| /* |
| * 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.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2011, 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * Implementation of cl_io for VVP layer. |
| * |
| * Author: Nikita Danilov <nikita.danilov@sun.com> |
| * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com> |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LLITE |
| |
| |
| #include "../include/obd.h" |
| #include "../include/lustre_lite.h" |
| |
| #include "vvp_internal.h" |
| |
| static struct vvp_io *cl2vvp_io(const struct lu_env *env, |
| const struct cl_io_slice *slice); |
| |
| /** |
| * True, if \a io is a normal io, False for splice_{read,write} |
| */ |
| int cl_is_normalio(const struct lu_env *env, const struct cl_io *io) |
| { |
| struct vvp_io *vio = vvp_env_io(env); |
| |
| LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); |
| |
| return vio->cui_io_subtype == IO_NORMAL; |
| } |
| |
| /** |
| * For swapping layout. The file's layout may have changed. |
| * To avoid populating pages to a wrong stripe, we have to verify the |
| * correctness of layout. It works because swapping layout processes |
| * have to acquire group lock. |
| */ |
| static bool can_populate_pages(const struct lu_env *env, struct cl_io *io, |
| struct inode *inode) |
| { |
| struct ll_inode_info *lli = ll_i2info(inode); |
| struct ccc_io *cio = ccc_env_io(env); |
| bool rc = true; |
| |
| switch (io->ci_type) { |
| case CIT_READ: |
| case CIT_WRITE: |
| /* don't need lock here to check lli_layout_gen as we have held |
| * extent lock and GROUP lock has to hold to swap layout */ |
| if (ll_layout_version_get(lli) != cio->cui_layout_gen) { |
| io->ci_need_restart = 1; |
| /* this will return application a short read/write */ |
| io->ci_continue = 0; |
| rc = false; |
| } |
| case CIT_FAULT: |
| /* fault is okay because we've already had a page. */ |
| default: |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /***************************************************************************** |
| * |
| * io operations. |
| * |
| */ |
| |
| static int vvp_io_fault_iter_init(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct vvp_io *vio = cl2vvp_io(env, ios); |
| struct inode *inode = ccc_object_inode(ios->cis_obj); |
| |
| LASSERT(inode == |
| file_inode(cl2ccc_io(env, ios)->cui_fd->fd_file)); |
| vio->u.fault.ft_mtime = LTIME_S(inode->i_mtime); |
| return 0; |
| } |
| |
| static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct cl_object *obj = io->ci_obj; |
| struct ccc_io *cio = cl2ccc_io(env, ios); |
| |
| CLOBINVRNT(env, obj, ccc_object_invariant(obj)); |
| |
| CDEBUG(D_VFSTRACE, DFID |
| " ignore/verify layout %d/%d, layout version %d restore needed %d\n", |
| PFID(lu_object_fid(&obj->co_lu)), |
| io->ci_ignore_layout, io->ci_verify_layout, |
| cio->cui_layout_gen, io->ci_restore_needed); |
| |
| if (io->ci_restore_needed == 1) { |
| int rc; |
| |
| /* file was detected release, we need to restore it |
| * before finishing the io |
| */ |
| rc = ll_layout_restore(ccc_object_inode(obj)); |
| /* if restore registration failed, no restart, |
| * we will return -ENODATA */ |
| /* The layout will change after restore, so we need to |
| * block on layout lock hold by the MDT |
| * as MDT will not send new layout in lvb (see LU-3124) |
| * we have to explicitly fetch it, all this will be done |
| * by ll_layout_refresh() |
| */ |
| if (rc == 0) { |
| io->ci_restore_needed = 0; |
| io->ci_need_restart = 1; |
| io->ci_verify_layout = 1; |
| } else { |
| io->ci_restore_needed = 1; |
| io->ci_need_restart = 0; |
| io->ci_verify_layout = 0; |
| io->ci_result = rc; |
| } |
| } |
| |
| if (!io->ci_ignore_layout && io->ci_verify_layout) { |
| __u32 gen = 0; |
| |
| /* check layout version */ |
| ll_layout_refresh(ccc_object_inode(obj), &gen); |
| io->ci_need_restart = cio->cui_layout_gen != gen; |
| if (io->ci_need_restart) { |
| CDEBUG(D_VFSTRACE, |
| DFID" layout changed from %d to %d.\n", |
| PFID(lu_object_fid(&obj->co_lu)), |
| cio->cui_layout_gen, gen); |
| /* today successful restore is the only possible |
| * case */ |
| /* restore was done, clear restoring state */ |
| ll_i2info(ccc_object_inode(obj))->lli_flags &= |
| ~LLIF_FILE_RESTORING; |
| } |
| } |
| } |
| |
