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25#include <linux/time.h>
26#include <linux/fs.h>
27#include <linux/sched.h>
28#include <linux/writeback.h>
29#include <linux/jbd2.h>
30#include <linux/blkdev.h>
31
32#include "ext4.h"
33#include "ext4_jbd2.h"
34
35#include <trace/events/ext4.h>
36
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44
45static int ext4_sync_parent(struct inode *inode)
46{
47 struct dentry *dentry = NULL;
48 struct inode *next;
49 int ret = 0;
50
51 if (!ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
52 return 0;
53 inode = igrab(inode);
54 while (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) {
55 ext4_clear_inode_state(inode, EXT4_STATE_NEWENTRY);
56 dentry = d_find_any_alias(inode);
57 if (!dentry)
58 break;
59 next = igrab(dentry->d_parent->d_inode);
60 dput(dentry);
61 if (!next)
62 break;
63 iput(inode);
64 inode = next;
65 ret = sync_mapping_buffers(inode->i_mapping);
66 if (ret)
67 break;
68 ret = sync_inode_metadata(inode, 1);
69 if (ret)
70 break;
71 }
72 iput(inode);
73 return ret;
74}
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87
88int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
89{
90 struct inode *inode = file->f_mapping->host;
91 struct ext4_inode_info *ei = EXT4_I(inode);
92 journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
93 int ret = 0, err;
94 tid_t commit_tid;
95 bool needs_barrier = false;
96
97 J_ASSERT(ext4_journal_current_handle() == NULL);
98
99 trace_ext4_sync_file_enter(file, datasync);
100
101 if (inode->i_sb->s_flags & MS_RDONLY) {
102
103 smp_rmb();
104 if (EXT4_SB(inode->i_sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
105 ret = -EROFS;
106 goto out;
107 }
108
109 if (!journal) {
110 ret = generic_file_fsync(file, start, end, datasync);
111 if (!ret && !hlist_empty(&inode->i_dentry))
112 ret = ext4_sync_parent(inode);
113 goto out;
114 }
115
116 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
117 if (ret)
118 return ret;
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133 if (ext4_should_journal_data(inode)) {
134 ret = ext4_force_commit(inode->i_sb);
135 goto out;
136 }
137
138 commit_tid = datasync ? ei->i_datasync_tid : ei->i_sync_tid;
139 if (journal->j_flags & JBD2_BARRIER &&
140 !jbd2_trans_will_send_data_barrier(journal, commit_tid))
141 needs_barrier = true;
142 ret = jbd2_complete_transaction(journal, commit_tid);
143 if (needs_barrier) {
144 err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
145 if (!ret)
146 ret = err;
147 }
148out:
149 trace_ext4_sync_file_exit(inode, ret);
150 return ret;
151}
152