Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext4/page-io.c |
| 3 | * |
| 4 | * This contains the new page_io functions for ext4 |
| 5 | * |
| 6 | * Written by Theodore Ts'o, 2010. |
| 7 | */ |
| 8 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 9 | #include <linux/fs.h> |
| 10 | #include <linux/time.h> |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 11 | #include <linux/highuid.h> |
| 12 | #include <linux/pagemap.h> |
| 13 | #include <linux/quotaops.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/buffer_head.h> |
| 16 | #include <linux/writeback.h> |
| 17 | #include <linux/pagevec.h> |
| 18 | #include <linux/mpage.h> |
| 19 | #include <linux/namei.h> |
| 20 | #include <linux/uio.h> |
| 21 | #include <linux/bio.h> |
| 22 | #include <linux/workqueue.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/slab.h> |
Jan Kara | 1ae48a6 | 2013-01-28 09:32:54 -0500 | [diff] [blame] | 25 | #include <linux/mm.h> |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 26 | |
| 27 | #include "ext4_jbd2.h" |
| 28 | #include "xattr.h" |
| 29 | #include "acl.h" |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 30 | |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 31 | static struct kmem_cache *io_end_cachep; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 32 | |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 33 | int __init ext4_init_pageio(void) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 34 | { |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 35 | io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 36 | if (io_end_cachep == NULL) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 37 | return -ENOMEM; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 38 | return 0; |
| 39 | } |
| 40 | |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 41 | void ext4_exit_pageio(void) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 42 | { |
| 43 | kmem_cache_destroy(io_end_cachep); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 44 | } |
| 45 | |
Theodore Ts'o | 1ada47d | 2013-03-20 09:39:42 -0400 | [diff] [blame] | 46 | /* |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 47 | * Print an buffer I/O error compatible with the fs/buffer.c. This |
| 48 | * provides compatibility with dmesg scrapers that look for a specific |
| 49 | * buffer I/O error message. We really need a unified error reporting |
| 50 | * structure to userspace ala Digital Unix's uerf system, but it's |
| 51 | * probably not going to happen in my lifetime, due to LKML politics... |
| 52 | */ |
| 53 | static void buffer_io_error(struct buffer_head *bh) |
| 54 | { |
| 55 | char b[BDEVNAME_SIZE]; |
Anatol Pomozov | e8974c3 | 2013-07-11 22:42:42 -0400 | [diff] [blame] | 56 | printk_ratelimited(KERN_ERR "Buffer I/O error on device %s, logical block %llu\n", |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 57 | bdevname(bh->b_bdev, b), |
| 58 | (unsigned long long)bh->b_blocknr); |
| 59 | } |
| 60 | |
| 61 | static void ext4_finish_bio(struct bio *bio) |
| 62 | { |
| 63 | int i; |
Kent Overstreet | 2c30c71 | 2013-11-07 12:20:26 -0800 | [diff] [blame] | 64 | struct bio_vec *bvec; |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 65 | |
Kent Overstreet | 2c30c71 | 2013-11-07 12:20:26 -0800 | [diff] [blame] | 66 | bio_for_each_segment_all(bvec, bio, i) { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 67 | struct page *page = bvec->bv_page; |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 68 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| 69 | struct page *data_page = NULL; |
| 70 | struct ext4_crypto_ctx *ctx = NULL; |
| 71 | #endif |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 72 | struct buffer_head *bh, *head; |
| 73 | unsigned bio_start = bvec->bv_offset; |
| 74 | unsigned bio_end = bio_start + bvec->bv_len; |
| 75 | unsigned under_io = 0; |
| 76 | unsigned long flags; |
| 77 | |
| 78 | if (!page) |
| 79 | continue; |
| 80 | |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 81 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| 82 | if (!page->mapping) { |
| 83 | /* The bounce data pages are unmapped. */ |
| 84 | data_page = page; |
| 85 | ctx = (struct ext4_crypto_ctx *)page_private(data_page); |
Theodore Ts'o | 614def7 | 2015-05-31 13:31:34 -0400 | [diff] [blame] | 86 | page = ctx->w.control_page; |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 87 | } |
| 88 | #endif |
| 89 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 90 | if (bio->bi_error) { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 91 | SetPageError(page); |
