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 <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/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);
47 loff_t isize = i_size_read(inode);
50 * We have to be careful here as truncate can change i_size under us.
51 * So just sample it once and use the same value everywhere.
54 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, isize);
55 memset(kaddr + isize, 0, PAGE_CACHE_SIZE - isize);
56 flush_dcache_page(page);
57 SetPageUptodate(page);
61 static int udf_adinicb_readpage(struct file *file, struct page *page)
63 BUG_ON(!PageLocked(page));
64 __udf_adinicb_readpage(page);
70 static int udf_adinicb_writepage(struct page *page,
71 struct writeback_control *wbc)
73 struct inode *inode = page->mapping->host;
75 struct udf_inode_info *iinfo = UDF_I(inode);
77 BUG_ON(!PageLocked(page));
80 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
81 mark_inode_dirty(inode);
82 SetPageUptodate(page);
89 static int udf_adinicb_write_begin(struct file *file,
90 struct address_space *mapping, loff_t pos,
91 unsigned len, unsigned flags, struct page **pagep,
96 if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE))
98 page = grab_cache_page_write_begin(mapping, 0, flags);
103 if (!PageUptodate(page) && len != PAGE_CACHE_SIZE)
104 __udf_adinicb_readpage(page);
108 static int udf_adinicb_write_end(struct file *file,
109 struct address_space *mapping,
110 loff_t pos, unsigned len, unsigned copied,
111 struct page *page, void *fsdata)
113 struct inode *inode = mapping->host;
114 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
116 struct udf_inode_info *iinfo = UDF_I(inode);
118 kaddr = kmap_atomic(page, KM_USER0);
119 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
120 kaddr + offset, copied);
121 kunmap_atomic(kaddr, KM_USER0);
123 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
126 const struct address_space_operations udf_adinicb_aops = {
127 .readpage = udf_adinicb_readpage,
128 .writepage = udf_adinicb_writepage,
129 .write_begin = udf_adinicb_write_begin,
130 .write_end = udf_adinicb_write_end,
133 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
134 unsigned long nr_segs, loff_t ppos)
137 struct file *file = iocb->ki_filp;
138 struct inode *inode = file->f_path.dentry->d_inode;
140 size_t count = iocb->ki_left;
141 struct udf_inode_info *iinfo = UDF_I(inode);
143 down_write(&iinfo->i_data_sem);
144 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
145 if (file->f_flags & O_APPEND)
150 if (inode->i_sb->s_blocksize <
151 (udf_file_entry_alloc_offset(inode) +
153 err = udf_expand_file_adinicb(inode);
155 udf_debug("udf_expand_adinicb: err=%d\n", err);
159 if (pos + count > inode->i_size)
160 iinfo->i_lenAlloc = pos + count;
162 iinfo->i_lenAlloc = inode->i_size;
163 up_write(&iinfo->i_data_sem);
166 up_write(&iinfo->i_data_sem);
168 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
170 mark_inode_dirty(inode);
175 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
177 struct inode *inode = filp->f_dentry->d_inode;
178 long old_block, new_block;
179 int result = -EINVAL;
181 if (inode_permission(inode, MAY_READ) != 0) {
182 udf_debug("no permission to access inode %lu\n", inode->i_ino);
188 udf_debug("invalid argument to udf_ioctl\n");
194 case UDF_GETVOLIDENT:
195 if (copy_to_user((char __user *)arg,
196 UDF_SB(inode->i_sb)->s_volume_ident, 32))
201 case UDF_RELOCATE_BLOCKS:
202 if (!capable(CAP_SYS_ADMIN)) {
206 if (get_user(old_block, (long __user *)arg)) {
210 result = udf_relocate_blocks(inode->i_sb,
211 old_block, &new_block);
213 result = put_user(new_block, (long __user *)arg);
216 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
219 result = copy_to_user((char __user *)arg,
220 UDF_I(inode)->i_ext.i_data,
221 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
229 static int udf_release_file(struct inode *inode, struct file *filp)
231 if (filp->f_mode & FMODE_WRITE) {
232 down_write(&UDF_I(inode)->i_data_sem);
233 udf_discard_prealloc(inode);
234 udf_truncate_tail_extent(inode);
235 up_write(&UDF_I(inode)->i_data_sem);
240 const struct file_operations udf_file_operations = {
241 .read = do_sync_read,
242 .aio_read = generic_file_aio_read,
243 .unlocked_ioctl = udf_ioctl,
244 .open = generic_file_open,
245 .mmap = generic_file_mmap,
246 .write = do_sync_write,
247 .aio_write = udf_file_aio_write,
248 .release = udf_release_file,
249 .fsync = generic_file_fsync,
250 .splice_read = generic_file_splice_read,
251 .llseek = generic_file_llseek,
254 static int udf_setattr(struct dentry *dentry, struct iattr *attr)
256 struct inode *inode = dentry->d_inode;
259 error = setattr_prepare(dentry, attr);
263 if ((attr->ia_valid & ATTR_SIZE) &&
264 attr->ia_size != i_size_read(inode)) {
265 error = udf_setsize(inode, attr->ia_size);
270 setattr_copy(inode, attr);
271 mark_inode_dirty(inode);
275 const struct inode_operations udf_file_inode_operations = {
276 .setattr = udf_setattr,