| static void vvp_io_fault_fini(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct cl_page *page = io->u.ci_fault.ft_page; |
| |
| CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj)); |
| |
| if (page != NULL) { |
| lu_ref_del(&page->cp_reference, "fault", io); |
| cl_page_put(env, page); |
| io->u.ci_fault.ft_page = NULL; |
| } |
| vvp_io_fini(env, ios); |
| } |
| |
| static enum cl_lock_mode vvp_mode_from_vma(struct vm_area_struct *vma) |
| { |
| /* |
| * we only want to hold PW locks if the mmap() can generate |
| * writes back to the file and that only happens in shared |
| * writable vmas |
| */ |
| if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) |
| return CLM_WRITE; |
| return CLM_READ; |
| } |
| |
| static int vvp_mmap_locks(const struct lu_env *env, |
| struct ccc_io *vio, struct cl_io *io) |
| { |
| struct ccc_thread_info *cti = ccc_env_info(env); |
| struct mm_struct *mm = current->mm; |
| struct vm_area_struct *vma; |
| struct cl_lock_descr *descr = &cti->cti_descr; |
| ldlm_policy_data_t policy; |
| unsigned long addr; |
| ssize_t count; |
| int result; |
| struct iov_iter i; |
| struct iovec iov; |
| |
| LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); |
| |
| if (!cl_is_normalio(env, io)) |
| return 0; |
| |
| if (vio->cui_iter == NULL) /* nfs or loop back device write */ |
| return 0; |
| |
| /* No MM (e.g. NFS)? No vmas too. */ |
| if (mm == NULL) |
| return 0; |
| |
| iov_for_each(iov, i, *(vio->cui_iter)) { |
| addr = (unsigned long)iov.iov_base; |
| count = iov.iov_len; |
| if (count == 0) |
| continue; |
| |
| count += addr & (~CFS_PAGE_MASK); |
| addr &= CFS_PAGE_MASK; |
| |
| down_read(&mm->mmap_sem); |
| while ((vma = our_vma(mm, addr, count)) != NULL) { |
| struct inode *inode = file_inode(vma->vm_file); |
| int flags = CEF_MUST; |
| |
| if (ll_file_nolock(vma->vm_file)) { |
| /* |
| * For no lock case, a lockless lock will be |
| * generated. |
| */ |
| flags = CEF_NEVER; |
| } |
| |
| /* |
| * XXX: Required lock mode can be weakened: CIT_WRITE |
| * io only ever reads user level buffer, and CIT_READ |
| * only writes on it. |
| */ |
| policy_from_vma(&policy, vma, addr, count); |
| descr->cld_mode = vvp_mode_from_vma(vma); |
| descr->cld_obj = ll_i2info(inode)->lli_clob; |
| descr->cld_start = cl_index(descr->cld_obj, |
| policy.l_extent.start); |
| descr->cld_end = cl_index(descr->cld_obj, |
| policy.l_extent.end); |
| descr->cld_enq_flags = flags; |
| result = cl_io_lock_alloc_add(env, io, descr); |
| |
| CDEBUG(D_VFSTRACE, "lock: %d: [%lu, %lu]\n", |
| descr->cld_mode, descr->cld_start, |
| descr->cld_end); |
| |
| if (result < 0) { |
| up_read(&mm->mmap_sem); |
| return result; |
| } |
| |
| if (vma->vm_end - addr >= count) |
| break; |
| |
| count -= vma->vm_end - addr; |
| addr = vma->vm_end; |
| } |
| up_read(&mm->mmap_sem); |
| } |
| return 0; |
| } |
| |
| static int vvp_io_rw_lock(const struct lu_env *env, struct cl_io *io, |
| enum cl_lock_mode mode, loff_t start, loff_t end) |
| { |
| struct ccc_io *cio = ccc_env_io(env); |
| int result; |
| int ast_flags = 0; |
| |
| LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); |
| |
| ccc_io_update_iov(env, cio, io); |
| |
| if (io->u.ci_rw.crw_nonblock) |
| ast_flags |= CEF_NONBLOCK; |
| result = vvp_mmap_locks(env, cio, io); |
| if (result == 0) |
| result = ccc_io_one_lock(env, io, ast_flags, mode, start, end); |
| return result; |
| } |
| |
| static int vvp_io_read_lock(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct cl_io_rw_common *rd = &io->u.ci_rd.rd; |
| int result; |
| |
| result = vvp_io_rw_lock(env, io, CLM_READ, rd->crw_pos, |
| rd->crw_pos + rd->crw_count - 1); |
| |
| return result; |
| } |
| |
| static int vvp_io_fault_lock(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct vvp_io *vio = cl2vvp_io(env, ios); |
| /* |
| * XXX LDLM_FL_CBPENDING |
| */ |
| return ccc_io_one_lock_index |
| (env, io, 0, vvp_mode_from_vma(vio->u.fault.ft_vma), |
| io->u.ci_fault.ft_index, io->u.ci_fault.ft_index); |
| } |
| |
| static int vvp_io_write_lock(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| loff_t start; |
| loff_t end; |
| |
| if (io->u.ci_wr.wr_append) { |
| start = 0; |
| end = OBD_OBJECT_EOF; |
| } else { |
| start = io->u.ci_wr.wr.crw_pos; |
| end = start + io->u.ci_wr.wr.crw_count - 1; |
| } |
| return vvp_io_rw_lock(env, io, CLM_WRITE, start, end); |
| } |
| |
