 7041da177e4SLinus Torvalds }; 7051da177e4SLinus Torvalds 70692e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations = { 7071da177e4SLinus Torvalds .create = hugetlbfs_create, 7081da177e4SLinus Torvalds .lookup = simple_lookup, 7091da177e4SLinus Torvalds .link = simple_link, 7101da177e4SLinus Torvalds .unlink = simple_unlink, 7111da177e4SLinus Torvalds .symlink = hugetlbfs_symlink, 7121da177e4SLinus Torvalds .mkdir = hugetlbfs_mkdir, 7131da177e4SLinus Torvalds .rmdir = simple_rmdir, 7141da177e4SLinus Torvalds .mknod = hugetlbfs_mknod, 7151da177e4SLinus Torvalds .rename = simple_rename, 7161da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7171da177e4SLinus Torvalds }; 7181da177e4SLinus Torvalds 71992e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations = { 7201da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 7211da177e4SLinus Torvalds }; 7221da177e4SLinus Torvalds 723ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops = { 7241da177e4SLinus Torvalds .alloc_inode = hugetlbfs_alloc_inode, 7251da177e4SLinus Torvalds .destroy_inode = hugetlbfs_destroy_inode, 7262bbbda30SAl Viro .evict_inode = hugetlbfs_evict_inode, 7271da177e4SLinus Torvalds .statfs = hugetlbfs_statfs, 7281da177e4SLinus Torvalds .put_super = hugetlbfs_put_super, 72910f19a86SMiklos Szeredi .show_options = generic_show_options, 7301da177e4SLinus Torvalds }; 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds static int 7331da177e4SLinus Torvalds hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 7341da177e4SLinus Torvalds { 735e73a75faSRandy Dunlap char *p, *rest; 736e73a75faSRandy Dunlap substring_t args[MAX_OPT_ARGS]; 737e73a75faSRandy Dunlap int option; 738a137e1ccSAndi Kleen unsigned long long size = 0; 739a137e1ccSAndi Kleen enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds if (!options) 7421da177e4SLinus Torvalds return 0; 7431da177e4SLinus Torvalds 744e73a75faSRandy Dunlap while ((p = strsep(&options, ",")) != NULL) { 745e73a75faSRandy Dunlap int token; 746b4c07bceSLee Schermerhorn if (!*p) 747b4c07bceSLee Schermerhorn continue; 7481da177e4SLinus Torvalds 749e73a75faSRandy Dunlap token = match_token(p, tokens, args); 750e73a75faSRandy Dunlap switch (token) { 751e73a75faSRandy Dunlap case Opt_uid: 752e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 753e73a75faSRandy Dunlap goto bad_val; 754a0eb3a05SEric W. Biederman pconfig->uid = make_kuid(current_user_ns(), option); 755a0eb3a05SEric W. Biederman if (!uid_valid(pconfig->uid)) 756a0eb3a05SEric W. Biederman goto bad_val; 757e73a75faSRandy Dunlap break; 758e73a75faSRandy Dunlap 759e73a75faSRandy Dunlap case Opt_gid: 760e73a75faSRandy Dunlap if (match_int(&args[0], &option)) 761e73a75faSRandy Dunlap goto bad_val; 762a0eb3a05SEric W. Biederman pconfig->gid = make_kgid(current_user_ns(), option); 763a0eb3a05SEric W. Biederman if (!gid_valid(pconfig->gid)) 764a0eb3a05SEric W. Biederman goto bad_val; 765e73a75faSRandy Dunlap break; 766e73a75faSRandy Dunlap 767e73a75faSRandy Dunlap case Opt_mode: 768e73a75faSRandy Dunlap if (match_octal(&args[0], &option)) 769e73a75faSRandy Dunlap goto bad_val; 77075897d60SKen Chen pconfig->mode = option & 01777U; 771e73a75faSRandy Dunlap break; 772e73a75faSRandy Dunlap 773e73a75faSRandy Dunlap case Opt_size: { 774e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 775e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 