Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/file.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/file.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 15 | * ext4 fs regular file handling primitives |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 16 | * |
| 17 | * 64-bit file support on 64-bit platforms by Jakub Jelinek |
| 18 | * (jj@sunsite.ms.mff.cuni.cz) |
| 19 | */ |
| 20 | |
| 21 | #include <linux/time.h> |
| 22 | #include <linux/fs.h> |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 23 | #include <linux/mount.h> |
| 24 | #include <linux/path.h> |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 25 | #include <linux/dax.h> |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 26 | #include <linux/quotaops.h> |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 27 | #include <linux/pagevec.h> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 28 | #include <linux/uio.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 29 | #include "ext4.h" |
| 30 | #include "ext4_jbd2.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 31 | #include "xattr.h" |
| 32 | #include "acl.h" |
| 33 | |
| 34 | /* |
| 35 | * Called when an inode is released. Note that this is different |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 36 | * from ext4_file_open: open gets called at every open, but release |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 37 | * gets called only when /all/ the files are closed. |
| 38 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 39 | static int ext4_release_file(struct inode *inode, struct file *filp) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 40 | { |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 41 | if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) { |
Theodore Ts'o | 7d8f9f7 | 2009-02-24 08:21:14 -0500 | [diff] [blame] | 42 | ext4_alloc_da_blocks(inode); |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 43 | ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
Theodore Ts'o | 7d8f9f7 | 2009-02-24 08:21:14 -0500 | [diff] [blame] | 44 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 45 | /* if we are the last writer on the inode, drop the block reservation */ |
| 46 | if ((filp->f_mode & FMODE_WRITE) && |
Aneesh Kumar K.V | d601430 | 2009-03-27 22:36:43 -0400 | [diff] [blame] | 47 | (atomic_read(&inode->i_writecount) == 1) && |
| 48 | !EXT4_I(inode)->i_reserved_data_blocks) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 49 | { |
Aneesh Kumar K.V | 0e855ac | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 50 | down_write(&EXT4_I(inode)->i_data_sem); |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 51 | ext4_discard_preallocations(inode); |
Aneesh Kumar K.V | 0e855ac | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 52 | up_write(&EXT4_I(inode)->i_data_sem); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 53 | } |
| 54 | if (is_dx(inode) && filp->private_data) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 55 | ext4_htree_free_dir_info(filp->private_data); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
Stephen Hemminger | c197855 | 2014-05-12 10:50:23 -0400 | [diff] [blame] | 60 | static void ext4_unwritten_wait(struct inode *inode) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 61 | { |
| 62 | wait_queue_head_t *wq = ext4_ioend_wq(inode); |
| 63 | |
Dmitry Monakhov | e27f41e | 2012-09-28 23:24:52 -0400 | [diff] [blame] | 64 | wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0)); |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | /* |
| 68 | * This tests whether the IO in question is block-aligned or not. |
| 69 | * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they |
| 70 | * are converted to written only after the IO is complete. Until they are |
| 71 | * mapped, these blocks appear as holes, so dio_zero_block() will assume that |
| 72 | * it needs to zero out portions of the start and/or end block. If 2 AIO |
| 73 | * threads are at work on the same unwritten block, they must be synchronized |
| 74 | * or one thread will zero the other's data, causing corruption. |
| 75 | */ |
| 76 | static int |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 77 | ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 78 | { |
| 79 | struct super_block *sb = inode->i_sb; |
| 80 | int blockmask = sb->s_blocksize - 1; |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 81 | |
Theodore Ts'o | 6e6358f | 2014-04-12 12:45:25 -0400 | [diff] [blame] | 82 | if (pos >= i_size_read(inode)) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 83 | return 0; |
| 84 | |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 85 | if ((pos | iov_iter_alignment(from)) & blockmask) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 86 | return 1; |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 91 | static ssize_t |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 92 | ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 93 | { |
