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_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
54 flush_dcache_page(page);
55 SetPageUptodate(page);
62 static int udf_adinicb_writepage(struct page *page,
63 struct writeback_control *wbc)
65 struct inode *inode = page->mapping->host;
68 BUG_ON(!PageLocked(page));
71 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
72 mark_inode_dirty(inode);
73 SetPageUptodate(page);
80 static int udf_adinicb_write_end(struct file *file,
81 struct address_space *mapping,
82 loff_t pos, unsigned len, unsigned copied,
83 struct page *page, void *fsdata)
85 struct inode *inode = mapping->host;
86 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
89 kaddr = kmap_atomic(page, KM_USER0);
90 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
91 kaddr + offset, copied);
92 kunmap_atomic(kaddr, KM_USER0);
94 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
97 const struct address_space_operations udf_adinicb_aops = {
98 .readpage = udf_adinicb_readpage,
99 .writepage = udf_adinicb_writepage,
100 .sync_page = block_sync_page,
101 .write_begin = simple_write_begin,
102 .write_end = udf_adinicb_write_end,
105 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
106 unsigned long nr_segs, loff_t ppos)
109 struct file *file = iocb->ki_filp;
110 struct inode *inode = file->f_path.dentry->d_inode;
112 size_t count = iocb->ki_left;
114 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
115 if (file->f_flags & O_APPEND)
120 if (inode->i_sb->s_blocksize <
121 (udf_file_entry_alloc_offset(inode) +
123 udf_expand_file_adinicb(inode, pos + count, &err);
124 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
125 udf_debug("udf_expand_adinicb: err=%d\n", err);
129 if (pos + count > inode->i_size)
130 UDF_I_LENALLOC(inode) = pos + count;
132 UDF_I_LENALLOC(inode) = inode->i_size;
136 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
138 mark_inode_dirty(inode);
150 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
151 * available, and the ioctl cannot be handled without filesystem help.
153 * sys_ioctl() handles these ioctls that apply only to regular files:
154 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
155 * These ioctls are also handled by sys_ioctl():
156 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
157 * All other ioctls are passed to the filesystem.
159 * Refer to sys_ioctl() in fs/ioctl.c
163 * inode Pointer to inode that ioctl was issued on.
164 * filp Pointer to file that ioctl was issued on.
165 * cmd The ioctl command.
166 * arg The ioctl argument [can be interpreted as a
167 * user-space pointer if desired].
170 * <return> Success (>=0) or an error code (<=0) that
171 * sys_ioctl() will return.
174 * July 1, 1997 - Andrew E. Mileski
175 * Written, tested, and released.
177 int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
180 long old_block, new_block;
181 int result = -EINVAL;
183 if (file_permission(filp, MAY_READ) != 0) {
184 udf_debug("no permission to access inode %lu\n",
190 udf_debug("invalid argument to udf_ioctl\n");
195 case UDF_GETVOLIDENT:
196 if (copy_to_user((char __user *)arg,
197 UDF_SB(inode->i_sb)->s_volume_ident, 32))
201 case UDF_RELOCATE_BLOCKS:
202 if (!capable(CAP_SYS_ADMIN))
204 if (get_user(old_block, (long __user *)arg))
206 result = udf_relocate_blocks(inode->i_sb,
207 old_block, &new_block);
209 result = put_user(new_block, (long __user *)arg);
212 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
215 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
216 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
227 * Called when all references to the file are closed
230 * Discard prealloced blocks
235 static int udf_release_file(struct inode *inode, struct file *filp)
237 if (filp->f_mode & FMODE_WRITE) {
239 udf_discard_prealloc(inode);
245 const struct file_operations udf_file_operations = {
246 .read = do_sync_read,
247 .aio_read = generic_file_aio_read,
249 .open = generic_file_open,
250 .mmap = generic_file_mmap,
251 .write = do_sync_write,
252 .aio_write = udf_file_aio_write,
253 .release = udf_release_file,
254 .fsync = udf_fsync_file,
255 .splice_read = generic_file_splice_read,
258 const struct inode_operations udf_file_inode_operations = {
259 .truncate = udf_truncate,