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 <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> 40 41 #include "udf_i.h" 42 #include "udf_sb.h" 43 44 static int udf_adinicb_readpage(struct file *file, struct page *page) 45 { 46 struct inode *inode = page->mapping->host; 47 char *kaddr; 48 struct udf_inode_info *iinfo = UDF_I(inode); 49 50 BUG_ON(!PageLocked(page)); 51 52 kaddr = kmap(page); 53 memset(kaddr, 0, PAGE_CACHE_SIZE); 54 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size); 55 flush_dcache_page(page); 56 SetPageUptodate(page); 57 kunmap(page); 58 unlock_page(page); 59 60 return 0; 61 } 62 63 static int udf_adinicb_writepage(struct page *page, 64 struct writeback_control *wbc) 65 { 66 struct inode *inode = page->mapping->host; 67 char *kaddr; 68 struct udf_inode_info *iinfo = UDF_I(inode); 69 70 BUG_ON(!PageLocked(page)); 71 72 kaddr = kmap(page); 73 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size); 74 mark_inode_dirty(inode); 75 SetPageUptodate(page); 76 kunmap(page); 77 unlock_page(page); 78 79 return 0; 80 } 81 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) 86 { 87 struct inode *inode = mapping->host; 88 unsigned offset = pos & (PAGE_CACHE_SIZE - 1); 89 char *kaddr; 90 struct udf_inode_info *iinfo = UDF_I(inode); 91 92 kaddr = kmap_atomic(page, KM_USER0); 93 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset, 94 kaddr + offset, copied); 95 kunmap_atomic(kaddr, KM_USER0); 96 97 return simple_write_end(file, mapping, pos, len, copied, page, fsdata); 98 } 99 100 const struct address_space_operations udf_adinicb_aops = { 101 .readpage = udf_adinicb_readpage, 102 .writepage = udf_adinicb_writepage, 103 .sync_page = block_sync_page, 104 .write_begin = simple_write_begin, 105 .write_end = udf_adinicb_write_end, 106 }; 107 108 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, 109 unsigned long nr_segs, loff_t ppos) 110 { 111 ssize_t retval; 112 struct file *file = iocb->ki_filp; 113 struct inode *inode = file->f_path.dentry->d_inode; 114 int err, pos; 115 size_t count = iocb->ki_left; 116 struct udf_inode_info *iinfo = UDF_I(inode); 117 118 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 119 if (file->f_flags & O_APPEND) 120 pos = inode->i_size; 121 else 122 pos = ppos; 123 124 if (inode->i_sb->s_blocksize < 125 (udf_file_entry_alloc_offset(inode) + 126 pos + count)) { 127 udf_expand_file_adinicb(inode, pos + count, &err); 128 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 129 udf_debug("udf_expand_adinicb: err=%d\n", err); 130 return err; 131 } 132 } else { 133 if (pos + count > inode->i_size) 134 iinfo->i_lenAlloc = pos + count; 135 else 136 iinfo->i_lenAlloc = inode->i_size; 137 } 138 } 139 140 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); 141 if (retval > 0) 142 mark_inode_dirty(inode); 143 144 return retval; 145 } 146 147 /* 148 * udf_ioctl 149 * 150 * PURPOSE 151 * Issue an ioctl. 152 * 153 * DESCRIPTION 154 * Optional - sys_ioctl() will return -ENOTTY if this routine is not 155 * available, and the ioctl cannot be handled without filesystem help. 156 * 157 * sys_ioctl() handles these ioctls that apply only to regular files: 158 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD 159 * These ioctls are also handled by sys_ioctl(): 160 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC 161 * All other ioctls are passed to the filesystem. 162 * 163 * Refer to sys_ioctl() in fs/ioctl.c 164 * sys_ioctl() -> . 165 * 166 * PRE-CONDITIONS 167 * inode Pointer to inode that ioctl was issued on. 168 * filp Pointer to file that ioctl was issued on. 169 * cmd The ioctl command. 170 * arg The ioctl argument [can be interpreted as a 171 * user-space pointer if desired]. 172 * 173 * POST-CONDITIONS 174 * <return> Success (>=0) or an error code (<=0) that 175 * sys_ioctl() will return. 176 * 177 * HISTORY 178 * July 1, 1997 - Andrew E. Mileski 179 * Written, tested, and released. 180 */ 181 int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, 182 unsigned long arg) 183 { 184 long old_block, new_block; 185 int result = -EINVAL; 186 187 if (file_permission(filp, MAY_READ) != 0) { 188 udf_debug("no permission to access inode %lu\n", 189 inode->i_ino); 190 return -EPERM; 191 } 192 193 if (!arg) { 194 udf_debug("invalid argument to udf_ioctl\n"); 195 return -EINVAL; 196 } 197 198 switch (cmd) { 199 case UDF_GETVOLIDENT: 200 if (copy_to_user((char __user *)arg, 201 UDF_SB(inode->i_sb)->s_volume_ident, 32)) 202 return -EFAULT; 203 else 204 return 0; 205 case UDF_RELOCATE_BLOCKS: 206 if (!capable(CAP_SYS_ADMIN)) 207 return -EACCES; 208 if (get_user(old_block, (long __user *)arg)) 209 return -EFAULT; 210 result = udf_relocate_blocks(inode->i_sb, 211 old_block, &new_block); 212 if (result == 0) 213 result = put_user(new_block, (long __user *)arg); 214 return result; 215 case UDF_GETEASIZE: 216 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); 217 break; 218 case UDF_GETEABLOCK: 219 result = copy_to_user((char __user *)arg, 220 UDF_I(inode)->i_ext.i_data, 221 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; 222 break; 223 } 224 225 return result; 226 } 227 228 /* 229 * udf_release_file 230 * 231 * PURPOSE 232 * Called when all references to the file are closed 233 * 234 * DESCRIPTION 235 * Discard prealloced blocks 236 * 237 * HISTORY 238 * 239 */ 240 static int udf_release_file(struct inode *inode, struct file *filp) 241 { 242 if (filp->f_mode & FMODE_WRITE) { 243 lock_kernel(); 244 udf_discard_prealloc(inode); 245 unlock_kernel(); 246 } 247 return 0; 248 } 249 250 const struct file_operations udf_file_operations = { 251 .read = do_sync_read, 252 .aio_read = generic_file_aio_read, 253 .ioctl = udf_ioctl, 254 .open = generic_file_open, 255 .mmap = generic_file_mmap, 256 .write = do_sync_write, 257 .aio_write = udf_file_aio_write, 258 .release = udf_release_file, 259 .fsync = udf_fsync_file, 260 .splice_read = generic_file_splice_read, 261 }; 262 263 const struct inode_operations udf_file_inode_operations = { 264 .truncate = udf_truncate, 265 }; 266