| static int vvp_io_setattr_iter_init(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| return 0; |
| } |
| |
| /** |
| * Implementation of cl_io_operations::cio_lock() method for CIT_SETATTR io. |
| * |
| * Handles "lockless io" mode when extent locking is done by server. |
| */ |
| static int vvp_io_setattr_lock(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct ccc_io *cio = ccc_env_io(env); |
| struct cl_io *io = ios->cis_io; |
| __u64 new_size; |
| __u32 enqflags = 0; |
| |
| if (cl_io_is_trunc(io)) { |
| new_size = io->u.ci_setattr.sa_attr.lvb_size; |
| if (new_size == 0) |
| enqflags = CEF_DISCARD_DATA; |
| } else { |
| if ((io->u.ci_setattr.sa_attr.lvb_mtime >= |
| io->u.ci_setattr.sa_attr.lvb_ctime) || |
| (io->u.ci_setattr.sa_attr.lvb_atime >= |
| io->u.ci_setattr.sa_attr.lvb_ctime)) |
| return 0; |
| new_size = 0; |
| } |
| cio->u.setattr.cui_local_lock = SETATTR_EXTENT_LOCK; |
| return ccc_io_one_lock(env, io, enqflags, CLM_WRITE, |
| new_size, OBD_OBJECT_EOF); |
| } |
| |
| static int vvp_do_vmtruncate(struct inode *inode, size_t size) |
| { |
| int result; |
| /* |
| * Only ll_inode_size_lock is taken at this level. |
| */ |
| ll_inode_size_lock(inode); |
| result = inode_newsize_ok(inode, size); |
| if (result < 0) { |
| ll_inode_size_unlock(inode); |
| return result; |
| } |
| truncate_setsize(inode, size); |
| ll_inode_size_unlock(inode); |
| return result; |
| } |
| |
| static int vvp_io_setattr_trunc(const struct lu_env *env, |
| const struct cl_io_slice *ios, |
| struct inode *inode, loff_t size) |
| { |
| inode_dio_wait(inode); |
| return 0; |
| } |
| |
| static int vvp_io_setattr_time(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct cl_object *obj = io->ci_obj; |
| struct cl_attr *attr = ccc_env_thread_attr(env); |
| int result; |
| unsigned valid = CAT_CTIME; |
| |
| cl_object_attr_lock(obj); |
| attr->cat_ctime = io->u.ci_setattr.sa_attr.lvb_ctime; |
| if (io->u.ci_setattr.sa_valid & ATTR_ATIME_SET) { |
| attr->cat_atime = io->u.ci_setattr.sa_attr.lvb_atime; |
| valid |= CAT_ATIME; |
| } |
| if (io->u.ci_setattr.sa_valid & ATTR_MTIME_SET) { |
| attr->cat_mtime = io->u.ci_setattr.sa_attr.lvb_mtime; |
| valid |= CAT_MTIME; |
| } |
| result = cl_object_attr_set(env, obj, attr, valid); |
| cl_object_attr_unlock(obj); |
| |
| return result; |
| } |
| |
| static int vvp_io_setattr_start(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct inode *inode = ccc_object_inode(io->ci_obj); |
| int result = 0; |
| |
| mutex_lock(&inode->i_mutex); |
| if (cl_io_is_trunc(io)) |
| result = vvp_io_setattr_trunc(env, ios, inode, |
| io->u.ci_setattr.sa_attr.lvb_size); |
| if (result == 0) |
| result = vvp_io_setattr_time(env, ios); |
| return result; |
| } |
| |
| static void vvp_io_setattr_end(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct inode *inode = ccc_object_inode(io->ci_obj); |
| |
| if (cl_io_is_trunc(io)) { |
| /* Truncate in memory pages - they must be clean pages |
| * because osc has already notified to destroy osc_extents. */ |
| vvp_do_vmtruncate(inode, io->u.ci_setattr.sa_attr.lvb_size); |
| inode_dio_write_done(inode); |
| } |
| mutex_unlock(&inode->i_mutex); |
| } |
| |
| static void vvp_io_setattr_fini(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| vvp_io_fini(env, ios); |
| } |
| |
| static int vvp_io_read_start(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct vvp_io *vio = cl2vvp_io(env, ios); |
| struct ccc_io *cio = cl2ccc_io(env, ios); |
| struct cl_io *io = ios->cis_io; |
| struct cl_object *obj = io->ci_obj; |
| struct inode *inode = ccc_object_inode(obj); |
| struct ll_ra_read *bead = &vio->cui_bead; |
| struct file *file = cio->cui_fd->fd_file; |
| |
| int result; |
| loff_t pos = io->u.ci_rd.rd.crw_pos; |
| long cnt = io->u.ci_rd.rd.crw_count; |
| long tot = cio->cui_tot_count; |
| int exceed = 0; |
| |
| CLOBINVRNT(env, obj, ccc_object_invariant(obj)); |
| |
| CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt); |
| |
| if (!can_populate_pages(env, io, inode)) |
| return 0; |
| |
| result = ccc_prep_size(env, obj, io, pos, tot, &exceed); |
| if (result != 0) |
| return result; |
| else if (exceed != 0) |
| goto out; |
| |
| LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, |
| "Read ino %lu, %lu bytes, offset %lld, size %llu\n", |
| inode->i_ino, cnt, pos, i_size_read(inode)); |
