diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/vvp_io.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/vvp_io.c | 1374 |
1 files changed, 0 insertions, 1374 deletions
diff --git a/drivers/staging/lustre/lustre/llite/vvp_io.c b/drivers/staging/lustre/lustre/llite/vvp_io.c deleted file mode 100644 index e7a4778e02e4..000000000000 --- a/drivers/staging/lustre/lustre/llite/vvp_io.c +++ /dev/null @@ -1,1374 +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) 2008, 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. - * - * 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 <obd.h> - -#include "llite_internal.h" -#include "vvp_internal.h" - -static struct vvp_io *cl2vvp_io(const struct lu_env *env, - const struct cl_io_slice *slice) -{ - struct vvp_io *vio; - - vio = container_of(slice, struct vvp_io, vui_cl); - LASSERT(vio == vvp_env_io(env)); - - return vio; -} - -/** - * 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 vvp_io *vio = vvp_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) != vio->vui_layout_gen || - OBD_FAIL_CHECK_RESET(OBD_FAIL_LLITE_LOST_LAYOUT, 0)) { - io->ci_need_restart = 1; - /* this will cause 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; -} - -static void vvp_object_size_lock(struct cl_object *obj) -{ - struct inode *inode = vvp_object_inode(obj); - - ll_inode_size_lock(inode); - cl_object_attr_lock(obj); -} - -static void vvp_object_size_unlock(struct cl_object *obj) -{ - struct inode *inode = vvp_object_inode(obj); - - cl_object_attr_unlock(obj); - ll_inode_size_unlock(inode); -} - -/** - * Helper function that if necessary adjusts file size (inode->i_size), when - * position at the offset \a pos is accessed. File size can be arbitrary stale - * on a Lustre client, but client at least knows KMS. If accessed area is - * inside [0, KMS], set file size to KMS, otherwise glimpse file size. - * - * Locking: cl_isize_lock is used to serialize changes to inode size and to - * protect consistency between inode size and cl_object - * attributes. cl_object_size_lock() protects consistency between cl_attr's of - * top-object and sub-objects. - */ -static int vvp_prep_size(const struct lu_env *env, struct cl_object *obj, - struct cl_io *io, loff_t start, size_t count, - int *exceed) -{ - struct cl_attr *attr = vvp_env_thread_attr(env); - struct inode *inode = vvp_object_inode(obj); - loff_t pos = start + count - 1; - loff_t kms; - int result; - - /* - * Consistency guarantees: following possibilities exist for the - * relation between region being accessed and real file size at this - * moment: - * - * (A): the region is completely inside of the file; - * - * (B-x): x bytes of region are inside of the file, the rest is - * outside; - * - * (C): the region is completely outside of the file. - * - * This classification is stable under DLM lock already acquired by - * the caller, because to change the class, other client has to take - * DLM lock conflicting with our lock. Also, any updates to ->i_size - * by other threads on this client are serialized by - * ll_inode_size_lock(). This guarantees that short reads are handled - * correctly in the face of concurrent writes and truncates. - */ - vvp_object_size_lock(obj); - result = cl_object_attr_get(env, obj, attr); - if (result == 0) { - kms = attr->cat_kms; - if (pos > kms) { - /* - * A glimpse is necessary to determine whether we - * return a short read (B) or some zeroes at the end - * of the buffer (C) - */ - vvp_object_size_unlock(obj); - result = cl_glimpse_lock(env, io, inode, obj, 0); - if (result == 0 && exceed) { - /* If objective page index exceed end-of-file - * page index, return directly. Do not expect - * kernel will check such case correctly. - * linux-2.6.18-128.1.1 miss to do that. - * --bug 17336 - */ - loff_t size = i_size_read(inode); - loff_t cur_index = start >> PAGE_SHIFT; - loff_t size_index = (size - 1) >> PAGE_SHIFT; - - if ((size == 0 && cur_index != 0) || - size_index < cur_index) - *exceed = 1; - } - return result; - } - /* - * region is within kms and, hence, within real file - * size (A). We need to increase i_size to cover the - * read region so that generic_file_read() will do its - * job, but that doesn't mean the kms size is - * _correct_, it is only the _minimum_ size. If - * someone does a stat they will get the correct size - * which will always be >= the kms value here. - * b=11081 - */ - if (i_size_read(inode) < kms) { - i_size_write(inode, kms); - CDEBUG(D_VFSTRACE, DFID " updating i_size %llu\n", - PFID(lu_object_fid(&obj->co_lu)), - (__u64)i_size_read(inode)); - } - } - - vvp_object_size_unlock(obj); - - return result; -} - -/***************************************************************************** - * - * io operations. - * - */ - -static int vvp_io_one_lock_index(const struct lu_env *env, struct cl_io *io, - __u32 enqflags, enum cl_lock_mode mode, - pgoff_t start, pgoff_t end) -{ - struct vvp_io *vio = vvp_env_io(env); - struct cl_lock_descr *descr = &vio->vui_link.cill_descr; - struct cl_object *obj = io->ci_obj; - - CLOBINVRNT(env, obj, vvp_object_invariant(obj)); - - CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end); - - memset(&vio->vui_link, 0, sizeof(vio->vui_link)); - - if (vio->vui_fd && (vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) { - descr->cld_mode = CLM_GROUP; - descr->cld_gid = vio->vui_fd->fd_grouplock.lg_gid; - enqflags |= CEF_LOCK_MATCH; - } else { - descr->cld_mode = mode; - } - descr->cld_obj = obj; - descr->cld_start = start; - descr->cld_end = end; - descr->cld_enq_flags = enqflags; - - cl_io_lock_add(env, io, &vio->vui_link); - return 0; -} - -static int vvp_io_one_lock(const struct lu_env *env, struct cl_io *io, - __u32 enqflags, enum cl_lock_mode mode, - loff_t start, loff_t end) -{ - struct cl_object *obj = io->ci_obj; - - return vvp_io_one_lock_index(env, io, enqflags, mode, - cl_index(obj, start), cl_index(obj, end)); -} - -static int vvp_io_write_iter_init(const struct lu_env *env, - const struct cl_io_slice *ios) -{ - struct vvp_io *vio = cl2vvp_io(env, ios); - - cl_page_list_init(&vio->u.write.vui_queue); - vio->u.write.vui_written = 0; - vio->u.write.vui_from = 0; - vio->u.write.vui_to = PAGE_SIZE; - - return 0; -} - -static void vvp_io_write_iter_fini(const struct lu_env *env, - const struct cl_io_slice *ios) -{ - struct vvp_io *vio = cl2vvp_io(env, ios); - - LASSERT(vio->u.write.vui_queue.pl_nr == 0); -} - -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 = vvp_object_inode(ios->cis_obj); - - LASSERT(inode == file_inode(vio->vui_fd->fd_file)); - vio->u.fault.ft_mtime = inode->i_mtime.tv_sec; - 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 vvp_io *vio = cl2vvp_io(env, ios); - struct inode *inode = vvp_object_inode(obj); - - CLOBINVRNT(env, obj, vvp_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, - vio->vui_layout_gen, io->ci_restore_needed); - - if (io->ci_restore_needed) { - int rc; - - /* file was detected release, we need to restore it - * before finishing the io - */ - rc = ll_layout_restore(inode, 0, OBD_OBJECT_EOF); - /* 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(inode, &gen); - io->ci_need_restart = vio->vui_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)), - vio->vui_layout_gen, gen); - /* today successful restore is the only possible case */ - /* restore was done, clear restoring state */ - clear_bit(LLIF_FILE_RESTORING, - &ll_i2info(inode)->lli_flags); - } - } -} - -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, vvp_object_invariant(io->ci_obj)); - - if (page) { - 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 vvp_io *vio, struct cl_io *io) -{ - struct vvp_thread_info *cti = vvp_env_info(env); - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - struct cl_lock_descr *descr = &cti->vti_descr; - union ldlm_policy_data policy; - unsigned long addr; - ssize_t count; - int result = 0; - struct iov_iter i; - struct iovec iov; - - LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); - - if (!vio->vui_iter) /* nfs or loop back device write */ - return 0; - - /* No MM (e.g. NFS)? No vmas too. */ - if (!mm) - return 0; - - iov_for_each(iov, i, *vio->vui_iter) { - addr = (unsigned long)iov.iov_base; - count = iov.iov_len; - if (count == 0) - continue; - - count += addr & (~PAGE_MASK); - addr &= 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 is not allowed for mmap - */ - result = -EINVAL; - break; - } - - /* - * 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) - break; - - if (vma->vm_end - addr >= count) - break; - - count -= vma->vm_end - addr; - addr = vma->vm_end; - } - up_read(&mm->mmap_sem); - if (result < 0) - break; - } - return result; -} - -static void vvp_io_advance(const struct lu_env *env, - const struct cl_io_slice *ios, - size_t nob) -{ - struct cl_object *obj = ios->cis_io->ci_obj; - struct vvp_io *vio = cl2vvp_io(env, ios); - - CLOBINVRNT(env, obj, vvp_object_invariant(obj)); - - vio->vui_tot_count -= nob; - iov_iter_reexpand(vio->vui_iter, vio->vui_tot_count); -} - -static void vvp_io_update_iov(const struct lu_env *env, - struct vvp_io *vio, struct cl_io *io) -{ - size_t size = io->u.ci_rw.crw_count; - - if (!vio->vui_iter) - return; - - iov_iter_truncate(vio->vui_iter, size); -} - -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 vvp_io *vio = vvp_env_io(env); - int result; - int ast_flags = 0; - - LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE); - - vvp_io_update_iov(env, vio, io); - - if (io->u.ci_rw.crw_nonblock) - ast_flags |= CEF_NONBLOCK; - result = vvp_mmap_locks(env, vio, io); - if (result == 0) - result = vvp_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 vvp_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::vio_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 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 { - unsigned int valid = io->u.ci_setattr.sa_valid; - - if (!(valid & TIMES_SET_FLAGS)) - return 0; - - if ((!(valid & ATTR_MTIME) || - io->u.ci_setattr.sa_attr.lvb_mtime >= - io->u.ci_setattr.sa_attr.lvb_ctime) && - (!(valid & ATTR_ATIME) || - io->u.ci_setattr.sa_attr.lvb_atime >= - io->u.ci_setattr.sa_attr.lvb_ctime)) - return 0; - new_size = 0; - } - - return vvp_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_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 = vvp_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_update(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 = vvp_object_inode(io->ci_obj); - struct ll_inode_info *lli = ll_i2info(inode); - - if (cl_io_is_trunc(io)) { - down_write(&lli->lli_trunc_sem); - inode_lock(inode); - inode_dio_wait(inode); - } else { - inode_lock(inode); - } - - if (io->u.ci_setattr.sa_valid & TIMES_SET_FLAGS) - return vvp_io_setattr_time(env, ios); - - return 0; -} - -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 = vvp_object_inode(io->ci_obj); - struct ll_inode_info *lli = ll_i2info(inode); - - 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_unlock(inode); - up_write(&lli->lli_trunc_sem); - } else { - inode_unlock(inode); - } -} - -static void vvp_io_setattr_fini(const struct lu_env *env, - const struct cl_io_slice *ios) -{ - bool restore_needed = ios->cis_io->ci_restore_needed; - struct inode *inode = vvp_object_inode(ios->cis_obj); - - vvp_io_fini(env, ios); - - if (restore_needed && !ios->cis_io->ci_restore_needed) { - /* restore finished, set data modified flag for HSM */ - set_bit(LLIF_DATA_MODIFIED, &(ll_i2info(inode))->lli_flags); - } -} - -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 cl_io *io = ios->cis_io; - struct cl_object *obj = io->ci_obj; - struct inode *inode = vvp_object_inode(obj); - struct ll_inode_info *lli = ll_i2info(inode); - struct file *file = vio->vui_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 = vio->vui_tot_count; - int exceed = 0; - - CLOBINVRNT(env, obj, vvp_object_invariant(obj)); - - CDEBUG(D_VFSTRACE, "read: -> [%lli, %lli)\n", pos, pos + cnt); - - down_read(&lli->lli_trunc_sem); - - if (!can_populate_pages(env, io, inode)) - return 0; - - result = vvp_prep_size(env, obj, io, pos, tot, &exceed); - if (result != 0) - return result; - 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 */ - vio->vui_fd->fd_file->f_ra.ra_pages = 0; - - /* initialize read-ahead window