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> |
| 33 | #include <linux/string.h> /* memset */ |
| 34 | #include <linux/errno.h> |
| 35 | #include <linux/smp_lock.h> |
| 36 | #include <linux/pagemap.h> |
| 37 | #include <linux/buffer_head.h> |
| 38 | |
| 39 | #include "udf_i.h" |
| 40 | #include "udf_sb.h" |
| 41 | |
| 42 | static int udf_adinicb_readpage(struct file *file, struct page * page) |
| 43 | { |
| 44 | struct inode *inode = page->mapping->host; |
| 45 | char *kaddr; |
| 46 | |
Matt Mackall | cd7619d | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 47 | BUG_ON(!PageLocked(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | kaddr = kmap(page); |
| 50 | memset(kaddr, 0, PAGE_CACHE_SIZE); |
| 51 | memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size); |
| 52 | flush_dcache_page(page); |
| 53 | SetPageUptodate(page); |
| 54 | kunmap(page); |
| 55 | unlock_page(page); |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc) |
| 60 | { |
| 61 | struct inode *inode = page->mapping->host; |
| 62 | char *kaddr; |
| 63 | |
Matt Mackall | cd7619d | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 64 | BUG_ON(!PageLocked(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | kaddr = kmap(page); |
| 67 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size); |
| 68 | mark_inode_dirty(inode); |
| 69 | SetPageUptodate(page); |
| 70 | kunmap(page); |
| 71 | unlock_page(page); |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) |
| 76 | { |
| 77 | kmap(page); |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) |
| 82 | { |
| 83 | struct inode *inode = page->mapping->host; |
| 84 | char *kaddr = page_address(page); |
| 85 | |
| 86 | memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, |
| 87 | kaddr + offset, to - offset); |
| 88 | mark_inode_dirty(inode); |
| 89 | SetPageUptodate(page); |
| 90 | kunmap(page); |
| 91 | /* only one page here */ |
| 92 | if (to > inode->i_size) |
| 93 | inode->i_size = to; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | struct address_space_operations udf_adinicb_aops = { |
| 98 | .readpage = udf_adinicb_readpage, |
| 99 | .writepage = udf_adinicb_writepage, |
| 100 | .sync_page = block_sync_page, |
| 101 | .prepare_write = udf_adinicb_prepare_write, |
| 102 | .commit_write = udf_adinicb_commit_write, |
| 103 | }; |
| 104 | |
| 105 | static ssize_t udf_file_write(struct file * file, const char __user * buf, |
| 106 | size_t count, loff_t *ppos) |
| 107 | { |
| 108 | ssize_t retval; |
| 109 | struct inode *inode = file->f_dentry->d_inode; |
| 110 | int err, pos; |
| 111 | |
| 112 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 113 | { |
| 114 | if (file->f_flags & O_APPEND) |
| 115 | pos = inode->i_size; |
| 116 | else |
| 117 | pos = *ppos; |
| 118 | |
| 119 | if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) + |
| 120 | pos + count)) |
| 121 | { |
| 122 | udf_expand_file_adinicb(inode, pos + count, &err); |
| 123 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) |
| 124 | { |
| 125 | udf_debug("udf_expand_adinicb: err=%d\n", err); |
| 126 | return err; |
| 127 | } |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | if (pos + count > inode->i_size) |
| 132 | UDF_I_LENALLOC(inode) = pos + count; |
| 133 | else |
| 134 | UDF_I_LENALLOC(inode) = inode->i_size; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | retval = generic_file_write(file, buf, count, ppos); |
| 139 | |
| 140 | if (retval > 0) |
| 141 | mark_inode_dirty(inode); |
| 142 | return retval; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * udf_ioctl |
| 147 | * |
| 148 | * PURPOSE |
| 149 | * Issue an ioctl. |
| 150 | * |
| 151 | * DESCRIPTION |
