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

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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/[email protected]
Signed-off-by: Hou Tao <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Jan Kara <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hou Tao 2019-05-14 15:44:32 -07:00 • committed by Linus Torvalds
commit bd8309de0d
1 changed files with 8 additions and 3 deletions
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11
fs/fat/file.c
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@ -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);
}