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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> | |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <linux/kernel.h> | |
28de7948 | 32 | #include <linux/string.h> /* memset */ |
16f7e0fe | 33 | #include <linux/capability.h> |
1da177e4 LT |
34 | #include <linux/errno.h> |
35 | #include <linux/smp_lock.h> | |
36 | #include <linux/pagemap.h> | |
37 | #include <linux/buffer_head.h> | |
e8edc6e0 | 38 | #include <linux/aio.h> |
1da177e4 LT |
39 | |
40 | #include "udf_i.h" | |
41 | #include "udf_sb.h" | |
42 | ||
cb00ea35 | 43 | static int udf_adinicb_readpage(struct file *file, struct page *page) |
1da177e4 LT |
44 | { |
45 | struct inode *inode = page->mapping->host; | |
46 | char *kaddr; | |
48d6d8ff | 47 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 48 | |
cd7619d6 | 49 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
50 | |
51 | kaddr = kmap(page); | |
52 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
48d6d8ff | 53 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); |
1da177e4 LT |
54 | flush_dcache_page(page); |
55 | SetPageUptodate(page); | |
56 | kunmap(page); | |
57 | unlock_page(page); | |
28de7948 | 58 | |
1da177e4 LT |
59 | return 0; |
60 | } | |
61 | ||
4b11111a MS |
62 | static int udf_adinicb_writepage(struct page *page, |
63 | struct writeback_control *wbc) | |
1da177e4 LT |
64 | { |
65 | struct inode *inode = page->mapping->host; | |
66 | char *kaddr; | |
48d6d8ff | 67 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 68 | |
cd7619d6 | 69 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
70 | |
71 | kaddr = kmap(page); | |
48d6d8ff | 72 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); |
1da177e4 LT |
73 | mark_inode_dirty(inode); |
74 | SetPageUptodate(page); | |
75 | kunmap(page); | |
76 | unlock_page(page); | |
28de7948 | 77 | |
1da177e4 LT |
78 | return 0; |
79 | } | |
80 | ||
be021ee4 NP |
81 | static int udf_adinicb_write_end(struct file *file, |
82 | struct address_space *mapping, | |
83 | loff_t pos, unsigned len, unsigned copied, | |
84 | struct page *page, void *fsdata) | |
1da177e4 | 85 | { |
be021ee4 NP |
86 | struct inode *inode = mapping->host; |
87 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
88 | char *kaddr; | |
48d6d8ff | 89 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 90 | |
be021ee4 | 91 | kaddr = kmap_atomic(page, KM_USER0); |
48d6d8ff | 92 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset, |
be021ee4 NP |
93 | kaddr + offset, copied); |
94 | kunmap_atomic(kaddr, KM_USER0); | |
95 | ||
96 | return simple_write_end(file, mapping, pos, len, copied, page, fsdata); | |
1da177e4 LT |
97 | } |
98 | ||
f5e54d6e | 99 | const struct address_space_operations udf_adinicb_aops = { |
28de7948 CG |
100 | .readpage = udf_adinicb_readpage, |
101 | .writepage = udf_adinicb_writepage, | |
102 | .sync_page = block_sync_page, | |
be021ee4 NP |
103 | .write_begin = simple_write_begin, |
104 | .write_end = udf_adinicb_write_end, | |
1da177e4 LT |
105 | }; |
106 | ||
543ade1f | 107 | static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
cb00ea35 | 108 | unsigned long nr_segs, loff_t ppos) |
1da177e4 LT |
109 | { |
110 | ssize_t retval; | |
543ade1f | 111 | struct file *file = iocb->ki_filp; |
5096e933 | 112 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 | 113 | int err, pos; |
543ade1f | 114 | size_t count = iocb->ki_left; |
48d6d8ff | 115 | struct udf_inode_info *iinfo = UDF_I(inode); |
1da177e4 | 116 | |
48d6d8ff | 117 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 LT |
118 | if (file->f_flags & O_APPEND) |
119 | pos = inode->i_size; | |
120 | else | |
543ade1f | 121 | pos = ppos; |
1da177e4 | 122 | |
4b11111a MS |
123 | if (inode->i_sb->s_blocksize < |
124 | (udf_file_entry_alloc_offset(inode) + | |
28de7948 | 125 | pos + count)) { |
1da177e4 | 126 | udf_expand_file_adinicb(inode, pos + count, &err); |
48d6d8ff | 127 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 LT |
128 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
129 | return err; | |
130 | } | |
cb00ea35 | 131 | } else { |
1da177e4 | 132 | if (pos + count > inode->i_size) |
48d6d8ff | 133 | iinfo->i_lenAlloc = pos + count; |
1da177e4 | 134 | else |