| 152 | * Optional - sys_ioctl() will return -ENOTTY if this routine is not |
| 153 | * available, and the ioctl cannot be handled without filesystem help. |
| 154 | * |
| 155 | * sys_ioctl() handles these ioctls that apply only to regular files: |
| 156 | * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD |
| 157 | * These ioctls are also handled by sys_ioctl(): |
| 158 | * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC |
| 159 | * All other ioctls are passed to the filesystem. |
| 160 | * |
| 161 | * Refer to sys_ioctl() in fs/ioctl.c |
| 162 | * sys_ioctl() -> . |
| 163 | * |
| 164 | * PRE-CONDITIONS |
| 165 | * inode Pointer to inode that ioctl was issued on. |
| 166 | * filp Pointer to file that ioctl was issued on. |
| 167 | * cmd The ioctl command. |
| 168 | * arg The ioctl argument [can be interpreted as a |
| 169 | * user-space pointer if desired]. |
| 170 | * |
| 171 | * POST-CONDITIONS |
| 172 | * <return> Success (>=0) or an error code (<=0) that |
| 173 | * sys_ioctl() will return. |
| 174 | * |
| 175 | * HISTORY |
| 176 | * July 1, 1997 - Andrew E. Mileski |
| 177 | * Written, tested, and released. |
| 178 | */ |
| 179 | int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
| 180 | unsigned long arg) |
| 181 | { |
| 182 | int result = -EINVAL; |
| 183 | |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 184 | if ( file_permission(filp, MAY_READ) != 0 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | udf_debug("no permission to access inode %lu\n", |
| 187 | inode->i_ino); |
| 188 | return -EPERM; |
| 189 | } |
| 190 | |
| 191 | if ( !arg ) |
| 192 | { |
| 193 | udf_debug("invalid argument to udf_ioctl\n"); |
| 194 | return -EINVAL; |
| 195 | } |
| 196 | |
| 197 | switch (cmd) |
| 198 | { |
| 199 | case UDF_GETVOLIDENT: |
| 200 | return copy_to_user((char __user *)arg, |
| 201 | UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0; |
| 202 | case UDF_RELOCATE_BLOCKS: |
| 203 | { |
| 204 | long old, new; |
| 205 | |
| 206 | if (!capable(CAP_SYS_ADMIN)) return -EACCES; |
| 207 | if (get_user(old, (long __user *)arg)) return -EFAULT; |
| 208 | if ((result = udf_relocate_blocks(inode->i_sb, |
| 209 | old, &new)) == 0) |
| 210 | result = put_user(new, (long __user *)arg); |
| 211 | |
| 212 | return result; |
| 213 | } |
| 214 | case UDF_GETEASIZE: |
| 215 | result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg); |
| 216 | break; |
| 217 | |
| 218 | case UDF_GETEABLOCK: |
| 219 | result = copy_to_user((char __user *)arg, UDF_I_DATA(inode), |
| 220 | UDF_I_LENEATTR(inode)) ? -EFAULT : 0; |
| 221 | break; |
| 222 | } |
| 223 | |
| 224 | return result; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * udf_release_file |
| 229 | * |
| 230 | * PURPOSE |
| 231 | * Called when all references to the file are closed |
| 232 | * |
| 233 | * DESCRIPTION |
| 234 | * Discard prealloced blocks |
| 235 | * |
| 236 | * HISTORY |
| 237 | * |
| 238 | */ |
| 239 | static int udf_release_file(struct inode * inode, struct file * filp) |
| 240 | { |
| 241 | if (filp->f_mode & FMODE_WRITE) |
| 242 | { |
| 243 | lock_kernel(); |
| 244 | udf_discard_prealloc(inode); |
| 245 | unlock_kernel(); |
| 246 | } |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | struct file_operations udf_file_operations = { |
| 251 | .read = generic_file_read, |
| 252 | .ioctl = udf_ioctl, |
| 253 | .open = generic_file_open, |
| 254 | .mmap = generic_file_mmap, |
| 255 | .write = udf_file_write, |
| 256 | .release = udf_release_file, |
| 257 | .fsync = udf_fsync_file, |
| 258 | .sendfile = generic_file_sendfile, |
| 259 | }; |
| 260 | |
| 261 | struct inode_operations udf_file_inode_operations = { |
| 262 | .truncate = udf_truncate, |
| 263 | }; |