5 * File handling routines for the OSTA-UDF(tm) filesystem.
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.
13 * (C) 1998-1999 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
19 * 10/02/98 dgb Attempt to integrate into udf.o
20 * 10/07/98 Switched to using generic_readpage, etc., like isofs
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
30 #include <linux/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/pagemap.h>
36 #include <linux/buffer_head.h>
37 #include <linux/aio.h>
42 static void __udf_adinicb_readpage(struct page *page)
44 struct inode *inode = page->mapping->host;
46 struct udf_inode_info *iinfo = UDF_I(inode);
49 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
50 memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size);
51 flush_dcache_page(page);
52 SetPageUptodate(page);
56 static int udf_adinicb_readpage(struct file *file, struct page *page)
58 BUG_ON(!PageLocked(page));
59 __udf_adinicb_readpage(page);
65 static int udf_adinicb_writepage(struct page *page,
66 struct writeback_control *wbc)
68 struct inode *inode = page->mapping->host;
70 struct udf_inode_info *iinfo = UDF_I(inode);
72 BUG_ON(!PageLocked(page));
75 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
76 mark_inode_dirty(inode);
77 SetPageUptodate(page);
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,
91 if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE))
93 page = grab_cache_page_write_begin(mapping, 0, flags);
98 if (!PageUptodate(page) && len != PAGE_CACHE_SIZE)
99 __udf_adinicb_readpage(page);
103 static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
104 struct iov_iter *iter,
107 /* Fallback to buffered I/O. */
111 const struct address_space_operations udf_adinicb_aops = {
112 .readpage = udf_adinicb_readpage,
113 .writepage = udf_adinicb_writepage,
114 .write_begin = udf_adinicb_write_begin,
115 .write_end = simple_write_end,
116 .direct_IO = udf_adinicb_direct_IO,
119 static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
122 struct file *file = iocb->ki_filp;
123 struct inode *inode = file_inode(file);
125 size_t count = iocb->ki_nbytes;
126 struct udf_inode_info *iinfo = UDF_I(inode);
128 mutex_lock(&inode->i_mutex);
129 down_write(&iinfo->i_data_sem);
130 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
131 if (file->f_flags & O_APPEND)
136 if (inode->i_sb->s_blocksize <
137 (udf_file_entry_alloc_offset(inode) +
139 err = udf_expand_file_adinicb(inode);
141 mutex_unlock(&inode->i_mutex);
142 udf_debug("udf_expand_adinicb: err=%d\n", err);
146 if (pos + count > inode->i_size)
147 iinfo->i_lenAlloc = pos + count;
149 iinfo->i_lenAlloc = inode->i_size;
150 up_write(&iinfo->i_data_sem);
153 up_write(&iinfo->i_data_sem);
155 retval = __generic_file_write_iter(iocb, from);
156 mutex_unlock(&inode->i_mutex);
161 mark_inode_dirty(inode);
162 err = generic_write_sync(file, iocb->ki_pos - retval, retval);
170 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
172 struct inode *inode = file_inode(filp);
173 long old_block, new_block;
174 int result = -EINVAL;
176 if (inode_permission(inode, MAY_READ) != 0) {
177 udf_debug("no permission to access inode %lu\n", inode->i_ino);
183 udf_debug("invalid argument to udf_ioctl\n");
189 case UDF_GETVOLIDENT:
190 if (copy_to_user((char __user *)arg,
191 UDF_SB(inode->i_sb)->s_volume_ident, 32))
196 case UDF_RELOCATE_BLOCKS:
197 if (!capable(CAP_SYS_ADMIN)) {
201 if (get_user(old_block, (long __user *)arg)) {
205 result = udf_relocate_blocks(inode->i_sb,
206 old_block, &new_block);
208 result = put_user(new_block, (long __user *)arg);
211 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
214 result = copy_to_user((char __user *)arg,
215 UDF_I(inode)->i_ext.i_data,
216 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
224 static int udf_release_file(struct inode *inode, struct file *filp)
226 if (filp->f_mode & FMODE_WRITE &&
227 atomic_read(&inode->i_writecount) == 1) {
229 * Grab i_mutex to avoid races with writes changing i_size
230 * while we are running.
232 mutex_lock(&inode->i_mutex);
233 down_write(&UDF_I(inode)->i_data_sem);
234 udf_discard_prealloc(inode);
235 udf_truncate_tail_extent(inode);
236 up_write(&UDF_I(inode)->i_data_sem);
237 mutex_unlock(&inode->i_mutex);
242 const struct file_operations udf_file_operations = {
243 .read = new_sync_read,
244 .read_iter = generic_file_read_iter,
245 .unlocked_ioctl = udf_ioctl,
246 .open = generic_file_open,
247 .mmap = generic_file_mmap,
248 .write = new_sync_write,
249 .write_iter = udf_file_write_iter,
250 .release = udf_release_file,
251 .fsync = generic_file_fsync,
252 .splice_read = generic_file_splice_read,
253 .llseek = generic_file_llseek,
256 static int udf_setattr(struct dentry *dentry, struct iattr *attr)
258 struct inode *inode = dentry->d_inode;
261 error = inode_change_ok(inode, attr);
265 if ((attr->ia_valid & ATTR_SIZE) &&
266 attr->ia_size != i_size_read(inode)) {
267 error = udf_setsize(inode, attr->ia_size);
272 setattr_copy(inode, attr);
273 mark_inode_dirty(inode);
277 const struct inode_operations udf_file_inode_operations = {
278 .setattr = udf_setattr,