| |
| /* turn off the kernel's read-ahead */ |
| cio->cui_fd->fd_file->f_ra.ra_pages = 0; |
| |
| /* initialize read-ahead window once per syscall */ |
| if (!vio->cui_ra_window_set) { |
| vio->cui_ra_window_set = 1; |
| bead->lrr_start = cl_index(obj, pos); |
| /* |
| * XXX: explicit PAGE_CACHE_SIZE |
| */ |
| bead->lrr_count = cl_index(obj, tot + PAGE_CACHE_SIZE - 1); |
| ll_ra_read_in(file, bead); |
| } |
| |
| /* BUG: 5972 */ |
| file_accessed(file); |
| switch (vio->cui_io_subtype) { |
| case IO_NORMAL: |
| LASSERT(cio->cui_iocb->ki_pos == pos); |
| result = generic_file_read_iter(cio->cui_iocb, cio->cui_iter); |
| break; |
| case IO_SPLICE: |
| result = generic_file_splice_read(file, &pos, |
| vio->u.splice.cui_pipe, cnt, |
| vio->u.splice.cui_flags); |
| /* LU-1109: do splice read stripe by stripe otherwise if it |
| * may make nfsd stuck if this read occupied all internal pipe |
| * buffers. */ |
| io->ci_continue = 0; |
| break; |
| default: |
| CERROR("Wrong IO type %u\n", vio->cui_io_subtype); |
| LBUG(); |
| } |
| |
| out: |
| if (result >= 0) { |
| if (result < cnt) |
| io->ci_continue = 0; |
| io->ci_nob += result; |
| ll_rw_stats_tally(ll_i2sbi(inode), current->pid, |
| cio->cui_fd, pos, result, READ); |
| result = 0; |
| } |
| return result; |
| } |
| |
| static void vvp_io_read_fini(const struct lu_env *env, const struct cl_io_slice *ios) |
| { |
| struct vvp_io *vio = cl2vvp_io(env, ios); |
| struct ccc_io *cio = cl2ccc_io(env, ios); |
| |
| if (vio->cui_ra_window_set) |
| ll_ra_read_ex(cio->cui_fd->fd_file, &vio->cui_bead); |
| |
| vvp_io_fini(env, ios); |
| } |
| |
| static int vvp_io_write_start(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct ccc_io *cio = cl2ccc_io(env, ios); |
| struct cl_io *io = ios->cis_io; |
| struct cl_object *obj = io->ci_obj; |
| struct inode *inode = ccc_object_inode(obj); |
| ssize_t result = 0; |
| loff_t pos = io->u.ci_wr.wr.crw_pos; |
| size_t cnt = io->u.ci_wr.wr.crw_count; |
| |
| if (!can_populate_pages(env, io, inode)) |
| return 0; |
| |
| if (cl_io_is_append(io)) { |
| /* |
| * PARALLEL IO This has to be changed for parallel IO doing |
| * out-of-order writes. |
| */ |
| pos = io->u.ci_wr.wr.crw_pos = i_size_read(inode); |
| cio->cui_iocb->ki_pos = pos; |
| } else { |
| LASSERT(cio->cui_iocb->ki_pos == pos); |
| } |
| |
| CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt); |
| |
| if (cio->cui_iter == NULL) /* from a temp io in ll_cl_init(). */ |
| result = 0; |
| else |
| result = generic_file_write_iter(cio->cui_iocb, cio->cui_iter); |
| |
| if (result > 0) { |
| if (result < cnt) |
| io->ci_continue = 0; |
| io->ci_nob += result; |
| ll_rw_stats_tally(ll_i2sbi(inode), current->pid, |
| cio->cui_fd, pos, result, WRITE); |
| result = 0; |
| } |
| return result; |
| } |
| |
| static int vvp_io_kernel_fault(struct vvp_fault_io *cfio) |
| { |
| struct vm_fault *vmf = cfio->fault.ft_vmf; |
| |
| cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, vmf); |
| cfio->fault.ft_flags_valid = 1; |
| |
| if (vmf->page) { |
| CDEBUG(D_PAGE, |
| "page %p map %p index %lu flags %lx count %u priv %0lx: got addr %p type NOPAGE\n", |
| vmf->page, vmf->page->mapping, vmf->page->index, |
| (long)vmf->page->flags, page_count(vmf->page), |
| page_private(vmf->page), vmf->virtual_address); |
| if (unlikely(!(cfio->fault.ft_flags & VM_FAULT_LOCKED))) { |
| lock_page(vmf->page); |
| cfio->fault.ft_flags |= VM_FAULT_LOCKED; |
| } |
| |
| cfio->ft_vmpage = vmf->page; |
| return 0; |
| } |
| |
| if (cfio->fault.ft_flags & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) { |
| CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", vmf->virtual_address); |
| return -EFAULT; |
| } |
| |
| if (cfio->fault.ft_flags & VM_FAULT_OOM) { |
| CDEBUG(D_PAGE, "got addr %p - OOM\n", vmf->virtual_address); |
| return -ENOMEM; |
| } |
| |
| if (cfio->fault.ft_flags & VM_FAULT_RETRY) |
| return -EAGAIN; |
| |
| CERROR("Unknown error in page fault %d!\n", cfio->fault.ft_flags); |
| return -EINVAL; |
| } |
| |
| |
| static int vvp_io_fault_start(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| struct vvp_io *vio = cl2vvp_io(env, ios); |
| struct cl_io *io = ios->cis_io; |
| struct cl_object *obj = io->ci_obj; |
| struct inode *inode = ccc_object_inode(obj); |
| struct cl_fault_io *fio = &io->u.ci_fault; |