once per syscall */ - if (!vio->vui_ra_valid) { - vio->vui_ra_valid = true; - vio->vui_ra_start = cl_index(obj, pos); - vio->vui_ra_count = cl_index(obj, tot + PAGE_SIZE - 1); - ll_ras_enter(file); - } - - /* BUG: 5972 */ - file_accessed(file); - LASSERT(vio->vui_iocb->ki_pos == pos); - result = generic_file_read_iter(vio->vui_iocb, vio->vui_iter); - -out: - if (result >= 0) { - if (result < cnt) - io->ci_continue = 0; - io->ci_nob += result; - ll_rw_stats_tally(ll_i2sbi(inode), current->pid, - vio->vui_fd, pos, result, READ); - result = 0; - } - return result; -} - -static int vvp_io_commit_sync(const struct lu_env *env, struct cl_io *io, - struct cl_page_list *plist, int from, int to) -{ - struct cl_2queue *queue = &io->ci_queue; - struct cl_page *page; - unsigned int bytes = 0; - int rc = 0; - - if (plist->pl_nr == 0) - return 0; - - if (from > 0 || to != PAGE_SIZE) { - page = cl_page_list_first(plist); - if (plist->pl_nr == 1) { - cl_page_clip(env, page, from, to); - } else { - if (from > 0) - cl_page_clip(env, page, from, PAGE_SIZE); - if (to != PAGE_SIZE) { - page = cl_page_list_last(plist); - cl_page_clip(env, page, 0, to); - } - } - } - - cl_2queue_init(queue); - cl_page_list_splice(plist, &queue->c2_qin); - rc = cl_io_submit_sync(env, io, CRT_WRITE, queue, 0); - - /* plist is not sorted any more */ - cl_page_list_splice(&queue->c2_qin, plist); - cl_page_list_splice(&queue->c2_qout, plist); - cl_2queue_fini(env, queue); - - if (rc == 0) { - /* calculate bytes */ - bytes = plist->pl_nr << PAGE_SHIFT; - bytes -= from + PAGE_SIZE - to; - - while (plist->pl_nr > 0) { - page = cl_page_list_first(plist); - cl_page_list_del(env, plist, page); - - cl_page_clip(env, page, 0, PAGE_SIZE); - - SetPageUptodate(cl_page_vmpage(page)); - cl_page_disown(env, io, page); - - /* held in ll_cl_init() */ - lu_ref_del(&page->cp_reference, "cl_io", io); - cl_page_put(env, page); - } - } - - return bytes > 0 ? bytes : rc; -} - -static void write_commit_callback(const struct lu_env *env, struct cl_io *io, - struct cl_page *page) -{ - struct page *vmpage = page->cp_vmpage; - - SetPageUptodate(vmpage); - set_page_dirty(vmpage); - - cl_page_disown(env, io, page); - - /* held in ll_cl_init() */ - lu_ref_del(&page->cp_reference, "cl_io", cl_io_top(io)); - cl_page_put(env, page); -} - -/* make sure the page list is contiguous */ -static bool page_list_sanity_check(struct cl_object *obj, - struct cl_page_list *plist) -{ - struct cl_page *page; - pgoff_t index = CL_PAGE_EOF; - - cl_page_list_for_each(page, plist) { - struct vvp_page *vpg = cl_object_page_slice(obj, page); - - if (index == CL_PAGE_EOF) { - index = vvp_index(vpg); - continue; - } - - ++index; - if (index == vvp_index(vpg)) - continue; - - return false; - } - return true; -} - -/* Return how many bytes have queued or written */ -int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io) -{ - struct cl_object *obj = io->ci_obj; - struct inode *inode = vvp_object_inode(obj); - struct vvp_io *vio = vvp_env_io(env); - struct cl_page_list *queue = &vio->u.write.vui_queue; - struct cl_page *page; - int rc = 0; - int bytes = 0; - unsigned int npages = vio->u.write.vui_queue.pl_nr; - - if (npages == 0) - return 0; - - CDEBUG(D_VFSTRACE, "commit async pages: %d, from %d, to %d\n", - npages, vio->u.write.vui_from, vio->u.write.vui_to); - - LASSERT(page_list_sanity_check(obj, queue)); - - /* submit IO with async write */ - rc = cl_io_commit_async(env, io, queue, - vio->u.write.vui_from, vio->u.write.vui_to, - write_commit_callback); - npages -= queue->pl_nr; /* already committed pages */ - if (npages > 0) { - /* calculate how many bytes were written */ - bytes = npages << PAGE_SHIFT; - - /* first page */ - bytes -= vio->u.write.vui_from; - if (queue->pl_nr == 0) /* last page */ - bytes -= PAGE_SIZE - vio->u.write.vui_to; - LASSERTF(bytes > 0, "bytes = %d, pages = %d\n", bytes, npages); - - vio->u.write.vui_written += bytes; - - CDEBUG(D_VFSTRACE, "Committed %d pages %d bytes, tot: %ld\n", - npages, bytes, vio->u.write.vui_written); - - /* the first page must have been written. */ - vio->u.write.vui_from = 0; - } - LASSERT(page_list_sanity_check(obj, queue)); - LASSERT(ergo(rc == 0, queue->pl_nr == 0)); - - /* out of quota, try sync write */ - if (rc == -EDQUOT && !cl_io_is_mkwrite(io)) { - rc = vvp_io_commit_sync(env, io, queue, - vio->u.write.vui_from, - vio->u.write.vui_to); - if (rc > 0) { - vio->u.write.vui_written += rc; - rc = 0; - } - } - - /* update inode size */ - ll_merge_attr(env, inode); - - /* Now the pages in queue were failed to commit, discard them - * unless they were dirtied before. - */ - while (queue->pl_nr > 0) { - page = cl_page_list_first(queue); - cl_page_list_del(env, queue, page); - - if (!PageDirty(cl_page_vmpage(page))) - cl_page_discard(env, io, page); - - cl_page_disown(env, io, page); - - /* held in ll_cl_init() */ - lu_ref_del(&page->cp_reference, "cl_io", io); - cl_page_put(env, page); - } - cl_page_list_fini(env, queue); - - return rc; -} - -static int vvp_io_write_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 = vvp_object_inode(obj); - struct ll_inode_info *lli = ll_i2info(inode); - ssize_t result = 0; - loff_t pos = io->u.ci_wr.wr.crw_pos; - size_t cnt = io->u.ci_wr.wr.crw_count; - - down_read(&lli->lli_trunc_sem); - - 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. - */ - ll_merge_attr(env, inode); - pos = i_size_read(inode); - io->u.ci_wr.wr.crw_pos = pos; - vio->vui_iocb->ki_pos = pos; - } else { - LASSERT(vio->vui_iocb->ki_pos == pos); - } - - CDEBUG(D_VFSTRACE, "write: [%lli, %lli)\n", pos, pos + (long long)cnt); - - /* - * The maximum Lustre file size is variable, based on the OST maximum - * object size and number of stripes. This needs another check in - * addition to the VFS checks earlier. - */ - if (pos + cnt > ll_file_maxbytes(inode)) { - CDEBUG(D_INODE, - "%s: file " DFID " offset %llu > maxbytes %llu\n", - ll_get_fsname(inode->i_sb, NULL, 0), - PFID(ll_inode2fid(inode)), pos + cnt, - ll_file_maxbytes(inode)); - return -EFBIG; - } - - if (!vio->vui_iter) { - /* from a temp io in ll_cl_init(). */ - result = 0; - } else { - /* - * When using the locked AIO function (generic_file_aio_write()) - * testing has shown the inode mutex to be a limiting factor - * with multi-threaded single shared file performance. To get - * around this, we now use the lockless version. To maintain - * consistency, proper locking to protect against writes, - * trucates, etc. is handled in the higher layers of lustre. - */ - bool lock_node = !IS_NOSEC(inode); - - if (lock_node) - inode_lock(inode); - result = __generic_file_write_iter(vio->vui_iocb, - vio->vui_iter); - if (lock_node) - inode_unlock(inode); - - if (result > 0 || result == -EIOCBQUEUED) - result = generic_write_sync(vio->vui_iocb, result); - } - - if (result > 0) { - result = vvp_io_write_commit(env, io); - if (vio->u.write.vui_written > 0) { - result = vio->u.write.vui_written; - io->ci_nob += result; - - CDEBUG(D_VFSTRACE, "write: nob %zd, result: %zd\n", - io->ci_nob, result); - } - } - if (result > 0) { - set_bit(LLIF_DATA_MODIFIED, &(ll_i2info(inode))->lli_flags); - - if (result < cnt) - io->ci_continue = 0; - ll_rw_stats_tally(ll_i2sbi(inode), current->pid, - vio->vui_fd, pos, result, WRITE); - result = 0; - } - return result; -} - -static void vvp_io_rw_end(const struct lu_env *env, - const struct cl_io_slice *ios) -{ - struct inode *inode = vvp_object_inode(ios->cis_obj); - struct ll_inode_info *lli = ll_i2info(inode); - - up_read(&lli->lli_trunc_sem); -} - -static int vvp_io_kernel_fault(struct vvp_fault_io *cfio) -{ - struct vm_fault *vmf = cfio->ft_vmf; - - cfio->ft_flags = filemap_fault(vmf); - cfio->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), (void *)vmf->address); - if (unlikely(!(cfio->ft_flags & VM_FAULT_LOCKED))) { - lock_page(vmf->page); - cfio->ft_flags |= VM_FAULT_LOCKED; - } - - cfio->ft_vmpage = vmf->page; - return 0; - } - - if (cfio->ft_flags & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) { - CDEBUG(D_PAGE, "got addr %p - SIGBUS\n", (void *)vmf->address); - return -EFAULT; - } - - if (cfio->ft_flags & VM_FAULT_OOM) { - CDEBUG(D_PAGE, "got addr %p - OOM\n", (void *)vmf->address); - return -ENOMEM; - } - - if (cfio->ft_flags & VM_FAULT_RETRY) - return -EAGAIN; - - CERROR("Unknown error in page fault %d!