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/smp_lock.h>
36 #include <linux/pagemap.h>
37 #include <linux/quotaops.h>
38 #include <linux/buffer_head.h>
39 #include <linux/aio.h>
40 #include <linux/smp_lock.h>
45 static int udf_adinicb_readpage(struct file *file, struct page *page)
47 struct inode *inode = page->mapping->host;
49 struct udf_inode_info *iinfo = UDF_I(inode);
51 BUG_ON(!PageLocked(page));
54 memset(kaddr, 0, PAGE_CACHE_SIZE);
55 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
56 flush_dcache_page(page);
57 SetPageUptodate(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_end(struct file *file,
84 struct address_space *mapping,
85 loff_t pos, unsigned len, unsigned copied,
86 struct page *page, void *fsdata)
88 struct inode *inode = mapping->host;
89 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
91 struct udf_inode_info *iinfo = UDF_I(inode);
93 kaddr = kmap_atomic(page, KM_USER0);
94 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
95 kaddr + offset, copied);
96 kunmap_atomic(kaddr, KM_USER0);
98 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
101 const struct address_space_operations udf_adinicb_aops = {
102 .readpage = udf_adinicb_readpage,
103 .writepage = udf_adinicb_writepage,
104 .sync_page = block_sync_page,
105 .write_begin = simple_write_begin,
106 .write_end = udf_adinicb_write_end,
109 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
110 unsigned long nr_segs, loff_t ppos)
113 struct file *file = iocb->ki_filp;
114 struct inode *inode = file->f_path.dentry->d_inode;
116 size_t count = iocb->ki_left;
117 struct udf_inode_info *iinfo = UDF_I(inode);
119 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
120 if (file->f_flags & O_APPEND)
125 if (inode->i_sb->s_blocksize <
126 (udf_file_entry_alloc_offset(inode) +
128 udf_expand_file_adinicb(inode, pos + count, &err);
129 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
130 udf_debug("udf_expand_adinicb: err=%d\n", err);
134 if (pos + count > inode->i_size)
135 iinfo->i_lenAlloc = pos + count;
137 iinfo->i_lenAlloc = inode->i_size;
141 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
143 mark_inode_dirty(inode);
148 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
150 struct inode *inode = filp->f_dentry->d_inode;
151 long old_block, new_block;
152 int result = -EINVAL;
156 if (file_permission(filp, MAY_READ) != 0) {
157 udf_debug("no permission to access inode %lu\n", inode->i_ino);
163 udf_debug("invalid argument to udf_ioctl\n");
169 case UDF_GETVOLIDENT:
170 if (copy_to_user((char __user *)arg,
171 UDF_SB(inode->i_sb)->s_volume_ident, 32))
176 case UDF_RELOCATE_BLOCKS:
177 if (!capable(CAP_SYS_ADMIN)) {
181 if (get_user(old_block, (long __user *)arg)) {
185 result = udf_relocate_blocks(inode->i_sb,
186 old_block, &new_block);
188 result = put_user(new_block, (long __user *)arg);
191 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
194 result = copy_to_user((char __user *)arg,
195 UDF_I(inode)->i_ext.i_data,
196 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
205 static int udf_release_file(struct inode *inode, struct file *filp)
207 if (filp->f_mode & FMODE_WRITE) {
208 mutex_lock(&inode->i_mutex);
210 udf_discard_prealloc(inode);
211 udf_truncate_tail_extent(inode);
213 mutex_unlock(&inode->i_mutex);
218 const struct file_operations udf_file_operations = {
219 .read = do_sync_read,
220 .aio_read = generic_file_aio_read,
221 .unlocked_ioctl = udf_ioctl,
222 .open = dquot_file_open,
223 .mmap = generic_file_mmap,
224 .write = do_sync_write,
225 .aio_write = udf_file_aio_write,
226 .release = udf_release_file,
227 .fsync = simple_fsync,
228 .splice_read = generic_file_splice_read,
229 .llseek = generic_file_llseek,
232 int udf_setattr(struct dentry *dentry, struct iattr *iattr)
234 struct inode *inode = dentry->d_inode;
237 error = inode_change_ok(inode, iattr);
241 if (is_quota_modification(inode, iattr))
242 dquot_initialize(inode);
244 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
245 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
246 error = dquot_transfer(inode, iattr);
251 return inode_setattr(inode, iattr);
254 const struct inode_operations udf_file_inode_operations = {
255 .truncate = udf_truncate,
256 .setattr = udf_setattr,