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/uio.h>
41 static void __udf_adinicb_readpage(struct page *page)
43 struct inode *inode = page->mapping->host;
45 struct udf_inode_info *iinfo = UDF_I(inode);
48 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
49 memset(kaddr + inode->i_size, 0, PAGE_SIZE - inode->i_size);
50 flush_dcache_page(page);
51 SetPageUptodate(page);
55 static int udf_adinicb_readpage(struct file *file, struct page *page)
57 BUG_ON(!PageLocked(page));
58 __udf_adinicb_readpage(page);
64 static int udf_adinicb_writepage(struct page *page,
65 struct writeback_control *wbc)
67 struct inode *inode = page->mapping->host;
69 struct udf_inode_info *iinfo = UDF_I(inode);
71 BUG_ON(!PageLocked(page));
74 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
75 mark_inode_dirty(inode);
76 SetPageUptodate(page);
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,
90 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
92 page = grab_cache_page_write_begin(mapping, 0, flags);
97 if (!PageUptodate(page) && len != PAGE_SIZE)
98 __udf_adinicb_readpage(page);
102 static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
104 /* Fallback to buffered I/O. */
108 const struct address_space_operations udf_adinicb_aops = {
109 .readpage = udf_adinicb_readpage,
110 .writepage = udf_adinicb_writepage,
111 .write_begin = udf_adinicb_write_begin,
112 .write_end = simple_write_end,
113 .direct_IO = udf_adinicb_direct_IO,
116 static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
119 struct file *file = iocb->ki_filp;
120 struct inode *inode = file_inode(file);
121 struct udf_inode_info *iinfo = UDF_I(inode);
126 retval = generic_write_checks(iocb, from);
130 down_write(&iinfo->i_data_sem);
131 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
132 loff_t end = iocb->ki_pos + iov_iter_count(from);
134 if (inode->i_sb->s_blocksize <
135 (udf_file_entry_alloc_offset(inode) + end)) {
136 err = udf_expand_file_adinicb(inode);
139 udf_debug("udf_expand_adinicb: err=%d\n", err);
143 iinfo->i_lenAlloc = max(end, inode->i_size);
144 up_write(&iinfo->i_data_sem);
147 up_write(&iinfo->i_data_sem);
149 retval = __generic_file_write_iter(iocb, from);
154 mark_inode_dirty(inode);
155 retval = generic_write_sync(iocb, retval);
161 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
163 struct inode *inode = file_inode(filp);
164 long old_block, new_block;
165 int result = -EINVAL;
167 if (inode_permission(inode, MAY_READ) != 0) {
168 udf_debug("no permission to access inode %lu\n", inode->i_ino);
174 udf_debug("invalid argument to udf_ioctl\n");
180 case UDF_GETVOLIDENT:
181 if (copy_to_user((char __user *)arg,
182 UDF_SB(inode->i_sb)->s_volume_ident, 32))
187 case UDF_RELOCATE_BLOCKS:
188 if (!capable(CAP_SYS_ADMIN)) {
192 if (get_user(old_block, (long __user *)arg)) {
196 result = udf_relocate_blocks(inode->i_sb,
197 old_block, &new_block);
199 result = put_user(new_block, (long __user *)arg);
202 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
205 result = copy_to_user((char __user *)arg,
206 UDF_I(inode)->i_ext.i_data,
207 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
215 static int udf_release_file(struct inode *inode, struct file *filp)
217 if (filp->f_mode & FMODE_WRITE &&
218 atomic_read(&inode->i_writecount) == 1) {
220 * Grab i_mutex to avoid races with writes changing i_size
221 * while we are running.
224 down_write(&UDF_I(inode)->i_data_sem);
225 udf_discard_prealloc(inode);
226 udf_truncate_tail_extent(inode);
227 up_write(&UDF_I(inode)->i_data_sem);
233 const struct file_operations udf_file_operations = {
234 .read_iter = generic_file_read_iter,
235 .unlocked_ioctl = udf_ioctl,
236 .open = generic_file_open,
237 .mmap = generic_file_mmap,
238 .write_iter = udf_file_write_iter,
239 .release = udf_release_file,
240 .fsync = generic_file_fsync,
241 .splice_read = generic_file_splice_read,
242 .llseek = generic_file_llseek,
245 static int udf_setattr(struct dentry *dentry, struct iattr *attr)
247 struct inode *inode = d_inode(dentry);
250 error = inode_change_ok(inode, attr);
254 if ((attr->ia_valid & ATTR_SIZE) &&
255 attr->ia_size != i_size_read(inode)) {
256 error = udf_setsize(inode, attr->ia_size);
261 setattr_copy(inode, attr);
262 mark_inode_dirty(inode);
266 const struct inode_operations udf_file_inode_operations = {
267 .setattr = udf_setattr,