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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/file.c |
ac27a0ec DK |
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 | * | |
617ba13b | 15 | * ext4 fs regular file handling primitives |
ac27a0ec DK |
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> | |
dab291af | 23 | #include <linux/jbd2.h> |
3dcf5451 CH |
24 | #include "ext4.h" |
25 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
26 | #include "xattr.h" |
27 | #include "acl.h" | |
28 | ||
29 | /* | |
30 | * Called when an inode is released. Note that this is different | |
617ba13b | 31 | * from ext4_file_open: open gets called at every open, but release |
ac27a0ec DK |
32 | * gets called only when /all/ the files are closed. |
33 | */ | |
af5bc92d | 34 | static int ext4_release_file(struct inode *inode, struct file *filp) |
ac27a0ec | 35 | { |
7d8f9f7d TT |
36 | if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) { |
37 | ext4_alloc_da_blocks(inode); | |
38 | EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE; | |
39 | } | |
ac27a0ec DK |
40 | /* if we are the last writer on the inode, drop the block reservation */ |
41 | if ((filp->f_mode & FMODE_WRITE) && | |
d6014301 AK |
42 | (atomic_read(&inode->i_writecount) == 1) && |
43 | !EXT4_I(inode)->i_reserved_data_blocks) | |
ac27a0ec | 44 | { |
0e855ac8 | 45 | down_write(&EXT4_I(inode)->i_data_sem); |
c2ea3fde | 46 | ext4_discard_preallocations(inode); |
0e855ac8 | 47 | up_write(&EXT4_I(inode)->i_data_sem); |
ac27a0ec DK |
48 | } |
49 | if (is_dx(inode) && filp->private_data) | |
617ba13b | 50 | ext4_htree_free_dir_info(filp->private_data); |
ac27a0ec DK |
51 | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static ssize_t | |
617ba13b | 56 | ext4_file_write(struct kiocb *iocb, const struct iovec *iov, |
ac27a0ec DK |
57 | unsigned long nr_segs, loff_t pos) |
58 | { | |
59 | struct file *file = iocb->ki_filp; | |
9d549890 | 60 | struct inode *inode = file->f_path.dentry->d_inode; |
ac27a0ec DK |
61 | ssize_t ret; |
62 | int err; | |
63 | ||
e2b46574 ES |
64 | /* |
65 | * If we have encountered a bitmap-format file, the size limit | |
66 | * is smaller than s_maxbytes, which is for extent-mapped files. | |
67 | */ | |
68 | ||
69 | if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) { | |
70 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
71 | size_t length = iov_length(iov, nr_segs); | |
ac27a0ec | 72 | |
e2b46574 ES |
73 | if (pos > sbi->s_bitmap_maxbytes) |
74 | return -EFBIG; | |
75 | ||
76 | if (pos + length > sbi->s_bitmap_maxbytes) { | |
77 | nr_segs = iov_shorten((struct iovec *)iov, nr_segs, | |
78 | sbi->s_bitmap_maxbytes - pos); | |
79 | } | |
80 | } | |
81 | ||
82 | ret = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
ac27a0ec DK |
83 | /* |
84 | * Skip flushing if there was an error, or if nothing was written. | |
85 | */ | |
86 | if (ret <= 0) | |
87 | return ret; | |
88 | ||
89 | /* | |
90 | * If the inode is IS_SYNC, or is O_SYNC and we are doing data | |
91 | * journalling then we need to make sure that we force the transaction | |
92 | * to disk to keep all metadata uptodate synchronously. | |
93 | */ | |
94 | if (file->f_flags & O_SYNC) { | |
95 | /* | |
96 | * If we are non-data-journaled, then the dirty data has | |
97 | * already been flushed to backing store by generic_osync_inode, | |
98 | * and the inode has been flushed too if there have been any | |
99 | * modifications other than mere timestamp updates. | |
100 | * | |
101 | * Open question --- do we care about flushing timestamps too | |
102 | * if the inode is IS_SYNC? | |
103 | */ | |
617ba13b | 104 | if (!ext4_should_journal_data(inode)) |
ac27a0ec DK |
105 | return ret; |
106 | ||
107 | goto force_commit; | |
108 | } | |
109 | ||
110 | /* | |
111 | * So we know that there has been no forced data flush. If the inode | |
112 | * is marked IS_SYNC, we need to force one ourselves. | |
113 | */ | |
114 | if (!IS_SYNC(inode)) | |
115 | return ret; | |
116 | ||
117 | /* | |
118 | * Open question #2 --- should we force data to disk here too? If we | |
119 | * don't, the only impact is that data=writeback filesystems won't | |
120 | * flush data to disk automatically on IS_SYNC, only metadata (but | |
121 | * historically, that is what ext2 has done.) | |
122 | */ | |
123 | ||
124 | force_commit: | |
617ba13b | 125 | err = ext4_force_commit(inode->i_sb); |
ac27a0ec DK |
126 | if (err) |
127 | return err; | |
128 | return ret; | |
129 | } | |
130 | ||
2e9ee850 AK |
131 | static struct vm_operations_struct ext4_file_vm_ops = { |
132 | .fault = filemap_fault, | |
133 | .page_mkwrite = ext4_page_mkwrite, | |
134 | }; | |
135 | ||
136 | static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) | |
137 | { | |
138 | struct address_space *mapping = file->f_mapping; | |
139 | ||
140 | if (!mapping->a_ops->readpage) | |
141 | return -ENOEXEC; | |
142 | file_accessed(file); | |
143 | vma->vm_ops = &ext4_file_vm_ops; | |
144 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
145 | return 0; | |
146 | } | |
147 | ||
617ba13b | 148 | const struct file_operations ext4_file_operations = { |
ac27a0ec DK |
149 | .llseek = generic_file_llseek, |
150 | .read = do_sync_read, | |
151 | .write = do_sync_write, | |
152 | .aio_read = generic_file_aio_read, | |
617ba13b | 153 | .aio_write = ext4_file_write, |
5cdd7b2d | 154 | .unlocked_ioctl = ext4_ioctl, |
ac27a0ec | 155 | #ifdef CONFIG_COMPAT |
617ba13b | 156 | .compat_ioctl = ext4_compat_ioctl, |
ac27a0ec | 157 | #endif |
2e9ee850 | 158 | .mmap = ext4_file_mmap, |
ac27a0ec | 159 | .open = generic_file_open, |
617ba13b MC |
160 | .release = ext4_release_file, |
161 | .fsync = ext4_sync_file, | |
ac27a0ec DK |
162 | .splice_read = generic_file_splice_read, |
163 | .splice_write = generic_file_splice_write, | |
164 | }; | |
165 | ||
754661f1 | 166 | const struct inode_operations ext4_file_inode_operations = { |
617ba13b MC |
167 | .truncate = ext4_truncate, |
168 | .setattr = ext4_setattr, | |
3e3398a0 | 169 | .getattr = ext4_getattr, |
03010a33 | 170 | #ifdef CONFIG_EXT4_FS_XATTR |
ac27a0ec DK |
171 | .setxattr = generic_setxattr, |
172 | .getxattr = generic_getxattr, | |
617ba13b | 173 | .listxattr = ext4_listxattr, |
ac27a0ec DK |
174 | .removexattr = generic_removexattr, |
175 | #endif | |
617ba13b | 176 | .permission = ext4_permission, |
a2df2a63 | 177 | .fallocate = ext4_fallocate, |
6873fa0d | 178 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
179 | }; |
180 |