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> | |
28de7948 | 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; | |
48d6d8ff | 48 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 49 | |
cd7619d6 | 50 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
51 | |
52 | kaddr = kmap(page); | |
53 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
48d6d8ff | 54 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); |
1da177e4 LT |
55 | flush_dcache_page(page); |
56 | SetPageUptodate(page); | |
57 | kunmap(page); | |
58 | unlock_page(page); | |
28de7948 | 59 | |
1da177e4 LT |
60 | return 0; |
61 | } | |
62 | ||
4b11111a MS |
63 | static int udf_adinicb_writepage(struct page *page, |
64 | struct writeback_control *wbc) | |
1da177e4 LT |
65 | { |
66 | struct inode *inode = page->mapping->host; | |
67 | char *kaddr; | |
48d6d8ff | 68 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 69 | |
cd7619d6 | 70 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
71 | |
72 | kaddr = kmap(page); | |
48d6d8ff | 73 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); |
1da177e4 LT |
74 | mark_inode_dirty(inode); |
75 | SetPageUptodate(page); | |
76 | kunmap(page); | |
77 | unlock_page(page); | |
28de7948 | 78 | |
1da177e4 LT |
79 | return 0; |
80 | } | |
81 | ||
be021ee4 NP |
82 | static int udf_adinicb_write_end(struct file *file, |
83 | struct address_space *mapping, | |
84 | loff_t pos, unsigned len, unsigned copied, | |
85 | struct page *page, void *fsdata) | |
1da177e4 | 86 | { |
be021ee4 NP |
87 | struct inode *inode = mapping->host; |
88 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
89 | char *kaddr; | |
48d6d8ff | 90 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 91 | |
be021ee4 | 92 | kaddr = kmap_atomic(page, KM_USER0); |
48d6d8ff | 93 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset, |
be021ee4 NP |
94 | kaddr + offset, copied); |
95 | kunmap_atomic(kaddr, KM_USER0); | |
96 | ||
97 | return simple_write_end(file, mapping, pos, len, copied, page, fsdata); | |
1da177e4 LT |
98 | } |
99 | ||
f5e54d6e | 100 | const struct address_space_operations udf_adinicb_aops = { |
28de7948 CG |
101 | .readpage = udf_adinicb_readpage, |
102 | .writepage = udf_adinicb_writepage, | |
103 | .sync_page = block_sync_page, | |
be021ee4 NP |
104 | .write_begin = simple_write_begin, |
105 | .write_end = udf_adinicb_write_end, | |
1da177e4 LT |
106 | }; |
107 | ||
543ade1f | 108 | static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
cb00ea35 | 109 | unsigned long nr_segs, loff_t ppos) |
1da177e4 LT |
110 | { |
111 | ssize_t retval; | |
543ade1f | 112 | struct file *file = iocb->ki_filp; |
5096e933 | 113 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 | 114 | int err, pos; |
543ade1f | 115 | size_t count = iocb->ki_left; |
48d6d8ff | 116 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 117 | |
48d6d8ff | 118 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 LT |
119 | if (file->f_flags & O_APPEND) |
120 | pos = inode->i_size; | |
121 | else | |
543ade1f | 122 | pos = ppos; |
1da177e4 | 123 | |
4b11111a MS |
124 | if (inode->i_sb->s_blocksize < |
125 | (udf_file_entry_alloc_offset(inode) + | |
28de7948 | 126 | pos + count)) { |
1da177e4 | 127 | udf_expand_file_adinicb(inode, pos + count, &err); |
48d6d8ff | 128 | if (iinfo->i_alloc_type == 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 | 133 | if (pos + count > inode->i_size) |
48d6d8ff | 134 | iinfo->i_lenAlloc = pos + count; |
1da177e4 | 135 | else |
48d6d8ff | 136 | iinfo->i_lenAlloc = inode->i_size; |
1da177e4 LT |
137 | } |
138 | } | |
139 | ||
543ade1f | 140 | retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
1da177e4 LT |
141 | if (retval > 0) |
142 | mark_inode_dirty(inode); | |
28de7948 | 143 | |
1da177e4 LT |
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 | 183 | { |
28de7948 | 184 | long old_block, new_block; |
1da177e4 LT |
185 | int result = -EINVAL; |
186 | ||
cb00ea35 | 187 | if (file_permission(filp, MAY_READ) != 0) { |
28de7948 CG |
188 | udf_debug("no permission to access inode %lu\n", |
189 | inode->i_ino); | |
1da177e4 LT |
190 | return -EPERM; |
191 | } | |
192 | ||
cb00ea35 | 193 | if (!arg) { |
1da177e4 LT |
194 | udf_debug("invalid argument to udf_ioctl\n"); |
195 | return -EINVAL; | |
196 | } | |
197 | ||
cb00ea35 CG |
198 | switch (cmd) { |
199 | case UDF_GETVOLIDENT: | |
4b11111a MS |
200 | if (copy_to_user((char __user *)arg, |
201 | UDF_SB(inode->i_sb)->s_volume_ident, 32)) | |
202 | return -EFAULT; | |
203 | else | |
204 | return 0; | |
cb00ea35 | 205 | case UDF_RELOCATE_BLOCKS: |
28de7948 CG |
206 | if (!capable(CAP_SYS_ADMIN)) |
207 | return -EACCES; | |
208 | if (get_user(old_block, (long __user *)arg)) | |
209 | return -EFAULT; | |
4b11111a MS |
210 | result = udf_relocate_blocks(inode->i_sb, |
211 | old_block, &new_block); | |
212 | if (result == 0) | |
28de7948 CG |
213 | result = put_user(new_block, (long __user *)arg); |
214 | return result; | |
cb00ea35 | 215 | case UDF_GETEASIZE: |
c0b34438 | 216 | result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); |
cb00ea35 | 217 | break; |
cb00ea35 | 218 | case UDF_GETEABLOCK: |
c0b34438 MS |
219 | result = copy_to_user((char __user *)arg, |
220 | UDF_I(inode)->i_ext.i_data, | |
221 | UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; | |
cb00ea35 | 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 = { |
28de7948 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 | }; |