11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * hugetlbpage-backed filesystem. Based on ramfs. 31da177e4SLinus Torvalds * 46d49e352SNadia Yvette Chambers * Nadia Yvette Chambers, 2002 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 2002 Linus Torvalds. 73e89e1c5SPaul Gortmaker * License: GPL 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 109b857d26SAndrew Morton #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 119b857d26SAndrew Morton 121da177e4SLinus Torvalds #include <linux/thread_info.h> 131da177e4SLinus Torvalds #include <asm/current.h> 1470c3547eSMike Kravetz #include <linux/falloc.h> 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> 2932021982SDavid Howells #include <linux/fs_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 397c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 4088590253SShijie Hu #include <linux/sched/mm.h> 411da177e4SLinus Torvalds 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 4732021982SDavid Howells enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT }; 4832021982SDavid Howells 4932021982SDavid Howells struct hugetlbfs_fs_context { 504a25220dSDavid Howells struct hstate *hstate; 5132021982SDavid Howells unsigned long long max_size_opt; 5232021982SDavid Howells unsigned long long min_size_opt; 534a25220dSDavid Howells long max_hpages; 544a25220dSDavid Howells long nr_inodes; 554a25220dSDavid Howells long min_hpages; 5632021982SDavid Howells enum hugetlbfs_size_type max_val_type; 5732021982SDavid Howells enum hugetlbfs_size_type min_val_type; 58a0eb3a05SEric W. Biederman kuid_t uid; 59a0eb3a05SEric W. Biederman kgid_t gid; 60a1d776eeSDavid Gibson umode_t mode; 61a1d776eeSDavid Gibson }; 62a1d776eeSDavid Gibson 631da177e4SLinus Torvalds int sysctl_hugetlb_shm_group; 641da177e4SLinus Torvalds 6532021982SDavid Howells enum hugetlb_param { 6632021982SDavid Howells Opt_gid, 6732021982SDavid Howells Opt_min_size, 6832021982SDavid Howells Opt_mode, 6932021982SDavid Howells Opt_nr_inodes, 7032021982SDavid Howells Opt_pagesize, 7132021982SDavid Howells Opt_size, 7232021982SDavid Howells Opt_uid, 73e73a75faSRandy Dunlap }; 74e73a75faSRandy Dunlap 75d7167b14SAl Viro static const struct fs_parameter_spec hugetlb_fs_parameters[] = { 7632021982SDavid Howells fsparam_u32 ("gid", Opt_gid), 7732021982SDavid Howells fsparam_string("min_size", Opt_min_size), 78e0f7e2b2SMike Kravetz fsparam_u32oct("mode", Opt_mode), 7932021982SDavid Howells fsparam_string("nr_inodes", Opt_nr_inodes), 8032021982SDavid Howells fsparam_string("pagesize", Opt_pagesize), 8132021982SDavid Howells fsparam_string("size", Opt_size), 8232021982SDavid Howells fsparam_u32 ("uid", Opt_uid), 8332021982SDavid Howells {} 8432021982SDavid Howells }; 8532021982SDavid Howells 8670c3547eSMike Kravetz #ifdef CONFIG_NUMA 8770c3547eSMike Kravetz static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, 8870c3547eSMike Kravetz struct inode *inode, pgoff_t index) 8970c3547eSMike Kravetz { 9070c3547eSMike Kravetz vma->vm_policy = mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy, 9170c3547eSMike Kravetz index); 9270c3547eSMike Kravetz } 9370c3547eSMike Kravetz 9470c3547eSMike Kravetz static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) 9570c3547eSMike Kravetz { 9670c3547eSMike Kravetz mpol_cond_put(vma->vm_policy); 9770c3547eSMike Kravetz } 9870c3547eSMike Kravetz #else 9970c3547eSMike Kravetz static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, 10070c3547eSMike Kravetz struct inode *inode, pgoff_t index) 10170c3547eSMike Kravetz { 10270c3547eSMike Kravetz } 10370c3547eSMike Kravetz 10470c3547eSMike Kravetz static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) 10570c3547eSMike Kravetz { 10670c3547eSMike Kravetz } 10770c3547eSMike Kravetz #endif 10870c3547eSMike Kravetz 10963489f8eSMike Kravetz /* 11063489f8eSMike Kravetz * Mask used when checking the page offset value passed in via system 11163489f8eSMike Kravetz * calls. This value will be converted to a loff_t which is signed. 11263489f8eSMike Kravetz * Therefore, we want to check the upper PAGE_SHIFT + 1 bits of the 11363489f8eSMike Kravetz * value. The extra bit (- 1 in the shift value) is to take the sign 11463489f8eSMike Kravetz * bit into account. 11563489f8eSMike Kravetz */ 11663489f8eSMike Kravetz #define PGOFF_LOFFT_MAX \ 11763489f8eSMike Kravetz (((1UL << (PAGE_SHIFT + 1)) - 1) << (BITS_PER_LONG - (PAGE_SHIFT + 1))) 11863489f8eSMike Kravetz 1191da177e4SLinus Torvalds static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) 1201da177e4SLinus Torvalds { 121496ad9aaSAl Viro struct inode *inode = file_inode(file); 12222247efdSPeter Xu struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); 1231da177e4SLinus Torvalds loff_t len, vma_len; 1241da177e4SLinus Torvalds int ret; 125a5516438SAndi Kleen struct hstate *h = hstate_file(file); 1261da177e4SLinus Torvalds 12768589bc3SHugh Dickins /* 128dec4ad86SDavid Gibson * vma address alignment (but not the pgoff alignment) has 129dec4ad86SDavid Gibson * already been checked by prepare_hugepage_range. If you add 130dec4ad86SDavid Gibson * any error returns here, do so after setting VM_HUGETLB, so 131dec4ad86SDavid Gibson * is_vm_hugetlb_page tests below unmap_region go the right 13245e55300SPeter Collingbourne * way when do_mmap unwinds (may be important on powerpc 133dec4ad86SDavid Gibson * and ia64). 13468589bc3SHugh Dickins */ 135a2fce914SNaoya Horiguchi vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; 13668589bc3SHugh Dickins vma->vm_ops = &hugetlb_vm_ops; 1371da177e4SLinus Torvalds 13822247efdSPeter Xu ret = seal_check_future_write(info->seals, vma); 13922247efdSPeter Xu if (ret) 14022247efdSPeter Xu return ret; 14122247efdSPeter Xu 142045c7a3fSMike Kravetz /* 14363489f8eSMike Kravetz * page based offset in vm_pgoff could be sufficiently large to 1445df63c2aSMike Kravetz * overflow a loff_t when converted to byte offset. This can 1455df63c2aSMike Kravetz * only happen on architectures where sizeof(loff_t) == 1465df63c2aSMike Kravetz * sizeof(unsigned long). So, only check in those instances. 147045c7a3fSMike Kravetz */ 1485df63c2aSMike Kravetz if (sizeof(unsigned long) == sizeof(loff_t)) { 14963489f8eSMike Kravetz if (vma->vm_pgoff & PGOFF_LOFFT_MAX) 150045c7a3fSMike Kravetz return -EINVAL; 1515df63c2aSMike Kravetz } 152045c7a3fSMike Kravetz 15363489f8eSMike Kravetz /* must be huge page aligned */ 1542b37c35eSBecky Bruce if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) 155dec4ad86SDavid Gibson return -EINVAL; 156dec4ad86SDavid Gibson 1571da177e4SLinus Torvalds vma_len = (loff_t)(vma->vm_end - vma->vm_start); 158045c7a3fSMike Kravetz len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); 159045c7a3fSMike Kravetz /* check for overflow */ 160045c7a3fSMike Kravetz if (len < vma_len) 161045c7a3fSMike Kravetz return -EINVAL; 1621da177e4SLinus Torvalds 1635955102cSAl Viro inode_lock(inode); 1641da177e4SLinus Torvalds file_accessed(file); 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds ret = -ENOMEM; 16733b8f84aSMike Kravetz if (!hugetlb_reserve_pages(inode, 168a5516438SAndi Kleen vma->vm_pgoff >> huge_page_order(h), 1695a6fe125SMel Gorman len >> huge_page_shift(h), vma, 1705a6fe125SMel Gorman vma->vm_flags)) 171b45b5bd6SDavid Gibson goto out; 172b45b5bd6SDavid Gibson 1734c887265SAdam Litke ret = 0; 174b6174df5SZhang, Yanmin if (vma->vm_flags & VM_WRITE && inode->i_size < len) 175045c7a3fSMike Kravetz i_size_write(inode, len); 1761da177e4SLinus Torvalds out: 1775955102cSAl Viro inode_unlock(inode); 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds return ret; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1833e4e28c5SMichel Lespinasse * Called under mmap_write_lock(mm). 1841da177e4SLinus Torvalds */ 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds static unsigned long 18788590253SShijie Hu hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr, 18888590253SShijie Hu unsigned long len, unsigned long pgoff, unsigned long flags) 18988590253SShijie Hu { 19088590253SShijie Hu struct hstate *h = hstate_file(file); 19188590253SShijie Hu struct vm_unmapped_area_info info; 19288590253SShijie Hu 19388590253SShijie Hu info.flags = 0; 19488590253SShijie Hu info.length = len; 19588590253SShijie Hu info.low_limit = current->mm->mmap_base; 1962cb4de08SChristophe Leroy info.high_limit = arch_get_mmap_end(addr, len, flags); 19788590253SShijie Hu info.align_mask = PAGE_MASK & ~huge_page_mask(h); 19888590253SShijie Hu info.align_offset = 0; 19988590253SShijie Hu return vm_unmapped_area(&info); 20088590253SShijie Hu } 20188590253SShijie Hu 20288590253SShijie Hu static unsigned long 20388590253SShijie Hu hugetlb_get_unmapped_area_topdown(struct file *file, unsigned long addr, 20488590253SShijie Hu unsigned long len, unsigned long pgoff, unsigned long flags) 20588590253SShijie Hu { 20688590253SShijie Hu struct hstate *h = hstate_file(file); 20788590253SShijie Hu struct vm_unmapped_area_info info; 20888590253SShijie Hu 20988590253SShijie Hu info.flags = VM_UNMAPPED_AREA_TOPDOWN; 21088590253SShijie Hu info.length = len; 21188590253SShijie Hu info.low_limit = max(PAGE_SIZE, mmap_min_addr); 2125f24d5a5SChristophe Leroy info.high_limit = arch_get_mmap_base(addr, current->mm->mmap_base); 21388590253SShijie Hu info.align_mask = PAGE_MASK & ~huge_page_mask(h); 21488590253SShijie Hu info.align_offset = 0; 21588590253SShijie Hu addr = vm_unmapped_area(&info); 21688590253SShijie Hu 21788590253SShijie Hu /* 21888590253SShijie Hu * A failed mmap() very likely causes application failure, 21988590253SShijie Hu * so fall back to the bottom-up function here. This scenario 22088590253SShijie Hu * can happen with large stack limits and large mmap() 22188590253SShijie Hu * allocations. 