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Expose additional file level attributes

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ZFS allows to update and retrieve additional file level attributes for
FreeBSD. This commit allows additional file level attributes to be
updated and retrieved for Linux. These include the flags stored in the
upper half of z_pflags only.

Two new IOCTLs have been added for this purpose. ZFS_IOC_GETDOSFLAGS
can be used to retrieve the attributes, while ZFS_IOC_SETDOSFLAGS can
be used to update the attributes.

Attributes that are allowed to be updated include ZFS_IMMUTABLE,
ZFS_APPENDONLY, ZFS_NOUNLINK, ZFS_ARCHIVE, ZFS_NODUMP, ZFS_SYSTEM,
ZFS_HIDDEN, ZFS_READONLY, ZFS_REPARSE, ZFS_OFFLINE and ZFS_SPARSE.
Flags can be or'd together while calling ZFS_IOC_SETDOSFLAGS.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Umer Saleem <usaleem@ixsystems.com>
Closes #13118
This commit is contained in:
Umer Saleem
2022-03-08 06:52:03 +05:00
committed by GitHub
parent 9955b9ba2e
commit 39a4daf742
24 changed files with 804 additions and 62 deletions
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module/os/linux/zfs/zpl_file.c
+108 -13
View File
@@ -905,21 +905,24 @@ __zpl_ioctl_setflags(struct inode *ip, uint32_t ioctl_flags, xvattr_t *xva)
xva_init(xva);
xoap = xva_getxoptattr(xva);
XVA_SET_REQ(xva, XAT_IMMUTABLE);
if (ioctl_flags & FS_IMMUTABLE_FL)
xoap->xoa_immutable = B_TRUE;
#define FLAG_CHANGE(iflag, zflag, xflag, xfield) do { \
if (((ioctl_flags & (iflag)) && !(zfs_flags & (zflag))) || \
((zfs_flags & (zflag)) && !(ioctl_flags & (iflag)))) { \
XVA_SET_REQ(xva, (xflag)); \
(xfield) = ((ioctl_flags & (iflag)) != 0); \
} \
} while (0)
XVA_SET_REQ(xva, XAT_APPENDONLY);
if (ioctl_flags & FS_APPEND_FL)
xoap->xoa_appendonly = B_TRUE;
FLAG_CHANGE(FS_IMMUTABLE_FL, ZFS_IMMUTABLE, XAT_IMMUTABLE,
xoap->xoa_immutable);
FLAG_CHANGE(FS_APPEND_FL, ZFS_APPENDONLY, XAT_APPENDONLY,
xoap->xoa_appendonly);
FLAG_CHANGE(FS_NODUMP_FL, ZFS_NODUMP, XAT_NODUMP,
xoap->xoa_nodump);
FLAG_CHANGE(ZFS_PROJINHERIT_FL, ZFS_PROJINHERIT, XAT_PROJINHERIT,
xoap->xoa_projinherit);
XVA_SET_REQ(xva, XAT_NODUMP);
if (ioctl_flags & FS_NODUMP_FL)
xoap->xoa_nodump = B_TRUE;
XVA_SET_REQ(xva, XAT_PROJINHERIT);
if (ioctl_flags & ZFS_PROJINHERIT_FL)
xoap->xoa_projinherit = B_TRUE;
#undef FLAG_CHANGE
return (0);
}
@@ -998,6 +1001,94 @@ zpl_ioctl_setxattr(struct file *filp, void __user *arg)
return (err);
}
/*
* Expose Additional File Level Attributes of ZFS.
*/
static int
zpl_ioctl_getdosflags(struct file *filp, void __user *arg)
{
struct inode *ip = file_inode(filp);
uint64_t dosflags = ITOZ(ip)->z_pflags;
dosflags &= ZFS_DOS_FL_USER_VISIBLE;
int err = copy_to_user(arg, &dosflags, sizeof (dosflags));
return (err);
}
static int
__zpl_ioctl_setdosflags(struct inode *ip, uint64_t ioctl_flags, xvattr_t *xva)
{
uint64_t zfs_flags = ITOZ(ip)->z_pflags;
xoptattr_t *xoap;
if (ioctl_flags & (~ZFS_DOS_FL_USER_VISIBLE))
return (-EOPNOTSUPP);
if ((fchange(ioctl_flags, zfs_flags, ZFS_IMMUTABLE, ZFS_IMMUTABLE) ||
fchange(ioctl_flags, zfs_flags, ZFS_APPENDONLY, ZFS_APPENDONLY)) &&
!capable(CAP_LINUX_IMMUTABLE))
return (-EPERM);
if (!zpl_inode_owner_or_capable(kcred->user_ns, ip))
return (-EACCES);
xva_init(xva);
xoap = xva_getxoptattr(xva);
#define FLAG_CHANGE(iflag, xflag, xfield) do { \
if (((ioctl_flags & (iflag)) && !(zfs_flags & (iflag))) || \
((zfs_flags & (iflag)) && !(ioctl_flags & (iflag)))) { \
XVA_SET_REQ(xva, (xflag)); \
(xfield) = ((ioctl_flags & (iflag)) != 0); \
} \
} while (0)
FLAG_CHANGE(ZFS_IMMUTABLE, XAT_IMMUTABLE, xoap->xoa_immutable);
FLAG_CHANGE(ZFS_APPENDONLY, XAT_APPENDONLY, xoap->xoa_appendonly);
FLAG_CHANGE(ZFS_NODUMP, XAT_NODUMP, xoap->xoa_nodump);
FLAG_CHANGE(ZFS_READONLY, XAT_READONLY, xoap->xoa_readonly);
FLAG_CHANGE(ZFS_HIDDEN, XAT_HIDDEN, xoap->xoa_hidden);
FLAG_CHANGE(ZFS_SYSTEM, XAT_SYSTEM, xoap->xoa_system);
FLAG_CHANGE(ZFS_ARCHIVE, XAT_ARCHIVE, xoap->xoa_archive);
FLAG_CHANGE(ZFS_NOUNLINK, XAT_NOUNLINK, xoap->xoa_nounlink);
FLAG_CHANGE(ZFS_REPARSE, XAT_REPARSE, xoap->xoa_reparse);
FLAG_CHANGE(ZFS_OFFLINE, XAT_OFFLINE, xoap->xoa_offline);
FLAG_CHANGE(ZFS_SPARSE, XAT_SPARSE, xoap->xoa_sparse);
#undef FLAG_CHANGE
return (0);
}
/*
* Set Additional File Level Attributes of ZFS.
*/
static int
zpl_ioctl_setdosflags(struct file *filp, void __user *arg)
{
struct inode *ip = file_inode(filp);
uint64_t dosflags;
cred_t *cr = CRED();
xvattr_t xva;
int err;
fstrans_cookie_t cookie;
if (copy_from_user(&dosflags, arg, sizeof (dosflags)))
return (-EFAULT);
err = __zpl_ioctl_setdosflags(ip, dosflags, &xva);
if (err)
return (err);
crhold(cr);
cookie = spl_fstrans_mark();
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr);
spl_fstrans_unmark(cookie);
crfree(cr);
return (err);
}
static long
zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
@@ -1012,6 +1103,10 @@ zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return (zpl_ioctl_getxattr(filp, (void *)arg));
case ZFS_IOC_FSSETXATTR:
return (zpl_ioctl_setxattr(filp, (void *)arg));
case ZFS_IOC_GETDOSFLAGS:
return (zpl_ioctl_getdosflags(filp, (void *)arg));
case ZFS_IOC_SETDOSFLAGS:
return (zpl_ioctl_setdosflags(filp, (void *)arg));
default:
return (-ENOTTY);
}