fsync.c (d59729f4e794f814b25ccd2aebfbe606242c4544) fsync.c (60ad4466821a96913a9b567115e194ed1087c2d7)
1/*
2 * linux/fs/ext4/fsync.c
3 *
4 * Copyright (C) 1993 Stephen Tweedie (sct@redhat.com)
5 * from
6 * Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)

--- 153 unchanged lines hidden (view full) ---

162 ret = sync_inode(inode, &wbc);
163 if (ret)
164 break;
165 }
166 iput(inode);
167 return ret;
168}
169
1/*
2 * linux/fs/ext4/fsync.c
3 *
4 * Copyright (C) 1993 Stephen Tweedie (sct@redhat.com)
5 * from
6 * Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)

--- 153 unchanged lines hidden (view full) ---

162 ret = sync_inode(inode, &wbc);
163 if (ret)
164 break;
165 }
166 iput(inode);
167 return ret;
168}
169
170/**
171 * __sync_file - generic_file_fsync without the locking and filemap_write
172 * @inode: inode to sync
173 * @datasync: only sync essential metadata if true
174 *
175 * This is just generic_file_fsync without the locking. This is needed for
176 * nojournal mode to make sure this inodes data/metadata makes it to disk
177 * properly. The i_mutex should be held already.
178 */
179static int __sync_inode(struct inode *inode, int datasync)
180{
181 int err;
182 int ret;
183
184 ret = sync_mapping_buffers(inode->i_mapping);
185 if (!(inode->i_state & I_DIRTY))
186 return ret;
187 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
188 return ret;
189
190 err = sync_inode_metadata(inode, 1);
191 if (ret == 0)
192 ret = err;
193 return ret;
194}
195
170/*
171 * akpm: A new design for ext4_sync_file().
172 *
173 * This is only called from sys_fsync(), sys_fdatasync() and sys_msync().
174 * There cannot be a transaction open by this task.
175 * Another task could have dirtied this inode. Its data can be in any
176 * state in the journalling system.
177 *
178 * What we do is just kick off a commit and wait on it. This will snapshot the
179 * inode to disk.
180 *
181 * i_mutex lock is held when entering and exiting this function
182 */
183
196/*
197 * akpm: A new design for ext4_sync_file().
198 *
199 * This is only called from sys_fsync(), sys_fdatasync() and sys_msync().
200 * There cannot be a transaction open by this task.
201 * Another task could have dirtied this inode. Its data can be in any
202 * state in the journalling system.
203 *
204 * What we do is just kick off a commit and wait on it. This will snapshot the
205 * inode to disk.
206 *
207 * i_mutex lock is held when entering and exiting this function
208 */
209
184int ext4_sync_file(struct file *file, int datasync)
210int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
185{
186 struct inode *inode = file->f_mapping->host;
187 struct ext4_inode_info *ei = EXT4_I(inode);
188 journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
189 int ret;
190 tid_t commit_tid;
191 bool needs_barrier = false;
192
193 J_ASSERT(ext4_journal_current_handle() == NULL);
194
195 trace_ext4_sync_file_enter(file, datasync);
196
211{
212 struct inode *inode = file->f_mapping->host;
213 struct ext4_inode_info *ei = EXT4_I(inode);
214 journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
215 int ret;
216 tid_t commit_tid;
217 bool needs_barrier = false;
218
219 J_ASSERT(ext4_journal_current_handle() == NULL);
220
221 trace_ext4_sync_file_enter(file, datasync);
222
223 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
224 if (ret)
225 return ret;
226 mutex_lock(&inode->i_mutex);
227
197 if (inode->i_sb->s_flags & MS_RDONLY)
228 if (inode->i_sb->s_flags & MS_RDONLY)
198 return 0;
229 goto out;
199
200 ret = ext4_flush_completed_IO(inode);
201 if (ret < 0)
202 goto out;
203
204 if (!journal) {
230
231 ret = ext4_flush_completed_IO(inode);
232 if (ret < 0)
233 goto out;
234
235 if (!journal) {
205 ret = generic_file_fsync(file, datasync);
236 ret = __sync_inode(inode, datasync);
206 if (!ret && !list_empty(&inode->i_dentry))
207 ret = ext4_sync_parent(inode);
208 goto out;
209 }
210
211 /*
212 * data=writeback,ordered:
213 * The caller's filemap_fdatawrite()/wait will sync the data.

--- 17 unchanged lines hidden (view full) ---

231 if (journal->j_flags & JBD2_BARRIER &&
232 !jbd2_trans_will_send_data_barrier(journal, commit_tid))
233 needs_barrier = true;
234 jbd2_log_start_commit(journal, commit_tid);
235 ret = jbd2_log_wait_commit(journal, commit_tid);
236 if (needs_barrier)
237 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
238 out:
237 if (!ret && !list_empty(&inode->i_dentry))
238 ret = ext4_sync_parent(inode);
239 goto out;
240 }
241
242 /*
243 * data=writeback,ordered:
244 * The caller's filemap_fdatawrite()/wait will sync the data.

--- 17 unchanged lines hidden (view full) ---

262 if (journal->j_flags & JBD2_BARRIER &&
263 !jbd2_trans_will_send_data_barrier(journal, commit_tid))
264 needs_barrier = true;
265 jbd2_log_start_commit(journal, commit_tid);
266 ret = jbd2_log_wait_commit(journal, commit_tid);
267 if (needs_barrier)
268 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
269 out:
270 mutex_unlock(&inode->i_mutex);
239 trace_ext4_sync_file_exit(inode, ret);
240 return ret;
241}
271 trace_ext4_sync_file_exit(inode, ret);
272 return ret;
273}