22288590253SShijie Hu */ 22388590253SShijie Hu if (unlikely(offset_in_page(addr))) { 22488590253SShijie Hu VM_BUG_ON(addr != -ENOMEM); 22588590253SShijie Hu info.flags = 0; 22688590253SShijie Hu info.low_limit = current->mm->mmap_base; 2272cb4de08SChristophe Leroy info.high_limit = arch_get_mmap_end(addr, len, flags); 22888590253SShijie Hu addr = vm_unmapped_area(&info); 22988590253SShijie Hu } 23088590253SShijie Hu 23188590253SShijie Hu return addr; 23288590253SShijie Hu } 23388590253SShijie Hu 2344b439e25SChristophe Leroy unsigned long 2354b439e25SChristophe Leroy generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 2364b439e25SChristophe Leroy unsigned long len, unsigned long pgoff, 2374b439e25SChristophe Leroy unsigned long flags) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds struct mm_struct *mm = current->mm; 2401da177e4SLinus Torvalds struct vm_area_struct *vma; 241a5516438SAndi Kleen struct hstate *h = hstate_file(file); 2422cb4de08SChristophe Leroy const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); 2431da177e4SLinus Torvalds 244a5516438SAndi Kleen if (len & ~huge_page_mask(h)) 2451da177e4SLinus Torvalds return -EINVAL; 2461da177e4SLinus Torvalds if (len > TASK_SIZE) 2471da177e4SLinus Torvalds return -ENOMEM; 2481da177e4SLinus Torvalds 249036e0856SBenjamin Herrenschmidt if (flags & MAP_FIXED) { 250a5516438SAndi Kleen if (prepare_hugepage_range(file, addr, len)) 251036e0856SBenjamin Herrenschmidt return -EINVAL; 252036e0856SBenjamin Herrenschmidt return addr; 253036e0856SBenjamin Herrenschmidt } 254036e0856SBenjamin Herrenschmidt 2551da177e4SLinus Torvalds if (addr) { 256a5516438SAndi Kleen addr = ALIGN(addr, huge_page_size(h)); 2571da177e4SLinus Torvalds vma = find_vma(mm, addr); 2585f24d5a5SChristophe Leroy if (mmap_end - len >= addr && 2591be7107fSHugh Dickins (!vma || addr + len <= vm_start_gap(vma))) 2601da177e4SLinus Torvalds return addr; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 26388590253SShijie Hu /* 26488590253SShijie Hu * Use mm->get_unmapped_area value as a hint to use topdown routine. 26588590253SShijie Hu * If architectures have special needs, they should define their own 26688590253SShijie Hu * version of hugetlb_get_unmapped_area. 26788590253SShijie Hu */ 26888590253SShijie Hu if (mm->get_unmapped_area == arch_get_unmapped_area_topdown) 26988590253SShijie Hu return hugetlb_get_unmapped_area_topdown(file, addr, len, 27088590253SShijie Hu pgoff, flags); 27188590253SShijie Hu return hugetlb_get_unmapped_area_bottomup(file, addr, len, 27288590253SShijie Hu pgoff, flags); 2731da177e4SLinus Torvalds } 2744b439e25SChristophe Leroy 2754b439e25SChristophe Leroy #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 2764b439e25SChristophe Leroy static unsigned long 2774b439e25SChristophe Leroy hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 2784b439e25SChristophe Leroy unsigned long len, unsigned long pgoff, 2794b439e25SChristophe Leroy unsigned long flags) 2804b439e25SChristophe Leroy { 2814b439e25SChristophe Leroy return generic_hugetlb_get_unmapped_area(file, addr, len, pgoff, flags); 2824b439e25SChristophe Leroy } 2831da177e4SLinus Torvalds #endif 2841da177e4SLinus Torvalds 285e63e1e5aSBadari Pulavarty /* 286e63e1e5aSBadari Pulavarty * Support for read() - Find the page attached to f_mapping and copy out the 287445c8098SMiaohe Lin * data. This provides functionality similar to filemap_read(). 288e63e1e5aSBadari Pulavarty */ 28934d0640eSAl Viro static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) 290e63e1e5aSBadari Pulavarty { 29134d0640eSAl Viro struct file *file = iocb->ki_filp; 29234d0640eSAl Viro struct hstate *h = hstate_file(file); 29334d0640eSAl Viro struct address_space *mapping = file->f_mapping; 294e63e1e5aSBadari Pulavarty struct inode *inode = mapping->host; 29534d0640eSAl Viro unsigned long index = iocb->ki_pos >> huge_page_shift(h); 29634d0640eSAl Viro unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); 297e63e1e5aSBadari Pulavarty unsigned long end_index; 298e63e1e5aSBadari Pulavarty loff_t isize; 299e63e1e5aSBadari Pulavarty ssize_t retval = 0; 300e63e1e5aSBadari Pulavarty 30134d0640eSAl Viro while (iov_iter_count(to)) { 302e63e1e5aSBadari Pulavarty struct page *page; 30334d0640eSAl Viro size_t nr, copied; 304e63e1e5aSBadari Pulavarty 305e63e1e5aSBadari Pulavarty /* nr is the maximum number of bytes to copy from this page */ 306a5516438SAndi Kleen nr = huge_page_size(h); 307a05b0855SAneesh Kumar K.V isize = i_size_read(inode); 308a05b0855SAneesh Kumar K.V if (!isize) 30934d0640eSAl Viro break; 310a05b0855SAneesh Kumar K.V end_index = (isize - 1) >> huge_page_shift(h); 311e63e1e5aSBadari Pulavarty if (index > end_index) 31234d0640eSAl Viro break; 31334d0640eSAl Viro if (index == end_index) { 314a5516438SAndi Kleen nr = ((isize - 1) & ~huge_page_mask(h)) + 1; 315a05b0855SAneesh Kumar K.V if (nr <= offset) 31634d0640eSAl Viro break; 317e63e1e5aSBadari Pulavarty } 318e63e1e5aSBadari Pulavarty nr = nr - offset; 319e63e1e5aSBadari Pulavarty 320e63e1e5aSBadari Pulavarty /* Find the page */ 321a05b0855SAneesh Kumar K.V page = find_lock_page(mapping, index); 322e63e1e5aSBadari Pulavarty if (unlikely(page == NULL)) { 323e63e1e5aSBadari Pulavarty /* 324e63e1e5aSBadari Pulavarty * We have a HOLE, zero out the user-buffer for the 325e63e1e5aSBadari Pulavarty * length of the hole or request. 326e63e1e5aSBadari Pulavarty */ 32734d0640eSAl Viro copied = iov_iter_zero(nr, to); 328e63e1e5aSBadari Pulavarty } else { 329a05b0855SAneesh Kumar K.V unlock_page(page); 330a05b0855SAneesh Kumar K.V 331e63e1e5aSBadari Pulavarty /* 332e63e1e5aSBadari Pulavarty * We have the page, copy it to user space buffer. 333e63e1e5aSBadari Pulavarty */ 334c7d57ab1SAl Viro copied = copy_page_to_iter(page, offset, nr, to); 33509cbfeafSKirill A. Shutemov put_page(page); 336e63e1e5aSBadari Pulavarty } 33734d0640eSAl Viro offset += copied; 33834d0640eSAl Viro retval += copied; 33934d0640eSAl Viro if (copied != nr && iov_iter_count(to)) { 34034d0640eSAl Viro if (!retval) 34134d0640eSAl Viro retval = -EFAULT; 342e63e1e5aSBadari Pulavarty break; 343e63e1e5aSBadari Pulavarty } 34434d0640eSAl Viro index += offset >> huge_page_shift(h); 34534d0640eSAl Viro offset &= ~huge_page_mask(h); 34634d0640eSAl Viro } 34734d0640eSAl Viro iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; 348e63e1e5aSBadari Pulavarty return retval; 349e63e1e5aSBadari Pulavarty } 350e63e1e5aSBadari Pulavarty 351800d15a5SNick Piggin static int hugetlbfs_write_begin(struct file *file, 352800d15a5SNick Piggin struct address_space *mapping, 3539d6b0cd7SMatthew Wilcox (Oracle) loff_t pos, unsigned len, 354800d15a5SNick Piggin struct page **pagep, void **fsdata) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds return -EINVAL; 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds 359800d15a5SNick Piggin static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, 360800d15a5SNick Piggin loff_t pos, unsigned len, unsigned copied, 361800d15a5SNick Piggin struct page *page, void *fsdata) 3621da177e4SLinus Torvalds { 363800d15a5SNick Piggin BUG(); 3641da177e4SLinus Torvalds return -EINVAL; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds 3677e1813d4SMike Kravetz static void hugetlb_delete_from_page_cache(struct page *page) 3681da177e4SLinus Torvalds { 369b9ea2515SKonstantin Khlebnikov ClearPageDirty(page); 3701da177e4SLinus Torvalds ClearPageUptodate(page); 371bd65cb86SMinchan Kim delete_from_page_cache(page); 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 374378397ccSMike Kravetz /* 375378397ccSMike Kravetz * Called with i_mmap_rwsem held for inode based vma maps. This makes 376378397ccSMike Kravetz * sure vma (and vm_mm) will not go away. We also hold the hugetlb fault 377378397ccSMike Kravetz * mutex for the page in the mapping. So, we can not race with page being 378378397ccSMike Kravetz * faulted into the vma. 379378397ccSMike Kravetz */ 380378397ccSMike Kravetz static bool hugetlb_vma_maps_page(struct vm_area_struct *vma, 381378397ccSMike Kravetz unsigned long addr, struct page *page) 382378397ccSMike Kravetz { 383378397ccSMike Kravetz pte_t *ptep, pte; 384378397ccSMike Kravetz 385378397ccSMike Kravetz ptep = huge_pte_offset(vma->vm_mm, addr, 386378397ccSMike Kravetz huge_page_size(hstate_vma(vma))); 387378397ccSMike Kravetz 388378397ccSMike Kravetz if (!ptep) 389378397ccSMike Kravetz return false; 390378397ccSMike Kravetz 391378397ccSMike Kravetz pte = huge_ptep_get(ptep); 392378397ccSMike Kravetz if (huge_pte_none(pte) || !pte_present(pte)) 393378397ccSMike Kravetz return false; 394378397ccSMike Kravetz 395378397ccSMike Kravetz if (pte_page(pte) == page) 396378397ccSMike Kravetz return true; 397378397ccSMike Kravetz 398378397ccSMike Kravetz return false; 399378397ccSMike Kravetz } 400378397ccSMike Kravetz 401378397ccSMike Kravetz /* 402378397ccSMike Kravetz * Can vma_offset_start/vma_offset_end overflow on 32-bit arches? 403378397ccSMike Kravetz * No, because the interval tree returns us only those vmas 404378397ccSMike Kravetz * which overlap the truncated area starting at pgoff, 405378397ccSMike Kravetz * and no vma on a 32-bit arch can span beyond the 4GB. 406378397ccSMike Kravetz */ 407378397ccSMike Kravetz static unsigned long vma_offset_start(struct vm_area_struct *vma, pgoff_t start) 408378397ccSMike Kravetz { 409378397ccSMike Kravetz if (vma->vm_pgoff < start) 410378397ccSMike Kravetz return (start - vma->vm_pgoff) << PAGE_SHIFT; 411378397ccSMike Kravetz else 412378397ccSMike Kravetz return 0; 413378397ccSMike Kravetz } 414378397ccSMike Kravetz 415378397ccSMike Kravetz static unsigned long vma_offset_end(struct vm_area_struct *vma, pgoff_t end) 416378397ccSMike Kravetz { 417378397ccSMike Kravetz unsigned long t_end; 418378397ccSMike Kravetz 419378397ccSMike Kravetz if (!end) 420378397ccSMike Kravetz return vma->vm_end; 421378397ccSMike Kravetz 422378397ccSMike Kravetz t_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) + vma->vm_start; 423378397ccSMike Kravetz if (t_end > vma->vm_end) 424378397ccSMike Kravetz t_end = vma->vm_end; 425378397ccSMike Kravetz return t_end; 426378397ccSMike Kravetz } 427378397ccSMike Kravetz 428378397ccSMike Kravetz /* 429378397ccSMike Kravetz * Called with hugetlb fault mutex held. Therefore, no more mappings to 430378397ccSMike Kravetz * this folio can be created while executing the routine. 