Theodore Ts'o | 7608e61 | 2014-04-21 14:26:28 -0400 | [diff] [blame] | 94 | struct file *file = iocb->ki_filp; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 95 | struct inode *inode = file_inode(iocb->ki_filp); |
Theodore Ts'o | 7ed07ba | 2014-04-21 14:36:30 -0400 | [diff] [blame] | 96 | struct mutex *aio_mutex = NULL; |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 97 | struct blk_plug plug; |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 98 | int o_direct = iocb->ki_flags & IOCB_DIRECT; |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 99 | int overwrite = 0; |
Zheng Liu | 8563000 | 2012-05-28 18:06:51 -0400 | [diff] [blame] | 100 | ssize_t ret; |
Theodore Ts'o | 7608e61 | 2014-04-21 14:26:28 -0400 | [diff] [blame] | 101 | |
Eric Sandeen | e2b4657 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 102 | /* |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 103 | * Unaligned direct AIO must be serialized; see comment above |
| 104 | * In the case of O_APPEND, assume that we must always serialize |
| 105 | */ |
| 106 | if (o_direct && |
| 107 | ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && |
| 108 | !is_sync_kiocb(iocb) && |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 109 | (iocb->ki_flags & IOCB_APPEND || |
Al Viro | e768d7f | 2015-04-07 14:48:22 -0400 | [diff] [blame] | 110 | ext4_unaligned_aio(inode, from, iocb->ki_pos))) { |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 111 | aio_mutex = ext4_aio_mutex(inode); |
| 112 | mutex_lock(aio_mutex); |
| 113 | ext4_unwritten_wait(inode); |
| 114 | } |
| 115 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 116 | inode_lock(inode); |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 117 | ret = generic_write_checks(iocb, from); |
| 118 | if (ret <= 0) |
Al Viro | e768d7f | 2015-04-07 14:48:22 -0400 | [diff] [blame] | 119 | goto out; |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 120 | |
| 121 | /* |
Eric Sandeen | e2b4657 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 122 | * If we have encountered a bitmap-format file, the size limit |
| 123 | * is smaller than s_maxbytes, which is for extent-mapped files. |
| 124 | */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 125 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
Eric Sandeen | e2b4657 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 126 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Eric Sandeen | e2b4657 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 127 | |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 128 | if (iocb->ki_pos >= sbi->s_bitmap_maxbytes) { |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 129 | ret = -EFBIG; |
Al Viro | e768d7f | 2015-04-07 14:48:22 -0400 | [diff] [blame] | 130 | goto out; |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 131 | } |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 132 | iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos); |
Eric Sandeen | e2b4657 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 133 | } |
| 134 | |
Dmitry Monakhov | a41537e | 2014-10-30 10:53:16 -0400 | [diff] [blame] | 135 | iocb->private = &overwrite; |
Theodore Ts'o | 7ed07ba | 2014-04-21 14:36:30 -0400 | [diff] [blame] | 136 | if (o_direct) { |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 137 | size_t length = iov_iter_count(from); |
| 138 | loff_t pos = iocb->ki_pos; |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 139 | blk_start_plug(&plug); |
| 140 | |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 141 | /* check whether we do a DIO overwrite or not */ |
Theodore Ts'o | 7ed07ba | 2014-04-21 14:36:30 -0400 | [diff] [blame] | 142 | if (ext4_should_dioread_nolock(inode) && !aio_mutex && |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 143 | !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) { |
| 144 | struct ext4_map_blocks map; |
| 145 | unsigned int blkbits = inode->i_blkbits; |
| 146 | int err, len; |
| 147 | |
| 148 | map.m_lblk = pos >> blkbits; |
| 149 | map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits) |
| 150 | - map.m_lblk; |
| 151 | len = map.m_len; |
| 152 | |
| 153 | err = ext4_map_blocks(NULL, inode, &map, 0); |
| 154 | /* |
| 155 | * 'err==len' means that all of blocks has |
| 156 | * been preallocated no matter they are |
| 157 | * initialized or not. For excluding |
| 158 | * unwritten extents, we need to check |
| 159 | * m_flags. There are two conditions that |
| 160 | * indicate for initialized extents. 1) If we |
| 161 | * hit extent cache, EXT4_MAP_MAPPED flag is |
| 162 | * returned; 2) If we do a real lookup, |
