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> |
Kent Overstreet | a27bb33 | 2013-05-07 16:19:08 -0700 | [diff] [blame] | 20 | #include <linux/aio.h> |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 21 | #include <linux/uio.h> |
| 22 | #include <linux/bio.h> |
| 23 | #include <linux/workqueue.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/slab.h> |
Jan Kara | 1ae48a6 | 2013-01-28 09:32:54 -0500 | [diff] [blame] | 26 | #include <linux/mm.h> |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 27 | |
| 28 | #include "ext4_jbd2.h" |
| 29 | #include "xattr.h" |
| 30 | #include "acl.h" |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 31 | |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 32 | static struct kmem_cache *io_end_cachep; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 33 | |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 34 | int __init ext4_init_pageio(void) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 35 | { |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 36 | io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 37 | if (io_end_cachep == NULL) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 38 | return -ENOMEM; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 39 | return 0; |
| 40 | } |
| 41 | |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 42 | void ext4_exit_pageio(void) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 43 | { |
| 44 | kmem_cache_destroy(io_end_cachep); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 45 | } |
| 46 | |
Theodore Ts'o | 1ada47d | 2013-03-20 09:39:42 -0400 | [diff] [blame] | 47 | /* |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 48 | * Print an buffer I/O error compatible with the fs/buffer.c. This |
| 49 | * provides compatibility with dmesg scrapers that look for a specific |
| 50 | * buffer I/O error message. We really need a unified error reporting |
| 51 | * structure to userspace ala Digital Unix's uerf system, but it's |
| 52 | * probably not going to happen in my lifetime, due to LKML politics... |
| 53 | */ |
| 54 | static void buffer_io_error(struct buffer_head *bh) |
| 55 | { |
| 56 | char b[BDEVNAME_SIZE]; |
Anatol Pomozov | e8974c3 | 2013-07-11 22:42:42 -0400 | [diff] [blame] | 57 | 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] | 58 | bdevname(bh->b_bdev, b), |
| 59 | (unsigned long long)bh->b_blocknr); |
| 60 | } |
| 61 | |
| 62 | static void ext4_finish_bio(struct bio *bio) |
| 63 | { |
| 64 | int i; |
| 65 | int error = !test_bit(BIO_UPTODATE, &bio->bi_flags); |
Kent Overstreet | 2c30c71 | 2013-11-07 12:20:26 -0800 | [diff] [blame] | 66 | struct bio_vec *bvec; |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 67 | |
Kent Overstreet | 2c30c71 | 2013-11-07 12:20:26 -0800 | [diff] [blame] | 68 | bio_for_each_segment_all(bvec, bio, i) { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 69 | struct page *page = bvec->bv_page; |
| 70 | struct buffer_head *bh, *head; |
| 71 | unsigned bio_start = bvec->bv_offset; |
| 72 | unsigned bio_end = bio_start + bvec->bv_len; |
| 73 | unsigned under_io = 0; |
| 74 | unsigned long flags; |
| 75 | |
| 76 | if (!page) |
| 77 | continue; |
| 78 | |
| 79 | if (error) { |
| 80 | SetPageError(page); |
| 81 | set_bit(AS_EIO, &page->mapping->flags); |
| 82 | } |
| 83 | bh = head = page_buffers(page); |
| 84 | /* |
| 85 | * We check all buffers in the page under BH_Uptodate_Lock |
| 86 | * to avoid races with other end io clearing async_write flags |
| 87 | */ |
| 88 | local_irq_save(flags); |
| 89 | bit_spin_lock(BH_Uptodate_Lock, &head->b_state); |
| 90 | do { |
| 91 | if (bh_offset(bh) < bio_start || |
| 92 | bh_offset(bh) + bh->b_size > bio_end) { |
| 93 | if (buffer_async_write(bh)) |
| 94 | under_io++; |
| 95 | continue; |
| 96 | } |
| 97 | clear_buffer_async_write(bh); |
| 98 | if (error) |
| 99 | buffer_io_error(bh); |
| 100 | } while ((bh = bh->b_this_page) != head); |
| 101 | bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); |
| 102 | local_irq_restore(flags); |
| 103 | if (!under_io) |
| 104 | end_page_writeback(page); |
| 105 | } |
