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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>
Theodore Ts'obc0b0d62009-06-13 10:09:48 -040024#include <linux/mount.h>
25#include <linux/path.h>
Christoph Hellwig871a2932010-03-03 09:05:07 -050026#include <linux/quotaops.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040027#include "ext4.h"
28#include "ext4_jbd2.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029#include "xattr.h"
30#include "acl.h"
31
32/*
33 * Called when an inode is released. Note that this is different
Mingming Cao617ba132006-10-11 01:20:53 -070034 * from ext4_file_open: open gets called at every open, but release
Dave Kleikampac27a0e2006-10-11 01:20:50 -070035 * gets called only when /all/ the files are closed.
36 */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040037static int ext4_release_file(struct inode *inode, struct file *filp)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038{
Theodore Ts'o19f5fb72010-01-24 14:34:07 -050039 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
Theodore Ts'o7d8f9f72009-02-24 08:21:14 -050040 ext4_alloc_da_blocks(inode);
Theodore Ts'o19f5fb72010-01-24 14:34:07 -050041 ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
Theodore Ts'o7d8f9f72009-02-24 08:21:14 -050042 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043 /* if we are the last writer on the inode, drop the block reservation */
44 if ((filp->f_mode & FMODE_WRITE) &&
Aneesh Kumar K.Vd6014302009-03-27 22:36:43 -040045 (atomic_read(&inode->i_writecount) == 1) &&
46 !EXT4_I(inode)->i_reserved_data_blocks)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 {
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -050048 down_write(&EXT4_I(inode)->i_data_sem);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -040049 ext4_discard_preallocations(inode);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -050050 up_write(&EXT4_I(inode)->i_data_sem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 }
52 if (is_dx(inode) && filp->private_data)
Mingming Cao617ba132006-10-11 01:20:53 -070053 ext4_htree_free_dir_info(filp->private_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070054
55 return 0;
56}
57
58static ssize_t
Mingming Cao617ba132006-10-11 01:20:53 -070059ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070060 unsigned long nr_segs, loff_t pos)
61{
Jan Kara0d34ec62009-08-18 17:48:27 +020062 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070063
Eric Sandeene2b46572008-01-28 23:58:27 -050064 /*
65 * If we have encountered a bitmap-format file, the size limit
66 * is smaller than s_maxbytes, which is for extent-mapped files.
67 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070068
Dmitry Monakhov12e9b892010-05-16 22:00:00 -040069 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
Eric Sandeene2b46572008-01-28 23:58:27 -050070 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
71 size_t length = iov_length(iov, nr_segs);
72
Toshiyuki Okajimad889dc82010-07-27 11:56:07 -040073 if ((pos > sbi->s_bitmap_maxbytes ||
74 (pos == sbi->s_bitmap_maxbytes && length > 0)))
Eric Sandeene2b46572008-01-28 23:58:27 -050075 return -EFBIG;
76
77 if (pos + length > sbi->s_bitmap_maxbytes) {
78 nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
79 sbi->s_bitmap_maxbytes - pos);
80 }
81 }
82
Jan Kara0d34ec62009-08-18 17:48:27 +020083 return generic_file_aio_write(iocb, iov, nr_segs, pos);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070084}
85
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +040086static const struct vm_operations_struct ext4_file_vm_ops = {
Aneesh Kumar K.V2e9ee852008-07-11 19:27:31 -040087 .fault = filemap_fault,
88 .page_mkwrite = ext4_page_mkwrite,
89};
90
91static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
92{
93 struct address_space *mapping = file->f_mapping;
94
95 if (!mapping->a_ops->readpage)
96 return -ENOEXEC;
97 file_accessed(file);
98 vma->vm_ops = &ext4_file_vm_ops;
99 vma->vm_flags |= VM_CAN_NONLINEAR;
100 return 0;
101}
102
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400103static int ext4_file_open(struct inode * inode, struct file * filp)
104{
105 struct super_block *sb = inode->i_sb;
106 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
107 struct vfsmount *mnt = filp->f_path.mnt;
108 struct path path;
109 char buf[64], *cp;
110
111 if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
112 !(sb->s_flags & MS_RDONLY))) {
113 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
114 /*
115 * Sample where the filesystem has been mounted and
116 * store it in the superblock for sysadmin convenience
117 * when trying to sort through large numbers of block
118 * devices or filesystem images.
119 */
120 memset(buf, 0, sizeof(buf));
Al Viro38991672010-01-23 20:10:29 -0500121 path.mnt = mnt;
122 path.dentry = mnt->mnt_root;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400123 cp = d_path(&path, buf, sizeof(buf));
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400124 if (!IS_ERR(cp)) {
125 memcpy(sbi->s_es->s_last_mounted, cp,
126 sizeof(sbi->s_es->s_last_mounted));
Theodore Ts'oa0375152010-06-11 23:14:04 -0400127 ext4_mark_super_dirty(sb);
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400128 }
129 }
Christoph Hellwig907f4552010-03-03 09:05:06 -0500130 return dquot_file_open(inode, filp);
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400131}
132
Mingming Cao617ba132006-10-11 01:20:53 -0700133const struct file_operations ext4_file_operations = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700134 .llseek = generic_file_llseek,
135 .read = do_sync_read,
136 .write = do_sync_write,
137 .aio_read = generic_file_aio_read,
Mingming Cao617ba132006-10-11 01:20:53 -0700138 .aio_write = ext4_file_write,
Andi Kleen5cdd7b22008-04-29 22:03:54 -0400139 .unlocked_ioctl = ext4_ioctl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700140#ifdef CONFIG_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -0700141 .compat_ioctl = ext4_compat_ioctl,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700142#endif
Aneesh Kumar K.V2e9ee852008-07-11 19:27:31 -0400143 .mmap = ext4_file_mmap,
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400144 .open = ext4_file_open,
Mingming Cao617ba132006-10-11 01:20:53 -0700145 .release = ext4_release_file,
146 .fsync = ext4_sync_file,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700147 .splice_read = generic_file_splice_read,
148 .splice_write = generic_file_splice_write,
149};
150
Arjan van de Ven754661f2007-02-12 00:55:38 -0800151const struct inode_operations ext4_file_inode_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -0700152 .truncate = ext4_truncate,
153 .setattr = ext4_setattr,
Mingming Cao3e3398a2008-07-11 19:27:31 -0400154 .getattr = ext4_getattr,
Theodore Ts'o03010a32008-10-10 20:02:48 -0400155#ifdef CONFIG_EXT4_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700156 .setxattr = generic_setxattr,
157 .getxattr = generic_getxattr,
Mingming Cao617ba132006-10-11 01:20:53 -0700158 .listxattr = ext4_listxattr,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700159 .removexattr = generic_removexattr,
160#endif
Linus Torvalds1d5ccd12009-08-28 12:12:24 -0700161 .check_acl = ext4_check_acl,
Amit Aroraa2df2a62007-07-17 21:42:41 -0400162 .fallocate = ext4_fallocate,
Eric Sandeen6873fa02008-10-07 00:46:36 -0400163 .fiemap = ext4_fiemap,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700164};
165