| 163 | * non-flags are returned. So we should check |
| 164 | * these two conditions. |
| 165 | */ |
| 166 | if (err == len && (map.m_flags & EXT4_MAP_MAPPED)) |
| 167 | overwrite = 1; |
| 168 | } |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 169 | } |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 170 | |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 171 | ret = __generic_file_write_iter(iocb, from); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 172 | inode_unlock(inode); |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 173 | |
Theodore Ts'o | 7ed07ba | 2014-04-21 14:36:30 -0400 | [diff] [blame] | 174 | if (ret > 0) { |
| 175 | ssize_t err; |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 176 | |
Theodore Ts'o | 7ed07ba | 2014-04-21 14:36:30 -0400 | [diff] [blame] | 177 | err = generic_write_sync(file, iocb->ki_pos - ret, ret); |
| 178 | if (err < 0) |
| 179 | ret = err; |
| 180 | } |
| 181 | if (o_direct) |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 182 | blk_finish_plug(&plug); |
| 183 | |
Al Viro | e768d7f | 2015-04-07 14:48:22 -0400 | [diff] [blame] | 184 | if (aio_mutex) |
| 185 | mutex_unlock(aio_mutex); |
| 186 | return ret; |
| 187 | |
| 188 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 189 | inode_unlock(inode); |
Theodore Ts'o | 7ed07ba | 2014-04-21 14:36:30 -0400 | [diff] [blame] | 190 | if (aio_mutex) |
| 191 | mutex_unlock(aio_mutex); |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 192 | return ret; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 195 | #ifdef CONFIG_FS_DAX |
| 196 | static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 197 | { |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 198 | int result; |
| 199 | handle_t *handle = NULL; |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 200 | struct inode *inode = file_inode(vma->vm_file); |
| 201 | struct super_block *sb = inode->i_sb; |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 202 | bool write = vmf->flags & FAULT_FLAG_WRITE; |
| 203 | |
| 204 | if (write) { |
| 205 | sb_start_pagefault(sb); |
| 206 | file_update_time(vma->vm_file); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 207 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 208 | handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE, |
| 209 | EXT4_DATA_TRANS_BLOCKS(sb)); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 210 | } else |
| 211 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 212 | |
| 213 | if (IS_ERR(handle)) |
| 214 | result = VM_FAULT_SIGBUS; |
| 215 | else |
Jan Kara | ba5843f | 2015-12-07 15:10:44 -0500 | [diff] [blame] | 216 | result = __dax_fault(vma, vmf, ext4_dax_mmap_get_block, NULL); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 217 | |
| 218 | if (write) { |
| 219 | if (!IS_ERR(handle)) |
| 220 | ext4_journal_stop(handle); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 221 | up_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 222 | sb_end_pagefault(sb); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 223 | } else |
| 224 | up_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 225 | |
| 226 | return result; |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 227 | } |
| 228 | |
Matthew Wilcox | 11bd1a9 | 2015-09-08 14:59:03 -0700 | [diff] [blame] | 229 | static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, |
| 230 | pmd_t *pmd, unsigned int flags) |
| 231 | { |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 232 | int result; |
| 233 | handle_t *handle = NULL; |
| 234 | struct inode *inode = file_inode(vma->vm_file); |
| 235 | struct super_block *sb = inode->i_sb; |
| 236 | bool write = flags & FAULT_FLAG_WRITE; |
| 237 | |
| 238 | if (write) { |
| 239 | sb_start_pagefault(sb); |
| 240 | file_update_time(vma->vm_file); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 241 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 242 | handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE, |
| 243 | ext4_chunk_trans_blocks(inode, |
| 244 | PMD_SIZE / PAGE_SIZE)); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 245 | } else |
| 246 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 247 | |
| 248 | if (IS_ERR(handle)) |
| 249 | result = VM_FAULT_SIGBUS; |
| 250 | else |
| 251 | result = __dax_pmd_fault(vma, addr, pmd, flags, |
Jan Kara | ba5843f | 2015-12-07 15:10:44 -0500 | [diff] [blame] | 252 | ext4_dax_mmap_get_block, NULL); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 253 | |
| 254 | if (write) { |
| 255 | if (!IS_ERR(handle)) |
| 256 | ext4_journal_stop(handle); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 257 | up_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 258 | sb_end_pagefault(sb); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 259 | } else |
