page_io.c (8a84fc15ae5cafcc366dd85cf8e1ab2040679abc) page_io.c (3aef83e0ef1ffb8ea3bea97be46821a45c952173)
1/*
2 * linux/mm/page_io.c
3 *
4 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
5 *
6 * Swap reorganised 29.12.95,
7 * Asynchronous swapping added 30.12.95. Stephen Tweedie
8 * Removed race in async swapping. 14.4.1996. Bruno Haible

--- 133 unchanged lines hidden (view full) ---

142 ret = -ENOMEM;
143 goto out;
144 }
145 count_vm_event(PSWPIN);
146 submit_bio(READ, bio);
147out:
148 return ret;
149}
1/*
2 * linux/mm/page_io.c
3 *
4 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
5 *
6 * Swap reorganised 29.12.95,
7 * Asynchronous swapping added 30.12.95. Stephen Tweedie
8 * Removed race in async swapping. 14.4.1996. Bruno Haible

--- 133 unchanged lines hidden (view full) ---

142 ret = -ENOMEM;
143 goto out;
144 }
145 count_vm_event(PSWPIN);
146 submit_bio(READ, bio);
147out:
148 return ret;
149}
150
151#ifdef CONFIG_SOFTWARE_SUSPEND
152/*
153 * A scruffy utility function to read or write an arbitrary swap page
154 * and wait on the I/O. The caller must have a ref on the page.
155 *
156 * We use end_swap_bio_read() even for writes, because it happens to do what
157 * we want.
158 */
159int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
160 struct bio **bio_chain)
161{
162 struct bio *bio;
163 int ret = 0;
164 int bio_rw;
165
166 lock_page(page);
167
168 bio = get_swap_bio(GFP_KERNEL, entry.val, page, end_swap_bio_read);
169 if (bio == NULL) {
170 unlock_page(page);
171 ret = -ENOMEM;
172 goto out;
173 }
174
175 bio_rw = rw;
176 if (!bio_chain)
177 bio_rw |= (1 << BIO_RW_SYNC);
178 if (bio_chain)
179 bio_get(bio);
180 submit_bio(bio_rw, bio);
181 if (bio_chain == NULL) {
182 wait_on_page_locked(page);
183
184 if (!PageUptodate(page) || PageError(page))
185 ret = -EIO;
186 }
187 if (bio_chain) {
188 bio->bi_private = *bio_chain;
189 *bio_chain = bio;
190 }
191out:
192 return ret;
193}
194#endif