| struct vvp_fault_io *cfio = &vio->u.fault; |
| loff_t offset; |
| int result = 0; |
| struct page *vmpage = NULL; |
| struct cl_page *page; |
| loff_t size; |
| pgoff_t last; /* last page in a file data region */ |
| |
| if (fio->ft_executable && |
| LTIME_S(inode->i_mtime) != vio->u.fault.ft_mtime) |
| CWARN("binary "DFID |
| " changed while waiting for the page fault lock\n", |
| PFID(lu_object_fid(&obj->co_lu))); |
| |
| /* offset of the last byte on the page */ |
| offset = cl_offset(obj, fio->ft_index + 1) - 1; |
| LASSERT(cl_index(obj, offset) == fio->ft_index); |
| result = ccc_prep_size(env, obj, io, 0, offset + 1, NULL); |
| if (result != 0) |
| return result; |
| |
| /* must return locked page */ |
| if (fio->ft_mkwrite) { |
| LASSERT(cfio->ft_vmpage != NULL); |
| lock_page(cfio->ft_vmpage); |
| } else { |
| result = vvp_io_kernel_fault(cfio); |
| if (result != 0) |
| return result; |
| } |
| |
| vmpage = cfio->ft_vmpage; |
| LASSERT(PageLocked(vmpage)); |
| |
| if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_FAULT_TRUNC_RACE)) |
| ll_invalidate_page(vmpage); |
| |
| size = i_size_read(inode); |
| /* Though we have already held a cl_lock upon this page, but |
| * it still can be truncated locally. */ |
| if (unlikely((vmpage->mapping != inode->i_mapping) || |
| (page_offset(vmpage) > size))) { |
| CDEBUG(D_PAGE, "llite: fault and truncate race happened!\n"); |
| |
| /* return +1 to stop cl_io_loop() and ll_fault() will catch |
| * and retry. */ |
| result = +1; |
| goto out; |
| } |
| |
| |
| if (fio->ft_mkwrite) { |
| pgoff_t last_index; |
| /* |
| * Capture the size while holding the lli_trunc_sem from above |
| * we want to make sure that we complete the mkwrite action |
| * while holding this lock. We need to make sure that we are |
| * not past the end of the file. |
| */ |
| last_index = cl_index(obj, size - 1); |
| if (last_index < fio->ft_index) { |
| CDEBUG(D_PAGE, |
| "llite: mkwrite and truncate race happened: %p: 0x%lx 0x%lx\n", |
| vmpage->mapping, fio->ft_index, last_index); |
| /* |
| * We need to return if we are |
| * passed the end of the file. This will propagate |
| * up the call stack to ll_page_mkwrite where |
| * we will return VM_FAULT_NOPAGE. Any non-negative |
| * value returned here will be silently |
| * converted to 0. If the vmpage->mapping is null |
| * the error code would be converted back to ENODATA |
| * in ll_page_mkwrite0. Thus we return -ENODATA |
| * to handle both cases |
| */ |
| result = -ENODATA; |
| goto out; |
| } |
| } |
| |
| page = cl_page_find(env, obj, fio->ft_index, vmpage, CPT_CACHEABLE); |
| if (IS_ERR(page)) { |
| result = PTR_ERR(page); |
| goto out; |
| } |
| |
| /* if page is going to be written, we should add this page into cache |
| * earlier. */ |
| if (fio->ft_mkwrite) { |
| wait_on_page_writeback(vmpage); |
| if (set_page_dirty(vmpage)) { |
| struct ccc_page *cp; |
| |
| /* vvp_page_assume() calls wait_on_page_writeback(). */ |
| cl_page_assume(env, io, page); |
| |
| cp = cl2ccc_page(cl_page_at(page, &vvp_device_type)); |
| vvp_write_pending(cl2ccc(obj), cp); |
| |
| /* Do not set Dirty bit here so that in case IO is |
| * started before the page is really made dirty, we |
| * still have chance to detect it. */ |
| result = cl_page_cache_add(env, io, page, CRT_WRITE); |
| LASSERT(cl_page_is_owned(page, io)); |
| |
| vmpage = NULL; |
| if (result < 0) { |
| cl_page_unmap(env, io, page); |
| cl_page_discard(env, io, page); |
| cl_page_disown(env, io, page); |
| |
| cl_page_put(env, page); |
| |
| /* we're in big trouble, what can we do now? */ |
| if (result == -EDQUOT) |
| result = -ENOSPC; |
| goto out; |
| } else |
| cl_page_disown(env, io, page); |
| } |
| } |
| |
| last = cl_index(obj, size - 1); |
| /* |
| * The ft_index is only used in the case of |
| * a mkwrite action. We need to check |
| * our assertions are correct, since |
| * we should have caught this above |
| */ |
| LASSERT(!fio->ft_mkwrite || fio->ft_index <= last); |
| if (fio->ft_index == last) |
| /* |
| * Last page is mapped partially. |
| */ |
| fio->ft_nob = size - cl_offset(obj, fio->ft_index); |
| else |
| fio->ft_nob = cl_page_size(obj); |
| |
| lu_ref_add(&page->cp_reference, "fault", io); |
| fio->ft_page = page; |
| |
| out: |
| /* return unlocked vmpage to avoid deadlocking */ |
| if (vmpage != NULL) |