| 260 | up_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 261 | |
| 262 | return result; |
Matthew Wilcox | 11bd1a9 | 2015-09-08 14:59:03 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 265 | static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 266 | { |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 267 | int err; |
| 268 | struct inode *inode = file_inode(vma->vm_file); |
| 269 | |
| 270 | sb_start_pagefault(inode->i_sb); |
| 271 | file_update_time(vma->vm_file); |
| 272 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Jan Kara | ba5843f | 2015-12-07 15:10:44 -0500 | [diff] [blame] | 273 | err = __dax_mkwrite(vma, vmf, ext4_dax_mmap_get_block, NULL); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 274 | up_read(&EXT4_I(inode)->i_mmap_sem); |
| 275 | sb_end_pagefault(inode->i_sb); |
| 276 | |
| 277 | return err; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Handle write fault for VM_MIXEDMAP mappings. Similarly to ext4_dax_mkwrite() |
| 282 | * handler we check for races agaist truncate. Note that since we cycle through |
| 283 | * i_mmap_sem, we are sure that also any hole punching that began before we |
| 284 | * were called is finished by now and so if it included part of the file we |
| 285 | * are working on, our pte will get unmapped and the check for pte_same() in |
| 286 | * wp_pfn_shared() fails. Thus fault gets retried and things work out as |
| 287 | * desired. |
| 288 | */ |
| 289 | static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma, |
| 290 | struct vm_fault *vmf) |
| 291 | { |
| 292 | struct inode *inode = file_inode(vma->vm_file); |
| 293 | struct super_block *sb = inode->i_sb; |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 294 | loff_t size; |
Ross Zwisler | d5be7a0 | 2016-01-22 15:10:53 -0800 | [diff] [blame] | 295 | int ret; |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 296 | |
| 297 | sb_start_pagefault(sb); |
| 298 | file_update_time(vma->vm_file); |
| 299 | down_read(&EXT4_I(inode)->i_mmap_sem); |
| 300 | size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 301 | if (vmf->pgoff >= size) |
| 302 | ret = VM_FAULT_SIGBUS; |
Ross Zwisler | d5be7a0 | 2016-01-22 15:10:53 -0800 | [diff] [blame] | 303 | else |
| 304 | ret = dax_pfn_mkwrite(vma, vmf); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 305 | up_read(&EXT4_I(inode)->i_mmap_sem); |
| 306 | sb_end_pagefault(sb); |
| 307 | |
| 308 | return ret; |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 309 | } |
| 310 | |
| 311 | static const struct vm_operations_struct ext4_dax_vm_ops = { |
| 312 | .fault = ext4_dax_fault, |
Matthew Wilcox | 11bd1a9 | 2015-09-08 14:59:03 -0700 | [diff] [blame] | 313 | .pmd_fault = ext4_dax_pmd_fault, |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 314 | .page_mkwrite = ext4_dax_mkwrite, |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 315 | .pfn_mkwrite = ext4_dax_pfn_mkwrite, |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 316 | }; |
| 317 | #else |
| 318 | #define ext4_dax_vm_ops ext4_file_vm_ops |
| 319 | #endif |
| 320 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 321 | static const struct vm_operations_struct ext4_file_vm_ops = { |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 322 | .fault = ext4_filemap_fault, |
Kirill A. Shutemov | f182036 | 2014-04-07 15:37:19 -0700 | [diff] [blame] | 323 | .map_pages = filemap_map_pages, |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 324 | .page_mkwrite = ext4_page_mkwrite, |
| 325 | }; |
| 326 | |
| 327 | static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 328 | { |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 329 | struct inode *inode = file->f_mapping->host; |
| 330 | |
| 331 | if (ext4_encrypted_inode(inode)) { |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 332 | int err = ext4_get_encryption_info(inode); |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 333 | if (err) |
| 334 | return 0; |
Theodore Ts'o | abdd438 | 2015-05-31 13:35:39 -0400 | [diff] [blame] | 335 | if (ext4_encryption_info(inode) == NULL) |
| 336 | return -ENOKEY; |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 337 | } |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 338 | file_accessed(file); |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 339 | if (IS_DAX(file_inode(file))) { |
| 340 | vma->vm_ops = &ext4_dax_vm_ops; |
Matthew Wilcox | 11bd1a9 | 2015-09-08 14:59:03 -0700 | [diff] [blame] | 341 | vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 342 | } else { |
| 343 | vma->vm_ops = &ext4_file_vm_ops; |
| 344 | } |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 345 | return 0; |
| 346 | } |
| 347 | |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 348 | static int ext4_file_open(struct inode * inode, struct file * filp) |
