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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>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040024#include "ext4.h"
25#include "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 */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040034static 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 {
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -050040 down_write(&EXT4_I(inode)->i_data_sem);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -040041 ext4_discard_preallocations(inode);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -050042 up_write(&EXT4_I(inode)->i_data_sem);
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;
Josef "Jeff" Sipek9d549892006-12-08 02:36:38 -080055 struct inode *inode = file->f_path.dentry->d_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070056 ssize_t ret;
57 int err;
58
Eric Sandeene2b46572008-01-28 23:58:27 -050059 /*
60 * If we have encountered a bitmap-format file, the size limit
61 * is smaller than s_maxbytes, which is for extent-mapped files.
62 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070063
Eric Sandeene2b46572008-01-28 23:58:27 -050064 if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
65 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
66 size_t length = iov_length(iov, nr_segs);
67
68 if (pos > sbi->s_bitmap_maxbytes)
69 return -EFBIG;
70
71 if (pos + length > sbi->s_bitmap_maxbytes) {
72 nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
73 sbi->s_bitmap_maxbytes - pos);
74 }
75 }
76
77 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070078 /*
79 * Skip flushing if there was an error, or if nothing was written.
80 */
81 if (ret <= 0)
82 return ret;
83
84 /*
85 * If the inode is IS_SYNC, or is O_SYNC and we are doing data
86 * journalling then we need to make sure that we force the transaction
87 * to disk to keep all metadata uptodate synchronously.
88 */
89 if (file->f_flags & O_SYNC) {
90 /*
91 * If we are non-data-journaled, then the dirty data has
92 * already been flushed to backing store by generic_osync_inode,
93 * and the inode has been flushed too if there have been any
94 * modifications other than mere timestamp updates.
95 *
96 * Open question --- do we care about flushing timestamps too
97 * if the inode is IS_SYNC?
98 */
Mingming Cao617ba132006-10-11 01:20:53 -070099 if (!ext4_should_journal_data(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700100 return ret;
101
102 goto force_commit;
103 }
104
105 /*
106 * So we know that there has been no forced data flush. If the inode
107 * is marked IS_SYNC, we need to force one ourselves.
108 */
109 if (!IS_SYNC(inode))
110 return ret;
111
112 /*
113 * Open question #2 --- should we force data to disk here too? If we
114 * don't, the only impact is that data=writeback filesystems won't
115 * flush data to disk automatically on IS_SYNC, only metadata (but
116 * historically, that is what ext2 has done.)
117 */
118
119force_commit:
Mingming Cao617ba132006-10-11 01:20:53 -0700120 err = ext4_force_commit(inode->i_sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700121 if (err)
122 return err;
123 return ret;
124}
125
Aneesh Kumar K.V2e9ee852008-07-11 19:27:31 -0400126static struct vm_operations_struct ext4_file_vm_ops = {
127 .fault = filemap_fault,
128 .page_mkwrite = ext4_page_mkwrite,
129};
130
131static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
132{
133 struct address_space *mapping = file->f_mapping;
134
135 if (!mapping->a_ops->readpage)
136 return -ENOEXEC;
137 file_accessed(file);
138 vma->vm_ops = &ext4_file_vm_ops;
139 vma->vm_flags |= VM_CAN_NONLINEAR;
140 return 0;
141}
142
Mingming Cao617ba132006-10-11 01:20:53 -0700143const struct file_operations ext4_file_operations = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700144 .llseek = generic_file_llseek,
145 .read = do_sync_read,
146 .write = do_sync_write,
147 .aio_read = generic_file_aio_read,
Mingming Cao617ba132006-10-11 01:20:53 -0700148 .aio_write = ext4_file_write,
Andi Kleen5cdd7b22008-04-29 22:03:54 -0400149 .unlocked_ioctl = ext4_ioctl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700150#ifdef CONFIG_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -0700151 .compat_ioctl = ext4_compat_ioctl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700152#endif
Aneesh Kumar K.V2e9ee852008-07-11 19:27:31 -0400153 .mmap = ext4_file_mmap,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700154 .open = generic_file_open,
Mingming Cao617ba132006-10-11 01:20:53 -0700155 .release = ext4_release_file,
156 .fsync = ext4_sync_file,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700157 .splice_read = generic_file_splice_read,
158 .splice_write = generic_file_splice_write,
159};
160
Arjan van de Ven754661f2007-02-12 00:55:38 -0800161const struct inode_operations ext4_file_inode_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -0700162 .truncate = ext4_truncate,
163 .setattr = ext4_setattr,
Mingming Cao3e3398a2008-07-11 19:27:31 -0400164 .getattr = ext4_getattr,
Mingming Cao617ba132006-10-11 01:20:53 -0700165#ifdef CONFIG_EXT4DEV_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700166 .setxattr = generic_setxattr,
167 .getxattr = generic_getxattr,
Mingming Cao617ba132006-10-11 01:20:53 -0700168 .listxattr = ext4_listxattr,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700169 .removexattr = generic_removexattr,
170#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700171 .permission = ext4_permission,
Amit Aroraa2df2a62007-07-17 21:42:41 -0400172 .fallocate = ext4_fallocate,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700173};
174