Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * file.c |
| 3 | * |
| 4 | * PURPOSE |
| 5 | * File handling routines for the OSTA-UDF(tm) filesystem. |
| 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 33 | #include <linux/string.h> /* memset */ |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 34 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/errno.h> |
| 36 | #include <linux/smp_lock.h> |
| 37 | #include <linux/pagemap.h> |
| 38 | #include <linux/buffer_head.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 39 | #include <linux/aio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #include "udf_i.h" |
| 42 | #include "udf_sb.h" |
| 43 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 44 | static int udf_adinicb_readpage(struct file *file, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
| 46 | struct inode *inode = page->mapping->host; |
| 47 | char *kaddr; |
| 48 | |
Matt Mackall | cd7619d | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 49 | BUG_ON(!PageLocked(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | kaddr = kmap(page); |
| 52 | memset(kaddr, 0, PAGE_CACHE_SIZE); |
| 53 | memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size); |
| 54 | flush_dcache_page(page); |
| 55 | SetPageUptodate(page); |
| 56 | kunmap(page); |
| 57 | unlock_page(page); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | return 0; |
| 60 | } |
| 61 | |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 62 | static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
| 64 | struct inode *inode = page->mapping->host; |
| 65 | char *kaddr; |
| 66 | |
Matt Mackall | cd7619d | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 67 | BUG_ON(!PageLocked(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | kaddr = kmap(page); |
| 70 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size); |
| 71 | mark_inode_dirty(inode); |
| 72 | SetPageUptodate(page); |
| 73 | kunmap(page); |
| 74 | unlock_page(page); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return 0; |
| 77 | } |
| 78 | |
Nick Piggin | be021ee | 2007-10-16 01:25:20 -0700 | [diff] [blame] | 79 | static int udf_adinicb_write_end(struct file *file, |
| 80 | struct address_space *mapping, |
| 81 | loff_t pos, unsigned len, unsigned copied, |
| 82 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Nick Piggin | be021ee | 2007-10-16 01:25:20 -0700 | [diff] [blame] | 84 | struct inode *inode = mapping->host; |
| 85 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 86 | char *kaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Nick Piggin | be021ee | 2007-10-16 01:25:20 -0700 | [diff] [blame] | 88 | kaddr = kmap_atomic(page, KM_USER0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, |
Nick Piggin | be021ee | 2007-10-16 01:25:20 -0700 | [diff] [blame] | 90 | kaddr + offset, copied); |
| 91 | kunmap_atomic(kaddr, KM_USER0); |
| 92 | |
| 93 | return simple_write_end(file, mapping, pos, len, copied, page, fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 96 | const struct address_space_operations udf_adinicb_aops = { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 97 | .readpage = udf_adinicb_readpage, |
| 98 | .writepage = udf_adinicb_writepage, |
| 99 | .sync_page = block_sync_page, |
Nick Piggin | be021ee | 2007-10-16 01:25:20 -0700 | [diff] [blame] | 100 | .write_begin = simple_write_begin, |
| 101 | .write_end = udf_adinicb_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | }; |
| 103 | |
Badari Pulavarty | 543ade1 | 2006-09-30 23:28:48 -0700 | [diff] [blame] | 104 | static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 105 | unsigned long nr_segs, loff_t ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
| 107 | ssize_t retval; |
Badari Pulavarty | 543ade1 | 2006-09-30 23:28:48 -0700 | [diff] [blame] | 108 | struct file *file = iocb->ki_filp; |
Josef Sipek | 5096e93 | 2006-12-08 02:37:44 -0800 | [diff] [blame] | 109 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | int err, pos; |
Badari Pulavarty | 543ade1 | 2006-09-30 23:28:48 -0700 | [diff] [blame] | 111 | size_t count = iocb->ki_left; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 113 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | if (file->f_flags & O_APPEND) |
| 115 | pos = inode->i_size; |
| 116 | else |
Badari Pulavarty | 543ade1 | 2006-09-30 23:28:48 -0700 | [diff] [blame] | 117 | pos = ppos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 119 | if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) + |
| 120 | pos + count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | udf_expand_file_adinicb(inode, pos + count, &err); |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 122 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
| 124 | return err; |
| 125 | } |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 126 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | if (pos + count > inode->i_size) |
| 128 | UDF_I_LENALLOC(inode) = pos + count; |
| 129 | else |
| 130 | UDF_I_LENALLOC(inode) = inode->i_size; |
| 131 | } |
| 132 | } |