431378397ccSMike Kravetz */ 432378397ccSMike Kravetz static void hugetlb_unmap_file_folio(struct hstate *h, 433378397ccSMike Kravetz struct address_space *mapping, 434378397ccSMike Kravetz struct folio *folio, pgoff_t index) 435378397ccSMike Kravetz { 436378397ccSMike Kravetz struct rb_root_cached *root = &mapping->i_mmap; 43740549ba8SMike Kravetz struct hugetlb_vma_lock *vma_lock; 438378397ccSMike Kravetz struct page *page = &folio->page; 439378397ccSMike Kravetz struct vm_area_struct *vma; 440378397ccSMike Kravetz unsigned long v_start; 441378397ccSMike Kravetz unsigned long v_end; 442378397ccSMike Kravetz pgoff_t start, end; 443378397ccSMike Kravetz 444378397ccSMike Kravetz start = index * pages_per_huge_page(h); 445378397ccSMike Kravetz end = (index + 1) * pages_per_huge_page(h); 446378397ccSMike Kravetz 447378397ccSMike Kravetz i_mmap_lock_write(mapping); 44840549ba8SMike Kravetz retry: 44940549ba8SMike Kravetz vma_lock = NULL; 450378397ccSMike Kravetz vma_interval_tree_foreach(vma, root, start, end - 1) { 451378397ccSMike Kravetz v_start = vma_offset_start(vma, start); 452378397ccSMike Kravetz v_end = vma_offset_end(vma, end); 453378397ccSMike Kravetz 454378397ccSMike Kravetz if (!hugetlb_vma_maps_page(vma, vma->vm_start + v_start, page)) 455378397ccSMike Kravetz continue; 456378397ccSMike Kravetz 45740549ba8SMike Kravetz if (!hugetlb_vma_trylock_write(vma)) { 45840549ba8SMike Kravetz vma_lock = vma->vm_private_data; 45940549ba8SMike Kravetz /* 46040549ba8SMike Kravetz * If we can not get vma lock, we need to drop 46140549ba8SMike Kravetz * immap_sema and take locks in order. First, 46240549ba8SMike Kravetz * take a ref on the vma_lock structure so that 46340549ba8SMike Kravetz * we can be guaranteed it will not go away when 46440549ba8SMike Kravetz * dropping immap_sema. 46540549ba8SMike Kravetz */ 46640549ba8SMike Kravetz kref_get(&vma_lock->refs); 46740549ba8SMike Kravetz break; 46840549ba8SMike Kravetz } 46940549ba8SMike Kravetz 470378397ccSMike Kravetz unmap_hugepage_range(vma, vma->vm_start + v_start, v_end, 471378397ccSMike Kravetz NULL, ZAP_FLAG_DROP_MARKER); 47240549ba8SMike Kravetz hugetlb_vma_unlock_write(vma); 473378397ccSMike Kravetz } 474378397ccSMike Kravetz 475378397ccSMike Kravetz i_mmap_unlock_write(mapping); 47640549ba8SMike Kravetz 47740549ba8SMike Kravetz if (vma_lock) { 47840549ba8SMike Kravetz /* 47940549ba8SMike Kravetz * Wait on vma_lock. We know it is still valid as we have 48040549ba8SMike Kravetz * a reference. We must 'open code' vma locking as we do 48140549ba8SMike Kravetz * not know if vma_lock is still attached to vma. 48240549ba8SMike Kravetz */ 48340549ba8SMike Kravetz down_write(&vma_lock->rw_sema); 48440549ba8SMike Kravetz i_mmap_lock_write(mapping); 48540549ba8SMike Kravetz 48640549ba8SMike Kravetz vma = vma_lock->vma; 48740549ba8SMike Kravetz if (!vma) { 48840549ba8SMike Kravetz /* 48940549ba8SMike Kravetz * If lock is no longer attached to vma, then just 49040549ba8SMike Kravetz * unlock, drop our reference and retry looking for 49140549ba8SMike Kravetz * other vmas. 49240549ba8SMike Kravetz */ 49340549ba8SMike Kravetz up_write(&vma_lock->rw_sema); 49440549ba8SMike Kravetz kref_put(&vma_lock->refs, hugetlb_vma_lock_release); 49540549ba8SMike Kravetz goto retry; 49640549ba8SMike Kravetz } 49740549ba8SMike Kravetz 49840549ba8SMike Kravetz /* 49940549ba8SMike Kravetz * vma_lock is still attached to vma. Check to see if vma 50040549ba8SMike Kravetz * still maps page and if so, unmap. 50140549ba8SMike Kravetz */ 50240549ba8SMike Kravetz v_start = vma_offset_start(vma, start); 50340549ba8SMike Kravetz v_end = vma_offset_end(vma, end); 50440549ba8SMike Kravetz if (hugetlb_vma_maps_page(vma, vma->vm_start + v_start, page)) 50540549ba8SMike Kravetz unmap_hugepage_range(vma, vma->vm_start + v_start, 50640549ba8SMike Kravetz v_end, NULL, 50740549ba8SMike Kravetz ZAP_FLAG_DROP_MARKER); 50840549ba8SMike Kravetz 50940549ba8SMike Kravetz kref_put(&vma_lock->refs, hugetlb_vma_lock_release); 51040549ba8SMike Kravetz hugetlb_vma_unlock_write(vma); 51140549ba8SMike Kravetz 51240549ba8SMike Kravetz goto retry; 51340549ba8SMike Kravetz } 514378397ccSMike Kravetz } 515378397ccSMike Kravetz 5164aae8d1cSMike Kravetz static void 51705e90bd0SPeter Xu hugetlb_vmdelete_list(struct rb_root_cached *root, pgoff_t start, pgoff_t end, 51805e90bd0SPeter Xu zap_flags_t zap_flags) 5194aae8d1cSMike Kravetz { 5204aae8d1cSMike Kravetz struct vm_area_struct *vma; 5214aae8d1cSMike Kravetz 5224aae8d1cSMike Kravetz /* 523d6aba4c8SSean Christopherson * end == 0 indicates that the entire range after start should be 524d6aba4c8SSean Christopherson * unmapped. Note, end is exclusive, whereas the interval tree takes 525d6aba4c8SSean Christopherson * an inclusive "last". 5264aae8d1cSMike Kravetz */ 527d6aba4c8SSean Christopherson vma_interval_tree_foreach(vma, root, start, end ? end - 1 : ULONG_MAX) { 528378397ccSMike Kravetz unsigned long v_start; 5294aae8d1cSMike Kravetz unsigned long v_end; 5304aae8d1cSMike Kravetz 53140549ba8SMike Kravetz if (!hugetlb_vma_trylock_write(vma)) 53240549ba8SMike Kravetz continue; 53340549ba8SMike Kravetz 534378397ccSMike Kravetz v_start = vma_offset_start(vma, start); 535378397ccSMike Kravetz v_end = vma_offset_end(vma, end); 5364aae8d1cSMike Kravetz 537378397ccSMike Kravetz unmap_hugepage_range(vma, vma->vm_start + v_start, v_end, 53805e90bd0SPeter Xu NULL, zap_flags); 53940549ba8SMike Kravetz 54040549ba8SMike Kravetz /* 54140549ba8SMike Kravetz * Note that vma lock only exists for shared/non-private 54240549ba8SMike Kravetz * vmas. Therefore, lock is not held when calling 54340549ba8SMike Kravetz * unmap_hugepage_range for private vmas. 54440549ba8SMike Kravetz */ 54540549ba8SMike Kravetz hugetlb_vma_unlock_write(vma); 5464aae8d1cSMike Kravetz } 5474aae8d1cSMike Kravetz } 548b5cec28dSMike Kravetz 549b5cec28dSMike Kravetz /* 550c8627228SMike Kravetz * Called with hugetlb fault mutex held. 551c8627228SMike Kravetz * Returns true if page was actually removed, false otherwise. 552c8627228SMike Kravetz */ 553c8627228SMike Kravetz static bool remove_inode_single_folio(struct hstate *h, struct inode *inode, 554c8627228SMike Kravetz struct address_space *mapping, 555c8627228SMike Kravetz struct folio *folio, pgoff_t index, 556c8627228SMike Kravetz bool truncate_op) 557c8627228SMike Kravetz { 558c8627228SMike Kravetz bool ret = false; 559c8627228SMike Kravetz 560c8627228SMike Kravetz /* 561c8627228SMike Kravetz * If folio is mapped, it was faulted in after being 562c8627228SMike Kravetz * unmapped in caller. Unmap (again) while holding 563c8627228SMike Kravetz * the fault mutex. The mutex will prevent faults 564c8627228SMike Kravetz * until we finish removing the folio. 565c8627228SMike Kravetz */ 566378397ccSMike Kravetz if (unlikely(folio_mapped(folio))) 567378397ccSMike Kravetz hugetlb_unmap_file_folio(h, mapping, folio, index); 568c8627228SMike Kravetz 569c8627228SMike Kravetz folio_lock(folio); 570c8627228SMike Kravetz /* 571c8627228SMike Kravetz * We must remove the folio from page cache before removing 572c8627228SMike Kravetz * the region/ reserve map (hugetlb_unreserve_pages). In 573c8627228SMike Kravetz * rare out of memory conditions, removal of the region/reserve 574c8627228SMike Kravetz * map could fail. Correspondingly, the subpool and global 575c8627228SMike Kravetz * reserve usage count can need to be adjusted. 576c8627228SMike Kravetz */ 577c8627228SMike Kravetz VM_BUG_ON(HPageRestoreReserve(&folio->page)); 578c8627228SMike Kravetz hugetlb_delete_from_page_cache(&folio->page); 579c8627228SMike Kravetz ret = true; 580c8627228SMike Kravetz if (!truncate_op) { 581c8627228SMike Kravetz if (unlikely(hugetlb_unreserve_pages(inode, index, 582c8627228SMike Kravetz index + 1, 1))) 583c8627228SMike Kravetz hugetlb_fix_reserve_counts(inode); 584c8627228SMike Kravetz } 585c8627228SMike Kravetz 586c8627228SMike Kravetz folio_unlock(folio); 587c8627228SMike Kravetz return ret; 588c8627228SMike Kravetz } 589c8627228SMike Kravetz 590c8627228SMike Kravetz /* 591b5cec28dSMike Kravetz * remove_inode_hugepages handles two distinct cases: truncation and hole 592b5cec28dSMike Kravetz * punch. There are subtle differences in operation for each case. 5934aae8d1cSMike Kravetz * 594b5cec28dSMike Kravetz * truncation is indicated by end of range being LLONG_MAX 595b5cec28dSMike Kravetz * In this case, we first scan the range and release found pages. 5961935ebd3SMiaohe Lin * After releasing pages, hugetlb_unreserve_pages cleans up region/reserve 597c8627228SMike Kravetz * maps and global counts. Page faults can race with truncation. 598c8627228SMike Kravetz * During faults, hugetlb_no_page() checks i_size before page allocation, 599c8627228SMike Kravetz * and again after obtaining page table lock. It will 'back out' 600c8627228SMike Kravetz * allocations in the truncated range. 601b5cec28dSMike Kravetz * hole punch is indicated if end is not LLONG_MAX 602b5cec28dSMike Kravetz * In the hole punch case we scan the range and release found pages. 6031935ebd3SMiaohe Lin * Only when releasing a page is the associated region/reserve map 6041935ebd3SMiaohe Lin * deleted. The region/reserve map for ranges without associated 605e7c58097SMike Kravetz * pages are not modified. Page faults can race with hole punch. 606e7c58097SMike Kravetz * This is indicated if we find a mapped page. 607b5cec28dSMike Kravetz * Note: If the passed end of range value is beyond the end of file, but 608b5cec28dSMike Kravetz * not LLONG_MAX this routine still performs a hole punch operation. 609b5cec28dSMike Kravetz */ 610b5cec28dSMike Kravetz static void remove_inode_hugepages(struct inode *inode, loff_t lstart, 611b5cec28dSMike Kravetz loff_t lend) 6121da177e4SLinus Torvalds { 613a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 614b45b5bd6SDavid Gibson struct address_space *mapping = &inode->i_data; 615a5516438SAndi Kleen const pgoff_t start = lstart >> huge_page_shift(h); 616b5cec28dSMike Kravetz const pgoff_t end = lend >> huge_page_shift(h); 6171508062eSMatthew Wilcox (Oracle) struct folio_batch fbatch; 618d72dc8a2SJan Kara pgoff_t next, index; 619a43a8c39SChen, Kenneth W int i, freed = 0; 620b5cec28dSMike Kravetz bool truncate_op = (lend == LLONG_MAX); 6211da177e4SLinus Torvalds 6221508062eSMatthew Wilcox (Oracle) folio_batch_init(&fbatch); 6231da177e4SLinus Torvalds next = start; 6241508062eSMatthew Wilcox (Oracle) while (filemap_get_folios(mapping, &next, end - 1, &fbatch)) { 6251508062eSMatthew Wilcox (Oracle) for (i = 0; i < folio_batch_count(&fbatch); ++i) { 6261508062eSMatthew Wilcox (Oracle) struct folio *folio = fbatch.folios[i]; 627d4241a04SMiaohe Lin u32 hash = 0; 628b5cec28dSMike Kravetz 6291508062eSMatthew Wilcox (Oracle) index = folio->index; 630d4241a04SMiaohe Lin hash = hugetlb_fault_mutex_hash(mapping, index); 631e7c58097SMike Kravetz mutex_lock(&hugetlb_fault_mutex_table[hash]); 632e7c58097SMike Kravetz 633b5cec28dSMike Kravetz /* 634c8627228SMike Kravetz * Remove folio that was part of folio_batch. 635b5cec28dSMike Kravetz */ 636c8627228SMike Kravetz if (remove_inode_single_folio(h, inode, mapping, folio, 637c8627228SMike Kravetz index, truncate_op)) 638b5cec28dSMike Kravetz freed++; 639b5cec28dSMike Kravetz 640e7c58097SMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 6411da177e4SLinus Torvalds } 6421508062eSMatthew Wilcox (Oracle) folio_batch_release(&fbatch); 6431817889eSMike Kravetz cond_resched(); 6441da177e4SLinus Torvalds } 645b5cec28dSMike Kravetz 646b5cec28dSMike Kravetz if (truncate_op) 647b5cec28dSMike Kravetz (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6502bbbda30SAl Viro static void hugetlbfs_evict_inode(struct inode *inode) 6511da177e4SLinus Torvalds { 6529119a41eSJoonsoo Kim struct resv_map *resv_map; 6539119a41eSJoonsoo Kim 654b5cec28dSMike Kravetz remove_inode_hugepages(inode, 0, LLONG_MAX); 655f27a5136SMike Kravetz 656f27a5136SMike Kravetz /* 657f27a5136SMike Kravetz * Get the resv_map from the address space embedded in the inode. 