IPVS: Change of socket usage to enable name space exit.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / file.c
blob2a346bb1d9f5f082338555fb50e754e19eb4aa67
1 /*
2 * file.c
4 * PURPOSE
5 * File handling routines for the OSTA-UDF(tm) filesystem.
7 * COPYRIGHT
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
17 * HISTORY
19 * 10/02/98 dgb Attempt to integrate into udf.o
20 * 10/07/98 Switched to using generic_readpage, etc., like isofs
21 * And it works!
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
28 #include "udfdecl.h"
29 #include <linux/fs.h>
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>
39 #include "udf_i.h"
40 #include "udf_sb.h"
42 static int udf_adinicb_readpage(struct file *file, struct page *page)
44 struct inode *inode = page->mapping->host;
45 char *kaddr;
46 struct udf_inode_info *iinfo = UDF_I(inode);
48 BUG_ON(!PageLocked(page));
50 kaddr = kmap(page);
51 memset(kaddr, 0, PAGE_CACHE_SIZE);
52 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
53 flush_dcache_page(page);
54 SetPageUptodate(page);
55 kunmap(page);
56 unlock_page(page);
58 return 0;
61 static int udf_adinicb_writepage(struct page *page,
62 struct writeback_control *wbc)
64 struct inode *inode = page->mapping->host;
65 char *kaddr;
66 struct udf_inode_info *iinfo = UDF_I(inode);
68 BUG_ON(!PageLocked(page));
70 kaddr = kmap(page);
71 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
72 mark_inode_dirty(inode);
73 SetPageUptodate(page);
74 kunmap(page);
75 unlock_page(page);
77 return 0;
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);
87 char *kaddr;
88 struct udf_inode_info *iinfo = UDF_I(inode);
90 kaddr = kmap_atomic(page, KM_USER0);
91 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
92 kaddr + offset, copied);
93 kunmap_atomic(kaddr, KM_USER0);
95 return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
98 const struct address_space_operations udf_adinicb_aops = {
99 .readpage = udf_adinicb_readpage,
100 .writepage = udf_adinicb_writepage,
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)
108 ssize_t retval;
109 struct file *file = iocb->ki_filp;
110 struct inode *inode = file->f_path.dentry->d_inode;
111 int err, pos;
112 size_t count = iocb->ki_left;
113 struct udf_inode_info *iinfo = UDF_I(inode);
115 down_write(&iinfo->i_data_sem);
116 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
117 if (file->f_flags & O_APPEND)
118 pos = inode->i_size;
119 else
120 pos = ppos;
122 if (inode->i_sb->s_blocksize <
123 (udf_file_entry_alloc_offset(inode) +
124 pos + count)) {
125 err = udf_expand_file_adinicb(inode);
126 if (err) {
127 udf_debug("udf_expand_adinicb: err=%d\n", err);
128 up_write(&iinfo->i_data_sem);
129 return err;
131 } else {
132 if (pos + count > inode->i_size)
133 iinfo->i_lenAlloc = pos + count;
134 else
135 iinfo->i_lenAlloc = inode->i_size;
138 up_write(&iinfo->i_data_sem);
140 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
141 if (retval > 0)
142 mark_inode_dirty(inode);
144 return retval;
147 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
149 struct inode *inode = filp->f_dentry->d_inode;
150 long old_block, new_block;
151 int result = -EINVAL;
153 if (file_permission(filp, MAY_READ) != 0) {
154 udf_debug("no permission to access inode %lu\n", inode->i_ino);
155 result = -EPERM;
156 goto out;
159 if (!arg) {
160 udf_debug("invalid argument to udf_ioctl\n");
161 result = -EINVAL;
162 goto out;
165 switch (cmd) {
166 case UDF_GETVOLIDENT:
167 if (copy_to_user((char __user *)arg,
168 UDF_SB(inode->i_sb)->s_volume_ident, 32))
169 result = -EFAULT;
170 else
171 result = 0;
172 goto out;
173 case UDF_RELOCATE_BLOCKS:
174 if (!capable(CAP_SYS_ADMIN)) {
175 result = -EACCES;
176 goto out;
178 if (get_user(old_block, (long __user *)arg)) {
179 result = -EFAULT;
180 goto out;
182 result = udf_relocate_blocks(inode->i_sb,
183 old_block, &new_block);
184 if (result == 0)
185 result = put_user(new_block, (long __user *)arg);
186 goto out;
187 case UDF_GETEASIZE:
188 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
189 goto out;
190 case UDF_GETEABLOCK:
191 result = copy_to_user((char __user *)arg,
192 UDF_I(inode)->i_ext.i_data,
193 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
194 goto out;
197 out:
198 return result;
201 static int udf_release_file(struct inode *inode, struct file *filp)
203 if (filp->f_mode & FMODE_WRITE) {
204 mutex_lock(&inode->i_mutex);
205 down_write(&UDF_I(inode)->i_data_sem);
206 udf_discard_prealloc(inode);
207 udf_truncate_tail_extent(inode);
208 up_write(&UDF_I(inode)->i_data_sem);
209 mutex_unlock(&inode->i_mutex);
211 return 0;
214 const struct file_operations udf_file_operations = {
215 .read = do_sync_read,
216 .aio_read = generic_file_aio_read,
217 .unlocked_ioctl = udf_ioctl,
218 .open = generic_file_open,
219 .mmap = generic_file_mmap,
220 .write = do_sync_write,
221 .aio_write = udf_file_aio_write,
222 .release = udf_release_file,
223 .fsync = generic_file_fsync,
224 .splice_read = generic_file_splice_read,
225 .llseek = generic_file_llseek,
228 static int udf_setattr(struct dentry *dentry, struct iattr *attr)
230 struct inode *inode = dentry->d_inode;
231 int error;
233 error = inode_change_ok(inode, attr);
234 if (error)
235 return error;
237 if ((attr->ia_valid & ATTR_SIZE) &&
238 attr->ia_size != i_size_read(inode)) {
239 error = udf_setsize(inode, attr->ia_size);
240 if (error)
241 return error;
244 setattr_copy(inode, attr);
245 mark_inode_dirty(inode);
246 return 0;
249 const struct inode_operations udf_file_inode_operations = {
250 .setattr = udf_setattr,