776e73a75faSRandy Dunlap goto bad_val; 777e73a75faSRandy Dunlap size = memparse(args[0].from, &rest); 778a137e1ccSAndi Kleen setsize = SIZE_STD; 779a137e1ccSAndi Kleen if (*rest == '%') 780a137e1ccSAndi Kleen setsize = SIZE_PERCENT; 781e73a75faSRandy Dunlap break; 782e73a75faSRandy Dunlap } 7831da177e4SLinus Torvalds 784e73a75faSRandy Dunlap case Opt_nr_inodes: 785e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 786e73a75faSRandy Dunlap if (!isdigit(*args[0].from)) 787e73a75faSRandy Dunlap goto bad_val; 788e73a75faSRandy Dunlap pconfig->nr_inodes = memparse(args[0].from, &rest); 789e73a75faSRandy Dunlap break; 790e73a75faSRandy Dunlap 791a137e1ccSAndi Kleen case Opt_pagesize: { 792a137e1ccSAndi Kleen unsigned long ps; 793a137e1ccSAndi Kleen ps = memparse(args[0].from, &rest); 794a137e1ccSAndi Kleen pconfig->hstate = size_to_hstate(ps); 795a137e1ccSAndi Kleen if (!pconfig->hstate) { 7969b857d26SAndrew Morton pr_err("Unsupported page size %lu MB\n", 797a137e1ccSAndi Kleen ps >> 20); 798a137e1ccSAndi Kleen return -EINVAL; 799a137e1ccSAndi Kleen } 800a137e1ccSAndi Kleen break; 801a137e1ccSAndi Kleen } 802a137e1ccSAndi Kleen 803e73a75faSRandy Dunlap default: 8049b857d26SAndrew Morton pr_err("Bad mount option: \"%s\"\n", p); 805b4c07bceSLee Schermerhorn return -EINVAL; 806e73a75faSRandy Dunlap break; 807e73a75faSRandy Dunlap } 8081da177e4SLinus Torvalds } 809a137e1ccSAndi Kleen 810a137e1ccSAndi Kleen /* Do size after hstate is set up */ 811a137e1ccSAndi Kleen if (setsize > NO_SIZE) { 812a137e1ccSAndi Kleen struct hstate *h = pconfig->hstate; 813a137e1ccSAndi Kleen if (setsize == SIZE_PERCENT) { 814a137e1ccSAndi Kleen size <<= huge_page_shift(h); 815a137e1ccSAndi Kleen size *= h->max_huge_pages; 816a137e1ccSAndi Kleen do_div(size, 100); 817a137e1ccSAndi Kleen } 818a137e1ccSAndi Kleen pconfig->nr_blocks = (size >> huge_page_shift(h)); 819a137e1ccSAndi Kleen } 820a137e1ccSAndi Kleen 8211da177e4SLinus Torvalds return 0; 822e73a75faSRandy Dunlap 823e73a75faSRandy Dunlap bad_val: 8249b857d26SAndrew Morton pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p); 825c12ddba0SAkinobu Mita return -EINVAL; 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds static int 8291da177e4SLinus Torvalds hugetlbfs_fill_super(struct super_block *sb, void *data, int silent) 8301da177e4SLinus Torvalds { 8311da177e4SLinus Torvalds int ret; 8321da177e4SLinus Torvalds struct hugetlbfs_config config; 8331da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo; 8341da177e4SLinus Torvalds 83510f19a86SMiklos Szeredi save_mount_options(sb, data); 83610f19a86SMiklos Szeredi 8371da177e4SLinus Torvalds config.nr_blocks = -1; /* No limit on size by default */ 8381da177e4SLinus Torvalds config.nr_inodes = -1; /* No limit on number of inodes by default */ 83977c70de1SDavid Howells config.uid = current_fsuid(); 84077c70de1SDavid Howells config.gid = current_fsgid(); 8411da177e4SLinus Torvalds config.mode = 0755; 842a137e1ccSAndi Kleen config.hstate = &default_hstate; 8431da177e4SLinus Torvalds ret = hugetlbfs_parse_options(data, &config); 8441da177e4SLinus Torvalds if (ret) 8451da177e4SLinus Torvalds return ret; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); 8481da177e4SLinus Torvalds if (!sbinfo) 8491da177e4SLinus Torvalds return -ENOMEM; 8501da177e4SLinus Torvalds sb->s_fs_info = sbinfo; 851a137e1ccSAndi Kleen sbinfo->hstate = config.hstate; 8521da177e4SLinus Torvalds spin_lock_init(&sbinfo->stat_lock); 8531da177e4SLinus Torvalds sbinfo->max_inodes = config.nr_inodes; 8541da177e4SLinus Torvalds sbinfo->free_inodes = config.nr_inodes; 85590481622SDavid Gibson sbinfo->spool = NULL; 85690481622SDavid Gibson if (config.nr_blocks != -1) { 85790481622SDavid Gibson sbinfo->spool = hugepage_new_subpool(config.nr_blocks); 85890481622SDavid Gibson if (!sbinfo->spool) 85990481622SDavid Gibson goto out_free; 86090481622SDavid Gibson } 8611da177e4SLinus Torvalds sb->s_maxbytes = MAX_LFS_FILESIZE; 862a137e1ccSAndi Kleen sb->s_blocksize = huge_page_size(config.hstate); 863a137e1ccSAndi Kleen sb->s_blocksize_bits = huge_page_shift(config.hstate); 8641da177e4SLinus Torvalds sb->s_magic = HUGETLBFS_MAGIC; 8651da177e4SLinus Torvalds sb->s_op = &hugetlbfs_ops; 8661da177e4SLinus Torvalds sb->s_time_gran = 1; 86748fde701SAl Viro sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config)); 86848fde701SAl Viro if (!sb->s_root) 8691da177e4SLinus Torvalds goto out_free; 8701da177e4SLinus Torvalds return 0; 8711da177e4SLinus Torvalds out_free: 87290481622SDavid Gibson kfree(sbinfo->spool); 8731da177e4SLinus Torvalds kfree(sbinfo); 8741da177e4SLinus Torvalds return -ENOMEM; 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 8773c26ff6eSAl Viro static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type, 8783c26ff6eSAl Viro int flags, const char *dev_name, void *data) 8791da177e4SLinus Torvalds { 8803c26ff6eSAl Viro return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super); 8811da177e4SLinus Torvalds } 8821da177e4SLinus Torvalds 8831da177e4SLinus Torvalds static struct file_system_type hugetlbfs_fs_type = { 8841da177e4SLinus Torvalds .name = "hugetlbfs", 8853c26ff6eSAl Viro .mount = hugetlbfs_mount, 8861da177e4SLinus Torvalds .kill_sb = kill_litter_super, 8871da177e4SLinus Torvalds }; 8887f78e035SEric W. Biederman MODULE_ALIAS_FS("hugetlbfs"); 8891da177e4SLinus Torvalds 89042d7395fSAndi Kleen static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; 8911da177e4SLinus Torvalds 892ef1ff6b8SFrom: Mel Gorman static int can_do_hugetlb_shm(void) 8931da177e4SLinus Torvalds { 894a0eb3a05SEric W. Biederman kgid_t shm_group; 895a0eb3a05SEric W. Biederman shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); 896a0eb3a05SEric W. Biederman return capable(CAP_IPC_LOCK) || in_group_p(shm_group); 8971da177e4SLinus Torvalds } 8981da177e4SLinus Torvalds 89942d7395fSAndi Kleen static int get_hstate_idx(int page_size_log) 90042d7395fSAndi Kleen { 901af73e4d9SNaoya Horiguchi struct hstate *h = hstate_sizelog(page_size_log); 90242d7395fSAndi Kleen 90342d7395fSAndi Kleen if (!h) 90442d7395fSAndi Kleen return -1; 90542d7395fSAndi Kleen return h - hstates; 90642d7395fSAndi Kleen } 90742d7395fSAndi Kleen 908be1d2cf5SFabian Frederick static const struct dentry_operations anon_ops = { 909118b2302SAl Viro .d_dname = simple_dname 9100df4d6e5SAl Viro }; 9110df4d6e5SAl Viro 912af73e4d9SNaoya Horiguchi /* 913af73e4d9SNaoya Horiguchi * Note that size should be aligned to proper hugepage size in caller side, 914af73e4d9SNaoya Horiguchi * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. 