| 133 | |
Badari Pulavarty | 543ade1 | 2006-09-30 23:28:48 -0700 | [diff] [blame] | 134 | retval = generic_file_aio_write(iocb, iov, nr_segs, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | if (retval > 0) |
| 136 | mark_inode_dirty(inode); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return retval; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * udf_ioctl |
| 143 | * |
| 144 | * PURPOSE |
| 145 | * Issue an ioctl. |
| 146 | * |
| 147 | * DESCRIPTION |
| 148 | * Optional - sys_ioctl() will return -ENOTTY if this routine is not |
| 149 | * available, and the ioctl cannot be handled without filesystem help. |
| 150 | * |
| 151 | * sys_ioctl() handles these ioctls that apply only to regular files: |
| 152 | * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD |
| 153 | * These ioctls are also handled by sys_ioctl(): |
| 154 | * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC |
| 155 | * All other ioctls are passed to the filesystem. |
| 156 | * |
| 157 | * Refer to sys_ioctl() in fs/ioctl.c |
| 158 | * sys_ioctl() -> . |
| 159 | * |
| 160 | * PRE-CONDITIONS |
| 161 | * inode Pointer to inode that ioctl was issued on. |
| 162 | * filp Pointer to file that ioctl was issued on. |
| 163 | * cmd The ioctl command. |
| 164 | * arg The ioctl argument [can be interpreted as a |
| 165 | * user-space pointer if desired]. |
| 166 | * |
| 167 | * POST-CONDITIONS |
| 168 | * <return> Success (>=0) or an error code (<=0) that |
| 169 | * sys_ioctl() will return. |
| 170 | * |
| 171 | * HISTORY |
| 172 | * July 1, 1997 - Andrew E. Mileski |
| 173 | * Written, tested, and released. |
| 174 | */ |
| 175 | int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 176 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 178 | long old_block, new_block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | int result = -EINVAL; |
| 180 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 181 | if (file_permission(filp, MAY_READ) != 0) { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 182 | udf_debug("no permission to access inode %lu\n", |
| 183 | inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return -EPERM; |
| 185 | } |
| 186 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 187 | if (!arg) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | udf_debug("invalid argument to udf_ioctl\n"); |
| 189 | return -EINVAL; |
| 190 | } |
| 191 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 192 | switch (cmd) { |
| 193 | case UDF_GETVOLIDENT: |
| 194 | return copy_to_user((char __user *)arg, |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 195 | UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 196 | case UDF_RELOCATE_BLOCKS: |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 197 | if (!capable(CAP_SYS_ADMIN)) |
| 198 | return -EACCES; |
| 199 | if (get_user(old_block, (long __user *)arg)) |
| 200 | return -EFAULT; |
| 201 | if ((result = udf_relocate_blocks(inode->i_sb, |
| 202 | old_block, &new_block)) == 0) |
| 203 | result = put_user(new_block, (long __user *)arg); |
| 204 | return result; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 205 | case UDF_GETEASIZE: |
| 206 | result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg); |
| 207 | break; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 208 | case UDF_GETEABLOCK: |
| 209 | result = copy_to_user((char __user *)arg, UDF_I_DATA(inode), |
| 210 | UDF_I_LENEATTR(inode)) ? -EFAULT : 0; |
| 211 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | return result; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * udf_release_file |
| 219 | * |
| 220 | * PURPOSE |
| 221 | * Called when all references to the file are closed |
| 222 | * |
| 223 | * DESCRIPTION |
| 224 | * Discard prealloced blocks |
| 225 | * |
| 226 | * HISTORY |
| 227 | * |
| 228 | */ |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 229 | static int udf_release_file(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 231 | if (filp->f_mode & FMODE_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | lock_kernel(); |
| 233 | udf_discard_prealloc(inode); |
| 234 | unlock_kernel(); |
| 235 | } |
| 236 | return 0; |
| 237 | } |
| 238 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 239 | const struct file_operations udf_file_operations = { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 240 | .read = do_sync_read, |
| 241 | .aio_read = generic_file_aio_read, |
| 242 | .ioctl = udf_ioctl, |
| 243 | .open = generic_file_open, |
| 244 | .mmap = generic_file_mmap, |
| 245 | .write = do_sync_write, |
| 246 | .aio_write = udf_file_aio_write, |
| 247 | .release = udf_release_file, |
| 248 | .fsync = udf_fsync_file, |
| 249 | .splice_read = generic_file_splice_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | }; |
| 251 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 252 | const struct inode_operations udf_file_inode_operations = { |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 253 | .truncate = udf_truncate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | }; |