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21#include <linux/time.h>
22#include <linux/fs.h>
23#include <linux/jbd2.h>
24#include <linux/mount.h>
25#include <linux/path.h>
26#include "ext4.h"
27#include "ext4_jbd2.h"
28#include "xattr.h"
29#include "acl.h"
30
31
32
33
34
35
36static int ext4_release_file(struct inode *inode, struct file *filp)
37{
38 if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) {
39 ext4_alloc_da_blocks(inode);
40 EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE;
41 }
42
43 if ((filp->f_mode & FMODE_WRITE) &&
44 (atomic_read(&inode->i_writecount) == 1) &&
45 !EXT4_I(inode)->i_reserved_data_blocks)
46 {
47 down_write(&EXT4_I(inode)->i_data_sem);
48 ext4_discard_preallocations(inode);
49 up_write(&EXT4_I(inode)->i_data_sem);
50 }
51 if (is_dx(inode) && filp->private_data)
52 ext4_htree_free_dir_info(filp->private_data);
53
54 return 0;
55}
56
57static ssize_t
58ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
59 unsigned long nr_segs, loff_t pos)
60{
61 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
62
63
64
65
66
67
68 if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
69 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
70 size_t length = iov_length(iov, nr_segs);
71
72 if (pos > sbi->s_bitmap_maxbytes)
73 return -EFBIG;
74
75 if (pos + length > sbi->s_bitmap_maxbytes) {
76 nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
77 sbi->s_bitmap_maxbytes - pos);
78 }
79 }
80
81 return generic_file_aio_write(iocb, iov, nr_segs, pos);
82}
83
84static const struct vm_operations_struct ext4_file_vm_ops = {
85 .fault = filemap_fault,
86 .page_mkwrite = ext4_page_mkwrite,
87};
88
89static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
90{
91 struct address_space *mapping = file->f_mapping;
92
93 if (!mapping->a_ops->readpage)
94 return -ENOEXEC;
95 file_accessed(file);
96 vma->vm_ops = &ext4_file_vm_ops;
97 vma->vm_flags |= VM_CAN_NONLINEAR;
98 return 0;
99}
100
101static int ext4_file_open(struct inode * inode, struct file * filp)
102{
103 struct super_block *sb = inode->i_sb;
104 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
105 struct vfsmount *mnt = filp->f_path.mnt;
106 struct path path;
107 char buf[64], *cp;
108
109 if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
110 !(sb->s_flags & MS_RDONLY))) {
111 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
112
113
114
115
116
117
118 memset(buf, 0, sizeof(buf));
119 path.mnt = mnt->mnt_parent;
120 path.dentry = mnt->mnt_mountpoint;
121 path_get(&path);
122 cp = d_path(&path, buf, sizeof(buf));
123 path_put(&path);
124 if (!IS_ERR(cp)) {
125 memcpy(sbi->s_es->s_last_mounted, cp,
126 sizeof(sbi->s_es->s_last_mounted));
127 sb->s_dirt = 1;
128 }
129 }
130 return generic_file_open(inode, filp);
131}
132
133const struct file_operations ext4_file_operations = {
134 .llseek = generic_file_llseek,
135 .read = do_sync_read,
136 .write = do_sync_write,
137 .aio_read = generic_file_aio_read,
138 .aio_write = ext4_file_write,
139 .unlocked_ioctl = ext4_ioctl,
140#ifdef CONFIG_COMPAT
141 .compat_ioctl = ext4_compat_ioctl,
142#endif
143 .mmap = ext4_file_mmap,
144 .open = ext4_file_open,
145 .release = ext4_release_file,
146 .fsync = ext4_sync_file,
147 .splice_read = generic_file_splice_read,
148 .splice_write = generic_file_splice_write,
149};
150
151const struct inode_operations ext4_file_inode_operations = {
152 .truncate = ext4_truncate,
153 .setattr = ext4_setattr,
154 .getattr = ext4_getattr,
155#ifdef CONFIG_EXT4_FS_XATTR
156 .setxattr = generic_setxattr,
157 .getxattr = generic_getxattr,
158 .listxattr = ext4_listxattr,
159 .removexattr = generic_removexattr,
160#endif
161 .check_acl = ext4_check_acl,
162 .fallocate = ext4_fallocate,
163 .fiemap = ext4_fiemap,
164};
165
166
