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 | 35 | #include <linux/pagemap.h> |
e2e40f2c | 36 | #include <linux/uio.h> |
1da177e4 LT |
37 | |
38 | #include "udf_i.h" | |
39 | #include "udf_sb.h" | |
40 | ||
9c2fc0de | 41 | static void __udf_adinicb_readpage(struct page *page) |
1da177e4 LT |
42 | { |
43 | struct inode *inode = page->mapping->host; | |
44 | char *kaddr; | |
48d6d8ff | 45 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 46 | |
1da177e4 | 47 | kaddr = kmap(page); |
48d6d8ff | 48 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); |
9c2fc0de | 49 | memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size); |
1da177e4 LT |
50 | flush_dcache_page(page); |
51 | SetPageUptodate(page); | |
52 | kunmap(page); | |
9c2fc0de JK |
53 | } |
54 | ||
55 | static int udf_adinicb_readpage(struct file *file, struct page *page) | |
56 | { | |
57 | BUG_ON(!PageLocked(page)); | |
58 | __udf_adinicb_readpage(page); | |
1da177e4 | 59 | unlock_page(page); |
28de7948 | 60 | |
1da177e4 LT |
61 | return 0; |
62 | } | |
63 | ||
4b11111a MS |
64 | static int udf_adinicb_writepage(struct page *page, |
65 | struct writeback_control *wbc) | |
1da177e4 LT |
66 | { |
67 | struct inode *inode = page->mapping->host; | |
68 | char *kaddr; | |
48d6d8ff | 69 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 70 | |
cd7619d6 | 71 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
72 | |
73 | kaddr = kmap(page); | |
48d6d8ff | 74 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); |
1da177e4 LT |
75 | mark_inode_dirty(inode); |
76 | SetPageUptodate(page); | |
77 | kunmap(page); | |
78 | unlock_page(page); | |
28de7948 | 79 | |
1da177e4 LT |
80 | return 0; |
81 | } | |
82 | ||
9c2fc0de JK |
83 | static int udf_adinicb_write_begin(struct file *file, |
84 | struct address_space *mapping, loff_t pos, | |
85 | unsigned len, unsigned flags, struct page **pagep, | |
86 | void **fsdata) | |
87 | { | |
88 | struct page *page; | |
89 | ||
90 | if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE)) | |
91 | return -EIO; | |
92 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
93 | if (!page) | |
94 | return -ENOMEM; | |
95 | *pagep = page; | |
96 | ||
97 | if (!PageUptodate(page) && len != PAGE_CACHE_SIZE) | |
98 | __udf_adinicb_readpage(page); | |
99 | return 0; | |
100 | } | |
101 | ||
22c6186e | 102 | static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
d8d3d94b | 103 | loff_t offset) |
5eec54fc IA |
104 | { |
105 | /* Fallback to buffered I/O. */ | |
106 | return 0; | |
107 | } | |
108 | ||
f5e54d6e | 109 | const struct address_space_operations udf_adinicb_aops = { |
28de7948 CG |
110 | .readpage = udf_adinicb_readpage, |
111 | .writepage = udf_adinicb_writepage, | |
9c2fc0de | 112 | .write_begin = udf_adinicb_write_begin, |
3f1be4f9 | 113 | .write_end = simple_write_end, |
5eec54fc | 114 | .direct_IO = udf_adinicb_direct_IO, |
1da177e4 LT |
115 | }; |
116 | ||
d4637bc1 | 117 | static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 LT |
118 | { |
119 | ssize_t retval; | |
543ade1f | 120 | struct file *file = iocb->ki_filp; |
496ad9aa | 121 | struct inode *inode = file_inode(file); |
48d6d8ff | 122 | struct udf_inode_info *iinfo = UDF_I(inode); |
165f1a6e | 123 | int err; |
1da177e4 | 124 | |
5955102c | 125 | inode_lock(inode); |
165f1a6e | 126 | |
3309dd04 AV |
127 | retval = generic_write_checks(iocb, from); |
128 | if (retval <= 0) | |
165f1a6e AV |
129 | goto out; |
130 | ||
8754a3f7 | 131 | down_write(&iinfo->i_data_sem); |
48d6d8ff | 132 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
165f1a6e | 133 | loff_t end = iocb->ki_pos + iov_iter_count(from); |
1da177e4 | 134 | |
4b11111a | 135 | if (inode->i_sb->s_blocksize < |
165f1a6e | 136 | (udf_file_entry_alloc_offset(inode) + end)) { |
7e49b6f2 JK |
137 | err = udf_expand_file_adinicb(inode); |
138 | if (err) { | |
5955102c | 139 | inode_unlock(inode); |
1da177e4 LT |
140 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
141 | return err; | |
142 | } | |
cb00ea35 | 143 | } else { |
165f1a6e | 144 | iinfo->i_lenAlloc = max(end, inode->i_size); |
d2eb8c35 | 145 | up_write(&iinfo->i_data_sem); |
1da177e4 | 146 | } |
d2eb8c35 JK |
147 | } else |
148 | up_write(&iinfo->i_data_sem); | |
1da177e4 | 149 | |
d4637bc1 | 150 | retval = __generic_file_write_iter(iocb, from); |
5f380c7f | 151 | out: |
5955102c | 152 | inode_unlock(inode); |