658f27a5136SMike Kravetz * This is the address space which points to any resv_map allocated 659f27a5136SMike Kravetz * at inode creation time. If this is a device special inode, 660f27a5136SMike Kravetz * i_mapping may not point to the original address space. 661f27a5136SMike Kravetz */ 662f27a5136SMike Kravetz resv_map = (struct resv_map *)(&inode->i_data)->private_data; 663f27a5136SMike Kravetz /* Only regular and link inodes have associated reserve maps */ 6649119a41eSJoonsoo Kim if (resv_map) 6659119a41eSJoonsoo Kim resv_map_release(&resv_map->refs); 666dbd5768fSJan Kara clear_inode(inode); 667149f4211SChristoph Hellwig } 668149f4211SChristoph Hellwig 669e5d319deSMiaohe Lin static void hugetlb_vmtruncate(struct inode *inode, loff_t offset) 6701da177e4SLinus Torvalds { 671856fc295SHugh Dickins pgoff_t pgoff; 6721da177e4SLinus Torvalds struct address_space *mapping = inode->i_mapping; 673a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 6741da177e4SLinus Torvalds 675a5516438SAndi Kleen BUG_ON(offset & ~huge_page_mask(h)); 676856fc295SHugh Dickins pgoff = offset >> PAGE_SHIFT; 6771da177e4SLinus Torvalds 67887bf91d3SMike Kravetz i_size_write(inode, offset); 679188a3972SMike Kravetz i_mmap_lock_write(mapping); 680f808c13fSDavidlohr Bueso if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) 68105e90bd0SPeter Xu hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0, 68205e90bd0SPeter Xu ZAP_FLAG_DROP_MARKER); 683c86aa7bbSMike Kravetz i_mmap_unlock_write(mapping); 684e7c58097SMike Kravetz remove_inode_hugepages(inode, offset, LLONG_MAX); 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 68768d32527SMike Kravetz static void hugetlbfs_zero_partial_page(struct hstate *h, 68868d32527SMike Kravetz struct address_space *mapping, 68968d32527SMike Kravetz loff_t start, 69068d32527SMike Kravetz loff_t end) 69168d32527SMike Kravetz { 69268d32527SMike Kravetz pgoff_t idx = start >> huge_page_shift(h); 69368d32527SMike Kravetz struct folio *folio; 69468d32527SMike Kravetz 69568d32527SMike Kravetz folio = filemap_lock_folio(mapping, idx); 69668d32527SMike Kravetz if (!folio) 69768d32527SMike Kravetz return; 69868d32527SMike Kravetz 69968d32527SMike Kravetz start = start & ~huge_page_mask(h); 70068d32527SMike Kravetz end = end & ~huge_page_mask(h); 70168d32527SMike Kravetz if (!end) 70268d32527SMike Kravetz end = huge_page_size(h); 70368d32527SMike Kravetz 70468d32527SMike Kravetz folio_zero_segment(folio, (size_t)start, (size_t)end); 70568d32527SMike Kravetz 70668d32527SMike Kravetz folio_unlock(folio); 70768d32527SMike Kravetz folio_put(folio); 70868d32527SMike Kravetz } 70968d32527SMike Kravetz 71070c3547eSMike Kravetz static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) 71170c3547eSMike Kravetz { 71268d32527SMike Kravetz struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); 71368d32527SMike Kravetz struct address_space *mapping = inode->i_mapping; 71470c3547eSMike Kravetz struct hstate *h = hstate_inode(inode); 71570c3547eSMike Kravetz loff_t hpage_size = huge_page_size(h); 71670c3547eSMike Kravetz loff_t hole_start, hole_end; 71770c3547eSMike Kravetz 71870c3547eSMike Kravetz /* 71968d32527SMike Kravetz * hole_start and hole_end indicate the full pages within the hole. 72070c3547eSMike Kravetz */ 72170c3547eSMike Kravetz hole_start = round_up(offset, hpage_size); 72270c3547eSMike Kravetz hole_end = round_down(offset + len, hpage_size); 72370c3547eSMike Kravetz 7245955102cSAl Viro inode_lock(inode); 725ff62a342SMarc-André Lureau 726398c0da7SMiaohe Lin /* protected by i_rwsem */ 727ab3948f5SJoel Fernandes (Google) if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) { 728ff62a342SMarc-André Lureau inode_unlock(inode); 729ff62a342SMarc-André Lureau return -EPERM; 730ff62a342SMarc-André Lureau } 731ff62a342SMarc-André Lureau 73270c3547eSMike Kravetz i_mmap_lock_write(mapping); 73368d32527SMike Kravetz 73468d32527SMike Kravetz /* If range starts before first full page, zero partial page. */ 73568d32527SMike Kravetz if (offset < hole_start) 73668d32527SMike Kravetz hugetlbfs_zero_partial_page(h, mapping, 73768d32527SMike Kravetz offset, min(offset + len, hole_start)); 73868d32527SMike Kravetz 73968d32527SMike Kravetz /* Unmap users of full pages in the hole. */ 74068d32527SMike Kravetz if (hole_end > hole_start) { 741f808c13fSDavidlohr Bueso if (!RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) 74270c3547eSMike Kravetz hugetlb_vmdelete_list(&mapping->i_mmap, 74370c3547eSMike Kravetz hole_start >> PAGE_SHIFT, 74405e90bd0SPeter Xu hole_end >> PAGE_SHIFT, 0); 74570c3547eSMike Kravetz } 74670c3547eSMike Kravetz 74768d32527SMike Kravetz /* If range extends beyond last full page, zero partial page. */ 74868d32527SMike Kravetz if ((offset + len) > hole_end && (offset + len) > hole_start) 74968d32527SMike Kravetz hugetlbfs_zero_partial_page(h, mapping, 75068d32527SMike Kravetz hole_end, offset + len); 75168d32527SMike Kravetz 75268d32527SMike Kravetz i_mmap_unlock_write(mapping); 75368d32527SMike Kravetz 75468d32527SMike Kravetz /* Remove full pages from the file. */ 75568d32527SMike Kravetz if (hole_end > hole_start) 75668d32527SMike Kravetz remove_inode_hugepages(inode, hole_start, hole_end); 75768d32527SMike Kravetz 75868d32527SMike Kravetz inode_unlock(inode); 75968d32527SMike Kravetz 76070c3547eSMike Kravetz return 0; 76170c3547eSMike Kravetz } 76270c3547eSMike Kravetz 76370c3547eSMike Kravetz static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, 76470c3547eSMike Kravetz loff_t len) 76570c3547eSMike Kravetz { 76670c3547eSMike Kravetz struct inode *inode = file_inode(file); 767ff62a342SMarc-André Lureau struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); 76870c3547eSMike Kravetz struct address_space *mapping = inode->i_mapping; 76970c3547eSMike Kravetz struct hstate *h = hstate_inode(inode); 77070c3547eSMike Kravetz struct vm_area_struct pseudo_vma; 77170c3547eSMike Kravetz struct mm_struct *mm = current->mm; 77270c3547eSMike Kravetz loff_t hpage_size = huge_page_size(h); 77370c3547eSMike Kravetz unsigned long hpage_shift = huge_page_shift(h); 77470c3547eSMike Kravetz pgoff_t start, index, end; 77570c3547eSMike Kravetz int error; 77670c3547eSMike Kravetz u32 hash; 77770c3547eSMike Kravetz 77870c3547eSMike Kravetz if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 77970c3547eSMike Kravetz return -EOPNOTSUPP; 78070c3547eSMike Kravetz 78170c3547eSMike Kravetz if (mode & FALLOC_FL_PUNCH_HOLE) 78270c3547eSMike Kravetz return hugetlbfs_punch_hole(inode, offset, len); 78370c3547eSMike Kravetz 78470c3547eSMike Kravetz /* 78570c3547eSMike Kravetz * Default preallocate case. 78670c3547eSMike Kravetz * For this range, start is rounded down and end is rounded up 78770c3547eSMike Kravetz * as well as being converted to page offsets. 78870c3547eSMike Kravetz */ 78970c3547eSMike Kravetz start = offset >> hpage_shift; 79070c3547eSMike Kravetz end = (offset + len + hpage_size - 1) >> hpage_shift; 79170c3547eSMike Kravetz 7925955102cSAl Viro inode_lock(inode); 79370c3547eSMike Kravetz 79470c3547eSMike Kravetz /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ 79570c3547eSMike Kravetz error = inode_newsize_ok(inode, offset + len); 79670c3547eSMike Kravetz if (error) 79770c3547eSMike Kravetz goto out; 79870c3547eSMike Kravetz 799ff62a342SMarc-André Lureau if ((info->seals & F_SEAL_GROW) && offset + len > inode->i_size) { 800ff62a342SMarc-André Lureau error = -EPERM; 801ff62a342SMarc-André Lureau goto out; 802ff62a342SMarc-André Lureau } 803ff62a342SMarc-André Lureau 80470c3547eSMike Kravetz /* 80570c3547eSMike Kravetz * Initialize a pseudo vma as this is required by the huge page 80670c3547eSMike Kravetz * allocation routines. If NUMA is configured, use page index 80770c3547eSMike Kravetz * as input to create an allocation policy. 80870c3547eSMike Kravetz */ 8092c4541e2SKirill A. Shutemov vma_init(&pseudo_vma, mm); 81070c3547eSMike Kravetz pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); 81170c3547eSMike Kravetz pseudo_vma.vm_file = file; 81270c3547eSMike Kravetz 81370c3547eSMike Kravetz for (index = start; index < end; index++) { 81470c3547eSMike Kravetz /* 81570c3547eSMike Kravetz * This is supposed to be the vaddr where the page is being 81670c3547eSMike Kravetz * faulted in, but we have no vaddr here. 81770c3547eSMike Kravetz */ 81870c3547eSMike Kravetz struct page *page; 81970c3547eSMike Kravetz unsigned long addr; 82070c3547eSMike Kravetz 82170c3547eSMike Kravetz cond_resched(); 82270c3547eSMike Kravetz 82370c3547eSMike Kravetz /* 82470c3547eSMike Kravetz * fallocate(2) manpage permits EINTR; we may have been 82570c3547eSMike Kravetz * interrupted because we are using up too much memory. 82670c3547eSMike Kravetz */ 82770c3547eSMike Kravetz if (signal_pending(current)) { 82870c3547eSMike Kravetz error = -EINTR; 82970c3547eSMike Kravetz break; 83070c3547eSMike Kravetz } 83170c3547eSMike Kravetz 83270c3547eSMike Kravetz /* Set numa allocation policy based on index */ 83370c3547eSMike Kravetz hugetlb_set_vma_policy(&pseudo_vma, inode, index); 83470c3547eSMike Kravetz 83570c3547eSMike Kravetz /* addr is the offset within the file (zero based) */ 83670c3547eSMike Kravetz addr = index * hpage_size; 83770c3547eSMike Kravetz 838188a3972SMike Kravetz /* mutex taken here, fault path and hole punch */ 839188b04a7SWei Yang hash = hugetlb_fault_mutex_hash(mapping, index); 84070c3547eSMike Kravetz mutex_lock(&hugetlb_fault_mutex_table[hash]); 84170c3547eSMike Kravetz 84270c3547eSMike Kravetz /* See if already present in mapping to avoid alloc/free */ 84370c3547eSMike Kravetz page = find_get_page(mapping, index); 84470c3547eSMike Kravetz if (page) { 84570c3547eSMike Kravetz put_page(page); 84670c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 84770c3547eSMike Kravetz hugetlb_drop_vma_policy(&pseudo_vma); 84870c3547eSMike Kravetz continue; 84970c3547eSMike Kravetz } 85070c3547eSMike Kravetz 85188ce3fefSMiaohe Lin /* 85288ce3fefSMiaohe Lin * Allocate page without setting the avoid_reserve argument. 85388ce3fefSMiaohe Lin * There certainly are no reserves associated with the 85488ce3fefSMiaohe Lin * pseudo_vma. However, there could be shared mappings with 85588ce3fefSMiaohe Lin * reserves for the file at the inode level. If we fallocate 85688ce3fefSMiaohe Lin * pages in these areas, we need to consume the reserves 85788ce3fefSMiaohe Lin * to keep reservation accounting consistent. 