915af73e4d9SNaoya Horiguchi */ 916af73e4d9SNaoya Horiguchi struct file *hugetlb_file_setup(const char *name, size_t size, 917af73e4d9SNaoya Horiguchi vm_flags_t acctflag, struct user_struct **user, 91842d7395fSAndi Kleen int creat_flags, int page_size_log) 9191da177e4SLinus Torvalds { 92039b65252SAnatol Pomozov struct file *file = ERR_PTR(-ENOMEM); 9211da177e4SLinus Torvalds struct inode *inode; 9222c48b9c4SAl Viro struct path path; 9230df4d6e5SAl Viro struct super_block *sb; 9241da177e4SLinus Torvalds struct qstr quick_string; 92542d7395fSAndi Kleen int hstate_idx; 92642d7395fSAndi Kleen 92742d7395fSAndi Kleen hstate_idx = get_hstate_idx(page_size_log); 92842d7395fSAndi Kleen if (hstate_idx < 0) 92942d7395fSAndi Kleen return ERR_PTR(-ENODEV); 9301da177e4SLinus Torvalds 931353d5c30SHugh Dickins *user = NULL; 93242d7395fSAndi Kleen if (!hugetlbfs_vfsmount[hstate_idx]) 9335bc98594SAkinobu Mita return ERR_PTR(-ENOENT); 9345bc98594SAkinobu Mita 935ef1ff6b8SFrom: Mel Gorman if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { 936353d5c30SHugh Dickins *user = current_user(); 937353d5c30SHugh Dickins if (user_shm_lock(size, *user)) { 93821a3c273SDavid Rientjes task_lock(current); 9399b857d26SAndrew Morton pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", 94021a3c273SDavid Rientjes current->comm, current->pid); 94121a3c273SDavid Rientjes task_unlock(current); 942353d5c30SHugh Dickins } else { 943353d5c30SHugh Dickins *user = NULL; 9441da177e4SLinus Torvalds return ERR_PTR(-EPERM); 9452584e517SRavikiran G Thirumalai } 946353d5c30SHugh Dickins } 9471da177e4SLinus Torvalds 9480df4d6e5SAl Viro sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb; 9499d66586fSEric W. Biederman quick_string.name = name; 9501da177e4SLinus Torvalds quick_string.len = strlen(quick_string.name); 9511da177e4SLinus Torvalds quick_string.hash = 0; 9520df4d6e5SAl Viro path.dentry = d_alloc_pseudo(sb, &quick_string); 9532c48b9c4SAl Viro if (!path.dentry) 9541da177e4SLinus Torvalds goto out_shm_unlock; 9551da177e4SLinus Torvalds 9560df4d6e5SAl Viro d_set_d_op(path.dentry, &anon_ops); 95742d7395fSAndi Kleen path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); 95839b65252SAnatol Pomozov file = ERR_PTR(-ENOSPC); 9590df4d6e5SAl Viro inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0); 9601da177e4SLinus Torvalds if (!inode) 961ce8d2cdfSDave Hansen goto out_dentry; 9621da177e4SLinus Torvalds 96339b65252SAnatol Pomozov file = ERR_PTR(-ENOMEM); 964af73e4d9SNaoya Horiguchi if (hugetlb_reserve_pages(inode, 0, 965af73e4d9SNaoya Horiguchi size >> huge_page_shift(hstate_inode(inode)), NULL, 966af73e4d9SNaoya Horiguchi acctflag)) 967b45b5bd6SDavid Gibson goto out_inode; 968b45b5bd6SDavid Gibson 9692c48b9c4SAl Viro d_instantiate(path.dentry, inode); 9701da177e4SLinus Torvalds inode->i_size = size; 9716d6b77f1SMiklos Szeredi clear_nlink(inode); 972ce8d2cdfSDave Hansen 9732c48b9c4SAl Viro file = alloc_file(&path, FMODE_WRITE | FMODE_READ, 974ce8d2cdfSDave Hansen &hugetlbfs_file_operations); 97539b65252SAnatol Pomozov if (IS_ERR(file)) 976b4d232e6SAl Viro goto out_dentry; /* inode is already attached */ 977ce8d2cdfSDave Hansen 9781da177e4SLinus Torvalds return file; 9791da177e4SLinus Torvalds 980b45b5bd6SDavid Gibson out_inode: 981b45b5bd6SDavid Gibson iput(inode); 9821da177e4SLinus Torvalds out_dentry: 9832c48b9c4SAl Viro path_put(&path); 9841da177e4SLinus Torvalds out_shm_unlock: 985353d5c30SHugh Dickins if (*user) { 986353d5c30SHugh Dickins user_shm_unlock(size, *user); 987353d5c30SHugh Dickins *user = NULL; 