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Linux kernel mirror (for testing)
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1/*
2 * linux/fs/ext3/file.c
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 *
15 * ext3 fs regular file handling primitives
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>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include "xattr.h"
27#include "acl.h"
28
29/*
30 * Called when an inode is released. Note that this is different
31 * from ext3_file_open: open gets called at every open, but release
32 * gets called only when /all/ the files are closed.
33 */
34static int ext3_release_file (struct inode * inode, struct file * filp)
35{
36 if (EXT3_I(inode)->i_state & EXT3_STATE_FLUSH_ON_CLOSE) {
37 filemap_flush(inode->i_mapping);
38 EXT3_I(inode)->i_state &= ~EXT3_STATE_FLUSH_ON_CLOSE;
39 }
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 {
44 mutex_lock(&EXT3_I(inode)->truncate_mutex);
45 ext3_discard_reservation(inode);
46 mutex_unlock(&EXT3_I(inode)->truncate_mutex);
47 }
48 if (is_dx(inode) && filp->private_data)
49 ext3_htree_free_dir_info(filp->private_data);
50
51 return 0;
52}
53
54static ssize_t
55ext3_file_write(struct kiocb *iocb, const struct iovec *iov,
56 unsigned long nr_segs, loff_t pos)
57{
58 struct file *file = iocb->ki_filp;
59 struct inode *inode = file->f_path.dentry->d_inode;
60 ssize_t ret;
61 int err;
62
63 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
64
65 /*
66 * Skip flushing if there was an error, or if nothing was written.
67 */
68 if (ret <= 0)
69 return ret;
70
71 /*
72 * If the inode is IS_SYNC, or is O_SYNC and we are doing data
73 * journalling then we need to make sure that we force the transaction
74 * to disk to keep all metadata uptodate synchronously.
75 */
76 if (file->f_flags & O_SYNC) {
77 /*
78 * If we are non-data-journaled, then the dirty data has
79 * already been flushed to backing store by generic_osync_inode,
80 * and the inode has been flushed too if there have been any
81 * modifications other than mere timestamp updates.
82 *
83 * Open question --- do we care about flushing timestamps too
84 * if the inode is IS_SYNC?
85 */
86 if (!ext3_should_journal_data(inode))
87 return ret;
88
89 goto force_commit;
90 }
91
92 /*
93 * So we know that there has been no forced data flush. If the inode
94 * is marked IS_SYNC, we need to force one ourselves.
95 */
96 if (!IS_SYNC(inode))
97 return ret;
98
99 /*
100 * Open question #2 --- should we force data to disk here too? If we
101 * don't, the only impact is that data=writeback filesystems won't
102 * flush data to disk automatically on IS_SYNC, only metadata (but
103 * historically, that is what ext2 has done.)
104 */
105
106force_commit:
107 err = ext3_force_commit(inode->i_sb);
108 if (err)
109 return err;
110 return ret;
111}
112
113const struct file_operations ext3_file_operations = {
114 .llseek = generic_file_llseek,
115 .read = do_sync_read,
116 .write = do_sync_write,
117 .aio_read = generic_file_aio_read,
118 .aio_write = ext3_file_write,
119 .unlocked_ioctl = ext3_ioctl,
120#ifdef CONFIG_COMPAT
121 .compat_ioctl = ext3_compat_ioctl,
122#endif
123 .mmap = generic_file_mmap,
124 .open = generic_file_open,
125 .release = ext3_release_file,
126 .fsync = ext3_sync_file,
127 .splice_read = generic_file_splice_read,
128 .splice_write = generic_file_splice_write,
129};
130
131const struct inode_operations ext3_file_inode_operations = {
132 .truncate = ext3_truncate,
133 .setattr = ext3_setattr,
134#ifdef CONFIG_EXT3_FS_XATTR
135 .setxattr = generic_setxattr,
136 .getxattr = generic_getxattr,
137 .listxattr = ext3_listxattr,
138 .removexattr = generic_removexattr,
139#endif
140 .permission = ext3_permission,
141 .fiemap = ext3_fiemap,
142};
143