| 106 | } |
| 107 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 108 | 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] | 109 | { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 110 | struct bio *bio, *next_bio; |
| 111 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 112 | BUG_ON(!list_empty(&io_end->list)); |
| 113 | BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN); |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 114 | WARN_ON(io_end->handle); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 115 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 116 | if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count)) |
| 117 | wake_up_all(ext4_ioend_wq(io_end->inode)); |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 118 | |
| 119 | for (bio = io_end->bio; bio; bio = next_bio) { |
| 120 | next_bio = bio->bi_private; |
| 121 | ext4_finish_bio(bio); |
| 122 | bio_put(bio); |
| 123 | } |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 124 | kmem_cache_free(io_end_cachep, io_end); |
| 125 | } |
| 126 | |
| 127 | static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) |
| 128 | { |
| 129 | struct inode *inode = io_end->inode; |
| 130 | |
| 131 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN; |
| 132 | /* Wake up anyone waiting on unwritten extent conversion */ |
| 133 | if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) |
| 134 | wake_up_all(ext4_ioend_wq(inode)); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 135 | } |
| 136 | |
Jan Kara | a115f74 | 2013-06-04 14:30:00 -0400 | [diff] [blame] | 137 | /* |
| 138 | * Check a range of space and convert unwritten extents to written. Note that |
| 139 | * we are protected from truncate touching same part of extent tree by the |
| 140 | * fact that truncate code waits for all DIO to finish (thus exclusion from |
| 141 | * direct IO is achieved) and also waits for PageWriteback bits. Thus we |
| 142 | * cannot get to ext4_ext_truncate() before all IOs overlapping that range are |
| 143 | * completed (happens from ext4_free_ioend()). |
| 144 | */ |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 145 | static int ext4_end_io(ext4_io_end_t *io) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 146 | { |
| 147 | struct inode *inode = io->inode; |
| 148 | loff_t offset = io->offset; |
| 149 | ssize_t size = io->size; |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 150 | handle_t *handle = io->handle; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 151 | int ret = 0; |
| 152 | |
| 153 | ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," |
| 154 | "list->prev 0x%p\n", |
| 155 | io, inode->i_ino, io->list.next, io->list.prev); |
| 156 | |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 157 | io->handle = NULL; /* Following call will use up the handle */ |
| 158 | ret = ext4_convert_unwritten_extents(handle, inode, offset, size); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 159 | if (ret < 0) { |
Theodore Ts'o | b82e384 | 2011-10-31 10:56:32 -0400 | [diff] [blame] | 160 | ext4_msg(inode->i_sb, KERN_EMERG, |
| 161 | "failed to convert unwritten extents to written " |
| 162 | "extents -- potential data loss! " |
| 163 | "(inode %lu, offset %llu, size %zd, error %d)", |
| 164 | inode->i_ino, offset, size, ret); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 165 | } |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 166 | ext4_clear_io_unwritten_flag(io); |
| 167 | ext4_release_io_end(io); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 168 | return ret; |
| 169 | } |
| 170 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 171 | static void dump_completed_IO(struct inode *inode, struct list_head *head) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 172 | { |
| 173 | #ifdef EXT4FS_DEBUG |
| 174 | struct list_head *cur, *before, *after; |
| 175 | ext4_io_end_t *io, *io0, *io1; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 176 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 177 | if (list_empty(head)) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 178 | return; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 179 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 180 | ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); |
