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1da177e4 LT |
1 | /* |
2 | * file.c | |
3 | * | |
4 | * PURPOSE | |
5 | * File handling routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
7 | * CONTACTS | |
8 | * E-mail regarding any portion of the Linux UDF file system should be | |
9 | * directed to the development team mailing list (run by majordomo): | |
10 | * linux_udf@hpesjro.fc.hp.com | |
11 | * | |
12 | * COPYRIGHT | |
13 | * This file is distributed under the terms of the GNU General Public | |
14 | * License (GPL). Copies of the GPL can be obtained from: | |
15 | * ftp://prep.ai.mit.edu/pub/gnu/GPL | |
16 | * Each contributing author retains all rights to their own work. | |
17 | * | |
18 | * (C) 1998-1999 Dave Boynton | |
19 | * (C) 1998-2004 Ben Fennema | |
20 | * (C) 1999-2000 Stelias Computing Inc | |
21 | * | |
22 | * HISTORY | |
23 | * | |
24 | * 10/02/98 dgb Attempt to integrate into udf.o | |
25 | * 10/07/98 Switched to using generic_readpage, etc., like isofs | |
26 | * And it works! | |
27 | * 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but | |
28 | * ICBTAG_FLAG_AD_IN_ICB. | |
29 | * 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c | |
30 | * 05/12/99 Preliminary file write support | |
31 | */ | |
32 | ||
33 | #include "udfdecl.h" | |
34 | #include <linux/fs.h> | |
35 | #include <linux/udf_fs.h> | |
36 | #include <asm/uaccess.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/string.h> /* memset */ | |
39 | #include <linux/errno.h> | |
40 | #include <linux/smp_lock.h> | |
41 | #include <linux/pagemap.h> | |
42 | #include <linux/buffer_head.h> | |
43 | ||
44 | #include "udf_i.h" | |
45 | #include "udf_sb.h" | |
46 | ||
47 | static int udf_adinicb_readpage(struct file *file, struct page * page) | |
48 | { | |
49 | struct inode *inode = page->mapping->host; | |
50 | char *kaddr; | |
51 | ||
52 | if (!PageLocked(page)) | |
53 | PAGE_BUG(page); | |
54 | ||
55 | kaddr = kmap(page); | |
56 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
57 | memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size); | |
58 | flush_dcache_page(page); | |
59 | SetPageUptodate(page); | |
60 | kunmap(page); | |
61 | unlock_page(page); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc) | |
66 | { | |
67 | struct inode *inode = page->mapping->host; | |
68 | char *kaddr; | |
69 | ||
70 | if (!PageLocked(page)) | |
71 | PAGE_BUG(page); | |
72 | ||
73 | kaddr = kmap(page); | |
74 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size); | |
75 | mark_inode_dirty(inode); | |
76 | SetPageUptodate(page); | |
77 | kunmap(page); | |
78 | unlock_page(page); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
83 | { | |
84 | kmap(page); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
89 | { | |
90 | struct inode *inode = page->mapping->host; | |
91 | char *kaddr = page_address(page); | |
92 | ||
93 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, | |
94 | kaddr + offset, to - offset); | |
95 | mark_inode_dirty(inode); | |
96 | SetPageUptodate(page); | |
97 | kunmap(page); | |
98 | /* only one page here */ | |
99 | if (to > inode->i_size) | |
100 | inode->i_size = to; | |
101 | return 0; | |
102 | } | |
103 | ||
104 | struct address_space_operations udf_adinicb_aops = { | |
105 | .readpage = udf_adinicb_readpage, | |
106 | .writepage = udf_adinicb_writepage, | |
107 | .sync_page = block_sync_page, | |
108 | .prepare_write = udf_adinicb_prepare_write, | |
109 | .commit_write = udf_adinicb_commit_write, | |
110 | }; | |
111 | ||
112 | static ssize_t udf_file_write(struct file * file, const char __user * buf, | |
113 | size_t count, loff_t *ppos) | |
114 | { | |
115 | ssize_t retval; | |
116 | struct inode *inode = file->f_dentry->d_inode; | |
117 | int err, pos; | |
118 | ||
119 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) | |
120 | { | |
121 | if (file->f_flags & O_APPEND) | |
122 | pos = inode->i_size; | |
123 | else | |
124 | pos = *ppos; | |
125 | ||
126 | if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) + | |
127 | pos + count)) | |
128 | { | |
129 | udf_expand_file_adinicb(inode, pos + count, &err); | |
130 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) | |
131 | { | |