988353d5c30SHugh Dickins } 98939b65252SAnatol Pomozov return file; 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds static int __init init_hugetlbfs_fs(void) 9931da177e4SLinus Torvalds { 99442d7395fSAndi Kleen struct hstate *h; 9951da177e4SLinus Torvalds int error; 99642d7395fSAndi Kleen int i; 9971da177e4SLinus Torvalds 998457c1b27SNishanth Aravamudan if (!hugepages_supported()) { 9999b857d26SAndrew Morton pr_info("disabling because there are no supported hugepage sizes\n"); 1000457c1b27SNishanth Aravamudan return -ENOTSUPP; 1001457c1b27SNishanth Aravamudan } 1002457c1b27SNishanth Aravamudan 1003d1d5e05fSHillf Danton error = -ENOMEM; 10041da177e4SLinus Torvalds hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", 10051da177e4SLinus Torvalds sizeof(struct hugetlbfs_inode_info), 100620c2df83SPaul Mundt 0, 0, init_once); 10071da177e4SLinus Torvalds if (hugetlbfs_inode_cachep == NULL) 1008e0bf68ddSPeter Zijlstra goto out2; 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds error = register_filesystem(&hugetlbfs_fs_type); 10111da177e4SLinus Torvalds if (error) 10121da177e4SLinus Torvalds goto out; 10131da177e4SLinus Torvalds 101442d7395fSAndi Kleen i = 0; 101542d7395fSAndi Kleen for_each_hstate(h) { 101642d7395fSAndi Kleen char buf[50]; 101742d7395fSAndi Kleen unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10); 10181da177e4SLinus Torvalds 101942d7395fSAndi Kleen snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb); 102042d7395fSAndi Kleen hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type, 102142d7395fSAndi Kleen buf); 102242d7395fSAndi Kleen 102342d7395fSAndi Kleen if (IS_ERR(hugetlbfs_vfsmount[i])) { 10249b857d26SAndrew Morton pr_err("Cannot mount internal hugetlbfs for " 102542d7395fSAndi Kleen "page size %uK", ps_kb); 102642d7395fSAndi Kleen error = PTR_ERR(hugetlbfs_vfsmount[i]); 102742d7395fSAndi Kleen hugetlbfs_vfsmount[i] = NULL; 10281da177e4SLinus Torvalds } 102942d7395fSAndi Kleen i++; 103042d7395fSAndi Kleen } 103142d7395fSAndi Kleen /* Non default hstates are optional */ 103242d7395fSAndi Kleen if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx])) 103342d7395fSAndi Kleen return 0; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds out: 10361da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 1037e0bf68ddSPeter Zijlstra out2: 10381da177e4SLinus Torvalds return error; 10391da177e4SLinus Torvalds } 10401da177e4SLinus Torvalds 10411da177e4SLinus Torvalds static void __exit exit_hugetlbfs_fs(void) 10421da177e4SLinus Torvalds { 104342d7395fSAndi Kleen struct hstate *h; 104442d7395fSAndi Kleen int i; 104542d7395fSAndi Kleen 104642d7395fSAndi Kleen 10478c0a8537SKirill A. Shutemov /* 10488c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 10498c0a8537SKirill A. Shutemov * destroy cache. 10508c0a8537SKirill A. Shutemov */ 10518c0a8537SKirill A. Shutemov rcu_barrier(); 10521da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 105342d7395fSAndi Kleen i = 0; 105442d7395fSAndi Kleen for_each_hstate(h) 105542d7395fSAndi Kleen kern_unmount(hugetlbfs_vfsmount[i++]); 10561da177e4SLinus Torvalds unregister_filesystem(&hugetlbfs_fs_type); 10571da177e4SLinus Torvalds } 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds module_init(init_hugetlbfs_fs) 10601da177e4SLinus Torvalds module_exit(exit_hugetlbfs_fs) 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1063