| 181 | list_for_each_entry(io, head, list) { |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 182 | cur = &io->list; |
| 183 | before = cur->prev; |
| 184 | io0 = container_of(before, ext4_io_end_t, list); |
| 185 | after = cur->next; |
| 186 | io1 = container_of(after, ext4_io_end_t, list); |
| 187 | |
| 188 | ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", |
| 189 | io, inode->i_ino, io0, io1); |
| 190 | } |
| 191 | #endif |
| 192 | } |
| 193 | |
| 194 | /* Add the io_end to per-inode completed end_io list. */ |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 195 | static void ext4_add_complete_io(ext4_io_end_t *io_end) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 196 | { |
| 197 | struct ext4_inode_info *ei = EXT4_I(io_end->inode); |
Jan Kara | 78371a4 | 2013-10-16 08:25:11 -0400 | [diff] [blame] | 198 | struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 199 | struct workqueue_struct *wq; |
| 200 | unsigned long flags; |
| 201 | |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 202 | /* Only reserved conversions from writeback should enter here */ |
| 203 | WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN)); |
Jan Kara | 78371a4 | 2013-10-16 08:25:11 -0400 | [diff] [blame] | 204 | WARN_ON(!io_end->handle && sbi->s_journal); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 205 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
Jan Kara | 78371a4 | 2013-10-16 08:25:11 -0400 | [diff] [blame] | 206 | wq = sbi->rsv_conversion_wq; |
Christoph Hellwig | 7b7a866 | 2013-09-04 15:04:39 +0200 | [diff] [blame] | 207 | if (list_empty(&ei->i_rsv_conversion_list)) |
| 208 | queue_work(wq, &ei->i_rsv_conversion_work); |
| 209 | list_add_tail(&io_end->list, &ei->i_rsv_conversion_list); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 210 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
| 211 | } |
| 212 | |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 213 | static int ext4_do_flush_completed_IO(struct inode *inode, |
| 214 | struct list_head *head) |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 215 | { |
| 216 | ext4_io_end_t *io; |
Jan Kara | 002bd7f | 2013-01-28 09:49:15 -0500 | [diff] [blame] | 217 | struct list_head unwritten; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 218 | unsigned long flags; |
| 219 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 220 | int err, ret = 0; |
| 221 | |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 222 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 223 | dump_completed_IO(inode, head); |
| 224 | list_replace_init(head, &unwritten); |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 225 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); |
| 226 | |
| 227 | while (!list_empty(&unwritten)) { |
| 228 | io = list_entry(unwritten.next, ext4_io_end_t, list); |
| 229 | BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN)); |
| 230 | list_del_init(&io->list); |
| 231 | |
| 232 | err = ext4_end_io(io); |
| 233 | if (unlikely(!ret && err)) |
| 234 | ret = err; |
Dmitry Monakhov | 28a535f | 2012-09-29 00:14:55 -0400 | [diff] [blame] | 235 | } |
| 236 | return ret; |
| 237 | } |
| 238 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 239 | /* |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 240 | * work on completed IO, to convert unwritten extents to extents |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 241 | */ |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 242 | void ext4_end_io_rsv_work(struct work_struct *work) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 243 | { |
Jan Kara | 84c1754 | 2013-01-28 09:43:46 -0500 | [diff] [blame] | 244 | struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info, |
Jan Kara | 2e8fa54 | 2013-06-04 14:21:02 -0400 | [diff] [blame] | 245 | i_rsv_conversion_work); |
| 246 | ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list); |
| 247 | } |
