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1 | /* |
2 | * file.c |
3 | * |
4 | * PURPOSE |
5 | * File handling routines for the OSTA-UDF(tm) filesystem. |
6 | * |
7 | * COPYRIGHT |
8 | * This file is distributed under the terms of the GNU General Public |
9 | * License (GPL). Copies of the GPL can be obtained from: |
10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
11 | * Each contributing author retains all rights to their own work. |
12 | * |
13 | * (C) 1998-1999 Dave Boynton |
14 | * (C) 1998-2004 Ben Fennema |
15 | * (C) 1999-2000 Stelias Computing Inc |
16 | * |
17 | * HISTORY |
18 | * |
19 | * 10/02/98 dgb Attempt to integrate into udf.o |
20 | * 10/07/98 Switched to using generic_readpage, etc., like isofs |
21 | * And it works! |
22 | * 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but |
23 | * ICBTAG_FLAG_AD_IN_ICB. |
24 | * 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c |
25 | * 05/12/99 Preliminary file write support |
26 | */ |
27 | |
28 | #include "udfdecl.h" |
29 | #include <linux/fs.h> |
30 | #include <asm/uaccess.h> |
31 | #include <linux/kernel.h> |
32 | #include <linux/string.h> /* memset */ |
33 | #include <linux/capability.h> |
34 | #include <linux/errno.h> |
35 | #include <linux/smp_lock.h> |
36 | #include <linux/pagemap.h> |
37 | #include <linux/buffer_head.h> |
38 | #include <linux/aio.h> |
39 | |
40 | #include "udf_i.h" |
41 | #include "udf_sb.h" |
42 | |
43 | static int udf_adinicb_readpage(struct file *file, struct page *page) |
44 | { |
45 | struct inode *inode = page->mapping->host; |
46 | char *kaddr; |
47 | struct udf_inode_info *iinfo = UDF_I(inode); |
48 | |
49 | BUG_ON(!PageLocked(page)); |
50 | |
51 | kaddr = kmap(page); |
52 | memset(kaddr, 0, PAGE_CACHE_SIZE); |
53 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); |
54 | flush_dcache_page(page); |
55 | SetPageUptodate(page); |
56 | kunmap(page); |
57 | unlock_page(page); |
58 | |
59 | return 0; |
60 | } |
61 | |
62 | static int udf_adinicb_writepage(struct page *page, |
63 | struct writeback_control *wbc) |
64 | { |
65 | struct inode *inode = page->mapping->host; |
66 | char *kaddr; |
67 | struct udf_inode_info *iinfo = UDF_I(inode); |
68 | |
69 | BUG_ON(!PageLocked(page)); |
70 | |
71 | kaddr = kmap(page); |
72 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); |
73 | mark_inode_dirty(inode); |
74 | SetPageUptodate(page); |
75 | kunmap(page); |
76 | unlock_page(page); |
77 | |
78 | return 0; |
79 | } |
80 | |
81 | static int udf_adinicb_write_end(struct file *file, |
82 | struct address_space *mapping, |
83 | loff_t pos, unsigned len, unsigned copied, |
84 | struct page *page, void *fsdata) |
85 | { |
86 | struct inode *inode = mapping->host; |
87 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
88 | char *kaddr; |
89 | struct udf_inode_info *iinfo = UDF_I(inode); |
90 | |
91 | kaddr = kmap_atomic(page, KM_USER0); |
92 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset, |
93 | kaddr + offset, copied); |
94 | kunmap_atomic(kaddr, KM_USER0); |
95 | |
96 | return simple_write_end(file, mapping, pos, len, copied, page, fsdata); |
97 | } |
98 | |
99 | const struct address_space_operations udf_adinicb_aops = { |
100 | .readpage = udf_adinicb_readpage, |
101 | .writepage = udf_adinicb_writepage, |
102 | .sync_page = block_sync_page, |
103 | .write_begin = simple_write_begin, |
104 | .write_end = udf_adinicb_write_end, |
105 | }; |
106 | |
107 | static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
