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24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * Implementation of cl_page for VVP layer.
33 * Author: Nikita Danilov <nikita.danilov@sun.com>
34 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
37 #define DEBUG_SUBSYSTEM S_LLITE
39 #include <linux/atomic.h>
40 #include <linux/bitops.h>
42 #include <linux/mutex.h>
43 #include <linux/page-flags.h>
44 #include <linux/pagemap.h>
46 #include <libcfs/libcfs.h>
47 #include "llite_internal.h"
48 #include "vvp_internal.h"
50 /*****************************************************************************
55 static void vvp_page_discard(const struct lu_env *env,
56 const struct cl_page_slice *slice,
59 struct cl_page *cp = slice->cpl_page;
60 struct page *vmpage = cp->cp_vmpage;
62 if (cp->cp_defer_uptodate && !cp->cp_ra_used && vmpage->mapping != NULL)
63 ll_ra_stats_inc(vmpage->mapping->host, RA_STAT_DISCARDED);
67 * Handles page transfer errors at VM level.
69 * This takes inode as a separate argument, because inode on which error is to
70 * be set can be different from \a vmpage inode in case of direct-io.
72 static void vvp_vmpage_error(struct inode *inode, struct page *vmpage,
75 struct vvp_object *obj = cl_inode2vvp(inode);
78 ClearPageError(vmpage);
79 obj->vob_discard_page_warned = 0;
83 set_bit(AS_ENOSPC, &inode->i_mapping->flags);
85 set_bit(AS_EIO, &inode->i_mapping->flags);
87 if ((ioret == -ESHUTDOWN || ioret == -EINTR ||
88 ioret == -EIO) && obj->vob_discard_page_warned == 0) {
89 obj->vob_discard_page_warned = 1;
90 ll_dirty_page_discard_warn(inode, ioret);
95 static void vvp_page_completion_read(const struct lu_env *env,
96 const struct cl_page_slice *slice,
99 struct cl_page *cp = slice->cpl_page;
100 struct page *vmpage = cp->cp_vmpage;
101 struct inode *inode = vvp_object_inode(cp->cp_obj);
104 LASSERT(PageLocked(vmpage));
105 CL_PAGE_HEADER(D_PAGE, env, cp, "completing READ with %d\n", ioret);
107 if (cp->cp_defer_uptodate)
108 ll_ra_count_put(ll_i2sbi(inode), 1);
112 * cp_defer_uptodate is used for readahead page, and the
113 * vmpage Uptodate bit is deferred to set in ll_readpage/
116 if (!cp->cp_defer_uptodate)
117 SetPageUptodate(vmpage);
118 } else if (cp->cp_defer_uptodate) {
119 cp->cp_defer_uptodate = 0;
120 if (ioret == -EAGAIN) {
121 /* mirror read failed, it needs to destroy the page
122 * because subpage would be from wrong osc when trying
123 * to read from a new mirror
125 generic_error_remove_page(vmpage->mapping, vmpage);
129 if (cp->cp_sync_io == NULL)
135 static void vvp_page_completion_write(const struct lu_env *env,
136 const struct cl_page_slice *slice,
139 struct cl_page *cp = slice->cpl_page;
140 struct page *vmpage = cp->cp_vmpage;
143 CL_PAGE_HEADER(D_PAGE, env, cp, "completing WRITE with %d\n", ioret);
145 if (cp->cp_sync_io != NULL) {
146 LASSERT(PageLocked(vmpage));
147 LASSERT(!PageWriteback(vmpage));
149 LASSERT(PageWriteback(vmpage));
151 * Only mark the page error only when it's an async write
152 * because applications won't wait for IO to finish.
154 vvp_vmpage_error(vvp_object_inode(cp->cp_obj), vmpage, ioret);
156 end_page_writeback(vmpage);
161 static const struct cl_page_operations vvp_page_ops = {
162 .cpo_discard = vvp_page_discard,
165 .cpo_completion = vvp_page_completion_read,
168 .cpo_completion = vvp_page_completion_write,
173 static const struct cl_page_operations vvp_transient_page_ops = {
176 int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
177 struct cl_page *page, pgoff_t index)
179 struct cl_page_slice *cpl = cl_object_page_slice(obj, page);
180 struct page *vmpage = page->cp_vmpage;
182 CLOBINVRNT(env, obj, vvp_object_invariant(obj));
184 if (page->cp_type == CPT_TRANSIENT) {
185 /* DIO pages are referenced by userspace, we don't need to take
186 * a reference on them. (contrast with get_page() call above)
188 cl_page_slice_add(page, cpl, obj,
189 &vvp_transient_page_ops);
192 /* in cache, decref in cl_page_delete() */
193 refcount_inc(&page->cp_ref);
194 SetPagePrivate(vmpage);
195 vmpage->private = (unsigned long)page;
196 cl_page_slice_add(page, cpl, obj, &vvp_page_ops);