| 349 | { |
| 350 | struct super_block *sb = inode->i_sb; |
| 351 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 352 | struct vfsmount *mnt = filp->f_path.mnt; |
| 353 | struct path path; |
| 354 | char buf[64], *cp; |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 355 | int ret; |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 356 | |
| 357 | if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && |
| 358 | !(sb->s_flags & MS_RDONLY))) { |
| 359 | sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; |
| 360 | /* |
| 361 | * Sample where the filesystem has been mounted and |
| 362 | * store it in the superblock for sysadmin convenience |
| 363 | * when trying to sort through large numbers of block |
| 364 | * devices or filesystem images. |
| 365 | */ |
| 366 | memset(buf, 0, sizeof(buf)); |
Al Viro | 3899167 | 2010-01-23 20:10:29 -0500 | [diff] [blame] | 367 | path.mnt = mnt; |
| 368 | path.dentry = mnt->mnt_root; |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 369 | cp = d_path(&path, buf, sizeof(buf)); |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 370 | if (!IS_ERR(cp)) { |
Jan Kara | 044ce47 | 2012-07-22 20:31:31 -0400 | [diff] [blame] | 371 | handle_t *handle; |
| 372 | int err; |
| 373 | |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 374 | handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); |
Jan Kara | 044ce47 | 2012-07-22 20:31:31 -0400 | [diff] [blame] | 375 | if (IS_ERR(handle)) |
| 376 | return PTR_ERR(handle); |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 377 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
Jan Kara | 044ce47 | 2012-07-22 20:31:31 -0400 | [diff] [blame] | 378 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
| 379 | if (err) { |
| 380 | ext4_journal_stop(handle); |
| 381 | return err; |
| 382 | } |
Darrick J. Wong | cf80390 | 2011-10-25 09:18:41 -0400 | [diff] [blame] | 383 | strlcpy(sbi->s_es->s_last_mounted, cp, |
| 384 | sizeof(sbi->s_es->s_last_mounted)); |
Jan Kara | 044ce47 | 2012-07-22 20:31:31 -0400 | [diff] [blame] | 385 | ext4_handle_dirty_super(handle, sb); |
| 386 | ext4_journal_stop(handle); |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 387 | } |
| 388 | } |
Theodore Ts'o | abdd438 | 2015-05-31 13:35:39 -0400 | [diff] [blame] | 389 | if (ext4_encrypted_inode(inode)) { |
| 390 | ret = ext4_get_encryption_info(inode); |
| 391 | if (ret) |
| 392 | return -EACCES; |
| 393 | if (ext4_encryption_info(inode) == NULL) |
| 394 | return -ENOKEY; |
| 395 | } |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 396 | /* |
| 397 | * Set up the jbd2_inode if we are opening the inode for |
| 398 | * writing and the journal is present |
| 399 | */ |
Jan Kara | a361293 | 2013-08-16 21:19:41 -0400 | [diff] [blame] | 400 | if (filp->f_mode & FMODE_WRITE) { |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 401 | ret = ext4_inode_attach_jinode(inode); |
Jan Kara | a361293 | 2013-08-16 21:19:41 -0400 | [diff] [blame] | 402 | if (ret < 0) |
| 403 | return ret; |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 404 | } |
Theodore Ts'o | abdd438 | 2015-05-31 13:35:39 -0400 | [diff] [blame] | 405 | return dquot_file_open(inode, filp); |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 406 | } |
| 407 | |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 408 | /* |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 409 | * Here we use ext4_map_blocks() to get a block mapping for a extent-based |
| 410 | * file rather than ext4_ext_walk_space() because we can introduce |
| 411 | * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same |
| 412 | * function. When extent status tree has been fully implemented, it will |
| 413 | * track all extent status for a file and we can directly use it to |
| 414 | * retrieve the offset for SEEK_DATA/SEEK_HOLE. |
| 415 | */ |
| 416 | |
| 417 | /* |
| 418 | * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to |
| 419 | * lookup page cache to check whether or not there has some data between |
| 420 | * [startoff, endoff] because, if this range contains an unwritten extent, |
| 421 | * we determine this extent as a data or a hole according to whether the |
| 422 | * page cache has data or not. |
| 423 | */ |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 424 | static int ext4_find_unwritten_pgoff(struct inode *inode, |
| 425 | int whence, |
| 426 | struct ext4_map_blocks *map, |
| 427 | loff_t *offset) |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 428 | { |
| 429 | struct pagevec pvec; |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 430 | unsigned int blkbits; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 431 | pgoff_t index; |
| 432 | pgoff_t end; |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 433 | loff_t endoff; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 434 | loff_t startoff; |