| unlock_page(vmpage); |
| cfio->fault.ft_flags &= ~VM_FAULT_LOCKED; |
| return result; |
| } |
| |
| static int vvp_io_fsync_start(const struct lu_env *env, |
| const struct cl_io_slice *ios) |
| { |
| /* we should mark TOWRITE bit to each dirty page in radix tree to |
| * verify pages have been written, but this is difficult because of |
| * race. */ |
| return 0; |
| } |
| |
| static int vvp_io_read_page(const struct lu_env *env, |
| const struct cl_io_slice *ios, |
| const struct cl_page_slice *slice) |
| { |
| struct cl_io *io = ios->cis_io; |
| struct cl_object *obj = slice->cpl_obj; |
| struct ccc_page *cp = cl2ccc_page(slice); |
| struct cl_page *page = slice->cpl_page; |
| struct inode *inode = ccc_object_inode(obj); |
| struct ll_sb_info *sbi = ll_i2sbi(inode); |
| struct ll_file_data *fd = cl2ccc_io(env, ios)->cui_fd; |
| struct ll_readahead_state *ras = &fd->fd_ras; |
| struct page *vmpage = cp->cpg_page; |
| struct cl_2queue *queue = &io->ci_queue; |
| int rc; |
| |
| CLOBINVRNT(env, obj, ccc_object_invariant(obj)); |
| LASSERT(slice->cpl_obj == obj); |
| |
| if (sbi->ll_ra_info.ra_max_pages_per_file && |
| sbi->ll_ra_info.ra_max_pages) |
| ras_update(sbi, inode, ras, page->cp_index, |
| cp->cpg_defer_uptodate); |
| |
| /* Sanity check whether the page is protected by a lock. */ |
| rc = cl_page_is_under_lock(env, io, page); |
| if (rc != -EBUSY) { |
| CL_PAGE_HEADER(D_WARNING, env, page, "%s: %d\n", |
| rc == -ENODATA ? "without a lock" : |
| "match failed", rc); |
| if (rc != -ENODATA) |
| return rc; |
| } |
| |
| if (cp->cpg_defer_uptodate) { |
| cp->cpg_ra_used = 1; |
| cl_page_export(env, page, 1); |
| } |
| /* |
| * Add page into the queue even when it is marked uptodate above. |
| * this will unlock it automatically as part of cl_page_list_disown(). |
| */ |
| cl_2queue_add(queue, page); |
| if (sbi->ll_ra_info.ra_max_pages_per_file && |
| sbi->ll_ra_info.ra_max_pages) |
| ll_readahead(env, io, ras, |
| vmpage->mapping, &queue->c2_qin, fd->fd_flags); |
| |
| return 0; |
| } |
| |
| static int vvp_page_sync_io(const struct lu_env *env, struct cl_io *io, |
| struct cl_page *page, struct ccc_page *cp, |
| enum cl_req_type crt) |
| { |
| struct cl_2queue *queue; |
| int result; |
| |
| LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); |
| |
| queue = &io->ci_queue; |
| cl_2queue_init_page(queue, page); |
| |
| result = cl_io_submit_sync(env, io, crt, queue, 0); |
| LASSERT(cl_page_is_owned(page, io)); |
| |
| if (crt == CRT_READ) |
| /* |
| * in CRT_WRITE case page is left locked even in case of |
| * error. |
| */ |
| cl_page_list_disown(env, io, &queue->c2_qin); |
| cl_2queue_fini(env, queue); |
| |
| return result; |
| } |
| |
| /** |
| * Prepare partially written-to page for a write. |
| */ |
| static int vvp_io_prepare_partial(const struct lu_env *env, struct cl_io *io, |
| struct cl_object *obj, struct cl_page *pg, |
| struct ccc_page *cp, |
| unsigned from, unsigned to) |
| { |
| struct cl_attr *attr = ccc_env_thread_attr(env); |
| loff_t offset = cl_offset(obj, pg->cp_index); |
| int result; |
| |
| cl_object_attr_lock(obj); |
| result = cl_object_attr_get(env, obj, attr); |
| cl_object_attr_unlock(obj); |
| if (result == 0) { |
| /* |
| * If are writing to a new page, no need to read old data. |
| * The extent locking will have updated the KMS, and for our |
| * purposes here we can treat it like i_size. |
| */ |
| if (attr->cat_kms <= offset) { |
| char *kaddr = kmap_atomic(cp->cpg_page); |
| |
| memset(kaddr, 0, cl_page_size(obj)); |
| kunmap_atomic(kaddr); |
| } else if (cp->cpg_defer_uptodate) |
| cp->cpg_ra_used = 1; |
| else |
| result = vvp_page_sync_io(env, io, pg, cp, CRT_READ); |
| /* |
| * In older implementations, obdo_refresh_inode is called here |
| * to update the inode because the write might modify the |
| * object info at OST. However, this has been proven useless, |
| * since LVB functions will be called when user space program |
| * tries to retrieve inode attribute. Also, see bug 15909 for |
| * details. -jay |
| */ |
| if (result == 0) |
| cl_page_export(env, pg, 1); |
| } |
| return result; |
| } |
| |
| static int vvp_io_prepare_write(const struct lu_env *env, |
| const struct cl_io_slice *ios, |
| const struct cl_page_slice *slice, |
| unsigned from, unsigned to) |
| { |
