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 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 ext3_discard_reservation(inode);
40 if (is_dx(inode) && filp->private_data)
41 ext3_htree_free_dir_info(filp->private_data);
47 * Called when an inode is about to be opened.
48 * We use this to disallow opening RW large files on 32bit systems if
49 * the caller didn't specify O_LARGEFILE. On 64bit systems we force
50 * on this flag in sys_open.
52 static int ext3_open_file (struct inode *inode, struct file *filp)
54 if (!(filp->f_flags & O_LARGEFILE) &&
55 inode->i_size > 0x7FFFFFFFLL)
61 ext3_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
63 struct file *file = iocb->ki_filp;
64 struct inode *inode = file->f_dentry->d_inode;
68 ret = generic_file_aio_write(iocb, buf, count, pos);
71 * Skip flushing if there was an error, or if nothing was written.
77 * If the inode is IS_SYNC, or is O_SYNC and we are doing data
78 * journalling then we need to make sure that we force the transaction
79 * to disk to keep all metadata uptodate synchronously.
81 if (file->f_flags & O_SYNC) {
83 * If we are non-data-journaled, then the dirty data has
84 * already been flushed to backing store by generic_osync_inode,
85 * and the inode has been flushed too if there have been any
86 * modifications other than mere timestamp updates.
88 * Open question --- do we care about flushing timestamps too
89 * if the inode is IS_SYNC?
91 if (!ext3_should_journal_data(inode))
98 * So we know that there has been no forced data flush. If the inode
99 * is marked IS_SYNC, we need to force one ourselves.
105 * Open question #2 --- should we force data to disk here too? If we
106 * don't, the only impact is that data=writeback filesystems won't
107 * flush data to disk automatically on IS_SYNC, only metadata (but
108 * historically, that is what ext2 has done.)
112 err = ext3_force_commit(inode->i_sb);
118 struct file_operations ext3_file_operations = {
119 .llseek = generic_file_llseek,
120 .read = do_sync_read,
121 .write = do_sync_write,
122 .aio_read = generic_file_aio_read,
123 .aio_write = ext3_file_write,
124 .readv = generic_file_readv,
125 .writev = generic_file_writev,
127 .mmap = generic_file_mmap,
128 .open = ext3_open_file,
129 .release = ext3_release_file,
130 .fsync = ext3_sync_file,
131 .sendfile = generic_file_sendfile,
134 struct inode_operations ext3_file_inode_operations = {
135 .truncate = ext3_truncate,
136 .setattr = ext3_setattr,
137 .setxattr = ext3_setxattr,
138 .getxattr = ext3_getxattr,
139 .listxattr = ext3_listxattr,
140 .removexattr = ext3_removexattr,
141 .permission = ext3_permission,