85888ce3fefSMiaohe Lin */ 85988ce3fefSMiaohe Lin page = alloc_huge_page(&pseudo_vma, addr, 0); 86070c3547eSMike Kravetz hugetlb_drop_vma_policy(&pseudo_vma); 86170c3547eSMike Kravetz if (IS_ERR(page)) { 86270c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 86370c3547eSMike Kravetz error = PTR_ERR(page); 86470c3547eSMike Kravetz goto out; 86570c3547eSMike Kravetz } 86670c3547eSMike Kravetz clear_huge_page(page, addr, pages_per_huge_page(h)); 86770c3547eSMike Kravetz __SetPageUptodate(page); 8687e1813d4SMike Kravetz error = hugetlb_add_to_page_cache(page, mapping, index); 86970c3547eSMike Kravetz if (unlikely(error)) { 870846be085SMike Kravetz restore_reserve_on_error(h, &pseudo_vma, addr, page); 87170c3547eSMike Kravetz put_page(page); 87270c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 87370c3547eSMike Kravetz goto out; 87470c3547eSMike Kravetz } 87570c3547eSMike Kravetz 87670c3547eSMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 87770c3547eSMike Kravetz 8788f251a3dSMike Kravetz SetHPageMigratable(page); 87970c3547eSMike Kravetz /* 8807e1813d4SMike Kravetz * unlock_page because locked by hugetlb_add_to_page_cache() 881585fc0d2SMuchun Song * put_page() due to reference from alloc_huge_page() 88270c3547eSMike Kravetz */ 88370c3547eSMike Kravetz unlock_page(page); 88472639e6dSNadav Amit put_page(page); 88570c3547eSMike Kravetz } 88670c3547eSMike Kravetz 88770c3547eSMike Kravetz if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) 88870c3547eSMike Kravetz i_size_write(inode, offset + len); 889078cd827SDeepa Dinamani inode->i_ctime = current_time(inode); 89070c3547eSMike Kravetz out: 8915955102cSAl Viro inode_unlock(inode); 89270c3547eSMike Kravetz return error; 89370c3547eSMike Kravetz } 89470c3547eSMike Kravetz 895549c7297SChristian Brauner static int hugetlbfs_setattr(struct user_namespace *mnt_userns, 896549c7297SChristian Brauner struct dentry *dentry, struct iattr *attr) 8971da177e4SLinus Torvalds { 8982b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 899a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 9001da177e4SLinus Torvalds int error; 9011da177e4SLinus Torvalds unsigned int ia_valid = attr->ia_valid; 902ff62a342SMarc-André Lureau struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); 9031da177e4SLinus Torvalds 9042f221d6fSChristian Brauner error = setattr_prepare(&init_user_ns, dentry, attr); 9051da177e4SLinus Torvalds if (error) 9061025774cSChristoph Hellwig return error; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds if (ia_valid & ATTR_SIZE) { 909ff62a342SMarc-André Lureau loff_t oldsize = inode->i_size; 910ff62a342SMarc-André Lureau loff_t newsize = attr->ia_size; 911ff62a342SMarc-André Lureau 912ff62a342SMarc-André Lureau if (newsize & ~huge_page_mask(h)) 9131025774cSChristoph Hellwig return -EINVAL; 914398c0da7SMiaohe Lin /* protected by i_rwsem */ 915ff62a342SMarc-André Lureau if ((newsize < oldsize && (info->seals & F_SEAL_SHRINK)) || 916ff62a342SMarc-André Lureau (newsize > oldsize && (info->seals & F_SEAL_GROW))) 917ff62a342SMarc-André Lureau return -EPERM; 918e5d319deSMiaohe Lin hugetlb_vmtruncate(inode, newsize); 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds 9212f221d6fSChristian Brauner setattr_copy(&init_user_ns, inode, attr); 9221025774cSChristoph Hellwig mark_inode_dirty(inode); 9231025774cSChristoph Hellwig return 0; 9241025774cSChristoph Hellwig } 9251025774cSChristoph Hellwig 9267d54fa64SAl Viro static struct inode *hugetlbfs_get_root(struct super_block *sb, 92732021982SDavid Howells struct hugetlbfs_fs_context *ctx) 9281da177e4SLinus Torvalds { 9291da177e4SLinus Torvalds struct inode *inode; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds inode = new_inode(sb); 9321da177e4SLinus Torvalds if (inode) { 93385fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 93432021982SDavid Howells inode->i_mode = S_IFDIR | ctx->mode; 93532021982SDavid Howells inode->i_uid = ctx->uid; 93632021982SDavid Howells inode->i_gid = ctx->gid; 937078cd827SDeepa Dinamani inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 9387d54fa64SAl Viro inode->i_op = &hugetlbfs_dir_inode_operations; 9397d54fa64SAl Viro inode->i_fop = &simple_dir_operations; 9407d54fa64SAl Viro /* directory inodes start off with i_nlink == 2 (for "." entry) */ 9417d54fa64SAl Viro inc_nlink(inode); 94265ed7601SAneesh Kumar K.V lockdep_annotate_inode_mutex_key(inode); 9437d54fa64SAl Viro } 9447d54fa64SAl Viro return inode; 9457d54fa64SAl Viro } 9467d54fa64SAl Viro 947b610ded7SMichal Hocko /* 948c8c06efaSDavidlohr Bueso * Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never 949b610ded7SMichal Hocko * be taken from reclaim -- unlike regular filesystems. This needs an 95088f306b6SKirill A. Shutemov * annotation because huge_pmd_share() does an allocation under hugetlb's 951c8c06efaSDavidlohr Bueso * i_mmap_rwsem. 952b610ded7SMichal Hocko */ 953c8c06efaSDavidlohr Bueso static struct lock_class_key hugetlbfs_i_mmap_rwsem_key; 954b610ded7SMichal Hocko 9557d54fa64SAl Viro static struct inode *hugetlbfs_get_inode(struct super_block *sb, 9567d54fa64SAl Viro struct inode *dir, 95718df2252SAl Viro umode_t mode, dev_t dev) 9587d54fa64SAl Viro { 9597d54fa64SAl Viro struct inode *inode; 96058b6e5e8SMike Kravetz struct resv_map *resv_map = NULL; 9619119a41eSJoonsoo Kim 96258b6e5e8SMike Kravetz /* 96358b6e5e8SMike Kravetz * Reserve maps are only needed for inodes that can have associated 96458b6e5e8SMike Kravetz * page allocations. 96558b6e5e8SMike Kravetz */ 96658b6e5e8SMike Kravetz if (S_ISREG(mode) || S_ISLNK(mode)) { 9679119a41eSJoonsoo Kim resv_map = resv_map_alloc(); 9689119a41eSJoonsoo Kim if (!resv_map) 9699119a41eSJoonsoo Kim return NULL; 97058b6e5e8SMike Kravetz } 9717d54fa64SAl Viro 9727d54fa64SAl Viro inode = new_inode(sb); 9737d54fa64SAl Viro if (inode) { 974ff62a342SMarc-André Lureau struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); 975ff62a342SMarc-André Lureau 9767d54fa64SAl Viro inode->i_ino = get_next_ino(); 97721cb47beSChristian Brauner inode_init_owner(&init_user_ns, inode, dir, mode); 978c8c06efaSDavidlohr Bueso lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, 979c8c06efaSDavidlohr Bueso &hugetlbfs_i_mmap_rwsem_key); 9801da177e4SLinus Torvalds inode->i_mapping->a_ops = &hugetlbfs_aops; 981078cd827SDeepa Dinamani inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 9829119a41eSJoonsoo Kim inode->i_mapping->private_data = resv_map; 983ff62a342SMarc-André Lureau info->seals = F_SEAL_SEAL; 9841da177e4SLinus Torvalds switch (mode & S_IFMT) { 9851da177e4SLinus Torvalds default: 9861da177e4SLinus Torvalds init_special_inode(inode, mode, dev); 9871da177e4SLinus Torvalds break; 9881da177e4SLinus Torvalds case S_IFREG: 9891da177e4SLinus Torvalds inode->i_op = &hugetlbfs_inode_operations; 9901da177e4SLinus Torvalds inode->i_fop = &hugetlbfs_file_operations; 9911da177e4SLinus Torvalds break; 9921da177e4SLinus Torvalds case S_IFDIR: 9931da177e4SLinus Torvalds inode->i_op = &hugetlbfs_dir_inode_operations; 9941da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds /* directory inodes start off with i_nlink == 2 (for "." entry) */ 997d8c76e6fSDave Hansen inc_nlink(inode); 9981da177e4SLinus Torvalds break; 9991da177e4SLinus Torvalds case S_IFLNK: 10001da177e4SLinus Torvalds inode->i_op = &page_symlink_inode_operations; 100121fc61c7SAl Viro inode_nohighmem(inode); 10021da177e4SLinus Torvalds break; 10031da177e4SLinus Torvalds } 1004e096d0c7SJosh Boyer lockdep_annotate_inode_mutex_key(inode); 100558b6e5e8SMike Kravetz } else { 100658b6e5e8SMike Kravetz if (resv_map) 10079119a41eSJoonsoo Kim kref_put(&resv_map->refs, resv_map_release); 100858b6e5e8SMike Kravetz } 10099119a41eSJoonsoo Kim 10101da177e4SLinus Torvalds return inode; 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds /* 10141da177e4SLinus Torvalds * File creation. Allocate an inode, and we're done.. 10151da177e4SLinus Torvalds */ 1016549c7297SChristian Brauner static int hugetlbfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 10171ab5b82fSPiotr Sarna struct dentry *dentry, umode_t mode, dev_t dev) 10181ab5b82fSPiotr Sarna { 101919ee5345SAl Viro struct inode *inode; 102019ee5345SAl Viro 102119ee5345SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev); 102219ee5345SAl Viro if (!inode) 102319ee5345SAl Viro return -ENOSPC; 102419ee5345SAl Viro dir->i_ctime = dir->i_mtime = current_time(dir); 102519ee5345SAl Viro d_instantiate(dentry, inode); 102619ee5345SAl Viro dget(dentry);/* Extra count - pin the dentry in core */ 102719ee5345SAl Viro return 0; 10281ab5b82fSPiotr Sarna } 10291ab5b82fSPiotr Sarna 1030549c7297SChristian Brauner static int hugetlbfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1031549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 10321da177e4SLinus Torvalds { 1033549c7297SChristian Brauner int retval = hugetlbfs_mknod(&init_user_ns, dir, dentry, 1034549c7297SChristian Brauner mode | S_IFDIR, 0); 10351da177e4SLinus Torvalds if (!retval) 1036d8c76e6fSDave Hansen inc_nlink(dir); 10371da177e4SLinus Torvalds return retval; 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds 1040549c7297SChristian Brauner static int hugetlbfs_create(struct user_namespace *mnt_userns, 1041549c7297SChristian Brauner struct inode *dir, struct dentry *dentry, 1042549c7297SChristian Brauner umode_t mode, bool excl) 10431da177e4SLinus Torvalds { 1044549c7297SChristian Brauner return hugetlbfs_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0); 10451da177e4SLinus Torvalds } 10461da177e4SLinus Torvalds 1047549c7297SChristian Brauner static int hugetlbfs_tmpfile(struct user_namespace *mnt_userns, 1048863f144fSMiklos Szeredi struct inode *dir, struct file *file, 1049549c7297SChristian Brauner umode_t mode) 10501ab5b82fSPiotr Sarna { 105119ee5345SAl Viro struct inode *inode; 105219ee5345SAl Viro 105319ee5345SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, mode | S_IFREG, 0); 105419ee5345SAl Viro if (!inode) 105519ee5345SAl Viro return -ENOSPC; 105619ee5345SAl Viro dir->i_ctime = dir->i_mtime = current_time(dir); 1057863f144fSMiklos Szeredi d_tmpfile(file, inode); 1058863f144fSMiklos Szeredi return finish_open_simple(file, 0); 10591ab5b82fSPiotr Sarna } 10601ab5b82fSPiotr Sarna 1061549c7297SChristian Brauner static int hugetlbfs_symlink(struct user_namespace *mnt_userns, 1062549c7297SChristian Brauner struct inode *dir, struct dentry *dentry, 1063549c7297SChristian Brauner const char *symname) 10641da177e4SLinus Torvalds { 10651da177e4SLinus Torvalds struct inode *inode; 10661da177e4SLinus Torvalds int error = -ENOSPC; 10671da177e4SLinus Torvalds 10687d54fa64SAl Viro inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0); 10691da177e4SLinus Torvalds if (inode) { 10701da177e4SLinus Torvalds int l = strlen(symname)+1; 10711da177e4SLinus Torvalds error = page_symlink(inode, symname, l); 10721da177e4SLinus Torvalds if (!error) { 10731da177e4SLinus Torvalds d_instantiate(dentry, inode); 10741da177e4SLinus Torvalds dget(dentry); 10751da177e4SLinus Torvalds } else 10761da177e4SLinus Torvalds iput(inode); 10771da177e4SLinus Torvalds } 1078078cd827SDeepa Dinamani dir->i_ctime = dir->i_mtime = current_time(dir); 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds return error; 10811da177e4SLinus Torvalds } 10821da177e4SLinus Torvalds 1083b890ec2aSMatthew Wilcox (Oracle) #ifdef CONFIG_MIGRATION 1084b890ec2aSMatthew Wilcox (Oracle) static int hugetlbfs_migrate_folio(struct address_space *mapping, 1085b890ec2aSMatthew Wilcox (Oracle) struct folio *dst, struct folio *src, 1086a6bc32b8SMel Gorman enum migrate_mode mode) 1087290408d4SNaoya Horiguchi { 1088290408d4SNaoya Horiguchi int rc; 1089290408d4SNaoya Horiguchi 1090b890ec2aSMatthew Wilcox (Oracle) rc = migrate_huge_page_move_mapping(mapping, dst, src); 109178bd5209SRafael Aquini if (rc != MIGRATEPAGE_SUCCESS) 1092290408d4SNaoya Horiguchi return rc; 1093cb6acd01SMike Kravetz 1094*149562f7SSidhartha Kumar if (hugetlb_folio_subpool(src)) { 1095*149562f7SSidhartha Kumar hugetlb_set_folio_subpool(dst, 1096*149562f7SSidhartha Kumar hugetlb_folio_subpool(src)); 1097*149562f7SSidhartha Kumar hugetlb_set_folio_subpool(src, NULL); 1098cb6acd01SMike Kravetz } 1099cb6acd01SMike Kravetz 11002916ecc0SJérôme Glisse if (mode != MIGRATE_SYNC_NO_COPY) 1101b890ec2aSMatthew Wilcox (Oracle) folio_migrate_copy(dst, src); 11022916ecc0SJérôme Glisse else 1103b890ec2aSMatthew Wilcox (Oracle) folio_migrate_flags(dst, src); 1104290408d4SNaoya Horiguchi 110578bd5209SRafael Aquini return MIGRATEPAGE_SUCCESS; 1106290408d4SNaoya Horiguchi } 1107b890ec2aSMatthew Wilcox (Oracle) #else 1108b890ec2aSMatthew Wilcox (Oracle) #define hugetlbfs_migrate_folio NULL 1109b890ec2aSMatthew Wilcox (Oracle) #endif 1110290408d4SNaoya Horiguchi 111178bb9203SNaoya Horiguchi static int hugetlbfs_error_remove_page(struct address_space *mapping, 111278bb9203SNaoya Horiguchi struct page *page) 111378bb9203SNaoya Horiguchi { 111478bb9203SNaoya Horiguchi struct inode *inode = mapping->host; 1115ab615a5bSMike Kravetz pgoff_t index = page->index; 111678bb9203SNaoya Horiguchi 11177e1813d4SMike Kravetz hugetlb_delete_from_page_cache(page); 1118ab615a5bSMike Kravetz if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1))) 111978bb9203SNaoya Horiguchi hugetlb_fix_reserve_counts(inode); 1120ab615a5bSMike Kravetz 112178bb9203SNaoya Horiguchi return 0; 112278bb9203SNaoya Horiguchi } 112378bb9203SNaoya Horiguchi 11244a25220dSDavid Howells /* 11254a25220dSDavid Howells * Display the mount options in /proc/mounts. 11264a25220dSDavid Howells */ 11274a25220dSDavid Howells static int hugetlbfs_show_options(struct seq_file *m, struct dentry *root) 11284a25220dSDavid Howells { 11294a25220dSDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(root->d_sb); 11304a25220dSDavid Howells struct hugepage_subpool *spool = sbinfo->spool; 11314a25220dSDavid Howells unsigned long hpage_size = huge_page_size(sbinfo->hstate); 11324a25220dSDavid Howells unsigned hpage_shift = huge_page_shift(sbinfo->hstate); 11334a25220dSDavid Howells char mod; 11344a25220dSDavid Howells 11354a25220dSDavid Howells if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) 11364a25220dSDavid Howells seq_printf(m, ",uid=%u", 11374a25220dSDavid Howells from_kuid_munged(&init_user_ns, sbinfo->uid)); 11384a25220dSDavid Howells if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) 11394a25220dSDavid Howells seq_printf(m, ",gid=%u", 11404a25220dSDavid Howells from_kgid_munged(&init_user_ns, sbinfo->gid)); 11414a25220dSDavid Howells if (sbinfo->mode != 0755) 11424a25220dSDavid Howells seq_printf(m, ",mode=%o", sbinfo->mode); 11434a25220dSDavid Howells if (sbinfo->max_inodes != -1) 11444a25220dSDavid Howells seq_printf(m, ",nr_inodes=%lu", sbinfo->max_inodes); 11454a25220dSDavid Howells 11464a25220dSDavid Howells hpage_size /= 1024; 11474a25220dSDavid Howells mod = 'K'; 11484a25220dSDavid Howells if (hpage_size >= 1024) { 11494a25220dSDavid Howells hpage_size /= 1024; 11504a25220dSDavid Howells mod = 'M'; 11514a25220dSDavid Howells } 11524a25220dSDavid Howells seq_printf(m, ",pagesize=%lu%c", hpage_size, mod); 11534a25220dSDavid Howells if (spool) { 11544a25220dSDavid Howells if (spool->max_hpages != -1) 11554a25220dSDavid Howells seq_printf(m, ",size=%llu", 11564a25220dSDavid Howells (unsigned long long)spool->max_hpages << hpage_shift); 11574a25220dSDavid Howells if (spool->min_hpages != -1) 11584a25220dSDavid Howells seq_printf(m, ",min_size=%llu", 11594a25220dSDavid Howells (unsigned long long)spool->min_hpages << hpage_shift); 11604a25220dSDavid Howells } 11614a25220dSDavid Howells return 0; 11624a25220dSDavid Howells } 11634a25220dSDavid Howells 1164726c3342SDavid Howells static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf) 11651da177e4SLinus Torvalds { 1166726c3342SDavid Howells struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(dentry->d_sb); 11672b0143b5SDavid Howells struct hstate *h = hstate_inode(d_inode(dentry)); 11681da177e4SLinus Torvalds 11691da177e4SLinus Torvalds buf->f_type = HUGETLBFS_MAGIC; 1170a5516438SAndi Kleen buf->f_bsize = huge_page_size(h); 11711da177e4SLinus Torvalds if (sbinfo) { 11721da177e4SLinus Torvalds spin_lock(&sbinfo->stat_lock); 117311680763SMiaohe Lin /* If no limits set, just report 0 or -1 for max/free/used 117474a8a65cSDavid Gibson * blocks, like simple_statfs() */ 117590481622SDavid Gibson if (sbinfo->spool) { 117690481622SDavid Gibson long free_pages; 117790481622SDavid Gibson 11784b25f030SMina Almasry spin_lock_irq(&sbinfo->spool->lock); 117990481622SDavid Gibson buf->f_blocks = sbinfo->spool->max_hpages; 118090481622SDavid Gibson free_pages = sbinfo->spool->max_hpages 118190481622SDavid Gibson - sbinfo->spool->used_hpages; 118290481622SDavid Gibson buf->f_bavail = buf->f_bfree = free_pages; 11834b25f030SMina Almasry spin_unlock_irq(&sbinfo->spool->lock); 11841da177e4SLinus Torvalds buf->f_files = sbinfo->max_inodes; 11851da177e4SLinus Torvalds buf->f_ffree = sbinfo->free_inodes; 118674a8a65cSDavid Gibson } 11871da177e4SLinus Torvalds spin_unlock(&sbinfo->stat_lock); 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds buf->f_namelen = NAME_MAX; 11901da177e4SLinus Torvalds return 0; 11911da177e4SLinus Torvalds } 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds static void hugetlbfs_put_super(struct super_block *sb) 11941da177e4SLinus Torvalds { 11951da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbi = HUGETLBFS_SB(sb); 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds if (sbi) { 11981da177e4SLinus Torvalds sb->s_fs_info = NULL; 119990481622SDavid Gibson 120090481622SDavid Gibson if (sbi->spool) 120190481622SDavid Gibson hugepage_put_subpool(sbi->spool); 120290481622SDavid Gibson 12031da177e4SLinus Torvalds kfree(sbi); 12041da177e4SLinus Torvalds } 12051da177e4SLinus Torvalds } 12061da177e4SLinus Torvalds 120796527980SChristoph Hellwig static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo) 120896527980SChristoph Hellwig { 120996527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 121096527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 121196527980SChristoph Hellwig if (unlikely(!sbinfo->free_inodes)) { 121296527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 121396527980SChristoph Hellwig return 0; 121496527980SChristoph Hellwig } 121596527980SChristoph Hellwig sbinfo->free_inodes--; 121696527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 121796527980SChristoph Hellwig } 121896527980SChristoph Hellwig 121996527980SChristoph Hellwig return 1; 122096527980SChristoph Hellwig } 122196527980SChristoph Hellwig 122296527980SChristoph Hellwig static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo) 122396527980SChristoph Hellwig { 122496527980SChristoph Hellwig if (sbinfo->free_inodes >= 0) { 122596527980SChristoph Hellwig spin_lock(&sbinfo->stat_lock); 122696527980SChristoph Hellwig sbinfo->free_inodes++; 122796527980SChristoph Hellwig spin_unlock(&sbinfo->stat_lock); 122896527980SChristoph Hellwig } 122996527980SChristoph Hellwig } 123096527980SChristoph Hellwig 123196527980SChristoph Hellwig 1232e18b890bSChristoph Lameter static struct kmem_cache *hugetlbfs_inode_cachep; 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) 12351da177e4SLinus Torvalds { 123696527980SChristoph Hellwig struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb); 12371da177e4SLinus Torvalds struct hugetlbfs_inode_info *p; 12381da177e4SLinus Torvalds 123996527980SChristoph Hellwig if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo))) 12401da177e4SLinus Torvalds return NULL; 1241fd60b288SMuchun Song p = alloc_inode_sb(sb, hugetlbfs_inode_cachep, GFP_KERNEL); 124296527980SChristoph Hellwig if (unlikely(!p)) { 124396527980SChristoph Hellwig hugetlbfs_inc_free_inodes(sbinfo); 124496527980SChristoph Hellwig return NULL; 12451da177e4SLinus Torvalds } 12464742a35dSMike Kravetz 12474742a35dSMike Kravetz /* 12484742a35dSMike Kravetz * Any time after allocation, hugetlbfs_destroy_inode can be called 12494742a35dSMike Kravetz * for the inode. mpol_free_shared_policy is unconditionally called 12504742a35dSMike Kravetz * as part of hugetlbfs_destroy_inode. So, initialize policy here 12514742a35dSMike Kravetz * in case of a quick call to destroy. 12524742a35dSMike Kravetz * 12534742a35dSMike Kravetz * Note that the policy is initialized even if we are creating a 12544742a35dSMike Kravetz * private inode. This simplifies hugetlbfs_destroy_inode. 