| 92 | set_bit(AS_EIO, &page->mapping->flags); |
| 93 | } |
| 94 | bh = head = page_buffers(page); |
| 95 | /* |
| 96 | * We check all buffers in the page under BH_Uptodate_Lock |
| 97 | * to avoid races with other end io clearing async_write flags |
| 98 | */ |
| 99 | local_irq_save(flags); |
| 100 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); |
| 101 | do { |
| 102 | if (bh_offset(bh) < bio_start || |
| 103 | bh_offset(bh) + bh->b_size > bio_end) { |
| 104 | if (buffer_async_write(bh)) |
| 105 | under_io++; |
| 106 | continue; |
| 107 | } |
| 108 | clear_buffer_async_write(bh); |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 109 | if (bio->bi_error) |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 110 | buffer_io_error(bh); |
| 111 | } while ((bh = bh->b_this_page) != head); |
| 112 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); |
| 113 | local_irq_restore(flags); |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 114 | if (!under_io) { |
| 115 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| 116 | if (ctx) |
| 117 | ext4_restore_control_page(data_page); |
| 118 | #endif |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 119 | end_page_writeback(page); |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 120 | } |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 121 | } |
| 122 | } |
| 123 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 124 | static void ext4_release_io_end(ext4_io_end_t *io_end) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 125 | { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 126 | struct bio *bio, *next_bio; |
| 127 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 128 | BUG_ON(!list_empty(&io_end->list)); |
| 129 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 130 | WARN_ON(io_end->handle); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 131 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 132 | if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count)) |
| 133 | wake_up_all(ext4_ioend_wq(io_end->inode)); |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 134 | |
| 135 | for (bio = io_end->bio; bio; bio = next_bio) { |
| 136 | next_bio = bio->bi_private; |
| 137 | ext4_finish_bio(bio); |
| 138 | bio_put(bio); |
| 139 | } |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 140 | kmem_cache_free(io_end_cachep, io_end); |
| 141 | } |
| 142 | |
| 143 | static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) |
| 144 | { |
| 145 | struct inode *inode = io_end->inode; |
| 146 | |
| 147 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN; |
| 148 | /* Wake up anyone waiting on unwritten extent conversion */ |
| 149 | if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) |
| 150 | wake_up_all(ext4_ioend_wq(inode)); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 151 | } |
| 152 | |
Jan Kara | a115f74 | 2013-06-04 14:30:00 -0400 | [diff] [blame] | 153 | /* |
| 154 | * Check a range of space and convert unwritten extents to written. Note that |
| 155 | * we are protected from truncate touching same part of extent tree by the |
| 156 | * fact that truncate code waits for all DIO to finish (thus exclusion from |
| 157 | * direct IO is achieved) and also waits for PageWriteback bits. Thus we |
| 158 | * cannot get to ext4_ext_truncate() before all IOs overlapping that range are |
| 159 | * completed (happens from ext4_free_ioend()). |
| 160 | */ |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 161 | static int ext4_end_io(ext4_io_end_t *io) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 162 | { |
| 163 | struct inode *inode = io->inode; |
| 164 | loff_t offset = io->offset; |
| 165 | ssize_t size = io->size; |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 166 | handle_t *handle = io->handle; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 167 | int ret = 0; |
| 168 | |
| 169 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," |
| 170 | "list->prev 0x%p\n", |
| 171 | io, inode->i_ino, io->list.next, io->list.prev); |
| 172 | |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 173 | io->handle = NULL; /* Following call will use up the handle */ |
| 174 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 175 | if (ret < 0) { |
Theodore Ts'o | b82e384 | 2011-10-31 10:56:32 -0400 | [diff] [blame] | 176 | ext4_msg(inode->i_sb, KERN_EMERG, |
| 177 | "failed to convert unwritten extents to written " |
| 178 | "extents -- potential data loss! " |
| 179 | "(inode %lu, offset %llu, size %zd, error %d)", |