| 248 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 249 | ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags) |
| 250 | { |
Jesper Juhl | b17b35e | 2010-12-19 21:41:55 -0500 | [diff] [blame] | 251 | 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] | 252 | if (io) { |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 253 | atomic_inc(&EXT4_I(inode)->i_ioend_count); |
| 254 | io->inode = inode; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 255 | INIT_LIST_HEAD(&io->list); |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 256 | atomic_set(&io->count, 1); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 257 | } |
| 258 | return io; |
| 259 | } |
| 260 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 261 | void ext4_put_io_end_defer(ext4_io_end_t *io_end) |
| 262 | { |
| 263 | if (atomic_dec_and_test(&io_end->count)) { |
| 264 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) { |
| 265 | ext4_release_io_end(io_end); |
| 266 | return; |
| 267 | } |
| 268 | ext4_add_complete_io(io_end); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | int ext4_put_io_end(ext4_io_end_t *io_end) |
| 273 | { |
| 274 | int err = 0; |
| 275 | |
| 276 | if (atomic_dec_and_test(&io_end->count)) { |
| 277 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 278 | err = ext4_convert_unwritten_extents(io_end->handle, |
| 279 | io_end->inode, io_end->offset, |
| 280 | io_end->size); |
| 281 | io_end->handle = NULL; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 282 | ext4_clear_io_unwritten_flag(io_end); |
| 283 | } |
| 284 | ext4_release_io_end(io_end); |
| 285 | } |
| 286 | return err; |
| 287 | } |
| 288 | |
| 289 | ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end) |
| 290 | { |
| 291 | atomic_inc(&io_end->count); |
| 292 | return io_end; |
| 293 | } |
| 294 | |
Jan Kara | 822dbba | 2013-07-10 21:31:04 -0400 | [diff] [blame] | 295 | /* BIO completion function for page writeback */ |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 296 | static void ext4_end_bio(struct bio *bio, int error) |
| 297 | { |
| 298 | ext4_io_end_t *io_end = bio->bi_private; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 299 | sector_t bi_sector = bio->bi_iter.bi_sector; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 300 | |
| 301 | BUG_ON(!io_end); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 302 | bio->bi_end_io = NULL; |
| 303 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
| 304 | error = 0; |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 305 | |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 306 | if (error) { |
Jan Kara | b0857d3 | 2013-06-04 14:23:41 -0400 | [diff] [blame] | 307 | struct inode *inode = io_end->inode; |
| 308 | |
Matthew Wilcox | 9503c67 | 2014-04-07 10:54:20 -0400 | [diff] [blame] | 309 | 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] | 310 | "(offset %llu size %ld starting block %llu)", |
Matthew Wilcox | 9503c67 | 2014-04-07 10:54:20 -0400 | [diff] [blame] | 311 | error, inode->i_ino, |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 312 | (unsigned long long) io_end->offset, |
| 313 | (long) io_end->size, |
| 314 | (unsigned long long) |
Curt Wohlgemuth | d50bdd5 | 2011-02-07 12:46:14 -0500 | [diff] [blame] | 315 | bi_sector >> (inode->i_blkbits - 9)); |
Matthew Wilcox | 9503c67 | 2014-04-07 10:54:20 -0400 | [diff] [blame] | 316 | mapping_set_error(inode->i_mapping, error); |
Theodore Ts'o | f7ad6d2 | 2010-11-08 13:43:33 -0500 | [diff] [blame] | 317 | } |
Jan Kara | 822dbba | 2013-07-10 21:31:04 -0400 | [diff] [blame] | 318 | |
| 319 | if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
| 320 | /* |
| 321 | * Link bio into list hanging from io_end. We have to do it |
| 322 | * atomically as bio completions can be racing against each |
| 323 | * other. |
| 324 | */ |
| 325 | bio->bi_private = xchg(&io_end->bio, bio); |
| 326 | ext4_put_io_end_defer(io_end); |
| 327 | } else { |
| 328 | /* |
| 329 | * Drop io_end reference early. Inode can get freed once |
| 330 | * we finish the bio. |
| 331 | */ |
| 332 | ext4_put_io_end_defer(io_end); |
| 333 | ext4_finish_bio(bio); |
