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 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 int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, 148 unsigned long arg) 149 { 150 long old_block, new_block; 151 int result = -EINVAL; 152 153 if (file_permission(filp, MAY_READ) != 0) { 154 udf_debug("no permission to access inode %lu\n", 155 inode->i_ino); 156 return -EPERM; 157 } 158 159 if (!arg) { 160 udf_debug("invalid argument to udf_ioctl\n"); 161 return -EINVAL; 162 } 163 164 switch (cmd) { 165 case UDF_GETVOLIDENT: 166 if (copy_to_user((char __user *)arg, 167 UDF_SB(inode->i_sb)->s_volume_ident, 32)) 168 return -EFAULT; 169 else 170 return 0; 171 case UDF_RELOCATE_BLOCKS: 172 if (!capable(CAP_SYS_ADMIN)) 173 return -EACCES; 174 if (get_user(old_block, (long __user *)arg)) 175 return -EFAULT; 176 result = udf_relocate_blocks(inode->i_sb, 177 old_block, &new_block); 178 if (result == 0) 179 result = put_user(new_block, (long __user *)arg); 180 return result; 181 case UDF_GETEASIZE: 182 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg); 183 break; 184 case UDF_GETEABLOCK: 185 result = copy_to_user((char __user *)arg, 186 UDF_I(inode)->i_ext.i_data, 187 UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0; 188 break; 189 } 190 191 return result; 192 } 193 194 static int udf_release_file(struct inode *inode, struct file *filp) 195 { 196 if (filp->f_mode & FMODE_WRITE) { 197 mutex_lock(&inode->i_mutex); 198 lock_kernel(); 199 udf_discard_prealloc(inode); 200 udf_truncate_tail_extent(inode); 201 unlock_kernel(); 202 mutex_unlock(&inode->i_mutex); 203 } 204 return 0; 205 } 206 207 const struct file_operations udf_file_operations = { 208 .read = do_sync_read, 209 .aio_read = generic_file_aio_read, 210 .ioctl = udf_ioctl, 211 .open = dquot_file_open, 212 .mmap = generic_file_mmap, 213 .write = do_sync_write, 214 .aio_write = udf_file_aio_write, 215 .release = udf_release_file, 216 .fsync = simple_fsync, 217 .splice_read = generic_file_splice_read, 218 .llseek = generic_file_llseek, 219 }; 220 221 int udf_setattr(struct dentry *dentry, struct iattr *iattr) 222 { 223 struct inode *inode = dentry->d_inode; 224 int error; 225 226 error = inode_change_ok(inode, iattr); 227 if (error) 228 return error; 229 230 if (iattr->ia_valid & ATTR_SIZE) 231 dquot_initialize(inode); 232 233 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || 234 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { 235 error = dquot_transfer(inode, iattr); 236 if (error) 237 return error; 238 } 239 240 return inode_setattr(inode, iattr); 241 } 242 243 const struct inode_operations udf_file_inode_operations = { 244 .truncate = udf_truncate, 245 .setattr = udf_setattr, 246 }; 247