| 180 | inode->i_ino, offset, size, ret); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 181 | } |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 182 | ext4_clear_io_unwritten_flag(io); |
| 183 | ext4_release_io_end(io); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 184 | return ret; |
| 185 | } |
| 186 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 187 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 188 | { |
| 189 | #ifdef EXT4FS_DEBUG |
| 190 | struct list_head *cur, *before, *after; |
| 191 | ext4_io_end_t *io, *io0, *io1; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 192 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 193 | if (list_empty(head)) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 194 | return; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 195 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 196 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
| 197 | list_for_each_entry(io, head, list) { |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 198 | cur = &io->list; |
| 199 | before = cur->prev; |
| 200 | io0 = container_of(before, ext4_io_end_t, list); |
| 201 | after = cur->next; |
| 202 | io1 = container_of(after, ext4_io_end_t, list); |
| 203 | |
| 204 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", |
| 205 | io, inode->i_ino, io0, io1); |
| 206 | } |
| 207 | #endif |
| 208 | } |
| 209 | |
| 210 | /* Add the io_end to per-inode completed end_io list. */ |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 211 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 212 | { |
| 213 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
Jan Kara | 78371a4 | 2013-10-16 08:25:11 -0400 | [diff] [blame] | 214 | struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 215 | struct workqueue_struct *wq; |
| 216 | unsigned long flags; |
| 217 | |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 218 | /* Only reserved conversions from writeback should enter here */ |
| 219 | WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); |
Jan Kara | 78371a4 | 2013-10-16 08:25:11 -0400 | [diff] [blame] | 220 | WARN_ON(!io_end->handle && sbi->s_journal); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 221 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
Jan Kara | 78371a4 | 2013-10-16 08:25:11 -0400 | [diff] [blame] | 222 | wq = sbi->rsv_conversion_wq; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 223 | if (list_empty(&ei->i_rsv_conversion_list)) |
| 224 | queue_work(wq, &ei->i_rsv_conversion_work); |
| 225 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 226 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
| 227 | } |
| 228 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 229 | static int ext4_do_flush_completed_IO(struct inode *inode, |
| 230 | struct list_head *head) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 231 | { |
| 232 | ext4_io_end_t *io; |
Jan Kara | 002bd7f | 2013-01-28 09:49:15 -0500 | [diff] [blame] | 233 | struct list_head unwritten; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 234 | unsigned long flags; |
| 235 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 236 | int err, ret = 0; |
| 237 | |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 238 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 239 | dump_completed_IO(inode, head); |
| 240 | list_replace_init(head, &unwritten); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 241 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
| 242 | |
| 243 | while (!list_empty(&unwritten)) { |
| 244 | io = list_entry(unwritten.next, ext4_io_end_t, list); |
| 245 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); |
| 246 | list_del_init(&io->list); |
| 247 | |
| 248 | err = ext4_end_io(io); |
| 249 | if (unlikely(!ret && err)) |
| 250 | ret = err; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 251 | } |
| 252 | return ret; |
| 253 | } |
| 254 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 255 | /* |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 256 | * work on completed IO, to convert unwritten extents to extents |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 257 | */ |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 258 | void ext4_end_io_rsv_work(struct work_struct *work) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 259 | { |
Jan Kara | 84c1754 | 2013-01-28 09:43:46 -0500 | [diff] [blame] | 260 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 261 | i_rsv_conversion_work); |
| 262 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); |
