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)
11 * linux/fs/minix/file.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * ext3 fs regular file handling primitives
17 * 64-bit file support on 64-bit platforms by Jakub Jelinek
18 * (jj@sunsite.ms.mff.cuni.cz)
21 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
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.
34 static int ext3_release_file (struct inode * inode, struct file * filp)
36 if (filp->f_mode & FMODE_WRITE)
37 ext3_discard_prealloc (inode);
38 if (is_dx(inode) && filp->private_data)
39 ext3_htree_free_dir_info(filp->private_data);
45 * Called when an inode is about to be opened.
46 * We use this to disallow opening RW large files on 32bit systems if
47 * the caller didn't specify O_LARGEFILE. On 64bit systems we force
48 * on this flag in sys_open.
50 static int ext3_open_file (struct inode *inode, struct file *filp)
52 if (!(filp->f_flags & O_LARGEFILE) &&
53 inode->i_size > 0x7FFFFFFFLL)
59 ext3_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
61 struct file *file = iocb->ki_filp;
62 struct inode *inode = file->f_dentry->d_inode;
66 ret = generic_file_aio_write(iocb, buf, count, pos);
69 * Skip flushing if there was an error, or if nothing was written.
75 * If the inode is IS_SYNC, or is O_SYNC and we are doing data
76 * journalling then we need to make sure that we force the transaction
77 * to disk to keep all metadata uptodate synchronously.
79 if (file->f_flags & O_SYNC) {
81 * If we are non-data-journaled, then the dirty data has
82 * already been flushed to backing store by generic_osync_inode,
83 * and the inode has been flushed too if there have been any
84 * modifications other than mere timestamp updates.
86 * Open question --- do we care about flushing timestamps too
87 * if the inode is IS_SYNC?
89 if (!ext3_should_journal_data(inode))
96 * So we know that there has been no forced data flush. If the inode
97 * is marked IS_SYNC, we need to force one ourselves.
103 * Open question #2 --- should we force data to disk here too? If we
104 * don't, the only impact is that data=writeback filesystems won't
105 * flush data to disk automatically on IS_SYNC, only metadata (but
106 * historically, that is what ext2 has done.)
110 err = ext3_force_commit(inode->i_sb);
116 struct file_operations ext3_file_operations = {
117 .llseek = generic_file_llseek,
118 .read = do_sync_read,
119 .write = do_sync_write,
120 .aio_read = generic_file_aio_read,
121 .aio_write = ext3_file_write,
122 .readv = generic_file_readv,
123 .writev = generic_file_writev,
125 .mmap = generic_file_mmap,
126 .open = ext3_open_file,
127 .release = ext3_release_file,
128 .fsync = ext3_sync_file,
129 .sendfile = generic_file_sendfile,
132 struct inode_operations ext3_file_inode_operations = {
133 .truncate = ext3_truncate,
134 .setattr = ext3_setattr,
135 .setxattr = ext3_setxattr,
136 .getxattr = ext3_getxattr,
137 .listxattr = ext3_listxattr,
138 .removexattr = ext3_removexattr,
139 .permission = ext3_permission,