| 435 | loff_t lastoff; |
| 436 | int found = 0; |
| 437 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 438 | blkbits = inode->i_sb->s_blocksize_bits; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 439 | startoff = *offset; |
| 440 | lastoff = startoff; |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 441 | endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 442 | |
| 443 | index = startoff >> PAGE_CACHE_SHIFT; |
| 444 | end = endoff >> PAGE_CACHE_SHIFT; |
| 445 | |
| 446 | pagevec_init(&pvec, 0); |
| 447 | do { |
| 448 | int i, num; |
| 449 | unsigned long nr_pages; |
| 450 | |
| 451 | num = min_t(pgoff_t, end - index, PAGEVEC_SIZE); |
| 452 | nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index, |
| 453 | (pgoff_t)num); |
| 454 | if (nr_pages == 0) { |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 455 | if (whence == SEEK_DATA) |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 456 | break; |
| 457 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 458 | BUG_ON(whence != SEEK_HOLE); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 459 | /* |
| 460 | * If this is the first time to go into the loop and |
| 461 | * offset is not beyond the end offset, it will be a |
| 462 | * hole at this offset |
| 463 | */ |
| 464 | if (lastoff == startoff || lastoff < endoff) |
| 465 | found = 1; |
| 466 | break; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * If this is the first time to go into the loop and |
| 471 | * offset is smaller than the first page offset, it will be a |
| 472 | * hole at this offset. |
| 473 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 474 | if (lastoff == startoff && whence == SEEK_HOLE && |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 475 | lastoff < page_offset(pvec.pages[0])) { |
| 476 | found = 1; |
| 477 | break; |
| 478 | } |
| 479 | |
| 480 | for (i = 0; i < nr_pages; i++) { |
| 481 | struct page *page = pvec.pages[i]; |
| 482 | struct buffer_head *bh, *head; |
| 483 | |
| 484 | /* |
| 485 | * If the current offset is not beyond the end of given |
| 486 | * range, it will be a hole. |
| 487 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 488 | if (lastoff < endoff && whence == SEEK_HOLE && |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 489 | page->index > end) { |
| 490 | found = 1; |
| 491 | *offset = lastoff; |
| 492 | goto out; |
| 493 | } |
| 494 | |
| 495 | lock_page(page); |
| 496 | |
| 497 | if (unlikely(page->mapping != inode->i_mapping)) { |
| 498 | unlock_page(page); |
| 499 | continue; |
| 500 | } |
| 501 | |
| 502 | if (!page_has_buffers(page)) { |
| 503 | unlock_page(page); |
| 504 | continue; |
| 505 | } |
| 506 | |
| 507 | if (page_has_buffers(page)) { |
| 508 | lastoff = page_offset(page); |
| 509 | bh = head = page_buffers(page); |
| 510 | do { |
| 511 | if (buffer_uptodate(bh) || |
| 512 | buffer_unwritten(bh)) { |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 513 | if (whence == SEEK_DATA) |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 514 | found = 1; |
| 515 | } else { |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 516 | if (whence == SEEK_HOLE) |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 517 | found = 1; |
| 518 | } |
| 519 | if (found) { |
| 520 | *offset = max_t(loff_t, |
| 521 | startoff, lastoff); |
| 522 | unlock_page(page); |
| 523 | goto out; |
| 524 | } |
| 525 | lastoff += bh->b_size; |
| 526 | bh = bh->b_this_page; |
| 527 | } while (bh != head); |
| 528 | } |
| 529 | |
| 530 | lastoff = page_offset(page) + PAGE_SIZE; |
| 531 | unlock_page(page); |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * The no. of pages is less than our desired, that would be a |
| 536 | * hole in there. |
| 537 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 538 | if (nr_pages < num && whence == SEEK_HOLE) { |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 539 | found = 1; |
| 540 | *offset = lastoff; |
| 541 | break; |
| 542 | } |
| 543 | |
| 544 | index = pvec.pages[i - 1]->index + 1; |
| 545 | pagevec_release(&pvec); |
| 546 | } while (index <= end); |
| 547 | |
| 548 | out: |
| 549 | pagevec_release(&pvec); |
| 550 | return found; |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * ext4_seek_data() retrieves the offset for SEEK_DATA. |
| 555 | */ |
| 556 | static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize) |
| 557 | { |
| 558 | struct inode *inode = file->f_mapping->host; |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 559 | struct ext4_map_blocks map; |
| 560 | struct extent_status es; |
| 561 | ext4_lblk_t start, last, end; |
| 562 | loff_t dataoff, isize; |
| 563 | int blkbits; |