| 263 | } |
| 264 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 265 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) |
| 266 | { |
Jesper Juhl | b17b35e | 2010-12-19 21:41:55 -0500 | [diff] [blame] | 267 | ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 268 | if (io) { |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 269 | atomic_inc(&EXT4_I(inode)->i_ioend_count); |
| 270 | io->inode = inode; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 271 | INIT_LIST_HEAD(&io->list); |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 272 | atomic_set(&io->count, 1); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 273 | } |
| 274 | return io; |
| 275 | } |
| 276 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 277 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
| 278 | { |
| 279 | if (atomic_dec_and_test(&io_end->count)) { |
| 280 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { |
| 281 | ext4_release_io_end(io_end); |
| 282 | return; |
| 283 | } |
| 284 | ext4_add_complete_io(io_end); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | int ext4_put_io_end(ext4_io_end_t *io_end) |
| 289 | { |
| 290 | int err = 0; |
| 291 | |
| 292 | if (atomic_dec_and_test(&io_end->count)) { |
| 293 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 294 | err = ext4_convert_unwritten_extents(io_end->handle, |
| 295 | io_end->inode, io_end->offset, |
| 296 | io_end->size); |
| 297 | io_end->handle = NULL; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 298 | ext4_clear_io_unwritten_flag(io_end); |
| 299 | } |
| 300 | ext4_release_io_end(io_end); |
| 301 | } |
| 302 | return err; |
| 303 | } |
| 304 | |
| 305 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) |
| 306 | { |
| 307 | atomic_inc(&io_end->count); |
| 308 | return io_end; |
| 309 | } |
| 310 | |
Jan Kara | 822dbba | 2013-07-10 21:31:04 -0400 | [diff] [blame] | 311 | /* BIO completion function for page writeback */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 312 | static void ext4_end_bio(struct bio *bio) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 313 | { |
| 314 | ext4_io_end_t *io_end = bio->bi_private; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 315 | sector_t bi_sector = bio->bi_iter.bi_sector; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 316 | |
| 317 | BUG_ON(!io_end); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 318 | bio->bi_end_io = NULL; |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 319 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 320 | if (bio->bi_error) { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 321 | struct inode *inode = io_end->inode; |
| 322 | |
Matthew Wilcox | 9503c67 | 2014-04-07 10:54:20 -0400 | [diff] [blame] | 323 | ext4_warning(inode->i_sb, "I/O error %d writing to inode %lu " |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 324 | "(offset %llu size %ld starting block %llu)", |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 325 | bio->bi_error, inode->i_ino, |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 326 | (unsigned long long) io_end->offset, |
| 327 | (long) io_end->size, |
| 328 | (unsigned long long) |
Curt Wohlgemuth | d50bdd5 | 2011-02-07 12:46:14 -0500 | [diff] [blame] | 329 | bi_sector >> (inode->i_blkbits - 9)); |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 330 | mapping_set_error(inode->i_mapping, bio->bi_error); |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 331 | } |
Jan Kara | 822dbba | 2013-07-10 21:31:04 -0400 | [diff] [blame] | 332 | |
| 333 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
| 334 | /* |
| 335 | * Link bio into list hanging from io_end. We have to do it |
| 336 | * atomically as bio completions can be racing against each |
| 337 | * other. |
| 338 | */ |
| 339 | bio->bi_private = xchg(&io_end->bio, bio); |
| 340 | ext4_put_io_end_defer(io_end); |
| 341 | } else { |
| 342 | /* |
| 343 | * Drop io_end reference early. Inode can get freed once |
| 344 | * we finish the bio. |
| 345 | */ |
| 346 | ext4_put_io_end_defer(io_end); |
| 347 | ext4_finish_bio(bio); |
| 348 | bio_put(bio); |
| 349 | } |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | void ext4_io_submit(struct ext4_io_submit *io) |
| 353 | { |
| 354 | struct bio *bio = io->io_bio; |
| 355 | |
| 356 | if (bio) { |
Tejun Heo | 5a33911 | 2015-07-21 23:50:24 -0400 | [diff] [blame] | 357 | int io_op = io->io_wbc->sync_mode == WB_SYNC_ALL ? |
| 358 | WRITE_SYNC : WRITE; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 359 | bio_get(io->io_bio); |
