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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> |
617ba13b | 24 | #include <linux/ext4_fs.h> |
dab291af | 25 | #include <linux/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 | */ | |
617ba13b | 34 | static int ext4_release_file (struct inode * inode, struct file * filp) |
ac27a0ec DK |
35 | { |
36 | /* if we are the last writer on the inode, drop the block reservation */ | |
37 | if ((filp->f_mode & FMODE_WRITE) && | |
38 | (atomic_read(&inode->i_writecount) == 1)) | |
39 | { | |
617ba13b MC |
40 | mutex_lock(&EXT4_I(inode)->truncate_mutex); |
41 | ext4_discard_reservation(inode); | |
42 | mutex_unlock(&EXT4_I(inode)->truncate_mutex); | |
ac27a0ec DK |
43 | } |
44 | if (is_dx(inode) && filp->private_data) | |
617ba13b | 45 | ext4_htree_free_dir_info(filp->private_data); |
ac27a0ec DK |
46 | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static ssize_t | |
617ba13b | 51 | ext4_file_write(struct kiocb *iocb, const struct iovec *iov, |
ac27a0ec DK |
52 | unsigned long nr_segs, loff_t pos) |
53 | { | |
54 | struct file *file = iocb->ki_filp; | |
9d549890 | 55 | struct inode *inode = file->f_path.dentry->d_inode; |
ac27a0ec DK |
56 | ssize_t ret; |
57 | int err; | |
58 | ||
59 | ret = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
60 | ||
61 | /* | |
62 | * Skip flushing if there was an error, or if nothing was written. | |
63 | */ | |
64 | if (ret <= 0) | |
65 | return ret; | |
66 | ||
67 | /* | |
68 | * If the inode is IS_SYNC, or is O_SYNC and we are doing data | |
69 | * journalling then we need to make sure that we force the transaction | |
70 | * to disk to keep all metadata uptodate synchronously. | |
71 | */ | |
72 | if (file->f_flags & O_SYNC) { | |
73 | /* | |
74 | * If we are non-data-journaled, then the dirty data has | |
75 | * already been flushed to backing store by generic_osync_inode, | |
76 | * and the inode has been flushed too if there have been any | |
77 | * modifications other than mere timestamp updates. | |
78 | * | |
79 | * Open question --- do we care about flushing timestamps too | |
80 | * if the inode is IS_SYNC? | |
81 | */ | |
617ba13b | 82 | if (!ext4_should_journal_data(inode)) |
ac27a0ec DK |
83 | return ret; |
84 | ||
85 | goto force_commit; | |
86 | } | |
87 | ||
88 | /* | |
89 | * So we know that there has been no forced data flush. If the inode | |
90 | * is marked IS_SYNC, we need to force one ourselves. | |
91 | */ | |
92 | if (!IS_SYNC(inode)) | |
93 | return ret; | |
94 | ||
95 | /* | |
96 | * Open question #2 --- should we force data to disk here too? If we | |
97 | * don't, the only impact is that data=writeback filesystems won't | |
98 | * flush data to disk automatically on IS_SYNC, only metadata (but | |
99 | * historically, that is what ext2 has done.) | |
100 | */ | |
101 | ||
102 | force_commit: | |
617ba13b | 103 | err = ext4_force_commit(inode->i_sb); |
ac27a0ec DK |
104 | if (err) |
105 | return err; | |
106 | return ret; | |
107 | } | |
108 | ||
617ba13b | 109 | const struct file_operations ext4_file_operations = { |
ac27a0ec DK |
110 | .llseek = generic_file_llseek, |
111 | .read = do_sync_read, | |
112 | .write = do_sync_write, | |
113 | .aio_read = generic_file_aio_read, | |
617ba13b MC |
114 | .aio_write = ext4_file_write, |
115 | .ioctl = ext4_ioctl, | |
ac27a0ec | 116 | #ifdef CONFIG_COMPAT |
617ba13b | 117 | .compat_ioctl = ext4_compat_ioctl, |
ac27a0ec DK |
118 | #endif |
119 | .mmap = generic_file_mmap, | |
120 | .open = generic_file_open, | |
617ba13b MC |
121 | .release = ext4_release_file, |
122 | .fsync = ext4_sync_file, | |
ac27a0ec DK |
123 | .splice_read = generic_file_splice_read, |
124 | .splice_write = generic_file_splice_write, | |
125 | }; | |
126 | ||
754661f1 | 127 | const struct inode_operations ext4_file_inode_operations = { |
617ba13b MC |
128 | .truncate = ext4_truncate, |
129 | .setattr = ext4_setattr, | |
130 | #ifdef CONFIG_EXT4DEV_FS_XATTR | |
ac27a0ec DK |
131 | .setxattr = generic_setxattr, |
132 | .getxattr = generic_getxattr, | |
617ba13b | 133 | .listxattr = ext4_listxattr, |
ac27a0ec DK |
134 | .removexattr = generic_removexattr, |
135 | #endif | |
617ba13b | 136 | .permission = ext4_permission, |
a2df2a63 | 137 | .fallocate = ext4_fallocate, |
ac27a0ec DK |
138 | }; |
139 |