| 564 | int ret = 0; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 565 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 566 | inode_lock(inode); |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 567 | |
| 568 | isize = i_size_read(inode); |
| 569 | if (offset >= isize) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 570 | inode_unlock(inode); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 571 | return -ENXIO; |
| 572 | } |
| 573 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 574 | blkbits = inode->i_sb->s_blocksize_bits; |
| 575 | start = offset >> blkbits; |
| 576 | last = start; |
| 577 | end = isize >> blkbits; |
| 578 | dataoff = offset; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 579 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 580 | do { |
| 581 | map.m_lblk = last; |
| 582 | map.m_len = end - last + 1; |
| 583 | ret = ext4_map_blocks(NULL, inode, &map, 0); |
| 584 | if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) { |
| 585 | if (last != start) |
| 586 | dataoff = (loff_t)last << blkbits; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 587 | break; |
| 588 | } |
| 589 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 590 | /* |
| 591 | * If there is a delay extent at this offset, |
| 592 | * it will be as a data. |
| 593 | */ |
| 594 | ext4_es_find_delayed_extent_range(inode, last, last, &es); |
| 595 | if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) { |
| 596 | if (last != start) |
| 597 | dataoff = (loff_t)last << blkbits; |
| 598 | break; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 599 | } |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 600 | |
| 601 | /* |
| 602 | * If there is a unwritten extent at this offset, |
| 603 | * it will be as a data or a hole according to page |
| 604 | * cache that has data or not. |
| 605 | */ |
| 606 | if (map.m_flags & EXT4_MAP_UNWRITTEN) { |
| 607 | int unwritten; |
| 608 | unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA, |
| 609 | &map, &dataoff); |
| 610 | if (unwritten) |
| 611 | break; |
| 612 | } |
| 613 | |
| 614 | last++; |
| 615 | dataoff = (loff_t)last << blkbits; |
| 616 | } while (last <= end); |
| 617 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 618 | inode_unlock(inode); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 619 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 620 | if (dataoff > isize) |
| 621 | return -ENXIO; |
| 622 | |
| 623 | return vfs_setpos(file, dataoff, maxsize); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | /* |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 627 | * ext4_seek_hole() retrieves the offset for SEEK_HOLE. |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 628 | */ |
| 629 | static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize) |
| 630 | { |
| 631 | struct inode *inode = file->f_mapping->host; |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 632 | struct ext4_map_blocks map; |
| 633 | struct extent_status es; |
| 634 | ext4_lblk_t start, last, end; |
| 635 | loff_t holeoff, isize; |
| 636 | int blkbits; |
| 637 | int ret = 0; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 638 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 639 | inode_lock(inode); |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 640 | |
| 641 | isize = i_size_read(inode); |
| 642 | if (offset >= isize) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 643 | inode_unlock(inode); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 644 | return -ENXIO; |
| 645 | } |
| 646 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 647 | blkbits = inode->i_sb->s_blocksize_bits; |
| 648 | start = offset >> blkbits; |
| 649 | last = start; |
| 650 | end = isize >> blkbits; |
| 651 | holeoff = offset; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 652 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 653 | do { |
| 654 | map.m_lblk = last; |
| 655 | map.m_len = end - last + 1; |
| 656 | ret = ext4_map_blocks(NULL, inode, &map, 0); |
| 657 | if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) { |
| 658 | last += ret; |
| 659 | holeoff = (loff_t)last << blkbits; |
| 660 | continue; |
| 661 | } |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 662 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 663 | /* |
| 664 | * If there is a delay extent at this offset, |
| 665 | * we will skip this extent. |
| 666 | */ |
| 667 | ext4_es_find_delayed_extent_range(inode, last, last, &es); |
| 668 | if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) { |
| 669 | last = es.es_lblk + es.es_len; |
| 670 | holeoff = (loff_t)last << blkbits; |
| 671 | continue; |
| 672 | } |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 673 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 674 | /* |
| 675 | * If there is a unwritten extent at this offset, |
