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ovl: plumb through flush method

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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