diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/llite_mmap.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/llite_mmap.c | 478 |
1 files changed, 0 insertions, 478 deletions
diff --git a/drivers/staging/lustre/lustre/llite/llite_mmap.c b/drivers/staging/lustre/lustre/llite/llite_mmap.c deleted file mode 100644 index 214b07554e62..000000000000 --- a/drivers/staging/lustre/lustre/llite/llite_mmap.c +++ /dev/null @@ -1,478 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * GPL HEADER START - * - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License version 2 for more details (a copy is included - * in the LICENSE file that accompanied this code). - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; If not, see - * http://www.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2011, 2015, Intel Corporation. - */ -/* - * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. - */ - -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/string.h> -#include <linux/stat.h> -#include <linux/errno.h> -#include <linux/unistd.h> -#include <linux/uaccess.h> - -#include <linux/fs.h> -#include <linux/pagemap.h> - -#define DEBUG_SUBSYSTEM S_LLITE - -#include "llite_internal.h" - -static const struct vm_operations_struct ll_file_vm_ops; - -void policy_from_vma(union ldlm_policy_data *policy, - struct vm_area_struct *vma, unsigned long addr, - size_t count) -{ - policy->l_extent.start = ((addr - vma->vm_start) & PAGE_MASK) + - (vma->vm_pgoff << PAGE_SHIFT); - policy->l_extent.end = (policy->l_extent.start + count - 1) | - ~PAGE_MASK; -} - -struct vm_area_struct *our_vma(struct mm_struct *mm, unsigned long addr, - size_t count) -{ - struct vm_area_struct *vma, *ret = NULL; - - /* mmap_sem must have been held by caller. */ - LASSERT(!down_write_trylock(&mm->mmap_sem)); - - for (vma = find_vma(mm, addr); - vma && vma->vm_start < (addr + count); vma = vma->vm_next) { - if (vma->vm_ops && vma->vm_ops == &ll_file_vm_ops && - vma->vm_flags & VM_SHARED) { - ret = vma; - break; - } - } - return ret; -} - -/** - * API independent part for page fault initialization. - * \param vma - virtual memory area addressed to page fault - * \param env - corespondent lu_env to processing - * \param index - page index corespondent to fault. - * \parm ra_flags - vma readahead flags. - * - * \return error codes from cl_io_init. - */ -static struct cl_io * -ll_fault_io_init(struct lu_env *env, struct vm_area_struct *vma, - pgoff_t index, unsigned long *ra_flags) -{ - struct file *file = vma->vm_file; - struct inode *inode = file_inode(file); - struct cl_io *io; - struct cl_fault_io *fio; - int rc; - - if (ll_file_nolock(file)) - return ERR_PTR(-EOPNOTSUPP); - -restart: - io = vvp_env_thread_io(env); - io->ci_obj = ll_i2info(inode)->lli_clob; - LASSERT(io->ci_obj); - - fio = &io->u.ci_fault; - fio->ft_index = index; - fio->ft_executable = vma->vm_flags & VM_EXEC; - - /* - * disable VM_SEQ_READ and use VM_RAND_READ to make sure that - * the kernel will not read other pages not covered by ldlm in - * filemap_nopage. we do our readahead in ll_readpage. - */ - if (ra_flags) - *ra_flags = vma->vm_flags & (VM_RAND_READ | VM_SEQ_READ); - vma->vm_flags &= ~VM_SEQ_READ; - vma->vm_flags |= VM_RAND_READ; - - CDEBUG(D_MMAP, "vm_flags: %lx (%lu %d)\n", vma->vm_flags, - fio->ft_index, fio->ft_executable); - - rc = cl_io_init(env, io, CIT_FAULT, io->ci_obj); - if (rc == 0) { - struct vvp_io *vio = vvp_env_io(env); - struct ll_file_data *fd = LUSTRE_FPRIVATE(file); - - LASSERT(vio->vui_cl.cis_io == io); - - /* mmap lock must be MANDATORY it has to cache pages. */ - io->ci_lockreq = CILR_MANDATORY; - vio->vui_fd = fd; - } else { - LASSERT(rc < 0); - cl_io_fini(env, io); - if (io->ci_need_restart) - goto restart; - - io = ERR_PTR(rc); - } - - return io; -} - -/* Sharing code of page_mkwrite method for