108 | unsigned long nr_segs, loff_t ppos) |
109 | { |
110 | ssize_t retval; |
111 | struct file *file = iocb->ki_filp; |
112 | struct inode *inode = file->f_path.dentry->d_inode; |
113 | int err, pos; |
114 | size_t count = iocb->ki_left; |
115 | struct udf_inode_info *iinfo = UDF_I(inode); |
116 | |
117 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
118 | if (file->f_flags & O_APPEND) |
119 | pos = inode->i_size; |
120 | else |
121 | pos = ppos; |
122 | |
123 | if (inode->i_sb->s_blocksize < |
124 | (udf_file_entry_alloc_offset(inode) + |
125 | pos + count)) { |
126 | udf_expand_file_adinicb(inode, pos + count, &err); |
127 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
128 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
129 | return err; |
130 | } |
131 | } else { |
132 | if (pos + count > inode->i_size) |
133 | iinfo->i_lenAlloc = pos + count; |
134 | else |
135 | iinfo->i_lenAlloc = inode->i_size; |
136 | } |
137 | } |
138 | |
139 | retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
140 | if (retval > 0) |
141 | mark_inode_dirty(inode); |
142 | |
143 | return retval; |
144 | } |
145 | |
146 | int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
147 | unsigned long arg) |
148 | { |
149 | long old_block, new_block; |
150 | int result = -EINVAL; |
151 | |
152 | if (file_permission(filp, MAY_READ) != 0) { |
153 | udf_debug("no permission to access inode %lu\n", |
154 | inode->i_ino); |
155 | return -EPERM; |
156 | } |
157 | |
158 | if (!arg) { |
159 | udf_debug("invalid argument to udf_ioctl\n"); |
160 | return -EINVAL; |
161 | } |
162 | |
163 | switch (cmd) { |
164 | case UDF_GETVOLIDENT: |
165 | if (copy_to_user((char __user *)arg, |
166 | UDF_SB(inode->i_sb)->s_volume_ident, 32)) |
167 | return -EFAULT; |
168 | else |
169 | return 0; |
170 | case UDF_RELOCATE_BLOCKS: |
171 | if (!capable(CAP_SYS_ADMIN)) |
172 | return -EACCES; |
173 | if (get_user(old_block, (long __user *)arg)) |
174 | return -EFAULT; |
175 | result = udf_relocate_blocks(inode->i_sb, |
176 | old_block, &new_block); |
177 | if (result == 0) |
178 | result = put_user(new_block, (long __user *)arg); |
179 | return result; |
180 | case UDF_GETEASIZE: |
181 | result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); |
182 | break; |
183 | case UDF_GETEABLOCK: |
184 | result = copy_to_user((char __user *)arg, |
185 | UDF_I(inode)->i_ext.i_data, |
186 | UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; |
187 | break; |
188 | } |
189 | |
190 | return result; |
191 | } |
192 | |
193 | static int udf_release_file(struct inode *inode, struct file *filp) |
194 | { |
195 | if (filp->f_mode & FMODE_WRITE) { |
196 | lock_kernel(); |
197 | udf_discard_prealloc(inode); |
198 | unlock_kernel(); |
199 | } |
200 | return 0; |
201 | } |
202 | |
203 | const struct file_operations udf_file_operations = { |
204 | .read = do_sync_read, |
205 | .aio_read = generic_file_aio_read, |
206 | .ioctl = udf_ioctl, |
207 | .open = generic_file_open, |
208 | .mmap = generic_file_mmap, |
209 | .write = do_sync_write, |
210 | .aio_write = udf_file_aio_write, |
211 | .release = udf_release_file, |
212 | .fsync = simple_fsync, |
213 | .splice_read = generic_file_splice_read, |
214 | .llseek = generic_file_llseek, |
215 | }; |
216 | |
217 | const struct inode_operations udf_file_inode_operations = { |
218 | .truncate = udf_truncate, |
219 | }; |
220 |
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