5 * File handling routines for the OSTA-UDF(tm) filesystem.
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.
13 * (C) 1998-1999 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
19 * 10/02/98 dgb Attempt to integrate into udf.o
20 * 10/07/98 Switched to using generic_readpage, etc., like isofs
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
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>
44 static int udf_adinicb_readpage(struct file *file, struct page * page)
46 struct inode *inode = page->mapping->host;
49 BUG_ON(!PageLocked(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);
61 static int udf_adinicb_writepage(struct page *page, struct writeback_control *wbc)
63 struct inode *inode = page->mapping->host;
66 BUG_ON(!PageLocked(page));
69 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
70 mark_inode_dirty(inode);
71 SetPageUptodate(page);
77 static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
83 static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
85 struct inode *inode = page->mapping->host;
86 char *kaddr = page_address(page);
88 memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
89 kaddr + offset, to - offset);
90 mark_inode_dirty(inode);
91 SetPageUptodate(page);
93 /* only one page here */
94 if (to > inode->i_size)
99 const struct address_space_operations udf_adinicb_aops = {
100 .readpage = udf_adinicb_readpage,
101 .writepage = udf_adinicb_writepage,
102 .sync_page = block_sync_page,
103 .prepare_write = udf_adinicb_prepare_write,
104 .commit_write = udf_adinicb_commit_write,
107 static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
108 unsigned long nr_segs, loff_t ppos)
111 struct file *file = iocb->ki_filp;
112 struct inode *inode = file->f_path.dentry->d_inode;
114 size_t count = iocb->ki_left;
116 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
118 if (file->f_flags & O_APPEND)
123 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
126 udf_expand_file_adinicb(inode, pos + count, &err);
127 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
129 udf_debug("udf_expand_adinicb: err=%d\n", err);
135 if (pos + count > inode->i_size)
136 UDF_I_LENALLOC(inode) = pos + count;
138 UDF_I_LENALLOC(inode) = inode->i_size;
142 retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
145 mark_inode_dirty(inode);
156 * Optional - sys_ioctl() will return -ENOTTY if this routine is not
157 * available, and the ioctl cannot be handled without filesystem help.
159 * sys_ioctl() handles these ioctls that apply only to regular files:
160 * FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
161 * These ioctls are also handled by sys_ioctl():
162 * FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
163 * All other ioctls are passed to the filesystem.
165 * Refer to sys_ioctl() in fs/ioctl.c
169 * inode Pointer to inode that ioctl was issued on.
170 * filp Pointer to file that ioctl was issued on.
171 * cmd The ioctl command.
172 * arg The ioctl argument [can be interpreted as a
173 * user-space pointer if desired].
176 * <return> Success (>=0) or an error code (<=0) that
177 * sys_ioctl() will return.
180 * July 1, 1997 - Andrew E. Mileski
181 * Written, tested, and released.
183 int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
186 int result = -EINVAL;
188 if ( file_permission(filp, MAY_READ) != 0 )
190 udf_debug("no permission to access inode %lu\n",
197 udf_debug("invalid argument to udf_ioctl\n");
203 case UDF_GETVOLIDENT:
204 return copy_to_user((char __user *)arg,
205 UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
206 case UDF_RELOCATE_BLOCKS:
210 if (!capable(CAP_SYS_ADMIN)) return -EACCES;
211 if (get_user(old, (long __user *)arg)) return -EFAULT;
212 if ((result = udf_relocate_blocks(inode->i_sb,
214 result = put_user(new, (long __user *)arg);
219 result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
223 result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
224 UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
235 * Called when all references to the file are closed
238 * Discard prealloced blocks
243 static int udf_release_file(struct inode * inode, struct file * filp)
245 if (filp->f_mode & FMODE_WRITE)
248 udf_discard_prealloc(inode);
254 const struct file_operations udf_file_operations = {
255 .read = do_sync_read,
256 .aio_read = generic_file_aio_read,
258 .open = generic_file_open,
259 .mmap = generic_file_mmap,
260 .write = do_sync_write,
261 .aio_write = udf_file_aio_write,
262 .release = udf_release_file,
263 .fsync = udf_fsync_file,
264 .sendfile = generic_file_sendfile,
267 const struct inode_operations udf_file_inode_operations = {
268 .truncate = udf_truncate,