| 676 | * it will be as a data or a hole according to page |
| 677 | * cache that has data or not. |
| 678 | */ |
| 679 | if (map.m_flags & EXT4_MAP_UNWRITTEN) { |
| 680 | int unwritten; |
| 681 | unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE, |
| 682 | &map, &holeoff); |
| 683 | if (!unwritten) { |
| 684 | last += ret; |
| 685 | holeoff = (loff_t)last << blkbits; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 686 | continue; |
| 687 | } |
| 688 | } |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 689 | |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 690 | /* find a hole */ |
| 691 | break; |
| 692 | } while (last <= end); |
| 693 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 694 | inode_unlock(inode); |
Theodore Ts'o | ad7fefb | 2015-01-02 15:16:00 -0500 | [diff] [blame] | 695 | |
| 696 | if (holeoff > isize) |
| 697 | holeoff = isize; |
| 698 | |
| 699 | return vfs_setpos(file, holeoff, maxsize); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | /* |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 703 | * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values |
| 704 | * by calling generic_file_llseek_size() with the appropriate maxbytes |
| 705 | * value for each. |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 706 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 707 | loff_t ext4_llseek(struct file *file, loff_t offset, int whence) |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 708 | { |
| 709 | struct inode *inode = file->f_mapping->host; |
| 710 | loff_t maxbytes; |
| 711 | |
| 712 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| 713 | maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes; |
| 714 | else |
| 715 | maxbytes = inode->i_sb->s_maxbytes; |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 716 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 717 | switch (whence) { |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 718 | case SEEK_SET: |
| 719 | case SEEK_CUR: |
| 720 | case SEEK_END: |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 721 | return generic_file_llseek_size(file, offset, whence, |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 722 | maxbytes, i_size_read(inode)); |
| 723 | case SEEK_DATA: |
| 724 | return ext4_seek_data(file, offset, maxbytes); |
| 725 | case SEEK_HOLE: |
| 726 | return ext4_seek_hole(file, offset, maxbytes); |
| 727 | } |
| 728 | |
| 729 | return -EINVAL; |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 730 | } |
| 731 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 732 | const struct file_operations ext4_file_operations = { |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 733 | .llseek = ext4_llseek, |
Al Viro | aad4f8b | 2014-04-02 14:33:16 -0400 | [diff] [blame] | 734 | .read_iter = generic_file_read_iter, |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 735 | .write_iter = ext4_file_write_iter, |
Andi Kleen | 5cdd7b2 | 2008-04-29 22:03:54 -0400 | [diff] [blame] | 736 | .unlocked_ioctl = ext4_ioctl, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 737 | #ifdef CONFIG_COMPAT |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 738 | .compat_ioctl = ext4_compat_ioctl, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 739 | #endif |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 740 | .mmap = ext4_file_mmap, |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 741 | .open = ext4_file_open, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 742 | .release = ext4_release_file, |
| 743 | .fsync = ext4_sync_file, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 744 | .splice_read = generic_file_splice_read, |
Al Viro | 8d02076 | 2014-04-05 04:27:08 -0400 | [diff] [blame] | 745 | .splice_write = iter_file_splice_write, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 746 | .fallocate = ext4_fallocate, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 747 | }; |
| 748 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 749 | const struct inode_operations ext4_file_inode_operations = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 750 | .setattr = ext4_setattr, |
Mingming Cao | 3e3398a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 751 | .getattr = ext4_getattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 752 | .setxattr = generic_setxattr, |
| 753 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 754 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 755 | .removexattr = generic_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 756 | .get_acl = ext4_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 757 | .set_acl = ext4_set_acl, |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 758 | .fiemap = ext4_fiemap, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 759 | }; |
| 760 | |