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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/file.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
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 Cao617ba132006-10-11 01:20:53 -070015 * ext4 fs regular file handling primitives
Dave Kleikampac27a0e2006-10-11 01:20:50 -070016 *
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>
Mingming Caodab291a2006-10-11 01:21:01 -070023#include <linux/jbd2.h>
Mingming Cao617ba132006-10-11 01:20:53 -070024#include <linux/ext4_fs.h>
Mingming Caodab291a2006-10-11 01:21:01 -070025#include <linux/ext4_jbd2.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070026#include "xattr.h"
27#include "acl.h"
28
29/*
30 * Called when an inode is released. Note that this is different
Mingming Cao617ba132006-10-11 01:20:53 -070031 * from ext4_file_open: open gets called at every open, but release
Dave Kleikampac27a0e2006-10-11 01:20:50 -070032 * gets called only when /all/ the files are closed.
33 */
Mingming Cao617ba132006-10-11 01:20:53 -070034static int ext4_release_file (struct inode * inode, struct file * filp)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070035{
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 {
Mingming Cao617ba132006-10-11 01:20:53 -070040 mutex_lock(&EXT4_I(inode)->truncate_mutex);
41 ext4_discard_reservation(inode);
42 mutex_unlock(&EXT4_I(inode)->truncate_mutex);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043 }
44 if (is_dx(inode) && filp->private_data)
Mingming Cao617ba132006-10-11 01:20:53 -070045 ext4_htree_free_dir_info(filp->private_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070046
47 return 0;
48}
49
50static ssize_t
Mingming Cao617ba132006-10-11 01:20:53 -070051ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070052 unsigned long nr_segs, loff_t pos)
53{
54 struct file *file = iocb->ki_filp;
55 struct inode *inode = file->f_dentry->d_inode;
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 */
Mingming Cao617ba132006-10-11 01:20:53 -070082 if (!ext4_should_journal_data(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070083 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
102force_commit:
Mingming Cao617ba132006-10-11 01:20:53 -0700103 err = ext4_force_commit(inode->i_sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700104 if (err)
105 return err;
106 return ret;
107}
108
Mingming Cao617ba132006-10-11 01:20:53 -0700109const struct file_operations ext4_file_operations = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700110 .llseek = generic_file_llseek,
111 .read = do_sync_read,
112 .write = do_sync_write,
113 .aio_read = generic_file_aio_read,
Mingming Cao617ba132006-10-11 01:20:53 -0700114 .aio_write = ext4_file_write,
115 .ioctl = ext4_ioctl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700116#ifdef CONFIG_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -0700117 .compat_ioctl = ext4_compat_ioctl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700118#endif
119 .mmap = generic_file_mmap,
120 .open = generic_file_open,
Mingming Cao617ba132006-10-11 01:20:53 -0700121 .release = ext4_release_file,
122 .fsync = ext4_sync_file,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700123 .sendfile = generic_file_sendfile,
124 .splice_read = generic_file_splice_read,
125 .splice_write = generic_file_splice_write,
126};
127
Mingming Cao617ba132006-10-11 01:20:53 -0700128struct inode_operations ext4_file_inode_operations = {
129 .truncate = ext4_truncate,
130 .setattr = ext4_setattr,
131#ifdef CONFIG_EXT4DEV_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700132 .setxattr = generic_setxattr,
133 .getxattr = generic_getxattr,
Mingming Cao617ba132006-10-11 01:20:53 -0700134 .listxattr = ext4_listxattr,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700135 .removexattr = generic_removexattr,
136#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700137 .permission = ext4_permission,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700138};
139