rhel5 and rhel6 */ -static int ll_page_mkwrite0(struct vm_area_struct *vma, struct page *vmpage, - bool *retry) -{ - struct lu_env *env; - struct cl_io *io; - struct vvp_io *vio; - int result; - u16 refcheck; - sigset_t set; - struct inode *inode; - struct ll_inode_info *lli; - - env = cl_env_get(&refcheck); - if (IS_ERR(env)) - return PTR_ERR(env); - - io = ll_fault_io_init(env, vma, vmpage->index, NULL); - if (IS_ERR(io)) { - result = PTR_ERR(io); - goto out; - } - - result = io->ci_result; - if (result < 0) - goto out_io; - - io->u.ci_fault.ft_mkwrite = 1; - io->u.ci_fault.ft_writable = 1; - - vio = vvp_env_io(env); - vio->u.fault.ft_vma = vma; - vio->u.fault.ft_vmpage = vmpage; - - cfs_block_sigsinv(sigmask(SIGKILL) | sigmask(SIGTERM), &set); - - inode = vvp_object_inode(io->ci_obj); - lli = ll_i2info(inode); - - result = cl_io_loop(env, io); - - cfs_restore_sigs(&set); - - if (result == 0) { - struct inode *inode = file_inode(vma->vm_file); - struct ll_inode_info *lli = ll_i2info(inode); - - lock_page(vmpage); - if (!vmpage->mapping) { - unlock_page(vmpage); - - /* page was truncated and lock was cancelled, return - * ENODATA so that VM_FAULT_NOPAGE will be returned - * to handle_mm_fault(). - */ - if (result == 0) - result = -ENODATA; - } else if (!PageDirty(vmpage)) { - /* race, the page has been cleaned by ptlrpcd after - * it was unlocked, it has to be added into dirty - * cache again otherwise this soon-to-dirty page won't - * consume any grants, even worse if this page is being - * transferred because it will break RPC checksum. - */ - unlock_page(vmpage); - - CDEBUG(D_MMAP, - "Race on page_mkwrite %p/%lu, page has been written out, retry.\n", - vmpage, vmpage->index); - - *retry = true; - result = -EAGAIN; - } - - if (!result) - set_bit(LLIF_DATA_MODIFIED, &lli->lli_flags); - } - -out_io: - cl_io_fini(env, io); -out: - cl_env_put(env, &refcheck); - CDEBUG(D_MMAP, "%s mkwrite with %d\n", current->comm, result); - LASSERT(ergo(result == 0, PageLocked(vmpage))); - - return result; -} - -static inline int to_fault_error(int result) -{ - switch (result) { - case 0: - result = VM_FAULT_LOCKED; - break; - case -EFAULT: - result = VM_FAULT_NOPAGE; - break; - case -ENOMEM: - result = VM_FAULT_OOM; - break; - default: - result = VM_FAULT_SIGBUS; - break; - } - return result; -} - -/** - * Lustre implementation of a vm_operations_struct::fault() method, called by - * VM to server page fault (both in kernel and user space). - * - * \param vma - is virtual area struct related to page fault - * \param vmf - structure which describe type and address where hit fault - * - * \return allocated and filled _locked_ page for address - * \retval VM_FAULT_ERROR on general error - * \retval NOPAGE_OOM not have memory for allocate new page - */ -static int ll_fault0(struct vm_area_struct *vma, struct vm_fault *vmf) -{ - struct lu_env *env; - struct cl_io *io; - struct vvp_io *vio = NULL; - struct page *vmpage; - unsigned long ra_flags; - int result = 0; - int fault_ret = 0; - u16 refcheck; - - env = cl_env_get(&refcheck); - if (IS_ERR(env)) - return PTR_ERR(env); - - io = ll_fault_io_init(env, vma, vmf->pgoff, &ra_flags); - if (IS_ERR(io)) { - result = to_fault_error(PTR_ERR(io)); - goto out; - } - - result = io->ci_result; - if (result == 0) { - vio = vvp_env_io(env); - vio->u.fault.ft_vma = vma; - vio->u.fault.ft_vmpage = NULL; - vio->u.fault.ft_vmf = vmf; - vio->u.fault.ft_flags = 0; - vio->u.fault.ft_flags_valid = false; - - /* May call ll_readpage() */ - ll_cl_add(vma->vm_file, env, io); - - result = cl_io_loop(env, io); - - ll_cl_remove(vma->vm_file, env); - - /* ft_flags are only valid if we reached - * the call to filemap_fault - */ - if (vio->u.fault.ft_flags_valid) - fault_ret = vio->u.fault.ft_flags; - - vmpage = vio->u.fault.ft_vmpage; - if (result != 0 && vmpage) { - put_page(vmpage); - vmf->page = NULL; - } - } - cl_io_fini(env, io); - - vma->vm_flags |= ra_flags; - -out: - cl_env_put(env, &refcheck); - if (result != 0 && !