| struct cl_object *obj = slice->cpl_obj; |
| struct ccc_page *cp = cl2ccc_page(slice); |
| struct cl_page *pg = slice->cpl_page; |
| struct page *vmpage = cp->cpg_page; |
| |
| int result; |
| |
| LINVRNT(cl_page_is_vmlocked(env, pg)); |
| LASSERT(vmpage->mapping->host == ccc_object_inode(obj)); |
| |
| result = 0; |
| |
| CL_PAGE_HEADER(D_PAGE, env, pg, "preparing: [%d, %d]\n", from, to); |
| if (!PageUptodate(vmpage)) { |
| /* |
| * We're completely overwriting an existing page, so _don't_ |
| * set it up to date until commit_write |
| */ |
| if (from == 0 && to == PAGE_CACHE_SIZE) { |
| CL_PAGE_HEADER(D_PAGE, env, pg, "full page write\n"); |
| POISON_PAGE(page, 0x11); |
| } else |
| result = vvp_io_prepare_partial(env, ios->cis_io, obj, |
| pg, cp, from, to); |
| } else |
| CL_PAGE_HEADER(D_PAGE, env, pg, "uptodate\n"); |
| return result; |
| } |
| |
| static int vvp_io_commit_write(const struct lu_env *env, |
| const struct cl_io_slice *ios, |
| const struct cl_page_slice *slice, |
| unsigned from, unsigned to) |
| { |
| struct cl_object *obj = slice->cpl_obj; |
| struct cl_io *io = ios->cis_io; |
| struct ccc_page *cp = cl2ccc_page(slice); |
| struct cl_page *pg = slice->cpl_page; |
| struct inode *inode = ccc_object_inode(obj); |
| struct ll_sb_info *sbi = ll_i2sbi(inode); |
| struct ll_inode_info *lli = ll_i2info(inode); |
| struct page *vmpage = cp->cpg_page; |
| |
| int result; |
| int tallyop; |
| loff_t size; |
| |
| LINVRNT(cl_page_is_vmlocked(env, pg)); |
| LASSERT(vmpage->mapping->host == inode); |
| |
| LU_OBJECT_HEADER(D_INODE, env, &obj->co_lu, "committing page write\n"); |
| CL_PAGE_HEADER(D_PAGE, env, pg, "committing: [%d, %d]\n", from, to); |
| |
| /* |
| * queue a write for some time in the future the first time we |
| * dirty the page. |
| * |
| * This is different from what other file systems do: they usually |
| * just mark page (and some of its buffers) dirty and rely on |
| * balance_dirty_pages() to start a write-back. Lustre wants write-back |
| * to be started earlier for the following reasons: |
| * |
| * (1) with a large number of clients we need to limit the amount |
| * of cached data on the clients a lot; |
| * |
| * (2) large compute jobs generally want compute-only then io-only |
| * and the IO should complete as quickly as possible; |
| * |
| * (3) IO is batched up to the RPC size and is async until the |
| * client max cache is hit |
| * (/proc/fs/lustre/osc/OSC.../max_dirty_mb) |
| * |
| */ |
| if (!PageDirty(vmpage)) { |
| tallyop = LPROC_LL_DIRTY_MISSES; |
| result = cl_page_cache_add(env, io, pg, CRT_WRITE); |
| if (result == 0) { |
| /* page was added into cache successfully. */ |
| set_page_dirty(vmpage); |
| vvp_write_pending(cl2ccc(obj), cp); |
| } else if (result == -EDQUOT) { |
| pgoff_t last_index = i_size_read(inode) >> PAGE_CACHE_SHIFT; |
| bool need_clip = true; |
| |
| /* |
| * Client ran out of disk space grant. Possible |
| * strategies are: |
| * |
| * (a) do a sync write, renewing grant; |
| * |
| * (b) stop writing on this stripe, switch to the |
| * next one. |
| * |
| * (b) is a part of "parallel io" design that is the |
| * ultimate goal. (a) is what "old" client did, and |
| * what the new code continues to do for the time |
| * being. |
| */ |
| if (last_index > pg->cp_index) { |
| to = PAGE_CACHE_SIZE; |
| need_clip = false; |
| } else if (last_index == pg->cp_index) { |
| int size_to = i_size_read(inode) & ~CFS_PAGE_MASK; |
| if (to < size_to) |
| to = size_to; |
| } |
| if (need_clip) |
| cl_page_clip(env, pg, 0, to); |
| result = vvp_page_sync_io(env, io, pg, cp, CRT_WRITE); |
| if (result) |
| CERROR("Write page %lu of inode %p failed %d\n", |
| pg->cp_index, inode, result); |
| } |
| } else { |
| tallyop = LPROC_LL_DIRTY_HITS; |
| result = 0; |
| } |
| ll_stats_ops_tally(sbi, tallyop, 1); |
| |
| /* Inode should be marked DIRTY even if no new page was marked DIRTY |
| * because page could have been not flushed between 2 modifications. |
| * It is important the file is marked DIRTY as soon as the I/O is done |
| * Indeed, when cache is flushed, file could be already closed and it |
| * is too late to warn the MDT. |
| * It is acceptable that file is marked DIRTY even if I/O is dropped |
| * for some reasons before being flushed to OST. |
| */ |
| if (result == 0) { |
| spin_lock(&lli->lli_lock); |
