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ovl: add ovl_fiemap()

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Implement stacked fiemap().

Need to split inode operations for regular file (which has fiemap) and
special file (which doesn't have fiemap).

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-07-18 15:44:42 +02:00
parent dab5ca8fd9
commit 9e142c4102
1 changed files with 28 additions and 1 deletions
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29
fs/overlayfs/inode.c
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@ -448,6 +448,23 @@ int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags)
return 0;
}
static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len)
{
int err;
struct inode *realinode = ovl_inode_real(inode);
const struct cred *old_cred;
if (!realinode->i_op->fiemap)
return -EOPNOTSUPP;
old_cred = ovl_override_creds(inode->i_sb);
err = realinode->i_op->fiemap(realinode, fieinfo, start, len);
revert_creds(old_cred);
return err;
}
static const struct inode_operations ovl_file_inode_operations = {
.setattr = ovl_setattr,
.permission = ovl_permission,
@ -455,6 +472,7 @@ static const struct inode_operations ovl_file_inode_operations = {
.listxattr = ovl_listxattr,
.get_acl = ovl_get_acl,
.update_time = ovl_update_time,
.fiemap = ovl_fiemap,
};
static const struct inode_operations ovl_symlink_inode_operations = {
@ -465,6 +483,15 @@ static const struct inode_operations ovl_symlink_inode_operations = {
.update_time = ovl_update_time,
};
static const struct inode_operations ovl_special_inode_operations = {
.setattr = ovl_setattr,
.permission = ovl_permission,
.getattr = ovl_getattr,
.listxattr = ovl_listxattr,
.get_acl = ovl_get_acl,
.update_time = ovl_update_time,
};
/*
* It is possible to stack overlayfs instance on top of another
* overlayfs instance as lower layer. We need to annonate the
@ -548,7 +575,7 @@ static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
break;
default:
inode->i_op = &ovl_file_inode_operations;
inode->i_op = &ovl_special_inode_operations;
init_special_inode(inode, mode, rdev);
break;
}