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/udf_fs.h>
31 #include <asm/uaccess.h>
32 #include <linux/kernel.h>
33 #include <linux/string.h> /* memset */
34 #include <linux/capability.h>
35 #include <linux/errno.h>
36 #include <linux/smp_lock.h>
37 #include <linux/pagemap.h>
38 #include <linux/buffer_head.h>
39 #include <linux/aio.h>
44 static int udf_adinicb_readpage(struct file *file, struct page *page)
46 struct inode *inode = page->mapping->host;
49 BUG_ON(!PageLocked(page));
52 memset(kaddr, 0, PAGE_CACHE_SIZE);
53 memcpy(kaddr, UDF_I(inode)->i_ext.i_data + UDF_I(inode)->i_lenEAttr,
55 flush_dcache_page(page);
56 SetPageUptodate(page);
63 static int udf_adinicb_writepage(struct page *page,
64 struct writeback_control *wbc)
66 struct inode *inode = page->mapping->host;
69 BUG_ON(!PageLocked(page));
72 memcpy(UDF_I(inode)->i_ext.i_data + UDF_I(inode)->i_lenEAttr, kaddr,
74 mark_inode_dirty(inode);
75 SetPageUptodate(page);
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)
87 struct inode *inode = mapping->host;
88 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
91 kaddr = kmap_atomic(page, KM_USER0);
92 memcpy(UDF_I(inode)->i_ext.i_data + UDF_I(inode)->i_lenEAttr + offset,
93 kaddr + offset, copied);
94 kunmap_atomic(kaddr, KM_USER0);
96 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
99 const struct address_space_operations udf_adinicb_aops = {
100 .readpage = udf_adinicb_readpage,
101 .writepage = udf_adinicb_writepage,
102 .sync_page = block_sync_page,
103 .write_begin = simple_write_begin,
104 .write_end = udf_adinicb_write_end,
107 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
108 unsigned long nr_segs, loff_t ppos)
111 struct file *file = iocb->ki_filp;
112 struct inode *inode = file->f_path.dentry->d_inode;
114 size_t count = iocb->ki_left;
116 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
117 if (file->f_flags & O_APPEND)
122 if (inode->i_sb->s_blocksize <
123 (udf_file_entry_alloc_offset(inode) +
125 udf_expand_file_adinicb(inode, pos + count, &err);
126 if (UDF_I(inode)->i_alloc_type ==
127 ICBTAG_FLAG_AD_IN_ICB) {
128 udf_debug("udf_expand_adinicb: err=%d\n", err);
132 if (pos + count > inode->i_size)
133 UDF_I(inode)->i_lenAlloc = pos + count;
135 UDF_I(inode)->i_lenAlloc = inode->i_size;
139 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
141 mark_inode_dirty(inode);
153 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
154 * available, and the ioctl cannot be handled without filesystem help.
156 * sys_ioctl() handles these ioctls that apply only to regular files:
157 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
158 * These ioctls are also handled by sys_ioctl():
159 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
160 * All other ioctls are passed to the filesystem.
162 * Refer to sys_ioctl() in fs/ioctl.c
166 * inode Pointer to inode that ioctl was issued on.
167 * filp Pointer to file that ioctl was issued on.
168 * cmd The ioctl command.
169 * arg The ioctl argument [can be interpreted as a
170 * user-space pointer if desired].
173 * <return> Success (>=0) or an error code (<=0) that
174 * sys_ioctl() will return.
177 * July 1, 1997 - Andrew E. Mileski
178 * Written, tested, and released.
180 int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
183 long old_block, new_block;
184 int result = -EINVAL;
186 if (file_permission(filp, MAY_READ) != 0) {
187 udf_debug("no permission to access inode %lu\n",
193 udf_debug("invalid argument to udf_ioctl\n");
198 case UDF_GETVOLIDENT:
199 if (copy_to_user((char __user *)arg,
200 UDF_SB(inode->i_sb)->s_volume_ident, 32))
204 case UDF_RELOCATE_BLOCKS:
205 if (!capable(CAP_SYS_ADMIN))
207 if (get_user(old_block, (long __user *)arg))
209 result = udf_relocate_blocks(inode->i_sb,
210 old_block, &new_block);
212 result = put_user(new_block, (long __user *)arg);
215 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
218 result = copy_to_user((char __user *)arg,
219 UDF_I(inode)->i_ext.i_data,
220 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
231 * Called when all references to the file are closed
234 * Discard prealloced blocks
239 static int udf_release_file(struct inode *inode, struct file *filp)
241 if (filp->f_mode & FMODE_WRITE) {
243 udf_discard_prealloc(inode);
249 const struct file_operations udf_file_operations = {
250 .read = do_sync_read,
251 .aio_read = generic_file_aio_read,
253 .open = generic_file_open,
254 .mmap = generic_file_mmap,
255 .write = do_sync_write,
256 .aio_write = udf_file_aio_write,
257 .release = udf_release_file,
258 .fsync = udf_fsync_file,
259 .splice_read = generic_file_splice_read,
262 const struct inode_operations udf_file_inode_operations = {
263 .truncate = udf_truncate,