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Subject[RFC PATCH 4/4] ext4: wire it up to the new writeback error reporting infrastructure
Date
Convert ext4 to use filemap_set_wb_error for reporting writeback errors
instead of mapping_set_error. Ensure that it calls filemap_report_wb_error
before returning from fsync, and add a new flush operation that ensures
that just calls filemap_report_wb_error before returning.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/ext4/dir.c | 1 +
fs/ext4/ext4.h | 1 +
fs/ext4/file.c | 1 +
fs/ext4/fsync.c | 15 +++++++++++----
fs/ext4/inode.c | 2 +-
fs/ext4/page-io.c | 4 ++--
6 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index e8b365000d73..c333b148b5fe 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -656,6 +656,7 @@ const struct file_operations ext4_dir_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ext4_compat_ioctl,
#endif
+ .flush = ext4_flush_file,
.fsync = ext4_sync_file,
.open = ext4_dir_open,
.release = ext4_release_dir,
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f493af666591..20437bedeed0 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2382,6 +2382,7 @@ extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,

/* fsync.c */
extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
+extern int ext4_flush_file(struct file *, fl_owner_t);

/* hash.c */
extern int ext4fs_dirhash(const char *name, int len, struct
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 8210c1f43556..cc536a1aa731 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -735,6 +735,7 @@ const struct file_operations ext4_file_operations = {
.mmap = ext4_file_mmap,
.open = ext4_file_open,
.release = ext4_release_file,
+ .flush = ext4_flush_file,
.fsync = ext4_sync_file,
.get_unmapped_area = thp_get_unmapped_area,
.splice_read = generic_file_splice_read,
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 9d549608fd30..e381ab03f1cc 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -79,6 +79,11 @@ static int ext4_sync_parent(struct inode *inode)
return ret;
}

+int ext4_flush_file(struct file *file, fl_owner_t id)
+{
+ return filemap_report_wb_error(file);
+}
+
/*
* akpm: A new design for ext4_sync_file().
*
@@ -96,12 +101,12 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
struct inode *inode = file->f_mapping->host;
struct ext4_inode_info *ei = EXT4_I(inode);
journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
- int ret = 0, err;
+ int ret = -EIO, err;
tid_t commit_tid;
bool needs_barrier = false;

if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
- return -EIO;
+ goto out;

J_ASSERT(ext4_journal_current_handle() == NULL);

@@ -110,6 +115,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
if (inode->i_sb->s_flags & MS_RDONLY) {
/* Make sure that we read updated s_mount_flags value */
smp_rmb();
+ ret = 0;
if (EXT4_SB(inode->i_sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
ret = -EROFS;
goto out;
@@ -126,7 +132,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)

ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
if (ret)
- return ret;
+ goto out;
/*
* data=writeback,ordered:
* The caller's filemap_fdatawrite()/wait will sync the data.
@@ -159,5 +165,6 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
}
out:
trace_ext4_sync_file_exit(inode, ret);
- return ret;
+ err = filemap_report_wb_error(file);
+ return ret ? : err;
}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4247d8d25687..b9c8a73c404b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2634,7 +2634,7 @@ static int __writepage(struct page *page, struct writeback_control *wbc,
{
struct address_space *mapping = data;
int ret = ext4_writepage(page, wbc);
- mapping_set_error(mapping, ret);
+ filemap_set_wb_error(mapping, ret);
return ret;
}

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 208241b06662..5adcf5d0ee9a 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -87,7 +87,7 @@ static void ext4_finish_bio(struct bio *bio)

if (bio->bi_error) {
SetPageError(page);
- mapping_set_error(page->mapping, -EIO);
+ filemap_set_wb_error(page->mapping, -EIO);
}
bh = head = page_buffers(page);
/*
@@ -311,7 +311,7 @@ static void ext4_end_bio(struct bio *bio)
(long) io_end->size,
(unsigned long long)
bi_sector >> (inode->i_blkbits - 9));
- mapping_set_error(inode->i_mapping, bio->bi_error);
+ filemap_set_wb_error(inode->i_mapping, bio->bi_error);
}

if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
--
2.9.3
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