Commit bd8309de authored by Hou Tao's avatar Hou Tao Committed by Linus Torvalds

fs/fat/file.c: issue flush after the writeback of FAT

fsync() needs to make sure the data & meta-data of file are persistent
after the return of fsync(), even when a power-failure occurs later.  In
the case of fat-fs, the FAT belongs to the meta-data of file, so we need
to issue a flush after the writeback of FAT instead before.

Also bail out early when any stage of fsync fails.

Link: http://lkml.kernel.org/r/20190409030158.136316-1-houtao1@huawei.comSigned-off-by: default avatarHou Tao <houtao1@huawei.com>
Acked-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 672cdd56
......@@ -193,12 +193,17 @@ static int fat_file_release(struct inode *inode, struct file *filp)
int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
struct inode *inode = filp->f_mapping->host;
int res, err;
int err;
err = __generic_file_fsync(filp, start, end, datasync);
if (err)
return err;
res = generic_file_fsync(filp, start, end, datasync);
err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
if (err)
return err;
return res ? res : err;
return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
}
......
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