| lli->lli_flags |= LLIF_DATA_MODIFIED; |
| spin_unlock(&lli->lli_lock); |
| } |
| |
| size = cl_offset(obj, pg->cp_index) + to; |
| |
| ll_inode_size_lock(inode); |
| if (result == 0) { |
| if (size > i_size_read(inode)) { |
| cl_isize_write_nolock(inode, size); |
| CDEBUG(D_VFSTRACE, DFID" updating i_size %lu\n", |
| PFID(lu_object_fid(&obj->co_lu)), |
| (unsigned long)size); |
| } |
| cl_page_export(env, pg, 1); |
| } else { |
| if (size > i_size_read(inode)) |
| cl_page_discard(env, io, pg); |
| } |
| ll_inode_size_unlock(inode); |
| return result; |
| } |
| |
| static const struct cl_io_operations vvp_io_ops = { |
| .op = { |
| [CIT_READ] = { |
| .cio_fini = vvp_io_read_fini, |
| .cio_lock = vvp_io_read_lock, |
| .cio_start = vvp_io_read_start, |
| .cio_advance = ccc_io_advance |
| }, |
| [CIT_WRITE] = { |
| .cio_fini = vvp_io_fini, |
| .cio_lock = vvp_io_write_lock, |
| .cio_start = vvp_io_write_start, |
| .cio_advance = ccc_io_advance |
| }, |
| [CIT_SETATTR] = { |
| .cio_fini = vvp_io_setattr_fini, |
| .cio_iter_init = vvp_io_setattr_iter_init, |
| .cio_lock = vvp_io_setattr_lock, |
| .cio_start = vvp_io_setattr_start, |
| .cio_end = vvp_io_setattr_end |
| }, |
| [CIT_FAULT] = { |
| .cio_fini = vvp_io_fault_fini, |
| .cio_iter_init = vvp_io_fault_iter_init, |
| .cio_lock = vvp_io_fault_lock, |
| .cio_start = vvp_io_fault_start, |
| .cio_end = ccc_io_end |
| }, |
| [CIT_FSYNC] = { |
| .cio_start = vvp_io_fsync_start, |
| .cio_fini = vvp_io_fini |
| }, |
| [CIT_MISC] = { |
| .cio_fini = vvp_io_fini |
| } |
| }, |
| .cio_read_page = vvp_io_read_page, |
| .cio_prepare_write = vvp_io_prepare_write, |
| .cio_commit_write = vvp_io_commit_write |
| }; |
| |
| int vvp_io_init(const struct lu_env *env, struct cl_object *obj, |
| struct cl_io *io) |
| { |
| struct vvp_io *vio = vvp_env_io(env); |
| struct ccc_io *cio = ccc_env_io(env); |
| struct inode *inode = ccc_object_inode(obj); |
| int result; |
| |
| CLOBINVRNT(env, obj, ccc_object_invariant(obj)); |
| |
| CDEBUG(D_VFSTRACE, DFID |
| " ignore/verify layout %d/%d, layout version %d restore needed %d\n", |
| PFID(lu_object_fid(&obj->co_lu)), |
| io->ci_ignore_layout, io->ci_verify_layout, |
| cio->cui_layout_gen, io->ci_restore_needed); |
| |
| CL_IO_SLICE_CLEAN(cio, cui_cl); |
| cl_io_slice_add(io, &cio->cui_cl, obj, &vvp_io_ops); |
| vio->cui_ra_window_set = 0; |
| result = 0; |
| if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE) { |
| size_t count; |
| struct ll_inode_info *lli = ll_i2info(inode); |
| |
| count = io->u.ci_rw.crw_count; |
| /* "If nbyte is 0, read() will return 0 and have no other |
| * results." -- Single Unix Spec */ |
| if (count == 0) |
| result = 1; |
| else |
| cio->cui_tot_count = count; |
| |
| /* for read/write, we store the jobid in the inode, and |
| * it'll be fetched by osc when building RPC. |
| * |
| * it's not accurate if the file is shared by different |
| * jobs. |
| */ |
| lustre_get_jobid(lli->lli_jobid); |
| } else if (io->ci_type == CIT_SETATTR) { |
| if (!cl_io_is_trunc(io)) |
| io->ci_lockreq = CILR_MANDATORY; |
| } |
| |
| /* ignore layout change for generic CIT_MISC but not for glimpse. |
| * io context for glimpse must set ci_verify_layout to true, |
| * see cl_glimpse_size0() for details. */ |
| if (io->ci_type == CIT_MISC && !io->ci_verify_layout) |
| io->ci_ignore_layout = 1; |
| |
| /* Enqueue layout lock and get layout version. We need to do this |
| * even for operations requiring to open file, such as read and write, |
| * because it might not grant layout lock in IT_OPEN. */ |
| if (result == 0 && !io->ci_ignore_layout) { |
| result = ll_layout_refresh(inode, &cio->cui_layout_gen); |
| if (result == -ENOENT) |
| /* If the inode on MDS has been removed, but the objects |
| * on OSTs haven't been destroyed (async unlink), layout |
| * fetch will return -ENOENT, we'd ignore this error |
| * and continue with dirty flush. LU-3230. */ |
| result = 0; |
| if (result < 0) |
| CERROR("%s: refresh file layout " DFID " error %d.\n", |
| ll_get_fsname(inode->i_sb, NULL, 0), |
| PFID(lu_object_fid(&obj->co_lu)), result); |
| } |
| |
| return result; |
| } |
| |
| static struct vvp_io *cl2vvp_io(const struct lu_env *env, |
| const struct cl_io_slice *slice) |
| { |
| /* Calling just for assertion */ |
| cl2ccc_io(env, slice); |
| return vvp_env_io(env); |
| } |