Tejun Heo | 5a33911 | 2015-07-21 23:50:24 -0400 | [diff] [blame] | 360 | submit_bio(io_op, io->io_bio); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 361 | bio_put(io->io_bio); |
| 362 | } |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 363 | io->io_bio = NULL; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | void ext4_io_submit_init(struct ext4_io_submit *io, |
| 367 | struct writeback_control *wbc) |
| 368 | { |
Tejun Heo | 5a33911 | 2015-07-21 23:50:24 -0400 | [diff] [blame] | 369 | io->io_wbc = wbc; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 370 | io->io_bio = NULL; |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 371 | io->io_end = NULL; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 372 | } |
| 373 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 374 | static int io_submit_init_bio(struct ext4_io_submit *io, |
| 375 | struct buffer_head *bh) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 376 | { |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 377 | struct bio *bio; |
| 378 | |
Kent Overstreet | b54ffb7 | 2015-05-19 14:31:01 +0200 | [diff] [blame] | 379 | bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); |
Theodore Ts'o | a1d8d9a7 | 2013-06-06 10:18:22 -0400 | [diff] [blame] | 380 | if (!bio) |
| 381 | return -ENOMEM; |
Tejun Heo | 001e4a8 | 2015-07-21 23:51:26 -0400 | [diff] [blame] | 382 | wbc_init_bio(io->io_wbc, bio); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 383 | bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 384 | bio->bi_bdev = bh->b_bdev; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 385 | bio->bi_end_io = ext4_end_bio; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 386 | bio->bi_private = ext4_get_io_end(io->io_end); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 387 | io->io_bio = bio; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 388 | io->io_next_block = bh->b_blocknr; |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static int io_submit_add_bh(struct ext4_io_submit *io, |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 393 | struct inode *inode, |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 394 | struct page *page, |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 395 | struct buffer_head *bh) |
| 396 | { |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 397 | int ret; |
| 398 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 399 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
| 400 | submit_and_retry: |
| 401 | ext4_io_submit(io); |
| 402 | } |
| 403 | if (io->io_bio == NULL) { |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 404 | ret = io_submit_init_bio(io, bh); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 405 | if (ret) |
| 406 | return ret; |
| 407 | } |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 408 | ret = bio_add_page(io->io_bio, page, bh->b_size, bh_offset(bh)); |
Theodore Ts'o | a549984 | 2013-05-11 19:07:42 -0400 | [diff] [blame] | 409 | if (ret != bh->b_size) |
| 410 | goto submit_and_retry; |
Tejun Heo | 001e4a8 | 2015-07-21 23:51:26 -0400 | [diff] [blame] | 411 | wbc_account_io(io->io_wbc, page, bh->b_size); |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 412 | io->io_next_block++; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | int ext4_bio_write_page(struct ext4_io_submit *io, |
| 417 | struct page *page, |
| 418 | int len, |
Namjae Jeon | 1c8349a | 2014-05-12 08:12:25 -0400 | [diff] [blame] | 419 | struct writeback_control *wbc, |
| 420 | bool keep_towrite) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 421 | { |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 422 | struct page *data_page = NULL; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 423 | struct inode *inode = page->mapping->host; |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 424 | unsigned block_start, blocksize; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 425 | struct buffer_head *bh, *head; |
| 426 | int ret = 0; |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 427 | int nr_submitted = 0; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 428 | |
| 429 | blocksize = 1 << inode->i_blkbits; |
| 430 | |
Curt Wohlgemuth | d50bdd5 | 2011-02-07 12:46:14 -0500 | [diff] [blame] | 431 | BUG_ON(!PageLocked(page)); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 432 | BUG_ON(PageWriteback(page)); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 433 | |
Namjae Jeon | 1c8349a | 2014-05-12 08:12:25 -0400 | [diff] [blame] | 434 | if (keep_towrite) |
| 435 | set_page_writeback_keepwrite(page); |
