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