Commit | Line | Data |
---|---|---|
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> | |
e973606c | 30 | #include <linux/uaccess.h> |
1da177e4 | 31 | #include <linux/kernel.h> |
28de7948 | 32 | #include <linux/string.h> /* memset */ |
16f7e0fe | 33 | #include <linux/capability.h> |
1da177e4 | 34 | #include <linux/errno.h> |
1da177e4 LT |
35 | #include <linux/pagemap.h> |
36 | #include <linux/buffer_head.h> | |
e8edc6e0 | 37 | #include <linux/aio.h> |
1da177e4 LT |
38 | |
39 | #include "udf_i.h" | |
40 | #include "udf_sb.h" | |
41 | ||
9c2fc0de | 42 | static void __udf_adinicb_readpage(struct page *page) |
1da177e4 LT |
43 | { |
44 | struct inode *inode = page->mapping->host; | |
45 | char *kaddr; | |
48d6d8ff | 46 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 47 | |
1da177e4 | 48 | kaddr = kmap(page); |
48d6d8ff | 49 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); |
9c2fc0de | 50 | memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size); |
1da177e4 LT |
51 | flush_dcache_page(page); |
52 | SetPageUptodate(page); | |
53 | kunmap(page); | |
9c2fc0de JK |
54 | } |
55 | ||
56 | static int udf_adinicb_readpage(struct file *file, struct page *page) | |
57 | { | |
58 | BUG_ON(!PageLocked(page)); | |
59 | __udf_adinicb_readpage(page); | |
1da177e4 | 60 | unlock_page(page); |
28de7948 | 61 | |
1da177e4 LT |
62 | return 0; |
63 | } | |
64 | ||
4b11111a MS |
65 | static int udf_adinicb_writepage(struct page *page, |
66 | struct writeback_control *wbc) | |
1da177e4 LT |
67 | { |
68 | struct inode *inode = page->mapping->host; | |
69 | char *kaddr; | |
48d6d8ff | 70 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 71 | |
cd7619d6 | 72 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
73 | |
74 | kaddr = kmap(page); | |
48d6d8ff | 75 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); |
1da177e4 LT |
76 | mark_inode_dirty(inode); |
77 | SetPageUptodate(page); | |
78 | kunmap(page); | |
79 | unlock_page(page); | |
28de7948 | 80 | |
1da177e4 LT |
81 | return 0; |
82 | } | |
83 | ||
9c2fc0de JK |
84 | static int udf_adinicb_write_begin(struct file *file, |
85 | struct address_space *mapping, loff_t pos, | |
86 | unsigned len, unsigned flags, struct page **pagep, | |
87 | void **fsdata) | |
88 | { | |
89 | struct page *page; | |
90 | ||
91 | if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE)) | |
92 | return -EIO; | |
93 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
94 | if (!page) | |
95 | return -ENOMEM; | |
96 | *pagep = page; | |
97 | ||
98 | if (!PageUptodate(page) && len != PAGE_CACHE_SIZE) | |
99 | __udf_adinicb_readpage(page); | |
100 | return 0; | |
101 | } | |
102 | ||
5eec54fc | 103 | static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb, |
d8d3d94b AV |
104 | struct iov_iter *iter, |
105 | loff_t offset) | |
5eec54fc IA |
106 | { |
107 | /* Fallback to buffered I/O. */ | |
108 | return 0; | |
109 | } | |
110 | ||
f5e54d6e | 111 | const struct address_space_operations udf_adinicb_aops = { |
28de7948 CG |
112 | .readpage = udf_adinicb_readpage, |
113 | .writepage = udf_adinicb_writepage, | |
