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 */
ext3_release_file(struct inode * inode,struct file * filp)34 static int ext3_release_file (struct inode * inode, struct file * filp)
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 {
40 mutex_lock(&EXT3_I(inode)->truncate_mutex);
41 ext3_discard_reservation(inode);
42 mutex_unlock(&EXT3_I(inode)->truncate_mutex);
43 }
44 if (is_dx(inode) && filp->private_data)
45 ext3_htree_free_dir_info(filp->private_data);
46
47 return 0;
48 }
49
50 static ssize_t
ext3_file_write(struct kiocb * iocb,const struct iovec * iov,unsigned long nr_segs,loff_t pos)51 ext3_file_write(struct kiocb *iocb, const struct iovec *iov,
52 unsigned long nr_segs, loff_t pos)
53 {
54 struct file *file = iocb->ki_filp;
55 struct inode *inode = file->f_path.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 */
82 if (!ext3_should_journal_data(inode))
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:
103 err = ext3_force_commit(inode->i_sb);
104 if (err)
105 return err;
106 return ret;
107 }
108
109 const struct file_operations ext3_file_operations = {
110 .llseek = generic_file_llseek,
111 .read = do_sync_read,
112 .write = do_sync_write,
113 .aio_read = generic_file_aio_read,
114 .aio_write = ext3_file_write,
115 .ioctl = ext3_ioctl,
116 #ifdef CONFIG_COMPAT
117 .compat_ioctl = ext3_compat_ioctl,
118 #endif
119 .mmap = generic_file_mmap,
120 .open = generic_file_open,
121 .release = ext3_release_file,
122 .fsync = ext3_sync_file,
123 .splice_read = generic_file_splice_read,
124 .splice_write = generic_file_splice_write,
125 };
126
127 const struct inode_operations ext3_file_inode_operations = {
128 .truncate = ext3_truncate,
129 .setattr = ext3_setattr,
130 #ifdef CONFIG_EXT3_FS_XATTR
131 .setxattr = generic_setxattr,
132 .getxattr = generic_getxattr,
133 .listxattr = ext3_listxattr,
134 .removexattr = generic_removexattr,
135 #endif
136 .permission = ext3_permission,
137 .fiemap = ext3_fiemap,
138 };
139
140