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ovl: add lsattr/chattr support
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Implement FS_IOC_GETFLAGS and FS_IOC_SETFLAGS.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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Miklos Szeredi committed Jul 18, 2018
1 parent aab8848 commit dab5ca8
Showing 1 changed file with 79 additions and 0 deletions.
79 changes: 79 additions & 0 deletions fs/overlayfs/file.c
Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@

#include <linux/cred.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/xattr.h>
#include <linux/uio.h>
#include "overlayfs.h"
Expand Down Expand Up @@ -309,6 +310,82 @@ static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len
return ret;
}

static long ovl_real_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct fd real;
const struct cred *old_cred;
long ret;

ret = ovl_real_fdget(file, &real);
if (ret)
return ret;

old_cred = ovl_override_creds(file_inode(file)->i_sb);
ret = vfs_ioctl(real.file, cmd, arg);
revert_creds(old_cred);

fdput(real);

return ret;
}

static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
struct inode *inode = file_inode(file);

switch (cmd) {
case FS_IOC_GETFLAGS:
ret = ovl_real_ioctl(file, cmd, arg);
break;

case FS_IOC_SETFLAGS:
if (!inode_owner_or_capable(inode))
return -EACCES;

ret = mnt_want_write_file(file);
if (ret)
return ret;

ret = ovl_copy_up(file_dentry(file));
if (!ret) {
ret = ovl_real_ioctl(file, cmd, arg);

inode_lock(inode);
ovl_copyflags(ovl_inode_real(inode), inode);
inode_unlock(inode);
}

mnt_drop_write_file(file);
break;

default:
ret = -ENOTTY;
}

return ret;
}

static long ovl_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
break;

case FS_IOC32_SETFLAGS:
cmd = FS_IOC_SETFLAGS;
break;

default:
return -ENOIOCTLCMD;
}

return ovl_ioctl(file, cmd, arg);
}

const struct file_operations ovl_file_operations = {
.open = ovl_open,
.release = ovl_release,
Expand All @@ -318,4 +395,6 @@ const struct file_operations ovl_file_operations = {
.fsync = ovl_fsync,
.mmap = ovl_mmap,
.fallocate = ovl_fallocate,
.unlocked_ioctl = ovl_ioctl,
.compat_ioctl = ovl_compat_ioctl,
};

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