(fault_ret & VM_FAULT_RETRY)) - fault_ret |= to_fault_error(result); - - CDEBUG(D_MMAP, "%s fault %d/%d\n", current->comm, fault_ret, result); - return fault_ret; -} - -static int ll_fault(struct vm_fault *vmf) -{ - int count = 0; - bool printed = false; - int result; - sigset_t set; - - /* Only SIGKILL and SIGTERM are allowed for fault/nopage/mkwrite - * so that it can be killed by admin but not cause segfault by - * other signals. - */ - cfs_block_sigsinv(sigmask(SIGKILL) | sigmask(SIGTERM), &set); - -restart: - result = ll_fault0(vmf->vma, vmf); - LASSERT(!(result & VM_FAULT_LOCKED)); - if (result == 0) { - struct page *vmpage = vmf->page; - - /* check if this page has been truncated */ - lock_page(vmpage); - if (unlikely(!vmpage->mapping)) { /* unlucky */ - unlock_page(vmpage); - put_page(vmpage); - vmf->page = NULL; - - if (!printed && ++count > 16) { - CWARN("the page is under heavy contention, maybe your app(%s) needs revising :-)\n", - current->comm); - printed = true; - } - - goto restart; - } - - result = VM_FAULT_LOCKED; - } - cfs_restore_sigs(&set); - return result; -} - -static int ll_page_mkwrite(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - int count = 0; - bool printed = false; - bool retry; - int result; - - file_update_time(vma->vm_file); - do { - retry = false; - result = ll_page_mkwrite0(vma, vmf->page, &retry); - - if (!printed && ++count > 16) { - const struct dentry *de = vma->vm_file->f_path.dentry; - - CWARN("app(%s): the page %lu of file " DFID " is under heavy contention\n", - current->comm, vmf->pgoff, - PFID(ll_inode2fid(de->d_inode))); - printed = true; - } - } while (retry); - - switch (result) { - case 0: - LASSERT(PageLocked(vmf->page)); - result = VM_FAULT_LOCKED; - break; - case -ENODATA: - case -EAGAIN: - case -EFAULT: - result = VM_FAULT_NOPAGE; - break; - case -ENOMEM: - result = VM_FAULT_OOM; - break; - default: - result = VM_FAULT_SIGBUS; - break; - } - - return result; -} - -/** - * To avoid cancel the locks covering mmapped region for lock cache pressure, - * we track the mapped vma count in vvp_object::vob_mmap_cnt. - */ -static void ll_vm_open(struct vm_area_struct *vma) -{ - struct inode *inode = file_inode(vma->vm_file); - struct vvp_object *vob = cl_inode2vvp(inode); - - LASSERT(atomic_read(&vob->vob_mmap_cnt) >= 0); - atomic_inc(&vob->vob_mmap_cnt); -} - -/** - * Dual to ll_vm_open(). - */ -static void ll_vm_close(struct vm_area_struct *vma) -{ - struct inode *inode = file_inode(vma->vm_file); - struct vvp_object *vob = cl_inode2vvp(inode); - - atomic_dec(&vob->vob_mmap_cnt); - LASSERT(atomic_read(&vob->vob_mmap_cnt) >= 0); -} - -/* XXX put nice comment here. talk about __free_pte -> dirty pages and - * nopage's reference passing to the pte - */ -int ll_teardown_mmaps(struct address_space *mapping, __u64 first, __u64 last) -{ - int rc = -ENOENT; - - LASSERTF(last > first, "last %llu first %llu\n", last, first); - if (mapping_mapped(mapping)) { - rc = 0; - unmap_mapping_range(mapping, first + PAGE_SIZE - 1, - last - first + 1, 0); - } - - return rc; -} - -static const struct vm_operations_struct ll_file_vm_ops = { - .fault = ll_fault, - .page_mkwrite = ll_page_mkwrite, - .open = ll_vm_open, - .close = ll_vm_close, -}; - -int ll_file_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct inode *inode = file_inode(file); - int rc; - - if (ll_file_nolock(file)) - return -EOPNOTSUPP; - - ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_MAP, 1); - rc = generic_file_mmap(file, vma); - if (rc == 0) { - vma->vm_ops = &ll_file_vm_ops; - vma->vm_ops->open(vma); - /* update the inode's size and mtime */ - rc = ll_glimpse_size(inode); - } - - return rc; -} |