9c2fc0de | 114 | .write_begin = udf_adinicb_write_begin, |
3f1be4f9 | 115 | .write_end = simple_write_end, |
5eec54fc | 116 | .direct_IO = udf_adinicb_direct_IO, |
1da177e4 LT |
117 | }; |
118 | ||
d4637bc1 | 119 | static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 LT |
120 | { |
121 | ssize_t retval; | |
543ade1f | 122 | struct file *file = iocb->ki_filp; |
496ad9aa | 123 | struct inode *inode = file_inode(file); |
1da177e4 | 124 | int err, pos; |
73a7075e | 125 | size_t count = iocb->ki_nbytes; |
48d6d8ff | 126 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 127 | |
09ebb17a | 128 | mutex_lock(&inode->i_mutex); |
8754a3f7 | 129 | down_write(&iinfo->i_data_sem); |
48d6d8ff | 130 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 LT |
131 | if (file->f_flags & O_APPEND) |
132 | pos = inode->i_size; | |
133 | else | |
d4637bc1 | 134 | pos = iocb->ki_pos; |
1da177e4 | 135 | |
4b11111a MS |
136 | if (inode->i_sb->s_blocksize < |
137 | (udf_file_entry_alloc_offset(inode) + | |
28de7948 | 138 | pos + count)) { |
7e49b6f2 JK |
139 | err = udf_expand_file_adinicb(inode); |
140 | if (err) { | |
09ebb17a | 141 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
142 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
143 | return err; | |
144 | } | |
cb00ea35 | 145 | } else { |
1da177e4 | 146 | if (pos + count > inode->i_size) |
48d6d8ff | 147 | iinfo->i_lenAlloc = pos + count; |
1da177e4 | 148 | else |
48d6d8ff | 149 | iinfo->i_lenAlloc = inode->i_size; |
d2eb8c35 | 150 | up_write(&iinfo->i_data_sem); |
1da177e4 | 151 | } |
d2eb8c35 JK |
152 | } else |
153 | up_write(&iinfo->i_data_sem); | |
1da177e4 | 154 | |
d4637bc1 | 155 | retval = __generic_file_write_iter(iocb, from); |
09ebb17a JK |
156 | mutex_unlock(&inode->i_mutex); |
157 | ||
158 | if (retval > 0) { | |
159 | ssize_t err; | |
160 | ||
1da177e4 | 161 | mark_inode_dirty(inode); |
09ebb17a JK |
162 | err = generic_write_sync(file, iocb->ki_pos - retval, retval); |
163 | if (err < 0) | |
164 | retval = err; | |
165 | } | |
28de7948 | 166 | |
1da177e4 LT |
167 | return retval; |
168 | } | |
169 | ||
2f07a88b | 170 | long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 171 | { |
496ad9aa | 172 | struct inode *inode = file_inode(filp); |
28de7948 | 173 | long old_block, new_block; |
1da177e4 LT |
174 | int result = -EINVAL; |
175 | ||
6f286109 | 176 | if (inode_permission(inode, MAY_READ) != 0) { |
2f07a88b JK |
177 | udf_debug("no permission to access inode %lu\n", inode->i_ino); |
178 | result = -EPERM; | |
179 | goto out; | |
1da177e4 LT |
180 | } |
181 | ||
cb00ea35 | 182 | if (!arg) { |
1da177e4 | 183 | udf_debug("invalid argument to udf_ioctl\n"); |
2f07a88b JK |
184 | result = -EINVAL; |
185 | goto out; | |
1da177e4 LT |
186 | } |
187 | ||
cb00ea35 CG |
188 | switch (cmd) { |
189 | case UDF_GETVOLIDENT: | |
4b11111a MS |
190 | if (copy_to_user((char __user *)arg, |
191 | UDF_SB(inode->i_sb)->s_volume_ident, 32)) | |
2f07a88b | 192 | result = -EFAULT; |
4b11111a | 193 | else |
2f07a88b JK |
194 | result = 0; |
195 | goto out; | |
cb00ea35 | 196 | case UDF_RELOCATE_BLOCKS: |
