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Linux/fs/udf/file.c

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  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/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/pagemap.h>
 36 #include <linux/uio.h>
 37 
 38 #include "udf_i.h"
 39 #include "udf_sb.h"
 40 
 41 static void __udf_adinicb_readpage(struct page *page)
 42 {
 43         struct inode *inode = page->mapping->host;
 44         char *kaddr;
 45         struct udf_inode_info *iinfo = UDF_I(inode);
 46 
 47         kaddr = kmap(page);
 48         memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
 49         memset(kaddr + inode->i_size, 0, PAGE_SIZE - inode->i_size);
 50         flush_dcache_page(page);
 51         SetPageUptodate(page);
 52         kunmap(page);
 53 }
 54 
 55 static int udf_adinicb_readpage(struct file *file, struct page *page)
 56 {
 57         BUG_ON(!PageLocked(page));
 58         __udf_adinicb_readpage(page);
 59         unlock_page(page);
 60 
 61         return 0;
 62 }
 63 
 64 static int udf_adinicb_writepage(struct page *page,
 65                                  struct writeback_control *wbc)
 66 {
 67         struct inode *inode = page->mapping->host;
 68         char *kaddr;
 69         struct udf_inode_info *iinfo = UDF_I(inode);
 70 
 71         BUG_ON(!PageLocked(page));
 72 
 73         kaddr = kmap(page);
 74         memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
 75         mark_inode_dirty(inode);
 76         SetPageUptodate(page);
 77         kunmap(page);
 78         unlock_page(page);
 79 
 80         return 0;
 81 }
 82 
 83 static int udf_adinicb_write_begin(struct file *file,
 84                         struct address_space *mapping, loff_t pos,
 85                         unsigned len, unsigned flags, struct page **pagep,
 86                         void **fsdata)
 87 {
 88         struct page *page;
 89 
 90         if (WARN_ON_ONCE(pos >= PAGE_SIZE))
 91                 return -EIO;
 92         page = grab_cache_page_write_begin(mapping, 0, flags);
 93         if (!page)
 94                 return -ENOMEM;
 95         *pagep = page;
 96 
 97         if (!PageUptodate(page) && len != PAGE_SIZE)
 98                 __udf_adinicb_readpage(page);
 99         return 0;
100 }
101 
102 static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
103 {
104         /* Fallback to buffered I/O. */
105         return 0;
106 }
107 
108 const struct address_space_operations udf_adinicb_aops = {
109         .readpage       = udf_adinicb_readpage,
110         .writepage      = udf_adinicb_writepage,
111         .write_begin    = udf_adinicb_write_begin,
112         .write_end      = simple_write_end,
113         .direct_IO      = udf_adinicb_direct_IO,
114 };
115 
116 static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
117 {
118         ssize_t retval;
119         struct file *file = iocb->ki_filp;
120         struct inode *inode = file_inode(file);
121         struct udf_inode_info *iinfo = UDF_I(inode);
122         int err;
123 
124         inode_lock(inode);
125 
126         retval = generic_write_checks(iocb, from);
127         if (retval <= 0)
128                 goto out;
129 
130         down_write(&iinfo->i_data_sem);
131         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
132                 loff_t end = iocb->ki_pos + iov_iter_count(from);
133 
134                 if (inode->i_sb->s_blocksize <
135                                 (udf_file_entry_alloc_offset(inode) + end)) {
136                         err = udf_expand_file_adinicb(inode);
137                         if (err) {
138                                 inode_unlock(inode);
139                                 udf_debug("udf_expand_adinicb: err=%d\n", err);
140                                 return err;
141                         }
142                 } else {
143                         iinfo->i_lenAlloc = max(end, inode->i_size);
144                         up_write(&iinfo->i_data_sem);
145                 }
146         } else
147                 up_write(&iinfo->i_data_sem);
148 
149         retval = __generic_file_write_iter(iocb, from);
150 out:
151         inode_unlock(inode);
152 
153         if (retval > 0) {
154                 mark_inode_dirty(inode);
155                 retval = generic_write_sync(iocb, retval);
156         }
157 
158         return retval;
159 }
160 
161 long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
162 {
163         struct inode *inode = file_inode(filp);
164         long old_block, new_block;
165         int result = -EINVAL;
166 
167         if (inode_permission(inode, MAY_READ) != 0) {
168                 udf_debug("no permission to access inode %lu\n", inode->i_ino);
169                 result = -EPERM;
170                 goto out;
171         }
172 
173         if (!arg) {
174                 udf_debug("invalid argument to udf_ioctl\n");
175                 result = -EINVAL;
176                 goto out;
177         }
178 
179         switch (cmd) {
180         case UDF_GETVOLIDENT:
181                 if (copy_to_user((char __user *)arg,
182                                  UDF_SB(inode->i_sb)->s_volume_ident, 32))
183                         result = -EFAULT;
184                 else
185                         result = 0;
186                 goto out;
187         case UDF_RELOCATE_BLOCKS:
188                 if (!capable(CAP_SYS_ADMIN)) {
189                         result = -EPERM;
190                         goto out;
191                 }
192                 if (get_user(old_block, (long __user *)arg)) {
193                         result = -EFAULT;
194                         goto out;
195                 }
196                 result = udf_relocate_blocks(inode->i_sb,
197                                                 old_block, &new_block);
198                 if (result == 0)
199                         result = put_user(new_block, (long __user *)arg);
200                 goto out;
201         case UDF_GETEASIZE:
202                 result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
203                 goto out;
204         case UDF_GETEABLOCK:
205                 result = copy_to_user((char __user *)arg,
206                                       UDF_I(inode)->i_ext.i_data,
207                                       UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
208                 goto out;
209         }
210 
211 out:
212         return result;
213 }
214 
215 static int udf_release_file(struct inode *inode, struct file *filp)
216 {
217         if (filp->f_mode & FMODE_WRITE &&
218             atomic_read(&inode->i_writecount) == 1) {
219                 /*
220                  * Grab i_mutex to avoid races with writes changing i_size
221                  * while we are running.
222                  */
223                 inode_lock(inode);
224                 down_write(&UDF_I(inode)->i_data_sem);
225                 udf_discard_prealloc(inode);
226                 udf_truncate_tail_extent(inode);
227                 up_write(&UDF_I(inode)->i_data_sem);
228                 inode_unlock(inode);
229         }
230         return 0;
231 }
232 
233 const struct file_operations udf_file_operations = {
234         .read_iter              = generic_file_read_iter,
235         .unlocked_ioctl         = udf_ioctl,
236         .open                   = generic_file_open,
237         .mmap                   = generic_file_mmap,
238         .write_iter             = udf_file_write_iter,
239         .release                = udf_release_file,
240         .fsync                  = generic_file_fsync,
241         .splice_read            = generic_file_splice_read,
242         .llseek                 = generic_file_llseek,
243 };
244 
245 static int udf_setattr(struct dentry *dentry, struct iattr *attr)
246 {
247         struct inode *inode = d_inode(dentry);
248         int error;
249 
250         error = inode_change_ok(inode, attr);
251         if (error)
252                 return error;
253 
254         if ((attr->ia_valid & ATTR_SIZE) &&
255             attr->ia_size != i_size_read(inode)) {
256                 error = udf_setsize(inode, attr->ia_size);
257                 if (error)
258                         return error;
259         }
260 
261         setattr_copy(inode, attr);
262         mark_inode_dirty(inode);
263         return 0;
264 }
265 
266 const struct inode_operations udf_file_inode_operations = {
267         .setattr                = udf_setattr,
268 };
269 

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