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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/file.c |
ac27a0ec DK |
3 | * |
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 | * | |
617ba13b | 15 | * ext4 fs regular file handling primitives |
ac27a0ec DK |
16 | * |
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> | |
dab291af | 23 | #include <linux/jbd2.h> |
bc0b0d6d TT |
24 | #include <linux/mount.h> |
25 | #include <linux/path.h> | |
3dcf5451 CH |
26 | #include "ext4.h" |
27 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
28 | #include "xattr.h" |
29 | #include "acl.h" | |
30 | ||
31 | /* | |
32 | * Called when an inode is released. Note that this is different | |
617ba13b | 33 | * from ext4_file_open: open gets called at every open, but release |
ac27a0ec DK |
34 | * gets called only when /all/ the files are closed. |
35 | */ | |
af5bc92d | 36 | static int ext4_release_file(struct inode *inode, struct file *filp) |
ac27a0ec | 37 | { |
7d8f9f7d TT |
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 | } | |
ac27a0ec DK |
42 | /* if we are the last writer on the inode, drop the block reservation */ |
43 | if ((filp->f_mode & FMODE_WRITE) && | |
d6014301 AK |
44 | (atomic_read(&inode->i_writecount) == 1) && |
45 | !EXT4_I(inode)->i_reserved_data_blocks) | |
ac27a0ec | 46 | { |
0e855ac8 | 47 | down_write(&EXT4_I(inode)->i_data_sem); |
c2ea3fde | 48 | ext4_discard_preallocations(inode); |
0e855ac8 | 49 | up_write(&EXT4_I(inode)->i_data_sem); |
ac27a0ec DK |
50 | } |
51 | if (is_dx(inode) && filp->private_data) | |
617ba13b | 52 | ext4_htree_free_dir_info(filp->private_data); |
ac27a0ec DK |
53 | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static ssize_t | |
617ba13b | 58 | ext4_file_write(struct kiocb *iocb, const struct iovec *iov, |
ac27a0ec DK |
59 | unsigned long nr_segs, loff_t pos) |
60 | { | |
0d34ec62 | 61 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
ac27a0ec | 62 | |
e2b46574 ES |
63 | /* |
64 | * If we have encountered a bitmap-format file, the size limit | |
65 | * is smaller than s_maxbytes, which is for extent-mapped files. | |
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); | |
ac27a0ec | 71 | |
e2b46574 ES |
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 | ||
0d34ec62 | 81 | return generic_file_aio_write(iocb, iov, nr_segs, pos); |
ac27a0ec DK |
82 | } |
83 | ||
f0f37e2f | 84 | static const struct vm_operations_struct ext4_file_vm_ops = { |
2e9ee850 AK |
85 | .fault = filemap_fault, |
86 | .page_mkwrite = ext4_page_mkwrite, | |
87 | }; | |
88 | ||
89 | static 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 | ||
bc0b0d6d TT |
101 | static 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 | * Sample where the filesystem has been mounted and | |
114 | * store it in the superblock for sysadmin convenience | |
115 | * when trying to sort through large numbers of block | |
116 | * devices or filesystem images. | |
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 | ||
617ba13b | 133 | const struct file_operations ext4_file_operations = { |
ac27a0ec DK |
134 | .llseek = generic_file_llseek, |
135 | .read = do_sync_read, | |
136 | .write = do_sync_write, | |
137 | .aio_read = generic_file_aio_read, | |
617ba13b | 138 | .aio_write = ext4_file_write, |
5cdd7b2d | 139 | .unlocked_ioctl = ext4_ioctl, |
ac27a0ec | 140 | #ifdef CONFIG_COMPAT |
617ba13b | 141 | .compat_ioctl = ext4_compat_ioctl, |
ac27a0ec | 142 | #endif |
2e9ee850 | 143 | .mmap = ext4_file_mmap, |
bc0b0d6d | 144 | .open = ext4_file_open, |
617ba13b MC |
145 | .release = ext4_release_file, |
146 | .fsync = ext4_sync_file, | |
ac27a0ec DK |
147 | .splice_read = generic_file_splice_read, |
148 | .splice_write = generic_file_splice_write, | |
149 | }; | |
150 | ||
754661f1 | 151 | const struct inode_operations ext4_file_inode_operations = { |
617ba13b MC |
152 | .truncate = ext4_truncate, |
153 | .setattr = ext4_setattr, | |
3e3398a0 | 154 | .getattr = ext4_getattr, |
03010a33 | 155 | #ifdef CONFIG_EXT4_FS_XATTR |
ac27a0ec DK |
156 | .setxattr = generic_setxattr, |
157 | .getxattr = generic_getxattr, | |
617ba13b | 158 | .listxattr = ext4_listxattr, |
ac27a0ec DK |
159 | .removexattr = generic_removexattr, |
160 | #endif | |
1d5ccd1c | 161 | .check_acl = ext4_check_acl, |
a2df2a63 | 162 | .fallocate = ext4_fallocate, |
6873fa0d | 163 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
164 | }; |
165 |