| 334 | bio_put(bio); |
| 335 | } |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | void ext4_io_submit(struct ext4_io_submit *io) |
| 339 | { |
| 340 | struct bio *bio = io->io_bio; |
| 341 | |
| 342 | if (bio) { |
| 343 | bio_get(io->io_bio); |
| 344 | submit_bio(io->io_op, io->io_bio); |
| 345 | BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP)); |
| 346 | bio_put(io->io_bio); |
| 347 | } |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 348 | io->io_bio = NULL; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | void ext4_io_submit_init(struct ext4_io_submit *io, |
| 352 | struct writeback_control *wbc) |
| 353 | { |
| 354 | io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE); |
| 355 | io->io_bio = NULL; |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 356 | io->io_end = NULL; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 357 | } |
| 358 | |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 359 | static int io_submit_init_bio(struct ext4_io_submit *io, |
| 360 | struct buffer_head *bh) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 361 | { |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 362 | int nvecs = bio_get_nr_vecs(bh->b_bdev); |
| 363 | struct bio *bio; |
| 364 | |
Theodore Ts'o | 275d3ba | 2011-06-29 21:44:45 -0400 | [diff] [blame] | 365 | bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES)); |
Theodore Ts'o | a1d8d9a7 | 2013-06-06 10:18:22 -0400 | [diff] [blame] | 366 | if (!bio) |
| 367 | return -ENOMEM; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 368 | 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] | 369 | bio->bi_bdev = bh->b_bdev; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 370 | bio->bi_end_io = ext4_end_bio; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 371 | bio->bi_private = ext4_get_io_end(io->io_end); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 372 | io->io_bio = bio; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 373 | io->io_next_block = bh->b_blocknr; |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | static int io_submit_add_bh(struct ext4_io_submit *io, |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 378 | struct inode *inode, |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 379 | struct buffer_head *bh) |
| 380 | { |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 381 | int ret; |
| 382 | |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 383 | if (io->io_bio && bh->b_blocknr != io->io_next_block) { |
| 384 | submit_and_retry: |
| 385 | ext4_io_submit(io); |
| 386 | } |
| 387 | if (io->io_bio == NULL) { |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 388 | ret = io_submit_init_bio(io, bh); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 389 | if (ret) |
| 390 | return ret; |
| 391 | } |
Theodore Ts'o | a549984 | 2013-05-11 19:07:42 -0400 | [diff] [blame] | 392 | ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh)); |
| 393 | if (ret != bh->b_size) |
| 394 | goto submit_and_retry; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 395 | io->io_next_block++; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | int ext4_bio_write_page(struct ext4_io_submit *io, |
| 400 | struct page *page, |
| 401 | int len, |
Namjae Jeon | 1c8349a | 2014-05-12 08:12:25 -0400 | [diff] [blame] | 402 | struct writeback_control *wbc, |
| 403 | bool keep_towrite) |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 404 | { |
| 405 | struct inode *inode = page->mapping->host; |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 406 | unsigned block_start, blocksize; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 407 | struct buffer_head *bh, *head; |
| 408 | int ret = 0; |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 409 | int nr_submitted = 0; |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 410 | |
| 411 | blocksize = 1 << inode->i_blkbits; |
| 412 | |
Curt Wohlgemuth | d50bdd5 | 2011-02-07 12:46:14 -0500 | [diff] [blame] | 413 | BUG_ON(!PageLocked(page)); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 414 | BUG_ON(PageWriteback(page)); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 415 | |
