Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * file.c | |
3 | * | |
4 | * PURPOSE | |
5 | * File handling routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
1da177e4 LT |
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 <linux/udf_fs.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <linux/kernel.h> | |
cb00ea35 | 33 | #include <linux/string.h> /* memset */ |
16f7e0fe | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/errno.h> |
36 | #include <linux/smp_lock.h> | |
37 | #include <linux/pagemap.h> | |
38 | #include <linux/buffer_head.h> | |
e8edc6e0 | 39 | #include <linux/aio.h> |
1da177e4 LT |
40 | |
41 | #include "udf_i.h" | |
42 | #include "udf_sb.h" | |
43 | ||
cb00ea35 | 44 | static int udf_adinicb_readpage(struct file *file, struct page *page) |
1da177e4 LT |
45 | { |
46 | struct inode *inode = page->mapping->host; | |
47 | char *kaddr; | |
48 | ||
cd7619d6 | 49 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
50 | |
51 | kaddr = kmap(page); | |
52 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
53 | memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size); | |
54 | flush_dcache_page(page); | |
55 | SetPageUptodate(page); | |
56 | kunmap(page); | |
57 | unlock_page(page); | |
58 | return 0; | |
59 | } | |
60 | ||
cb00ea35 CG |
61 | static int udf_adinicb_writepage(struct page *page, |
62 | struct writeback_control *wbc) | |
1da177e4 LT |
63 | { |
64 | struct inode *inode = page->mapping->host; | |
65 | char *kaddr; | |
66 | ||
cd7619d6 | 67 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
68 | |
69 | kaddr = kmap(page); | |
70 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size); | |
71 | mark_inode_dirty(inode); | |
72 | SetPageUptodate(page); | |
73 | kunmap(page); | |
74 | unlock_page(page); | |
75 | return 0; | |
76 | } | |
77 | ||
cb00ea35 CG |
78 | static int udf_adinicb_prepare_write(struct file *file, struct page *page, |
79 | unsigned offset, unsigned to) | |
1da177e4 LT |
80 | { |
81 | kmap(page); | |
82 | return 0; | |
83 | } | |
84 | ||
cb00ea35 CG |
85 | static int udf_adinicb_commit_write(struct file *file, struct page *page, |
86 | unsigned offset, unsigned to) | |
1da177e4 LT |
87 | { |
88 | struct inode *inode = page->mapping->host; | |
89 | char *kaddr = page_address(page); | |
90 | ||
91 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, | |
cb00ea35 | 92 | kaddr + offset, to - offset); |
1da177e4 LT |
93 | mark_inode_dirty(inode); |
94 | SetPageUptodate(page); | |
95 | kunmap(page); | |
96 | /* only one page here */ | |
97 | if (to > inode->i_size) | |
98 | inode->i_size = to; | |
99 | return 0; | |
100 | } | |
101 | ||
f5e54d6e | 102 | const struct address_space_operations udf_adinicb_aops = { |
cb00ea35 CG |
103 | .readpage = udf_adinicb_readpage, |
104 | .writepage = udf_adinicb_writepage, | |
105 | .sync_page = block_sync_page, | |
106 | .prepare_write = udf_adinicb_prepare_write, | |
107 | .commit_write = udf_adinicb_commit_write, | |
1da177e4 LT |
108 | }; |
109 | ||
543ade1f | 110 | static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
cb00ea35 | 111 | unsigned long nr_segs, loff_t ppos) |
1da177e4 LT |
112 | { |
113 | ssize_t retval; | |
543ade1f | 114 | struct file *file = iocb->ki_filp; |
5096e933 | 115 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 | 116 | int err, pos; |
543ade1f | 117 | size_t count = iocb->ki_left; |
1da177e4 | 118 | |
cb00ea35 | 119 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 LT |
120 | if (file->f_flags & O_APPEND) |
121 | pos = inode->i_size; | |
122 | else | |
543ade1f | 123 | pos = ppos; |
1da177e4 | 124 | |
cb00ea35 CG |
125 | if (inode->i_sb->s_blocksize < |
126 | (udf_file_entry_alloc_offset(inode) + pos + count)) { | |
1da177e4 | 127 | udf_expand_file_adinicb(inode, pos + count, &err); |
cb00ea35 | 128 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 LT |
129 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
130 | return err; | |
131 | } | |
cb00ea35 | 132 | } else { |
1da177e4 LT |
133 | if (pos + count > inode->i_size) |
134 | UDF_I_LENALLOC(inode) = pos + count; | |
135 | else | |
136 | UDF_I_LENALLOC(inode) = inode->i_size; | |
137 | } | |
138 | } | |
139 | ||
543ade1f | 140 | retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
