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1 | /* |
2 | * file.c |
3 | * |
4 | * PURPOSE |
5 | * File handling routines for the OSTA-UDF(tm) filesystem. |
6 | * |
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 <asm/uaccess.h> |
31 | #include <linux/kernel.h> |
32 | #include <linux/string.h> /* memset */ |
33 | #include <linux/capability.h> |
34 | #include <linux/errno.h> |
35 | #include <linux/smp_lock.h> |
36 | #include <linux/pagemap.h> |
37 | #include <linux/quotaops.h> |
38 | #include <linux/buffer_head.h> |
39 | #include <linux/aio.h> |
40 | |
41 | #include "udf_i.h" |
42 | #include "udf_sb.h" |
43 | |
44 | static int udf_adinicb_readpage(struct file *file, struct page *page) |
45 | { |
46 | struct inode *inode = page->mapping->host; |
47 | char *kaddr; |
48 | struct udf_inode_info *iinfo = UDF_I(inode); |
49 | |
50 | BUG_ON(!PageLocked(page)); |
51 | |
52 | kaddr = kmap(page); |
53 | memset(kaddr, 0, PAGE_CACHE_SIZE); |
54 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); |
55 | flush_dcache_page(page); |
56 | SetPageUptodate(page); |
57 | kunmap(page); |
58 | unlock_page(page); |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | static int udf_adinicb_writepage(struct page *page, |
64 | struct writeback_control *wbc) |
65 | { |
66 | struct inode *inode = page->mapping->host; |
67 | char *kaddr; |
68 | struct udf_inode_info *iinfo = UDF_I(inode); |
69 | |
70 | BUG_ON(!PageLocked(page)); |
71 | |
72 | kaddr = kmap(page); |
73 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); |
74 | mark_inode_dirty(inode); |
75 | SetPageUptodate(page); |
76 | kunmap(page); |
77 | unlock_page(page); |
78 | |
79 | return 0; |
80 | } |
81 | |
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) |
86 | { |
87 | struct inode *inode = mapping->host; |
88 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
89 | char *kaddr; |
90 | struct udf_inode_info *iinfo = UDF_I(inode); |
91 | |
92 | kaddr = kmap_atomic(page, KM_USER0); |
93 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset, |
94 | kaddr + offset, copied); |
95 | kunmap_atomic(kaddr, KM_USER0); |
96 | |
97 | return simple_write_end(file, mapping, pos, len, copied, page, fsdata); |
98 | } |
99 | |
100 | const struct address_space_operations udf_adinicb_aops = { |
101 | .readpage = udf_adinicb_readpage, |
102 | .writepage = udf_adinicb_writepage, |
103 | .sync_page = block_sync_page, |
104 | .write_begin = simple_write_begin, |
105 | .write_end = udf_adinicb_write_end, |
106 | }; |
107 | |
108 | static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
109 | unsigned long nr_segs, loff_t ppos) |
110 | { |
111 | ssize_t retval; |
112 | struct file *file = iocb->ki_filp; |
113 | struct inode *inode = file->f_path.dentry->d_inode; |
114 | int err, pos; |
115 | size_t count = iocb->ki_left; |
116 | struct udf_inode_info *iinfo = UDF_I(inode); |
117 | |
118 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
119 | if (file->f_flags & O_APPEND) |
120 | pos = inode->i_size; |
121 | else |
122 | pos = ppos; |
123 | |
124 | if (inode->i_sb->s_blocksize < |
125 | (udf_file_entry_alloc_offset(inode) + |
126 | pos + count)) { |
127 | udf_expand_file_adinicb(inode, pos + count, &err); |
128 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
129 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
130 | return err; |
131 | } |
132 | } else { |
133 | if (pos + count > inode->i_size) |
134 | iinfo->i_lenAlloc = pos + count; |
135 | else |
136 | iinfo->i_lenAlloc = inode->i_size; |
137 | } |
138 | } |
139 | |
140 | retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
141 | if (retval > 0) |
142 | mark_inode_dirty(inode); |
143 | |
144 | return retval; |
145 | } |
146 | |
147 | int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
148 | unsigned long arg) |
149 | { |
150 | long old_block, new_block; |
151 | int result = -EINVAL; |
152 | |
153 | if (file_permission(filp, MAY_READ) != 0) { |
154 | udf_debug("no permission to access inode %lu\n", |
155 | inode->i_ino); |
156 | return -EPERM; |
157 | } |
158 | |
159 | if (!arg) { |
160 | udf_debug("invalid argument to udf_ioctl\n"); |
161 | return -EINVAL; |
162 | } |
163 | |
164 | switch (cmd) { |
165 | case UDF_GETVOLIDENT: |
166 | if (copy_to_user((char __user *)arg, |
167 | UDF_SB(inode->i_sb)->s_volume_ident, 32)) |
168 | return -EFAULT; |
169 | else |
170 | return 0; |
171 | case UDF_RELOCATE_BLOCKS: |
172 | if (!capable(CAP_SYS_ADMIN)) |
173 | return -EACCES; |
174 | if (get_user(old_block, (long __user *)arg)) |
175 | return -EFAULT; |
176 | result = udf_relocate_blocks(inode->i_sb, |
177 | old_block, &new_block); |
178 | if (result == 0) |
179 | result = put_user(new_block, (long __user *)arg); |
180 | return result; |
181 | case UDF_GETEASIZE: |
182 | result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); |
183 | break; |
184 | case UDF_GETEABLOCK: |
185 | result = copy_to_user((char __user *)arg, |
186 | UDF_I(inode)->i_ext.i_data, |
187 | UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; |
188 | break; |
189 | } |
190 | |
191 | return result; |
192 | } |
193 | |
194 | static int udf_release_file(struct inode *inode, struct file *filp) |
195 | { |
196 | if (filp->f_mode & FMODE_WRITE) { |
197 | mutex_lock(&inode->i_mutex); |
198 | lock_kernel(); |
199 | udf_discard_prealloc(inode); |
200 | udf_truncate_tail_extent(inode); |
201 | unlock_kernel(); |
202 | mutex_unlock(&inode->i_mutex); |
203 | } |
204 | return 0; |
205 | } |
206 | |
207 | const struct file_operations udf_file_operations = { |
208 | .read = do_sync_read, |
209 | .aio_read = generic_file_aio_read, |
210 | .ioctl = udf_ioctl, |
211 | .open = dquot_file_open, |
212 | .mmap = generic_file_mmap, |
213 | .write = do_sync_write, |
214 | .aio_write = udf_file_aio_write, |
215 | .release = udf_release_file, |
216 | .fsync = simple_fsync, |
217 | .splice_read = generic_file_splice_read, |
218 | .llseek = generic_file_llseek, |
219 | }; |
220 | |
221 | int udf_setattr(struct dentry *dentry, struct iattr *iattr) |
222 | { |
223 | struct inode *inode = dentry->d_inode; |
224 | int error; |
225 | |
226 | error = inode_change_ok(inode, iattr); |
227 | if (error) |
228 | return error; |
229 | |
230 | if (iattr->ia_valid & ATTR_SIZE) |
231 | dquot_initialize(inode); |
232 | |
233 | if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || |
234 | (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { |
235 | error = dquot_transfer(inode, iattr); |
236 | if (error) |
237 | return error; |
238 | } |
239 | |
240 | return inode_setattr(inode, iattr); |
241 | } |
242 | |
243 | const struct inode_operations udf_file_inode_operations = { |
244 | .truncate = udf_truncate, |
245 | .setattr = udf_setattr, |
246 | }; |
247 |
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