Namjae Jeon | 1c8349a | 2014-05-12 08:12:25 -0400 | [diff] [blame] | 416 | if (keep_towrite) |
| 417 | set_page_writeback_keepwrite(page); |
| 418 | else |
| 419 | set_page_writeback(page); |
Theodore Ts'o | a54aa76 | 2011-02-27 16:43:24 -0500 | [diff] [blame] | 420 | ClearPageError(page); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 421 | |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 422 | /* |
Linus Torvalds | f8409ab | 2014-06-08 13:03:35 -0700 | [diff] [blame] | 423 | * Comments copied from block_write_full_page: |
Jan Kara | eeece46 | 2014-05-27 12:48:55 -0400 | [diff] [blame] | 424 | * |
| 425 | * The page straddles i_size. It must be zeroed out on each and every |
| 426 | * writepage invocation because it may be mmapped. "A file is mapped |
| 427 | * in multiples of the page size. For a file that is not a multiple of |
| 428 | * the page size, the remaining memory is zeroed when mapped, and |
| 429 | * writes to that region are not written out to the file." |
| 430 | */ |
| 431 | if (len < PAGE_CACHE_SIZE) |
| 432 | zero_user_segment(page, len, PAGE_CACHE_SIZE); |
| 433 | /* |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 434 | * In the first loop we prepare and mark buffers to submit. We have to |
| 435 | * mark all buffers in the page before submitting so that |
| 436 | * end_page_writeback() cannot be called from ext4_bio_end_io() when IO |
| 437 | * on the first buffer finishes and we are still working on submitting |
| 438 | * the second buffer. |
| 439 | */ |
| 440 | bh = head = page_buffers(page); |
| 441 | do { |
| 442 | block_start = bh_offset(bh); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 443 | if (block_start >= len) { |
| 444 | clear_buffer_dirty(bh); |
| 445 | set_buffer_uptodate(bh); |
| 446 | continue; |
| 447 | } |
Jan Kara | 8a850c3 | 2013-01-28 20:53:28 -0500 | [diff] [blame] | 448 | if (!buffer_dirty(bh) || buffer_delay(bh) || |
| 449 | !buffer_mapped(bh) || buffer_unwritten(bh)) { |
| 450 | /* A hole? We can safely clear the dirty bit */ |
| 451 | if (!buffer_mapped(bh)) |
| 452 | clear_buffer_dirty(bh); |
| 453 | if (io->io_bio) |
| 454 | ext4_io_submit(io); |
| 455 | continue; |
| 456 | } |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 457 | if (buffer_new(bh)) { |
| 458 | clear_buffer_new(bh); |
| 459 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 460 | } |
| 461 | set_buffer_async_write(bh); |
| 462 | } while ((bh = bh->b_this_page) != head); |
| 463 | |
| 464 | /* Now submit buffers to write */ |
| 465 | bh = head = page_buffers(page); |
| 466 | do { |
| 467 | if (!buffer_async_write(bh)) |
| 468 | continue; |
Jan Kara | 97a851e | 2013-06-04 11:58:58 -0400 | [diff] [blame] | 469 | ret = io_submit_add_bh(io, inode, bh); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 470 | if (ret) { |
| 471 | /* |
| 472 | * We only get here on ENOMEM. Not much else |
| 473 | * we can do but mark the page as dirty, and |
| 474 | * better luck next time. |
| 475 | */ |
Jan Kara | 1ae48a6 | 2013-01-28 09:32:54 -0500 | [diff] [blame] | 476 | redirty_page_for_writepage(wbc, page); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 477 | break; |
| 478 | } |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 479 | nr_submitted++; |
Jan Kara | 1ae48a6 | 2013-01-28 09:32:54 -0500 | [diff] [blame] | 480 | clear_buffer_dirty(bh); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 481 | } while ((bh = bh->b_this_page) != head); |
| 482 | |
| 483 | /* Error stopped previous loop? Clean up buffers... */ |
| 484 | if (ret) { |
| 485 | do { |
| 486 | clear_buffer_async_write(bh); |
| 487 | bh = bh->b_this_page; |
| 488 | } while (bh != head); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 489 | } |
| 490 | unlock_page(page); |
Jan Kara | 0058f96 | 2013-04-11 23:48:32 -0400 | [diff] [blame] | 491 | /* Nothing submitted - we have to end page writeback */ |
| 492 | if (!nr_submitted) |
| 493 | end_page_writeback(page); |
Theodore Ts'o | bd2d021 | 2010-10-27 21:30:10 -0400 | [diff] [blame] | 494 | return ret; |
| 495 | } |