132 | udf_debug("udf_expand_adinicb: err=%d\n", err); | |
133 | return err; | |
134 | } | |
135 | } | |
136 | else | |
137 | { | |
138 | if (pos + count > inode->i_size) | |
139 | UDF_I_LENALLOC(inode) = pos + count; | |
140 | else | |
141 | UDF_I_LENALLOC(inode) = inode->i_size; | |
142 | } | |
143 | } | |
144 | ||
145 | retval = generic_file_write(file, buf, count, ppos); | |
146 | ||
147 | if (retval > 0) | |
148 | mark_inode_dirty(inode); | |
149 | return retval; | |
150 | } | |
151 | ||
152 | /* | |
153 | * udf_ioctl | |
154 | * | |
155 | * PURPOSE | |
156 | * Issue an ioctl. | |
157 | * | |
158 | * DESCRIPTION | |
159 | * Optional - sys_ioctl() will return -ENOTTY if this routine is not | |
160 | * available, and the ioctl cannot be handled without filesystem help. | |
161 | * | |
162 | * sys_ioctl() handles these ioctls that apply only to regular files: | |
163 | * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD | |
164 | * These ioctls are also handled by sys_ioctl(): | |
165 | * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC | |
166 | * All other ioctls are passed to the filesystem. | |
167 | * | |
168 | * Refer to sys_ioctl() in fs/ioctl.c | |
169 | * sys_ioctl() -> . | |
170 | * | |
171 | * PRE-CONDITIONS | |
172 | * inode Pointer to inode that ioctl was issued on. | |
173 | * filp Pointer to file that ioctl was issued on. | |
174 | * cmd The ioctl command. | |
175 | * arg The ioctl argument [can be interpreted as a | |
176 | * user-space pointer if desired]. | |
177 | * | |
178 | * POST-CONDITIONS | |
179 | * <return> Success (>=0) or an error code (<=0) that | |
180 | * sys_ioctl() will return. | |
181 | * | |
182 | * HISTORY | |
183 | * July 1, 1997 - Andrew E. Mileski | |
184 | * Written, tested, and released. | |
185 | */ | |
186 | int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, | |
187 | unsigned long arg) | |
188 | { | |
189 | int result = -EINVAL; | |
190 | ||
191 | if ( permission(inode, MAY_READ, NULL) != 0 ) | |
192 | { | |
193 | udf_debug("no permission to access inode %lu\n", | |
194 | inode->i_ino); | |
195 | return -EPERM; | |
196 | } | |
197 | ||
198 | if ( !arg ) | |
199 | { | |
200 | udf_debug("invalid argument to udf_ioctl\n"); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | switch (cmd) | |
205 | { | |
206 | case UDF_GETVOLIDENT: | |
207 | return copy_to_user((char __user *)arg, | |
208 | UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0; | |
209 | case UDF_RELOCATE_BLOCKS: | |
210 | { | |
211 | long old, new; | |
212 | ||
213 | if (!capable(CAP_SYS_ADMIN)) return -EACCES; | |
214 | if (get_user(old, (long __user *)arg)) return -EFAULT; | |
215 | if ((result = udf_relocate_blocks(inode->i_sb, | |
216 | old, &new)) == 0) | |
217 | result = put_user(new, (long __user *)arg); | |
218 | ||
219 | return result; | |
220 | } | |
221 | case UDF_GETEASIZE: | |
222 | result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg); | |
223 | break; | |
224 | ||
225 | case UDF_GETEABLOCK: | |
226 | result = copy_to_user((char __user *)arg, UDF_I_DATA(inode), | |
227 | UDF_I_LENEATTR(inode)) ? -EFAULT : 0; | |
228 | break; | |
229 | } | |
230 | ||
231 | return result; | |
232 | } | |
233 | ||
234 | /* | |
235 | * udf_release_file | |
236 | * | |
237 | * PURPOSE | |
238 | * Called when all references to the file are closed | |
239 | * | |
240 | * DESCRIPTION | |
241 | * Discard prealloced blocks | |
242 | * | |
243 | * HISTORY | |
244 | * | |
245 | */ | |
246 | static int udf_release_file(struct inode * inode, struct file * filp) | |
247 | { | |
248 | if (filp->f_mode & FMODE_WRITE) | |
249 | { | |
250 | lock_kernel(); | |
251 | udf_discard_prealloc(inode); | |
252 | unlock_kernel(); | |
253 | } | |
254 | return 0; | |
255 | } | |
256 | ||
257 | struct file_operations udf_file_operations = { | |
258 | .read = generic_file_read, | |
259 | .ioctl = udf_ioctl, | |
260 | .open = generic_file_open, | |
261 | .mmap = generic_file_mmap, | |
262 | .write = udf_file_write, | |
263 | .release = udf_release_file, | |
264 | .fsync = udf_fsync_file, | |
265 | .sendfile = generic_file_sendfile, | |
266 | }; | |
267 | ||
268 | struct inode_operations udf_file_inode_operations = { | |
269 | .truncate = udf_truncate, | |
270 | }; |