12554742a35dSMike Kravetz */ 12564742a35dSMike Kravetz mpol_shared_policy_init(&p->policy, NULL); 12574742a35dSMike Kravetz 125896527980SChristoph Hellwig return &p->vfs_inode; 12591da177e4SLinus Torvalds } 12601da177e4SLinus Torvalds 1261b62de322SAl Viro static void hugetlbfs_free_inode(struct inode *inode) 1262fa0d7e3dSNick Piggin { 1263fa0d7e3dSNick Piggin kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); 1264fa0d7e3dSNick Piggin } 1265fa0d7e3dSNick Piggin 12661da177e4SLinus Torvalds static void hugetlbfs_destroy_inode(struct inode *inode) 12671da177e4SLinus Torvalds { 126896527980SChristoph Hellwig hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb)); 12691da177e4SLinus Torvalds mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds 1272f5e54d6eSChristoph Hellwig static const struct address_space_operations hugetlbfs_aops = { 1273800d15a5SNick Piggin .write_begin = hugetlbfs_write_begin, 1274800d15a5SNick Piggin .write_end = hugetlbfs_write_end, 127546de8b97SMatthew Wilcox (Oracle) .dirty_folio = noop_dirty_folio, 1276b890ec2aSMatthew Wilcox (Oracle) .migrate_folio = hugetlbfs_migrate_folio, 127778bb9203SNaoya Horiguchi .error_remove_page = hugetlbfs_error_remove_page, 12781da177e4SLinus Torvalds }; 12791da177e4SLinus Torvalds 128096527980SChristoph Hellwig 128151cc5068SAlexey Dobriyan static void init_once(void *foo) 128296527980SChristoph Hellwig { 128396527980SChristoph Hellwig struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo; 128496527980SChristoph Hellwig 128596527980SChristoph Hellwig inode_init_once(&ei->vfs_inode); 128696527980SChristoph Hellwig } 128796527980SChristoph Hellwig 12884b6f5d20SArjan van de Ven const struct file_operations hugetlbfs_file_operations = { 128934d0640eSAl Viro .read_iter = hugetlbfs_read_iter, 12901da177e4SLinus Torvalds .mmap = hugetlbfs_file_mmap, 12911b061d92SChristoph Hellwig .fsync = noop_fsync, 12921da177e4SLinus Torvalds .get_unmapped_area = hugetlb_get_unmapped_area, 12936038f373SArnd Bergmann .llseek = default_llseek, 129470c3547eSMike Kravetz .fallocate = hugetlbfs_fallocate, 12951da177e4SLinus Torvalds }; 12961da177e4SLinus Torvalds 129792e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_dir_inode_operations = { 12981da177e4SLinus Torvalds .create = hugetlbfs_create, 12991da177e4SLinus Torvalds .lookup = simple_lookup, 13001da177e4SLinus Torvalds .link = simple_link, 13011da177e4SLinus Torvalds .unlink = simple_unlink, 13021da177e4SLinus Torvalds .symlink = hugetlbfs_symlink, 13031da177e4SLinus Torvalds .mkdir = hugetlbfs_mkdir, 13041da177e4SLinus Torvalds .rmdir = simple_rmdir, 13051da177e4SLinus Torvalds .mknod = hugetlbfs_mknod, 13061da177e4SLinus Torvalds .rename = simple_rename, 13071da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 13081ab5b82fSPiotr Sarna .tmpfile = hugetlbfs_tmpfile, 13091da177e4SLinus Torvalds }; 13101da177e4SLinus Torvalds 131192e1d5beSArjan van de Ven static const struct inode_operations hugetlbfs_inode_operations = { 13121da177e4SLinus Torvalds .setattr = hugetlbfs_setattr, 13131da177e4SLinus Torvalds }; 13141da177e4SLinus Torvalds 1315ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations hugetlbfs_ops = { 13161da177e4SLinus Torvalds .alloc_inode = hugetlbfs_alloc_inode, 1317b62de322SAl Viro .free_inode = hugetlbfs_free_inode, 13181da177e4SLinus Torvalds .destroy_inode = hugetlbfs_destroy_inode, 13192bbbda30SAl Viro .evict_inode = hugetlbfs_evict_inode, 13201da177e4SLinus Torvalds .statfs = hugetlbfs_statfs, 13211da177e4SLinus Torvalds .put_super = hugetlbfs_put_super, 13224a25220dSDavid Howells .show_options = hugetlbfs_show_options, 13231da177e4SLinus Torvalds }; 13241da177e4SLinus Torvalds 13257ca02d0aSMike Kravetz /* 13267ca02d0aSMike Kravetz * Convert size option passed from command line to number of huge pages 13277ca02d0aSMike Kravetz * in the pool specified by hstate. Size option could be in bytes 13287ca02d0aSMike Kravetz * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT). 13297ca02d0aSMike Kravetz */ 13304a25220dSDavid Howells static long 13317ca02d0aSMike Kravetz hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt, 13324a25220dSDavid Howells enum hugetlbfs_size_type val_type) 13337ca02d0aSMike Kravetz { 13347ca02d0aSMike Kravetz if (val_type == NO_SIZE) 13357ca02d0aSMike Kravetz return -1; 13367ca02d0aSMike Kravetz 13377ca02d0aSMike Kravetz if (val_type == SIZE_PERCENT) { 13387ca02d0aSMike Kravetz size_opt <<= huge_page_shift(h); 13397ca02d0aSMike Kravetz size_opt *= h->max_huge_pages; 13407ca02d0aSMike Kravetz do_div(size_opt, 100); 13417ca02d0aSMike Kravetz } 13427ca02d0aSMike Kravetz 13437ca02d0aSMike Kravetz size_opt >>= huge_page_shift(h); 13447ca02d0aSMike Kravetz return size_opt; 13457ca02d0aSMike Kravetz } 13467ca02d0aSMike Kravetz 134732021982SDavid Howells /* 134832021982SDavid Howells * Parse one mount parameter. 134932021982SDavid Howells */ 135032021982SDavid Howells static int hugetlbfs_parse_param(struct fs_context *fc, struct fs_parameter *param) 13511da177e4SLinus Torvalds { 135232021982SDavid Howells struct hugetlbfs_fs_context *ctx = fc->fs_private; 135332021982SDavid Howells struct fs_parse_result result; 135432021982SDavid Howells char *rest; 135532021982SDavid Howells unsigned long ps; 135632021982SDavid Howells int opt; 13571da177e4SLinus Torvalds 1358d7167b14SAl Viro opt = fs_parse(fc, hugetlb_fs_parameters, param, &result); 135932021982SDavid Howells if (opt < 0) 136032021982SDavid Howells return opt; 136132021982SDavid Howells 136232021982SDavid Howells switch (opt) { 136332021982SDavid Howells case Opt_uid: 136432021982SDavid Howells ctx->uid = make_kuid(current_user_ns(), result.uint_32); 136532021982SDavid Howells if (!uid_valid(ctx->uid)) 136632021982SDavid Howells goto bad_val; 13671da177e4SLinus Torvalds return 0; 13681da177e4SLinus Torvalds 1369e73a75faSRandy Dunlap case Opt_gid: 137032021982SDavid Howells ctx->gid = make_kgid(current_user_ns(), result.uint_32); 137132021982SDavid Howells if (!gid_valid(ctx->gid)) 1372e73a75faSRandy Dunlap goto bad_val; 137332021982SDavid Howells return 0; 1374e73a75faSRandy Dunlap 1375e73a75faSRandy Dunlap case Opt_mode: 137632021982SDavid Howells ctx->mode = result.uint_32 & 01777U; 137732021982SDavid Howells return 0; 1378e73a75faSRandy Dunlap 137932021982SDavid Howells case Opt_size: 1380e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 138132021982SDavid Howells if (!isdigit(param->string[0])) 1382e73a75faSRandy Dunlap goto bad_val; 138332021982SDavid Howells ctx->max_size_opt = memparse(param->string, &rest); 138432021982SDavid Howells ctx->max_val_type = SIZE_STD; 1385a137e1ccSAndi Kleen if (*rest == '%') 138632021982SDavid Howells ctx->max_val_type = SIZE_PERCENT; 138732021982SDavid Howells return 0; 13881da177e4SLinus Torvalds 1389e73a75faSRandy Dunlap case Opt_nr_inodes: 1390e73a75faSRandy Dunlap /* memparse() will accept a K/M/G without a digit */ 139132021982SDavid Howells if (!isdigit(param->string[0])) 1392e73a75faSRandy Dunlap goto bad_val; 139332021982SDavid Howells ctx->nr_inodes = memparse(param->string, &rest); 139432021982SDavid Howells return 0; 1395e73a75faSRandy Dunlap 139632021982SDavid Howells case Opt_pagesize: 139732021982SDavid Howells ps = memparse(param->string, &rest); 139832021982SDavid Howells ctx->hstate = size_to_hstate(ps); 139932021982SDavid Howells if (!ctx->hstate) { 1400d0036517SMiaohe Lin pr_err("Unsupported page size %lu MB\n", ps / SZ_1M); 1401a137e1ccSAndi Kleen return -EINVAL; 1402a137e1ccSAndi Kleen } 140332021982SDavid Howells return 0; 1404a137e1ccSAndi Kleen 140532021982SDavid Howells case Opt_min_size: 14067ca02d0aSMike Kravetz /* memparse() will accept a K/M/G without a digit */ 140732021982SDavid Howells if (!isdigit(param->string[0])) 14087ca02d0aSMike Kravetz goto bad_val; 140932021982SDavid Howells ctx->min_size_opt = memparse(param->string, &rest); 141032021982SDavid Howells ctx->min_val_type = SIZE_STD; 14117ca02d0aSMike Kravetz if (*rest == '%') 141232021982SDavid Howells ctx->min_val_type = SIZE_PERCENT; 141332021982SDavid Howells return 0; 14147ca02d0aSMike Kravetz 1415e73a75faSRandy Dunlap default: 1416b4c07bceSLee Schermerhorn return -EINVAL; 1417e73a75faSRandy Dunlap } 141832021982SDavid Howells 141932021982SDavid Howells bad_val: 1420b5db30cfSAl Viro return invalfc(fc, "Bad value '%s' for mount option '%s'\n", 142132021982SDavid Howells param->string, param->key); 14221da177e4SLinus Torvalds } 1423a137e1ccSAndi Kleen 14247ca02d0aSMike Kravetz /* 142532021982SDavid Howells * Validate the parsed options. 142632021982SDavid Howells */ 142732021982SDavid Howells static int hugetlbfs_validate(struct fs_context *fc) 142832021982SDavid Howells { 142932021982SDavid Howells struct hugetlbfs_fs_context *ctx = fc->fs_private; 143032021982SDavid Howells 143132021982SDavid Howells /* 14327ca02d0aSMike Kravetz * Use huge page pool size (in hstate) to convert the size 14337ca02d0aSMike Kravetz * options to number of huge pages. If NO_SIZE, -1 is returned. 14347ca02d0aSMike Kravetz */ 143532021982SDavid Howells ctx->max_hpages = hugetlbfs_size_to_hpages(ctx->hstate, 143632021982SDavid Howells ctx->max_size_opt, 143732021982SDavid Howells ctx->max_val_type); 143832021982SDavid Howells ctx->min_hpages = hugetlbfs_size_to_hpages(ctx->hstate, 143932021982SDavid Howells ctx->min_size_opt, 144032021982SDavid Howells ctx->min_val_type); 14417ca02d0aSMike Kravetz 14427ca02d0aSMike Kravetz /* 14437ca02d0aSMike Kravetz * If max_size was specified, then min_size must be smaller 14447ca02d0aSMike Kravetz */ 144532021982SDavid Howells if (ctx->max_val_type > NO_SIZE && 144632021982SDavid Howells ctx->min_hpages > ctx->max_hpages) { 144732021982SDavid Howells pr_err("Minimum size can not be greater than maximum size\n"); 14487ca02d0aSMike Kravetz return -EINVAL; 1449a137e1ccSAndi Kleen } 1450a137e1ccSAndi Kleen 14511da177e4SLinus Torvalds return 0; 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds static int 145532021982SDavid Howells hugetlbfs_fill_super(struct super_block *sb, struct fs_context *fc) 14561da177e4SLinus Torvalds { 145732021982SDavid Howells struct hugetlbfs_fs_context *ctx = fc->fs_private; 14581da177e4SLinus Torvalds struct hugetlbfs_sb_info *sbinfo; 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL); 14611da177e4SLinus Torvalds if (!sbinfo) 14621da177e4SLinus Torvalds return -ENOMEM; 14631da177e4SLinus Torvalds sb->s_fs_info = sbinfo; 14641da177e4SLinus Torvalds spin_lock_init(&sbinfo->stat_lock); 146532021982SDavid Howells sbinfo->hstate = ctx->hstate; 146632021982SDavid Howells sbinfo->max_inodes = ctx->nr_inodes; 146732021982SDavid Howells sbinfo->free_inodes = ctx->nr_inodes; 146890481622SDavid Gibson sbinfo->spool = NULL; 146932021982SDavid Howells sbinfo->uid = ctx->uid; 147032021982SDavid Howells sbinfo->gid = ctx->gid; 147132021982SDavid Howells sbinfo->mode = ctx->mode; 14724a25220dSDavid Howells 14737ca02d0aSMike Kravetz /* 14747ca02d0aSMike Kravetz * Allocate and initialize subpool if maximum or minimum size is 14751935ebd3SMiaohe Lin * specified. Any needed reservations (for minimum size) are taken 1476445c8098SMiaohe Lin * when the subpool is created. 14777ca02d0aSMike Kravetz */ 147832021982SDavid Howells if (ctx->max_hpages != -1 || ctx->min_hpages != -1) { 147932021982SDavid Howells sbinfo->spool = hugepage_new_subpool(ctx->hstate, 148032021982SDavid Howells ctx->max_hpages, 148132021982SDavid Howells ctx->min_hpages); 148290481622SDavid Gibson if (!sbinfo->spool) 148390481622SDavid Gibson goto out_free; 148490481622SDavid Gibson } 14851da177e4SLinus Torvalds sb->s_maxbytes = MAX_LFS_FILESIZE; 148632021982SDavid Howells sb->s_blocksize = huge_page_size(ctx->hstate); 148732021982SDavid Howells sb->s_blocksize_bits = huge_page_shift(ctx->hstate); 14881da177e4SLinus Torvalds sb->s_magic = HUGETLBFS_MAGIC; 14891da177e4SLinus Torvalds sb->s_op = &hugetlbfs_ops; 14901da177e4SLinus Torvalds sb->s_time_gran = 1; 149115568299SMike Kravetz 149215568299SMike Kravetz /* 149315568299SMike Kravetz * Due to the special and limited functionality of hugetlbfs, it does 149415568299SMike Kravetz * not work well as a stacking filesystem. 