48d6d8ff | 135 | iinfo->i_lenAlloc = inode->i_size; |
1da177e4 LT |
136 | } |
137 | } | |
138 | ||
543ade1f | 139 | retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
1da177e4 LT |
140 | if (retval > 0) |
141 | mark_inode_dirty(inode); | |
28de7948 | 142 | |
1da177e4 LT |
143 | return retval; |
144 | } | |
145 | ||
2f07a88b | 146 | long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 147 | { |
2f07a88b | 148 | struct inode *inode = filp->f_dentry->d_inode; |
28de7948 | 149 | long old_block, new_block; |
1da177e4 LT |
150 | int result = -EINVAL; |
151 | ||
2f07a88b JK |
152 | lock_kernel(); |
153 | ||
cb00ea35 | 154 | if (file_permission(filp, MAY_READ) != 0) { |
2f07a88b JK |
155 | udf_debug("no permission to access inode %lu\n", inode->i_ino); |
156 | result = -EPERM; | |
157 | goto out; | |
1da177e4 LT |
158 | } |
159 | ||
cb00ea35 | 160 | if (!arg) { |
1da177e4 | 161 | udf_debug("invalid argument to udf_ioctl\n"); |
2f07a88b JK |
162 | result = -EINVAL; |
163 | goto out; | |
1da177e4 LT |
164 | } |
165 | ||
cb00ea35 CG |
166 | switch (cmd) { |
167 | case UDF_GETVOLIDENT: | |
4b11111a MS |
168 | if (copy_to_user((char __user *)arg, |
169 | UDF_SB(inode->i_sb)->s_volume_ident, 32)) | |
2f07a88b | 170 | result = -EFAULT; |
4b11111a | 171 | else |
2f07a88b JK |
172 | result = 0; |
173 | goto out; | |
cb00ea35 | 174 | case UDF_RELOCATE_BLOCKS: |
2f07a88b JK |
175 | if (!capable(CAP_SYS_ADMIN)) { |
176 | result = -EACCES; | |
177 | goto out; | |
178 | } | |
179 | if (get_user(old_block, (long __user *)arg)) { | |
180 | result = -EFAULT; | |
181 | goto out; | |
182 | } | |
4b11111a MS |
183 | result = udf_relocate_blocks(inode->i_sb, |
184 | old_block, &new_block); | |
185 | if (result == 0) | |
28de7948 | 186 | result = put_user(new_block, (long __user *)arg); |
2f07a88b | 187 | goto out; |
cb00ea35 | 188 | case UDF_GETEASIZE: |
c0b34438 | 189 | result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); |
2f07a88b | 190 | goto out; |
cb00ea35 | 191 | case UDF_GETEABLOCK: |
c0b34438 MS |
192 | result = copy_to_user((char __user *)arg, |
193 | UDF_I(inode)->i_ext.i_data, | |
194 | UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; | |
2f07a88b | 195 | goto out; |
1da177e4 LT |
196 | } |
197 | ||
2f07a88b JK |
198 | out: |
199 | unlock_kernel(); | |
1da177e4 LT |
200 | return result; |
201 | } | |
202 | ||
cb00ea35 | 203 | static int udf_release_file(struct inode *inode, struct file *filp) |
1da177e4 | 204 | { |
cb00ea35 | 205 | if (filp->f_mode & FMODE_WRITE) { |
cbc8cc33 | 206 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
207 | lock_kernel(); |
208 | udf_discard_prealloc(inode); | |
2c948b3f | 209 | udf_truncate_tail_extent(inode); |
1da177e4 | 210 | unlock_kernel(); |
cbc8cc33 | 211 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
212 | } |
213 | return 0; | |
214 | } | |
215 | ||
4b6f5d20 | 216 | const struct file_operations udf_file_operations = { |
28de7948 CG |
217 | .read = do_sync_read, |
218 | .aio_read = generic_file_aio_read, | |
2f07a88b | 219 | .unlocked_ioctl = udf_ioctl, |
36350462 | 220 | .open = generic_file_open, |
28de7948 CG |
221 | .mmap = generic_file_mmap, |
222 | .write = do_sync_write, | |
223 | .aio_write = udf_file_aio_write, | |
224 | .release = udf_release_file, | |
1b061d92 | 225 | .fsync = generic_file_fsync, |
28de7948 | 226 | .splice_read = generic_file_splice_read, |
5c89468c | 227 | .llseek = generic_file_llseek, |
1da177e4 LT |
228 | }; |
229 | ||
d39aae9e CH |
230 | static int udf_setattr(struct dentry *dentry, struct iattr *attr) |
231 | { | |
232 | struct inode *inode = dentry->d_inode; | |
233 | int error; | |
234 | ||
235 | error = inode_change_ok(inode, attr); | |
236 | if (error) | |
237 | return error; | |
1025774c CH |
238 | |
239 | if ((attr->ia_valid & ATTR_SIZE) && | |
240 | attr->ia_size != i_size_read(inode)) { | |
241 | error = vmtruncate(inode, attr->ia_size); | |
242 | if (error) | |
243 | return error; | |
244 | } | |
245 | ||
246 | setattr_copy(inode, attr); | |
247 | mark_inode_dirty(inode); | |
248 | return 0; | |
d39aae9e CH |
249 | } |
250 | ||
c5ef1c42 | 251 | const struct inode_operations udf_file_inode_operations = { |
d39aae9e | 252 | .setattr = udf_setattr, |
759bfee6 | 253 | .truncate = udf_truncate, |
1da177e4 | 254 | }; |