*/
#include <linux/time.h>
+#include <linux/blkdev.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/writeback.h>
* inode to disk.
*/
-int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
+int ext3_sync_file(struct file *file, int datasync)
{
- struct inode *inode = dentry->d_inode;
- int ret = 0;
+ struct inode *inode = file->f_mapping->host;
+ struct ext3_inode_info *ei = EXT3_I(inode);
+ journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
+ int ret, needs_barrier = 0;
+ tid_t commit_tid;
- J_ASSERT(ext3_journal_current_handle() == 0);
+ if (inode->i_sb->s_flags & MS_RDONLY)
+ return 0;
+
+ J_ASSERT(ext3_journal_current_handle() == NULL);
/*
- * data=writeback:
+ * data=writeback,ordered:
* The caller's filemap_fdatawrite()/wait will sync the data.
- * sync_inode() will sync the metadata
- *
- * data=ordered:
- * The caller's filemap_fdatawrite() will write the data and
- * sync_inode() will write the inode if it is dirty. Then the caller's
- * filemap_fdatawait() will wait on the pages.
+ * Metadata is in the journal, we wait for a proper transaction
+ * to commit here.
*
* data=journal:
* filemap_fdatawrite won't do anything (the buffers are clean).
* (they were dirtied by commit). But that's OK - the blocks are
* safe in-journal, which is all fsync() needs to ensure.
*/
- if (ext3_should_journal_data(inode)) {
- ret = ext3_force_commit(inode->i_sb);
- goto out;
- }
+ if (ext3_should_journal_data(inode))
+ return ext3_force_commit(inode->i_sb);
+
+ if (datasync)
+ commit_tid = atomic_read(&ei->i_datasync_tid);
+ else
+ commit_tid = atomic_read(&ei->i_sync_tid);
+
+ if (test_opt(inode->i_sb, BARRIER) &&
+ !journal_trans_will_send_data_barrier(journal, commit_tid))
+ needs_barrier = 1;
+ log_start_commit(journal, commit_tid);
+ ret = log_wait_commit(journal, commit_tid);
/*
- * The VFS has written the file data. If the inode is unaltered
- * then we need not start a commit.
+ * In case we didn't commit a transaction, we have to flush
+ * disk caches manually so that data really is on persistent
+ * storage
*/
- if (inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC)) {
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_ALL,
- .nr_to_write = 0, /* sys_fsync did this */
- };
- ret = sync_inode(inode, &wbc);
- }
-out:
+ if (needs_barrier)
+ blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL,
+ BLKDEV_IFL_WAIT);
return ret;
}