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ovl: plumb through flush method 

Filesystems can implement their own flush method that release
resources, or manipulate caches. Currently if one of these
filesystems is used with overlayfs, the flush method is not called.

[Amir: fix fd leak in ovl_flush()]

Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Sargun Dhillon 2020-11-29 19:00:39 -08:00 committed by Miklos Szeredi
parent e49d033bdd
commit 1f0cb8bcc7
1 changed files with 21 additions and 0 deletions
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21
fs/overlayfs/file.c
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@ -686,6 +686,26 @@ static loff_t ovl_remap_file_range(struct file *file_in, loff_t pos_in,
remap_flags, op);
}
static int ovl_flush(struct file *file, fl_owner_t id)
{
struct fd real;
const struct cred *old_cred;
int err;
err = ovl_real_fdget(file, &real);
if (err)
return err;
if (real.file->f_op->flush) {
old_cred = ovl_override_creds(file_inode(file)->i_sb);
err = real.file->f_op->flush(real.file, id);
revert_creds(old_cred);
}
fdput(real);
return err;
}
const struct file_operations ovl_file_operations = {
.open = ovl_open,
.release = ovl_release,
@ -697,6 +717,7 @@ const struct file_operations ovl_file_operations = {
.fallocate = ovl_fallocate,
.fadvise = ovl_fadvise,
.unlocked_ioctl = ovl_ioctl,
.flush = ovl_flush,
#ifdef CONFIG_COMPAT
.compat_ioctl = ovl_compat_ioctl,
#endif