| 436 | else |
| 437 | set_page_writeback(page); |
Theodore Ts'o | a54aa76 | 2011-02-27 16:43:24 -0500 | [diff] [blame] | 438 | ClearPageError(page); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 439 | |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 440 | /* |
Linus Torvalds | f8409ab | 2014-06-08 13:03:35 -0700 | [diff] [blame] | 441 | * Comments copied from block_write_full_page: |
Jan Kara | eeece46 | 2014-05-27 12:48:55 -0400 | [diff] [blame] | 442 | * |
| 443 | * The page straddles i_size. It must be zeroed out on each and every |
| 444 | * writepage invocation because it may be mmapped. "A file is mapped |
| 445 | * in multiples of the page size. For a file that is not a multiple of |
| 446 | * the page size, the remaining memory is zeroed when mapped, and |
| 447 | * writes to that region are not written out to the file." |
| 448 | */ |
| 449 | if (len < PAGE_CACHE_SIZE) |
| 450 | zero_user_segment(page, len, PAGE_CACHE_SIZE); |
| 451 | /* |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 452 | * In the first loop we prepare and mark buffers to submit. We have to |
| 453 | * mark all buffers in the page before submitting so that |
| 454 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO |
| 455 | * on the first buffer finishes and we are still working on submitting |
| 456 | * the second buffer. |
| 457 | */ |
| 458 | bh = head = page_buffers(page); |
| 459 | do { |
| 460 | block_start = bh_offset(bh); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 461 | if (block_start >= len) { |
| 462 | clear_buffer_dirty(bh); |
| 463 | set_buffer_uptodate(bh); |
| 464 | continue; |
| 465 | } |
Jan Kara | 8a850c3 | 2013-01-28 20:53:28 -0500 | [diff] [blame] | 466 | if (!buffer_dirty(bh) || buffer_delay(bh) || |
| 467 | !buffer_mapped(bh) || buffer_unwritten(bh)) { |
| 468 | /* A hole? We can safely clear the dirty bit */ |
| 469 | if (!buffer_mapped(bh)) |
| 470 | clear_buffer_dirty(bh); |
| 471 | if (io->io_bio) |
| 472 | ext4_io_submit(io); |
| 473 | continue; |
| 474 | } |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 475 | if (buffer_new(bh)) { |
| 476 | clear_buffer_new(bh); |
| 477 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 478 | } |
| 479 | set_buffer_async_write(bh); |
| 480 | } while ((bh = bh->b_this_page) != head); |
| 481 | |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 482 | bh = head = page_buffers(page); |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 483 | |
| 484 | if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode)) { |
| 485 | data_page = ext4_encrypt(inode, page); |
| 486 | if (IS_ERR(data_page)) { |
| 487 | ret = PTR_ERR(data_page); |
| 488 | data_page = NULL; |
| 489 | goto out; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | /* Now submit buffers to write */ |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 494 | do { |
| 495 | if (!buffer_async_write(bh)) |
| 496 | continue; |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 497 | ret = io_submit_add_bh(io, inode, |
| 498 | data_page ? data_page : page, bh); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 499 | if (ret) { |
| 500 | /* |
| 501 | * We only get here on ENOMEM. Not much else |
| 502 | * we can do but mark the page as dirty, and |
| 503 | * better luck next time. |
| 504 | */ |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 505 | break; |
| 506 | } |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 507 | nr_submitted++; |
Jan Kara | 1ae48a6 | 2013-01-28 09:32:54 -0500 | [diff] [blame] | 508 | clear_buffer_dirty(bh); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 509 | } while ((bh = bh->b_this_page) != head); |
| 510 | |
| 511 | /* Error stopped previous loop? Clean up buffers... */ |
| 512 | if (ret) { |
Michael Halcrow | 2058f83 | 2015-04-12 00:55:10 -0400 | [diff] [blame] | 513 | out: |
| 514 | if (data_page) |
| 515 | ext4_restore_control_page(data_page); |
| 516 | printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret); |
| 517 | redirty_page_for_writepage(wbc, page); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 518 | do { |
| 519 | clear_buffer_async_write(bh); |
| 520 | bh = bh->b_this_page; |
| 521 | } while (bh != head); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 522 | } |
| 523 | unlock_page(page); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 524 | /* Nothing submitted - we have to end page writeback */ |
| 525 | if (!nr_submitted) |
| 526 | end_page_writeback(page); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 527 | return ret; |
| 528 | } |