\n", cfio->ft_flags); - return -EINVAL; -} - -static void mkwrite_commit_callback(const struct lu_env *env, struct cl_io *io, - struct cl_page *page) -{ - set_page_dirty(page->cp_vmpage); -} - -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 = vvp_object_inode(obj); - struct ll_inode_info *lli = ll_i2info(inode); - 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_index; - - down_read(&lli->lli_trunc_sem); - - /* 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 = vvp_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); - 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; - } - - last_index = cl_index(obj, size - 1); - - if (fio->ft_mkwrite) { - /* - * 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. - */ - 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 (!PageDirty(vmpage)) { - struct cl_page_list *plist = &io->ci_queue.c2_qin; - struct vvp_page *vpg = cl_object_page_slice(obj, page); - int to = PAGE_SIZE; - - /* vvp_page_assume() calls wait_on_page_writeback(). */ - cl_page_assume(env, io, page); - - cl_page_list_init(plist); - cl_page_list_add(plist, page); - - /* size fixup */ - if (last_index == vvp_index(vpg)) - to = size & ~PAGE_MASK; - - /* 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_io_commit_async(env, io, plist, 0, to, - mkwrite_commit_callback); - LASSERT(cl_page_is_owned(page, io)); - cl_page_list_fini(env, plist); - - vmpage = NULL; - if (result < 0) { - 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); - } - } - } - - /* - * 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_index); - if (fio->ft_index == last_index) - /* - * 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) - unlock_page(vmpage); - - cfio->ft_flags &= ~VM_FAULT_LOCKED; - - return result; -} - -static void vvp_io_fault_end(const struct lu_env *env, - const struct cl_io_slice *ios) -{ - struct inode *inode = vvp_object_inode(ios->cis_obj); - struct ll_inode_info *lli = ll_i2info(inode); - - CLOBINVRNT(env, ios->cis_io->ci_obj, - vvp_object_invariant(ios->cis_io->ci_obj)); - up_read(&lli->lli_trunc_sem); -} - -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_ahead(const struct lu_env *env, - const struct cl_io_slice *ios, - pgoff_t start, struct cl_read_ahead *ra) -{ - int result = 0; - - if (ios->cis_io->ci_type == CIT_READ || - ios->cis_io->ci_type == CIT_FAULT) { - struct vvp_io *vio = cl2vvp_io(env, ios); - - if (unlikely(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) { - ra->cra_end = CL_PAGE_EOF; - result = 1; /* no need to call down */ - } - } - - return result; -} - -static const struct cl_io_operations vvp_io_ops = { - .op = { - [CIT_READ] = { - .cio_fini = vvp_io_fini, - .cio_lock = vvp_io_read_lock, - .cio_start = vvp_io_read_start, - .cio_end = vvp_io_rw_end, - .cio_advance = vvp_io_advance, - }, - [CIT_WRITE] = { - .cio_fini = vvp_io_fini, - .cio_iter_init = vvp_io_write_iter_init, - .cio_iter_fini = vvp_io_write_iter_fini, - .cio_lock = vvp_io_write_lock, - .cio_start = vvp_io_write_start, - .cio_end = vvp_io_rw_end, - .cio_advance = vvp_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 = vvp_io_fault_end, - }, - [CIT_FSYNC] = { - .cio_start = vvp_io_fsync_start, - .cio_fini = vvp_io_fini - }, - [CIT_MISC] = { - .cio_fini = vvp_io_fini - } - }, - .cio_read_ahead = vvp_io_read_ahead, -}; - -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 inode *inode = vvp_object_inode(obj); - int result; - - CLOBINVRNT(env, obj, vvp_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, - vio->vui_layout_gen, io->ci_restore_needed); - - CL_IO_SLICE_CLEAN(vio, vui_cl); - cl_io_slice_add(io, &vio->vui_cl, obj, &vvp_io_ops); - vio->vui_ra_valid = false; - 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 - vio->vui_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; - } - - /* 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, &vio->vui_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; -} |