2f07a88b | 197 | if (!capable(CAP_SYS_ADMIN)) { |
41735818 | 198 | result = -EPERM; |
2f07a88b JK |
199 | goto out; |
200 | } | |
201 | if (get_user(old_block, (long __user *)arg)) { | |
202 | result = -EFAULT; | |
203 | goto out; | |
204 | } | |
4b11111a MS |
205 | result = udf_relocate_blocks(inode->i_sb, |
206 | old_block, &new_block); | |
207 | if (result == 0) | |
28de7948 | 208 | result = put_user(new_block, (long __user *)arg); |
2f07a88b | 209 | goto out; |
cb00ea35 | 210 | case UDF_GETEASIZE: |
c0b34438 | 211 | result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); |
2f07a88b | 212 | goto out; |
cb00ea35 | 213 | case UDF_GETEABLOCK: |
c0b34438 MS |
214 | result = copy_to_user((char __user *)arg, |
215 | UDF_I(inode)->i_ext.i_data, | |
216 | UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; | |
2f07a88b | 217 | goto out; |
1da177e4 LT |
218 | } |
219 | ||
2f07a88b | 220 | out: |
1da177e4 LT |
221 | return result; |
222 | } | |
223 | ||
cb00ea35 | 224 | static int udf_release_file(struct inode *inode, struct file *filp) |
1da177e4 | 225 | { |
6fb1ca92 | 226 | if (filp->f_mode & FMODE_WRITE && |
b07ef352 | 227 | atomic_read(&inode->i_writecount) == 1) { |
6fb1ca92 JK |
228 | /* |
229 | * Grab i_mutex to avoid races with writes changing i_size | |
230 | * while we are running. | |
231 | */ | |
232 | mutex_lock(&inode->i_mutex); | |
4d0fb621 | 233 | down_write(&UDF_I(inode)->i_data_sem); |
1da177e4 | 234 | udf_discard_prealloc(inode); |
2c948b3f | 235 | udf_truncate_tail_extent(inode); |
4d0fb621 | 236 | up_write(&UDF_I(inode)->i_data_sem); |
6fb1ca92 | 237 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
238 | } |
239 | return 0; | |
240 | } | |
241 | ||
4b6f5d20 | 242 | const struct file_operations udf_file_operations = { |
aad4f8bb AV |
243 | .read = new_sync_read, |
244 | .read_iter = generic_file_read_iter, | |
2f07a88b | 245 | .unlocked_ioctl = udf_ioctl, |
36350462 | 246 | .open = generic_file_open, |
28de7948 | 247 | .mmap = generic_file_mmap, |
d4637bc1 AV |
248 | .write = new_sync_write, |
249 | .write_iter = udf_file_write_iter, | |
28de7948 | 250 | .release = udf_release_file, |
1b061d92 | 251 | .fsync = generic_file_fsync, |
28de7948 | 252 | .splice_read = generic_file_splice_read, |
5c89468c | 253 | .llseek = generic_file_llseek, |
1da177e4 LT |
254 | }; |
255 | ||
d39aae9e CH |
256 | static int udf_setattr(struct dentry *dentry, struct iattr *attr) |
257 | { | |
258 | struct inode *inode = dentry->d_inode; | |
259 | int error; | |
260 | ||
261 | error = inode_change_ok(inode, attr); | |
262 | if (error) | |
263 | return error; | |
1025774c CH |
264 | |
265 | if ((attr->ia_valid & ATTR_SIZE) && | |
266 | attr->ia_size != i_size_read(inode)) { | |
7e49b6f2 | 267 | error = udf_setsize(inode, attr->ia_size); |
1025774c CH |
268 | if (error) |
269 | return error; | |
270 | } | |
271 | ||
272 | setattr_copy(inode, attr); | |
273 | mark_inode_dirty(inode); | |
274 | return 0; | |
d39aae9e CH |
275 | } |
276 | ||
c5ef1c42 | 277 | const struct inode_operations udf_file_inode_operations = { |
d39aae9e | 278 | .setattr = udf_setattr, |
1da177e4 | 279 | }; |