1da177e4 LT |
141 | |
142 | if (retval > 0) | |
143 | mark_inode_dirty(inode); | |
144 | return retval; | |
145 | } | |
146 | ||
147 | /* | |
148 | * udf_ioctl | |
149 | * | |
150 | * PURPOSE | |
151 | * Issue an ioctl. | |
152 | * | |
153 | * DESCRIPTION | |
154 | * Optional - sys_ioctl() will return -ENOTTY if this routine is not | |
155 | * available, and the ioctl cannot be handled without filesystem help. | |
156 | * | |
157 | * sys_ioctl() handles these ioctls that apply only to regular files: | |
158 | * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD | |
159 | * These ioctls are also handled by sys_ioctl(): | |
160 | * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC | |
161 | * All other ioctls are passed to the filesystem. | |
162 | * | |
163 | * Refer to sys_ioctl() in fs/ioctl.c | |
164 | * sys_ioctl() -> . | |
165 | * | |
166 | * PRE-CONDITIONS | |
167 | * inode Pointer to inode that ioctl was issued on. | |
168 | * filp Pointer to file that ioctl was issued on. | |
169 | * cmd The ioctl command. | |
170 | * arg The ioctl argument [can be interpreted as a | |
171 | * user-space pointer if desired]. | |
172 | * | |
173 | * POST-CONDITIONS | |
174 | * <return> Success (>=0) or an error code (<=0) that | |
175 | * sys_ioctl() will return. | |
176 | * | |
177 | * HISTORY | |
178 | * July 1, 1997 - Andrew E. Mileski | |
179 | * Written, tested, and released. | |
180 | */ | |
181 | int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, | |
cb00ea35 | 182 | unsigned long arg) |
1da177e4 LT |
183 | { |
184 | int result = -EINVAL; | |
185 | ||
cb00ea35 CG |
186 | if (file_permission(filp, MAY_READ) != 0) { |
187 | udf_debug("no permission to access inode %lu\n", inode->i_ino); | |
1da177e4 LT |
188 | return -EPERM; |
189 | } | |
190 | ||
cb00ea35 | 191 | if (!arg) { |
1da177e4 LT |
192 | udf_debug("invalid argument to udf_ioctl\n"); |
193 | return -EINVAL; | |
194 | } | |
195 | ||
cb00ea35 CG |
196 | switch (cmd) { |
197 | case UDF_GETVOLIDENT: | |
198 | return copy_to_user((char __user *)arg, | |
199 | UDF_SB_VOLIDENT(inode->i_sb), | |
200 | 32) ? -EFAULT : 0; | |
201 | case UDF_RELOCATE_BLOCKS: | |
1da177e4 LT |
202 | { |
203 | long old, new; | |
204 | ||
cb00ea35 CG |
205 | if (!capable(CAP_SYS_ADMIN)) |
206 | return -EACCES; | |
207 | if (get_user(old, (long __user *)arg)) | |
208 | return -EFAULT; | |
1da177e4 | 209 | if ((result = udf_relocate_blocks(inode->i_sb, |
cb00ea35 | 210 | old, &new)) == 0) |
1da177e4 LT |
211 | result = put_user(new, (long __user *)arg); |
212 | ||
213 | return result; | |
214 | } | |
cb00ea35 CG |
215 | case UDF_GETEASIZE: |
216 | result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg); | |
217 | break; | |
1da177e4 | 218 | |
cb00ea35 CG |
219 | case UDF_GETEABLOCK: |
220 | result = copy_to_user((char __user *)arg, UDF_I_DATA(inode), | |
221 | UDF_I_LENEATTR(inode)) ? -EFAULT : 0; | |
222 | break; | |
1da177e4 LT |
223 | } |
224 | ||
225 | return result; | |
226 | } | |
227 | ||
228 | /* | |
229 | * udf_release_file | |
230 | * | |
231 | * PURPOSE | |
232 | * Called when all references to the file are closed | |
233 | * | |
234 | * DESCRIPTION | |
235 | * Discard prealloced blocks | |
236 | * | |
237 | * HISTORY | |
238 | * | |
239 | */ | |
cb00ea35 | 240 | static int udf_release_file(struct inode *inode, struct file *filp) |
1da177e4 | 241 | { |
cb00ea35 | 242 | if (filp->f_mode & FMODE_WRITE) { |
1da177e4 LT |
243 | lock_kernel(); |
244 | udf_discard_prealloc(inode); | |
245 | unlock_kernel(); | |
246 | } | |
247 | return 0; | |
248 | } | |
249 | ||
4b6f5d20 | 250 | const struct file_operations udf_file_operations = { |
cb00ea35 CG |
251 | .read = do_sync_read, |
252 | .aio_read = generic_file_aio_read, | |
253 | .ioctl = udf_ioctl, | |
254 | .open = generic_file_open, | |
255 | .mmap = generic_file_mmap, | |
256 | .write = do_sync_write, | |
257 | .aio_write = udf_file_aio_write, | |
258 | .release = udf_release_file, | |
259 | .fsync = udf_fsync_file, | |
260 | .splice_read = generic_file_splice_read, | |
1da177e4 LT |
261 | }; |
262 | ||
c5ef1c42 | 263 | const struct inode_operations udf_file_inode_operations = { |
cb00ea35 | 264 | .truncate = udf_truncate, |
1da177e4 | 265 | }; |