09ebb17a JK |
153 | |
154 | if (retval > 0) { | |
1da177e4 | 155 | mark_inode_dirty(inode); |
09ebb17a JK |
156 | err = generic_write_sync(file, iocb->ki_pos - retval, retval); |
157 | if (err < 0) | |
158 | retval = err; | |
159 | } | |
28de7948 | 160 | |
1da177e4 LT |
161 | return retval; |
162 | } | |
163 | ||
2f07a88b | 164 | long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 165 | { |
496ad9aa | 166 | struct inode *inode = file_inode(filp); |
28de7948 | 167 | long old_block, new_block; |
1da177e4 LT |
168 | int result = -EINVAL; |
169 | ||
6f286109 | 170 | if (inode_permission(inode, MAY_READ) != 0) { |
2f07a88b JK |
171 | udf_debug("no permission to access inode %lu\n", inode->i_ino); |
172 | result = -EPERM; | |
173 | goto out; | |
1da177e4 LT |
174 | } |
175 | ||
cb00ea35 | 176 | if (!arg) { |
1da177e4 | 177 | udf_debug("invalid argument to udf_ioctl\n"); |
2f07a88b JK |
178 | result = -EINVAL; |
179 | goto out; | |
1da177e4 LT |
180 | } |
181 | ||
cb00ea35 CG |
182 | switch (cmd) { |
183 | case UDF_GETVOLIDENT: | |
4b11111a MS |
184 | if (copy_to_user((char __user *)arg, |
185 | UDF_SB(inode->i_sb)->s_volume_ident, 32)) | |
2f07a88b | 186 | result = -EFAULT; |
4b11111a | 187 | else |
2f07a88b JK |
188 | result = 0; |
189 | goto out; | |
cb00ea35 | 190 | case UDF_RELOCATE_BLOCKS: |
2f07a88b | 191 | if (!capable(CAP_SYS_ADMIN)) { |
41735818 | 192 | result = -EPERM; |
2f07a88b JK |
193 | goto out; |
194 | } | |
195 | if (get_user(old_block, (long __user *)arg)) { | |
196 | result = -EFAULT; | |
197 | goto out; | |
198 | } | |
4b11111a MS |
199 | result = udf_relocate_blocks(inode->i_sb, |
200 | old_block, &new_block); | |
201 | if (result == 0) | |
28de7948 | 202 | result = put_user(new_block, (long __user *)arg); |
2f07a88b | 203 | goto out; |
cb00ea35 | 204 | case UDF_GETEASIZE: |
c0b34438 | 205 | result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); |
2f07a88b | 206 | goto out; |
cb00ea35 | 207 | case UDF_GETEABLOCK: |
c0b34438 MS |
208 | result = copy_to_user((char __user *)arg, |
209 | UDF_I(inode)->i_ext.i_data, | |
210 | UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; | |
2f07a88b | 211 | goto out; |
1da177e4 LT |
212 | } |
213 | ||
2f07a88b | 214 | out: |
1da177e4 LT |
215 | return result; |
216 | } | |
217 | ||
cb00ea35 | 218 | static int udf_release_file(struct inode *inode, struct file *filp) |
1da177e4 | 219 | { |
6fb1ca92 | 220 | if (filp->f_mode & FMODE_WRITE && |
b07ef352 | 221 | atomic_read(&inode->i_writecount) == 1) { |
6fb1ca92 JK |
222 | /* |
223 | * Grab i_mutex to avoid races with writes changing i_size | |
224 | * while we are running. | |
225 | */ | |
5955102c | 226 | inode_lock(inode); |
4d0fb621 | 227 | down_write(&UDF_I(inode)->i_data_sem); |
1da177e4 | 228 | udf_discard_prealloc(inode); |
2c948b3f | 229 | udf_truncate_tail_extent(inode); |
4d0fb621 | 230 | up_write(&UDF_I(inode)->i_data_sem); |
5955102c | 231 | inode_unlock(inode); |
1da177e4 LT |
232 | } |
233 | return 0; | |
234 | } | |
235 | ||
4b6f5d20 | 236 | const struct file_operations udf_file_operations = { |
aad4f8bb | 237 | .read_iter = generic_file_read_iter, |
2f07a88b | 238 | .unlocked_ioctl = udf_ioctl, |
36350462 | 239 | .open = generic_file_open, |
28de7948 | 240 | .mmap = generic_file_mmap, |
d4637bc1 | 241 | .write_iter = udf_file_write_iter, |
28de7948 | 242 | .release = udf_release_file, |
1b061d92 | 243 | .fsync = generic_file_fsync, |
28de7948 | 244 | .splice_read = generic_file_splice_read, |
5c89468c | 245 | .llseek = generic_file_llseek, |
1da177e4 LT |
246 | }; |
247 | ||
d39aae9e CH |
248 | static int udf_setattr(struct dentry *dentry, struct iattr *attr) |
249 | { | |
2b0143b5 | 250 | struct inode *inode = d_inode(dentry); |
d39aae9e CH |
251 | int error; |
252 | ||
253 | error = inode_change_ok(inode, attr); | |
254 | if (error) | |
255 | return error; | |
1025774c CH |
256 | |
257 | if ((attr->ia_valid & ATTR_SIZE) && | |
258 | attr->ia_size != i_size_read(inode)) { | |
7e49b6f2 | 259 | error = udf_setsize(inode, attr->ia_size); |
1025774c CH |
260 | if (error) |
261 | return error; | |
262 | } | |
263 | ||
264 | setattr_copy(inode, attr); | |
265 | mark_inode_dirty(inode); | |
266 | return 0; | |
d39aae9e CH |
267 | } |
268 | ||
c5ef1c42 | 269 | const struct inode_operations udf_file_inode_operations = { |
d39aae9e | 270 | .setattr = udf_setattr, |
1da177e4 | 271 | }; |