1 /* 2 * file.c 3 * 4 * PURPOSE 5 * File handling routines for the OSTA-UDF(tm) filesystem. 6 * 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. 12 * 13 * (C) 1998-1999 Dave Boynton 14 * (C) 1998-2004 Ben Fennema 15 * (C) 1999-2000 Stelias Computing Inc 16 * 17 * HISTORY 18 * 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 26 */ 27 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/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> 41 42 #include "udf_i.h" 43 #include "udf_sb.h" 44 45 static int udf_adinicb_readpage(struct file *file, struct page *page) 46 { 47 struct inode *inode = page->mapping->host; 48 char *kaddr; 49 struct udf_inode_info *iinfo = UDF_I(inode); 50 51 BUG_ON(!PageLocked(page)); 52 53 kaddr = kmap(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); 58 kunmap(page); 59 unlock_page(page); 60 61 return 0; 62 } 63 64 static int udf_adinicb_writepage(struct page *page, 65 struct writeback_control *wbc) 66 { 67 struct inode *inode = page->mapping->host; 68 char *kaddr; 69 struct udf_inode_info *iinfo = UDF_I(inode); 70 71 BUG_ON(!PageLocked(page)); 72 73 kaddr = kmap(page); 74 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); 75 mark_inode_dirty(inode); 76 SetPageUptodate(page); 77 kunmap(page); 78 unlock_page(page); 79 80 return 0; 81 } 82 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) 87 { 88 struct inode *inode = mapping->host; 89 unsigned offset = pos & (PAGE_CACHE_SIZE - 1); 90 char *kaddr; 91 struct udf_inode_info *iinfo = UDF_I(inode); 92 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); 97 98 return simple_write_end(file, mapping, pos, len, copied, page, fsdata); 99 } 100 101 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, 107 }; 108 109 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, 110 unsigned long nr_segs, loff_t ppos) 111 { 112 ssize_t retval; 113 struct file *file = iocb->ki_filp; 114 struct inode *inode = file->f_path.dentry->d_inode; 115 int err, pos; 116 size_t count = iocb->ki_left; 117 struct udf_inode_info *iinfo = UDF_I(inode); 118 119 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 120 if (file->f_flags & O_APPEND) 121 pos = inode->i_size; 122 else 123 pos = ppos; 124 125 if (inode->i_sb->s_blocksize < 126 (udf_file_entry_alloc_offset(inode) + 127 pos + count)) { 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); 131 return err; 132 } 133 } else { 134 if (pos + count > inode->i_size) 135 iinfo->i_lenAlloc = pos + count; 136 else 137 iinfo->i_lenAlloc = inode->i_size; 138 } 139 } 140 141 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); 142 if (retval > 0) 143 mark_inode_dirty(inode); 144 145 return retval; 146 } 147 148 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 149 { 150 struct inode *inode = filp->f_dentry->d_inode; 151 long old_block, new_block; 152 int result = -EINVAL; 153 154 lock_kernel(); 155 156 if (file_permission(filp, MAY_READ) != 0) { 157 udf_debug("no permission to access inode %lu\n", inode->i_ino); 158 result = -EPERM; 159 goto out; 160 } 161 162 if (!arg) { 163 udf_debug("invalid argument to udf_ioctl\n"); 164 result = -EINVAL; 165 goto out; 166 } 167 168 switch (cmd) { 169 case UDF_GETVOLIDENT: 170 if (copy_to_user((char __user *)arg, 171 UDF_SB(inode->i_sb)->s_volume_ident, 32)) 172 result = -EFAULT; 173 else 174 result = 0; 175 goto out; 176 case UDF_RELOCATE_BLOCKS: 177 if (!capable(CAP_SYS_ADMIN)) { 178 result = -EACCES; 179 goto out; 180 } 181 if (get_user(old_block, (long __user *)arg)) { 182 result = -EFAULT; 183 goto out; 184 } 185 result = udf_relocate_blocks(inode->i_sb, 186 old_block, &new_block); 187 if (result == 0) 188 result = put_user(new_block, (long __user *)arg); 189 goto out; 190 case UDF_GETEASIZE: 191 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); 192 goto out; 193 case UDF_GETEABLOCK: 194 result = copy_to_user((char __user *)arg, 195 UDF_I(inode)->i_ext.i_data, 196 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; 197 goto out; 198 } 199 200 out: 201 unlock_kernel(); 202 return result; 203 } 204 205 static int udf_release_file(struct inode *inode, struct file *filp) 206 { 207 if (filp->f_mode & FMODE_WRITE) { 208 mutex_lock(&inode->i_mutex); 209 lock_kernel(); 210 udf_discard_prealloc(inode); 211 udf_truncate_tail_extent(inode); 212 unlock_kernel(); 213 mutex_unlock(&inode->i_mutex); 214 } 215 return 0; 216 } 217 218 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, 230 }; 231 232 int udf_setattr(struct dentry *dentry, struct iattr *iattr) 233 { 234 struct inode *inode = dentry->d_inode; 235 int error; 236 237 error = inode_change_ok(inode, iattr); 238 if (error) 239 return error; 240 241 if (is_quota_modification(inode, iattr)) 242 dquot_initialize(inode); 243 244 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); 247 if (error) 248 return error; 249 } 250 251 return inode_setattr(inode, iattr); 252 } 253 254 const struct inode_operations udf_file_inode_operations = { 255 .truncate = udf_truncate, 256 .setattr = udf_setattr, 257 }; 258