149515568299SMike Kravetz */ 149615568299SMike Kravetz sb->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; 149732021982SDavid Howells sb->s_root = d_make_root(hugetlbfs_get_root(sb, ctx)); 149848fde701SAl Viro if (!sb->s_root) 14991da177e4SLinus Torvalds goto out_free; 15001da177e4SLinus Torvalds return 0; 15011da177e4SLinus Torvalds out_free: 150290481622SDavid Gibson kfree(sbinfo->spool); 15031da177e4SLinus Torvalds kfree(sbinfo); 15041da177e4SLinus Torvalds return -ENOMEM; 15051da177e4SLinus Torvalds } 15061da177e4SLinus Torvalds 150732021982SDavid Howells static int hugetlbfs_get_tree(struct fs_context *fc) 15081da177e4SLinus Torvalds { 150932021982SDavid Howells int err = hugetlbfs_validate(fc); 151032021982SDavid Howells if (err) 151132021982SDavid Howells return err; 15122ac295d4SAl Viro return get_tree_nodev(fc, hugetlbfs_fill_super); 151332021982SDavid Howells } 151432021982SDavid Howells 151532021982SDavid Howells static void hugetlbfs_fs_context_free(struct fs_context *fc) 151632021982SDavid Howells { 151732021982SDavid Howells kfree(fc->fs_private); 151832021982SDavid Howells } 151932021982SDavid Howells 152032021982SDavid Howells static const struct fs_context_operations hugetlbfs_fs_context_ops = { 152132021982SDavid Howells .free = hugetlbfs_fs_context_free, 152232021982SDavid Howells .parse_param = hugetlbfs_parse_param, 152332021982SDavid Howells .get_tree = hugetlbfs_get_tree, 152432021982SDavid Howells }; 152532021982SDavid Howells 152632021982SDavid Howells static int hugetlbfs_init_fs_context(struct fs_context *fc) 152732021982SDavid Howells { 152832021982SDavid Howells struct hugetlbfs_fs_context *ctx; 152932021982SDavid Howells 153032021982SDavid Howells ctx = kzalloc(sizeof(struct hugetlbfs_fs_context), GFP_KERNEL); 153132021982SDavid Howells if (!ctx) 153232021982SDavid Howells return -ENOMEM; 153332021982SDavid Howells 153432021982SDavid Howells ctx->max_hpages = -1; /* No limit on size by default */ 153532021982SDavid Howells ctx->nr_inodes = -1; /* No limit on number of inodes by default */ 153632021982SDavid Howells ctx->uid = current_fsuid(); 153732021982SDavid Howells ctx->gid = current_fsgid(); 153832021982SDavid Howells ctx->mode = 0755; 153932021982SDavid Howells ctx->hstate = &default_hstate; 154032021982SDavid Howells ctx->min_hpages = -1; /* No default minimum size */ 154132021982SDavid Howells ctx->max_val_type = NO_SIZE; 154232021982SDavid Howells ctx->min_val_type = NO_SIZE; 154332021982SDavid Howells fc->fs_private = ctx; 154432021982SDavid Howells fc->ops = &hugetlbfs_fs_context_ops; 154532021982SDavid Howells return 0; 15461da177e4SLinus Torvalds } 15471da177e4SLinus Torvalds 15481da177e4SLinus Torvalds static struct file_system_type hugetlbfs_fs_type = { 15491da177e4SLinus Torvalds .name = "hugetlbfs", 155032021982SDavid Howells .init_fs_context = hugetlbfs_init_fs_context, 1551d7167b14SAl Viro .parameters = hugetlb_fs_parameters, 15521da177e4SLinus Torvalds .kill_sb = kill_litter_super, 15531da177e4SLinus Torvalds }; 15541da177e4SLinus Torvalds 155542d7395fSAndi Kleen static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE]; 15561da177e4SLinus Torvalds 1557ef1ff6b8SFrom: Mel Gorman static int can_do_hugetlb_shm(void) 15581da177e4SLinus Torvalds { 1559a0eb3a05SEric W. Biederman kgid_t shm_group; 1560a0eb3a05SEric W. Biederman shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group); 1561a0eb3a05SEric W. Biederman return capable(CAP_IPC_LOCK) || in_group_p(shm_group); 15621da177e4SLinus Torvalds } 15631da177e4SLinus Torvalds 156442d7395fSAndi Kleen static int get_hstate_idx(int page_size_log) 156542d7395fSAndi Kleen { 1566af73e4d9SNaoya Horiguchi struct hstate *h = hstate_sizelog(page_size_log); 156742d7395fSAndi Kleen 156842d7395fSAndi Kleen if (!h) 156942d7395fSAndi Kleen return -1; 157004adbc3fSMiaohe Lin return hstate_index(h); 157142d7395fSAndi Kleen } 157242d7395fSAndi Kleen 1573af73e4d9SNaoya Horiguchi /* 1574af73e4d9SNaoya Horiguchi * Note that size should be aligned to proper hugepage size in caller side, 1575af73e4d9SNaoya Horiguchi * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. 1576af73e4d9SNaoya Horiguchi */ 1577af73e4d9SNaoya Horiguchi struct file *hugetlb_file_setup(const char *name, size_t size, 157883c1fd76Szhangyiru vm_flags_t acctflag, int creat_flags, 157983c1fd76Szhangyiru int page_size_log) 15801da177e4SLinus Torvalds { 15811da177e4SLinus Torvalds struct inode *inode; 1582e68375c8SAl Viro struct vfsmount *mnt; 158342d7395fSAndi Kleen int hstate_idx; 1584e68375c8SAl Viro struct file *file; 158542d7395fSAndi Kleen 158642d7395fSAndi Kleen hstate_idx = get_hstate_idx(page_size_log); 158742d7395fSAndi Kleen if (hstate_idx < 0) 158842d7395fSAndi Kleen return ERR_PTR(-ENODEV); 15891da177e4SLinus Torvalds 1590e68375c8SAl Viro mnt = hugetlbfs_vfsmount[hstate_idx]; 1591e68375c8SAl Viro if (!mnt) 15925bc98594SAkinobu Mita return ERR_PTR(-ENOENT); 15935bc98594SAkinobu Mita 1594ef1ff6b8SFrom: Mel Gorman if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { 159583c1fd76Szhangyiru struct ucounts *ucounts = current_ucounts(); 159683c1fd76Szhangyiru 159783c1fd76Szhangyiru if (user_shm_lock(size, ucounts)) { 159883c1fd76Szhangyiru pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is obsolete\n", 159921a3c273SDavid Rientjes current->comm, current->pid); 160083c1fd76Szhangyiru user_shm_unlock(size, ucounts); 16012584e517SRavikiran G Thirumalai } 160283c1fd76Szhangyiru return ERR_PTR(-EPERM); 1603353d5c30SHugh Dickins } 16041da177e4SLinus Torvalds 160539b65252SAnatol Pomozov file = ERR_PTR(-ENOSPC); 1606e68375c8SAl Viro inode = hugetlbfs_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0); 16071da177e4SLinus Torvalds if (!inode) 1608e68375c8SAl Viro goto out; 1609e1832f29SStephen Smalley if (creat_flags == HUGETLB_SHMFS_INODE) 1610e1832f29SStephen Smalley inode->i_flags |= S_PRIVATE; 16111da177e4SLinus Torvalds 16121da177e4SLinus Torvalds inode->i_size = size; 16136d6b77f1SMiklos Szeredi clear_nlink(inode); 1614ce8d2cdfSDave Hansen 161533b8f84aSMike Kravetz if (!hugetlb_reserve_pages(inode, 0, 1616e68375c8SAl Viro size >> huge_page_shift(hstate_inode(inode)), NULL, 1617e68375c8SAl Viro acctflag)) 1618e68375c8SAl Viro file = ERR_PTR(-ENOMEM); 1619e68375c8SAl Viro else 1620e68375c8SAl Viro file = alloc_file_pseudo(inode, mnt, name, O_RDWR, 1621ce8d2cdfSDave Hansen &hugetlbfs_file_operations); 1622e68375c8SAl Viro if (!IS_ERR(file)) 16231da177e4SLinus Torvalds return file; 16241da177e4SLinus Torvalds 1625b45b5bd6SDavid Gibson iput(inode); 1626e68375c8SAl Viro out: 162739b65252SAnatol Pomozov return file; 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 163032021982SDavid Howells static struct vfsmount *__init mount_one_hugetlbfs(struct hstate *h) 163132021982SDavid Howells { 163232021982SDavid Howells struct fs_context *fc; 163332021982SDavid Howells struct vfsmount *mnt; 163432021982SDavid Howells 163532021982SDavid Howells fc = fs_context_for_mount(&hugetlbfs_fs_type, SB_KERNMOUNT); 163632021982SDavid Howells if (IS_ERR(fc)) { 163732021982SDavid Howells mnt = ERR_CAST(fc); 163832021982SDavid Howells } else { 163932021982SDavid Howells struct hugetlbfs_fs_context *ctx = fc->fs_private; 164032021982SDavid Howells ctx->hstate = h; 164132021982SDavid Howells mnt = fc_mount(fc); 164232021982SDavid Howells put_fs_context(fc); 164332021982SDavid Howells } 164432021982SDavid Howells if (IS_ERR(mnt)) 1645a25fddceSMiaohe Lin pr_err("Cannot mount internal hugetlbfs for page size %luK", 1646d0036517SMiaohe Lin huge_page_size(h) / SZ_1K); 164732021982SDavid Howells return mnt; 164832021982SDavid Howells } 164932021982SDavid Howells 16501da177e4SLinus Torvalds static int __init init_hugetlbfs_fs(void) 16511da177e4SLinus Torvalds { 165232021982SDavid Howells struct vfsmount *mnt; 165342d7395fSAndi Kleen struct hstate *h; 16541da177e4SLinus Torvalds int error; 165542d7395fSAndi Kleen int i; 16561da177e4SLinus Torvalds 1657457c1b27SNishanth Aravamudan if (!hugepages_supported()) { 16589b857d26SAndrew Morton pr_info("disabling because there are no supported hugepage sizes\n"); 1659457c1b27SNishanth Aravamudan return -ENOTSUPP; 1660457c1b27SNishanth Aravamudan } 1661457c1b27SNishanth Aravamudan 1662d1d5e05fSHillf Danton error = -ENOMEM; 16631da177e4SLinus Torvalds hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", 16641da177e4SLinus Torvalds sizeof(struct hugetlbfs_inode_info), 16655d097056SVladimir Davydov 0, SLAB_ACCOUNT, init_once); 16661da177e4SLinus Torvalds if (hugetlbfs_inode_cachep == NULL) 16678fc312b3SMike Kravetz goto out; 16681da177e4SLinus Torvalds 16691da177e4SLinus Torvalds error = register_filesystem(&hugetlbfs_fs_type); 16701da177e4SLinus Torvalds if (error) 16718fc312b3SMike Kravetz goto out_free; 16721da177e4SLinus Torvalds 16738fc312b3SMike Kravetz /* default hstate mount is required */ 16743b2275a8SMiaohe Lin mnt = mount_one_hugetlbfs(&default_hstate); 16758fc312b3SMike Kravetz if (IS_ERR(mnt)) { 16768fc312b3SMike Kravetz error = PTR_ERR(mnt); 16778fc312b3SMike Kravetz goto out_unreg; 16788fc312b3SMike Kravetz } 16798fc312b3SMike Kravetz hugetlbfs_vfsmount[default_hstate_idx] = mnt; 16808fc312b3SMike Kravetz 16818fc312b3SMike Kravetz /* other hstates are optional */ 168242d7395fSAndi Kleen i = 0; 168342d7395fSAndi Kleen for_each_hstate(h) { 168415f0ec94SJan Stancek if (i == default_hstate_idx) { 168515f0ec94SJan Stancek i++; 16868fc312b3SMike Kravetz continue; 168715f0ec94SJan Stancek } 16888fc312b3SMike Kravetz 168932021982SDavid Howells mnt = mount_one_hugetlbfs(h); 16908fc312b3SMike Kravetz if (IS_ERR(mnt)) 16918fc312b3SMike Kravetz hugetlbfs_vfsmount[i] = NULL; 16928fc312b3SMike Kravetz else 169332021982SDavid Howells hugetlbfs_vfsmount[i] = mnt; 169442d7395fSAndi Kleen i++; 169542d7395fSAndi Kleen } 169632021982SDavid Howells 169742d7395fSAndi Kleen return 0; 16981da177e4SLinus Torvalds 16998fc312b3SMike Kravetz out_unreg: 17008fc312b3SMike Kravetz (void)unregister_filesystem(&hugetlbfs_fs_type); 17018fc312b3SMike Kravetz out_free: 17021da177e4SLinus Torvalds kmem_cache_destroy(hugetlbfs_inode_cachep); 17038fc312b3SMike Kravetz out: 17041da177e4SLinus Torvalds return error; 17051da177e4SLinus Torvalds } 17063e89e1c5SPaul Gortmaker fs_initcall(init_hugetlbfs_fs) 1707